RU2771388C1 - Chain variator - Google Patents

Abstract

FIELD: mechanical engineering.SUBSTANCE: invention relates to the field of mechanical engineering. Chain variator contains driving and driven pulleys installed on parallel shafts of spline connection, including pairs of cone-shaped half-pulleys movable along the shafts with slots forming trapezoidal sectors and jumpers in the form of ribs of rectangular section with a wedge-shaped head, articulated by hubs, and with through longitudinal-radial slots, made with the possibility of entry-exit of half-pulleys into each other, and an element of flexible resilient connection. For engagement, a chain with profiled protrusions and a spring enclosing the chain, the coils of which are located on the chain links between the profiled protrusions of the chain and between the bridges in the slots of the half-pulleys, are introduced as an element of a flexible resilient connection. The bridges between the slots are made in the form of ribs of rectangular section with a wedge-shaped head formed by profile chamfers, and the slots forming a trapezoidal sector are made with the possibility of ensuring the convenience of the spring coils engaging with the half-pulley bridges, in addition, the number of chain links is determined by profiled protrusions, depending on number of half-pulley jumpers.EFFECT: increased efficiency of the variator.1 cl, 5 dwg

Description

The invention relates to the field of mechanical engineering, mainly to drives, in particular to gearing with a flexible connection, namely, continuously variable transmissions, and can be used in the construction of various vehicles.

It is known that a variator is a device that transmits torque and is capable of steplessly changing the gear ratio in a certain control range.

There are various designs of variators:

It is known that one of these is the "Conical roller variator", patent RU No. 145291, F16H 15/18, publ. They are equipped with cone-shaped discs, directed by the base in different directions and located so that there is a certain distance between the generatrices of the discs. Between the discs there are intermediate, torque-transmitting rollers pressed against the discs from both sides by means of springs. The rollers, together with the spring device, are capable of translational movement along the tapered surfaces of the disks.

The disadvantage of this technical solution is the complexity of the proposed design of the variator and insufficient adhesion between the rollers and disks due to a certain distance formed as a result of wear, which reduces the adhesion between the disks and transmits torque and gear ratio, making the variator inefficient.

The closest in technical essence and taken as a prototype is the "V-belt variator", patent RU No. 107310, F16H 9/16, F16H 55/56, publ. pulleys, each of which, in turn, consists of two half-pulleys movable in a horizontal plane with through longitudinal-radial slots to allow the half-pulleys to enter each other, and a drive belt. Half-pulleys are made in the form of one part, consisting of three bodies of revolution having a common axis and interconnected. The drive belt is made of an elastic material with the possibility of partial transverse deformation of its side surfaces in contact with the surfaces of the pulleys, and obtaining the effect of a "toothed belt".

The disadvantage of this technical solution is the low grip of the pulleys due to the possibility of slipping, namely, during operation, when increasing the speed, the belt, in contact with solid surfaces formed by the half-pulleys, has the ability to slip over them during jerks or excessive loads, reducing the wear resistance of the belt and the efficiency of the variator as a whole .

The problem to be solved by the invention is the introduction of an elastically compliant connection between the elements that ensure the transmission of torque by engagement.

The technical result of the invention is to increase the efficiency of the variator due to the clutch of the pulleys by engaging with the introduction of a flexible elastically compliant connection between the elements that ensure the transmission of torque.

The technical result is achieved by the fact that in a chain variator containing splined connections installed on parallel shafts, driving and driven pulleys, including pairs of cone-shaped half-pulleys movable along the shafts with slots forming trapezoidal sectors and jumpers in the form of rectangular ribs with a wedge-shaped head, articulated by hubs with through longitudinal-radial slots with the possibility for the half-pulleys to enter each other, and an element of flexible elastically compliant connection, according to which, as an element of flexible elastically compliant connection, a chain with profiled protrusions and a spring enclosing the chain are introduced, the coils of which are located on the chain links between the profiled protrusions chain and between jumpers in the slots of the half-pulleys, while the jumpers between the slots are made in the form of rectangular ribs with a wedge-shaped head formed by profile chamfers, and slots forming a trapezoidal sector, made with the ability to provide to ensure the convenience of the spring coils engaging with the half-pulley webs, in addition, the number of chain links is determined by profiled protrusions, depending on the number of half-pulley webs.

To clarify the technical essence, consider the drawings (the shafts are not specifically shown in the figures):

Fig.1 - shows a General view of the chain variator;

Fig.2 - shows a General view of the chain variator in an arbitrary perspective;

Fig.3 - shows a section along the chain on a general view of the chain variator in an arbitrary axonometry;

Fig.4 - shows the position of the half-pulleys on the driving and driven pulleys and the chain with a spring;

Fig.5 - shows a section of a chain with a spring;

where:

1, 2 - leading and driven half-pulleys;

3 - jumpers of half-pulleys;

4 - chain with profiled protrusions;

5 - spring.

The proposed technical solution makes it possible to obtain an effective "Chain variator" due to the introduction of an elastically compliant connection between the elements that ensure the transmission of torque by engaging the coils of the spring with both the chain protrusions and the pulley webs.

Variator with flexible resilient connection consists of two parallel shafts with slots for moving two half-pulleys 1 of the driving pulley and two half-pulleys 2 of the driven pulley.

Half pulleys 1, 2 have a conical shape.

Half-pulleys 1, 2 have slots, trapezoidal sectors separated by bridges 3.

Jumpers 3 are made in the form of ribs of rectangular section with a wedge-shaped head formed by profile chamfers entering the interturn space of the spring 5 dressed on the chain 4.

Sectors are formed between jumpers 3, allowing the mutual penetration of half-pulleys 1, 2 to change the gear ratio of the variator.

The elastically pliable chain 4 has links with profile ledges entering the interturn space of the spring 5 dressed on the chain 4.

Chain variator works as follows.

With a fixed position of the half-pulleys 1, 2 on the splined shafts, the torque from the driving half-pulleys 1, through the engagement of the coils of the spring 5 and the jumpers of the half-pulleys 3 - on the one hand and the coils of the spring 5 and the profile projections of the chain links 4 on the other hand, is transmitted to the chain 4, and then in reverse order from chain 4 to driven half-pulleys 2.

Changes in the gear ratio of the variator is carried out by moving in opposite directions, leading 1 and driven 2 half-pulleys.

Due to the elastic compliance of the turns of the spring 5, there is a continuous engagement of the protrusions of the chain 4 and the jumpers of the leading 1 and driven 2 half-sheaves, including in the transient modes of controlling the gear ratio of the variator.

Claims (1)

Chain variator containing mounted on parallel shafts splined connection driving and driven pulleys, including pairs of cone-shaped half-pulleys movable along the shafts with slots forming trapezoidal sectors, and jumpers in the form of ribs of rectangular section with a wedge-shaped head, articulated hubs, and with through longitudinal-radial slots, made with the possibility of entry-exit of half-pulleys into each other, and an element of flexible resilient connection, characterized in that for engagement as an element of flexible resilient connection, a chain with profiled protrusions and a spring covering the chain are introduced, the coils of which are located on the chain links between the profiled protrusions chains and between jumpers in the slots of the half-pulleys, while the jumpers between the slots are made in the form of rectangular ribs with a wedge-shaped head formed by profile chamfers, and the slots forming trapezoidal sectors are made with the possibility of providing convenience entry of spring coils into engagement with half-pulley webs, in addition, the number of chain links is determined by profiled protrusions, depending on the number of half-pulley webs.

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