ALL SHOCKS ABSORBED CV DAMPER TECHNOLOGY Contents 2 ALL SHOCKS ABSORBED – CV DAMPER TECHNOLOGY FROM ZF page4 PRODUCT RANGE FOR AXLE DAMPING page PCV® – PREMIUM COMFORT VALVE page8 N-DAMPER FOR TRUCKS page 10 N-DAMPER FOR BUSES page11 VARIO DAMPER page12 LDM – AIR SPRING DAMPER MODULE page13 CDC® – CONTINUOUS DAMPING CONTROL FOR AXLES page14 6 PRODUCT RANGE FOR CABIN DAMPING page18 STEEL SPRING MODULE page20 AIR SPRING MODULE page21 CALM® – CABIN AIR LEVELING MODULE page22 CDC® – FOR THE COMMERCIAL VEHICLE CABIN page23 INTELLIGENT LIGHTWEIGHT DESIGN page24 EVERYTHING IN SIGHT: ZF OVERALL EXPERTISE FOR COMMERCIAL VEHICLES page26 Reliable and innovative. Commercial vehicle manufacturers worldwide have relied on vibration damping solutions by ZF for more than 60 years. Our engineers are rising to tomorrow's challenges today. Technological megatrends like weight reduction, comfort improvements, and noise absorption drive the further development of damping technology and increase the efficiency of commercial vehicles. Be it a component, a module, or an entire system: ZF damping technology always provides significant benefits in comfort, driving stability, and safety. Thanks to intelligent, modular concepts ZF has become the leading specialist worldwide for vibration damping in trucks, buses, trailers, agricultural and construction machinery. 3 ALL SHOCKS ABSORBED – CV DAMPER TECHNOLOGY The demands placed on damping technology in modern commercial vehicles are high. Vehicle manufacturers and fleet owners throughout the world count on the reliability and quality of vibration damping components, modules, and systems from ZF. They guarantee maximum comfort, safety, and cost-effectiveness. FOR THE GLOBAL TRANSPORT OF PEOPLE AND GOODS OF THE FUTURE To bring people and goods safely, reliably, and Safety and comfort without compromises cost-effectively to their destinations worldwide, Shock absorbers must, on the one hand, support ZF is facing the challenges of the global commer- the functions necessary for driving safety, such cial vehicle market also in the area of damping as lateral guidance, braking, and acceleration. technology: On the other hand, they must also keep vibrations to a minimum to provide passengers with Managing complexity the expected level of comfort and to protect the Regardless of whether the chassis is meant for a vehicle and the cargo load. ZF valve and system truck, bus, tractor, or van, shock absorbers cannot technology guarantees optimal results for vehicle be considered in isolation. The various chassis handling, comfort, and safety – precisely tailored parameters mutually influence each other during to the requirements of our customers and their vehicle operation. Kinematics, elasticities, and vehicles. their interaction play a decisive role in vehicle handling alongside springs, spring-loaded stops, Reliability and flexibility – worldwide shock absorbers, and stabilizers. The modular shock absorber kit used worldwide, in conjunction with the ZF production and logis- ZF chassis engineers manage these complex tics system, ensures flexibility and reliability in correlations in the vehicle and precisely know supply. Our customers can rely on that – world- the significance of the shock absorber within the wide, day after day, millions of times over. system. Their expertise guarantees outstanding results for our customers. 4 5 PRODUCT RANGE Axle Damping N-DAMPER for trucks and buses Vibration damping in the vehicle PCV® – Premium Comfort Valve The depicted vibration characteristics show how a shock absorber reduces the vibrations caused by uneven roads (orange curve: undamped; blue curve: damped). 1 1 Cabin 2 Chassis 3 Axle 1 2 3 N-damper for medium and heavy-duty commercial vehicles N-damper for buses LDM – AIR SPRING DAMPER MODULE PCV® technology for a new feeling of comfort The primary suspension absorbs excitations originating from the road. The suspension enables the wheel to follow the unevenness of the road. However, the stored energy is released again by the suspension system when the wheel is rebounding. The chassis needs shock absorbers to dampen vibrations caused by this as quickly as possible. Sprung and unsprung masses vibrate in different frequency ranges. Shock absorbers aligned with vehicle suspension basically prevent the body from rocking and vibrating. They ensure permanent road grip of the wheels and thus good lateral guidance and braking effects. Damping plays a decisive role in driving safety and ride comfort. CDC® – CONTINUOUS DAMPING CONTROL DAMPER SIZES Vehicle category Light commercial vehicles Special applications Light trucks Medium and and heavy-duty trucks and buses Damper sizes S27(1) S30(1) N30 N36 N45 N50 T70(2) Rebound [N] 3,500 4,500 6,000 11,000 16,000 20,000 30,000 Compression [N] 1,500 1,500 1,800 3,500 6,000 10,000 20,000 Maximum permissible nominal damping power with a piston speed of 0.52 m/s (1) Standard shock absorbers for light commercial vehicles and light trucks (2) Standard shock absorbers for special applications The selection of the ideal damper size depends on the forces acting on the damper and the entire suspension system as they determine the required damping forces. In addition, the Is applied in innovative suspension concepts for heavy trucks and buses. 6 length and diameter define the heat dissipating surface area. The larger the shock absorber, the larger is the surface area and the higher is the thermal load capability. The electronically controlled CDC® damping system ensures perfect damping of the vehicle in every situation. 7 PCV ® PCV® allows for a new feeling of comfort by means of an even more variable valve characteristic. Premium Comfort Valve – PCV® When stability simply feels good. The PCV® technology opens up new possibilities for conventional shock absorbers and allows for significantly higher comfort without compromising stability. At medium velocities, the PCV® low compression speeds and from a the oil flow between rod guide and with modified oil feed system very harmonic transition to the next piston. The bypasses thus created provides a moderate increase in force levels that are needed at higher control the oil flow to the bleeder the damping force. The slope of speeds. valve, pre-valve, or main valve. In the damper characteristic is flatter, conjunction with various springs, which is perceived as a softer, more Smooth flow valves and orifices, this results in comfortable suspension response. The PCV® can lay claim to yet an- numerous additional possibilities To keep the vehicle uniformly stable other plus with regard to ride comfort: for the shock absorber setting. As a and to prevent the vehicle body Thanks to the new valve geometry, result, the damper characteristic can from rocking and vibrating, the the oil flow is smooth and calm in be even more precisely defined to damping force increases again comparison to traditional twin-tube match customer requirements and with PCV® at higher piston speeds. dampers. This allows ZF to minimize the vehicle’s field of application. High speed generate high damp- the hydraulic flow noises and the ing forces via fluid friction, thus transmission of non-damper noises A significant increase in damping contributing to increased safety in to adjacent components. force at low damper velocities re- vehicle operation. duces rolling and pitching motions 8 to a minimum. This increases the The new sense of comfort provided safety of drivers and passengers by PCV® results from the robust during braking and acceleration. damping of the axle movements at low Damping force F [N] The heart of the PCV® technology is medium high 10,000 8,000 6,000 4,000 Characteristic curve of conventional shock absorbers 2,000 Characteristic curve of the PCV 0 -2,000 0 0.13 0.26 0.52 0.39 Speed V [m/s] HIGHLIGHTS Improved comfort More precise adjustment of the damper characteristics No external control systems Significant minimization of the noise situation in the vehicle Available for mechanical and air springs Independent of ride height Outstanding cost/performance ratio 9 N-DAMPER FOR TRUCKS N-Damper for Buses The N-damper was specially developed for modern ZF has optimized the established N-damper generation air and parabolic springs. It has proven itself in longdistance trucks and under extreme conditions in heavy terrain. N-dampers by ZF operate on a twin-tube principle. ADVANTAGES Long service life Great tire comfort Low friction Multi-stage piston and base valves Perfect for modern air suspension concepts especially for bus applications. New piston and base valve concepts take into account the special resonance properties of buses, significantly minimizing the transmission of noise. Combined with newly developed comfort joints, passengers enjoy ideal drivability and When the suspension is compressed, the piston rod maximum noise isolation. Adjusting the correct ride moves in (compression stage). This pushes a quantity height is facilitated by the well-proven knurling of ZF of oil corresponding to the volume of the piston rod dampers. The new heavy-duty lower stud offers high through the damper base valve into the outer tube. load-carrying capacity and long service life, especially At the same time, the annular volume of oil is pushed on difficult roads. ADVANTAGES Minimized noise transmission Optimized piston and bottom valves Mounts optimized for comfort Increased service life Reinforced bottom stem mounts Zinc-nickel coated joint parts Knurling to ensure correct ride height Further increase in comfort through VARIO technology from the lower into the upper working chamber through the piston valve. Thanks to a high-quality zinc-nickel coating, the metallic surfaces have an exceptionally long service life. That When the axle load is released, the piston rod extends way, they are protected against corrosion. In addition, (rebound). The annular volume flows back through they ensure the well-known long service life of ZF's N- the piston valve. A quantity of oil corresponding to dampers, even under extreme environmental conditions. Zinc-nickel coated joint kits the volume of the piston rod is sucked from the oil reservoir in the outer tube through the base valve. APPLICATION The N-damper is used in all truck and semitrailer applications. Seal and guide unit Hydraulic end stop Viton®-Seals for high temperature resistance and long service life Hydraulic end stop Viton®-Seals for high temperature resistance and long service life Piston rod DAMPING FORCE AND CHARACTERISTIC CURVES Pressure tube Oil reservoir Piston valve Progressive-linear characProgressiv-linearer Progressiv-linearer teristic curve development Kennlinienverlauf Kennlinienverlauf for leaf spring vehicles. Degressive of the Degressivercourse Kennlinienverlauf Degressiver Kennlinienverlauf characteristic curve: ideal for parabolic spring and pneumatic spring vehicles thanks to patented piston system. In general, the damping force of the shock absorber depends on the piston speed: The damping force increases with increasing piston speed. The valves define to which extent this happens. The special design, arrangement, and combination of the valves make it possible to achieve all desired damping characteristics (characteristic curves) that are required and ideal for the respective use. Wear-optimized contact surface pairing Knurling on the reservoir tube for easy adjustment and check of the ride height VARIO technology for comfortable traveling Noise-optimized piston valve Base valve One-piece, heavy-duty reservoir bottom with integrated joint pin Advanced base valve specifically for bus requirements The damping force characteristic is individually adjusted for each vehicle series. The characteristic is defined in close cooperation with the vehicle manufacturer. Thus, full driving stability is guaranteed even when the vehicle is fully loaded. 10 11 VARIO DAMPER – STROKE-DEPENDENT DAMPING LDM – AIR SPRING DAMPER MODULE Control grooves in the cylinder tube, which create The LDM air spring damper module is an alternative a hydraulic bypass, are used to implement strokedependent damping. The hydraulic bypass works on the piston valve. It is mechanically formed in the cylinder tube of the shock absorber. ADVANTAGES Enhanced comfort Economical Integration into standard shock absorbers possible Can replace existing shock absorbers No control elements needed The piston travels over the control groove depending on the shock absorber position and stroke. When oil flows over the groove, hydraulic resistance is reduced and therefore the damping force as well. The damping ADVANTAGES to the established concept of installing dampers and air springs next to one another in the suspension. It is a compact unit consisting of both an air spring and a damper. By reducing the number of individual components and APPLICATION VARIO technology is used primarily for cabin damping in trucks and on axle dampers in buses to improve comfort. It also has numerous applications in light commercial vehicles. saving installation space, the LDM significantly contributes to the new front axle requirements. This design is in a way similar to air spring damper modules for cabin forces are significantly higher outside the grooves – for suspension. They are ideally suited for the innovative even more driving safety. axle designs of the future. Improved anti-roll stability – especially important if body has high center of gravity With the respective axle kinematics, larger spring travels result, e.g. when swap trailers and semitrailers are attached Reduced installation space The combination of spring and shock absorber enables a wide spring track Sizing of the outside dimensions of the bellows and rolling piston make high axle loads possible LDM can be combined with the continuous damping control system, CDC® Careful design of the transition profile between the groove and the smooth part of the cylinder prevents Top connection with integrated air connection abrupt changes in vehicle damping. Integrated compression stop APPLICATION Air spring damper modules are used in trucks and buses for independent wheel suspensions and for conventional suspensions on the front axle. Additional air volume Support flange Electromagnetic CDC® control valve (optional) Bottom connection 12 13 CDC ® CDC® – Continuous Damping Control Perfect Damping Anytime CDC® is the damping control system for buses and commercial vehicles that combines uncompromising comfort and driving safety – from a single source, from ZF. The CDC® electronically controlled The feeling of comfort is higher and Usually that is the rear axle, since damping system permanently the driver can concentrate better on the largest axle load differences monitors all relevant influences on his task: driving the vehicle. occur there due to vehicle loading. The performance of the new CDC® the driving situation, such as load condition, driver activities, vehicle ZF develops CDC® as a system for control concept is already clearly movements, etc. The CDC® opti- commercial vehicles and delivers visible with this limited application. mally sets the damping force within significant advantages in compari- a few milliseconds. The vehicle son to previous solutions. This is To achieve optimal vehicle handling should receive as much damping as primarily thanks to the use of the for the overall vehicle, we continue needed in the given situation, but skyhook control principle. Both to recommend the full CDC® system basically as little as possible. It is ride comfort and driving stability which appropriately controls all no longer necessary to compromise are noticeably improved, especially shock absorbers. between safety and comfort with in partially loaded conditions. The the shock absorber setting. ZF system can be used both as a complete system and as the CDC1XL With CDC®, the vehicle remains single-axle solution. stable and safe to control in all situ- 14 ations. Damage to load, packaging, CDC1XL is a particularly efficient and vehicle are kept to a minimum. variant of the CDC®. The shock Driver and passengers experience absorbers on only one vehicle axle significantly reduced vibrations. are controlled and damped. FOR MORE INFORMATION: HIGHLIGHTS Stability even in critical driving situations Safe handling during dynamic driving maneuvers Comfort for driver and passengers Protection of cargo, packaging, and vehicle body Reduced vehicle wear Reduction in road damage Increase in cost-effectiveness THE CDC® MODULAR KIT – SOLUTIONS FOR A WIDE VARIETY OF REQUIREMENTS Full CDC® version CDC1XL Sensor systems CAN data and possibly separate sensor system Sensor cluster integrated in ECU A-CAN (if suitable) Control unit Independently by wheel Independently by axle Application For all trucks and buses, 18 wheels can be dampened independently Primarily rear suspension due to load differences www.zf.com/trucks FOR MORE INFORMATION: www.zf.com/buses 15 THE CDC® SYSTEM CDC1XL – THE SOLUTION FOR ONE AXLE CDC® is an intelligent control system composed of system sensors, control unit, and CDC® dampers. The CDC1XL is a cost-optimized variant of the CDC® damping system from ZF. Concentrating on one axle (with greatly varying load conditions) while adapting the controller concept clearly reduces system costs. At the same time, significant benefits are generated. The controller developed by ZF is decisive for the high performance of the CDC1XL. The sensors determine the current driving situation. CDC® uses the data of the sensor cluster integrated into the ECU as well as the information available on the CAN bus. An important component of the CDC® damper is an electronically controlled proportional valve. The oil flow rate is increased or decreased depending on the demand. The required valve position is permanently re-calculated and continuously adjusted. Conventional damping Controlled damping CDC1xl CONTROL LOOP (EXAMPLE) External influence (street, crosswind, etc.) The system can adjust the damping force in just a few milliseconds and can do so independently for each axle and wheel. The use of the skyhook principle makes the CDC® clearly noticeable. 1XL Brake pressure Driver hard Pedal position Speed CONTROLLED DAMPING CONTROLLED DAMPING soft Rebound Steering input STABILITY Load Air spring pressure Wheel speed front axle Damping force [N] Vehicle reaction CAN bus data 1 The CDC1XL uses the sensor cluster integrated into the controller to determine the relevant control variables itself. Thus, it can be easily integrated into existing vehicle concepts. Electromagnetically controlled proportional valve COMFORT ECU with integrated sensor cluster In addition to the load signal, steering input via the CAN bus can be used in order to increase the roll resistance of the vehicle during cornering. Piston speed [m/s] Damping force adjustment ranges ADVANTAGES WITH CDC® Safety Vehicle remains stable in terms of driving dynamics and is easy to keep under control even in challenging situations Greater safety and better handling in highly critical maneuvers: 1. Braking: Potentially shorter braking distances 2. Lane changes: Better control and handling due to lower roll angle 3. Steering: Smaller steering angle 4. Acceleration: Less pitching, better wheel control Cargo protection Less damage to cargo and packaging; cargo remains securely fixed on load floor 16 Vehicle wear Vehicle components are subject to less stress; maintenance costs decrease Ride comfort Reduced vehicle body and seat acceleration; CDC® lowers driver fatigue; passengers have a more pleasant trip Road protection Reduction in damage caused by dynamic loads Cost effectiveness Vehicle components are subject to less wear, maintenance costs decrease, less tire wear; potentially lower insurance premiums The data show, that CDC1XL uses the damping force range to the best benefit. Unloaded/partially loaded Fully loaded 9090 [dB] [dB] 1 The subjective improvement is verified by objective measurements. A frequency analysis shows objective improvements in the relevant frequencies. 9090 [dB] 1 [dB] Compression NOTICEABLE IMPROVEMENT with CDC1xl 8585 8585 8080 8080 7575 7575 7070 7070 6565 6565 6060 6060 Controlled CDC1XL Conventional shock absorbers 5555 5555 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 9 9 1010 [Hz][Hz] In unloaded and partially loaded vehicles, vibrations and motions are noticeably reduced – this means more comfort. 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 9 9 1010 [Hz][Hz] In a fully loaded vehicle, driving stability remains on the same level compared with conventional shock absorbers – at very good comfort. 17 PRODUCT RANGE Cabin Damping STEEL SPRING MODULE VIBRATION DAMPING for the driver's cab AIR SPRING MODULE The depicted vibration characteristics show how a shock absorber reduces the vibrations caused by uneven roads (orange curve: undamped; blue curve: damped). 1 2 1 Cabin 2 Chassis 3 Axle 1 2 3 Is used in all types of commercial vehicle cabins. Significantly increases ride comfort in trucks, tractors, and special vehicles. CALM® – CABIN AIR LEVELING MODULE CDC® – CONTINUOUS DAMPING CONTROL ZF cab dampers provide greater safety, comfort, and stability. Improved comfort levels reduce driver fatigue, increasing performance and thereby driving safety. Vehicle cabs differ in size, equipment, and weight depending on their application. Each different cabin design requires an individual spring/damper solution. Ride comfort in commercial vehicles is considerably enhanced by cabin suspension and cabin damping that is separate from the chassis. ZF offers a range of products from lateral dampers (nearly horizontal installation position), steel spring, and air spring modules to CALM® Cabin Air Leveling Modules and CDC® controlled damping. CUSTOMIZED SOLUTIONS FOR EVERY CABIN Regardless of the type, size, and equipment of the driver's cab, ZF offers the best solution for cabin damping and suspension. The range extends from medium and heavy trucks of all application categories through to off-road and agricultural machinery. Air spring module with integrated height leveling. No external components for height leveling are required. 18 The electronically controlled damping system CDC® provides the cabin with ideal damping in every situation. In particular, pitching motions are reduced significantly. 19 STEEL SPRING MODULE AIR SPRING MODULE The steel spring is mounted concentrically on the Pneumatic suspension allows for ride height control. damper. It is designed in various spring characteristics depending on the use case. The cabin level is independent of the system and is not controlled. It depends on the load. Different cabin weights require the steel spring suspension to have different load carrying ADVANTAGES Independent from other systems, such as air supply Outstanding cost/benefit ratio Small installation space required The robust design enables rough-terrain applications, e.g. for construction vehicles It compensates load differences resulting from different cabin weights/equipment and cabin movements while the vehicle is operated. As good ride comfort is based on low natural frequency, cabin suspensions – especially ADVANTAGES Ride height control with different cabin equipment/loading Constant, comfortable characteristic frequency Increased ride comfort Small installation space required in medium and heavy-duty vehicles – are equipped with pneumatic suspension. capacities to maintain ride height levels. This can be achieved by different spring rates, different preload, or a mechanical height adjustment known as spring mount Loads between 2,000 N and 4,000 N can be supported adjustment. with an internal pressure of 5 bar in the air spring bellow. A special air spring piston shape for the air spring yields low spring rates in mid stroke, but a very strong progression towards the end stops. Thus the driver cab remains APPLICATION stable at a high level of ride comfort. The steel spring module is used with all types of commercial vehicles with limited load differences. This includes primarily construction and delivery vehicles as well as tractors and special vehicles – precisely where robustness takes center stage. SPRING MOUNT ADJUSTMENT APPLICATION The air spring module is used for driver cabs with high comfort requirements and for trucks, tractors, construction vehicles, and special vehicles. Seal and guide unit Seal and guide unit Piston rod Piston rod STEEL SPRING Module AND AIR SPRING MODULE IN COMPARISON Piston valve The same spring damper modules can be used for different cabin weights by adjusting the spring mount. Coil spring Base valve Requirements Steel spring Air spring ■ ■ Typical natural frequency of the driver's cabin 1.8 - 3.0 Hz 1.0 - 1.4 Hz Low natural frequency at design height and progressive spring forces at the stroke end stops To a limited extent ■ ■ ■ Hydraulic damper or suspension strut with concentrically aligned spring element. Dampers with VARIO design with stroke-dependent characteristics possible Piston valve Tailored piston Base valve Horizontal dampers reduce the infamous "cabin shake" syndrome and thus increase safety and comfort. 20 21 CALM® – CABIN AIR LEVELING MODULE CDC®– FOR THE CABIN With CALM® (Cabin Air Leveling Module), ZF has de- CDC® eliminates the trade-off between comfort and As a result, cabin suspension is soft and comfortable. stability in the cabin. It solves the conflicting demands As soon as excitation of the cabin changes due to lane for higher suspension and damping comfort on the one changes, braking maneuvers, or gear shifts, CDC® keeps hand, and for good cabin stability while accelerating, the cabin stable by increasing damping forces. veloped a unique air spring damper module. This module contains the leveling system for the driver's cabin. CALM® appears very similar to conventional air spring modules. Height leveling is no longer controlled via an external valve but is directly implemented in CALM®. The module also replaces a number of additional ADVANTAGES Damping and air suspension with integrated height leveling Low susceptibility of the height leveling to external influences such as dirt and damage Modular design Smaller installation space required No adjusting during assembly Fewer individual components braking and cornering on the other. The system also contributes to fuel efficiency by enThe damping forces are adjusted to the optimum level abling shorter gear-shifting times and reducing tractive within milliseconds on the basis of data provided by the force interruption without compromising ride comfort, external components. Depending on the ride height, vehicle's sensors. At straight-ahead driving on average- e.g. due to stronger cabin pitch. the valve regulates the pressure in the air springs and quality roads, the electronics reduces damping forces. provides a constant ride height of the driver's cabin. CALM® has proven its worth under the toughest conditions – also in construction vehicles and tractors. Thus, the driver can rely on the advantages of an air suspended cab even with demanding applications. APPLICATION CALM® is used in all types of air spring cabins that require high comfort levels and are subject to a wide range of different load conditions. Areas of application include trucks, agricultural tractors, construction vehicles, and special vehicles. Piston rod Compression stop buffer Leveling valve CALM® SOLUTION 1 5 Piston 2 7 6 3 8 4 Minimum pressure valve CDC ® CONTROL LOOP (EXAMPLE) CDC® 1 3 5 2 4 6 1 2 3 4 Air line CALM® Air supply line Conventional air spring module 5 Air distributor 6 External level control valve 7 Linkage and adjusting mechanism 8 Air supply line Driving activity 22 External components for height leveling have largely been eliminated. hard Transmission control soft Control Speed y Steering angle x Nm X Brake pressure Engine torque z Cabin reaction 23 INTELLIGENT LIGHTWEIGHT DESIGN In developing new components and systems, ZF always strives for efficiency and resource conservation. This applies equally to products in the areas of axle and cabin suspension. Good reasons to lose weight The weight reduction in comparison to a corresponding The basic conditions are clear: Commercial vehicles volume production shock absorber of size N36 is about must lose weight in the future. Customers benefit from 40 % or 1.5kg. ADVANTAGES Resource conservation in production Fuel savings Increase in payload Greater comfort potential by reducing the unsprung masses Improvement in corrosion resistance Use of innovative materials and procedures from the ZF technology portfolio reduced curb weight with increased payloads. Weight reduction also helps to achieve the demanding targets Lightweight design for cabin damper modules for reduced fuel consumption. In addition, reducing Not only are alternative materials such as aluminum the weight of unsprung masses (axles, wheels, brakes, and fiber composites being used in cabin damper mod- shock absorbers, etc.) creates additional potential for ules; there is also a further integration of functions, for improving comfort. instance into the outer tube of the damper. This reduces complexity during assembly and allows for resource Lightweight design for axle dampers conservation during manufacturing. ZF lightweight axle dampers combine various materials and technologies from the existing ZF technology As with axle dampers, corrosion characteristics are also portfolio. Hollow piston rods, aluminum containers being significantly improved with cabin applications. – with reduced wall thicknesses in some case – and a redesigned plastic protective tube are used in the lightweight versions of dampers sizes N36 and N45. The intelligent combination of innovative materials and procedures allows for weight reductions of up to 40%. 24 25 Everything in Sight: ZF Overall Expertise for Commercial Vehicles ZF technology is the standard for commercial vehicles in all categories. Whether driveline or chassis technology, ZF has the entire vehicle in view as the systems supplier. Safe and reliable on the road: ZF technology for cost-effectiveness ZF driveline and chassis technology in modern and efficiency commercial vehicles ZF driveline and chassis technology is the first ZF technology in commercial vehicles draws choice for trucks and buses of all categories. upon a long volume-production experience and ZF components and systems have proven them- are consistently developed further. Thanks selves a million times over and set standards to its use, engine power is translated into real regarding cost-effectiveness, safety, and com- performance on the road. It develops its full fort. They preserve the chassis, driveline, and potential in perfectly harmonized interaction the body. They reduce stress on driver and the with ZF components for wheel suspension, vehicle, help preserve resources, and make an axle guidance, damping, and spring suspension intelligent and sustainable contribution to the as well as with complete ZF chassis systems. commercial vehicles' cost-effectiveness and They ensure safety and reliability in all driving efficiency. situations. Obtain technical details and experience Working better: ZF technology for comfort our products in action online at in commercial vehicles www.zf.com/trucks. Comfort in commercial vehicles does not mean extravagance. It supports the driver's concentration and improves his working conditions. At the same time, intelligent assistance systems ensure that drivers can rely on the performance MORE INFORMATION ON TRUCKS www.zf.com/trucks of their trucks in all driving situations. These are the prerequisites to ensure that driver, passengers, vehicle, and load are always safe on the road and arrive on time. 26 MORE INFORMATION ON BUSES www.zf.com/buses 27 twitter.com/zf_konzern facebook.com/zffriedrichshafen youtube.com/zffriedrichshafenag EN 0000 750 182 - 2014 ZF Friedrichshafen AG Ernst-Sachs-Straße 62 97424 Schweinfurt Germany Phone +49 9721 98-0 Fax +49 9721 98-2290 www.zf.com
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