JP2007253645A - Wiper device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce cost of a wiper device provided with a nozzle for injecting cleaning liquid in a wiper shaft. <P>SOLUTION: A cleaning liquid supply pipe 18 inserted and molded with the nozzle 19 at a wiper arm side end part is fitted into an insertion hole 17 opened in a shaft direction in the wiper shaft 16. A washing liquid supply connecting member 22 integrally formed by rubber or resin is fitted to the other end part of the cleaning liquid supply pipe 18. A joint part 24 fitted into a mounting hole 21 of a cover 14 is formed at one end part of the cleaning liquid supply connecting member 22. A check valve 26 is fitted to a connecting part 23 formed integrally with the other end part of the cleaning liquid supply connecting member 22. A thrust bearing 15 in sliding contact with the cover 14 is provided at one end part of the wiper shaft 16. The number of parts and assembling man-hours can be reduced, and thereby cost can be reduced. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a wiper device, and more particularly to a device that injects a cleaning liquid from a wiper shaft, and more particularly to a device that is effective for use in a rear wiper device that wipes a rear windshield glass of an automobile.

As a rear wiper device for an automobile, a nozzle is inserted into an insertion hole formed in a wiper shaft, and a cleaning liquid is sprayed from a nozzle that rotates together with the wiper shaft while wiping with a wiper arm to clean the rear windshield glass. (For example, refer to Patent Document 1 and Patent Document 2).
In a rear wiper device having a nozzle for injecting such cleaning liquid, a check valve is interposed between the washer tank and the nozzle in order to prevent leakage of the cleaning liquid from the injection port.
Japanese National Patent Publication No. 6-500060 Japanese National Patent Publication No. 11-508850

In the rear wiper device provided with the conventional cleaning liquid injection nozzle, since the check valve is provided in the middle of the cleaning liquid supply path via the tube, there is a problem that the number of parts and the number of assembling steps increase.
Further, since the cleaning liquid supply pipe to the nozzle is incorporated in the wiper shaft, the sealing structure for the cleaning liquid supply pipe in the gear case of the wiper motor is complicated.

  An object of the present invention is to provide a wiper device that can solve the above problems and reduce the manufacturing cost.

Typical means for solving the above-described problems are as follows.
(1) A bottomed gear case that houses a power transmission unit that transmits the rotational force of the motor to the output shaft, a cover that covers the opening of the gear case, and a wiper arm that is attached to one end of the output shaft. A wiper device,
A cleaning liquid supply pipe is fitted into an insertion hole opened in the axial direction of the output shaft, and a nozzle having an injection port is provided at one end of the cleaning liquid supply pipe on the wiper arm side,
A cleaning liquid supply connecting member is fitted to the other end of the cleaning liquid supply pipe,
At one end of the cleaning liquid supply connecting member, a joint portion is formed to be fitted into the mounting hole formed in the cover,
A wiper device characterized in that a connecting portion connectable to the cleaning liquid supply portion is integrally formed at the other end of the cleaning liquid supply connecting member.
(2) The wiper device according to (1), wherein a check valve is fitted to the connection portion of the cleaning liquid supply member.
(3) The wiper device according to (1) or (2), wherein a thrust bearing that is in sliding contact with the cover is provided at one end of the output shaft.
(4) The wiper device according to any one of (1) to (3), wherein the joint portion is formed in a rubber bush shape that fits into the mounting hole.
(5) The wiper device according to any one of (1) to (4), wherein an annular lip is formed on the inner periphery of the hollow portion of the joint portion so as to project in contact with the outer peripheral surface of the cleaning liquid supply pipe.
(6) The wiper device according to any one of (1) to (5), wherein the nozzle and the cleaning liquid supply pipe are insert-molded.
(7) The wiper device according to any one of (1) to (6), wherein the cleaning liquid supply connecting member is integrally formed of rubber or resin.

  According to (1), the number of parts and the number of assembling steps are reduced, and the seal structure of the nozzle cleaning liquid supply pipe in the wiper motor gear case is simplified, so that the manufacturing cost of the wiper device can be greatly reduced. Can do.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

In the present embodiment, the wiper device according to the present invention is configured to be suitable for application to a rear wiper device of an automobile.
The rear wiper device according to the present embodiment includes the wiper motor 10 shown in FIG. The wiper motor 10 is configured to be installed on a rear panel (not shown) in the vicinity of the rear windshield glass of the automobile.

  As shown in FIGS. 1 and 2, the wiper motor 10 includes an electric motor 11 and a power transmission unit that transmits the rotational force of the electric motor 11 to the wiper shaft (the pinion gear 12 that is the final stage is shown in FIG. 2. 2) is housed, and a cover 14 (see FIG. 2) covering the gear case 13 is provided.

A wiper shaft 16, which is an output shaft of the wiper motor 10, is inserted into one main surface (hereinafter referred to as an upper surface) of the gear case 13 and is rotatably supported. A pinion gear 12 is attached to an end of the gear case 13. It is fitted and fixed so as to be orthogonal.
A thrust bearing 15 formed in a cylindrical shape having a flange is fitted to the lower surface of the fixed portion between the wiper shaft 16 and the pinion gear 12, and the lower surface of the thrust bearing 15 is in sliding contact with the inner surface of the cover 14. The thrust bearing 15 is configured to support the thrust force of the wiper shaft 16.
Further, the protruding end portion of the wiper shaft 16 from the gear case 13 is configured to fix a wiper arm (not shown).

As shown in FIGS. 2 and 3, an insertion hole 17 is formed on the center line of the wiper shaft 16 over the entire length. A cleaning liquid supply pipe 18 is fitted into the insertion hole 17 so as to rotate integrally.
The cleaning liquid supply pipe 18 is made of a metal pipe such as brass and is formed in a cylindrical shape that is longer than the wiper shaft 16, and a nozzle 19 is resin-molded at the upper end that is the end on the wiper arm side. The nozzle 19 has an injection port 20 for injecting the cleaning liquid, and the injection port 20 protrudes from the wiper shaft 16. As a result, the cleaning liquid that has passed through the cleaning liquid supply pipe 18 is sprayed from the injection port 20 onto the rear windshield glass.
In addition, the injection port 20 can also make the particle size of an injection liquid fine by press-fitting a separate injection tip according to a use.

As shown in FIGS. 2 and 3, a circular attachment hole 21 is formed on the center line of the wiper shaft 16 in the cover 14. The diameter of the mounting hole 21 is set smaller than the inner diameter of the cylindrical hollow portion of the thrust bearing 15 and larger than the cleaning liquid supply pipe 18.
A cleaning liquid supply connecting member 22 is attached to the attachment hole 21.

  The cleaning liquid supply connecting member 22 is made of rubber or resin and is integrally formed into an elbow tube shape. One end portion of the cleaning liquid supply connecting member 22 constitutes a connection portion 23 for connecting to an external cleaning liquid supply portion. A joint 24 for attaching the cleaning liquid supply connecting member 22 to the mounting hole 21 is formed at the other end of the cleaning liquid supply connecting member 22.

The joint portion 24 of the cleaning liquid supply connecting member 22 is formed in a rubber bush (grommet) shape having flanges on both sides in the axial direction, and is fitted into the mounting hole 21 of the cover 14 by being pushed in from the outside of the cover 14. .
In this state, the joint portion 24 tightens the opening edge of the mounting hole 21 of the cover 14 by the elastic force of the cleaning liquid supply connecting member 22, so that the joint portion 24 seals the mounting hole 21 in an airtight and liquid tight manner. Yes.

Further, the lower end portion of the cleaning liquid supply pipe 18 is rotatably fitted in the hollow portion of the joint portion 24.
As shown in FIG. 3, the inner circumferential lip 25 of the hollow portion of the joint portion 24 is provided with a plurality of inner annular lips 25 each having a triangular cross section extending in parallel in the axial direction over the entire circumference. The inner annular lip 25 is configured such that the tip thereof is in sliding contact with the outer peripheral surface of the cleaning liquid supply pipe 18.
That is, the front end surface of the inner annular lip 25 and the outer peripheral surface of the cleaning liquid supply pipe 18 are relatively rubbed with each other as the cleaning liquid supply pipe 18 rotates. The seal with the outer peripheral surface of the cleaning liquid supply pipe 18 is maintained.
Further, since the cleaning liquid supply pipe 18 is inserted into the insertion hole 17 of the wiper shaft 16 and inserted into the position of the inner annular lip 25 of the cleaning liquid supply connecting member 22, the assembly is facilitated.
Furthermore, the cleaning liquid supply connecting member 22 can be made difficult to come off by inserting the cleaning liquid supply pipe 18 to a position beyond the mounting hole 21 of the cover 14.

A downstream end portion of a check valve 26 that allows flow only in the direction toward the nozzle 19 is fitted into the connection portion 23 of the cleaning liquid supply connection member 22, and the check valve 26 is caused by the elastic force of the cleaning liquid supply connection member 22. It is fixed to the connecting portion 23 by being tightened.
The downstream end of the tube 27 is fitted into the upstream end of the check valve 26. Although not shown, the upstream end of the tube 27 is cleaned with a cleaning liquid via a pump that is a cleaning liquid supply device. It is connected to the washer tank that is the supply source.

  The operation of the rear wiper device according to the above configuration will be described.

The wiper shaft 16 is reciprocally rotated by forward and reverse rotation of the pinion gear 12 driven by the electric motor 11, and the cleaning liquid is supplied to the tube 27 by the pump while wiping the rear windshield glass by the wiper arm connected to the wiper shaft. Then, since the cleaning liquid is supplied from the cleaning liquid supply connecting member 22 to the cleaning liquid supply pipe 18 through the check valve 26, the nozzle 19 injects the cleaning liquid from the injection port 20 to the rear windshield glass so as to sprinkle with a sprinkler. .
Since the cleaning liquid is sprayed so as to sprinkle with the wiper arm wiping, the cleaning effect on the rear windshield glass is very good.

  According to the embodiment, the following effects can be obtained.

1) The cleaning liquid supply connecting member is integrally molded using rubber or resin, and the check valve is fitted into the connecting portion itself formed by one end thereof, thereby omitting the tube conventionally required for mounting the check valve. Therefore, the number of parts and the number of assembling steps can be reduced.

2) The cleaning liquid supply connection member is integrally molded using rubber or resin, and the joint part for attaching the cleaning liquid supply connection member to the mounting hole is integrally formed at one end of the cleaning liquid supply connection member. Man-hours can be reduced.

3) Fit the joint part of the cleaning liquid supply connecting member into the mounting hole of the cover, and tighten the opening edge of the mounting hole of the cover with the joint part to seal the mounting hole airtight and liquid tight by the joint part. Therefore, airtightness in the gear case can be maintained, and leakage of grease in the gear case can be reliably prevented.

4) An inner annular lip protrudes from the inner periphery of the hollow portion of the joint, and the tip of the inner annular lip is brought into sliding contact with the outer peripheral surface of the cleaning liquid supply pipe. Since the seal can be reliably maintained, leakage of the cleaning liquid from the cleaning liquid supply pipe can be reliably prevented while ensuring the rotation of the cleaning liquid supply pipe.

5) By the above 1) to 4), the manufacturing cost of the rear wiper device having the wiper shaft provided with the nozzle for injecting the cleaning liquid can be greatly reduced.

  Needless to say, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention.

  For example, the cleaning liquid supply connecting member is not limited to the elbow tube shape, and may be formed to a straight tube shape or the like.

  The annular lip on the inner peripheral surface of the hollow part of the joint part is not limited to a plurality of protrusions, but may be one or may be omitted.

  In addition, what connects the connection part 23 of the washing | cleaning-liquid supply connection member 22 and the tube 27 may be what was other than the check valve 26.

  Although the rear wiper device has been described in the above embodiment, the present invention can be applied to all wiper devices such as a front wiper device.

It is a top view which shows the wiper apparatus which is one embodiment of this invention. It is sectional drawing which follows the II-II line of FIG. It is a partially cut front view which disassembles and shows main parts.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Wiper motor, 11 ... Electric motor, 12 ... Pinion gear (power transmission part), 13 ... Gear case, 14 ... Cover, 15 ... Thrust bearing, 16 ... Wiper shaft (output shaft), 17 ... Insertion hole, 18 ... Cleaning liquid supply pipe , 19 ... Nozzle, 20 ... Injection port, 21 ... Mounting hole, 22 ... Cleaning liquid supply connection member, 23 ... Connection part, 24 ... Joint part, 25 ... Inner annular lip, 26 ... Check valve, 27 ... Tube.

Claims (1)

A wiper provided with a bottomed gear case in which a power transmission part for transmitting the rotational force of the motor to the output shaft is housed, a cover covering the opening of the gear case, and a wiper arm attached to one end of the output shaft A device,
A cleaning liquid supply pipe is fitted into an insertion hole opened in the axial direction of the output shaft, and a nozzle having an injection port is provided at one end of the cleaning liquid supply pipe on the wiper arm side,
A cleaning liquid supply connecting member is fitted to the other end of the cleaning liquid supply pipe,
At one end of the cleaning liquid supply connecting member, a joint portion is formed to be fitted into the mounting hole formed in the cover,
A wiper device characterized in that a connecting portion connectable to the cleaning liquid supply portion is integrally formed at the other end of the cleaning liquid supply connecting member.

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