Sealing assembly for a wiper motor

Abstract

The application relates to a sealing assembly of a wiper motor, which comprises an output shaft for driving a wiper arm of a vehicle to swing back and forth, a water delivery pipe arranged in the shaft hole of the output shaft, one end of the water delivery pipe extending out of the output shaft, the other end of the water delivery pipe being provided with a check ring, the check ring comprising a limiting shaft section and a flange shaft section, the limiting shaft section being in interference fit in the shaft hole of the water delivery pipe, the flange shaft section being abutted against the shaft end face of the water delivery pipe, the check ring being connected and fixed between the limiting shaft section and the shaft hole wall of the water delivery pipe and between the shaft end face of the flange shaft section and the shaft end face of the water delivery pipe through ultrasonic welding, a water spraying rod being inserted into the shaft hole of the water delivery pipe through the inner hole of the check ring, the water spraying rod being in sliding fit with the inner hole of the check ring, a sealing ring being arranged between the water spraying rod and the water delivery pipe, the inner circle of the sealing ring being in interference fit with the water spraying rod to form a seal, the shaft hole of the water delivery pipe being a stepped hole, and the sealing ring being located between the step face of the stepped hole and the limiting shaft section of the check ring.

Description

Technical Field

[0001] This invention relates to the technical field of automotive windshield wipers, and particularly to a sealing assembly for a wiper motor. Background Technology

[0002] Car windshield wipers are devices used to remove raindrops and dust adhering to the windshield of a vehicle, improving the driver's visibility and increasing driving safety. When there is no rain on the windshield but cleaning it with wipers is still necessary, it is usually necessary to spray water on the windshield to reduce friction during wiping, reduce noise, and enhance cleaning effectiveness.

[0003] Currently, in automotive windshield wiper spray mechanisms, the spray bar is often a fixed structure, typically with a fixed connection to the water supply pipe. However, with increasing demands and a growing pursuit of superior spray performance, the spray bar needs a certain degree of rotational space. If there is relative rotation between the spray bar and the water supply pipe, achieving a sealed connection becomes difficult, hindering the optimization and improvement of automotive windshield wiper spray systems. Therefore, how to achieve a good seal between the spray bar and the water supply pipe when there is relative rotation is a pressing technical problem that needs to be solved. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing a sealing assembly for a wiper motor that can achieve a good sealing connection between the spray bar and the water pipe when there is relative rotation between them.

[0005] The technical solution of this invention is as follows: a sealing assembly for a windshield wiper motor, comprising a motor housing and a motor shaft disposed within the motor housing. A reduction gearbox is disposed at one end of the motor housing, the reduction gearbox including a gear mechanism driven by the motor shaft. An output shaft is disposed at the power output end of the gear mechanism, the output shaft being used to drive the windshield wiper arm to reciprocate. The output shaft is a hollow shaft, and a water supply pipe is disposed within the shaft hole of the output shaft. One end of the water supply pipe extends out of the output shaft, and a connector for connecting a water source is fixedly disposed on the extended end of the water supply pipe. The connector is connected and fixedly fixed to the housing of the reduction gearbox. A retaining ring is disposed at the other end of the water supply pipe, the retaining ring including a limiting shaft section and a flange shaft section, the limiting shaft section passing through... An interference fit is made in the shaft hole of the water supply pipe. The end face of the flange shaft section near the water supply pipe abuts against the end face of the water supply pipe shaft. The retaining ring is ultrasonically welded to connect and fix the limiting shaft section to the wall of the shaft hole of the water supply pipe, and to connect and fix the end face of the flange shaft section to the end face of the water supply pipe shaft. A water spray rod is inserted into the shaft hole of the water supply pipe through the inner hole of the retaining ring. The water spray rod slides in fit with the inner hole of the retaining ring. A sealing ring is provided between the water spray rod and the water supply pipe. The inner circle of the sealing ring and the water spray rod are interference-fitted to form a seal. The shaft hole of the water supply pipe is a stepped hole. The sealing ring is located between the stepped surface of the stepped hole and the limiting shaft section of the retaining ring, forming an axial limit of the sealing ring.

[0006] Furthermore, a limiting boss is provided on the outer circumference of the limiting shaft section, and a limiting groove is provided on the shaft hole wall of the water supply pipe. The limiting boss cooperates in the limiting groove to form an axial limiting retaining ring.

[0007] Furthermore, at least two limiting bosses are provided along the axial direction on the outer circumference of the limiting shaft segment.

[0008] Furthermore, a sealing rubber ring is provided between the output shaft and the housing of the gearbox.

[0009] Furthermore, the connector has at least one protruding clip, and a snap-fit ​​seat is fixedly installed on the housing of the gearbox. Two limiting protrusions are provided on the end face of the snap-fit ​​seat. The clip on the connector is located between the two limiting protrusions of the snap-fit ​​seat to form a circumferential fixation of the water supply pipe. The clip on the connector abuts against the end face of the snap-fit ​​seat to form an axial positioning of the water supply pipe.

[0010] Furthermore, the connector is provided with three clips arranged in a circular pattern.

[0011] Furthermore, a guide cone hole is provided at the end of the inner hole of the retaining ring into which the water spray rod is inserted.

[0012] Furthermore, a guiding arc surface is provided at one end of the water spray rod that is inserted into the shaft hole of the water supply pipe.

[0013] Furthermore, both the water pipe and the retaining ring are made of plastic.

[0014] Furthermore, the outer diameter of the flange shaft section is equal to the outer diameter of the water supply pipe.

[0015] The above technical solution is adopted: the sealing assembly of the wiper motor includes a motor housing and a motor shaft disposed within the motor housing. A reduction gearbox is disposed at one end of the motor housing. The reduction gearbox includes a gear mechanism driven by the motor shaft. An output shaft is disposed at the power output end of the gear mechanism. The output shaft is used to drive the wiper arm of the car to reciprocate. The output shaft is a hollow shaft. A water supply pipe is disposed in the shaft hole of the output shaft. One end of the water supply pipe extends out of the output shaft. A connector for connecting a water source is fixedly disposed on the extended end of the water supply pipe. The connector is connected and fixedly fixed to the housing of the reduction gearbox. A retaining ring is disposed at the other end of the water supply pipe. The retaining ring includes a limiting shaft section and a flange shaft section. The limiting shaft section passes through... An interference fit is made in the shaft hole of the water supply pipe. The end face of the flange shaft section near the water supply pipe abuts against the end face of the water supply pipe shaft. The retaining ring is ultrasonically welded to connect and fix the limiting shaft section to the wall of the shaft hole of the water supply pipe, and to connect and fix the end face of the flange shaft section to the end face of the water supply pipe shaft. A water spray rod is inserted into the shaft hole of the water supply pipe through the inner hole of the retaining ring. The water spray rod slides in fit with the inner hole of the retaining ring. A sealing ring is provided between the water spray rod and the water supply pipe. The inner circle of the sealing ring and the water spray rod are interference-fitted to form a seal. The shaft hole of the water supply pipe is a stepped hole. The sealing ring is located between the stepped surface of the stepped hole and the limiting shaft section of the retaining ring, forming an axial limit of the sealing ring.

[0016] The sealing assembly includes a retaining ring fixed to the end of the water supply pipe. This retaining ring axially limits the seal between the washer boom and the water supply pipe, preventing the seal from dislodging regardless of the boom's rotation. This ensures a good seal even with relative rotation between the washer boom and the water supply pipe, improving windshield washer performance, ensuring stable and reliable operation, and reducing the failure rate. Furthermore, the retaining ring facilitates installation. Simply insert the seal into the axial hole of the water supply pipe, then insert the retaining ring's limiting section into the axial hole, and finally weld the retaining ring to the end of the water supply pipe using ultrasonic welding. This also prevents poor sealing due to improper installation of the seal.

[0017] Furthermore, a limiting boss is provided on the outer circumference of the limiting shaft section, and a limiting groove is provided on the wall of the shaft hole of the water supply pipe. The limiting boss cooperates in the limiting groove to form an axial limiting of the retaining ring. Through the cooperation of the limiting boss and the limiting groove, the retaining ring can be further prevented from falling out, thus improving the reliability of the retaining ring in limiting the sealing ring.

[0018] Furthermore, a sealing rubber ring is provided between the output shaft and the housing of the gearbox. This rubber ring can prevent water sprayed from the water spray bar from entering the housing of the gearbox and prevent water from entering the motor.

[0019] Furthermore, the connector has at least one protruding clip, and a snap-fit ​​seat is fixedly installed on the housing of the gearbox. Two limiting protrusions are provided on the end face of the snap-fit ​​seat. The clip on the connector is located between the two limiting protrusions of the snap-fit ​​seat, forming a circumferential fixation of the water supply pipe. The clip on the connector abuts against the end face of the snap-fit ​​seat, forming an axial positioning of the water supply pipe. The cooperation between the connector and the snap-fit ​​seat forms a fixed connection between the water supply pipe and the gearbox housing. The assembly of the water supply pipe is simple and quick, and the connection is stable and reliable.

[0020] Furthermore, the connector is provided with three circumferentially distributed clips, which can provide circumferential adjustment space for the water pipe during installation.

[0021] Furthermore, the inner hole of the retaining ring is provided with a guide cone hole at one end for inserting the water spray rod. The guide cone hole guides the insertion of the water spray rod, facilitating assembly.

[0022] Furthermore, one end of the water spray rod that is inserted into the shaft hole of the water supply pipe is provided with a guiding arc surface. This arc surface has a guiding function when the water spray rod is inserted into the shaft hole of the water supply pipe, which facilitates assembly.

[0023] Furthermore, both the water supply pipe and the retaining ring are made of plastic. The plastic water supply pipe and retaining ring have a certain deformation capacity, which facilitates the insertion of the retaining ring's limiting shaft section into the shaft hole of the water supply pipe during assembly.

[0024] Furthermore, the outer diameter of the flange shaft section is equal to the outer diameter of the water supply pipe. The fact that the two diameters are equal is more conducive to installation, so that the water supply pipe is not restricted by the flange shaft section and can fit well in the shaft hole of the output shaft.

[0025] In the sealing assembly of this invention, a retaining ring is fixed at the end of the water supply pipe. This retaining ring forms an axial limit for the seal between the spray bar and the water supply pipe, preventing the seal from coming off regardless of the rotation of the spray bar. This ensures a good sealing connection between the spray bar and the water supply pipe even when there is relative rotation, which is beneficial for optimizing and improving the windshield washer fluid spraying, making the washer fluid spraying stable and reliable, and reducing the failure rate. Moreover, the retaining ring also facilitates the installation of the seal. During installation, the seal is placed into the shaft hole of the water supply pipe, and then the limiting shaft section of the retaining ring is inserted into the shaft hole of the water supply pipe. The retaining ring is then welded and fixed to the end of the water supply pipe using ultrasonic welding. This also prevents poor sealing caused by improper installation of the seal. The assembly of the retaining ring with the water supply pipe and the spray bar is also simple and convenient.

[0026] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the sealing assembly of the windshield wiper motor;

[0028] Figure 2 for Figure 1 Enlarged view of A;

[0029] Figure 3 A schematic diagram of the structure for the water supply pipe, retaining ring, and spray bar;

[0030] Figure 4 A schematic diagram of a sealing ring installed inside a water pipe;

[0031] Figure 5 This is a schematic diagram of the structure for the connection between the connector and the card holder.

[0032] In the attached diagram, 1 is the output shaft, 2 is the water supply pipe, 3 is the retaining ring, 301 is the flange shaft section, 302 is the limiting shaft section, 303 is the limiting boss, 304 is the guide cone hole, 4 is the water spray rod, 401 is the arc surface, 5 is the connector, 501 is the clip, 6 is the snap-fit ​​seat, 601 is the limiting protrusion, and 7 is the sealing ring. Detailed Implementation

[0033] See Figures 1 to 5The sealing assembly of the windshield wiper motor includes a motor housing and a motor shaft disposed within the motor housing. A reduction gearbox is disposed at one end of the motor housing. The reduction gearbox includes a gear mechanism driven by the motor shaft. An output shaft 1 is disposed at the power output end of the gear mechanism, and the output shaft 1 is used to drive the windshield wiper arm to reciprocate. The output shaft 1 is a hollow shaft, and a water supply pipe 2 is disposed within the shaft hole of the output shaft 1. One end of the water supply pipe 2 extends out of the output shaft 1, and a connector 5 for connecting to a water source is fixedly disposed on the extended end of the water supply pipe 2. The connector 5 is connected and fixedly fixed to the housing of the reduction gearbox. The connector 5 has at least one protruding clip 501. A locking seat 6 is fixedly installed on the housing of the gearbox. Two limiting protrusions 601 are provided on the end face of the locking seat 6. The clip 501 on the connector 5 is located between the two limiting protrusions 601 of the locking seat 6, forming a circumferential fixation of the water supply pipe 2. The clip 501 on the connector 5 abuts against the end face of the locking seat 6, forming an axial positioning of the water supply pipe 2. The cooperation between the connector 5 and the locking seat 6 forms a fixed connection between the water supply pipe 2 and the gearbox housing. The assembly of the water supply pipe 2 is simple and quick, and the connection is stable and reliable. The connector 5 has three circumferentially distributed clips 501, which can provide circumferential adjustment space for the water supply pipe 2 during installation.

[0034] In this embodiment, a retaining ring 3 is provided at the other end of the water supply pipe 2. The retaining ring 3 includes a limiting shaft section 302 and a flange shaft section 301. The limiting shaft section 302 is interference-fitted into the shaft hole of the water supply pipe 2, and the end face of the flange shaft section 301 near the water supply pipe 2 abuts against the end face of the water supply pipe 2. The retaining ring 3 is connected and fixed between the limiting shaft section 302 and the wall of the shaft hole of the water supply pipe 2, and between the end face of the flange shaft section 301 and the end face of the shaft of the water supply pipe 2 by ultrasonic welding. The ultrasonic welding connection is a surface-to-surface connection, which makes the connection more stable. Further, a limiting boss 303 is provided on the outer circumference of the limiting shaft section 302, and a limiting groove is provided on the wall of the shaft hole of the water supply pipe 2. The limiting boss 303 fits in the limiting groove to form the axial limiting of the retaining ring 3. The engagement of the limiting boss 303 and the limiting groove further prevents the retaining ring 3 from dislodging, improving the reliability of the retaining ring 3 in limiting the sealing ring 7. Optionally, at least two limiting bosses 303 are provided axially on the outer circumference of the limiting shaft section 302, providing better limiting effect. Both the water pipe 2 and the retaining ring 3 are made of plastic, which has a certain deformation capacity, facilitating the insertion of the limiting shaft section 302 of the retaining ring 3 into the shaft hole of the water pipe 2 during assembly. The outer diameter of the flange shaft section 301 is equal to the outer diameter of the water pipe 2. Equal diameters facilitate installation, ensuring that the water pipe 2 is not restricted by the flange shaft section 301 and can fit well into the shaft hole of the output shaft 1.

[0035] In this embodiment, a water spray rod 4 is inserted into the shaft hole of the water supply pipe 2 through the inner hole of the retaining ring 3. The water spray rod 4 is slidably engaged with the inner hole of the retaining ring 3, meaning that the water spray rod 4 can rotate within the inner hole of the retaining ring 3. Furthermore, a guide cone hole 304 is provided at the end of the inner hole of the retaining ring 3 where the water spray rod 4 is inserted. The guide cone hole 304 guides the insertion of the water spray rod 4, facilitating assembly. Furthermore, a guiding arc surface 401 is provided at the end of the water spray rod 4 inserted into the shaft hole of the water supply pipe 2. This arc surface 401 guides the water spray rod 4 when it is inserted into the shaft hole of the water supply pipe 2, facilitating assembly. A sealing ring 7 is provided between the water spray rod 4 and the water supply pipe 2. The inner circle of the sealing ring 7 is press-fitted with the water spray rod 4 to form a seal. The shaft hole of the water supply pipe 2 is a stepped hole. The sealing ring 7 is located between the stepped surface of the stepped hole and the limiting shaft section 302 of the retaining ring 3, forming an axial limit for the sealing ring 7. One end of the output shaft 1 extends from the housing of the gearbox. A sealing rubber ring is provided between the output shaft 1 and the housing of the gearbox. This rubber ring can prevent water sprayed from the water spray rod 4 from entering the housing of the gearbox and prevent water from entering the motor.

[0036] In the aforementioned wiper motor sealing assembly, a retaining ring 3 is fixed to the end of the water supply pipe 2. This retaining ring 3 forms an axial limit for the sealing ring 7 between the spray bar 4 and the water supply pipe 2, preventing the sealing ring 7 from coming off regardless of how the spray bar 4 rotates. This ensures a good sealing connection between the spray bar 4 and the water supply pipe 2 even when there is relative rotation, which is beneficial for optimizing and improving the windshield washer fluid spraying, making the washer fluid spraying stable and reliable, and reducing the failure rate. Moreover, the retaining ring 3 also facilitates the installation of the sealing ring 7. During installation, the sealing ring 7 is placed into the shaft hole of the water supply pipe 2, and then the limiting shaft section 302 of the retaining ring 3 is inserted into the shaft hole of the water supply pipe 2. The retaining ring 3 is then welded and fixed to the end of the water supply pipe 2 by ultrasonic welding. This also prevents poor sealing caused by improper installation of the sealing ring 7. The assembly of the retaining ring 3 with the water supply pipe 2 and the spray bar 4 is also simple and quick.

Claims

1. A sealing assembly for a windshield wiper motor, comprising a motor housing and a motor shaft disposed within the motor housing, wherein a reduction gearbox is disposed at one end of the motor housing, the reduction gearbox comprising a gear mechanism driven by the motor shaft, characterized in that, The gear mechanism has an output shaft at its power output end, which drives the windshield wiper arm to reciprocate. The output shaft is hollow, and a water pipe is installed inside its shaft hole. One end of the water pipe extends out of the output shaft, and a connector for connecting to a water source is fixedly installed on this extended end. The connector is fixedly connected to the housing of the gearbox. The other end of the water pipe has a retaining ring, which includes a limiting shaft section and a flange shaft section. The limiting shaft section is interference-fitted into the shaft hole of the water pipe, and the end face of the flange shaft section near the water pipe abuts against the end face of the water pipe. The retaining ring is operated via ultrasonic testing. The limiting shaft section is welded to the wall of the shaft hole of the water supply pipe, and the end face of the flange shaft section is welded to the end face of the shaft of the water supply pipe. The outer diameter of the flange shaft section is equal to the outer diameter of the water supply pipe. A water spray rod is inserted into the shaft hole of the water supply pipe through the inner hole of the retaining ring. The water spray rod and the inner hole of the retaining ring are slidably fitted. A sealing ring is provided between the water spray rod and the water supply pipe. The inner circle of the sealing ring and the water spray rod are interference-fitted to form a seal. The shaft hole of the water supply pipe is a stepped hole. The sealing ring is located between the stepped surface of the stepped hole and the limiting shaft section of the retaining ring to form an axial limit of the sealing ring.

2. The sealing assembly for the wiper motor according to claim 1, characterized in that: A limiting boss is provided on the outer circumference of the limiting shaft section, and a limiting groove is provided on the shaft hole wall of the water pipe. The limiting boss cooperates in the limiting groove to form an axial limiting retaining ring.

3. The sealing assembly for the wiper motor according to claim 2, characterized in that: At least two limiting bosses are provided along the axial direction on the outer circumference of the limiting shaft section.

4. The sealing assembly for the wiper motor according to claim 1, characterized in that: A sealing rubber ring is provided between the output shaft and the housing of the gearbox.

5. The sealing assembly for the wiper motor according to claim 1, characterized in that: The connector has at least one protruding clip, and a snap-fit ​​seat is fixedly installed on the housing of the gearbox. Two limiting protrusions are provided on the end face of the snap-fit ​​seat. The clip on the connector is located between the two limiting protrusions of the snap-fit ​​seat to form a circumferential fixation of the water supply pipe. The clip on the connector abuts against the end face of the snap-fit ​​seat to form an axial positioning of the water supply pipe.

6. The sealing assembly for the wiper motor according to claim 5, characterized in that: The connector has three clips arranged in a circle.

7. The sealing assembly for the wiper motor according to claim 1, characterized in that: The inner hole of the retaining ring is provided with a guide cone hole at one end where the water spray rod is inserted.

8. The sealing assembly for the wiper motor according to claim 1, characterized in that: One end of the water spray rod that is inserted into the shaft hole of the water supply pipe is provided with a guiding arc surface.

9. The sealing assembly for the wiper motor according to claim 1, characterized in that: The water pipe and retaining ring are both made of plastic.

Images