High pressure oil pump PCV pressure control valve
By designing a high-pressure oil pump PCV pressure control valve, the problems of valve core jamming and induction magnet demagnetization in the fuel system were solved, achieving higher control accuracy and dynamic response, improving engine stability and reducing noise, and expanding the applicable operating conditions.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- SUZHOU DIANZHONG FUEL INJECTION TECHNOLOGY CO LTD
- Filing Date
- 2026-03-17
- Publication Date
- 2026-06-05
AI Technical Summary
Existing fuel intake control valves in diesel common rail systems suffer from problems such as valve core jamming, demagnetization of the sensing magnet, difficulty in maintenance due to their precision structure, weak anti-pollution capability, and high-pressure oil pump losses. These issues result in unstable flow control, low control accuracy, high noise, and unstable engine operation.
The high-pressure oil pump PCV pressure control valve is adopted, and the pressure is adjusted by the stroke shim to control the fuel flow. Combined with the design of the guide column, valve sleeve, valve body, armature, return spring and solenoid coil, it can achieve precise matching and fast response, reduce jamming and wear, and improve control accuracy and structural strength.
It improves the accuracy and dynamic response speed of fuel flow control, reduces high pressure fluctuations, enhances engine idling stability and noise level, expands the applicable operating conditions range, and reduces maintenance costs.
Smart Images
Figure CN122148463A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the technical field of components in high-pressure common rail fuel systems, specifically to the high-pressure fuel pump PCV pressure control valve. Background Technology
[0002] Fuel intake control valves are widely used in diesel common rail systems. Current technology uses SCV intake control valves for fuel flow adjustment, meaning fuel flow is controlled via the inflow plunger chamber side. (See...) Figure 1 In practical use, the following technical problems are commonly found: The valve core and valve sleeve have a very small clearance and require high fuel cleanliness. Impurities, gum, and moisture in the fuel can easily cause the valve core to stick, resulting in unstable flow control and affecting the pressure control accuracy of the common rail fuel system. The sensing magnetic block installed in the valve body is prone to demagnetization under the high temperature and long-term vibration of the engine, which will weaken or lose the position detection signal, reduce the reliability of the closed-loop control of the control valve, and the sensing magnetic block is magnetic and easily attracts ferromagnetic impurities in the oil circuit. After the impurities accumulate, they will aggravate the valve core jamming and wear, and shorten the service life of the control valve. The overall structure is precise, making it difficult to process and assemble. It is also difficult to repair after a malfunction, usually requiring complete replacement, resulting in high maintenance costs. It has weak resistance to pollution and environmental interference, and is prone to control deviations under harsh working conditions, which can affect the normal operation of the engine. High-pressure oil pumps have internal losses (dead point oil volume + oil leakage loss), and the oil supply of high-pressure oil pumps is prone to deviation.
[0003] Therefore, there is an urgent need to develop a pressure control valve that adjusts fuel quantity by controlling the fuel supply side through pressure, so as to achieve higher control accuracy, faster dynamic response, smaller high pressure fluctuations, smoother engine idling, lower noise, better combustion and emissions, higher structural strength, and wider applicability to operating conditions. Summary of the Invention
[0004] To address the aforementioned issues, this invention provides a high-pressure oil pump PCV pressure control valve, which adjusts the pressure via a stroke shim to control fuel flow. This valve offers higher control precision, faster dynamic response, less high-pressure fluctuation, smoother engine idling, lower noise, better combustion and emissions, higher structural strength, and wider applicability, completely overcoming the shortcomings of SCV valves.
[0005] A high-pressure oil pump PCV pressure control valve, characterized in that it comprises: The valve core includes a guide post, and the bottom of the guide post is provided with a valve core stop protrusion and a flow avoidance ring groove from bottom to top. The valve sleeve includes a guide through hole located at the radial center, and a sealing valve port is provided at the bottom of the radial through hole. The sealing valve port cooperates with the valve core stop protrusion for closing operation. The lower outer ring surface of the valve sleeve is provided with a number of radially inwardly communicating oil inlets. The oil inlets are respectively connected to the guide through hole and are arranged towards the flow avoidance ring groove. The valve body includes a valve core guide cavity and several coil mounting cavities. The valve core guide cavity is located at the lower part of the radial center of the valve body, and the several coil mounting cavities are arranged in a ring around the valve body. armature; Return spring; And electromagnetic coils; The valve sleeve is fixedly installed in the lower end mounting cavity of the valve body. The lower part of the valve sleeve protrudes downward from the lower surface of the valve body. The guide post of the valve core is inserted into the guide through hole. After the valve sleeve is fixedly installed in the valve body, it forms an armature mounting cavity. The guide post of the valve core protrudes upward from the guide through hole and is fixedly installed with the armature. The top of the guide post of the valve core is located at the bottom of the valve core guide movable cavity. The return spring is placed in the valve core guide movable cavity, and the bottom of the return spring is pressed against the top of the guide post. Electromagnetic coils are arranged in the coil mounting cavity. When all the electromagnetic coils are energized, they attract the armature upward, thereby driving the valve core stop protrusion to fit against the sealing valve port and close the entire oil passage. When the electromagnetic coils are de-energized, the return spring pushes the valve core downward, and the valve core stop protrusion disengages from the sealing valve port, making the oil passage unobstructed.
[0006] Its further features are: The upper outer periphery of the valve sleeve is fastened to the lower internal thread of the valve body by a thread. A retaining ring is provided between the outer shaft of the upper surface of the valve sleeve and the lower surface of the corresponding body of the valve body to ensure the height of the armature mounting cavity is stable and reliable. The upper surface of the valve sleeve is provided with a clearance groove corresponding to the lower area of the armature, which makes the height of the entire pressure control valve relatively small. The flow clearance groove, when in the closed or open position, completely covers the height of the oil inlet hole of the annular fabric; The valve core and valve sleeve are precision machined. The surface roughness of the guide body of the valve core is Rz0.4 and the cylindricity is 1 micrometer. The surface roughness of the inner hole of the valve sleeve is Rz0.9 and the cylindricity is 1 micrometer. The fit clearance between the guide column of the valve core and the guide through hole of the valve sleeve is controlled at 6~9 micrometers, which effectively ensures the free sliding of the valve core and the accuracy of the valve core operation, prevents the valve core from jamming and sliding vibration, and reduces abnormalities such as uneven wear and wobble. The improved roughness ensures the wear resistance of the valve core and valve sleeve and improves the reliability of the valve core operation. The valve core and valve sleeve sealing port has a 120° conical sealing structure, which can effectively reduce wear caused by the seal. The electromagnetic coil adopts a low hysteresis magnetic circuit structure with a dynamic response time of 4.3ms; The oil inlet holes are arranged in a cross shape to stabilize the oil intake and reduce fuel pulsation interference.
[0007] An application of a high-pressure oil pump PCV pressure control valve, characterized in that: it includes a PCV pressure control valve, a common rail high-pressure oil pump, and a high-pressure oil pump outlet valve; the oil inlet channel of the external common rail high-pressure oil pump is connected to the mixing oil chamber after the PCV pressure control valve is installed, and the mixing oil chamber is connected to the oil inlet hole.
[0008] Its further features are: The common rail high-pressure oil pump has a damping limit block at the bottom of the valve core after installation. The damping limit block has several damping holes in the thickness direction. Below the damping limit block is a plunger cavity, and the output oil circuit of the plunger cavity is connected to the high-pressure oil pump outlet valve.
[0009] The invention effectively reduces jamming, internal leakage, and sliding vibration, improves control accuracy and long-term reliability under high and low temperature conditions, has a reasonable structure, is easy to assemble, and is suitable for use in high-pressure common rail systems. Attached Figure Description
[0010] Figure 1 This is a front sectional view of the present invention; Figure 2 This is a cross-sectional view of the assembly of the valve body, return spring, and electromagnetic coil of the present invention. Figure 3 This is an exploded view of the valve core, valve sleeve, and armature of the present invention; Figure 4 A schematic diagram of the valve core's working process in this invention; Figure 5 A cross-sectional schematic diagram of the PCV pressure control valve assembled on a common rail high-pressure oil pump. The names corresponding to the serial numbers in the diagram are as follows: Valve core 10, guide post 11, valve core stop protrusion 12, flow avoidance ring groove 13, valve sleeve 20, guide through hole 21, sealing valve port 211, oil inlet hole 22, avoidance groove 23, valve body 30, valve core guide movable cavity 31, coil mounting cavity 32, lower end mounting cavity 33, armature mounting cavity 34, armature 40, return spring 50, electromagnetic coil 60, retaining ring 70, damping limit block 80, damping hole 81; PCV pressure control valve 100, mixing chamber 101, common rail high-pressure oil pump 200, oil inlet channel 201, plunger chamber 202, and high-pressure oil pump outlet valve 300. Detailed Implementation
[0011] High-pressure oil pump PCV pressure control valve, see Figures 1-4 It includes a valve core 10, a valve sleeve 20, a valve body 30, an armature 40, a return spring 50, and an electromagnetic coil 60; The valve core 10 includes a guide post 11, and the bottom of the guide post 11 is provided with a valve core stop protrusion 12 and a flow avoidance ring groove 13 from bottom to top; The valve sleeve 20 includes a guide through hole 21 located at the radial center. A sealing valve port 211 is provided at the bottom of the radial through hole 21. The sealing valve port 211 cooperates with the valve core stop protrusion 12 for closing operation. The lower outer ring surface of the valve sleeve 20 is provided with a number of radially inwardly communicating oil inlet holes 22. The oil inlet holes 22 are respectively connected to the guide through hole 21 and are arranged towards the flow avoidance ring groove 13. The valve body 30 includes a valve core guide cavity 31 and a plurality of coil mounting cavities 32. The valve core guide cavity 31 is located at the lower part of the radial center of the valve body 30, and the plurality of coil mounting cavities 32 are arranged in a ring around the valve body 30. A valve sleeve 20 is fixedly installed in the lower end mounting cavity 33 of the valve body 30. The lower part of the valve sleeve 20 protrudes downward from the lower surface of the valve body 30. The guide post 11 of the valve core 10 is inserted into the guide through hole 21. After the valve sleeve 20 is fixedly installed in the valve body 30, it forms an armature mounting cavity 34. The guide post 11 of the valve core 10 protrudes upward from the guide through hole 21 and is fixedly installed with an armature 40. The top of the guide post 11 of the valve core 10 is located at the bottom of the valve core guide movable cavity 31. The return spring 50 is placed in the valve core guide cavity. Inside the active cavity 31, the bottom of the return spring 50 is pressed against the top of the guide column 11. Electromagnetic coils 60 are arranged in the coil mounting cavity 32. When all the electromagnetic coils 60 are energized, they attract the armature 40 upward, thereby driving the valve core stop protrusion 12 to fit against the sealing valve port 211 and close the entire oil passage. When the electromagnetic coils 60 are de-energized, the return spring 50 pushes the valve core 10 down, and the valve core stop protrusion 12 disengages from the sealing valve port 211, making the oil passage unobstructed.
[0012] In specific implementation, the upper outer periphery of the valve sleeve 20 is fastened to the lower internal thread of the valve body 30 by a threaded fastener. A retaining ring 70 is provided between the outer shaft of the upper surface of the valve sleeve 20 and the lower surface of the corresponding main body of the valve body 30, which ensures the high stability and reliability of the armature mounting cavity 34. The upper surface of the valve sleeve 20 is provided with a relief groove 23 corresponding to the lower area of the armature 40, which makes the height of the entire PCV pressure control valve 100 relatively small. The flow clearance groove 13, in its closed or open position, completely covers the height of the oil inlet hole 22 of the annular cloth.
[0013] In specific implementation, the machining accuracy of valve core 10 and valve sleeve 20 is as follows: the surface roughness of the guide body 11 of valve core 10 is Rz0.4, and the cylindricity is 1 micrometer; the surface roughness of the inner hole of valve sleeve 20 is Rz0.9, and the cylindricity is 1 micrometer; the fitting clearance between the guide post 11 of valve core 10 and the guide through hole 21 of valve sleeve 20 is controlled at 6~9 micrometers, which effectively ensures the free sliding of valve core 10 and the working accuracy of valve core 10, prevents valve core 10 from jamming and sliding vibration, and reduces abnormalities such as uneven wear and wobble. The improvement of its roughness ensures the wear resistance of valve core 10 and valve sleeve 20 and improves the reliability of valve core 10. The sealing port 211 between the valve core 10 and the valve sleeve 20 is specifically a 120° conical sealing structure, which can effectively reduce wear caused by the seal.
[0014] In a specific embodiment, the electromagnetic coil 60 adopts a low hysteresis magnetic circuit structure with a dynamic response time of 4.3ms; The 22 oil inlet holes are arranged in a cross shape to stabilize the oil intake and reduce fuel pulsation interference.
[0015] An application of a PCV pressure control valve for a high-pressure oil pump, see [link / reference]. Figure 5 It includes a PCV pressure control valve 100, a common rail high-pressure oil pump 200, and a high-pressure oil pump outlet valve 300; the oil inlet channel 201 of the external common rail high-pressure oil pump 200 is connected to the mixing oil chamber 101 after the PVC pressure control valve 100 is installed, and the mixing oil chamber 101 is connected to the oil inlet port 22. The common rail high-pressure oil pump 200 has a damping limit block 80 at the bottom of the valve core 10 after installation. The damping limit block 80 has several damping holes 81 in the thickness direction. Below the damping limit block 80 is the plunger cavity 202. The output oil circuit of the plunger cavity 202 is connected to the high-pressure oil pump outlet valve 300.
[0016] Its working principle is as follows Figure 4 When oil enters the plunger chamber, the PCV pressure control valve 100 is in a non-energized closed state. High-pressure oil enters the mixing chamber 101 along the oil inlet channel 201, then enters the oil inlet hole 22, and then enters the open sealing valve port after passing through the flow avoidance ring groove 13. It then flows into the plunger chamber 202 through the damping hole 81, making the PCV pressure control valve 100 normally open for oil delivery and in the oil return state. After the electromagnetic coil 60 is energized, it attracts the armature 40 upward, thereby driving the valve core stop protrusion 12 to fit against the sealing valve port 211, closing the entire oil passage. This allows the fuel in the plunger chamber to be pressurized by the plunger and sent out through the high-pressure oil pump outlet valve 300. After that, the electromagnetic coil 60 is de-energized, the return spring 50 pushes the valve core 10 down, and the valve core stop protrusion 12 disengages from the sealing valve port 211, making the oil passage unobstructed and completing the oil return operation for the plunger chamber 202.
[0017] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.
[0018] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.
Claims
1. A high-pressure oil pump PCV pressure control valve, characterized in that, It includes: The valve core includes a guide post, and the bottom of the guide post is provided with a valve core stop protrusion and a flow avoidance ring groove from bottom to top. The valve sleeve includes a guide through hole located at the radial center, and a sealing valve port is provided at the bottom of the radial through hole. The sealing valve port cooperates with the valve core stop protrusion for closing operation. The lower outer ring surface of the valve sleeve is provided with a number of radially inwardly communicating oil inlets. The oil inlets are respectively connected to the guide through hole and are arranged towards the flow avoidance ring groove. The valve body includes a valve core guide cavity and several coil mounting cavities. The valve core guide cavity is located at the lower part of the radial center of the valve body, and the several coil mounting cavities are arranged in a ring around the valve body. armature; Return spring; And electromagnetic coils; The valve sleeve is fixedly installed in the lower end mounting cavity of the valve body. The lower part of the valve sleeve protrudes downward from the lower surface of the valve body. The guide post of the valve core is inserted into the guide through hole. After the valve sleeve is fixedly installed in the valve body, it forms an armature mounting cavity. The guide post of the valve core protrudes upward from the guide through hole and is fixedly installed with the armature. The top of the guide post of the valve core is located at the bottom of the valve core guide movable cavity. The return spring is placed in the valve core guide movable cavity, and the bottom of the return spring is pressed against the top of the guide post. Electromagnetic coils are arranged in the coil mounting cavity. When all the electromagnetic coils are energized, they attract the armature upward, thereby driving the valve core stop protrusion to fit against the sealing valve port and close the entire oil passage. When the electromagnetic coils are de-energized, the return spring pushes the valve core downward, and the valve core stop protrusion disengages from the sealing valve port, making the oil passage unobstructed.
2. The high-pressure oil pump PCV pressure control valve according to claim 1, characterized in that: The upper outer circumference of the valve sleeve is fastened to the lower internal thread of the valve body by a thread, and a retaining ring is provided between the outer shaft of the upper surface of the valve sleeve and the lower surface of the corresponding body of the valve body.
3. The high-pressure oil pump PCV pressure control valve according to claim 1, characterized in that: The upper surface of the valve sleeve is provided with a clearance groove corresponding to the lower region of the armature.
4. The high-pressure oil pump PCV pressure control valve according to claim 3, characterized in that: The flow clearance groove, when in the closed or open position, completely covers the height of the oil inlet hole of the annular fabric.
5. The high-pressure oil pump PCV pressure control valve according to claim 1, characterized in that: The valve core and valve sleeve are precision machined. The surface roughness of the guide body of the valve core is Rz0.4 and the cylindricity is 1 micrometer. The surface roughness of the inner hole of the valve sleeve is Rz0.9 and the cylindricity is 1 micrometer. The fitting clearance between the guide column of the valve core and the guide through hole of the valve sleeve is controlled at 6-9 micrometers.
6. The high-pressure oil pump PCV pressure control valve according to claim 1, characterized in that: The valve core and valve sleeve sealing port is specifically a 120° conical sealing structure.
7. The high-pressure oil pump PCV pressure control valve according to claim 1, characterized in that: The electromagnetic coil adopts a low-hysteresis magnetic circuit structure.
8. The high-pressure oil pump PCV pressure control valve according to claim 1, characterized in that: The oil inlet holes are arranged to form a cross-shaped oil inlet.
9. An application of a PCV pressure control valve for a high-pressure oil pump, characterized in that: It includes a PCV pressure control valve, a common rail high-pressure oil pump, and a high-pressure oil pump outlet valve as described in any one of claims 1-8; the oil inlet channel of the external common rail high-pressure oil pump is connected to the mixing oil chamber after the PVC pressure control valve is installed, and the mixing oil chamber is connected to the oil inlet.
10. The application of the PCV pressure control valve for a high-pressure oil pump according to claim 9, characterized in that: The common rail high-pressure oil pump has a damping limit block at the bottom of the valve core after installation. The damping limit block has several damping holes in the thickness direction. Below the damping limit block is a plunger cavity, and the output oil circuit of the plunger cavity is connected to the high-pressure oil pump outlet valve.