JPH04128982U - Steering mechanism of work vehicle - Google Patents

Abstract

(57) [Summary] [Purpose] This is to enable sharp turns and interlining turns when working while turning in a narrow space, such as with an aerial work vehicle. [Configuration] It is possible to drive the front two wheels 2.2 and the rear two wheels 3.3. In the normal "front wheel mode", only the front two wheels 2.2 are steered and rotated, but the steering lever 7 is configured to rotate the rear two wheels 3 in the opposite phase direction when the steering wheel 7 is tilted beyond a certain angle.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention is a vehicle that performs work in narrow spaces, such as aerial work vehicles, while making sharp turns. Concerning the steering mechanism of vehicles.

0002

[Conventional technology]

Conventionally, in aerial work vehicles, there is a technique to drive the four wheels and rotate the four wheels for steering. The technique is known to the public. For example, the technique described in Japanese Utility Model Application Publication No. 2-33730 It's like a technique.

0003

[Problem that the idea aims to solve]

Conventionally, in aerial work vehicles, each drive steering wheel can be steered and rotated separately. , "Front wheel mode" in which steering is performed using only the front two wheels, and "Front wheel mode" in which the front two wheels and rear two wheels are steered in the same phase direction. This enabled a "diagonal mode" of steering rotation. This invention is based on the In "Wheel Mode", conventionally only the front wheels were operated in response to rotation of the steering lever. Since the steering wheel rotates, if the rear wheels are also configured to be driven, a certain fixed angle example For example, if the steering wheel turns more than 37 degrees, it may roll over, so avoid steering more than a certain angle. Even if you turn the steering lever, the steering angle of the front two wheels will not increase further. It was structured like this. Therefore, in the case of "front wheel mode", it is not possible to make sharp turns. There was a problem. In this invention, in the case of "front wheel mode" , if the steering lever is tilted beyond a certain angle of 37 degrees. In this case, a sharper turn is required, so it is recommended to turn the rear two wheels in the opposite phase direction. This made it possible to make sharp turns.

0004

[Means to solve the problem]

Next, means for solving the problem will be explained. In other words, it is possible to drive all four wheels of a four-wheeled work vehicle. By operating one steering lever 7 360 degrees forward, backward, left and right, the steering wheel can be adjusted. In a configuration in which the aircraft moves in the direction in which the steering lever 7 is tilted, the steering lever While the bar 7 tilts from the straight direction to a certain angle, only the front two wheels are steered and rotated, and the rear The wheels are driven in a straight line, and if the steering lever 7 is rotated beyond the certain angle, In this case, the two rear wheels are steered and rotated in the opposite phase to the two front wheels.

[0005]

[Effect]

Next, the effect will be explained. As shown in Figures 5 and 6, in the case of "front wheel mode" , the tilt angle of the steering lever 7 is within 37 degrees left and right with respect to the straight-ahead direction. In this case, only the front two wheels of the steering drive wheels 2 and 3 rotate left and right. . Then, the steering lever 7 is rotated beyond the range of 37 degrees left and right. As the steering drive wheels 2 and 3 are rotated more than 37 degrees, the rear two wheels move in the opposite phase direction. It is tilted at an angle of more than 37 degrees. This allows work vehicles to be smaller This makes it possible to turn within the turning radius.

[0006]

【Example】

Next, an example will be described. Figure 1 is a side view showing an aerial work vehicle among work vehicles, and Figure 2 3 is a plan view showing the traveling platform 12 of the aerial work vehicle, and FIG. 3 is a four-wheel drive steering vehicle. A plan view showing the wheel operation mechanism, Fig. 4 is a plan view of operation box B, and Fig. 5 shows the front two wheels and the rear. A plan view of the two wheels being steered and rotated in opposite phases. Figure 6 shows the tilting of the steering lever 7. FIG. 3 is a plan view showing directions.

[0007] The aerial work vehicle has scissors between the upper work platform 11 and the lower traveling trolley 12. They are connected by a link 13. The scissor link 13 is used to expand and contract the lifting cylinder 14. It is configured to be able to go up and down more easily. An operation box B and a foot are installed on the workbench 11. A switch 5 is provided, which is a steering mode switching switch provided in the operation box B. By switching the switch 6 and stepping on the foot switch 5, the steering drive wheels 2 and 2 can be ・3.3 is set and rotated to the initial setting position of "front wheel mode" and "diagonal mode". Then, by rotating the steering lever 7 360 degrees in the desired direction, The aircraft is steered in that direction in various steering modes.

[0008] This will be explained with reference to FIG. The traveling trolley 12 includes a lower operation box C and a battery. , a DC motor driven by the battery, and a DC motor driven by the DC motor. A hydraulic pump is installed. Each steering wheel is controlled by pressure oil from the hydraulic pump. The hydraulic motors arranged at 2, 2, 3, and 3 are driven, and the steering drive wheels 2, 2, 3, and 3 to drive and rotate. And the front two wheels 2.2 and the rear two wheels 3.3 are respectively They are steered and rotated as a pair.

[0009] That is, the steering cylinder 15 rotates the front two wheels 2 through the tie rod 1. The two rear wheels 3 and 3 are rotated at the same time via the tie rod 4 by the expansion and contraction of the steering cylinder 17. The steering wheel is rotated in the same direction. Then, the steering rotation position of the two front wheels 2 and 2 is determined by the steering position sensor. The steering rotation position of the two rear wheels 3 and 3 is detected by the steering position sensor 16. Detect more. In FIG. 4, a plan view of the surfaces of operation boxes B and C is disclosed. ing. The operation box B includes a work platform lift operation lever 8 and a steering lever 7. and a steering mode changeover switch 6. Then, turn the steering mode switch. When the steering mode is changed using key 6, the information to be displayed on the steering mode display device 30 is It consists of

0010 By tilting the steering lever 7 normally, as shown in Fig. 6, When the steering lever 7 is tilted within the range of 37 degrees left and right, the From the situation, only the front two wheels 2 and 2 rotate within a range of 37 degrees left and right in the same phase. Ru. Conventionally, when the steering lever 7 is rotated by 37 degrees or more, Because it is dangerous, the steering angle of the two front wheels 2 and 2 is configured so that it does not exceed that range. That's what I was doing. However, in the present invention, the angle of the steering lever 7 is lower than 37 degrees. In response to the above rotation, the front two wheels 2 and 2 also rotate, but this alone poses a risk of rollover, etc. Therefore, the two rear wheels 3 are configured to rotate in opposite phase directions. maximum If the steering lever 7 is rotated 90 degrees to the left or right, which is the limit, the front 2 Drive rotation with wheels 2, 2 and rear wheels 3, 3 facing completely opposite left and right directions. Therefore, the interlining turns at the center position of the traveling carriage 12.

[0011]

[Effect of the idea]

Since the present invention is constructed as described above, it has the following effects. That is, , in the case of "front wheel mode" steering, left and right with respect to the straight ahead direction, which is a fixed angle. If the vehicle is tilted beyond the range of 37 degrees, the rear two wheels may be steered in the opposite phase direction. This enabled the aircraft to make sharp turns without rolling over. . In addition, by tilting the steering lever 7 90 degrees to the left or right, the front two wheels Since 2.2 and the rear two wheels 3.3 run in completely opposite directions, interlining turns are possible. It was.

[Brief explanation of drawings]

FIG. 1 is a side view showing an aerial work vehicle among work vehicles.

FIG. 2 is a plan view showing a portion of the traveling trolley 12 of the aerial work vehicle.

FIG. 3 is a plan view showing the operating mechanism of the four-wheel drive steering wheel.

FIG. 4 is a plan view of the operation box B.

FIG. 5 is a plan view of a state in which the two front wheels and the two rear wheels are steered and rotated in opposite phases.

6 is a plan view showing the tilting direction of the steering lever 7. FIG.

[Explanation of symbols]

1 tie rod 2 Front 2 wheels 3 Rear 2 wheels 4 Tie rod 5 Foot switch 6 Steering mode selector switch 7 Steering lever 8 Work platform lift operation lever

Claims (1)

[Scope of utility model registration request] [Claim 1] The four wheels of a four-wheeled work vehicle can be driven,
In a configuration in which the aircraft is moved in the direction in which the steering lever 7 is tilted by operating one steering lever 7 360 degrees forward, backward, left, and right, only the front two wheels are moved while the steering lever 7 is tilted from the straight direction to a certain angle. When the steering lever 7 is rotated and the rear wheels are driven in a straight line, and the steering lever 7 is rotated beyond the certain angle, the two rear wheels are rotated to the front two.
A steering mechanism for a work vehicle characterized by steering rotation in the opposite phase to the wheels.