JPS631577Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a shaft sealing device for a rotating electrical machine for a speed reducer.

In a conventional shaft sealing device for a rotary electric machine for a speed reducer, for example, as shown in the main part cutaway front view of FIG. The inner ring of the bearing 3 is fitted to the end of the shaft 2, and an oil groove recess 5 is provided on the outer periphery of the tip 4 of the bearing bracket 1, and a depressurizing oil groove 6 is provided on the inner periphery and an oil drain hole 7 is provided on the lower part. Set it up by wearing it. In addition, at the stepped portion at the end of the rotating shaft 2, an umbrella-shaped oil drain cap 8 is provided with a gap H between the four surfaces of the protruding end of the bearing bracket 1, and the inside of the umbrella-shaped oil drain cap 8 is directed toward the bearing bracket 1, and a disc-shaped oil cap is provided on the back surface of the umbrella-shaped oil drain cap 8. The cutting plates 9 are aligned and inserted, and the preload spring 10 is further inserted, the pinion gear 11 is fitted through a key groove (not shown) at the end of the rotating shaft 2, and the tightening nut 12 is tightened and fixed to the end of the rotating shaft 2. , preload spring 1
0, the oil drain cap 8 and oil drain plate 9 are pressed in the axial direction. In the shaft sealing device on the reducer side of the rotary electric machine for the reducer described above, the gear of the driven shaft (not shown) that meshes with the pinion gear 11 attached to the end of the rotating shaft 2 is provided with the lower part immersed in lubricating oil in the casing. Since the lubricating oil lubricates the pinion gear 11, the lubricating oil is scattered into the casing due to the rotation of the gear of the driven shaft (not shown) that meshes with the pinion gear 11 as the rotary electric machine for the reduction gear rotates. In particular, when the pinion gear 11 is a helical gear, due to the helical angle 13 of the teeth, lubricating oil is scattered toward the circular oil cutting plate 9 as shown by arrow F, and the lubricating oil jumps over the circular oil cutting plate 9. The oil is further scattered on the outer periphery by the umbrella-shaped oil drain cap 8, and the lubricating oil scattered on the side surface of the bearing bracket 1 flows into the oil groove 5 on the outer periphery of the tip 4 of the bearing bracket 1 and drips to the lower part. In addition, if a large amount of lubricating oil splashes and flows into the oil groove 5 on the outer periphery, the lubricating oil will flow down into the gap H between the 4 surfaces of the tip end of the bearing bracket 1 and the umbrella-shaped oil drain cap 8, causing the The lubricating oil that flows into the gap HB of the rotating shaft 2 penetration part of the tip 4 and further penetrates into the pressure reducing oil groove 6 on the inner circumference is discharged to the outside from the lower oil drain hole 7, but inside the reducer casing (not shown). A combination of gear groups for deceleration, and a pinion gear 1 at the 2nd end of the rotating shaft
1 is a helical gear, and as the torsion angle 13 of the teeth increases, the lubricating oil scatters over the disc-shaped oil cutting plate 9 and a large amount of lubricating oil flows toward the bearing bracket 1 side. Therefore, there is a drawback that a large amount of lubricating oil overflows the recess 5 of the oil groove on the outer periphery of the tip of the bearing bracket and enters into the gap HB between the tip 4 of the bearing bracket 1 and the rotating shaft 2 penetrating portion. In addition, if the installation position of the rotating electrical machine for the reducer is at an inclination angle of 15 degrees to 20 degrees, for example,
When the reducer side is installed obliquely upward, the rotating shaft 2 of the tip 4 of the bearing bracket 1 of the rotating electrical machine for the reducer
Since the penetrating part is diagonally downward, if the above-mentioned lubricating oil overflows the oil groove 5 and flows into the gap HB of the rotary shaft 2 penetrating part, the lubricating oil provided on the inner periphery of the bearing bracket tip 4 may The decompression oil sometimes overflows through the pressure reducing oil groove 6, passes through the bearing 3, and enters the rotary electric machine for the reduction gear (not shown), resulting in deterioration of the insulation of the windings in the equipment and deterioration of the characteristics.

As a measure to improve the conventional shaft sealing device on the reducer side described above, for example, as shown in the cutaway front view of the main part of the shaft sealing device in FIG. There is also a shaft sealing device that prevents lubricating oil from entering through contact pressure with the oil seal 14, but since the lip 15 of the oil seal 14 and the rotating shaft 2 are constantly in contact with each other, inspection and repair are necessary, and if the contact part wears out. , a gap is created, and through the gap HB between the protruding end 4 of the bearing bracket 1 and the rotating shaft 2 penetration part, the lubricating oil scattered inside the rotating electric machine for the reducer enters, and the function as a shaft sealing device is lost. There were disadvantages such as reliability problems and other problems.

The present invention was developed in view of the above-mentioned circumstances, and provides a shaft sealing device for a rotating electrical machine for a reduction gear, which prevents lubricating oil from leaking into the rotating electrical machine for a reduction gear by providing a flange on the bearing bracket. aim at something.

An embodiment of the present invention will be described below with reference to the drawings. FIG. 3 is a cutaway front view of essential parts showing the shaft sealing device for a rotary electric machine for a speed reducer according to the present invention. However, the same parts as those in FIG. The shaft sealing device for a rotating electric machine for a speed reducer according to the present invention is similar to the conventional shaft sealing device shown in FIG. A gap H is provided between a disc-shaped oil cutting plate 9 and an umbrella-shaped oil cutting cap 8,
Furthermore, a preload spring 10 is inserted, and a pinion gear 11 is tightened and fixed to the end of the rotating shaft 2 with a tightening nut 12. Further, an oil groove recess 5 is provided on the outer periphery of the bearing bracket tip 4, a depressurizing oil groove 6 is provided on the inner periphery, and an oil drain hole 7 is bored in the lower part. Thus, an annular flange is inserted from the bearing bracket 1 to cover the end of the umbrella 16 of the umbrella-shaped oil drain cap 8, which is installed on the shaft end of the rotating shaft 2 and widens towards the equipment side, and the recess 5 of the oil groove. The section 17 is extended and provided. Note that the annular flange 17 of this bearing bracket 1
Alternatively, the annular flange 17 may be separately manufactured as a component and attached to the end surface of the bearing bracket 1 with tightening bolts or the like.

In the structure according to the embodiment of the present invention shown in FIG. 3 described above, the operation and effect will be explained next. The lubricating oil adhered to the pinion gear 11 fixed to the end of the rotating shaft 2 and the gear group in the reducer casing (not shown) is scattered as shown by arrow F, and the lubricating oil jumps over the disc-shaped oil cutting plate 9. , and a part of the lubricating oil scattered toward the bearing bracket side flows out from the outer periphery of the annular flange 17 provided on the bearing bracket 1 to the lower part. Furthermore, the lubricating oil that has fallen from the tip of the annular collar 17 of the bearing bracket to the umbrella end 16 of the umbrella-shaped oil drain cap 8 is scattered in the radial direction by the centrifugal force caused by the rotation of the umbrella-shaped oil drain cap 8. Therefore, the lubricating oil that has been scattered into the recess 5 of the oil groove provided on the outer periphery of the tip 4 of the bearing bracket, as in the conventional case, overflows and flows between the tip 4 surface and the umbrella-shaped oil drain cap 8. clearance H and clearance with the rotating shaft 2 penetration part
Prevents a large amount of lubricating oil from flowing into the HB, and also prevents oil leakage from entering the rotating electrical machine for the reduction gear.

As described above, according to the present invention, the installation position of the rotating electrical machine for the reducer is installed on a slope, and even if the two ends of the rotating shaft of the rotating electrical machine are tilted in either the up or down direction, the lubricating oil does not enter into the rotating electrical machine. Since the shaft sealing device according to the present invention has a non-contact structure and has no worn parts, there is no need for inspection and repair, and therefore, there is an effect that maintenance work can be omitted.

[Brief explanation of the drawing]

Fig. 1 is a cutaway front view of main parts of a conventional shaft sealing device for a rotating electric machine for a speed reducer, Fig. 2 is a cutaway front view of main parts of a shaft sealing device showing another conventional example, and Fig. 3 is a cutaway front view of main parts of a shaft sealing device according to the present invention. FIG. 2 is a front view with a main part cut away of a shaft sealing device for a rotating electrical machine for a speed reducer, showing one embodiment of the present invention. 1... Bearing bracket, 2... Rotating shaft, 4...
Bearing bracket tip, 5... Oil groove recess, 8...
Umbrella-shaped oil draining cap, 9...Circular oil draining plate, 10
...Preload spring, 11...Pinion gear, 16...
... Umbrella end of umbrella-shaped oil cutting plate, 17... Annular flange,
H, HB...Gap, F...Lubricating oil scattering flow direction.

Claims (1)

[Scope of utility model registration request] In a rotary electric machine bearing bracket that seals the shaft penetrating portion of the rotating shaft on the reducer side, an oil groove recess is provided on the outer periphery of the tip of the bearing bracket, and an oil groove is provided in the stepped portion of the rotating shaft with a gap between the tip and the tip of the bearing bracket. An umbrella-shaped oil-cutting cap is installed to widen toward the equipment side, and a disc-shaped oil-cutting plate is fitted to the back of the cap and inserted.
Furthermore, a pinion gear is inserted and installed at the end of the rotating shaft,
The concave portion of the oil groove provided on the umbrella end of the umbrella-shaped oil drain cap and the outer periphery of the bearing bracket tip,
A shaft sealing device for a rotating electric machine for a reducer, characterized in that a bearing bracket is covered with an annular flange.