JPS6330133A - Manufacture of torsional damper - Google Patents

Abstract

PURPOSE:To obviate the difficulty for a manufacture, and also, to improve the quality by positioning an elastic ring so as to be inserted and held between opposed peripheral surfaces of a hub which has been brought to press preforming to a small diameter and a vibration ring, and thereafter, executing diameter expanding press forming by using a segmental die from the inside peripheral side of the hub. CONSTITUTION:A hub 1 made of a metallic plate, which has been brought to press preforming to a smaller diameter D1 than a final product size D2, and a vibration ring 3 having a recessed peripheral line 5 on the inside peripheral surface are placed concentrically on a holder 7, and an elastic ring 2 is inserted into a gap 6 between opposed peripheral surfaces of both of them 1, 3. Subsequently, when a segmental die 8 is allowed to go into the inside periphery of the peripheral wall of the hub 1, and a punch 10 is operated downward, the outside peripheral tapered surface of the punch 10 and the inside peripheral tapered surface of the segmental die 8 are brought to press-contacting and slid, the segmental die 8 moves to the outside, and diameter expanding press of the hub 1 is executed. In this case, the elastic ring 2 is welded by pressure firmly to the opposed peripheral surfaces of the hub 1 and the vibration ring 3 by a projecting line 12 of the segmental die 8.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of manufacturing a torsional damper used primarily for damping torsional vibration of a rotating shaft.

[Conventional technology]

As a type of torsional damper, one with a fitting structure as shown in FIG. 3 is widely used.

That is, this torsional damper has a hub (1) which is a press-molded metal plate, and a vibration ring (3) arranged on the outer circumferential side of the hub (1) and made of cast iron or the like. An elastic ring (2) made of rubber material is fitted into the hub (1), and is pivotally attached to a rotating shaft (not shown) in the hub (1), and the elasticity of the elastic ring (2) and the mass of the vibration ring (3) are The hub (1) has a protruding circumferential strip (4) approximately at the center in the axial direction of the outer circumferential surface of the hub (1). Four circumferential strips (5) corresponding to the protruding circumferential strips (4) are formed on the inner peripheral surface of the vibrating ring (3), and the elastic ring (2) is bent between the two circumferential strips (4) and (5). 3 members (1
) The structure prevents relative displacement in the axial direction of (2) and (3).

Conventionally, this type of torsional damper has a knob (1), an elastic ring (2), an elastic ring (2), and a vibration ring (
3) In order to obtain a reliable fitting force, as shown in Fig. 4,
The gap (6) between the opposing peripheral surfaces of the hub (1) and the vibration ring (3)
It is manufactured by press-fitting an elastic ring (2) having a wall thickness (↑) larger than the radial direction @(W') of the gap (6") into the gap (6").

[Problem that the invention seeks to solve]

However, according to the above-mentioned conventional manufacturing method, it is extremely difficult to press-fit the elastic ring (2) whose wall thickness (T) is larger than the radial width (W') of the gap (6°); Even when pushed in, the elastic ring (
2) is undulated, /\bu (1) and vibration ring (3)
There was a problem that the elastic ring (2) would be damaged if the elastic ring (2) was not fitted in a uniform manner or if the elastic ring (2) was not fitted in a uniform manner.

In view of these problems, the present invention has been made with the aim of solving the second difficulty in manufacturing and improving the quality of the product.

[Means for solving problems]

The method for manufacturing a torsional damper according to the present invention which solves the above-mentioned problems is to provide a torsion damper which is pre-press-formed to a smaller diameter than the final shape, and which are spaced apart on the outer circumferential side of the hub. The elastic ring is sandwiched between the opposing circumferential surfaces of the vibrating ring, and then the circumferential wall of the hub is press-molded from the inner circumferential side to expand its diameter using a split die. It is crimped between the rings.

[For production]

According to the method of the present invention, since the hub is initially preformed to have a small diameter, there is a large gap between the hub and the vibration ring, so there is no difficulty in forcefully press-fitting the elastic ring, and the press pressure from the split mold is eliminated. Therefore, the final molding process of the hub and the crimping of the elastic ring to the opposing circumferential surfaces of the hub and the vibrating ring are performed at the same time.

〔Example〕

An embodiment of the method of the present invention will be described below with reference to the drawings.

In Figures 1 and 2, (7) represents the hub (1) and vibration ring (3), which are the components of the torsional damper.
) to place them concentrically with each other, (
8) is a split mold which is divided into eight parts in the circumferential direction, one combination of which has a substantially cylindrical shape, and is provided so as to be movable in the radial direction and to move forward and backward in one step perpendicularly to the holder (7). The split mold (8) is formed with an inner circumferential tapered surface (9) having a smaller diameter on the lower side. (10) is a punch that reciprocates in the axial direction (vertical direction) in the inner circumferential cavity of the split die (8), and the lower part of the outer circumferential surface of the punch slides in substantially close contact with the inner circumferential tapered surface (9). The outer periphery has a tapered surface (11), and the punch (10) moves downward (arrow Y) while sliding.
direction), the split mold (8) is pushed away in the outer diameter direction (arrow X direction), and presses the peripheral wall (1") of the knob (1) from the inner peripheral side to perform a diameter expansion press. (12) is a protrusion provided near the lower part of the outer circumferential surface of the split mold (8) in order to form a protruding circumferential strip (4) on the outer circumferential surface of the circumferential wall (1°) during the pressing. It is a ridge.

In the above configuration, as shown in FIG.
7) Above, in the final product stage, the diameter dimension (D
2; A cast iron hub (1) made of a metal plate that has been pre-press-formed into a cross-sectional shape with a diameter (Dl) smaller than that shown in Fig. vibrating rings (3) made of
An elastic ring (2) made of rubber is inserted into the gap (6) between the opposing circumferential surfaces of step 3) using a jig (not shown). At this time, since the diameter dimension (Dl) of the hub (1) is small, the radial width (W) of the gap (6) is relatively wide, and therefore the elastic ring (2) can be easily inserted with almost no resistance. can be done.

Next, when the split mold (8) is inserted into the inner circumference of the peripheral wall (1゛) of the hub (1) and the punch (lO) is operated downward (in the direction of arrow Y), the outer peripheral tapered surface of the punch (lO) ( 11) slides in pressure contact with the inner circumferential tapered surface (9) of the split mold (8), and the split mold (8) accordingly moves in the outer radial direction (arrow X direction), as shown in FIG. As shown, the peripheral wall (lo) of the hub (1)
is pressed from the inner I, 1 side to perform diameter expansion pressing. At this time, as the diameter of the hub (1) increases, the elastic ring (2) interposed between the hub (1) and the vibrating ring (3) is attached to the peripheral wall by the protrusion (12) of the split mold (8). The vibrating ring (3) is compressed while being bent between the protruding strip (4) formed at an angle of (1°) and the four circumferential strips (5) on the inner circumferential surface of the vibrating ring (3).

When the punch (lO) reaches the bottom dead center (P), the hub (
+) expands to the diameter dimension (D2), and the elastic ring (2) is firmly pressed against the opposing circumferential surfaces of the hub (1) and the vibration ring (3). After that, move the split mold (8) back, 1i! By increasing the diameter, a torsional damper having a shape as shown in FIG. 3 described above can be obtained.

〔Effect of the invention〕

As is clear from the above 8 explanations, according to the manufacturing method of the present invention, the difficult process of forcing the elastic ring between the hub and the vibrating ring is not required, so the elastic ring does not undulate or break due to press-fit resistance. The hub, elastic ring, and vibrating ring can be crimped together in a good manner, and productivity is improved because the final forming of the hub and the crimping of the elastic ring between the hub and the vibrating ring are performed at the same time. It has excellent effects such as a significant improvement in

[Brief explanation of the drawing]

1 and 2 are explanatory diagrams showing a method of manufacturing a torsional damper according to an embodiment of the undeveloped 4 are explanatory diagrams showing a conventional manufacturing method.

Claims (1)

[Claims] The hub (1) is pre-press-molded to a smaller diameter than the final shape, and the vibrating ring (3) is placed at a distance on the outer circumferential side of the hub (1). After positioning the ring (2) so as to sandwich the ring (2), the circumferential wall (1') of the hub (1) is press-molded from the inner circumferential side using a split mold (8) to form an elastic ring (2).
) between a hub (1) and a vibration ring (3).