A vane oil pump

Abstract

The present invention relates to a vane oil pump, in which a spring chamber is provided on the left side of the stator ring, and a control oil chamber is provided on the right side of the stator ring, and the control oil chamber is connected to the lubricating oil system of the engine; when the stator ring moves to the left, the amount of oil output per revolution of the vane oil pump decreases; when the speed of the vane oil pump increases and the pressure of the output oil increases, and the pressure in the control oil chamber increases, under the action of the oil pressure in the control oil chamber, the stator ring moves toward one end of the spring chamber and compresses the first compression spring, and when the pressure in the control oil chamber exceeds the set value, the stator ring compresses the first compression spring and the second compression spring at the same time. In the process in which the stator ring only compresses the first compression spring, the vane oil pump is in a low-pressure control mode, and in the process in which the stator ring compresses the first compression spring and the second compression spring at the same time, the vane oil pump is in a high-pressure control mode. It can be seen that the vane oil pump of the present invention can meet the secondary variable requirements of the oil pump, has low cost, and is reliable in operation.

Description

Technical Field

[0001] The invention relates to a vane oil pump, in particular to a vane oil pump used as an automobile engine oil pump. Background Art

[0002] The oil pump of a car engine is driven by the engine. As the engine speed increases, the speed of the oil pump also increases, and the output oil pressure becomes larger and larger. However, although the oil pressure required by the lubrication system of the car engine increases with the increase of the engine speed, it is not linearly related to the engine speed. The amount of oil required by the engine in different speed ranges is different. In order to make the engine speed adapt to the output oil pressure of the oil pump, the prior art generally performs two-stage control on the output oil volume of the engine oil pump. In order to achieve the requirements of two-stage variables, the traditional two-stage variable vane oil pump requires the coordinated work of the solenoid valve and the mechanical valve. This method is costly and not reliable enough. Summary of the invention

[0003] In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a vane oil pump that can meet the secondary variable requirements of the oil pump, has low cost and reliable operation.

[0004] To achieve the above-mentioned purpose, the present invention provides a vane oil pump, which adopts the following technical scheme: a vane oil pump, comprising a pump seat, a stator ring and a rotor, wherein the rotating shaft of the rotor is fixedly connected to the pump seat, and the rotor is located in an oil pressure chamber of the stator ring; the oil pressure chamber is connected to an oil suction port and an oil pressure port of the vane oil pump, and the oil pressure port is used to supply oil to the lubricating oil system of the engine;

[0005] The stator ring is slidably connected in the inner cavity of the pump seat, a spring cavity is provided on the left side of the stator ring, and a control oil cavity is provided on the right side of the stator ring, and the control oil cavity is communicated with the lubricating oil system of the engine; a first compression spring and a second compression spring which are sleeved together are provided in the spring cavity, the right end of the first compression spring abuts against the stator ring, and the left end of the first compression spring abuts against the inner wall of the spring cavity; the first compression spring is longer than the second compression spring;

[0006] When the stator ring moves to the left, the amount of oil output per revolution of the vane oil pump decreases; when the speed of the vane oil pump increases and the pressure of the output oil increases, causing the pressure in the control oil chamber to increase, under the action of the oil pressure in the control oil chamber, the stator ring moves toward one end of the spring chamber and compresses the first compression spring; when the pressure in the control oil chamber exceeds a set value, the stator ring compresses the first compression spring and the second compression spring at the same time.

[0007] Preferably, the stator ring has a first sliding connection portion and a second sliding connection portion, the first sliding connection portion is slidingly connected in the control oil chamber, the second sliding connection portion is slidingly connected in the spring chamber, and the first sliding connection portion seals the mouth of the control oil chamber.

[0008] Preferably, the first compression spring is sleeved on the outside of the second compression spring.

[0009] Preferably, a spring seat is connected to the inner wall of the spring cavity, and the spring seat has a connecting cavity. The second compression spring is sleeved on the outside of a guide rod, and the left and right ends of the guide rod respectively have a first connecting head and a second connecting head. The first connecting head is located in the connecting cavity, the right end of the second compression spring is against the second connecting head, and the left end of the second compression spring is against the spring seat; under the action of the second compression spring, the first connecting head is pressed against the inner wall of the connecting cavity.

[0010] More preferably, when the stator ring moves toward the spring cavity, the stator ring compresses the first compression spring to a certain length before contacting the second connector to compress the second compression spring.

[0011] More preferably, there is a gap between the first connecting head and the left side wall of the connecting cavity.

[0012] Preferably, the oil suction port and the oil pressure port are arranged on the pump seat.

[0013] As described above, the vane oil pump of the present invention has the following beneficial effects: in the vane oil pump of the present invention, since a spring chamber is provided on the left side of the stator ring and a control oil chamber is provided on the right side of the stator ring, the control oil chamber is connected to the lubricating oil system of the engine; when the stator ring moves to the left, the output oil volume per revolution of the vane oil pump decreases; when the speed of the vane oil pump increases and the pressure of the output oil increases, and the pressure in the control oil chamber increases, under the action of the oil pressure in the control oil chamber, the stator ring moves toward one end of the spring chamber and compresses the first compression spring, and when the pressure in the control oil chamber exceeds the set value, the stator ring compresses the first compression spring and the second compression spring at the same time. In the process that the stator ring only compresses the first compression spring, the vane oil pump is in a low-pressure control mode, and in the process that the stator ring compresses the first compression spring and the second compression spring at the same time, the vane oil pump is in a high-pressure control mode. It can be seen that the vane oil pump of the present invention can realize the secondary variable requirements of the oil pump, has low cost, and is reliable in operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Shown is a schematic structural diagram of a vane oil pump of the present invention.

[0015] Figure 2 Shown is a schematic diagram of the connection between the first compression spring, the second compression spring, the spring seat and the guide rod.

[0016] Figure 3Displayed are the engine's oil pressure requirements, the flow curve of a traditional oil pump, and a schematic diagram of the flow curve of a two-stage variable pump.

[0017] Component number description

[0018] 1 Pump seat

[0019] 2 Stator ring

[0020] 3 Rotor

[0021] 4 Oil pressure chamber

[0022] 5 Oil suction port

[0023] 6 Oil pressure port

[0024] 7 Spring chamber

[0025] 8 Control oil chamber

[0026] 9 First compression spring

[0027] 10 Second compression spring

[0028] 11 First sliding connection part

[0029] 12 Second sliding connection part

[0030] 13 Spring seat

[0031] 14 Connection cavity

[0032] 15 Guide rod

[0033] 16 First connector

[0034] 17 Second connector DETAILED DESCRIPTION

[0035] The following is a description of the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0036] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0037] like Figure 1 and Figure 2 As shown, the present invention provides a vane oil pump, comprising a pump seat 1, a stator ring 2 and a rotor 3, wherein the rotating shaft of the rotor 3 is fixedly connected to the pump seat 1, and the rotor 3 is located in an oil pressure chamber 4 of the stator ring 2; the oil pressure chamber 4 is connected to an oil suction port 5 and an oil pressure port 6 of the vane oil pump, and the oil pressure port 6 is used to supply oil to the lubricating oil system of the engine;

[0038] The stator ring 2 is slidably connected in the inner cavity of the pump seat 1. A spring cavity 7 is provided on the left side of the stator ring 2, and a control oil cavity 8 is provided on the right side of the stator ring 2. The control oil cavity 8 is communicated with the lubricating oil system of the engine; a first compression spring 9 and a second compression spring 10 are sleeved together in the spring cavity 7, the right end of the first compression spring 9 abuts against the stator ring 2, and the left end of the first compression spring 9 abuts against the inner wall of the spring cavity 7; the first compression spring 9 is longer than the second compression spring 10;

[0039] When the stator ring 2 moves to the left, the amount of oil output per revolution of the vane oil pump decreases; when the speed of the vane oil pump increases and the pressure of the output oil increases, thereby increasing the pressure in the control oil chamber 8, under the action of the oil pressure in the control oil chamber 8, the stator ring 2 moves toward one end of the spring chamber 7 and compresses the first compression spring 9. When the pressure in the control oil chamber 8 exceeds the set value, the stator ring 2 compresses the first compression spring 9 and the second compression spring 10 at the same time.

[0040] In a vane oil pump of the present invention, since a spring chamber 7 is provided on the left side of the stator ring 2 and a control oil chamber 8 is provided on the right side of the stator ring 2, the control oil chamber 8 is connected to the lubricating oil system of the engine; when the stator ring 2 moves to the left, the output oil volume per revolution of the vane oil pump decreases; when the speed of the vane oil pump increases and the pressure of the output oil increases, and the pressure in the control oil chamber 8 increases, under the action of the oil pressure in the control oil chamber 8, the stator ring 2 moves toward one end of the spring chamber 7 and compresses the first compression spring 9, and when the pressure in the control oil chamber 8 exceeds the set value, the stator ring 2 compresses the first compression spring 9 and the second compression spring 10 at the same time. In the process that the stator ring 2 only compresses the first compression spring 9, the vane oil pump is in a low-pressure control mode, and in the process that the stator ring 2 compresses the first compression spring 9 and the second compression spring 10 at the same time, the vane oil pump is in a high-pressure control mode. It can be seen that a vane oil pump of the present invention can realize the secondary variable requirements of the oil pump, has low cost, and works reliably.

[0041] In a vane oil pump of the present invention, the axial position of the rotor 3 of the vane pump remains fixed, and the pressure oil in the control oil chamber 8 and the spring in the spring chamber 7 can control the position of the stator ring 2. When the stator ring 2 moves to the left, the displacement per revolution of the oil pump decreases, and when the stator ring 2 moves to the right, the displacement per revolution of the oil pump increases. In the technical solution of the present invention, as the speed of the engine increases, the speed of the oil pump increases, and when the speed of the oil pump increases so that the pressure in the control oil chamber 8 increases, the stator ring 2 moves to the left again so that the displacement per revolution of the oil pump decreases, thereby reducing the flow growth rate of the oil pump.

[0042] In order to facilitate the sliding of the stator ring 2 in the inner cavity of the pump seat 1, Figure 2 As shown, the stator ring 2 has a first sliding connection portion 11 and a second sliding connection portion 12, wherein the first sliding connection portion 11 is slidably connected in the control oil chamber 8, and the second sliding connection portion 12 is slidably connected in the spring chamber 7, and the first sliding connection portion 11 seals the mouth of the control oil chamber 8. The sliding surface of the control oil chamber 8 and the first sliding connection portion 11 is parallel to the sliding surface of the spring chamber 7 and the second sliding connection portion 12.

[0043] like Figure 2As shown, a spring seat 13 is connected to the inner wall of the spring cavity 7, and the spring seat 13 has a connecting cavity 14. The second compression spring 10 is sleeved on the outside of a guide rod 15, and the left and right ends of the guide rod 15 respectively have a first connector 16 and a second connector 17. The first connector 16 is located in the connecting cavity 14, and the right end of the second compression spring 10 is against the second connector 17, and the left end of the second compression spring 10 is against the spring seat 13; under the action of the second compression spring 10, the first connector 16 is pressed against the inner wall of the connecting cavity 14, so that the second compression spring 10 has a certain preload. The first compression spring 9 and the second compression spring 10 are located between the spring seat 13 and the stator ring 2, and the first compression spring 9 and the second compression spring 10 are located in the spring cavity 7. In the initial state, the first compression spring 9 contacts the stator ring 2, and there is a certain gap between the second compression spring 10 and the stator ring 2. Therefore, when the stator ring 2 moves toward the spring cavity 7, only the first compression spring 9 is compressed at the beginning, and after the first compression spring 9 is compressed to a certain length, the first compression spring 9 and the second compression spring 10 are compressed simultaneously. As a preferred embodiment, Figure 2 As shown, the first compression spring 9 is sleeved on the outside of the second compression spring 10. In the initial state, there is a certain gap between the second connector 17 and the stator ring 2. When the stator ring 2 moves toward the spring cavity 7, the stator ring 2 compresses the first compression spring 9 to a certain length before contacting with the second connector 17 to compress the second compression spring 10. As a preferred embodiment, Figure 2 As shown, there is a gap between the first connecting head 16 and the left side wall of the connecting cavity 14 .

[0044] A vane oil pump of the present invention is installed on the engine, and the control oil chamber 8 is connected to the oil circuit of the engine lubrication system, so that the displacement of the oil pump can be closed-loop controlled by the oil pressure of the engine lubrication system, thereby achieving the purpose of controlling the amount of oil output by the oil pump.

[0045] When the engine is running, as the engine speed increases, the oil pump speed also increases accordingly, and the flow rate and oil pressure also increase. When the force generated by the engine oil pressure acting on the control oil chamber 8 is greater than the spring force in the outer spring chamber 7, the oil pressure pushes the control ring to move, thereby reducing the displacement of the oil pump, and the oil pump enters the low-pressure variable mode. As the speed continues to increase, the displacement of the stator ring 2 increases. When it contacts the guide rod 15, the stator ring 2 will be simultaneously subjected to the forces of the first compression spring 9 and the second compression spring 10. At this time, the force generated by the engine oil pressure needs to be greater than the combined force of the first compression spring 9 and the second compression spring 10 to make the stator ring 2 continue to move, and the oil pump enters the high-pressure variable mode.

[0046] like Figure 3The diagram shows the oil pressure requirement of the engine and the flow curve of the traditional oil pump and the flow curve of the two-stage variable pump. The arc curve OS in the figure shows the relationship between the oil flow required by the lubrication system of the automobile engine and the engine speed; the broken line OG in the figure shows the relationship between the flow of the traditional quantitative oil pump and the engine speed; ODEFS in the figure shows the relationship between the flow of a vane oil pump of the present invention and the engine speed, A in the figure shows the flow saved in the stage where only the first compression spring 9 is compressed (low pressure mode), and B in the figure shows the flow saved in the stage where both the first compression spring 9 and the second compression spring 10 are compressed (high pressure mode).

[0047] Based on the technical solutions of the above embodiments, a vane oil pump of the present invention can realize the secondary variable demand of the oil pump to save oil flow, reduce energy consumption, and has a simple structure and low cost.

[0048] In summary, the present invention effectively overcomes various shortcomings of the prior art and has high industrial utilization value.

[0049] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A vane oil pump, characterized in that: It includes a pump seat, a stator ring and a rotor, wherein the rotating shaft of the rotor is fixedly connected to the pump seat, and the rotor is located in the oil pressure chamber of the stator ring; the oil pressure chamber is connected to the oil suction port and the oil pressure port of the vane oil pump, and the oil pressure port is used to supply oil to the lubricating oil system of the engine; The stator ring is slidably connected in the inner cavity of the pump seat, a spring cavity is provided on the left side of the stator ring, and a control oil cavity is provided on the right side of the stator ring, and the control oil cavity is communicated with the lubricating oil system of the engine; a first compression spring and a second compression spring which are sleeved together are provided in the spring cavity, the right end of the first compression spring abuts against the stator ring, and the left end of the first compression spring abuts against the inner wall of the spring cavity; the first compression spring is longer than the second compression spring; A spring seat is connected to the inner wall of the spring cavity, and the spring seat has a connecting cavity. The second compression spring is sleeved on the outer side of a guide rod. The left and right ends of the guide rod respectively have a first connector and a second connector. The first connector is located in the connecting cavity. There is a certain gap between the second connector and the stator ring. The right end of the second compression spring abuts against the second connector, and the left end of the second compression spring abuts against the spring seat. Under the action of the second compression spring, the first connector is pressed against the inner wall of the connecting cavity. When the stator ring moves toward the spring cavity, the stator ring compresses the first compression spring to a certain length before contacting with the second connector to compress the second compression spring. When the stator ring moves to the left, the amount of oil output per revolution of the vane oil pump decreases; when the speed of the vane oil pump increases and the pressure of the output oil increases, causing the pressure in the control oil chamber to increase, under the action of the oil pressure in the control oil chamber, the stator ring moves toward one end of the spring chamber and compresses the first compression spring; when the pressure in the control oil chamber exceeds a set value, the stator ring compresses the first compression spring and the second compression spring at the same time.

2. The vane oil pump according to claim 1, characterized in that: The stator ring has a first sliding connection portion and a second sliding connection portion, wherein the first sliding connection portion is slidingly connected in the control oil chamber, the second sliding connection portion is slidingly connected in the spring chamber, and the first sliding connection portion seals the mouth of the control oil chamber.

3. The vane oil pump according to claim 1, characterized in that: The first compression spring is sleeved on the outside of the second compression spring.

4. The vane oil pump according to claim 1, characterized in that: There is a gap between the first connecting head and the left side wall of the connecting cavity.

5. The vane oil pump according to claim 1, characterized in that: The oil suction port and the oil pressure port are arranged on the pump seat.

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