JPS5836222Y2 - Support structure for small watch motors - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a support structure for a small motor for a watch.

In this type of small watch motor, when the stator plate and the coil core plate are separate parts, the stator plate and the coil core plate are conventionally connected via a coupling means such as screw coupling, caulking coupling, or spot welding. This unitizes the stator plate and coil core plate, and the unitized stator plate and coil core plate are further disposed on the base plate using screws or the like.

This increases the assembly process, and the magnetic resistance of the stator plate and coil core plate is increased due to the holes drilled in the stator plate and coil core plate for screw connection and caulking connection, or changes in the structure due to heat during spot welding. increased, and the magnetic efficiency decreased.

Furthermore, motors with an integrated stator structure in which the magnetic field generating parts are connected via a narrow part have the disadvantage of inherently lower magnetic efficiency than motors with a general separate stator structure in which the magnetic field generating parts are separated. are doing.

For this reason, in a motor having an integral stator structure, a reduction in magnetic efficiency due to holes for screw connection or caulking connection, or spot welding becomes a particularly serious problem.

The present invention is intended to eliminate the above-mentioned drawbacks of the conventional art, and one embodiment thereof will be described below with reference to the drawings.

In FIGS. 1 and 2, 1 and 2 are an upper plate and a base plate as supporting plates made of synthetic resin,
A timepiece wheel train A is disposed between these two base plates.

The clock wheel train A has a well-known wheel train configuration consisting of a second wheel 3, a third wheel 4, an intermediate wheel 5, a minute wheel 6, a minute wheel 7, an hour wheel 8, and a hand wheel 9. .

B is a small watch motor that drives the watch wheel train A,
A rotor 10 meshing with the second wheel 3, a stator plate 11 magnetically coupled to the rotor. It is separated from a coil core plate 12 connected to the stator plate, a coil bobbin 13 mounted on the coil core plate, and a drive coil 14 wound around the coil bobbin and exciting the coil core plate 12.

Leg portions 13a are integrally formed on the coil bobbin 13, and a circuit board 15 is fixed to the leg portions.

The stator plate 11 has a magnetic field generating section 11 as shown in the third diagram.
a, 11 a, narrow part 1 that connects this magnetic field generating part together
1 b, 11 b, connecting leg 11 C, 11C1 positioning hole 11 d, 11 e, bearing mounting hole 11 f
, l1g.

A bearing 16 for pivotally supporting the second wheel 3 shown in the second diagram is installed in the bearing mounting hole 11f, and a bearing 16 for pivotally supporting the second wheel 4 and the minute wheel 6 shown in the second diagram is installed in the bearing mounting hole 11g. A bearing 17 is attached to the stator plate 11 to serve as the middle plate of the timepiece.

The coil core plate 12 is connected to the coil bobbin 13 as shown in the fourth figure.
The coil core 12a to which the stator plate 11 is attached, the connecting legs 12b, 1 facing the connecting legs 11C, IIC of the stator plate 11,
2b and positioning holes 12C, 12C.

On the other hand, as shown in FIGS. 1 and 2, the base plate 2 includes holding columns 18 and 19 that keep the coil core plate 12 at a predetermined height, and magnetic field generating parts 11a and 11a of the stator plate 11 at a predetermined height. Holding columns 20, 21, and 22 are integrally protruding from each other.

Further, the holding column 18 is integrally provided with a positioning protrusion 18 a that positions the coil core plate in the surface direction even if it engages with the positioning hole 12 C of the coil core plate 12 . The holding column 20° 21 has a hole 11d for positioning the stator plate 11.

Positioning protrusions 20a and 21a that engage with the stator plate 11e and position the stator plate in the surface direction are integrally provided.

The upper plate 1 also has pipe portions 25° 26 (the pipe portion 26 is not shown, but substantially (having the same structure as the pipe portion 25) are integrally provided.

In the final assembled state shown in the second figure, the stator plate 11 and the coil core plate 12 are connected only by pressure contact between the connecting legs 11C and 12b by the holding columns 18, 19 and the pressing columns 23.

The pressing column 23 is located depending on the middle part of the holding column 18.19,
In addition, the lengths of the connecting legs 11C and 12b are designed to curve slightly downward, thereby bringing the connecting legs 11C and 12b into surface contact with sufficient pressure.

In this embodiment, the base plates 1 and 2 also serve as capsules for housing and protecting each component.

As described above, according to the present invention, the connection between the stator plate and the coil core plate is achieved by using the holding columns and the pressing columns protruding from the two base plates without using means such as screw connection, caulking connection, or spot welding. As a result, the magnetic efficiency is not reduced due to the effects of screw connection, caulking connection, or spot welding, since the connection is made pressure-welded for the first time in the final assembled state.

Therefore, sufficient torque can be obtained with low current consumption, making it ideal as a small motor for watches, and particularly effective for motors with an integral stator structure.

Furthermore, the practical effects are enormous, such as reducing the number of assembly steps and making assembly easier.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which Fig. 1 is a plan view with the top plate removed, and Fig. 2 is a plan view of Fig. 1 II.
3 is a plan view of the stator plate, and FIG. 4 is a plan view of the coil core plate. 1.2...Support plate (base plate), 10...
Rotor, 11... Stator plate, 11 a...
...Magnetic field generation part, 11 b...Narrow width part, 11
C...Connection leg, 12...Coil core plate, 12a...Coil core, 12b...
... Connecting leg, 13 ... Coil bobbin, 1
4... Drive coil, 18.19... Holding column, 13... Pressing column.

Claims (4)

[Scope of utility model registration request] (1) A small timepiece motor for driving a timepiece wheel train disposed between two supporting plates is composed of a rotor, a stator plate, a coil core plate, and a drive coil, the stator plate and the coil core plate. are arranged parallel to each other between the two support plates and have a vertically overlapping portion, and at least one of the stator plate and the coil core plate is disposed on one of the support plates. Two holding columns protrude from the other of the two supporting plates, and the other of the stator plate and the coil core plate is located between the two holding columns and facing the vertically overlapping portion. A support structure for a small motor for a watch, comprising: a protruding pressing column that presses the motor on one side thereof. (2) The support structure for a small motor for a timepiece according to claim 1, wherein the stator plate has a magnetic field generating portion that is integrally connected via a narrow portion. (3) The support structure for a small motor for a timepiece according to claim 1 or 2, wherein the stator plate supports at least one of the timepiece wheel trains. (4) The support structure for a small motor for a timepiece according to claim 1, wherein the two support plates constitute a capsule of the timepiece wheel train.