FR2617540A1 - STARTING DEVICE FOR A TWO-WHEELED MOTOR VEHICLE - Google Patents

Abstract

This device comprises between a motor 3 and a drive shaft 10 for driving the driving wheel, a transmission with pulleys 4, 7 and belt 8, as well as means provided between a shaft 6 of a starter pedal 21 and the crankshaft 2 of the engine 3, the transmission being formed of a driving pulley 7 integral with the crankshaft 2 and of a receiving pulley 4 mounted on a shaft 5 capable of driving the driving wheel by means of a clutch 20, and the 'drive shaft 10; a pair of gears 9, 11 is arranged between the shaft 6 of the pedal 21 and the tubular shaft 5 of the receiving pulley 4 in order to transmit the rotation of the first shaft 6 to the second 5, which itself drives the pulley receiver 4 and the drive pulley 7 associated with the crankshaft 2 to start the engine 3. This arrangement reduces the bulk while ensuring a sufficient multiplication ratio between the shaft of the starting pedal 21 and the crankshaft 2.

Description

The subject of the present invention is a dis-

  positive start for a two-wheeled motor vehicle, comprising pulley and belt transmission means between a shaft of a start pedal and a crankshaft of the engine. The pulley and belt system * consists of a drive pulley secured to the crankshaft and a take-up pulley mounted on a tubular shaft capable of driving the drive wheel by means of a clutch and a

  tree placed in the tubular tree.

  We know two-wheeled vehicles with a start pedal, commonly called "kick" pedal. To obtain a sufficient multiplication ratio between the shaft carrying this starter pedal and the engine crankshaft, it is

  general necessary to provide an intermediate shaft -

  so as to carry out the transmission between the shaft of

  the starter pedal and the crankshaft through

  median of two pairs of gears. multipliers.

  This arrangement complicates transmission and

increases bulk.

  It is also known to carry out the trans-

  mission by a single pair of gears, but the report

  multiplication port obtained is then relatively low and requires to provide on the shaft of the starter pedal a pinion of a large diameter, which

increases bulk.

  In addition, if the motor is mounted oscillating on the frame, which is often the case, the entire intermediate shaft must be able to move

  with the engine, which also complicates the provision

  sitive. Other arrangements are also known in which the actuation of the starter pedal controls a pressure relief valve of the engine combustion chamber, in order to facilitate starting.

of it.

  The object of the invention is to provide a dis-

  positive which allows to start the engine of a

  two-wheeled vehicle from a starter pedal

  rage, eliminating the above drawbacks, while having a sufficient multiplication ratio

  between the shaft of this starter pedal and the

engine crankshaft.

  According to the invention, a pair of gears is arranged between the pedal shaft and the shaft of the receiving pulley in order to transmit the rotation of the first shaft to the second, which itself drives the receiving pulley and the driving pulley. associated with

  crankshaft to start the engine.

  According to an embodiment of the invention

  tion, in which the motor and the drive pulley are

  mounted on an oscillating support on the chassis of the

  hicle and a spring is fixed by its ends to the

  support and to the chassis so as to stress cons-

  the support to maintain a tension of

  sufficient belt, means are provided for blocking

  quer the engine in its normal angular position so

  maintain the tension of the belt during the

engine running.

  According to one embodiment of the pre-

  mentioned, these include an oscillating mounted cam

  on the chassis, linked by a rod to the starting system

  rabies, solicited by an elastic organ fixed to the frame

  located so that in the inactive position said cam

  is released relative to a stop integral with the support

  oscillating port of the engine, and that the actuation of the starter pedal causes the cam to tilt in a position where it cooperates with the stopper preventing the engine and the crankshaft pulley from approaching the receiving pulley, returning to its position .: nitial of the starter pedal automatically bringing the cam back to its starting position retracted with respect to

at the stop.

  According to another embodiment of the invention, the device further comprises

  means of decompressing the engine when it is started

  rage, and these means comprise a cam integral with the starter pedal and able to cooperate with a lever coupled to a control cable of a valve of a decompressor during actuation of the starter pedal, elastic means then recalling automatically the lever and the cable on the one hand, and

  the valve on the other hand to their original positions.

  Other features and advantages of

  the invention will appear during the description

  which will follow, made with reference to the accompanying drawings

  which illustrate several embodiments of them.

tre nonlimiting examples:

  - Figure 1 is an elevational view la-

  partial teral of the engine and starting device assembly of a vehicle with two rodes covered by

the invention.

  _ Figure 2 is a top view with partial horizontal section of a first embodiment of the starting device for a two-wheel motorized vehicle according to the invention, the shaft of the starting pedal being in the disengaged position;

  - Figure 3 is a view similar to the Fi-

  gure 2 showing the pinion of the shaft of the starter pedal in engagement with a corresponding pinion of a second shaft carrying a receiving pulley; - Figures 4 and 5 are simplified side views illustrating two embodiments of a system for blocking the engine during startup, in a vehicle whose engine is mounted oscillating on the frame;

  - Figures 6 and 7 are simplified views

  linked respectively in lateral elevation and

  above two other embodiments in which

  the starting device is equipped with a system making it possible to increase the tension of the transmission belt during starting, the engine being mounted oscillating on the chassis of the vehicle; - Figure 8 is- a schematic view of a system for controlling the decompression of the engine when it starts, which can be added to the starting device of the previous Figures;

  - Figure 9 is an elevational view la-

  of an industrial embodiment of the system

  engine decompression control valve;

  - Figures 10 to 14 are analog views

  gues in Figure 9 and on a reduced scale, illustrating the successive phases of the operation of the

  decompression control when starting the engine.

  The two-wheeled motor vehicle targeted by the invention comprises (Fig. 1 to 3) a pot motor 3

  exhaust P. a drive shaft 10 of a

  gnon and a driving wheel chain (these elements not being represented), and a transmission between a

  crankshaft 2 of engine 3 and shaft 10.

  This transmission includes a pulley mo-

  trice 7 mounted on crankshaft 2, a pulley receiving

  trice 4 mounted on a tubular shaft 5 containing the drive shaft 10, a belt 8 connecting the pulleys 7 and 4, and a clutch 20 capable of transmitting to the shaft 10, the rotation of the pulley

  receptor 4 in a manner known per se.

  The pulleys 4 and 7 are d: dimensioned so as to ensure a sufficient multiplication ratio between the shaft 6 of the starter pedal and the crankshaft 2, the receiving pulley 4 having for this purpose a diameter much greater than that of the pulley

drive 7.

  The starting device comprises a shaft 6 parallel to the drive shaft 10, and a pedal

  21 start (kick pedal) allowing

drag the shaft 6 in rotation.

  A pair of gears 9, 11 is arranged between the shaft 6 of the pedal and the shaft 5 of the receiving pulley 4 in order to transmit the rotation of the shaft 6 to the shaft 5 and to the pulley 4. The pinion 9 is fixed on the end of the shaft 6 so as to be offset axially with respect to the pinion 11 of the shaft 5 when the device is at rest (Figure 2), position in which the pinion 9 and the shaft 6 are constantly in demand, in a manner known per se,

  by a return spring 12 surrounding the shaft 6.

  When the starter pedal 21 is actuated, a device known per se and not shown axially displaces the shaft 6 so that its pinion 9 comes to mesh with the pinion 11, by which the shaft 5 and the receiving pulley 4 are driven rotating (Figure 3). The belt 8 then rotates the pulley 7 and the crankshaft 2. As soon as it is released. the pedal 21, the pinion 9 is uncoupled from the pinion 11, the motor 3 driving the shaft 10 by means of the belt 8,

7.4 pulleys and clutch 20.

  Figures 4 and 5 illustrate two embodiments of the invention in which it is applied to a vehicle whose engine 3 and its driving pulley 7 are mounted on a support 13 oscillating around an axis 14 on the frame or chassis 15 of the vehicle. A spring 16 fixed at its ends to the support 13 and to the frame 15 constantly stresses the support 13 and therefore the drive pulley 7, so

  maintain sufficient tension of the belt 8.

  Means are provided for locking the motor 3 and the pulley 7 in their normal angular position, in order to maintain the tension of the tension at a sufficient value.

  belt 8 during engine start 3.

  In the embodiment of FIG. 4, these means comprise a cam 17 mounted oscillating on the chassis 15 on either side of an axis 18 and

  which is linked by a rod 19 to the receiving pulley 4.

  The cam 17, which can be smooth or notched, is urged, at its end remote from the support 13, by an elastic member 23 fixed to the chassis 15, so that in the inactive position, the cam 17 is released relative to a stop 24 in solidarity with

oscillating support 13.

  The actuation of the starting pedal 21 in the direction of the arrow F rotates in the same direction the receiving pulley 4, which in turn drives the rod 19 the cam 17, which switches around the axis 18 in coming to be placed between the latter and the stop 24 (position shown in Figure 4). In this position, the cam 17 opposes the tilting of the support 13 and consequently of the motor 3 and of the pulley 7 during startup. and therefore prevents the pulley 7 from approaching the receiving pulley

  4. Therefore, the tension of the belt 8 is main-

  held during start-up, while in the absence of the cam 17 and its control means, the tension of the belt 8 would decrease due to the fact that the force exerted on the start-up pedal 21 is transmitted to the belt 8 and would reverse the engine assembly (3,7) towards the pulley 4, reducing the tension of the belt

  8 and causing it to slip.

  The return of the pedal 21 to its initial position automatically brings the cam 17 back to its starting position, retracted with respect to the stop 24. The distance between the motor 3 and the pulley 4 is

  then normally maintained by the spring 16.

  In the variant of FIG. 5, the means for blocking the oscillating support 13 when the engine starts include a connecting rod 25 linked to the engine 3 at one of its ends and slidably mounted on the chassis 15 at its opposite end. For this purpose, buttonhole 26 is provided in this second

  end, and a finger 27 secured to the chassis 15, -

  engaged in this buttonhole 26, allows displacements of the connecting rod 25 and of the driving pulley 7 relative to the chassis 15. A cam 28 articulated on the chassis 15 is biased by a compression spring 29, one end of which is fixed to the chassis, so as to be retracted with respect to a stop 31 provided on the connecting rod 25, when the starter pedal 21 is at rest. In this rest position, in fact, an end portion 21a of the pedal 21 acts on an associated end of the cam 28 so as to keep the latter released relative to the

  connecting rod 25 and the compressed spring 29.

  When the pedal 21 is actuated (arrow F), its end 21a releases the cam 28 which then switches under the action of the spring 29 to come into place in its position illustrated in FIG. 5, where it is at

2 6 1 7 5 4 0

  contact of the stop 31. The connecting rod 25 and the cam 28 are then in the extension of one another between the axes of rotation of the pulleys 4 and 7, which ensures the automatic blocking of the pulley 7 and of the motor 3 in their initial position before starting. Any reduction in the distance between the pulley 7 and the pulley 4 is thus prevented, the tension of the belt 8 is maintained and any risk of slipping thereof is avoided. The return to its initial position of the starting pedal 21 causes, via the end 21a, a separation of the cam 28 relative to the connecting rod, so that the cam 28 returns to its initial position by compressing the spring 29. The buttonhole 26 of the connecting rod 25 allows variations in the distance between the pulleys 4 and 7, which makes it possible to take into account the length and wear of the belt, as well as the dispersion of the manufacturing dimensions or the engine backing up in the case of a transmission with

dimmer.

  In the two embodiments of FIGS. 4 and, the cams 17, 28 can be smooth or notched, and automatically block the drive pulley 7 and the motor 3 in their initial angular position during start-up, whatever the distance between the pulley

drive and take-up pulley 4.

  In the embodiments of Figures 6 and 7, the motor 3 and the drive pulley 7 are also mounted on a support 13 oscillating around the axis 14 on the chassis 1E, and means are provided for increasing the tension of the belt 8 during

engine start 3.

  To this end in this embodiment, a rod 32 is connected to a cam 33 of the shaft 30 of the starter pedal 21, and there is provided a spring 34 with two branches 35.36 in V whose ends are

  respectively fixed to the support 13 and to the rod 32.

  The branch 36 is supported on the chassis 15 when the starting system 21, 33 is at rest (position shown in solid lines in Figure 7), the spacing between the branches 35 and 36 then being maximum. At start-up, when the pedal 21 switches, the cam 33 secured to the shaft 30 pushes the rod 32 towards the motor 3, so that the branch 36 is brought closer to the branch 35 by this movement of the rod 32, to occupy position 36a (in phantom). This displacement of the branch 36 towards the branch 35 causes an increase in the compression of the spring 34 and consequently an increase in the tension of the belt 8, which eliminates any risk of it slipping during the start-up phase. The return of the starting system 21, 30, 33 to its initial position brings the rod 32 and the branch 36 to

their starting position.

  FIG. 8 schematically shows a first embodiment of a hub. engine decompression when started, which can be

  added to the devices described above.

  In this embodiment, the decompression means comprise a cam 37 integral with the starter pedal 21 and able to cooperate with a lever 38 coupled to a cable 39 for controlling a

  valve 41 of a decompressor 42, during actuation

  pedal 21. A spring 43 automatically returns

  only the valve 41 to its initial position when the starter pedal 21 returns to its starting position, and likewise a spring 44 associated with the cable 39 and bearing on the lever 38 brings the cable 39 to

its initial position.

  When the pedal 21 is actuated, the cam 37 switches the lever 38 coupled to the cable 39 of the decompressor 42, so that the start of the stroke of the starting system decompresses the engine. Then, at the end of travel of the pedal 21, the cam 37 no longer acts on the lever 38, while the starting system ensures the starting of the engine. The cable 39 is connected, beyond the decompressor 42, to a manual handle 40 for controlling the decompressor 42. This handle makes it possible to act on the decompressor? 42 manually for

  stop the engine or start it.

  In the embodiment illustrated in FIG. 9, the means for decompressing the engine are constituted in the following manner: An automatic lever 45 is articulated around an axis 46 fixed on a support 47 and secured with

  the end of the decompressor control cable 48.

  A pawl 49 is articulated on the automatic lever around an axis 55 and returned to a rest position by a spring 51 whose ends are respectively fixed to the pawl 49 and to a manual lever 52 also articulated on the axis 46, this lever 52 being connected to a cable 53 for manual control of

decompression.

  The pawl 49 has a terminal spout 49a adapted to be able to cooperate with a cam stop 56 integral in rotation with the starter pedal (not shown), the shaft 6 and the return spring 12 of which can be seen. The automatic lever 45 is provided with a stop 57 on which the manual lever 52 rests

  when the device is at rest (Figure 9).

26 1 7540

  1 1 This decompression system can work

  either automatically or manually.

  Automatic operation (Figures 10 to 14) The action of the foot on the kick pedal rotates the cam stop 56 secured to the pedal and its shaft 6, in the direction of arrow G in Figure 10. The part protruding 56a of the cam stop 56 then comes into contact with the end 49a of the pawl 49, which by means of its stop 49b rotates the automatic lever 45 around its axis 46, the aforementioned parts then coming into the position of Figure 11. During its tilting, the lever 45 therefore exerts traction on

  the engine decompression control cable 48.

  From a certain angle of rotation of the kick pedal, the active part 56a of the cam stop 56 exceeds the pawl 49 (Figure 12) and the lever and the pawl 49 return to their initial position, under the action in particular the responsibility of

  the decompressor valve 43 (Figure 8) through the

  through the decompressor cable 48.

  The rotation of the kick pedal continues until its end, then the return spring 12 brings it back to its starting position. During this return stroke, the protruding part 56a of the cam stop 56 causes the pawl 49 (Figure 13) to toggle which is then returned to its previous position by

spring 51 (Figure 10).

  Manual operation (Figure 14): Manual action on lever 40. (Figure 8) of decompressor on the handle causes traction on the cable 53 and rotation of the manual lever 52

around axis 46.

2 6 1 7 5 4 0

  The lever 52 then exerts on the stop 57 a thrust which causes the automatic lever 45 to rotate, also around the axis 46, this lever 45 then exerting traction on the decompressor target 48. When the traction on the manual control target 53 ceases, the levers 52 and 45 as well as the pawl 49 return to their initial position of the

Figure 9.

  The invention has the advantage of using,

  for the starting device, the means of trans-

  existing mission on the vehicle (pulleys 4 and 7 and belt 8). This reduces the size of the starting system while ensuring, thanks to the difference in the diameters of the driving and receiving pulleys 7, a sufficient multiplication ratio between the shaft 6 of

  the start pedal 21 and the crankshaft 2.

  Furthermore, the decompression means illustrated in Figs. 8 to 14., facilitate the starting of the engine by allowing the decompression of the

  combustion, the combination of these decompression means

  sion with the starting system of Figs, 1 to 3 being

particularly advantageous.

  Finally, the embodiments of Figs 4 to 7, combined with that of Figs 1 to 3, have the advantage of

  also make it easier to start engine 3, avoiding

  - both slipping of the belt 8.

Claims (9)

CLAIMS I - Starting device for a two-wheel motorized vehicle, comprising between a motor (3) and a shaft (10) for driving a driving wheel, a transmission with pulleys (4, 7) and belt (8), as well as means provided between a shaft (6) of a starting pedal (21) and a crankshaft (2) of the engine (3), said transmission being formed of a driving pulley (7.) 'integral with the crankshaft ( 2) and a receiving pulley (4) mounted on a shaft (5) capable of driving the drive wheel by means of a clutch (20) and a drive shaft (10 ), characterized in that a pair of gears (9, 11) is arranged between the shaft (6) of the pedal (21) and the shaft (5) of the receiving pulley (4) in order to transmit the rotation of the first shaft (6) to the second (5), which itself drives the receiving pulley (4) and the driving pulley (7) associated with the crankshaft (2) to start the engine (3).   2 - Device according to claim 1, wherein the motor (3) and the drive pulley (7) are mounted on a support (13) oscillating on the chassis (15) of the vehicle, and a spring (16) fixed by its ends to the support (13) and to the frame (15) constantly requests the support so as to maintain a sufficient belt tension, characterized in that means are provided for locking the motor (3) in its normal angular position in order to maintain the tension of the strap   (8) during engine starting.   3 - Device according to claim 2, ca-   characterized in that the said means comprise a cam (17) oscillatingly mounted on the chassis (15), linked by a rod (19) to the receiving pulley (4),   solicited by an elastic member (23) fixed to the frame.   sis (15) so that in the inactive position, said cam (17) is released relative to a stop (24) integral with the oscillating support (13) of the engine, and that the actuation of the pedal (21) starting do   tilt the cam (17) in a position where it co-   father with the stop (24) to prevent the engine (3) and the crankshaft pulley (7) from approaching the   take-up pulley (4), return to its original position   tial of the start pedal (21) automatically returning   matically the cam (17) in its starting position   retracted with respect to the stop (24).   4 - Device according to claim 2, characterized in that said means -comport a   connecting rod (25) linked to the engine (3) to one of its ex-   hoppers and sliding mounted on the chassis (15) at its opposite end, and a cam (28) articulated on the chassis (15), kept disengaged from the connecting rod (25) by the starting system when the latter is at rest, this cam (28) being elastically driven   in a locking position of the connecting rod (25) when   that it is released by actuation of the starting system (21, 21a), and the return of the pedal   start (21) in its initial position doing low   press the cam (28) back into its position   clear of the connecting rod (25).   - Device according to claim 1, wherein the motor (3) and its drive pulley (7) are mounted on a support (13) oscillating on the chassis (15) of the vehicle, characterized in that it comprises means for increasing the tension of the   belt (8) during engine start.   6 - Device according to claim 5, characterized in that said means comprise a 2 6 1 7 5 4 0   rod (32) linked to the shaft (30) of the starting pedal (21), a spring (34) with two branches (35, 36) in V don, the ends are fixed respectively to the support (13) of the engine and to the rod (32), the branch (36) fixed to the rod (32) bearing on the frame (15) when the starting system is at rest and being brought closer to the other branch (35) by the displacement of the rod (32) driven by the rotation of the shaft (30, 33) of the pedal (21) at start-up, which causes an increase in the tension of the belt (8) during start-up.   7 - Device according to one of the claims   tions 1 to 6, characterized in that it further comprises means for decompressing the engine (3) during its start-up.   8 - Device according to claim 7, ca-   characterized in that said decompression means comprise a cam (37) integral with the start pedal (21) and able to cooperate with a lever (38) coupled to a cable (39) for controlling a valve (41) d '' a decompressor (42) during actuation of the start pedal (21), elastic means (44, 43) then automatically recalling the lever (38) and the cable (39) on the one hand, and the valve ( 41)   on the other hand to their original positions.   9 - Device according to claim 8, characterized in that the cable (39) is connected, beyond   from the decompressor (42), to a ma- nuelle (40) of the latter.   10 - Device according to claim -7, characterized in that said means comprise an automatic lever: (45) articulated around an axis (46)   fixed on a support (47) and secured to the end   decompressor cable (48), one pawl 26 1 7540   (49) articulated on said lever (45), returned to a rest position by a spring (51), and adapted to be able to cooperate with a cam stop (56, 56a) integral in rotation with the pedal (21) - starting so that the rotation of the pedal automatically causes a simultaneous rotation of the pawl (49) and the lever (45), the latter then exerting a   pull on the decompressor cable (48).   11 - Device according to claim 1.0, characterized in that it further comprises a lever (52) connected to a cable (53) for manual decompression control, articulated on the support (47) around the same axis (46) as the automatic lever (45), and on   which is fixed one end of the return spring (51)   pel of the pawl (49), and the automatic lever (45) is provided with a stop (57) for supporting the manual lever (52), arranged so that a pull on the target (53) for manual control of decompression switches the manual lever (52) and the automatic lever   (45) by pressing the manual lever on the stop (57) so- lidaire of the automatic lever (45).