CN210599209U

CN210599209U - Gasoline engine box and gasoline engine thereof

Info

Publication number: CN210599209U
Application number: CN201921388932.2U
Authority: CN
Inventors: 李帅
Original assignee: Shandong Langsen Machinery Co Ltd
Current assignee: Shandong Langsen Machinery Co Ltd
Priority date: 2019-08-23
Filing date: 2019-08-23
Publication date: 2020-05-22
Anticipated expiration: 2029-08-23

Abstract

The utility model discloses a gasoline engine box and gasoline engine thereof, it belongs to gasoline engine technical field. The engine mainly comprises a gasoline engine box body and a closed cylinder, wherein the gasoline engine box body comprises a front half crankcase and a rear half crankcase which are matched with each other, crank cavities are arranged in the front half crankcase and the rear half crankcase, and a bearing hole, an oil seal hole and a fully-closed scavenging channel are respectively arranged on the front half crankcase and the rear half crankcase; and more than one flow limiting hole communicated with the fully-closed scavenging passage is respectively arranged on the side walls of the oil seal holes of the front half crankcase and the rear half crankcase. The utility model discloses realize the secondary acceleration rate of gas mixture, improved scavenging efficiency greatly, promoted the fuel atomization rate, when reducing gasoline engine fuel consumption greatly reduced in the tail gas harmful components's such as HC and CO content. The utility model discloses the supporting power of machines such as mainly used engineering, gardens.

Description

Gasoline engine box and gasoline engine thereof

Technical Field

The utility model belongs to the technical field of the gasoline engine, specifically speaking especially relates to a gasoline engine box and gasoline engine thereof.

Background

An open scavenging channel is usually arranged on a traditional gasoline engine box body, the original emission of the gasoline engine is higher, and in order to meet the emission requirements of Europe fifth, EPA and the like, a higher content of noble metal catalyst is required to be added into a silencer, so that the final product can meet the emission requirements. The catalyst has high content of noble metal, which causes higher design cost, and the gasoline engine has the problem of overhigh temperature of the cylinder body of the cylinder, thereby having fatal defects of cylinder pulling and the like of the gasoline engine; some manufacturers increase a throttle channel design at the joint of a crankcase and an air cylinder in order to reduce the original emission of the gasoline engine, for example, in the prior patent CN200810179520, although the original emission of the gasoline engine is reduced to a certain extent, the throttle hole is located at the joint of the air cylinder and the crankcase, the throttling and accelerating effect of mixed air in the crank chamber is not good, and in order to protect the scavenging effect, an end cover closed type scavenging channel structure needs to be added to the side surface of the cylinder body, the cylinder structure is complex, the end cover assembling process is complex, the problem of air leakage of the joint of the end cover and the air cylinder often occurs in the assembling process, and multiple times of disassembly and assembly and repair are needed, so that the structure has high requirements on.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is: the defects of the prior art are overcome, and the gasoline engine box and the gasoline engine thereof are provided, so that secondary speed increasing of mixed gas is realized, scavenging efficiency is greatly improved, fuel atomization rate is promoted, fuel consumption of the gasoline engine is reduced, and contents of harmful components such as HC and CO in tail gas are greatly reduced.

The gasoline engine box body comprises a front half crankcase and a rear half crankcase which are matched, crankshaft cavities are arranged in the front half crankcase and the rear half crankcase, and a bearing hole, an oil seal hole and a full-closed scavenging channel are respectively arranged on the front half crankcase and the rear half crankcase; and more than one flow limiting hole communicated with the fully-closed scavenging passage is respectively arranged on the side walls of the oil seal holes of the front half crankcase and the rear half crankcase.

Preferably, the fully closed scavenging passage comprises a first scavenging passage and a second scavenging passage, and a partition wall is arranged between the first scavenging passage and the second scavenging passage.

Preferably, the flow restriction orifice is a circular orifice.

Preferably, a retaining wall is arranged between the two adjacent limiting holes, and the width of the retaining wall is 1-5 mm.

Preferably, a bearing and an oil seal are respectively arranged in the bearing hole and the oil seal hole of the front half crankcase and the rear half crankcase, and the bearing adopts a deep groove ball bearing without covers on two sides.

Preferably, a bearing clearance is arranged in the bearing, an air guide channel communicated with the flow limiting hole is arranged on the side wall of the oil seal hole, and the bearing clearance is communicated with the flow limiting hole through the air guide channel.

The gasoline engine comprises the gasoline engine box body and the closed cylinder, the closed cylinder is connected with the top of the gasoline engine box body in a sealing mode, a crankshaft connecting rod assembly is arranged in the gasoline engine box body, a piston is arranged on the crankshaft connecting rod assembly, the piston is matched with the closed cylinder, and scavenging passages communicated with the full-closed scavenging passages are arranged on two sides in the closed cylinder.

Compared with the prior art, the beneficial effects of the utility model are that:

1. the utility model, through the cooperation of the totally-closed scavenging channel, the flow-limiting hole and the bearing clearance, leads the mixed gas to be pressurized and accelerated for one time under the action of the bearing clearance when entering the flow-limiting hole of the crankcase through the bearing clearance under the action of the high-speed rotation of the bearing;

2. the utility model discloses add the restricted aperture in the oil blanket hole lateral wall department of half preceding crankcase and latter half crankcase, simultaneously, adopt full-closed scavenging passage in the crankcase, under the prerequisite that does not change the cylinder structure, through the high-speed rotation of bearing, make the gas mixture after accelerating pass through the restricted aperture fast, because the gas flow path diminishes in the twinkling of an eye and makes pressure differential grow in the twinkling of an eye, realize the pressure boost and the acceleration of gas mixture, improve scavenging rate greatly, promoted fuel atomization, make the fuel burning more abundant, thereby reduce the content of harmful components such as HC and CO in fuel consumption rate and the tail gas;

3. the utility model discloses a spare part manufacturing procedure is simple, convenient assembling, and the application and promotion of being convenient for, HC + NOx emission has reduced about 15-20% than traditional gasoline engine, and the fuel consumption rate has reduced 5-10% than traditional gasoline engine, and the economic nature improves greatly, more energy-concerving and environment-protective.

Drawings

FIG. 1 is a front view of a gasoline engine tank;

FIG. 2 is a sectional view taken along line A-A of FIG. 1;

FIG. 3 is a schematic view of the structure of FIG. 1 along the line B-B;

FIG. 4 is a schematic view of the structure of FIG. 1 in the direction of C-C;

FIG. 5 is a schematic structural diagram of a gasoline engine;

FIG. 6 is a schematic view of the structure of FIG. 5 taken along direction D-D;

FIG. 7 is a scavenging schematic diagram of a gasoline engine;

FIG. 8 is a sectional view taken along line E-E of FIG. 7;

FIG. 9 is a graph comparing the fuel consumption rate of the present invention with that of the prior art;

fig. 10 is a graph comparing HC + NOx emissions from the present invention with those from the prior art.

In the figure, 1, the front half-crankcase; 2. a rear half crankcase; 3. a crankshaft cavity; 4. a first scavenging channel; 5. a flow restriction orifice; 6. a second scavenging passage; 7. a partition wall; 8. retaining walls; 9. a bearing bore; 10. sealing the oil hole; 11. an air guide channel; 12. a closed cylinder; 13. a crankshaft connecting rod assembly; 14. an exhaust port; 15. a piston; 16. an air inlet; 17. fresh mixed gas; 18. a scavenging path; 19. Exhaust gases in the combustion chamber; 20. post combustion exhaust gases; 21. a scavenging outlet; 22. oil sealing; 23. and a bearing.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings:

the first embodiment is as follows: as shown in fig. 1 and fig. 2, a gasoline engine case comprises a front half crankcase 1 and a rear half crankcase 2 which are matched, a crankshaft cavity 3 is arranged in the front half crankcase 1 and the rear half crankcase 2, a bearing hole 9, an oil seal hole 10 and a fully-closed scavenging passage are respectively arranged on the front half crankcase 1 and the rear half crankcase 2, a bearing 23 and an oil seal 22 are respectively arranged in the bearing hole 9 and the oil seal hole 10, the bearing 23 adopts a deep groove ball bearing without covers at two sides, a plurality of flow limiting holes 5 communicated with the fully-closed scavenging passage are respectively arranged on the side walls of the two oil seal holes 10, in the embodiment, three flow limiting holes 5 are arranged on the side wall of each oil seal hole 10, a retaining wall 8 is arranged between two adjacent flow limiting holes 5, and the width dimension of the retaining wall 8 is 1; the flow restriction orifice 5 is preferably a circular orifice. The bearing 23 is internally provided with a bearing clearance, the side wall of the oil seal hole 10 is provided with an air guide channel 11 communicated with the flow limiting hole 5, and the bearing clearance is communicated with the flow limiting hole 5 through the air guide channel 11.

As shown in fig. 3 and 4, the fully closed scavenging passage includes a first scavenging passage 4 and a second scavenging passage 6, and a partition wall 7 is provided between the first scavenging passage 4 and the second scavenging passage 6.

Example two: as shown in fig. 5, the gasoline engine includes a gasoline engine case body and a closed cylinder 12 according to the first embodiment, the closed cylinder 12 is hermetically connected with the top of the gasoline engine case body, a combustion chamber is arranged in the closed cylinder 12, the combustion chamber is communicated with a crank cavity 3, a crank connecting rod assembly 13 is arranged in the crank cavity 3 of the gasoline engine case body, a piston 15 is arranged on the crank connecting rod assembly 13, the piston 15 is matched with the combustion chamber of the closed cylinder 12, and scavenging passages 18 communicated with a full-closed scavenging passage are arranged on two sides in the closed cylinder 12.

The working principle of the utility model is as follows:

when the closed cylinder 12 is used, the crankshaft connecting rod assembly 13 rotates around the axis of the bearing 23 at a high speed, and the crankshaft connecting rod assembly 13 drives the piston 15 to reciprocate up and down along the axial direction of the closed cylinder 12.

As shown in fig. 6, when the piston 15 moves upward to open the intake port 16 of the closed cylinder 12, and the exhaust port 14 and the scavenging outlet 21 are in a closed state, the fresh air-fuel mixture 17 enters the crank chamber 3 of the closed space formed by the front half crankcase 1 and the rear half crankcase 2 through the intake port 16 of the closed cylinder 12 and is stored;

as shown in fig. 7, when the piston 15 descends until the exhaust port 14 is opened, the burned exhaust gas 20 in the closed cylinder 12 is discharged outside through the exhaust port 14;

as shown in fig. 7 and 8, when the piston 15 continues to move downwards, the pre-compressed fresh air mixture 17 stored in the crank chamber 3 enters the air guide channel 11 after being subjected to primary flow limiting and pressurization acceleration through the bearing play of the high-speed rotating bearing 23, and is subjected to secondary pressure increasing, speed increasing and flow limiting when passing through the flow limiting holes 5 on the front half crankcase 1 and the rear half crankcase 2, the fresh air mixture 17 after secondary flow limiting and speed increasing enters the scavenging channel 18 of the closed cylinder 12 through the scavenging channel one 4 and the scavenging channel two 6 on the front half crankcase 1 and the rear half crankcase 2, and after the scavenging channel 18 is opened, the high-speed fresh air mixture 17 is quickly swept into the closed cylinder 12 to quickly sweep out the exhaust gas 19 and the burned exhaust gas 20 in the combustion chamber and is discharged through the exhaust port 14.

According to the survey, the utility model relates to a 42.7cc gasoline engine and prior art among the same discharge capacity gasoline engine respectively 10, under the operating mode of demarcation, the throttle is wide open promptly, and the throttle is wide open, tests under 7000r/min, and the result is shown in figure 9 and figure 10.

As can be seen from the figure, the emission value of HC + NOx shows that compared with the gasoline engine in the prior art, the gasoline engine of the utility model reduces about 15-20%; the fuel consumption rate shows, the utility model discloses compare than prior art fuel consumption rate, reduced about 5-10%, the utility model discloses have fine economic nature and application spreading value, through 17 secondary current-limiting, acceleration rates to fresh mixed gas, promoted the fuel atomization, make the fuel burning more abundant, more energy-concerving and environment-protective, reduced the use cost of gasoline engine.

Claims

1. A gasoline engine box body comprises a front half crankcase (1) and a rear half crankcase (2) which are matched, wherein a crankshaft cavity (3) is arranged in the front half crankcase (1) and the rear half crankcase (2); the method is characterized in that: be equipped with bearing hole (9), oil blanket hole (10) and full cut-off formula scavenging passage on preceding semi-crankcase (1) and the latter half crankcase (2) respectively, be equipped with restriction orifice (5) more than one and full cut-off formula scavenging passage intercommunication on the oil blanket hole (10) lateral wall of preceding semi-crankcase (1) and latter half crankcase (2) respectively.

2. The gasoline engine tank body of claim 1, wherein: the fully-closed scavenging passage comprises a scavenging passage I (4) and a scavenging passage II (6), and a partition wall (7) is arranged between the scavenging passage I (4) and the scavenging passage II (6).

3. The gasoline engine tank body of claim 1, wherein: the flow limiting hole (5) is a round hole.

4. The gasoline engine tank of claim 3, wherein: and a retaining wall (8) is arranged between every two adjacent limiting holes (5), and the width of the retaining wall (8) is 1-5 mm.

5. The gasoline engine tank body of claim 1, wherein: and a bearing (23) and an oil seal (22) are respectively arranged in a bearing hole (9) and an oil seal hole (10) of the front half crankcase (1) and the rear half crankcase (2), and the bearing (23) adopts a deep groove ball bearing without covers on two sides.

6. The gasoline engine tank of claim 5, wherein: the bearing is characterized in that a bearing clearance is arranged in the bearing (23), an air guide channel (11) communicated with the flow limiting hole (5) is arranged on the side wall of the oil seal hole (10), and the bearing clearance is communicated with the flow limiting hole (5) through the air guide channel (11).

7. A gasoline engine, comprising the gasoline engine box body and the enclosed cylinder (12) according to any one of claims 1 to 6, wherein the enclosed cylinder (12) is hermetically connected with the top of the gasoline engine box body, a crankshaft connecting rod assembly (13) is arranged in the gasoline engine box body, a piston (15) is arranged on the crankshaft connecting rod assembly (13), the piston (15) is matched with the enclosed cylinder (12), and scavenging passages (18) communicated with the fully-closed scavenging passages are arranged on two sides in the enclosed cylinder (12).