JPS6020527Y2 - Steering equipment for skid steer type industrial vehicles - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a steering device for a skid steer type industrial vehicle.

In general, steering-type industrial vehicles control the tilting direction and angle of the swash plate of each hydraulic pump for the left and right wheels by tilting two steering levers located on the left and right front of the driver's seat. The system controls the rotational direction and speed of the left and right wheels to steer the vehicle.

Therefore, when the vehicle is running, both of the above-mentioned steering levers must be operated with both hands, which not only makes it impossible to operate them in conjunction with cargo handling operations, but also makes it impossible to operate them in combination with cargo handling operations. When a backhoe is equipped, cargo handling operations are performed from the driver's seat on the backhoe side, so if you want to move the vehicle slightly forward or backward during cargo handling, you can use the two steering levers with both hands from above the driver's seat on the backhoe side. It is difficult and troublesome to operate the machine, and it is also extremely troublesome to return from the backhoe side driver's seat to the vehicle side driver's seat each time.

The present invention was developed with the aim of eliminating the above-mentioned conventional problems, and is a steering system for skid steer type industrial vehicles in which a tie rod is placed horizontally between both steering levers to enable one-handed operation for straight-ahead driving. This is what we are trying to provide.

. Hereinafter, illustrated embodiments embodying the present invention will be described in detail.

Figure 1 shows backhoe B as an attachment for cargo handling equipment.
This is an example of a skid steer type industrial vehicle equipped with The steering lever 3 controls the inclination direction and angle of the swash plate of a hydraulic pump (not shown) for the right wheel, and from this controls the left and right wheels 4 individually forward or backward via a hydraulic motor (not shown).
, 3' are rotated at a desired speed according to the inclination of the wheels.

In such a vehicle, a tie rod 5 is horizontally suspended between the left and right steering levers 3, 3', thereby connecting the levers 3, 3' to each other.

The tie rod 5 has a grip portion 6a in the center that can be gripped with one hand.
A crank-shaped hollow rod 6 with
Two solid rods slidably fitted on either side of the 7.7
', and the protruding end of the solid rod 7.7' is a wrapped band-like body which is held around the steering levers 3, 3' so as to be rotatable about the axes of the steering levers 3, 3'. It is attached via rod holders 8, 8'.

Therefore, one rod holder 8 (on the right in the figure) is formed into a split mold from two elastic plates so that it can be removed from the steering lever 3 if necessary, and the ear part 8a at one end is attached to a port 9. fixed, and the ear part 8 on the other end
b is rotatably connected to a connecting portion 7a formed on a protruding portion of one of the solid rods 7 of the tie rod 5 by a pin 10.

The other rod holder 8' is formed from a single elastic plate, rotatably holds the steering lever 3', and its ear 8a' connects the other solid rod 7'. The portion 7a' and the pin 10' are rotatably connected.

Note that 11.11' is a pin for preventing the rod halters 8, 8' from slipping down, and is welded or attached to the steering levers 3, 3'.

As mentioned above, in this embodiment, the left and right steering levers 3, 3' are connected by a tie rod 6,
Therefore, the vehicle can be advanced by tilting the steering levers 3, 3' with both hands as in the past, but the handle 6a formed in the center of the tie rod 5 can be pushed forward with one hand or This can also be done by pulling the steering levers 3, 3' back and forth with equal force.

Further, as described above, the tie rod 5 is composed of the hollow rod 6 and the solid rods 7 and 7' slidably fitted into the hollow rod 6, and is freely expandable and contractable in the axial direction, and has rod holders 8 and 8'. Since the steering levers 3 and 3' are rotatably attached to the steering levers 3 and 3', both steering levers 3 and 3' are allowed to tilt in different directions and at different angles at the same time, as shown by the imaginary lines in FIG. Therefore, with the tie rod 5 still attached, the vehicle can be controlled by appropriately tilting both steering levers 3, 3' with both hands as in the conventional manner.

In other words, the steering device of this embodiment does not prevent the conventional two-handed operation of the steering levers 3, 3', and allows one-handed operation for straight-ahead travel. It is possible to carry out cargo handling operations with one hand (when the attachment is a shovel loader), and during cargo handling operations on the driver's seat 2 of backhoe B as shown in Fig. 1, the vehicle can be moved forward or backward. When it becomes necessary to move the camera to the camera, this can be done with one hand, which is much easier than moving it with both hands.

In addition, when the tie rod 5 is not needed, one side (right side in the figure)
After removing the rod holder 8 from the steering holder 3, rotate the tie rod 5 toward the other steering lever 3' as shown by the imaginary line in FIG. 4, and attach the rod holder 8 to the steering lever 3'. It won't get in the way.

Next, another embodiment shown in FIG. 6 will be described.

In this embodiment, an engaging portion 12 having an engaging hole 12a is formed in one rod holder 8 (on the right side in the figure), and a tie rod 5
For this purpose, an engaging pin 13 is provided at the tip of the solid rod 7 to be able to engage and disengage from the engaging hole 12a, and an operating pin 14 is provided at an appropriate location on the solid rod 7 to protrude in the radial direction. The solid rod 7 is slidably engaged in an elongated axial hole 15 formed in the hollow rod 6, and is urged outwardly by a spring 16 housed in the hollow rod 6, and the lower part of the other steering lever 3' A rod clamp 17 made of a leaf spring is provided to clamp and hold the tie rod 5.

Therefore, in this embodiment, the tie rod 5 can be easily engaged and disengaged from the rod holder 8 by sliding the solid rod 7 using the operating pin 14, and when unnecessary, the other steering lever 3' can be moved as shown by the imaginary line. In this embodiment, the engagement pin 13 is displaced from the engagement hole 12a even when the steering levers 3 and 3' are operated forward and backward, respectively. The length of the elongated hole 15 is set so that there is no problem.

As described in detail above, the present invention is a skid steer type industrial vehicle in which the vehicle is steered by two steering levers, in which both of the steering levers are connected by a telescoping tie rod, and both ends of the tie rod are used to steer the vehicle. It is attached to the lever so that it can rotate around the axis of the steering lever, and therefore, according to the present invention, it is possible to operate the steering lever in a straight line with one hand without interfering with the conventional operation of the steering lever with both hands. This is very advantageous when it is easy to operate the vehicle in a straight line, and in the straight-line condition, it is desired to move the vehicle forward or backward while excavating with one hand.

Also, since the tie rod is located in front of the driver's seat,
This prevents the driver from jumping forward when the vehicle is stopped, which is also effective from a safety standpoint.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; Fig. 1 is a side view of a skid-steer industrial vehicle equipped with a backhoe, Fig. 2 is a front view of the vehicle mainly showing the driver's seat and steering lever, and Fig. 3 is a side view of a skid-steer industrial vehicle equipped with a backhoe. 4 is a front view showing essential parts of the present invention, FIG. 5 is a plan view of the same, and FIG. 6 is a partially cutaway sectional view showing another embodiment. 1...Vehicle, 2...Driver's seat, 3.3'
... Steering lever 5 ... Tie rod 6 ... Hollow rod, 7.7' ...
・Solid rod, 8.8'...Rod holder.

Claims (1)

[Scope of utility model registration request] In a skid steer type industrial vehicle in which the vehicle is steered by controlling the left and right wheels by tilting steering levers placed in front of the left and right sides of the driver's seat, both the left and right steering levers are connected to hollow rods with grips. and a rod slidably inserted into the hollow rod by a tie rod configured to be expandable and retractable in the axial direction, and both ends of the tie rod are rotated about the axis of the steering lever with respect to the steering lever. Furthermore, one end of the tie rod is removably attached to one steering lever, and
A steering device for a skid steer type industrial vehicle whose other end is attached to the other steering lever so that it can rotate around a horizontal axis.