JPH06249254A - Fastening device of shaft and rotor fastenable with two bolts - Google Patents

Abstract

PURPOSE:To provide a fastening device in which a shaft or a rotor does not corotate by fastening mutual fastening members by means of bolts in the radial direction. CONSTITUTION:In the fastening device 10, at first a shaft 12 is inserted between rotors 14. By threadedly advancing a sleeve 50 against an inner race 20, the taper face 36 and the taper face 66 are contacted with each other and the taper face 56 and the taper face 67 are contacted with each other. Next bolts 70, 71 are screwded in. Then fastening members 60 are contracted in the circumferential direction, and an outer race 30 is relatively moved in the axial direction against the inner race 20, by wedge action of the taper faces 36, 66. When the gap between flange parts is narrowed, the diameter of the inner race 20 is contracted, the diameter of the outer race 30 is spread, and the shaft 12 and the rotor 14 are fastened together by generated surface pressure. Further, by loosening the bolts 70, 71 or the sleeve 50, the fastening is released.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shaft-rotator fastening device that does not use a key. This type of fastening device is used, for example, to fasten a rotating body such as a gear, a sprocket, or a wheel to a shaft.

[0002]

2. Description of the Related Art FIGS. 10 and 11 are sectional views of a conventional fastening device of this type. The fastening device 410 has an inner race 414 having an outer peripheral taper surface 412 formed therein and an outer race 418 having an inner peripheral taper surface 416 formed therein. The inner race 414 has a flange portion 420
In the outer race 418, a large number of axial through holes 422 are formed, and in the outer race 418, a large number of axial screw holes 424 are formed. The bolt 426 is screwed into the screw hole 424 through the through hole 422.
Screw together. When the bolt 426 is tightened, the tapered surface 41
2, 416 are wedge-engaged with each other. As a result, the diameter of the inner race 414 is reduced and the diameter of the outer race 418 is enlarged, and the surface pressure generated causes the shaft and the rotating body to be fastened. And
Torque is transmitted by frictional force.

[0003]

However, in the fastening device 410 as described above, the bolt 426 must be tightened in the axial direction, and it is difficult to mount the fastening device 410 in a narrow place. Further, when the bolt 426 is tightened, the shaft or the rotating body tries to rotate together, which is inconvenient because it must be prevented by other means.

Further, in this type of fastening device 410, it is necessary to fasten the inner race 414 and the outer race 418 with a uniform force in each portion in the circumferential direction, and therefore the number of bolts 426 must be increased.

An object of the present invention is to provide a fastening device which can be fastened by tightening the bolts in the radial direction and which can be fastened with two bolts.

[0006]

According to the present invention, firstly, the inner race is reduced in diameter and the outer race is enlarged by wedge-tapping the tapered surfaces to fasten the shaft and the rotating body. In the fastening device, a conical tapered surface formed at an axial end portion of the outer race, a sleeve provided at an axial end portion of the inner race, the axial end portion of the outer race and the sleeve. And a shaft having a pair of C-shaped tightening members that are interposed between the conical tapered surfaces and that have a conical tapered surface that complements the conical tapered surface, and a pair of bolts that tighten the tightening members in the circumferential direction. The above-mentioned problem was solved by the body fastening device.

Secondly, the present invention relates to a fastening device for fastening a shaft and a rotor by reducing the diameter of the inner race and expanding the diameter of the outer race by wedge-tapping the tapered surfaces. A pair of tapered surfaces that are formed at the end of the race in the axial direction and that are symmetrical with respect to a plane including the center line of the shaft and that are inclined with respect to a plane perpendicular to the axis, and that are provided at the end of the inner race in the axial direction. Sleeve,
A pair of C-shaped tightening members, which are interposed between the axial end portion of the outer race and the sleeve, and have tapered surfaces complementary to the respective tapered surfaces of the outer race, and the tightening members. The above problem has been solved by a fastening device for a shaft and a shaft having a pair of bolts for circumferentially tightening.

[0008]

The fastening member is interposed between the axial end of the outer race and the sleeve. When the bolt is tightened, the tightening member contracts in the circumferential direction. The sleeve prevents axial movement of the clamping member with respect to the inner race. Therefore, the tightening member axially presses the outer race by contraction.

As a result, the diameter of the inner race is reduced, the diameter of the outer race is enlarged, and the surface pressure generated causes the shaft and the rotating body to be fastened.

[0010]

Embodiments of the fastening device according to the present invention will be described below with reference to the drawings. 1 to 3 show a first embodiment of the fastening device. The fastening device 10 is an inner race 2
0, outer race 30, fastening ring 40, sleeve 50,
A pair of tightening members 60, 60, and a pair of bolts 70,
70 is included.

The inner race 20 is a thin cylindrical portion 2
2, a flange portion 24 extending outward in the radial direction at one end thereof, and a screw portion 26 formed at the other end. The inner diameter of the inner race 20 is slightly larger than the outer diameter of the shaft 12. 28 is a slit that penetrates in the axial direction.

The outer race 30 is a thin cylindrical portion 3
2 and a flange portion 34 that extends radially inward at one end thereof. The axial end surface of the flange portion 34 is a conical tapered surface 36 such that the axial thickness of the flange portion 34 becomes thicker toward the center. Outer race 3
The outer diameter of 0 is slightly smaller than the inner diameter of the rotating body 14. 38 is a slit that penetrates in the axial direction.

The fastening ring 40 comprises an inner ring 42 having a tapered surface formed on the outer circumference thereof and an outer ring 44 having a tapered surface formed on the inner circumference thereof. In the case of this embodiment, three pairs of the inner ring 42 and the outer ring 44 are provided. The fastening ring 40 is interposed between the flange portion 24 of the inner race 20 and the flange portion 34 of the outer race 30. When the inner race 20 and the outer race 30 move relative to each other in the axial direction, the inner race 20 contracts and the outer race 30 expands due to the wedge action of the tapered surface.

The sleeve 50 is screwed onto the thread portion 26 of the inner race 20. On the outer race 30 side, the sleeve 50 is provided with a conical tapered surface 56 that is symmetrical to the conical tapered surface 36 of the outer race 30 with respect to the plane perpendicular to the axis.

The tightening member 60 has a structure in which C-shaped divided pieces face each other. One of the divided pieces has a notch 61 and a through hole 62 at one end and a screw hole 63 at the other end. The same applies to the other divided piece. Also,
A fastening release screw hole 64 is formed at the center. On the tightening member 60, a conical taper surface 66 that complements the conical taper surface 36 of the outer race 30 is formed on the outer race 30 side. Also, the sleeve 50
On the side, a conical taper surface 67 is formed which complements the conical taper surface 56 of the sleeve 50.

In the present invention, the number of bolts 70, 70 is two. The bolt 70 has a through hole 62 of the one tightening member 60.
Through the screw hole 63 of the other tightening member 60.

Next, the operation will be described. The fastening device 10 is first inserted between the shaft 12 and the rotation 14. When the sleeve 50 is screwed with respect to the inner race 20, the tapered surface 36 and the tapered surface 66 come into contact with each other, and the tapered surface 56
And the tapered surface 67 abut. Next, the bolts 70, 70 are tightened. The tightening member 60 contracts in the circumferential direction, and the wedge action of the taper surfaces 36 and 66 causes the outer race 30 to move.
Moves relative to the inner race 20 in the axial direction.

When the distance between the flange portions 24 and 34 is narrowed, the inner race 20 and the outer race 44 are reduced in diameter by the wedge action of the inner race 42 and the outer race 44, and the outer race 30 is enlarged in diameter. The body 14 is fastened.

Loosen the bolts 70, 70 or sleeve 5.
The fastening is released by loosening 0. Alternatively, another bolt may be screwed into the fastening release screw hole 64 to auxiliary move the fastening member 60.

FIG. 4 shows a second embodiment of the fastening device according to the present invention. In the fastening device 110 of this embodiment, the bolts are inserted in the same direction. That is, one tightening member 160 has through holes 162, 162 at both ends.
And the other tightening member 161 has screw holes 163 and 163 at both ends. The other structure is substantially the same as that of the first embodiment.

5 to 9 show a third embodiment of the fastening device according to the present invention. The fastening device 210 includes an inner race 220, an outer race 230, a fastening ring 240, a sleeve 250, a pair of tightening members 260 and 260, and a pair of bolts 270 and 270.

The inner race 220, the fastening wheel 240, and the pair of bolts 270 are substantially the same as those of the inner race 20 of the first embodiment, and the description thereof will be omitted.

The outer race 230 has a thin-walled cylindrical portion 232 and a flange portion 234 that extends inward in the radial direction at one end thereof. The flange portion 234 has a pair of tapered surfaces 236 and 236, which are symmetric with respect to a plane including the center line of the axis and are inclined with respect to a plane perpendicular to the axis, on the end surface in the axial direction. The outer diameter of the outer race 230 is slightly smaller than the inner diameter of the rotating body 14.

The sleeve 250 is formed by the inner race 220.
The threaded portion 226 is screwed. On the outer race 230 side, the sleeve 250 is formed with a pair of tapered surfaces 256 and 256 which are symmetrical with respect to a plane including the center line of the shaft and are inclined with respect to a plane perpendicular to the shaft. The pair of tapered surfaces 236 and 236 of the outer race 230 and the tapered surfaces 256 and 256 of the sleeve 250 are symmetrical with respect to a plane perpendicular to the axis.

The tightening member 260 has a structure in which C-shaped divided pieces face each other. One of the divided pieces has a notch 261 and a through hole 262 at one end and a screw hole 263 at the other end. The same applies to the other divided piece. Further, a fastening release screw hole 264 is formed in the center. On the outer race 30 side, the tightening member 260 is formed with a tapered surface 266 that complements the tapered surface 236 of the outer race 230. Further, on the sleeve 250 side, the tapered surface 25 of the sleeve 250
6 is formed as a conical tapered surface 267 that is complementary to the No. 6 shape.

In the fastening device 210 of this embodiment, the bolt 2
By tightening 70 and 270, the tightening members 26
0, 260 approach each other, and the outer race 230 moves in the axial direction.

[0027]

The inventions of claims 1 and 3 have the following unique effects. (1) Since the bolts are tightened in the direction perpendicular to the axis, it is easy to install the fastening device in a narrow space.
Further, when tightening the bolt, a fixing means for preventing co-rotation of the shaft and the rotating body becomes unnecessary. (2) By using the wedge action of the tapered surface between the split type tightening member and the outer race, it is possible to fasten with two bolts, and the action of the tapered surface causes an extremely large axial force. Can be obtained. Further, the inner race and the outer race are pressed in the axial direction with a uniform force.

According to the second and fourth aspects of the present invention, the sleeve can be preliminarily screwed so that the tapered surfaces are in contact with each other, and the fastening work can be speeded up.

[Brief description of drawings]

FIG. 1 is an axial sectional view of a first embodiment of a fastening device according to the present invention.

FIG. 2 is a front view of the fastening device of FIG. 1 with the rotator removed.

FIG. 3 is an exploded perspective view of the fastening device of FIG.

FIG. 4 is an axial sectional view of a second embodiment of the fastening device according to the present invention.

FIG. 5 is an axial sectional view of a third embodiment of the fastening device according to the present invention.

6 is a front view of the fastening device of FIG.

FIG. 7 is a side view of the fastening device of FIG.

8 shows a fastening member used in the fastening device of FIG. 5, (a) is a front view, and (b) is a sectional view taken along line bb.

9 shows a sleeve used in the fastening device of FIG.
(A) is a front view, (b) is a bb line sectional view.

FIG. 10 is an axial sectional view of a conventional fastening device.

11 is a front view of the fastening device of FIG.

[Explanation of symbols]

 10, 110, 210 Fastening device 12 Shaft 14 Rotating body 20, 220 Inner race 24 Flange portion 30, 230 Outer race 34, 234 Flange portion 36, 236 Tapered surface 40 240 Fastening ring 50 250 Sleeve 56 256 Tapered surface 60, 160, 161, 260 Tightening member 66, 67, 256, 257 Tapered surface 70, 270 Bolt

Claims (4)

[Claims] 1. A fastening device for fastening a shaft and a rotating body by shrinking an inner race and expanding an outer race by wedge-tapping tapered surfaces, wherein an axial end portion of the outer race is provided. The formed conical taper surface, the sleeve provided at the axial end portion of the inner race, and the conical taper surface interposed between the axial end portion of the outer race and the sleeve. A fastening device for a shaft and a rotating body, comprising: a pair of C-shaped tightening members having complementary conical tapered surfaces, and a pair of bolts for tightening the tightening members in the circumferential direction. 2. The shaft-rotating body fastening device according to claim 1, wherein the sleeve is screwed with the inner race. 3. A fastening device for fastening a shaft and a rotor by shrinking an inner race and expanding an outer race by wedge-tapping tapered surfaces together, wherein an axial end portion of the outer race is provided. A pair of taper surfaces that are formed and are symmetric with respect to a plane including the centerline of the shaft and that are inclined with respect to a plane perpendicular to the shaft; a sleeve provided at an axial end portion of the inner race; A pair of C-shaped tightening members, which are interposed between the axial end portion of the race and the sleeve, and have tapered surfaces complementary to the respective tapered surfaces of the outer race, and a pair of C-shaped tightening members surrounding the tightening members. A fastening device for a shaft and a rotating body, which has a pair of bolts for tightening in a direction. 4. The shaft-rotating body fastening device according to claim 1, wherein the sleeve is screwed with the inner race.