JPS5833327Y2 - hydraulic motor circuit - Google Patents

Description

[Detailed explanation of the invention] This invention combines multiple hydraulic motors into one hydraulic pump or one hydraulic motor.
The present invention relates to a hydraulic circuit for driving with a hydraulic oil source.

For example, in a vehicle that runs on wheels, when two sets of left and right wheels, or drive parts, are driven by two hydraulic motors connected in parallel, the differential motion between the left and right wheels is required during normal steering. This is necessary, but on the other hand, when you really want to go straight, those hydraulic motors need to eliminate the differential operation of each other.

For example, to prevent wheels from slipping in mud or on uneven ground, and to eliminate differential action and make the wheels go straight, one wheel that does not want to move is forcibly driven, and the other wheel that is about to spin is rotated. It is necessary to make it equal to the number.

An example of such a conventional hydraulic circuit is shown in FIG.

In FIG. 1, a hydraulic pump 2 driven by a prime mover 1 drives two hydraulic motors M12M2 connected in parallel, and these hydraulic motors M, , M2 are each driven by a drive device W1. It is designed to drive W2.

A switching valve 3 and a flow dividing device 4 are connected to the line A in parallel.

In the illustrated position of the switching valve 3, pressure oil is supplied to the motor M12M2 through the flow dividing device 4 without differential operation, and when the switching valve 3 is switched, pressure oil in line A is directly applied to each motor. , a differential action occurs.

However, such a known circuit has disadvantages in that it requires a complicated and expensive flow dividing device in addition to the switching valve, requires a large number of piping, and cannot be arbitrarily adjusted for differential operation.

Therefore, an object of the present invention is to provide a hydraulic circuit that can easily and inexpensively supply a required amount of pressure oil to a plurality of hydraulic motors according to load conditions.

Hereinafter, an embodiment of the present invention will be described with reference to FIG.

In the embodiment shown in FIG. 2, the main pump P1 driven by the prime mover 1 is a variable displacement reversible pump, and either line A or line B is a line for supplying pressure oil, and the other is a return line. It becomes.

These lines A and B are equipped with hydraulic motors M and M
2 are provided in parallel, respectively driving devices W1 and W2.
It is designed to drive.

The illustrated embodiment shows a clost circuit, so that lines A and B are connected via a known safety valve R1, and an auxiliary pump P2 transfers oil from tank T to line A or B via a check valve C1 or It is designed to be supplied via C2.

In the figure, R2 is a safety valve.

Now, according to the present invention, on either the supply line or the return line leading to each hydraulic motor, that is, lines C and D in the illustrated embodiment, a valve device (1) and (2) is provided.
2 are interposed respectively.

These crest valve devices■1. ■2 is an arbitrary opening position (from fully open position to almost fully open position) as described below.
It is possible to control the aperture (aperture degree).

Therefore, hydraulic motor M1. When it is necessary to limit mutual differential operation caused by uneven load or pressure on M2, use these valve devices ■3. (2) By appropriately controlling 2, the load pressure can be controlled, and the differential operation can be restricted as necessary.

That is, if the valve device of one of the motor circuits that attempts to idle is activated, the differential operation of the pressure oil is restricted to the other motor circuit that has not attempted to run.

FIGS. 3 and 4 show embodiments of the crest valve devices (1) and (2) shown in FIG. 2.

As shown in FIG. 4, in the illustrated embodiment, two valve devices V, , V2 are housed in one casing 10, and these valve devices 1. Since the valve devices (1) and (2) are symmetrically arranged in substantially the same way, one valve device (1) will be explained with reference to FIG.

In FIG. 3, a casing 10 houses a spool 11, which has lands 12 and 13 and is adapted to represent boats B, B, B2.

A rod 14 extending from this spool 11 is connected to a connecting device 15.
By moving the lever 16 from the position shown in solid lines (I) to the position shown in phantom lines (II), the spool 11 can be moved in the axial direction.

Position (1) is a fully open position, and position (II) is a crest position (a fully closed position).

At a position intermediate between these positions (1) and (n), liquid is formed between the tapered surface 12a of the land 12 and the shoulder 10a of the casing.

The spool 11 is normally pressed to position (1) by a spring 17 provided on the opposite side of the rod 14.

The liquid flowing through lines C and D flows from boat B to B2 or vice versa, and from boat A1 to A2 or vice versa, respectively, by operating the lever 16 in the valve device 3. (2) The flow path resistance when flowing through 2 can be controlled.

The relationship between the amount of operation of the lever 16 and the flow path resistance is shown in FIG.

During operation, under normal conditions, the valve device ■1. The lever 16 of ■2 is in position (1), and the valve device ■1. ■2 ha has not had any effect since the beginning.

However, for example, when the load on one drive device W1 is relatively large and the load on the other drive device W2 is small, the pressure oil from the pump P1 flows to the motor M2 with a smaller load, and the drive device W2 is prevented from being overloaded. You will start idling.

The rotation of the motor M1, which has a large load, is then reduced or stopped.

At this time, the flow path resistance of line D is increased by controlling the valve device (2) to balance the flow path resistance of lines C and D.

If this is done, motors M, . . . M2 will operate in the same manner.

Another advantage is that if you want to change the direction of travel of the vehicle over a shorter distance than usual, for example, you can actively slow down the rotation of one motor M1 to a much slower rate than the rotation of the other motor M2. In this case, the flow resistance can be further increased by controlling the valve device (1).

As described above, according to the present invention, since the stop valve device is individually provided in the supply line or return line leading to each motor, the operation of each motor can be controlled very suitably.

In particular, according to the prior art, the method of providing a switching valve and a flow divider in a main line such as a supply line or a return line requires complicated changes in the flow ratio of the flow divider valve, and when the number of motors exceeds two, Although the number of units is two or more, in this invention, flow path resistance can be applied individually and arbitrarily by simply providing a stop valve in the main line of a hydraulic circuit having multiple motors. It can be assembled easily and inexpensively.

Furthermore, a communication hole E is opened in the B2 chamber of the casing 10 in FIG. 3 in a direction perpendicular to the spool 11, and the boat B in FIG.
2 and A2, lines C and D in Figure 2 become E.
The actual piping is A in Figure 4.
2 or B2 can be used for both purposes.

[Brief explanation of the drawing]

Figure 1 is a diagram of a conventional hydraulic circuit that drives multiple hydraulic motors with one pump, Figure 2 is a diagram of a hydraulic circuit according to the present invention, and Figure 3 is a diagram of a hydraulic circuit implemented in the present invention. Cross-sectional view of the crest valve device,
FIG. 4 is a plan view of the pull valve device, and FIG. 5 is a characteristic curve of the pull valve device. 1... Prime mover, P... Main pump, M
12M2...Hydraulic motor, A, B, C, D...Line, Va. ■2・・・・・・Crest valve device.

Claims (1)

[Scope of utility model registration request] In a hydraulic motor circuit in which a plurality of hydraulic motors connected in parallel are driven by one hydraulic pump or one set of hydraulic pressure sources, each hydraulic motor is connected to the supply line or return line leading to each hydraulic motor. A throttle valve device is provided for each hydraulic motor, and the throttle valve device is individually controlled to an arbitrary opening degree by input, giving an arbitrary flow path resistance to each hydraulic motor, and controlling each fluid according to the load. A hydraulic motor circuit characterized in that it is capable of supplying a required amount of hydraulic fluid to a hydraulic motor.