DE4223490A1 - Two=stroke reciprocating piston engine - has neighbouring pistons with toothed racks, which are connected by shaft with gear, to form working unit - Google Patents

Abstract

The engine is without crank mechanism, and has cylinders located in a row. Two pistons (3a,b) with connecting rods (4) are connected via the shaft (6) with carrier elements (7). The piston rods engage into a driven gear via a mechanical or magnet-hydraulic, electronically-controlled freewheel unit (8) with toothed gear. Due to this, the linear movement of the pistons with the connecting rods is transferred into a rotary movement. USE/ADVANTAGE - 2-stroke reciprocating piston engine has higher energy output at lower number of strokes, mechanical stroke limitation is by initiation of combustion, torque radius during working stroke remains constant.

Description

The invention relates to a two-stroke reciprocating engine without crank drive, the can be used both as a stationary engine and in motor vehicles. Reciprocating engines with crank drive and are well known Rotary lobe machines under the name Wankel engines.

Reciprocating engines with crank drive have a crankshaft with a connecting rod and Flywheel. Increases in performance usually occur by increasing the speed, by making the piston diameter larger than the piston stroke. This Design requires a relatively high engine mass. In the top dead center position, too At the beginning of the working cycle, the piston with the connecting rod stands vertically on the Connecting rod journals so that the bearings are only subjected to radial loads without Torque on the crankshaft. After reaching a corresponding one Crank angle when the combustion pressure is reduced by the piston stroke, there is a torque on the crankshaft. The inclination of the connecting rod to Cylinder axis causes radial pressure on the piston, which leads to one-sided Wear of the cylinder bore and the piston leads.

Rotary lobe machines have a good mass-performance ratio not enforced due to sealing problems.

The aim of the invention is to provide a two-stroke reciprocating engine, which Disadvantages of the crank mechanism does not have a cheaper mass-performance Ratio and a higher energy yield with a lower number of strokes.

The object of the invention is a two-stroke reciprocating engine, in which the general usual mechanical stroke limitation through the introduction of the Combustion process takes place and in which the torque radius during the Work cycle remains constant.

According to the invention the object is achieved in that two side by side lying pistons with racks to each other through a shaft with gear a work unit are connected, the reciprocating stroke of the one piston causes the compression stroke of the other piston and at the same time, the work performed on both sides of the shaft arranged freewheels is transmitted. By the attached to the freewheels Gear will engage the work performed during the work stroke Output gear transmitted while the freewheel on during the compression stroke Disengaging from the engaging shaft causes. When pairing two or a plurality of working units a multi-cylinder arrangement is achieved, the Shafts are connected with a gear.

The invention will be explained in more detail below using an exemplary embodiment become. It shows:

Fig. 1 is a view of the working unit of a two-stroke reciprocating engine without crankshaft drive with cylinders arranged in series,

Fig. 2 is a side view of the working unit of a two-stroke reciprocating piston engine without a crank mechanism with cylinders arranged in series.

Fig. 1 shows the housing with the cylinders 2 arranged side by side, in which the linear movement of the pistons 3 a and 3 b, connected by the push rods 4 (racks) with the driving elements 5 (teeth) by means of the shaft 6 with the firmly connected Driving element 7 (gear) and the freewheels 8 fastened on the shaft 6 with the gear 9 are converted into a rotational movement.

Fig. 2 shows the engagement of the two gears 9 to the driven gears 10 to the output shaft 12. The guides 11 serve to receive the push rods 4 .

When the combustion process begins, the working stroke of the piston 3 a and the compression stroke of the piston 3 b take place. After the speed of the gear 9 is reached by the shaft 6 with the driving elements 7 , the freewheel 8 is blocked and the work is transmitted. As the piston speed decreases before the end of compression, the speed of the shaft 6 with the entrainment elements 7 decreases and the freewheel 8 releases the connection to the gear 9 . The remaining kinetic energy of the work unit causes the residual compression. Due to the freewheel 8 there is no rigid connection of the shaft 6 to the gear 9 , so that no movement of the push rods 4 can be initiated via the output shaft 12 .

List of the reference symbols used

1 housing
2 cylinders
3 a, b pistons (reciprocating working and compression pistons)
4 push rod (rack)
5 driving elements (gear)
6 wave
7 entrainment elements (gear)
8 freewheel
9 gear
10 output gear
11 leadership
12 output shaft

Claims (1)

Two-stroke reciprocating piston engine without crank drive with cylinders arranged in series, characterized in that two pistons ( 3 a, 3 b) with connecting rods ( 4 ) are connected to one another by the shaft ( 6 ) with the entrainment elements ( 7 ) and via a mechanical one or magnetically hydraulic, electronically controlled freewheel ( 8 ) with gear ( 9 ) engage in an output gear ( 10 ) and thus convert the linear movement of the pistons ( 3 a, 3 b) with the push rods ( 4 ) into a rotational movement.