Rotating speed detection mechanism of motorcycle engine

Abstract

The invention provides a rotating speed detection mechanism of a motorcycle engine, and belongs to the technical field of motorcycle engines. The problem that an existing rotating speed detection mechanism is troublesome to overhaul is solved. The engine comprises a box body, a main shaft and an auxiliary shaft are arranged in the box body, a rotating speed detection mechanism comprises a driving wheel fixedly connected to the main shaft, a driven wheel which is axially positioned and circumferentially rotatably arranged on the auxiliary shaft in a sleeving mode and a first rotating speed sensor fixedly connected to the box body, the driving wheel is meshed with the driven wheel, and the main shaft rotates to drive the driven wheel to rotate through the driving wheel; the first rotating speed sensor is used for detecting rotating speed of the driven wheel. The rotating speed detection mechanism of the motorcycle engine has the advantages that the space is reasonably utilized, the rotating speed sensor is reasonably arranged, and the rotating speed sensor is convenient to overhaul.

Description

Technical Field

[0001] The present invention belongs to the technical field of motorcycle engines and relates to a rotational speed detection mechanism for a motorcycle engine. Background Art

[0002] An engine is a power device that converts other forms of energy into kinetic energy and is a component device of vehicles such as automobiles and motorcycles.

[0003] For existing engines, for example, a Chinese patent document discloses an engine and its motorcycle [Patent No.: 202210160191.2; Application Publication No.: CN116677723A], which includes: a main shaft, an oil passage penetrating the main shaft is arranged inside the main shaft; a first gear of different gears is installed on the main shaft; a countershaft, a second gear of different gears is installed on the countershaft; the first gear meshes with the second gear; a clutch is installed at one end of the main shaft; a crankshaft drives the main shaft through the clutch; a throttle valve is installed in the oil passage; the throttle valve is arranged at one end of the oil passage close to the clutch.

[0004] For the engine of this structure, the shifting mechanism includes a first rotational speed sensor and a second rotational speed sensor. The first rotational speed sensor is electrically connected to an electronic control unit and is used to monitor the rotational speed of the main shaft. The second rotational speed sensor is electrically connected to the electronic control unit and is used to monitor the rotational speed of the output shaft, and the output shaft is the countershaft. However, for the engine of this structure, the main shaft, the output shaft, and the crankshaft are all located in the box body. The main shaft is arranged between the crankshaft and the output shaft, that is, the position of the main shaft is relatively at the center of the box body. After installing the engine into the motorcycle, the outer wall of the box body corresponding to the main shaft is located at a relatively inner position of the motorcycle. The first rotational speed sensor is installed on the box body and directly detects the main shaft. The first rotational speed sensor is relatively installed at a relatively inner position of the motorcycle. When the first rotational speed sensor fails and needs to be repaired, the box body needs to be removed, and then the first rotational speed sensor can be repaired or replaced. The repair of the first rotational speed sensor is troublesome. Summary of the Invention

[0005] The purpose of the present invention is to address the above problems existing in the prior art and propose a rotational speed detection mechanism for a motorcycle engine, and the technical problem to be solved is how to reasonably utilize space to make the arrangement of the rotational speed sensor reasonable and the repair of the rotational speed sensor convenient.

[0006] The object of the present invention can be achieved by the following technical solutions: A rotational speed detection mechanism for a motorcycle engine. The engine includes a box body, and a main shaft and a countershaft are arranged in the box body. It is characterized in that the rotational speed detection mechanism includes a driving wheel fixedly connected to the main shaft, a driven wheel sleeved on the countershaft axially positioned and circumferentially rotatable, and a first rotational speed sensor fixedly connected to the box body. The driving wheel and the driven wheel are meshed with each other. The rotation of the main shaft drives the driven wheel to rotate through the driving wheel. The first rotational speed sensor is used to detect the rotational speed of the driven wheel.

[0007] The rotation of the main shaft drives the driving wheel to rotate together. The driven wheel is sleeved on the countershaft axially positioned and circumferentially rotatable. The driving wheel drives the driven wheel to rotate. The rotation of the driven wheel will not affect the rotation of the countershaft. By detecting the rotational speed of the driven wheel with the first rotational speed sensor, the rotational speeds of the driving wheel and the main shaft can be judged, whether the rotational speed of the main shaft is reasonable can be judged, and whether the engine is working normally can be judged. The main shaft is located between the countershaft and the crankshaft. The position of the main shaft in the box body is relatively centered, and the position of the countershaft in the box body is relatively close to the side of the box body. Through the arrangement of the driving wheel and the driven wheel in this rotational speed detection mechanism, the rotational speed state of the main shaft is transferred from the center of the box body to the side of the box body. After the engine is installed in the motorcycle, the position of the first rotational speed sensor is located outside the motorcycle, enabling the operator to directly disassemble and assemble the first rotational speed sensor, making rational use of space, arranging the sensor reasonably, and facilitating the maintenance of the sensor. Both the driving wheel and the driven wheel are gears. Gear transmission is not easily damaged and does not require maintenance.

[0008] In the above-mentioned rotational speed detection mechanism for a motorcycle engine, the main shaft and the driving wheel are of an integral structure, and the outer diameter of the driven wheel is much larger than the outer diameter of the driving wheel. The driving wheel and the driven wheel are additional components for detecting the rotational speed of the main shaft. The small outer diameter of the driving wheel makes the setting of the driving wheel hardly affect the rotation of the main shaft. At the same time, since the driven wheel is sleeved on the countershaft circumferentially rotatable, the rotation of the driven wheel will not affect the countershaft, and the friction between the driven wheel and the countershaft is small enough, so the setting of the driven wheel hardly affects the rotation of the main shaft either, making the structure and arrangement of this rotational speed detection mechanism reasonable. The outer diameter of the driven wheel can be 5 - 10 times the outer diameter of the driving wheel.

[0009] In the above-mentioned rotational speed detection mechanism of a motorcycle engine, the rotational speed detection mechanism further includes a detection wheel fixedly connected to the auxiliary shaft and a second rotational speed sensor fixedly connected to the box body. The box body has a support wall. One end of the auxiliary shaft passes through the support wall. The driven wheel and the detection wheel are respectively located on both sides of the support wall. The rotation of the main shaft drives the detection wheel to rotate through the auxiliary shaft. The second rotational speed sensor is used to detect the rotational speed of the detection wheel. The inner ends of the first rotational speed sensor and the second rotational speed sensor both extend into the box body, and the inner ends of the first rotational speed sensor and the second rotational speed sensor are respectively located on both sides of the support wall.

[0010] The main shaft drives the auxiliary shaft to rotate through different gear ratios, realizing the change of the rotational speed of the auxiliary shaft. The detection wheel is fixedly connected to the auxiliary shaft, that is, the rotation of the auxiliary shaft drives the detection wheel to rotate together. The rotational speed of the detection wheel is detected by the second rotational speed sensor to judge whether the rotational speed of the auxiliary shaft is reasonable and whether the engine is working properly. The driven wheel and the detection wheel are respectively located on both sides of the support wall, and the inner ends of the first rotational speed sensor and the second rotational speed sensor are respectively located on both sides of the support wall. That is, the first rotational speed sensor and the second rotational speed sensor are separated by the support wall, so that the detections of the first rotational speed sensor and the second rotational speed sensor will not be interfered by other rotating objects, making the sensor arrangement reasonable and improving the detection accuracy.

[0011] In the above-mentioned rotational speed detection mechanism of a motorcycle engine, the box body and the support wall are of an integral structure. The integral structure is convenient for processing and has high firmness.

[0012] In the above-mentioned rotational speed detection mechanism of a motorcycle engine, both the driven wheel and the detection wheel are located at the end of one end of the auxiliary shaft, and both the driven wheel and the detection wheel are arranged adjacent to the support wall. This structure makes the arrangement of the driven wheel and the detection wheel compact, occupying a small space, and the setting of this rotational speed detection mechanism does not affect the installation of other components in the box body.

[0013] In the above-mentioned rotational speed detection mechanism of a motorcycle engine, the first rotational speed sensor and the second rotational speed sensor are arranged adjacent to each other, and both the first rotational speed sensor and the second rotational speed sensor are located on the front side wall or the rear side wall of the box body.

[0014] In the above-mentioned rotational speed detection mechanism of a motorcycle engine, a positioning portion protruding outward along the axial direction of the detection wheel is provided at the center on one side of the detection wheel. One end of the auxiliary shaft is hollow, and the positioning portion is partially embedded and positioned in one end of the auxiliary shaft, so that the detection wheel is coaxially arranged with the auxiliary shaft. This structure enables the setting of the detection wheel not to affect the installation of the gear ratios on the auxiliary shaft, and ensures the coaxiality of the detection wheel and the auxiliary shaft, improving the detection accuracy of the rotational speed detection mechanism.

[0015] In the above-mentioned rotational speed detection mechanism of a motorcycle engine, there is a gap between the detection wheel and the support wall. The setting of the gap has two purposes. First, it avoids the interference of the support wall on the rotation of the detection wheel, improves the accuracy of the rotation of the detection wheel, and thus improves the detection accuracy of the rotational speed detection mechanism. Second, lubricating oil can enter between the support wall and the auxiliary shaft through this gap, enabling the smooth rotation of the auxiliary shaft and the detection wheel, improving the accuracy of the rotation of the detection wheel, and enhancing the detection accuracy of the rotational speed detection mechanism.

[0016] In the above-mentioned rotational speed detection mechanism of a motorcycle engine, there is an annular retaining edge on the outer peripheral wall of the auxiliary shaft. A first gasket and a second gasket are also sleeved on the auxiliary shaft. One side of the driven wheel abuts against the annular retaining edge through the first gasket, and the other side of the driven wheel abuts against the support wall through the second gasket, axially positioning the driven wheel on the auxiliary shaft. A first bearing is provided between the driven wheel and the auxiliary shaft, enabling the driven wheel to be circumferentially rotatably sleeved on the auxiliary shaft. This structure axially positions the driven wheel and circumferentially rotatably sleeves it on the auxiliary shaft, with a simple and compact structure.

[0017] In the above-mentioned rotational speed detection mechanism of a motorcycle engine, there is a second bearing between the auxiliary shaft and the support wall, and the second bearing is entirely located within the support wall. The setting of the second bearing enables the smooth rotation of the auxiliary shaft and the detection wheel.

[0018] Compared with the prior art, the rotational speed detection mechanism of a motorcycle engine provided by the present invention has the following advantages:

[0019] 1. Through the arrangement of the driving wheel and the driven wheel, this rotational speed detection mechanism transfers the rotational speed state of the main shaft from the center of the engine block to the side of the engine block. After the engine is installed in the motorcycle, the position of the first rotational speed sensor is located outside the motorcycle, enabling the operator to directly disassemble and assemble the first rotational speed sensor, making rational use of space, arranging the sensors reasonably, and facilitating the maintenance of the sensors.

[0020] 2. The driven wheel and the detection wheel of this rotational speed detection mechanism are respectively located on both sides of the support wall, and the inner ends of the first rotational speed sensor and the second rotational speed sensor are respectively located on both sides of the support wall. That is, the first rotational speed sensor and the second rotational speed sensor are separated by the support wall, preventing the detections of the first rotational speed sensor and the second rotational speed sensor from being interfered by other rotating objects, arranging the sensors reasonably, and improving the detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic structural diagram of the engine block of this engine.

[0022] Figure 2This is a cross-sectional view of the overall structure of the rotational speed detection mechanism.

[0023] Figure 3 This is a schematic diagram of the position of the sensor of the rotational speed detection mechanism.

[0024] Figure 4 This is a schematic diagram of the arrangement of the driving wheel and the driven wheel of the rotational speed detection mechanism.

[0025] Figure 5 This is a schematic diagram of the arrangement of the detection wheel of the rotational speed detection mechanism.

[0026] In the figure, 1 is the box body; 2 is the main shaft; 3 is the auxiliary shaft; 31 is the annular retaining edge; 4 is the driving wheel; 5 is the driven wheel; 6 is the first rotational speed sensor; 7 is the detection wheel; 71 is the positioning part; 8 is the second rotational speed sensor; 9 is the support wall; 10 is the first gasket; 11 is the second gasket; 12 is the first bearing; 13 is the second bearing. Detailed implementation manners

[0027] The following are specific embodiments of the present invention and in combination with the accompanying drawings, the technical solutions of the present invention are further described, but the present invention is not limited to these embodiments.

[0028] As Figure 1 , Figure 2 shown, the motorcycle engine includes a box body 1, a main shaft 2, an auxiliary shaft 3 and a rotational speed detection mechanism. The main shaft 2 and the auxiliary shaft 3 are both arranged in the box body 1, and the rotational speed detection mechanism includes a driving wheel 4, a driven wheel 5, a first rotational speed sensor 6, a detection wheel 7 and a second rotational speed sensor 8.

[0029] The driving wheel 4 is fixedly connected to the main shaft 2, the main shaft 2 and the driving wheel 4 are of an integral structure, the driven wheel 5 is axially positioned and circumferentially rotatably sleeved on the auxiliary shaft 3, the driving wheel 4 and the driven wheel 5 are meshed with each other, the outer diameter of the driven wheel 5 is much larger than the outer diameter of the driving wheel 4, the detection wheel 7 is fixedly connected to the auxiliary shaft 3, the first rotational speed sensor 6 is fixedly connected to the box body 1, and the second rotational speed sensor 8 is fixedly connected to the box body 1. In this embodiment, both the first rotational speed sensor 6 and the second rotational speed sensor 8 are located on the front side wall of the box body 1. In actual production, both the first rotational speed sensor 6 and the second rotational speed sensor 8 can be located on the rear side wall of the box body 1.

[0030] As Figure 3 shown, the box body 1 has a support wall 9, and the box body 1 and the support wall 9 are of an integral structure. One end of the auxiliary shaft 3 passes through the support wall 9, and there is a second bearing 13 between the auxiliary shaft 3 and the support wall 9, and the second bearing 13 is entirely located in the support wall 9. Both the driven wheel 5 and the detection wheel 7 are located at the end of one end of the auxiliary shaft 3. As Figure 4 , Figure 5As shown, the driven wheel 5 and the detection wheel 7 are respectively located on both sides of the support wall 9. The driven wheel 5 and the detection wheel 7 are both arranged adjacent to the support wall 9. The first rotational speed sensor 6 and the second rotational speed sensor 8 are arranged adjacent to each other. The inner ends of the first rotational speed sensor 6 and the second rotational speed sensor 8 both extend into the box body 1, and the inner ends of the first rotational speed sensor 6 and the second rotational speed sensor 8 are respectively located on both sides of the support wall 9.

[0031] An annular retaining edge 31 is provided on the outer peripheral wall of the countershaft 3. A first gasket 10 and a second gasket 11 are also sleeved on the countershaft 3. One side of the driven wheel 5 abuts against the annular retaining edge 31 through the first gasket 10, and the other side of the driven wheel 5 abuts against the support wall 9 through the second gasket 11, so that the driven wheel 5 is axially positioned on the countershaft 3. A first bearing 12 is provided between the driven wheel 5 and the countershaft 3, and the first bearing 12 enables the driven wheel 5 to be sleeved on the countershaft 3 rotatably in the circumferential direction.

[0032] At the center of one side of the detection wheel 7, a positioning portion 71 protruding axially outward along the detection wheel 7 is provided. One end of the countershaft 3 is hollow, and the positioning portion 71 is partially embedded and positioned in one end of the countershaft 3, so that the detection wheel 7 is coaxially arranged with the countershaft 3, and there is a gap between the detection wheel 7 and the support wall 9.

[0033] During detection, the main shaft 2 rotates. The rotation of the main shaft 2 drives the driven wheel 5 to rotate through the driving wheel 4. The first rotational speed sensor 6 detects the rotational speed of the driven wheel 5. The rotation of the main shaft 2 drives the detection wheel 7 to rotate through the countershaft 3. The second rotational speed sensor 8 detects the rotational speed of the detection wheel 7. The central control of the motorcycle determines whether the rotational speeds of the main shaft 2 and the countershaft 3 are normal according to the data detected by the first rotational speed sensor 6 and the second rotational speed sensor 8, and determines whether the engine is working properly.

[0034] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the technical field to which the present invention pertains can make various modifications or supplements to the described specific embodiments or use similar ways to replace them, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0035] Although terms such as box body 1, main shaft 2, countershaft 3, annular retaining edge 31, driving wheel 4, driven wheel 5, first rotational speed sensor 6, detection wheel 7, positioning portion 71, second rotational speed sensor 8, support wall 9, first gasket 10, second gasket 11, first bearing 12, second bearing 13, etc. are used more in this article, the possibility of using other terms is not excluded. Using these terms is only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional limitation is contrary to the spirit of the present invention.

Claims

1. A rotational speed detection mechanism for a motorcycle engine, the engine comprising a box body (1), wherein a main shaft (2) and a countershaft (3) are arranged inside the box body (1), and it is characterized in that, The rotational speed detection mechanism includes a driving wheel (4) fixedly connected to the main shaft (2), a driven wheel (5) sleeved on the auxiliary shaft (3) with axial positioning and circumferential rotation, and a first rotational speed sensor (6) fixedly connected to the box body (1). The driving wheel (4) and the driven wheel (5) are meshed with each other. The rotation of the main shaft (2) drives the driven wheel (5) to rotate through the driving wheel (4). The first rotational speed sensor (6) is used to detect the rotational speed of the driven wheel (5).

2. The rotational speed detection mechanism of a motorcycle engine according to claim 1, characterized in that, The main shaft (2) and the driving wheel (4) are of an integral structure, and the outer diameter of the driven wheel (5) is much larger than that of the driving wheel (4).

3. A rotational speed detection mechanism for a motorcycle engine according to claim 1 or 2, characterized in that, The rotational speed detection mechanism further includes a detection wheel (7) fixedly connected to the auxiliary shaft (3) and a second rotational speed sensor (8) fixedly connected to the box body (1). A support wall (9) is provided in the box body (1). One end of the auxiliary shaft (3) passes through the support wall (9). The driven wheel (5) and the detection wheel (7) are respectively located on both sides of the support wall (9). The rotation of the main shaft (2) drives the detection wheel (7) to rotate through the auxiliary shaft (3). The second rotational speed sensor (8) is used to detect the rotational speed of the detection wheel (7). The inner ends of the first rotational speed sensor (6) and the second rotational speed sensor (8) both extend into the box body (1), and the inner ends of the first rotational speed sensor (6) and the second rotational speed sensor (8) are respectively located on both sides of the support wall (9).

4. The rotational speed detection mechanism of a motorcycle engine according to claim 3, characterized in that, The box body (1) and the support wall (9) are of an integral structure.

5. The rotational speed detection mechanism of a motorcycle engine according to claim 3, characterized in that, Both the driven wheel (5) and the detection wheel (7) are located at the end of one end of the auxiliary shaft (3), and both the driven wheel (5) and the detection wheel (7) are arranged adjacent to the support wall (9).

6. The rotational speed detection mechanism of a motorcycle engine according to claim 3, characterized in that, The first rotational speed sensor (6) and the second rotational speed sensor (8) are arranged adjacent to each other, and both the first rotational speed sensor (6) and the second rotational speed sensor (8) are located on the front side wall or the rear side wall of the box body (1).

7. The rotational speed detection mechanism of a motorcycle engine according to claim 3, characterized in that A positioning portion (71) protruding axially outward along the detection wheel (7) is provided at the center on one side of the detection wheel (7). One end of the auxiliary shaft (3) is hollow, and the positioning portion (71) is partially embedded and positioned in one end of the auxiliary shaft (3) to make the detection wheel (7) coaxially arranged with the auxiliary shaft (3).

8. The rotational speed detection mechanism of a motorcycle engine according to claim 3, wherein, A gap is provided between the detection wheel (7) and the support wall (9).

9. The rotational speed detection mechanism of a motorcycle engine according to claim 3, characterized in that, The outer peripheral wall of the auxiliary shaft (3) is provided with an annular stop edge (31). A first gasket (10) and a second gasket (11) are also sleeved on the auxiliary shaft (3). One side of the driven wheel (5) abuts against the annular stop edge (31) through the first gasket (10), and the other side of the driven wheel (5) abuts against the support wall (9) through the second gasket (11), so that the driven wheel (5) is axially positioned on the auxiliary shaft (3). A first bearing (12) is arranged between the driven wheel (5) and the auxiliary shaft (3), and the first bearing (12) enables the driven wheel (5) to be rotatably sleeved on the auxiliary shaft (3) in the circumferential direction.

10. The rotational speed detection mechanism of a motorcycle engine according to claim 3, characterized in that, A second bearing (13) is arranged between the auxiliary shaft (3) and the support wall (9), and the second bearing (13) is entirely located in the support wall (9).

Images