JP5335341B2 - motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motor which is high in the accuracy of concentricity between a rotating shaft and a connecting shaft while facilitating the molding of a resin-made housing, and furthermore, can reduce the generation of noise and the degradation of efficiency caused by axial displacement between the rotating shaft and the connecting shaft. <P>SOLUTION: The motor includes a motor body 2 which is substantially accommodated in a substantially-bottomed yoke 4, and rotationally drives the rotating shaft 6 whose own base end side is rotatably supported by a bearing fixed to the bottom of the yoke 4, and a speed reduction part 3 having a worm shaft 14 which is accommodated in a resin-made gear housing 21 assembled into the opening end of the yoke 4, and whose own base end is connected to the tip of the rotating shaft 6 which is rotatably supported on the same axis as that of the rotating shaft 6 via a clutch 30. The bearing 15 rotatably supporting the base end side of the worm shaft 14 is fixed to a connecting shaft base-end bearing fixing part 12f of a metal-made bearing holding member 12 having an engagement part (end engagement part 12c and internal periphery engagement part 12d) which is directly engaged with the yoke 4. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a motor in which, for example, a rotating shaft of a motor body is connected to a worm shaft housed in a resin gear housing.

Conventionally, as a motor, a motor body that rotationally drives a rotating shaft housed in a substantially bottomed cylindrical yoke, a housing housed in a gear housing assembled to the opening end of the yoke, and a tip portion of the rotating shaft Some have a reduction portion having a worm shaft (connection shaft) whose base end portion is connected via a clutch (see, for example, Patent Document 1). The base end portion of the rotating shaft in such a motor is rotatably supported by a bearing fixed to the bottom of the yoke. The tip of the rotating shaft is rotatably supported by a bearing fixed to a resin brush holder assembled to the yoke or a bearing fixed to a clutch (its collar) fixed to the gear housing. The worm shaft is rotatably supported by a bearing whose base end and tip end are fixed to the gear housing.
International Publication (WO) 00/08349

  However, in the motor as described above, when the gear housing is made of resin and the molding dimensional accuracy is low, at least the bearing that supports the base end of the rotating shaft and the bearing that supports the base end of the worm shaft There is a problem that the degree of coaxiality is lowered, and consequently the degree of coaxiality between the rotating shaft and the connecting shaft is lowered (axial deviation occurs). In addition, the shaft misalignment between the rotating shaft and the connecting shaft may cause noise and decrease efficiency. Further, if it is attempted to increase the molding dimensional accuracy of the resin gear housing so as to make the coaxiality highly accurate, for example, the cost of the resin molding die becomes high.

  The present invention has been made in order to solve the above-described problems. The object of the present invention is to make it easy to mold a resin housing, while making the coaxiality of the rotating shaft and the connecting shaft highly accurate, and thus the rotating shaft. Another object of the present invention is to provide a motor capable of reducing the occurrence of abnormal noise and the reduction in efficiency due to the displacement of the connecting shaft.

According to the first aspect of the present invention, a rotary shaft that is substantially housed in a substantially bottomed cylindrical yoke and is rotatably supported by a bearing fixed to the bottom of the yoke is rotatably driven. The motor main body and a housing made of resin that is assembled to the opening end of the yoke and are supported so as to be rotatable coaxially with the rotating shaft, and the distal end portion of the rotating shaft and the base end portion of the rotating shaft are connected. A motor including a connection drive unit having a connection shaft connected via a member, wherein the bearing that rotatably supports the base end side of the connection shaft is an engagement unit that directly engages with the yoke Fixed to the connecting shaft base end bearing fixing portion of the metal bearing holding member with the connecting shaft base end bearing fixing portion being housed in the housing, and the bearing holding member of a single member, The connecting shaft base end bearing fixing portion and the front end side of the rotating shaft Bearing that rotatably supports is configured to include a rotation shaft bearing fixing portion fixed.

  According to this configuration, the bearing that supports the base end side of the connecting shaft in the housing is fixed to the connecting shaft base end bearing fixing portion of the metal bearing holding member having the engaging portion that directly engages with the yoke. Therefore, the coaxiality between the bearing that supports the base end side of the rotating shaft at the bottom of the yoke and the bearing that supports the connecting shaft in the housing can be made highly accurate regardless of the molding dimensional accuracy of the resin housing. . Therefore, the coaxiality of the rotating shaft and the connecting shaft can be made highly accurate while facilitating the molding of the resin housing, and it is possible to reduce the occurrence of abnormal noise and the reduction in efficiency due to the shaft misalignment.

Further, since the bearing that rotatably supports the tip end side of the rotating shaft is fixed to the rotating shaft bearing fixing portion of the metal bearing holding member having the engaging portion that directly engages with the yoke, for example, the bearing is Compared with the case of fixing to a resin brush holder assembled to the yoke, the degree of coaxiality between the bearings supporting the tip end of the rotating shaft can be made high. Therefore, for example, regardless of the molding dimensional accuracy of the resin brush holder, that is, while facilitating the molding, it is possible to make the coaxiality of the rotating shaft and the connecting shaft more accurate, and the difference based on the misalignment between them. Sound generation and efficiency reduction can be further reduced.
According to a second aspect of the present invention, in the motor according to the first aspect, the motor main body has a resin brush holder main body, and the brush holder main body is integrally formed with the bearing holding member. .

  According to this configuration, since the brush holder main body and the bearing holding member are integrally formed, assembly is facilitated. Furthermore, the vibration of the bearing holding member that directly engages with the yoke by the resin brush holder body (amplification of vibration due to the engagement of metals) is suppressed.

  According to a third aspect of the present invention, in the motor according to the first or second aspect, the connecting member generates a rotational force from the rotating shaft depending on whether or not the rolling element is sandwiched between circular inner peripheral surfaces. A clutch that transmits to a connecting shaft and does not transmit a rotational force from the connecting shaft to the rotating shaft, wherein the bearing holding member includes a cylindrical clutch collar portion having the inner peripheral surface.

  According to this configuration, the distal end portion of the rotating shaft and the base end portion of the connecting shaft transmit the rotational force from the rotating shaft to the connecting shaft depending on whether or not the rolling element is sandwiched between the circular inner peripheral surfaces, It is connected via a clutch that does not transmit the rotational force from the shaft to the rotating shaft. In general, a collar member having a circular inner peripheral surface of such a clutch is fixed to the housing, but according to the configuration, the clutch collar portion having a circular inner peripheral surface is directly engaged with the yoke. Since the metal bearing holding member having the engaging portion is provided, the coaxiality between the clutch and the both bearings can be made high accuracy irrespective of the molding dimensional accuracy of the resin housing. Therefore, while making it easy to mold the resin housing, the coaxiality of the rotating shaft, the connecting shaft, and the clutch can be made highly accurate. Can be reduced.

According to a fourth aspect of the present invention, in the motor according to any one of the first to third aspects, the bearing holding member is a coupling shaft to which a bearing that rotatably supports the distal end side of the coupling shaft is fixed. A tip bearing fixing portion was provided.

  According to this configuration, the bearing that rotatably supports the distal end side of the connecting shaft is fixed to the connecting shaft tip bearing fixing portion of the metal bearing holding member having the engaging portion that directly engages with the yoke. The degree of coaxiality with other bearings can also be made highly accurate. Therefore, regardless of the molding dimensional accuracy of the resin housing, that is, while facilitating the molding, it is possible to make the coaxiality of the rotating shaft and the connecting shaft more accurate, and the generation of abnormal noise based on the misalignment of those shafts The reduction in efficiency can be further reduced.

According to a fifth aspect of the present invention, in the motor according to any one of the first to fourth aspects, the engaging portion includes an inner peripheral engaging portion that directly engages with an inner peripheral surface of the yoke, An end engaging portion that directly engages with the opening direction end of the yoke was provided.

According to the same configuration, the inner peripheral engaging portion of the engaging portion directly engages with the inner peripheral surface of the yoke, so that the positioning of the bearing holding member, and thus the shaft orthogonal direction position of the bearing fixed thereto, becomes highly accurate. Furthermore, since the end engaging portion of the engaging portion directly engages with the end portion of the yoke in the opening direction, the positioning of the bearing holding member, and thus the axial position of the bearing fixed thereto, becomes highly accurate.

  According to the present invention, while facilitating the molding of a resin housing, the coaxiality of the rotating shaft and the connecting shaft is made highly accurate, and consequently, the generation of abnormal noise and the reduction in efficiency due to the axial deviation between the rotating shaft and the connecting shaft are reduced. The motor which can be provided can be provided.

  Hereinafter, an embodiment embodying the present invention will be described with reference to FIGS. FIG. 1 shows a cross-sectional view of a motor 1 for a vehicle power window device. The motor 1 includes a motor body 2 and a speed reduction unit 3 as a connection drive unit.

The motor body 2 includes a yoke 4, a pair of magnets 5, an armature (armature) 7 having a rotating shaft 6, a commutator 8, a brush holder member 9, and a power supply brush B.
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 accommodated inside the magnet 5. The base end side of the rotating shaft 6 in the armature 7 is rotatably supported by a bearing 10 fixed at the bottom center of the yoke 4. A commutator 8 is fixed to a predetermined portion on the tip side of the rotating shaft 6. Further, as shown in FIG. 2, a connecting portion 6a having a two-surface width shape is formed at the tip of the rotating shaft 6.

  A brush holder member 9 is assembled in the opening of the yoke 4. The brush holder member 9 includes a resin brush holder main body 11 and a metal bearing holding member 12 formed integrally with the brush holder main body 11 (outsert molding). The brush holder body 11 includes a holder body 11a (see FIG. 3) having a shape that substantially covers the opening of the yoke 4, and a radially outer side of the yoke 4 that is integrally provided from the holder body 11a (left side in FIG. 1). The connector part 11b which protrudes in this is provided.

  A pair of power supply brushes B that are connected to the connector portion 11b by a wiring (not shown) and are in sliding contact with the commutator 8 are respectively held by the brush holding portion 11c on the yoke 4 side of the holder main body portion 11a. The power supply brush B supplies an external power source supplied through the connector portion 11b to the coil winding wound around the armature core in the armature 7 through the commutator 8, and the armature 7 (rotary shaft 6) is supplied. Drive to rotate.

  As shown in FIGS. 2 and 3, the bearing holding member 12 includes a substantially oval plate-like portion 12a corresponding to the opening of the yoke 4, and a cylindrical shape extending from the center of the plate-like portion 12a in the axial direction. A cylindrical portion 12b penetrating therethrough.

  Most of the plate-like portion 12a is embedded in the holder main body portion 11a. And in the plate-shaped part 12a, the both ends of the direction along the flat surface 4a (refer FIG. 3) of the yoke 4 (left-right direction in FIGS. 1-3) extend outside (radial direction), and the holder main-body part 11a. An end engaging portion 12c is formed which is exposed from and is directly engaged (contacted) with the flange portion 4b at the end of the yoke 4 in the opening direction. Further, in the plate-like portion 12a, both ends of the yoke 4 in the direction (left and right direction in FIGS. 1 to 3) along the flat surface 4a (see FIG. 3) are axial directions (upward in FIG. 2). 3, an inner peripheral engagement portion 12d is formed that extends in the front side of the paper surface and is exposed from the holder main body portion 11a and directly engages (contacts) with the inner peripheral surface 4c of the yoke 4. In addition, as shown in FIG. 3, the end engaging portion 12c in the present embodiment is formed at the center in the orthogonal direction (vertical direction in FIG. 3) of the flat surface 4a. Further, in the present embodiment, the inner peripheral engagement portions 12d are paired on both sides in the orthogonal direction (vertical direction in FIG. 3) of the flat surface 4a (that is, a total of four corresponding to the substantially four corners of the yoke 4). Is formed. In the present embodiment, the end engaging portion 12c and the inner peripheral engaging portion 12d constitute an engaging portion.

  As shown in FIG. 2, the cylindrical portion 12b is provided so that most of the cylindrical portion 12b (excluding the base end portion) is exposed from the holder main body portion 11a. And the base end side of the cylindrical part 12b is made into the rotating shaft bearing fixing | fixed part 12e to which the bearing 13 which rotatably supports the front end side of the rotating shaft 6 is fixed. Further, the distal end portion of the cylindrical portion 12b is a connecting shaft base end bearing fixing portion 12f to which a bearing 15 that rotatably supports a base end side of a worm shaft 14 as a connecting shaft described later is fixed. Further, an intermediate portion of the cylindrical portion 12b (between the rotary shaft bearing fixing portion 12e and the connecting shaft base end bearing fixing portion 12f) is a clutch collar portion 31 in a clutch 30 as a connecting member described later. The rotary shaft bearing fixing portion 12e and the connecting shaft base end bearing fixing portion 12f of the present embodiment have a shape (cylindrical shape) in which the outer circumferences of the bearings 13 and 15 are press-fitted and fixed to the inner circumferential surface thereof. The rotary shaft bearing fixing portion 12e, the connecting shaft base end bearing fixing portion 12f, and the clutch collar portion 31 are formed to have the same diameter, that is, the diameter of the cylindrical portion 12b is constant.

The speed reduction unit 3 includes a gear housing 21 as a housing, the worm shaft 14, a worm wheel 22, and an output shaft 23.
The gear housing 21 is made of resin and, as shown in FIG. 1, is fixed to the open end (flange portion 4b) of the yoke 4 while holding the brush holder member 9 (the portion including the end engaging portion 12c). The fixing portion 21a is provided.

  An accommodation recess 21b (see FIG. 2) that can accommodate the cylindrical portion 12b of the bearing holding member 12 is located at the center of the fixed portion 21a of the gear housing 21 and corresponding to the axis center of the rotating shaft 6. Further, a worm shaft housing portion 21c capable of housing the worm shaft 14 is formed at the center of the bottom of the housing recess 21b. And the cylindrical part 12b of the said bearing holding member 12 is loosely fitted by the said accommodation recessed part 21b, and the worm shaft 14 which protruded from the said cylindrical part 12b is accommodated in the worm shaft accommodating part 21c. The worm shaft 14 is rotatably supported by a bearing 15 whose base end side is fixed to the connecting shaft base end bearing fixing portion 12f (see FIG. 2) on the same axis as the rotary shaft 6, and the tip end side thereof is the worm shaft. It is rotatably supported by a bearing 24 (see FIG. 1) fixed to the bottom of the shaft accommodating portion 21c.

  Further, a wheel housing portion 21d communicating with the worm shaft housing portion 21c is formed in the direction orthogonal to the axis of the intermediate portion of the worm shaft housing portion 21c of the gear housing 21 (right direction in FIG. 1). The wheel housing portion 21d accommodates the worm wheel 22 so as to be rotatable about the axis in the direction perpendicular to the worm shaft 14 (the direction perpendicular to the plane of FIG. 1) so that the worm wheel 22 meshes with the worm 14a of the worm shaft 14. Has been. The output shaft 23 is coupled to the worm wheel 22 so as to rotate coaxially with the rotation of the worm wheel 22. The output shaft 23 is connected to a window glass (not shown) via a known regulator (not shown).

  Whether or not the clutch 30 that connects the rotating shaft 6 and the worm shaft 14 holds the rolling element 32 (see FIGS. 2 and 4) between the circular inner peripheral surface 31 a of the clutch collar portion 31. Thus, the rotational force from the rotating shaft 6 is transmitted to the worm shaft 14, and the rotating force from the worm shaft 14 is not transmitted to the rotating shaft 6 (they are prevented from rotating). That is, the clutch 30 transmits the rotational force of the rotating shaft 6 based on the drive of the motor body 2 to the worm shaft 14, while the load side (window regulator) passes through the output shaft 23 and the worm wheel 22 to the worm shaft 14. When the rotational force is applied, the rotation of the worm shaft 14 is prevented so that the rotational force is not transmitted to the rotational shaft 6.

  Specifically, as shown in FIGS. 2 and 4, the clutch 30 includes a driven side rotating body 29 formed at the base end portion of the worm shaft 14 disposed in the clutch collar portion 31, and 3 Two rolling elements 32, a support member 33, a driving side rotating body 34 fitted to the connecting portion 6 a of the rotating shaft 6, and a ball 35 are provided.

  As shown in FIG. 2, the driven-side rotator 29 has a disk portion 29a whose diameter is enlarged at the proximal end portion of the worm shaft 14, and the motor body 2 side (rotary shaft 6 side) from the axis center of the disk portion 29a. The shaft portion 29b extends, and three engaging convex portions 29c (see FIG. 4) that extend radially outward from the shaft portion 29b at an equal angle (120 °) interval. As shown in FIG. 4, the engagement convex portion 29 c is formed so that the width in the circumferential direction increases toward the outer side in the radial direction. Further, the radially outer surface of the engaging convex portion 29c is a substantially flat control surface 41 so that the distance from the inner peripheral surface 31a of the clutch collar portion 31 changes in the rotational direction. As shown in FIG. 2, a circular concave portion 29d is formed in the shaft center portion of the shaft portion 29b on the motor body 2 side (rotary shaft 6 side).

  Each rolling element 32 is formed in a substantially cylindrical shape with a metal material, and is disposed between the control surface 41 of the engaging convex portion 29 c and the inner peripheral surface 31 a of the clutch collar portion 31 as shown in FIG. 4. Yes. 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 31a, and the side portions (rotational direction end portions) 41b, 41c of the control surface 41 It is set larger than the length of the interval between the inner peripheral surfaces 31a. That is, the diameter of the rolling element 32 is set to be equal to the length of the interval between the central portion 41a and the intermediate portion 41d between the side portions 41b and 41c and the inner peripheral surface 31a.

  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 resin, and as shown in FIGS. 2 and 4, the ring member 33a (see FIG. 2) and the ring member 33a extend in the axial direction to surround the rolling element 32. 3 pairs of support parts 33b (refer FIG. 4) arrange | positioned so that it may be pinched | interposed in a direction (so that it may not clamp).

  The drive-side rotating body 34 is formed of a resin material, and as shown in FIG. 2, a shaft portion 34a to which the connecting portion 6a of the rotating shaft 6 is fitted, and a disk whose diameter is larger than that of the shaft portion 34a. Part 34b and an extending part 34c extending in the axial direction (downward in FIG. 2) from the axial center of the disk part 34b. A ball receiving recess 34d is formed at the tip of the extending portion 34c, and the ball 35 is held in the ball receiving recess 34d in a state where a part of the ball 35 protrudes from the tip of the extending portion 34c. The extending portion 34c is substantially accommodated in the recessed portion 29d of the driven-side rotator 29, and the ball 35 partially protruding from the tip of the extending portion 34c is in contact with the bottom portion of the recessed portion 29d.

  As shown in FIG. 4, a substantially fan-shaped projecting portion 42 projecting radially outward and in the axial direction is equiangular on the distal end side (lower side in FIG. 2) of the disk portion 34b of the drive side rotating body 34. A plurality (three) are formed at intervals. As shown in FIG. 4, each protruding portion 42 is formed along the inner peripheral surface 31a with a large arc surface having a slightly smaller diameter than the inner peripheral surface 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. The projecting portions 42 are disposed in the clutch collar portion 31 between the engaging convex portions 29c of the driven-side rotating body 29 and between the rolling elements 32 (support portions 33b).

  A buffer member 43 made of rubber is fitted and fixed in the fitting groove 42a. The buffer member 43 is formed with a buffer portion 43a that protrudes radially inward of the projecting portion 42 from the fitting groove 42a and spreads in the circumferential direction.

As shown in FIG. 4, the circumferential width of the buffer portion 43 a is set slightly larger than the circumferential width of the inner circumferential surface of the projecting portion 42.
One side surface (counterclockwise surface) 43b of the buffer portion 43a is engaged when the drive-side rotator 34 rotates to a predetermined position in the counterclockwise direction (arrow X direction) with respect to the driven-side rotator 29. It abuts on a first buffer surface 29e formed on the radially inner side of the surface of the portion 29c in the clockwise direction. 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 34 further rotates counterclockwise (arrow X direction) from the predetermined position. Then, it comes into contact with the first contact surface 29f formed on the radially outer side of the surface on the clockwise side of the engagement convex portion 29c. The drive side rotating body 34 further rotates counterclockwise (arrow X direction) from the predetermined position when the buffer portion 43a bends (crushes) in the circumferential direction (see FIG. 5).

  Further, the other side surface (counterclockwise surface) 43c of the buffer portion 43a is engaged when the driving side rotating body 34 rotates clockwise (arrow Y direction) with respect to the driven side rotating body 29 to a predetermined position. It abuts against a second buffer surface 29g formed on the radially inner side of the counterclockwise surface of the convex portion 29c. Further, the other side surface (clockwise side surface) 42c formed on the radially inner side of the projecting portion 42 is engaged when the drive side rotating body 34 rotates further clockwise (arrow Y direction) from the predetermined position. It abuts on a second abutment surface 29h formed on the radially outer side of the counterclockwise surface of the mating convex portion 29c. The drive-side rotator 34 rotates further in the clockwise direction (arrow Y direction) from the predetermined position when the buffer portion 43a is bent (collapsed) in the circumferential direction.

  Here, as shown in FIG. 5, the shape of each member 32, 42, 29c, 33b is such that one side surface 42b of the projecting portion 42 abuts on the first contact surface 29f of the engaging convex portion 29c. The rolling element 32 is disposed at a position corresponding to the central portion 41a of the control surface 41 in a state where the first pressing surface 42d formed on the radially outer side of the counterclockwise surface of the portion 42 is in contact with the support portion 33b. Is set to be.

  Further, the shape of each member 32, 42, 29c, 33b is such that the other side surface 42c of the projecting portion 42 contacts the second contact surface 29h of the engaging convex portion 29c, and the clockwise surface of the projecting portion 42 is formed. The rolling element 32 is set to be disposed at a position corresponding to the central portion 41a of the control surface 41 in a state where the second pressing surface 42e formed on the outer side in the radial direction is in contact with the support portion 33b.

  In the motor 1 configured as described above (clutch 30), when the motor body 2 is driven and the rotating shaft 6 is rotated in the counterclockwise direction (arrow X direction) in FIG. 34 (projecting portion 42) rotates integrally in the same direction (arrow X direction). As shown in FIG. 5, when the one side surface 42b of the projecting portion 42 comes into contact with the first contact surface 29f of the engagement convex portion 29c and the first pressing surface 42d comes into contact with the support portion 33b, 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 addition, before the one side surface 42b of the projecting portion 42 contacts the first contact surface 29f, the one side surface 43b of the buffer portion 43a contacts the first buffer surface 29e of the engaging convex portion 29c first. The impact on contact is reduced.

  In this neutral state, the rolling element 32 is not sandwiched between the control surface 41 of the engaging convex portion 29 c and the inner peripheral surface 31 a, so that the driven side rotating body 29 can rotate with respect to the clutch collar portion 31. Therefore, when the driving side rotating body 34 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 to the rolling element 32 from the first pressing surface 42d, and the rolling element 32 moves in the same direction.

  Conversely, when the rotating shaft 6 is rotated in the clockwise direction in FIG. 4 (arrow Y direction), the rolling element 32 is disposed at the neutral position by the projecting portion 42 as described above. In this state, since the rolling element 32 is not sandwiched between the control surface 41 of the engaging convex portion 29 c and the inner peripheral surface 31 a, the driven side rotating body 29 can rotate with respect to the clutch collar portion 31. Accordingly, the rotational force of the driving side rotating body 34 is transmitted from the projecting portion 42 to the driven side rotating body 29, and the driven side rotating body 29 is rotated.

  Then, the worm shaft 14 rotates together with the driven-side rotator 29, and the worm wheel 22 and the output shaft 23 rotate according to the rotation. Accordingly, the window glass connected to the output shaft 23 is opened and closed.

  On the other hand, when a load is applied to the output shaft 23 while the motor 1 is stopped, the load tries to rotate the driven-side rotator 29. When the driven-side rotator 29 is rotated in the clockwise direction (arrow Y direction) in FIG. 4, the rolling element 32 is moved to the side portion 41b side (intermediate portion 41d side) of the control surface 41 of the engaging convex portion 29c. Move relative. Eventually, as shown in FIG. 6, when the rolling element 32 relatively moves to the intermediate portion 41d, the rolling element 32 is sandwiched between the control surface 41 and the inner peripheral surface 31a (becomes locked). Therefore, the further rotation of the driven side rotating body 29 is prevented, and the driving side rotating body 34 is not rotated.

  Conversely, when the driven side rotating body 29 is rotated in the counterclockwise direction (arrow X direction) in FIG. 4, the driving side rotating body 34 is stopped, so that the rolling body 32 controls the engagement convex portion 29c. It moves relative to the side 41c side (intermediate part 41d side) of the surface 41. Eventually, when the rolling element 32 relatively moves to the intermediate portion 41d, the rolling element 32 is sandwiched between the control surface 41 and the inner peripheral surface 31a (becomes locked). Therefore, the further rotation of the driven side rotating body 29 is prevented, and the driving side rotating body 34 is not rotated.

  As described above, even if a large load is applied to the output shaft 23 side, the rotation of the driven side rotating body 29 is prevented. Therefore, the window glass connected to the output shaft 23 is prevented from being opened and closed by its own weight or an external force.

Next, characteristic effects of the above embodiment will be described below.
(1) The worm shaft is connected to the connecting shaft proximal bearing fixing portion 12f of the metal bearing holding member 12 having the engaging portions (the end engaging portion 12c and the inner peripheral engaging portion 12d) that directly engage with the yoke 4. Since the bearing 15 that supports the base end side of the bearing 14 is fixed, the bearing 10 and the gear housing that support the base end side of the rotary shaft 6 at the bottom of the yoke 4 regardless of the molding dimensional accuracy of the resin gear housing 21. The degree of coaxiality with the bearing 15 that supports the proximal end side of the worm shaft 14 within the shaft 21 can be made highly accurate. Therefore, it is possible to make the coaxiality of the rotary shaft 6 and the worm shaft 14 highly accurate while facilitating the molding of the resin gear housing 21, and to reduce the generation of abnormal noise and a decrease in efficiency due to the shaft misalignment. Can do.

  (2) Since the brush holder main body 11 and the bearing holding member 12 are integrally formed, it is easy to assemble (for example, as compared with a case where they are separated). Further, the vibration of the bearing holding member 12 that is directly engaged with the yoke 4 by the resin brush holder body 11 (amplification of vibration due to the engagement of metals) is suppressed.

  (3) The tip of the rotating shaft 6 and the base end of the worm shaft 14 transmit the rotational force from the rotating shaft 6 to the worm shaft 14 depending on whether or not the rolling element 32 is sandwiched between the circular inner peripheral surfaces 31a. The rotational force from the worm shaft 14 is coupled via a clutch 30 that does not transmit to the rotational shaft 6. In general, a collar member having a circular inner peripheral surface of such a clutch is fixed to the gear housing. In this embodiment, the clutch collar portion 31 having a circular inner peripheral surface is provided with the bearing holding member. Since the member 12 is provided, the coaxiality between the clutch 30 and the bearings 10 and 15 can be made high accuracy regardless of the molding dimensional accuracy of the resin gear housing 21. Accordingly, the coaxiality of the rotary shaft 6, the worm shaft 14 and the clutch 30 can be made highly accurate while facilitating the molding of the resin gear housing 21, and the generation of abnormal noise and the reduction in efficiency due to the shaft misalignment can be achieved. The malfunction of the clutch 30 can be reduced.

  (4) Since the bearing 13 that rotatably supports the distal end side of the rotating shaft 6 is fixed to the rotating shaft bearing fixing portion 12e of the bearing holding member 12, for example, the resin 13 that is assembled to the yoke 4 is made of resin. Compared with the case of fixing to the brush holder, the coaxiality of the bearings 13 and 15 that support the distal end side of the rotating shaft 6 can be made high accuracy. Therefore, for example, the coaxiality of the rotary shaft 6 and the worm shaft 14 can be made more accurate regardless of the molding dimensional accuracy of the resin brush holder (brush holder main body 11), that is, while facilitating the molding. Therefore, it is possible to further reduce the generation of abnormal noise and the decrease in efficiency based on the misalignment.

  (5) In the bearing holding member 12, the engaging portion that directly engages with the yoke 4 includes an inner peripheral engaging portion 12 d that directly engages (contacts) with the inner peripheral surface 4 c of the yoke 4, and the opening direction of the yoke 4. An end engaging portion 12c that directly engages (contacts) the flange portion 4b of the end portion is provided. In this way, the inner peripheral engagement portion 12d directly engages with the inner peripheral surface 4c of the yoke 4, so that the positioning of the bearing holding member 12, and the bearings 13 and 15 fixed to the bearing holding member 12, and the bearings 13 and 15 fixed in the axial orthogonal direction position is high. It becomes accuracy. Further, the end engaging portion 12c is directly engaged with the opening direction end portion (flange portion 4b) of the yoke 4 so that the axial position of the bearing holding member 12 and the bearings 13 and 15 fixed thereto can be positioned. High accuracy.

  (6) Since the clutch collar portion 31 and the rotary shaft bearing fixing portion 12e are formed in a cylindrical shape having the same diameter as the connecting shaft base end bearing fixing portion 12f, for example, the clutch collar portion 31 and the rotary shaft bearing fixing portion 12e are provided. Compared to the case where the connecting shaft base end bearing fixing portion 12f is formed in a cylindrical shape having a different diameter, the bearing holding member 12 has a simple shape and is easy to manufacture.

The above embodiment may be modified as follows.
As shown in FIG. 7, the bearing holding member 12 of the above embodiment includes a connecting shaft tip bearing fixing portion 52 to which a bearing 51 that rotatably supports the tip side of the worm shaft 14 (connecting shaft) is fixed. It is also good. That is, as shown in FIG. 7, the cylindrical portion 12 b in the bearing holding member 12 of the above embodiment may be extended and its tip portion may be used as a connecting shaft tip bearing fixing portion 52.

  In this way, the bearing 51 that rotatably supports the distal end side of the worm shaft 14 is fixed to the connecting shaft distal end bearing fixing portion 52 of the bearing holding member 12, so that the bearing 51 also has other bearings 10, 13. , 15 can be made highly accurate. Therefore, irrespective of the molding dimensional accuracy of the resin gear housing 21, that is, while facilitating the molding, the coaxiality of the rotary shaft 6 and the worm shaft 14 can be made more accurate, and based on the misalignment thereof. Abnormal noise generation and efficiency reduction can be further reduced.

  In the above embodiment, the clutch collar portion 31 and the rotary shaft bearing fixing portion 12e are formed on the bearing holding member 12. However, the present invention is not limited to this, and the collar member having the same function as the clutch collar portion 31 or the bearing 13 is used. May be fixed to other members made of resin (gear housing 21 or brush holder body 11).

  In the above embodiment, the engaging portion of the bearing holding member 12 includes the inner peripheral engaging portion 12d and the end engaging portion 12c. If the relative position is not shifted, it may be changed to another engaging portion.

  In the above embodiment, the clutch collar portion 31 and the rotary shaft bearing fixing portion 12e are formed in a cylindrical shape having the same diameter as the connecting shaft base end bearing fixing portion 12f. The clutch collar portion 31 and the rotary shaft bearing fixing portion 12e may be formed in a cylindrical shape having a diameter different from that of the connecting shaft base end bearing fixing portion 12f.

  In place of the clutch 30 of the above-described embodiment, another connecting member that connects the rotary shaft 6 and the worm shaft 14 (for example, a configuration in which the rotary shaft 6 and the worm shaft 14 are simply connected so as to integrally rotate). ) May be changed.

  In the above embodiment, the bearing holding member 12 is outsert-molded on the resin brush holder main body 11, but is not limited thereto, and may be assembled with the brush holder main body 11, for example. . In addition, for example, a resin brush holder (brush holder body 11) that holds the power supply brush B is configured separately from the bearing holding member 12, and the brush holder is assembled with the yoke 4 separately from the bearing holding member 12. It is good.

-In above-mentioned embodiment, although this invention was actualized to the motor 1 for vehicle power window apparatuses, you may materialize to the motor used for another apparatus.
The technical idea that can be grasped from the above embodiments will be described below together with the effects thereof.

(B) pre-Symbol connecting shaft proximal bearing fixing portion, the outer periphery of the bearing is formed in a cylindrical shape is fixed to the inner peripheral surface thereof, said clutch collar, the rotary shaft bearing fixing portion, and the connecting shaft tip bearing At least one of the fixing portion, you wherein formed on the connecting shaft proximal bearing fixing portion and the same diameter of the tubular.

  According to this configuration, at least one of the clutch collar portion, the rotary shaft bearing fixing portion, and the connecting shaft tip bearing fixing portion is formed in a cylindrical shape having the same diameter as the connecting shaft base end bearing fixing portion. For this reason, the bearing holding member has a simple shape and is easy to manufacture. For example, when this configuration is applied to the configuration according to claim 2, the clutch collar portion is formed in a cylindrical shape having the same diameter as the connecting shaft base end bearing fixing portion, so that the clutch collar portion is connected to the connecting shaft base end bearing. The bearing holding member has a simple shape as compared with the case where it is formed in a cylindrical shape having a diameter different from that of the fixed portion, and its manufacture is facilitated.

FIG. 2 is a partial cross-sectional view of a motor in the present embodiment. FIG. 3 is a partially enlarged cross-sectional view of a motor in the present embodiment. The partial cross section figure which looked at the motor body in this embodiment from the direction of an axis. Sectional drawing of the clutch part in this Embodiment. Sectional drawing for demonstrating operation | movement of the clutch in this Embodiment. Sectional drawing for demonstrating operation | movement of the clutch in this Embodiment. The partial sectional view of the motor in another example.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 2 ... Motor main body, 3 ... Deceleration part (connection drive part), 4 ... Yoke, 6 ... Rotary shaft, 10, 13, 15, 51 ... Bearing, 11 ... Brush holder main body, 12 ... Bearing holding member, 12c ... End part Engagement part (engagement part), 12d ... Inner circumference engagement part (engagement part), 12e ... Rotating shaft bearing fixing part, 12f ... Connection shaft base end bearing fixing part, 14 ... Worm shaft (connection shaft), 21 DESCRIPTION OF SYMBOLS ... Gear housing (housing), 30 ... Clutch (connection member), 31 ... Clutch collar part, 31a ... Inner peripheral surface, 32 ... Rolling element, 52 ... Connection shaft front-end bearing fixing part.

Claims (5)

A motor main body that rotationally drives a rotating shaft that is substantially housed in a substantially bottomed cylindrical yoke and is rotatably supported by a bearing fixed to the bottom of the yoke;
It is substantially housed in a resin housing assembled to the opening end of the yoke, and is supported rotatably on the same axis as the rotation shaft, and the distal end portion of the rotation shaft and the base end portion of the rotation shaft are connected via a connecting member. A motor having a connecting drive unit having a connecting shaft,
The bearing that rotatably supports the base end side of the connecting shaft is fixed to a connecting shaft base end bearing fixing portion of a metal bearing holding member having an engaging portion that directly engages with the yoke , and the connecting shaft The proximal bearing fixing portion is accommodated in the housing,
The single-member bearing holding member includes the connecting shaft base end bearing fixing portion and a rotating shaft bearing fixing portion to which a bearing that rotatably supports the distal end side of the rotating shaft is fixed. A motor characterized by The motor according to claim 1,
The motor main body has a resin brush holder main body, and the brush holder main body is integrally formed with the bearing holding member. The motor according to claim 1 or 2,
The connecting member transmits the rotational force from the rotating shaft to the connecting shaft and does not transmit the rotating force from the connecting shaft to the rotating shaft depending on whether or not the rolling element is sandwiched between circular inner peripheral surfaces. A clutch,
The motor according to claim 1, wherein the bearing holding member includes a cylindrical clutch collar portion having the inner peripheral surface. The motor according to any one of claims 1 to 3 ,
The motor according to claim 1, wherein the bearing holding member includes a connecting shaft tip bearing fixing portion to which a bearing that rotatably supports the tip side of the connecting shaft is fixed. The motor according to any one of claims 1 to 4 ,
The engaging portion includes an inner peripheral engaging portion that directly engages with an inner peripheral surface of the yoke, and an end engaging portion that directly engages with an opening direction end portion of the yoke. motor.

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