Vehicle suspension system

Abstract

A vehicle suspension system according to the present invention comprises: a leaf spring; a locking member by which one end of the leaf spring is locked; and a holding member which holds the other end of the leaf spring. The holding member holds the other end of the leaf spring and has a roller that is rotatable so as to follow the displacement of the other end of the leaf spring and a pressing member that faces the roller. The other end of the leaf spring is provided between the roller and the pressing member. The roller and the pressing member are provided so as to allow the manner in which the roller and the pressing member contact the leaf spring to be changed.

Description

Vehicle Suspension Systems

[0001] The present invention relates to suspension systems for vehicles.

[0002] Conventionally, suspension systems have been known that are provided on vehicles and have a buffering function to prevent vibrations caused by road surface irregularities from being transmitted to the vehicle body via the wheels, thereby improving the vehicle's ride comfort, steering stability, etc. Among such suspension systems, leaf spring type suspension systems are configured using leaf springs (see, for example, Patent Document 1).

[0003] The leaf spring described in Patent Document 1 has one end fixed to the vehicle body and the other end slidably supported via a slide seat. A load from the axle or the like is applied to the center of the longitudinal direction of the leaf spring, and the leaf spring is deformed by this load.

[0004] Japanese Unexamined Patent Publication No. 169307 / 1983

[0005] However, when the end of the leaf spring is held by a slide sheet, as in Patent Document 1, durability can decrease due to wear caused by friction between the slide sheet and the leaf spring, and abnormal noise can occur due to friction during sliding.

[0006] The present invention has been made in consideration of the above, and aims to provide a vehicle suspension system that can suppress a decrease in durability due to friction between the leaf spring and the retaining member and the generation of abnormal noise.

[0007] In order to solve the above-mentioned problems and achieve the object, the vehicle suspension system of the present invention comprises a leaf spring, a locking member to which one end of the leaf spring is locked, and a holding member that holds the other end of the leaf spring, wherein the holding member holds the other end of the leaf spring and has a roller that holds the other end of the leaf spring and is rotatable in response to displacement of the other end of the leaf spring, and a pressing member that faces the roller, wherein the other end of the leaf spring is provided between the roller and the pressing member, and the roller and the pressing member are arranged so as to be able to change the contact state of the leaf spring between the roller and the pressing member.

[0008] In addition, in the vehicle suspension system according to the present invention, the other end of the leaf spring is sandwiched and held by the roller and the pressing member.

[0009] Furthermore, in the vehicle suspension system according to the present invention, the roller and the pressing member are movable while their relative positional relationship is fixed.

[0010] In addition, the vehicle suspension system according to the present invention is characterized in that, in the above invention, at least one of the roller and the pressing member is movable.

[0011] Furthermore, in the vehicle suspension system according to the present invention, the roller and / or the pressing member are movable in the approximately longitudinal direction of the vehicle.

[0012] Furthermore, in the vehicle suspension system according to the present invention, the roller and / or the pressing member are movable in a substantially vertical direction of the vehicle.

[0013] Moreover, the vehicle suspension system according to the present invention is characterized in that, in the above invention, it further comprises a control device that controls movement of the roller and / or the pressing member.

[0014] According to the present invention, it is possible to suppress a decrease in durability due to friction between the leaf spring and the retaining member, and to suppress the generation of abnormal noise.

[0015] Fig. 1 is a diagram showing the configuration of a portion of a vehicle including a suspension system according to a first embodiment of the present invention. Fig. 2 is a diagram for explaining the configuration of a leaf spring provided in the suspension device according to the first embodiment of the present invention. Fig. 3 is a flowchart for explaining the flow of control performed by a control device provided in the suspension system according to the first embodiment of the present invention. Fig. 4 is a diagram for explaining the operation of a roller in a suspension device according to a second embodiment of the present invention.

[0016] Hereinafter, embodiments for carrying out the present invention (hereinafter referred to as "embodiments") will be described with reference to the accompanying drawings. Note that the drawings are schematic, and the relationship between the thickness and width of each part, the thickness ratio of each part, etc. may differ from the actual ones, and the drawings may also include parts with different dimensional relationships and ratios.

[0017] 1 is a diagram showing the configuration of a portion of a vehicle including a suspension system according to Embodiment 1 of the present invention. The suspension system 10 shown in FIG. 1 includes a suspension device 1 and a control device 200 that controls the suspension device 1.

[0018] The suspension system 1 is mounted on the body of a vehicle and supports an axle 100 that supports a wheel 101. In Fig. 1, the left side is the front of the vehicle and the right side is the rear. The suspension system 1 includes a leaf spring 2, a locking member 3 to which one end of the leaf spring 2 is locked, and a holding member 4 that holds the other end of the leaf spring 2 so that it can move back and forth.

[0019] The locking member 3 and the holding member 4 are attached to the frame 110. Specifically, the locking member 3 is provided on a front mounting portion 120 that is fixed to the frame 110. The holding member 4 is provided on a rear mounting portion 130 that is fixed to the frame 110. The front mounting portion 120 and the rear mounting portion 130 are fixed to the frame 110 with fastening members such as screws. The locking member 3 is attached to the front mounting portion 120 by welding or the like. The holding member 4 is attached to the rear mounting portion 130 by welding or the like. The locking member 3 and the holding member 4 may be formed integrally with the front mounting portion 120 and the rear mounting portion 130, respectively.

[0020] An insertion hole (not shown) is formed in the longitudinal center of the leaf spring 2 and in the center of the washer 140. The leaf spring 2 and the washer 140 form a leaf spring assembly that is fixed by fastening a center bolt 140a inserted through each insertion hole to a nut 140b. The leaf spring assembly is fixed to a housing 160 by a U-bolt 150. The housing 160 is fixed to the axle 100.

[0021] FIG. 2 is a diagram illustrating the configuration of a leaf spring included in the suspension system according to the first embodiment of the present invention. The leaf spring 2 has a main body 20 formed by bending one end of a strip-shaped member, a hook-shaped first end 21 provided at one end of the main body 20, and a second end 22 provided at the other end of the main body 20. The axle 100 is disposed below the main body 20 at the longitudinal center. The first end 21 is locked by a locking member 3. Here, "locking" refers to the fact that the first end 21 does not come off the locking member 3, and it does not matter whether the first end 21 rotates or does not rotate relative to the locking member 3. The leaf spring 2 is formed using a metal material (e.g., spring steel), a resin material, or fiber-reinforced plastics (FRP).

[0022] The holding member 4 is composed of a pair of rollers (a first roller 41 and a second roller 42). The first roller 41 has a first shaft portion 41a connected to the rear mounting portion 130 and a first rotating portion 41b that is rotatable relative to the first shaft portion 41a. The first rotating portion 41b rotates around the central axis N1 of the first shaft portion 41a relative to the first shaft portion 41a. The second roller 42 has a second shaft portion 42a connected to the rear mounting portion 130 and a second rotating portion 42b that is rotatable relative to the second shaft portion 42a. The second rotating portion 42b rotates around the central axis N2 of the second shaft portion 42a relative to the second shaft portion 42a. At least one of the first roller 41 and the second roller 42 is arranged so that its position on the rear mounting portion 130 can be changed under the control of the control device 200. In this embodiment 1, an example is described in which the first roller 41 and the second roller 42 are both arranged to be able to move back and forth in one direction along the longitudinal direction of the leaf spring 2 (in Figure 1, a direction inclined obliquely with respect to the fore-and-aft direction of the vehicle).

[0023] The first roller 41 and the second roller 42 contact and grip the leaf spring 2 with the leaf spring 2 inserted between them. The first shaft portion 41a and the second shaft portion 42a are formed using, for example, a metal material. The first rotating portion 41b and the second rotating portion 42b are formed using, for example, a metal material, a resin material, rubber, or the like. In this case, a damping effect can be obtained by forming at least one of the rotating portions using an elastic material such as rubber or resin. Furthermore, the damping effect can be adjusted by adjusting the distance between the first shaft portion 41a and the second shaft portion 42a. The first roller 41 and the second roller 42 face each other and correspond to a roller and a pressing member between which the end of the leaf spring 2 is provided.

[0024] The leaf spring 2 deforms in response to vibrations of the axle 100 due to road surface irregularities, etc. (See the dashed line in FIG. 2 ). The second end 22 is held by the retaining member 4 by being sandwiched between the first roller 41 and the second roller 42. When the second end 22 is displaced relative to the retaining member 4 due to deformation of the leaf spring 2, the length between the locking member 3 of the leaf spring 2 and the retaining member 4, i.e., the effective span of the leaf spring 2, changes, thereby changing the load characteristics of the leaf spring 2. In addition, at this time, the first rotating portion 41 b and the second rotating portion 42 b rotate in response to the displacement of the second end 22, thereby suppressing friction with the second end 22.

[0025] The control device 200 controls the operation of the rollers in the suspension system 1. In the first embodiment, the control device 200 controls the first roller 41 in the rear mounting portion 130 to move to any position. Each control device 200 is configured using a processor such as a CPU (Central Processing Unit) or various processors such as various arithmetic circuits that execute specific functions, such as an ASIC (Application Specific Integrated Circuit).

[0026] The control device 200 includes a memory for storing programs for executing various operations (for example, programs to be executed when controlling the movement of the rollers). The control device 200 includes a memory configured using volatile memory or nonvolatile memory, or a memory configured using a combination of these. For example, the memory may be configured using RAM (Random Access Memory), ROM (Read Only Memory), etc.

[0027] The control device 200 also includes an input unit that receives input of various signals related to the operation of the suspension device 1. This input unit is configured using a keyboard, a mouse, a switch, a touch panel, etc. The control device 200 may also include an output unit that displays images and outputs sound and light. This output unit is configured using a display, a speaker, a light source, etc.

[0028] 3 is a flowchart illustrating the flow of control performed by the control device provided in the suspension system according to Embodiment 1. First, when the input unit of the control device 200 receives a spring load change command, the control device 200 starts a spring load change process (step S101).

[0029] The control device 200 sets the direction and amount of movement of the rollers (step S102). The control device 200 sets the amount of movement toward the center or end of the leaf spring according to the conditions related to the load change command. Hereinafter, the first roller 41 and the second roller 42 may be collectively referred to as "rollers." The distance (gap) between the first roller 41 and the second roller 42 is set to, for example, a distance equal to the thickness of the leaf spring 2 or a distance smaller than the thickness. Note that "equal" here includes manufacturing errors, etc. Here, an example will be described in which the gap is controlled to be constant regardless of the movement of the rollers.

[0030] [Changing the Spring Constant Based on Load Weight] The control device 200 changes the spring constant based on the weight of the loaded luggage to maintain and improve handling stability according to the weight of the loaded luggage. In this case, for example, if the luggage weight is heavier than the set standard weight, the direction and amount of movement are set to increase the spring constant. Conversely, if the luggage weight is lighter than the standard weight, the direction and amount of movement are set to decrease the spring constant. To increase the spring constant, the control device 200 sets the direction of movement of the roller toward the center (toward the first end 21). To decrease the spring constant, the control device 200 sets the direction of movement of the roller toward the end (opposite the first end 21). The control device 200 also sets the amount of movement based on, for example, the difference from the standard weight. Note that the spring constant can also be changed by controlling the air suspension, but the change by changing the position of the roller described above provides a larger range of change.

[0031] [Vehicle Height Change] The control device 200 sets the vehicle height to be higher to prevent the vehicle body from sinking due to the load and to ensure road clearance when traveling on rough roads or slopes. In this case, for example, when the weight of the load is heavier than the standard weight or when road clearance needs to be ensured when traveling on rough roads or slopes, the direction and amount of movement are set to increase the vehicle height. On the other hand, when passing through roads or buildings with height restrictions or when improving fuel economy, the direction and amount of movement are set to decrease the vehicle height. When increasing the vehicle height, the control device 200 sets the direction of movement of the rollers toward the center (toward the first end 21), and when lowering the vehicle height, the control device 200 sets the direction of movement of the rollers toward the end (opposite the first end 21). The control device 200 also sets the amount of movement depending on, for example, the adjusted height of the vehicle height. Note that fuel economy can be improved by lowering the vehicle height and reducing air resistance. Furthermore, the vehicle height on the rear wheel side can be made higher than the front wheel side to make it easier to load luggage, or the vehicle height on the rear wheel side can be made lower than the front wheel side to make it easier to load and unload luggage.

[0032] In this way, when the roller is moved toward the center (toward the first end 21), the spring constant increases and the vehicle height increases. On the other hand, when the roller is moved toward the end (opposite the first end 21), the spring constant decreases and the vehicle height decreases.

[0033] After setting the direction and amount of movement of the rollers, the control device 200 controls the movement of the rollers and changes the positions of the rollers (step S103), thereby adjusting the spring constant and vehicle height.

[0034] In the first embodiment of the present invention described above, one end of the leaf spring 2, which deforms in response to vibration of the axle 100, is engaged with the vehicle body (here, frame 110), and the other end is gripped by the first roller 41 and the second roller 42, and the first roller 41 and the second roller 42 rotate in response to displacement of the end of the other end due to deformation. According to the first embodiment, the rotation of the rollers suppresses the generation of friction between the leaf spring 2 and the retaining member 4, thereby suppressing a decrease in durability and the generation of abnormal noise due to friction between the leaf spring and the retaining member.

[0035] Here, when the end of the leaf spring 2 is held by a slide seat, if the leaf spring 2 breaks forward of the axle, the body of the leaf spring 2 rotates around the rear end connection portion, causing the axle to move closer to the vehicle body, resulting in a significant drop in vehicle height. In contrast, when the leaf spring 2 is sandwiched between the first roller 41 and the second roller 42 located rearward of the first roller 41 on the vehicle body, as in the first embodiment, even if the leaf spring 2 breaks forward, a repulsive force is generated on the rear side due to the sandwiching, so a significant drop in vehicle height can be prevented.

[0036] Furthermore, according to the first embodiment, the position of the roller at the other end of the leaf spring 2 (here, rear mounting portion 130) is changed relative to one end of the leaf spring 2 (here, front mounting portion 120), so the spring constant and vehicle height can be changed depending on the situation, making it possible to prevent damage to cargo, adjust ride comfort, and improve the efficiency of cargo loading. As an example of roller position control according to the first embodiment, by moving the roller from the standard position to a position closer to the center of the leaf spring, both the spring constant and vehicle height can be increased compared to when the roller is in the standard position, thereby achieving both steering stability and ensuring vehicle height.

[0037] Furthermore, according to the first embodiment, by holding the leaf spring 2 by rollers, it is possible to give the suspension unit consisting of the leaf spring 2, the locking member 3, and the holding member 4 nonlinear characteristics with a simpler structure than conventional leaf springs in which a main spring and multiple sub-springs are stacked.

[0038] Furthermore, in the first embodiment, the thickness of the rotating portion relative to the rotating shaft can be made uniform, making the resistance that the leaf spring receives from the rollers uniform, thereby improving vibration-proofing properties and durability.

[0039] In the first embodiment described above, an example has been described in which the reciprocating motion is possible in a direction inclined obliquely with respect to the longitudinal direction of the vehicle, but the angle of inclination can be set appropriately depending on the adjustment mode.

[0040] (Variation 1) Next, Variation 1 of Embodiment 1 of the present invention will be described. In the suspension device according to Variation 1, one of the first roller 41 and the second roller 42 of the holding member 4 is provided movably on the rear mounting portion 130. Here, the description will be given assuming that the first roller 41 is movable. The other components have the same configuration as in the embodiment, and therefore description thereof will be omitted.

[0041] In this first modification, the control device 200 controls the first roller 41 in the same manner as in the embodiment. In this case, when setting the direction and amount of movement of the roller in step S102, the control device 200 sets the amount of movement of the first roller 41 in the forward or backward direction. Note that although an example in which the first roller 41 moves will be described, if the second roller 42 moves, the control device 200 sets the direction and amount of movement of the second roller 42.

[0042] After setting the direction and amount of movement of the first roller 41, the control device 200 controls the movement of the first roller 41 and changes the relative position of the first roller 41 with respect to the second roller 42 (step S103), thereby adjusting the spring constant and vehicle height.

[0043] In the first modification described above, similarly to the first embodiment, one end of the leaf spring 2 that deforms in response to vibration of the axle 100 is engaged with the vehicle body (here, frame 110) and the other end is gripped by first roller 41 and second roller 42, and the first roller 41 and second roller 42 rotate in response to displacement of the end of the other end due to deformation. According to the first modification, the rotation of the rollers suppresses the generation of friction between the leaf spring 2 and the retaining member 4, thereby suppressing a decrease in durability and the generation of abnormal noise due to friction between the leaf spring and the retaining member.

[0044] Furthermore, according to this modification 1, the position of one roller at the other end of the leaf spring 2 (here, the rear mounting portion 130) is changed relative to the position of the other roller, so the spring constant and vehicle height can be changed depending on the situation, thereby minimizing damage to cargo, adjusting ride comfort, and improving cargo loading efficiency. As an example of position control according to this modification 1, by moving the first roller from the standard position to a position closer to the center of the leaf spring, the spring constant can be increased without increasing the spring stress compared to when the first roller is in the standard position, thereby improving spring durability. In another example of position control according to this modification 1, by moving the first roller from the standard position to a position closer to the end of the leaf spring, the spring constant and vehicle height can be reduced, improving ride comfort while stabilizing high-speed driving.

[0045] (Modification 2) Next, a description will be given of Modification 2 of the first embodiment of the present invention. In the suspension device according to Modification 2, the first roller 41 and the second roller 42 of the holding member 4 are provided so as to be independently movable on the rear mounting portion 130. The other components are configured the same as in the embodiment, and therefore description thereof will be omitted.

[0046] In Modification 2, control device 200 controls first roller 41 and second roller 42 in the same manner as in Embodiment 1. In this case, when setting the direction and amount of movement of the rollers in step S102, control device 200 sets the amount of movement of first roller 41 and second roller 42 in the forward or backward direction, respectively.

[0047] After setting the direction and amount of movement of the first roller 41 and the second roller, the control device 200 controls the movement of the first roller 41 and the second roller (step S103), thereby adjusting the spring constant and vehicle height.

[0048] In the second modification described above, similarly to the first embodiment, one end of the leaf spring 2 that deforms in response to vibration of the axle 100 is engaged with the vehicle body (here, frame 110) and the other end is gripped by the first roller 41 and the second roller 42, and the first roller 41 and the second roller 42 rotate in response to displacement of the end of the other end due to deformation. According to the second modification, the rotation of the rollers suppresses the generation of friction between the leaf spring 2 and the retaining member 4, thereby suppressing a decrease in durability and the generation of abnormal noise due to friction between the leaf spring and the retaining member.

[0049] Furthermore, according to this modification 2, it is possible to set the movement amounts of the pair of rollers to be different from each other at the other end side (here, rear attachment portion 130) of leaf spring 2. As an example of position control according to this modification 2, first roller 41 and second roller 42 are moved from the standard position toward the end side, and the movement amount of second roller 42 is made larger relative to the movement amount of first roller 41, thereby reducing the spring constant and controlling so that the vehicle height remains almost unchanged, thereby making it possible to stabilize normal driving and improve ride comfort.

[0050] (Embodiment 2) Next, a second embodiment of the present invention will be described with reference to Fig. 4. Fig. 4 is a diagram for explaining the operation of the rollers of a suspension device according to embodiment 2 of the present invention. In the suspension device according to embodiment 2, the first roller 41 and the second roller 42 of the holding member 4 are provided so as to be movable in directions toward or away from each other in the rear mounting portion 130. In this embodiment 2, an example will be described in which the rollers move in the thickness direction of the leaf spring. The other components have the same configuration as in the embodiment, and therefore description thereof will be omitted.

[0051] In the second embodiment, the control device 200 controls the first roller 41 in the same manner as in the first embodiment. In this case, when setting the roller movement direction and movement amount in step S102, the control device 200 sets the movement amount in each direction for the first roller 41 and the second roller 42. Note that the movement amount may be set for both the first roller 41 and the second roller 42, or for only one of them.

[0052] After setting the direction and amount of movement of the rollers, the control device 200 controls the movement of the rollers and changes their positions (step S103). At this time, if the rollers are moved closer to each other, the change in the spring constant and vehicle height is small, but the friction between the leaf spring 2 and the rollers, and the friction between the leaves if the leaf spring 2 is a laminated type, increases, making it possible to increase the damping force.

[0053] In the second embodiment described above, similarly to the above-described embodiment, one end of the leaf spring 2 that deforms in response to vibration of the axle 100 is engaged with the vehicle body (here, frame 110) and the other end is gripped by first roller 41 and second roller 42, and the first roller 41 and second roller 42 rotate in response to displacement of the end of the other end due to deformation. According to the second embodiment, the rotation of the rollers suppresses the generation of friction between the leaf spring 2 and the retaining member 4, thereby suppressing a decrease in durability and the generation of abnormal noise due to friction between the leaf spring and the retaining member.

[0054] Furthermore, according to the second embodiment, the position of the roller at the other end side of the leaf spring 2 (here, the rear mounting portion 130) is changed relative to one end side of the leaf spring 2 (here, the front mounting portion 120), so that the damping force of the leaf spring 2 can be changed depending on the situation.

[0055] Up to this point, the embodiments for carrying out the present invention have been described, but the present invention should not be limited to only the above-described embodiments. In the above-described embodiments and modifications, the axle 100 and the leaf spring 2 are connected via a U-bolt 150. However, a configuration without a U-bolt, for example, in which the axle 100 and the leaf spring 2 are directly connected, may also be used. Furthermore, in the above-described first and second embodiments and modifications, the leaf spring 2 is arranged above the axle 100, but the leaf spring 2 may also be arranged below the axle 100.

[0056] Furthermore, the first and second embodiments may be combined to form a configuration in which the rollers are movable in a two-dimensional plane at the rear mounting portion 130. Furthermore, the rollers may be movable in the axial direction of the axle, so that the rollers are movable in three-dimensional space. By moving the rollers to a position that restricts the lateral movement of the leaf springs 2, the suspension unit consisting of the leaf springs 2, the locking members 3, and the holding members 4, it is possible to improve the lateral rigidity of the suspension unit, which is made up of the leaf springs 2, the locking members 3, and the holding members 4, and to change the orientation of the wheels relative to the direction of travel of the vehicle.

[0057] Furthermore, in the first and second embodiments and the modified example, examples have been described in which the movement of the rollers is controlled by the control device 200, but the configuration may also be such that the user manually changes the position of the rollers. In the case of a manual configuration, the suspension system 10 is made up of the suspension device 1. In this case, position adjustment members or the like may be provided on the rollers or the like.

[0058] In addition, in embodiments 1, 2 and the modified example, a rotary table supporting the first roller 41 and the second roller 42 may be provided on the rear mounting portion 130, and the first roller 41 and the second roller 42 may rotate (revolve) around the rotation axis of the rotary table.

[0059] In addition, in the first and second embodiments and the modified examples, a protrusion that protrudes from the rotating part may be provided at the end of the roller opposite to the rear mounting part 130 side to prevent the leaf spring 2 from coming off.

[0060] In the embodiment, one of the rollers may be a non-rotating holding member (corresponding to a pressing member). For example, the holding member may be used instead of the second roller 42, and the leaf spring 2 may be held by the first roller 41 and the pressing member. In this case, the surface of the holding member that comes into contact with the leaf spring 2 may be curved, or a recess may be formed on the surface that comes into contact with the leaf spring 2.

[0061] In the embodiment, the first roller 41 and the second roller 42 may be supported by shackles.

[0062] As such, the present invention may include various embodiments not described here, and various design changes may be made within the scope of the technical idea specified by the claims.

[0063] As described above, the vehicle suspension system according to the present invention is suitable for suppressing a decrease in durability due to friction between the leaf spring and the retaining member, and suppressing the generation of abnormal noise.

[0064] REFERENCE SIGNS LIST 1 Suspension device 2 Leaf spring 3 Locking member 4 Holding member 10 Suspension system 41 First roller 42 Second roller 41a First shaft portion 41b First rotating portion 42a Second shaft portion 42b Second rotating portion 100 Axle 101 Wheel 110 Frame 120 Front mounting portion 130 Rear mounting portion 140 Washer 150 U-bolt 160 Housing 200 Control device

Claims

1. A vehicle suspension system comprising: a leaf spring; a locking member to which one end of the leaf spring is locked; and a holding member for holding the other end of the leaf spring, wherein the holding member holds the other end of the leaf spring and has a roller that holds the other end of the leaf spring and is rotatable following the displacement of the other end of the leaf spring; and a pressing member facing the roller, wherein the other end of the leaf spring is provided between the roller and the pressing member, and the roller and the pressing member are provided so as to be able to change the contact state of the leaf spring between the roller and the pressing member.

2. The vehicle suspension system according to claim 1, wherein the other end of the leaf spring is sandwiched and held by the roller and the pressing member.

3. The vehicle suspension system according to claim 1, wherein the roller and the pressing member are movable while their relative positions are fixed.

4. The vehicle suspension system according to claim 1, wherein at least one of the roller and the pressing member is movable.

5. The vehicle suspension system according to claim 1, wherein the roller and / or the pressing member is movable in the approximately front-rear direction of the vehicle.

6. The vehicle suspension system according to claim 1 or 5, characterized in that the roller and / or the pressing member are movable in the substantially vertical direction of the vehicle.

7. The vehicle suspension system according to claim 1, further comprising a control device for controlling the movement of the roller and / or the pressing member.

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