JP6066686B2 - Motor device and motor device assembly method - Google Patents

Description

  The present invention relates to a motor device that outputs a driving force of a motor.

  The motor with a speed reduction mechanism disclosed in Patent Document 1 below is output after the rotation of the rotating shaft is decelerated by a speed reduction mechanism including a worm wheel meshing with the worm. As the worm and the worm wheel mesh, a thrust load acts on the rotating shaft as a reaction force. In particular, in the case where the rotating shaft rotates forward and backward, this thrust load acts on both shaft ends, that is, both shaft ends of the rotating shafts on the gear housing side and the yoke housing side. Therefore, the thrust load at both shaft ends of the rotating shaft is supported by a thrust bearing structure using a steel ball and a metal thrust plate, respectively.

  Also, if there is a clearance between the end face of the rotating shaft and the thrust plate, they collide with each other and an abnormal noise is generated. In particular, when forward and reverse rotation occurs, the direction of rotation of the rotating shaft changes, so that the direction of thrust load action also changes, and the occurrence of the abnormal noise becomes significant.

  In order to prevent the generation of this noise, in the thrust bearing structure on the gear housing side, the rotating shaft housing chamber provided in the gear housing and the injection space are partitioned by a thrust plate, and the molten resin material is injected into the injection space and cured. The clearance of the rotating shaft is adjusted by the thermal contraction of the resin material.

JP2011-30346A

  By the way, when the thrust plate is disposed in the thrust plate housing portion, the thrust plate is disposed from the worm housing portion side in the thrust plate housing portion formed in a deep and narrow place located further on the axial end side of the worm housing portion. Must-have. For this reason, it is difficult to properly maintain the posture of the thrust plate until the thrust plate is disposed in the thrust plate housing portion.

  In view of the above facts, the present invention has an object to obtain a motor device and a method of assembling the motor device that can easily arrange a plate in pressure contact with the thrust bearing from the opposite side of the rotor shaft in the thrust bearing in an appropriate posture. is there.

A motor device according to a first aspect of the present invention includes a motor having a rotor that rotates around a rotor shaft when energized, a housing that houses the rotor shaft, and a radial bearing housing portion formed in the housing. A radial bearing that is inserted in the axial direction of the rotor shaft and has a bearing hole into which one axial end side of the rotor shaft enters, and that rotatably supports the rotor shaft that has entered the bearing hole, and the rotor The radial bearing accommodating portion and the plate accommodating portion that are at least partially inserted into the plate accommodating portion formed in the housing so as to communicate with the radial bearing accommodating portion in the axial direction of the shaft and communicate with each other. A space is partitioned between the radial bearing housing portion side and the opposite side in the axial direction of the rotor shaft, and a plate movable in the axial direction, A thrust bearing that contacts the rotor shaft on the radial bearing housing portion side of the plate and receives an axial force on the rotor shaft, and communicates with the plate housing portion on the opposite side of the radial bearing housing portion with respect to the plate The filled resin material filled in the filled resin portion and the plate bearing portion side end portion of the radial bearing formed so as to be able to hold the plate in a predetermined posture and perpendicular to the axial direction of the rotor shaft The plate abuts against the outer peripheral portion of the plate to suppress displacement of the plate, and the radial bearing is inserted and fixed to the radial bearing housing portion so that at least a part of the plate enters the plate housing portion. And a plate holding part for holding the plate.

  In the motor device according to the first aspect of the present invention, a radial bearing housing portion is formed in a housing in which the rotor shaft of the motor is housed, and the rotor shaft is inserted into the bearing hole of the radial bearing inserted into the radial bearing housing portion. One end side in the axial direction enters. Thereby, the axial direction one end side of a rotor shaft is rotatably supported by a radial bearing.

  In addition, a plate accommodating portion is formed in the housing. The plate housing portion communicates with the radial bearing housing portion in the axial direction of the rotor shaft. A plate is provided inside the plate housing portion so as to be movable in the axial direction of the rotor shaft. A space formed by the radial bearing housing portion and the plate housing portion that are in communication with each other is partitioned by the plate into the radial bearing housing portion side and the opposite side in the axial direction of the rotor shaft.

  Further, a resin filling portion is formed in the housing. The resin filling portion communicates with the plate housing portion on the side opposite to the radial bearing housing portion with respect to the plate. The resin filling portion is filled with a molten filling resin material and the plate is pressed against the radial bearing housing portion side. Is done. Since the thrust bearing is provided on the radial bearing housing portion side of the plate, the thrust bearing is also pressed. And the axial backlash adjustment in a rotor axis | shaft is appropriately performed by the thermal contraction accompanying the cooling hardening of the filling resin material after filling.

  Here, a plate holding portion is formed at the end of the radial bearing, and the plate is held in a predetermined posture by the plate holding portion, and the radial bearing holding the plate is in the radial direction of the rotor shaft. Inserted and fixed to the housing. Then, when the radial bearing is fixed to the radial bearing housing portion, the plate posture reaches the plate housing portion while maintaining an appropriate posture, and a part of the plate enters the plate housing portion to facilitate the plate posture in an appropriate state. Can be assembled to.

  For this reason, in assembling the motor device, the plate can be easily inserted into the plate housing portion.

In the motor device according to the present invention, the plate holding portion is formed at the end of the radial bearing on the plate housing portion side. The plate holding portion is in contact with the outer peripheral portion of the plate to hold the plate and suppress displacement of the plate in a direction orthogonal to the axial direction of the rotor shaft. For this reason, it is possible to position and hold the plate in this plate holding portion in a predetermined posture, and prevent the position and posture of the plate from being inadvertently shifted when the radial bearing is inserted into the radial bearing housing portion. it can. Thereby, when assembling this motor apparatus, a plate can be easily made into a plate accommodating part.

  In the present invention, the plate holding portion may have an annular shape that is continuous in the outer peripheral direction of the plate, or may be configured to be formed intermittently in the outer peripheral direction of the plate.

A motor device according to a second aspect of the present invention includes a motor having a rotor that rotates around a rotor shaft when energized, a housing that houses the rotor shaft, and a radial bearing housing portion formed in the housing. A radial bearing that is inserted in the axial direction of the rotor shaft and has a bearing hole into which one axial end side of the rotor shaft enters, and that rotatably supports the rotor shaft that has entered the bearing hole, and the rotor The radial bearing accommodating portion and the plate accommodating portion that are at least partially inserted into the plate accommodating portion formed in the housing so as to communicate with the radial bearing accommodating portion in the axial direction of the shaft and communicate with each other. A space is partitioned between the radial bearing housing portion side and the opposite side in the axial direction of the rotor shaft, and a plate movable in the axial direction, A thrust bearing that contacts the rotor shaft on the radial bearing housing portion side of the plate and receives an axial force on the rotor shaft, and communicates with the plate housing portion on the opposite side of the radial bearing housing portion with respect to the plate A filled resin material filled in the resin filling portion, and formed at the tip of the radial bearing so as to be able to hold the plate in a predetermined posture, and at least the plate is inserted and fixed in the radial bearing housing portion of the radial bearing. together with a part to hold the plate so as to enter into the plate receiving portion, wherein the plate is configure to include the bottom in contact with the axial end surface of said rotor shaft in said plate while being held, the radial In the state where the radial bearing is inserted into the bearing housing portion, the radial bearing housing portion side of the plate housing portion Interval L4 along the axial direction of the rotor axis from the open end to the bottom, provided with a plate holder, which is set to be less than the dimension D1 in the axial direction of the rotor axis in the plate Yes.

Motor equipment in accordance with the invention as claimed in claim 2, the housing in which the rotor shaft of the motor is housed is formed radial bearing accommodating portion, the rotor into the bearing hole of the radial bearing that is inserted into the radial bearing receptacle One axial end of the shaft enters. Thereby, the axial direction one end side of a rotor shaft is rotatably supported by a radial bearing.
In addition, a plate accommodating portion is formed in the housing. The plate housing portion communicates with the radial bearing housing portion in the axial direction of the rotor shaft. A plate is provided inside the plate housing portion so as to be movable in the axial direction of the rotor shaft. A space formed by the radial bearing housing portion and the plate housing portion that are in communication with each other is partitioned by the plate into the radial bearing housing portion side and the opposite side in the axial direction of the rotor shaft.
Further, a resin filling portion is formed in the housing. The resin filling portion communicates with the plate housing portion on the side opposite to the radial bearing housing portion with respect to the plate. The resin filling portion is filled with a molten filling resin material and the plate is pressed against the radial bearing housing portion side. Is done. Since the thrust bearing is provided on the radial bearing housing portion side of the plate, the thrust bearing is also pressed. And the axial backlash adjustment in a rotor axis | shaft is appropriately performed by the thermal contraction accompanying the cooling hardening of the filling resin material after filling.
Here, a plate holding portion is formed at the end of the radial bearing, and the plate is held in a predetermined posture by the plate holding portion, and the radial bearing holding the plate is in the radial direction of the rotor shaft. Inserted and fixed to the housing. Then, when the radial bearing is fixed to the radial bearing housing portion, the plate posture reaches the plate housing portion while maintaining an appropriate posture, and a part of the plate enters the plate housing portion to facilitate the plate posture in an appropriate state. Can be assembled to.
For this reason, in assembling the motor device, the plate can be easily inserted into the plate housing portion.
Further, in the motor device according to the present invention, the plate holding portion has a bottom portion, and the bottom portion comes into contact with the axial end surface of the rotor shaft in the plate in a state where the plate holding portion holds the plate. For this reason, it is possible to easily hold the plate on the plate holding section simply by placing the plate on the bottom with the bottom facing vertically upward.

  In the state where the radial bearing is inserted in the radial bearing housing portion, the distance L4 along the axial direction of the rotor shaft from the opening end on the radial bearing housing portion side to the bottom portion of the plate holding portion in the plate housing portion is the rotor shaft in the plate. Each dimension of the radial bearing, the plate, the radial bearing accommodating part, the plate accommodating part, etc. is set so as to be less than the dimension along the axial direction.

  For this reason, if a radial bearing is inserted and fixed in a radial bearing accommodating part, a part by the side of the plate accommodating part in a plate will enter into a plate accommodating part. In this state, both ends of the plate along the axial direction of the rotor shaft are held by the plate holding portion and the plate housing portion. Accordingly, the plate can be stabilized in a predetermined posture before the resin filling portion is filled with the filled resin material.

According to a third aspect of the present invention, there is provided a motor device having a rotor that rotates around a rotor shaft when energized, a housing that houses the rotor shaft, and a radial bearing housing portion formed in the housing. A radial bearing that is inserted in the axial direction of the rotor shaft and has a bearing hole into which one axial end side of the rotor shaft enters, and that rotatably supports the rotor shaft that has entered the bearing hole, and the rotor The radial bearing accommodating portion and the plate accommodating portion that are at least partially inserted into the plate accommodating portion formed in the housing so as to communicate with the radial bearing accommodating portion in the axial direction of the shaft and communicate with each other. A space is partitioned between the radial bearing housing portion side and the opposite side in the axial direction of the rotor shaft, and a plate movable in the axial direction, A thrust bearing that is formed in a spherical shape whose size is larger than the inner diameter size of the bearing hole, and that receives axial force on the rotor shaft in contact with the rotor shaft on the radial bearing housing portion side of the plate; A thrust bearing housing portion that is formed in a radial bearing and communicates with the bearing hole and is open at an end opposite to the bearing hole to receive the thrust bearing; and the radial bearing housing with respect to the plate The radial bearing of the radial bearing is formed at a distal end of the radial bearing so as to be able to hold the plate in a predetermined posture, and a filled resin material filled in a resin filling portion communicating with the plate housing portion on the opposite side of the portion A plate holding portion for holding the plate so that at least a part of the plate enters the plate housing portion in a state of being fixedly inserted into the housing portion; It is equipped with a.

Motor equipment in accordance with the invention as claimed in claim 3, the housing in which the rotor shaft of the motor is housed is formed radial bearing accommodating portion, the rotor into the bearing hole of the radial bearing that is inserted into the radial bearing receptacle One axial end of the shaft enters. Thereby, the axial direction one end side of a rotor shaft is rotatably supported by a radial bearing.
In addition, a plate accommodating portion is formed in the housing. The plate housing portion communicates with the radial bearing housing portion in the axial direction of the rotor shaft. A plate is provided inside the plate housing portion so as to be movable in the axial direction of the rotor shaft. A space formed by the radial bearing housing portion and the plate housing portion that are in communication with each other is partitioned by the plate into the radial bearing housing portion side and the opposite side in the axial direction of the rotor shaft.
Further, a resin filling portion is formed in the housing. The resin filling portion communicates with the plate housing portion on the side opposite to the radial bearing housing portion with respect to the plate. The resin filling portion is filled with a molten filling resin material and the plate is pressed against the radial bearing housing portion side. Is done. Since the thrust bearing is provided on the radial bearing housing portion side of the plate, the thrust bearing is also pressed. And the axial backlash adjustment in a rotor axis | shaft is appropriately performed by the thermal contraction accompanying the cooling hardening of the filling resin material after filling.
Here, a plate holding portion is formed at the end of the radial bearing, and the plate is held in a predetermined posture by the plate holding portion, and the radial bearing holding the plate is in the radial direction of the rotor shaft. Inserted and fixed to the housing. Then, when the radial bearing is fixed to the radial bearing housing portion, the plate posture reaches the plate housing portion while maintaining an appropriate posture, and a part of the plate enters the plate housing portion to facilitate the plate posture in an appropriate state. Can be assembled to.
For this reason, in assembling the motor device, the plate can be easily inserted into the plate housing portion.
According to the motor device of the present invention, the thrust bearing is formed in a spherical shape having an outer diameter dimension larger than the inner diameter dimension of the bearing hole formed in the radial bearing. Further, in the motor device according to the present invention, the thrust bearing housing portion is formed in the radial bearing. The thrust bearing housing portion communicates with the bearing hole and opens on the side opposite to the bearing hole, and the thrust bearing can be housed in the thrust bearing housing portion from the opening.

  By the way, in the structure disclosed by patent document 1, until a molten resin material is inject | poured, it is between a thrust plate and a thrust plate so that a steel ball may not fall from the recessed part formed in the front end surface of a rotating shaft. The state accommodated in the recess must be maintained. That is, there is a problem in that the steel ball falls off without being held unless the rotating shaft is maintained in the gear housing. In addition, since the steel ball is accommodated in the recess of the rotating shaft, there is a problem that the rotating shaft needs to have a diameter larger than the diameter of the steel ball.

  On the other hand, as described above, the thrust bearing of the motor device according to the present invention has a spherical shape whose outer diameter is larger than the inner diameter of the bearing hole formed in the radial bearing. For this reason, the thrust bearing accommodated in the thrust bearing accommodating portion does not pass through the bearing hole of the radial bearing. Thus, when the motor device is assembled, the radial bearing is inserted and fixed in the radial bearing housing portion so that the thrust bearing housed in the thrust bearing housing portion is thrust from the thrust bearing housing portion even when the rotor shaft is not assembled. Since the bearing does not fall off, the assembly work is easy.

  Moreover, the thrust bearing is configured to be held in a thrust bearing housing portion formed in the radial bearing. For this reason, the rotor shaft can be made thinner than the thrust bearing.

A motor device according to a fourth aspect of the present invention is the motor device according to the third aspect , wherein the thrust bearing is located at a position closest to the bearing hole in the thrust bearing housing portion, and the center of the thrust bearing is provided. The distance L1 from the plate to the plate held by the plate holding part is set to be larger than the radial dimension R of the thrust bearing.

In the motor device according to the fourth aspect of the present invention, the distance from the center of the thrust bearing to the plate held by the plate holding portion in a state where the thrust bearing is located closest to the bearing hole in the thrust bearing housing portion. The dimensions of the radial bearing and the thrust bearing are set so as to be larger than the radial dimension of the thrust bearing. For this reason, when the plate is held by the plate holding portion in a state where the thrust bearing is located closest to the bearing hole in the thrust bearing housing portion, the plate is separated from the thrust bearing.

  For this reason, for example, even if the plate holding part holds the plate with the tip side (opening side) of the thrust bearing housing part facing upward, the thrust bearing in the thrust bearing housing part comes into contact with the plate and holds the plate. The plate can be appropriately held by the plate holding portion without dropping the plate from the portion.

According to a fifth aspect of the present invention, in the motor device according to the third or fourth aspect of the present invention, the radial bearing that is press-fitted and fixed to the radial bearing housing portion is provided in the thrust bearing housing portion. The outer peripheral shape of the corresponding part is formed smaller than the inner peripheral shape of the radial bearing accommodating portion.

In the motor device according to the fifth aspect of the present invention, the radial bearing is press-fitted and fixed to the radial bearing housing portion. Here, the outer peripheral shape of the portion corresponding to the thrust bearing housing portion of the radial bearing is formed smaller than the inner peripheral shape of the radial bearing housing portion. For this reason, when the radial bearing is press-fitted into the radial bearing housing portion, it is possible to prevent a force in the diameter reducing direction from acting on the thrust bearing housing portion, and further this force acts on the thrust bearing housed in the thrust bearing housing portion. Is prevented.

The motor device according to a sixth aspect of the present invention is the motor device according to any one of the third to fifth aspects, wherein the motor device is most moved to a side opposite to the radial bearing housing portion in the plate housing portion. When the thrust bearing is in contact with the plate, the distance L6 from the center of the thrust bearing to the axial end of the rotor shaft inserted into the bearing hole is larger than the radial dimension of the thrust bearing. It is set as follows.

In the motor device according to the sixth aspect of the present invention, the plate moves most on the opposite side of the plate housing portion from the radial bearing housing portion, and the thrust bearing moves until the thrust bearing contacts the plate in this state. In such a state, the dimensions of the radial bearing and the thrust bearing are set so that the distance L6 from the center of the thrust bearing to the axial end of the rotor shaft inserted into the bearing hole is larger than the radial dimension R of the thrust bearing. The

  For this reason, in this state, even if the rotor shaft of the motor is assembled in the bearing hole of the radial bearing, the thrust force of the rotor shaft does not act on the thrust bearing. Thereby, the damage by the collision with the thrust bearing of a rotor axis | shaft at the time of a rotor axis | shaft being assembled | attached to a radial bearing can be prevented.

According to a seventh aspect of the present invention, there is provided a method of assembling a motor device according to the present invention, wherein the plate holding portion formed at the axial end of the rotor shaft in a radial bearing having a bearing hole into which the rotor shaft of the motor is inserted is plate-shaped. A plate mounting step for holding the plate, and inserting the radial bearing into a radial bearing housing formed in a housing in which the rotor shaft is housed, and communicating with the radial bearing housing in the axial direction of the rotor shaft A radial bearing assembly for fixing the radial bearing to the radial bearing accommodating portion by inserting a part of the plate held by the plate holding portion into a plate accommodating portion capable of accommodating at least a part of the plate And the radial bearing accommodating portion communicated with each other by the plate at least partially entering the plate accommodating portion. The plate housing portion communicates with the plate housing portion on the opposite side of the radial bearing housing portion from the radial bearing housing portion in a state where the space formed by the plate housing portion is partitioned into the radial bearing housing portion side and the opposite side thereof. A resin filling step of filling the filled resin material from the resin filling portion and pressing the plate against a thrust bearing interposed between the axial end of the rotor shaft inserted into the bearing hole and the plate; It has.

In the method for assembling the motor device according to the seventh aspect of the present invention, a plate holding portion is formed at the end of the axial end of the rotor shaft in the radial bearing that rotatably supports the rotor shaft of the motor. In the mounting process, the plate is held by the plate holding portion.

  On the other hand, a radial bearing accommodating portion corresponding to the radial bearing is formed in the housing that accommodates the rotor shaft of the motor, and further, a plate accommodating portion is provided at the axial front end side of the rotor shaft with respect to the radial bearing accommodating portion. Communicate. The radial bearing having the plate held by the plate holding portion is inserted into the radial bearing housing portion in the radial bearing assembling step. At this time, the plate is held in an appropriate posture by the plate holder. In a state where the radial bearing is inserted and fixed in the radial bearing housing portion, a part of the plate enters the plate housing portion.

  When at least a part of the plate enters the plate housing portion, the space formed by the radial bearing housing portion and the plate housing portion that are in communication with each other is divided into the radial bearing housing portion side and the opposite side (resin filling portion side) by the plate. It is divided into and. In this state, in the resin filling step, the filled resin material melted from the resin filling portion communicating with the plate housing portion on the opposite side of the plate housing portion from the radial bearing housing portion is filled. The filled resin material that has flowed into the plate housing portion from the resin filling portion presses the plate toward the radial bearing housing portion.

  A rotor shaft thrust bearing is provided between the axial end of the rotor shaft inserted into the bearing hole of the radial bearing and the plate, and when the filled resin material presses the plate as described above, the thrust together with the plate is provided. The bearing is pressed against the end of the rotor shaft in the axial direction, but the filled resin material is cooled and cured, so that the heat shrinks and the backlash in the axial direction of the rotor shaft is appropriately adjusted.

  Here, in the method of assembling the motor device according to the present invention, when the radial bearing is inserted into the radial bearing housing portion while the plate is held by the plate holding portion formed on the radial bearing, a part of the plate is Enter the containment section. For this reason, the plate can be easily inserted (assembled) into the plate housing portion while maintaining an appropriate predetermined posture.

According to an eighth aspect of the present invention, there is provided a motor device assembling method according to the seventh aspect of the present invention, wherein the radial bearing is formed in communication with the bearing hole at a tip end side of the bearing hole. The thrust bearing formed in a spherical shape having an outer diameter larger than the inner diameter of the bearing hole is accommodated in the accommodating portion, and the radial bearing assembly step includes the thrust bearing accommodating portion in which the thrust bearing is accommodated. The radial bearing is inserted into the radial bearing housing portion from the lower side with the opening opposite to the bearing hole facing upward.

In the motor device assembled by the motor device assembly method according to the eighth aspect of the present invention, the thrust bearing has a spherical shape, and the outer diameter thereof is larger than the inner diameter of the bearing hole formed in the radial bearing. Further, in the radial bearing, a thrust bearing accommodating portion is formed in communication with the bearing hole at the tip end side of the bearing hole, and the thrust bearing is accommodated in the thrust bearing accommodating portion.

  By the way, in the structure disclosed by patent document 1, until a molten resin material is inject | poured, it is between a thrust plate and a thrust plate so that a steel ball may not fall from the recessed part formed in the front end surface of a rotating shaft. The state accommodated in the recess must be maintained. That is, there is a problem in that the steel ball falls off without being held unless the rotating shaft is maintained in the gear housing. In addition, since the steel ball is accommodated in the recess of the rotating shaft, there is a problem that the rotating shaft needs to have a diameter larger than the diameter of the steel ball.

  On the other hand, in the method of assembling the motor device according to the present invention in which the radial bearing or the thrust bearing is used as described above, the opening on the side opposite to the bearing hole of the thrust bearing housing portion faces upward. Thus, the thrust bearing is accommodated and the plate described above is held by the plate holding portion. In this state, in the radial bearing assembly process, the radial bearing is inserted from below relative to the radial bearing housing portion of the housing.

  Therefore, the thrust bearing accommodated in the thrust bearing accommodating portion by inserting and fixing the radial bearing in the radial bearing accommodating portion of the housing in the radial bearing assembling step can be accommodated even in a state where the rotor shaft is not assembled. Assembling work is easy without falling off the part. Moreover, the thrust bearing is configured to be held in a thrust bearing housing portion formed in the radial bearing. For this reason, the rotor shaft can be made thinner than the thrust bearing.

A method of assembling a motor device according to a ninth aspect of the present invention is the method for assembling the motor device according to the eighth aspect of the present invention, wherein the thrust is applied to the plate most moved to the opposite side of the radial bearing housing portion in the plate housing portion. With the bearing in contact, the distance from the center of the thrust bearing to the axial end of the rotor shaft inserted into the bearing hole is set to be longer than the radial dimension of the thrust bearing, and the radial In the rotor shaft insertion step of inserting the rotor shaft into the bearing hole of the radial bearing in a state where the radial bearing is inserted into the bearing housing portion, the opening on the opposite side to the thrust bearing housing portion in the bearing hole is upward. The rotor shaft is inserted into the bearing hole from above.

In the motor device assembled by the method for assembling the motor device according to the ninth aspect of the present invention, the plate moves most on the opposite side of the plate housing portion from the radial bearing housing portion, and the thrust bearing is applied to the plate in this state. In a state where the thrust bearing is moved until it comes into contact, the radial bearing or the thrust bearing is set such that the distance L6 from the center of the thrust bearing to the axial end of the rotor shaft inserted into the bearing hole is larger than the radial dimension R of the thrust bearing. Are set.

  According to the assembling method of the motor device according to the present invention in which such a radial bearing or a thrust bearing is used, in the rotor shaft inserting step of inserting the rotor shaft into the bearing hole of the radial bearing, first, the radial bearing is assembled in the radial bearing assembling step. With the bearing inserted and fixed in the radial bearing housing, the opening on the opposite side of the bearing hole from the thrust bearing housing is directed upward. As a result, the plate and the thrust bearing are lowered by their own weight, and the plate moves most on the side opposite to the radial bearing accommodating portion in the plate accommodating portion, and the thrust bearing is placed on the plate.

  Next, the rotor shaft is inserted into the bearing hole of the radial bearing. Here, in this state, as described above, the distance L6 from the center of the thrust bearing to the axial end of the rotor shaft inserted into the bearing hole is larger than the radial dimension R of the thrust bearing. For this reason, even if the rotor shaft is assembled in the bearing hole of the radial bearing, the thrust force of the rotor shaft does not act on the thrust bearing. Thereby, the damage by the collision with the thrust bearing of a rotor axis | shaft can be prevented in a rotor axis | shaft insertion process.

Method of assembling a motor device according to the present invention according to claim 1 0, in the present invention according to claims 7 to any one of claims 9, wherein the axial direction of the rotor shaft while the horizontal A resin filling step is performed.

The method of assembling a motor device according to the present invention according to claim 1 0, the resin filling process is carried out in the axial direction of the rotor shaft while the horizontal. For this reason, when the molten filling resin material is filled, the filling resin material is hardly affected by the weight of the rotor, thrust bearing, and plate of the motor. Thereby, while being able to stabilize the attitude | position of the plate pressed by the filling resin material, the filling pressure of the filling resin material can also be made low.

It is sectional drawing of the motor apparatus which concerns on one embodiment of this invention. It is sectional drawing to which the principal part of the motor apparatus which concerns on one embodiment of this invention was expanded. It is the disassembled perspective view which expanded the principal part of the motor apparatus which concerns on one embodiment of this invention. It is a schematic sectional drawing which shows a thrust bearing accommodation process and a plate mounting process. It is a schematic sectional drawing which shows the assembly | attachment process of the radial bearing to a housing. It is a schematic sectional drawing which shows the process of inserting a rotor axis | shaft. It is a schematic sectional drawing which shows a resin filling process.

<Configuration of the present embodiment>
FIG. 1 is a sectional view schematically showing a configuration of a wiper motor 10 as a motor device according to an embodiment of the present invention.

  As shown in FIG. 1, the wiper motor 10 includes a motor 12. The motor 12 includes a motor housing 14 made of a magnetic material. The motor housing 14 is formed in a bottomed cylindrical shape that opens toward the left side (gear housing side) in FIG. An armature 16 as a rotor (rotor) is accommodated inside the motor housing 14. The armature 16 includes an armature shaft 18 as a rotor shaft. The axial direction of the armature shaft 18 is along the opening direction of the motor housing 14 and the opposite direction (the left-right direction in FIG. 1). A bearing portion 20 is provided at the bottom of the motor housing 14 so as to face one axial end of the armature shaft 18 (the right end in FIG. 1).

  The bearing unit 20 includes a metal plate 22 at the center of the bottom of the motor housing 14. The plate 22 is made of a metal plate material harder than the main body portion of the armature shaft 18 by quenching or the like. A bottomed cylindrical recess 26 is formed at one end of the armature shaft 18 in the axial direction, and a bearing ball 24 accommodated in the recess 26 is in point contact with the plate 22. The bearing ball 24 has a spherical shape whose diameter is slightly smaller than the inner diameter of the recess 26 of the armature shaft 18.

  In addition, a metal plate 25 similar to the plate 22 is housed and fixed at the bottom of the recess 26 provided at one end of the armature shaft 18, and the bearing ball 24 is in point contact. Thereby, the thrust force is received at one axial end of the armature shaft 18. Note that the straight line connecting the two point contact positions between the plates 22 and 25 and the bearing ball 24 is parallel to the axis of the armature shaft 18 and slightly deviated, and the bearing ball 24 rotates with respect to the rotation of the armature shaft 18. While revolving, wear of the plate 22 is suppressed.

  A bearing 23 (oil-impregnated bearing) is fixed to the bearing portion 20 of the motor housing 14. By this bearing 23, the outer peripheral portion of the recess 26 of the armature shaft 18 is supported so as to be rotatable around its central axis.

  On the other hand, a pair or a plurality of pairs of field magnets 28 facing the north and south poles are provided inside the motor housing 14 so as to face each other via the armature body 30 of the armature 16. The armature 16 rotates around the central axis of the armature shaft 18 by the interaction between the magnetic field formed by the applied winding and the magnetic field formed by the field magnet 28.

  As shown in FIG. 1, a worm gear 32 is formed on the armature shaft 18 by rolling or the like on the other end side of the armature shaft 18 (the left side in FIG. 1, ie, the front end side). The other end of the armature shaft 18 including the worm gear 32 enters the inside of a gear housing 42 as a housing connected and fixed to the motor housing 14. The gear housing 42 includes a housing main body 44. A worm accommodating portion 46 is formed in the housing main body 44. The worm housing portion 46 opens in a direction (upward in FIG. 1) perpendicular to the axial direction of the armature shaft 18, and the other end side of the armature shaft 18 enters the worm housing portion 46 and the worm gear 32 is moved. positioned.

  Further, in the housing main body 44, a worm wheel housing portion is formed in communication with the worm housing portion 46 on the side of the worm housing portion 46 (the depth side in FIG. 2 or the front side of the paper surface). In the worm wheel housing portion, the worm wheel is rotatably supported around an axis whose axial direction is the opening direction of the housing main body 44 and the opposite direction in a state where the worm wheel is engaged with the worm gear 32.

  The worm wheel is directly or indirectly connected to the output shaft, and is further integrally connected to the base end portion of the wiper arm constituting the wiper device. A wiper blade including a blade rubber made of an elastic material such as a rubber material or an elastomer material is connected to the tip of the wiper arm. The blade rubber of the wiper blade wipes the surface of the windshield glass by reciprocatingly rotating around the base end side of the wiper arm, that is, the above-described output shaft in a state of being pressed against the windshield glass as a wiping surface in the vehicle. .

  On the other hand, the housing main body 44 is provided with a bearing mechanism 52 corresponding to the other end portion of the armature shaft 18 that has entered the worm housing portion 46.

  Here, FIG. 2 shows an enlarged cross-sectional view of the vicinity of the bearing mechanism 52 in FIG. 1, and FIG. 3 shows an exploded perspective view of the enlarged vicinity of the bearing mechanism 52. As shown in these drawings, the bearing mechanism 52 includes a radial bearing 54. The radial bearing 54 includes a cylindrical bearing portion 56. The inner hole of the bearing portion 56 is a bearing hole 58, which is formed coaxially with the bearing portion 56 and is open at both axial ends of the bearing portion 56.

  The inner diameter dimension of the bearing hole 58 is substantially equal to the outer diameter dimension on the other end side (front end side) further than the portion where the worm gear 32 is formed on the armature shaft 18 described above (strictly slightly larger). The portion of the armature shaft 18 on the other end side (tip side) further than the portion where the worm gear 32 is formed is fitted into a bearing hole 58 formed in the bearing portion 56, and the bearing portion 56, that is, the radial bearing 54. Is supported rotatably. The outer diameter of the armature shaft 18 at the other end (tip side) is larger than the outer diameter of the armature shaft 18 at one end by cold forging of the armature shaft 18 or rolling for forming a worm gear. It has a small outer diameter.

  A connecting portion 60 is integrally formed continuously from the other end of the armature shaft 18 in the bearing portion 56. Both the outer peripheral shape and the inner peripheral shape of the connecting portion 60 are formed in a cylindrical shape that is substantially coaxial with the bearing portion 56. However, the inner peripheral shape of the connecting portion 60 gradually increases in the inner diameter dimension toward the other end side of the armature shaft 18 in the connecting portion 60 (that is, the side opposite to the bearing portion 56). Further, the outer peripheral shape of the connecting portion 60 gradually decreases in outer diameter toward the other end side of the armature shaft 18 in the connecting portion 60.

  A bearing ball accommodating portion 62 as a thrust bearing accommodating portion is integrally formed on the side of the connecting portion 60 opposite to the bearing portion 56. The bearing ball housing portion 62 has a cylindrical shape whose outer diameter is substantially equal to the outer diameter size of the connection portion 60 on the bearing ball housing portion 62 side, and whose inner diameter is substantially equal to the inner diameter size of the connection portion 60 on the bearing ball housing portion 62 side. Is formed.

  A bearing ball 64 as a thrust bearing is housed inside the bearing ball housing portion 62. The bearing ball 64 is formed in a spherical shape whose outer diameter is the same as the outer diameter of the bearing ball 24 described above. Further, the outer diameter of the bearing ball 64 is substantially equal to the inner diameter of the bearing ball housing portion 62 (strictly, slightly smaller), and in a state where the bearing ball 64 is housed in the bearing ball housing portion 62, the bearing ball housing portion 62. The bearing ball 64 is in sliding contact with the inner periphery of the shaft. Further, the outer diameter of the bearing ball 64 is sufficiently larger than the inner diameter of the bearing hole 58, so that the bearing ball 64 cannot pass through the bearing hole 58.

  A plate 65 is provided at the other axial end of the armature shaft 18 facing the bearing ball 64. The plate 65 is made of a metal plate harder than the armature shaft 18 by quenching in the same manner as the plates 22 and 25 described above. The plate 65 is in sliding contact with the bearing ball 64 at the other axial end of the armature shaft 18. .

  A plate holding portion 66 is formed at the end of the bearing ball housing portion 62 opposite to the connection portion 60. The plate holding portion 66 has a larger inner diameter than the inner diameter of the bearing ball housing portion 62 and is formed in a ring shape coaxial with the bearing ball housing portion 62. A disc-shaped plate 68 can be fitted inside the plate holding portion 66. More specifically, a part of the plate 68 (the base end side of the plate 68 in the axial direction of the armature shaft 18) is fitted into the plate holding portion 66, and the tip end side of the plate 68 accommodates the bearing ball of the radial bearing 54. The plate 68 can be held in a state of protruding from the front end surface of the portion 62. The plate 68 is harder than the armature shaft 18 by quenching, like the plates 22 and 25, and the plate 68 is in sliding contact with the bearing ball 64 from the side opposite to the plate 65.

  Here, as shown in FIG. 4D, the distance L1 from the center of the bearing ball 64 to the bottom portion 67 of the plate holding portion 66 in the state where the bearing ball 64 has moved most toward the bearing hole 58 is the bearing ball 64. The dimension of each part of the radial bearing 54 is set so as to be larger than the radial dimension R. Therefore, when the plate 68 is fitted inside the plate holding portion 66 with the bearing ball 64 moved most to the bearing hole 58 side, as shown in FIG. And held in a separated state.

  As shown in FIGS. 2 and 3, the housing main body 44 is formed with a radial bearing accommodating portion 70 that constitutes an insertion hole corresponding to the radial bearing 54. The radial bearing housing portion 70 is a hole that opens toward one side of the armature shaft 18 in the axial direction (the worm housing portion 46 side). The inner peripheral shape of the radial bearing accommodating portion 70 is a circular shape coaxial with the armature shaft 18, and the inner diameter dimension thereof is substantially equal to the outer diameter dimension of the bearing portion 56 in the radial bearing 54.

  For this reason, the radial bearing 54 is inserted and fixed in the radial bearing housing 70 by being press-fitted into the radial bearing housing 70. However, in the radial bearing 54, the outer diameter of the bearing ball accommodating portion 62 is smaller than the inner diameter of the radial bearing accommodating portion 70. Therefore, as shown in FIG. 2, even when the radial bearing 54 is inserted into the radial bearing housing 70 by press-fitting, there is a gap between the outer peripheral portion of the bearing ball housing portion 62 and the inner circumferential portion of the radial bearing housing portion 70. A gap is formed. Further, as shown in FIG. 4C, even if the bearing ball 64 moves most toward the bearing hole 58 and a part of the bearing ball 64 protrudes from the bearing ball accommodating portion 62 toward the bearing hole 58, the bearing ball 64 The inner peripheral shape of the radial bearing 54 is set so that the center of is located inside the bearing ball housing portion 62.

  On the other hand, a reduced diameter portion 76 is formed continuously from the end of the radial bearing housing 70 opposite to the opening end on the worm housing 46 side. The inner peripheral shape of the reduced diameter portion 76 is a coaxial circle with respect to the radial bearing accommodating portion 70, and the inner diameter dimension at the end of the reduced diameter portion 76 on the radial bearing accommodating portion 70 side is that of the radial bearing accommodating portion 70. It is set equal to the inner diameter. However, the inner diameter dimension of the reduced diameter portion 76 gradually decreases toward the opposite side to the radial bearing accommodating portion 70, and the inner diameter dimension of the reduced diameter portion 76 at the end opposite to the radial bearing accommodating portion 70 is a plate. It is set to be substantially equal to the outer diameter dimension of 68 (strictly, slightly larger than the outer diameter dimension of the plate 68).

  On the opposite side of the reduced diameter portion 76 from the radial bearing accommodating portion 70, a plate accommodating portion 78 is formed that forms a fitting insertion hole together with the radial bearing accommodating portion 70 and the reduced diameter portion 76. The plate housing portion 78 is coaxial with the radial bearing housing portion 70 and has a bottomed hole shape having a bottom portion on the side opposite to the reduced diameter portion 76. The inner diameter dimension of the plate accommodating portion 78 is set to be approximately equal to the inner diameter dimension of the end portion of the reduced diameter portion 76 on the plate accommodating portion 78 side. Further, the axial dimension of the plate accommodating portion 78 is set to be equal to or greater than the thickness dimension D1 of the plate 68. For this reason, the plate 68 enters the plate accommodating portion 78 coaxially with the plate accommodating portion 78 and can slide in the plate accommodating portion 78 in the axial direction.

  Here, as shown in FIG. 2, from the opening end of the radial bearing housing portion 70 opposite to the reduced diameter portion 76 (on the worm housing portion 46 side) to the opening end of the plate housing portion 78 on the reduced diameter portion 76 side. The distance L2 between the opening end of the radial bearing housing portion 70 opposite to the reduced diameter portion 76 (on the worm housing portion 46 side) and the bottom portion 67 of the plate holding portion 66 and the thickness dimension D1 of the plate 68 are as follows. The dimension of each part of the radial bearing 54, the thickness dimension D1 of the plate 68, the radial bearing accommodating part 70, the reduced diameter part 76, and the axial dimension of the plate accommodating part 78 are set so as to be smaller than the sum of these.

  Thus, in a state where the radial bearing 54 is inserted into the radial bearing housing portion 70, the distance L4 from the opening end of the plate housing portion 78 on the radial bearing housing portion 70 side to the bottom portion 67 of the plate holding portion 66 (that is, the above-described case). The difference between the distance L2 and the distance L3) is less than the thickness dimension D1 of the plate 68.

  In addition, the end of the armature shaft 18 that is inserted into the bearing hole 58 and rotatably supported by the radial bearing 54 from the other axial end (front end) of the plate accommodating portion 78 on the opposite side to the reduced diameter portion 76 ( The distance L5 to the bottom of the plate accommodating portion 78 is larger than the sum of the thickness dimension D1 of the plate 68 and twice the radial dimension R of the bearing ball 64 (that is, the diameter dimension of the bearing ball 64). The dimension of each part of the radial bearing 54, the thickness dimension D1 of the plate 68, the axial dimension of the radial bearing accommodating part 70, the reduced diameter part 76, and the plate accommodating part 78 are set.

  For this reason, as shown in FIGS. 6B and 7A, the plate 68 abuts against the bottom of the plate accommodating portion 78, and the bearing ball 64 abuts against the plate 68 in this state. In the state, the bearing ball 64 is separated in the axial direction of the armature shaft 18 with respect to the other axial end (tip) of the armature shaft 18 (that is, the armature shaft 18 in this state shown in FIG. 7A). The distance L6 from the other axial end to the center of the bearing ball 64 is larger than the radial dimension R of the bearing ball 64).

  On the other hand, a sprue 92 constituting a resin filling portion is formed in the housing main body 44 corresponding to the bearing mechanism 52. The sprue 92 has a lateral hole 94. The horizontal hole 94 is a hole having a circular cross section along the axial direction of the armature shaft 18, and the inner diameter dimension thereof is set to be sufficiently smaller than the inner diameter dimension of the plate accommodating portion 78. The lateral hole 94 is formed substantially coaxially with respect to the radial bearing accommodating portion 70 and the plate accommodating portion 78, and the lateral hole 94 is opened at substantially the center of the bottom portion of the plate accommodating portion 78 to form the plate accommodating portion 78. Communicate. In other words, the bottom of the plate accommodating portion 78 is formed around the opening of the lateral hole 94 to the plate accommodating portion 78.

  The sprue 92 is provided with a vertical hole 96. The vertical hole 96 has an axial direction that is open in the same direction as the opening direction of the housing body 44, and has a circular cross section along a direction orthogonal to the horizontal hole 94. One end of the vertical hole 96 (the lower end in FIG. 2) communicates with the horizontal hole 94. A nozzle press contact portion 98 is formed in the opening at the other end of the vertical hole 96. The nozzle pressure contact portion 98 has a truncated cone shape or a concave curved surface shape (in the present embodiment, a truncated cone shape) whose inner diameter dimension gradually increases toward the side opposite to the vertical hole 96 (that is, the opening side of the housing main body 44). Then, as shown in FIG. 7, the tip end of the nozzle 114 of the injection molding machine 112 comes into contact, and the filled resin material 116 melted into the sprue 92 is injected (supplied) from the opening of the vertical hole 96.

<Operation and effect of the present embodiment>
Next, an outline of an assembly method of the bearing mechanism 52 in the wiper motor 10 will be described.

(Bearing ball housing process)
In the bearing ball housing step as the thrust bearing housing step, as shown in FIG. 4, a tube holder 132 is used. A cylindrical holding projection 134 is formed on the tube holder 132. The holding projection 134 is set so that the outer diameter dimension is substantially equal to the inner diameter dimension of the bearing hole 58 formed in the radial bearing 54 (strictly, slightly smaller), and the radial bearing 54 is positioned and held with respect to the tube holder 132. ing. The axial dimension of the holding protrusion 134 is set shorter than the axial dimension of the bearing hole 58. As shown in FIG. 4A, in the bearing ball housing step, the front end side of the holding projection 134 is directed upward in the vertical direction, and the bearing portion 56 side of the radial bearing 54 is set to the holding projection 134 of the tube holder 132. The radial bearing 54 is set on the tube holder 132 so as to be coaxially approached from above.

  As shown in FIGS. 4B and 4C, when the holding projection 134 of the tube holder 132 is fitted into the bearing hole 58 of the radial bearing 54, in this state, that is, the bearing of the radial bearing 54. The bearing ball 64 is accommodated in the bearing ball accommodating portion 62 from the opening end of the ball accommodating portion 62 opposite to the bearing portion 56 (the state shown in FIG. 4C). Here, the outer diameter of the bearing ball 64 is sufficiently larger than the inner diameter of the bearing hole 58. For this reason, the bearing ball 64 does not fall through the bearing hole 58, and the bearing ball 64 can be accommodated in the bearing ball accommodating portion 62.

(Plate mounting process)
Next, in the plate mounting step, as shown in FIGS. 4C and 4D, in the state where the bearing ball 64 is housed in the bearing ball housing portion 62, the plate 68 is mounted from the upper side in the vertical direction. 66 (shown in FIG. 4D). Here, as described above, since the bearing ball 64 is moved to the bearing hole 58 side by its own weight, the plate 68 fitted inside the plate holding portion 66 and the bearing ball 64 are separated from each other and the plate 68 is separated. Is retained. Therefore, the state in which the plate 68 held by the plate holding part 66 is held by the plate holding part 66 without being pushed out by the bearing ball 64 is maintained.

  Thus, even in a state where the bearing ball 64 is housed in the bearing ball housing portion 62, the axial dimension and the like of the bearing ball housing portion 62 are set so that the bearing ball 64 does not protrude outside the plate holding portion 66. . As a result, as shown in FIG. 4D, the plate 68 is fitted into the plate holding portion 66 of the radial bearing 54, and the plate 68 is held by the radial bearing 54 while maintaining a predetermined posture.

  In this embodiment, the bearing ball 64 is accommodated in the radial bearing 54 after being set in the tube holder 132. However, the radial bearing 54 in which the bearing ball 64 is accommodated in advance is set in the tube holder 132 and the plate holding portion. A plate 68 may be attached to 66.

(Assembly process of radial bearing 54)
Next, in the assembly process of the radial bearing 54, as shown in FIG. 5A, the radial bearing housing portion 70 is positioned above the radial bearing 54 provided with the bearing ball 64 and the plate 68 in the vertical direction. Thus, the housing body 44 is arranged. In this state, one of the housing main body 44 and the radial bearing 54 is brought closer to the other along the axial direction of the radial bearing accommodating portion 70 and the radial bearing 54, and as shown in FIG. 54 is press-fitted into the radial bearing housing 70.

  In the form shown in FIG. 5, the housing main body 44 approaches the radial bearing 54 set on the tube holder 132 from above in the vertical direction, and the radial bearing 54 is press-fitted into the radial bearing accommodating portion 70. However, the cylindrical holder 132 on which the radial bearing 54 is set may be raised to press-fit the radial bearing 54 into the radial bearing accommodating portion 70.

  Thus, also in the assembly process of the radial bearing 54, the opening end of the radial bearing 54 opposite to the bearing portion 56 of the bearing ball accommodating portion 62 is directed upward in the vertical direction. For this reason, the bearing ball 64 does not come out of the bearing ball accommodating portion 62 in the assembly process of the radial bearing 54.

  Further, as described above, the distance L2 from the opening end of the radial bearing housing portion 70 on the side opposite to the reduced diameter portion 76 (on the worm housing portion 46 side) to the opening end of the plate housing portion 78 on the reduced diameter portion 76 side is In addition, the distance L3 from the opening end of the radial bearing housing portion 70 opposite to the reduced diameter portion 76 (the worm housing portion 46 side) to the bottom 67 of the plate holding portion 66 and the sum of the thickness dimension D1 of the plate 68 are larger. small.

  For this reason, as shown in FIG. 5B, when the radial bearing 54 is press-fitted to a predetermined position in the radial bearing housing portion 70, a part of the plate 68 on the plate housing portion 78 side is the plate housing portion 78. Get in. In this state, both end sides of the plate 68 along the axial direction of the armature shaft 18 are held by the plate holding portion 66 and the plate housing portion 78.

  Further, as shown in FIG. 6, even when the holding of the plate 68 by the plate holding portion 66 is released, at least a part of the plate 68 can be allowed to enter the plate holding portion 78 (that is, the plate holding portion). It is easy to fit the plate 68 to 78). Accordingly, the plate 68 can be stabilized in a predetermined posture in the plate accommodating portion 78 even in a state before the filling resin material 116 is filled in the resin filling portion.

  Further, when the radial bearing 54 is press-fitted into the radial bearing housing portion 70 as described above, a force on the radial axis 54 side (that is, the diameter reduction direction) acts on the radial bearing 54 from the inner peripheral portion of the radial bearing housing portion 70. To do.

  Here, as described above, even if the bearing ball 64 moves most to the bearing hole 58 side and a part of the bearing ball 64 protrudes to the bearing hole 58 side from the bearing ball accommodating portion 62, the center of the bearing ball 64 is The inner peripheral shape of the radial bearing 54 is set so as to be located inside the bearing ball housing portion 62. Further, the outer diameter of the bearing ball accommodating portion 62 is smaller than the inner diameter of the radial bearing accommodating portion 70, and a gap is formed between the outer peripheral portion of the bearing ball accommodating portion 62 and the inner peripheral portion of the radial bearing accommodating portion 70. Is done. For this reason, in the state where the radial bearing 54 is press-fitted into the radial bearing housing portion 70, the bearing portion 56 is subjected to a force on the central axis side (that is, the diameter reducing direction) from the inner peripheral portion of the radial bearing housing portion 70. Such a force is prevented from acting on the bearing ball accommodating portion 62. As a result, it is possible to prevent the force during press-fitting from acting on the bearing ball 64 housed in the bearing ball housing portion 62.

(Step of inserting armature shaft 18)
Next, in the insertion step of the armature shaft 18 as the rotor shaft insertion step, the housing body 44 in which the radial bearing 54 is assembled to the radial bearing housing portion 70 is moved in the vertical direction as shown in FIG. Is turned the other way around. As a result, the bearing ball 64 moves downward in the vertical direction within the bearing ball housing portion 62 due to its own weight, and the bottom side of the plate housing portion 78 formed in the housing body 44 by the moved bearing ball 64 pushing down the plate 68. The plate 68 is moved.

  Here, as described above, a part of the plate 68 on the side of the plate housing portion 78 enters the plate housing portion 78 in a state where the radial bearing 54 is press-fitted and fixed to the radial bearing housing portion 70. For this reason, if the bearing ball 64 presses the plate 68 toward the bottom side of the plate housing portion 78, the plate 68 can easily enter the plate housing portion 78 and move to the bottom side of the plate housing portion 78. Even if the bearing ball 64 is moved to the plate housing portion 78 side most in the bearing ball housing portion 62 due to the movement of the bearing ball 64 that moves the plate 68 to the bottom side of the plate housing portion 78, the bearing Since the center of the ball 64 is located in the bearing ball housing portion 62, the radial holding state of the bearing ball 64 is maintained.

  Further, as shown in FIGS. 6A and 6B, in this state, the other axial end side (tip side) of the armature shaft 18 of the armature 16 is inserted into the housing main body 44 from above in the vertical direction, so that the worm gear 32 is disposed in the worm housing portion 46 of the housing main body 44, and the other end side (tip side) in the axial direction of the armature shaft 18 is fitted into the bearing hole 58 of the radial bearing 54 as shown in FIG. Inserted.

  Here, as described above, from the other end in the axial direction of the armature shaft 18 that is rotatably supported by the radial bearing 54, the end portion opposite to the reduced diameter portion 76 of the plate housing portion 78 (plate housing portion 78. The distance L5 to the bottom) is greater than the sum of the thickness dimension D1 of the plate 68 and twice the radial dimension R of the bearing ball 64 (that is, the diameter dimension of the bearing ball 64). Therefore, in this state, a gap along the axial direction of the armature shaft 18 is formed between the other axial end of the armature shaft 18 and the bearing ball 64. For this reason, when the armature shaft 18 is inserted into the bearing hole 58, the other end in the axial direction of the armature shaft 18 is in strong contact with the bearing ball 64 (for example, collides) and the bearing ball 64 is damaged. It is preventing.

(Resin filling process)
Next, in the resin filling step, as shown in FIG. 7A, the housing body 44 rotates so that the axial direction of the armature shaft 18 supported by the radial bearing 54 is substantially horizontal with respect to the vertical direction. Be made. In this state, the vertical hole 96 of the sprue 92 formed in the housing main body 44 extends in the vertical direction (direction orthogonal to the axial direction of the armature shaft 18), and the nozzle pressure contact portion 98 opens upward. In this state, as shown in FIG. 7A, the nozzle 114 of the injection molding machine 112 is brought into contact with the nozzle pressure contact portion 98, and the filled resin material 116 melted as shown in FIG. It is injected (supplied) into the sprue 92.

  The filled resin material 116 injected into the sprue 92 passes through the vertical hole 96 and the horizontal hole 94, and further passes through the opening of the horizontal hole 94 communicating with the plate housing part 78 and enters the plate housing part 78. The filling resin material 116 that has entered the plate housing portion 78 is partitioned by the plate 68 on the resin filling portion side from the radial bearing housing portion 70 side, so that the plate 68 is separated from the radial bearing housing portion 70 side by the injection pressure F (plate housing). The plate 68 is moved from the bottom of the plate accommodating portion 78 by pressing toward the opening side of the portion 78.

  The plate 68 moved in this manner presses the bearing ball 64 and moves together in the bearing ball housing portion 62 to bring the bearing ball 64 into contact with the tip of the armature shaft 18. Thereafter, the filling resin material 116 is cooled and hardened, and an appropriate backlash adjustment in the thrust direction of the armature shaft 18 released from the pressed state by heat shrinkage at that time is performed. Thus, the bearing in the thrust direction (axial direction) of the armature shaft 18 becomes the bearing portion 20 described above.

  Here, the filling resin material 116 that has passed through the bottom of the plate accommodating portion 78 from the sprue 92 and entered the plate accommodating portion 78 (that is, between the bottom of the plate accommodating portion 78 and the plate 68) In the periphery of the opening that communicates with the plate accommodating portion 78, the disk becomes a thin disk having a thin thickness. When such a filling resin material 116 is cured, it thermally shrinks at a certain ratio, and the amount of shrinkage is related to the amount of axial play of the armature shaft 18.

  Here, the resin shrinks in the thickness direction at a constant ratio with respect to the dimension D2 in the thickness direction of the filling resin material 116 that has entered the plate housing portion 78, but the filling resin material 116 in the plate housing portion 78 as described above. The dimension D2 in the thickness direction is small, and the amount of shrinkage can be made extremely small even when heat shrinks. For this reason, the amount of backlash in the axial direction of the armature shaft 18 can be made extremely small.

  In addition, since the opening part (center part) which the horizontal hole 94 and the plate accommodating part 78 communicate becomes thick, since the shrinkage | contraction amount of the axial direction of the armature shaft 18 also becomes large and a hollow arises in the center part, Since the amount of shrinkage is extremely small as described above, the influence on the displacement due to the heat shrinkage of the plate 68 in contact with the surrounding portion is also extremely small.

  Further, for example, as shown in FIG. 6, when the filling resin material 116 is filled in a state where the horizontal hole 94 of the sprue 92 is positioned on the lower side in the vertical direction of the plate housing portion 78, the filling resin material 116 forms the horizontal hole 94. It flows upward in the vertical direction and enters the plate accommodating portion 78. In such a case, the filling resin material 116 flows toward the plate accommodating portion 78 against gravity, and the weight of the plate 68 and the bearing ball 64 acts against the flow of the filling resin material 116.

  On the other hand, in the present embodiment, the filling of the housing main body 44 is melted in a state where the armature shaft 18 supported by the radial bearing 54 is rotated so that the axial direction of the armature shaft 18 is substantially horizontal with respect to the vertical direction. The resin material 116 is filled. For this reason, when the filling resin material 116 flows into the plate accommodating portion 78 from the lateral hole 94, the filling resin material 116 is not easily affected by the above-described gravity and the weight of the plate 68 and the bearing ball 64, and smoothly. It can flow into the plate accommodating portion 78.

  In the wiper motor 10 manufactured through the manufacturing process including the assembly process as described above, the worm gear 32 is engaged with the worm wheel, and therefore the worm gear 32 receives a reaction force along the axial direction of the armature shaft 18 from the worm wheel. . In addition, when the motor 12 is switched from the forward drive to the reverse drive and from the reverse drive to the forward drive, the direction of the reaction force received by the worm gear 32 from the worm wheel is also reversed.

  Here, in the wiper motor 10, bearing balls 24 and 64 and plates 22, 25, 65, and 68 are provided on both axial ends of the armature shaft 18. Here, since the worm gear 32 meshes with the worm wheel, even if the worm gear 32 receives a reaction force along one of the axial directions of the armature shaft 18 or the other from the worm wheel, the worm gear 32 moves in the axial direction of the armature shaft 18. It is possible to suppress the displacement of the worm gear 32 along, and to suppress the generation of abnormal noise caused by the axial displacement of the armature shaft 18.

  In the present embodiment, the bearing ball 64 constituting the thrust bearing is accommodated in the bearing ball accommodating portion 62 of the radial bearing 54 on the other axial end side of the armature shaft 18, and the radial bearing 54 is accommodated in the housing body 44. In this configuration, the formed radial bearing accommodating portion 70 is press-fitted. For this reason, unlike the configuration in which the armature shaft 18 accommodates the bearing ball 64 as a thrust bearing, it is not necessary to make the outer diameter dimension of the armature shaft 18 larger than the diameter dimension of the bearing ball 64, so that the armature shaft 18 is formed thin. it can.

  For example, the outer diameter dimension of the armature shaft 18 at the other end side (tip side) is larger than the outer diameter dimension at one end side of the armature shaft 18 due to cold forging of the armature shaft 18 or rolling for forming a worm gear. If the configuration in which the armature shaft 18 accommodates the bearing ball 64 is applied to one end side and the other end side of the armature shaft 18 when the outer diameter size is small, the bearing balls having different diameter sizes on the one end side and the other end side are applied. Will be used. Therefore, in the case of the wiper motor that drives the motor 12 in the normal direction and the reverse direction as in this embodiment, there is a problem that the rotational loss due to the bearing in the thrust direction differs between the normal direction drive and the reverse direction drive.

  However, in the present embodiment, it is necessary to make the outer diameter dimension of the armature shaft 18 larger than the diameter dimension of the bearing ball 64 even if the outer diameter dimension on the other end side (tip side) of the armature shaft 18 is smaller than the one end side. Therefore, the diameter dimension of the bearing ball 24 on one end side and the bearing ball 64 on the other end side can be made substantially the same. As a result, the rotation loss caused by the bearing in the thrust direction is substantially the same between the normal rotation drive and the reverse rotation drive in the forward rotation and reverse rotation drive as described above, and the fluctuation of the wiper operation during the forward rotation and the reverse rotation is suppressed. Can contribute.

  In the present embodiment, the distance L2 from the opening end of the radial bearing housing portion 70 on the opposite side to the reduced diameter portion 76 to the opening end of the plate housing portion 78 on the reduced diameter portion 76 side is defined as the bearing of the radial bearing 54. The portion 56 is set to be smaller than the sum of the distance L3 from the end opposite to the connection portion 60 to the bottom portion 67 of the plate holding portion 66 and the thickness dimension D1 of the plate 68, whereby a radial bearing is obtained. A part of the plate 68 is made to enter the plate housing portion 78 in a state where 54 is press-fitted into the radial bearing housing portion 70.

  However, the above-described interval L2 may be larger than the sum of the interval L3 and the thickness dimension D1 of the plate 68. That is, when the radial bearing 54 is press-fitted into the radial bearing accommodating portion 70 in a state where the reduced diameter portion 76 constitutes a part of the plate accommodating portion 78 and the plate 68 is retained by the plate retaining portion 66, the plate 68 is An appropriate posture for fitting into the accommodating portion 78 may be maintained and guided into the plate accommodating portion 78. In this way, if the plate 68 is positioned at the reduced diameter portion 76 of the plate housing portion 78 in a state where the radial bearing 54 is press-fitted into the radial bearing housing portion 70, the plate 68 moves to the plate housing portion 78 side. As a result, it is guided on the inner peripheral surface of the reduced diameter portion 76 and can be easily fitted into the plate accommodating portion 78.

  In the present embodiment, the present invention is applied to the wiper motor 10. However, the present invention is not limited to the wiper motor 10, and the thrust bearing at the at least one end of the rotor shaft of the motor is described above. What is necessary is just to be the structure which did.

  Therefore, for example, the present invention may be applied to a power window device for raising and lowering a door glass of a vehicle with a driving force of a motor. Further, the present invention may be applied to a sunroof device or moon roof device that opens and closes an opening by moving a skylight that closes the opening formed in the roof portion of the vehicle with the driving force of a motor. Furthermore, the present invention may be applied to a seat slide device for moving a vehicle seat in the vehicle front-rear direction with the driving force of the motor, a reclining device for tilting the seat back of the seat with the driving force of the motor, or the like.

  DESCRIPTION OF SYMBOLS 10 ... Wiper motor (motor apparatus), 12 ... Motor, 14 ... Motor housing, 16 ... Armature (rotor), 18 ... Armature shaft (rotor shaft), 20 ... Bearing part, 22 ... Plate, 23 ... Bearing, 24 ... Bearing ball, 25 ... Plate, 26 ... Recess, 28 ... Field magnet, 30 ... Armature body, 32 ... · Worm gear, 42 ··· Gear housing, 44 · · · Housing body, 46 · · · Worm housing, 52 · · · Bearing mechanism, 54 · · · Radial bearing, 56 · · · Bearing portion, 58 · · · Bearing hole, 60... Connecting portion, 62... Bearing ball housing portion (thrust bearing housing portion), 64... Bearing ball (thrust bearing), 65. 68 ... Plate, 70 ... La Al bearing housing part, 76 ... reduced diameter part, 78 ... plate housing part, 92 ... sprue (resin filling part), 94 ... horizontal hole (resin filling part), 96 ... vertical hole (Resin filling part), 98 ... nozzle pressure contact part, 112 ... injection molding machine, 114 ... nozzle, 116 ... filling resin material, 132 ... tube holder, 134 ... holding projection ,

Claims (10)

A motor having a rotor that rotates around the rotor shaft when energized;
A housing that houses the rotor shaft;
Inserted in the axial direction of the rotor shaft with respect to a radial bearing housing portion formed in the housing, has a bearing hole into which one axial end side of the rotor shaft enters, and rotates the rotor shaft that enters the bearing hole Radial bearings to support freely,
The radial bearing accommodating portion and the plate accommodating portion that are at least partially inserted into the plate accommodating portion formed in the housing so as to communicate with the radial bearing accommodating portion in the axial direction of the rotor shaft and communicate with each other. Partitioning the radial bearing housing portion side and the opposite side thereof in the axial direction of the rotor shaft, and a plate movable in the axial direction;
A thrust bearing that receives axial force on the rotor shaft in contact with the rotor shaft on the radial bearing housing side of the plate;
A filling resin material filled in a resin filling portion communicating with the plate housing portion on the side opposite to the radial bearing housing portion with respect to the plate;
The plate is formed at an end of the radial bearing side of the radial bearing so as to be able to hold the plate in a predetermined posture, and the plate is configured to suppress displacement of the plate in a direction orthogonal to the axial direction of the rotor shaft. A plate holding portion for contacting the outer peripheral portion and holding the plate so that at least a part of the plate enters the plate housing portion in a state of being inserted and fixed to the radial bearing housing portion of the radial bearing;
A motor device comprising: A motor having a rotor that rotates around the rotor shaft when energized;
A housing that houses the rotor shaft;
Inserted in the axial direction of the rotor shaft with respect to a radial bearing housing portion formed in the housing, has a bearing hole into which one axial end side of the rotor shaft enters, and rotates the rotor shaft that enters the bearing hole Radial bearings to support freely,
The radial bearing accommodating portion and the plate accommodating portion that are at least partially inserted into the plate accommodating portion formed in the housing so as to communicate with the radial bearing accommodating portion in the axial direction of the rotor shaft and communicate with each other. Partitioning the radial bearing housing portion side and the opposite side thereof in the axial direction of the rotor shaft, and a plate movable in the axial direction;
A thrust bearing that receives axial force on the rotor shaft in contact with the rotor shaft on the radial bearing housing side of the plate;
A filling resin material filled in a resin filling portion communicating with the plate housing portion on the side opposite to the radial bearing housing portion with respect to the plate;
The plate is formed at the distal end of the radial bearing so as to be able to hold the plate in a predetermined posture, and the plate is arranged so that at least a part of the plate enters the plate housing portion when the radial bearing is inserted into and fixed to the radial bearing housing portion. And a bottom portion that contacts the axial end surface of the rotor shaft in the state where the plate is held, and the radial bearing is inserted into the radial bearing housing portion, An interval L4 along the axial direction of the rotor shaft from the opening end on the radial bearing housing portion side to the bottom portion in the plate housing portion is less than a dimension D1 along the axial direction of the rotor shaft in the plate. A set plate holder,
A motor device comprising: A motor having a rotor that rotates around the rotor shaft when energized;
A housing that houses the rotor shaft;
Inserted in the axial direction of the rotor shaft with respect to a radial bearing housing portion formed in the housing, has a bearing hole into which one axial end side of the rotor shaft enters, and rotates the rotor shaft that enters the bearing hole Radial bearings to support freely,
The radial bearing accommodating portion and the plate accommodating portion that are at least partially inserted into the plate accommodating portion formed in the housing so as to communicate with the radial bearing accommodating portion in the axial direction of the rotor shaft and communicate with each other. Partitioning the radial bearing housing portion side and the opposite side thereof in the axial direction of the rotor shaft, and a plate movable in the axial direction;
A thrust bearing that is formed in a spherical shape having an outer diameter dimension larger than an inner diameter dimension of the bearing hole, and that receives an axial force on the rotor shaft in contact with the rotor shaft on the radial bearing housing portion side of the plate; ,
A thrust bearing housing that is formed in the radial bearing, communicates with the bearing hole and is open at an end opposite to the bearing hole and is capable of housing the thrust bearing;
A filling resin material filled in a resin filling portion communicating with the plate housing portion on the side opposite to the radial bearing housing portion with respect to the plate;
The plate is formed at the distal end of the radial bearing so as to be able to hold the plate in a predetermined posture, and the plate is arranged so that at least a part of the plate enters the plate housing portion when the radial bearing is inserted into and fixed to the radial bearing housing portion. A plate holding section for holding
A motor device comprising: In the state where the thrust bearing is located closest to the bearing hole in the thrust bearing housing portion, the distance L1 from the center of the thrust bearing to the plate held by the plate holding portion is larger than the radial dimension R of the thrust bearing. The motor device according to claim 3 , wherein the motor device is set to be larger. Wherein said radial bearing is press-fitted to the radial bearing accommodating portion, said thrust bearing housing part according to claim 3 or claim 4 outer peripheral shape of the portion corresponding to smaller than the inner peripheral shape of the radial bearing accommodating portion The motor apparatus as described in. The axial direction of the rotor shaft inserted into the bearing hole from the center of the thrust bearing in a state where the thrust bearing is in contact with the plate that is most moved to the opposite side of the radial bearing housing in the plate housing The motor device according to any one of claims 3 to 5 , wherein an interval L6 to the end portion is set to be larger than a radial dimension R of the thrust bearing. A plate mounting step of holding a plate-like plate in a plate holding portion formed at an axial end of the rotor shaft in a radial bearing having a bearing hole into which the rotor shaft of the motor is inserted;
The radial bearing can be inserted into a radial bearing accommodating portion formed in a housing accommodating the rotor shaft, and at least a part of the plate can be accommodated in communication with the radial bearing accommodating portion in the axial direction of the rotor shaft. A radial bearing assembly step of inserting a part of the plate held by the plate holding portion into the plate holding portion and fixing the radial bearing to the radial bearing holding portion;
A state in which a space formed by the radial bearing housing portion and the plate housing portion that are communicated with each other by the plate, at least a part of which has entered the plate housing portion, is partitioned between the radial bearing housing portion side and the opposite side. An axial end of the rotor shaft inserted into the bearing hole by filling a filling resin material from a resin filling portion communicating with the plate housing portion on the side opposite to the radial bearing housing portion of the plate housing portion A resin filling step of pressing the plate against a thrust bearing interposed between a portion and the plate;
A method for assembling a motor device. In the radial bearing, the thrust bearing formed in a spherical shape having an outer diameter larger than the inner diameter of the bearing hole is formed in a thrust bearing housing portion formed in communication with the bearing hole on the tip side of the bearing hole. Contained,
In the radial bearing assembly step, the radial bearing is received from the lower relative to the radial bearing receiving portion with the opening on the opposite side to the bearing hole of the thrust bearing receiving portion containing the thrust bearing facing upward. The motor device assembling method according to claim 7 , wherein a bearing is inserted. The axial direction of the rotor shaft inserted into the bearing hole from the center of the thrust bearing in a state where the thrust bearing is in contact with the plate that is most moved to the opposite side of the radial bearing housing in the plate housing The distance L6 to the end is set to be larger than the radial dimension R of the thrust bearing,
In the rotor shaft inserting step of inserting the rotor shaft into the bearing hole of the radial bearing in a state where the radial bearing is inserted and fixed in the radial bearing housing portion, the bearing hole has a side opposite to the thrust bearing housing portion. The motor device assembling method according to claim 8 , wherein the rotor shaft is inserted into the bearing hole from above with the opening facing upward. The motor device assembling method according to any one of claims 7 to 9 , wherein the resin filling step is performed in a state where an axial direction of the rotor shaft is horizontal.

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