Crankcase of motorcycle engine

Abstract

The utility model discloses a motorcycle engine crankcase which comprises a left crankcase body and a right crankcase body, a left crankshaft cavity is formed in the side, facing the right crankcase body, of the left crankcase body, a left cover cavity is formed in the side, back to the right crankcase body, of the left crankcase body, a right crankshaft cavity is formed in the side, facing the left crankcase body, of the right crankcase body, and a right cover cavity is formed in the side, back to the right crankcase body, of the right crankcase body. A right cover cavity is formed in the side, back to the left box body, of the right box body, a waste gas labyrinth cavity is formed between the left box body and the right box body, a first partition plate and a second partition plate are arranged between the lower portion of the left box body and the lower portion of the right box body, and the first partition plate and the second partition plate are distributed in the vertical direction. An open type separation cavity is formed between the first separation plate and the second separation plate, the left box body is provided with a left oil through hole for communicating the separation cavity with the left cover cavity, and the right box body is provided with a right oil through hole for communicating the separation cavity with the right cover cavity. According to the scheme, the problem that in the prior art, engine oil of a crankcase splashes, and a lubricating oil way is complex is solved.

Description

Technical Field

[0001] The utility model relates to a crankcase of a motorcycle engine. Background Art

[0002] The crankcase of a motorcycle engine is a device on the engine where the crankshaft and various speed gear mechanisms are installed. The crankcase surrounds the crankshaft and various speed gear mechanisms by setting a shell, and injects engine oil into the shell to lubricate each moving part to ensure the normal use of the crankcase.

[0003] Chinese patent document CN209040985U discloses a motorcycle crankcase device, including: a crankcase, a crankshaft, a driving gear, an oil pump and a driven gear. The crankcase is formed by a right crankcase and a left crankcase, and there is an oil pan in the crankcase, which is divided into a first oil return chamber, a second oil return chamber, a third oil return chamber and a fourth oil return chamber which are interconnected by two partitions; the crankshaft is arranged in the crankcase, the driving gear is arranged on the crankshaft and rotates coaxially with the crankshaft; the oil pump is arranged in the crankcase; in addition, the driven gear is arranged on the oil pump and is driven by the driving gear to rotate synchronously. The horizontal height of the fourth oil return chamber can be lower than that of the first oil return chamber, the second oil return chamber and the third oil return chamber to ensure that the position of the oil pump inlet is located at the lowest level of all the oil chambers of the oil pan. The effect of the solution of the prior art is that the oil return of the oil pan first enters the first oil return chamber through a notch, then partially enters the second oil return chamber or the third oil return chamber, and finally enters the fourth oil return chamber; in addition, the oil pump has an oil pump inlet, which is located in the fourth oil return chamber. Therefore, it can be ensured that the oil with less bubbles can reach the vicinity of the oil pump inlet, and then be sucked by the oil pump, thereby increasing the oil pressure of the main oil circuit.

[0004] In the above-mentioned prior art solution, the performance of the crankcase is improved by reducing the bubbles in the engine oil. However, such a setting will make the oil circuit structure of the engine oil splash lubrication of the crankcase more complicated, thereby increasing the difficulty of processing. Utility Model Content

[0005] The utility model aims to provide a motorcycle engine crankcase to solve the problem of oil splashing and complicated lubricating oil path of the crankcase in the prior art.

[0006] In order to achieve the above-mentioned purpose, the basic scheme of the utility model provides a motorcycle engine crankcase, including a left case body and a right case body, a left crankshaft cavity is arranged on the side of the left case body facing the right case body, a left cover cavity is arranged on the side of the left case body facing away from the right case body, a right crankshaft cavity is arranged on the side of the right case body facing the left case body, a right cover cavity is arranged on the side of the right case body facing away from the left case body, an exhaust gas maze cavity is arranged between the left case body and the right case body, a first partition plate and a second partition plate are arranged between the lower part of the left case body and the lower part of the right case body, the first partition plate and the second partition plate are distributed vertically, and an open partition cavity is formed between the first partition plate and the second partition plate, the left case body is provided with a left oil hole connecting the partition cavity with the left cover cavity, and the right case body is provided with a right oil hole connecting the partition cavity with the right cover cavity.

[0007] The beneficial effect of this basic scheme is that an open partition chamber is formed by the first partition plate and the second partition plate, so that the oil mist generated by the splash lubrication in the crankshaft chamber enters the partition chamber under the rotational diversion action of the crank, and enters the left cover chamber through the left oil hole for lubrication, and enters the right cover chamber through the right oil hole for lubrication, thereby simplifying the crankcase oil splash lubrication oil circuit, which is beneficial to reducing the processing difficulty while ensuring the working performance of the crankcase.

[0008] Preferably, the first partition plate and the second partition plate are both located below the crankshaft mounting hole. Such an arrangement is conducive to further improving the lubrication effect of the oil mist in the crankshaft cavity entering the left cover cavity and the right cover cavity through the partition cavity.

[0009] Preferably, the left oil hole connects the bottom of the left cover cavity with the partition cavity. With such a configuration, the left oil hole can not only guide the oil mist from the crankshaft cavity into the left cover cavity, but also return the oil accumulated in the left cover cavity to the crankshaft cavity, thereby realizing the recycling of the oil, thereby further simplifying the structure.

[0010] Preferably, the right case is provided with an oil return hole connecting the bottom of the right cover cavity with the right crankshaft cavity. With such a configuration, the oil accumulated in the right cover cavity can be returned to the crankshaft cavity in time, so as to realize the recycling of the oil.

[0011] Preferably, the inner wall of the left crankshaft cavity and the inner wall of the right crankshaft cavity are both smooth. Such a setting is conducive to reducing the running friction of the exhaust gas and oil mist in the crankshaft cavity, thereby reducing the movement resistance of the crankshaft, and further helping to further improve the performance of the motorcycle engine.

[0012] Preferably, the exhaust gas labyrinth chamber includes a first labyrinth chamber, a second labyrinth chamber, a third labyrinth chamber, a fourth labyrinth chamber and a fifth labyrinth chamber, the first labyrinth chamber is arranged on the same side as the right cover chamber, the second labyrinth chamber and the third labyrinth chamber are arranged on the same side as the right crankshaft chamber, the fourth labyrinth chamber and the fifth labyrinth chamber are arranged on the same side as the left crankshaft chamber, the first labyrinth chamber is connected to the right cover chamber, the right case is provided with a guide hole connecting the first labyrinth chamber with the second labyrinth chamber, the fourth labyrinth chamber connects the second labyrinth chamber with the third labyrinth chamber, the third labyrinth chamber connects the fourth labyrinth chamber with the fifth labyrinth chamber, the upper part of the right case is provided with an exhaust gas hole connecting the upper part of the right crankshaft chamber with the upper part of the right cover chamber, and the left case is provided with an exhaust gas nozzle connected to the fifth labyrinth chamber. With such an arrangement, the exhaust gas labyrinth chamber has a better separation effect on the oil components carried in the exhaust gas, which is conducive to further avoiding the occurrence of oil spraying from the crankcase.

[0013] Preferably, the bottom of the third labyrinth chamber, the bottom of the fourth labyrinth chamber and the bottom of the fifth labyrinth chamber are all arranged to be inclined downward in the same direction, and a reflux groove communicating with the left crankshaft chamber is arranged at the lowest point of the bottom of the fifth labyrinth chamber. Such an arrangement is conducive to timely reflux of the oil accumulated in the exhaust labyrinth chamber to the crankshaft chamber, avoiding excessive accumulation of oil in the exhaust labyrinth chamber and being carried out of the crankcase by the pressurized gas, thereby further avoiding waste of oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the left case of a crankcase embodiment of a motorcycle engine of the utility model;

[0015] Figure 2 for Figure 1 Rear view of the center left box;

[0016] Figure 3 It is a schematic diagram of a right case body of a crankcase embodiment of a motorcycle engine of the utility model;

[0017] Figure 4 for Figure 3 Rear view of the center right cabinet. DETAILED DESCRIPTION

[0018] The following is further described in detail through specific implementation methods:

[0019] The figure marks in the drawings of the specification include: first partition 1, second partition 2, partition chamber 3, left oil hole 4, oil suction port 5, crankshaft mounting hole 6, first labyrinth chamber 71, guide hole 72, second labyrinth chamber 73, third labyrinth chamber 74, fourth labyrinth chamber 75, fifth labyrinth chamber 76, exhaust nozzle 8, left cover chamber 9, right oil hole 10, oil return hole 11, right cover chamber 12, exhaust hole 13, reflux groove 14, left crankshaft chamber 15, right crankshaft chamber 16.

[0020] The embodiment is basically as shown in the attached Figures 1 to 4 As shown: A crankcase of a motorcycle engine, comprising a left case and a right case, a left crankshaft cavity 15 is arranged on the side of the left case facing the right case, and a right crankshaft cavity 16 is arranged on the side of the right case facing the left case, so that the left case and the right case are buckled together to form a crankshaft cavity for accommodating the crankshaft. A left cover cavity 9 is arranged on the side of the left case facing away from the right case, and a right cover cavity 12 is arranged on the side of the right case facing away from the left case.

[0021] A first partition plate 1 and a second partition plate 2 are disposed between the lower portion of the left case and the lower portion of the right case. The first partition plate 1 and the second partition plate 2 are distributed vertically, and an open partition chamber 3 is formed between the first partition plate 1 and the second partition plate 2, so that the partition chamber 3 is connected to the crankshaft chamber. In this embodiment, the first partition plate 1 and the second partition plate 2 are both located below the crankshaft mounting hole 6.

[0022] The left case is provided with a left oil hole 4 connecting the partition chamber 3 with the left cover chamber 9. In this embodiment, the left oil hole 4 connects the bottom of the left cover chamber 9 with the partition chamber 3, so that the oil in the left cover chamber 9 can flow back to the partition chamber 3 through the left oil hole 4, and finally flow back to the crank chamber.

[0023] The right case is provided with a right oil hole 10 connecting the partition chamber 3 with the right cover chamber 12. The right case is provided with an oil return hole 11 connecting the bottom of the right cover chamber 12 with the right crankshaft chamber 16, so as to facilitate the oil in the right cover chamber 12 to flow back to the right crankshaft chamber 16. The inner wall of the left crankshaft chamber 15 and the inner wall of the right crankshaft chamber 16 are both provided with a smooth surface, which is beneficial to reduce the running friction of the exhaust gas and oil mist, and is beneficial to improve the performance of the engine.

[0024] In this embodiment, an exhaust gas labyrinth chamber is arranged between the left box body and the right box body. Preferably, the exhaust gas labyrinth chamber includes a first labyrinth chamber 71, a second labyrinth chamber 73, a third labyrinth chamber 74, a fourth labyrinth chamber 75 and a fifth labyrinth chamber 76. The first labyrinth chamber 71 is arranged on the same side as the right cover chamber 12, the second labyrinth chamber 73 and the third labyrinth chamber 74 are arranged on the same side as the right crankshaft chamber 16, the fourth labyrinth chamber 75 and the fifth labyrinth chamber 76 are arranged on the same side as the left crankshaft chamber 15, the first labyrinth chamber 71 is connected to the right cover chamber 12, and the right The box body is provided with a guide hole 72 connecting the first labyrinth chamber 71 with the second labyrinth chamber 73, the fourth labyrinth chamber 75 connects the second labyrinth chamber 73 with the third labyrinth chamber 74, the third labyrinth chamber 74 connects the fourth labyrinth chamber 75 with the fifth labyrinth chamber 76, the upper part of the right box body is provided with an exhaust hole 13 connecting the upper part of the right crankshaft chamber 16 with the upper part of the right cover chamber 12, and the left box body is provided with an exhaust nozzle 8 connected with the fifth labyrinth chamber 76.

[0025] Preferably, the bottom of the third labyrinth chamber 74, the bottom of the fourth labyrinth chamber 75 and the bottom of the fifth labyrinth chamber 76 are all inclined downward in the same direction, and a reflux groove 14 connected to the left crankshaft chamber 15 is provided at the lowest point of the bottom of the fifth labyrinth chamber 76. Thus, the engine oil separated from the gas in the exhaust labyrinth chamber flows back to the left crankshaft chamber 15 for reuse.

[0026] In this embodiment, after the left case and the right case are buckled together, the bottom of the left case and the bottom of the right case together form the oil pan of the crankcase, so as to facilitate the collection of the engine oil. The bottom of the left case is provided with an oil suction port 5, which is located at the lowest point of the oil pan.

[0027] By adopting this solution, an open partition chamber 3 is formed by the first partition plate 1 and the second partition plate 2, so that the oil mist generated by the splash lubrication in the crankshaft cavity enters the partition chamber 3 under the rotation and diversion action of the crank, and enters the left cover cavity 9 through the left oil hole 4 for lubrication, and enters the right cover cavity 12 through the right oil hole 10 for lubrication, thereby simplifying the oil splash lubrication oil path of the crankcase, which is beneficial to reduce the processing difficulty while ensuring the working performance of the crankcase. At the same time, this solution can reduce the running friction of the exhaust gas and oil mist in the crankshaft cavity, thereby reducing the movement resistance of the crankshaft, and further helps to further improve the performance of the motorcycle engine. Moreover, the exhaust gas in the crankshaft cavity passes through the exhaust hole 13, the right cover cavity 12, the first labyrinth cavity 71, the diversion hole 72, the second labyrinth cavity 73, the fourth labyrinth cavity 75, the third labyrinth cavity 74 and the fifth labyrinth cavity 76 in sequence, and is finally discharged from the exhaust nozzle 8 ( Figure 4 The middle dotted arrow indicates the flow path of the exhaust gas), so that the exhaust gas labyrinth chamber can better separate the oil components carried in the exhaust gas, which is helpful to further avoid the oil from spraying out of the crankcase.

[0028] The above is only an embodiment of the utility model, and the common knowledge such as the known specific structure and characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several deformations and improvements can be made without departing from the structure of the utility model, which should also be regarded as the protection scope of the utility model, and these will not affect the effect of the implementation of the utility model and the practicality of the patent.

Claims

1. A motorcycle engine crankcase, comprising a left case and a right case, wherein the left case is provided with a left crankshaft cavity on the side facing the right case, the left case is provided with a left cover cavity on the side facing away from the right case, the right case is provided with a right crankshaft cavity on the side facing the left case, the right case is provided with a right cover cavity on the side facing away from the left case, and an exhaust gas labyrinth cavity is provided between the left case and the right case, characterized in that: A first partition and a second partition are arranged between the lower part of the left box body and the lower part of the right box body, the first partition and the second partition are distributed vertically, and an open partition cavity is formed between the first partition and the second partition. The left box body is provided with a left oil hole connecting the partition cavity with the left cover cavity, and the right box body is provided with a right oil hole connecting the partition cavity with the right cover cavity.

2. A motorcycle engine crankcase according to claim 1, characterized in that: The first partition plate and the second partition plate are both located below the crankshaft mounting hole.

3. A motorcycle engine crankcase according to claim 2, characterized in that: The left oil hole connects the bottom of the left cover cavity with the partition cavity.

4. A motorcycle engine crankcase according to claim 3, characterized in that: The right case is provided with an oil return hole which connects the bottom of the right cover cavity with the right crankshaft cavity.

5. A motorcycle engine crankcase according to claim 4, characterized in that: The inner wall of the left crankshaft cavity and the inner wall of the right crankshaft cavity are both arranged in a smooth surface.

6. A motorcycle engine crankcase according to any one of claims 1 to 5, characterized in that: The exhaust gas labyrinth chamber includes a first labyrinth chamber, a second labyrinth chamber, a third labyrinth chamber, a fourth labyrinth chamber and a fifth labyrinth chamber. The first labyrinth chamber is arranged on the same side as the right cover chamber, the second labyrinth chamber and the third labyrinth chamber are arranged on the same side as the right crankshaft chamber, the fourth labyrinth chamber and the fifth labyrinth chamber are arranged on the same side as the left crankshaft chamber, the first labyrinth chamber is connected with the right cover chamber, the right box body is provided with a guide hole connecting the first labyrinth chamber with the second labyrinth chamber, the fourth labyrinth chamber connects the second labyrinth chamber with the third labyrinth chamber, the third labyrinth chamber connects the fourth labyrinth chamber with the fifth labyrinth chamber, the upper part of the right box body is provided with an exhaust gas hole connecting the upper part of the right crankshaft chamber with the upper part of the right cover chamber, and the left box body is provided with an exhaust gas nozzle connected with the fifth labyrinth chamber.

7. A motorcycle engine crankcase according to claim 6, characterized in that: The bottom of the third labyrinth chamber, the bottom of the fourth labyrinth chamber and the bottom of the fifth labyrinth chamber are all arranged to be inclined downward in the same direction, and a reflux groove communicating with the left crankshaft chamber is arranged at the lowest point of the bottom of the fifth labyrinth chamber.

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