Limiting structure for worm gear component and gland of automobile wiper motor
By using a worm gear component integrally injection molded with a helical gear and output shaft, along with a spherical boss and platform limiting structure, the durability and stability issues of existing automotive wiper motor worm gear limiting mechanisms are solved, achieving reliable assembly and cost reduction.
Patent Information
- Application Number
- CN202423221862.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-26
- Publication Date
- 2026-01-20
- Estimated Expiration
- 2034-12-26
AI Technical Summary
The existing limiting method of the worm gear of automotive wiper motor has problems with the durability and stability of the retaining ring, and is prone to gear shaving or output shaft seizure when running under load for a long time.
The worm gear component, which is integrally injection molded with helical gear and output shaft, is axially limited by a spherical boss and platform, and limited by a metal or plastic gland. The retaining ring and flat washer are eliminated, and the limiting structure is optimized.
This achieves reliability and ease of assembly for the worm gear components, reduces costs, avoids the risk of wear and movement of the retaining ring, and improves the service life of the parts.
Smart Images
Figure CN223816070U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the structure of automobile wiper motor's worm wheel part and gland, and worm wheel plays the function of reducing the rotating speed and increasing the torque to motor, and the gland plays the role of fixing and supporting, is used to the wiper motor of car, and can be applied to all motors with worm gear reducer simultaneously. BACKGROUND
[0002] The volume of automobile wiper motor is limited by arrangement space, so it must have one or more stages of speed reduction mechanism to reduce speed and increase torque. The fixing mode of worm wheel becomes extremely important to play the role of speed reduction and torque increase. In the existing worm wheel limiting mode, the shaft sleeve in the reducer housing is used for radial limiting of worm wheel. The existing axial limiting mode generally opens one or more slots on the output shaft of worm wheel part, and the collar is clamped into the slot to prevent the worm wheel from moving up and down along the output shaft, so as to achieve the purpose of axial limiting. During the operation of the motor, the collar will rotate with the output shaft. In order to ensure the durability and stability of the collar, a gasket needs to be installed below the collar. Since there is a gap between the output shaft and the shaft sleeve, when the collar is pressed, it is necessary to ensure that each tooth of the collar is pressed in the same slot, otherwise there is a risk of worm wheel deflection. When running for a long time under load, there is a risk of shaving or shaft holding of the output shaft. SUMMARY
[0003] The utility model discloses a kind of limiting structures of automobile wiper motor worm wheel part and gland, and the worm wheel part and the reliable structure of gland of the structure are simple, low in cost.
[0004] The technical scheme of the utility model:
[0005] A kind of limiting structure of automobile wiper motor worm wheel part and gland, including worm wheel part and gland, worm wheel part includes helical gear and output shaft, helical gear is integrally injection molded with worm wheel output shaft, helical gear bottom has spherical boss, spherical boss supports gland, and is axially limited;Worm wheel helical gear top has platform;Gland is metal gland or plastic gland respectively;Metal gland is formed by punching with flat steel plate, and the plane contacted with worm wheel part is flat;Plastic gland is provided with a raised platform at the position contacted with helical gear.
[0006] Further, the worm wheel helical gear is a plastic gear, made of wear-resistant smooth material and injection molded.
[0007] Further, the spherical boss at the bottom of the worm wheel helical gear is used to limit the movement of the worm wheel towards the bottom of the reducer housing.
[0008] Further, the platform at the top of the worm wheel helical gear is used to limit the movement of the worm wheel towards the top of the reducer housing.
[0009] Further, the plane of the metal gland has roughness and flatness requirements.
[0010] Further, the plastic gland uses wear-resistant smooth material, and the raised platform is surrounded by reinforcing ribs.
[0011] The utility model has the following characteristics:
[0012] 1. The worm gear bevel gear bottom has a boss, which limits the movement of the worm gear to the reducer shell bottom.
[0013] 2. The worm gear bevel gear top has a platform, which limits the movement of the worm gear to the reducer shell top.
[0014] 3. The plastic gland platform is surrounded by reinforcing ribs to ensure the stiffness of the gland.
[0015] 4. The assembly structure does not have a ring and a flat washer supporting the ring, saving two parts.
[0016] 5. The worm gear output shaft has no ring assembly groove, saving the machining process of the card slot. BRIEF DESCRIPTION OF DRAWINGS
[0017] Figure 1 is the worm gear component isometric view,
[0018] Figure 2 is another direction worm gear component isometric view,
[0019] Figure 3 is the metal gland and worm gear component front view,
[0020] Figure 4 is the plastic gland isometric view.
[0021] Markings in the figure: 1, worm gear component, 2, bevel gear, 201, spherical boss, 202, platform, 3, output shaft, 4, metal gland, 401, plane, 5, plastic gland, 501, raised platform, 502, reinforcing rib. DETAILED DESCRIPTION
[0022] In order for those skilled in the art to better understand the utility model, the technical solutions of the utility model are further described below in conjunction with the drawings and examples.
[0023] Referring to Figures 1-4A kind of automobile wiper motor worm gear component and gland limiting structure, including worm gear component 1 and gland, worm gear component 1 includes helical gear 2 with output shaft 3, helical gear 2 is integrally injection molded together with worm gear output shaft 3, helical gear 2 bottom has spherical boss 201, spherical boss 201 supports the gland, carries out axial limiting, ensure that worm gear output shaft will not move towards the direction of spherical boss;Worm gear helical gear 2 top has platform 202;Gland is metal gland 4 or plastic gland 5 respectively;Metal gland 4 is formed by punching with flat steel plate, and the plane 401 that is contacted with worm gear component 1;Plastic gland 5 is provided with a raised platform 501 at the position contacted with helical gear, so as to ensure the dimensional accuracy of platform.
[0024] The worm gear helical gear 2 is a plastic gear, uses wear-resistant smooth material, and is injection molded.The worm gear pressure angle and helix angle are adjusted, the axial force of worm gear is designed to be small, and the service life of the part is increased.
[0025] The spherical boss 201 at the bottom of the worm gear helical gear 2 is used to limit the movement of the worm gear to the bottom of the reducer housing.
[0026] The platform 202 at the top of the worm gear helical gear 2 is used to limit the movement of the worm gear to the top of the reducer housing, i.e. the platform 202 is in contact with the flat washer to limit the movement of the worm gear output shaft towards the platform 202.
[0027] The plane 401 of the metal gland 4 has roughness and flatness requirements to ensure good contact with the spherical boss 201 of the worm gear helical gear.
[0028] The plastic gland 5 uses wear-resistant smooth material, and the raised platform 501 is surrounded by reinforcing ribs 502 to ensure the stiffness of the gland so that it will not deform significantly under stress.
[0029] The utility model has the following characteristics:
[0030] 1. The worm gear helical gear bottom has a boss, which limits the movement of the worm gear to the bottom of the reducer housing.
[0031] 2. The worm gear helical gear top has a platform, which limits the movement of the worm gear to the top of the reducer housing.
[0032] 3. The plastic gland platform is surrounded by reinforcing ribs to ensure the stiffness of the gland.
[0033] 4. The assembly structure does not have a collar and a flat washer supporting the collar, saving two parts.
[0034] 5. The worm gear output shaft does not have a collar assembly groove, saving the machining process of the card slot.
[0035] The above merely illustrates the specific embodiments of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of the changes or replacements within the technical range disclosed by the patent, which should be covered in the protection scope of the present application, therefore, the protection scope of the present application should be subject to the protection scope of the claims.
Claims
1. A limiting structure for a worm gear component and a pressure cap of an automotive wiper motor, characterized in that: The worm gear assembly (1) includes a worm gear component (1) and a pressure cap. The worm gear component (1) includes a helical gear (2) and an output shaft (3). The helical gear (2) and the worm gear output shaft (3) are integrally injection molded together. The bottom of the helical gear (2) has a spherical boss (201), which supports the pressure cap and performs axial positioning. The top of the worm gear helical gear (2) has a platform (202). The pressure cap is either a metal pressure cap (4) or a plastic pressure cap (5). The metal pressure cap (4) is formed by punching flat steel plate and has a flat surface (401) in contact with the worm gear component (1). The plastic pressure cap (5) has a raised platform (501) at the contact position with the helical gear.
2. The limiting structure of the automotive wiper motor worm gear component and the pressure cap as described in claim 1, characterized in that: The worm gear (2) is a plastic gear made of wear-resistant and smooth material and injection molded.
3. The limiting structure of the automotive wiper motor worm gear component and the pressure cap as described in claim 1, characterized in that: The spherical boss (201) at the bottom of the worm gear helical gear (2) is used to restrict the movement of the worm gear toward the bottom of the reducer housing.
4. The limiting structure of the automotive wiper motor worm gear component and the pressure cap as described in claim 1, characterized in that: The platform (202) at the top of the worm gear helical gear (2) is used to restrict the movement of the worm gear toward the top of the reducer housing.
5. The limiting structure of the automotive wiper motor worm gear component and the pressure cap as described in claim 1, characterized in that: The surface (401) of the metal cap (4) has requirements for roughness and flatness.
6. The limiting structure of the automotive wiper motor worm gear component and the pressure cap as described in claim 1, characterized in that: The plastic cap (5) is made of wear-resistant and smooth material, and the raised platform (501) is surrounded by reinforcing ribs (502).