Oil pump inner and outer rotor

Abstract

The utility model discloses an oil pump inner and outer rotor, including outer rotor and inner rotor, the outer rotor is annular ferroalloy structure, and the outer rotor central place sets up through -hole, and the around through -hole evenly arranged 8 concave tooth, and the inner rotor sets up in the through -hole, and the inner rotor is circular ferroalloy structure, and the around inner rotor evenly arranged 7 convex tooth, and the thickness of inner rotor and outer rotor is 10.5mm, and the cooperation clearance between inner rotor and outer rotor is 0.09 0.03mm. The utility model discloses structure design is reasonable and clever, utilizes ferroalloy to reduce overall thickness while guaranteeing overall strength, makes oil pump overall structure simplification, lightens oil pump weight, reduces production cost, adjusts cooperation clearance simultaneously, makes it both can reduce the friction between inner and outer rotor, simultaneously will not influence the dynamic performance of oil pump.

Description

Technical Field

[0001] This utility model relates to an inner and outer rotor of an oil pump. Background Technology

[0002] Rotary oil pumps are compact in structure, small in size, lightweight, have a high suction vacuum, large pumping volume, good oil supply uniformity, and low cost, making them widely used in medium and small engines. Generally, the inner rotor of a rotary oil pump has four or more convex teeth, while the outer rotor has one more concave tooth than the inner rotor. The inner and outer rotors form four working chambers, and eccentric motion changes the chamber volume: the volume on the inlet side increases to create a vacuum for oil suction, while the volume on the outlet side decreases to create high-pressure oil discharge. Currently, to ensure strength, the thickness of the inner and outer rotors is approximately 13.8mm, resulting in a relatively heavy overall pump and higher cost. The internal and external mating clearance is 0.05±0.03mm, leading to significant friction between the inner and outer rotors, accelerated wear, and a shorter pump lifespan. Utility Model Content

[0003] To overcome the above-mentioned shortcomings, this utility model provides an oil pump with an inner and outer rotor that is lightweight, low-cost, and has low friction between the inner and outer rotors, thus extending the service life of the oil pump.

[0004] To achieve this objective, the structure adopted in this utility model is as follows: an inner and outer rotor of an oil pump, including an outer rotor and an inner rotor. The outer rotor is a ring-shaped iron alloy structure with a through hole in the center and eight concave teeth evenly arranged around the through hole. The inner rotor is set inside the through hole and is a circular iron alloy structure with seven convex teeth evenly arranged around the inner rotor. A spline hole is set in the center of the inner rotor. The thickness of the inner rotor and the outer rotor is 10.5 mm.

[0005] The clearance between the inner rotor and the outer rotor is 0.09±0.03mm.

[0006] Its beneficial effects are: the structure of this utility model is reasonable and ingenious. By using iron alloy to ensure the overall strength while reducing the overall thickness, the overall structure of the oil pump is simplified, the weight of the oil pump is reduced, and the production cost is reduced. At the same time, the fitting clearance is adjusted so that it can reduce the friction between the inner and outer rotors without affecting the dynamic performance of the oil pump. Attached Figure Description

[0007] This utility model will be described by way of example and with reference to the accompanying drawings, wherein:

[0008] Figure 1 This is the front view of this utility model;

[0009] Figure 2 This is the front view of the outer rotor. Detailed Implementation

[0010] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0011] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used solely for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0012] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components; a fixed connection can be welding or adhesive bonding. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0013] like Figure 1 The oil pump shown has inner and outer rotors, including an outer rotor 1 and an inner rotor 4. The outer rotor 1 is as follows: Figure 2 As shown, the outer rotor 1 is a ring-shaped iron alloy structure with a central through hole 3. Eight concave teeth 2 are evenly arranged around the through hole 3. The outer ring diameter of the outer rotor 1 is 49.9 mm, the diameter of the through hole 3 is 34.56 mm, and the diameter of the circle formed by the eight concave teeth 2 is 43.4 mm. Adjacent concave teeth 2 are connected by an arc with a radius of 5.32 mm. The inner rotor 4 is located within the through hole 3. The inner rotor 4 is a circular iron alloy structure with seven convex teeth 5 evenly arranged around it. The convex teeth 5 cooperate with the concave teeth 2. The clearance between the inner and outer rotors is 0.09 ± 0.03 mm, which reduces friction and wear between the inner and outer rotors, extends the service life of the oil pump, and does not affect the dynamic performance of the oil pump due to increased clearance; vibration and noise are not increased as a result. The thickness of the outer rotor 1 and the inner rotor 4 is 10.5 mm. Reducing the thickness simplifies the overall structure of the oil pump, helps to reduce the weight of the oil pump, lowers production costs, and is also beneficial to environmental protection and sustainable development.

[0014] The reduction in rotor height means that higher strength and more wear-resistant materials are required to ensure the stability and reliability of the oil pump during long-term operation. The iron alloy includes 1-2% Ni, 0-2% Cu, 0.6-0.9% C, and the remainder is Fe. The inner and outer rotors are integrally formed by sintering the above-mentioned component powders, which can reduce the thickness while ensuring the overall structural strength.

[0015] Based on the above description and inspired by this utility model, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. An oil pump with inner and outer rotors, comprising an outer rotor (1) and an inner rotor (4), characterized in that, The outer rotor (1) is a ring-shaped iron alloy structure. A through hole (3) is provided in the center of the outer rotor (1). Eight concave teeth (2) are evenly arranged around the through hole (3). The inner rotor (4) is located in the through hole (3). The inner rotor (4) is a circular iron alloy structure. Seven convex teeth (5) are evenly arranged around the inner rotor (4). A spline hole (6) is provided in the center of the inner rotor (4). The thickness of the inner rotor (4) and the outer rotor (1) is 10.5 mm.

2. The inner and outer rotors of the oil pump according to claim 1, characterized in that, The fitting clearance between the inner rotor (4) and the outer rotor (1) is 0.09±0.03mm.

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