JP6001939B2 - Rotary actuator and electric retractable door mirror using the same - Google Patents

Description

  The present invention relates to a rotary actuator and an electric retractable door mirror using the same.

  There is known a rotary actuator that transmits the rotation of a motor to a shaft through a reduction gear. The rotary actuator disclosed in Patent Document 1 is used as a drive device for an electric retractable door mirror. The shaft is fixed to the vehicle body, the motor and the speed reducer are attached to the case, and the case is fixed to the housing. The case is covered with a cover for waterproofing and dustproofing the motor and the speed reducer.

JP 2005-319929 A

  In the rotary actuator disclosed in Patent Document 1, there is a problem that noise is generated due to sounds such as motor operating noise and gear reducer noise that leak out of the cover. In the case of the electric retractable door mirror, the sound leaking outside the cover is emitted to the outside through the gap between the housing and the mirror, so that the housing acts like a megaphone and the noise is further increased. In particular, when a vehicle such as an electric vehicle is running only with a running motor, the noise problem becomes significant.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a rotary actuator capable of suppressing noise and an electric retractable door mirror using the same.

The present invention is a rotary actuator used as a drive unit for storing a vehicle door mirror, and includes a cover in which a motor and a reducer housing chamber are defined between a case and a case . Cover is a bottomed cylindrical resin member is fixed to the case, you are forming irregularities on the inner wall.
In the first aspect of the present invention, the unevenness is composed of a plurality of holes integrally formed on the inner wall of the bottom portion of the cover and a plurality of ribs integrally formed on the inner wall of the cylinder portion of the cover. The hole is open toward the opening side of the cover. The rib extends from the bottom side of the cover toward the opening side.
In the 2nd aspect of this invention, the unevenness | corrugation is comprised from the some protrusion integrally formed in the inner wall of the bottom part of a cover, and the some rib integrally formed in the inner wall of the cylinder part of a cover. The protrusion protrudes toward the opening side of the cover. The rib extends from the bottom side of the cover toward the opening side.
The unevenness of the inner wall of the cover has a function of generating various reflected sounds having different phases and a function of irregularly reflecting the sound in the recess.

  Therefore, if the unevenness of the cover is set so as to generate more reflected sounds having a phase opposite to that of the motor operating sound and the reduction gear rattling sound, the operating sound is directed from the source to the cover. Attenuated by the reflected sound along the way. Further, the sound reaching the cover is diffusely reflected and further attenuated in the concave and convex portions of the cover. For this reason, the volume of the sound leaking outside the cover is reduced, so that noise can be suppressed.

1 is an exploded perspective view of an electric retractable door mirror to which a rotary actuator according to a first embodiment of the present invention is applied. It is a perspective view of the rotary actuator of FIG. It is a disassembled perspective view of the rotary actuator of FIG. It is sectional drawing which passes along the shaft center of the output shaft and shaft of the motor of the rotary actuator of FIG. It is the perspective view which looked at the case of the rotary actuator of FIG. 1 from upper direction. It is a top view of the case of FIG. It is the perspective view which looked at the cover of the rotary actuator of FIG. 1 from upper direction. It is the perspective view which looked at the cover of FIG. 7 from the downward direction. It is a side view of the cover of FIG. FIG. 10 is a bottom view of the cover as viewed from the direction of arrow X in FIG. 9. It is a XI-XI line cutting part end view of Drawing 10. It is an enlarged view of the arrow XII part of FIG. It is a bottom view of the cover of the rotary actuator by 2nd Embodiment of this invention. It is a bottom view of the cover of the rotary actuator by 3rd Embodiment of this invention. It is a bottom view of the cover of the rotary actuator by 4th Embodiment of this invention. FIG. 16 is an end view taken along line XVI-XVI in FIG. 15.

Hereinafter, a plurality of embodiments of the present invention will be described with reference to the drawings. In the embodiments, substantially the same components are denoted by the same reference numerals and description thereof is omitted.
(First embodiment)
The rotary actuator according to the first embodiment of the present invention is applied to the electric retractable door mirror shown in FIG. The electric retractable door mirror 1 includes a rotary actuator 10, a housing 2, a mirror 3, and a mirror surface adjustment actuator 4. In the rotary actuator 10, the shaft 30 is fixed to the body base 5 that forms a part of the vehicle body, and the case 40 can rotate relative to the shaft 30. The housing 2 is fixed to the case 40 and can rotate around the axis of the shaft 30 integrally with the case 40. The mirror surface adjustment actuator 4 is fixed to the housing 2 and can change the angle of the mirror 3 with respect to the housing 2.

First, the configuration of the rotary actuator 10 will be described with reference to FIGS.
The rotary actuator 10 includes a motor 20, a speed reducer 25, a shaft 30, a clutch 35, a case 40, a gear cover 45, and a cover 50.
The motor 20 is composed of, for example, a commutator motor, and includes a field (not shown) fixed to the inner wall of the sleeve 21 and an armature (not shown) that is rotatably provided inside the field. The output shaft 22 is a rotating shaft of the armature.

The speed reducer 25 is fitted to the output shaft 22 so as to be able to transmit rotation, to the first worm wheel 27 engaged with the first worm 26, and to be able to transmit rotation to the first worm wheel 27. The second worm 28 is engaged, and the second worm wheel 29 is engaged with the second worm 28. The second worm wheel 29 is a final reduction member of the reduction gear 25. The speed reducer 25 decelerates the rotation of the output shaft 22 and transmits it to the shaft 30 via a clutch ring 36 described later.
The shaft 30 extends in a vertical direction and is formed in a stepped shape so that the lower end portion 31 has a large diameter. The lower end 31 is fixed to the body base 5.

  The clutch 35 has a clutch ring 36 and a spring 38. The clutch ring 36 is an annular member that is positioned between the second worm wheel 29 and the bottom portion 42 of the case 40 and is fitted to the shaft 30 so as to be able to transmit rotation. The clutch ring 36 has a plurality of protrusions 37 protruding toward the second worm wheel 29 side. The projection 37 can be fitted into the groove 34 of the second worm wheel 29, and the clutch ring 36 can connect the second worm wheel 29 and the shaft 30 so as to transmit rotation when the projection 37 is fitted into the groove 34. To do. One end of the spring 38 is supported by the plate 39, and the other end biases the second worm wheel 29 against the clutch ring 36. The connection between the second worm wheel 29 and the shaft 30 by the clutch ring 36 is released when the case 40 is rotated relative to the shaft 30 so that the projection 37 comes out of the groove 34 against the biasing force of the spring 38. .

The case 40 includes a cylindrical portion 41 that surrounds the motor 20, the speed reducer 25, and the shaft 30, a bottom portion 42 that closes the lower end portion of the cylindrical portion 41, and an attachment portion 43 that is fixed to the cylindrical portion 41. The cylinder part 41 and the bottom part 42 are supporting the structural member of the reduction gear 25 rotatably. The bottom portion 42 has a through hole 44 through which the shaft 30 is inserted. The step surface 32 of the shaft 30 supports the bottom portion 42 of the case 40 so that the case 40 can rotate around the axis of the shaft 30 with respect to the shaft 30. The housing 2 is fixed to the attachment portion 43.
The gear cover 45 has a function of protecting the speed reducer 25, the clutch 35, and the like and mounting the motor 20 to the case 40.

  The cover 50 is a bottomed member that is fitted to the upper end portion of the cylindrical portion 41 of the case 40, and includes a first cover portion 51 and a second cover portion 52 that are integrally formed with each other. The first cover portion 51 is provided corresponding to the motor 20, and the second cover portion 52 is provided corresponding to the shaft 30 and the clutch 35. In other words, the cover 50 has a longitudinal shape in the linear direction connecting the motor 20 and the shaft 30, the first cover portion 51 is located on the motor 20 side, and the second cover portion 52 is located on the shaft 30 side. . The cover 50 defines a housing chamber for the motor 20, the speed reducer 25, the clutch 35, and the spring 38 between the case 40 and a waterproof means and a dustproof means for the motor 20, the speed reducer 25 and the clutch 35. It is functioning.

Here, the rotary actuator 10 according to the present embodiment is characterized in that the inner wall of the cover 50 forms the irregularities 53. Specifically, the inner wall of the cover 50 has a first hole 54, a second hole 55, a first rib 56 and a second rib 57.
The first holes 54 are formed in the inner wall at the bottom of the first cover portion 51 and the inner wall at the bottom of the second cover portion 52 so as to form a row in the short direction at predetermined intervals in the longitudinal direction of the cover 50. . The second holes 55 are formed on the inner wall at the bottom of the first cover portion 51 and the inner wall at the bottom of the second cover portion 52 so as to form a row in the short direction between the first holes 54 in the longitudinal direction of the cover 50. Has been. The first hole 54 and the second hole 55 have a bottomed shape in which the shape of the cross section perpendicular to the thickness direction of the bottom is circular and the bottom is in the thickness direction of the bottom. The inner diameter of the first hole 54 is larger than the inner diameter of the second hole 55.

  A plurality of first ribs 56 are formed so as to extend from the bottom side to the opening side of the cylindrical portion of the cover 50. The first ribs 56 are arranged at equal intervals in the circumferential direction on the inner wall of the cylindrical portion of the cover 50. The cylindrical portion of the cover 50 is configured in a serrated shape by the first rib 56. A plurality of second ribs 57 are formed at the corners of the tube portion and the bottom portion of the first cover portion 51. The first rib 56 and the second rib 57 function as a reinforcing means for the cover 50.

  The concave portion of the concave and convex portion 53 of the cover 50 includes a bottom portion of the first hole 54, a bottom portion of the second hole 55, and a skirt portion of the first rib 56. Further, the convex portion of the unevenness 53 of the cover 50 is constituted by an edge portion of the first hole 54, an edge portion of the second hole 55, a top portion of the first rib 56, and a top portion of the second rib 57. The unevenness 53 of the cover 50 configured as described above has a function of generating various reflected sounds having different phases and a function of irregularly reflecting sound in the recess. With respect to the reflected sound, the unevenness 53 is set so as to generate more reflected sound in the opposite phase to the operating sound of the motor 20 and the speed reducer 25 than the reflected sound in the same phase.

Next, the operation of the rotary actuator 10 will be described based on FIG. 1, FIG. 4, and FIG.
When there is a command to store the electric retractable door mirror 1, the motor 20 is rotationally driven by the control device. When the rotational force from the motor 20 is transmitted to the shaft 30 via the speed reducer 25 and the clutch ring 36, the reaction force from the shaft 30 is transmitted to the motor 20 via the clutch ring 36 and the speed reducer 25. In the case of the present embodiment, since the shaft 30 is fixed to the vehicle body, the motor 20 that receives the reaction force from the shaft 30 and the case 40 and the housing 2 fixed to the motor 20 rotate around the axis of the shaft 30. . As a result, the housing 2 is stored.

  When the motor 20 is driven to rotate, it generates an operating sound, and each gear of the speed reducer 25 generates a rattling sound, for example. Of these operating sounds, the sound traveling from the generation source to the cover 50 is reflected by the convex and concave surfaces of the unevenness 53 of the cover 50 and acts to attenuate the sound traveling toward the cover 50 with a delay. Further, the sound that has reached the concave portion of the cover 50 is attenuated by being irregularly reflected on the concave surface as shown by an phantom line arrow in FIG.

  As described above, in the rotary actuator 10 according to the first embodiment, the unevenness 53 formed by the inner wall of the cover 50 has a function of generating various reflected sounds having different phases and a function of irregularly reflecting sound in the recess. And have. The reflected sound includes more reflected sound having a phase opposite to that of the operation sound of the motor 20 or the like. Therefore, sounds such as the operating sound of the motor 20 and the rattling sound of the speed reducer 25 are attenuated by the reflected sound generated by the unevenness 53 of the cover 50 on the way from the generation source to the cover 50. Further, the sound that has reached the concave portion of the cover 50 is diffusely reflected by the concave surface and further attenuated. Therefore, the volume of the sound that leaks out of the cover 50 is reduced, so that noise can be suppressed.

  In the first embodiment, the unevenness 53 of the cover 50 is formed on both the first cover portion 51 and the second cover portion 52. Therefore, both the operating sound of the motor 20 and the rattling sound of the speed reducer 25 can be attenuated.

  In the first embodiment, the inner wall of the cover 50 has a first hole 54, a second hole 55, a first rib 56 and a second rib 57. Therefore, the concave portion of the unevenness 53 of the cover 50 can be constituted by the bottom portion of the first hole 54, the bottom portion of the second hole 55, and the skirt portion of the first rib 56. Further, the convex portion of the unevenness 53 of the cover 50 can be constituted by the edge of the first hole 54, the edge of the second hole 55, the top of the first rib 56, and the top of the second rib 57.

In the first embodiment, the cross-sectional shapes of the first hole 54 and the second hole 55 are circular. Therefore, the holes 54 and 55 can be easily formed.
Further, in the first embodiment, the cover 50 forms a first rib 56 and a second rib 57 as reinforcing means. Therefore, the strength of the cover 50 is increased by the ribs 56 and 57, and it is difficult to transmit sound to the outside. Therefore, as compared with the case without the first rib 56 and the second rib 57, the sound volume leaking out of the cover 50 is further reduced, and noise can be further suppressed.

  In the first embodiment, the first rib 56 and the second rib 57 are formed so as to extend from the bottom side to the opening side in the cylindrical portion of the cover 50. Therefore, the first rib 56 and the second rib 57 can be formed at the same time as the cover 50 is molded.

(Second Embodiment)
A rotary actuator according to a second embodiment of the present invention will be described with reference to FIG.
In the second embodiment, the inner wall of the first cover portion 62 of the cover 61 has a third hole 63, a first rib 56, and a second rib 57.
The third hole 63 has a hexagonal shape in a cross section perpendicular to the thickness direction of the bottom portion of the first cover portion 62, and has a bottom shape with a bottom in the thickness direction of the bottom portion. The inner wall of the bottom portion of the first cover portion 62 has a honeycomb structure due to the third holes 63.

The concave portion of the concave and convex portion 64 of the first cover portion 62 includes a bottom portion of the third hole 63 and a skirt portion of the first rib 56. Further, the convex portion of the concave and convex portion 64 of the first cover portion 62 is constituted by the edge portion of the third hole 63, the top portion of the first rib 56, and the top portion of the second rib 57. The unevenness 64 of the cover 61 configured as described above has a function of generating various reflected sounds having different phases and a function of irregularly reflecting sound in the recess.
According to the second embodiment, the same effects as those of the first embodiment can be obtained. Further, the rigidity can be enhanced while suppressing the weight increase of the cover 61 as much as possible, and the effect that noise can be further suppressed can be obtained.

(Third embodiment)
A rotary actuator according to a third embodiment of the present invention will be described with reference to FIG.
In the third embodiment, the inner wall of the first cover portion 67 of the cover 66 has a fourth hole 68, a first rib 56, and a second rib 57.
The fourth hole 68 has a bottomed shape in which the shape of the cross section perpendicular to the thickness direction of the bottom portion of the first cover portion 67 is a quadrangle and the bottom is in the thickness direction of the bottom portion. The inner wall of the bottom portion of the first cover portion 67 has a lattice frame structure by the fourth holes 68.

The concave portion of the unevenness 69 of the first cover portion 67 is composed of the bottom portion of the fourth hole 68 and the skirt portion of the first rib 56. In addition, the convex portion of the unevenness 69 of the first cover portion 67 includes an edge portion of the fourth hole 68, a top portion of the first rib 56, and a top portion of the second rib 57. The unevenness 69 of the cover 66 configured as described above has a function of generating various reflected sounds having different phases and a function of irregularly reflecting sound in the recess.
According to the third embodiment, the same effects as those of the first embodiment can be obtained, and further, it is possible to obtain the effect that the rigidity can be enhanced while suppressing the weight increase of the cover 61 and the noise can be further suppressed.

(Fourth embodiment)
A rotary actuator according to a fourth embodiment of the present invention will be described with reference to FIGS.
In the fourth embodiment, the inner wall of the bottom portion of the first cover portion 72 of the cover 71 forms a plurality of protrusions 73. The protrusion 73 is cylindrical.

The concave portion of the unevenness 74 of the cover 71 is composed of a skirt portion of the protrusion 73 and a skirt portion of the first rib 56. Further, the convex portion of the projections and depressions 74 of the cover 71 is composed of the tip end portion of the projection 73, the top portion of the first rib 56, and the top portion of the second rib 57. The unevenness 74 of the cover 71 configured as described above has a function of generating various reflected sounds having different phases and a function of irregularly reflecting sound in the recess.
According to 3rd Embodiment, there exists an effect similar to 1st Embodiment.

(Other embodiments )

  In other embodiments of the present invention, the holes in the inner wall of the cover may not be aligned and may be formed randomly. Further, the shape of the cross section of the hole is not limited to a circle, a quadrangle, and a hexagon, and may be, for example, an ellipse or another polygon. Further, the size and depth of each hole may be constant or different. The bottom surface of the hole may be a flat surface or a curved surface. In particular, when the depth of the hole is shallow and the bottom surface is spherical, the irregularities are dimple-shaped. In particular, when the hole entrance is narrower than the back, that is, in the shape of a bowl, a silencing function by Helmholtz resonance can be obtained, and the sound attenuation effect by diffuse reflection in the hole is further enhanced. The bowl-shaped hole can be obtained by forcibly removing a cover made of a relatively soft resin such as PP. Moreover, the hole should just be formed in the inner wall of the 1st cover part, ie, the motor periphery.

In another embodiment of the present invention, the first ribs may not be arranged at equal intervals in the circumferential direction on the cylindrical portion of the cover. Further, the size and length of each first rib may be constant or different.
In another embodiment of the present invention, the protrusion formed by the inner wall of the cover may be formed on the second cover part. Further, the protrusion is not limited to a columnar shape, and may have another shape such as a polygonal columnar shape.
In another embodiment of the present invention, the holes, ribs, and protrusions of the inner wall of the cover do not need to be formed at the same time as the cover is molded, and may be formed by processing after molding the cover.

In another embodiment of the present invention, the speed reducer is not limited to the worm and worm wheel, and may be realized by other mechanical configurations.
In other embodiments of the present invention, the clutch may not be provided.
In other embodiments of the present invention, the gear cover may not be provided.
In another embodiment of the present invention, the rotary actuator is used not only as a drive device for storing a door mirror, but also, for example, a drive device for adjusting the mirror angle of a door mirror, a drive device for adjusting the optical axis of a headlight, and an air conditioner damper. It can be used as a louver drive device, a wiper drive device, and the like. In short, it can be applied as a drive unit for various functional products having a driven member that can rotate.
The present invention is not limited to the embodiments described above, and can be implemented in various forms without departing from the spirit of the invention.

DESCRIPTION OF SYMBOLS 10 ... Rotary actuator 20 ... Motor 22 ... Output shaft 25 ... Reduction gear 29 ... 2nd worm wheel (final deceleration member)
30 ... shaft 40 ... case 44 ... through hole 50, 61, 66, 71 ... cover 53, 64, 69, 74 ... uneven

Claims (4)

A rotary actuator used as a drive unit for storing a vehicle door mirror,
A motor (20);
A speed reducer (25) connected to the output shaft (22) of the motor so as to transmit rotation;
A shaft (30) connected to the final speed reduction member (29) of the speed reducer so as to transmit rotation;
A case (40) having a through hole (44) through which the shaft is inserted and fixing the motor;
It is a bottomed cylindrical resin member, fixed to the case, and the compartment for the motor and the speed reducer is defined between the case and irregularities (53, 64, 69, 74) are formed on the inner wall. Covering covers (50, 61, 66, 71),
Equipped with a,
The unevenness is composed of a plurality of holes formed integrally on the inner wall of the bottom portion of the cover and a plurality of ribs formed integrally on the inner wall of the cylindrical portion of the cover,
The hole is open toward the opening side of the cover;
The rotary actuator (10) , wherein the rib extends from the bottom side of the cover toward the opening side . A rotary actuator used as a drive unit for storing a vehicle door mirror,
A motor (20);
A speed reducer (25) connected to the output shaft (22) of the motor so as to transmit rotation;
A shaft (30) connected to the final speed reduction member (29) of the speed reducer so as to transmit rotation;
A case (40) having a through hole (44) through which the shaft is inserted and fixing the motor;
It is a bottomed cylindrical resin member, fixed to the case, and the compartment for the motor and the speed reducer is defined between the case and irregularities (53, 64, 69, 74) are formed on the inner wall. Covering covers (50, 61, 66, 71),
Equipped with a,
The unevenness is composed of a plurality of protrusions integrally formed on the inner wall of the bottom portion of the cover and a plurality of ribs integrally formed on the inner wall of the cylindrical portion of the cover,
The protrusion protrudes toward the opening side of the cover,
The rotary actuator (10) , wherein the rib extends from the bottom side of the cover toward the opening side . 3. The rotary actuator according to claim 1, wherein the ribs are formed at equal intervals in the circumferential direction on the inner wall of the cylindrical portion of the cover. The rotary actuator according to any one of claims 1 to 3 ,
A housing fixed to the case;
A mirror attached to the housing;
An electrically retractable door mirror comprising:

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