JP2008179323A - Suspension arm structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a suspension arm structure capable of avoiding its complication and suppressing increase in the number of part items and weight. <P>SOLUTION: A knuckle support part 110 of a rear suspension arm is protruded from a rim 3b of a wheel 3a to a vehicle body inner side, and is formed of a plate member covering the lower side of a boot 89a covering a connection portion of a drive shaft and a universal joint. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a suspension arm structure for a vehicle in which a connecting portion between a drive shaft for transmitting power from an engine and a universal joint on a wheel side is covered with a boot.

For vehicles with independent left and right wheels, the knuckle is supported by upper and lower suspension arms supported swingably on the body frame, and the wheel of the wheel is connected to a hub that is rotatably supported by the knuckle. There is known one in which each wheel is rotationally driven by a drive shaft to which the motive power is transmitted via a final reduction gear (see, for example, Patent Document 1).
In this vehicle, the connecting portion between the drive shaft and the wheel is constituted by a universal joint, and the connecting portion between the drive shaft and the universal joint is covered with a boot, and this boot is removed from the wheel wheel depth (rim width). It sticks out toward you. The suspension arm of this vehicle is formed in a substantially U shape by connecting one end of the front and rear pipes, and the other end is supported by the body frame so as to be swingable, so that there is a gap between the front and rear pipes. ing.
When the vehicle body is viewed from below, the boot is exposed from the gap between the pipes before and after the suspension arm. Therefore, when traveling on rough terrain, a protective member such as a guard may be provided between the pipes before and after the suspension arm.
JP 2001-328410 A

  However, in the conventional configuration, the structure of the suspension arm becomes complicated due to the provision of the protection member. For example, the suspension arm needs to have a shape that secures the attachment space for the protection member, or the suspension arm has a structure for attaching the protection member. It was necessary to provide a bracket. Further, it is expected that the number of parts and the weight will be increased by providing a protective member separately.

  The present invention has been made in view of the circumstances described above, and it is an object of the present invention to provide a suspension arm structure that can avoid the complexity of the structure of the suspension arm and can suppress an increase in the number of parts and an increase in weight. .

In order to solve the above-mentioned problems, the present invention comprises a drive shaft for independently suspending left and right wheels swingably on a frame via a suspension arm, and transmitting power from an engine to each wheel. A knuckle support portion of the suspension arm is coupled to the connected hub via a knuckle, and the drive shaft is coupled to the axle coupled to the hub via a universal joint. The covered suspension arm structure is characterized in that the knuckle support portion of the suspension arm is formed of a plate member that extends from the rim of the wheel to the inside of the vehicle body and covers the lower portion of the boot.
According to the present invention, the knuckle support portion of the suspension arm is formed of the plate member that extends from the wheel rim to the inside of the vehicle body and covers the lower portion of the boot, so that the knuckle support portion can protect the boot from flying stones and obstacles. it can. Further, as compared with the case where a separate outboard side boot cover is provided, an increase in the number of parts and an increase in weight can be suppressed, and a complicated structure of the suspension arm can be avoided.

  In this case, the suspension arm includes a pipe member that is swingably supported by the frame, and the knuckle support portion is joined to the pipe member and extends between the pipe member and the rim. It is preferable. According to this configuration, since the knuckle support portion extends between the pipe member and the rim that are swingably supported by the frame, it is possible to reliably cover and protect the lower part of the boot that protrudes the rim of the wheel. it can.

  In this case, it is preferable that a cushion unit is interposed between the suspension arm and the frame, and the knuckle support portion covers a lower portion of the cushion unit. According to this configuration, since the knuckle support portion covers the lower part of the lower end portion of the cushion unit, both the boot and the cushion unit can be protected by the knuckle support portion.

In the present invention, the knuckle support portion of the suspension arm is formed of a plate member that extends from the wheel rim to the inside of the vehicle body and covers the lower portion of the boot, thereby avoiding the complexity of the structure of the suspension arm and increasing the number of parts. And increase in weight can be suppressed.
Further, since the knuckle support portion extends between the pipe member and the rim that are swingably supported by the frame, it is possible to reliably cover and protect the lower portion of the boot that protrudes the rim of the wheel.
Moreover, since the knuckle support part covers the lower end of the cushion unit, both the boot and the cushion unit can be protected by the knuckle support part.

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. In the description, descriptions of directions such as front and rear, right and left and up and down are for the vehicle body.
FIG. 1 is a side view of a saddle-ride type vehicle, and FIG. 2 is a plan view of the same. The saddle-ride type vehicle 1 is a four-wheeled vehicle classified as an ATV (All Terrain Vehicle) vehicle (a rough terrain vehicle), and is suitable for agriculture, livestock farming, hunting, safety monitoring, etc. or for leisure use. The left and right front wheels 2 and rear wheels 3, which are relatively large-diameter low-pressure balloon tires, are provided on the front and rear of a compact and lightweight vehicle body, ensuring a large minimum ground clearance and improving the running ability of rough terrain. Yes.
The saddle-ride type vehicle 1 has a body frame 4, and left and right front wheels 2 are suspended at a front portion of the body frame 4 via an independent suspension (double wishbone) type front suspension 57. The left and right rear wheels 3 are also suspended at the rear via a rear suspension 81 of the same independent suspension (double wishbone) type.

  The vehicle body frame 4 has a frame body 4a that extends substantially in the front-rear direction of the vehicle body. The frame body 4a is formed by joining a plurality of types of steel materials by welding or the like, and the left and right upper pipes 41 and the lower pipe 42 are mainly formed as a pair of left and right closed loop structures, and these are joined via a plurality of cross members. Thus, a box structure that is long in the front-rear direction is formed at the center in the vehicle width direction. The upper pipe 41 includes an upper inclined portion 41a extending gently inclined downward in the vehicle body longitudinal direction, and a front inclined portion 41b extending obliquely forward and downward from the front end portion of the upper inclined portion 41a, and the lower pipe 42 includes an upper pipe. 41 is connected to the lower end of the front inclined portion 41b and extends substantially horizontally in the longitudinal direction of the vehicle body.

  The front portion of the front inclined portion 41b of the upper pipe 41 and the lower pipe 42 are connected by a pair of left and right front connecting inclined portions 46 and a pair of left and right front subpipes 47 that are inclined rearwardly. The lower pipe 42 is connected by a pair of left and right rear sub pipes 62 that extend obliquely upward from the lower pipe 42 so as to form an obtuse angle thereto. A pair of left and right rear cross members 63 are attached between the rear sub pipe 62 and the upper pipe 41.

  The front lower pipe 45 at the front portion of the lower pipe 42 extends forward of the vehicle body, and a front protector 34 is connected to the front end portion thereof. The front protector 34 also serves as a carry pipe that supports the front carrier 35. A step bar 56 is provided at a substantially central portion in the front direction of the lower pipe 42, and the step bar 56 and a step board (not shown) below the step bar 56 constitute an occupant step.

  The left and right front inclined portions 41 b described above are joined to the front end portion of the front lower pipe 45, and the front inclined portion 41 b extends obliquely rearward and the upper end portion is continuous with the front end portion of each upper pipe 41. is doing. A cross member 51 is provided between the left and right front inclined portions 41b, and cross members 53 and 54 are provided between the left and right front lower pipes 45 with a space in the front-rear direction. A cross member 52 is also provided between 46. The cross members 51 to 54 ensure a sufficient frame rigidity around the front, and the cross members 52, 53, and 54 also serve as support members for supporting the front wheel side final reduction gear 11.

  A front upper arm (not shown) and a front lower arm (not shown) constituting a pair of left and right front suspension arms are supported by the cross members 51 to 54 so as to be swingable up and down. More specifically, the upper and lower cross members 51 and 52 are pivotally supported so that the front and rear sides of the front upper arm (not shown) can swing up and down, and the lower cross members 53 and 54 are supported. The front and rear of the front lower arm (not shown) are pivotally supported so that they can swing up and down. A pair of left and right knuckles (not shown) are pivotally supported at the distal ends of the left and right upper arms and the lower arms, and the hubs of the left and right front wheels 2 are rotatably supported by both knuckles. The upper end of a pair of left and right front cushion units 58 is supported between the front member 57 and the cross member 55, and thereby a front suspension 57 for suspending the front wheel 2 is formed.

The rear part of the lower pipe 42 and the rear cross member 63 are connected by a pair of left and right rear members 64 extending in the vertical direction, and a pair of left and right closed loop structures are mainly formed using the lower pipe 42, the rear sub pipe 62, the rear cross member 63, and the rear member 64. A box structure 60 that supports the rear wheel side final reduction gear 12 is formed. A cross member 69 is provided between the rear cross members 63, a cross member 67 is provided between the rear portions of the lower pipe 42, and a cross member 68 is provided between the lower end portions of the rear member 64. These cross members 67 to 69 ensure sufficient frame rigidity around the rear.
As shown in FIG. 3, upper portions of a pair of left and right rear cushion units 80 are supported between the upper pipe 41 and the rear cross member 63 via a bracket 70, and a pair of left and right rear suspensions 81 including the rear cushion unit 80 are supported. Are formed on the left and right of the box structure 60.

  In this configuration, as shown in FIGS. 1 and 2, an engine 5 as a prime mover composed of, for example, a water-cooled two-cylinder engine is mounted substantially at the center of the body frame 4, and the engine 5 is a crank that supports a crankshaft or the like. A so-called vertical layout is provided in which a case 6 and a cylinder portion 7 connected to the crankcase 6 are provided, and the rotation axis of the crankshaft is along the vehicle front-rear direction. The crankcase 6 also serves as a transmission case that houses the transmission. From the front and rear of the crankcase 6, front and rear propeller shafts 8 and 9 connected to the transmission in the crankcase 6 are respectively forward. And derived backwards.

  Each propeller shaft 8, 9 has a front wheel side final reduction device 11, a rear wheel side final reduction device 12, and a drive shaft extending to the left and right of these final reduction devices 11, 12 on the lower front side and the lower rear side of the vehicle body frame 4. (Drive shafts) 13 and 14 are connected to the front wheels 2 and the rear wheels 3 so as to be able to transmit power, and rotational power from the engine 5 is transmitted to the propeller shafts 8 and 9 via transmissions in the crankcase 6. Is transmitted to the front wheels 2 and the rear wheels 3 via the final reduction gears 11 and 12 and the drive shafts 13 and 14.

  A cylinder head portion 20 is connected to an upper portion of the cylinder portion 7 of the engine 5, and a throttle body 21 is provided above the cylinder head portion 20. An air cleaner case 22 is connected to the throttle body 21, and these constitute an intake system of the engine 5. Two exhaust pipes 23 are connected to one side (left side surface portion) of the cylinder head portion 20 of the engine 5 so as to correspond to the two cylinders of the engine 5. These exhaust pipes 23 extend to the left from the left side surface portion of the cylinder part 7, bend and extend to the rear of the engine, and then merge at a junction pipe 26 located on the left side of the boundary between the crankcase 6 and the cylinder part 7. Then, after extending rearward from here, it is connected to a silencer 24 that is inclined obliquely upwardly toward the left side of the rear part of the vehicle body, and these constitute an exhaust system of the engine 5.

  As shown in FIGS. 1 and 2, at the center of the vehicle body frame 4 in the vehicle width direction, an engine cooling radiator 25, a blower fan 25a, a shroud 25b, a front cushion unit 58, a steering shaft 27, and an air cleaner case are sequentially arranged from the front side of the vehicle body. 22, a throttle body 21, a saddle-ride type seat 29, and a fuel tank 28 are provided. A bar-type handle 30 positioned obliquely above the air cleaner case 22 is attached to the upper end portion of the steering shaft 27, and an electric power steering mechanism 91 and a front wheel steering mechanism 31 are connected to the lower end portion of the steering shaft 27. Yes.

The front part of the body frame 4 includes a resin body cover 32 that covers the front part of the vehicle body including the air cleaner case 22 and the throttle body 21 from above, and a resin front that covers both front wheels 2 from the top to the rear. A fender 33, and a front protector 34 and a front carrier 35 mainly made of steel are provided. Further, at the rear part of the vehicle body frame 4, a resin-made rear fender 36 that covers both the rear wheels 3 from the front to the top and a rear carrier 37 mainly made of steel are provided.
In this configuration, the engine 5 is positioned between the front wheel 2 and the rear wheel 3 suspended from the frame 4, and in particular, the center of the cylinder portion 7 of the engine 5 (approximately the center between the cylinders) is closer to the front wheel 2. It is provided so that it may be located in. In the saddle-ride type vehicle, when the position of the seat 29 is determined, the layout of the engine 5 is determined accordingly. This is because the seating portion of the seat 29 is low and the engine 5 is disposed in front of the seating portion.

  The engine 5 includes a crankcase 6 and a cylinder portion 7 projecting upward from the crankcase 6. The crankcase 6 is provided with a vertical crankshaft extending in the longitudinal direction of the vehicle body, and an ACG at the front end of the crankshaft. (AC generator) 190 is connected, and a power transmission system member 200 including a torque converter and the like is connected to the rear end of the crankshaft. That is, the engine 5 is arranged with the ACG 190 facing the vehicle body front side and the power transmission system member 200 facing the vehicle body rear side. A front wheel side final reduction device 11 is located on the front side of the engine 5, and a rear wheel side final reduction device 12 is located on the rear side. The distance from the engine 5 to each of the final reduction devices 11, 12 is determined by the rear wheel. The distance to the side final reduction gear 12 is set to be long.

  The ACG 190 and the power transmission system member 200 project in the front-rear direction of the engine from the cylinder portion 7, and the rearward projecting width W <b> 1 of the power transmission system member 200 is larger than the forward projecting width W <b> 2 of the ACG 190. An oil tank 92 for storing engine oil is provided on the upper part of the power transmission system member 200 projecting rearward, and a battery 93 is disposed on the oil tank 92.

  As shown in FIG. 3, a brake caliper 9 b that presses a pad against a brake disk 9 a that is coaxially fixed to the propeller shaft 9 for driving the rear wheel 3 is supported on the front side of the rear wheel side final reduction gear 12. 3, reference numerals 71 and 72 are upper arm support portions for supporting a rear upper arm 82 (described later) of the rear suspension 81, and reference numerals 73 and 74 are lower arm supports for supporting a rear lower arm 83 (described later) of the rear suspension 81. Reference numeral 74 denotes a stabilizer support that supports a rear stabilizer (not shown).

FIG. 4 is a view showing the rear suspension 81. Since the left and right rear suspensions 81 have a bilaterally symmetric structure, the rear suspension 81 for suspending one rear wheel 3 will be described below.
The rear suspension 81 includes a rear upper arm 82 and a rear lower arm 83 constituting a rear suspension arm, and a base end portion of the rear upper arm 82 is vertically moved to the vehicle body frame 4 via upper arm support portions 71 and 72 shown in FIG. The rear end of the rear lower arm 83 is supported by the body frame 4 via the lower arm support portions 73 and 74 shown in FIG.

  A knuckle 84 is connected to the tips of the rear upper arm 82 and the rear lower arm 83, and a hub 86 is rotatably supported on the knuckle 84 via a bearing 85, and the rear wheel 3 is outside the hub 86 (outside the vehicle body). The wheel 3a is connected. The rear lower arm 83 is connected to the front end of the rear cushion unit 80, and the rear wheel 3 is swingably and independently suspended by these. Seal bearings are used for the bearings 85 that support the hub 86, which eliminates the need for a seal between the knuckle 84 and the wheel 3a of the rear wheel 3 and a seal between the knuckle 84 and the axle 87 described below. It is said that.

  An axle 87, to which the drive shaft 14 is connected via a universal joint 88a, is provided inside the hub 86 (inward of the vehicle body), whereby the power of the engine 5 is transferred from the rear wheel side final reduction gear 12 to the drive shaft. 14 is transmitted to the axle 87 and the hub 86, and the rear wheel 3 is rotationally driven. The drive shaft 14 is also connected to the rear wheel side final reduction gear 12 via a universal joint 88b. The universal joints 88a and 88b are connected to the input side (rear wheel side final reduction device 12 side) and the output side ( It is composed of a constant velocity joint that equalizes the speed of the rear wheel 3 side.

  The connecting portions between the universal joints 88a and 88b at both ends of the drive shaft 14 and the drive shaft 14 are covered with rubber or resin boots 89a and 89b, respectively. The boot 89a on the rear wheel 3 side protrudes from the rim 3b of the wheel 3a to the vehicle body inward side so as to cover the universal joint 88a and the tip end portion of the drive shaft 14, and also on the rear wheel side final reduction gear 12 side. The boot 89b protrudes outward from the lower pipe 42 to cover the universal joint 88b and the base end portion of the drive shaft 14.

5 and 6 are views showing the rear lower arm 83. FIG. The rear lower arm 83 includes a bent tube 100 that is a pipe member that is bent in a substantially U shape, and a knuckle support portion (also referred to as a pivot portion) 110 that supports the knuckle 84.
As shown in FIG. 6B, the bent tube 100 includes a front arm 101, a rear arm 102 disposed behind the front arm 101, and a cross member 103 passed between the front arm 101 and the rear arm 102. And. Bolt insertion portions 101a and 102a having through holes substantially in the longitudinal direction of the vehicle body are respectively attached to the end portions of the front arm 101 and the rear arm 102, and these bolt insertion portions 101a and 102a are connected to the lower arm as shown in FIG. The support portions 72 and 73 are connected to each other via long-axis bolts 75 and 76. Here, the shaft portions of the long bolts 75 and 76 are provided with bulging portions 75a and 76a, and the bulging portions 75a and 76a are supported by the lower arm support portions 72 and 73, whereby the rear lower arm 83 is The long shaft bolts 75 and 76 are supported so as to be swingable up and down and tiltable back and forth about the axis of the long bolts 75 and 76.

The front arm 101 is provided with an arm side stabilizer support portion 101b that supports the stabilizer together with a stabilizer support portion 79 provided on the lower pipe 42. When the left and right rear wheels 3 are moved in the opposite phase by the stabilizer, the rear lower arm 83 is mounted. The movement of the vehicle can be suppressed to suppress the tilt of the vehicle body (rolling).
A bracket 104 is attached to the rear arm 102, and bolt holes 104a and 103a are provided in the bracket 104 and the cross member 103. The bolt holes 104a and 103a are used for inboard boot cover 120 (FIG. 5) is attached. As shown in FIG. 7, the inboard side boot cover 120 is a resin plate member that covers the boot 89 b on the base end side of the drive shaft 14 from below. The boot 89b and the universal joint 88b in the boot 89b are protected from obstacles.

  As shown in FIGS. 6A to 6C, the knuckle support portion 110 is formed of a press-molded metal plate member, and the base end portion thereof is welded to the distal end portion of the bent tube 100 or the like. Be joined. As shown in FIG. 7, the tip end portion 111 of the knuckle support portion 110 is formed in a substantially U-shaped cross section that opens upward with a space in the vehicle body front-rear direction, and a side wall 111 a having a space in the vehicle body front-rear direction. As shown in FIG. 5, the lower end portion of the knuckle 84 and the lower end portion of the rear cushion unit 80 are arranged between 111 b side by side in the longitudinal direction of the vehicle body. The lower ends of the knuckle 84 and the rear cushion unit 80 are connected to the knuckle support portion 110 via a long shaft bolt 113 that passes between the side walls 111a and 111b. The long shaft bolt 113 is connected to the knuckle support portion 110 by a nut 114. Fixed.

  The base end portion 120 of the knuckle support portion 110 is formed in a central convex cross-sectional shape in which a substantially central portion 120a in the vehicle longitudinal direction rises upward from the tip end portion 111 toward the vehicle body center side. In the knuckle support portion 110, the base end portion of the central portion 120a is welded to the upper side of the bent tube 100, and the front and rear portions 120b and 120c sandwiching the central portion 120a are welded to the lower side of the bent tube 100. Is done. Accordingly, the base end portion 120 of the knuckle support portion 110 is joined in a state where the bending tube 100 is sandwiched from above and below, and the knuckle support portion 110 and the bending tube 100 can be joined with high strength. Moreover, since the knuckle support part 110 is formed in the cross-sectional shape which has an unevenness | corrugation, a section modulus is high and the rigidity of the knuckle support part 110 can fully be ensured.

  When the rear wheel 3 is connected to the hub 86 supported by the knuckle 84, the knuckle support portion 110 extends between the rim 3b of the wheel 3a and the bent tube 100 as shown in FIG. As shown in FIG. 7, the lower portion of the boot 89 a on the tip end side of the drive shaft 14 and the lower end portion of the rear cushion unit 80 are covered. Therefore, the knuckle support portion 110 not only functions as a part of the rear lower arm 83, but also connects the boot 89a, the universal joint 88b in the boot 89b, and the rear cushion unit 80 from a stepping stone or an obstacle from the front or lower side of the vehicle body. The function of the outboard side boot cover to protect can be combined.

  As described above, in the present embodiment, the knuckle support portion 110 of the rear lower arm 83 (rear suspension arm) is formed of a plate member that extends from the rim 3b of the wheel 3a to the inside of the vehicle body and covers the lower portion of the boot 89a. The boot 89a can be protected without separately providing an outboard side boot cover that covers the 89a from below. For this reason, compared with the case where a separate outboard boot cover is provided, an increase in the number of parts and an increase in weight can be suppressed, and a space for attaching the outboard boot cover can be secured. Since there is no need to provide a bracket for attaching the boot cover, the structure of the rear lower arm 83 can be avoided.

  In addition, since the knuckle support portion 110 supports the knuckle 84 and the lower end portion of the rear cushion unit 80 via a common shaft member (long shaft bolt 113), it is necessary to separately provide a shaft member for the rear cushion unit 80. This also prevents an increase in the number of parts and an increase in weight. Further, since this knuckle support portion 110 also covers the lower portion of the rear cushion unit 80 inserted between the rear lower arm 83 and the vehicle body frame 4, it is possible to protect the rear cushion unit 80 as well.

As mentioned above, although this invention was demonstrated based on one Embodiment, it is clear that this invention is not limited to this. For example, in the above-described embodiment, the case where the knuckle support portion 110 is formed of a metal plate member has been described. However, the present invention is not limited thereto, and the knuckle support portion 110 may be formed of a plate member of a rigid material other than a metal material such as synthetic resin. Is possible.
In the above-described embodiment, the case where the present invention is applied to the suspension arm of the rear wheel 3 has been described. However, the present invention is not limited thereto, and the present invention may be applied to the suspension arm of the front wheel 2. . Further, the present invention may be applied not only to the above-described double wishbone type suspension but also to other types of suspension. Furthermore, in the above-described embodiment, the case where the present invention is applied to the suspension arm structure of an ATV (rough terrain vehicle) has been described. However, the present invention is not limited to this and can be widely applied to the suspension arm structure of vehicles other than the ATV. is there.

1 is a side view of a saddle-ride type vehicle to which a suspension arm structure according to the present invention is applied. It is a top view of a saddle-ride type vehicle. It is a rear side view of a saddle-ride type vehicle. It is a figure which shows a rear suspension with the periphery structure. It is a figure which shows a rear lower arm with the periphery structure. (A) is the figure which looked at a part of rear lower arm from the front, (B) is the top view of a rear lower arm, (C) is the figure which looked at the rear lower arm from back. It is a perspective view which shows a rear lower arm with the periphery structure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Saddle-ride type vehicle 2 Front wheel 3 Rear wheel 3a Wheel 3b Rim 4 Body frame 5 Engine 13, 14 Drive shaft (drive shaft)
80 Rear cushion unit 81 Rear suspension 82 Rear upper arm 83 Rear lower arm 84 Knuckle 85 Bearing 86 Hub 88a, 88b Universal joint 87 Axle 89a, 89b Boot 100 Bending pipe (pipe member)
101 Front arm 102 Rear arm 110 Knuckle support 120 Inboard boot cover

Claims (3)

The left and right wheels are independently suspended in a swingable manner on the frame via a suspension arm, each wheel has a drive shaft that transmits power from the engine, and a hub connected to the wheel of the wheel is connected to a hub via a knuckle. In the suspension arm structure in which the knuckle support portion of the suspension arm is connected, the drive shaft is connected to the axle connected to the hub via a universal joint, and the connection portion is covered with a boot.
A suspension arm structure characterized in that the knuckle support portion of the suspension arm is formed of a plate member that extends from the rim of the wheel to the inside of the vehicle body and covers the lower portion of the boot.   The suspension arm includes a pipe member swingably supported by the frame, and the knuckle support portion is joined to the pipe member and extends between the pipe member and the rim of the wheel. The suspension arm structure according to claim 1, wherein:   The suspension arm structure according to claim 1 or 2, wherein a cushion unit is interposed between the suspension arm and the frame, and the knuckle support portion covers a lower portion of the cushion unit.

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