JPH0211639Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to the improvement of torsional dampers, and more specifically, torsional dampers that suppress torsional vibrations generated in rotating shafts, with improved vibration damping properties and stable transmission of rotational motion. It is configured so that it can be done.

As shown in FIG. 1, a conventional torsional damper of this type has a vibration ring 3 externally fitted onto the outside of a hub 1 via an annular rubber 2, and a substantially V-shaped groove 3 provided in the vibration ring 3. ’ belt (not shown)
A mass pulley type device is known that transmits the rotational motion of a rotating shaft (not shown) to another device by using a rotating shaft (not shown). However, in such a conventional torsional damper, since only the annular rubber 2 has the function of suppressing torsional vibration generated in the rotating shaft (vibration damping function), the following problems cannot be avoided.

(1) When the rotating shaft is driven at high speed, the swinging of the vibration ring gradually increases, but the annular rubber alone may not be sufficient to suppress this.

(2) As the vibration ring is displaced in the radial direction as the belt tension increases, this phenomenon promotes belt waving, making it impossible to achieve stable transmission of rotational motion.

The present invention aims to provide a torsional damper that overcomes the drawbacks of the prior art described above.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 shows a half-cut sectional view of a torsional damper according to a first embodiment of the present invention. A metal vibration ring 23 is externally fitted onto the outer periphery of the hub 21 via an annular rubber 22 made of an annular elastic body, and
A substantially V-shaped groove 23' that engages with the belt is provided on one outer circumferential surface of the vibration ring 23, and a bearing fitting part 23'' is notched in the other inner circumferential surface, and a ball bearing or the like is provided in the bearing fitting part 23''. The bearing 24 is fitted and fixed. Note that the bearing 2
4, the support ring 25 is inserted into the inner periphery of the bearing 24 and fitted onto the outer periphery of the hub 21, and when the annular rubber 22 is attached, the seat ring 26 is inserted into the hub 21. The annular rubber 22 may be easily attached by being fitted onto the outer periphery of the ring.

The torsional damper with the above configuration has an annular rubber 2
2, a bearing 24 is interposed between the hub 21 and the vibration ring 23, so it has the following features compared to the conventional torsional damper.

(1) Since the bearing works to reduce the displacement of the vibration ring in the axial direction, the swinging of the vibration ring that occurs during high-speed rotation is suppressed.

(2) Similar to (1) above, since the bearing works to reduce the displacement of the vibration ring in the radial direction,
Waving of the belt is suppressed.

(3) Since the effects of (1) and (2) above are achieved, the bearing also plays a vibration damping function in addition to the conventional annular rubber, making it possible to transmit rotational motion more stably.

FIGS. 3 and 4 are half-cut sectional views showing second and third embodiments, respectively, in which the configuration of the first embodiment is partially modified. According to FIG. 3, in the first embodiment of FIG. 2, the bearing fitting part 23'' cut out in the inner circumferential surface of the vibration ring 23 is configured in a stepped shape, and is inserted into the inner circumference of the bearing 24 and fitted onto the outer circumference of the hub 21. The supported ring 25 is inserted through the outer periphery of the bearing 24 and fitted onto the inner periphery of the vibration ring 23, and the seat ring 26, which is fitted over a part of the outer periphery of the hub 21 in the same embodiment, is inserted into the inner periphery of the hub 21. In addition, in FIG. 4, the seat ring 26 is fitted over a part of the outer circumference of the hub 21, unlike the second embodiment shown in FIG. In terms of damping function, methods such as injecting grease, changing the preload on the bearing 24, and installing a sliding bearing instead of a ball bearing are possible.

As detailed above, the torsional damper of the present invention is characterized by having a bearing interposed between the hub and the vibration ring in addition to the annular rubber, thereby reducing whirling during high-speed rotation. It also suppresses belt waving, and further improves vibration damping properties to enable stable transmission of rotational motion, and its practical effects are extremely large.

[Brief explanation of drawings]

FIG. 1 is a half-cut sectional view showing a conventional torsional damper, and FIGS. 2 to 4 are half-cut sectional views showing torsional dampers according to embodiments of the present invention. 21... Hub, 22... Annular rubber, 23... Vibration ring, 23'... Approximately V-shaped groove, 24... Bearing,
25...Support ring, 26...Seat ring.

Claims (1)

[Scope of utility model registration request] In a torsional damper in which a vibration ring is externally fitted on the outside of a hub via an annular rubber, a bearing is interposed in a part between the hub and the vibration ring in addition to the annular rubber. Features a torsional damper.