Driving gear of oil pump

Abstract

The utility model discloses an oil pump driving gear which comprises a gear body provided with a central shaft hole, the gear body is an integral piece formed by powder metallurgy materials in a high-pressure die-casting mode, and annular grooves surrounding the central shaft hole are correspondingly formed in the two end faces of the gear body. Six through kidney-shaped holes are formed in the annular groove in an equal-radian mode. 42 teeth with the pressure angle of 20 degrees are formed on the circumferential surface of the gear body. The utility model has the advantages of light weight, high strength and good dimensional stability, and can meet the use requirements of vehicle engines.

Description

Technical Field

[0001] The utility model relates to the technical field of engines, in particular to an oil pump driving gear used in engines. Background Art

[0002] Traditionally, oil pump driving gears on the market are commonly manufactured using processes such as forging, extrusion, and drawing. These processes often result in complex manufacturing processes, high costs, heavy product weight, and poor dimensional stability. Therefore, the market demands a new type of oil pump driving gear with improved performance. Summary of the Invention

[0003] The technical problem to be solved by the utility model is to provide an oil pump driving gear with light weight, high strength, good dimensional stability and low manufacturing cost in view of the current status of the above-mentioned prior art.

[0004] The technical solution adopted by the present invention to solve the above technical problems is:

[0005] A driving gear for an oil pump comprises a gear body formed with a central shaft hole. The gear body is an integral part formed of powder metallurgy material by high-pressure die-casting. Annular grooves surrounding the central shaft hole are formed on both end faces of the gear body, and six waist-shaped holes with equal arcs are formed in the annular grooves. Forty-two teeth with a pressure angle of 20° are formed on the circumferential surface of the gear body.

[0006] To optimize the above technical solutions, the following measures are also taken:

[0007] The teeth are trapezoidal in shape, and an inclination angle of 5° is formed between the two side surfaces of the teeth and the end surface of the gear body.

[0008] The inner wall of the outer circle of the annular groove located on the front face of the gear body is a conical inclined wall, and an R-arc transition surface is formed between the conical inclined wall and the end face of the gear body.

[0009] An inner ring boss is formed between the central shaft hole and the annular groove. Combined chamfers for preventing stress concentration are formed between the inner ring boss and the central shaft hole and between the inner ring boss and the annular groove.

[0010] The above-mentioned combined chamfer is composed of a chamfered surface with a taper angle of 30° and a chamfered plane connecting the chamfered surface.

[0011] Two keyways are formed in the central shaft hole, and the two keyways are distributed 180° apart in the circumferential direction of the central shaft hole.

[0012] The inner ring boss has a protruding portion protruding into the annular groove at a position corresponding to the key groove.

[0013] The protruding portion protrudes between two adjacent waist-shaped holes.

[0014] Compared to existing technologies, the gear body of this utility model is formed using high-pressure die-casting from powder metallurgy. This material offers a simple and low-cost manufacturing process, high mechanical strength, and excellent dimensional stability. Annular grooves are formed on both end faces of the gear body, each containing six waist-shaped holes for further weight reduction. This makes the entire product lighter than conventional gears on the market, making it more energy-efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural diagram of the utility model;

[0016] Figure 2 yes Figure 1 CC cross-sectional view;

[0017] Figure 3 yes Figure 2 A partial enlarged schematic diagram of point Ⅰ in the middle;

[0018] Figure 4 yes Figure 2 A partial enlarged schematic diagram of point II in the middle. DETAILED DESCRIPTION

[0019] The embodiments of the present invention are described in further detail below with reference to the accompanying drawings.

[0020] Figures 1 to 4 It is a structural diagram of the present utility model.

[0021] The figures are marked as follows: inclination angle α, taper angle β, gear body 1, central shaft hole 1a, annular groove 1b, waist-shaped hole 1c, keyway 1d, tooth 11, tapered inclined wall 12, R-arc transition surface 13, inner ring boss 14, protrusion 141, chamfered inclined surface 15, and chamfered plane 16.

[0022] like Figures 1 to 4As shown, the utility model discloses an oil pump driving gear, including a gear body 1 formed with a central shaft hole 1a, and the gear body 1 is an integral part formed by high-pressure die-casting of powder metallurgy material. The gear body 1 die-cast by powder metallurgy material has good dimensional stability, high mechanical strength, and lighter product quality. In order to further reduce the weight of the product, the two end faces of the gear body 1 are respectively formed with a circle of annular grooves 1b, and the annular grooves 1b are arranged around the central shaft hole 1a. Six through waist-shaped holes 1c are also formed in the annular groove 1b, and the six waist-shaped holes 1c are distributed in the annular groove 1b with a medium arc. The total thickness of the gear body 1 of the utility model is 9 mm, and the depth of the annular grooves 1b on its two end faces is 3 mm. 42 teeth 11 with a pressure angle of 20° are formed on the circumferential surface of the gear body 1. The teeth 11 are used for meshing between gears to achieve the purpose of power transmission.

[0023] In the embodiment Figure 2 As shown, the tooth 11 of the present invention is trapezoidal in side view, and an inclination angle α of 5° is formed between the two side surfaces of the tooth 11 and the end surface of the gear body 1 .

[0024] from Figure 2 It can be seen that the annular groove 1b located on the front of the gear body 1 is slightly different from the annular groove 1b located on the back of the gear body 1. Figure 4 As shown, the inner wall of the outer circle of the annular groove 1b located on the front face of the gear body 1 is a conical inclined wall 12 , and an R-arc transition surface 13 is formed between the conical inclined wall 12 and the end face of the gear body 1 .

[0025] In the embodiment of the present invention, an inner ring boss 14 is formed between the central axial hole 1a and the annular groove 1b on the gear body 1. The height of the inner ring boss 14 is slightly lower than the end plane of the gear body 1, and its maximum diameter is 47 mm. The diameter of the central axial hole 1a of the present invention is 14 mm, and the total diameter of the gear body 1 is 90.4 mm. To prevent stress concentration and improve the product's service life, the present invention has a combined chamfer formed between the inner ring boss 14 and the central axial hole 1a, between the inner ring boss 14 and the annular groove 1b, and between the outer circumferential inner wall of the annular groove 1b on the back surface and the end face of the gear body 1.

[0026] like Figure 3 As shown, the combined chamfer is composed of a chamfered surface 15 with a taper angle β of 30° and a chamfered plane 16 connecting the chamfered surface 15. The length of the chamfered plane 16 of the utility model is 0.2 mm, and the distance from the top of the chamfered surface 15 to the chamfered plane 16 is also 0.2 mm.

[0027] like Figure 1As shown, two key grooves 1d are formed in the central shaft hole 1a of the present invention, and the two key grooves 1d are distributed 180° apart in the circumferential direction of the central shaft hole 1a.

[0028] Since the key groove 1 d is formed radially outward, the inner ring boss 14 has a protruding portion 141 protruding into the annular groove 1 b at a position corresponding to the key groove 1 d .

[0029] The protruding portion 141 of the present invention protrudes between two adjacent waist-shaped holes 1c.

[0030] The best embodiment of the present invention has been described, and various changes or modifications made by ordinary technicians in this field will not depart from the scope of the present invention.

Claims

1. A driving gear for an oil pump, comprising a gear body (1) formed with a central shaft hole (1a), characterized in that: The gear body (1) is an integral part formed by high-pressure die-casting of powder metallurgy material. An annular groove (1b) surrounding the central axis hole (1a) is correspondingly formed on both end faces of the gear body (1), and six through waist-shaped holes (1c) with equal arcs are also formed in the annular groove (1b); 42 teeth (11) with a pressure angle of 20° are formed on the circumferential surface of the gear body (1).

2. The oil pump driving gear according to claim 1, characterized in that: The tooth (11) is trapezoidal, and an inclination angle (α) of 5° is formed between the two side surfaces of the tooth (11) and the end surface of the gear body (1).

3. The oil pump driving gear according to claim 2, characterized in that: The outer inner wall of the annular groove (1b) located on the front face of the gear body (1) is a conical inclined wall (12), and an R-arc transition surface (13) is formed between the conical inclined wall (12) and the end face of the gear body (1).

4. The oil pump driving gear according to claim 3, characterized in that: An inner ring boss (14) is formed between the central shaft hole (1a) and the annular groove (1b), and a combined chamfer for preventing stress concentration is formed between the connection between the inner ring boss (14) and the central shaft hole (1a) and between the inner ring boss (14) and the annular groove (1b).

5. The oil pump driving gear according to claim 4, characterized in that: The combined chamfer is composed of a chamfered bevel (15) with a taper angle (β) of 30° and a chamfered plane (16) connecting the chamfered bevel (15).

6. The oil pump driving gear according to claim 5, characterized in that: Two keyways (1d) are formed in the central shaft hole (1a), and the two keyways (1d) are distributed 180° apart in the circumferential direction in the central shaft hole (1a).

7. The oil pump driving gear according to claim 6, characterized in that: The inner ring boss (14) has a protruding portion (141) protruding into the annular groove (1b) at a position corresponding to the key groove (1d).

8. The oil pump driving gear according to claim 7, characterized in that: The protruding portion (141) protrudes between two adjacent waist-shaped holes (1c).

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