JPH10306849A - Variable speed type damper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the generation of noise and reliably suppress the damage of an internal part, in a variable speed type damper coupled to a rotary shaft. SOLUTION: A plurality of recessed parts 2 are formed at equal intervals in a peripheral direction in the side of a flywheel 1 coupled to an engine output shaft. Columnar damper weights are respectively arranged in recessed parts 2. Constitution is formed such that a damper weight 3 is oscillated along the inner peripheral surface of the recessed part 2 in a way that a sleeve 4 formed of a solid lubricant is disposed astride between the outer peripheral surface of the damper weight 3 and the inner peripheral surface of the recessed part 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a constant-order dynamic damper provided on a flywheel or the like for reducing a torque fluctuation of an engine output shaft or the like, that is, a variable speed damper.

[0002]

2. Description of the Related Art A conventional variable speed damper is disclosed in
As disclosed in Japanese Patent Publication No. 199551, a hole is formed in a flywheel body driven while receiving a torque that varies from a crankshaft output shaft, and a weight is swingably accommodated in the hole. Therefore, the torque fluctuation is absorbed by the inertial force due to the swing of the weight when the fluctuation torque is input, but when the engine is started or the engine is stopped, the weight falls to the inner peripheral surface of the hole by its own weight. As a result, there are problems such as generation of noise, damage to the outer peripheral surface of the weight and the inner peripheral surface of the hole, and deformation.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a variable speed damper connected to a rotating shaft, in which noise is prevented from occurring and internal damage is surely suppressed.

[0004]

According to the present invention, a variable speed damper according to the first aspect of the present invention includes a disk-shaped damper body coaxially connected to a rotating shaft and a rotating shaft of the damper body. In a variable speed damper in which a cross section perpendicular to the center is circular and a center line is formed with a concave portion or a hole having a center line parallel to the rotation axis, and a columnar damper weight is disposed in the concave portion or the hole, The other outer peripheral surface of the damper weight, the outer peripheral surface of which is in contact with the inner peripheral surface of the hole, is disposed so as to straddle between the inner peripheral surface of the concave portion or the hole and the inner surface of the concave portion or the hole. It has a spacer for guiding the rolling of the damper weight along the peripheral surface.

Therefore, the damper weight disposed in the concave portion or the hole of the damper body is formed by the spacer disposed between the outer peripheral surface and the inner peripheral surface of the concave portion or the hole. Is guided so as to roll along the inner peripheral surface of the damper body, so that when the damper body rotates around the rotation axis, the damper weight subjected to the centrifugal force is located on the outer peripheral side of the damper body in the recess or the hole. It is arranged on the inner peripheral surface, so that the damper weight is held in an uneven position in the concave portion or the hole. In this case, when the torque fluctuation is transmitted from the rotating shaft to the damper body, the damper weight is By rolling on the inner peripheral surface of the concave portion or the hole, the torque fluctuation can be absorbed,
The presence of the spacer can surely prevent the damper weight from falling onto the inner peripheral surface of the concave portion or the hole when the rotation of the rotary shaft starts or stops.

According to a fourth aspect of the present invention, there is provided a variable speed damper, wherein a disk-shaped damper body coaxially connected to a rotation shaft has a circular cross section perpendicular to the rotation axis of the same damper body. In a variable speed damper in which a concave portion or a hole whose center line is parallel to the rotation axis is formed, and a columnar damper weight is disposed in the concave portion or the hole, a light liquid is provided inside the concave portion or the hole. Is filled.

Accordingly, the damper weight disposed in the concave portion or the hole of the damper main body can be swung in the concave portion or the hole even if the light liquid is filled in the concave portion or the hole. When the damper main body rotates around the axis, the damper weight subjected to the centrifugal force is arranged on the inner peripheral surface on the outer peripheral side of the damper main body in the concave portion or the hole, and therefore, the damper weight is set in the concave portion or the hole. In this case, when the torque fluctuation is transmitted from the rotating shaft to the damper main body, the damper weight swings on the inner peripheral surface of the concave portion or the hole portion, whereby the torque is reduced. While the fluctuation can be absorbed, the drop of the damper weight onto the inner peripheral surface of the concave portion or the hole at the time of starting or stopping the rotation of the rotating shaft is caused by viscous resistance of the light liquid. Is braking, thus, it is possible to reliably prevent the collision of the damper weights to the recess or the hole inner peripheral surface.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention shown in the drawings will be described by assigning the same reference numerals to equivalent parts of each embodiment. 1 and 2, a plurality of, for example, six, bottomed recesses 2 are formed at equal intervals in a circumferential direction on a side surface of a disc-shaped flywheel 1 coaxially connected to an output shaft of a diesel engine. Each recess 2 has a circular cross section perpendicular to the rotation axis O1 of the flywheel 1, and its center line O2 is parallel to the rotation axis O1.

A cylindrical damper weight 3 having an axis parallel to the center line O 2 is disposed in each recess 2, and a gap between the outer peripheral surface of the damper weight 3 and the inner peripheral surface of the recess 2 is provided. A spacer 4 having a substantially crescent-shaped vertical cross section is disposed over the spacer. It is composed of a solid lubricant that is a relatively lightweight dry friction bearing material such as ethylene tetrafluoride resin, polyamide resin, and phenol resin, or an oil-impregnated bearing material such as a powder sintered oil-impregnated material, a growth cast iron oil-impregnated material, or Graphite-based heat-resistant materials based on solid lubrication using solid lubricants such as graphite, molybdenum disulfide, metallic soap, and soft metals with extremely low shear resistance, brass or bronze Dry friction bearings such as solid lubricant embedded materials, cast iron solid lubricant embedded materials, aluminum bronze solid lubricant embedded materials, solid lubricant dispersed sintering materials, wear-resistant copper alloys, metal surface treatment materials, etc. The layer of the solid lubricant material is attached to the inner and outer surfaces of the relatively lightweight plastic material, respectively, so that the overall structure is relatively light.

Therefore, the inner peripheral surface of the spacer 4 and the outer peripheral surface of the damper weight 3, and the outer peripheral surface of the spacer 4 and the inner peripheral surface of the recess 2 are slidably contacted with each other. 2 is rotatably supported in the recess 2 with respect to the inner peripheral surface thereof, and a variable speed damper 5 is formed. Even if the material of the spacer 4 is any of the above, heat resistance is improved. At the same time, it does not require lubricating oil, which is a fluid lubricant.

That is, when the flywheel 1 rotates about the rotation axis O1 by the rotation of the output shaft of the diesel engine, each of the damper weights 3 receiving the centrifugal force rolls on the inner peripheral surface of the recess 2. 1, the torque fluctuation is transmitted from the output shaft of the diesel engine to the flywheel 1 in this case. When the spacer 4 swings inside the concave portion 2 by sliding with the inner peripheral surface of the concave portion 2, the damper weight 3 rolls along the inner peripheral surface of the concave portion 2, and swings at an uneven position in the concave portion 2. The rotation axis O1 of the flywheel 1 and the recess 2
The center line O2 of the concave portion 2, the distance between the center line O2 of the concave portion 2 and the center of gravity G of the damper weight 3, and the mass of the damper weight 3 as appropriate, so that the constant order based on the torque fluctuation of the output shaft of the diesel engine can be obtained. The angular acceleration can be effectively reduced to suppress the torque fluctuation, and the damper weight 3 is held by the spacer 4 in the recess 2 so that the damper weight can be reduced when the engine is started or stopped. Since the weight 3 does not drop onto the inner peripheral surface of the concave portion 2 by its own weight and collides with it, noise is generated due to the mounting of the damper weight 3 or the surface of the damper weight 3 or the inner peripheral surface of the concave portion 2. It is possible to surely prevent damage and deformation.

Further, while the spacer 4 has heat resistance, it is necessary to use a fluid lubricant such as oil or grease which easily deteriorates, disappears or is unevenly distributed for the rolling of the damper weight 3 and the sliding of the spacer 4. Therefore, even if a high centrifugal force is applied at a relatively high temperature like the flywheel 1 connected to the output shaft of the diesel engine, the function as the variable speed damper 5 can be maintained well over a long period of time. There is a feature that can be.

In the first embodiment, the damper weight 3 is disposed in the bottomed recess 2 of the flywheel 1, but penetrates the flywheel 1 in parallel with the rotation axis O1 of the flywheel 1. A plurality of holes 2 may be formed at equal intervals in the circumferential direction, and the damper weights 3 and the spacers 4 may be arranged in the holes 2 in the same manner as described above.
The same operational effects as those of the above embodiments can be obtained, and the shape of the spacer 4 is smaller than those of the above embodiments, for example, as shown in FIG. 3 or FIG.
It is needless to say that, even when formed in a substantially semicircular shape or a substantially fan-shaped shape as illustrated in FIGS.

Next, in the second embodiment shown in FIG. 5, a plurality of holes 10 penetrating through the flywheel 1 in parallel with the rotation axis of the disc-shaped flywheel 1 are formed at equal intervals in the circumferential direction. And the cylindrical damper weight 3 is provided in the hole 10.
And the spacers 4 are arranged in the same manner as in the above embodiments, and the damper weights 3 and the spacers 4 are arranged.
A disk 11 formed of the oil-impregnated bearing material or the dry friction bearing material is disposed so as to cover and contact both side surfaces of the disk 11, and the outer peripheral surface of the disk 11 is slidable with the inner peripheral surface of the hole 10. Further, sheet metal plugs 13 are driven into both side steps 12 in the hole 10 so as to cover the outer surfaces of the disks 11, and the outer surfaces of the disks 11 are Supports the sides.

Therefore, as in the above embodiments, the damper weight 3 is supported so as to roll freely in the hole 10 and the spacer 4 is slidably held in the hole 10. While the damper weight 3 and the spacer 4
Are slidably supported on both side surfaces by a disk 11, and the disk 11 is supported by the inner peripheral surface of the hole 10 and the inner surface of the plug 13, and is equivalent to each of the above embodiments. In addition to the effects that can be obtained, the plug 13 whose outer peripheral portion is fixed to the step portion 12 reliably prevents the damper weight 3, the spacer 4, and the disk 11 from dropping out of the hole portion 10, and also ensures that the hole 11 There is an advantage that dust such as clutch wear powder can easily be prevented from entering the part 10.

A step 12 is formed at the same time as the disk 11 of the second embodiment is arranged on the opening side of the recess 2 in the first embodiment, and a sheet metal plug 13 is driven into the step 12. Even in such a case, the same operation and effect as those of the second embodiment can be obtained.

In each of the above embodiments, if only the spacer is removed and the recess or the hole is filled with a light liquid such as lubricating oil or silicone oil and sealed, the inside of the recess or the hole of the flywheel can be formed. The damper weights located in the recesses or swingable in the recesses or holes even if light liquid is filled in the recesses or holes, so that torque fluctuations are transmitted from the engine output shaft to the flywheel. Then, the damper weight oscillates on the inner peripheral surface of the recess or the hole, thereby absorbing the torque fluctuation. On the other hand, the liquid does not respond to the sudden movement of the damper weight in the recess or the hole. Due to viscous drag, when the engine is started or stopped, the damper weight may not fall onto the inner surface of the recess or hole due to its own weight and collide. Since it control, or noise is generated by mounting the damper weight, the inner peripheral surface of the surface or recess or hole of the damper weights can be reliably prevented that such deformed or damaged.

[0018]

In the variable speed damper according to the first aspect of the present invention, the damper weight disposed in the concave portion or the hole of the damper body has an outer peripheral surface and an inner peripheral surface of the concave portion or the hole. Are guided so as to roll along the inner peripheral surface of the concave portion or the hole portion by the spacer disposed so as to straddle between the rotary shaft and the damper main body. The above-mentioned torque fluctuation can be absorbed by the weight rolling on the inner peripheral surface of the concave portion or the hole, while the damper weight is formed inside the concave portion or the hole when the rotation shaft starts or stops rotating. Dropping on the peripheral surface can be reliably prevented by the presence of the spacer, and noise is generated by the installation of the damper weight, and the surface of the damper weight and the inner peripheral surface of the recess or hole are damaged. Deform It is possible to prevent the theft.

In the variable speed damper according to the fourth aspect of the present invention, the damper weight disposed in the concave portion or the hole of the damper body is filled with a light liquid inside the concave portion or the hole. However, since it is swingable in the recess or the hole, when torque fluctuation is transmitted from the rotating shaft to the damper body, the damper weight swings on the inner peripheral surface of the recess or the hole, thereby While the torque fluctuation can be absorbed, the drop of the damper weight onto the inner peripheral surface of the recess or the hole at the time of starting or stopping the rotation of the rotating shaft can be suppressed by viscous resistance of the light liquid, It is possible to prevent noise from being generated due to the mounting of the damper weight, and prevent the inner peripheral surface of the concave portion or the hole from being damaged and deformed.

[Brief description of the drawings]

FIG. 1 is a schematic side view of a first embodiment of the present invention.

FIG. 2 is an enlarged longitudinal sectional view taken along the line II-II of FIG.

FIG. 3 is a modified view of a main part of the embodiment.

FIG. 4 is a modified view of a main part of the embodiment.

FIG. 5 is a longitudinal sectional view of a main part according to a second embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 flywheel 2 recess 3 damper weight 4 spacer 5 variable speed damper 10 hole 11 disk 13 plug

Claims (4)

[Claims] 1. A disk-shaped damper body coaxially connected to a rotation shaft, wherein a recess or hole having a circular cross section perpendicular to the rotation axis of the damper body and having a center line parallel to the rotation axis is provided. In a variable speed damper formed and having a columnar damper weight disposed in the recess or hole, the other outer peripheral surface of the damper weight whose outer peripheral surface is in contact with the inner peripheral surface of the concave or hole, Alternatively, a variable-speed damper having a spacer which is disposed so as to straddle with another inner peripheral surface of the hole and guides the rolling of the damper weight along the inner peripheral surface of the recess or the hole. 2. The variable speed damper according to claim 1, wherein at least the inner and outer peripheral surfaces of the spacer are formed of a solid lubricant. 3. The device according to claim 1, wherein the contact surface between the damper weight and the spacer is formed of a solid lubricant and is disposed in the recess or the hole to support a side surface of the damper weight and the spacer. Variable speed damper with a disk. 4. A disk-shaped damper body coaxially connected to a rotation shaft, wherein a recess or hole having a circular cross section perpendicular to the rotation axis of the damper body and having a center line parallel to the rotation axis is provided. A variable speed damper formed and having a columnar damper weight disposed in the recess or hole, wherein a light liquid is filled and sealed in the recess or hole.