JPH09264330A - Elastic flexible shaft coupling - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an elastic flexible shaft coupling having an intermediate element made of rubber or similar substance and in which the torsional rigidity is appropriate for the motor power according to the thickness of the shaft. SOLUTION: An elastic flexible shaft coupling is provided with first and second hubs 3, 4 to be fixed to shaft ends of first and second shaft, pins 11, 12 to be projected in the axial direction from a surface opposite to the first and second hubs, and intermediate elements 14, 16 which connect the pins 11, 12 and are made of rubber or similar substance. The intermediate elements 14, 16 comprise a metallic or synthetic resin intermediate disk 14 with high rigidity, a plurality of bush holes 15 through the intermediate disk 14 in the axial direction, and bushes 16 to be press fitted in the bush holes 15, pin holes 18 in which the pins 11, 12 are inserted are made in the bushes 16, the length of the bushes 16 in the axial direction is larger than the width of the intermediate disk 14 in the axial direction, and each end part is projected from each side of the intermediate disk 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elastic flexible shaft coupling in which an intermediate element is made of rubber or a substance similar thereto arranged in parallel with an axis.

[0002]

2. Description of the Related Art An elastic flexible shaft coupling of which a conventional intermediate element is made of rubber or a substance similar thereto is, as shown in FIG. 8, two disc-shaped hubs fixed to the ends of both shafts 1 and 2. 3, 4 and the two pins 11 and 12 planted on the facing surface of each hub, and the pin holes 21 and 2 into which a total of four pins fit
2 and a disc-shaped intermediate element 20 made of urethane resin or rubber. This shaft coupling has eccentricity of both shafts,
It has the effect of absorbing any misalignment such as declination, radial deviation, axial deviation, etc., and also damping peripheral vibrations.

[0003]

The conventional joint described above has a problem that the torsional rigidity is small with respect to the rotational force corresponding to the shaft diameter, that is, the motor power, because the entire intermediate element is rich in elasticity. The present invention has been made to solve this problem, and an object of the present invention is to provide an elastic flexible shaft coupling having a torsional rigidity adapted to the motor power depending on the shaft diameter.

[0004]

In order to achieve the above object, the means adopted by the present invention is to manufacture an intermediate disc made of metal or synthetic resin having high rigidity as an intermediate element, and to produce an even number of intermediate discs. There is a circular hole penetrating in the axial direction of, the bush made of rubber or similar substance is fitted into the circular hole, and pins protruding from the hubs fixed to both shaft ends are press-fitted into the holes of the bush. .

Urethane rubber, nitrile rubber, butyl rubber, chloroprene rubber, and polyurethane elastomer can be used as the rubber constituting the bush or a substance similar thereto. The bush has an axial length longer than the axial width of the intermediate disc, both ends of which are projected from both end faces of the intermediate disc, and a gap is provided between the intermediate disc and the hub end faces on both sides. The bush is press-fitted into the circular hole of the intermediate disk and fixed, or fixed by an adhesive.

When the bush is a vulcanizable rubber, it can be fixed by vulcanization. Furthermore, it is also possible to fill the gap between the intermediate disc and the hubs on both sides with rubber or a substance similar thereto, and a thin disk-shaped elastic material that fills the gap is bonded or vulcanized to the intermediate disc. It may be fixed to both end faces or both the end face of the intermediate disk and the end face of the first or second hub.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION An aspect of the present invention will be described based on a first embodiment shown in FIGS. First and second on both sides
The ends of the shafts 1 and 2 are respectively made of aluminum alloy first and second
The shaft holes 5 and 6 of the hubs 3 and 4 are fitted. The first and second hubs 3 and 4 are split disks, and fixing bolts 7 and 8 are tightened and fixed to their respective shafts. 1 of the first and second hubs
Pin piercing holes 9 and 10 penetrating in the axial direction are made at two symmetrical positions with respect to the diametrical axis, and the pin 1 is placed in the pin stud hole.
1 and 12 are press-fitted and planted. The pins 11 and 12 project from the end faces of the first and second hubs 3 and 4 that face each other.

Four cylinder-shaped bush holes 15 penetrating in the axial direction are formed in an intermediate disk 14 having an aluminum alloy shaft hole 13. Each bush hole 15 is on a concentric circle centered on the axial center, and the mutual central angle is 90 degrees. A rubber bush 16 is press-fitted into each bush hole 15 and fixed.
If necessary, the bush 16 is fixed to the bush hole 15 by an adhesive or vulcanization.

Two pins 11 projecting from one end of the end face of the first hub 3 are arranged in the pin holes 18 of the two bushes 16 arranged in the diametrical direction in the diametrical direction orthogonal to the diametrical direction.
The second hub 4 from the side opposite to the pin hole 18 of each bush 16
The two pins 12 protruding from the
Also, the end surface of the second hub is brought into contact with both ends of the bush 16. Each bush 16 is longer than the axial width of the intermediate disk 14, and both ends thereof project from both end surfaces of the intermediate disk 14. Both ends of the bush 16 protruding from both end surfaces of the intermediate disk 14 form a space 17 between the intermediate disk 14 and the first and second hubs 3 and 4 on both sides.

The shaft joint thus assembled has a structure in which both ends of the bush 16 are in contact with the hubs 3 and 4, and a space 17 is formed between the first and second hubs 3 and 4 and the intermediate disk 14. Therefore, the elastic deflection of the bush 16 absorbs misalignment such as eccentricity, declination of the first and second shafts 1 and 2, play in the rotational direction of the shaft ends and play in the axial direction, and has a function of damping vibration. However, since the bush 16 is held by the intermediate disc 14 having high rigidity, the bush 16 has much higher torsional rigidity than the conventional elastic flexible joint.

This can be confirmed by the measurement results of the torsional rigidity value and the vibration damping rate of the examples and the comparative examples shown in FIGS. FIG. 5 shows measured examples (c, d)
It is a longitudinal cross-sectional view of a comparative example (a, b, e), the first and second hub of these shaft couplings, the intermediate disk, the pin has the same dimensions. Further, the intermediate disk of the comparative example and the bush of the example are made of the same material.

No adhesion is applied between the intermediate disk of Comparative Example a and the first and second hubs, but adhesion is applied between the intermediate disk of Comparative Example b and the first and second hubs. In the example e, leaf springs are adhered to both end faces of the intermediate disk.
In Example c, no adhesion is applied between the pin, the bush and the intermediate disc, whereas in Example d the adhesion is applied between the pin, the bush and the intermediate disc.

As the rubber used for the intermediate disk of the comparative example and the bush of the example, five kinds of chloroprene rubber (C), butyl rubber (B), nitrile rubber (N), urethane rubber (U) and polyurethane elastomer (E) are used. Was measured. 3 and 4 show that the torsional rigidity value of the example is about 19 times on average as compared with the comparative example, and the vibration damping rate is almost the same or slightly higher.

[0014]

EXAMPLE 2 In the second example shown in FIG. 6, the gap 17 between the first and second hubs 3 and 4 made of aluminum alloy and the intermediate disk 14 also made of aluminum alloy can be vulcanized like the bush 16. It is filled with natural rubber. The thin hollow disk portion 19 of rubber filled in the space 17 is vulcanized to form the first and second
It is bonded to the end faces of both the disks 3 and 4 and the intermediate disk 14, and is wholly inseparable.

In the third embodiment shown in FIG. 7, as in the second embodiment, the gap 17 between the first and second hubs 3, 4 and the intermediate disk 14 is filled with the same vulcanizable rubber as the bush 16. The thin disk portion 19 of rubber filling the gap 17 is adhered to the end surface of the disk 14 by vulcanization, but not to the first and second hubs 3 and 4. Therefore, the third embodiment can be divided into three parts. Although the drawing shows the disc portion 19 apart from the end faces of the first and second hubs 3 and 4 in order to exaggerate the non-bonding, they are actually in contact with each other. The second and third embodiments also have the same operation and the same effect as the first embodiment.

[0016]

As described above, the elastic flexible shaft joint of the present invention is made of rubber or a bush similar to the first and second bushes.
Since the shaft is connected, it has the function of absorbing the misalignment and damping the vibration, but since the bush is fixed in the bush hole of the intermediate disc with high rigidity, the whole conventional structure is made of rubber or similar material. It has an excellent effect that the torsional rigidity is very large as compared with the case where the first and second shafts are connected only by the intermediate disk.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of a shaft coupling according to a first embodiment of the present invention,

FIG. 2 is an exploded perspective view of the first embodiment,

FIG. 3 is a graph showing the measurement result of the torsional rigidity value,

FIG. 4 is a graph showing the measurement result of the vibration damping rate,

FIG. 5 is a longitudinal sectional view of an example and a comparative example in which the torsional rigidity value is measured, (a), (b) and (e) are comparative examples, (c),
(D) is an example.

FIG. 6 is a vertical sectional view of a second embodiment,

FIG. 7 is a vertical sectional view of a third embodiment,

FIG. 8 is an exploded perspective view of a conventional elastic flexible shaft coupling,

[Explanation of symbols]

 1: 1st axis, 2: 2nd axis, 3: 1st hub, 4: 2nd hub, 5, 6: Shaft hole, 7, 8: Fixing bolt, 9, 10: Pin installation hole, 11, 12 : Pin, 13: Shaft hole, 14: Intermediate disk, 15: Bush hole, 16: Bush, 17: Void, 18: Pin hole, 19: Disc part

Claims (4)

[Claims] 1. The first and second hubs (3, 4) fixed to the shaft ends of the first and second shafts (1, 2), and the shafts from opposite surfaces of the first and second hubs. Pin protruding in the direction (1
1, 12) and an elastic flexible shaft coupling having an intermediate element (14, 16) made of rubber or a substance similar thereto, which connects the pins, the intermediate element being made of metal or synthetic material having high rigidity. Resin intermediate disc (14)
A plurality of bush holes (15) penetrating the intermediate disc in the axial direction and a bush (16) press-fitted into the bush holes, and the pin holes (18) into which the pins are inserted. ) Is opened, the axial length of the bush is longer than the axial width of the intermediate disc, and both ends of the bush project from both sides of the intermediate disc. 2. The bush (16) is an intermediate disc (1).
The flexible elastic shaft coupling according to claim 1, wherein the elastic flexible shaft coupling is adhered to the bush hole (15) of 4). 3. The first and second hubs (3, 4) formed by the ends of the bush (16) and the intermediate disc (1).
The thin disc portion (19) is formed by filling the gap (17) between the portions (4) with rubber or a substance similar thereto, and the disc portion (19) is bonded to the intermediate disc (14). The elastic flexible shaft coupling according to claim 1 or 2, characterized in that. 4. The disc portion (19) between the first and second hubs (3, 4) and the intermediate disc (14) is provided with the first and second discs (19).
Elastic flexible shaft coupling according to claim 3, characterized in that it is also bonded to the hub (3, 4).