SU1193344A1 - Crank mechanism with adjustable crank length - Google Patents

Abstract

1. CURVED MECHANISM WITH ADJUSTABLE LENGTH CURVED, containing base, drive shaft, crank rigidly mounted on the shaft with a radial groove, another groove cam mounted on the shaft, and a connecting link with two rollers, one of which interacts with the cam groove, the other, the other, and the cam groove, another. crank, and a connecting rod connected to the connecting link pivotally, characterized in that, in order to allow adjustment on the move, the cam is placed on the shaft rotatably, and the mechanism is provided with a turning device and fixation Cam operations, including a cam-movable spline joint connected to the cam and a sleeve mounted on the shaft rotatably, a gear drive, whose drive wheel is rotatably mounted on the shaft, and a coupling I interacting with the tulk, the coupling half of which is rigidly connected to the base and a friend with an output gear wheel. 2. The mechanism according to claim 1, about tl and h, and with the fact that, for the purpose of smoothness of adjustment, two-height gear was used as a gear. with co with co 4 :: 4

Description

The invention relates to mechanical engineering, namely crank. crank length adjustable mechanisms, and can be used in motion converters with an adjustable slider stroke. The purpose of the invention is to enable adjustment on the fly, which increases productivity, reliability of the mechanism and reduces energy consumption and smooth adjustment. On figure 1 shows the mechanism, a longitudinal section; figure 2 - view And n figure 1. The mechanism contains a base I, a drive shaft 2, a crank 3 rigidly fixed on it with a radial groove 4, a cam 5 with a shaped groove 6 and a connecting link 7 with rollers 8 and 9. A connecting rod 11 is connected through a hinge 10 with a link 7 with the possibility of free rotation is placed in the lane 12 of the coupling coupling, the coupling half 13 which is rigidly connected to the base 1, and the other gyulumufta 14 rigidly connected to the output gear 15 by the pinion gear; its wheel 16 which is connected or to the drive shaft 2, or with a separate drive (not shown). To expand the kinematic in zmozhnostey and smooth adjustment of the gear transmission may be a two-speed, for which the mechanism is provided with a gear box 17. The cam 5 is coupled with the sleeve 12 pszdvizhnym pshitsevym compound through slots F8. The gear ratio, the number of gears is chosen so that its output wheel 15 has the same angular velocity with the drive shaft 2. The mechanism works as follows. . . . When the shaft 2 rotates simultaneously with it and with the same angular speed, the gear wheel 15 442 rotates rigidly connected with the coupling half 14. In the stationary mode, the sleeve 12 is pressed against the coupling half, rotates with it and passes the splines 18 through the splines 18. wheel 15 and shaft 2 have the same angular velocity, then shaft 2, crank 3, wheel 15, coupling half 14j sleeve 12 and cam 5 rotate as a single link. Through connecting link 7, connecting rod | 1 and hinge 10, rotational movement of the crank 3 is converted into reciprocating movement of the working link. To adjust the length of the crank 3, the connecting sleeve 12 is switched from the coupling half: 14 to the coupling half 13, which is rigidly connected to the base 1. The sleeve 12 and the cam 5 together with it stop, and the shaft 2 and the crank 3 continue rotation. Roller 9, moving. Cushioning the figure 5 slot 5 of the cam 5 moves the link 7 along with the roller 8 along the radial slot 4 of the crank 3. When the link 7 reaches the desired position, the sleeve 12 switches to the coupling half 14 and the mechanism continues to work in the new stationary mode. The operation of the mechanism with the gearbox is similar to that described with the difference that the sleeve 12 does not turn off. from the coupling half 14, a little shrinking or vice versa, increase the angular velocity of the wheel 15 by turning on the second gear in the gearbox 17. As a result, the cam 5 turns relative to the crank 3 much slower than in the previous case. Accordingly, the crank length adjustment is smoother and more accurate. At the end of the adjustment on the gearbox again include the first re-. the cottage, and the cam 5 comes in synchronous rotation with crank 3.

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Claims (2)

1. CRANKSHAFT MECHANISM WITH ADJUSTABLE CRANKSHAFT LENGTH, containing a base, a drive shaft, a crank with a radial groove fixed to the shaft, a groove cam placed on the shaft, a connecting link with two rollers, one of which interacts with the cam groove, and the other with a crank groove, and a connecting rod pivotally connected to the connecting link, characterized in that, in order to enable regulation on the go, the cam is rotatably mounted on the shaft, and the mechanism is equipped with a turning and locking device to latch ·, including a movable spline connection connected to the cam and rotatable, a gear, the output wheel of which is rotatably mounted on the shaft, and a coupling coupling interacting with the bush, the coupling halves of which are rigidly connected <g to the base, and another — with a gear output wheel. 2. The mechanism according to π.1, with the fact that, for the purpose of smooth adjustment, two-speed gear is used as a gear transmission. '' SU „o 1193344