JPH0561514U - Bolt rotation stop mechanism - Google Patents

Abstract

(57) [Summary] [Purpose] It is an object to provide a rotation stopping mechanism for a bolt that is inexpensive. [Structure] The plate 14 is provided with an engaging groove 144, and the head portion 371 of the shaft screw 370 is provided with a flange portion 372 for engaging with the engaging groove 144 to prevent the shaft screw 370 from rotating. As a result, the flange portion 372 of the shaft screw 370 is engaged with the engaging groove 1
When it is engaged with 44, the shaft screw 370 is prevented from rotating. In this way, since no coating material or adhesive is used, no time or cost is required. Moreover, the plate 14 is provided with the engaging groove 144 so that the one-shaft screw 3
A head portion 371 of 70 is provided with a collar portion 372, and the collar portion 372
Since it has a structure for engaging with the engaging groove 144 to prevent rotation, it is possible to prevent rotation even in a narrow space where flat washers, spring washers, lock nuts, etc. cannot be used.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention is a bolt rotation stopping mechanism for fastening a plurality of parts, and for example, even if there is a narrow space where a washer or the like cannot be used or there is a relative positional relationship between the parts and the bolts. The present invention relates to a bolt anti-rotation mechanism that can prevent the bolt anti-rotation, and particularly relates to a bolt anti-rotation mechanism that is inexpensive.

[0002]

[Prior Art]

 Hereinafter, a conventional bolt rotation preventing mechanism will be described with reference to FIGS. 6 to 18. This example is used for an electric retractable door mirror of a car. In FIG. 6, reference numeral 1 denotes a mirror base fixed to a vehicle body, for example, an automobile door (not shown). 6 and 8, reference numeral 2 denotes a shaft holder fixed to the mirror base 1. A hollow shaft 3 is integrally provided on the shaft holder 2, and a chamfered portion 4 for stopping rotation is provided on the shaft 3. An engaging groove 5 is provided on the upper end of the shaft 3 in the circumferential direction. A pair of arcuate grooves 6 are provided on the fixed surface of the upper surface of the shaft holder 2 along the arc locus of a ball 12 incorporated in a mirror assembly 7 described later. As shown in FIG. 17, the arcuate groove 6 has a stepped portion 60 on the use position side and a stepped portion 61 on the storage position side with a height H cut up at right angles on both ends thereof. The bottom surface of the above-mentioned arcuate groove 6 may be smooth, and may be gently convex upward as shown by the chain double-dashed line in FIG. 17, for example. In FIG. 6, reference numeral 7 denotes a mirror assembly, which is a unit bracket 8 rotatably supported by a washer 210 on the shaft 3, a mirror housing 9 fixed to the unit bracket 8 and a power unit 10. And a mirror 11 mounted on the power unit 10 so as to be tiltable in the vertical and horizontal directions and arranged at the front opening of the mirror housing 9. As shown in FIG. 8, the unit bracket 8 includes a base portion 81, a storage portion 82 for storing the clutch mechanism 15 and the speed reduction mechanism 24, which will be described later, and a mounting portion 83 for mounting the power unit 10 and the like. Become. Two hemispherical recesses are provided in the lower surface of the unit bracket 8 facing the pair of arcuate grooves 6 of the shaft holder 2, and two recesses are provided in each of the two recesses. The balls 12 are fitted so that they can roll. When the ball 12 hits the step portion 60 on the use position side as shown by the solid line in FIG. 17, the mirror assembly 7 is in a state of protruding laterally from the vehicle body as shown by the solid line in FIG. Located in use position. Further, when the ball 12 is hitting the stepped portion 61 on the storage position side as shown by the one-dot chain line in FIG. 17, the mirror assembly 7 moves along the vehicle body as shown by the one-dot chain line in FIG. It is located at the storage position in a state of being tilted rearward. Further, when the ball 12 rides on the arcuate groove 6 in the direction of arrow A and is positioned on the fixed surface of the shaft holder 2 as shown by the chain double-dashed line in FIG. As a result of the buffer rotation, the vehicle is tilted forward along the vehicle body as shown by the chain double-dashed line in FIG. The steps 60 and 61 and the balls 12 at both ends of the arcuate groove 6 constitute a stopper that physically and forcibly stops the mirror assembly 7 as a moving body at a predetermined stop position. .. Further, the height H of the stepped portions 60 and 61 of the arcuate groove 6 and the ball 12 serve as a stopper that is not ridden by the torque of the motor 13, which will be described later, but is ridden by manual operation or buffer rotation. In FIG. 10, reference numerals 22 and 23 denote projections projecting on the fixed surface of the upper surface of the shaft holder 2 and semicircular arc grooves provided on the rotating surface of the lower surface of the unit bracket 8, and the projections 22 are the grooves 23. It is slidably fitted to and serves as a guide for rotational displacement of the mirror assembly 7 with respect to the shaft 3 (shaft holder 2). In FIGS. 9 and 11, 14 is a die-cast plate fixed to the unit bracket 8 by bolts 37 described later, and a motor mounting portion 143 is formed on the upper surface from the middle portion to one end of the plate 14 via a step portion. To project integrally. A recess 140 for bearing and thrust force is provided in the middle of the motor mounting portion 143 of the plate 14, and a through hole 141 is provided at the bottom of the recess 140. On the other hand, a concave portion 80 for bearing and thrust force reception is provided at a position facing the concave portion 140 of the unit bracket 8. In FIG. 11, reference numeral 13 denotes a motor built in the mirror assembly 7, and the motor 13 is fixed to the motor mounting portion 143 of the plate 14 fixed to the unit bracket 8 by the screw 132. The motor 13 is electrically connected to the battery 51 via a switch circuit described later. Chamfers 131 are provided on both sides of the shaft 130 of the motor 13. In FIGS. 8 and 10, reference numeral 15 denotes a clutch mechanism mounted on the shaft 3. The clutch mechanism 15 manually rotates the mirror assembly 7, or something hits the mirror assembly 7 to absorb the shock. Therefore, when the mirror assembly 7 is rotated, the moving side (movable body side) of the mirror assembly 7 and the motor 13 and the speed reduction mechanism 24, which will be described later, the fixed side (fixed body side) of the mirror base 1 and the shaft holder. The edge between the dar 2 and the shaft 3 is cut off. The clutch mechanism 15 includes a push nut 16 externally fitted onto the shaft 3 in order from above, a compression spring 17, a clutch gear 19 as a movable body, a clutch holder 20 as a fixed body, and a washer 21. Become. The clutch gear 19 is composed of a spur gear, is rotatable with respect to the shaft 3, and has a locking groove 190 on a lower surface thereof. The clutch holder 20 is fixed to the shaft 3, and an engaging claw 200 is provided on the upper surface of the clutch holder 20 so as to correspond to the engaging groove 190. The push nut 16 engages with the engagement groove 5 of the shaft 3 to compress the compression spring 17. Due to the elastic force of the compression spring 17, the locking claw 200 on the upper surface of the clutch holder 20 is locked in the locking groove 190 on the lower surface of the clutch gear 19, so that the clutch gear 19 and the clutch holder 20 are separated from each other. It is in a continuous state. Further, the elastic force of the compression spring 17 urges the shaft holder 2 through the shaft 3 in the upward direction (conversely, the unit bracket 8 through the clutch mechanism 15 in the downward direction), and as a result, the unit bracket 8 side. The ball 12 is pressed against the bottom surface of the arc-shaped groove 6 of the shaft holder 2. In FIG. 7, reference numeral 24 is a reduction mechanism arranged between the clutch mechanism 15 (and the shaft 3) and the motor 13, and the reduction mechanism 24 is attached to the shaft 130 of the motor 13 via a join 800 described later. The first worm 25, the first helical gear 26 as a first worm wheel meshing with the first worm 25, and the double-sided chamfer (which may be a D-cut surface) 31 allow the central transmission of the first helical gear 26. From a second worm 27 in which one end of a rotary shaft 47 is axially movable and non-rotatably mounted in the hole 46, and a second helical gear 28 as a second worm wheel meshed with the second worm 27. It is configured. Here, the first worm 25 and the first helical gear 26 (first worm gear) as the first worm wheel, and the second worm 27 and the second helical gear 28 (second worm wheel as the second worm wheel) Two-stage worm gear is configured by In the first worm 25, as shown in FIG. 11, a step portion 251 is provided at one end of the rotary shaft 250, and the chamfered portion 131 of the motor shaft 130 is substantially equal to the one end of the rotary shaft 250. The chamfered portion 252 is provided. One end of the rotary shaft 250 of the first worm 25 is rotatably inserted into the plate and the through hole 141 of the recess 140, and the step 251 of the rotary shaft 250 of the first worm 25 is inserted into the recess 140. The edge of the through hole 141 is rotatably abutted. On the other hand, the other end of the rotary shaft 250 of the second worm 25 is rotatably supported by the bearing recess 80 of the unit bracket 8, and the other end surface of the rotary shaft 250 of the first worm 25 is the above-mentioned. The unit bracket 8 is brought into contact with the bottom of the bearing recess 80. 7 and 9, 29 is a sparger output gear 29 coaxially fixed to the second helical gear 28, and 30 is interposed between the output gear 29 and the clutch gear 19 as the input gear. The output gear 29 and the clutch gear 19 as the input gear are in mesh with each other and are idle gears of spur gears. As a result, the clutch mechanism 15 and the reduction mechanism 24 are connected. The idle gear 30 is rotatably supported on the unit bracket 8 by a rotary shaft 300. In FIGS. 7 and 12, reference numeral 32 denotes a die-cast support which is separate from the plate 14, and the support 32 is attached to the plate 14 with screws 33 and fixed to the unit bracket 8 via the plate 14. To do. The first helical gear 26 is housed in the groove (not shown) of the plate 14, and both ends of the rotary shaft 47 of the second worm 27 are rotated by the radial bearings (not shown) of the plate 14 and the support 32. Balls 36 for thrust bearings are supported between the plate 14 and the support 32 and between the recesses (not shown) for thrust bearings of the plate 14 and the support 32 and both end surfaces of the rotary shaft 47 of the second worm 27. To do.

In FIG. 14, reference numeral 37 denotes a shaft screw as a bolt. The shaft screw 37 includes a hexagonal head portion 38 at one end (upper end), a shaft portion 39 at an intermediate portion, and a screw portion 40 at the other end (lower end). It consists of. On the other hand, the unit bracket 8 and the plate 14 are provided with through holes 84 and 142, respectively, through which the shaft screw 37 is inserted. A nut housing recess 41 is provided at the edge of the through hole 84 of the unit bracket 8. On the other hand, a U-shaped flange-shaped head pressing portion 42 as viewed from above is integrally provided at the upper edge of the through hole 142 of the plate 14, and the lower surface side of the through hole 142 of the plate 14 is provided. A boss portion 43 for sandwiching the second helical gear 28 and the output gear 29 from above and below together with the unit bracket 8 is integrally provided at the edge. Thus, the shaft portion 39 of the shaft screw 37 is inserted into the through hole 142 of the plate 14, the central through hole 48 of the second helical gear 28 and the output gear 29, and the through hole 84 of the unit bracket 8, and The screw portion 40 of the shaft screw 37 is screwed into the nut 85 housed in the recess 41 of the unit bracket 8, and a part of the head pressing portion 42 of the plate 14 is crimped to the head portion 38 of the shaft screw 37. To engage. As a result, the second helical gear 28 and the output gear 29 are rotatably supported by the shaft portion 39 of the shaft screw 37, and are axially supported between the unit bracket 8 and the boss portion 43 of the plate 14. It is fixed in the thrust direction. Further, the plate 14 and the support 32 are fixed to the unit bracket 8. Further, a part of the head pressing portion 42 of the plate 14 is crimped and engaged with the head 38 of the shaft screw 37 to prevent the shaft screw 37 from rotating.

In FIG. 7, 69 is a switch mechanism described later. The switch mechanism 69 is fixed to the upper surface of the plate 14 with a screw 690. In FIG. 10, 44 is a gear case portion provided on the unit bracket 8, 45 is a lid fitted and attached to the upper opening of the gear case portion 44, and 450 is a joint between the gear case portion 44 and the lid 45. It is a tape that adheres to your eyes. The shaft 45, the motor 13, the latch mechanism 15, the speed reduction mechanism 24, the switch mechanism and the like are covered by the lid 45 and the gear case 44. In FIG. 11, reference numeral 800 denotes a joint that connects the shaft 130 of the motor 13 and the rotary shaft 250 of the first worm 25. The joint 800 is made of, for example, resin or rubber, has a columnar shape, and has an oval connecting hole 801 with its both sides chamfered at its center axis. The joint 800 has elasticity in the twisting direction with respect to the connecting hole 801. The both ends of the connection hole 801 of the joint 800 are fitted to the chamfered portion 131 of the shaft 130 of the motor 13 and the chamfered portion 252 of the rotary shaft 250 of the first worm 25, respectively, and the motor 13 The shaft 130 and the rotary shaft 250 of the first worm 25 are connected to each other via the joint 800.

Hereinafter, the operation operation of the electric retractable door mirror configured as described above will be described. First, the motor 13 is driven. Then, the rotational force (driving force) of the motor 13 is transmitted to the idle gear 30 via the two-stage worm gear and the motor-side gear 29. Here, since the clutch gear 19 and the clutch holder 20 are in the connection state, the clutch gear 19 is in the fixed state. As a result, the idle gear 30 revolves around the clutch gear 19 while rotating on its axis. As the idle gear 30 revolves, the mirror assembly 7 rotates with respect to the shaft 3 of the mirror base 1 by an angle θ, and the mirror assembly 7 moves from the use position to the storage position or from the storage position to the use position. Rotate and displace. With the rotational displacement of the mirror assembly 7, the balls 12 on the side of the mirror assembly 7 and the unit bracket 8 roll along the arcuate grooves 6 on the side of the mirror base 1 and the shaft holder 2 in the directions of arrow B and C. When the above-mentioned ball 12 hits the stepped portion 60 or 61 of the arcuate groove 6 and physically and forcibly stops at a predetermined stop position, a switch circuit to be described later operates and the motor 13 The driving is stopped, and the mirror assembly 7 is stopped at a predetermined stop position, that is, a use position or a storage position.

FIG. 18 is an electric circuit diagram showing an embodiment of a circuit of the switch mechanism 69 in the electric retractable door mirror of the present invention described above. In the figure, 51 is a battery as a power source, and this battery 51 is a normal DC 12V battery mounted in an automobile. Reference numeral 57 denotes a switch arranged in the driver's seat. This switch 57 is a switch for switching the polarity, and in this example, a three-position changeover switch interlocking with two movable contacts is used. The switch 57 includes a first movable contact 571 and a second movable contact 572 which are interlocked with each other, a first common contact COM1 and a second common contact COM2, and a first + contact A1 connected to the + pole of the battery 51, respectively. And a second + contact A2, a first contact B1 and a second contact B2 connected to the negative pole of the battery 51, a first middle contact C1 and a second middle contact C2, respectively. In the switch 57, the movable contacts 571 and 572 described above are normally in contact with the middle contacts C1 and C2. Reference numeral 13 is the motor, and the motor 13 is connected to the switch 57 in series. That is, one terminal of the motor 13 is connected to the first common contact COM1 of the switch 57, and the other terminal of the motor 13 is connected to the second common contact COM2 of the switch 57, respectively. Reference numeral 58 is a PTC element utilizing resistance temperature characteristics. This PTC element 58 shows a switching characteristic in which the resistance value changes rapidly in a certain temperature range. For example, a polymer type PTC element (trade name Polyswitch of Raychem Co., Ltd.) is used. use. The PTC element 58 is connected in series between the motor 13 and the switch 57. That is, one terminal of the PTC element 58 is connected to the other terminal of the motor 13, and the other terminal of the PTC element 58 is connected to the second common contact COM2 of the switch 57. In this PTC element 58, the mirror assembly 7 as a moving body is physically and forcibly stopped by a stopper (steps 60 and 61 and the ball 12), and the motor 13 is overloaded. The internal current rises due to the overcurrent that sometimes occurs, and when it reaches a certain temperature range, the internal resistance value rapidly increases and switching operation occurs. The PTC element 58 is bipolar. A relay circuit 610 includes a relay 600, a normally open relay coil 601, a common contact COM, an A contact, and a B contact. The common contact COM of the relay 600 is connected to the first common contact COM1 of the switch 57, and the B contact of the relay 600 is connected to one terminal of the motor 13. One terminal of the relay coil 601 is connected via the capacitor 66 between the common contact COM of the relay 600 and the first common contact COM1 of the switch 57, and the other terminal of the relay coil 601 is connected to the PTC element. 58 and the motor 13, respectively. Reference numeral 68 denotes a resistor. One terminal of the resistor 68 is connected between the relay coil 601 and the capacitor 66, and the other terminal of the resistor 68 is connected between the B contact of the relay 600 and the motor 13. To do.

Next, the operation operation of the above electric circuit will be described. First, the switch 57 is operated to bring the movable contacts 571 and 572 into contact with the + contact A1 and the-contact B2, respectively. Then, a current flows from the capacitor 66 to the relay coil 601 for a moment, the relay coil 601 is excited, and the relay 600 switches from the A contact to the B contact accordingly. As a result, the current from the battery 51 flows in the direction of the solid line arrow, relay 600 → motor 13 → PTC element 58, so that the motor 13 rotates (normally rotates). On the other hand, a part of the current in the direction of the solid arrow flows from the resistor 68 to the relay coil 601, so that the contact state of the relay 600 with the B contact is held by itself. The rotation force of the motor 13 causes the mirror assembly 7 to rotate from the use position to the storage position as described above. Then, when the mirror assembly 7 reaches the retracted position which is the predetermined stop position, the stopper is actuated, that is, the ball 12 on the moving side hits the step 61 of the arcuate groove 6 on the fixed side, and the mirror assembly 7 moves. It is physically and forcibly stopped in the storage position which is the predetermined stop position. At this time, the motor 13 is overloaded and an overcurrent flows in the electric circuit. Due to this overcurrent, the internal temperature of the PTC element 58 rises, and when it reaches a certain temperature range, the internal resistance of the PTC element 58 rapidly increases, and the PTC element 58 performs a switching operation. Then, the energization to the relay coil 601 is cut off, the relay 600 self-recovers and switches from the B contact to the A contact, and the energization to the motor 13 is cut off. As a result, the rotation (drive) of the motor 13 is stopped, and the mirror assembly 7 is completely stopped at the storage position. Therefore, the operation of the switch 57 is stopped and the movable contacts 571 and 572 are automatically returned to the middle contacts C1 and C2. Next, the switch 57 is operated to bring the movable contacts 571 and 572 into contact with the-contact B1 and the + contact A2, respectively. Then, current flows from the PTC element 58 to the capacitor 66 through the relay coil 601 for a moment, the relay coil 601 is excited, and the relay 600 switches from the A contact to the B contact accordingly. As a result, the current from the battery 51 flows in the direction of the one-dot chain line arrow from the PTC element 58 to the motor 13 to the relay 600, so that the motor 13 rotates (reverses). On the other hand, a part of the current in the direction of the one-dot chain line described above flows from the relay coil 601 to the resistor 68, so that the contact state of the relay 600 with the B contact is self-maintained. The rotation force of the motor 13 causes the mirror assembly 7 to rotate, for example, from the storage position to the use position as described above. Then, when the mirror assembly 7 reaches the use position which is the predetermined stop position, the stopper is activated, that is, the ball 12 on the moving side hits the stepped portion 60 of the arcuate groove 6 on the fixed side, and the mirror assembly 7 moves. It is physically and forcibly stopped at the use position, which is the predetermined stop position. At this time, the motor 13 is overloaded and an overcurrent flows in the electric circuit. Due to this overcurrent, the internal temperature of the PTC element 58 rises, and when it reaches a certain temperature range, the internal resistance of the PTC element 58 rapidly increases, and the PTC element 58 performs a switching operation. Then, the relay coil 601 is de-energized, the relay 600 self-recovers and switches from the B contact to the A contact, and the energization to the motor 13 is cut off. As a result, the rotation (drive) of the motor 13 is stopped, and the mirror assembly 7 is completely stopped at the use position. Therefore, the operation of the switch 57 is stopped, and the movable contacts 571 and 572 are automatically returned to the middle contacts C1 and C2. In such an electric retractable door mirror, the backlash after the reduction mechanism 24 and the clutch gear 19 are stopped is contained by the gear packing action of the reduction mechanism 24 and the clutch gear 19 (electric gear), so that a mirror assembly is obtained. It prevents the rattling of 7. When the above-mentioned mirror assembly 7 is in the use position, an obstacle or the like hits the mirror assembly 7 with a force larger than the elastic force of the compression spring 17 (holding torque of the clutch mechanism), or when the mirror assembly 7 is put in or out of the garage. At this time, if the mirror assembly 7 is manually rotated by a force larger than the elastic force of the compression spring 17 (holding torque of the clutch mechanism), the locking groove of the clutch gear 19 of the clutch mechanism 15 and the clutch holder 20 are not locked. The engagement and engagement state with the engagement claw 200 is released, and the clutch mechanism 15 and the clutch gear 19 and the clutch holder 20 are disengaged. As a result, as shown in FIG. 8, the clutch gear 19 rotates with respect to the shaft 3, and accordingly, the mirror assembly 7 tilts forward from the use position by an angle φ or backward. Further, the mirror assembly 7 located at the forward tilting position or the rearward tilting position is manually rotated backward or forward to fit the locking groove 190 of the clutch gear 19 and the locking claw 200 of the clutch holder 20. By locking and reengaging the clutch gear 19 and the clutch holder 20, the mirror assembly 7 returns from the forward tilt position or the rear tilt position to the use position.

[0008]

[Problems to be solved by the device]

 In such an electric retractable door mirror, since the motor 13, the clutch mechanism 15 and the speed reduction mechanism 24 are housed in a narrow space, the space between the motor 13 (the motor mounting portion 143 of the plate 14) and the shaft screw 37 is small. Very narrow. For this reason, flat washers, spring washers, locking nuts, etc., which prevent the shaft screw 37 from rotating, cannot be used. Therefore, it is conceivable to apply a coating material (for example, product name Nyloc, etc.) to the screw portion 40 of the shaft screw 37, or fix it with an adhesive. On the other hand, the above-mentioned coating materials and adhesives have problems such as time and cost. For this purpose, like the conventional bolt rotation preventing mechanism described above, a part of the head pressing portion 42 of the plate 14 is caulked and engaged with the head portion 38 of the shaft screw 37, and the shaft screw 37 is rotated. It is to prevent rotation.

An object of the present invention is to provide a bolt rotation stop mechanism which is inexpensive.

[0010]

[Means for Solving the Problems]

 The present invention is characterized in that an engaging groove is provided in a component to be fastened by a bolt, and on the other hand, a head portion of the bolt is provided with an anti-rotation portion that engages with the engaging groove to prevent the bolt from turning. ..

[0011]

[Action]

 According to the present invention, after the components are fastened with the bolts according to the above-mentioned structure, the bolts are prevented from rotating by engaging the detent portion of the head of the bolt with the engaging groove of the component. In this way, since no coating material or adhesive is used, time and cost are saved. Moreover, since the engaging groove is provided on the component and the rotation preventing portion is provided on the head of the bolt, and the rotation preventing portion is engaged with the engagement groove to prevent the rotation, a flat washer or a spring washer or Locking nuts cannot be used, etc. Even in a narrow space, rotation can be prevented.

[0012]

【Example】

 An embodiment of a bolt rotation preventing mechanism according to the present invention will be described below with reference to FIGS. 1 to 5. In the figure, the same symbols as those in FIGS. 6 to 18 indicate the same things. In the figure, 141 is an engaging groove, and this engaging groove 144 is provided in the plate 14 that is fastened to the unit bracket 8 by a shaft screw 37 as a bolt. That is, the rectangular engaging grooves 144 are provided on both sides of the edge of the through hole 142 on the upper surface side of the plate 14 in parallel with the stepped portion with the motor mounting portion 143. In the figure, 370 is a shaft screw. The shaft screw 370 includes a circular head portion 371, a collar portion 372 as a rotation stopping portion integrally provided on the lower surface of the head portion 371, and a shaft portion 373 integrally protruded from the lower surface of the collar portion 372. And a screw portion 374 provided at the lower end of the shaft portion 373.

Since the bolt anti-rotation mechanism of the present invention in this embodiment has the above-mentioned structure, first, the plate 14 is attached to the unit bracket 8 by the axial screw 370. After that, an external force (crimping force) is applied to a part of the flange portion 372 of the shaft screw 370 with a tool (not shown) or the like to deform a part of the flange portion 372 of the shaft screw 370, and the plate is then deformed. The engaging groove 144 of 14 is engaged and engaged. As a result, the rotation of the shaft screw 370 is stopped. In this way, since no coating material or adhesive is used, no time or cost is required. Moreover, the bolt rotation preventing mechanism of the present invention is provided with the engaging groove 144 in the plate 14, the head portion 371 of the shaft screw 370 with the flange portion 372, and the flange portion 372 engaging with the engaging groove 144. Since it has a structure to prevent rotation, it can be stopped even in a narrow space where flat washers, spring washers, lock nuts, etc. cannot be used.

In this embodiment, the rotation stopping mechanism of the shaft screw 370 for attaching the plate 14 in the electric retractable door mirror of the automobile to the unit bracket 8 has been described. The mechanism can also be used as a bolt for fastening other components. Further, although the die cast plate 14 is used in this embodiment, the weight can be reduced by using a synthetic resin plate.

[0015]

[Effect of the device]

 As is clear from the above, the bolt anti-rotation mechanism of the present invention is provided with the engaging groove in the part to be tightened by the bolt, while the head of the bolt is engaged with the engaging groove to turn the bolt. Since the anti-rotation part for stopping is provided, if the anti-rotation part of the head of the bolt is engaged with the engaging groove of the part after the parts are fastened with the bolt, the anti-rotation of the bolt will be stopped. Will be applied. In this way, since no coating material or adhesive is used, no time or cost is required. Moreover, since the engaging groove is provided in the component and the rotation stop is provided on the head of the one-sided bolt, and the rotation stop is engaged with the engagement groove to prevent the rotation, the flat washer or the spring washer is used. Even in a narrow space where lock nuts and lock nuts cannot be used, rotation can be prevented.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a plate as a component and a shaft screw as a bolt, showing an embodiment of a bolt rotation preventing mechanism of the present invention.

FIG. 2 is a plan view of the plate and the shaft screw before engaging the flange portion with the engaging groove.

FIG. 3 is a sectional view of the plate and the shaft screw before engaging the flange portion with the engaging groove.

FIG. 4 is a plan view of the plate and the shaft screw after the flange portion is engaged with the engagement groove.

FIG. 5 is a sectional view of the plate and the shaft screw after the flange portion is also engaged with the engagement groove.

FIG. 6 is a plan view in which a part of an electric retractable door mirror equipped with a conventional bolt rotation stopping mechanism is cut away.

FIG. 7 is an exploded perspective view of a reduction mechanism, a motor, a plate, etc. of the electric retractable door mirror described above.

FIG. 8 is an exploded perspective view of the clutch mechanism, unit bracket, shaft holder, etc. of the electric retractable door mirror described above.

FIG. 9 is a perspective view of an assembled state of a motor and a reduction mechanism.

FIG. 10 is a sectional view of an assembled state of a motor, a reduction gear mechanism, and a clutch mechanism.

11 is a sectional view taken along line XI-XI in FIG.

12 is a sectional view taken along line XII-XII in FIG.

FIG. 13 is a plan view of the plate and the shaft screw in a state where the head pressing portion is engaged with the head of the shaft screw.

FIG. 14 is a cross-sectional view of the plate and the shaft screw before the head retainer is engaged with the head of the shaft screw.

FIG. 15 is a plan view of the plate and the shaft screw before the head retainer is engaged with the head of the shaft screw.

FIG. 16 is a plan view of the shaft holder.

17 is a sectional view taken along line XVII-XVII in FIG.

FIG. 18 is an electric circuit diagram of a switch circuit.

[Explanation of symbols]

8 ... Unit bracket (part), 14 ... Plate (part), 144 ... Engagement groove, 370 ... Shaft screw, 371 ... Head, 372 ... Collar part (rotation stop part).

Claims (1)

[Scope of utility model registration request] 1. A bolt anti-rotation mechanism for fastening a plurality of parts, comprising: an engaging groove formed in the part; and a head part of the bolt, the engaging groove being engaged with the engaging groove. An anti-rotation mechanism for bolts, which is provided with an anti-rotation portion that performs anti-rotation.