Lubrication structure, engine and motorcycle

Abstract

The present invention relates to the technical field of motorcycles, and discloses a lubrication structure, an engine, and a motorcycle. The lubrication mechanism includes a cylinder head and an oil pump. A predetermined oil passage for the flow of lubricating oil is provided inside the cylinder head, and the oil pump can drive the lubricating oil to flow in the predetermined oil passage. A recessed portion is formed by the surface depression of the cylinder head, and an oil outlet communicating with the predetermined oil passage is provided on the inner wall of the recessed portion. A raised portion with a tip is formed by the surface elevation of the cylinder head, and an oil collecting groove extending to the tip is provided on the side surface of the raised portion. A oil guiding groove is formed by the inner wall depression of the recessed portion, and the oil collecting groove is communicated with the oil outlet through the oil guiding groove. When the lubrication structure of the present invention is applied when the engine is in a low-speed operation state, it can still achieve a good lubrication effect on the engine, and avoid the wear of the components of the valve train when the engine is in low-speed operation.

Description

Technical Field

[0001] The present invention relates to the technical field of motorcycles, and in particular to a lubrication structure, an engine and a motorcycle. Background Art

[0002] When a motorcycle engine is in operation, there needs to be sufficient lubrication between the various moving parts of the valve system and the various mating parts of the transmission system to ensure that the engine can operate with low friction and high efficiency under various working conditions.

[0003] The lubrication methods for internal engine parts usually include: pressure oil supply lubrication, parts oil stirring splash lubrication, ribs and bosses collecting lubricating oil dripping lubrication and other methods.

[0004] However, existing lubrication methods for internal engine parts have drawbacks.

[0005] The pressure oil supply method requires the processing of multiple predetermined oil circuits on the parts, a large number of processing holes, and high processing costs.

[0006] The method of splash lubrication by stirring oil for parts and drip lubrication by collecting lubricating oil on ribs and bosses requires the engine to reach a higher speed. When the engine is running at a low speed, the lubricating oil is difficult to be driven to form a splashing state, making it difficult for the ribs and bosses to collect enough lubricating oil to lubricate the corresponding parts. Summary of the invention

[0007] The purpose of the present invention is to provide a lubricating structure which has low processing cost and can lubricate the parts to be lubricated when the engine is running at a low speed, an engine having the lubricating structure, and a motorcycle having the engine.

[0008] In order to achieve the above-mentioned purpose, the first aspect of the present invention provides a lubrication structure, including a crankcase body, a cylinder block, a cylinder head, a cylinder cover, and an oil pump; the cylinder head and the cylinder head are enclosed to form an accommodating space for accommodating the valve distribution system, the cylinder head has a predetermined oil path for the flow of lubricating oil, and the oil pump can drive the lubricating oil to flow in the predetermined oil path; the crankcase body is provided with an oil storage part, and the crankcase body, the cylinder block, the cylinder head, and the cylinder head are provided with a first lubricating oil path that is connected in sequence, and the lubricating oil in the oil storage part is sequentially transported through the lubricating oil filter device, An oil pump, lubricating oil is sequentially delivered from the crankcase body, the cylinder block, and the cylinder head to the cylinder head, and the valve train in the accommodating space is lubricated; the first lubricating oil circuit includes the predetermined oil circuit; the surface of the cylinder head is concave to form a concave portion, and the inner wall of the concave portion is provided with an oil outlet connected to the predetermined oil circuit; the surface of the cylinder head is raised to form a raised portion with a pointed end, and the side surface of the raised portion is provided with an oil collecting groove extending to the pointed end; the inner wall of the recessed portion is recessed to form an oil guide groove, and the oil collecting groove is connected to the oil outlet through the oil guide groove.

[0009] Furthermore, there are multiple protrusions, and multiple oil guide grooves, and the multiple oil guide grooves correspond to the multiple protrusions one by one, and the oil collecting grooves of each protrusion are connected to the oil outlet through the corresponding oil guide groove.

[0010] Furthermore, the plurality of oil guide grooves are sequentially arranged in a circle on the outside of the oil outlet; the oil outlet comprises a plurality of predetermined arcuate edges, the plurality of predetermined arcuate edges respectively correspond to the plurality of oil guide grooves one by one, each of the predetermined arcuate edges is respectively located in the corresponding oil guide groove, and the plurality of predetermined arcuate edges are connected end to end.

[0011] Furthermore, the cylinder head includes an upper wall portion and a side wall surrounding the edge of the upper wall portion, and the upper wall portion and the side wall together form a first concave cavity; the recessed portion is formed on the upper wall portion in the first concave cavity, and the raised portion is formed on the upper wall portion in the first concave cavity.

[0012] Furthermore, the predetermined oil circuit includes a first sub-oil circuit and a second sub-oil circuit; the first sub-oil circuit is arranged in the side wall and has an oil inlet opened on the end surface of the side wall, and the first sub-oil circuit is connected with the accommodating space through the oil inlet; the second sub-oil circuit is arranged in the upper wall portion, and the oil outlet is connected with the second sub-oil circuit.

[0013] Furthermore, the cylinder head cover further comprises a boss disposed on the upper wall portion in the first cavity, the recessed portion is formed on an end surface of the boss, and the raised portion is formed on the end surface of the boss.

[0014] Furthermore, the upper wall portion in the first cavity is a plane, and the boss is arranged inclined relative to the upper wall portion in the first cavity.

[0015] Further, in the cross section of the oil guiding groove, the inner wall of the oil guiding groove is arc-shaped; in the cross section of the oil collecting groove, the inner wall of the oil collecting groove is arc-shaped.

[0016] Compared with the prior art, the lubrication structure of the embodiment of the present invention has the following beneficial effects:

[0017] First, the lubrication structure of this embodiment is applied when the engine is running at a low speed, and can still provide good lubrication effect to the engine, thereby preventing the wear of components when the engine is running at a low speed.

[0018] Second, the lubrication structure of the embodiment of the present invention is provided with a raised portion, an oil collecting groove and an oil guide groove, which can solve the problem of the uncertain location of the lubricating oil when the engine is running at a low speed. If the raised portion, the oil collecting groove and the oil guide groove are not provided, the lubricating oil will flow out directly through the oil outlet when the engine is running at a low speed. Affected by the viscosity, the lubricating oil will be dispersed on the edge of the oil outlet and may start to move on the surface of the cylinder head from the edge of the oil outlet, resulting in an uncertain falling trajectory of the lubricating oil, and then the lubricating oil cannot be accurately sprinkled to the designated position, and cannot play a good lubricating effect on the rotating component. After the raised portion, the oil collecting groove and the oil guide groove are provided, the lubricating oil is made use of the characteristic that the viscosity is relatively high at low temperature, so that after flowing out from the edge of the oil outlet, it is gathered at the tip of the raised portion along the oil guide groove and the oil collecting groove. The gathered lubricating oil falls by gravity from a state close to stillness, and the starting position of the falling trajectory and the starting speed direction of the falling are determined, so that the falling position of the lubricating oil can be determined, so that it can be accurately sprinkled to the designated position to play a good lubricating effect.

[0019] A second aspect of the present invention provides an engine, comprising a base, a rotating assembly for driving wheels to rotate, and the lubrication structure provided by the first aspect.

[0020] The third aspect of the present invention provides a motorcycle, comprising a body, wheels mounted on the body, and the engine provided in the second aspect; the engine is mounted on the body, and the rotating assembly is connected to the wheel. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 1 is a cross-sectional structural diagram of a cylinder head of a lubrication structure according to an embodiment of the present invention.

[0022] Figure 2 The lubrication structure of the embodiment of the present invention Figure 1 A view in the figure.

[0023] Figure 3The lubrication structure of the embodiment of the present invention Figure 1 Enlarged view of point B in .

[0024] Figure 4 The lubrication structure of the embodiment of the present invention Figure 3 Sectional view at C-C

[0025] Figure 5 It is a schematic diagram of the flow trajectory of lubricating oil in the lubrication structure of an embodiment of the present invention when the engine is in a low-speed operation state.

[0026] Figure 6 It is a schematic diagram of the flow trajectory of lubricating oil in the lubrication structure of an embodiment of the present invention when the engine is in a high-speed running state.

[0027] Figure 7 1 is a structural diagram of an engine according to an embodiment of the present invention.

[0028] In the figure, 100, cylinder head; 110, predetermined oil circuit; 111, first sub-oil circuit; 112, second sub-oil circuit; 120, recessed portion; 130, oil outlet; 131, arc-shaped edge; 140, oil collecting groove; 150, oil guide groove; 160, raised portion; 161, tip; 170, boss;

[0029] 200, a first lubricating oil circuit; 210, an oil pump; 220, a filter screen. DETAILED DESCRIPTION

[0030] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0031] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0032] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0033] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0035] The first aspect of the present invention provides a lubrication structure, and an embodiment of the lubrication structure is as follows:

[0036] Embodiment 1:

[0037] See also Figures 1 to 6 The present embodiment provides a lubrication structure, including a crankcase body, a cylinder block, a cylinder head, a cylinder cover 100, and an oil pump 210; the cylinder head and the cylinder cover 100 enclose a space for accommodating a gas distribution system, the cylinder cover 100 has a predetermined oil path 110 for lubricating oil to flow, and the oil pump 210 can drive the lubricating oil to flow in the predetermined oil path 110; the crankcase body is provided with an oil storage part, and the crankcase body, the cylinder block, the cylinder head, and the cylinder cover are provided with a first lubricating oil path that is sequentially connected, and the lubricating oil in the oil storage part is sequentially transported through the lubricating oil filter device and the oil pump through the first lubricating oil path, and the lubricating oil is sequentially transported from the crankcase body to the cylinder block, the cylinder head, and the cylinder cover. The oil is transported from the box body, cylinder block and cylinder head to the cylinder head 100, and the valve system in the accommodating space is lubricated; the first lubricating oil circuit includes the predetermined oil circuit 110; the surface of the cylinder head 100 is concave to form a concave portion 120, and the inner wall of the concave portion 120 is provided with an oil outlet 130 connected to the predetermined oil circuit 110; the surface of the cylinder head 100 is raised to form a raised portion 160 with a tip 161, and the side of the raised portion 160 is provided with an oil collecting groove 140 extending to the tip 161; the inner wall of the recessed portion 120 is recessed to form an oil guide groove 150, and the oil collecting groove 140 is connected to the oil outlet 130 through the oil guide groove 150.

[0038] In this embodiment, the surface of the cylinder head 100 refers to the surface of the accommodating chamber that accommodates the rotating components of the engine when applied to the engine.

[0039] The following describes the working process of the engine at different speeds in this embodiment:

[0040] When the engine is in a low-speed operation state, the temperature of the lubricating oil is low, the fluidity of the lubricating oil is poor, and the viscosity is high. At this time, after the oil pump 210 drives the lubricating oil into the predetermined oil path 110, it will flow at a low flow rate attached to the inner wall of the predetermined oil path 110 until the lubricating oil flows to the oil outlet 130. At this time, due to the effect of viscosity, the lubricating oil will pass through the edge of the oil outlet 130 into the oil guide groove 150, and continue to flow along the oil guide groove 150 into the oil collecting groove 140, and flow along the oil collecting groove 140 to the tip 161 of the protrusion 160. At this time, the lubricating oil can remain stationary at the tip 161 of the protrusion 160 under the effect of gravity and its viscosity at the tip 161 of the protrusion 160; and as the lubricating oil continuously gathers at the tip 161 of the protrusion 160, the gathered lubricating oil begins to drip downward under the effect of gravity in a nearly stationary state to lubricate the rotating components of the engine.

[0041] When the engine is running at high speed, the temperature of the lubricating oil is high, the fluidity of the lubricating oil is good, and the viscosity is low. At this time, after the oil pump 210 drives the lubricating oil into the predetermined oil path 110, it will flow at a high flow rate in the predetermined oil path 110 to the oil outlet 130. Under the effect of inertia, the lubricating oil will be directly sprayed out from the oil outlet 130 to lubricate the rotating components of the engine, and will not enter the oil guide groove 150.

[0042] Compared with the prior art, the lubrication structure of this embodiment has the following beneficial effects:

[0043] First, the lubrication structure of this embodiment is applied when the engine is running at a low speed, and can still provide good lubrication effect to the engine, thereby preventing the wear of components when the engine is running at a low speed.

[0044] Second, the lubrication structure of the embodiment of the present invention is provided with a raised portion 160, an oil collecting groove 140 and an oil guide groove 150, which can solve the problem of the lubricating oil spilling at an uncertain position when the engine is running at a low speed. If the raised portion 160, the oil collecting groove 140 and the oil guide groove 150 are not provided, the lubricating oil will flow out directly through the oil outlet 130 when the engine is running at a low speed. Affected by the viscosity, the lubricating oil will be dispersed on the edge of the oil outlet 130 and may start to move on the surface of the cylinder head 100 from the edge of the oil outlet 130, resulting in an uncertain falling trajectory of the lubricating oil, and then the lubricating oil cannot be accurately spilled to the designated position, and cannot have a good lubricating effect on the rotating components. After the raised portion 160, the oil collecting groove 140 and the oil guiding groove 150 are provided, the characteristic of the lubricating oil having a higher viscosity at low temperatures is utilized so that after the lubricating oil flows out from the edge of the oil outlet 130, it gathers at the tip 161 of the raised portion 160 along the oil guiding groove 150 and the oil collecting groove 140. The gathered lubricating oil falls from a nearly stationary state due to gravity, and the starting position of the falling trajectory and the starting speed direction of the falling are determined, thereby determining the falling position of the lubricating oil, so that the lubricating oil can be accurately sprinkled to the designated position to achieve a good lubrication effect.

[0045] Optionally, the raised portion is a cone structure.

[0046] Embodiment 2:

[0047] See also Figures 1 to 6 This embodiment is improved based on embodiment 1.

[0048] In the lubrication structure, there are multiple protrusions 160 and multiple oil guide grooves 150. The multiple oil guide grooves 150 correspond one to one with the multiple protrusions 160. The oil collecting groove 140 of each protrusion 160 is connected to the oil outlet 130 through the corresponding oil guide groove 150.

[0049] In this embodiment, by providing a plurality of raised portions 160 and a plurality of oil guide grooves 150, the proportion of lubricating oil that flows out from the oil outlet 130 and enters each oil guide groove 150 can be increased, that is, the proportion of lubricating oil that flows out from the oil outlet 130 and does not enter the oil guide groove 150 but directly drips can be reduced, thereby better controlling the location where the lubricating oil is spilled to improve the lubrication effect on the rotating component.

[0050] Embodiment 3:

[0051] See also Figures 1 to 6 This embodiment is improved based on embodiment 2.

[0052] In the lubrication structure, multiple oil guide grooves 150 are arranged in a circle on the outside of the oil outlet 130 in sequence; the oil outlet 130 includes multiple sections of predetermined arcuate edges, which correspond to the multiple oil guide grooves 150 one by one, and each predetermined arcuate edge is respectively in the corresponding oil guide groove 150, and the multiple sections of the predetermined arcuate edges are connected end to end.

[0053] In this embodiment, the predetermined arc edges in the corresponding oil guide groove 150 are arranged to be connected end to end, that is, when the lubricating oil flows to the edge of the oil outlet 130, the lubricating oil will be on one of the predetermined arc edges and can enter the oil guide groove 150 from the predetermined arc edge. In this way, nearly all the lubricating oil in the predetermined oil path 110 can enter the oil guide groove 150 and gather at the tip 161 of the raised portion 160, thereby improving the control effect of the low-temperature lubricating oil and better lubricating the rotating component.

[0054] Preferably, the central angles of the plurality of predetermined arc-shaped edges are respectively equal.

[0055] Preferably, the number of the oil guide grooves 150 and the number of the protrusions 160 are four respectively.

[0056] Embodiment 4:

[0057] See also Figures 1 to 6 This embodiment is improved based on embodiment 1.

[0058] In the lubrication structure, the cylinder head 100 includes a side wall and an upper wall portion, the surface of the cylinder head 100 includes a side surface formed on the side wall and a bottom surface formed on the upper wall portion, the recessed portion 120 is formed on the bottom surface, and the raised portion 160 is formed on the bottom surface.

[0059] In this embodiment, when applied to the engine, the cylinder head 100 is set upside down, and the recessed portion 120 and the raised portion 160 are respectively set on the bottom surface. When the lubricating oil flows to the oil outlet 130, it can be directly sprayed downward under the action of gravity or flow through the oil guide groove 150 to the tip 161 of the raised portion 160 to gather and drip.

[0060] Embodiment 5:

[0061] See also Figures 1 to 6 This embodiment is improved based on embodiment 4.

[0062] In the lubrication structure, the predetermined oil circuit 110 includes a first sub-oil circuit 111 and a second sub-oil circuit 112; the first sub-oil circuit 111 is arranged in the side wall and has an oil inlet opened on the end surface of the side wall, and the first sub-oil circuit 111 is connected to the accommodating space through the oil inlet; the second sub-oil circuit 112 is arranged in the upper wall part, and the oil outlet 130 is connected to the second sub-oil circuit 112.

[0063] In this embodiment, when the lubricating oil flows in the predetermined oil circuit 110, it enters the second sub-oil circuit 112 through the first sub-oil circuit 111, and then flows out directly through the oil outlet 130 or flows out after being gathered through the oil outlet 130, the oil guide groove 150, and the oil collecting groove 140, thereby achieving a good lubrication effect.

[0064] Embodiment 6:

[0065] See also Figures 1 to 6 This embodiment is improved based on embodiment 4.

[0066] In the lubrication structure, the cylinder head 100 further includes a boss 170 disposed on the upper wall portion in the first cavity, the recessed portion 120 is formed on the end surface of the boss 170 , and the raised portion 160 is formed on the end surface of the boss 170 .

[0067] In this embodiment, by setting the boss 170 and setting the recess 120 on the end surface of the boss 170, a certain distance is formed between the position of the recess 120 and the surface of the cylinder head 100, so that the setting process of the recess 120 is not easy to interfere with the predetermined oil circuit 110, thereby avoiding the occurrence of blockage of the predetermined oil circuit 110.

[0068] Embodiment 7:

[0069] See also Figures 1 to 6 This embodiment is improved based on embodiment 6.

[0070] In the lubricating structure, the upper wall portion in the first concave cavity is a plane, and the boss 170 is arranged to be inclined relative to the upper wall portion in the first concave cavity.

[0071] In this embodiment, the oil outlet 130 is tilted by tilting the boss 170, so that the oil outlet 130 is tilted, which can make the lubricating oil with high viscosity flow more easily into the oil guide groove 150. On the one hand, the tilted oil outlet 130 makes the lubricating oil have a horizontal component velocity and a vertical component velocity when it is at the oil outlet 130, thereby reducing the component velocity of the lubricating oil in the vertical direction, and the lubricating oil with high viscosity is more likely to adhere to the oil guide groove 150; on the other hand, the tilted oil outlet 130 will inevitably make the oil outlet 130 connected to the predetermined oil path 110 through a curved channel. When the lubricating oil is transported through the curved channel, under the continuous action of friction and the influence of increased distance, when the lubricating oil flows to the oil outlet 130, the speed is at a lower level, so that the lubricating oil with high viscosity can adhere to the oil guide groove 150.

[0072] Embodiment 8:

[0073] See also Figures 1 to 6 This embodiment is improved based on embodiment 1.

[0074] In the lubrication structure, in the cross section of the oil guiding groove 150 , the inner wall of the oil guiding groove 150 is arc-shaped; in the cross section of the oil collecting groove 140 , the inner wall of the oil collecting groove 140 is arc-shaped.

[0075] In this embodiment, the oil guiding groove 150 and the oil collecting groove 140 are respectively configured as arc-shaped structures, thereby reducing the resistance of the lubricating oil flowing in the oil guiding groove 150 and the oil collecting groove 140 respectively.

[0076] Preferably, the oil guide groove 150 and the oil outlet 130 are smoothly connected so that the relatively viscous fluid coming out of the outlet can be firmly bonded to the inner wall of the oil guide groove 150 .

[0077] Preferably, the oil guide groove 150 extends radially outward from the oil outlet 130, and the flow area of ​​the oil guide groove 150 gradually decreases in the radially outward direction of the oil outlet 130, and the flow area of ​​the oil collecting groove 140 gradually decreases from the bottom where the ridge 160 is connected to the bottom surface to the tip 161 of the ridge. Therefore, when the lubricating oil flows in the oil guide groove 150 and the oil collecting groove 140, a certain degree of gathering effect has been achieved.

[0078] A second aspect of the present invention provides an engine, and an embodiment of the engine is as follows:

[0079] Embodiment 9:

[0080] This embodiment provides an engine, including a base, a rotating component for driving wheels to rotate, and a lubrication structure of any one of Embodiments 1 to 8.

[0081] Preferably, the filtering device comprises a filter screen 220 .

[0082] A third aspect of the present invention provides a motorcycle, and an embodiment of the motorcycle is as follows:

[0083] Embodiment 10:

[0084] This embodiment provides a motorcycle, including a body, wheels mounted on the body, and the engine of Embodiment 9; the engine is mounted on the body, and a rotating component is connected to the wheel.

[0085] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0086] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A lubrication structure, comprising a crankcase body, a cylinder block, a cylinder head, a cylinder cover, and an oil pump; The cylinder head and the cylinder cover enclose to form an accommodation space. The cylinder cover has a predetermined oil passage for the lubricating oil to flow therein, and the oil pump can drive the lubricating oil to flow in the predetermined oil passage; The crankcase body is provided with an oil storage part. A first lubricating oil passage that is sequentially communicated is arranged in the crankcase body, the cylinder block, the cylinder head, and the cylinder cover. The lubricating oil in the oil storage part is sequentially transported through a lubricating oil filtering device and the oil pump via the first lubricating oil passage. The lubricating oil is sequentially transported from the crankcase body, the cylinder block, and the cylinder head to the cylinder cover, and lubricates the gas distribution system in the accommodation space; the first lubricating oil passage includes the predetermined oil passage; A recessed part is formed by the surface depression of the cylinder cover, and an oil outlet communicated with the predetermined oil passage is formed on the inner wall of the recessed part; It is characterized in that A raised part with a tip is formed by the surface bulge of the cylinder cover. An oil collecting groove extending to the tip is formed on the side surface of the raised part; a guiding oil groove is formed by the inner wall depression of the recessed part. An oil outlet passage is communicated between the predetermined oil passage and the guiding oil groove. The oil collecting groove is communicated with the oil outlet through the guiding oil groove, so that the lubricating oil in the low-temperature state flows out from the edge of the oil outlet and then gathers at the tip of the raised part along the guiding oil groove and the oil collecting groove; the number of the raised parts is multiple, and the number of the guiding oil grooves is multiple. The multiple guiding oil grooves and the multiple raised parts correspond one by one. The oil collecting grooves of each raised part are respectively communicated with the oil outlet through the corresponding guiding oil grooves; the multiple guiding oil grooves are sequentially arranged in a ring outside the oil outlet; the oil outlet includes multiple sections of predetermined arc-shaped edges, and the multiple sections of predetermined arc-shaped edges respectively correspond to the multiple guiding oil grooves. Each predetermined arc-shaped edge is respectively located in the corresponding guiding oil groove, and the multiple sections of predetermined arc-shaped edges are connected end to end.

2. The lubrication structure according to claim 1, It is characterized in that The cylinder cover includes an upper wall part and a side wall surrounding the edge of the upper wall part. The upper wall part and the side wall enclose to form a first cavity; the recessed part is formed on the upper wall part in the first cavity, and the raised part is formed on the upper wall part in the first cavity.

3. The lubrication structure according to claim 2, It is characterized in that The predetermined oil passage includes a first sub-oil passage and a second sub-oil passage; The first sub-oil passage is arranged in the side wall and has an oil inlet opened on the end surface of the side wall. The first sub-oil passage is communicated with the accommodation space through the oil inlet; The second sub-oil passage is arranged in the upper wall part, and the oil outlet is communicated with the second sub-oil passage.

4. The lubrication structure according to claim 2, It is characterized in that The cylinder cover further includes a boss arranged on the upper wall part in the first cavity. The recessed part is formed on the end surface of the boss, and the raised part is formed on the end surface of the boss.

5. The lubrication structure according to claim 4, It is characterized in that The upper wall part in the first cavity is a plane, and the boss is inclined relative to the upper wall part in the first cavity.

6. The lubrication structure according to claim 1, characterized in that, in the cross-section of the oil guiding groove, the inner wall of the oil guiding groove is arc-shaped; in the cross-section of the oil collecting groove, the inner wall of the oil collecting groove is arc-shaped.

7. An engine, characterized in that, comprising a base, a rotating assembly for driving the wheels to rotate, and the lubrication structure according to any one of claims 1 to 6.

8. A motorcycle, characterized in that, comprising a vehicle body, wheels mounted on the vehicle body, and the engine according to claim 7; the engine is mounted on the vehicle body, and the rotating assembly is connected to the wheels.

Images