JPH0420097B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a damper disk that can absorb fluctuating torque generated by an internal combustion engine and average the torque transmitted to the driven side.

Conventional damper disks of this type are of the compression type in which both sides of the elastic body are fixed on the driving side and the driven side, and the amount of compression itself is the amount of torsion, as shown by the curve A in Figure 14. I couldn't get a large twist angle. Therefore, at high speeds, this conventional compression type was able to absorb torque fluctuations, but at low speeds it was not possible to absorb torque fluctuations, and when the drive source was an internal combustion engine, abnormal noises (muffled noise, differential noise, etc.) caused by torque fluctuations occurred. It was not possible to absorb sounds, etc.

The object of the present invention is to obtain a damper disk that can absorb noise and vibration by increasing the torsion angle and increasing the hysteresis.

In order to achieve this object, the present invention includes a driven member connected to an output shaft, and a driving member disposed coaxially with the driven member on both sides of the driven member in the axial direction and connected to the input side. between the driving member and the driven member, one of the driving member and the driven member is formed into a shape having a substantially circular surface, and the other is formed into a shape having a substantially polygonal surface, and between the driving member and the driven member. a plurality of rollers arranged in the same direction, elastically allowing relative rotational displacement of the two members, and elastically rolling in the circumferential direction between the inner circumferential surface of the driving member and the outer circumferential surface of the driven member; It is made up of an elastic block body.

The polygonal surface and/or the circular surface has an uneven shape in the axial direction or the circumferential direction.

Therefore, when the driving member on the input side rotates at a low speed, the driving member is twisted, and the elastic block body rolls while being sandwiched between the inner peripheral surface of the driving member and the outer peripheral surface of the driven member on the output shaft side. It receives compression and transmits rotation to the output shaft. In this case, the torsional characteristics of the elastic block body are initially low in rigidity and hysteresis, but
The rigidity gradually increases, the torsion angle increases, and the hysteresis also increases. Nonlinear characteristics that are effective against vibration and noise on the driven side are obtained, and vibration and noise can be absorbed. The number of points is small, and by changing the material and hardness of the elastic block body, the angle of the outer periphery of the hub, etc., the torsional characteristics can be easily changed. By making it non-uniform in the axial direction, it is possible to prevent the block from moving and stabilize the torsional characteristics.

Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1 and 2 show a first embodiment, in which numeral 1 denotes a hub that is a driven member that is fixed to an output shaft (not shown) and rotates; It is a polygon (regular hexagon). Both sides of the hub 1 are connected to the hub 1 from the outer circumferential side.
a disk plate 3 which is a driving member concentric with the
A space 5 formed by the hub 1, the disk plate 3, and the sub-plate 4 is sandwiched between the sub-plates 4 fixed to the disk plate 3.
An elastic block body 7 is disposed so as to be in contact with the two outer circumferential surfaces of the hub 1 and the circular inner circumferential surface 6 of the sub-plate 4, and the space 5 has a radial interval that is non-uniform in the circumferential direction. ing.

In this embodiment, this elastic block body 7 is the hub 1.
It is made of rubber and has a cylindrical shape, with the surfaces in contact with the outer periphery 2 and the circular inner peripheral surface of the sub-plate 4 being flat and the corners smoothly chamfered. 8 is a facing, and 9 is a disk spring. Note that, as an example, an input shaft of a transmission can be applied to the rotating shaft fixed to the hub 1.

Now, when the disk plate 3 on the input side rotates at high speed, the hub 1, elastic block body 7, sub-plate 4, and disk plate 3 rotate as one, and there is no problem of twisting.

When the disk plate 3 rotates at a low speed, the disk plate 3 and the sub-plate 4 are twisted and the elastic block body 7 is rolled and compressed, so that a nonlinear characteristic as shown by curve B in FIG. 14 can be obtained. The elastic block body 7 has low rigidity and small hysteresis at the beginning of twisting, but as the rigidity gradually increases, the torsion angle increases as shown in Fig. 14B, and the hysteresis also increases, absorbing vibration and noise. I can do it.

3 to 6 show second to fifth embodiments in which the structure of the hub or elastic block body is different from that in FIG. 1,
Fig. 3 shows a structure in which a hole is made in the center of the elastic block body 7 in the axial direction to further reduce the initial rigidity, Fig. 5 shows a structure in which the elastic block body 7 is made into a hollow pipe-shaped spring, and Figs. In FIG. 6, the two outer peripheral surfaces of the hub 1 have a gently concave straight surface and a large arc surface at the corner to change the torsional characteristics, but there is no difference in operation and effect from the case in FIG. 1.

FIG. 7 shows a sixth embodiment, in which two outer peripheral surfaces of the hub 1 are convex outward to prevent the elastic block body 7 from moving in the axial direction. This is a seventh embodiment in which the circular inner circumferential surface 6 of the block is inwardly convex in the axial direction, and in both cases, the radial intervals of the spaces in which the elastic block bodies 7 are disposed are non-uniform in the axial direction. It is formed. Further, FIGS. 9 and 10 both show eighth and ninth embodiments in which the elastic block body 7 is spherical, and FIG.
is a concave surface in the axial direction, and the characteristic curve when the block body is made into a sphere is shown by the dotted line C in FIG.

11 and 12 show a tenth embodiment, in which a sub-plate 4a is fixed to the hub 1 with a pin 10 to serve as a driven member, and the circular inner circumferential surface 6 of the sub-plate 4a and a driving member. disk plate 3
The elastic block body 7 is arranged so as to be in contact with each surface of the polygonal outer circumferential surface 2a formed by the polygonal shape.

Also, in FIG. 13, the sub-plate 4b, which is a driven member fixed to the hub 1 as in FIG. 12, has a structure having a petal-shaped inner circumferential surface 6a that is concavely curved outward in the circumferential direction, and is a driving member. The outer circumferential surface 2b of the disk plate 3 is circular, and the radial intervals of the spaces in which the elastic block bodies 7 are disposed are made non-uniform in the circumferential direction.

[Brief explanation of drawings]

FIG. 1 is a partially sectional front view showing only half of a damper disk according to an embodiment of the present invention, FIG. 2 is a sectional view of the same side, and FIGS. Front views showing only a quarter of the damper disk in the second to fifth embodiments of the invention, FIGS. 7 and 8,
9, 10, and 11 are side sectional views showing the sixth to tenth embodiments of the damper disk of the present invention, respectively, and FIG. 12 is a partially sectional front view of FIG. FIG. 13 is a front sectional view of a main part of an embodiment different from FIG. 12, and FIG. 14 is a diagram showing the relationship between twist angle and twist torque. Explanation of the main parts of the figure: 1... hub, 2... outer periphery, 3... disk plate, 4... sub-plate, 5... space, 6... circular inner peripheral surface, 7... elastic block body.

Claims (1)

[Scope of Claims] 1. A driven member connected to an output shaft, and a driving member disposed coaxially with the driven member on both axial sides of the driven member and connected to the input side, One of the driving member and the driven member is formed into a shape having a substantially circular surface, and the other is formed into a shape having a substantially polygonal surface, and is disposed between the driving member and the driven member, a plurality of elastic block bodies that elastically allow relative rotational displacement of the two members and elastically roll in the circumferential direction between the inner circumferential surface of the driving member and the outer circumferential surface of the driven member; A damper disc characterized by being arranged with. 2. The damper according to claim 1, wherein the outer circumferential surface of the driven member that contacts the elastic block body radially outwardly is formed into a curved surface that protrudes radially outwardly in the axial direction. disc. 3. The damper disk according to claim 1, wherein the inner circumferential surface of the drive member that contacts the elastic block body in the radial direction is formed into a curved surface that protrudes radially inward in the axial direction. .