RU2464466C2 - Conversion device of back-and-forth movement to rotational movement and vice versa - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: device consists of housing, shell with arc-shaped cam groove and shaft. Housing is closed with fixed flanges. Shaft is protected against rotational movement; at that, it can be moved progressively. The axis which is located in arc-shaped cam groove of the shell is installed on the shaft.

EFFECT: enhanced operating reliability of device.

2 cl, 3 dwg

Description

The invention relates to mechanical engineering, and in particular to mechanisms for converting reciprocating motion into rotational motion and vice versa.

A known mechanism for converting reciprocating motion into rotational motion and vice versa, comprising a housing, a cylindrical slider located in the housing and having a closed cam groove on a cylindrical surface, a shaft mounted in the housing with the possibility of rotation and kinematically connected with the slider, and located in the housing emphasis for interaction with the cam groove of the slider, made in the form of a ball mounted on the saddle body with a spherical working surface and placed in the saddle, and lachkovaya groove is provided with an arcuate profile corresponding bead generator. The mechanism is equipped with additional stops mounted on the housing symmetrically relative to the axis of the slide [A. S. 1753112 from 11.13.1989. The mechanism for converting rotational motion into reciprocating and vice versa. Bulletin No. 29 of 08/07/92].

A disadvantage of the known mechanism is its unreliability arising in connection with a very high requirement for precision manufacturing of the main parts. The unresolved key points in the design of the mechanism makes it difficult to obtain a closed (one-sided, full-speed, continuous) rotational motion. In fairness, I note that most of these mechanisms have similar flaws.

Improving the reliability of the mechanism and obtaining the full conversion of translational motion into rotational motion and vice versa is the main inventive idea and goal.

In the proposed device, as in the described prototype, there is also a housing, a cam arcuate groove, a shaft. But unlike the solutions proposed in the mechanism discussed above, the housing is closed by fixed flanges, the shaft is limited from rotational movement by the flanges, but the shaft is moved translationally, an axis is installed on the shaft, which enters the cam arc-shaped groove of the cage, the groove is made of two halves connected still. This embodiment of the device is not obvious, but it is enough that the device converts translational motion into rotational motion and vice versa. To obtain a full rotation rotation of the halves of which the groove is made, it is necessary to position them with a slight offset relative to each other so that the recess located in the cam groove is offset from the axis of the protrusion of the other half in the final section of the translational motion.

For a clearer explanation of the design and operation of the device, Fig. 1 shows the very proposed device for converting reciprocating motion into rotational motion and vice versa; Fig. 2 - section along aa; Fig. 3 - profile scan of the coupling halves with a mutual arrangement.

The device consists of a housing 1 with fixed flanges 2, a shaft 3, limited from rotational movement by flanges with spline connection. An axis 4 is mounted on the shaft, which enters the cam arched groove made of two halves 5, which are fixedly connected, forming together a yoke 6 with a groove and gear.

The device operates as follows.

When the reciprocating movement of the shaft 3, the axis presses on the arcuate groove of the coupling halves 5, forcing the yoke 6. The load is removed from the gear of the yoke. On the unfolding of the profiles of both halves of the clip groove, the thick line shows the surface where the translational force transmitted from the shaft through the axis is applied. At the end of the shaft stroke, the direction of the applied force changes with a change in the direction of translational motion. This is facilitated by a slight shift in the relative position of the halves of the clip groove.

When the cage rotates, the shaft moves forward, that is, the device has reversible movements.

I also note one feature. If the initial position of the axis is not at the end point of the sequential movement, when the initial force is applied in the opposite direction, the cage starts to rotate in the opposite direction. After turning through an angle less than 90 ° and approaching the final section, the rotation begins in the right direction. In some cases this can be very helpful. If necessary, this feature is eliminated by standard, known methods and is not discussed in detail here.

By changing the groove profile, you can get movements with different dependencies of the motion transformation.

The possibilities of industrial application of this device stem from its purpose. For example, this device is a complete replacement of the crank mechanism in internal combustion engines. Compressors can use its reversibility - the ability to convert rotational motion to reciprocating motion.

Claims (2)

1. A device for converting reciprocating motion into rotational motion and vice versa, consisting of a housing, a cage with a cam arcuate groove, a shaft, characterized in that the housing is closed by fixed flanges, the shaft is limited from the rotational movement by the flanges, but is made translationally movable on the shaft an axis is installed, which is located in the cam arcuate groove of the cage. 2. The device according to claim 1, characterized in that the recess in the cam groove of one half of the cam arched groove of the cage is offset from the axis of the protrusion of the other.

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