TWI754885B - Straddled vehicle - Google Patents

Abstract

A first shaft includes a first threaded portion and is at least in part disposed inside a first accommodation portion. A second shaft is at least in part disposed inside a second accommodation portion, and is moved in an axis direction of a tensioner in accordance with rotation of the first shaft. The second shaft includes a second threaded portion and a distal end. The second threaded portion is screwed with the first threaded portion. The distal end protrudes from the second accommodation portion into an engine. A spring urges the first shaft to rotate the first shaft. As seen in a vehicle plan view, the tensioner at least in part overlaps with an intake pathway portion. The spring is disposed inside the first accommodation portion and the second accommodation portion.

Description

straddle vehicle

The present invention relates to a straddle-type vehicle.

There is a type of engine that is attached with a tensioner for pressing a timing chain or timing belt. For example, PCT International Application No. WO2003/048605 describes a tensioner including a rotating shaft, a thrust shaft, a housing, a spring and a bearing. The rotating shaft and the thrust shaft are screwed to each other via threads. The rotating shaft and the spring are arranged inside the casing. The spring pushes the rotary shaft to rotate the rotary shaft. Bearings are attached to the housing and limit the rotation of the thrust shaft. The rotating shaft is rotated by the urging force of the spring, so that the thrust shaft moves in its axial direction. Therefore, the thrust shaft presses on the timing chain or timing belt.

There is a type of straddle-type vehicle in which a tensioner is placed between the intake system and the engine. In order to fit the intake system and engine compactly in this type of vehicle, it is necessary to reduce the amount by which the tensioner protrudes from the engine.

In order to reduce the amount by which the tensioner protrudes from the engine, it can be assumed that the casing placed outside the engine is shortened. However, in this case, it is necessary to shorten the spring disposed inside the housing. This situation results in a reduction in the number of spring windings. In addition, when it is intended to apply a load equivalent to that of the initial spring that is not shortened, it is necessary to increase the outer diameter of the shortened spring. In this condition, the rate of change of the outer diameter of the spring increases with respect to the displacement of the thrust shaft. Considering the rate of change in the outer diameter of the spring, the radial size of the housing needs to be increased. Therefore, the engine size is increased.

In a straddle-type vehicle, the storage compartment and seat are placed above the engine. Therefore, an increase in the size of the engine results in a decrease in the capacity of the storage box. Instead, an increase in the size of the engine results in an increase in the seat height, so that it is inevitable that the rider's feet become difficult to touch the ground.

An object of the present invention is to provide a saddle-riding type vehicle that can suppress an increase in the size of the engine while making the amount of the tensioner protruding from the engine small. According to the present invention, this object is solved by a saddle-riding vehicle having the features of the independent claim 1 . The preferred embodiment is limited to subordinate claims.

A straddle-type vehicle according to an aspect includes a body frame, an engine, a storage box, a seat, an air intake path portion, and a tensioner. The engine is pivotably supported by the body frame. The storage box is placed above the engine. The seat is placed above the storage compartment. The air intake path is partially arranged under the storage box and connected to the engine. The tensioner is disposed between the intake path portion and the engine in the vehicle up-down direction, and is attached to the engine.

The tensioner includes a first accommodating part, a second accommodating part, a first shaft, a second shaft and a spring. The first receiving portion is positioned outside the engine and is attached to the engine. The second accommodating part is arranged inside the engine and is connected to the first accommodating part. The first shaft is disposed at least partially inside the first receiving portion and includes a first threaded portion. The second shaft is at least partially disposed inside the second accommodating portion, and moves in the axial direction of the tensioner according to the rotation of the first shaft. The second shaft includes a second threaded portion and a distal end. The second threaded portion is screwed together with the first threaded portion. The distal end protrudes into the engine from the second receiving portion. The spring pushes the first shaft to rotate the first shaft. The tensioner at least partially partially overlaps the intake path when viewed in a plan view of the vehicle. The spring is arranged inside the first accommodating part and the second accommodating part.

In the straddle-type vehicle according to the present aspect, the spring is disposed inside both the first receiving portion disposed outside the engine and the second receiving portion disposed inside the engine. Due to this, the amount of the tensioner protruding from the engine can be made smaller compared to a configuration in which the spring is completely housed inside the first accommodating portion, while a spring having a sufficient length can be reliably produced. Therefore, the amount by which the tensioner protrudes from the engine can be made small, while the increase in the size of the engine can be suppressed. In addition, since the amount by which the tensioner protrudes from the engine can be made small, the engine and the intake path portion can be arranged compactly. Therefore, the capacity reduction of the storage box can be suppressed. In addition, an increase in the seat height can be suppressed, thereby making it difficult for the rider's feet to touch the ground.

The second receiving portion may include a groove extending in the axial direction of the tensioner. The spring may include a locking portion that locks to the groove. The locking portion may extend in the groove in the axial direction of the tensioner. In this state, the rotation of the spring can be restricted more stably than when the locking portion of the spring extends in the circumferential direction of the spring. Due to this, spring durability can be enhanced.

The locking portion may protrude from the second receiving portion. The engine may include an attachment hole into which the second receiving portion is inserted. The attachment hole may include a first escape portion and a second escape portion. The locking portion may be positioned at the first retreat portion. The second escape portion may be disposed in a position rotationally displaced by a predetermined angle from the first escape portion around the center of the attachment hole. The second escape portion enables the locking portion to be seated therein. In this case, the interference between the locking portion and the attachment hole can be avoided by the first escape portion. In addition, the interference between the locking portion and the attachment hole can be avoided not only by the first escape portion but also by the second escape portion. Thanks to this, it is simple to attach the tensioner to the engine.

The locking portion may protrude from the second receiving portion. The engine may include attachment holes and first and second bolt holes for attaching the tensioner to the engine. The attachment hole may be a hole into which the second receiving portion is inserted. The attachment hole may include a retreat portion on which the locking portion is disposed. When viewed in the axial direction of the attachment hole, the escape portion may be disposed in a position that does not overlap with an imaginary straight line connecting the centers of the first and second bolt holes. In this case, the escape portion can be provided while the distance between the first and second bolt holes can be suppressed from increasing. Due to this, an increase in the engine size can be suppressed.

The first receiving portion may include a flange portion attached to the engine. The second receiving portion may be integrated with the flange portion. In this case, it becomes easy to form the first and second accommodating portions.

The first accommodating portion may be longer than the second accommodating portion in the axial direction of the tensioner. In this case, a spring with a larger length can be produced reliably.

An engine may include a crankcase, cylinders, and a head cover. The cylinder may include a first end and a second end. The first end is attachable to the head cover. The second end is attachable to the crankcase. The cylinder may include a tensioner attachment portion and an intake attachment portion. A tensioner is attachable to the tensioner attachment portion. The intake path portion may be attached to the intake attachment portion. The intake path portion may extend from the intake attachment portion toward the second end side. The intake air attachment portion may be disposed between the first end and the tensioner attachment portion in the axial direction of the cylinder. The distance between the first end and the tensioner attachment portion in the axial direction of the cylinder is greater than the distance between the tensioner attachment portion and the second end. In this case, the tensioner is positioned closer to the second end than to the first end side. Thus, the tensioner is positioned farther from the intake attachment portion toward the second end. Due to this, the tensioner can be placed away from the intake attachment portion. Therefore, easy access to the tensioner is made, so that the maintenance performance of the tensioner can be enhanced.

The straddle-type vehicle may further include an exhaust system connected to the engine. The exhaust system may include a catalyst positioned under the engine. In this case, the amount of the tensioner protruding from the engine can be made small, so that the engine and the intake path portion can be compactly arranged. Due to this, even when the catalyst is placed under the engine, an increase in the height of the vehicle or a decrease in the minimum height of the vehicle from the ground can be suppressed.

The intake path portion may include an intake conduit and a throttle body. The intake duct can be connected to the engine. The throttle body is connectable to the intake conduit. The tensioner may at least partially overlap the throttle body when viewed in a plan view of the vehicle. In this case, the amount of the tensioner protruding from the engine can be made smaller, so that the engine and the throttle valve body can be compactly arranged.

An engine may include a crankcase, a crankshaft, and cylinders. The crankshaft may be accommodated in the crankcase. The cylinder can be connected to the crankcase. The intake path portion may include an intake conduit. The intake duct can be connected to the cylinder and can be bent rearwardly from the cylinder. The axis of the cylinder may be offset downward from the center of rotation of the crankshaft when viewed in a side view of the vehicle. In this condition, the cylinder position can be lowered. Due to this, the intake path portion can be placed in a lower position, while a space can be reliably created above the cylinder to place the intake duct having a curved shape therein. Therefore, an increase in the engine size can be suppressed.

The saddle-riddled vehicle may further include a radiator and a cooling water path. The axis of the cylinder can form an angle greater than 45 degrees with respect to the horizontal direction. The cooling water path can be connected to the radiator and the engine. The tensioner may overlap the cooling water path when viewed in a direction perpendicular to the cylinder axis.

A straddle-type vehicle 1 according to a preferred embodiment will be explained below with reference to the drawings. FIG. 1 is a side view of a saddle-riding type vehicle 1 . The straddle-type vehicle 1 according to the presently preferred embodiment is a scooter-type vehicle. As shown in FIG. 1 , the straddle-type vehicle 1 includes a vehicle body frame 2 , a steering device 3 , a vehicle body cover 4 , front wheels 5 , seats 6 , rear wheels 7 , and a power unit 8 .

It should be noted that, in this specification, the front-rear direction, the up-down direction, and the left-right direction of the straddle-type vehicle 1 refer to the front-rear direction, the up-down direction, and the left-right direction as seen by a rider riding on the straddle-type vehicle 1 . In addition, the front-rear direction is defined as not only indicating a direction disposed parallel to the front-rear direction of the saddle-riding vehicle 1 , but also covering a direction inclined within an angular range of ±45 degrees with respect to the front-rear direction of the saddle-riding vehicle 1 . In other words, a given direction closer to the front-rear direction than the left-right direction and the up-down direction is classified as the front-rear direction.

Also, the up-down direction is defined to cover a direction inclined within an angular range of ±45 degrees with respect to the up-down direction of the saddle-riding vehicle 1 . In other words, a given direction closer to the up-down direction than the front-rear direction and the left-right direction is classified as the up-down direction. In addition, the left-right direction is defined to cover a direction inclined within an angular range of ±45 degrees with respect to the left-right direction of the saddle-riding type vehicle 1 . In other words, a given direction closer to the left-right direction than the front-rear direction and the up-down direction is classified as the left-right direction.

In this specification, the term "connection" is not limited to direct connection and covers indirect connection. In addition, the term "connected" is not limited to the case where separate parts are fixed to each other, and covers the case where a plurality of parts in an integral part are connected to each other.

The vehicle body frame 2 includes a head pipe 11 , a lower frame 12 , a lower frame 13 , and a rear frame 14 . The lower frame 12 extends downward from the head pipe 11 . The lower frame 13 is connected to the lower part of the lower frame 12 . The lower frame 13 extends rearward from the lower frame 12 . The rear frame 14 extends rearward and upward from the lower frame 13 .

The steering device 3 is rotatably supported by the head pipe 11 . The steering device 3 includes a steering shaft 21 , a lower bracket 22 and a front wheel fork 23 . The steering shaft 21 is inserted into the head pipe 11 . The steering shaft 21 is connected to the handle 25 at its upper portion. The steering shaft 21 is supported by the head pipe 11 and thus rotatable to the right and left. The lower bracket 22 is connected to the lower portion of the steering shaft 21 . The front fork 23 is connected to the lower bracket 22 at its upper end. The front wheel 5 is rotatably supported by the front wheel fork 23 .

The vehicle body cover 4 includes a front cover 32 , a rear cover 33 , a lower cover 34 , a leg shield 35 , and a mudguard 39 . The front cover 32 is positioned forward of the head pipe 11 . The leg shield 35 is positioned behind the front cover 32 . The leg shield 35 is arranged behind the head pipe 11 and the lower frame 12 . The mudguard 39 is arranged behind the front wheel 5 and in front of the leg shield 35 . The rear cover 33 covers the peripheral portion of the rear frame 14 . The rear cover 33 is placed under the seat 6 . The lower cover 34 is disposed between the front cover 32 and the rear cover 33 . The lower cover 34 covers the peripheral portion of the lower frame 13 .

The upper surface of the lower cover 34 includes a footrest 36 . The footrests 36 are arranged below and in front of the seat 6 . The footboard 36 is arranged behind the shin plate 35 . A footrest 36 is placed above the lower frame 13 . Footrests 36 are provided for allowing a rider to place his/her feet thereon. The footrest 36 has a completely flat shape in the vehicle width direction. However, the footrest 36 may not have a flat shape. For example, a central channel portion may be provided in the middle of the footrest 36 . The central channel portion has an upwardly protruding shape and extends in the front-rear direction.

The power unit 8 is arranged under the seat 6 . The power unit 8 includes an engine 26 and a transmission 27 . The power unit 8 is pivotably supported by the vehicle body frame 2 . The power unit 8 rotatably supports the rear wheel 7 . In other words, the power unit 8 including the engine 26 pivots together with the rear wheel 7 . Therefore, the saddle-riding type vehicle 1 includes a power unit 8 of the so-called unit swing type.

The rear wheel 7 is supported by the vehicle body frame 2 passing through the rear suspension 28 . The storage box 38 is positioned above the engine 26 . The seat 6 is placed above the storage box 38 . The seat 6 is placed above the rear frame 14 .

FIG. 2 is an enlarged left side view of the engine 26 and its surroundings. FIG. 3 is an enlarged plan view of the engine 26 and its surroundings. It should be noted that, in FIG. 3, the position of the storage box 38 is depicted by a double-dot chain line. As shown in FIGS. 2 and 3 , the engine 26 includes a crankcase 41 , cylinders 42 and a head cover 43 . The crankcase 41 is arranged on the side of the transmission 27 . The crankcase 41 houses the crankshaft 40 .

The cylinder 42 is arranged in front of the crankcase 41 . The cylinder 42 includes a cylinder body 42a and a cylinder head 42b. The cylinder body 42a is connected to the crankcase 41 . The cylinder head 42b is connected to the cylinder body 42a. The head cover 43 is placed in front of the cylinder 42 . The head cover 43 is attached to the cylinder head 42b. When viewed in a side view of the vehicle, the axis Ax1 of the cylinder 42 (hereinafter referred to as "cylinder axis Ax1") is inclined forward and upward. When viewed in a side view of the vehicle, the cylinder axis Ax1 is offset (displaced) downward from the rotation center C1 of the crankshaft 40 . The cylinder axis Ax1 forms an angle of less than 45 degrees with respect to the horizontal direction.

The straddle-type vehicle 1 includes the intake path portion 44 . The intake path portion 44 is connected to the engine 26 . The intake path portion 44 is positioned above the engine 26 . The intake path portion 44 at least partially overlaps the engine 26 when viewed in a plan view of the vehicle. The intake path portion 44 is positioned below the storage box 38 . The intake path portion 44 overlaps the storage box 38 when viewed in a vehicle plan view.

The intake path portion 44 includes an intake duct 45 , a throttle body 46 , an intake duct 47 and an air cleaner 48 . The intake duct 45 is connected to the engine 26 . In detail, the intake duct 45 is connected to the cylinder head 42b. The intake duct 45 is positioned above the cylinder 42 . The intake duct 45 at least partially overlaps the cylinder 42 when viewed in a plan view of the vehicle. The intake duct 45 is positioned below the storage box 38 . The intake duct 45 overlaps the storage box 38 when viewed in a plan view of the vehicle.

The intake duct 45 is connected to the upper surface 420 of the cylinder head 42b. The intake conduit 45 is shaped to bend rearward from the upper surface 420 of the cylinder head 42b. The throttle body 46 is connected to the intake duct 45 . The throttle body 46 is arranged behind the intake duct 45 . The throttle body 46 is positioned above the cylinder 42 . The throttle body 46 overlaps the cylinder 42 when viewed in a plan view of the vehicle. The throttle body 46 is positioned below the storage box 38 . The throttle body 46 overlaps the storage box 38 when viewed in a plan view of the vehicle.

The intake conduit 47 is connected to the throttle body 46 . The intake duct 47 is arranged behind the throttle body 46 . The intake duct 47 is placed above the crankcase 41 . The intake duct 47 overlaps the crankcase 41 when viewed in a plan view of the vehicle. The intake duct 47 may overlap the cylinder 42 when viewed in a plan view of the vehicle. The intake duct 47 is arranged below the storage box 38 . The intake duct 47 overlaps the storage box 38 when viewed in a plan view of the vehicle. The intake duct 47 extends rearward from the throttle body 46 .

The air cleaner 48 is connected to the intake duct 47 . The air cleaner 48 is arranged behind the intake duct 47 . The air cleaner 48 is placed above the power unit 8 . In detail, the air cleaner 48 is arranged above the transmission 27 . Air cleaner 48 is positioned above engine 26 .

FIG. 4 is an enlarged right side view of the power unit 8 and its surrounding parts. FIG. 5 is an enlarged bottom view of the power unit 8 and its surrounding parts. It should be noted that the description of the intake path portion 44 is omitted in FIGS. 4 and 5 . As shown in FIGS. 4 and 5 , the straddle-type vehicle 1 includes an exhaust system 51 . Exhaust system 51 is connected to engine 26 . The exhaust system 51 includes a first exhaust duct 52 , a catalyst 53 , a second exhaust duct 54 and a muffler 55 .

The first exhaust pipe 52 is connected to the cylinder head 42b. The first exhaust conduit 52 is positioned at least partially below the cylinder 42 . The first exhaust conduit 52 at least partially overlaps the cylinder 42 when viewed in a plan view of the vehicle. The first exhaust duct 52 is positioned at least partially below the crankcase 41 . The first exhaust duct 52 at least partially overlaps the crankcase 41 when viewed in a plan view of the vehicle. The first exhaust duct 52 extends rearward from the cylinder head 42b.

The catalyst 53 is connected to the first exhaust pipe 52 . The diameter of the catalyst 53 is thicker than that of the first exhaust duct 52 . The diameter of the catalyst 53 is thicker than that of the second exhaust duct 54 . The catalyst 53 purifies the exhaust gases transferred thereto from the engine 26 . The catalyst 53 is disposed at least partially below the engine 26 . In detail, the catalyst 53 is disposed at least partially below the crankcase 41 . The catalyst 53 at least partially overlaps the crankcase 41 when viewed in a vehicle plan view. The second exhaust pipe 54 is connected to the catalyst 53 . The muffler 55 is connected to the second exhaust duct 54 .

As shown in FIGS. 2 and 3 , the saddle-ridden vehicle 1 includes a tensioner 60 . A tensioner 60 is attached to the engine 26 . In detail, the tensioner 60 is attached to the cylinder body 42a. The tensioner 60 is disposed between the intake path portion 44 and the engine 26 in the vehicle up-down direction. The tensioner 60 is attached to the upper surface 420 of the cylinder 42 . The tensioner 60 is positioned below the intake path portion 44 . The tensioner 60 at least partially overlaps the intake path portion 44 when viewed in a plan view of the vehicle. In detail, the tensioner 60 at least partially overlaps the throttle body 46 when viewed in a vehicle plan view. However, the tensioner 60 may at least partially overlap the intake duct 45 when viewed in a plan view of the vehicle. The tensioner 60 may at least partially overlap the intake duct 47 when viewed in a plan view of the vehicle.

FIG. 6 is a perspective view of the tensioner 60 . FIG. 7 is an exploded perspective view of the tensioner 60 . FIG. 8 is a cross-sectional view of the tensioner 60 . FIG. 9 is a cross-sectional view of a portion of engine 26 . As shown in FIGS. 6 to 9 , the tensioner 60 includes a first accommodating part 61 , a second accommodating part 62 , a first shaft 63 , a second shaft 64 and a spring 65 .

As shown in FIG. 9 , the first accommodating portion 61 is disposed outside the engine 26 . The first receiving portion 61 is attached to the upper surface 420 of the cylinder 42 . As shown in FIG. 8 , the length of the first accommodating portion 61 in the direction of the axis Ax2 of the tensioner 60 is greater than that of the second accommodating portion 62 . In other words, the first accommodating portion 61 is longer than the second accommodating portion 62 in the axial direction (Ax2) of the tensioner 60 . The first accommodating portion 61 includes a accommodating body 66 and a flange portion 67 . The accommodating body 66 has a cylindrical shape. The containment body 66 includes an uppermost portion 68 . The uppermost portion 68 is provided with an opening 680 . The opening 680 is opposite to the first shaft 63 in the axial direction (Ax2) of the tensioner 60 . The top cover 77 is attached to the opening 680 .

The flange portion 67 protrudes radially outward from the accommodating body 66 . The flange portion 67 is attached to the upper surface 420 of the cylinder 42 . As shown in FIG. 7 , the flange portion 67 includes a plurality of attachment holes 671 and 672 . In detail, the plurality of attachment holes 671 and 672 include a first attachment hole 671 and a second attachment hole 672 . The first attachment hole 671 and the second attachment hole 672 are arranged symmetrically to each other with respect to the axis Ax2 of the tensioner 60 . It should be noted that the number of attachment holes is not limited to two, and may alternatively be greater than two. The first attachment hole 671 and the second attachment hole 672 may not be arranged symmetrically with each other with respect to the axis Ax2 of the tensioner 60 .

The second accommodating portion 62 is disposed inside the engine 26 . The second accommodating portion 62 has a cylindrical shape. The second receiving portion 62 is connected to the flange portion 67 . The second accommodating portion 62 extends from the flange portion 67 in the axial direction (Ax2) of the tensioner 60 . The second accommodating part 62 is integrated with the first accommodating part 61 . The second receiving portion 62 is integrated with the flange portion 67 . However, the second accommodating part 62 may be separated from the first accommodating part 61 . The second receiving portion 62 is open at its distal end.

The first shaft 63 extends in the axial direction (Ax2 ) of the tensioner 60 . As shown in FIG. 8 , the first shaft 63 is disposed inside both the first accommodating portion 61 and the second accommodating portion 62 . The first shaft 63 includes a first base end 631 and a first distal end 632 . The first base end 631 includes a groove 633 extending in the radial direction of the first shaft 63 . The groove 633 is opposite to the opening 680 of the uppermost portion 68 of the first accommodating portion 61 in the axial direction (Ax2) of the tensioner 60 . The first distal end 632 is disposed on the opposite side of the first base end 631 .

The tensioner 60 includes a first support member 69 . The first support member 69 is disposed inside the first accommodating portion 61 . The first support member 69 rotatably supports the first shaft 63 . The first support member 69 is disposed between the first base end 631 of the first shaft 63 and the uppermost portion 68 of the first receiving portion 61 . The first support member 69 supports the first shaft 63 at the first base end 631 . The first support member 69 includes an opening 690 . The opening 690 of the first support member 69 is opposite to the opening 680 of the uppermost portion 68 of the first accommodating portion 61 in the axial direction (Ax2) of the tensioner 60 .

The first shaft 63 includes a first threaded portion 634 . The first threaded portion 634 is provided on the outer peripheral surface of the first shaft 63 . The first threaded portion 634 is provided on the first shaft 63 in a predetermined range starting from the first distal end 632 in the axis direction (Ax2). The first shaft 63 includes a head end portion 71 and a shaft body 72 . The head end portion 71 includes the first base end 631 and the groove 633 described above. The outer diameter of the head end portion 71 is larger than the outer diameter of the shaft body 72 . The shaft 72 includes the first distal end 632 and the first threaded portion 634 described above.

The second shaft 64 extends in the axial direction ( Ax2 ) of the tensioner 60 . The second shaft 64 is partially disposed inside the second receiving portion 62 . The second shaft 64 is partially disposed outside both the first accommodating portion 61 and the second accommodating portion 62 . The second shaft 64 includes a second base end 641 and a second distal end 642 . The second base end 641 is disposed inside the second receiving portion 62 . However, the second base end 641 may be positioned inside the first receiving portion 61 . The second shaft 64 has a hollow tubular shape. The second shaft 64 is open at the second base end 641 .

The second shaft 64 includes a second threaded portion 643 . The second threaded portion 643 is provided on the inner peripheral surface of the second shaft 64 . The second threaded portion 643 is provided on the second shaft 64 with a predetermined range starting from the second base end 641 in the axial direction (Ax2). The second threaded portion 643 is screwed together with the first threaded portion 634 . The second distal end 642 is disposed on the opposite side of the second base end 641 . The second distal end 642 protrudes from the second receiving portion 62 into the engine 26 . Cap 73 is attached to second distal end 642 .

The tensioner 60 includes a second support member 74 . The second support member 74 is attached to the second receiving portion 62 . The second support member 74 non-rotatably supports the second shaft 64 . The second support member 74 movably supports the second shaft 64 in the axial direction (Ax2). In detail, as shown in FIG. 7 , the second support member 74 includes a support body 740 and attachment portions 741 to 743 . The support body 740 has a contour suitable for the inner peripheral surface of the second accommodating portion 62 and is disposed inside the second accommodating portion 62 . The attachment parts 741 to 743 are attached to the second accommodation part 62 . The attachment portions 741 to 743 are made in the shape of a plurality of protrusions protruding radially outward from the support body 740 .

The second accommodating portion 62 includes a plurality of cutouts 621 to 623 . Cutouts 621 to 623 corresponding to the attachment portions 741 to 743, respectively, are provided. The cutouts 621 to 623 are shaped to be recessed from the distal end of the second receiving portion 62 in the axial direction (Ax2). The attachment portions 741 to 743 are locked to the cutouts 621 to 623, thereby restricting the rotation of the second support member 74 about the axis Ax2. In addition, the second receiving portion 62 is provided with an attachment groove 624 . The attachment grooves 624 extend circumferentially on the outer peripheral surface of the second receiving portion 62 . The clip 75 is attached to the attachment groove 624, thereby preventing the second support member 74 from being disengaged from the second receiving portion 62 in the axial direction (Ax2). It should be noted that, in the presently preferred embodiment, the second support member 74 is provided with three attachment portions 741 to 743 . However, the number of attachment portions is not limited to three, and may instead be smaller or larger than three.

The support body 740 includes an opening 744 . The opening 744 is penetrated by the second shaft 64 . Opening 744 has a non-circular shape. In detail, the edge of the opening 744 includes locking portions 745 and 746 . The second shaft 64 includes locked portions 644 and 645 on its outer peripheral surface. The locking portions 745 and 746 of the support body 740 are locked to the locked portions 644 and 645 of the second shaft 64, thereby restricting the rotation of the second shaft 64 about the axis Ax2. In detail, the locking portions 745 and 746 each have a vertical shape. The locked portions 644 and 645 each have a flat shape. However, the shapes of locking portions 745 and 746 and locked portions 644 and 645 may differ from those described above. Additionally, in the presently preferred embodiment, two pairs of locking portions 745, 746 and locked portions 644, 645 are provided. However, the number of pairs of locking portions and locked portions is not limited to two pairs, and alternatively, may be one pair or may be three or more pairs.

As shown in FIG. 8 , the tensioner 60 includes a spacer 76 . The spacer 76 is disposed between the head end portion 71 of the first shaft 63 and the second support member 74 in the axial direction (Ax2). The spacer 76 has a hollow tubular shape. The shaft body 72 of the first shaft 63 is arranged inside the spacer 76 . The spacer 76 includes a first support portion 761 and a second support portion 762 . The first support portion 761 is provided on one end of the spacer 76 . The second support portion 762 is disposed on the other end of the spacer 76 .

The first support portion 761 includes a hole 763 . The hole 763 is penetrated by the shaft body 72 . The inner diameter of the hole 763 is smaller than the outer diameter of the head end portion 71 . Due to this, the first support portion 761 contacts the head end portion 71, thereby restricting the movement of the first shaft 63 toward the second support member 74 in the axial direction (Ax2). The second support portion 762 extends outward in the circumferential direction. The second support portion 762 is opposed to the second support member 74 in the axial direction (Ax2). When the second support portion 762 contacts the second support member 74, the spacer 76 is restricted from moving toward the second support member 74 in the axial direction (Ax2).

The spring 65 is disposed inside both the first accommodating portion 61 and the second accommodating portion 62 . The spring 65 pushes the first shaft 63 to rotate the first shaft 63 . In the presently preferred embodiment, the spring 65 is a coil spring. The shaft body 72 of the first shaft 63 is at least partially arranged inside the spring 65 . The spacer 76 is positioned at least partially inside the spring 65 . As shown in FIG. 8 , the spring 65 includes a coil portion 651 , a first locking portion 652 and a second locking portion 653 . The first locking portion 652 is provided on one end of the spring 65 . The second locking portion 653 is provided on the other end of the spring 65 . The first locking portion 652 protrudes radially inward from the coil portion 651 . The first locking portion 652 is seated in the groove 633 of the first shaft 63 . The first locking portion 652 is locked to the first shaft 63 at the groove 633 . The urging force of the spring 65 is transmitted to the first shaft 63 via the first locking portion 652 .

The second locking portion 653 protrudes radially outward from the coil portion 651 . The second receiving portion 62 includes a locking groove 625 . The locking groove 625 extends in the axial direction (Ax2 ) in the second accommodating portion 62 . The second locking portion 653 is seated in the locking groove 625 . The second locking portion 653 extends in the axial direction (Ax2) within the locking groove 625 . As shown in FIG. 6 , the second locking portion 653 protrudes from the second accommodating portion 62 to the outside of the second accommodating portion 62 . The second locking portion 653 is locked to the second receiving portion 62 at the locking groove 625 . Therefore, the restricting spring 65 rotates about the axis Ax2.

It should be noted that the locking groove 625 extends from the distal end of the second accommodating portion 62 to the first accommodating portion 61 in the axial direction (Ax2). In detail, the locking groove 625 partially extends to the receiving body 66 through the flange portion 67 . The distal end of the second locking portion 653 is locked to the locking groove 625 in the flange portion 67 . It should be noted that the extent to which locking grooves 625 are provided may vary.

In the tensioner 60 according to the presently preferred embodiment, the urging force rotating about the axis Ax2 is applied to the first shaft 63 by the spring 65 . The first threaded portion 634 of the first shaft 63 and the second threaded portion 643 of the second shaft 64 are screwed together. In addition, the second shaft 64 is supported by the second support member 74 while being movable in the axis direction (Ax2) but not rotatable about the axis Ax2. Therefore, when the first shaft 63 rotates, the second shaft 64 moves in the axial direction (Ax2). As shown in FIG. 9 , the second shaft 64 presses a transmission member 57 , such as a timing chain or a timing belt, via a pressing member 56 disposed inside the engine 26 . Therefore, the tensioner 60 is caused to apply a predetermined amount of tension to the transmission member 57 .

In addition, it is possible to lock the clamp to the groove 633 of the first shaft 63 by inserting the clamp into the opening 680 of the first receiving portion 61 . Therefore, when the first shaft 63 is rotated by the clamp, it is possible to adjust the magnitude of the pressing force to be applied to the transmission member 57 by the tensioner 60 .

Next, the structure for attaching the tensioner 60 to the engine 26 will be explained. As shown in FIG. 2 , the cylinder 42 includes a first end 421 and a second end 422 . The first end 421 is attached to the head cover 43 . The second end 422 is attached to the crankcase 41 . The cylinder 42 includes a tensioner attachment portion 49 and an intake air attachment portion 50 . The tensioner attachment portion 49 and the intake air attachment portion 50 are provided on the upper surface 420 of the cylinder 42 . The tensioner attachment portion 49 is positioned behind the intake attachment portion 50 . The tensioner 60 is attached to the tensioner attachment portion 49 . The intake path portion 44 is attached to the intake attachment portion 50 . In detail, the intake duct 45 is attached to the intake attachment portion 50 .

The intake path portion 44 extends from the intake attachment portion 50 toward the second end 422 side. In other words, the intake path portion 44 extends rearward from the intake attachment portion 50 . The intake air attachment portion 50 is disposed between the first end 421 and the tensioner attachment portion 49 in the cylinder axis direction (Ax1). The distance L1 between the first end 421 and the tensioner attachment portion 49 is greater than the distance L2 between the tensioner attachment portion 49 and the second end 422 in the cylinder axis direction (Ax1). It should be noted that the position of the tensioner attachment portion 49 is defined herein to mean the position of the center of the attachment hole 80 (to be described) of the tensioner attachment portion 49 .

FIG. 10 is an enlarged view showing a portion of the upper surface 420 of the cylinder 42 of the engine 26 . In FIG. 10 , the position of the tensioner 60 is depicted by a two-dot chain line. As shown in FIG. 10 , the tensioner attachment portion 49 includes an attachment hole 80 , a first bolt hole 81 and a second bolt hole 82 . The second receiving portion 62 is inserted into the attachment hole 80 . The first bolt hole 81 and the second bolt hole 82 are provided to correspond to the first attachment hole 671 and the second attachment hole 672 of the flange portion 67 , respectively. The first bolt hole 81 and the first attachment hole 671 are penetrated by one of the bolts 83 and 84 shown in FIG. The other penetrates. Therefore, the flange portion 67 of the tensioner 60 is fixed to the cylinder 42 .

The attachment hole 80 has a non-circular shape. In detail, when viewed in the direction of the axis Ax3 of the attachment hole 80, the attachment hole 80 is shaped to be longer than the direction of the virtual straight line V1 in the direction perpendicular to the virtual straight line V1. The virtual straight line V1 is a straight line connecting the center C1 of the first bolt hole 81 and the center C2 of the second bolt hole 82 when viewed in the axial direction (Ax3) of the attachment hole 80 . It should be noted that the position of the axis Ax3 of the attachment hole 80 means the position of the axis Ax2 of the tensioner 60 . The attachment hole 80 includes a first escape portion 801 and a second escape portion 802 .

The second escape portion 802 is disposed in a position rotationally displaced from the first escape portion 801 by a predetermined angle around the axis Ax3 of the attachment hole 80 . In the presently preferred embodiment, the predetermined angle is 180 degrees. However, the predetermined angle may be different from 180 degrees. The second escape portion 802 is disposed symmetrically with the first escape portion 801 with respect to the axis Ax3 of the attachment hole 80 . When viewed in the axial direction (Ax3) of the attachment hole 80, the first escape portion 801 and the second escape portion 802 are disposed in positions that do not overlap with the virtual straight line V1.

When viewed in the axial direction (Ax3) of the attachment hole 80, the distance L3 from the axis Ax3 of the attachment hole 80 to the first escape portion 801 is greater than the distance L3 from the axis Ax3 of the attachment hole 80 to the attachment on the virtual straight line V1 Distances L4 and L5 between the edges of the contact holes 80 . When viewed in the axis direction (Ax3) of the attachment hole 80, the distance L6 from the axis Ax3 of the attachment hole 80 to the second escape portion 802 is greater than the distance L6 from the axis Ax3 of the attachment hole 80 to the attachment on the virtual straight line V1 Distances L4 and L5 between the edges of the contact holes 80 . When viewed in the axis direction (Ax3) of the attachment hole 80, the distances L4, L5 from the axis Ax3 of the attachment hole 80 to the edge of the attachment hole 80 on the virtual straight line V1 are smaller than the axis from the attachment hole 80 A distance L7 from Ax3 to the distal end of the second locking portion 653 of the spring 65 .

The distance L3 from the axis Ax3 of the attachment hole 80 to the first escape portion 801 is greater than the distance L3 from the axis Ax3 of the attachment hole 80 to the second locking portion of the spring 65 when viewed in the axial direction (Ax3) of the attachment hole 80 The distance L7 from the far end of 653. When viewed in the axis direction (Ax3) of the attachment hole 80, the distance L6 from the axis Ax3 of the attachment hole 80 to the second escape portion 802 is greater than from the axis Ax3 of the attachment hole 80 to the second locking portion of the spring 65 The distance L7 from the far end of 653. Therefore, each of the first escape portion 801 and the second escape portion 802 enables the second locking portion 653 of the spring 65 to be seated therein. Due to this, when the tensioner 60 is attached to the engine 26 , the second locking portion 653 of the spring 65 is enabled to be seated in either of the first escape portion 801 and the second escape portion 802 .

In the saddle-riding type vehicle 1 according to the presently preferred embodiment described above, the spring 65 of the tensioner 60 is placed in the first accommodating portion 61 placed outside the engine 26 and the second accommodating portion 61 placed inside the engine 26 62 both inside. Due to this, the amount of the tensioner 60 protruding from the engine 26 can be made smaller compared to a configuration in which the spring 65 is completely housed inside the first accommodating portion 61, while the spring 65 having a sufficient length can be reliably produced. Therefore, the amount by which the tensioner 60 protrudes from the engine 26 can be made small, while the increase in the size of the engine 26 can be suppressed. In addition, since the amount by which the tensioner 60 protrudes from the engine 26 can be made small, the engine 26 and the intake path portion 44 can be arranged compactly. Therefore, the capacity reduction of the storage box 38 can be suppressed. In addition, the height of the seat 6 can be suppressed from increasing, so that the rider's feet can be suppressed from becoming difficult to touch the ground.

In the tensioner 60 , the second locking portion 653 of the spring 65 extends in the axial direction (Ax2 ) of the tensioner 60 within the locking groove 625 of the second receiving portion 62 . Therefore, compared to when the second locking portion 653 of the spring 65 extends in the circumferential direction of the spring 65, the rotation of the spring 65 can be restrained more stably herein. Due to this, the durability of the spring 65 can be enhanced.

The attachment hole 80 of the tensioner attachment portion 49 includes a first escape portion 801 and a second escape portion 802 . Therefore, the interference between the second locking portion 653 and the attachment hole 80 can be avoided by the first escape portion 801 . In addition, the interference between the second locking portion 653 and the attachment hole 80 can be avoided not only by the first escape portion 801 but also by the second escape portion 802 . Due to this, it is easy to attach the tensioner 60 to the engine 26 .

When viewed in the axial direction (Ax3) of the attachment hole 80, the first escape portion 801 and the second escape portion 802 are disposed in positions that do not overlap with the virtual straight line V1. Therefore, the first escape portion 801 and the second escape portion 802 can be provided, while the distance between the first bolt hole 81 and the second bolt hole 82 can be suppressed from increasing. Due to this, an increase in the size of the engine 26 can be suppressed.

The second accommodating portion 62 is integrated with the flange portion 67 of the first accommodating portion 61 . Due to this, the first accommodating portion 61 and the second accommodating portion 62 are easily formed.

The first accommodating portion 61 is longer than the second accommodating portion 62 in the axial direction (Ax2) of the tensioner 60 . Due to this, the spring 65 with a larger length can be produced reliably.

The distance L1 between the first end 421 and the tensioner attachment portion 49 is greater than the distance L2 between the tensioner attachment portion 49 and the second end 422 in the axial direction (Ax1) of the cylinder 42 . Therefore, the tensioner 60 is arranged to be spaced apart from the intake air attachment portion 50 toward the second end 422 side. Due to this, the tensioner 60 may be placed away from the intake attachment portion 50 . Therefore, easy access to the tensioner 60 is made, so that the maintenance performance of the tensioner 60 can be enhanced.

As described above, the amount by which the tensioner 60 protrudes from the engine 26 can be made small, so that the engine 26 and the intake path portion 44 can be compactly accommodated. Therefore, even when the catalyst 53 is disposed under the engine 26, the height increase of the saddle-riding type vehicle 1 or the decrease in the minimum height of the saddle-riding type vehicle 1 from the ground can be suppressed.

The cylinder axis Ax1 of the engine 26 is offset (displaced) downward from the rotation center C1 of the crankshaft 40 . Due to this, the position of the cylinder 42 can be lowered. Therefore, the intake path portion 44 can be placed in a lower position, while a space can be reliably created above the cylinder 42 for placing the intake duct 45 having a curved shape therein. Therefore, an increase in the size of the engine 26 can be suppressed.

A preferred embodiment according to the present teaching has been explained above. However, the present teachings are not limited to the foregoing preferred embodiments, and various changes may be made without departing from the present teachings.

The straddle-type vehicle 1 is not limited to a scooter-type vehicle, and may alternatively be another type of vehicle. The number of front wheels is not limited to one, and alternatively, may be two or more. Besides, the number of rear wheels is not limited to one, and alternatively, may be two or more.

The structure of the vehicle body frame 2 is not limited to the structure of the aforementioned preferred embodiment, and can be changed. For example, the shape or layout of the head pipe 11 , the lower frame 12 , the lower frame 13 or the rear frame 14 may be changed.

The structures and/or layouts of the engine 26, the intake path portion 44 and the exhaust system 51 may vary and are not limited to those of the aforementioned preferred embodiments. For example, the structure and/or layout of the intake attachment portion 50 may be changed. The structure and/or layout of the tensioner attachment portion 49 may be varied. The shape of the attachment hole 80 can be changed. Either or both of the first backoff portion 801 and the second backoff portion 802 may be omitted. The shape of the catalyst 53 can be changed. Alternatively, catalyst 53 may be omitted.

The cylinder axis Ax1 may form an angle of 45 degrees or more with respect to the horizontal direction. For example, FIG. 11 is an enlarged left side view of the engine 26 and its surroundings according to the modification. FIG. 12 is an enlarged plan view of the engine 26 and its surroundings according to the modification. As shown in FIG. 11 , the cylinder axis Ax1 may form an angle greater than 45 degrees with respect to the horizontal direction. As shown in FIGS. 11 and 12 , the saddle-ridden vehicle 1 according to the modification includes a radiator 91 , a cooling water path 92 , and a water pump 93 .

As shown in FIG. 12 , the radiator 91 is positioned in front of the engine 26 when viewed in a plan view of the vehicle. The water pump 93 is connected to the cylinder head 42b. The cooling water path 92 is connected to the engine 26 and the radiator 91 . The cooling water path 92 is arranged to pass behind the cylinder head 42b. The tensioner 60 overlaps the cooling water path 92 when viewed in a direction perpendicular to the cylinder axis Ax1. As shown in FIG. 11 , the extension of the axis Ax2 of the tensioner 60 overlaps the cooling water path 92 when viewed in a side view of the vehicle. As shown in FIG. 12 , the extension of the axis Ax2 of the tensioner 60 overlaps the cooling water path 92 when viewed in a top view of the vehicle.

The structure and/or layout of the tensioner 60 may be changed, and is not limited to those/their structures and/or layouts of the aforementioned preferred embodiments. For example, the tensioner 60 may completely overlap the intake path portion 44 when viewed in a plan view of the vehicle. The structures and/or layouts of the first accommodating portion 61 , the second accommodating portion 62 , the first shaft 63 , the second shaft 64 and/or the spring 65 can be changed.

1: Straddle vehicle 2: body frame 3: Steering device 4: Body cover 5: Front wheel 6: Seat 7: Rear wheel 8: Power unit 11: Head tube 12: Lower frame 13: Lower frame 14: Rear frame 21: Steering shaft 22: Lower bracket 23: Front Wheel Fork 25: Handle 26: Engine 27: Transmission 28: Rear Suspension 32: Front cover 33: Rear cover 34: Lower cover 35: Leggings 36: Foot pedal 38: Storage Box 39: Mudguard 40: Crankshaft 41: Crankcase 42: Cylinder 42a: Cylinder body 42b: Cylinder head 43: head cover 44: Intake path part 45: Intake duct 46: Throttle valve body 47: Intake duct 48: Air Purifier 49: Tensioner attachment part 50: Intake attachment part 51: Exhaust system 52: First exhaust pipe 53: Catalyst 54: Second exhaust pipe 55: Muffler 56: Press parts 57: Transmission parts 60: Tensioner 61: The first accommodation part 62: Second accommodation part 63: The first axis 64: Second axis 65: Spring 66: accommodating the body 67: Flange part 68: Top part 69: The first support part 71: Head end part 72: Shaft 73: Top cover 74: Second support part 75: Clip 76: Spacer 77: Top cover 80: Attachment hole 81: The first bolt hole 82: Second bolt hole 83: Bolts 84: Bolts 91: Radiator 92: cooling water path 93: Water Pump 420: Upper surface 421: First End 422: Second End 621: Cut 622: Cut 623: Cut 624: Groove 625: Locking groove 631: First base end 632: First remote 633: Groove 634: First thread part 641: Second base end 642: second remote 643: Second thread part 644: locked part 645: locked part 651: Coil part 652: First Lock Part 653: Second Lock Part 671: First attachment hole 672: Second attachment hole 680: Opening 690: Opening 740: Support body 741: Attachment part 742: Attachment part 743: Attachment part 744: Opening 745: Locked Parts 746: Locked Parts 761: First support part 762: First support part 763: Hole 801: First Backoff Part 802: Second Backoff Section Ax1: Cylinder axis direction Ax2: Tensioner axis direction Ax3: Attachment hole axis direction L1: Distance L2: Distance L3: Distance L4: Distance L5: Distance L6: Distance L7: Distance C1: Center C2: Center V1: virtual straight line

1 is a side view of a saddle-riding vehicle according to a preferred embodiment.

Figure 2 is an enlarged left side view of the engine and its surrounding parts.

FIG. 3 is an enlarged plan view of the engine and its surrounding parts.

FIG. 4 is an enlarged right side view of the power unit and its surrounding parts.

Fig. 5 is an enlarged bottom view of the power unit and its surrounding parts.

Figure 6 is a perspective view of the tensioner.

Figure 7 is an exploded perspective view of the tensioner.

Figure 8 is a cross-sectional view of the tensioner.

Figure 9 is a cross-sectional view of a portion of the engine.

FIG. 10 is an enlarged view of a portion of the upper surface of the engine cylinder.

FIG. 11 is an enlarged left side view of the engine and its surrounding parts according to the modification.

FIG. 12 is an enlarged plan view of the engine and its surrounding parts according to the modification.

60: Tensioner

61: The first accommodation part

62: Second accommodation part

63: The first axis

64: Second axis

65: Spring

66: accommodating the body

67: Flange part

68: Top part

69: The first support part

71: Head end part

72: Shaft

73: Top cover

74: Second support part

75: Clip

76: Spacer

77: Top cover

624: Groove

625: Locking groove

631: First base end

632: First remote

633: Groove

634: First thread part

641: Second base end

642: second remote

643: Second thread part

651: Coil part

652: First Lock Part

653: Second Lock Part

680: Opening

690: Opening

761: First support part

762: First support part

763: Hole

Ax2: Tensioner axis direction

Claims (8)

A straddle-type vehicle comprising: a body frame (2); an engine (26) pivotally supported by the body frame (2); a storage box (38) in a A seat (6) placed above the storage box (38) in the vertical direction of the vehicle; an air intake path portion (44) above the engine (26) in the vertical direction of the vehicle The vehicle up-down direction is arranged below the storage box (38), the intake path portion (44) is connected to the engine (26); and a tensioner (60) is arranged in the vehicle up-down direction under the intake Between the air path portion (44) and the engine (26), the tensioner (60) is attached to the engine (26), wherein the tensioner (60) includes a first receiving portion (61) disposed in Outside the engine (26), the first receiving part (61) is attached to the engine (26), a second receiving part (62) is placed inside the engine (26), the second receiving part (62) ) connected to the first accommodating portion (61), a first shaft (63) at least partially disposed inside the first accommodating portion (61), the first shaft (63) comprising a first threaded portion ( 634), a second shaft (64), which is at least partially disposed inside the second receiving portion (62), the second shaft (64) in the tensioner (60) according to the rotation of the first shaft (63) ) moving in an axial direction (Ax2), the second shaft (64) includes a second threaded portion (643) and a distal end (642), the second threaded portion (643) and the first threaded portion ( 634) screwed together, the distal end (642) protruding from the second receiving portion (62) into the engine (26), and A spring (65) urging the first shaft (63) to rotate the first shaft (63), the tensioner (60) at least partially aligned with the intake path portion (44) when viewed in a plan view of the vehicle ) overlap, and the spring (65) is arranged inside the first accommodating part (61) and the second accommodating part (62); and the second accommodating part (62) is included in the axis of the tensioner (60) A groove (625) extending in the direction (Ax2), the spring (65) including a locking portion (653) locked to the groove (625), and the locking portion (653) in the groove (625) The inner extends in the axial direction (Ax2) of the tensioner (60); and the locking portion (653) protrudes from the second accommodating portion (62) and protrudes from the tensioner (60), the engine (26) Including an attachment hole (80) into which the second receiving portion (62) is inserted, and first and second bolt holes (81, 82) for attaching the tensioner (60) Connected to the engine (26), the attachment hole (80) includes a retreat portion (801) where the locking portion (653) is disposed, and the retreat portion (801) is equivalent to one of the attachment holes (80) When viewed in the axial direction (Ax3), it is placed in a position that does not overlap with a virtual straight line (V1) connecting the centers (C1, C2) of the first and second bolt holes (81, 82). The straddle-type vehicle of claim 1, wherein the first receiving portion (61) includes a flange portion (67) attached to the engine (26), and The second receiving portion (62) is integrated with the flange portion (67). The saddle-riding vehicle of claim 1, wherein the first accommodating portion (61) is longer than the second accommodating portion (62) in the axial direction (Ax2) of the tensioner (60). The straddle-type vehicle of claim 1, further comprising: an exhaust system (51) connected to the engine (26), wherein the exhaust system (51) includes an exhaust system (51) disposed below the engine (26) Catalyst (53). The straddle-type vehicle of claim 1, wherein the intake path portion (44) includes an intake duct (45) connected to the engine (26), and a throttle body (46) connected to the engine (26) an intake duct (45), and the tensioner (60) at least partially overlaps the throttle body (46) when viewed in plan view of the vehicle. The straddle-type vehicle of claim 1, wherein the engine (26) includes a crankcase (41) and a cylinder (42) connected to the crankcase (41). The saddle-riding vehicle of claim 6, wherein the cylinder (42) includes a first end (421) attached to the head cover (43), and a second end (421) attached to the crankcase (41). 422), the cylinder (42) includes A tensioner attachment portion (49) to which the tensioner (60) is attached, and an air intake attachment portion (50) to which the air intake path portion (44) is attached An air attachment portion, the intake path portion (44) extending from the intake attachment portion (50) toward the second end (422) side, the intake attachment portion (50) being between the cylinder (42) An axis direction (Ax1) is disposed between the first end (421) and the tensioner attachment portion (49), and the first end (421) and the tensioner attachment portion (49) A distance (L1) in the axial direction (Ax1) of the cylinder (42) is greater than a distance (L2) between the tensioner attachment portion (49) and the second end (422). The straddle-type vehicle of claim 6, wherein the engine (26) includes a crankshaft (40) accommodated in the crankcase (41), and the intake path portion (44) includes an intake duct (45) , the intake duct (45) is connected to the cylinder (42), the intake duct (45) is bent backward from the cylinder (42) in a vehicle front-rear direction, and an axis of the cylinder (42) is equal to the vehicle It is offset downward from one of the rotation centers (C1) of the crankshaft (40) when viewed in side view.

Images