RU2480367C2 - Chain tensioner - Google Patents

Abstract

FIELD: transport.

SUBSTANCE: invention relates to automotive industry. Chain tensioner comprises tensioner and sprockets with means for their attachment for support. Said tensioner is composed of magnet of whatever type and shape. With sprocket and chain in vertical position, said magnet is arranged between chain strands at required position owing to the use of moving rod and boss. Rod is locked by screw in vertical while said boss is locked in said support in horizontal. With sprocket and chain in horizontal position, said magnet is arranged above chain both strands nearby drive while another magnet is secured above said strands nearby driven sprocket. Magnets are located between sprockets.

EFFECT: higher quality of tensioning.

2 dwg

Description

The invention relates to mechanical engineering, to tension systems for sleeve-roller, roller, gear and other similar chains from single to multi-row, used in various machines and mechanisms, including special equipment (for example, bicycles).

Known chain tensioners containing rollers or sprockets mounted on axles in the presence of rolling bearings, spring mechanisms and supports for mounting. However, they are quite difficult to manufacture, multi-element and not always reliable in operation. In addition, tensioners of this type additionally form friction pairs with a chain, which increases the resistance forces due to friction, and increase the wear of moving mating elements (chains, rollers or sprockets). Known chain tensioners: No. 93036975/11, IPC B62M 9/16, decl. 07/20/93; No. 102374, IPC F16H 7/08, declared 11.17.10 and others that have the above disadvantages.

Closest to the claimed tensioner is Pat. 2053154 Russian Federation, IPC V62M 9/16. Bicycle / Makarov Yu.A. - No. 93036975/11; declared 07/20/93; publ. 01/27/96, Bull. No. 10 (prototype), which contains a wheel frame of a bicycle with a drive installed on it and a chain transmission with a tensioner. However, the above disadvantages are not resolved here.

The objective of the invention is the creation of a contactless chain tensioner both with vertical and horizontal arrangement of sprockets on which the chain is worn, excluding any additional friction pairs in the form of such spring-loaded or tensioning structural elements as rollers, sprockets, etc.

The technical result is achieved by the fact that a magnet is used as a chain tensioner, which does not form a friction pair with a chain, which is fixed on a movable or fixed support, which allows it to be placed in an optimal position both in horizontal and vertical planes.

New in comparison with the prototype in the proposed tensioner are:

of structural elements - a magnet;

performed by a structural element - a magnet can be of any type (permanent or electric) and any shape (round, rectangular, etc.);

in new connections between structural elements, the spatial arrangement of the magnet with respect to the chain can be different: it is installed between the branches of the chain with a vertical arrangement of sprockets on which the chain is worn, and depending on the chain length, in the middle (with a sufficiently short chain length) or in two places (two magnets near the leading and driven sprockets). Or two magnets are installed above the branches of the chain with its horizontal tension on the sprockets of the leading and driven, respectively;

in the novelty of the effect achieved, the tensioner-chain friction pair is completely eliminated, a greater angle of chain sprocket coverage is ensured, and when they are horizontally arranged, strictly coaxial run-in / chain descent of the chain to or from the sprocket is ensured, which generally does not cause increased wear of moving joints.

The proposed technical solution is illustrated in figure 1, 2.

With the vertical arrangement of the sprockets 1 and 2 and chain 3 (Fig. 1), the magnet 4, mounted on a L-shaped or other form of the rod 5, is located in the space between both branches of the chain (upper and lower). The rod 5 is inserted into the boss 6, equipped with a screw 7 for fixing the magnet 4 in the desired height position. In turn, the boss 6 is inserted into the guide supports 8, which allows you to fix the location of the magnet 4 in the horizontal plane.

With a horizontal arrangement of sprockets 1 and 2 and chain 3 (Fig. 2), magnets 4 are installed above both branches of the chain in close proximity to sprockets 1 and 2, thereby raising the chain branches to coincide with the plane of sprocket arrangement, which ensures coaxial arrangement of the chain with drive sprocket and similarly coaxial arrangement of chain with driven sprocket. This significantly reduces the wear of mating moving parts (chains and sprockets). In this case, the shape of the sagging chain in the presence of magnets has the form (a), and in the absence of magnets - (b).

The chain tensioner operates as follows. It (the magnet) is installed in the desired position in relation to the chain (above it, above both branches) and next to the sprocket, which is easily adjustable both vertically due to the mobility of the rod 5 in the vertical plane, and due to the mobility of the boss 6 in the horizontal plane . The strength of the magnet, its size and location are selected taking into account the mass and dimensions of the chain, as well as its speed. When using an electric magnet, its strength, as is known, can increase with increasing chain rotation speed. Constantly pulling the chain with a vertical arrangement of sprockets (shown by arrows in figure 1), the possible stretching of the chain during operation is automatically eliminated and the wear of the elements is compensated, which also leads to a chain elongation. In addition, an increased chain coverage of the teeth of the sprockets is maintained, which reduces stresses in their teeth and at the same time prevents the chain from “jumping off” from them. With the horizontal arrangement of the chain (Fig. 2), magnets (like tensioners) raise the parts of the chain to a position where the chain and sprockets are on the same level, that is, in the same plane, which significantly improves the operation of the chain and sprockets from the point of view of their wear and tear .

Therefore, the operational technical characteristics of the operation of the circuits are significantly expanded when using this type of tensioners.

The proposed tensioner is made by the applicant in kind, has been successfully tested in the laboratory of the Federal State-Funded Educational Institution of Higher Professional Education Petersburg State University of Communication. Therefore, development has industrial value. In particular, the wear of chain transmissions will be reduced by almost 3 times, the reliability of their operation will increase, the stresses in the teeth of the sprockets will decrease due to their more complete coverage, the design will be made easier and cheaper.

Claims (1)

A chain tensioner comprising a chain and sprockets with a device for attaching them to a support, characterized in that it is made in the form of a magnet of any type and shape, which, when the sprockets and chain are vertically arranged, is placed between the chain branches in the required position due to the use of a movable rod fixed by a screw vertical, as well as the boss, fixed in the support horizontally, and when the sprockets and chain are horizontal, one magnet is located above both branches of the chain at the leading sprocket, and the other magnet is fixed above both branches chains of the driven sprocket, while the magnets themselves are spatially placed between the sprockets.

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