JPH06144114A - Electric mirror - Google Patents

Abstract

PURPOSE:To provide an electric mirror surely transmitting the rotation of a transmission gear to a shaft when the rotation of the shaft is not transmitted to the transmission gear via the shaft and the shaft is rotated by a motor and idling the transmission gear to prevent the seizure of the motor when the rotating area of the shaft is restricted. CONSTITUTION:The driving mechanism of a housing body 2 is installed on the housing body 2, a mirror body fitting shaft 157 is supported on a bearing section, a gear 173 transmitting the rotation of a motor is installed, a medium tube 162 is freely coupled, and a flange 158 bearing a pair of friction clutch plates 165, 167 is formed. The friction clutch plates 165, 167 are fitted to pinch the flange section 158 from the thickness direction, the friction face of the friction clutch plate 165 is faced to the slide face of the bearing section, the friction face of the friction clutch plate 167 is faced to a pressure contact flange section formed on the shaft 157, the gear 173 is integrally rotatably fitted to the medium tube 162, and the rotating force of the motor is transmitted to the shaft 157 via the friction clutch plates 165, 167.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention fixes a base housing body to a stay installed at the front part of a vehicle body, and provides a rotatable housing body on the base housing body so that the rotary housing body can rotate. The present invention relates to an electric mirror that is provided with a shaft and rotates a mirror body attached to the tip of the shaft in the left-right and up-down directions.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 34, a double-ended 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 on a passenger side of a cab 300,
It is known that an electric mirror 302 as an outside mirror is fixed to the stay 301.

This conventional electric mirror 302 includes a stay 3
A base housing body 304 having a rotating mechanism for rotating the mirror body 303 in the left-right direction about 01 and a rotating housing body 305 having a rotating mechanism for rotating the mirror body 303 in the vertical direction are provided. There is.

The base housing body 304 is provided with a drive motor, a rotation transmission gear, a clutch mechanism, etc. for rotating the rotary housing body 305 in the left-right direction. Further, the rotation housing body 305 is provided with a drive motor, a rotation transmission 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]

By the way, the clutch mechanism is interposed between the shaft and the rotation transmission gear in order to keep the position of the mirror body constant, but the external force for rotating the shaft is applied to the mirror body. It is desirable to prevent the rotation of the rotation transmission gear from being transmitted to the rotation transmission gear through the shaft when it 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 surely transmitted to the shaft. Is desirable.
Further, when the rotation range of the shaft is regulated, when the shaft reaches the end of the rotation range and the shaft cannot rotate, the rotation transmission gear idles with respect to the shaft to drive the drive motor. It is desirable to have a structure that prevents burning.

The present invention has been made from the above viewpoint, and an object thereof is that when an external force for rotating the shaft is applied to the mirror body, the rotation is transmitted to the rotation transmission 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 range of the shaft is restricted, the shaft reaches the end of the rotation range. It is an object of the present invention to provide an electric mirror capable of preventing the drive motor from being burned by making the rotation transmission gear idle around the shaft when the rotation of the shaft becomes impossible.

[0008]

According to the present invention, a rotating housing body is rotatably provided on a base housing body fixed to a front portion of a vehicle body according to the present invention, and the rotating base housing body is provided for rotating the rotating housing body. A drive mechanism is installed, a rotary mechanism for rotating a shaft attached to the mirror body is installed at a tip of the rotary housing body, and a rear side of the shaft is rotatably supported by a bearing portion of the rotary housing body. A drive motor and a rotation transmission gear that transmits the rotation of the drive motor to the shaft are installed in the rotation mechanism, and a rotation transmission medium cylinder is loosely fitted to a rear end portion of the shaft, and the rotation transmission medium cylinder is attached to the rotation transmission medium cylinder. Is formed with a flange portion that carries a pair of friction clutch plates, and the pair of friction clutch plates are attached to the flange portions so as to sandwich the flange portions from the thickness direction. The friction surface of one of the pair of friction clutch plates faces a sliding contact surface of the bearing portion, and the friction surface of the other friction clutch plate faces a sliding contact surface of a pressure contact flange portion formed on the shaft, A gear meshed with the final stage of the rotation transmission gear is integrally rotatably mounted on a rear end portion of the rotation transmission medium cylinder, and the shaft is urged in a direction in which the pressure contact flange portion is in close contact with the bearing portion. Is
An electric mirror, wherein the rotational force of the drive motor is transmitted to the shaft via a friction clutch plate installed in the rotation transmission medium cylinder.

[0009]

According to the electric mirror of the present invention, when the drive motor installed in the rotary housing is rotated, the rotation is transmitted to the rotation transmission medium cylinder via the rotation transmission gear.
Then, the rotation of the rotation transmission medium cylinder is transmitted to the shaft by the frictional force between the pressure contact flange portion mounted on the rotation transmission medium cylinder and the friction clutch plate facing the pressure contact flange portion. Even if an external force for rotating the shaft is applied to the shaft, the rotation transmission medium cylinder is not rotated by the frictional force between the bearing portion and the friction clutch plate facing the bearing portion.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an electric mirror according to the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a base housing body, and 2
Is a rotating housing body. The base housing body 1 is generally composed of a mounting substrate portion 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 the 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. Large diameter circular part 5
An annular peripheral wall 8 is formed on the lower part of the upper part of the lower part of the upper part of the upper part. As shown in FIGS. 1 and 3, the small-diameter circular portion 7 is provided 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 is divided by four screw members 13 with the stay 6 set in the divided semicircular cylinder portion 12. The stay 6 is fastened to the semi-circular cylinder 12
Are clamped by the circular clamping cylinder 9. This allows the stay 6
The electric mirror is fixed to.

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 the inner annular peripheral wall 1
An annular groove 16 for mounting the lower cover is formed between the outer peripheral wall 14 and the outer peripheral wall 15. The O-ring 1 is placed in the annular groove 16.
7 is installed. The inside of the inner annular peripheral wall 14 is a rotation mechanism installation space. As shown in FIG. 4, two screw holes 18, 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, 19 projecting downward are formed inside the inner annular peripheral wall 14.
Screw holes 20 and 20 for screwing the lower cover are formed in 9 and 19, respectively. The lower cover 4 is screwed to the large-diameter circular portion 5 by using 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, the inner annular peripheral wall 1 is provided.
Inside the 4, the worm as a component of the rotation mechanism
Rotation of a pair of bearings 23, 24 for supporting both ends of the worm gear shaft 22 (see FIGS. 5 and 6), a bearing part 25 for supporting an intermediate part of the worm / worm gear shaft 22, and a two-stage gear 26. Oval bearing hole 28 supporting the support shaft 27
A circular through hole 29 penetrating in the vertical direction, and a screw hole 3 for mounting the motor mounting board 30 (see FIGS. 7 and 8).
One boss portion 32 having 1 is formed. The shape of the motor mounting board 30 will be described later.

Positioning protrusions 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. Bearing cavities 35 (see FIG. 5) are fitted in the recesses 23a and 24a of the pair of bearings 23 and 24 (the other bearing is not shown), and both ends of the worm / worm gear shaft 22 are fitted. 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 this end portion 27a is fitted into an oval bearing hole 28 and is non-rotatably supported by the large-diameter circular portion 5. It 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 has a reduction gear 41 having an oval-shaped mounting hole 40 (see FIG. 5).
Meshed with. As shown in FIG. 7, the motor mounting board 30 supports a screw insertion hole 42 opposed to each screw hole, a positioning hole 43 fitted into the positioning protrusion 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 output shaft 4 of the drive motor M1 shown in FIG.
A standing wall 47 that supports the resin bearing 46 of No. 5 is formed.

The front end surface of the drive motor M1 is a screw member 4
It is fixed to the standing wall 44 by 8, 48. The output shaft 45 of the drive motor M1 is provided with a worm 49, and the worm 49 is meshed with the worm gear 37. The resin bearing 46 is fitted into the standing wall 47, and the tip of the output shaft 45 is rotatably supported by the resin bearing 50. As shown in FIGS. 3, 7, and 8, the worm gear 3 is mounted on the motor mounting board 30.
A notch 51 is formed so that 7 faces the worm 49. The opening 5 facing the worm 36 on the motor mounting board 30
1'is formed. The rear end of the drive motor M1 is shown in FIG.
A circuit board 52 for noise prevention is provided as shown in FIG.

FIG. 9 shows a plan view of the circuit board 52. This circuit board 52 has three capacitors 53, 5
4, 55 and one thermistor 56 for preventing overcurrent are provided. The thermistor 56 is partially omitted in the drawing. The circuit board 52 includes a drive motor M1 and a drive motor M.
2 (see FIG. 1). This circuit board 52
A circuit diagram of the above 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.

The circuit pattern 59 includes capacitors 53 and 5
4 is connected to one leg, 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.
It is done by inserting it into the insertion hole and soldering.
A grounding lead wire 64 is drawn out from the circuit pattern 59, and a grounding piece 65 is provided at the drawn-out end as shown in FIG.
Is provided. 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. Lead wires 69 and 70 are drive motors M
The lead wires 66, 67, 68 are connected to the two power supply terminals 45 ', 45', respectively, and are bundled by a wire tube and guided to the connector. The lead wires 66 and 67 are used to supply power to the drive motor M1, and the capacitors 53 and 55 are used.
By the action of, noise can be reduced. Lead wire 69,
70 is 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 portion. Engagement protrusions 72 that regulate the rotation angle of the body 3 are formed.

An O-ring 73 is fitted on the outer circumference of the circular boss portion 71. The circular through hole 29 has a circular boss portion 71.
It is provided in the center of. A bush member 75 (see FIG. 1) having a flange portion 74 at the bottom is fitted into the circular through hole 29. The upper surface 71a of the circular boss portion 71 is a clutch plate setting surface. A ring plate-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. Circular boss 7
An engaging projection 78 is formed in the circumferential direction of the clutch 1 so as to correspond 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 engaging projection 78. The relief groove 79 contributes to the flattening of the upper surface 71a when the clutch plate 76 is set (prevents the clutch plate 76 from being tilted and set due to foreign matter attached 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 erroneous attachment of the upper and lower surfaces of the clutch plate 76 to the upper surface 71a.

As shown in FIG. 1, the rotating housing body 2 is composed of a disk-shaped rotating substrate 83 and an upper cover 84. As shown in FIG. 14, on the lower surface of the disc-shaped rotary substrate 83, there are provided 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 projection 87. Has been 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 with it, 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 projection 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 rotary substrate 83 has an annular peripheral wall 86 with the rotary shaft cylinder 85 inserted into the bush member 75.
Is rotatably mounted on the mounting base plate 3 by fitting it to the circular boss 71 via the O-ring 73, and the sliding contact plate 88 and the friction plate 82 of the clutch plate 76 face each other.

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 for each 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 rotation transmitting shaft 94 as shown in FIG. As shown in FIG. 17, engagement protrusions 97 for positioning the clutch base 96 (see FIG. 18) are formed in the lower portion of the holding flange 95 in the circumferential direction. An escape groove 98 is formed in the base portion of the engaging projection 97 to surround the base portion. The escape groove 98 has the same role as 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. Clutch plate 9
As shown in FIGS. 19 to 21, reference numeral 9 is formed by friction plates 101, 101 being pressure-bonded to both end faces of a metal plate 100.
Engagement pieces 102, 102, 102 are formed on the outer peripheral side of the metal plate 100, and are curved downward to 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, the rotation transmitting shaft 94 has an oval gear mounting portion 105 formed on its shaft portion 104. The gear mounting portion 105 projects to 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 the rear of the reduction gear 41. The guide hole 1 is provided at the center of the rotation transmission shaft 94.
07 are formed. Power supply terminal 45 of drive motor M2
Lead wire 6 soldered to ', 45' (see FIG. 1)
9 and 70 are guided from the rotary 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 No. 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 engaging 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. ing. Presser spring 1
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 elastically urging force of the 06 causes the surfaces of the clutch mechanism facing each other to come into close contact with each other.

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. 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, the clutch plate 9 is not provided.
The friction area can be secured without increasing the diameter of 9 to increase the friction area. That is, the rotational force of the rotation transmission shaft 94 is generated by the friction force between the clutch base 96 and the friction plate 101 slidingly contacting the clutch base 96 and the friction force between the pressing flange 95 and the friction plate 101 slidingly contacting the clutch plate 9.
9, and the rotating housing body 2 is rotated by the clutch plate 99. As a result, the mirror body
As shown in FIG. 2, the stay 6 is swung in the left-right direction (direction of arrow A). When the rotary housing body 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. 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 9
4 spins idle. As a result, it is possible to prevent an excessive load from being applied to the drive motor M1, and to prevent the drive motor M1 from burning. The clutch plate 76 interposed between the circular boss portion 71 and the disc-shaped rotating base plate 83 plays a role of holding the rotating position of the rotating housing body 2.

The disk-shaped rotating substrate 83 has a structure as shown in FIGS.
As shown in, a support bracket 111 is formed upright on the upper part thereof. The support bracket 111 is formed with a circular opening 112 through which a rotation transmission medium cylinder described later is inserted, and the circular opening 112 has a bearing cylinder 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 engaging projection 115 for limiting the rotation range of a mirror mounting shaft (shaft) described later is formed in the peripheral wall portion of the circular opening 112 and at the lower portion thereof. Positioning protrusions 116 are formed around 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 screwing portions 118, 118, 118. The screw screwing portion 118 is formed corresponding to the screw insertion hole of the motor mounting board 119 shown in FIG. Support bracket 1
Positioning protrusions 121 are formed on the lower portion of 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) and the bearings 127 and 127 for supporting both ends of the resin bearing 125 and the worm / worm gear shaft 126 (see FIG. 27) for receiving the output shaft 45 (see FIG. 1) of the drive motor M2 and the worm. The bearing portion 128 supports the 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, 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 includes 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.

The motor mounting board 119 is shown in FIGS.
As shown in FIG. 3, an opening 135 is formed at a position corresponding to the circular opening 112 to allow the projection of a mirror mounting shaft, which will be described later,
A bottomed cylindrical projection 136 for mounting the motor is formed near the lower portion thereof. The front end surface 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 by 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, 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 projection 121 is fitted into the positioning fitting hole 140, and the other end 123b of the rotary support shaft 123 is inserted into 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.

The disk-shaped rotary substrate 83 is shown in FIG.
The O-ring 143 is fitted as shown in FIG.
Is fitted to the disc-shaped rotating substrate 83 via the O-ring 143 and fixed to the motor mounting substrate 119 by the screw 144. 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 substantially square lid member 146 is screwed into the opening 145 by a screw member 147.
The lid member 146 has a shape corresponding to the peripheral wall of the opening of the upper cover 84. A guide hole 14 is provided at the center of the lid member 146.
8 is formed, 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 includes an upper cover 84 and a lid member 1.
It has a stepped portion 153 interposed between 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 that 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 as much as possible. It is set not to interfere. The mirror attachment 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 formed 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 insertion shaft portion 159 of the mirror mounting shaft 157 is shown in FIG.
The rotation transmission medium cylinder 162 shown in FIG. 32 is inserted. still,
The ball body 3 has a mirror body 3 shown in FIG.
The same as 03 is rotatably attached.

The rotation transmitting medium cylinder 162 is formed with a cylinder hole 163 along the axis at the center and a flange 164 for setting the friction clutch plate at the front. An engaging projection 16 for positioning the friction clutch plate 165 shown in FIG. 25 is provided on the front surface of the flange portion 164.
6 is formed.

A positioning projection 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 pressure-bonding a friction plate to 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 gear mounting portion 168 'that engages with an oval 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 includes friction clutch plates 165 and 167.
When the support bracket 111 is inserted into the bearing tube 114, the reduction gear 1
Reference numeral 73 denotes the gear mounting portion 1 in a state of being meshed with the small diameter gear 133.
It is attached to 68 '. Insertion shaft part 1 of the mirror mounting shaft 157
59 is projected from the support bracket 111 toward the motor mounting board 119 through the cylinder hole 163 of the rotation transmission medium cylinder 162 such that the notch 161 for engagement of the flange portion 158 faces the engagement protrusion 115. The insertion shaft 1
At the rear end of 59, presser foot 175 (presser foot 10
A receiving groove (having the same shape as 9) (having the same shape as the receiving groove 108) is formed in the circumferential direction. A pressing spring 176 is inserted from the rear end into the insertion shaft portion 159, and the pressing spring 176 is provided with a presser foot 175.
Compressed by. 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.
The surfaces of the friction clutch plate 167 and the sliding contact plate 117 that are opposed to each other are in close contact with each other. Here, the clutch plate 165 and the flange portion 1
The friction force between the clutch plate 167 and the sliding contact plate 117 is
It is set to be less than or equal to the frictional force between and.

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 integrally rotatable with the reduction gear 173, the rotation transmission medium cylinder 1
62 rotates integrally with the reduction gear 173. When the rotation transmission medium cylinder 162 rotates, the pair of clutch plates 165, 16
7 integrally rotates with the rotation transmission medium cylinder 162, and the mirror mounting shaft 157 is rotated within the range of the arrow BB as shown in FIG. 29 via the clutch plate 165. Mirror mounting axis 1
57 rotates by a predetermined angle, and the engagement projection 115 is cut out by the notch 161.
When it engages with the end portion 161a of the mirror mounting shaft 157, the rotation of the mirror mounting shaft 157 is stopped. If the drive motor M2 is still energized, the frictional 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.

Further, the power supply to the drive motor M2 is cut off,
When the rotation of the mirror mounting shaft 157 is stopped at the 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. Moreover, the adjustment position of the mirror body 303 is prevented from being displaced.

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

FIG. 33 shows a modified example of the clutch mechanism for transmitting the rotation of the drive motor M1 of the base housing body 1 to the rotary housing body 2, which is a pair of clutch bases 200, 2.
Friction plates 202 and 203 are pressure-bonded to one surface of 01, and the sliding contact plate 20 is provided between the pair of clutch bases 200 and 201.
4 is inserted into the rotation transmission shaft 94 to interpose the rotation of the rotation transmission shaft 94 into the clutch bases 200, 201.
By transmitting to the sliding contact plate 204 via the, the disc-shaped rotary substrate 83 of the rotary housing body 2 is transmitted.

In FIG. 33, reference numeral 205 denotes an engaging 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. And the clutch bases 200 and 201
18 has the same shape as the clutch base 96 shown in FIG. 18 except that it has a friction plate. This one 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 rotation transmission is possible without increasing the diameter of the clutch plate as compared with the conventional one. You can secure power.

[0040]

Since the electric mirror according to the present invention is configured 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, while the shaft is not transmitted. When the drive motor is rotated, the rotation of the rotation transmission gear can be reliably transmitted to the shaft, and when the rotation range of the shaft is restricted, the shaft reaches the end of the rotation range and the rotation of the shaft is prevented. 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 drawings]

FIG. 1 is a vertical cross-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 157 ... Mirror mounting shaft 158 ... Flange portion 162 ... Rotation transmission medium cylinder 165, 167 ... Friction clutch plate 173 ... Reduction gear M2 ... Drive motor

[Procedure amendment]

[Submission date] January 20, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Claim 1

[Correction method] Change

[Correction content]

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction content]

[0008]

The electric mirror according to the present invention
A rotary housing body is rotatably provided on a fixed base housing body at the front part of the vehicle body, and a drive mechanism for rotating the rotary 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 installed, a rotation transmission medium cylinder is inserted into the rear end of the shaft, and a pair of friction clutch plates are mounted on the rotation transmission medium cylinder. A flange portion to be held is formed, and the pair of friction clutch plates are attached to the flange portion so as to sandwich the flange portion from the thickness direction, and one friction surface of the pair of friction clutch plates is The friction surface of the other friction clutch plate is opposed to the sliding contact surface of the bearing portion, and the friction surface of the friction clutch plate is opposed to the sliding contact surface of the pressure contact flange portion formed on the shaft. A gear meshed with the final stage of the transmission gear is integrally rotatably mounted, and the shaft is biased in a direction in which the pressure 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.

Claims (1)

[Claims] 1. A rotary housing body is rotatably provided on a fixed base housing body at a front portion of a vehicle body, and a drive mechanism for rotating the rotary housing body is installed on the base housing body. A rotating mechanism for rotating a shaft attached to the mirror body is installed at a tip of the moving housing body, and a rear side of the shaft is rotatably supported by a bearing portion of the rotating housing body. A rotation transmission gear that transmits rotation of the drive motor is installed on the shaft, a rotation transmission medium cylinder is loosely fitted to a rear end portion of the shaft, and a pair of friction clutch plates are mounted on the rotation transmission medium cylinder. A flange portion to be held is formed, and the pair of friction clutch plates are attached to the flange portion so as to sandwich the flange portion from the thickness direction thereof. One friction surface faces the sliding contact surface of the bearing portion, and the friction surface of the other friction clutch plate faces the sliding contact surface of the pressure contact flange portion formed on the shaft,
A gear meshed with the final stage of the rotation transmission gear is integrally rotatably mounted on a rear end portion of the rotation transmission medium cylinder, and the shaft is urged in a direction in which the pressure contact flange portion is in close contact with the bearing portion. And a rotational force of the drive motor is transmitted to the shaft via a friction clutch plate installed in the rotation transmission medium cylinder.