Automobile vacuum pump

Abstract

The invention belongs to the technical field of vacuum pumps, and particularly relates to an automobile vacuum pump. The problem that lubrication of an existing automobile vacuum pump is interrupted due to blockage of a filter screen is solved. The automobile vacuum pump comprises a pump body and a rotor, the rotor is connected with blades in a sliding mode, a pump cavity is formed in the pump body, the blades are matched with the pump cavity in a sealing and rotating mode, an oil inlet hole communicated with the pump cavity is further formed in the pump body, and a fixing base, an oil inlet base and an elastic element are sequentially arranged in the oil inlet hole from outside to inside in the radial direction. The oil inlet base abuts against the fixing base through an elastic element, an oil passing hole is formed in the fixing base, a filtering piece is fixedly connected to the oil inlet base, a first oil inlet channel communicated with a filtering hole in the filtering piece is formed in the oil inlet base, the filtering piece covers the oil passing hole, and a second oil inlet channel is formed between the outer circumferential face of the oil inlet base and the inner hole wall of the oil inlet hole. And the second oil inlet channel bypasses the filtering piece and is communicated with the oil passing hole. The lubricating oil has the advantages of high lubricating reliability, good safety and the like.

Description

Technical Field

[0001] This invention relates to the field of vacuum pump technology, specifically to an automotive vacuum pump. Background Technology

[0002] Automotive vacuum pumps are widely used to provide a vacuum source for vehicle braking systems and other auxiliary devices. A typical automotive vacuum pump usually consists of a housing, a rotor, and blades slidably mounted on the rotor, which is driven by the engine camshaft or other drive components via a coupling. To ensure reliable operation of the vacuum pump and its drive coupling, lubrication of moving parts is usually required, especially of the mating surfaces between the rotor and the drive components, to prevent excessive wear and premature failure.

[0003] In existing technology, engine lubricating oil is introduced through an oil inlet on the pump housing and delivered to the parts requiring lubrication via internal oil passages. To prevent impurities in the lubricating oil from entering the pump body and causing wear or jamming, a filter screen or filter element is usually installed at the oil inlet to intercept particulate contaminants. However, in actual use, as the vehicle runs over time and is not cleaned in a timely manner, impurities gradually accumulate on the filter screen surface, causing blockage. Once the filter screen is blocked, the lubricating oil flow is significantly reduced or even interrupted, causing the connecting device and internal moving parts of the pump to operate in a state of insufficient oil, thereby causing rapid abnormal wear, jamming, or even pump damage. Especially during driving, if lubrication is suddenly interrupted due to filter screen blockage, it may cause the vacuum pump to fail rapidly, leading to serious safety hazards such as loss of brake assist.

[0004] In existing technologies, such as the automotive vacuum pump disclosed in patent document CN103857916B, although an independent lubrication pipeline supplies lubricating fluid to the connecting device, the inlet of its lubrication flow path still relies on filter elements such as filters, failing to effectively solve the risk of blockage caused by the accumulation of impurities. Therefore, how to ensure lubrication reliability while avoiding lubrication failure caused by filter blockage has become a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the purpose of this invention is to provide an automotive vacuum pump.

[0006] The objective of this invention can be achieved through the following technical solution: an automotive vacuum pump, comprising a pump body and a rotor, wherein blades are slidably connected to the rotor, a pump cavity is formed on the pump body, the blades are sealed and rotatably engaged with the pump cavity, and an oil inlet hole communicating with the pump cavity is also provided on the pump body. A fixed seat, an oil inlet base, and an elastic element are arranged radially from the outside to the inside of the oil inlet hole. The oil inlet base abuts against the fixed seat through the elastic element. An oil passage hole is provided on the fixed seat. A filter element is fixedly connected to the oil inlet base. A first oil inlet channel communicating with the filter hole on the filter element is provided in the oil inlet base. The filter element covers the oil passage hole. A second oil inlet channel is formed between the outer peripheral surface of the oil inlet base and the inner wall of the oil inlet hole. The second oil inlet channel bypasses the filter element and communicates with the oil passage hole.

[0007] This solution incorporates a combined valve body consisting of a fixed seat, an oil inlet seat, and an elastic element within the oil inlet port. Two parallel oil inlet channels are established: a first inlet channel and a second inlet channel. The first inlet channel connects directly to the oil inlet port via a filter element, while the second inlet channel bypasses the filter element before connecting directly to the oil inlet port. This means that when the oil inlet port becomes clogged, the oil pressure is transmitted to the filter element, causing it to move the oil inlet seat away from the fixed seat. The second inlet channel then bypasses the filter element and connects directly to the oil inlet port, achieving redundant lubricant supply. Under normal operating conditions, the lubricating oil primarily flows through the filter element for purification. When the filter element becomes clogged, the balance between oil pressure and the elastic element at the oil inlet seat is disrupted, causing the filter element to separate from the fixed seat. The second inlet channel opens, allowing lubricating oil to bypass the clogged filter element and enter directly, ensuring continuous lubrication. This fundamentally solves the problem of lubrication interruption caused by filter clogging, significantly improving the operational reliability and safety of the vacuum pump.

[0008] Furthermore, the side wall of the oil inlet seat is provided with at least two radially penetrating connecting holes, which are always connected to the first oil inlet channel and the second oil inlet channel. The radially penetrating connecting holes always connect the first oil inlet channel and the second oil inlet channel. Even under normal filtration conditions, oil slides in the second oil inlet channel, maintaining communication with the first oil inlet channel, forming a pressure balance structure. This helps ensure that the pressure difference across the oil inlet seat can sensitively reflect the degree of clogging of the filter element, allowing the elastic element to more accurately control the opening timing of the bypass oil channel, avoiding false opening or delayed opening due to inaccurate pressure difference calculations.

[0009] Furthermore, a fixing groove is provided at one end of the oil inlet seat near the fixing seat, and the filter element is fixed in the fixing groove.

[0010] Furthermore, the oil inlet seat includes a first cylinder and a second cylinder with successively decreasing outer circumferential diameters. A second oil inlet channel is formed between the outer circumferential surface of the first cylinder and the inner wall of the oil inlet hole. The connecting hole is located on the side wall of the first cylinder.

[0011] This design uses a first cylinder and a second cylinder with different diameters for the oil inlet seat. The gap between the first cylinder and the inner wall of the oil inlet hole directly forms a bypass oil passage, resulting in a simple structure that is easy to manufacture. The second cylinder, with its smaller diameter, is used to accommodate the elastic element and guide its compression direction, ensuring that the oil inlet seat can move stably along the axis under the action of the elastic element. This provides a structural basis for the reliable opening and closing of the bypass oil passage.

[0012] Furthermore, at least two oil replenishment holes are axially penetrating the side wall of the first cylinder, and the openings of these holes are covered and abutted by the lower end face of the fixing seat. This design adds axially penetrating oil replenishment holes to the side wall of the first cylinder, and their openings are covered by the lower end face of the fixing seat. These oil replenishment holes are only exposed when the filter element is severely clogged and the oil inlet seat moves, providing an additional entry channel for lubricating oil.

[0013] Furthermore, the oil inlet includes a main oil inlet and a branch oil inlet. The fixed seat, the oil inlet seat, and the elastic element are sequentially arranged in the main oil inlet. The two ends of the elastic element abut against one end of the oil inlet seat and the bottom wall of the main oil inlet, respectively.

[0014] Furthermore, the pump body is provided with a rotating hole that communicates with the pump cavity, the rotor rotates in cooperation with the rotating hole, and the branch oil hole extends obliquely upward from the bottom of the main oil hole to the rotating hole.

[0015] In this design, the oil support hole extends obliquely upwards from the bottom of the main oil hole to the rotating hole where the rotor is located. Oil pressure guides the lubricating oil to the critical rotating friction pairs, ensuring that the lubricating oil is accurately delivered to the mating surfaces of the rotor and pump body that require lubrication, thus achieving precise lubrication of key moving parts.

[0016] Furthermore, an oil inlet groove is provided at the opening of the rotating hole relative to the oil support hole, and the oil inlet groove extends axially into the pump cavity. In this design, the oil inlet groove serves to collect and distribute oil evenly. It can collect and store a portion of the lubricating oil flowing from the oil support hole, forming an oil pool. Then, through the axially extending groove, the lubricating oil is evenly guided to the entire mating surface between the rotor and the rotating hole, as well as the mating surface with the pump cavity, expanding the lubrication range and improving the lubrication effect, especially for the end face lubrication between the rotor and the pump body.

[0017] Furthermore, the rotor includes a first rotating part and a second rotating part. The outer circumferential diameter of the second rotating part is larger than that of the first rotating part. The first rotating part rotatably engages with and abuts against the rotating hole. The upper end face of the second rotating part abuts against and rotatably engages with the connecting surface of the pump cavity and the rotating hole. The upper end face of the second rotating part covers the oil inlet groove and the rotating hole. This solution, by setting a second rotating part with a larger diameter, allows its end face to abut against and cover the connecting surface of the pump cavity and the rotating hole, thus forming a dynamic end-face sealing and lubrication structure. When the rotor rotates, its end face forms a friction pair with the pump body end face. After the second rotating part covers the oil inlet groove, it forms a friction pair with the pump cavity, which can better utilize the oil in the oil inlet groove, forming a stable oil film, preventing the lubricating oil from flowing out too quickly, and significantly improving the lubrication efficiency and wear resistance of the end-face friction pair.

[0018] Furthermore, a sliding groove is provided inside the second rotating part, and the blade is slidably disposed in the sliding groove.

[0019] Compared with existing technologies, the technical advantages of this invention are as follows: This invention systematically solves the lubrication failure problem caused by filter element blockage in existing automotive vacuum pumps through a redundant lubrication supply structure. Its core technical solution lies in constructing an automatic bypass valve based on pressure difference, achieving dual-mode lubrication for normal operation (filtration) and bypass operation (bypass). Based on this, through refined design of the oil circuit layout, valve body structure, rotor shape, and lubrication grooves, a complete lubrication guarantee chain is formed, from inlet filtration, bypass protection, precise delivery, surface uniform distribution to dynamic film formation. This solution not only ensures the lubrication reliability of the vacuum pump under harsh operating conditions, avoiding catastrophic failure due to insufficient oil, but also improves lubrication efficiency and wear resistance of key friction pairs through structural optimization, thereby significantly improving the overall safety, reliability, and service life of the vacuum pump. Attached Figure Description

[0020] Figure 1 This is a three-dimensional view of the pump body after a partial section is performed according to the present invention.

[0021] Figure 2 This is an overall sectional view of the present invention.

[0022] Figure 3 This is an enlarged view of point A in the present invention.

[0023] Figure 4 This is a partial cross-sectional view of the present invention.

[0024] Figure 5 This is a perspective view of the present invention.

[0025] Drawing number markings: 1. Pump body; 2. Rotor; 3. Blade; 4. Oil inlet hole; 5. Fixed base; 6. Oil inlet seat; 7. Elastic element; 8. Filter element; 21. First rotating part; 22. Second rotating part; 23. Sliding groove; 41. Main oil hole; 42. Support oil hole; 51. Through oil hole; 61. First oil inlet channel; 62. Second oil inlet channel; 63. Connecting hole; 64. First cylinder; 65. Second cylinder; 66. Fixed groove; 67. Oil replenishment hole; 81. Filter hole; 101. Pump chamber; 102. Rotating hole; 103. Oil inlet groove. Detailed Implementation

[0026] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0027] It should be noted that the descriptions of directions such as "upper", "lower", "left", "right", "top", and "bottom" in this invention are defined based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device must be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0028] according to Figures 1 to 5 As shown, this invention provides an automotive vacuum pump, comprising a pump body 1 and a rotor 2. Blades 3 are slidably connected to the rotor 2. The pump body 1 has a pump cavity 101 formed therein, along with an air inlet and an air outlet communicating with the pump cavity 101. The blades 3 are in a sealed rotational fit with the pump cavity 101, thereby achieving the pumping function under the drive of the rotor 2. The pump body 1 also has an oil inlet 4 communicating with the pump cavity 101 for introducing engine lubricating oil to lubricate the internal moving parts.

[0029] The core improvement of this invention lies in the internal structure of the oil inlet hole 4. Specifically, the oil inlet hole 4 has a radial structure extending from the outside to the inside (i.e., from...). Figure 2 The pump body 1 (from the outside to the inside) is provided with a fixed seat 5, an oil inlet seat 6, and an elastic element 7 in sequence. In this embodiment, the elastic element 7 is preferably a helical compression spring with a certain preload. The oil inlet seat 6 abuts against the fixed seat 5 through the elastic element 7, that is, the elastic element 7 presses the oil inlet seat 6 against the fixed seat 5.

[0030] The fixed base 5 is generally annular or cylindrical in shape, with an oil passage 51 at its center for connecting to the external oil passage of the pump body 1. A filter element 8 is fixedly connected to the oil inlet base 6. The filter element 8 can be a high-precision metal mesh or filter cloth, used to intercept impurities in the lubricating oil. A first oil inlet channel 61 is provided inside the oil inlet base 6, which communicates with the filter hole 81 on the filter element 8. In the initial assembly state, the filter element 8 covers the oil passage 51 on the fixed base 5, so that the lubricating oil introduced from the outside must pass sequentially through the oil hole 51, the filter hole 81 on the filter element 8, and the first oil inlet channel 61 before entering the pump body 1.

[0031] Furthermore, a second oil inlet channel 62 is formed between the outer peripheral surface of the oil inlet seat 6 and the inner wall of the oil inlet hole 4. This second oil inlet channel 62 bypasses the filter element 8 and connects to the oil passage hole 51. The second oil inlet channel 62 can be understood as a bypass oil passage that bypasses the filter element 8. Under normal operating conditions, the filter element 8 is not blocked, and the resistance of the lubricating oil flowing through the filter element 8 is small. Under the action of the thrust of the elastic element 7 and the oil pressure, the oil inlet seat 6 remains in a state of contact with the fixed seat 5. At this time, the oil in the second oil inlet channel 62 can flow from the first oil inlet channel 61, mainly playing a role in pressure balance. Most of the lubricating oil enters the pump body 1 through the first oil inlet channel 61, ensuring the cleanliness of the lubricating oil.

[0032] When the surface of the filter element 8 becomes clogged due to the accumulation of impurities from prolonged use, the resistance to the flow of lubricating oil through the filter element 8 increases dramatically, causing a significant rise in oil pressure on the side of the oil inlet seat 6 near the fixed seat 5. This pressure acts on the oil inlet seat 6 and the filter element 8, creating a thrust that overcomes the elastic force of the elastic element 7. When this thrust exceeds the preload of the elastic element 7, the oil inlet seat 6 will move away from the fixed seat 5, overcoming the elastic force of the elastic element 7. At this time, a gap appears between the oil inlet seat 6 and the fixed seat 5, and the second oil inlet passage 62 is fully opened, forming a low-resistance bypass oil path. Lubricating oil can directly enter the pump body 1 from the oil passage 51 through the second oil inlet passage 62, bypassing the clogged filter element 8, ensuring a continuous supply of lubricating oil.

[0033] To optimize the sensitivity of pressure sensing and the response characteristics of the bypass oil path, at least two radially penetrating connecting holes 63 are provided on the side wall of the oil inlet seat 6. In this embodiment, there are two connecting holes 63, which are symmetrically arranged. The connecting holes 63 are always connected to the first oil inlet channel 61 and the second oil inlet channel 62. Under normal filtration conditions, the lubricating oil in the second oil inlet channel 62 can communicate with the oil in the first oil inlet channel 61 through the connecting holes 63, thereby forming a dynamic pressure balance system on both sides of the filter element 8. This allows the pressure difference between the two ends of the oil inlet seat 6 to accurately reflect the degree of blockage of the filter element 8, avoiding false opening or delayed opening caused by pressure fluctuations.

[0034] The oil inlet seat 6 includes a first cylinder 64 and a second cylinder 65 with successively decreasing outer diameters. The second oil inlet passage 62 is formed between the outer circumferential surface of the first cylinder 64 and the inner wall of the oil inlet hole 4. A connecting hole 63 is formed on the side wall of the first cylinder 64. The second cylinder 65 has a smaller diameter and is used to mount the elastic element 7. One end of the elastic element 7 is fitted onto and abuts against the second cylinder 65, while the other end abuts against the bottom wall of the oil inlet hole 4. This stepped shaft structure not only facilitates machining and assembly but also ensures that the oil inlet seat 6 moves stably along the axis under the action of the elastic element 7, guaranteeing the reliability of the opening and closing of the bypass oil passage.

[0035] At one end of the oil inlet seat 6 near the fixed seat 5, i.e. the end face of the first cylinder 64, a fixing groove 66 is provided, and the filter element 8 is embedded and fixed in the fixing groove 66.

[0036] As a further optimization, at least two oil replenishment holes 67 are axially penetrating the side wall of the first cylinder 64. In the initial state, the openings of the oil replenishment holes 67 are covered and sealed by the lower end face of the fixed seat 5. When the oil inlet seat 6 moves a certain distance due to blockage by the filter element 8, the openings of the oil replenishment holes 67 are exposed from below the fixed seat 5 and quickly connect with the oil passage 51. At this time, in addition to entering through the second oil inlet channel 62, lubricating oil can also directly enter the first oil inlet channel 61 through the oil replenishment holes 67, providing additional lubrication to the pump body 1 and further enhancing the oil supply capacity under extreme blockage conditions.

[0037] The oil inlet 4 inside the pump body 1 specifically includes a main oil inlet 41 and a branch oil inlet 42. A fixed base 5, an oil inlet seat 6, and an elastic element 7 are sequentially arranged inside the main oil inlet 41. The pump body 1 also has a rotating hole 102 communicating with the pump chamber 101, and the rotor 2 rotates in cooperation with this rotating hole 102. The branch oil inlet 42 extends obliquely upwards from the bottom of the main oil inlet 41 to the rotating hole 102, thereby precisely guiding the filtered or bypassed lubricating oil to the mating surface between the rotor 2 and the rotating hole 102.

[0038] An oil inlet groove 103 is provided at the opening of the rotating hole 102 relative to the oil support hole 42. The oil inlet groove 103 extends axially along the rotating hole 102 to the pump chamber 101. The oil inlet groove 103 serves two purposes: firstly, it acts as an oil reservoir, collecting the lubricating oil flowing out of the oil support hole 42 to form a local oil pool; secondly, its axially extending structure can uniformly guide the lubricating oil to the entire axial mating surface of the rotor 2 and further introduce it into the pump chamber 101 to lubricate the end face of the blades 3.

[0039] To cooperate with the aforementioned lubrication structure, the rotor 2 is designed to include a first rotating part 21 and a second rotating part 22. The outer diameter of the second rotating part 22 is larger than that of the first rotating part 21. The first rotating part 21 rotates and abuts against the rotating hole 102, forming radial support. The upper end face of the second rotating part 22 abuts against and rotates with the connecting surface of the pump chamber 101 and the rotating hole 102, forming an end face friction pair. Furthermore, the upper end face of the second rotating part 22 completely covers the oil inlet groove 103 and the port of the rotating hole 102. When the rotor 2 rotates, the lubricating oil in the oil inlet groove 103 forms a stable oil film on the contact surface between the first rotating part 21 and the rotating hole 102 and on the contact surface between the upper end face of the second rotating part 22 and the pump chamber 101, achieving dynamic sealing and efficient lubrication, and greatly improving the wear condition of the end face friction pair. A sliding groove 23 is provided inside the second rotating part 22, and the blade 3 is slidably disposed within the sliding groove 23.

[0040] In summary, during operation, the lubricating oil in this embodiment of the automotive vacuum pump enters through the oil passage 51 from the outside. When the filter element 8 is not clogged, most of the lubricating oil, after being purified by the filter element 8, sequentially passes through the first oil inlet channel 61, the connecting hole 63, the second oil inlet channel 62, the bottom of the main oil hole 41, the branch oil hole 42, and the oil inlet groove 103, finally entering the mating surface of the rotor 2, the rotating hole 102, and the pump chamber 101 to complete lubrication. When the filter element 8 is clogged, the oil pressure pushes the oil inlet seat 6 to compress the elastic element 7, causing the filter element 8 to separate from the fixed seat 5. The second oil inlet channel 62 is then fully opened, allowing the lubricating oil to bypass the clogged filter element 8 and directly enter the bottom of the main oil hole 41 through the second oil inlet channel 62, ensuring continuous lubrication. This invention, through this redundant lubrication supply structure, effectively avoids lubrication failure caused by filter element clogging, significantly improving the operational safety and reliability of the vacuum pump.

[0041] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. An automotive vacuum pump, comprising a pump body (1) and a rotor (2), wherein the rotor (2) is slidably connected with blades (3), and a pump cavity (101) is formed on the pump body (1), wherein the blades (3) are in a sealed rotational fit with the pump cavity (101), characterized in that: The pump body (1) is also provided with an oil inlet hole (4) communicating with the pump chamber (101). The oil inlet hole (4) is provided with a fixed seat (5), an oil inlet seat (6) and an elastic element (7) arranged radially from the outside to the inside. The oil inlet seat (6) abuts against the fixed seat (5) through the elastic element (7). An oil passage hole (51) is opened on the fixed seat (5). A filter element (8) is fixedly connected to the oil inlet seat (6). A first oil inlet channel (61) is opened in the oil inlet seat (6) and communicates with the filter hole (81) on the filter element (8). The filter element (8) covers the oil passage hole (51). A second oil inlet channel (62) is formed between the outer peripheral surface of the oil inlet seat (6) and the inner wall of the oil inlet hole (4). The second oil inlet channel (62) bypasses the filter element (8) and communicates with the oil passage hole (51).

2. The automotive vacuum pump according to claim 1, characterized in that: The oil inlet seat (6) has at least two radially penetrating connecting holes (63) on its side wall. The connecting holes (63) are always connected to the first oil inlet channel (61) and the second oil inlet channel (62).

3. The automotive vacuum pump according to claim 2, characterized in that: The oil inlet seat (6) is provided with a fixing groove (66) at one end near the fixing seat (5), and the filter element (8) is fixed in the fixing groove (66).

4. The automotive vacuum pump according to claim 3, characterized in that: The oil inlet seat (6) includes a first cylinder (64) and a second cylinder (65) with decreasing outer diameters. A second oil inlet channel (62) is formed between the outer circumferential surface of the first cylinder (64) and the inner wall of the oil inlet hole (4). The connecting hole (63) is located on the side wall of the first cylinder (64).

5. The automotive vacuum pump according to claim 4, characterized in that: At least two oil replenishing holes (67) are axially penetrating the side wall of the first cylinder (64), and the openings of the oil replenishing holes (67) are covered and abutted by the lower end face of the fixing seat (5).

6. A car vacuum pump according to any one of claims 1 to 5, characterized in that: The oil inlet (4) includes a main oil hole (41) and a branch oil hole (42). The fixed seat (5), the oil inlet seat (6) and the elastic element (7) are arranged in sequence in the main oil hole (41). The two ends of the elastic element (7) abut against one end of the oil inlet seat (6) and the bottom wall of the main oil hole (41).

7. The automotive vacuum pump according to claim 6, characterized in that: The pump body (1) is provided with a rotating hole (102) that communicates with the pump chamber (101). The rotor (2) rotates in cooperation with the rotating hole (102). The branch oil hole (42) extends obliquely upward from the bottom of the main oil hole (41) to the rotating hole (102).

8. The automotive vacuum pump according to claim 7, characterized in that: The rotating hole (102) is provided with an oil inlet groove (103) at the opening of the oil support hole (42), and the oil inlet groove (103) extends axially to the pump chamber (101).

9. A car vacuum pump according to claim 8, characterized in that: The rotor (2) includes a first rotating part (21) and a second rotating part (22). The outer diameter of the second rotating part (22) is larger than the outer diameter of the first rotating part (21). The first rotating part (21) rotates and abuts against the rotating hole (102). The upper end face of the second rotating part (22) abuts against and rotates with the connecting surface of the pump chamber (101) and the rotating hole (102). The upper end face of the second rotating part (22) covers the oil inlet groove (103) and the rotating hole (102).

10. An automotive vacuum pump according to claim 9, characterized in that: The second rotating part (22) is provided with a sliding groove (23), and the blade (3) is slidably disposed in the sliding groove (23).

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