SU1747770A1 - Continuous rotary-to-intermittent motion converter - Google Patents

Abstract

Use: in mechanical engineering, namely in the structures of mechanisms for converting continuous rotational motion into intermittent. The essence of the invention: the device comprises a flexible wheel (1) with external and internal teeth, a rigid wheel

Description

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The invention relates to mechanical engineering, in particular to the design of mechanisms for converting continuous rotational motion into discontinuous.

The known wave gear is a gear for frequency conversion of the rotational or hp, in which one of the gear wheels is made in the form of a thin-walled cylindrical or bell-shaped pipe equipped with a gear rim (flexible shaft). The thin-walled gear ring is a flexible element, the elastic deformations of which are used to transfer the torque from the drive shaft to the driven shaft. The driving link of the wave transmission is the oscillator-cam with rollers, which enters the flexible wheel and deforms it, inserting the teeth into engagement with the teeth of the hard wheel.

When the generator of forced movement rotates, the contact zone of the teeth of the flexible and rigid wheel moves around the geometrical axis of the drive shaft, and since the flexible wheel remains stationary, the rigid wheel and, therefore, the driven shaft or actuator associated with it rotates.

The relative motion of the flexible and rigid wheels is made up of radial and tangential movements.

However, the wave gear transmission is used to convert the rotational frequency and has not previously been used to convert continuous rotational motion into intermittent due to a design that provides for the continuous engagement of the flexible and rigid wheels.

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A planetary transmission is known that includes a gear generator and a flexible shaft with external and internal gear rims, which is used to preserve the rotation frequency VJ.

However, due to the design, this mechanism is not used to convert a continuous rotational motion into an intermittent one; nevertheless, in terms of its design, the planetary gear is the closest analogue to the technical essence of the claimed invention.

The aim of the invention is to expand the kinematic capabilities of the continuous rotation conversion mechanism by producing interruptions.

The goal is achieved by the fact that the flexible wheel is made with internal and external teeth, a planetary wave generator with gear wheels mounted on the axles of the carrier, eccentrically sitting on its axes of rotation and engaging in continuous engagement with the flexible wheel. The diameter of the protrusions of the teeth of the flexible wheel (in the idle state) is less than the diameter of the projections of the teeth of the hard wheel by 2 D. In the initial position, the gears freely engage with the flexible wheel and do not deform the latter when the eccentricities 1 are located in the direction to the axis of rotation of the generator. When the generator rotates, due to a change in the position of the eccentricities, the gears deform the flexible wheel, periodically entering and withdrawing it from engagement with the rigid wheel. At the time of engagement, the relative movement of the teeth of the flexible and rigid wheels occurs, resulting in an intermittent rotation of the hard wheel with the driven shaft in the direction opposite to the useful resistance. Changing the direction of rotation of the driven wheel with the driven shaft in the direction against useful resistance. Changing the direction of rotation of the driven wheel to the opposite when engaging the flexible and rigid wheels is possible using a ratchet mechanism that kinematically connects a flexible and rigid wheel.

The difference of the proposed mechanism from the prototype is that the gear is.

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The wave wheels of the wave generator are located eccentrically relative to their axes and enter into continuous engagement with the flexible wheel, the diameter of the teeth of the flexible wheel is less than the diameter of the projections of the teeth of the hard wheel, which leads to the formation of a gap between the wheels with a free (not deformed) flexible wheel. In the process of rotating the drive shaft with a generator, gears that are in continuous engagement with the flexible wheel periodically deform the latter in radial directions due to changes in the positions of eccentricities and in the deformation zones the tooth — the hard and flexible wheels enter into periodic gears and the hard wheel gets intermittent rotational motion about its axis in the direction opposite to the useful resistance. The ratchet mechanism that kinematically connects a rigid wheel with a stationary shaft allows it to rotate in only one (in a given) direction.

Fig. 1 and Fig. 2 show a diagram of the mechanism for converting a continuous rotational motion into an intermittent. It contains a fixed flexible 1 and a movable rigid 2 gears. The flexible wheel 1 is made with internal gearing with gear wheels 3 installed with eccentricity 1 relative to its axes of rotation in the holder 5 of the generator (drive shaft 6) and external. The linkage with the hard wheel 2 is kinematically connected by means of a ratchet 7 with a fixed flexible wheel 1 When the drive shaft 6 rotates, the gear wheels 3, which are in continuous internal engagement with the flexible wheel 1, roll over its inner surface and periodically deform the wheel in radial diametrically opposite opposite directions due to the change in the position of the eccentricities of the wheels 3 relative to their axes 4 from the proximal (-1) to the axis of rotation of the shaft to the most distant (+1) (Fig. 2). Thus, in one period of movement of the driven rigid wheel (pitch oW), the engagement pole of the wheels 3 and 1 makes one forward and one reverse stroke in the plane passing through the axis of the shaft 6 and the axis 4 and rotating along with the shaft 6 with an angular

speed cx) | . The greatest radial elastic deformation of the flexible wheel leads to an increase in its diameter by 41, a gap of 2 D is chosen in diameter between the circumferences of the projections of the teeth of the hard 2 and flexible 1 wheels, the teeth of these wheels are fully engaged and the flexible wheel 1 becomes elliptical (see figure 3). Rotation of the wheel / relative to axis 4 leads to a change in the position of eccentricity, approaching it to the center of rotation of shaft 6, and when the eccentricity is in the position closest to axis 6, the elastic wheel returns to its original position, acquiring a cylindrical shape (see Fig. 3b). In this case, the teeth of the hard and flexible wheels come out of the engagement and the wheel 2 stops (a break in the rotational movement). Thus, during one full revolution of the generator shaft b, several intermittent rotational movements (rotation steps) of a rigid wheel occur, the number of which depends on the ratio of the initial diameters of the wheels 3 and 2 (n D / d, where n is the number of rotation steps of the hard wheel 2 per revolution shaft 6 of the generator, D and dK - diameters of the initial circles, respectively, wheels 2 and 3). The magnitude of rotation by one step of rotation of a rigid wheel depends on several factors: the length of the cut section on the hard wheel, which participates in the IB engagement during the deformation of the flexible wheel of the angle of the tooth profiles on the kested and flexible wheels; the difference in the number of teeth on these wheels, the size of the gap and between the circumferences of the protrusions of the wheels, the height of the teeth on the rigid and flexible wheels.

An example of a specific design of the mechanism is the mechanism shown in Fig. 1 and Fig. 2, consisting of four gear wheels (a hard wheel 2, a flexible wheel 1, | made with external and internal

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6 and the ratchet mechanism 7. The inner teeth on the flexible wheel 1 with the initial diameter dr of 00 mm and the teeth of the wheels with the initial diameter d% 50 mm are made with a module TP 0.5 mm, and the outer teeth on the flexible wheel 1 (d 212 mm ) and the internal teeth on the hard wheel 2 with an initial circumference of D 226 mm have a modulus of m 2 mm. The gap is D 2.5 mm with a free (without deformation) flexible wheel 1. When the shaft 6 rotates, the gear wheels 3, which are 15 seconds on the inner engagement with the flexible wheel 1 and overlap on it, deform the latter in radial directions by 1 7 mm each. In the direction of the deformations, the diameter of the flexible wheel increases by 41-14 mm. In this case, gaps D are chosen in the directions of the larger axis of the ellipse and the teeth of the flexible 1 and rigid 2 wheels smoothly wedge into each other until they fully engage, and just as smoothly come out of the engagement in the section of the cut part of the rigid wheel 2 with a length equal to about half the circumference of the wheel 3. During this period of time, the rigid wheel rotates about its axis of rotation by a pitch, and after the wheels 1 and 2 leave the gearing, the hard wheel stops due to the resistance of the actuator ana. The reverse rotation of the hard wheel is limited by the ratchet mechanism 7.

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Claims (1)

Claims. A mechanism for converting a non-continuous rotational movement into an intermittent, containing a flexible, wheel with external and internal teeth, a rigid wheel with internal teeth, a planetary wave generator with gear wheels mounted on the axles of the carrier, and a ratchet mechanism, characterized by the fact that, with the two gears 3, the kinematic expansion Installed with an eccentricity of 1, 3.5 mm on their axes of rotation 4), holder 5 of the generator, shaft of rotation of the generator 5, shaft of rotation of the generator 0 6 and the ratchet mechanism 7. The inner teeth on the flexible wheel 1 with the initial diameter dr of 00 mm and the teeth of the wheels with the initial diameter d% 50 mm are made with a module TP 0.5 mm, and the outer teeth on the flexible wheel 1 (d 212 mm ) and the internal teeth on the hard wheel 2 with an initial circumference of D 226 mm have a modulus of m 2 mm. The gap is D 2.5 mm with a free (without deformation) flexible wheel 1. When the shaft 6 rotates, the gear wheels 3, which are 5 seconds on the inner engagement with the flexible wheel 1 and overlap on it, deform the latter in radial directions by 1 7 mm each. In the direction of the deformations, the diameter of the flexible wheel increases by 41-14 mm. In this case, gaps D are chosen in the directions of the larger axis of the ellipse and the teeth of the flexible 1 and rigid 2 wheels smoothly wedge into each other until they fully engage, and just as smoothly come out of the engagement in the section of the cut part of the rigid wheel 2 with a length equal to about half the circumference of the wheel 3. During this period of time, the rigid wheel rotates about its axis of rotation by a pitch, and after the wheels 1 and 2 leave the gearing, the hard wheel stops due to the resistance of the actuator ana. The reverse rotation of the hard wheel is limited by the ratchet mechanism 7. 0 five 0 five 40 Claims. A mechanism for converting a non-continuous rotational movement into an intermittent, containing a flexible wheel with external and internal teeth, a rigid wheel with internal teeth, a planetary wave generator with gear wheels mounted on the axles of the carrier, and a ratchet mechanism by producing intermittent motion, the j-wave gearwheel gears are located eccentrically from the carrier of their axes. & ъ fc " ib РЪ D ov