A motorcycle engine

Abstract

The application provides a motorcycle engine and belongs to the technical field of motorcycles. The motorcycle engine can solve the problem of low reliability of a water pump in the prior art. The motorcycle engine comprises a box body, a crankshaft and a water pump shaft arranged in the box body, a support shaft sleeve fixed on the box body and located in the box body, the water pump shaft is arranged in parallel with one side of the crankshaft and rotates through the inner hole of the support shaft sleeve, and an oil receiving structure is arranged on the outer wall of the top of the support shaft sleeve and communicates with the inner hole of the support shaft sleeve. The motorcycle engine can improve the reliability of the water pump and reduce the manufacturing cost of the engine.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of motorcycles, and relates to a motorcycle engine. BACKGROUND

[0002] As one of the main means of transportation for people's daily travel, motorcycles are deeply loved by people in cities due to their low driving difficulty and flexibility. The motorcycle engine is responsible for generating power and transmission, and is one of the core components of the motorcycle.

[0003] The oil pump and the water pump are main parts in the engine cooling and lubricating system, which ensures that each part of the engine has good cooling and lubrication. The power of the engine crankshaft can be transmitted to the water pump shaft of the water pump and the oil pump shaft of the oil pump to rotate, so that the water pump and the oil pump can operate. At present, the conventional motorcycle engine relies on bearings to install the water pump shaft and the oil pump shaft. For example, a patent document discloses a coupling device for an oil pump and a cooling pump (application number 202022501226.3), which comprises a common shaft, an oil pump body, a needle roller, an inner rotor, an outer rotor, a cooling pump body, an impeller and a cooling pump cover. The oil pump body and the cooling pump body are respectively sleeved on the common shaft, and one end of the common shaft is respectively installed on the oil pump body and the cooling pump body through bearings. This structure has the following shortcomings: first, in order to ensure the installation accuracy, the corresponding bearing mounting position or bearing seat needs to be processed, which leads to complex product structure, high cost, and also increases the manufacturing cost of the product; in addition, the bearing needs to be lubricated during work, but even if the bearing is lubricated well and installed correctly, the performance of the bearing will be reduced due to the fatigue of the rolling contact surface after a long time of use, which will cause the problem of loud noise of the bearing, reduce the installation accuracy of the common shaft, and further reduce the working reliability of the water pump. SUMMARY

[0004] The purpose of the present application is to solve the above-mentioned problems existing in the prior art, and to provide a motorcycle engine. The technical problem to be solved by the present application is how to make the water pump of the engine have higher working reliability and reduce the manufacturing cost of the engine.

[0005] The purpose of the present application can be realized by the following technical scheme: a motorcycle engine comprising a box body, a crankshaft and a water pump shaft arranged in the box body, characterized in that a support shaft sleeve is fixed on the box body and located in the box body, the water pump shaft is arranged in parallel on one side of the crankshaft and rotates through the inner hole of the support shaft sleeve, and an oil receiving structure is arranged on the outer wall of the top of the support shaft sleeve and communicates with the inner hole of the support shaft sleeve.

[0006] In the motorcycle engine, a support shaft sleeve is added on the box body to install the water pump shaft, and the contact part between the water pump shaft and the support shaft sleeve needs to be lubricated to ensure the stable rotation of the water pump shaft. During the rotation of the crankshaft, the lubricating oil on the crankshaft will be thrown out. At this time, since the water pump shaft and the crankshaft are both located in the box body and are arranged in parallel on one side of the crankshaft, the lubricating oil thrown out of the crankshaft will fall on the water pump shaft, thereby lubricating the contact part between the water pump shaft and the support shaft sleeve with the lubricating oil thrown out of the crankshaft. At the same time, since the outer wall at the top of the support shaft sleeve is provided with an oil receiving structure communicating with the inner hole of the support shaft sleeve, the oil receiving structure has the function of collecting lubricating oil, and the collected lubricating oil will finally flow into the inner hole of the support shaft sleeve, thereby greatly improving the lubricating effect, ensuring the long-term stable operation of the water pump shaft, and improving the reliability of the water pump operation. Since the support shaft sleeve can be manufactured separately, the corresponding oil receiving structure can be easily processed, and high processing precision can be achieved, so that the support shaft sleeve has high matching precision with the water pump shaft, and the installation precision of the water pump shaft is ensured to be high. Through the above improvements, the motorcycle engine can install the water pump shaft without bearings, thereby solving the problems of high cost and low water pump operation reliability caused by the installation of the water pump shaft with bearings in the prior art.

[0007] In the motorcycle engine described above, the motorcycle engine further comprises a water pump body, a water pump mounting hole is formed on the box body, the water pump body is inserted and fixed in the water pump mounting hole, and one end of the support shaft sleeve is located in the water pump mounting hole and is integrally connected with the water pump body. This design not only ensures the stable installation of the water pump body, but also makes the installation stability of the support shaft sleeve and the water pump shaft high because the support shaft sleeve is integrally formed with the water pump body.

[0008] In the motorcycle engine described above, the oil receiving structure comprises two reinforcing ribs arranged on the outer wall at the top of the support shaft sleeve, the two reinforcing ribs extend along the axial direction of the support shaft sleeve, and an oil receiving groove with an upward notch is formed between the two reinforcing ribs, and an oil passing gap communicating with the inner hole of the support shaft sleeve is arranged on the groove bottom of the oil receiving groove. The support shaft sleeve is located in the box body, and only one end of the support shaft sleeve is connected with the water pump body, so that the oil receiving groove on the support shaft sleeve is not blocked by the water pump mounting hole, and the lubricating oil thrown out by the cam can fall smoothly into the oil receiving groove. The two reinforcing ribs have dual functions, one is to strengthen the structure of the support shaft sleeve, so that the support shaft sleeve has high structural strength and stability even if only one end is connected with the water pump body, thereby ensuring good stability of the water pump shaft; the second function of the two reinforcing ribs is to form the oil receiving groove with the upward notch, and the lubricating oil in the oil receiving groove can enter the inner hole of the support shaft sleeve through the oil passing gap, thereby fully lubricating the contact part between the water pump shaft and the support shaft sleeve, ensuring the long-term stable operation of the water pump shaft, and improving the reliability of the water pump operation.

[0009] In the motorcycle engine, a strip-shaped oil storage groove is formed on the inner wall of the support sleeve in the axial direction, the oil storage groove and the oil receiving groove are arranged opposite to each other in the radial direction of the support sleeve, and the oil storage groove is connected with the oil passing gap. The structure makes the lubricating oil in the oil receiving groove enter the oil storage groove through the oil passing gap, the oil storage groove has the function of storing lubricating oil, and the contact position of the pump shaft and the support sleeve can be more fully lubricated.

[0010] In the motorcycle engine, one end of the support sleeve adjacent to the water pump body is the outer end of the support sleeve, the oil passing gap is located at the inner end of the support sleeve and penetrates the inner end surface of the support sleeve, the outer wall of the water pump shaft has an annular protrusion arranged in the circumferential direction thereof, a retainer ring is sleeved on the water pump shaft, and the retainer ring is clamped and fixed between the annular protrusion and the inner end surface of the support sleeve. By arranging the retainer ring, the retainer ring is clamped and fixed between the annular protrusion and the inner end surface of the support sleeve, so that the retainer ring not only has the function of axially positioning the water pump shaft, but also has the function of blocking the lubricating oil because the oil passing gap also penetrates the inner end surface of the support sleeve. At this time, the retainer ring has the function of blocking the lubricating oil, so that the oil passing gap itself has the function of collecting lubricating oil, more lubricating oil can enter the inner hole of the support sleeve, and the lubrication effect is improved. Moreover, the oil passing gap is located at the inner end of the support sleeve, so that the oil passing gap is closer to the middle position of the tank body, so that the lubricating oil thrown out by the cam can be more easily collected.

[0011] In the motorcycle engine, one end of the support sleeve adjacent to the water pump body is the outer end of the support sleeve, the oil passing gap is located at the inner end of the support sleeve and penetrates the inner end surface of the support sleeve, the outer end of the water pump shaft extends into the impeller chamber and is connected with the water pump impeller, and an oil seal is further sleeved on the water pump shaft, which can seal and isolate the inner hole of the support sleeve from the impeller chamber. The oil storage groove has a structure of penetrating both ends, which is convenient to process. By arranging the oil seal, the oil and water between the inner hole of the support sleeve and the impeller chamber can be isolated, and the water in the impeller chamber is prevented from leaking into the support sleeve to affect the lubrication effect of the water pump shaft.

[0012] In the motorcycle engine, the inner wall of the water pump body is provided with a stepped groove at the outer port of the inner hole, the oil seal is arranged in the stepped groove, and the oil seal and the outer port of the inner hole are spaced apart to form an oil storage cavity. The side wall of the stepped groove is further provided with a through hole for connecting the oil storage cavity and the inner cavity of the box. By arranging the stepped groove, the installation of the oil seal is facilitated, and the oil seal has good sealing effect. Since the oil seal and the outer port of the inner hole of the support shaft sleeve are spaced apart to form an oil storage cavity, the oil storage cavity has a certain function of storing lubricating oil, so that the contact part of the water pump shaft and the support shaft sleeve can be efficiently lubricated at any position, ensuring the long-term stable operation of the water pump shaft and improving the working reliability of the water pump. The through hole connects the oil storage cavity and the inner cavity of the box, so that the through hole has a pressure relief function, can discharge the gas in the oil storage cavity to reduce the pressure, and ensure that the lubricating oil in the oil storage groove can flow smoothly into the oil storage cavity.

[0013] In the motorcycle engine, the inner wall of the water pump body is provided with a stepped groove at the outer port of the inner hole, the oil seal is arranged in the stepped groove, and the oil seal and the outer port of the inner hole are spaced apart to form an oil storage cavity. The side wall of the stepped groove is further provided with a through hole for connecting the oil storage cavity and the inner cavity of the box. By arranging the stepped groove, the installation of the oil seal is facilitated, and the oil seal has good sealing effect. Since the oil seal and the outer port of the inner hole of the support shaft sleeve are spaced apart to form an oil storage cavity, the oil storage cavity has a certain function of storing lubricating oil, so that the contact part of the water pump shaft and the support shaft sleeve can be efficiently lubricated at any position, ensuring the long-term stable operation of the water pump shaft and improving the working reliability of the water pump. The through hole connects the oil storage cavity and the inner cavity of the box, so that the through hole has a pressure relief function, can discharge the gas in the oil storage cavity to reduce the pressure, and ensure that the lubricating oil in the oil storage groove can flow smoothly into the oil storage cavity.

[0014] In the motorcycle engine, the inner wall of the water pump body is provided with a stepped groove at the outer port of the inner hole, the oil seal is arranged in the stepped groove, and the oil seal and the outer port of the inner hole are spaced apart to form an oil storage cavity. The side wall of the stepped groove is further provided with a through hole for connecting the oil storage cavity and the inner cavity of the box. By arranging the stepped groove, the installation of the oil seal is facilitated, and the oil seal has good sealing effect. Since the oil seal and the outer port of the inner hole of the support shaft sleeve are spaced apart to form an oil storage cavity, the oil storage cavity has a certain function of storing lubricating oil, so that the contact part of the water pump shaft and the support shaft sleeve can be efficiently lubricated at any position, ensuring the long-term stable operation of the water pump shaft and improving the working reliability of the water pump. The through hole connects the oil storage cavity and the inner cavity of the box, so that the through hole has a pressure relief function, can discharge the gas in the oil storage cavity to reduce the pressure, and ensure that the lubricating oil in the oil storage groove can flow smoothly into the oil storage cavity.

[0015] In the motorcycle engine, the inner wall of the water pump body is provided with a stepped groove at the outer port of the inner hole, the oil seal is arranged in the stepped groove, and the oil seal and the outer port of the inner hole are spaced apart to form an oil storage cavity. The side wall of the stepped groove is further provided with a through hole for connecting the oil storage cavity and the inner cavity of the box. By arranging the stepped groove, the installation of the oil seal is facilitated, and the oil seal has good sealing effect. Since the oil seal and the outer port of the inner hole of the support shaft sleeve are spaced apart to form an oil storage cavity, the oil storage cavity has a certain function of storing lubricating oil, so that the contact part of the water pump shaft and the support shaft sleeve can be efficiently lubricated at any position, ensuring the long-term stable operation of the water pump shaft and improving the working reliability of the water pump. The through hole connects the oil storage cavity and the inner cavity of the box, so that the through hole has a pressure relief function, can discharge the gas in the oil storage cavity to reduce the pressure, and ensure that the lubricating oil in the oil storage groove can flow smoothly into the oil storage cavity.

[0016] Compared with the prior art, the motorcycle engine has the following advantages:

[0017] 1、 The motorcycle engine utilizes the lubricating oil thrown out of the crankshaft to lubricate the contact part of the water pump shaft and the supporting sleeve. Meanwhile, the outer wall of the top of the supporting sleeve is provided with an oil receiving structure communicating with the inner hole of the supporting sleeve, the oil receiving structure has the function of collecting lubricating oil, and the collected lubricating oil will finally flow into the inner hole of the supporting sleeve, thereby greatly improving the lubricating effect, ensuring the long-term stable operation of the water pump shaft, and improving the reliability of the water pump operation. Since the supporting sleeve can be separately machined and manufactured, the corresponding oil receiving structure can be easily machined, and high machining precision is achieved, so that the supporting sleeve has high matching precision with the water pump shaft, and the installation precision of the water pump shaft is ensured to be high.

[0018] 2、 The motorcycle engine can save the bearing for installing the water pump shaft and the oil pump shaft, and solves the problems of high cost and low water pump operation reliability caused by the bearing installation of the water pump shaft in the prior art.

[0019] 3、 The motorcycle engine only needs one driving source to realize the synchronous rotation of the water pump shaft and the oil pump shaft, so the structure of the motorcycle engine can be simplified. The water pump shaft is a hollow pipe body, realizing the lightweight design of the water pump shaft, and reducing the manufacturing cost. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a schematic view of the motorcycle engine after hiding some parts.

[0021] Figure 2 is a partial perspective view of the motorcycle engine.

[0022] Figure 3 is Figure 2 an enlarged view of A in the figure.

[0023] Figure 4 is Figure 2 a top view.

[0024] Figure 5 is Figure 4 a sectional view of A-A in the figure.

[0025] Figure 6 is Figure 5 a partial enlarged view.

[0026] Figure 7 is Figure 6 an enlarged view of A in the figure.

[0027] Figure 8 is a schematic view of the water pump body after hiding some parts.

[0028] Figure 9 is Figure 8A cross-sectional view of the illustrated component.

[0029] Figure 10 is a cross-sectional view of the oil receiving structure in Example Two.

[0030] In the figure, 1, the box body; 1a, the partition; 1b, the crank cavity; 1c, the speed cavity; 1d, the oil throwing gap; 2, the crankshaft; 3, the water pump shaft; 31, the plug-in slot; 4, the water pump body; 41, the support shaft sleeve; 411, the inner hole; 42, the impeller chamber; 43, the step groove; 44, the oil storage cavity; 45, the through hole; 5, the water pump mounting hole; 6, the reinforcing rib; 7, the oil receiving groove; 8, the oil passing gap; 9, the oil storage groove; 10, the annular protrusion; 11, the check ring; 12, the water pump impeller; 13, the oil seal; 14, the oil pump shaft; 141, the flat square; 15, the oil receiving cup; 16, the mounting hole. DETAILED DESCRIPTION

[0031] The following is a specific embodiment of the present application and further describes the technical solutions of the present application in conjunction with the drawings, but the present application is not limited to these embodiments.

[0032] Example One

[0033] As Figures 1 to 3 shown, the motorcycle engine includes a box body 1, a water pump body 4, the box body 1 is provided with a crankshaft 2, a water pump shaft 3, and an oil pump shaft 14. The water pump shaft 3 is a hollow pipe body, the oil pump shaft 14 is coaxially arranged with the water pump shaft 3, the oil pump shaft 14 is provided with a flat square 141 at one end close to the water pump shaft 3, and the water pump shaft 3 is provided with a plug-in slot 31 for plug-in cooperation with the flat square 141 at one end close to the oil pump shaft 14. The box body 1 is provided with a water pump mounting hole 5, the water pump body 4 is plug-in fixed in the water pump mounting hole 5, and the box body 1 is fixedly provided with a support shaft sleeve 41 located in the box body 1, one end of the support shaft sleeve 41 is located in the water pump mounting hole 5 and integrally connected with the water pump body 4. The water pump shaft 3 is arranged in parallel on one side of the crankshaft 2 and rotatably penetrates the inner hole 411 of the support shaft sleeve 41, and the outer wall of the top of the support shaft sleeve 41 is provided with an oil receiving structure communicating with the inner hole 411 of the support shaft sleeve 41. The box body 1 is provided with a partition 1a arranged vertically and in parallel with the axial direction of the water pump shaft 3, the partition 1a divides the inner cavity of the box body 1 into a crank cavity 1b and a speed cavity 1c, the crankshaft 2 is located in the crank cavity 1b and the water pump shaft 3 is located in the speed cavity 1c, the water pump shaft 3 is arranged close to the partition 1a and the axis of the water pump shaft 3 is lower than the axis of the crankshaft 2, and the bottom of the partition 1a has an oil throwing gap 1d opposite to the inner end of the support shaft sleeve 41.

[0034] Further, as Figures 3 to 6As shown, the oil receiving structure comprises two reinforcing ribs 6 arranged on the outer wall of the top of the support shaft sleeve 41, both of which extend along the axial direction of the support shaft sleeve 41 and form an oil receiving groove 7 with the opening upward between the two reinforcing ribs 6, and the groove bottom of the oil receiving groove 7 is provided with an oil passing gap 8 penetrating through the inner side wall of the support shaft sleeve 41. The end of the support shaft sleeve 41 adjacent to the water pump body 4 is the outer end of the support shaft sleeve 41, and the oil passing gap 8 is located at the inner end of the support shaft sleeve 41 and also penetrates through the inner end face of the support shaft sleeve 41. The outer wall of the water pump shaft 3 has an annular protrusion 10 arranged along the circumferential direction thereof, and the water pump shaft 3 is sleeved with a check ring 11, which is clamped and fixed between the annular protrusion 10 and the inner end face of the support shaft sleeve 41. The distance from the outer circumferential surface of the check ring 11 to the outer wall of the water pump shaft 3 is greater than the distance from the groove bottom of the oil receiving groove 7 to the outer wall of the water pump shaft 3. By arranging the check ring 11, the check ring 11 has the function of blocking the lubricating oil, so that the oil passing gap itself has the function of collecting lubricating oil, and more lubricating oil can enter the inner hole 411 of the support shaft sleeve 41, thereby improving the lubrication effect.

[0035] As shown in Figures 5 to 8 The inner wall of the support shaft sleeve 41 is provided with a strip-shaped oil storage groove 9 along the axial direction, the oil storage groove 9 is arranged opposite to the oil receiving groove 7 along the radial direction of the support shaft sleeve 41, and the oil storage groove 9 is in communication with the oil passing gap 8. This structure enables the lubricating oil in the oil receiving groove 7 to enter the oil storage groove 9 through the oil passing gap 8, and the oil storage groove 9 has the function of storing lubricating oil, so that the contact part of the pump shaft and the support shaft sleeve 41 can be more fully lubricated.

[0036] As shown in Figures 6 to 8 One end of the oil storage groove 9 penetrates through the outer end face of the support shaft sleeve 41, the other end of the oil storage groove 9 is in communication with the oil passing gap 8, the water pump body 4 has an impeller chamber 42, and the water pump impeller 12 is arranged in the impeller chamber 42. The outer end of the water pump shaft 3 extends into the impeller chamber 42 and is connected with the water pump impeller 12, and the water pump shaft 3 is further sleeved with an oil seal 13 which can seal and isolate the inner hole 411 of the support shaft sleeve 41 from the impeller chamber 42. By arranging the oil seal 13, the oil and water between the inner hole 411 of the support shaft sleeve 41 and the impeller chamber 42 can be isolated, preventing the water in the impeller chamber 42 from leaking into the support shaft sleeve 41 and affecting the lubrication effect of the water pump shaft 3.

[0037] As shown in Figures 6 to 9As shown, the inner wall of the pump body 4 is provided with a stepped groove 43 located at the outer port of the inner hole 411 of the support bushing 41. The oil seal 13 is disposed in the stepped groove 43, and there is a gap between the oil seal 13 and the outer port of the inner hole 411 of the support bushing 41 to form an oil storage chamber 44. The side wall of the stepped groove 43 is also provided with a through hole 45 that connects the oil storage chamber 44 to the inner cavity of the housing 1. This structure enables the oil storage chamber 44 to have a certain function of storing lubricating oil, so that any position of the contact part between the pump shaft 3 and the support bushing 41 can be efficiently lubricated, ensuring the long-term stable operation of the pump shaft 3 and improving the reliability of the pump. The through hole 45 connects the oil storage chamber 44 and the inner cavity of the housing 1, so that the through hole 45 has a pressure relief function, which can discharge the gas in the oil storage chamber 44 to reduce the pressure and ensure that the lubricating oil in the oil storage groove 9 can flow smoothly into the oil storage chamber 44.

[0038] During the rotation of the crankshaft 2 of this motorcycle engine, the lubricating oil on the crankshaft 2 is thrown outwards. Since both the water pump shaft 3 and the crankshaft 2 are located inside the housing 1 and arranged parallel to one side of the crankshaft 2, the lubricating oil thrown off the crankshaft 2 will fall onto the water pump shaft 3, thus using the lubricating oil thrown off the crankshaft 2 to lubricate the contact area between the water pump shaft 3 and the support bushing 41. At the same time, since the outer wall of the top of the support bushing 41 is provided with an oil receiving structure that communicates with the inner hole 411 of the support bushing 41, the oil receiving structure has the function of collecting lubricating oil. The collected lubricating oil will eventually flow into the inner hole 411 of the support bushing 41, thereby greatly improving the lubrication effect, ensuring the long-term stable operation of the water pump shaft 3, and improving the reliability of the water pump operation.

[0039] Example 2

[0040] This embodiment is basically the same as embodiment one in structure and principle, except that: Figure 10 As shown, the oil receiving structure includes an oil receiving cup 15. The side wall of the support bushing 41 has a through mounting hole 16 at both ends. The oil receiving cup 15 is fixed in the mounting hole 16, and the inner cavity of the oil receiving cup 15 is connected to the oil storage groove 9 in the support bushing 41.

[0041] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

[0042] Although the terms of 1, box; 1a, partition; 1b, crank cavity; 1c, speed cavity; 1d, oil throwing gap; 2, crankshaft; 3, water pump shaft; 31, plug-in slot; 4, water pump body; 41, support shaft sleeve; 411, inner hole; 42, impeller chamber; 43, step groove; 44, oil storage cavity; 45, through hole; 5, water pump mounting hole; 6, reinforcing rib; 7, oil receiving groove; 8, oil passing gap; 9, oil storage groove; 10, annular protrusion; 11, check ring; 12, water pump impeller; 13, oil seal; 14, oil pump shaft; 141, flat square; 15, oil receiving cup; 16, mounting hole, etc. are used more in this article, but the possibility of using other terms is not excluded. The use of these terms is only to facilitate the description and explanation of the essence of the invention; any additional limitation is contrary to the spirit of the invention.

Claims

1. A motorcycle engine comprising a casing (1) and a water pump body (4) fixed to the casing (1), said water pump body (4) having an impeller chamber (42) therein, a crankshaft (2) and a water pump shaft (3) being provided in the casing (1), characterized in that, The box (1) is provided with a support shaft sleeve (41) in the box (1), the water pump shaft (3) is arranged parallel to one side of the crankshaft (2), the water pump shaft (3) rotates through the inner hole (411) of the support shaft sleeve (41), the outer wall of the top of the support shaft sleeve (41) is provided with an oil receiving structure communicated with the inner hole (411) of the support shaft sleeve (41) through an oil passing gap (8); the oil receiving structure comprises two reinforcing ribs (6) arranged on the outer wall of the top of the support shaft sleeve (41), the two reinforcing ribs (6) extend along the axial direction of the support shaft sleeve (41), and an oil receiving groove (7) with an upward notch is formed between the two reinforcing ribs (6), the bottom of the oil receiving groove (7) is provided with an oil passing gap (8) communicated with the inner hole (411) of the support shaft sleeve (41); a strip-shaped oil storage groove (9) is formed on the inner wall of the support shaft sleeve (41) in the axial direction, a step groove (43) is arranged on the inner wall of the water pump body (4) at the outer end of the inner hole (411), an oil seal (13) capable of sealing and isolating the inner hole (411) of the support shaft sleeve (41) and the impeller chamber (42) is arranged in the step groove (43), the oil seal (13) and the outer end of the inner hole (411) are spaced apart to form an oil storage cavity (44), and a through hole (45) for connecting the oil storage cavity (44) and the inner cavity of the box (1) is arranged on the side wall of the step groove (43), and the two ends of the oil storage groove (9) are communicated with the oil storage cavity (44) and the oil passing gap (8) respectively.

2. The motorcycle engine according to claim 1, characterized in that, The box (1) is provided with a water pump mounting hole (5), the water pump body (4) is inserted and fixed in the water pump mounting hole (5), and one end of the support shaft sleeve (41) is located in the water pump mounting hole (5) and is integrally connected with the water pump body (4).

3. The motorcycle engine according to claim 2, characterized in that, The oil storage groove (9) and the oil receiving groove (7) are arranged opposite in the radial direction of the support shaft sleeve (41).

4. The motorcycle engine of claim 3, wherein One end of the support shaft sleeve (41) adjacent to the water pump body (4) is the outer end of the support shaft sleeve (41), the oil passing gap (8) is located at the inner end of the support shaft sleeve (41) and penetrates the inner end face of the support shaft sleeve (41), the outer wall of the water pump shaft (3) is provided with an annular protrusion (10) arranged in the circumferential direction, a retainer ring (11) is arranged on the water pump shaft (3), and the retainer ring (11) is clamped and fixed between the annular protrusion (10) and the inner end face of the support shaft sleeve (41).

5. The motorcycle engine of claim 4, wherein One end of the oil storage groove (9) penetrates the outer end face of the support shaft sleeve (41), the impeller chamber (42) is provided with a water pump impeller (12), and the outer end of the water pump shaft (3) extends into the impeller chamber (42) and is connected with the water pump impeller (12).

6. The motorcycle engine according to any one of claims 1 to 5, characterized in that, The box (1) is internally provided with a vertical partition plate (1a) parallel to the axis direction of the water pump shaft (3), the partition plate (1a) divides the inner cavity of the box (1) into a crank cavity (1b) and a gear cavity (1c), the crank (2) is located in the crank cavity (1b) and the water pump shaft (3) is located in the gear cavity (1c), the water pump shaft (3) is arranged close to the partition plate (1a) and the axis center line of the water pump shaft (3) is lower than the axis center line of the crank (2), the bottom of the partition plate (1a) is provided with an oil throwing gap (1d) opposite to the inner end of the supporting shaft sleeve (41).

7. The motorcycle engine according to any one of claims 1 to 5, characterized in that, The motorcycle engine further comprises an oil pump shaft (14) coaxially arranged with the water pump shaft (3), the water pump shaft (3) is a hollow pipe body, the oil pump shaft (14) is provided with a flat square (141) at one end close to the water pump shaft (3), and the water pump shaft (3) is provided with a plug-in groove (31) at one end close to the oil pump shaft (14) for plug-in cooperation with the flat square (141).

8. The motorcycle engine of claim 4, wherein The distance from the outer circumferential surface of the blocking ring (11) to the outer wall of the water pump shaft (3) is greater than the distance from the groove bottom of the oil receiving groove (7) to the outer wall of the water pump shaft (3).

Images