Motorcycle engine crankcase body with oil separation chamber

Abstract

The utility model discloses a motorcycle engine crankshaft box body with an oil separation chamber, which comprises a crankshaft box body formed by connecting a left crankshaft box body and a right crankshaft box body, crankshaft mounting holes and balance shaft mounting holes are arranged on the left crankshaft box body and the right crankshaft box body, and the crankshaft mounting holes and the balance shaft mounting holes are distributed in a pairwise corresponding mode. An oil collecting chamber is arranged at the lower end in the crankcase body, and the balance shaft mounting hole is arranged close to the maximum oil liquid level position of the oil collecting chamber; the bottom of the oil collection chamber is provided with an oil separation chamber which is arranged close to the balance shaft mounting hole, the upper end of the oil separation chamber is close to the maximum oil liquid height of the oil collection chamber, and one side, far away from the balance shaft mounting hole, of the oil separation chamber is provided with an oil inlet hole; an engine oil filter screen is arranged in the oil separation cavity, and an oil guide channel with one end communicated with the oil separation cavity and the other end communicated with an oil inlet of the engine oil pump is arranged on the side of the oil separation cavity.

Description

Technical Field

[0001] The utility model relates to the field of motorcycle engines, and particularly relates to a crankshaft case of a motorcycle engine with an oil separation chamber. Background Art

[0002] The crankshaft case is one of the essential components of an engine. The left crankcase and the right crankcase are buckled together and locked by closing bolts to form the engine crankshaft case. There are crankshaft mounting holes, balance shaft mounting holes, cylinder mounting surfaces, etc. provided on the crankshaft case. As Figure 1 shown, in an existing crankshaft case of the applicant, the balance shaft hole is arranged above the crankshaft mounting hole. During application, it will squeeze the space of the exhaust gas chamber arranged above. At the same time, the overall layout is not compact enough. During the operation of the balance shaft, it mainly relies on an oil stirring needle or other devices to stir the lubricating oil, so that after the lubricating oil splashes, it lubricates the balance shaft. This structure has a poor lubricating effect on the balance shaft. Based on this, the applicant wants to arrange the balance shaft hole below the crankshaft mounting hole. After the balance shaft hole is placed below, part of the shaft body is immersed in the lubricating oil in the oil collecting chamber at the lower end of the case, so as to increase the space of the exhaust gas chamber, make the layout in the crankshaft case more compact, and increase the lubricating effect of the balance shaft. However, when the engine is running, the balance shaft continuously stirs the engine oil, increasing the fluidity of the oil, which leads to an increase in the oil temperature. Then the high-temperature lubricating oil is pumped to each lubricating part of the engine by the oil pump, and further makes the entire lubricating system in a high-temperature lubricating state, which has a great impact on the service life of the engine. Based on this, the applicant wants to improve the oil collecting chamber in the crankshaft case so that the high-temperature oil cannot enter the oil pump. Summary of the Invention

[0003] Aiming at the above deficiencies existing in the prior art, the purpose of the utility model is to provide a crankshaft case of a motorcycle engine with an oil separation chamber, so as to solve the problem that the oil temperature in the oil collecting chamber in the existing crankshaft case rises after being stirred by the balance shaft and enters the oil pump and is pumped to each lubricating part of the engine, which has an impact on the service life of the engine.

[0004] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0005] A motorcycle engine crankcase with an oil separation chamber, comprising a crankcase body formed by connecting a left crankcase and a right crankcase. Crankshaft mounting holes and balance shaft mounting holes are arranged in a pairwise corresponding manner on both the left crankcase and the right crankcase. At the lower end inside the crankcase body, there is an oil sump. The balance shaft mounting holes are arranged near the maximum oil level position of the oil sump. At the bottom of the oil sump, there is an oil separation chamber arranged near the balance shaft mounting hole and with its upper end close to the maximum oil level height of the oil sump. An oil inlet hole is arranged on the side of the oil separation chamber away from the balance shaft mounting hole. An oil filter screen is arranged inside the oil separation chamber, and a oil guiding channel is arranged on the side of the oil separation chamber, with one end communicating with the oil separation chamber and the other end connected to the oil inlet of the oil pump. In this way, an oil separation chamber connected to it is added inside the oil sump, and the upper end of the oil separation chamber is close to the maximum oil level height, which can block the lubricating oil on one side of the balance shaft, making the lubricating oil on both sides of the oil separation chamber, one side being high-temperature lubricating oil and the other side being relatively low-temperature lubricating oil (about 8 - 10 °C lower than the high-temperature lubricating oil side). Although they are interconnected on both sides, the amount of high-temperature oil entering the other side is small and will not have a great impact on the oil temperature of the other side. At the same time, the oil inlet hole is arranged on the side of the low-temperature lubricating oil, facing away from the balance shaft mounting hole. Thus, the lubricating oil entering the oil separation chamber is low-temperature lubricating oil. After the lubricating oil enters the oil separation chamber, it is filtered by the oil filter screen and then enters the oil pump through the oil guiding channel, and then is pumped by the oil pump to various parts of the engine for lubrication, which can effectively ensure the smooth lubrication of each system in the engine and avoid shortening the service life of each lubricating component in the engine due to the increase in lubricating oil temperature. The oil filter screen arranged at the oil separation chamber can preliminarily filter the lubricating oil entering the oil pump to ensure the lubrication effect.

[0006] Further, the oil separation chamber includes a left oil separation plate arranged in the left crankcase and a right oil separation plate arranged in the right crankcase. The left oil separation plate and the right oil separation plate are arranged corresponding to each other, and their opposite sides are sealed and connected. The middle parts of the left oil separation plate and the right oil separation plate arch upward, and the left and right ends are fixedly connected to the bottom of the corresponding left crankcase or right crankcase. In this way, the oil separation chamber is formed after the two oil separation plates are connected to the bottom of the crankcase, with a simple structure. After the left crankcase and the right crankcase are connected, the end faces of the opposite sides of the left oil separation plate and the right oil separation plate are closely attached together to form a sealed chamber.

[0007] Further, an oil passing groove is arranged on the side of both the left oil separation plate and the right oil separation plate away from the balance shaft mounting hole. The two oil passing grooves are arranged opposite to each other to form the oil inlet hole. The oil inlet hole is arranged near the bottom of the oil sump. In this way, after the oil inlet hole is formed by the two oil passing grooves, the oil inlet hole is in the middle position and has enough space. After the oil inlet hole is arranged near the bottom, since the lubricating oil at the bottom is at a certain distance from the oil surface, its temperature is the lowest, which can effectively ensure that the temperature of the lubricating oil is in a low-temperature state and is not affected by the high-temperature lubricating oil surging from one side of the balance shaft.

[0008] Further, one side of the left oil separation plate and the right oil separation plate close to the balance shaft mounting hole is arc-shaped. In this way, the provided arc-shaped portion can make way for the operation of the balance shaft and the balance weights on the balance shaft, avoiding interference with the balance shaft.

[0009] Further, an oil baffle is provided above each of the left oil separation plate and the right oil separation plate. The two oil baffles are correspondingly arranged, below the crankshaft mounting hole, arc-shaped, and concentric with the crankshaft mounting hole; the corresponding sides of the two oil baffles are in close contact. In this way, the provided oil baffles can further prevent the lubricating oil splashed and flung out on one side of the balance shaft and the crankshaft from entering the other side, increasing the temperature of the lubricating oil on the other side. The arc-shaped setting of the oil baffles not only facilitates the lubricating oil splashed onto this place to slide along its side wall into the oil collecting chamber, but also can make way for each transmission component on the crankshaft.

[0010] Further, a partition plate extending towards the oil baffle direction and connected to the lower end of the corresponding oil baffle is provided above each of the left oil separation plate and the right oil separation plate. The widths of the two partition plates are smaller than the width of the oil baffle, and an oil passage is formed between the two partition plates. The oil passage is arranged near the maximum oil level of the oil collecting chamber. In this way, the provided partition plates and the oil separation plates together form a continuous lubricating oil gathering and sliding surface with the oil baffle above them. After the widths of the partition plates are set to be small, a channel for the lubricating oil on the left and right sides to communicate is naturally formed between the two partition plates.

[0011] Further, a plurality of heat dissipation fins are provided on the outer side of the bottom of the crankcase body. In this way, the provided heat dissipation fins correspond to the position of the oil collecting chamber, can dissipate heat from the crankcase, increase the bottom air impact area, and solve the problem of high engine heat load.

[0012] Further, a cylinder hole is further provided on the crankcase body. The center line of the cylinder hole is offset from the center line of the crankshaft mounting hole by 5 - 7 mm. In this way, the cylinder hole has an eccentric structure, which can effectively solve the problem of engine body shaking caused by the overlap of reciprocating inertia forces and solve the problem of large vibration during engine operation. Description of the Drawings

[0013] Figure 1 It is a schematic structural diagram of the left crankcase in the existing crankcase body;

[0014] Figure 2 It is a schematic structural diagram of the left crankcase in the embodiment;

[0015] Figure 3 It is a schematic structural diagram of the right crankcase in the embodiment;

[0016] Figure 4 It is a schematic cross-sectional structural diagram of the right crankcase in the embodiment;

[0017] Figure 5 It is a bottom-up view of the right crankcase in the embodiment. Specific embodiments

[0018] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. Components of the embodiments of the present utility model generally described and illustrated in the drawings herein may be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the present utility model provided in the drawings is not intended to limit the scope of the claimed present utility model, but is merely representative of selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the scope of protection of the present utility model.

[0019] It should be noted that like reference numerals and letters denote like items in the following drawings. Therefore, once an item is defined in one drawing, it does not require further definition and explanation in subsequent drawings. In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the inventive product is customarily placed during use. This is only for convenience in describing the present utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present utility model. In addition, the terms "first", "second", "third", etc. are only used for descriptive distinction and should not be construed as indicating or implying relative importance. In addition, terms such as "horizontal" and "vertical" do not mean that the components are required to be absolutely horizontal or hanging, but may be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but may be slightly inclined. In the description of the present utility model, it should also be noted that unless otherwise clearly specified and defined, the terms "set", "installed", "connected", "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected, or indirectly connected through an intermediate medium, and may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0020] Such as Figures 2 - 5As shown in the figure, the motorcycle engine crankcase body with an oil separation chamber 6 provided in this embodiment includes a crankcase body formed by connecting a left crankcase body 1 and a right crankcase body 2. Crankshaft mounting holes 3 and balance shaft mounting holes 4 are provided in pairs and distributed correspondingly on the left crankcase body 1 and the right crankcase body 2. At the lower end inside the crankcase body, there is an oil collecting chamber 5. The balance shaft mounting hole 4 is arranged near the maximum oil level position of the oil collecting chamber 5 ( Figure 2 the dotted line in the figure). An oil separation chamber 6 is provided at the bottom of the oil collecting chamber 5, which is close to the balance shaft mounting hole 4 and the upper end is close to the maximum oil height of the oil collecting chamber 5. An oil inlet hole 63 is provided on the side of the oil separation chamber 6 away from the balance shaft mounting hole 4, and the oil inlet hole 63 is arranged close to the bottom of the oil collecting chamber 5. An oil filter screen 7 is arranged inside the oil separation chamber 6, and an oil guiding channel 64 is arranged on the side of the oil separation chamber 6, with one end communicating with the oil separation chamber 6 and the other end communicating with the oil inlet of the oil pump. Adding an oil separation chamber 6 communicating with the oil collecting chamber 5 in the oil collecting chamber 5, and the upper end of the oil separation chamber 6 is close to the maximum oil level height, can form a barrier to the lubricating oil on one side of the balance shaft, so that the lubricating oil on both sides of the oil separation chamber 6, one side is high-temperature lubricating oil and the other side is relatively low-temperature lubricating oil. Although they are interconnected, the amount of high-temperature oil entering the other side is small and will not have a great impact on the oil temperature on the other side. At the same time, the oil inlet hole 63 is arranged at a position facing away from the balance shaft mounting hole 4 and on the side of the relatively low-temperature lubricating oil. Therefore, the lubricating oil entering the oil separation chamber 6 is relatively low-temperature lubricating oil. After the lubricating oil enters the oil separation chamber 6, it is filtered by the oil filter screen 7 and then enters the oil pump through the oil guiding channel, and then is pumped to various parts of the engine by the oil pump for lubrication, which can effectively ensure the smooth lubrication of each system in the engine and avoid shortening the service life of each lubricating component in the engine due to the increase in lubricating oil temperature. The oil filter screen 7 arranged at the oil separation chamber 6 can preliminarily filter the lubricating oil entering the oil pump to ensure the lubrication effect.

[0021] Furthermore, the oil separation chamber 6 includes a left oil separation plate 61 arranged in the left crankcase body 1 and a right oil separation plate 62 arranged in the right crankcase body 2. The left oil separation plate 61 and the right oil separation plate 62 are arranged correspondingly, and the opposite sides are sealed and connected. The middle parts of the left oil separation plate 61 and the right oil separation plate 62 arch upward, and the left and right ends are fixedly connected to the bottom of the corresponding left crankcase body 1 or right crankcase body 2. In this way, the oil separation chamber 6 is formed after two oil separation plates are connected to the bottom of the box body, and the structure is simple. After the left crankcase body 1 and the right crankcase body 2 are connected, the end faces of the opposite sides of the left oil separation plate 61 and the right oil separation plate 62 are closely attached together to form a sealed chamber.

[0022] Further, an oil passing groove is provided on one side of the left oil separation plate 61 and the right oil separation plate 62 away from the balance shaft mounting hole 4. The two oil passing grooves are arranged oppositely to form the oil inlet hole 63. In this way, after the oil inlet hole 63 is formed by the two oil passing grooves, the oil inlet hole 63 is in the middle position and has sufficient space. After the oil inlet hole 63 is arranged close to the bottom, since the lubricating oil at the bottom position is at a certain distance from the oil surface, the temperature is the lowest, which can effectively ensure that the temperature of the lubricating oil is at normal temperature and is not affected by the high-temperature lubricating oil surging from one side of the balance shaft.

[0023] Further, the sides of the left oil separation plate 61 and the right oil separation plate 62 close to the balance shaft mounting hole 4 are arc-shaped. In this way, the provided arc-shaped part can make way for the balance shaft and the balance weights on the balance shaft during operation, avoiding interference with the balance shaft.

[0024] Further, an oil baffle 65 is provided above the left oil separation plate 61 and the right oil separation plate 62. The two oil baffles 65 are arranged correspondingly, under the crankshaft mounting hole 3, are arc-shaped, and are concentric with the crankshaft mounting hole 3; the corresponding sides of the two oil baffles 65 are closely attached. In this way, the provided oil baffle 65 can further block the lubricating oil splashed and thrown out from one side of the balance shaft and the crankshaft from entering the other side, increasing the temperature of the lubricating oil on the other side. The oil baffle 65 is arranged in an arc shape, which not only facilitates the lubricating oil splashed onto it to slide along its side wall into the oil collecting chamber 5, but also can make way for each transmission component on the crankshaft. To improve the strength of the oil baffle, a local outward protrusion is formed on the oil baffle to form a rib.

[0025] Further, a partition plate extending towards the oil baffle 65 and connected to the lower end of the corresponding oil baffle 65 is provided above the left oil separation plate 61 and the right oil separation plate 62. The widths of the two partition plates are smaller than the width of the oil baffle 65, and an oil passing channel is formed between the two partition plates. The oil passing channel is arranged close to the maximum oil level of the oil collecting chamber 5. In this way, the provided partition plates and the oil separation plates together form a continuous lubricating oil gathering and sliding surface with the oil baffle 65 above them. After the widths of the partition plates are set to be small, a channel for connecting the lubricating oil on the left and right sides is naturally formed between the two partition plates.

[0026] Further, a plurality of heat dissipation fins are provided on the outer side of the bottom of the crankcase body. In this way, the provided heat dissipation fins correspond to the position of the oil collecting chamber 5, can dissipate heat from the crankcase, increase the bottom air impact area, and solve the problem of high engine heat load.

[0027] Further, a cylinder hole is also provided on the crankcase body. The center line of the cylinder hole is offset from the center line of the crankshaft mounting hole 3 by 5 - 7 mm. In this way, the cylinder hole has an eccentric structure, which can effectively solve the jitter caused by the overlap of reciprocating inertia forces and solve the problem of large vibration during engine operation.

[0028] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model rather than to limit them. Those of ordinary skill in the art should understand that any modifications or equivalent replacements made to the technical solutions of the present utility model without departing from the spirit and scope of the technical solutions should be covered within the scope of the claims of the present utility model.

Claims

1. A motorcycle engine crankcase with an oil separation chamber, comprising a crankcase body formed by connecting a left crankcase and a right crankcase. Crankshaft mounting holes and balance shaft mounting holes are arranged in pairs and correspondingly on both the left crankcase and the right crankcase. At the lower end inside the crankcase body, there is an oil sump, and the balance shaft mounting holes are arranged near the maximum oil level position of the oil sump; it is characterized in that, An oil separation chamber is provided at the bottom of the oil collecting chamber, which is arranged close to the balance shaft mounting hole and the upper end of which is close to the maximum oil level of the oil collecting chamber. An oil inlet hole is provided on one side of the oil separation chamber away from the balance shaft mounting hole; an oil filter screen is provided in the oil separation chamber, and an oil guiding channel is provided on the side of the oil separation chamber, with one end communicating with the oil separation chamber and the other end communicating with the oil inlet of the oil pump.

2. The motorcycle engine crankcase with an oil separation chamber according to claim 1, characterized in that, The oil separation chamber includes a left oil separation plate arranged in the left crankcase body and a right oil separation plate arranged in the right crankcase body. The left oil separation plate and the right oil separation plate are arranged correspondingly, and the opposite sides are sealed and connected. The middle parts of the left oil separation plate and the right oil separation plate arch upward, and the left and right ends are fixedly connected to the bottom of the corresponding left crankcase body or right crankcase body.

3. The motorcycle engine crankcase with an oil separation chamber according to claim 2, characterized in that, An oil passing groove is provided on one side of each of the left oil separation plate and the right oil separation plate away from the balance shaft mounting hole. The two oil passing grooves are arranged correspondingly to form the oil inlet hole; the oil inlet hole is arranged close to the bottom of the oil collecting chamber.

4. The motorcycle engine crankcase with an oil separation chamber according to claim 2, characterized in that, The sides of the left oil separation plate and the right oil separation plate close to the balance shaft mounting hole are arc-shaped.

5. The motorcycle engine crankcase with an oil separation chamber according to claim 2 or 3 or 4, characterized in that, An oil baffle is provided above each of the left oil separation plate and the right oil separation plate. The two oil baffles are arranged correspondingly, below the crankshaft mounting hole, arc-shaped, and concentric with the crankshaft mounting hole; the corresponding sides of the two oil baffles are closely attached.

6. The motorcycle engine crankcase with an oil separation chamber according to claim 5, characterized in that, A partition plate extending towards the oil baffle and connected to the lower end of the corresponding oil baffle is provided above each of the left oil separation plate and the right oil separation plate. The widths of the two partition plates are smaller than the width of the oil baffle, and an oil passing channel is formed between the two partition plates. The oil passing channel is arranged close to the maximum oil level of the oil collecting chamber.

7. The motorcycle engine crankcase with an oil separation chamber according to claim 1 or 2 or 3 or 4 or 6, characterized in that, A plurality of heat dissipation fins are provided on the outer side of the bottom of the crankcase body.

8. The crankcase of a motorcycle engine with an oil separation chamber according to claim 7, characterized in that, A cylinder hole is further provided on the crankcase body, and the center line of the cylinder hole is offset from the center line of the crankshaft mounting hole by 5-7 mm.

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