SU47867A1 - Crankshaft for two-stroke internal combustion engines with a V or W-arrangement of cylinders - Google Patents

Description

Patent No. 15672 describes a crankshaft for two-stroke internal combustion engines with a V-or W-arrangement of cylinders, equipped with crank discs rotating in ball bearings.

The crank disk of the specified shaft is provided on one side with a portion protruding beyond the ball bearing, and on the other side with a washer, between which part and the washer on the one hand and the ball bearing on the other, the sealing rings are placed.

With ball bearings and smooth sealing rings, it is impossible to achieve the desired tightness between the crank chambers, as when compressing in one of the crank chambers, the mixture will inevitably pass into the other, and this will cause a decrease in pre-compression, poor blowdown of cylinders, power loss and engine failure .

In the proposed modification of the crankshaft in order to eliminate the aforementioned deficiencies, instead of a ball bearing and sealing rings, an end bearing with a labyrinth seal is used in the form of double-sided opposing annular ridges on the discs mounted on the ends of the cheek-neck, which ridges are located

in the annular grooves on both end sides of the dividing wall of the crankcase.

The drawing shows a longitudinal section of a crankshaft for two-stroke internal-torque engines h: V - or W-shaped arrangement of cylinders.

The crankcase of the engine is composed of separate parts 7, 2 and partition 5, connected together by bolts / b.

In the dividing wall 5 of the crankcase a rotary jaw 4 is placed, which at the same time is a crank disk.

On both sides, to the ends of the cheek-neck 4 are fastened with screws 5 disks b with concentric ring ridges b, which fit into the corresponding ring grooves on both end sides of the partition 5 of the crankcase. In this way, an end bearing with a labyrinth seal is obtained, which completely prevents the mixture from running from one crank chamber to another.

In the cheek-neck 4 and counterweights //, at a certain angle, two crank alts 7 are fastened to a friend, on which the connecting rod heads 8 are attached, which are connected to the pistons of 9 TO cylinders.

The gears are mounted on the crankshaft axle 12: 13-wheel drive, 14-for dynamo and / 5-for magneto; instead of a hernia / 5 separate magneto neck it is possible to install a handwheel.

The operation of the described engine is no different from the existing ones, but in it, due to the end bearing and the presence of labyrinth disks 6, which, with their ridges 6, enter the annular grooves of the partition 3 of the crankcase, gas breakthrough is eliminated, and the absence of a fixed impermeable partition reduces the size of the engine, what is of great importance in conditions of limited space.

The subject matter of the invention.

Modification of the crankshaft described in patent No. 15672 for internal horn engines with V or W-shaped cylinders equipped with crank discs, characterized in that instead of a ball bearing, an end bearing with double-sided opposing annular crests 6 was used for the disk main cheek-neck 4. NZ discs 6, mounted on the ends of the cheek-neck 4, which ridges are located in the annular grooves on both end sides of the partition 3 of the crankcase. to the dependent author's certificate of A. G. Revkov No. 47867