JP3476342B2 - Variable speed 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 constant order dynamic damper, that is, a variable speed damper provided on a flywheel or the like for reducing torque fluctuations of an engine output shaft and the like.

[0002]

2. Description of the Related Art A conventional variable speed damper is an actual flat type 1-
As disclosed in Japanese Patent No. 115039, a simple pendulum is arranged in each of a plurality of recesses provided in a flywheel, and a bolt serving as a swing center axis of the simple pendulum is screwed into a bottom surface of the flywheel recess. However, in this case, it is necessary to process a screw hole on the bottom surface of the flywheel recess, and while the number of processing steps increases, the single pendulum is locally supported by the screw hole of the flywheel via the bolt, The load concentrates around this screw hole, and therefore, in order to secure the strength around the screw hole, it is necessary to increase the thickness of the flywheel, etc., which increases the weight and cost of the variable speed damper. There is a problem that invites.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to reduce the cost of a variable speed damper by reducing the load acting on the damper main body such as a flywheel due to the swinging motion of the pendulum.

[0004]

Therefore, in the variable speed damper according to the first aspect of the present invention, the variable speed damper is coaxially connected to the rotary shaft, has a circular cross section perpendicular to the rotary shaft center, and has a center line as described above. The disk-shaped damper body has a recess or hole formed parallel to the axis of rotation, and a pendulum assembly fitted and fixed in the recess or hole of the damper body. When the cylindrical case and the pendulum assembly housed in the case are fitted and fixed in the recess or hole, the case is supported by the case so as to be swingable around the center line, and the position of the center of gravity is eccentric from the center line. It is equipped with a pendulum.

That is, since the pendulum assembly is fitted and fixed in the recess or hole of the damper body, and the pendulum housed in the case of the pendulum assembly is swingably supported by the case, the pendulum swings. The load generated by is supported by the inner surface of the recess or the hole of the damper body via the outer peripheral surface of the case, so that the load is not locally concentrated on the damper body.

In the variable speed damper according to the second and third aspects of the present invention, the pendulum assembly has a lid member for closing the opening side of the case.

Therefore, when the pendulum assembly is fitted and fixed in the recess or hole of the damper body, or when the pendulum assembly is used as a variable speed damper, it is possible to prevent dust or the like from entering the case of the pendulum assembly. The sensitive swing characteristic of the pendulum can be secured.

Further, in the variable speed damper according to the fourth aspect of the present invention, the variable speed damper is coaxially connected to the rotary shaft, has a circular cross section perpendicular to the rotary shaft center, and has a center line parallel to the rotary shaft center. It has a disk-shaped damper body having a bottom recess and a pendulum assembly fitted and fixed in the recess of the damper body. The pendulum assembly is housed in the bottomed cylindrical case and the same. When the pendulum assembly is fitted and fixed in the recess, the pendulum is swingably supported around the center line and is supported by the case, and the center of gravity is deviated from the center line. The bottom of the case is located.

Therefore, like the variable speed damper described in claim 1, since the pendulum housed in the case of the pendulum assembly is swingably supported by the case, the load generated by the swing of the pendulum is Since it is supported by the inner surface of the recess of the damper main body through the outer peripheral surface of the case, the load is not locally concentrated on the damper main body, and the bottom of the case is arranged on the opening side of the bottomed recess. Because
The case bottom can function as a lid member for the inside of the case, prevent dust and the like from entering the case, and ensure a sensitive swing characteristic of the pendulum.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION In the following, with reference to the embodiments of the present invention shown in the drawings, the same reference numerals are respectively attached to the equivalent parts of the respective embodiments. 1 and 2, a plurality of, for example, six bottomed recesses 2 are formed at equal intervals in the circumferential direction on the side surface of a disc-shaped flywheel 1 that is coaxially connected to an output shaft of a diesel engine. Each of the recesses 2 has a circular cross section perpendicular to the rotational axis O1 of the flywheel 1, and its center line O2 is parallel to the rotational axis O1.

A pendulum assembly 10 is fitted and fixed in each recess 2 by a method such as press fitting or cold fitting. The pendulum assembly 10 has a bottomed cylindrical shape and its outer peripheral surface is substantially the same as the inner peripheral surface of the recess 2. Case 11 that abuts the entire surface, and case 11
The lid member 13 includes a pendulum 12 which is housed inside and has a substantially semicircular cross section in a direction perpendicular to the center line O2, and a lid member 13.
Is fitted into an annular recess 14 formed at the opening edge of the case 11 and fixed to the opening edge of the case 11 by a suitable number of screws 15 to close the opening side of the case 11.

The pendulum 12 has projections 1 on both side surfaces.
6 is integrally formed, or both ends of a round bar member which is inserted into the pendulum 12 and fixed to the pendulum 12 are protruded to both side surfaces of the pendulum 12 to form protrusions 16, and end faces of the protrusions 16 are formed. The shaft portions 17 formed in the case 11 and the lid member 13 are embedded in the case 11 and the lid member 13, respectively.
Is rotatably supported by a cylindrical bearing member 18 arranged with the axis as an axis, and the end surface of the protrusion 16 is in contact with the end surface of the bearing member 18.

As a result, the pendulum 12 is swingably supported by the bearing member 18 around the center line O2 of the recess 2, and the center of gravity G of the pendulum 12 is set at a position deviated from the center line O2. The flywheel 1 and each pendulum assembly 10 constitute a variable speed damper 20.

That is, when the flywheel 1 rotates about the rotation axis O1 by the rotation of the output shaft of the diesel engine, the pendulums 12 in the pendulum assemblies 10 that receive the centrifugal force rotate about the center line O2. When the torque fluctuation is transmitted from the diesel engine output shaft to the flywheel 1 in this case, the pendulum 12 is moved to the center of gravity G.
Can swing in the case 11 at a position deviated from the center line O2 of the recess 2, so that the distance between the rotation axis O1 of the flywheel 1 and the center line O2 of the recess 2 and the center line O2 of the recess 2 By appropriately selecting the distance from the center of gravity G of the pendulum 12 and the mass of the pendulum 12, the constant order angular acceleration based on the torque fluctuation of the diesel engine output shaft is effectively reduced and the above torque fluctuation is suppressed. You can

Further, a case 11 of the pendulum assembly 10
The pendulum 12 is housed in the pendulum 12, and the load caused by the swinging of the pendulum 12 is supported by the inner peripheral surface of the recess 2 via the case 11 and the lid member 13, that is, in a relatively large area in the recess 2. Since the load is supported, a large load is not locally applied to the flywheel 1. Therefore, it is not necessary to particularly increase the strength of the flywheel 1. Therefore, the weight of the flywheel 1 and the manufacturing cost thereof can be reduced. Can be easily realized.

Furthermore, each pendulum assembly 10 can be prefabricated separately from the flywheel 1, and by fitting the unitized pendulum assembly 10 into each recess 2 of the flywheel 1, Since the variable speed damper 20 can be configured, not only the productivity of the pendulum assembly 10 can be easily increased, but also the work of assembling the pendulum assembly 10 into the recess 2 of the flywheel 1 is simple, From these points as well, the manufacturing cost of the variable speed damper 20 can be reduced.

Moreover, the pendulum assembly 10 is the case 1
When the pendulum assembly 10 is assembled into the recess 2 of the flywheel 1 and is used as the variable speed damper 20, etc.
Since dust and the like are surely prevented from entering the case 11, the sensitive swing characteristic of the pendulum 12 in the case 11 can be ensured, and the variable speed damper 20 is always effective for torque fluctuation. Can be suppressed.

In the pendulum assembly 10, both shaft portions 17 of the pendulum 12 are rotatably supported by bearing members 18 embedded in the case 11 and the cover member 13, respectively, and the pendulum 12 is supported by the case 11 and the cover member 13. Since both ends are supported, even if the pendulum 12 swings with a large acceleration, the load caused by the swing can be easily supported by the case 11 and the lid member 13.

Further, in the above embodiment, the pendulum assembly 10 is arranged in the bottomed recess 2 of the flywheel 1, but a plurality of pendulum assemblies penetrating the flywheel 1 in parallel with the rotational axis O1 of the flywheel 1 are provided. Even if the holes are formed at equal intervals in the circumferential direction and the pendulum assembly 10 is fitted and fixed in the holes, the same effect as that of the above-described embodiment can be obtained.

In each of the above embodiments, the opening edge of the case is closed by the flat plate-like lid member, but as shown in FIG. 3, the same bottomed cylindrical case 30 is assembled face to face, By connecting those opening edges with an appropriate number of screws 31, the pendulum assembly 10 in which the pendulum 12 housed therein is swingably supported is connected to the recess of the flywheel as in the case of each of the above embodiments. Even if they are fitted and fixed in the holes, the same effects as those of the above-described respective embodiments can be obtained, and the cost of the pendulum assembly 10 is further reduced by using the case 30 as a lid member. You can

The pendulum housed in the case of the pendulum assembly 10 is a disc having a circular cross section at a right angle to the center line O2 of the recess 2 or hole of the flywheel 1, The position of the center of gravity G is changed by a concave portion or a hole portion which is appropriately biased so as to extend parallel to O2, or a hollow portion which is biased inside, or by partially changing the thickness or the material. Oscillate about the center line O2 in the case by an annular ball bearing, roller bearing, bearing material, etc., which is largely deviated from the center line O2 and is arranged between the inner peripheral surface of the case and the outer peripheral surface of the pendulum. The pendulum is configured to be freely supported, or the pendulum shaft is cantilevered at a substantially central position of the case so that the mass of the pendulum is unevenly distributed on the inner peripheral surface side of the case so that the center of gravity G is located at the center line O2. To be greatly biased from Even if configured, the same operational effects as those of the above-described respective embodiments can be obtained.

Further, the pendulum is particularly disc-shaped as described above, or cantilevered by a case, and
The pendulum assembly 10 is a bottomed recess 2 of the flywheel 1.
Pendulum assembly 1 when fitted and fixed inside
The lid member at 0 is omitted, and the case 1 is provided on the opening side of the recess 2.
If the bottom portion of the case 1 is arranged, the bottom portion of the case 11 can function as a lid member for the inside of the case 2, and it is possible to prevent dust and the like from entering the case 2. The pendulum assembly 1 can secure the sensitive swinging characteristics of the pendulum, and the variable speed damper can always effectively suppress the torque fluctuation, and the number of parts and the number of assembling steps can be reduced.
Cost reduction of 0 can be achieved.

[0023]

In the variable speed damper according to the first aspect of the present invention, the pendulum housed in the case of the pendulum assembly is swingably supported by the case, and the load generated by the swing of the pendulum is It is not necessary to increase the strength of the flywheel because it is possible to easily avoid local concentration of load on the damper body, which is supported by the inner surface of the recess or hole of the damper body via the outer peripheral surface of the case. Therefore, the weight of the flywheel and the manufacturing cost can be reduced, and the pendulum assembly is prefabricated separately from the flywheel, and the pendulum assembly is fitted and fixed in the recess or hole of the flywheel. As a result, the variable speed damper can be configured, so that the productivity of the pendulum assembly can be easily increased. Ride without becomes also the assembly operation of the pendulum assembly easier for the flywheel, it is possible to also reduce the manufacturing cost of a variable speed damper from these planes.

In the variable speed damper according to the second and third aspects of the present invention, when the pendulum assembly is fitted and fixed in the recess or hole of the damper main body, or as a variable speed damper. When used, there is an advantage that dust and the like can be prevented from entering the case of the pendulum assembly, the swing characteristic of the pendulum can be secured, and torque fluctuation can be effectively suppressed as a variable speed damper.

Further, in the variable speed damper according to claim 4 of the present invention, the load generated by the swing of the pendulum is supported on the inner surface of the recess of the damper main body through the outer peripheral surface of the case, and the damper is Since it is possible to easily avoid locally concentrating the load on the main body, it is not necessary to particularly increase the strength of the flywheel, the weight of the flywheel can be reduced, the manufacturing cost can be reduced, and the pendulum assembly can be achieved. Is prefabricated separately from the flywheel, and the variable speed damper can be configured by fitting and fixing the pendulum assembly in the recess of the flywheel, so the productivity of the pendulum assembly can be easily increased. Not only can it be done, but the work of assembling the pendulum assembly to the flywheel is also easy,
From these aspects as well, it is possible to reduce the manufacturing cost of the variable speed damper, and moreover, the bottom part of the case can function as a lid member for the inside of the case, which can reduce the number of parts and at the same time. As a variable speed damper, the torque fluctuation can be effectively suppressed at all times by preventing dust and the like from entering the inside of the pendulum to secure the rocking characteristic of the pendulum.

[Brief description of drawings]

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

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

FIG. 3 is an enlarged view of a vertical cross section of a main part in another embodiment of the present invention.

[Explanation of symbols]

1 flywheel 2 recess 10 Pendulum assembly 11 cases 12 pendulum 13 Lid member 17 Shaft 18 Bearing material 20 Variable speed damper 30 cases

Front page continuation (58) Fields surveyed (Int.Cl. ⁷ , DB name) F16F 15/14 F16F 15/30 F16F 15/31

Claims (4)

(57) [Claims] 1. A disk-shaped damper body, which is coaxially connected to a rotary shaft, has a circular cross section perpendicular to the rotary shaft center, and has a recess or hole whose center line is parallel to the rotary shaft center, and the damper. A pendulum assembly fitted and fixed in the recess or hole of the main body, wherein the pendulum assembly is housed in the bottomed cylindrical case, and the pendulum assembly is fitted in the recess or hole. A variable-speed damper having a pendulum, which is supported by the case so as to be swingable around the center line when fixed and fixed, and has a center of gravity deviated from the center line. 2. The variable speed damper according to claim 1, wherein the pendulum assembly includes a lid member that closes an opening side of the case. 3. The variable speed damper according to claim 2, wherein the pendulum is supported at both ends by the bottom portion of the case and the lid member. 4. A disk-shaped damper main body, which is coaxially connected to the rotary shaft, has a circular cross section perpendicular to the rotary shaft center, and has a bottomed recess whose center line is parallel to the rotary shaft center, and the damper main body. A pendulum assembly fitted and fixed in the recess of
The pendulum assembly is a bottomed cylindrical case, and is housed in the same case. When the pendulum assembly is fitted and fixed in the recess, the pendulum assembly is supported by the case so as to be swingable around the center line, and the center of gravity is A variable speed damper having a pendulum that is eccentric from the center line, and the bottom of the case is disposed on the opening side of the recess.