JP2011005932A - Mounting structure of shock absorber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mounting structure of a shock absorber, which suppresses the vibrations of a cargo bed, without increasing weight and cost.SOLUTION: Each of right and left vehicular shock absorbers 11 includes an outer cylinder mounting part 18b coupled to the lower end of a shock absorber mounting member 8, and a rod mounting part 17b coupled to the mounting part 3c of a leaf spring 3, and attenuates the vibrations of a chassis frame 2 to a rear axle 4. Each of right and left shock absorbers 12 for cargo beds includes a rod mounting part 19b coupled to a cargo bed side mounting part 15, and an outer cylinder mounting part 20b coupled to the upper end of a shock absorber mounting member 8, and attenuates the vibrations of the cargo bed 9 to the chassis frame 2.

Description

  The present invention relates to a shock absorber mounting structure for a vehicle provided with a vibration isolation mechanism between a cargo bed and a chassis frame.

  In Patent Document 1, a cab and a loading platform are arranged side by side in the front-rear direction on a chassis frame, and the front side of the loading platform bottom is rotatably attached to the chassis frame via a hinge in a pitching direction. There is described a truck bed anti-vibration structure in which movement is restricted and a rear side end of a bed bottom is attached to a chassis frame via an air spring. In this truck bed vibration-proof structure, a shock absorber is interposed in parallel with the air spring.

JP 2008-1345 A

  In the conventional load-carrying vibration isolating structure, the air spring and the shock absorber are supported by a substantially plate-like support portion protruding in the vehicle width direction on the rear side of the chassis frame. Therefore, the input load from the carrier to the air spring and the shock absorber is concentrated on the support portion, and the support portion is required to have sufficient rigidity to withstand the concentration of the load. Here, the rigidity of the support part can be increased by increasing the thickness of the support part itself or by applying a reinforcing structure to the support part. However, in any case, an increase in weight or an increase in cost is caused. .

  Therefore, an object of the present invention is to provide a shock absorber mounting structure capable of suppressing the vibration of the cargo bed without causing an increase in weight or cost.

  In order to achieve the above object, a shock absorber mounting structure according to the present invention includes a pair of left and right chassis frames, a cargo bed, a pair of left and right air spring support members, a pair of left and right air springs, and a pair of left and right leaf springs. A pair of left and right shock absorber mounting members, a pair of left and right first shock absorbers, and a pair of left and right shock absorbers.

  The left and right chassis frames extend along the longitudinal direction of the vehicle. The loading platform is disposed above the left and right chassis frames, the front end side is rotatably supported by the left and right chassis frames, and the rear end side is rotatable in the vertical direction around the front end side. The left and right air spring support members project outward in the vehicle width direction from the rear ends of the left and right chassis frames, respectively, and face the lower surfaces of the left and right rear end corners of the cargo bed. The left and right air springs are interposed between the left and right rear end corners of the loading platform and the left and right air spring support members, and support the left and right rear end corners from below. The left and right leaf springs are respectively attached along the front-rear direction below the rear portions of the left and right chassis frames, and support the axle so as to be movable up and down. The left and right shock absorber mounting members are respectively fixed to the left and right chassis frames above the left and right leaf springs.

  Each of the left and right first shock absorbers has an upper end connected to the shock absorber mounting member and a lower end connected to the leaf spring side, and attenuates vibration of the chassis frame relative to the axle. Each of the left and right second shock absorbers has an upper end connected to the loading platform side and a lower end connected to the shock absorber mounting member, and attenuates the vibration of the loading platform relative to the chassis frame.

  In the above configuration, the vibration of the chassis frame relative to the axle is suppressed by the leaf spring and the first shock absorber when the vehicle is traveling. Further, the movement on the rear end side of the cargo bed is limited to the vertical direction (pitching direction), and the vertical vibration on the rear edge side of the cargo bed with respect to the chassis frame is suppressed by the air spring and the second shock absorber.

  Further, since the input load to the air spring and the second shock absorber from the rear end side of the loading platform is transmitted to the air spring support member and the shock absorber mounting member, the air spring support member is connected to the input load from the air spring. It is possible to set to a minimum strength that can withstand only.

  Further, since the lower end portion of the second shock absorber is connected to the shock absorber mounting member together with the upper end portion of the first shock absorber, the bracket for connecting the lower end portion of the second shock absorber to the chassis frame side. Etc. need not be provided separately.

  Further, since the shock absorber mounting member inherently has a rigidity that can withstand the load input from the leaf spring via the first shock absorber, the shock absorber mounting member shocks the reinforcement for securing the mounting strength of the second shock absorber. There is no need to apply to the absorber mounting member.

  Therefore, the second shock absorber can be attached without causing an increase in weight or cost.

  The upper end and the lower end of the second shock absorber may be rotatably connected to the cargo bed side and the shock absorber mounting member, respectively, and the second shock absorber may be inclined with respect to the vertical direction. .

  In the above configuration, the distance of the second shock absorber is greater than the distance between the shock absorber mounting member and the loading platform when the loading platform is closest to the shock absorber mounting member (hereinafter referred to as the shortest distance between the loading platform and the shock absorber mounting member). Even when the shortened length is long, since the second shock absorber is inclined with respect to the vertical direction, there is no need to separate the cargo bed and the shock absorber mounting member in the vertical direction. The second shock absorber can be disposed in a region where the height of the second shock absorber is limited.

  In addition, when the length of the first shock absorber when shortened is longer than the shortest distance between the loading platform and the shock absorber mounting member, the same shock absorber as the first shock absorber can be used as the second shock absorber. . Therefore, it is possible to share parts between the first shock absorber and the second shock absorber.

  According to the present invention, the vibration of the cargo bed can be suppressed by the structure that suppresses the increase in weight and cost.

It is a schematic plan view which shows the rear part structure of a vehicle. It is a schematic rear view which shows the attachment state of an air spring. FIG. 3 is a side view taken along arrow III in FIG. 1.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. 1 is a schematic plan view showing a rear structure of a vehicle, FIG. 2 is a schematic rear view showing an attachment state of an air spring, and FIG. 3 is a side view taken along the arrow III in FIG. In the following description, the front-rear direction indicates the front-rear direction of the traveling direction of the vehicle, and the inner-outer direction indicates the inner-outer side in the vehicle width direction. Moreover, right and left means right and left in the state which faced the vehicle front. Moreover, in FIG. 2, illustration of the shock absorber for loading platforms is omitted.

  As shown in FIGS. 1 to 3, the vehicle 1 according to this embodiment includes a pair of left and right chassis frames 2, a pair of left and right leaf springs 3, a rear axle (axle) 4, a pair of left and right rear wheels 5, and a pair of left and right sides. Hinge support member 6, a pair of left and right air spring support members 7, a pair of left and right shock absorber mounting members 8, a load carrier 9, a pair of left and right air springs 10, and a pair of left and right vehicle body shock absorbers (first shock absorbers) 11. A pair of left and right loading platform shock absorbers (second shock absorber) 12 and a pair of left and right stoppers 13 are configured.

  The left and right chassis frames 2 are arranged along the vehicle front-rear direction on both left and right sides in the vehicle width direction. A cab (not shown) is placed on the front end of the left and right chassis frame 2, and the driver's seating position of the cab is generally located above the engine (not shown).

  The left and right leaf springs 3 are stacked leaf springs configured by overlapping a plurality of substantially rectangular plate members in the vertical direction. Since the left and right leaf springs 3 have a substantially bilaterally symmetric structure, the configuration of the right leaf spring 3 will be described, and the description of the configuration of the left leaf spring (not shown) will be omitted.

  The right leaf spring 3 extends in the front-rear direction along the right chassis frame 2, and the front end portion 3 a and the rear end portion 3 b are connected to the rear lower end portion of the right chassis frame 2. A mounting portion 3c having a substantially semicircular shape in side view is provided at a substantially central portion in the front-rear direction of the right leaf spring 3.

  The rear axle 4 extends in the vehicle width direction below the left and right chassis frames 2 and is supported in a substantially central portion in the front-rear direction of the left and right leaf springs 3 so as to be movable up and down behind the mounting portion 3c. The rear wheels 5 are provided on both ends of the rear axle 4 in the vehicle width direction so as to be arranged side by side in the vehicle width direction.

  The left and right hinge support members 6 are substantially trapezoidal plate-like members when viewed from above, and are located behind the cab and in front of the rear axle 5, with the inner ends in the vehicle width direction of the left and right chassis frames 2 in the vehicle width direction. Are joined to each other.

  The left and right air spring support members 7 are substantially trapezoidal plate-like members as viewed from above, which are respectively arranged at the rear ends of the left and right chassis frames 2 and behind the rear axle 4. Since the left and right air spring support members 7 have a substantially bilaterally symmetric structure, the configuration of the right air spring support member 7 will be described, and the description of the configuration of the left air spring support member 7 will be omitted.

  The right air spring support member 7 is joined to the vehicle width direction outer side surface of the right chassis frame 2 with the upper surface disposed below the upper surface of the right chassis frame 2. . The right air spring support member 7 has a vertical width at the inner end in the vehicle width direction that is set larger than the vertical width at the outer end in the vehicle width direction, and the vertical direction from the outer end in the vehicle width direction toward the inner end. The width of

  The left and right shock absorber mounting members 8 are substantially rectangular plate-shaped members, and are disposed between the left and right hinge support members 6 and the left and right air spring support members 7 and in front of the mounting portions of the left and right leaf springs 3. The left and right chassis frames 2 are joined to the inner side surfaces in the vehicle width direction. The shock absorber mounting member 8 has sufficient rigidity to withstand a load input from the leaf spring 3 and the cargo bed 9 via a vehicle body shock absorber 11 and a cargo bed shock absorber 12 described later.

  The loading platform 9 has a substantially box shape, and is disposed behind the cab and above the left and right chassis frames 2. In the loading platform 9, the front end portion is positioned slightly above the left and right chassis frames 2, and the front lower end portions on both sides in the vehicle width direction are fixed to the hinge support member 6 via hinges 14. The rear end side of the loading platform 9 is rotated up and down (pitching direction) within a predetermined range around the hinge 14 by left and right air springs 10 and left and right loading platform shock absorbers 12 described later. In addition, a pair of left and right loading platform side mounting portions 15 having a substantially triangular shape when viewed from the side are provided at the rear end lower end portion of the loading platform 9 and behind the left and right shock absorber mounting members 8.

  The left and right air springs 10 each have an upper mounting portion 10 a, a lower mounting portion 10 b, and an air spring body 10 c, and between the left and right rear end corners of the cargo bed 9 and the left and right air spring support members 7. Has been placed. Since the left and right air springs 10 have a substantially bilaterally symmetric structure, the configuration of the right air spring 10 will be described, and the description of the configuration of the left air spring 10 will be omitted.

  The upper mounting portion 10 a is a substantially plate-like member, and is fixed to the lower end surface of the loading platform 9. The lower mounting portion 10 b is a substantially plate-like member, and is fixed to the upper end surface of the air spring support member 7. The air spring body 10c has a substantially cylindrical shape extending in the vertical direction between the upper mounting portion 10a and the lower mounting portion 10b, and is formed of rubber or the like and can hold compressed air therein. A pipe 16 is connected to the air spring body 10 c, and an air tank (not shown) for storing compressed air is connected to the other end of the pipe 16. The piping 16 is provided with a switching valve (not shown) that supplies air in the air tank to the air spring body 10c or exhausts air in the air spring body 10c.

  The left and right air springs 10 configured in this way are supplied with the air in the air tank to the air spring main body 10c to increase the air pressure in the air spring main body 10c, so that the air spring 10 itself extends in the vertical direction. 9 is separated from the chassis frame 2 by a predetermined distance. The left and right air springs 10 support the left and right rear end corners of the loading platform 9 from below and utilize the elasticity of the air in a state where the loading platform 9 is separated from the chassis frame 2. The vertical vibration of the loading platform 9 with respect to is suppressed. 2 shows a state in which the air in the air spring main body 10c is exhausted and the loading platform 9 is brought into contact with the upper surface of a stopper 13, which will be described later, such as when the vehicle 1 is parked. In FIG. The state in which air is supplied into the air spring body 10c and the carrier 9 is separated from the chassis frame 2 by a predetermined distance is shown.

  The left and right vehicle body shock absorbers 11 each have a piston rod 17 and an outer cylinder 18, and are arranged between the left and right shock absorber mounting members 8 and the mounting portions 3 c of the left and right leaf springs 3, respectively. Inclined with respect to direction. Since the left and right vehicle body shock absorbers 11 have a substantially bilaterally symmetric structure, the configuration of the right vehicle body shock absorber 11 will be described, and the description of the left vehicle body shock absorber (not shown) will be omitted. To do.

  The piston rod 17 is provided at a substantially cylindrical piston rod main body 17a extending in a rearward and downward direction between the chassis frame 2 and the leaf spring 3, and at the other end (lower end in FIG. 3) of the piston rod main body 17a. And a substantially annular rod attachment portion (lower end portion) 17b that is rotatably connected to the attachment portion 3c of the leaf spring 3.

  The outer cylinder 18 includes a substantially cylindrical outer cylinder body 18a that is slidably inserted through the piston rod body 17a, and a lower end of the shock absorber mounting member 8 provided at one end (the upper end in FIG. 3) of the outer cylinder body 18a. And a substantially annular outer cylinder mounting portion (upper end portion) 18b that is rotatably connected to the portion.

  In the vehicle body shock absorber 11 configured as described above, the piston rod 17 and the outer cylinder 18 move relative to each other in response to an external force input, and the piston rod 17 and the outer cylinder 18 move relative to each other. A resistance force is generated in a direction to prevent the relative movement, and the vibration of the chassis frame 2 with respect to the rear axle 4 is attenuated by the resistance force. The minimum length of the shock absorber 11 for the vehicle body is the distance between the loading platform 9 and the shock absorber mounting member 8 when the loading platform 9 comes closest to the shock absorber mounting member 8 (hereinafter referred to as loading platform 9 and shock absorber mounting). Longer than the shortest distance to the member 8).

  Each of the left and right cargo bed shock absorbers 12 includes a piston rod 19 and an outer cylinder 20. The left and right shock absorber mounting members 8 and the left and right cargo bed side mounting portions 15 are located above the left and right leaf springs 3. They are respectively arranged in between and inclined with respect to the vertical direction. Since the left and right loading platform shock absorbers 12 have a substantially bilaterally symmetrical structure, the configuration of the right loading platform shock absorber 12 will be described, and the description of the configuration of the left loading platform shock absorber 12 will be omitted.

  The piston rod 19 is provided at one end of the substantially cylindrical piston rod main body 19a extending between the cargo bed 9 and the chassis frame 2 so as to incline rearward and upward, and is rotatable to the loading platform side mounting portion 15. And a substantially annular rod attachment portion (upper end portion) 19b connected to the outer periphery.

  The outer cylinder 20 is rotatably connected to the substantially cylindrical outer cylinder main body 20a that is slidably inserted through the piston rod main body 19a and the upper end of the shock absorber mounting member 8 provided at the other end of the outer cylinder main body 20a. And a substantially annular outer cylinder mounting portion (lower end portion) 20b.

  In the shock absorber 12 for cargo bed configured as described above, the piston rod 19 and the outer cylinder 20 move relative to each other in response to an external force input, and the piston rod 19 and the outer cylinder 20 move relative to each other. A resistance force is generated in a direction to prevent the relative movement, and the vibration of the loading platform 9 with respect to the chassis frame 2 is attenuated by the resistance force.

  The length of the shock absorber 12 for the loading platform is set to the same length as that of the shock absorber 11 for the vehicle body when it is shortened. That is, the minimum length of the shock absorber 12 for the loading platform is set longer than the shortest distance between the loading platform 9 and the shock absorber mounting member 8. In addition, the movable range (stroke) of the carrier shock absorber 12 is set to be larger than the movable range of the carrier 9. It should be noted that the shock absorber 12 for the cargo bed connected to the cargo bed side mounting portion 15 and the shock absorber mounting member 8 does not need to be at the shortest time when the cargo bed 9 comes closest to the shock absorber mounting member 8, and When the absorber mounting member 8 and the loading platform 9 are farthest apart, it is not necessary to be at the maximum extension.

  The left and right stoppers 13 have a substantially rectangular prism shape when viewed from the side, and are formed of rubber. The left and right stoppers 13 are disposed between the left and right shock absorber mounting members 8 and the left and right air spring support members 7 and rearward of the loading platform side mounting portion 15, and are fixed to the upper end surfaces of the left and right chassis frames 2, respectively. Has been. The length of the stopper 13 in the vertical direction is set to be longer than the length when the air spring 10 is shortened. The stopper 13 supports the loading platform 9 from below when air is not supplied into the air spring body 10c, such as when the vehicle 1 is parked, or when air cannot be held in the air spring body 10c for some reason. (See FIG. 2). Further, the stopper 13 reduces the impact from the chassis frame 2 against the cargo bed 9 when the vehicle 1 travels in a state where air cannot be held in the air spring body 10c, and against the air spring 10 and the shock absorber 12 for the cargo bed. To prevent excessive loads.

  According to this embodiment, the vibration of the chassis frame 2 with respect to the rear axle 4 is suppressed by the leaf spring 3 and the vehicle body shock absorber 11 during vehicle travel. Further, the movement of the rear end side of the loading platform 9 is limited in the vertical direction, and the vertical vibration on the rear end side of the loading platform 9 with respect to the chassis frame 2 is suppressed by the air spring 10 and the shock absorber 12 for the loading platform.

  Moreover, since the input load to the air spring 10 and the shock absorber 12 for the cargo bed is transmitted from the rear end side of the cargo bed 9 to the air spring support member 7 and the shock absorber mounting member 8, the air spring support member 7 is It is possible to set a minimum strength that can withstand only an input load from the spring 10.

  Further, since the outer cylinder mounting portion 20b of the carrier shock absorber 12 is connected to the shock absorber mounting member 8 together with the outer cylinder mounting portion 18b of the vehicle body shock absorber 11, the outer cylinder mounting portion 20b of the shock absorber 12 for the cargo bed. There is no need to separately provide a bracket or the like for connecting the frame to the chassis frame 2 side.

  Further, since the shock absorber mounting member 8 inherently has rigidity capable of withstanding the load input from the leaf spring 3 via the vehicle body shock absorber 11, reinforcement or the like for ensuring the mounting strength of the shock absorber 12 for the cargo bed, etc. Need not be applied to the shock absorber mounting member 8.

  Therefore, the shock absorber 12 for the loading platform can be attached without causing an increase in weight or cost.

  Further, since the carrier shock absorber 12 is inclined with respect to the vertical direction, a shock absorber having a length shorter than the shortest distance between the carrier 9 and the shock absorber mounting member 8 is used as the carrier shock absorber 12. Even if it is used, it is not necessary to greatly separate the loading platform 9 and the shock absorber mounting member 8 in the vertical direction, and the loading platform shock absorber 12 can be disposed in a region where the vertical height is limited.

  Further, since the minimum length of the vehicle body shock absorber 11 is longer than the shortest distance between the loading platform 9 and the shock absorber mounting member 8, the same shock absorber as the vehicle body shock absorber 11 is used as the loading platform shock absorber 12. Can do. Therefore, it is possible to make the parts common between the vehicle body shock absorber 11 and the cargo bed shock absorber 12.

  In addition, although this embodiment demonstrated the case where the shock absorber 12 for loading platforms was inclined with respect to the perpendicular direction, the shock absorber 12 for loading platforms may be attached vertically.

  Further, a shock absorber different from the vehicle body shock absorber 11 may be used as the carrier shock absorber 12 without using the same shock absorber as the vehicle body shock absorber 11 as the carrier shock absorber 12.

  Moreover, although the case where the rod mounting portion 19b of the shock absorber for loading platform 12 is connected to the loading platform side mounting portion 15 and the outer cylinder mounting portion 20b is connected to the upper end portion of the shock absorber mounting portion 8 has been described, the shock absorber 12 for loading platform is described. May be connected upside down with the outer cylinder mounting portion 20b of the shock absorber 12 for loading platform 12 connected to the loading platform side mounting portion 15 and the rod mounting portion 19b connected to the upper end portion of the shock absorber mounting portion 8.

  As mentioned above, although the embodiment to which the invention made by the present inventor is applied has been described, the present invention is not limited by the discussion and the drawings that form part of the disclosure of the present invention according to this embodiment. That is, it should be added that other embodiments, examples, operation techniques, and the like made by those skilled in the art based on this embodiment are all included in the scope of the present invention.

  The present invention can be applied to a vehicle including an air spring and a shock absorber between a cargo bed and a chassis frame.

1 Vehicle 2 Chassis Frame 3 Leaf Spring 4 Rear Axle (Axle)
5 Rear wheel 7 Air spring support member 8 Shock absorber mounting member 9 Loading platform 10 Air spring 11 Shock absorber for vehicle body (first shock absorber)
12 Shock absorber for loading platform (second shock absorber)
17b Rod mounting part (lower end)
18b Outer tube mounting part (upper end)
19b Rod mounting part (upper end)
20b Outer tube mounting part (lower end)

Claims (2)

A pair of left and right chassis frames extending along the longitudinal direction of the vehicle;
A loading platform that is disposed above the left and right chassis frames, and whose front end side is rotatably supported by the left and right chassis frames, and whose rear end side is rotatable in the vertical direction around the front end side;
A pair of left and right air spring support members projecting outward in the vehicle width direction from the rear end portions of the left and right chassis frames and facing the lower surfaces of the left and right rear end corners of the cargo bed,
A pair of left and right air springs interposed between the left and right rear end corners of the cargo bed and the left and right air spring support members, and supporting the left and right rear end corners from below;
A pair of left and right leaf springs attached to the lower rear portions of the left and right chassis frames along the front-rear direction, and supporting the axle so as to move up and down;
A pair of left and right shock absorber mounting members respectively fixed to the left and right chassis frames above the left and right leaf springs;
A pair of left and right first shock absorbers each having an upper end portion connected to the shock absorber mounting member and a lower end portion connected to the leaf spring side to attenuate vibrations of the chassis frame relative to the axle;
A pair of left and right second shock absorbers each having an upper end connected to the cargo bed side and a lower end connected to the shock absorber mounting member, and attenuating vibration of the cargo bed relative to the chassis frame; Shock absorber mounting structure characterized by having. The shock absorber mounting structure according to claim 1,
An upper end and a lower end of the second shock absorber are rotatably connected to the cargo bed side and the shock absorber mounting member, respectively, and the second shock absorber is inclined with respect to the vertical direction. Shock absorber mounting structure characterized by this.

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