CN1067752C - Power transmission device - Google Patents

Abstract

The invention provides a technique which effectively suppresses generating a shock and sound in the case of performing a speed change from a neutral position to the first speed shift position. The technique includes: (a) shows N-1 switching, to large swivel a clutch lever by an amount (A), to deform a braking band into doglegged shape by an extruding pin pressed to a clutch outer, and to apply a brake. (b) shows 1-2-3-4 speed shift switching, hear to generate a swivel amount of the clutch lever in an amount B smaller than the amount A, not to fasten the braking band till effectively applying the brake. Thus by braking only at mode change time to the first speed shift position from a neutral position, since generating a speed change shock can be prevented also to prevent braking in the case of the other mode change, a life of a braking member can be markedly extended.

Description

Power transmitting deice

The present invention relates to a kind of the inhibition effectively from middle position towards the generation vibration of the first velocity location speed change and the technology of voice.

Figure 10 shows an example of motorcycle gear box in the past, it by bent axle 101, start clutch 102, switch clutch 103, main shaft 104, countershaft 105 and output sprocket 106 output power of motor passed to the driving wheel (not shown).Between main shaft 104 and countershaft 105, the gear 110 that comprises claw clutch 111,112 from known is housed.In the present embodiment, starting clutch 102 is centrifugal clutchs, and when the rotating speed of clutch inner member 102a became greater to a certain degree, 102b was connected with the clutch Outside element.On the other hand, switch clutch 103 can close with the switching pedal interlock of driver operation/from (on/off).

During engine start, start clutch 102 and be disengaged position (off), switch clutch 103 is closed state (on).During engine start, bent axle 101 rotations are engaged in sleeve 104 rotation under friction drives on this bent axle 101 loosely, start also and then rotation of clutch Outside element 102b in this state.At this moment, master gear 115, switch clutch 103 and the main think of 104 with gear engagement dallies.That is to say, break away from that the element of drawing oblique line (//) among the figure is then along with bent axle 101 rotations though start clutch 102.

The driver is switched from interposition towards first speed and is scrunched when switching pedal, switch clutch is broken away from, and the claw clutch of aforementioned gear 110 is in engagement, when the switching pedal unclamps, and switch clutch 103 closures.Hereinafter " switching from middle position towards first speed " is called " switch N → 1 " or " switching towards first velocity location " from middle position.

Scrunch when switching pedal, output sprocket 106 is connected with driving wheel by chain not shown in the figures, and driving wheel is in halted state, and countershaft 105 also is in halted state, on the other hand, switch clutch outer member 103b, master gear 115 and the main shaft 104 etc. of cross-hatching are in rotation status.Like this, undesirable vibration can take place in the moment of switch clutch closure.

The technology that is used to eliminate this vibration is, for example, (1) Japanese Utility Model discloses clear 42-5137 communique disclosed " slow the attaching together of the vibrations during gear engagement put " and reaches " slow the attaching together of the impact of change set put " that (2) Japanese Patent Publication 44-4066 communique is disclosed.Promptly, communique in above-mentioned (1) illustrates by Fig. 1, on gear newspaper fork 2, contact disk 3 is installed, brake low speed gear 4 with this contact disk, and the communique in above-mentioned (2) also illustrates by Fig. 1, on cabinet 11 braking plate 12 can be installed with putting, this braking plate 12 drives advance and retreat by cam 13, braking input gear 2 in advancing.

Certainly use the device of above-mentioned (1) (2), when switching in N → 1, owing to utilize braking plate (contact disk, braking plate) to make solid of rotation static, so can not vibrate.

, in the device of above-mentioned (1), when switched in the neutral position, braking plate contacted with low speed gear 4 from first speed.Because low speed gear 4 still is in rotation status, the braking plate that contacts with this solid of rotation will wear and tear, and reduces its life-span.Also there is same defective in above-mentioned (2).

That is to say,, when still 1 → N switches, all brake no matter device in the past is N → 1 when switching, so, the lost of life of braking plate.

For addressing the above problem, the purpose of this invention is to provide a kind of power transmitting deice.

A kind of power transmitting deice of the present invention, by being provided with in the middle of having at least, the gear of first velocity location, the output of power source is passed to driving wheel, from aforementioned gear to the power source is input shaft system, it from the gear to the driven wheel side output shaft system, aforementioned gear is under the state of neutral position, aforementioned input shaft is to rotate with the rotation of power source output shaft, it is characterized in that, this power transmitting deice also comprises braking timing mechanism and brake member, aforementioned braking timing mechanism is made of speed change principal arm and brake arm, the speed change principal arm can along from middle position towards first velocity location and the reversible swing of the swaying direction from first velocity location towards the neutral position, brake arm allow the speed change principal arm from middle position when the first velocity location mode of carrying out is switched, the oscillating quantity of switching than alternate manner is bigger, described input shaft system is controlled in aforementioned brake member and the acting in conjunction of speed change principal arm, the switch clutch of the friction clutch form that input shaft system is cut off from driving source when aforementioned input shaft system has startup clutch that the automatic centrifugal clutch that sets gradually along the transmission of power direction forms and variable speed operation.

On the speed-changing drum of gear, cam is installed, makes from middle position the brake arm oscillating quantity when the first velocity location mode of carrying out is switched and carry out between the brake arm oscillating quantity of alternate manner when switching difference being arranged.

Aforementioned brake member is made of clutch shaft and brake shoe, and clutch shaft is made identical swings by main shaft and speed change principal arm, brake shoe be installed in clutch shaft on the clutch Outside element of startup clutch play braking action when contacting.

Aforementioned brake member is made of clutch shaft, swing sheet and brake shoe, clutch shaft is made identical swings by main shaft and speed change principal arm, the swing sheet is installed on the clutch shaft, can along with the clutch Outside element sense of rotation opposite direction swing that starts clutch, brake shoe has input side corner part and the outlet side corner part that sets gradually along the sense of rotation of aforementioned clutch outer member, and be installed in make aforementioned input side corner part earlier with swing sheet that the aforementioned clutch outer member contacts on.

In addition, aforementioned brake member is installed in the push rod on this clutch shaft by the clutch shaft of doing same swing by main shaft and speed change principal arm, utilizes its braking that contacts with the clutch Outside element that starts clutch that makes of this push rod extruding to constitute with band.

Only to braking when the first velocity location mode of carrying out is switched from middle position, therefore, the vibration in the time of can preventing speed change takes place the braking timing mechanism.And when carrying out the alternate manner switching, do not brake, so prolonged the life-span of brake member.

Owing to when the gear graduation structure engages, relax the switching vibration that is taken place, be effective with other switch clutch so the startup clutch is set.But, be the increase of inertial mass owing to start the later input shaft of clutch, so can worry to vibrate when switch clutch connects.Therefore to braking from starting clutch to the driving system of switch clutch.In addition, brake latency is carried out after the gear release again, so the engagement of claw clutch easily realizes.

Be used for gear graduation and the shape of standing speed change principal arm can be carried out various variations, can on this speed change principal arm, assist brake arm is set, make it simple in structure, and can realize only to the autotelic braking of common gear shifting operation.

Brake arm is by the cam swing that is arranged on the speed-changing drum, the oscillating quantity that this swing makes from middle position brake arm when the first velocity location mode of carrying out is switched during with the alternate manner switching oscillating quantity of brake arm difference is arranged.

The main shaft rotation during clutch shaft swing, makes the direction extruding of brake shoe towards the clutch Outside element, realizes braking.

The main shaft rotation during clutch shaft swing, contacts earlier brake shoe input side corner part with the clutch Outside element, realize braking effectively.

When main shaft rotation, clutch shaft swing, make braking, realize braking with the outer member direction pushing of band towards clutch.

Fig. 1 is power transmitting deice of the present invention (first embodiment's) first profile.

Fig. 2 is power transmitting deice of the present invention (first embodiment's) second profile.

Fig. 3 is power transmitting deice of the present invention (first embodiment's) the 3rd profile.

Fig. 4 is the N → 1 switch motion explanatory drawing of first embodiment of the invention.

Fig. 5 is the action specification figure that 1 → 2 → 3 → 4 speed of first embodiment of the invention are switched.

Fig. 6 is power transmitting deice of the present invention (second embodiment's) first profile.

Fig. 7 is the Action Specification figure of Fig. 6.

Fig. 8 is power transmitting deice of the present invention (the 3rd embodiment's) first profile.

Fig. 9 is the Action Specification figure of Fig. 8.

Figure 10 is the schematic representation of an example of motorcycle gear box in the past.

Among the figure: the 1-power transmitting deice, the 2-crankcase, 3-starts clutch, 5-clutch Outside element, the 7-main shaft, the 8-clutch shaft, 9-constitutes the brake shoe of brake member, 10-brakes timing mechanism, 11-speed change principal arm, the 12-shifting arm, the 15-brake arm, 17-first recess, 18-second recess, 19-cooperates case, the 24-speed-changing drum, 25-cam (speed-changing drum cam), the small diameter portion of 26-cam, the major diameter part of 27-cam, the 29-gear shift pedal, 31-constitutes the swing sheet of brake member, the 32-torsion spring, 41-constitutes the braking of brake member with being with, the 45-push rod, the 101-bent axle, the 103-switch clutch, the 110-gear shift, 111, the 112-claw clutch.

Accompanying drawings embodiments of the invention hereinafter.

Power transmitting deice 1 of the present invention illustrates respectively with corresponding accompanying drawing 1-3 respectively, equally timing mechanism 10 usefulness Fig. 2 of the present invention, Fig. 3 is described respectively.

Embodiments of the invention are that power transmitting deice with Figure 10 structure is a prerequisite, in Figure 10, from gear shift 110 to the power source is input shaft system, from gear shift 110 to driven wheel side is output shaft system, gear shift 110 is under the state of neutral position, and aforementioned input shaft is to rotate with the rotation of power source output shaft.

Fig. 1 is power transmitting deice of the present invention (first embodiment's) first profile, is equivalent to (but only put down in writing critical piece from the perspective view that Figure 10 clutch shaft 116 sides are seen.Hereinafter the same).

Be equipped with in crankcase inside and start clutch 3 (constituting), the main shaft 7 that extends towards the figure the inside along its length, be installed in the clutch shaft 8 on the main shaft 7 by spline and be installed in brake shoe 9 on this clutch 8 by clutch inner member 4 machine outer members 5.This clutch shaft 8 constitutes brake member with brake shoe 9.

Can clearly be seen that from figure, is that swing toward the clockwise direction at the center by clutch shaft 8 with main shaft 7, just brake shoe 9 can be pressed towards the direction heap of clutch Outside element 5.Consequently clutch Outside element 5 is braked.

Fig. 2 is power transmitting deice of the present invention (first embodiment's) second profile, from the schematic representation of seeing than Fig. 1 inboard more inwardly.

The upright arm 11 of speed change of the lengthwise that constitutes braking timing mechanism 10 critical pieces is installed on aforementioned main shaft 7, the top of the upright arm 11 of this speed change is installed in the base portion of shifting arm 12 by bearing pin 13, the brake arm 15 of growing crosswise on the other hand, is being installed on the crankcase 2 around the mode of bearing pin 16 swings.

The structure of above-mentioned speed change principal arm 11 is, form in its side first recess 17 and than first recess 17 more the source second recessedly cut open 18, be meshed with this first and second recess 17,18 with the bearing pin 19 (extending) that the front end of above-mentioned brake arm 15 cooperates, the 21st towards the figure the inside, extension spring is pulled brake arm 15 above figure.

The substantial middle portion of aforementioned brake arm 15 is provided with roller 22, contacts with the cam 25 that is installed in speed-changing drum 24 1 ends.Speed-changing drum cam 25 is simple utmost point cam as shown in the figure, and its major diameter part protrudes out setting from minor diameter 26.The 28th, star plate has five grooves in this embodiment, and the roller shown in the figure is squeezed on any one groove, can suppress the idle running of speed-changing drum 24.

Fig. 3 is the 3rd profile (first embodiment) of power transmitting deice of the present invention, it is the view of seeing from than Fig. 2 inside, aforementioned shifting arm 12 has the first pawl 12a and the second pawl 12b that is positioned at its front end, being convexly equipped with the 1st to the 5th bearing pin 24a-24e on speed-changing drum 24 pushes with above-mentioned any monodactyle or is pulled, for example, the driver steps on the anterior 29a of pedaling gear shift pedal 29 with the left foot toe, and (among the figure, owing to the right side from car body, figure the right is the place ahead.Fig. 1,2 same) time, speed change principal arm 11 with dashed lines in the figure is swung near the represented position.At this moment, the first pawl 12a of shifting arm 12 forces to move towards the position of Fig. 4 first bearing pin 24a towards the second bearing pin 24b that is pulled of direction shown in the arrow (1).When gear shift pedal 29 pedaling actions were cut off, under the effect of speed change principal arm 11 torsion springs shown in the figure, the position represented towards solid line automatically reset.Shifting arm 12 also returns towards the position shown in the solid line, at this moment, because the conical surface 12c of shifting arm 12 through the slip underneath of the second bearing pin 24b, therefore, does not worry squeezing and is sold back to a grain-producing area a 24a, 24b.

Utilize above-mentioned main points, when returning the anterior 29a that scrunches gear shift pedal 19 again, can realize the switching of N (centre) → 1 speed → 2 speed → 3 speed → 4 speed of speed-changing drum 24.And, when returning the rear portion 29b that scrunches gear shift pedal 29 again, speed change principal arm 11 is swung towards the counterclockwise direction on the figure, utilize as the crowded first bearing pin 24a of the opposite thruster of second pawl 12b court with arrow (1), carry out return action.As a result, realize the switching of 4 speed → 3 speed → 2 speed → 1 speed → N (centre).

By above explanation, speed change principal arm 11 is for making the intermittently employed in the past parts of rotation of speed-changing drum 24, in the present embodiment, be provided with first and second recess 17,18 on these parts, and brake arm 15 (with reference to Fig. 2) only having been done change to its shape.

Hereinafter the effect by above first embodiment who constitutes is described.

Fig. 4 (a) and (b) are action specification figure that the N → 1 of first embodiment of the invention switches, among the figure (a), in N → 1 process, the major diameter part 27 of speed-changing drum cam 25 with brake arm 15 to depress largely.Thus, make speed change principal arm 11 produce bigger swing from the position shown in its dotted line towards the position shown in the solid line.That is to say, till directly swinging to the bearing pin 19 that second recess 18 washed and brake arm 15 front ends are cooperated and contacting.At this moment oscillating quantity is represented with A, also carries out bigger swing and scheme (b) middle clutch shaft 8, makes the direction extruding of brake shoe 9 towards clutch Outside element 5, realizes braking.

Thus, when switch N → 1, when changing the closed state of clutch, can not produce vibrations.And, owing to can after the claw clutch engagement finishes, brake, so, can realize the steady engagement of claw clutch.

Fig. 5 (a) and (b) are switch motion explanatory drawings of 1 → 2 → 3 → 4 speed of first embodiment of the invention, in the handoff procedure of 1 → 2 → 3 → 4 speed of scheming (a), the small diameter portion 26 of speed-changing drum cam 25 is depressed roller 22, can make the speed change principal arm 11 that is in position shown in the dotted line swing to the position shown in the solid line thus.That is to say, first recess 17 than second recess, 18 lines contacts with the bearing pin 19 that brake arm 15 front ends are cooperated, and swing at this moment finishes, and the oscillating quantity of this moment is B, brake shoe 9 among the figure (b) swings only to and clutch Outside element 5 gapped positions, does not produce braking.

On the other hand, in the switching of 4 → 3 → 2 → 1 → N that does not show in the drawings, clutch shaft 8 does not produce braking towards the opposition side swing of braking.

Thus, when first embodiment's power transmitting deice only switches in N → 1 input shaft system is braked, and when 1 → N switches, do not brake.

Fig. 6 is power transmitting deice of the present invention (second embodiment's) first profile.And second embodiment's second profile is identical with Fig. 2, and the 3rd profile is identical with Fig. 3, so save its description.And consistent with Fig. 1 same structure part symbol, save explanation.

In a second embodiment, brake shoe 9 peace shapes are on swing sheet 31, and this swing sheet 31 can be towards the gyratory directions swing opposite with clutch Outside element 5 sense of rotation, and it is installed on the clutch shaft 8, and under the effect of torsion spring 32 in the figure position return.33, the 34th, uprightly be arranged on the bearing pin on the clutch shaft 8.

The turning of brake shoe 9 is according to the sense of rotation of clutch Outside element 5 called after input side corner part 9a and outlet side corner part 9b successively.

Fig. 7 (a) and (b) are Action Specification figure of Fig. 6, (c) are the schematic representation of comparative example, and when (a) clutch shaft 8 in was swung along clockwise direction, the input side corner part 9a of the brake shoe 9 that illustrates by (b) contacted with clutch Outside element 5 at first.

If as figure (c), when outlet side corner part 9b contacted with clutch Outside element 5 earlier, clutch Outside element 5 will bump outlet side part 9b, thereby undesirable braking action takes place.Promptly in the occasion of (c), extruding force increases.Given this, second embodiment's brake shoe 9 is designed to the contact position of clutch Outside element 5, produces braking action when sense of rotation moves, and therefore, will produce the form of good braking action with the smaller power of scrunching.

Fig. 8 is power transmitting deice of the present invention (the 3rd embodiment's) first profile.The 3rd embodiment's second profile is identical with Fig. 2, and the 3rd profile is identical with Fig. 3, its explanation of Therefore, omited.In addition, consistent with the sequence number of Fig. 1 same structure part, omission is described.

The 3rd embodiment's characteristics are to adopt the band brake mode.Braking is installed on the crankcase 2 with pin 42,43 with the two ends with 41, and is in this state, gapped with clutch Outside element 5.

On the other hand, on clutch shaft 8, uprightly be provided with extruding or pushing braking with 41 push rod 45.

Fig. 9 (a) and (b) are Action Specification figure of Fig. 8, and when switched N shown in (a) → 1, because clutch shaft 8 is swung big (A), push rod 45 made braking with being with 41 to produce "＜" distortion, pushes towards clutch Outside element 5 directions.Outer member 5 is stopped.

(b) be the switching schematic representation of 1 → 2 → 3 → 4 speed, at this moment, the oscillating quantity of clutch shaft 8 is B, and is littler than A, and braking usefulness is in effective braking state before with 41, and unfettered.

The structure that the brake member of first aspect present invention also can adopt the 3rd, 4 or 5 aspects to put down in writing, but be not limited to this can as long as can produce the parts of braking action to input shaft system.Equally, the braking timing mechanism also is not limited to the structure that the 2nd aspect is put down in writing, if from middle position when the first velocity location mode of carrying out is switched, only making aforementioned brake member produce the mechanism of braking action can.

Brake member in the first aspect can as long as can produce the parts of braking action to the driving system from the startup clutch to switch clutch.

The cam swing that the brake arm of first aspect utilizes second aspect to put down in writing, but be not limited to this, can also adopt linkage mechanism, electromagnetism etc. to make its swing.

The present invention adopts said structure to have following effect.

In first aspect, because the braking timing mechanism is only from middle position towards First Speed Produce braking in the process that the position mode of carrying out is switched, therefore, can prevent velocity shock Take place. And when alternate manner switches, do not brake, so improved significantly detent The life-span of part.

In first aspect, because to the drivetrain system from the startup clutch to switch clutch Moving, and brake latency carries out after the gear release, so, prevented change The engagement of jaw clutch is guaranteed in the generation of speed vibration simultaneously.

In first aspect, the shape of standing speed change principal arm can owing to be used for gear graduation To carry out various variations, also can assist at this speed change principal arm brake arm is set, consist of with this The braking timing mechanism is so mechanism is simple and can realize that relatively common gear shifting operation has order Braking.

In second aspect, because brake arm is with the cam swing that is installed on the speed transmission drum , need not prepare extra drive unit, so, consisted of cheap brake arm and driven Device.

In the third aspect, the main shaft rotation is during the clutch lever swing, outside clutch The direction extruding brake scotch of section's element is realized braking, and therefore, the brake component miniaturization takes With low.

In fourth aspect, by means of the rotation of main shaft, the swing of clutch lever makes The position that contacts with the clutch Outside element, one faces direction of rotation moves, and one side produces system Moving, therefore, the available smaller power that scrunches realizes good braking.

In aspect the 5th, when main shaft rotation, clutch lever swing, outside clutch Section's component orientation extruding braking realizes braking with band, and therefore, brake area is big, and braking is steady Fixed.

Claims (5)

1. power transmitting deice, gear by setting, first velocity location in the middle of having at least, the output of power source is passed to driving wheel, from aforementioned gear to the power source is input shaft system, is output shaft system from the gear to the driven wheel side, and aforementioned gear is under the state of neutral position, aforementioned input shaft is to rotate with the rotation of power source output shaft, it is characterized in that this power transmitting deice also comprises braking timing mechanism and brake member

Aforementioned braking timing mechanism is made of speed change principal arm and brake arm, the speed change principal arm can along from middle position towards first velocity location and the reversible swing of the swaying direction from first velocity location towards the neutral position, brake arm allow the speed change principal arm from middle position when the first velocity location mode of carrying out is switched, the oscillating quantity of switching than alternate manner is bigger

Described input shaft is controlled in aforementioned brake member and the acting in conjunction of speed change principal arm,

The switch clutch of the friction clutch form that input shaft system is cut off from driving source when aforementioned input shaft system has startup clutch that the automatic centrifugal clutch that sets gradually along the transmission of power direction forms and variable speed operation.

2. power transmitting deice according to claim 1, it is characterized in that, on the speed-changing drum of gear, cam is installed, makes from middle position the brake arm oscillating quantity when the first velocity location mode of carrying out is switched and carry out between the brake arm oscillating quantity of alternate manner when switching difference being arranged.

3. power transmitting deice according to claim 1, it is characterized in that, aforementioned brake member is made of clutch shaft and brake shoe, clutch shaft is made identical swings by main shaft and speed change principal arm, brake shoe be installed in clutch shaft on the clutch Outside element of startup clutch play braking action when contacting.

4. power transmitting deice according to claim 1, it is characterized in that, aforementioned brake member is by clutch shaft, swing sheet and brake shoe constitute, clutch shaft is made identical swings by main shaft and speed change principal arm, the swing sheet is installed on the clutch shaft, can be along swinging with the opposite direction of the clutch Outside element sense of rotation that starts clutch, brake shoe has input side corner part and the outlet side corner part that sets gradually along the sense of rotation of aforementioned clutch outer member, and be installed in make aforementioned input side corner part earlier with swing sheet that the aforementioned clutch outer member contacts on.

5. power transmitting deice according to claim 1, it is characterized in that, aforementioned brake member by the clutch shaft of doing same swing by main shaft and speed change principal arm, be installed in push rod on this clutch shaft, utilize its braking that contact with the clutch Outside element that starts clutch that makes of this push rod extruding to be constituted with being with.

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