JP2018128089A - Speed change gear of saddle-riding type vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a speed change gear of a saddle-riding type vehicle that is made lightweight by forming a shaft hole in a change pedal, and can restrict a change spindle from moving axially with a simple structure, has excellent assemblability, and can reduce costs.SOLUTION: A speed change gear of a saddle-riding type vehicle is characterized in that a change spindle 54 has a shaft 54a formed around the center of a shaft so as to have a shaft hole opening at least at one shaft end part; the shaft hole opening at the one shaft end part of the change spindle 54 is closed with a closing member 65; and a position restriction boss part 7B projecting from an inner surface of a case cover 7 perpendicularly to a shaft end face of the change spindle 54 abuts on the closing member 65 to restrict the change spindle 54 from moving axially.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a transmission for a saddle-ride type vehicle that performs a shift by rotating a change spindle.

The change spindle needs to rotate at a predetermined position in the axial direction in order to operate accurately, and thus movement in the axial direction (thrust direction) is restricted.
Generally, a retaining ring is used to restrict the movement of the change spindle in the axial direction (see, for example, Patent Document 1 and Patent Document 2).

Japanese Patent No. 4322588 JP-A-6-117533

  In the change spindle support structure disclosed in Patent Document 1, two retaining rings are engaged with the change spindle so as to restrict the movement of the change spindle in both the left and right directions in the axial direction (left and right direction).

  In the change spindle support structure disclosed in Patent Document 2, movement of the change spindle in one direction in the axial direction is restricted by a retaining ring, and movement in the other direction protrudes from the inner surface of the case cover that covers the shaft end of the change spindle. The position restricting boss portion is in contact with the end surface of the change spindle for restriction.

  When the retaining ring is used, a groove in which the retaining ring fits must be accurately formed at a position along the bearing portion of the change spindle. When two retaining rings are used as in Patent Document 1, Processing accuracy is also required, and it is not easy to assemble, resulting in high costs.

  In exchange for that, Patent Document 2 has a simple structure in which a position restricting boss is formed on the case cover because movement in the other direction of the change spindle is restricted by a position restricting boss protruding from the inner surface of the case cover. Assembling is easy, cost can be reduced, and even if a large force is applied in the axial direction, it can be reliably received.

However, in Patent Document 2, since the position restriction boss part abuts on the end surface of the change spindle to restrict the movement of the change spindle in the axial direction, the change spindle is formed solid, and the shaft hole has an opening in the shaft hole. Absent.
For this reason, a shaft hole cannot be formed in the center of the shaft of the change spindle, and the weight cannot be reduced.

  The present invention has been made in view of the above points. The purpose of the present invention is to reduce the weight by providing a shaft hole in the change pedal and to reliably restrict the movement of the change spindle in the axial direction with a simple structure. The present invention is to provide a transmission for a saddle-ride type vehicle that has good assemblability and can reduce costs.

In order to achieve the above object, a transmission for a saddle-ride type vehicle according to the present invention includes:
In a saddle-ride type vehicle transmission that changes speed by changing a gear pair that transmits power of a transmission by movement of a shift fork guided by the shift drum by rotation operation of the change spindle,
The shift drum and the change spindle parallel to each other are rotatably supported by a pair of bearing walls facing each other in a transmission case that houses the transmission,
The change spindle is formed with an axial hole at the center of the shaft and an axial hole opening at at least one axial end.
A shaft end portion having a shaft hole opening that penetrates one bearing wall of the transmission case of the change spindle is covered with a case cover that covers a side of the transmission case,
A shaft hole opening at one shaft end of the change spindle is closed by a closing member,
A position restricting boss projecting perpendicularly to the shaft end face of the change spindle from the inner surface of the case cover is in contact with the closing member to restrict movement of the change spindle in the axial direction.

  According to this configuration, the change spindle has a shaft hole formed in the center of the shaft to reduce the weight, and the inner surface of the case cover is attached to the closing member that blocks the shaft hole opening at one shaft end of the change spindle. Since the position restriction boss projecting perpendicularly to the shaft end face of the change spindle comes into contact with the blocking member and the movement of the change spindle in the axial direction is restricted, the movement of the change spindle can be reliably restricted with a simple structure, Assemblability is good and the cost can be reduced.

In the above configuration,
The closing member may include a shaft portion that is fitted into the shaft hole of the change spindle, and a flange portion that is formed to extend radially outward from a shaft end portion of the coaxial portion.

  According to this configuration, the closing member includes the shaft portion that is fitted into the shaft hole of the change spindle and the flange portion that is formed to extend radially outward from the shaft end portion of the coaxial portion. The shaft part is fitted into the shaft hole of the change spindle, the flange part is in contact with the shaft end surface of the change spindle, and the closing member can be easily attached to the change spindle, resulting in excellent assembly and improved productivity. Can do.

In the above configuration,
The change spindle is made of a ferrous metal,
The closing member may be made of the same iron-based metal as the change spindle.

  According to this configuration, since the change spindle and the closing member are made of the same iron-based metal, the difference in thermal expansion between them is reduced, so that the closing member is always stably secured to the change spindle against temperature changes. Can be attached.

In the above configuration,
The position restricting boss portion may be formed coaxially with the rotation center axis of the change spindle.

  According to this configuration, since the position restricting boss portion is formed coaxially with the rotation center axis of the change spindle, the position restricting boss portion of the end face of the flange portion of the closing member attached to the shaft end portion of the change spindle. Since the sliding contact surface that comes into contact with and is in sliding contact is a part of the surface with a small amount of rotation in the vicinity of the rotation center axis, the wear amount of the position restricting boss portion can be reduced, and durability can be improved. .

In the above configuration,
There may be a plurality of types of the closing member having different flange portions.

  According to this configuration, there are a plurality of types of closing members having different thicknesses of the flange portion. Therefore, even in a transmission in which the assembly position of the transmission case and the case cover is different, the flange portion has an appropriate thickness. If the closing member is used, the change spindle can be shared.

  In the present invention, a shaft hole is formed in the shaft center of the change spindle to reduce the weight, and the change spindle from the inner surface of the case cover to the closing member that blocks the shaft hole opening at one shaft end of the change spindle. Because the position restricting boss projecting perpendicularly to the shaft end surface of the change spindle contacts the shaft end surface of the shaft and the movement of the change spindle in the axial direction is restricted, the movement of the change spindle is reliably restricted with a simple structure. In addition, the assemblability is good and the cost can be reduced.

1 is a right side view of a power unit including a transmission for a saddle-ride type vehicle according to an embodiment of the present invention. It is II-II arrow sectional drawing of FIG. FIG. 3 is a cross-sectional view taken along the line III-III in FIG. 1. It is a right view of the power unit which removed the right crankcase cover. It is an internal view of a right crankcase cover. It is a principal part expanded sectional view of a transmission. It is a principal part expanded sectional view of another transmission. It is a principal part expanded sectional view of another transmission. It is an IX arrow line view of a closure member in Drawing 8.

Hereinafter, an embodiment according to the present invention will be described with reference to FIGS.
FIG. 1 is a right side view of a power unit P that is integrally provided with an internal combustion engine E with a transmission M according to an embodiment to which the present invention is applied.
The power unit P is mounted on a saddle riding type vehicle.
In the description of the present specification, the front, rear, left, and right directions are based on a normal standard in which the straight traveling direction of the saddle riding type vehicle according to the present embodiment is the front. In the drawings, FR is the front and RR is the rear. , LH indicates the left side, RH indicates the right side, UP indicates the upper side, and DN indicates the lower side.

  Referring to FIG. 1, a cylinder block 3 and a cylinder head 4 are sequentially stacked and fastened obliquely above a crankcase 2 that rotatably supports a crankshaft 10 oriented in the left-right direction of the internal combustion engine E. A cylinder head cover 5 is placed on the cylinder head 4, and the cylinder block 3, the cylinder head 4, and the cylinder head cover 5 protrude from the crankcase 2 so as to be inclined forward slightly.

A piston 18 is slidably fitted into the cylinder block 3 projecting obliquely upward from the crankcase 2 with reference to FIG. 2, and the piston 18 is connected to the crank webs 10w, 10w of the crankshaft 10 via a connecting rod 19. The crankshaft 10p is connected to the crankpin 10p installed between them, and the crankshaft 10 is driven to rotate according to the movement of the piston 18.
A combustion chamber 20 is formed below the cylinder head 4 and above the piston 18.
A valve operating mechanism (not shown) for driving an intake / exhaust valve that opens and closes the intake / exhaust port opening of the combustion chamber 20 is provided in the cylinder head 4.

Referring to FIG. 2, crankcase 2 is configured to be divided into left and right halves, and a case internal space is formed between left crankcase 2L and right crankcase 2R.
The space in the case is a space formed between the left and right vertical bearing walls 2Lv and 2Rv facing each other and surrounded by the case outer peripheral walls 2Ls and 2Rs, and the crank chamber 2C in which the crank web 10w of the crankshaft 10 is accommodated and the speed change. The transmission chamber 2M in which the device M is accommodated is located in front and back to communicate with each other to form one space.

In the transmission M, a constantly meshing gear transmission 11 is disposed behind the crankshaft 10.
Therefore, the crankcase 2 also serves as a transmission case.

The left crankcase cover 6 and the right crankcase cover 7 cover the left and right outer sides of the left crankcase 2L and the right crankcase 2R, and the AC generator 29 is accommodated in the generator chamber 9 in the left crankcase cover 6 so that the right crankcase A transmission clutch 30 is accommodated in the clutch chamber 8 in the cover 7.
The clutch chamber 8 communicates with the transmission chamber 2M.

The outer root of the crank web 10w of the crankshaft 10 is pivotally supported via metal bearings on the left and right vertical bearing walls 2Lv and 2Rv of the left crankcase 2L and the right crankcase 2R facing each other.
An AC generator 29 is provided on the left side of the crankshaft 10 protruding leftward from the left vertical bearing wall 2Lv, and the AC generator 29 is covered with the left crankcase cover 6.

  Referring to FIG. 2, the main shaft 12 and the countershaft 13 of the constantly meshing gear transmission 11 are a bearing 12b between the left and right bearing walls extending rearward of the left and right vertical bearing walls 2Lv and 2Rv of the left and right crankcases 2L and 2R. , 12b, 13b, 13b, the drive gear train 12g supported by the main shaft 12 and the driven gear train 13g supported by the countershaft 13 always mesh with the corresponding gears, and the transmission chamber 2M.

A shift clutch 30 that is a multi-plate friction clutch is provided on the right side of the main shaft 12 that passes through the right vertical bearing wall 2Rv to the right and protrudes into the clutch chamber 8.
An output sprocket 16 is fitted to the countershaft 13 at the left end that protrudes to the outside through the left vertical bearing wall 2Lv.
A rear-wheel drive chain 17 is wound around the output sprocket 16.

The main shaft 12 and the countershaft 13 are parallel to the crankshaft 10, and referring to FIGS. 1 and 4, the main shaft 12 is located obliquely above and behind the crankshaft 10, and further behind the main shaft 12. The counter shaft 13 is located slightly diagonally below.
A balancer shaft 15 is provided in front of the crankshaft 10 in parallel with each other.

  Referring to FIG. 2, the balancer drive gear 21, the cam chain drive sprocket 22, and the primary drive gear 23 are cranked on the right side of the crankshaft 10 protruding rightward from the right vertical bearing wall 2Rv in order from left to right. The shaft 10 is fitted so as to rotate integrally.

The balancer drive gear 21 meshes with a balancer driven gear (not shown) fitted to the balancer shaft 15 in front of the crankshaft 10 to transmit power.
A cam chain 22 c is wound around the cam chain drive sprocket 22 so as to transmit power to a valve mechanism provided at the upper part of the cylinder head 4.
The primary drive gear 23 meshes with a primary driven gear 24 supported by a clutch outer 31 of a speed change clutch 30 provided on the right side of the main shaft 12 to transmit power (see FIG. 2).

  2 and 3, a clutch outer 31 of a speed change clutch 30 which is a multi-plate friction clutch forms a bottomed cylindrical body with a bottom portion 31b and a cylindrical portion 31c, and is a circle formed in the center of the bottom portion 31b. The hole is rotatably fitted to the cylindrical base of the primary driven gear 24 and is rotatably supported around the main shaft 12, and is connected to the primary driven gear 24 in the circumferential direction via a damper spring 25. Yes.

A clutch inner 32 disposed inside the cylindrical portion 31 c of the clutch outer 31 is spline-fitted to the main shaft 12 and rotates integrally with the main shaft 12.
The clutch inner 32 has a pressure receiving portion 32b facing the bottom portion 31b of the clutch outer 31 and a concentric cylindrical portion 32c facing the cylindrical portion 31c, and the cylindrical portion of the clutch inner 32 is located inside the cylindrical portion 31c of the clutch outer 31. A plurality of friction disks 33 and clutch disks 34 are alternately inserted into the annular space outside 32c.

The friction disk 33 is fitted to the cylindrical portion 31 c of the clutch outer 31 so as to be slidable in the axial direction, and rotates integrally with the clutch outer 31.
Further, the clutch disk 34 inserted alternately with the friction disk 33 is fitted to the cylindrical portion 32c of the clutch inner 32 so as to be slidable in the axial direction, and rotates integrally with the clutch inner 32.

  The pressure plate 35 is rotatably supported via a bearing 38 on a flange portion 37f of a lifter rod 37 that is slidably inserted into a hollow portion formed in the main shaft 12, and is caused by the spring force of the clutch spring 36. The pressure plate 35 presses the outermost friction disk 33 from the outside, and presses the friction disk 33 and the clutch disk 34 alternately inserted between the pressure receiving portions 32b of the clutch inner 32 so as to sandwich the friction disk 33 from both sides. The transmission clutch 30 is engaged by friction between the clutch 33 and the clutch disk 34.

Referring to FIG. 4, a speed change drive mechanism 50 is configured in a space below the main shaft 12 and the counter shaft 13.
A fork shaft 51 is located below the main shaft 12 at substantially the same height as the crankshaft 10, and a shift drum 52 is provided between the left and right vertical bearing walls 2Lv and 2Rv of the crankcase 2 below the fork shaft 51 (see FIG. 3). The shift fork 53 supported by the fork shaft 51 is moved in the axial direction by the rotation of the shift drum 52, and each meshing of the driving gear train 12g and the driven gear train 13g of the constantly meshing gear transmission 11 is performed. A gear pair that effectively transmits power is selected from the matched gear pairs to perform a shift.

Referring to FIGS. 3 and 4, a change spindle 54 is installed on the left and right vertical bearing walls 2 </ b> Lv and 2 </ b> Rv below and obliquely below and below the shift drum 52.
The change spindle 54 is fitted with a change pedal 55 at an end portion that protrudes leftward from the left vertical bearing wall 2Lv and is exposed to the outside.
A master arm 57 of a gear change mechanism 56 is fitted to the end of the change spindle 54 that protrudes rightward through the right vertical bearing wall 2Rv of the change spindle 54 and protrudes into the clutch chamber 8 in the right crankcase cover 7. Swings together.

Referring to FIG. 6 which is an enlarged cross-sectional view of the main part of the transmission M, the coil portion of the return spring 58 is wound around the change spindle 54, and both end portions extending in the same direction serve as the locking pieces 57e of the master arm 57. It is attached so as to be pinched from the outside.
A pin 59 projects from the right vertical bearing wall 2Rv between both ends of the return spring 58.
Therefore, when the change spindle 55 is rotated by the operation of the change pedal 55 and the master arm 57 is swung, a biasing force is applied to return the master arm 57 to the neutral position by the return spring 58.

  Accordingly, the change spindle 55 is rotated by the operation of the change pedal 55 and the master arm 57 is swung, so that the shift drum 52 is rotated by the gear change mechanism 56 and the shift forks 53a, 53b, 53c are interposed. After selecting a gear pair that effectively transmits power from among the meshing gear pairs of the constantly meshing gear transmission 11, the master arm 57 is returned to the neutral position by the return spring 58, and the change spindle Return 54 to its original pivot position.

  The change spindle 54 is rotatably supported by the left and right vertical bearing walls 2Lv and 2Rv, and is mounted on the right side surface of the bearing portion of the right vertical bearing wall 2Rv via a washer 61. And the movement of the change spindle 54 in the left direction is restricted.

The change spindle 54 is made of an iron-based metal, and a long shaft hole 54a is formed at the center of the shaft for weight reduction. The shaft hole 54a is elongated from the vicinity of the left end of the change spindle 54 to the right end opening. Is formed.
The opening of the right spindle end surface of the change spindle 54 is closed by the closing member 65.
Referring to FIG. 6, the closing member 65 is made of the same iron-based metal as the change spindle 54, and has a shaft portion 65 a inserted into the shaft hole 54 a of the change spindle 54, and a radially outer side at the shaft end portion of the coaxial portion 65 a. And a flange portion 65b formed in a disc shape.
An inner pressure release hole 65h penetrating the shaft center is formed in the shaft portion 65a of the closing member 65.

The closing member 65 is simply attached to the right end portion of the change spindle 54 by fitting the shaft portion 65 a into the shaft hole 54 a of the change spindle 54 and abutting the flange portion 65 b against the shaft end surface of the change spindle 54.
Since the blocking member 65 has an inner pressure release hole 65h formed in the shaft portion 65a, the shaft portion 65a of the blocking member 65 is easily fitted into the shaft hole 54a in which one end of the change spindle 54 is blocked.

The right crankcase cover 7 that covers the right side of the right crankcase 2R is made of an aluminum alloy and is formed in a generally bowl shape with a cover outer wall 7v and a cover outer peripheral wall 7s, and a mating surface 7g ( 5) is abutted against the right mating surface 2Rg (see FIG. 4) of the annular frame wall 2Rt of the right crankcase 2R, and the transmission clutch 30 is accommodated therein and fixed to the right crankcase 2R.
The right end portion of the change spindle 54 is also covered with the right crankcase cover 7.

  The closing member 65 attached to the right end portion of the change spindle 54 has a thickness of the flange portion 65b so that the end surface of the flange portion 65b is flush with the right mating surface 2Rg of the annular frame wall 2Rt of the right crankcase 2R. Axial width D1 is set.

  5 and 6, the right crankcase cover 7 that covers the right outer side of the right crankcase 2R is perpendicular to the shaft end surface of the change spindle 54 from the inner surface of the cover outer wall 7v and rotates the change spindle 54. A position regulating boss portion 7B is formed on the same axis as the moving center axis Lc so as to protrude toward the right axis end surface.

  The position restricting boss portion 7B has a cylindrical shape, and the front end surface (left end surface) of the position restricting boss portion 7B is on the same plane as the mating surface 7g that is the end surface of the cover outer peripheral wall 7s, and the right crankcase cover 7 is on the right side. When attached to the crankcase 2R, the front end surface of the position restricting boss portion 7B comes into contact with the flange portion 65b of the closing member 65 attached to the right end portion of the change spindle 54.

  The center axis of the columnar body of the position restricting boss portion 7B coincides with the rotation center axis Lc of the change spindle 54, and the position restricting boss portion 7B is located on the end surface of the flange portion 65b of the closing member 65. It abuts on a partially circular surface including the rotation center axis Lc.

Accordingly, in the change spindle 54, the tip of the position restricting boss portion 7B of the right crankcase cover 7 is brought into contact with the closing member 65 attached to the right end portion, so that the right movement of the change spindle 54 is restricted.
Since the movement of the change spindle 54 in the left direction is restricted by the retaining ring 60 and the movement in the right direction is restricted by the position restricting boss portion 7B, the change spindle 54 is restricted from moving in either the left or right direction and can turn freely. Positioned.

  When the change spindle 54 is rotated by operating the change pedal 55 fitted to the left end portion of the change spindle 54, even if a force that pushes the change spindle 54 rightward in the axial direction is applied, the right crankcase cover 7 The position regulating boss portion 7B can reliably regulate the movement of the change pedal 55 to the right.

As described above, the embodiment of the transmission of the saddle-ride type vehicle according to the present invention described in detail has the following effects.
As shown in FIG. 3, a shaft hole 54 a is formed in the center of the change spindle 54 to reduce the weight, and a closing member 65 that closes the shaft hole opening at one shaft end of the change spindle 54 is provided. Since the position restricting boss 7B protruding perpendicularly from the inner surface of the right crankcase cover 7 to the shaft end face of the change spindle 54 comes into contact with the change spindle 54, the movement of the change spindle 54 is restricted. It can be regulated reliably with a simple structure, has good assemblability, and can reduce costs.

  As shown in FIG. 6, the closing member 65 includes a shaft portion 65a that is fitted into the shaft hole 54a of the change spindle 54, and a flange portion 65b that is formed to extend radially outward from the shaft end portion of the coaxial portion 65a. Therefore, the closing member 65 can be easily attached to the change spindle 54 by fitting the shaft portion 65a into the shaft hole 54a of the change spindle 54 and contacting the flange portion 65b to the shaft end surface of the change spindle 54. It can be attached to the surface, and it is excellent in assemblability and productivity can be improved.

  Since the change spindle 54 and the closing member 65 are made of the same iron-based metal, the difference in thermal expansion between them is reduced, and the closing member 65 is always securely attached to the change spindle 54 against temperature changes. I can leave.

  As shown in FIG. 6, the position restricting boss 7 </ b> B is formed coaxially with the rotation center axis Lc of the change spindle 54, so that the iron-based metal closing member attached to the shaft end of the change spindle 54 is used. Of the end faces of the flange portion of 65, the slidable contact surface with which the aluminum alloy position restricting boss portion 7B comes into contact and is in sliding contact is a partial surface with a small amount of rotation in the vicinity of the rotation center axis Lc. Durability can be improved by reducing the amount of wear at the tip of the boss portion 7B.

The closing member may be a resin or aluminum member that is self-lubricating with respect to the change spindle that is an iron-based metal.
Resin and aluminum have a higher coefficient of thermal expansion than iron, so that when thermally expanded, the state in which the shaft portion of the closing member is inserted into the shaft hole of the change spindle is tightened more tightly without loosening.

Next, an example in which the change spindle 54 is used in another type of transmission device in which the crankcase (transmission case) and the crankcase cover are assembled at different positions will be described with reference to FIG.
The transmission 80 is configured such that the right crankcase cover 82 corresponding to the right crankcase cover 7 covers the right side of the right crankcase 81 corresponding to the right crankcase 2R, and the right crankcase 81 and the right crankcase The mating surfaces of the cover 82 are at positions offset to the right from the mating surfaces of the right crankcase 2R and the right crankcase cover 7.

In order to share the change spindle 54 in the transmission 80, the closing member 85 attached to the right end portion of the change spindle 54 is formed in a disk shape extending radially outward at the shaft end portion of the shaft portion 85a. When the thickness (axial width) D2 of the flange portion 85b is made thicker than the thickness D1 of the flange portion 65b of the closing member 65 and attached to the right end portion of the change spindle 54, the annular frame wall of the right crankcase 81 It should be flush with the 81t right mating surface.
The shaft 85a is formed with an internal pressure release hole 85h.

  By using the closing member 85, when the right side of the right crankcase 81 is covered with the right crankcase cover 82, the right crankcase cover 82 projects vertically from the inner surface of the cover outer wall 82v of the right crankcase cover 82 to the right shaft end surface of the change spindle 54. The distal end of the position restricting boss portion 82B is brought into contact with the end surface of the flange portion 85b of the closing member 85, and the rightward movement of the change spindle 54 can be restricted.

  Therefore, by preparing a plurality of types of blocking members having different flange thicknesses, even when the transmission case and the case cover are assembled in different positions, the blocking member having an appropriate thickness in the flange portion. If is selected and used, the change spindle can be shared and the movement of the change spindle can be easily regulated without changing the right crankcase cover.

Another example will be described with reference to FIGS.
The present transmission 90 is configured such that a right crankcase cover 92 corresponding to the right crankcase cover 7 covers the right side of the right crankcase 91 having the same shape as the right crankcase 2R.

The change spindle pivotally supported by the right crankcase 91 is the same as the change spindle 54, and the gear change mechanism 56 is also the same.
Therefore, the same code is used.

From the inner surface of the right crankcase cover 92, a position restricting boss portion 92B is formed so as to protrude perpendicularly to the shaft end surface of the change spindle 54.
The front end surface of the position regulating boss portion 92B is flush with the mating surface of the right crankcase cover 92 with the right crankcase 91.

As shown in FIG. 8, the position restricting boss portion 92 </ b> B is not coaxial with the rotation center axis Lc of the change spindle 54 and is offset.
The closing member 95 attached to the shaft end portion of the change spindle 54 includes a shaft portion 95a fitted into the shaft hole 54a of the change spindle 54, and a flange portion 95b extending radially outward from the shaft end portion of the coaxial portion 95a. Consists of.
The shaft portion 95a is formed with an internal pressure release hole 95h that penetrates the shaft center.

Referring to FIG. 9, the flange portion 95 b of the closing member 95 is formed with a fan-shaped portion 95 bb extending from a circular portion 95 ba that contacts the shaft hole opening end surface of the change spindle 54 and extending in a fan shape.
The fan-shaped portion 95bb is thicker on the inner side in the axial direction than the circular portion 95ba, and an arc-shaped concave portion 95c into which the cylindrical portion of the change spindle 54 is press-fitted at the boundary between the circular portion 95ba and the fan-shaped portion 95bb. Is formed.

  Referring to FIG. 8, the closing member 95 is configured such that the cylindrical portion of the change spindle 54 is press-fitted into the concave portion 95c while the shaft portion 95a is fitted into the shaft hole 54a of the change spindle 54 and the flange portion 95b is inserted into the shaft end surface of the change spindle 54. Is attached to the right end portion of the change spindle 54 at a predetermined rotation angle at which the fan-shaped portion 95bb of the flange portion 95b faces the position restricting boss portion 92B offset from the rotation center axis Lc of the change spindle 54.

Therefore, when the right crankcase cover 92 is attached to the right crankcase 91, as shown in FIG. 8, the front end surface of the position restricting boss portion 92B is formed by the closing member 95 attached to the right end portion of the change spindle 54. It contacts the fan-shaped portion 95bb of the flange portion 95b.
In the change spindle 54, the tip of the position restricting boss portion 92B of the right crankcase cover 92 is brought into contact with the fan-shaped portion 95bb of the flange portion 95b of the closing member 95 attached to the right end portion. Movement is restricted.

  The rotation of the change spindle 54 at the time of shifting causes the closing member 95 to rotate integrally. Therefore, the fan-shaped portion 95bb of the flange portion 95b of the closing member 95 is in sliding contact with the tip of the position restricting boss portion 92B. The movement of the change spindle 54 is restricted via 95.

  Even in a transmission in which the position restricting boss portion is offset with respect to the rotation center axis Lc of the change spindle, by using a closing member having a fan-shaped portion on the flange portion, the change spindle is shared and the right crankcase cover is The movement of the change spindle can be easily regulated without changing it.

  Even in the right crankcase cover in which the position restricting boss portion is offset in a different direction with respect to the rotation center axis Lc of the change spindle, the closing member 95 is configured such that the fan-shaped portion 95bb of the flange portion 95b faces the position restricting boss portion. If it is attached to the change spindle at a rotation angle, the movement of the change spindle can be restricted, which is versatile.

  As mentioned above, although the transmission of the saddle-ride type vehicle according to the embodiment of the present invention has been described, the aspect of the present invention is not limited to the above-described embodiment, and is various in the scope of the gist of the present invention. Including what is implemented.

P ... Power unit, E ... Internal combustion engine, 2 ... Crankcase (transmission case), 2L ... Left crankcase, 2R ... Right crankcase, 2Lv, 2Rv ... Vertical bearing wall, 2C ... Crank chamber, 2M ... Transmission chamber, 3 ... Cylinder block, 4 ... Cylinder head, 5 ... Cylinder head cover, 6 ... Left crankcase cover, 7 ... Right crankcase cover (clutch cover), 7B ... Position regulating boss, 7s ... Cover outer peripheral wall, 7v ... Cover outer side Wall, 7g ... mating surface, 8 ... clutch chamber, 9 ... generator chamber, 10 ... crankshaft,
M: Transmission, 11: Continuously meshing gear transmission, 12 ... Main shaft, 13 ... Counter shaft, 15 ... Balancer shaft, 16 ... Output sprocket, 23 ... Primary drive gear, 24 ... Primary driven gear, 29 ... AC generator,
30 ... shift clutch, 31 ... clutch outer, 32 ... clutch inner, 35 ... pressure plate, 36 ... clutch spring, 37 ... lifter rod, 39 ... clutch camshaft (clutch release shaft),
50 ... speed change drive mechanism, 51 ... fork shaft, 52 ... shift drum, 53 ... shift fork, 54 ... change spindle, 54a ... shaft hole, 55 ... change pedal, 56 ... gear change mechanism, 57 ... master arm, 58 ... return Spring, 59 ... pin,
60 ... Retaining ring, 65 ... Closure member, 65a ... Shaft, 65b ... Flange,
80 ... transmission, 81 ... right crankcase, 82 ... right crankcase cover, 82B ... position regulating boss, 85 ... blocking member, 85a ... shaft, 85b ... flange,
90 ... transmission, 91 ... right crankcase, 92 ... right crankcase cover, 92B ... position regulating boss, 95 ... blocking member, 95a ... shaft, 95b ... flange, 95ba ... circular part, 95bb ... fan part, 95c ... concave portion.

Claims (5)

The shift drum (52) is rotated by the rotation operation of the change spindle (54), and the gear pair for transmitting the power of the transmission (11) is moved by the movement of the shift fork (53) guided by the shift drum (52). In a transmission for a saddle-ride type vehicle that changes and changes speed,
The shift drum (52) and the change spindle (54) parallel to each other are rotatable by a pair of opposing bearing walls (2Lv, 2Rv) of the transmission case (2) that houses the transmission (11). Bearing supported,
The change spindle (54) is formed with a shaft hole (54a) at the center of the shaft and having a shaft hole opening at at least one shaft end.
A case in which a shaft end portion having a shaft hole opening penetrating one bearing wall (2Lv, 2Rv) of the transmission case (2) of the change spindle (54) covers the side of the transmission case (2). Covered by a cover (7),
A shaft hole opening at one shaft end of the change spindle (54) is closed by a closing member (65),
A position restricting boss portion (7B) projecting perpendicularly from the inner surface of the case cover to the shaft end surface of the change spindle (54) abuts on the closing member (65) to move the change spindle (54) in the axial direction. A transmission for a saddle-ride type vehicle characterized in that   The blocking member (65) includes a shaft portion (65a) that is fitted into the shaft hole (54a) of the change spindle (54), and a flange portion that is formed to extend radially outward from the shaft end portion of the coaxial portion. The transmission for a saddle-ride type vehicle according to claim 1, characterized in that it comprises (65b). The change spindle (54) is made of ferrous metal,
The transmission of a saddle-ride type vehicle according to claim 2, wherein the closing member (65) is made of the same iron-based metal as the change spindle (54).   The saddle riding type vehicle according to claim 2 or 3, wherein the position restricting boss (7B) is formed coaxially with a rotation center axis (Lc) of the change spindle (54). Transmission device.   The transmission of a saddle-ride type vehicle according to any one of claims 2 to 4, wherein the closing member (65) has a plurality of types having different flange portions (65b).

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