JP3090171B2 - Electric mirror - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a base housing fixed to a stay installed at the front of a vehicle body, a rotatable housing provided on the base housing, and a rotatable housing mounted on the base housing. The present invention relates to an electric mirror provided with a shaft and configured to rotate a mirror body attached to a tip of the shaft in the left, right, up, and down directions.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 34, a both-end support type 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 of a driver's cab 300 on a passenger seat side.
A device in which an electric mirror 302 as an outside mirror is fixed to the stay 301 is known.

[0003] This conventional electric mirror 302 has a stay 3
A base housing body 304 provided with a rotating mechanism for rotating the mirror body 303 in the left-right direction about the center 01, and a rotating housing body 305 provided with a rotating mechanism for rotating the mirror body 303 in the vertical direction. I have.

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

In the conventional electric mirror 302, since the mirror body 303 can be rotated left and right and up and down about the stay 301, a relatively large rotation angle can be obtained and the mirror is convenient for storage. It has the advantage that.

[0006]

The clutch mechanism is interposed between the shaft and the rotation transmission gear in order to keep the position of the mirror body constant. It is desirable to prevent the rotation from being transmitted to the rotation transmission gear via the shaft when the rotation is applied to the shaft. On the other hand, when the shaft is rotated by the drive motor, the rotation of the rotation transmission gear is reliably transmitted to the shaft. It is desirable that
Further, when the rotation range of the shaft is restricted, when the shaft reaches the end of the rotation range and the rotation of the shaft becomes impossible, the rotation transmission gear is caused to idle around the shaft so that the drive motor is rotated. It is desirable to adopt a configuration for preventing seizure.

The present invention has been made in view of the above, and it is an object of the present invention that when an external force for rotating a shaft is applied to a mirror body, the rotation is transmitted to a rotation transmitting gear via the shaft. On the other hand, when the shaft is rotated by the drive motor, the rotation of the rotation transmission gear can be reliably transmitted to the shaft, and when the rotation region of the shaft is regulated, the shaft is moved to the end of the rotation region. It is an object of the present invention to provide an electric mirror capable of preventing a drive motor from burning by rotating the rotation transmission gear idlely with respect to the shaft when the rotation of the shaft becomes impossible.

[0008]

An electric mirror according to the present invention.
A rotating housing body is provided rotatably on a fixed base housing body at the front part of the vehicle body, and a driving mechanism for rotating the rotating housing body is installed on the base housing body. body rotation mechanism for rotating the mirror body mounting shaft to the tip is installed in the said shaft is rotatably supported by the bearing portion of the front Kikaido housing body, the said rotary mechanism the the drive motor the shaft A rotation transmission gear for transmitting the rotation of the drive motor is provided , and a rotation transmission intermediate cylinder is inserted into the rear end of the shaft, and a pair of friction clutch plates is carried on the rotation transmission intermediate cylinder. A pair of friction clutch plates are mounted on the flange portion so as to sandwich the flange portion from the thickness direction thereof, and one friction surface of the pair of friction clutch plates is The frictional surface of the other friction clutch plate faces the sliding contact surface of the pressure contact flange formed on the shaft, and the rear end of the rotation transmission intermediate cylinder has the rotating surface. A gear meshed with the final stage of the transmission gear is mounted so as to be integrally rotatable, and the shaft is urged in a direction in which the press-contact flange portion is in close contact with the bearing portion,
It characterized in that the rotational force of the driving motor is transmitted to the shaft through a friction clutch plate mounted on the rotation transmission mediated barrel.

[0009]

According to the electric mirror according to the present invention, when the drive motor mounted on the rotating housing body is rotated, the rotation is transmitted to the rotation transmission mediate via the rotation transmission gear.
Then, the rotation of the rotation transmission intermediate cylinder is transmitted to the shaft by the frictional force between the press-contact flange mounted on the rotation transmission intermediate cylinder and the friction clutch plate opposed thereto. Even when an external force for rotating the shaft is applied to the shaft, the rotation transmission intermediate cylinder is not rotated by the frictional force between the bearing portion and the friction clutch plate opposed thereto.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of an electric mirror according to the present invention.

In FIG. 1, 1 is a base housing body, 2
Is a rotating housing body. The base housing body 1 is roughly composed of a mounting board 3 and a lower cover 4. As shown in FIG. 2, the mounting board portion 3 has a large-diameter circular portion 5 for installing a rotating housing body and a small-diameter circular portion 7 to which a stay 6 to be installed is attached to the front passenger seat side at the front of the vehicle body. Large diameter circular part 5
An annular peripheral wall 8 is formed at the lower part of the lower part to rise up. As shown in FIGS. 1 and 3, the small-diameter circular portion 7 is formed with a cylindrical holding cylinder 9 extending downward. 1 to 3, reference numeral 10 denotes a stay insertion hole of the cylindrical holding cylinder 9. The cylindrical holding cylinder 9 has a divided semicircular cylindrical portion 11, and the divided semicircular cylindrical portion 11 is divided by the four screw members 13 in a state where the stay 6 is set on the divided semicircular cylindrical portion 12. The stay 6 is fastened to the semicircular cylindrical portion 12.
Are held by the circular holding cylinder 9. As a result, stay 6
The electric mirror is fixed to.

The annular peripheral wall 8 has an inner / outer double wall structure of an inner annular peripheral wall 14 and an outer annular peripheral wall 15.
An annular groove 16 for mounting the lower cover is formed between the outer peripheral wall 15 and the outer peripheral wall 15. The O-ring 1
7 are interposed. The inside of the inner annular peripheral wall 14 is a rotation mechanism installation space. As shown in FIG. 4, two screw holes 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 board portion 3, as shown in FIG. 4. Two bosses 19, 19 projecting downward inside the inner annular peripheral wall 14, are formed.
9 and 19 are formed with screw holes 20 and 20 for screwing the lower cover. The lower cover 4 is screwed to the large-diameter circular portion 5 using four screw members 21 in a state where the end 4a is fitted in the annular groove 16.

An inner annular peripheral wall 1 is provided on the lower surface of the mounting board portion 3.
4, a worm as a component of the rotation mechanism
A pair of bearings 23 and 24 for supporting both ends of the worm gear shaft 22 (see FIGS. 5 and 6), a bearing 25 for supporting an intermediate portion of the worm / worm gear shaft 22, and rotation of the two-stage gear 26 Oval shaped bearing hole 28 for supporting the spindle 27
, A circular through hole 29 penetrating vertically, and a screw hole 3 for mounting a motor mounting substrate 30 (see FIGS. 7 and 8).
One boss portion 32 having the number 1 is formed. The shape of the motor mounting board 30 will be described later.

A pair of bearings 23, 24 are formed with positioning projections 33, 33 for positioning the motor mounting substrate 30, and for fixing the motor mounting substrate 30 in cooperation with the boss 32. Are formed respectively. A bearing cylinder 35 (see FIG. 5) is fitted into the recesses 23a and 24a of the pair of bearing parts 23 and 24 (the other bearing cylinder is not shown), and both ends of the worm / worm gear shaft 22 are provided. Are rotatably supported by a pair of bearing cylinders. Reference numeral 25a denotes a semicircular recess in which an 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-shaped end portion 27a. The end portion 27a is fitted into an oval-shaped bearing hole 28 and is non-rotatably supported by the large-diameter circular portion 5. You. 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 is meshed with the worm 36, and the small-diameter gear 38 is a reduction gear 41 having an oval mounting hole 40 formed therein (see FIG. 5).
To be engaged. As shown in FIG. 7, the motor mounting board 30 has a screw insertion hole 42 opposed to each screw hole, a positioning hole 43 fitted to the positioning protrusion 33, and the other end of the rotation support shaft 27. A bearing cylinder 37 is formed, an upright wall 44 for mounting the motor, and the output shaft 4 of the drive motor M1 shown in FIG.
An upright wall 47 that supports the fifth resin bearing 46 is formed.

The drive motor M1 has a front end face having a screw member 4
It is fixed to the upright wall 44 by 8,48. 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 on the upright wall 47, and the tip of the output shaft 45 is rotatably supported on the resin bearing 50. As shown in FIG. 3, FIG. 7, and FIG.
Notch 51 is formed so that 7 faces worm 49. The motor mounting board 30 has an opening 5 facing the worm 36.
1 'is formed. At the rear end of the drive motor M1, FIG.
A circuit board 52 for preventing noise is provided as shown in FIG.

FIG. 9 is a plan view of the circuit board 52. The circuit board 52 has three capacitors 53, 5
4, 55 and one overcurrent preventing thermistor 56 are provided. The thermistor 56 is partially omitted. The circuit board 52 includes a driving motor M1 and a driving motor M.
2 (see FIG. 1). This circuit board 52
10 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 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 performing soldering.

The circuit pattern 59 includes capacitors 53 and 5
4 are connected, 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 supply terminal 63 of the drive motor M1. This connection connects the other power supply terminal 63 to the circuit board 52.
This is done by inserting into the insertion hole and soldering.
A ground lead wire 64 is drawn out of the circuit pattern 59, and a grounding piece 65 as shown in FIG.
Is provided. The ground piece 65 is also fixed to the motor mounting board 30 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 from the circuit pattern 61. Lead wires 70 are drawn out from the circuit pattern 58. Lead wires 69 and 70 are driven by drive motor M
2 power supply terminals 45 ', 45', respectively, and the lead wires 66, 67, 68 are bundled by a wire tube and led to a connector. The lead wires 66 and 67 are used for supplying power to the drive motor M1, and the capacitors 53 and 55
The effect of (1) reduces noise. Lead wire 69,
Reference numeral 70 is used to supply power to the drive motor M2, and noise is reduced by the action of the capacitors 54 and 55. The capacitor 55 is commonly used to prevent noise in the drive motors M1 and M2. The rotation direction of the drive motors M1 and M2 is switched by switching the direction of power supply to each motor.

As shown in FIG. 2 and FIG. 11, a circular boss 71 as a rotating shaft of the rotating housing 2 is formed on the mounting substrate 3 so as to protrude therefrom. An engagement protrusion 72 for regulating the rotation angle of the body 3 is formed.

An O-ring 73 is fitted around the outer periphery of the circular boss 71. The circular through hole 29 has a circular boss 71
It is provided in the center of. A bush member 75 (see FIG. 1) having a flange portion 74 at a lower portion is fitted into the circular through hole 29. The upper surface 71a of the circular boss 71 is a clutch plate setting surface. A wheel-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 extension lengths at predetermined intervals in the circumferential direction. Round boss 7
1 has an engagement projection 78 formed in a circumferential direction corresponding to the notch 77 of the clutch plate 76. An escape groove 79 is formed on the upper surface 71a along the base of the engagement projection 78. The clearance groove 79 contributes to flattening the clutch plate 76 when the clutch plate 76 is set on the upper surface 71a (prevents the clutch plate 76 from being set at an angle due to foreign matter attached to the base of the engagement protrusion 78).

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

As shown in FIG. 1, the rotating housing body 2 comprises a disk-shaped rotating substrate 83 and an upper cover 84. On the lower surface of the disc-shaped rotating board 83, as shown in FIG. 14, a rotating shaft tube 85 fitted to the bush member 75, an annular peripheral wall 86 concentric with the rotating shaft tube 85, and an engagement protrusion 87. Is formed. Further, a sliding contact plate 88 (see FIG. 15) is tightly fitted to the disc-shaped rotating board 83 between the rotating shaft cylinder 85 and the annular peripheral wall 86 so as not to rotate. The engagement projection 87 is engaged with the engagement projection 72 so as to be able to engage with the engagement projection 72, and regulates the rotation angle of the disk-shaped rotation substrate 83 with respect to the mounting base 3. A notch 89 is formed in the circumferential direction of the sliding contact plate 88, and an engagement protrusion 90 corresponding to the notch 89 is formed along the annular peripheral wall 86 in the disc-shaped rotating substrate 83. In addition, 91 is a crescent-shaped recess. The disc-shaped rotary board 83 is formed by inserting the rotary shaft cylinder 85 into the bush member 75 and forming an annular peripheral wall 86.
Is fitted to the circular boss portion 71 via the O-ring 73 so as to be rotatably mounted on the mounting board portion 3, and the sliding contact plate 88 and the friction plate 82 of the clutch plate 76 are opposed to each other.

Positioning holes 93, 93, 93 (see broken lines in FIG. 14) are formed on the upper surface of the disk-shaped rotating substrate 83 at predetermined intervals in the circumferential direction of the shaft hole 92 of the rotating shaft cylinder 85. It is formed for each predetermined angle. A rotation transmission shaft 94 is inserted through the rotation shaft cylinder 85. A holding flange 95 is formed on the head of the rotation transmission shaft 94 as shown in FIG. As shown in FIG. 17, an engagement 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. A relief groove 98 is formed in the base of the engagement projection 97 so as to extend around the base. This escape groove 98 has the same role as the escape groove 79. A notch 96a is formed in the clutch base 96 in a circumferential direction corresponding to the engagement protrusion 97. A clutch plate 99 is interposed between the clutch base 96 and the holding flange 95 as shown in FIG. Clutch plate 9
As shown in FIGS. 19 to 21, friction plates 9 are formed by pressing friction plates 101, 101 on both end surfaces of a metal plate 100.
Engagement pieces 102, 102, 102 are formed around the outer periphery of the metal plate 100 and are curved downward and fitted 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 rotating board 83.

As shown in FIG. 16, an oval gear mounting portion 105 is formed on a shaft portion 104 of the rotation transmitting shaft 94 as shown in FIG. The gear mounting portion 105 protrudes from the lower surface of the mounting base 3 and penetrates through the mounting hole 40 of the reduction gear 41. A pressing spring 106 shown in FIG. 1 is inserted through the gear mounting portion 105 from behind the reduction gear 41. The guide hole 1 is provided at the center of the rotation transmitting shaft 94.
07 is formed. Power supply terminal 45 of drive motor M2
', 45' (see FIG. 1) soldered to lead wire 6
9 and 70 are guided from the rotating housing body 2 to the base housing body 1 through the guide holes 107. Gear mounting part 10
An annular groove 108 (see FIG. 16) is formed at the rear end of the fifth member 5 in the circumferential direction. 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 to be engaged with the peripheral wall of the annular groove 108 is formed on the inner peripheral side of the presser foot 109. ing. Presser spring 1
Reference numeral 06 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 opposing surfaces of the clutch mechanism are brought into close contact with each other by the resilient urging force.

When the reduction gear 41 is rotated by the drive motor M1, the rotation transmission shaft 94 rotates integrally. When the rotation transmission shaft 94 rotates, the rotational force is transmitted to the clutch plate 99. A friction plate 101 is provided on both sides of the clutch plate 99 and is in sliding contact with the clutch base 96 and the holding flange 95.
The friction area can be ensured without increasing the friction area by increasing the diameter of 9. That is, the rotational force of the rotation transmitting shaft 94 is determined by the frictional force between the clutch base 96 and the friction plate 101 slidingly contacting the clutch base 96 and the frictional force between the pressing flange 95 and the friction plate 101 slidingly contacting the clutch base 96.
The rotation housing body 2 is rotated by the clutch plate 99. As a result, the mirror body is
As shown in FIG. 2, it is swung in the left-right direction (the direction of arrow A) about the stay 6. When the rotation housing body 2 is rotated by a predetermined angle, the engagement projection 87 engages with the engagement projection 72 of the base housing body 1, whereby the rotation of the rotation housing body 2 is stopped. If the drive motor M1 continues to be energized, the rotational force of the rotation transmission shaft 94 overcomes the frictional force of the clutch plate 99, and the rotation transmission shaft 9
4 spins idle. As a result, an excessive load is prevented from being applied to the drive motor M1, and burn-in of the drive motor M1 is prevented. The clutch plate 76 interposed between the circular boss 71 and the disc-shaped turning board 83 serves to hold the turning position of the turning housing 2.

FIGS. 23 and 24 show the disk-shaped rotating substrate 83.
As shown in the figure, a support bracket 111 is formed upright on the upper part. The support bracket 111 is formed with a circular opening 112 through which a rotation transmission intermediate tube described later is inserted. The circular opening 112 has a bearing tube 114 having a flange portion 113 at the rear end as shown in an enlarged view in FIG. Are fitted. On the front side of the support bracket 111, an engagement protrusion 115 for limiting a rotation range of a mirror mounting shaft (shaft) to be described later is formed at a lower portion of a peripheral wall portion of the circular opening 112. A positioning protrusion 116 is formed around the circumference of the circular opening 112 of the support bracket 111. A disk-shaped sliding contact plate 117 is mounted on the peripheral wall on the front side of the circular opening 112 while being positioned by the positioning protrusion 116. 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 screw portion 118 is formed corresponding to the screw insertion hole of the motor mounting board 119 shown in FIG. Support bracket 1
A positioning protrusion 121 is formed at a lower portion of the reference numeral 11. The support bracket 111 has an oval-shaped bearing hole 124 for supporting the rotation support shaft 123 of the two-stage gear 122 shown in FIG.
(See FIG. 24), a resin bearing 125 for receiving the output shaft 45 (see FIG. 1) of the drive motor M2, and bearing portions 127, 127 for supporting both ends of a worm / worm gear shaft 126 (see FIG. 27). And a bearing 128 for supporting an intermediate portion of the worm gear shaft 126.

One end 123a of the rotation support shaft 123 has an oval shape corresponding to the shape of the bearing hole 124. The rotation support shaft 123 is non-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 each of the cylindrical bearings 129, 129 is provided in a semicircular recess 130, 130 formed in each of the bearing portions 127, 127. Mated. The worm / worm gear shaft 126 has a worm 131 and a worm gear 132 shown in FIG.
The two-stage gear 122 includes a small diameter gear 133 and a worm gear 134.
The two-stage gear 122 is rotatably supported on the rotation support shaft 123 such that the worm gear 134 is meshed with the worm 131.

FIG. 26 and FIG.
An opening 135 is formed at a position corresponding to the circular opening 112, as shown in FIG.
A bottomed cylindrical projection 136 for mounting a motor is formed near the lower portion. The front end face of the drive motor M2 is in close contact with the bottomed cylindrical projection 136, and is screwed and fixed to the motor mounting board 119 with a pair of screws. A worm 137 is fixed to the output shaft 45 of the drive motor M2. The worm 137 is meshed with the worm gear 132, an opening 138 facing the rotation area of the worm gear 132 is formed in the motor mounting board 119, and a cylinder for supporting the other end 123 b of the rotation support shaft 123. The bearing 139 is formed so as to protrude, and a positioning fitting hole 140 into which the positioning protrusion 121 formed at the lower portion of the support bracket 111 is fitted is formed. The motor mounting board 119 is fitted to the support bracket 111 with the screws 120 ′ in a state where the positioning fitting hole 140 is fitted to the positioning protrusion 121, and the other end 123 b of the rotating support shaft 123 is inserted through the cylindrical bearing 139. Fixed. The upper end of the motor mounting board 119 is shown in FIGS.
As shown in FIG. 8, the cover mounting plate portion 141 is bent to form a cover mounting plate portion 141, and a screw hole 142 is formed in the cover mounting plate portion 141.

FIG. 1 shows the lower peripheral portion of the disc-shaped rotating substrate 83.
The O-ring 143 is fitted as shown in FIG.
Is fitted to the disc-shaped rotating board 83 via an O-ring 143 and is fixed to the motor mounting board 119 by screws 144. As shown in FIG. 25, the upper cover 84 has a substantially square opening 145 at the front thereof, and a screw hole (not shown) formed at a corner of the peripheral wall of the opening.
A substantially square lid member 146 is screwed into the opening 145 by a screw member 147 as shown in FIG.
The lid member 146 has a shape corresponding to the opening peripheral wall of the upper cover 84. The guide hole 14 is provided at the center of the lid member 146.
An annular peripheral wall 149 is formed on the front surface of the cover member 146 so as to surround the guide hole 148. An annular step 150 for mounting packing and a plurality of positioning protrusions 151 are formed on the back of the lid member 146.

The packing 152 includes the upper cover 84 and the lid member 1.
46, a stepped portion 153 closely contacted with the annular stepped portion 150 and the lid member 146, and a cylindrical portion 154. A positioning hole 155 to be fitted to the positioning projection 151 is formed in the step portion 153. The cylindrical portion 154 is formed with a plurality of annular grooves 156 extending circumferentially around the outer circumference and the inner circumference at intervals in the axial direction to improve sealing performance and minimize rotation of the mirror mounting shaft 157. It is set not to disturb. The mirror mounting shaft 157 has a ball joint portion (not shown) at the front end, a circular flange portion 158 (see FIGS. 1 and 25) at an intermediate portion, and an insertion shaft portion 159 at a rear end. The flange portion 158 is formed with a circular fitting step 160 which 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 insertion shaft portion 159 of the mirror mounting shaft 157 has the configuration shown in FIGS.
The rotation transmission intermediate cylinder 162 shown in FIG. 32 is inserted. still,
The mirror body 3 shown in FIG.
The same thing as 03 is rotatably attached.

The rotation transmission mediating cylinder 162 has a cylinder hole 163 formed along the axis at the center, and a flange 164 for setting a friction clutch plate at the front. An engagement projection 16 for positioning a friction clutch plate 165 shown in FIG.
6 are formed.

A positioning projection 168 for positioning the friction clutch plate 167 shown in FIG. 25 is formed on the back surface of the flange portion 164. Escape grooves 169 and 170 are formed on the front and back surfaces of the flange portion 164 so as to go around the bases of the projections 166 and 168, respectively. The role of the escape grooves 169 and 170 is the same as the role of the escape groove 79. The friction clutch plates 165 and 167 are formed by pressing a friction plate on a metal plate, and have the same shape as the friction clutch plate 76 shown in FIGS. 12 and 13. 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 transmission medium cylinder 162.
The rotation transmission mediating cylinder 162 includes friction clutch plates 165 and 167.
Is carried through the bearing cylinder 114, and when the support bracket 111 is inserted into the bearing cylinder 114, the reduction gear 1
73 is a gear mounting portion 1 in a state of being meshed with the small diameter gear 133.
68 '. Insertion shaft part 1 of mirror mounting shaft 157
59 is projected from the support bracket 111 toward the motor mounting board 119 through the cylindrical hole 163 of the rotation transmission mediating cylinder 162 such that the engaging notch 161 of the flange portion 158 faces the engaging projection 115. The insertion shaft part 1
59, a presser foot 175 shown in FIG.
9 (having the same shape as the receiving groove 108) is formed in the circumferential direction thereof. A pressing spring 176 is inserted through the insertion shaft portion 159 from the rear end, and the pressing spring 176 is
Compressed. 177 is a spring receiving plate. The mirror mounting shaft 157 is urged by the pressing spring 176 in a direction in which the flange portion 158 approaches the support bracket 111, and the flange portion 158 and the friction clutch plate 165 are pressed.
The surfaces of the friction clutch plate 167 and the sliding contact plate 117 that are opposed to each other are brought into close contact with each other. Here, the clutch plate 165 and the flange 1
58 between the clutch plate 167 and the sliding contact plate 117.
Is set to be equal to or smaller than the frictional force between.

When the drive motor M2 is rotated, the rotation is transmitted to the reduction gear 173 via a warm-worm gear. Since the rotation transmission intermediate cylinder 162 is configured to be integrally rotatable with the reduction gear 173, the rotation transmission intermediate cylinder 1
62 rotates integrally with the reduction gear 173. When the rotation transmission intermediate cylinder 162 rotates, the pair of clutch plates 165, 16
7 rotates together with the rotation transmitting intermediate cylinder 162, and the mirror mounting shaft 157 is rotated via the clutch plate 165 within the range of arrow BB as shown in FIG. Mirror mounting shaft 1
57 rotates by a predetermined angle, and the engagement protrusion 115
, The rotation of the mirror mounting shaft 157 stops. If the drive motor M2 is still energized, the frictional force between the clutch plate 165 and the flange portion 158 will be overcome, and the rotation transmission intermediate cylinder 162 will idle. This prevents an excessive load from being applied to the drive motor M2.

Further, the power supply to the drive motor M2 is cut off,
When the rotation of the mirror mounting shaft 157 is stopped at a predetermined position, the mirror mounting shaft 157 is held at the predetermined position by the frictional force between the friction clutch plate 165 and the flange portion 158. Also, it is possible to prevent the adjustment position of the mirror body 303 from being shifted.

When an external force for forcibly rotating the mirror mounting shaft 157 is applied, the clutch plate 167 and the sliding contact plate 1
17 between the clutch plate 165 and the flange 1
58 is set to be substantially equal to or larger than the frictional force between the clutch plate 165 and the flange portion 158 when the mirror mounting shaft 157 is rotated. Only the rotation rotates, and the rotation transmission intermediate cylinder 162 does not rotate. Therefore, the mirror mounting shaft 157
Even if an unexpected external force is applied to the reduction gear, the external force is prevented from being applied to the reduction gear.

FIG. 33 shows a modification of the clutch mechanism for transmitting the rotation of the drive motor M1 of the base housing body 1 to the rotating housing body 2, and a pair of clutch bases 200, 2
The friction plates 202 and 203 are formed on one surface of the clutch base 101 by pressure bonding.
4 is inserted through the rotation transmitting shaft 94 with the rotation of the clutch base 200, 201
Is transmitted to the sliding contact plate 204 via the sliding contact plate 204 so as to be transmitted to the disk-shaped rotating substrate 83 of the rotating housing body 2.

In FIG. 33, reference numeral 205 denotes an engagement piece fitted into the positioning hole 93, and the friction clutch plate 99 shown in FIG. 19 except that the sliding contact plate 204 does not have a friction plate. And clutch bases 200 and 201
Is the same shape as the clutch base 96 shown in FIG. 18 except that it has a friction plate. This has the disadvantage that the number of parts is one more than that of a clutch mechanism using a friction clutch plate 99 having friction plates on both sides, but the rotation transmission can be performed without increasing the diameter of the clutch plate as compared with the prior art. Power can be secured.

[0040]

The electric mirror according to the present invention is constructed as described above. When an external force for rotating the shaft is applied to the mirror body, the rotation is not transmitted to the rotation transmission gear via the shaft. When the is rotated by the drive motor, the rotation of the rotation transmission gear can be reliably transmitted to the shaft, and when the rotation range of the shaft is regulated, the shaft reaches the end of the rotation range and the rotation of the shaft is stopped. When it becomes impossible, it is possible to prevent the drive motor from burning by making the rotation transmission gear idle around the shaft.

[Brief description of the drawings]

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

FIG. 2 is a plan view of a mounting board part.

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

FIG. 4 is a bottom view of the mounting board unit.

FIG. 5 is an explanatory view showing a gear configuration of a rotation mechanism.

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

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

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

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

FIG. 10 is also a circuit diagram for preventing noise.

FIG. 11 is a front view of the mounting board unit.

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

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

FIG. 14 is a bottom view of the disk-shaped rotating board.

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

FIG. 16 is a front view of the rotation transmission shaft with a part thereof cut away.

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

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

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

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

FIG. 21 is a sectional view taken along the line DD in FIG. 19;

FIG. 22 is a plan view of a part of the rotating housing body, similarly cut away.

FIG. 23 is a vertical sectional view of the disk-shaped rotating board.

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

FIG. 25 is an enlarged sectional view of a main part of the rotating housing body.

FIG. 26 is also a rear view in which a part of the electric mirror is cut away.

FIG. 27 is an explanatory view showing a gear configuration of the rotation transmission mechanism.

FIG. 28 is a vertical sectional view of the motor mounting board.

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

FIG. 30 is a front view of the rotation transmission intermediate tube.

FIG. 31 is a plan view of the rotation transmission intermediate tube.

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

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

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Base housing body 2 ... Rotating housing body 157 ... Mirror mounting shaft 158 ... Flange part 162 ... Rotation transmission mediating cylinder 165,167 ... Friction clutch plate 173 ... Reduction gear M2 ... Drive motor

──────────────────────────────────────────────────続 き Continuation of the front page (56) References Japanese Utility Model 1987-67847 (JP, U) Japanese Utility Model 1987-185644 (JP, U) Japanese Utility Model 1987-68838 (JP, U) Japanese Utility Model 2 75352 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) B60R 1/07

Claims (1)

(57) [Claims] A rotatable rotating housing provided on a fixed base housing at a front portion of a vehicle body; a driving mechanism for rotating the rotatable housing is installed on the base housing; the dynamic housing body is installed rotating mechanism for rotating the mirror body mounting shaft to the tip, the shaft is rotatably supported by the bearing portion of the front Kikaido housing body, wherein the rotation mechanism and the drive motor the shaft A rotation transmission gear for transmitting the rotation of the drive motor, and a rotation transmission intermediate cylinder at the rear end of the shaft.
The rotation transmission intermediate cylinder is inserted into the rotation transmission intermediate cylinder, and a flange portion for supporting a pair of friction clutch plates is formed, and the pair of friction clutch plates are attached to the flange portion so as to sandwich the flange portion from its thickness direction. The one friction surface of the pair of friction clutch plates faces the sliding contact surface of the bearing portion,
The friction surface of the other friction clutch plate faces the sliding contact surface of the press-contact flange portion formed on the shaft, and a gear meshed with the last stage of the rotation transmission gear is provided at the rear end of the rotation transmission intermediate cylinder. The shaft is urged in a direction in which the press-contact flange portion is in close contact with the bearing portion, and the rotational force of the drive motor is applied to the shaft via a friction clutch plate installed in the rotation transmission intermediate cylinder. An electric mirror, which is transmitted to a shaft.