RU1796818C - Chain variable-speed drive - Google Patents

Abstract

Usage: in mechanical engineering for smoothly controlling the speed of machines and mechanisms. SUMMARY OF THE INVENTION; the device comprises driving and driven shafts, pulleys mounted on them in the form of pairs of axially movable cones, on the conical surfaces of which a tooth is made, a chain, each link of which includes a package of movable plates for engagement with the teeth of the cones and a control mechanism kinematically connected with cones, as well as spring-loaded shoes for tensioning chain branches. The shoes are equipped with elements aligning the extension of the plates from the chain, which are installed to interact with the plates on each side of the chain. The chain plates are equipped with oil pockets. 2 s.p. f-ly, 4 ill.

Description

The invention relates to mechanical engineering and can be used & drive of machine tools and technological machines.

Known chain speed variators containing driven and driving shafts, driven and driven pulleys mounted on them in the form of pairs of axially movable cones, on the conical surfaces of which a tooth is made, and two kinematically connected chains, each link of which contains a set of plates mounted with relative displacement for engagement with the teeth of the cones; and a speed control mechanism kinematically coupled to the cones. These variators have a limited number of fixed speeds at which the chain plates do not rebuild and the teeth formed by them are retained.

Continuously variable gear ratios are provided by variators with one lamellar chain interacting with cones,

The disadvantage of these variators is their low durability, due to the rapid wear of the housings and damage to the plzstin of the chain. The plates forming the tooth on the chain are rearranged from one module to another and vice versa in one revolution. The tooth of the chain runs across the tooth of the cones. Shocks occur that are detrimental to the durability of the device. The lubricant does not penetrate well between the chain plates, which also negatively affects its durability.

The purpose of the invention is to increase the durability of the variator by reducing the shock, impact load on the plate plate and

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providing better lubrication

This goal is achieved in that, the chain plates that formed the tooth on the cones, the passage sections between the cones, are aligned in the original package with a lower height of the protrusions, for which they are brought into interaction with the alignment elements, which are additionally equipped with a variator. Chain plates are provided with pockets to maintain lubrication.

Fig. 1 shows a variator circuit: Fig. 2 shows the arrangement of tension shoes and leveling elements; Fig. 3 is an embodiment of alignment elements in the form of rollers; via fig. 4 - chain plate with pockets for binding.

The device is as follows. Leading 1 and driven 2 pairs of cones equipped with teeth are mounted on two axes movably in the axial direction (one cone is shown). The device is equipped with a mechanism for sliding and expanding the cones (not shown). The cones are covered by a flexible connection - a chain 3, each link of which contains a package of sliding plates 4. The variator is also equipped with a chain tensioner, made, for example, in the form of shoes 5, pressed to the outside of the chain by springs B. At the ends of the shoes 5, on axis 7, leveling elements 8 are installed with an inlet part bent, for example, along the radius R. The distance between the leveling elements is regulated by washers 9 so that it is equal to the length of the plates L, and the distance from each curving element to the plane of symmetry and the chain is selected equal to L / 2. The necessary orientation of the alignment elements relative to the plates is provided by the claims.

Claims (3)

1, Chain speed variator, containing-. drive and driven shafts, drive and driven shafts mounted on them. pulleys in the form of pairs of axially movable cones with teeth on conical surfaces, a chain, each link of which includes a sleeve and a plate pack placed perpendicular to it with a working gap the circumferential direction of the chain with the possibility of relative displacement to interact with the teeth of the cones, a speed control mechanism kinematically connected with the cones, and spring-loaded shoes interacting with the working surface with the chain for shoulders 10. resting on the shoes 5. To reduce friction losses, i.e. increase efficiency, the variator can be equipped with axles located at the ends shoes on both sides of the chain parallel to the outer surface of the chain, and the alignment elements are made in the form of rollers 11c with a conical outer surface mounted rotatably on the axles. To improve the lubrication of the chain plates, slots 12 are made in them at the ends facing the inner surface of the sleeve 13. The device operates as follows. . The driving cones 1 are driven by an electric motor (not shown). Through chain 3, rotation is transmitted to the driven cones 2. Frequency control rotation of the driven shaft is ensured by the approach and extension of the cones 1 and 2, respectively, by changing the magnitude of the diameters of SI and d 2 of grasping them with a chain. The teeth of one of the cones of each pair 1 and 2 are opposed to the troughs of the other, as a result of which teeth form on the chains that mesh with the teeth of the cones. After the teeth of the chain come out of the hook-l / eni with the teeth of the bonuses, they interact with alignment elements. In this case, the plates are aligned with a minimum overhang from the sleeves 13. Once on the tooth of the other cones, the plates work with minimal impact and form new teeth. The life of the chain and cones is increased. When changing the positions of the plates under conditions of no load, they are more intensely lubricated, which is also promoted by the slots 12, durability CVT increases. tensioning its branches, characterized in that, in order to increase the variator's durability by reducing the impact load, between the plates and teeth of the cones, the variator is equipped with alignment elements mounted on the ends of the shoes perpendicular to the working surface for interaction with the plate packs, the distance between the alignment the elements are equal to the length of the plates, and the distance from each leveling element to the plane of symmetry of the chain is chosen equal to half the length of the plate. 2. The variator according to claim 1, with the exception of the fact that, in order to increase the efficiency by reducing friction losses, the variator is equipped with axles located on the ends of the shoes on both sides of the chain parallel to the outer the surface of the chain, and the alignment elements are made in the form of rollers with a conical outer surface mounted rotatably on the axles. 3. The variator according to claim 1 is distinguished by the fact that, in order to increase the efficiency and durability of the chain by improving the lubrication of the plates, the latter have slots at the ends facing the inner surface of the sleeve.