JPH05180268A - Manufacture of torsional damper - Google Patents

Abstract

PURPOSE:To prevent rubber from separating from the outer peripheral surface of a hub and from the inner peripheral surface of a vibration ring as tensile stress is generated inside the rubber as the rubber contracts in a cooling process after vulcanization. CONSTITUTION:This is a torsional damper constituted by connecting a vibration ring 2 on the outer peripheral side of a hub 1 through rubber 3 and by vulcanizing and adhering the rubber 3 on an outer peripheral surface 4 of the hub 1 and on an inner peripheral surface 5 of the vibration ring 2. Additionally, the outer peripheral surface 4 of the hub 1 is formed in a roughly conical shape, and the inner peripheral surface 5 of the vibration ring 2 is formed in a roughly conical shape inclined in the same direction as the outer peripheral surface 4 of the hub 1. This vibration ring 2 is arranged at a position shifted to the small diametrical side of a conical surface against the hub 1. In this state, the rubber 3 is vulcanized and adhered on the outer peripheral surface of the hub 1 and the inner peripheral surface 5 of the vibration ring 2, and when the rubber 3 contracts after vulcanization, the hub 1 and the vibration ring 2 are relatively moved in a direction parallel with a central axis.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a torsional damper which absorbs and damps vibrations generated in various rotary drive systems such as crankshafts of automobile engines.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 3, a vibration ring b is connected to an outer peripheral side of an annular hub a via an annular rubber c, and the rubber c is connected to the outer peripheral surface of the hub a and the vibrating ring b. A torsional damper is known which is vulcanized and adhered to the inner peripheral surface. The hub a and the vibrating ring b are formed of a predetermined metal, and the outer peripheral surface of the hub a and the vibrating ring b are formed.
The inner peripheral surface of each is formed in a cylindrical shape parallel to the central axis. When manufacturing the above torsion damper,
The hub a and the vibration ring b, which are finished as parts in advance, are positioned in the cavity of the mold for rubber molding, and the rubber c is vulcanized and simultaneously vulcanized to the outer peripheral surface of the hub a and the inner peripheral surface of the vibration ring b. It is glued. When the hub a and the vibrating ring b are positioned in the cavity, they are positioned so that their positions are the same as after molding.

[0003]

The above conventional manufacturing method has the following problems. That is, the rubber c contracts in the cooling process after vulcanization (hereinafter, also referred to as molding contraction), and tensile stress is generated inside the rubber c, so that the rubber c does not contact the outer peripheral surface of the hub a and the vibration ring b. It easily peeled off from the peripheral surface and was poor in durability. Further, in order to eliminate such a problem, a sleeve made of sheet metal (not shown) is interposed between the rubber c and the vibration ring b, that is, after the rubber c is vulcanized and bonded between the sleeve and the hub a, the sleeve is formed. There is a method of removing the tensile stress of the rubber c caused by the molding shrinkage by squeezing the diameter and fitting the vibrating ring b on the outer peripheral side of the sleeve, but in this case, the sleeve is required, There is a problem that the manufacturing cost rises.

[0004]

SUMMARY OF THE INVENTION In view of the above points, the present invention has been devised to solve the problems found in the above-mentioned prior art. In a method of manufacturing a torsional damper, wherein a vibration ring is connected via rubber, and the rubber is vulcanized and bonded to the outer peripheral surface of the hub and the inner peripheral surface of the vibration ring, the outer peripheral surface of the hub is formed into a substantially conical surface. The inner peripheral surface of the vibrating ring is formed in a substantially conical surface inclined in the same direction as the outer peripheral surface of the hub, and the vibrating ring is displaced toward the smaller diameter side of the conical surface with respect to the hub. A method for manufacturing a torsional damper is provided, in which the rubber is placed in a position and the rubber is vulcanized and adhered to the outer peripheral surface of the hub and the inner peripheral surface of the vibrating ring in this state.

[0005]

When the outer peripheral surface of the hub and the inner peripheral surface of the vibrating ring are formed into a substantially conical surface inclined in the same direction, when the hub and the vibrating ring are relatively displaced in the direction parallel to the central axis, the outer peripheral surface of the hub and the vibrating ring are moved. The distance between the inner peripheral surfaces of the vibrating ring changes. Therefore, even if the rubber vulcanized and bonded to the outer peripheral surface and the inner peripheral surface is molded and contracted, the hub and the vibration ring relatively move in the direction parallel to the central axis to reduce the distance between the outer peripheral surface and the inner peripheral surface. It is possible to remove the tensile stress due to molding shrinkage. In order to remove the tensile stress based on this action, the manufacturing method of the present invention arranges the vibrating ring at a position shifted to the small diameter side of the conical surface with respect to the hub, and in this state, puts the rubber on the outer peripheral surface of the hub and the vibrating ring. I decided to vulcanize and adhere to the inner surface of the. It should be noted that the removal or relaxation of the tensile stress due to the above-mentioned action becomes more remarkable as the inclination angle of the conical surface becomes larger. However, when the vibrating ring also functions as a pulley, this inclination angle should be set appropriately considering the load from the pulley. Set to.

[0006]

Embodiments of the present invention will now be described with reference to the drawings.

FIG. 1 shows a cross section of a torsional damper manufactured by the manufacturing method according to this embodiment. Reference numeral 1 denotes a cast iron hub, the outer peripheral surface 4 of which is formed into a substantially conical surface shape. A pair of pulleys 2 is connected to the outer peripheral side of the hub 1 via a rubber 3 and is formed by drawing a sheet metal.
It is a vibrating ring composed of a and 2b, and its inner peripheral surface 5 is formed into a substantially conical surface inclined in the same direction as the outer peripheral surface 4 of the hub 1. The outer peripheral surface 4 of the hub 1 and the inner peripheral surface 5 of the vibration ring 2 are substantially parallel to each other, and the rubber 3 is vulcanized and bonded to the outer peripheral surface 4 and the inner peripheral surface 5. The torsion damper is manufactured by the following procedure. That is, the hub 1 and the vibration ring 2 (provided that
The pulley 2b on the right side of the drawing can be attached later) in the cavity of the mold. At this time, as shown by the chain line in FIG. The rubber 3 is vulcanized and molded at the same time by locating at a position shifted to the right side in the figure), and at the same time, vulcanized and bonded to the outer peripheral surface 4 of the hub 1 and the inner peripheral surface 5 of the vibration ring 2. After molding, when the molded product consisting of the hub 1, the rubber 3 and the vibration ring 2 is taken out from the mold, the rubber 3 is contracted and the hub 1 and the vibration ring 2 are pulled toward each other. As shown, the hub 1 and the vibrating ring 2 relatively move in the direction parallel to the central axis 0 and actually approach each other, whereby the tensile stress generated in the rubber 3 can be removed. How much the hub 1 and the vibration ring 2 are displaced when positioning the hub 1 and the vibration ring 2 in the cavity is determined in consideration of the molding shrinkage amount of the rubber 3.

[0008]

The present invention has the following effects. That is,
The outer peripheral surface of the hub is formed into a substantially conical surface, the inner peripheral surface of the vibration ring is formed into a substantially conical surface that is inclined in the same direction as the outer peripheral surface of the hub, and the vibration ring is formed on the smaller diameter side of the conical surface with respect to the hub. Since the rubber is placed on the outer side of the hub and the inner peripheral surface of the vibration ring is vulcanized and adhered in this state, the hub and the vibration ring are centered even if the rubber is molded and contracted after vulcanization. The tensile stress due to molding shrinkage can be removed by moving relatively in the direction parallel to the axis, which prevents the rubber from peeling off from the outer peripheral surface of the hub and the inner peripheral surface of the vibrating ring to improve durability. be able to. In addition, it does not require a sleeve as in the past and does not require a tensile stress removing process by squeezing this sleeve.
It is easy to manufacture and the manufacturing cost can be reduced.

[Brief description of drawings]

FIG. 1 is a half sectional view of a torsional damper manufactured by a manufacturing method according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of the main part of the torsion damper.

FIG. 3 is a half sectional view of a conventional torsional damper.

[Explanation of symbols]

 1 hub 2 vibrating rings 2a, 2b pulley 3 rubber 4 outer peripheral surface 5 inner peripheral surface

Claims (1)

[Claims] 1. A vibrating ring 2 is connected to an outer peripheral side of a hub 1 via a rubber 3, and the rubber 3 is vulcanized and bonded to an outer peripheral surface 4 of the hub 1 and an inner peripheral surface 5 of the vibrating ring 2. In the method of manufacturing a torsion damper, the outer peripheral surface 4 of the hub 1 is formed into a substantially conical surface shape, and the inner peripheral surface 5 of the vibrating ring 2 is formed into a substantially conical shape inclining in the same direction as the outer peripheral surface 4 of the hub 1. It is formed in a planar shape, and the vibrating ring 2 is arranged at a position displaced from the hub 1 on the smaller diameter side of the conical surface. In this state, the rubber 3 is placed on the outer peripheral surface 4 of the hub 1 and the vibrating ring 2. A method of manufacturing a torsional damper, which comprises vulcanizing and adhering to the inner peripheral surface 5.