A cooling structure for a magneto of a motorcycle engine

Abstract

The present invention provides a magneto cooling structure for a motorcycle engine, belonging to the technical field of motorcycles. It solves the problem of poor cooling effect of existing magneto cooling structures. The magneto cooling structure of the motorcycle engine comprises a crankshaft having a lubricating oil hole, a flywheel sleeved on the crankshaft and having a concave cavity, a locking member inserted into the lubricating oil hole and positioning the flywheel on the crankshaft, and a coil disposed in the concave cavity. The magneto cooling structure comprises a lubricating oil flow channel provided on the locking member, the oil inlet of the lubricating oil flow channel being connected to the lubricating oil hole, the oil outlet of the lubricating oil flow channel being oriented obliquely or perpendicularly relative to the axial direction of the crankshaft, and the oil outlet of the lubricating oil flow channel being oriented toward the coil. The magneto cooling structure of the motorcycle engine can directly absorb the heat of the coil, thereby achieving rapid and effective cooling of the coil and reducing the risk of the coil burning out.

Description

Technical Field

[0001] The invention belongs to the technical field of motorcycles and relates to a motorcycle engine, in particular to a magneto cooling structure of a motorcycle engine. Background Art

[0002] A motorcycle's magneto is a small AC generator that uses permanent magnets to generate a magnetic field. The magneto is mainly composed of a motor rotor, coils, and fan blades. The rotor is equipped with permanent magnets and has a large mass. It is generally used as a flywheel for the motorcycle engine. The AC power generated by the magneto is used to power the lights, instrument panel, and battery on the motorcycle. Due to the increasingly high lighting requirements for the headlights and taillights on existing motorcycles, the wattage of the headlights and taillights is extremely high, which consumes a lot of electricity, resulting in a corresponding increase in the power generation load of the magneto. The only way to increase the power generation is to increase the number of poles. As a result, the temperature of the magneto coil is very high during operation. If the magneto works for a long time, the coil temperature is easily overheated and burns out.

[0003] In order to solve the problem of excessive coil temperature caused by long-term operation of the magneto, the China Patent Network has disclosed a lubricating oil circuit structure for a motorcycle engine [Application No.: 201611013699.0]. It discloses that a magneto is installed at the left end of the left crank, and the magneto is fixed by a fastening bolt that penetrates horizontally from the left end face of the left crank. The center of the fastening bolt is axially provided with a magneto lubricating oil hole that penetrates to the left end face. Lubricating oil is pumped into the first lubricating oil channel from the right end of the right crank, enters the crankpin lubricating oil channel through the oil inlet, and part of the lubricating oil in the crankpin lubricating oil channel enters the second lubricating oil channel through the oil outlet. Part of the lubricating oil in the second lubricating oil channel is sprayed out from the magneto lubricating oil hole, thereby cooling the magneto.

[0004] Since the above-mentioned magneto is installed on the left crank, the heat generated by the magneto during operation is directly transferred to the left crank, and the lubricating oil is sprayed out from the inside of the left crank to take away some of the heat on the left crank. Since the contact area between the magneto and the left crank is limited, the heat transfer of the magneto is slow. In addition, the aperture of the lubricating oil hole of the magneto is small, and the contact area between the lubricating oil and the left crank is also limited. Only a very small part of the heat can be taken away during the lubricating oil spraying out, resulting in a poor cooling effect on the left crank. Therefore, the above-mentioned lubricating oil circuit structure has a limited cooling effect on the magneto. The temperature of the magneto is high after long-term operation, and the risk of burning out the magneto is relatively high. Summary of the Invention

[0005] The purpose of the present invention is to solve the above problems in the existing technology and propose a cooling structure for a magneto of a motorcycle engine. The technical problem to be solved by the present invention is: how to improve the cooling effect of the magneto.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] A magneto cooling structure for a motorcycle engine, the engine comprising a crankshaft having a lubricating oil hole, a flywheel sleeved on the crankshaft and having a concave cavity, a locking member penetrating the lubricating oil hole and positioning the flywheel on the crankshaft, and a coil disposed in the concave cavity. The magneto cooling structure comprises a lubricating oil flow channel provided on the locking member, an oil inlet of the lubricating oil flow channel being connected to the lubricating oil hole, and is characterized in that an oil outlet of the lubricating oil flow channel is oriented obliquely or perpendicularly relative to the axial direction of the crankshaft, and the oil outlet of the lubricating oil flow channel faces the coil.

[0008] During engine operation, the crankshaft rotates, and lubricating oil enters the lubricating oil hole during crankshaft rotation. Because one end of the locking member is inserted into the lubricating oil hole, the outer end of the lubricating oil hole is blocked. This structure adopts a lubricating oil flow channel provided on the locking member. As the locking member rotates synchronously with the crankshaft, the lubricating oil flow channel draws oil from the lubricating oil hole. Because the oil outlet of the lubricating oil flow channel faces the coil, the oil outlet of the lubricating oil channel is located in the radial direction of the locking member. After the locking member rotates, the lubricating oil in the lubricating oil channel is thrown outward in the circumferential direction through the oil outlet under the action of centrifugal force, so that the lubricating oil is evenly thrown onto the coil. When a large amount of lubricating oil is thrown onto the coil, the lubricating oil drips from the coil into the concave cavity, thereby removing heat from the coil and quickly and effectively cooling the coil. In this magnetic motor cooling structure, the lubricating oil is in direct contact with the coil, and the lubricating oil is evenly distributed on the coil, which can directly absorb the heat of the coil, thereby achieving rapid and effective cooling of the coil, significantly improving the cooling effect of the coil and reducing the risk of coil burnout.

[0009] In the above-mentioned magneto cooling structure of a motorcycle engine, the lubricating oil flow channel includes an oil inlet flow channel arranged along the axial direction of the locking member and an oil outlet flow channel arranged along the radial direction of the locking member. The oil inlet of the oil inlet flow channel is connected to the lubricating oil hole, the oil outlet of the oil inlet flow channel is connected to the oil inlet of the oil outlet flow channel, and the oil outlet of the oil outlet flow channel faces the coil.

[0010] Through the setting of this structure, the lubricating oil flow channel adopts an L-shaped setting. During the rotation of the crankshaft, the lubricating oil in the lubricating oil hole first enters the oil inlet flow channel, and then enters the oil outlet flow channel from the oil inlet flow channel. Since the locking part rotates synchronously with the crankshaft, the lubricating oil in the oil outlet flow channel is thrown outward onto the coil under the action of centrifugal force.

[0011] In the above-mentioned magneto cooling structure of a motorcycle engine, the locking part includes a bolt with one end screwed to the lubricating oil hole and a washer sleeved on the bolt, the flywheel has a mounting portion sleeved on the crankshaft, and the washer is pressed against the end face of the mounting portion by the bolt, the oil inlet flow channel includes an oil groove 1 opened on the outer peripheral surface of the bolt, the oil inlet of the oil groove 1 is located on the end face of one end of the bolt passing through the lubricating oil hole, the oil outlet flow channel includes an oil groove 2 opened radially on the side face of the washer, the oil inlet of the oil groove 2 is located on the inner peripheral surface of the washer, and the oil outlet of the oil groove 2 is located on the outer peripheral surface of the washer.

[0012] This structure and the washers prevent the bolts from loosening, improving the flywheel's positioning. During crankshaft rotation, the bolts and washers rotate synchronously with the crankshaft, allowing the lubricating oil in the lubricating oil hole to flow into oil groove 1, which then flows into oil groove 2. Centrifugal force is applied to the lubricating oil in oil groove 2, which is then thrown outward onto the coil. In this structure, oil groove 1 is located on the outer circumference of the bolt, while oil groove 2 is located on the side of the washer, facilitating the machining of the lubricating oil flow path.

[0013] In the above-mentioned magneto cooling structure of a motorcycle engine, the second oil groove is opened on the side of the washer facing the bolt head, a notch is opened on the inner circumference of the washer, and the oil inlet of the second oil groove is connected to the notch.

[0014] Through the setting of this structure, the setting of the gap allows the lubricating oil from oil tank one to quickly enter oil tank two through the gap, ensuring that sufficient lubricating oil is supplied to oil tank two and ensuring that sufficient lubricating oil can be quickly thrown onto the coil.

[0015] In the above-mentioned magneto cooling structure of a motorcycle engine, the oil groove 1 is a linear oil groove, and the oil groove 1 is arranged obliquely in the axial direction of the bolt.

[0016] Through the setting of this structure, the oil groove 1 is inclined in the axial direction of the bolt so that when the bolt rotates with the crankshaft, the lubricating oil in the oil groove 1 will flow along the inclined direction of the oil groove 1 under the action of centrifugal force, so that the lubricating oil can be quickly thrown out of the oil groove 1, thereby increasing the flow speed of the lubricating oil, ensuring that the lubricating oil can be quickly thrown onto the coil, and improving the cooling effect of the coil.

[0017] In the above-mentioned magneto cooling structure of a motorcycle engine, the lubricating oil flow channel also includes a lubricating oil cavity, the oil outlet of the first oil tank is connected to the lubricating oil cavity, and the oil inlet of the second oil tank is connected to the lubricating oil cavity.

[0018] When the lubricating oil in the oil tank is thrown out onto the side of the gasket, the gasket and the bolt are subjected to axial impact force, thereby increasing the risk of the bolt loosening. After adopting the setting of this structure, the lubricating oil chamber has the function of buffering and storing the lubricating oil. The lubricating oil thrown out of the oil tank first enters the lubricating oil chamber first. Due to the large space of the lubricating oil chamber, the flow rate of the lubricating oil is reduced, thereby reducing the impact force on the bolt, making the bolt less likely to loosen.

[0019] In the above-mentioned magneto cooling structure of a motorcycle engine, there is a distance between the outer peripheral surface of the bolt and the inner wall of the mounting portion, and the lubricating oil cavity is formed.

[0020] In the above-mentioned magneto cooling structure of a motorcycle engine, one end of the bolt expands radially outward to form a connecting portion, the connecting portion is threadedly connected to the lubricating oil hole, there is a gap between the outer peripheral surface of the bolt and the inner wall of the lubricating oil hole, and the oil groove is opened on the outer peripheral surface of the connecting portion.

[0021] Through the setting of this structure, there is a gap between the outer peripheral surface of the bolt and the inner wall of the lubricating oil hole, so that a certain space is formed between the outer peripheral surface of the bolt and the inner wall of the lubricating oil hole. The space is connected to the lubricating oil cavity. The setting of this space reduces the flow rate of the lubricating oil flowing out of oil tank one, so that the flow rate of the lubricating oil gradually decreases from oil tank one to oil tank two, further reducing the impact force on the gasket and the bolt.

[0022] Compared with the prior art, the magnetic motor cooling structure of the motorcycle engine of the present invention has the following technical effects: after the crankshaft of this structure rotates, the lubricating oil in the lubricating oil hole is directly thrown onto the coil, and the lubricating oil is evenly distributed on the coil by circumferential spraying. The lubricating oil is in direct contact with the coil and can directly absorb the heat of the coil, thereby achieving rapid and effective cooling of the coil, significantly improving the cooling effect of the coil, and reducing the risk of the coil being burned out. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic cross-sectional view of the magneto cooling structure of the motorcycle engine.

[0024] Figure 2 yes Figure 1 Schematic diagram of the enlarged structure of part A in the middle.

[0025] Figure 3 It is a three-dimensional structural schematic diagram of the magneto cooling structure of the motorcycle engine.

[0026] Figure 4 yes Figure 3 Schematic diagram of the enlarged structure of part A in the middle.

[0027] Figure 5This is one of the three-dimensional structural schematic diagrams of the locking parts in the magneto cooling structure of the motorcycle engine.

[0028] Figure 6 This is the second schematic diagram of the three-dimensional structure of the locking member in the magneto cooling structure of the motorcycle engine.

[0029] Figure 7 The present invention is a schematic diagram of the three-dimensional structure of a gasket in the magneto cooling structure of the motorcycle engine.

[0030] In the figure, 1. crankshaft; 10. lubricating oil hole; 2. flywheel; 20. concave cavity; 21. mounting portion; 3. locking piece; 31. bolt; 31a. oil groove 1; 32. washer; 32a. oil groove 2; 32b. notch; 31c. connecting portion; 4. coil; 5. lubricating oil flow channel; 6. lubricating oil cavity; 7. gap. DETAILED DESCRIPTION

[0031] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments.

[0032] Example 1

[0033] like Figure 1 and Figure 3 As shown, the magneto cooling structure of the motorcycle engine includes a crankshaft 1 having a lubricating oil hole 10, a flywheel 2 sleeved on the crankshaft 1 and having a concave cavity 20, a locking member 3 passing through the lubricating oil hole 10 and positioning the flywheel 2 on the crankshaft 1, and a coil 4 disposed in the concave cavity 20. The locking member 3 includes a bolt 31 having one end threadedly connected to the lubricating oil hole 10 and a washer 32 sleeved on the bolt 31. The flywheel 2 has a mounting portion 21 sleeved on the crankshaft 1, and the washer 32 is pressed against the end surface of the mounting portion 21 by the bolt 31.

[0034] like Figures 1 to 7As shown, the magnetic motor cooling structure includes a lubricating oil flow channel 5 provided on the locking member 3. The lubricating oil flow channel 5 includes an oil inlet channel arranged along the axial direction of the locking member 3 and an oil outlet channel arranged along the radial direction of the locking member 3. The oil outlet channel is perpendicular to the axial direction of the crankshaft 1. The oil inlet of the oil inlet channel is connected to the lubricating oil hole 10, and the oil outlet of the oil inlet channel is connected to the oil inlet of the oil outlet channel. The oil outlet of the oil outlet channel faces the coil 4. In this embodiment, the oil inlet channel includes an oil groove 1 31a provided on the outer circumferential surface of the bolt 31. The oil inlet of the oil groove 1 31a is located on the end surface of one end of the bolt 31 passing through the lubricating oil hole 10. The oil outlet channel includes an oil groove 2 32a provided radially on the side surface of the washer 32. The oil inlet of the oil groove 2 32a is located on the inner circumferential surface of the washer 32, and the oil outlet of the oil groove 2 32a is located on the outer circumferential surface of the washer 32. When the engine is working, the crankshaft 1 rotates. During the rotation of the crankshaft 1, the lubricating oil enters the lubricating oil hole 10, and the oil groove 1 31a draws oil from the lubricating oil hole 10. The lubricating oil in the lubricating oil hole 10 enters the oil groove 1 31a. As the bolt 31 rotates synchronously with the crankshaft, the lubricating oil in the oil groove 1 31a is thrown out of the oil groove 1 31a, so that the lubricating oil enters the oil groove 2 32a. Since the oil groove 2 32a is arranged along the radial direction of the gasket 32, the gasket 32 rotates synchronously with the crankshaft. The lubricating oil in the oil groove 2 32a is thrown out outward in the circumferential direction under the action of centrifugal force, so that the lubricating oil is evenly thrown on the coil 4. When more lubricating oil is thrown onto the coil 4, the lubricating oil will drip from the coil 4 into the concave cavity 20, thereby taking away the heat of the coil 4, quickly and effectively cooling the coil 4, significantly improving the cooling effect of the coil 4, and reducing the risk of the coil 4 being burned.

[0035] like Figure 5 As shown, the oil groove 1 31a is a linear oil groove, and the oil groove 1 31a is inclined in the axial direction of the bolt 3, so that when the bolt 31 rotates with the crankshaft 1, the lubricating oil in the oil groove 1 31a is affected by the centrifugal force and flows along the inclined direction of the oil groove 1 31a, so that the lubricating oil can be quickly thrown out of the oil groove 1 31a, thereby increasing the flow speed of the lubricating oil, ensuring that the lubricating oil can be quickly thrown onto the coil 4, and improving the cooling effect on the coil 4.

[0036] like Figure 6 and Figure 7 As shown, oil groove 2 32a is provided on the side of washer 32 facing the head of bolt 3. A notch 32b is provided on the inner circumference of washer 32, and the oil inlet of oil groove 2 32a is connected to notch 32b. The provision of notch 32b allows lubricating oil from oil groove 1 31a to quickly enter oil groove 2 32a through the notch, ensuring a sufficient supply of lubricating oil to oil groove 2 32a and ensuring that sufficient lubricating oil is quickly thrown onto coil 4.

[0037] like Figure 1 and Figure 2 As shown, the lubricating oil flow channel 5 also includes a lubricating oil chamber 6. A gap exists between the outer circumference of the bolt 3 and the inner wall of the mounting portion 21, forming the lubricating oil chamber 6. The oil outlet of the first oil groove 31a is connected to the lubricating oil chamber 6, and the oil inlet of the second oil groove 32a is connected to the lubricating oil chamber 6. The lubricating oil chamber 6 serves to buffer and store the lubricating oil. Lubricating oil ejected from the first oil groove 31a first enters the lubricating oil chamber 6. Due to the large space in the lubricating oil chamber 6, the flow rate of the lubricating oil is reduced, thereby reducing the impact force on the bolt 31, making the bolt 31 less likely to loosen.

[0038] like Figure 1 、 Figure 2 and Figure 5 One end of the bolt 31 shown is radially expanded outward to form a connecting portion 31c, which is threadedly connected to the lubricating oil hole 10. An oil groove 1 31a is provided on the outer peripheral surface of the connecting portion 31c. A gap 7 is provided between the outer peripheral surface of the bolt 31 and the inner wall of the lubricating oil hole 10. A certain space is formed between the outer peripheral surface of the bolt 31 and the inner wall of the lubricating oil hole 10, and the space is connected to the lubricating oil cavity 6. The setting of the space reduces the flow rate of the lubricating oil flowing out of the oil groove 1 31a, so that the flow rate of the lubricating oil gradually decreases from the oil groove 1 31a to the oil groove 2 32a, further reducing the impact force on the gasket 32 and the bolt 31.

[0039] Example 2

[0040] The content of this embodiment is basically the same as that of the above-mentioned embodiment 1, with the difference being that the oil outlet passage in this embodiment is arranged to be inclined relative to the axial direction of the crankshaft 1 .

[0041] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope of the appended claims.

Claims

1. A magneto cooling structure for a motorcycle engine, the engine comprising a crankshaft (1) having a lubricating oil hole (10), a flywheel (2) sleeved on the crankshaft (1) and having a concave cavity (20), a locking member (3) passing through the lubricating oil hole (10) and positioning the flywheel (2) on the crankshaft (1), and a coil (4) disposed in the concave cavity (20), the magneto cooling structure comprising a lubricating oil flow channel (5) provided on the locking member (3), an oil inlet of the lubricating oil flow channel (5) being connected to the lubricating oil hole (10), and characterized in that: The direction of the oil outlet of the lubricating oil flow channel (5) is inclined or perpendicular to the axial direction of the crankshaft (1), and the oil outlet of the lubricating oil flow channel (5) faces the coil (4). The lubricating oil flow channel (5) includes an oil inlet flow channel arranged along the axial direction of the locking member (3) and an oil outlet flow channel arranged along the radial direction of the locking member (3). The locking member (3) includes a bolt (31) with one end screwed to the lubricating oil hole (10) and a washer (32) sleeved on the bolt (31). The flywheel (2) has a mounting portion (21) sleeved on the crankshaft (1). The washer (32) is pressed against the end face of the mounting portion (21) by the bolt (31). The oil inlet flow channel includes an oil groove (31a) opened on the outer peripheral surface of the bolt (31). The oil inlet of groove 1 (31a) is located on the end face of one end of the bolt (31) passing through the lubricating oil hole (10), and the oil outlet channel includes oil groove 2 (32a) radially opened on the side of the gasket (32), the oil inlet of oil groove 2 (32a) is located on the inner peripheral surface of the gasket (32), and the oil outlet of oil groove 2 (32a) is located on the outer peripheral surface of the gasket (32). The lubricating oil channel (5) also includes a lubricating oil cavity (6), the oil outlet of oil groove 1 (31a) is connected to the lubricating oil cavity (6), and the oil inlet of oil groove 2 (32a) is connected to the lubricating oil cavity (6). There is a distance between the outer peripheral surface of the bolt (3) and the inner wall of the mounting portion (21), and the lubricating oil cavity (6) is formed.

2. A cooling structure for a magneto of a motorcycle engine according to claim 1, characterized in that: The oil inlet of the oil inlet channel is connected to the lubricating oil hole (10), the oil outlet of the oil inlet channel is connected to the oil inlet of the oil outlet channel, and the oil outlet of the oil outlet channel faces the coil (4).

3. The cooling structure of a magneto of a motorcycle engine according to claim 1, characterized in that: The second oil groove (32a) is provided on the side of the washer (32) facing the head of the bolt (3), a notch (32b) is provided on the inner circumference of the washer (32), and the oil inlet of the second oil groove (32a) is connected to the notch (32b).

4. A cooling structure for a magneto of a motorcycle engine according to claim 1 or 3, characterized in that: The oil groove 1 (31a) is a linear oil groove, and the oil groove 1 (31a) is arranged obliquely in the axial direction of the bolt (3).

5. The cooling structure of a magneto of a motorcycle engine according to claim 4, characterized in that: One end of the bolt (31) is radially expanded outward to form a connecting portion (31c), and the connecting portion (31c) is threadedly connected to the lubricating oil hole (10). A gap (7) is provided between the outer peripheral surface of the bolt (31) and the inner wall of the lubricating oil hole (10), and the oil groove (31a) is provided on the outer peripheral surface of the connecting portion (31c).

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