JPH10259801A - Hydraulic operation transmission device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the rise and fall of the action of a hydraulic actuator from being steel by interposing a throttle part and a flow passage regulating part which are continuously connected to each other close to a hydraulic control valve in a pilot oil passage. SOLUTION: Even when a remotely-controlled valve 28 is rapidly opened, the action of a pilot valve of the oil flowing into a hydraulic control valve V becomes slow by a throttle part C and a flow passage regulation part D in the vicinity of the remotely-controlled valve 28, the rapid action start of a hydraulic motor M for turning is suppressed, and a body frame starts the turning smoothly. When the remotely-controlled valve 28 is rapidly closed, the pilot pressure and the flow speed flowing out of the hydraulic control valve V are dropped by the throttle part C and the flow passage regulation part D in the vicinity of the hydraulic control valve V, the closing action of a spool of the hydraulic control valve V becomes slow, the rapid action stop of the hydraulic motor M for turning is suppressed, and the body frame smoothly stops its turning. The shock can be reduced thereby.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a hydraulic operation transmission device.

[0002]

2. Description of the Related Art Conventionally, there has been developed a hydraulic operation transmission device in which an operation force is reduced by opening and closing a remote control valve connected to a hydraulic pump to generate a pilot pressure and opening and closing a hydraulic control valve by the pilot pressure. is there.

[0003]

However, since the pilot pressure rises steeply, the rise of the hydraulic pressure and the flow rate due to the opening / closing operation of the hydraulic control valve also rises steeply. Will suddenly start or stop the operation, for example, when the hydraulic operation transmission device is applied to a hydraulic control valve that controls the turning of the power excavator, the aircraft suddenly starts or stops turning, There is a problem that a shock is generated each time.

Therefore, it is conceivable to interpose a throttle between the remote control valve and the hydraulic control valve to make the rise of the pilot pressure gentle. However, in this case, the operation of the remote control valve and the operation of the hydraulic actuator are performed. (In the example above,
Between the start and stop of the turn).
At low temperatures, the time lag increases, making it impossible for the hydraulic actuator to perform agile operation, resulting in reduced work efficiency, and furthermore, a feeling of incompatibility between operation and operation of the actuator occurs, thereby increasing operator fatigue. Problems arise.

[0005]

Therefore, in the present invention, a remote control valve is connected to a pilot pressure inflow portion and an outflow portion of a hydraulic control valve through a pilot oil passage, and hydraulic control is performed by a pilot pressure from the remote control valve. A hydraulic operation transmission device configured to control the operation of a hydraulic actuator connected to the hydraulic control valve by moving a spool of the valve. It is another object of the present invention to provide a hydraulic operation transmission device in which a throttle section and a flow path regulating section are provided.

[0006] Further, the throttle portion is provided with an orifice for imparting resistance to the flow of pressure oil, and the flow path regulating portion is provided with a check valve which allows the flow of pressure oil only in one direction. Having.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, a throttle section and a flow path restricting section are interposed in a reciprocating oil passage between a remote control valve and a hydraulic control valve, respectively, so that the rise and fall of pilot pressure are moderated. By gradually opening and closing the hydraulic control valve, the rise and fall of the operation of the hydraulic actuator are prevented from becoming steep.

[0008]

Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a power excavator B provided with a hydraulic operation transmission device A according to the present invention. The power excavator B includes a traveling frame 2 having a pair of left and right crawler traveling devices 1. A turning frame 3 is disposed on the turning table 3, an airframe 4 is mounted on the upper surface of the turning table 3 so as to freely turn left and right, and a turning hydraulic motor M interlocked with the turning table 3 is disposed on the airframe 4. The body frame 4 is turned left and right by forward and reverse rotation of the motor M.

A bracket 5 protrudes from the front end of the body frame 4 and a base 7 serving as a base end of a working unit 6 is attached to the bracket 5 so as to swing right and left, and a boom 8 and an arm are mounted on the base 7. The boom hydraulic cylinder 1 is provided between the boom 8, the arm 9 and the bucket 10.
1, arm hydraulic cylinder 12 and bucket hydraulic cylinder 13
The excavating operation is performed by vertically moving the boom 8, the arm 9, and the bucket 10 by the expansion and contraction operation of the hydraulic cylinders 11, 12, and 13.

Further, on the upper surface of the body frame 4, an operating portion 14 is provided at a front portion, and a motor portion 15 is provided at a rear portion. The operating portion 14 has various operation levers 16 provided at a front portion of the upper surface of the body frame 4. An operation stand 17 is erected, a seat 18 is placed at a predetermined distance behind the operation stand 17, an operation column 19 is erected on the left front of the seat 18, and an upper end of the operation column 19 is provided. A turning operation lever 20 is provided upright so as to be able to tilt back and forth and left and right.

As shown in FIG. 2, a hydraulic pump P interlockingly connected to an engine E is provided in the motor unit 15.
The discharge port 21 of the hydraulic pump P is connected to a hydraulic control valve V, and the hydraulic control valve V is connected to the turning hydraulic motor M via oil passages 22 and 23. Via a hydraulic operation transmission device A, it is communicatively connected to a remote control valve 28 interlocked with the turning operation lever 20.

The hydraulic control valve V is, as shown in FIG.
The valve body 24 is configured as a pilot operated type having oil chambers 26 and 27 at positions facing both ends of the spool 25, and the oil chambers 26 and 27 are connected to the remote control valve 28 so as to flow therefrom. Spool 25 by pilot pressure oil
When the pilot pressure in each of the oil chambers 26, 27 disappears, the return spring 29 returns the spool 25 to the neutral position.

The remote control valve 28 is disposed above the operation column 19 and has a discharge port of the hydraulic pump P.
The operation column 19 is interposed between the hydraulic control valve V and the hydraulic control valve V.
By opening or closing the valve in conjunction with the operation of the swing operation lever 20 erected in the vertical direction and controlling the pilot pressure to the hydraulic control valve V, the supply destination of the hydraulic oil from the hydraulic control valve V is reversed. Alternatively, the feeding is stopped, and the turning hydraulic motor M is rotated forward and backward and stopped.

In the hydraulic operation transmission device A, according to the present invention, in the pilot oil passages 30, 31 from the remote control valve 28 to the hydraulic control valve V, the hydraulic control transmission device A Restrictor C and flow restrictor D connected in parallel
To regulate the pressure and flow rate of the pilot oil flowing into and out of the hydraulic control valve V,
Even if the valve 28 is opened and closed suddenly, the opening and closing operation of the spool 25 of the hydraulic control valve V is made slow to suppress the sudden start of operation when the turning hydraulic motor M starts and stops, and the start and stop operation of the turning of the body frame 4 is suppressed. I try to make it smooth.

As shown in FIG. 4, the restricting portion C and the flow path restricting section D are provided at a central portion of the flow path restricting section main body 41 with a valve seat 42 having a substantially conical concave surface expanding leftward. The left and right communication holes 43 and 44 are formed on the left and right sides of the valve seat 42, respectively, and a valve body 46 urged rightward by a spring 45 is brought into contact with the valve seat 42 so as to be able to come and go, The left end of the spring 45 is supported by a tubular body 47 screwed from the left side to the flow path regulating section main body 41 to form the flow path regulating section D, and the left communication hole 43 and the right communication hole 44 are formed.
An orifice 48 as a throttle portion C is bored between the inner peripheral surface. Therefore, in FIG. 4, when the pilot pressure acts from the left side of the flow path regulating portion D, the valve body 46
The pilot pressure and flow velocity of the pressure oil flowing to the right decrease due to the resistance of the orifice 48. Conversely, when the pilot pressure acts from the right of the flow path regulating portion D, the valve seat 42 is closed. Is released and the pressure oil flows without resistance. In the figure, 49 is a cap nut, 50 is a pipe, and 51 is a tapered screw.

With the above configuration, even if the remote control valve 28 is suddenly opened, the pilot pressure and the flow velocity flowing into the hydraulic control valve V are reduced by the throttle portion C and the flow path regulating portion D near the remote control valve 28. As a result, the opening operation of the spool 25 of the hydraulic control valve V becomes gentle, the sudden start of operation of the turning hydraulic motor M is suppressed, and the body frame 4 starts turning smoothly.

When the remote control valve 28 is suddenly closed, the pilot pressure and the flow velocity flowing out of the hydraulic control valve V decrease due to the throttle portion C and the flow path regulating portion D near the hydraulic control valve V. As a result, the closing operation of the spool 25 of the hydraulic control valve V becomes gentle, and the sudden stop of the operation of the turning hydraulic motor M is suppressed, so that the body frame 4 stops turning smoothly.

As described above, since the starting and stopping operations of the turning hydraulic motor M become gentle, the starting and stopping operations of the turning of the body frame 4 become smooth, so that the impact at this time can be reduced.

Further, even if the operator's hand becomes unstable due to the vibration of the body, the pilot pressure and the flow rate of the pressure oil from the remote control valve are stable, so that the jerk of the turning operation is prevented, and The frame 4 can perform a smooth turning operation. Furthermore, the pilot pressure and the flow rate of the pressure oil are controlled by two throttle portions connected in series.
C, C (in the vicinity of the remote control valve 28 and in the vicinity of the hydraulic control valve V), the inner diameters of the orifices 48, 48 can be respectively increased, suppressing an increase in flow path resistance at low temperatures, Operation of swing operation lever 20 and body frame 4
It is possible to prevent a time lag from the turning operation of the vehicle.

Further, by making the resistance between the throttle portion C near the remote control valve 28 and the throttle portion C near the hydraulic control valve V different, the resistance when the pilot pressure oil flows into the hydraulic control valve V and the pressure oil Airframe 4
The hydraulic control valve V
As described above, the operation control of the hydraulic motor for turning the fuselage frame 4 in the power excavator B has been described as an example.
The present invention is not limited to the above embodiment, and can be widely applied to operation control of a hydraulic actuator controlled by a hydraulic control valve that opens and closes with a pilot pressure.

[0022]

According to the present invention, the following effects can be obtained.

According to the first aspect of the present invention, the remote control valve is connected to the pilot pressure inflow portion and the outflow portion of the hydraulic control valve via the pilot oil passage, and the spool of the hydraulic control valve is controlled by the pilot pressure from the remote control valve. In the hydraulic operation transmission device configured to control the operation of the hydraulic actuator connected to the hydraulic control valve by moving the hydraulic control valve, the pilot oil passage includes a throttle unit connected in parallel close to the hydraulic control valve. By interposing the flow path regulating portion, even if the remote control valve is rapidly opened, the opening operation of the spool of the hydraulic control valve becomes slow, and the acceleration at the start of the operation of the hydraulic actuator becomes small. The impact at the time can be reduced.

Further, even if the operator's hand becomes unstable due to vibration of the machine body, etc., the pilot pressure and the flow velocity of the pressure oil from the remote control valve are stable, so that the hydraulic actuator is jerked (jerky operation). Is prevented, and the hydraulic actuator can perform a smooth operation.

Further, the pilot pressure and the flow rate of the pressure oil are controlled by the two throttles connected in series.
Since the flow path cross-sectional area of the orifice can be increased, the time lag between the operation of the operation lever or the like at a low temperature and the operation of the hydraulic actuator can be reduced.

According to the second aspect of the present invention, the throttle section is
When the pilot pressure oil flows into the hydraulic control valve, it has an orifice that gives resistance to the flow of the pressure oil, and the flow path regulating section has a check valve that allows the flow of the pressure oil only in one direction. The resistance and the resistance at the time of pressure oil outflow can be made different, and the hydraulic control valve can perform optimal valve opening and valve closing operations for smooth start and stop of operation of the hydraulic actuator, respectively.

[Brief description of the drawings]

FIG. 1 is a side view of a power excavator equipped with a hydraulic operation transmission device according to the present invention.

FIG. 2 is a hydraulic circuit diagram showing a configuration of a hydraulic operation transmission device.

FIG. 3 is an explanatory sectional view of a hydraulic control valve.

FIG. 4 is an explanatory cross-sectional view of a diaphragm.

[Explanation of symbols]

 A Hydraulic operation transmission device C Throttle section D Flow control section M Hydraulic actuator P Hydraulic pump V Hydraulic control valve V1 Pilot pressure inlet V2 Pilot pressure outlet 25 Spool 28 Remote control valve 30 Pilot oil passage 31 Pilot oil passage 40 Non-return Valve 48 orifice

Claims (2)

[Claims] A remote control valve (28) is connected to a pilot oil passage (30) (3).
1) through the pilot pressure inflow section (V1) and the outflow section (V2) of the hydraulic control valve (V), and the hydraulic control valve (V) spool ( 25), and the hydraulic actuator connected to the hydraulic control valve (V)
In the hydraulic operation transmission device configured to control the operation of (M), a hydraulic control valve is provided in each of the pilot oil passages (30) and (31).
The throttle (C) and the flow restrictor connected in parallel close to (V)
(D) and a hydraulic operation transmission device interposed therebetween. 2. The throttle section (C) includes an orifice (48) for imparting resistance to the flow of pressure oil, and the flow path regulating section (D) includes an orifice for permitting the flow of pressure oil in only one direction. The hydraulic operation transmission device according to claim 1 or 2, further comprising a stop valve (40).