JPH059553Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention is used to absorb vibrations caused by fluctuations in torque in mechanical devices that undergo torque fluctuations during rotation, such as internal combustion engines. Regarding the torsional damper used.

(Prior Art) The one shown in FIG. 4 is an example of a conventionally known torsional damper of this type, which has an inner radial portion 2, a cylindrical portion 3, and an outer radial portion 4. A hub 1 is connected to a shaft (not shown), an inner sleeve 5 having a cylindrical shape and fitted to the inner periphery of the cylindrical part 3, an outer sleeve 6 fitted to the outer periphery of the cylindrical part 3, and a rubber-like An inner elastic ring 7 made of an elastic material and coupled to the inner circumferential surface of the inner sleeve 5, an outer elastic ring 8 coupled to the outer circumferential surface of the outer sleeve 6, and an inner elastic ring having a substantially cylindrical shape. It has an inner vibrating ring 9 coupled to the inner circumferential surface of the elastic ring 7 and an outer vibrating ring 10 coupled to the outer circumferential surface of the outer elastic ring 8.

(Problems to be Solved by the Invention) In the conventional torsional damper described above, the inner elastic ring 7 When the inner vibration ring 9 breaks, there remains a risk that the inner vibration ring 9 will separate from the hub 1 and fly out.

That is, since the outer vibration ring 10 is sandwiched between the outer radial portion 4 and the main body of the machine located on the right side in the figure, even if the outer elastic ring 8 breaks, it will not be detached from the hub 1. However, since the left side of the inner vibration ring 9 is open in the figure, it separates from the hub 1 and flies out.

It is an object of the present invention to provide a torsional damper structure that can solve the above-mentioned problems and prevent the vibration ring from separating to the open side.

(Means for Solving the Problems) In consideration of the problems in the torsional damper according to the conventional technology described above, the present invention has proposed a rubber-like elastic material for the sleeve fitted to the inner periphery of the inner cylindrical part of the hub. An outward protrusion having a diameter reaching the middle of the inner and outer circumferences of the sleeve is attached to the end opposite to the open side of the inner vibrating ring that is connected via the elastic ring.

(Function) In the torsional damper with the above configuration, when the elastic ring made of a rubber-like elastic material breaks and the inner vibration ring attempts to separate from the hub side, the elastic ring attached to the end of the inner vibration ring An outwardly directed protrusion abuts the end surface of the sleeve to inhibit axial movement of the inner vibrating ring relative to the hub.

(Embodiment) In the embodiment of FIG. 1, the cylindrical part 3 of the hub 1 has an inner radial part 2, a cylindrical part 3 and an outer radial part 4 and is connected to a shaft (not shown).
At the end of the inner radial portion 2 side of the inner vibrating ring 9 connected via the inner elastic ring 7 made of a rubber-like elastic material to the inner sleeve 5 fitted with the inner sleeve 5,
An outward protrusion 11 having a diameter larger than the inner diameter of the inner sleeve 5 and smaller than the outer diameter is provided.

Either the length of the rubber portion of the inner elastic ring 7 interposed between the end surface of the inner sleeve 5 and the side surface of the outward projection 11 is set appropriately, or the joint portion of the inner elastic ring 7 and the outward projection 11 is left in a non-adhered state. By keeping the torsional damper at a desired value, the natural frequency of the torsional damper is set to a desired value.

In the embodiment shown in FIG. 2, an annular groove is provided between the end surface of the inner sleeve 5 and the outward protrusion 11, so that the natural frequency of the torsional damper is set to an appropriate value.

The embodiment of FIG. 3 does not have anything corresponding to the outer radial portion 4 in the embodiment of FIG. Similar to the inner vibrating ring 9, an inward protrusion 12 having a diameter larger than the inner diameter of the outer sleeve 6 and smaller than the outer diameter is attached to the end opposite to the open side. .

(Effect of the invention) As described above, the torsional damper of the invention releases the inner vibration ring that is connected to the sleeve fitted to the inner periphery of the cylindrical part of the hub via the elastic ring made of rubber-like elastic material. By having an outward protrusion with a diameter reaching halfway between the inner and outer circumferences of the sleeve on the end opposite to the side, it is possible to prevent the elastic ring from breaking due to repeated torque fluctuations. When the inner vibrating ring tries to separate from the hub side, the protrusion attached to the end of the inner vibrating ring comes into contact with the end surface of the sleeve and stops the inner vibrating ring from moving in the axial direction.
The danger of the vibration ring coming off or popping out, which was seen in torsional dampers using conventional technology, is effectively eliminated.

[Brief explanation of the drawing]

1, 2, and 3 are sectional views of an embodiment of the present invention, and FIG. 4 is a sectional view of an example of a torsional damper according to the prior art. DESCRIPTION OF SYMBOLS 1... Hub, 2... Inner radial part, 3... Cylindrical part, 4... Outer radial part, 5... Inner sleeve, 6... Outer sleeve, 7... Inner elastic ring, 8...Outer elastic ring, 9...Inner vibration ring, 10...Outer vibration ring, 11...External projection, 12...Inward projection.

Claims (1)

[Scope of utility model registration request] A hub 1 having a radial portion 2 and a cylindrical portion 3 and connected to the shaft, a sleeve 5 having a substantially cylindrical shape and engaging the inner circumferential surface of the cylindrical portion 3, made of a rubber-like elastic material. In a torsional damper having an elastic ring 7 coupled to the sleeve 5 and an inner vibration ring 9 arranged concentrically with the sleeve 5 and coupled to the elastic ring 7, the radial direction of the inner vibration ring 9 is A torsional damper characterized in that an outward projection 11 having a diameter reaching the middle of the inner circumferential surface and the outer circumferential surface of the sleeve 5 is attached to the end portion on the side of the portion 2.