JPH0687074U - Electric mirror - Google Patents

Abstract

(57) [Abstract] [Purpose] By eliminating the additional work after the engagement clutch and the sun gear have been sintered, the cost of these mechanical parts is reduced and a cheaper electric mirror is obtained. The engaging clutch 34 formed by sintering is provided with a plurality of engaging protrusions 50, a connecting portion 34a is provided between the engaging protruding portions 50, and the connecting portion 34a has an outer side. The gear support portion 34b is provided on the inside, and the engaging cutout portion 3 is provided inside.
4c and the peripheral notch 34e is provided outside the engaging protrusion 50. On the other hand, the sun gear 35 is provided with a plurality of rotation supporting portions 54 inside a cylindrical portion 35a having a tooth portion 52 formed on the outer periphery thereof, and an engaging recess 55 is provided between the rotation supporting portions 54, so that the cylindrical portion An inner peripheral protrusion 35b is provided between the rotation support parts 54 at the upper edge of the inner periphery of the 35a.
A chamfered sliding edge portion 35c is provided on the lower side edge portion of No. 4, and the engagement clutch 34 and the sun gear 35 are formed by sintering.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an electric mirror installed in an automobile or the like.

[0002]

[Prior art]

 Electric side mirrors that can be folded and installed on the doors of automobiles are generally used in a state that they project to the side of the vehicle body.In this state, the mirror body should not interfere with passersby when the vehicle is stopped. Alternatively, the mirror body is mounted on the vehicle body so as to be rotatable between the use position and the storage position along the vehicle body so as not to come into contact with an obstacle and be damaged.

The supporting portion of the side mirror includes a base shaft fixed to the vehicle body, an engagement clutch that is locked to the base shaft and externally fitted in a non-rotatable state, and an upper portion of the engagement clutch. Is externally fitted to the base shaft, and is basically composed of an engaging projection provided on the engaging clutch and a sun gear engaged with the engaging clutch. The side mirror is rotated around the sun gear to a storage position or a use position. To do.

As shown in FIG. 15, the engagement clutch 130 is conventionally provided with a shaft hole 132 provided at the center of the base member 131 and a radial projection along the periphery of the shaft hole 132. The shaft hole 132 is formed in a different-diameter cross-sectional shape that engages with the base shaft.

Further, as shown in FIG. 16, the sun gear 140 has gear teeth 141 on the outer periphery, a circular shaft hole 142 through which the base shaft is inserted, and a center of the engagement clutch 130. The sun gear had a plurality of engagement holes 143 for engaging the engagement protrusions 133, and this sun gear was also made of a sintered material like the engagement clutch.

[0006]

[Problems to be solved by the device]

 According to the shape of the conventional engaging clutch 130 as shown in FIG. 15, the thickness of each part of the base member 131 and the engaging projection 133 is different, and when the sintering is performed with this shape, the pressure distribution is It became non-uniform and the density of the powder particles became unbalanced, and it was not possible to obtain an engaging clutch that satisfied the required conditions such as mechanical strength. Therefore, the engagement clutch 130 is first deformed into a shape having less unevenness as compared with the required shape and sintered, and then subjected to various additional processes to obtain the required shape to satisfy the above required conditions. I made an engagement clutch.

In addition, the sun gear 140 as shown in FIG. 16 has a complicated shape in which the engagement hole 143 is formed in a cutout hole shape independently of the shaft hole 142. Therefore, additional work after sintering was inevitable.

As described above, the engagement clutch and the sun gear need additional processing after sintering, which makes it difficult to reduce the cost of these mechanical parts.

The present invention has been made in view of the above circumstances, and it is possible to provide a low-cost mechanical component by eliminating the additional machining of the mechanical component made of a sintered material as much as possible to provide an inexpensive mechanical component. The purpose is to provide a mirror.

[0010]

[Means for Solving the Problems]

 According to a first aspect of the present invention, there is provided a support shaft projecting from a vehicle body, an engagement clutch made of a sintered material, which is engaged with the support shaft, a sun gear which is engaged with the engagement clutch, and the support. In an electric mirror having a mirror main body rotatably attached to an engagement gear, the engagement clutch is adjacent to a plurality of engagement protrusions engaged with engagement recesses formed in the sun gear. A connecting portion for connecting the engaging protrusions to each other is provided, and a gear supporting portion for supporting the sun gear and a locking recess for locking the supporting shaft are formed in the connecting portion and are adjacent to each other. A peripheral notch formed by notching the outer portion of the engaging protrusion is formed between the connecting portions.

According to a second aspect of the present invention, there is provided a support shaft projecting from the vehicle body, an engagement clutch engaged with the support shaft, and a sun gear made of a sintered material, which is engaged with the engagement clutch. In the electric mirror having a mirror body rotatably attached to the sun gear, the sun gear has a cylindrical portion having teeth formed on the outer periphery thereof, and a predetermined gap is provided on the inner surface of the cylindrical portion. It has a plurality of projecting rotation support parts, an engagement recess of a predetermined width formed between the rotation support parts, and an inner peripheral projection part projecting at the upper end of the engagement recess. A chamfered sliding edge portion is formed on the lower portion of the rotation support portion.

[0012]

[Action]

 According to the invention of claim 1, a peripheral notch is provided on the outer side of the engaging protrusion protruding upward, and a gear support is provided at the connecting part and a locking recess is provided at the connecting part. As a result, the wall thickness is made uniform, the pressure distribution balance during sintering in each part of the engaging clutch is maintained, and the density of the powder particles is made uniform, satisfying the required conditions such as mechanical strength. Is obtained.

According to the second aspect of the present invention, the rotation supporting portion is provided on the inner surface of the cylindrical portion having the tooth portion on the outer periphery at predetermined intervals over the entire area in the thickness direction of the gear, and the inner peripheral protruding portion is rotated. The sun gear rotates with respect to the engaging clutch because the sliding gears are provided at the upper ends between the dynamic support parts, and the lower edges of the rotary support parts are chamfered. In the case of dynamic displacement, the sliding edge can be slid smoothly on the engaging projection. Further, when the sun gear is mounted upside down with respect to the normal state, the engaging protrusion and the inner peripheral protrusion contact with each other to prevent erroneous assembly. Further, since the shape is relatively simple while realizing the above-mentioned functionality, it is possible to obtain a sun gear satisfying the required requirements only by sintering, and no additional work is required after sintering.

[0014]

Embodiment An embodiment of the present invention will be described with reference to the drawings. Although the electric mirror mounted on the right side of the vehicle body is described in this embodiment, the present invention can be similarly applied to the mirror mounted on the left side of the vehicle body.

In FIGS. 1 and 2, reference numeral 10 denotes a mirror body, and the mirror body 10 has a drive case 12. The drive case 12 has a mirror mounting portion 13, and the mirror is mounted on the mirror mounting portion 13.

A base 11 is fixed to the vehicle body side. A base shaft (support shaft) 14 protruding upward is formed on the base 11, and the base shaft 14 has a cylindrical shape having a through hole 15 in the center. The mirror body 10 is mounted so as to be rotatable about the base shaft 14 as an axis, and a rotation drive mechanism for driving the mirror body 10 is provided in the drive case 12.

This rotation drive mechanism is shown in FIG. This mechanism includes an electric motor 16, a worm 17 fixed to the drive shaft of the motor 16, a worm gear 19 and a gear 20 formed on the same vertical shaft 18, and a same vertical shaft 21. The gears 24, 25, 26, 27 are rotatably supported by the same vertical shaft 22, and planetary gears 28 are provided. Each of them is a double gear having a large-diameter gear 24a, 25a, 26a, 27a and a small-diameter gear 24b, 25b, 26b, 27b at the top and bottom.

As shown in FIG. 1, the upper end of the vertical shaft 18 is rotatably supported by the motor mounting plate 30, and the lower ends of the vertical shafts 21 and 22 are fixed to the drive case 12. Is rotatably supported by an upward protruding portion 29 formed on the drive case 12. The worm 17 meshes with the worm gear 19, and similarly, the gear 20 has a large diameter gear 26a, the small diameter gear 26b has a large diameter gear 24a, the small diameter gear 24b has a large diameter gear 27a, and the small diameter gear 27b has a large diameter gear. Small diameter gears 25b are meshed with the gears 25a and planetary gears 28, respectively. Thus, the speed reducing mechanism is configured, and by this mechanism, the driving force of the motor 16 is converted into the rotational force of the planetary gear 28 around the projecting portion 29.

As shown in FIG. 4, the base shaft 14 has a lower large-diameter portion 14a and an upper small-diameter portion 14b, and the lower large-diameter portion 14a has a locking projection 14c protruding upward. And a stopper locking groove 14d is formed near the end of the upper small diameter portion 14b along the outer peripheral surface thereof. The base shaft 14 includes a washer clutch 32, the drive case 12, the engaging clutch 34, a sun gear 35, a lever washer 36, a ring-shaped seat 38, a spring 40, and a spring seat in order from the bottom. 42 and a spring stopper 44 are attached, and the cover 45 is attached to the drive case 12 from above the respective mechanical components.

The washer clutch 32 is locked in a recess (not shown) provided in the bottom surface of the drive case 12 by a claw 33 provided on the peripheral edge of the washer clutch 32. A pair of protrusions 46 are formed on the lower surface of the washer clutch 32 at two positions separated from each other by 180 °. On the other hand, the restriction groove 48 having a width into which the protrusion 46 can be fitted is provided on the base 11 around the base shaft 14 in a recessed manner. Each control groove 48 has an arc shape with a central angle of about 60 ° to 70 ° as shown in FIG. 7.

When the mirror body 10 reaches the use position as shown by the alternate long and short dash line in FIG. 2, both protrusions 46 contact the side wall of one end of each restriction groove 48 as shown by the solid line in FIG. When the mirror body 10 reaches the storage position as indicated by the chain double-dashed line in FIG. 2, both protrusions are in contact with the side walls of the other end of each regulation groove 48 as indicated by the double-dashed line in FIG. As described above, the mounting angle position of the washer clutch 32 with respect to the mirror body 10 is set, and the rotation range of the mirror body 10 is restricted between the use position and the storage position by each of the abutments. There is.

However, when an unexpectedly large torque load is applied to the mirror body 10, the protrusion size and the protrusion shape of each protrusion 46 are set so that each protrusion 46 rides up to the outside range of the restriction groove 48. .

Further, the engaging clutch 34 is integrally formed of a sintered material, and as shown in FIG. 5, the engaging clutch 34 has a plurality of protrusions arranged at regular intervals in the circumferential direction and protruding upward (in the example shown in the figure). 3) engaging protrusions 50, connecting portions 34a for connecting the adjacent engaging protrusions 50 to each other, gear support portions 34b protruding outward from each of the connecting portions 34a, and It comprises a recessed engagement recess 34c and a peripheral notch 34e formed between the adjacent gear supports 34b (outside of the engagement protrusion 50).

Spaces 51 are formed between the engaging protrusions 50, respectively, so that a rotation support portion, which will be described later, is engaged with the space portions 51. As shown in FIG. 8, a first inclined surface 50a and a second inclined surface 50b are formed on both end surfaces of the engaging protrusion 50.

On the other hand, the locking concave portion 34c is engaged with the locking convex portion 14c (see FIG. 4) of the base shaft 14 so that the locking concave portion 34c is fixed to the base shaft 14 so as not to rotate relative to the base shaft 14. There is.

The sun gear 35 to be engaged with the engagement clutch 34 is formed of a sintered material, and has a cylindrical portion 35a having teeth 52 formed on the outer peripheral surface thereof and a cylindrical portion 35a protruding from the inner peripheral surface at predetermined intervals. The rotary support portion 54 and the like are basically configured (see FIG. 9). The rotation support portion 54 has a width dimension that can be fitted in the space 51 of the engagement clutch 34, and the lower side edge portion of the rotation support portion 54 is chamfered to have a roundness. A slidable edge portion 35c is provided.

An engaging recess 55 having a width dimension that allows the engaging protrusion 50 to be engaged is formed in an arc shape along the outer peripheral surface of the gear between the rotation supporting parts 54. As shown in FIG. 9, the upper edge of the arcuate surface (opposite to the sliding edge 35c) is provided with an inner peripheral projection 35b projecting a predetermined amount inward of the engaging recess 55. Has been formed.

In other words, by providing the inner peripheral projection 35b, when the surface on which the inner peripheral projection 35b is provided faces the engagement clutch 34 and the sun gear 35 is to be mounted, the engagement projection is provided. 50 contacts the inner peripheral projection 35b to prevent the sun gear 35 from being reversely engaged with the engagement clutch 34.

The lever washer 36 has a lever portion 57 protruding outward in the horizontal direction (radial direction of the base shaft 14), and a through hole 56 is vertically formed at an end portion of the lever portion 57. ing. The lower surface of the ring-shaped sheet 38 is in contact with the upper surface of the lever washer 36, but the ring-shaped sheet 38 is subjected to a surface treatment such as teflon processing so that the ring-shaped sheet 38 has a ring-shaped shape. The coefficient of friction between the seat 38 and the spring 40 has been significantly reduced compared to the coefficient of friction between the seat 38 and the lever washer 36, and the lever washer 36 has priority over the spring 40 over the sun gear 35 and is integrated therewith. It is in a state of being rotationally displaced.

Then, the washer clutch 32, the drive case 12, and the engaging clutch 34 are sequentially fitted onto the lower large diameter portion 14 a of the base shaft 14. Further, the sun gear 35 is oriented such that its sliding edge portion 35c is on the engagement clutch 34 side, and then the rotation support portion 54 is fitted into the space portion 51 of the engagement clutch 34 while the base shaft 14 is being engaged. The tooth portion 52 of the sun gear 35 is meshed with the planetary gear 28 at the same time. Further, a lever washer 36, a seat 38, a spring 40, and a spring seat 42 are sequentially fitted onto the upper small-diameter portion 14b, and further, both linear portions of a U-shaped spring stopper 44 are connected to a stopper engaging portion of the base shaft shown in FIG. By being inserted into the stop groove 14d, the drive case 12 and the like are mounted while being pressed against the base 11 side by the elastic force of the spring 36.

By being assembled in this way, the planetary gear 28 is rotationally driven and revolves around the sun gear 35 as it rotates. Further, only when a torque larger than a predetermined value is applied to the sun gear 35, the above-mentioned rotation support portion 54 moves up the first inclined surface 50a as shown by the chain double-dashed line in FIG. 8 (see the arrow in FIG. 8). ), The engaging clutch 34 and the base shaft 14 are rotationally displaced. When the sun gear 35 is rotated and displaced, the sliding edge portion 35c is formed on the lower edge portion of the rotation support portion 54, so that the rotation support portion 54 can smoothly move on the inclined surfaces 50a and 50b. It is like this.

Further, as shown in FIG. 4, the three-position slide switch 58 which is switched by the rotational displacement is located laterally of the base shaft 14, that is, at a position deviated from the central axis of the base shaft 14 in the radial direction thereof. It is arranged. The slide switch 58 is fixed to the drive case 12 by screwing both mounting portions 58h with screws 62. A printed circuit board 60 described later is attached to the terminal 58d side of the slide switch 58.

From the lower surface of the slide switch 58, as shown in FIGS. 4 and 6, an operation portion 64 that is slidable in the left-right direction is projected, and this operation portion 64 corresponds to the lever portion 57 of the lever washer 36. The operating portion 64 is inserted through the through hole 56 from above, and the operating portion 64 is displaced in the left-right direction integrally with the lever portion 57. On the other hand, on the side of the drive case 12, as shown in FIG. 10A, the lower space portion 66 and the side space portions 67 and 68 for allowing the operation portion 64 and the lever portion 57 to be displaced. Are formed. The inner wall 12a forming the lateral space portions 67 and 68 is formed in an inclined shape so as to approach the center side as it approaches the lower space portion 66, and the lower end of the inner wall 12a is the inner wall of the lower space portion 66. It is connected to 12b.

By forming the side space portions 67 and 68 as described above, the lever portion 57 that has been displaced in either the left or right direction is returned to the center with a vigorous force, and overruns to cause the inner wall 12a on the opposite side to overrun. The inner wall 12a is slid down and returned to the lower space portion 66 even when riding on the vehicle.

As shown in FIG. 11, the slide switch 58 guides the terminal fixing portion 58a to which the terminal 58d is fixed, the slide portion 58b on which the operating portion 64 is provided, and the slide portion 58b. The case 58c is basically configured. Three metal pieces are fixed to the terminal fixing portion 58a formed of an electric insulator so as to project into the inside and the outside of the switch, and the portion protruding inside the switch has contact terminals 91, 92 and 93, the portion projecting to the outside of the switch is connected to the wiring of the drive circuit as the terminal 58d.

The slide portion 58b is formed with a through hole 58k, a groove portion 58e in which a contact plate 94 for switching the contact terminals 91, 92, 93 to a short or open state is mounted, an operating portion 64 and the like. . A spring 58f is inserted into the through hole 58k, and the ball 58g is mounted in the through hole 58k from above and below against the elastic force of the spring 58f.

On the outer surface of the case portion 58c, a mounting portion 58h having a mounting hole formed therein, an opening portion 58i through which the operation portion 64 is inserted, and the like are formed. Further, when the slide portion 58b is mounted inside the case portion 58c, a positioning portion 58j formed by unevenness is formed on each inner wall facing the two balls 58g.

As shown in FIG. 12, the positioning portion 58j includes three protrusions 120, 121, 122 that are provided in the inner surface of the case portion 58c so as to protrude in the central direction, and these protrusions 120, 121, 122. It is composed of two concave portions 123 and 124 formed between them and a concave portion 125 formed at the center of the convex portion 120. An inclined surface 126 having a predetermined inclination angle is formed between the central convex portion 120 and the concave portions 123 and 124 located on both sides thereof.

Since the positioning portion 58j is configured as described above, when the position of the sliding portion 58b is the central position among the three positions, the ball 58g enters the central concave portion 125 and the sliding portion 58b moves to the left and right. When it is located at either position, the ball 58g will enter either of the recesses 123 and 124. That is, since the ball 58g is pressed by the resilient force of the spring 58f into the concave portions at the respective positions, the slide portion 58b is stably positioned.

In particular, as shown in FIG. 12B, even if the sliding operation is interrupted while the ball 58g remains on the slope 126, the sliding portion 58b has a spring force of the spring 58f. By the action with the ball 58g, a force in the direction indicated by the arrow A acts, and as a result, the slide portion 58b comes to a predetermined position as shown in FIG. 12 (c).

Since the slide switch 58 is provided with a positioning mechanism composed of the above-described positioning portion 58j, spring 58f, and ball 58g, when the slide switch 58 is used as an electric mirror, The contact failure of the contact terminal due to vibration of the can be greatly suppressed. Even if the sliding portion 58b moves relatively slowly, the sliding force suppresses the sparks between the contact terminals 91, 92, 93 and the contact plate 94 and suppresses the burnout of the contacts. The slide switch 58 can have a long life.

Next, the drive circuit of the motor 16 will be described with reference to FIG.

As shown in FIG. 10A, when the end portion of the lever portion 57 and the operating portion 64 are located in the central lower space portion 66, that is, when the sun gear 35 is not rotationally displaced, The contact plate 94 contacts all the contact terminals 91 to 93 as shown in FIG. 13, and a part of the end of the lever part 57 escapes into the lateral space 67 as shown in FIG. 10B. That is, when the sun gear 35 receives torque and is rotationally displaced in the clockwise direction shown in FIG. 2, the contact plate 94 contacts only the contact terminals 91 and 92, and conversely, as shown in FIG. As described above, in a state where a part of the end of the lever portion 57 escapes into the lateral space portion 68, that is, in a state where the sun gear 35 receives torque and is rotationally displaced in the counterclockwise direction shown in FIG. So that the contact plate 94 contacts only the contact terminals 92, 93, A contact plate 94 of the slide switch 58 and contact terminals 91, 92, 93 are configured.

As shown in FIG. 13, one terminal of the motor 16 is connected to the contact terminal 91 via the diode 101 and the contact terminal 93 via the diode 102. Is connected to the contact plate 94 via a resistor (not shown), a pair of switches 107 and 108, and a power supply 110. Both switches 107 and 108 have movable terminals interlocking with each other, and are provided on the door side of the vehicle body.

Wiring between the slide switch 58 and the diodes 101 and 102 is provided on the printed circuit board 60.

Then, by manually switching the switches 107 and 108 to the two-dot chain line state of FIG. 13, the motor 16 is rotated in the forward direction on condition that the contact terminals 92 and 93 and the contact plate 94 come into contact with each other. The drive circuit can be switched to a state in which the contact circuits 91 and 92 are brought into contact with the contact plate 94 by switching the switches 107 and 108 to the solid line state in the figure. The drive circuit can be switched to a state in which the motor 16 is operated in the reverse direction.

Here, the “forward direction” with respect to the operating direction of the motor 16 means a direction in which the motor 16 rotates the mirror body 10 from the storage position to the use position through the rotation of the planetary gear 28. The "reverse direction" means a direction in which the mirror body 10 is rotated from the use position toward the storage position.

Next, the operation of this electric mirror will be described.

First, when the mirror main body 10 of the electric mirror is in the retracted position in the state where the torque equal to or greater than the limit torque is applied due to the driving to the retracted position before this, the lever portion 57 moves to the position shown in FIG. As shown in (c), it is in a state where it has escaped into the lateral space 68, and the contact plate 94 of the slide switch 58 is in contact with the contact terminals 92, 93. Therefore, by switching the switches 107 and 108 to the two-dot chain line position in FIG. 13 in this state, the motor 16 is energized to operate in the forward direction, and the driving force thereof causes the planetary gear 28 to be shown in FIG. 14 (a). As shown in the figure, by rotating counterclockwise in the figure and revolving around the sun gear 35, the mirror body 10 rotates together with the planetary gear 28 in the direction from the retracted position to the use position.

Then, when the mirror body 10 reaches the use position, each protrusion 46 of the washer clutch 32 abuts on one end of the restriction groove 48 as shown by the solid line in FIG. Although the rotation is restricted, only the planetary gear 28 is forcibly driven to rotate. As a result of this rotation, as shown in FIG. 14 (b), a torque above the limit torque in the clockwise direction in FIG. 14 acts on the sun gear 35, and as shown in FIG. 8, the rotation support portion 54 moves on the first inclined surface 50a. The sun gear 35 slides and is rotationally displaced around the base shaft 14 in the torque direction. Along with this displacement, the lever portion 57 and the operating portion 64 of the lever washer 36 are also displaced with respect to the base shaft 14 into the state shown in FIG. 10B, and the contact between the contact plate 94 and the contact terminal 93. The driving of the motor 16 is stopped because there is no longer any. As described above, since the rotation of the mirror body 10 is restricted, only the planetary gear 28 is forcibly driven to rotate, and the motor 16 is stopped. The backlash between 28 and 35 is reduced, and the backlash of the mirror body 10 due to this backlash does not occur.

In this state, the contact plate 94 shown in FIG. 13 is in contact with the contact terminals 91 and 92. Therefore, by switching the switches 107 and 108 to the positions indicated by the solid lines in FIG. 13 from this state, the motor 16 is energized and operates in the opposite direction, and the driving force thereof causes the planetary gear 28 to move in the opposite direction (in FIG. 14). By rotating in the clockwise direction) and revolving around the sun gear 35, the mirror body 10 rotates together with the planetary gear 28 in the direction from the use position to the storage position.

Then, when the mirror body 10 reaches the retracted position, each protrusion 46 of the washer clutch 32 comes into contact with the other end of the restriction groove 48 as shown by the chain double-dashed line in FIG. Although the rotation of 10 is restricted, only the planetary gear 28 is forcibly driven to rotate. As a result of this rotation, as shown in FIG. 14 (c), a torque above the limit torque in the counterclockwise direction in FIG. 8 acts on the sun gear 35, and the sun gear 35 moves toward the position opposite to the position indicated by the two-dot chain line in FIG. The rotation support portion 54 slides on the first inclined surface 50a, and the sun gear 35 is rotationally displaced around the base shaft 14 in the torque direction. Along with this displacement, the lever portion 57 and the operating portion 64 of the lever washer 36 are also displaced relative to the base shaft 14 and become in a state as shown in FIG. Therefore, the drive of the motor 16 is stopped.

When the torque greater than the limit torque is not applied to the sun gear 35, the lever portion 57 is located in the lower space portion 66, and the contact plate 94 contacts all the contact terminals 91, 92, 93. Therefore, by switching the switches 107 and 108 as described above, the switch can be rotated to either the use position or the storage position.

By the way, in such an electric mirror, since the engagement clutch 34 is formed as described above, its molding is simplified. That is, as shown in FIG. 5, the peripheral notch 34e is provided outside the engaging protrusion 50, the connecting portion 34a is provided with the gear support portion 34b on the outer side thereof, and the inner side thereof is used for locking. By providing the concave portion 34c, the difference in wall thickness of the entire engagement clutch 34 is reduced, and the wall thickness is made uniform as compared with the above-described conventional structure (see FIG. 15). By doing so, the uniformity of the pressure distribution of the entire engaging clutch 34 during sintering is maintained, the density of the powder particles is prevented from becoming unbalanced, and the engaging clutch 34 satisfying the above-mentioned required conditions is maintained. It can be obtained only by sintering. As a result, the engaging clutch 34 can be manufactured at low cost without the need for additional processing such as cutting after sintering.

As shown in FIGS. 4 and 9, the sun gear 35 is engaged with the engagement clutch 34 by the rotation support portion 54 and the engagement recess portion 55, and is chamfered as described above. The edge portion 35c makes the sliding of the engaging clutch 34 during the rotational displacement smooth, and suppresses the generation of vibration and sound. Further, in comparison with the conventional sun gear 140 shown in FIG. 16, in this conventional sun gear 140, the engagement hole 143 is formed independently of the shaft hole 142, and the meat portion 144 exists inside the engagement hole 143. On the other hand, in the sun gear according to the present invention, since the portion corresponding to the meat portion 144 inside the engagement hole 143 is omitted, the shape is simplified and the outer diameter d1 of the sun gear is reduced by the omitted portion of the meat portion 144. The size of the mirror body 10 incorporating the sun gear 35 can be reduced.

Further, the inner peripheral protruding portion 35b provided on the sun gear 35 is excellent in functionality and assembling property such as erroneous assembly is prevented. Moreover, since it has a simple shape, it is possible to obtain a sun gear that satisfies the required requirements only by sintering, and as a result, there is no need for additional processing after sintering, and the sun gear 35 can be manufactured at low cost.

[0057]

[Effect of device]

 As described above, according to the present invention, a peripheral notch is provided on the outer side of the engaging protrusion protruding upward of the engaging clutch, a gear support is provided on the outer side of the connecting part, and a locking recess is provided on the inner side. Since the above is provided, the wall thickness is made substantially uniform over the entire engagement clutch, and the pressure distribution during sintering is made uniform. As a result, the density balance of the powder particles of the entire engaging clutch is maintained, and an engaging clutch satisfying the required requirements can be obtained only by molding by sintering. As a result, no additional work or the like is required for the engagement clutch after sintering, so that the engagement clutch can be manufactured at low cost.

Further, according to the sun gear of the present invention, the rotation supporting portion is provided on the inner surface of the cylindrical portion having the tooth portion on the outer periphery at predetermined intervals over the entire area in the thickness direction of the gear, and the engaging recesses are It is provided with a certain width between the rotation support parts, and the sliding edge is formed by chamfering the lower edge of the rotation support part, while the inner peripheral protrusion is formed on the upper end part between the rotation support parts. Since the shape is provided, the shape is simplified and the sun gear has a small diameter, so that the electric mirror can be downsized.

When the sun gear is rotationally displaced with respect to the engagement clutch, the sliding edge portion slides smoothly with respect to the engagement projection portion to suppress generation of sound and vibration, and The switch operation for switching the moving direction of the moving mirror is performed smoothly. In addition, if the sun gear is installed in the state opposite to the normal state, the engaging projection contacts the inner peripheral projection to prevent erroneous assembly. Can be assembled more efficiently.

Further, since the above-mentioned functionality is realized and the simple shape is adopted, a sun gear satisfying the required requirements can be obtained only by molding by sintering, and no additional work is required to form the sun gear. It can be manufactured at low cost. This makes it possible to make the electric mirror even cheaper.

[Brief description of drawings]

FIG. 1 is a sectional front view of an electric mirror according to an embodiment of the present invention.

FIG. 2 is a partial cross-sectional plan view of the electric mirror.

FIG. 3 is an exploded perspective view of a rotation drive mechanism provided in the electric mirror.

FIG. 4 is an exploded perspective view of main elements of the electric mirror.

FIG. 5 is a perspective view of an engagement clutch of the electric mirror.

FIG. 6 is a cross-sectional view showing a structure near a sun gear in the electric mirror.

FIG. 7 is a partial cross-sectional plan view showing a relationship between a protrusion and a restriction groove in the electric mirror.

FIG. 8 is a front view showing an engagement state between a rotation support portion and an engagement clutch in the electric mirror.

FIG. 9 is a perspective view of a partial cross section of a sun gear in the electric mirror.

10 (a), (b), and (c) are partial cross-sectional front views showing the engaged state of the operating portion of the slide switch and the lever portion of the lever washer.

FIG. 11 is an exploded perspective view of the slide switch.

12 (a), (b) and (c) are explanatory views of each operation process of the position determining portion of the slide switch.

FIG. 13 is a circuit diagram of a drive circuit provided in the electric mirror.

14 (a), (b) and (c) are plan views showing the relationship between the rotational direction of the planetary gears and the torque acting on the sun gear at each position.

FIG. 15 is a perspective view of a conventional engagement clutch.

FIG. 16 is a plan view of a conventional sun gear.

[Explanation of symbols]

 10 Mirror Main Body 14 Base Shaft (Support Shaft) 16 Motor 18, 19, 20, 24, 25, 26, 27 Gear 28 Planetary Gear 34 Engagement Clutch 34a Coupling 34b Gear Support 34c Engagement Recess 34e Peripheral Notch 35 Sun gear 35a Cylindrical part 35b Inner peripheral projection 35c Sliding edge 36 Lever washer 46 Projection 48 Restriction groove 50 Engagement protrusion 54 Rotation support 55 Engagement recess 58 Slide switch

Claims (2)

[Scope of utility model registration request] 1. A support shaft projecting from a vehicle body, an engagement clutch made of a sintered material, which is engaged with the support shaft, a sun gear engaged with the engagement clutch, and a sun gear. In an electric mirror having a rotatably mounted mirror body, the engaging clutch includes a plurality of engaging protrusions engaged with engaging recesses formed in a sun gear, and adjacent engaging protrusions. And a gear support portion for supporting the sun gear and a locking recess for locking the support shaft are formed in the connection portion. Is an electric mirror having a peripheral notch formed by notching an outer portion of the engaging protrusion. 2. A support shaft projecting from a vehicle body, an engagement clutch engaged with the support shaft, a sun gear made of a sintered material engaged with the engagement clutch, and a sun gear. In an electric mirror having a rotatably mounted mirror body, the sun gear has a cylindrical portion having teeth formed on an outer periphery thereof, and a plurality of rotatably provided on an inner surface of the cylindrical portion at predetermined intervals. Below the rotation support portion, there are provided support portions, engagement recesses of a predetermined width formed between the rotation support portions, and inner circumferential projections protruding from the upper end of the engagement recesses. The electric mirror is characterized in that a chamfered sliding edge is formed on the portion.