JP2015006847A - Vehicular speed detection structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicular speed detection structure capable of improving detection accuracy by reducing a noise while securing a large degree of freedom in a position of disposing a detected part and a disposing position of a vehicle speed sensor without allowing the diameter of a final gear to grow.SOLUTION: In a vehicular speed detection structure in which a final gear 100 of a reduction gear train 38 constituting a part of power transmission means housed in a transmission case 31L is fixed to an axle 110, with a vehicle speed sensor 150 attached to the transmission case 31L in a manner so that a detection part 150s of the vehicle speed sensor 150 faces, in an axial direction, a detected part 105 integrally formed on one side of the final gear in the axial direction, the detected part 105 is formed in protrusion in the axial direction further than one side of a gear portion of the final gear 100 in the axial direction.

Description

  The present invention relates to a vehicle speed detection structure that detects the rotational speed of an axle by a vehicle speed sensor.

  In the power transmission means for transmitting the power from the power source mounted on the vehicle to the axle, the rotation speed of the final gear (the rotation speed of the axle) fixed to the axle of the reduction gear train that constitutes a part of the power transmission means Various vehicle speed detection structures for detecting the vehicle speed by detecting the above are proposed.

  For example, there has been proposed a vehicle speed detection structure in which a detected portion is formed on the side surface of the final gear, and a vehicle speed sensor is provided from the outside of the final gear so that the detecting portion is close to and opposed to the detected portion (see Patent Document 1). .

International Publication WO2011 / 033614

  The vehicle disclosed in Patent Document 1 is a scooter type electric motorcycle, and a final gear of a reduction gear train constituting a part of power transmission means for transmitting power from the electric motor to the axle is fixed to the axle. A detected portion is provided near the tooth bottom on the outer surface of the final gear, and a vehicle speed sensor is provided on the outer side of the final gear so as to be close to and face the detected portion.

In the vehicle speed detection structure disclosed in Patent Document 1, the detected portion provided on the outer surface of the final gear is in a radial position near the tooth bottom of the tooth portion of the final gear, and the outer surface of the tooth portion and the detected surface are detected. The projecting end surface toward the outer side of the part is the same surface.
The vehicle speed sensor provided on the outer side of the final gear has its detection portion opposed to the protruding end surface of the detected portion on the outer surface of the final gear and passes through the detected portion as the final gear rotates. Is detected.

Since the detected portion is in a radial position close to the tooth bottom, forming a protruding end surface that is flush with the outer surface of the tooth portion, the detecting portion of the vehicle speed sensor is close to the tooth bottom.
For this reason, the vehicle speed sensor can easily detect the passage of the tooth portion (tooth bottom) in the vicinity of the detection portion as noise, and may reduce the detection accuracy of the vehicle speed sensor.

In addition, it is conceivable to form the detected portion on the axial center side in the radial direction so as to be separated from the tooth portion of the final gear. However, as disclosed in Patent Document 1, in the case of the final gear, the axle side is on the axle side. Since there is a large outer diameter, there is little room for the vehicle speed sensor to approach the axle side.
Therefore, it is sufficient to make the final gear itself have a large diameter, but the setting of the reduction ratio of the reduction gear train is changed, and the change is not easy, and the reduction gear is increased in size and weight. .

  The present invention has been made in view of the above points, and the object of the present invention is to secure a large degree of freedom in the position where the detected portion is provided and the mounting position of the vehicle speed sensor without increasing the diameter of the final gear. Further, the present invention is to provide a vehicle speed detection structure for a vehicle that can reduce noise caused by a tooth portion and improve detection accuracy.

In order to achieve the above object, the invention according to claim 1
The power transmission means (35, 38) for transmitting the power from the power source mounted on the vehicle to the axle (110) is housed in the transmission case (31L),
A final gear (100) of a reduction gear train (38) constituting a part of the power transmission means (35) is fixed to the axle (110),
The vehicle speed sensor (150) is configured such that the detection part (150s) of the vehicle speed sensor (150) is opposed in the axial direction to the detected part (105) provided integrally with one side surface in the axial direction of the final gear (100). In the vehicle speed detection structure of the vehicle attached to the transmission case (31L),
The detected portion (105) is formed to protrude in an axial direction from an axial one side surface (103a) of the axial one side surface of the tooth portion (103) of the final gear (100). It is the vehicle speed detection structure of the vehicle which does.

The invention according to claim 2
In the vehicle speed detection structure of the vehicle according to claim 1,
An extending portion (104) extends in the axial direction from the tooth portion (103), forming an extending side surface (104a) that is flush with the one axial side surface (103a) of the tooth portion (103). Formed,
The detected portion (105) is formed to protrude in the axial direction on the extended side surface (104a) of the extended portion (104).

The invention described in claim 3
In the vehicle speed detection structure of the vehicle according to claim 2,
The extension part (104) is formed in an annular shape over the entire circumference of the tooth part (103),
A plurality of the detected parts (105) are formed in the circumferential direction on an extended side surface (104a) formed in an annular shape of the extended part (104).

The invention according to claim 4
In the vehicle speed detection structure of the vehicle according to claim 2 or claim 3,
The final gear (100) has an annular connecting wall (102) connected between the shaft hole boss (101) through which the axle (110) is inserted and the tooth (103).
Both axial side surfaces of the annular connecting wall portion (102) are at axial positions between both axial side surfaces of the tooth portion (103),
The other axial side surface (103b) opposite to the one axial side surface (103a) of the tooth portion (103) passes through the stepped surface (103c) in the vicinity of the tooth bottom of the tooth portion (103), and the annular connecting wall Continuous to the other axial side surface (102b) of the portion (102),
The step surface (103c) is characterized in that a radial position from an axial center is within the width of the extended side surface (104a).

The invention according to claim 5
In the vehicle speed detection structure of the vehicle according to claim 4,
A protruding end surface (105a) of the detected portion (105) protruding in the axial direction from the extending portion (104) is an axial side surface (101a) on one axial side surface side of the axial hole boss portion (101). And the same plane.

The invention described in claim 6
In the vehicle speed detection structure of the vehicle according to claim 2 or claim 3,
The final gear (100) includes a shaft hole boss portion (101) through which the axle (110) is inserted,
The protruding end surface (105a) of the detected portion (105) protruding in the axial direction from the extending portion (104) is an axial side surface (101a) on the one axial side surface side of the axial hole boss portion (101). It is characterized by forming the same plane.

The invention described in claim 7
The vehicle speed detection structure for a vehicle according to any one of claims 1 to 6,
The power transmission case (31L) extends rearward from the internal combustion engine (30) as the power source, and the power transmission means (35, 38) including a continuously variable transmission (35) and the reduction gear train (38). ) Is mounted swingably on the saddle riding type vehicle (1), the swing type power unit (P) housed in the transmission case (31L),
An air cleaner device (25) is attached to the top of the transmission case (31L),
An outward projecting portion (150a) projecting outward from the transmission case (31L) in the vehicle speed sensor (150) is a continuously variable transmission that houses the continuously variable transmission (35) in the transmission case (31L) forward. It is characterized in that it is covered with a wall part (31Lc) of the machine accommodating chamber (70) and the upper part is covered with the air cleaner device (25).

The invention described in claim 8
In the vehicle speed detection structure of the vehicle according to claim 7,
The vehicle speed sensor (150) is attached to the side wall (31ca) of the transmission case (31L) with the upper end of the vehicle speed sensor (150) positioned below the upper wall surface (31Lcu) of the transmission case (31L). ,
The air cleaner device (25) is provided so as to bulge above the vehicle speed sensor (150) to the rear of the vehicle speed sensor (150).

The invention according to claim 9
In the vehicle speed detection structure for a vehicle according to claim 7 or claim 8,
The electrical coupler (151) attached to the outward protrusion (150a) of the vehicle speed sensor (150) is disposed inside the outer peripheral edge of the hub (20h) of the rear wheel (20) in a side view. It is characterized by.

The invention according to claim 10 is:
The vehicle speed detection structure for a vehicle according to any one of claims 7 to 9,
A sensor cover (160) covers at least an outer side, a rear side, and a lower side in the vehicle width direction of the outward protrusion (150a) of the vehicle speed sensor (150).

  According to the vehicle speed detection structure of the vehicle according to claim 1, the detected part (105) integrally formed on one side surface in the axial direction of the final gear (100) is provided on the tooth part (103) of the final gear (100). Since it is formed to protrude in the axial direction from the one side surface (103a) in the axial direction, the detection part (150s) of the vehicle speed sensor (150) facing the detected part (105) is axially extended from the tooth part (103). The vehicle speed sensor (150) is less likely to detect the tooth portion (103) when detecting the detected portion (105) accompanying the rotation of the final gear (100), and the tooth portion (103 ) Can be reduced and detection accuracy can be improved.

The protruding end face (105a) detected by the vehicle speed sensor (150) of the detected part (105) formed on the side surface of the final gear (100) is not separated from the tooth part (103) in the radial direction, but in the axial direction. Therefore, without increasing the diameter of the final gear (100), the degree of freedom of the position to install the detected part (105) and the mounting position of the vehicle speed sensor (150) that detects the detected part (105) is improved. Can be made.
Furthermore, since the detected portion (105) is integrally formed on one axial side surface (103a) of the final gear (100), the detected portion (105) can be provided as close as possible to the tooth portion (103).

  According to the vehicle speed detection structure for a vehicle according to claim 2, the extending side surface (104a) is flush with the axial side surface (103a) of the tooth portion (103) from the tooth portion (103) in the axial direction. An extension portion (104) is formed extending toward the extension portion, and the detection target portion (105) is formed by projecting in the axial direction on the extension side surface (104a) of the extension portion (104). The portion (104) is formed by extending the side surface from the highly rigid tooth portion (103) with the same plane, so that the final gear (100) including the detected portion (105) can be integrally formed by forging or the like. Easy to do.

  According to the vehicle speed detection structure for a vehicle according to claim 3, the extension part (104) is formed in an annular shape over the entire circumference of the tooth part (103), and the annular part of the extension part (104) is formed. Since a plurality of detected portions (105) are formed in the circumferential direction on the extending side surface (104a) formed in the rigidity of the extending portion (104), which is a portion where the detected portion (105) is formed to protrude. Can be effectively improved, and it becomes easier to form the detected portion (105).

According to the vehicle speed detection structure of the vehicle according to claim 4, the annular connecting wall portion (102) for connecting the shaft hole boss portion (101) and the tooth portion (103) of the final gear (100) has the shaft Both side surfaces are in the axial position between both axial surfaces of the tooth portion (103), and the other axial side surface (103b) of the tooth portion (103) is a step surface near the tooth bottom of the tooth portion (103) ( 103c) is continuous to the other axial side surface (102b) of the annular connecting wall (102), and the stepped surface (103c) has a radial position from the axial center within the width of the extended side surface (104a). The detected part (105) can be provided as close as possible to the tooth part of the final gear (100), and the degree of freedom of the mounting position of the vehicle speed sensor (150) can be further improved.
Further, the degree of freedom in setting the ratio of the final gear (100) can be increased.

  According to the vehicle speed detection structure for a vehicle according to claim 5 and claim 6, the protruding end surface (105a) of the detected portion (105) protruding in the axial direction from the extending portion (104) is the shaft hole boss portion (101). The axial hole boss part (101) and the detected part (105) are formed when the side surface of the final gear (100) is cut during molding of the final gear (100). Can be cut simultaneously and productivity can be improved.

  According to the vehicle speed detection structure of the vehicle according to claim 7, the transmission case (31L) extends rearward from the internal combustion engine (30), and the power consisting of the continuously variable transmission (35) and the reduction gear train (38). A swing type power unit (P) in which the transmission means (35, 38) is accommodated in the transmission case (31L) is swingably mounted on the saddle riding type vehicle (1), and the transmission case (31L in the vehicle speed sensor (150)) ) The outward projecting portion (150a) projecting outward is covered with the wall portion of the continuously variable transmission housing chamber that houses the continuously variable transmission in the transmission case, and the upper portion above the transmission case (31L). Since it is covered by the attached air cleaner device (25), the vehicle speed sensor (150) is efficiently arranged using the space behind the continuously variable transmission housing (70) of the transmission case (31L), and the vehicle speed sensor The front of (150) is covered with the wall (31Lc) of the continuously variable transmission housing (70) of the transmission case (31L), and the upper part of the vehicle speed sensor (150) is air-cleaned. Covered with Na device (25), a vehicle speed sensor (150) can be effectively protected from external factors.

  According to the vehicle speed detection structure of the vehicle according to claim 8, the upper end of the vehicle speed sensor (150) is positioned below the upper wall surface (31Lcu) of the transmission case (31L) and the side wall (31ca) of the transmission case (31L) is located. The air cleaner device (25) is provided so that the upper part of the vehicle speed sensor (150) bulges behind the vehicle speed sensor (150), so that the air cleaner device (25) moves the vehicle speed sensor (150) from the front upper side to the rear side. It can cover up and protect the vehicle speed sensor (150) more effectively, and can easily bulge the air cleaner device (25) backward without being obstructed by the vehicle speed sensor (150). The capacity of the device (25) can be increased.

  According to the vehicle speed detection structure of the vehicle according to claim 9, the electrical coupler (151) attached to the outward projecting portion of the vehicle speed sensor (150) is provided with the outer peripheral edge of the hub (20h) of the rear wheel (20) in a side view. Therefore, the rear wheel (20) side can be protected by the hub (20h) of the rear wheel (20) in the axial direction of the vehicle speed sensor (150) including the electrical coupler (151).

  According to the vehicle speed detection structure of the vehicle according to claim 10, at least the vehicle width direction outer side, the rear side, and the lower side of the outward projection (150a) of the vehicle speed sensor (150) are covered by the sensor cover (160). In addition to protecting the front and top of the outward protrusion of the vehicle speed sensor (150) by the case (31L) and the air cleaner device (25), at least the vehicle width direction of the outward protrusion of the vehicle speed sensor (150) by the sensor cover (160) The vehicle speed sensor (150) can be more effectively protected by the outer, rear and lower protection.

1 is an overall side view of a scooter type motorcycle according to an embodiment of the present invention. It is a side view of a power unit. It is a top view of the power unit. It is sectional drawing (IV-IV sectional view taken on the line of FIG. 2) of the power unit. It is a disassembled perspective view of the front part of a transmission case cover. It is a rear part expanded sectional view of a power unit. FIG. 6 is a rear sectional view of the power unit (a sectional view taken along line VII-VII in FIG. 2). It is a side view of a final gear. It is sectional drawing (IX-IX sectional view taken on the line of FIG. 6) of the final gear. It is the perspective view seen from the slanting back of a power unit.

Hereinafter, an embodiment according to the present invention will be described with reference to FIGS.
FIG. 1 is a side view of a scooter type motorcycle 1 according to an embodiment to which the present invention is applied.
In the present embodiment, the front, rear, left and right are determined based on the state in which the scooter type motorcycle 1 faces the forward direction.

The vehicle body front portion 1F and the vehicle body rear portion 1R are connected via a low floor portion 1C, and the vehicle body frame forming the skeleton of the vehicle body is generally composed of a down frame 3 and a main frame 4.
That is, the down frame 3 extends downward from the head pipe 2 of the vehicle body front portion 1F, the down frame 3 bends horizontally at the lower end and extends rearward below the floor portion 1C, and a pair of left and right main frames 4 at the rear end. Are connected via a connecting member 4a, and the main frame 4 rises obliquely rearward from the connecting member 4a, bends horizontally at a predetermined height, and extends rearward.

A fuel tank 28 and a storage box 29 are supported by the main frame 4, and a seat 5 is disposed above them.
The seat 5 is long in the front-rear direction, and the rear of the driver seat 5f in the front half is a passenger seat 5r.

On the other hand, in the vehicle body front portion 1F, a handle 6 is provided on the upper side of the head pipe 2 and a front fork 7 extends downward, and a front wheel 8 is supported on the lower end thereof.
A swing type power unit P is swingably connected to and supported by a connecting member 4 a at the lower end of the rising portion of the main frame 4 via a link member 9.

  In the power unit P, a single-cylinder four-stroke cycle internal combustion engine 30 is mounted at the front of the power unit P in a posture in which the cylinder block 32 is largely tilted to a substantially horizontal state. The end of the hanger bracket 31h protruding forward from the lower end of the corresponding portion is connected to the link member 9 via the pivot shaft 9a (see FIG. 1).

A belt-type continuously variable transmission 35 is configured from the left half of the internal combustion engine 30 to the rear, and the rear wheel 20 is pivotally supported by a speed reduction mechanism 38 provided at the rear thereof.
A rear cushion 21 is interposed between the rear portion of the upper wall of the unit case 31 and the rear portion of the main frame 4 above it.

  Above the power unit P, an intake pipe 22 extends from the upper part of the cylinder head 33 which is largely inclined forward of the internal combustion engine 30, and a connecting tube 24 is connected to the intake pipe 22 which is curved rearward with a throttle body 23 interposed. The air cleaner device 25 is connected to the connecting tube 24 extending rearward, and the air cleaner device 25 is attached to the upper part of the unit case 31 (see FIGS. 2 and 3).

Referring to FIG. 1, front and rear of vehicle body front portion 1F is covered by front cover 11f and leg shield 11r, left and right sides are covered by front lower cover 11c, and the center portion of handle 6 is covered by handle cover 11h.
A front fender 10 covers the front wheel 8.

A step plate 12 is stretched over the floor portion 1C, and the step plate 12 slightly rises before and after the floor step portion that is spread horizontally on the floor portion 1C.
A lower side cover 13 extends downward along the left and right edges of the step plate 12.
The lower side cover 13 covers a side of the cylinder block 32 and the cylinder head 33 of the internal combustion engine 30 with a lower side cover rear portion 13r extending obliquely upward rearward from the floor portion 1C.

The vehicle body rear portion 1R has a body cover 14b connected to an upper end edge of the lower side cover rear portion 13r extending obliquely upward of the lower side cover 13, covering the left and right sides of the main frame 7, and both the left and right body covers 14b, 14b. A maintenance lid 14f bulging forward by connecting the front end edges covers the front of the cylinder head cover 34 and the storage box 29, and tail lights 14r are provided at both rear end edges of the left and right body covers 14b, 14b.
A rear fender 15 provided below the taillight 14r extends obliquely downward and covers the rear wheel 20 from above.

  A main stand 16 is pivotally attached to a bracket 31k projecting behind a hanger bracket 31h at the bottom of the unit case 31, and leftward from a connecting member 4a between the down frame 3 and the main frame 4 in the floor portion 1C. A side stand 17 is pivotally attached to a support bracket 17b penetrating the lower side cover 13.

  2 and 3, support stays 4s and 4s extend obliquely from left and right outward to the rear from the front inclined portions of the left and right main frames 4 and 4, and the rear ends of the respective support stays 4s. A support bracket 18b provided on the lower side cover 13 is positioned along an inclined lower edge 13re of the rear side cover 13r extending obliquely upward of the lower side cover 13, and a pillion step 18 is pivotally attached to the support bracket 18b. ing.

As shown in FIG. 2, the pillion step 18 lies down along the inclined lower edge 13re of the rear side cover 13r, swings so as to protrude outward, and stands up in the horizontal direction. The passenger's foot seated on the seat 5r is supported.
The pillion step 18 is located in the vicinity of the upper part of the front portion of the belt type continuously variable transmission 35 of the power unit P.

FIG. 4 is a cross-sectional view of the power unit P which is cut along the line IV-IV in FIG. 2 and developed.
The unit case 31 is configured by combining a left unit case 31L and a right unit case 31R which are divided into left and right parts. The right unit case 31R forms a half of the crankcase part, and the left unit case 31L includes front and rear parts. It is composed of a long crankcase portion 31a at the front, a transmission case portion 31b at the center, and a reducer case portion 31c at the rear.

  The left open surface of the left unit case 31L is covered with a transmission case cover 36 which is a part of the transmission case, the belt type continuously variable transmission 35 is accommodated therein, and the right open surface of the rear reduction gear case 31c. Is covered with a reduction gear case 37 which is a part of the transmission case, and a reduction mechanism (reduction gear train) 38 is accommodated therein.

  In the so-called crankcase of the crankcase portion 31a and the right unit case 31R, the crankshaft 40 is rotatably supported by the left and right main bearings 41, 41, and the right extension of the extension portions extending in the left-right horizontal direction is provided. An AC generator 60 is provided in the part, and a cam chain drive sprocket 55 and a belt drive pulley 76 of the belt type continuously variable transmission 35 are provided in the left extension part.

In the internal combustion engine 30, a connecting rod 43 connects a piston 42 that reciprocates in a cylinder liner 44 of a cylinder block 32 and a crank pin 40 a of a crankshaft 40.
The four-cycle internal combustion engine 30 employs an SOHC type valve system. A valve mechanism 50 is provided in the cylinder head cover 34, and a cam chain 51 that transmits drive to the valve mechanism 50 includes a camshaft 53. The cam chain chamber 52 is provided in communication with the crankcase portion 31a, the cylinder block 32, and the cylinder head 33.

That is, the cam chain 51 passes through the cam chain chamber 52 between the driven sprocket 54 fitted to the left end of the camshaft 53 oriented in the horizontal direction and the drive sprocket 55 fitted to the crankshaft 40. It is being transported.
In the cylinder head 33, an ignition plug 45 is fitted obliquely from the opposite side (right side) of the cam chain chamber 52 toward the combustion chamber.

  The AC generator 60 provided on the right side surface of the right unit case 31R has a bowl-shaped outer rotor 62 fixed to the end of the crankshaft 30 protruding from the central cylindrical portion 31d of the right unit case 31R via an ACG boss 61. A stator 64 around which a stator coil 65 is wound is fixed to the central cylindrical portion 31d inside a magnet 63 disposed on the inner peripheral surface in the circumferential direction.

A forced air cooling fan 66 is attached to the right side surface of the outer rotor 62, a fan cover 67 covers the side of the fan rotor 67, and a shroud 68 connected to the fan cover 67 to cover the periphery of the cylinder block 32 and the cylinder head 33 is provided.
A cooling air passage 68p that guides cooling air from the forced air cooling fan 66 to the cylinder head 33 is formed inside the curved shroud 68 on the right side by an inner wall 68i.

  In the crankcase portion 31a of the unit case 31, the cam chain chamber 52 is formed so as to be separated from the crank chamber by a main bearing 41, and the left side wall of the cam chain chamber 52 is further provided with a belt type continuously variable transmission on the left side. A partition wall 71 that partitions the machine chamber 70 and the cam chain chamber 52. A seal member 72 is press-fitted into a circular opening through which the crankshaft 40 penetrates the partition wall 71, and the hollow portion of the annular seal member 72 is connected to the crankshaft. 40 penetrates.

The drive sprocket 55 is fitted on the crankshaft 40 between the seal member 72 and the main bearing 41, and the cam chain 51 is wound around the drive sprocket 55.
This seal member 72 partitions the belt-type continuously variable transmission chamber 70 from the cam chain chamber 52 in a liquid-tight manner to prevent oil from leaking into the belt-type continuously variable transmission chamber 70.
The crankshaft 40 extending through the seal member 72 is rotatably provided with a belt driving pulley 76 as a unit.

  The belt drive pulley 76 is composed of a fixed pulley half 77 and a movable pulley half 78, and the fixed pulley half 77 is fixed to the left end of the crankshaft 40 via a ratchet member 79, and on the right side thereof. The movable pulley half 78 is spline-fitted to the crankshaft 40, and the movable pulley half 78 rotates with the crankshaft 40 and slides in the axial direction to approach and separate from the fixed pulley half 77. The V belt 75 is sandwiched between the pulley halves 77 and 78 and wound.

A cam plate 80 is provided at a fixed position near the annular seal member 72 on the right side of the movable pulley half 78, and a slide piece 80a provided at the outer peripheral end of the cam plate 80 is provided at the outer peripheral end of the movable pulley half 78. A sliding groove 78a formed in the axial direction is slidably engaged.
The side surface of the movable pulley half 78 on the cam plate 80 side is tapered toward the cam plate 80 side, and a dry weight roller 81 is accommodated between the cam plate 80 inside the tapered surface.

  Accordingly, when the rotational speed of the crankshaft 40 increases, the dry weight roller 81 that rotates between the movable pulley half 78 and the cam plate 80 moves in the centrifugal direction due to centrifugal force, and the movable pulley half 78 moves in the same direction. It is pressed by the weight roller 81 and moves to the left to approach the stationary pulley half 77 and moves the V belt 75 sandwiched between the pulley halves 77 and 78 in the centrifugal direction to increase the winding diameter. It is configured as follows.

The rear belt driven pulley 86 corresponding to the belt driving pulley 76 is fixed to a fixed pulley half on an inner sleeve 89 supported so as to be rotatable relative to the speed reducer input shaft 95 of the speed reducing mechanism 38 with reference to FIG. A movable pulley half 88 is fitted to an outer sleeve 90 that is fitted and supported on the left side of the fixed pulley half 87 on the left side of the inner sleeve 89 so as to be relatively movable. It consists of 87 and 88.
A guide pin 89p projecting from the inner sleeve 89 is slidably fitted into a spiral long hole 90h of the outer sleeve 90 to constitute a torque cam mechanism.
The V belt 75 is sandwiched between the pulley halves 87 and 88.

A centrifugal clutch 91 is provided on the left side of the reduction gear input shaft 95 and the inner sleeve 89.
In the centrifugal clutch 91, a clutch outer 93 that covers the outer periphery of the clutch inner 92 that is fitted to the inner sleeve 89 is fitted to the reduction gear input shaft 95, and the clutch inner 92 swings in the centrifugal direction against the spring 92b. A moving clutch shoe 92 s is provided to face the inner peripheral surface of the clutch outer 93.

  Therefore, when the rotational speed of the power transmitted to the inner sleeve 89 via the V-belt 75 increases, the clutch shoe 92s swings in the centrifugal direction against the spring 92b and moves to the inner peripheral surface of the clutch outer 93. Then, the centrifugal clutch 91 is engaged and transmitted to the reduction gear input shaft 95.

The reduction gear input shaft 95 is pivotally supported by the transmission case cover 36 and the transmission case 31L via bearings 96, 96, passes through the transmission case 31L to the right, and has a reduction gear input tooth 95t formed at the right end thereof. .
The intermediate shaft 98 is pivotally supported by the transmission case 31L and the reduction gear case 37 via bearings 99, 99 behind the reduction gear input teeth 95t, and the intermediate gear 97 spline-fitted to the intermediate shaft 98 is input to the reduction gear. It meshes with the tooth 95t.

The intermediate shaft 98 is formed with small-diameter intermediate teeth 98t, and a rear axle 110 is supported on the transmission case 31L and the reduction gear case 37 via bearings 111 and 111 further behind the intermediate shaft 98. A rear wheel 20w is fitted to the right end of the axle 110 that passes through the reduction gear case 37 and protrudes to the right, and the rear wheel 20 is attached.
Thereafter, the final gear 100 fitted on the axle 110 meshes with the small-diameter intermediate teeth 98t of the intermediate shaft 98.

  The speed reduction mechanism 38 configured in this manner uses the power transmitted to the speed reducer input shaft 95 from the meshing of the speed reducer input teeth 95t and the intermediate gear 97 via the intermediate shaft 98 and the meshing of the intermediate teeth 98t and the final gear 100. The reduction gear train is decelerated and transmitted to the final gear 100, that is, the rear axle 110 to rotate the rear wheel 20.

The transmission case cover 36 that covers the belt-type continuously variable transmission chamber 70 from the left side has a long oval shape in front and rear in a side view (see FIG. 2), and as shown in FIG. Covers from 76 to the rear centrifugal clutch 91, and the kick shaft 26 is pivotally supported so as to be slightly forward from the center. A drive helical gear 120 is fitted to the inner end of the kick shaft 26. The return spring 121 is biased.
The base end of the kick arm 28 is fitted to the left end portion protruding to the outside of the kick shaft 27, and the kick pedal 27p is attached to the tip end of the kick arm 27 so as to be raised and lowered.

A sliding shaft 122 is supported on the inner surface of the front portion of the transmission case cover 36 coaxially with the crankshaft 40 so as to be rotatable and slidable in the axial direction. A driven helical gear 123 is formed on the sliding shaft 122. The ratchet wheel 124 is fixed to the right end and is biased to the left by the friction spring 125.
On the other hand, the ratchet member 79 fixed to the crankshaft 40 by pressing the fixed pulley half 77 is formed with a ratchet facing the ratchet wheel 124, and both can be brought into contact with and separated from each other by sliding of the slide shaft 122. It is.

  Therefore, when the kick pedal 27p is depressed and the kick shaft 26 rotates against the return spring 125, the driving helical gear 120 rotates together with the kick shaft 26, and the driven helical gear 123 meshing with the kick helical shaft 26 is integrated with the sliding shaft 122. The ratchet wheel 124 meshes with the ratchet of the ratchet member 79 while rotating to the right against the friction spring 125, and the crankshaft 40 can be forcibly rotated to start the internal combustion engine 30.

  The fixed pulley half 77 has a cooling fan 77f formed on the side (left side) opposite to the side that holds the V-belt 75, and the cooling fan of the fixed pulley half 77 that rotates together with the crankshaft 40. The outside air is introduced into the belt-type continuously variable transmission chamber 70 by the rotation of 77f, and the belt-type continuously variable transmission 35 is cooled.

The transmission case cover 36 is generally composed of an oval side wall covering the left side of the belt-type continuously variable transmission 35 and a peripheral wall surrounding the outer periphery, and as shown in FIG. A fan-shaped side wall that is continuously concaved rightward in a U-shape around the central axis Z of the crankshaft 40 from the upper side of the central axis Z through the front and rearward. The portion 36a is further recessed to the right.
The fan-shaped side wall portion 36a has an inclined surface that gradually approaches the inner side in the axial direction from the rear to the front, and two case air inlets 36ah and 36ah that are largely opened up and down are formed in the center.
The case air inlets 36ah, 36ah face the cooling fan 77f of the stationary pulley half 77 (see FIG. 4).

The inner dust cover 130 is fitted to the fan-shaped side wall portion 36a of the transmission case cover 36 from the left side through an annular seal member 135 disposed so as to surround the case air inlets 36ah and 36ah. The outer dust cover 131 is covered from the left side so as to correspond to the U-shaped concave portion of the front portion of the fitted inner dust cover 130 and transmission case cover 36.
The inner dust cover 130 has one large inner cover air inlet 130h corresponding to both the case air inlets 36ah and 36ah of the transmission case cover 36, and the air guide ribs 130r along the periphery of the inner cover air inlet 130h. Is formed to protrude to the left side except for the upper portion.
In the inner dust cover 130, a bulging wall 130e that bulges above the defective portion on the upper side of the air guide rib 130r forms an outside air intake space 133 inside.

  The outer dust cover 131 covers the air guide rib 130r of the inner dust cover 130 via the seal member 136, covers the bulging wall 130e, and the upper and lower sides of the U-shaped portion of the transmission case cover 36. Is covered with the inner dust cover 130 together with the two bolts 137 and 137 together with the transmission case cover 36.

The outer dust cover 131 also has a bulging wall 131e that bulges upward and covers the bulging wall 130e of the inner dust cover 130, and an outside air inlet 131h is formed on the left side wall of the bulging wall 131e.
The fan-shaped side wall portion 131 a of the outer dust cover 131 corresponding to the fan-shaped side wall portion 36 a forming the inclined surface of the transmission case cover 36 is parallel to the fan-shaped side wall portion 36 a of the transmission case cover 36, and thus the fan-shaped side wall portion of the transmission case cover 36. 131a forms an inclined surface that gradually approaches the inner side in the axial direction from the rear to the front (see FIGS. 3 and 4).

Thus, when the inner dust cover 130 and the outer dust cover 131 are attached to the front part of the transmission case cover 36, the bulging wall 130e of the inner dust cover 130 and the outer dust cover 131 that bulge upward from the transmission case cover 36 are provided. The bulging wall 131e is fitted to form an outside air intake space 133 communicating with the outside air intake port 131h, and the fan-shaped side wall portion 36a of the transmission case cover 36 and the outer dust cover 131 are inclined and parallel to each other. An air guide path 134 is formed between the fan-shaped side wall portion 131a and the air guide ribs 130r of the inner dust cover 130.
The air guide path 134 communicates the outside air intake space 133 with the inner cover air inlet 130h (and the case air inlets 36ah, 36ah).

When the crankshaft 40 is rotated by the drive of the internal combustion engine 30 and the cooling fan 77f of the stationary pulley half 77 is integrally rotated, outside air is taken into the outside air intake space 133 from the outside air intake port 131h, and the outside air is introduced by the air guide path 134. It is led from the intake space 133 to the inner cover air inlet 130h (and the case air inlets 36ah, 36ah), and is sucked into the belt type continuously variable transmission chamber 70 from the case air inlets 36ah, 36ah. Cooling.
A cylindrical case exhaust duct 36d is formed in a slanting vertical direction along the inner surface of the side wall at a substantially central position in the front-rear direction of the transmission case cover 36 (see the broken line in FIG. 2 and FIG. 4), and its upper end opening. Is open to the indoor side and the lower end opening is open to the outdoor side, and the air that has cooled the belt-type continuously variable transmission 35 is discharged outside the case exhaust duct 36d.

  As shown in FIG. 2, the front part of the transmission case cover 36 that covers the belt-type continuously variable transmission 35 from the left outer side is below the pillion step 18 arranged along the inclined lower edge 13re of the side cover rear part 13r. Conventionally, the position of the pillion step is such that the outer dust cover 131 at the front of the transmission case cover 36 does not interfere with the base end of the pillion step 18 when the swing type unit case 31 swings upward. However, as shown in the top view of FIG. 3, the outer dust cover 131 avoids the support bracket 18 b at the base end of the pillion step 18. Since the fan-shaped side wall portion 131a has an inclined surface that gradually approaches the inner side in the axial direction from the rear to the front, it is easy to avoid interference with the support bracket 18b, and the pillion It is possible to improve the degree of freedom of the arrangement of the flop.

The power unit P of the scooter type motorcycle 1 detects the rotational speed of the final gear 100 in a speed reduction mechanism (deceleration gear train) 38 that rotates integrally with the rear axle 110 in order to detect the vehicle speed from the rotational speed of the rear wheel 20. 150 has detected.
7 and 8, the final gear 100 is a helical gear in which an annular connecting wall portion 102 is connected between a shaft hole boss portion 101 through which a rear axle 110 is inserted and a tooth portion 103. The axially opposite side surfaces 102a and 102b of the connecting wall portion 102 are in the axial position between the axially opposite side surfaces 103a and 103b of the tooth portion 103, and the axial width (thickness) of the annular connecting wall portion 102 is toothed. It is smaller than the axial width of the portion 103 and smaller than the axial width of the axial hole boss portion 101.

An extending side 104a extending in the axial direction from the tooth 103 is formed in an annular shape by forming an extended side surface 104a that is flush with the axial left side surface 103a of the tooth 103. On the extended side surface 104a formed in an annular shape of the extended portion 104, a plurality of detected portions 105 are formed protruding at equal intervals in the circumferential direction.
In this embodiment, 20 detected parts 105 are provided, but it is needless to say that the number is not necessarily limited to this number.
That is, the detected portion 105 protrudes in the axial direction from the tooth portion 103 (the left side surface 103a in the axial direction).

The extending portion 104 is formed by extending in the axial direction from the highly rigid tooth portion 103 with the side surface being the same plane, so that it is easy to integrally form the final gear 100 including the detected portion 105 by forging or the like. it can.
Since a plurality of detected portions 105 are formed at equal intervals in the circumferential direction on the extended side surface 104a formed in an annular shape of the extended portion 104, the extended portion which is a portion where the detected portion 105 is formed to protrude. The rigidity of 104 can be effectively improved, and it becomes easier to form the detected portion (105).

The projecting end surfaces 105a of the plurality of detected portions 105 projecting from the annular extending portion 104 are flush with the axial left side surface 101a of the shaft hole boss portion 101.
Therefore, when the side surface of the final gear 100 is cut during molding of the final gear 100, the shaft hole boss portion 101 and the detected portion 105 can be cut simultaneously, and productivity can be improved.

On the right side surface of the final gear 100, the other axial side surface 103b of the tooth portion 103 is continuous with the other axial side surface 102b of the annular connecting wall portion 102 through the step surface 103c near the tooth bottom of the tooth portion 103. The detected portion 105 on the left side surface of 100 has substantially the same radial position from the axis as the stepped surface 103c near the tooth bottom of the tooth portion 103 on the right side surface of the final gear 100 (see FIG. 8).
Further, the stepped surface 103c has a radial position from the axial center within the width of the extending portion (extending side surface 104a) (see FIG. 8).

  The final gear 100 as described above is integrally fitted to the rear axle 110 and incorporated in the reduction mechanism (reduction gear train) 38, and is formed by a reduction gear case portion 31c and a reduction gear case 37 at the rear of the left unit case 31L. Is accommodated in the reducer chamber (see FIG. 5).

Referring to FIGS. 5 and 9, a vehicle speed sensor 150 is fitted to the side wall 31ca of the reducer case portion 31c at the rear of the left unit case 31L covering the left side of the final gear 100 from the left outside so that the side wall 31ca is inserted. Installed through.
The detection portion 150s at the tip of the vehicle speed sensor 150 penetrating through the side wall 31ca is formed to project from the extended side surface 104a and the extended side surface 104a of the annular extended portion 104 on the left side in the axial direction of the final gear 100. It faces the protruding end surface 105a of the portion 105 and is close to the protruding end surface 105a of the detected portion 105.

The vehicle speed sensor 150 is a magnetic sensor, and detects the vehicle speed from the rotational speed of the final gear 100 by detecting the passage of the detected part 105 turning with the rotation of the final gear 100 by the detection unit 150s.
The detection unit 150s of the vehicle speed sensor 150 proximate to the protruding end surface 105a of the detected portion 105 protruding in the axial direction from the axial left side surface 103a of the tooth portion 103 is separated from the tooth portion 103 in the axial direction. When detecting the passage of the detected part 105 due to the rotation of 100, the possibility of detecting the passage of the tooth part 103 is low, and noise caused by the tooth part 103, particularly the tooth bottom, can be reduced to improve the detection accuracy. it can.

  The detected portion 105 formed on the left side surface of the final gear 100 detected by the vehicle speed sensor 150 is not separated from the tooth portion 103 in the radial direction but in the axial direction, so that the diameter of the final gear 100 is not increased. The degree of freedom of the position where the detected portion 105 is provided and the mounting position of the vehicle speed sensor 100 that detects the detected portion 105 can be improved.

In the present embodiment, the mating surface of the speed reducer case portion 31c and the speed reducer case 37 is positioned so as to overlap with the tooth portion 103 of the final gear 100 in the axial direction (see FIGS. 5 and 9). It is difficult to adopt a vehicle speed sensor mounting structure that detects the passage of the tooth portion 103 in the outer periphery of the tooth portion 103.
Therefore, the present invention can be particularly preferably adopted in a vehicle having such a case mating surface structure.
In other words, according to the present invention, it is possible to increase the degree of freedom in setting the mating surface position between the reduction gear case 31c and the reduction gear case 37.

On the other hand, the detected portion 105 is formed integrally with the left side surface of the final gear 100, so that the stepped surface 103c near the tooth bottom of the tooth portion 103 on the right side surface of the final gear 100 and the radial direction from the axis. Since the positions can be formed at positions that are substantially equal, that is, as close as possible to the tooth bottom of the tooth portion 103, the degree of freedom of the mounting position of the vehicle speed sensor 150 is further improved, and the position that does not interfere with the bearing 111 of the axle 110, etc. The vehicle speed sensor 150 can be easily provided.
Further, the degree of freedom in setting the ratio of the final gear 100 can be increased.

The vehicle speed sensor 150, which is attached through the side wall 31ca of the speed reducer case portion 31c, is located on the upper side of the bearing 111 of the axle 110 and is slightly rearward of the slant, and the peripheral wall of the speed reducer case portion 31c covering the periphery of the final gear 100 It is attached to the inner side of 31Lcc (a peripheral wall further extending behind the peripheral wall 31Lc of the left unit case 31L) (see FIGS. 2 and 3).
Therefore, the upper end of the vehicle speed sensor 150, that is, the upper end of the electrical coupler 151 is located below the upper wall surface 31Lcu in the peripheral wall 31Lc surrounding the outer periphery of the belt-type continuously variable transmission 35 of the left unit case 31L as a transmission case.

The air cleaner device 25 disposed above the belt-type continuously variable transmission 35 is fixedly supported by a bolt 39 on the upper wall surface 31Lcu of the peripheral wall 31Lc of the left unit case 31L, and the vehicle speed sensor 150 is supported by the left unit case. Since the air cleaner device 25 is located below the upper wall surface 31Lcu of 31L, the rear of the air cleaner device 25 avoids the rear cushion 21 on the left side and bulges upward from the vehicle speed sensor 150 without interfering with the vehicle speed sensor 150. (See FIGS. 2 and 10).
The air cleaner device 25 can be expanded rearward without being obstructed by the vehicle speed sensor 150, and the capacity of the air cleaner device 25 can be increased.

  In the vehicle speed sensor 150, an outward protruding portion 150a opposite to the detecting portion 150s protruding inward of the reduction gear case portion 31c protrudes outward from the side wall 31ca of the reduction gear case portion 31c. An electrical coupler 151 is attached.

  Referring to FIGS. 3 and 5, the outward projection 150a of the vehicle speed sensor 150 and the front of the electric coupler 151 surround the outer periphery of the belt type continuously variable transmission 35 in the transmission case 31b at the center of the left unit case 31L. Since the peripheral wall 31Lc covers the upper part of the vehicle speed sensor 150 and the air cleaner device 25 covers the space, the space behind the peripheral wall 31Lc of the left unit case 31L, which is a transmission case for housing the belt-type continuously variable transmission 35, is provided. The vehicle speed sensor 150 is efficiently disposed using the vehicle, while the front of the vehicle speed sensor 150 is covered with the peripheral wall 31Lc of the left unit case 31L, the upper part of the vehicle speed sensor 150 is covered with the air cleaner device 25, and the vehicle speed sensor 150 is It is possible to effectively protect against external factors such as a key member such as a U-shaped lock attached to the wheel 20w.

Further, as shown in FIG. 2, the upper end of the electrical coupler 151 attached to the outward projecting portion 150a of the vehicle speed sensor 150 is arranged inside the outer peripheral edge of the hub 20h of the rear wheel 20w in the rear wheel 20 as viewed from the side. Established.
Therefore, the rear wheel side (right side) in the axial direction of the vehicle speed sensor 150 including the electrical coupler 151 can be protected by the hub 20h of the rear wheel 20.

A sensor cover 160 is placed over the outward projecting portion 150a of the vehicle speed sensor 150 and the electrical coupler 151 projecting leftward from the side wall 31ca of the speed reducer case portion 31c.
A wiring cord 152 extends upward from the electrical coupler 151, curves while moving toward the right side, and extends forward along the upper wall surface 31Lcu of the left unit case 31L.
The sensor cover 160 is integrally formed with an outward projecting portion 150a of the vehicle speed sensor 150, a sensor cover main portion 161 that covers the electrical coupler 151, and a long cord cover portion 162 that covers the wiring cord 152 (see FIG. 10).

  Referring to FIGS. 9 and 10, the sensor cover main portion 161 includes an outer protrusion 150a of the vehicle speed sensor 150 and an outer side (left side) of the electrical coupler 151 in the vehicle width direction on the left side wall 161a and an upper side on the upper wall 161b. The rear wall 161c and the lower wall 161d are covered at the rear, and the upper wall 161b and the rear wall 161c are extended rightward on the peripheral wall 31Lc of the reduction gear case portion 31c around the final gear 100. The portion that curves forward while facing the right side of the wiring cord 152 extending upward from the electrical coupler 151 is covered, and the right side wall 161e covers the right side thereof.

  The cord cover portion 162 is a long member having a U-shaped cross section that opens downward, and the right side of the lower end portion of the rear cushion 21 extends forward from the corner portions of the upper wall 161b and the right side wall 161e of the sensor cover main portion 161. It extends along the upper wall surface 31Lcu of the left unit case 31L and surrounds the wiring cord 152 extending forward from the inside of the sensor cover main part 161 from above, and is positioned and wired at a predetermined position on the upper wall surface 31Lcu of the left unit case 31L. (See FIG. 10).

  The sensor cover 160 is placed on the upper wall surface 31Lcu of the left unit case 31L, and a bracket 161ab protruding forward from the left side wall 161a of the sensor cover main part 161 has a side wall 31ca of the speed reducer case part 31c by a bolt 165 from the outside in the vehicle width direction. The center portion of the cord cover 162 in the front-rear direction is fixed to the support bracket 31bb protruding from the outer side in the vehicle width direction with the bolt 166 to the upper side of the transmission case portion 31b of the left unit case 31L. (See FIGS. 2 and 5).

  As described above, the outward projecting portion 150a of the vehicle speed sensor 150, together with the electrical coupler 151, is covered with the side wall 31ca of the reducer case portion 31c and the hub 20h of the rear wheel 20w, and the front is the left unit case 31L. The upper part is covered with an air cleaner device 25, and the upper part is covered with an air cleaner device 25 for effective protection, and the left side, lower part, and rear part are covered with the sensor cover main part 161 of the sensor cover 160 and stepping stones and U-shapes. More effective protection from external factors such as locks.

  The sensor cover 160 is fixed to the left unit case 31L with two bolts 165 and 166, so that the sensor cover main part 161 covers the outward projecting portion 150a of the vehicle speed sensor 150 and the electrical coupler 151, and at the same time, the cord cover The wiring cord 152 extending from the electrical coupler 151 and extending forward by the portion 162 can be positioned and wired at a predetermined position, and the assembling work is simplified.

DESCRIPTION OF SYMBOLS 1 ... Scooter type motorcycle, 3 ... Down frame, 4 ... Main frame, 8 ... Front wheel, 20 ... Rear wheel, 20h ... Hub, 21 ... Rear cushion, 25 ... Air cleaner device,
P ... Power unit, 30 ... Internal combustion engine, 31 ... Unit case, 31L ... Left unit case, 31Lcu ... Upper wall surface, 31Lc ... Peripheral wall, 35 ... Belt type continuously variable transmission, 36 ... Transmission case cover, 37 ... Reduction gear case, 38 ... Deceleration mechanism (deceleration gear train), 40 ... Crankshaft, 70 ... Belt type continuously variable transmission chamber, 75 ... V belt, 76 ... Belt drive pulley, 86 ... Belt driven pulley, 91 ... Centrifugal clutch, 95 ... Deceleration Machine input shaft, 97 ... intermediate gear, 98 ... intermediate shaft,
DESCRIPTION OF SYMBOLS 100 ... Final gear, 101 ... Shaft hole boss | hub part, 102 ... Annular connection wall part, 103 ... Tooth part, 104 ... Extension part, 105 ... Detected part, 110 ... Rear axle, 111 ... Bearing,
150: vehicle speed sensor, 150s: detection unit, 150a: outward projection, 151: electrical coupler, 152: wiring cord, 160: sensor cover, 161: sensor cover main part, 162: code cover unit

Claims (10)

The power transmission means (35, 38) for transmitting the power from the power source mounted on the vehicle to the axle (110) is housed in the transmission case (31L),
A final gear (100) of a reduction gear train (38) constituting a part of the power transmission means (35) is fixed to the axle (110),
The vehicle speed sensor (150) is configured such that the detection part (150s) of the vehicle speed sensor (150) is opposed in the axial direction to the detected part (105) provided integrally with one side surface in the axial direction of the final gear (100). In the vehicle speed detection structure of the vehicle attached to the transmission case (31L),
The detected portion (105) is formed to protrude in an axial direction from an axial one side surface (103a) of the axial one side surface of the tooth portion (103) of the final gear (100). A vehicle speed detection structure for a vehicle to be operated. An extending portion (104) extends in the axial direction from the tooth portion (103), forming an extending side surface (104a) that is flush with the one axial side surface (103a) of the tooth portion (103). Formed,
The vehicle speed detection structure for a vehicle according to claim 1, wherein the detected portion (105) is formed to protrude in the axial direction on the extended side surface (104a) of the extended portion (104). The extension part (104) is formed in an annular shape over the entire circumference of the tooth part (103),
The vehicle speed according to claim 2, wherein a plurality of the detected parts (105) are formed in a circumferential direction on an extended side surface (104a) formed in an annular shape of the extended part (104). Detection structure. The final gear (100) has an annular connecting wall (102) connected between the shaft hole boss (101) through which the axle (110) is inserted and the tooth (103).
Both axial side surfaces of the annular connecting wall portion (102) are at axial positions between both axial side surfaces of the tooth portion (103),
The other axial side surface (103b) opposite to the one axial side surface (103a) of the tooth portion (103) passes through the stepped surface (103c) in the vicinity of the tooth bottom of the tooth portion (103), and the annular connecting wall Continuous to the other axial side surface (102b) of the portion (102),
4. The vehicle speed detection structure for a vehicle according to claim 2, wherein the stepped surface (103c) has a radial position from an axial center within the width of the extended side surface (104a).   A protruding end surface (105a) of the detected portion (105) protruding in the axial direction from the extending portion (104) is an axial side surface (101a) on one axial side surface side of the axial hole boss portion (101). The vehicle speed detection structure for a vehicle according to claim 4, wherein the vehicle speed detection structure is coplanar with the vehicle. The final gear (100) includes a shaft hole boss portion (101) through which the axle (110) is inserted,
The protruding end surface (105a) of the detected portion (105) protruding in the axial direction from the extending portion (104) is an axial side surface (101a) on the one axial side surface side of the axial hole boss portion (101). 4. The vehicle speed detection structure for a vehicle according to claim 2, wherein the vehicle speed detection structure is formed in the same plane. The power transmission case (31L) extends rearward from the internal combustion engine (30) as the power source, and the power transmission means (35, 38) including a continuously variable transmission (35) and the reduction gear train (38). ) Is mounted swingably on the saddle riding type vehicle (1), the swing type power unit (P) housed in the transmission case (31L),
An air cleaner device (25) is attached to the top of the transmission case (31L),
An outward projecting portion (150a) projecting outward from the transmission case (31L) in the vehicle speed sensor (150) is a continuously variable transmission that houses the continuously variable transmission (35) in the transmission case (31L) forward. The vehicle speed detection of a vehicle according to any one of claims 1 to 6, wherein the vehicle is covered with a wall portion (31bc) of the machine accommodation chamber (70) and the upper portion is covered with the air cleaner device (25). Construction. The vehicle speed sensor (150) is attached to the side wall (31ca) of the transmission case (31L) with the upper end of the vehicle speed sensor (150) positioned below the upper wall surface (31Lcu) of the transmission case (31L). ,
8. The vehicle speed detection structure for a vehicle according to claim 7, wherein the air cleaner device (25) is provided so as to bulge upward from the vehicle speed sensor (150) above the vehicle speed sensor (150).   The electrical coupler (151) attached to the outward protrusion (150a) of the vehicle speed sensor (150) is disposed inside the outer peripheral edge of the hub (20h) of the rear wheel (20) in a side view. The vehicle speed detection structure for a vehicle according to claim 7 or claim 8, wherein:   The sensor cover (160) covers at least the vehicle width direction outer side, the rear side and the lower side of the outward projecting portion (150a) of the vehicle speed sensor (150). The vehicle speed detection structure for a vehicle according to claim 1.

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