JPH0226203Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a stator insulating device for a commutator motor having an internal cylindrical insulation structure.

FIG. 2 is a cross-sectional view of a conventional commutator motor having an internal cylinder type double insulation structure. In the figure, 1 is the outer frame, 2
3 is an inner cover, and 3 is a stator, which is arranged around the outer periphery of the rotor 4 with a gap therebetween. 5 is an insulating inner cylinder,
It is screwed onto the inner end surface 12 of the outer frame 1 through a plurality of bolts 6 which are fitted into the insulating tube 9 and are insulated to the stator 3 through the insulating holder 8 and the insulating tube 9. Further, the end face side of the stator 3 opposite to the inner end face portion 12 is also insulated via the inner step portion 13 of the insulating inner cylinder 5. 7 is a screw that fixes the inner cover 2 to the outer frame 1.

In the above structure, the stator 3 is fixed using the insulating tube 9 and the insulating holder 8 in order to insulate the bolt 6 that is electrically connected to the outer frame 1 from the stator 3, so the number of parts is reduced. The structure was often complicated, making it difficult to assemble and requiring a large number of man-hours.

The present invention was developed in view of the above-mentioned situation, and aims to provide a stator insulating device for a commutator motor that can reduce the number of parts and the number of work steps.

The stator insulating device for a commutator motor of the present invention includes a stator disposed on the outer periphery of the rotor with a gap therebetween, and a plurality of bolts passing through the stator in the axial direction. The stator is fixed to an outer frame with an insulating inner cylinder enclosing one end face, and an inner cover is fixed to the outer frame end face. A protrusion that is fitted into the axial hole and fixed in the circumferential direction is provided protruding from the end face, the inner stepped part of one end is in contact with the inner end face of the outer frame, and the other end is in contact with the inner end face of the inner cover. the insulating inner cylinder that is in contact with and fixed by clamping;
The bolt is screwed onto the end face of the insulating inner cylinder to fix the stator to the insulating inner cylinder. That is, the present invention has a structure in which the stator is completely insulated and fixed to the outer frame by the insulating inner cylinder, and an engagement part with axial unevenness is provided at the end surface joint between the insulating inner cylinder and the outer frame. The insulating inner cylinder is fixed in the circumferential direction, and is clamped between the outer frame and the inner cover in the axial direction, and the stator is fixed to the insulating inner cylinder via bolts.

Hereinafter, the stator insulating device for a commutator motor of the present invention will be explained with reference to FIG. 1 using an embodiment, and the same parts as the conventional one are denoted by the same reference numerals, and the explanation of the structure of the same parts is omitted. In the figure, 10 is a protrusion axially protruding from the end face of the insulating inner cylinder 5 toward the inner end face 12 formed on the outer frame 1, and 11 is a protrusion 10 extending axially from the inner end face 12.
It is a hole formed so that it can be inserted. Further, the inner step 13 of the insulating inner cylinder 5 is formed thick in the axial direction, and has a screw hole into which the bolt 6 can be screwed. The stator 3 is fixed to the insulating inner cylinder 5 via a plurality of bolts 6 so that the end surface thereof abuts against the inner step 13 of the insulating inner cylinder 5. The insulating inner cylinder 5 is prevented from rotating in the circumferential direction by fitting the protrusion 10 into the hole 11, and the inner end face 12 of the outer frame 1 and the inner cover 2 are prevented from rotating in the circumferential direction.
The inner cover 2 is fixed to the outer frame 1 via screws 7, and the insulating inner cylinder 5 is therefore fixed to the outer frame 1.

In this way, the stator insulating device for the commutator motor of this embodiment fixes the insulating inner cylinder to the outer frame via the inner cover and screws, and fixes the stator to the insulating inner cylinder via bolts. Since it is formed to be insulated and fixed to the outer frame, parts of the insulating holder and insulating tube of the conventional structure are unnecessary, and new parts to replace them are also unnecessary, reducing the number of parts and simplifying the structure, making assembly easier. The number of man-hours required can be reduced.

As described above, the stator insulating device for a commutator motor of the present invention has the effect of reducing the number of parts and the number of work steps.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional side view of an embodiment of the stator insulating device for a commutator motor of the present invention, and FIG. 2 is a longitudinal sectional side view of a conventional internal cylindrical double insulation structure of a commutator motor. 1...Outer frame, 2...Inner cover, 3...Stator, 4...Rotor, 5...Insulating inner cylinder, 6...Bolt, 7...Screw, 10...Protrusion, 11...Hole ,1
2... Inner end surface part, 13... Inner step part.

Claims (1)

[Scope of utility model registration request] A stator is arranged around the outer periphery of the rotor with a gap therebetween, and the stator is fixed by means of bolts that fix the stator through an insulating inner cylinder that encloses the outer periphery and one end surface of the stator. An inner cover is provided with an outer frame and an inner cover fixed to the end face of the outer frame, and a protrusion is fitted into an axial hole formed in the inner end face of the outer frame and fixed in the circumferential direction. the insulating inner cylinder, which is provided protruding from the end face, has an inner stepped part at one end abutting the inner end face of the outer frame, and the other end is abutting against the inner end face of the inner cover and is clamped; A stator insulating device for a commutator motor, characterized in that the above-mentioned bolt is screwed into the inner stage part of the inner cylinder so as not to penetrate the insulating inner cylinder and fixes the stator to the insulating inner cylinder. .