Oil pump and motorcycle

Abstract

The application relates to an oil pump and a motorcycle, wherein the pump shell comprises a first shell and a second shell which are detachably installed on the outer wall of an engine; a pump shaft is rotatably arranged on the first shell and the second shell and is movably connected with the output end of the engine; the second shell is arranged on the outer wall of the first shell on one side along a first direction; the first shell and the second shell are both internally provided with shaft holes which penetrate through along the first direction, and the pump shaft is rotatably arranged in the shaft holes; the outer wall of the second shell is provided with a shaft seat which protrudes along the first direction; an oil storage groove which faces the direction of gravity is arranged on the inner wall of the shaft hole on the second shell and penetrates through the outer wall of the shaft seat along the first direction; and the communication part of the oil storage groove and the outer wall of the shaft seat forms a gap. The application adds the oil storage groove in the shaft hole of the shell; when the second sprocket rotates at high speed, the splashed lubricating oil is converged to the groove and the seepage gap through the oil blocking rib; the lubricating oil is guided into the oil storage groove through the gap; and the lubricating oil stored in the groove realizes lubrication when the pump shaft rotates.

Description

Technical Field

[0001] This application relates to the field of motorcycle technology, and in particular to an oil pump and a motorcycle. Background Technology

[0002] The engine is the heart of a motorcycle, responsible for generating power, while the oil pump is the engine's "blood pump," responsible for delivering oil to lubricate the engine. The two are interdependent, forming a vital link between power and lubrication. The oil pump itself has no power source; it is typically connected to the engine's crankshaft and camshaft via gears or a chain, and is driven synchronously by the engine to circulate the oil. Essentially a miniature oil pump, its core function is to circulate and deliver oil, protecting the engine's normal operation. The oil pump forces oil onto the surfaces of high-speed friction components such as gears, pistons, and the crankshaft within the engine, reducing wear. Furthermore, the circulating oil carries away heat generated by friction, helping to cool the engine. In addition, the oil absorbs metal shavings, dust, and other impurities within the engine, which are then filtered through an oil filter to maintain internal cleanliness.

[0003] In the current structure, the oil pump shaft is tightly fitted to the housing, and the sprocket drives the oil pump shaft to rotate at high speed under chain drive. However, this drive structure has a significant lubrication blind spot. Because the sprocket is a disc-shaped structure, its installation position directly covers the mating end face between the oil pump shaft and the housing bore, forming a physical obstruction. When the oil pump is working, the lubricating oil in the system mainly relies on the low-pressure return oil delivered by the oil pump itself or splash lubrication. Due to the obstruction of the sprocket, it cannot enter the tiny mating gap between the shaft and the housing bore through natural flow or splashing. Even if a small amount of oil comes into contact with the periphery of the sprocket, it will be thrown outward by the high-speed rotating sprocket, making it difficult to penetrate to the core friction parts. Utility Model Content

[0004] Therefore, it is necessary to provide an oil pump that addresses the problem that currently, the oil pump shaft and housing are tightly fitted together, and because the rotating parts are blocked by the sprocket, it is difficult for lubricating oil to enter the friction area between the oil pump shaft and the housing hole, which will cause dry friction and damage to the aluminum pump housing hole.

[0005] According to one aspect of this application, an oil pump is provided for a motorcycle, the motorcycle including an engine, the oil pump comprising: a pump housing including a first housing and a second housing, detachably mounted on the outer wall of the engine; the second housing disposed on the outer wall of the first housing along a first direction; both the first housing and the second housing having a through-hole along the first direction; a pump shaft rotatably disposed on the first housing and the second housing, and movably connected to the output end of the engine; the pump shaft rotatably disposed within the through-hole;

[0006] The second housing has a bearing seat protruding along a first direction on its outer wall. An oil storage groove facing the direction of gravity is opened on the inner wall of the shaft hole on the second housing. The oil storage groove penetrates the outer wall of the bearing seat along the first direction, and a notch is formed at the connection between the oil storage groove and the outer wall of the bearing seat.

[0007] The first direction is perpendicular to the direction of gravity and parallel to the axial direction of the pump shaft.

[0008] In one embodiment, the oil pump includes a first sprocket, and a mounting groove is provided on the outer wall of the pump shaft on the side away from the first housing, and the first sprocket is fixedly installed in the mounting groove.

[0009] In one embodiment, the engine includes an engine body, a crankshaft rotatably mounted on the engine body, a second sprocket mounted on the crankshaft, a chain mounted on the second sprocket, and a first sprocket movably connected to the chain; the second sprocket drives the first sprocket to rotate via the chain.

[0010] In one embodiment, the inner wall of the mounting groove includes a limiting wall perpendicular to a first direction, the limiting wall having a height difference with the shaft seat in the first direction, and the limiting wall being used to fit and limit the first sprocket; the side of the first sprocket facing the second housing forms a seepage gap with the side of the shaft seat away from the first housing in the first direction.

[0011] In one embodiment, the oil pump includes a plug, and the pump shaft has an axially formed locking cavity inside, the plug being inserted into the locking cavity and limiting the first sprocket in a first direction.

[0012] In one embodiment, the oil pump includes a gasket, the insert includes a rod and a limiting portion, and the gasket is sleeved on the rod and located between the limiting portion and the first sprocket.

[0013] In one embodiment, an oil baffle is provided on the outer wall of the second housing. One end of the oil baffle is located on the side of the second sprocket facing the direction of gravity, and the other end of the oil baffle is connected to the bearing seat. An oil flow path is formed between the side of the oil baffle away from the direction of gravity and the second housing.

[0014] In one embodiment, a groove is further provided on the radial outer wall of the bearing seat, the groove penetrating the axial outer wall of the bearing seat along a first direction; the groove is connected to the flow guide path.

[0015] In one embodiment, the oil pump includes a plurality of locking members, which are inserted into the first housing and the second housing, and are all fixedly disposed on the outer wall of the engine; the pump housing is detachably mounted on the engine body through the plurality of locking members.

[0016] This application has the following beneficial effects:

[0017] In the oil pump of this application, an active lubrication guarantee mechanism can be constructed by adding an oil reservoir inside the shaft hole of the housing, fundamentally solving the risk of dry friction. This design is not a simple structural addition, but a system optimization scheme based on fluid mechanics and material properties. The oil reservoir does not exist in isolation, but forms a closed loop with the overall lubrication system of the oil pump. When the second sprocket rotates at high speed, the splashed lubricating oil flows through the oil baffle ribs into the groove and seepage gap, and the lubricating oil is finally introduced into the oil reservoir through the notch. The lubricating oil stored in the reservoir forms a miniature oil reservoir, which lubricates the pump shaft when it rotates. Attached Figure Description

[0018] Figure 1 The overall three-dimensional structure of an embodiment of this application Figure 1 .

[0019] Figure 2 The overall three-dimensional structure of an embodiment of this application Figure 2 .

[0020] Figure 3 This is an overall cross-sectional view of an embodiment of this application.

[0021] Figure 4 for Figure 3 Enlarged view of the structure at point A in the middle.

[0022] Figure 5 This is a three-dimensional structural diagram of the oil pump in one embodiment of this application.

[0023] Figure 6 A cross-sectional view of the second housing in one embodiment of this application. Figure 1 .

[0024] Figure 7 A cross-sectional view of the second housing in one embodiment of this application. Figure 2 .

[0025] Explanation of reference numerals in the attached figures:

[0026] 1. Engine body; 101. Crankshaft; 102. Second sprocket; 103. Chain;

[0027] 2. Pump housing; 201. First housing; 202. Second housing; 203. Shaft hole; 204. Pump shaft; 205. First sprocket; 206. Oil reservoir; 207. Notch; 208. Shaft seat; 209. Oil baffle; 210. Flow guide path; 211. Groove; 212. Seepage gap; 213. Locking cavity; 214. Insert; 2141. Limiting part; 215. Gasket; 216. Mounting groove; 217. Limiting wall;

[0028] First direction X. Detailed Implementation

[0029] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0030] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0031] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0032] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0033] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0034] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0035] See appendix Figure 1 - Appendix Figure 7 , attached Figure 1 and attached Figure 2 The diagram shows an overall structural schematic of an oil pump according to an embodiment of this application, used in a motorcycle. The motorcycle includes an engine, and the oil pump includes: a pump housing 2, including a first housing 201 and a second housing 202, which is detachably mounted on the outer wall of the engine; and a pump shaft 204, which is rotatably mounted on the first housing 201 and the second housing 202 and is movably connected to the output end of the engine.

[0036] The second housing 202 is disposed on the outer wall of the first housing 201 along the first direction; both the first housing 201 and the second housing 202 have shaft holes 203 extending along the first direction, and the pump shaft 204 is rotatably disposed in the shaft holes 203; the outer wall of the second housing 202 is provided with a shaft seat 208 protruding along the first direction, and an oil storage groove 206 facing the gravity direction is provided on the inner wall of the shaft hole 203 on the second housing 202. The oil storage groove 206 extends through the outer wall of the shaft seat 208 along the first direction, and a notch 207 is formed at the connection between the oil storage groove 206 and the outer wall of the shaft seat 208; the first direction is perpendicular to the gravity direction and parallel to the axial direction of the pump shaft 204.

[0037] During operation, the second housing 202 of the oil pump features an integrally formed bearing seat 208 protruding along the first direction X on its outer wall. The internal shaft hole 203 provides rotational guidance for the pump shaft 204, ensuring radial stability during high-speed operation. An oil reservoir 206 is specially machined into the inner wall of the shaft hole 203 on the second housing 202, designed to naturally collect lubricating oil using gravity. The oil reservoir 206 is not a partial recess but extends axially through the outer wall of the bearing seat 208 along the first direction X, forming a long, narrow oil groove extending to the end of the bearing seat 208, capable of storing a certain amount of lubricating oil. A notch 207 is formed at the connection between the oil reservoir 206 and the outer wall of the bearing seat 208. This notch 207 is the port through which the oil reservoir 206 opens to the outer wall of the bearing seat 208, and its edges are rounded to avoid sharp corners obstructing the flow of lubricating oil. The notch 207 forms a transfer channel for the lubricating oil.

[0038] When the engine is running, the lubricating oil splashed from the sprocket, guided by the oil baffle 209, flows into the oil reservoir 206 through the notch 207. The lubricating oil stored in the reservoir can continuously permeate into the gap of the pump shaft 204 as the pump shaft rotates, providing rapid lubrication. The oil reservoir 206 has a length of approximately 5-8 mm, preferably 6 mm; a width of approximately 3-5 mm, preferably 4.4 mm; and a depth of 0.3-0.6 mm, preferably 0.5 mm.

[0039] See appendix Figure 3 - Appendix Figure 4 The oil pump includes a first sprocket 205. An installation groove 216 is provided on the outer wall of the pump shaft 204 on the side away from the first housing 201. The first sprocket 205 is fixedly installed in the installation groove 216.

[0040] In some embodiments, the depth of the mounting groove 216 and the distance from the end of the pump shaft 204 are also optimized to ensure that after the first sprocket 205 is installed, its tooth end face is parallel to the tooth end face of the second sprocket 102 on the engine side, and the tension direction of the chain 103 is consistent with the center line connecting the two sprockets, so as to avoid abnormal wear or chain derailment risk caused by the chain 103 being misaligned.

[0041] See appendix Figure 1 - Appendix Figure 2 The engine includes an engine body 1, a crankshaft 101 rotatably mounted on the engine body 1, a second sprocket 102 mounted on the crankshaft 101, a chain 103 mounted on the second sprocket 102, and a first sprocket 205 movably connected to the chain 103; the second sprocket 102 drives the first sprocket 205 to rotate through the chain 103.

[0042] In some embodiments, the crankshaft 101 is a key carrier for engine power output in the engine's power transmission system. To transmit power to the oil pump, a second sprocket 102 is fixedly mounted on the crankshaft 101 via a key connection or interference fit, ensuring that the rotational torque of the crankshaft 101 can be fully transmitted to the second sprocket 102. The number and tooth profile of the second sprocket 102 are precisely designed to match the subsequent chain 103 and the first sprocket 205 to ensure smooth transmission and efficiency.

[0043] In some embodiments, the chain 103 serves as a flexible transmission component, fitted onto the teeth of the second sprocket 102, and power transmission is achieved through the meshing of the teeth with the chain rollers. In actual assembly, the tension of the chain 103 needs to be adjusted by the tensioning wheel or adjusting the position of the adjustment component. If it is too loose, it will easily cause the chain to skip teeth or derail, while if it is too tight, it will increase the wear of the sprocket and the chain, shortening its service life.

[0044] In some embodiments, when the crankshaft 101 drives the second sprocket 102 to rotate, the teeth of the second sprocket 102 push the chain 101 to move, thereby driving the first sprocket 205 to rotate synchronously. At this time, the first sprocket 205 is rigidly connected to the pump shaft 204 of the oil pump through the insert 214, which can transmit the rotational torque to the pump shaft 204, drive the pump shaft 204 to drive the rotor or gear inside the oil pump to rotate, and finally realize the pressurization and circulation of oil to provide lubrication for the various friction parts of the engine.

[0045] See appendix Figure 3 - Appendix Figure 4 The inner wall of the mounting groove 216 includes a limiting wall 217 perpendicular to the first direction. The limiting wall 217 and the bearing seat 208 have a height difference in the first direction, and the limiting wall 217 is used to fit and limit the first sprocket 205. The side of the first sprocket 205 facing the second housing 202 and the side of the bearing seat 208 away from the first housing 201 form a seepage gap 212 in the first direction.

[0046] In some embodiments, in the housing structure of the oil pump, the mounting groove 216 is a key area for accommodating and positioning the first sprocket 205. Its inner wall is designed with a limiting wall 217 perpendicular to the first direction, serving as an axial positioning reference for the first sprocket 205. There is a specific height difference between the limiting wall 217 and the bearing seat 208 in the first direction. Specifically, if the end face of the bearing seat 208 near the first sprocket 205 is taken as a reference, the limiting wall 217 will be offset by a certain distance in the direction closer to the first sprocket 205, typically 0.5-1.5mm. This dimensional difference ensures the installation space for the first sprocket 205 and also reserves a structural foundation for the subsequent formation of the seepage gap.

[0047] In some embodiments, after the first sprocket 205 is assembled, its end facing the inside of the mounting groove 216 will fit tightly against the limiting wall 217, achieving axial limiting through the rigid support of the limiting wall 217. This prevents the first sprocket 205 from moving excessively into the mounting groove 216, ensuring accurate meshing between the sprocket and the chain. Furthermore, it forms a bidirectional constraint with the limiting part 2141 of the insert 214, stably clamping the first sprocket 205 in the middle, preventing axial movement during high-speed rotation, and reducing transmission noise and wear risk.

[0048] The formation of the seepage gap 212 is directly related to the aforementioned height difference design. Although this gap is small, it plays an important role in the lubrication system. When the first sprocket 205 rotates at high speed, its surface will adhere to and splash the lubricating oil in the engine compartment. Some of the lubricating oil will flow into the interior of the bearing seat 208 through the seepage gap 212.

[0049] See appendix Figure 3 - Appendix Figure 4 The oil pump includes a plug 214. The pump shaft 204 has a locking cavity 213 axially formed inside. The plug 214 is inserted into the locking cavity 213 and limits the first sprocket 205 in the first direction.

[0050] In some embodiments, in the transmission connection system of the oil pump, the cooperation between the plug 214 and the pump shaft 204 is a key structure for realizing power transmission and component detachability. As the core rotating component of the oil pump, the pump shaft 204 has a locking cavity 213 machined axially inside. This cavity is typically a blind hole with a keyway or irregular cross-section, and the inner wall may be provided with threads or positioning protrusions. Its cross-sectional shape is precisely matched with the insertion rod portion of the precise plug 214 to ensure that the plug can form a circumferential fixation after insertion.

[0051] The insert rod portion of the plug 214 is inserted axially into the locking cavity 213 of the pump shaft 204. Through their irregular fit, such as key and keyway engagement or interference fit, circumferential fixation is achieved, allowing the plug 214 to rotate synchronously with the pump shaft 204, ensuring power is transmitted from the pump shaft to the plug. Simultaneously, the limiting portion 2141 of the plug 214 abuts against the gasket 215 and the axial end face of the pump shaft 204, forming axial positioning.

[0052] In some embodiments, this structural design allows for the detachable installation of the first sprocket 205. When maintenance or replacement of the first sprocket 205 is required, simply release the insert 214 to remove the first sprocket 205 axially, without disassembling the pump shaft 204 or the oil pump body. Installation is performed in reverse; the sprocket is positioned by the limiting part 2141 of the insert 214 and then relocked. This design not only simplifies the sprocket maintenance process but also improves the versatility and ease of maintenance of the oil pump.

[0053] See appendix Figure 3 - Appendix Figure 4 The oil pump includes a gasket 215, and the plug 214 includes a plug rod and a limiting part 2141. The gasket 215 is sleeved on the plug rod and located between the limiting part 2141 and the first sprocket 205.

[0054] In some embodiments, in the transmission connection structure of the oil pump, the insert 21 is the core connecting component that realizes the rigid connection between the first sprocket 205 and the pump shaft 204. It has a stepped structure and consists of two parts: a rod for inserting into the corresponding locking cavity 213, and a limiting part 2141 integrally formed with one end of the rod. The diameter of the limiting part 2141 is larger than that of the rod, serving as an axial limiting function. The gasket 215, as an auxiliary sealing and buffering component, is typically made of elastic metal, such as copper gaskets, galvanized steel gaskets, or oil-resistant rubber. It has an annular thin sheet structure with a through hole in the center matching the diameter of the insert rod of the insert 214, ensuring a tight fit on the rod.

[0055] During installation, the plug 214, washer 215 and first sprocket 205 are axially fixed by the fixing structure at the end of the plug rod, including but not limited to the nut tightening and pin locking structure, to form a complete transmission assembly, thereby ensuring that power can be stably transmitted to the first sprocket 205 through the plug 214.

[0056] See appendix Figure 2 and attached Figure 5 An oil baffle 209 is provided on the outer wall of the second housing 202. One end of the oil baffle 209 is located on the side of the second sprocket 102 facing the direction of gravity, and the other end of the oil baffle 209 is connected to the bearing seat 208. An oil guide path 210 is formed between the side of the oil baffle 209 away from the direction of gravity and the second housing 202.

[0057] In some embodiments, the outer wall of the second housing 202 of the oil pump is specially integrated with an oil baffle 209, and it is integrally molded with the second housing 202 to ensure structural strength and sealing. From a positional perspective, the two ends of the oil baffle 209 have clear functional orientations. One end is precisely positioned on the side of the second sprocket 102 facing the direction of gravity. This is because when the second sprocket 102 rotates at high speed, it throws the lubricating oil in the engine compartment to all sides. Under the influence of gravity, most of the splashed lubricating oil will naturally diffuse downwards. This end of the oil baffle 209 is positioned here to intercept the downward-flowing lubricating oil to the greatest extent, reducing lubricating oil loss. The other end is tightly connected to the bearing seat 208, ensuring that the lubricating oil guided by the oil baffle 209 can flow smoothly to the bearing seat 208 area.

[0058] In some embodiments, the oil baffle 209 structurally forms a unique oil guiding path 210. Between the side of the oil baffle 209 facing away from the direction of gravity and the outer wall of the second housing 202, a narrow channel with a U-shaped or V-shaped cross-section is formed by the protrusion height of the oil baffle 209 and the arc-shaped contour of the outer wall of the housing. This channel is the oil guiding path 210. This path design makes full use of structural space, neither occupying the core assembly area inside the second housing 202, nor hindering the directional delivery of lubricating oil through the dual constraints of the oil baffle 209 and the outer wall of the housing.

[0059] In some embodiments, the cross-sectional dimensions of the flow path 210 are also precisely optimized, typically with a width of 3-7 mm and a depth of 2-6 mm. This dimension ensures that enough lubricating oil passes through per unit time to meet lubrication requirements, while avoiding excessively wide channels that cause slow lubricating oil flow or excessively narrow channels that cause blockage by impurities, thus balancing lubrication efficiency and reliability.

[0060] See appendix Figure 5 The bearing seat 208 is also provided with a groove 211 on its radial outer wall. The groove 211 penetrates the axial outer wall of the bearing seat 208 along the first direction. The groove 211 is connected to the flow path 210.

[0061] In some embodiments, in the structural design of the pump housing 2, a groove 211 is machined on the radial outer wall of the bearing seat 208. This groove is not a partial depression, but rather completely penetrates the axial outer wall of the bearing seat 208 along the first direction X, forming a through-type temporary lubricating oil storage cavity. At the same time, the inner sidewall of the groove 211 is precisely connected to the pre-set flow path 210 on the outer wall of the oil pump, ensuring that the lubricating oil in the flow path 210 can smoothly enter the groove 211 and be directionally delivered to the space between the first sprocket 205 requiring lubrication and the bearing seat 208, that is, the seepage gap 212.

[0062] In this application, the core objective is to efficiently utilize the splashed lubricating oil generated by the rotation of the engine sprocket. When the engine is running, the second sprocket 102, connected to the crankshaft 101, rotates at high speed. During this rotation, the second sprocket 102 causes some of the lubricating oil to splash outwards. An oil-blocking rib 209 is provided on the outer wall of the second housing 202. The oil-blocking rib 209 is a raised rib structure whose function is to intercept and collect the splashed lubricating oil, preventing its irregular diffusion and loss. Simultaneously, through its tilt angle or arc-shaped contour, it guides the lubricating oil to flow along the surface of the oil-blocking rib 209.

[0063] In some embodiments, under the influence of gravity, the lubricating oil guided by the oil-blocking rib 209 will naturally drip or flow downwards, eventually collecting precisely on the radial outer wall of the bearing seat 208. At this time, the groove 211 on the bearing seat 208 plays a crucial role as an oil guiding channel. The lubricating oil collected on the outer wall of the bearing seat 208 will flow rapidly along the through path of the groove 211 towards the end of the bearing seat 208 near the first sprocket 205. Subsequently, under the influence of gravity, the lubricating oil is further transported to the seepage gap 212, thereby forming effective lubrication and cooling, thus solving the lubrication blind spot problem previously caused by the first sprocket 205 blocking the lubrication, and avoiding failure caused by dry friction.

[0064] In some embodiments, the width of the groove 211 is typically controlled at 3-8 mm and the depth at 2-5 mm, which ensures sufficient lubricant capacity to guarantee continuous and stable lubrication, while preventing the structural strength of the bearing seat 208 from decreasing due to excessively large grooves 211, thus balancing lubrication function and structural reliability.

[0065] See appendix Figure 2 - Appendix Figure 3 The oil pump includes multiple locking components, which are inserted into the first housing 201 and the second housing 202. All locking components are fixedly mounted on the outer wall of the engine. The pump housing 2 is detachably mounted on the engine body 1 through the multiple locking components.

[0066] In some embodiments, the pump housing 2 of the oil pump adopts a split design, consisting of a first housing 201 and a second housing 202 joined together by locking components, which together form the receiving cavity of the oil pump. In this application, the locking components include, but are not limited to, bolts, screws, and other structures; the specific structure is not limited herein.

[0067] In terms of the type of locking component, high-strength bolts or locating pins are typically selected. These locking components must meet the vibration environment requirements during engine operation to prevent loosening during long-term operation. Regarding the installation position, the locking component must penetrate through both the first housing 201 and the second housing 202; that is, corresponding positions in the first housing 201 and the second housing 202 will have pre-set coaxial mounting holes. After the rod of the locking component passes through the mounting holes in the first housing 201 and the second housing 202 in sequence, its end is fixed to a pre-set interface on the outer wall of the engine body 1 via a threaded connection or interference fit.

[0068] In some embodiments, the pump housing 2 is detachably installed to the engine body 1 via multiple locking components. When the oil pump needs repair or maintenance, all locking components can be removed to separate the pump housing 2 entirely from the engine body 1 without disassembling the engine body structure, significantly reducing the difficulty and time required for maintenance. After maintenance, the locking components are reassembled and tightened to restore the connection between the oil pump and the engine, ensuring installation accuracy and operational stability.

[0069] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0070] The above embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. An oil pump for a motorcycle, said motorcycle including an engine, characterized in that, The oil pump includes: The pump housing (2) includes a first housing (201) and a second housing (202), which can be detachably installed on the outer wall of the engine; the second housing (202) is disposed on the outer wall of the first housing (201) along the first direction; the first housing (201) and the second housing (202) are both provided with shaft holes (203) that pass through along the first direction. The pump shaft (204) is rotatably mounted on the first housing (201) and the second housing (202), and is movably connected to the output end of the engine; the pump shaft (204) is rotatably mounted in the shaft hole (203); The second housing (202) has a bearing seat (208) protruding along a first direction on its outer wall. An oil storage groove (206) facing the direction of gravity is opened on the inner wall of the shaft hole (203) on the second housing (202). The oil storage groove (206) penetrates the outer wall of the bearing seat (208) along the first direction. A notch (207) is formed at the connection between the oil storage groove (206) and the outer wall of the bearing seat (208). The first direction is perpendicular to the direction of gravity and parallel to the axial direction of the pump shaft (204).

2. The oil pump according to claim 1, characterized in that, The oil pump includes a first sprocket (205), and an installation groove (216) is provided on the outer wall of the pump shaft (204) on the side away from the first housing (201), and the first sprocket (205) is fixedly installed in the installation groove (216).

3. The oil pump according to claim 2, characterized in that, The engine includes an engine body (1), a crankshaft (101) is rotatably mounted on the engine body (1), a second sprocket (102) is mounted on the crankshaft (101), a chain (103) is mounted on the second sprocket (102), and the first sprocket (205) is movably connected to the chain (103); The second sprocket (102) drives the first sprocket (205) to rotate via the chain (103).

4. The oil pump according to any one of claims 1-3, characterized in that, The inner wall of the mounting groove (216) includes a limiting wall (217) perpendicular to the first direction. The limiting wall (217) and the bearing seat (208) have a height difference in the first direction, and the limiting wall (217) is used to fit and limit the first sprocket (205). And / or, the first sprocket (205) facing the second housing (202) and the bearing seat (208) away from the first housing (201) form a seepage gap (212) in a first direction.

5. The oil pump according to any one of claims 1-3, characterized in that, The oil pump includes a plug (214), and the pump shaft (204) has a locking cavity (213) axially formed inside. The plug (214) is inserted into the locking cavity (213) and limits the first sprocket (205) in the first direction.

6. The oil pump according to claim 5, characterized in that, The oil pump includes a gasket (215), and the insert (214) includes a rod and a limiting part (2141). The gasket (215) is sleeved on the rod and located between the limiting part (2141) and the first sprocket (205).

7. The oil pump according to any one of claims 1-3, characterized in that, An oil baffle rib (209) is provided on the outer wall of the second housing (202). One end of the oil baffle rib (209) is located on the side of the second sprocket (102) facing the direction of gravity, and the other end of the oil baffle rib (209) is connected to the bearing seat (208). The oil baffle (209) forms an oil flow path (210) between the side facing away from the direction of gravity and the second housing (202).

8. The oil pump according to claim 7, characterized in that, The bearing seat (208) is also provided with a groove (211) on its radial outer wall. The groove (211) penetrates the axial outer wall of the bearing seat (208) along the first direction. The groove (211) is connected to the flow path (210).

9. The oil pump according to any one of claims 1-3, characterized in that, The oil pump includes multiple locking components, which are inserted into the first housing (201) and the second housing (202), and are all fixedly mounted on the outer wall of the engine. The pump housing (2) is detachably mounted on the engine body (1) by means of a plurality of the locking elements.

10. A motorcycle, characterized in that, The oil pump includes any one of claims 1-9.

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