KR101087004B1 - Arrangement structure for ignition coil of internal combustion engine - Google Patents

Abstract

The present invention provides an ignition coil arrangement structure of an internal combustion engine, in which the arrangement of parts is made compact and the wiring is also simple.

To this end, the present invention, the plug cap 45j of the spark plug 45 installed on the inclined cylinder head 33, various sensors provided on the throttle body 25 interposed in the intake passage 23, etc. Each electrical connection part of the connection connector 171j which arrange | positioned the electrical wiring of this and the connection connector 24j of the injector 24 provided in the intake passage is arrange | positioned at the same side of the intake passage 23, and each electrical connection part is An ignition coil 29 is disposed at a position overlapping with the cylinder block 32 as viewed from the side along the side of the side of the cylinder block 32 on the same side as the side of the intake passage 23 to be arranged. Provide an ignition coil arrangement of an internal combustion engine.

Description

Arrangement structure of ignition coil of internal combustion engine {ARRANGEMENT STRUCTURE FOR IGNITION COIL OF INTERNAL COMBUSTION ENGINE}

The present invention relates to an arrangement structure of an ignition coil of an internal combustion engine constituting a power unit mounted on a scooter type vehicle.

The power unit mounted on the scooter type vehicle is pivotally supported on the vehicle body frame via a pivot shaft provided above or below the crankcase which is the internal combustion engine.

And the ignition coil which drives the spark plug attached to a cylinder head is normally arrange | positioned above an internal combustion engine (for example, refer patent document 1).

[Patent Document 1] Japanese Unexamined Patent Application Publication No. 2004-263694

The drive unit (power unit) disclosed in the patent document 1 is pivotally supported on the vehicle body frame by a pivot shaft provided under the crankcase of the engine (internal combustion engine).

And the ignition coil is arrange | positioned in the upper position rather than a crankcase in the upper vicinity area | region of the shroud which covers an engine main body.

Therefore, in the engine of the drive unit disclosed in Patent Literature 1, since the ignition coil is far from the pivot axis of the drive unit, the swing range of the ignition coil is large, and therefore, a large free space for avoiding interference with other components is not secured. The arrangement of parts must be enlarged, and the margin of wiring cords extending from the ignition coil also increases, which complicates the wiring process.

This invention is made | formed in view of such a point, and the objective is to provide the ignition coil arrangement | positioning structure of the internal combustion engine which makes the arrangement | positioning of a compact compact and the process of wiring easy.

In order to achieve the above object, the invention described in claim 1 constitutes a front portion of a power unit pivotally pivotally supported through a pivot shaft with respect to a vehicle body frame of a scooter type vehicle, and emerges from an upper portion of a cylinder head inclined forward. In an internal combustion engine having an intake passage extending rearward, a connection connector in which electrical wiring of electrical equipment is arranged, such as a plug cap of a spark plug provided in a cylinder head, and various sensors provided in a throttle body interposed in an intake passage; Each electrical connecting portion of the connecting connector of the injector provided in the passage is all provided on the same side of the intake passage, and the side faces along the side of the side of the cylinder block on the same side as the side of the intake passage where the respective electrical connecting portions are provided. Where the ignition coil is disposed at a position overlapping with the cylinder block Said ignition coil arrangement of the combustion engine.

In the invention described in claim 2, in the ignition coil arrangement structure of the internal combustion engine according to claim 1, the power unit has a crankcase of the internal combustion engine extending rearward from a side portion at which the ignition coil is arranged, and the transmission case. And a belt-type continuously variable transmission on the side of the transmission case, the transmission case cover covering the transmission case on the side to cover the belt-type continuously variable transmission, and the ignition coil disposed along the side of the cylinder block. This is characterized in that it is arranged closer to the cylinder block than the outermost straight line connecting the front edge of the cylinder head cover and the front edge of the transmission case cover as viewed from the top.

In the invention described in claim 3, in the ignition coil arrangement structure of the internal combustion engine according to claim 2, the wiring cord extends from the ignition coil in the vertical direction.

According to the ignition coil arrangement structure of the internal combustion engine of Claim 1, the internal combustion engine which comprises the front part of the power unit pivotally pivotally supported by the pivot shaft with respect to the body frame of a scooter type vehicle, along the side of a cylinder block. Since the ignition coil is disposed at a position overlapping with the cylinder block as viewed from the side, since the distance from the pivot shaft installed above or below the crankcase of the internal combustion engine to the ignition coil is close, the swing range of the ignition coil is small, Therefore, the free space for avoiding interference with other components is small, and the component arrangement can be made compact.

Each electrical connection part of the connection connector which arrange | positioned electrical wiring, such as the plug cap of the spark plug provided in a cylinder head, the various sensors provided in the throttle body interposed in an intake passage, and the connection connector of the injector provided in the said intake passage, All are provided on the same side of the intake passage, and the ignition coil is also disposed on the side of the cylinder block on the same side as the side of the intake passage where each electrical connection portion is provided, and thus each wire including a wiring cord extending from the ignition coil. The wiring cords extending from the electronic device components are concentrated and wired on one side of the intake passage, thereby simplifying the wiring process.

According to the ignition coil arrangement structure according to claim 2, the ignition coil disposed along the side of the cylinder block has a cylinder block than the outermost straight line connecting the front edge of the cylinder head cover and the front edge of the transmission case cover when viewed from the top. Since it is disposed on the side of the cylinder block, the ignition coil is settled at each of the corner portions formed by the side surface of the cylinder block and the front end surface of the crankcase (electric case), so that it does not protrude from the power unit, and is protected from external forces such as foreign objects such as protrusion. do.

According to the ignition coil arrangement structure according to claim 3, since the wiring cord extends from the ignition coil in the vertical direction, the ignition coil including the wiring cord is settled in the corner portions formed by the side faces of the cylinder block and the front face of the transmission case. It is easy, and wiring work of wiring cord is also easy.

EMBODIMENT OF THE INVENTION Hereinafter, one Embodiment which concerns on this invention is described based on FIG.

1 is a side view of a scooter type motorcycle 1 according to an embodiment to which the present invention is applied.

The vehicle body front part 1f and the vehicle body rear part 1r are connected via the low floor part 1c, and the vehicle body frame which forms the frame | skeleton of a vehicle body is roughly the head pipe 2, the down tube 3, It consists of a main pipe (4). That is, the down tube 3 extends downward from the head pipe 2 of the vehicle body front part 1f, and the down tube 3 extends horizontally from the lower end to extend the lower side of the floor portion 1c backward. At the rear end, a pair of left and right main pipes 4 are connected, and the main pipes 4 are inclined rearwards from the connecting portion, bent horizontally at a predetermined height, and extend rearwardly.

The fuel tank 5 etc. are supported by the said main pipe 4, and the seat 6 is arrange | positioned above it.

On the other hand, in the front body portion 1f, the handle 11 is pivotally supported by the head pipe 2, the front fork 12 extends downward, and the front wheel 13 is pivotally supported at the lower end thereof. have.

The bracket 15 protrudes and is installed in the vicinity of the center of the inclined portion of the main pipe 4, and the power unit 20 is pivotally connected to the bracket 15 via a link member 16.

The power unit 20 is a water-cooled internal combustion engine 30 whose front portion is a short stroke four strokes, and has the cylinder block 32 in a substantially inclined forward position until it is almost horizontal, and the crankcase 31 is An end of the hanger bracket 18 protruding forward from the top is connected to the link member 16 via a pivot axis 19.

The power unit 20 has a belt-type continuously variable transmission 46 extending rearward from the internal combustion engine 30, and the rear wheel 21 is provided on the rear axle 21a, which is an output shaft of the deceleration mechanism 38 provided thereafter. Is installed.

A rear cushion 22 is interposed between the bracket 39 standing up at the rear of the power unit 20 with this reduction mechanism 38 and the rear of the main pipe 4.

Referring to FIG. 2, which is a side view of the power unit 20, and FIG. 3, which is the plan view, in the upper portion of the power unit 20, the intake pipe from the upper portion of the cylinder head 33 in which the internal combustion engine 30 is inclined greatly forward. (23) extends and curves backward, the throttle body (25) connected to the intake pipe (23) is located above the cylinder block (32), and the connecting pipe (23c) is connected to the throttle body (25). An air cleaner 26 connected through the belt is provided above the belt type continuously variable transmission 46.

As seen from the upper surface shown in FIG. 3, the connecting pipe 23c extends inclinedly forward from the air cleaner 26 to the cylinder axis Lc and then bends to cross the cylinder axis Lc at a predetermined angle. The direction is changed to the passage centerline Lp to reach the throttle body 25.

As a result, the predetermined intake passage length is ensured, the throttle body 25 is disposed obliquely with respect to the cylinder axis Lc, and the wiring is easily processed by preventing the ignition coil 29 from overlapping in the vertical direction. do.

In addition, the intake pipe 23 is equipped with an injector 24 for injecting fuel toward the intake port.

On the other hand, as shown in FIG. 1, the exhaust pipe 27 extending downward from the lower portion of the cylinder head 33 is bent backward and extends backward toward the left side of the power unit 20 to the left side of the rear wheel 21. A muffler (not shown) is connected.

The vehicle body front part 1f is covered from the front and rear by the front cover 9a and the leg shield 9b, and is covered with the lower part from the front to the left and right sides by the front lower cover 9c, and the center part of the handle 11 It is covered by the handle cover 9d.

The floor part 1c is covered by the side cover 9e, and the vehicle body rear part 1r is covered by the body cover 10 from the left and right sides.

4 is a cross-sectional view (the IV-IV line cross-sectional view of FIG. 3) of the internal combustion engine 30, and FIG. 5 is a cross-sectional view (the V-V line cross-sectional view of FIG. 2) of the power unit 20.

The connecting rod 43 connects the piston 42 which reciprocates in the cylinder liner 44 of the cylinder block 32, and the crank pin 40a of the crankshaft 40 to the internal combustion engine 30. As shown in FIG.

The crankcase 31 is formed by combining the left and right divided crankcase 31L and the right crankcase 31R, and the right crankcase 31R forms a half member of the crankcase part, and the left crankcase 31L. The front portion forms a half member of the crankcase portion, and serves as a transmission case that swells backward to accommodate the belt type continuously variable transmission 46 that is long before and after.

The left open side long before and after this left crankcase (electric case) 31L is covered by a transmission case cover composed of a front side cover 92 and a rear side cover 36, and a belt type continuously variable transmission ( A transmission chamber 46C in which the 46 is housed is formed, the right opening surface of the rear part is covered by the reducer case 37, and the reduction mechanism 38 is housed therein.

With reference to FIG. 5, in the so-called crankcase according to the union of the front part of the left crankcase 31L and the right crankcase 31R, the crankshaft 40 can rotate to the left and right main bearings 41 and 41. FIG. , The cam chain drive sprocket 55a, the oil pump drive gear 55b, and the AC generator 72 are installed on the right side of the extensions extending horizontally and horizontally, and the belt type continuously variable transmission on the left side. The centrifugal weight 47 and the drive pulley 48a of 46 are provided.

In the belt type continuously variable transmission 46, the V-belt 49 is applied to the driven pulley 48b provided on the drive pulley 48a and the input shaft 38a of the reduction mechanism 38, so that power is transmitted. The winding diameter of the V belt 49 in the drive pulley 48a is changed by the centrifugal weight 47 moving in accordance with the rotational speed, and at the same time, the winding diameter in the driven pulley 48b is automatically changed. It is shifting continuously.

Rotation of the driven pulley 48b is transmitted to the input shaft 38a of the deceleration mechanism 38 via the centrifugal clutch 35.

As the gear mechanism, the gear mechanism is constituted as a gear mechanism between the input shaft 38a and the intermediate shaft 38b, and between the intermediate shaft 38b and the rear axle shaft 21a, respectively, to reduce the rotation of the input shaft 38a. It transmits to the rear axle 21a, and drives the rear wheel 21 to rotate.

Referring to FIG. 5, the front portion of the rear side cover 36 forms an inwardly concave front flat portion 36af (see FIG. 3) and is opposed to the drive pulley 48a of the front flat portion 36af. The cooling wind inlet 36i is formed, and air is transferred from the cooling wind inlet 36i by the rotation of the cooling fan 48F provided on the left side of the fixed pulley half body on the left side of the drive pulley 48a. Can be introduced at 46C.

The front side cover 92 is attached to the concave front flat portion 36af of the rear side cover 36 by attaching the duct cover 91 to cover the duct cover 91 from the outside.

The duct cover 91 is formed with a cooling wind inlet 91i which is connected to the cooling wind inlet 36i of the rear side cover 36, and a louver 91L (see FIG. 2) is formed on the upper side thereof.

An air gap 96 is formed between the louver 91L at the upper rear of the duct cover 91 and the front flat portion 36af of the rear side cover 36, and the air gap 96 has an upper side shown in FIG. As shown in the plan view, the end surface of the circumferential wall 92b of the front side cover 92 is an external air inlet 95 formed to be cut into a rectangle to communicate with the outside.

When the internal combustion engine 30 is operated and the cooling fan 48F provided in the drive pulley 48a together with the crankshaft 40 rotates, the cooling air is first introduced into the air gap 96 from the outside air inlet 95. It passes through the louver 91L of the duct cover 91 from the air gap 96, and flows into the outside air introduction space 97 between the duct cover 91 and the front side cover 92, and guides to the guiding wall 91d. It is smoothly introduced into the transmission chamber 46C from the cooling wind inlets 36i and 91i to cool the belt type continuously variable transmission 46.

Referring to Fig. 5, the side wall constituting the cam chain chamber 52 of the right crankcase 31R has a large opening, which is closed by a partition wall 70 attached by a bolt 71 from the right side. The crankshaft 40 penetrates the cylindrical portion 70a of the partition wall 70.

In the AC generator 72, a rice-shaped outer rotor 74 is fixed to the right end of the crankshaft 40 through the cylindrical portion 70a of the partition wall 70 through the ACG boss 73. The inner stator 76 in which the stator coil 77 is wound inside the magnet 75 provided in the circumferential (circumferential) direction on the inner circumferential surface is fixed to the cylindrical portion 70a of the partition wall 70.

On the right side of the outer rotor 74 is attached a fan substrate 78a which is swelled in the center to form a disc, and a radiator fan 78 is formed on the fan substrate 78a to protrude to the right.

The outer circumference of the outer rotor 74 of the AC generator 72 is roughly surrounded by the circumferential wall 31Rs extending from the side wall of the right crankcase 31R to the right, and the outer circumference of the radiator fan 78 is connected to the shroud 90. Surrounded by a radiator fan 78, a radiator 80 is provided close to the right side of the radiator fan 78, and the radiator 80 is covered with a radiator cover 81 with a louver.

The four-cycle internal combustion engine 30 employs a SOHC type valve system, a valve actuating mechanism 50 is provided in the cylinder head cover 34, and a cam for transmitting power to the valve actuating mechanism 50. The chain 51 is provided between the camshaft 53 and the crankshaft 40 so that the cam chain chamber 52 has the right crankcase 31R, the cylinder block 32, and the cylinder head 33. It is installed in communication with (see Fig. 5).

In other words, the cam chain (B) between the driven cam chain sprocket 54 fitted to the right end of the cam shaft 53 oriented in the horizontal direction and the drive cam chain sprocket 55a fitted to the crankshaft 40 51 extends through the cam chain chamber 52.

On the other hand, the spark plug 45 is inserted in the cylinder head 33 toward the combustion chamber 33a from the opposite side (left side) to the cam chain chamber 52 (refer FIG. 2, FIG. 5).

Moreover, the ignition coil 29 is attached to the same left side surface of the cylinder block 32 via the support bracket 28 (refer FIG. 2, FIG. 3).

Referring to FIG. 4, the intake port 33i extends upwardly from the combustion chamber 33a of the cylinder head 33 inclined largely forward, and is connected to the intake pipe 23, and exhausts from the combustion chamber 33a. The port 33e is bent downward and connected to the exhaust pipe 26.

As shown in FIG. 4, since the valve actuation mechanism 50 in the cylinder head cover 34 is inclined greatly forward until the cylinder is close to horizontal, the opening to the combustion chamber 33a of the intake port 33i. An intake valve 56i for opening and closing the valve is provided above the cam shaft 53, and an exhaust valve 56e for opening and closing the opening to the combustion chamber 33a of the exhaust port 33e is provided below the cam shaft 53. It is installed.

As shown in FIG. 5, the camshaft 53 has a camshaft holder (via bearings 53b and 53b) on the left side wall of the cylinder head 33 and the inner side wall 33c constituting the cam chain chamber 52. 53hl, 53hr) is pivotally rotatably supported, and the driven cam chain sprocket 54 is fitted in the right end which protrudes from the bearing 53b of the right side.

As shown in FIG. 4, the intake rocker shaft 57 and the exhaust rocker shaft 59 which are arrange | positioned in the inclined up-down position of the front of the camshaft 53 are cams of right and left as shown in FIG. It is provided across the shaft holders 53hl and 53hr.

The intake rocker shaft 57 and the exhaust rocker shaft 59 are in an up and down position and pivotally supported at one end of the intake rocker arm 58 pivotally attached to the upper intake rocker shaft 57. The roller 58r is in contact with the intake cam 53i of the cam shaft 53, and the adjusting screw 58s screwed to the other end is in contact with the end of the valve stem of the intake valve 56i (see Fig. 4).

Similarly, a roller 60r pivotally supported at one end of the exhaust rocker arm 60 pivotably pivoted to the lower rocker shaft 59 for exhaust is in contact with the exhaust cam 53e of the camshaft 53, An adjusting screw 60s screwed to the other end abuts the end of the valve stem of the exhaust valve 56e (see FIG. 4).

Therefore, the intake cam 53i and the exhaust cam 53e oscillate the intake rocker arm 58 and the exhaust rocker arm 60 by the rotation of the cam shaft 53, respectively, and the intake valve 56i and the predetermined timing. The opening and closing operation of the exhaust valve 56e is performed.

In the valve operation mechanism 50, the fitting device 100 is provided on the camshaft 53.

Referring to FIG. 5, in the fitting device 100, the fitting weight 101 can swing between the left bearing 53b for pivotally supporting the left end of the camshaft 53 and the exhaust cam 53e of the camshaft 53. The fitting cam 105 is rotatably fitted on the cam surface of the exhaust cam 53e, and the fitting cam 105 is operated by the swinging of the fitting weight 101. do.

On the other hand, a circular opening is formed on the right side of the cylinder head 33, and a water pump body 121 having a cylindrical shape of the water pump 120 is supported by being inserted into the circular opening, and the water pump body 121 is supported. The pump drive shaft 123 pivotally supports through the bearing 125 therein is coaxial with the camshaft 53, protrudes to the left from the water pump body 121, and the said pump drive shaft 123 protrudes. The left end of) is screwed to the camshaft 53 to rotate coaxially.

The water pump 120 includes an impeller 124 in which a short length cylindrical portion of a short length in the axial direction, in which the opening end of the right side of the water pump body 121 is enlarged in the radial direction, is fitted to the water pump drive shaft 123. It is accommodated together with the cover 122, and the water suction cover 122b and the discharge connection tube extend in the water pump cover 122. As shown in FIG.

The power unit 20 as described above is pivotally supported on the body frame of the scooter-type motorcycle 2 by pivoting through the pivot shaft 19.

The cylinder block 32, the cylinder head 33, and the cylinder head cover 34 are inclined forward from the crankcase 31 which protrudes and installs the hanger bracket 18 supporting the pivot shaft 19 to the horizontal front. Protruding.

2 and 3, the spark plug 45 is fitted to the left side of the forwardly inclined cylinder head 33, and the support bracket 28 is similarly to the left side of the cylinder block 32. Through the tubular ignition coil 29 is attached.

Referring to the side view of FIG. 2, the ignition coil 29 is in a posture in which the center axis Li of the cylindrical case is perpendicular to the cylinder axis Lc, and is viewed from the left side of the cylinder block 32. It is arranged to be settled in the side of the.

As shown in FIG. 6 and FIG. 7, the support bracket 28 has a curved shape of a flat plate, and the cylinder block side attachment member 28b is rearward at a position slightly lower than the center of the vertically long substrate portion 28a. Protruding, the device holes 28bh and 28bl are drilled before and after the cylinder block side attachment member 28b.

The ignition coil side attachment members 28c and 28c are bent at right angles, respectively, and extended to one side (left side) at upper and lower portions of the rear end edge 28r of the substrate portion 28a. The attachment holes 28ch and 28ch are drilled in the bent portion at the rear, and the female screw members 28n and 28n are fixed to the rear surface thereof.

The locking member 28d is formed by bending to the left side from the upper portion of the front edge 28f of the substrate portion 28a, and the locking hole 28p for hanging the wiring cord in the hole 28dh formed in the locking member 28d. Is fitted.

In addition, a locking hole (28 degrees) for hanging a wiring cord is drilled in the extension portion 28e that extends further upward from the upper portion of the substrate portion 28a.

The cylinder block side attachment member 28b of this support bracket 28 is in contact with the left side of the cylinder block 32, and penetrates the attachment bolts 160 and 160 to the apparatus holes 28bh and 28bh, and the cylinder block 32 Screw), attaching the support bracket 28 to the left side of the cylinder block 32 (see FIG. 5).

And support arms 29a and 29a which extend up and down from the ignition coil 29 are attached to the upper and lower ignition coil side attachment members 28c and 28c separated from the cylinder block side attachment member 28b fixed to the cylinder block 32. The screws 161 and 161 are fixed by threaded attachment to the female thread members 28n and 28n, respectively (see Fig. 2), and the ignition coil 29 is supported by falling off the cylinder block 32 to the left.

As seen from the upper surface shown in FIG. 3, the outermost straight line Ls connecting the front edge 34f of the cylinder head cover 34 and the front edge 92f of the transmission case cover (front side cover 92). An ignition coil 29 is disposed on the side where the cylinder block 32 is located.

Therefore, the ignition coil 29 is deeply immersed in the corner portions formed by the left side surface of the cylinder block 32 and the front end surface of the left crankcase (electric case) 31L, and does not protrude from the power unit 20. The coil 29 is protected from external force such as collision of foreign matter.

With reference to FIG. 2, the high pressure cord 45c which extends downward from the electrical connection part 29j of the lower part of the ignition coil 29 bends downward and forwards the plug cap 45j of the edge part to the cylinder head 33. As shown in FIG. The spark plug 45 is fitted to the left side of the.

From the electrical connection 29j on the upper surface of the ignition coil 29, the positive primary cord 29cp and the negative primary cord 29cm extend upwards, and the intake pipe 23 passes through the left side of the intake pipe 23. It is inserted into the collection pipe 180 located above.

The high pressure cord 45c extends downward and the primary cords 29cp, 29cm extend upwards from the ignition coil 29 formed in the respective portions formed by the cylinder block 32 and the left crankcase (electric case) 31L. Therefore, the high voltage cord 45c and the primary cords 29cp and 29cm can also be partially accommodated in the above-mentioned portions and wired, so that wiring work is easy.

In addition, from the side shown in FIG. 2, since the ignition coil 29 is in the position overlapping with the cylinder block 32, it is very close to the pivot shaft 19 provided in the upper front end of the crankcase 31. As shown in FIG. Is in a positional relationship.

Therefore, since the swing range around the pivot shaft 19 of the ignition coil 29 is small, the clearance for avoiding interference with other components is small, and the component arrangement can be made compact, and the ignition coil 29 The high voltage cord 45c and the primary cords 29cp and 29cm extending from each other are also small, and the wiring can be easily processed.

2 and 3, an O ₂ sensor 170 is attached to the lower side of the left side of the cylinder head 33, and the wiring cord extends to the left side from the electrical connection 170j of the O ₂ sensor 170. 170c is directed upward along the left side surface of the cylinder head 33 and is inserted into the collection pipe 180 through the left side of the intake pipe 23.

The wiring cord 170c is caught by a latching opening 28p fitted to the support bracket 28 on the way to prevent the wiring cord 170c from shaking.

The collecting pipe 180 extends in the vehicle left-right direction above the cylinder head 33 so as to be substantially perpendicular to the cylinder axis Lc, as shown in FIG. 3, and near the right end of the cylinder head 33. It is bent and extended in front of the vehicle (see FIG. 2).

In addition, a wiring cord 24c extending from the connecting connector 24j of the injector 24 attached to the intake pipe 23 is inserted into the collecting pipe 180.

In addition, a connection connector 171j which arranges electrical wiring such as a throttle position sensor, an intake pressure sensor, and an intake air temperature sensor provided in the throttle body 25 interposed on the intake pipe 23 is located on the upper left side of the throttle body 25. A wiring cord 171c extending to the right side from the connecting connector 171j is inserted in the middle of the collecting pipe 180.

In addition, a connecting connector 172j of electrical wiring from an idle air control valve (IACV) 172 provided on the throttle body 25 is provided on the left side of the throttle body 25, and is rearward from the connecting connector 172j. The extending wiring cord 172c is inserted into the collecting pipe 180 which is bent and directed forward.

In the collection pipe 180, the earth wire 173 extends to extend the left side of the intake pipe 23 downward, and penetrates through the engaging hole 28eh of the extension 28e extending upward of the support bracket 28. It extends along the left side of the cylinder block 32, and the front surface of the left crankcase 31L, and the edge part is fastened to the front end of the rear side cover 36 with the screw 173j.

That is, the collecting pipe 180 includes the primary cords 29cp and 29cm extending from the ignition coil 29, the wiring cords 170c extending from the O ₂ sensor 170, and the connecting connector 24j of the injector 24. Wiring cord 24c extending from the connecting connector 171j of the throttle body 25, wiring cord 172c extending from the connecting connector 172j of the IACV 172, and earth wire 173 ) Are arranged.

Plug cap 45j, which is an electrical connection of spark plug 45, each electrical connection 29j extending from high voltage cord 45c and primary cord 29cp, 29cm from ignition coil 29, O ₂ sensor 170 ), Electrical connector 170j extending from wiring cord 170c, connector 24j of injector 24, connector 171j of throttle body 25, connector 172j of IACV 172, and Since all of the screws 173j, which are electrical connections of the earth wire 173, are disposed on the left side of the intake pipe 23, the high voltage cords 45c and primary cords 29cp and 29cm extending from these electrical connections. The wiring cord 170c, the wiring cord 24c, the wiring cord 171c, the wiring cord 172c, and the earth wire 173 are intensively wired, and the wiring processing is simplified.

The wiring cords wired to the left side of these exhaust pipes 23 are the front edge 34f of the cylinder head cover 34 and the front edge of the front side cover 92 as seen from the upper surface shown in FIG. The pivot shaft 19 which is provided on the left side of the outermost straight line Ls connecting 92f), is concentrated between the intake pipe 23 and the straight line Ls, and is a pivotal center of the power unit 20. Since the position is near, the fluctuation range of these wiring cords also becomes small, and the free space for avoiding interference with other components becomes small.

1 is an overall left side view of a scooter type motorcycle according to an embodiment of the present invention.

2 is an overall left side view of the power unit.

3 is a plan view of an essential part of the power unit.

4 is a cross-sectional view of the internal combustion engine (section IV-IV in FIG. 3).

5 is a cross-sectional view of the power unit (V-V line cross-sectional view of FIG. 2).

6 is a left side view of the support bracket.

7 is a plan view of the support bracket.

<Explanation of symbols for the main parts of the drawings>

1: scooter type motorcycle 2: head pipe

3: down tube 4: main pipe

18: Hanger Bracket 19: Pivot Shaft (Pivot)

20: power unit 23: intake pipe

24: injector 24c: wiring cord

25: Throttle Body 26: Air Cleaner

27: exhaust pipe 28: support bracket

29: ignition coil 29cp, 29cm: primary cord

30: internal combustion engine 31: crankcase

31L: left crankcase (electric case) 31R: right crankcase

32: cylinder block 33: cylinder head

34: cylinder head cover 36: rear side cover (electric case cover)

40: crankshaft 45: spark plug

46: beltless continuously variable transmission 92: front side cover (electric case cover)

170: O ₂ sensor 170c: wiring cord

171j: connecting connector 171c: wiring cord

172j: connection connector 172c: wiring cord

173: earth ship 180: assembly tube

Claims (3)

An internal combustion engine comprising a front portion of a power unit pivotally pivotally supported via a pivot shaft with respect to a body frame of a scooter-type vehicle, the internal combustion engine having an intake passage extending from the top of a cylinder head inclined forward and extending rearward, Each of the electrical connections of the plug cap of the spark plug provided in the cylinder head, the connection connector in which the electrical wiring of the electrical equipment provided in the throttle body interposed in the intake passage and the connection connector of the injector provided in the intake passage are all Installed on the same side of the passageway, An ignition coil arrangement of an internal combustion engine, characterized in that an ignition coil is disposed at a position overlapping with the cylinder block as viewed from the side along the side of the side of the cylinder block on the same side as the side of the intake passage where the respective electrical connections are provided. rescue. The crankcase of the internal combustion engine extends rearward from a side portion where the ignition coil is disposed, and serves as a transmission case, and a belt type continuously variable transmission is provided on the side of the transmission case. The electric case cover covers the electric case from the side to cover the belt continuously variable transmission, The ignition coil disposed along the side of the cylinder block is disposed closer to the cylinder block than the outermost straight line connecting the front edge of the cylinder head cover and the front edge of the transmission case cover as viewed from the top. Ignition coil layout structure. The ignition coil arrangement structure of an internal combustion engine according to claim 2, wherein a wiring cord extends from the ignition coil in a vertical direction.

Images