CN110748516A - Walking control device for engineering vehicle - Google Patents

Walking control device for engineering vehicle Download PDF

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Publication number
CN110748516A
CN110748516A CN201911033670.2A CN201911033670A CN110748516A CN 110748516 A CN110748516 A CN 110748516A CN 201911033670 A CN201911033670 A CN 201911033670A CN 110748516 A CN110748516 A CN 110748516A
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China
Prior art keywords
oil
valve
oil port
hole
port
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Granted
Application number
CN201911033670.2A
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Chinese (zh)
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CN110748516B (en
Inventor
韩国昊
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Xuzhou Jiuyang Machinery Manufacturing Co ltd
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Individual
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Publication of CN110748516A publication Critical patent/CN110748516A/en
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    • 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
    • F15B11/17—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors using two or more pumps
    • 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
    • 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
    • F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
    • F15B13/08—Assemblies of units, each for the control of a single servomotor only
    • 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
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F15B15/202—Externally-operated valves mounted in or on the actuator
    • 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
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/08—Servomotor systems incorporating electrically operated control means
    • F15B21/087—Control strategy, e.g. with block diagram
    • 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
    • F15B2211/205—Systems with pumps
    • F15B2211/20576—Systems with pumps with multiple pumps
    • 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
    • F15B2211/255—Flow 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
    • F15B2211/40—Flow control
    • F15B2211/405—Flow control characterised by the type of flow control means or 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
    • F15B2211/40—Flow control
    • F15B2211/42—Flow control characterised by the type of actuation
    • F15B2211/426—Flow control characterised by the type of actuation electrically or electronically
    • 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
    • F15B2211/40—Flow control
    • F15B2211/455—Control of flow in the feed line, i.e. meter-in control

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Analytical Chemistry (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

The invention relates to a walking control device for an engineering vehicle, which comprises a valve body, wherein a first oil port, a second oil port, an oil return port, a control oil port, a first mounting hole and a second mounting hole are formed in the valve body; the plug is fixedly connected to the lower end of the second mounting hole; the valve core is arranged in the second mounting hole and can control the size of the communication area of the first oil port and the second oil port; a spring; the proportional overflow valve is used for controlling the pressure in the control cavity; a one-way valve. The walking control device for the engineering vehicle has the advantages of simple structure and compact volume, and can realize the anti-slip and anti-suction of the walking motor of the engineering vehicle.

Description

Walking control device for engineering vehicle
Technical Field
The invention belongs to the technical field of engineering vehicles, and particularly relates to a walking control device for an engineering vehicle.
Background
The engineering vehicle is generally heavier, the road surface environment of the running place is severe, and in order to meet the characteristics of large tonnage, large climbing gradient, flexible steering and the like of the engineering vehicle, the hydraulic running is mostly adopted on the general medium-large engineering vehicle. The closed hydraulic circuit is adopted more in current engineering vehicle hydraulic pressure walking, and the accessible changes the switching that the direction of the inside swash plate of closed pump changed the direction that the pump goes out oil among the closed hydraulic circuit and realizes that the vehicle gos forward, moves back, thereby the accessible changes the regulation that the discharge capacity of the angle change pump of the inside swash plate of closed pump realized vehicle walking speed, and concrete control mode is: when the pump swash plate rotates positively, the vehicle moves forwards; as the pump swash plate angle increases, the vehicle forward speed increases; when the pump swash plate angle is reduced, the vehicle forward speed is reduced; when the pump swash plate is reversed, the vehicle is backing up. When the vehicle descends a heavy slope, the hydraulic oil on the low-pressure side of the closed pump can return to the oil inlet of the closed pump instead of the oil return tank, so that certain braking effect on equipment can be achieved, overspeed is effectively prevented, and meanwhile, the oil supplementing pump inside the closed pump can supplement oil to the oil circuit on the low-pressure side to prevent air pumping.
The engineering vehicle is very easily appeared when driving in muddy or pothole highway section because the adhesive force of wheel and road surface is less and the condition of taking place to skid, when the phenomenon of skidding appears, the motor flow that appears skidding phenomenon one side in the same hydraulic pressure closed circuit can greatly increased, and pressure can't establish in this hydraulic pressure closed circuit for the wheel that does not appear skidding in the same hydraulic pressure closed circuit further reduces with the adhesive force on road surface, and the drive of giving the driver brings the trouble.
Disclosure of Invention
The invention aims to solve the technical problem of providing a walking control device for engineering vehicles, which has the advantages of simple structure, compact volume and low manufacturing cost, can realize anti-slip control and prevent a walking motor from being sucked empty, and is used for solving the technical problem of the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows: a walking control device for engineering vehicles is characterized in that: the valve comprises a valve body, wherein a valve body through hole penetrating along the axial direction is formed in the valve body, the valve body through hole comprises a first mounting hole and a second mounting hole from top to bottom, an oil return opening, a first oil port and a second oil port which are communicated with the second mounting hole are formed in the side wall of the valve body at intervals, and a control oil port is formed by a lower opening of the second mounting hole;
the plug is fixedly connected to the lower end of the second mounting hole, a plug through hole penetrating along the axial direction is formed in the plug, a damper is arranged in the plug through hole, and a damping hole is formed in the damper;
the valve core is arranged in the second mounting hole in a vertically sliding mode, an oil return cavity is formed between the upper end face of the valve core and the bottom face of the second mounting hole and is communicated with an oil return opening, a control cavity is formed between the lower end face of the valve core and the plug, a first through flow hole with a downward opening and a second through flow hole used for communicating the first through flow hole with the first oil port are formed in the valve core, and the size of the communication area of the first oil port and the second oil port can be controlled by the vertical movement of the valve core;
the spring is arranged in the oil return cavity, one end of the spring is abutted against the bottom surface of the second mounting hole, and the other end of the spring is abutted against the valve core to enable the valve core to keep the trend of moving downwards;
the proportional overflow valve is fixedly installed in the first installation hole and used for controlling the pressure in the control cavity, an oil inlet and an oil outlet are formed in the proportional overflow valve, the oil inlet is communicated with the control cavity, and the oil outlet is communicated with the oil return cavity;
and when the first oil port is in a negative pressure state, oil in the control cavity can flow into the first oil port through the check valve.
Preferably, a first flow passage for communicating an oil inlet of the proportional overflow valve with the control cavity is arranged in the valve body.
Preferably, the valve core comprises a first shoulder, a reducing section and a second shoulder from top to bottom, and when the valve core moves up and down, the area covering the second oil port is changed through the second shoulder, so that the size of the communication area of the first oil port and the second oil port is changed.
Preferably, when the proportional overflow valve is not charged, the proportional overflow valve is in a fully opened state, oil in the control cavity returns to the oil return port through the proportional overflow valve, no pressure exists in the control cavity, when a certain voltage signal of the proportional overflow valve is given, a certain pressure is established in the control cavity, and the larger the voltage signal of the given proportional overflow valve is, the larger the pressure in the control cavity is.
Compared with the prior art, the invention has the advantages that:
the hydraulic control system is simple in structure and compact in size, and can be directly integrated into a shell of a walking motor, when the hydraulic control system is actually used, an oil return port of the hydraulic control system is connected with an oil tank, a first oil port is connected with one oil port of the walking motor, a second oil port is connected with one oil port of a closed plunger pump, the other oil port of the plunger pump is connected with the other oil port of the walking motor, a control oil port is connected with an oil supplementing pump, when the walking motor slips to cause over-high rotating speed, the pressure in a control cavity can be changed by controlling the voltage of a proportional overflow valve, the communication area of the first oil port and the second oil port is further changed, the first oil port generates a throttling effect, the passing flow of the walking motor is controlled, and; when the first oil port is empty, the oil can flow into the first oil port for oil supplement after passing through the check valve by the control oil port, so that empty suction is prevented.
Drawings
FIG. 1 is a cross-sectional view of an embodiment of the present invention;
fig. 2 is a schematic view of a hydraulic principle applied in the embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
As shown in fig. 1-2, is a preferred embodiment of the present invention.
A walking control device for engineering vehicle comprises
The valve body 1 is provided with a valve body through hole which penetrates through the valve body 1 along the axial direction, the valve body through hole comprises a first mounting hole 102 and a second mounting hole 101 from top to bottom, an oil return opening T, a first oil port A and a second oil port P which are communicated with the second mounting hole 101 are arranged on the side wall of the valve body 1 at intervals, and a control oil port X is formed by a lower opening of the second mounting hole 101.
The plug 3 and the plug 3 are fixedly connected to the lower end of the second mounting hole 101, a plug through hole penetrating along the axial direction is formed in the plug 3, a damper 4 is arranged in the plug through hole, and a damping hole 41 is formed in the damper 4.
The valve core 2 is arranged in the second mounting hole 101 in a vertically sliding manner, an oil return cavity 1b is formed between the upper end face of the valve core 2 and the bottom face of the second mounting hole 101, the oil return cavity 1b is communicated with an oil return port T, a control cavity 1a is formed between the lower end face of the valve core 2 and the plug 3, a first through hole 21 with a downward opening and a second through hole 22 for communicating the first through hole 21 with the first oil port A are formed in the valve core 2, the valve core 2 comprises a first shoulder 2a, a reducing section 2b and a second shoulder 2c from top to bottom, when the valve core 2 moves up and down, the area covering the second oil port P is changed through the second shoulder 2c, and therefore the size of the communication area of the first oil port A and the second oil port P is changed.
And a spring 5, wherein the spring 5 is arranged in the oil return cavity 1b, one end of the spring 5 is abutted against the bottom surface of the second mounting hole 101, and the other end of the spring 5 is abutted against the valve core 2 to keep the trend of downward movement of the valve core 2.
The proportional overflow valve 6 is fixedly installed in the first installation hole 102 and used for controlling the pressure in the control cavity 1a, an oil inlet 61 and an oil outlet 62 are arranged on the proportional overflow valve 6, a first flow passage 103 used for communicating the oil inlet 61 with the control cavity 1a is arranged in the valve body 1, and the oil outlet 62 is communicated with the oil return cavity 1 b; when the proportional overflow valve 6 is not charged, the proportional overflow valve 6 is in a completely opened state, the oil liquid in the control cavity 1a returns to the oil return port T through the proportional overflow valve 6, no pressure exists in the control cavity 1a, when a certain voltage signal of the proportional overflow valve 6 is given, a certain pressure is established in the control cavity 1a, and the larger the voltage signal of the given proportional overflow valve 6 is, the larger the pressure in the control cavity 1a is. The larger the pressure in the control chamber 1a is, the longer the distance the spool 2 moves upward against the force 5 of the spring is, and the smaller the area where the first port a and the second port B communicate with each other.
The check valve 7, the check valve 7 is set in the first through-flow hole 21, when the first oil port a is in the negative pressure state, the oil liquid in the control chamber 1a can flow into the first oil port a through the check valve 7.
The working principle and the process of the invention are as follows:
fig. 2 is a schematic diagram of the hydraulic principle of the present invention, which uses 2 walking control devices of the present invention, namely, a first walking control device 10a and a second walking control device 10 b. In practical use, the first travel control device 10a can be integrated directly into the housing of the first travel motor 9a, and the second travel control device 10a can be integrated directly into the housing of the second travel motor 9 b. The second oil port P of the first walking control device 10a and the second oil port P of the second walking control device 10a are both connected with one oil port of the closed plunger pump 7, the other oil port of the plunger pump 7 is connected with one oil port of the first walking motor 9a and one oil port of the second walking motor 9b, the first oil port a of the first walking control device 10a is connected with the other oil port of the first walking motor 9a, the first oil port a of the second walking control device 10b is connected with the other oil port of the second walking motor 9b, the oil return port T of the first walking control device 10a and the oil return port T of the second walking control device 10b are both connected with the oil tank 11, and the control oil port X of the first walking control device 10a and the control oil port X of the second walking control device 10b are both connected with the oil outlet of the oil replenishing pump 8. The first travel control device 10a and the second travel control device 10b of the present invention are automatically controlled by a central digital controller of the construction vehicle through rotational speed sensors mounted on the first travel motor 9a and the second travel motor 9 b.
When the first traveling motor 9a and the second traveling motor 9b are in a normal traveling state, the proportional overflow valve 6 of the first traveling control device 10a and the proportional overflow valve 6 of the second traveling control device 10b are not charged, no pressure exists in the control chamber 1a of the first traveling control device 10a, the valve element 2 is in the lowermost end position under the action of the spring 5, and the first oil port a and the second oil port P of the first traveling control device 10a are in a completely communicated state; similarly, the first oil port a and the second oil port P of the second walking control device 10b are in a completely communicated state; the flow rate output from the closed plunger pump 7 is divided equally to the first travel motor 9a and the second travel motor 9b by the first travel control device 10a and the second travel control device 10 b.
When one of the first traveling motor 9a and the second traveling motor 9b slips, taking the first traveling motor 9a as an example, the rotation speed sensor on the first traveling motor 9a detects that the rotation speed of the first traveling motor 9a is too high, the central digital controller outputs a control signal to the proportional overflow valve 6 of the first traveling control device 10a to raise a certain pressure in the control chamber 1a, so as to push the valve core 2 to move upward against the action force of the spring 5, the second shoulder 2c reduces the communication area of the first oil port a and the second oil port P, so that the first oil port a of the first traveling control device 10a generates a throttling action, so that the flow passing through the first traveling motor 9a is limited, the central digital controller changes the output control signal until the rotation speeds of the first traveling motor 9a and the second traveling motor 9b are the same, thereby achieving the anti-slip function. When the first traveling motor 9a just slips, negative pressure occurs in the first oil port a, and oil at the outlet of the oil replenishment pump 8 is directly replenished to the first oil port a through the control oil port of the first traveling control device 10a, the control chamber 1a, the check valve 7, the first through-flow hole 21 and the second through-flow hole 22, so that the first oil port a is prevented from being emptied.

Claims (4)

1. A walking control device for engineering vehicles is characterized in that: comprises that
The oil return valve comprises a valve body (1), wherein a valve body through hole penetrating along the axial direction is formed in the valve body (1), the valve body through hole comprises a first mounting hole (102) and a second mounting hole (101) from top to bottom, an oil return opening (T), a first oil port (A) and a second oil port (P) communicated with the second mounting hole (101) are formed in the side wall of the valve body (1) at intervals, and a control oil port (X) is formed by a lower opening of the second mounting hole (101);
the plug (3), the plug (3) is fixedly connected to the lower end of the second mounting hole (101), a plug through hole which penetrates through the plug (3) along the axial direction is formed in the plug, a damper (4) is arranged in the plug through hole, and a damping hole (41) is formed in the damper (4);
the valve core (2) is arranged in the second mounting hole (101) in a vertically sliding mode, an oil return cavity (1b) is formed between the upper end face of the valve core (2) and the bottom face of the second mounting hole (101), the oil return cavity (1b) is communicated with an oil return port (T), a control cavity (1a) is formed between the lower end face of the valve core (2) and the plug (3), a first through flow hole (21) with a downward opening and a second through flow hole (22) used for communicating the first through flow hole (21) with the first oil port (A) are formed in the valve core (2), and the communication area of the first oil port (A) and the second oil port (P) can be controlled by the vertical movement of the valve core (2);
the spring (5) is arranged in the oil return cavity (1b), one end of the spring (5) abuts against the bottom surface of the second mounting hole (101), and the other end of the spring (5) abuts against the valve core (2) to enable the valve core (2) to keep the trend of moving downwards;
the proportional overflow valve (6), the proportional overflow valve (6) is fixedly installed in the first installation hole (102) and used for controlling the pressure in the control cavity (1a), an oil inlet (61) and an oil outlet (62) are arranged on the proportional overflow valve (6), the oil inlet (61) is communicated with the control cavity (1a), and the oil outlet (62) is communicated with the oil return cavity (1 b);
and the check valve (7) is arranged in the first through flow hole (21), and when the first oil port (A) is in a negative pressure state, oil in the control cavity (1a) can flow into the first oil port (A) through the check valve (7).
2. The travel control device for a construction vehicle according to claim 1, wherein: a first flow passage (103) used for communicating the oil inlet (61) and the control cavity (1a) is arranged in the valve body (1).
3. The travel control device for a construction vehicle according to claim 1, wherein: the valve core (2) comprises a first convex shoulder (2a), a reducing section (2b) and a second convex shoulder (2c) from top to bottom, and when the valve core (2) moves up and down, the area covering the second oil port (P) is changed through the second convex shoulder (2c), so that the size of the communication area of the first oil port (A) and the second oil port (P) is changed.
4. The travel control device for a construction vehicle according to claim 1, wherein: when the proportional overflow valve (6) is not charged, the proportional overflow valve (6) is in a completely opened state, oil in the control cavity (1a) returns to the oil return port (T) through the proportional overflow valve (6), no pressure exists in the control cavity (1a), when a certain voltage signal of the proportional overflow valve (6) is given, a certain pressure is established in the control cavity (1a), and the larger the voltage signal of the given proportional overflow valve (6) is, the larger the pressure in the control cavity (1a) is.
CN201911033670.2A 2019-10-28 2019-10-28 Walking control device for engineering vehicle Active CN110748516B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201911033670.2A CN110748516B (en) 2019-10-28 2019-10-28 Walking control device for engineering vehicle

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Application Number Priority Date Filing Date Title
CN201911033670.2A CN110748516B (en) 2019-10-28 2019-10-28 Walking control device for engineering vehicle

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CN110748516A true CN110748516A (en) 2020-02-04
CN110748516B CN110748516B (en) 2021-05-14

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5377720A (en) * 1993-11-18 1995-01-03 Applied Power Inc. Proportional pressure reducing and relieving valve
JP2004251294A (en) * 2003-02-18 2004-09-09 Kayaba Ind Co Ltd Proportional solenoid relief valve
CN201103730Y (en) * 2007-11-07 2008-08-20 张松涛 Corrosion resistant scale overflow valve used for high-pressure small-flow equipment
CN103032619A (en) * 2012-12-14 2013-04-10 兰溪市中元电器有限公司 Two-position three-way inverse proportion decompression electromagnetic valve for AT (Automatic Transmission)
CN103522896A (en) * 2013-07-30 2014-01-22 山东临工工程机械有限公司 Front wheel auxiliary drive system of land leveller
CN108252973A (en) * 2018-01-20 2018-07-06 邵立坤 A kind of plug-in direct acting proportional pressure-reducing valve
CN108302079A (en) * 2018-04-04 2018-07-20 徐工集团工程机械股份有限公司科技分公司 A kind of gearbox dynamic output control system and control method
CN109798272A (en) * 2019-01-11 2019-05-24 徐州工业职业技术学院 A kind of composite variable pump and composite hydraulic control system

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5377720A (en) * 1993-11-18 1995-01-03 Applied Power Inc. Proportional pressure reducing and relieving valve
JP2004251294A (en) * 2003-02-18 2004-09-09 Kayaba Ind Co Ltd Proportional solenoid relief valve
CN201103730Y (en) * 2007-11-07 2008-08-20 张松涛 Corrosion resistant scale overflow valve used for high-pressure small-flow equipment
CN103032619A (en) * 2012-12-14 2013-04-10 兰溪市中元电器有限公司 Two-position three-way inverse proportion decompression electromagnetic valve for AT (Automatic Transmission)
CN103522896A (en) * 2013-07-30 2014-01-22 山东临工工程机械有限公司 Front wheel auxiliary drive system of land leveller
CN108252973A (en) * 2018-01-20 2018-07-06 邵立坤 A kind of plug-in direct acting proportional pressure-reducing valve
CN108302079A (en) * 2018-04-04 2018-07-20 徐工集团工程机械股份有限公司科技分公司 A kind of gearbox dynamic output control system and control method
CN109798272A (en) * 2019-01-11 2019-05-24 徐州工业职业技术学院 A kind of composite variable pump and composite hydraulic control system

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