SU1257335A1 - Crank mechanism with controlled length crank - Google Patents

Description

The invention relates to mechanical engineering, in particular to crank-connecting rod mechanisms with adjustable crank length, and can be used in any converters of rotary motion into reciprocating with adjustable stroke length of a ram.

The purpose of the invention is to provide automatic adjustment on the fly mechanism, which simplifies its maintenance, increases the efficiency of use and the performance of the devices where this mechanism will be used.

The drawing shows the scheme of the proposed mechanism.

The mechanism includes a housing 1, a crankshaft 2 with cranks in the form of eccentrics 3 placed on the shaft 2 with the possibility of relative rotation, and a device for adjusting the length of the cranks including a drive shaft 4 on which two driving helical gears 5 and 6, having an equal number of teeth and equal, but opposite angles of inclination.

The shaft 4 is placed with the possibility of free rotation in the sleeve 7, which is mounted for axial movement in the guide 8 of the housing 1.

A driven wheel 9, rigidly mounted on the shaft 2, interacts with the driving wheel 6, and a driven wheel 10 placed on the shaft 2 with the possibility of free rotation and with the help of connecting elements, such as Oldgum couplings (not shown), communicates with the driving wheel 5. mutual relative rotation of eccentrics 3. The number of teeth of the wheels 9 and 10 are also equal.

The mechanism contains an adjusting gear drive, the driving wheels 11 and 12 of which are rigidly mounted on the shaft 2, and the driven wheels 13 and 14 are placed with the possibility of free rotation in the housing 1 coaxially to the shaft 4. The driven wheel 14 interacts with its driving wheel 11 the non-editor M. Dylyn Order 4899/32

VNIIPI USSR State Committee

for inventions and discoveries

113035, Moscow, F - 35, Raushsk nab. 4/5

Fi..Pia; 1 PPP "Patent, Uzhgorod, st. Project, 4

0

rarely, and the driven wheel 13 - with its drive wheel 12 through the parasitic gear 15.

The mechanism also contains a screw transmission, the screw 16 of which is rigidly connected to the sleeve 7, and the nut 17 has a double-sided coupling 18, by means of which it interacts with the gear wheels 13 or 14.

The mechanism works as follows. The rotation from the external drive (not shown) is applied either to shaft 2 or shaft 4. When shaft 4 is stationary in the axial direction, eccentricity of eccentrics 3 relative to shaft 2 will be unchanged, because the gear ratio in pairs of wheels 6-9 and 5- 10 in the same way, whereby the shaft 2 and the eccentrics 3 rotate at the same angular velocity.

To change the eccentricity, any type of control body (not shown) connects the coupling half 18 of the nut 17 to either the wheel 14 or the wheel 13, which causes the nut 17 to rotate in either direction. Accordingly, the screw 16, and with it the sleeve 7, the shaft 4 accommodated therein and the wheels 5 and 6 are axially displaced to the right or left. Since the teeth of the wheels 5 and 6 have opposite tilt angles, the wheels 9 and 10, when sliding relative to the wheels 5 and 6, make a reciprocal rotation to the opposite sides. In this case, together with the wheel 9 relative to the eccentrics 3, the shaft 2 rotates, and the eccentric 3 under the influence of the wheel 10 rotates towards it, as a result of which the total eccentricity of the crank shaft 2 and eccentric 3 changes.

Upon reaching the desired eccentricity value, the nut 17 is moved to the middle position and the shaft 4 as a result of self-locking in a screw transmission retains its immobility in the axial direction. The mechanism works with a constant eccentricity until the next adjustment.

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Compiled by V. Savitsky

Tehred I. Veres Corrector A. Zimokosov

Circulation 880 Subscription

Claims (1)

CRANIAL MECHANISM WITH AN ADJUSTABLE LENGTH CRANISE, comprising a housing located in the housing a crank shaft with cranks in the form of eccentrics placed on the shaft to rotate relative to it and each other, and a length adjustment device for the cranks, including a drive shaft housed in the housing for rotation and axial movement, two helical gears fixed to the drive shaft with equal but opposite tilt angles of the teeth and with an equal number of them, two driven gears with an equal number teeth interacting each with a corresponding drive wheel, one of which is rigidly fixed on the crank shaft, and the other is placed on the latter with the possibility of free rotation and connected by connecting elements to eccentrics, and a helical gear, the screw of which is placed in the housing with the possibility of axial movement and kinematically connected with a drive shaft, characterized in that, for the purpose of automatic regulation on the go, the mechanism is equipped with a regulating gear transmission, the two drive wheels of which are rigidly fixed on and the crank shaft, and two followers are placed with the possibility of free rotation on the screw, while one of the drive wheels interacts with the corresponding follower through a spurious gear placed on the housing with the possibility of free rotation and a two-way coupling mounted on the nut, alternately interacting with the corresponding follower adjusting gear wheel. and 1257335 A1