A motorcycle engine crankcase

Abstract

The application discloses a motorcycle engine crankcase and relates to the technical field of engine crankcases. The motorcycle engine crankcase comprises a sealed and assembled upper crankcase and a lower crankcase, the bottom of the lower crankcase is formed with an oil pan, and the side surfaces of the upper crankcase and the lower crankcase are provided with cover plates. The motorcycle engine crankcase is provided with a flow guide mechanism, so that the lubricating oil in the oil pan is deflected along the oil inlet cavity and the oil outlet groove of the oil guide plate, thereby smoothly flowing the lubricating oil in the oil pan from the oil guide plate to the oil return port, preventing the floating iron filings residues in the oscillating lubricating oil in the oil pan from being guided outwards, and further adjusting the angle of the filter collecting box to accumulate the lubricating oil in the oil suction sleeve area, so as to realize the accelerated pumping of the lubricating oil without floating iron filings to meet the accelerated operation of the engine. Moreover, the external filter collecting box is arranged outside the oil pan, so that the overall size of the crankcase is reduced, and the external filter collecting box for filtering the lubricating oil is convenient to maintain.

Description

Technical Field

[0001] This invention relates to the field of engine crankcase technology, specifically to a motorcycle engine crankcase. Background Technology

[0002] The crankcase is a core component of a motorcycle engine, serving multiple functions including support, sealing, lubrication, and power transmission. The lower part of the crankcase typically functions as an oil pan to store lubricating oil. Internally, it features an oil baffle and a magnetic drain plug to prevent oil splashing and to attract metal debris. The oil pump, driven by gears, pumps oil from the oil pan, which is then filtered by an oil filter and delivered to various friction points, creating a forced lubrication cycle.

[0003] Existing crankcases typically have a built-in filter assembly inside the oil pan. When the oil pump draws in lubricating oil, it first passes through the filter assembly for coarse filtration. The oil pump then sends the coarsely filtered oil to a filter for fine filtration, and finally pumps the finely filtered oil to various friction points. This built-in filter assembly results in a larger oil pan volume, requiring more space when installed on a motorcycle. Furthermore, if the filter assembly malfunctions after prolonged use, the oil pan needs to be removed for repair, which is extremely difficult for a crankcase installed on a motorcycle. Summary of the Invention

[0004] The purpose of this invention is to provide a crankcase for a motorcycle engine to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a motorcycle engine crankcase, comprising a sealed upper crankcase and a lower crankcase, wherein an oil pan is formed at the bottom of the lower crankcase, and cover plates are installed on the sides of the upper and lower crankcases, and a gear pump is installed on the outer side of the cover plates; The lower crankcase is provided with a flow guiding mechanism on the side near the cover plate to guide the lubricating oil in the oil pan to remove sediment. The flow guiding mechanism includes a groove opened in the inner wall of the lower crankcase. The side of the lower crankcase is provided with an oil return port communicating with the groove. A pressure cap is embedded in the groove with sealant. An oil guide plate is connected to the middle of the pressure cap. The lubricating oil that is guided to the outside through the oil guide plate is treated to remove sediment. The lower crankcase is provided with a slag filter mechanism on the outer side near the cover plate. The slag filter mechanism includes a filter box that is movably connected to the oil return port, which is used to draw the lubricating oil in the oil pan outward.

[0006] Preferably, a cylinder for reciprocating piston motion is installed on the outer top surface of the upper crankcase, and the crankshaft body is connected to the inside of the lower crankcase through a bearing. The crankshaft body is connected to the piston sliding in the cylinder through a crank connecting rod. One end of one of the gears in the gear pump is connected to one end of the crankshaft body, and the rotating crankshaft body drives the gear pump to operate.

[0007] Preferably, the lower edge of the groove is aligned with the surface of the oil pan, and the oil return port extends toward the center of the oil pan surface.

[0008] Preferably, the lower crankcase is fastened to the gland by locking bolts, and a positioning hole through the lower crankcase is opened on the surface of the groove. A heat-conducting column passing through the positioning hole is fixed on one side of the gland. The heat-conducting column leading out of the lower crankcase absorbs the heat on the surface of the gland, so that the heat is quickly transferred to the outside of the lower crankcase.

[0009] Preferably, a partition is provided in the middle of the oil guide plate, and an oil inlet chamber and an oil outlet groove are respectively opened on both sides of the oil guide plate near the partition. A semi-circular baffle is provided at the bottom of the partition near the oil return port, and the extended side of the oil return port is divided into two sections by the semi-circular baffle. The two oil return ports located on both sides of the semi-circular baffle are connected to the oil inlet chamber and the oil outlet groove, respectively. The connecting end of the oil inlet chamber and the oil outlet groove is higher than the position of the oil return port. The bottom of the oil guide plate and the semi-circular baffle are equipped with sealing strips.

[0010] Preferably, a hydraulic rod is movably connected between the filter box and the lower crankcase, and the filter box is rotated at an angle on one side of the oil return port by extending and retracting the hydraulic rod.

[0011] Preferably, the filter box has a matching port on the side near the oil return port, and a rotary joint is connected between the oil return port and the matching port. The filter box deflects around the axis of the rotary joint.

[0012] Preferably, an oil suction sleeve is inserted into the side of the filter box away from the lower crankcase. The end of the oil suction sleeve extending out of the filter box is integrally formed with a plug. The plug is threadedly connected to the filter box. A support plate is provided on one side of the plug. The plug is connected to the filter box by a fastening screw.

[0013] Preferably, the surface of the oil suction sleeve is provided with a V-shaped manifold at equal angles, and the side of the oil suction sleeve near the manifold is provided with a through hole communicating with the center of the oil suction sleeve.

[0014] Preferably, a coarse filter cylinder sleeved on the outside of the oil suction sleeve is threaded to one side of the plug, and a bent pipe is connected to one end of the plug. Oil is transported between the bent pipe and the oil inlet side of the gear pump through a rubber hose.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: The crankcase of this motorcycle engine, by setting a flow guiding mechanism, allows the lubricating oil in the oil pan to flow smoothly along the oil inlet chamber and oil outlet groove of the oil guide plate, thereby preventing the lubricating oil in the oil pan from flowing smoothly from the oil guide plate to the oil return port. This prevents the oscillating lubricating oil in the oil pan from carrying floating iron filings and residues outward. Furthermore, the adjustable angle filter box allows the lubricating oil to accumulate in the oil suction sleeve area, thereby accelerating the suction of lubricating oil without floating iron filings to meet the acceleration of the engine. Moreover, placing the filter box outside the oil pan can reduce the overall size of the crankcase and facilitate the maintenance of the externally placed primary filter of lubricating oil. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the separation of the upper and lower crankcases of the present invention; Figure 2 This is a three-dimensional structural diagram of the crankcase and cover plate docking according to the present invention; Figure 3 This is a three-dimensional exploded view of the first structure of the linkage between the crankcase and the flow guiding mechanism of the present invention; Figure 4 This is a schematic diagram of the second three-dimensional exploded structure of the linkage between the crankcase and the flow guiding mechanism of the present invention; Figure 5 This is a three-dimensional cross-sectional view of the crankcase of the present invention; Figure 6 This is a three-dimensional exploded structural diagram of the linkage between the crankcase, the flow guiding mechanism, and the filter cake mechanism of the present invention. Figure 7 This is a three-dimensional structural diagram of the linkage between the crankcase and the filter mechanism of the present invention; Figure 8 This is a first three-dimensional structural schematic diagram of the oil guide plate of the present invention; Figure 9 This is a schematic diagram of the second three-dimensional structure of the oil guide plate of the present invention; Figure 10 This is a three-dimensional cross-sectional view of the filter box of the present invention; Figure 11 This is a three-dimensional structural diagram of the oil-absorbing sleeve of the present invention; Figure 12 This is a three-dimensional cross-sectional view of the oil suction sleeve and the coarse filter cylinder of the present invention.

[0017] In the diagram: 1. Upper crankcase; 2. Lower crankcase; 201. Crankshaft body; 3. Oil pan; 4. Cover plate; 401. Gear pump; 5. Flow guiding mechanism; 501. Groove; 502. Oil return port; 503. Pressure cap; 504. Heat guiding column; 505. Positioning hole; 506. Oil guide plate; 5061. Baffle plate; 5062. Oil inlet chamber; 5063. Oil outlet groove; 6. Filtering mechanism; 601. Filter box; 602. Connecting port; 603. Oil suction sleeve; 604. Plug; 605. Manifold; 606. Through hole; 607. Coarse filter cartridge; 608. Fastening screw; 609. Hydraulic rod; 7. Rotary joint; 8. Rubber hose. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Please see Figure 1 and Figure 2 This invention provides a technical solution: a motorcycle engine crankcase, comprising a sealed upper crankcase 1 and a lower crankcase 2. An oil pan 3 is formed at the bottom of the lower crankcase 2. A cylinder for piston reciprocating motion is mounted on the outer top surface of the upper crankcase 1. A crankshaft body 201 is connected to the interior of the lower crankcase 2 via bearings. The crankshaft body 201 is connected to a piston sliding within the cylinder via a crankshaft connecting rod. Cover plates 4 are mounted on the sides of the upper crankcase 1 and the lower crankcase 2. A gear pump 401 is mounted on the outer side of the cover plate 4. One end of one of the gears of 01 is connected to one end of the crankshaft body 201. The rotating crankshaft body 201 drives the gear pump 401 to operate. The cover plate 4 can shield the components inside the upper crankcase 1 and the lower crankcase 2 and also seal the flow of lubricating oil. The piston reciprocates in the cylinder to push and pull the crank connecting rod, causing the crank connecting rod to drive the crankshaft body 201 to rotate. Thus, the rotating crankshaft body 201 can drive the lubricating oil in the oil pan 3 to splash onto the crank connecting rod for lubrication.

[0020] Please see Figure 3 and Figure 5The bottom center of the oil pan 3 is connected to a drain bolt with a magnet. The drain bolt with a magnet attracts the iron filings in the oil pan 3, so that the iron filings and residues from the wear of various parts in the crankcase can be attracted to the oil pan 3 near the drain bolt. When the lubricating oil needs to be changed, the waste oil can be quickly discharged by unscrewing the drain bolt, and the removed drain bolt can also bring out the iron filings and waste. The bottom surface of the oil pan 3 is provided with heat dissipation grooves to dissipate heat and cool the lubricating oil in the oil pan 3.

[0021] Please see Figures 3-6 A flow guiding mechanism 5 is provided on the side of the lower crankcase 2 near the cover plate 4 to guide the lubricating oil in the oil pan 3 to remove sediment. The flow guiding mechanism 5 includes a groove 501 opened in the inner wall of the lower crankcase 2. The lower edge of the groove 501 is flush with the surface of the oil pan 3. An oil return port 502 communicating with the groove 501 is provided on the side of the lower crankcase 2. The oil return port 502 extends toward the middle of the surface of the oil pan 3. A pressure cap 503 is embedded in the groove 501 with sealant. The lower crankcase 2 is fastened to the pressure cap 503 by locking bolts. A positioning hole 505 is opened on the surface of the groove 501, which passes through the lower crankcase 2. A heat-conducting column 504 passing through the positioning hole 505 is fixed on one side of the pressure cap 503. The heat-conducting column 504 is made of copper. The copper heat-conducting column 504 can quickly absorb the heat on the pressure cap 503.

[0022] In this embodiment, the heat-conducting column 504 on one side of the cover 503 is inserted from the groove 501 into the positioning hole 505, so that the cover 503 is positioned and aligned with the groove 501, and the sealant on one side of the cover 503 is pressed and bonded to the surface of the groove 501. Then, the locking bolt is rotated to connect with the cover 503 by thread, so that the cover 503 is completely embedded in the groove 501 to complete the sealing assembly. At the same time, the heat-conducting column 504 leading out of the lower crankcase 2 absorbs the heat on the surface of the cover 503, so that the heat is quickly transferred to the outside of the lower crankcase 2. During the motorcycle riding, the circulating air is used to quickly dissipate heat from the heat-conducting column 504.

[0023] Please see Figure 5 , Figure 8 and Figure 9The pressure cap 503 has an oil guide plate 506 connected to its middle part. The oil guide plate 506 is used to treat the sediment of the lubricating oil that flows outward. The oil guide plate 506 is pressed by the tight abutment between the pressure cap 503 and the groove 501. A partition plate 5061 is provided in the middle of the oil guide plate 506. An oil inlet chamber 5062 and an oil outlet groove 5063 are respectively opened on both sides of the oil guide plate 506 near the partition plate 5061. A semi-circular baffle is provided at the bottom of the partition plate 5061 near the oil return port 502. The semi-circular baffle divides the extended side of the oil return port 502 into two sections. The two sections of the oil return port 502 located on both sides of the semi-circular baffle are connected to the oil inlet chamber 5062 and the oil outlet groove 5063 respectively. The connecting end of the oil inlet chamber 5062 and the oil outlet groove 5063 is higher than the position of the oil return port 502. A sealing strip is provided at the bottom of the oil guide plate 506 and the semi-circular baffle.

[0024] In this embodiment, before assembling the pressure cap 503, the oil guide plate 506 is first connected to the pressure cap 503. Then, by locking the pressure cap 503 and the groove 501, the pressure cap 503 can be pressed against the oil guide plate 506. At this time, the oil guide plate 506 will block and separate the extension side of the oil return port 502 through the semi-circular baffle. With the oil inlet chamber 5062 and the oil outlet groove 5063 of the oil guide plate 506 connected, the lubricating oil in the oil pan 3 can flow sequentially along the oil return port 502 to the extension side of the oil pan 3, the oil inlet chamber 5062 and the oil outlet groove 5063. Finally, the lubricating oil flows from the outlet side of the oil return port 502 to the outside of the oil pan 3. Since the connecting end of the oil inlet chamber 5062 and the oil outlet groove 5063 is higher than the position of the oil return port 502, when the lubricating oil flows outward from the oil pan 3, it can be treated by the rising flow channel inside the oil guide plate 506 to remove sludge. At this time, the iron filings at the bottom of the oil pan 3 will not be discharged with the flowing lubricating oil under the magnetic attraction of the drain bolt. Furthermore, the oil inlet chamber 5062 and the oil outlet groove 5063 on both sides of the baffle plate 5061 create a flow deflection, which can smoothly guide the lubricating oil in the oil pan 3 from the oil guide plate 506 to the oil return port 502, preventing the oscillating lubricating oil in the oil pan 3 from carrying the floating iron filings outward.

[0025] Please see Figure 1 , Figure 2 , Figure 6 and Figure 7 A filter mechanism 6 is provided on the outer side of the lower crankcase 2 near the cover plate 4. The filter mechanism 6 includes a filter box 601 that is movably connected to the oil return port 502. The filter box 601 is used to draw the lubricating oil in the oil pan 3 outward. A hydraulic rod 609 is movably connected between the filter box 601 and the lower crankcase 2. The filter box 601 is rotated at an angle on one side of the oil return port 502 by the extension and retraction of the hydraulic rod 609.

[0026] In this embodiment, the lubricating oil discharged from the oil return port 502 is introduced into the filter collection box 601. When the hydraulic rod 609 is activated to produce a pushing and pulling effect, the hydraulic rod 609 will push or pull the filter collection box 601 through the telescopic front end, thereby enabling the filter collection box 601 to rotate at an angle on one side of the oil return port 502, thereby changing the placement angle of the filter collection box 601, and thus enabling the lubricating oil entering the filter collection box 601 to accumulate in a local position of the filter collection box 601.

[0027] Please see Figure 6 and Figures 10-12 An oil suction sleeve 603 is inserted into the side of the filter box 601 away from the lower crankcase 2. A plug 604 is integrally formed at the end of the oil suction sleeve 603 that extends out of the filter box 601. The plug 604 is threadedly connected to the filter box 601. A support plate is provided on one side of the plug 604. The plug 604 is limited and connected to the filter box 601 by a fastening screw 608. The threaded connection between the plug 604 and the filter box 601 facilitates the assembly and disassembly of the oil suction sleeve 603 and the filter box 601. At the same time, the plug 604 and the filter box 601 can also be sealed after being locked. The limited connection between the plug 604 and the filter box 601 by the fastening screw 608 can prevent the oil suction sleeve 603 from falling off the filter box 601. The surface of the oil suction sleeve 603 is provided with a V-shaped manifold 605 at equal angles. The side of the oil suction sleeve 603 near the manifold 605 is provided with a through hole 606 that communicates with the center of the oil suction sleeve 603. The side of the plug 604 is threaded with a coarse filter 607 that is sleeved on the outside of the oil suction sleeve 603. One end of the plug 604 is connected to a bend pipe. The bend pipe and the oil inlet side of the gear pump 401 are connected to each other through a rubber hose 8 for oil supply.

[0028] In this embodiment, when the gear pump 401 draws oil through the rubber hose 8, the lubricating oil in the filter box 601 flows to the coarse filter cylinder 607. At this time, the oil suction sleeve 603 produces a lubricating oil suction effect through the through hole 606 on one side of the manifold 605. Since the opening direction of the through hole 606 faces the other side of the manifold 605, the lubricating oil will first pass through the filter hole of the coarse filter cylinder 607 and then enter the manifold 605. After that, it will enter the center of the oil suction sleeve 603 along the through hole 606, thereby reducing the pressure of the local filter hole of the coarse filter cylinder 607 to filter impurities. By setting the manifold 605 at an equal angle, the oil suction sleeve 603 can produce different oil suction efficiencies for lubricating oil at different liquid levels. It should be noted that when the motorcycle engine drives the crankshaft body 201 to accelerate, the gear pump 401 on the cover plate 4 will also accelerate. At this time, the gear pump 401 will accelerate the extraction of lubricating oil. In order to cope with the operation of quickly extracting lubricating oil from the oil pan 3, the hydraulic rod 609 is extended to push the filter box 601 downward, so that the oil suction sleeve 603 of the filter box 601 can move down and away from the oil return port 502. At this time, the level of lubricating oil will first submerge the area of ​​the coarse filter cylinder 607, and the oil suction sleeve 603 will also draw lubricating oil through more through holes 606. After that, the lubricating oil can be circulated and delivered to various components through the secondary filtration of the fine filter element, thereby meeting the lubrication needs of various components inside the upper crankcase 1 and the lower crankcase 2.

[0029] Please see Figure 1 and Figures 5-7 The filter box 601 has a connecting port 602 on the side near the oil return port 502. A rotary joint 7 is connected between the oil return port 502 and the connecting port 602. The filter box 601 deflects around the axis of the rotary joint 7.

[0030] In this embodiment, by connecting the filter box 601 and the oil return port 502 through the rotary joint 7, the lubricating oil in the oil pan 3 can flow from the interface 602 into the filter box 601 outside the lower crankcase 2. When absorbing lubricating oil for circulation, directly drawing lubricating oil from the filter box 601 can reduce the machining size of the oil pan 3 and the overall size of the crankcase. It is not necessary to design the size of the oil pan 3 to be too large, which would affect the installation and operation of the motorcycle engine. This allows only the crankshaft body 201 to operate in the lower crankcase 2, and also allows for maintenance of the externally mounted primary filter lubricating oil filter box 601 without disassembling the lower crankcase 2 of the engine for maintenance. At the same time, by using the rotary joint 7 to rotate the filter box 601 at an angle, the rotation of the filter box 601 and the delivery of lubricating oil will not cause leakage.

[0031] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A crankcase for a motorcycle engine, comprising a sealed upper crankcase (1) and a lower crankcase (2), wherein an oil pan (3) is formed at the bottom of the lower crankcase (2), and a cover plate (4) is mounted on the sides of the upper crankcase (1) and the lower crankcase (2), and a gear pump (401) is mounted on the outer side of the cover plate (4); characterized in that: The lower crankcase (2) is provided with a flow guiding mechanism (5) on the side near the cover plate (4) for guiding the lubricating oil in the oil pan (3) to remove sediment. The flow guiding mechanism (5) includes a groove (501) opened on the inner wall of the lower crankcase (2). The side of the lower crankcase (2) is provided with an oil return port (502) communicating with the groove (501). A pressure cap (503) is embedded in the groove (501) with sealant. An oil guide plate (506) is connected to the middle of the pressure cap (503). The lubricating oil that is guided to the outside through the oil guide plate (506) is treated to remove sediment. The lower crankcase (2) is provided with a slag filter mechanism (6) on the outer side near the cover plate (4). The slag filter mechanism (6) includes a filter box (601) movably connected to the oil return port (502). The filter box (601) is used to draw the lubricating oil in the oil pan (3) outward.

2. The crankcase of a motorcycle engine according to claim 1, characterized in that: The upper crankcase (1) has a cylinder installed on its outer top surface for the reciprocating motion of the piston. The lower crankcase (2) has a crankshaft body (201) connected to its interior by a bearing. The crankshaft body (201) is connected to the piston sliding in the cylinder by a crank connecting rod. One of the gear ends of the gear pump (401) is connected to one end of the crankshaft body (201), and the rotating crankshaft body (201) drives the gear pump (401) to operate.

3. The crankcase of a motorcycle engine according to claim 1, characterized in that: The lower edge of the groove (501) is aligned with the surface of the oil pan (3), and the oil return port (502) extends toward the center of the surface of the oil pan (3).

4. A motorcycle engine crankcase according to claim 3, characterized in that: The lower crankcase (2) is fastened to the cover (503) by locking bolts. The surface of the groove (501) is provided with a positioning hole (505) that passes through the lower crankcase (2). A heat-conducting column (504) passing through the positioning hole (505) is fixed on one side of the cover (503). The heat-conducting column (504) leading out of the lower crankcase (2) absorbs the heat on the surface of the cover (503) so that the heat is quickly transferred to the outside of the lower crankcase (2).

5. A motorcycle engine crankcase according to claim 1, characterized in that: The oil guide plate (506) is provided with a partition plate (5061) in the middle. The oil guide plate (506) is provided with an oil inlet chamber (5062) and an oil outlet groove (5063) on both sides near the partition plate (5061). A semi-circular baffle is provided at the bottom of the partition plate (5061) near the oil return port (502). The semi-circular baffle divides the extended side of the oil return port (502) into two sections. The two oil return ports (502) located on both sides of the semi-circular baffle are connected to the oil inlet chamber (5062) and the oil outlet groove (5063) respectively. The connecting end of the oil inlet chamber (5062) and the oil outlet groove (5063) is higher than the position of the oil return port (502). The bottom of the oil guide plate (506) and the semi-circular baffle is provided with a sealing strip.

6. A motorcycle engine crankcase according to claim 1, characterized in that: A hydraulic rod (609) is movably connected between the filter box (601) and the lower crankcase (2). The filter box (601) is rotated at an angle on one side of the oil return port (502) by the extension and retraction of the hydraulic rod (609).

7. A motorcycle engine crankcase according to claim 6, characterized in that: The filter box (601) has a connecting port (602) on the side near the oil return port (502). A rotary joint (7) is connected between the oil return port (502) and the connecting port (602). The filter box (601) deflects around the axis of the rotary joint (7).

8. A motorcycle engine crankcase according to claim 7, characterized in that: An oil suction sleeve (603) is inserted into the side of the filter box (601) away from the lower crankcase (2). The end of the oil suction sleeve (603) extending out of the filter box (601) is integrally formed with a plug (604). The plug (604) is threadedly connected to the filter box (601). A support plate is provided on one side of the plug (604). The plug (604) is limited and connected to the filter box (601) by a fastening screw (608).

9. A motorcycle engine crankcase according to claim 8, characterized in that: The surface of the oil suction sleeve (603) is provided with a V-shaped manifold (605) at equal included angles, and a through hole (606) communicating with the center of the oil suction sleeve (603) is provided on the side of the oil suction sleeve (603) near the manifold (605).

10. A motorcycle engine crankcase according to claim 9, characterized in that: The plug (604) is threaded to one side with a coarse filter (607) sleeved on the outside of the oil suction sleeve (603). One end of the plug (604) is connected to a bend pipe, and the bend pipe and the oil inlet side of the gear pump (401) are connected to each other through a rubber hose (8) for oil transfer.

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