JP2007185068A - Motor rotating shaft mounting structure and motor rotating shaft mounting method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the number of assembling steps and the number of parts by eliminating the need to manufacture a retaining washer and a thrust washer separately or to be individually assembled to a bearing housing.
A disk-shaped member 9 made of a resin molded body is positioned and held on a step portion 11 of a bearing housing 1 and then a rotating shaft 4 is inserted into the radial bearing 2 in the process of inserting the rotating shaft 4 into the disk. A punched piece 9A is formed by punching the punched region 95 of the member 9, and the punched piece 9A is used as the thrust washer 5, and the annular piece 9B remaining by punching the punched piece 9A by the rotating shaft 4 is prevented from being removed. Used as 3.
[Selection] Figure 1

Description

  The present invention relates to a rotating shaft mounting structure and a rotating shaft mounting method for a motor employed in an electric / electronic device using a disk such as a DVD as a recording medium, and in particular, a retaining washer for retaining the rotating shaft. The present invention relates to a motor rotating shaft mounting structure and a motor rotating shaft mounting method in which measures are taken to quickly and easily perform an assembly process and a thrust washer mounting process for receiving a thrust force applied to the rotating shaft.

  Conventionally, as a mechanism for preventing the rotor of a brushless motor from coming off, it has been proposed to employ a configuration in which a resin washer held in a bearing housing is fitted into an annular groove of a shaft (rotary shaft) to which the rotor is fixed. (For example, refer to Patent Document 1). This Patent Document 1 also describes that the tip of the shaft is received by a thrust receiver to restrict the movement of the rotating shaft in the thrust direction. There has also been proposed a bearing pressure structure using a thrust washer (see, for example, Patent Document 2). Furthermore, when assembling the motor shaft, after the clip is bent by being pressed by the motor shaft, the clip is engaged with the motor shaft to prevent the motor shaft from being pulled out (for example, a patent). Reference 3). Referring to each of these patent documents, it has hitherto been known that a rotating shaft is retained by using a resin washer held in a bearing housing, and a thrust force applied to the rotating shaft is received by a thrust washer. It can be said.

On the other hand, based on the idea that the retaining washer used for retaining the rotating shaft and the thrust washer that receives the thrust force applied to the rotating shaft are separate parts that are separate from each other, the motor assembly line However, the procedure of assembling separately prepared retaining washers and thrust washers to the bearing housing through separate operations and then assembling the rotating shaft to the bearing housing has been adopted.
JP 2003-284283 A JP 2003-97551 A JP 2002-58199 A

  However, if the above procedure is adopted, in which the retaining washer and the thrust washer are individually manufactured as separate parts and then assembled to the bearing housing through separate operations, and then the rotating shaft is assembled, in principle. Because it is necessary to carry out an assembly process corresponding to the number of three parts consisting of a retaining washer, a thrust washer, and a rotating shaft, it is difficult to reduce costs by reducing the number of assembly steps and the number of parts. It was.

  In this regard, although each of the above-mentioned Patent Documents 1 to 3 describes the individual members corresponding to the retaining washer, the thrust washer, and the rotating shaft, the above-mentioned difficulty is solved and the number of assembly steps and the number of parts are reduced. There is no disclosure about effective measures for cost reduction by reduction.

  The present invention has been made under the above circumstances, and provides a motor rotating shaft mounting structure and a motor rotating shaft mounting method in which beneficial measures are taken to reduce costs by reducing the number of assembly steps and the number of parts. The purpose is to do.

  Further, the present invention provides a bearing for a retaining washer and a thrust washer only by performing a single process of assembling a disk-shaped member made of a resin molded body to a bearing housing and a single process of assembling a rotating shaft. It is an object of the present invention to provide a motor rotating shaft mounting structure and a motor rotating shaft mounting method that can be provided at a predetermined position of a housing to exert a function of preventing a rotating shaft from being removed and a function of receiving a thrust force.

  In the motor rotating shaft mounting structure according to the present invention, a retaining washer positioned and held at the stepped portion of the bearing housing in which the radial bearing is assembled is fitted into the annular groove of the rotating shaft including the rotor, and The sliding surface of the lower end of the rotating shaft is supported by a plate-like thrust washer positioned on the bottom surface of the bearing housing. As the thrust washer, a punched piece formed by punching a central part of a disk-shaped member made of a resin molded body positioned at the stepped portion of the bearing housing is used, and as the retaining washer, the disk is used. An annular piece remaining by punching the punched piece out of the shaped member is used.

  With this configuration, the thrust washer is formed by punching the central portion of the disk-shaped member, and the retaining washer is formed by the remaining annular piece of the disk-shaped member. There is no need to make a separate washer. Moreover, since the process of punching the disk-shaped member to form the thrust washer and the retaining washer is performed with the disk-shaped member positioned at the stepped portion of the bearing housing, the thrust washer and the retaining washer are individually provided. Thus, it is not necessary to perform the process of assembling the bearing housing, and the number of assembling steps can be reduced accordingly. Although it is desirable to perform the punching process of the disk-shaped member performed to form the thrust washer and the retaining washer by using the rotating shaft when the rotating shaft is inserted into the radial bearing, It is also possible to use another punching jig other than the shaft, and any one of these means should be selected as appropriate.

  In the present invention, inwardly protruding piece portions provided at a plurality of circumferential positions spaced apart from the retaining washers protrude inward of the stepped portion of the bearing housing and are fitted into the annular groove portion of the rotating shaft. And adopting a configuration in which the thrust washers are positioned so that the outward projecting pieces provided at a plurality of locations in the circumferential direction at intervals of the thrust washers face the inner peripheral surface of the bearing housing. Is possible. According to this, the inward protruding piece portion of the retaining washer fitted in the annular groove portion of the rotating shaft regulates the axial displacement of the rotating shaft, and the rotating shaft is prevented from being removed. In addition, since the thrust washer is positioned with the outward protruding piece of the thrust washer facing the inner peripheral surface of the bearing housing, the stability of the thrust force receiving operation by the thrust washer is not impaired. In addition, by adjusting the protruding length of the inward protruding piece of the retaining washer, the fitting width of the inward protruding piece with respect to the annular groove of the rotating shaft can be adjusted to increase or decrease the stability of the retaining action and rotation. It is possible to easily maintain the smooth rotation of the shaft.

  In the present invention, as a countermeasure for forming the disk-shaped member into a circular sheet shape with a high yield with resin, the outward protruding piece of the thrust washer is adjacent to the inward protruding of the retaining washer. It is effective to adopt a configuration that has a size that fits into a recessed portion formed between the pieces.

  In the motor rotating shaft mounting structure according to the present invention, the retaining washer positioned and held in the stepped portion of the bearing housing is fitted into the annular groove portion of the rotating shaft supported by the radial bearing held in the bearing housing. And a turntable on which the lower end sliding surface of the rotating shaft is supported by a plate-shaped thrust washer positioned and positioned on the bottom surface of the bearing housing, and a disk as a recording medium is attached to and detached from the rotating shaft; In a motor rotating shaft mounting structure equipped with a rotor, the rotating shaft is supported by the radial bearing by being inserted into the radial bearing, and is positioned at the stepped portion of the bearing housing as the thrust washer. The central portion of the disk-shaped member made of the resin molded body is inserted into the radial bearing. A punched piece formed by punching using a rolling shaft is used, and an annular piece remaining by punching the punched piece from the disk-like member is used as the retaining washer, and the spacing between the retaining washers Inwardly protruding pieces provided at a plurality of locations in the circumferential direction spaced apart from each other protrude to the inside of the stepped portion of the bearing housing and are fitted into the annular groove portion of the rotating shaft, and the thrust washers are spaced apart from each other. Thrust washers are positioned with the outward protruding pieces provided at a plurality of circumferential positions facing the inner peripheral surface of the bearing housing, and the outward protruding pieces of the thrust washers are adjacent to the retaining washers. It is further embodied by adopting a configuration in which it has a size that fits into a recessed portion formed between inwardly projecting piece portions. The effect | action of this invention is demonstrated in detail with reference to embodiment mentioned later.

  In the motor rotating shaft mounting method according to the present invention, the retaining washer positioned and held at the step portion of the bearing housing is fitted into the annular groove portion of the rotating shaft supported by the radial bearing held by the bearing housing. And mounting the motor rotary shaft, the lower end sliding surface of which is supported by a plate-like thrust washer positioned and positioned on the bottom surface of the bearing housing, and the rotor is equipped with the rotor In the method, a disk-shaped member made of a resin molded body is positioned and held in a stepped portion of the bearing housing, and the disk-shaped member is rotated by the rotating shaft in the process of inserting the rotating shaft into the radial bearing. The punching piece is formed by punching the central portion of the bearing, and the punching piece is pressed against the bottom surface of the bearing housing by the rotating shaft and arranged. A thrust washer assembling step using the punched piece as a thrust washer, and a process of inserting the rotary shaft into the radial bearing to remove the annular piece remaining by punching the punched piece from the disc-shaped member with the rotary shaft. A retaining washer assembling step that is fitted into the annular groove portion of the rotating shaft to serve as a retaining washer.

  According to this mounting method, the thrust washer is formed by punching the central part of the disk-shaped member positioned at the stepped portion of the bearing housing, and the retaining washer is formed by the remaining annular piece of the disk-shaped member. This eliminates the need to manufacture the thrust washer and retaining washer separately before assembling them, and eliminates the need to individually assemble the thrust washer and retaining washer into the bearing housing. As a result, the number of assembly steps is reduced accordingly. In addition, the disk-shaped member punching process performed to form the thrust washer and the retaining washer is performed using the rotating shaft when the rotating shaft is inserted into the radial bearing. By simply performing a single process of assembling the cylindrical member and a single process of assembling the rotating shaft, the retaining washer and the thrust washer are arranged at predetermined positions of the bearing housing, and the retaining action of the rotating shaft and the thrust A motor rotating shaft mounting structure capable of exerting a force receiving action is obtained.

  The disk-shaped member used in the attachment method according to the present invention is provided in an annular region having inwardly protruding piece portions provided at a plurality of circumferentially spaced positions and a plurality of circumferentially spaced positions. A punched region having an outward protruding piece portion, and an inward protruding piece portion of the annular region and an outward protruding piece portion of the punched region are alternately positioned in the circumferential direction, and The outer peripheral end surface of the outward protruding piece portion of the punched region and the inner peripheral end surface of the recessed portion between the adjacent inward protruding piece portions of the annular region are connected by a breakable short piece portion. It is desirable to have According to this, it is possible to easily mold the disc-shaped member having the annular region and the punched region with the resin, and it is possible to easily punch the punched region with the rotating shaft.

  In the disk-shaped member used in the mounting method according to the present invention, the inner peripheral end surface of the recessed portion of the annular region is formed to be larger in diameter than the outer peripheral diameter of the rotating shaft, and the inwardly projecting piece of the annular region It is desirable that the inner peripheral end surface of the portion is formed smaller than the outer peripheral diameter of the rotating shaft and larger than the inner peripheral diameter of the annular groove portion of the rotating shaft. According to this, the inwardly protruding piece portion of the retaining washer is securely fitted into the annular groove portion of the rotating shaft, and the retaining action of the rotating shaft by the retaining washer is stabilized. Further, there is no situation where the retaining washer contacts the outer peripheral surface of the rotating shaft and the rotational smoothness of the rotating shaft is impaired.

  As described above, according to the motor rotating shaft mounting structure and the motor rotating shaft mounting method according to the present invention, the retaining washer and the thrust washer are formed by punching the central portion of one disk-shaped member. Therefore, it is not necessary to manufacture the retaining washer and the thrust washer separately or to be individually assembled to the bearing housing, so that the number of assembly steps and the number of parts can be reduced and the cost can be easily reduced. In addition, there is an effect that the mass productivity of the motor is increased by reducing the number of assembly steps and the number of parts.

  1 is a schematic longitudinal front view of a motor employing a motor rotating shaft mounting structure according to the present invention, FIG. 2 is a perspective view of a disk-shaped member 9, FIG. 3 is a plan view of the disk-shaped member 9, and FIGS. FIG. 6 is a longitudinal front view of the main part illustrating the assembly procedure, FIG. 7 is a plan view of the annular piece 9B, and FIG. 8 is a plan view of the punched piece 9A.

  As shown in FIG. 1, in the illustrated motor, a cylindrical radial bearing 2 is fitted and held in a bottomed cylindrical bearing housing 1 having a stepped portion 11 formed in an annular shape at the lower end. Further, the retaining washer 3 that is positioned and held on the stepped portion 11 of the bearing housing 1 in the radial direction and the axial direction while being sandwiched between the stepped portion 11 of the bearing housing 1 and the radial bearing 2 is provided with a radial bearing. 2 is fitted into an annular groove 41 at the lower end of the rotating shaft 4 which is inserted in the radial bearing 2 and supported in the radial direction by the radial bearing 2. Further, the lower end sliding surface 42 of the rotating shaft 4 is supported by a thrust washer 5 that is disposed on the bottom surface 12 of the bearing housing 1 and is positioned in the radial direction. A stator 6 is fixed to the bearing housing 1, whereas a rotor 7 and a turntable 8 are fixed to the rotating shaft 4.

  In this motor, when a current is supplied to the winding 61 of the stator 6, the rotor 7 having the permanent magnet 71 rotates together with the rotating shaft 4 to rotate the turntable 8. Further, the displacement width in the axial direction of the rotating shaft 4 is regulated by the retaining washer 3 fitted in the annular groove 41 of the rotating shaft 4, and the thrust force applied to the rotating shaft 4 is controlled by the thrust washer 5. It is supposed to be accepted. Then, a disk (not shown) as a recording medium is attached to and detached from the turntable 8.

  The retaining washer 3 and the thrust washer 5 shown in FIG. 1 are formed by punching a predetermined portion of the disk-shaped member 9 made of the resin molded body shown in FIGS. 2 and 3. That is, the disk-shaped member 9 is divided into an annular region 91 located on the outer peripheral side and a punched region 95 located at the inner center portion of the annular region 91, and the like. Inwardly projecting piece portions 92 are provided at three places in the circumferential direction at every angle, and outwardly projecting piece portions 96 are provided at three places in the circumferential direction at every equal angle of the punched region 95. The inward protruding piece portions 92 and the outward protruding piece portions 96 are alternately positioned in the circumferential direction, and the outer peripheral end surfaces of the outward protruding piece portions 96 and the adjacent inward protruding piece portions 92 and 92 are adjacent to each other. The inner peripheral end surfaces of the recesses 93 between each other are connected by a narrow short piece 97 that can be broken. With this configuration, the outward protruding piece 96 of the punched region 95 used as the thrust washer 5 has a size that fits into the recessed portion 93 of the annular region 91 used as the retaining washer 3. .

  This disk-shaped member 9 is made of a resin resin molded body having excellent wear resistance. The punched piece 9A (see FIG. 8) formed by breaking the short piece portion 97 of the disk-like member 9 and punching the punched region 95 is used as the thrust washer 5 of FIG. The annular piece 9B (see FIG. 7) formed by the annular region 91 remaining by punching the punched piece 9A is used as the retaining washer 3 in FIG. Accordingly, the thrust washer 5 is provided with the breakage mark 94 remaining on the annular piece 9B side of FIG. 7 as it is, and the retaining washer 3 is provided with the breakage mark 98 left on the punching piece 9A side of FIG. . Further, as can be seen by referring to FIG. 1, the retaining washer 3 is positioned in the radial direction with its outer peripheral end face facing or abutting against the inner peripheral surface of the bearing housing 1, whereas the thrust washer 5 Is positioned in the radial direction by facing the outer peripheral end surface of the outward projecting piece 96 close to the inner peripheral surface of the bearing housing 1.

  As illustrated in FIG. 3, in the disk-shaped member 9, the inner peripheral end surface of the recessed portion 93 of the annular region 91 is formed larger in diameter than the outer peripheral diameter of the rotating shaft 4 indicated by an imaginary line. The inner peripheral end surface of the inwardly protruding piece 92 of the annular region 91 is formed smaller in diameter than the outer peripheral diameter of the rotating shaft 4 indicated by the phantom line and larger in diameter than the inner peripheral diameter of the annular groove portion 41. .

  In the motor described with reference to FIG. 1, the rotating shaft 4, the retaining washer 3 and the thrust washer 5 are assembled by performing a preliminary process, a thrust washer assembling process, and a retaining washer assembling process described below. It is done.

  The preliminary step is a step of positioning and holding the disk-shaped member 9 made of the resin molded body shown in FIG. 2 or FIG. 3 at the stepped portion 11 of the bearing housing 1. 4 is sandwiched between the step portion 11 and the radial bearing 2 so as not to easily move and between the step portion 11 and the radial bearing 2 as shown in FIG.

  In the thrust washer assembling step, in the process of inserting the rotary shaft 4 into the radial bearing 2, the punched region 95 of the disk-like member 9 is pressed by the rotary shaft 4 to break the short piece 97 (see FIG. 2 or FIG. 3). To do. Therefore, in this thrust washer assembling step, the punched region 95 of the disc-like member 9 is punched at the first stage to form the punched piece 9A shown in FIG. Thus, it is pressed against the bottom surface 12 of the bearing housing 1 and disposed on the bottom surface 12 as shown in FIG. 6, and is used as the thrust washer 5. Then, as the punched piece 9A is pressed against the bottom surface 12 of the bearing housing 1 by the rotary shaft 4, the outward projecting piece 96 of the punched piece 9A faces the inner peripheral surface of the bearing housing 1 and the thrust washer 5 Positioning is performed.

  In the retaining washer assembly process, the inwardly protruding piece 92 of the annular piece 9B remaining by punching the punched piece 9A (see FIG. 8) in the thrust washer assembly process described above into the annular groove 41 of the rotary shaft 4 This is a step of fitting into the retaining washer 3. Therefore, in this retaining washer assembly step, as shown in FIG. 5, after the inwardly protruding piece 92 of the annular piece 9B is pushed and deformed by the rotating shaft 4, the punched protruding piece 92 is turned into the rotating shaft 4 as shown in FIG. After getting over the lower end of the shaft, it is restored to its initial shape by its elasticity and fitted into the annular groove 41 of the rotating shaft 4.

  By performing this mounting method, it is not necessary to separately manufacture the thrust washer 5 and the retaining washer 3 before assembling them, and the thrust washer 5 and the retaining washer 3 are individually attached to the bearing housing 1. There is no need to perform the assembly process. In addition, the punching process of the disk-like member 9 performed to form the thrust washer 5 and the retaining washer 3 is performed using the rotating shaft 4 when the rotating shaft 4 is inserted into the radial bearing 2. The retaining washer 3 and the thrust washer 5 are placed at predetermined positions of the bearing housing 1 only by performing a single process of assembling the disk-shaped member 9 to the bearing housing 1 and a single process of assembling the rotating shaft 4. It becomes possible to deploy and to exert the action of retaining the rotating shaft 4 and the function of receiving the thrust force.

  In the example described above, the inward protruding piece 92 of the annular region 91 and the outward protruding piece 96 of the punched region 95 are formed in three circumferential directions. Alternatively, the outward projecting piece portions 96 may be formed at two locations in the circumferential direction or at more locations than three in the circumferential direction. Moreover, although the process of punching out the punched area 95 is performed using the rotary shaft 4, this point is that another jig is inserted into the radial bearing 2 to punch out the punched area 95, and the jig is moved to the radial bearing. It is also possible to adopt a procedure in which the rotary shaft 4 is inserted into the radial bearing 2 after being pulled out from the radial bearing 2. However, if the rotating shaft 4 is used instead of a jig, the thrust washer 5 and the retaining washer 3 can be formed at the same time when the rotating shaft is assembled, so that the number of steps can be reduced and the mass productivity can be increased. There is an advantage of becoming.

1 is a schematic longitudinal sectional front view of a motor in which a motor rotating shaft mounting structure according to the present invention is adopted. It is a perspective view of a disk-shaped member. It is a top view of a disk-shaped member. It is the vertical side view of the principal part which showed the initial stage of the process of inserting a rotating shaft in a radial bearing explanatory. It is the vertical side view of the principal part which showed the other step of the process of inserting a rotating shaft in a radial bearing. It is the vertical side view of the principal part which showed the step which inserted the rotating shaft in the radial bearing. It is a top view of an annular piece (prevention washer). It is a top view of a punching piece (thrust washer).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bearing housing 2 Radial bearing 3 Locking washer 4 Rotating shaft 5 Thrust washer 7 Rotor 8 Turntable 9 Disk-shaped member 9A Stamping piece 9B Annular piece 11 Bearing housing step 12 Bearing housing bottom 41 Rotating shaft annular groove 42 Rotating shaft lower end sliding surface 91 Annular region 92 Inward protruding piece 95 De punched region 96 Outward protruding piece 97 Short piece

Claims (8)

A retaining washer positioned and held in the stepped portion of the bearing housing is fitted into the annular groove of the rotating shaft supported by the radial bearing held in the bearing housing, and the lower end sliding surface of the rotating shaft Is mounted on a rotating shaft supported by a plate-shaped thrust washer positioned on the bottom surface of the bearing housing and equipped with a turntable and a rotor on which a disk as a recording medium is attached to and detached from the rotating shaft. In structure
The rotary shaft is supported by the radial bearing by being inserted into the radial bearing, and as a thrust washer, a central portion of a disk-shaped member made of a resin molded body positioned at the stepped portion of the bearing housing, A punched piece formed by punching using the rotating shaft inserted into the radial bearing is used, and an annular piece remaining by punching the punched piece from the disk-shaped member is used as the retaining washer. ,
Inwardly protruding pieces provided at a plurality of circumferential locations spaced apart from the retaining washers protrude into the bearing housing stepped portion and are fitted into the annular groove of the rotating shaft, and the thrust The thrust washers are positioned so that the outward projecting pieces provided at a plurality of circumferential locations spaced apart by the washers face the inner peripheral surface of the bearing housing,
The outward protruding piece of the thrust washer is sized to fit into a recessed portion formed between adjacent inward protruding pieces of the retaining washer. Motor rotating shaft mounting structure. A retaining washer that is positioned and held in a stepped portion of the bearing housing in which the radial bearing is assembled is fitted into an annular groove portion of the rotating shaft including the rotor, and the lower end sliding surface of the rotating shaft is the bearing housing. In the mounting structure of the motor rotating shaft supported by the plate-shaped thrust washer positioned and positioned on the bottom surface of
As the thrust washer, a punched piece formed by punching a central part of a disk-shaped member made of a resin molded body positioned at the stepped portion of the bearing housing is used, and as the retaining washer, the disk-shaped member is used. A mounting structure for a motor rotating shaft, wherein an annular piece remaining by punching the punched piece is used. Inwardly protruding pieces provided at a plurality of circumferential locations spaced apart from the retaining washers protrude into the bearing housing stepped portion and are fitted into the annular groove of the rotating shaft, and the thrust A structure for mounting a motor rotating shaft, wherein thrust thrust washers are positioned so that outward projecting pieces provided at a plurality of circumferential locations spaced by washers are opposed to an inner peripheral surface of the bearing housing. The outward projection piece part of the said thrust washer has a magnitude | size which fits into the recessed part currently formed between the mutually adjacent inward projection piece parts of the said retaining washer. The mounting structure of the motor rotating shaft. A retaining washer positioned and held in the stepped portion of the bearing housing is fitted into the annular groove of the rotating shaft supported by the radial bearing held in the bearing housing, and the lower end sliding surface of the rotating shaft In the mounting method of the motor rotating shaft, which is supported by a plate-shaped thrust washer positioned and arranged on the bottom surface of the bearing housing, and the rotating shaft is equipped with a rotor,
An annular region having inwardly protruding pieces provided at a plurality of circumferentially spaced locations, and a punched region having outward protruding pieces provided at a plurality of circumferentially spaced locations. In addition, the inwardly protruding pieces of the annular region and the outwardly protruding pieces of the punched region are alternately positioned in the circumferential direction, and the outer peripheral end surface of the outwardly protruding piece of the punched region and the annular region A disc-shaped member made of a resin molded body is connected to the stepped portion of the bearing housing by connecting the inner peripheral end surfaces of the recessed portions between the adjacent inwardly protruding pieces of each other by a breakable short piece. A preliminary process for positioning and holding;
In the process of inserting the rotary shaft into the radial bearing, the punched area of the disk-shaped member is pressed by the rotary shaft to break the short piece portion, thereby punching the punched area to form a punched piece, A thrust washer assembling step in which the punched piece is used as a thrust washer by pressing the punched piece against the bottom surface of the bearing housing by a rotating shaft;
In the process of inserting the rotary shaft into the radial bearing, the inwardly projecting piece of the annular piece remaining by punching out the punched piece from the disk-like member by the rotary shaft is fitted into the annular groove portion of the rotary shaft. A retaining washer assembling process for securing the retaining washer,
The inner peripheral end surface of the recessed portion of the annular region is formed larger in diameter than the outer peripheral diameter of the rotating shaft, and the inner peripheral end surface of the inwardly protruding piece portion of the annular region is smaller in diameter than the outer peripheral diameter of the rotating shaft. And is formed larger in diameter than the inner peripheral diameter of the annular groove portion of the rotating shaft,
In the retaining washer assembling step, the inwardly protruding piece is bent and deformed to get over the lower end of the rotating shaft, and then restored to its initial shape by its elasticity and fitted into the annular groove of the rotating shaft. A motor rotating shaft mounting method characterized by the above. A retaining washer positioned and held in the stepped portion of the bearing housing is fitted into the annular groove of the rotating shaft supported by the radial bearing held in the bearing housing, and the lower end of the rotating shaft slides. In the mounting method of the motor rotating shaft, the surface of which is supported by a plate-shaped thrust washer positioned and positioned on the bottom surface of the bearing housing, and the rotor is mounted on the rotating shaft.
A preliminary step of positioning and holding a disk-shaped member made of a resin molded body at the stepped portion of the bearing housing;
In the process of inserting the rotary shaft into the radial bearing, the rotary shaft is used to punch out the central portion of the disk-shaped member to form a punched piece, and the punched piece is pressed against the bottom surface of the bearing housing through the rotary shaft. A thrust washer assembling step using the punched piece as a thrust washer,
In the process of inserting the rotary shaft into the radial bearing, the annular piece remaining by punching out the punched piece from the disk-like member by the rotary shaft is fitted into the annular groove portion of the rotary shaft to form a retaining washer. The retaining washer assembly process,
A method for mounting a motor rotating shaft, comprising: The disk-shaped member includes an annular region having inwardly protruding pieces provided at a plurality of circumferentially spaced locations, and a cover having outwardly protruding piece portions provided at a plurality of circumferentially spaced locations. An inward protruding piece of the annular region and an outward protruding piece of the punched region are alternately positioned in the circumferential direction, and the outward protruding piece of the punched region The motor rotating shaft mounting method according to claim 6, wherein the outer peripheral end face of the portion and the inner peripheral end face of the recessed portion between adjacent inwardly protruding pieces in the annular region are connected by a breakable short piece. . In the disk-shaped member, an inner peripheral end surface of the recessed portion of the annular region is formed larger than an outer peripheral diameter of the rotating shaft, and an inner peripheral end surface of the inwardly projecting piece portion of the annular region is the rotating shaft. The motor rotating shaft mounting method according to claim 7, wherein the motor rotating shaft is formed to have a diameter smaller than an outer peripheral diameter thereof and larger than an inner peripheral diameter of the annular groove portion of the rotating shaft.

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