JP2015068420A - Shift operation mechanism of saddle type on-vehicle power unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shift operation mechanism of a saddle type on-vehicle power unit that suppresses increase in the size of the power unit by forming a recess part, into which a shift rod is inserted, in an output sprocket cover, to thereby ensure excellent straddling performance of a driver.SOLUTION: In a shift operation mechanism of a saddle type on-vehicle power unit, in a link mechanism (70), a shift rod (71) connects shift operation members (62, 63) and a shift arm (52) fitted to a shift spindle (51) of a shift drive device (50) to transmit operation power; a recess part (46) is formed in an output sprocket cover (45) so as to be recessed inwardly in a vehicle width direction; and at least a part of the shift rod (71) overlapped with the output sprocket cover (45) in a side surface view is inserted into the recess part (46) of the output sprocket cover (45).

Description

  The present invention relates to a speed change operation mechanism for a power unit mounted on a saddle riding type vehicle.

  Conventionally, in a configuration in which a power unit that houses a transmission in a crankcase of an internal combustion engine is mounted on a saddle-ride type vehicle, the operation of a shift operation lever provided on the lower side of the crankcase is switched between gear positions in the crankcase. There is disclosed a speed change operation mechanism in which a shift rod of a link mechanism that transmits to a speed change drive device is disposed along an outer surface of a side wall of a crankcase (see, for example, Patent Document 1).

JP 2008-074134 A

  The speed change operation mechanism disclosed in Patent Document 1 is a shift arm (link arm) of a speed change drive device above an output sprocket that is fitted to an end projecting through a crankcase of an output shaft of a power unit. ) And a shift operation lever below the output sprocket are disposed along the outer surface of the output sprocket cover that covers the output sprocket.

  An output sprocket cover that protrudes outward in the vehicle width direction from the crankcase is covered by an output sprocket cover from the outside, and a link rod is disposed on the outer side of the output sprocket cover so as to be inclined in the vertical direction.

  The shift operation lever linked to the lower end of the link rod is operated by the driver's feet sitting on the seat so as to straddle the power unit of the saddle riding type vehicle. The part will be located.

  Therefore, if a long link rod is disposed vertically on the outer side of the output sprocket cover in the vehicle width direction, it is easy for the driver's leg to hit the link rod, and the link rod protrudes outward in the vehicle width direction. As a result, the rider's straddling ability of the driver sitting on the seat across the power unit may be impaired.

  The present invention has been made in view of the above points, and the object of the present invention is to form a recess through which the shift rod is inserted in the output sprocket cover, thereby suppressing the enlargement of the power unit and improving the straddling property of the driver. The present invention is to provide a speed change operation mechanism for a power unit mounted on a saddle type vehicle that can be secured satisfactorily.

In order to achieve the above object, the invention according to claim 1
A power unit (20) housing a transmission (31) in a crankcase (23) of an internal combustion engine (21) is mounted on a body frame (2) of a saddle-ride type vehicle (1),
The output shaft (33) of the power unit (20) is provided to protrude through the crankcase (23) outward in the vehicle width direction,
An output sprocket (34) is fitted to the protruding end of the output shaft (33),
The output sprocket (34) is covered from the side by an output sprocket cover (45),
A shift drive device (50) for switching the gear position of the transmission (31) is provided in the crankcase (23),
A shift operation member (62, 63) pivotally supported by the body frame (2) is provided at the lower rear of the power unit (20),
In the shift operation mechanism of the straddle-type vehicle-mounted power unit in which the swing of the shift operation member (62, 63) due to the shift operation is transmitted to the shift drive device (50) via the link mechanism (70),
In the link mechanism (70), a shift rod (71) connects the shift operation member (62, 63) and a shift arm (52) fitted to a shift spindle (51) of the transmission drive device (50). To transmit operating power,
The shift rod (71) overlaps the output sprocket cover (45) in a side view,
The output sprocket cover (45) is recessed inward in the vehicle width direction to form a recess (46),
At least a part of the shift rod (71) is inserted into the recess (46) of the output sprocket cover (45).

The invention according to claim 2
In the shifting operation mechanism of the saddle-ride type vehicle-mounted power unit according to claim 1,
The shift rod (71) is oriented substantially in the vertical direction, and is arranged to be inclined in the vehicle width direction so as to shift inward in the vehicle width direction from the lower part toward the upper part.

The invention described in claim 3
In the shifting operation mechanism of the straddle-type vehicle-mounted power unit according to claim 2,
The concave portion (46) of the output sprocket cover (45) is a half-cylindrical semi-cylindrical concave portion (46) substantially parallel to the shift rod (71), and the output sprocket cover as it goes from the lower part to the upper part. (45) The amount of protrusion that protrudes inward in the vehicle width direction gradually increases.

The invention according to claim 4
In the shifting operation mechanism of the saddle-ride type vehicle-mounted power unit according to claim 2 or 3,
The shift arm (52) is disposed above the output sprocket (34),
The shift operation member (62, 63) is a shift operation lever (62) having a shift pedal (63) at its end, and is disposed below the output sprocket (34).

The invention according to claim 5
In the shifting operation mechanism of the saddle-ride type vehicle-mounted power unit according to any one of claims 2 to 4,
The shift rod (71) is characterized in that the upper part is inserted through the upper part of the semi-cylindrical recess (46).

The invention described in claim 6
In the shifting operation mechanism of the saddle-ride type vehicle-mounted power unit according to claim 4 or 5,
The shift rod (71) has one lower end pivotally connected to the shift operation lever (62) from the inside in the vehicle width direction, and the other upper end pivotally connected to the shift arm (52) from the outside in the vehicle width direction. It is characterized by that.

The invention described in claim 7
In the shift operation mechanism of the saddle-ride type vehicle-mounted power unit according to any one of claims 4 to 6,
The shift arm (52) is bent in the middle of extending forward from a base end (52r) fitted to the shift spindle (51) and biased inward in the vehicle width direction from the base end (52r). To the transferred tip (52f)
The shift rod (71) is pivotally connected to the tip end portion (52f) of the shift arm (52).

The invention described in claim 8
In the shift operation mechanism of the saddle-ride type vehicle-mounted power unit according to any one of claims 1 to 7,
A functional component is disposed in a space formed between the output sprocket cover (45) and the side wall of the crankcase (23) facing each other.

The invention according to claim 9
The shift operation mechanism of the saddle-ride type vehicle-mounted power unit according to any one of claims 1 to 8,
The shift rod (71) is disposed behind an ACG cover (41) that covers an AC generator (40) protruding from the side of the crankcase (23).

  According to the shift operation mechanism of the saddle-ride type vehicle-mounted power unit according to claim 1, the concave portion (46) is formed on the output sprocket cover (45) covering the output sprocket (34) from the side so as to be recessed inward in the vehicle width direction. ), At least a part of the shift rod (71) is inserted, so that the shift rod (71) can be moved inward in the vehicle width direction, and the driver unit can be straddled by suppressing the enlargement of the power unit (20). Can be secured satisfactorily.

  According to the shifting operation mechanism of the straddle-type vehicle-mounted power unit according to claim 2, the shift rod (71) is directed substantially in the vertical direction, and shifts inward in the vehicle width direction from the lower part to the upper part. Since it is disposed inclined in the vehicle width direction, it is possible to secure a wider space above the lower side of the space around the driver's leg on the side of the output sprocket cover (45), The straddling property of the driver can be further improved.

  According to the shifting operation mechanism of the straddle-type vehicle-mounted power unit according to claim 3, the recess (46) of the output sprocket cover (45) is a half-cylindrical recess that is substantially parallel to the shift rod (71). (46), and the amount of protrusion that protrudes inward in the vehicle width direction of the output sprocket cover (45) gradually increases from the bottom to the top, and therefore shifts inward in the vehicle width direction from the bottom to the top. The shift rod (71) disposed so as to be inclined in the vehicle width direction can be accommodated at least partially in the semi-cylindrical recess (46), and a wide space around the driver's legs is secured. It is possible to improve the driver's straddling performance.

  According to the shift operation mechanism of the saddle-ride type vehicle-mounted power unit according to claim 4, the shift arm (52) is disposed above the output sprocket (34), and the shift operation member (62, 63) has an end portion. Shift lever (62) with a shift pedal (63) at the bottom, and is arranged below the output sprocket (34), so it can be operated by the upper shift arm (52) and the lower driver's feet. The driver's legs are positioned on the side of the shift rod (71) that connects the shift lever (62) to be operated, but the side space of the shift rod (71) is above the lower side. By securing a wider space, the shift rod (71) does not interfere with the driver's legs, and the straddling property can be secured satisfactorily.

  According to the shifting operation mechanism of the saddle-ride type vehicle-mounted power unit according to claim 5, the shift rod (71) has an upper portion in which the upper portion has the largest protrusion amount inward in the vehicle width direction of the semi-cylindrical recess (46). Therefore, the upper part of the shift rod (71) is buried in the semi-cylindrical recess (46), and the shift rod (71) is tilted in the vehicle width direction to improve the straddling property and improve the front and rear of the vehicle. The shift rod (71) can be protected from a stepping stone kicked up by a wheel from the direction.

  According to the shift operation mechanism of the saddle-ride type vehicle-mounted power unit according to claim 6, one end of the shift rod (71) is pivotally connected to the shift operation lever (62) from the inner side in the vehicle width direction. Since the upper end is pivotally connected to the shift arm (52) from the outside in the vehicle width direction, the semi-cylindrical recess (46) of the output sprocket cover (45) is inserted through the upper end to the shift arm (52) in the vehicle width direction outside. Since the lower end of the shift rod (71) pivotally attached to the shift operation lever (62) is located on the inner side in the vehicle width direction, it can be easily attached to the shift operation lever (62) from the inner side in the vehicle width direction. Easy to install.

  According to the shift operation mechanism of the saddle-ride type vehicle-mounted power unit according to claim 7, the shift arm (52) is in the middle of extending forward from the base end (52r) fitted to the shift spindle (51). Because the bent end of the base end (52r) is displaced inward in the vehicle width direction to the front end (52f), the shift rod (71) is pivotally connected to the front end (52f) of the shift arm (52). By attaching the upper end of the shift rod (71) to the tip end (52f) shifted inward in the vehicle width direction of the shift arm (52), the upper part of the shift rod (71) is moved inward in the vehicle width direction. By tilting, it is possible to secure a wider space above the shift operation lever (62) where the driver's legs are located, and to further improve the driver's straddling property.

  According to the shifting operation mechanism of the straddle-type vehicle-mounted power unit according to claim 8, the functional component (80 in the space formed between the output sprocket cover (45) and the side wall of the crankcase (23) facing each other. ) Is provided, and the functional parts (80) such as sensors are secured using the space between the output sprocket cover (45) and the side wall of the crankcase (23) while ensuring the driver's straddle. It can be arranged efficiently and has a high degree of freedom in layout.

  According to the shifting operation mechanism of the saddle-ride type vehicle-mounted power unit according to claim 9, the shift rod is disposed behind the ACG cover (41) covering the AC generator (40) protruding from the side of the crankcase (23). (71) and the shift rod (71) is disposed inside the outermost end in the vehicle width direction of the ACG cover (41), so that the output sprocket cover ( Even if there is a part exposed outside except the part inserted through the recess of 45), the ACG cover (41) covering the front can effectively protect the link member (71) from external factors such as stepping stones. it can.

1 is an overall side view of a saddle riding type motorcycle according to an embodiment of the present invention. It is a side view of the power unit mounted in the saddle riding type motorcycle. It is a partial top view of the same power unit. It is a partial rear view of the power unit. It is the side view which removed the partial cover member etc. of the power unit. It is an inner surface figure of an output sprocket cover.

Hereinafter, an embodiment according to the present invention will be described with reference to FIGS.
FIG. 1 is a side view of a saddle type motorcycle 1 according to an embodiment to which the present invention is applied.
In the description and claims of the present specification, the front / rear / left / right orientations conform to the front / rear / right / left rules with the straight traveling direction of the saddle riding type motorcycle 1 according to the present embodiment as the front.

  A body frame 2 of the saddle-ride type motorcycle 1 includes a head pipe 3, a main frame 4 that is divided into left and right from the head pipe 3 and extends obliquely rearward, and a lower end bent downward from a rear portion of the main frame 4. A center frame 5 that extends, a down frame 6 that extends downward from the head pipe 3, a seat rail 7 that extends rearward from the main frame 4, and a backstay that connects the lower end of the center frame 5 and the rear end of the seat rail 7. 8 and.

A front wheel 11 is pivotally supported at the lower end of a front fork 10 supported so as to be steerable by the head pipe 3, and a steering handle 12 is connected to the front fork 10.
A rear fork 14 pivotally supported at the front end by a pivot shaft 13 extends rearward at the rear portion of the center frame 5, and a rear wheel 15 pivotally supported at the rear end is provided so as to swing up and down.
A cushion unit 16 is provided between the rear portion of the main frame 4 and the rear fork 13.

  The power unit 20 mounted on the body frame 2 of the saddle-ride type motorcycle 1 includes a manual transmission type multi-speed transmission (hereinafter simply referred to as “transmission”) 31 integrally formed in the rear part of the crankcase 22 of the internal combustion engine 21. The power unit 20 is housed and configured, and is suspended from the front down frame 6, the rear main frame 4, and the center frame 5.

A fuel tank 17 is installed on the main frame 4 above the power unit 20, and a driver's seat 18 is supported by the seat rail 7 behind the fuel tank 16.
A main stand 19m is pivotably mounted at lower ends of the left and right center frames 5, and a side stand 19s is pivotally mounted at a lower portion of the side wall of the left center frame 5.

The internal combustion engine 21 is a water-cooled two-cylinder four-stroke cycle internal combustion engine, and is mounted on the straddle-type motorcycle 1 with its crankshaft 22 oriented in the vehicle width direction (left-right direction).
On the crankcase 23 that rotatably supports the crankshaft 22, the cylinder axis is tilted slightly forward, and the cylinder block 24 and the cylinder head 25 are fastened in a standing posture so that they are stacked one after another. A cylinder head cover 26 is placed on the top.

An intake pipe 27 extends rearward from the cylinder head 25 of the internal combustion engine 21 and is connected to a rear air cleaner 28 via a throttle body (not shown).
An exhaust pipe 29 extending forward from the cylinder head 25 bends downward and further extends rearward and is connected to the rear muffler 30.

Referring to FIG. 5, a main shaft 32 and a counter shaft 33 of a transmission 31 are arranged in parallel with the crankshaft 23 behind the crankshaft 22 that is pivotally supported on the left and right bearing walls of the crankcase 23 of the internal combustion engine 21. The case 23 is pivotally supported on the left and right bearing walls.
The counter shaft 33 is an output shaft of the power unit 20 and, as shown in FIG. 4, protrudes leftward through the left bearing wall, and an output sprocket 34 is fitted to the left end portion thereof.

  The output sprocket 34 is disposed at a position near the front of the pivot shaft 13 that pivotally supports the rear fork 14 of the center frame 5, and between the output sprocket 34 and the driven sprocket 35 fitted to the rear axle of the rear wheel 15. The drive chain 36 is wound around, and the output of the power unit 20 is transmitted to the rear wheel 15 via the drive chain 36 so that the saddle type motorcycle 1 travels (see FIG. 1).

  An AC generator 40 is provided at the left end of the crankshaft 22 that penetrates the left bearing wall of the left and right bearing walls that support the crankshaft 22 of the crankcase 23, and the AC generator 40 that protrudes to the left is provided from the left side. The ACG cover 41 is covered (see FIGS. 4 and 5).

On the other hand, a transmission clutch 42 is provided at the right end portion of the main shaft 32 penetrating the right bearing wall of the crankcase 23, and the clutch cover 43 covers the transmission clutch 42 protruding rightward from the right side.
The output sprocket 34 fitted to the end of the counter shaft 33 protruding leftward from the crankcase 23 is covered with an output sprocket cover 45 from the left side.

The crankcase 23 of the power unit 20 is configured by combining an upper crankcase 23U and a lower crankcase 23L which are divided vertically with a plane including the crankshaft 22 and the counter shaft (output shaft) 33 as a split surface D. Is.
The main shaft 32 is pivotally supported on the left and right bearing walls of the upper crankcase 23U (see FIG. 5).

In the upper crankcase 23U, a shift drive device 50 for switching the shift stage of the transmission 31 is disposed above the transmission 31, and the shift spindle 51 of the shift drive device 50 is positioned above the output sprocket 34. It protrudes through the upper crankcase 23U to the left (see FIG. 5).
A shift arm 52 is fitted to the protruding left end of the shift spindle 51 (see FIG. 2).

The shift spindle 51 is located above the output sprocket 34 (see FIG. 5) and protrudes to the left from the output sprocket 34. As shown in FIGS. The shift arm 52 fitted with the portion (rear end portion) 52r extends forward, and the front end portion (front end portion) 52f is closer to the inner side (right side) of the vehicle body than the rear end portion 52r. The case 23U is located close to the rear left bearing wall 23UL.
That is, the shift arm 52 has a shape in which the rear end portion 52r and the front end portion 52f shifted to the right from the rear end portion 52r are obliquely connected (see FIG. 3).

On the other hand, driver steps 60 are provided on the lower portions of the left and right center frames 5 so as to protrude laterally.
A shift support shaft 61 projecting from the left center frame 5 along the driver step 60 is provided close to the front side of the driver step 60, and the shift operation lever 62 is connected to the shift support shaft 61. A shift operation lever 62 is extended forward by pivotally supporting a base end portion (rear end portion) 62r of the front end (see FIG. 2).

Referring to FIG. 3, the shift operation lever 62 extends forward from the rear end portion 62r that is pivotally supported, bends outward (leftward) in the middle of the vehicle, and further extends obliquely forward to the front end portion 62f.
A shift pedal 63 is attached to a front end portion 62f of the shift operation lever 62 with a base end portion pivotally supported by a pin 64.
The shift pedal 63 swings up and down freely from a state where the shift operation lever 62, which is generally oriented in the front-rear direction, lies backward about the pin 64 to a state where it swings leftward and stands up.

The shift operation lever 62 itself as well as the shift pedal 63 is located farther left than the output sprocket cover 45 (see FIGS. 3 and 4).
The driver step 60 is located behind the ACG cover 41 projecting to the left of the crankcase 23, and the shift pedal 63 is located between the ACG cover 41 and the driver step 60 in the front-rear direction. In the vehicle width direction (left-right direction), the left end portion of the driver step 60 protrudes somewhat to the left of the ACG cover 41 along with the driver step 60.

  With the driver seated on the driver's seat 18 and his left foot placed on the driver's step 60, the toe side of the left foot is placed against the shift pedal 63 and the shift operation lever 62 is moved to the shift support shaft 61. A manual shift operation by the driver is performed by swinging up and down about the center.

The shift operation lever 62 is located to the left of the lower part of the output sprocket cover 45 that covers the output sprocket 34, and the shift operation lever 62 and the shift arm 52 above the output sprocket cover 45 are connected to the shift rod 71 of the link mechanism 70. Are connected.
In other words, the shift rod 71 oriented substantially in the vertical direction is pivotally connected by the link pin 72 protruding rightward from the center portion 62c of the shift operation lever 62 whose bottom end portion 71b is oriented substantially in the front-rear direction. The upper end portion 71t is pivotally connected via a link pin 73 to the front end portion 52f of the shift arm 52 that is substantially oriented in the front-rear direction.

  The four axes of the link pins 72 and 73, the shift spindle 51, and the shift shaft 61 are located at the apexes of a substantially parallelogram in the side view of FIG. 2, and these four axes are shifted to the shift operation lever 62, the shift rod 71, and the shift arm. The link mechanism 70 is configured by connecting 52 in a substantially parallelogram.

  Therefore, when the shift operation with the left foot of the driver is performed and the shift operation lever 62 is swung, the shift operation lever 62 is swung through the shift rod 71 of the link mechanism 70 and the operation power is not swung. When the shift arm 52 is transmitted, the shift spindle 51 is rotated to operate the shift driving device 50 to switch the shift stage of the transmission 31.

  As shown in FIGS. 3 and 4, the link mechanism 70 is located on the left side of the rear left bearing wall 23UL, 23LL of the crankcase 23 and is shifted so as to approach the crankcase 23 from left to right in the vehicle width direction. The pedal 63, the shift operation lever 62, the shift rod 71, and the shift arm 52 are arranged in this order, and the shift rod 71 is tilted inward in the vehicle width direction so as to shift inward in the vehicle width direction from the lower part to the upper part. Inclined and arranged with the upper side of the shift rod 71 close to the center of the vehicle body.

The counter shaft 33 penetrates the upper and lower split surfaces D of the rear left bearing walls 23UL and 23LL of the upper crankcase 23U and the lower crankcase 23L for housing the transmission, and is fitted to the protruding left end of the countershaft 33. The output sprocket 34 is provided along the rear left bearing wall 23UL, 23LL of the crankcase 23.
A shift position sensor 80 for detecting the gear position of the transmission 31 is attached to the rear left bearing wall 23UL of the upper crankcase 23U and obliquely above the output sprocket 34 below the shift spindle 51.

As shown in FIG. 5, the bearing periphery of the counter shaft 33 in the rear left bearing walls 23UL and 23LL of the crankcase 23 has a curved parabola 23g curved in a substantially parabolic shape that opens backward around the bearing circular hole. Is formed to protrude.
Mounting boss portions 23b and 23b for attaching the output sprocket cover 45 are formed in the vicinity of the upper and lower rear ends of the curved protrusion 23g.

A plate-like chain guide member 47 curved in a parabola shape with the rear opened in the same manner is formed on the end surface forming the vertical plane of the curved ridge 23g (the contour is indicated by a two-dot chain line in FIG. The part to which a mark is applied is brought into contact.
The chain guide member 47 is formed with bolt holes 47b and 47b corresponding to the mounting boss portions 23b and 23b.

2 to 4 and 6, the output sprocket cover 45 covering the output sprocket 34 is generally U-shaped so that the upper piece 45U, the side piece 45S, and the lower piece 45L open the crankcase 23 side. The side piece 45S has a trapezoidal shape that gradually expands from the front to the back, and the upper piece 45U and the lower piece 45L are inclined in the opposite directions from the front to the back. And gradually spreading.
Note that the front opening formed by the upper piece 45U, the side piece 45S, and the lower piece 45L is partially covered by the front piece 45F, but the rear opening remains open.

  On the inner surface of the output sprocket cover 45 shown in FIG. 6, projecting ridges 45g and 45g having substantially the same shape facing the curved projecting ridges 23g of the rear left bearing walls 23UL and 23LL of the crankcase 23 are vertically separated and formed. The mounting bolt holes 45b and 45b are drilled corresponding to the upper and lower mounting boss portions 23b and 23b of the curved protrusion 23g.

  The upper piece 45U of the output sprocket cover 45 is located immediately below the shift arm 52, the lower piece 45L is located to the right of the shift operation lever 62, and the front edge of the side piece 45S is attached to the ACG cover 41. Along the rear peripheral surface, cover the output sprocket cover 45 with the output sprocket 34, and attach the output sprocket cover 45 to the rear left bearing wall 23UL, 23LL of the crankcase 23 with the chain guide member 47 interposed therebetween (see FIG. 2). .

  The edge of the upper piece 45U and the edge of the lower piece 45L of the output sprocket cover 45 are brought into contact with or close to the rear left bearing wall 23UL, 23LL of the crankcase 23, and the curved protrusion 23g of the crankcase 23 and the output The output sprocket cover 45 is put on the output sprocket 34 with the chain guide member 47 sandwiched between the upper and lower ridges 45g, 45g of the sprocket cover 45, and at the center of each edge of the upper piece 45U and the lower piece 45L. Bolts 48 and 49 are threaded through the mounting bolt holes 45b and 45b, the upper and lower bolt holes 47b and 47b of the chain guide member 47, and the upper and lower mounting boss portions 23b and 23b of the curved protrusion 23g of the crankcase 23, respectively. The chain guide member 47 is fastened together with the rear left bearing walls 23UL and 23LL of the case 23, and the output sprocket cover 45 is attached.

Accordingly, the output sprocket cover 45 covers the upper and lower left sides of the output sprocket 34 with the rear left bearing wall of the crankcase 23 extending rightward, and the front of the output sprocket 34 is covered by the ACG cover 41 together with the front piece 45F. Only the rear side of the output sprocket 34 is opened, and the drive chain 36 wound around the output sprocket 34 extends rearward from the opened opening.
A chain guide member 47 covers and guides the periphery of the drive chain 36 wound around the output sprocket 34 from the top to the front and downward.

The output sprocket cover 45 is formed in a substantially half-cylindrical semicylindrical recess 46 that is oriented in the vertical direction at the approximate center in the front-rear direction and is recessed inward in the vehicle width direction.
The semi-cylindrical concave portion 46 extends vertically from the upper piece 45U through the side piece 45S to the lower piece 45L and is inclined slightly forward, and as the vehicle goes from the lower part to the upper part. The amount of protrusion (depth) that protrudes inward in the width direction gradually increases (see FIG. 4).
That is, the semi-cylindrical recess 46 oriented substantially in the vertical direction is inclined so as to fall inward in the vehicle width direction.

Referring to FIG. 2, the upper end portion 71t of the shift rod 71 linked to the shift arm 52 is provided above the upper recess portion opening 46t that opens above the upper piece 45U having the largest protrusion amount of the semicylindrical recess portion 46. The lower end portion 71b of the shift rod 71 linked to the shift operation lever 62 is located to the left of the lower opening 46b of the concave portion that is located and opens below the lower piece 45L with the smallest protruding amount of the semicylindrical concave portion 46. The shift rod 71 inclined so as to fall inward in the vehicle width direction is inserted through the semi-cylindrical recess 46 inclined so as to fall inward in the vehicle width direction (see FIG. 4).
As shown in FIG. 4, a part of the upper side of the shift rod 71 is inserted through the upper part of the semicylindrical recess 46, and the part below the insertion part protrudes leftward from the semicylindrical recess 46.

  A driver who sits on the driver's seat 18 straddling the saddle riding type motorcycle 1 equipped with the power unit 20 as described above gets on the driver's step 60 and rides, and the left foot is The tip of the foot is in a position to operate the shift pedal 63 below the output sprocket 34. Therefore, the leg portion of the left foot is directed in the vertical direction inclined forward along the side piece 45S (and the shift rod 71) of the output sprocket cover 45. Is located.

  In the output sprocket cover 45, the shift rod 71 is inserted from the lower part to the upper part by inserting the upper part into the semi-cylindrical concave part 46 that gradually increases inward in the vehicle width direction as it goes from the lower part to the upper part. Since it is inclined and arranged in the vehicle width direction so that it shifts inward in the vehicle width direction as it goes, it is above the lower side in the space around the driver's legs on the side of the output sprocket cover 45 More space can be secured, and the driver's straddling ability can be improved.

  As shown in FIG. 3, the shift arm 52 bends in the middle of extending forward from the base end 52r fitted to the shift spindle 51 and shifts inward in the vehicle width direction from the base end 52r. Since the upper end portion of the shift rod 71 is pivotally connected to the distal end portion 52f that reaches the distal end portion 52f and is shifted inward in the vehicle width direction of the shift arm 52, the upper portion of the shift rod 71 is inclined inward in the vehicle width direction. Thus, it is possible to secure a wider space above the shift operation lever 62 where the driver's legs are located, and to further improve the driver's straddling property.

  Since the shift rod 71 is inserted through the upper recess upper opening 46t where the upper portion of the semi-cylindrical recess 46 protrudes inwardly in the vehicle width direction, the upper portion of the shift rod 71 is in the semi-cylindrical recess 46. The shift rod 71 is tilted in the vehicle width direction to improve the straddling property, and the shift rod 71 can be protected from a stepping stone kicked up by the front and rear wheels 11 and 15 from the vehicle front-rear direction. it can.

  In addition, since the shift rod 71 is disposed behind the ACG cover 41 that covers the AC generator 40 protruding from the side of the crankcase 23, the shift rod 71 is provided with the semi-cylindrical recess 46 of the output sprocket cover 45. Even if there is a portion exposed to the outside other than the portion to be inserted, the ACG cover 41 covering the front can effectively protect the link member (71) from external factors such as stepping stones.

  One end of the shift rod 71 is pivotally connected to the shift operation lever 62 from the inner side in the vehicle width direction by a link pin 72, and the other upper end is pivotally connected to the shift arm (52) from the outer side in the vehicle width direction by a link pin 73. Therefore, the lower end of the shift rod (71) that is inserted through the semi-cylindrical recess 46 of the output sprocket cover 45 and is pivotally attached to the shift arm 52 from the outside in the vehicle width direction via the link pin 73 is shifted at the lower end. Since the lever (62) is located on the inner side in the vehicle width direction, it can be easily attached to the shift operation lever (62) from the inner side in the vehicle width direction via the link pin 72, and the assembling property is good.

Since the shift position sensor 80 is disposed in the space formed between the output sprocket cover 45 and the rear left bearing wall 23UL, 23LL facing each other, while ensuring the driver's straddle, The shift position sensor 80 can be efficiently arranged using the space between the output sprocket cover 45 and the rear left bearing wall 23UL, 23LL of the crankcase 23, and the degree of freedom in layout is great.
In addition to the shift position sensor 80, other sensors and functional parts can be efficiently arranged.

1 ... saddle riding type motorcycle,
20 ... Power unit, 21 ... Internal combustion engine, 22 ... Crankshaft, 23 ... Crankcase, 23U ... Upper crankcase, 23L ... Lower crankcase,
31 ... transmission, 32 ... main shaft, 33 ... counter shaft (output shaft), 34 ... output sprocket, 35 ... driven sprocket, 36 ... drive chain,
40 ... AC generator, 41 ... ACG cover, 45 ... Output sprocket cover, 46 ... Semi-cylindrical recess, 47 ... Chain guide member,
50: Variable speed drive, 51: Shift spindle, 52: Shift arm, 60: Driver step, 61 ... Shift support shaft, 62 ... Shift operation lever, 63 ... Shift pedal, 64 ... Pin, 70 ... Link mechanism, 71 ... shift rod, 72, 73 ... link pin, 80 ... shift position sensor.

Claims (9)

A power unit (20) housing a transmission (31) in a crankcase (23) of an internal combustion engine (21) is mounted on a body frame (2) of a saddle-ride type vehicle (1),
The output shaft (33) of the power unit (20) is provided to protrude through the crankcase (23) outward in the vehicle width direction,
An output sprocket (34) is fitted to the protruding end of the output shaft (33),
The output sprocket (34) is covered from the side by an output sprocket cover (45),
A shift drive device (50) for switching the gear position of the transmission (31) is provided in the crankcase (23),
A shift operation member (62, 63) pivotally supported by the body frame (2) is provided at the lower rear of the power unit (20),
In the shift operation mechanism of the straddle-type vehicle-mounted power unit in which the swing of the shift operation member (62, 63) due to the shift operation is transmitted to the shift drive device (50) via the link mechanism (70),
In the link mechanism (70), a shift rod (71) connects the shift operation member (62, 63) and a shift arm (52) fitted to a shift spindle (51) of the transmission drive device (50). To transmit operating power,
The shift rod (71) overlaps the output sprocket cover (45) in a side view,
The output sprocket cover (45) is recessed inward in the vehicle width direction to form a recess (46),
At least a part of the shift rod (71) is inserted into the recess (46) of the output sprocket cover (45).   The shift rod (71) is oriented substantially in the vertical direction, and is disposed to be inclined in the vehicle width direction so as to shift inward in the vehicle width direction from the lower part toward the upper part. A gear shift operation mechanism for a power unit mounted on a saddle-ride type vehicle according to Item 1.   The concave portion (46) of the output sprocket cover (45) is a half-cylindrical semi-cylindrical concave portion (46) substantially parallel to the shift rod (71), and the output sprocket cover as it goes from the lower part to the upper part. The shift operation mechanism for a power unit mounted on a straddle-type vehicle according to claim 2, characterized in that the amount of protrusion that protrudes inward in the vehicle width direction of (45) gradually increases. The shift arm (52) is disposed above the output sprocket (34),
The shift operation member (62, 63) is a shift operation lever (62) having a shift pedal (63) at an end, and is disposed below the output sprocket (34). A gear shifting operation mechanism for a power unit mounted on a saddle-ride type vehicle according to claim 2 or claim 3.   5. The straddle-type vehicle-mounted power unit according to claim 2, wherein an upper portion of the shift rod (71) is inserted through an upper portion of the semi-cylindrical recess (46). Shifting operation mechanism.   The shift rod (71) has one lower end pivotally connected to the shift operation lever (62) from the inside in the vehicle width direction, and the other upper end pivotally connected to the shift arm (52) from the outside in the vehicle width direction. 6. The speed change operation mechanism for a saddle-ride type vehicle-mounted power unit according to claim 4 or 5, wherein: The shift arm (52) is bent in the middle of extending forward from a base end (52r) fitted to the shift spindle (51) and biased inward in the vehicle width direction from the base end (52r). To the transferred tip (52f)
The saddle riding type vehicle mounting according to any one of claims 4 to 6, wherein the shift rod (71) is pivotally connected to the tip end portion (52f) of the shift arm (52). Power unit shift operation mechanism.   The functional component is disposed in a space formed between the output sprocket cover (45) and the side wall of the crankcase (23) facing each other. A shift operation mechanism for a power unit mounted on a straddle-type vehicle according to claim 1. The shift rod (71) is disposed behind the ACG cover (41) covering the AC generator (40) protruding from the side of the crankcase (23), and
The saddle riding according to any one of claims 1 to 8, wherein the shift rod (71) is disposed inside an outermost end of the ACG cover (41) in the vehicle width direction. Gear shifting operation mechanism for a power unit mounted on a vehicle.

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