JPS634857Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to, for example, an improvement of a shaft sealing device for a rotating electric machine.

A conventional shaft sealing device for a rotating electrical machine will be explained with reference to FIG. Reference numeral 1 denotes a support consisting of a load-side bracket connected to the end of a frame (not shown) that surrounds and supports a fixed iron core (not shown), and 2 denotes this support 1.
2a is an annular protrusion formed on the outer end side of the housing 2; 2b is an annular recess formed by the small diameter portion 2c and the inner peripheral surface of the annular protrusion 2a; 2d is described later 3 is an oil seal fitted to the inner peripheral surface of the housing 2, 4 is a rotor core (not shown)
The rotor shaft is fitted into the housing 2 and is rotatably supported by a ball bearing 5, with one end protruding from the outer end surface of the housing 2. It is arranged to face the hollow part of the housing 2 with a small gap a in between, and to come into sliding contact with the lip part of the oil seal 3. 6 is a bolt that connects the housing 2 to the outer end surface of the support 1; 7 is a rotating member fitted to the rotor shaft 4; 7a is an annular protrusion formed on the outer periphery of the rotating member 7; The surface is the annular protrusion 2a.
The protruding end surface faces the bottom surface of the annular recess 2b with a micro gap c in between, and the inner peripheral surface faces the inner circumferential surface of the annular recess 2b with a micro gap d in between. They are facing each other through.

In a machine configured in this way, dust or rainwater tends to enter the machine body when the machine is operating or stopped, but because the minute gaps b, c, and d are formed in a labyrinth shape, these minute gaps b, c,
Part d prevents dust or rainwater from entering. If dust or rainwater enters through these minute gaps b, c, and d, the ball bearing will be damaged at the sliding contact area between the lip of the oil seal 3 and the rotor shaft 4, similar to the simple shaft seal device. Infiltration to the 5th side is prevented. That is, the double shaft sealing structure of minute gaps b, c, and d and the sliding contact portion of the oil seal 3 and rotor shaft 4 completely prevents dust or rainwater from entering the body. However, in order to prevent dust and rainwater from entering, the annular protrusion 2a and the fitting hole 2d formed on the housing 2 are
Not only do they have different inner peripheral dimensions, but they are also machined from different directions during machining, which makes machining troublesome.Moreover, it is necessary to fix the housing 2 with bolts 6, making the configuration complicated. It had

This invention was made to eliminate the above-mentioned drawbacks, and includes a first fitting hole for fitting the bearing into the support, and a second fitting hole having a diameter smaller than that of the first fitting hole. A hole is provided, an oil seal is fitted into this second fitting hole, and a bush having a cylindrical first protrusion forming a gap with the second fitting hole is fitted, and the bush is rotated. By arranging a rotating member having a cylindrical second protrusion with a small gap between the second fitting hole and the bush on the shaft, workability can be improved and the structure can be changed. It is an object of the present invention to provide a shaft sealing device that can be simplified.

Embodiments of the present invention will be described below with reference to FIG.

In the figure, reference numeral 1 denotes a support body consisting of a load-side bracket connected to one end of a frame body (not shown) that surrounds and supports a stator core (not shown), and a first support body in which a ball bearing 5 is fitted. A fitting hole 1a and a second fitting hole 1b having a smaller diameter than the first fitting hole 1a are formed. Reference numeral 3 denotes an oil seal disposed near the ball bearing 5 in the second fitting hole 1b, and reference numeral 8 abuts the oil seal 3 on the side opposite to the ball bearing 5, and fits into the second fitting hole 1b. The bush is mounted on the rotor shaft 4 and faces the outer periphery of the rotor shaft 4 through a small gap, and a second fitting hole 1b is provided on the side opposite to the oil seal 3.
an axial cylindrical protrusion 8a with a space formed between the
is formed. 7 is a rotating member fitted to the rotor shaft 4, 7a is an annular protrusion formed on the outer periphery of this rotating member 7, and the outer periphery is connected to the second fitting hole 1b.
The protruding end surface faces the stepped end surface 8b of the bush 8 with a minute gap c, and the inner circumferential surface faces the outer circumferential surface of the cylindrical protrusion 8a with a minute gap d. are facing each other through.

In the structure as described above, if dust or rainwater tries to enter the body of the machine, the small gaps b, c, and d prevent the ingress, and furthermore, the lip part of the oil seal 3 and the rotating This is doubly blocked by the sliding contact portion of the child shaft 4.

Here, during assembly, the oil seal 3 is inserted into the second fitting hole 1b of the support body 1, and the bush 8 is further inserted into the same fitting hole as the oil seal 3, that is, the second fitting hole 1b. Therefore, the cylindrical protrusion 7a of the rotating member 7 fitted to the rotor shaft 4 is arranged between the cylindrical protrusion 8a of the bush 8 and the second fitting hole 1b, and the minute gap b , c, and d form a labyrinth that blocks dust and rainwater.

As described above, this invention provides a first fitting hole for fitting the bearing in the support body, a second fitting hole having a smaller diameter than the first fitting hole, and a first fitting hole for fitting the bearing into the support. While fitting the oil seal into the fitting hole, the second
A bushing having a cylindrical first protrusion forming a gap is fitted into the fitting hole, and a small gap is formed between the second fitting hole and the bushing on the rotating shaft. Since a rotary member having a second cylindrical protrusion is disposed, the bushing can be placed in the same hole in which the oil seal is fitted. It can also be used as a shaft sealing function with an extremely simple structure, and is also easy to process, which is effective in improving processability.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a main part of a conventional device, and FIG. 2 is a sectional view of a main part of an embodiment of this invention. In the figure, 1 is a support, 1a is a first fitting hole, 1b is a second fitting hole, 3 is an oil seal, 4 is a rotor shaft, 5 is a ball bearing, 7 is a rotating member, and 7a is a cylinder. 8 is a bush, and 8a is a cylindrical projection. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Scope of utility model registration request] a support body having a first fitting hole into which the bearing is fitted and a second fitting hole having a diameter smaller than the diameter of the first fitting hole; a rotating shaft rotatably supported by the bearing; An oil seal that slides on the outer periphery of the rotating shaft and is fitted into the second fitting hole, one end of which abuts the end surface of the oil seal opposite to the bearing, and the other end of which is fitted with the second fitting hole. It has a cylindrical first protrusion that forms a predetermined gap with the inner periphery of the matching hole,
a bush disposed on the outside of the rotating shaft and fitted into the second fitting hole; A shaft seal for a rotating electric machine, which has a cylindrical second protrusion that faces the inner periphery of the mating hole and the outer periphery of the first protrusion through a small gap, and includes a rotating member fitted to the rotating shaft. Device.