JPS5830763Y2 - Brake lock valve for hydraulically driven wheel vehicles - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a brake lock valve for a hydraulic single drive wheel type vehicle.

For hydraulically driven wheeled vehicles equipped with rotating work equipment, a manually operated brake lock valve is installed in the hydraulic circuit of the wheel brake to prevent vehicle and body movement during work. It is known that the braking condition can be maintained.

However, the brake lock valve is manually locked and released, so if you forget to operate it or operate it erroneously, the wheel brake may run for 1 degree while braking, or start work without locking. However, it has a problem.

was devised in view of the above circumstances, and its [
The first object is to provide a brake lock valve for a hydraulic single drive wheel type vehicle that is always in a locked position, becomes a release position by pressure in a hydraulic drive traveling circuit, and can be operated to the release position by mechanical means. be.

Hereinafter, embodiments of the invention will be described with reference to drawings F.

In FIG. 1, reference numeral 8 and 10 indicate a hydraulic 1-drive running route, and the 111-outlet 11a of the running hydraulic pump 11 is connected to the 1st, 2nd, 1st and 2nd passages of the running hydraulic pump 11 through the directional control valve 12. The second circuit 13, 14 is connected to either 2, the first . The second circuits 13 and 14 are connected to the forward and reverse ports 1a and 1b of the L-row motor 1.

2 is a wheel brake, and its brake cylinder 3
Connect to 9 1-Also, brake front pipe 37 is connected to Hydromaster 3
6. It is connected to the brake operation hydraulic system consisting of a master cylinder 35, and the brake operation 37 is equipped with a brake valve 16 according to the present invention.

Refer to Figure 2 below and set the brake lock valve 16 to 1.
explain.

In FIG. 2, reference numeral 20 indicates a brake valve body, which has a brake oil inlet/outlet 21, a pilot pressure oil inlet/outlet 22, and a piston housing bore portion 23.

A portion of the bore 23 is closed by left and right plugs 24 and 25, and a piston 26 is slidably accommodated therein.

The chamber 27 formed on one side of the piston 26 and the brake oil inlet/outlet 21 are communicated through the passage 28, and the chamber 29 formed on the other side of the piston 726 and the pilot pressure oil inlet/outlet 22 are connected to the passage 3.
Connect with 0.

The piston 26 is provided with sealing means 31 and 32 adapted to the oil quality, and an annular recess 33 is formed to prevent mixing of different oils (brake oil and pilot oil) due to leakage. Measure the discharge.

A brake oil pipe 37 is connected to the brake oil inlet/outlet 21 via the mask cylinder 35 and hydro master 36 shown in FIG.
The nipple 38 is screwed in, and the passage 28 is introduced into the chamber 27.

The plug 24 has a nipple 4 that communicates with the brake cylinder 39 shown in FIG. 1 (one is shown, but there is one between the front and rear wheels).
A check valve means 41 is provided between the nipple 40 and the plug 24 to control the flow to the chamber 27.

In order to release the check valve means 41, a protruding rod piece 42 is provided on the end face of the piston 26, and by moving the piston 26 to the left in the drawing, the ball 43 is shifted to the release position.

A nipple 45 connecting a pilot pressure fluid pipe 44 from the traveling and driving hydraulic circuit 10 via the shuttle valve 15 shown in FIG. 1, shown in FIG.

An adjustment bolt 47 with a sealing means 46 is screwed through the plug 25 and a lock nut 48 is inserted to position it.

Note that 49 indicates an air bleed plug.

In the above, FIG. 2 shows the brake lock valve dynamics (lock position A) when the ball 43 prevents the backflow of high-pressure oil that has entered the brake cylinder 39 and brings the vehicle to a stopped braking state. When the travel 5 drive hydraulic circuit 10 is operated to move the travel 5 drive hydraulic circuit 10, the pilot pressure passes through the passage 30 to the chamber 29, moves the piston 26 to the left, and moves the protruding rod piece 42.
The ball 43 is released and moved to the release position.

As a result, the brake is released, and since the pilot pressure is always applied while the vehicle is running, the ball 43 is always kept in the release position and the brake locking action cannot be exerted.

When pilot pressure is no longer generated due to engine trouble, a brake lock effect is exerted.

At this time, screw in the adjustment bolt 47 and
6 can be mechanically moved to the left and the ball 43 can be moved to the release position and set as the release position, so that the wheel brake 2''lX- can be set to non-braking.

Since the present invention is configured as described above, it is always in the locked position, and can be set in the released position by the left side in the hydraulic drive traveling circuit 10 and by mechanical means.

Therefore, when the vehicle is stopped, the wheel brakes 2 can be maintained in a braking state, and when the vehicle is running, the wheel brakes 2 can be automatically brought into a non-braking state.
Accidents such as burnout of the wheel brake 2 due to erroneous operation or forgetting to operate can be prevented.

Actually, even if the engine is stopped and there is no pressure in the hydraulic drive traveling circuit 10, the wheel brake 2 can be brought into a non-braking state.

Further, the piston 26 provided in the brake lock valve body 20 is pushed toward the one chamber 27 side by the pressure oil of the travel motor 1 flowing into the other chamber 27 and the manual operation member provided with the brake lock valve body 20. Check valve means 4
Press the ball 43 of 1 to connect the chamber 27 and the brake cylinder 39.
Since it is made to communicate with the brake lock valve 16, it is sufficient to provide only one brake lock valve 16, resulting in a simple structure and low cost.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is an overall explanatory view, and FIG. 2 is a sectional view of a main part. 2 is a wheel brake, 10 is a hydraulic drive traveling circuit, 37
is a brake oil pipe, and 41 is a check valve means.

Claims (1)

[Scope of Claim for Utility Model Registration] Pressure oil discharged from the traveling hydraulic pump 11 is transferred to the forward/reverse port 1a of the traveling motor 1 via the directional control valve 12. In a hydraulically driven wheel vehicle in which the supply is controlled to the brake cylinder 3 of the wheel brake 2,
9 through the flake oil pipe 37, and 2 the brake operation 171.
1+8', a brake lock valve 16 is provided in the front brake pipe 3γ connected to the system, and the brake lock valve 16 is connected to the brake lock valve body 20,
A pair of chambers 27 and 29 are formed on both sides of the screw 726 by slidably inserting the stone 26, and the force chamber 27 is connected to the brake 1.
3 is connected to the braking cylinder 39 and to the brake operation hydraulic system through a check valve means 41 that prevents the flow into the chamber 27. Forward/reverse boat 1a, l
b, and a manual operation member is provided on the brake gear r1 pull-up body 20 to push the piston 26 toward one chamber 27, and the piston 26 includes 1) a protruding rod portion facing the pawl 43 marked in 1); A brake lock valve for a hydraulically driven wheel type vehicle, characterized by having a structure with a piece 42 provided therein.