JPH0842592A - Twist cushioning disc - Google Patents

Abstract

PURPOSE:To provide a twist cushioning disc to provide twist characteristics in a multistage through simple structure. CONSTITUTION:Holding parts 53c and 54c in a semicircular protrusion shape in cross section are formed at sheets 53 and 54. When a torsion member 5 is started to bend and contract, the sheets 53 and 54 are rotated in the peripheral direction of a disc toward plates 2 and 3 and a hub 1 with a flange.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a torsion buffer disc, which transmits an input from a plate to a hub with a flange through a torsion member while buffering the input with a torsion member. Used.

[0002]

2. Description of the Related Art Heretofore, as a torsion buffer disk of this type, the one disclosed in Japanese Utility Model Publication No. 3-121230 has been known. This is one in which the flanged hub and the flange of the flanged hub are elastically connected in the disk circumferential direction via various types of torsion members arranged around the hub of the flanged hub so as to face each other. The input from the plate side is transmitted to the hub side with the flange through the torsion member while buffering the bending contraction of the torsion member. In this conventional device, the torsion member is flexed and contracted in order according to the torque value input for each type thereof, whereby the predetermined twisting characteristic corresponding to the input torque value is made multi-stage.

[0003]

However, in the above-mentioned conventional device, various torsion members are required to make the twisting characteristics multi-staged, so that the number of parts increases and the structure becomes complicated. Therefore, the torsion buffer disk has caused various problems such as increase in weight and cost.

Therefore, it is a technical object of the present invention to provide a torsion buffer disk having a simple structure and multi-stage torsion characteristics.

[0005]

In order to solve the above-mentioned technical problems, the technical means taken in the present invention is arranged between a torsion member and a plate and a hub with a flange, and one side surface of the torsion member is A cross-section half which is in contact with the disk circumferential end face and whose other side surface is in contact with the flange of the plate and the flanged hub, and which is fitted and held on the flange of the flanged hub and the plate on the other side surface. A circular protrusion-shaped holding portion is formed, and a seat is provided which is rotatable around the holding portion with respect to the flanged hub and the plate in the disc circumferential direction.

[0006]

According to the above technical means, the seat rotates in the disc circumferential direction with respect to the plate and the flange of the flanged hub when the torsion member begins to flex and contract. Therefore, by this rotation, the twisting characteristic by the rotation of the seat is obtained before the twisting characteristic by the flexural contraction of the torsion member. Therefore, the twisting characteristics can be multistaged without using various types of torsion members, the number of parts can be reduced, and the structure can be simplified.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIGS. 1 and 2 show a clutch disc of a friction clutch disposed between an engine of an automobile and a transmission, which is used as a drive shaft on the outer peripheral portion of a disc plate 2 of a torsion buffer disc A which will be described later. A plurality of corrugated leaf springs 8 fixed on both sides by ribets 7 that have facings 6A, 6B which can be sandwiched by spring force between an engine flywheel (not shown) and a pressure plate (not shown). Is fixed by a rivet 9. A transmission imprint shaft (not shown) as an output shaft is spline-fitted to the hub 11 of the flanged hub 1 of the torsion buffer disk A.

As shown in FIGS. 1 to 3, the torsion buffer disk A comprises a hub 11 and a flanged hub 1 having a flange 12 extending from the outer circumference in the disk radial direction at the center thereof. 11 includes a disc plate 2 and a sub plate 3, which are arranged so as to sandwich the flange 12 and face each other with respect to the flange 12 and are connected by a plurality of pins 4, a hub 1 with a flange, a disc plate 2 and a sub plate 3. It is composed of a plurality of torsion members 5 that are elastically connected in the disk circumferential direction. The torsion member 5 includes a large-diameter coil spring 51 and a small-diameter coil spring 52 housed in the large-diameter coil spring 51 and arranged in parallel. still,
The torsion member 5 may be one coil spring, or may be rubber or the like as long as it is an elastic body. The large-diameter coil spring 51 has a coarse winding portion 51a with a coarse winding pitch in the vicinity of both winding ends (on both sides in the disk circumferential direction) on the center side of both mounting portions 51c which are both winding ends. An intermediate portion between 51a is a densely wound portion 51b having a winding pitch denser than that of the coarsely wound portion 51a. The small-diameter coil spring 52 has an equal winding pitch, but the winding pitch may be different similarly to the large-diameter coil spring 51. In this way, the large-diameter coil spring 5 having different winding pitches
No. 1 has a winding pitch different from each other near the both winding ends as a rough winding portion 51b, so that the load imbalance can be obtained by assembling the flanged hub 1, the disc plate 2 and the sub plate 3 from either direction. Does not occur. Therefore, the direction of assembling the torsion member 5 with respect to the flanged hub 1, the disc plate 2 and the sub-plate 3 is eliminated, and the number of assembling steps and erroneous assembling are reduced.

At predetermined portions of the disc plate 2 and the sub-plate 3, a plurality of windows 21 extending in the disc circumferential direction,
31 are formed to face each other. The flange 12 of the flanged hub 1 is formed with a plurality of notches 13 that face the windows 21 and 31. This opposing window 21, 3
1 and the notch 13 make up one set, and the window 2 that becomes this set
The torsion members 5 are arranged in each of the groups 1, 31 and the notch 13 while being flexed and contracted by a predetermined amount, whereby the torsion members 5 are assembled to the flanged hub 1, the disc plate 2 and the sub plate 3. Further, seats 53 and 54, which will be described later, are disposed between the disk circumferential end surface of the torsion member 5 and the windows 21 and 31 and the disk circumferential end surface of the notch 13 so as to be sandwiched by the reaction force of the torsion member 5. The disk circumferential end surfaces of the windows 21 and 31 and the disk circumferential end surface of the notch 13 contact the disk circumferential end surface of the torsion member 5 via seats 53 and 54 described later.

One side surface 53a, 54a of the seat 53, 54 which abuts the end surface of the torsion member 5 in the disk circumferential direction.
Is the side surface of the mounting portion 51c (the torsion member 5) which is the smooth surface of the outer periphery of the large-diameter coil spring 51.
Side surface of the mounting portion 51c (the disk of the torsion member 5) which is a smooth surface of the small-diameter coil spring 52 and which is a stepped surface with respect to the smooth surface of the outer circumference. Abut on the circumferential end face). Further, the other side surfaces 53b and 54b of the seats 53 and 54 which come into contact with the disk circumferential end surface of the torsion member 5 contact the disk circumferential end surface of the notch 13 of the flange 12 of the flanged hub 1 near the disk axial center thereof. They contact each other and contact the disk circumferential end surfaces of the windows 21 and 31 of the disk plate 2 and the sub-plate 3 on both outer sides in the disk axial direction.

The other side surfaces 53b, 5 of the seats 53, 54
On the inner side of the disc 4b in the disc radial direction, holding portions 53c and 54c having a semicircular cross section that extend in the disc axial direction are integrally formed so as to project from the other side faces 53b and 54b. Also, the other side surfaces 53b, 5 of the sheets 53, 54
A pair of guide portions 53d, 54d extending in the disc radial direction parallel to the side faces of the flange 12 of the flanged hub 1 are provided on the outer side of the disc radial direction 4b of the other side faces 53b, 54b.
It is integrally formed so as to project with respect to. Holding portions 53c, 54c of the seats 53, 54 are provided on the cutouts 13 of the flange 12 of the flanged hub 1 and the disk circumferential end faces of the windows 21, 31 of the disk plate 2 and the sub-plate 3.
Semicircular recesses 13a, 21a, 31a having the same cross-sectional shape as the holding portions 53c, 54c are formed so as to face the holding portions 53c, 54c.
21a, 31a, so that the seat 5
3, 54 are held by the flanged hub 1, the disc plate 2 and the sub plate 3 in the disc circumferential direction and the radial direction. The flange 12 of the flanged hub 1 is sandwiched between a pair of guide portions 53d and 54d, whereby the sheets 53 and 54 are guided by the flanged hub 1, the disc plate 2 and the sub plate 3 in the disc axial direction.

The windows 21 and 31 and the notch 13 are fan-shaped, and the both sides of the disk in the circumferential direction are the seat 5.
The other side surfaces 53b and 54b of the shafts 3 and 54 are inclined by a predetermined angle B with respect to the smooth surface, and the seats 53 and 54 are formed by the holding portions 53c and 54c and the recessed portions 13a, 21a and 31a. It is rotatable in the disc circumferential direction with respect to the flange 12 of the hub 1 with a flange, the disc plate 2 and the sub plate 3 with the holding to the disc plate 2 and the sub plate 3 as the center. This sheet 5
The rotation of 3, 54 is guided by the guide portions 53d, 54d.

Next, the operation will be described.

When the clutch is connected, basically, the torque from the engine, which is input to the disc plate 2 and the sub plate 3 through the facings 6A and 6B and the corrugated leaf spring 8, is attached to the flange through the torsion member 5. It is transmitted to the hub 1 and output from the flanged hub 1 to the transmission.
At this time, the flanged hub 1 and the disc plate 2 and the sub plate 3 rotate relative to each other with the twisting characteristic shown in FIG. 4 while flexing and contracting the torsion member 5 in accordance with the input torque value. A buffering action is exerted on the torque transmission from the plate 2 and the sub plate 3 to the flanged hub 1. The torsion buffer disk A includes a first thrust plate 10a, a sub-plate 3, and a flanged hub arranged between the disk plate 2 and the flange 12 of the flanged hub 1 around the hub 11 of the flanged hub 1. A hysteresis mechanism 10 configured by a second thrust plate 10b and a disc spring 10c arranged around the hub 11 of the flanged hub 1 is provided between the flanged hub 1 and the disc plate 1. 2 and the sub plate 3 have hysteresis in the torsional characteristics when they rotate relative to each other, and a damping action is exerted on torque transmission from the disc plate 2 and the sub plate 3 to the flanged hub 1.

Although the flexural contraction of the torsion member 5 is performed according to the torque value, the twist angle region C shown in FIG.
Then, the torsion member 5 is flexed and contracted to some extent, so that the sheets 53 and 54 rotate by a predetermined angle B, whereby the torsional characteristic K1 shown in FIG. 5 is obtained, and the torque value based on the torsional characteristic K1 is obtained. Transmits torque. or,
In the twist angle region D shown in FIG. 5, the coarse winding portion 51a, the close winding portion 51b, and the small diameter coil spring 52 of the large diameter coil spring 51 of the torsion member 5 are flexed and contracted. The twist characteristic K2 shown is obtained, and torque transmission of a torque value based on the twist characteristic 2 is performed. Further, in the twist angle region E shown in FIG. 5, the tightly wound portion 51c of the large-diameter coil spring 51 of the torsion member 5 flexes and contracts, and the torsion member 5 is stretched.
Only the roughly wound portion 51b of the large-diameter coil spring 51 and the small-diameter coil spring 51 are flexed and contracted, whereby the torsion characteristic K3 shown in FIG. 5 is obtained, and the torque transmission of the torque value based on the torsion characteristic 3 is performed. To do.

As described above, when the torsion member 5 starts to flex and contract, the sheets 53 and 54 move toward the disk plate 2, the sub plate 3 and the flange 1 of the flanged hub 1.
It rotates in the disc circumferential direction with respect to 2. Therefore, due to this rotation, the torsion characteristic due to the rotation of the seat 5 is obtained before the torsion characteristic due to the flexural contraction of the torsion member 5.

Therefore, the twisting characteristic is multi-staged (two or more stages) without using various kinds of torsion members 5, the number of parts is reduced, and the structure is simplified.

[0019]

According to the present invention, a holding portion having a semicircular projecting shape in cross section is formed on a seat, and when the torsion member begins to flex and contract, the seat is directed to the plate and the flange of the flanged hub in the disc circumferential direction. Since the seat is rotated, the twisting characteristic due to the rotation of the seat can be obtained before the twisting characteristic due to the flexural contraction of the torsion member. As a result, the twisting characteristics can be multistaged without using various types of torsion members, the number of parts can be reduced, and the structure can be simplified.

[Brief description of drawings]

FIG. 1 is a plan view of a clutch disc to which a torsion buffer disc according to the present invention is applied.

FIG. 2 is a sectional view taken along line FF of FIG. 1;

FIG. 3 is a plan view showing a main part of the torsion buffer disk according to the present invention.

FIG. 4 is a twist characteristic diagram according to the present invention.

[Explanation of symbols]

 A torsion buffer disk 1 hub with flange 2 disk plate (plate) 3 sub-plate (plate) 5 torsion member 53, 54 sheet 53c, 54c holding part

Claims (1)

[Claims] 1. A flanged hub and a plate arranged around the hub of the flanged hub so as to face the flange of the flanged hub are elastically coupled in the disk circumferential direction via a torsion member. In the torsion buffer disk, one side surface is disposed between the torsion member and the plate and the flanged hub, and one side surface contacts the disk circumferential end surface of the torsion member and the other side surface is the plate and the flanged hub. Of the hub with flange and a holding portion having a semicircular cross-section that is fitted and held in the plate and is held on the other side surface of the flange with respect to the hub with flange and the plate. A torsion buffer disk having a seat rotatable about the holding portion in the disk circumferential direction.