CN217632614U

CN217632614U - Ventilation structure of crankcase

Info

Publication number: CN217632614U
Application number: CN202222060833.XU
Authority: CN
Inventors: 莫康鑫; 潘江伟; 陈琦; 王清; 张立成
Original assignee: Zhejiang Qianjiang Motorcycle Co Ltd
Current assignee: Zhejiang Qianjiang Motorcycle Co Ltd
Priority date: 2022-08-02
Filing date: 2022-08-02
Publication date: 2022-10-21
Anticipated expiration: 2032-08-02

Abstract

The utility model provides a ventilation structure of crankcase belongs to engine technical field. The ventilation structure solves the technical problem that when an engine normally works, engine oil which is driven by airflow and contains impurities flows back to the bottom shell through the one-way valve to affect the quality of circulating engine oil. Among this ventilation structure of crankcase, the crankcase includes bent axle room and breather chamber, and ventilation structure includes only enables the one-way valve piece of the indoor air inflow breather chamber of bent axle, the backward flow recess has on the inside wall of breather chamber, the inner chamber of backward flow recess with bent axle room intercommunication, the one-way valve piece upper and lower direction set up can with the uncovered of backward flow recess is sealed, and the upper end of this one-way valve piece is the free end, the lower extreme of one-way valve piece links firmly on the uncovered terminal surface of backward flow recess. The ventilation structure of the crankcase ensures the engine oil circulation quality under the condition of realizing stable pressure of the crankshaft chamber.

Description

Ventilation structure of crankcase

Technical Field

The utility model belongs to the technical field of the engine, a ventilation structure of crankcase is related to.

Background

During operation of the engine, high-pressure combustible mixture and burned gas in the combustion chamber leak into the crankcase through a gap between the piston group and the cylinder to a greater or lesser extent, resulting in blow-by. The blow-by gas is composed of unburned fuel gas, water vapor, exhaust gas and the like, which can dilute the engine oil, reduce the service performance of the engine oil and accelerate the oxidation and deterioration of the engine oil. The water and the air are condensed in the engine oil to form oil sludge and block an oil way; acid gases in the exhaust gas are mixed into the lubrication system, which can cause corrosion and accelerated wear of engine parts; blow-by also causes the crankcase pressure to be too high and the crankcase seal to be broken, allowing oil to leak and run off. Crankcase ventilation must be implemented to prevent excessive crankcase pressure, extend engine oil life, reduce wear and corrosion of parts, and prevent engine oil leakage.

Patent application publication No. CN102042055a discloses an engine equipped with a breather mechanism. The ventilation mechanism includes: a breather passage to the crankcase; a breather chamber in communication with the crankcase via the breather passage; and a breather valve that is provided in the breather chamber and that is openable once the internal pressure of the crankcase exceeds a predetermined value to enable blow-by gas to flow from the crankcase into the breather chamber.

Above-mentioned structure can realize the ventilation effect of crankcase, nevertheless when the engine normal operating, is driven and the machine oil that contains impurity can flow back the drain pan through the check valve by the air current, influences the quality of circulating machine oil.

Disclosure of Invention

The utility model discloses to the above-mentioned problem that prior art exists, provide a ventilation structure of crankcase, the utility model aims to solve the technical problem that: the air pressure is stable, and the engine oil quality is ensured.

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

the utility model provides a ventilation structure of crankcase, crankcase include crank chamber and breather chamber, and ventilation structure includes only enables the one-way valve block of the indoor air inflow breather chamber of crank, its characterized in that, the backward flow recess has on the inside wall of breather chamber, the inner chamber of backward flow recess with crank chamber intercommunication, the one-way valve block upper and lower direction set up can with the uncovered of backward flow recess is sealed, and the upper end of this one-way valve block is the free end, the lower extreme of one-way valve block links firmly on the uncovered terminal surface of backward flow recess.

The crankshaft chamber is a cavity for accommodating the crankshaft body and the connecting rod part, the vent chamber is arranged adjacent to the crankshaft chamber and used for increasing the air pressure in the crankshaft chamber to exhaust gas for diversion utilization, the crankshaft chamber is communicated with the vent chamber to realize smooth flow of air pressure relief, and the one-way valve plate ensures the sealing property of the internal environment of the crankshaft chamber; the backflow groove is formed in the inner side wall of the breather chamber, the opening of the backflow groove is sealed by the one-way valve plate arranged in the vertical direction, the free end of the one-way valve plate is located at the upper end, the lower end of the one-way valve plate is fixedly connected to the opening end face of the backflow groove, so that pressurized air in a crankcase can jack the upper end of the one-way valve plate, oil mist condensed on the one-way valve plate from bottom to top can slide to the lower end of the backflow groove and is collected and slowly backflow under the constraint of the one-way valve plate, the one-way valve plate can be a metal elastic sheet or a rubber valve plate and the like, meanwhile, metal scraps and other impurities generated during engine grinding can be collected to the one-way valve plate when discharged along with pressurized gas, and then are deposited to the lower end of the backflow groove along with engine oil, mechanical damage caused by inflow of lubricating oil is avoided, meanwhile, the backflow groove can be conveniently cleaned after the one-way valve plate is detached during maintenance, and the circulation quality of the engine oil chamber is guaranteed under the condition that the pressure of the crankshaft chamber is stable.

In the ventilation structure of the crankcase, the bottom surface of the inner cavity of the backflow groove is provided with a deposition groove extending to the one-way valve plate. Increase the scaling degree of depth like this, further guarantee that metal fillings and other impurity can deposit in the sedimentation tank, make the scaling concentrate and can not oil backward flow at random, guarantee to maintain convenience and machine oil circulation quality.

In the ventilation structure of the crankcase, the inner wall of the backflow groove is provided with a through hole communicated with the crankcase from bottom to top, and the through hole is arranged opposite to the deposition groove below the through hole. Like this from the bent axle room oil mist gas that flows into the backward flow recess can be earlier downward with contact deposit groove department refrigerated machine fluid, and cooling is in advance, gets into backward flow recess upflow again and with one-way valve block and backward flow recess inner wall long stroke contact, further condensation backward flow, promotion backward flow and deposit effect.

In the ventilation structure of above-mentioned crankcase, the uncovered department of backward flow recess is connected with pressure baffle, the check valve piece centre gripping in pressure baffle with between the uncovered terminal surface of backward flow recess, this pressure baffle is the bar and the upper end of pressure baffle is towards the one side bending of keeping away from the check valve piece. Therefore, the pressure baffle can effectively restrict the deformation range of the one-way valve block, avoids the tilting deformation of other positions of the one-way valve block, and ensures stable pressure relief and stable impurity deposition effect.

In the ventilation structure of the crankcase, the bottom surface of the settling tank is inclined towards one side of the one-way valve plate. Therefore, impurities deposited in the depositing tank can be gathered at one side close to the one-way valve plate, the impurities can be prevented from flowing out of the groove along with oil when the engine oil overflows the groove, and the depositing effect is guaranteed.

In the ventilation structure of the crankcase, the pressure baffle is fixedly connected with the open end face of the backflow groove through bolts arranged around the circumference of the pressure baffle. Therefore, the fixing points of the one-way valve plate are arranged around the circumferential direction, and the sealing effect of the one-way valve plate is improved.

In the ventilation structure of the crankcase, the pressure baffle is provided with a plurality of abdicating through holes. The probability of leakage of the check valve plate caused by insufficient flatness of the pressure baffle is reduced, and the sealing effect of the check valve plate is guaranteed.

In the ventilation structure of the crankcase, the inner side wall of the ventilation chamber is provided with a convex ring, the inner cavity of the convex ring forms the backflow groove, and the one-way valve plate is fixedly arranged on the convex ring. Thus, the heat exchange efficiency of the oil mist in the backflow groove and the relatively cold air in the ventilation chamber is improved, and the condensation speed is further promoted.

In the ventilation structure of the crankcase, the crankcase is provided with a combustion cylinder and a balance cylinder, and the backflow groove is located below the balance cylinder. The backflow groove is arranged under the balance cylinder body which does not participate in combustion temperature rise, so that the environmental temperature in the channel is favorably reduced, and the condensation effect is improved.

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

the pressurized air in the crankcase can jack up the upper end of the one-way valve block in the ventilation structure of the crankcase, oil mist condensed on the one-way valve block can slide to the lower end of the backflow groove and slowly flow back along with the lifting of the liquid level, meanwhile, metal chips and other impurities generated during the grinding of the engine can be adhered to the one-way valve block when being discharged along with the pressurized air, then along with the deposition of engine oil to the lower end of the backflow groove, the phenomenon that the engine oil flows into the lubrication oil way to cause mechanical damage is avoided, meanwhile, the groove can be conveniently cleaned after the one-way valve block is detached during maintenance, and the circulation quality of the engine oil is guaranteed under the condition that the pressure of the crankshaft chamber is stable.

Drawings

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

Fig. 2 is a schematic cross-sectional structure diagram of the present embodiment.

Fig. 3 is an enlarged view of a portion a in fig. 2.

Fig. 4 is a schematic diagram of a three-dimensional explosion structure of the hidden part structure of the embodiment.

Fig. 5 is an enlarged view of a portion B in fig. 4.

In the figure, 1, crank chamber; 2. a breather chamber;

3. a backflow groove; 31. a deposition tank; 32. a port;

4. a one-way valve plate;

5. a pressure baffle; 51. a through hole;

6. a bolt; 7. a convex ring; 8. a combustion cylinder; 9. and a balance cylinder body.

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. 1-5, in the ventilation structure of the crankcase, the crankcase includes a crankshaft chamber 1 and a breather chamber 2, the crankshaft chamber 1 is communicated with the breather chamber 2, the ventilation structure includes a check valve plate 4 only enabling air in the crankshaft chamber 1 to flow into the breather chamber 2, a backflow groove 3 is arranged on the inner side wall of the breather chamber 2, an inner cavity of the backflow groove 3 is communicated with the crankshaft chamber 1, the check valve plate 4 is arranged in the up-down direction and can seal an opening of the backflow groove 3, the upper end of the check valve plate 4 is a free end, and the lower end of the check valve plate 4 is fixedly connected to an opening end surface of the backflow groove 3. The crankshaft chamber 1 is a cavity for accommodating a crankshaft body and a connecting rod part, the breather chamber 2 is arranged adjacent to the crankshaft chamber 1 and is used for guiding and utilizing gas which is increased by air pressure in the crankshaft chamber 1 and exhausted, the crankshaft chamber 1 and the breather chamber 2 are communicated, gas pressure relief is realized, smooth flowing is realized, and the sealing performance of the internal environment of the crankshaft chamber 1 is ensured by the one-way valve sheet 4; the upper end of the one-way valve block 4 is a free end, and the lower end of the backflow groove 3 is provided with the settling tank 31, so that pressurized air in the crankcase can jack the upper end of the one-way valve block 4, the one-way valve block 4 is a strip-shaped metal elastic sheet, oil mist condensed on the one-way valve block 4 can slide into the settling tank 31, meanwhile, metal chips and other impurities generated during grinding of an engine can be adhered to the position of the one-way valve block 4 when the pressurized air is discharged, and then the oil is settled into the settling tank 31 along with the engine oil, mechanical damage caused by the fact that the oil flows into a lubricating oil way is avoided, meanwhile, the settling tank 31 can be conveniently cleaned after the one-way valve block 4 is detached during maintenance, and the engine oil circulation quality is guaranteed under the condition that the pressure of the crankshaft chamber 1 is stable. Further, the open end face of the backflow groove 3 is connected with a pressure baffle plate 5, the one-way valve plate 4 is clamped between the pressure baffle plate 5 and the open end face of the backflow groove 3, and the pressure baffle plate 5 is strip-shaped and the upper end of the pressure baffle plate 5 is bent towards one side far away from the one-way valve plate 4. Like this pressure baffle 5 can effectively retrain the deformation scope of check valve piece 4, avoids other positions of check valve piece 4 to produce the perk deformation, guarantees that the pressure release is stable and the deposition effect of impurity is stable. The pressure baffle 5 is fixedly connected with the crankcase by three bolts 6 arranged along the circumference of the pressure baffle 5. Therefore, the fixed points of the one-way valve plate 4 are arranged around the circumferential direction, and the sealing effect of the one-way valve plate 4 is improved. The pressure baffle 5 is provided with three relief through holes 51. Do benefit to like this and reduce because of 5 not enough probabilities that lead to one-way valve piece 4 to leak of the roughness of pressure shield, guarantee one-way valve piece 4's sealed effect. Preferably, the bottom surface of the settling tank 31 is inclined from top to bottom toward the side where the check valve sheet 4 is located. Therefore, the impurities deposited in the settling tank 31 can be gathered at one side close to the one-way valve plate 4, so that the impurities can be prevented from flowing out of the settling tank 31 along with the engine oil when the engine oil overflows the settling tank 31, and the deposition effect is ensured. The inner wall of the return groove 3 has a through opening 32 communicating with the crank chamber 1 from bottom to top, and the through opening 32 is disposed opposite to the deposition groove 31 below. The crankcase is provided with a combustion cylinder body 8 and a balance cylinder body 9, the combustion cylinder body 8 and the balance cylinder body 9 can be an existing assembly, and the backflow groove 3 is located below the balance cylinder body 9. The backflow groove 3 is arranged under the balance cylinder 9 which does not participate in combustion temperature rise, so that the environmental temperature in the backflow groove 3 is favorably reduced, and the condensation effect is improved.

As shown in fig. 4 and 5, the inner side wall of the breather chamber 2 is provided with a convex ring 7, and the inner cavity of the convex ring 7 forms the backflow groove 3. Thus, the heat exchange efficiency of the oil mist in the backflow groove 3 and the cooler air in the ventilation chamber 2 is improved, and the condensation speed is further promoted.

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

1. The utility model provides a ventilation structure of crankcase, crankcase include crank chamber (1) and breather chamber (2), and ventilation structure includes only enables check valve piece (4) of crank chamber (1) interior gas inflow breather chamber (2), its characterized in that, backflow groove (3) have on the inside wall of breather chamber (2), the inner chamber of backflow groove (3) with crank chamber (1) intercommunication, the direction sets up about check valve piece (4) can with the uncovered of backflow groove (3) is sealed, and the upper end of this check valve piece (4) is the free end, the lower extreme of check valve piece (4) links firmly on the uncovered terminal surface of backflow groove (3).

2. The ventilation structure of the crankcase according to claim 1, wherein the bottom surface of the inner cavity of the backflow groove (3) is provided with a deposition groove (31) extending to the position of the check valve plate (4).

3. The crankcase ventilation structure according to claim 2, wherein the bottom surface of the settling groove (31) is inclined downward toward the side where the check valve sheet (4) is located.

4. The ventilation structure of the crankcase according to claim 2, wherein the inner wall of the return groove (3) has a through opening (32) communicating with the crank chamber (1) from bottom to top, the through opening (32) being disposed opposite to the sump (31) below.

5. The ventilation structure of the crankcase according to claim 1, 2, 3 or 4, wherein a pressure baffle (5) is connected to an opening of the backflow groove (3), the check valve sheet (4) is clamped between the pressure baffle (5) and an opening end face of the backflow groove (3), the pressure baffle (5) is strip-shaped, and an upper end of the pressure baffle (5) is bent towards a side far away from the check valve sheet (4).

6. The crankcase ventilation structure according to claim 5, wherein the pressure baffle plate (5) is fixedly connected to the open end face of the return groove (3) by bolts (6) arranged circumferentially around the pressure baffle plate (5).

7. The crankcase ventilation structure according to claim 5, wherein the pressure baffle (5) has a plurality of relief through holes (51).

8. The ventilation structure of the crankcase according to claim 1, 2, 3 or 4, wherein the inner side wall of the breather chamber (2) is provided with a protruding convex ring (7), the inner cavity of the convex ring (7) forms the backflow groove (3), and the check valve sheet (4) is fixedly arranged on the convex ring (7).

9. A ventilation structure of a crankcase according to claim 1, characterized in that a combustion cylinder (8) and a balance cylinder (9) are provided on the crankcase, and the return groove (3) is located below the balance cylinder (9).