Motor device

Abstract

To provide a motor device capable of improving the fixing strength of a bearing member to a housing and thereby suppressing rattling of a speed reduction mechanism.SOLUTION: A bearing support member 37 that is attached to a housing 41 and supports the other axial side of a ball bearing 36 (an outer race 36b) from the axial direction can suppress the tilting of the ball bearing 36 with respect to the housing 41 when a lateral force is applied to a rotating shaft 34 since it is provided with an annular support portion 37c (an annular flat surface 37d) that supports the entire circumference of the other axial side of the ball bearing 36 (the outer race 36b) from the axial direction. Therefore, it is possible to improve the fixing strength of the ball bearing 36 to the housing 41 and to suppress rattling of a deceleration mechanism SD.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a motor device equipped with a speed reduction mechanism that reduces the rotation speed of a rotary shaft. [Background technology]

[0002] Conventionally, motor devices equipped with a reduction mechanism that are small yet provide large output have been used as on-board motors for vehicles such as automobiles. This makes it possible to easily install the motor device in a small space provided in the vehicle. Such a motor device is described, for example, in Patent Document 1.

[0003] The electric drive unit (motor device) described in Patent Document 1 includes an electric motor (motor) with a moving shaft (rotating shaft) that is rotated by the supply of a drive current, and a worm gear (worm wheel) that decelerates the rotation of the moving shaft to increase the torque and outputs the increased torque rotational force to the outside.

[0004] The inner race of a bearing member (ball bearing) is fixed to the moving shaft by fitting, and the outer race of the bearing member is pressed into a receiving hole in the transmission casing (housing). The outer race pressed into the receiving hole is held down by a U-shaped retaining portion with a notch. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Special Publication No. 2002-525005 Summary of the Invention [Problem to be solved by the invention]

[0006] However, in the motor device described in Patent Document 1, the outer race of the ball bearing is held down by a U-shaped retaining portion. In other words, only a portion of the entire circumference of the outer race is held down by the retaining portion. As a result, when the motor device is driven and a lateral force acts on the rotating shaft so as to separate the worm from the worm wheel, the ball bearing may tilt relative to the housing, causing the reduction mechanism to rattle.

[0007] An object of the present invention is to provide a motor device that can improve the fixing strength of a bearing member to a housing, and thereby suppress rattle of the reduction gear mechanism. [Means for solving the problem]

[0008] In one aspect of the present invention, a motor device includes a motor having a rotating shaft and a speed reduction mechanism that reduces the speed of rotation of the rotating shaft, the motor device including: a bearing member that rotatably supports the rotating shaft; a housing that accommodates the speed reduction mechanism and supports one axial side of the bearing member from the axial direction; and a bearing support member that is attached to the housing and supports the other axial side of the bearing member from the axial direction, the bearing support member including an annular support portion that supports the entire circumference of the other axial side of the bearing member from the axial direction. The annular support portion is provided with a pair of positioning protrusions that protrude from one axial side of the annular support portion and align the axis of the bearing member with the axis of the annular support portion. are. [Effects of the Invention]

[0009] According to the present invention, the bearing support member that is attached to the housing and supports the other axial side of the bearing member from the axial direction includes an annular support portion that supports the entire circumference of the other axial side of the bearing member from the axial direction, so that when a lateral force acts on the rotating shaft, tilt of the bearing member with respect to the housing can be suppressed, thereby improving the fixing strength of the bearing member to the housing and ultimately suppressing rattling of the reduction gear mechanism. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a schematic diagram showing a sunroof device installed on the roof of a vehicle. [Figure 2] FIG. 2 is a perspective view showing the output gear side of the sunroof motor. [Figure 3] FIG. 2 is a perspective view showing the cover member side of the sunroof motor. [Figure 4] FIG. 2 is a cross-sectional view of the sunroof motor taken along the axial direction of the rotation shaft. [Figure 5] FIG. 5 is an enlarged cross-sectional view of a portion A circled by a dashed line in FIG. [Figure 6] FIG. [Figure 7] FIG. 2 is a perspective view showing a bearing support member. [Figure 8] FIG. 1 is an exploded cross-sectional view illustrating an assembly procedure (1) of the sunroof motor. [Figure 9] FIG. 10 is an exploded perspective view illustrating an assembly procedure (2) of the sunroof motor. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

[0012] Figure 1 is a schematic diagram showing a sunroof device installed on the roof of a vehicle, Figure 2 is an oblique view showing the output gear side of a sunroof motor, Figure 3 is an oblique view showing the cover member side of a sunroof motor, Figure 4 is a cross-sectional view of the sunroof motor along the axial direction of the rotating shaft, Figure 5 is an enlarged cross-sectional view of the dashed circle A in Figure 4, Figure 6 is an oblique view showing the rotor, Figure 7 is an oblique view showing a bearing support member, Figure 8 is an exploded cross-sectional view explaining assembly procedure (1) of the sunroof motor, and Figure 9 is an exploded oblique view explaining assembly procedure (2) of the sunroof motor.

[0013] [Sunroof device overview] As shown in FIG. 1, a sunroof device 10 includes a roof panel 11. The roof panel 11 opens and closes an opening 14 formed in a roof 13 of a vehicle 12. A pair of shoes 15a, 15b is fixed to each of both sides of the roof panel 11 in the vehicle width direction (top and bottom sides in FIG. 1). Furthermore, a guide rail 16 extending in the front-to-rear direction of the vehicle 12 (left-to-right direction in FIG. 1) is fixed to each of both sides of the opening 14 in the roof 13 in the vehicle width direction. The pair of shoes 15a, 15b are guided by the corresponding pair of guide rails 16, causing the roof panel 11 to move in the front-to-rear direction of the vehicle 12.

[0014] One end of geared drive cables 17a, 17b is connected to each of the shoes 15b arranged on the rear side (right side in FIG. 1) of the vehicle 12. The other ends of the drive cables 17a, 17b are routed forward of the opening 14 of the vehicle 12 (left side in FIG. 1).

[0015] A sunroof motor (motor device) 20 is provided inside the roof 13, further forward of the opening 14 on the vehicle 12 than the windshield FG. The other ends of the pair of drive cables 17a, 17b are engaged with an output gear 47a provided on the sunroof motor 20. When the sunroof motor 20 is driven, the pair of drive cables 17a, 17b move in opposite directions along their length. As a result, the roof panel 11 is pushed and pulled by the pair of drive cables 17a, 17b via the pair of shoes 15b, opening and closing the opening 14.

[0016] [Sunroof motor overview] 2 to 4, the sunroof motor 20 includes an electric motor section (motor) 30 and a speed reduction mechanism section 40. The electric motor section 30 and the speed reduction mechanism section 40 are firmly connected to each other by a pair of first and second fastening screws S1 and S2, and are integrated (unitized).

[0017] [Electric motor] The electric motor section 30 is a brushless motor, i.e., a motor without brushes, and has a yoke (motor case) 31 formed into a cylindrical shape with a bottom by deep drawing or the like of a magnetic material such as a steel plate. The yoke 31 forms the outer shell of the electric motor section 30 and has a side wall section 31a formed in a substantially regular hexagonal cross section. One axial side of the side wall section 31a (the right side in FIGS. 2 to 4) is closed by a stepped bottom wall section 31b.

[0018] [stator] As shown in Figures 4 and 5, a stator 32 is housed inside the yoke 31. The stator 32 has a stator core 32a formed by laminating a plurality of thin steel plates (magnetic material). The stator core 32a is fixed to the yoke 31 and has a total of six teeth 32b (not shown in detail). Three-phase coils CL consisting of U-phase, V-phase, and W-phase are wound around these teeth 32b via insulators (insulating members) 32c.

[0019] [Rotor] The rotor 33 is rotatably mounted on the radially inner side of the stator 32 via a predetermined gap AG (air gap). As shown in FIGS. 4 to 6, the rotor 33 has a core body 33a formed in a substantially cylindrical shape. The core body 33a is formed by laminating a plurality of thin steel plates (magnetic material), and a total of four permanent magnets MG (see the shaded portion in FIG. 6) are fixed to the radially outer side of the core body 33a with an adhesive or the like. Specifically, the respective permanent magnets MG are arranged at equal intervals (90° intervals) around the circumferential direction of the core body 33a.

[0020] The radial outer side of each permanent magnet MG fixed to the core body 33a is covered with a magnet holder 33b formed into a generally cylindrical shape using a thin stainless steel plate or the like. This magnet holder 33b prevents the permanent magnets MG from falling off the core body 33a. As a result, even when the rotor 33 rotates at high speed, the centrifugal force generated by the rotation prevents the permanent magnets MG from falling off the core body 33a.

[0021] Here, the outer diameter of the magnet holder 33b is set to D1 (see FIG. 9), and this outer diameter D1 is the outer diameter of the largest part of the rotor 33 in the radial direction.

[0022] The rotating shaft 34 is fixed by press-fitting to the radially inner side of the core body 33a. In other words, the rotating shaft 34 is fixed to the center of rotation of the rotor 33. The rotating shaft 34 is made of a round steel bar (metal) to ensure sufficient strength. The axial base end side (right side in FIG. 4) of the rotating shaft 34 is accommodated inside the yoke 31 and rotatably supported by a first metal (radial bearing) BR1 attached to the bottom wall portion 31b of the yoke 31. Meanwhile, the axial tip end side (left side in FIG. 4) of the rotating shaft 34 is accommodated inside the housing 41 that forms the reduction mechanism 40 and rotatably supported by a second metal (radial bearing) BR2 attached to the worm receiving portion 49 of the housing 41.

[0023] Furthermore, a worm 35 that forms part of the speed reduction mechanism SD is provided integrally on the axial tip side of the rotating shaft 34. That is, the worm 35 is also made of a round steel bar, which increases the rigidity of the worm 35 and prevents the worm 35 from bending, thereby ensuring reliable meshing with the worm wheel 46.

[0024] Furthermore, a ball bearing (bearing member) 36 is provided at an axially intermediate portion of the rotating shaft 34. That is, the rotor 33 is provided alongside the ball bearing 36. This ball bearing 36 rotatably supports the rotating shaft 34. Specifically, the ball bearing 36 includes an inner race (inner ring) 36a formed of a steel material in a generally cylindrical shape, and an outer race (outer ring) 36b formed of a steel material in a generally cylindrical shape like the inner race 36a but with a larger diameter than the inner race 36a. Furthermore, a plurality of balls (steel balls) 36c are provided radially of the ball bearing 36 between the inner race 36a and the outer race 36b.

[0025] Here, the inner race 36a is fixed to the rotating shaft 34 by press fitting. In other words, the inner race 36a rotates together with the rotating shaft 34. Also, as shown in Fig. 4, the outer diameter of the rotating shaft 34 is larger than the outer diameter of the worm 35. This allows the ball bearing 36 to be press fitted into the rotating shaft 34 from the worm 35 side in the axial direction of the rotating shaft 34.

[0026] Furthermore, the outer diameter of the ball bearing 36 (outer race 36b) is set to D2 (see FIG. 9), and this outer diameter D2 is larger than the outer diameter D1 of the rotor 33 (D2>D1).

[0027] A sensor magnet SM is attached between the worm 35 and the ball bearing 36 in the axial direction of the rotating shaft 34. This sensor magnet SM is used to control the rotation direction and rotation speed of the rotating shaft 34. The ball bearing 36 is disposed between the sensor magnet SM and the core body 33a in the axial direction of the rotating shaft 34.

[0028] [Bearing support member] Furthermore, as shown in Figures 4, 5, and 7, the electric motor unit 30 is equipped with a bearing support member 37. The bearing support member 37 corresponds to the bearing support member of the present invention and is formed into a predetermined shape from a resin material such as plastic. The bearing support member 37 includes a support body 37a formed in a substantially flat plate shape and a plurality of mounting wall portions 37b that are inserted into and fitted into the housing 41. In other words, the bearing support member 37 is attached to the housing 41.

[0029] An annular support portion 37c is provided on the support body 37a of the bearing support member 37. This annular support portion 37c has an annular flat surface 37d facing one axial side (the right side in FIGS. 4 and 5) of the rotating shaft 34, and the annular flat surface 37d contacts the outer race 36b of the ball bearing 36 from the other axial side (the right side in FIGS. 4 and 5). In other words, the annular support portion 37c axially supports the entire circumference of the other axial side of the outer race 36b. Note that one axial side (the left side in FIGS. 4 and 5) of the outer race 36b is supported axially by a bearing mounting portion 50 provided on the housing 41.

[0030] In this way, the outer race 36b of the ball bearing 36 is sandwiched between the housing 41 and the bearing support member 37 in the axial direction of the rotating shaft 34. Here, the bearing support member 37 is fixed without rattle inside the housing 41 by fixing the yoke 31 to the housing 41 with the first and second fastening screws S1 and S2. In other words, the bearing support member 37 is sandwiched between the outer race 36b and the yoke 31 in the axial direction of the rotating shaft 34.

[0031] A pair of positioning protrusions 37e are integrally formed on the annular support portion 37c. These positioning protrusions 37e are arranged to face each other on the annular support portion 37c and protrude from the annular support portion 37c to one axial direction. The outer race 36b of the ball bearing 36 fits between the pair of positioning protrusions 37e. This makes it possible to accurately align (center) the axis of the ball bearing 36 with the axis of the annular support portion 37c when assembling the sunroof motor 20.

[0032] Thus, the pair of positioning protrusions 37e has the function of positioning the ball bearing 36 at a regular position with respect to the annular support portion 37c. Note that, as shown in FIG. 7, the support main body 37a is formed in a substantially rectangular shape when viewed axially. And the pair of positioning protrusions 37e is arranged in a relatively wide space of the support main body 37a. Therefore, by providing the pair of positioning protrusions 37e, the support main body 37a does not become larger in size.

[0033] Here, a through hole 37f penetrating in the axial direction of the annular support portion 37c is provided inside the annular support portion 37c in the radial direction. The inner diameter dimension of this through hole 37f is set to D3 (see FIG. 9), and the inner diameter dimension D3 of the through hole 37f is smaller than the outer diameter dimension D2 of the ball bearing 36 (D3 < D2). Therefore, the annular support portion 37c can contact the outer race 36b of the ball bearing 36 from its axial direction. On the other hand, the outer diameter dimension D1 of the rotor 33 is smaller than the inner diameter dimension D3 of the through hole 37f (D1 < D3).

[0034] Here, when arranging the dimensional relationships in descending order, they are the outer diameter dimension D2 of the ball bearing 36, the inner diameter dimension D3 of the through hole 37f, and the outer diameter dimension D1 of the rotor 33 (D2 > D3 > D1). Therefore, the rotor 33 can be inserted inside the through hole 37f, and the annular flat surface 37d can be brought into contact with the entire circumference on the other side in the axial direction of the outer race 36b from the axial direction. Therefore, as shown in FIG. 9, the sunroof motor 20 can be easily assembled. The assembly procedure of the sunroof motor 20 will be described in detail later.

[0035] Additionally, a total of three conductive members 38 (see the shaded portions in FIG. 7) are attached to the support body 37a. These conductive members 38 are formed into a generally rod-like shape from brass or other material with excellent conductivity, and one longitudinal side (the lower side in FIG. 7) is electrically connected to each of the three-phase coils CL (see FIGS. 4 and 5). Meanwhile, the other longitudinal side (the upper side in FIG. 7) of each conductive member 38 is electrically connectable to an external connector (not shown) provided on the vehicle 12 (see FIG. 1). As a result, a drive current is supplied from an on-board battery or the like to the three-phase coils CL of the sunroof motor 20, causing the rotary shaft 34 to rotate in the forward or reverse direction.

[0036] In this way, the bearing support member 37 has the function of supporting the ball bearing 36 as well as the function of holding a total of three conductive members 38.

[0037] [Deceleration mechanism section] 2 to 4, the speed reduction mechanism 40 includes a housing 41 that houses the speed reduction mechanism SD. The housing 41 is made of a resin material such as plastic and has a generally flat rectangular parallelepiped shape, and has a first wall 42, a second wall 43, and a third wall 44. Of the first, second, and third walls 42, 43, and 44, the first wall 42 occupies the largest proportion.

[0038] As shown in FIG. 4 , a worm wheel accommodating portion 45 is provided inside the housing 41. This worm wheel accommodating portion 45 is disposed in a portion close to the third wall portion 44. A worm wheel 46 that forms part of the speed reduction mechanism SD is rotatably accommodated inside the worm wheel accommodating portion 45. The worm wheel 46 is made of a resin material such as plastic to reduce its weight. The worm wheel 46 is provided with teeth 46a, which mesh with the worm 35 inside the housing 41.

[0039] That is, the speed reduction mechanism SD is a worm reducer that can obtain a relatively large reduction ratio. Specifically, in this embodiment, the speed reduction ratio of the speed reduction mechanism SD is [1:67]. That is, the speed reduction ratio is such that the worm wheel 46 makes one rotation after the worm 35 makes 67 rotations.

[0040] The axial base end of an output shaft 47 made of a round steel rod (made of metal) is fixed to the rotation center of the worm wheel 46. On the other hand, an output gear 47a (see FIG. 2) is integrally provided on the axial tip end of the output shaft 47, with which a pair of drive cables 17a, 17b (see FIG. 1) mesh.

[0041] Therefore, the high-speed rotation of the rotating shaft 34 is reduced by the reduction mechanism SD, and the reduced rotational force, which has been made high torque, is transmitted to the pair of drive cables 17a, 17b via the output shaft 47 and the output gear 47a. The reduction mechanism SD is formed by the worm 35 and the worm wheel 46.

[0042] Here, the worm wheel accommodating portion 45 has an opening (not shown) on the side opposite to the first wall portion 42. As shown in Fig. 3, the opening of the worm wheel accommodating portion 45 is closed by a cover member 48 formed by pressing a steel plate (metal) or the like.

[0043] The cover member 48 is formed in a generally disk shape, and a total of four insertion legs 48a are integrally formed on the outer periphery thereof. These insertion legs 48a extend toward the first wall portion 42 and, as shown in Fig. 4, are inserted into the insertion holes HL of the housing 41 in a locked state.

[0044] One longitudinal side (left side in FIG. 4) of the ground conductive member EC is electrically connected to one of these insertion legs 48a, and the other longitudinal side (right side in FIG. 4) of the ground conductive member EC is electrically connected to the yoke 31. This prevents electrical noise from being emitted from the axial base end side of the metallic output shaft 47 to the outside of the housing 41.

[0045] The "electrical noise" referred to here refers to high-frequency noise that is generated when the sunroof motor 20 is operating and that is propagated to metal (magnetic) parts provided inside the housing 41. If this electrical noise is radiated into the air or other external environment, it can adversely affect on-board equipment such as car audio. Therefore, the electrical noise generated by the sunroof motor 20 should be grounded (discharged) to the vehicle body (not shown) of the vehicle 12 (see FIG. 1) as much as possible. The yoke 31 is electrically connected to the vehicle body via a metal motor bracket (not shown).

[0046] 4, a worm accommodating portion 49 is provided inside the housing 41. This worm accommodating portion 49 is disposed in a portion closer to the second wall portion 43. The worm accommodating portion 49 is disposed near the worm wheel accommodating portion 45, and the interiors of these accommodating portions 49, 45 communicate with each other near the meshing portion between the worm 35 and the tooth portion 46a.

[0047] The worm accommodating portion 49 extends in the axial direction of the rotating shaft 34, and a second metal BR2 that rotatably supports the axial tip side of the rotating shaft 34 is accommodated on one axial side of the worm accommodating portion 49 (the left side in Figure 4).

[0048] Furthermore, a bearing mounting portion 50 is provided inside the housing 41. This bearing mounting portion is located on the other axial side (the right side in FIG. 4) of the worm accommodating portion 49, and is open toward the yoke 31. The ball bearing 36 is accommodated inside the bearing mounting portion 50, and one axial side (the left side in FIG. 4) of the outer race 36b of the ball bearing 36 is supported axially over its entire circumference by the bearing mounting portion 50.

[0049] A generally cylindrical bearing support ring RG is press-fitted into the bearing mounting portion 50. The bearing support ring RG is made of, for example, a sintered material formed by compressing metal powder. The outer race 36b of the ball bearing 36 is disposed radially inward of the bearing support ring RG, with a small gap (not shown) between them.

[0050] 4, the axial base end side (right side in FIG. 4) of the rotating shaft 34 is rotatably supported by a first metal BR1 attached to the bottom wall portion 31b of the yoke 31. The axial tip end side (left side in FIG. 4) of the rotating shaft 34 is rotatably supported by a second metal BR2 attached to the worm accommodating portion 49 of the housing 41. Furthermore, the axial middle portion of the rotating shaft 34 is rotatably supported by a ball bearing 36 housed in a bearing mounting portion 50.

[0051] That is, the rotating shaft 34 is supported at three points by three bearings (the first metal BR1, the second metal BR2, and the ball bearing 36). This prevents the worm 35 from separating from the teeth 46a of the worm wheel 46 (disengagement of meshing) when the sunroof motor 20 is operating, ensuring reliable meshing.

[0052] An inner race 36a of a ball bearing 36 is fixed to the rotating shaft 34, and an outer race 36b of the ball bearing 36 is sandwiched between the bearing mounting portion 50 and the bearing support member 37. Therefore, the rotating shaft 34 does not move in the axial direction. This eliminates the need to provide thrust bearings on both axial sides of the rotating shaft 34, thereby enabling a reduction in the number of parts.

[0053] On the other hand, to support the rotating shaft 34 at three points so that it can rotate smoothly, it is necessary to improve the precision of the components that make up the sunroof motor 20. However, improving the precision of such components is not practical because it would complicate the manufacturing process and increase product costs. For this reason, in this embodiment, a ball bearing 36 (outer race 36b) is arranged radially inside the bearing support ring RG with a small gap therebetween.

[0054] This allows the minute gap to absorb manufacturing errors of the parts and absorb differences in linear expansion between the parts, enabling smooth rotation of the rotating shaft 34. In this way, the minute gap formed between the bearing support ring RG and the outer race 36b has the function of absorbing manufacturing errors of the parts that make up the sunroof motor 20 and differences in linear expansion between the parts.

[0055] 5, 8, and 9, a motor accommodating section 51 formed in a generally box shape is provided inside the housing 41. This motor accommodating section 51 is disposed on the yoke 31 side of the bearing mounting section 50 in the axial direction of the rotating shaft 34 (on the right side in FIG. 5).

[0056] A part of the electric motor section 30 is housed in the motor housing section 51. Specifically, as shown in Fig. 5, the mounting wall section 37b of the bearing support member 37 that forms the electric motor section 30 is housed in the motor housing section 51 without rattle.

[0057] [Metal Jacket] 2 to 5, a metal jacket 60 is attached to the outer portion of the sunroof motor 20. This metal jacket 60 has the function of preventing electrical noise generated inside the sunroof motor 20 from radiating outside the housing 41. Specifically, the metal jacket 60 has the function of capturing electrical noise that attempts to escape around the housing 41 made of a resin material and dissipating it to the vehicle body via the yoke 31.

[0058] The metal jacket 60 includes a first conductive plate 61 and a second conductive plate 62. These first and second conductive plates 61, 62 are each formed into a predetermined shape by pressing a thin steel plate (magnetic body) made of a material with excellent conductivity. The first and second conductive plates 61, 62 are electrically connected to each other so that they can be electrically conductive to each other.

[0059] The first conductive plate 61 partially covers, in the radial direction of the rotating shaft 34, the portions of the three-phase coils CL that protrude from the yoke 31 (portions that enter the housing 41) and a total of three conductive members 38. Therefore, the first conductive plate 61 receives electrical noise that attempts to radiate to the outside from the portions of the three-phase coils CL and the portions of the three conductive members 38.

[0060] The second conductive plate 62 partially covers the portions of the three-phase coils CL that protrude from the yoke 31 (portions that enter the housing 41) and the rotating shaft 34 (worm 35) in the radial direction of the rotating shaft 34. Therefore, the second conductive plate 62 receives electrical noise that attempts to radiate to the outside from the portions of the three-phase coils CL and the portion of the rotating shaft 34 (worm 35).

[0061] Therefore, electrical noise that attempts to radiate outside the housing 41 is received by the metal jacket 60 (first and second conductive plates 61, 62) and then released (grounded) to the vehicle body via the yoke 31.

[0062] Next, the assembly procedure (1) and assembly procedure (2) of the sunroof motor 20 formed as above, in particular the procedure for mounting the electric motor unit 30 to the housing 41, will be described in detail with reference to the drawings.

[0063] [Assembly Procedure (1)] 8, first, the housing 41, the second metal BR2, the bearing support ring RG, and the rotor assembly RA are prepared. Here, the rotor assembly RA refers to the assembly in which the sensor magnet SM, the ball bearing 36, the core body 33a, a total of four permanent magnets MG, and the magnet holder 33b are assembled to the rotating shaft 34 on which the worm 35 is formed.

[0064] Then, first, the second metal BR1 is attached to the worm accommodating portion 49 along the dashed line. Next, the bearing support ring RG is attached to the bearing attachment portion 50. After that, the worm 35 side of the rotor assembly RA in the axial direction is brought into contact with the motor accommodating portion 51. Then, the worm 35 of the rotor assembly RA is housed in the worm accommodating portion 49, and the ball bearing 36 is attached to the bearing attachment portion 50.

[0065] At this time, the axial tip side of the rotating shaft 34 is rotatably supported by the second metal BR2, and the outer race 36b of the ball bearing 36 is inserted into the bearing support ring RG. Note that a minute gap (not shown) is provided between the outer race 36b and the bearing support ring RG, which makes it easy to mount the rotor assembly RA into the housing 41.

[0066] This completes the installation of the rotor assembly RA into the housing 41. Here, the housing 41 to which the rotor assembly RA has been installed (assembled) through assembly procedure (1) is referred to as the housing sub-assembly SA. Note that the total of four permanent magnets MG are magnetized in advance by a magnetizing device (not shown) before the rotor 33 is assembled into the housing 41.

[0067] [Assembly Procedure (2)] Next, as shown in FIG. 9, prepare the housing sub-assembly SA, the bearing support member 37, the motor sub-assembly MA, and the first and second fastening screws S1 and S2. Here, as shown in FIG. 7, a total of three conductive members 38 are attached to the bearing support member 37. Also, the motor sub-assembly MA refers to one in which the first metal BR1 is attached to the bottom wall portion 31b of the yoke 31 and the stator 32 is fixed to the side wall portion 31a of the yoke 31.

[0068] Then, along the dashed line, first, make the side of the bearing support member 37 where the conductive member 38 protrudes face the motor housing portion 51. Next, fit a plurality of mounting wall portions 37b provided on the bearing support member 37 into the motor housing portion 51. At this time, since the outer diameter dimension D1 of the rotor 33 is smaller than the inner diameter dimension D3 of the through hole 37f of the annular support portion 37c (D1 < D3), the rotor 33 can be easily inserted radially inward of the through hole 37f.

[0069] After that, the outer race 36b of the ball bearing 36 enters between a pair of positioning protrusions 37e provided on the bearing support member 37. And since the inner diameter dimension D3 of the through hole 37f is smaller than the outer diameter dimension D2 of the outer race 36b (D3 < D2), the entire circumference of the annular flat surface 37d in the annular support portion 37c abuts against the other axial side of the outer race 36b from the axial direction.

[0070] In this way, the entire circumference of one axial side (the left side in FIG. 9) of the outer race 36b is supported axially by the bearing mounting portion 50, and the entire circumference of the other axial side (the right side in FIG. 9) of the outer race 36b is supported axially by the annular flat surface 37d of the annular support portion 37c. Therefore, it is possible to suppress the ball bearing 36 (rotating shaft 34) from tilting.

[0071] Next, the motor sub-assembly MA is placed facing the motor accommodating portion 51. At this time, the side of the yoke 31 from which the three-phase coils CL protrude faces the motor accommodating portion 51. Then, while inserting the rotor 33 radially inside the stator 32, the opening side of the yoke 31 is brought into contact with the housing 41. At this time, the axial base end side of the rotating shaft 34 is rotatably supported by the first metal BR1.

[0072] Thereafter, using a fastening tool (not shown) such as a Phillips head screwdriver, the first fastening screw S1 and the second fastening screw S2 are screwed into the housing 41. This causes the yoke 31 and the housing 41 to be firmly fixed to each other.

[0073] After the rotor 33 is assembled to the housing 41 in this way, the bearing support member 37 and the stator 32 are assembled to the housing 41, completing the work of attaching the bearing support member 37 and the motor sub-assembly MA to the housing sub-assembly SA. After the assembly procedure (2) is completed, the worm wheel 46 (see FIG. 2) is accommodated in the worm wheel accommodating portion 45 of the housing 41, and the opening of the worm wheel accommodating portion 45 is closed with the cover member 48 (see FIG. 3). This completes the assembly work of the sunroof motor 20.

[0074] As described above in detail, according to this embodiment, the bearing support member 37, which is attached to the housing 41 and supports the other axial side of the ball bearing 36 (outer race 36b), includes the annular support portion 37c (annular flat surface 37d) that axially supports the entire circumference of the other axial side of the ball bearing 36 (outer race 36b), and therefore it is possible to prevent the ball bearing 36 from tilting relative to the housing 41 when a lateral force acts on the rotating shaft 34. This improves the fixing strength of the ball bearing 36 to the housing 41, and ultimately makes it possible to prevent rattling of the reduction gear mechanism SD.

[0075] Also, according to this embodiment, the electric motor unit 30 has a rotor 33 with a rotating shaft 34 fixed at the center of rotation. The rotor 33 is provided side by side with a ball bearing 36, and the outer diameter dimension D1 of the rotor 33 is smaller than the inner diameter dimension D3 of the annular support portion 37c (through hole 37f) (D1 < D3). Therefore, when assembling the sunroof motor 20, the rotor 33 can be easily inserted inside the annular support portion 37c (through hole 37f) in the radial direction. Thus, the assembly property of the sunroof motor 20 can be improved.

[0076] Furthermore, according to this embodiment, the electric motor unit 30 includes a yoke 31 that rotatably houses the rotating shaft 34, and the bearing support member 37 is sandwiched between the ball bearing 36 and the yoke 31 in the axial direction of the rotating shaft 34. Therefore, by simply fixing the yoke 31 to the housing 41, the ball bearing 36 can be fixed (supported) via the bearing support member 37 so as not to rattle.

[0077] Also, according to this embodiment, since the rattling of the speed reduction mechanism SD is suppressed as described above, the sunroof motor 20 can have an extended service life and its assembly property can be improved. Thus, it is possible to save manufacturing energy, and thereby achieve particularly Goal 7 (Ensure access for all people to affordable, reliable and sustainable modern energy) and Goal 13 (Take urgent measures to combat climate change and its impacts) among the Sustainable Development Goals (SDGs) defined by the United Nations.

[0078] Needless to say, the present invention is not limited to the above embodiment and can be variously modified without departing from the gist thereof. In the above embodiment, the present invention is shown as applied to the sunroof motor 20 used in the sunroof device 10 of the vehicle 12, but the present invention is not limited to this, and for example, it can also be applied to in-vehicle motors (motor devices) used in slide door devices, power window devices, wiper devices, etc. mounted on vehicles.

[0079] Furthermore, the material, shape, size, number, installation location, etc. of each component in the above-described embodiments are arbitrary as long as they can achieve the present invention, and are not limited to the above-described embodiments. [Explanation of symbols]

[0080] 10: Sunroof device, 11: Roof panel, 12: Vehicle, 13: Roof, 14: Opening, 15a, 15b: Shoe, 16: Guide rail, 17a, 17b: Drive cable, 20: Sunroof motor (motor device), 30: Electric motor section (motor), 31: Yoke (motor case), 31a: Side wall section, 31b: Bottom wall section, 32: Stator, 32a: Stator core, 32b: Teeth, 33: Rotor, 33a: Core body, 33b: Magnet holder, 34: Rotating shaft, 35: Worm, 36: Ball bearing (bearing member), 36a: Inner race, 36b: Outer race, 37: Bearing support member (bearing support member), 37a: Support body, 37b: Mounting wall section, 37c: Annular support section, 37d: Annular flat surface, 37e: Positioning protrusion, 37f: Through hole, 38: Conductive member, 40 : Reduction mechanism section, 41: Housing, 42: First wall section, 43: Second wall section, 44: Third wall section, 45: Worm wheel housing section, 46: Worm wheel, 46a: Tooth section, 47: Output shaft, 47a: Output gear, 48: Cover member, 48a: Insertion leg, 49: Worm housing section, 50: Bearing mounting section, 51: Motor housing section, 60: Metal jacket, 61: First conductive plate, 62: Second conductive plate, AG: Gap, BR1: First metal, BR2: Second metal, CL: Coil, EC: Grounding conductive member, FG: Windshield, HL: Insertion hole, MA: Motor sub-assembly, MG: Permanent magnet, RA: Rotor assembly, RG: Bearing support ring, S1: First fastening screw, S2: Second fastening screw, SA: Housing sub-assembly, SD: Reduction mechanism, SM: Sensor magnet

Claims

1. a motor having a rotating shaft; a speed reduction mechanism that reduces the rotation speed of the rotary shaft; A motor device comprising: a bearing member that rotatably supports the rotary shaft; a housing that accommodates the reduction mechanism and supports one axial side of the bearing member from the axial direction; a bearing support member attached to the housing and supporting the other axial side of the bearing member from the axial direction; and the bearing support member includes an annular support portion that supports the entire circumference of the bearing member on the other axial side thereof in the axial direction, The annular support portion has: a pair of positioning protrusions are provided on one axial side of the annular support portion, and the pair of positioning protrusions aligns the axis of the bearing member with the axis of the annular support portion; Motor device.

2. 2. The motor device according to claim 1, the motor has a rotor whose rotation center is fixed to the rotation shaft, The rotor is provided next to the bearing member, The outer diameter of the rotor is smaller than the inner diameter of the annular support portion. Motor device.

3. 3. The motor device according to claim 1, the motor includes a motor case that rotatably houses the rotary shaft, the bearing support member is sandwiched between the bearing member and the motor case in the axial direction of the rotating shaft; Motor device.

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