JPH0129287Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for fastening two concentrically arranged shafts.

BACKGROUND OF THE INVENTION Devices are known in the art for connecting shafts arranged concentrically butt to each other. Generally, in conventional devices, one of the pair having a wedge-shaped cross section,
By assembling the circumscribing rings in an overlapping manner, placing some of these assemblies between the shaft to be fastened and the outer sleeve, and pressing these rings toward each other by suitable means, the respective rings are The slopes of the other ring cooperate with the slopes of the other ring to apply a force that displaces the circumscribed ring toward the inner surface of the outer sleeve and the inner ring toward the outer surface of the unfastened shaft, thereby causing the two shafts to move toward each other. The agreement is now being concluded. The means for pressing these inner and outer rings toward each other consists of two pressing rings that engage at both ends of the ring assembly and bolts that are threaded into alignment holes provided on these rings, and the bolts are tightened. By moving the pressure rings toward each other, the inner and outer rings are displaced toward each other. This configuration requires at least one pair of inner and outer rings, and another pair of pressure rings on the outer sleeve to which the outer ring applies force when the outer ring is displaced, and requires a relatively large number of parts. Furthermore, it is common to use a plurality of pairs of inner and outer rings, but in this case the assembly work becomes complicated.

An object of the present invention is to provide a shaft fastening device that has a small number of parts and is very simple and easy to assemble.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

Referring to FIGS. 1 and 2, the shaft fastening device according to the embodiment of the present invention has a flexible hollow cylindrical portion 1. As shown in FIG. This hollow cylindrical part has an inner diameter part 2 which surrounds the outer surface of the shaft to be fastened or the outer surface of the sleeve member used for fastening, as will become clear from the description below. The hollow cylindrical part 1 includes
A pair of flanges 3 are provided extending radially outward from each end thereof and facing each other in a predetermined spaced relationship.

Each flange 3 is provided with a plurality of through holes 4 equally spaced in the circumferential direction, as best seen in FIG. Each through hole in each flange is aligned with a corresponding through hole in the other flange, and one of the aligned through holes is threaded. In the drawing, a thread is provided in the through hole of the right flange 3. The aligned holes 4 each have a bolt 5 passed through them, and by tightening the bolts 5 the flanges 3 are displaced towards each other so that the hollow cylindrical part 1 is disposed as best seen in FIG. It bends convexly inward.

Such a shaft fastening device, for example,
Use as shown in Figures 4 and 6. In this case, one of the two shafts 6 and 7 to be fastened has a blind hole 8 provided in the axial direction from the end surface,
The corresponding end of the other shaft 7 forms a reduced diameter portion 9 . With the reduced diameter portion 9 of the other shaft 7 inserted into the blind hole 8 of one shaft 6, the shaft fastening device of the present invention is placed around this joint, as best seen in FIG. Next, bolts 5 are passed through each of the through holes 4 of the flange 3, and each bolt 5 is tightened as shown by the arrow 10 in FIG. thus,
As mentioned earlier, flange 3 is indicated by arrow 1 in Fig. 4.
1, the hollow cylindrical portions 1 are deflected radially inward to a substantially uniform extent in the circumferential direction, and their inwardly convex inner surfaces touch the portion of the shaft 6 where the blind hole 8 is located. Applying a force indicated by arrow P in FIG. 4, it is pressed radially inward and strongly engaged with the reduced diameter portion 9 of the other shaft 7, thereby firmly connecting these shafts 6, 7 to each other. It turns out.

The inner diameter portion of the hollow cylindrical portion 1 has an inner diameter D1, as shown in FIG.
This diameter difference is selected depending on the bending characteristics of the hollow cylindrical portion 1. In this way, the desired degree of force to be applied to the shaft can be obtained. In the previous embodiment, a plurality of through holes are provided in each flange at equal intervals in the circumferential direction, but as shown in FIG. 7, pairs of through holes are provided in pairs at equal intervals in the circumferential direction. It's okay. in short,
It is sufficient to apply force evenly to the flange in the circumferential direction.

In addition, in the above embodiment, the shaft fastening device applies force directly to the outer surface of the shaft, but a separate sleeve is provided so as to overlap both of the two shafts arranged concentrically in abutting state. The sleeve may be arranged to apply a radially inward force on the outer surface of the sleeve. In this case, it is preferable to arrange two shaft fastening devices at positions corresponding to the ends of the respective shafts.

[Brief explanation of drawings]

FIG. 1 is a partially sectional side view of a shaft fastening device according to an embodiment of the present invention. FIG. 2 is a front view of the shaft fastening device of FIG. 1. FIG. 3 is a diagram showing a state in which the shaft fastening device shown in FIGS. 1 and 2 is placed on a shaft to be fastened, but is not yet in a fastened state. FIG. 4 is a diagram showing the shaft fastening device changed from the state shown in FIG. 3 to the fastened state. FIG. 5 is a diagram showing the fastening state of the shaft fastening device in more detail. FIG. 6 is a partially sectional side view showing the shaft fastening device of the present invention in a state where two shafts are completely fastened. FIG. 7 is a diagram illustrating another embodiment of the present invention. In the drawings, 1...Hollow cylindrical part, 2...Inner diameter part, 3...Flange, 4...Through hole, 5...Bolt, 6, 7...Shaft, 8...Blind hole, 9...Reduction Diameter.

Claims (1)

[Scope of utility model registration request] A shaft fastening device for mutually fastening two concentrically arranged shafts, which is a flexible hollow shaft having an inner diameter slightly larger than the outer diameter of the shaft to which the fastening force is applied. It has a cylindrical part and a pair of flanges extending radially outward from each end of the hollow cylindrical part and facing each other at a predetermined distance apart, each flange having a plurality of through holes in the circumferential direction. A shaft fastening device, wherein each through hole in one flange is aligned with a corresponding through hole in the other flange, and one of the mutually aligned through holes is a threaded hole.