JPS5836217Y2 - rotor - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a rotor having a permanent magnet used in, for example, a motor.

Conventionally, in this type of rotor, sintered magnets, for example, are often used as permanent magnets, which are extremely hard and difficult to process.In particular, it is difficult to polish the inner diameter of the hole that the rotor shaft passes through, making it difficult to achieve dimensional accuracy of the hole. It is.

For this reason, when the magnet is press-fitted onto the shaft, there are drawbacks such as ease of breakage, eccentricity, and difficulty and complexity of processing such as the need for bonding with an adhesive.

Therefore, in the present invention, the center hole of the magnet is loosely fitted to the rotor shaft, and an elastic claw provided on the seat is inserted into the gap between the small diameter shaft provided on the shaft and the center hole of the magnet. To provide a rotor whose center can be aligned, magnets are held on a rotor shaft so that they cannot fall off and rotate, and which is simple in structure, easy to assemble and remove, and has good workability.

The gist of the present invention is to provide a synthetic resin rotor shaft having a flange and a small-diameter shaft formed at the bottom of the rotor shaft; A permanent magnet faces the shaft and has a center hole through which the rotor shaft passes, and a permanent magnet enters a gap between the small diameter shaft and the inner surface of the center hole, engages with the small diameter shaft, and further abuts the lower part of the permanent magnet. a plurality of elastic claws having inclined surfaces;
A seat is provided on the opposite side of the elastic claw, and a seat is integrally formed with a fall-off prevention claw that engages with the outer periphery of the small diameter shaft.

To explain one embodiment of the present invention, as shown in the first diagram, a rotor shaft 1 made of synthetic resin has a rotor pinion 2 and a collar portion 3 integrally formed, and the lower half of the rotor shaft. is a small diameter shaft 4 with a reduced diameter.

The permanent magnet 5 has a donut shape, and the center hole 5a is loosely fitted into the rotor shaft 1.

The upper surface of the permanent magnet 5 is in contact with the lower surface of the part 3, and the center hole 5a
has a sufficient thickness so that the lower inner surface thereof faces the upper end of the small diameter shaft 4.

The seat 6 is made of metal, and has elastic claws 7, 7 that bend upward around the center hole 6a and have an inclined surface, and drop-off prevention claws 8, 8 that bend downward around the center hole 6a. It is.

The elastic claws 7, 7 are connected to the outer periphery of the upper end of the small diameter shaft 4 and the center hole 5 of the magnet.
a, the tip of the elastic claw engages with the shaft 4, and the inclined surface abuts the lower part of the magnet, for example, the lower end opening edge of the center hole 5a, thereby aligning the center of the magnet 5, that is, the magnet 5 The center of the rotor shaft 1 can be aligned with the axis of the rotor shaft 1.

The falling-off prevention claws 8, 8 are bent on the opposite side from the elastic claws 7, 7, and engage with the outer periphery of the small diameter shaft 4 to prevent the seat 6 from falling off from the rotor shaft.

Therefore, in order to assemble the rotor of the present invention, first, the rotor shaft 1 is passed through the center hole 5a of the permanent magnet 5 from the small diameter shaft 4 side, and the magnet is brought into contact with the lower surface of the flange portion 3.

The lower inner surface of the center hole 5a of the magnet faces the outer peripheral surface of the upper end of the small diameter shaft 4.

When the seat 6 is pushed in from the lower part of the rotor shaft, the tips of the elastic claws 7, 7 are strongly held against the small diameter shaft 4, and the inclined outer surface thereof comes into contact with the lower end opening edge of the center hole 5a, and at the same time, the falling-off prevention claws 8, 8 is strongly secured to the outer periphery of the shaft 4.

In the present invention having the above configuration, the permanent magnet can be aligned to the true center with respect to the shaft by the small diameter shaft of the shaft and the elastic claw provided on the seat, and furthermore, this permanent magnet can be rotated with respect to the shaft. It can be held in such a way that it cannot fall off or fall off, and it has a simple structure, can be assembled with one touch, and can be easily removed, improving work efficiency.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, with FIG. 1 being a longitudinal sectional view and FIG. 2 being an enlarged perspective view of the seat. 1...Rotor shaft, 3...Brim part, 4...
...Small diameter shaft, 5...Permanent magnet, 5a...
... Center hole, 6 ... Seat, 7 ... Elastic claw, 8 ... Fall-off prevention claw.

Claims (1)

[Scope of Claim for Utility Model Registration] A synthetic resin rotor shaft that has a flange and a small diameter shaft formed at the bottom thereof, and the upper surface of this rotor shaft touches the lower surface of the flange, and the lower inner surface of the center hole is connected to the small diameter shaft. A permanent magnet facing the center hole through which the rotor shaft passes, and an inclined surface that enters the gap between the small diameter shaft and the inner surface of the center hole, engages the small diameter shaft, and abuts the lower part of the permanent magnet. A rotor comprising: a plurality of elastic pawls; and a seat integrally formed with a fall-off prevention pawl that is bent on the opposite side of the elastic pawls and engaged with the outer periphery of the small diameter shaft.