JPH0529850U - Packing box tilting device for the three-wheel dump truck - Google Patents

Abstract

(57) [Abstract] [Purpose] Quickly and efficiently perform the assembly work by simply assembling the device for tilting the packing box. A packing box tilting device (3) comprises a lift arm (4) having one end pivotally supported by a packing box side bracket (7) rotatably attached to the bottom of the packing box (2) and the other end of the lift arm (4). And a lift arm 4 and a tension arm, one end of which is pivotally supported, and the other end of which is pivotally supported by a vehicle body side bracket 8 which is attached to the bottom of the vehicle body frame 1 so as to be rotatable left and right. 5, a lift cylinder 4, a tension arm 5, a telescopic cylinder 6, a vehicle body side bracket 7, and a luggage box side bracket 8 are unitized.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a load box tilting device for tilting a load box in a triple transfer dump truck.

[0002]

[Prior Art]

 Conventionally, there has been provided a three-wheel dump truck in which a luggage box mounted on a vehicle body frame is tiltably mounted rearward and left and right sides by a luggage box tilting device provided between the luggage box and the vehicle body frame. .

[0003]

[Problems to be solved by the device]

 However, in the above-mentioned conventional one, there is a problem in that the work of assembling each member constituting the load box tilting device to the load box and the vehicle body frame is troublesome and the workability is poor.

[0004]

[Means for Solving the Problems]

 The load box tilting device in the three-wheel dump truck of the present invention is mounted so that the load box mounted on the vehicle body frame can be tilted rearward and left and right by the load box tilting device provided between the load box and the vehicle body frame. In the three-fold dump truck described above, the load box tilting device includes a lift arm whose one end is pivotally supported by a load box side bracket rotatably attached to the bottom of the load box to the left and right, and the lift arm. One end is pivotally supported on the other end of the vehicle body, and the other end is pivotally supported on the vehicle body side bracket that is rotatably attached to the bottom of the vehicle body frame. The lift arm, the tension arm, the expansion cylinder, the vehicle body side bracket, and the luggage box side bracket are unitized.

[0005]

[Operation] By assembling the lift arm, the tension arm, the telescopic cylinder, the vehicle body side bracket, and the luggage box side bracket which compose the luggage box tilting device as a unit, the assembly of the luggage box tilting device is performed by mounting the luggage box side bracket on the cargo box side bracket. It is only necessary to fix the bracket to the bottom of the vehicle and the bracket on the vehicle body side to the vehicle body frame, which simplifies this assembling work.

[0006]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a schematic overall configuration of a triple transfer dump truck according to the present invention.

In FIG. 1, reference numeral 2 denotes a packing box mounted on a vehicle body frame 1. The packing box 2 is rearwardly and laterally left and right by a packing box tilting device 3 provided between the packing box 2 and the vehicle body frame 1. It is designed to be freely tilted.

As shown in FIGS. 2 and 3, the load box tilting device 3 includes a lift arm 4, a tension arm 5, and a telescopic cylinder 6.

One end of the lift arm 4 is connected to the bottom of the cargo box 2 via a bracket 7 on the cargo box side. The luggage box side bracket 7 is a pivotal support member 71 which pivotally supports one end of the lift arm 4 by a pivotal support pin 41 in a vertically rotatable manner, and a bottom portion of the luggage box 2 is pivotable in left and right directions. And a pivot shaft 72 fixed to the pivot member 71 at one end. That is, one end of the lift arm 4 is connected to the bottom of the luggage box 2 so as to be rotatable in the left-right direction about the rotation shaft 72 and in the up-down direction about the pivot pin 41. The rotating shaft 72 is detachably fixed to the bottom of the luggage box 2 by a bolt 73 screwed to the other end.

One end of the tension arm 5 is pivotally supported on the other end of the lift arm 4 by a pivot pin 51, and the other end is connected to the vehicle body 1 via a vehicle body side bracket 8. ing.

The vehicle body side bracket 8 has a pivotal support member 81 that pivotally supports the other end of the tension arm 5 by a pivotal support pin 52 in a vertically rotatable manner, and one end fixed to the pivotal support member 81. It is composed of a rotating shaft 82 provided and a mounting member 83 which supports the rotating shaft 82 so as to be rotatable in the left-right direction and is fixed to the vehicle body frame 1. The other end is connected to the body frame 1 so as to be rotatable in the left-right direction about the rotation shaft 82 and in the up-down direction about the pivot pin 52. The mounting member 83 is detachably fixed to the body frame 1 by a fixing means such as a bolt.

In the telescopic cylinder 6, the telescopic end 61 is pivotally supported in the middle of the lift arm 4 by a pivot pin 62, and the base 63 is pivotally supported near the other end of the tension arm 5. It is pivotally supported by a pin 64, and the expansion / contraction operation of the expansion / contraction cylinder 6 tilts the load box 2 via the lift arm 4 and the tension arm 5.

Here, the lift arm 4, the tension arm 5, the telescopic cylinder 6, the luggage box side bracket 7, and the vehicle body side bracket 8 described above are unitized with these as one unit.

As a result, when assembling the luggage box tilting device 3 between the bottom of the luggage box 2 and the vehicle body frame 1, the luggage box side bracket 7 is fixed to the bottom of the luggage box 2 by the bolts 73, and the vehicle body side bracket 8 is attached. The mounting member 83 can be easily mounted by simply fixing it to the vehicle body frame 1 by the fixing means.

In addition, hinge portions 21 serving as tilting centers of the luggage box 2 are provided at four corners of the body frame 1 and the luggage box 2, respectively. The hinge portions 21 are configured to be disengageable by an appropriate engaging / disengaging means. For example, the left and right front hinge portions 21 are disengaged and only the left and right rear hinge portions 21 are engaged, and the luggage box is tilted. When the telescopic cylinder 6 of the device 3 is extended, the luggage box 2 is tilted rearward about the left and right rear hinge parts 21, and the left and right front and rear hinge parts 21 are detached so that only the right and left front and rear hinge parts 21 are removed. When the telescopic cylinder 6 of the load box tilting device 3 is extended in the engaged state, the load box 2 is tilted rightward about the right and front hinge portions 21 and further separated from the right and front hinge portions 21. By extending the telescopic cylinder 6 of the load box tilting device 3 with only the front left and right hinge portions 21 engaged, the load box 2 tilts leftward about the left and right front and rear hinge portions 21. It will be.

Further, in the vicinity of the rotation shaft 82 of the vehicle body side bracket 8, as shown in FIG. 4, a tilt angle regulating device 9 for regulating the tilt angle of the luggage box 2 to the left and right is provided.

The tilt angle restricting device 9 is composed of an operating member 91 integrally provided on the rotating shaft 82, and a restricting arm 92 rotatably supported by a pivot pin 93 on the body frame 1 side. Is made.

The regulating arm 92 has a contact bolt that contacts the upper surface of the operating member 91 when the operating member 91 rotates left and right as the rotating shaft 82 rotates to the left and right and reaches a predetermined rotating position. 95 is provided. Further, an abutting portion 96 that abuts a switching rod 101 that switches a check valve 100 provided near the regulating arm 92 is formed on the upper portion of the regulating arm 92.

FIG. 5 shows a hydraulic circuit of the tilt angle regulation device 9.

In FIG. 5, 110 is a hydraulic pump, 111 is a switching valve for switching the expansion / contraction of the expansion / contraction cylinder 6, that is, the tilting operation of the cargo box 2, and 112 is an oil reservoir. A bypass circuit 113 communicating with an oil reservoir 112 is provided in an oil passage on the piston chamber 66 side of the expansion / contraction cylinder 6, and the bypass valve 113 is provided with the check valve 100.

Further, the piston portion 65 of the telescopic cylinder 6 is provided with a switching valve 68 that connects the piston chamber 66 and the rod chamber 67 to each other when the telescopic cylinder 6 is maximally extended.

Next, the operation of the tilt angle regulating device 9 configured as described above will be described.

When the load box 2 is tilted to the left and right, when the load box 2 tilts to the left and right due to the extension operation of the telescopic cylinder 6 and reaches a predetermined tilt angle, the upper surface of the operating member 91 contacts the contact bolt 95. To rotate the regulating arm 92 upward. As a result, the contact portion 96 of the regulation arm 92 pushes the switching rod 101 of the check valve 100, and the check valve 100 is switched. As a result, the pressure oil supplied from the hydraulic pump 110 to the piston chamber 66 of the telescopic cylinder 6 returns to the oil reservoir 112 via the bypass circuit 113, which restricts the extension of the telescopic cylinder 6. That is, the tilting movement of the packing box 2 is restricted.

The tilting regulation angle of the luggage box 2 can be appropriately adjusted by the contact bolt 95.

6 and 7 show another embodiment of the tilt angle regulating device.

The tilt angle restricting device 200 is composed of an operating member 210 integrally provided on the rotating shaft 82 and a link mechanism 220 provided on the body frame 1 side.

The link mechanism 220 comes into contact with the upper part of the operating member 210 when the operating member 210 rotates left and right as the rotating shaft 82 rotates left and right and reaches a predetermined left and right rotating position. A pair of link arms 225 and 226, which are equipped with bolts 221 and 222 and are integrally provided on the rotating shafts 223 and 224, a connecting arm 227 that connects the pair of link arms 225 and 226, and one rotating shaft 224. And a contact member 228 which is provided at one end of the check valve 100 and contacts the switching rod 101 of the check valve 100.

The rest of the configuration is the same as that of the above-described embodiment, the same members are given the same reference numerals, and description thereof is omitted.

In the tilt angle control device 200 configured as described above, when the load box 2 is tilted to the left and right, the load box 2 tilts left and right by the extension operation of the telescopic cylinder 6 and reaches a predetermined tilt angle. Then, the upper part of the actuating member 210 comes into contact with one of the left and right contact bolts 221 and 2222 to rotate the link arms 225 and 226 upward. With the upward rotation of the link arms 225 and 226, the contact member 228 presses the switching rod 101 of the check valve 100 to switch the check valve 100. As a result, similarly to the above-described embodiment, the pressure oil supplied from the hydraulic pump 110 to the piston chamber 66 of the telescopic cylinder 6 returns to the oil reservoir 112 via the bypass circuit 113, whereby the extension of the telescopic cylinder 6 is restricted. It That is, the tilting operation of the packing box 2 is restricted.

[0031]

[Effect of the device]

 As described above, according to the present invention, by assembling the lift box, the tension arm, the telescopic cylinder, the vehicle body side bracket, and the load box side bracket, which constitute the load box tilting apparatus, into a unit for mounting the load box tilting apparatus. In addition to fixing the bracket on the bottom of the luggage box to the bottom of the luggage box, the bracket on the vehicle body side need only be fixed to the vehicle body frame, which allows the loading box tilting device to be easily assembled and facilitates the assembly work quickly. You can do it efficiently.

[Brief description of drawings]

FIG. 1 is a side view showing a schematic overall configuration of a triple transfer dump truck.

FIG. 2 is an enlarged side view showing the configuration of the luggage box tilting device.

FIG. 3 is an enlarged bottom view showing a vehicle body side mounting portion of the load box tilting device.

FIG. 4 is a front view showing a tilt angle regulating device.

FIG. 5 is a hydraulic circuit diagram of the tilt angle regulating device.

FIG. 6 is a front view showing another embodiment of the tilt angle regulating device.

FIG. 7 is a plan view showing another embodiment of the tilt angle regulating device.

[Explanation of symbols]

 1 Body frame 2 Packing box 3 Packing box tilting device 4 Lift arm 5 Tension arm 6 Telescopic cylinder 7 Packing box side bracket 8 Carcass side bracket

Claims (1)

[Scope of utility model registration request] 1. A tripod dump truck in which a load box mounted on a body frame is tiltably mounted rearward and left and right by a load box tilting device provided between the load box and the body frame. The load box tilting device includes a lift arm whose one end is pivotally supported by a bracket on the load box side which is rotatably attached to the bottom of the load box, and one end of which is pivotally supported by the other end of the lift arm. And a tension arm whose other end is pivotally supported by a bracket on the vehicle body side rotatably attached to the bottom of the vehicle body frame to the left and right, and a telescopic cylinder provided between the lift arm and the tension arm. A load box tilting device for a triple transfer dump truck, characterized in that the lift arm, tension arm, telescopic cylinder, vehicle body side bracket, and load box side bracket are unitized.