JPH0124425Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a friction joint (self-fixing element) of a friction transmission mechanism.

Conventional friction joints that connect the shaft and hub of a rotating mechanism include those that combine two tapered rings and those that combine multiple ring materials integrally with clamping bolts. However, in the former case, because the width of the taper ring is narrow, a high level of surface pressure is applied to the shaft and hub, which requires special heat treatment of the material.
In addition, the tapered ring is likely to get caught in the shaft or hub, resulting in an accident where it cannot be removed.
Since the transmitted torque is small, it is inconvenient that two or more sets of tapered rings must be installed, and furthermore, auxiliary joint attachment means such as flanges, piston rings, and clamping bolts must be designed and prepared separately by the user. The need arose. On the other hand, in conventional friction joints that are made up of multiple ring materials that are integrally assembled using clamping bolts, the outside diameter of the joint that contacts the hub is larger than the inside diameter of the joint that contacts the shaft because it is made up of multiple ring materials. This limits the range of use, and since the axial dimension is short, the surface pressure acting on the shaft is considerable, requiring it to be manufactured from high quality materials. Because of this, concentricity is poor and centering work between the shaft and hub is essential, and the large number of parts makes it expensive. There is also a joint that connects the shaft and hub by sealing a pressure medium inside the sleeve and deforming the sleeve by pressurizing the pressure medium, but since wax is used as the pressure medium, it cannot be used under conditions other than normal temperatures. It was unsuitable for me.

Therefore, this invention consists of two ring parts, a female tapered ring part and a frusto-conical male tapered ring part, which are connected to each other by a clamping bolt. It is an object of the present invention to provide a friction joint that overcomes the drawbacks of the conventional friction joints mentioned above.

As shown in FIG. 1, a conventional joint 1 consisting of a combination of two tapered rings has two tapered rings inserted into an annular groove 3 provided in a hub 2 with a shaft 4 inserted therethrough. Consisting of taper rings 5 and 6,
To connect the shaft 4 and the hub 2, screw the male threaded portion of the clamping bolt 9, which is inserted into the through hole 8 of the flange 7 that is inserted into the shaft 4, into the female threaded hole 10 of the hub 2, and then screw the flange 7 to drive the piston ring 11 in the tapered ring direction,
By driving the piston ring 11, the taper rings 5 and 6 are brought into pressure contact with each other, and the taper rings 5 and 6 abut against each other on their tapered surfaces.
The tapered ring 5 slides in the radial direction and the annular groove 3
The tapered ring 6 is pressed against the inner circumferential surface of the shaft 4, and the rings 5 and 6 are pressed against the shaft and the hub to form a frictional connection between the shaft and the hub. It was accompanied by various drawbacks.

The conventional joint 21, which is formed by integrally combining a plurality of ring materials with a clamping bolt, has a tightening taper provided with an outer tapered ring 25, an inner tapered ring 26, and a female screw hole 29, as shown in FIG. Consists of four ring materials: a ring 27 and a tightening tapered ring 28 provided with a through hole 30, which is maintained in an integral shape by a clamping bolt 31 that is inserted into the through hole 30 and screwed into the female threaded hole 29. In order to connect the shaft 24 and the hub 22, the joint 21 is inserted into the shaft 24 and fitted into the annular groove 23 of the hub 22, and after the fitting is completed, the clamping bolt 31, that is, the tightening taper ring 2
The tapered ring 2 is inserted through the through hole 30 of 8 and tightened.
The clamping bolt 31 screwed into the female threaded hole 29 of No. 7 is tightened, and the tightening taper rings 27 and 28 are slid toward each other, and the tightening taper rings 27 and 28 are attached to the outer and inner tapered rings 25 and 26. . is in pressure contact with the inner peripheral surface of the annular groove 23, and the inner tapered ring 26 is in pressure contact with the inner circumferential surface of the annular groove 23, and the inner tapered ring 26
It is pressed against the outer circumferential surface, thereby creating a frictional connection between the shaft and the hub, and because it is made of four ring materials, it has the above-mentioned drawbacks.

A joint 41 as an example of this invention shown in FIGS. 3 and 4 consists of two ring members: a male tapered ring portion 45 in the shape of a truncated cone, and a female tapered ring portion 46 forming an inner cavity of the same shape. The male tapered ring portion 45 is a tapered ring material formed into a truncated cone shape in cross section so that its thickness gradually becomes thinner from one side to the other in the axial direction. At equally spaced positions, female screw holes 47 in the axial direction are provided in a penetrating manner and fit into the tapered annular groove 48 of the female tapered ring portion 46 . Similarly, the female tapered ring portion 46 is a ring member provided with a tapered annular groove 48 formed so that the width gradually decreases from one side to the other in the axial direction, and is the bottom of the tapered annular groove 48. The flange wall 49 is provided with an axial through hole 50 as a guide hole and a female screw hole 52 having a larger diameter than the through hole 50, corresponding to the female screw hole 47. The clamping bolt 51 is threaded into the female threaded hole 47 of the male tapered ring portion 45 through both the guide hole 50 and the female threaded hole 52. This is done by tightening the bolt 51. That is, when the joint 41 inserted through the shaft 44 is fitted into the annular groove 43 of the hub 42 and the clamping bolt 51 is tightened after the fitting is completed, the male tapered ring portion 45 and the female tapered ring portion 46 approach each other. The outer cylinder part 54 of the female taper ring 46 is pushed outward and expands, and the inner cylinder part 55 is moved inward. The outer cylinder portion 54 is pressed against the inner peripheral surface of the annular groove 43, and the inner cylinder portion 55 is pressed against the shaft 44, thereby achieving a frictional connection between the shaft and the hub. be done. When removing the joint, after removing the clamping bolt 51, screw the large-diameter extrusion bolt 53 into the large-diameter female threaded hole 52 provided at an appropriate location, and screw the extrusion bolt into the screw drive to remove both the clamping bolts 51. Disassemble the ring part.

The friction joint of this invention has an integral structure in which the male taper ring part and the female taper ring part, which fit into each other on the tapered surfaces, are connected by a clamping bolt, and the engagement between the taper groove and the tapered ring member The concentricity between the inner and outer diameters is good, and the contact length with the shaft and hub is relatively long, so there is no risk of jamming into the shaft or hub.
It is easy to install and remove, is convenient to handle, operates reliably, and has excellent practical effects.

[Brief explanation of drawings]

Figure 1 is a partial sectional view showing a conventional joint;
This figure is a partial sectional view showing another conventional joint, FIG. 3 is a partial sectional view showing an example of this invention, and FIG. 4 is an exploded perspective view of the embodiment of FIG. 3. Explanation of symbols, 1...Joint, 2...Hub, 3...
Annular groove, 4...shaft, 5, 6...tapered ring,
7...Flange, 21...Joint, 22...Hub,
23... Annular groove, 24... Shaft, 25, 26... Taper ring, 27, 28... Tightening ring, 4
1... Joint, 42... Hub, 43... Annular groove, 4
4...Shaft, 45...Male taper ring part, 46
...Female taper ring part, 51...Clamping bolt.

Claims (1)

[Scope of utility model registration request] An annular groove 43 is provided around the shaft to be attached to the hub,
A truncated conical inner cavity 48 is formed in the female taper ring 46 inserted into the annular groove 43 with the axis as the center, and the female taper ring 45 inserted into the inner cavity 48 is shaped like a truncated cone. The male taper ring 45
The flange portion 4 of the female taper ring 46
A friction joint formed by connecting male and female tapered rings 45 and 46 with a clamping bolt 51 screwed in from 9.