SU151908A1 - Engine reversing device - Google Patents

Description

Devices for reversing engines, such as marine diesel engines, include a gear wheel on a crankshaft and a camshaft. Adjusting the distribution phases in the valve mechanisms of these devices is done by turning the distribution roller relative to the crankshaft. These devices consist of a gear, a coupler and a split ring.

Reversing mechanisms for internal combustion engines are also known, which act by angularly displacing the cam drive and camshaft washers.

This device differs from the known ones in that in order to increase the stability of the angle of rotation of the camshaft, an infinite chain c is used during the reverse. a tension sprocket spanning the gears on the crankshaft and camshaft, and reversing between the branches of the endless traverse chain with two sprockets.

To obtain the necessary valve timing and angle of shift of the exhaust valve shaft relative to the crankshaft when reversing the engine on both sides of the vertical, relative to the axis of the crankshaft, a pair of guide sprockets is installed. On separate shafts connected to the exhaust valve actuator.

The drawing shows a kinematic diagram of the device described.

The device consists of an asterisk 1, seated on crankshaft 2, a cross beam 3, which can rotate around an axis 4. Two sprockets 5 w are fixed on the cross beam 3. 6, which, when rotated, the yoke extends one of the branches of the drive chain 7, is shortened. Above the crossmember (3 symmetrically with respect to the vertical axis of the engine, two guidewheels 8 v are fixed (9, designed to provide the required camshaft timing when the engine is running for forward and reverse. To compensate for chain wear 7, jerking during operation and changing its tension when reversed is set to the tension sprocket 10. On the camshaft II there is an asterisk / -, a rotating camshaft //, fixed.

In any extreme position, the yoke 3 presses against the fixed stop 13 or 14 under the action of the voltage of the chain 7. A servomotor 15 is installed to move the yoke 3 from one position to another.

In the diagram of the device, the yoke 3 is in a position corresponding to the direction of rotation of the crankshaft 2 clockwise. In this case, the left branch of the chain 7 is heavy and has a longer length than the right branch. Uneven lengths of chains provide the necessary distribution phases. The traverse 3 is pressed by the chain against the stop 13. Simultaneously with the change in the direction of rotation of the crankshaft 2, the servomotor 1/5 rebuilds the traverse 3.

At the same time, the left branch of the chain 7 is lengthened, the right is shortened, thus achieving the required camshaft reversal angle //, and the yoke 3 lies on the stop 14.

Subject invention

Claims (2)

1. A device for reversing engines, for example, marine diesel engines, comprising a gear wheel on a crankshaft and a camshaft, characterized in that, in order to increase the stability of the camshaft angle during reversal, an infinite chain with a tension sprocket is used, covering gears in the crankshaft and distribution rooms, and flip between the branches of an endless chain of traverse with two asterisks. 2. The device according to claim 1, characterized in that, in order to obtain the necessary valve timing and shear angle of the shafts of the exhaust valves relative to the crankshaft when reversing the engine, on both sides of the vertical, relative to the axis of the crankshaft, a plane is installed sprockets on individual shafts connected to the exhaust valve actuator.