JPH06249289A - Torque variation absorbing device - Google Patents

Abstract

PURPOSE:To absorb expansion and contraction of a ring due to temperature change so as to lengthen the life of the ring itself by providing a slit on the ring provided between an inertia body on the driving side and an elastic body. CONSTITUTION:When rotation of an engine is transmitted from a crankshaft 11 to an inertia body 2 on the driving side and the inertia body 2 on the driving side is rotated in the arrow mark A direction, and relative rotation is generated between the inertia body on the driving side and an inertia body 3 on the driven side, the hole 4c of a spring sheet 4b is fitted to the projection 3c of a driven plate 3b, and hence torque variation is absorbed by means of a spring 4 while repeating compression and expansion. During rotation, the spring 4 is deflected on the outer circumferential side by centrifugal force, but it is not directly contacted with an outer ring part 5 by means of a ring 6, and hence friction between the spring 4 and the outer ring part 5 is reduced. Because the ring 6 is provided with a slit 6a on one part on the circumference, even if the ring 6 is contracted due to temperature change, it is absorbed so as not to generate unnecessary stress in the ring 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The invention disclosed in this specification includes:
It can be applied to a torque fluctuation absorbing device used for a drive shaft system of a vehicle.

[0002]

2. Description of the Related Art A vehicle torque fluctuation absorbing device disclosed in Japanese Patent Laid-Open No. 63-13919 is known as a prior art. The above-mentioned prior art is shown in FIGS.
As described in (1), the drive-side inertial body, which is installed between the crankshaft of the engine and the clutch mechanism, is rotatable with respect to the drive-side inertial body, the drive-side inertial body, and the driven-side inertial body. An outer spring portion is provided between the body and an elastic body, and the drive-side inertial body is provided with an outer ring portion that receives the spring biased toward the outer peripheral side by a centrifugal force during rotation of the torque fluctuation absorber. A steel band is installed between the spring and the outer ring portion to prevent wear of the spring.

In the above-mentioned prior art, the steel band is mainly used by applying a lubricating oil such as grease. For example, the viscosity of the lubricating oil is lowered by a high temperature, the oil film is broken, or the steel band is used. However, if the oil film breaks due to high pressure on its surface, or if the lubricating oil deteriorates, the lubrication will not be successful and the spring will slide and wear against the steel band, shortening the life of the device. Was thought. Although this problem does not seriously impair the function of the spring, it is not preferable from the viewpoint of extending the life of the device. Therefore, in place of the steel band, it is conceivable to use a wear-resistant material that does not use lubricating oil, for example, a resin material, but the resin material generally expands due to temperature change as compared with metal, Large contraction.

In this respect, in the structure such as the steel band, since the position on the circumference is restricted by the notch provided in the outer ring portion at the end thereof, the resin temperature is reduced by the decrease of the outside air temperature. When the material contracts, there is a rare problem that unnecessary stress is generated in the resin material and the life of the resin material is shortened.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide a torque fluctuation absorbing device having a long life of elastic members and other parts.

[0006]

In order to solve the above problems, according to the present invention, a drive-side inertia member mounted on a crankshaft of a vehicle engine and a clutch mechanism that rotates with respect to the drive-side inertia member. A torque fluctuation absorber that includes a driven-side inertial body that transmits a driving force by being locked with an elastic body interposed between the driving-side inertial body and the driven-side inertial body. An outer ring portion is provided on the outer peripheral side of one of the elastic bodies of the driven inertia body.
A torque fluctuation absorbing device is characterized in that a ring formed of a wear resistant material is further interposed between the elastic body and the outer ring portion, and a ring having a slit is interposed.

[0007]

As described above, according to the means described in the present invention, since the ring provided between the drive side inertial body and the elastic body is provided with the slit, it is not fixed circumferentially. The expansion and contraction of the ring due to the change in temperature are absorbed by the slit, so that unnecessary stress does not occur in the ring.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A description will be given below with reference to the drawings showing the present invention.

FIG. 1 is a front view of the torque fluctuation absorbing apparatus of the present invention, FIG. 2 is a sectional view taken along line 2-2 of FIG. 1, and FIG. 3 is a sectional view taken along line 3-3 of FIG. In the figure, a torque fluctuation absorbing device 1 includes a drive-side inertial body 2, a driven-side inertial body 3, and a spring 4 which is an elastic body installed between the drive-side inertial body 2 and the driven-side inertial body 3. There is. The drive-side inertial body 2 is coupled to the crankshaft 11 of the engine, while the driven-side inertial body 3 is equipped with a clutch mechanism (not shown) to transmit the driving force from the engine to the transmission through the clutch mechanism. Both ends of the spring 4 are held by the recesses 2a of the drive-side inertial body 2 via spring seats 4a and 4b, respectively. On the other hand, the driven inertial body 3 is provided with a torque limiting mechanism 3a for avoiding excessive compression of the spring 4 when an excessive torque is applied to the torque fluctuation absorber 1. The driven plate 3b, which is one member of the torque limiting mechanism 3a, includes a flange portion 3d having a protrusion 3c, and when the torque fluctuation is absorbed, the protrusion 3c causes the spring seat 4b to intervene as described later. Energize the spring 4.

The spring 4 is provided on the drive side inertia body 2.
An outer ring portion 5 is provided in a circumferential shape on the outer peripheral portion of the, and a ring 6 made of a wear-resistant material is arranged so as to contact the outer ring portion 5, and the spring 4 directly drives the drive. It prevents contact with the side inertial body 2. The ring 6 has a substantially circular shape in FIG. 1 and is provided with a slit 6a at its end. Further, an arc 6b is provided on the inner peripheral side in the cross section.

Next, the operation of the above torque fluctuation absorbing device 1 will be described. When the engine is started and its rotation is transmitted from the crankshaft 11 to the drive-side inertial body 2, the drive-side inertial body 2 rotates in the direction of arrow A in FIG. 1, and the drive-side inertial body 2 and the driven-side inertial body are rotated. When relative rotation occurs with the body 3, the hole 4c of the spring seat 4b is fitted into the projection 3c of the driven plate 3b, so that the spring 4 is driven through the spring seats 4a and 4b. It is compressed between the side inertial body 2 and the driven side inertial body 3. By the compression of the spring 4, the rotational torque is transmitted from the drive-side inertial body 2 to the driven-side inertial body 3. Here, the spring 4 absorbs the torque fluctuation generated while repeating compression and extension.

While the torque fluctuation absorbing device 1 is rotating, the spring 4 is bent toward the outer peripheral side by the centrifugal force due to the rotation, but the spring 6 and the spring seat 4b are moved by the ring 6 to the driving side inertial body 2. Since there is no direct contact with the outer ring portion 5 provided on the outer peripheral portion of the spring 4, wear of the spring 4 and the outer ring portion 5 is reduced.

Since the ring 6 is provided with a slit 6a at one location on its circumference, even if the ring 6 expands or contracts due to a change in temperature of the torque fluctuation absorber 1, the slit 6a prevents the ring 6 from expanding or contracting. Since it is absorbed, unnecessary stress is not generated in the ring 6.

FIG. 4 shows a second embodiment of the present invention in which the ring 16 has a rectangular cross section. In addition, in FIG. 5, a ring 26 is a third embodiment of the present invention.
As shown in the figure, make the cross section of the central part concave compared to both sides,
The spring 4 is received by the shoulders on both sides.
Further, FIG. 6 shows a fourth embodiment in which the spring seat 4b has a shape in which the ring 36 escapes.

In the above embodiment, the ring 6 is provided so as to be in contact with the inner peripheral side of the outer ring portion 5 provided on the drive side inertial body 2, but the ring 6 and the outer ring portion 5 are on the driven side inertial body 3 side. May be provided.

[0016]

According to the torque fluctuation absorbing apparatus described in the present invention, it is possible to prevent wear due to expansion and contraction of the spring, so that it is possible to provide a torque fluctuation absorbing apparatus having a long life.

Further, since the ring is provided with the slits, unnecessary stress is not generated in the ring due to expansion and contraction of the ring due to temperature change, so that the life of the ring itself can be extended.

Further, since it is not necessary to use the lubricating oil, the wear resistance of the ring does not become unstable due to factors such as the oil film running out of the lubricating oil, and a sealing material for sealing the lubricating oil is used. Therefore, the cost of the device can be reduced. Further, since it is not necessary to fix the ring, the assembly is easy.

[Brief description of drawings]

FIG. 1 is a front view of a torque fluctuation absorber according to the present invention.

2 is a sectional view taken along line 2-2 of FIG.

3 is a sectional view taken along line 3-3 of FIG.

FIG. 4 is a diagram showing a second embodiment of the torque fluctuation absorbing apparatus of the present invention.

FIG. 5 is a diagram showing a third embodiment of the torque fluctuation absorbing apparatus of the present invention.

FIG. 6 is a diagram showing a fourth embodiment of the torque fluctuation absorbing apparatus of the present invention.

[Explanation of symbols]

1 Torque fluctuation absorber 2 Driven inertial body 3
Driven inertial body 4 Spring 5 Outer ring part 6 Ring 6a Slit 11 Crankshaft

Claims (1)

[Claims] 1. A drive-side inertial body mounted on a crankshaft of a vehicle engine, and a driven-side inertial body that rotates with respect to the drive-side inertial body and transmits a driving force by engaging with a clutch mechanism. A torque fluctuation absorbing device including an elastic body interposed between the drive-side inertial body and the driven-side inertial body, wherein one of the drive-side inertial body and the driven-side inertial body has an outer peripheral side. A torque fluctuation absorbing device, wherein an outer ring portion is provided, and a ring formed of a wear-resistant material is provided between the elastic body and the outer ring portion, and a ring having a slit is interposed.