JP2005160161A - Rotation transmitter, manufacturing method for component of rotation transmitter, and motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotation transmitter wherein a sensor magnet is installed on a rotating part and, if cracking occurs in the sensor magnet, broken pieces can be prevented from flying without increase in the number of parts. <P>SOLUTION: A clutch 20 comprises: a drive-side rotator 35 that is coupled with a rotating shaft 6 as driving shaft so that it is integrally rotatable; and a driven-side body 29 of rotation that is integrally formed on a worm shaft 23 as driven shaft and is coupled with the drive-side rotator 35 and is driven thereby. The clutch 20 is provided with a sensor magnet 45. To detect the state of rotation of the rotating shaft 6, the sensor magnet is installed on the drive-side rotator 35 corresponding to the subject of detection so that it is integrally rotatable. The drive-side rotator 35 is made of resin molding, and the sensor magnet 45 is buried in the rotator 35 by insert molding so as to prevent flying of broken pieces from cracking in the magnet 45. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a rotation transmission device that drives and connects two shafts of a drive shaft and a driven shaft, a manufacturing method of components of the rotation transmission device, and a motor including the rotation transmission device.

  As a motor used in a power window device mounted on a vehicle, for example, there is a motor as shown in Patent Document 1. This motor is configured by integrally assembling a motor main body that rotates a rotating shaft and a speed reducing portion that houses a speed reducing mechanism including a worm shaft and a worm wheel that are drivingly connected to the rotating shaft via a clutch. The clutch is configured to transmit the rotational force from the rotational shaft as it is to the worm shaft, while locking the rotation of the worm shaft without transmitting the rotational force from the worm shaft to the rotational shaft. In other words, the clutch transmits the rotational force of the rotating shaft driven by the motor body to the worm shaft to open and close the window glass, while the motor is driven by an external force (such as the weight of the window glass or vibration) that lowers the window glass. When a rotational force acts on the output shaft, the worm shaft is locked to prevent the window glass from descending.

The clutch includes a driving side rotating body connected to the rotating shaft and a driven side rotating body provided integrally with the worm shaft, and a ring-shaped sensor magnet is mounted on the driving side rotating body. . A Hall element is disposed in the vicinity of the sensor magnet. The Hall element detects a change in the magnetic field of the sensor magnet that rotates together with the rotating shaft (drive-side rotating body), and detects the rotational speed and rotational speed of the rotating shaft. A detection signal for detecting rotation information such as the above is output.
JP 2003-18794 A

By the way, the above-described sensor magnet may be cracked, and in some cases, fragments may be scattered, which may hinder the rotation of the motor.
In view of this, it is considered to fix a cover that covers the entire sensor magnet to the drive side rotating body, and to prevent debris from scattering when the sensor magnet is cracked by the cover. However, problems such as an increase in the number of parts and an increase in the number of steps for fixing the cover occur due to the use of the cover.

  The present invention has been made in view of such circumstances, and its purpose is a rotation transmission device equipped with a sensor magnet in a rotating part, and the scattering of fragments when the sensor magnet is cracked is disclosed. An object of the present invention is to provide a rotation transmission device that can be prevented without increasing the number of components, a method for manufacturing the components of the rotation transmission device, and a motor including the rotation transmission device.

  In order to solve the above-mentioned problems, the invention according to claim 1 is a drive-side rotator that is provided so as to be integrally rotatable with the drive shaft, and a drive-side rotator that is provided so as to be integrally rotatable with the driven shaft. Rotation provided with a sensor magnet that is provided so as to be integrally rotatable with the rotating body corresponding to the detection target so as to detect the rotational state of at least one of the drive shaft and the driven shaft. In the transmission device, the rotating body corresponding to the detection target is made of a resin molded product, and at least a part of the magnet is embedded in the rotating body by insert molding in order to prevent scattering of fragments due to cracking of the sensor magnet. This is the gist.

The gist of the invention according to claim 2 is that in the rotation transmission device according to claim 1, the sensor magnet is entirely embedded in the rotating body.
According to a third aspect of the present invention, in the rotation transmission device according to the first or second aspect, the drive shaft has a connecting portion that is engaged with the drive-side rotator in the rotation direction, and the drive side The gist of the present invention is that the rotating body has a connecting hole that is connected to the connecting portion of the drive shaft in a loosely fitted state so as to be integrally rotatable.

  According to a fourth aspect of the present invention, in the rotation transmission device according to the third aspect, the drive-side rotator is configured such that the drive-side rotator is detached from the connection portion of the drive shaft in the vicinity of the connection hole. In order to prevent this, the gist is that an elastic holding portion for holding the rotating body by an elastic force with respect to the drive shaft is integrally formed.

  According to a fifth aspect of the present invention, in the rotation transmission device according to the fourth aspect, the sensor magnet is embedded in the drive-side rotator side, and the drive-side rotator passes through the sensor magnet at the time of molding. The gist of the invention is that the through hole is closed by a covering portion made of the same material as the elastic holding portion.

  Invention of Claim 6 is a manufacturing method of the component of the rotation transmission apparatus of Claim 5, Comprising: The coating | coated part which obstruct | occludes the said through-hole formed at the time of the shaping | molding of the said drive side rotary body, The gist is that the elastic holding portion is formed at the same time.

  According to a seventh aspect of the present invention, there is provided a motor main body that rotationally drives a rotary shaft, and a worm that is assembled with the motor main body and that constitutes a part of a speed reduction mechanism that is drivingly connected to the rotary shaft and decelerates the rotation of the rotary shaft. A speed reducer provided with a shaft, a driving side rotating body provided so as to be rotatable integrally with the rotating shaft, and a driven side rotating body provided so as to be rotatable integrally with the worm shaft and connected to the driving side rotating body. A rotation transmission device including a sensor magnet that is mounted on the rotating body corresponding to the detection target so as to be integrally rotatable so as to detect a rotation state of at least one of the rotating shaft and the worm shaft. The rotating body corresponding to the detection target is made of a resin molded product, and at least the magnet is prevented from being scattered in the rotating body due to cracks in the sensor magnet. Parts and spirit thereof that were buried by insert molding.

The invention according to claim 8 is the motor according to claim 7, wherein the sensor magnet is entirely embedded in the rotating body.
According to a ninth aspect of the present invention, in the motor according to the seventh or eighth aspect, the rotating shaft has a connecting portion that is engaged with the driving side rotator in the rotation direction, and the driving side rotator. The gist of the invention is that it has a connecting hole that is connected to the connecting portion of the rotating shaft so as to be freely fitted and integrally rotatable.

  According to a tenth aspect of the present invention, in the motor according to the ninth aspect, the driving side rotating body prevents the driving side rotating body from falling off from the connecting portion of the rotating shaft in the vicinity of the connecting hole. Therefore, the gist of the invention is that an elastic holding portion for holding the rotating body by an elastic force with respect to the rotating shaft is integrally formed.

  According to an eleventh aspect of the present invention, in the motor according to the tenth aspect, the sensor magnet is embedded in the drive side rotator, and the drive side rotator is formed with a through-hole penetrating to the sensor magnet when formed. The gist of the invention is that the through hole is closed by a covering portion made of the same material as the elastic holding portion.

(Function)
According to the first and seventh aspects of the present invention, the rotation transmission device is provided so as to be rotatable integrally with the drive shaft (rotary shaft) so as to be integrally rotated with the drive shaft (worm shaft). A rotating body corresponding to a detection target for detecting a rotation state of at least one of a driving shaft (rotating shaft) and a driven shaft (worm shaft). It has a sensor magnet that can be rotated together. The rotating body corresponding to the object to be detected is made of a resin molded product, and at least a part of the magnet is embedded in the rotating body by insert molding in order to prevent debris from scattering due to cracks in the sensor magnet. That is, scattering of debris due to cracks in the sensor magnet is prevented by embedding in the rotating body, so the number of parts does not increase.

  According to the second and eighth aspects of the present invention, the entire sensor magnet is embedded in the rotating body. In other words, since the sensor magnet is completely embedded in the rotating body so as not to be exposed to the outside, it is possible to reliably prevent debris from being scattered due to cracks in the sensor magnet, and to prevent the magnet from being exposed to the general portion. It is possible to omit the anti-corrosion coating performed in

  According to invention of Claim 3, 9, a drive shaft (rotating shaft) has a connection part latched in a rotation direction with a drive side rotary body, The connection part was provided in the drive side rotary body. It is connected to the connecting hole in a loosely fitted state and integrally rotatable. Therefore, even if an axial deviation occurs between the drive shaft (rotating shaft) and the drive-side rotating body, the mutual connection is in a loose-fitting state, so that the axial deviation is allowed. Accordingly, it is possible to prevent an excessive load from being generated at the connecting portion between the driving side rotating body and the driving shaft (rotating shaft) at the time of rotation, and generation of a large noise or vibration from the connecting portion is suppressed.

  According to the fourth and tenth aspects of the present invention, the drive-side rotator is provided on the drive-side rotator so as to prevent the drive-side rotator from dropping off from the connecting portion of the drive shaft (rotary shaft) in the vicinity of the connection hole. An elastic holding portion that holds the rotating body by an elastic force with respect to the rotating shaft) is integrally formed. That is, the drive shaft (rotary shaft) and the drive-side rotator are loosely connected to each other, so that when the drive-side rotator is attached to the drive shaft (rotary shaft), the rotator is rotated. Although there is a concern about dropping off from the shaft), the rotating body is held with respect to the drive shaft (rotating shaft) by the elastic force of the elastic holding portion, so that the dropping can be prevented. Therefore, the assembly of the rotation transmission device part is facilitated.

  According to the fifth and eleventh aspects of the present invention, the drive-side rotator is formed with a through-hole penetrating to the sensor magnet at the time of molding, and the through-hole is closed by the covering portion made of the same material as the elastic holding portion. The Therefore, the increase in the number of materials is prevented, and the elastic holding portion and the covering portion can be easily formed simultaneously.

  According to the sixth aspect of the present invention, the covering portion and the elastic holding portion for closing the through hole formed at the time of forming the driving side rotating body are simultaneously formed. Therefore, the time for forming the driving side rotating body can be shortened.

  According to the present invention, there is provided a rotation transmission device equipped with a sensor magnet in a rotating portion, and the rotation that can prevent scattering of fragments when the sensor magnet is cracked without increasing the number of parts. A transmission device, a method of manufacturing a component of the rotation transmission device, and a motor including the rotation transmission device can be provided.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of the invention will be described with reference to the drawings.
FIG. 1 shows a cross-sectional view of a main part of a motor 1 of this embodiment used as a drive source for a power window device. The motor 1 includes a motor body 2, a speed reduction unit 3, and a clutch 20 as a rotation transmission device.

  As shown in FIG. 1, the motor body 2 includes a yoke housing (hereinafter simply referred to as a yoke) 4, a pair of magnets 5, a rotating shaft 6 as a drive shaft, an armature (armature) 7, and a commutator (commutator) 8. The brush holder 9 and the brush 10 are provided.

  The yoke 4 is formed in a substantially bottomed flat cylindrical shape, and a pair of magnets 5 are fixed to the inner peripheral surface of the yoke 4 so as to face each other. An armature 7 is rotatably accommodated inside the magnet 5. The armature 7 has a rotating shaft 6, and a base end portion of the rotating shaft 6 is rotatably supported by a bearing 11 provided at the bottom center of the yoke 4. On the other hand, a commutator 8 is fixed to a predetermined portion on the distal end side of the rotating shaft 6. Further, as shown in FIGS. 2 and 3, a connecting portion 6 a having a cross-sectional two-surface width shape that is chamfered in parallel from a cylindrical shape is formed at the tip portion of the rotating shaft 6.

  On the opening side of the yoke 4, a flange portion 4 a is formed extending outward in the longitudinal direction of the cross section in the direction perpendicular to the axis of the yoke 4. A brush holder 9 is fitted into the opening of the yoke 4. The brush holder 9 includes a holder main body 9 a that substantially covers the opening of the yoke 4, and a connector portion 9 b that is integrally provided from the holder main body 9 a and protrudes radially outward of the yoke 4. The holder main body 9a holds a pair of brushes 10 that are connected to the connector portion 9b by wires (not shown) and that are in sliding contact with the commutator 8. A bearing 12 is provided at the center of the holder body 9a, and the bearing 12 rotatably supports a portion of the rotating shaft 6 between the commutator 8 and the connecting portion 6a.

  Driving power is supplied to the connector portion 9b from the outside. The drive power is supplied from the connector portion 9b to the coil winding wound around the armature 7 via the brush 10 and the commutator 8, and the armature 7 (rotary shaft 6) rotates based on the supply of the drive power, that is, the motor. The main body 2 is driven to rotate.

The speed reduction unit 3 includes a gear housing 21, bearings 22a and 22b, a worm shaft 23 as a driven shaft, a worm wheel 24, and an output shaft 25.
The gear housing 21 is made of resin, and is formed in a flat shape in which an upper end portion to which the motor main body 2 (yoke 4) is fixed corresponds to an opening of the yoke 4. As shown in FIGS. 1 and 3, a fixing portion 21 a for abutting the flange portion 4 a of the yoke 4 and fixing the yoke 4 is formed at the upper end portion of the gear housing 21. The fixing portion 21a has screw insertion holes 21b formed at predetermined three locations, and communicates with nuts (not shown) attached to the gear housing 21. The fixing portion 21a is formed with a fitting recess 21c into which the holder body 9a of the brush holder 9 is fitted. The gear housing 21 is combined with the yoke 4 in a state in which the holder main body 9a is fitted in the fitting recess 21c, and is inserted into a screw insertion hole (not shown) and a screw insertion hole 21b provided in the flange portion 4a of the yoke 4. One screw 13 (only one is shown in FIG. 1) is inserted and screwed to the nut, and the yoke 4 is fixed to the fixing portion 21a.

  As shown in FIGS. 1 to 3, the gear housing 21 has a flat concave portion 21d formed at the center of the fitting concave portion 21c, and a clutch housing concave portion 21e having a circular cross section at the center of the concave portion 21d. A worm shaft housing portion 21f that is formed and extends along the axial direction of the rotary shaft 6 is formed at the center of the clutch housing recess 21e. The gear housing 21 is formed with a wheel housing portion 21g that communicates with the worm shaft housing portion 21f in the direction perpendicular to the axis of the intermediate portion of the worm shaft housing portion 21f (rightward in FIG. 1).

  An annular flange fitting recess 21h is formed in the opening of the clutch receiving recess 21e, and engagement recesses 21i extending in the longitudinal direction are formed at both longitudinal ends of the recessed portion 21d in the flange fitting recess 21h. It is formed continuously. Two pedestals 21j are erected on the bottom of the recessed portion 21d. Each pedestal 21j is formed around the engaging recess 21i. That is, the base 21j is formed in a substantially U shape so as to have a wall surface continuous with the wall surface of the engagement recess 21i. Cylindrical engagement protrusions 21k are formed at both ends in the short direction of the recessed portion 21d on the upper surface of each pedestal 21j.

  In addition, a bearing holding portion 21l is formed on the bottom of the clutch housing recess 21e so as to be able to bend in the direction perpendicular to the axis. The bearing holding portion 21l is formed in a substantially cylindrical shape having a larger inner diameter than the worm shaft housing portion 21f and a smaller outer diameter than the inner diameter of the clutch housing recess 21e. The bearing holding portion 21l is formed extending in the axial direction to the vicinity of the approximate center of the clutch housing recess 21e. Further, a plurality of ribs 21m connected to the inner peripheral surface of the clutch housing recess 21e are formed on the outer peripheral surface of the base end of the bearing holding portion 21l.

  The bearings 22a and 22b are metal and substantially cylindrical slide bearings (metal bearings). The bearing 22a is fitted in the bearing holding portion 21l, and the bearing 22b is located on the bottom side of the worm shaft housing portion 21f (in FIG. 1). , Lower side).

  The worm shaft 23 is made of a metal material, and includes a worm shaft main body 28 and a driven side rotating body 29 integrally formed at the end of the worm shaft main body 28 on the motor main body 2 side (see FIG. 3). The worm shaft main body 28 is formed with a worm 28a at an intermediate portion thereof, and is rotatably supported by bearings 22a and 22b at both ends thereof and accommodated in the worm shaft accommodating portion 21f.

  The worm wheel 24 meshes with the worm 28a and is accommodated in the wheel accommodating portion 21g so as to be rotatable about the direction orthogonal to the worm shaft 23 as an axis center. The output shaft 25 is coupled to the worm wheel 24 so as to rotate coaxially with the rotation of the worm wheel 24. The output shaft 25 is drivably coupled to a known window regulator (not shown) for opening and closing (raising and lowering) the window glass.

  The rotary shaft 6 is connected to a worm shaft 23 via a clutch 20. As shown in FIGS. 2 and 3, the clutch 20 includes a driven side rotating body 29, a collar 31, a plurality (three) of rolling bodies 32, a support member 33, a stopper 34, a driving side rotating body 35, and a ball 36. It has components.

  The collar 31 has a cylindrical outer ring 31a, an annular flange 31b extending radially outward from one end (the upper end in FIGS. 2 and 3) of the outer ring 31a, and a diameter of 180 degrees from the flange 31b. It consists of a pair of engaging part 31c extended in the direction outer side. The collar 31 has an outer ring 31a fitted in the clutch housing recess 21e and a flange portion 31b fitted in the flange fitting recess 21h. The collar 31 is prevented from rotating by fitting the engaging portion 31c into the engaging recess 21i. The outer ring 31a of the collar 31 has the other end (the lower end in FIG. 2) fitted into the vicinity of the tip (the upper end in FIG. 2) position of the bearing holding portion 21l, and does not hinder the bending of the bearing holding portion 21l. . The driven rotating body 29 is disposed inside the outer ring 31a.

  As shown in FIG. 3, the driven-side rotator 29 has a shaft portion 29a extending coaxially from the proximal end portion of the worm shaft main body 28 to the motor main body 2 side (rotating shaft 6 side), and from the shaft portion 29a. And three engaging convex portions 29b extending radially outward at an angle (120 °) interval. A contact member 30 is mounted on the end surface of the shaft portion 29a at a portion where a ball 36, which will be described later, contacts. The contact member 30 is made of a metal material having a hardness higher than that of the other portion of the worm shaft 23 (quenched) so as to make point contact with the ball 36, and the contact portion 30 is in contact with the ball 36. It is provided to prevent excessive wear.

  The engaging convex part 29b is formed so that the width in the circumferential direction increases toward the outer side in the radial direction. Further, as shown in FIG. 4, which is a cross-sectional view taken along the line AA of FIG. 2, the radially outer surface of the engaging convex portion 29b is arranged such that the distance from the inner peripheral surface 31d of the outer ring 31a of the collar 31 is the rotational end portion side. A planar control surface 41 is formed so as to be shorter. As shown in FIG. 2, the driven-side rotator 29 is provided with reinforcing ribs 29c for the engaging projections 29b. The reinforcing rib 29c is formed so as to connect the circumferential end surfaces of the engaging convex portions 29b adjacent in the circumferential direction at the end portion of the engaging convex portion 29b on the worm shaft main body 28 side.

  Each rolling element 32 is formed of a resin material in a substantially cylindrical shape, and is disposed between the control surface 41 of the engaging projection 29b and the inner peripheral surface 31d of the collar 31 as shown in FIG. The diameter of the rolling element 32 is smaller than the distance between the central portion (rotational direction central portion) 41a of the control surface 41 and the inner peripheral surface 31d of the collar 31, and the side portions (rotational direction end portions) 41b and 41c of the control surface 41 and the collar. It is set larger than the interval between the inner peripheral surfaces 31d of 31. That is, the diameter of the rolling element 32 is set to be equal to the interval between the intermediate portion 41 d between the central portion 41 a and the side portions 41 b and 41 c and the inner peripheral surface 31 d of the collar 31.

  The support member 33 holds the rolling elements 32 so as to be rotatable and substantially parallel at equal angular intervals. More specifically, the support member 33 is made of a resin material, and as shown in FIGS. 2 and 3, a ring portion 33a, three inwardly extending portions 33b, three pairs of roller supports 33c, and three connecting portions 33d. It consists of. The ring portion 33a is formed in an annular shape having a diameter larger than that of the outer ring 31a. The three inward extending portions 33b are extended from the inner periphery of the ring portion 33a radially inward at equal angular intervals. Each roller support 33c extends in the axial direction from both circumferential ends on the radially inner side of the inwardly extending portion 33b. Each connecting portion 33d is formed in an arc shape so as to connect adjacent roller supports 33c. Further, a pair of locking projections 33e facing the circumferential direction are formed at the tip of each roller support 33c (see FIG. 2). And each rolling element 32 is hold | maintained between each pair of roller support 33c, and between the inner extension part 33b and the latching convex part 33e, and it cannot move to the circumferential direction and an axial direction with respect to the ring part 33a. Retained. As described above, the support member 33 holding the rolling elements 32 is configured such that each roller support 33c is arranged on the outer ring 31a so that the rolling elements 32 are disposed between the control surface 41 and the inner peripheral surface 31d of the collar 31 as described above. The ring portion 33 a is disposed in contact with the flange portion 31 b on the outer side in the axial direction of the collar 31.

  The stopper 34 is made of a metal plate, and has a contact portion 34a formed in an annular shape having the same diameter as the ring portion 33a of the support member 33. The stopper 34 is radially outward from the contact portion 34a at an interval of 180 °. And an extending portion 34b that extends. The inner and outer diameters of the contact portion 34a are set to be substantially the same as the inner and outer diameters of the outer ring 31a of the collar 31. A fixing portion 34c is formed in the extending portion 34b. The fixing portions 34 c are formed at the four corners of the stopper 34 so as to correspond to the engaging protrusions 21 k of the gear housing 21. The stopper 34 is fixed to the gear housing 21 by engaging the engaging protrusion 21k with the fixing portion 34c. The contact portion 34 a of the stopper 34 is disposed on the upper portion of the ring portion 33 a of the support member 33. The stopper 34 regulates the axial movement of the rolling element 32 together with the support member 33 by the ring portion 33a of the support member 33 coming into contact with the contact portion 34a. In addition, a restricting portion 34d is formed substantially at the center of each extending portion 34b. The restricting portion 34d is formed by cutting up a part of the extended portion 34b. The restricting portion 34 d is in contact with the engaging portion 31 c of the collar 31 to restrict the movement of the collar 31 in the axial direction.

  As shown in FIGS. 2, 3, and 7, the drive-side rotator 35 has a substantially cylindrical main body portion 35a and one end (the upper end in FIG. 2) of the main body portion 35a that opens and extends along the axial direction. A plurality of connecting holes 35b formed at the center of the other end (lower end in FIG. 2) of the main body 35a, and a plurality of (3 And a projecting portion 42 to be formed (see FIG. 4).

  The connecting hole 35b is formed in a cross-sectional two-surface width shape having a pair of parallel surfaces so as to correspond to the connecting portion 6a of the rotating shaft 6. The connecting portion 6a of the rotating shaft 6 is loosely fitted in the connecting hole 35b. That is, the connecting hole 35b is set so that the dimension thereof is relatively larger than the connecting portion 6a of the rotating shaft 6 by a predetermined value, and a gap S is generated between them. The driving hole 35b and the connecting portion 6a of the rotating shaft 6 are loosely fitted, and the driving side rotating body 35 and the rotating shaft 6 are drivingly connected so as to be integrally rotatable.

  By the way, the connecting hole 35b and the connecting portion 6a of the rotating shaft 6 are loosely fitted, so that the shaft misalignment with the rotating shaft 6 during assembly (the rotating shaft with respect to the central axis of the drive side rotating body 35) 6 is allowed to be inclined, or the center axis of the rotary shaft 6 is displaced in the radial direction in a state parallel to the central axis of the drive side rotary body 35). It is possible to prevent a large radial load from being generated in the connecting portion with the shaft 6. Further, even if, for example, the worm shaft 23 is bent and the drive side rotator 35 is tilted and the shaft is displaced with respect to the rotating shaft 6 during rotation, a large radial load is similarly prevented from being generated at the connecting portion. The As a result, no large noise or vibration is generated from the connecting portion during rotation.

  The ball receiving recess 35c is provided so as to communicate with the connection hole 35b, and holds the ball 36 rotatably. The ball 36 is held in a state where a part of the ball 36 protrudes in both axial directions, and is in contact with the end surface of the rotating shaft 6 and the end surface of the worm shaft 23 (contact member 30). The ball 36 is made of a metal material that has been hardened to increase the hardness, like the contact member 30.

  Here, in the driving side rotating body 35, first, a resin body constituting substantially the entire rotating body 35 is formed by insert molding so that a metal plate 37 and a sensor magnet 45 described later are embedded in a predetermined position. The elastic holding portion 38 and the buffer portion 43 made of an elastic material such as an elastomer resin, which will be described later, are integrally formed with the resin body.

  The metal plate 37 is embedded near the other end (near the worm shaft 23) of the main body portion 35a of the drive-side rotator 35, and has an annular base portion 37a constituting a central portion, and each projecting portion 42 from the base portion 37a. And three arm portions 37b (only one is shown in FIG. 2) extending radially. The metal plate 37 engages with the drive side rotator 35, particularly the driven side rotator 29, and engages with the rigidity of each projecting portion 42 that transmits the driving force and with the connecting portion 6 a of the rotating shaft 6 to generate the driving force. The rigidity of the connecting hole 35b portion for transmission is improved.

  In the center of the base portion 37a of the metal plate 37, a connection hole 37c having the same cross-section as the connection hole 35b is formed and exposed in the connection hole 35b. The inner peripheral surface of the connection hole 37c is flush with the inner peripheral surface of the connection hole 35b. The drive side rotator 35 is formed by pouring a resin material into a mold (not shown). In this case, the metal plate 37 is positioned in the mold in advance before the resin is poured into the mold. For this positioning, a connecting hole 37c provided in the plate 37 is used.

  And in the connection hole 35b which the connection hole 37c of this metal plate 37 exposes, it engages with the connection part 6a of the said rotating shaft 6 in a rotation direction. In this case, although the connecting hole 35b is short in the axial direction, the rigidity is improved by the metal plate 37, so that the rotational driving force from the rotating shaft 6 is reliably received while suppressing the enlargement in the axial direction. Yes. In addition, since the connecting hole 35b is shortened in the axial direction, the inclination angle of the rotating shaft 6 with respect to the driving side rotating body 35 can be widened. Therefore, even when the inclination of the rotating shaft 6 is large, it can be easily handled.

  In addition, an elastic holding portion 38 made of an elastic material such as an elastomer resin is integrally formed on the driving side rotating body 35 so as to be continuous from the opening portion of the coupling hole 35b. The elastic holding portion 38 is formed so as to protrude slightly inward from the connection hole 35b (see FIG. 7), and is in pressure contact with the connection portion 6a of the rotating shaft 6. Therefore, when the driving side rotating body 35 is mounted on the rotating shaft 6 when the motor 1 is assembled, the driving side rotating body 35 is held by the elastic force so that the driving side rotating body 35 does not fall off the rotating shaft 6. Workability is improved.

  The three projecting portions 42 provided on the outer peripheral edge of the other end of the main body portion 35a are formed to project in a substantially fan shape in the axial direction. As shown in FIG. 4, each projecting portion 42 is formed along the inner peripheral surface 31 d with an outer peripheral surface having a slightly smaller diameter than the inner peripheral surface 31 d of the collar 31. In other words, the drive-side rotator 35 is formed such that the protruding portion 42 can be inserted in the axial direction from the center hole of the abutting portion 34 a of the stopper 34. The projecting portions 42 are arranged between the respective engaging convex portions 29b of the driven side rotating body 29 and between the respective rolling elements 32 (each roller support 33c) in the outer ring 31a.

  The protruding portion 42 is formed with a fitting groove 42 a extending in the radial direction from the radially inner side to the middle of the protruding portion 42. A buffer part 43 made of the same elastic material as that of the elastic holding part 38 is integrally formed in the fitting groove 42a. The buffer portion 43 is molded simultaneously with the elastic holding portion 38 with respect to the resin portion of the driving side rotating body 35. The buffer portion 43 is formed with a buffer portion 43a that protrudes inward in the radial direction of the protruding portion 42 from the fitting groove 42a and extends in the circumferential direction. The circumferential width of the buffer portion 43 a is set to be slightly larger than the circumferential width of the inner circumferential surface of the projecting portion 42.

  One side surface (counterclockwise surface) 43b of the buffering portion 43a is engaged when the driving-side rotator 35 rotates to the predetermined position in the counterclockwise direction (arrow X direction) with respect to the driven-side rotator 29. It abuts on the first abutting surface 29d, which is the clockwise surface of the portion 29b. Further, one side surface (counterclockwise surface) 42b formed on the radially inner side of the projecting portion 42 is when the driving side rotating body 35 further rotates counterclockwise (arrow X direction) from the predetermined position. The one side surface 43b of the buffer portion 43a is crushed and contacts the first contact surface 29d of the engagement convex portion 29b (see FIG. 5).

  Further, the other side surface (clockwise side surface) 43c of the buffer portion 43a is engaged with the projecting protrusion when the driving side rotating body 35 rotates to the predetermined position in the clockwise direction (arrow Y direction) with respect to the driven side rotating body 29. It abuts on the second abutment surface 29e which is the counterclockwise surface of the portion 29b. Further, the other side surface (clockwise side surface) 42c formed on the radially inner side of the projecting portion 42 is buffered when the driving side rotating body 35 further rotates in the clockwise direction (arrow Y direction) from the predetermined position. The other side surface 43c of the part 43a is crushed and comes into contact with the second contact surface 29e of the engagement convex portion 29b.

  As shown in FIG. 5, each member 32, 42, 29b, 33c has one side surface 42b of the projecting portion 42 in contact with the first contact surface 29d of the engaging convex portion 29b. A state in which the first pressing surface 42d formed on the radially outer side of the counterclockwise surface is in contact with the roller support 33c (see FIG. 5), and the other side surface 42c of the projecting portion 42 is the engaging convex portion 29b. The rolling element 32 is in contact with the second support surface 29e and the second pressing surface 42e formed on the radially outer side of the clockwise surface of the projecting portion 42 is in contact with the roller support 33c. Are arranged at positions corresponding to the central portion 41a of the control surface 41, and the shapes and dimensions of the members 32, 42, 29b, and 33c are set.

  Further, the drive-side rotator 35 is completely covered with a sensor magnet 45 having a ring shape with a quadrangular cross section and being multipolarly magnetized in the rotation direction near one end of the main body 35a (closer to the motor main body 2). So that it is buried. The sensor magnet 45 is arranged so that the center axis thereof coincides with the center axis of the drive-side rotator 35 (connection hole 35b). Incidentally, when the drive side rotating body 35 is formed, a plurality of through holes 35d and 35e are provided on the rotating body 35 by magnet support pins (not shown) for supporting the sensor magnet 45 in the forming die. Each part 35a is formed at a predetermined location along the axial direction from each end. Therefore, the through holes 35d and 35e are provided continuously with the elastic holding portion 38 and the buffer portion 43 so that the sensor magnet 45 is completely embedded in the drive-side rotator 35 so that the sensor magnet 45 is not exposed. , 43d, respectively. That is, the covering portions 38 a and 43 d are simultaneously formed of the same material as the elastic holding portion 38 and the buffer portion 43. Thus, by embedding the sensor magnet 45 in the drive-side rotator 35, even if the magnet 45 is cracked, it is possible to prevent fragments from being scattered. Further, since the sensor magnet 45 is completely embedded in the drive side rotating body 35, not only is the scattering of the fragments reliably prevented, but also the corrosion prevention coating generally performed on the exposed portion of the magnet 45 is applied. Can be omitted. Furthermore, since no special parts for preventing scattering are used, the number of parts does not increase, and the number of assembling man-hours does not increase.

  In contrast to such a sensor magnet 45, the brush holder 9 is provided with a magnetic detection element 46 such as a Hall element or a magnetoresistive element at a position located in the vicinity of the sensor magnet 45. The magnetic detection element 46 is provided to detect a change in the magnetic field accompanying the rotation of the sensor magnet 45 and to detect a rotation state such as the rotation speed and rotation speed of the rotary shaft 6 that rotates integrally with the drive side rotating body 35. ing.

  When the motor body 2 is driven and the rotary shaft 6 rotates, for example, in the counterclockwise direction (arrow X direction) in FIG. The projecting portion 42) integrally rotates in the same direction (arrow X direction). As shown in FIG. 5, when the one side surface 42b of the projecting portion 42 contacts the first contact surface 29d of the engagement convex portion 29b and the first pressing surface 42d contacts the roller support 33c, the rolling element 32 is disposed at a position corresponding to the central portion 41a of the control surface 41 (hereinafter referred to as a neutral position). In this case, before the one side surface 42b of the projecting portion 42 contacts the first contact surface 29d, the one side surface 43b of the buffer portion 43a contacts the first contact surface 29d of the engaging convex portion 29b first. As a result, the impact at the time of contact is kept small.

  In this neutral state, the rolling element 32 is not sandwiched between the control surface 41 of the engaging convex portion 29 b and the inner peripheral surface 31 d of the collar 31, so that the driven side rotating body 29 can rotate with respect to the collar 31. Therefore, when the driving side rotating body 35 further rotates counterclockwise, the rotational force is transmitted from the projecting portion 42 to the driven side rotating body 29, and the driven side rotating body 29 is rotated. At this time, the rotational force in the same direction (arrow X direction) is transmitted from the first pressing surface 42d to the roller support 33c (support member 33), and the roller support 33c (support member 33) moves together with the rolling elements 32 in the same direction. Moving.

  On the contrary, when the rotating shaft 6 rotates in the clockwise direction (arrow Y direction) in FIG. 4, although not shown, the rolling element 32 is disposed at the neutral position by the protruding portion 42 as described above. Even in this state, since the rolling element 32 is not sandwiched between the control surface 41 of the engaging convex portion 29 b and the inner peripheral surface 31 d of the collar 31, the driven side rotating body 29 can rotate with respect to the collar 31. Accordingly, the rotational force of the driving side rotating body 35 is transmitted from the projecting portion 42 to the driven side rotating body 29, and the driven side rotating body 29 is rotated.

  That is, the clutch 20 transmits the rotation of the driving side rotating body 35 by driving the motor body 2 to the driven side rotating body 29 to rotate the worm shaft 23, and the worm wheel 24 and the output shaft 25 are rotated based on the rotation. . Then, a window regulator that is drivingly connected to the output shaft 25 is operated, and the window glass is opened and closed (lifted).

  On the other hand, when a load is applied to rotate the output shaft 25 from the load side (wind glass side) while the motor 1 is stopped, the driven side rotating body 29 (worm shaft 23) is rotated by the load. try to. When the driven-side rotator 29 is rotated in the clockwise direction in FIG. 4 (arrow Y direction), the rolling element 32 relatively moves toward the side 41b of the control surface 41 of the engaging convex portion 29b. Eventually, when the driven rotary body 29 rotates in the same direction until the rolling element 32 reaches the intermediate portion 41d on the side portion 41b side, as shown in FIG. It is clamped by the surface 31d (becomes locked). Since the outer ring 31a is fixed, the driven-side rotator 29 is further prevented from rotating in the same direction, and the drive-side rotator 35 is not rotated.

  On the contrary, when the driven-side rotating body 29 is rotated in the counterclockwise direction (arrow X direction) in FIG. 4 by the load, the rolling element 32 is controlled by the control surface of the engaging convex portion 29b, although not shown. 41 moves to the side 41c side. Eventually, when the driven rotating body 29 rotates in the same direction until the rolling element 32 reaches the intermediate portion 41d on the side portion 41c side, the rolling element 32 is sandwiched between the control surface 41 and the inner peripheral surface 31d of the collar 31 ( Locked). Since the outer ring 31a is fixed, the driven-side rotator 29 is further prevented from rotating in the same direction, and the drive-side rotator 35 is not rotated.

  That is, when a load is generated that causes the output shaft 25 to rotate from the load side (wind glass side), the clutch 20 locks the driven-side rotator 29 and prevents the output shaft 25 from rotating. Therefore, the window glass is prevented from moving unexpectedly due to its own weight, vibration, external force, or the like. Thus, the motor 1 of this embodiment operates.

Next, characteristic effects of the present embodiment will be described.
(1) The clutch 20 is integrally formed with a driving side rotating body 35 that is connected to a rotating shaft 6 that is a driving shaft so as to be integrally rotatable, and a worm shaft 23 that is a driven shaft, and is drivingly connected to the driving side rotating body 35. And a driven magnet 29, and a sensor magnet 45 mounted on the driving rotor 35 corresponding to the detection target so as to be integrally rotatable so as to detect the rotational state of the rotating shaft 6. The drive-side rotator 35 is made of a resin molded product, and the magnet 45 is embedded in the rotator 35 by insert molding so as to prevent debris from being scattered due to cracks in the sensor magnet 45. That is, since the scattering of the fragments due to the cracking of the sensor magnet 45 is prevented by being embedded in the drive side rotating body 35, an increase in the number of parts can be prevented.

  (2) The entire sensor magnet 45 is embedded in the drive side rotating body 35. That is, since the sensor magnet 45 is completely embedded in the drive-side rotator 35 so as not to be exposed to the outside, not only the debris is prevented from being scattered due to the crack of the sensor magnet 45 but also the exposure of the magnet 45 is prevented. It is possible to omit the anticorrosion coating that is generally performed on the part.

  (3) The rotating shaft 6 has a connecting portion 6a that engages with the driving side rotating body 35 in the rotation direction, and the connecting portion 6a is loosely fitted in a connecting hole 35b provided in the driving side rotating body 35. And are connected so as to be integrally rotatable. For this reason, even if an axial deviation occurs between the rotating shaft 6 and the drive-side rotating body 35, the mutual connection is in a loose-fitting state, so that the axial deviation is allowed. Therefore, it is possible to prevent an excessive load from being generated at the connecting portion between the driving side rotator 35 and the rotating shaft 6 during rotation, and it is possible to suppress the occurrence of large abnormal noise and vibration from the connecting portion.

  (4) The drive-side rotator 35 is elastically applied to the rotary shaft 6 to prevent the drive-side rotator 35 from dropping from the connecting portion 6a of the rotary shaft 6 in the vicinity of the connecting hole 35b. An elastic holding portion 38 for holding 35 is integrally formed. That is, since the rotary shaft 6 and the driving side rotating body 35 are loosely connected to each other, the rotating body 35 is dropped from the rotating shaft 6 when the driving side rotating body 35 is attached to the rotating shaft 6. However, since the rotating body 35 is held with respect to the rotating shaft 6 by the elastic force of the elastic holding portion 38, it can be prevented from falling off. Therefore, the assembly of the clutch 20 portion can be facilitated.

  (5) The drive-side rotator 35 is formed with through holes 35d and 35e penetrating to the sensor magnet 45 at the time of molding, and the through holes 35d and 35e are covered portions 38a made of the same material as the elastic holding portion 38 and the buffer portion 43. , 43d. Therefore, an increase in the number of materials can be prevented, and the elastic holding portion 38 and the buffer portion 43 and the covering portions 38a and 43d can be easily formed simultaneously. If the elastic holding portion 38 and the buffer portion 43 and the covering portions 38a and 43d are formed at the same time, the time for forming the drive side rotating body 35 can be shortened.

In addition, you may change embodiment of this invention as follows.
In the above embodiment, one sensor magnet 45 having a ring shape with a quadrangular cross section is embedded in the drive side rotating body 35, but the shape of the magnet is not limited to this, and a plurality of sensor magnets are embedded. Also good.

  In the above embodiment, the drive-side rotating body 35 is a resin molded product, and a sensor magnet 45 is embedded in the rotating body 35 to detect the rotation state of the rotating shaft 6 that rotates integrally with the rotating body 35. It is not limited to. For example, the driven-side rotator 29 may be a resin molded product, and a sensor magnet 45 may be embedded in the rotator 29 to detect the rotation state of the worm shaft 23 that rotates integrally with the rotator 29. Further, the sensor magnet 45 may be embedded in both the rotating bodies 35 and 29.

  In the above embodiment, the sensor magnet 45 is completely embedded in the drive-side rotator 35. However, if it is possible to prevent scattering of fragments due to cracking of the sensor magnet 45, only a part of the magnet 45 may be embedded. .

  In the above embodiment, the drive-side rotator 35 has a plurality of through holes 35d and 35e formed at predetermined portions by magnet support pins for supporting the sensor magnet 45 in the mold during molding. The positions where the through holes 35d and 35e are formed are not limited to this. For example, as shown in FIG. 8, only the through hole 35 e at the other end of the drive side rotating body 35 may be used, and it may be closed by a covering portion 43 d provided continuously with the buffer portion 43. Alternatively, only the through-hole 35d at one end of the drive-side rotator 35 may be provided and closed by a covering portion 38a provided continuously with the elastic holding portion 38. Further, the covering portions 38a and 43d may be omitted if the debris can be prevented from being scattered due to the breakage of the sensor magnet 45.

  In the above embodiment, the connecting portion 6a of the rotating shaft 6 and the connecting hole 35b of the drive side rotating body 35 are connected in a loosely fitted state, but they may be connected without a gap. In this case, it is possible to omit the elastic holding portion 38 provided in consideration of the drive-side rotator 35 falling off the rotating shaft 6.

  In the above embodiment, the clutch 20 is provided between the rotary shaft 6 and the worm shaft 23. However, the clutch 20 may be provided between two shafts other than the rotary shaft 6 and the worm shaft 23. The clutch 20 transmits the rotation from the rotating shaft 6 side to the worm shaft 23 side via the driving side rotating body 35 and the driven side rotating body 29, while the rotation from the worm shaft 23 side is transmitted to the driven side rotating body 29. However, the operation is not limited to this.

In the above embodiment, the present invention is applied to the motor 1 that is the drive source of the power window device, but may be applied to a motor that is used other than that device.
The technical idea that can be grasped from each of the above embodiments will be described below.

(A) In the rotation transmission device according to any one of claims 1 to 5,
The rotation from the drive shaft side is transmitted to the driven shaft side via the drive side rotating body and the driven side rotating body, while the rotation from the driven shaft side is blocked by the driven side rotating body. A rotation transmission device that is a clutch that prevents transmission to the drive shaft side.

(B) In the motor according to any one of claims 7 to 11,
The rotation transmission device transmits the rotation from the rotating shaft side to the worm shaft side via the driving side rotating body and the driven side rotating body, while rotating from the worm shaft side to the driven side rotating body. A motor which is a clutch which prevents the transmission at the rotation shaft side and prevents the transmission to the rotating shaft side.

Sectional drawing of the motor of this embodiment. The principal part expanded sectional view of the motor which shows a clutch part. The disassembled perspective view of a clutch part. AA sectional drawing of FIG. Sectional drawing for demonstrating operation | movement of a clutch. Sectional drawing for demonstrating operation | movement of a clutch. Sectional drawing of a drive side rotary body. Sectional drawing of the drive side rotary body of another example.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 6 ... Rotating shaft as a drive shaft, 6a ... Connection part, 20 ... Clutch as a rotation transmission device, 23 ... Worm shaft as a driven shaft, 29 ... Driven side rotary body, 35 ... Drive side rotary body, 35b ... Connection hole , 35d, 35e, through holes, 38, elastic holding portions, 38a, 43d, covering portions, 45, sensor magnets.

Claims (11)

A drive-side rotator provided so as to rotate integrally with the drive shaft; and a driven-side rotator provided so as to be rotatable integrally with the driven shaft and connected to the drive-side rotator. A rotation transmission device including a sensor magnet that is mounted on the rotating body corresponding to the detection target so as to be integrally rotatable so as to detect a rotation state of at least one of the shafts,
The rotating body corresponding to the detection target is made of a resin molded product, and at least a part of the magnet is embedded in the rotating body by insert molding in order to prevent scattering of fragments due to cracking of the sensor magnet. Rotation transmission device. The rotation transmission device according to claim 1,
The rotation transmission device, wherein the sensor magnet is entirely embedded in the rotating body. In the rotation transmission device according to claim 1 or 2,
The drive shaft has a connecting portion that engages with the drive side rotator in the rotation direction,
The drive-side rotator has a connection hole that is connected to a connecting portion of the drive shaft so as to be freely fitted and integrally rotatable. In the rotation transmission device according to claim 3,
The drive-side rotator has an elastic holding mechanism that holds the rotator by an elastic force with respect to the drive shaft so as to prevent the drive-side rotator from dropping from the connecting portion of the drive shaft in the vicinity of the connection hole. A rotation transmission device characterized in that the portion is integrally formed. The rotation transmission device according to claim 4,
The sensor magnet is embedded in the drive-side rotator, and the drive-side rotator is formed with a through-hole penetrating to the sensor magnet at the time of molding.
The rotation transmission device, wherein the through hole is closed by a covering portion made of the same material as the elastic holding portion. It is a manufacturing method of the component of the rotation transmission device according to claim 5,
A method of manufacturing a component part of a rotation transmission device, wherein a covering portion that closes the through-hole formed at the time of forming the drive-side rotating body and the elastic holding portion are simultaneously formed. A motor body that rotationally drives the rotating shaft;
A speed reducer including a worm shaft that is assembled with the motor body and is part of a speed reduction mechanism that is drivingly connected to the rotation shaft and decelerates rotation of the rotation shaft;
A drive-side rotator provided so as to be integrally rotatable with the rotating shaft; and a driven-side rotator provided so as to be integrally rotatable with the worm shaft and connected to the drive-side rotator. A motor having a rotation transmission device including a sensor magnet that is mounted on the rotating body corresponding to the detection target so as to detect rotation of at least one of the worm shafts.
The rotating body corresponding to the detection target is made of a resin molded product, and at least a part of the magnet is embedded in the rotating body by insert molding in order to prevent scattering of fragments due to cracking of the sensor magnet. motor. The motor according to claim 7, wherein
The motor, wherein the sensor magnet is entirely embedded in the rotating body. The motor according to claim 7 or 8,
The rotating shaft has a connecting portion that is locked with the driving side rotating body in a rotating direction,
The drive-side rotator has a connection hole that is connected to a connecting portion of the rotating shaft so as to be freely fitted and integrally rotatable. The motor according to claim 9, wherein
The drive-side rotator has an elastic holding mechanism that holds the rotator by an elastic force with respect to the rotation shaft so as to prevent the drive-side rotator from dropping from the connecting portion of the rotation shaft in the vicinity of the connection hole. A motor characterized in that the part is integrally formed. The motor according to claim 10, wherein
The sensor magnet is embedded in the drive-side rotator, and the drive-side rotator is formed with a through-hole penetrating to the sensor magnet at the time of molding.
The motor is characterized in that the through hole is closed by a covering portion made of the same material as the elastic holding portion.

Images