JP2001520602A - Improvements to automotive suspension systems - Google Patents

Abstract

(57) Abstract: A suspension system for a vehicle having a body (1) supported by at least one pair of laterally spaced front wheels and at least one pair of laterally spaced rear wheels. And suspension means for supporting a vehicle body on each pair of wheels, the suspension means providing substantially zero roll stiffness to the vehicle to support at least a portion of the load on the suspension system. The front and rear fluid support means (4, 5), the roll moment reaction means (8) for providing a substantially horizontal roll attitude at the position of the vehicle body, and the front and rear fluid support means. And a pitch control means (12) for coupling, wherein a change in fluid pressure in at least one of the fluid support means is controlled by the pitch control means. Those that are enabled transmission to the other of said fluid support means by means.

Description

DETAILED DESCRIPTION OF THE INVENTION Improvements to automotive suspension systems           The invention generally relates to automotive suspension systems. Yes, in detail, about the system incorporating the pitch control of the car It is.           The type of pitch control found in automotive suspension systems To control the pitch attitude of the car body when the car passes over bumps and uneven surfaces. It is preferred to improve control. For example, if a car is running on a road Or a sinusoidal road surface, especially large When passing on a road surface that extends slowly with amplitude, Trolls are preferred.           Applicant's co-pending International Patent Application No. PCT / AU97 / 00 In 870, some functionally related automotive suspension systems Is described. Each of the suspension systems described is actually Includes support means for supporting the vehicle body while providing qualitatively zero roll and warp stiffness In. Separate roll attitude control mechanism with negligible warp stiffness Gives the vehicle body roll control. The supporting means is provided for the above-mentioned application. It is in the form of a fluid actuator such as the airbag configuration shown in FIG. This The fluid actuator may also be in the form of a hydraulic ram.           The suspension system described is a pitch coupling mechanism In such a vehicle suspension system. This is advantageous in that the pitch control is performed to an appropriate degree.           Therefore, an object of the present invention is to control the pitch attitude of a vehicle. Suspension system of the type incorporating fluid support means including It is to provide.           With this in mind, the present invention provides at least a pair of laterally spaced With front wheels and at least one pair of rear wheels spaced laterally Suspension system for a vehicle, the suspension system comprising: Includes support means for supporting the body on each of said pairs of wheels, said support means comprising: Front and rear supporting at least part of the load on the suspension system Fluid support means, at least one of said vehicle support means being attached to the vehicle. On the other hand, to provide substantially zero roll stiffness,           Roll moment that allows the vehicle to assume a substantially horizontal roll position Reaction means, and           Pitch control interconnecting the front and rear fluid support means With means,           Wherein the fluid pressure in at least one of said fluid support means Can be transmitted to the other of the fluid supporting means by the pitch control means. What has become.           According to one preferred arrangement, said fluid support means each comprise a fluid In the form of a pair of laterally spaced fluid actuators containing a chamber. No. The fluid actuator may be, for example, an airbag or hydraulic ram structure. It is a good thing. Each fluid actuator has its own support member and vehicle It is connected between the vehicle body. The fluid communication means is a pair of laterally spaced apart The fluid chambers of the fluid actuator are interconnected. Fluid actuator for each pair The communication means for interconnecting the fluid actuators connects the fluid actuators, In the form of conduit means for allowing fluid to flow between them. The fluid actuator If is a hydraulic one, use a hydropneumatic accumulator And provided in fluid communication with said fluid conduit or manifold, with a variable Gives a degree of elasticity.           According to another preferred configuration, said fluid support means is spaced apart in said lateral direction. Single fluid access that is mechanically interconnected with a pair of spaced support members. It is in the form of a tutor. The fluid actuator is a single acting hydro. Rick ram, which can slide inside the outer body and this body. And the volume of the fluid chamber formed is It changes with the relative movement between the pad and the outer body. Also As an alternative, a piston is provided on the rod, and a piston is provided in the body. And a fluid chamber inside. You. A hydropneumatic accumulator is provided to apply elastic force to the support means. give. As an alternative, the fluid actuator may be a flexible bag Air bag structure having a fluid chamber according to the above. Each lever arm The lever arm extends substantially vertically and firmly from the support member, As the support member pivots, it is directed toward or into the vehicle chassis. Swing away from The piston of the fluid actuator has one Mechanically connected to the lever arm of the support member, and Is mechanically connected to the lever arm of the other laterally spaced support member are doing. The mechanical connection is provided by a pivot connection to one of the levers, respectively. It is in the form of a rod that extends from the ston and actuator body. like this The configuration is particularly effective when there are space restrictions below the car, which are partially , Each pair of laterally spaced wheels has only one fluid actuator. Because the height requirements of this configuration are relatively low.           The pitch control means comprises front and rear fluid support means and a fluid Includes pitch controller in communication. The fluid supporting means comprises a pair of fluids; An actuator, the fluid actuators being interconnected by fluid communication means. In the configuration connected to the above, the pitch control means is preferably Fluid communication with both fluid chambers of said fluid actuator via said fluid communication means; are doing. Wherein said fluid support means for at least one end of the vehicle is laterally A single fluid interface mechanically interconnected with spaced support members In a configuration including a actuator, the pitch control means includes It is in direct fluid communication with the fluid chamber of the glue fluid actuator.           The pitch controller includes at least a pair of fluid chambers, Each chamber is in fluid communication with one of the fluid support means, respectively. Pressure transmission Means for providing a fluid pressure in one fluid chamber of the pair of fluid chambers To the other fluid chamber of the fluid chamber in the pitch controller Tell           According to one preferred configuration, the pitch controller comprises a pair of streams. Body containers, each container being in fluid communication with a respective front and rear fluid support means. You. The fluid container is a flexible fluid reservoir contained in the housing in a serial arrangement. It is in the form of a bag. A free piston is provided between each of the fluid bags. is there. Elastic means are located substantially in the center of the free piston within the housing. Place. A typical example of the elastic means is in the form of a coil spring. Springs on both sides of the free piston provide pitch support and rigidity. I can.           The pitch controller housing is supported by the vehicle chassis. To disperse the force applied to the pitch controller to the vehicle chassis. Has become. Alternatively, the force may be applied to the housing or subframe. Such separate structures may be dispersed. The pitch controller is also The cylinder may consist of two main The main chamber is divided into two chambers by a movable piston. It is further divided into minor chambers. Each movable piston is a pis They are interconnected by rods that form a ton assembly. Reciprocal to each other Two of the example minor chambers are system chambers, one at the front, The other is connected to the rear support means. The other two minor chambers Pump chamber is a pressurized fluid (air or hydronew Such as hydraulic fluid moving into a mastic accumulator) or machine Mechanical springs (like coil springs or Belleville washers) To provide pitch support and rigidity. Some other functionally equivalent embodiments Is also possible.           Hydro to all four minor chambers of the pitch controller The fluid in one of the bump chambers is related It is adjusted according to the static pressure in the system chamber. As a result, the load on the car An associated variable pitch stiffness is provided. Of the fluid in the other bump chamber The volume is provided with an additional valve on the support arrangement provided for the bounce support means. It is adjusted by supplying or discharging fluid using a valve.           According to another configuration, the pitch controller comprises a flexible die. Includes a housing divided into two chambers by an afram. The elastic means is Provided on both sides of the flexible diaphragm, on both sides of the diaphragm When the pressures are substantially equal, the diaphragm moves substantially within the housing. In the center.           Providing a valve means between the pitch controller and the fluid supporting means; Control the flow of fluid. The fluid support means is connected by a fluid communication means. In a preferred configuration including a pair of fluid accumulators, the fluid communication The step controls the flow of fluid between said associated pair of fluid accumulators. Also includes valve means for performing. The valve means is connected to each fluid accumulator and the pitch controller. In the form of a separate valve that controls the flow of fluid to and from the controller is there. Otherwise, the valve means is in the form of a single three-way valve.           The pitch controller is adapted to change the pressure of the fluid in one of the fluid supporting means. To the other fluid support means. For example, a car is driving on the road In, when the front wheel of the car hits the speed hump, both wheels It moves upward at the same time. This results in a front actuator or a pair of fluid actuators. Data is compressed and the fluid pressure inside them increases. This increase in fluid pressure To the pitch controller, and then the increase in fluid pressure from the rear activator Or a pair of fluid actuators. As a result, the rear wheel moves downward Suppress the pitch of the vehicle when the vehicle passes through the speed hump.           However, said fluid actuator or actuators and Valve means for controlling the flow of fluid between the It is possible to finely control the pitch response. For example, after Close the valve means to the front actuator or rear actuators. The fluid flow to the rear actuator or rear actuators. Can be delayed. Therefore, the timing of the downward movement of the rear wheel is Controls fluid flow to the actuator or multiple actuators behind Can be controlled by a valve means. Automotive suspension system The response is better when the car is moving than when the car is moving relatively fast. It is better to respond more slowly when moving slowly No. With the above configuration, in these situations, the vehicle suspension The pitch response of the system can be slowed down. Therefore In this configuration, the pitch response is controlled using the vehicle speed as a function. Can be controlled. Alternatively or additionally, the valve means may be used to control the speed of the wheels. Multi-stage or variable limits depending on the degree and / or fluid velocity through the system. Buffer the pitch motion of the vehicle.           The increased fluid pressure also closes the valve means to the pitch controller It can be held in the pitch controller by twisting. Before Release of the fluid from the pitch controller opens the valve means, thereby Be able to change the car's pitch attitude at any time Can be controlled by This is achieved, for example, by using the valve During pressurization, the pressurized fluid is captured and the pressurized fluid is Efficiently buffer pitch motion by releasing fluid out of phase Can be used to Elastic due to the pitch motion of the wheel relative to the body Fluctuations in fluid pressure generated by a dynamically deflecting suspension system Can be stored and then used to react to such pitch motions Is done.           In order to detect the pitch motion of the vehicle body, the distance between the two longitudinal directions A vertical accelerometer can be used. Separately, the aforementioned international patent was issued. Also detects roll motion as described in PCT / AU97 / 00870 If so, pitch is a long vertical acceleration that is two vertically spaced Sensed through an accelerometer, the accelerometer being vertically spaced It has an arrangement similar to. Three vertical accelerations at three corners of the car It is possible to sense the roll and pitch by replacing with a total. Additional accelerometer and car The wheel position input is used to distinguish different types of pitch, and the controller In addition, by appropriate means, for example, the eddy on the pitch due to changing road inputs Be able to respond to dullness and subsidence.           No need for accelerometer, most to control squat and subsidence In a simple form, using the throttle switch and the brake switch, Passive on line to pitch controller to buffer other pitch motions A pitch controller that controls crouching and subsidence together with a bumper Close valve in line. In this case, for example, during braking, two Mode is provided. In the first mode, the rear of the car is pushed up (jacked). The conduit between the rear support means and the pitch controller should be closed to limit Will be blocked. In a pneumatic system, this means that the front support means Leave the spring rate softer than desired and in the second mode In addition, it is desirable to limit the sinking caused by the brake, where the front support means The conduit between the and the pitch controller is also closed. Similarly, acceleration There are two modes of squat control. An example For example, a pressure transducer that senses the pressure of the fluid in the front and rear support means A sensor can be used instead of or in addition to the pitch sensitive accelerometer.           The pitch controller takes into account, for example, the use of a typical car. To achieve the best bias for the type of ground on which the car normally travels. Thus, it can be adapted to the type of car.           Use even more physical features to properly set the valve response time Pitch damping, or by changing the limits imposed by the valve. You can change the ring. These features include, for example, car wheelbases, Its center of gravity and, if pressure transducers are provided, its payload Even it is included. The control system consists of component weight and tire According to the physical characteristics of the unspring part of the car, such as rigidity, Vibration of the wheel assembly at the natural frequency can be reduced. Said Developing the sensing system, the unenergized mass for a known natural frequency Analyze the frequency of vibration and the valves that are operating, such as "wheel hop" The effect can be reduced. Similarly, the vibration of the entire vehicle is analyzed and Wear.           The pitch attitude control is sensed by the control system. Driver-operated switches, such as known or ride height selectors Can be modified according to the mode of use selected by the switch.           The present invention has several advantages, including:           1.   Compromising on car roll control and handling Without increasing the pitch elasticity of the car;           2.   Large-amplitude pitch motion without compromising ride comfort Can buffer;           3.   Cross axle articulation of multiple wheels of a car The pitch attitude of the car without affecting the vehicle; and           4.   The pitch moment generated by the front wheel moved by the bump is the front wheel Counter by front-to-rear coupling that transmits changes in force applied to the rear wheels The pitch moment can be canceled.           This invention will now be described with reference to the accompanying drawings, which illustrate possible configurations of the invention. It is convenient to further describe the description. Other configurations of the invention are possible, Therefore, the particulars of the accompanying drawings should be understood as an alternative to the general description of the foregoing description of the invention. Not something to be done.           FIG. 1 shows a first preferred embodiment of a vehicle suspension system according to the invention. FIG.           FIG. 2 shows a second preferred embodiment of the vehicle suspension system according to the invention. FIG.           FIG. 3 is a sectional view of a second pitch controller;           FIG. 4 shows a third preferred embodiment of the vehicle suspension system according to the invention. FIG.           FIG. 5 is a sectional view of a third pitch controller; and           FIG. 6 shows a fluid for a vehicle suspension system according to the invention. 4 is a schematic view of a fourth preferred configuration of the support means.           Referring first to FIG. 1, there is a pair of laterally spaced sections. Front support member 2 and a pair of laterally spaced rear support members 3 are shown. These are hinged on both sides of the vehicle chassis 1. Automatic Only the support members 2, 3 on the left side of the car chassis 1 are clearly visible in FIG. It has become. A plurality of wheels (not shown) can be supported by the support members 2 and 3. It has become so.           The vehicle suspension system includes a front fluid support means 4 and A rear fluid support means is included. In FIG. 1, air is supplied to each of the fluid supporting means 4 and 5. A pair of fluid actuators 6 in the form of a bag and a pair of laterally spaced fluid actuators 6 Fluid actuators 6 interconnecting the fluid actuators 6. Each fluid actuator The fluid 6 includes a fluid chamber (not shown), and the fluid conduit 7 has a fluid activator. The fluid communication between the fluid chambers of the heater 6 is provided.           Vehicle suspension systems also include a roll control system. Configuration 8 is provided. This roll control configuration consists of a pair of stabilizers Each double-acting hydraulic ram 10 includes a bar 9 and a double-acting hydraulic ram 10. Fluid chambers are in fluid communication by a pair of secondary fluid conduits 11. The operation of the roll control arrangement 8 depends on the applicant's concurrently filed International Patent Application No. PCT / AU. 97/00870, the details of which are incorporated herein by reference. Previous Other freeware as detailed in the aforementioned PCT / AU97 / 00870 A roll and roll control configuration can be used instead.           Similarly, separate individual support means for providing roll stiffness are disclosed in the aforementioned International Patent. Combination with fluid support means having substantially zero roll stiffness as described in the application You can use it. For example, coil springs can be used to control airbags (or other fluid support Means).           The vehicle suspension system according to the present invention has a pitch control Means 12 are included. In the configuration shown in FIG. 1, the pitch control means 12 Pitch controller 13 with front fluid bag 14 and rear fluid bag 15 including. The front fluid bag 14 is in fluid communication with the front fluid support means 4, This communication interconnects the front fluid bag 14 and the front fluid actuator 6. The front conduit 16 allows fluid to flow between the fluid conduit 7 and the fluid conduit 7. Rear stream The body bag 15 is likewise connected to the fluid conduit 7 of the rear fluid support means 5 by a rear conduit. 17 and is in fluid communication with the fluid support means 5 at the rear. Free piston 18 It is interposed between the front fluid bag 14 and the rear fluid bag 15. Coils The springs 19 are provided on both sides of the free piston 18, and the free piston 1 is provided. 8 is substantially centered. The pitch controller 12 is The force exerted on the pitch controller 12 supported by the chassis by the Distributed to the vehicle chassis 1.           A valve means is also provided for connecting to and from the pitch controller 12. The fluid flow between the fluid actuator 6 and the fluid actuator 6 is controlled. The The valve means is of the type shown in the figure for the fluid support means at the rear. Rear conduit connecting the switch controller 12 to the fluid conduit 7 of the rear fluid support means 5 17 includes a valve 21. This valve 21 is a pitch control And the fluid from the pitch controller 13 to the fluid supporting means 5 Control the flow of Another valve 22 communicates with each fluid actuator 8 A plurality of fluid activators are provided between the tube 7 and the pitch controller conduit 17. Between the fluid controllers 6 and between the plurality of fluid actuators 6 and the pitch controller 12 Control the flow of fluid. These valves have fixed limits, multistage And a variable limiting and / or lockout valve, which The pitch movement of the pension system is buffered or controlled.           Alternatively, as shown for the fluid support means 4 at the front, the valve means To the front conduit 16 of the pitch controller means 12 and the fluid It may be in the form of a three-way valve 23 interposed between the pipe 7.           FIG. 2 shows an alternative configuration of the vehicle suspension system according to the invention. The components corresponding to the components shown in the automobile suspension system in Fig. 1 The components are numbered the same for simplicity. The main difference is the fluid The actuator is in the form of a hydraulic ram, and the pitch controller 13 Here, a flexible diaphragm (not shown) is used to connect the front and rear chambers. In that it is in the form of a wrapped housing 25 divided into is there. The front chamber is in fluid communication with the front fluid support means 4 by a front conduit 16. The rear chamber is in fluid communication with the rear fluid support means 5 by a rear conduit 17. are doing. The elasticity of the front and rear fluid support means is hypopneumatic. Provided by accumulator 24. Only one accumulator for each fluid support means Although only the data is shown, it is desirable to provide more. For example A heavy dumped accumulator is provided near each actuator. An under-dump at the center of the lateral conduit, which is locked off during the maneuver It is desirable to provide an accumulator that has been used. Separately, two accumles Data at the center of each conduit and lock off one of these as needed.           FIG. 3 is a cross section of the housing of the pitch controller shown in FIG. . Fluid from the front and rear support means is passed by the flexible diaphragm 26. The diaphragm is urged by springs 27 and 28 and It is located in the center of the group. The springs 27 and 28 generate elastic force in the pitch direction. Control and maintain the vehicle's level position in the pitch direction.           FIG. 4 shows a variant of the vehicle suspension system of FIG. A cylinder head 30 and a pipe for partitioning a fluid chamber (not shown) therein. A single hydraulic ram having a barrel 31 wrapping a ston (not shown) A rear fluid support means 5 replaced by 29 is provided. Rear support member Each of the three further includes a lever arm 32 extending from the support member 3. As a result of the support member 3 pivoting, the lever arm 32 is moved to the vehicle chassis 1. Sideways or away from the chassis. The piston rod 33 is the piston And the piston rod 33 is connected to one lever arm 3 of the support member 3. 2 is hinged. Another rod 34 is the head 3 of the hydraulic ram 29 0, this other rod 34 comprises opposite laterally spaced support members. -3 is hinged to the lever arm 32. Therefore, pin joint 3 5 between the piston rod 33 and the associated lever arm 32 and another rod 3 4 can be provided between the lever arms 32 associated therewith. As can be seen from FIG. In addition, the configuration of the rear fluid support means 5 is narrower than that of the front fluid support means 4. Pace available. Therefore, this configuration has a storage limitation in a car. This is advantageous when           An alternative pitch controller 37 is also shown in FIG. This pick A cross section of the h controller 37 is shown in FIG. Its operation is as shown in the diagram of FIG. Similar to that of a ram type pitch controller, with a free piston 38 has been replaced by the diaphragm. This piston is cylinder 3 9 and preferably includes a sealing arrangement (not shown), Fluid transmission from the body support means to the rear fluid support means is substantially prevented.           FIG. 6 schematically shows another possible form of pitch controller. The controller incorporates hydropneumatic pitch elasticity, for example For example, to further control the pitch stiffness of a vehicle that changes with load Has become. The fluid actuator 6 is a hydraulic cylinder, as shown in FIG. Are interconnected laterally by a fluid conduit 7, as in FIG. In Figure 2 As such, the actuator is the only form of bounce support for the car body Or in series or, more preferably, independently of each wheel Used in parallel with the supporting means (providing some degree of roll stiffness). Similarly c Hydro-pneumatic accumulator 24 has elastic front and rear fluid support means. Empower. The number, location and controls of these accumulators are shown in FIG. It is as stated.           The pitch controller is interposed between the front and rear fluid support means. , Conduits 18 and 17 in fluid communication therewith. Valve block 3 0 is located between the pitch controller and one of the front or rear fluid support means. ing. The valve block is equipped with a fixed limit multi-stage damper, a variable limit and / or Includes a lockout valve, damping the pitch movement of the suspension system Or controlled.           The pitch controller has a major channel aligned in two axial directions. And two pistons 46, 47 each having two It is divided into inner chambers 42, 43 and 44, 45. These pistons Are interconnected by rods forming a piston assembly. Previous Note that the movement of the piston assembly changes the volume in opposite relations. The minor chamber is a system chamber and includes front and rear fluid support means. In fluid communication with each. For example, they are 42 and 43 or 43 and 6, which are shown as 42 and 45 in FIG. Chan Bar 42 is a front system chamber, and 45 is a rear system chamber. is there. The remaining two minor chambers are connected to the accumulator 5 by conduits 48 and 49. 0,51, which allows movement of the piston assembly Gives the elasticity to the center in the pitch controller in a static state. Stay assembly. Chamber 43 (the front bump chamber) is in front of the car. When the loop hits the bump, it is compressed and the elastic force of the associated accumulator 50 reduces the force. Decide whether to tell the rear. Similarly, chamber 44 is a rear bump chamber. is there. Valve 30 is located in both conduits 48, 49 instead of conduits 16 or 17. You.           When the piston assembly is in the center, The relative volume of the chamber is determined by the position of the system and the bump chamber. The diameter of the piston rod and the two minorities independent of each other. It is changed by changing the diameter of the bore of the chamber.           In order to compensate for at least part of the load on the vehicle, the bump chuck The pressure at one of the members to the internal pressure of at least one of said fluid support means. Let it. For example, the rear bump chamber 44 and the rear system chamber 45 There is a very slow bleed orifice in between, which allows As the load increases, the internal pressure of the rear bump chamber increases. The pis The ton assembly is electrically or mechanically controlled using the other bump. The center position is maintained by adjusting the pressure of the fluid in the chamber. example For example, a spool valve (which is a part of the chamber) And an integral part) to drive the desired bump chamber through the pressurized Communicate with body source or fluid drain. This communication is based on the suspension system To avoid significant changes in fluid during normal dynamic operation of Limited to only.           While the vehicle's suspension system is operating, the fluid Between the fluid support means 4 and the pitch controller 13 and at the rear of the fluid support means 5; It flows between the pitch controller 13. The pitch controller 13 is a fluid support A change in the pressure of the fluid in one of the means 4,5 is transmitted to the other of the fluid support means 4,5. Act like so. Therefore, this configuration provides an improved pitch controller for vehicles. Give a troll.

[Procedure of Amendment] Article 184-8, Paragraph 1 of the Patent Act [Date of Submission] December 22, 1998 (December 22, 1998) [Details of Amendment] Claims 1. A suspension system for a motor vehicle having at least one pair of laterally spaced front wheels and at least one pair of laterally spaced rear wheels, comprising: on each said pair of wheels A suspension system for supporting a vehicle body, the suspension system including front and rear fluid support means for supporting at least a portion of a load applied to the suspension system, wherein at least one of the fluid support means is mounted to a vehicle. Roll moment reaction means for imparting substantially zero roll stiffness and having a substantially horizontal roll attitude at the position of the vehicle body, and pitch control means for interconnecting the front and rear fluid support means Wherein a change in fluid pressure in at least one of the fluid supporting means corresponds to the pitch Those enabled transmission to the other of said fluid support means by trawl means. 2. A pitch controller having at least a pair of fluid chambers in which the pitch control means is supported by the vehicle body and each fluid chamber is in fluid communication with one of the fluid support means; A pressure transmitting means for communicating to the other of said fluid chambers. 3. Each fluid chamber is provided at one end with a flexible fluid container mounted on the vehicle body by mounting means, the pressure transmitting means including a free piston, the piston being disposed between said fluid containers and facing each other. Suspension according to claim 2, supported by elastic means on the side, said elastic means keeping said free piston at least substantially centrally between said mounting means when the vehicle is in a rest position. system. 4. The pitch controller includes a housing divided into the two fluid chambers by a flexible diaphragm located therein, and elastic means are provided on opposite sides of the diaphragm, and the housing is provided when the vehicle is stationary. 3. A suspension system according to claim 2, wherein the diaphragm is located at least substantially centrally within. 10. 10. The suspension system according to claim 9, wherein said pitch controller is in fluid communication with conduit means of said fluid support means. 11. The suspension system according to claim 10, further comprising valve means for controlling fluid flow between said pitch controller and conduit means. 12. A suspension system according to claim 10 or 11, further comprising valve means for controlling the flow of fluid through the conduit. 13. At least one of the fluid support means includes a single-acting fluid actuator mechanically coupled to the pair of laterally spaced support members, wherein movement of the one support member is controlled by movement of the support member. A suspension system according to any one of the preceding claims, adapted to be transmitted to the other. 14． 14. The suspension system according to claim 13, wherein said pitch controller is in fluid communication with a fluid chamber of said fluid accumulator. 15. 15. The suspension system according to claim 14, further comprising valve means for controlling fluid flow between the pitch controller and the fluid actuator.

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Claims (1)

[Claims] 1. Laterally spaced with at least one pair of laterally spaced front wheels Suspension system for a motor vehicle having at least one pair of rear wheels And include the following           A suspension system for supporting the vehicle body on each pair of wheels, The suspension system should reduce the load on the suspension system. Also including front and rear fluid support means for supporting a portion thereof, said vehicle support means At least one of them provides the vehicle with substantially zero roll stiffness. ,           Roll moment that allows the vehicle to assume a substantially horizontal roll position Reaction means, and           Pitch control interconnecting the front and rear fluid support means Wherein the change in fluid pressure in at least one of said fluid support means is pre-existing. The pitch control means enables transmission to the other of the fluid support means. Things. 2. The pitch control means is supported on the body of an automobile, and each fluid channel is At least one pair of fluid chambers in which the chamber is in fluid communication with one of the fluid support means. A pitch controller having a valve, and a pressure controller for detecting a change in the pressure of the fluid in the fluid chamber. And a pressure transmitting means for communicating to the fluid chamber. System. 3. One end of each fluid chamber is attached to the car body at one end A flexible fluid container is installed, and the pressure transmission means is The piston is located between the fluid containers and on the opposite side When the vehicle is in a resting position by the elastic means The free piston is maintained at least substantially at the center between the mounting means. A suspension system according to claim 2, wherein 4. The pitch controller is a flexible die located inside the pitch controller. A housing divided by the afram into the two fluid chambers; When the vehicle is stationary when elastic means are provided on the opposite side of the ear ram Positioning the diaphragm at least substantially centrally within the housing. A suspension system according to claim 2, wherein 5. The pitch controller operates the two fluid channels by a free piston. A resilient hand on the opposite side of the diaphragm. Steps are provided so that when the vehicle is stationary, the free pipe 3. According to claim 2, wherein the ston is arranged at least substantially centrally. Suspension system. 6. The pitch controller is connected to the two fluid chambers by a dividing wall. Including a separate housing, with a movable piston located in each fluid chamber The fluid chamber is divided into two minor chambers, and the two minor chambers , Connected to said fluid support means, said pistons being tightly connected and moving together The suspension system according to claim 2, wherein 7. Elastic means are provided in the other two minor chambers, A suspension system according to claim 6, adapted to provide support and pitch stiffness. Tem. 8. Accumulator means in fluid communication with each of the fluid chambers. A suspension system according to claim 8, comprising: 9. Each wheel is supported on a vehicle body by a support member, and the fluid support At least one of the means is a pair of laterally spaced, single acting fluid activators. Means for providing fluid communication between the fluid actuator and the fluid actuator. Claim: The actuator is located between the support member and the vehicle body. Suspension system by any one of: 10. The pitch controller is in fluid communication with the conduit means of the fluid support means. The suspension system according to claim 9, wherein 11. Controlling the flow of fluid between the pitch controller and the conduit means 11. The suspension system according to claim 10, further comprising a valve means for adjusting.