JPH0131802Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a variable speed dynamic damper used for reducing rotational fluctuations in torque transmission systems of automobiles, etc., and particularly relates to a variable speed dynamic damper having roller weights. It is something.

A variable speed dynamic damper that has a roller weight inside the flywheel reduces rotational fluctuations in the torque transmission system by the dynamic damper effect that utilizes the rolling motion of the roller weight, but as a damping component, There is a component due to the movement of the rollers, and a component due to the rotation of the rollers. Among these components, if slip occurs between the rollers and the rolling surface, the component due to the rotation of the rollers will not work as a damping component, so there is a problem that the damping effect will be reduced accordingly. arise.

In conventional roller-type variable speed dynamic dampers, the roller-type weight is usually configured in a cylindrical shape. Therefore, the frictional force between the roller weight and the rolling surface is not so large, and at a relatively large amplitude, slipping occurs between the roller weight and the rolling surface, causing rotational fluctuations in the damper as a whole. There was a problem that the reduction effect was not sufficient.

In order to solve the above problem, the present invention increases the frictional force between the roller weight and the rolling surface, and exhibits a good dynamic damper effect without causing slip even at large amplitudes. With the goal.

The variable speed dynamic damper of the present invention that meets this purpose is a variable speed dynamic damper that has a roller weight inside the flywheel, and the cross section of the rolling surface on which the roller weight rolls is V.
It consists of something shaped like a letter.

In such a variable speed dynamic damper, the rolling surface is formed in a V-shape, so
Roller weights roll by centrifugal force so that they sink into the rolling surface. Therefore, the frictional force between the roller weight and the rolling surface becomes large, and slippage is prevented and the roller weight rotates reliably.
As a result, both the damping component due to the rotation of the roller weight and the damping component due to the movement work effectively, and the targeted dynamic damper effect can be reliably obtained. Particularly in the case of a large amplitude, the slip prevention effect is large and a good rotation fluctuation reduction effect can be obtained.

Preferred embodiments of the variable speed dynamic damper of the present invention will be described below with reference to the drawings.

1 and 2 show a variable speed dynamic damper according to an embodiment of the present invention.
In the figure, 1 is a flywheel, and the flywheel 1 is connected to an input shaft 2 of a torque transmission system, for example, a crankshaft of an engine. An appropriate number of roller weights 3 are provided inside the flywheel 1 so as to be freely rotatable. Roller weight 3
are provided at equal pitches in the circumferential direction and housed in an annular space 4 formed within the flywheel 1. The outer peripheral side surface of the space 4 is formed on the rolling surface 5 of the roller type weight 3, and the rolling surface 5
is formed in an arc shape at a position corresponding to the roller weight 3.

As shown in FIG. 1, the rolling surface 5 has a cross-shaped cross section. In the cross section of the roller type weight 3, the outer circumferential surface 6 is formed in a V-shape, and the V-shape of the outer circumferential surface 6 and the V-shape of the rolling surface 5 are formed at the same angle, and the V-shaped surface of the outer circumferential surface 6 and the V-shape of the rolling surface 5 are formed at the same angle. It is in surface contact with the V-shaped surface of the moving surface 5.

Note that 7 is a cover for holding the roller weight 3 in the space 4, and is fixed with bolts 8. A clearance is provided between the side surface of the cover 7 and the roller type weight 3 and the inner surface of the flywheel 1 and the side surface of the roller type weight 3 to the extent that movement and rotation of the roller type weight 3 is not hindered.

In the variable speed dynamic damper configured as described above, the roller weight 3 moves along the arcuate rolling surface 5 inside the flywheel 1, and moves dynamically by rolling and rotating. A damper effect is exerted. Roller weight 3
is pressed against the rolling surface 5 by centrifugal force while the flywheel 1 is rotating, but since the rolling surface 5 has a V-shaped cross section, the V-shaped outer periphery of the roller weight 3 The surface 6 is pressed so as to sink into the rolling surface 5. Therefore, roller weight 3
The frictional force between the outer circumferential surface 6 and the rolling surface 5 is significantly increased compared to the conventional case of contact between the cylindrical outer circumferential surface and a flat surface. The increase in frictional force prevents slipping when the roller weight 3 rolls, and the roller weight 3 moves along the rolling surface 5 while rotating reliably against rotational fluctuations of the flywheel 1. As a result, the damping component due to the rotation of the roller weight 3 is prevented from decreasing in the event of slipping, and a good dynamic damper effect is exhibited in combination with the damping component due to the movement. Particularly in the case of large-amplitude rotational fluctuations, slips tend to occur in the past and there is a risk that the dynamic damper effect may not be fully exerted. The target rotational fluctuation reduction effect can be reliably achieved.

In addition, since the V-shaped cross section of the roller weight outer circumferential surface 6 fits into the V-shaped cross section of the rolling surface 5, the axial wobbling of the roller weight 3 is naturally controlled by centrifugal force. In the case of a cylindrical roller weight, the side guide made of solid lubricant or the like provided on the inner side of the housing is no longer necessary.

Next, FIGS. 3 to 6 show other embodiments regarding the shapes of the roller type weight and the rolling surface.

In the device shown in FIG. 3, the rolling surface 9 is formed in an oblique V-shape, and the outer peripheral surface 11 of the roller weight 10 is formed in a conical surface. In the device shown in FIG. 4, the rolling surface 12 is formed in an inverted V shape, and the outer peripheral surface 14 of the roller weight 13 is formed in a V groove. In the device shown in FIG. 5, the rolling surface 15 is formed in a plurality of V-grooves, and the outer peripheral surface 17 of the roller weight 16 is also formed in a plurality of V-grooves. By providing a plurality of V-grooves in this manner, the difference in circumferential speed between the contact portion of the roller weight 16 with a small radius and the contact portion with a large radius in the contact between the roller weight 16 and the rolling surface 15 is reduced. , the rolling of the roller weight 16 is made smoother. In the device shown in Fig. 6, the flywheel 1
The cross-sectional shape of the rolling surface 18 is formed into a rectangular shape, and each part of the rolling surface 18 is in line contact (or point contact) with the outer circumferential surface 20 formed in the V groove of the rolling weight 19. Flywheel 1 like this
It is not necessary that both of the outer circumferential surfaces as the rolling surfaces of the side rolling weight are V-shaped, as long as one of them is V-shaped, and only one of them is V-shaped. Frictional force is improved and slips are prevented. Other configurations and operations are similar to those of the previous embodiment.

As explained above, when using the variable speed dynamic damper of the present invention, the cross section of the rolling surface is
Since the roller type weight is formed in a letter shape to increase the frictional force between the roller type weight and the rolling surface, slipping of the roller type weight can be prevented and the damping component due to the rotation of the roller type weight can be fully exerted. This results in the effect that the dynamic damper effect can be fully exhibited and the rotational fluctuation reduction effect can be improved. In particular, even in the case of large amplitudes, it is possible to prevent slips that tend to occur in the past, and to obtain a good dynamic damper effect.

[Brief explanation of the drawing]

Fig. 1 is a side view showing the right half of a variable speed dynamic damper according to an embodiment of the present invention in cross section, and Fig. 2 is a front view showing the inside of the cover of only the right half of the device shown in Fig. 1. 3 is a partial sectional view showing another embodiment, FIG. 4 is a partial sectional view showing still another embodiment, FIG. 5 is a partial sectional view showing still another embodiment, and FIG. 6 is a partial sectional view showing still another embodiment. It is a partial sectional view showing still another example. 1... Flywheel, 3, 10, 13, 1
6, 19...Roller type weight, 5, 9, 12, 1
5, 18...Rolling surface, 6, 11, 14, 17, 2
0...Outer peripheral surface of roller weight, 7...Cover.

Claims (1)

[Scope of utility model registration request] 1. A variable speed dynamic damper having a roller weight inside a flywheel, characterized in that a rolling surface on which the roller weight rolls has a V-shaped cross section.