JPH0694077A - Torsional damper - Google Patents

Abstract

PURPOSE:To provide a torsional damper capable of bringing the expected damping performance into full play even if the accuracy of finishing in a disk is not heightened, and having the damping performance stabilized by way of keeping an interval between the disk and a inertia mass constant. CONSTITUTION:This torsional damper is featured that a disk 10 being situated in a viscous fluid L is separated at a specified position in the radial direction, forming a nearly toroidal outer ring part 11 at the radial outside, and this outer ring part 11 is connected to a disk body part 12 left over through an elastic member 13, while each spacer 7 holding an interval between the outer ring part 11 and an inertia mass 4 is clamped to both axial surfaces of the outer ring part 11 or an inner surface of the inertia mass 4 being opposed to the outer ring part 11.

Description

Detailed Description of the Invention

[0001]

This invention relates to a crankshaft,
A disk fixed to the rotary shaft side of a drive shaft, propeller shaft, etc. is surrounded by an inertial mass connected to the rotary shaft side via an elastic body, and a viscous disk is surrounded by the elastic body and the inertial mass. The present invention relates to a torsional damper containing a fluid.

[0002]

2. Description of the Related Art As a conventional torsional damper containing a viscous fluid, as shown in FIG. 7, an extending portion 2A is formed on a hub 2 fixed to a rotary shaft 1 such as a crankshaft.
One side 4A of the inertial mass 4 is attached to one axial side surface of the extending portion 2A via the elastic body 3, the disc 100 is fixed to the hub 2, and the inertia attached to the ring body 5 via the elastic body 6 is applied. The other 4B of the mass 4 is superposed on the one 4B by fixing the ring body 5 to the hub 2. A viscous fluid L is enclosed around the disk 100 in the inertial mass 4. Disk 10
0 is formed of one thin metal plate, and has a high rigidity.

[0003]

Inertial mass 4 and disk 10
A damping force is generated by relative rotation with respect to 0, and the damping characteristics are stabilized by keeping the distance between the disc 100 and the inertial mass 4 4A, 4B constant. However, if the machining accuracy of the disc 100 is poor and there is a warp or the like, the distance between the disc 100 and the inertial mass 4 is not constant,
If a spacer is forcedly interposed between the disc 100 and one side 4A of the inertial mass 4 and between the disc 100 and the other side 4B of the inertial mass 4 in order to keep a constant distance, the spacer and the disc 100 or the inertial mass 4 are forced to intervene. Sliding with No. 4 became difficult, and there was a possibility that the desired damping performance could not be exhibited. Further, there has been a problem that the manufacturing cost becomes high in order to make the processing accuracy of the disc 100 extremely high.

Therefore, according to the present invention, the desired damping performance can be exhibited without increasing the machining accuracy of the disc, and the damping characteristic is stabilized by keeping the distance between the disc and the inertial mass constant. The purpose is to provide a torsion damper.

[0005]

In order to achieve the above-mentioned object, the present invention separates a disk located in a viscous fluid at a predetermined radial position to form a substantially donut-shaped outer annular portion radially outward. Then, the outer annular portion and the remaining disc body portion are connected by an elastic member, and the space between the outer annular portion and the inertial mass is maintained on both axial surfaces of the outer annular portion or the inner surface of the inertial mass facing the outer annular portion. The spacer is fixed.

[0006]

In the present invention, since the disc main body portion fixed to the rotary shaft side of the disc and the outer annular portion on the side where the spacer is fixed or contacted are connected by the elastic member, the disc machining accuracy is improved. Even if it is not raised, the spacer and the outer annular portion or the inertial mass slide smoothly, and the distance between the outer annular portion and the inertial mass is kept constant.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the drawings.

In the first embodiment shown in FIG. 1, a torsional damper similar to that shown in FIG. 7 is used, and the disc 10 is cut off at a predetermined position in the radial direction, and the outer annular portion 11 is substantially donut-shaped outward in the radial direction. The outer annular portion 11 is formed on the disk main body portion 12 near the center separated from the outer annular portion 11 and the elastic member 13
It is connected. A spacer 7 for holding a space between the outer annular portion 11 and the inertial mass 4 is fixed to both axial surfaces of the outer annular portion 11 or the inner surface of the one side 4A and the other side 4B of the inertial mass 4 facing the outer annular portion 11. is there. For details of the disk 10,
As shown in FIGS. 2 and 3, an insertion hole 14 for inserting the rotating shaft 1 is formed at the center of the disc body portion 12, and the disc body portion 12 and the outer annular portion 11 are elastic. It is connected by members 13.

In the second embodiment shown in FIG. 4, concave and convex portions 11A and 12A corresponding to the inner peripheral edge of the outer annular portion 11 and the outer peripheral edge of the disc body 12 which form the disc 10 are formed,
An elastic material 13 connects between the uneven portions 11A and 12A.

In the third embodiment shown in FIG. 5, the disc body 12 of the disc 10 is directly fixed to the rotary shaft 1, and the disc body 1
2 shows an inertial mass 4 attached to the elastic body 3 via the elastic bodies 3 and 6, in other words, an example in which the hub 2 is not used. The outer annular portion 11 and the disc body 12 are connected by an elastic member 13, and a spacer 7 is interposed between the outer annular portion 11 and the inertial mass 4.

In another embodiment of the invention shown in FIG. 6, the disc 1
0 is not divided into the outer ring portion 11 and the disc body portion 12, and the disc 1
A plurality of holes 15 are formed around the outer peripheral edge of 0 in the circumferential direction. Slits 16 and 17 are formed in the holes 15 along the radial direction toward the center and toward the outer periphery, but such slits 16 and 17 may not be formed. By forming these holes 15, the circular plate 10
Since the portion near the outer peripheral edge has flexibility, the disc 10 having rigidity is less likely to warp.

[0012]

As described above, according to the present invention, the disc is divided into the outer annular portion and the disc main body, and the both are connected by the elastic member, so that the machining accuracy of the disc itself is not increased. However, by interposing the spacer between the outer annular portion and the inertial mass, sliding between the spacer and the outer annular portion or the inertial mass is smoothly performed, and desired damping performance can be exhibited. Further, since the distance between the outer annular portion and the inertial mass is kept constant, the damping characteristic becomes constant. Also, in the case where a plurality of holes are formed near the outer peripheral edge of the disc, the flexibility near the outer peripheral edge of the disc is increased, and the disc is less likely to warp, and the spacer and the disc or the inertia Sliding with the mass is performed smoothly, and the distance between the disk and the inertial mass is kept constant. Whether the disc is composed of the outer annular portion and the disc body or the disc having a plurality of holes near the outer peripheral edge thereof, the disc is easily deformed in the axial direction. Therefore, it is possible to prevent the sliding portion of the spacer from being impeded by an unreasonable force, so that sufficient damping performance can be secured. Further, in the case where the irregularities of the outer annular portion and the disc body are connected to each other by the elastic member, the rigidity in the rotational direction is high and a certain damping performance can be secured.

[Brief description of drawings]

FIG. 1 is a sectional view showing a main part of a first embodiment.

FIG. 2 is a plan view of a disc.

3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a plan view of a disc showing a second embodiment.

FIG. 5 is a sectional view showing a third embodiment.

FIG. 6 is a plan view of a disk showing another embodiment of the invention.

FIG. 7 is a sectional view showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 rotating shaft 3,6 elastic body 4 inertial mass 7 spacer 10 disk 11 outer ring part 12 disk body part 13 elastic member 15 hole L viscous fluid

Claims (3)

[Claims] 1. A disk fixed to the rotary shaft side of a crankshaft or the like is surrounded by an inertia mass connected to the rotary shaft side via an elastic body, and the circumference of the disk surrounded by the elastic body and the inertia mass. In a torsional damper with a viscous fluid enclosed in it, the disk located in the viscous fluid is separated at a predetermined radial position to form a donut-shaped outer annular portion on the outside in the radial direction. An elastic member is connected to the plate main body, and a spacer for holding a space between the outer annular portion and the inertial mass is fixed to both axial surfaces of the outer annular portion or an inner surface of the inertial mass facing the outer annular portion. Torsional damper. 2. The torsional damper according to claim 1, wherein the outer peripheral edge of the disc body and the inner peripheral edge of the outer annular portion are respectively formed with concave and convex portions corresponding to each other. 3. A disk fixed to the rotary shaft side of a crankshaft or the like is surrounded by an inertia mass connected to the rotary shaft side via an elastic body, and the circumference of the disk surrounded by the elastic body and the inertia mass. In a torsional damper in which viscous fluid is enclosed in, a plurality of holes are formed in the circumferential direction toward the outer peripheral edge of the disk located in the viscous fluid, and on both axial sides or both sides of the outer peripheral edge of the disk. A torsion damper characterized in that a spacer for holding the space between the disk and the inertial mass is fixed to the inner surface of the opposing inertial mass.