Brushless wiper motor armature shaft fixing mechanism

Abstract

The utility model discloses a brushless windscreen wiper motor armature shaft fixing mechanism which comprises an armature shaft, a deep groove ball bearing is installed on the armature shaft, a rotor is installed on the armature shaft, a shell is arranged outside the rotor, thrust ball bearings are installed on the head section and the tail section of the armature shaft, and the thrust ball bearings are installed on the shell. The thrust ball bearing is installed in an installation groove of the thrust ball bearing seat, a gradient expansion ring is arranged in the installation groove, a buffer gasket is arranged on the outer side of the thrust ball bearing seat, the end of the shell is connected with an end cover, and a honeycomb damping layer is arranged in the end cover. The motor is scientific and reasonable in structural design, avoids wiper shaking or noise caused by axial movement of the armature shaft due to damage of the deep groove ball bearing, greatly improves the bearing capacity of the motor to axial force by adding the thrust ball bearing, effectively prevents the deep groove ball bearing from being damaged by the axial force, and prolongs the service life of the motor.

Description

Technical Field

[0001] This utility model relates to the technical field of brushless wiper motor equipment, specifically a brushless wiper motor armature shaft fixing mechanism. Background Technology

[0002] Currently, brushless wiper motors are widely used in automobiles and other fields. However, existing brushless wiper motors have certain structural design flaws. Current brushless wiper motors mainly use deep groove ball bearings as rolling support components. While deep groove ball bearings can adapt to certain speeds and radial loads, they can only withstand relatively small axial forces. During prolonged wiper operation, various complex operating conditions, such as frequent starts and stops and varying wiping resistances, generate significant axial forces. Under these conditions, deep groove ball bearings are prone to damage from axial forces or increased axial clearance. This can cause axial movement of the armature shaft, leading to wiper vibration and noise during operation, severely impacting the normal use of the wiper and the driving experience. Therefore, we propose a brushless wiper motor armature shaft fixing mechanism. Utility Model Content

[0003] The purpose of this invention is to provide a brushless wiper motor armature shaft fixing mechanism to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a brushless wiper motor armature shaft fixing mechanism, comprising an armature shaft, a deep groove ball bearing mounted on the armature shaft, a rotor mounted on the armature shaft, a housing provided outside the rotor, thrust ball bearings mounted at the beginning and end sections of the armature shaft, the thrust ball bearings being installed in mounting grooves of thrust ball bearing seats, gradient expansion rings being provided in the mounting grooves, buffer washers being provided on the outer side of the thrust ball bearing seats, and an end cap being connected to the end of the housing, with a honeycomb damping layer provided inside the end cap.

[0005] In the above scheme, the deep groove ball bearing is installed in the deep groove ball bearing housing.

[0006] In the above scheme, an expansion groove is provided in the middle of the mounting groove, and the gradient expansion ring is installed in the expansion groove.

[0007] In the above scheme, the outer ring of the thrust ball bearing housing is provided with an annular groove, and a smart memory alloy clamp is installed in the annular groove.

[0008] In the above scheme, the buffer washer is a rubber ring.

[0009] In the above scheme, the end cap is fixedly connected to the outer shell by bolts.

[0010] In the above scheme, a through hole is provided in the middle of the end cap.

[0011] Compared with the prior art, the beneficial effects of this utility model are: the armature shaft fixing mechanism of this brushless wiper motor has a simple and reasonable structural design and strong practicality. By adding thrust ball bearings at both ends of the armature shaft, the axial movement of the armature shaft caused by damage to the deep groove ball bearing is prevented from causing wiper vibration or noise. By adding thrust ball bearings, the motor's ability to withstand axial force is greatly improved, effectively preventing damage to the deep groove ball bearing due to axial force and extending the service life of the motor.

[0012] The reduced axial movement of the armature shaft makes the wipers run more smoothly, eliminating vibration and noise and improving the user experience for drivers and passengers.

[0013] The design of the bearing housing and buffer pad enhances the stability of the bearing, further reduces vibration and noise during motor operation, and also improves the overall reliability of the motor. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model.

[0015] Figure 2 This utility model Figure 1 Schematic diagram of the structure at point A in the middle.

[0016] In the figure: 1. Armature shaft; 11. Deep groove ball bearing; 12. Deep groove ball bearing housing; 13. Rotor; 14. Housing; 15. Thrust ball bearing; 16. Thrust ball bearing housing; 17. Mounting groove; 18. Gradient expansion ring; 19. Expansion groove; 2. Annular groove; 21. Smart memory alloy clamp; 22. Buffer washer; 23. End cap; 24. Honeycomb damping layer. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] Please see Figure 1-2This utility model provides a technical solution: a brushless wiper motor armature shaft fixing mechanism, including an armature shaft 1, a deep groove ball bearing 11 mounted on the armature shaft 1, a rotor 13 mounted on the armature shaft 1, a housing 14 externally disposed on the rotor 13, thrust ball bearings 15 mounted at both ends of the armature shaft 1, the thrust ball bearings 15 being installed in mounting grooves 17 of thrust ball bearing seats 16, a gradient expansion ring 18 disposed in the mounting grooves 17, a buffer washer 22 disposed on the outer side of the thrust ball bearing seats 16, and an end cap 23 connected to the end of the housing 14, the end cap 23 having a honeycomb damping layer 24 disposed inside. A honeycomb-shaped metal rubber layer is adhered to the inner surface of the end cap, dissipating high-frequency vibration energy through the viscoelastic material.

[0019] Thrust ball bearings 15 are added at both ends of the armature shaft 1 to prevent the axial movement of the armature shaft 1 caused by damage to the deep groove ball bearing 11, which could lead to wiper vibration or noise. By adding thrust ball bearings 15, the motor's ability to withstand axial force is greatly improved, effectively preventing the deep groove ball bearing 12 from being damaged by axial force and extending the service life of the motor.

[0020] The axial movement of armature shaft 1 is reduced, making the wipers run more smoothly, eliminating vibration and noise, and improving the user experience for drivers and passengers.

[0021] The design of the bearing housing and buffer washer 22 enhances the stability of the bearing, further reduces vibration and noise during motor operation, and also improves the overall reliability of the motor.

[0022] In the above scheme, the deep groove ball bearing 11 is installed in the deep groove ball bearing housing 12.

[0023] In the above scheme, an expansion groove 19 is provided in the middle of the mounting groove 17, and the gradient expansion ring 18 is installed in the expansion groove 19. The bearing housing is embedded with a gradient expansion ring 18 made of copper-steel composite material, with the copper layer facing the bearing side, which automatically compensates for the gap change caused by temperature rise by utilizing the difference in thermal expansion coefficients of different materials.

[0024] For every 50°C increase in temperature, the ring expands by 0.05 mm, precisely offsetting the increase in bearing clearance.

[0025] In the above scheme, the outer ring of the thrust ball bearing housing 16 is provided with an annular groove 2, and a smart memory alloy clamp 21 is installed in the annular groove 2. When a Ni-Ti alloy clamp is installed on the outer ring of the deep groove ball bearing, a shape memory effect occurs when the temperature exceeds a critical value (such as 80°C), actively contracting and clamping the bearing housing.

[0026] In the above scheme, the buffer washer 22 is a rubber ring. The buffer washer is made of elastic materials such as rubber, which can absorb the vibration and impact force generated during motor operation, further reducing the impact on the bearing, and also helping to reduce noise generation.

[0027] In the above scheme, the end cap 23 is fixedly connected to the outer shell 14 by bolts.

[0028] In the above scheme, a through hole is provided in the middle of the end cap 23.

[0029] Working principle:

[0030] This brushless wiper motor armature shaft fixing mechanism adds thrust ball bearings 15 at both ends of the armature shaft 1 to prevent axial movement of the armature shaft 1 caused by damage to the deep groove ball bearing 11, which could lead to wiper vibration or noise. By adding the thrust ball bearings 15, the motor's ability to withstand axial forces is greatly improved, effectively preventing damage to the deep groove ball bearing 12 due to axial forces and extending the motor's service life. After the motor is powered on, the armature shaft 1 drives the rotor 13 to rotate, and the axial force is directly borne by the thrust ball bearings 15. The deep groove ball bearing 11 only bears radial loads, avoiding the risk of axial overload in traditional structures. When the temperature rises, the gradient expansion ring 18 expands to compensate for the axial clearance, and the shape memory alloy clamp 21 contracts to compensate for the radial clearance. The buffer washer 22 and the honeycomb damping layer 24 work together to suppress vibration, resulting in good noise control.

[0031] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A brushless wiper motor armature shaft fixing mechanism, comprising an armature shaft (1), characterized in that: A deep groove ball bearing (11) is installed on the armature shaft (1), a rotor (13) is installed on the armature shaft (1), a housing (14) is provided on the outside of the rotor (13), thrust ball bearings (15) are installed at the beginning and end of the armature shaft (1), the thrust ball bearings (15) are installed in the mounting groove (17) of the thrust ball bearing housing (16), a gradient expansion ring (18) is provided in the mounting groove (17), a buffer washer (22) is provided on the outside of the thrust ball bearing housing (16), an end cap (23) is connected to the end of the housing (14), and a honeycomb damping layer (24) is provided inside the end cap (23).

2. The brushless wiper motor armature shaft fixing mechanism according to claim 1, characterized in that: The deep groove ball bearing (11) is installed inside the deep groove ball bearing housing (12).

3. The brushless wiper motor armature shaft fixing mechanism according to claim 1, characterized in that: An expansion groove (19) is provided in the middle of the mounting groove (17), and the gradient expansion ring (18) is installed in the expansion groove (19).

4. The brushless wiper motor armature shaft fixing mechanism according to claim 1, characterized in that: The outer ring of the thrust ball bearing housing (16) is provided with an annular groove (2), and a smart memory alloy clamp (21) is installed in the annular groove (2).

5. The brushless wiper motor armature shaft fixing mechanism according to claim 1, characterized in that: The buffer gasket (22) is a rubber ring.

6. The brushless wiper motor armature shaft fixing mechanism according to claim 1, characterized in that: The end cap (23) is fixedly connected to the outer shell (14) by bolts.

7. The brushless wiper motor armature shaft fixing mechanism according to claim 1, characterized in that: The end cap (23) has a through hole in the middle.

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