JP2545500Y2 - Coupling - Google Patents

Description

[Detailed description of the invention]

[0001]

This invention relates to couplings.
In particular, the present invention relates to a coupling effectively used for a power transmission unit of an automobile or the like.

[0002]

2. Description of the Related Art Generally, there is provided a coupling provided between a driving side shaft and a driven side shaft to integrally connect the two and to transmit the driving side torque to the driven side. As shown in FIG. 4, a disc-shaped disk 21 integrally connected to one of the drive-side shaft and the driven-side shaft, and a rubber integrally connected to one of the other shafts. A bush 22 is provided.

A mounting hole 23 is formed in the center of the disk 21. A hole 24 penetrating from one side to the other side is formed on a concentric circle at the periphery of the hole 23. The rubber bush 22 is provided at a plurality of locations at predetermined intervals, and the rubber bush 22 is provided in the hole 24.

The rubber bush 22 is formed by integrally connecting a cylindrical outer ring 27 to the outside of a cylindrical inner ring 25 via a rubber elastic body 26. At a position opposed to the elastic body 26 with the inner ring 25 interposed therebetween,
Girder portions 28, 28 extending in a direction perpendicular to the rotation direction and penetrating in the axial direction are provided, respectively, so that the rubber-like elastic body 26 of the inner portion of the girder portions 28, 28 is provided by these girth portions 28, 28. A soft spring constant can be obtained because of easy deformation by shearing. In this case, by using the rubber-like elastic body 26 on the outer side of the burrs 28, 28 as a stopper (see FIG. 5), the burrs 28, 28
It is possible to limit the amount of displacement of the rubber-like elastic body 26 in the inner part of the rubber-like elastic body 26 in the rotation direction.

Further, the rubber-like elastic body 26 has a
With the provision of 8, 28, the rubber-like elastic body 26 is easily displaced also in the axial direction.

[0006] Then, the disk 21 of the coupling constructed as described above is connected to a drive-side shaft or a driven-side shaft (in this case, a drive-side shaft) through a hole 23 at the center thereof.
And the inner ring 25 of each rubber bush 22 fitted in each hole 23 of the disc 21 is driven by a bolt or a driven shaft (in this case, a driven shaft). When the drive-side shaft rotates, the rubber bush 2 is integrally connected to the drive-side shaft.
2 rotates integrally, and the rotation of the rubber bush 22 is transmitted to the driven shaft via the disk 21, whereby the driven shaft rotates integrally with the driving shaft.

[0007] When vibration is input from the drive shaft in the above-described process, the vibration is absorbed by the rubber-like elastic members 26 of the rubber bushes 22. As the spring constant of the elastic body 26 is set lower (softer), the damping property against vibration increases.

However, if the spring constant of the rubber-like elastic body 26 is too low, the damping performance against vibration can be increased, but when a large torque is input, the stoppers outside the squeezing portions 28, 28 are not provided. The rubber-like elastic body 26 acting only as a part cannot limit the displacement of the rubber-like elastic body 26 inside the bulging portions 28, 28, and the rubber-like elastic body 26 is greatly deformed beyond its allowable limit. There has been a problem that the endurance may cause breakage or sag, resulting in a significant decrease in durability.

Further, when the spring constant of the rubber-like elastic body 26 is increased in order to increase the durability, the rigidity of the rubber-like elastic body 26 can be increased even when a large torque is input. There is no danger of the elastic body 26 being broken or sagging, and the durability can be improved. However, by increasing the spring constant of the rubber-like elastic body 26, the damping property against vibration is significantly reduced. There was a problem that would.

This invention solves the above-mentioned problems of the prior art, and can exhibit excellent damping properties against input vibration, and can be damaged or damaged even when a large torque is input. It is an object of the present invention to provide a coupling which is excellent in durability without any possibility of setting.

[0011]

In order to solve the above-mentioned problems, the present invention connects a driving-side shaft and a driven-side shaft integrally to transmit a driving-side torque to the driven-side. A coupling, a boss integrally connected to one of the drive-side shaft and the driven-side shaft, an outer case integrally connected to one of the other shafts, and the boss A plate spring provided between the outer case and the outer case, and a rubber portion provided integrally with the plate spring. When the input torque is small, only the plate spring operates. When a low spring constant is obtained and the input torque is large, the leaf spring deforms so as to wind around the boss, and the rubber portion provided integrally with the leaf spring is located between the boss and the boss. , Only the rubber part acts It is obtained by employing means that high spring constant is obtained.

[0012]

According to the present invention, a soft spring constant can be obtained by the leaf spring which integrally connects the boss and the outer case when the input torque is small by employing the above-mentioned means. When the input torque is large, the leaf spring that integrally connects the boss and the outer case is deformed, and the By winding around the outer peripheral surface, the rubber portion provided integrally with the leaf spring is compressed between the boss and the boss, so that a high spring constant is obtained.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention shown in the drawings will be described below. 1 to 3 show an embodiment of the coupling according to the present invention. FIG. 1 is a plan view showing the whole, FIG. 2 is a cross-sectional view of the one shown in FIG. 1, and FIG. FIG. 4 is an explanatory diagram showing a relationship between a spring constant and a torsion angle.

That is, this coupling is formed by the boss 1
, Outer case 2, leaf springs 3, 4, rubber part 5,
6 and so on.

The boss 1 has a disk-shaped base 7 and a columnar projection 8 formed integrally with the center of the base 7 and has a convex cross section. A mounting hole 9 penetrating from the upper surface side of the protruding portion 8 to the lower surface side of the base portion 7 is formed in the portion, so that the mounting hole 9 is integrally connected to a driving side shaft or a driven side shaft through the hole 9. It has become.

The outer case 2 is formed in a disk shape, and a hole 10 having a diameter slightly larger than the outer diameter of the base 7 of the boss 1 is formed in the center thereof. The base 7 is located on the outer periphery, and a flange 11 rising upward in the figure is provided on the outer peripheral edge in an annular shape over the entire circumference. The protruding portion 8 is located, and the outer case 2 is integrally connected to a driven shaft or a driving shaft by a bolt or the like.

Two leaf springs 3 and 4 are provided between the boss 1 and the outer case 2 constructed as described above. One leaf spring 3 has one end of the boss 1 as shown in FIG. It is fixed to a pin 12 provided on the middle right part, and the other end is provided on the right part of the outer case 2 around the entire circumference of the boss 1 clockwise from the pin 12 as a starting point. Is fixed to the pin 13
One end of the other leaf spring 4 is fixed to a pin 14 provided on a left portion of the boss 1 in the drawing.
4, the other end of the outer case 2 is fixed to a pin 15 provided on the left side of the outer case 2 in a clockwise direction. , 13, 14, and 15 are provided at appropriate positions on the same line passing through the center of rotation.

The rubber portions 5 and 6 having a predetermined thickness are integrally provided on the entire inner surface side (the boss 1 side) of each of the leaf springs 3 and 4 by vulcanization bonding or the like.

The boss 1 of the coupling constructed as described above is integrally connected to a drive-side shaft through a mounting hole 9 at the center thereof, and is located outside the boss 1. When the outer case 2 is integrally connected to the driven shaft by bolts or the like, and the drive shaft is rotated, the boss 1 rotates integrally with the drive shaft, and the rotation of the boss 1 is caused by the leaf springs 3, 4. Is transmitted to the outer case 2 via the outer case 2, and is transmitted from the outer case 2 to a driven shaft that is integrally connected to the outer case 2, and in this manner,
The driven shaft rotates integrally with the driving shaft, and the driving torque is transmitted to the driven shaft.

In such a process, when vibration is input from the drive shaft, the vibration is transmitted to the boss 1 and the outer case 2.
Is absorbed by the elastic force of each of the leaf springs 3 and 4 which integrally connect between them, and in this case, a soft spring constant is obtained only by the leaf springs 3 and 4.
The input vibration can be reliably attenuated.

On the other hand, if a large torque is input, and if the rotation direction is the direction of the arrow in the figure, the torque between the boss 1 and the outer case 2 is relatively displaced in the rotation direction by the input torque. One leaf spring 3 is deformed so as to be wound around the outer peripheral surface of the boss 1 with the pin 12 on the right side of the boss 1 as a fulcrum, and the rubber portion 5 provided integrally on the inner surface thereof is Is compressed with the outer peripheral surface. The other leaf spring 4 is deformed so as to be wound around the outer peripheral surface of the boss 1 with the pin 14 on the left side of the boss 1 in the drawing as a fulcrum, and the rubber portion 6 provided integrally on the inner surface thereof.
Is compressed with the outer peripheral surface of the boss 1. Therefore, the boss 1 and the outer case 2 are integrally formed, so that a high spring constant can be obtained due to the action of only the rubber portions 5 and 6, whereby the overall rigidity can be increased. The large torque can be reliably transmitted to the driven side without the rubber parts 5, 6 being damaged or the like.

As described above, in the coupling according to this embodiment, when a small torque is input, a soft spring constant is obtained only by the displacement of the leaf springs 3 and 4, and when a large torque is input. Have leaf springs 3 and 4
Is deformed so as to be wound around the outer peripheral surface of the boss 1, and the rubber portions 5, 6 on the inner surface side of each of the leaf springs 3, 4 are compressed between the outer peripheral surfaces of the boss 1, so that the rubber portions 5, As a result, it is possible to obtain a high spring constant due to the action of only 6 and thus exhibit excellent damping properties against vibration generated when a small torque is input, and to increase overall rigidity when a large torque is input. As a result, it is possible to prevent the rubber portions 5 and 6 from being damaged.

In the above description, the boss 1 is connected to the drive side shaft, and the outer case 2 is connected to the driven side shaft. However, the boss 1 is connected to the driven side shaft, and the outer case 2 is connected to the driven side shaft. They may be connected.

[0024]

According to the present invention, as described above, when a small torque is input, a soft spring constant can be obtained only by the leaf spring, so that the input vibration can be reliably attenuated. Also, when a large torque is input, the leaf spring is deformed so as to wind around the outer peripheral surface of the boss, and the rubber part provided integrally with the leaf spring is compressed between the boss and the boss. Since a high spring constant can be obtained, the rigidity can be increased, and therefore, a low spring when a small torque is input, and
It has an excellent effect that both high rigidity at the time of high torque input can be satisfied.

[Brief description of the drawings]

FIG. 1 is a schematic view showing an embodiment of a coupling according to the present invention.

FIG. 2 is a sectional view of the one shown in FIG.

FIG. 3 is an explanatory diagram showing a relationship between a spring constant and a torsion angle of the one shown in FIG.

FIG. 4 is a schematic view showing a conventional coupling.

FIG. 5 is an enlarged view of the rubber bush shown in FIG. 4, and is an explanatory view showing a state of displacement in a rotation direction.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Boss 2 ... Outer case 3, 4 ... Leaf spring 5, 6 ... Rubber part 7 ... Base part 8 ... Projection part 9, 10, 23, 24 ... Hole 11 ... Flange part 12, 13 , 14, 15 ... pin 21 ... disk 22 ... bush 25 ... inner ring 26 ... rubber-like elastic body 27 ... outer ring 28 ...

Continuation of the front page (56) References JP-A-60-178693 (JP, A) JP-A-59-96459 (JP, U) JP-A-62-81725 (JP, U) JP-A-57-23426 (JP) , U) Jikken 50-28724 (JP, Y1) Jikken 51-16249 (JP, Y2)

Claims (1)

(57) [Scope of request for utility model registration] 1. A coupling for integrally connecting a drive-side shaft and a driven-side shaft to transmit a drive-side torque to a driven-side shaft, wherein the coupling comprises a drive-side shaft or a driven-side shaft. A boss (1) integrally connected to one of the shafts; and an outer case (2) integrally connected to the other shaft.
And a leaf spring (3) provided between the boss (1) and the outer case (2) and integrally connecting the two.
(4) and rubber portions (5) and (6) provided integrally with the leaf springs (3) and (4), and when the input torque is small, only the leaf springs (3) and (4) are provided. When acting, a low spring constant is obtained and the input torque is large, the leaf springs (3), (4) are deformed so as to wind around the boss (1), and the leaf springs (3), (4) When the rubber portions (5) and (6) provided integrally with the boss (1) are compressed between the boss (1), only the rubber portions (5) and (6) act to obtain a high spring constant. A coupling characterized in that it is configured to be able to be used.