CN2679374Y - Multi-stricking piston, two-stroke I.C. engine - Google Patents

Abstract

The utility model provides a multi-stroke piston type two-stroke internal combustion engine without a crankshaft and a connecting rod, including a body, a power output shaft, a power transmission cam, a power assembly, a gas distribution cam, a power output shaft, a power transmission cam, and a gas distribution cam The three are coaxially connected, and the power assembly is located between the power transmission cam and the gas distribution cam. The power assembly includes a cylinder group, and the two ends of the cylinder group are respectively connected with the gas distribution cam and the power distribution cam. Under the same conditions, the output power of the utility model is much higher than that of the traditional internal combustion engine. Since there are no moving parts (crankshaft and connecting rod) that the traditional internal combustion engine must have and require high manufacturing precision, the friction parts that are easy to wear are reduced, so it has a structure Simple, easy to manufacture, small in size, light in specific weight, high in transmission efficiency, high in output power, easy in maintenance, and low in cost.

Description

Multi-stroke piston two-stroke internal combustion engine

Technical field

The utility model relates to an internal combustion engine, in particular to a multi-stroke piston type two-stroke internal combustion engine.

Background technique

In a traditional four-stroke internal combustion engine, each cylinder can only do work once every two revolutions (720°) of the crankshaft. In a traditional two-stroke internal combustion engine, each cylinder can do work twice in every two revolutions (720°) of the crankshaft, that is, it can do one work per revolution (360°), and the output power is obviously higher than that of a four-stroke internal combustion engine. In order to obtain higher power, a piston-type double-acting internal combustion engine has appeared in the past, and both ends of the piston in a cylinder perform work, so the output power is one step higher than that of the two-stroke internal combustion engine. The crank-and-rod mechanism is the same, and there is a piston rod integrated with the piston between the piston and the connecting rod at the other end; because the piston rod occupies part of the working volume, its output power is also reduced; in addition, because the piston at this end is also To work under high temperature and high pressure, in addition to the same seal as the traditional internal combustion engine, it is also necessary to seal between the piston rod and its related fixing parts, so the structure is relatively complicated and bulky, and there are too few on low-speed engines. use. In the invention patent application with the application number 02135567.3, "a rotary piston internal combustion engine" is disclosed. This rotary piston internal combustion engine consists of a power shaft, a cam row, a piston push rod, a piston row, an exhaust cylinder, and a The discharge cock, spark plug, inlet cylinder, inlet cock, inlet piston push rod, inlet cam and other components are connected. Although there is no reciprocating mechanism such as a crankshaft connecting rod, it still has a large volume, complex structure, difficult manufacturing, and technical problems. Complicated, the cock is not easy to seal, and has the disadvantages of poor reliability in high-speed motion. And every time the cock of this internal combustion engine rotates one week, the exhaust cylinder also only does work once, so even if it can be realized, the output power provided is also small.

Contents of invention

The purpose of the utility model is to overcome the shortcomings of the existing internal combustion engine technology and provide a crankshaft-free, connecting rod-less, multi-stroke piston type two-stroke internal combustion engine with simple structure, light specific weight, small volume, large output power and wide application range.

The purpose of this utility model is achieved through the following technical solutions: the multi-stroke piston type two-stroke internal combustion engine mainly includes a body, a power output shaft, a power transmission cam, a power assembly, a gas distribution cam, a power output shaft, a power transmission cam, and a gas distribution cam The three are coaxially connected, and the power assembly is located between the power transmission cam and the air distribution cam, and is characterized in that: the power assembly includes a cylinder group, and the two ends of the cylinder group are respectively connected with the air distribution cam and the power transmission cam.

The number, diameter and piston stroke of the cylinders can be selected as required, and generally the number of cylinders included in the cylinder group is greater than or equal to 2.

The structure of the cylinder includes a cylinder head, a cylinder liner, and a piston group. The cylinder head is located at one end of the body and is sealed with the cylinder liner. The space between the cylinder liner and the body is divided into a cooling water chamber and an air chamber by a partition. Air intake holes are arranged on the cylinder liner to communicate with the air chamber and the cylinder space in the cylinder liner.

The cylinder head is provided with a rocker arm, a fuel injector and an exhaust valve. The exhaust valve passes through the cylinder head. The end of the exhaust valve located outside the cylinder head is connected with the rocker arm. The fuel injector passes through the cylinder head and extend into the cylinder. If the utility model is used for a gasoline engine, the fuel injector can also be arranged at the intake chamber outside the cylinder liner. If the utility model is used for gas or liquid pump machinery, then there is no need to install a fuel injector.

The structure of the piston group includes a piston body, a piston ring, and a roller frame. The piston ring is installed in the annular groove on the outer surface of the piston body. The roller frame is connected with the piston body by fastening screws. connected.

The roller frame includes a roller frame body, double-layer short cylindrical rollers, and positioning blocks. A fork-shaped groove is opened on the roller frame body, and the double-layer short cylindrical roller passes through the pin shaft of the fork-shaped groove and is connected in the fork-shaped groove for positioning. The block is also fixedly connected with the roller frame body.

An adjustment pad is arranged between the double-layer short cylindrical roller and the fork-shaped groove wall of the roller frame; the adjustment pad is used to adjust the axial position of the double-layer short cylindrical roller in contact with the power transmission cam and reduce friction.

The positioning block includes a positioning block seat and a positioning block body. The positioning block seat is connected with the roller frame through a small shaft. Stuck" phenomenon; the positioning block passes through the positioning block seat and is fixed on the positioning block seat.

The positioning block includes a shell, a steel ball, a spring seat plate, a spring, and an adjusting screw plug. There are through holes at both ends of the shell, and the spring in the shell pushes the steel ball against the through hole through the spring seat plate, so that the steel ball part The casing is exposed, and the adjusting screw plug of the adjustable spring pressing force on the steel ball is screwed into one end of the casing and compresses the spring. Under the action of the spring, the steel ball can ensure that the piston group is compatible with the power transmission cam at any time. In addition, it can also keep the roller frame and the power transmission cam at the set position, so as to avoid the collision between the two sides of the roller frame and the outer edge of the plane power transmission cam when the piston group rotates along its own axis.

In order to generate greater output power, the utility model can also design the end surface line shape of the power transmission cam into multiple groups of curves; during one rotation of the power transmission cam, one cylinder group can output power multiple times, thereby obtaining higher power than the aforementioned internal combustion engine. power.

The working principle of the utility model is as follows: when the piston group moves to the compression top dead center in the cylinder, the fuel injector injects fuel into the cylinder, the fuel burns to do work, and pushes the piston group to move according to the curve law set by the power transmission cam , the power transmission cam rotates under the push of the piston and drives the power output shaft to output power; when the piston group moves to the set moment, the exhaust valve opens to discharge exhaust gas, and the piston group continues to move to the set position on the cylinder liner , the intake port is opened, fresh air enters and expels exhaust gas, until the valve cam closes the exhaust valve, the piston group returns to close the intake port, the compression process starts, the piston group moves to the compression top dead center in the cylinder, and Then enter the next working cycle, so the repeated cycle can realize continuous work on the power output shaft. The number of times of work done by the piston group in one revolution of the power output shaft depends on the number of curves set on the power transmission cam and the gas distribution cam and the cooperation.

Compared with the prior art, the utility model has the following advantages and effects: in one revolution of the power output shaft, each cylinder of the cylinder group can do work multiple times, so the torque fluctuation is small, the output impact is small, and the operation is relatively stable; Reasonable, so the utility model not only has a higher output power than the traditional internal combustion engine under the same conditions, but also reduces the friction parts that are easy to wear because there are no moving parts (crankshaft and connecting rod) that the traditional internal combustion engine must have and require high manufacturing precision , so it has the advantages of simple structure, convenient manufacture, small size, light specific weight, high transmission efficiency, large output power, convenient maintenance, low cost, etc.; and according to the different power and use requirements, the utility model can be combined into different cylinders The serialized variants of the number and bore diameter are applicable to a wide range of applications.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Fig. 2 is a schematic cross-sectional view of the utility model.

Fig. 3 is a linear schematic diagram of the power transfer cam of the present invention.

Fig. 4 is a schematic structural view of the piston group of the present invention.

Fig. 5 is a view of the bottom end face of the piston group shown in Fig. 4 .

Fig. 6 is a schematic structural view of the positioning block in the piston group shown in Fig. 4 .

Fig. 7 is a top view of the positioning block shown in Fig. 6 .

Detailed ways

Below in conjunction with embodiment and accompanying drawing, the utility model is described in further detail, but the utility model

Embodiments are not limited thereto.

Example

In order to illustrate the specific structure of the multi-stroke piston type two-stroke internal combustion engine of the present invention, an embodiment of a two-stroke piston type two-stroke 4-cylinder machine is shown in Fig. 1 to Fig. 2; as can be seen from Fig. 1, the internal combustion engine includes body 1 , gas distribution cam 2, power transmission cam 6, power output shaft 7 and cylinder group, the power output shaft 7, power transmission cam 6, and gas distribution cam 2 are coaxially connected, and the line pattern of power transmission cam 6 is shown in Figure 3 (the gas distribution cam 2 is also similar, but the line type is different), the piston group 4 moves according to the line pattern composed of circular arcs R1, R2 and straight line L on the working surface of the power transfer cam 6, so as to ensure that it is in most of the working stroke All are constant speed motions; the cylinder group is located between the power transmission cam 6 and the gas distribution cam 2, and the two ends of the cylinder group are respectively connected with the gas distribution cam 2 and the power transmission cam 6, and the cylinder group includes four cylinders. The structure of the cylinder includes a cylinder head 3, a piston group 4, and a cylinder liner 5. The cylinder head 3 is located at one end of the cylinder liner 5 and is tightly connected with the cylinder liner 5. The cylinder head 5 is provided with a rocker arm 8, a fuel injector 9 and a row Valve 10, the exhaust valve 10 passes through the cylinder head 3, the end of the exhaust valve 10 located outside the cylinder head 3 is connected to and driven by the rocker arm 8, and the rocker arm 8 is in contact with the valve cam 2 Connected and driven by it, the fuel injector 9 extends into the cylinder through the cylinder head 3; the space between the cylinder liner 5 and the body 1 is divided into a cooling water cavity 11 and an air chamber 12 by a partition, on the cylinder liner 5 There is an air inlet 13 to communicate with the cylinder space in the air chamber 12 and the cylinder liner 5; the structure of the piston group 4 is shown in Figures 4 to 5, and it can be seen from Figures 4 and 5 that the piston group 4 includes pistons Body 14, piston ring 15 and roller frame, piston ring 15 is installed in the annular groove of piston body 14 outer surface, roller frame and piston body 14 are connected by fastening screw 16, and roller frame includes roller frame body 17, double-layer short Cylindrical roller 18, positioning block 20, have fork-shaped groove on roller frame body 17, double-layer short cylindrical roller 18 is connected in the fork-shaped groove by the bearing pin passing through fork-shaped groove, double-layer short cylindrical roller 18 and fork Adjustment pads 19 are arranged between the two sides of the shaped groove, and the positioning block 20 is also fixedly connected with the roller frame body 17. The structure of the positioning block 20 is shown in Figure 6 and Figure 7, as can be seen from Figure 6 and Figure 7, the positioning block 20 includes Positioning block seat 30, positioning block body 21, positioning block seat 30 is connected with roller frame body 17 by small shaft 29, gasket 22, pin 31, and positioning block seat 30 can rotate relatively with roller frame around small shaft 29, to adapt to The curve change of the power transmission cam 6; two positioning blocks 21 pass through the positioning block seat 30 and are fixed on the positioning block seat 30 by lock nuts 24 and cotter pins 26. The structure of the positioning block body 21 is shown in Figure 6, including the shell , steel ball 28, spring seat plate 23, spring 27, adjusting screw plug 25, there is a through hole in the center of the shell, and the spring 27 in the hole compresses the steel ball 28 at the lower end opening through the spring seat plate 23, so that the steel ball 28 Part of the shell is exposed, and the adjusting screw plug 25 is screwed into the other end of the shell and compresses the spring 27. The adjusting screw plug 25 can adjust the pressing force of the spring 27 on the steel ball 28. Under the action of the spring 27, the steel ball 28 can ensure that the piston Group 4 is compatible with power transmission cam 6 at any time. The positioning block can keep the roller frame and the power transmission cam 6 at a set position, so as to avoid the collision of the piston group 4 with the power transmission cam 6 outer edge when the piston group 4 rotates along its own axis.

The working principle of this multi-stroke piston type two-stroke internal combustion engine is as follows: when the piston group 4 moves to the compression top dead center in the cylinder, the fuel injector 9 injects fuel into the cylinder, and the fuel burns to do work, and pushes the piston group 4 to transmit work The curve set by the cam 6 moves regularly, and the power transmission cam 6 rotates under the push of the piston group 4 and drives the power output shaft 7 to output power; when the piston group 4 moves to the set moment, the exhaust valve 10 opens to discharge exhaust gas , when the piston group 4 continues to move to the set position on the cylinder liner 5, the intake hole 13 opens, fresh air enters and expels exhaust gas, until the valve cam 2 closes the exhaust valve, and the piston group 4 returns to close the intake hole 13 is closed, the compression process starts, the piston group 4 has been moving to the compression top dead center in the cylinder, and then enters the next working cycle, so repeated cycles can achieve continuous work on the power output shaft 7. The four cylinders of this multi-stroke piston type two-stroke internal combustion engine are divided into two groups symmetrically on the power output axis, and the two symmetrical cylinders form a group. When doing work, the two cylinders of each group do work at the same time, so each cylinder does work twice in one revolution of the power output shaft, so that the 4-cylinder internal combustion engine of the present utility model has twice the working displacement, thus It can theoretically output twice as much power as a general two-stroke internal combustion engine.

Claims (8)

1. A multi-stroke piston type two-stroke internal combustion engine, comprising a power assembly, a body (1), a power output shaft (7), a power transmission cam (6), a gas distribution cam (2), a power output shaft (7), a transmission The power cam (6) and the gas distribution cam (2) are coaxially connected, and the power assembly is located between the power transmission cam (6) and the gas distribution cam (2). It is characterized in that: the power assembly includes a cylinder group, and the The two ends of described cylinder group are respectively connected with gas distribution wheel (2) and power transfer cam (6). 2. The multi-stroke piston type two-stroke internal combustion engine according to claim 1, characterized in that: the number of cylinders included in the cylinder group is greater than or equal to two. 3. The multi-stroke piston type two-stroke internal combustion engine according to claim 1, characterized in that: the structure of the cylinder includes a cylinder head (3), a cylinder liner (5), a piston group (4), a cylinder head (3) Located at one end of the cylinder liner (5) and sealed with it, the space between the cylinder liner (5) and the machine body (1) is divided into a cooling water chamber (11) and an air chamber (12) by a partition. In the cylinder liner (5) An air intake hole (13) is opened on the top to communicate with the cylinder space in the air chamber (12) and the cylinder liner (5). 4. The multi-stroke piston type two-stroke internal combustion engine according to claim 3, characterized in that: the cylinder head (3) is provided with a rocker arm (8), a fuel injector (9) and an exhaust valve (10) , the fuel injector (9) extends into the cylinder through the cylinder head (3), the exhaust valve (10) passes through the cylinder head (3), and its end outside the cylinder head (3) is connected to the rocker arm (8 ) are connected. 5. The multi-stroke piston type two-stroke internal combustion engine according to claim 3, characterized in that: the piston group (4) includes a piston body (14), a piston ring (15) and a roller frame, and the piston ring (15) is installed In the annular groove on the outer surface of the piston body (14), the roller frame is connected with the piston body (14) by fastening screws (16), and the roller frame is connected with the power transmission cam (6) simultaneously. 6. The multi-stroke piston-type two-stroke internal combustion engine according to claim 5, characterized in that: the roller frame includes a roller frame body (17), double-layer short cylindrical rollers (18), and positioning blocks (20). Have forked groove on the frame body (17), double-deck short cylinder roller (18) is connected in the roller frame body (17) by bearing pin, and positioning block (20) is fixedly connected with roller frame body (17). 7. The multi-stroke piston type two-stroke internal combustion engine according to claim 6, characterized in that: the positioning block (20) includes a positioning block seat (30) and a positioning block body (21), and the positioning block seat (30) passes through The small shaft (29) is connected with the roller frame, and the positioning block (21) passes through the positioning block seat (30) and is fixed on the positioning block seat (30). 8. The multi-stroke piston type two-stroke internal combustion engine according to claim 7, characterized in that: the positioning block includes a shell, a steel ball (28), a spring seat plate (23), a spring (27), an adjusting screw plug (25), the shell is a through hole, and the spring (27) in the shell presses the steel ball (28) on the opening at one end by the spring seat plate (23), so that the steel ball part is exposed from the shell, and is connected with the power transmission cam (6) contact, the adjusting screw plug (25) is screwed into the other end of the shell and compresses the spring (27).

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