JP2014069665A - Mounting structure of vehicle speed sensor of motorcycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To protect a vehicle speed sensor fitted to the top face of a crankcase while decreasing the number of parts by eliminating the need of a special protective cover in a motorcycle in which the top face of the crankcase in the rear of a cylinder block is provided with a motor storing recessed part for storing a part of a starter motor, and provided with a sensor mounting seat for mounting the vehicle sensor disposed opposite to the outer periphery of a specific gear of a gear transmission mechanism, and a sprocket cover is fitted to one side surface of the crankcase.SOLUTION: In the rear of a motor storing recessed part 45, the top face of a crankcase 19 is provided with a sensor mounting recessed part 55 opened to one side surface of the crankcase 19 with a sensor mounting seat 47 formed at the inner end part, and a vehicle speed sensor 46 is liquid-tightly mounted to the sensor mounting seat 47 to be covered from the surroundings with the starter motor 44, the sprocket cover 43 and the side wall of the sensor mounting recessed part 55.

Description

  According to the present invention, an engine body including a crankcase that rotatably supports a crankshaft and a cylinder block that is coupled to a front portion of the crankcase and rises upward is mounted on a vehicle body frame, and is freely rotatable by the crankcase. A drive in which a gear transmission mechanism capable of transmitting the rotational power from the crankshaft in a stepwise manner to the accommodated transmission output shaft is housed in the crankcase, and a drive chain for transmitting the power to the rear wheels is wound around A sprocket is provided at a protruding end portion of the transmission output shaft from one side surface of the crankcase, and houses a part of a starter motor attached to the crankcase on the upper surface of the crankcase behind the cylinder block. A motor housing recess is provided, and a specific gear of the gear transmission mechanism is The present invention relates to a motorcycle in which a sensor mounting seat for mounting a vehicle speed sensor arranged opposite to the circumference is formed, and a sprocket cover that covers the drive sprocket is mounted on the one side surface of the crankcase, and more particularly to an improvement in the mounting structure of the vehicle speed sensor. .

  A motorcycle is known in Patent Document 1 in which a starter motor is attached to the upper surface of a crankcase behind a cylinder block, and a vehicle speed sensor is attached to the upper surface of the crankcase behind the starter motor.

JP 2009-67336 A

  By the way, the upper part of the crankcase mounted on the motorcycle is often a relatively wide open space, and in order to protect the vehicle speed sensor from stones, muddy water, etc. that are scattered as the motorcycle travels, There are restrictions on the mounting position of the vehicle speed sensor on the upper surface of the cylinder, and as disclosed in Patent Document 1, the vehicle speed sensor is attached to the upper surface of the crankcase at the rear of the cylinder block at the substantially central portion or the vehicle speed sensor is protected. Measures such as providing a protective cover are taken.

  SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and mounting a vehicle speed sensor in a motorcycle that can protect a vehicle speed sensor mounted on the upper surface of the crankcase while reducing the number of parts by eliminating the need for a dedicated protective cover. The purpose is to provide a structure.

  In order to achieve the above object, according to the present invention, an engine body including a crankcase that rotatably supports a crankshaft and a cylinder block that is coupled to a front portion of the crankcase and rises upward is mounted on a vehicle body frame. A gear speed change mechanism capable of transmitting the rotational power from the crankshaft in a stepwise manner to a speed change output shaft that is rotatably accommodated in the crankcase is housed in the crankcase and transmits power to the rear wheels. A drive sprocket around which a drive chain is wound is provided at a protruding end portion of the transmission output shaft from one side surface of the crankcase, and is attached to the crankcase on the upper surface of the crankcase behind the cylinder block. A motor housing recess for housing a part of the starter motor is provided, and In the motorcycle, a sensor mounting seat for mounting a vehicle speed sensor disposed opposite to an outer periphery of a specific gear of the vehicle transmission mechanism is formed, and a sprocket cover that covers the drive sprocket is mounted on the one side surface of the crankcase. A sensor mounting recess that is opened on the one side surface of the crankcase so as to form the sensor mounting seat at the inner end on the upper surface of the crankcase behind the motor housing recess, and the vehicle speed sensor is A first feature is that the starter motor, the sprocket cover, and the sensor mounting recess are covered with the side walls of the sensor mounting seat in a liquid-tight manner.

  According to the present invention, in addition to the configuration of the first feature, the sensor mounting recess with the sensor mounting seat positioned above the bottom of the motor receiving recess opens to the front of the motor receiving recess. The second feature is to be formed.

  The third feature of the present invention is that, in addition to the configuration of the first or second feature, the sensor mounting seat is formed to be inclined rearwardly.

  According to the present invention, in addition to any of the first to third characteristics, the motor housing recess constitutes a part of a gear transmission mechanism provided between the starter motor and the crankshaft, and the starter motor A pinion provided on the output shaft is disposed at a position where the gear transmission mechanism is established to be fastened to the crankcase, and the fastening to the crankcase is released to release the pinion from the gear transmission mechanism. The starter motor is configured to be able to slide in the axial direction between the positions, and the output shaft of the starter motor is disposed on the vehicle speed sensor side in the direction along the axis of the crankshaft. It is characterized by.

  In addition to the fourth feature of the present invention, the chain tensioner for tensioning the cam chain partially corresponds to the starter motor in a plan view and corresponds to the vehicle speed sensor in a direction along the axis of the crankshaft. A fifth feature is that the cylinder block is attached to the rear side wall of the cylinder block at a position where

  According to the first aspect of the present invention, a sensor mounting recess located at the rear of the motor housing recess on the upper surface of the crankcase forms a sensor mounting seat at the inner end, and one side surface of the crankcase on the drive sprocket side. A starter motor in which a vehicle speed sensor is partially housed in the motor housing recess, a sprocket cover that covers the drive sprocket and is attached to one side of the crankcase, and a side wall of the sensor mounting recess. In this case, the vehicle speed sensor can be mounted on the upper surface of the crankcase so as to be protected with a simple structure that does not require a dedicated protective cover.

  Further, according to the second feature of the present invention, the sensor mounting recess opens to the front motor receiving recess, so that the vehicle speed sensor can be easily maintained by removing the starter motor from the crankcase. In addition, since the sensor mounting seat is located above the bottom of the motor housing recess, the vehicle speed sensor can be protected from rainwater that has entered the motor housing recess.

  According to the third aspect of the present invention, since the sensor mounting seat is inclined downwardly, rainwater that has entered the sensor mounting recess is collected at the rear of the sensor mounting recess, and is cranked by inertia during motorcycle travel. It can be discharged efficiently from one side of the case.

  According to the fourth aspect of the present invention, the starter motor includes a position where a pinion provided on the output shaft of the starter motor is disposed at a position where the gear transmission mechanism is established and fastened to the crankcase, It is possible to slide in the motor housing recess between the position where the fastening is released and the pinion is removed from the gear transmission mechanism, but the starter motor output shaft is in a direction along the axis of the crankshaft. Therefore, when the starter motor slides, only the portion where the axial length of the starter motor is extremely small moves in front of the vehicle speed sensor, and the starter motor can be moved smoothly.

  Further, according to the fifth aspect of the present invention, the chain tensioner attached to the rear side wall of the cylinder block partially overlaps the starter motor in a plan view and is located at a position corresponding to the vehicle speed sensor in the direction along the axis of the crankshaft. Therefore, when the starter motor is attached / detached, the chain tensioner suppresses the vertical displacement of the starter motor, thereby preventing the starter motor from hitting the vehicle speed sensor.

1 is a side view of a motorcycle. It is a side view of an engine body. It is a perspective view which shows a part of engine body. FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. FIG. 5 is a sectional view taken along line 5-5 of FIG.

  Embodiments of the present invention will be described with reference to FIGS. In the following description, front and rear, left and right, and top and bottom refer to directions viewed from a passenger who rides a motorcycle.

  First, in FIG. 1, a front fork 12 that pivotally supports a front wheel WF is supported so as to be steerable on a head pipe 11 at a front end portion of a body frame F of the motorcycle. The front end portion of the swing arm 13 that pivotally supports the rear wheel WR at the rear end portion is supported on the pivot frame 14 that the vehicle body frame F has in the middle in the front-rear direction so as to be swingable via the support shaft 15. .

  An engine body 16 of an engine E is mounted on the body frame F so as to be disposed between the front wheel WF and the rear wheel WR, and a fuel tank 17 disposed above the engine body 16; A riding seat 18 disposed behind the fuel tank 17 is supported by the vehicle body frame F.

  The engine body 16 is coupled to a crankcase 19 formed by combining a left crankcase half 19a and a right crankcase half 19b, and is coupled to a front portion of the crankcase 19 so as to be inclined slightly upward. A cylinder block 20 that rises upward, a cylinder head 21 that is coupled to the top of the cylinder block 20, and a head cover 22 that is coupled to the cylinder head 21 are provided.

  In FIG. 4, a crankshaft 23 having an axis extending in the vehicle width direction is rotatably supported on the crankcase 19. A piston (not shown) is slidably fitted to a cylinder bore 24 provided in the cylinder block 20, and the piston is connected to the crankshaft 23 via a connecting rod 25 and a crankpin 26.

  An outer rotor 27 is fixed to an end portion of the crankshaft 23 that protrudes outward from the left side wall of the crankcase 19, and an inner stator 28 that constitutes a generator 29 together with the outer rotor 27 is connected to the generator 29. It is attached to the generator cover 24 that is fastened to the left side wall of the crankcase 19 so as to cover it.

  In the crankcase 19, the power from the crankshaft 23 is shifted stepwise by a shift output shaft 32 having an axis parallel to the crankshaft 23 and rotatably supported by the crankcase 19. A gear transmission mechanism 33 for transmission is accommodated.

  The gear transmission mechanism 33 has a transmission input shaft 31 having an axis parallel to the crankshaft 23 and rotatably supported by the crankcase 19, and the transmission output shaft 32 having an axis parallel to the transmission input shaft 31. Are provided with a plurality of shift stages, for example, five stages of first to fifth gear trains G1 to G5 that can alternatively be established.

  Between the crankshaft 23 and the right end portion of the shift input shaft 31 protruding from the right crankcase half 19b of the crankcase 19, a primary gear reduction mechanism 34, a damper spring 35, and a multi-plate clutch 36 are provided. When the multi-plate clutch 36 is in a power transmission state, rotational power from the crankshaft 34 is input to the transmission input shaft 31 via the primary gear reduction mechanism 34, the damper spring 35 and the multi-plate clutch 36. . A clutch cover 37 covering the multi-plate clutch 36 is fastened to the right crankcase half 19b.

  A drive sprocket 40 is provided at the projecting end of the transmission output shaft 32 from the left crankcase half 19 a in the crankcase 19. On the other hand, as shown in FIG. 1, a driven sprocket 41 is provided on the rear wheel WR, and an endless drive chain 42 is wound around the drive sprocket 40 and the driven sprocket 41. In addition, a sprocket cover 43 that covers the drive sprocket 40 from the side is attached to one side of the crankcase 19, that is, the outer side of the left crankcase body 19a in this embodiment.

  Referring also to FIG. 5, a motor accommodating recess 45 for accommodating a part of a starter motor 44 attached to the crankcase 19 is provided on the upper surface of the crankcase 19 behind the cylinder block 20. A sensor mounting seat 47 is formed for mounting a vehicle speed sensor 46 disposed opposite to the outer periphery of a specific gear of the gear transmission mechanism 33. Thus, in this embodiment, the specific gear that makes the vehicle speed sensor 46 face the outer periphery is a drive gear 47 that constitutes a part of the fifth side gear train G5 and is fixed to the transmission input shaft 31. is there.

  Between the starter motor 44 and the left crankcase half 19a of the crankcase 19 and the crankshaft 23 between the generators 29, a pinion 50 provided on an output shaft 49 of the starter motor 44, A driven gear 51 having a one-way clutch 54 interposed between the outer rotor 27 of the generator 29 fixed to the crankshaft 23, and an intermediate gear interposed between the pinion 50 and the driven gear 51 ( A gear transmission mechanism 53 is provided.

  On the upper surface of the left crankcase half 19a of the crankcase 19 behind the motor housing recess 45, the sensor mounting seat 47 is formed at the inner end and opened to the left side of the crankcase 19. A sensor mounting recess 55 is provided, and an outer end of an insertion hole 56 through which the vehicle speed sensor 46 is inserted to face the outer periphery of the drive gear 48 is opened in the sensor mounting seat 47.

  The vehicle speed sensor 46 is liquid-tightly attached to the sensor mounting seat 47 with a bolt 58 so that an endless seal member 57 is interposed between the sensor mounting seat 47 and the sensor mounting seat 47. The vehicle speed sensor 46 is covered from the periphery by the side walls of the starter motor 44, the sprocket cover 43, and the sensor mounting recess 55 while being attached to the seat 47.

  The sensor mounting recess 55 is formed so that the sensor mounting seat 47 at the inner end thereof is positioned higher than the bottom of the motor receiving recess 45 and opens toward the motor receiving recess 45 in front of the sensor mounting recess 45. The Moreover, the sensor mounting seat 47 is formed so as to be inclined rearwardly.

  The motor housing recess 45 is disposed at a position where the pinion 50 provided on the output shaft 49 of the starter motor 44 is meshed with the intermediate gear of the gear transmission mechanism 53 to establish the gear transmission mechanism 53. As shown by the solid line in FIG. 3, the position where the bolt 59 is fastened, and the position where the fastening to the crankcase 19 is released and the pinion 50 is removed from the gear transmission mechanism 53 (in FIG. The starter motor 44 is configured to be slidable in the axial direction, and the output shaft 49 of the starter motor 44 is connected to the vehicle speed sensor 46 in a direction along the axis of the crankshaft 23. Placed on the side.

  A drive sprocket 60 is fixed to the crankshaft 23 between the left crankcase half 19a and the driven gear 51 of the gear transmission mechanism 53. The drive sprocket 60 and the drive sprocket 60 are wound around the crankshaft 23. A timing transmission mechanism 62 including a cam chain 61 is provided between the crankshaft 23 and a camshaft (not shown) rotatably supported by the cylinder head 21. A chain tensioner 63 is attached to the rear side wall of the cylinder block 20 with bolts 64, 64 to slidably contact the outer surface of the slack side 61 and tension the cam chain 61.

  Moreover, the chain tensioner 63 partially overlaps the starter motor 44 in a plan view and is disposed at a position corresponding to the vehicle speed sensor 46 in a direction along the axis of the crankshaft 23.

  Next, the operation of this embodiment will be described. The sensor mounting seat 47 is formed at the inner end portion on the upper surface of the crankcase 19 behind the motor housing recess 45 and is opened to the sprocket cover 43 side of the crankcase 19. The sensor mounting recess 55 is provided, and the vehicle speed sensor 46 is liquid-tightly mounted on the sensor mounting seat 47 so as to be covered from the periphery by the side walls of the starter motor 44, the sprocket cover 43 and the sensor mounting recess 55. The vehicle speed sensor 46 can be attached to the upper surface of the crankcase 19 so as to be protected with a simple structure that does not require a dedicated protective cover.

  Further, since the sensor mounting recess 55 is formed so as to open facing the motor housing recess 45 in front of it, the vehicle speed sensor 46 can be easily maintained by removing the starter motor 44 from the crankcase 19. In addition, since the sensor mounting seat 47 is located above the bottom of the motor housing recess 45, the vehicle speed sensor 46 can be protected from rainwater that has entered the motor housing recess 45.

  Moreover, since the sensor mounting seat 47 is formed so as to be inclined rearwardly, rainwater that has entered the sensor mounting recess 55 is collected in the rear portion of the sensor mounting recess 55, and the inertia of the crankcase 19 is increased due to inertia during motorcycle travel. It can be discharged efficiently from one side.

  The motor housing recess 45 constitutes a part of the gear transmission mechanism 53 provided between the starter motor 44 and the crankshaft 23, and the pinion 50 provided on the output shaft 49 of the starter motor 44 establishes the gear transmission mechanism 53. The starter motor 44 can be slid in the axial direction between a position where the starter motor 44 is fastened to the crankcase 19 and a position where the fastening to the crankcase 19 is released and the pinion 50 is released from the gear transmission mechanism 53. Since the output shaft 49 of the starter motor 44 is disposed on the vehicle speed sensor 46 side along the axis of the crankshaft 23, the axial length of the starter motor 44 is reduced when the starter motor 44 slides. Only a very small portion moves in front of the vehicle speed sensor 46, and the starter motor 44 is smoothed. It can be moved to's.

  Further, a chain tensioner 63 for tensioning the cam chain 61 partially overlaps the starter motor 44 in a plan view and at a position corresponding to the vehicle speed sensor 46 in a direction along the axis of the crankshaft 23, Therefore, when the starter motor 44 is attached / detached, the vertical displacement of the starter motor 44 is suppressed by the chain tensioner 63, thereby preventing the starter motor 44 from hitting the vehicle speed sensor 46.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various design changes can be made without departing from the present invention described in the claims. Is possible.

16 ... Engine body 19 ... Crankcase 20 ... Cylinder block 23 ... Crankshaft 32 ... Shifting output shaft 33 ... Gear transmission mechanism 40 ... Drive sprocket 42 ... Drive chain 43 ... Sprocket cover 44 ... Starter motor 45 ... Motor housing recess 46 ... Vehicle speed sensor 47 ... Sensor mounting seat 48 ... Specification gear drive gear 49 ... Output shaft 50 ... Pinion 53 ... Gear transmission mechanism 55 ... Sensor mounting recess 61 ... Cam chain 63 ... Chain tensioner F ... Body frame WR ... Rear wheel

Claims (5)

  An engine body (16) comprising a crankcase (19) that rotatably supports the crankshaft (23) and a cylinder block (20) that is coupled to the front portion of the crankcase (19) and rises upward is a vehicle body frame. A gear transmission mechanism mounted on (F) and capable of transmitting the rotational power from the crankshaft (23) in a stepwise manner to the transmission output shaft (32) rotatably accommodated in the crankcase (19). (33) is housed in the crankcase (19), and a drive sprocket (40) around which a drive chain (42) for transmitting power to the rear wheel (WR) is wound is provided on one side of the crankcase (19). The upper surface of the crankcase (19) is provided at the protruding end of the transmission output shaft (32) from the rear of the cylinder block (20). A motor accommodating recess (45) for accommodating a part of the starter motor (44) attached to the crankcase (19) is provided, and is opposed to the outer periphery of the specific gear (48) of the gear transmission mechanism (33). A sensor mounting seat (47) for mounting a vehicle speed sensor (46) arranged in the above manner is formed, and a sprocket cover (43) covering the drive sprocket (40) is mounted on the one side surface of the crankcase (19). In the two-wheeled vehicle, the one side surface of the crankcase (19) is formed such that the sensor mounting seat (47) is formed at an inner end on the upper surface of the crankcase (19) behind the motor housing recess (45). An open sensor mounting recess (55) is provided on the vehicle, and the vehicle speed sensor (46) is connected to the starter motor (44) and the sprocket. A vehicle speed sensor mounting structure in a motorcycle, characterized in that the socket cover (43) and side walls in so as to be covered from the periphery of the sensor mounting recess (55) is attached in a liquid tight manner to the sensor mounting seat (47).   The sensor mounting recess (55) with the sensor mounting seat (47) positioned above the bottom of the motor receiving recess (45) is formed to open toward the motor receiving recess (45) in front of the sensor mounting recess (45). The vehicle speed sensor mounting structure for a motorcycle according to claim 1, wherein the vehicle speed sensor mounting structure is used.   The vehicle speed sensor mounting structure for a motorcycle according to claim 1 or 2, wherein the sensor mounting seat (47) is formed to be inclined rearwardly.   The motor accommodating recess (45) constitutes a part of a gear transmission mechanism (53) provided between the starter motor (44) and the crankshaft (23) to form an output shaft (49) of the starter motor (44). The pinion (50) provided on the crankcase (19) is disposed at a position where the gear transmission mechanism (53) is established, and the fastening to the crankcase (19) is released. The starter motor (44) is formed so as to be slidable in the axial direction between the gear transmission mechanism (53) and the position where the pinion (50) is separated from the gear transmission mechanism (53). 49) is arranged on the vehicle speed sensor (46) side in a direction along the axis of the crankshaft (23). A vehicle speed sensor mounting structure in a motorcycle.   A chain tensioner (63) for tensioning the cam chain (61) partially overlaps the starter motor (44) in plan view and corresponds to the vehicle speed sensor (46) in a direction along the axis of the crankshaft (23). The mounting structure of the vehicle speed sensor in the motorcycle according to claim 4, wherein the mounting structure is attached to a rear side wall of the cylinder block (20) at a position where the vehicle is mounted.

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