JP2529450Y2 - Mounting structure of thrust support on armature shaft - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting structure of a thrust receiver on an armature shaft used for electric components and the like.

[0002]

2. Description of the Related Art
A thrust load of an armature shaft (motor shaft) protruding from a case frame of a motor of this type is elastically received by a thrust receiving member having rubber elasticity incorporated at a tip end side of the armature shaft. However,
In this case, for example, as shown in FIG. 8, a thrust damper 13 and a thrust plate 14 which are thrust receiving members
Was inserted and assembled from a direction coinciding with the axis of the armature shaft 2. However, in order to achieve this, the concave groove-shaped mounting portion for inserting and mounting the thrust damper 13 and the thrust plate 14 has to be opened in the axial direction of the armature shaft. In order to form such a mold, it is necessary to use a pin-shaped mold material that can be inserted and removed in the direction along the axis of the armature shaft, which significantly complicates the mold structure and reduces the diameter of the built-in part. There is a problem that there is a limit to increase the size, and it is difficult to receive a sufficient thrust load.

Therefore, as shown in Japanese Utility Model Publication No. Sho 62-4725, a thrust receiver made of a bush or the like is used as an assembling body, and this is assembled into a recess formed in a case frame from a direction orthogonal to an armature shaft. It is suggested that you can do it. However, in this case, since the concave portion is also open on the armature shaft side, there is a problem that the temporary holding of the assembled body in the concave portion is insufficient, and it easily falls off. Further improvement is required.

[0004]

SUMMARY OF THE INVENTION The present invention has been conceived in view of the above-mentioned circumstances, and has an object to provide a mounting structure of a thrust receiver on an armature shaft which can eliminate these disadvantages. A thrust receiving member for receiving a thrust load of the armature shaft is mounted on a case frame in which a large opening is formed in one direction orthogonal to the axis of the armature shaft and the large opening is closed by a cover body; Is assembled into the case frame as an assembly housed in the holder member, the cover body side is opened in the case frame so as to serve as a built-in insertion opening of the assembly body, and the armature shaft side wall is provided with the armature shaft. A notch-shaped holder holding portion that is cut out so as to penetrate is formed, and the holder member is orthogonal to the axis of the armature shaft. The holder member is inserted into the holder holding portion from the opening side, and the holder member is integrally formed with a rib portion which comes into contact with the cover body in a state where the rib member is installed in the holder holding portion. .

According to the present invention, the construction of the thrust receiver can be made simple and reliable with good workability.

[0006]

Next, an embodiment of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 denotes a case frame of an electric component motor, and the case frame 1 has an upper large opening 1.
a, the wheel body 4 meshes with gear teeth 2a formed at the tip of an armature shaft (motor shaft) 2 in the case frame 1. The output shaft 5 integrally provided with the wheel 4 is configured to protrude from the case frame 1 and the like, as in any conventional case.

[0007] Numeral 6 denotes a thrust receiving unit, which is an assembling body which is assembled on the tip end side of the armature shaft 2 from the upper opening in a direction perpendicular to the axis of the armature shaft 2, and the thrust receiving unit. Reference numeral 6 is constituted by accommodating and incorporating a flat thrust plate 8 and a cylindrical thrust damper 9 (both members corresponding to the thrust receiver of the present invention) into a holder member 7. The holder member 7 has a box shape that is open at both ends in the vertical direction and is partitioned at the middle, and has a notch 7a on the side surface facing the tip of the armature shaft 2 so that the tip can be loosely fitted.
Are formed, and the notch peripheral portion of the notch locks the accommodated thrust plate 8 and thrust damper 9. Further, a rib portion 7b is formed on the ceiling surface (upper surface) to be supported by the cover body 3 when inserted into the holder holding portion 12 as described later. And
On one bottom surface of the thrust damper 9 incorporated in the holder member 7, an auxiliary elastic portion 9 a is formed in a projecting shape with a dimension set to protrude beyond the space where the thrust damper 9 is accommodated in the holder member 7 and elastically deform. It is set so as to exert an elastic stress smaller than that corresponding to the thrust load.

Further, a holder holding portion 12 for inserting and incorporating the thrust receiving unit 6 into the case frame 1 is provided.
The holder holding portion 12 is formed in a concave shape (box shape) which is opened on the upper surface side facing the cover body 3 so as to serve as the insertion opening 12a of the holder member 7, and the armature shaft 2 is provided. The side wall 12b is formed with a notch 12c having a substantially U-shape which is open on the cover body 3 side so that the tip of the armature shaft 2 penetrates. The thrust receiving unit 6 inserts the holder member 7 into the insertion opening 12a from the side of the large opening 1a orthogonal to the axis of the armature shaft 2.
By inserting and assembling into the holder holding portion 12, it is temporarily assembled while being surrounded and held by the four side wall portions of the holder holding portion 12. In forming the holder holding portion 12, either the side wall is formed so as to protrude from the bottom surface of the case frame 1, or the side wall is partially formed by the peripheral wall of the case frame 1. Is also good.

In the embodiment of the present invention configured as described above, a thrust receiving unit 6 in which a thrust plate 8 and a thrust damper 9 are preliminarily assembled in a holder member 7 in advance in a case frame 1 is provided on a shaft of the armature shaft 2. The thrust receiving unit 6 inserted and assembled into the holder holding portion 12 of the case frame 1 from a direction perpendicular to the center of the case frame 1 so that the distal end of the armature shaft 2 penetrates. Although the substantially U-shaped notch 12c is cut out in the side wall 12b on the side, the side wall 12b is surrounded by four peripheral side wall portions and is temporarily assembled in a temporarily held state by press-fitting. As a result, the thrust receiving unit 6 is reliably prevented from being displaced or dropped in the middle of assembling before the large opening 1a is covered with the cover body 3, and easy to assemble with high reliability. Can be.

As described above, in the embodiment in which the present invention is implemented, the thrust receiving unit 6 can be temporarily assembled without any displacement of the thrust receiving unit 6 to the case frame 1. However, the holder holding section 12 for temporarily installing the thrust receiving unit 6 has an armature. Since the insertion opening 12a is formed by opening in the direction perpendicular to the axis 2, it is not necessary to form a complicated mold structure when molding the case frame.

Further, in this case, the holder member 7 has a notch 7a formed in a side surface of the armature shaft 2 so that the tip of the armature shaft 2 is loosely fitted therein, and a thrust plate 8 in which a peripheral portion of the notch 7a is accommodated. Since the damper 9 is retained and locked, the thrust plate 8 and the thrust damper 9 do not fall out of the cutout side of the thrust receiving unit 6 formed and assembled.

Further, in this device, an auxiliary elastic portion 9a is formed on the thrust damper 9, and the thrust damper 9 is formed.
Is stored in the holder member 7 together with the thrust plate 8, the auxiliary elastic portion 9 a is elastically deformed so as not to be displaced from the holder member 7. As a result, the thrust damper 9 and the thrust plate 8 open downward. As a result, the thrust receiving unit 6 that does not displace or fall off of these members can be incorporated into the case frame 1, and the reliability can be improved.

Moreover, in this case, the thrust damper 9,
The displacement of the thrust plate 8 is prevented, but the displacement is prevented by setting the dimensions of the main body of the thrust damper 9 which receives the thrust load so as to be slightly larger than the damper accommodating space of the holder member 7. The auxiliary elastic portion 9a is formed by forming the auxiliary elastic portion 9a instead of the auxiliary elastic portion 9a. Therefore, the auxiliary elastic portion 9a is weaker than the elastic stress corresponding to the thrust load and is weak enough to exhibit the displacement prevention function. Therefore, it is not necessary to set the size of the auxiliary elastic portion 9a to a high accuracy corresponding to the damper accommodating space as in the case where the displacement is prevented by the elastic force of the thrust damper 9 main body. In addition, since the thrust damper 9 can be set smaller than the damper accommodating space, the thrust damper 9 can be easily incorporated into the holder member 7 and the workability in assembling the unit 6 can be improved. Will be.

It should be noted that the present invention is not limited to the above-described embodiment, and the notch 12c formed in the side wall of the holder holding portion on the armature shaft side is not limited to the holder member 7. Is only required to be retained on the armature shaft 2 side.
The size is appropriately changed in accordance with the tip of the armature shaft that penetrates the side wall in a loose fit manner.
The armature shaft may be biased toward one of the side walls parallel to the axis of the armature shaft. Further, the configuration in which the auxiliary elastic portion is formed in the thrust damper is not limited to that of the above-described embodiment, and is similar to the thrust dampers 10 and 11 of the second and third embodiments shown in FIGS. In addition, the auxiliary elastic portions 10a and 11a can be various types such as those formed by cutting in the middle and those formed by flanges.

[0015]

[Effects] In summary, since the present invention is constructed as described above, the thrust receiving member composed of the thrust plate and the thrust damper is used as an assembly temporarily pre-assembled in the holder member. The assembly is inserted into the holder holder, but is assembled from a direction perpendicular to the axis of the armature shaft, and is temporarily assembled in a temporary holding state surrounded by the four side walls of the holder holder. Will be. Therefore, it is possible to reliably prevent the thrust assembly from being displaced or falling off during the halfway of the assembly before the cover body covers the large opening, and to make the assembly work highly reliable. Moreover, the assembling work can be made easy. In addition, since the holder holding portion formed on the case frame is configured to be opened in a direction perpendicular to the armature axis and serves as an insertion port, there is no need to use a complicated mold structure when molding the case frame. .

[Brief description of the drawings]

FIG. 1 is a front view of a motor for electrical components.

FIG. 2 is a cross-sectional view of a main part of the electric component motor.

3A is a sectional view of a holder member, FIG. 3B is a partial sectional side view of the holder member, and FIG. 3C is a rear view of the holder member.

FIG. 4 is an enlarged perspective view of a holder holding unit.

FIG. 5 is a perspective view of a thrust damper.

FIG. 6 is a perspective view of a thrust damper according to a second embodiment.

FIG. 7 is a side view of a thrust damper according to a third embodiment.

FIG. 8 is a sectional view of a main part of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Case frame 1a Large opening 2 Armature shaft 4 Wheel 6 Thrust receiving unit 7 Holder member 7a Notch 8 Thrust plate 9 Thrust damper 9a Auxiliary elastic part 12 Holder holding part 12a Insertion opening 12b Side wall 12c Notch

Claims (2)

(57) [Scope of request for utility model registration] 1. A thrust receiver for receiving a thrust load of an armature shaft is mounted on a case frame having a large opening in one direction orthogonal to the axis of the armature shaft and the large opening being closed by a cover body. When assembling the thrust receiver into the case frame as an assembly housed in the holder member, the cover body side is opened in the case frame so as to serve as an installation insertion opening of the assembly body, and the side wall on the armature shaft side is provided. A recessed holder holder that is cut out so that the armature shaft passes therethrough is formed, and the holder member is inserted into the holder holder from a large opening side orthogonal to the axis of the armature shaft, and is further incorporated in the holder holder. Wherein a rib portion which comes into contact with the cover body in a state of being incorporated in the holder holding portion is integrally formed. Mounting structure of thrust receiver on shaft. 2. The thrust receiver according to claim 1,
A thrust plate and a thrust damper, wherein the thrust damper is provided with an auxiliary elastic portion having an elastic stress smaller than that corresponding to a thrust load, and the thrust plate and the thrust damper with respect to a holder member. A mounting structure for a thrust receiver on an armature shaft, which is configured to prevent positional displacement.