JP3046528B2 - Motor holding structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor block which includes a motor for driving a mechanism for a timepiece and a gear for reducing the rotation of the timepiece, and more particularly to a structure for holding the motor.

[0002]

2. Description of the Related Art FIGS. 7 to 12 show a conventional motor holding structure of this kind. The motor block in this holding structure accommodates and holds the motor 8 in a housing 6 composed of a first main plate 2 and a second main plate 4 divided from substantially the center of the side surface. This first base plate 2
Are provided with engaging projections 2e to 2g at substantially the centers of the three side surfaces 2b to 2d, respectively.
Three side surfaces 4 corresponding to the first main plate 2 are provided on the side surfaces of the main plate 4.
At the center of b to 4d, engagement arms 4e to 4g each having a substantially U shape are provided. The engagement arms 4e to 4e
g protrudes in the direction of engagement with the first base plate 2, and by assembling the first base plate 2 so as to cover the second base plate 4, the engagement arms 4 e to 4 g respectively engage with the engagement protrusions 2 e to 2 g. , The first base plate 2 and the second base plate 4 are integrated. In this conventional motor holding structure, the terminal 8 of the motor 8 is attached to the remaining side surfaces 2a, 4a of the first and second base plates 2, 4.
a, 8b and notches 2h, 4h for escaping the support 8c for supporting the rotary shaft.
The main plate 2 projects into the notch 2h, stops the rotation of the motor 8 with the support 8c of the motor 8 interposed therebetween, and performs positioning.
The projecting pieces 2i and 2j are provided. In addition,
The first and second base plates 2 and 4 are provided with protrusions 2k and 4k, respectively, between the protruding pieces 2i and 2j to prevent generation of play due to the floating of the motor 8.

[0003]

The first and second base plates 2 and 4 in the conventional motor holding structure have three of the four side surfaces, the engagement protrusions 2e to 2g and the engagement arms 4 and 4.
e to 4g, respectively, but the engaging portions are not provided on the side surfaces from which the terminals 8a, 8b and the support portions 8c of the motor 8 protrude, so that the first and second base plates 2, 4 sometimes occurred. For this reason, fixing portions 2m and 4m for fixing with screws were provided at the corners of the first and second base plates 2 and 4, and these had to be fixed with screws.

Further, in the case of a small motor block, the motor 8 is located at the very side of the side, so that it is not possible to provide an engaging projection or an engaging arm on the side from which the end of the motor 8 projects. In order to provide them, the motor block had to be enlarged.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and has as its object to engage the first and second base plates on all side surfaces without increasing the size of the motor block, thereby providing a more rigid structure. An object of the present invention is to provide a motor holding structure capable of holding a motor.

[0006]

A motor holding structure according to the present invention is provided on a side surface of a first base plate in a motor block for holding a motor in a housing formed by assembling first and second base plates. An engaging protrusion provided on a side surface of the second base plate, protruding in the direction of the first base plate and engaging with the engaging protrusion, an end of the motor provided on the engaging arm, and an end of the motor. And a window adapted to the part.

[0007]

In the motor holding structure of the present invention, the first and second base plates are provided with an engagement projection and an engagement arm on all the side surfaces to be engaged. In particular, the engaging arm provided on the side from which the end of the motor protrudes is provided with a window adapted to the end of the motor, and the rotation is stopped and positioned by fitting the end of the motor into this window. ing.

[0008]

1 to 6 are a left side view, a front view, a rear view, a plan view and a bottom view of a motor block according to an embodiment of the present invention. In the drawing, reference numerals 12 and 14 denote a first main plate and a second main plate, respectively, and 16 denotes a housing formed by assembling the first and second main plates 12 and 14, which accommodates and holds a motor 18 therein. ing. The first and second base plates 12 and 14 have a shape in which the housing 16 is divided at substantially the center of the side surface, as in the above-described conventional example. The first main plate 12 in the present embodiment has engagement protrusions 12e to 12
h are provided respectively. The second base plate 14 is provided with substantially U-shaped engagement arms 14e to 14h substantially at the centers of the side surfaces 14a to 14d engaged with the first base plate 12, respectively. These engagement arms 14e to 14h
Also protrudes in the direction of engagement with the first base plate 12, and when assembled so as to cover the first base plate 12 with the second base plate 14, the tips of the engagement arms 14e to 14h become the engagement protrusions 12e to 12h.
h, the first and second base plates 12, 14 are integrated by engaging with the lower surfaces of the engagement protrusions 12e to 12h.

The engaging arm 14e of the second base plate 14 in this embodiment has a window 14i at the center thereof.
4i is set to a width suitable for the support portion 18c of the rotating shaft of the motor 18. Therefore, when the engagement arm 14e and the engagement protrusion 12e are engaged, the engagement arm 14e
The supporting portion 18c of the motor 18 protruding into the position of (1) protrudes into the window 14i of the engaging arm 14e, and is further fitted into the window 14i to stop the rotation thereof and is positioned. Note that the support portion 18c of the motor 18 in the present embodiment has a substantially cylindrical shape, and a part of the outer periphery thereof is cut to form a flat surface 18d. When the flat surface 18d contacts the edge of the window 14i of the engagement arm 14e, the motor 1
8 is blocked.

In this embodiment, as in the prior art, notches 12j and 14j for escaping the terminals 18a and 18b of the motor 18 are provided on the side surfaces 12a and 14a. Projections 12k and 14k are provided behind the engagement projection 12e and inside the window 14i, respectively, in order to prevent the occurrence of backlash caused by the lifting of 18.

[0011]

According to the present invention, since the motor is positioned by sandwiching the end of the motor between the windows of the engagement arm, the snap-fit structure by the engagement arm and the engagement projection and the motor positioning structure are provided. The first and second main plates can be fixed and integrated without increasing the size of the motor block.

In particular, in the first and second base plates, the portion for holding and positioning the motor can be firmly fixed and integrated, so that the first and second base plates do not float, and the rotation of the motor does not occur. Problems such as vibration and noise can be prevented from occurring.

[Brief description of the drawings]

FIG. 1 is a left side view of a motor block according to an embodiment of the present invention.

FIG. 2 is a right side view of the motor block shown in FIG.

FIG. 3 is a front view of the motor block shown in FIG. 1;

FIG. 4 is a rear view of the motor block shown in FIG. 1;

FIG. 5 is a plan view of the motor block shown in FIG. 1;

FIG. 6 is a bottom view of the motor block shown in FIG. 1;

FIG. 7 is a left side view of a conventional motor block.

FIG. 8 is a right side view of the motor block shown in FIG. 7;

FIG. 9 is a front view of the motor block shown in FIG. 7;

FIG. 10 is a rear view of the motor block shown in FIG. 7;

FIG. 11 is a plan view of the motor block shown in FIG. 7;

FIG. 12 is a bottom view of the motor block shown in FIG. 7;

[Explanation of symbols]

 12 First ground plate 12a to 12d Side surface 12e to 12h Engagement projection 14 Second ground plate 14a to 14d Side surface 14e to 14h Engagement arm 16 Housing 18 Motor

──────────────────────────────────────────────────続 き Continuation of front page (58) Fields investigated (Int. Cl. ⁷ , DB name) G04B 29/04 G04B 45/00 G04C 3/00 G04C 23/00-23/50

Claims (1)

(57) [Claims] 1. A motor block for holding a motor in a housing formed by assembling first and second base plates, wherein: an engagement protrusion provided on a side surface of the first base plate; and a side surface of the second base plate. An engagement arm protruding in the direction of the first base plate and engaging with the engagement protrusion; and a window provided on the engagement arm and adapted to an end of the motor. A motor holding structure, wherein a joint arm is engaged with the engaging projection to fix the first and second base plates, and an end of the motor is fitted into the window to position the motor.