JPS5918176Y2 - clutch disk - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a clutch disc with multi-stage torsional characteristics.

Generally, a clutch disc has a plurality of rectangular window holes 3 extending in the circumferential direction in a flange portion 2 of a spline hub 1, as shown in FIG. Rectangular window holes 7 and 8 are also formed in the clutch plate 5 and retaining plate 6, which sandwich the two, at positions opposite to the window hole 3, and a torsion spring 9 having the same shape and characteristics is fitted into the overlapping window hole portion. .

However, when one type of coil spring is used as the torsion spring 9, the relationship between the torsion angle and the transmitted torque becomes linear, and the torsional vibration damping performance tends to be insufficient, especially in the initial stage of torque transmission.

Conventionally, as a countermeasure for this, for example, one (or parent and child) soft coil spring or rubber (
(rubber), and springs or rubbers with different free lengths were inserted into other spring window holes to change the rising angle, thereby producing two-stage motion torsional characteristics.

However, in that case, the dimensions of the spring window hole in the spline hub flange or the spring window hole in the plate must be made into two or three types, which has the disadvantage of complicating the structure and impairing the workability of assembling the spring. .

Furthermore, especially when rubbers are combined, it is difficult to reduce the spring constant of the rubber beyond a certain level, and therefore it is difficult to make the characteristic showing the relationship between the torsion angle and the transmitted torque have a smooth rise.

In that case, there was also the drawback that the hysteresis torque at the initial stage of torque transmission was too high due to the internal friction of the rubber.

In this invention, all the dimensions of the spring window holes are made the same, and the same composite unit is inserted into each window hole, in which a torsion rubber with a large spring constant and two types of coil springs with a small spring constant are combined in series. A multistage structure that has low rigidity and low hysteresis torque at the initial stage of torque transmission (low torque range) in the stage, and high rigidity and high hysteresis torque at the high torque range such as the final stage. It is designed to provide rigidity-multistage hysteresis characteristics, and one embodiment is shown in FIG.

That is, the composite unit 21 in FIG. 2 has sheets 22 (
metal), an intermediate thick disc-shaped torsion rubber 23,
It is composed of sheets 24 on both sides thereof and coil springs 25 and 26 arranged between the sheets 22 and 24.

The spring constant of the coil spring 25 is small, the spring constant of the coil spring 26 is medium, and the spring constant of the torsion rubber 23 is large.

In FIG. 2, the protrusion 27 of the torsion rubber 23 fits tightly into the protrusion 28 of the seat 24, and is integrated with the protrusion 28 by baking or other means.

The sheet 22 has a protrusion 29 at the center of the end surface.

Coil springs 25°26
By press-contacting the inside of the unit 21, the entire unit 21 can be assembled into a block shape that is not dispersed.

When the spring seams 22.22 are pushed toward each other, the coil spring 25 with a small spring constant is first bent (first stage), and after the protrusion 29 on the right side of the figure collides with the protrusion 28 on the right side, mainly After the coil spring 26 with a slightly larger spring constant is bent (second step), and the protrusion 28 on the left side of the figure collides with the protrusion 29 on the left side, only the torsion rubber 23 with a larger spring constant is bent (third step). (This is happening.

As explained above, according to the present invention, all torsion springs are composed of the same composite unit in which a torsion rubber with a large spring constant and two types of coil springs with a small spring constant are combined in series. Since a stopper is provided to regulate the amount of deflection of the coil spring, (a) the window hole dimensions of the spline hub flange, clutch plate, and retaining plate can be made the same for each, making it easy to process them; Become.

Since it is only necessary to attach a torsion spring composite unit of the same shape to each window hole, assembly work efficiency is greatly improved.

(b) At the beginning of torque transmission in the first stage, the coil spring can provide low rigidity and low hysteresis torque, and in the high torque range such as the final stage, the torsion rubber provides high rigidity and high torque. Can provide hysteresis torque.

In other words, when using a coil spring, unlike when using only rubber, the torsional rigidity at the initial stage of torque transmission can be made sufficiently low, and since the internal friction of the coil spring is extremely small, the hysteresis torque in the low torque range is sufficient. becomes smaller.

On the other hand, when the torsion rubber is compressed, a fairly large hysteresis torque is generated due to the internal friction of the rubber, so when combined with the friction between the flange, clutch, and both retaining plates, a large hysteresis torque can be obtained in the high torque range. .

Therefore, various vibrations including torsional vibrations at the initial stage of torque transmission can be absorbed extremely effectively.

(C) Window edge side sheet 22 and rubber 23 side sheet 2
4 is provided with protrusions 29 and 28 at the center of the opposing surface to prevent the coil springs 25 and 26 from being fully compressed and falling off.
The intermediate torsion rubber 2 prevents buckling and damage of the springs 25 and 26 due to full compression, and prevents the coil springs 25 and 26 from falling out of the window holes due to centrifugal force.
Displacement of the clutch disk 3 in the radial direction is suppressed by coil springs 25 and 26 on both sides.

This avoids the problem of the torsion rubber 23 contacting and sliding against the edge of the window hole and disturbing the hysteresis torque during the torsional vibration absorption process.

(d) Since the sheets 22 and 24 on both sides of the coil springs 25 and 26 are both made of metal, they can be sufficiently supported even if the contact pressure with the coil springs 25 and 26 increases, and the coil springs Damage to the torsion rubber 23 can be more reliably prevented than in the case where 25 and 26 are directly applied to the torsion rubber 23 or burned.

Even if the protrusions 28 and 29 frequently collide during the torsional vibration absorption process, wear and tear on the rubber can be eliminated compared to when the rubber and metal are in direct contact, increasing durability.

Since the sheet 24 and the rubber 23 are in close contact, the rubber 23
A compressive load can be applied to the entire rubber 2
3 is prevented, and the energy absorption capacity of the rubber 23 is fully utilized to make the composite unit compact.

(e) Since the spring constant of the coil spring 25 is small, the spring constant of the coil spring 26 is medium, and the spring constant of the torsion rubber 23 is large, the torque gradually increases as the torsion angle increases due to one composite unit 21. 3
The torsional properties of the stages can be adjusted, and one type of composite unit can cover most applications.

In other words, versatility increases.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a general latch disk, and FIG. 2 is a sectional view of a torsion spring composite unit that can be used in place of the torsion spring in FIG.

Claims (1)

[Scope of utility model registration request] A plurality of window holes are formed in the flange portion of the spline hub, and window holes are also formed in positions opposite to the window holes in a clutch plate and a retaining plate that are integrally connected to the friction facing on the outer periphery and sandwich the flange portion. Next, the dimensions of the window holes in the flange, clutch, and retaining plates were made the same, and the same torsion spring composite unit was fitted into all the overlapping window holes.
The above composite unit is arranged in series with the metal sheets at both ends that contact the window edge, the torsion rubber between them, the metal sheets that closely contact the torsion rubber from both sides, and the rubber side sheet between the window edge side sheet and the rubber side sheet. It consists of a pair of coil springs, and a protrusion is provided at the center of the opposing surfaces of the window edge side and rubber side sheets to prevent the coil springs from being completely compressed and falling off.The spring constant of one coil spring is small, while the other A clutch disc characterized by having a coil spring with a medium spring constant and a torsion rubber with a large spring constant.