DE2935977A1 - Piston engine with double connecting rod - has connecting rod in two hinging sections attached by lever to housing - Google Patents

Abstract

The piston engine incorporates a piston (2) coupled to the crankshaft (5) via two connecting rod sections (3,4) hinging together. The adjacent ends of these sections are attached to a control lever (7) in a bearing on the engine housing. With each revolution of the crankshaft a working stroke, a charging stroke and a compression stroke take place in the cylinder (1). The scavenge air or fuel/air mixture can be admitted through valves, while the exhaust is discharged through piston-controlled slots (10) in the cylinder.

Description

Eva Scherf, 8431 Kemnath

Reciprocating mator

The invention relates to a reciprocating engine, which by corresponding Design is improved in its performance.

It is known that the performance of reciprocating piston engines is positive due to the longer residence times of the pistons in the top dead center to influence. For this purpose, connecting rods formed by connecting rod sections are used in a known engine, which are hinged to pivot levers mounted next to the cylinder on the motor housing. The longer residence times of the However, the disadvantage of pistons is the formation of high temperatures

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doors with a corresponding heat transfer to the motor housing and a high proportion of nitrogen oxides in the exhaust gases.

It is the object of the invention in a reciprocating piston engine to take measures to increase performance while excluding these disadvantages to accomplish.

According to the invention, this object is achieved in that the piston is connected via two connecting rod sections articulated to one another, with the facing ends on a pivot lever mounted next to the cylinder on the motor housing attack is connected to the crankshaft and that with each revolution of the crankshaft a work cycle, a charging cycle and a compression stroke takes place in the cylinder. In a preferred embodiment, the scavenging air or the fuel-air mixture is used supplied to the cylinder interior via valves and the The exhaust gases are discharged through piston-controlled slots. In the engine formed in this way, the connecting rod leads to displacement during the work cycle to a lengthened stroke of the piston downwards and to a longer compression path as well as lengthened Charging times over the duration of the available angles of rotation on the crankshaft, during the three-stroke sequence enables a work cycle with each rotation of the crank heater. The longer piston stroke down allows the exhaust gas

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to shift the slots either in the direction of the bottom dead center or, if left in the cylinder wall, the charging cycle to extend.

According to a further invention, the valves can be operated as required, e.g. via camshafts or rods. It corresponds to the idea of the invention to operate the valves also by electromagnets, which the mechanical effort help reduce the engine. In a further development of the invention, the valves themselves can be dependent on load, pressure or speed be controllable.

Finally, the invention proposes variations in design of the reciprocating engine in that the two connecting rod sections and / or the crankshaft radius and / or the length of the pivot lever or the distance between the bearing point for the pivot lever and the longitudinal axis of the crankshaft are changeable. This gives the possibility, e.g. the piston speed in the top dead center at to change constant speed, whereby an influence on the combustion process is given. Also is a torque gain can be achieved which, as tests have shown, up to A times the value of a normal reciprocating piston engine can increase in the work cycle and lead to a corresponding

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the reduction in the compression stroke leads. Beyond that In addition to its control function, however, the swivel lever takes over also has the effect of a cross head and in this way reduces the lateral friction of the piston, if necessary up to a quarter of the normal reciprocating engine. The faster plunging of the piston achieved in the work cycle also results a faster expansion of the combustion gases and a greater temperature utilization of the energy or cheaper thermal load for the reciprocating engine and less nitrogen oxides.

The invention is illustrated using an exemplary embodiment shown schematically in the drawing. Here in demonstrate:

Fig. 1 shows a reciprocating piston engine in the position at the beginning of the work cycle,

Fig. 2 shows a reciprocating piston engine in the position at the beginning of the charging cycle and

3 shows a reciprocating piston engine in the position at the beginning of the compression stroke.

In the figures, 1 is the cylinder of a reciprocating piston engine and with 2 designates a piston, via connecting rod sections 3, 4, the piston 2 is connected to the crankshaft 5

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brings the connecting rod sections. 3, 4 with their mutually facing ends at 6 on a pivot lever 7 attack in an articulated manner, which is supported by a preferably adjustable bearing 8 on the motor housing 9. At 13 is a Gudgeon pin and 14 denotes a crankshaft journal.

In Fig. 1, the piston 2 assumes the top dead center position. During the following work cycle, the piston 2 moves downwards. The piston movement is caused by the kinematics of the connecting rod sections 3, 4 and the pivot lever 7 opposite a normal reciprocating engine with a small angle of rotation, about 85, with increased piston speed, when overrun of the outlet slot 10 through the piston, the working cycle is ended.

In the position of the piston 2 in FIG. 2, the charging cycle begins. This is done according to the type of reciprocating engine the inlets 12 controlled by valves 11 introduced either air or a fuel-air mixture into the cylinder. The piston 2 moves at a large angle of rotation of the crankshaft, approximately 146, by a partial stroke further down to the bottom dead center and further to the position of FIG. 3. The flushing and the charge exchange can thus take place over an extremely long period of time take place.

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With further rotation of the crankshaft 5 beyond the position of FIG. 3, the compression stroke takes place. the Connecting rod division allows in connection with the crosshead effect of the pivot lever 7 an upward movement of the Piston 2 with little power requirement.

It goes without saying that the reciprocating piston engine thus formed is equally can be used as a gasoline or diesel engine, with the latter also having direct injection without an antechamber can.

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Claims (6)

Eva Scherf, 8431 Kemnath Claims M / reciprocating engine, characterized in that the piston (2) via two articulated connecting rod sections (3, 4), the ends facing one another on a control lever mounted next to the cylinder (1) on the motor housing (7) attack is connected to the crankshaft (5) and that with each revolution of the crankshaft (5) a work cycle, a charging cycle and a compression cycle take place in the cylinder (1). 2. Reciprocating piston engine according to claim 1, characterized in that the scavenging air or the fuel-air mixture via valves (11) and the exhaust gases can be fed into or removed from the cylinder (1) via piston-controlled slots (10). - / 2 13001 1/0504 3. Reciprocating engine according to claim 2, characterized in that that the valves (11) can be actuated by electromagnets. 4. Reciprocating engine according to claim 2, characterized in that the valves (11) can be actuated by camshafts or linkages are. 5. Reciprocating engine according to claim 3 or 4, characterized in that the valves (11) are dependent on load, pressure or speed are automatically controllable. 6. Reciprocating engine according to one or more of the preceding claims, characterized in that the two connecting rod sections (3, 4) and / or the radius of the crankshaft (5) and / or the length of the pivot lever (7) or the distance the bearing point for the pivot lever (7) are designed to be changeable relative to the longitudinal axis of the crankshaft. - / 3 1 3 0 0 1 ^{1/0 5 0 A COPY}