Vibration damper of movement, with a viscous friction device.

摘要

1,239,450. Vibration dampers. HOLSET ENG. CO. Ltd. 28 June, 1968 [29 June, 1967], No. 30855/68. Heading F2S. A vibration damper consists of a housing containing an inertia weight connected by resilient spokes to a hub portion of the housing, its movement within the housing being damped by a viscous, e.g. liquid, medium filling the spaces between the weight and the adjacent housing surfaces. The spokes interconnect radially spaced parts of the hub and the weight, but are not integral with either. As shown in Fig. 1 the housing defines an annular chamber 17 of which the inner peripheral wall 14 has a portion 27 serving as a hub to which are attached a set of resilient metal or plastics discs 28 each of which has the form shown in Fig. 2. The inner ring of holes 24 in each disc receive screws 25, Fig. 1, for attaching the discs to the hub and the outer ring of holes 29 receive rivets 30 by which the set of discs is attached to the inertia weight 31. The housing contains more than enough damping liquid (e.g. silicone) to fill the spaces between the weight and the facing walls of the housing, the excess liquid being accommodated in a reservoir constituted by the slots 33 in the disc. The disc material between the slots provides a set of involute spokes 32. The complete assembly is designed to be secured to a rotary member such as a shaft 11 to damp torsional vibrations thereof. Fig. 3 (not shown) depicts a spring plate substitutable for the plate 28 of Fig. 2 but having radial instead of involute slots. Figs. 4 to 6 (not shown) depict constructions in which the spokes are separate resilient members fitted in grooves in both a hub and a surrounding annular weight. In Figs. 10 (not shown) and 11, the construction is generally similar to that of Figs. 4 to 6, but the separate resilient members are replaced by a helical coil fitted as shown in slots 214 and 215 in the hub 205 and annular weight 212 respectively. Other modified forms are depicted in Figs. 7 to 9, 12 and 13 (not shown).