JPS5916585Y2 - torsional damper - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a torsional damper that prevents torsional vibrations occurring in a rotating shaft such as a crankshaft of an automobile engine.

Generally, a torsional damper is provided at the end of the crankshaft of an engine in order to suppress torsional vibrations occurring in the crankshaft of an engine.

For example, a damper as shown in FIG. 1 has an outer rotating body 3 that also serves as a pulley attached to the outer periphery of an inner rotating body 1 fixed to a rotating shaft (not shown) via an elastic body 2 such as rubber. There is one.

Such torsional dampers are usually manufactured by a rubber vulcanization method using an adhesive.

However, this method uses a vulcanizing press and a mold to apply heat and pressure and hold it for a certain period of time, causing the vulcanizing agent in the pre-mixed rubber to react and converting the rubber into a plastic body. It includes a vulcanization process that transforms it into an elastic body and firmly bonds the metal and rubber.

This vulcanization step is the most important step in this manufacturing method, and because temperature, time, and pressure are important check items, manufacturing is extremely difficult and requires a large number of man-hours.

Another method is to vulcanize only the rubber and then press-fit it into the gap between the two rotating bodies with an appropriate amount of tightness.In this case, although it is possible to press-fit with the use of lubricant, etc. There was also a limit to the size of the seam allowance, and the elasticity of the rubber was not strong enough to transmit torque.

Furthermore, since rubber has the property of shrinking when vulcanized, it acts in the direction of peeling off the adhesive and vulcanized wall surface.Therefore, it is necessary to use a rubber material that is strong in tension. It became necessary to upgrade the

The purpose of this invention was proposed in view of the above drawbacks.
It is an object of the present invention to provide a torsional damper that is easy to assemble and can sufficiently exhibit torque transmission and vibration absorption by effectively utilizing the elastic force of rubber.

In this invention, an outer rotating body is disposed on the outer periphery of an inner rotating body fixed to a rotating shaft with a gap in between, and a ring is press-fitted into this gap to pre-compress the rubber body inserted in the gap. It is something to give.

Next, embodiments of the present invention will be described in detail with reference to the drawings.

2 to 6 show the first embodiment of the present invention,
Reference numeral 11 denotes an inner rotating body fixed to the end of the crankshaft (not shown), and 12 denotes an outer rotating body that also serves as a pulley and is disposed around the outer periphery of the inner rotating body 11 with a gap 13 interposed therebetween.

14 is a vulcanized rubber body fitted into the gap 13;
The outer diameter of the rubber body 14 before being fitted into the gap 13 is smaller than the inner diameter of the outer rotating body 12.

Reference numeral 15 denotes a shoulder portion continuous in the circumferential direction provided at the axial end of the outer periphery of the inner rotating body 11.

Furthermore, in the present invention, the ring 16 is press-fitted onto the outer periphery of the inner rotating body 11 from the end opposite to the axial end where the shoulder portion 15 is provided, and the rubber body 14 is attached to the inner periphery of the outer rotating body 12. It is pressed against the surface.

Also, the tightness between the inner rotating body 11 and the ring 16 is the same as that of the rubber body 14.
Although the size of the ring 16 is large enough to prevent the ring 16 from being pulled out due to the repulsive force in the axial direction, in order to prevent the ring 16 from pulling out and to make torque transmission more effective,
As shown in FIG. 4, there are knurling grooves 17 on the outer peripheral portion of the inner rotating body 11 that the rubber body 14 contacts, and the outer rotating body 1
Several grooves 18 are provided on the inner periphery of the rotor 2 to increase the frictional force between the two rotating bodies and the rubber body 14.

FIG. 5 shows the state immediately after inserting the rubber body 14 having an outer diameter smaller than the inner diameter of the outer rotating body 12 into the gap 13 and starting press-fitting the ring 16 onto the outer periphery of the inner rotating body 11. Similarly, the ring 16 is shown in a state when the press-fitting is completed.

As a result, the rubber body 14 is compressed in the axial direction between the ring 16 and the shoulder 15, and therefore tends to expand in the radial direction.

Therefore, the rubber body 14 is pressed against the outer circumferential surface of the inner rotating body 11 and the inner circumferential surface of the outer rotating body 12, and the elastic force acting on both rotating bodies becomes a frictional force when the crankshaft is driven, and torque is transmitted.
As a torsional damper, it functions to prevent torsional vibration.

FIG. 7 shows a second embodiment of the present invention, in which instead of providing the shoulder portion 15 in the first embodiment on the outer periphery of the inner rotating body 11, rings 16 are press-fitted from both sides. There is no difference in operation and effect from the first embodiment.

FIG. 8 shows a third embodiment, in which the press-fitted ring 1
A part of the end face of the inner rotating body 11 is caulked to further prevent the inner rotating member 6 from being pulled out to the outside due to the repulsive force of the rubber.

Since the present invention is constructed as described above, the vulcanization process of metal and rubber, which requires complicated manufacturing control as in the past, is eliminated, and only the rubber is vulcanized, making it possible to manufacture large metal parts. There is no need to carry it into the vulcanization process, making manufacturing easier.

In addition, there is no need to use adhesive to bond the rubber to the rotating body as in the past, and there is no need for the rubber material to be resistant to tension. This provides flexibility in material selection.

Furthermore, in the past, when press-fitting rubber into a rotating body, it was attempted to improve the torque transmission and vibration absorption functions by increasing the frictional force as much as possible. There was naturally a limit to how much it could be used to improve its performance.

However, as a result of press-fitting the ring as in the present invention, the ease of assembly is improved, sufficient elasticity of the rubber can be obtained, and the press-fitting depth of the ring can be varied. The spring constant can also be varied.

In the above embodiment, the ring 16 was press-fitted into the inner rotating body 11 and the shoulder portion 15 was provided on the inner rotating body 11, but even if the ring 16 was press-fitted into the inner peripheral surface of the outer rotating body 12, It goes without saying that the shoulder portion 15 may be provided, and the combination thereof is free.

In short, any material may be used as long as it prevents the rubber body from expanding in the axial direction.

Furthermore, as shown in FIGS. 3 and 4 in the first embodiment, knurled grooves 17 were provided on the outer periphery of the inner rotating body 11, and grooves 18 were provided on the inner circumferential surface of the outer rotating body 12, but the opposite was true. Alternatively, both sides may have knurled grooves or ■grooves, and the arrangement is free.

As described above, according to the present invention, it is possible to achieve high assemblability and to suppress torsional vibration of the rotating shaft.

[Brief explanation of drawings]

Figure 1 is a sectional view showing a conventional torsional damper, Figure 2 is a sectional view showing a conventional torsional damper.
The figure is a sectional view of a torsional damper showing the first embodiment of the present invention, FIG. 3 is a side view of the inner rotating body in the first embodiment, FIG. 4 is a radial sectional view of the outer rotating body, and FIG. The figure is a partially enlarged cross-sectional view of the torsional damper showing the start of press-fitting of the ring in the first embodiment, FIG. FIG. 8 is a partially enlarged sectional view of the torsional damper showing the third embodiment. 11...Inner rotating body, 12...Outer rotating body, 13...Gap, 14...Rubber body, 15...Shoulder part , 16...Ring.

Claims (1)

[Claims for Utility Model Registration] ■ An inner rotating body that is concentrically fixed to the rotating body, an outer rotating body that is disposed on the outer periphery of the inner rotating body with a gap, and a rubber that is fitted into the gap. The damper is characterized in that the rubber body is pressed against the inner rotating body and the outer rotating body by press-fitting a ring in the axial direction of the gap and applying precompression to the rubber body. ■ The ring is press-fitted into the gap from the negative side in the axial direction, and a means for preventing the rubber body from moving in the axial direction is installed on the other side in the axial direction. The torsional damper according to claim 1, which is a registered utility model, characterized in that the torsional damper is provided integrally around the inside of the body. (2) The torsional damper according to claim 1, wherein a ring is press-fitted into the gap from both sides in the axial direction.