Starter capable of preventing rear cover from being abraded

Abstract

The utility model discloses an automobile starter capable of preventing a rear cover from being abraded, and provides the starter capable of preventing the rear cover from being abraded to solve the problems that in the prior art, a rotating shaft of the starter drives a gasket to rotate, so that the rear cover is abraded, powder is polluted, and the rotating shaft moves axially. The device comprises a shell, a motor, a rear cover, a rotating shaft, a convex column, a wear-resistant shaft sleeve, a wear-resistant gasket, a locking gasket and a locking bolt. Convex columns with wear-resistant shaft sleeves are arranged on the inner wall of the rear cover, so that direct friction between the rotating shaft and the rear cover is reduced; the outer end face of the rear cover is provided with a positioning groove. A locking gasket is inserted into the end of the rotating shaft, and axial inward movement of the rotating shaft is limited through a locking bolt. When the rotating shaft rotates, the locking gasket is driven to rub with the anti-attrition gasket, the rear cover is prevented from being abraded, meanwhile, the rotating shaft is prevented from moving excessively in the axial direction, and the transmission stability with the isolator is guaranteed. The structure design is reasonable, the service life of the rear cover and the rotating shaft is effectively prolonged, and the operation reliability of the starter is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of automobile parts, and specifically relates to a rear cover wear-resistant starter for automobile engines, and in particular to a starter structure that solves the problem of rear cover wear and axial movement caused by shaft rotation. Background Art

[0002] The starter motor of an automobile engine is a key component for starting the engine. Its core structure includes a motor, electromagnetic assembly, and a check valve. The motor's shaft must extend through the rear cover and mesh with the engine's flywheel ring gear to transmit power. In existing technology, a gasket is typically placed at the end of the shaft to limit its axial movement. However, as the gasket rotates with the shaft, it easily rubs against the inner wall of the rear cover, leading to the following problems:

[0003] 1. Wear of the rear cover: The gasket rotates and rubs against the inner wall of the rear cover for a long time, causing the rear cover material to wear out. The metal powder generated by the wear can easily enter the interior of the motor, interfering with the normal operation of the windings, brushes and other components, and even causing short circuits or jamming.

[0004] 2. Uncontrolled axial movement of the shaft: When the rear cover is worn, the axial limit of the shaft fails. Excessive axial movement may occur due to vibration or impact, causing the shaft to fail to work with the transmission structure of the one-way clutch (such as the shift fork and drive gear), affecting the power transmission efficiency and even damaging the one-way clutch.

[0005] 3. High maintenance cost: The rear cover needs to be frequently replaced or repaired after being worn, which increases the maintenance cost of the vehicle.

[0006] Therefore, there is an urgent need for a starter with an improved structure to solve the problems of rear cover wear and axial movement of the rotating shaft. Utility Model Content

[0007] Technical problems to be solved

[0008] The utility model aims to solve the following technical problems existing in the existing starter:

[0009] 1. When the shaft drives the gasket to rotate, it rubs against the inner wall of the rear cover, causing the rear cover to wear and produce metal powder that contaminates the inside of the motor;

[0010] 2. After the rear cover is worn, the axial limit of the rotating shaft fails, and excessive axial movement is likely to occur, affecting the transmission stability with the one-way gear.

[0011] To achieve the above objectives, the present invention provides the following technical solution: a starter with a rear cover wear-resistant structure, comprising a housing, a motor, and a rear cover, wherein the motor is mounted within the housing, the rear cover is mounted at an opening of the housing and seals the motor, and the motor's rotating shaft extends from the rear cover; the starter further comprises a boss, a wear-resistant bushing, a friction-reducing washer, a stop washer, and a locking bolt, and the specific structure is as follows:

[0012] •Boss and wear-resistant bushing: At least one boss is provided on the inner wall of the rear cover (on the side close to the motor), and an axial hole is provided on the boss that runs through its thickness. A wear-resistant bushing is fixedly installed in the axial hole, and the rotating shaft passes through the wear-resistant bushing and is loosely fitted with it to reduce direct friction between the rotating shaft and the rear cover.

[0013] • Positioning structure of the friction-reducing washer: a positioning groove matching the friction-reducing washer is provided on the outward end surface of the rear cover (the side away from the motor), and the friction-reducing washer is placed in the positioning groove; at least two positioning holes (preferably two) are provided at the bottom of the positioning groove, and the positioning holes are symmetrically distributed along the diameter of the positioning groove; a positioning pin matching the positioning hole is provided on the friction-reducing washer, and the positioning pin is inserted into the positioning hole to fix the friction-reducing washer in the positioning groove to prevent it from rotating circumferentially.

[0014] •Stop washer and locking bolt: The stop washer is provided with a groove that matches the end of the rotating shaft, and the end of the rotating shaft is inserted into the groove; the locking bolt passes through the through hole on the stop washer and is threadedly connected to the end of the rotating shaft (a threaded hole is pre-processed at the center axis position of the rotating shaft end). By tightening the locking bolt, the stop washer is restricted between the end of the rotating shaft and the rear cover to prevent the rotating shaft from moving axially toward the inner cavity of the motor.

[0015] Furthermore, the wear-resistant sleeve is made of copper-based alloy or polytetrafluoroethylene material to improve wear resistance and friction reduction; the friction-reducing washer is made of high-carbon steel or ceramic material, and the surface can be hard chrome-plated to enhance wear resistance.

[0016] Furthermore, there are two positioning sockets, which are symmetrically arranged along the diameter of the positioning groove, ensuring that the friction-reducing washer is evenly stressed in the positioning groove to avoid deflection.

[0017] Furthermore, the groove of the stop washer matches the shape of the end of the rotating shaft so that the two fit tightly together to prevent the rotating shaft from slipping circumferentially.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0019] 1. Avoid wear on the rear cover: The shaft contacts the inner wall of the rear cover through a wear-resistant sleeve to reduce direct friction. At the same time, the shaft rotates, driving the stop washer to rotate synchronously. The stop washer rubs against the friction-reducing washer (rather than the rear cover), preventing the rear cover from being worn, reducing the generation of metal powder, and ensuring the cleanliness of the motor interior.

[0020] 2. Stabilize the axial position of the shaft: The stop washer is fixedly connected to the shaft by a locking bolt, limiting the axial movement of the shaft toward the inner cavity of the motor, preventing axial movement caused by wear or vibration, ensuring stable cooperation between the shaft and the transmission structure of the one-way clutch (such as the drive gear and shift fork), and improving power transmission efficiency.

[0021] 3. Extend component life: The setting of wear-resistant sleeves and friction-reducing washers reduces the wear rate of key components, reduces maintenance frequency and reduces use costs.

[0022] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural diagram of a specific embodiment of the utility model;

[0024] Figure 2 for Figure 1 A magnified view of middle A;

[0025] Figure 3 It is a cross-sectional view of the back cover in a specific embodiment of the present invention.

[0026] Figure 4 This is a cross-sectional view of the friction-reducing washer in a specific embodiment of the present invention.

[0027] Description of reference numerals:

[0028] 1-housing; 2-motor; 3-back cover; 4-rotating shaft; 5-boss; 6-wear-resistant bushing; 7-friction-reducing washer; 8-locating pin; 9-stop washer; 10-locking bolt; 11-locating slot; 12-locating socket; 13-groove. DETAILED DESCRIPTION

[0029] The present invention is described in detail below through embodiments, which are only used to further illustrate the present invention and should not be construed as limiting the scope of protection of the present invention.

[0030] like Figure 1 — Figure 4 As shown, this embodiment discloses a starter that prevents rear cover wear, including a housing 1, a motor 2, a rear cover 3, a rotating shaft 4, a boss 5, a wear-resistant sleeve 6, a friction-reducing washer 7, a stop washer 9 and a locking bolt 10.

[0031] • Installation of the motor and back cover: The motor 2 is fixedly installed in the housing 1, and the back cover 3 is installed at the opening of the housing 1 by bolts or snaps to block the motor 2, and the rotating shaft 4 of the motor 2 extends from the center position of the back cover 3.

[0032] • Boss and Wear-Resistant Bushing Configuration: A boss 5 is integrally formed on the inner wall of the rear cover 3. Boss 5 defines a shaft hole (slightly larger in diameter than the outer diameter of the shaft 4). A wear-resistant bushing 6 (made of a copper-based alloy) is press-fitted into the hole. The shaft 4 passes through the wear-resistant bushing 6, with a clearance fit of 0.05-0.1mm, reducing direct friction between the shaft 4 and the rear cover 3.

[0033] • Positioning and installation of the anti-friction washer: A positioning groove 11 (2-3mm deep, with a diameter matching the outer diameter of the anti-friction washer 7) is defined on the outer end surface of the rear cover 3 (the side facing away from the motor 2). Two positioning holes 12 (3-4mm in diameter, symmetrically distributed along the diameter of the positioning groove 11) are defined at the bottom of the positioning groove 11. The anti-friction washer 7 (made of high-carbon steel with a hard chrome plated surface) is placed in the positioning groove 11, with the positioning pin on it aligned with the positioning hole 12. The positioning pin 8 (with a diameter matching the positioning hole 12) is inserted into the positioning hole 12, securing the anti-friction washer 7 in the positioning groove 11 and preventing it from rotating in the circumferential direction.

[0034] • Connection between the stop washer and the rotating shaft: The stop washer 9 (made of spring steel) is provided with a groove 13 (the inner diameter of which matches the outer diameter of the end of the rotating shaft 4, and the depth is 1-2 mm). The end of the rotating shaft 4 is inserted into the groove 13. The locking bolt 10 passes through the through hole in the stop washer 9 and is threadedly connected to the screw hole at the end of the rotating shaft 4. When tightened, the stop washer 9 is compressed between the rear cover 3 and the rotating shaft 4, limiting the axial movement of the rotating shaft 4 toward the inner cavity of the motor 2 (axial clearance ≤ 0.2 mm).

[0035] When motor 2 starts, shaft 4 rotates, driving stop washer 9 to rotate synchronously. The outer surface of stop washer 9 rubs against the inner surface of anti-friction washer 7 (with a friction coefficient as low as 0.1), preventing direct contact between shaft 4 and rear cover 3, thereby preventing wear on rear cover 3. At the same time, stop washer 9 is secured by locking bolt 10, limiting axial movement of shaft 4 and ensuring stable engagement between shaft 4 and the drive gear of the one-way clutch, thereby ensuring efficient power transmission.

[0036] After adopting the above technical solution,

[0037] 1. Avoid wear on the rear cover: The shaft contacts the inner wall of the rear cover through a wear-resistant sleeve to reduce direct friction. At the same time, the shaft rotates, driving the stop washer to rotate synchronously. The stop washer rubs against the friction-reducing washer (rather than the rear cover), preventing the rear cover from being worn, reducing the generation of metal powder, and ensuring the cleanliness of the motor interior.

[0038] 2. Stabilize the axial position of the shaft: The stop washer is fixedly connected to the shaft by a locking bolt, limiting the axial movement of the shaft toward the inner cavity of the motor, preventing axial movement caused by wear or vibration, ensuring stable cooperation between the shaft and the transmission structure of the one-way clutch (such as the drive gear and shift fork), and improving power transmission efficiency.

[0039] 3. Extend component life: The setting of wear-resistant sleeves and friction-reducing washers reduces the wear rate of key components, reduces maintenance frequency and reduces use costs.

Claims

1. A starter with a rear cover wear-resistant design, comprising a housing (1), a motor (2) and a rear cover (3), wherein the motor (2) is mounted in the housing (1), the rear cover (3) is mounted at an opening of the housing (1) and blocks the motor (2), and a rotating shaft (4) of the motor (2) extends from the rear cover (3); characterized in that: It also includes a boss (5), a wear-resistant sleeve (6), a friction-reducing washer (7), a stop washer (9) and a locking bolt (10). The boss (5) is provided on the inner wall of the rear cover (3), and an axial hole is provided on the boss (5). A wear-resistant sleeve (6) is fixedly installed in the axial hole. The rotating shaft (4) passes through the wear-resistant sleeve (6) and is loosely fitted therewith. The outward end surface of the rear cover (3) is provided with a positioning groove (11), a friction-reducing washer (7) is placed in the positioning groove (11), and at least two positioning sockets are provided at the bottom of the positioning groove (11). (12), the friction-reducing washer (7) is provided with a positioning pin (8) corresponding to the positioning socket (12), and the positioning pin (8) is inserted into the positioning socket (12) to fix the friction-reducing washer (7) in the positioning groove (11); the stopping washer (9) is provided with a groove (13) adapted to the end of the rotating shaft (4), and the end of the rotating shaft (4) is inserted into the groove (13); the locking bolt (10) passes through the stopping washer (9) and is threadedly connected to the end of the rotating shaft (4), limiting the axial movement of the rotating shaft (4) toward the inner cavity of the motor (2).

2. The starter with anti-rear cover wear according to claim 1, characterized in that: The wear-resistant shaft sleeve (6) is made of copper-based alloy or polytetrafluoroethylene material.

3. The starter with anti-rear cover wear according to claim 1, characterized in that: The number of the positioning sockets (12) is 2 and they are symmetrically distributed along the diameter of the positioning groove (11).

4. The starter with anti-rear cover wear according to claim 1, characterized in that: The anti-friction washer (7) is made of high carbon steel or ceramic material, and its surface is hard chrome plated.

5. The starter with anti-rear cover wear according to claim 1, characterized in that: The groove (13) of the stop washer (9) matches the shape of the end of the rotating shaft (4), and the two are tightly fitted.

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