JPH11287295A - Damper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a damper that is attached to a camshaft pulley without deforming a continuous variable mechanism by fitting load, pertaining to this damper to be attached to the camshaft pulley equipped with the continuous variable mechanism. SOLUTION: This is a damper where a mass body 4 is connected to the outer circumferential side of a hub 1 via an elastic body 3, and this hub 1 is provided with a mounting part 1a to be locked to the end face of a radial direction part 54a of a camshaft pulley 54 equipped with a continuous variable mechanism 55 by a bolt 5, and a tubular part 1b being integrally formed toward an axial one way from a radial end of the mounting part 1a, and being set up in the outer circumferential side of the continuous variable mechanism 55 so as not to have fitting allowance, and in this constitution, the mass body 4 is connected to the outer circumferential side of the tubular part 1b via the elastic body 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a damper, and more particularly, to a dynamic damper attached to a camshaft pulley having a continuously variable mechanism.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG.
A damper is known in which a mass body 53 is connected to an outer peripheral side of a rubber body via an elastic body 52 made of a rubber-like elastic material. This damper is provided by a camshaft pulley provided with a continuously variable mechanism 55 as shown in FIG. The following inconveniences will occur if an attempt is made to attach it to 54.

[0003] That is, the conventional damper has a structure in which the hub 51 is fitted on the outer peripheral side of the mounting member with respect to mounting. When the damper is mounted on the camshaft pulley 54 having the continuously variable mechanism 55 as described above, the mounting member is the continuously variable mechanism 55. However, a hydraulic unit (not shown) that has been subjected to precision machining is built in the continuously variable mechanism 55. Therefore, when the damper is fitted on the outer peripheral side of the continuously variable mechanism 55, if the deformation occurs in the continuously variable mechanism 55 due to the fitted load, an abnormality may occur in the hydraulic unit,
If possible, it is desirable to attach a damper to a portion other than the outer periphery of the continuously variable mechanism 55.

In FIG. 3, reference numeral 56 denotes an intake-side camshaft, and 57 denotes an exhaust-side camshaft. The camshaft pulley 54 with the continuously variable mechanism 55 described above is attached to the intake-side camshaft 56. On the other hand, the exhaust side camshaft 57 has a camshaft pulley 58 without a continuously variable mechanism.
Is attached.

[0005]

SUMMARY OF THE INVENTION In view of the foregoing, it is an object of the present invention to provide a damper which can be attached to a camshaft pulley without deforming a continuously variable mechanism by a fitting load.

Another object of the present invention is to provide a damper capable of preventing the mass body from being eccentric to the hub during the rotation operation.

[0007]

In order to achieve the above object, a damper according to a first aspect of the present invention is a damper in which a mass body is connected to an outer peripheral side of a hub via an elastic body made of a rubber-like elastic material. The hub is integrally formed with a mounting portion fixed to an end face of a radial portion of a camshaft pulley provided with a continuously variable mechanism with a bolt, and one side in the axial direction from a radial end portion of the mounting portion, A tubular portion arranged on the outer peripheral side of the continuous variable mechanism so as not to have a fitting margin, and the mass body is connected to the outer peripheral side of the tubular portion via the elastic body. It was to be.

According to a second aspect of the present invention, in the damper of the first aspect, the mass body is slidably engaged with the camshaft pulley in a radial direction so as to prevent eccentricity of the mass body. I decided to.

[0009] Like the damper according to the first aspect of the present invention having the above-described structure, the hub is fixed to the end face of the radial portion of the camshaft pulley provided with the continuously variable mechanism by bolts, and the mounting portion is mounted on the hub. A cylindrical portion that is integrally formed from the radial end of the portion toward one side in the axial direction, and that is disposed so as not to have a fitting allowance on the outer peripheral side of the continuously variable mechanism. Attached to the radial portion of the pulley, no fitting load is applied to the continuously variable mechanism. Therefore, it is possible to prevent the continuous variable mechanism from being deformed due to the fitting load acting on the continuously variable mechanism.

[0010] In addition, in order to prevent the eccentricity of the mass body, the mass body is slidably movable in the radial direction with respect to the camshaft pulley in order to prevent the eccentricity of the mass body. When engaged, it is possible to prevent the mass body from being eccentric with respect to the hub during the rotation operation.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings.

As shown in FIG. 1, the dynamic damper according to this embodiment first includes a hub 1, and a sleeve 2 is fitted on the outer peripheral side of the hub 1. A mass body (also referred to as a vibration ring) 4 is connected via an elastic body 3 made of a rubber-like elastic material.

The hub 1 is formed in a ring shape from a predetermined metal such as a sheet metal, and has a mounting portion 1a fixed to one axial end surface of a radial portion 54a of the camshaft pulley 54 with a bolt 5, and a mounting portion 1a. A cylindrical portion 1b formed integrally from the inner peripheral end of the cylindrical member 1a in one axial direction and arranged on the outer peripheral side of the continuously variable mechanism 55 so as not to have a fitting allowance, and a shaft of the cylindrical portion 1b; An integral flange portion 1c is formed integrally from one end in the radial direction toward the inside in the radial direction, and is arranged at one end in the axial direction of the continuously variable mechanism 55.

The mounting portion 1a is formed in an annular or serpentine shape, and has a required number of screws according to the number of bolts 5 and the number of screw holes 54c provided in the radial portion 54a of the cam shaft pulley 54. Holes 1d are provided in an equidistant manner.

The cylindrical portion 1b is basically formed in a cylindrical shape, and is provided with a tapered step portion 1e at an intermediate portion in the axial direction in accordance with the outer peripheral surface shape of the continuously variable mechanism 55.
A relatively large-diameter large-diameter cylindrical portion 1f is provided on the mounting portion 1a side of the step portion 1e, and a relatively small-diameter small-diameter cylindrical portion 1g is provided on the flange portion 1c side. The inner diameter of the cylindrical portion 1b is set to be larger than the outer diameter of the continuously variable mechanism 55 over the entire length in the axial direction. A gap (radial gap) 6 is provided.

The flange 1c is formed in an annular or serpentine shape, and a gap (axial gap) 7 is also provided between the flange 1c and the continuously variable mechanism 55.

The sleeve 2 is formed of a predetermined metal such as a sheet metal into a cylindrical shape, and is fitted to the outer peripheral side of the small-diameter cylindrical portion 1g of the hub 1 with a predetermined fitting margin.

The elastic body 3 is vulcanized and molded into an annular shape with a predetermined rubber, and is simultaneously vulcanized and bonded to the outer peripheral surface of the sleeve 2 and the inner peripheral surface of the mass body 4.

The mass body 4 is formed in a ring shape from a predetermined metal such as cast iron. An annular notch 4a facing the pulley portion (also referred to as a sprocket) 54a of the camshaft pulley 54 is formed at one axial end of the outer peripheral surface of the mass body 4.
Is provided, so that the mass body 4 is
With a, it is slidably engaged with the pulley portion 54a in the radial direction.

The dynamic damper having the above configuration is
The resonance function absorbs torsional vibrations and the like generated in the camshaft, and is characterized in that the above-described configuration has the following functions and effects.

That is, first of all, the hub 1 has the mounting portion 1a and the radial portion 54a of the camshaft pulley 54.
Is fixed to the end surface of the camshaft pulley 54 by the bolt 5 and the cylindrical portion 1b and the flange portion 1c are not in contact with the outer surface of the continuously variable mechanism 55. Even if it is attached, no fitting load acts on the continuously variable mechanism 55 at all. Therefore, the fitting load acts on the continuously variable mechanism 55, and the continuously variable mechanism 5
5 can be prevented from being deformed, whereby an abnormality can be prevented from occurring in a hydraulic unit (not shown) in the continuously variable mechanism 55. The hub 1 has a cylindrical portion 1b and a flange portion 1c.
Thus, the continuously variable mechanism 55 or the hydraulic unit can be protected.

Further, since the mass body 4 is slidably engaged with the pulley portion 54a in the radial direction with the notch 4a, the mass body 4 is eccentric to the hub 1 during the rotation operation (radial direction). Displacement) can be prevented. Therefore, it is possible to use rubber having a small spring constant for the elastic body 3 without worrying about the eccentricity of the mass body 4, thereby effectively reducing torsional vibration, rotation fluctuation, noise, etc. generated in the camshaft. Can be.

As shown in the figure, since the mass body 4 is disposed at one end in the axial direction of the camshaft pulley 54 and on the rear side, the axial length of the mass body 4 is set to be relatively large. Is possible. Therefore, it is possible to set the magnitude of the inertial mass to be relatively large, and it is also possible to effectively reduce torsional vibration, rotation fluctuation, noise, and the like generated in the camshaft.

[0024]

The present invention has the following effects.

That is, first, in the damper according to the first aspect of the present invention having the above structure, the hub is fixed to the end face of the radial portion of the camshaft pulley having the continuously variable mechanism by a bolt, A cylindrical portion that is integrally formed from the radial end of the mounting portion toward one side in the axial direction and that is disposed so as not to have a fitting allowance on the outer peripheral side of the continuously variable mechanism. Even if the damper is attached to the camshaft pulley, no fitting load acts on the continuously variable mechanism. Therefore, it is possible to prevent the continuously variable mechanism from being deformed due to the application of the fitting load to the continuously variable mechanism, thereby preventing the hydraulic unit inside the continuously variable mechanism from being abnormal. Can be. Further, since the hub covers the continuously variable mechanism with its cylindrical portion, the continuously variable mechanism or the hydraulic unit can be protected.

In addition, in the damper according to the second aspect of the present invention having the above structure, the mass body is slidably movable in the radial direction with respect to the camshaft pulley so as to prevent eccentricity of the mass body. Due to the engagement, it is possible to prevent the mass body from being eccentric with respect to the hub during the rotation operation. Therefore, it is possible to use rubber with a small spring constant for the elastic body without worrying about the eccentricity of the mass body,
Thereby, torsional vibration, rotation fluctuation, noise, and the like generated in the camshaft can be effectively reduced.

[Brief description of the drawings]

FIG. 1 is a half sectional view showing a mounted state of a damper according to an embodiment of the present invention.

FIG. 2 is a half sectional view of a damper according to a conventional example.

FIG. 3 is an exploded perspective view of a camshaft.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hub 1a Attachment part 1b Tubular part 1c Flange part 1d, 54c Screw hole 1e Step part 1f Large-diameter cylindrical part 1g Small-diameter cylindrical part 2 Sleeve 3 Elastic body 4 Mass body 4a Notch part 5 Bolt 6,7 Gap 54 Camshaft pulley 54a Radial section 54b Pulley section 55 Continuously variable mechanism

Claims (2)

[Claims] 1. A damper in which a mass body (4) is connected to an outer peripheral side of a hub (1) via an elastic body (3) made of a rubber-like elastic material, wherein the hub (1) is a continuously variable mechanism. A mounting portion (1a) fixed to an end face of a radial portion (54a) of a camshaft pulley (54) provided with a (55) with a bolt (5), and a shaft extending from a radial end of the mounting portion (1a). A cylindrical portion (1b) integrally formed in one direction, and arranged on the outer peripheral side of the continuously variable mechanism (55) so as not to have a fitting allowance. ), The mass body (4) is connected to the outer peripheral side of the mass body via the elastic body (3). 2. The damper according to claim 1, wherein the mass body (4) is slidably engaged with the camshaft pulley (54) in a radial direction so as to prevent eccentricity of the mass body (4). A damper characterized by being.