JP2598501Y2 - Electric retractable mirror - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric storage mirror such as a so-called door mirror in which a mirror body is displaceable between a state of protruding and a state of being retracted with respect to a vehicle body by driving a motor. And to facilitate assembly.

[0002]

2. Description of the Related Art An electric storage mirror uses a motor as a drive source, and its rotation is reduced by a speed reducer and transmitted to the mirror body, so that the mirror body protrudes from the vehicle body (use state). It can be displaced to a retracted state (retracted state), and can be displaced to these two states by operating a switch or the like in the vehicle.

In some cases, a worm gear is used as a reduction gear of an electric storage mirror for the purpose of downsizing the device. For example, FIG. 7 shows a reduction device for an electric storage mirror described in Japanese Utility Model Laid-Open Publication No. 3-40252. The rotation of the motor M is transmitted to the worm wheel 62 via the worm 60 attached to the rotation shaft. The worm wheel 62 is provided with a worm 64 coaxially and integrally therewith, and rotation of the worm 64 is transmitted to the worm wheel 66. The worm wheel 66 is provided with a gear 68 coaxially and integrally therewith, and the rotation of the gear 68 is transmitted to the gear 72 via the gear 70. The rotation of the gear 72 is transmitted to a mirror body (not shown) via a clutch mechanism (not shown). By rotating the motor M reversibly, the mirror body can be displaced between the two states.

[0004] The worm wheel 62 and the worm 64 are integrally formed on a shaft 74. Since a thrust load accompanying the driving of the mirror body is applied to the shaft 74, steel balls 76, 7 are attached to both ends 74a, 74b.
8 is supported by a bearing (not shown) in the mirror body by abutment, thereby ensuring smooth rotation of the worm wheel 62 and the worm 64 in the direction around the shaft 80.

[0005]

According to the speed reducer shown in FIG. 7, the shaft 74 having the worm 64 has the opposite ends 7a and 7b.
Since the steel balls 76 and 78 rotate while being in contact with the steel balls 4a and 74b, both ends 74a and 74b of the shaft 74 are worn due to friction with the steel balls 76 and 78. This abrasion causes play in the shaft 74 in the axial direction, so that the mirror body becomes stiff during driving of the vehicle, thereby causing problems such as deterioration of the rear visibility. Also,
When assembling this reduction gear, steel balls 76, 78
Since it is difficult to insert the steel balls 76 on both sides of the shaft 74, the steel balls 76 and 78 are likely to fall off.

This invention is intended to solve the above-mentioned problems in the prior art and to provide an electric retractable mirror which prevents the mirror body from rattling and facilitates assembly.

[0007]

According to the present invention, recesses are formed at both ends of a shaft having a worm, steel balls are respectively accommodated in these recesses, and steel balls are pressed against the inner peripheral surface of the recesses. By holding
Fix the steel balls to both ends of the shaft,
The thrust load applied to the shaft is supported by the bearing via these steel balls.

[0008]

According to the present invention, since the steel balls are fixed to both ends of the shaft, no friction occurs between the end of the shaft and the steel balls. It is possible to prevent deterioration of the rear visibility due to rattling of the body. Further, since the steel ball is fixed to the end of the shaft, the steel ball does not fall off when the speed reducer is assembled, so that the assembling work is facilitated. In addition, since a steel ball is fixed to the end of the shaft, the hardness and sphericity can be increased as compared with the case where the end of the shaft itself is formed into a spherical shape, and the smooth rotation of the shaft can be maintained for a long time. Can be.

[0009]

An embodiment of the present invention will be described below. FIG.
FIG. 1 is a partially cutaway front view showing an entire configuration of an electric storage door mirror to which the present invention is applied. The electric storage door mirror 10 has a shaft 13 fixed substantially vertically to an overhang portion 12 of a base 11 fixed to a vehicle door (not shown). A frame 14 is rotatably supported by the shaft 13, and a mirror body 15 is fixed to the frame 14. The mirror stay 15 is rotated around the shaft 13 together with the frame 14 to protrude from the body of the vehicle in use (the state shown in FIG. 2).
And can be displaced to a state at the time of retracted storage (a state rotated about 90 ° forward from the state of FIG. 2).

Inside the mirror body 15, a drive motor M and a speed reducer 48 having a clutch mechanism are provided. The configuration of the speed reducer 48 is shown in FIG. FIG. 4 is an exploded perspective view thereof. In FIG. 3 or FIG. 4, the speed reducer 4
A box 17 for accommodating 8 is formed. A cover 16 is screwed to the box 17. Box 1
Bearings 51 and 52 are provided on the inner wall surfaces of the cover 7 and the cover 16.
Is rotatably supported.

A round hole 19 is formed in the bottom portion 18 of the box 17, and the frame 14 is rotatably supported by the shaft 13 by passing the shaft 13 through the round hole 19. The side surface of the shaft 13 has a chamfered portion 20 and grooves 22,5.
0 is formed. With the shaft 13 passed through the round hole 19, the washer 24, the worm wheel 25, the clutch guide 26, the clutch plate 2
8, the coil spring 29 and the washer 30 are sequentially inserted, and the U-plate 21 is inserted into the groove 22 from above, so that these components 24, 25, 26, 28,
29, 30 are mounted on the shaft 13. In this state,
The worm wheel 25 meshes with the worm 46. The frame 14 and the worm wheel 25 are rotatable with respect to the shaft 13, but the clutch guide 26
Cannot rotate because the shaft 13 is passed through the chamfered hole 26a. Further, the clutch plate 28 cannot rotate since the claw 27 at the lower end thereof is fitted into the groove 26b of the clutch guide 26. The lower end of the claw 27 fits into a groove 25 b formed on the upper surface of the worm wheel 25. The clutch plate 28 is urged downward by a coil spring 29, and when no external force is applied to the frame 14 in the direction around the shaft 49, the pawl 27 is fitted and locked in the groove 26 b of the worm wheel 26. Therefore, the worm wheel 25 is integrated with the clutch plate 28 and the clutch guide 26 and cannot rotate with respect to the shaft 13. When an external force is applied to the frame 14 in the direction around the shaft 49, the worm wheel 25 tries to rotate around the shaft 13 while engaging with the worm 46, and the clutch plate 28 moves upward against the urging force of the spring 29. Then, the pawl 27 is disengaged from the groove 25b of the worm wheel 25, and the worm wheel 25 can rotate around the shaft 13, whereby the frame 14 rotates around the shaft 49.

The outer plate 3 is placed on the box 17.
2 are attached by screws 31. At this time,
The shaft 13 passes through a round hole 33 formed in the upper surface 34 of the outer plate 32. A stopper plate 38, a disc spring 42, and a washer 43 are passed through the shaft 13, and the U plate 44 is fitted into the groove 50 of the shaft 13 from above.
3 is mounted on the shaft 13. In this state, the outer plate 32 is rotatable with respect to the shaft 13, but the stopper plate 38 is not rotatable because the shaft 13 is passed through the chamfered hole 37. The disc spring 42 applies a downward biasing force to the stopper plate 38. In the upper surface 34 of the outer plate 32, recesses 40 are formed at equal intervals around a shaft 49, and steel balls 41 are accommodated therein. A concave portion 39 is also formed on the lower surface of the stopper plate. By rotating the outer plate 32 around the shaft 49, the steel ball 41 escapes from the recess 39 while being accommodated in the recess 40, and slides on the lower surface of the stopper plate 38.

A circular hole 36 is formed in the lower surface 35 of the outer plate 32, and the worm 45 attached to the shaft of the motor M is inserted into the circular hole 36.
5 is attached. In this state, the worm 45 is engaged with the worm wheel 53.

According to the above configuration, when the motor M is driven, the rotation thereof is performed by the worm 45, the worm wheel 53,
The worm 46 is transmitted to the worm wheel 25.
At this time, the worm wheel 25 is not allowed to rotate because the claws 27 of the clutch plate 28 are engaged with the grooves 25b, so that the shaft 54 having the worm 46 revolves around the worm wheel 25, and the frame 14 rotates around the shaft 49 to displace the mirror body with respect to the vehicle body.

Further, by applying an external force in the direction around the shaft 49 to the frame 14 by hand or the like without driving the motor M, the claws 27 of the clutch plate 28 The frame 14 rotates in the direction around the shaft 49, coming off the groove 25b.

FIG. 1 shows the configuration of a shaft 54 to which the present invention is applied. The worm wheel 53 and the worm 46 are integrally formed on the shaft 54. Concave portions 55, 56 are formed at both ends of the shaft 54, and steel balls 57, 58 are accommodated therein. Open ends 55a, 56b of peripheral wall portions 55b, 56b of the concave portions 55 , 56 are formed.
By caulking the 56a inside, the recesses 55 and 56
Steel balls 57 are formed on inner wall surfaces of the peripheral wall portions 55b and 56b .
58 is pressed and held. Both ends of the shaft 54 are housed in bearings 51 and 52 and support the shaft 54 so as to be rotatable around its axis. When the motor M is driven, the entire shaft 54 rotates around its axis.
At this time, the shaft 54 receives a thrust load due to a reaction when the worm 46 drives the worm wheel 25 to rotate.
Since it is supported by bearings 51 and 52 via 8, it can rotate smoothly. In addition, since the shaft 54 and the steel balls 57 and 58 are fixed, it is possible to prevent the end portions of the shaft 54 from being consumed by the steel balls 57 and 58.

Steel balls 5 are provided at both ends of the shaft 54.
FIG. 5 shows an example of a process for mounting 7,58. First,
As shown in FIG. 5, a metal shaft 5 having a worm wheel 53 and a worm 46 and having concave portions 55 and 56 formed at both ends.
4 and steel balls 57 and 58 are prepared. And
The steel balls 57, 58 are
And the peripheral wall portions 5 of the concave portions 55 and 56 as described above.
The steel balls 55 and 56 are fixed to both ends of the shaft 54 by caulking the open ends 55a and 56a of the shafts 5b and 56b inward. 1 is assembled with the steel balls 55 and 56 fixed, so that the steel balls 57 and 58 can be prevented from falling off during assembly.

[0018]

[Modification] Recesses 55 and 5 formed at the tip of shaft 54
6 is not limited to the spherical shape as shown in the above embodiment, but may be a cylindrical shape such as the concave portions 55 and 56 shown in FIG. 6 or other various shapes.

[0019]

As described above, according to the present invention, since the steel balls are fixed to both ends of the shaft, no friction occurs between the ends of the shaft and the steel balls. Wear is prevented,
It is possible to prevent the rear visibility from deteriorating due to the rattling of the mirror body. Further, since the steel ball is fixed to the end of the shaft, the steel ball does not fall off when the speed reducer is assembled, so that the assembling work is facilitated. In addition, since a steel ball is fixed to the end of the shaft, the hardness and sphericity can be increased as compared with the case where the end of the shaft itself is formed into a spherical shape, and the smooth rotation of the shaft can be maintained for a long time. Can be.

[Brief description of the drawings]

FIG. 1 is a view showing an embodiment of the present invention, showing a structure of a shaft 54 shown in FIGS.

FIG. 2 is a partially broken front view showing the entire configuration of the electric retractable mirror to which the present invention is applied.

FIG. 3 is an enlarged view of a motor and a speed reducer in FIG. 2;

FIG. 4 is an exploded perspective view of the motor and the speed reducer of FIG.

FIG. 5 shows steel balls 57, 5 attached to the shaft 54 of FIG.
It is a figure which shows the example of a process of attaching 8.

FIG. 6 is a diagram showing a modified example of the shape of the concave portions formed at both ends of the shaft 54.

FIG. 7 is a perspective view showing a conventional device.

[Explanation of symbols]

15 Mirror body 46 Worm 48 Reducer 54 Shaft 55 , 56 Recess 55a, 56a Open end 55b, 56b Recess peripheral wall 57, 58 Steel ball M Motor

Claims (1)

(57) [Scope of request for utility model registration] A mirror body disposed so as to be displaceable between a use state and a retracted state with respect to a vehicle body, a motor for driving the mirror body, and a motor for reducing the rotation of the motor. And a speed reducer for transmitting the mirror body to the mirror body by displacing the mirror body into the two states, wherein the speed reducer has a worm, and the worm has steel balls at both ends of its shaft. recess for storing are formed respectively, the peripheral wall of the recess being caulked its open end inwardly
Is formed as thin as possible, and the depth of the concave portion is
Make the steel ball deeper than the hemisphere and shallower than the whole sphere
Is formed to a depth of Ku housing, stores the steel balls each of these recesses, the
By crimping the open end of the peripheral wall portion of the concave portion inward and holding these steel balls in pressure contact with the inner peripheral surface of the concave portion, the steel ball is placed on both ends of the shaft.
An electric motor which is fixed in a state where a part thereof is projected to the outside, supports a thrust load applied to the shaft to a bearing portion via the steel ball, and supports the shaft rotatably around its axis. Storage mirror.