CN111140396A

CN111140396A - Engine with wedge-shaped hole piston

Info

Publication number: CN111140396A
Application number: CN201911197250.8A
Authority: CN
Inventors: 叶晓波; 其他发明人请求不公开姓名
Original assignee: Ningbo Daye Garden Equipment Co Ltd
Current assignee: Ningbo Daye Garden Equipment Co Ltd
Priority date: 2019-11-22
Filing date: 2019-11-22
Publication date: 2020-05-12

Abstract

A cavity (41) communicated with the interior of each wedge of an engine with a wedge hole piston is provided, and the space of the cavity is arranged between the piston surface of an engine piston (17) and the layer surface of the upper part of a piston pin hole of the piston pin end of the engine piston (17) to form a buffer gap and a noise reduction space; each wedge is provided with at least one escape hole (42) so as to communicate with the plurality of through holes (32) and the oval inlet (34) through the interior of each wedge to the cavity (41) for buffering and noise reduction.

Description

Engine with wedge-shaped hole piston

Technical Field

The invention relates to an automatic clamping and positioning mechanism and method for simultaneously mounting two G-shaped elastic pads at the pin end of a small engine piston and an engine with a piston with a wedge-shaped hole, belonging to the technical field of pistons and crank connecting rods of internal combustion engines.

Background

The assembly of the piston with the crank-connecting rod has great potential to be excavated. At present, the automatic clamping and positioning mechanism and the method for simultaneously installing two G-shaped elastic pads at the piston pin end of a small engine are also characterized in that the piston and a crank connecting rod are assembled in a search, and the two G-shaped elastic pads cannot be simultaneously installed at the piston pin end of the small engine; the method comprises the steps that G-shaped elastic cushions are installed at the pin ends of pistons of the small-sized engine, and basically in a manual production mode, an operator manually installs a first G-shaped elastic cushion, to be clamped in a piston sinking groove, at the left end of each piston pin, of which a piston is connected with a crank connecting rod through the piston pin, and then manually installs a second G-shaped elastic cushion, to be clamped in the piston sinking groove, at the right end of each piston pin, of which the piston is connected with the crank connecting rod through the piston pin; because the G-shaped elastic cushion is elastic and has a variable outer diameter; the diameter of the piston pin is 8mm, the major diameter of the piston sinking groove is 10mm, namely, the G-shaped elastic pad with the major diameter of 10mm is held and compressed to 8mm by hand pliers and pushed into the piston sinking groove, and then the G-shaped elastic pad is restored to the major diameter of 10 mm; and a first G-shaped elastic cushion in the piston sinking groove at the left end of the piston pin is completely installed, and a second G-shaped elastic cushion in the piston sinking groove at the right end of the piston pin is also installed. Not only is the labor intensity of workers high and the production efficiency low, but also the G-shaped elastic cushion is deformed due to overlarge operation force or is not properly assembled due to too small operation force. With the increase of labor cost and the appearance of wasted labor, the automatic production of simultaneously mounting two G-shaped elastic cushions at the pin end of the piston of the small-sized engine is urgent, but the expensive full-automatic high-precision equipment is too expensive, so that enterprises are difficult to bear; how to flexibly assemble the piston and the elastic pad of the crank connecting rod, and a mechanism and a method for simultaneously installing two G-shaped elastic pads at the pin end of the piston of a small-sized engine are sought, which is a long-standing problem related to energy conservation and emission reduction.

Disclosure of Invention

The assembly of the piston with the crank-connecting rod has great potential to be excavated. An automatic clamping and positioning mechanism and method for installing two G-shaped elastic pads at the pin end of a piston of a small engine simultaneously are disclosed. Aiming at the assembly of the piston and the crank connecting rod, two G-shaped elastic cushions cannot be arranged at the piston pin end of the small-sized engine at the same time; the method comprises the steps that G-shaped elastic cushions are installed at the pin ends of pistons of the small-sized engine, and basically in a manual production mode, an operator manually installs a first G-shaped elastic cushion, to be clamped in a piston sinking groove, at the left end of each piston pin, of which a piston is connected with a crank connecting rod through the piston pin, and then manually installs a second G-shaped elastic cushion, to be clamped in the piston sinking groove, at the right end of each piston pin, of which the piston is connected with the crank connecting rod through the piston pin; because the G-shaped elastic cushion is elastic and has a variable outer diameter; the diameter of the piston pin is 8mm, the major diameter of the piston sinking groove is 10mm, namely, the G-shaped elastic pad with the major diameter of 10mm is held and compressed to 8mm by hand pliers and pushed into the piston sinking groove, and then the G-shaped elastic pad is restored to the major diameter of 10 mm; the first G-shaped elastic cushion in the piston sinking groove at the left end of the piston pin is completely installed, and the second G-shaped elastic cushion in the piston sinking groove at the right end of the piston pin is also installed; not only the labor intensity of workers is high, the production efficiency is low, but also the G-shaped elastic cushion is deformed because of overlarge operation force, or the G-shaped elastic cushion is not properly installed because of too small operation force and too skew; with the increase of labor cost and the appearance of wasted labor, the automatic production of simultaneously mounting two G-shaped elastic cushions at the pin end of a piston of a small engine is urgent, but the situation that an enterprise cannot bear the high-cost full-automatic high-precision device is too expensive; the method for assembling the elastic pads of the piston and the crank connecting rod flexibly is a method for simultaneously installing two G-shaped elastic pads at the pin end of the piston of a small-sized engine, and solves the problem that the two G-shaped elastic pads cannot be installed at the same time.

The technical scheme and the method for solving the technical problem are as follows:

because only the inclined grooves are formed on the cylinder, the complicated mechanical hand containing a plurality of follow-up fingers is skillfully omitted to clamp the G-shaped elastic pad in an unfixed state in a deformation manner, and the device is simple, easy to operate, spectrum-dependent and easy to use; the core technology is that the angle of the chute is the included angle between the chute (2) of the clamping cylinder (1, 1b) provided with the chute (2) and the axis of the clamping cylinder; and the follow-up push-pull mechanism is composed of a main follow-up push plate, a cylinder push plate and a main follow-up pull block, so that over-restraint is overcome.

An automatic clamping and positioning mechanism for simultaneously mounting two G-shaped elastic pads at the pin end of a piston of a small engine is composed of clamping cylinders (1, 1b) provided with chutes (2), a main body guide seat (15), an anti-rotation stop block (13), a main push rod (8), a cylinder mounting seat (16), a cylinder (19), a cylinder push plate (21), a main follow-up push plate (20), a main follow-up pull block (22), an auxiliary clamp seat (23) and a machine seat (24), wherein the main body guide seat (15), the cylinder mounting seat (16) and the cylinder (19) are symmetrically and sequentially mounted on the left side and the right side of the middle part of the machine seat respectively; a piston (17) provided with a crank connecting rod and a piston pin is arranged in the middle of the engine base, and an auxiliary clamp seat (23) of an auxiliary clamp is arranged on the upper part of the middle of the engine base; the method is characterized in that: the clamping cylinders (1, 1b) provided with the inclined grooves (2) are symmetrically arranged in the main body guide seat (15) at the left and right sides, and the inclined grooves (2) are used for placing G-shaped elastic pads; the main push rod (8) is movably inserted into the clamping cylinders (1, 1b) provided with the inclined grooves (2); the end parts of the main body guide seats (15) are respectively provided with the anti-rotation stop blocks (13); the rear part of the main push rod (8) is provided with the main follow-up push plate (20); the movable extension part of the cylinder (19) is connected with the cylinder push plate (21); and the main follow-up pulling block (22) passes through the gap of the main follow-up push plate (20) and is connected with the cylinder push plate (21).

The improved automatic clamping and positioning mechanism for simultaneously mounting two G-shaped elastic pads at the end of a piston pin of a small engine is characterized in that: the included angle between the inclined groove (2) of the clamping cylinder (1, 1b) provided with the inclined groove (2) and the axis of the clamping cylinder is more than 1 degree; an axial through hole (3) is arranged in the clamping cylinders (1, 1b) provided with the inclined grooves (2) so as to facilitate the main push rod (8) to pass through; the chute is a radial through hole and is only communicated with the upper cylinder wall but not communicated with the lower cylinder wall; the chute is a rectangle with two parallel sides in a top view; it is longer than 10mm and wider than 0.8mm to fit loosely into the G-shaped elastic pad.

The improved automatic clamping and positioning mechanism for simultaneously mounting two G-shaped elastic pads at the end of a piston pin of a small engine is characterized in that: the inclined groove (2) of the clamping cylinder (1, 1b) provided with the inclined groove (2) and the axis of the clamping cylinder form an included angle of 1-38.66 degrees.

The improved automatic clamping and positioning mechanism for simultaneously mounting two G-shaped elastic pads at the end of a piston pin of a small engine is characterized in that: the clamping cylinder (1, 1b) provided with the chute (2) is characterized in that the included angle between the chute (2) and the axis of the clamping cylinder is 10-25 degrees.

The improved automatic clamping and positioning mechanism for simultaneously mounting two G-shaped elastic pads at the end of a piston pin of a small engine is characterized in that: the clamping cylinder is characterized in that the inclined groove (2) of the clamping cylinder (1, 1b) provided with the inclined groove (2) and the axis of the clamping cylinder form an included angle of 15-20 degrees.

The improved automatic clamping and positioning mechanism for simultaneously mounting two G-shaped elastic pads at the end of a piston pin of a small engine is characterized in that: the inclined groove (2) of the clamping cylinder (1, 1b) provided with the inclined groove (2) and the axis of the clamping cylinder form an included angle of 15.7-17.66 degrees.

The improved automatic clamping and positioning mechanism for simultaneously mounting two G-shaped elastic pads at the end of a piston pin of a small engine is characterized in that: the inclined groove (2) of the clamping cylinder (1, 1b) provided with the inclined groove (2) forms an included angle of 16.7 degrees with the axis of the clamping cylinder.

The improved automatic clamping and positioning mechanism for simultaneously mounting two G-shaped elastic pads at the end of a piston pin of a small engine is characterized in that: the main push rod (8) is provided with an anti-rotation platform (9).

The improved automatic clamping and positioning mechanism for simultaneously mounting two G-shaped elastic pads at the end of a piston pin of a small engine is characterized in that: the anti-rotation device is characterized in that an anti-rotation stop block (13) arranged at the end part of the main body guide seat (15) is provided with an anti-rotation groove (14) so as to be matched with an anti-rotation left platform (5) and an anti-rotation right platform (6) which are arranged on the clamping barrels (1, 1b) provided with the inclined grooves (2).

The improved automatic clamping and positioning mechanism for simultaneously mounting two G-shaped elastic pads at the end of a piston pin of a small engine is characterized in that: the clamping cylinder (1, 1b) provided with the chute (2) is provided with a left rotation preventing platform (5) and a right rotation preventing platform, and the head of the clamping cylinder is also provided with a clamping platform (4) so as to be matched with the piston.

The technical scheme and method adopted for solving the technical problems are an engine with a wedge-shaped hole piston; the automatic clamping and positioning mechanism for simultaneously mounting the two G-shaped elastic pads at the pin end of the piston of the small-sized engine can be used for production, but has the outstanding problem of high rejection rate. Many engine pistons have worn out inlets at the pin end of the piston to render the engine piston unusable; many proposals have been tried and found to be unsatisfactory for a few years, but have been solved by an unexpected solution, namely that the inlet of the piston pin end of the engine piston is not chamfered by the usual chamfer of the bore, and the two G-shaped elastic pads are directly mounted, so that the rejection rate is zero, and the piston pin end of the engine piston is successfully used for several years. The reason may be that a certain part of the G-shaped elastic cushion with the opening is inclined when abutting against the chamfer (d18) of the upper pin hole, so that the piston is scrapped and the piston is good without the chamfer, but the chamfer (d18) of the pin hole on the drawing of the engine piston is removed, and people do not think before, even if the know-how that the chamfer cannot be performed is disclosed now and probably people are not comfortable, the inlet of the piston pin end of the engine piston does not need the chamfer of the commonly used hole, has holes without the chamfer, and the rejection rate is zero in years, so that the practical effect is unexpected. According to the regulations for machine manufacturing, it is not conceivable that a significant bore such as the entrance of a piston pin end of an engine piston that fits a crankpin, generally speaking, is not the usual chamfer of the bore. On the contrary, under the accidental condition that the chamfer is forgotten to be processed, the piston without the chamfer is placed into an automatic clamping and positioning mechanism which is provided with two G-shaped elastic pads at the same time at the pin end of the piston of the small-sized engine, the rejection rate is known to be zero, then the piston pin and the crank connecting rod are assembled, and the whole machine test and export are carried out for several years to confirm the finding; the inlet of the piston pin end of the engine piston is improved into a pin corrugation inlet without common chamfer angles of holes, and the effect is remarkable. If the work is required to be performed without chamfering, burrs are often left.

The invention has the advantages that: the automatic production of improving the engine piston pin end and simultaneously installing two G-shaped elastic cushions is very urgent, but the expensive full-automatic high-precision equipment is too expensive, so that the current situation that enterprises cannot bear the equipment is difficult; the method is a method for simultaneously installing two G-shaped elastic cushions at the pin end of a piston of a small-sized engine, and solves the problem that the simultaneous installation of two G-shaped elastic cushions cannot be realized; the method is developed in practice for many years, is also a crystal of experience at home and abroad, and has the advantages of being beneficial to the auxiliary guidance of the piston to ensure the piston to be good, being beneficial to the auxiliary action on mixed gas to reduce the discharge of hydrocarbon, and being beneficial to the auxiliary lubrication and heat dissipation; the assembly precision and the product quality are improved; the labor intensity is reduced; promote the popularization and the application of mass automatic feeding equipment and improve the production benefit. The inlet of the piston pin end of the engine piston is not required to be chamfered by a common hole, and the part with the hole and without the chamfer is improved into a pin corrugation inlet, so that the effect is obvious. If the work is required to be performed without chamfering, burrs are often left. The partial assembly of the piston (17) with the cylinder (26) and the auxiliary port (28) also requires auxiliary effects.

an engine with a wedge-shaped hole piston, two G-shaped elastic cushions are simultaneously installed at the piston pin end of a small engine, and the engine is characterized in that the inlet of a piston pin hole at the piston pin end of the engine piston (17) is not required to be chamfered by a common hole, and the non-chamfered part of the hole at the inlet of the piston pin hole is improved into a wave inlet (25); the noise reduction wedges are sequentially arranged into outer layer noise reduction wedges (29), middle layer noise reduction wedges (30) and inner layer noise reduction wedges (31) in three circles from the outside to the center of a circle of the piston surface; the outer layer noise reduction wedges (29), the middle layer noise reduction wedges (30) and the inner layer noise reduction wedges (31) are arranged and combined in a plurality of arrays around the circular axis of the piston; the right section (33) of each wedge of the noise reduction wedges is in a trapezoid shape with a large bottom and a small upper part; the right section (33) of each wedge of the noise reduction wedges is in a trapezoid shape with a large bottom and a small upper part, and a through hole (32) is formed in the trapezoid shape; the outer layer noise reduction wedge (29), the middle layer noise reduction wedge (30) and the inner layer noise reduction wedge (31) are respectively provided with a through hole (32); the front section (33) of each wedge of the noise reduction wedges is in a shape of a trapezoid with a large bottom and a small upper part, and a cavity is arranged in each wedge with a through hole (32); the upper surface of each wedge of the plurality of noise reduction wedges is also provided with an oval inlet (34); the wave shape of the wave inlet is prepared by the following steps:

adopting PRO/ENGINEER WILDFIRE drawing software, newly setting a working catalog, newly building parts, and sketching 2 concentric circles;

opening a variable cross-section scanning (Var Sect Sweep) instruction, and selecting the 2 circles as a scanning track and a reference track;

drawing a straight line parallel to the 2-circle plane, wherein the length L is (D-D)/2, and the straight line corresponds to the projection line of the edge of the circle;

set-up PARAMETER (PARAMETER) 1: c real number (real number), which can be assigned between 0.01 and 1 according to specific working conditions, and is taken as 0.3;

set-up PARAMETER (PARAMETER) 2: n integer (integer), can follow the value of selecting between 2-100 according to the concrete working condition, choose 13; a relationship (relationship) is established, i.e. the sine wave equation is:

SDi＝C*SIN(TRAJPAR*360*N)

in the above formula, i is a size number serial number; SIN ═ SINE, SINE function; TRAJPAR, trace function;

then, adopting instructions of rotation, combination, materialization and the like;

firstly, manufacturing an electrode on tungsten copper by using a CNC machine tool, and then processing a waveform on a piston by using an electric spark machine tool;

an oil containing groove is further formed in a piston pin hole of the piston pin end of the engine piston (17), the oil containing groove is a wave-shaped extension of an inlet along the axial direction of the hole, and the formed groove is called as the oil containing groove to be beneficial to lubrication between the oil containing groove and the piston pin;

an engine with a wedge-escape hole piston adopts a spark plug (35) which is provided with a protective welding skin (36) and wraps beside a discharge electrode (38) so as to be beneficial to the loss of the discharge electrode (38) and a receiving electrode (35); the component of the protective welding skin (36) contains titanium dioxide.

Has the advantages that:

an engine with a wedge-shaped hole piston, two G-shaped elastic cushions are simultaneously installed at the piston pin end of a small engine, and the engine is characterized in that the inlet of a piston pin hole at the piston pin end of the engine piston (17) is not required to be chamfered by a common hole, and the non-chamfered part of the hole at the inlet of the piston pin hole is improved into a wave inlet (25); the two G-shaped elastic cushions are arranged at the pin end of the piston of the small engine at the same time, so that the small engine is convenient to prevent the shell from being clamped and waste products are avoided; arranging a plurality of noise reduction wedges on the piston surface of the engine piston (17) for further noise reduction, wherein the noise reduction wedges are sequentially arranged into an outer layer noise reduction wedge (29), a middle layer noise reduction wedge (30) and an inner layer noise reduction wedge (31) from three circles close to the circle center from the outside of an outer circle of the piston surface; the outer layer noise reduction wedges (29), the middle layer noise reduction wedges (30) and the inner layer noise reduction wedges (31) are arranged and combined in a plurality of arrays around the circular axis of the piston; the right section (33) of each wedge of the noise reduction wedges is in a trapezoid shape with a large bottom and a small upper part; the right section (33) of each wedge of the noise reduction wedges is in a trapezoid shape with a large bottom and a small upper part, and a through hole (32) is formed in the trapezoid shape; the outer layer noise reduction wedge (29), the middle layer noise reduction wedge (30) and the inner layer noise reduction wedge (31) are respectively provided with a through hole (32); the front section (33) of each wedge of the noise reduction wedges is in a shape of a trapezoid with a large bottom and a small upper part, and a cavity is arranged in each wedge with a through hole (32). When noise airflow in the process of pressure inlet and explosion is rushed in from a through hole (32) formed on a trapezoid with a large bottom and a small upper part of a right section (33) of each wedge of the plurality of noise reduction wedges, when the noise airflow in the pressure-entering and explosion-exhausting process is punched in from the through hole (32) formed on the trapezoid with the large bottom and the small upper part of the right section (33) of each wedge of the plurality of noise-reducing wedges and the oval inlet (34) formed on the upper surface of each wedge of the plurality of noise-reducing wedges, the noise airflow is compressed and then enters the cavity formed in each wedge to be expanded, and then the expanded noise airflow is compressed again from the through hole (32) opened by each wedge of the plurality of noise reduction wedges, overflows to the outside and is expanded again, so that the noise reduction effect of the noise reduction wedges, which is compressed and expanded again and consumes the energy of the noise airflow, is achieved. The manufacturing method of the waveform of the wave inlet has the advantages of high precision:

set-up PARAMETER (PARAMETER) 2: n integer (integer), can follow the value of selecting between 2-100 according to the concrete working condition, choose 13; a relationship (relationship) is established, i.e. the sine wave equation of the present application is:

SDi＝C*SIN(TRAJPAR*360*N)

an oil containing groove is further formed in a piston pin hole of the piston pin end of the engine piston (17), the oil containing groove is a wave-shaped extension of an inlet along the axial direction of the hole, the formed groove is called as the oil containing groove, and the indium-plated oil groove inlet piston is further improved and is used for lubricating the engine with the piston pin;

an engine with a wedge-escape hole piston adopts a spark plug (35) which is provided with a protective welding skin (36) and wraps beside a discharge electrode (38) so as to be beneficial to the loss of the discharge electrode (38) and a receiving electrode (35); the component of the protective welding skin (36) contains titanium dioxide; the discharge electrode (38) adopts a section of curve of the logarithmic spiral approximately similar to the discharge part of the receiving electrode (35) so as to make the impact pressure tend to be balanced by utilizing the equal characteristic at the pressure angle of the logarithmic spiral as much as possible. An engine with a function connection spark plug adopts a spark plug (35) which is provided with a protective welding skin (36) and is wrapped beside a discharge electrode (38) so as to facilitate the loss of the discharge electrode (38) and a receiving electrode (35); the component of the protective welding skin (36) contains titanium dioxide; the discharge electrode (38) adopts a segment of a curve of a logarithmic spiral approximately similar to the discharge portion of the receiving electrode (35); a flexible metal grid (37) is arranged on a curve section of a discharging part of the receiving electrode (35); the flexible metal grid is woven by silk threads formed by winding platinum wires with molybdenum wires; a kind of function connects the spark plug and connects the junction with high-pressure union to have a kind of logarithmic connection hook head (39), it has function to connect arcuate outline, it is a section similar to logarithmic spiral approximately, in order to utilize logarithmic spiral pressure angle equal characteristic all over of position to make a kind of function connect spark plug and high-pressure union connect the bad contact problem of accidental firing through the said logarithmic connection hook head; a spark plug with movable grid electrode is provided with a movable electrode (40) with welding skin, which is movably arranged in a discharge area between the upper part of a flexible metal grid (37) of a receiving electrode (35) and the lower part of a discharge electrode (38) so as to form two discharge points above and below the movable electrode (40) with welding skin; the interior of each wedge is communicated with a cavity (41), and the space of the cavity is arranged between the piston surface of the engine piston (17) and the layer surface of the upper part of the piston pin hole of the piston pin placing end of the engine piston (17) to form a buffer gap and a noise reduction space; a cavity (41) communicated with the inside of each wedge of an engine with a wedge hole piston is arranged between the piston surface of the engine piston (17) and the upper layer surface of a piston pin hole at the piston pin end of the engine piston (17) to form a buffer gap and a noise reduction space; the wedges of an engine with a wedge escape hole piston are respectively provided with at least one escape hole (42) so as to be communicated with the through holes (32) and the oval inlet (34) through the interior of each wedge to form the cavity (41) for buffering and noise reduction.

The device has the advantages of energy conservation and emission reduction, and is beneficial to removing carbon deposit, reducing loss and forming two discharge points for better ignition; (ii) a The space of the cavity (41) communicated with the interior of each wedge is arranged between the piston surface of the engine piston (17) and the layer surface of the upper part of the piston pin hole of the piston pin end of the engine piston (17) to form a buffer gap and a noise reduction space.

Drawings

The invention is further illustrated with reference to the following figures and examples.

FIG. 1 is a schematic diagram of an automatic clamping and positioning mechanism for simultaneously mounting two G-shaped elastic pads at the pin end of a piston of a small engine.

Fig. 2 is a perspective view of the main body guide (15).

Fig. 3 is a schematic perspective view of the clamping cylinders (1, 1b) provided with the chute (2).

FIG. 4 is a schematic view of the side surface of the G-shaped elastic pad (7).

Fig. 5 is a perspective view of the main push rod (8).

FIG. 6 is a schematic side view of the piston pin (10).

FIG. 7 is a schematic view of an enlarged side surface of a piston pin (10) with fillets (11) and taper (12).

Figure 8 is a schematic perspective view of another angle of the clamping cylinder (1) provided with a chute (2).

Fig. 9 is a perspective view of the chuck (1b) provided with the inclined groove (2).

Figure 10 is a schematic view of the end faces of the clamping cylinders (1, 1b) provided with a chute (2).

Figure 11 is a schematic illustration of a top-down middle section of a chuck (1) provided with a chute (2).

Fig. 12 is a schematic diagram of a top-down middle section of the chuck cylinder (1b) provided with the inclined groove (2).

Fig. 13 is a perspective view of an anti-rotation stopper (13) provided with an anti-rotation groove (14).

Fig. 14 is a perspective view of another angle of the body guide (15).

Fig. 15 is a perspective view of the cylinder mount (16).

Fig. 16 is a cross-sectional view of a piston having a sink groove (18) at both ends for receiving a G-shaped elastic pad (7).

Fig. 17 is an assembly sectional view of the main follower push plate (20), the cylinder push plate (21), and the main follower pull block (22). Fig. 18 is a schematic view showing the assembly of a part of the piston (17) with the cylinder (26) and the auxiliary port (28).

FIG. 19 is a schematic view of an engine.

Fig. 20 is a schematic view of the assembly of a part of the piston (17) with the auxiliary air port (28).

Fig. 21 is a schematic view of a spark plug.

FIG. 22 is a schematic view of an oval noise reducing wedge.

Fig. 23 is a schematic view of a piston.

Fig. 24 is a schematic view of a spark plug.

FIG. 25 is a schematic view of a piston with a wedge-shaped escape aperture.

FIG. 26 is a schematic view of a wedge-shaped hole.

In the figure:

1. is a clamping cylinder on the left side which is symmetrical on the left and the right;

1b, a clamping cylinder is arranged on the left side and the right side which are symmetrical;

2. is a chute;

3. is an axial through hole of the clamping cylinder;

4. is a clamping table;

5. is an anti-rotation left platform;

6. is an anti-rotation right platform;

7. is a G-shaped elastic cushion;

8. is a main push rod (8);

9. is an anti-rotation platform (9) of the main push rod (8);

10. is a piston pin;

11. is a chamfer of the piston pin;

12. is the taper of the piston pin;

13. is an anti-rotation stopper (13);

14. is an anti-rotation slot;

15. is a main body guide seat;

16. is a cylinder mounting seat;

17. is a piston;

18. two sinking grooves of the piston are used for placing G-shaped elastic pads (7);

19. is a cylinder;

20. is a main follow-up push plate;

21. is a cylinder push plate;

22. is a main follow-up pull block;

23. is an auxiliary clamp seat;

24. is a stand;

25. a wave inlet;

26. a cylinder (26);

27. an engine;

28. an auxiliary air port (28);

29. outer noise reduction wedges (29);

30. a middle noise reduction wedge (30);

31. inner layer noise reduction wedges (31);

32. a through hole (32) is formed;

33. a wedge-shaped right section (33);

34. an elliptical inlet;

35. a spark plug (35);

36. a protective weld skin (36);

37. a flexible metal mesh (37);

38. a discharge electrode (38);

39. a logarithmic coupling hook (39);

40. a movable electrode (40) with a welding skin;

41. a cavity (41).

42. An escape aperture (42).

Detailed Description

The assembly of the piston and the crank connecting rod has great potential to be dug; only the following tooling is used.

Aiming at the current situation that the automatic production of simultaneously installing two G-shaped elastic cushions at the pin end of the piston of an engine is urgent, but the expensive full-automatic high-precision equipment is too high and enterprises are difficult to bear, the method for simultaneously installing two G-shaped elastic cushions at the pin end of the piston of a small engine is a method for simultaneously installing two G-shaped elastic cushions at the pin end of the piston of the small engine and solves the problem of great difficulty that the two G-shaped elastic cushions can not be simultaneously installed; the method is developed in practice for many years, is also a crystal of experience at home and abroad, and has the advantages of being beneficial to the auxiliary guidance of the piston to ensure the piston to be good; the assembly precision and the product quality are improved; the labor intensity is reduced; promote the popularization and the application of mass automatic feeding equipment and improve the production benefit.

Because only the inclined grooves are formed on the cylinder, the complicated mechanical hand containing a plurality of follow-up fingers is skillfully omitted to clamp the G-shaped elastic pad in an unfixed state in a deformation manner, and the device is simple, easy to operate, spectrum-dependent and easy to use; the core technology is the angle of the chute, namely the included angle between the chute (2) of the clamping cylinder (1, 1b) provided with the chute (2) and the axis of the clamping cylinder is seemingly simple, but is difficult to think out, and a great amount of practice is good; the angle is not proper and fails.

Because the automatic clamping and positioning mechanism for installing two G-shaped elastic pads at the piston pin end of a small engine simultaneously consists of clamping cylinders (1, 1b) provided with chutes (2), a main body guide seat (15), an anti-rotation stop block (13), a main push rod (8), a cylinder installation seat (16), a cylinder (19), a cylinder push plate (21), a main follow-up push plate (20), a main follow-up pull block (22), an auxiliary clamp seat (23) and a machine seat (24), the main body guide seat (15), the cylinder installation seat (16) and the cylinder (19) are symmetrically and sequentially arranged on the left side and the right side of the middle part of the machine seat respectively; a piston (17) provided with a crank connecting rod and a piston pin is arranged in the middle of the engine base, and an auxiliary clamp seat (23) of an auxiliary clamp is arranged on the upper part of the middle of the engine base; the method is characterized in that: the clamping cylinders (1, 1b) provided with the inclined grooves (2) are symmetrically arranged in the main body guide seat (15) at the left and right sides, and the inclined grooves (2) are used for placing G-shaped elastic pads; the main push rod (8) is movably inserted into the clamping cylinders (1, 1b) provided with the inclined grooves (2); the end parts of the main body guide seats (15) are respectively provided with the anti-rotation stop blocks (13); the rear part of the main push rod (8) is provided with the main follow-up push plate (20); the movable extension part of the cylinder (19) is connected with the cylinder push plate (21); the main follow-up pulling block (22) passes through the gap of the main follow-up pushing plate (20) and is connected with the cylinder pushing plate (21), so that the two cylinders are easy to realize the propelling and returning of the two cylinders under the conventional simple electric control of connecting two air passages in parallel.

The improved automatic clamping and positioning mechanism for simultaneously mounting two G-shaped elastic pads at the end of a piston pin of a small engine is characterized in that: the included angle between the inclined groove (2) of the clamping cylinder (1, 1b) provided with the inclined groove (2) and the axis of the clamping cylinder is more than 1 degree; an axial through hole (3) is arranged in the clamping cylinders (1, 1b) provided with the inclined grooves (2) so as to facilitate the main push rod (8) to pass through; the chute is a radial through hole and is only communicated with the upper cylinder wall but not communicated with the lower cylinder wall; the chute is a rectangle with two parallel sides in a top view; it is longer than 10mm and wider than 0.8mm to fit loosely into the G-shaped elastic pad. Because only the cylinder is provided with the inclined grooves, the complicated manipulator comprising a plurality of follow-up fingers is skillfully omitted for deformationally clamping the G-shaped elastic pad in an unfixed state, and the device is not only simple, but also easy to operate and easy to use. Failure without angle, because it has no radial component, cannot be installed.

The improved automatic clamping and positioning mechanism for simultaneously mounting two G-shaped elastic pads at the end of a piston pin of a small engine is characterized in that: the inclined groove (2) of the clamping cylinder (1, 1b) provided with the inclined groove (2) and the axis of the clamping cylinder form an included angle of 1-38.66 degrees. Since the outside diameter of the pads is 10mm and the inside diameter of the pin-receiving inlets of the wrist pin and piston is 8mm, the tangent angle ARCTAN (θ. 8/10) is 38.66 degrees if the two legs of the calculated right triangle are 8 and 10, respectively.

Further experiment is improved the automatic clamping positioning mechanism who installs two G type cushion simultaneously at small-size engine piston round pin end, characterized by: the clamping barrel with the inclined grooves (2) (1, 1b) is characterized in that the inclined grooves (2) and the axis of the clamping barrel form an included angle of 10-25 degrees, and the effect is good.

The improved automatic clamping and positioning mechanism for simultaneously mounting two G-shaped elastic pads at the end of a piston pin of a small engine is characterized in that: the clamping barrel with the inclined grooves (2) (1, 1b) is characterized in that the inclined grooves (2) and the axis of the clamping barrel form an included angle of 15-20 degrees, and the effect is better.

The improved automatic clamping and positioning mechanism for simultaneously mounting two G-shaped elastic pads at the end of a piston pin of a small engine is characterized in that: the clamping cylinder (1, 1b) provided with the chute (2) is characterized in that the included angle between the chute (2) and the axis of the clamping cylinder is 15.7-17.66 degrees, and the effect is remarkable.

The improved automatic clamping and positioning mechanism for simultaneously mounting two G-shaped elastic pads at the end of a piston pin of a small engine is characterized in that: the clamping cylinder (1, 1b) provided with the chute (2) is characterized in that the included angle between the chute (2) and the axis of the clamping cylinder is 16.7 degrees, and the effect is remarkable and good.

The improved automatic clamping and positioning mechanism for simultaneously mounting two G-shaped elastic pads at the end of a piston pin of a small engine is characterized in that: the main push rod (8) is provided with an anti-rotation platform (9) for limiting the rotation freedom.

The improved automatic clamping and positioning mechanism for simultaneously mounting two G-shaped elastic pads at the end of a piston pin of a small engine is characterized in that: the end part of the main body guide seat (15) is provided with an anti-rotation stop block (13) which is provided with an anti-rotation groove (14) so as to be matched with an anti-rotation left platform (5) and an anti-rotation right platform (6) which are arranged on the clamping cylinders (1, 1b) provided with the inclined grooves (2) to limit the rotation freedom degree.

Because the piston pin is inserted into the 8mm hole of the piston well, the chamfer angle of the piston pin and the oblique taper of the piston pin are provided, but the function is also provided, so that a gap is formed between the pin and the hole, the gap between the sinking groove and the piston pin end is added, the gap between the groove of the sinking groove and the non-circular elastic pad is added, the G-shaped elastic pad is manually placed, the deformation at two sides is different and actually askew, the piston pin is deflected by installing the elastic pads twice, one side is more and one side is less, one end of the piston pin is closer to the elastic pad sinking groove, and the balance of the rotational inertia and the energy conservation and emission reduction of the engine are influenced; the automatic clamping and positioning mechanism which is changed to be used for installing two G-shaped elastic pads at the end of a piston pin of a small engine at the same time is improved.

The over-constraint of directly screwing the main push rod by the extending part of the cylinder is failed, because the direct screwing of the extending parts of the two opposite cylinders to the main push rod and the sliding fit of other parts cannot be over-precise; the over-constraint is overcome only by using a follow-up push-pull mechanism consisting of a main follow-up push plate, a cylinder push plate and a main follow-up pull block, namely the main follow-up push plate (20) is arranged at the rear part of the main push rod (8); the movable extension part of the cylinder (19) is connected with the cylinder push plate (21); the main follow-up pulling block (22) passes through the gap of the main follow-up pushing plate (20) and is connected with the cylinder pushing plate (21), so that the push-pull mechanism is easy to use and performs reciprocating action.

An auxiliary clamp seat (23) of an auxiliary clamp is arranged at the upper part of the middle part of the machine seat, and the auxiliary clamp seat is provided with a conventional clamp which is not shown because of the conventional structure; a piston (17) provided with a crank connecting rod and a piston pin is arranged in the middle of the engine base, and the crank connecting rod and the piston pin are not shown in the figure but do not influence the implementation of reciprocating motion.

The clamping cylinders (1, 1b) provided with the inclined grooves (2) are symmetrically arranged in the main body guide seat (15) at the left and right sides, and the inclined grooves (2) are used for placing G-shaped elastic pads; the main push rod (8) is movably inserted into the clamping cylinders (1, 1b) provided with the inclined grooves (2); placing into G-shaped elastic pad, or manually or by automatic feeding equipment.

The invention has the advantages that: the automatic production of improving the engine piston pin end and simultaneously installing two G-shaped elastic cushions is very urgent, but the expensive full-automatic high-precision equipment is too expensive, so that the current situation that enterprises cannot bear the equipment is difficult; the method is a method for simultaneously installing two G-shaped elastic cushions at the pin end of a piston of a small-sized engine, and solves the problem that the simultaneous installation of two G-shaped elastic cushions cannot be realized; the method is developed in practice for many years, is also a crystal of experience at home and abroad, and has the advantages of being beneficial to the auxiliary guidance of the piston to ensure the piston to be good, being beneficial to the auxiliary action on mixed gas to reduce the discharge of hydrocarbon, and being beneficial to the auxiliary lubrication and heat dissipation; the assembly precision and the product quality are improved; the labor intensity is reduced; promote the popularization and the application of mass automatic feeding equipment and improve the production benefit.

The automatic clamping and positioning mechanism for simultaneously mounting the two G-shaped elastic pads at the pin end of the piston of the small-sized engine can be used for production, but has the outstanding problem of high rejection rate. Many engine pistons have worn out inlets at the pin end of the piston to render the engine piston unusable; many proposals have been tried and found to be unsatisfactory for a few years, but have been solved by an unexpected solution, namely that the inlet of the piston pin end of the engine piston is not chamfered by the usual chamfer of the bore, and the two G-shaped elastic pads are directly mounted, so that the rejection rate is zero, and the piston pin end of the engine piston is successfully used for several years. The reason may be that a certain part of the G-shaped elastic cushion with the opening is inclined when abutting against the chamfer (d18) of the upper pin hole, so that the piston is scrapped and the piston is good without the chamfer, but the chamfer (d18) of the pin hole on the drawing of the engine piston is removed, and people do not think before, even if the know-how that the chamfer cannot be performed is disclosed now and probably people are not comfortable, the inlet of the piston pin end of the engine piston does not need the chamfer of the commonly used hole, has holes without the chamfer, and the rejection rate is zero in years, so that the practical effect is unexpected. According to the regulations for machine manufacturing, it is not conceivable that a significant bore such as the entrance of a piston pin end of an engine piston that fits a crankpin, generally speaking, is not the usual chamfer of the bore. On the contrary, under the accidental condition that the chamfer is forgotten to be processed, the piston without the chamfer is placed into an automatic clamping and positioning mechanism which is provided with two G-shaped elastic pads at the same time at the pin end of the piston of the small-sized engine, the rejection rate is known to be zero, then the piston pin and the crank connecting rod are assembled, and the whole machine test and export are carried out for several years to confirm the finding; the inlet of the piston pin end of the engine piston is improved into a pin corrugation inlet without common chamfer angles of holes, and the effect is remarkable. If the work is required to be performed without chamfering, burrs are often left. The partial assembly of the piston (17) with the cylinder (26) and the auxiliary port (28) also requires auxiliary effects.

Bright spot:

an engine with a wedge cavity piston is provided with a movable mesh electrode spark plug which is provided with a welding skin movable electrode (40) which is movably arranged on a flexible metal grid (37) of a received electrode (35) and a discharge area between a discharge electrode (38) and the lower part of the movable mesh electrode, so that two discharge points are formed at the upper part and the lower part of the welding skin movable electrode (40). The spark plug (35) is provided with a protective welding skin (36) and is wrapped beside the discharge electrode (38) so as to be beneficial to the loss of the discharge electrode (38) and the receiving electrode (35); the component of the protective welding skin (36) contains titanium dioxide. When two G-shaped elastic pads are simultaneously installed at the piston pin end of a small engine, the common chamfer angle of the hole is not needed at the inlet of the piston pin end of the engine piston, the non-chamfer angle position of the hole is improved into a pin wave inlet, and then the pin wave inlet is improved into an indium-plated oil groove inlet piston, so that the effect is remarkable. Burrs are easy to remain when the processing is carried out due to the requirement of no chamfer; a logarithmic connection hook (39) is provided in the connection portion of a spark plug with functional connection and a high-voltage connector, and has an arc outline of functional connection, which is a section similar to a logarithmic spiral, so that the old and difficult problem of poor contact caused by accidental sparking is solved by utilizing the characteristic that the pressure angle of the logarithmic spiral is equal everywhere through the logarithmic connection hook.

An engine with a wedge cavity piston adopts a spark plug (35) which is provided with a protective welding skin (36) and covers a discharge electrode (38) so as to be beneficial to the loss of the discharge electrode (38) and a receiving electrode (35); the component of the protective welding skin (36) contains titanium dioxide; installing two G-shaped elastic pads at the piston pin end of a small engine simultaneously, which is characterized in that the inlet of a piston pin hole at the piston pin end of the engine piston (17) is improved into a wave inlet (25) without a chamfer angle of a common hole; the two G-shaped elastic cushions are arranged at the pin end of the piston of the small engine at the same time, so that the small engine is convenient to prevent the shell from being clamped and waste products are avoided; in order to further arrange noise reduction wedges, a plurality of noise reduction wedges are arranged on the piston surface of the engine piston (17), and the noise reduction wedges are sequentially arranged into an outer layer noise reduction wedge (29), a middle layer noise reduction wedge (30) and an inner layer noise reduction wedge (31) from three circles close to the circle center from the outside of an outer circle of the piston surface; the outer layer noise reduction wedges (29), the middle layer noise reduction wedges (30) and the inner layer noise reduction wedges (31) are arranged and combined in a plurality of arrays around the circular axis of the piston; the right section (33) of each wedge of the noise reduction wedges is in a trapezoid shape with a large bottom and a small upper part; the right section (33) of each wedge of the noise reduction wedges is in a trapezoid shape with a large bottom and a small upper part, and a through hole (32) is formed in the trapezoid shape; the outer layer noise reduction wedge (29), the middle layer noise reduction wedge (30) and the inner layer noise reduction wedge (31) are respectively provided with a through hole (32); the front section (33) of each wedge of the noise reduction wedges is in a shape of a trapezoid with a large bottom and a small upper part, and a cavity is arranged in each wedge with a through hole (32). When the noise airflow in the process of pressure-in explosion-exhaust rushes in from the through hole (32) formed on the trapezoid with a large bottom and a small upper part of the right section (33) of each wedge of the plurality of noise reduction wedges and the oval inlet (34) formed on the upper surface of each wedge of the plurality of noise reduction wedges, the noise airflow is compressed, when noise airflow in the process of pressure-entering and explosion-discharging rushes in through holes (32) formed in a trapezoid with a large bottom and a small upper part of the right section (33) of each wedge of the plurality of noise-reducing wedges, the noise airflow is compressed and then enters a cavity arranged in each wedge to be expanded, and then the expanded noise airflow is compressed again from the through hole (32) opened by each wedge of the plurality of noise reduction wedges, overflows to the outside and is expanded again, so that the noise reduction effect of the noise reduction wedges, which is compressed and expanded again and consumes the energy of the noise airflow, is achieved. The engine with braided two-wire electrode spark plug adopts a spark plug (35) which has a protective welding skin (36) and is wrapped beside a discharge electrode (38) so as to be beneficial to the loss of the discharge electrode (38) and a receiving electrode (35); the component of the protective welding skin (36) contains titanium dioxide. The piston surface is provided with a plurality of noise reduction wedges, and the noise reduction wedges are sequentially arranged into outer layer noise reduction wedges (29), middle layer noise reduction wedges (30) and inner layer noise reduction wedges (31) in three circles from the outside to the position close to the circle center; the right section (33) of each wedge of the noise reduction wedges is in a trapezoid shape with a large bottom and a small upper part, and a through hole (32) is formed in the trapezoid shape; the interior of each wedge is hollow. When noise airflow in the process of pressure-entering and explosion-exhausting is rushed in or extruded from a through hole (32) formed in a trapezoid with a large bottom and a small upper part and an oval inlet (34) of the right section (33) of each wedge of the noise-reducing wedges, the noise-reducing effect of the noise-reducing wedges, which is compressed and expanded again and then expanded, for consuming noise airflow energy is achieved.

PRO/ENGINEER WILDFIRE drawing software is adopted to newly set a work catalog, newly set parts and draft 2 concentric circles.

The variable cross-section scanning (Var search Sweep) command is turned on, and the above 2 circles are selected as the scanning track and the reference track.

Drawing a straight line parallel to the 2-circle plane, wherein the length L is (D-D)/2, and the straight line corresponds to the projection line of the circle edge.

Set-up PARAMETER (PARAMETER) 1: the real number (real number) of C can be assigned between 0.01 and 1, for example, 0.3, according to specific working conditions.

Set-up PARAMETER (PARAMETER) 2: the integer N, may be selected between 2 and 100, for example 13, depending on the particular operating condition. A relationship (relationship) is established, i.e. the sine wave equation of the present application is:

SDi＝C*SIN(TRAJPAR*360*N)；

in the above formula, i is a size number serial number; SIN ═ SINE, SINE function; TRAJPAR, trace function.

Then, the instructions of rotation, combination, materialization and the like are adopted.

It should be noted that other waveforms may be used, such as other mathematical functions or other somewhat rounded waveforms that are not sharp fold lines.

Firstly, manufacturing an electrode on tungsten copper by using a CNC machine tool, and then processing a waveform on a piston by using an electric spark machine tool; the piston pin hole of putting the piston pin end of engine piston (17) is downthehole, still establishes including the oil groove, including the oil groove is the wave form of import along the axial extension of hole, and the groove that forms is called including the oil groove, and further improvement is an indium-plated oil groove import piston again for the engine, do benefit to and the piston pin between lubricated.

An engine with wedge cavity piston, there are multiple noise reduction wedges on the piston surface, from outside to close to the centre of a circle, three circles of noise reduction wedges are arranged in order as the outer layer noise reduction wedge (29), the middle layer noise reduction wedge (30), the inner layer noise reduction wedge (31); through holes (32) are formed on the noise reduction wedges; the interior of each wedge is hollow. When noise airflow in the process of pressure-entering and explosion-exhausting is rushed in or extruded from a through hole (32) formed in a trapezoid with a large bottom and a small upper part and an oval inlet (34) of the right section (33) of each wedge of the noise-reducing wedges, the noise-reducing effect of the noise-reducing wedges, which is compressed and expanded again and then expanded, for consuming noise airflow energy is achieved. Firstly, the waveform parameter equation is processed into electrodes on tungsten copper by a CNC machine tool, and then the waveforms are processed on a piston by an electric spark machine tool. An oil containing groove is also arranged in the piston pin hole for placing the piston pin end, the oil containing groove is an oil containing groove formed by extending the wave-shaped inlet along the axial direction of the hole, and the oil containing groove is further improved into an indium-plated oil groove which is beneficial to the lubrication between the oil containing groove and the piston pin; a spark plug (35) used by an engine with a movable grid electrode spark plug is provided with a protective welding skin (36) which is wrapped beside a discharge electrode (38) so as to be beneficial to the loss of the discharge electrode (38) and a receiving electrode (35); the component of the protective welding skin (36) contains titanium dioxide; the discharge electrode (38) adopts a section of curve of a logarithmic spiral approximately similar to the discharge part of the receiving electrode (35) so as to make the impact pressure tend to be balanced by utilizing the equal characteristic at the pressure angle of the logarithmic spiral as much as possible. The curved section of the discharge part of the receiving electrode (35) is provided with a flexible metal grid (37); the flexible metal grid is woven by platinum wires and molybdenum wires.

The method has the advantages of saving energy, reducing emission, and being beneficial to removing carbon deposit, reducing loss and leading the impact pressure to tend to be balanced.

The invention has the beneficial effects and aims to save energy, reduce emission, and is beneficial to removing carbon deposit and reducing loss; the device is matched with a function wave combustion chamber to improve the efficiency, improve the working condition of the combustion chamber, obtain the effect of emission reduction reaching the standard, and can be selected by various machine types. However, the perfect invention pursued by human is endless, and the piston and scavenging gas have great potential to be dug. The so-called optimal geometry of the combustion chamber and the piston is of course important but has to be adapted to the engine model and to the ignition device in order to achieve a better result. Particularly, the fuel economy of the two-stroke gasoline engine is poorer than that of the four-stroke gasoline engine, and the emission of hydrocarbon in tail gas is always overproof; the matching of a combustion chamber and a piston of the internal combustion engine, an ignition device and scavenging is an old and difficult problem related to energy conservation and emission reduction. People know that the discharge of the secondary flushing machine exceeds the standard, but no people can thoroughly solve the problem; the iron shoes are broken without foraging, and are occasionally obtained after worrying, and are crystals of years of touch cables and experiences at home and abroad. Therefore, the brick is thrown to lead the jade; although the spark ignition process and the detailed physicochemical process are very complicated and still unknown in many respects, we probably can preliminarily think that although the mechanism of the atomic scale is to be explored in the future, the beneficial effect is self-evident, the service life of the electrode is prolonged and the de-coking is facilitated. The method is favorable for wedge collision and turbulence effect of mixed gas, the collision and the turbulence are also favorable for repelling carbon molecular flow, and the mixture with liquefaction tendency in the gap has not only the opportunity of electric arc discharge but also drum-shaped discharge similar to electric spark machining discharge, thereby improving the quality of spark discharge and having better working condition performance due to the comprehensive effect. The discharge electrode (38) adopts a section of curve of the logarithmic spiral approximately similar to the discharge part of the receiving electrode (35) so as to make the impact pressure tend to be balanced by utilizing the equal characteristic at the pressure angle of the logarithmic spiral as much as possible. An engine with a wedge cavity piston adopts a spark plug (35) which is provided with a protective welding skin (36) and covers a discharge electrode (38) so as to be beneficial to the loss of the discharge electrode (38) and a receiving electrode (35); the component of the protective welding skin (36) contains titanium dioxide; the discharge electrode (38) adopts a segment of a curve of a logarithmic spiral approximately similar to the discharge portion of the receiving electrode (35); a flexible metal grid (37) is arranged on a curve section of a discharging part of the receiving electrode (35); the flexible metal grid is woven by platinum wires and molybdenum wires.

An engine with a wedge cavity piston adopts a spark plug (35) which is provided with a protective welding skin (36) and covers a discharge electrode (38) so as to be beneficial to the loss of the discharge electrode (38) and a receiving electrode (35); the component of the protective welding skin (36) contains titanium dioxide. A plurality of noise reduction wedges are arranged on the piston surface, and through holes (32) are formed in the noise reduction wedges; the interior of each wedge is hollow. The wavy axial extension of the piston pin hole, which is provided with an inlet, is an oil-containing groove, and the oil-containing groove is further improved into an indium-plated oil groove which is beneficial to the lubrication between the piston pin hole and the indium-plated oil groove. The discharge electrode (38) adopts a section of curve of the logarithmic spiral approximately similar to the discharge part of the receiving electrode (35) so as to make the impact pressure tend to be balanced by utilizing the equal characteristic at the pressure angle of the logarithmic spiral as much as possible. The discharge electrode (38) adopts a segment of a curve of a logarithmic spiral approximately similar to the discharge portion of the receiving electrode (35); a flexible metal grid (37) is arranged on a curve section of a discharging part of the receiving electrode (35); the flexible metal grid is woven by wires formed by winding molybdenum wires with platinum wires, so that the discharge quality of the spark plug is improved although the cost is high. A spark plug with a movable mesh electrode is provided with a movable electrode (40) with a welding skin, which is movably arranged in a discharge area between a flexible metal grid (37) of a received electrode (35) and a discharge electrode (38) so as to form two discharge points above and below the movable electrode (40) with the welding skin; the cavities (41) are communicated with each other, and the space of the cavity is arranged between the piston surface of the engine piston (17) and the layer surface of the upper part of the piston pin hole of the piston pin placing end of the engine piston (17) to form a buffering gap and a noise reduction space. The connecting part of the spark plug and the high-voltage connector with the function connection is internally provided with a logarithmic connection hook head (39) which has an arc outline of the function connection and is a section similar to a logarithmic spiral approximately, so that the old and difficult problem of poor contact caused by accidental sparking in the connection of the spark plug and the high-voltage connector with the function connection can be solved by utilizing the characteristic that the pressure angle of the logarithmic spiral is equal everywhere through the logarithmic connection hook head. A cavity (41) communicated with the interior of each wedge of an engine with a wedge hole piston is arranged between the piston surface of the engine piston (17) and the upper layer surface of a piston pin hole at the piston pin end of the engine piston (17) to form a buffer gap and a noise reduction space; the wedges of an engine with a wedge escaping hole piston are respectively provided with at least one escaping hole (42) so as to be communicated with the through holes (32) and the oval inlet (34) through the inside of each wedge to form the cavity (41) for buffering and noise reduction.

A cavity (41) communicated with the interior of each wedge of an engine with a wedge hole piston is provided, and the space of the cavity is arranged between the piston surface of an engine piston (17) and the layer surface of the upper part of a piston pin hole at the piston pin end of the engine piston (17) to form a buffer gap and a noise reduction space; each wedge is provided with at least one escape hole (42) for communicating with the plurality of through holes (32) and the oval inlet (34) through the interior of each wedge to the cavity (41) for cushioning and noise reduction.

Claims

1. When two G-shaped elastic cushions are simultaneously installed at the piston pin end of a small engine, the engine with the wedge-shaped hole piston is characterized in that the inlet of a piston pin hole at the piston pin end of the engine piston (17) is not required to be chamfered by a common hole, and the non-chamfered part of the hole at the inlet of the piston pin hole is improved into a wave inlet (25); the noise reduction wedge structure is characterized in that a plurality of noise reduction wedges are arranged on the piston surface of the engine piston (17), and three circles of noise reduction wedges are sequentially arranged from the outer circle of the piston surface to the outside and are close to the circle center to form an outer noise reduction wedge (29), a middle noise reduction wedge (30) and an inner noise reduction wedge (31); the outer layer noise reduction wedges (29), the middle layer noise reduction wedges (30) and the inner layer noise reduction wedges (31) are arranged and combined in a plurality of arrays around the circular axis of the piston; the right section (33) of each wedge of the noise reduction wedges is in a trapezoid shape with a large bottom and a small upper part; the right section (33) of each wedge of the noise reduction wedges is in a trapezoid shape with a large bottom and a small upper part, and a through hole (32) is formed in the trapezoid shape; the outer layer noise reduction wedge (29), the middle layer noise reduction wedge (30) and the inner layer noise reduction wedge (31) are respectively provided with a through hole (32); the right section (33) of each wedge of the noise reduction wedges is a trapezoid with a large bottom and a small upper part, and the inside of each wedge is provided with a communication cavity (41) of a through hole (32); the upper surface of each wedge of each noise reduction wedge is also provided with an oval inlet (34); the wave shape of the wave inlet is prepared by the following steps:

set-up PARAMETER (PARAMETER) 1: c real number (real number), which can be assigned between 0.01 and 1 according to specific working conditions, and is taken as 0.3; set-up PARAMETER (PARAMETER) 2: n integer (integer), can follow the value of selecting between 2-100 according to the concrete working condition, choose 13; a relationship (relationship) is established, i.e. the sine wave equation of the present application is:

SDi＝C*SIN(TRAJPAR*360*N)

an oil containing groove is further formed in a piston pin hole of the piston pin end of the engine piston (17), the oil containing groove is a wave-shaped extension of an inlet along the axial direction of the hole, the formed groove is called as the oil containing groove, and the indium-plated oil groove inlet piston is further improved to be used for an engine so as to be beneficial to lubrication between the piston pin and the engine;

an engine with a wedge-escape hole piston adopts a spark plug (35) which is provided with a protective welding skin (36) and wraps beside a discharge electrode (38) so as to be beneficial to the loss of the discharge electrode (38) and a receiving electrode (35); the component of the protective welding skin (36) contains titanium dioxide; the discharge electrode (38) adopts a segment of a curve of a logarithmic spiral approximately similar to the discharge portion of the receiving electrode (35); a flexible metal grid (37) is arranged on a curve section of a discharging part of the receiving electrode (35); the flexible metal grid is woven by silk threads formed by winding platinum wires with molybdenum wires; a logarithmic connection hook head (39) is arranged in the connection part of the spark plug and the high-voltage connector, has an arc outline of function connection and is a section similar to a logarithmic spiral approximately, so that the old and difficult problem of poor contact caused by accidental mis-ignition can be solved by connecting the spark plug and the high-voltage connector through the logarithmic connection hook head by utilizing the equal characteristics of pressure angles of the logarithmic spiral; a spark plug with movable grid electrode is provided with a movable electrode (40) with welding skin, which is movably arranged in a discharge area between the upper part of a flexible metal grid (37) of a receiving electrode (35) and the lower part of a discharge electrode (38) so as to form two discharge points above and below the movable electrode (40) with welding skin; a cavity (41) communicated with the interior of each wedge of an engine with a wedge hole piston is arranged between the piston surface of the engine piston (17) and the upper layer surface of a piston pin hole at the piston pin placing end of the engine piston (17) to form a buffer gap and a noise reduction space; the wedges of an engine with a wedge escaping hole piston are respectively provided with at least one escaping hole (42) so as to be communicated with the through holes (32) and the oval inlet (34) through the inside of each wedge to form the cavity (41) for buffering and noise reduction.