JPS6114749Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a fastening device between a shaft and a rotating body, and in particular to a fastening device with a simple structure that improves the positioning accuracy and centering accuracy of the rotating body when a wedge ring is used. .

Figure 1 shows a conventional fastening device between a shaft and a rotating body using a wedge ring, where 1 is a rotating shaft, 2 is a rotating body such as a gear, 3 is two sets of wedge rings, and 4 is a pressure ring. Then, by tightening the bolt 5, pressure is applied to the wedge ring 3, and the rotating body 2
Fasten to shaft 1. A fastening device having such a structure is small and inexpensive, and is suitable when the outer diameter of the boss of the rotating body is small. However, it has the following drawbacks.

(1) Pressure is applied to the bolt holes and threaded holes in the pressure ring 4 and the rotating member 2, which are manufactured to fit the shaft 1 and the rotating member 2, which is cumbersome to manufacture, and it is also difficult to provide screw holes in the rotating member. If it is difficult to install, it cannot be concluded.

(2) Since the wedge ring deforms in any way according to the tightening force of the bolt and has no centering function itself, a finished guide surface for centering must be formed on the inner surface of the center hole of the rotating body or on the shaft. Processing is always troublesome.

(3) When removing the rotating body from the shaft, the wedge ring is small and difficult to remove.

The object of the present invention is to provide a fastening device for a shaft and a rotating body that eliminates the above-mentioned conventional drawbacks.

Examples of the present invention will be described below with reference to FIGS. 2 to 4. A rotating body 2 fastened to the shaft 1 has a shaft through hole 4 in its boss 3 having an inner diameter sufficiently larger than the outside diameter of the shaft 1, and the rotor 2 fits into the gap between the shaft 1 and the shaft through hole 4. The assembly 7 of the inner cylinder 5 and outer cylinder 6 is fitted. The inner cylinder 5 and the outer cylinder 6 each have a cylindrical part 8 that fits externally on the shaft 1 and a cylindrical part 9 that fits internally in the shaft through hole 4.
An internal flange portion 10 that fits onto the shaft 1 is formed at the inner end of the boss 3, and an external flange portion 11 that abuts the outer surface of the rotating body 2 is formed at the outer end. forms a flange portion 12 that fits inside the cylindrical portion 9 of the outer cylinder 6 and is inscribed in the flange portion 10 .

In the above-mentioned fitted state of the inner and outer cylinders 5, 6, the outer end of the cylindrical portion 8 extends to the outer end of the outer flange portion 11. A plurality of pairs (two pairs in FIG. 2) of wedge rings 13 are fitted between the cylindrical portions 8, 9, and the pressure flange 14 is
The cylindrical portion 15 protruding from the wedge ring 13 is fitted between the cylindrical portions 8 and 9 and abuts against the end surface of the wedge ring 13.
3 is located between the flanges 11 and 12 and at approximately the center of the axial length of the cylindrical portion 9, and each wedge ring 13
The bearing has inner and outer rings which are in sliding contact with each other via conical surfaces.

The pressure flange 14 has a flange portion 16 facing the external flange portion 11, and bolts 18 inserted into bolt holes 17 provided at equal intervals in the flange portion 16.
When screwed into the threaded hole 19 provided in the flange portion 11 and tightened, the inner and outer rings of the wedge ring 13 slide along the opposing conical surfaces, and the wedge action causes the cylindrical portions 8 and 9 to be separated. Pressurize inwardly and outwardly. The cylindrical portions 8 and 9 are thin enough to be elastically deformed by the pressing force, and the rotating body 2 is fastened to the shaft 1 by this deformation. In addition. As shown in FIG. 4, if axial slits 20 and 21 are provided in the cylindrical portion 9 and flange portion 10 of the inner tube 5 and outer tube 6, the cylindrical portions 8 and 9 will be easily deformed and the fastening force will be reduced. Losses will be small.

Since the inner and outer cylinders 5 and 6 extend in the axial direction beyond both ends of the entire wedge ring 13, the wedge force of the wedge ring 13 is dispersed in the axial direction and is applied to the surface of the shaft 1 and the shaft through hole 4. , not locally concentrated. Therefore, even if the materials of the shaft 1 and the boss 3 cannot withstand high stress, the present invention allows a large fastening force to be obtained. Note that when multiple wedge rings 13 are arranged in the axial direction, the end wedge ring that receives direct pressure will generate the maximum fastening force, and the next wedge ring will generate 2/1 of that fastening force. Therefore, if the wedge ring 13 is arranged so that the maximum fastening force is applied to the thickest part of the rotating body 2 and a small fastening force is applied to the thinner end of the boss, the rotation can be achieved most rationally. It can be fastened around the body.

In addition, in the present invention, since the centering accuracy between the shaft 1 and the rotating body 2 is determined by the accuracy of the height dimension of the flange portion 10, the rotating body 2 can be centered on the shaft 1 even if the wedge ring 13 does not have a centering function. Can be fastened with high centering accuracy.

In order to prevent the rotating body 2 from shifting when tightening the bolt 18, a radial screw hole 22 is provided in the external flange portion 11, and a set screw 23 is screwed into the screw hole 22.
If it is tightened to the shaft 1 through the play holes drilled in the cylindrical parts 8 and 9, the rotating body 2 can be accurately positioned in the axial direction and the circumferential direction, and while the bolt 18 is tightened, the flange part 11 There is no need to hold it down, making tightening work easier. In order to maintain rotational balance, a plurality of screw holes 22 and the above-mentioned free holes may be provided in the circumferential direction.

In another embodiment shown in FIG. 5, the inner cylinder 5 shown in FIG. Since the outer diameter of the boss 3 is small, strong fastening is possible, and this is suitable when the outer diameter of the boss 3 is small.

The present invention has the above configuration, and the accuracy of the axial position and centering of the rotating body with respect to the shaft is good,
If the inner cylinder or this and the outer cylinder are made with a simple structure to match the shaft diameter and the inner diameter of the shaft through hole, the pressure flange can be used in common, and there is no need to machine screw holes on the rotating body. Therefore, the number of machining steps can be reduced compared to conventional methods, it is also possible to fasten rotating bodies for which it is difficult to machine screw holes, and the rotating body can be easily removed from the shaft by pushing the outer cylinder out of the shaft through-hole. It has excellent effects such as being able to.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of a conventional fastening device, Fig. 2 is a sectional view taken along line A-A in Fig. 3 of an embodiment of the present invention, Fig. 3 is a left side view of Fig. 2, and Fig. 4 is an internal view. , a perspective view of the outer cylinder, and FIG. 5 is a sectional view similar to FIG. 2 of another embodiment of the present invention. 1...Shaft, 2...Rotating body, 5...Inner cylinder, 6...
Outer cylinder, 8, 9...Cylindrical part, 10...Inner flange part, 11...Outer flange part, 12...Flange part, 13...Wedge ring, 14...Pressure flange, 1
5... Cylindrical part, 16... Flange part, 23... Set screw.

Claims (1)

[Scope of utility model registration request] In a fastening device that fastens the rotating body to the shaft by applying pressure in the axial direction to a wedge ring that is inserted into the gap between the shaft through-hole of the rotating body and the shaft and has an inner and outer ring in sliding contact with each other with a conical surface, the shaft through-hole An outer flange having an inner flange portion that fits on the shaft formed at the inner end of the shaft through hole of the cylindrical portion and an outer flange portion that is formed at the outer end opposite to the inner end and contacts the side surface of the rotating body. a pressure flange having a cylinder, a flange part bolted to the outer flange part, and a cylindrical part protruding from the flange part into the outer cylinder; Fastening the rotating body to the shaft, which has a wedge ring that is radially deformed by the clamping pressure between the cylinder and the rotating body to fasten the rotating body to the shaft, and a set screw that fastens the outer cylinder to the shaft at the external flange. Device.