JP2526504Y2 - Pulley with damper - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pulley equipped with a damper, such as a crank damper, which is mounted on a rotating shaft and suppresses harmful vibration generated on the shaft, and in particular, a cylindrical pulley made of aluminum. The present invention relates to an improvement of a damper-attached pulley in which a steel material such as iron is lined with a predetermined thickness on the inner wall of the body, that is, a steel sleeve is cast out of aluminum.

[0002]

2. Description of the Related Art In recent years, it has been required to reduce the weight of an internal combustion engine of an automobile or the like, and attempts have been made to hollow a crankshaft or to make an engine housing of a lightweight material such as aluminum. Further, there is a type in which a light-weight material such as aluminum is used for a pulley with a damper to be attached to a crankshaft, thereby reducing the weight and enhancing the burst performance of the engine. In such a pulley with a damper, if the entirety is made of aluminum or the like, the aluminum inner wall in contact with the crankshaft may be gradually cut due to abrasion and loosen with the shaft. A pulley with a damper has been proposed which uses iron only in the thickness of, that is, casts iron with aluminum.

[0003]

However, in the conventional pulley with a damper in which iron is cast from aluminum, there is a problem in that the aluminum is softer than iron, so that the aluminum and iron are loosened. Was. The present invention
It is an object of the present invention to provide a pulley with a damper that increases the binding force between the army irons and eliminates looseness.

[0004]

According to the present invention, a steel sleeve which is fitted and fixed to a rotating shaft is cast into a sleeve, and a coaxial hub portion, a pulley seat portion and one end of the pulley seat portion are provided around the sleeve. A pulley main body composed of an aluminum casting having a damper mounting portion extending in a centrifugal direction from the pulley main body, a pulley groove portion mounted via a first elastic body in a compressed state on the pulley seat portion of the pulley main body, A mass portion attached to the damper mounting portion via a second elastic body, wherein the first elastic body is divided by a surface including one end surface of the steel sleeve.
In one of the axial widths, the other end surface side of the steel sleeve is wider than the one end surface side.

[0005]

The pulley groove according to the present invention is attached to the pulley seat while the first elastic body is compressed. In this method, a damper assembly composed of a pulley groove and a first elastic body is mounted by press-fitting, whereby the pulley groove ties the steel sleeve through the aluminum casting and places the aluminum sleeve between the aluminum casting and the steel sleeve. There is no loosening. In addition, by making the other end surface side of the steel sleeve wider than the opposite side, the above-described binding force can be more reliably generated.

[0006]

FIG. 1 is a sectional view showing an embodiment of a pulley with a damper according to the present invention. 2 and 3 are cross-sectional views showing components of the pulley with a damper shown in FIG. 1 in an extracted manner, respectively, and FIG. 3 is along the line CC in FIG. This pulley with a damper is a steel sleeve 1 fitted and fixed to a rotating shaft.
A hub portion 8 formed by integrally casting the sleeve 14; a pulley seat portion 7 extending from the hub portion 8 in the centrifugal direction and having an outer peripheral surface concentric with the sleeve 14; A pulley main body 1 composed of an aluminum cast portion comprising a flange-shaped damper mounting portion 6 extending in the centrifugal direction from one end of the pulley 7 and a first elastic body 12 formed of rubber or the like on the pulley seat 7. Pulley groove 13 to be mounted
And a second member formed of rubber or the like on the damper attachment portion 6.
And a mass portion 10 mounted via an elastic body 9. The first elastic body 1 between the pulley seat 7 and the pulley groove 13
The first elastic member 1 is interposed in a compressed state and divided by a surface including one end surface of the steel sleeve 14.
The two widths A and B in the axial direction are such that the width B on the other end surface side 4 of the steel sleeve 14 is wider than the width A on the one end surface 3 side.

Note that the first elastic body 12 is
Through the pulley seat 7. The interval between the inner diameter of the pulley groove 13 and the outer diameter of the press-fit ring 11 is set to a size that maintains the interposed first elastic body 12 in a compressed state. Also, in the press-fit ring 11,
As shown in FIG. 2, a taper 11a is formed by chamfering to facilitate press-fitting.

As shown in FIG. 3, the steel sleeve 14 has a concave portion 14a and a convex portion 14b formed on the outer periphery thereof in a gear shape. These concave portion 14a and convex portion 14
b serves as a stopper that fits in engagement with the aluminum casting of the pulley body 1 and does not rotate the steel sleeve 14 in the circumferential direction. In the pulley with a damper having the above-described configuration, first, a steel sleeve 14 is prepared in advance, and then the steel sleeve 14 is prepared by casting aluminum with the lining as a lining.
Further, the damper including the mass member 10 and the second elastic body 9 is formed by, for example, insert molding.

The damper-equipped pulley is mounted on, for example, a crankshaft, and the torsion vibration of the crankshaft caused by the explosion process of the engine is attenuated by the second elastic body 9 and the first elastic body 12, so that the vibration and noise of the engine are reduced. Can be reduced. In such a configuration, the sleeve 14
If there is a gap between the aluminum casting and the aluminum casting, the intended purpose will not be achieved.

In this embodiment, the pulley groove 13 and the first
By attaching the elastic body 12 to the pulley seat 7 by press fitting, the steel sleeve 14 is intended to be tightened by the force of pressing the pulley seat 7 by the pulley groove 13. The aluminum casting and steel sleeve 1
4 can be prevented from loosening. In this case, the tightening force can be strengthened by increasing the pressing force. Further, of the two widths A and B in the axial direction of the rubber elastic body 12 divided by the surface including the one end surface 3 of the steel sleeve 14, the width B on the other end surface 4 side of the steel sleeve 14 is the opposite. The width A is wider than the side A to further enhance the binding force. This prevents the formation of a gap between the sleeve 14 and the hub 15.

Further, in this embodiment, the steel sleeve 14
A concave portion 14a and a convex portion 14b are formed on the outer periphery of the steel member to further strengthen the binding force between the aluminum portion and the steel sleeve 14. The angle α indicating the sharpness in the shaft direction of the convex portion 14b and β indicating the sharpness in the circumferential direction maximize the prevention of loosening between the aluminum and the iron to the extent that the molten aluminum does not deteriorate during manufacture. Choose a value. Also, in this way, on the outer periphery of the steel sleeve 14, the concave portion 14a and the convex portion 14b
Is also a measure to prevent manufacturing defects.

In the above embodiment, the pulley with a damper attached to the crankshaft has been described as an example. However, the present invention is not limited to such an example of use, and a general wheel element having a damper function attached to a rotating shaft. Can be used as

[0013]

As described above, according to the present invention, there is an effect that the steel sleeve lined with the aluminum casting and the aluminum casting are prevented from loosening, and the torsional vibration suppressing performance of the shaft is improved.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a pulley with a damper according to the present invention.

FIG. 2 is a sectional view showing an example of a sub-tamper according to the present invention.

FIG. 3 is a sectional view showing the steel sleeve according to the present invention in detail along the line CC in FIG. 1;

[Explanation of symbols]

1 ... pulley body, 6mm damper mounting part, 7 ... pulley seat part,
11: press-fit ring, 12: first elastic body, 13: pulley groove, 14: steel sleeve, 14a: concave, 14b: convex.

Claims (1)

(57) [Scope of request for utility model registration] 1. A steel sleeve fitted and fixed to a rotary shaft, a hub formed by integrally casting the sleeve, and an outer peripheral surface extending in a centrifugal direction from the hub and concentric with the sleeve. A pulley main body composed of an aluminum cast part comprising a pulley seat having a pulley seat and a flange-shaped damper mounting portion extending in a centrifugal direction from one end of the pulley seat; and a first elastic body interposed between the pulley seat and the first elastic body. In a pulley with a damper including a pulley groove portion to be mounted and a mass portion mounted to the damper mounting portion via a second elastic body, the first elastic body between the pulley seat and the pulley groove is compressed. Two widths of the first elastic body in the axial direction that are interposed in a state and divided by a surface including one end surface of the steel sleeve are such that the width of the other end surface side of the steel sleeve is wider than the width of one end surface side. Dan Pulley with pad.