Lever-tooth-rack mechanism for executing rotary reciprocation

FIELD: mechanical engineering.

SUBSTANCE: invention relates to lever-tooth mechanisms with rack and it can be used to drive mechanisms of slotting machine, automobile windshield wiper, brush cleaner of screens of grain-cleaning machines, in automatic machines, etc. Proposed mechanism contains base, toothed wheel and crank hinge-mounted on base for rotation, and toothed rack engaging with toothed wheel. Lever with guide member is hinge-mounted on axle of toothed wheel. Guide member engages with rear side of toothed rack forming translational pair. Guide member is made in form of roller hinge-mounted for rotation on axle installed on free end of lever provided with thread. Axle of roller is provided with through cross hole to pass threaded end of lever. Roller is held on lever by nuts arranged from outer and inner sides of roller to adjust and fix radial clearance in meshing between rack and toothed wheels.

EFFECT: improved operating characteristics of mechanism.

2 dwg

 

The invention relates to mechanical engineering, in particular to a gear-lever mechanisms with the rail, and can be used, for example, to drive mechanisms slotting machine, a wiper of the vehicle, the machine etc.

Known rack-and-pinion mechanism to play back-rotational (rocking) motion of a wiper of a motor vehicle comprising a base, a hinge installed on it with the possibility of rotation of the crank, a gear wheel and a roller and pivotally connected with the free ends of the crank rail placed with the possibility of reciprocating motion between the gear wheel and the roller. This toothed surface of the rail has a rectangular shape and cooperates with the toothed wheel, and its back surface for the permanence of the gear rack and pinion has a curvilinear shape and cooperates with a roller. (II Artobolevsky I.I. Mechanisms in modern engineering. - 2nd ed., redesigned. - M.: Science, V. 4, s, figure No. 2418, 1980). However, the use of Reiki with complex curvilinear surface requires in its manufacture special tooling and high precision processing, and more accurate placement of the axes of the rotational pairs on the basis that increases the complexity of manufacturing mechanism and complicates its design. In addition, when the value is positive the wear of the mating surfaces of the roller, Reiki and gears unregulated radial clearance in the engagement of the rack and the toothed wheel may increase so much that it will cause shock loads in engagement and rapid failure of parts of the mechanism.

Known gear-lever mechanism with a rake used in slotting machine containing the base, the hinge installed on it with the possibility of rotation of the toothed wheel and the crank interacting with the toothed wheel rail pivotally connected with the free ends of the crank and pivotally mounted on the axis of the gear lever with a guiding element in the form of a flat Salzach, which interacts with the rear surface of Reiki and forms with it the progressive pair (II Artobolevsky I.I. Mechanisms in modern engineering. - 2nd ed., redesigned. - M.: Science, V. 4, s, figure No. 2275, s, figure No. 2420, 1980).

The set of essential characteristics of this mechanism is closest to the claimed and adopted for the prototype. Its disadvantage is due to the fact that as a progressive pair of rails with a guiding element of the lever used a pair of sliding friction, durability and reliability which without scuffing depend on the size of the radial gap in a rack and pinion engagement. Radial the clearance rack in engagement is not regulated, therefore, with considerable wear C the tooth tops of the rack and the toothed wheel and the mating surfaces of the guiding element and Reiki you can restore only replacing worn parts by new ones. In order to maintain the serviceability of the product is necessary to ensure accurate fit of the mating parts and quality treatment of friction surfaces of the rack and the guide element, and apply grease and expensive wear-resistant materials, which, in turn, leads to increased complexity and the complexity of the fabrication, repair and maintenance of the mechanism.

The task of the invention is to improve the performance of the mechanism.

The problem is solved by the fact that in lever-gear-rack mechanism for playback swinging movement, containing a base, a hinge mounted on it for rotation of the toothed wheel and the crank interacting with the toothed wheel rail pivotally connected with the free ends of the crank and pivotally mounted on the axis of the gear lever with a guiding element, which interacts with the rear surface of the rail and forming with it a progressive couple, the guide element is designed as roller, hinge installed rotatably on an axis that is installed on the loose end of the lever having a thread, with the axis roller is made with a through transverse bore for passage of the threaded end of rich the ha and held thereon by nuts, installed with outer and inner sides of the axis of the roller, for regulating and fixing the radial gap in engagement Reiki with the toothed wheel.

1 shows a lever-rack-and-pinion mechanism for playback swinging movement; figure 2 is a partial section view along the axis of the lever.

The mechanism comprises a base 1, a hinge mounted on it for rotation of the toothed wheel 2 and the yoke 3. Free ends of the crank 3 pivotally connected to the rail 4, which interacts with a toothed wheel 2. On the axis 5 of the toothed wheels 2 swivel is mounted for rotation lever 6 with a guiding element in the form of a roller 7. The roller 7 of the hinge is mounted for rotation on the axis 8 and communicates with the rear surface of the slats 4.

For adjustment of the radial clearance in the engagement of the rail 4 with the toothed wheel 2 axle 8 of the roller 7 is installed on the loose end of the lever 6 can be moved along it. For this loose end of the lever 6 is threaded, and the axis 8 of the roller 7 through a transverse hole 9, into which is inserted the threaded end of the lever 6. While fixing the axis 8 of the roller 7 on the threaded end of the lever 6 with the outer side of the axis 8 is an adjusting nut 10, and the inner - nut 11.

The mechanism works as follows.

The crank 3 is given in BP is the incarnation of a gear motor (not shown). Rotation of the crank 3 leads rail 4 simultaneously reciprocating and oscillating movement. The rail 4, acting on the toothed wheel 2 and the roller 7 and causes them to commit their swinging movement around their axes 5 and 8. The lever 6 does swinging movement around the axis 5 gears 2. Depending on the size of the crank radius, the diameter of the gear and the distance between the axes of the gear motor and the gear wheel angle of rotation of the toothed wheel in one direction can take on different meanings within one turn of the gear, i.e. in the range of 360°and within a few turns to some finite value.

The constant engagement of the rail 4 with the toothed wheel 2 is provided with a roller 7. In the event wear their mating surfaces of the necessary radial clearance in engagement set the adjusting nut 10. When tightening the nuts 10, the axis 8 of the roller 7 is moved along the threaded end of the lever 6 by the amount of wear and locked into position by a lock nut 11.

Lever-rack-and-pinion mechanism for playback swinging movement, containing a base, a hinge mounted on it for rotation of the toothed wheel and the crank interacting with the toothed wheel rail, hinged sviazannuju free ends of the crank, and pivotally mounted on the axis of the gear lever with a guiding element, which interacts with the rear surface of the rail and forming with it a progressive couple, characterized in that the guide element is designed as roller, hinge installed rotatably on an axis that is installed on the loose end of the lever having a thread, with the axis of the roller is made with a through transverse bore for passage of the threaded end of the lever and is held thereon by nuts that are installed with the outer and inner sides of the axis of the roller, for regulating and fixing the radial gap in engagement Reiki with the toothed wheel.



 

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