JPH03177614A - Contra-rotating bearing device and assembling thereof - Google Patents

Abstract

PURPOSE:To mount a bearing device without space, by providing a plain bearing arranged on the outer peripheral surface of an innerside propella shaft, a roller bearing whose inner ring is built in the outer peripheral surface of this plain bearing, two outside propella shafts, sleeve fitting in the outer peripheral surface and so on. CONSTITUTION:On the inner peripheral surface of the inner ring 5 of a roller bearing, a plain bearing 4 is built in, and into this bearing 4, an inner side propella shaft 1 is inserted. Shafts 2 and 3 are made concentric with the shaft 1, and brought into contact with one side and another side of the roller bearing respectively, and the shafts 2 and 3 and the outer ring 6 between the shafts 2 and 3 are forced and fixed with sleeve joints, using two outside propella shafts 2 and 3 of the same outer diameter as that of the outer ring 6 of the roller bearing. The sleeve fitting is of a hydraulically operated type and is composed of an inner sleeve 8, outer sleeve 9, nut 11, and a hydraulic chamber 12 which contacts with each other at the taped surface. Between sleeves 8 and 9, oil film are formed to reduce the coefficient of friction. High pressured oil is supplied into the hydraulic chamber 12 for generating compresion stress in the sleeve 8, shafts 2 and 3.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention is characterized in that the inner propeller shaft and the outer propeller shaft are concentric,
This bearing device relates to a bearing device for counter-rotating shafts that rotate in opposite directions, and a method for assembling the same. It is installed at the joint with the

[Conventional technology]

A conventional bearing device of this type has a configuration as shown in FIG. 2, for example.

In FIG. 2, 21 is an inner propeller shaft, 22 is one outer propeller shaft, 23 is another outer propeller shaft, 24 is a flange of the one outer propeller shaft 22, and 25 is a flange of the other outer propeller shaft 23. , 26 is a counter-rotating belly bearing that supports the weight of the inner propeller shaft 21;
7 is an arrow indicating the rotation direction of the inner propeller shaft 21; 28
is an arrow indicating the direction of rotation of the outer propeller shaft 22,23.

That is, as shown in FIG. 2, in the conventional counter-rotating bearing device, when the counter-rotating bearing 26 that supports the weight of the inner propeller shaft 21 is installed between the outer propeller shafts 22 and 23, the outer propeller shaft 22.23 to flange 24.
25, and a corresponding belly bearing 26 was incorporated into the inner surface of one of the outer propeller shafts 22.

[Problems to be Solved by the Invention] However, in the above-mentioned conventional technology, a counter-rotating bearing is constructed in a narrow space between the inner surface of the outer propeller shaft 22, 23 and the outer surface of the inner propeller shaft 21, which causes slippage. Only compact bearings such as bearings can be installed.

However, when a sliding bearing is used as a counter-rotating bearing, there is a problem in that an oil film is formed and wear and seizure are likely to occur. Therefore, in order to incorporate a rolling bearing that does not cause any problems even when used as a counter-rotating bearing, it is necessary to widen the space between the outer surface of the outer propeller shaft 22, 23 and the outer surface of the inner propeller shaft 21, and the flange 24° 25 is also larger, which increases costs.Furthermore, if the outer ring of the rolling bearing and the outer propeller shaft are not connected so that there is no gap, there is a problem that cribs will occur and damage the rolling bearing.

The present invention aims to solve the above problems. That is, the present invention provides a counter-rotating bearing device that is less prone to wear and seizure, does not increase costs, can withstand long-term use, and is easy to assemble, and a method for assembling the bearing device. The purpose is to

[Means to solve the problem]

In order to achieve the above object, the counter-rotating bearing device of the present invention comprises: a sliding bearing provided on the outer peripheral surface of the inner propeller shaft; a rolling bearing in which an inner ring is incorporated in the outer peripheral surface of the sliding bearing; one outer propeller shaft having the same outer diameter as the outer ring of the rolling bearing and being concentric with the inner propeller shaft and in contact with one side of the rolling bearing; the other outer propeller shaft having the same outer diameter as the outer diameter, being concentric with the inner propeller shaft and in contact with the other side of the rolling bearing, and the two outer propeller shafts; The sleeve joint is press-fitted and fixed to the outer ring of the rolling bearing.

In addition, the method for assembling the counter-rotating bearing device of the present invention includes assembling a slip bearing on the inner circumferential surface of the inner ring of a rolling bearing, inserting an inner propeller shaft into this sliding bearing, and having the same outer diameter as the outer ring of the rolling bearing. Using two outer propeller shafts having an outer diameter of The two outer propeller shafts and the outer ring of the rolling bearing therebetween are press-fitted and fixed by a sleeve joint.

[Effect]

According to the present invention, a sliding bearing is incorporated into the inner ring of a rolling bearing, an inner propeller shaft is inserted into this sliding bearing, the outer diameter of the outer propeller shaft is made the same as the outer diameter of the outer ring of the rolling bearing, and the outer propeller The rolling bearing is inserted into the joint of the shaft, and the sleeve joint connects the outer propeller shaft and at the same time fixes the outer ring of the rolling bearing, so it can be installed without any gap between the outer ring of the rolling bearing and the outer propeller shaft. Further, the sleeve joint can be mounted without any gaps between the inner circumferential surface of the sleeve joint, the outer circumferential surface of the outer propeller shaft, and the outer circumferential surface of the outer ring of the rolling bearing. Therefore, there is no risk of fretting wear on the outer circumferential surface of the outer ring of the rolling bearing due to creep or the like, and assembly becomes extremely simple.

〔Example〕

FIG. 1 shows an embodiment of the counter-rotating bearing device of the present invention.

In FIG. 1, 1 is an inner propeller shaft, 2 is one outer propeller shaft, 3 is the other outer propeller shaft, 4 is a slide bearing provided on the outer peripheral surface of the inner propeller shaft l, and 5 is this slide bearing. 6 is the outer ring of the rolling bearing, 7 is the roller of the rolling bearing, 8 is the inner rib of the sleeve joint, 9 is the outer sleeve of the sleeve joint, 10 is the outer ring of the rolling bearing, and 10 is the outer ring of the rolling bearing. The tapered surfaces of the contact surfaces of the sleeves 8 and 9, 11 a nut, and 12 a hydraulic chamber.

The method for assembling this counter-rotating bearing device is to assemble a sliding bearing 4 on the inner peripheral surface of the inner ring 5 of the rolling bearing, insert the inner propeller shaft 1 into the sliding bearing 4, and then insert the inner propeller shaft 1 into the sliding bearing 4. Using two outer propeller shafts 2.3 having the same outer diameter as the outer diameter, one outer propeller shaft 2 and the other outer propeller shaft 3 are connected to the inner propeller shaft]
The two outer propeller shafts 2, 3 and the outer side 6 of the rolling bearing between them are brought into contact with one side and the other side of the rolling bearing so as to be concentric with, as will be described later,
Press-fit and fix with sleeve fitting.

That is, in this embodiment, the sleeve joint is hydraulic and is composed of an inner sleeve 8 and an outer sleeve 9 that are in contact with each other at a tapered surface 10, a nut 11 and a hydraulic chamber 12, and the outer sleeve By forming an oil film between the inner rib 9 and the inner rib 8 to reduce the coefficient of friction, and supplying high pressure oil to the hydraulic chamber 12,
The outer sleeve 9 is connected to the tapered surface 1 of the inner sleeve 8
0, generates compressive stress on the inch sleeve 8, the outer propeller shaft 2.3, and the outer ring 6 of the rolling bearing, and connects them.

By doing this, the outer ring 6 of the rolling bearing can be mounted without any gaps, and the outer ring 6 of the rolling bearing can be mounted without any gaps.
Since the inner circumferential surface of the inner sleeve 8 can also be attached without any gaps, there is no fear that the outer circumferential surface of the outer ring 6 will suffer fretting wear due to creep or the like, and assembly becomes extremely simple.

〔Effect of the invention〕

As explained above, according to the present invention, a sliding bearing is incorporated into the inner ring of a rolling bearing, an inner propeller shaft is inserted into this sliding bearing, and the outer diameter of the outer propeller shaft and the outer diameter of the outer ring of the rolling bearing are made equal to each other. The rolling bearing is inserted into the connecting part of the outer propeller shaft, and the sleeve joint connects the outer propeller shaft and the outer ring of the rolling bearing is also fixed at the same time, so it is installed without any gap between the outer ring of the rolling bearing and the outer propeller shaft. Furthermore, the sleeve joint can be mounted without any gaps between the inner surface of the sleeve joint, the outer circumferential surface of the outer propeller shaft, and the outer circumferential surface of the outer ring of the rolling bearing.

Therefore, fretting wear on the outer circumferential surface of the outer ring of the rolling bearing due to creep or the like can be avoided, and assembly is extremely simple, so costs can be reduced.

[Brief explanation of drawings]

FIG. 1 is a side sectional view showing an embodiment of the present invention, and FIG. 2 is a side sectional view showing an example of a conventional technique. DESCRIPTION OF SYMBOLS 1... Inner propeller shaft, 2... One outer propeller shaft, 3... Other outer propeller shaft, 4... Sliding bearing, 5... Inner ring, 6... Outer ring, 7...・Koro, 8・
...Inner sleeve, 9...Outer sleeve, 10
...Taper surface, 11...Natsuto, 12...Uratsu room.

Claims (1)

[Claims] 1. A sliding bearing provided on the outer peripheral surface of the inner propeller shaft, a rolling bearing having an inner ring built into the outer peripheral surface of the sliding bearing, and a rolling bearing having an outer diameter that is the same as the outer ring of the rolling bearing. one outer propeller shaft having an outer diameter and being concentric with the inner propeller shaft and in contact with one side of the rolling bearing; and an outer propeller shaft having an outer diameter that is the same as the outer diameter of the outer ring of the rolling bearing. press-fit and fix the other outer propeller shaft that is concentric with the inner propeller shaft and in contact with the other side of the rolling bearing, and the two outer propeller shafts and the outside of the rolling bearing between them. A counter-rotating bearing device, characterized in that it is equipped with a sleeve joint. 2. The counter-rotating bearing device according to claim 1, wherein the sleeve joint comprises an inner sleeve and an outer sleeve, and the contact surfaces of both sleeves are tapered surfaces. 3. A sliding bearing is incorporated into the inner peripheral surface of the inner ring of the rolling bearing, an inner propeller shaft is inserted into this sliding bearing, and two outer propeller shafts having the same outer diameter as the outer diameter of the outer ring of the rolling bearing are used. Then, the one outer propeller shaft and the other outer propeller shaft are brought into contact with one side and the other side of the rolling bearing, respectively, so as to be concentric with the inner propeller shaft, and the two outer propeller shafts and the A method for assembling a counter-rotating bearing device, characterized in that the outer ring of the rolling bearing is press-fitted and fixed with a sleeve joint.