Vehicular suspension device

Abstract

According to the present invention, a vehicular suspension device, which is provided on the body of a vehicle and supports an axle, is equipped with: a plate spring; a locking member to which one end of the plate spring is locked; a holding member that holds the other end of the plate spring; and a support member that is swingably attached to the body and supports the holding member, wherein the holding member has a pair of pressing members that sandwich and hold the other end of the plate spring, and a connection part that connects the pair of pressing members.

Description

Vehicle suspension system

[0001] The present invention relates to a suspension system for a vehicle.

[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 / 1986

[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 device 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 device of the present invention is a suspension device that is provided on the body of a vehicle and supports an axle, and includes a leaf spring, a locking member to which one end of the leaf spring is locked, a holding member that holds the other end of the leaf spring, and a support member that is attached to the body so as to be able to swing freely and supports the holding member, and the holding member has a pair of pressing members that sandwich and hold the other end of the leaf spring, and a connecting portion that connects the pair of pressing members.

[0008] In addition, in the vehicle suspension system according to the present invention, the holding member is supported so as to be able to swing freely relative to the support member.

[0009] In addition, the vehicle suspension device of the present invention is characterized in that, in the above invention, the pressing member has a shaft portion supported by the connection portion and an outer periphery portion provided on the outer periphery of the shaft portion and rotatable relative to the shaft portion.

[0010] In addition, in the vehicle suspension system according to the present invention, the thickness of the leaf spring increases toward the center in the longitudinal direction from one end to the other end.

[0011] Furthermore, in the vehicle suspension system according to the present invention, the pressing member has a multi-layer structure including an elastic material.

[0012] 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.

[0013] Fig. 1 is a diagram showing the configuration of a portion of a vehicle including a suspension system according to an embodiment of the present invention. Fig. 2 is a diagram for explaining the configuration of a leaf spring of a suspension system according to an embodiment of the present invention. Fig. 3 is a diagram showing the configuration of a portion of a vehicle including a suspension system according to a first modified example of the present invention. Fig. 4 is a diagram showing the configuration of a portion of a vehicle including a suspension system according to a second modified example of the present invention. Fig. 5 is a diagram showing the configuration of a pressing member of a suspension system according to a third modified example of the present invention. Fig. 6 is a diagram showing the configuration of a portion of a vehicle including a suspension system according to a fourth modified example of the present invention. Fig. 7 is a diagram showing the configuration of a pressing member of a suspension system according to a fifth modified example of the present invention.

[0014] 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.

[0015] (Embodiment) Fig. 1 is a diagram showing the configuration of a portion of a vehicle including a suspension device according to one embodiment of the present invention. The suspension device 1 shown in Fig. 1 is mounted on the body of the 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 device 1 includes a leaf spring 2, a locking member 3 to which one end of the leaf spring 2 is locked, a holding member 4 that holds the other end of the leaf spring 2 so that it can move back and forth, and a support member 5 that supports the holding member 4 so that it can swing.

[0016] The locking member 3 and the holding member 4 are attached to a frame 110 that is fixed to the vehicle body. 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 via a support member 5. 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 support member 5 is attached to the rear mounting portion 130 in a swingable manner. The locking member 3 and the support member 5 may be formed integrally with the front mounting portion 120 and the rear mounting portion 130, respectively.

[0017] 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.

[0018] FIG. 2 is a diagram illustrating the configuration of a leaf spring of a suspension system according to one 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 being wrapped around a locking member 3. "Locked" here means 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).

[0019] The holding member 4 has a pair of pressing members (a first pressing member 41 and a second pressing member 42) and a connecting portion 43 that connects the pressing members. The first pressing member 41 and the second pressing member 42 face each other, and the end of the leaf spring 2 passes between them.

[0020] The first pressing member 41 has a first shaft 41a connected to the rear mounting portion 130 via the support member 5, and a first outer circumferential portion 41b provided around the first shaft 41a. The second pressing member 42 has a second shaft 42a connected to the rear mounting portion 130 via the support member 5, and a second outer circumferential portion 42b provided around the second shaft 42a.

[0021] The first shaft portion 41a and the second shaft portion 42a are formed using, for example, a metal material. The first outer peripheral portion 41b and the second outer peripheral portion 42b are formed using, for example, a metal material, a resin material, rubber, or the like. By forming the outer peripheral portions using an elastic material such as rubber or resin, a damping effect can be obtained. Furthermore, the damping effect can be adjusted by adjusting the distance between the first shaft portion 41a and the second shaft portion 42a.

[0022] The distance (gap) between the first pressing member 41 and the second pressing member 42 is, for example, equal to or smaller than the thickness of the leaf spring 2. Therefore, when the leaf spring 2 is disposed between the pressing members, the first pressing member 41 and the second pressing member 42 each come into contact with the leaf spring 2 and clamp the leaf spring 2 by sandwiching and pressing it. Note that the term "equal" here includes manufacturing errors and the like.

[0023] The connecting portion 43 connects the first shaft portion 41 a and the second shaft portion 42 a. The connecting portion 43 connects the first shaft portion 41 a and the second shaft portion 42 a in at least one direction of the central axes of the shaft portions (here, a direction perpendicular to the plane of the paper in FIG. 2 ). In the present embodiment, both ends of the connecting portion 43 are fixed to the first shaft portion 41 a and the second shaft portion 42 a, respectively.

[0024] The support member 5 has a support portion 52 that is swingable around a central axis 51. The central axis 51 is supported by the vehicle body. In this embodiment, the central axis 51 extends from the rear mounting portion 130. Therefore, the holding member 4 is swingable around the central axis 51 at the rear mounting portion 130. In this embodiment, the support member 5 is provided so as to be fixable at any position.

[0025] One end of the support portion 52 is connected to the central shaft 51 fixed to the vehicle body (here, the rear mounting portion 130), and the other end is connected to the first shaft portion 41a of the first pressing member 41. The support portion 52 is connected to the side opposite to the side to which the connecting portion 43 of the first shaft portion 41a is connected. Note that the support portion 52 may be configured to be connected to the side to which the connecting portion 43 of the first shaft portion 41a is connected.

[0026] The leaf spring 2 deforms in response to vibrations of the axle 100 due to road irregularities and the like (see the dashed line in FIG. 2 ). At this time, the support member 5 swings due to a change in the load applied by the leaf spring 2 caused by the deformation of the leaf spring 2, and the position of the retaining member 4 changes. The second end 22 is held by the retaining member 4 by being sandwiched between the first pressing member 41 and the second pressing member 42. For example, the support member 5 swings to a position where a line connecting the first pressing member 41 and the second pressing member 42 is perpendicular to the longitudinal direction of the leaf spring 2 at the contact portion with the leaf spring 2. This swing of the support member 5 adjusts the length between the locking member 3 and the retaining member 4 of the leaf spring 2, i.e., the effective span of the leaf spring 2, thereby maintaining the load characteristics of the leaf spring 2 or reducing a load that may increase due to deformation of the leaf spring 2.

[0027] In the 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 pressing member 41 and the second pressing member 42, and the support member 5 that supports the retaining member 4 swings in response to deformation of the leaf spring 2. According to this embodiment, the swinging of the support member 5 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.

[0028] If the end of the leaf spring 2 is held by a slide seat, and the leaf spring 2 breaks forward of the axle, the body of the leaf spring 2 rotates around the rear end connection, causing the axle to move closer to the vehicle body, resulting in a significant drop in vehicle height. In contrast, if the leaf spring 2 is clamped by a retainer member rearward of the central axis 51, as in this embodiment, even if the leaf spring 2 breaks forward, a repulsive force is generated on the rear side due to the clamping, preventing a significant drop in vehicle height.

[0029] Furthermore, according to this embodiment, by holding the leaf spring 2 with a pressing member, it is possible to give the leaf spring 2 nonlinear characteristics with a simpler structure than conventional leaf springs in which a main spring and multiple sub-springs are stacked.

[0030] (Variation 1) Next, Variation 1 of the embodiment of the present invention will be described with reference to Fig. 3. Fig. 3 is a diagram showing the configuration of a portion of a vehicle including a suspension device according to Variation 1 of the present invention. The suspension device according to Variation 1 includes a support member 5A instead of the support member 5, and the holding member 4 is capable of swinging relative to the support member 5A. The other components are configured the same as in the embodiment, and therefore description thereof will be omitted.

[0031] The support member 5A has a support portion 52 that can swing around a central axis 51, and a rotation shaft 53. The rotation shaft 53 is provided at the end of the support member 5A on the side opposite to the side where the central axis 51 is disposed. In this first modification, the holding member 4 is connected to the rotation shaft 53 so as to be able to swing freely. Therefore, the holding member 4 can swing around the rotation shaft 53 of the support member 5A.

[0032] In this first modification, a change in the load applied from the leaf spring 2 due to deformation of the leaf spring 2 causes the support member 5A to swing about the central axis 51, and the holding member 4 to swing about the rotation axis 53. For example, the holding member 4 and the support member 5A swing so that the first pressing member 41 and the second pressing member 42 are in positions where a uniform load is applied to the leaf spring 2 (for example, positions where a line segment connecting the first pressing member 41 and the second pressing member 42 is perpendicular to the longitudinal direction of the leaf spring 2 at the contact portion with the leaf spring 2). This swing of the support member 5A and the holding member 4 adjusts the length between the locking member 3 and the holding member 4 of the leaf spring 2, i.e., the effective span of the leaf spring 2, and thereby maintains the load characteristics of the leaf spring 2 or reduces a load that may increase due to deformation of the leaf spring 2.

[0033] In the first modification described above, similar to the embodiment, 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 first pressing member 41 and second pressing member 42, and the retaining member 4 and the support member 5A that supports the retaining member 4 swing in response to deformation of the leaf spring 2. According to the first modification, the swinging of the retaining member 4 and the support member 5A suppresses the occurrence of friction between the leaf spring 2 and the retaining member 4, thereby suppressing a decrease in durability and the occurrence of abnormal noise due to friction between the leaf spring and the retaining member.

[0034] (Modification 2) Next, Modification 2 of the embodiment of the present invention will be described with reference to Fig. 4. Fig. 4 is a diagram showing the configuration of a portion of a vehicle including a suspension system according to Modification 2 of the present invention. The suspension system according to Modification 2 includes a retaining member 4A instead of the retaining member 4. The other components are configured the same as in the embodiment, and therefore description thereof will be omitted.

[0035] The holding member 4A includes a first pressing member 41, a second pressing member 42, and a connecting portion 43 connecting the first pressing member 41 and the second pressing member 42. In this second modification, the first outer peripheral portion 41b (see FIG. 2) of the first pressing member 41 is rotatable relative to the first shaft portion 41a. The first outer peripheral portion 41b rotates around the central axis N1 of the first shaft portion 41a relative to the first shaft portion 41a. The second pressing member 42 has a second outer peripheral portion 42b (see FIG. 2) that is rotatable relative to the second shaft portion 42a. The second outer peripheral portion 42b is connected to the second shaft portion 42a via, for example, a bearing, and rotates around the central axis N2 of the second shaft portion 42a. The central axis N1 and the central axis N2 extend in the width direction of the leaf spring 2 (a direction perpendicular to the plane of the drawing).

[0036] The distance (gap) between the first pressing member 41 and the second pressing member 42 is, for example, equal to the thickness of the leaf spring 2. Therefore, when the leaf spring 2 is arranged between the pressing members, the first pressing member 41 and the second pressing member 42 each come into contact with the leaf spring 2 and grip the leaf spring 2.

[0037] In the second modification, a change in the load applied from the leaf spring 2 due to deformation of the leaf spring 2 causes the support member 5 to swing around the central axis 51. At this time, the holding member 4A is connected to the support member 5, but the holding member 4A may also be connected so as to swing around a rotation axis 53 (see FIG. 3 ). This swing of the support member 5 and the holding member 4 adjusts the length between the locking member 3 of the leaf spring 2 and the holding member 4A, i.e., the effective span of the leaf spring 2, and the load characteristics of the leaf spring 2 are maintained or the load that may increase due to deformation of the leaf spring 2 is reduced.

[0038] In the second modification described above, similar to the embodiment, 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 first pressing member 41 and second pressing member 42, and the support member 5 that supports retaining member 4A swings in response to deformation of the leaf spring 2. According to the second modification, the swinging of support member 5 suppresses the occurrence of friction between the leaf spring 2 and retaining member 4A, thereby suppressing a decrease in durability and the occurrence of abnormal noise due to friction between the leaf spring and retaining member.

[0039] Furthermore, according to the second modification, the first outer peripheral portion 41b and the second outer peripheral portion 42b rotate in response to the displacement of the second end portion 22, thereby making it possible to suppress the occurrence of friction between them and the second end portion 22.

[0040] In the second modification, only one of the pressing members may be rotatable, and the other pressing member may be non-rotatable.

[0041] (Variation 3) Next, Variation 3 of the embodiment of the present invention will be described with reference to Fig. 5. Fig. 5 is a diagram showing the configuration of the rollers of a suspension device according to Variation 3 of the present invention. The suspension device according to Variation 3 includes a holding member 4B instead of the holding member 4. Furthermore, the first pressing member 41 and the second pressing member 42 of the holding member 4B are attached to the frame 110 so as to be relatively movable. The other components have the same configuration as in the embodiment, and therefore description thereof will be omitted. Note that the same components are assigned the same reference numerals.

[0042] The holding member 4B includes two pressing members (a first pressing member 41 and a second pressing member 42), a first spring member 44 connecting the axial ends of the two pressing members together, and a second spring member 45 connecting the axial ends of the two pressing members together. For example, the first spring member 44 connects one axial end of the first shaft portion 41a (axis N1: see FIG. 4) to one axial end of the second shaft portion 42a (axis N2: see FIG. 4) in a freely expandable manner. The second spring member 45 connects the other axial end of the first shaft portion 41a (axis N1) to the other axial end of the second shaft portion 42a in a freely expandable manner.

[0043] In the third modification, the first pressing member 41 and the second pressing member 42 are biased toward each other by spring members, which are biasing members. For example, in a natural state where no load other than gravity is applied to the spring members, the distance (gap) between the pressing members is equal to or less than the thickness of the leaf spring 2. Therefore, when the leaf spring 2 is disposed between the pressing members, the first pressing member 41 and the second pressing member 42 each come into contact with the leaf spring 2 and grip the leaf spring 2.

[0044] In the third modification described above, similar to the embodiment, 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 first pressing member 41 and second pressing member 42, and the support member 5 that supports retaining member 4B swings in response to deformation of the leaf spring 2. According to the third modification, the swinging of support member 5 suppresses the occurrence of friction between the leaf spring 2 and retaining member 4B, thereby suppressing a decrease in durability and the occurrence of abnormal noise due to friction between the leaf spring and retaining member.

[0045] Furthermore, according to variant example 3, the spring member changes the distance between the pressure members in response to the displacement of the leaf spring 2, thereby preventing the leaf spring 2 from being subjected to excessive load from the pressure members and preventing the smooth deformation behavior of the leaf spring from being hindered.

[0046] In the third modification, an example has been described in which a spring member is used as a member for adjusting the spacing between the pressing members, but the present invention is not limited to this. For example, the spacing between the pressing members may be electrically controlled by an actuator.

[0047] Furthermore, in this embodiment, the thickness of the outer periphery of the rotating shaft is made uniform, which makes it possible to uniformize the resistance that the leaf spring receives from the pressing member, thereby improving vibration-proofing properties and durability.

[0048] (Modification 4) Next, Modification 4 of the embodiment of the present invention will be described with reference to Fig. 6. Fig. 6 is a diagram showing the configuration of a portion of a vehicle including a suspension system according to Modification 4 of the present invention. The suspension system according to Modification 4 includes a leaf spring 2A instead of the leaf spring 2. The other components are configured the same as in the embodiment, and therefore description thereof will be omitted. Note that the same components are assigned the same reference numerals.

[0049] The plate spring 2A has a thickness that increases in the longitudinal direction of the main body 20 from the first end 21 to the second end 22 toward the center of the main body 20 in the longitudinal direction.

[0050] In the fourth modification described above, similar to the embodiment, one end of the leaf spring 2A, 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 first pressing member 41 and second pressing member 42, and the support member 5 that supports the retaining member 4 swings in response to deformation of the leaf spring 2A. According to the fourth modification, the swinging of the support member 5 suppresses the occurrence of friction between the leaf spring 2A and the retaining member 4, thereby suppressing a decrease in durability and the occurrence of abnormal noise due to friction between the leaf spring and the retaining member.

[0051] Furthermore, in the present modified example 4, the thickness of the leaf spring 2A is configured to increase toward the center in the longitudinal direction, which makes it possible to make the stress uniform.

[0052] (Variation 5) Next, Variation 5 of the embodiment of the present invention will be described with reference to Fig. 7. Fig. 7 is a diagram showing the configuration of the pressing member of a suspension device according to Variation 5 of the present invention. The suspension device according to Variation 5 includes a pressing member 46 instead of the first pressing member 41 and / or the second pressing member 42 of the holding member 4. The other components have the same configuration as in the embodiment, and therefore description thereof will be omitted.

[0053] The pressing member 46 has a shaft portion 46a that is connected to the rear attachment portion 130 via the support member 5, and an outer peripheral portion 46b that is provided around the shaft portion 46a.

[0054] The outer peripheral portion 46b has a hollow cylindrical first portion 461 through which the shaft portion 46a is inserted, and a second portion 462 covering the outer peripheral surface of the first portion 461. The first portion 461 is formed using, for example, an elastic material such as a resin material or rubber, or an elastic member such as a mesh spring. The second portion 462 is formed using a material such as a metal material that is more rigid than the first portion 461 but less rigid than the leaf spring 2. This improves the durability of the leaf spring while providing the functionality of the present invention. Here, the outer peripheral portion 46b has a multilayer structure including an elastic material. Therefore, the pressing member 46 has a multilayer structure including an elastic material. Note that the multilayer structure is not limited to the two layers of a metal material and an elastic material shown in FIG. 7, but may have three or more layers including a layer of an elastic material.

[0055] In the fifth modification described above, similar to the embodiment, 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 two pressing members 46, and the support member 5 that supports the retaining member swings in response to deformation of the leaf spring 2. According to the fifth modification, the swinging of the support member 5 suppresses the occurrence of friction between the leaf spring 2 and the retaining member, thereby suppressing a decrease in durability and the occurrence of abnormal noise due to friction between the leaf spring and the retaining member.

[0056] Furthermore, according to the fifth modification, the outer peripheral portion 46b is configured to have the first portion 461 having elasticity and the second portion 462 having higher rigidity than the first portion 461, so that the impact from the leaf spring 2 is absorbed by the first portion 461, thereby suppressing damage to the pressing member and the leaf spring 2. Furthermore, the elastic first portion 461 can absorb impact when the vehicle is traveling, improving ride comfort, and reducing rolling resistance allows for smoother operation.

[0057] In addition, in Modification 5, one of the presser members may be presser member 46, and the other presser member may be first presser member 41 or second presser member 42. For example, by using presser member 46 as the presser member located on the upper side of the vehicle body, the elastic member (first portion 461) is present in the load flow path from leaf spring 2 to the vehicle body, thereby improving the ride comfort of the vehicle. On the other hand, by using presser member 46 as the presser member located on the lower side of the vehicle body, the durability of leaf spring 2 and the presser member may be improved.

[0058] 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 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.

[0059] Furthermore, in the embodiment, the support member 5 is described as being provided so as to be fixable at any position, but it may be provided so as to be able to swing in response to the load from the leaf spring 2 .

[0060] In addition, in the embodiment, a rotary table that supports the first pressing member 41 and the second pressing member 42 may be provided on the rear mounting portion 130, and the first pressing member 41 and the second pressing member 42 may be configured to rotate (revolve) around the rotation axis of the rotary table.

[0061] In the embodiment and modified examples, a protrusion may be provided on the side of the pressing member opposite to the vehicle body side to prevent the leaf spring 2 from falling off the holding member.

[0062] In addition, in the embodiment, a holding member 4 may be provided in place of the locking member 3, and both ends of the leaf spring 2 may be held by a pressing member.

[0063] In the embodiment and modified examples, the pressing member may have a curved surface on the side that comes into contact with the leaf spring 2, or may have a recess formed on the surface that comes into contact with the leaf spring 2.

[0064] 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.

[0065] As described above, the vehicle suspension device 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.

[0066] REFERENCE SIGNS LIST 1 Suspension device 2 Leaf spring 3 Locking member 4, 4A Holding member 5 Support member 41 First pressing member 42 Second pressing member 46 Pressing member 41a First shaft portion 41b First outer peripheral portion 42a Second shaft portion 42b Second outer peripheral portion 43 Connection portion 44 First spring member 45 Second spring member 46a Shaft portion 46b Outer peripheral portion 100 Axle 101 Wheel 110 Frame 120 Front mounting portion 130 Rear mounting portion 140 Washer 150 U-bolt 160 Housing 461 First portion 462 Second portion

Claims

1. A suspension device provided on a vehicle body and supporting an axle, comprising: a leaf spring; a locking member to which one end of the leaf spring is locked; a retaining member which holds the other end of the leaf spring; and a support member attached to the vehicle body so as to be able to swing freely, and which supports the retaining member, wherein the retaining member has a pair of pressing members which sandwich and hold the other end of the leaf spring, and a connection portion which connects the pair of pressing members.

2. The vehicle suspension system according to claim 1, wherein the retaining member is supported so as to be freely swingable relative to the supporting member.

3. A vehicle suspension device as described in claim 1, characterized in that the pressing member has a shaft portion supported by the connection portion, and an outer circumferential portion provided on the outer periphery of the shaft portion and rotatable relative to the shaft portion.

4. The vehicle suspension device according to claim 1, wherein the leaf spring has a thickness that increases toward the center in the longitudinal direction from one end to the other end.

5. The vehicle suspension system according to claim 3, wherein the pressing member has a multi-layer structure including an elastic material.

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