JP2538707Y2 - Operating device for traveling - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a track-operated construction machine such as a hydraulic shovel, and a driving device for a working vehicle.

[0002]

2. Description of the Related Art FIG. 3 is a perspective view showing the vicinity of a driver's seat 1 of a hydraulic shovel (not shown) provided with a conventional operating device for traveling. In the figure, 2 is a floor plate, 3L and 3R
Is a pair of left and right traveling operation levers, 4L and 4R are road surface members fixed to the traveling operation levers 3L and 3R, respectively.
5L and 5R are left and right working control levers, 6L and 6R
Are left and right control boxes.

FIG. 4 is a main part circuit diagram showing a conventional traveling operating device. In the figure, 3L and 3R are a pair of traveling operation levers, 7 and 8 are forward operation levers operated by a traveling operation lever 3L (hereinafter referred to as traveling lever 3L), respectively.
Reverse pilot valve, 9 and 10 are operating levers 3R for traveling
(Hereinafter referred to as traveling lever 3R) operated by forward and backward pilot valves, 11L and 11R are left and right traveling motors, and 12L and 12R are traveling motors 11L and 11R.
A pilot switching valve for control, 13 and 14 are main pumps, 15 is a pilot pump, and 16 is an oil tank. The codes Ei, Loro, Harha, Nini are
Each shows the connection of the pilot pipeline.

Next, a conventional operation device for traveling will be described with reference to FIGS. 3 and 4. FIG. By operating the pair of traveling levers 3L and 3R forward or backward from the neutral position N, respectively, the pilot pressure is derived from the pilot valve (any one of 7, 7, and 10),
The pilot pressure is applied to a pair of traveling pilot switching valves 12.
L, 12R pilot pressure receiving parts (17, ~,
20 to control the pilot switching valves 12L and 12R to operate the left and right traveling motors 11L and 11R.

[0005]

In the prior art traveling operating device, the traveling levers 3L and 3R are tilted forward from the neutral position when the hydraulic excavator moves forward, and the traveling levers 3L and 3R are operated when traveling backward. Had to be tilted backward from the neutral position. When the driver operates the excavator, the driver must operate other operation levers other than the traveling levers 3L and 3R. However, the operation of the traveling levers 3L and 3R in the front-rear direction requires moving the hand (or foot) considerably. It was troublesome because I had to do it. It is easy to operate the traveling levers 3L and 3R only in one direction, for example, to pull them backward (to the front of the driver), but to operate the traveling levers 3L and 3R to protrude forward requires considerable labor. Was. The problem to be solved by the present invention is the above problem.

[0006]

SUMMARY OF THE INVENTION The present invention provides a pilot circuit for a traveling pilot switching valve mounted on a tracked vehicle.
A pair of pilot valves that operate when the left and right operation levers are operated in one direction are provided.Electromagnetically open and close the pipes that communicate the pair of pilot valves and the pilot pressure receiving part of the traveling pilot switching valve. The valve is interposed, and on the other hand, a selection switch is provided in the electric circuit of the solenoid on-off valve
The electromagnetic switch valve is operated by operating the selection switch.

[0007]

FIG. 1 is a circuit diagram of a main part of a hydraulic excavator provided with a traveling operating device according to the present invention. In the figure, the same reference numerals are given to components using the same components as the conventional technology. 21L and 21R are a pair of traveling operation levers, 2
2, 23 are operation levers for traveling (hereinafter referred to as traveling levers).
Pilot valves connected to 21L and 21R respectively, 24 are pilot pressure hydraulic pressure sources, 25, 26, 27, 2
8 is a pilot switching valve for controlling various hydraulic actuators (not shown) mounted on the hydraulic shovel,
29, 30, 31, and 32 are solenoid on-off valves provided in pilot circuits of the traveling pilot switching valves 12L and 12R, respectively, 29 is an electric circuit, 30 and 31 are double-push switch type selection switches, and 32 is a power supply. It is.

FIG. 2 is a plan view of a main portion near the driver's seat 1 'showing the arrangement of the traveling levers 21L and 21R and the selection switches 30 and 31. 33L and 33R are control boxes, respectively, and the symbol marks FL and RL are forward push positions and reverse push positions of the selection switch 30, respectively.
The symbol marks FR and RR are a forward push position and a reverse push position of the selection switch, respectively.

Next, the configuration of the traveling operation position of the present invention will be described with reference to FIGS. Traveling pilot switching valve 1
The 2L and 12R pilot circuits are provided with a pair of pilot valves 22 and 23 that operate when the left and right traveling levers 21L and 21R are operated in one direction, respectively. The pair of pilot valves 25 and 23 and the traveling pilot switching valve are provided. 12
L and 12R pilot pressure receiving parts 17, 18, 19,
Solenoid valves 25 and 2 respectively in pipes communicating with
6, 27, 28, while the solenoid on-off valves 25,
, 28 are provided with selection switches 30 and 31, and the solenoid on / off valve is operated by operating the selection switches. In this embodiment, the double-button switch type selection switches 30 and 31 are used. However, other types of selection switches may be used.
The positions of the selection switches 30 and 31 are not limited to the control box 33 (shown in FIG. 2), but may be the driver's seat 1 '.
It may be set to another nearby position.

Next, the operation of the traveling operating device of the present invention will be described. The travel levers 21L and 21R are each configured to be operated in only one direction. If the travel levers 21L and 21R are set to be tilted rearward (pulled toward the driver) and operated, the travel levers 21L and 21R cannot be operated forward. When the excavator moves forward, first, the FL and FR positions of the selection switches 30 and 31 are turned on. The contacts E and F of the selection switch 30 and the contacts S and H of the selection switch 31 are closed, respectively. Since the solenoids 34 and 35 of the solenoid on-off valves 25 and 27 are energized, the solenoid on-off valves 25 and 27 are both switched from the shutoff oil passage position to the open oil passage position. And the running lever 21L
And 21R are tilted in one direction, for example, backward, the pilot pressure from the pilot pressure hydraulic source 24 passes through the pilot oil passage position of the pilot valve 22 and the solenoid on-off valve 25, and then to the pilot pressure receiving portion 17 and to the other end. Acts on the pilot pressure receiving portion 19 through the opening oil passage position of the pilot valve 23 and the electromagnetic on-off valve 27. Then, the traveling pilot switching valves 12L and 12R are both switched to the forward oil passage position, so that the hydraulic shovel moves forward.

Next, when the excavator moves backward, the RL position and the RR position of the selection switches 30 and 31 are respectively turned on. The contacts of the selection switch 30 and the contacts of the selection switch 31 are closed. Since the solenoids 36 and 37 of the solenoid on-off valves 26 and 28 are energized, the solenoid on-off valves 26 and 28 are both switched from the shutoff oil passage position to the open oil passage position. When the traveling levers 21L and 21R are tilted backward in the same manner as when the traveling levers 21L and 21R move forward, one of the pilot pressures from the pilot pressure hydraulic source 24 passes through the pilot oil passage positions of the pilot valve 22 and the solenoid on-off valve 26, Pressure receiving part 18
The other acts on the pilot pressure receiving portion 20 through the open oil passage position of the pilot valve 23 and the electromagnetic on-off valve 28. Then, since both the traveling pilot switching valves 12L and 12R are switched to the reverse oil passage position, the hydraulic shovel performs reverse travel.

The description of the case where the hydraulic excavator performs the spin turn and the pivot turn will be omitted, but the driver can select the switches 30 and 3 regardless of the traveling state.
A required push position is selected and turned on, and the traveling levers 21L and 21R are tilted in one direction, for example, backward. When the mounting position or the shape of the traveling operation lever is different from that in this embodiment, it may be better to set one operation direction to the front.

[0013]

As described above, the present invention operates when the left and right traveling control levers are operated in one direction in the pilot circuit of the traveling pilot switching valve mounted on a tracked vehicle such as a hydraulic shovel. A pair of pilot valves is provided, and a solenoid valve is interposed in a pipe communicating the pair of pilot valves and the pilot pressure receiving portion of the traveling pilot switching valve. A selection switch is provided, and the electromagnetic switch valve is operated by operating the selection switch. Thus, when the hydraulic excavator travels, the driver may select a required pressing position of a selection switch provided near the driver's seat, turn on the operating switch, and tilt the traveling operation lever in one direction, for example, backward. The traveling operation lever is no longer tilted forward or backward from the neutral position unlike the traveling operation device of the prior art. Therefore, the driving operation of the driver becomes easy, labor and fatigue thereof can be reduced, and labor can be saved.

[Brief description of the drawings]

FIG. 1 is a main part circuit diagram of a hydraulic excavator provided with a traveling operating device of the present invention.

FIG. 2 is a plan view of a main part in the vicinity of a driver's seat, showing an arrangement of a traveling operation lever and a selection switch according to the present invention.

FIG. 3 is a perspective view showing the vicinity of a driver's seat of a hydraulic shovel provided with a conventional operation device for traveling.

FIG. 4 is a main part circuit diagram showing a conventional driving device for traveling.

[Explanation of symbols]

 1, 1 'Driver's seat 3L, 3R, 21L, 21R Operating lever 7, 7, 10, 22, 23 Pilot valve 11L, 11R Running motor 12L, 12R Pilot switching valve 25, 28, 28 Electromagnetic switching valve 29 Electric circuit 30, 31 Selection switch

Claims (1)

(57) [Scope of request for utility model registration] A pilot pressure is derived from a pilot valve by operating a pair of traveling operation levers, and the pilot pressure is applied to pilot pressure receiving portions of the pair of pilot switching valves, respectively. In a tracked vehicle in which the left and right traveling operation levers are operated in one direction in a pilot circuit of the traveling pilot switching valve, a pair of pilots are operated. A valve is provided, and an electromagnetic on-off valve is provided in each of the pipelines communicating the pair of pilot valves and the pilot pressure receiving portion of the traveling pilot switching valve, while a selection switch is provided in the electric circuit of the electromagnetic on-off valve. And a driving control device for driving the electromagnetic opening and closing valve by operating the selection switch. Device.