JPS6263247A - Hydraulic-operated interlocking device - Google Patents

Abstract

PURPOSE:To accomplish accurate operation of a piston by providing a drain oil chamber of a cylinder as a drain oil circuit, thereby to drain oil, and elastically moving a piston to an oil chamber by a spring disposed in the drail oil chamber. CONSTITUTION:A side clutch of a travel gear of a combine or the like is connected to a piston 3, and the piston 3 is accommodated in a cylinder 2. The cylinder 2 has an oil pressure chamber 4 and a drain oil chamber 7, and both chambers 4, 7 are connected to a hydraulic circuit 6 and a drain oil circuit 11. A spring 12 is disposed in a drain oil chamber 7, thereby to move the piston 3 to the oil pressure chamber 4 side. The hydraulic circuit 6 and the drain oil circuit 11 connected to each oil pressure chamber 4 are provided with selector valves 24 for selectively operating right and left side clutches. The drain oil circuit 11 is always connected to the drain oil circuit 11 by a circuit 30, and further connected to the oil pressure chamber 4 by a circuit 31 at a position where the piston 3 is operated less than designated.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention This invention relates to a hydraulic operation interlocking device for interlocking the operation of operating parts using hydraulic pressure. For example, it can be used as an interlocking device for the operation of a power transmission clutch, or an interlocking device between a sensor and an actuator that is interlocked by the sensor.

Conventional technology Hydraulic pressure is sent from a hydraulic pump to a hydraulic cylinder via a switching valve to cause the piston of this hydraulic cylinder to slide, and the hydraulic pressure in this hydraulic cylinder is drained to a tank port to push the piston back. In this type of hydraulic circuit, an oil filter for filtering the waste oil, an oil cooler for cooling the waste oil, etc. are provided in the oil drain circuit from the hydraulic cylinder to the tank port.

Problems to be Solved by the Invention In this type of hydraulic circuit, back pressure acts on the oil drain circuit due to the resistance of the oil filter, oil cooler, etc., and this back pressure affects the inside of the hydraulic cylinder. This may cause the piston to operate in the opposite direction. That is, when draining oil, the piston must be returned in the opposite direction to when hydraulic pressure is applied, but the back pressure during oil draining causes the piston to move in the same direction as when hydraulic pressure is applied. Therefore, in the case of a transmission clutch, the clutch that was once disengaged may be re-engaged, which can be dangerous.

Means for Solving the Problems This invention provides hydraulic pressure from a hydraulic pump (1) to a cylinder (
2) and a piston (3) that fits into this cylinder (2), and the actuating part (5) is actuated by the relative movement of these cylinders (2) and pistons (3). In the hydraulic circuit (6) to be operated, there is an oil drain chamber (
7) and through an oil drain resistance part such as an oil filter (8) or an oil cooler (9).
) is provided, and the oil drain chamber (7) is provided with a spring +12) which urges the piston (3) toward the hydraulic chamber (4) with an appropriate pressure. It is configured as an operation interlocking device.

Operation of the Invention Hydraulic pressure is sent to the hydraulic chamber (4) of the cylinder (2) by driving the hydraulic pump fil, and the relative position between the cylinder (2) and the piston (3) is moved to move the operating part (
5) is activated. At this time, some oil is also sent to the oil drain chamber (7) of this cylinder (2), so it is pushed out by the operation of this piston (3) and drained into the oil drain circuit (11). Along the way, the oil passes through an oil filter (8) or an oil cooler (9) and is drained to a tank port (101).

To release the operating state of the operating part (5), the hydraulic circuit (
Even if the sending of hydraulic pressure to the hydraulic chamber (4) is stopped by switching the switching valve in step 6), in the neutral position of switching, a hydraulic pressure larger than the discharge hydraulic pressure may act on the hydraulic chamber (4). Since this is pushed toward the hydraulic chamber (4) by the spring (IZ) in the oil drain chamber (7), the actuating part will not operate unexpectedly even if the hydraulic pressure in the hydraulic chamber (4) increases slightly when the hydraulic pressure is neutral. Also, in the oil drain circuit (11), the oil filter (8)
Even if back pressure is generated in the oil drain resistance section such as the oil cooler (9), this back pressure acts on the oil drain chamber (7), so the operating section (5) must be kept in the non-operating state, that is, in the neutral position. This prevents the piston (3) that is currently in operation from being forced into the operating side.

Effects of the invention In this way, the hydraulic pressure from the hydraulic pump (1) is transferred to the hydraulic chamber (4).
to operate the piston (3), or when discharging the hydraulic pressure in the hydraulic chamber (4) to restore the piston (3) to the non-operating position, the The oil drain chamber (7) is used as an oil drain circuit (11) to drain oil, and this oil drain chamber (7) is equipped with a spring (with appropriate pressure) that springs the piston (3) toward the hydraulic chamber (4). Therefore, when this histone (3) is in the non-operating position, even if back pressure acts on the oil drain circuit (6), it acts on the oil drain chamber (7) and flows toward the hydraulic chamber (4). The piston (3) does not work much and allows the piston (3) to operate accurately.

Embodiment In the illustrated example, the actuating part (5) is for turning on and off the side clutch of a traveling device such as a combine harvester, and is provided in a transmission case (14) in which a traveling transmission mechanism is housed. The side clutches (14) are provided as a pair on the left and right, and are configured to transmit power to the left and right traveling devices, respectively.A gear FIB is provided in the center of one of the side clutches (14), which is transmitted and rotated from the input shaft side. Side clutches on both left and right sides (
1■ is rotatably shaft-mounted, and the inner end of each side clutch (13+ gear (lη) is connected to the inner end of the gear (161
8 parts can be engaged with each other, and this engagement creates a side clutch (131 state).Each gear (1 force) is transmitted through a gear to transmit the transmission mechanism of the traveling device on each corresponding side. On the outside of each side clutch (l),
A multi-disc handbrake (+91) is provided, and when the side clutch (131) is moved further outward, the side brake (1g+) is activated, and the corresponding side traveling gear is activated. This is to prevent the following.

Each side clutch (131) is provided with a clutch shifter (2I), and the piston (3) can be rotated under pressure via a rod 1211 (2) corresponding to each clutch shifter rod.

A cylinder case (23) is provided on the upper part of the transmission case (14), and a cylinder (2) having the piston (3) is provided.This cylinder (2) is connected to a hydraulic circuit (6) and an oil drainage circuit (11). By communicating with the piston (31), the side clutch (l□□□) is set in a relationship in which it can be disconnected. The upper side is the hydraulic chamber (4), and the lower side is the oil drain chamber (7).A spring (1) is installed in this oil drain chamber (7), and the piston (3) is connected to the hydraulic chamber. (4) side.The hydraulic circuit (6) and the oil drain circuit (11) communicating with each hydraulic chamber (4) are provided with a switching valve I2Φ, and the left and right side clutches (1 Neutral position (S9) to bring it into the state, and either left or right side clutch (left hand position QQ, right hand position (27) where it can be turned off completely).
The configuration allows switching between the two modes.

R2 (2) is the solenoid that operates this switching valve (241).

The oil drain circuit (II) is also in continuous communication with the oil drain chamber (7) through circuit 0D, and furthermore, at a position where the piston (3) in this cylinder (2) is operated below a certain level, the oil drain chamber (7) is in constant communication with the oil drain chamber (7). (4)
The piston (3) is connected to the piston (3) through a circuit 0υ to prevent the piston (3) from being depressed below a certain level. t321 is the circuit C3
This is a pressure regulating valve provided at 11.

The hydraulic circuit (6) is provided with an operating valve (to) for a lifting cylinder 03 that can lift and lower the reaping device of the combine.

09 is a relief valve.

As shown in Fig. 3, the switching valve Q4 has a configuration in which a hydraulic circuit (6) is connected to the center of the valve chamber OQ through a communication port (B), and an oil drain circuit (111 is connected to a communication port at both left and right ends). In a configuration in which the communication ports (B) and (To) are provided with communication ports (G) that communicate with the corresponding left and right cylinders (2), the valve stem (A) communicates with the valve stem (A). When the central gate valve and the left and right gate valves Ωno are in the neutral position as shown in the figure, hydraulic pressure from the communication port (b) flows to the cylinder (2). communication port (5) and the oil drain circuit (I
It is in communication with the communication port (to) of ll/\, and in this communication state, the communication port (to) has a narrower gap 03 than (to), so the hydraulic chamber is in the neutral position. The oil pressure acting on (4) rises higher than the oil pressure acting on the oil drain chamber (7), but since the spring (121) is working on this oil drain chamber (7), the piston (3) is actuated. Never.

The oil filter (8) and oil cooler (9) are arranged in the oil drainage circuit (11).

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; FIG. 1 is a partial cross-sectional view, FIG. 2 is a hydraulic circuit diagram, and FIG. 3 is an enlarged cross-sectional view of a partial embodiment. In the figure, +11 is a hydraulic pump, (2) is a cylinder, (
3) is a piston, (4) is a hydraulic chamber, (5) is an operating part, (
6) is a hydraulic circuit, (7) is an oil drain chamber, (8) is an oil filter, (9) is an oil tank, Q (It is a tank port,
(11) indicates an oil drain circuit, and (I21 indicates a spring).

Claims (1)

[Claims] The hydraulic pressure from the hydraulic pump (1) is sent to the hydraulic chamber (4) between the cylinder (2) and the piston (3) that fits into this cylinder (2), and the cylinder (2) and the piston (3) are connected to each other.
) of the piston (3) of the cylinder (2), which actuates the actuating part (5) by its relative movement with the piston (3) of the cylinder (2).
Drained oil that communicates with an oil drain chamber (7) formed between the rear surface and the tank port (10) through an oil drain resistance part such as an oil filter (8) or an oil cooler (9). A hydraulic operation interlocking device is provided with a circuit (11) and a spring (12) in the oil drain chamber (7) that biases the piston (3) toward the hydraulic chamber (4) with an appropriate pressure.