JPH0137219Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a seal retention device for a rotating assembly.

A conventional seal retaining device of this type is configured as shown in Fig. 1, in which an inner rotating body a is supported at two locations in the axial direction on an outer hub d via roller bearings b and c. Insert a sleeve h as a seal holding member between them, attach a retainer e to the end of the inner rotating body a with a bolt f, and hold the inner race of the roller bearing c on the front side with this retainer e, and then press the roller bearings b and c. , to prevent the sleeve h from coming off.

However, in the conventional seal holding device described above, when the seal g held by the sleeve h wears out and needs to be replaced, first remove the bolt f and remove the retainer e, and then remove the roller bearing c on the front side. It was necessary to remove both the inner race and the outer race before pulling out the sleeve h, resulting in poor maintainability.

In addition, there are many parts that require precision, which increases costs. Furthermore, since the sleeve was simply inserted between both bearings, it was difficult to achieve precision with respect to the outer circumferential surface of the inner rotating body a and the inner circumferential surface of the hub d, and there was a problem with the precision of the rotating cylinder of the sleeve.

The present invention was developed in view of the above circumstances, and its purpose is to allow the sleeve to be taken out regardless of the roller bearing on the front side simply by removing the bolts that secure the sleeve to the inner rotating body. This improves maintainability during seal replacement work, eliminates the need for a retainer, reduces the number of parts that require precision, and reduces costs.Furthermore, the front side of the sleeve that holds the seal Since it is supported concentrically with the inner rotating body by a roller bearing, the axis of the sleeve is well aligned with the axis of the inner rotating body, improving the rotational cylindrical accuracy of the sleeve and extending the life of the seal. It is an object of the present invention to provide a seal retaining device for a rotating assembly that can perform the following functions.

Hereinafter, the present invention will be explained with reference to FIGS. 2 and 3.

In the drawing, 1 is an inner rotating body, 2 is a fixed member which is an outer hub, and the inner rotating body 1 is supported by one bearing 3 by the fixed member 2, and there is a gap between the inner rotating body 1 and the fixed member 2. A sleeve insertion portion 4 is configured with the front side open.

In the drawing, 5 is a sleeve, and a bearing part 6 is formed at the front end of the sleeve 5 in the insertion direction.
A seal mounting portion 7 is formed on the outer peripheral surface of the sleeve 5, and an O-ring mounting portion 8 is formed on the inner peripheral surface.
A ring 10 is attached.

Then, the sleeve 5 is inserted into the sleeve insertion portion 4, and the bearing portion 6 of the sleeve 5 is fixed to the end of the inner rotating body 1 with a bolt 11, so that the sleeve 5 is assembled. The fixed member 2 is held by the bearing portion 6 of the sleeve 5 via the roller bearing 12 on the front side.

Since the roller bearing 12 is held by the bearing portion 6 of the sleeve 5, the rotational cylindrical accuracy of the seal surface A is improved and the wear of the seal 9 itself is reduced.

Furthermore, by removing the bolt 11, the inner race 12a of the roller bearing 12 press-fitted into the bearing part 6 of the sleeve 5 together with the sleeve 5 is removed, as shown in FIG. Leave 12b.
In this way, the sleeve 5 is removed without pulling out the press-fit surfaces of the inner race 12a and outer race 12b of the roller bearing 12.

As described in detail above, the present invention involves holding the inner rotating body on the fixed member side with bearings at two locations in the axial direction, and inserting a sleeve between both bearings that holds a seal to seal this area. In this rotary assembly seal holding device, a bearing portion 6 is provided at the front end in the insertion direction of the sleeve 5 that holds the seal, and a roller bearing 12 located on the front side of the two bearings is attached to this bearing portion. Fit and hold the inner race, and attach the bearing part 6 to the bolt 11.
Since the sleeve 5 is fixed to the inner rotating body 1, by simply removing the bolt 11 that fixes the sleeve 5 to the inner rotating body 1, the sleeve can be removed regardless of the roller bearing 12 on the front side, making it easy to replace the seal. It is possible to improve the maintainability during maintenance, and since the retainer is no longer necessary, the number of parts that require precision is reduced, and costs can be reduced. Furthermore, the front side of the sleeve that holds the seal is supported concentrically with the inner rotating body by a roller bearing, so that the axis of the sleeve is well aligned with the axis of the inner rotating body, and the rotational cylindrical accuracy of the sleeve is improved. get better,
The life of the seal can be extended.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of a conventional seal retaining device of a rotating assembly, and FIG. 2 is a longitudinal sectional view of an embodiment of the present invention.
FIG. 3 is an exploded view of the same. 1 is an inner rotating body, 2 is a fixing member, 5 is a sleeve, 6 is a bearing part, 11 is a bolt, and 12 is a roller bearing.

Claims (1)

[Scope of utility model registration request] In a seal holding device for a rotating assembly, the inner rotating body is held on the fixed member side by bearings at two locations in the axial direction, and a sleeve holding a seal for sealing this portion is inserted between both bearings. A bearing part 6 is provided at the front end in the insertion direction of the sleeve 5 that holds the seal, and the inner race of the roller bearing 12 located on the front side of the two bearings is fitted and held in the bearing part 6. A seal holding device for a rotating assembly, characterized in that a portion 6 is fixed to an inner rotating body with a bolt 11.