JPH0529852U - Tilt angle control device for the tilting device of the packing box in the three-wheel dump truck - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a tilt angle regulation means for regulating the tilting operation when the packing box is tilted to the left and right when the packing box is tilted to a predetermined angle. The packing box tilting device switches a check valve 100 of a hydraulic circuit and supplies the check box 100 of a hydraulic circuit from a hydraulic pump 110 to a piston chamber 66 of a telescopic cylinder 6 when a tilting operation of the packing box to the left and right reaches a predetermined angle. A tilt angle regulating means for returning the pressure oil to the oil reservoir 112 is provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a tilting angle control device for a packing box tilting device that tilts a packing box in a three-turn 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]

 Here, the extension stroke of the telescopic cylinder for tilting the load box to the maximum tilt angle when tilting the load box of the three-wheel dump truck to the left and right is the same as that of the telescopic cylinder when tilting the load box rearward. A stroke that is less than half of the stroke is enough.If the telescopic cylinder is extended more than this, there is a problem that the tilting device of the packing box interferes with the peripheral members, and there is a risk of falling and the like. It was necessary to have a means for restricting the tilting movement of the packing box when the packing box reached a predetermined tilting angle during tilting.

[0004]

[Means for Solving the Problems]

 The tilt angle control device for the load box tilting device in the three-wheel dump truck according to the present invention is designed so that the load box mounted on the body frame can be moved to the rear and right and left sides by the load box tilting device provided between the load box and the body frame. In a three-wheel dump truck that can be tilted freely, the load box tilting device switches the check valve of the hydraulic circuit when the tilting movement of the load box to the left and right reaches a predetermined angle, and The tilt angle regulating means for returning the pressure oil supplied to the piston chamber of the telescopic cylinder to the oil reservoir is provided.

[0005]

[Operation] When the load box is tilted to the left or right, when the load box tilts to a predetermined angle, the tilt angle control means switches the check valve of the hydraulic circuit to supply the pressure oil supplied from the hydraulic pump to the piston chamber of the telescopic cylinder. By returning it to the oil reservoir, the expansion of the telescopic cylinder is restricted, which restricts the tilting movement of the cargo box.

[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, when the packing box is tilted to the left or right, when the packing box is tilted to a predetermined angle, the tilt angle restricting means switches the check valve of the hydraulic circuit to expand and contract from the hydraulic pump. By returning the pressure oil supplied to the piston chamber of the cylinder to the oil reservoir, the expansion of the telescopic cylinder can be regulated, and the tilting movement of the cargo box can be regulated by this. It is possible to prevent interference and falls.

[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 Tilt Device 9 Tilt Angle Control Device (Tilt Angle Control Means) 100 Check Valve 110 Hydraulic Pump 112 Oil Reservoir 113 Bypass Circuit

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Masakazu Morimoto, 3-4-2, Shite, Tsurumi-ku, Yokohama-shi, Kanagawa Shinmeiwa Industry Co., Ltd.

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 packing box tilting device switches the check valve of the hydraulic circuit when the tilting operation of the packing box to the left and right reaches a predetermined angle,
A tilt angle restricting device for a load box tilting device in a triple transfer dump truck, comprising tilt angle restricting means for returning pressure oil supplied from a hydraulic pump to a piston chamber of a telescopic cylinder to an oil reservoir.