JPH0232890Y2 - - Google Patents

Description

[Detailed explanation of the invention] (a) Industrial application field The present invention relates to a mechanism for transmitting power from the crankshaft of an internal combustion engine installed in a vehicle to a transmission input shaft. Specifically, the present invention relates to a torque fluctuation absorbing power transmission mechanism that can absorb torque fluctuations of an internal combustion engine.

(b) Prior art The torque fluctuation absorbing power transmission mechanism as described above is disclosed in Utility Application No. 58-816 (Utility Model Application No. 59-81) by the inventor of the present application.
No. 107350). The torque fluctuation absorbing power transmission mechanism previously proposed by the present inventor includes a clutch disk mounted on a transmission input shaft so as to rotate together with it, and a clutch disk mounted on a crankshaft of an internal combustion engine to rotate together with it. A clutch pressure plate is movable between an engagement position in which the clutch disc is pressed into engagement with a flywheel mounted so that the clutch disc is pressed into engagement with the flywheel, and a release position in which the clutch disc is released from the pressing engagement with the flywheel. and a mass for providing an additional moment of inertia to the transmission input shaft.

The conventional power transmission mechanism described above exhibits an excellent effect in absorbing the fluctuating torque of the internal combustion engine and reducing vibration noise, especially muffled noise at low speeds.

(c) Problems to be solved by the invention However, in the conventional power transmission mechanism described above, the mass body that imparts an additional moment of inertia to the transmission input shaft is Because the clutch was fixedly mounted, another problem that needed to be solved was that the clutch was difficult to disengage. That is, the greater the moment of inertia of the transmission input shaft, the more difficult the clutch will be to disengage, the more difficult it will be to engage a gear during shifting, and the less favorable the shift operation feeling will be.

An object of the present invention is to provide a torque fluctuation absorbing power transmission mechanism that can improve clutch disengagement without losing the effect of reducing torque fluctuations in an internal combustion engine.

(d) Means for solving the problem According to the present invention, the mass body is supported by the clutch pressure plate so as to be relatively rotatable, and the mass body and the transmission/input shaft are supported in a relatively rotatable manner. an auxiliary clutch is disposed at the auxiliary clutch, and when the clutch pressure plate is in the engaged position, the auxiliary clutch is engaged to cause the mass to rotate with the transmission input shaft;
The above problem is also solved by disengaging the auxiliary clutch and separating the mass from the transmission input shaft when the clutch pressure plate is in the released position.

(e) Operation When the clutch pressure plate presses the clutch disk into engagement with the flywheel and the clutch is in the engaged state, the auxiliary clutch is also engaged, thereby causing the clutch pressure plate to rotate relative to the flywheel. The reliably supported mass is caused to rotate together with the transmission input shaft, thereby imparting an additional moment of inertia to the transmission input shaft to reduce torque fluctuations of the internal combustion engine. . Additionally, when the clutch pressure plate releases the clutch disc from pressing engagement with the flywheel, so that the clutch is in the so-called released state, the auxiliary clutch is also released, thereby causing the clutch pressure plate to rotate relative to the flywheel. The possibly supported mass is decoupled from the transmission input shaft, so that the mass does not impart an additional moment of inertia to the transmission input shaft.

(F) Embodiments Hereinafter, embodiments of the present invention will be described with reference to the attached drawings.

1 and 2 show a torque fluctuation absorbing power transmission mechanism according to an embodiment of the present invention, the power transmission mechanism having a clutch generally designated by the reference numeral 10. is a clutch disk 14 mounted on the transmission input shaft 12 to rotate therewith.
1 and the engagement position shown in FIG. A clutch pressure plate 22 is movable in the axial direction of the transmission input shaft 12 between a release position shown in FIG. are doing. In addition, in FIGS. 1 and 2, 24 indicates a clutch cover, and 26
28 indicates the spring of the clutch disk 14, and 28 indicates the clutch hub splined to the transmission input shaft 12. The arrangement of the other components except for the components described above and the components described below is the same as that of a conventional power transmission mechanism having a single flywheel, so a detailed description thereof will be omitted.

The torque fluctuation absorbing power transmission mechanism according to the embodiment of the present invention includes a mass body 3 in the form of a sub-flywheel for imparting a necessary amount of additional moment of inertia to the transmission input shaft 12.
2, and the mass body 32 is supported by a hall bearing 34 to be rotatable relative to the clutch pressure plate 22. The clutch hub 28 and the mass body 3 are also splined to the transmission input shaft 12.
An auxiliary clutch, generally designated 40, is disposed between the auxiliary clutch 2 and the auxiliary clutch 40.
A disc-shaped projection 4 integrally projects radially outward from the outer peripheral surface of the clutch hub 28.
2. It has a lining plate 44 stretched over the disk-shaped protrusion 42, an annular recess 46 provided on the inner circumference of the mass body 32, and a lining plate 48 stretched over the bottom of the annular recess 46. are doing. When the clutch pressure plate 22 is in the engaged position shown in FIG. A mass 32 rotatably supported on the pressure plate 22 is rotated together with the transmission input shaft 12 to provide the required amount of additional moment of inertia to the transmission input shaft 12. It is starting to be granted. Also, when the clutch pressure plate 22 is in the released position shown in FIG. , the mass 32 rotatably supported on the clutch pressure plate 22 is disconnected from the transmission input shaft 12 and thus the mass 3
2 is transmission input shaft 1
2, no additional moment of inertia is applied.

Next, the vibration system of the torque fluctuation absorbing power transmission mechanism according to the embodiment of the present invention will be described with reference to FIGS. 3 and 4.

FIG. 3 shows a modeled state in which the clutch 10 is in the engaged position shown in FIG. 1, and this vibration system has been proven both theoretically and experimentally to have a large vibration damping effect. Japanese Patent Publication No. 50-25907
The vibration model can be simplified to the same vibration model as the two-part flywheel disclosed in the publication. That is, the flywheel 18, the crankshaft 1
6. A so-called engine-side moment of inertia _I1 consisting of a clutch pressure plate 22, a clutch cover 24, and a clutch disk 14, a mass body 32 that provides an additional moment of inertia, a clutch hub 28, and a transmission/input shaft 12. The transmission side moment of inertia _I2 is coupled to the torsion spring 26, and if the spring constant of the spring 26 is K, then the resonance frequency ( ₀ = 1/2π・√( ₁ + ₂ )
Even if a vibration with a frequency higher than (I ₁ / I ₂ ) is applied to the I ₁ side, the vibration is difficult to be transmitted to the I ₂ side. It has been pointed out that it is necessary to select K, I ₁ and I ₂ such that the above ₀ can be set sufficiently lower (preferably 1/√2 or less) than the primary explosion frequency at engine idle speed. That's right.

As mentioned above in (c) Problems to be Solved by the Present Invention, it is assumed that the mass body 32 is fixedly mounted on the clutch hub 28 which is spline-engaged with the transmission input shaft 12. If so, the additional moment of inertia imparted by the mass body 32 will make it difficult for the clutch 10 to disengage, making it difficult to engage a gear during a shift, and resulting in an unfavorable shift operation feeling.

In contrast, in the embodiment of the present invention, the mass body 32 is rotatably supported by the clutch pressure plate 22 by a bearing 34, and an auxiliary clutch 40 is disposed between the clutch hub 28 and the mass body 32. As shown in FIG. 2, when the clutch 10 is in the disengaged position, the clutch pressure plate 22
As the clutch moves away from the flywheel 18, the auxiliary clutch 40 is also disengaged and the mass 32 does not apply any rotational force to the clutch hub 28. The vibration model system in this state is as shown in Figure 4, with I ₁ and I ₂ completely separated,
No resonance will occur, and the transmission input shaft 12 will no longer continue to rotate meaninglessly for a long period of time due to the influence of _I2 .

(g) Effects of the invention In the torque fluctuation absorbing power transmission mechanism according to the invention, when the clutch pressure plate 22 is in the engaged position, the auxiliary clutch 40 is engaged, thereby causing the mass body 32 to move toward the transformer. Since it is configured to rotate together with the transmission input shaft 12, when the so-called clutch 10 is ON, the torque fluctuation reduction effect by the mass body 32 is fully exhibited, and the clutch pressure plate 22 When the clutch 40 is in the released position, the auxiliary clutch 40 is also disengaged and is configured to disconnect the mass 32 from the transmission input shaft 12, so that the so-called clutch 1
When 0 is OFF, the additional moment of inertia due to the mass body 32 is not applied to the transmission input shaft 12, the disengagement of the clutch 10 is improved, and the conventional general power transmission mechanism without the mass body 32 is improved. The same shift feeling as in the case of 2 is obtained, thereby making it possible to prevent shift errors.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of the torque fluctuation absorbing power transmission mechanism according to the embodiment of the present invention, showing the state in which the clutch is placed in the engaged position, and FIG.
This is a cross-sectional view similar to that shown in the figure, but showing a state in which the clutch is placed in the released position, and Fig. 3 is a model of the vibration system of the power transmission mechanism in the state shown in Fig. 1. FIG. 4 is a schematic diagram showing a model of the vibration system of the power transmission mechanism in the state shown in FIG. 2. 10...Clutch, 12...Transmission/input shaft, 14...Clutch disk, 16...Crankshaft, 18...Flywheel, 22...Clutch pressure plate, 32...Mass body, 40 ...Auxiliary clutch.

Claims (1)

[Claims for Utility Model Registration] A clutch disk mounted on a transmission input shaft so as to rotate therewith, and a flywheel mounted on a crankshaft of an internal combustion engine so as to rotate together therewith. a clutch having a clutch pressure plate movable between an engagement position in which the clutch disk is pressed into engagement and a release position in which the clutch disk is released from pressing engagement with the flywheel; A torque fluctuation absorbing power transmission mechanism comprising a mass body for imparting an additional moment of inertia to the input shaft, wherein the mass body is supported by the clutch pressure plate so as to be relatively rotatable, and , an auxiliary clutch is disposed between the mass and the transmission input shaft;
When the clutch pressure plate is in the engaged position, the auxiliary clutch is engaged to cause the mass to rotate with the transmission input shaft, and the clutch pressure plate is in the engaged position. The torque fluctuation absorbing power transmission mechanism according to claim 1, wherein when the auxiliary clutch is in the disengaged position, the auxiliary clutch is disengaged to separate the mass body from the transmission input shaft.