RU2151935C1 - Stepless transmission - Google Patents

Abstract

FIELD: mechanical engineering. SUBSTANCE: stepless transmission has driving and driven shafts, cylinder, U-shaped plates of equal length engaging through their slots, rollers. Member whose section is similar to inner section of cylinder, and teeth hinge-coupled to form endless belt sliding along member surface. Driving shaft placed inside cylinder is coaxial with the latter. U-shaped plates engage with inner surface of cylinder through their end faces. Outer teeth engage with projecting ends of plates on which rollers are mounted. Inner teeth engage with driven shaft. EFFECT: simplified design of stepless transmission, increased reliability. 3 dwg

Description

 The invention relates to mechanical engineering and can be used in devices for continuously changing the speed of rotation of the shaft and torque.

 A known gear transmission (RU N 2023208, F 16 H 1/24, 1/04, 12/27/90).

 The transmission contains driving and driven wheels, gears in the form of balls located on the periphery of the driving wheel in spherical cavities, the wheels are placed in cylindrical grooves of the rack and between them on the rack are wedge-shaped guides with a concave working surface, smoothly interfaced with the working surface of the grooves.

 Known transmission with adjustable speed of rotation of the driven shaft (SU N 1812370, F 16 H 1/16, 11.07.90).

 The transmission contains driving and driven shafts, which are located coaxially, the kinematic connection of the main and adjustable motors is made in the form of two worm gears installed in the rotor of the adjustable motor, the axles of the wheels of which are parallel to the axis of the drive shaft, the axes of the worms are kinematically connected with the shaft of the adjustable motor. When the adjustable motor is turned on, the rotation of the shaft is transmitted through the wheels, the worm pair to the drive shaft, which is connected to the main engine.

 Known mechanical continuously variable transmission (RU N 2018746, F 16 H 15/00, 29/22, 02.07.90).

 The transmission contains input and output shafts, a conversion mechanism, an eccentricity change mechanism, and a reverse control mechanism. The transforming mechanism is made in the form of a generator of flexible waves, flexible and rigid wheels interacting with flexible wheels by means of spring-loaded elastic working bodies.

 The disadvantages of the above structures is the low reliability and complexity of the design.

 The problem to which the invention is directed, is to increase reliability, simplify the design of continuously variable transmission.

 The problem is solved as follows.

 The proposed continuously variable transmission comprises drive and driven shafts and is characterized in that the drive shaft is mounted coaxially in the cylinder, which can be rotated about an axis. The drive shaft is equipped with plates of equal length having a U-shape, with the plates located in its radial grooves with the possibility of reciprocating movement, the U-shaped groove of one plate enters the same groove of the other plate, the plates contact with their ends to the inner surface of the cylinder. The protruding ends of the plates are provided with rollers and are in contact with external teeth pivotally connected to each other in an endless strip sliding over the surface of a contour that has a cross section similar to the internal section of the cylinder. The inner teeth of the endless belt are in contact with the driven shaft.

 The present invention meets the criterion of "novelty," since stepless transmission that would be described by the above set of essential features is not known from publicly available information sources.

 The present invention meets the criterion of "inventive" level, since the non-obvious structural design of the transmission - the drive shaft with the plates and the driven shaft with a gear surface - allows you to solve the technical problem.

 The invention is illustrated by drawings, where in FIG. 1 - drive shaft with plates, in FIG. 2 is a transmission diagram, in FIG. 3 - plate design.

 The transmission consists of a drive shaft 1 mounted coaxially in the cylinder 2, the inner surface of which in a section perpendicular to the axis of rotation, has the shape of an irregular ellipse. Shaft 1 rotates from an engine (not shown). Radial grooves are made in it, in which plates of equal length are installed, having a U-shape (Fig. 3), and the U-shaped groove of one plate enters the same groove of the other plate. When the shaft 1 rotates, the plates 3 move along the groove in the radial direction relative to each other. The cylinder 2 is mounted rotatably about an axis, and the plates passing through the axis of rotation of the shaft and cylinder are equal to each other (AB = A'B '= A "B"). The protruding ends of the plates 3, on which the rollers are located, are in contact with the outer teeth 4, which are pivotally connected to each other and represent an endless strip sliding on the surface of the contour 5 having the same cross-sectional shape as the cylinder 2 (from zone "H" to zone "B"). The inner teeth of the tape are in contact with the shaft 6 and cause it to rotate.

 The transfer works as follows. Shaft 1 is driven by the engine. The plate 3 moves reciprocating in the radical grooves of the shaft. The rollers located on the protruding ends of the plates 3 are engaged with the outer teeth 4 of the tape, which slides along the surface of the contour 5. The inner teeth of the tape are engaged with the teeth of the shaft 6 and transmit rotational motion to it. Since the cross section of the contour 5 is identical to the cross section of the inner surface of the cylinder 2, the working distance between the grooves of two adjacent teeth coincides with the distance between adjacent rollers of the plates and varies from a minimum in zone "H" to a maximum in zone "B".

 When the shaft 1 rotates with a constant angular velocity, the rollers of the plate 3 will have different linear speed of movement from the minimum in zone "H" to the maximum in zone "B". Thus, being engaged in zone "B", the rollers will transmit movement to the outer teeth with maximum speed, and in zone "H" - with a minimum. The internal teeth of the tape, in turn, transmit the movement to the shaft 6. Thus, at a constant angular speed of rotation of the shaft 1, depending on the position (turn) of the cylinder 2 from zone “B” to zone “H”, shaft 6 will have different angular speeds of rotation.

 The shaft 1 can be made of disks, on the end sides of which there are grooves for the plates. At each end, the grooves are located at an angle of 90 degrees, and on the opposite side they are offset by 45 degrees. By interconnecting several such disks and shifting them to the required angle, it is possible to obtain the necessary number of plates with rollers corresponding to the number of teeth, ensuring constant contact of at least two pairs of "tooth-roller".

 The present invention will find application in mechanical engineering, in devices where it is required to solve the problem of stepless change of shaft rotation speed.

Claims (1)

 A continuously variable transmission comprising drive and driven shafts, characterized in that it further comprises a cylinder, the axis of rotation of which coincides with the axis of rotation of the drive shaft located inside the cylinder, located in the radial grooves of the drive shaft with the possibility of reciprocating movement of U-shaped plates of equal length, which with their grooves enter one another, and with their ends contact with the inner surface of the cylinder, rollers with which the protruding ends of the plates are equipped, and teeth pivotally connected between each other in an endless tape sliding over the surface of a contour that has a cross section similar to the inner section of the cylinder, with the outer teeth of the endless tape in contact with the rollers, and its inner teeth with the driven shaft.

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