A mid-mounted oil control valve

Abstract

The present invention provides a centrally mounted oil control valve, comprising a valve housing (2), a valve sleeve (4) and a valve core (7), an oil inlet passage (8) and a first oil discharge passage (10) are formed between the valve housing (2) and the valve sleeve (4), a valve core tail wing (71) is formed on the valve core (7), a differential pressure groove (12) is formed between the valve core tail wing (71) and the valve sleeve (4), a second oil discharge passage (11) is formed between the valve sleeve (4) and the valve core (7), and the first oil discharge passage (10) is communicated with the second oil discharge passage (11) and the differential pressure groove (12) respectively. When the valve core moves axially relative to the valve sleeve, the hydraulic thrust generated when the fluid is discharged and passes through the differential pressure groove will act on the valve core tail wing, and the hydraulic thrust is conducive to shortening the return time of the valve core. At the same time, the oil discharge cross-sectional area is increased through the second oil discharge passage, and the oil discharge throttling loss is reduced, which has the outstanding advantages of accelerating the return speed of the valve core and improving the oil discharge efficiency.

Description

Technical Field

[0001] The invention relates to the field of VVT oil control valve structure design, in particular to a centrally mounted oil control valve for an engine. Background Art

[0002] The camshaft phase adjuster is used to adjust the operation of the engine. It acts on the camshaft through the oil control valve to change the relative position of the camshaft with respect to the crankshaft, so that the opening and closing time of the ventilation valve can be moved to an earlier or later time in the cycle process.

[0003] The existing oil control valve for camshaft phase adjuster usually includes a valve housing, a valve sleeve and a valve core, wherein the valve housing has a threaded connection, a hollow section and a flange section, and a one-way valve is arranged at the bottom of the hollow section of the valve housing. When the one-way valve is opened, the fluid can enter the oil inlet of the valve sleeve through the one-way valve; the valve core is a cylindrical valve core and can move axially relative to the valve sleeve in the inner hole of the valve sleeve. When this oil control valve is working, the return speed of the valve core is slow, the oil discharge efficiency is low, and the oil discharge throttling loss is large. Summary of the invention

[0004] The technical problem to be solved by the present invention is: in view of the problems existing in the prior art, a centrally mounted oil control valve is provided to improve the oil discharge efficiency and the valve core return speed.

[0005] The technical problem to be solved by the present invention is achieved by adopting the following technical scheme: a centrally mounted oil control valve, comprising a valve housing, a valve sleeve and a valve core, an oil inlet passage and a first oil discharge passage are formed between the valve housing and the valve sleeve, a valve core tail wing is formed on the valve core, a differential pressure groove is formed between the valve core tail wing and the valve sleeve, a second oil discharge passage is formed between the valve sleeve and the valve core, and the first oil discharge passage is respectively communicated with the second oil discharge passage and the differential pressure groove.

[0006] Preferably, the valve core tail wing forms a valve core notch and a valve core tail wing notch edge at the tail end of the valve core respectively, and a differential pressure groove is formed between the valve core tail wing, the valve core tail wing notch edge and the valve sleeve inner hole.

[0007] Preferably, the opening formed between the edge of the notch of the valve core tail wing and the inner hole surface of the valve sleeve is the second oil discharge channel.

[0008] Preferably, a return spring is arranged between the valve sleeve and the valve core, a one-way valve is arranged between the valve sleeve and the valve housing, and one end of the one-way valve is sleeved with the return spring.

[0009] Preferably, the other end of the one-way valve is a one-way valve seat, a filter screen is arranged between the one-way valve seat and the valve housing, and the one-way valve seat is pressed against the peripheral edge of the filter screen.

[0010] Preferably, an annular oil groove is formed between the valve core and the valve sleeve, and the annular oil groove is communicated with the oil inlet passage.

[0011] Preferably, a first control oil passage and a second control oil passage are formed between the valve housing and the valve sleeve, respectively, and the oil inlet passage is staggeredly arranged at a certain angle to the first control oil passage and the second control oil passage.

[0012] Preferably, the oil inlet passage is a two-stage stepped structure formed by a first-stage oil inlet passage and a second-stage oil inlet passage, and the inner diameter of the first-stage oil inlet passage is greater than the inner diameter of the second-stage oil inlet passage.

[0013] Compared with the prior art, the present invention has the following beneficial effects: by forming a valve core tail wing on the valve core, a differential pressure groove between the valve core tail wing and the valve sleeve, and a second oil discharge passage between the valve sleeve and the valve core, when the valve core moves axially relative to the valve sleeve, the hydraulic thrust generated by the fluid located on the right side of the differential pressure groove when it is discharged and passes through the differential pressure groove will act on the valve core tail wing, and the hydraulic thrust is always conducive to the valve core returning to its initial position, shortening the return time of the valve core, thereby accelerating the return speed of the valve core, and at the same time, by setting the second oil discharge passage to increase the oil discharge cross-sectional area of ​​the central oil control valve, its oil discharge efficiency can be improved, and it can have a smaller oil discharge throttling loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The diagram is a schematic diagram of the structure of a center-mounted oil control valve of the present invention (reset spring reset state).

[0015] Figure 2 The figure is a schematic diagram of the structure of a center-mounted oil control valve of the present invention (the return spring is in a compressed state).

[0016] Figure 3 for Figure 1 or Figure 2 Cross-sectional view of the valve housing in FIG.

[0017] Figure 4 for Figure 1 or Figure 2 Front view of the valve sleeve in.

[0018] Figure 5 for Figure 1 or Figure 2 Cross-sectional view of the valve sleeve in FIG.

[0019] Figure 6 for Figure 1 or Figure 2 Cross-sectional view of the valve core in FIG.

[0020] Figure 7 for Figure 1 or Figure 2Side view of the valve core in.

[0021] Components marked in the figure: 1-filter, 2-valve housing, 3-check valve, 4-valve sleeve, 5-return spring, 6-retaining ring, 7-valve core, 8-oil inlet passage, 8a-first stage oil inlet passage, 8b-second stage oil inlet passage, 9-annular oil groove, 10-first oil discharge passage, 11-second oil discharge passage, 12-differential pressure groove, 13-first control oil passage, 14-second control oil passage, 21-valve inlet, 22-threaded connection part, 23-first outlet, 24-flange part, 25-second outlet, 26-first inlet and outlet, 27-second inlet and outlet, 28-first valve housing oil passage, 29-second valve housing oil passage, 31-check valve seat, 32-valve ball, 71-valve core tail wing, 72-valve core tail wing notch edge, 73-valve core notch. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0023] like Figure 1 , Figure 2 The centrally mounted oil control valve shown mainly comprises a valve housing 2, a valve sleeve 4 and a valve core 7. The valve housing 2 is a hollow cavity structure. A filter screen 1, a one-way valve 3, a valve sleeve 4 and a retaining ring 6 are arranged in the hollow inner cavity of the valve housing 2. The valve sleeve 4 is a hollow cavity structure. A valve core 7 is arranged in the hollow inner cavity of the valve sleeve 4. A reset spring 5 is arranged between the valve core 7 and the valve sleeve 4. A one-way valve 3 is arranged between the valve sleeve 4 and the valve housing 2. The one-way valve 3 comprises a one-way valve seat 31, a valve ball 32 and a spring. The valve ball 32 cooperates with the one-way valve seat 31 under the action of the spring to realize one-way flow control of the one-way valve 3. One end of the one-way valve 3 is sleeved with the reset spring 5. The other end of the one-way valve 3 is a one-way valve seat 31. A filter screen 1 is arranged between the one-way valve seat 31 and the valve housing 2. The one-way valve seat 31 is pressed against the peripheral edge of the filter screen 1. An annular oil groove 9 is formed between the valve core 7 and the valve sleeve 4, and the annular oil groove 9 can control the fluid path by the axial movement of the valve core 7 relative to the valve sleeve 4. The retaining ring 6 is fixedly installed at the rear end of the valve sleeve 4 and the valve core 7 to limit the axial movement limit of the valve sleeve 4 and the valve core 7.

[0024] like Figure 3As shown, the valve housing 2 is provided with a valve inlet 21, a first outlet 23, a second outlet 25, a first inlet and outlet 26, a second inlet and outlet 27, a first valve housing oil passage 28 and a second valve housing oil passage 29, respectively. The oil inlet end of the valve housing 2 is provided with a threaded connection part 22, and the oil discharge end of the valve housing 2 is provided with a flange part 24. The threaded connection part 22 is used to connect with the camshaft, and the flange part 24 fixes the phase adjuster together with the camshaft. Figure 6 , Figure 7 As shown, one or more valve core tail wings 71 are formed at the tail end of the valve core 7, and a valve core notch 73 and a valve core tail wing notch edge 72 are respectively formed at the tail end of the valve core 7 through the valve core tail wings 71. The valve core tail wings 71, the valve core tail wing notch edge 72 and the inner hole of the valve sleeve 4 together form a differential pressure groove 12, and the opening formed by the inner hole surface of the valve sleeve 4 and the valve core tail wing notch edge 72 is the second oil discharge passage 11. The oil inlet passage 8, the first oil discharge passage 10, the first control oil passage 13 and the second control oil passage 14 are respectively formed between the valve housing 2 and the valve sleeve 4. The first oil discharge passage 10 is communicated with the first outlet 23, the first control oil passage 13 is communicated with the second valve housing oil passage 29, and the second control oil passage 14 is communicated with the first valve housing oil passage 28, as shown in FIG. Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 shown.

[0025] The valve core 7 is usually driven by means of an electromagnetic actuator, which drives the valve core 7 to overcome the elastic force of the return spring 5, so that the valve core 7 moves axially relative to the valve sleeve 4. When the annular oil groove 9 is connected to the oil inlet passage 8 and the first control oil passage 13, the second control oil passage 14 is now connected to the first oil discharge passage 10 and the second oil discharge passage 11. When the annular oil groove 9 is connected to the oil inlet passage 8 and the second control oil passage 14, the first control oil passage 13 is now connected to the first oil discharge passage 10 and the second oil discharge passage 11. Therefore, by axially moving the valve core 7 relative to the valve sleeve 4, the annular oil groove 9 can guide the oil inlet passage 8 to be connected to the fluid of one of the two control oil passages, the first control oil passage 13 and the second control oil passage 14, and switch freely, so as to achieve precise control of the fluid. The fluid discharged from the second inlet and outlet 27 passes through the differential pressure groove 12 and is discharged jointly by the first oil discharge channel 10 and the second oil discharge channel 11. The fluid discharged from the first control oil channel 13 and the second control oil channel 14 passes through the hole in the valve core 7 and then passes through the differential pressure groove 12, and is finally discharged jointly by the first oil discharge channel 10 and the second oil discharge channel 11.

[0026] When the fluid passes through the differential pressure groove 12 and the second oil discharge passage 11 to reach the second outlet 25, due to the pressure difference between the fluid in the differential pressure groove 12 and the fluid at the second outlet 25, the hydraulic thrust generated by the fluid discharged from the first control oil passage 13 and the second control oil passage 14 (the fluid located on the right side of the differential pressure groove 12) when discharged and passing through the differential pressure groove 12 will act on the valve core tail 71, and the hydraulic thrust is always conducive to the valve core 7 returning to its initial position. Since the hydraulic thrust and the restoring force generated by the return spring 5 act on the valve core 7 together, the return time of the valve core 7 is shortened, so that the valve core 7 can return quickly, thereby increasing the return speed of the valve core 7. The hydraulic thrust generated by the fluid located on the right side of the differential pressure groove 12 acts on the valve core tail wing 71 to increase the return speed of the valve core 7. At the same time, since the second oil discharge channel 11 is compared with the first oil discharge channel 10, it can increase the oil discharge cross-sectional area of ​​the center-mounted oil control valve, thereby improving the oil discharge efficiency of the center-mounted oil control valve and making the center-mounted oil control valve have a smaller oil discharge throttling loss.

[0027] The oil inlet passage 8 on the valve sleeve 4 is preferably arranged at a certain angle to the first control oil passage 13 and the second control oil passage 14, and the oil inlet passage 8 can be designed as a two-stage step structure formed by a first-stage oil inlet passage 8a and a second-stage oil inlet passage 8b. The inner diameter of the first-stage oil inlet passage 8a is larger than the inner diameter of the second-stage oil inlet passage 8b. Figure 5 With such a structural design, the throttling area of ​​the oil inlet passage 8 can be effectively increased while satisfying the structural strength of the valve sleeve 4, so that the valve sleeve 4 has a smaller throttling loss.

[0028] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. It should be pointed out that any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A centrally mounted oil control valve, comprising a valve housing (2), a valve sleeve (4) and a valve core (7), wherein an oil inlet passage (8) and a first oil discharge passage (10) are formed between the valve housing (2) and the valve sleeve (4), characterized in that: A valve core tail wing (71) is formed on the valve core (7), a differential pressure groove (12) is formed between the valve core tail wing (71) and the valve sleeve (4), a second oil discharge passage (11) is formed between the valve sleeve (4) and the valve core (7), the first oil discharge passage (10) is communicated with the second oil discharge passage (11) and the differential pressure groove (12), the valve core tail wing (71) forms a valve core notch (73) and a valve core tail wing notch edge (72) at the rear end of the valve core (7), the valve core tail wing (71), the valve core tail wing notch edge (72) and the inner hole of the valve sleeve (4) together form a differential pressure groove (12), and the opening formed between the valve core tail wing notch edge (72) and the inner hole surface of the valve sleeve (4) is the second oil discharge passage (11).

2. The centrally mounted oil control valve according to claim 1, characterized in that: A return spring (5) is arranged between the valve sleeve (4) and the valve core (7), and a one-way valve (3) is arranged between the valve sleeve (4) and the valve housing (2), and one end of the one-way valve (3) is sleeved with the return spring (5).

3. The centrally mounted oil control valve according to claim 2, characterized in that: The other end of the one-way valve (3) is a one-way valve seat (31), and a filter screen (1) is arranged between the one-way valve seat (31) and the valve housing (2), and the one-way valve seat (31) is pressed against the peripheral edge of the filter screen (1).

4. The centrally mounted oil control valve according to claim 1, characterized in that: An annular oil groove (9) is formed between the valve core (7) and the valve sleeve (4), and the annular oil groove (9) is communicated with the oil inlet passage (8).

5. The centrally mounted oil control valve according to claim 1, characterized in that: A first control oil passage (13) and a second control oil passage (14) are respectively formed between the valve housing (2) and the valve sleeve (4), and the oil inlet passage (8) is arranged alternately with the first control oil passage (13) and the second control oil passage (14) at a certain angle to each other.

6. The centrally mounted oil control valve according to claim 1, characterized in that: The oil inlet passage (8) is a two-stage stepped structure formed by a first-stage oil inlet passage (8a) and a second-stage oil inlet passage (8b), and the inner diameter of the first-stage oil inlet passage (8a) is greater than the inner diameter of the second-stage oil inlet passage (8b).

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