JPS6213404Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a structure for mounting a drive motor in a time meter that uses a synchronous motor as a drive source to measure the operating time of equipment.

Conventionally, the mounting structure of this type of drive motor was
This will be explained using the time meter shown in the figure. This type of time meter includes a conventionally well-known counter section 1, a synchronous motor 2 which serves as a drive source for the counter section 1, and a counter section 1 which is interposed between the counter section 1 and the synchronous motor 2 and which is connected to the rotation of the synchronous motor 2. and a reduction gear mechanism section 3 that reduces the rotation speed to a predetermined rotational speed and transmits the speed to the counter section 1.

The counter section 1 has a plurality of number wheels 7 and a shift pinion 8 rotatably supported between side plates 5 and 6 protruding from a disc-shaped bottom plate 4,
The worm gear 9 passing through the bottom plate 4 transmits the rotation of the synchronous motor 2 to the number wheel 7 via the reduction gear mechanism 3, so that the usage time of the device is displayed. Note that 10 is an operation display member meshed with the worm gear 9 to indicate that the hour meter is in an operating state.

Further, on the lower surface of the bottom plate 4 of the counter section 1,
A plurality of distance rods 11 formed in a hollow cylindrical shape are protruded so as to be located on the same circumference, and tightening screws 12 inserted into these distance rods 11 are attached to the distance. The tip of the rod 11 is screwed into a screw hole in the support plate 13 arranged parallel to the bottom plate 4, and the tip of the screw 12 is inserted into the top cover 14 of the synchronous motor 2 below the support plate 13. The synchronous motor 2 is screwed into the provided screw hole, thereby fixing the synchronous motor 2 to the lower side of the support plate 13. In addition, 15 is a cylindrical projection provided on the lower surface of the support plate 13, and this projection 15
is for forming a screw hole in the support plate 13. Further, a motor shaft (not shown) of the synchronous motor 2 is projected above the support plate 13 from an opening made in the center of the support plate 13, and this motor shaft is connected to the bottom plate 4 of the counter section 1 and the support plate 13. It meshes with a plurality of reduction gears 16 constituting the reduction gear mechanism section 3 disposed between the plate 13 and these reduction gears 16 transmit rotation to the counter section 1 .

In a conventional time meter configured in this way,
With the reduction gear 16 assembled between the bottom plate 4 and the support plate 13 of the counter part 1, the screw 12 inserted into the distance rod 11 is screwed into the screw hole of the support plate 13, and the bottom plate 4 is attached to the support plate. 13, align these screws 12 with the screw holes in the top cover 14 of the synchronous motor 2, and screw the screws 12 into the screw holes to attach the synchronous motor 2 to the support plate 1.
I had to fix it at 3. Therefore,
The installation work of such a synchronous motor has the disadvantage that the work of positioning, screwing, etc. is extremely troublesome.

In addition, since the synchronous motor 2 is fixed to the support plate 13 by screwing the screw 12 into the screw hole of the upper cover 15 of the synchronous motor 2, chips are generated when screwing in, and these chips enter the inside of the synchronous motor 2 and cause the rotor to be damaged. The synchronous motor adheres to the surface of the synchronous motor, obstructs the rotation of the rotor, prevents the synchronous motor from rotating accurately, and causes the synchronous motor to malfunction.

In view of the above, the present invention provides a mounting structure for a drive motor in an hour meter, which comprises at least a pair of hooks protruding from the mounting surface side of a support plate to which the motor is attached, the hooks facing each other across an opening through which the motor shaft is inserted and having claws protruding in the same rotational direction around the opening, and threaded holes drilled near the hooks, the claws of the hooks being hooked onto the side edges of a cutout portion drilled in the top cover of the motor, and the tip of a fastening screw threaded into the threaded hole in the support plate is fitted into a fitting hole previously drilled in the top cover of the motor, thereby allowing the synchronous motor to be mounted and fixed to the support plate simply and reliably and preventing the generation of cutting chips which may cause the motor to malfunction. The present invention will be described in detail below with reference to the embodiment shown in the drawings.

2 and 3 show an embodiment of a time meter to which the drive motor mounting structure according to the present invention is applied, and the same parts as in FIG. 1 are given the same numbers.

Now, according to the present invention, as shown in FIGS. 2 and 3, the support plate 20 supporting the reduction gear mechanism 3 is integrally formed of a synthetic resin material so as to have a substantially disk shape as a whole, An opening 22 is bored in the center thereof, through which a motor shaft 21 of a synchronous motor 2, which will be described later, passes through to the reduction gear mechanism 3 side. A semi-annular protrusion 23 is protruded around the opening 22 and is configured to position the motor shaft 21 and the synchronous motor 2 inserted into the opening 22. Furthermore, cylindrical protrusions 25 having screw holes 24 are formed at positions corresponding to two of the plurality of distance rods 11 protruding from the bottom plate 4 of the counter section 1. The support plate 20 is mounted parallel to the bottom plate 4 by means of tightening screws 12 inserted into the distance rods 11. In addition, hooking portions 2 each having a substantially L-shaped cross section are provided near the two protrusions 25.
Reference numerals 6 and 27 are for hooking on the top cover 14 of the synchronous motor 2, and these hooking parts 26 and 27 are located on the same circumference on the back surface of the support plate 20, and the claws 26a and 27a at the tips thereof are Opening 2 of this support plate 20
2 and protrudes in the same rotational direction.
In this case, the claws 26 of these hooks 26 and 27
a, 27a are slightly inclined toward the bottom of the support plate 20. In addition, 28 and 29 are hook parts 26 and 27
30 is a hole for punching to form a die, and 30 is a bearing hole for supporting the reduction gear 16.

On the other hand, the synchronous motor 2 attached to the lower side of the support plate 20 is, as shown in FIG. A coil bobbin 32 around which an excitation coil (not shown) is wound, a rotor (not shown), etc. are disposed within the frame 31, and a top cover 33 made of a magnetic material is also fixed to the top of the frame 31. . The motor shaft 21 of the synchronous motor 2 projects from the center of the upper lid 33, and a gear 34 is fixed to the tip thereof. As shown in FIG. 2, the gear 34 projects above the support plate 20 from the opening 22 of the support plate 20 and meshes with the reduction gear 16. Further, as shown in FIG. 3, the upper lid 33 is made of a synthetic resin that is fitted into the inner circumferential surface of a protrusion 23 located around the motor shaft 21 and protruding from the center portion of the support plate 20. A ring body 35 made of wood is fixed, and the motor shaft 21 of the synchronous motor 2 and the opening 22 of the support plate 20 are connected by this ring body 35 and the protrusion 23.
It is configured to perform positioning with.

Further, the upper cover 33 of the synchronous motor 2 has a third
As shown in the figure, a plurality of notches 37a, 37 are formed in a radial direction centering on the motor shaft 21.
b,...,37f are drilled at equal intervals,
Stator pieces 38a, 38b,..., formed by these notches 37a, 37b,..., 37f.
38f is bent downward so as to be located between the coil bobbin 32 and the rotor.

2 of the notches 37a, 37b,...37f
The notches 37a, 37d correspond to the hooks 26, 27 of the support plate 20, and the claws 26a, 27a is configured to be hooked. Therefore, in the synchronous motor 2, a gap is formed between the upper cover 33 and the coil bobbin 32 to the extent that the claws 26a, 27a of the hooks 26, 27 can be fitted therein.

Further, the upper lid 33 has notches 37a and 37d.
Fitting holes 39 and 40 are formed in the side edges of the support plate 20 to face the protrusions 25 having the screw holes 24 of the support plate 20 when the hooks 26a and 27a of the hooks 26 and 27 are hooked. These fitting holes 39 and 40 are provided with tightening screws 1 screwed into the screw holes 24 of the support plate 20.
The locking portions 26 and 27 are formed slightly larger than the outer diameter of the tightening screw 12 so that the tips of the screws 2 and 2 can be fitted into the fitting holes 39 and 40. claw 26a,
The synchronous motor 2 hooked to the support plate 27a
This is to prevent it from coming off the claws 26a and 27a.

In the hour meter according to the present invention configured as described above, the synchronous motor 2 is connected to the support plate 20 in the following manner.
mounted on. In this case, the assembly of the counter section 1 and the reduction gear mechanism section 3 is the same as the conventional one, and the counter section 1 is assembled with a plurality of reduction gears 16 assembled between the bottom plate 4 and the support plate 20 of the counter section 1. The tightening screw 12 is inserted into the distance rod 11 and screwed into the screw hole 24 of the protrusion 25 of the support plate 20. Incidentally, the length of the tightening screw 12 is formed to be slightly longer than the length of the distance rod 11, as in the conventional case. In addition, the tightening screw 12 is attached to the support plate 20.
When screwing in, the tightening screw 12 is not completely screwed in, but is temporarily tightened to such an extent that the tip of the tightening screw 12 does not protrude from the tip of the protrusion 25 having the screw hole 24.

Now, in the present invention, in order to attach the synchronous motor 2 to the lower side of the support plate 20, first, the ring body 35 on the upper cover 33 of the synchronous motor 2 is fitted into the inner peripheral surface of the protrusion 23 of the support plate 20, and the gear gear 34 is inserted through the opening 22 and engaged with the reduction gear 16, and the hooks 26 and 27 of the support plate 20 are inserted into the motor through the notches 37a and 37d of the upper cover 33 of the synchronous motor 2. is assembled to the lower side of the support plate 20. Then, in this state, the synchronous motor 2 is rotated counterclockwise with respect to the support plate 20, and the claws 2 of the hooking parts 26, 27 are rotated.
6a, 27a are hooked onto the side edges of the notches 37a, 37d. Therefore, the synchronous motor 2
Movement in the axial direction is restricted relative to 0. after that,
The temporarily fastened tightening screw 12 is completely tightened and its tip is fitted into the fitting holes 39 and 40 of the upper cover 33 of the synchronous motor 2. Thereby, the rotation of the synchronous motor 2 with respect to the support plate 20 is restricted, and the synchronous motor 2 will not rotate clockwise and come off the support plate 20. Therefore, the synchronous motor 2
It is securely fixed to the lower side of 0.

In addition, according to the embodiment, the case where the support plate 20 is integrally molded from a synthetic resin material has been described, but the present invention is not limited to this, and the support plate may be made of, for example, a metal material.

Further, in the embodiment, the hooking portion 2 of the support plate 20 is
Although the claws 26a and 27a of 6 and 27 are formed to be inclined downward so that they can be easily fitted into the side edges of the notches 37a and 37d of the synchronous motor 2, the present invention is not limited thereto.

As explained above, according to the present invention, the mounting surface of the support plate for fixing the drive motor has a claw that is hooked to the side edge of the notch for forming the stator piece formed in the upper cover of the motor. A latching part and a screw hole into which a screw for fixing the support plate to the counter part side is screwed are formed, and the claw of the latching part is hooked to the top cover of the motor and is screwed into the screw hole. Since the tip of the screw fits into the fitting hole pre-drilled in the top cover of the motor, it is possible to securely fix the motor to the support plate with a simple structure, and it is possible to align the motor like before. This has the advantage that it is not troublesome and the installation work can be done easily. Further, according to the present invention, there is no need to screw the top cover of the motor as in the conventional case, so there is an advantage that chips that may cause motor failure are not generated.

Furthermore, according to the present invention, when installing the motor, the notch for forming the stator piece in the motor top cover and the screws that fix the counter part and the support plate are skillfully used, so special mounting members are required. It has the advantage that the entire structure can be made compact without the need for other parts, and that each part can be made into a unit and can be attached and detached individually.

[Brief explanation of the drawing]

FIG. 1 is a front view showing the mounting structure of a drive motor in a conventional hour meter, and FIG. 2 is a partially cutaway front view showing an embodiment of the hour meter to which the drive motor mounting structure of the present invention is applied. FIG. 3 is an exploded perspective view showing the mounting portion of the motor. 2...Synchronous motor, 20...Support plate, 21...
Motor shaft, 22... Opening, 24... Screw hole, 25
...Protrusion, 26, 27...Latching portion, 33...Top lid, 37...Notch, 39, 40...Fitting hole.

Claims (1)

[Scope of utility model registration request] A counter part, a driving force transmission mechanism part supported on a support plate disposed parallel to the lower part of the bottom plate of the counter part via a distance rod and fixed with screws, and a driving force transmission mechanism part supported on a support plate fixed to the bottom plate by a screw. In the hour meter, the hour meter includes a motor fixed to the lower side of the support plate such that the motor shaft protrudes toward the driving force transmission mechanism side from the opening provided in the hour meter, and the time meter includes a motor fixed to the lower side of the support plate such that the motor shaft protrudes toward the driving force transmission mechanism side through the opening provided in the hour meter. and at least a pair of hooks having claws facing in the same rotational direction with the opening as the center, and a screw hole drilled near these hooks into which a screw connecting the counter portion is inserted. is formed, and the hook of the hook is hooked on the side edge of a notch formed on the top cover of the motor to cut and raise the stator piece, and the hook is inserted into the motor so as to correspond to the screw hole. A mounting structure for a drive motor in an hour meter, characterized in that the tip of a screw screwed into the screw is fitted into a fitting hole drilled in a top cover.