JP2011011636A - Vehicle deck structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle deck structure which suppresses movements of the deck in the back and forth directions and the right and left directions during a vehicle collision, and improves steering stability during turning of the vehicle, without hindering a vertical movement of the deck.SOLUTION: A shaft 10 is supported by the deck 9, and extends vertically beneath the deck 9. A deck movement regulation member 8 is supported by a chassis frame 2, and includes a hole portion for inserting the shaft 10; and a plurality of balls which contact with an outer peripheral surface of the shaft 10 inserted into the hole portion, at a plurality of circumferential locations, respectively, and which regulate the movements in the back and forth directions and the right and left directions of the shaft 10, and permit the vertical movement. The shaft 10 moves vertically in the hole portion while maintaining the contact state with the plurality of balls.

Description

  The present invention relates to a vehicle bed structure.

  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.

JP 2008-1345 A

  In the structure described in Patent Document 1, the hinge that supports the front side of the loading platform with respect to the chassis frame is a member for rotating the rear end side of the loading platform in the pitching direction. It is not intended to restrict the movement of directions. For this reason, for example, when a load ahead of the vehicle is input to the loading platform at the time of a vehicle collision, the hinge may be damaged, the loading platform may move forward with respect to the chassis frame, and the cab may be crushed.

  In general, as a characteristic of the air spring, since the spring constant in the front-rear and left-right directions is not as high as the spring constant in the up-down direction, the support rigidity in the front-rear and left-right directions is insufficient compared to the support rigidity in the up-down direction. For this reason, even if the loading platform is supported by the air spring, it is difficult to restrict the movement of the loading platform in the front-rear and left-right directions by the air spring in the event of a vehicle collision. In addition, there is a possibility that the loading platform moves to the left and right with respect to the chassis frame due to the inertial force at the time of turning of the vehicle, and the steering stability at the time of turning of the vehicle is impaired.

  Accordingly, the present invention provides a vehicle bed structure that can suppress the movement of the bed in the front-rear and left-right directions at the time of a vehicle collision and can improve the handling stability when the vehicle turns without hindering the vertical movement of the bed. With the goal.

  In order to achieve the above object, a cargo bed structure according to a first aspect of the present invention includes a pair of left and right chassis frames, a cargo bed, a cargo bed vibration suppressing means, a sliding member, and a cargo bed movement restricting member.

  The pair of left and right chassis frames extend along the front-rear direction of the vehicle. The loading platform is disposed above the left and right chassis frames. The loading platform vibration suppressing means is interposed between the left and right chassis frames and the loading platform, supports the loading platform movably with respect to the chassis frame, and suppresses vertical vibration of the loading platform. The sliding member is supported on the loading platform side and extends in the vertical direction below the loading platform. The carrier movement restricting member is supported on the chassis frame side, and is in contact with a through hole through which the sliding member is inserted, and an outer peripheral surface of the sliding member inserted through the through hole at a plurality of locations in the circumferential direction, respectively. And a plurality of rolling members that restrict movement in the left-right direction and allow movement in the up-down direction. The sliding member moves up and down through the through hole while maintaining a state in contact with the plurality of rolling members.

  In the above configuration, the movement of the sliding member in the front-rear and left-right directions is restricted by the contact between the outer peripheral surface of the sliding member and the plurality of rolling members of the loading platform movement restricting member, and the sliding member moves in the up-down direction in this state. . Since the plurality of rolling members rotate in the vertical direction when the sliding member moves up and down, the vertical movement of the loading platform with respect to the chassis frame is not hindered. Therefore, the vertical vibration generated in the loading platform during vehicle travel can be suppressed by the loading platform vibration suppressing means.

  In addition, since the movement of the loading platform in the front-rear and left-right directions is restricted, for example, when a load ahead of the vehicle is input to the loading platform in the event of a vehicle collision, the movement of the loading platform forward with respect to the chassis frame can be regulated. A living space can be secured. Further, even when inertial force at the time of turning of the vehicle is generated in the loading platform, the sliding member and the loading platform movement regulating member can regulate the movement of the loading platform in the front-rear and left-right directions with respect to the chassis frame. Stability can be improved.

  The vehicle bed structure according to the second aspect of the present invention is the vehicle bed structure according to the first aspect, and includes a support member.

  The support member rotatably supports one end side of the front end or the rear end of the cargo bed on the left and right chassis frames. The platform vibration suppression means includes a pair of left and right air springs arranged on the other end side of the front end and rear end of the left and right chassis frames and supporting the left and right corners of the load platform from below, and the left and right air springs, respectively. And a pair of left and right shock absorbers disposed in the vicinity for attenuating the vibration of the loading platform. The loading platform movement restricting member is disposed on the other end side of the left and right chassis frames. The other end side of the loading platform is rotatable in the vertical direction with the support member as the center. The sliding member has a curved shaft shape that extends along an arc passing through the through hole of the loading platform movement restricting member with the support member as a center.

  In the above configuration, the movement trajectory on the other end side of the cargo bed becomes an arc centered on the support member, and the sliding member extends along the movement trajectory on the other end side of the cargo bed through the through hole of the cargo bed movement restricting member. Move up and down. Therefore, even when the other end side of the cargo bed is rotated in the vertical direction around the support member, the vertical vibration of the other edge side of the cargo bed is not hindered without disturbing the vertical movement of the cargo bed with respect to the chassis frame. Can be suppressed by an air spring and a shock absorber.

  In addition, since the loading platform movement restricting members are respectively disposed on the left and right chassis frames, the rotational movement of the loading platform with respect to the chassis frames in the horizontal plane can be regulated.

  Further, since the loading platform movement restricting member is disposed on the other end portion side of the chassis frame on which the air spring is disposed, the other end portion side of the loading platform can be mechanically restrained when the vehicle turns, and the vehicle The movement of the other end side of the loading platform during turning can be reliably restricted.

  ADVANTAGE OF THE INVENTION According to this invention, the steering stability at the time of vehicle turning can be improved while it can suppress the movement of the loading platform in the front-back and left-right directions at the time of a vehicle collision, without disturbing the vertical movement of a loading platform.

1 is a schematic side view of a vehicle. It is a schematic top view of a vehicle. It is a schematic side view which shows the motion of a loading platform. It is a principal part perspective view of FIG. It is a VV arrow sectional view of Drawing 4.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. 1 is a schematic side view of the vehicle, FIG. 2 is a schematic top view of the vehicle, FIG. 3 is a schematic side view showing the movement of the loading platform, FIG. 4 is a perspective view of the main part of FIG. 1, and FIG. It is arrow sectional drawing. 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. In FIG. 2, the air spring 11 and the shock absorber 12 are not shown.

  As shown in FIGS. 1 to 5, the vehicle 1 according to this embodiment includes a pair of left and right chassis frames 2, a cab 3, a pair of left and right front wheels 4, a rear axle 5, a pair of left and right rear wheels 6, and a pair of left and right hinges. The support member 7, the pair of left and right loading platform movement restricting members 8, the loading platform 9, the pair of left and right shafts (sliding members) 10, the pair of left and right air springs (loading platform vibration suppressing means) 11, and the pair of left and right shock absorbers (loading platform vibration suppressing means) ) 12 etc.

  The left and right chassis frames 2 are disposed on both left and right sides in the vehicle width direction and extend in the vehicle front-rear direction. The cab 3 is placed on the upper front end of the chassis frame 2. The front wheel 4 is disposed below the cab 3 and is supported on the front end portion of the chassis frame 2 from above.

  The rear axle 5 is disposed rearward of the front wheel 4, extends in the vehicle width direction below the rear end of the chassis frame 2, and is supported from above on the chassis frame 2 via leaf springs (not shown). The rear wheels 6 are provided side by side in the vehicle width direction on both ends of the rear axle 5 in the vehicle width direction.

  The hinge support member 7 is a plate-like member having a substantially trapezoidal shape when viewed from above, is disposed behind the cab 3 and in front of the rear axle 5, and has an inner end in the vehicle width direction on an outer side in the vehicle width direction of the chassis frame 2. It is joined.

  The loading platform movement restricting member 8 has a bearing support portion 13 and a substantially annular bearing portion 14, and is disposed behind the rear axle 5 and at the rear end portion of the chassis frame 2.

  The bearing support portion 13 is a substantially plate-like member extending in the vehicle width direction, and the inner end portion in the vehicle width direction is joined to the outer surface of the chassis frame 2. The outer end portion in the vehicle width direction is formed in a substantially curved shape in which a substantially central portion in the front-rear direction is recessed toward the inner side in the vehicle width direction. Further, the bearing support portion 13 is set such that the length in the front-rear direction of the inner end portion in the vehicle width direction is longer than the length in the front-rear direction of the outer end portion in the vehicle width direction. The length is set longer than the length in the vertical direction of the outer end portion in the vehicle width direction.

  The bearing portion 14 includes a ball holding portion 15, a hole portion (through hole) 16, and a plurality of balls (rolling members) 17, and an outer peripheral edge portion is joined to the bearing support portion 13.

  The ball holding portion 15 has an outer wall portion 18 having a substantially rectangular cross section that defines the outer peripheral edge of the bearing portion 14, and a substantially rectangular cross section extending radially inward (center side in the radial direction) from the upper end portion of the outer wall portion 18. The upper wall portion 19, the lower wall portion 20 having a substantially rectangular cross section extending in the radial direction from the lower end portion of the outer wall portion 18, and the radially inward end from the radially inner end portion of the upper wall portion 19 inclined downward in the radial direction. The upper inner wall portion 21 has a substantially triangular cross section, and the lower inner wall portion 22 has a substantially triangular cross section that extends from the radially inner end of the lower wall portion 20 in an upwardly inclined direction in the radial direction. . The lower end of the upper inner wall portion 21 and the upper end of the lower inner wall portion 22 are spaced apart in the vertical direction, and a gap is formed between the lower end of the upper inner wall portion 21 and the upper end of the lower inner wall portion 22. Further, the ball holding portion 15 includes an inner surface 18a (radially inner surface) of the outer wall portion 18, a lower surface 19a of the upper wall portion 19, an upper surface 20a of the lower wall portion 20, and an inner surface (radially outer side of the upper inner wall portion 21). A ball housing space 23 is defined by a surface 21 a and an inner surface (radially outer surface) 22 a of the lower inner wall surface 22.

  The hole portion 16 is a through-hole formed at a substantially central portion in the radial direction of the ball holding portion 15. The hole portion 16 gradually increases in diameter from a substantially central portion in the vertical direction toward the upper end and the lower end. Moreover, the diameter of the upper end of a hole part and a lower end is set to the substantially same magnitude | size.

  The ball 17 is a spherical member and is disposed in the ball housing space 23 of the ball holding portion 15. The diameter of the ball 17 is set to be substantially the same as the distance between the lower surface 19 a of the upper wall portion 19 and the upper surface 20 a of the lower wall portion 20. The ball 17 is accommodated in the ball accommodating space 23, and the inner surface 18 a of the outer wall portion 18, the lower surface 19 a of the upper wall portion 19, the upper surface 20 a of the lower wall portion 20, the inner surface 21 a of the upper inner wall portion 21, and the lower inner wall portion 22. It can contact with the inner surface 22a of the ball and can rotate in the ball housing space 23 by an external force in such a state. In the state where the ball 17 is housed in the ball housing space 23, the inner end 17 a on the hole 16 side of the ball 17 is a hole from the gap between the lower end of the upper inner wall portion 21 and the upper end of the lower inner wall portion. Projecting to the part 16.

  The loading platform 9 has a substantially box shape, and is disposed behind the cab 3 and above the chassis frame 2. The loading platform 9 has a front end portion slightly spaced above the chassis frame 2, and a front lower end portion on both sides in the vehicle width direction is fixed to the hinge support member 7 via hinges (support members) 24. The rear end side of the loading platform 9 is supported by an air spring 11 which will be described later, and rotates in a vertical direction (pitching direction) within a predetermined range around the hinge 24.

  The shaft 10 is a shaft-shaped member having a circular cross section that is curved with a predetermined radius of curvature and extends in the vertical direction. The shaft 10 is inserted into the hole 16 of the loading platform movement restricting member 8, and the upper end is joined to the lower bottom surface of the rear portion of the loading platform 9. The radius of curvature of the shaft 10 is set to be substantially the same as the distance from the hinge 24 to the hole 16 of the loading platform movement restricting member 8, and the shaft 10 is an arc passing through the hole 16 of the loading platform movement regulating member 8 with the hinge 24 as the center. It extends along. The shaft 10 is inserted through the hole 16 of the loading platform movement restricting member 8, and the outer peripheral surface of the shaft 10 has inner ends 17 a (upper inner wall portions 21) of the balls 17 accommodated in the ball accommodating space 23. And a portion of the ball 17 protruding into the hole 16 through a gap between the lower end of the lower inner wall and the upper end of the lower inner wall portion) at a plurality of locations in the circumferential direction. The hole 16 is moved up and down.

  The air spring 11 is a substantially cylindrical member extending in the vertical direction, and is formed of rubber or the like and can hold compressed air therein. The air spring 11 is disposed in the vicinity of the loading platform movement restricting member 8 and between the left and right rear end corners of the loading platform 9 and the left and right chassis frames 2, and the upper end portion and the lower end portion thereof are the loading platform 9 and the chassis frame 2. And are fixed respectively. The air spring 11 supports the left and right rear end corners of the loading platform 9 from below and suppresses vertical vibration of the loading platform 9 relative to the chassis frame 2 by utilizing the elasticity of air.

  The shock absorber 12 has an upper end (for example, a piston rod, not shown) and a lower end (for example, an outer cylinder, not shown). The shock absorber 12 is disposed in the vicinity of the air spring 11, and an upper end portion and a lower end portion thereof are fixed to the cargo bed 9 and the chassis frame 2, respectively. The shock absorber 12 moves relative to the upper end and the lower end in response to an external force input. When the upper end and the lower end move relative to each other, the shock absorber 12 exerts a resistance force in a direction that prevents the relative movement. The vibration of the loading platform 9 relative to the chassis frame 2 is attenuated by this resistance force.

  According to the present embodiment, the movement locus on the rear end side of the loading platform 9 is an arc centered on the hinge 24, and the shaft 10 moves along the movement locus on the rear end portion side of the loading platform 9. The hole 16 is moved up and down. When the shaft 10 moves up and down, the plurality of balls 17 rotate in the vertical direction, so that the vertical movement of the loading platform 9 relative to the chassis frame 2 is not hindered. Therefore, the vertical vibration generated on the rear end side of the loading platform 9 during traveling of the vehicle can be suppressed by the air spring 11 and the shock absorber 12.

  Further, since the movement of the loading platform 9 in the front-rear and left-right directions is regulated by the contact between the outer peripheral surface of the shaft 10 and the plurality of balls 17 of the loading platform movement regulating member 8, for example, a load in the front of the vehicle is applied to the loading platform 9 at the time of a vehicle collision When input, the forward movement of the loading platform 9 with respect to the chassis frame 2 can be restricted, and the living space of the cab 3 can be secured. Further, even when inertial force during turning of the vehicle is generated in the loading platform 9, the movement of the loading platform 9 in the front-rear and left-right directions with respect to the chassis frame 2 can be regulated by the shaft 10 and the loading platform movement restricting member 8. The handling stability at the time can be improved.

  In addition, since the loading platform movement restricting member 8 is disposed on each of the left and right chassis frames 2, the rotational movement of the loading platform 9 with respect to the chassis frame 2 in the horizontal plane can be regulated.

  Moreover, since the loading platform movement restricting member 8 is arranged on the rear end side of the chassis frame 2 where the air spring 11 is arranged, the rear end side of the loading platform 9 can be mechanically restrained when the vehicle turns. The movement of the rear end side of the loading platform 9 when the vehicle turns can be reliably regulated.

  Further, since the air spring 11 and the shock absorber 12 are arranged on the rear end side of the chassis frame 2 and support the rear end side of the loading platform 9, the vibration is larger than that on the front end side of the loading platform 9. The vibration on the rear end side of the loading platform 9 can be effectively suppressed.

  In addition, although the case where the front end part side of the loading platform 9 was supported by the hinge 24 was demonstrated in this embodiment, you may support the front end part side of the loading platform 9 with the air spring 11, for example. That is, the entire cargo bed 9 may be supported by the air spring 11. In such a case, since the movement of the loading platform 9 with respect to the chassis frame 2 is not limited to the movement having a rotation component, the shaft 10 does not need to have a curvature.

  Further, the rear end portion side of the loading platform 9 may be supported by the hinge 24 and the front end portion side of the loading platform 9 may be supported by the air spring 11 and the shock absorber 12.

  Moreover, although the case where the loading platform movement restricting member 8 is arranged on each of the left and right chassis frames 2 has been described, only one loading platform movement regulating member 8 may be arranged on the chassis frame 2.

  Furthermore, although the case where the loading platform movement restricting member 8 and the shaft 10 are disposed in the vicinity of the air spring 11 has been described, the loading platform movement regulating member 8 and the shaft 10 may be separated from the air spring 11 in the front-rear and left-right directions. .

  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 a loading platform that is movably supported with respect to a chassis frame.

DESCRIPTION OF SYMBOLS 1 Vehicle 2 Chassis frame 8 Loading platform movement restricting member 9 Loading platform 10 Shaft (sliding member)
11 Air spring (load carrier vibration suppression means)
12 Shock absorber (loading platform vibration suppression means)
16 hole (through hole)
17 balls (rolling members)
24 Hinge (support member)

Claims (2)

A pair of left and right chassis frames extending along the longitudinal direction of the vehicle;
A loading platform disposed above the left and right chassis frames;
A carrier vibration suppression means that is interposed between the left and right chassis frames and the cargo bed, movably supports the cargo bed relative to the chassis frame, and suppresses vertical vibrations of the cargo bed;
A sliding member supported on the cargo bed side and extending vertically below the cargo bed;
A through-hole that is supported on the chassis frame and passes through the sliding member, and contacts with the outer peripheral surface of the sliding member that is inserted through the through-hole at a plurality of locations in the circumferential direction. A load carrier movement restriction member having a plurality of rolling members that restrict movement in the direction and allow movement in the vertical direction,
The loading platform structure for a vehicle, wherein the sliding member moves up and down the through hole while maintaining a state in contact with the plurality of rolling members. The vehicle bed structure according to claim 1,
A support member that rotatably supports one end side of the front end or the rear end of the cargo bed on the left and right chassis frames;
The loading platform vibration suppressing means is disposed on the other end side of the front end or the rear end of the left and right chassis frames, respectively, and a pair of left and right air springs that support the left and right corners of the loading platform from below, A pair of left and right shock absorbers disposed in the vicinity of the air spring to damp vibrations of the cargo bed,
The cargo bed movement restricting members are respectively disposed on the other end side of the left and right chassis frames,
The loading platform is capable of rotating in the vertical direction on the other end side around the support member,
The vehicle loading platform structure, wherein the sliding member has a curved shaft shape that extends along an arc passing through a through hole of the loading platform movement restricting member with the support member as a center.

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