JPS6310016B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vehicle body stabilizing device when unloading a dump truck.

In a dump vehicle, especially a dump vehicle with a long loading platform, when the loading platform is dumped up while being located on the ground with a slight slope in the left-right direction of the vehicle,
As the dump truck continues to rise, the vehicle body tilts to the left or right, and the load on the axle loses equilibrium as the center of gravity of the loading platform shifts from the vehicle center. Displacement due to this load is mainly due to the suspension of the axle. The deflection of the springs and tires tends to further increase, resulting in a loss of lateral stability of the vehicle.If this increases, the vehicle may overturn, so it is especially important to semi-fix the axle to the vehicle frame. The purpose of this is to reduce the amount of displacement.

The structure of the present invention is that separate piping is provided on the left and right between the pressurizing piping A of the hydraulic hoist cylinder 2 for dumping and raising the loading platform 1 and the supports 5 fixed to the car frame 4 above the axle 3 on the left and right. A circuit B is connected to and attached to the pressurizing pipe A, and a switching valve 6 is connected in the middle of the pipe circuit B to operate in conjunction with the lifting and lowering of the dump platform 1. teeth,
A spherical seat 12 forms a joint between the support member 7 and a cylinder body 11 having a mounting shaft 10 above which the ram body 8 and return spring 9 are assembled, and an axle 10 located above the cylinder body 11. An elastic body 14 is inserted and fitted between the cylindrical body 13 fixed to the support member 7, and a nut 16 etc. is fitted into the threaded part machined into the shaft part 10 with a push plate 15 placed thereon. It is characterized by the fact that it has been concluded.

An embodiment of the present invention will be described in more detail below based on the drawings.

In FIG. 1, a hinge 26 is provided at the rear of the vehicle frame 4 of the vehicle to pivotally support the cargo platform 1, and a hoist cylinder 2 is provided at the front of the vehicle frame 4 and the cargo platform 1 for pivoting and for dumping the cargo platform 1, Support bodies 5 having the above-described structure are fixedly attached to the left and right vehicle frames 4 on the axle 3 of the vehicle, and two sets of left and right switching valves 6 are provided which are operated by contacting the lower front surface of the loading platform 1.

In FIG. 2, the hydraulic circuit is connected to the left and right supports 5 from the pressurizing pipe A to the hoist cylinder 2 of the dump operating hydraulic circuit consisting of a tank 17, a pump 18, a dump switching valve 19, a main relief valve 20, and a hoist cylinder 2. Two systems of piping circuits B and C are attached to the other side, and in the middle of each piping circuit B and C, there is a switching valve 6 that operates by contacting the front lower surface of the loading platform 1 and a hydraulic circuit on the side of the support body 5. In addition, a relief valve 21 is provided in parallel for the purpose of releasing high pressure when abnormal high pressure that may damage the circuit occurs. Note that if it is assumed that the abnormally high pressure is lower than the durability pressure of the hydraulic circuit at this time, it is not necessary to insert and install the relief valve 21.

As shown in FIG. 3, the support body 5 has a ram body 8 with an elastic body 22 fixed to its lower end and a return spring 9 attached to the inner diameter of the female spherical seat of the support member 7, and a fastening support on the upper part. The male spherical seat on the shoulder of the cylinder body 11 having the shaft portion 10 for
form. The purpose of forming the spherical seat 12 is to make the support 5 follow the planar displacement of the axle 3. The support body 5 further includes an elastic body 14 such as rubber fitted between a cylinder body 13 fixedly provided on the support member 7 and the shaft portion 10 of the cylinder body 11, and a push plate 15 from above.
A nut 16 that is fitted and screwed into the threaded portion of the shaft portion 10.
Fasten and assemble. The elastic body 22 at the lower end of the ram body 8 serves as a buffer when the ram body 8 and the axle 3 come into contact, and the elastic body 14 fitted to the shaft portion 10 It has the role of making the posture at the time opposite to the guide element 23 provided on the axle 3. Note that 24 is an engagement recess.

Next, the operation will be explained based on the above configuration. In Figures 1 and 2, dump switching valve 1
9 to the raised position and send pressure oil to the hoist cylinder 2. At this time, the switching valves 6 of the piping circuits B and C on the support body 5 side are in contact with the lower surface of the loading platform 1 and the circuits are open, so pressure oil is supplied to the cylinder body 11 in the support body 5 shown in FIG. be done. At this time, cylinder body 1
The acting force of the return spring 9 provided in the ram body 8 in the cylinder body 11 is lower than the pressure required for the hoist cylinder 2 to lift the loading platform 1.
Set so that it can be extended. The ram body 8 of the support body 5 provided on the vehicle frame 4 is separated from the axle 3 provided on the vehicle frame 4 by another suspension device before pressure oil is supplied to the piping circuits B and C. However, when pressure oil is supplied to the piping circuits B and C, the ram bodies 8 in the left and right cylinder bodies 11 expand respectively due to the pressure oil, and are placed on the axle 3 and come into contact with the guide 23 and the axle 3. Stop. After the ram body 8 stops, the pressure oil is supplied to the hoist cylinder 2 side to dump and raise the loading platform 1. When the loading platform 1 is lifted up and the contact between the switching valve 6 and the lower surface of the loading platform 1 is released, the hydraulic circuit to the support body 5 is closed. As the loading platform 1 continues to move upward, the load on the axle 3 temporarily increases, but the piping circuits B and C on the support 5 side are closed, and the support 5 and the axle 3 are in contact with each other. So,
No displacement occurs between the vehicle frame 4 and the axle 3. At this time, if there is a road slope in the left-right direction of the vehicle, the center of gravity of the loading platform 1 will move outward from the center of the vehicle as the loading platform 1 rises, and the load applied to the left and right supports 5 will vary by the eccentricity of the center of gravity. However, separate left and right piping circuits B,
Since C is closed, no displacement occurs between the vehicle frame 4 and the axle 3. Therefore, since the load movement is only the vertical deflection of the tires 25, the horizontal eccentricity of the vehicle as a whole is reduced compared to when the support body 5 does not act on the axle 3. Vehicle stability can be improved. This effect is caused by the loading platform 1 lowering the dump switching valve 19 to reach the lowering completion position, and the lower surface of the loading platform 1 and the switching valve 6
contact is maintained until the hydraulic circuit to the support 5 is released.

As explained above, by semi-fixing the vehicle frame and axle to the pressurized piping for lifting the loading platform by dumping, it is possible to reduce the displacement of the loading platform due to the load associated with lifting the loading platform by dumping, thereby achieving the purpose stated at the beginning. be able to.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a general front view, FIG. 2 is an explanatory diagram showing a hydraulic circuit, and FIG. 3 is an enlarged sectional view of section D in FIG. 1. 3 is an axle, 4 is a vehicle frame, 5 is a support body, 6 is a switching valve, 7 is a support member, 8 is a ram body, 9 is a return spring, 10 is a shaft portion, 11 is a cylinder body, 12 is a spherical seat, 13 is a Cylindrical body, 14 and 22 are elastic bodies, 15
is a push plate, 16 is a nut, 19 is a tank switching valve, 2
3 is a guide, 26 is a hinge, A is a pressurized pipe, B,
C is the piping circuit.

Claims (1)

[Scope of Claims] 1. Pressurizing piping for a hydraulic hoist cylinder for dumping and raising a loading platform, and supports fixed to the left and right sides of the vehicle frame located above the traveling axle suspended on the vehicle frame by a suspension device. Separate left and right piping circuits are provided between the dump truck and the pressurized piping, and the piping circuits are connected to the pressurizing piping, and a switching valve that operates in conjunction with the lifting and lowering of the dump truck is connected in the middle of the piping circuit. A vehicle body stabilizing device for unloading a dump truck, characterized in that a ram body provided on a support body is semi-fixedly engaged with an axle. 2. A spherical seat is formed at the joint between the support material of the support body and the cylinder body having the ram body and return spring assembled thereon, and the shaft part located above the cylinder body and the support material. A patent characterized in that an elastic body is inserted and fitted between a cylindrical body fixedly attached to the cylindrical body, and a push plate is further covered and a nut or the like is screwed into a threaded part machined into the shaft part. A vehicle body stabilizing device for unloading a dump truck according to claim 1.