JP2000009209A - Damper pulley - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the manufacture, to reduce the construction cost, and to lighten the weight by forming a boss into a disc shape and a hub into a U-shaped half cross section and by pressingly integrating the hub with the boss. SOLUTION: A damper pulley is so formed that a hub 2 is pressed in a disk-shaped boss 1 and a mass 4 vulcanizedly sticking rubber 3 thereto is pressed in the hub 2. The boss 1 is formed of an approximately disc-shaped casting having a hole opened in its center part. The hub 2 is formed into a U-shaped cross section whose internal/outer circumferential edge parts are bent by 90 deg. by a press using an approximately disc-shaped iron plate having a hole opened in its central part. The bent part in the internal circumferential edge side and the bent part in the outer circumferential edge side are constituted into connecting parts with the boss side and the mass side respectively. Secondly, the damper pulley is manufactured by pressing the hub 2 in the boss 1 for integrating the both with each other and a cutting by setting them to a prescribed radial part to obtain the dimension of the internal diameter.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a damper pulley for reducing torsional vibration of a rotating shaft of an internal combustion engine.

[0002]

2. Description of the Related Art In a conventional damper pulley, for example, as shown in FIG. 6 (half sectional view, that is, a sectional view obtained by dividing the center part of a full sectional view into two parts), the rotation of a crankshaft or the like A hub 102 having a boss 101 attached to and fixed to a shaft 100, and a mass 10 provided radially outside the hub 102 via an elastic body 103 such as rubber.
4 is known.

[0003]

Usually, this damper pulley is manufactured by cutting a casting because a boss is required. However, since the manufacturing is complicated, the cost is increased and the weight is reduced. And become a problem.

Accordingly, an object of the present invention is to provide a damper pulley which is easy to manufacture, can be reduced in weight, and can reduce the manufacturing cost in view of the above-mentioned drawbacks.

[0005]

That is, the present invention provides a damper pulley having a hub provided with a boss attached to a rotating shaft, and a mass attached to the outer peripheral surface of the hub via an elastic body such as rubber. The boss is formed from a substantially disk-shaped member, the hub is formed in a substantially U-shape in a half section, and the hub is press-fitted and integrated with the boss.

[0006]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a half sectional view showing a damper pulley according to an embodiment of the present invention. In this damper pulley, a hub 2 is press-fitted into a substantially disk-shaped boss 1, and a rubber 3 is vulcanized and bonded to the hub 2. Trout 4
Is press-fitted. Reference numeral 5 in the figure denotes a nut, which is screwed to a rotating shaft, for example, a crankshaft 7 via a washer 6.

The boss 1 is made of a substantially disk-shaped casting having a hole in the center, and a disk-shaped iron plate having a hole in the center is used. Degree bending
It may be of an upright configuration.

The hub 2 has a substantially U-shaped cross section obtained by bending the inner and outer peripheral edges by 90 degrees by a press using a substantially disk-shaped iron plate having a hole opened in the center. The bent portion on the peripheral edge side forms a connecting portion with the boss side, and the bent portion on the outer peripheral edge side forms a connecting portion with the mass side.

Next, a method of manufacturing a damper pulley according to this embodiment will be described with reference to FIGS. First, as shown in FIG. 2, when the hub 2 is press-fitted into the boss 1 and the two are integrated, as shown in FIG. 3, cutting is performed in accordance with a predetermined radius portion (line L). Get the dimensions of

[0010] Thereafter, as shown in FIG. 4, a preformed mass side portion is press-fitted from outside the hub 3. In addition,
An iron cylindrical body 8 is fixed to the mass side portion on the inner peripheral surface side of the substantially ring-shaped rubber 3.

In this embodiment, the nut is fastened and fixed with a nut, but it may be fixed with a pin 9 as shown in FIG.

Therefore, according to this embodiment, since the boss-side connecting portion of the hub 2 is formed by a bent portion, the contact area between the hub 2 and the boss 1 increases, and both are more securely fixed. .

[0013]

As described above, according to the present invention, the hub is formed to have a substantially U-shaped cross section and is pressed into the boss. In other words, the hub is manufactured by cutting a conventional casting. In addition, since the iron plate is formed by press working and press-fitting, the manufacturing cost can be greatly reduced, and the manufacturing becomes extremely easy, and the weight can be easily reduced.

[Brief description of the drawings]

FIG. 1 is a schematic half sectional view showing a damper pulley according to the present invention.

FIG. 2 is a sectional view showing a method of manufacturing a damper pulley according to the present invention.

FIG. 3 is a sectional view of the same.

FIG. 4 is a sectional view of the same.

FIG. 5 is a schematic sectional view showing another damper pulley.

FIG. 6 is a schematic diagram showing a conventional example.

[Explanation of symbols]

 Reference Signs List 1 boss 2 hub 3 rubber (elastic body) 4 mass 7 crankshaft (rotary axis)

Claims (1)

[Claims] 1. A damper pulley comprising a hub provided with a boss attached to a rotating shaft, and a mass attached to an outer peripheral surface of the hub via an elastic body such as rubber, wherein the boss has a substantially disk shape. A damper pulley, wherein the hub is formed in a substantially U-shape in half section, and the hub is press-fitted and integrated with the boss.