Automobile rear axle breather

Abstract

The present invention discloses an air vent plug for an automobile rear axle, which includes an air vent plug main body (1). A vent hole (2) is formed in the center of the air vent plug main body (1). Inner baffles (3) are circumferentially and equidistantly arranged along the inner circle of the top surface of the air vent plug main body (1), and outer baffles (4) are circumferentially and equidistantly arranged along the outer circle of the top surface of the air vent plug main body (1). An elastic blocking mechanism is arranged at the lower end in the vent hole (2), and the top surface of the air vent plug main body (1) is a conical surface structure with the outer part being higher and the inner part being lower. The present invention can not only adjust the pressure in the rear axle cavity, but also ensure the effective reflux of gear oil, and can also prevent foreign objects from entering the rear axle.

Description

Technical Field

[0001] The present invention relates to a breather plug, particularly a breather plug for an automotive rear axle, belonging to the technical field of automotive parts. Background Art

[0002] The breather plug is a component of the rear axle, and it mainly has two functions: First, during the operation of the rear axle, the temperature gradually rises and the pressure in the cavity increases. To ensure that the rear axle does not explode, it is necessary to discharge air through the breather plug to reduce the pressure in the cavity, while preventing the outflow of gear oil to ensure sufficient lubrication. Second, when the rear axle is not working, the pressure in the cavity decreases, and external air enters the rear axle through the breather plug to ensure pressure balance, while it must be able to prevent foreign objects and impurities from being inhaled.

[0003] In the prior art, a breather plug with the Figure 1 shown structure is often used. The top of this breather plug has a labyrinth structure 100, and the root of the labyrinth structure 100 is a planar structure, resulting in the gear oil not being easy to flow back. And the oil return hole 200 of this breather plug is of equal-diameter design, resulting in the gear oil being easy to spray out and also easy to cause external foreign objects to enter the interior of the rear axle. The above problems all need to be improved urgently. Summary of the Invention

[0004] The purpose of the present invention is to provide a breather plug for an automotive rear axle to solve the technical problems in the prior art. It can both adjust the pressure in the rear axle cavity, ensure the effective return of gear oil, and prevent foreign objects from entering the rear axle.

[0005] The present invention provides a breather plug for an automotive rear axle, including a breather plug body. A ventilation hole is formed in the center of the breather plug body. Inner baffles are circumferentially and equidistantly arranged along the inner circle of the top surface of the breather plug body, and outer baffles are circumferentially and equidistantly arranged along the outer circle of the top surface of the breather plug body. An elastic blocking mechanism is arranged at the lower end in the ventilation hole, and the top surface of the breather plug body is a conical structure with the outer part higher than the inner part.

[0006] In the aforesaid breather plug for an automotive rear axle, preferably, a dust-proof net is sleeved on the top of the breather plug body.

[0007] In the aforesaid breather plug for an automotive rear axle, preferably, a breather plug cap is installed on the top of the breather plug body, and the dust-proof net is located inside the breather plug cap.

[0008] In the aforesaid breather plug for an automotive rear axle, preferably, threads are formed on the outer wall of the lower end of the breather plug body.

[0009] In the aforesaid breather plug for an automotive rear axle, preferably, a baffle is fixedly arranged at the bottom in the ventilation hole, and grooves are equidistantly formed at the edge of the baffle.

[0010] In the aforementioned breather plug for the rear axle of an automobile, preferably, the elastic blocking mechanism includes a spring and a blocking ball. The lower end of the spring is fixedly connected to the top surface of the baffle, and the upper end of the spring is fixedly connected to the blocking ball.

[0011] In the aforementioned breather plug for the rear axle of an automobile, preferably, a plurality of return holes are formed in the breather plug body. The top openings of the return holes are located on the top surface of the breather plug body, the bottom openings of the return holes are located on the inner wall of the breather plug body, the bottom openings of the return holes are communicated with the ventilation holes, and the bottom openings of the return holes are located below the blocking ball.

[0012] Compared with the prior art, the present invention includes a breather plug body. A ventilation hole is formed in the center of the breather plug body. Inner baffles are arranged at equal circumferential intervals along the inner circle of the top surface of the breather plug body, and outer baffles are arranged at equal circumferential intervals along the outer circle of the top surface of the breather plug body. An elastic blocking mechanism is arranged at the lower end in the ventilation hole, and the top surface of the breather plug body is a conical surface structure with the outer part higher than the inner part. Through the ventilation hole in the center of the breather plug body, the pressure balance between the inner cavity of the rear axle and the outside can be achieved. By arranging the elastic blocking mechanism, foreign matters from the outside can be effectively prevented from entering the rear axle through the ventilation hole. By designing the top surface of the breather plug body as a conical surface structure with the outer part higher than the inner part, the gear oil can effectively flow back into the rear axle, preventing waste of gear oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is an axonometric view of a commonly used breather plug in the prior art;

[0014] Figure 2 is a schematic structural view of the present invention;

[0015] Figure 3 is a top view of the baffle.

[0016] Description of the reference numerals:

[0017] In the prior art: labyrinth structure 100, oil return hole 200;

[0018] In the present invention: breather plug body 1, ventilation hole 2, inner baffle 3, outer baffle 4, dust-proof net 5, breather plug cap 6, thread 7, baffle 8, groove 9, spring 10, blocking ball 11, return hole 12. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present invention, and cannot be construed as a limitation of the present invention.

[0020] Embodiments of the present invention are as follows: As Figure 2 and Figure 3 shown, an air vent plug for an automotive rear axle includes a vent plug body 1. The outer shape of the vent plug body 1 is cylindrical. A vent hole 2 is formed in the center of the vent plug body 1. The vent hole 2 is opened along the axial direction of the vent plug body 1 and is coaxial with the vent plug body 1. Due to the opening of the vent hole 2, inner baffles 3 are circumferentially and equally spaced on the inner circle of the top surface of the vent plug body 1, and outer baffles 4 are circumferentially and equally spaced on the outer circle of the top surface of the vent plug body 1. An elastic blocking mechanism is provided at the lower end in the vent hole 2. The top surface of the vent plug body 1 is a conical surface structure with the outer part higher and the inner part lower.

[0021] In the present invention, by designing the top surface of the vent plug body 1 as a conical surface structure with the outer part higher and the inner part lower, the gear oil gushing out through the vent hole 2 can flow inward through this conical surface, enabling the gear oil to effectively flow back into the rear axle and reducing the waste of gear oil. By providing an elastic blocking mechanism in the vent hole 2, it can effectively prevent foreign objects from entering the rear axle along the vent hole 2.

[0022] In a specific embodiment, a dust-proof net 5 is sleeved on the top of the vent plug body 1. The dust-proof net 5 can further effectively prevent foreign objects from entering the vent hole 2. A vent plug cap 6 is installed on the top of the vent plug body 1, and the dust-proof net 5 is located inside the vent plug cap 6. The vent plug cap 6 is used to cover the top end of the vent plug body 1, serving the functions of preventing foreign objects from entering and preventing the gear oil from spraying out. It should be noted that the vent plug cap 6 and the vent plug body 1 are connected by snap connection, and there is a gap at their connection part through which air can enter and exit.

[0023] In addition, a thread 7 is formed on the outer wall of the lower end of the vent plug body 1. The vent plug body 1 is threadedly connected to the rear axle, facilitating installation and disassembly.

[0024] To prevent a large amount of gear oil from gushing out, preferably, a baffle 8 is fixedly provided at the bottom in the vent hole 2, and grooves 9 are equally spaced at the edge of the baffle 8. The baffle 8 can block most of the gear oil from spraying out, and the grooves 9 opened around the baffle 8 are for ventilation. Therefore, a part of the gear oil will still spray out through the parts of the grooves 9. However, the present application also has a spring blocking mechanism, and by the setting of the spring blocking mechanism, it can block a part of the gear oil again, so that only a very small amount of gear oil can spray out through the vent hole 2.

[0025] This small portion of the ejected gear oil will be blocked by the inner baffle 3 and the outer baffle 4 and slide down along the top surface of the vent plug body 1. Preferably, the elastic blocking mechanism includes a spring 10 and a blocking ball 11. The lower end of the spring 10 is fixedly connected to the top surface of the baffle 8, and the upper end of the spring 10 is fixedly connected to the blocking ball 11. A plurality of return holes 12 are formed in the vent plug body 1. The top opening of the return hole 12 is located on the top surface of the vent plug body 1, and the bottom opening of the return hole 12 is located on the inner wall of the vent plug body 1. The bottom opening of the return hole 12 is communicated with the vent hole 2, and the bottom opening of the return hole 12 is located below the blocking ball 11.

[0026] The gear oil sliding down along the top surface of the vent plug body 1 will directly flow back into the vent hole 2 through the return hole 12 and will not be blocked by the blocking ball 11. The main function of the blocking ball 11 is to block foreign objects from the outside.

[0027] In order to ensure that the blocking ball 11 can effectively seal the vent hole 2, in a preferred embodiment, the upper section of the vent hole 2 is designed as a tapered hole with a larger upper part and a smaller lower part. In this way, when the blocking ball 11 is pushed up by air pressure and then falls under the action of the spring 10, it will automatically move to the central position under the action of the tapered hole. Moreover, the upper space of the tapered hole is large, and there will be no jamming problem when the blocking ball 11 moves upward.

[0028] The working principle of the present invention: During use, the vent plug body 1 is installed on the rear axle through the cooperation of the thread 7 and the rear axle. When the pressure in the rear axle cavity is not equal to the external pressure, the internal and external gases can flow through the return hole 12 to achieve pressure balance. When the pressure in the rear axle cavity is too high to be quickly discharged through the return hole 12, the gas pushes the blocking ball 11, and a large amount of gas is discharged through the vent hole 2. At this time, some gear oil will be ejected along with the discharge of the gas. Most of the gear oil hits the baffle 8, and a small part of the gear oil enters the vent hole 2 through the groove 9. At this time, the blocking ball 11 can block a part of the gear oil again. Only a small part of the gear oil will finally be ejected from the vent hole 2 and finally hit the inner baffle 3 and the outer baffle 4. Then the gear oil flows inward along the top surface of the vent plug body 1 and flows back into the vent hole 2 through the return hole 12 and finally returns to the rear axle.

[0029] The structure, features and effects of the present invention have been described in detail based on the embodiments shown in the drawings. The above is only the preferred embodiment of the present invention, but the present invention is not limited to the scope shown in the drawings. Any changes made according to the concept of the present invention or equivalent embodiments modified into equivalent changes still fall within the spirit covered by the specification and the drawings, and should be within the protection scope of the present invention.

Claims

1. A vent plug for a rear axle of an automobile, comprising a vent plug body (1), characterized in that: A vent hole (2) is formed at the center of the vent plug body (1); inner baffles (3) are provided on the inner circle of the top surface of the vent plug body (1) at equal intervals along the circumferential direction; outer baffles (4) are provided on the outer circle of the top surface of the vent plug body (1) at equal intervals along the circumferential direction; an elastic blocking mechanism is provided at the lower end of the vent hole (2); and the top surface of the vent plug body (1) is a conical structure with a high outer surface and a low inner surface; A baffle (8) is fixedly provided at the bottom of the vent hole (2), and grooves (9) are formed at equal intervals on the edge of the baffle (8); The elastic blocking mechanism comprises a spring (10) and a blocking ball (11), the lower end of the spring (10) is fixedly connected to the top surface of the baffle (8), and the upper end of the spring (10) is fixedly connected to the blocking ball (11); A plurality of reflux holes (12) are formed in the vent plug body (1), the top openings of the reflux holes (12) are located on the top surface of the vent plug body (1), the bottom openings of the reflux holes (12) are located on the inner wall of the vent plug body (1), the bottom openings of the reflux holes (12) are connected to the vent hole (2), and the bottom openings of the reflux holes (12) are located below the blocking ball (11).

2. The automobile rear axle vent plug according to claim 1, characterized in that: A dustproof net (5) is sleeved on the top of the vent plug body (1).

3. The automobile rear axle vent plug according to claim 2, characterized in that: A vent plug cap (6) is installed on the top of the vent plug body (1), and the dustproof net (5) is located inside the vent plug cap (6).

4. The automobile rear axle vent plug according to claim 3, characterized in that: A thread (7) is formed on the outer wall of the lower end of the vent plug body (1).

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