JPH09309383A - Braking force imparting mechanism for vehicular outer mirror device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To press-fit a sliding contact member positively to a rotary shaft while relaxing press-in force and prevent the sliding contact member from cracking by insert-fitting the sliding contact member, provided with press-in wall parts and clearance wall parts at a pressin cylinder part, to the rotary shaft from the axial direction of the rotating shaft. SOLUTION: A rotary shaft 3 supported on a bearing part 6 of a housing 1 fixed to a body is provided with a shaft part 4 with a flange part 5 and a rotation transmission gear 20 mounted thereto. The rotary shaft 3 is rotatable between a service position and a housed position and energized in the direction of coming in pressure contact with the bearing part 6 by the flange part 5. The bearing part 6 is provided with a friction clutch plate 16 for imparting braking force to the rotary shaft 3, and the rotary shaft 3 is provided with a sliding contact member 24 coming in sliding contact with the friction clutch plate 16. This sliding contact member 24 is composed of a facing plate part 24a and a press-in cylinder part 24b, and the press-in cylinder part 24b is formed being provided with press-in wall part 24c brought into close contact with the rotary shaft 3, and clearance wall parts 24d for relaxing press-in force.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a bearing portion formed in a housing fixed to a vehicle body, and a rotary shaft is supported by the bearing portion. An outer mirror for a vehicle, which has a shaft portion to which a rotation transmission gear for transmitting is attached, is rotated between a use position and a storage position, and is urged in a direction in which its flange portion is pressed against the bearing portion. Regarding the improvement of the device.

[0002]

2. Description of the Related Art Conventionally, in a vehicle outer mirror device, a bearing portion is formed in a housing fixed to a vehicle body,
A rotary shaft is supported by the bearing portion, and the rotary shaft has a flange portion that carries an outer mirror and a shaft portion to which a rotation transmission gear that transmits a rotation transmission force is mounted, and is between a use position and a storage position. There is known a structure in which the flange portion is urged in a direction in which the flange portion is pressed against the bearing portion.

In this outer mirror device for a vehicle, a sliding contact plate as a sliding contact member, which is hard-chrome plated for abrasion resistance, is screwed to a flange portion of a rotating shaft, and a friction clutch having a friction material in a bearing portion is provided. The plate is fixed, and a braking force applying mechanism that applies a braking force to the rotating shaft by the pressure contact force of the flange portion to the bearing portion is provided, whereby the blurring of the outer mirror is prevented.

[0004]

However, since the braking force applying mechanism of the conventional outer mirror device has a structure in which the sliding contact plate subjected to the hard chrome plating process is screwed to the flange portion, the fixing is troublesome. And
There is an inconvenience that it takes time to install. Further, there is also a problem that the screw loosens and the sliding contact plate rattles due to a change with time.

The present invention has been made in view of the above circumstances. An object of the present invention is to provide an outer mirror device which has a simple structure and which allows a sliding contact member to be attached to a rotary shaft quickly and without delay. A braking force applying mechanism is provided.

[0006]

In order to solve the above problems, a braking force applying mechanism for an outer mirror device according to the present invention has a bearing portion formed in a housing fixed to a vehicle body, and the rotating shaft is provided in the bearing portion. The rotating shaft has a flange portion carrying the outer mirror and a shaft portion having a rotation transmitting gear for transmitting the rotation transmitting force, and is rotated between a use position and a storage position. In the vehicle outer mirror device in which the flange portion is urged in a direction in which the flange portion is pressed against the bearing portion, a friction clutch plate that applies a braking force to the rotary shaft is provided in the bearing portion,
The rotary shaft is provided with a sliding contact member that is in sliding contact with the friction clutch plate, and the sliding contact member includes a facing plate portion that faces the friction clutch plate, and a press-fitting cylinder portion that is press-fitted into the rotating shaft in the axial direction. The press-fitting cylinder portion includes a press-fitting wall portion that is in close contact with the rotary shaft and a gap wall portion that provides a gap between the press-fitting wall portion and the shaft so as to mitigate the press-fitting force. Preferably, a friction material is provided on one of the friction clutch plate and the facing plate portion of the sliding contact member, and the other is plated with hard chrome. More preferably, the press-fitting wall portions and the gap wall portions are alternately formed around the axis of the rotary shaft, and knurls are formed on the rotary shaft at positions where the press-fitting wall portions are in close contact with each other.

According to the present invention, the sliding contact member is press-fitted into the rotary shaft by inserting the sliding contact member into the rotary shaft from the axial direction of the rotary shaft. The sliding contact member includes
Since the press-fitting cylinder portion is formed and the press-fitting cylinder portion is provided with the press-fitting wall portion and the gap wall portion, when the sliding contact member is press-fitted onto the rotary shaft, deformation of the press-fitting cylinder portion is allowed. The pressure input is alleviated so that the sliding contact member can be reliably pressed into the rotating shaft, and the sliding contact member is prevented from cracking or cracking.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment In FIG. 1, reference numeral 1 is an upper housing containing a drive mechanism, 2 is a lower housing, and 3 is a rotary shaft. The rotating shaft 3 has a shaft portion 4 and a flange portion 5. A bearing portion 6 is provided in the upper housing 1, and 7 is a bearing hole into which the shaft portion 4 of the rotary shaft 3 is inserted. The flange portion 5 is provided with a screw insertion hole 8. The flange portion 5 is covered with a waterproof cover 9. A mounting flange 10 is fixed to the flange portion 5 via a cover 9 by a screw member 11, and a stay 12 carrying an outer mirror (not shown) is fixed to the mounting flange 10. An annular groove 13 is formed on the outer periphery of the bearing portion 6, and
Engagement protrusions 14 are formed. O in the annular groove 13
The ring 15 is fitted and the friction clutch plate 16 is fixed to the engaging projection 14, and the reference numeral 16 ′ indicates a notch having a shape corresponding to the engaging projection 14.

A washer 1 is attached to the shaft portion 4 of the rotary shaft 3.
7, the rotary plate 18, the spring 19, the rotation transmission gear 20, and the clutch plate 21 are inserted. The rotary plate 18 is used for driving and stopping a motor (not shown), and the rotary plate 18 has a rectangular insertion hole 18a and an engaging projection 18b. In the upper housing 1, the limit switch 22 faces the rotation area of the rotation plate 18.
Is provided. As shown in FIG. 2, the shaft portion 4 is formed with a corner portion 4a that fits into the square insertion hole 18a on the protruding base portion that protrudes from the flange portion 5, and an oval-shaped cut portion 4b at the tip portion thereof. It is provided. The clutch plate 21 has an oval-shaped insertion hole 2 corresponding to the cut portion 4b.
1a is provided. An engagement protrusion 21b is formed on the upper surface of the clutch plate 21, and the engagement protrusion 21b is engaged with an engagement recess (not shown) formed on the lower surface of the rotation transmission gear 20. A thread groove 22 is formed at the end of the shaft portion 4, and a nut 23 is screwed into the thread groove 22. The washer 17, the rotary plate 18, and the spring 1
The nut 9, the rotation transmission gear 20, and the clutch plate 21 are prevented from coming off.

The rotary shaft 3 is urged by the urging force of the spring 19 in a direction in which the flange portion 5 is in close contact with the friction clutch plate 16. A sliding contact member 24 is interposed between the friction clutch plate 16 and the flange portion 5 of the rotary shaft 3. The sliding contact member 24 is a friction clutch plate 16
And a press-fitting cylinder portion 24b press-fitted into the rotary shaft 3. The sliding contact member 24 is subjected to a surface treatment with high abrasion resistance, for example, a hard chrome plating treatment for abrasion resistance. Friction clutch plate 16
As shown in the enlarged view of FIG. 3, a friction material plate 16a that gives a frictional force to the facing plate portion 24a is provided by baking. The press-fitting cylinder portion 24b has a linear press-fitting wall portion 24c that is in close contact with the rotary shaft 3 and a curved gap wall portion 24d that alleviates a pressure input. The press-fitting wall portion 24c and the gap wall portion 2
4d are alternately formed in the circumferential direction of the shaft portion 4 of the rotary shaft 3, and the press-fitting cylinder portion 24b is a substantially quadrangular prism having straight side portions and curved corner portions. . As shown in an enlarged view in FIG. 2, the flange portion 5 has a linear close wall portion 5a that closely contacts the press-fit wall portion 24c and a curved facing wall portion 5b that faces the gap wall portion 24d with a gap. The close wall portion 5a has a knurled portion 5 extending long in the press-fitting direction in order to reduce the press-fitting force and absorb variations in the press-fitting margin.
c is formed. The sliding contact member 24 has a flange portion 5.
When the sliding contact member 24 is press-fitted into the flange portion 5, a deforming force is applied in the direction of the arrow F as shown in FIG. 4, and the gap H becomes smaller with the press-fitting. As a result, the press-fitting cylinder portion 24b is allowed to deform, so that the press-fitting force is alleviated and the sliding contact member 24 is securely press-fitted into the flange portion 5. In addition,
Reference numeral 25 is an E ring.

Details of the working relationship of the vehicle outer mirror device are omitted because they are not directly related to the present invention, but if necessary, for example, Japanese Patent Application No. 7-735.
See No. 05.

[0013]

Second Embodiment of the Invention In the second embodiment of the present invention,
As shown in FIG. 5 and FIG. 6, the protruding base portion of the shaft portion 4 is alternately formed with the close wall portions 5a and the facing wall portions 5b, and the close wall portions 5a are formed with knurls 5c. Since the constituent elements are the same as those of the first embodiment of the invention, the same constituent elements are designated by the same reference numerals, and detailed description thereof will be omitted.

According to the first and second embodiments of the present invention, since the press-fitting cylinder portion 24b is composed of the linear press-fitting wall portion and the curved gap wall portion, the rotary shaft 3 and the sliding contact member 24 are connected to each other. It is possible to ensure the integral rotation.

As described above, in Embodiments 1 and 2 of the present invention, the lorette 5c is formed on the close contact wall portion 5a, but the knurl 5c may not be provided. Further, in Embodiments 1 and 2 of the invention, the friction material plate 16a is provided on the friction clutch plate 16, but the friction clutch plate 16 is subjected to hard chrome plating, and the sliding contact member 24
A friction material plate 16a may be provided on the. Further, in the first and second embodiments of the present invention, the gap H is formed at the corner portion of the press-fitting tubular portion 24b having a substantially quadrangular shape. It is also possible to adopt a configuration in which a gap H is provided on the side portion of.

The outer mirror device can be electrically operated between the front storage position in front of the windshield and the set position, and can be electrically operated between the rear storage position and the set position which are on the side of the vehicle. Electric operation is also possible.

[0017]

Since the braking force imparting mechanism of the outer mirror device according to the present invention is constructed as described above, the sliding contact member can be quickly and loosely attached to the rotary shaft with a simple structure. When the slide contact member is press-fitted into the rotary shaft, deformation of the press-fitting cylinder portion is allowed, so that the press input is alleviated and the slide contact member can be securely press-fitted into the rotary shaft, and the slide contact member is not cracked or cracked. To be prevented.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a schematic configuration of a vehicle outer mirror device according to a first embodiment of the invention.

FIG. 2 is an exploded perspective view showing a positional relationship between a rotary shaft and a sliding contact member shown in FIG.

FIG. 3 is an enlarged perspective view showing the shape of the friction clutch plate shown in FIG.

FIG. 4 is a partial cross-sectional view showing a press-fitting relationship between the rotary shaft and the sliding contact member shown in FIG. 1, in which a detailed shape of the rotary shaft is partially omitted.

FIG. 5 is an exploded perspective view showing a schematic configuration of a vehicle outer mirror device according to a second embodiment of the invention.

FIG. 6 is an exploded perspective view showing a positional relationship between the rotary shaft and the sliding contact member shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Upper housing 3 ... Rotating shaft 4 ... Shaft part 5 ... Flange part 6 ... Bearing part 16 ... Friction clutch plate 20 ... Rotation transmission gear 24 ... Sliding contact member 24a ... Face plate part 24b ... Press-fitting cylinder part 24c ... Press-fitting wall part 24d ... Gap wall

Claims (4)

[Claims] 1. A bearing portion is formed in a housing fixed to a vehicle body, and a rotary shaft is supported by the bearing portion. The rotary shaft includes a flange portion carrying an outer mirror and a rotation transmitting gear for transmitting a rotation transmitting force. An outer mirror device for a vehicle, which has a mounted shaft portion, is rotated between a use position and a storage position, and is biased in a direction in which the flange portion is pressed against the bearing portion, A friction clutch plate that gives a braking force to the rotating shaft is provided on the bearing portion, and a sliding contact member that is in sliding contact with the friction clutch plate is provided on the rotating shaft, and the sliding contact member faces the friction clutch plate. The face plate portion and a press-fitting cylinder portion that is press-fitted into the rotary shaft in the axial direction thereof are formed. Braking force application mechanism of outer mirror device for a vehicle and a gap wall portion providing a gap between the bets. 2. The vehicle according to claim 1, wherein a friction material is provided on one of the friction clutch plate and the facing plate portion of the sliding contact member, and the other is plated with hard chrome. A braking force application mechanism for the outer mirror device. 3. The braking force imparting mechanism for a vehicle outer mirror device according to claim 1, wherein the press-fitting wall portions and the gap wall portions are formed alternately in a direction around an axis of the rotating shaft. 4. The braking force imparting mechanism for an outer mirror device for a vehicle according to claim 1, wherein a knurl is formed on the rotary shaft at a position where the press-fitting wall portion closely contacts.