JPH054594Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to an improvement in a torsional damper that is attached to various rotating shaft systems, such as the crankshaft of an automobile, to absorb and damp vibrations generated in the shaft system.

[Prior Art] As an example of this type of torsional damper, as shown in FIG.
A fitting type in which a vibration ring 2 is arranged concentrically around the outer circumference of the hub 1 and an elastic body 4 made of rubber material is press-fitted from one side in the axial direction into an annular space 3 formed between the hub 1 and the vibration ring 2. things are known. An annular peak 5 is formed approximately at the center of the outer diameter surface 1a of the hub 1, and the peak 5 is formed on the inner diameter surface 2a of the vibration ring 2.
An annular trough 6 is formed opposite to the elastic body 4 to prevent the elastic body 4 from coming off or the hub 1 and the vibration ring 2 being displaced in the axial direction by bending the elastic body 4 to a certain thickness. A kind of stopper is constructed to prevent this.

[Problem that the invention attempts to solve]

The torsional damper configured as described above uses the vibration ring 2 to constitute a predetermined inertial mass, and utilizes the elasticity of the elastic body 4 to absorb vibrations (mainly torsional vibrations) generated in the rotating shaft system to which the hub 1 is fitted. ), but when the elastic body 4 is press-fitted into the annular space 3 between the hub 1 and the vibration ring 2 during manufacturing and assembly, the first half of the elastic body 4 in the press-fitting direction is connected to the mountain portion 5. Since the elastic body 4 is forced to pass through the annular bent portion formed by the trough 6, the inner diameter side and the outer diameter side of the first half of the elastic body 4 are bent under different conditions when passing through, and as a result, The elastic body 4 is twisted in such a way that some parts contract and some parts expand, and the elastic body 4 is press-fitted in an uneven state, creating sparse parts and dense parts. It has a defect that has been reported to cause.

[Means for solving problems]

In view of the above points, the present invention is designed to uniformly press fit an elastic body over the entire length into an annular space having a bent portion in which annular peaks and valleys are arranged opposite each other as described above. In order to achieve this purpose, a torsional damper is developed in which a vibration ring is arranged concentrically around the outer circumference of a hub, and an elastic body made of rubber is press-fitted into the annular space formed between the hub and the vibration ring. A first annular ridge is formed on the outer diameter surface of the hub, and a first annular trough opposite to the first annular ridge is formed on the inner diameter surface of the vibration ring to fill the annular space. A first bent portion swells in the outer diameter direction, and a second bent portion is formed on the outer diameter surface of the hub.
a second annular ridge portion opposing the second annular trough portion is formed on the inner diameter surface of the vibrating ring to form a second bent portion that bulges in the inner diameter direction in the annular space; and said first and second
The bent portions of the annular space are arranged in the axial direction, and the shapes of the two portions are set symmetrically in the radial direction with respect to the opening at the axial end of the annular space.

[Effect]

In other words, the torsional damper of the present invention is made up of two radially symmetrical bent portions, a first and a second bent portion, arranged in the axial direction. It is characterized in that the twist is canceled out and disappears when passing through the other bent portion.

〔Example〕

Next, one embodiment of the present invention will be described with reference to the drawings.

As shown in FIG. 1, a vibration ring 2 is arranged concentrically around the outer circumference of a hub 1 having an annular shape.
A cylindrical elastic body 4 made of rubber is press-fitted into an annular space 3 formed between the vibrating ring 2 and the vibrating ring 2 .

A first annular ridge portion 8 is formed on the outer diameter surface 1a of the hub 1, and a first annular valley portion 9 is formed on the inner diameter surface 2a of the vibration ring 2 opposite to the first annular ridge portion 8. , a first bent portion 7 is formed in the annular space 3 and bulges in the outer diameter direction. Also hub 1
A second annular trough 11 is formed on the outer diameter surface 1a of the vibration ring 2, and a second annular ridge 12 is formed on the inner diameter surface 2a of the vibration ring 2 opposite to the second annular trough 11. A second bent portion 10 is formed within the annular space 3 and bulges in the inner diameter direction.

The first and second bent portions 7, 10 are axially aligned with each other and each other in the annular space 3.
They are set to have the same shape and size and are symmetrical in the radial direction about the opening 3a at the axial end.

When the elastic body 4 is press-fitted into the annular space 3 between the hub 1 and the vibration ring 2 from the direction of the arrow, the elastic body 4 first passes through the first bent portion 7 located on the left side in the figure, and then However, this twist is canceled out when the elastic body 4 subsequently passes through the second bent portion 10, and as a result, the elastic body 4 forms a straight annular space (not shown) having no bent portion. ) is press-fitted uniformly over the entire length. The same applies when press-fitting from the right side in the figure.

[Effect of idea]

As explained above, in the torsional damper of the present invention, the annular space into which the elastic body is press-fitted is provided with two bent portions that are radially symmetrical about the opening at the axial end of the annular space. This eliminates the twisting of the elastic body that sometimes occurs, prevents local stress concentration, and improves durability. It also prevents the vibration ring from swinging during operation to ensure smooth rotational movement.

[Brief explanation of drawings]

FIG. 1 is a half-cut sectional view of a torsional damper according to an embodiment of the present invention, and FIG. 2 is a half-cut sectional view of a torsional damper according to a conventional example. DESCRIPTION OF SYMBOLS 1... Hub, 1a... Outer diameter surface, 2... Vibration ring, 2a... Inner diameter surface, 3... Annular space, 4... Elastic body, 7... First bending portion, 8... First annular peak part, 9...first annular valley part, 10...second bent part, 11...second annular valley part, 12...second
ring-shaped mountain area.

Claims (1)

[Scope of utility model registration request] In the torsional damper, a vibration ring 2 is arranged concentrically around the outer circumference of a hub 1, and an elastic body 4 made of rubber is press-fitted into an annular space 3 formed between the hub 1 and the vibration ring 2. A first annular peak 8 is formed on the outer diameter surface 1a of the hub 1, and a first annular peak 8 is formed on the inner diameter surface 2a of the vibration ring 2.
A first annular trough 9 is formed opposite to the annular space 3 to constitute a first bent portion 7 that bulges in the outer radial direction, and a second annular trough 11 is formed on the outer radial surface 1a of the hub 1. A second annular groove 11 is formed on the inner diameter surface 2a of the vibration ring 2, and a second
A second bent portion 10 is formed in the annular space 3 by forming an annular peak portion 12 bulging in the inner diameter direction, and the first and second bent portions 7 and 10 are aligned in the axial direction, and both portions 7 , 10 are set symmetrically in the radial direction with respect to the opening 3a at the axial end of the annular space 3.