CN107662690B - Pedal starting device of power unit for saddle-ride type vehicle - Google Patents

Abstract

A kick-start device of a power unit for a saddle-ride type vehicle, which can support a power transmission member with proper friction by a spring member even if the structure is provided with the spring member on an air guide path. The kick starter is characterized in that a kick starter mechanism (61) is supported on a transmission case cover (56), and the kick starter mechanism comprises: a power transmission member (92) having a power transmission gear (103) provided on a power transmission shaft (93) and transmitting power to the crankshaft (23); and a spring member (94) attached to a sliding portion (104) formed in the power transmission member, the spring member being attached to the sliding portion so as to sandwich the sliding portion between the sandwiching portions, at least the sliding portion in the kick start mechanism being provided in an air guide path (88) for cooling air sucked from a cooling air suction port (85), wherein a protective wall is provided on the transmission case cover so as to extend in the axial direction of the power transmission shaft and cover at least a part of the sliding portion from the outer peripheral side of the sliding portion.

Description

Pedal starting device of power unit for saddle-ride type vehicle

Technical Field

The present invention relates to a kick-start device for a power unit for a saddle-ride type vehicle.

Background

Conventionally, a saddle-ride type vehicle is known in which a belt chamber for accommodating a belt type continuously variable transmission therein is formed by a transmission case connected to a main body of an internal combustion engine and disposed laterally to a rear wheel, and a transmission case cover attached to an outer side of the transmission case in a vehicle width direction (see, for example, patent document 1). In patent document 1, a transmission case cover is provided with a cooling air intake port for taking in cooling air from outside and a cooling air intake port for communicating the inside and outside of a belt chamber on the downstream side of an air guide path from the cooling air intake port, and a kick starter is supported by the transmission case cover, and the kick starter includes: a drive member having a pedal drive gear provided on a pedal shaft; a power transmission member having a power transmission shaft provided with a pedal driven gear driven by a pedal drive gear and a power transmission gear for transmitting power to a crankshaft of an internal combustion engine; and a spring member slidably attached to the power transmission member, the power transmission member being provided so as to penetrate the cooling air inlet.

Documents of the prior art

Patent document 1: japanese patent laid-open publication No. 2005-240734

However, in the above-described conventional kick-start device, since the spring member is provided in the air guide path, dust and the like are likely to adhere to the spring member. When the adhesion of dust or the like increases, it becomes difficult to support the power transmission member with appropriate friction by the spring member.

Disclosure of Invention

The present invention has been made in view of the above circumstances, and an object thereof is to provide a kick start device of a power unit for a saddle-ride type vehicle, which can support a power transmission member with appropriate friction by a spring member even if the spring member is provided in an air guide path.

In order to achieve the above object, the present invention provides a step-up starter of a power unit for a saddle-ride type vehicle, in which a belt chamber 59 for accommodating therein a belt type continuously variable transmission 22 is formed by a transmission case 55 connected to an engine main body 24 of an internal combustion engine 20 and disposed on a side of a rear wheel 14, and a transmission case cover 56 attached to an outer side of the transmission case 55 in a vehicle width direction, a cooling air intake port 85 for taking in cooling air from outside is provided in at least one of the transmission case 55 and the transmission case cover 56, and a step-up starter mechanism 61 is supported on the transmission case cover 56, the step-up starter mechanism 61 including: a drive member 90 having a pedal drive gear 101 provided on a pedal shaft 100; a power transmission member 92 having a power transmission shaft 93 provided with a pedal driven gear 102 driven by the pedal drive gear 101 and a power transmission gear 103 for transmitting power to the crankshaft 23 of the internal combustion engine 20; and a spring member 94 attached to a sliding portion 104 formed in the power transmission member 92, wherein the spring member 94 is attached to the sliding portion 104 so as to sandwich the sliding portion 104 between clamping portions 110, 110 of the spring member 94, and at least the sliding portion 104 of the kick start mechanism 61 is provided in an air guide path 88 of the cooling air sucked from the cooling air suction port 85, and wherein a protective wall 120 extending in the axial direction of the power transmission shaft 93 and covering at least a part of the sliding portion 104 from the outer peripheral side of the sliding portion 104 is provided on the transmission case cover 56.

According to the configuration of the present invention, the protective wall is provided on the transmission case cover on the wind guide path of the cooling wind and covers the sliding portion of the power transmission member from the outer peripheral side, and the sliding portion on the wind guide path can be protected from dust and the like by the protective wall. Therefore, it is possible to prevent dust and the like from adhering to the sliding portion, and to support the power transmission member with appropriate friction by the spring member.

In addition, the kick starter of the present invention may be configured such that: the protective wall 120 is provided at a position upstream of the sliding portion 104 in the air guide path 88.

According to the configuration of the present invention, since the protective wall is provided at a position upstream of the sliding portion in the wind guide path, the sliding portion can be protected by the protective wall on the upstream side of the cooling wind with respect to the sliding portion, and the sliding portion can be effectively protected from dust and the like.

In addition, the kick starter of the present invention may be configured such that: the transmission case cover 56 is provided with the cooling air inlet 85 and a cooling air inlet 58a communicating the inside and outside of the belt chamber 59 on the downstream side of the air guide path 88 with respect to the cooling air inlet 85, and the power transmission member 92 is inserted through the cooling air inlet 58a and the sliding portion 104 is formed on the upstream side of the cooling air inlet 58a on the air guide path 88.

According to the configuration of the present invention, the power transmission member penetrates the cooling air inlet located on the downstream side of the cooling air suction inlet, and the sliding portion is formed on the upstream side of the cooling air inlet. Accordingly, the extension amount of the protective wall with respect to the transmission case cover can be reduced in accordance with the position of the sliding portion, and the size can be reduced. Further, since the extension amount of the protection wall is reduced, the protection wall can be prevented from blocking the flow of the cooling air passing through the cooling air inlet.

Further, the kick starter of the present invention may be configured such that: the sliding portion 104 is formed to have a smaller diameter than the power transmission gear 103 at a position closer to the transmission case cover 56 than the power transmission gear 103.

According to the configuration of the present invention, the sliding portion is formed to have a smaller diameter than the power transmission gear at a position closer to the transmission case cover than the power transmission gear. Thus, the protective wall can be compactly arranged in the radial direction in cooperation with the small-diameter sliding portion. In addition, the extension of the protective wall with respect to the transmission case cover can be reduced in accordance with the position of the sliding portion. Therefore, the protective wall can be made compact in the radial direction and the axial direction of the sliding portion, and the protective wall can be prevented from blocking the cooling air.

In addition, the kick starter of the present invention may be configured such that: the power transmission gear 103 includes a first portion 106 extending radially outward with respect to the power transmission shaft 93 and a second portion 107 extending in the axial direction of the power transmission shaft 93, and the protective wall 120 faces the first portion 106.

According to the configuration of the present invention, since the protective wall faces the first portion extending radially outward, the protective wall can be formed compactly in the radial direction in accordance with the size of the first portion. In addition, the first portion and the protective wall cover the sliding portion, so that the sliding portion can be effectively protected from dust and the like.

In addition, the kick starter of the present invention may be configured such that: the sliding portion 104 is formed on the transmission case cover 56 side of the pedal driven gear 102.

According to the configuration of the present invention, since the slide portion is formed on the transmission case cover side of the pedal driven gear, the extension amount of the protection wall with respect to the transmission case cover can be reduced in accordance with the position of the slide portion, and the protection wall can be made compact. Further, since the sliding portion is located on the transmission case cover side with respect to the power transmission gear and the pedal driven gear, the spring member can be assembled from the transmission case cover side to the sliding portion.

In addition, the kick starter of the present invention may be configured such that: the protective wall 120 covers the slide part 104 and at least a part of the pedal driven gear 102.

According to the configuration of the present invention, since the protective wall covers at least a part of the slide portion and the pedal driven gear, the range in which the protective wall covers the slide portion can be increased in the axial direction, and the slide portion can be effectively protected.

Effects of the invention

According to the kick starter of the present invention, the power transmission member can be supported by the spring member with appropriate friction while preventing dust from adhering to the sliding portion.

In addition, the slide portion can be effectively protected by the protection wall on the upstream side of the slide portion.

In addition, the protection wall can be made compact, and the flow of cooling air can be prevented from being obstructed by the protection wall.

Further, the protective wall can be made compact in the radial direction and the axial direction of the sliding portion.

In addition, the first portion and the protective wall can effectively protect the sliding portion from dust and the like.

Further, the spring member can be assembled from the transmission case cover side sliding portion.

Further, the pedal driven gear can be covered with the protective wall, and the range in which the protective wall covers the sliding portion can be increased in the axial direction.

Drawings

Fig. 1 is a left side view of a rear portion of a straddle-type vehicle of an embodiment of the present invention.

Fig. 2 is a sectional view ii-ii of fig. 1.

Fig. 3 is an enlarged view of the structure of the peripheral portion of the kick start mechanism in fig. 2.

FIG. 4 is a partial IV-IV cross-sectional view of the arm portion of FIG. 1.

Fig. 5 is a view of the transmission case cover as viewed from the inside in the vehicle width direction.

Fig. 6 is a perspective view of the transmission case cover and the drive member as viewed from the inside in the vehicle width direction.

Fig. 7 is an enlarged cross-sectional view showing a state after the operation of the kick start mechanism in fig. 4.

Description of the reference numerals

1 saddle-ride type vehicle

14 rear wheel

15a pedal starting device

20 engines (internal combustion engine)

22-belt type continuously variable transmission

23 crankshaft

24 crankcase (internal-combustion engine main body)

55 Transmission case part (Transmission case)

56 casing of transmission case

58a cooling air inlet

59 with chamber

61 foot starting mechanism

85 cooling air suction inlet

88 wind guide path

90 drive component

92 power transmission member

93 power transmission shaft

94 spring part

100 foot pedal shaft

101 pedal driving gear

102 pedal driven gear

103 power transmission gear

104 sliding part

106 first part

107 second part

120 protective wall

Detailed Description

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the description, unless otherwise specified, the directions of the front, rear, left, right, and upper and lower sides are the same as the directions with respect to the vehicle body. In addition, reference symbol FR shown in the drawings indicates the front of the vehicle body, reference symbol UP indicates the upper side of the vehicle body, and reference symbol LH indicates the left side of the vehicle body.

Fig. 1 is a left side view of a rear portion of a straddle-type vehicle of an embodiment of the present invention. In fig. 1, only the left member is illustrated as a pair of left and right members.

The saddle-ride type vehicle 1 is a scooter type two-wheeled motorcycle having a step plate 11 of a low chassis on which feet of a passenger seated on a seat 10 are placed, and has a front wheel (not shown) in front of a body frame 12, and a rear wheel 14 as a driving wheel is pivotally supported on a unit swing type engine 15 (power unit) disposed at a rear portion of the vehicle.

The vehicle body frame 12 includes: a head pipe (not shown) provided at the tip end; a main frame 16 extending downward from the head pipe and then extending rearward; and a pair of right and left seat frames 17, 17 extending rearward and upward from the rear end of the main frame 16 to the rear end of the vehicle body.

Each seat frame 17 includes: a tilt frame 18 extending rearward and upward from the main frame 16, and a rear frame 19 bent at a rear end of the tilt frame 18 and extending rearward substantially horizontally.

A front fork (not shown) for supporting the front wheel is pivotally supported by the head pipe so as to be steerable.

The unit swing type engine 15 is a unit swing type power unit in which an engine 20 as an internal combustion engine is integrated with an arm portion 21 supporting the rear wheel 14. A belt type continuously variable transmission 22 (fig. 2) described later is housed inside the arm portion 21. The rear wheel 14 is pivotally supported on a rear wheel axle 14a at the rear end of the arm 21. A kick pedal 37 for manually starting the engine 20 is provided on an outer side surface of the arm portion 21.

The engine 20 includes: a crankcase 24 (engine main body) that houses the crankshaft 23 extending in the vehicle width direction, and a cylinder portion 25 that extends substantially horizontally forward from the crankcase 24.

The cylinder section 25 includes a cylinder block 25a, a cylinder head 25b, and a cylinder head 25c in this order from the crankcase 24 side.

The unit swing type engine 15 is connected to the rear portion of the main frame 16 via a connection member 26 connected to the lower portion of the front portion of the crankcase 24, and swings freely up and down about a pivot shaft 27 provided on the connection member 26. A rear suspension 28 is bridged between the rear end of the arm 21 and the left seat frame 17.

The intake device of the engine 20 includes: an air cleaner box 29, and a throttle body 30 disposed downstream of the air cleaner box 29.

The air cleaner box 29 is supported by the arm 21, and is disposed between the upper surface of the arm 21 and the left seat frame 17. The throttle body 30 is disposed in front of the air cleaner box 29 and above the unit swing engine 15. The throttle body 30 has an upstream portion connected to the air cleaner box 29 and a downstream portion connected to an intake port on the upper surface of the cylinder head 25 b.

The exhaust pipe 31 is drawn out downward from the lower surface of the cylinder head 25b, extends rightward and rearward, and is connected to a muffler 32 disposed on the right side of the rear wheel 14.

A storage box 33 capable of storing articles such as helmets is provided above the engine 20 between the left and right tilt frames 18, 18.

The fuel tank 34 is disposed between the left and right rear racks 19, 19 at the rear of the console box 33.

The seat 10 covers the storage box 33 and the fuel tank 34 from above. A rear fender 35 that covers the rear wheel 14 from above is disposed below the fuel tank 34.

The straddle-type vehicle 1 includes a vehicle body cover 36 that covers the storage box 33, the fuel tank 34, the seat frames 17, and the like from the outside.

The side bracket 38 is mounted to the rear of the main frame 16. The main stand 39 is mounted on the lower portion of the crankcase 24.

Fig. 2 is a sectional view ii-ii of fig. 1.

The crankcase 24 is a left-right divided crankcase, and is formed by joining a first (left) crankcase 41 and a second (right) crankcase 42.

The first crankcase 41 and the second crankcase 42 include a support wall 41a and a support wall 42a that are orthogonal to the crankshaft 23, and left and right bearings 43 and 43 that support the crankshaft 23 are provided on the support wall 41a and the support wall 42 a. A crank chamber 46 is formed between the support wall 41a and the support wall 42 a.

A piston 44 reciprocating in the cylinder block 25a is connected to the crankshaft 23 in a crank chamber 46 via a connecting rod 47.

The crankcase 24 includes a generator chamber 45 on the other side (right side) of the crank chamber 46. The generator chamber 45 is closed by a fan cover 48.

The crankshaft 23 includes a generator 49 that generates electric power by rotation of the crankshaft 23 at a portion extending into the generator chamber 45. A fan 50 for blowing air toward the engine 20 is provided on an outer side surface of the generator 49.

The one crankcase 41 includes an outer wall portion 41b that covers the support wall 41a from the outside. A cam chain chamber 51 is formed between the outer side wall portion 41b and the support wall 41 a. The valve mechanism 52 of the cylinder head 25b is driven by a cam chain 53 that passes through the cam chain chamber 51 and spans between the crankshaft 23 and the valve mechanism 52.

The crankcase 24 integrally includes a transmission case portion 55 (transmission case) connected to an outer side portion of the one crankcase 41 and extending rearward. The transmission case portion 55 extends from one side of the crank chamber 46 to one side (left side) of the rear wheel 14.

Specifically, the transmission case portion 55 is formed in a box shape in which an outer side surface in the vehicle width direction is open. The transmission case portion 55 includes an inner wall portion 55a extending along one outer side surface of the rear wheel 14, and a peripheral wall portion 55b erected outward in the vehicle width direction from a peripheral edge portion of the inner wall portion 55 a. The outer side wall portion 41b of the one crankcase 41 constitutes a front end portion of the inner side wall portion 55 a.

The unit swing type engine 15 includes a transmission case cover 56 that covers and closes an open portion of an outer side surface of the transmission case portion 55.

Specifically, the transmission case cover 56 is formed in a box shape having an inner side surface in the vehicle width direction opened. The transmission case cover 56 includes a cover side wall portion 56a facing the inner wall portion 55a of the transmission case portion 55, and a cover peripheral wall portion 56b erected inward in the vehicle width direction from the entire circumference of the peripheral edge portion of the cover side wall portion 56 a.

The transmission case cover 56 is made of light metal such as aluminum alloy or magnesium alloy.

The arm portion 21 is configured by fixing the transmission case cover 56 to the transmission case portion 55. The transmission case cover 56 is fixed by a plurality of bolts 57 (fig. 1) in a state where the inner end surface of the cover peripheral wall portion 56b is fitted to the outer end surface of the peripheral wall portion 55 b.

Inside the arm portion 21, a wind deflector 58 is provided to partition the space inside the arm portion 21 in the vehicle width direction. By providing the air guide plate 58, a belt chamber 59 for housing the belt type continuously variable transmission 22 and a pedal starting mechanism housing chamber 60 located outside the belt chamber 59 are formed inside the arm portion 21. A kick start mechanism 61 for starting the engine 20 by operating the kick start pedal 37 is housed in the kick start mechanism housing chamber 60. The kick starter 15a of the unit swing type engine 15 includes at least a kick starter mechanism 61 and a transmission case cover 56.

The crankshaft 23 includes a pulley support shaft portion 23a that penetrates the outer wall portion 41b and protrudes into the belt chamber 59. An output shaft 62 extending in parallel with the sheave support shaft portion 23a in the belt chamber 59 is provided at a rear portion in the arm portion 21. The output shaft 62 is rotatably supported by bearings 63, 63 provided in the transmission case portion 55.

The output shaft 62 is provided with a centrifugal clutch mechanism 64 that controls power transmission from the belt type continuously variable transmission 22 to the rear wheel 14 side.

The belt type continuously variable transmission 22 includes: a driving portion 65 provided on the sheave support shaft portion 23a, a driven portion 66 provided on the output shaft 62, and a V-belt 67 connecting the driving portion 65 and the driven portion 66.

The drive unit 65 includes: a drive pulley 68 around which the V-belt 67 is wound, a retaining plate 69 fixed to the vehicle width direction inner side of the drive pulley 68, and a roller weight 70 sandwiched between the drive pulley 68 and the retaining plate 69.

The drive pulley 68 includes a disc-shaped fixed pulley piece 68a fixed to an axial end portion of the pulley support shaft portion 23a, and a movable pulley piece 68b movable in the axial direction on the pulley support shaft portion 23 a. The roller weight 70 moves along the slope portion 69a of the holding plate 69.

The roller weight 70 is moved by a centrifugal force generated by the rotation of the crankshaft 23, and the movable sheave piece 68b is pushed by the moved roller weight 70 and moved in the axial direction toward the fixed sheave piece 68 a.

The V-belt 67 is sandwiched between the movable sheave piece 68b and the fixed sheave piece 68 a.

The fixed sheave piece 68a is fixed by a nut 71 fastened to an axial end portion of the sheave support shaft portion 23a while being inserted therethrough and in contact with the stepped portion 23 b.

A wing-like blower fan 72 projecting outward in the vehicle width direction is formed on the outer side surface of the fixed sheave piece 68 a.

The driven portion 66 of the belt type continuously variable transmission 22 includes: an outer shaft 74 rotatably fitted to the outer peripheral portion of the output shaft 62 via bearings 73, 73; a driven pulley 75 provided on the outer shaft 74; and a coil spring 76 that urges the driven pulley 75 in the axial direction.

The driven pulley 75 includes a fixed pulley piece 75a fixed to the outer shaft 74 and a movable pulley piece 75b movable in the axial direction on the outer shaft 74. The movable sheave piece 75b is urged by a coil spring 76 to move toward the fixed sheave piece 75 a. The V-belt 67 is sandwiched between the movable pulley piece 75b and the fixed pulley piece 75 a.

The belt type continuously variable transmission 22 changes the pulley diameter with respect to the V-belt 67 by displacing the movable pulley piece 68b and the movable pulley piece 75b in the axial direction, and continuously changes the transmission ratio.

The clutch mechanism 64 includes: a disc-shaped clutch plate 79 fixed to the outer end of the outer shaft 74, a plurality of clutch shoes 80 supported by the clutch plate 79, and a cup-shaped clutch housing 81 fixed to the outer end of the output shaft 62. The coil spring 76 is mounted between the clutch plate 79 and the movable pulley plate 68 b.

When the output of the crankshaft 23 is transmitted to the driven pulley 75 via the V-belt 67, the outer shaft 74 rotates on the output shaft 62, and the clutch shoes 80 move to the outer peripheral side by the centrifugal force of the rotation. When the clutch shoe 80 is frictionally engaged with the inner peripheral surface of the clutch housing 81, the clutch mechanism 64 is brought into a connected state, and the output shaft 62 and the outer shaft 74 rotate integrally.

The rotation of the output shaft 62 is transmitted to the rear axle 14a via a reduction mechanism 82 including an intermediate shaft 82a and a plurality of gears.

Fig. 3 is an enlarged view of the structure of the peripheral portion of the kick start mechanism 61 in fig. 2.

The transmission case cover 56 includes a cylindrical cooling air intake port 85 that opens forward on the front surface of the cover peripheral wall portion 56 b.

As shown in fig. 1, the cooling air intake port 85 is connected to a portion of the vehicle body frame 12 located in front of the unit swing type engine 15 via a duct 86 extending forward. The air sucked into the hollow vehicle body frame 12 through an intake port (not shown) of the vehicle body frame 12 flows into the kick-start mechanism storage chamber 60 and the belt chamber 59 through the duct 86 and the cooling air intake port 85.

Fig. 4 is a partial iv-iv cross-sectional view of arm portion 21 of fig. 1. Fig. 5 is a view of the transmission case cover 56 as viewed from the inside in the vehicle width direction. Fig. 5 shows a state after the air deflector 58 is removed.

Referring to fig. 2 to 5, the air guide plate 58 extends from a position laterally covering the driving pulley 68 to a position forward of the driven pulley 75 in the front-rear direction. The air guide plate 58 has a cooling air inlet 58a that communicates the inside and outside of the belt chamber 59 on the extension line of the sheave support shaft 23 a. The cooling air inlet 58a is an opening that communicates the front portion of the pedal-start mechanism housing chamber 60 with the front portion of the belt chamber 59. The air guide plate 58 is fixed to the transmission case cover 56 by fixing bolts 56c (fig. 4) fastened to the inner surface of the transmission case cover 56.

The transmission case cover 56 includes a cooling air outlet 87 (fig. 3) on the lower surface of the cover peripheral wall portion 56b, which communicates the belt chamber 59 with the outside of the arm portion 21. The cooling air outlet 87 is provided in the vicinity of the driven pulley 75 behind the air guide plate 58.

The cooling air W flowing into the pedal-start mechanism housing chamber 60 from the cooling air inlet 85 flows into the belt chamber 59 through the cooling air inlet 58a, cools the belt type continuously variable transmission 22, the clutch mechanism 64, and the like, and is discharged to the outside from the cooling air outlet 87. The flow of the cooling air W is promoted by the rotation of the blower fan 72.

That is, an air guide passage 88 is formed inside the arm portion 21, and the cooling air W flows from the cooling air inlet 85 into the pedal starting mechanism housing chamber 60, then flows from the cooling air inlet 58a into the belt chamber 59, and is then discharged from the cooling air outlet 87.

The kick start mechanism 61 includes: a kick pedal 37; a drive member 90 that directly rotates by a pedaling operation based on the kick pedal 37; a return spring 91 that biases the drive member 90 to an initial position; and a power transmission member 92 driven by the driving member 90 and rotating the crankshaft 23.

Further, the kick start mechanism 61 includes: a power transmission shaft 93 rotatably supporting the power transmission member 92; a spring member 94 that restricts rotation of the drive member 90; a spring guide 95 that guides the spring member 94; a crankshaft side driven gear 96 integrally provided on the crankshaft 23; and a return spring support portion 97 supporting one end 91a of the return spring 91.

Specifically, the driving member 90 includes: a pedal shaft 100 provided so as to penetrate the cover side wall portion 56a in the vehicle width direction, and a pedal drive gear 101 fixed to an inner end portion of the pedal shaft 100.

The cover side wall portion 56a includes a tubular step shaft support boss portion 56d projecting inward in the vehicle width direction from the inner surface thereof. The pedal shaft 100 is fitted to and supported by the inner peripheral portion of the pedal shaft support boss 56 d.

The kick pedal 37 is fixed to an end portion of the pedal shaft 100 that protrudes outward in the vehicle width direction from the cover side wall portion 56 a.

As shown in fig. 5, the pedal drive gear 101 is a gear formed in a semicircular disc shape, and the central portion thereof is coupled to the pedal shaft 100. The pedal drive gear 101 includes a tooth portion 101a on the outer peripheral portion thereof, which meshes with the power transmission member 92. The pedal drive gear 101 is a helical gear in which a tooth portion 101a is formed in a helical shape with respect to the axis.

The return spring 91 is a torsion coil spring provided such that an inner circumferential portion of the coil portion is fitted to an outer circumferential portion of the pedal shaft support boss 56 d. One end 91a of the return spring 91 is supported by the return spring support portion 97, and the other end 91b is coupled to the pedal drive gear 101.

The cover side wall portion 56a includes a cylindrical power transmission shaft support boss portion 56e protruding inward in the vehicle width direction from the inner surface thereof at a position forward of the step shaft support boss portion 56 d.

The outer end portion of the power transmission shaft 93 is fitted to the power transmission shaft support boss portion 56e from the inside in the vehicle width direction, and is fixed to the power transmission shaft support boss portion 56e so as to be unrotatable.

The power transmission member 92 integrally includes a pedal driven gear 102 meshing with the pedal drive gear 101 and a power transmission gear 103 meshing with the crankshaft side driven gear 96. The power transmission member 92 and the power transmission shaft 93 are disposed coaxially with the crankshaft 23.

The pedal driven gear 102 includes a support hole 102a formed in the center thereof in a cylindrical shape extending in the vehicle width direction, through which the power transmission shaft 93 is inserted. The pedal driven gear 102 is rotatable about the power transmission shaft 93 and is movable in the axial direction on the power transmission shaft 93.

In the present embodiment, since the power transmission member 92 is axially supported by the power transmission shaft 93 fixed to the power transmission shaft support boss portion 56e, the amount of distortion of the power transmission shaft 93 is small when a bending moment acts on the power transmission shaft 93 via the power transmission member 92. Therefore, the backlash of the power transmission member 92 can be reduced. Further, since the power transmission shaft 93 and the power transmission member 92 are made of a steel material, even if the power transmission member 92 is configured to slide with respect to the power transmission shaft 93, the wear resistance is high.

The pedal driven gear 102 includes a tooth portion 102b on an outer peripheral portion thereof, with which the tooth portion 101a of the pedal drive gear 101 is engaged. The pedal driven gear 102 is a helical gear in which tooth portions 102b are formed in a helical shape with respect to the axis.

The pedal driven gear 102 includes a sliding portion 104 having an outer diameter smaller than the tooth portion 102b at an outer end in the vehicle width direction, i.e., an end on the cover side wall portion 56a side.

The sliding portion 104 includes: a groove portion 104a in which the outer peripheral surface of the sliding portion 104 is recessed in an annular shape, and a tapered portion 104b in which the outer peripheral portion is narrowed from the groove portion 104a toward the vehicle width direction outer side front end. A washer 105 is attached between the tip of the tapered portion 104b and the power transmission shaft support boss 56 e.

The power transmission gear 103 is fixed to an inner end portion of the step driven gear 102 in the vehicle width direction, that is, an end portion on the crankshaft 23 side. The power transmission member 92 is provided so as to penetrate the cooling air inlet 58a of the air guide plate 58 from the pedal-start mechanism housing chamber 60 side, and the power transmission gear 103 is located in the belt chamber 59.

Specifically, the power transmission gear 103 includes: a disc-shaped first portion 106 extending radially outward from an inner end portion of the pedal driven gear 102, and a cylindrical second portion 107 extending axially toward the crankshaft 23 side from a peripheral portion of the first portion 106.

The power transmission gear 103 is disposed opposite to the crankshaft side driven gear 96 and the nut 71. The second portion 107 is formed to have a larger inner diameter than the nut 71, and the nut 71 is accommodated inside the second portion 107.

A plurality of tooth portions 107a that mesh with the crankshaft side driven gear 96 are formed at intervals in the circumferential direction at the tip end portion of the second portion 107.

The crankshaft side driven gear 96 includes: a base portion 96a formed in a circular plate shape; and a tooth portion 96b that protrudes from the peripheral edge portion of the base portion 96a toward the power transmission gear 103 side and meshes with the power transmission gear 103. The plurality of teeth 96b are provided at intervals in the circumferential direction.

The crankshaft side driven gear 96 is inserted into the pulley support shaft portion 23a and is sandwiched between the nut 71 and the fixed pulley piece 68 a.

Since the pedal driving gear 101 and the pedal driven gear 102 are helical gears, when the pedal driven gear 102 is rotated by the pedal driving gear 101, the power transmission member 92 is moved in the axial direction by the thrust force. When the power transmission member 92 moves toward the crankshaft 23, the tooth portion 107a of the second portion 107 of the power transmission gear 103 meshes with the tooth portion 96b of the crankshaft side driven gear 96.

The second portion 107 and the crankshaft side driven gear 96 constitute a one-way clutch, and the crankshaft side driven gear 96 meshes with the second portion 107 when the relative rotation direction of the power transmission gear 103 and the crankshaft side driven gear 96 is one direction; when the relative rotation direction is the other direction, the engagement between the crankshaft side driven gear 96 and the second portion 107 is released.

Specifically, the tooth portion 107a and the tooth portion 96b have inclined surface portions inclined so as to be narrower toward the tip end side on one circumferential surface, and have vertical wall portions extending straight in the axial direction on the other circumferential surface. The second portion 107 and the crankshaft side driven gear 96 are in the engaged state in the rotational direction in which the vertical wall portions abut against each other, and the power transmission member 92 is moved toward the cover side wall portion 56a side and the one-way clutch is in the disengaged state in the rotational direction in which the inclined surface portions abut against each other.

The spring member 94 is attached to the groove portion 104a of the slide portion 104 of the power transmission member 92. The spring member 94 is a spring formed by bending a wire rod into a predetermined shape by bending or the like.

The spring member 94 has: a pair of clamping portions 110, 110 extending in parallel to each other in a direction substantially orthogonal to the axial direction of the power transmission member 92; and a connecting portion 111 connecting one ends of the clamping portions 110, 110 in the longitudinal direction. The other ends in the longitudinal direction of the clamping portions 110, 110 are not connected to each other, and the other ends are open.

The connecting portion 111 extends to bend substantially at right angles to the sandwiching portions 110, 110 toward the outside in the vehicle width direction, that is, toward the cover side wall portion 56 a.

The spring member 94 is attached to the sliding portion 104 so as to sandwich the sliding portion 104 between the clamping portions 110, 110. The clamping portions 110, 110 include engaging portions 110a, 110a that engage with the groove portion 104a of the slide portion 104 at an intermediate portion in the longitudinal direction. The engaging portions 110a, 110a are formed in an arc shape along the shape of the groove portion 104 a.

Fig. 6 is a perspective view of the transmission case cover 56 and the drive member 90 as viewed from the inside in the vehicle width direction.

Referring to fig. 4 to 6, the spring guide 95 is provided on the transmission case cover 56 in front of and below the power transmission member 92. The spring guide 95 has a pair of ribs 95a, 95a arranged to sandwich the coupling portion 111 at the lower end of the spring member 94 from the front to the rear. The ribs 95a, 95a are erected inward in the vehicle width direction from the inner surface of the cover side wall portion 56 a.

The spring member 94 is sandwiched between the ribs 95a and 95a by the coupling portion 111, and rotation about the sliding portion 104 is restricted. That is, the ribs 95a, 95a are rotation stopping members of the spring member 94. Since the ribs 95a, 95a are located at the front lower side of the power transmission member 92, the spring member 94 is disposed in a posture slightly inclined rearward from the vertical in a side view.

The spring member 94 restricts the rotation of the power transmission member 92 by sandwiching the power transmission member 92 via the sliding portion 104. Although the pedal driven gear 102 of the power transmission member 92 is engaged with the pedal driving gear 101, since there is a backlash between the pedal driven gear 102 and the pedal driving gear 101, a sound is generated when the power transmission member 92 rotates due to vibration or the like. In the present embodiment, since the rotation of the power transmission member 92 can be restricted by the spring member 94, it is possible to prevent the generation of noise due to the backlash of the power transmission member 92.

When the engine 20 is started by the kick start mechanism 61, the power transmission member 92 is forcibly rotated by the kick drive gear 101 and is rotated against friction generated in the sliding portion 104 by the engaging portions 110a, 110a of the spring member 94. The sliding portion 104 can be coated with grease for smooth rotation of the power transmission member 92.

The return spring support portion 97 is a pin-shaped member that is erected inward in the vehicle width direction from the inner surface of the cover side wall portion 56 a. As shown in fig. 5, the return spring support portion 97 is located on the opposite side of the ribs 95a and 95a, i.e., above the power transmission member 92, with the power transmission member 92 interposed therebetween, and is provided so as to penetrate between the other end portions of the clamping portions 110 and 110 from the inside in the vehicle width direction. The spring member 94 can also be stopped by the return spring support 97.

As shown in fig. 4, one end 91a of the return spring 91 is connected to the return spring support portion 97 at a position outside the sandwiching portions 110, 110 in the vehicle width direction.

The transmission case cover 56 includes a protruding portion 112 protruding from the cover side wall portion 56a toward the other end portions of the clamping portions 110, 110. The protruding portion 112 includes: a front wall 112a extending vertically along a front edge of the other end of the front clamping portion 110; a rear wall 112b extending vertically along a rear edge of the other end portion of the rear clamping portion 110; and an upper wall 112c that faces the front end surface of the other end of the clip portion 110 and connects the front wall 112a and the rear wall 112 b.

A front end 112d (fig. 4) of the projecting portion 112 on the vehicle width direction inner side is located on the cover side wall portion 56a side of the other end portions of the sandwiching portions 110, 110.

Fig. 7 is an enlarged cross-sectional view showing a state after the operation of the foot start mechanism 61 in fig. 4.

Referring to fig. 3 to 5 and 7, when the kick pedal 37 is operated to start the engine 20, the kick drive gear 101 rotates in the rotation direction R1 of fig. 5, and the power transmission member 92 rotates in the rotation direction R2. Thereby, the power transmission member 92 moves toward the crankshaft 23, and the power transmission gear 103 meshes with the crankshaft driven gear 96, thereby rotating the crankshaft 23. At the same time, the engine 20 is started by controlling ignition and fuel supply.

At this time, the power transmission member 92 rotates relative to the spring member 94 locked by the ribs 95a, and the spring member 94 is guided along the inner surfaces of the ribs 95a, 95a while being kept in the locked state, and moves in the axial direction toward the crankshaft 23 side together with the power transmission member 92 as shown in fig. 7.

When the engine 20 is started, the rotational speed of the crankshaft 23 becomes higher than the rotational speed of the power transmission member 92, and the power transmission member 92 is pushed by the inclined surface portion of the tooth portion 96b of the crankshaft side driven gear 96 and moves outward in the vehicle width direction, thereby releasing the connection by the one-way clutch.

Thereafter, when the operation of the kick pedal 37 is released, the kick drive gear 101 is returned to the initial position by the urging force of the return spring 91. At the same time, the power transmission member 92 is rotated in the direction opposite to the rotation direction R2 by the pedal drive gear 101 and moves outward in the vehicle width direction, thereby returning to the home position on the cover side wall portion 56a side.

Referring to fig. 3 to 7, the transmission case cover 56 integrally includes a protective wall 120 extending inward in the vehicle width direction from the cover side wall portion 56a in the axial direction of the power transmission shaft 93.

The protective wall 120 is positioned on the front side of the power transmission member 92, and covers the power transmission member 92 from the front side to protect it.

Specifically, the protective wall 120 extends in the axial direction of the power transmission member 92 to the vicinity of the first portion 106 of the power transmission gear 103, and covers the step driven gear 102 and the sliding portion 104 from the front. The protective wall 120 is provided upright on the base end portion of the power transmission shaft support boss 56 e.

The protective wall 120 is formed in an arc shape so as to follow the outer peripheral portion of the pedal driven gear 102.

The protective wall 120 is provided at a position overlapping the outer peripheral portion of the first portion 106 in the radial direction of the power transmission member 92, and has an outer diameter substantially equal to the outer diameter of the second portion 107 when the protective wall is centered on the power transmission shaft 93. An axial front end 120a of the protective wall 120 faces the outer surface of the first portion 106.

The protective wall 120 is provided only in front of the power transmission gear 103, and the circumferential range in which the protective wall 120 is provided is smaller than 180 °.

As shown in fig. 3, protective wall 120 is located on the front side of slide portion 104 in wind guide path 88 of cooling wind W and on the upstream side of slide portion 104 in the flow direction of cooling wind W. Thus, the cooling air W flowing into the pedal starting mechanism housing chamber 60 flows downstream after hitting the protective wall 120, and the protective wall 120 can prevent the cooling air W from directly hitting the sliding portion 104. Therefore, dust and the like contained in the cooling air W can be prevented from adhering to the sliding portion 104. Further, even when grease is applied to the sliding portion 104, dust and the like can be prevented from adhering to the grease.

Although the power transmission gear 103 of the power transmission member 92 is provided so as to penetrate the cooling air inlet 58a of the air guide plate 58, the protection wall 120 covers the step driven gear 102 and the sliding portion 104 located in the step-start mechanism housing chamber 60, and is located upstream of the cooling air inlet 58a on the air guide passage 88. This makes it possible to reduce the axial extension of the protective wall 120 in accordance with the dimensions of the pedal driven gear 102 and the sliding portion 104, and to provide the protective wall 120 in a compact manner.

The sliding portion 104 is formed smaller in diameter than the power transmission gear 103 on the cover side wall portion 56a side of the power transmission gear 103, and the protective wall 120 covers the sliding portion 104 on the cover side wall portion 56a side of the power transmission gear 103. Therefore, the protection wall 120 can be made compact in the radial direction in cooperation with the small-diameter sliding portion 104, and the protection wall 120 can be made compact in the axial direction.

Further, the distal end portion 120a of the protection wall 120 is close to the first portion 106 of the power transmission gear 103 and faces the outer side surface of the first portion 106, and the distal end portion 120a side of the protection wall 120 is closed by the first portion 106. Therefore, the cooling air W can be suppressed from flowing into the sliding portion 104 from the distal end portion 120a side, and dust and the like can be suppressed from adhering to the sliding portion 104.

When assembling the kick start mechanism 61, first, the drive member 90 and the return spring 91 are assembled to the transmission case cover 56. Next, the spring member 94 is assembled to the transmission case cover 56. Here, the spring member 94 is positioned by the ribs 95a, 95a and the return spring support portion 97.

Then, the power transmission member 92 is inserted in the axial direction from the inside in the vehicle width direction so that the tooth portion 102b follows the tooth portion 101a of the pedal drive gear 101, and is assembled by inserting the power transmission shaft 93 fixed to the transmission case cover 56 side. At this time, the tapered portion 104b of the slide portion 104 is inserted through the spring member 94 while pushing the engaging portions 110a, 110a of the expanding spring member 94, and finally, the engaging portions 110a, 110a are engaged with the groove portion 104a of the slide portion 104.

As shown in fig. 5, proper assembly of the spring member 94 can be confirmed by the other end portion of the spring member 94 being located inside the protruding portion 112. Further, a recess, an imprint, or the like may be provided in place of the protrusion 112 for confirming the assembled state of the spring member 94.

As described above, according to the embodiment to which the present invention is applied, the step-start device 15a is formed with the belt chamber 59 that houses the belt type continuously variable transmission 22 therein, by the transmission case portion 55 that is connected to the crankcase 24 of the engine 20 and is disposed on the side of the rear wheel 14, and the transmission case cover 56 that is attached to the vehicle width direction outer side of the transmission case portion 55, the transmission case cover 56 is provided with the cooling wind intake port 85 that takes in the cooling wind W from the outside, and the transmission case cover 56 supports the step-start mechanism 61, and the step-start mechanism 61 includes: a drive member 90 having a pedal drive gear 101 provided on a pedal shaft 100; a power transmission member 92 having a pedal driven gear 102 driven by a pedal drive gear 101 and a power transmission gear 103 for transmitting power to the crankshaft 23 of the engine 20, provided on a power transmission shaft 93; and a spring member 94 attached to a sliding portion 104 formed on the power transmission member 92, wherein the spring member 94 is attached to the sliding portion 104 so as to sandwich the sliding portion 104 between clamping portions 110, 110 of the spring member 94, at least the sliding portion 104 of the kick start mechanism 61 is provided in the air guide passage 88 of the cooling air W sucked from the cooling air suction port 85, and the transmission case cover 56 is provided with a protective wall 120 extending in the axial direction of the power transmission shaft 93 and covering at least a part of the sliding portion 104 from the outer peripheral side of the sliding portion 104. Accordingly, the sliding portion 104 on the air guide path 88 can be protected from dust and the like by the protective wall 120 provided on the transmission case cover 56 on the air guide path 88 and covering the sliding portion 104 from the outer peripheral side. Therefore, it is possible to prevent dust and the like from adhering to the sliding portion 104, and to support the power transmission member 92 with appropriate friction by the spring member 94.

Further, since the protective wall 120 is provided at a position upstream of the slide portion 104 in the wind guide path 88, the slide portion 104 can be protected by the protective wall 120 on the upstream side of the cooling wind W with respect to the slide portion 104, and the slide portion 104 can be effectively protected from dust and the like.

The transmission case cover 56 is provided with a cooling air inlet 85 and a cooling air inlet 58a communicating the inside and outside of the belt chamber 59 on the downstream side of the air guide path 88 with respect to the cooling air inlet 85, the power transmission member 92 penetrates the cooling air inlet 58a, and the sliding portion 104 is formed on the upstream side of the cooling air inlet 58a on the air guide path 88. Accordingly, the extension of the protective wall 120 with respect to the transmission case cover 56 can be reduced in accordance with the position of the slide portion 104, and the size can be reduced. Further, since the extension of the protection wall 120 is reduced, the protection wall 120 can be prevented from blocking the flow of the cooling air W passing through the cooling air inlet 58 a.

Further, the sliding portion 104 is formed to have a smaller diameter than the power transmission gear 103 at a position closer to the transmission case cover 56 side than the power transmission gear 103. This allows the protective wall 120 to be compactly arranged in the radial direction in cooperation with the small-diameter slide portion 104. In addition, the extension of the protective wall 120 with respect to the transmission case cover 56 can be reduced in accordance with the position of the slide portion 104. Therefore, the protective wall 120 can be made compact in the radial direction and the axial direction of the sliding portion 104, and the sliding portion 104 can be prevented from blocking the cooling air.

The power transmission gear 103 has a first portion 106 extending radially outward with respect to the power transmission shaft 93 and a second portion 107 extending in the axial direction of the power transmission shaft 93, and the protective wall 120 faces the first portion 106. This allows the protective wall 120 to be formed compactly in the radial direction in accordance with the size of the first portion 106. Further, by covering the sliding portion 104 with the first portion 106 and the protective wall 120, the sliding portion 104 can be effectively protected from dust and the like.

Further, since the slide portion 104 is formed on the transmission case cover 56 side of the pedal driven gear 102, the amount of extension of the protection wall 120 with respect to the transmission case cover 56 can be reduced in accordance with the position of the slide portion 104, and the protection wall 120 can be made compact. Further, since the slide portion 104 is positioned on the transmission case cover 56 side with respect to the power transmission gear 103 and the pedal driven gear 102, the spring member 94 can be assembled from the transmission case cover 56 side to the slide portion 104.

Further, since the protective wall 120 covers at least a part of the slide part 104 and the pedal driven gear 102, the range in which the protective wall 120 covers the slide part 104 can be increased in the axial direction, and the slide part 104 can be effectively protected.

The above embodiment shows an aspect to which the present invention is applied, and the present invention is not limited to the above embodiment.

In the above embodiment, the case where the power transmission member 92 is supported by the power transmission shaft 93 fixed to the power transmission shaft support boss portion 56e has been described, but the present invention is not limited thereto. For example, a power transmission shaft may be integrally formed in the power transmission member 92 so as to be non-rotatable with respect to the power transmission member 92, and the power transmission shaft may be fitted to the inner peripheral portion of the power transmission shaft support boss portion 56e to be rotatably shaft-supported on the inner peripheral portion of the power transmission shaft support boss portion 56 e. In this case, since the distance between the pedal drive gear 101 and the shaft support portion of the power transmission shaft is longer than that in the above embodiment, the amount of distortion of the power transmission shaft tends to be larger than that in the above embodiment.

In the above-described embodiment, the case where the cooling air intake port 85 is provided in the transmission case cover 56 has been described, but the present invention is not limited to this, and the cooling air intake port may be provided in at least one of the transmission case portion 55 and the transmission case cover 56.

In the above embodiment, the case where the transmission case cover 56 integrally includes the protective wall 120 has been described, but the present invention is not limited to this, and a protective wall separately formed from the transmission case cover 56 may be attached to the transmission case cover 56.

Claims (6)

1. A kick-start device of a power unit for a saddle-ride type vehicle, which is formed with a belt chamber (59) for accommodating a belt type continuously variable transmission (22) therein by a transmission case (55) connected to an engine body (24) of an internal combustion engine (20) and arranged on a side of a rear wheel (14), and a transmission case cover (56) attached to an outer side of the transmission case (55) in a vehicle width direction, wherein at least one of the transmission case (55) and the transmission case cover (56) is provided with a cooling wind suction port (85) for sucking cooling wind from outside, and a kick-start mechanism (61) is supported by the transmission case cover (56), the kick-start mechanism (61) comprising: a drive member (90) provided with a pedal drive gear (101) on a pedal shaft (100); a power transmission member (92) having a power transmission shaft (93) provided with a pedal driven gear (102) driven by the pedal drive gear (101) and a power transmission gear (103) for transmitting power to a crankshaft (23) of the internal combustion engine (20); and a spring member (94) attached to a sliding portion (104) provided at an outer end portion of the pedal driven gear (102) in the vehicle width direction, wherein the spring member (94) is attached to the sliding portion (104) so as to sandwich the sliding portion (104) between clamping portions (110 ) of the spring member (94), and wherein at least the sliding portion (104) of the pedal starting mechanism (61) is provided in an air guide path (88) for cooling air sucked from the cooling air suction port (85), the pedal starting device being characterized in that,

the transmission case cover (56) is provided with a protective wall (120) that extends in the axial direction of the power transmission shaft (93) and that covers at least a portion of the sliding section (104) from the outer peripheral side of the sliding section (104) and at a position upstream of the sliding section (104) in the flow direction of the cooling air.

2. The pedal starting device of a power unit for a saddle-ride type vehicle according to claim 1, wherein the transmission case cover (56) is provided with the cooling air intake port (85) and a cooling air inlet port (58a) that communicates the inside and outside of the belt chamber (59) on the downstream side of the air guide path (88) with respect to the cooling air intake port (85),

the power transmission member (92) penetrates the cooling air inlet (58a), and the sliding portion (104) is formed on the air guide path (88) on the upstream side of the cooling air inlet (58 a).

3. The pedal starting device of a power unit for a saddle-ride type vehicle according to claim 1, wherein the sliding portion (104) is formed to have a smaller diameter than the power transmission gear (103) at a position closer to the transmission case cover (56) than the power transmission gear (103).

4. The pedal starting device of a power unit for a saddle-ride type vehicle according to claim 2, wherein the power transmission gear (103) has a first portion (106) extending radially outward with respect to the power transmission shaft (93) and a second portion (107) extending in an axial direction of the power transmission shaft (93),

the protective wall (120) is opposite the first portion (106).

5. The kick start device of a power unit for a saddle-ride type vehicle according to claim 2, wherein the sliding portion (104) is formed on the transmission case cover (56) side than the kick driven gear (102).

6. The pedal starting device of a power unit for a saddle-ride type vehicle according to claim 5, wherein the protective wall (120) covers the sliding portion (104) and at least a part of the pedal driven gear (102).

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