CN1075597C - Ignitor of IC engine - Google Patents

Abstract

In a vehicle equipped with a belt-type continuously variable transmission 35 and a starter mechanism, the starter mechanism is driven by the starter motor 110 to make the jump-in gear 117 protrude, thereby meshing with the gear 77a formed on the outer periphery of the drive pulley 77, so that it is connected to the drive. The crankshaft 40 that rotates integrally with the pulley 77 rotates to start the internal combustion engine; the internal combustion engine starting device has a belt-type continuously variable transmission chamber bonded by rubber sintering to the side surface of the drive pulley 77 formed with the above-mentioned gear 77a, which is opposite to the belt 75. Rubber fan 118 for cooling. Therefore, the noise generated when the gears mesh can be reduced.

Description

internal combustion engine starter

The present invention relates to an internal combustion engine starting device in a vehicle provided with a belt-type continuously variable transmission.

When starting the disclosed starting mechanism, the driving of the starter motor causes the jump-in gear to protrude and mesh with the gear integrated with the crankshaft to transmit the rotation to the crankshaft, thereby starting the internal combustion engine. Since the mutual meshing of the gears is released except at the time of starting, it is possible to completely prevent the starter motor from becoming a load.

For example, Japanese Patent Publication No. 3-33792 discloses such a mechanism for starting an internal combustion engine: driven by the starter motor, the starting gear rod of the jump-in mechanism protrudes, and is arranged on the outer periphery of the fixed belt pulley of the belt-type continuously variable transmission. The crankshaft is engaged with the starter ring gear on the crankshaft, which turns the crankshaft and starts the internal combustion engine.

However, since the starter rod jumps out to mesh with the starter ring gear, a loud rattling noise is sometimes generated.

The present invention is proposed in view of such shortcomings, and its purpose is to provide a starting device for an internal combustion engine, which can reduce the gear jumping in due to the driving of the starter motor when starting the internal combustion engine while cooling the belt type continuously variable transmission chamber. The meshing noise generated when meshing with the gear formed on the outer periphery of the drive pulley enables quiet starting.

To achieve the above object, the present invention provides a starting mechanism in a vehicle provided with a belt-type continuously variable transmission and a starting mechanism, the starting mechanism drives a starter motor mounted on an internal combustion engine with a belt-type continuously variable transmission, and The gear formed on the outer periphery of the fixed pulley of the belt-type continuously variable transmission meshes to rotate the crankshaft, thereby starting the internal combustion engine; this internal combustion engine starting device is characterized in that: on the opposite side of the belt to the drive pulley formed with the above gear A rubber fan for cooling the belt-type continuously variable transmission chamber is pasted by rubber sintering on the side.

Since the rubber fan for cooling the belt-type continuously variable transmission chamber is pasted on the side surface of the driving pulley with the gear opposite to the belt through rubber sintering, the fan cools the belt continuously variable transmission chamber and at the same time The vibration-absorbing and sound-absorbing effects of the elasticity of the fan rubber, together with the shock-absorbing and sound-absorbing effects of the belt on the side opposite to the fan that drives the pulley, can effectively reduce the meshing noise of jumping into the gears.

Since the fan for cooling the belt-type continuously variable transmission chamber, which was also available in the past, has the effect of shock absorption and sound absorption, special parts for shock absorption and sound absorption are not required, the number of parts does not need to be increased, and no special space is required. It also does not increase the size of the internal combustion engine.

In the internal combustion engine starting device of the present invention, an exhaust opening is formed at the rear of the transmission case cover of the above-mentioned belt type continuously variable transmission, and the opening facing the rubber fan at the front portion is blocked, so that the opening in the belt type continuously variable transmission chamber is closed. There is no cooling air inlet for cooling the belt-type continuously variable transmission chamber at the front, so the above-mentioned biting noise is difficult to be transmitted to the outside of the belt-type continuously variable transmission chamber, making it quieter.

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

Fig. 2 is a cross-sectional view of the internal combustion engine of the scooter taken along line II-II in Fig. 1 .

Fig. 3 is a sectional view taken along line III-III of Fig. 2 .

Fig. 4 is a sectional view taken along line IV-IV in Fig. 3 .

Figure 5 is a left side view of the stationary pulley and cooling fan in the drive pulley.

Fig. 6 is a sectional view taken along line VI-VI of Fig. 5 .

Fig. 7 is a sectional view taken along line VII-VII of Fig. 5 .

Fig. 8 is a left side view of the transmission case cover.

An embodiment of the present invention will be described below with reference to FIGS. 1 to 8 .

Fig. 1 is a side view of a small motorcycle equipped with a unit swing type internal combustion engine of the present invention.

The front part 2 of the car body is connected with the rear part 3 of the car body through a lower platform part 4 , and the vehicle frame constituting the skeleton of the car body is composed of a down bend 6 and a main pipe 7 .

That is, the down bend pipe 6 extends downward from the steering head 5 of the vehicle body front portion 2, and the down bend pipe 6 is bent horizontally at the lower end, extends rearward through the lower part of the rear portion 4, and is a pair of left and right sides at the rear end. The main pipes 7 are connected to each other, and the main pipes 7 stand obliquely rearward from the connection, are bent horizontally at a predetermined height, and then extend rearward.

The fuel tank and the storage tank are supported by the main pipe 7, and a seat 8 is provided above it.

On the other hand, the vehicle body front portion 2 is supported by the steering head 5, a handlebar 11 is provided above, and a front fork 12 extends downward, and a front wheel 13 is pivotally supported at the lower end thereof.

A bracket 15 protrudes from the lower end of the upright portion of the main pipe 7 , and a swing unit 17 is swingably connected and supported on the bracket 15 through a connecting rod 16 .

A single-cylinder 4-stroke internal combustion engine 30 is mounted on the front portion of the swing unit 17, and its cylinder block 32 is tilted forward to a nearly horizontal state. The end that protrudes ahead) is connected with above-mentioned connecting rod 16 by pivot 19.

A belt-type continuously variable transmission 35 is connected to the rear from the internal combustion engine 30 , and a reduction mechanism 38 provided at the rear thereof is supported on the shaft of the rear wheel 21 .

A rear shock absorber 22 is provided between the upper end of the reduction mechanism 38 and the upper bent portion of the main pipe 7 .

The upper part of the rocking unit 17 is equipped with a carburetor 24 connected to the air intake pipe 23 (the air suction pipe 23 extends from the top of the cylinder head 33 of the internal combustion engine 30 ) and an air cleaner connected to the carburetor 24 . device 25.

On the other hand, the main support 26 is connected with the suspension 18 protruding from the bottom of the unit swing box 31 with a shaft, and the base end of the starting rod 28 is fastened to extend out from the transmission case cover 36 of the belt type continuously variable transmission 35. On the starting shaft 27 of this starting rod 28, a starting pedal 29 is provided at the front end of the starting lever 28.

The vehicle body front 2 is covered front and rear by a front cover 9a and a rear cover 9b, and is covered by a front under cover 9c from left and right sides, and the center portion of the handlebar 11 is covered by a handlebar cover 9d.

The deck part 4 is covered by the side cover 9e, and the vehicle body rear part 3 is covered from the left and right sides by the vehicle body cover 10a and the rear part side cover 10b.

FIG. 2 is a cross-sectional view of the rocking unit 17 cut along line II-II in FIG. 1 and developed.

The unit swing box 31 is formed by combining the left unit box 31L and the right unit box 31R which are divided into left and right parts. The right unit box 31R constitutes half of the crankcase. The crankcase part 31a, the transmission case part 31b in the center and the speed reducer case part 31c in the rear part are constituted.

The left open surface of the left unit case 31L is covered by a transmission case cover 36, and a belt-type continuously variable transmission 35 is accommodated therein. A reduction mechanism 38 is housed inside.

In the so-called crankcase of the crankcase part 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 part is provided with an AC generator in the extension part extending horizontally to the left and right. 60, the left extension is provided with the cam chain drive sprocket 55 and the drive pulley 76 of the belt type continuously variable transmission 35.

A connecting rod 43 of the internal combustion engine 30 is connected to a piston 42 (reciprocating in a cylinder liner 44 of the cylinder block 32 ) and a crank pin 40 a of a crankshaft 40 .

The 4-stroke internal combustion engine 30 adopts the valve system of the OHC type, and a valve train 50 is arranged in the cylinder head cover 34, and a cam chain 51 that transmits power to the valve train 50 is erected between the camshaft 53 and the crankshaft 40. The cam chain chamber 52 communicates 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, and is mounted between the driven sprocket 54 embedded in the left end of the camshaft 53 (the camshaft 53 points to the left and right horizontal direction) and the above-mentioned drive sprocket 55 embedded in the crankshaft 40. between.

A spark plug 45 is fitted into the cylinder head 33 so that it faces the combustion chamber from the side (right side) opposite to the cam chain chamber 52 .

As shown in Fig. 3, the valve mechanism 50 in the cylinder head cover 34, because the cylinder is tilted forward to a nearly horizontal state, so the intake valve 56 and the exhaust valve 57 are arranged above and below the camshaft 53, and the rocker arms 59, 59 Rock freely installed on the upper and lower rocker shafts 58, 58, due to the cam rotation of the camshaft 53, the rocker arms 59, 59 just shake, so that the intake valve 56 and the exhaust valve 57 are opened and closed with a prescribed cycle.

In the AC generator 60 provided on the right side of the right unit case 31R, a bowl-shaped outer rotor 62 is fastened to the end of the crankshaft 40 protruding from the central cylindrical portion 31d of the right unit case 31R through the ACG hub 61, and at its A magnet 63 is disposed along the circumferential direction on the inner peripheral surface, and inside the magnet 63, a stator 64 around which a stator coil 65 is wound is fixed to the central cylindrical portion 31d.

A forced air cooling fan 66 is installed on the right side of the outer rotor 62 , and a fan case 67 covers its side, and a fan case 68 is provided to connect with the fan case 67 and cover the cylinder body 32 and the cylinder head 33 .

On the other hand, in the crankcase part 31a of the unit swing box 31, the above-mentioned cam chain chamber 52 is just formed by separating it from the crank chamber by the main bearing 41, and the left side wall of the cam chain chamber 52 is to separate the left belt belt. The partition wall 71 separating the continuously variable transmission chamber 70 from the cam chain chamber 52 is formed with a circular through-hole 71a (in a flat cylindrical shape with a large diameter) through which the crankshaft 40 can pass. The ring-shaped seal 72 is press-fitted into the through hole 71 a, and the crankshaft 40 passes through the hollow portion of the ring-shaped seal 72 .

The drive sprocket 55 is fitted on the crankshaft 40 between the seal 72 and the main bearing 41. In the state where the cam chain 51 is wound on the drive sprocket 55, its maximum outer diameter is larger than that of the ring-shaped seal. 72 and the inner diameter of the through hole 71a are smaller.

Therefore, if the annular seal 72 is removed from the through hole 71a, the through hole 71a having a large diameter can be used to remove the drive sprocket 55 or wind the cam chain 51 thereon.

The belt-type continuously variable transmission chamber 70 and the cam chain chamber 52 are separated fluid-tightly by the seal 72 to prevent oil from leaking into the continuously variable transmission chamber 70 .

On the crankshaft 40 extending through the seal 72, there is provided a drive pulley 76 which is rotatable simultaneously therewith.

The driving pulley 76 is made of a fixed pulley 77 and a movable pulley 78. The fixed pulley 77 is fastened to the left end of the crankshaft 40 through a hub 79. On the right side, the movable pulley 78 is splined with the crankshaft 40. The movable pulley The disc 78 can rotate together with the crankshaft 40 and can slide axially so as to approach or move away from the fixed pulley 77 , and the V-belt 75 is clamped and wound between the two pulleys 77 , 78 .

On the right side of the movable belt pulley 78, near the fixed position of the above-mentioned annular seal 72, a cam plate 80 is provided, and a slider 80a arranged on its outer peripheral end is slidably engaged with the cam plate sliding hub 78a. A disc sliding hub portion 78 a is formed in the axial direction at the outer peripheral end of the movable pulley 78 .

The movable pulley 78 forms a tapered surface on the side of the cam disk 80 toward the side of the cam disk 80 , and the roller 81 is clamped by the cam disk 80 and accommodated inside the tapered surface.

Therefore, when the rotational speed of the crankshaft 40 increases, the roller 81 rotating simultaneously between the movable belt pulley 78 and the cam disk 80 moves in the centrifugal direction by the centrifugal force, and the movable belt pulley 78 is pressed by the roller 81 and moves leftward. , thereby approaching the fixed pulley 77, the V-belt 75 clamped between the two pulleys 77, 78 is moved and wound in the centrifugal direction, thereby making the diameter of the pulley larger.

The rear driven pulley 86 corresponding to such a driving pulley 76 is composed of two pulleys 87, 88: the fixed pulley 87 is embedded in the speed reducer input shaft 92 of the relative speed reduction mechanism 38 and is rotatably supported. On the inner sleeve 89 that is worn, on the left side of the fixed belt pulley 87, the movable belt pulley 88 is embedded on the outer cover 90 that is freely slidably supported on the inner sleeve 89 in the axial direction.

Above-mentioned V-belt 75 is pinched between two belt pulleys 87,88.

The centrifugal clutch 91 is arranged on the left side of the reducer input shaft 92 and the inner sleeve 89. When the rotation speed increases, the centrifugal clutch 91 is engaged, and the power transmitted to the inner sleeve 89 by the V-belt 75 is transmitted to the reducer input shaft 92.

The speed reduction mechanism 38 transmits the power transmitted to the reducer input shaft 92 to the output shaft 94 after being decelerated by the intermediate shaft 93 through gear engagement, and the output shaft 94 rotates the rear wheel 21 through the axle shaft of the rear wheel 21 .

The hub part of rear wheel 21 is provided with drum brake 95, and the drum brake arm 97 that connects brake cable is housed on the drum brake shaft 96, and when pulling brake cable, drum brake arm 97 shakes, and drum brake arm 97 is equipped with. Drum brake shaft 96 rotates, and drum brake 95 works.

The transmission case cover 36 covering the belt-type continuously variable transmission chamber 70 from the left side, and covering the centrifugal clutch 91 from the front drive pulley 76 to the rear, and the above-mentioned starter shaft 27 is rotatably passed through and supported in the front of the center. , a driving helical gear 100 is mounted on the inner end of the starting shaft 27 and is acted by a return spring 101 .

A sliding shaft 102 coaxial with the crankshaft 40 is rotatably and axially movably supported on the inside of the front portion of the transmission case cover 36, and a driven helical gear 103 is formed on the sliding shaft 102, and the driven helical gear 103 is connected to the above-mentioned driving gear. The helical gears 100 are meshed, and a ratchet 104 is fastened at the right end, and the whole has a tendency to move to the left by a friction spring 105 .

On the other hand, on the hub 79 on the side of the crankshaft 40 , a pawl 79 a is formed to face the ratchet wheel 104 , and both can be separated or engaged by sliding of the slide shaft 102 .

Therefore, when stepping on the starting pedal 29, the starting shaft 27 is rotated against the spring force of the return spring 101 through the starting rod 28, the driving helical gear 100 and the starting shaft 27 rotate integrally, and the driven helical gear 103 meshed with it and the sliding shaft 102 integrally rotates, and at the same time slides to the right against the spring force of friction spring 105, so that ratchet 104 is engaged with pawl 79a of hub 79, and crankshaft 40 can be forcibly rotated, thereby starting internal combustion engine 30.

On the other hand, the internal combustion engine is provided with a starter motor 110 above the crankcase portion 31a of the left unit case 31L. As shown in FIG. A magnet 111 surrounds it, and a coil 112 is wound on it, protruding on the left side, and a gear 113a is formed at the end of the rack bar 113 .

Jump into the gear mechanism 115 by the crankcase portion 31a and the transmission case cover 36, make its axis point to the left and right horizontal direction, be arranged between the starter motor 110 and the drive pulley 76, the rack gear 113a of the starter motor 110 and the jump into The input gear 116 on the right side of the gear mechanism 115 meshes, and the jump-in gear 117 on the left side on the other side meshes with the starting ring gear 77a formed on the outer periphery of the fixed pulley 77 when jumping out to the left.

Therefore, when the starter motor 110 is driven, the rotation of the gear bar 113 is transmitted to the input gear 116 of the jump-in gear mechanism 115, and the jump-in gear 117 jumps to the left and engages with the starting ring gear 77a of the fixed belt pulley 77 to make the fixed belt The simultaneous rotation of the disc 77 and the crankshaft 40 allows the internal combustion engine 30 to be started.

If the starter motor 110 is stopped, the jump-in gear 117 is retracted and the engagement with the starter ring gear 77a is released.

The fixed belt pulley 77 formed with the starting ring gear 77a (receives the engagement of the jumping gear 117), on the side (left side) opposite to the side holding the V-belt 75, a rubber belt is pasted by rubber sintering. The cooling fan 118 cools the belt type continuously variable transmission 35 by the rotation of the cooling fan 118 .

As shown in Figures 5 to 7, the cooling fan 118 made of rubber is formed on one surface of a hollow disk-shaped thin film 118a protruding in the circumferential direction with a number of blades 118b that are bent backward relative to the direction of rotation. , the film 118a is sintered on the left side of the fixed pulley 77.

In this way, the fixed belt pulley 77 that bears the gear 117 that jumps into has a V-belt 75 on one side, and a cooling fan 118 made of rubber is pasted on the opposite side, and a structure is formed, that is, the fixed belt pulley 77 is clamped by the V-belt 75 and the cooling fan 118 that have the shock absorption and sound absorption effect produced by rubber elasticity, which can effectively reduce the meshing noise generated when the jumping gear 117 meshes into the starting ring gear 77a of the fixed belt pulley 77, The internal combustion engine 30 can be started quietly.

The cooling fan 118 is made of rubber and can be elastically deformed, so even if a foreign object is bitten during rotation, it can be avoided by elastic deformation without stopping the rotation or damaging the blade 118b.

Since the cooling fan was also installed on the drive pulley in the past, the cooling fan is made of rubber in this internal combustion engine 30, which does not require additional special parts for shock absorption and sound absorption, does not increase the number of parts, and does not require The space occupied by special parts does not make the volume of the internal combustion engine 30 larger.

As shown by the dotted line in FIG. 8, the transmission case cover 36 constituting the belt-type continuously variable transmission chamber 70 of the present invention has a cylindrical exhaust duct 119 obliquely formed longitudinally along the inner surface of the side wall at a position approximately near the center in the front-rear direction. The upper end opening is opened on the indoor side, and the lower end opening is opened on the outdoor side, so that heat energy in the continuously variable transmission chamber 70 is discharged to the outside through the exhaust duct 119 .

On the transmission box cover 36, except the above-mentioned exhaust passage 119, there are no openings such as air intake passages communicated with the outside world, so the above-mentioned lowered but still slightly generated jump-in gear 117 engages the fixed belt pulley 77 and starts the ring gear. The biting noise at 77a is difficult to be transmitted to the outside, thereby blocking the abnormal noise when the internal combustion engine 30 starts, making it more silent.

In the present invention, a fan made of rubber for cooling the chamber of the belt-type continuously variable transmission is pasted by rubber sintering on the side surface of the drive pulley with the gear opposite to the belt, so the fan is effective in cooling the belt-type continuously variable transmission. At the same time, due to the shock absorption and sound absorption effect of the rubber elasticity of the fan, plus the shock absorption and sound absorption effect of the belt on the opposite side of the fan driving the pulley, it can effectively reduce the meshing noise of jumping into the gear.

Since the fan for cooling the belt-type continuously variable transmission chamber, which is also available in the past, has the effect of shock absorption and sound absorption, special parts for shock absorption and sound absorption are not required, the number of parts does not need to be increased, and no special space is required. Does not increase the size of the internal combustion engine.

Since the belt-type continuously variable transmission chamber has no other openings except for the exhaust opening at the rear, it is difficult for the toothing noise to be transmitted to the outside of the belt-type continuously variable transmission chamber, making it quieter.

Claims (2)

1. the ignitor of IC engine in the vehicle, this vehicle set has starting mechanism, this starting mechanism by drive installation in the starter motor that has on the internal-combustion engine of belt type continuously variable transmission, with the gear engagement on the outer periphery of the fixedly belt pulley that is formed at belt type continuously variable transmission, make crankshaft rotating, thus cranking internal combustion engine; This ignitor of IC engine is characterised in that:

On the side drive pulley that is formed with said gear, an opposite side with belt, be pasted with the rubber system fan of belt type continuously variable transmission chamber cooling usefulness by the rubber sintering.

2. ignitor of IC engine as claimed in claim 1 is characterized in that: the rear portion of the transmission case cover of above-mentioned belt type continuously variable transmission is formed with the exhaust opening, and its anterior opening of rubber system fan of facing is by obturation.

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