JPH0522263U - Running control device for construction machinery using mono lever - Google Patents

Abstract

(57) [Abstract] [Purpose] A vehicle that can be controlled without changing the lever to improve driving operability and simplify the structure. [Composition] Forward and backward movement of the vehicle and left and right turning operations
In a traveling control device for a construction machine or the like, which is configured to perform with a monolever-1, a cross joint 2 including a rotation shaft 3 in the left-right direction and a rotation shaft 4 in the front-rear direction is provided in the monolever-1, and the rotation shaft 3 in the left-right direction is provided. Is connected to a pressure proportional control valve 6 via a linkage 5 that is interlocked with the rotation, and the rotary shaft 4 in the front-rear direction is
Is connected to a forward-reverse spool 9 of a mission control valve 8 via a linkage 7 that is interlocked with rotation. [Effect] It is possible to control forward / backward and left / right turning by a mono lever, and it is also applicable to control when a pressure proportional control valve and another actuator are combined.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a traveling control device for a construction machine, and more particularly to a traveling control device for a construction machine using a mono lever.

[0002]

[Prior Art]

 Conventionally, as a traveling control device such as a bulldozer, there is a dedicated lever 41 for left and right turning as shown in FIGS. 4 and 5, and a forward and backward lever 42 and a shift lever are respectively used for forward and backward and gear shifting. -43. By moving these levers respectively, the clutch 44 connected to each lever via a circuit or the like is turned off, and the brake 45 is turned on to turn left or right, or the linkage is set. Through this, the spools 47 and 52 of the mission control valve 46 are actuated to move forward and backward and to change gears. 4, 48 is a pressure proportional control valve, 49 is a direction switching valve, 50 is a pilot circuit, 51 is a main circuit, 47 is a forward / reverse spool, 52 is a speed change spool, and 53 and 54 are in FIG. Each is a linkage.

[0003]

[Problems to be solved by the device]

 As for the arrangement of these levers, the left and right steering levers are provided in front of the operator's seat, and the shift lever is arranged on the left side of the operator's seat. Therefore, in the case of control that changes the direction of movement of the vehicle (forward, reverse, right turn, left turn) from forward to right turn, it is necessary to change the lever and the operation becomes troublesome. There was a problem to say.

In view of this, the present invention provides a traveling control device for a construction machine using a mono-lever, which can control the vehicle without changing the lever and improve the driving operability and can simplify the structure. It is provided for the purpose of eliminating the drawbacks of the prior art provided.

[0005]

[Means for Solving the Problems]

 As a means for solving the above-mentioned problems of the prior art, the present invention provides a traveling control device for a construction machine in which each operation of forward and backward movement and left and right turning of a vehicle is performed by a mono lever. A cross joint consisting of a rotating shaft in the forward and backward directions and a rotating shaft in the forward and backward directions is provided.A pressure proportional control valve is connected to the rotating shaft in the left and right direction via a linkage that interlocks with the rotation, and the forward and backward rotation is performed. The shaft is characterized by connecting a forward / rearward movement spool of a mission control valve through a linkage interlocking with rotation.

[0006]

[Action]

 According to the above configuration, since the vehicle can be operated to move forward and backward and to turn left and right with the mono lever, it is not necessary to change the operation lever when switching between operations as in the conventional case, and therefore the driving operability is also improved. it can.

[0007]

【Example】

 FIG. 1 is an operation system diagram showing an embodiment of a traveling control device for a construction machine by a monolever according to the present invention, and FIG. 2 is an example of a detailed structure of a cross joint part embodying the portion P of FIG. In a side view, FIG. 3 is a sectional view taken along line AA of FIG.

The present invention relates to a traveling control device for a construction machine (such as a bulldozer) in which a monolever-1 is used to perform forward / backward and left / right turning operations of a vehicle. A cross joint 2 composed of a shaft 3 and a rotary shaft 4 in the front-rear direction is provided, and a pressure proportional control valve 6 is connected to the rotary shaft 3 in the left-right direction via a linkage 5 that interlocks with the rotation, and in the front-rear direction. The rotary shaft 4 is composed of a forward / reverse scroll 9 of a mission control valve 8 connected to the rotary shaft 4 via a linkage 7 which is interlocked with the rotation.

In the embodiment shown in FIGS. 2 and 3, the cross joint 2 provided in the lower portion of the mono-lever-1 is a bifurcated tubular body 2a into which a rotary shaft 3 in the left-right direction is fitted, and a tubular body. 2a and a rotary shaft 4 in the front-rear direction that is fixed at a right angle to the base of the base 2a. The rotary shaft 4 is rotatably supported by a support member 10 on the fixed side via a bearing 11, and the shaft end is provided with a front-rear direction. The lever member 7a of the linkage 7 reaching the advancing spool 9 is integrally fixed by a key 12. Bearings 13 are provided on the inner diameter side of the tubular body 2a so that the rotary shaft 3 can rotate, and an annular body 14 inserted between the bifurcated tubular bodies 2a is provided at the center of the rotary shaft 3. The pin 15 is fitted into the rotary shaft 3 and penetrates the rotary shaft 3. Further, a lever member 16 having a U-shape in top view, which is interlocked with the rotation of the annular body 14, is provided outside the annular body 14 so as to avoid interference with the lever member 7a, and one end of the U-shape is provided. The monoproper-1 base is connected to the other end through the linkage 5 of the pressure proportional control valve 6 shown in FIG. The seals of the bearings 11 and 13 and the like are not shown in the figure because they are not directly related to the gist of the present proposal.

In FIG. 1, the pressure proportional control valve 6 is provided with four stems 6a that can be pressed on the upper surface, and the hydraulic pressure of the pressure proportional control valve 6 is controlled by pilot circuits 17a, 17b, 17c, 17d. It is connected to a steering valve 18 and a brake valve 19 each having three positions (a, b, c), and by switching each of these valves from neutral to left or right, the hydraulic pressure from a pump (not shown) is applied to the main circuit. It is connected so that the clutch 21 on either side flows from 20a or 20b to the clutch and the brake, and the clutch 21 on the flowing side is turned off and the brake 25 is turned on. The clutch 21 is composed of a pair of left and right clutch plates 22a and 22b, clutch pistons 23a and 23b, and a spring 24 that constantly engages the clutch plates 22a and 22b. The left and right brake pistons 26a and 26b, the brake plates 27a and 27b, the spring 28, and the like, respectively. On the other hand, a shift lever 29 is provided in the middle of the linkage 7 in parallel with the mono lever 1. The shift lever 29 is connected to the shift spool 31 of the mission control valve 8 via the linkage 30. It is connected.

Next, the operation will be described. 1 to 3, in order to turn right from the neutral position to turn the clutch on the right side, when the mono-lever-1 is tilted to the right turn, the rotary shaft 3 rotates together with the annular body 14. Along with this, the U-shaped lever member 16 also rotates about the rotary shaft 3 as a fulcrum of rotation, so that the other end connected to the linkage 5 also rises, and as a result, the lower end of the linkage 5 moves. For tilting, one side of the top of the stem 6a of the pressure proportional control valve 6 is pushed to switch the pressure proportional control valve 6 from the neutral position, so that the hydraulic pressure from the pilot pump (not shown) passes through the pilot circuits 17a and 17b. First, the steering valve 18 and then the brake valve 19 are operated to switch from the neutral position c to the a position. Therefore, the hydraulic pressure from a pump (not shown) passes through the main circuit 20a and acts on the clutch piston 23a to resist the clutch plate 22a against the spring 24 to turn off the clutch 21, and then the brake piston 26a resists the spring 28. Then, the brake 25 is pressed and the brake 25 is turned on. Therefore, the vehicle stops on the right side, and turns on the left side by turning around the left side. The steering valve 18 and the brake valve 19 automatically return from the position a to the position c when the stem 6a is no longer pressed. In the case of turning to the left, it can be performed by the reverse operation to the above. Further, in the case of forward movement, if the mono-lever-1 is tilted forward, the pressure proportional control valve 6 does not move, the forward / backward scroll 9 of the mission control valve 8 is switched to forward via the linkage 7, and the vehicle moves forward. To do. In this case, when the gear shift lever 29 is operated to change the speed stage, the gear shift spool 31 moves in the mission control valve 8 to switch the gear shift clutch (not shown) to achieve a desired speed. can get.

[0012]

[Effect of the device]

 As described above, the present invention relates to a traveling control device for a construction machine, in which a monolever is used to perform forward / backward and left / right turning operations of a vehicle. A cross joint consisting of rotating shafts in the forward and backward directions is provided, and a pressure proportional control valve is connected to the rotating shafts in the left and right directions via a linkage that is linked to the rotation. -Since the forward / reverse spool of the mission control valve is connected via a valve, forward / backward and left / right turning can be controlled by a mono lever, and control is possible when a pressure proportional control valve and other actuators are combined. Can also be applied.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of an operation system of a traveling control device for a construction machine using a mono lever according to the present invention.

FIG. 2 is a side view for explaining one embodiment of the structure of the cross joint portion that embodies the portion P of FIG.

3 is a detailed explanatory view showing an enlarged AA cross section of FIG. 2. FIG.

FIG. 4 is an explanatory diagram of an operation system using a conventional operation lever for left / right turning.

FIG. 5 is an explanatory diagram of a conventional operating system for forward and backward and shift levers.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Monolever 2 Cross joint 3 Rotational axis in the left-right direction 4 Rotational axis in the front-rear direction 5 Linkage 6 Pressure proportional control valve 7 Linkage 8 Mission control valve 9 Forward-reverse spool

Claims (1)

[Scope of utility model registration request] 1. A traveling control device for a construction machine, wherein a monolever is used to perform forward and backward and left and right turning operations of a vehicle. In the monolever, a horizontal rotation axis and a longitudinal rotation axis are provided to the monolever. It is equipped with a cross joint, and a pressure proportional control valve is connected to the left and right rotating shafts via a linkage interlocking with rotation, and a transmission is connected to the front and rear rotating shafts via a linkage interlocking with rotation. A traveling control device for a construction machine by means of a monolever, characterized by connecting forward and backward spools of a control valve.