JPH021831Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field to which the invention pertains] This invention is a method for preventing rotation of a slip ring in a current collecting ring device provided on the rotor side for supplying current to the rotor winding of a rotating electrical machine via an electric brush. Regarding structure.

[Prior art and its problems]

This type of current collecting ring device usually has the structure shown in FIG. That is, a cylindrical slip ring boss 2 is fitted onto the rotating shaft 1, and an annular plate-shaped slip ring 4 is attached to the outer periphery of the slip ring boss 2 via an insulator 3.
In this case, the slip ring boss 2 is prevented from rotating by a method such as inserting a key (not shown) between it and the rotating shaft 1, but the slip ring 4 is prevented from rotating by installing an insulator 3 on the inner peripheral surface of the slip ring. Since it is necessary to provide the slip ring 4 over the entire circumference, this has been done by shrink-fitting the slip ring 4. However, according to this method, if the ring rigidity of the slip ring boss 2 is weak, the shrink-fitting allowance must be adjusted or the required surface pressure cannot be obtained, so that the anti-rotation effect is not sufficient.

[Purpose of invention]

The purpose of this invention is to eliminate the above-mentioned drawbacks and provide a structure in which rotation between the slip ring and the slip ring boss can be reliably prevented even when the ring rigidity of the slip ring boss is weak.

[Key points of the idea]

In order to achieve the above-mentioned objective, this invention discontinued the conventional shrink-fitting method and instead drove a rotation-preventing pin between the slip-ring and the slip-ring boss to prevent the slip-ring from rotating.

[Example of idea]

Figure 1 shows an embodiment of this invention.
Point P in the figure is shown in detail in FIG.
Slip ring boss 12 fitted to rotating shaft 11
As shown in the figure, a space is maintained between the inner peripheral side of the portion where the slip ring 14 is fitted and the rotating shaft 11. This is for insulating the rotation prevention pin 16, which will be described later. The slip ring 14 is fitted onto the outer periphery of the slip ring boss 12 having such a shape via the insulator 13. As a structure for preventing rotation of the slip ring 14, an insulating bush 15 is embedded in the slip ring boss 12, and this insulating bush 1
5 and an insulator 13, and a locking pin 16 is driven into the slip ring 14. This pin 16 ensures that the slip ring 14 and the slip ring boss 12 are prevented from rotating even if there is no shrink-fitting pressure.

[Effect of idea]

According to this invention, even if there is no shrink-fitting pressure between the slip ring and the slip ring boss, rotation can be prevented by the rotation prevention pin driven into the slip ring, so there is no problem even if the rigidity of the slip ring boss is weak. That is, the thickness of the slip ring boss can be made thinner, and the weight of the current collector ring device can be reduced.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view of a current collector ring device that is an embodiment of this invention, Fig. 2 is an enlarged view of the point viewed from arrow P in Fig. 1, and Fig. 3 is a longitudinal cross-sectional view of a current collector ring device with a conventional structure. It is a front view. 11...Rotating shaft, 12...Slip spring boss, 13...Insulator, 14...Slip ring,
15... Insulating bushing, 16... Pin for rotation prevention.

Claims (1)

[Scope of utility model registration request] A current collector ring device in which an annular plate-shaped slip ring is attached to the outer periphery of a cylindrical slip ring boss fitted into a rotating shaft of a rotating electric machine via an insulator, the slip ring being attached to the slip ring boss. A current collector ring comprising: an insulating bushing embedded in the slip ring boss in a radial direction for fixation; and a pin penetrating the insulating bushing and the insulator and driven into the slip ring. Device.