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CN-122014618-A - Automobile vacuum pump

CN122014618ACN 122014618 ACN122014618 ACN 122014618ACN-122014618-A

Abstract

The invention belongs to the technical field of vacuum pumps, and particularly relates to an automobile vacuum pump. The invention solves the problem of lubrication interruption caused by the blockage of the filter screen of the existing automobile vacuum pump. The automobile vacuum pump comprises a pump body and a rotor, wherein the rotor is slidably connected with a blade, a pump cavity is formed in the pump body, the blade is in sealing running fit with the pump cavity, an oil inlet communicated with the pump cavity is further formed in the pump body, a fixing seat, an oil inlet seat and an elastic element are sequentially arranged in the oil inlet hole from outside to inside along the radial direction, the oil inlet seat abuts against the fixing seat through the elastic element, an oil passing hole is formed in the fixing seat, a filter element is fixedly connected to the oil inlet seat, a first oil inlet channel communicated with the filter hole in the filter element is formed in the oil inlet seat, the filter element covers the oil passing hole, a second oil inlet channel is formed between the outer peripheral surface of the oil inlet seat and the inner hole wall of the oil inlet hole, and the second oil inlet channel bypasses the filter element and is communicated with the oil passing hole. The invention has the advantages of high lubrication reliability, good safety and the like.

Inventors

  • WANG GUANHUA
  • LUO QIN

Assignees

  • 温岭市麒元汽配有限公司

Dates

Publication Date
20260512
Application Date
20260402

Claims (10)

  1. 1. The automobile vacuum pump comprises a pump body (1) and a rotor (2), wherein the rotor (2) is connected with a blade (3) in a sliding manner, a pump cavity (101) is formed in the pump body (1), the blade (3) is in sealing and rotating fit with the pump cavity (101), and the automobile vacuum pump is characterized in that an oil inlet (4) communicated with the pump cavity (101) is further formed in the pump body (1), a fixing seat (5), an oil inlet seat (6) and an elastic element (7) are sequentially arranged in the oil inlet (4) from outside to inside in the radial direction, the oil inlet seat (6) abuts against the fixing seat (5) through the elastic element (7), an oil passing hole (51) is formed in the fixing seat (5), a filter element (8) is fixedly connected to the oil inlet seat (6), a first oil inlet channel (61) communicated with a filter hole (81) in the filter element (8) is formed in the oil inlet seat (6), the filter element (8) is covered with the oil inlet seat (51), an outer peripheral surface of the filter element (62) is formed between the second oil inlet channel (62) and the second oil inlet channel (51).
  2. 2. The vacuum pump for an automobile according to claim 1, wherein the side wall of the oil inlet seat (6) is provided with at least two connecting holes (63) which are penetrated radially, and the connecting holes (63) are always communicated with the first oil inlet channel (61) and the second oil inlet channel (62).
  3. 3. The vacuum pump for an automobile according to claim 2, wherein the oil inlet seat (6) is provided with a fixing groove (66) at one end close to the fixing seat (5), and the filter element (8) is fixed in the fixing groove (66).
  4. 4. A vacuum pump for an automobile according to claim 3, wherein the oil inlet seat (6) comprises a first cylinder (64) and a second cylinder (65) which are sequentially reduced in peripheral diameter, a second oil inlet passage (62) is formed between the peripheral surface of the first cylinder (64) and the inner hole wall of the oil inlet hole (4), and the connecting hole (63) is located on the side wall of the first cylinder (64).
  5. 5. A vacuum pump for a motor vehicle according to claim 4, wherein at least two oil compensating holes (67) are formed in the side wall of the first cylinder (64) in an axial direction, and the openings of the oil compensating holes (67) are covered by the lower end face of the fixing seat (5) and abutted against the lower end face.
  6. 6. The vacuum pump of any one of claims 1 to 5, wherein the oil inlet (4) comprises a main oil hole (41) and an oil supporting hole (42), the fixing seat (5), the oil inlet seat (6) and the elastic element (7) are sequentially arranged in the main oil hole (41), and two ends of the elastic element (7) respectively abut against one end of the oil inlet seat (6) and the bottom wall of the main oil hole (41).
  7. 7. The vacuum pump for an automobile according to claim 6, wherein a rotating hole (102) communicated with the pump cavity (101) is formed in the pump body (1), the rotor (2) and the rotating hole (102) are matched for rotation, and the oil supporting hole (42) extends to the rotating hole (102) from the bottom of the main oil hole (41) in an inclined and upward mode.
  8. 8. The vacuum pump for an automobile of claim 7, wherein an oil inlet groove (103) is formed in an orifice of the rotary hole (102) opposite to the oil supporting hole (42), and the oil inlet groove (103) axially extends to the pump cavity (101).
  9. 9. An automotive vacuum pump according to claim 8, characterized in that the rotor (2) includes a first rotating portion (21) and a second rotating portion (22), the outer peripheral diameter of the second rotating portion (22) is larger than that of the first rotating portion (21), the first rotating portion (21) is in rotary fit with a rotating hole (102) and abuts against each other, an upper end face of the second rotating portion (22) abuts against and is in rotary fit with a connecting face of the pump chamber (101) and the rotating hole (102), and the upper end face of the second rotating portion (22) covers the oil inlet groove (103) and the rotating hole (102).
  10. 10. An automotive vacuum pump according to claim 9, characterized in that a slide groove (23) is provided in the second rotating portion (22), and the vane (3) is slidably provided in the slide groove (23).

Description

Automobile vacuum pump Technical Field The invention relates to the technical field of vacuum pumps, in particular to an automobile vacuum pump. Background Automotive vacuum pumps are widely used to provide a vacuum source for vehicle braking systems and other auxiliary devices. A typical automotive vacuum pump generally includes a housing, a rotor, and vanes slidably mounted to the rotor, the rotor being driven by a camshaft or other driving component of the engine through a coupling device. To ensure reliable operation of the vacuum pump and its drive coupling, it is often necessary to lubricate the moving parts, in particular the coupling surfaces between the rotor and the drive parts, to prevent excessive wear and premature failure. In the prior art, engine lubricating oil is introduced through an oil inlet provided in a pump housing, and is delivered to a portion requiring lubrication through an internal oil passage. To prevent impurities in the lubricating oil from entering the interior of the pump body and causing wear or jamming, a filter screen or filter element is typically provided at the oil inlet to intercept particulate contaminants. However, during actual use, as the vehicle runs and forgets to clean in time, the screen surface gradually accumulates impurities, creating a plug. Once the filter screen is blocked, the flow of lubricating oil is significantly reduced or even interrupted, resulting in the coupling device and the moving parts inside the pump operating in an oil starved condition, thus causing rapid abnormal wear, seizing and even pump body damage. Especially in the driving process, if lubrication is suddenly interrupted due to the blockage of the filter screen, the vacuum pump can be quickly disabled, and serious potential safety hazards such as brake assistance loss and the like are caused. In the prior art, for example, in an automotive vacuum pump disclosed in patent document CN103857916B, although a separate lubrication line is provided to supply a lubrication fluid to a coupling device, the inlet of the lubrication line still depends on a filter element such as a filter screen, and thus the risk of clogging due to accumulation of impurities cannot be effectively solved. Therefore, how to avoid lubrication failure caused by filter screen blockage while guaranteeing lubrication reliability is a technical problem to be solved in the field. Disclosure of Invention Aiming at the defects existing in the prior art, the invention aims to provide an automobile vacuum pump. The automobile vacuum pump comprises a pump body and a rotor, wherein the rotor is connected with a blade in a sliding manner, a pump cavity is formed on the pump body, the blade is in sealing and rotating fit with the pump cavity, an oil inlet hole communicated with the pump cavity is further formed on the pump body, a fixing seat, an oil inlet seat and an elastic element are sequentially arranged in the oil inlet hole from outside to inside in the radial direction, the oil inlet seat abuts against the fixing seat through the elastic element, an oil passing hole is formed in the fixing seat, a filter element is fixedly connected to the oil inlet seat, a first oil inlet channel communicated with the filter hole in the filter element is formed in the oil inlet seat, the filter element covers the oil passing hole, and a second oil inlet channel is formed between the outer peripheral surface of the oil inlet seat and the inner hole wall of the oil inlet hole and is communicated with the filter element in a bypassing mode. According to the scheme, the combined valve body consisting of the fixing seat, the oil inlet seat and the elastic element is arranged in the oil inlet hole, two parallel oil inlet channels are constructed to be a first oil inlet channel and a second oil inlet channel, wherein the first oil inlet channel is directly communicated with the oil passing hole through the filter element, the second oil inlet channel is communicated with the oil passing hole after bypassing the filter element, that is to say, after the oil passing hole is blocked, the pressure of oil is transmitted to the filter element, the filter element is driven to drive the oil inlet seat to be far away from the fixing seat, and then the second oil inlet channel bypasses the filter element to directly pass through the oil hole, so that redundant supply of lubricating oil is realized. When the filter is blocked, the balance of the oil inlet seat on the oil pressure and the elastic element is broken, so that the filter is separated from the fixed seat, the second oil inlet passage is opened, the lubricating oil can directly enter by bypassing the blocked filter, the lubrication continuity is ensured, the problem of lubrication interruption caused by the blocking of the filter screen is fundamentally solved, and the operation reliability and safety of the vacuum pump are obviously improved. Further, at least two connecting holes which are