Motor device

Abstract

To provide a motor device that can further suppress adverse effects on on-vehicle equipment (car audio system, etc.) by providing more sufficient countermeasures against electrical noise.SOLUTION: Since a motor device has a first conductive plate 61 and a second conductive plate 62 provided to cover a housing 41, electrical noise can be prevented from being radiated to the outside of the housing 41, and as a result, countermeasures against electric noise can be made more sufficient. Therefore, it is possible to suppress adverse effects on on-vehicle equipment such as a car audio system. In addition, since first and second fixing members 42a, 42b electrically connect and fix the first and second conductive plates 61, 62 together, the ease of assembly of the sunroof motor 20 can be improved.SELECTED DRAWING: Figure 2

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 vehicle motors used as drive sources for sunroof devices and the like. This makes it possible to easily install the motor device in the narrow space inside the roof of a vehicle. Such a motor device is described, for example, in Patent Document 1.

[0003] The motor device described in Patent Document 1 includes a brushed motor with a rotating shaft that is rotated by the supply of a driving current, and a reduction mechanism that decelerates the rotation of the rotating shaft to increase the torque and outputs the increased torque to the outside.

[0004] In addition, a ground terminal is provided near the brushes that form the motor, which allows electrical noise radiated from the brushes to escape to the ground via the ground terminal, thereby preventing electrical noise from radiating around the motor device and thereby preventing it from adversely affecting car audio, on-board controllers, etc. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-053803 Summary of the Invention [Problem to be solved by the invention]

[0006] However, in the motor device described in Patent Document 1, a worm is housed rotatably inside a resin casing, and if the worm is made of metal, there is a risk that electrical noise will propagate through the worm and be radiated from the worm to the outside of the casing. In other words, the motor device described in Patent Document 1 does not provide sufficient countermeasures against electrical noise.

[0007] An object of the present invention is to provide a motor device that provides more sufficient countermeasures against electrical noise and can further reduce adverse effects on in-vehicle equipment (such as car audio). [Means for solving the problem]

[0008] In one aspect of the present invention, and a yoke that accommodates a stator wound with a coil. A motor device comprising a motor, a speed reduction mechanism that reduces the rotation of the rotating shaft, and a housing that accommodates the speed reduction mechanism, and a cover that covers the housing to prevent electrical noise from radiating outside the housing. The first conductive plate and the second conductive plate Conductive Plate the first conductive plate is fixed to the housing by a fastening member that fixes the yoke to the housing and is electrically connected to the yoke, and the second conductive plate is The housing is provided with can Fixing member and fixed to the housing together with the first conductive member by the are. [Effects of the Invention]

[0009] According to the present invention, by providing a plurality of conductive plates so as to cover the housing, it is possible to prevent electrical noise from radiating outside the housing, thereby providing more effective countermeasures against electrical noise. This makes it possible to further suppress adverse effects on in-vehicle equipment such as car audio. Furthermore, since the plurality of conductive plates are electrically connected to each other and fixed together by the fixing member, it is also possible to improve the ease of assembly of the motor device. [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 a partial cross-sectional view taken along line AA in FIG. 4, with the interior omitted. [Figure 6] 4 is a perspective view illustrating the positional relationship between an electric motor section and first and second conductive plates. FIG. [Figure 7] FIG. 5 is a partially enlarged cross-sectional view taken along line BB in FIG. 4. [Figure 8] 10A to 10C are perspective views showing a procedure for attaching the first conductive plate to the gear case. [Figure 9] 10A to 10C are perspective views showing a procedure for attaching the second conductive plate to the gear case. [Figure 10] FIG. 10 is a partially enlarged perspective view showing a second embodiment and corresponding to FIG. 2. [Figure 11] FIG. 8 is a partially enlarged cross-sectional view showing the second embodiment and corresponding to FIG. 7. [Figure 12] FIG. 6 is a partial cross-sectional view showing a third embodiment and corresponding to FIG. 5. DETAILED DESCRIPTION OF THE INVENTION

[0011] [Embodiment 1] Hereinafter, the first 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 the sunroof motor, Figure 4 is a cross-sectional view of the sunroof motor along the axial direction of the rotating shaft, Figure 5 is a partial cross-sectional view along line AA in Figure 4 with the interior omitted, Figure 6 is an oblique view explaining the positional relationship between the electric motor section and the first and second conductive plates, Figure 7 is a partially enlarged cross-sectional view along line BB in Figure 4, Figure 8 is an oblique view showing the procedure for attaching the first conductive plate to the gear case, and Figure 9 is an oblique view showing the procedure for attaching the second conductive plate to the gear case.

[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 vehicle 12 than the opening 14 and between the opening 14 and the windshield FG. The other ends of the pair of drive cables 17a, 17b are engaged with an output gear 47a (see FIG. 2) 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 and integrated (unitized) by a pair of first and second fastening screws S1 and S2. Here, the first fastening screw S1 corresponds to the fastening member in the present invention.

[0017] [Electric motor] The electric motor section 30 is a brushless motor, i.e., a motor without brushes, and has a yoke 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 left side in FIG. 2, and the right side in FIGS. 3 and 4) is closed by a stepped bottom wall section 31b.

[0018] [stator] As shown in Fig. 4, 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). 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 (only two are shown in the figure) 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] A rotating shaft 34 is fixed by press-fitting to the radially inner side of the core body 33a. The rotating shaft 34 is made of a round steel bar (magnetic material) to ensure sufficient strength. The axial base end side (right side in FIG. 4) of the rotating shaft 34 is disposed 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 disposed inside the housing 41 that forms the reduction mechanism 40 and rotatably supported by a second metal (radial bearing) BR2 attached to the worm accommodating portion 49 of the housing 41.

[0022] 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.

[0023] Furthermore, a ball bearing 36 is provided in the axially intermediate portion of the rotating shaft 34. Specifically, the ball bearing 36 includes an inner race (inner ring) 36a made of steel and formed into a generally cylindrical shape, and an outer race (outer ring) 36b that is also made of steel and formed into a generally cylindrical shape like the inner race 36a but has 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.

[0024] 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.

[0025] 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.

[0026] [Bearing support member] 4, the electric motor unit 30 further includes a bearing support member 37. The bearing support member 37 is made of a resin material such as plastic, and includes a support body 37a formed in a substantially annular shape, and a mounting wall portion 37b that is inserted into and fitted into the housing 41.

[0027] The support body 37a of the bearing support member 37 supports the outer race 36b of the ball bearing 36 from the axial base end side (right side in FIG. 4) of the rotating shaft 34. The axial tip side of the outer race 36b of the rotating shaft 34 (left side in FIG. 4) is supported by a bearing mounting portion 50 provided on the housing 41.

[0028] 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 housing 41 and the yoke 31.

[0029] Additionally, a total of three conductive members (terminal members) 38 are attached to the bearing support member 37 (see FIG. 6). 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 right side in FIG. 6) is electrically connected to the U-phase, V-phase, and W-phase (three-phase) coils CL, respectively. Meanwhile, the other longitudinal side (the left side in FIG. 6) 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 rotating shaft 34 to rotate in the forward or reverse direction.

[0030] Thus, 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. Here, in Fig. 6, the ball bearing 36 and sensor magnet SM fixed to the rotating shaft 34, the bearing support member 37 that holds a total of three conductive members 38, and the yoke 31 are not shown.

[0031] [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.

[0032] Here, if the axial direction of the rotation shaft 34 is defined as the X-axis direction, the axial direction of the output shaft 47 perpendicular to the rotation shaft 34 is defined as the Y-axis direction, and the direction perpendicular to both the rotation shaft 34 and the output shaft 47 is defined as the Z-axis direction, the first wall 42 is disposed on one side of the housing 41 in the Y-axis direction (the front side in FIG. 2 and the back side in FIGS. 3 and 4), the second wall 43 is disposed on one side of the housing 41 in the Z-axis direction (the upper side in FIGS. 2 to 4), and the third wall 44 is disposed on the other side of the housing 41 in the Z-axis direction (the lower side in FIGS. 2 to 4). The second and third wall portions 43, 44 all stand perpendicular to the first wall portion 42.

[0033] 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 on the other side in the Z axis direction, i.e., near the third wall portion 44. A worm wheel 46 that forms 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 that mesh with the worm 35 inside the housing 41.

[0034] 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.

[0035] An output shaft 47 made of a round steel rod (magnetic material) has its axial base end (the other side in the Y-axis direction) fixed to the rotation center of the worm wheel 46. On the other hand, an output gear 47a is integrally provided on the axial tip end (one side in the Y-axis direction) of the output shaft 47, with which a pair of drive cables 17a, 17b (see FIG. 1) mesh.

[0036] 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.

[0037] Here, the worm wheel accommodating section 45 is open on the other side in the Y-axis direction, i.e., the side opposite to the first wall section 42 in the Y-axis direction (not shown), and the opening portion of the worm wheel accommodating section 45 is closed by a cover member 48 (see Figure 3) formed by pressing a steel plate (magnetic material) or the like.

[0038] 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 one side in the Y-axis direction and, as shown in Fig. 4, are inserted into insertion holes HL of the housing 41 in a locked state.

[0039] 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 radiating from the axial base end side of the output shaft 47 to the outside of the housing 41.

[0040] 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 components (magnetic materials) 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 earthed (discharged) to the vehicle body (not shown) of the vehicle 12 as much as possible. The yoke 31 is electrically connected to the vehicle body via a metal motor bracket (not shown).

[0041] 4, a worm accommodating portion 49 is provided inside the housing 41. This worm accommodating portion 49 is disposed on one side in the Z axis direction, that is, 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.

[0042] The worm accommodating portion 49 extends in the axial direction of the rotating shaft 34 (the left-right direction in Figure 4 along the X-axis direction), and a second metal BR2 that rotatably supports the axial tip side of the rotating shaft 34 is accommodated on one side of the worm accommodating portion 49 in the X-axis direction (the left side in Figure 4).

[0043] Furthermore, a bearing mounting portion 50 is provided inside the housing 41. This bearing mounting portion 50 is located on the other side of the worm accommodating portion 49 in the X axis direction (the right side in FIG. 4), and is open toward the yoke 31. A ball bearing 36 is accommodated inside the bearing mounting portion 50, and the tip side of the outer race 36b of the ball bearing 36 in the axial direction of the rotating shaft 34 (one side in the X axis direction, the left side in FIG. 4) is supported by the bearing mounting portion 50.

[0044] 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.

[0045] 4, the base end side of the rotating shaft 34 in the axial direction (the other side in the X-axis direction, and the right side in FIG. 4) is rotatably supported by a first metal BR1 attached to the bottom wall portion 31b of the yoke 31. Furthermore, the tip end side of the rotating shaft 34 in the axial direction (one side in the X-axis direction, and the left side in FIG. 4) is rotatably supported by a second metal BR2 attached to the worm accommodating portion 49 of the housing 41. Furthermore, an intermediate portion of the rotating shaft 34 in the axial direction is rotatably supported by a ball bearing 36 housed in a bearing mounting portion 50.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 4 and 5, a motor accommodating section 51 is provided inside the housing 41. This motor accommodating section 51 is arranged on the yoke 31 side (the other side in the X-axis direction) of the bearing mounting section 50 in the axial direction of the rotating shaft 34. Note that in FIG. 5, in order to make the shape of the motor accommodating section 51 easier to understand, the detailed structure of its interior is not shown.

[0051] A part of the electric motor section 30 is housed in the motor housing section 51. Specifically, as shown in Fig. 4, 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.

[0052] 5, the motor accommodating section 51 includes a first accommodating wall 51a, a second accommodating wall 51b, a third accommodating wall 51c, and a fourth accommodating wall 51d. The motor accommodating section 51 is formed into a box shape with a substantially rectangular cross section by these accommodating walls 51a, 51b, 51c, and 51d.

[0053] Specifically, the first storage wall 51a forms a surface that extends in the X-axis direction and the Z-axis direction, similar to the first wall portion 42 (see FIG. 8). The second storage wall 51b forms a surface that extends in the X-axis direction and the Y-axis direction, similar to the second wall portion 43 (see FIG. 8). The third storage wall 51c is disposed on the opposite side from the first wall portion 42 in the Y-axis direction. The fourth storage wall 51d is disposed between the second wall portion 43 and the third wall portion 44 in the Z-axis direction.

[0054] 5, a first screw hole H1 extending in the X-axis direction is provided at the connection portion (upper left corner of FIG. 5) between the second storage wall 51b and the third storage wall 51c, and the first fastening screw S1 (see FIG. 2) is screwed into the first screw hole H1. Also, a second screw hole H2 extending in the X-axis direction is provided at the connection portion (lower right corner of FIG. 5) between the fourth storage wall 51d and the first storage wall 51a, and the second fastening screw S2 (see FIG. 2) is screwed into the second screw hole H2.

[0055] [Metal Jacket] 2 to 9, 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 receiving 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.

[0056] The metal jacket 60 is made up of a plurality of conductive plates, specifically 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. Here, in Figures 2, 3, 6, 8, and 9, the first and second conductive plates 61, 62 are shaded to make the shapes of the first and second conductive plates 61, 62 easier to understand.

[0057] [First conductive plate] 8, the first conductive plate (conductive plate) 61 includes a first covering portion 61a that covers the second wall portion 43 of the housing 41, a second covering portion 61b that covers the other side in the Y-axis direction of the second accommodating wall 51b (the left side in FIG. 5), and a third covering portion 61c that covers the third accommodating wall 51c (see FIG. 5). The first covering portion 61a and the second covering portion 61b are connected to each other so as to be aligned in a stepped manner in the X-axis direction.

[0058] Furthermore, a first fixing portion 61d is integrally provided on one side in the Y axis direction of the first covering portion 61a (the lower right side in FIG. 8) so as to protrude toward the other side in the Z axis direction (the lower side in FIG. 8). This first fixing portion 61d is fixed to the housing 41 by first and second fixing members 42a and 42b provided on the first wall portion 42 of the housing 41. Specifically, the first fixing portion 61d is provided with a pair of cutout grooves G that open to the other side in the Z axis direction and into which the first and second fixing members 42a and 42b are respectively inserted.

[0059] Here, the first and second fixing members 42a, 42b provided on the first wall portion 42 are formed in a substantially cylindrical shape and protrude at a predetermined height toward one side in the Y-axis direction. These first and second fixing members 42a, 42b correspond to the fixing members in the present invention, and are designed to melt and deform when pressed against a heating tool TL shown in Figures 7 and 9.

[0060] Furthermore, a second fixing portion 61e is integrally provided on one side in the X axis direction of the second covering portion 61b (the lower left side in FIG. 8) so as to protrude to the other side in the Z axis direction. This second fixing portion 61e is a portion that is fixed to the housing 41 together with the yoke 31 by a first fastening screw S1. The second fixing portion 61e is provided with a screw hole HA through which the first fastening screw S1 is inserted. In other words, the first conductive plate 61 is fixed to the housing 41 by the first fastening screw S1 that fixes the yoke 31 to the housing 41.

[0061] In this way, the first conductive plate 61 is fixed to the housing 41 at a total of three locations: the first and second fixing members 42a, 42b and the first fastening screw S1, and the first conductive plate 61 is electrically connected to the yoke 31 via the second fixing portion 61e.

[0062] The third covering portion 61c is integrally provided on the other side of the second covering portion 61b in the Y-axis direction (the upper left side in FIG. 8) and extends toward the other side in the Z-axis direction. Specifically, the third covering portion 61c is bent at a substantially right angle (approximately 90°) to the second covering portion 61b, and the third covering portion 61c is cantilevered relative to the second covering portion 61b. However, the angle formed between the third covering portion 61c and the second covering portion 61b may be less than a right angle (90° or less). In this case, the third covering portion 61c can be pressed against the third housing wall 51c, thereby making it possible to reliably prevent the third covering portion 61c from rattling.

[0063] 6, the first conductive plate 61 covers the portions of the three-phase coils CL that protrude from the yoke 31 (portions that enter the housing 41) in the radial direction of the rotating shaft 34. The first conductive plate 61 also partially covers a total of three conductive members 38 in the radial direction of the rotating shaft 34. This allows the first conductive plate 61 to receive electrical noise that attempts to radiate to the outside from the portions of the three-phase coils CL and the portions of the total of three conductive members 38.

[0064] [Second conductive plate] 9, the second conductive plate (conductive plate) 62 includes a fourth covering portion 62a that covers the first wall portion 42 of the housing 41, a fifth covering portion 62b that covers the first accommodating wall 51a, and a sixth covering portion 62c that covers one side in the Y-axis direction (the right side in FIG. 5) of the second accommodating wall 51b. The fourth covering portion 62a and the fifth covering portion 62b are connected to each other so as to be aligned in a stepped manner in the X-axis direction.

[0065] Furthermore, a support portion 62d recessed in a stepped shape toward the first wall portion 42 is provided on the other side of the fourth covering portion 62a in the X-axis direction (the upper right side in FIG. 9). This support portion 62d is supported by a protrusion 42e provided on the first wall portion 42 of the housing 41. As a result, when the second conductive plate 62 is attached to the housing 41 (first wall portion 42), the fourth covering portion 62a is slightly warped. That is, the fourth covering portion 62a is elastically deformed by the protrusion 42e. Therefore, rattle of the tip side (support portion 62d side) of the fourth covering portion 62a is effectively suppressed.

[0066] Furthermore, a first insertion hole 62e and a second insertion hole 62f are provided on one side in the Z axis direction (upper side in FIG. 9) of the fourth covering portion 62a so as to be aligned in the X axis direction. The first fixing member 42a provided on the first wall portion 42 is inserted into the first insertion hole 62e, and the second fixing member 42b provided on the first wall portion 42 is inserted into the second insertion hole 62f.

[0067] Further, a third insertion hole 62g and a fourth insertion hole 62h are provided on the other side in the Z axis direction of the fourth covering portion 62a (the lower side in FIG. 9) so as to be aligned in the X axis direction. The third fixing member 42c and the fourth fixing member 42d provided on the first wall portion 42 are inserted into the third and fourth insertion holes 62g and 62h, respectively.

[0068] Here, the third and fourth fixing members 42c and 42d correspond to the second conductive plate fixing members of the present invention. That is, the third and fourth fixing members 42c and 42d are fixing members dedicated to the second conductive plate 62 for fixing the second conductive plate 62 to the housing 41 (first wall portion 42).

[0069] The third and fourth fixing members 42c, 42d are formed in a generally cylindrical shape, similar to the first and second fixing members 42a, 42b, and protrude a predetermined height toward one side in the Y-axis direction. These third and fourth fixing members 42c, 42d are also melted and deformed when pressed against a heating tool TL shown in Figures 7 and 9.

[0070] 5, when the rotating shaft 34 is viewed from the radial outside (the direction of arrow C), the first and second fixing members 42a and 42b are arranged on one side (one side in the Z axis direction) of the rotating shaft 34, and the third and fourth fixing members 42c and 42d are arranged on the other side (other side in the Z axis direction) of the rotating shaft 34. This makes it possible to fix the fourth covering portion 62a, which has a relatively long dimension in the X axis direction, to the first wall portion 42 without any rattle and to align it along the rotating shaft 34 (worm 35).

[0071] In this way, the second conductive plate 62 is fixed to the housing 41 at a total of four locations: the first and second fixing members 42a and 42b and the third and fourth fixing members 42c and 42d, and the second conductive plate 62 is electrically connected to the first conductive plate 61 at the portions of the first and second fixing members 42a and 42b. In other words, the first and second fixing members 42a and 42b electrically connect the first and second conductive plates 61 and 62, respectively, and have the function of fixing the first and second conductive plates 61 and 62 together to the housing 41 (first wall portion 42).

[0072] Therefore, the second conductive plate 62 is electrically connected to the yoke 31 via the first conductive plate 61. As shown in Fig. 6, the second conductive plate 62 covers the portions of the three-phase coil CL that protrude from the yoke 31 (portions that enter the housing 41) in the radial direction of the rotating shaft 34. The second conductive plate 62 also partially covers the rotating shaft 34 (worm 35) in the radial direction of the rotating shaft 34. As a result, electrical noise that attempts to radiate to the outside from the portions of the three-phase coil CL and the portion of the rotating shaft 34 (worm 35) is received by the second conductive plate 62.

[0073] In this way, the metal jacket 60 made up of the first and second conductive plates 61, 62 covers the metal (magnetic) parts through which electrical noise propagates, on the outer side of the housing 41 made of a resin material such as plastic. Therefore, electrical noise that attempts to radiate outside the housing 41 is received by the metal jacket 60 (the first and second conductive plates 61, 62) and is then released (grounded) to the vehicle body via the yoke 31.

[0074] [Assembly Instructions] Next, the procedure for assembling the sunroof motor 20 formed as above, in particular the procedure for attaching the metal jacket 60 (first and second conductive plates 61, 62) to the housing 41 will be described in detail with reference to the drawings.

[0075] First, as shown by arrow M1 in Fig. 8, the first conductive plate 61 is brought to face the second wall portion 43 of the housing 41. Specifically, the first covering portion 61a of the first conductive plate 61 faces the second wall portion 43 from one side in the Z axis direction (the upper side in Fig. 8), and the second covering portion 61b of the first conductive plate 61 faces the second accommodating wall 51b from one side in the Z axis direction.

[0076] As a result, the first covering portion 61a is attached to the second wall portion 43, and the second covering portion 61b is attached to the second housing wall 51b. Furthermore, the third covering portion 61c is attached to the third housing wall 51c (see FIG. 5). At this time, the first and second fixing members 42a, 42b respectively enter a pair of notched grooves G provided in the first fixing portion 61d of the first conductive plate 61. Furthermore, the screw hole HA provided in the second fixing portion 61e of the first conductive plate 61 faces the screw hole ha provided in the yoke 31, and they are arranged coaxially with each other.

[0077] Thereafter, as indicated by arrows M2 and M3 in Fig. 8, the first and second fastening screws S1 and S2 are screwed using a fastening tool (not shown) from one side in the X-axis direction (the lower left side in Fig. 8) into the first and second screw holes H1 and H2 (see Fig. 5) provided in the housing 41, respectively. As a result, the yoke 31 is fixed to the housing 41, and the first conductive plate 61 is electrically connected to the yoke 31, completing the temporary fixing of the first conductive plate 61 to the housing 41 by the first fastening screw S1.

[0078] Next, as shown by arrow M4 in Fig. 9, the second conductive plate 62 is brought to face the first wall portion 42 of the housing 41. Specifically, the fourth covering portion 62a of the second conductive plate 62 faces the first wall portion 42 from one side in the Y axis direction (the lower right side in Fig. 9), and the fifth covering portion 62b of the second conductive plate 62 faces the first accommodating wall 51a from one side in the Y axis direction.

[0079] As a result, the fourth covering portion 62a is attached to the first wall portion 42, and the fifth covering portion 62b is attached to the first housing wall 51a. Furthermore, the sixth covering portion 62c is attached to the second housing wall 51b. At this time, the first and second fixing members 42a and 42b are inserted into the first and second insertion holes 62e and 62f, respectively, provided in the fourth covering portion 62a of the second conductive plate 62. Furthermore, the third and fourth fixing members 42c and 42d are inserted into the third and fourth insertion holes 62g and 62h, respectively, provided in the fourth covering portion 62a of the second conductive plate 62. Furthermore, the support portion 62d of the fourth covering portion 62a abuts against the protrusion 42e of the housing 41.

[0080] 7 and 9, the tip of the heating tool TL is pressed against the tip of the first to fourth fixing members 42a to 42d to melt the tip of the first to fourth fixing members 42a to 42d. This deforms the tip of the first to fourth fixing members 42a to 42d and prevents them from coming out of the first to fourth insertion holes 62e to 62h. This completes the permanent fixing of the first and second conductive plates 61, 62 to the housing 41, and the first and second conductive plates 61, 62 are electrically connected to each other while the support portion 62d is in elastic contact with the protrusion 42e.

[0081] This completes the attachment of the metal jacket 60 (the first and second conductive plates 61, 62) to the housing 41.

[0082] As described above in detail, according to this embodiment, the first conductive plate 61 and the second conductive plate 62 are provided to cover the housing 41, thereby preventing electrical noise from radiating outside the housing 41 and providing more effective countermeasures against electrical noise. This further reduces adverse effects on in-vehicle devices such as car audio. Furthermore, the first and second conductive plates 61, 62 are electrically connected and fixed together by the first and second fixing members 42a, 42b, which also improves the ease of assembly of the sunroof motor 20.

[0083] Furthermore, according to this embodiment, the electric motor section 30 includes a total of three conductive members 38 that supply drive current to the three-phase coils CL and a worm 35 that forms the reduction mechanism SD, and the metal jacket 60 has a first conductive plate 61 and a second conductive plate 62, and in the radial direction of the rotating shaft 34, the first conductive plate 61 partially covers the three-phase coils CL and the total of three conductive members 38, and the second conductive plate 62 partially covers the three-phase coils CL and the worm 35.

[0084] As a result, electrical noise that attempts to radiate outside the housing 41 from the three-phase coil CL portion, the three conductive members 38 portion, and the worm 35 portion is received by the metal jacket 60, and most of the electrical noise can be released (earthed) to the vehicle body via the yoke 31.

[0085] Furthermore, according to this embodiment, the electric motor section 30 includes a yoke 31 that houses a stator 32 around which three-phase coils CL are wound, and the first conductive plate 61 is fixed to the housing 41 by a first fastening screw S1 that fixes the yoke 31 to the housing 41.

[0086] This ensures reliable electrical connection between the yoke 31 and the first conductive plate 61. Furthermore, since there is no need to separately fix the first conductive plate 61 using a separate fastening screw, it is possible to prevent an increase in the number of parts and complicated assembly.

[0087] Furthermore, according to this embodiment, when the rotating shaft 34 is viewed from the radially outside (the direction of arrow C in Figure 5), the first and second fixing members 42a, 42b are arranged on one side of the rotating shaft 34 (one side in the Z axis direction), and the third and fourth fixing members 42c, 42d, which are dedicated to the second conductive plate 62 and fix the second conductive plate 62 to the housing 41, are arranged on the other side of the rotating shaft 34 (the other side in the Z axis direction).

[0088] This allows the fourth covering portion 62a, which has a relatively long dimension in the X-axis direction (axial direction of the rotation shaft 34), to be fixed to the first wall portion 42 without rattle, and can be aligned with the rotation shaft 34 (worm 35).

[0089] Furthermore, according to this embodiment, as described above, an increase in the number of parts and complexity of assembly can be suppressed, thereby enabling reductions in manufacturing energy, thereby achieving the Sustainable Development Goals (SDGs) established by the United Nations, particularly Goal 7 (Ensure access to affordable, reliable, sustainable and modern energy for all) and Goal 13 (Take urgent action to combat climate change and its impacts).

[0090] [Embodiment 2] Next, a second embodiment of the present invention will be described in detail with reference to the drawings. Note that parts having the same functions as those in the first embodiment are given the same reference numerals, and detailed descriptions thereof will be omitted.

[0091] FIG. 10 is a partially enlarged perspective view corresponding to FIG. 2 showing the second embodiment, and FIG. 11 is a partially enlarged cross-sectional view corresponding to FIG. 7 showing the second embodiment.

[0092] As shown in Fig. 10, the second embodiment differs from the first embodiment only in the structure of the fixing members. Specifically, in the first embodiment, as shown in Figs. 7 and 9, a heating tool TL is used to crush and melt the tip portions of the first to fourth fixing members 42a to 42d, thereby finally fixing the first and second conductive plates 61, 62 to the housing 41. That is, the first embodiment employs a fixing structure based on thermal welding. In contrast, the second embodiment employs a fixing structure based on a push nut.

[0093] 10, in the second embodiment, first to fourth push nut portions PN1 to PN4 for a total of four shafts are provided instead of the first to fourth insertion holes 62e to 62h (see FIG. 9) in the first embodiment. Specifically, the first push nut portion PN1 is provided corresponding to the first fixed member 42a, the second push nut portion PN2 is provided corresponding to the second fixed member 42b, the third push nut portion PN3 is provided corresponding to the third fixed member 42c, and the fourth push nut portion PN4 is provided corresponding to the fourth fixed member 42d.

[0094] The first to fourth push nut portions PN1 to PN4 have a plurality of claws N inclined toward the axial tip ends of the first to fourth fixing members 42a to 42d on their inner circumferential portions. As a result, when the first to fourth push nut portions PN1 to PN4 are attached to the first to fourth fixing members 42a to 42d, the plurality of claws N bite into the first to fourth fixing members 42a to 42d, respectively. As a result, even if a force acts on the second conductive plate 62 in a direction to remove it from the housing 41, the second conductive plate 62 will not come off the housing 41.

[0095] In the second embodiment, the first and second push nut portions PN1 and PN2 and the first and second fixing members 42a and 42b correspond to the fixing members of the present invention, and the third and fourth push nuts PN3 and PN4 and the third and fourth fixing members 42c and 42d correspond to the second conductive plate fixing members of the present invention.

[0096] 11, the fourth covering portion 62a of the second conductive plate 62 is brought to face the first wall portion 42 of the housing 41 from one side in the Y axis direction (the right side in FIG. 11), and the first to fourth push nut portions PN1 to PN4 are attached to the first to fourth fixing members 42a to 42d, respectively. At this time, the second conductive plate 62 is oriented so that the multiple claws N are inclined to one side in the Y axis direction. In addition, the vicinity of the first to fourth push nut portions PN1 to PN4 of the second conductive plate 62 is pressed strongly toward the other side in the Y axis direction (the left side in FIG. 11) to prevent the second conductive plate 62 from rattling.

[0097] This completes the permanent fixing of the first and second conductive plates 61, 62 to the housing 41, and the first and second conductive plates 61, 62 are electrically connected to each other while the support portion 62d is in elastic contact with the protrusion 42e (see FIG. 9).

[0098] The second embodiment configured as described above also achieves the same effects as the first embodiment. In addition, in the second embodiment, there is no need to use the heat-generating tool TL (see FIGS. 7 and 9) when attaching the metal jacket 60 (first and second conductive plates 61, 62) to the housing 41, which improves assembly efficiency and enables further energy savings in manufacturing.

[0099] [Embodiment 3] Next, a third embodiment of the present invention will be described in detail with reference to the drawings. Note that parts having the same functions as those in the first embodiment are given the same reference numerals, and detailed descriptions thereof will be omitted.

[0100] FIG. 12 shows a partial cross-sectional view corresponding to FIG. 5 showing the third embodiment.

[0101] 12, the third embodiment differs from the first embodiment only in the structure for fixing the first conductive plate 61 to the housing 41. Specifically, in the first embodiment, the first conductive plate 61 is fixed at a total of three locations, namely, the first fastening screw S1, the first fixing member 42a, and the second fixing member 42b (see FIG. 2), but in the third embodiment, one more fixing location is added.

[0102] 12, an engaging protrusion 61f is integrally provided so as to protrude to one side in the Y axis direction (the right side in FIG. 12) on the tip side portion (the portion on the other side in the Z axis direction) of the third covering portion 61c of the first conductive plate 61. This engaging protrusion 61f is formed by folding back the tip side portion of the third covering portion 61c at a right angle (90°).

[0103] A hooking claw 61g is integrally provided on the tip end side of the engaging protrusion 61f (on one side in the Y-axis direction). The hooking claw 61g is folded back toward the base end side of the engaging protrusion 61f (on the other side in the Y-axis direction) and is hooked onto the engaging recess 51e of the housing 41 to prevent it from coming off.

[0104] The third accommodating wall 51c of the housing 41 has an engagement recess 51e into which the engagement protrusion 61f is inserted, and the engagement recess 51e is recessed to a predetermined depth on one side in the Y-axis direction. When the engagement protrusion 61f (gripping claw 61g) is inserted into the engagement recess 51e, the gripping claw 61g elastically contacts and bites into the inner wall of the engagement recess 51e. As a result, the gripping claw 61g is caught in the engagement recess 51e, and the third covering portion 61c of the first conductive plate 61 is prevented from coming off from the third accommodating wall 51c of the housing 41.

[0105] The third embodiment configured as described above also achieves the same effects as the first embodiment. In addition, in the third embodiment, the first conductive plate 61 is provided with the engaging protrusion 61f, and the engaging protrusion 61f is inserted into the engaging recess 51e provided in the housing 41, so that the first conductive plate 61 can be attached to the housing 41 without rattle. In particular, rattle at the tip end of the third covering portion 61c is effectively suppressed, which in turn makes it possible to further suppress the generation of abnormal noise from the sunroof motor 20.

[0106] The present invention is not limited to the above-described embodiments, and it goes without saying that various modifications can be made without departing from the spirit of the present invention. In the above-described embodiments, the present invention is 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 can also be applied to, for example, an in-vehicle motor (motor device) used in a sliding door device, a power window device, a wiper device, etc., mounted on the vehicle.

[0107] Furthermore, the material, shape, dimensions, number, installation location, etc. of each component in each of the above embodiments are arbitrary as long as they can achieve the present invention, and are not limited to the above embodiments. [Explanation of symbols]

[0108] 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, 31a: Side wall section, 31b: Bottom wall section, 32: Stator, 32a: Stator core, 32b: Teeth, 32c: Insulator, 33: Rotor, 33a: Core body, 33b: Magnet holder, 34: Rotating shaft, 35: Worm, 36: Ball bearing, 36a: Inner race, 36b: Outer race, 36c: ball, 37: bearing support member, 37a: support body, 37b: mounting wall portion, 38: conductive member (terminal member), 40: reduction mechanism portion, 41: housing, 42: first wall portion, 42a: first fixing member (fixing member), 42b: second fixing member (fixing member), 42c: third fixing member (fixing member for second conductive plate), 42d: fourth fixing member (fixing member for second conductive plate), 42e: convex portion, 43: second wall portion, 44: third wall portion, 45: worm wheel accommodating portion, 46: worm wheel, 46a: tooth portion, 47: output shaft, 47a: output Gear, 48: Cover member, 48a: Insertion leg, 49: Worm accommodating section, 50: Bearing mounting section, 51: Motor accommodating section, 51a: First accommodating wall, 51b: Second accommodating wall, 51c: Third accommodating wall, 51d: Fourth accommodating wall, 51e: Engagement recess, 60: Metal jacket, 61: First conductive plate (conductive plate), 61a: First covering section, 61b: Second covering section, 61c: Third covering section, 61d: First fixing section, 61e: Second fixing section, 61f: Engagement protrusion, 61g: Hooking claw, 62: Second conductive plate (conductive plate), 62a: Fourth covering section, 62b: Fifth covering section, 6 2c: sixth covering portion, 62d: support portion, 62e: first insertion hole, 62f: second insertion hole, 62g: third insertion hole, 62h: fourth insertion hole, AG: gap, BR1: first metal, BR2: second metal, CL: coil, EC: conductive member for earthing, FG: windshield, G: notch groove, H1: first screw hole, H2: second screw hole, ha: screw hole, HA: screw hole, HL: insertion hole, MG: permanent magnet, N: claw, PN1: first push nut portion (fixing member), PN2: second push nut portion (fixing member), PN3: third push nut portion (fixing member for second conductive plate),PN4: Fourth push nut part (fixing member for second conductive plate), RG: Bearing support ring, S1: First fastening screw (fastening member), S2: Second fastening screw, SD: Reduction mechanism, SM: Sensor magnet, TL: Heat-generating tool,

Claims

1. a motor having a rotating shaft and a yoke that houses a stator around which a coil is wound; a speed reduction mechanism that reduces the rotation speed of the rotary shaft; a housing that accommodates the reduction mechanism; A motor device comprising: a first conductive plate and a second conductive plate covering the housing to prevent electrical noise from radiating outside the housing; The first conductive plate is the yoke is fixed to the housing by a fastening member that fixes the yoke to the housing, and is electrically connected to the yoke; The second conductive plate is the first conductive plate is fixed to the housing together with the first conductive plate by a fixing member provided on the housing, and is electrically connected to the first conductive plate; Motor device.

2. 2. The motor device according to claim 1, the motor includes a terminal member for supplying a driving current to a coil and a worm forming the reduction mechanism; the first conductive plate covers the coil and the terminal member, and the second conductive plate covers the coil and the worm in a radial direction of the rotary shaft; Motor device.

3. 3. The motor device according to claim 1, When the rotating shaft is viewed from the radial outside, the fixing member is disposed on one side of the rotating shaft, and a second conductive plate fixing member for fixing the second conductive plate to the housing is disposed on the other side of the rotating shaft. Motor device.

4. The motor device according to any one of claims 1 to 3, an engaging protrusion is provided on the first conductive plate, and the engaging protrusion is inserted into an engaging recess provided on the housing; Motor device.

Images