JPS6311407Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a flywheel with a damper used to reduce vibrations caused by torque fluctuations in the crankshaft of an internal combustion engine.

[Prior Art] Conventionally, in an internal combustion engine mounted on a shaft vehicle, etc., the generated torque fluctuates in various ways even within one cycle, and vibrations occur due to this torque fluctuation.
This causes so-called muffled sounds. In order to reduce this muffled noise, it is sufficient to buffer torque fluctuations to prevent the occurrence of vibrations, and various flywheels have been proposed to achieve this objective. For example, there are methods in which an elastic material is interposed between the drive side flywheel and the driven side flywheel to obtain a damper effect using this elastic material (for example, Japanese Patent Publication No. 18049/1983), and there are also cases where the flywheel and the elastic A planetary gear device for speed reduction is interposed between the
This planetary gear device improves the damper effect. In addition, there is a method in which both flywheels are elastically connected in the circumferential direction by an elastic belt that bends in the radial direction (for example, Japanese Patent Laid-Open No. 109844/1983), and There is also one in which both flywheels are elastically connected in the circumferential direction by an extending elastic band (Japanese Utility Model Publication No. 59-3046).

[Problems to be solved by the invention] However, in the above-mentioned Japanese Patent Publication No. 57-18049, an effective damping effect cannot be obtained due to reasons such as the displacement stroke of the elastic material not being sufficiently large, or a sufficient damping effect cannot be obtained. If you try to ensure a long stroke, there are problems such as increasing the size of the flywheel, and in the case of planetary gears, the structure becomes complicated due to the use of a gear mechanism, and secondary vibrations due to backlash of the gears etc. There is a problem that occurs. Also, JP-A-55-
In the case of No. 109844 and Utility Model Application Publication No. 59-3046, when relative torsion occurs between the driving side flywheel and the driven side flywheel, the elongation of the elastic band becomes too large and the elastic band A problem arises in the durability of

An object of the present invention is to provide a flywheel with a damper that has a simple configuration, has a greater effect of reducing vibrations due to torque fluctuations, and can improve the durability of the elastic band.

[Means for Solving the Problems] According to the present invention, the above problems are solved or alleviated by the following damper-equipped flywheel.
That is, the driving side flywheel and the driven side flywheel are arranged so that their rotational axes coincide with each other and are relatively rotatable, and the flywheel extends parallel to the rotational axis of the flywheel between the mutually opposing surfaces of both flywheels. A pair of support members are provided, one of the pair of support members is supported by the drive side flywheel and the other is supported by the driven side flywheel so as to be rotatable around the rotation axis of each support member, At least one of the supporting members is arranged such that the longitudinal axis of the at least one supporting member and the rotational axis of the at least one supporting member are eccentric in the flywheel radial direction, and the pair of supporting members is arranged so that a torque is applied to the flywheel. 1. A flywheel with a damper, characterized in that elastic bands are wound around the pair of support members, the elastic bands being arranged at intervals in the radial direction of the flywheel when the damper is not applied.

[Function] In the damper-equipped flywheel of the present invention having such a configuration, the damper effect is obtained by the expansion and contraction of the elastic band, but at least one of the paired support members around which the elastic band is wound is aligned with the longitudinal axis. Since it is rotatably attached to one of the flywheels eccentrically from the rotation axis, when torque is applied to the flywheel and the drive side and driven side flywheels are twisted, the support member rotates. It can rotate around the axis and reduce the apparent spring constant of the elastic band. This allows the relative torsional rigidity of both flywheels to be lowered, making it possible to effectively reduce vibrations caused by torque fluctuations.

[Embodiments] Hereinafter, preferred embodiments of the damper-equipped flywheel according to the present invention will be described with reference to the drawings.

A drive-side flywheel 3 is fixed to a crankshaft 1 of an internal combustion engine by a set bolt 2, and a driven-side flywheel 4 is disposed at a position facing the drive-side flywheel 3 in the axial direction. The driven flywheel 4 is rotatably engaged with the drive flywheel 3 via a bearing 5, and both flywheels 3 and 4 share a common rotational axis 6 (hereinafter referred to as the flywheel rotational axis) that is aligned with each other. ). 7 is an oil seal ring interposed between the flywheels 3 and 4, and 8 is an input shaft of the transmission. Further, an oil seal ring 9 is also interposed between the input shaft 8 and the driven flywheel 4.

On the drive side flywheel 3, pins 10, 10, . Frame-shaped link members 11, 11, . . . are integrally fixed to one ends of the members 10, . A washer 12 is interposed between the link member 11 and one side surface 3a of the drive side flywheel 3, and a pin 10
The nut 13 and the drive side flywheel 3 are screwed together.
A washer 14 is interposed between the other side surface 3b and the other side surface 3b. And a frame-shaped link member 11
A support member 15 extending parallel to the flywheel rotation axis 6 is fixedly supported on each of the support members 1 and 1.
A washer 16 is loosely fitted in each of the parts 5.
With this structure, the support member 15 is rotatable about the center of the pin 10, and the support member 15
The longitudinal axis of the flywheel itself and the rotational axis of the support member 15 (the center of the pin 10) are eccentric in the flywheel radial direction.

On the other hand, pins 17, 17, . pin 17,
Large diameter portions 17a, 17a, . . . are provided at one end of 17, .
... are formed respectively. Washers 18 are interposed between the large diameter portion 17a and one side 4a of the driven flywheel 4, and between a nut 19 screwed onto the pin 17 and the other side 4b of the driven flywheel 4. A washers 20 are interposed in each case. Then, the large diameter portion 17a of the pin 17
Support members 21 extending parallel to the flywheel rotational axis 6 are planted and fixed at eccentric positions from the pin 17, and retaining members 22 are fitted to the ends of the support members 21, respectively. There is. With this structure, the support member 21 is rotatable about the center of the pin 17, and the longitudinal axis of the support member 21 itself and the rotation axis of the support member 21 (pin 1
7) is eccentric in the flywheel radial direction.

That is, the support members 15 and 21 are aligned in the flywheel radial direction when no torque is applied to the flywheel, form a pair with each other, and support member 1
5 is rotatable around the pin 10, and the support member 21 is rotatable around the pin 17. An annular elastic band 23 is wound around the washer 16 loosely fitted to the support member 15 and the support member 21.

The action will be explained below.

When there is no torque fluctuation of the crankshaft 6, the rotational force of the crankshaft 6 is transmitted to the driven flywheel 4 via the drive side flywheel 3, the support member 15, the elastic band 23, and the support member 21, and
In the figure, both flywheels 3,
4 rotates integrally.

When a torque fluctuation occurs on the crankshaft 6, the phases of both flywheels 3 and 4 are shifted, so that the pin 17 is rotationally displaced relative to the pin 10, and moves to the position of the pin 17' in FIG. 4. In the figure, A indicates the relative rotation direction. As a result, the link member 11 is rotationally displaced to the position 11' due to the tension of the elastic band 23, and the large diameter portion 17a is also rotated to the position 17'.
Since the elastic band 23 is rotationally displaced to the position a, the elastic band 23 is rotationally displaced to the position 23' while being expanded. 15' and 21' are the supporting members 15,
21 position is shown. Here, the supporting members 15, 21
are attached to both flywheels 3 and 4 in a state where they cannot rotate eccentrically, the support member 15 is at the position 15 because it cannot be rotated to the position 15'; Part 2
1 cannot be rotated to the position 21', so 2
1" position. Therefore, the elastic band 2
3 is located at 23'' in the same figure, and 2
It receives a large tensile force compared to when it is at the 3' position.

That is, the support member 1 has the elastic band 23 eccentrically centered around the rotation axis so as to be freely rotatable around the rotation axis.
In the flywheel of the present invention in which the support members 15 and 21 are wound around the support members 15 and 21, the tensile force of the elastic band 23 is smaller for the same relative rotation angle of the flywheel than in a flywheel in which the support members 15 and 21 cannot be rotated eccentrically. Therefore, the apparent spring constant of the elastic band 23 becomes smaller, and the torsional rigidity between the drive-side flywheel 3 and the driven-side flywheel 4 is reduced. In FIG. 5, reference numeral 24 represents a diagram representing the relationship between the torque T and the torsion angle φ when the support members 15 and 21 cannot be eccentrically rotated.
5 and 21 are both supported eccentrically rotatably. In the above embodiment, both the support members 15 and 21 are supported eccentrically, but only one of the support members 15 and 21 is supported eccentrically, and the other is eccentrically rotatably supported. It is also possible to make it impossible. The relationship between the torque T and the torsion angle φ in this case is represented by a diagram 26.

Further, when the support members 15 and 21 are at the positions 15' and 21' in FIG. 4, the elastic band 23 is engaged with the support member 15 via the rotatable washer 16, so the elastic band The tensile forces on the left and right sides of 23' are equal in magnitude.

[Effects of the invention] According to the damper-equipped flywheel of the present invention, when the driving side flywheel and the driven side flywheel are relatively rotationally displaced, at least one of the pair of supporting members around which the elastic band is wound rotates eccentrically. Since the flywheels move, it is possible to reduce the torsional rigidity of both flywheels, and in particular, it is possible to sufficiently reduce vibrations at low rotation speeds and under heavy loads, where the torque fluctuations of the internal combustion engine are large.

Therefore, it is possible to effectively eliminate so-called muffled noise when starting a vehicle or the like.

Furthermore, since the damper action is obtained by the elastic band, the structure is simple and the generation of secondary vibrations can be eliminated.

[Brief explanation of drawings]

FIG. 1 is a front view with a notch of a flywheel with a damper according to the present invention, FIG. 2 is a sectional view taken along the - line in FIG. 1, and FIG. 3 is an enlarged sectional view of the main part of FIG. FIG. 4 is a schematic front view for explaining the principle of the present invention, and FIG. 5 is a diagram showing the relationship between torque T and torsion angle φ. 1...Crankshaft, 2...Set bolt, 3...
... Drive-side flywheel, 4... Drive-side flywheel, 5... Bearing, 6... Flywheel rotation axis, 7, 9... Oil seal ring, 8... Transmission input shaft, 10,
17...Pin, 11...Link member, 12,1
4, 18, 20... Washer, 13, 19... Nut, 15, 21... Support member, 16... Washer, 17a... Large diameter portion, 22... Removal prevention member,
23...Elastic band.

Claims (1)

[Claims for Utility Model Registration] (1) A drive-side flywheel and a driven-side flywheel are arranged so that their rotation axes coincide with each other and are relatively rotatable, and the flywheel is arranged between mutually opposing surfaces of both flywheels. A pair of support members is provided that extends parallel to the rotation axis of the wheel, and one of the pair of support members is used as a driving flywheel and the other is a driven flywheel that rotates around the rotation axis of each support member. at least one of the pair of support members is eccentrically supported in the flywheel radial direction, with the longitudinal axis of the at least one support member and the rotational axis of the at least one support member being eccentric in the flywheel radial direction; The supporting members are arranged at intervals in the flywheel radial direction when no torque is applied to the flywheel,
A flywheel with a damper, characterized in that an elastic band is wound around the pair of support members. (2) A flywheel with a damper according to claim 1, wherein a plurality of pairs of supporting members are arranged in a circumferential direction around the rotational axis of the flywheel.