JPH0444896Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a clutch disk, and more particularly to an improvement in a rotational direction shock absorber disposed on the clutch disk.

[Conventional technology]

Generally, when power is transmitted from the output shaft of the engine to the transmission via the clutch mechanism, fluctuations in the transmitted torque due to engagement and disconnection of the clutch mechanism are absorbed by a rotational direction shock absorber provided on the clutch disk. There is.

FIGS. 5 and 6 are a sectional view and a plan view of essential parts of a clutch disk 20 equipped with a conventional rotational damping device 10, respectively.

This rotational direction shock absorber 10 includes a clutch hub 1
2, disk plate 14 and sub plate 1
6, the clutch hub 12 and the disc plate 1 that occur when the clutch is connected
Cushion spring 1
This is absorbed by the deformation of 8.

By the way, as mentioned above, since the conventional rotational direction shock absorber 10 is composed only of elastic bodies such as the cushion spring 18 whose spring constant changes linearly, its torsional characteristics are as shown in the graph of FIG. It exhibits linear and curved characteristics, and therefore, when there is a sudden torque fluctuation, or when a large transmission torque T is impulsively applied to the disc plate 14 or the clutch hub 12,
The torsionally rigid portions (straight lines 22, 24) are suddenly reached, which may cause rattling noise in the transmission or lowering of the clutch operating section.

In addition, in FIGS. 5 and 6, reference numeral 26 is a facing, and 28, 30, and 32 are a disc plate 14, a clutch hub 12, and a sub-plate 16, respectively.
A hole formed at a predetermined position on the circumferential surface of the hole 28,
A cushion spring 18 is housed and held within the shafts 30 and 32.

[Purpose of invention]

In view of the above-mentioned circumstances, this idea was developed to create a clutch disc that absorbs as much of the torque fluctuation as possible even when a small transmission torque, sudden torque fluctuation, or large transmission torque is applied as an impact. The purpose is to provide

[Structure of the idea]

In order to achieve the above-mentioned purpose, this invention:
Along the circumferential direction of the clutch hub and the disc plate, a first rotational shock absorber made of a coil spring, a pressing member whose cross-sectional area increases from the tip to the rear end, and a pressing member that is pressed against the tip of the pressing member. A second rotational direction shock absorber having a disc-shaped leaf spring and a support member that supports the peripheral edge of the disc-shaped leaf spring is alternately interposed, and is added to either the clutch hub or the disc plate. The generated driving force is transmitted to the other through the first and second rotational direction shock absorbers.

〔Example〕

An embodiment of the clutch disk according to this invention will be described in detail below.

Figure 1 shows clutch disk 4 related to this invention.
0, and the same parts as in FIGS. 5 and 6 are denoted by the same reference numerals.

This clutch disk 40 includes a clutch hub 12, a disk plate 14, and a sub-plate 1.
6, a first rotational direction shock absorber 10 consisting of a coil spring 18 similar to the conventional one, and a second rotational direction shock absorber 50 to be described later.
are arranged alternately.

This second rotational direction shock absorber 50 is shown in FIG.
As shown in FIG. 2, which is an AA cross-sectional view, holes 28, 30,
It is housed and held within 32. The second rotational direction shock absorber 50 also includes a pressing member 52 having a hemispherical tip 52a, a disc-shaped plate spring 54 that is in close contact with the tip 52a of the pressing member 52, and supporting the plate spring 54. The support member 56 is also comprised of a support member 56. Note that a hemispherical recess 56a is formed on the surface of the support member 56.

Next, the function of the second rotational direction buffer device 50 will be explained, along with the operation of the clutch disk 40 according to the present invention.

FIG. 3 is a sectional view showing a state in which torque fluctuation occurs in the disc plate 14 of the clutch disc 40, and the same parts as in FIG. 2 are designated by the same reference numerals.

The torque T transmitted to the disc plate 14 is transmitted to the disc-shaped leaf spring 54 via the pressing member 52 of the second rotational damping device 50 housed in the holes 28 and 32.

On the other hand, this disk-shaped leaf spring 54 is pressed and curved by the tip 52a of the pressing member 52, but because the tip 52a has a hemispherical shape, that is, a shape whose cross-sectional area increases from the tip to the rear end. , the contact area of the disc-shaped leaf spring 54 is
It increases according to the amount of deformation. Therefore, as the pressing member 52 presses the spring 54 with a stronger pressing force, the contact area between the pressing member 52 and the spring 54 increases, so the pressing force is dispersed, and the amount of deformation of the spring 54 increases. becomes progressively smaller. That is, the disk-shaped leaf spring 54 of the second rotational direction shock absorber 50 described above rapidly (nonlinearly) increases its spring constant in accordance with the amount of deformation thereof.

According to the clutch disk 40 having such a structure, the spring characteristics of the leaf spring 54 of the second rotational direction shock absorber 50 change nonlinearly and gradually.
The change in the spring load due to the second rotational direction shock absorber 10 is smoothly connected to the change in the spring load due to the second rotational direction shock absorber 50 as shown in the graph of FIG. 4 showing the torsional characteristics of the clutch disk 40 described above. It will be communicated.

Therefore, according to the graph showing the torsional characteristics of the clutch disk 40 shown in FIG. The first rotational damping device 10, which uses a coil spring 18 whose spring constant changes linearly as shown in FIG. As shown in the graph shown in FIG. 2, the torsional characteristics of the clutch disk change smoothly from the straight line portion 60 to the curved portion 61, so that sudden torque fluctuations can be smoothly absorbed. Furthermore, even when a large transmission torque is applied impulsively, the disk-shaped leaf spring 54 whose spring constant changes non-linearly, as shown by the curved line 61 of the graph in FIG.
The second rotational direction shock absorber 50 using the above functions mainly to gradually increase the torsional rigidity and smoothly absorb the impactful torque fluctuation.

[Effect of idea]

As explained above, in this invention, along the circumferential direction of the clutch hub and the disc plate,
A first rotational direction shock absorber made of a coil spring, a pressing member whose cross-sectional area increases from the tip to the rear end, a disk-shaped leaf spring that presses against the tip of the pressing member, and the disk-shaped plate. Since the second rotational shock absorber having a support member supporting the peripheral edge of the spring is interposed alternately, when a small transmission torque is applied, the first rotational shock absorber mainly consists of a coil spring. works to smoothly absorb torque fluctuations, and even when sudden torque fluctuations are applied, the torsional characteristics of the clutch disc change smoothly.
The sudden torque fluctuation can be absorbed smoothly. In addition, when a large transmission torque is applied as an impact, the second rotational direction shock absorber mainly works to absorb the torque fluctuation. Even when torque is applied, the variation in torque is absorbed as much as possible, thereby preventing teeth rattling of the transmission and significantly improving the durability of the transmission and the operational feel of the clutch.

[Brief explanation of the drawing]

Fig. 1 is a plan view of the main parts of the clutch disc according to this invention, Figs. 2 and 3 are sectional views along AA of Fig. 1, and Fig. 4 shows the torsional characteristics of the clutch disc according to the invention. Graph shown, 5th
6 and 6 are a sectional view and a plan view thereof showing a conventional clutch disk, and FIG. 7 is a graph showing torsional characteristics of the conventional clutch disk. 10...First rotational direction shock absorber, 12...Clutch hub, 14...Disc plate, 18...
...Coil spring, 40...Clutch disk, 50...Second rotational direction shock absorber, 52...
Pressing member, 52a...Tip, 54...Spring, 56
...Supporting member.

Claims (1)

[Claims for Utility Model Registration] A first rotational shock absorber 10 made of a coil spring 18, a pressing member 52 whose cross-sectional area increases from the tip to the rear end, and a pressing member 52 that is pressed against the tip of the pressing member 52. A second rotational direction shock absorber 50 having a disc-shaped leaf spring 54 and a support member 56 that supports the peripheral edge of the disc-shaped leaf spring 54 is installed along the circumferential direction of the clutch hub 12 and the disc plate 14. The clutch hub 12 and the disc plate 14 are interposed alternately.
The driving force applied to either one of the first
and a second rotational direction damping device 10, 50 to transmit the torque to the other one.