A waterproof and breathable structure for a starter

Abstract

The present invention discloses a waterproof and breathable structure for a starter, which is arranged on the starter housing and includes a breathable seat, a bushing and a rubber sealing ring. An installation cavity is arranged on the starter housing, and a through hole is arranged on the end face wall of the installation cavity. The breathable seat includes a main body part and a plug. The plug is arranged at the front end of the main body part and forms a limiting step. The main body part is hermetically assembled with the installation cavity. The plug extends into the through hole and there is a breathable gap between the two. A breathable hole is arranged inside the breathable seat, and the breathable hole is communicated with the breathable gap to form a breathable channel. The bushing is sleeved on the plug with a gap and is limited by the limiting step. The rubber sealing ring is arranged in the space surrounded by the bushing, the end face wall of the installation cavity and the plug, and the rubber sealing ring simultaneously abuts against the surfaces of the three, forming a barrier to the liquid in the breathable channel. When there is a pressure difference on both sides of the rubber sealing ring, the rubber sealing ring generates elastic deformation to form an air gap allowing gas to pass through.

Description

Technical Field

[0001] The present invention relates to the technical field of motor sealing, and particularly to a waterproof and breathable structure for a starter. Background Art

[0002] The inner cavity of a motor is generally a closed or highly sealed structure to improve the protection of the inner cavity. Especially in harsh working conditions, higher sealing requirements are needed. However, when the motor is in continuous working state, it will generate heat. In the sealed state of the inner cavity, the internal gas expands, and the internal pressure rises, causing the body to rupture. Even in extreme cases, high-temperature heat generation may cause the motor to burn out. To avoid the above situations, a breathable structure needs to be designed for the motor to facilitate the adjustment of its inner cavity pressure, but at the same time, its waterproof and sealing performance needs to be ensured. For this, currently, by setting a valve body structure such as a breathing valve, the air pressure balance in the inner cavity is achieved, which increases the structural complexity, raises the overall cost, and has low applicability. Summary of the Invention

[0003] Based on the above, the purpose of the present invention is to provide a waterproof and breathable structure for a starter, which is arranged at any position on the motor housing to adjust the air pressure in the motor inner cavity, realize the functions of waterproof and breathable, with simple installation and low cost.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A waterproof and breathable structure for a starter is arranged on the starter housing, and it includes a breathable seat, a bushing, and a rubber sealing ring. An installation cavity extending inward from the outer wall is provided on the starter housing, and a through hole communicating the inner cavity with the outside is provided on the end face wall of the installation cavity. The breathable seat includes a main body part and a plug. The plug is arranged at the front end of the main body part and forms a limiting step. The main body part is hermetically assembled with the installation cavity. The plug extends into the through hole and there is a breathable gap between the two. A breathable hole extending from the exposed surface of the main body part to the circumferential surface of the plug is provided inside the breathable seat. The breathable hole communicates with the breathable gap to form a breathable channel. The bushing is sleeved on the plug with a clearance and is limited by the limiting step. The rubber sealing ring is arranged in the space surrounded by the bushing, the end face wall of the installation cavity, and the plug, and the rubber sealing ring simultaneously abuts against the surfaces of the three to form a barrier to the liquid in the breathable channel. When there is an air pressure difference on both sides of the rubber sealing ring, the rubber sealing ring generates elastic deformation to form an air gap allowing gas to pass through.

[0006] Particularly, a limiting part protrudes from the tail end of the main body part. The limiting part is arranged outside the installation cavity to limit the insertion amount of the breathable seat, and one end orifice of the breathable hole is formed on the limiting part.

[0007] Particularly, the main body part and the installation cavity are connected by thread fitting.

[0008] Particularly, the main body part is press-fitted into the installation cavity with an interference fit.

[0009] Particularly, a plurality of orifices are circumferentially and uniformly distributed on the circumferential surface of the plug, and each orifice faces the inner circumferential surface of the bushing.

[0010] Particularly, the end face of the plug does not extend beyond the inner wall surface of the starter housing.

[0011] Particularly, the cross-section of the rubber sealing ring is circular.

[0012] Particularly, the inner edge of the rubber sealing ring just adheres to the circumferential surface of the plug.

[0013] Particularly, it further includes a mounting seat. An installation cavity is formed on the mounting seat. An assembly hole is provided on the starter housing. The mounting seat and the assembly hole are in threaded fit or interference fit.

[0014] In summary, the beneficial effects of the present invention are as follows. Compared with the prior art, the starter waterproof and breathable structure realizes the functions of liquid blocking and gas passage of the breathable channel through the cooperation of the sealing ring and the breathable seat and by using the principle of elastic deformation of the rubber body. The structure is simple, the cost is low, the setting is convenient, and it can be installed at any suitable position on the starter housing, thereby effectively preventing water and allowing air to pass through, ensuring the sealing performance and stable operation of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is an installation schematic diagram of the starter waterproof and breathable structure provided in Embodiment 1 of the present invention;

[0016] Figure 2 is Figure 1 the enlarged view at A in

[0017] Figure 3 is a schematic diagram of the starter waterproof and breathable structure provided in Embodiment 2 of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] The technical solution of the present invention will be further described below with reference to the drawings and through specific embodiments.

[0019] Embodiment 1:

[0020] Please refer to Figure 1 and 2 As shown, this embodiment provides a starter waterproof and breathable structure, which is arranged on the starter housing and can be installed at any suitable position on the starter housing according to needs. This embodiment takes the setting of this waterproof and sealing structure on the starter rear cover as an example.

[0021] This waterproof and breathable structure includes a breathable seat 1, a bushing 2, and a rubber sealing ring 3.

[0022] An installation cavity 4 extending inward from the outer wall is provided on the rear cover housing 11, and a through hole 5 communicating the inner cavity with the outside is provided on the end face wall of the installation cavity 4.

[0023] The air-permeable seat 1 includes a main body part and a plug 6. The plug 6 is arranged at the front end of the main body part and forms a limiting step 7. The main body part is hermetically assembled with the installation cavity 4. Specifically, the main body part and the installation cavity 4 are connected by thread fit, or the main body part is press-fitted into the installation cavity 4 with interference, as long as the sealing performance is ensured.

[0024] The plug 6 extends into the through hole 5 and there is an air-permeable gap 8 between the two. An air-permeable hole 9 extending from the exposed surface of the main body part to the circumferential surface of the plug 6 is provided inside the air-permeable seat 1. The air-permeable hole 9 is communicated with the air-permeable gap 8 to form an air-permeable channel. Specifically, a limiting part 10 protrudes from the tail end of the main body part. The limiting part 10 is arranged outside the installation cavity 4 to limit the insertion amount of the air-permeable seat 1. One end orifice of the air-permeable hole 9 is formed on the limiting part 10. A plurality of orifices are circumferentially and evenly distributed on the circumferential surface of the plug 6, and each orifice faces the inner ring surface of the bushing 2. The end face of the plug 6 does not exceed the inner wall surface of the starter housing and does not occupy the space of the motor inner cavity.

[0025] The bushing 2 is sleeved on the plug 6 with a gap and is limited by the limiting step 7. The rubber sealing ring 3 is arranged in the space surrounded by the bushing 2, the end face wall of the installation cavity 4 and the plug 6, and the rubber sealing ring 3 abuts against the surfaces of all three at the same time to form a barrier to the liquid in the air-permeable channel. When there is an air pressure difference on both sides of the rubber sealing ring 3, the rubber sealing ring 3 generates elastic deformation to form an air gap allowing gas to pass through.

[0026] Preferably, the cross section of the rubber sealing ring 3 here is circular. The inner edge of the rubber sealing ring 3 just adheres to or slightly presses against the circumferential surface of the plug 6, so that it can not only meet the requirement of isolating liquid but also meet the need of air permeability when the air pressure is unbalanced.

[0027] Embodiment 2:

[0028] Please refer to Figure 3 As shown, this embodiment provides a waterproof and breathable structure for a starter. Inspired by Embodiment 1, this waterproof and breathable structure further includes a mounting seat 12. To reduce the processing difficulty of the starter housing, only an assembly hole 13 needs to be opened at the required position on the starter housing, an installation cavity 4 is formed on the mounting seat 12, and then the air-permeable seat 1, the bushing 2 and the rubber sealing ring 3 are also arranged. Finally, the mounting seat 12 and the assembly hole 13 are in thread fit or interference fit to ensure the sealing performance.

[0029] In summary, the waterproof and breathable structure of the starter realizes the functions of liquid barrier and gas passage in the breathable channel through the cooperation of the sealing ring and the breathable seat, and by utilizing the principle of elastic deformation of the rubber body. The structure is simple, with low cost and convenient installation. It can be installed at any suitable position on the starter housing, thereby effectively preventing water and allowing air to pass through, ensuring the sealing performance and stable operation of the motor.

[0030] The above embodiments only illustrate the basic principles and characteristics of the present invention. The present invention is not limited by the above examples. Without departing from the spirit and scope of the present invention, there are various changes and modifications to the present invention, and these changes and modifications all fall within the scope of the present invention claimed. The scope of the present invention claimed is defined by the appended claims and their equivalents.

Claims

1. A waterproof and breathable structure of a starter, which is arranged on the starter housing, is characterized in that, It includes a breathable seat, a bushing and a rubber sealing ring. An installation cavity extending inward from the outer wall is provided on the starter housing. A through hole communicating the inner cavity with the outside is provided on the end face wall of the installation cavity. The breathable seat includes a main body part and a plug. The plug is arranged at the front end of the main body part and forms a limiting step. The main body part is hermetically assembled with the installation cavity. The plug extends into the through hole and there is a breathable gap between the two. Breathable holes are provided inside the breathable seat, extending from the exposed surface of the main body part to the circumferential surface of the plug. The breathable holes are communicated with the breathable gap to form a breathable channel. The bushing is sleeved on the plug with a clearance and is limited by the limiting step. The rubber sealing ring is arranged in the space surrounded by the bushing, the end face wall of the installation cavity and the plug, and the rubber sealing ring is simultaneously in contact with the surfaces of the three, blocking the liquid in the breathable channel. When there is a pressure difference on both sides of the rubber sealing ring, the rubber sealing ring generates elastic deformation to form an air gap allowing gas to pass through.

2. The starter waterproof and breathable structure according to claim 1, characterized in that: A limiting part protrudes from the tail end of the main body part. The limiting part is arranged outside the installation cavity to limit the insertion amount of the breathable seat. One end orifice of the breathable hole is formed on the limiting part.

3. The starter waterproof and breathable structure according to claim 1, characterized in that: The main body part and the installation cavity are connected by thread fitting.

4. The starter waterproof and breathable structure according to claim 1, characterized in that: The main body part is press-fitted into the installation cavity with an interference fit.

5. The starter waterproof and breathable structure according to claim 1, characterized in that: A plurality of orifices are circumferentially and uniformly distributed on the circumferential surface of the plug, and each orifice faces the inner ring surface of the bushing.

6. The starting motor waterproof and breathable structure according to claim 1, characterized in that: The end face of the plug does not exceed the inner wall surface of the starter housing.

7. The waterproof and breathable structure of the starter according to claim 1, wherein: The cross section of the rubber sealing ring is circular.

8. The starter waterproof and breathable structure according to claim 1, characterized in that: The inner edge of the rubber sealing ring just adheres to the circumferential surface of the plug.

9. The waterproof and breathable structure of the starter according to claim 1, wherein: It further includes a mounting seat. The installation cavity is formed on the mounting seat. An assembly hole is provided on the starter housing. The mounting seat and the assembly hole are in thread fitting or interference fit.

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