JP2009290925A - Motor apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motor apparatus in which a rotary shaft vibrates neither in the thrust direction nor in the radial direction. <P>SOLUTION: In a motor body 1a, a coil spring 19 energizes the rotary shaft 12 to an anti-output side, and the shaft end on the anti-output side of the rotary shaft 12 is supported with a thrust receiving plate 95 in substantially a point-contacted state or in a line-contacted state, preventing the rotary shaft 12 from vibrating in the thrust direction. An inclined supporting plate part 95f inclined obliquely to a motor shaft line L is formed on the thrust receiving plate 95, allowing the shaft end on the anti-output side of the rotary shaft 12 to be supported with the inclined supporting plate part 95f. Thereby, the rotary shaft 12 is rotated in a slightly inclined state to the motor shaft line L, without any vibration in the radial direction. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a configuration of a motor device, and more particularly to a motor device having a configuration in which a rotating shaft is biased in a thrust direction.

  The motor device has a structure in which one side of a rotating shaft extending from a cylindrical stator portion is rotatably supported by a first bearing portion, while the other side of the rotating shaft is supported by a second bearing portion. . Such a motor device employs a structure that prevents the rotating shaft from vibrating in the thrust direction by urging the rotating shaft in the thrust direction.

  For example, in the motor device 101 shown in FIG. 4, cylindrical radial bearing members 181 and 191 are respectively provided on the output side end plate 171 and the non-output side end plate 172 fixed to both ends of the cylindrical stator portion 120. The rotary shaft 112 is fixed and is rotatably supported by radial bearing members 181 and 191. Between the radial bearing member 181 and the output side end surface of the rotor 110 (the output side end surface of the permanent magnet 111), a coil spring 119 that urges the rotating shaft 112 to the opposite output side is disposed. The thrust receiving plate 195 that receives the shaft end of the rotating shaft 112 on the opposite side to the output side is fixed. The thrust receiving plate 195 includes an annular flange 195a fixed to the opposite output side end of the stator portion 120 via the opposite output end plate 172, and a bottom from the inner periphery of the annular flange 195a to the opposite output side. And a bottom portion 195c of the protruding portion 195b is a vertical plate portion perpendicular to the motor axis L. For this reason, the shaft end portion on the opposite side of the rotating shaft 112 is supported in the thrust direction by the bottom portion 195c of the protruding portion 195b formed on the thrust receiving plate 195.

Here, the shaft end of the rotating shaft 112 on the side opposite to the output side is substantially hemispherical, and the thrust receiving plate 195 is generally in a point contact state or a line contact state. (See, for example, Patent Document 1).
JP 2005-20857 A

  However, the configuration disclosed in Patent Document 1 can prevent the rotating shaft 112 from vibrating in the thrust direction, but is not configured to prevent vibration in the radial direction. That is, clearances are provided between the rotating shaft 112 and the inner peripheral surface of the radial bearing member 181 and between the rotating shaft 112 and the inner peripheral surface of the radial bearing member 191 so that the rotating shaft 112 rotates smoothly. Therefore, when the rotating shaft 112 rotates, the rotating shaft 112 vibrates in the radial direction by the gap caused by the clearance, and noise is generated due to the collision with the bearing inner wall. Such radial vibration can be eliminated to some extent by reducing the clearance. However, when the radial bearing members 181 and 191 are worn, the radial vibration of the rotating shaft 112 increases. In addition, there is a method of applying grease between the rotary shaft 112 and the radial bearing member 181 and between the rotary shaft 112 and the radial bearing member 191. The grease state may change over time, and the effect may fade.

  In view of the above problems, an object of the present invention is to provide a motor device in which a rotating shaft does not vibrate in either a thrust direction or a radial direction.

  In order to solve the above-described problems, in the present invention, a motor main body having a cylindrical stator portion and a rotating shaft extending from the stator portion, and a first bearing portion that rotatably supports one side of the rotating shaft. And a second bearing portion that rotatably supports the other side of the rotating shaft, wherein the rotating shaft is urged in the motor axial direction from the one side toward the other side, The second bearing portion includes a cylindrical radial receiving portion that supports the rotating shaft in the radial direction, and a thrust receiving portion that supports the shaft end portion on the other side of the rotating shaft in the thrust direction. An inclined support that supports the shaft end portion on the other side of the rotating shaft in a posture inclined obliquely with respect to the motor axis and contacts the rotating shaft with a predetermined portion in the circumferential direction of the radial receiving portion. Characterized by having a part That.

  In the present invention, the “motor device” means both “motor unit” before the motor body is mounted on the device and “motor device” after the motor body is mounted on the device.

  That is, in the present invention, a thrust receiving portion is provided in the second bearing portion that receives the rotating shaft on the side where the rotating shaft is urged, and the thrust receiving portion rotates in a posture inclined obliquely with respect to the motor axis. An inclined support portion for supporting the shaft end portion of the shaft is provided. Therefore, according to the present invention, since the rotating shaft rotates while being supported by the thrust receiving portion of the second bearing portion, the rotating shaft does not vibrate in the thrust direction, and therefore noise caused by the collision between the rotating shaft and the thrust receiving portion. Can be prevented. Further, as a result of the rotation shaft being supported at an angle to the motor axis by the inclined support portion of the thrust receiving portion, the rotation shaft rotates while being in contact with a predetermined portion in the circumferential direction of the radial receiving portion of the second bearing portion. Does not vibrate in the radial direction when rotated. Therefore, it is possible to prevent the occurrence of noise due to the collision between the rotating shaft and the radial receiving portion. Further, according to such a configuration, it is possible to prevent vibration of the rotating shaft in the radial direction even when the radial receiving portion is worn. Furthermore, according to the present invention, it is possible to prevent the occurrence of noise regardless of whether or not grease is applied.

  In the present invention, the first bearing portion includes a cylindrical radial receiving portion that supports the rotating shaft in a radial direction, and the rotating shaft is in contact with the radial receiving portion of the first bearing portion; It is preferable that the location where the rotating shaft is in contact with the radial receiving portion of the second bearing portion is located on the opposite side of the motor axis in the circumferential direction.

  In the present invention, the second bearing portion includes a radial bearing member having the radial receiving portion, and a thrust bearing member having the thrust receiving portion and disposed outside the radial bearing member in the motor axial direction. Can be adopted. That is, as the second bearing portion, it is possible to employ a configuration in which the radial receiving portion and the thrust receiving portion are separately provided as the radial bearing member and the thrust bearing member, respectively.

  In the present invention, the second bearing portion may be a cup-shaped member integrally including the radial receiving portion and the thrust receiving portion.

  In the present invention, a configuration is adopted in which the motor main body, the first bearing portion, and the second bearing portion are configured in the motor alone before the motor main body is mounted on a device. can do.

  In the present invention, the motor main body and the first bearing portion are configured in the motor alone before the motor main body is mounted on the device, and the second bearing portion is provided on the device side. A configured configuration can be employed.

  In the present invention, the motor main body, the first bearing portion, and the radial bearing portion of the second bearing portion are configured in the motor single body before the motor main body is mounted on a device. A configuration in which the thrust receiving portion of the second bearing portion is configured on the device side can be employed.

  In the present invention, an urging member that urges the rotating shaft in the motor axial direction from the one side toward the other side is disposed on the side of the motor alone before the motor body is mounted on the device. A configuration can be adopted.

  In this invention, the structure by which the urging member which urges | biases the said rotating shaft toward the said other side from the said one side toward the said other side is arrange | positioned at the apparatus side in which the said motor main body is mounted. be able to.

  In the motor device according to the present invention, since the thrust receiving portion is provided in the second bearing portion that receives the rotation shaft on the side where the rotation shaft is urged, vibration in the thrust direction of the rotation shaft can be prevented. Generation of noise due to the collision between the shaft and the thrust receiving portion can be prevented. In addition, since the thrust receiving portion of the second bearing portion is provided with the inclined support portion that supports the shaft end portion of the rotating shaft in a posture inclined with respect to the motor axis, the rotating shaft is provided with the inclined supporting portion of the thrust receiving portion. As a result of being supported obliquely by the motor axis, the rotary shaft rotates in contact with a predetermined portion in the circumferential direction of the radial receiving portion of the second bearing portion, and therefore the rotating shaft does not vibrate in the radial direction when rotated. Therefore, it is possible to prevent the occurrence of noise due to the collision between the rotating shaft and the radial receiving portion. Further, according to the present invention, even when the radial receiving portion is worn, vibration in the radial direction of the rotating shaft can be prevented, and noise can be prevented regardless of whether or not grease is applied, so that the state of the grease changes. Even in the case of noise, generation of noise can be prevented.

  A motor apparatus to which the present invention is applied will be described below with reference to the drawings.

In the present invention, the “motor device” means both “motor unit” before the motor body is mounted on the device and “motor device” after the motor body is mounted on the device. Therefore, in the former case, the motor alone has a “motor body”, “first bearing portion”, and “second bearing portion”. On the other hand, in the latter case, the following three forms (1), (2), (3)
Form (1): The motor unit has a “motor body”, “first bearing part”, and “second bearing part”. Form (2): The motor unit includes only the “motor body” and “first bearing part”, and the motor. Form in which the unit on which the single unit is mounted is provided with the second bearing part (radial receiving part and thrust receiving part). Form (3) The motor single unit is “motor body”, “first bearing receiving part”, “radial of the second bearing part” A configuration in which only the “receiving portion” is provided, and the device side on which the motor alone is mounted is provided with a thrust receiving portion of the second bearing portion), and the present invention can be applied to any form.

  Further, according to the present invention, when the urging member for urging the rotating shaft in the thrust direction is built in the motor alone, and the urging member for urging the rotating shaft in the thrust direction is arranged on the device side. It can be applied to any of the cases.

  Therefore, in the following description, the case where the motor unit (motor device) has the “motor body”, the “first bearing portion”, the “second bearing portion”, and the “urging member” will be described as the first embodiment. In addition, the motor alone includes only the “motor body”, “first bearing receiving portion”, and “biasing member”, and the frame of the device on which the motor alone is mounted includes the second bearing portion (radial receiving portion and thrust receiving portion). This embodiment will be described as a second embodiment.

  In the following description, regarding the name of the bearing portion, regardless of the output side or the counter-output side, the bearing portion arranged on the side that urges the rotating shaft is referred to as “first bearing portion”, and the rotating shaft is The bearing portion disposed on the biased side is referred to as a “second bearing portion”. In the following description, the side from which the rotating shaft protrudes is referred to as “output side”, and the opposite side is referred to as “non-output side”. Furthermore, in this embodiment, since the rotation axis is inclined, the “motor axis” means the center axis of the stator portion.

[Embodiment 1]
(overall structure)
FIGS. 1A and 1B are a half sectional view showing the configuration of the motor device according to Embodiment 1 of the present invention, and an explanatory view of a thrust receiving plate of the motor device. FIGS. 2A and 2B are respectively an explanatory diagram of a force applied to the rotating shaft in the motor device according to the first embodiment of the present invention, and an explanatory diagram showing a support structure in the radial direction with respect to the rotating shaft.

  As shown in FIG. 1A, the motor device 1 (motor unit) of this embodiment includes a motor main body 1a formed of a stepping motor, and the motor main body 1a includes a rotating shaft 12 constituting an output shaft, and The rotor 10 includes a cylindrical permanent magnet 11 fixed to the outer peripheral surface of the rotary shaft 12, and the cylindrical stator portion 20 whose inner peripheral surface faces the outer peripheral surface of the permanent magnet 11. On the outer peripheral surface of the permanent magnet 11, N poles and S poles are alternately arranged in the circumferential direction. A gear 15 is fixed to the output side of the rotary shaft 12.

  The stator unit 20 includes a pair of stator sets 21 and 22 arranged in an axial direction so that the stator sets 21 and 22 are annular coils 213 and 223 wound around insulators 216 and 226, respectively. And stator cores 211, 212, 221, 222 disposed on both sides of the coils 213, 223 in the axial direction. Each of the stator cores 211, 212, 221, 222 includes a large number of pole teeth 217, 227 formed upright along the inner peripheral surfaces of the coils 213, 223. The formed pole teeth 217 enter between the pole teeth 217 formed on the stator core 212, and the pole teeth 217 formed on the stator core 211 and the pole teeth 217 formed on the stator core 212 are on the inner peripheral surface of the stator assembly 21. The pole teeth 227 formed on the stator core 221 in a state in which the stator assembly 22 is configured are alternately arranged in the circumferential direction, and are inserted into the pole teeth 227 formed on the stator core 222 to be formed on the stator core 221. The pole teeth 217 formed on the stator core 222 are alternately arranged on the inner peripheral surface of the stator assembly 22 in the circumferential direction. The arrangement state. A terminal block 2 is formed on a side surface portion of the stator portion 20, and a terminal 3 is fixed to the terminal block 2. Of the both end faces of the stator portion 20, the stator core 211 positioned on the output side end face is provided with an output side end plate 71 that is used as a fixed plate or the like when the motor body 1 a is mounted on a device. The counter-output side end plate 72 is fixed to the stator core 221 positioned on the counter-output side end face of the stator portion 20 so as to be orthogonal to the motor axis L.

(Bearing structure)
In this embodiment, the first bearing portion 8 that supports the rotary shaft 12 so as to be rotatable on the output side is held using the output side end plate 71, and the rotary shaft 12 is counter output using the counter output side end plate 72. A second bearing portion 9 that is rotatably supported on the side is held.

  In this embodiment, when configuring the first bearing portion 8, a hole 71 a is formed in the output side end plate 71, and the hole 71 a is a cylinder that rotatably supports the rotary shaft 12 in the radial direction on the output side. A radial bearing member 81 (radial receiving portion) is fixed. In this embodiment, a sintered bearing is used as the radial bearing member 81.

  Further, when configuring the second bearing portion 9, a hole 72 a is formed in the counter-output side end plate 72, and the rotary shaft 12 is supported in the hole 72 a so as to be rotatable in the radial direction on the counter-output side. A cylindrical radial bearing member 91 (radial receiving portion) is fixed. In this embodiment, a sintered bearing is used as the radial bearing member 91. Moreover, the 2nd bearing part 9 is equipped with the metal thrust receiving plate 95 (thrust receiving part) for the reason demonstrated below.

(Thrust vibration countermeasures)
In the motor body 1a of this embodiment, for the purpose of preventing the rotating shaft 12 from vibrating in the thrust direction when the rotor 10 rotates, first, the radial bearing member 81 and the output side end face of the rotor 10 (the output side of the permanent magnet 11). A coil spring 19 as a spring member that urges the rotating shaft 12 to the opposite output side is disposed around the rotating shaft 12. Thus, when arrange | positioning the coil spring 19, in this form, the annular recessed part 11a opened while expanding to the output side is formed concentrically with the rotating shaft 12 in the output side end surface of the permanent magnet 11. FIG. The end of the coil spring 19 on the opposite side to the output side is accommodated in the annular recess 11a. Here, a large-diameter washer 41 is disposed between the output-side end of the coil spring 19 and the counter-output-side end surface of the radial bearing member 81, and the counter-output-side end of the coil spring 19 and the bottom of the annular recess 11a. A small-diameter washer 42 is disposed between the two. Therefore, when the rotating shaft 12 rotates, a sliding surface is formed between the radial bearing member 81 and the washer 41, and / or between the bottom of the annular recess 11a and the washer 42.

  Further, in the second bearing portion 9, a thrust receiving plate 95 that receives the shaft end portion on the counter-output side of the rotary shaft 12 is disposed on the counter-output side with respect to the output-side end plate 71. The thrust receiving plate 95 protrudes from the inner peripheral edge of the annular flange 95a to the counter-output side through an output-side end plate 71 and an annular flange 95a fixed to the counter-output-side end of the stator portion 20. The bottom portion 95c of the protrusion portion 95b supports the shaft end portion of the rotating shaft 12 on the opposite side to the output side. The shaft end on the counter-output side of the rotating shaft 12 is substantially hemispherical, and the thrust receiving plate 95 supports the shaft end portion on the counter-output side of the rotating shaft 12 in a generally line contact state.

  Therefore, in the motor main body 1a of this embodiment, the coil spring 19 urges the rotating shaft 12 to the non-output side, and the shaft end portion on the counter-output side of the rotating shaft 12 is supported by the thrust receiving plate 95. This is because, when the shaft 12 rotates, the rotating shaft 12 does not vibrate in the thrust direction, the radial bearing members 81 and 91 wear, the rotating shaft 12 moves in the thrust direction, and contacts the thrust receiving plate 95. It is possible to prevent the generation of a large abnormal noise.

  The coil spring 19 is disposed between the output-side first radial bearing member 81 and the output-side end surface of the rotor 10 (the output-side end surface of the permanent magnet 11), and the thrust receiving plate 955 is opposite to the stator portion 20. Since it is fixed to the output side end, vibration in the thrust direction of the rotating shaft 12 can be prevented in the motor body 1a. Therefore, even when the shaft end on the output side of the rotating shaft 12 cannot be supported, the rotating shaft 12 can be prevented from vibrating in the thrust direction.

  Further, the rotating shaft 12 biased to the opposite output side is supported by a thrust receiving plate 85 with which the shaft end abuts and is generally in a point contact state or a line contact state. Torque loss due to the can be kept small.

(Measures against radial vibration)
In this embodiment, a structure is employed in which a thrust receiving plate 95 for preventing the rotating shaft 12 from vibrating in the thrust direction is used to prevent the rotating shaft 12 from vibrating in the radial direction. Specifically, the thrust receiving plate 95 used in the motor device 1 of the present embodiment is configured to support the shaft end portion of the rotating shaft 12 on the side opposite to the output side in an obliquely inclined posture. More specifically, in the bottom 95c of the thrust receiving plate 95, the portion through which the motor axis L passes, that is, the portion with which the shaft end on the opposite side of the rotary shaft 12 contacts is inclined with respect to the motor axis L. An inclined support plate portion 95f (inclined support portion) is formed, and a portion adjacent to the inclined support plate portion 95f on one side orthogonal to the motor axis L is substantially parallel to the non-output side end plate 72. The vertical plate portion 95e is substantially perpendicular to the motor axis L. In this embodiment, the inclined support plate portion 95f is formed so as to be inclined by 5 to 45 degrees with respect to a plane orthogonal to the motor axis L.

  Further, at the bottom 95c of the thrust receiving plate 95, on the side opposite to the vertical plate 95e with respect to the inclined support plate 95f, a vertical plate 95g that is substantially parallel to the non-output side end plate 72 and substantially orthogonal to the motor axis L. , And an inclined plate portion 95 h inclined obliquely with respect to the motor axis L, and the bottom portion 95 c of the protruding portion 95 b of the thrust receiving plate 95 is asymmetric in a direction orthogonal to the motor axis L. It has become.

  Therefore, as shown in FIG. 2A, the rotating shaft 12 is subjected to a biasing force toward the counter-output side by the coil spring 19 as shown by an arrow Fa, while the rotating shaft 12 has a reaction force as a reaction force. The component Fa ′ parallel to the motor axis L and the component Fb orthogonal to the motor axis L act, and this component is expressed as an oblique force F with respect to the motor axis L. Therefore, the end on the counter-output side of the rotary shaft 12 is displaced so as to contact the counter-output-side edge 91e in the inner diameter portion of the radial bearing member 91, as shown in FIG. The shaft 12 rotates in a state where the end portion on the counter-output side is in contact with the edge 91 e of the inner diameter portion of the radial bearing member 91.

  On the other hand, a reaction force perpendicular to the motor axis L acts on the output side of the rotary shaft 12 as shown by an arrow Fb '. Therefore, the output side portion of the rotary shaft 12 is as shown in FIG. Further, the radial bearing member 81 rotates while being displaced so as to abut on the output-side edge 81e in the inner diameter portion of the radial bearing member 81.

  Here, the edge 81e with which the rotary shaft 12 abuts in the radial bearing member 81 and the edge 91e with which the rotary shaft 12 abuts in the radial bearing member 91 are located on opposite sides of the motor axis L, and rotate. The shaft 12 is rotated in a posture slightly inclined with respect to the motor axis L in a state where the position is restricted in the radial direction by the edges 81 e and 91 d of the radial bearing members 81 and 91. Moreover, the posture in which the rotating shaft 12 is slightly inclined with respect to the motor axis L is maintained. Therefore, the rotating shaft 12 does not vibrate in the radial direction.

  In addition, the rotary shaft 12 is initially in contact with the edge 81e of the radial bearing member 81 and the edge 91e of the radial bearing member 91, but the edge 81e of the radial bearing member 81 and The edge 91e of the radial bearing member 91 is worn and comes into surface contact. Still, the portion where the rotary shaft 12 abuts against the radial bearing member 81 (the portion which was the edge 81e) and the portion where the rotary shaft 12 abuts against the radial bearing member 91 (the portion which was the edge 91e) are the motor axis L. The rotating shaft 12 rotates in a posture slightly inclined with respect to the motor axis L in a state where the position is regulated in the radial direction. Therefore, the rotating shaft 12 does not vibrate in the radial direction.

(Main effects of this form)
As described above, in the motor device 1 of the present embodiment, the thrust receiving plate 95 is provided on the second bearing portion 9 that receives the rotary shaft 12 on the side opposite to the output side where the rotary shaft 12 is biased by the coil spring 19. The rotating shaft 12 does not vibrate in the thrust direction. Therefore, the generation of noise due to the collision between the rotating shaft 12 and the thrust receiving plate 95 can be prevented.

  Further, in the second bearing portion 9, the thrust receiving plate 95 supports the shaft end portion of the rotating shaft 12 in a posture inclined obliquely with respect to the motor axis L, and the shaft end on the counter-output side of the rotating shaft 12 is supported. Since the inclined support plate portion 95f is provided so that the portion abuts against a predetermined position in the circumferential direction of the radial bearing member 91, the rotary shaft 12 has a predetermined position in the circumferential direction (radial bearing 91) on the inner periphery of the radial bearing 91. Rotate in a state of being in contact with the edge 91e). Therefore, when the rotating shaft 12 rotates, the non-output side end portion of the rotating shaft 12 does not vibrate in the radial direction. In addition, the rotary shaft 12 has a motor axis line L with respect to a portion (the edge 91e of the radial bearing 91) where the rotary shaft 12 is in contact with the radial bearing 91 in the radial bearing member 81 of the first bearing portion 8 on the output side. Since it rotates in the state which contact | abutted on the opposite side (edge 81e of the radial bearing member 81) on both sides, the output side edge part of the rotating shaft 12 does not vibrate in the radial direction either. Therefore, since it is possible to reliably prevent the rotating shaft 12 from vibrating in the radial direction, the occurrence of noise due to the collision between the rotating shaft 12 and the inner peripheral surface of the radial bearing 91, and the rotating shaft 12 and the radial Generation of noise due to collision with the inner peripheral surface of the bearing member 81 can be prevented.

  Further, according to this embodiment, an appropriate reaction force can be generated on the rotary shaft 12 with a simple configuration in which the inclination of the inclined support portion 95f is changed.

  Further, in this embodiment, since a structure is adopted in which the shaft end portion of the rotating shaft 12 is supported obliquely by the inclined support plate portion 95f in which a part of the bottom portion 95c of the thrust receiving plate 95 is inclined, the plate spring formed on the metal plate Unlike the configuration in which the side pressure is applied to the rotating shaft 12 by the portion, there is no problem that the strength and urging force of the leaf spring portion must be set strictly.

  Further, with such radial vibration countermeasures, radial vibration of the rotating shaft 12 can be prevented even when the radial bearing members 81 and 91 are worn. Moreover, according to the present embodiment, there is an advantage that noise can be prevented regardless of whether or not grease is applied.

[Embodiment 2]
FIGS. 3A and 3B are respectively a half sectional view showing the configuration of the motor device according to Embodiment 2 of the present invention, and an explanatory view showing an enlarged thrust receiving portion of the motor device. Since the basic configuration of the motor of the present embodiment is the same as that of the first embodiment, common portions are denoted by the same reference numerals, and detailed description thereof is omitted.

  Similarly to the first embodiment, the motor device 1 (motor device) shown in FIG. 3A also includes a motor main body 1a made of a stepping motor. The non-output side end plate 72 is fixed. On the other hand, a connecting plate portion 68 of a U-shaped metal frame 60 is fixed to the output side end surface of the stator portion 20 by a bolt 66. A hole 60c is formed in the connecting plate portion 68 at a position overlapping the hole 71c of the output side end plate 71, and the rotary shaft 12 extends so as to penetrate the holes 60c and 71c.

  In this embodiment, the first bearing portion 5 that supports the rotary shaft 12 so as to be rotatable on the non-output side using the counter-output side end plate 72 is held, and the counter plate portion 69 that faces the connecting plate portion 68 in the frame 60. The 2nd bearing part 6 which rotatably supports the rotating shaft 12 on the output side is comprised.

  In this embodiment, when configuring the first bearing portion 5, a hole 72 c is formed in the counter-output side end plate 72, and the hole 72 a has a cylindrical shape that rotatably supports the rotary shaft 12 on the counter-output side. The radial bearing member 51 (radial receiving portion) is fixed. In this embodiment, a sintered bearing is used as the radial bearing member 51.

  Further, in configuring the second bearing portion 6, the frame 60 is a cup-shaped member in which a hole 63 in which the output side end portion of the rotating shaft 12 is inserted is formed in the counter plate portion 69. A radial receiving portion 61 parallel to the motor axis L is constituted by the inner peripheral side surface. In the second bearing portion 6, the bottom portion of the hole 63 is used as the thrust receiving portion 62 for the reason described below.

  In the motor main body 1a of the present embodiment, for the purpose of preventing the rotating shaft 12 from vibrating in the thrust direction when the rotor 10 rotates, first, the radial bearing member 51 and the counter-output side end face of the rotor 10 (the counter-current of the permanent magnet 11). A coil spring 18 as a spring member that biases the rotary shaft 12 toward the output side is disposed around the rotary shaft 12. In arranging this coil spring 18, in this embodiment, an annular recess 11 b that opens while expanding the diameter toward the counter-output side is formed concentrically with the rotary shaft 12 on the counter-output side end face of the permanent magnet 11. The end of the coil spring 18 on the output side is accommodated in the annular recess 11b. Here, a large-diameter washer 46 is disposed between the end on the opposite side of the coil spring 18 and the output side end face of the radial bearing member 51, and the end on the output side of the coil spring 18 and the bottom of the annular recess 11b. A small-diameter washer 47 is disposed between them. Therefore, when the rotating shaft 12 rotates, a sliding surface is formed between the radial bearing member 51 and the washer 45 or / and between the bottom of the annular recess 11b and the washer 47.

  Thus, in the motor main body 1a of this embodiment, the coil spring 18 urges the rotary shaft 12 to the output side, and the shaft end portion on the output side of the rotary shaft 12 is supported by the thrust receiving portion 62. When the shaft 12 rotates, the rotating shaft 12 does not vibrate in the thrust direction, and wear of the radial bearing member 51 and the radial receiving portion 61 and generation of a large noise can be prevented. The rotating shaft 12 biased to the output side is supported by the thrust receiving portion 62 in a point contact state or a line contact state because the shaft end portion on the output side is hemispherical. Further, torque loss due to sliding at the thrust receiving portion 62 can be reduced.

  Furthermore, in this embodiment, a structure is employed in which the thrust receiving portion 62 for preventing vibration in the thrust direction is used to prevent vibration of the rotating shaft 12 in the radial direction. Specifically, the thrust receiving portion 62 used in the motor device 1 of the present embodiment is an inclined support portion that is inclined obliquely with respect to the motor axis L as shown in FIGS. 3 (a) and 3 (b). Yes. Therefore, since the force indicated by the arrow Fb is applied to the end on the counter-output side of the rotary shaft 12, the end on the output side of the rotary shaft 12 is connected to the motor axis L in the inner peripheral portion of the radial receiving portion 61. On the other hand, it is displaced so as to contact the part 61e located on one side, and the rotating shaft 12 rotates in a state of contacting the part 61e. On the other hand, since the force indicated by the arrow Fb ′ acts on the counter-output side of the rotary shaft 12, the counter-output-side end of the rotary shaft 12 is the counter-output-side edge 51 e of the inner diameter portion of the radial bearing member 51. Rotates in a state of being displaced so as to abut against. In this embodiment, the thrust receiving portion 62 (inclined support portion) is formed so as to be inclined by 5 to 45 degrees with respect to a plane orthogonal to the motor axis L.

  Here, the portion 61e with which the rotating shaft 12 abuts in the radial receiving portion 61 and the edge 51e with which the rotating shaft 12 abuts in the radial bearing member 51 are located on opposite sides of the motor axis L, and rotate. Since the shaft 12 rotates in a posture slightly inclined with respect to the motor axis L, the rotating shaft 12 does not vibrate in the radial direction. Therefore, it is possible to reliably prevent the rotating shaft 12 from vibrating in the radial direction, and thus it is possible to prevent the generation of noise. Further, with such radial vibration countermeasures, the radial vibration of the rotating shaft 12 can be prevented even when the radial receiving portion 61 and the radial bearing member 51 are worn. Moreover, according to the present embodiment, there is an advantage that noise can be prevented regardless of whether or not grease is applied.

  Further, according to this embodiment, an appropriate reaction force can be generated on the rotary shaft 12 with a simple configuration in which the inclination of the thrust receiving portion 62 is changed.

[Embodiment 3]
In the first embodiment, the motor unit (motor device) has the “motor main body”, the “first bearing portion”, and the “second bearing portion”. In the second embodiment, the motor single unit is the “motor main body” “ Although the frame of the equipment on which the motor alone is mounted was provided with the second bearing portion, the motor alone was the “motor body”, “first bearing portion”, “radial receiving portion of the second bearing portion”. However, a configuration may be adopted in which the device side on which the motor alone is mounted is provided with the thrust receiving portion of the second bearing portion. More specifically, for example, in the first embodiment, the inclined support portion such as the inclined support plate portion 95f described with reference to FIGS. 1 and 2 is provided on the side of the device on which the motor main body 1a and the motor alone are mounted. A configuration may be adopted in which the inclined support portion supports the shaft end portion on the counter-output side of the rotary shaft 12 in an oblique posture.

[Other embodiments]
In the first embodiment, the vertical plate portion 95e, the inclined support plate portion 95f, the vertical plate portion 95g, and the inclined plate portion 95h are provided on the bottom portion 95c for the purpose of ensuring the strength of the bottom portion 95c of the thrust receiving plate 95. As long as at least the inclined support plate portion 95f is provided, the structure of the thrust receiving plate 95 is not limited to the structure shown in FIG.

  The cup-shaped member integrally provided with the radial receiving portion and the thrust receiving portion employed in the second embodiment may be employed in the second bearing portion disposed on the non-output side in the first embodiment.

  In the first and second embodiments, the permanent magnet 11 is biased in the thrust direction by the coil springs 18 and 19. However, a thrust force in the thrust direction may be directly applied to the shaft end of the rotating shaft 12.

  In the above embodiment, the rotating shaft 12 is biased in the thrust direction by the coil springs 18 and 19, but the rotating shaft 12 is thrust in the thrust direction by another spring such as a spring member cut out from a metal plate, for example. It may be energized.

  In the first and second embodiments, the rotating shaft 12 is urged in the thrust direction by the coil springs 18 and 19 disposed in the motor main body 1a, but the motor device 1 is configured by mounting the motor main body 1a on various devices. If the rotating shaft 12 is urged in the thrust direction, the motor body 1a itself is not loaded with a spring, and the motor body 1 is configured with the motor body 1a mounted on various devices. A configuration in which the rotating shaft 12 is urged in the thrust direction by a spring mounted on the 1a side may be employed.

  In the first and second embodiments, the motor body 1a is an example of a stepping motor. However, when the motor body 1a is a motor other than the stepping motor, such as the motor body 1a is a motor with a brush, the present invention is applied. You may apply.

(A), (b) is a half sectional view which shows the structure of the motor apparatus based on Embodiment 1 of this invention, respectively, and explanatory drawing of the thrust receiving plate of this motor apparatus. (A), (b) is explanatory drawing of the force added to a rotating shaft in the motor apparatus which concerns on Embodiment 1 of this invention, respectively, and explanatory drawing which shows the support structure of the radial direction with respect to a rotating shaft. (A), (b) is the half sectional view which respectively shows the structure of the motor apparatus based on Embodiment 2 of this invention, and explanatory drawing which expands and shows the thrust receiving part of this motor apparatus. It is a half sectional view showing the configuration of a conventional motor.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1a Motor main body 5, 8 1st bearing part 6, 9 2nd bearing part 10 Rotor 11 Permanent magnet 12 Rotating shaft 18, 19 Coil spring (spring member)
20 Stator 51, 81, 91 Radial bearing member (radial bearing)
61 Radial receiving part 62 Thrust receiving part (inclined support part)
95 Thrust receiving plate (thrust receiving part)
95f Inclined support plate (inclined support)

Claims (9)

A motor main body having a cylindrical stator portion and a rotating shaft extending from the stator portion, a first bearing portion rotatably supporting one side of the rotating shaft, and the other side of the rotating shaft rotatable A motor device having a second bearing portion to support,
The rotating shaft is urged in the motor axial direction from the one side toward the other side,
The second bearing portion includes a cylindrical radial receiving portion that supports the rotating shaft in the radial direction, and a thrust receiving portion that supports the shaft end portion on the other side of the rotating shaft in the thrust direction.
The thrust receiving portion supports the shaft end portion on the other side of the rotating shaft in a posture inclined obliquely with respect to the motor axis, and contacts the rotating shaft with a predetermined portion in the circumferential direction of the radial receiving portion. A motor device comprising an inclined support portion to be moved. The motor device according to claim 1,
The first bearing portion includes a cylindrical radial receiving portion that supports the rotating shaft in a radial direction,
The portion where the rotary shaft is in contact with the radial receiving portion of the first bearing portion and the portion where the rotary shaft is in contact with the radial receiving portion of the second bearing portion are the motor axis line in the circumferential direction. A motor device, characterized in that it is located on the opposite side to be sandwiched. The motor device according to claim 1 or 2,
The second bearing portion includes a radial bearing member having the radial receiving portion, and a thrust bearing member disposed outside the radial bearing member in the motor axial direction with the thrust receiving portion. Motor device. The motor device according to claim 1 or 2,
The motor device according to claim 1, wherein the second bearing portion is a cup-shaped member integrally including the radial receiving portion and the thrust receiving portion. In the motor apparatus as described in any one of Claims 1 thru | or 4,
The motor device, wherein the motor main body, the first bearing portion, and the second bearing portion are configured in the motor single body before the motor main body is mounted on a device. In the motor apparatus as described in any one of Claims 1 thru | or 4,
In the state of the motor alone before the motor body is mounted on the device, the motor body and the first bearing portion are configured in the motor alone,
The motor device, wherein the second bearing portion is formed on the device side. The motor device according to claim 1, 2, or 3,
In the state of the motor alone before the motor body is mounted on the device, the motor body, the first bearing portion, and the radial receiving portion of the second bearing portion are configured in the motor alone,
The motor device, wherein the thrust receiving portion of the second bearing portion is formed on the device side. The motor device according to any one of claims 1 to 7,
An urging member for urging the rotating shaft in the motor axial direction from the one side toward the other side is disposed on the side of the motor alone before the motor body is mounted on the device. Motor device. The motor device according to any one of claims 1 to 7,
A motor device, wherein an urging member that urges the rotating shaft in the motor axial direction from the one side toward the other side is disposed on a device side on which the motor body is mounted.

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