JP2005333781A - Motor and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motor in which it can easily set to make a rotor moveable with respect to a motor casing in the axial direction at a prescribed range. <P>SOLUTION: Motor is provided with the motor casing (a yoke 1 and end frame 3), on both ends of the axial direction of which first and second bearings 5, 6 are fixed, and the rotor 7, which has a rotating shaft 11 supported rotatably by the first and second bearings 5, 6 and made moveable to the motor casing in the axial direction within a prescribed range. The rotor 7 comprises a gear 16, which regulates the movement in the other direction of the axial direction by abutting against one end (via a washer 18) of the second bearing 6, and the gear 16 and a collar 15, which regulates the movement in one direction of the axial direction, by contacting the other end (via a washer 17) of the first bearing 5. It is set by the gear 1 and the collar 15 to make the rotor moveable with respect to the motor casing in the axial direction within the prescribed range. The gear 16 is fixed on the rotating shaft 11 outside the motor casing. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a motor in which a rotating shaft is supported by a motor case via a bearing, and a method for manufacturing the motor.

  Conventionally, some motors include a motor case in which bearings are fixed at both ends in the axial direction, and a rotor having a rotating shaft that is rotatably supported by the bearings. For example, the motor case has a permanent magnet fixed to the inner surface thereof and constitutes a stator together with the permanent magnet. Further, for example, the rotor has an armature core and a commutator fixed to a rotating shaft.

  In such a motor, it is desirable that the rotor (rotating shaft) is rotatably supported with respect to the motor case and can be moved in a predetermined range in the axial direction (providing play). It is known that in a motor that can be moved larger or smaller than the predetermined range, vibration and noise increase and torque loss increases.

A motor for setting the axial position of the bearing using a plurality of types of washers and setting the predetermined range is considered. On the other hand, in order to eliminate the need for a plurality of types of washers, There is one that holds a bearing by applying pressure from the outside to a cylindrical bearing holding portion (for example, see Patent Document 1). In such a motor, if the bearing can be positioned at a position so that the rotor can move within a predetermined range, the bearing can be easily fixed at the position so as not to move in the axial direction (by simply applying pressure from the outside). it can. Therefore, as compared with a method in which a large number of types of washers are adjusted to set the axial position of the bearing, there is no step of adjusting the number of washers, and the work time is shortened and the number of parts is reduced.
JP 2003-032956 A

  However, in the above prior art (Patent Document 1), a bearing fixing structure and a fixing method are described. However, the structure and method for setting the predetermined range (structure and method for positioning the bearing) are described. Is not mentioned, and setting the predetermined range is expected to be structurally difficult.

  SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a motor and a motor that can easily set a rotor to be movable in a predetermined range in an axial direction with respect to a motor case. It is in providing the manufacturing method of.

  According to the first aspect of the present invention, the motor case includes a motor case in which bearings are fixed at both ends in the axial direction, and a rotating shaft that is rotatably supported by the bearing. A predetermined range in the axial direction with respect to the motor case. A rotor that is movable at a first axial locking member that restricts movement in the other axial direction by contacting the one end of the bearing; and A second axial locking member that restricts movement in one axial direction by contacting the other end of the bearing, and the first and second axial locking members against the motor case. The first axial locking member is fixed to the rotating shaft outside the motor case. The first axial locking member is set to be movable within a predetermined range in the axial direction.

According to a second aspect of the present invention, in the motor according to the first aspect, the second axial locking member is a commutator that is fixed to the rotating shaft inside the motor case.
According to a third aspect of the present invention, in the motor according to the first aspect, the second axial locking member is fixed to the rotating shaft outside the motor case.

  According to a fourth aspect of the present invention, a motor case having bearings fixed at both ends in the axial direction and a rotating shaft that is rotatably supported by the bearing are provided. The motor case has a predetermined range in the axial direction. The rotor is movable to the other end in the axial direction by being fixed to the rotating shaft inside the motor case and coming into contact with one end of the bearing. A regulating collar, and a commutator that is fixed to the rotating shaft inside the motor case and abuts against the other end of the bearing so as to regulate movement in one direction in the axial direction. The motor case is set to be movable within a predetermined range in the axial direction, and at least one of the bearings is fixed by applying a load to the motor case from the outside of the motor case. That.

  According to a fifth aspect of the present invention, in the motor according to the fourth aspect, the bearing fixed by applying a load is a metal bearing, and an annular groove coaxial with the rotating shaft is formed.

  According to the sixth aspect of the present invention, bearings are fixed to both ends of the motor case in the axial direction, and the rotary shaft of the rotor is rotatably supported by the bearings, and the rotor is axially fixed to the motor case in a predetermined range. And a first axial direction member that is fixed to the rotating shaft outside the motor case and abuts against one end of the bearing to restrict movement in the other axial direction. The rotor is fixed to the motor case by a stop member and a second axial locking member that is fixed to the rotating shaft and abuts against the other end of the bearing to restrict movement in one axial direction. A predetermined range setting step of setting the movable range within a predetermined range in the axial direction;

  According to a seventh aspect of the present invention, in the method for manufacturing a motor according to the sixth aspect, the predetermined range setting step includes a contact step of bringing the second axial locking member into contact with the other end of the bearing. And a predetermined separating step of moving the rotation shaft after the contacting step to separate the second axial locking member from the other end of the bearing by an amount corresponding to the predetermined range; And a fixing step of fixing the first axial locking member so as to come into contact with one end of the bearing while holding the rotating shaft.

  According to an eighth aspect of the present invention, in the method for manufacturing a motor according to the sixth aspect, the predetermined range setting step includes a contact step of bringing the second axial locking member into contact with the other end portion of the bearing. And after the abutting step, a fixing step of fixing the first axial locking member to abut one end of the bearing while holding the rotating shaft, and after the fixing step, the rotating shaft By moving one of the first and second axial locking members with respect to the rotation shaft, the other of the first and second axial locking members is moved to one end of the bearing. Or a predetermined separation step of separating from the other end of the bearing by an amount corresponding to the predetermined range.

  According to a ninth aspect of the present invention, in the method for manufacturing a motor according to the sixth aspect, the predetermined range setting step includes a contact step of bringing the second axial locking member into contact with the other end of the bearing. And a predetermined spacing fixing step of fixing the first axial locking member so as to be spaced apart from one end portion of the bearing by an amount corresponding to the predetermined range after holding the rotating shaft. With.

  According to a tenth aspect of the present invention, in the motor manufacturing method according to the ninth aspect, the predetermined spacing and fixing step includes the first axial direction engagement so as to sandwich a jig corresponding to the predetermined range together with the bearing. A fixing step of fixing the stop member; and a jig removing step of removing the jig from between the bearing and the first axial locking member after the fixing step.

  According to an eleventh aspect of the present invention, in the motor manufacturing method according to the ninth aspect, the predetermined separation and fixing step is performed while measuring a distance between the first axial locking member and one end of the bearing. .

  In a twelfth aspect of the present invention, bearings are fixed to both ends of the motor case in the axial direction, the rotary shaft of the rotor is rotatably supported by the bearings, and the rotor is axially fixed with respect to the motor case. And a motor that is fixed to the rotary shaft inside the motor case and that abuts against one end of the bearing to restrict movement in the other axial direction, and the motor. The rotor is fixed to the motor case in a predetermined range in the axial direction with respect to the motor case by a commutator fixed to the rotating shaft inside the case and restricting movement in one axial direction by contacting the other end of the bearing. A predetermined range setting step for fixing at least one of the bearings by applying a load to the motor case from the outside of the motor case so as to be set to be movable; .

  According to a thirteenth aspect of the present invention, in the motor manufacturing method according to the twelfth aspect, the predetermined range setting step includes a bearing fixing step of fixing one of the bearings, and after the bearing fixing step, the collar and A contact step in which the commutator is placed in contact with the bearing; and after the contact step, the rotating shaft is moved to move the collar or the commutator from one of the bearings to the predetermined range. And a bearing load fixing step of fixing the other bearing by applying a load while holding the rotating shaft after the predetermined spacing step.

(Function)
According to the first aspect of the present invention, the rotor is in contact with the first axial locking member that restricts movement in the other axial direction by contacting the one end of the bearing, and the other end of the bearing. And a second axial locking member for restricting movement in one axial direction, and the first and second axial locking members can move in a predetermined range in the axial direction with respect to the motor case. Set to And since the 1st axial direction locking member is fixed to a rotating shaft outside the motor case, it can set a predetermined range from the outside of a motor case. Therefore, the rotor can be easily set so as to be movable within a predetermined range in the axial direction with respect to the motor case.

According to the second aspect of the present invention, the second axial locking member is a commutator that is fixed to the rotating shaft inside the motor case, so the number of parts does not increase.
According to the third aspect of the present invention, since the second axial locking member is fixed to the rotating shaft outside the motor case, the motor can be operated by either the first or second axial locking member. A predetermined range can be set outside the case. Further, for example, compared to the case where the second axial locking member is a commutator fixed to the rotating shaft inside the motor case, it is possible to reduce the adhesion of the lubricating oil of the bearing to the commutator (segment). .

  According to the fourth aspect of the present invention, the rotor is fixed to the rotating shaft inside the motor case and is in contact with one end of the bearing so as to restrict movement in the other axial direction. And a commutator that restricts movement in one axial direction by contacting the other end of the bearing. The rotor is set to be movable in a predetermined range in the axial direction with respect to the motor case by the collar and the commutator. Since at least one bearing is fixed by applying a load to the motor case from the outside of the motor case, a predetermined range can be set from the outside of the motor case. In addition, since the member that restricts movement in one axial direction by contacting (indirectly including) the other end of the bearing is a commutator, the number of parts does not increase.

  According to the fifth aspect of the present invention, the bearing fixed by applying a load is a metal bearing, and an annular groove coaxial with the rotary shaft is formed. Is suppressed. Therefore, the rotating shaft can be favorably supported.

  According to the sixth aspect of the present invention, in the predetermined range setting step, the rotor is in contact with one end portion of the bearing to thereby restrict the movement in the other axial direction, and the bearing It is set so as to be movable within a predetermined range in the axial direction with respect to the motor case by the second axial locking member that restricts movement in one axial direction by contacting the other end. And since the 1st axial direction locking member is fixed to a rotating shaft outside the motor case, it can set a predetermined range from the outside of a motor case. Therefore, the rotor can be easily set so as to be movable within a predetermined range in the axial direction with respect to the motor case.

  According to the seventh aspect of the present invention, in the contact step, the second axial locking member is brought into contact with the other end portion of the bearing, and thereafter, in the predetermined separation step, the rotation shaft is moved to move the second shaft. The direction locking member is separated from the other end of the bearing by an amount corresponding to a predetermined range. Thereafter, in the fixing step, the first axial locking member is fixed so as to come into contact with one end of the bearing while the rotating shaft is held. Therefore, the rotor is set to be movable in a predetermined range in the axial direction with respect to the motor case.

  According to the invention described in claim 8, in the contact step, the second axial locking member is brought into contact with the other end portion of the bearing, and thereafter, in the fixing step, the first axial direction is held while the rotation shaft is held. The locking member is fixed so as to come into contact with one end of the bearing. Thereafter, in the predetermined separation step, the first axial direction locking member or the second axial direction locking member is displaced with respect to the rotational axis by moving the rotational axis, and from the one end of the bearing or the other end of the bearing Are separated from each other by an amount corresponding to a predetermined range. Therefore, the rotor is set to be movable in a predetermined range in the axial direction with respect to the motor case.

  According to the ninth aspect of the present invention, in the contact step, the second axial locking member is brought into contact with the other end portion of the bearing, and in the predetermined separation step, the first shaft is held while the rotation shaft is held. The direction locking member is fixed so as to be separated from the one end of the bearing by an amount corresponding to a predetermined range. Therefore, the rotor is set to be movable in a predetermined range in the axial direction with respect to the motor case.

  According to the tenth aspect of the invention, in the fixing step, the first axial locking member is fixed so as to sandwich the jig corresponding to the predetermined range together with the bearing. Is removed from between the bearing and the first axial locking member. Therefore, the rotor is set to be movable in a predetermined range in the axial direction with respect to the motor case.

  According to the eleventh aspect of the invention, the predetermined separation and fixing step is performed while the distance between the first axial locking member and one end of the bearing is measured. Therefore, the rotor is set to be movable in a predetermined range in the axial direction with respect to the motor case.

  According to the twelfth aspect of the present invention, in the predetermined range setting step, at least one bearing is fixed by applying a load to the motor case from the outside of the motor case. Also, at this time, a collar that is fixed to the rotating shaft inside the motor case and abuts against one end of the bearing to restrict movement in the other axial direction, and a bearing that is fixed to the rotating shaft inside the motor case and other than the bearing. The rotor is set to be movable within a predetermined range in the axial direction with respect to the motor case by a commutator that restricts movement in one axial direction by contacting the end portion. Therefore, a predetermined range can be set from the outside of the motor case. Therefore, the rotor can be easily set so as to be movable within a predetermined range in the axial direction with respect to the motor case.

  According to the thirteenth aspect of the present invention, one bearing is fixed in the bearing fixing step, and then, in the contact step, the collar and the commutator are arranged so as to contact the bearing. Thereafter, in the predetermined separation step, the rotation shaft is moved and the collar or commutator is separated from one of the bearings by an amount corresponding to a predetermined range. Thereafter, in the bearing load fixing step, the other bearing is held while the rotation shaft is held. Fixed by applying a load. Therefore, the rotor is set to be movable in a predetermined range in the axial direction with respect to the motor case.

  As described above in detail, according to the first to fifth aspects of the present invention, it is possible to provide a motor capable of easily setting the rotor to be movable in a predetermined range in the axial direction with respect to the motor case. it can.

  Moreover, according to the invention of Claims 6-13, the manufacturing method of the motor which can set a rotor easily to a movable range to the axial direction with respect to a motor case can be provided.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. FIGS. 1A to 1D are views for explaining a motor manufacturing method, and FIG. 1D shows the completed motor. In FIGS. 1A to 1D, only one side (only the upper half in the drawing) of the motor constituent members other than the rotating shaft is shown with the rotating shaft as a boundary.

  The motor includes a yoke 1, a magnet 2, an end frame 3, a brush holder 4, first and second bearings 5 and 6, and a rotor 7. In this embodiment, the yoke 1 and the end frame 3 constitute a motor case. The motor case and the magnet 2 constitute a stator.

  As shown in FIG. 1 (d), the yoke 1 is formed in a substantially bottomed cylindrical shape, and a bearing holding portion 1a extending in a cylindrical shape along the axial direction is formed at the bottom. A magnet 2 is fixed to the inner peripheral surface of the yoke 1. The end frame 3 is formed in a disc shape, and a bearing holding portion 3a extending in a cylindrical shape along the axial direction is formed at the center thereof. The outer edge of the end frame 3 is fixed to the opening of the yoke 1. The brush holder 4 is fixed to the end frame 3 so as to be disposed in the motor case. The brush holder 4 holds the brush 8 and the like. The first and second bearings 5 and 6 are metal bearings and are formed in a substantially cylindrical shape. The first and second bearings 5 and 6 are fitted and fixed to the bearing holding portions 1a and 3a.

  The rotor 7 includes a rotating shaft 11, a commutator 12, an armature core 14 around which a winding 13 is wound, a collar 15, and a gear 16. In the present embodiment, the gear 16 constitutes a first axial locking member, and the collar 15 constitutes a second axial locking member.

  The rotating shaft 11 is rotatably supported by the first and second bearings 5 and 6. The commutator 12 is fixed to the rotating shaft 11 inside the motor case (the yoke 1 and the end frame 3). The commutator 12 is disposed on the second bearing 6 side (end frame 3 side), and the brush 8 is pressed and contacted with an outer peripheral surface (segment) thereof. The armature core 14 is fixed to the rotating shaft 11 inside the motor case (the yoke 1 and the end frame 3). The armature core 14 is disposed to face the magnet 2 on the first bearing 5 side (on the opposite end frame 3 side).

  The collar 15 is formed in a cylindrical shape, and is fixed (fitted) to the rotating shaft 11 outside the motor case (the yoke 1 and the end frame 3). The collar 15 is disposed on the first bearing 5 side (on the opposite end frame 3 side), and one end (the left end in FIG. 1) is the other end of the first bearing 5 (the right end in FIG. 1). The movement of the rotor 7 in one axial direction (left direction in FIG. 1) is restricted. In the present embodiment, a washer 17 that is externally fitted to the rotary shaft 11 so as to be movable in the axial direction is interposed between the first bearing 5 and the collar 15, and the collar 15 is indirectly connected to the first bearing 5. Therefore, the movement of the rotor 7 in one axial direction (left direction in FIG. 1) is restricted by contacting (via the washer 17). The washer 17 is made of a lubricating resin material.

  The gear 16 is a gear member for transmitting a rotational force to the outside, and is fixed to the rotary shaft 11 outside the motor case (the yoke 1 and the end frame 3). The gear 16 is disposed on the second bearing 6 side (end frame 3 side), and the other end (right end in FIG. 1) is in contact with one end of the second bearing 6 (left end in FIG. 1). By contacting, the movement of the rotor 7 in the other direction (right direction in FIG. 1) in the axial direction is restricted. In the present embodiment, a washer 18 that is externally fitted to the rotary shaft 11 so as to be movable in the axial direction is interposed between the second bearing 6 and the gear 16, and the gear 16 is indirectly connected to the second bearing 6. Therefore, the movement of the rotor 7 in the other axial direction (right direction in FIG. 1) is regulated by abutting (via the washer 18). The washer 18 is made of a lubricating resin material.

  The rotor 7 is movable in a predetermined range (a range corresponding to the gap S in FIG. 1C) with respect to the motor case (the yoke 1 and the end frame 3) by the collar 15 and the gear 16. Is set. The predetermined range is an optimal range in which vibration, noise, and torque loss are reduced.

Next, a method for manufacturing a motor configured as described above will be described.
First, as shown in FIG. 1A, members other than the collar 15, the gear 16, and the washers 17 and 18 are assembled. In the present embodiment, the first and second bearings 5 and 6 are fixed by being press-fitted (internally fitted) into the bearing holding portions 1a and 3a from the outside of the motor case.

  Next, as shown in FIGS. 1B to 1D, in the predetermined range setting step, the rotor 7 is set to be movable in a predetermined range in the axial direction with respect to the motor case by the collar 15 and the gear 16. . Specifically, the predetermined range setting process of the present embodiment includes a contact process, a predetermined separation process, and a fixing process.

  In the abutting step, as shown in FIG. 1B, the collar 15 and the washer 17 are assembled to the rotary shaft 11, and the collar 15 is attached to the other end of the first bearing 5 (in this embodiment, the washer 17 is attached). Through). In addition, the contact process of this Embodiment is performed in the state which received the one end part of the rotating shaft 11 with the latching jig 21, and controlled the movement of the rotating shaft 11 in one direction.

  Next, in the predetermined separation step, as shown in FIG. 1C, the rotary shaft 11 is moved to move the collar 15 from the other end of the first bearing 5 (the washer 17 in this embodiment) to a predetermined range. Separate by a corresponding amount (gap S).

  Next, in the fixing step, as shown in FIG. 1D, the gear 16 is brought into contact with one end portion of the second bearing 6 (in this embodiment, through the washer 18) while holding the rotating shaft 11. Secure to. In the present embodiment, the other end portion of the rotating shaft 11 is received by the locking jig 22 and the movement of the rotating shaft 11 in the other direction is restricted to hold the rotating shaft 11. Thereby, the rotor 7 is set to be movable in a predetermined range in the axial direction with respect to the motor case (the yoke 1 and the end frame 3).

Next, characteristic actions and effects of the first embodiment will be described below.
(1) The gear 16 that restricts the movement of the rotor 7 in the other axial direction (rightward in FIG. 1) by contacting the second bearing 6 is outside the motor case (the yoke 1 and the end frame 3). Since it is fixed to the rotating shaft 11, a predetermined range can be set from the outside of the motor case. Further, even if the predetermined range is shifted, it can be easily adjusted. Therefore, the rotor 7 can be easily set so as to be movable in a predetermined range in the axial direction with respect to the motor case. Further, since pressure is not applied to the bearing in the radial direction as in the prior art, there is no possibility that the bearing is deformed or the shaft center of the bearing is displaced, and the rotary shaft 11 is moved to the first and second bearings 5. , 6 can be favorably supported. Therefore, the vibration, noise, and torque loss can be further reduced as compared with the prior art.

  (2) The collar 15 that restricts the movement of the rotor 7 in one axial direction (leftward in FIG. 1) by contacting the first bearing 5 is outside the motor case (the yoke 1 and the end frame 3). Since it is fixed to the rotating shaft 11, the predetermined range can be set from the outside of the motor case by either the collar 15 or the gear 16.

  (3) A member (first axial locking member) that restricts the movement of the rotor 7 in the other axial direction (rightward in FIG. 1) by contacting the second bearing 6 is used to apply a rotational force to the outside. Since the transmission gear 16 (gear member) is used, the first axial locking member does not increase the number of parts.

(Second Embodiment)
Hereinafter, a second embodiment of the present invention will be described with reference to FIGS. FIGS. 2A to 2D are views for explaining a motor manufacturing method, and FIG. 2D shows the completed motor. 2A to 2D, only one side (only the upper half in the drawing) of the motor constituent members other than the rotating shaft is shown with the rotating shaft as a boundary. Further, since the motor of the second embodiment is only partially different from the motor of the first embodiment, the same parts are denoted by the same reference numerals and the description thereof is omitted. Only the different parts will be described.

  As shown in FIG. 2 (d), at the bottom of the yoke 1 of the present embodiment, instead of the bearing holding portion 1a of the first embodiment, a cylindrical portion 1b extending in a cylindrical shape along the axial direction. A bearing holding portion 1d is formed which includes a locking portion 1c extending radially inward from the tip of the cylindrical portion 1b. In addition, in the center of the end frame 3 of the present embodiment, instead of the bearing holding portion 3a of the first embodiment, a cylindrical portion 3b extending in a cylindrical shape along the axial direction and a tip of the cylindrical portion 3b A bearing holding portion 3d including a locking portion 3c extending inward in the radial direction is formed. Unlike the first and second bearings 5 and 6 of the first embodiment, the first and second bearings 31 and 32 of the present embodiment are different from those of the motor case (yoke 1 and end frame 3). The bearing holding portions 1d and 3d are fitted from the inside, and the retaining portion 3c prevents the outside from coming off.

  Further, the collar 15 and the washer 17 of the first embodiment are not provided, and the commutator 12 constitutes a second axial locking member. Specifically, the commutator 12 is formed by fixing a plurality of segments 12a in the circumferential direction on the outer periphery of a cylindrical insulating resin member (in the drawing, boundary lines divided into a plurality in the circumferential direction are not shown). A protruding portion 12b that protrudes in the axial direction from the segment 12a (can contact the other end portion of the second bearing 32) is integrally formed at one end portion of the insulating resin member. Then, the commutator 12 has one end portion (left end portion in FIG. 1) that is in contact with the other end portion (right end portion in FIG. 2) of the second bearing 32 so that the protrusion 12 b is in contact with the shaft of the rotor 7. The movement in one direction (left direction in FIG. 2) is restricted.

  The rotor 7 is movable in a predetermined range (a range corresponding to the gap S in FIG. 2D) with respect to the motor case (the yoke 1 and the end frame 3) by the commutator 12 and the gear 16. Is set.

Next, a method for manufacturing a motor configured as described above will be described.
First, as shown in FIG. 2A, members other than the gear 16 and the washer 18 are assembled.
Next, as shown in FIGS. 2B to 2D, in the predetermined range setting step, the commutator 12 and the gear 16 are used to set the rotor 7 to be movable in a predetermined range in the axial direction with respect to the motor case. . Specifically, the predetermined range setting process of the present embodiment includes a contact process, a fixing process, and a predetermined separation process.

In the contact step, as shown in FIG. 2B, the commutator 12 (protrusion 12 b) is brought into contact with the other end of the second bearing 32 (by moving the rotating shaft 11).
Next, in the fixing step, as shown in FIG. 2C, the gear 16 is brought into contact with one end portion of the second bearing 32 (in this embodiment, through the washer 18) while holding the rotating shaft 11. Secure to. In the present embodiment, the other end portion of the rotating shaft 11 is received by the locking jig 22 and the movement of the rotating shaft 11 in the other direction is restricted to hold the rotating shaft 11.

  Next, in the predetermined separation step, as shown in FIG. 2 (d), the commutator 12 is moved to the rotating shaft 11 (gear 16) by moving the rotating shaft 11 (to one of the axial directions (leftward in the figure)). The gear 16 is separated from the one end of the second bearing 32 by an amount corresponding to a predetermined range (gap S). Thereby, the rotor 7 is set to be movable in a predetermined range in the axial direction with respect to the motor case (the yoke 1 and the end frame 3).

Next, the characteristic operational effects of the second embodiment will be described below.
(1) The gear 16 that restricts the movement of the rotor 7 in the other axial direction (right direction in FIG. 2) by contacting the second bearing 32 is outside the motor case (the yoke 1 and the end frame 3). Since it is fixed to the rotating shaft 11, a predetermined range can be set from the outside of the motor case. Further, even if the predetermined range is shifted, it can be easily adjusted. Therefore, the rotor 7 can be easily set so as to be movable in a predetermined range in the axial direction with respect to the motor case. Further, since pressure is not applied to the bearing in the radial direction as in the prior art, there is no possibility that the bearing is deformed or the shaft center of the bearing is shifted, and the rotary shaft 11 is moved to the first and second bearings 31. , 32 can be supported well. Therefore, the vibration, noise, and torque loss can be further reduced as compared with the prior art.

  (2) Since the commutator 12 is a member (second axial locking member) that restricts movement of the rotor 7 in one axial direction (left direction in FIG. 2) by contacting the second bearing 32, The second axial locking member does not increase the number of parts.

  (3) The commutator 12 is formed by fixing a plurality of segments 12a in the circumferential direction on the outer periphery of a cylindrical insulating resin member, and protrudes from the segment 12a in the axial direction at one end of the insulating resin member ( A protruding portion 12b (which can abut against the other end portion of the second bearing 32) is formed. If it does in this way, since the segment 12a does not contact the 2nd bearing 32, the function of the commutator 12 is ensured. In addition, since the second bearing 32 and the segment 12a are separated from each other in the axial direction, adhesion of the lubricating oil of the second bearing 32 to the segment 12a is reduced.

  (4) A member (first axial locking member) that restricts the movement of the rotor 7 in the other axial direction (rightward in FIG. 2) by contacting the second bearing 32 is used to apply a rotational force to the outside. Since the transmission gear 16 (gear member) is used, the first axial locking member does not increase the number of parts.

(Third embodiment)
A third embodiment embodying the present invention will be described below with reference to FIGS. FIGS. 3A to 3D are views for explaining a motor manufacturing method, and FIG. 3D shows the completed motor. 3A to 3D, only one side (only the upper half in the figure) of the motor constituent members other than the rotating shaft is shown with the rotating shaft as a boundary. The motor according to the third embodiment is substantially the same as the motor according to the second embodiment. Therefore, the same reference numerals are used and description thereof is omitted, and the motor manufacturing method configured as described above is used. Will be described.

First, as shown in FIG. 3A, members excluding the gear 16 and the washer 18 are assembled.
Next, as shown in FIGS. 3B to 3D, in the predetermined range setting step, the rotor 7 is set so as to be movable in the axial direction with respect to the motor case by the commutator 12 and the gear 16. . Specifically, the predetermined range setting process of the present embodiment includes a contact process and a predetermined separation fixing process.

In the contact step, as shown in FIG. 3B, the commutator 12 (protrusion 12 b) is brought into contact with the other end of the second bearing 32 (by moving the rotating shaft 11).
Next, in the predetermined separation and fixing step, as shown in FIGS. 3C and 3D, the gear 16 is separated from one end of the second bearing 32 in correspondence with a predetermined range while holding the rotating shaft 11. It is fixed so as to be separated (by the gap S) (through the washer 18 in this embodiment). Specifically, the predetermined separation fixing process of the present embodiment includes a fixing process and a jig removing process.

  In the fixing step, as shown in FIG. 3 (c), the gear 41 is sandwiched between the second bearing 32 and the jig 41 corresponding to the predetermined range (gap S) (through the washer 18 in this embodiment). 16 is fixed. This step is performed while holding the rotating shaft 11 by receiving the other end of the rotating shaft 11 with the locking jig 22 and restricting the movement of the rotating shaft 11 in the other direction.

  Next, in the jig removing step, the jig 41 is removed from between the second bearing 32 (washer 18) and the gear 16 as shown in FIG. Thereby, the rotor 7 is set to be movable in a predetermined range in the axial direction with respect to the motor case (the yoke 1 and the end frame 3).

Also in the third embodiment, the same operational effects as the characteristic operational effects of the second embodiment can be obtained.
(Fourth embodiment)
Hereinafter, a fourth embodiment embodying the present invention will be described with reference to FIGS. FIGS. 4A to 4D are views for explaining a motor manufacturing method, and FIG. 4D shows the completed motor. 4A to 4D, only one side (only the upper half in the figure) of the motor constituent members other than the rotating shaft is shown with the rotating shaft as a boundary. The motor according to the fourth embodiment is substantially the same as the motor according to the second and third embodiments. Therefore, the same reference numerals are used and the description thereof is omitted, and the motor is configured as described above. The manufacturing method will be described.

First, as shown in FIG. 4A, members other than the gear 16 and the washer 18 are assembled.
Next, as shown in FIGS. 4B to 4D, in the predetermined range setting process, the commutator 12 and the gear 16 set the rotor 7 so as to be movable in a predetermined range in the axial direction with respect to the motor case. . Specifically, the predetermined range setting process of the present embodiment includes a contact process and a predetermined separation fixing process.

In the contact step, as shown in FIG. 4B, the commutator 12 (protrusion 12 b) is brought into contact with the other end of the second bearing 32 (by moving the rotating shaft 11).
Next, in the predetermined separation and fixing step, as shown in FIGS. 4C and 4D, the gear 16 is moved from the one end of the second bearing 32 to a predetermined range while holding the rotating shaft 11. It is fixed so as to be separated (by the gap S) (through the washer 18 in this embodiment).

  The predetermined spacing and fixing step of the present embodiment is performed while measuring the distance between the gear 16 and one end of the second bearing 32. Further, this process is performed while holding the rotating shaft 11 by receiving the other end of the rotating shaft 11 with the locking jig 22 and restricting the movement of the rotating shaft 11 in the other direction. Specifically, in the present embodiment, first, the axial length X of the gear 16 is measured. Next, the washer 18 is assembled (externally fitted) to the rotating shaft 11 and brought into contact with one end of the second bearing 32, and the position Y of one end surface of the washer 18 (the left end surface in FIG. 4C). Is detected. Next, while measuring the gear 16 so that one end face (left end face in the figure) is a position obtained by adding a predetermined range (gap S) from the position Y to the axial length X, the gear 16 is rotated on the rotating shaft 11. Fix (press-fit) to. Thereby, the rotor 7 is set to be movable in a predetermined range in the axial direction with respect to the motor case (the yoke 1 and the end frame 3).

Also in the fourth embodiment, it is possible to obtain the same operational effects as the characteristic operational effects of the second embodiment.
(Fifth embodiment)
Hereinafter, a fifth embodiment of the present invention will be described with reference to FIGS. FIGS. 5A to 5D are views for explaining a motor manufacturing method, and FIG. 5D shows the completed motor. 5A to 5D, only one side (only the upper half in the figure) of the motor constituent members other than the rotating shaft is shown with the rotating shaft as a boundary. Further, since the motor of the fifth embodiment is only partially different from the motor of the second embodiment, the same parts are denoted by the same reference numerals and the description thereof is omitted. Only the different parts will be described.

  As shown in FIG. 5D, the second bearing 51 of the present embodiment is different from the second bearing 32 of the second embodiment in that an annular groove 51a coaxial with the rotating shaft 11 is formed. Yes. The annular groove 51a is recessed from the one axial end side (left side in FIG. 5) to the axial other end side beyond the axial central portion. Then, the second bearing 51 is fitted into the motor case (bearing holding portion 3d) from the outside of the motor case in a state of being fitted into the bearing holding portion 3d from the inside of the motor case (yoke 1 and end frame 3). It is fixed by applying a load (inward in the direction).

  Further, the rotor 7 of the present embodiment includes a collar 52. The collar 52 is fixed to the rotary shaft 11 inside the motor case and abuts against one end portion of the first bearing 31 to restrict movement of the rotor 7 in the other direction (right direction in FIG. 5) in the axial direction. The collar 52 is set so as to protrude from the winding 13 to the first bearing 31 side. Further, the washer 18 of the second embodiment is omitted.

  The rotor 7 is movable in a predetermined range (a range corresponding to the gap S in FIG. 5B) with respect to the motor case (the yoke 1 and the end frame 3) by the commutator 12 and the collar 52. Is set.

Next, a method for manufacturing a motor configured as described above will be described.
In the predetermined range setting process of the present embodiment, the second bearing 51 is moved to the motor so that the rotor 7 is set to be movable in the predetermined range in the axial direction with respect to the motor case by the collar 52 and the commutator 12. The motor case (bearing holding portion 3d) is fixed by applying a load (inward in the radial direction) from the outside of the case. Specifically, the predetermined range setting process of the present embodiment includes a bearing fixing process, a contact process, a predetermined separation process, and a bearing load fixing process.

  First, in the bearing fixing step, the first bearing 31 is fixed to the bearing holding portion 1d (by press-fitting, adhesive, or the like). Next, the members excluding the gear 16 are temporarily assembled. At this time, the second bearing 51 is loosely fitted to the bearing holding portion 3d so as to be movable in the axial direction (see FIG. 5A).

Next, in the contact step, as shown in FIG. 5A, the collar 52 and the commutator 12 are disposed so as to contact the first and second bearings 31 and 51.
Next, in the predetermined separation step, as shown in FIG. 5B, the rotary shaft 11 is moved to separate the collar 52 from the first bearing 31 by an amount corresponding to a predetermined range (gap S). At this time, the second bearing 51 is moved together with the commutator 12 by an amount corresponding to a predetermined range (gap S).

  Next, in the bearing load fixing step, as shown in FIG. 5C, the second bearing 51 is moved from the outside of the motor case to the motor case (bearing holding portion) while holding the rotating shaft 11 (in that state). Fix by applying a load (inward in the radial direction) to 3d). Thereby, the rotor 7 is set to be movable in a predetermined range in the axial direction with respect to the motor case (the yoke 1 and the end frame 3).

  Then, as shown in FIG. 5 (d), the gear 16 is separated from the one end portion of the second bearing 51 by an amount corresponding to a predetermined range (gap S) or more while holding the rotating shaft 11. To fix. In the present embodiment, the other end portion of the rotating shaft 11 is received by the locking jig 22 and the movement of the rotating shaft 11 in the other direction is restricted to hold the rotating shaft 11.

Next, characteristic actions and effects of the fifth embodiment will be described below.
(1) The rotor 7 is set to be movable in a predetermined range in the axial direction with respect to the motor case by the collar 52 and the commutator 12. Since the second bearing 51 is fixed by applying a load to the motor case (bearing holding portion 3d) from the outside of the motor case, a predetermined range can be set from the outside of the motor case. Therefore, the rotor 7 can be easily set so as to be movable in a predetermined range in the axial direction with respect to the motor case.

(2) Since the commutator 12 is used as the member that restricts the movement of the rotor 7 in one axial direction (leftward in FIG. 5) by contacting the second bearing 51, the number of parts does not increase.
(3) The commutator 12 is formed by fixing a plurality of segments 12a in the circumferential direction on the outer periphery of a cylindrical insulating resin member, and protrudes from the segment 12a in the axial direction at one end of the insulating resin member ( A protruding portion 12b (which can abut against the other end portion of the second bearing 51) is formed. If it does in this way, since the segment 12a does not contact the 2nd bearing 51, the function of the commutator 12 is ensured. In addition, since the second bearing 51 and the segment 12a are separated from each other in the axial direction, the lubricating oil of the second bearing 51 is reduced from adhering to the segment 12a.

  (4) The second bearing 51 fixed by applying a load is a metal bearing, and is formed with an annular groove 51a coaxial with the rotating shaft (because the annular groove 51a absorbs deformation in the radially outer side). ), The inner peripheral surface is prevented from being deformed by the load. Therefore, the rotating shaft 11 can be favorably supported. That is, an increase in vibration, noise and torque loss can be suppressed.

The above embodiment may be modified as follows.
In the first to fourth embodiments described above, the member that restricts the movement of the rotor 7 in the other axial direction (right direction in the drawing) by contacting the second bearings 6 and 32 (bearings) Although the gear 16 (gear member) for transmitting the rotational force to the outside is used as the one axial locking member), it may be changed to another first axial locking member such as a collar.

  In the second to fourth embodiments, a member (second shaft) that restricts movement of the rotor 7 in one axial direction (leftward in the figure) by contacting the second bearing 32 (bearing). Although the direction locking member is the commutator 12, it may be changed to another second axial direction locking member such as a collar. Further, the second axial locking member may be integrally formed with the rotary shaft by changing the diameter of the rotary shaft 11 (forming a step) (that is, the rotary shaft itself is related to the second axial direction). It may also be used as a stop member).

-You may implement by abbreviate | omitting the washers 17 and 18 in the said 1st-4th embodiment.
In each of the above embodiments, the yoke 1 and the end frame 3 constitute a motor case, but may be changed to a motor case having another configuration.

  In each of the above embodiments, the motor case (the yoke 1 and the end frame 3) and the magnet 2 constitute the stator. However, the stator may be changed to another configuration such as one having a winding.

  In each of the above embodiments, the rotor 7 is for a DC motor provided with the winding 13 or the like, but may be changed to a brushless motor provided with a magnet. In this case, of course, it is necessary to change the stator to that for a brushless motor (such as one having a winding), or to change the second axial locking member from the commutator 12 to another. That is, the present invention may be embodied in a brushless motor.

  In the fifth embodiment, the second bearing 51 is formed with the annular groove 51a coaxial with the rotating shaft, but the bearing is not formed with the annular groove 51a (second bearing 32). May be.

The technical idea that can be grasped from the above embodiments will be described below together with the effects thereof.
(A) In the motor according to claim 2, the commutator is formed by fixing a plurality of segments in the circumferential direction on the outer periphery of the insulating resin member, and the shaft extends from the segment to one end of the insulating resin member. A motor characterized in that a protrusion is formed that protrudes in the direction and abuts against the other end of the bearing. In this case, since the segment does not contact the bearing, the function of the commutator is ensured. In addition, since the bearing and the segment are separated from each other in the axial direction, adhesion of the lubricating oil of the bearing to the segment is reduced.

  (B) In the motor according to any one of claims 1 to 3 and (A), the first axial locking member is a gear member for transmitting a rotational force to the outside. Motor. If it does in this way, since a 1st axial direction locking member is a gear member for transmitting rotational force outside, the number of parts does not increase.

(A)-(d) The figure for demonstrating the manufacturing method of the motor of 1st Embodiment. (A)-(d) The figure for demonstrating the manufacturing method of the motor of 2nd Embodiment. (A)-(d) The figure for demonstrating the manufacturing method of the motor of 3rd Embodiment. (A)-(d) The figure for demonstrating the manufacturing method of the motor of 4th Embodiment. (A)-(d) The figure for demonstrating the manufacturing method of the motor of 5th Embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Yoke which comprises a part of motor case, 3 ... End frame which comprises a part of motor case, 5, 31 ... 1st bearing (bearing), 6, 32, 51 ... 2nd bearing (bearing), 7 ... rotor, 11 ... rotating shaft, 12 ... commutator (second axial locking member), 15 ... collar (second axial locking member), 16 ... gear (first axial locking member), 41 ... Tool, 51a ... annular groove, 52 ... collar.

Claims (13)

A motor case with bearings fixed at both ends in the axial direction;
A motor having a rotating shaft supported rotatably by the bearing and having a rotor movable in a predetermined range in an axial direction with respect to the motor case;
The rotor is
A first axial locking member that restricts movement in the other axial direction by contacting the one end of the bearing, and a movement in one axial direction by contacting the other end of the bearing A second axial locking member, and set by the first and second axial locking members to be movable in a predetermined range in the axial direction with respect to the motor case,
The motor according to claim 1, wherein the first axial locking member is fixed to the rotary shaft outside the motor case. The motor according to claim 1,
The motor, wherein the second axial locking member is a commutator fixed to the rotating shaft inside the motor case. The motor according to claim 1,
The motor, wherein the second axial locking member is fixed to the rotating shaft outside the motor case. A motor case with bearings fixed at both ends in the axial direction;
A motor having a rotating shaft supported rotatably by the bearing and having a rotor movable in a predetermined range in an axial direction with respect to the motor case;
The rotor is
A collar that is fixed to the rotating shaft inside the motor case and that restricts movement in the other axial direction by abutting against one end of the bearing, and fixed to the rotating shaft inside the motor case. A commutator that regulates movement in one axial direction by contacting the other end, and is set to be movable in a predetermined range in the axial direction with respect to the motor case by the collar and the commutator,
The motor, wherein at least one of the bearings is fixed by applying a load to the motor case from the outside of the motor case. The motor according to claim 4,
The motor fixed by applying a load is a metal bearing, and an annular groove coaxial with the rotary shaft is formed. A motor manufacturing method in which bearings are fixed to both ends of a motor case in the axial direction, a rotating shaft of a rotor is rotatably supported by the bearing, and the rotor is movable in a predetermined range in the axial direction with respect to the motor case. Because
A first axial locking member fixed to the rotating shaft outside the motor case and contacting one end of the bearing to restrict movement in the other axial direction; and fixed to the rotating shaft and fixed to the bearing A predetermined setting that allows the rotor to move in a predetermined range in the axial direction with respect to the motor case by a second axial locking member that restricts movement in one axial direction by contacting the other end. A motor manufacturing method comprising a range setting step. In the manufacturing method of the motor according to claim 6,
The predetermined range setting step includes
An abutting step of abutting the second axial locking member with the other end of the bearing;
After the abutting step, a predetermined separating step of moving the rotating shaft to separate the second axial locking member from the other end of the bearing by an amount corresponding to the predetermined range;
And a fixing step of fixing the first axial locking member so as to abut against one end of the bearing while holding the rotating shaft after the predetermined separation step. . In the manufacturing method of the motor according to claim 6,
The predetermined range setting step includes
An abutting step of abutting the second axial locking member with the other end of the bearing;
After the abutting step, a fixing step of fixing the first axial locking member so as to abut one end of the bearing while holding the rotating shaft;
After the fixing step, by moving the rotating shaft, one of the first and second axial locking members is displaced with respect to the rotating shaft, and the first and second axial locking members are moved. And a predetermined separation step of separating the other of the bearings from one end of the bearing or from the other end of the bearing by an amount corresponding to the predetermined range. In the manufacturing method of the motor according to claim 6,
The predetermined range setting step includes
An abutting step of abutting the second axial locking member with the other end of the bearing;
After the abutting step, a predetermined separation fixing step for fixing the first axial locking member so as to be separated from the one end portion of the bearing by an amount corresponding to the predetermined range while holding the rotating shaft. A method for manufacturing a motor, comprising: In the manufacturing method of the motor according to claim 9,
The predetermined separation fixing step includes
A fixing step of fixing the first axial locking member so as to sandwich a jig corresponding to the predetermined range together with the bearing;
A method of manufacturing a motor, comprising: a jig removing step of removing the jig from between the bearing and the first axial locking member after the fixing step. In the manufacturing method of the motor according to claim 9,
The predetermined separation fixing step includes
A method for manufacturing a motor, comprising measuring a distance between the first axial locking member and one end of the bearing. A motor manufacturing method in which bearings are fixed to both ends of a motor case in the axial direction, a rotating shaft of a rotor is rotatably supported by the bearing, and the rotor is movable in a predetermined range in the axial direction with respect to the motor case. Because
A collar that is fixed to the rotating shaft inside the motor case and that restricts movement in the other axial direction by abutting against one end of the bearing, and fixed to the rotating shaft inside the motor case. At least one of the aforesaid rotors is set so as to be movable within a predetermined range in the axial direction with respect to the motor case by a commutator that restricts movement in one axial direction by contacting the other end. A method for manufacturing a motor, comprising a predetermined range setting step of fixing a bearing by applying a load to the motor case from the outside of the motor case. In the manufacturing method of the motor according to claim 12,
The predetermined range setting step includes
A bearing fixing step of fixing one of the bearings;
An abutting step of arranging the collar and the commutator so as to abut against the bearing after the bearing fixing step;
A predetermined separation step of moving the rotation shaft after the abutting step to separate the collar or the commutator from one of the bearings by an amount corresponding to the predetermined range;
And a bearing load fixing step of fixing the other bearing by applying a load while holding the rotating shaft after the predetermined separation step.

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