WO1995026277A1 - Dispositif hydraulique de transfert - Google Patents
Dispositif hydraulique de transfert Download PDFInfo
- Publication number
- WO1995026277A1 WO1995026277A1 PCT/JP1995/000600 JP9500600W WO9526277A1 WO 1995026277 A1 WO1995026277 A1 WO 1995026277A1 JP 9500600 W JP9500600 W JP 9500600W WO 9526277 A1 WO9526277 A1 WO 9526277A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- port
- spool
- valve
- pressure
- ports
- Prior art date
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K17/00—Arrangement or mounting of transmissions in vehicles
- B60K17/04—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing
- B60K17/10—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing of fluid gearing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D11/00—Steering non-deflectable wheels; Steering endless tracks or the like
- B62D11/02—Steering non-deflectable wheels; Steering endless tracks or the like by differentially driving ground-engaging elements on opposite vehicle sides
- B62D11/06—Steering non-deflectable wheels; Steering endless tracks or the like by differentially driving ground-engaging elements on opposite vehicle sides by means of a single main power source
- B62D11/10—Steering non-deflectable wheels; Steering endless tracks or the like by differentially driving ground-engaging elements on opposite vehicle sides by means of a single main power source using gearings with differential power outputs on opposite sides, e.g. twin-differential or epicyclic gears
- B62D11/14—Steering non-deflectable wheels; Steering endless tracks or the like by differentially driving ground-engaging elements on opposite vehicle sides by means of a single main power source using gearings with differential power outputs on opposite sides, e.g. twin-differential or epicyclic gears differential power outputs being effected by additional power supply to one side, e.g. power originating from secondary power source
- B62D11/18—Steering non-deflectable wheels; Steering endless tracks or the like by differentially driving ground-engaging elements on opposite vehicle sides by means of a single main power source using gearings with differential power outputs on opposite sides, e.g. twin-differential or epicyclic gears differential power outputs being effected by additional power supply to one side, e.g. power originating from secondary power source the additional power supply being supplied hydraulically
- B62D11/183—Control systems therefor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/25—Pressure control functions
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/305—Directional control characterised by the type of valves
- F15B2211/30525—Directional control valves, e.g. 4/3-directional control valve
- F15B2211/3053—In combination with a pressure compensating valve
- F15B2211/30535—In combination with a pressure compensating valve the pressure compensating valve is arranged between pressure source and directional control valve
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/315—Directional control characterised by the connections of the valve or valves in the circuit
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/50—Pressure control
- F15B2211/515—Pressure control characterised by the connections of the pressure control means in the circuit
- F15B2211/5151—Pressure control characterised by the connections of the pressure control means in the circuit being connected to a pressure source and a directional control valve
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
- F15B2211/71—Multiple output members, e.g. multiple hydraulic motors or cylinders
Definitions
- the present invention relates to a traveling hydraulic device for supplying hydraulic pressure discharged from one hydraulic pump to a left-right traveling hydraulic motor in a tracked work vehicle such as a power shovel.
- a vehicle body is provided on a traveling body so as to be able to turn with a turning hydraulic motor, and a boom, an arm, and a baguette are mounted on the vehicle body using a boom cylinder, an arm cylinder, and a knock-out cylinder, respectively.
- the traveling body is provided so as to be able to swing up and down, and the traveling body is of a tracked type in which left and right crawler belts are driven by left and right traveling hydraulic motors.
- FIG. 1 This is achieved by providing a left / right switching valve 56 for supplying hydraulic oil to the left and right traveling hydraulic motors 3 and 4 in the discharge path 2 of the variable displacement hydraulic pump 1 and loading the left and right switching valves 5 and 6 at the inlet side.
- a pressure compensating valve 9 composed of a check valve 7 and a pressure reducing valve 8 that pushes the load check valve 7 in the closing direction by a downstream pressure against the load pressure is provided, and a left-right switching valve 5 is provided.
- 6 are connected to the pressure receiving part of the pressure reducing valve 8 of each pressure compensating valve 9, and the downstream pressure of the pressure reducing valve 8 is passed through the load pressure introducing passage 10 to the capacity control valve.
- each pressure compensating valve 9 controls the main differential pressure of the left and right directional switching valves 5 and 6. That. 13 is a counterbalance valve provided between the left and right direction switching valves 5 and 6 and the left and right traveling hydraulic motors, respectively.
- the left and right directional control valves 5 and 6 have different mating opening areas so that the left and right traveling hydraulic motors 3 and 4 have different rotation speeds, so that the left and right traveling is performed. At that time, the running speed decreases.
- the pressure difference between the inner traveling motor and the outer traveling motor increases.
- the flow of pressure oil to the inner traveling motor results in energy loss, and the horsepower control is normally activated, the capacity of the variable displacement hydraulic pump 1 is reduced, and the flow to the outer traveling motor is reduced.
- Speed decreases.
- the right and left directional control valves 5 and 6 are set to the right position A, and the left and right directional control valves 5 have a large opening area and the right directional control valve 6 has a very small metering opening area.
- the driving pressure PL 2 is the set pressure of the counterbalance valve 13
- the driving pressure PL 1 of the left traveling hydraulic motor 3 is a high pressure corresponding to the traveling resistance and the turning resistance. Accordingly, since the pressure reducing valve 8 of the pressure compensating valve 9 on the outside of the turning circle (left side) is pushed rightward by the load pressure PL1, the opening degree of the load check valve 7 becomes large, and the inside of the turning circle on the right side (right side).
- the pressure reducing valve 8 of the pressure compensating valve 9 is pushed to the left by the load pressure PL 1 on the outer side (left side) of the turning circle, and pushes the load check valve 7 to the closing side, thereby reducing the opening of the load check valve 7. I do.
- This opening is inversely proportional to the differential pressure PL 1 — PL 2 of the driving pressure.
- the traveling hydraulic circuit includes a variable displacement hydraulic pump 1 and a left / right switching valve 5 for supplying the discharge pressure oil of the variable displacement hydraulic pump 1 to the left / right traveling hydraulic motors 3, 4. , 6 and a displacement control valve 11 and a displacement control cylinder for controlling the displacement of the variable displacement hydraulic pump 1 so that the differential pressure between the load pressure of the left and right traveling hydraulic motors 3 and 4 and the pump discharge pressure becomes constant.
- the switching valve 23 is held at a drain position B by a panel force, and can be switched between a left position C and a right position D by pressure oil supplied to the left and right pressure receiving portions 30 and 31. That is, the left and right pressure receiving sections 30 and 31 are
- 3 2 and 3 3 are connected to the load pressure detection ports 5 a and 6 a of the left and right direction switching valves 5 and 6, respectively, so that the switching valve 23 differs from the load pressure of the left and right traveling hydraulic motors 3 and 4.
- the right and left positions C and D can be switched when the error occurs.
- the left and right direction switching valves 5 and 6 are set to the right position A, the left direction switching valve 5 has a large mating opening area, and the right direction switching valve 6 has a large mating opening area. If the opening area is small, the left traveling hydraulic motor 3 is on the outside of the turning circle, and the right traveling hydraulic motor 4 is on the inside of the turning circle, the right traveling hydraulic The motor 4 is in a braking state, the driving pressure PL 2 is the set pressure of the counterbalance valve 13, and the driving pressure PL 1 of the left traveling hydraulic motor 3 is a high pressure corresponding to the traveling resistance and the turning resistance. Therefore, the inlet pressure P1 of the leftward switching valve 5 becomes higher than the inlet pressure P2 of the rightward switching valve 6. That is, the load pressure of the left traveling hydraulic motor 3 becomes higher than the load pressure of the right traveling hydraulic motor 4.
- the switching valve 23 is brought to the left position C by the load pressure acting on the left pressure receiving portion 30, and the return circuit 21 of the left directional switching valve 5 is connected to the inlet of the auxiliary relief valve 24. And the return circuit 22 of the right directional valve 6 is connected to the tank 25.
- the inlet side of the auxiliary relief valve 24 rises to the set pressure P3 to compensate for the back pressure of the return circuit 21 and the pressure oil flows to the right of the circuit 26 and the check valve 27. It flows into the upstream circuit 29 of the directional control valve 6.
- the load check valve 7 inside the turning circle is pushed to the closing side, so that the flow rate of the hydraulic oil flowing from the variable displacement hydraulic pump 1 to the right-hand hydraulic motor 4 via the load check valve is reduced. I do.
- the present invention has been made in order to improve such a problem, and a pipe for supplying return oil from the left-right switching valve to the switching valve is not provided. It is an object of the present invention to provide a traveling hydraulic device which is essential. Disclosure of the invention
- left and right direction switching valves for supplying hydraulic oil to left and right traveling hydraulic motors
- the left valve is formed by forming a spool hole having a pump port, an actuating port, and a return port in the first valve body, and inserting a spool for communicating and blocking each port into the spool hole.
- a spool hole having a pump port, an actuator port, and a return port is formed in the second valve body, and a spool for communicating / blocking each port is inserted into the spool hole to insert the right-side switching valve.
- a spool hole having an inflow port and a tank port is formed in the third valve body, and a spool for communicating and blocking each port is inserted into the spool hole, and pressure receiving chambers are provided at both ends of the spool.
- the first and second valve bodies are respectively connected to the third valve body to communicate the return ports and the inflow ports.
- motor A traveling hydraulic device is provided, in which negative pressure is introduced.
- a spool hole is formed in the valve body to open the pump port, the first and second actuator ports, and the first and second return ports, and the spool is inserted into the spool hole, and the spool is slid. And a first position for connecting the pump port to the first actuator port and for connecting the second actuator overnight port to the second return port.
- the left and right direction switching valves so as to switch the pump port to a second position communicating with the second actuator port and to switch the first actuator overnight port to a second position communicating with the first return port.
- a spool hole is formed in the other valve body so that the passage, the first and second inflow ports, and the first and second tank ports are opened, and a spool that communicates and blocks each port is fitted into the spool hole.
- the spool is held at a neutral position by a spring, and first and second pressure receiving chambers are provided at both ends of the spool, respectively, and the spool is moved to the right position by the pressure of the first pressure receiving chamber.
- the first and second inflow ports communicate with the first and second tank ports, respectively.
- the first inflow port When the spool is at the left position, the first inflow port communicates with the passage and the second inflow port communicates with the second tank port, and when the spool is at the right position, the first inflow port is To the first tank port and the second inflow port And the over bets to be communicated to the passageway constitutes a switching valve,
- the valve body of the left-right switching valve is connected to both sides of the valve body of the switching valve. Then, the first and second return ports of the left direction switching valve are respectively connected to the first inflow port, and the first and second return ports of the right direction switching valve are connected to the second inflow port.
- a traveling hydraulic device is provided, which is in communication with each other, in which the load pressure of the right traveling hydraulic motor is introduced into the first pressure receiving chamber and the load pressure of the left traveling hydraulic motor is introduced into the second pressure receiving chamber. .
- First and second pressure introduction ports are formed in the valve body of the switching valve, and the first and second pressure introduction ports are communicated with the first and second pressure receiving chambers respectively.
- the second pressure introducing port is connected to a load pressure detecting section of the rightward switching valve, and the second pressure introducing port is connected to a load pressure detecting section of the leftward switching valve.
- first and second pistons are respectively fitted to both ends of the spool of the switching valve in the longitudinal direction to form the first and second pressure receiving chambers.
- the first and second pressure receiving chambers are formed by respectively inserting first and second pistons into both ends of the spool of the switching valve in the longitudinal direction, and first and second pressure receiving chambers are formed on the spool of the switching valve.
- a shaft hole is formed, the first pressure introduction port communicates with the first pressure receiving chamber through the first shaft hole, and the second pressure introduction port communicates with the second pressure receiving chamber through the second shaft hole.
- a slit groove communicating with the first and second pressure introduction ports is formed in the spool of the switching valve when the spool is in the neutral position.
- the valve body of the switching valve has an auxiliary relief valve communicating the passage with the second tank port, and first and second suction ports, respectively, and the passage is connected to the first and second suction ports.
- a pair of check valves communicating with the suction ports are provided, the first suction port is directly connected to the pump port of the left switching valve, and the second suction port is connected to the right switching valve. You may make it communicate directly with a pump port.
- FIG. 1 is a diagram of a conventional traveling hydraulic circuit.
- FIG. 2 is another conventional hydraulic circuit diagram for traveling.
- FIG. 3 is a cross-sectional view of the leftward switching valve of one embodiment of the traveling hydraulic device according to the present invention.
- FIG. 4 is a sectional view of the rightward switching valve of the embodiment.
- FIG. 5 is a sectional view of the switching valve of the above embodiment.
- FIG. 6 is a plan view showing a state where the switching valve and the left and right directional switching valves are connected.
- FIG. 7 is an explanatory diagram showing the communication state of each port of the left-right switching valve and the switching valve.
- FIGS. 1 and 2 The same members as those in the conventional example shown in FIG. 2 are denoted by the same reference numerals, and detailed description is omitted.
- the left directional control valve 5 has a spool hole 41 formed in the valve body 40.
- the spool hole 41 has a pump port 42 and a first and second load pressure detecting ports.
- the first actuator port 45 is connected to the forward port 3a of the left traveling hydraulic motor 3 via the counterbalance valve 13 and the second actuator port 46 is left.
- the spool 51 is connected to a reverse port 3 b of the traveling hydraulic motor 3 via a counterbalance valve 13, and is held at a neutral position by a spring 52.
- the pump port 42 and the first 'second load pressure detecting ports 43, 44 are shut off, and the first actuator port 45 and the first return port are shut off. 47 and the first tank port 49 communicate with each other, and the second factory overnight port 46, the second return port 48 and the second tank port 50 communicate with each other.
- the spool 51 is manually slid right and left to take a first position and a second position.
- the pump port 42 becomes the second load pressure detection port. 4 4, oil hole 5 3, first load pressure detection port 4 3, communicate with first actuator port 45, shut off first actuator overnight port 45 and first return port 47
- the second work port 46 communicates with the second return port 48, and the second return port 48 and the second tank port 50 are shut off.
- the pump port 42 When the spool 51 slides to the left to assume the second position, the pump port 42 is passed through the first load pressure detection port 43, the oil hole 53, and the first load pressure detection port 44. Communicate with the second faction port 46. The second faction port 46 and the second return port 48 are shut off. The first faction port 45 is the first return port 4. Communication with 7. First return port 47 and first tank port 49 are shut off.
- the valve body 40 is formed with a load check valve hole 40c in which an inlet port 54 and an outlet port 55 are opened, and communicates and shuts off these ports.
- a spool 56 is inserted into the load check valve hole 40 c to form a load check valve 7.
- the valve body 40 is formed with a pressure reducing valve hole 40d that opens the first port 57 and the second port 58, and a spool 59 that communicates and shuts off these ports is provided.
- the pressure reducing valve 8 is inserted into the pressure reducing valve hole 40 d. ⁇ The spool 59 is driven by the spring 60 and the pressure of the first pressure receiving chamber 61 to the first port 57 and the second port 58.
- the pump port 2 of the variable displacement hydraulic pump 1 is connected to the inlet port 54, and the outlet port 55 communicates with the pump port 42.
- the pump discharge path 2 is connected to the port 57, and the second port 58 communicates with the first pressure receiving chamber 61 and the load pressure detection path 10.
- the right directional control valve 6 has the same shape as the left directional control valve 5, and its first actuator port 45 is connected to the forward port 4a of the right traveling hydraulic motor 4.
- the second working port 46 is connected to the reverse port 4b of the right traveling hydraulic motor 4 via the counterbalance valve 13 via a counterbalance valve 13.
- the switching valve 23 has a valve body 70, and the spool hole 71 of the valve body 70 has first and second pressure introduction ports 72, 73, and The first and second ports 74 and 75, the first and second inflow ports 76 and 77, and the first and second tank ports 78 and 79 are open. These ports are communicated and blocked by a spool 80 inserted into the spool hole 71.
- a spring case 81 is attached to each of left and right end surfaces of the valve body 70 by bolts 82, and the spool 80 is held at a neutral position by a spring 83 provided in the spring case 81.
- the spool 80 When the spool 80 is in the neutral position, the spool 80 blocks the first and second ports 74 and 75 from the first and second inflow ports 76 and 77, respectively, and the first and second The inflow ports 76 and 77 communicate with the first and second tank ports 78 and 79, respectively.
- First and second pistons 84 and 85 are fitted near both ends in the longitudinal direction of the spool 80 to form a first pressure receiving chamber 86 and a second pressure receiving chamber 87, respectively.
- the spool 80 is provided with a plurality of first and second slit grooves 88, 89 opened at the first and second pressure introduction ports 72, 73 at intervals in the circumferential direction,
- the first slit groove 8 8 It communicates with the first pressure receiving chamber 86 through the first throttle 90 and the first shaft hole 91,
- the two-slit groove 89 communicates with the second pressure receiving chamber 87 through the second throttle 92 and the second shaft hole 93.
- the spool 80 slides rightward to the right position, whereby the first inflow port 76 is moved to the first position.
- the second inflow port 77 communicates with the second port 75.
- the spool 80 slides leftward to the left position, whereby the first inflow port 76 is moved to the first port.
- the second inflow port 77 communicates with the second tank port 79.
- the first port 74 and the second port 75 communicate with each other through a passage 94, and the passage 94 communicates with the second tank port 79 via an auxiliary relief valve 24 and is connected to the channel. It communicates with the first and second suction ports 95, 96 via a check valve 27.
- the first mating surface 40 a of the valve body 40 of the left directional switching valve 5 is connected to the first mating surface 70 a of the valve body 70 of the switching valve 23
- the second mating surface 40 b of the valve body 40 of the right-direction switching valve 5 is connected to and connected to the second mating surface 70 b of the valve body 70.
- valve body 101 of the turning direction switching valve 100 is connected to the second mating surface 40b of the valve body 40 of the left direction switching valve 5 in contact with it, and the right direction switching is performed.
- the directional switching valve for boom 102 is connected to the first mating surface 40a of the valve body 40 of valve 6 in contact with the directional switching valve for boom 102, and the directional switching for arm is switched to that valve body 103.
- the valve 104, the directional switching valve for the bucket 105, and the valve bodies 106, 107 of the valve 105 are sequentially connected and connected. As shown in FIG.
- the first tank port 78 and the second dinner port 79 of the switching valve 23 are opened to the first 'second mating surfaces 70a and 70b, respectively, and are arranged in the left-right direction.
- the first and second tank ports 49 and 50 of the switching valves 5 and 6 communicate with each other.
- the first inflow port 76 communicates with the first and second return ports 47, 48 of the left directional control valve 5, respectively, and the second inflow port 77 is connected to the first directional valve 6 of the right directional control valve 6. It communicates with the second return ports 47 and 48, respectively.
- the first pressure introduction port 72 of the switching valve 23 communicates with the first load pressure detection port 43 of the right direction switching valve 6 through a port 97 opening to the second mating surface 70b.
- the second pressure introduction port 73 communicates with the second load pressure detection port 44 of the left directional control valve 5 through a port 98 opened in the first mating surface 70a, and the first suction port 9 5 is open to the first mating surface 40a and communicates with the outlet port 55 of the left directional control valve 5, and the second suction port 96 is opened to the second mating surface 40b. It communicates with the outlet port 55 of the right direction switching valve 6.
- the inlet ports 54 of the left and right direction switching valves 5 and 6 are communicated with the first communication port 110 of the valve body 70 of the switching valve 23, and the first port 57 and the second port 58 Similarly, they are connected to the second and third communication ports 1 1 1 and 1 1 2.
- the pressure at the second load pressure detection port 44 of the left directional control valve 5, that is, the load pressure of the left traveling hydraulic motor 3 becomes the second pressure from the second pressure introduction port 73 of the directional control valve 23. It is introduced into the pressure receiving chamber 87, and the pressure of the first load pressure detection port 43 of the right direction switching valve 6, that is, the load pressure of the right traveling hydraulic motor 4 is changed to the first pressure introduction port 7 2 of the switching valve 23. Therefore, it is introduced into the first pressure receiving chamber 86.
- the spool 80 of the switching valve 23 is connected to the second pressure receiving chamber.
- load pressure and return oil flow into the switching valve 23 by connecting the valve bodies 40 of the left and right switching valves 5 and 6 to the valve body 70 of the switching valve 23 respectively.
- the first and second pressure receiving chambers 86 and 87 for pushing the spool 80 of the switching valve 23 left and right are formed by inserting the first and second pistons 84 and 85 into the spool 80. Therefore, their pressure receiving area is small, and the force for pushing the spool 80 left and right becomes small.
- the load pressure of the left and right traveling hydraulic motors 3 and 4 is high, if the load pressure is applied to the entire end surface of the spool 80, the pressure receiving area is large, and the pushing force of the spool 80 becomes abnormally large.
- the spring that urges 80 to the neutral position must also be large.
- the spool 80 is biased to the neutral position. Since the spring 83 can be made smaller and the spring case 81 and the bolt 82 can be made smaller, the entire switching valve 23 can be made compact, which is advantageous in terms of mounting space (volume) and cost. .
- the spool 80 of the switching valve 23 has a slit groove communicating with the first and second pressure introduction ports 72, 73 when the spool 80 is in the neutral position. 9 9 are formed. Therefore, when the switching valve 23 is in the neutral position, that is, when the load pressure of the left and right traveling hydraulic motors 3 and 4 travels straight, the slits 99 act to operate the left and right traveling hydraulic motors 3 and 4. Since the load pressure of 4 becomes equal, the straight running performance is improved.
- the first and second pressure introduction ports 72, 73 may be connected to the pump port 42 of the left-right directional switching valves 5, 6.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Fluid-Pressure Circuits (AREA)
- Operation Control Of Excavators (AREA)
- Motor Power Transmission Devices (AREA)
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP95913378A EP0753424A4 (en) | 1994-03-29 | 1995-03-29 | HYDRAULIC TRANSFER DEVICE |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6058845A JPH07266904A (ja) | 1994-03-29 | 1994-03-29 | 走行用油圧装置 |
JP6/58845 | 1994-03-29 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1995026277A1 true WO1995026277A1 (fr) | 1995-10-05 |
Family
ID=13096009
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1995/000600 WO1995026277A1 (fr) | 1994-03-29 | 1995-03-29 | Dispositif hydraulique de transfert |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0753424A4 (ja) |
JP (1) | JPH07266904A (ja) |
KR (1) | KR950027117A (ja) |
CN (1) | CN1148363A (ja) |
WO (1) | WO1995026277A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN115042857A (zh) * | 2022-07-14 | 2022-09-13 | 芜湖双翼液压件有限公司 | 一种履带式转向液压阀及控制系统 |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104776258B (zh) * | 2015-04-21 | 2017-06-13 | 南通华东油压科技有限公司 | 多路阀阀体铸件 |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04244604A (ja) * | 1991-01-31 | 1992-09-01 | Komatsu Ltd | 圧油供給装置 |
JPH06241203A (ja) * | 1993-02-12 | 1994-08-30 | Komatsu Ltd | 走行用油圧回路 |
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1994
- 1994-03-29 JP JP6058845A patent/JPH07266904A/ja active Pending
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1995
- 1995-03-08 KR KR1019950004734A patent/KR950027117A/ko active IP Right Grant
- 1995-03-29 WO PCT/JP1995/000600 patent/WO1995026277A1/ja not_active Application Discontinuation
- 1995-03-29 EP EP95913378A patent/EP0753424A4/en not_active Withdrawn
- 1995-03-29 CN CN95193096A patent/CN1148363A/zh active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04244604A (ja) * | 1991-01-31 | 1992-09-01 | Komatsu Ltd | 圧油供給装置 |
JPH06241203A (ja) * | 1993-02-12 | 1994-08-30 | Komatsu Ltd | 走行用油圧回路 |
Non-Patent Citations (1)
Title |
---|
See also references of EP0753424A4 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN115042857A (zh) * | 2022-07-14 | 2022-09-13 | 芜湖双翼液压件有限公司 | 一种履带式转向液压阀及控制系统 |
Also Published As
Publication number | Publication date |
---|---|
EP0753424A1 (en) | 1997-01-15 |
JPH07266904A (ja) | 1995-10-17 |
EP0753424A4 (en) | 1997-07-02 |
KR950027117A (ko) | 1995-10-16 |
CN1148363A (zh) | 1997-04-23 |
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