CN2561944Y - Double crankshaft engines - Google Patents

Abstract

The utility model is a novel double-crank engine, which comprises a cylinder block, a crank arm connecting mechanism, a piston component, as well as a driving mechanism of a four-stroke engine. The utility model is characterized in that the engine removes a gas distributing system in the cylinder head of the original engine, utilizes the space in the cylinder head to relatively arrange a two-stroke engine, the cylinders of the two engines are communicated, and share an air inlet and exhaust duct of the two-stroke engine arranged on the cylinder wall, and a right-time chain wheel of the small chain wheel driving mechanism of the original four-stroke engine is arranged on the two-stroke engine crank. The engine adds a driving force input of the two-stroke engine on the basis of the original four-stroke engine, thereby significantly improving the engine power, and increasing the stability of the driving force output with simple and compact structure.

Description

Novel twin crankshaft engine

Technical field

The utility model belongs to the vehicle motor technical field, is specifically related to a kind of novel twin crankshaft engine.

Technical background

What use was more on the present motorcycle is four stroke engine, and its structure comprises cylinder block, cylinder head, connecting rod, piston assembly, driving mechanism and the gas distribution system etc. of four stroke engine.The characteristics of four stroke engine are that piston is whenever done four to-and-fro motion, and igniting once has that fuel consumption is low, the advantage of good economy performance in the cylinder, but still has many deficiencies:

At first, because they are in the middle of four strokes of piston, has only a stroke work by combustion, be that 720 ° of crankshaft operations are a work cycle, a bent axle Rotate 180 ° during acting, all the other crankshaft operations of 3/4 are finished by the inertia of flywheel, cause the power output of motor unstable like this, when especially turning round when low speed.

In addition, existing four stroke engine structure is complicated, and power consumption is big, and especially the gas distribution system of being made up of camshaft, rocking arm, valve, valve spring etc. is carried out distribution, makes the power of motor want loss about 15% at this.

Summary of the invention

The purpose of this utility model is at existing four stroke engine above shortcomings, design a kind of novel twin crankshaft engine, cylinder head structure partly to original four stroke engine changes, cancel former distribution system, a two stroke engine is set, the inlet and outlet road that shared two stroke engine is special to improve engine power, increases the stability of power output.

To achieve these goals, the utility model is by the following technical solutions:

Novel twin crankshaft engine, the cylinder block, connecting rod, piston assembly and the driving mechanism that comprise four stroke engine, be characterized in: the interior gas distribution system of cylinder head that has removed former motor, utilize the space in the cylinder head to be oppositely arranged a two stroke engine, the cylinder of two motors communicates, shared two stroke engine be located at intake and exhaust port on the cylinder wall, the timing sprocket of the minor sprocket driving mechanism of former four stroke engine is assemblied on the bent axle of two stroke engine.

The above-mentioned structure that is arranged on the two stroke engine in the cylinder head comprises: go up bent axle, upper piston, go up the bent axle wrist pin, go up crankshaft-link rod, go up bent axle support and intake duct, air outlet flue.Last bent axle support and cylinder head are fixed, last bent axle is assemblied on the bent axle support, fit on crankshaft-link rod on the last bent axle, last crankshaft-link rod connects upper piston by last bent axle wrist pin, upper piston is assemblied in downwards in the two-stroke cylinder that cylinder head central authorities leave, this cylinder is communicated with the cylinder of former four stroke engine downwards, have intake duct and air outlet flue on the cylinder wall of two stroke engine, intake duct is provided with one-way valve, spark plug is arranged at the two stroke engine bottom, and its front end stretches to the firing chamber.

The working principle of this motor is as follows: minor sprocket drive mechanism on the former four stroke engine drives timing sprocket with 2: 1 rotation speed operation.We are decided to be 0 ° of analysis to the lower dead center of the top dead center of four stroke engine, two stroke engine (work constantly): behind the engine ignition, the pressure of combustion gas promotes the four stroke engine piston and runs to lower dead center from top dead center, bent axle turns to 180 ° from 0 °, the two stroke engine piston runs to 1/2 of cylinder stroke from lower dead center simultaneously, inlet and outlet this moment mouth also is not opened, working stroke finishes, referring to Fig. 3 B; Flywheel inertia promotes, piston is up to top dead center from lower dead center, bent axle turns to 360 ° from 180 °, the piston of two stroke engine continues to be up to top dead center simultaneously, bent axle turns to 180 ° from 90 °, and this moment, relief opening was opened fully, and the waste gas in two cylinders ejects from air outlet flue simultaneously, finish exhaust stroke, referring to Fig. 3 C; The piston of four stroke engine goes downwards to lower dead center from top dead center again, be that bent axle runs to 540 ° from 360 °, this moment, the one-way valve of intake valve was opened, produce bigger degree of vacuum in the cylinder, under the effect of degree of vacuum, gas-air mixture is sucked cylinder, the piston of two stroke engine runs down to 1/2 of cylinder from top dead center simultaneously, close suction port, finish aspirating stroke, referring to Fig. 3 D; The piston of four stroke engine is up to top dead center from lower dead center again, bent axle runs to 720 ° from 540 °, finish four strokes, the piston of two stroke engine continues descending band lower dead center down simultaneously, bent axle runs to 360 °, finish two strokes, this moment, the compression stroke of motor was also finished, referring to Fig. 3 A.More than four stroke cycle reciprocal, just make the motor continuous running, outputting power.

The utility model has the advantages that:

1, improve engine power: original four stroke engine, by the gimmal transmission, gas distribution system is realized distribution by camshaft, rocking arm, valve, valve spring, makes engine power loss about 15%.And this twin crankshaft engine changes the gas distribution system of former motor into a two stroke engine, distribution is finished by the special air flue of two stroke engine, finish two simultaneous firings after the distribution, at the power that does not have to have increased again under the situation of kinetic equation loss the two stroke engine input, therefore be that engine power increases greatly, increase can reach 100%.

2, power output is more stable, low turn round more smooth and easy: 720 ° of original four stroke engine crankshaft operations are a work cycle, totally four strokes, but acting only account for one of them stroke, promptly crankshaft operation is 180 °, remaining 3/4 running all is to finish by flywheel inertia.And this motor top has increased a two stroke engine, crankshaft rotating is a work cycle for 360 °, and two simultaneous firings can form mutually and drag up and down, and power output is with stable, and under the little situation of flywheel inertia, engine running also can be freely smooth and easy when low speed.

Description of drawings

Fig. 1 is a structural drawing of the present utility model;

Fig. 2 is a plan view of the present utility model;

Fig. 3 A, Fig. 3 B, Fig. 3 C, Fig. 3 D are compression of the present utility model, outburst, exhaust and air inlet

The fundamental diagram of four strokes.

Embodiment

Referring to Fig. 1 and Fig. 2, the bottom of this novel twin crankshaft engine has kept following all structural types of cylinder head of four stroke engine, the cylinder block 4, crank-connecting rod 1, piston 3 and the wrist pin 2 that comprise four stroke engine, also comprise gimmal driving mechanism etc., because of cylinder is not made change with the bottom, the Therefore, omited detailed structure view of this part.This motor has removed the interior gas distribution system of cylinder head of former motor, utilize the space in the cylinder head to be oppositely arranged a two stroke engine, the structure of two stroke engine comprises bent axle 17, upper piston 14, last bent axle wrist pin 13, goes up crankshaft-link rod 12, last bent axle support 10 and intake duct 5, air outlet flue 11.Last bent axle support 10 is fixing with cylinder head 16, last bent axle 17 is assemblied on the bent axle support 10, fit on crankshaft-link rod 12 on the last bent axle 17, last crankshaft-link rod 12 connects upper piston 14 by last bent axle wrist pin 13, upper piston 14 is assemblied in downwards in the two-stroke cylinder 18 that cylinder head 16 central authorities leave, and this two-stroke cylinder 18 is communicated with the cylinder 19 of former four stroke engine downwards.Intake duct 5 and air outlet flue 11 are opened respectively on the cylinder wall of two stroke engine, and intake duct 11 is provided with one-way valve 7, external suction tude 6.Spark plug 15 is arranged at the two stroke engine bottom, and its front end stretches to the firing chamber.The timing sprocket 9 of the minor sprocket driving mechanism of former four stroke engine is assemblied on the last bent axle 17 of two stroke engine, and timing chain 8 is assemblied on the timing sprocket 9.

Claims (2)

1, novel twin crankshaft engine, the cylinder block, connecting rod, piston assembly and the driving mechanism that comprise four stroke engine, it is characterized in that removing the interior gas distribution system of cylinder head of former motor, utilize the space in the cylinder head to be oppositely arranged a two stroke engine, the cylinder of two motors communicates, shared two stroke engine be located at intake and exhaust port on the cylinder wall, the timing sprocket of the minor sprocket driving mechanism of former four stroke engine is assemblied on the bent axle of two stroke engine.

2, novel double throw engine according to claim 1 is characterized in that the structure of the two stroke engine that is provided with in the cylinder head comprises bent axle, upper piston, goes up the bent axle wrist pin, goes up crankshaft-link rod, upward bent axle support and intake duct, air outlet flue; Last bent axle support and cylinder head are fixed, last bent axle is assemblied on the bent axle support, last bent axle fit on crankshaft-link rod, last crankshaft-link rod connects upper piston by last bent axle wrist pin, upper piston is assemblied in downwards in the two-stroke cylinder that cylinder head central authorities leave, this cylinder is communicated with the cylinder of former four stroke engine downwards, have intake duct and air outlet flue on the cylinder wall of two stroke engine, intake duct is provided with one-way valve, spark plug is arranged at the two stroke engine bottom, and its front end stretches to the firing chamber.

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