CN111043183A - Hydraulic power assisting device with flow stabilizing function - Google Patents

Hydraulic power assisting device with flow stabilizing function Download PDF

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Publication number
CN111043183A
CN111043183A CN201911367343.0A CN201911367343A CN111043183A CN 111043183 A CN111043183 A CN 111043183A CN 201911367343 A CN201911367343 A CN 201911367343A CN 111043183 A CN111043183 A CN 111043183A
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CN
China
Prior art keywords
oil
flow
hydraulic
cavity
duct
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Pending
Application number
CN201911367343.0A
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Chinese (zh)
Inventor
张勇
陶新高
姜朋朋
贾玲玲
仲勇
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Hefei Xieli Hydraulic Technology Co ltd
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Hefei Xieli Hydraulic Technology Co ltd
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Priority to CN201911367343.0A priority Critical patent/CN111043183A/en
Publication of CN111043183A publication Critical patent/CN111043183A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D48/00—External control of clutches
    • F16D48/02—Control by fluid pressure
    • F16D48/04—Control by fluid pressure providing power assistance
    • 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
    • F15B13/022—Flow-dividers; Priority valves
    • 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
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/1423—Component parts; Constructional details
    • F15B15/1447—Pistons; Piston to piston rod assemblies
    • 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
    • F15B20/00—Safety arrangements for fluid actuator systems; Applications of safety devices in fluid actuator systems; Emergency measures for fluid actuator systems
    • F15B20/007—Overload
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D48/00—External control of clutches
    • F16D48/02—Control by fluid pressure
    • F16D2048/0212—Details of pistons for master or slave cylinders especially adapted for fluid control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D48/00—External control of clutches
    • F16D48/02—Control by fluid pressure
    • F16D2048/0221—Valves for clutch control systems; Details thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D48/00—External control of clutches
    • F16D48/02—Control by fluid pressure
    • F16D2048/0227—Source of pressure producing the clutch engagement or disengagement action within a circuit; Means for initiating command action in power assisted devices
    • F16D2048/023—Source of pressure producing the clutch engagement or disengagement action within a circuit; Means for initiating command action in power assisted devices by pedal actuation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D48/00—External control of clutches
    • F16D48/02—Control by fluid pressure
    • F16D2048/0257—Hydraulic circuit layouts, i.e. details of hydraulic circuit elements or the arrangement thereof
    • F16D2048/0263—Passive valves between pressure source and actuating cylinder, e.g. check valves or throttle valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2500/00—External control of clutches by electric or electronic means
    • F16D2500/10—System to be controlled
    • F16D2500/102—Actuator
    • F16D2500/1026—Hydraulic
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2500/00—External control of clutches by electric or electronic means
    • F16D2500/10—System to be controlled
    • F16D2500/102—Actuator
    • F16D2500/1026—Hydraulic
    • F16D2500/1027—Details about the hydraulic valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2500/00—External control of clutches by electric or electronic means
    • F16D2500/10—System to be controlled
    • F16D2500/11—Application
    • F16D2500/1107—Vehicles
    • F16D2500/111—Agricultural
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2500/00—External control of clutches by electric or electronic means
    • F16D2500/30—Signal inputs
    • F16D2500/314—Signal inputs from the user
    • F16D2500/31406—Signal inputs from the user input from pedals
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2500/00—External control of clutches by electric or electronic means
    • F16D2500/50—Problem to be solved by the control system
    • F16D2500/501—Relating the actuator
    • F16D2500/5014—Filling the actuator cylinder with fluid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2500/00—External control of clutches by electric or electronic means
    • F16D2500/70—Details about the implementation of the control system
    • F16D2500/702—Look-up tables
    • F16D2500/70252—Clutch torque
    • F16D2500/70258—Throttle

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Hydraulic Clutches, Magnetic Clutches, Fluid Clutches, And Fluid Joints (AREA)

Abstract

The invention discloses a hydraulic power assisting device with a flow stabilizing function, which comprises a power assisting oil cylinder for operating power assisting and a flow dividing module for dividing hydraulic oil, wherein the flow dividing module comprises a flow dividing slide valve and a throttling element for controlling the flow of the hydraulic oil flowing into the power assisting oil cylinder, an oil inlet oil duct, a flow dividing oil duct and an oil outlet oil duct for providing oil for the power assisting oil cylinder are arranged in the flow dividing slide valve, the throttling element is arranged between the oil inlet oil duct and the oil outlet oil duct, and when the oil inlet flow at the throttling element is larger than the control flow of the throttling element, redundant flow of the hydraulic oil flows out from the flow dividing oil duct, so that the flow of the hydraulic oil flowing into the power assisting oil cylinder is kept stable. The hydraulic power-assisted hydraulic control system not only can realize hydraulic power assistance and improve the comfort of operating personnel during operation, but also has a flow stabilizing function, and can keep the flow of hydraulic oil flowing into the power-assisted oil cylinder stable when an engine of a machine changes from low speed to high speed, thereby avoiding misoperation and avoiding the machine from being in a half-clutch state.

Description

Hydraulic power assisting device with flow stabilizing function
Technical Field
The invention belongs to the technical field of engineering machinery, and particularly relates to a hydraulic power assisting device with a flow stabilizing function.
Background
With the rapid development of the national agricultural mechanization, the large-scale agricultural machinery is more and more widely applied. In the actual use process of large-scale agricultural machinery, an operator controls the machinery by controlling a clutch and braking, but because the large-scale agricultural machinery has larger weight and is poorer in working environment, the large-scale agricultural machinery often needs larger thrust to push a clutch pedal and a brake pedal, so that the operator needs to apply larger pedal force to the clutch pedal and the brake pedal, and the labor intensity of the operator is very high.
In order to reduce the treading force of operators on a clutch pedal and a brake pedal and reduce the labor intensity of the operators, some agricultural machines with hydraulic power assisting devices gradually appear on the market.
The hydraulic power assisting device is used for assisting the operation of a clutch and brake system of a machine and a vehicle, plays an important role in the using process of the machine, and directly influences the comfort of an operator during operation and the operation stability of the machine.
At present, when an engine of an agricultural machine changes from a low rotating speed to a high rotating speed, the flow of hydraulic oil flowing into an oil cylinder of the hydraulic power assisting device is easy to fluctuate and is difficult to keep stable, so that misoperation or a semi-clutch state of the machine can be caused, and the operation of an operator on the machine is directly influenced by the defects.
Disclosure of Invention
The invention aims to provide a hydraulic power assisting device with a flow stabilizing function, which is used for solving the problem that the flow of hydraulic oil flowing into an oil cylinder in the hydraulic power assisting device is difficult to keep stable, so that the generation of misoperation and the half-clutch state of a machine can be avoided.
Therefore, the invention adopts the following technical scheme:
the utility model provides a from hydraulic pressure booster unit of taking stationary flow function, is including the reposition of redundant personnel module that is used for the helping hand hydro-cylinder of operation helping hand and is used for hydraulic oil reposition of redundant personnel, wherein, reposition of redundant personnel module is including reposition of redundant personnel slide valve and being used for controlling the inflow the throttling element of the hydraulic oil flow in the helping hand hydro-cylinder, wherein, be equipped with oil feed oil duct, reposition of redundant personnel oil duct in the reposition of redundant personnel slide valve and be used for to the oil duct that produces of helping hand hydro-cylinder provides fluid, the throttling element is located between oil feed oil duct and the oil duct that produces, wherein, work as the oil feed flow of throttling element department is greater than the hydraulic oil of unnecessary flow is followed the reposition of redundant personnel oil duct branches out to guarantee the stability of the hydraulic oil.
Further, the power cylinder includes: the cylinder body is provided with an oil cavity, and an oil return port is formed in the cylinder body; and a piston assembly, establish including slidable piston, connection in the oil chamber hollow piston rod, movably setting on the piston are in adjusting pole, being used for in the hollow piston rod adjust the first reset element, the setting that the pole resets and be in hollow piston rod head be used for with the connecting rod that the rocking arm is connected of shifting, wherein, the piston will two chamber ways are separated into to the oil chamber, be oil feed chamber way and oil return chamber way respectively, oil feed chamber way and oil return chamber way are through the oil duct intercommunication of crossing that sets up in the piston, it is used for being connected with the separation and reunion footboard transmission to adjust the pole, the pole has and opens the initial position of crossing the oil duct and seals the operating position of crossing the oil duct, wherein, do not give when separation and reunion footboard adjust the pole when exerting force, the pole is in the initial position, the hydraulic oil that flows into the oil feed chamber way this moment passes through, And oil is returned from the oil return port after the oil return cavity channel, when the clutch pedal applies force to the adjusting rod and enables the adjusting rod to be in a working position, the oil passing channel is closed, and hydraulic oil in the oil inlet cavity channel pushes the piston assembly to move backwards so as to finish power assistance.
Further, the piston comprises a hollow piston body and a screw plug, wherein the hollow piston rod is connected in the inner hole of the hollow piston body, and the screw plug is in threaded connection in the inner hole of the hollow piston rod.
Furthermore, the oil passing channel is arranged in the plug screw, and a third connecting oil channel used for communicating the oil passing channel with the oil inlet cavity channel is arranged on the hollow piston rod.
Furthermore, the hydraulic power assisting device further comprises a pressure protection module for protecting the load mechanism, and the pressure protection module is connected with the power assisting oil cylinder in parallel.
Furthermore, the pressure protection module is a safety valve, an oil inlet of the safety valve is communicated with the oil outlet duct, and an oil outlet of the safety valve is communicated with the oil return port.
Further, the shunt spool valve includes: the valve body is internally provided with an oil inlet cavity communicated with the oil inlet oil duct, an oil distribution cavity communicated with the oil distribution oil duct, an oil outlet cavity communicated with the oil outlet oil duct and an oil pressing cavity; the valve core is arranged in the valve body in a sliding mode, a first connecting oil duct used for communicating the oil pressing cavity with the oil inlet cavity and a second connecting oil duct used for communicating the oil inlet cavity with the oil outlet cavity are arranged on the valve core, the throttling piece is arranged in the second connecting oil duct, and the valve core is provided with an initial position for preventing the oil inlet cavity from being communicated with the oil distribution cavity and a flow distribution position for communicating the oil inlet cavity with the oil distribution cavity; and the second reset element is used for resetting the valve core, when the oil inlet flow at the throttling element is greater than the control flow of the throttling element, redundant flow of hydraulic oil flows into the oil pressing cavity, the hydraulic oil in the oil pressing cavity pushes the valve core to move from an initial position to a shunting position at the moment, and the oil inlet cavity is communicated with the oil distributing cavity so as to realize outflow of the redundant flow of hydraulic oil.
Further, the throttle member includes a throttle plunger provided in the second connecting oil passage and a throttle hole provided in the throttle plunger.
Further, the valve body and the cylinder body are integrally formed and are of an integral structure.
Further, the first return element and the second return element are both return springs.
The invention has the following technical effects:
(1) the hydraulic booster can realize hydraulic boosting, and reduce the treading force of an operator during operation, thereby reducing the labor intensity of the operator and improving the comfort of the operator during operation; the hydraulic power-assisted hydraulic control system has a flow stabilizing function on the basis of realizing hydraulic power assistance, and can keep the flow of hydraulic oil flowing into a power-assisted oil cylinder stable and avoid flow fluctuation when an engine of a machine changes from a low rotating speed to a high rotating speed, so that misoperation can be avoided, the machine is prevented from being in a half-clutch state, and the operation stability of an operator on the machine is improved.
(2) The invention is also provided with a pressure protection module which can prevent the load mechanism from being damaged due to overlarge pressure in the power-assisted oil cylinder, and the safety is high.
In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail below with reference to the drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 illustrates a front view of a hydraulic power assist device with a flow stabilizing function according to an embodiment of the present invention;
FIG. 2 illustrates a top view of a hydraulic assist device with a flow stabilizing function according to an embodiment of the present invention;
FIG. 3 illustrates a side view of a hydraulic assist device with a flow stabilizing function in accordance with an embodiment of the present invention;
FIG. 4 is a cross-sectional view taken along line A-A of FIG. 3;
FIG. 5 is a cross-sectional view taken along line B-B of FIG. 3;
FIG. 6 is a partial cross-sectional view taken along line C-C of FIG. 3;
FIG. 7 is a schematic diagram illustrating a state of an adjusting lever of a hydraulic power assisting device with a flow stabilizing function according to an embodiment of the present invention in an operating position;
FIG. 8 is a schematic diagram illustrating a state of a valve element in a hydraulic assist device with a flow stabilizing function according to an embodiment of the invention in a flow dividing position; and
fig. 9 is a hydraulic schematic diagram of a hydraulic power assisting device with a flow stabilizing function according to an embodiment of the invention.
Description of the reference numerals
1. A booster cylinder; 11. A cylinder body;
111. an oil return port; 112. An oil inlet cavity channel;
113. an oil return cavity channel; 12. A piston;
121. an oil passage; 122. A hollow piston body;
123. a plug screw; 13. A hollow piston rod;
131. a third connecting oil passage; 14. Adjusting a rod;
141. a plug; 15. A first reset element;
16. a connecting rod; 2. A shunting module;
21. a shunt slide valve; 211. A valve body;
2111. an oil inlet cavity; 2112. An oil dividing cavity;
2113. an oil outlet cavity; 2114. Pressing an oil cavity;
212. a valve core; 2121. A first connecting oil passage;
2122. a second connecting oil passage; 213. A second reset element;
22. a throttle member; 221. A throttling plunger;
222. an orifice; 3. An oil inlet;
4. a pressure protection module; 5. An oil distributing opening.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
As shown in fig. 1 to 8, the hydraulic power assisting device with a flow stabilizing function of the present invention is provided with an oil inlet 3 connected to an oil pump and an oil return port 111 connected to an oil return tank, and the hydraulic power assisting device includes a power cylinder 1 for operation assistance and a flow dividing module 2 for dividing hydraulic oil.
The power-assisted oil cylinder 1 comprises a cylinder body 11 and a piston assembly, and an oil cavity is formed in the cylinder body 11.
The piston assembly comprises a piston 12 which is slidably arranged in the oil cavity, a hollow piston rod 13 which is fixedly connected to the piston 12 and extends out of the cylinder 11, an adjusting rod 14 which is arranged in the hollow piston rod 13 and can move axially along the hollow piston rod 13, a first reset element 15 for resetting the adjusting rod 14, and a connecting rod 16 which is arranged at the head of the hollow piston rod 13 and used for being connected with a gear shifting rocker arm.
The piston 12 divides the oil chamber into two chambers, namely an oil inlet chamber 112 and an oil return chamber 113, the oil return port 111 is communicated with the oil return chamber 113, the oil inlet chamber 112 and the oil return chamber 113 are communicated with an oil passing channel 121 arranged in the piston 12, the adjusting rod 14 is used for being in transmission connection with a clutch pedal, and the adjusting rod 14 has an initial position for opening the oil passing channel 121 and a working position for closing the oil passing channel 121.
The flow dividing module 2 comprises a flow dividing slide valve 21 and a throttling element 22 used for controlling the flow of hydraulic oil flowing into the power cylinder 1, wherein an oil inlet duct communicated with the oil inlet 3, an oil outlet duct communicated with an oil inlet cavity channel 112 in the power cylinder 1 and a flow dividing duct are arranged in the flow dividing slide valve 21, the throttling element 22 is arranged between the oil inlet duct and the oil outlet duct, and hydraulic oil which flows through the throttling element 22 after controlling the flow flows into the oil inlet cavity channel 112 in the power cylinder 1 through the oil outlet duct.
When the clutch pedal does not apply force to the adjusting rod 14, the adjusting rod 14 is at an initial position, and at this time, the hydraulic oil flowing into the oil inlet cavity channel 112 passes through the oil passage channel 121 and the oil return cavity channel 113 and then returns from the oil return port 111; when the clutch pedal is right adjust pole 14 and exert force and make when adjusting pole 14 removes to operating position, oil duct 121 closes, this moment oil feed chamber way 112 and oil return chamber way 113 do not communicate, the hydraulic oil accumulation in the oil feed chamber way 112 produces the oil pressure, thereby can promote piston assembly moves backward to helping hand when accomplishing the operation, this moment connecting rod 16 drives the rocking arm rotation of shifting in the gearbox, realizes the separation and reunion.
After the operation is completed, the clutch pedal does not exert any force on the adjusting rod 14, the adjusting rod 14 is reset to the initial position under the action of the first reset element 15, the oil inlet cavity channel 112 is communicated with the oil return cavity channel 113, oil in the oil inlet cavity channel 112 can be returned, and the gear shifting rocker arm in the gearbox has a pulling force on the connecting rod 16, so that the piston assembly can move forwards and restore to the initial position.
In addition, when the oil inlet flow rate at the throttle 22 is greater than the control flow rate of the throttle 22 (i.e. the oil inlet flow rate at the throttle 22 is greater than the maximum oil passing flow rate of the throttle 22), an excessive flow of hydraulic oil is branched out from the branch oil passage, so that the flow rate of hydraulic oil flowing into the booster cylinder 1 is kept stable.
Specifically, as shown in fig. 4 and 7, one end of the adjusting rod 14 adjacent to the piston 12 is provided with a plug 141 for closing the oil-passing passage 121, and the plug 141 is provided with a tapered part, and the tapered part of the plug 141 is inserted into the oil-passing passage 121 and abuts against a port of the oil-passing passage 121 when the adjusting rod 14 is in the working position, so as to close the oil-passing passage 121. The plug 141 is simple in design and good in sealing effect, and lays a powerful foundation for the operation assistance of the assistance oil cylinder.
Specifically, as shown in fig. 1 to 8, the shunt valve spool 21 includes a valve body 211, a spool 212 slidably disposed in the valve body 211, and a second returning element 213 for returning the spool 212.
An oil inlet cavity 2111 communicated with the oil inlet oil duct, an oil distribution cavity 2112 communicated with the oil distribution oil duct, an oil outlet cavity 2113 communicated with the oil outlet oil duct and an oil pressing cavity 2114 are arranged in the valve body 211, and an oil distribution port 5 communicated with the oil distribution oil duct and used for distributing oil to the outside is arranged on the valve body 211.
The valve core 212 is provided with a first connecting oil passage 2121 for communicating the oil pressing cavity 2114 with the oil inlet cavity 2111, and a second connecting oil passage 2122 for communicating the oil inlet cavity 2111 with the oil outlet cavity 2113, wherein the throttle 22 is arranged in the second connecting oil passage 2122, and the valve core 212 has an initial position for preventing the oil inlet cavity 2111 from communicating with the oil distribution cavity 2112, and a flow dividing position for communicating the oil inlet cavity 2111 with the oil distribution cavity 2112.
When the oil inlet flow at the position of the throttle member 22 is greater than the control flow of the throttle member 22, the excess flow of hydraulic oil flows into the oil pressing cavity 2114 through the first connecting oil passage 2121, at this time, the hydraulic oil in the oil pressing cavity 2114 accumulates and generates oil pressure, the valve element 212 slides from the initial position to the shunting position under the action of the oil pressure, at this time, the oil inlet cavity 2111 is communicated with the oil shunting cavity 2112, the excess flow of hydraulic oil can be discharged, and no back pressure is generated in the oil outlet cavity 2113.
The hydraulic booster can realize hydraulic boosting, and reduce the treading force of an operator during operation, thereby reducing the labor intensity of the operator and improving the comfort of the operator during operation; the hydraulic power-assisted hydraulic control system has a flow stabilizing function on the basis of realizing hydraulic power assistance, and can keep the flow of hydraulic oil flowing into a power-assisted oil cylinder stable and avoid flow fluctuation when an engine of a machine changes from a low rotating speed to a high rotating speed, so that misoperation can be avoided, the machine is prevented from being in a half-clutch state, and the operation stability of an operator on the machine is improved.
As shown in fig. 1 to 6 and 9, the hydraulic booster of the present invention further includes a pressure protection module 4 for protecting the load mechanism, the pressure protection module 4 is a safety valve, an oil inlet of the safety valve is communicated with the oil outlet passage, an oil outlet of the safety valve is communicated with the oil return port 111, and the safety valve is connected in parallel with the booster cylinder 1.
Specifically, the hydraulic oil is divided into two paths after flowing into the oil outlet passage, one path of the hydraulic oil flows into the oil inlet passage 112 of the power cylinder 1, the other path of the hydraulic oil flows into the oil inlet of the safety valve, the oil inlet and the oil outlet of the safety valve are not communicated under normal conditions, if the hydraulic oil is too large and exceeds a specified value of the safety valve, a valve in the safety valve is opened, the oil inlet and the oil outlet of the safety valve are communicated, and oil return can be realized through the safety valve, so that the purpose of protecting the load mechanism is achieved.
The invention can prevent the load mechanism from being damaged due to overlarge pressure in the power-assisted oil cylinder, and has high safety.
As shown in fig. 5 and 8, the throttle 22 includes a throttle plunger 221 provided in the second connecting oil passage 2122 and a throttle hole 222 provided in the middle of the throttle plunger 221. The cross-sectional size of the throttle hole 222 determines the amount of control flow of the throttle 22, and the throttle 22 has the advantages of simple structure and significant throttle control effect. In addition, the throttle member 22 can be replaced and used for different applications and machinery.
The valve body 211, the cylinder body 11 and the safety valve body are integrally formed and are of an integrated structure, so that the accuracy of the connection positions of oil passages among the power cylinder, the shunt slide valve and the safety valve can be ensured, and the difficulty in oil sealing is reduced.
As shown in fig. 4 and 7, the piston 12 includes a hollow piston body 122 and a plug screw 123, wherein the hollow piston rod 13 is fixedly connected in an inner hole of the hollow piston body 122, the plug screw 123 is threadedly connected in the inner hole of the hollow piston rod 13, the oil passage 121 is disposed in the plug screw 123, and the hollow piston rod 13 is provided with a third connecting oil passage 131 for communicating the oil passage 121 with the oil inlet cavity passage 112.
The design of the piston 12 and the hollow piston rod 13 can not only enhance the connection strength between the piston and the hollow piston rod, but also keep the central axis of the adjusting rod 14 consistent with the central line of the oil passage 121, thereby facilitating the adjustment rod 14 to seal the oil passage 121.
As shown in fig. 4 to 8, the first return element 15 and the second return element 213 are each a return spring having a simple structure but capable of ensuring a return effect.
Under the working condition that the oil inlet flow at the throttle member 22 is not larger than the control flow of the throttle member 22, when the clutch pedal does not apply force to the adjusting rod 14, the hydraulic oil provided by the oil pump sequentially flows through the oil inlet 3, the oil inlet duct, the oil inlet cavity 2111, the second connecting oil duct 2122 and the oil outlet cavity 2113 into the oil outlet duct, one path of the hydraulic oil in the oil outlet duct flows into the safety valve, the other path of the hydraulic oil flows into the oil inlet cavity duct 112 in the power-assisted cylinder 1, and the hydraulic oil returns from the oil return opening 111 after passing through the third connecting oil duct 131, the oil passing duct 121 and the oil return cavity duct 113.
Under the working condition that the oil inlet flow at the throttle member 22 is not greater than the control flow of the throttle member 22, when the clutch pedal applies force to the adjusting rod 14, the hydraulic oil provided by the oil pump sequentially flows into the oil outlet passage through the oil inlet 3, the oil inlet passage, the oil inlet cavity 2111, the second connecting oil passage 2122 and the oil outlet cavity 2113, one path of the hydraulic oil in the oil outlet passage flows into the safety valve, and the other path of the hydraulic oil flows into the oil inlet passage 112 in the power-assisted oil cylinder 1 to push the piston assembly to move backwards, so as to complete the operation assistance.
Under the working condition that the oil inlet flow at the position of the throttling element 22 is larger than the control flow of the throttling element 22, when a clutch pedal applies force to the adjusting rod 14, redundant flow of hydraulic oil sequentially passes through the oil distribution cavity 2112, the oil distribution oil duct and the oil distribution port 5 and then flows out, the hydraulic oil in the flow controlled by the throttling element 22 flows into the oil outlet cavity 2113 and then flows into the oil outlet duct, one path of the hydraulic oil in the oil outlet duct flows into the safety valve, and the other path of the hydraulic oil in the oil outlet duct flows into the oil inlet cavity channel 112 in the power-assisted oil cylinder 1 and is used for pushing the piston assembly to move backwards so as to finish operation power assistance.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. The hydraulic power assisting device with the flow stabilizing function is characterized by comprising a power assisting oil cylinder (1) used for operation power assisting and a flow dividing module (2) used for hydraulic oil flow dividing, wherein
The flow dividing module (2) comprises a flow dividing slide valve (21) and a throttling piece (22) used for controlling the flow of hydraulic oil flowing into the power-assisted oil cylinder (1), wherein an oil inlet oil duct, a flow dividing oil duct and an oil outlet oil duct used for providing oil for the power-assisted oil cylinder (1) are arranged in the flow dividing slide valve (21), the throttling piece (22) is arranged between the oil inlet oil duct and the oil outlet oil duct,
when the oil inlet flow at the throttling piece (22) is larger than the control flow of the throttling piece (22), redundant flow of hydraulic oil is branched out from the branch oil passage, so that the stability of the flow of the hydraulic oil flowing into the power-assisted cylinder (1) is ensured.
2. The hydraulic booster with the flow stabilizing function according to claim 1, wherein the booster cylinder (1) comprises:
a cylinder body (11) having an oil chamber, on which an oil return port (111) is provided; and
the piston assembly comprises a piston (12) which is arranged in the oil cavity in a sliding manner, a hollow piston rod (13) connected to the piston (12), an adjusting rod (14) which is movably arranged in the hollow piston rod (13), a first reset element (15) used for resetting the adjusting rod (14), and a connecting rod (16) which is arranged at the head of the hollow piston rod (13) and used for being connected with a gear shifting rocker arm,
wherein, piston (12) will two chambeies are separated into to the oil pocket, are oil feed chamber way (112) and oil return chamber way (113) respectively, oil feed chamber way (112) and oil return chamber way (113) are through oil duct (121) intercommunication of crossing that sets up in piston (12), adjust pole (14) and be used for being connected with clutch pedal transmission, it has the initial position of opening to adjust pole (14) crosses oil duct (121) and seals the operating position of crossing oil duct (121),
when the clutch pedal does not apply force to the adjusting rod (14), the adjusting rod (14) is located at an initial position, hydraulic oil flowing into the oil inlet cavity (112) passes through the oil passing oil duct (121) and the oil return cavity (113) and then returns from the oil return opening (111), when the clutch pedal applies force to the adjusting rod (14) and enables the adjusting rod (14) to be located at a working position, the oil passing oil duct (121) is closed, and the hydraulic oil in the oil inlet cavity (112) pushes the piston assembly to move backwards so as to complete assistance.
3. The hydraulic boosting device with the flow stabilizing function according to claim 2, wherein the piston (12) comprises a hollow piston body (122) and a screw plug (123), wherein the hollow piston rod (13) is connected in the inner hole of the hollow piston body (122), and the screw plug (123) is screwed in the inner hole of the hollow piston rod (13).
4. The hydraulic power assisting device with the flow stabilizing function according to claim 3, wherein the oil passing channel (121) is arranged in the screw plug (123), and a third connecting oil channel (131) for communicating the oil passing channel (121) with the oil inlet cavity channel (112) is arranged on the hollow piston rod (13).
5. The hydraulic power assisting device with the flow stabilizing function according to claim 2, further comprising a pressure protection module (4) for protecting a load mechanism, wherein the pressure protection module (4) is arranged in parallel with the power cylinder (1).
6. The hydraulic power assisting device with the flow stabilizing function according to claim 5, wherein the pressure protection module (4) is a safety valve, an oil inlet of the safety valve is communicated with the oil outlet duct, and an oil outlet of the safety valve is communicated with the oil return port (111).
7. The hydraulic booster with self flow stabilizing function according to claim 2, characterized in that the flow dividing slide valve (21) includes:
the valve body (211) is internally provided with an oil inlet cavity (2111) communicated with the oil inlet oil duct, an oil distribution cavity (2112) communicated with the oil distribution oil duct, an oil outlet cavity (2113) communicated with the oil outlet oil duct and an oil pressing cavity (2114);
the valve core (212) is slidably arranged in the valve body (211), a first connecting oil channel (2121) used for communicating the oil pressing cavity (2114) with the oil inlet cavity (2111) and a second connecting oil channel (2122) used for communicating the oil inlet cavity (2111) with the oil outlet cavity (2113) are arranged on the valve core (212), the throttling piece (22) is arranged in the second connecting oil channel (2122), and the valve core (212) has an initial position for preventing the oil inlet cavity (2111) from being communicated with the oil distribution cavity (2112) and a flow dividing position for communicating the oil inlet cavity (2111) with the oil distribution cavity (2112); and
a second reset element (213) for resetting the valve element (212),
when the oil inlet flow at the throttle part (22) is larger than the control flow of the throttle part (22), redundant flow of hydraulic oil flows into the oil pressing cavity (2114), the hydraulic oil in the oil pressing cavity (2114) pushes the valve core (212) to move from an initial position to a shunting position, and the oil inlet cavity (2111) is communicated with the oil shunting cavity (2112) so as to realize outflow of the redundant flow of hydraulic oil.
8. The hydraulic booster with a flow stabilizing function according to claim 7, characterized in that the throttle member (22) includes a throttle plunger (221) provided in the second connecting oil passage (2122) and a throttle hole (222) provided in the throttle plunger (221).
9. The hydraulic boosting device with the flow stabilizing function according to claim 7, wherein the valve body (211) is integrally formed with the cylinder body (11) and is of an integral structure.
10. The hydraulic boosting device with the flow stabilizing function according to claim 7, wherein the first return element (15) and the second return element (213) are both return springs.
CN201911367343.0A 2019-12-26 2019-12-26 Hydraulic power assisting device with flow stabilizing function Pending CN111043183A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201911367343.0A CN111043183A (en) 2019-12-26 2019-12-26 Hydraulic power assisting device with flow stabilizing function

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201911367343.0A CN111043183A (en) 2019-12-26 2019-12-26 Hydraulic power assisting device with flow stabilizing function

Publications (1)

Publication Number Publication Date
CN111043183A true CN111043183A (en) 2020-04-21

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN201911367343.0A Pending CN111043183A (en) 2019-12-26 2019-12-26 Hydraulic power assisting device with flow stabilizing function

Country Status (1)

Country Link
CN (1) CN111043183A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117536892A (en) * 2024-01-09 2024-02-09 江苏新世界泵业有限公司 High protection type elbow formula fluorine material axial-flow pump

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117536892A (en) * 2024-01-09 2024-02-09 江苏新世界泵业有限公司 High protection type elbow formula fluorine material axial-flow pump
CN117536892B (en) * 2024-01-09 2024-04-12 江苏新世界泵业有限公司 High protection type elbow formula fluorine material axial-flow pump

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