CN111120444B - Differential compensation priority unloading valve - Google Patents
Differential compensation priority unloading valve Download PDFInfo
- Publication number
- CN111120444B CN111120444B CN202010073710.2A CN202010073710A CN111120444B CN 111120444 B CN111120444 B CN 111120444B CN 202010073710 A CN202010073710 A CN 202010073710A CN 111120444 B CN111120444 B CN 111120444B
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- Prior art keywords
- valve core
- differential
- priority valve
- oil
- hole
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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
- 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
- F15B13/021—Valves for interconnecting the fluid chambers of an actuator
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/06—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
- B62D5/07—Supply of pressurised fluid for steering also supplying other consumers ; control thereof
- B62D5/075—Supply of pressurised fluid for steering also supplying other consumers ; control thereof using priority valves
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Analytical Chemistry (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Safety Valves (AREA)
Abstract
The invention relates to engineering machinery, in particular to a differential compensation priority unloading valve which comprises a valve body, wherein a priority valve core is arranged in the valve body, the left end of the priority valve core is provided with a spring and a P1 control cavity communicated with an LS steering signal pressure cavity, the right end of the priority valve core is provided with a differential hole and an oil drainage hole, the differential hole is provided with a differential screw plug, the oil drainage hole is communicated with an oil return channel, the priority valve core and the differential screw plug form a P3 cavity, the priority valve core is also provided with a signal hole, and the signal hole is communicated with a P3 cavity and a CF oil channel; the pressure difference between the left end and the right end of the priority valve core controls the opening of the priority valve core and the CF oil duct. The left end of the priority valve core is provided with a P1 oil cavity for introducing a steering signal, the right end of the priority valve core is provided with a differential port and is provided with a differential screw plug to form a P3 cavity, the differential screw plug enables the action area of the P3 oil cavity to be smaller than that of the P1 oil cavity, the oil pressure difference of the left end and the right end of the priority valve core can be quickly increased, the steering work flow is synchronously increased, and the steering efficiency of a main machine is greatly improved.
Description
Technical Field
The invention belongs to the technical field of hydraulic steering systems, and relates to a differential compensation priority unloading valve.
Technical Field
A load sensing full-hydraulic steering system is mainly used for vehicles with large steering power, such as engineering machinery, agricultural machinery and the like, such as a loader, and has the disadvantages of severe working environment, poor road conditions, and large resistance in sand, mud, mountain land and the like. When the traditional steering unloading valve works, the pressures at two ends of the valve core are equal, and the valve core is pushed only under the action of the spring to control the opening degree of the valve core. When the steering resistance is large, the problems of insufficient opening degree of a valve core, insufficient steering oil, insufficient steering speed and even no direction of rotation exist, and when a user encounters such severe working conditions, the user often has the problems of labor consumption, oil consumption and time consumption and needs to apply larger steering force. In order to solve the problem of steering force, the prior art replaces a steering oil cylinder with a larger cylinder diameter for a main machine, and improves the working efficiency of the main machine, which is a problem that users of the main machine want to solve.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a differential compensation priority unloading valve with high steering efficiency.
In order to achieve the purpose, the invention adopts the technical scheme that: the utility model provides a preferential unloading valve of differential compensation, includes the valve body, is equipped with preferential case in the valve body, and preferential case left end is equipped with the P1 control chamber of spring and intercommunication LS turn to signal pressure chamber, and its difference lies in: the right end of the priority valve core is provided with a differential hole and an oil drainage hole, the differential hole is provided with a differential screw plug, the oil drainage hole is communicated with the oil return channel, the priority valve core and the differential screw plug form a P3 cavity, and the priority valve core is also provided with a signal hole which is communicated with the P3 cavity and the CF oil duct; the pressure difference between the left end and the right end of the priority valve core controls the opening of the priority valve core and the CF oil duct.
Compared with the prior art, the invention has the following beneficial effects: the left end of the priority valve core is provided with a P1 control oil cavity for introducing a steering signal LS, the right end of the priority valve core is provided with a differential port and is provided with a differential screw plug to form a P3 cavity, the action area of the right end of the priority valve core is smaller than that of the P1 oil cavity due to the differential screw plug, when a steering system does not work, the pressure difference change of the two ends of the priority valve core is small, and the opening degree of the priority valve core and the CF oil channel is small. When the steering system works, the LS signal pressure pulls up the oil pressure of the P1 control cavity, and the action area difference is added, so that the oil pressure difference at the left end and the right end of the priority valve core is quickly increased, the opening degrees of the priority valve core and the CF oil passage can be quickly increased, the steering working flow is synchronously and quickly increased, and the steering efficiency of the main engine is greatly improved.
Drawings
FIG. 1 is a hydraulic schematic diagram of a differential compensation priority unloader valve of the present invention;
FIG. 2 is a schematic side view profile of the present invention;
FIG. 3 is a schematic structural view of a cross-sectional view A-A of FIG. 2;
FIG. 4 is a schematic view of the sectional view B-B of FIG. 2;
the notation in the figure is: 1-differential screw plug, 2-valve body, 3-priority valve core, 4-spring, 5-Ls control port screw plug, 6-overflow valve, 7-damping hole, 8-differential hole and 9-oil drainage hole.
Detailed Description
For better understanding of the technical solutions of the present invention, the technical solutions of the present invention will be further described below with reference to the drawings and the detailed description of the present invention.
As shown in fig. 1 and 2, the differential compensation priority unloading valve comprises a differential plug screw 1, a valve body 2, a priority valve core 3, a spring 4, a Ls control port plug screw 5 and an Ls overflow valve 6, wherein the differential plug screw 1 is arranged at the right end of the priority valve core 3, the matching position of the differential plug screw 1 is a differential hole 8, a P3 cavity is formed by a damping hole 7 on the priority valve core 3 and the differential plug screw 1, and leakage oil at the matching position of the differential plug screw is communicated with an oil return channel T1 through an oil drainage hole 9. The left end of the priority valve core 3 is provided with a spring 4 and a P1 control cavity communicated with a Ls control port screw plug 5, the P1 control cavity is provided with an overflow valve 6 with overload protection, the left end of the priority valve core 3 bears the acting force and the spring force of the P1 control cavity acting on the sectional area A-A, the right end of the priority valve core 3 bears the acting force of the P3 control cavity acting on the sectional area B-B, and the priority valve core 3 moves under the acting forces of the two ends to control the opening degree of the priority valve core.
When the steering system does not work: the steering gear does not work, the steering gear and the CF oil duct are located at closed positions, the pressure of the LS control port is zero, oil from the steering pump enters the oil duct P, enters the CF oil duct through the gear opening of the priority valve core 3 and the valve body 2 and enters the P3 cavity through the damping hole 7, hydraulic oil acts on the right end of the priority valve core 3, overcomes the spring 4, the priority valve core 3 moves leftwards until all the oil enters the P2 shunt oil duct, the pressure at the two ends of the priority valve core is only the acting force of the spring 4 at the moment, the pressure difference delta P = P-P1 is small in change, and the differential screw plug 1 and the priority valve core 3 are always in a matched state.
When the steering system works: when the steering gear works, oil enters the steering gear through the CF oil duct, the steering gear is connected with the steering oil cylinder to push the loader to steer, a pressure signal of the LS port acts on the left end of the priority valve core 3 through the LS control port screw plug 5, the priority valve core 3 moves to the right under the action of the spring 4, and the opening degrees of the oil duct P and the CF oil duct are increased. As shown in fig. 3 and 4, due to the presence of the differential plug 1, the right end acting area of the priority valve element 3 is smaller than the left end acting area, and the acting force of the spring 4 is added, so that the left end acting force of the priority valve element 3 is larger than the right end, the pressure difference between the two ends is rapidly increased along with the increase of the steering working pressure, the opening degree of the priority valve element 3 is also rapidly increased, and the steering working flow rate is rapidly increased. The larger the diameter of the engagement rod of the differential plug 1 is, the larger the difference in the area of the acting force between both ends of the priority valve body 3 is, and the larger the amount of change in the steering operation flow rate increases when the steering operation pressure increases.
Although the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the scope of the invention.
Claims (1)
1. The utility model provides a preferential unloading valve of differential compensation, includes valve body (2), is equipped with preferential case (3) in the valve body, and preferential case (3) left end is equipped with spring (4) and communicates the P1 control chamber of LS turn to signal pressure chamber, its characterized in that: the high-pressure oil leakage valve is characterized in that a differential hole (8) and an oil drainage hole (9) are formed in the right end of the priority valve core (3), a differential screw plug (1) is arranged at the position of a differential port (8), the oil drainage hole (9) is communicated with an oil return channel, leakage oil at the position where the differential hole (8) is matched with the differential screw plug (1) is communicated with the oil return channel through the oil drainage hole (9), the priority valve core (3) and the differential screw plug (1) form a P3 cavity, a signal hole (7) is further formed in the priority valve core (3), and the signal hole (7) is communicated with the P3 cavity and a CF oil channel; the differential pressure at the left end and the right end of the priority valve core (3) controls the opening degree of the priority valve core (3) and the CF oil passage, the diameter of the differential screw plug (1) is increased in a segmented mode towards the direction far away from the differential hole (8), and the joint of the part with the smaller diameter in the differential hole (8) and the part with the larger diameter at the outer side is of a frustum structure;
due to the existence of the differential screw plug (1), the right end action area of the priority valve core (3) is smaller than the left end action area, and the action force of the spring (4) is added, so that the left end action force of the priority valve core (3) is larger than the right end, the pressure difference at the two ends is rapidly increased along with the rise of the steering working pressure, the opening degree of the priority valve core (3) is also rapidly increased, the steering working flow is rapidly increased, the larger the diameter of a matching rod of the differential screw plug (1) is, the larger the difference of the action force areas at the two ends of the priority valve core (3) is.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010073710.2A CN111120444B (en) | 2020-01-22 | 2020-01-22 | Differential compensation priority unloading valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010073710.2A CN111120444B (en) | 2020-01-22 | 2020-01-22 | Differential compensation priority unloading valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111120444A CN111120444A (en) | 2020-05-08 |
| CN111120444B true CN111120444B (en) | 2022-06-14 |
Family
ID=70492731
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010073710.2A Active CN111120444B (en) | 2020-01-22 | 2020-01-22 | Differential compensation priority unloading valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111120444B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07238905A (en) * | 1994-02-24 | 1995-09-12 | Kobe Steel Ltd | Sequence valve |
| CN1959166A (en) * | 2006-11-08 | 2007-05-09 | 宁波华液机器制造有限公司 | Direct action type proportional pressure-reducing valve |
| CN103062148A (en) * | 2013-01-30 | 2013-04-24 | 浙江海克力液压有限公司 | Energy-saving type prior unloading valve |
| CN203098442U (en) * | 2013-01-30 | 2013-07-31 | 浙江海克力液压有限公司 | Energy-saving type priority unloading valve |
| CN203770276U (en) * | 2014-03-27 | 2014-08-13 | 浙江海宏液压科技股份有限公司 | Double-way oil supply priority valve |
| CN108884947A (en) * | 2016-03-28 | 2018-11-23 | 帕克-汉尼芬公司 | Ratio sequence valve with pressure amplifying device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8540207B2 (en) * | 2008-12-06 | 2013-09-24 | Dunan Microstaq, Inc. | Fluid flow control assembly |
| CN204253482U (en) * | 2014-11-17 | 2015-04-08 | 宁波海宏液压有限公司 | A kind of two-way unloading valve |
-
2020
- 2020-01-22 CN CN202010073710.2A patent/CN111120444B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07238905A (en) * | 1994-02-24 | 1995-09-12 | Kobe Steel Ltd | Sequence valve |
| CN1959166A (en) * | 2006-11-08 | 2007-05-09 | 宁波华液机器制造有限公司 | Direct action type proportional pressure-reducing valve |
| CN103062148A (en) * | 2013-01-30 | 2013-04-24 | 浙江海克力液压有限公司 | Energy-saving type prior unloading valve |
| CN203098442U (en) * | 2013-01-30 | 2013-07-31 | 浙江海克力液压有限公司 | Energy-saving type priority unloading valve |
| CN203770276U (en) * | 2014-03-27 | 2014-08-13 | 浙江海宏液压科技股份有限公司 | Double-way oil supply priority valve |
| CN108884947A (en) * | 2016-03-28 | 2018-11-23 | 帕克-汉尼芬公司 | Ratio sequence valve with pressure amplifying device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111120444A (en) | 2020-05-08 |
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