JP2015147448A - Truck - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a truck in which operation efficiency of a hydraulic fluid changeover part can be prevented from degrading even when the hydraulic fluid changeover part is unexpectedly fastened to a vehicle body frame with large torque.SOLUTION: The truck includes a cargo box mounted on a vehicle body frame and a cargo box tilting device capable of tilting the cargo box to the side between the cargo box and the vehicle body frame, the cargo box tilting device includes a tilting regulation device for regulating a tilting angle of the cargo box, the tilting regulation device includes a hydraulic fluid changeover part for controlling supply-discharge of a hydraulic fluid with respect to the cargo box tilting device. The hydraulic fluid changeover part is a block body within which a housing part for housing a rod part slidable in a uniaxial direction and a hydraulic fluid flow passage for changing over the communication or cutoff performed by the rod part are formed, and the hydraulic fluid changeover part is fixed to the vehicle body frame by a threadedly engaging member threadedly advancing-retreating in a direction crossing with the uniaxial direction. At least a part of the housing part projects more than a threadedly engaging seat part threadedly engaging with the threadedly engaging member in the threadedly advancing-retreating direction of the hydraulic fluid changeover part.

Description

  The present invention relates to a lorry that tilts a cargo box, and more particularly, to a hydraulic oil switching unit that switches between communicating and shutting off hydraulic oil supplied to and discharged from a cargo box tilting device.

  In a lorry equipped with a cargo box that can be tilted and mounted on the body frame, for example, a lorry that can tilt the cargo box to the side of the vehicle, the fall of the lorry is prevented by regulating the tilt angle of the cargo box. The As such a tilt angle regulating means, there is a hydraulic oil switching section that is provided in a tilting device including a hydraulic cylinder and switches hydraulic oil supply / discharge to the hydraulic cylinder by tilting the cargo box to the left and right.

  Specifically, when the tilt angle of the packing box reaches a predetermined angle, a flow path for returning the hydraulic oil supplied to the hydraulic cylinder to the oil tank by the switching valve is communicated to restrict extension of the hydraulic cylinder (Patent Document) 1). A check valve or the like is used as the switching valve, and the switching valve is switched when the rod part protruding as the packing box tilts is pressed, so that simple and stable tilting regulation of the packing box is taken. ing.

Japanese Patent Laid-Open No. 2003-159997

  With regard to the regulation of the tilting of the packing box, as a further development, switching control of highly efficient hydraulic oil and detection of the highly accurate packing box tilting angle have been advanced. Based on the difference in accuracy, attention was paid to the difference in the performance of the hydraulic oil switching section.

  The hydraulic oil switching section is a molded body in which a hydraulic oil flow path and the like are molded, and is fastened to the vehicle body frame via bolts. When the rod portion is pressed along with the tilting operation of the cargo box, the switching valve is switched using the pressing as a trigger. However, depending on the fastening of the hydraulic oil switching portion, the rod portion may not function well.

  In many cases, a desired torque is set for fastening the hydraulic oil switching unit. However, if the bolt is tightened with a torque of a certain level or more, the tightening force may cause distortion in the rod portion accommodating portion in the vicinity of the bolt fastening portion. Although the rod portion is configured to slide on the housing portion, the rod portion is difficult to slide only by slight distortion. In particular, the hydraulic oil switching unit is provided with many members such as a cargo box tilting device including a hydraulic cylinder in the vicinity thereof, and the size thereof is regulated. Therefore, the bolt fastening portion is provided in a state adjacent to the rod portion and the hydraulic oil flow path, and is easily affected by torque exceeding a desired value. On the other hand, since the rod portion is configured to be pressed by the tilting operation of the cargo box, that is, the configuration in which the tilting motion of the cargo box is transmitted, the bolt fastening cannot be loosened.

  Moreover, even if it is a case where it fastens with the torque more than setting, it is difficult to visually recognize whether the magnitude | size of the torque is more than a setting value. Therefore, unless the cargo box tilting device is actually operated, it cannot be confirmed whether the rod portion functions well. If the rod portion does not function well, replacement work is necessary at that point, which is not preferable in terms of work efficiency.

  The present invention has been made in view of these points, and an object of the present invention is to provide a lorry equipped with a hydraulic oil switching unit that can prevent a reduction in operating efficiency even when the clutch is unexpectedly fastened with a large torque.

  In the present invention, the following means are used to solve the above problems.

The present invention is intended for a lorry equipped with a cargo box mounted on a vehicle body frame and a cargo box tilting device capable of tilting the cargo box between the vehicle body frame. The cargo box tilting device is provided with a tilt regulating device that regulates the tilt angle of the cargo box, and the tilt regulating device has a hydraulic oil switching unit that controls hydraulic oil to the cargo box tilting device. The hydraulic oil switching unit is a block body in which a housing unit that accommodates a rod portion that is slidable in a uniaxial direction and a hydraulic oil flow path that is switched between communication and blocking by the rod portion are molded inside. And at least a part of the housing portion in the screwing / retracting direction of the hydraulic oil switching portion in the screwing / retracting direction of the hydraulic oil switching portion. It is set as the structure protruded rather than the screwing seat part to which is attached.
By setting it as this structure, it will be in the state which at least one part of an accommodating part formation area does not overlap with a screwing seat part in the thickness direction of a hydraulic-oil switching part.
The screw seat portion may be provided adjacent to the rod portion.
Moreover, the screwing seat portion may be adjacent to the forming portion of the housing portion in the screwing and retreating direction of the screwing member.
Furthermore, it is preferable that the screwing seat part has a thinner shape than the surrounding part of the rod part in the screwing-back direction of the screwing member.

  The lorry of the present invention is characterized by the hydraulic oil switching portion fixed to the vehicle body frame, and the housing portion of the rod portion is a screwing seat to which a screwing member such as a bolt is attached in the screwing and retreating direction of the screwing member. By projecting from the part, the hydraulic oil switching part of the block body is configured to avoid the screwing stress of the screwing member at least in a part of the housing part of the rod part. That is, even when a large torque is applied to the screwing member, distortion of the housing portion can be suppressed, and the sliding operation of the rod portion is not hindered.

It is the side view and rear view of a truck according to an embodiment of the present invention. (A) is a perspective view which shows the state which the cargo truck based on embodiment of this invention dumped the packing box sideways, (b) is a perspective view which shows the vehicle body frame of the same truck. 1 is a hydraulic circuit diagram of a cargo box tilting device for a truck according to an embodiment of the present invention. It is the side view and rear view which show the attachment state of the tilt control apparatus which concerns on embodiment of this invention. It is a perspective view of the hydraulic oil switch part concerning the embodiment of the present invention.

  An example of an embodiment according to the present invention will be described with reference to the drawings.

  FIG. 1 shows a truck 100 according to the present embodiment. The cargo vehicle 100 has a configuration in which the cargo box 2 mounted on the vehicle body frame 1 can be tilted (dumped) not only to the rear of the vehicle but also to both sides of the vehicle by the cargo box tilting device 3. FIG. 1A shows a state in which the packing box 2 is tilted backward, and FIG. 1B shows a state in which the packing box 2 is tilted left and right.

  The cargo box tilting device 3 includes a lift arm 31, a tension arm 32, and a hydraulic cylinder 33. One ends of the lift arm 31 and the tension arm 32 are pivotally supported by pivot pins 34. The other end portion of the lift arm 31 is provided at the bottom portion of the cargo box 2 via the cargo box side bracket 35 so as to be rotatable in the vertical direction and the left and right direction. The vehicle body 1 is provided so as to be rotatable in the vertical direction and the horizontal direction.

  The hydraulic cylinder 33 has a distal end on the telescopic side pivoted on the middle of the lift arm 31 by a pivot pin 37, and a base end pivoted on the pivot arm 38 near the other end of the tension arm 32. Yes. The cargo box 2 is tilted via the lift arm 31 and the tension arm 32 by the expansion and contraction operation of the hydraulic cylinder 33.

  In addition, hinge portions 21 serving as the tilt centers of the cargo box 2 are provided at the four corners of the vehicle body 1 and the cargo box 2, respectively. These hinge portions 21 are configured to be freely disengageable by appropriate engagement / disengagement means. For example, the left and right front hinge portions 21 are detached, and only the left and right rear hinge portions 21 are engaged, and the cargo box tilting device is engaged. If the hydraulic cylinder 33 of No. 3 is extended, the cargo box 2 tilts backward about the hinge part 21 on the left and right rear.

  Further, if the left and right hinge portions 21 are detached and the hydraulic cylinder 33 is extended with only the right and left hinge portions 21 engaged, the cargo box 2 is moved rightward with the right and left hinge portions 21 as the center. Tilt. On the other hand, if the right and left hinge parts 21 are detached and only the left and right hinge parts 21 are engaged and the hydraulic cylinder 3 is extended, the left and right hinge parts 21 are tilted to the left.

  FIG. 2A shows the lorry 100 with the cargo box 2 tilted to the right. The packing box tilting device 3 is attached to the vehicle body frame 1, and in the vicinity thereof, a tilting control device 4 that controls the tilting angle of the packing box 2 and a tank T of hydraulic oil supplied to and discharged from the hydraulic cylinder 33. Etc. are provided. The tilt regulating device 4 is provided with a valve bracket VB that functions to regulate the tilt of the cargo box 2 and a check valve that will be described later.

  The vehicle body frame 1 includes a pair of left and right chassis frames 11 with the longitudinal direction of the vehicle (X direction) as a longitudinal direction, and a subframe 12 welded in a loaded state thereon.

  As shown in FIG. 2B, the sub-frame 12 includes a pair of left and right vertical frames 12a whose longitudinal direction is the vehicle longitudinal direction (X direction) and a pair of front and rear horizontal frames whose longitudinal direction is the vehicle width direction (Y direction). 12b and a cross frame 12c installed on the vertical frame 12a at a position between the horizontal frames 12b. The valve bracket VB is provided on the cross frame 12c.

  A hydraulic circuit shown in the hydraulic circuit diagram of FIG. 3 is connected to the hydraulic cylinder 33 of the cargo box tilting device 3. Between the hydraulic cylinder 33 and the tank T, a return flow path R1 for returning the hydraulic oil in the hydraulic cylinder 33 to the tank T is connected via a check valve V. The check valve V is provided in the tilt regulating device 4 and functions as a hydraulic oil switching unit that performs hydraulic oil supply / discharge control with respect to the hydraulic cylinder 33. When the return flow path R1 is switched from the shut-off state to the communication state by the check valve V, the hydraulic oil supplied from the hydraulic pump P to the piston chamber of the hydraulic cylinder 33 returns to the tank T, and the hydraulic cylinder 33 is extended. Be regulated. As a result, the tilting operation of the packing box 2 is restricted.

  Switching control of the return flow path R1 by the check valve V will be described with reference to FIG. 4 showing the tilt regulating device 4 to which the check valve V is attached. 4A is a side view showing the state of the tilt regulating device 4 viewed from the left side of the freight car 100, and FIG. 4B is a rear view showing the state viewed from the rear side.

  The tilt regulating device 4 includes a valve bracket VB provided on the cross frame 12c, a pivot arm 4A pivotally supported by the valve bracket VB via a shaft S so as to pivot in the vehicle front-rear direction, and a valve bracket VB. And a check valve V attached to the cross frame 12c. The valve bracket VB is a unit body of a cover bracket VB1 that covers the upper part of the rotating arm 4A and a mounting bracket VB2 to which the cover bracket VB1, the rotating arm 4A, and the check valve V are attached.

  The cover bracket VB1 has a substantially T-shaped flat surface portion (see FIG. 2B) composed of a wide width portion VB11 and a narrow width portion VB12, and is welded to the upper surface of the cross frame 12c. The rear end portion of the wide width portion VB11 and the left and right end portions of the narrow width portion VB12 are bent downward and are fastened to the mounting bracket VB2 at the left and right end portions of the narrow width portion VB12.

  The mounting bracket VB2 is sandwiched between two first mounting brackets VB21 fastened in a state sandwiched between the narrow width portions VB12 with the longitudinal direction of the vehicle as a longitudinal direction, and the two first mounting brackets VB21. And the second mounting bracket VB22 welded in.

  The rotating arm 4A is a substantially T-shaped member composed of a wide width portion 4A1 and a narrow width portion 4A2. The wide width portion 4A1 has a vehicle width direction as a longitudinal direction, and the narrow width portion 4A2 has a vehicle longitudinal direction as a longitudinal direction. It is said. Bolts are attached to the wide width portion 4A1 so as to protrude downward at both ends thereof. The narrow width portion 4A2 is pivotally supported by the shaft S inserted through the two first mounting brackets VB21 at the intermediate portion thereof. The front end 41A2 on the vehicle front side of the narrow portion 4A2 extends to the lower side of the end of the narrow portion VB12 of the cover bracket VB1.

The check valve V is fixed in a state of being fastened to the second mounting bracket VB22. The second mounting bracket VB22 has a horizontal portion welded to the first mounting bracket VB21, and a vertical portion that is bent with respect to the horizontal portion and positioned slightly away from the front surface of the cross frame 12c. The valve V is fastened to the vertical portion.
The check valve V has a rod portion Vr protruding from the upper surface, and the top portion of the rod portion Vr faces the front end portion 41A2 of the rotating arm 4A in a proximity state.

As shown in FIG. 4B, a left and right tilting member 3R that can tilt to the left and right with respect to the cross frame 12c about the vehicle front-rear direction is provided below the wide portion 4A1 of the rotating arm 4A. Yes. The left / right tilting member 3R has a substantially hexagonal cross section and is connected to the vehicle body side bracket 36 provided with the tension arm 32 described above. When the packing box 2 tilts to the right, the left end 3R1 of the left / right tilting member 3R rotates upward and contacts the bolt 41A1 on the left in the figure among the bolts attached to both ends of the wide width portion 4A1. Touch. On the other hand, when the cargo box 2 tilts to the left, the right end 3R2 of the left / right tilting member 3R contacts the right bolt 42A1 in the drawing. When the left and right tilting member 3R comes into contact with any of the bolts 41A1 and 42A1 of the wide width portion 4A1, the rotating arm 4A rotates counterclockwise in FIG. 4A, and the front end portion 41A2 of the narrow width portion 4A2 The rod portion Vr is pressed downward. That is, the rod portion Vr is provided so as to be slidable along the vertical direction, and switching control of communication or blocking of the return flow path in the hydraulic circuit diagram described above is performed by the sliding operation.
The check valve V having such a function has an external shape shown in FIG. 5A and an internal structure shown in the schematic plan view of FIG.

  As shown in FIG. 5 (a), the check valve V includes a rear surface V1 in which a vehicle rear side surface (hereinafter simply referred to as “rear surface”) V1 abuts on a second mounting bracket VB22 of the mounting bracket VB2, and the opposite surface. The vehicle front side surface (hereinafter simply referred to as “front surface”) V2, the left side surface V3 and the right side surface V4 in which the flow path hole Rh to which the return flow path R1 is connected, and the rod portion Vr protrude. It has an upper surface and a lower surface V6 which is the opposite surface, and is composed of a block body made of a metal material. The “block body” according to the present embodiment refers to a lump state in which the rod portion Vr, the hydraulic oil flow path, and the like are molded inside and the other portions are filled with a metal material.

  As shown in the figure, the check valve V is provided with four curved surfaces Vc whose longitudinal direction is the X direction on the outer surface. Although the curved surface is provided from the front surface toward the rear surface (X-axis negative direction side), the extending length in the longitudinal direction is shorter than the thickness of the check valve V. For this reason, the rear surface V1 side has a shape in which four corners protrude from the vertical plane (YZ plane). The projecting portion Vd is provided with an insertion hole Vh, and the bolt 5 is screwed back and forth in the X-axis direction through the insertion hole Vh. The protruding portion Vd serves as a screw seat portion (hereinafter simply referred to as “seat portion Vd”) for fastening the check valve V to the cross frame 12c. Therefore, the seat portion Vd has a size that allows a screwed member such as the bolt 5 and the nut 6 to be sufficiently fastened. In the present embodiment, the bolt 5 is configured to be screwed to the nut 6. However, the insertion hole Vh may be a screw hole, and the bolt 5 may be directly screwed to the seat portion Vd.

  As shown in the figure, the seat portion Vd has a thin shape whose thickness (length in the X direction) W1 is about 1/4 of the thickness W2 of the check valve V, and the rod portion Vr is inserted therethrough. The hole, specifically, the rod portion Vr has a thickness substantially the same as the thickness of the surrounding portion Ve surrounding the rod portion accommodating portion (hereinafter simply referred to as “accommodating portion”) Vs in the block body of the check valve V. doing. Further, on the rear surface V1 of the check valve V, the seat portion Vd and the surrounding portion Ve are provided in a substantially flush state. Therefore, in the thickness direction (X direction) of the check valve V, the seat portion Vd and the surrounding portion Ve on the rear surface V1 side are portions provided within substantially the same range. The portion Vd is a portion adjacent to the housing portion Vr, specifically, a portion that does not overlap the housing portion Vr. By providing the curved surface Vc and making the thickness of the seat portion Vd thinner than that of the other check valves V, the length of the bolt 5 can be shortened (the enlargement of the bolt 5 can be prevented). Further, as compared with a box-shaped rectangular parallelepiped shape having no curved surface Vc, the weight is reduced because the four corners are cut out by the region of the curved surface Vc.

  As shown in FIG. 5B, the check valve V includes a housing portion Vs for the rod portion Vr that extends substantially in the center of the block body (extends in the left-right direction in the drawing), and a flow that forms part of the return flow path R1. Paths R11 and R12 are molded inside. A plunger Vp that closes between the flow paths R11 and R12 is provided at the tip of the rod portion Vr, and a spring member S1 that biases the rod portion Vr in the protruding direction (Z-axis positive direction side) is provided on the plunger Vp. It has been. Therefore, when the right and left tilting member 3R tilts with the extension of the hydraulic cylinder 33 when tilting the cargo box 2, and the rod portion Vr is pressed against the front end portion 41A2 of the rotating arm 4A, the rod portion Vr is shown in the figure. Slide to the left (Z-axis negative direction side). By this slide, the flow paths R11 and R12 communicate with each other, the return flow dew R1 is switched to the communication state, and the tilting operation of the cargo box 2 is restricted. When the tilting angle of the packing box 2 becomes equal to or less than a predetermined value, the pressing of the rod part Vr is released, and the rod part Vr is urged in the protruding direction (Z-axis positive direction side) by the spring member S1, so Regulations are lifted.

  In the check valve V according to the present embodiment, a curved surface Vc is formed between the rod portion Vr and an insertion hole Vh provided in the vicinity thereof, and a seat portion Vd in the thickness direction (X direction) of the check valve V. Is more concave than the front surface V2 (the front surface V2 is protruding from the seat). Therefore, when the bolt 5 is screwed back and forth in the insertion hole Vh, the stress (tightening stress by the bolt 5) generated mainly by spreading in the width direction (Y direction) of the check valve V due to the screw back and forth of the bolt 5 is mainly It is limited to the thickness region of the seat portion Vd. Therefore, since the accommodating part Vs is provided in the state which protruded in the thickness direction rather than the seat part Vd, it can prevent that the stress generated by the screwing body of the bolt 5 reaches the accommodating part Vs. For this reason, even if the torque larger than the desired torque is applied to the bolt 5 and the check valve V is screwed into the vehicle body frame 1, the influence on the storage portion Vs can be suppressed, and the storage portion Vs is not distorted. Can be. That is, even if the bolt is fastened with a large torque that cannot be visually recognized, the occurrence of distortion or the like in the rod portion Vr is suppressed, and the sliding operation of the rod portion Vr is not hindered. In particular, since the screwing through the bolt 5 is performed at the left and right ends of the rod portion Vr, the effect is great.

Similarly, since the seat portion Vd is also provided in the vicinity of the portion where the spring member S1 is provided, the function of the spring member S1 can be achieved even if the bolt is screwed and attached to the seat portion Vd with a large torque. There is no inhibition.
Therefore, the check valve V can be operated satisfactorily even if a large torque is unexpectedly applied in the check valve V mounting process.

  The thickness W1 of the seat portion Vd described above is substantially the same as the thickness (thickness) W3 of the portion Ve that covers the rod portion Vr (its storage portion Vs), but has a predetermined screwing strength with respect to the screwing member. However, it may be smaller than the thickness (thickness) W3. Further, as shown in FIG. 5A, in the thickness direction of the check valve V, the accommodating portion Vs and the seat portion Vd are provided so that their forming regions do not overlap with each other. Even if it protrudes more than the seat part Vd (protrusively toward the X-axis positive direction side), the effect of screwing via the bolt 5 can be suppressed. In this case, the seat portion Vd has a shape that is thinner than the thickness (for example, W2) of the entire surrounding portion that surrounds the accommodating portion Vs. In such a case, for example, if the accommodating portion Vs has a cylindrical shape, the edge of the accommodating portion Vs that is closest to the seat portion Vd when the thickness W1 of the seat portion Vd is made smaller than about half of the thickness W2 of the check valve V. This is preferable because it is possible to avoid the influence of screwing on the portion. The protruding length of the housing portion Vs can be appropriately changed depending on the positions of the housing portion Vs and the seat portion Vd, the material and size of the check valve V, and the like. Further, in terms of suppressing the occurrence of distortion in the storage portion Vs, the rear surface V1 of the check valve V is not a substantially flat surface, but a leg portion that protrudes from the rear surface V1 (projects toward the negative X-axis direction). It is good also as a structure which provided the seat in the leg part.

  The check valve V has a posture in which the rod portion Vr is screwed into the cross frame 12c in a direction in which the rod portion Vr projects vertically upward, but the posture can be changed as appropriate. In addition, the check valve V is a block body made of a metal material. However, regarding the material of the check valve V, when the stress generated by the screwing affects the function of the neighboring member such as the rod portion Vr, other materials are used. Even if it is used, the same effect can be obtained. Further, the fixed position is not limited to the cross frame 12c, but may be another body frame member or other than the body frame. In addition, the check valve V has been described as a configuration that functions when the cargo box 2 is tilted sideways. However, when the check valve V functions in the same manner when tilting backward, the same effect can be obtained, so that the check valve V can be applied. is there.

DESCRIPTION OF SYMBOLS 1 Body frame 2 Packing box 3 Packing box tilting device 4 Tilt control device 5 Bolt (screwing member)
6 Nut (screwing member)
11 Chassis frame (body frame)
12 Subframe (body frame)
12a Vertical frame (body frame)
12b Horizontal frame (body frame)
12c Cross frame (body frame)
33 Hydraulic cylinder VB Valve bracket V Check valve (hydraulic oil switching part)
Vc curved surface Vd screw seat part Ve go part 100 lorry

Claims (4)

A cargo box tilting device capable of tilting the cargo box between the cargo box mounted on the car frame and the car frame,
The packing box tilting device is provided with a tilting control device that controls the tilting angle of the packing box,
The tilt regulating device has a hydraulic oil switching unit that controls hydraulic oil to the cargo box tilting device,
The hydraulic oil switching unit is a block body in which a housing unit that accommodates a rod portion that is slidable in a uniaxial direction and a hydraulic oil flow path that is switched between communication and blocking by the rod portion are molded inside. And fixed to the vehicle body frame by a screwing member that is screwed back and forth in a direction crossing the uniaxial direction,
In the screw advance / retreat direction of the hydraulic oil switching portion, at least a part of the housing portion protrudes from a screw seat portion to which the screw member is attached. The lorry according to claim 1, wherein the screw seat portion is provided adjacent to the rod portion. 3. The lorry according to claim 1, wherein the screwing seat portion is adjacent to a forming portion of the housing portion in a screwing-back direction of the screwing member. The lorry according to claim 1 or 2, wherein the screw seat portion has a thinner shape than the surrounding portion of the rod portion in the screwing and retracting direction of the screw member.

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