Oil pump structure

Abstract

The utility model discloses an oil pump structure which is characterized in that the oil pump structure comprises an outer rotor and an inner rotor, the outer rotor and the inner rotor are both made of engineering plastics, the inner side of the outer rotor is provided with wave-shaped inner teeth, the periphery of the inner rotor is provided with outer teeth corresponding to the wave-shaped inner teeth, and the middle of the inner rotor is provided with an axial through hole. One end of the axial through hole is provided with key grooves which are symmetrically arranged about the axis, the end faces of the two sides, corresponding to the wave-shaped inner teeth, of the outer rotor are provided with first lightening holes, and the end faces of the two sides, away from the key grooves, of the outer teeth of the inner rotor are provided with second lightening holes. The engine oil pump has the advantages that the structure is simple, the inner rotor and the outer rotor made of engineering plastics replace metal inner rotors and outer rotors, the weight of the engine oil pump is reduced, noise of the engine oil pump is lowered, abrasion is reduced, the engine oil pump is not prone to clamping stagnation, and the service life of the engine oil pump is long.

Description

Technical Field

[0001] The utility model relates to the field of oil pumps, in particular to an oil pump structure. Background Art

[0002] The existing oil pump is made of metal material, and there is hard metal friction between the driving gear and the driven gear, which makes the engine noisy and accompanied by abnormal noise when working. In addition, the processing accuracy is high, the processing difficulty is high, and the processing cost is increased. At the same time, the shaft hole is easy to wear, which shortens the service life of the oil pump gear. Summary of the invention

[0003] In view of the above-mentioned deficiencies in the prior art, the utility model provides an oil pump structure, which reduces the weight of the inner and outer rotors, improves the fuel efficiency of the engine, and reduces wear.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A lubricating oil pump structure, characterized in that it comprises an outer rotor and an inner rotor, both of which are made of engineering plastics, the inner side of the outer rotor has corrugated inner teeth, the outer periphery of the inner rotor has outer teeth corresponding to the corrugated inner teeth, the middle part of the inner rotor has an axial through hole, one end of the axial through hole has a keyway symmetrically arranged about the axis, the end faces on both sides of the outer rotor corresponding to the corrugated inner teeth have first weight-reducing holes, and the end faces on both sides of the inner rotor away from the outer teeth of the keyway have second weight-reducing holes.

[0006] Furthermore, the outer rotor has 8 wave-shaped internal teeth, and the inner rotor has 7 external teeth.

[0007] Furthermore, the first weight-reducing hole and the second weight-reducing hole are not through-holes.

[0008] Furthermore, the first weight-reducing hole is in a hump shape, and the second weight-reducing hole is in a triangle shape.

[0009] The beneficial effects of the utility model include: simple structure, replacing metal inner and outer rotors with inner and outer rotors made of engineering plastics, thereby reducing the weight of the oil pump, reducing the noise of the oil pump, reducing wear, making the oil pump less likely to get stuck, and extending the service life of the oil pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a structural schematic diagram of the utility model. DETAILED DESCRIPTION

[0011] The present invention will be further described in detail below in conjunction with specific embodiments and accompanying drawings.

[0012] A kind of Figure 1The oil pump structure shown includes an outer rotor 1 and an inner rotor 2, both of which are made of engineering plastics. The inner side of the outer rotor 1 has a corrugated inner tooth 3, and the outer circumference of the inner rotor 2 has an outer tooth 4 corresponding to the corrugated inner tooth, wherein the tooth top and tooth root of the corrugated inner tooth 3 are in arc transition, and the tooth tops of the outer teeth 4 are in arc transition. The middle part of the inner rotor 2 has an axial through hole 5, and one end of the axial through hole 5 has a keyway 6 arranged symmetrically about the axis. The shaft driving the inner rotor 2 is connected to the inner rotor through a key set in the keyway 6. The outer rotor 1 has first weight-reducing holes 7 on both side end faces corresponding to the corrugated inner tooth 3, so that the mass of the outer rotor is lighter. The inner rotor 2 has second weight-reducing holes 8 on both side end faces of the outer teeth 4 away from the keyway 6. Both the first weight-reducing holes 7 and the second weight-reducing holes 8 are not through.

[0013] In order to make the oil pump last for a long time, the outer rotor 1 in this embodiment has 8 wave-shaped inner teeth 3, and the inner rotor 2 has 7 outer teeth 4. Even if it is used for a long time, there will be no jamming due to thermal expansion.

[0014] In this embodiment, the first weight-reducing hole 7 is in a hump shape, and the second weight-reducing hole 8 is in a triangular shape. This structure can meet the structural strength requirements while maximizing the total weight reduction, thereby improving the efficiency of the oil pump.

[0015] The technical solutions provided by the embodiments of the present invention are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the embodiments of the present invention. The description of the above embodiments is only applicable to help understand the principles of the embodiments of the present invention. At the same time, for those skilled in the art, according to the embodiments of the present invention, there will be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. An oil pump structure, characterized in that: The invention comprises an outer rotor (1) and an inner rotor (2), wherein the outer rotor (1) and the inner rotor (2) are both made of engineering plastics, the inner side of the outer rotor (1) is provided with corrugated inner teeth (3), the outer periphery of the inner rotor (2) is provided with outer teeth (4) corresponding to the corrugated inner teeth, the middle part of the inner rotor (2) is provided with an axial through hole (5), one end of the axial through hole (5) is provided with a keyway (6) symmetrically arranged about an axis, the end surfaces on both sides of the outer rotor (1) corresponding to the corrugated inner teeth (3) are provided with first lightening holes (7), and the end surfaces on both sides of the outer teeth (4) on the inner rotor (2) away from the keyway (6) are provided with second lightening holes (8).

2. The oil pump structure according to claim 1, characterized in that: The outer rotor (1) has eight wave-shaped internal teeth (3), and the inner rotor (2) has seven external teeth (4).

3. The oil pump structure according to claim 1, characterized in that: The first weight-reducing hole (7) and the second weight-reducing hole (8) are not through-holes.

4. The oil pump structure according to claim 1, characterized in that: The first weight-reducing hole (7) is in a hump shape, and the second weight-reducing hole (8) is in a triangle shape.

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