JP2019120400A - Change gear - Google Patents

Abstract

To provide a change gear with easy work when attaching and detaching a shift spindle sensor and a shift drum sensor and excellent maintainability, and easy processing of each seating face of the shift spindle sensor and the shift drum sensor and excellent processing workability.SOLUTION: A shift spindle sensor (55) is set inside a spindle sensor penetration hole (23Bh) formed on a spindle sensor fitting seat (23B) formed at a prescribed part of a case member (23); a shift drum sensor (48) is set inside a drum sensor penetration hole (23Ah) formed on a drum sensor fitting seat (23A) formed at a prescribed part of the case member (23); and the direction in which the shift spindle sensor (55) of the spindle sensor penetration hole (23Bh) is pierced and the direction in which the shift drum sensor (48) of the drum sensor penetration hole (23Ah) is pierced are the same.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a transmission incorporated in a power unit mounted on a small vehicle.

  This type of transmission generally includes a constant mesh transmission, which rotates the shift spindle by shift operation and transmits the rotation of the shift spindle to intermittent rotation of the shift drum by the shift drum drive mechanism, The rotation of the shift drum moves the shift fork in the axial direction, and the shift fork moves the shift gear of the transmission to select a shift gear pair that works effectively among the plurality of shift gear pairs meshing with each other, as desired Configure the gear of.

  In such a transmission, a neutral switch for detecting the rotation of the shift drum and a shifter switch for detecting the rotation of the shift spindle (a shift switch for detecting whether the transmission is in the neutral state or not) can be determined. There is an example (for example, refer patent document 1) of the transmission provided with the spindle sensor.

Patent No. 6069774

  In the transmission disclosed in Patent Document 1, a neutral switch (shift drum sensor) for detecting a neutral rotational position of the shift drum is a rear wall of an upper case half (upper crankcase) facing the outer periphery of the shift drum. It is attached to the department.

  However, although the shifter switch (shift spindle sensor) for detecting the rotational position of the shift spindle is shown in the configuration diagram of the transmission control system (FIG. 6), the side view (FIG. 2) or the top view of the power unit Not shown in FIG.

  Referring to FIGS. 2 and 3 of Patent Document 1, since the neutral switch S4 is attached to the rear surface 32b of the upper case half 32 from substantially the rear, the neutral switch S4 is formed of the upper case half 32. The mounting seat surface is directed substantially rearward.

As shown in FIGS. 1 to 5 of Patent Document 1, the third rotation speed sensor S3 is attached to the rear surface 32b of the upper case half 32 in addition to the neutral switch S4, but the shifter switch 135 can not be found.
The shifter switch 135 can not be found on the upper surface 32 a of the upper case half 32.

  That is, in Patent Document 1, the shifter switch 135 is supposed to be attached to the upper case half 32 from the position of the shift spindle 84 shown in FIG. 2, but not on the rear surface 32b of the upper case half 32, A configuration in which the mounting surface of the shifter switch 135 and the mounting surface of the neutral switch S4 are parallel to each other is not disclosed.

Therefore, the neutral switch S4 and the shifter switch 135 are different from each other in the mounting / removing direction perpendicular to the mounting surface, and the maintainability when the neutral switch S4 and the shifter switch 135 are attached and detached is not good.
In addition, the workability in machining each mounting seat of the neutral switch S4 and the shifter switch 135 is not good.

  The present invention has been made in view of such a point, and the object of the present invention is to facilitate the work at the time of attaching and detaching the shift spindle sensor and the shift drum sensor and to be excellent in maintainability, and each of the shift spindle sensor and the shift drum sensor The point is to provide a transmission which is easy to process the mounting seat and is excellent in workability.

In order to achieve the above object, a transmission according to the present invention is:
A transmission built in a power unit mounted on a small vehicle,
A transmission comprising a shift spindle rotated by a shift operation, a shift drum rotated via a shift drum drive mechanism by rotation of the shift spindle, and a case member covering the shift spindle and the shift drum.
A shift spindle sensor that detects rotation of the shift spindle;
And a shift drum sensor that detects rotation of the shift drum.
The shift spindle sensor is mounted through a spindle sensor through hole bored in a spindle sensor mounting seat formed at a predetermined portion of the case member.
The shift drum sensor is mounted through a drum sensor through hole formed in a drum sensor mounting seat formed at a predetermined portion of the case member.
The direction in which the shift spindle sensor of the spindle sensor through hole is inserted is the same as the direction in which the shift drum sensor of the drum sensor through hole is inserted.

  According to this configuration, the direction in which the shift spindle sensor of the spindle sensor through hole formed in the spindle sensor mounting seat formed at the predetermined portion of the case member is inserted, and the drum formed at the predetermined portion of the case member The shift spindle sensor and the shift drum sensor are mounted from the same direction on the outside of the case member since the direction in which the shift drum sensor of the drum sensor through hole formed in the sensor mounting seat is inserted in the same direction -It can be removed, so that the work at the time of attaching and detaching the shift spindle sensor and the shift drum sensor is easy and excellent in maintainability.

  In addition, since the spindle sensor through hole and the drum sensor through hole face in the same direction, both spindle sensor mounting seat and drum sensor mounting seat can be processed from the same direction, and processing is easy and easy. It is excellent in workability.

In a preferred embodiment of the invention:
The shift spindle sensor is a limit switch that is turned on and off by moving a spindle sensor operation unit protruding from the spindle sensor main body back and forth in contact with a detected surface formed on a part of the outer peripheral surface of the shift spindle.
The shift drum sensor is a limit switch that is turned on and off by moving a drum sensor operation unit protruding from the drum sensor main body back and forth in contact with a detected surface formed on a part of the outer peripheral surface of the shift drum.
The forward and backward movement direction of the spindle sensor operation part (55b) and the forward and backward movement direction of the drum sensor operation part (48b) are the same.

  According to this configuration, since the forward and backward movement direction of the spindle sensor operation part and the forward and backward movement direction of the drum sensor operation part are the same direction, the acceleration due to the vibration of the power unit is the same in the spindle sensor operation part and the drum sensor operation part. Thus, it is possible to minimize the deviation due to the extrinsic between the detection timings of the operating state of the transmission by the shift spindle sensor and the shift drum sensor.

In a preferred embodiment of the invention:
The shift spindle and the shift drum are disposed so as to be horizontally shifted so that the rotation center axes are parallel to each other and do not overlap in the vertical direction.
The spindle sensor mounting seat and the drum sensor mounting seat are formed on an upper wall portion covering the shift spindle of the case member and the shift drum from above.

  According to this configuration, since the spindle sensor mounting seat and the drum sensor mounting seat are formed on the shift spindle of the case member and the upper wall covering the shift drum from above, the shift is mounted through the spindle sensor mounting seat The shift drum sensor mounted through the spindle sensor and the drum sensor mounting seat can be protected by the case member to protect the shift spindle sensor and the shift drum sensor from stepping stones or the like which are flipped up from below.

In a preferred embodiment of the invention:
At least one of the spindle sensor mounting seat and the drum sensor mounting seat is formed on the bottom wall of a recess that is recessed inward from the outside of the case member.

  According to this configuration, at least one of the spindle sensor mounting seat and the drum sensor mounting seat is formed on the bottom wall of the recess recessed inward from the outside of the case member, and hence the mounting seat formed on the bottom wall of the recess At least a portion of at least one of the attached shift spindle sensor or shift drum sensor is accommodated in the recess and protected from stepping stones and the like.

In a preferred embodiment of the invention:
The power unit is suspended from the vehicle body frame of the small vehicle through the projecting hanger portion of the case member.
The shift drum sensor is attached to a drum sensor mounting seat formed on the bottom wall of the recess formed in the hanger portion.

  According to this configuration, the shift drum sensor is attached to the drum sensor mounting seat formed on the bottom wall of the recess formed in the projecting hanger portion of the case member, so at least a part of the shift drum sensor is While being accommodated in the recess and securely protected from stepping stones and the like by the hanger portion, interference with other devices can be easily avoided.

In a preferred embodiment of the invention:
A rotation number sensor for detecting rotation of a transmission gear supported on a transmission gear shaft of the transmission is inserted into the case member at a position closer to either the shift spindle sensor or the shift drum sensor. It is attached.

  According to this configuration, since the rotation speed sensor is attached to the case member at a position closer to either the shift spindle sensor or the shift drum sensor, the rotation speed sensor may be mounted on either the shift spindle sensor or the shift drum sensor. The space can be effectively used by closely arranging them together and securing a space where other devices can be arranged in the case member.

In a preferred embodiment of the invention:
The shift drum sensor is attached to the drum sensor mounting seat formed at a portion on one end side of the case member in the rotation center axis direction of the shift drum.
The rotation number sensor is attached to a portion of the case member on the other end side opposite to the one end side in the rotation center axis direction of the shift drum.

  According to this configuration, the shift drum sensor is attached to the drum sensor mounting seat formed at the end of the case member on one end side of the shift drum in the direction of the rotational center axis of the shift drum. The shift drum sensor and the rotational speed sensor in the case member are mounted on the other end side of the shift drum in the direction of the central axis of rotation of the shift drum because the shift drum sensor and rotation speed sensor The space between the shift drum sensor and the rotational speed sensor of the case member is widely installed, and space is secured to allow other devices to be arranged, making the space effective. It can be used to

In a preferred embodiment of the invention:
A second shift spindle sensor, which detects rotation of the shift spindle, is provided on the case member at a position separated from the shift spindle sensor in the rotational center axis direction of the shift spindle.

  According to this configuration, since the rotation of the shift spindle is detected not only by the shift spindle sensor (referred to as the first shift spindle sensor) but also by the second shift spindle sensor, the first shift spindle sensor By means of two shift spindle sensors of two shift spindle sensors, the rotation of the shift spindle can be detected in more detail.

In a preferred embodiment of the invention:
The shift spindle sensor (55) detects rotation in one direction of the shift spindle (51), and the second shift spindle sensor (155) rotates in the other direction of the shift spindle (51). To detect.

  According to this configuration, since the shift spindle sensor (first shift spindle sensor) and the second shift spindle sensor detect rotation of the shift spindle in different directions, the rotation of the shift spindle on the shift up side And rotation on the downshift side can be identified and detected.

In a preferred embodiment of the invention:
The small-sized vehicle has a pair of left and right main frames which are separated left and right from the head pipe portion and extend rearward of the vehicle, and a center frame of the extension thereof.
A fuel tank is mounted between the left and right center frames,
A fuel pump unit including a fuel pump is attached to a bottom plate of the fuel tank with a fuel discharge portion projecting downward from the bottom plate,
The fuel tank is located above the case member,
The fuel pump unit at least partially overlaps the shift spindle sensor and the second shift spindle sensor in the front-rear direction and the left-right direction of the small vehicle.

  According to this configuration, the fuel pump unit attached to the bottom plate of the fuel tank located above the case member has a shift spindle sensor (first shift spindle sensor) at least partially in the front-rear direction and the left-right direction of the small vehicle Since the fuel pump unit overlaps with the second shift spindle sensor, the fuel discharge unit which is located near the center in the top view of the fuel pump unit and protrudes downward is the first shift spindle sensor and the second shift spindle sensor in the rotational center axis direction of the shift spindle. It is possible to position the fuel pump unit as close as possible to the case member of the power unit as far as possible without interfering with the first shift spindle sensor and the second shift spindle sensor within the range between the shift spindle sensor Lower the bottom plate of the fuel tank to which the fuel pump unit is attached, and It is possible to increase the capacity of the click.

In a preferred embodiment of the invention:
The small-sized vehicle is equipped with a quick shift mechanism that reduces the output of the internal combustion engine at the time of a gear shift and switches the gear position without a clutch operation.
The shift spindle is rotated via the link mechanism by the shift operation of the shift operating member,
A shift initial fluctuation detection unit that detects an initial fluctuation of the link mechanism due to a shift operation;
The control of the quick shift mechanism is performed based on a detection signal of the shift initial fluctuation detection means and detection signals of the shift spindle sensor and the second shift spindle sensor.

  According to this configuration, the small-sized vehicle is equipped with a quick shift mechanism that reduces the output of the internal combustion engine at the time of gear shift and switches the shift position without clutch operation, and detects shift initial fluctuation detecting shift of link mechanism due to shift operation. Since the control of the quick shift mechanism is performed based on the detection signal of the means and each detection signal of the shift spindle sensor (first shift spindle sensor) and the second shift spindle sensor, the internal combustion engine is detected based on the detection signal of the shift initial fluctuation detection means. The output control of the internal combustion engine is performed at a more appropriate timing by performing the output reduction of the internal combustion engine and canceling the output reduction of the internal combustion engine based on the detection signals of the first and second shift spindle sensors. By reducing the transmission torque and smoothly disengaging the transmission's dog clutch. , It is possible to perform gear change smoothly and quickly.

  The present invention relates to a direction in which a shift spindle sensor of a spindle sensor through hole formed in a spindle sensor mounting seat formed at a predetermined portion of a case member is inserted and a drum sensor mounting formed at a predetermined portion of the case member. Since the direction in which the shift drum sensor of the drum sensor through hole formed in the seat penetrates is the same direction, the shift spindle sensor and the shift drum sensor are attached and removed from the same direction on the outside of the case member. Therefore, the operation at the time of attachment and detachment of the shift spindle sensor and the shift drum sensor is easy and excellent in maintainability.

  In addition, since the spindle sensor through hole and the drum sensor through hole face in the same direction, both spindle sensor mounting seat and drum sensor mounting seat can be processed from the same direction, and processing is easy and easy. It is excellent in workability.

FIG. 1 is an overall left side view of a motorcycle equipped with a transmission according to an embodiment of the present invention. FIG. 2 is a side view of a power unit mounted on the same motorcycle. It is a top view of the power unit. It is a side view of the rear of the power unit It is a perspective view of the rear of the power unit. It is a perspective view which abbreviate | omits the crankcase of the rear part of the same power unit, and shows the internal structure of a transmission. FIG. 9 is a cross-sectional view of the power unit taken along line VIII-VIII in FIG. 3, just before mounting the shift drum sensor and the shift spindle sensor. It is sectional drawing of the power unit of the VIII-VIII arrow of FIG. It is sectional drawing of the power unit of the IX-IX arrow of FIG. It is a principal part left view of a two-wheeled motor vehicle carrying a transmission concerning another embodiment of the present invention. FIG. 11 is a cross-sectional view of essential parts of the motorcycle as viewed in the direction of arrows XI-XI in FIG. FIG. 2 is a top view of a power unit mounted on the same motorcycle. It is a side view of the rear of the power unit It is a perspective view of the rear of the power unit. It is principal part sectional drawing of the same power unit. It is a perspective view which abbreviate | omits the crankcase of the rear part of the same power unit, and shows the internal structure of a transmission. FIG. 5 is a perspective view showing the positional relationship between a first shift spindle sensor and a second shift spindle sensor with respect to the shift spindle. FIG. 7 is a left sectional view showing the states of the first shift spindle sensor and the second shift spindle sensor with respect to the shift spindle in the normal state. It is the same left sectional view at the time of shift up operation. It is the same left sectional view at the time of shift down operation. It is a simplified control block diagram of a quick shift mechanism.

Hereinafter, one embodiment according to the present invention will be described based on FIGS. 1 to 9.
FIG. 1 is a side view of a motorcycle 1 which is a straddle-type vehicle according to an embodiment of the present invention.
In the description of the present specification, the front, rear, left, and right directions conform to the usual standard with the straight direction of the motorcycle 1 according to this embodiment as the front, and in the drawings, FR denotes RR and RR denotes rear. LH indicates the left, and RH indicates the right.

The body frame 2 of the straddle-type motorcycle 1 is divided into right and left portions from the head pipe portion 3a, and a main frame (a wide frame provided with the down frame portion 3b) 3, 3 extends rearward and a center is connected to the rear end The frames 4 are bent downward to constitute a rear fork pivot 4a.
A seat rail 5 is extended rearward and obliquely upward from the bending portion of the center frames 4 and 4.

A front wheel 7 is pivotally supported at the lower end of a front fork 6 steerably supported by the head pipe portion 3 a, and a steering handle 8 is connected to the front fork 6.
In addition, a rear fork 10 whose front end is pivotally supported by a pivot shaft 9 is extended rearward to a rear fork pivot portion 4a of the center frame 4, and a rear wheel 11 pivotally supported at its rear end is pivotally provided vertically There is.

  The power unit 20 mounted on the vehicle body frame 2 of the motorcycle 1 has a transmission 30 provided with a manual transmission type multi-stage transmission (hereinafter simply referred to as "transmission") 31 at the rear of the crankcase 23 of the internal combustion engine 21. The power unit 20 is suspended by the down frame portion 3 b on the front side of the main frame 3 and the center frame 4 on the rear side.

Above the power unit 20, a fuel tank 13 is provided over the main frame 3 and the center frame 4, and a seat 14 is provided behind the fuel tank 13 and supported by the seat rail 5.
A side stand 15 is pivotally mounted on the lower end of the left center frame 4.

  A support bracket 16 is fixed to the rear of the pivot shaft 9 of the rear fork 10 at the center frame 4 with its front end fixed and projecting rearward, and a back step 17 for mounting the driver's foot on the support bracket 16 protrudes outward Is provided.

The internal combustion engine 21 is a water-cooled four-cylinder four-stroke cycle internal combustion engine, and is mounted on the motorcycle 1 with its crankshaft 22 oriented in the vehicle width direction (left-right direction).
The cylinder axis is slightly inclined forward on the crankcase 23 rotatably supporting the crankshaft 22, and the cylinder block 24 and the cylinder head 25 are fastened in an erected posture so as to be sequentially stacked. A cylinder head cover 26 is placed on top.

An intake pipe 27 extends upward from the forward-tilted cylinder head 25 of the internal combustion engine 21 via a throttle body 27t, and is connected to an air cleaner 27A.
Further, an exhaust pipe 28 extending forward from the cylinder head 25 bends downward and further extends rearward and is connected to the rear muffler 28M.

As shown in FIG. 4, the crankcase 23 of the internal combustion engine 21 comprises an upper crankcase 23U and a lower crankcase 23L divided into upper and lower parts, and a hanger portion 23h extends diagonally upward from the rear upper portion of the upper crankcase 23U. It's out.
With reference to FIGS. 4 and 5, the hanger portion 23h is a cylindrical bearing portion 23hb in which four arms 23ha arranged in the vehicle width direction extending diagonally upward from the upper crankcase 23U are directed in the left and right direction at the tip Support.

  The cylindrical bearing portion 23hb of the hanger portion 23h is disposed between the left and right center frames 4 of the vehicle body frame 2 as shown in FIGS. 1 and 2, and is penetrated and supported by a support shaft 18 Then, the power unit 20 is hung on the vehicle body frame 2.

  Referring to FIG. 4, the crankshaft 22 is pivotally supported at the mating surface of the upper crankcase 23U and the left and right bearing walls of the lower crankcase 23L divided up and down of the crankcase 23 and directed in the left-right direction of the transmission 31 Of the main shaft 32 and the counter shaft 33, the counter shaft 33 is also supported at the rear of the crankshaft 22 on the mating surface of the left and right bearing walls of the upper crankcase 23U and the lower crankcase 23L.

The main shaft 32 of the transmission 31 is positioned slightly forward of the counter shaft 33 and supported by the upper crankcase 23U.
In the transmission 31, a group of transmission drive gears 32g axially supported by the main shaft 32 and a group of transmission driven gears 33g axially supported by the counter shaft 33 are always meshed for each transmission ratio (see FIG. 6).

The counter shaft 33 is an output shaft of the power unit 20 and protrudes leftward through the left bearing wall, and an output sprocket 34 is fitted to the left end thereof. 37 covers (see Figure 1).
The output sprocket 34 is disposed at a position close to the front of the pivot shaft 9 pivotally supporting the rear fork 10 of the center frame 4, and between the output sprocket 34 and a driven sprocket 35 fitted to the rear axle of the rear wheel 11. The drive chain 36 is wound around, the output of the power unit 20 is transmitted to the rear wheel 11 via the drive chain 36, and the motorcycle 1 travels (see FIG. 1).

  Referring to FIG. 3, the upper wall portion 23Ua of the upper crankcase 23U covers the upper side of the transmission drive gear 32g group of the transmission 31 and the transmission driven gear 33g group, and the upper wall portion 23Ua penetrates from above A mounted rotational speed sensor 80 is disposed close to the rightmost transmission drive gear 32g that rotates with the main shaft 32 of the transmission drive gear 32g group (see FIGS. 6 and 9).

The rotational speed sensor 80 has a cylindrical sensor main body 80a penetrating through the through hole of the rotational speed sensor mounting seat 23C of the upper wall portion 23Ua, and the locking piece 81 projecting from the sensor main body 80a is a rotational speed sensor It is fastened and attached to the mounting seat 23C (see FIG. 9).
The rotation speed sensor 80 is a proximity sensor, and the detection unit 80b at the tip of the sensor main body 80a can face the teeth of the transmission drive gear 32g to detect the rotation speed of the main shaft 32 by rotation of the transmission drive gear 32g.

An AC generator 38 is provided at the left end of the crankshaft 22 penetrating the left bearing wall of the left and right bearing walls for supporting the crankshaft 22 of the crankcase 23 from the left side. The ACG cover 39 covers (see FIGS. 2 and 3).
On the other hand, a shift clutch 45 is provided along the primary driven gear 44 at the right end portion of the main shaft 32 penetrating the right bearing wall of the crankcase 23 (see FIG. 6). The clutch accommodating portion 23Ub which bulges upward from the wall portion 23Ua covers the outer periphery of the transmission clutch 45 (see FIGS. 3 and 5).

The rotational speed sensor 80, which is inserted into the upper wall portion 23Ua from above, is disposed on the left side along the clutch accommodating portion 23Ub which bulges upward from the upper wall portion 23Ua.
The right side of the transmission clutch 45 is covered by a clutch cover 46 (see FIG. 4).
A clutch operating portion 47 is provided on the clutch cover 46 (see FIG. 3), and the shift clutch 45 can be operated by manual operation.

Referring to FIG. 6, the main shaft 32 and the counter shaft 33 are located at the rear of the crankshaft 22 of the internal combustion engine 21 and at the upper and lower positions, and the shift drum 41 is disposed at the rear of the main shaft 32.
A shift fork shaft 42 is provided in parallel with the main shaft 32 and the counter shaft 33 between the shift driven gear 33g and the shift driven gear 33g diagonally below the shift drum 41, and the shift fork 43 slides on the shift fork shaft 42 in the left and right direction. It is pivotally supported freely.

  6 to 8, shift fork 43 has its engagement pin 43p slidably engaged with lead groove 41v of shift drum 41, and the forked bifurcated fork portion has main shaft 32 and counter shaft It is engaged with a shifter gear slidably supported at 33.

  Therefore, when the shift drum 41 is rotated, the shift fork 43 which is guided in the lead groove of the shift drum 41 and moves in the axial direction moves the shifter gear, and the dog clutch of the shifter gear engages with the main shaft 32 and the counter shaft. The meshing of the 33 transmission gear pairs is effective to establish one gear.

A detection surface 41f to be detected by the shift drum sensor 48 is formed at the left end in the left-right direction which is the rotation center axis direction of the cylindrical portion of the shift drum 41.
The shift drum sensor 48 corresponds to a neutral switch that detects a particularly neutral state of the rotation angle of the shift drum 41.

  The detected surface 41f of the shift drum 41 forms a convex surface 41fp in which a part of the circumferential surface protrudes in the radial direction, and the convex surface at the rotation angle of the shift drum 41 when the transmission 30 is in the neutral state. 41fp is configured to be located at the upper side.

  Referring to FIGS. 5 and 7, shift drum sensor 48 mounted on upper wall portion 23Ua of upper crankcase 23U covering the upper side of shift drum 41 is located above detection surface 41f at the left end of shift drum 41. .

The portion of the upper wall portion 23Ua of the upper crankcase 23U above the detection surface 41f at the left end of the shift drum 41 is the left end of the four arms 23ha of the hanger portion 23h projecting diagonally upward from the upper wall portion 23Ua. A drum sensor penetration hole 23Ah corresponding to the base end portion of the arm 23hal and having a recess 23D recessed downward and inward from above at the base end portion of the arm 23hal, and drilling in the bottom wall of the recess 23D in a substantially vertical direction A drum sensor mounting seat 23A is formed.
An internal thread is formed on the inner peripheral surface of the drum sensor through hole 23Ah.
A substantially horizontal opening upper end face of the drum sensor through hole 23Ah penetrating in a substantially vertical direction of the drum sensor mounting seat 23A forms a drum sensor mounting surface 23Af.

Referring to FIGS. 5 and 7, drum sensor mounting seat 23A on the bottom wall of recess 23D formed on the base end portion of arm 23hal on the left end of hanger 23h extending from the upper wall 23Ua of upper crankcase 23U , The shift drum sensor 48 is attached.
The shift drum sensor 48 is a limit switch in which a drum sensor operating portion 48b is urged by a spring and protrudes from a tip end of a cylindrical drum sensor main body 48a, and is turned on / off by forward and backward movement of the drum sensor operating portion 48b.

Referring to FIG. 7, the shift drum sensor 48 has a harness connected to the proximal end side of the enlarged flange portion 48f of the drum sensor main body 48a, and the cylindrical portion on the distal end side of the flange portion 48f of the drum sensor main body 48a. An external thread is formed on the outer peripheral surface.
In the shift drum sensor 48, the external thread of the cylindrical portion on the tip side of the flange portion 48f is screwed from above into the internal thread of the drum sensor through hole 23Ah of the drum sensor mounting seat 23A of the bottom wall of the recess 23D of the upper wall 23Ua. The flange portion 48f is mounted by being in contact with the substantially horizontal drum sensor mounting surface.

  When the shift drum sensor 48 is attached to the drum sensor mounting seat 23A, the proximal end side of the drum sensor main body 48a with respect to the flange portion 48f is located outside and mostly accommodated in the recess 23D, and the distal end side with respect to the other flange portion 48f A drum sensor operation portion 48b which is inserted into the drum sensor through hole 23Ah of the drum sensor mounting seat 23A and protrudes from the tip thereof contacts the detection surface 41f at the left end of the shift drum 41 from above (see FIG. 8).

FIG. 8 shows the time when the transmission 30 is in the neutral state, and the drum sensor operation portion 48b of the shift drum sensor 48 in contact with the convex surface 41fp with the convex surface 41fp of the detection surface 41f of the shift drum 41 positioned upward. And the shift drum sensor 48 is turned on.
When the shift drum 41 rotates and the neutral state is released, the drum sensor operation portion 48b of the shift drum sensor 48 moves away from the convex surface 41fp of the detection surface 41f and moves forward, and the shift drum sensor 48 is turned off. .
Thus, the shift drum sensor 48 can detect the neutral state of the shift drum 41.

A shift spindle 51 directed in the vehicle width direction (left and right direction) is rotatably supported by the crankcase 23 and disposed rotatably on the front side of the shift drum 41 in the forward direction.
The shift spindle 51 and the shift drum 41 are disposed so as to be shifted in the horizontal direction so that the rotation center axes are parallel to each other and do not overlap in the vertical direction.
The shift spindle 51 is covered at the upper side by the upper wall portion 23Ua of the upper crankcase 23U.

  Referring to FIG. 6, a ratchet arm 53 is fitted to the right end of the shift spindle 51. Power is transmitted between the ratchet arm 53 and the right axial end of the shift drum 41 to intermittently shift the shift drum. A shift drum drive mechanism 52 that rotates 41 is configured.

  In the shift spindle 51, the circular surface of a part of the circular outer peripheral surface is recessed at a position close to the right end where the ratchet arm 53 of the shift drum drive mechanism 52 on the output side (right side) is fitted. A flat detection surface 51f parallel to a plane including the axis is formed.

  On the upper wall 23Ua of the upper crankcase 23U covering the upper side of the shift spindle 51, the shift spindle sensor is located on the left side of the clutch accommodating portion 23Ub bulging upward from the upper wall 23Ua along the clutch accommodating portion 23Ub 55 is mounted through and attached from above (see FIGS. 3 and 5), and the detected surface 51f of the shift spindle 51 is located directly below the shift spindle sensor 55 (see FIGS. 6 and 9).

Referring to FIGS. 7 and 9, a spindle sensor through hole is formed in a substantially vertical direction in the upper wall 23Ua of upper crankcase 23U at a position above detected surface 51f near the right end of shift spindle 51. A spindle sensor mounting seat 23B having 23Bh is formed.
An internal thread is formed on the inner peripheral surface of the spindle sensor through hole 23Bh.
A substantially horizontal opening upper end face of a spindle sensor through hole 23Bh penetrating in a substantially vertical direction of the spindle sensor mounting seat 23B forms a spindle sensor mounting surface 23Bf.

  The shift spindle sensor 55 mounted on the spindle sensor mounting seat 23B is, similarly to the shift drum sensor 48, a limit switch in which the spindle sensor operation portion 55b is biased and protruded from the tip of the cylindrical spindle sensor main body 55a. And is turned on / off by the forward / backward movement of the spindle sensor operation unit 55b.

Referring to FIG. 7, the shift spindle sensor 55 has a harness connected to the proximal end side of the enlarged flange portion 55f of the spindle sensor main body 55a, and the cylindrical portion on the distal end side of the flange portion 55f of the spindle sensor main body 55a. An external thread is formed on the outer peripheral surface.
In the shift spindle sensor 55, the external thread of the cylindrical portion on the tip end side from the flange portion 55f is screwed from above into the female thread of the spindle sensor penetration hole 23Bh of the spindle sensor mounting seat 23B of the upper wall portion 23Ua. It is attached by being abutted against the substantially horizontal spindle sensor mounting surface 23Bf.

  Referring to FIG. 9, when shift spindle sensor 55 is attached to spindle sensor mounting seat 23B, the proximal end side of flange portion 55f of spindle sensor main body 55a is exposed to the outside, and the flange portion 55f of the other spindle sensor main body 55a. The distal end side is penetrated by the spindle sensor through hole 23Bh of the spindle sensor mounting seat 23B, and the spindle sensor operation portion 55b protruding from the distal end contacts the flat detection surface 51f near the right end of the shift spindle 51 from above. .

The spindle sensor operation unit 55b, which moves forward and backward in the vertical direction of the shift spindle sensor 55, is slightly forward of the central axis of rotation of the shift spindle 51 directed horizontally.
FIG. 9 shows a normal state in which the shift spindle 51 is not rotated, and the spindle sensor operation portion 55b of the shift spindle sensor 55 protrudes in contact with the center of the inclined flat detection surface 51f. The spindle sensor operation unit 55b is advanced to be in the on state.

  When the shift spindle 51 is pivoted counterclockwise in left side view, the spindle sensor operation portion 55b slides in while slidingly pushing the sliding surface 51f to be turned, and the shift spindle sensor 55 is turned off. The rotation can be detected.

  Since the shift spindle 51 has a small rotation angle, the spindle sensor actuating portion 55b moving forward and backward in the vertical direction of the shift spindle sensor 55 is shifted forward from the central axis of rotation of the shift spindle 51 to operate the shift spindle sensor 55. The moving distance of the portion 55b can be made as large as possible, and the detection accuracy is further improved.

The shift spindle 51 penetrates the crankcase 23 leftward and protrudes to the outside.
Referring to FIG. 2, a support bracket 60 is fixed to a lower end portion of the left center frame 4 below the protruding left end portion of the shift spindle 51. A shift control lever 62 whose front end is pivotally supported by the support shaft 61 is disposed to extend rearward.
At the rear end of the shift operation lever 62, a shift pedal 63 is provided so as to project leftward.

The shift control lever 62 is located below the left end of the shift spindle 51, and the shift control lever 62 and the shift pedal 63 are connected via a link mechanism 70.
Referring to FIG. 2, the link mechanism 70 directs the shift arm 71 fitted to the left end of the shift spindle 51 protruding leftward from the crankcase 23 and the lower shift operation lever 62 in a substantially vertical direction. The shift rod members 72 are connected.

  The lower end of the shift rod member 72 is supported by the shift support shaft 61, and a support formed at a portion closer to the shift support shaft 61 from the center of the shift operation lever 62 capable of swinging the shift pedal 63 at the rear end up and down. The upper end of the shift rod member 72 is pivotally connected to the rear end of the shift arm 71 whose front end is fitted to the left end of the shift spindle 51 by the coupling pin 71p. (See Figure 2).

The shift rod member 72 is provided with a lost motion mechanism 73 for transmitting an operation force by a resilient member.
The lost motion mechanism 73 absorbs an impact per dog of the dog clutch of the transmission 31 to obtain a good shift operation feeling.

  Referring to FIG. 2, back step 17 is provided at a slightly higher position behind shift pedal 63 at the rear end of shift operation lever 62, and the driver sitting on seat 14 places the left foot on back step 17. When the back step 17 is used as a fulcrum and the toe is hooked up to the shift pedal 63 from below and kicked up, the shift operation lever 62 swings upward and the shift up operation can be performed, and the toe is placed on the shift pedal 63 When the user depresses, the shift operation lever 62 swings downward and a downshift operation can be performed.

  That is, at the time of upshifting, the shift operation lever 62 is swung upward, so the shift rod member 72 axially supported by the connection pin 62p is pushed up, and the shift arm 71 is swung upward via the connection pin 71p. The shift spindle 51, to which the shift arm 71 is fitted, is turned counterclockwise in a left side view (FIG. 2).

  At the time of downshifting, since the shift operation lever 62 is swung downward, the shift rod member 72 pivotally mounted by the connection pin 62p is pulled down, and the shift arm 71 is swung downward via the connection pin 71p. The shift spindle 51 fitted with the arm 71 is rotated clockwise in a left side view (FIG. 2).

As described above, when the shift spindle 51 rotates, the shift drum 41 is rotated via the shift drum drive mechanism 52 to switch the gear position of the transmission 31.
As shown in FIG. 6, the shift spindle sensor 55 shifts the shift spindle 51 because the detected surface 51 f is close to the ratchet arm 53 on the output side (right side) in consideration of the twist of the shift spindle 51. The rotation on the drum drive mechanism 52 side (establishment of the gear) can be detected more accurately.

  From the detection of the neutral state of the shift drum 41 by the shift drum sensor 48 described above and the detection of the establishment of the neutral state by the shift spindle sensor 55, it can be reliably determined that the transmission is in the neutral state.

  The rotational speed sensor 80 disposed close to the rightmost transmission drive gear 32g that rotates integrally with the main shaft 32 is located above the detection surface 51f formed at a position near the right end of the shift spindle 51. It is close to the shift spindle sensor 55 disposed in

  A drum sensor mounting seat 23A to which the shift drum sensor 48 is mounted and a spindle sensor mounting seat 23B to which the shift spindle sensor 55 is mounted on the upper wall portion 23Ua of the upper crankcase 23U covering the shift drum 41 and the shift spindle 51 from above. And the direction in which the shift drum sensor 48 of the drum sensor penetration hole 23Ah, which is bored in the substantially vertical direction, is screwed in and pierced through the drum sensor mounting seat 23A (drum sensor (see FIG. 7). Direction in which the shift spindle sensor 55 of the spindle sensor through hole 23Bh drilled in the substantially vertical direction in the spindle sensor mounting seat 23B and the central axis direction of the through hole 23Ah is screwed in and inserted (a spindle sensor through hole The direction of the central axis of 23Bh) is the same direction.

  Referring to FIGS. 7-8, the moving direction of the drum sensor operating portion 48b of the shift drum sensor 48 mounted on the drum sensor mounting seat 23A and the spindle of the shift spindle sensor 55 mounted on the spindle sensor mounting seat 23B. The forward and backward movement directions of the sensor operation unit 55b are substantially vertical directions and are parallel to each other.

  With reference to FIGS. 3 to 5, starter motor 90 is disposed on the upper left rear of upper side crankcase 22 of upper crankcase 23U and is disposed to the left, and as shown in FIG. The large diameter gear 92 meshes with the pinion gear of the motor drive shaft 91 inserted into the projecting crankcase 23, and the small diameter gear 93 coaxial with the large diameter gear 92 is supported by the main shaft 32 via a one-way clutch. A starter driven gear 94 is engaged to constitute a starting mechanism.

The above-described embodiment of the transmission according to the present invention described in detail has the following effects.
As shown in FIG. 7, the direction in which the shift spindle sensor 55 of the spindle sensor penetration hole 23Bh bored in the spindle sensor mounting seat 23B formed in the upper wall portion 23Ua of the upper crankcase 23U penetrates the same upper wall Since the direction in which the shift drum sensor 48 of the drum sensor through hole 23Ah formed in the drum sensor mounting seat 23A formed in the portion 23Ua is the same direction, the shift spindle sensor 55 and the shift drum sensor 48 Can be attached and removed from the same direction on the outside of the upper crankcase 23U, whereby the work of attaching and detaching the shift spindle sensor 55 and the shift drum sensor 48 is easy and excellent in maintainability.

Further, since the spindle sensor through hole 23Bh and the drum sensor through hole 23Ah face in the same direction, both spindle sensor mounting seat 23B and drum sensor mounting seat 23A can be processed from the same direction. Is easy and excellent in processing workability.
That is, machining work of female threads of spindle sensor through hole 23Bh in spindle sensor mounting seat 23B and spindle sensor mounting seat 23Bf, and female threads of drum sensor through hole 23Ah in drum sensor mounting seat 23A and drum sensor mounting face 23Af Easy to do.

  7 to 9, since the advancing / retracting movement direction of the spindle sensor actuating portion 55b of the shift spindle sensor 55 and the advancing / retracting movement direction of the drum sensor actuating portion 48b of the shift drum sensor 48 are the same direction, the spindle sensor The acceleration due to the vibration of the power unit acts in the same manner on the actuating portion 55b and the drum sensor actuating portion 48b, so that the shift spindle sensor 55 and the shift drum sensor 48 detect the operating state (neutral state) of the transmission 30 Deviation can be kept small.

  As shown in FIGS. 3 to 5, since the spindle sensor mounting seat 23B and the drum sensor mounting seat 23A are formed on the shift spindle 51 of the crankcase 23 and the upper wall portion 23Ua covering the shift drum 41 from above, the spindle The shift spindle sensor 55 mounted through and mounted on the sensor mounting seat 23B and the shift drum sensor 48 mounted through and mounted on the drum sensor mounting seat 23A are protected by the crankcase 23 and from stepping stones etc. which are flipped up from below The shift spindle sensor 55 and the shift drum sensor 48 can be protected.

  As shown in FIGS. 5 and 8, the drum sensor mounting seat 23A is formed on the bottom wall of the recess 23D which is recessed inward from the outside of the top wall 23Ua of the upper crankcase 23U, so the bottom wall of the recess 23D. The shift drum sensor 48 attached to the drum sensor attachment seat 23A formed on the front end side of the flange portion 48f is inside the upper wall portion 23Ua, and the base end side of the flange portion 48f is accommodated in the recess 23D. Protected.

  As shown in FIGS. 5 and 7, the shift drum sensor 48 is attached to the drum sensor mounting seat 23A formed on the bottom wall of the recess 23D formed on the projecting hanger portion 23h of the upper crankcase 23U. Most of the base end side of the drum sensor main body 48a exposed to the outside is accommodated in the recess 23D of the hanger portion 23h, and the shift drum sensor 48 is surely protected from stepping stones etc. by the hanger portion 23h and interferes with other devices Can be easily avoided.

  Referring to FIG. 5, since rotation speed sensor 80 is attached to upper crankcase 23U at a position closer to shift spindle sensor 55 than shift drum sensor 48, rotation speed sensor 80 is brought closer to shift spindle sensor 55. The space can be effectively used by arranging them collectively and securing a space in the upper crankcase 23U where other equipment can be arranged.

  Referring to FIGS. 5 and 6, shift drum sensor 48 is attached to one of the left end portions of upper crankcase 23U in the direction of the rotation center axis of shift drum 41, and rotation speed sensor 80 is the upper crankcase. The shift drum sensor 48 and the rotational speed sensor 80 in the upper crankcase 23U are mounted on both ends in the direction of the central axis of rotation of the shift drum 41, since they are attached to the other right end side of the shift drum 41 in 23U. The space between the shift drum sensor 48 of the upper crankcase 23U and the rotational speed sensor 80 is widely installed at the left and right sides of each side of the side, and a space for other devices can be secured to make space effective. It can be used to

Next, another second embodiment of the present invention will be described based on FIGS. 10 to 21. FIG.
The power unit having the transmission according to the second embodiment and the two-wheeled motor vehicle equipped with the power unit are substantially the same as the power unit 20 and the two-wheeled motor vehicle 1 in the above embodiment, and the same members use the same reference numerals.

The power unit 20 includes an internal combustion engine 21 and a transmission 30 integrally in the front and rear direction, and has a fuel tank 13 above the transmission 30 at the rear of the power unit 20, as shown in FIG.
Referring to FIGS. 10 and 11, fuel tank 13 is supported such that its lower portion is sandwiched between left and right center frames 4, 4.
An intake pipe 27 and an air cleaner 27A are disposed in a space between the fuel tank 13 and the cylinder head 25 (and the cylinder head cover 26) of the internal combustion engine 21 in front of the fuel tank 13.

The upper wall portion 23Ua covers the upper side of the transmission drive gear 32g group of the transmission 31 and the transmission driven gear 33g group of the upper crankcase 23U of the crankcase 23 which is divided into upper and lower parts, and the fuel tank is covered with the upper wall 23Ua The 13 bottom plates 13b cover.
As shown in FIG. 11, the bottom plate 13 b of the fuel tank 13 is at a height at which the center frames 4, 4 are located on the left and right sides thereof.

A fuel pump unit 110 is provided on the bottom plate 13 b of the fuel tank 13 at a substantially central position (substantially in the widthwise center position of the vehicle body) of the crankcase 23 in the left and right vehicle width directions.
In the fuel pump unit 110, a cylindrical unit main body 110H for accommodating a fuel supply passage (not shown) having a pressure regulator and a fuel pump 111 is accommodated inside the fuel tank 13 above the bottom plate 13b. A fuel discharge portion 110t protruding downward from the main body portion 110H protrudes below the bottom plate 13b, that is, outside the fuel tank 13.

  Since the gap between the upper wall portion 23Ua of the upper crankcase 23U and the bottom plate 13b of the fuel tank 13 thereon is narrow, the fuel discharge portion 110t and the fuel supply hose 112 of the fuel pump unit 110 protruding downward from the bottom plate 13b are Approach the wall 23Ua.

  In the fuel pump unit 110, the fuel pump 111 sucks the fuel in the fuel tank 13 from the vicinity of the bottom plate 13b, and the fuel discharged from the fuel pump 111 passes through the fuel supply passage to the fuel discharge portion 110t outside the fuel tank 13. The fuel is supplied from the fuel discharge portion 110 t to the fuel injection valve 113 provided in the intake system of the internal combustion engine 21 through the fuel supply hose 112.

  In the transmission according to the present embodiment, the shift spindle 51 is rotated via the link mechanism 70 by the operation of the shift operation lever 62, which is a shift operation member, and the rotation of the shift spindle 51 is performed via the shift drum drive mechanism 52. By turning the shift drum 41, the shift gear of the transmission 31 is moved via the shift fork 43, and one gear is selected and established.

  Referring to FIG. 10 (and FIG. 2), the link mechanism 70 includes a shift arm 71 fitted to the left end of the shift spindle 51 projecting leftward from the crankcase 23 and a shift operation lever 62 below. A shift rod member 72 directed substantially in the vertical direction is connected.

The shift rod member 72 is provided with a lost motion mechanism 73 for transmitting an operation force by a resilient member.
In the lost motion mechanism 73 which absorbs the impact per dog of the dog clutch of the transmission 31 to obtain a good shift operation feeling, a shift stroke sensor which detects the telescopic stroke amount of the shift rod member 72 which expands and contracts by the lost motion mechanism 73 75 are attached.

The lost motion mechanism 73 has a structure in which a coil spring is interposed between the upstream portion and the downstream portion to expand and contract, and the shift stroke sensor 75 has a relative movement distance between the upstream portion and the downstream portion Is a linear displacement sensor that detects the
When the shift operation lever 62 is rocked, and the shift rod member 72 is pushed up and down, the coil spring of the lost motion mechanism 73 is compressed and expanded. It can be detected.

  Therefore, the shift stroke sensor 75 is a shift initial fluctuation detection unit that detects an initial fluctuation of the shift rod member 72 in the link mechanism 70 before the shift operation rotates the shift spindle 51 using the lost motion mechanism 73. , Shift up and shift down can be identified to detect shift initial fluctuation.

In the transmission according to the present embodiment, the first shift spindle sensor 55 and the second shift spindle sensor that detect the rotation of the shift spindle 51 on the upper wall portion 23Ua of the upper crankcase 23U covering the upper side of the shift spindle 51 155 are provided separately from each other in the rotation center axis direction of the shift spindle 51.
The first shift spindle sensor 55 and the second shift spindle sensor 155 are the same part.
Therefore, the cost can be reduced.

A spindle sensor through hole 23Bh in which a first shift spindle sensor 55 is mounted by being screwed in a substantially vertical direction at a position near the clutch accommodating portion 23Ub near the right end portion of the shift spindle 51 of the upper wall portion 23Ua. A spindle sensor mounting seat 23B is formed.
A second shift spindle sensor 155 has a spindle sensor through hole 123Bh to which a second shift spindle sensor 155 is screwed in a substantially vertical direction and attached at a position separated leftward from the spindle sensor mounting seat 23B of the upper wall portion 23Ua. A spindle sensor mounting seat 123B is formed.

  Similarly, the direction in which the shift drum sensor 48 of the drum sensor penetration hole 23Ah, which is bored in the substantially vertical direction, into the drum sensor attachment seat 23A of the upper wall portion 23Ua is screwed in and pierced (the central axis of the drum sensor penetration hole 23Ah Direction) and the direction in which the first shift spindle sensor 55 and the second shift spindle sensor 155 are inserted (in the direction of the central axis of the spindle sensor through hole 23Bh and the spindle sensor through hole 123Bh) in the same direction. is there.

  Therefore, together with the shift drum sensor 48, the first shift spindle sensor 55 and the second shift spindle sensor 155 can be attached and removed from the same direction outside the upper crankcase 23U, and accordingly, the shift drum sensor The operation at the time of attachment and detachment of the first shift spindle sensor 55 and the second shift spindle sensor 155 is easy, and the maintenance is excellent.

Further, since the spindle sensor through holes 23Bh and 123Bh and the drum sensor through hole 23Ah face in the same direction, the processing operations of both the spindle sensor mounting seats 23B and 123B and the drum sensor mounting seat 23A are the same. It is easy to process and has excellent processability.
That is, the female threads of spindle sensor through holes 23Bh and 123Bh in spindle sensor mounting seats 23B and 123B, and the female threads and drum sensor mounting seats of drum sensor through hole 23Ah in drum sensor mounting seat 23A The processing operation of the surface 23Af can be easily performed.

  The first shift spindle sensor 55 and the second shift spindle sensor 155 are limit switches in which the spindle sensor operation parts 55b and 155b are biased and protruded from the tips of the cylindrical spindle sensor bodies 55a and 155a, respectively. There is, it is turned on and off by advancing and retracting movement of the spindle sensor operation parts 55b and 155b.

Referring to FIGS. 15 to 17, when the first shift spindle sensor 55 is attached to the spindle sensor mounting seat 23B, the spindle sensor operation portion 55b protruding from the tip is flat detected near the right end of the shift spindle 51. Facing surface 51 f from above.
Similarly, when the second shift spindle sensor 155 is attached to the spindle sensor mounting seat 123B, the spindle sensor operation portion 155b protruding from the tip faces the flat detection surface 51g near the right end of the shift spindle 51 from above.

The spindle sensor operation portion 55b, which moves forward and backward in the vertical direction of the first shift spindle sensor 55, is at a position slightly behind the rotation center axis of the shift spindle 51 directed in the left and right horizontal direction.
Further, the spindle sensor operation portion 155b, which moves forward and backward in the vertical direction of the second shift spindle sensor 155, is at a position slightly shifted forward with respect to the central axis of rotation of the shift spindle 51 directed horizontally.
The spindle sensor operating portion 55b of the first shift spindle sensor 55 and the spindle sensor operating portion 155b of the second shift spindle sensor 155 have substantially equal amounts of longitudinal shift with respect to the central axis of rotation of the shift spindle 51.

FIG. 15 is a cross-sectional view of the upper crankcase 23U covering the shift drum 41 and the shift spindle 51 from above at a position of the second shift spindle sensor 155 and viewed from the axial left side of the shift spindle 51.
17 shows the positional relationship between the first shift spindle sensor 55 and the second shift spindle sensor 155 with respect to the shift spindle 51, the shift spindle 51, the first shift spindle sensor 55, and the second shift spindle sensor 155. It is a perspective view.

In FIG. 18, the shift spindle 51, the first shift spindle sensor 55, and the second shift spindle sensor 155 in the positional relationship shown in FIG. FIG. 6 is an explanatory view of the shift spindle 51 as viewed from the left side in the axial direction.
FIGS. 15 to 18 show a normal state in which no shift operation is performed and the shift spindle 51 is not rotated.

  Referring to FIGS. 15 to 18, the flat detection target surface 51f on the right side of the shift spindle 51 facing the spindle sensor operation portion 55b which projects substantially vertically downward of the first shift spindle sensor 55 and the second shift spindle sensor The flat detection surface 51g on the left side of the shift spindle 51 facing the spindle sensor operation portion 155b which protrudes substantially vertically downward 155 is not parallel but has an angle with each other.

  Referring to FIG. 18, in the normal state where shift spindle 51 is not rotated, detection surface 51f formed on the right side of the upper portion of the outer peripheral surface of shift spindle 51 directed horizontally is The left side of the upper portion of the outer peripheral surface of the shift spindle 51 is inclined rearward at an angle of about 16 degrees from the horizontal toward the spindle sensor operation portion 55b projecting substantially vertically downward of the shifted first shift spindle sensor 55. The to-be-detected surface 51g formed on the front side is inclined forward by about 16 degrees from the horizontal direction toward the spindle sensor operation portion 155b which protrudes substantially vertically downward of the second shift spindle sensor 155 shifted forward. .

  In a normal state in which the shift spindle 51 is not rotated, as shown in FIG. 18, the spindle sensor operation portion 55b of the first shift spindle sensor 55 faces in close proximity to the detected surface 51f but is in contact with it. Instead, the motor travels and is in the off state, and the spindle sensor operation portion 155b of the second shift spindle sensor 155 also faces in close proximity to the detected surface 51g, but does not contact and travels and is in the off state.

The first shift spindle sensor 55 and the second shift spindle sensor 155 are in the OFF state by the progress of the spindle sensor operating portions 55b and 155b, contrary to the above embodiment.
When the shift operation lever 62 is swung upward and shift up operation is performed, the shift rod member 72 is pushed up, and the shift spindle 51 is pivoted counterclockwise in a left side view shown in FIG.

  At the time when the counterclockwise rotation of the shift spindle 51 due to the up-shifting operation is completed (at the establishment of the shift speed), the to-be-detected surface 51f facing obliquely backward is counterclockwise as shown in FIG. The rear end 51fr of the detection surface 51f contacts the spindle sensor operating portion 55b of the first shift spindle sensor 55 and pushes in the spindle sensor operating portion 55b. Turns on.

  On the other hand, although the detected surface 51g, which has been directed diagonally forward, rotates counterclockwise to make the inclination steeper, the detected surface 51g is the spindle sensor operation portion of the second shift spindle sensor 155. It is not in contact with 155b, and the second shift spindle sensor 155 remains off.

  Therefore, the end point of the counterclockwise rotation of shift spindle 51 in the upshift operation, that is, the point in time when the upshifted gear is established can be accurately detected by turning on the first shift spindle sensor 55. .

  Conversely, when the shift operation lever 62 is swung downward and a downshift operation is performed, the shift rod member 72 is pulled down, and the shift spindle 51 is pivoted clockwise in a left side view shown in FIG.

  At the time when clockwise rotation of the shift spindle 51 due to the downshifting operation is completed (establishment of shift speed), as shown in FIG. 20, the to-be-detected surface 51g facing obliquely forward rotates clockwise. And the front end portion 51gf of the detection surface 51g contacts the spindle sensor operation portion 155b of the second shift spindle sensor 155 to push the spindle sensor operation portion 155b, and the second shift spindle sensor 155 is turned on. .

  On the other hand, although the detected surface 51f which is directed obliquely backward is rotated clockwise to make the inclination steeper, the detected surface 51f is the spindle sensor operating portion 55b of the first shift spindle sensor 55. The first shift spindle sensor 55 remains in the off state.

  Therefore, the end point of the clockwise rotation of the shift spindle 51 in the downshift operation, that is, the point in time when the downshifted gear is established can be accurately detected by turning on the second shift spindle sensor 155.

The motorcycle 1 is equipped with a quick shift mechanism Q that reduces the output of the internal combustion engine 21 at the time of a gear shift and switches the gear position without a clutch operation.
The quick shift mechanism Q controls the fuel injection valve 113 and the ignition device 201 by the ECU (electronic control unit) 200 to reduce the output of the internal combustion engine 21.

As shown in FIG. 21, detection signals of shift stroke sensor 75, first shift spindle sensor 55, and second shift spindle sensor 155 are input to ECU 200, and fuel injection valve 113 is input based on each detection signal. And outputs a control signal to the igniter 201 to perform drive control.
The ECU 200 also receives a detection signal of the throttle sensor 160 provided on the throttle body 27t for detecting the degree of opening of the throttle valve.

In the present transmission 30, particularly when upshifting, the ECU 200 controls the fuel injection valve 113 to prohibit fuel supply when the shift stroke sensor 75 detects an initial change of the link mechanism 70 due to the upshifting operation. At the same time, the output of the internal combustion engine 21 is reduced by controlling the igniter 201 to delay the ignition timing.
By reducing the output of the internal combustion engine 21, the transmission torque of the transmission can be reduced and the dog clutch of the transmission can be smoothly removed without operating the clutch of the transmission clutch 45, so that the gear shift can be switched smoothly and quickly. It can be carried out.

  Then, the shift spindle 51 is rotated by the upshift operation through the link mechanism 70, and the first shift spindle sensor 55 turns on and detects the end of the rotation, that is, the time when the upshifted gear is established. When the reduction of the output of the internal combustion engine 21 is canceled, the output can be recovered quickly.

  In addition, even when accelerating at the time of downshift as in kickdown, the kickdown operation is determined based on the detection signal of the throttle sensor 160 together with the shift stroke sensor 75, and the fuel injection valve 113 is controlled to prohibit fuel supply. At the same time, control is made to reduce the output of the internal combustion engine 21 by delaying the ignition timing by controlling the igniter 201, and switching of the shift position smoothly and quickly without operating the clutch. When the second shift spindle sensor 155 turns on and detects that the end of the rotation, that is, the point when the downshifted gear is established, the output of the internal combustion engine 21 is released and the output is recovered quickly Can be controlled to

The second embodiment of the transmission according to the present invention described in detail above has the following effects.
As shown in FIG. 17, since the rotation of the shift spindle 51 is detected not only by the first shift spindle sensor 55 but also by the second shift spindle sensor 155, the first shift spindle sensor 55 and the second shift spindle sensor 55 The two shift spindle sensors of the shift spindle sensor 155 can detect the rotation of the shift spindle 51 in more detail.

  As shown in FIGS. 11 and 17, the first shift spindle sensor 55 detects rotation on the shift up side of the shift spindle 51, and the second shift spindle sensor 155 detects the shift down side of the shift spindle 51. Can be detected.

  In the motorcycle 1 on which the transmission according to the present embodiment is mounted, when the toe is hooked up to the shift pedal 63 from below and kicked up, the shift operation lever 62 swings upward and the shift spindle 51 counterclockwise in left side view. The shift operation lever 62 swings downward and the shift spindle 51 pivots clockwise in left side view to shift down. The first shift spindle sensor 55 detects an upshift operation, and the second shift spindle sensor 155 detects a downshift operation.

  Conversely, in a small vehicle equipped with a shift operation structure of reverse shift that shifts up when the shift pedal is depressed and shifts down when kicking up the shift pedal, the first shift spindle sensor 55 detects the shift down operation, and If the second shift spindle sensor 155 detects the shift-up operation, the positional relationship between the first shift spindle sensor 55 and the second shift spindle sensor 155 with respect to the shift spindle 51 remains the same as it is, and the reverse shift is shifted. It can be easily applied to the operation structure.

  As shown in FIG. 12, the fuel pump unit 110 (shown by a dotted pattern in FIG. 12) attached to the bottom plate 13b of the fuel tank 13 located above the crankcase (case member) 23 is at least partially small. Since the first shift spindle sensor 55 and the second shift spindle sensor 155 overlap in the front-rear direction and the left-right direction of the vehicle, the fuel discharge unit 110t that is near the center in the top view of the fuel pump unit 110 and protrudes downward is The direction of the rotation center axis of the shift spindle 51 is in the range between the first shift spindle sensor 55 and the second shift spindle sensor 155, and interferes with the first shift spindle sensor 55 and the second shift spindle sensor 155. It is possible to position the fuel pump unit 110 as close to the crankcase 23 of the power unit 20 as far as possible without Lower the bottom plate 13b of the fuel tank 13 to the pump unit 110 is mounted, it is possible to increase the capacity of the fuel tank 13.

  Referring to FIG. 21, the motorcycle 1 is equipped with a quick shift mechanism Q that reduces the output of the internal combustion engine 21 at the time of gear shift and switches the gear without clutch operation, and performs initial fluctuation of the link mechanism 70 due to shift operation. Since the control of the quick shift mechanism Q is performed based on the detection signal of the shift stroke sensor 75 to be detected and the detection signals of the first shift spindle sensor 55 and the second shift spindle sensor 155, the detection signal of the shift stroke sensor 75 is used. The output control of the internal combustion engine 21 is more appropriately performed by executing the output reduction of the internal combustion engine and canceling the output reduction of the internal combustion engine based on the detection signals of the first and second shift spindle sensors 55, 155. Transmission transmission torque can be reduced and the dog clutch of the transmission can be disengaged smoothly without clutch operation. The gear can be switched smoothly and quickly.

  As mentioned above, although the transmission concerning two embodiments concerning the present invention was explained, the mode of the present invention is not limited to the above-mentioned embodiment, What is carried out in various modes in the range of the gist of the present invention It is included.

  For example, although the transmission 30 according to the present embodiment operates the shift operation lever 62 to rotate the shift spindle 51 via the link mechanism 70 to switch the shift position, as disclosed in Patent Document 1 Alternatively, the shift spindle may be switched by rotating the shift spindle using an actuator such as an electric motor.

  Further, the shape of the detection surface formed on the shift spindle is not limited to a flat surface, and may be formed as an uneven surface.

DESCRIPTION OF SYMBOLS 1 ... motorcycle, 2 ... body frame, 3 ... main frame, 3a ... head pipe part, 4 ... center frame, 5 ... seat rail, 13 ... fuel tank, 13b ... bottom plate, 14 ... seat, 16 ... support bracket, 17 …backstep,
DESCRIPTION OF SYMBOLS 20 ... Power unit, 21 ... Internal combustion engine, 22 ... Crankshaft, 23 ... Crankcase (case member), 23U ... Upper crankcase, 23Ua ... Upper wall part, 23D ... Recess, 23A ... Drum sensor mounting seat, 23Af ... Drum sensor Mounting seat surface, 23Ah: Drum sensor penetration hole, 23B: Spindle sensor mounting seat, 23Bf: Spindle sensor mounting seat surface, 23Bh: Spindle sensor penetration hole, 23C: Rotational speed sensor mounting seat, 23h: Hanger portion, 23Ub ... Clutch housing portion, 23 Uc ... bulging portion, 23 L ... lower crankcase,
30: Transmission, 31: Transmission, 32: Main shaft, 33: Counter shaft (output shaft), 37: Output sprocket cover, 38: AC generator, 39: ACG cover,
41: shift drum, 41f: detected surface, 41fp: convex surface, 42: shift fork shaft, 43: shift fork, 44: primary driven gear, 45: shift clutch, 46: clutch cover, 47: clutch operating portion,
48: shift drum sensor (neutral switch), 48a: drum sensor main body, 48b: drum sensor operating portion, 48f: flange portion,
51: Shift spindle, 51f: detected surface, 52: shift drum drive mechanism, 53: ratchet arm,
55: shift spindle sensor (first shift spindle sensor), 55a: spindle sensor main body, 55b: spindle sensor operating portion, 55f: flange portion, 60: support bracket, 61: shift support shaft, 62: shift operation lever, 63 ... shift pedal, 64 ... pin ... 70 ... link mechanism, 71 ... shift arm, 72 ... shift rod member, 73 ... lost motion mechanism, 75 ... shift stroke sensor (shift initial fluctuation detection means),
80: Rotational speed sensor, 80a: Sensor body, 80b: Detection portion, 81: Locking piece, 82: Bolt,
90: starter motor, 91: motor drive shaft, 92: large diameter gear, 93: small diameter gear, 94: starter driven gear,
101 ... Shift spindle,
110 fuel pump unit 111 fuel pump 112 fuel supply hose 113 fuel injection valve
155: second shift spindle sensor, 155a: spindle sensor main body, 155b: spindle sensor operating portion,
160 ... throttle sensor,
Q: Quick shift mechanism, 200: ECU (electronic control unit), 201: igniter.

Claims (11)

A transmission (30) incorporated in a power unit (20) mounted on a small vehicle (1),
A shift spindle (51) rotated by a shift operation, a shift drum (41) rotated via a shift drum drive mechanism (52) by rotation of the shift spindle (51), the shift spindle (51), And a case member (23) covering the shift drum (41).
A shift spindle sensor (55) for detecting rotation of the shift spindle (51);
A shift drum sensor (48) for detecting rotation of the shift drum (41);
The shift spindle sensor (55) is mounted through a spindle sensor through hole (23Bh) formed in a spindle sensor mounting seat (23B) formed at a predetermined portion of the case member (23).
The shift drum sensor (48) is mounted through a drum sensor through hole (23Ah) formed in a drum sensor mounting seat (23A) formed at a predetermined portion of the case member (23).
The direction in which the shift spindle sensor (55) of the spindle sensor through hole (23Bh) is inserted, and the direction in which the shift drum sensor (48) of the drum sensor through hole (23Ah) is inserted A transmission characterized in the same direction. The shift spindle sensor (55) is in contact with a detection surface (51f) formed on a part of the outer peripheral surface of the shift spindle (51) with a spindle sensor operation part (55b) protruding from the spindle sensor main body (55a) Limit switch that turns on and off by moving back and forth,
In the shift drum sensor (48), a drum sensor operation portion (48b) protruding from the drum sensor main body (48a) is in contact with a detection surface (41f) formed on a part of the outer peripheral surface of the shift drum (41). Limit switch that turns on and off by moving back and forth,
The transmission according to claim 1, wherein the forward and backward movement direction of the spindle sensor operation part (55b) and the forward and backward movement direction of the drum sensor operation part (48b) are the same. The shift spindle (51) and the shift drum (41) are disposed so as to be horizontally shifted so that the rotation center axes are parallel to each other and do not overlap in the vertical direction.
The spindle sensor mounting seat (23B) and the drum sensor mounting seat (23A) are provided on the upper wall (23Ua) covering the shift spindle (51) of the case member (23) and the shift drum (41) from above The transmission according to claim 1 or 2, characterized in that it is formed.   At least one of the spindle sensor mounting seat (23B) and the drum sensor mounting seat (23A) is formed on the bottom wall of a recess (23D) recessed inward from the outside of the case member (23). The transmission according to any one of claims 1 to 3. The power unit (20) is suspended from the vehicle body frame (2) of the small vehicle via the projecting hanger portion (23h) of the case member (23).
The shift drum sensor (48) is mounted on the drum sensor mounting seat (23A) formed on the bottom wall of the recess (23D) formed on the hanger portion (23h). Transmission according to.   A rotational speed sensor (80) for detecting rotation of a transmission gear (32g) supported by a transmission gear shaft (32) of the transmission (30) is the shift spindle sensor (55) or the shift drum sensor ( A transmission according to any one of the preceding claims, characterized in that it is mounted through the case member (23) at a position closer to any one of 48). The shift drum sensor (48) is attached to the drum sensor mounting seat (23A) formed at a portion on one end side of the case member (23) in the rotation center axial direction of the shift drum (41). ,
The rotation speed sensor (80) is attached to a portion of the case member (23) on the other end side opposite to the one end side in the rotation center axis direction of the shift drum (41). The transmission according to claim 6, characterized in that:   A second shift spindle sensor (155) for detecting rotation of the shift spindle (51) at a position separated from the shift spindle sensor (55) in the rotational center axis direction of the shift spindle (51) is the case member A transmission according to any one of the preceding claims, characterized in that it is provided in (23).   The shift spindle sensor (55) detects rotation in one direction of the shift spindle (51), and the second shift spindle sensor (155) rotates in the other direction of the shift spindle (51). The transmission according to claim 8, wherein the transmission is detected. The small-sized vehicle has a pair of left and right main frames (3, 3) which are divided leftward and rightward from the head pipe portion (3a) and extend rearward of the vehicle, and a center frame (4, 4) of the extension.
A fuel tank (13) is mounted between the left and right center frames (4, 4),
A fuel pump unit (110) including a fuel pump (111) is attached to a bottom plate (13b) of the fuel tank (13) with a fuel discharge portion (110t) projecting downward from the bottom plate (13b),
The fuel tank (13) is located above the case member (23),
The fuel pump unit (110) is characterized in that at least a part overlaps the shift spindle sensor (55) and the second shift spindle sensor (155) in the front-rear direction and the left-right direction of the small vehicle. The transmission according to claim 8 or claim 9. The small-sized vehicle (1) is equipped with a quick shift mechanism (Q) that reduces the output of the internal combustion engine (21) at the time of gear shift and switches the gear without operating the clutch.
The shift spindle (51) is rotated via the link mechanism (70) by the shift operation of the shift operation member (62).
Shift initial fluctuation detection means (75) for detecting an initial fluctuation of the link mechanism (70) due to a shift operation;
Controlling the quick shift mechanism (Q) based on the detection signal of the shift initial fluctuation detection means (75) and the detection signals of the shift spindle sensor (55) and the second shift spindle sensor (155) The transmission according to any one of claims 8 to 10, characterized in that:

Images