JPH0432497Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a mounting structure for a double shaft bearing member.
In particular, the present invention relates to a mounting structure for a double shaft bearing member that facilitates mounting.

[Prior art] Conventionally, aircraft such as helicopters, blowers, pumps, etc. have been known to be equipped with counter-rotating blades, counter-rotating impellers, etc., which can save energy even in large ships, etc. From this point of view, there are concerns about equipping it with counter-rotating propellers. These devices are equipped with dual shafts.

For example, a contra-rotating propeller, as shown in Figure 4, generates thrust by rotating two propellers a and b installed in series in the axial direction at the stern in opposite directions. In this case, a double shaft d is employed to drive these propellers a and b with the main engine c. This double shaft d is constructed by inserting an inner shaft f, which drives the other propeller a, into a hollow outer shaft e, which drives one propeller b, so that the rotational driving force of the main engine c drives the gear train g, etc. The rotational speed is transmitted in opposite directions through the shafts, so that the rotation speeds are approximately equal to each other and rotated in opposite directions.

[Problems to be solved by the invention] By the way, when the inner shaft f is inserted into the outer shaft e,
In particular, when rotating shafts with considerable weight, such as marine shaft systems, are installed horizontally, it is required that the weight of one of the shafts be supported by the other while allowing relative rotation. A bearing member h is interposed between f.

As shown in FIG. 2, the conventional mounting structure for the bearing member h is to attach an inner ring i for fitting the bearing member h to a predetermined position of the inner shaft f, and to attach the outer shaft e to the inner shaft. The shaft end j is positioned near the inner ring i by inserting it into the outer shaft e, and then a flange joint k is attached to the outer shaft e for connecting it to the gear train g. In particular, when fixing the flange joint k to the outer shaft e, an outer ring m fixed to the outer circumference of the outer shaft e with a nut l has an inner tapered surface p matching the outer tapered surface n. By attaching the flange joint k and supplying pressure oil to the oil chamber q between the nut l and the flange joint k, the flange joint k is moved along the tapered surface on the outer ring m and fitted. The outer shaft e and the flange joint k are connected and fixed by a radially inward pressing force applied by the tapered surface. After fixing the outer shaft e and the flange joint k in this way,
As shown in FIG. 3, a bearing member h was fitted between the inner peripheral surface of the joint k and the outer peripheral surface of the inner ring i.

However, in such a mounting structure, since the bearing member h is fitted between the inner ring i and the joint k, which have already determined dimensions, the mounting work is difficult due to dimensional constraints. Moreover, excessive pre-force may act on the bearing member h, which is a problem.

[Means for Solving the Problems] The present invention provides mounting of a bearing member for relatively rotatably supporting a hollow outer shaft and an inner shaft inserted into the outer shaft in the axial direction. In the structure, the inner shaft extends outward from the shaft end of the outer shaft, and an annular bearing member is attached to the outer peripheral surface of the extension of the inner shaft adjacent to the shaft end of the outer shaft. At the same time, an outer ring having a tapered outer circumferential surface is attached to span the outer periphery of this bearing member and the above-mentioned outer shaft, and a flange joint having a tapered inner circumferential surface is fitted into the outer ring. It is characterized in that the outer shaft and the bearing member are fixed by pressing radially inward.

[Function] According to the above configuration, the bearing member is attached to the inner shaft, the outer ring is attached to the outer periphery of the bearing member and the outer shaft, and the flange joint is further fitted to the outer periphery. The bearing member and the outer shaft are both pressed radially inward by the tapered inner circumferential surface and the tapered outer circumferential surface of the outer ring, and are pressed and fixed together. This makes it possible to simultaneously attach the outer shaft and the bearing member without being constrained by other attachments as in the past.

[Embodiment] A preferred embodiment of the present invention will be described below in detail with reference to the accompanying drawings.

As shown in Fig. 1, the double shaft 1 has a hollow outer shaft 2.
and an inner shaft 3 inserted into the outer shaft 2 along its axial direction. In the mounting structure of the bearing member according to the present invention, the inner shaft 3 is arranged to extend outward from the bearing portion 2a of the outer shaft 2. The outer circumferential surface 3 of the extending portion of the inner shaft 3 is exposed to the outside of the outer shaft.
An annular bearing member 4 is attached in advance to the shaft end 2a of the outer shaft 2 adjacent to the shaft end 2a of the outer shaft 2. Specifically, the inner shaft 3
An inner ring 5 is fitted onto the outer circumferential surface 3d of the extending portion adjacent to the shaft end 2a of the outer shaft 2, and a bearing member 4 is fitted onto the outer circumferential surface of the inner ring 5. The bearing member 4 is fixed by being inserted between the shaft end 2a of the outer shaft 2 and the shaft end 2a of the outer shaft 2 by means of a nut 6 which is screwed into the inner ring 5 along its axial direction. In this embodiment, the bearing member 4 is exemplified as a self-aligning roller bearing.

The outer circumferential surfaces of the bearing member 4 and the outer shaft 2 mounted on the inner shaft 3 in this way are then successively stretched between them to press them radially inward toward the inner shaft side while applying the pressing force. A pressing means 7 is provided for integrally joining these. In this embodiment, a joint device for connecting the outer shaft 2 to a gear train or the like is employed as the pressing means 7. This coupling device mainly includes a sleeve-shaped outer ring 8 having a tapered outer circumferential surface 8a that is installed across an outer shaft 2 and a bearing member 4; A flange joint 9 having a tapered inner peripheral surface 9a matching the surface 8a and movable along the axial direction, and a flange joint 9 screwed onto one end of the outer ring 8 to fix it to the outer shaft 2. It fits into the recessed groove 9b of the flange joint 9, and an oil chamber 10 is formed between them.
The oil port 12 is formed in the flange joint 9 and communicates with the oil chamber 10. Then, the flange joint 9 that supplies pressure oil to the oil chamber 10 takes a reaction force from the nut body 11 fixed to the outer shaft 2 and moves along the axial direction on the outer circumferential surface 8a of the outer ring 8. Fitting 9
is designed to be deeply fitted into the outer ring 8. Then, as the flange joint 9 is fitted into the outer ring 8, the outer ring 8 pushes the outer shaft 2 due to the pressing force applied radially inward by the tapered surface.
and the bearing member 4 can be pressed radially inward toward the inner shaft side at the same time, and these can be integrally joined.

In this embodiment, the outer ring 8 having a long tapered surface and the flange joint 9 are stretched between the outer shaft 2 and the bearing member 4 to apply a pressing force. A uniform pressing force can be applied from the bearing member 4 to the bearing member 4, and excessive pressing force can be prevented from being applied locally, thereby ensuring the structural integrity of the mounting portion.

[Effects of the Invention] In summary, the present invention provides the following excellent effects.

A bearing member is attached to the inner shaft in advance, an outer ring is attached to the outer periphery of the bearing member and the outer shaft, and a flange joint is further fitted to the outer periphery, so that the tapered inner peripheral surface of the flange joint and the tapered outer peripheral surface of the outer ring are fitted. Since the bearing member and the outer shaft are integrally pressed inward in the radial direction, the bearing member can be easily installed without being subject to dimensional restrictions when installing the bearing member as in the past. In addition, the outer shaft and the bearing member can be joined together at the same time, and the workability of attaching the bearing member can be improved.

[Brief explanation of drawings]

Fig. 1 is a side sectional view showing a preferred embodiment of the present invention, Figs. 2 and 3 are side sectional views illustrating conventional installation work, and Fig. 4 is a side sectional view showing an example of the adoption of a double shaft. It is a schematic side sectional view. In the figure, 2 is the outer shaft, 2a is the shaft end, 3 is the inner shaft, 3a is the outer peripheral surface of the extending part, 4 is the bearing member, and 7
is a pressing means.

Claims (1)

[Scope of utility model registration request] In a mounting structure for a bearing member for relatively rotatably supporting a hollow outer shaft and an inner shaft inserted into the outer shaft in the axial direction, the inner shaft is attached to the shaft end of the outer shaft. An annular bearing member is mounted on the outer circumferential surface of the extending portion of the inner shaft adjacent to the shaft end of the outer shaft, and is hung between the bearing member and the outer circumference of the outer shaft. A flange joint having a tapered inner circumferential surface is fitted onto the outer ring to press the outer shaft and the bearing member radially inward. A mounting structure for a double-shaft bearing member, which is characterized in that it is fixed in place.