CN214118286U - Pressure balance structure of two-cylinder engine - Google Patents

Abstract

The utility model provides a pressure balance structure of two jar engines belongs to motorcycle technical field. The two-cylinder engine solves the technical problem that the existing two-cylinder engine is large in power loss. The pressure balance structure of the two-cylinder engine comprises a cylinder body and a crankcase, wherein two cylinder barrels are arranged in the cylinder body side by side, a vertically arranged supporting wall is arranged in the crankcase, the supporting wall divides an inner cavity of the crankcase into two cavities, the two cavities are respectively opposite to and communicated with the two cylinder barrels above the two cylinder barrels, the pressure balance structure comprises lower vent holes located on the side surface of the supporting wall and/or upper vent holes located between the supporting wall and the cylinder body, and the upper vent holes and the lower vent holes can communicate the two cavities. The utility model discloses the pressure fluctuation between two cylinders of effective balance improves transmission efficiency and reduces machine oil consumption.

Description

Pressure balance structure of two-cylinder engine

Technical Field

The utility model belongs to the technical field of the engine, a pressure balance structure of two jar engines is related to.

Background

The engine of motorcycle is a machine which ignites the fuel mixture in the cylinder to burn and generate heat energy to be changed into mechanical energy, and the power is transmitted to the rear wheel of the motorcycle by a crankshaft through a transmission mechanism to be changed into the driving power of the vehicle.

The structure of an internal combustion engine is disclosed in chinese patent application publication No. CN105781673A, and the internal combustion engine includes a crankcase body provided with a crankcase chamber, a gear case body provided with a speed change gear set, and a cylinder block assembled on the crankcase body, a cylinder head assembled on the cylinder block and provided with a valve actuating chamber for installing a valve mechanism, the crankcase body and the gear case body are independent case bodies having respective outer walls, wherein the gear case body is provided with a blow-by gas passage, and a check valve for allowing only the crankcase body to flow oil gas toward the gear case body is provided on an exhalation port for communicating the crankcase body and the gear case body where the oil is not soaked.

According to the internal combustion engine structure, the expiration pore passage is arranged to release high-temperature oil gas pressure, so that the internal combustion engine structure is simplified, but when the piston moves up and down in work, the internal combustion engine can be acted by large air resistance in the crankcase, and power loss is caused. To improve the above problems, one of ordinary skill in the art can easily consider: 1. a pressure release valve and an air suction valve which are communicated with the outside are arranged on the side wall of the crankshaft cavity corresponding to the cylinder barrel; 2. the lubricating effect of the engine oil on the piston is improved so as to reduce the motion resistance.

Disclosure of Invention

The utility model discloses to the above-mentioned problem that prior art exists, provide a pressure balance structure of two jar engines, the utility model aims to solve the technical problem that: how to improve the working efficiency of the engine.

The purpose of the utility model can be realized by the following technical proposal:

the pressure balance structure of the two-cylinder engine comprises a cylinder body and a crankcase, wherein two cylinder barrels are arranged side by side in the cylinder body, a vertically arranged supporting wall is arranged in the crankcase, the supporting wall divides an inner cavity of the crankcase into two cavities, the two cavities are respectively opposite to and communicated with the two cylinder barrels above the crankcase, and the pressure balance structure is characterized by comprising a lower vent hole positioned on the side surface of the supporting wall and/or an upper vent hole positioned between the supporting wall and the cylinder body, and the upper vent hole and the lower vent hole can communicate the two cavities.

The cylinder barrel is used for being matched with the piston in the cylinder body, the piston reciprocates along the axial direction of the cylinder barrel when in stroke motion, the crank case is positioned below the cylinder body, the vertically arranged supporting wall arranged in the crank case can support a crank shaft which is rotationally connected with the piston connecting rod to enable the crank shaft to rotate stably, and can simultaneously provide a supporting effect for the cylinder body, the multiple cylinder barrels can improve the engine displacement and enable the engine to work more stably, the supporting wall divides an inner cavity of the crank case into two cavities and is right opposite to the cylinder barrel above, and therefore the supporting position of the supporting wall is right between the two cylinder bodies, and the uniform load can be guaranteed. Through setting up air vent under the side of supporting wall and/or set up the air vent between supporting wall and cylinder body, and make air vent and last air vent all with two cavity intercommunications down, like this when engine during operation, two pistons all are in different stroke state and position, the air in the extrusion below cavity forms the high pressure when the piston is down, and next door piston then can get into the state of going upward and extract the air in corresponding cavity and form the negative pressure, it is very little to make two cylinder sections form the pressure fluctuation jointly, air between positive pressure and the negative pressure cavity can satisfy whole pressure balance through an air vent quick switching, thereby reduce the resistance that the piston motion received, transmission efficiency is improved, in addition still avoid producing too high pressure fluctuation in the cavity and lead to the oil atomization and then invade piston cooperation department and influence combustion chamber oil-gas separation effect, machine oil consumption has also been reduced.

In the pressure balance structure of the two-cylinder engine, the engine further comprises a gear box, and the inner side wall of the crankcase is provided with an air expansion hole communicated with the gear box. Still be equipped with the gear box on the engine, the gear box is used for assembling speed change mechanism, through the inside wall setting at the crankcase and the gas diffusion hole that the gear box is linked together, crankcase and gear box intercommunication have increased the volume that piston motion leads to atmospheric pressure change like this, and the pressure change that produces in the crankcase when the piston goes upward or goes down can be shared better promptly, makes the pressure fluctuation littleer, further reduces piston motion resistance, guarantees the oil-gas separation effect and improves engine efficiency.

In the pressure balance structure of the two-cylinder engine, a top of the support wall has a notch, and the upper vent hole is formed between the notch and the cylinder block. Set up the breach through the top at the support wall, make and form the air vent between the lower extreme of breach and cylinder body, breach processing is more convenient, and the last air vent that forms between breach and the cylinder body is closer with the cylinder lower extreme distance, and the piston can carry out air exchange with adjacent cavity more high-efficiently when inhaleing or extruding the air, reduces to producing too big influence to the atmospheric pressure in the cavity of place, on the reduction pressure oscillation, improves engine efficiency.

In the pressure balance structure of the two-cylinder engine, the lower end of the cylinder barrel protrudes out of the lower surface of the cylinder body, and the lower end of the cylinder barrel is positioned in the notch and forms the upper vent hole with the notch. Through the lower surface that sets up the lower extreme protrusion cylinder body of cylinder, and make the lower extreme of cylinder be located the breach and with this breach between form the air vent, further make like this between the lower extreme of cylinder and the breach form the air vent, guarantee that this department goes up the air vent and directly exchanges to the air in the cylinder high-efficiently.

In the pressure balance structure of the two-cylinder engine, the lower vent holes are arranged on the side edge of the supporting wall, a plurality of air diffusion holes are arranged, at least one air diffusion hole is positioned at the joint of the inner side wall of the crankcase and the supporting wall and is communicated with the lower vent hole at the joint, and the air diffusion hole simultaneously communicates the cavities at two sides of the supporting wall. Through setting up air vent down at the side edge of supporting wall, set up the lower air vent joint intercommunication of gas diffusion hole and this department at the junction of crankcase inside wall and this side of supporting wall, the air pressure in the cavity produces when changing because of piston motion like this and can exchange through gas diffusion hole and lower air vent simultaneously, and the circulation sectional area between this department and gear box and the adjacent cavity is all bigger, does benefit to realize that the air exchanges fast and suitability ground, further guarantees the pressure balance effect.

In the pressure balance structure of the two-cylinder engine, the inner edge of the air diffusion hole and the inner edge of the lower vent hole are subjected to fillet transition treatment. The inner edges of the air expanding holes and the inner edges of the lower vent holes are subjected to fillet transition treatment, so that the air is ensured to have smaller and smoother resistance when flowing through the air expanding holes and the lower vent holes, and further the pressure balance is ensured and the engine efficiency is improved.

In the pressure balance structure of the two-cylinder engine, the crankcase comprises an upper box body and a lower box body which are fixedly connected, and the air expansion hole and the lower vent hole are both positioned at the joint of the upper box body and the lower box body. Through setting up the crankcase including the last box and the lower box that link firmly mutually, make gas diffusion hole and lower air vent all be located the junction of last box and lower box, do benefit to the components of a whole that can function independently processing fluting like this, can reduce the technology degree of difficulty, make the lower air vent and the gas diffusion hole of this department be located the meso position of crankcase height in addition, pressure balance effect can not receive the machine oil influence.

In the pressure balance structure of the two-cylinder engine, the plurality of air diffusion holes are arranged at intervals along the inner side wall of the crankcase, and each cavity is communicated with the gear box through at least one air diffusion hole. Through setting up a plurality of diffusion holes and arranging along the inside wall interval of crankcase to make every cavity communicate with the gear box through at least one diffusion hole, guarantee like this that each cavity and gear box air exchange are even relatively, do benefit to the pressure balance effect.

Compared with the prior art, the utility model has the advantages as follows:

this pressure balance structure of two jar engines sets up last air vent and lower air vent that communicates support wall both sides through the side at the support wall and between support wall and the cylinder body, makes the engine during operation, and air between malleation and the negative pressure cavity can be through last air vent and lower air vent quick exchange, reduces the resistance that the piston motion received, improves transmission efficiency, still avoids producing too high pressure fluctuation in the cavity in addition to lead to the machine oil atomizing and then invade the oil-gas separation effect that piston cooperation department influenced the combustion chamber.

Drawings

Fig. 1 is a schematic perspective view of the present embodiment.

Fig. 2 is an exploded structure diagram of the present embodiment.

Fig. 3 is a schematic perspective view of the crankcase and the gear case in the present embodiment.

Fig. 4 is an enlarged view of a portion a in fig. 3.

Fig. 5 is a schematic view of an exploded structure of the crankcase and the gear case in the present embodiment.

Fig. 6 is a schematic perspective view of the cylinder body and the upper tank body in the present embodiment.

Fig. 7 is an enlarged view of a portion B of fig. 6.

In the figure, 1, a cylinder body; 11. a cylinder barrel;

2. a crankcase; 21. a cavity; 22. an upper box body; 23. a lower box body;

3. a support wall; 31. a notch;

4. an upper vent; 5. a gear case; 6. expanding air holes; 7. a lower vent.

Detailed Description

The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

As shown in fig. 1-7, the pressure balance structure of the double-cylinder engine comprises a cylinder body 1 and a crankcase 2, a vertically arranged supporting wall 3 is arranged in the crankcase 2, two cylinder barrels 11 arranged side by side are arranged in the cylinder body 1, a lower vent hole 7 and an upper vent hole 4 which are communicated with cavities 21 at two sides of the supporting wall 3 are respectively arranged between the side surface of the supporting wall 3 and the cylinder body 1 and between the supporting wall 3 and the cylinder body 1, the supporting wall 3 divides an inner cavity of the crankcase 2 into two cavities 21 communicated through the upper vent hole 4 and the lower vent hole 7, and the two cavities 21 are respectively opposite to and communicated with the two cylinder barrels 11 above. Have in the cylinder body 1 with piston complex cylinder 11, the piston is along cylinder 11 axial reciprocating motion when stroke motion, and crankcase 2 is located cylinder body 1 below, sets up vertical arrangement's support wall 3 in the crankcase 2 and can provide the support to the bent axle of being connected with piston rod rotation and make its rotational stability, and can provide the supporting effect to cylinder body 1 simultaneously, sets up two cylinder 11 and can improve engine displacement and make engine work more stable. The lower vent hole 7 and the upper vent hole 4 which are communicated with the two sides of the supporting wall 3 are arranged between the side surface of the supporting wall 3 and the cylinder body 1, the supporting wall 3 divides the inner cavity of the crankcase 2 into two cavities 21 and is communicated with each other through the upper vent hole 4 and the lower vent hole 7, and simultaneously the cavities 21 are opposite to and communicated with the cylinder barrels 11 above one by one, so when the engine works, a plurality of two pistons are in different stroke states and positions, the air in the cavity 21 below is extruded to form high pressure when the piston descends, the piston of the next door can enter an ascending state to extract the air in the corresponding cavity 21 to form negative pressure, the pressure fluctuation of the plurality of cylinder barrels 11 is small, the air between the positive pressure cavity 21 and the negative pressure cavity 21 can be rapidly exchanged through the upper vent hole 4 and the lower vent hole 7 to meet the overall pressure balance, and the resistance on the movement of the piston is reduced, the transmission efficiency is improved, in addition, the phenomenon that engine oil is atomized and then invades the matching position of the piston to influence the oil-gas separation effect of the combustion chamber due to overhigh pressure fluctuation generated in the cavity 21 is avoided, and the engine oil consumption is also reduced. Further, the engine also comprises a gear box 5, and the inner side wall of the crankcase 2 is provided with an air diffusion hole 6 communicated with the gear box 5. Still be equipped with gear box 5 on the engine, gear box 5 is used for assembling speed change mechanism, through the inside wall setting at crankcase 2 with gear box 5 the gas diffusion hole 6 that is linked together, crankcase 2 and gear box 5 intercommunication have increased the volume that the piston motion leads to the atmospheric pressure change like this, the pressure change that produces in crankcase 2 when the piston goes upward or goes down can be shared better promptly, make the pressure fluctuation littleer, further reduce piston motion resistance, guarantee the oil-gas separation effect and improve engine efficiency. The side edge of the supporting wall 3 is also provided with a lower vent hole 7, the inner side wall of the crankcase 2 is vertical to the supporting wall 3 and is provided with an air expanding hole 6 communicated with the lower vent hole 7 at the joint, and the air expanding hole 6 simultaneously communicates the cavities 21 at the two sides of the supporting wall 3. Through setting up air vent 7 at the side edge of support wall 3 down, set up the air diffusion hole 6 and the lower air vent 7 joint intercommunication of this department at the junction of 2 inside walls of crankcase and 3 sides of support wall, the air can be exchanged through air diffusion hole 6 and lower air vent 7 simultaneously when the atmospheric pressure in cavity 21 produces the change because of the piston motion like this, the circulation sectional area between this cavity 21 and gear box 5 and adjacent cavity 21 is all bigger, do benefit to and realize that the air exchanges fast and suitability, further guarantee the pressure balance effect. Preferably, the inner edge of the gas diffusion hole 6 and the inner edge of the lower vent hole 7 are both subjected to fillet transition treatment. The inner edges of the air expanding holes 6 and the inner edges of the lower vent holes 7 are subjected to fillet transition treatment, so that the air is ensured to have smaller and smoother resistance when flowing through the air expanding holes 6 and the lower vent holes 7, and further, the pressure balance is ensured and the engine efficiency is improved. The air diffusion holes 6 are arranged at intervals along the inner side wall of the crankcase 2, and each cavity 21 is communicated with the gear box 5 through at least one air diffusion hole 6. There are a plurality of and along the inside wall interval arrangement of crankcase 2 through setting up gas diffusion hole 6 to make every cavity 21 communicate with gear box 5 through at least one gas diffusion hole 6, guarantee like this that each cavity 21 is relative even with the 5 air exchange of gear box, do benefit to the pressure balance effect.

As shown in fig. 5, the crankcase 2 includes an upper case 22 and a lower case 23 that are fixedly connected, and the gas diffusion hole 6 and the lower vent hole 7 are located at the joint of the upper case 22 and the lower case 23. Through setting up crankcase 2 including the last box 22 and the lower box 23 that link firmly mutually, make gas diffusion hole 6 and lower air vent 7 all be located the junction of last box 22 and lower box 23, do benefit to the components of a whole that can function independently processing fluting like this, can reduce the technology degree of difficulty, make the lower air vent 7 and the gas diffusion hole 6 of department be located the meso position of 2 heights of crankcase in addition, the balanced effect can not receive the machine oil influence.

As shown in fig. 2 to 7, the top of the support wall 3 has a notch 31, and an upper vent hole 4 is formed between the notch 31 and the cylinder 1. Through set up breach 31 at the top of supporting wall 3, make and form vent hole 4 between the lower extreme of breach 31 and cylinder body 1, breach 31 processing is more convenient, and the last vent hole 4 that forms between breach 31 and the cylinder body 1 is closer with 11 lower extremes of cylinder, and the piston can carry out air exchange with adjacent cavity 21 more high-efficiently when inhaleing or extruding the air, reduces the atmospheric pressure in the cavity 21 that is located and produces too big influence, on the reduction pressure fluctuation, improves engine efficiency. Further, the lower end of the cylinder 11 protrudes from the lower surface of the cylinder 1, and the lower end of the cylinder 11 is located in the notch 31 and forms an upper vent 4 with the notch 31. Through setting up the lower extreme protrusion cylinder body 1's of cylinder 11 lower surface, and make the lower extreme of cylinder 11 be located breach 31 and with form upper vent 4 between the breach 31, further make the lower extreme of cylinder 11 and form upper vent 4 between the breach 31 like this, guarantee to locate upper vent 4 and directly exchange the air in the cylinder 11 high-efficiently.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Claims (8)

1. The utility model provides a pressure balance structure of two jar engines, the engine includes cylinder body (1) and crankcase (2), cylinder (11) that have two and arrange side by side in cylinder body (1), support wall (3) that have vertical setting in crankcase (2), this support wall (3) are separated for two cavity (21) with the inner chamber of crankcase (2), two cavity (21) respectively with two of top cylinder (11) just communicate, its characterized in that, pressure balance structure is including being located support wall (3) side lower air vent (7) and/or being located last air vent (4) between support wall (3) and cylinder body (1), go up air vent (4) with air vent (7) homoenergetic down is with two cavity (21) intercommunication.

2. The pressure equalizing structure of a two-cylinder engine according to claim 1, characterized in that the engine further comprises a gear case (5), and the inner side wall of the crankcase (2) has an air-diffusing hole (6) communicating with the gear case (5).

3. The pressure equalizing structure of a two-cylinder engine according to claim 1 or 2, characterized in that the top of the support wall (3) has a notch (31), the notch (31) and the cylinder block (1) forming the upper vent hole (4) therebetween.

4. A pressure equalizing structure of a two-cylinder engine according to claim 3, characterized in that the lower end of the cylinder tube (11) protrudes from the lower surface of the cylinder block (1), and the lower end of the cylinder tube (11) is located in the notch (31) and forms the upper vent hole (4) with the notch (31).

5. The pressure equalizing structure of a two-cylinder engine according to claim 2, characterized in that the side edges of the supporting wall (3) are provided with the lower vent holes (7), the gas diffusion holes (6) are provided in a plurality, at least one gas diffusion hole (6) is provided at the joint of the inner side wall of the crankcase (2) and the supporting wall (3) and is communicated with the lower vent hole (7) at the joint, and the gas diffusion hole (6) simultaneously communicates the cavities (21) at both sides of the supporting wall (3).

6. The pressure equalizing structure of a two-cylinder engine according to claim 2, characterized in that both the inner edge of the blowhole (6) and the inner edge of the lower breather hole (7) are rounded.

7. The pressure balance structure of a two-cylinder engine according to claim 2 or 5, wherein the crankcase (2) comprises an upper case (22) and a lower case (23) which are fixedly connected, and the gas diffusion hole (6) and the lower vent hole (7) are both located at the joint of the upper case (22) and the lower case (23).

8. A pressure equalizing structure of a two-cylinder engine according to claim 2 or 5, characterized in that a plurality of said air-diffusing holes (6) are arranged at intervals along the inner side wall of the crankcase (2), and each of said cavities (21) communicates with said gear case (5) through at least one of said air-diffusing holes (6).

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