| 摘要 |
A tensioning and damping element for endless chain drives, especially for roller chain drives, can be used for endless chain drives, which are to be tensioned diametrically. The material is an elastic plastic. All told, the known tensioning and damping elements, in conjunction with the wear of the chain, the load changing phases, as well as the reversing according to the degree of deformation, have the disadvantage of a phased running irregularity, an increased running noise and of wear-intensive areas in the toothed rim. An element with a ring part and a toothed rim of arc-shaped teeth with, in each case, axially opposite bulges in the roller-seating and, between these, roller-seating depressions, grooves, which are disposed peripherally between the ring part and the bulges, an extended pitch and extended roller-seatings with the advantageous profile shape similar to a semielliptical curve lying on the root circle. |
| 主权项 |
1. Tensioning and damping element for endless chain drives, especially for roller chain drives, which, as an elastically deformable element, has a ring part 4 and at the outer periphery thereof, a corresponding toothed rim, capable of gripping the chain, with elastically deformable, laterally open teeth 1 and, in the root circle, roller-seatings 3, which pass into the ring part, is disposed between a tight side and a slack side of the chain and thereby acts constantly on both sides of the chain, and is deformable between the shape of a concentric element and the shape of a Cassinian curve with an shape close to an ellipse, the diameter of the pitch circle or the smallest axis of the elastic element being larger than the diameter of the pitch circle of the smallest chain sprocket of the chain drive,
wherein the toothed rim between the teeth 1 has radially elastic roller-seatings 3 with bulges 5a, 5b, which are axially on opposite sides in the width of the roller-seatings, arranged on either side of the ring part 4 and lying externally on the root circle Df with a roller-seating depression 6 of depth e0=0.5(Df−Dv), which extends centrally between the bulges 5a, 5b in the ring part between the root circle Df and the depression circle Dv, the amount e0 of which, in the stress-free starting position, is larger than the amount of a height h1 in a camber 8 in the elliptical, pretensioned state, wherein the toothed rim has grooves 7a, 7b between the ring part 4 and the bulges 5a, 5b, that the toothed rim has an extended pitch q0 with 1.02×p0<q0<1.08×p0, p0 being the pitch of the roller chain, which is not worn out, as well as extended roller-seatings with a profile shape similar to a semi-elliptical curve, which lies radially on the root circle and the main apex axis W1, W2 of which, projected on the root circle, has a length l0, which is given by 1.1×d1<l0<1.45×d1, wherein d1 is the diameter of the roller of the chain. |
