A high efficiency filter and filter easy to maintain reducer oil pump

Abstract

The application provides a reducer oil pump with high filtration efficiency and convenient filter maintenance, comprising a pump body, a filter assembly and a first sealing ring; the pump body is provided with a rotor cavity and a through hole for mounting the filter assembly, the middle part of the through hole is communicated with the rotor cavity through an oil inlet channel; the filter assembly comprises an outer end cover, a second sealing ring, a cylindrical support, a cylindrical screen, a disc-shaped support, a disc-shaped screen and an inner end cover; the outer end cover comprises a cover plate and a hollow piston body, the outer circumferential surface of the end part of the piston body is provided with an annular groove for accommodating the second sealing ring, the end surface of the piston body is provided with an oil inlet hole, and the middle part of the piston body is provided with an oil outlet hole; after the filter assembly is mounted into the through hole, the end part of the piston body on the outer end cover and the inner wall of the through hole are radially sealed through the second sealing ring, and a gap is left between the middle part of the piston body and the inner wall of the through hole; the cover plate of the outer end cover is used for capping the through hole on the pump body, and the cover plate of the outer end cover and the outer end surface of the pump body are sealed through the first sealing ring.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of transmission oil pump, and particularly relates to a reducer oil pump with a pump front filtering device. BACKGROUND

[0002] Large new energy reducers mainly play the role of reducing speed and increasing torque, and are widely applied to city electric buses. Since city electric buses are long-term low-speed heavy-load running, and power devices are mostly rear-mounted rear-drive, heat dissipation is poor, and the above aspects result in large wear of the motor reducer. The reducer oil pump mainly provides cooling and lubrication for planetary reduction gears, bearings and the like, and requires that the provided cooling and lubrication oil has high cleanliness. Therefore, a filter collecting device must be added to the oil inlet of the oil pump, impurities are filtered through the filter screen, and it is ensured that the oil sucked up by the oil pump does not contain large particles of impurities as much as possible, so that the wear of planetary gears, bearings and the like can be reduced. When the filter screen accumulates more and more impurities after being used for a long time, the oil inlet efficiency of the oil pump will be affected. At this time, in order to maintain the filter collecting device, the end face assembly needs to be disassembled to remove the filter assembly. However, the traditional filter is installed in the interior of the reducer, the end cover assembly and the reducer shell are installed by gluing and bolting, and the motor reducer assembly is a rear-mounted rear-drive structure. Therefore, the entire motor reducer assembly must be disassembled to remove the front end cover.

[0003] Therefore, in order to maintain the pump front filtering device of the reducer oil pump, the first is that the disassembly work is very large, and the second is that the end cover assembly is difficult to disassemble after being glued, and after disassembly, the sealant needs to be cleaned, the end cover needs to be washed and dried, and then the end cover is re-glued and installed. It can be seen that the maintenance convenience is poor, and the risk of oil leakage of the end cover assembly after secondary assembly is large. SUMMARY

[0004] In view of the above problems, the present application aims to provide a reducer oil pump with high-efficiency filtering and filter convenient to maintain.

[0005] To achieve the above-mentioned purposes, the application adopts the following scheme: a reducer oil pump with high efficiency and filter convenient to maintain, comprising a pump cover, a body cover sealing ring, an outer rotor, an inner rotor, a pump body, a filter assembly and a first sealing ring; the pump body is provided with a rotor cavity for mounting the inner and outer rotors, and a through hole for mounting the filter assembly, the middle part of the through hole is communicated with the rotor cavity through an oil inlet channel; the filter assembly comprises an outer end cover, a second sealing ring, a cylindrical support, a cylindrical screen, a disc-shaped support, a disc-shaped screen and an inner end cover; the outer end cover comprises a cover plate and a hollow piston body, the outer circumferential surface of the end part of the piston body is provided with an annular groove for accommodating the second sealing ring, the end surface of the piston body is provided with an oil inlet hole, and the middle part of the piston body is provided with an oil outlet hole; after the filter assembly is mounted into the through hole, the end part of the piston body of the outer end cover and the inner wall of the through hole are radially sealed through the second sealing ring, and a gap is left between the middle part of the piston body and the inner wall of the through hole; the cover plate of the outer end cover is used for covering the through hole on the pump body, and the cover plate of the outer end cover and the outer end surface of the pump body are sealed through the first sealing ring.

[0006] Preferably, the through hole is a stepped hole comprising an inner small hole section and an outer large hole section; the end part of the piston body and the inner wall of the small hole section are radially sealed through the second sealing ring.

[0007] Preferably, the cylindrical screen of the filter assembly is designed in a pleated pattern, and the pleats are greater than 40 teeth.

[0008] Preferably, the outer end surface of the pump body is provided with a sealing ring groove surrounding the through hole and used for mounting the first sealing ring.

[0009] Further, the pump body is further provided with a ventilation window cover plate.

[0010] The application has the following beneficial effects: since the end part of the piston body of the outer end cover and the inner wall of the through hole are radially sealed through the second sealing ring, and a gap is left between the middle part of the piston body and the inner wall of the through hole, the oil containing impurities in the oil sump of the reducer must pass through the cylindrical screen or the disc-shaped screen for filtration, and then enter the oil inlet channel through the oil inlet hole of the piston body, the oil outlet hole, the gap between the middle part of the piston body and the inner wall of the through hole; since the cover plate of the outer end cover is used for covering the through hole on the pump body, and the cover plate and the outer end surface of the pump body are sealed through the first sealing ring, the oil leakage from the outer end of the through hole can be avoided.

[0011] In the preferred technical scheme, the through hole is designed as a stepped hole comprising an inner small hole section and an outer large hole section, which can prevent the second sealing ring from being scratched by the hole wall when the filter assembly is installed, and can increase the gap between the middle part of the piston body and the inner wall of the through hole. The cylindrical screen of the filter assembly is designed in a pleated pattern, and the pleats are greater than 40 teeth, which can increase the filtering area of the cylindrical screen by about three times compared with the traditional cylindrical shape, so as to realize high efficiency filtration and prolong the maintenance period of the filter assembly. Attached Figure Description

[0012] Fig. 1 This is an exploded view of the oil pump in an embodiment of the present invention;

[0013] Fig. 2 This is a schematic cross-sectional view of the oil pump in an embodiment of the present invention;

[0014] Fig. 3 This is a schematic diagram of the pump body structure in an embodiment of the present invention;

[0015] Fig. 4 This is an exploded view of the filter assembly in an embodiment of the present invention;

[0016] In the picture:

[0017] 1 - Pump cover; 2 - Body cover sealing ring; 3 - Outer rotor

[0018] 4 - Inner rotor; 5 - Pump body; 6 - Vent window cover.

[0019] 7 - Filter assembly; 8 - First sealing ring

[0020] 51 – Small orifice section; 52 – Large orifice section; 53 – Oil inlet passage

[0021] 71—Outer end cap; 72—Second sealing ring; 73—Cylindrical support. 74 — Cylindrical screen 75 — Disc-shaped support 76 — Disc-shaped screen

[0022] 77—Inner end cap; 711—Piston body; 712—Annular groove. Detailed Implementation

[0023] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to embodiments. The content mentioned in the embodiments is not intended to limit the present invention.

[0024] In the description of this invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly defined. In the description of this invention, it should be noted that, unless otherwise specified and defined, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to mechanical or electrical connections, internal connections between two components, direct connections, or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of these terms according to the specific circumstances.

[0025] like Figs. 1 to 4As shown, a high-efficiency filter with easy-to-maintain reducer oil pump includes a pump cover 1, a body cover sealing ring 2, an outer rotor 3, an inner rotor 4, a pump body 5, a vent cover plate 6, a filter assembly 7, a first sealing ring 8, and screws for fastening. The pump body has a rotor cavity for installing the inner and outer rotors, and a through hole for installing the filter assembly 7. The through hole is a stepped hole, including an inner small hole section 51 and an outer large hole section 52, wherein the large hole section 52 communicates with the rotor cavity through an oil inlet passage 53. The filter assembly 7 includes an outer end cover 71, a second sealing ring 72, a cylindrical support 73, a cylindrical screen 74, a disc support 75, a disc screen 76, and an inner end cover 77. The outer end cover 71 covers... The pump body 711 includes a cover plate and a hollow piston body 711. The outer circumferential surface of the piston body 711 end is provided with an annular groove 712 for accommodating the second sealing ring 72. The piston body 711 end face is provided with an oil inlet hole, and the piston body 711 middle part is provided with an oil outlet hole. After the filter assembly 7 is installed into the through hole, the piston body 711 end of the outer end cover 71 and the inner wall of the small hole section 51 are radially sealed by the second sealing ring 72. A gap is left between the middle part of the piston body 711 and the inner wall of the large hole section 52. The cover plate of the outer end cover 71 is used to cover the through hole on the pump body. The cover plate of the outer end cover 71 and the outer end face of the pump body 5 are sealed by the first sealing ring 8. The outer end face of the pump body is provided with a sealing ring groove 54 surrounding the through hole and used to install the first sealing ring 8.

[0026] Because the piston body 711 end of the outer end cover 71 is radially sealed with the inner wall of the small hole section 51 by the second sealing ring 72, and there is a gap between the middle of the piston body 711 and the inner wall of the large hole section 52, the oil containing impurities in the oil pan of the reducer must be filtered through the cylindrical screen 74 or the disc screen 76 before it can pass through the oil inlet hole, oil outlet hole, and the gap between the middle of the piston body 711 and the inner wall of the through hole in sequence to enter the oil inlet passage 53; because the cover plate of the outer end cover 71 is used to cover the through hole on the pump body 5, and the cover plate and the outer end face of the pump body 5 are sealed by the first sealing ring 8, oil leakage from the outer end of the through hole can be avoided.

[0027] 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 product form and style of 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 technical solution of the present invention. As long as the content does not depart from the technical solution of the present invention, it still falls within the patent scope of the technical solution of the present invention.

Claims

1. A reducer oil pump with high-efficiency filtration and easy-to-maintain filter, characterized in that: The pump assembly includes a pump cover (1), a body cover sealing ring (2), an outer rotor (3), an inner rotor (4), a pump body (5), a filter assembly (7), and a first sealing ring (8). The pump body (5) has a rotor cavity for installing the inner and outer rotors, and a through hole for installing the filter assembly (7). The middle part of the through hole is connected to the rotor cavity through an oil inlet channel (53). The filter assembly (7) includes an outer end cover (71), a second sealing ring (72), a cylindrical support (73), a cylindrical screen (74), a disc support (75), a disc screen (76), and an inner end cover (77). The outer end cover (71) includes a cover plate and a hollow piston body (711). The outer circumferential surface of the piston body (711) end is provided with an annular groove (71) for accommodating the second sealing ring (72). 2) The piston body (711) has an oil inlet hole on its end face and an oil outlet hole in the middle of the piston body (711); after the filter assembly (7) is installed into the through hole, the piston body (711) end of the outer end cover (71) and the inner wall of the through hole are radially sealed by the second sealing ring (72), and a gap is left between the middle of the piston body (711) and the inner wall of the through hole; the cover plate of the outer end cover (71) is used to cover the through hole on the pump body (5), and the cover plate of the outer end cover (71) and the outer end face of the pump body (5) are sealed by the first sealing ring (8); the through hole is a stepped hole, including a small hole section (51) on the inner side and a large hole section (52) on the outer side; the piston body (711) end and the inner wall of the small hole section (51) are radially sealed by the second sealing ring (72).

2. The reducer oil pump with high-efficiency filtration and easy-to-maintain filter according to claim 1, characterized in that: The cylindrical screen (74) of the filter assembly (7) is designed with a pleated pattern and the pleats are greater than 40 teeth.

3. The reducer oil pump with high-efficiency filtration and easy-to-maintain filter according to claim 1, characterized in that: The outer end face of the pump body (5) is provided with a sealing ring groove (54) surrounding the through hole and used for installing the first sealing ring (8).

4. The reducer oil pump with high-efficiency filtration and easy-to-maintain filter according to claim 1, characterized in that: The pump body (5) is also equipped with a vent cover plate (6).

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