JPH0639586U - Electric mirror - Google Patents

Abstract

(57) [Abstract] [Purpose] An object of the present invention is to provide an electric mirror that can reduce the size of the electric mirror as a whole and can reduce the number of parts and the number of assembling steps. In the electric mirror according to the present invention, a rotary housing body 2 is rotatably provided on a fixed base housing body 1 at a front portion of a vehicle body, and the rotary housing body 2 is rotated on the base housing body 1. A rotation mechanism is installed, and a shaft 15 having a mirror body attached to the tip of the rotation housing body 2 is provided.
A rotation mechanism for rotating 7 is installed. The rotation mechanism and the rotation mechanism respectively have drive motors M1 and M2, and at least one of the drive motors M1 and M2 prevents noise of the other drive motor and A circuit board 52 having a circuit for preventing noise of one drive motor is attached.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 According to the present invention, a base housing body is fixed to a stay installed at a front part of a vehicle body, a rotary housing body is rotatably provided on the base housing body, and a shaft is rotatably provided on the rotary housing body. Electric mirror that rotates the mirror body attached to the tip of the

[0002]

[Prior art]

 Conventionally, as shown in FIG. 34, a double-sided stay 301 is attached to a front portion of a vehicle body of a large vehicle such as a large trailer, for example, a side portion on a passenger side of a cab 300, and an outside mirror is attached to the stay 301. It is known that the electric mirror 302 is fixed.

This conventional electric mirror 302 includes a base housing body 304 having a rotation mechanism for rotating the mirror body 303 in the left-right direction around the stay 301, and a rotation mechanism for rotating the mirror body 303 in the up-down direction. And a rotating housing body 305.

The base housing body 304 is provided with a drive motor, a rotation transmission gear, a clutch mechanism, etc. for rotating the rotation housing body 305 in the left-right direction. Further, the rotating housing 305 is provided with a drive motor, a rotation transmitting gear, a clutch mechanism, etc. for rotating the mirror body 303 in the vertical direction via a shaft 306.

In this conventional electric mirror 302, since the mirror body 303 can be rotated in the left-right and up-down directions about the stay 301, a relatively large rotation angle can be obtained and it is convenient for storage. Has the advantage.

[0006]

[Problems to be Solved by the Invention] In the past, in order to prevent noise from being generated by the drive motors, a circuit board having two pairs of capacitors was installed near each drive motor. . For this reason, it is necessary to secure a circuit board installation space for each housing body, and since it is necessary to assemble a circuit board for each drive motor, it takes time to assemble, Since it is provided for each motor, there is a problem that the number of parts increases.

The present invention has been made in view of the above circumstances, and an object of the present invention is to reduce the size of the entire electric mirror, reduce the number of parts, and the number of assembling steps. An object of the present invention is to provide an electric mirror capable of shortening the length.

[0008]

[Means for Solving the Problems]

 In order to solve the above problems, an electric mirror according to the present invention is provided with a rotatable housing body on a fixed base housing body at a front portion of a vehicle body, and the base housing body has the rotatable housing body. A rotating mechanism for rotating a shaft having a mirror body attached to the tip of the rotating housing is installed in the rotating housing, and the rotating mechanism and the rotating mechanism are respectively drive motors. At least one of the drive motors is provided with a circuit board having a circuit for preventing noise of the other drive motor and for preventing noise of the other drive motor.

[0009]

[Action]

 According to the electric mirror of the present invention, noise of both drive motors can be prevented by the noise prevention circuit provided on only one of the pair of drive motors.

[0010]

【Example】

 Embodiments of an electric mirror according to the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 is a base housing body, and 2 is a rotating housing body. The base housing 1 is generally composed of a mounting substrate 3 and a lower cover 4. As shown in FIG. 2, the mounting substrate portion 3 has a large-diameter circular portion 5 for installing a rotary housing body and a small-diameter circular portion 7 to which a stay 6 installed on the front passenger side of the vehicle body is attached. . An annular peripheral wall 8 is formed at the lower part of the large-diameter circular portion 5 so as to stand downward. As shown in FIGS. 1 and 3, the small-diameter circular portion 7 is formed with a cylindrical holding tube 9 extending downward. 1 to 3, reference numeral 10 is a stay insertion hole of the cylindrical holding tube 9. The cylindrical holding cylinder 9 has a divided semicircular cylinder portion 11, and the divided semicircular cylinder portion 11 uses four screw members 13 with the stay 6 set in the divided semicircular cylinder portion 12. The stay 6 is fastened to the split semicircular cylinder portion 12 and is clamped to the circular clamping cylinder 9. As a result, the electric mirror is fixed to the stay 6.

The annular peripheral wall 8 has an inner-outer double wall structure including an inner annular peripheral wall 14 and an outer annular peripheral wall 15, and an annular groove 16 for mounting a lower cover is provided between the inner annular peripheral wall 14 and the outer annular peripheral wall 15. Has been formed. An O-ring 17 is interposed in the annular groove 16. The inside of the inner ring-shaped peripheral wall 14 serves as a rotation mechanism installation space. As shown in FIG. 4, two screw holes 18 and 18 for screwing the lower cover are formed between the large-diameter circular portion 5 and the small-diameter circular portion 7 on the lower surface of the mounting substrate portion 3. Two boss portions 19 and 19 projecting downward are formed inside the inner annular peripheral wall 14, and screw holes 20 and 20 for screwing the lower cover are formed in the boss portions 19 and 19, respectively. ing. The lower cover 4 is screwed to the large-diameter circular portion 5 with four screw members 21 in a state where the end portion 4a is fitted in the annular groove 16.

On the lower surface of the mounting substrate portion 3, for supporting both ends of a worm / worm gear shaft 22 (see FIGS. 5 and 6) as a component of the rotating mechanism portion inside the inner annular peripheral wall 14. A pair of bearings 23, 24, a bearing 25 for supporting the intermediate part of the worm / worm gear shaft 22, an oval bearing hole 28 for supporting the rotation supporting shaft 27 of the two-stage gear 26, and a vertical direction. A circular through hole 29 penetrating therethrough and one boss portion 32 having a screw hole 31 for attaching a motor mounting substrate 30 (see FIGS. 7 and 8) are formed. The shape of the motor mounting board 30 will be described later.

Positioning projections 33, 33 for positioning the motor mounting board 30 are formed on the pair of bearing portions 23, 24, and the motor mounting board 30 is fixed in cooperation with the boss portion 32. Screw holes 34, 34 are formed respectively. A pair of bearings 23, 24 are fitted with a bearing sleeve 35 (see FIG. 5) in the recesses 23a, 24a (the other bearing sleeve is not shown), and the worm / worm gear shaft 22 Both ends are rotatably supported by a pair of bearing tubes. Reference numeral 25a is a semicircular recess in which the intermediate portion of the worm / worm gear shaft 22 is supported.

The worm / worm gear shaft 22 has a worm 36 and a worm gear 37. As shown in FIG. 5, the rotation support shaft 27 has an oval end portion 27a, and the end portion 27a is fitted into an oval bearing hole 28 so as to be non-rotatably supported by the large-diameter circular portion 5. To be done. The two-stage gear 26 is rotatably supported on the rotation support shaft 27. The two-stage gear 26 includes a small diameter gear 38 and a worm gear 39. The worm gear 39 meshes with the worm 36, and the small diameter gear 38 meshes with a reduction gear 41 (see FIG. 5) having an oval mounting hole 40 formed therein. It As shown in FIG. 7, the motor mounting board 30 supports the screw insertion holes 42 facing the respective screw holes, the positioning holes 43 fitted into the positioning protrusions 33, and the other end of the rotation support shaft 27. The bearing cylinder 37 is formed, and the standing wall 44 for mounting the motor and the standing wall 47 that supports the resin bearing 46 of the output shaft 45 of the drive motor M1 shown in FIG. 3 are formed.

The front end surface of the drive motor M1 is fixed to the standing wall 44 by screw members 48, 48. A worm 49 is provided on the output shaft 45 of the drive motor M1, and the worm 49 is meshed with the worm gear 37. The resin bearing 46 is fitted in the standing wall 47, and the resin bearing 50 rotatably supports the tip of the output shaft 45. As shown in FIGS. 3, 7, and 8, a notch 51 is formed in the motor mounting board 30 so that the worm gear 37 faces the worm 49. The motor mounting board 30 is formed with an opening 51 'facing the worm 36. As shown in FIG. 3, a circuit board 52 for preventing noise is provided at the rear end of the drive motor M1.

FIG. 9 shows a plan view of the circuit board 52. The circuit board 52 is provided with three capacitors 53, 54, 55 and one thermistor 56 for preventing overcurrent. The thermistor 56 is partially omitted in the drawing. The circuit board 52 is shared by the drive motor M1 and the drive motor M2 (see FIG. 1). A circuit diagram of this circuit board 52 is shown in FIG. The circuit pattern 57 is connected to the circuit pattern 58 via the thermistor 56. The circuit pattern 58 is connected to the circuit pattern 59 via the capacitor 55 and is also electrically connected to one power supply terminal 60 of the drive motor M1. This connection is made by inserting one power supply terminal 60 into the insertion hole of the circuit board 52 and soldering.

One leg of the capacitors 53 and 54 is connected to the circuit pattern 59, and the other leg of the capacitor 54 is connected to the circuit pattern 61. The other leg of the capacitor 53 is connected to the circuit pattern 62. The circuit pattern 62 is electrically connected to the other power source terminal 63 of the drive motor M1. This connection is made by inserting the other power supply terminal 63 into the insertion hole of the circuit board 52 and soldering. The grounding lead wire 64 is drawn out from the circuit pattern 59, and an earth piece 65 is provided at the drawn-out end as shown in FIG. The ground piece 65 is fixed to the motor mounting board 30 together when the motor mounting board 30 is fixed by the screw member 48 '. Lead wires 66 and 67 are drawn out from the circuit pattern 57 and the circuit pattern 62. Lead wires 68 and 69 are drawn out from the circuit pattern 61. A lead wire 70 is drawn out from the circuit pattern 58. The lead wires 69 and 70 are connected to power supply terminals 45 'and 45' of the drive motor M2, respectively, and the lead wires 66, 67 and 68 are bundled by a wire tube and guided to a connector. The lead wires 66 and 67 are used to supply power to the drive motor M1, and noise is reduced by the action of the capacitors 53 and 55. The lead wires 69 and 70 are used to supply power to the drive motor M2, noise is reduced by the action of the capacitors 54 and 55, and the capacitor 55 is also used to prevent noise from the drive motors M1 and M2. The rotation directions of the drive motors M1 and M2 are switched by switching the energization direction to each motor.

As shown in FIGS. 2 and 11, the mounting substrate portion 3 has a circular boss portion 71 as a rotating shaft portion of the rotating housing body 2 protrudingly formed on the upper portion thereof, and the rotating housing Engagement projections 72 that restrict the rotation angle of the ring body 3 are formed.

An O-ring 73 is fitted around the outer circumference of the circular boss portion 71. The circular through hole 29 is provided at the center of the circular boss portion 71. A bush member 75 (see FIG. 1) having a flange portion 74 at the bottom is fitted into the circular through hole 29. An upper surface 71a of the circular boss 71 is a clutch plate setting surface. A ring-shaped clutch plate 76 shown in FIG. 12 is set on the upper surface 71a, and the clutch plate 76 is formed with notches 77 having different extending lengths at predetermined intervals in the circumferential direction. Engagement projections 78 are formed in the circumferential direction of the circular boss portion 71 so as to correspond to the notches 77 of the clutch plate 76. An escape groove 79 is formed on the upper surface 71a along the base of the engaging projection 78. The relief groove 79 contributes to flattening the surface when the clutch plate 76 is set on the upper surface 71a (prevents the clutch plate 76 from being tilted and set due to foreign matter adhering to the base of the engaging projection 78).

The clutch plate 76 is formed by pressing a friction plate 82 onto a metal plate 81 as shown in FIG. The clutch plate 76 is positioned and set on the upper surface 71a so that the friction plate 82 faces the upper surface. At this time, since the notch 77 of the clutch plate 76 has a different extension in the circumferential direction, it also serves to prevent the wrong attachment of the upper and lower surfaces of the clutch plate 76 to the upper surface 71a.

As shown in FIG. 1, the rotary housing body 2 is composed of a disk-shaped rotary substrate 83 and an upper cover 84. As shown in FIG. 14, on the lower surface of the disk-shaped rotary substrate 83, a rotary shaft cylinder 85 fitted to the bush member 75, an annular peripheral wall 86 concentric with the rotary shaft cylinder 85, and an engagement protrusion 87. Are formed. A sliding contact plate 88 (see FIG. 15) is non-rotatably tightly fitted to the disc-shaped rotary substrate 83 between the rotary shaft cylinder 85 and the annular peripheral wall 86. The engagement protrusion 87 faces the engagement protrusion 72 so as to be engageable therewith, and regulates the rotation angle of the disc-shaped rotation base plate 83 with respect to the mounting base 3. A notch 89 is formed in the sliding contact plate 88 in the circumferential direction thereof, and an engaging protrusion 90 corresponding to the notch 89 is formed along the annular peripheral wall 86 in the disc-shaped rotary substrate 83. Reference numeral 91 is a crescent-shaped recess. The disc-shaped rotating substrate 83 is rotated to the mounting substrate portion 3 by fitting the annular peripheral wall 86 to the circular boss portion 71 via the O-ring 73 with the rotating shaft cylinder 85 inserted through the bush member 75. The sliding contact plate 88 and the friction plate 82 of the clutch plate 76 face each other so that they can be mounted.

Positioning holes 93, 93, 93 (see broken lines in FIG. 14) are formed on the upper surface of the disk-shaped rotary substrate 83 at predetermined intervals in the circumferential direction of the shaft hole 92 of the rotary shaft cylinder 85. It is formed at every predetermined angle. The rotation transmission shaft 94 is inserted into the rotary shaft cylinder 85. A pressing flange 95 is formed on the head of the rotary transmission shaft 94 as shown in FIG. As shown in FIG. 17, an engaging protrusion 97 for positioning the clutch base 96 (see FIG. 18) is formed in the lower part of the holding flange 95 in the circumferential direction. An escape groove 98 is formed in the base of the engaging projection 97 to surround the base. The escape groove 98 has a role similar to that of the escape groove 79. A notch 96a is formed in the clutch base 96 in the circumferential direction so as to correspond to the engaging projection 97. A clutch plate 99 is interposed between the clutch base 96 and the pressing flange 95 as shown in FIG. As shown in FIGS. 19 to 21, the clutch plate 99 is formed by friction plates 101, 101 being pressure-bonded to both end faces of a metal plate 100. On the outer peripheral side of the metal plate 100, engaging pieces 102, 102, 102 are formed around the outer periphery of the metal plate 100 so as to curve downward and fit into the positioning holes 93, 93, 93 (see FIG. 14). . A disc-shaped sliding contact plate 103 is provided between the clutch base 96 and the disc-shaped rotation base plate 83.

As shown in FIG. 16, an oval-shaped gear mounting portion 105 is formed on the shaft portion 104 of the rotation transmission shaft 94. The gear mounting portion 105 projects from the lower surface of the mounting base 3 and penetrates the mounting hole 40 of the reduction gear 41. A holding spring 106 shown in FIG. 1 is inserted into the gear mounting portion 105 from behind the reduction gear 41. A guide hole 107 is formed in the center of the rotation transmission shaft 94. Lead wires 69, 70 soldered to the power supply terminals 45 ', 45' (see FIG. 1) of the drive motor M2 are guided from the rotary housing body 2 to the base housing body 1 through the guide holes 107. An annular groove 108 (see FIG. 16) is formed in the circumferential direction of the rear end of the gear mounting portion 105. A disc-shaped presser foot 109 (see FIG. 1) is provided on the back surface of the presser spring 106, and an engagement piece 110 that is engaged with the peripheral wall of the annular groove 108 is formed on the inner peripheral side of the presser foot 109. Has been done. The presser spring 106 is interposed between the presser foot 109 and the reduction gear 41 in a state of being compressed by the presser foot 109, and the elastic urging force of the presser spring 106 brings the surfaces of the clutch mechanism facing each other into close contact with each other.

When the reduction gear 41 is rotated by the drive motor M1, the rotation transmission shaft 94 integrally rotates. When the rotation transmission shaft 94 rotates, the rotational force is transmitted to the clutch plate 99. Since the friction plates 101 are provided on both sides of the clutch plate 99 and are in sliding contact with the clutch base 96 and the pressing flange 95, even if the diameter of the clutch plate 99 is not increased to increase the friction area, A friction area can be secured. That is, the rotational force of the rotation transmitting shaft 94 is transmitted to the clutch plate 99 by the frictional force between the clutch base 96 and the friction plate 101 slidingly contacting it and the frictional force between the pressing flange 95 and the friction plate 101 slidingly contacting this. The rotating housing body 2 is rotated by the clutch plate 99. As a result, the mirror body is swung in the left-right direction (direction of arrow A) around the stay 6 as shown in FIG. When the rotary housing 2 is rotated by a predetermined angle, the engaging projection 87 thereof engages with the engaging projection 72 of the base housing body 1, whereby the rotation of the rotary housing body 2 is stopped. Furthermore, when the drive motor M1 is continuously energized, the friction force of the clutch plate 99 is overcome by the rotation force of the rotation transmission shaft 94, and the rotation transmission shaft 94 idles. As a result, an excessive load is prevented from being applied to the drive motor M1, and seizure of the drive motor M1 is prevented. The clutch plate 76 interposed between the circular boss portion 71 and the disc-shaped turning base plate 83 plays a role of holding the turning position of the turning housing body 2.

As shown in FIGS. 23 and 24, a support bracket 111 is formed upright on the disc-shaped rotary substrate 83, as shown in FIGS. The support bracket 111 is formed with a circular opening 112 for inserting a rotation transmission medium cylinder, which will be described later, and the circular opening 112 has a bearing cylinder having a flange 113 at the rear end as shown in an enlarged view in FIG. 114 is fitted. On the front surface side of the support bracket 111, an engaging projection 115 for limiting a turning range of a mirror mounting shaft (shaft) described later is formed at a peripheral wall portion of the circular opening 112 and at a lower portion thereof. Positioning protrusions 116 are formed around the circumference of the circular opening 112 of the support bracket 111. On the peripheral wall on the front side of the circular opening 112, a disc-shaped sliding contact plate 117, which is positioned by the positioning protrusion 116, is mounted. The shape of the sliding contact plate 117 is the same as that of the sliding contact plate 88 shown in FIG. 15, and the notch corresponding to the positioning protrusion 116 is also the same as the notch 89 of the sliding contact plate 88.

The support bracket 111 is provided with three screw threaded portions 118, 118, 118. The screw screwing portion 118 is formed corresponding to the screw inserting hole of the motor mounting board 119 shown in FIG. Positioning protrusions 121 are formed on the lower portion of the support bracket 111. The support bracket 111 receives the oval bearing hole 124 (see FIG. 24) for supporting the rotation support shaft 123 of the two-stage gear 122 shown in FIG. 27 and the output shaft 45 (see FIG. 1) of the drive motor M2. Resin bearing 125 and bearings 127, 127 that support both ends of the worm / worm gear shaft 126 (see FIG. 27), and a bearing 128 that supports the intermediate portion of the worm / worm gear shaft 126.

One end 123 a of the rotation support shaft 123 has an oval shape corresponding to the shape of the bearing hole 124, and the rotation support shaft 123 is rotatably supported by the support bracket 111. Both ends of the worm / worm gear shaft 126 are rotatably supported by cylindrical bearings 129, 129, and the respective cylindrical bearings 129, 129 are in semicircular recesses 130, 130 formed in the respective bearing portions 127, 127. It is fitted. The worm / worm gear shaft 126 has a worm 131 and a worm gear 132 shown in FIG. The two-stage gear 122 is composed of a small-diameter gear 133 and a worm gear 134. The two-stage gear 122 is rotatably supported by the rotation support shaft 123 such that the worm gear 134 is meshed with the worm 131.

As shown in FIGS. 26 and 28, the motor mounting board 119 is provided with an opening 135 at a position corresponding to the circular opening 112, which allows projection of a mirror mounting shaft to be described later. A bottomed cylindrical projection 136 is formed. The front end surface of the drive motor M 2 is in close contact with the bottomed cylindrical protrusion 136, and is screwed and fixed to the motor mounting board 119 by a pair of screws. The worm 137 is fixed to the output shaft 45 of the drive motor M2. The worm 137 is meshed with the worm gear 132, the motor mounting board 119 is formed with an opening 138 facing the rotation range of the worm gear 132, and a cylinder for pivotally supporting the other end 123b of the rotation support shaft 123. The bearing 139 is formed to project, and a positioning fitting hole 140 into which the positioning protrusion 121 formed in the lower portion of the support bracket 111 is fitted is formed. In the motor mounting board 119, the positioning projections 121 are fitted into the positioning fitting holes 140, and the other end 123b of the rotation support shaft 123 is inserted into the cylindrical bearing 139. Fixed to. The upper end of the motor mounting board 119 is bent to form a cover mounting plate portion 141 as shown in FIGS. 1 and 28, and a screw hole 142 is formed in the cover mounting plate portion 141.

As shown in FIG. 1, an O-ring 143 is fitted around the lower part of the disk-shaped turning board 83, and the upper cover 84 is fitted on the disk-shaped turning board 83 via the O-ring 143. At the same time, the screws 144 are fixed to the motor mounting substrate 119. As shown in FIG. 25, a substantially square opening 145 is formed on the front surface of the upper cover 84, and screw holes (not shown) are formed at the corners of the peripheral wall of the opening. As shown in FIG. 29, a lid member 146 having a substantially square shape is screwed into the opening 145 by a screw member 147, and the lid member 146 has a shape corresponding to the peripheral wall of the opening of the upper cover 84. A guide hole 148 is formed in the center of the lid member 146, and an annular peripheral wall 149 is formed on the front surface of the lid member 146 so as to surround the guide hole 148. An annular step portion 150 for mounting packing and a plurality of positioning protrusions 151 are formed on the back portion of the lid member 146.

The packing 152 is interposed between the upper cover 84 and the lid member 146, and has a stepped portion 153 in close contact with the annular stepped portion 150 and the lid member 146, and a cylindrical portion 154. Positioning holes 155 that fit into the positioning protrusions 151 are formed in the step 153. The cylindrical portion 154 is provided with a plurality of annular grooves 156, which extend in the circumferential direction around the outer circumference and the inner circumference of the cylindrical portion 154 at intervals in the axial direction thereof to improve the sealing performance and rotate the mirror mounting shaft 157. It is set so as not to interfere as much as possible. The mirror mounting shaft 157 has a ball joint portion (not shown) at the tip, a circular flange portion 158 (see FIGS. 1 and 25) at the middle portion, and an insertion shaft portion 159 at the rear end. The flange portion 158 is provided with a circular fitting step portion 160 that is fitted to the cylindrical portion 154 of the packing 152. A notch 161 for engagement is formed in the flange portion 158 over a predetermined angle range. The rotation transmission medium cylinder 162 shown in FIGS. 30 to 32 is inserted into the insertion shaft portion 159 of the mirror attachment shaft 157. Incidentally, the same ball body as the mirror body 303 shown in FIG. 34 is rotatably attached to the ball joint portion.

The rotation transmission medium cylinder 162 has a cylinder hole 163 formed along the axis at the center and a flange portion 164 for setting the friction clutch plate at the front. An engaging projection 166 for positioning the friction clutch plate 165 shown in FIG. 25 is formed on the front surface of the flange portion 164.

A positioning protrusion 168 for positioning the friction clutch plate 167 shown in FIG. 25 is formed on the rear surface of the flange portion 164. Escape grooves 169 and 170 are formed on the front surface and the back surface of the flange portion 164 so as to go around the bases of the protrusions 166 and 168. The role of the escape grooves 169 and 170 is similar to that of the escape groove 79. The friction clutch plates 165 and 167 are formed by pressing a friction plate onto a metal plate, and have the same shape as the friction clutch plate 76 shown in FIGS. 12 and 13, and 171 and 172 in FIG. A friction plate corresponding to the friction plate 82 is shown.

An oval-shaped gear mounting portion 168 ′ that engages with an oval-shaped mounting hole 174 formed in the reduction gear 173 is formed at the rear end of the rotation transmitting medium cylinder 162. The rotation transmission medium cylinder 162 is inserted into the bearing cylinder 114 while carrying the friction clutch plates 165 and 167. When the support bracket 111 is inserted into the bearing cylinder 114, the reduction gear 173 is meshed with the small diameter gear 133. It is mounted on the gear mounting portion 168 'in the closed state. The insertion shaft portion 159 of the mirror mounting shaft 157 is passed through the cylindrical hole 163 of the rotation transmission medium cylinder 162 so that the notch 161 for engagement of the flange portion 158 faces the engagement protrusion 115, and the motor mounting board 119 from the support bracket 111. Is projected toward. A receiving groove (having the same shape as the receiving groove 108) for receiving the presser foot 175 (having the same shape as the presser foot 109) shown in FIG. 1 is provided at the rear end of the insertion shaft portion 159. It is formed in the circumferential direction. A pressing vane 176 is inserted from the rear end into the insertion shaft portion 159, and the pressing spring 176 is compressed by the presser bar 175. 177 is a spring receiving plate. The pressing spring 176 urges the mirror mounting shaft 157 so that the flange portion 158 approaches the support bracket 111, and the surfaces of the flange portion 158 and the friction clutch plate 165 facing each other are brought into close contact with each other, and The surfaces of the clutch plate 167 and the sliding contact plate 117 facing each other are in close contact with each other. Here, the frictional force between the clutch plate 165 and the flange portion 158 is set equal to or smaller than the frictional force between the clutch plate 167 and the sliding contact plate 117.

When the drive motor M2 is rotated, the rotation is transmitted to the reduction gear 173 via the worm / worm gear. Since the rotation transmission medium cylinder 162 is configured to be rotatable integrally with the reduction gear 173, the rotation transmission medium cylinder 162 rotates integrally with the reduction gear 173. When the rotation transmission medium cylinder 162 rotates, the pair of clutch plates 165, 167 integrally rotate with the rotation transmission medium cylinder 162, and the mirror mounting shaft 157 is inserted through the clutch plate 165 as shown in FIG. Is rotated within the range. When the mirror mounting shaft 157 rotates by a predetermined angle and the engaging protrusion 115 engages with the end 161a of the notch 161, the rotation of the mirror mounting shaft 157 stops. When the drive motor M2 is still energized, the friction force between the clutch plate 165 and the flange portion 158 is overcome, and the rotation transmission medium cylinder 162 runs idle. This prevents an excessive load from being applied to the drive motor M2.

When the drive motor M2 is de-energized and the rotation of the mirror mounting shaft 157 is stopped at a predetermined position, the mirror mounting is performed by the frictional force between the friction clutch plate 165 and the flange portion 158. Since the shaft 157 is held at the predetermined position, the adjustment position of the mirror body 303 is prevented from shifting during traveling.

When an external force for forcibly rotating the mirror mounting shaft 157 is applied, the frictional force between the clutch plate 167 and the sliding contact plate 117 becomes equal to the frictional force between the clutch plate 165 and the flange portion 158. Since they are set to be approximately equal to or more than that, when the mirror mounting shaft 157 is rotated, a slip occurs between the clutch plate 165 and the flange portion 158, and only the mirror mounting shaft 157 rotates and the rotation transmission. The medium tube 162 does not rotate. Therefore, even if an unexpected external force is applied to the mirror mounting shaft 157, the external force is prevented from being applied to the reduction gear.

FIG. 33 shows a modified example of the clutch mechanism that transmits the rotation of the drive motor M 1 of the base housing body 1 to the rotary housing body 2. Friction plates 202 and 203 are provided on one side of the pair of clutch bases 200 and 201. It is pressure-bonded and formed, and the slide contact plate 204 is interposed between the pair of clutch bases 200 and 201, and is inserted into the rotation transmission shaft 94. The rotation of the rotation transmission shaft 94 is transmitted through the clutch bases 200 and 201 to the slide contact plate 204. To the disk-shaped rotary substrate 83 of the rotary housing body 2.

In FIG. 33, reference numeral 205 denotes an engagement piece fitted in the positioning hole 93, and the friction contact plate 99 shown in FIG. 19 except that the sliding contact plate 204 does not have a friction plate. The clutch bases 200 and 201 have the same shape as the clutch base 96 shown in FIG. 18, except that the clutch bases 200 and 201 have friction plates. This type has the disadvantage that it has one more component than the clutch mechanism that uses the friction clutch plate 99 having friction plates on both sides, but it can rotate without increasing the diameter of the clutch plate compared to the conventional one. Transmission power can be secured.

[0040]

【effect】

 Since the electric mirror according to the present invention is configured as described above, the overall size can be reduced, the number of parts can be reduced, and the number of assembling steps can be reduced.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a main part of an electric mirror according to the present invention.

FIG. 2 is likewise a plan view of a mounting substrate portion.

FIG. 3 is a partially cutaway bottom view showing the internal structure of the base housing body.

FIG. 4 is likewise a bottom view of the mounting substrate portion.

FIG. 5 is likewise an explanatory view showing a gear configuration of a rotating mechanism section.

FIG. 6 is likewise a front view of the worm / worm gear shaft.

FIG. 7 is a plan view of the motor mounting board fixed to the base housing body.

FIG. 8 is a sectional view of a motor mounting board fixed to the base housing body in the same manner.

FIG. 9 is likewise a front view of the circuit board.

FIG. 10 is likewise a circuit diagram for noise prevention.

FIG. 11 is likewise a front view of the mounting substrate portion.

FIG. 12 is likewise a plan view of a clutch plate.

FIG. 13 is likewise a cross-sectional view taken along the line CC of FIG.

FIG. 14 is likewise a bottom view of the disc-shaped rotating substrate.

FIG. 15 is likewise a plan view of a sliding contact plate.

FIG. 16 is likewise a front view in which a part of the rotation transmission shaft is cut away.

FIG. 17 is likewise a bottom view of the rotation transmission shaft.

FIG. 18 is likewise a plan view of the clutch base.

FIG. 19 is likewise a bottom view of the clutch plate.

FIG. 20 is likewise a front view of the clutch plate.

21 is a sectional view taken along line DD of FIG.

FIG. 22 is likewise a plan view in which a part of the rotary housing is cut away.

FIG. 23 is likewise a vertical cross-sectional view of a disk-shaped rotating substrate.

FIG. 24 is likewise a rear view of the disk-shaped rotating substrate.

FIG. 25 is likewise an enlarged cross-sectional view of a main part of the rotary housing body.

FIG. 26 is likewise a rear view with a part of the electric mirror cut away.

FIG. 27 is likewise an explanatory diagram showing a gear configuration of the rotation transmission mechanism portion.

FIG. 28 is likewise a vertical cross-sectional view of a motor mounting board.

FIG. 29 is likewise a front view of the electric mirror with the shaft cut.

FIG. 30 is likewise a front view of a rotation transmission medium cylinder.

FIG. 31 is likewise a plan view of a rotation transmission medium cylinder.

FIG. 32 is likewise a bottom view of the rotation transmission medium cylinder.

FIG. 33 is likewise an exploded perspective view of a main part showing a modified example of the clutch mechanism.

FIG. 34 is a perspective view showing a state in which a conventional electric mirror is attached to a stay.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Base housing body 2 ... Rotating housing body 52 ... Circuit board 53, 54, 55 ... Capacitor 61 ... Circuit pattern 157 ... Mirror mounting shaft M1, M2 ... Drive motor

Claims (1)

[Scope of utility model registration request] 1. A rotary housing body is rotatably provided on a fixed base housing body at a front portion of a vehicle body, and a rotary mechanism for rotating the rotary housing body is installed on the base housing body. A rotating mechanism for rotating a shaft having a mirror body attached to the tip thereof is installed in the rotating housing body, and the rotating mechanism and the rotating mechanism each have a drive motor, and at least one of the drive motors includes: An electric mirror, comprising: a circuit board provided with a circuit for preventing noise of the other drive motor and for preventing noise of the other drive motor.