JP4294424B2 - Rotation driving force transmission structure and motor device - Google Patents

Description

  The present invention relates to a rotational drive force transmission structure and a motor device that transmit rotational drive force via a rubber damper (rubber body).

  2. Description of the Related Art Conventionally, a motor device for a power window device or the like includes a motor body that rotationally drives a rotating shaft, and a speed reducing portion that includes a worm gear that reduces the rotation of the rotating shaft. As such a motor device, an output side rotating body is provided so as to be rotatable about the same center as the worm wheel, an input side support surface provided on the worm wheel, and an output side support provided on the output side rotating body. Some have rubber bodies (rubber dampers) interposed between them and the circumferential direction. As such a motor device, an accommodation recess is formed on one side of the worm wheel, an input-side projection having an input-side support surface is erected from the bottom of the accommodation recess, and an output is provided in the accommodation recess. There is one that accommodates (at least partly) an output-side convex portion having a side support surface and a rubber body (rubber damper) (see, for example, Patent Document 1). In such a motor device, the axial size of the worm wheel can be prevented from increasing while the axial thickness of the outer edge (tooth portion) of the worm wheel is secured. In such a motor device, the rubber body (rubber damper) is restricted from moving outward in the radial direction at the outer peripheral wall surface that is the peripheral wall surface of the housing recess of the worm wheel. An output shaft is connected to the output side rotating body, and the output shaft is connected to the vehicle window via a regulator or the like.

In such a motor device, the rotational force of the input side support surface based on the rotation of the worm wheel is transmitted to the output side support surface via the rubber body, and the output side rotation body is rotated. Further, in such a motor device (rotational driving force transmission structure), for example, when the output side rotating body is subjected to a sudden load during rotation of the worm wheel, the impact between the worm wheel and the output side rotating body is rubber. It is suppressed by elastic deformation of the body (rubber damper).
Japanese Patent Laid-Open No. 10-318297

By the way, in the motor device as described above, when viewed from the axial direction of the worm wheel, the corner portion of the rubber body (rubber damper) has an R shape (convex curved surface) or is chamfered.
However, in the shape as described above, the rubber body regulates the radial movement of the rubber body when the output side rotating body is subjected to a sudden load when the worm wheel rotates and the rubber body is compressed. There is a possibility of being caught between the outer peripheral wall surface (or inner peripheral wall surface) and the output side convex portion provided with the output side support surface or the input side convex portion provided with the input side support surface. That is, as schematically shown in FIG. 5, for example, when viewed from the axial direction of the worm wheel 50, the radially outer end (outer corner 52) at the circumferential end of the rubber body 51 has an R shape (convex shape). 6, when the rubber body 51 is compressed, the outer corner portion 52 is caught between the outer peripheral wall surface 53 and the output-side convex portion 55 provided with the output-side support surface 54 as shown in FIG. There is a fear. 5 and 6, the input-side convex portion 57 having the input-side support surface 56 is formed continuously with the outer peripheral wall surface 53 (so that there is no gap). When the body 51 is compressed, the outer corner portion 52 may be caught between the outer peripheral wall surface 53 and the input side convex portion. This causes the rubber body 51 to be worn or damaged, and as a result, the cushion characteristics of the rubber body 51 change.

  Therefore, it is conceivable to prevent the biting by increasing the radius of the R shape or increasing the chamfered portion. In this case, the rubber body is in contact with the output side support surface and the input side support surface. There is a problem that the area becomes significantly small and desired cushion characteristics cannot be obtained.

  In the case where the rubber body is subjected to surface treatment (halogenation treatment) and its friction coefficient is reduced to prevent the biting while ensuring the contact area, the surface treatment reduces the manufacturing cost. It will increase.

  The present invention has been made to solve the above-described problems, and the object thereof is to provide a rubber body without significantly reducing the contact area between the rubber body and the output side support surface or the input side support surface. An object of the present invention is to provide a rotational driving force transmission structure and a motor device that can reduce the biting of a rubber body during compression.

In the first aspect of the present invention, an output side rotator is provided so as to be rotatable about a coaxial center with respect to the rotationally driven input side rotator, the input side support surface provided on the input side rotator, and A rubber body is interposed in a circumferential direction with the output side support surface provided on the output side rotary body, and the rotational force of the input side support surface based on the rotation of the input side rotary body is passed through the rubber body. A structure for transmitting a rotational driving force that is transmitted to the output-side support surface and rotates the output-side rotator, wherein an output-side convex portion is erected on the output-side rotator, and a periphery of the output-side convex portion A surface substantially orthogonal to the direction is the output-side support surface, the input-side rotator has a disk portion and an outer peripheral wall erected from the outer peripheral edge thereof, and the output-side convex portion has an outer peripheral side surface thereof It is set to have a gap with the inner peripheral surface of the outer peripheral wall of the input side rotating body, and the circumferential direction of the rubber body A concave curved surface is formed at the radially outer end of the portion when viewed from the axial direction, and viewed from the axial direction by the curved surface, the output side support surface, and the inner peripheral surface of the outer peripheral wall of the input side rotating body. A substantially quadrant-shaped gap is formed, and the rubber body has a diameter of the curved surface so that the curved surface becomes substantially linear when compressed between the input-side support surface and the output-side support surface. Is set .

In the invention described in 請 Motomeko 2, to the transmission structure of the rotational driving force according to claim 1, a motor device including a motor main body for rotating the input side rotating body and spirit.

(Function)
According to the first aspect of the present invention, for example, when a sudden load is applied to the output side rotating body during rotation of the input side rotating body, the impact between the input side rotating body and the output side rotating body is applied to the rubber body. Can be suppressed. Moreover, a concave curved surface is formed at the radially outer end of the circumferential end of the rubber body as viewed from the axial direction. Therefore, without significantly reducing the contact area between the rubber body and the output side support surface or the input side support surface, when the rubber body is compressed, the rubber body, the inner peripheral surface of the outer peripheral wall of the input side rotating body , to be caught between the clearance between the outer peripheral side surface of the output-side convex portion having an output support surface can be reduced compared to the prior art.

Further, the rubber body, as the amount of compression is increased radially outward, and the inner peripheral surface of the radially outer end portion outer peripheral wall, but easily bitten between gap between the outer peripheral side surface of the output-side protrusion, Since the concave curved surface as viewed from the axial direction is formed at the radially outer end of the rubber body, the biting is prevented.

According to the invention described in claim 2 , the effect of the invention described in claim 1 can be obtained in the motor device.

According to the first aspect of the present invention, it is possible to reduce the biting of the rubber body when the rubber body is compressed without significantly reducing the contact area between the rubber body and the output side support surface or the input side support surface. It is possible to provide a structure for transmitting a rotational driving force capable of

According to the invention described in claim 2 , the rubber body is bitten when the rubber body is compressed without significantly reducing the contact area between the rubber body and the output side support surface or the input side support surface. It is possible to provide a motor device having a rotational driving force transmission structure capable of reducing the above.

Hereinafter, an embodiment in which the present invention is embodied in a motor device for a power window device will be described with reference to FIGS.
As shown in FIG. 1, the motor device 1 includes a motor main body 10 and a speed reduction unit 11. The motor main body 10 includes a rotating shaft (not shown) and rotationally drives the rotating shaft. The speed reduction unit 11 includes a housing 12, a worm wheel 13 as an input side rotating body, a rubber damper 14, an output plate 15 as an output side rotating body, an output shaft 16, a lid 17, and the like.

  The housing 12 is made of a synthetic resin and includes a motor fixing portion 12a, a worm accommodating portion 12b, and a wheel accommodating portion 12c. The motor fixing portion 12a is fixed to the motor main body 10 (yoke), and the worm accommodating portion 12b formed on the shaft center of the motor main body 10 has a worm (not shown) that rotates integrally with the rotating shaft of the motor main body 10. Is housed. A part of the worm is exposed in the wheel accommodating portion 12c.

  The wheel accommodating portion 12c is formed in a substantially bottomed cylindrical shape, and a cylindrical shaft support portion 18 is erected at the center of the upper surface of the bottom plate portion. A shaft hole 18 a extending in the axial direction is formed in the shaft support portion 18. And the worm wheel 13 is accommodated in the wheel accommodating part 12c.

  The worm wheel 13 is made of a synthetic resin and has a substantially bottomed cylindrical shape. More specifically, the worm wheel 13 has an outer peripheral wall 21 erected from the outer peripheral edge of the disk portion 20, and a tooth portion H to be engaged with the worm is formed on the outer peripheral surface of the outer peripheral wall 21. A cylindrical inner peripheral wall 22 is erected in the center of the disk portion 20 in the same direction as the outer peripheral wall 21. In the disk portion 20, an input-side convex portion 23 is erected between the outer peripheral wall 21 and the inner peripheral wall 22 in the same direction as the outer peripheral wall 21. Three input-side convex portions 23 of the present embodiment are formed at equiangular intervals. Further, as shown in FIG. 3, the input-side convex portion 23 is formed continuously with the outer peripheral wall 21 (so as not to have a gap) and formed with a gap with the inner peripheral wall 22. And the side surface (surface substantially orthogonal to the circumferential direction of the worm wheel 13) of this input side convex part 23 is made into the input side support surface 23a. Further, the upper surface of the disk portion 20 (the surface on the side where the outer peripheral wall 21 is erected), the outer peripheral wall surface 21a that is the inner peripheral surface of the outer peripheral wall 21, the inner peripheral wall surface 22a that is the outer peripheral surface of the inner peripheral wall 22, and the input A portion surrounded by the side support surface 23 a constitutes the damper accommodating portion 24. The worm wheel 13 is supported by the inner peripheral wall 22 with the shaft support portion 18 fitted therein and accommodated in the wheel accommodating portion 12c. At this time, the tooth portion H of the worm wheel 13 is engaged with the worm (not shown) exposed in the wheel housing portion 12c.

  As shown in FIG. 2, the rubber damper 14 has a shape obtained by dividing the annular plate member in the circumferential direction, that is, a plurality of substantially fan-shaped (six (three sets) in this embodiment) damper portions 25 as rubber bodies, Each damper portion 25 is provided with a connecting portion 26 that connects the damper portions 25 in an annular shape at the radially inner end thereof.

  The diameter of a circle E1 (see FIG. 2) passing through the outermost side of the rubber damper 14, that is, the outer peripheral side surface (radially outer side surface) of the damper portion 25 in this embodiment is substantially the same as the diameter of the outer peripheral wall surface 21a (see FIG. 3). It is the same, and the said outer peripheral side surface is set so that it may inscribe substantially the outer peripheral wall surface 21a. Further, the diameter of a circle E2 (see FIG. 2) passing through the innermost side of the rubber damper 14, that is, in this embodiment, the inner circumferential side surface (radial inner side surface) of the connecting portion 26 is the inner circumferential wall surface 22a (see FIG. 3). ) And is set so that the inner peripheral wall surface substantially circumscribes the inner peripheral wall surface 22a. Further, the inner peripheral side surface 25a of the damper portion 25 in the present embodiment is formed so as to be recessed outward from the circle E2, and is set so as not to contact the inner peripheral wall surface 22a.

  A concave curved surface 25c is formed at the outer corner 25b, which is a radially outer end at the circumferential end of the damper 25, when viewed from the axial direction (of the rubber damper 14). The curved surface 25c of the present embodiment is formed in an arc shape.

  As shown in FIG. 3, the rubber damper 14 is accommodated in the damper accommodating portion 24 so that the two adjacent damper portions 25 are accommodated in the respective chambers partitioned by the input-side convex portion 23. . At this time, the side surface of the damper portion 25 (a surface substantially orthogonal to the circumferential direction of the rubber damper 14) is brought into contact with the input side support surface 23 a of each input side convex portion 23. At this time, the gap 27 formed by the outer corner portion 25b (curved surface 25c), the input side support surface 23a, and the outer peripheral wall surface 21a has a substantially quadrant shape when viewed from the axial direction (of the worm wheel 13). Become.

  The output plate 15 is made of metal and is formed in a substantially disc shape as shown in FIG. 1, and a shaft fitting portion 28 is formed at the center thereof. Further, an output-side convex portion 29 (see FIG. 3) is erected on the lower surface of the output plate 15 (the surface facing the worm wheel 13). Three output side convex portions 29 of the present embodiment are formed at equal angular intervals (only two are shown in FIG. 1). Further, the diameter of the circle passing through the outer peripheral side surface (radially outer side surface) of the output side convex portion 29 is smaller than the diameter of the outer peripheral wall surface 21a, and the outer peripheral side surface of the output side convex portion 29 is the outer peripheral wall surface as shown in FIG. 21 a and a gap 30 are set. 3 and 4 schematically show the gap 30 in an exaggerated manner. Further, the diameter of the circle passing through the inner peripheral side surface (radial inner side surface) of the output-side convex portion 29 is substantially the same as the diameter of the circle passing through the outer peripheral side surface (radial outer side surface) of the connecting portion 26, and FIG. As shown, the inner peripheral side surface of the output-side convex portion 29 is set so as to circumscribe the outer peripheral side surface of the connecting portion 26. And the side surface (surface substantially orthogonal to the circumferential direction of the output plate 15) of this output side convex part 29 is made into the output side support surface 29a.

  Then, the output plate 15 is fitted so that the output-side convex portion 29 is interposed between the two adjacent damper portions 25 as shown in FIG. At this time, the output side support surface 29a of each output side convex portion 29 comes into contact with the side surface of the damper portion 25 (a surface substantially orthogonal to the circumferential direction of the rubber damper 14). At this time, the gap 27 formed by the outer corner portion 25b (curved surface 25c), the output side support surface 29a, and the outer peripheral wall surface 21a has a substantially quadrant shape when viewed from the axial direction (of the worm wheel 13). Become. Moreover, the said damper part 25 is interposed by the said structure between the circumferential directions of the input side support surface 23a and the output side support surface 29a.

  As shown in FIG. 1, the output shaft 16 has a fitting portion 32 that can be fitted to the shaft fitting portion 28 at one end of the shaft portion 31, and a gear portion 33 at the other end of the shaft portion 31. Is formed. The output shaft 16 is inserted into the shaft hole 18a from the fitting portion 32 side, the fitting portion 32 is fitted into the shaft fitting portion 28, and is formed on the distal end side of the fitting portion 32. The fixing ring 34 is fixed to the engaging groove 32a to prevent the engagement ring 32a from coming off, and the shaft supporting portion 18 is rotatably supported. The output shaft 16 is engaged with a gear portion of a regulator (not shown) and the gear portion 33 is connected to a vehicle window (side glass) via the regulator.

The lid 17 is fixed to the housing 12 so as to cover the opening of the wheel accommodating portion 12c.
Next, the operation of the motor device (power window device) configured as described above will be described.

  When power is supplied to the motor device based on the operation of a power window switch provided on a vehicle (not shown), the worm is driven to rotate together with the rotating shaft of the motor body 10, and the worm wheel 13 is rotated based on the rotation of the worm. To do. Then, the rotational force of the input side support surface 23 a based on the rotation of the worm wheel 13 is transmitted to the output side support surface 29 a via the damper portion 25, and the output shaft 16 rotates together with the output plate 15. Then, the vehicle window is raised and lowered via a regulator or the like.

  For example, when the vehicle window hits the window frame and the movement is restricted when the vehicle window is raised, the rotation of the output shaft 16 and the output plate 15 is restricted. At this time, the compressive force that one of the two adjacent damper portions 25 receives from the input-side support surface 23a and the output-side support surface 29a suddenly increases. At the time of compression, as shown in FIG. 4, the outer corner portion 25b of the damper portion 25 bulges (elastically deforms) so as to reduce the gap 27, but a concave curved surface 25c is formed on the outer corner portion 25b. Since the distance from the intermediate portion of the curved surface 25c to the gap 30 is long, the outer corner portion 25b is less likely to be caught between the outer peripheral wall surface 21a and the output-side convex portion 29 (the outer peripheral side surface). In the present embodiment, at the time of compression as described above, the curved surface 25c is substantially linear, and the substantially quadrant (see FIG. 3) gap 27 is substantially triangular (see FIG. 4). The diameter of the curved surface 25c is set. In FIG. 4, the curved surface 25 c that is substantially linear is also denoted by the same reference numeral. FIG. 4 shows a state when the movement is restricted when the vehicle window is raised, and when the movement is restricted when the vehicle window is lowered, the other damper of the two adjacent damper portions 25 is shown. The compressive force received by the portion 25 is increased, and the damper portion 25 is similarly elastically deformed. As described above, even when a sudden load is applied to the output plate 15 and the output shaft 16, the damper portion 25 is elastically deformed, so that the impact between the worm wheel 13 and the output plate 15, and consequently, between the worm wheel 13 and the worm. The shock applied to (the meshing portion) and the like is suppressed by the damper portion 25.

Next, characteristic effects of the above embodiment will be described below.
(1) A concave curved surface 25c (see FIGS. 2 and 3) is formed on the outer corner portion 25b of the damper portion 25 when viewed from the axial direction. Therefore, the outer corner portion 25b of the damper portion 25 is connected to the outer peripheral wall surface 21a when the damper portion 25 is compressed without significantly reducing the contact area between the damper portion 25 and the input side support surface 23a and the output side support surface 29a. Biting between the output side convex portion 29 (the outer peripheral side surface thereof) can be reduced as compared with the structure of the prior art (curved surface shape with convex outer corners). Thereby, while ensuring the said contact area of the damper part 25, ie, ensuring a desired cushion characteristic, the abrasion and damage can be reduced and durability can be improved. Further, it is possible to omit the surface treatment (halogenation treatment) applied to the damper portion 25 (rubber damper 14) in order to reduce the friction coefficient, and thus the manufacturing cost can be reduced.

  (2) The compression amount of the damper portion 25 increases toward the outer side in the radial direction, and the outer end portion in the radial direction is likely to be caught between the outer peripheral wall surface 21a and the output side support surface 29a. Since the concave curved surface 25c is formed at the radially outer end portion (outer corner portion 25b) of the damper portion 25, biting that easily occurs is prevented.

  (3) Since the input side support surface 23a, the output side support surface 29a, and the damper portion 25 are provided in a plurality (set) in the circumferential direction, the worm can be used when a sudden load is applied to the output plate 15 and the output shaft 16. The impact between the wheel 13 and the output plate 15 can be suppressed in the circumferential direction by a plurality of damper portions 25 with a good balance. Moreover, since the damper portion 25 is annularly connected by the connecting portion 26 at the radially inner end portion thereof, the curved surface 25c is formed at the radially outer end portion (outer corner portion 25b) of the above embodiment. While obtaining the effect (2), a plurality of damper portions 25 can be used as one member (rubber damper 14). Therefore, the number of parts is reduced, and as a result, assembly costs and the like can be reduced.

The above embodiment may be modified as follows.
In the above-described embodiment, the damper portion 25 is connected to the connecting portion 26 in a ring shape at the radially inner end thereof. However, each damper portion 25 is not connected to the independent member (approximately the damper portion 25). Six rubber dampers having the same shape may be used.

In this case, the input convex portion 23 may be formed continuously with the inner peripheral wall 22 (so that there is no gap).
In this case, the inner peripheral side surface (radial inner side surface) of the output-side convex portion 29 may be set so as to be close to the inner peripheral wall surface 22a (with a slight gap). Further, in this case, a concave curved surface as viewed from the axial direction may be formed at the radially inner end portion (inner corner portion) at the circumferential end portion of each independent damper portion. If it does in this way, when compressing a damper part, it can reduce that the inner corner part of a damper part is caught between inner peripheral wall surface 22a and an output side convex part (the inner peripheral side).

  In the above embodiment, the input side support surface 23a, the output side support surface 29a, and the damper portion 25 are provided in a plurality (three sets) in the circumferential direction. The number may be changed as appropriate. It should be noted that in the case of being driven to rotate in only one direction, a set is not necessary. Therefore, it is good also as an input side support surface, an output side support surface, and a damper part one each.

In the above embodiment, the curved surface 25c has an arc shape, but may be changed to another curved surface (for example, a shape of a part of an ellipse) as long as it is concave when viewed from the axial direction.
In the above embodiment, the motor device for the power window device is embodied, but the motor device for other devices may be embodied. In addition to the motor device, it is only necessary to have a structure for transmitting the rotational driving force that transmits the rotational force of the input-side rotating body that is rotationally driven through the rubber body (damper part) to rotate the output-side rotating body. It may be embodied in other devices.

The technical idea that can be grasped from the above embodiments will be described below together with the effects thereof.
(A) In the rotational driving force transmission structure according to claim 1 , a plurality of the input side support surface, the output side support surface, and the rubber body are provided in a circumferential direction, and the rubber body is in a radial direction thereof. A structure for transmitting a rotational driving force, wherein the inner end portion is connected in a ring shape at a connecting portion. In this way, when a sudden load is applied to the output side rotator during rotation of the input side rotator, the impact between the input side rotator and the output side rotator is balanced in the circumferential direction by the plurality of rubber bodies. Can be suppressed. Moreover, while obtaining the effect of claim 1, plurality is rubber body may be a single member (rubber damper), the number of parts is reduced, thereby reducing the thus assembled cost.

  (B) The circumference of the input side support surface provided on the input side rotator to be rotationally driven and the output side support surface provided on the output side rotator provided to be rotatable about the same axis as the input side rotator. A rubber body interposed between directions to transmit the rotational force of the input side support surface based on the rotation of the input side rotation body to the output side support surface to rotate the output side rotation body A rubber damper, characterized in that a concave curved surface is formed at a radial end portion in a circumferential end portion of the rubber body as viewed from the axial direction. When such a rubber damper is used, for example, when a sudden load is applied to the output side rotator during rotation of the input side rotator, the impact between the input side rotator and the output side rotator is suppressed by the rubber body. . Moreover, a concave curved surface is formed at the radial end portion in the circumferential end portion of the rubber body as viewed from the axial direction. Therefore, without significantly reducing the contact area between the rubber body and the output-side support surface or the input-side support surface, when the rubber body is compressed, the rubber body regulates the radial movement of the rubber body or It is possible to reduce the biting between the inner peripheral wall surface and the convex portion provided with the output side support surface or the input side support surface as compared with the prior art.

The principal part disassembled perspective view of the motor apparatus in this Embodiment. The top view of the rubber damper in this Embodiment. Explanatory drawing for demonstrating the transmission structure of the rotational drive force in this Embodiment. Explanatory drawing for demonstrating the transmission structure of the rotational drive force in this Embodiment. Explanatory drawing for demonstrating the transmission structure of the rotational drive force in a prior art. Explanatory drawing for demonstrating the transmission structure of the rotational drive force in a prior art.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Motor main body, 13 ... Worm wheel (input side rotary body), 15 ... Output plate (output side rotary body), 23a ... Input side support surface, 25 ... Damper part (rubber body), 25b ... Outer corner (rubber) (Radial direction (outer side) end portion at the circumferential end portion of the body), 25c... Curved surface, 29a.

Claims (2)

An output-side rotator is provided to be rotatable about the same axis as the rotationally driven input-side rotator, an input-side support surface provided on the input-side rotator, and an output provided on the output-side rotator A rubber body is interposed between the side support surface and the circumferential direction, and the rotational force of the input side support surface based on the rotation of the input side rotation body is transmitted to the output side support surface via the rubber body. A rotational driving force transmission structure for rotating the output-side rotator,
The output-side rotator is provided with an output-side convex portion, a surface substantially orthogonal to the circumferential direction of the output-side convex portion is used as the output-side support surface, and the input-side rotator is a disk portion and its outer periphery. And the output-side convex portion is set so that the outer peripheral side surface has a gap with the inner peripheral surface of the outer peripheral wall of the input-side rotating body,
A concave curved surface is formed on the radially outer end of the rubber body in the circumferential direction when viewed from the axial direction, and the curved surface, the output-side support surface, and the inner peripheral surface of the outer peripheral wall of the input-side rotator And a substantially quadrant-shaped gap is formed when viewed from the axial direction ,
The rotational drive of the rubber body, wherein the diameter of the curved surface is set so that the curved surface becomes substantially linear when compressed between the input side support surface and the output side support surface Power transmission structure. A motor apparatus comprising: the rotational driving force transmission structure according to claim 1; and a motor body that rotationally drives the input-side rotating body.

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