JP2003056435A - Kick starter for motorcycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a kick starter that permits a kick start of a motorcycle only in neutral, enables recognition of a shift position other than neutral via a light kick action by eliminating large resistance on a foot in a shift position other than neutral, is structurally simple, has a small number of parts, and is inexpensive. SOLUTION: A starting clutch connects and disconnects a kick lever shaft 5 and a starting gear 43 via a movement of a clutch element 45. A lock lever 52 abutting on a change drum 7 actuated by a rotation of the change drum 7 is arranged in a change gear chamber 2. When the change drum 7 is in a shift position other than neutral, the lock lever 52 locks the clutch element 45 in a declutching position. When the neutral position is selected, the lock lever 52 unlocks the clutch element 45 to permit a start. The lock lever 52 is, for example, turnably supported on a transmission output shaft 4 in the change gear chamber 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a kick type starting device for a motorcycle, and more particularly to a kick type starting device suitable for a motorcycle having a centrifugal clutch as a rear wheel driving force transmitting clutch.

[0002]

2. Description of the Related Art In a kick-type starter for a motorcycle equipped with a centrifugal clutch for transmitting rear wheel drive force, a kick start is usually possible at any shift position. Immediately after the engine is started, if the accelerator is blown to check the engine condition, when the engine is started at a position other than the neutral position, the accelerator operation should be performed by a fixed amount (rotation) to prevent the centrifugal clutch from being engaged due to excessive blowing. The amount of movement must be kept below. That is, since the accelerator operation immediately after the start is limited, it is necessary to get used to the accelerator operation immediately after the start.

Also, in a kick type starting device for a motorcycle equipped with a multi-plate friction clutch instead of the centrifugal clutch, the clutch lever can be started at a shift position other than neutral, but the clutch lever can be held. If you start the kick at a position other than neutral with forgetting it, an attempt will be made to apply a rotational force to the grounded wheel, so an excessive force will be applied to the start gear or transmission gear, Not only will this cause premature wear, but the resistance on the rider's feet will be great, which will interfere with the starting operation.

In order to prevent these, there is a kick-type starter that controls ignition so that ignition does not occur at shift positions other than the neutral position. However, the ignition device must be modified to equip a controller, etc. Becomes higher. In addition, as a prior art document of a kick-type starter,
Japanese Utility Model Laid-Open No. 63-7282 or Patent 312744
No. 6 publication and the like.

[0005]

SUMMARY OF THE INVENTION The object of the present invention is to prevent a kick start by means other than neutral by mechanical means, so that the engine condition can be checked immediately after the start of the engine, so that the engine can be idle without overdoing it. It is also an object of the present invention to provide an inexpensive kick-type starter which has a simple structure and a small number of parts.

[0006]

In order to solve the above-mentioned problems, the invention according to claim 1 of the present application is directed to a kick of a motorcycle provided with a starting clutch for connecting and disconnecting a kick lever shaft and a starting gear by movement of a clutch body. In the automatic starter, a lock lever that engages with the change drum and is operable by rotation of the change drum is arranged in the transmission gear chamber, and when the change drum is in a shift position other than neutral, the lock lever disengages the clutch body. The clutch body is locked in the position, and the clutch body is unlocked by the lock lever when in the neutral position.

As a result, even if a centrifugal clutch for transmitting rear wheel driving force is provided, the engine condition can be checked by idling the accelerator without having to take care not to connect the centrifugal clutch immediately after starting. it can. Further, since the change drum is used, neutral and other gear shift positions can be easily detected, and a new component added to the conventional gear shift chamber is a lock lever and a shaft supporting the lock lever. The number of parts is small, cost can be saved, and the appearance around the crankcase does not become complicated and does not increase in size.

[0008] Further, at a gear position other than neutral,
Since the clutch body is locked in the clutch disengaged position, even if the kick operation is performed at a gear shift position other than neutral, the starter clutch is disengaged, so the rider's foot does not receive a large resistance and the kick lever It is possible to perform a stepping-down operation and recognize that the shift position is other than neutral.

According to a second aspect of the present invention, in the kick type starting device for a motorcycle according to the first aspect, the lock lever is rotatably supported by the shaft in the speed change gear chamber, and one end of the lock lever is in contact with the surface of the change drum. The change drum has a convex portion or a concave portion that engages with one end portion of the lock lever when in the neutral position. Thus, the operation of the change drum can be detected quickly and the clutch body can be locked with a simple structure.

According to a third aspect of the present invention, in the kick starting device for a motorcycle according to the second aspect, the lock lever is rotatably supported by the speed change shaft. This can further reduce the number of new members for the lock mechanism.

According to a fourth aspect of the invention, in the kick starting device for a motorcycle according to the second aspect, the lock lever is rotatably supported by the shift fork shaft. This can further reduce the number of new members for the lock mechanism.

[0012]

[First Embodiment of the Invention] [Internal Structure of Transmission Gear Chamber] FIG. 1 is a vertical sectional side view (cross-sectional view taken along line II in FIG. 3) of a transmission gear chamber of a motorcycle to which the present invention is applied. In the formed transmission gear chamber 2, a transmission input shaft 3 and a transmission output shaft 4 are arranged at intervals in the front and rear, and a kick lever shaft 5 is arranged below the rear transmission output shaft 4 to provide the above-mentioned transmission. A change drum 7 is arranged above the intermediate portion between the input shaft 3 and the speed change output shaft 4, and a pair of shift fork shafts 8 and 9 are arranged in front of and behind the change drum 7. Variable speed input shaft 3
Although not shown in the figure, it is discontinuously interlocked with the crankshaft via a centrifugal clutch arranged on the right side of the crankcase 1.

FIG. 3 is a sectional development view taken along line III-III of FIG.
The speed change output shaft 4 has a first speed gear 1 on the output side as a speed change gear.
1, an output side second speed gear 12, an output side third speed gear 13 and an output side fourth speed gear 14 are arranged. The second speed gear 12 is formed integrally with the speed change output shaft 4, and the first speed gear 11 and the third speed gear The gear 13 is fitted to the shift output shaft 4 so as not to move in the axial direction but to be rotatable. The fourth speed gear 14 is formed integrally with the shift sleeve 16, is disposed between the first speed gear 11 and the third speed gear 13 in the axial direction, and is spline-fitted to the shift output shaft 4 so as to be movable in the axial direction. Engagement recesses 19, 20 of the first speed gear 11 and the third speed gear 13 are provided at both axial ends of the shift sleeve 16.
Dog claws 21 and 22 are formed so as to be engageable with each other, and by shifting the shift sleeve 16 in the axial direction, a shift between the first speed gear 11 or the third speed gear 13 and the speed change output shaft 4 is performed. It is designed so that it can be intermittently switched on and off.

The left end of the variable speed output shaft 4 is the crankcase 1
The output chain sprocket 24 is fixed to the left end of the output chain sprocket 24. The output chain sprocket 24 is interlockingly connected to the driven chain sprocket of the rear wheel via the conductive chain.

A shift fork 27 is engaged with an outer peripheral annular groove 25 formed in the shift sleeve 16, and the shift fork 27 is fitted to the rear shift fork shaft 9 so as to be movable in the axial direction. Drive pin 28 of
Shift cam groove 30 formed on the surface of the change drum 7
The shift fork 27 is moved in the axial direction by the rotation of the change drum 7.
The change drum 7 is formed with another shift cam groove 31 together with the shift cam groove 30. The shift cam groove 31 has a shift fork (not shown) fitted to the shift fork shaft 8 on the front side in FIG. I am fit.

In FIG. 3, the change drum 7 is rotatably supported by the crankcase 1, and a drive member 35 having a change pin 34 is connected to the change drum 7 as is well known. The change arm 36 is configured to rotate by a predetermined angle.

[Kick-Type Starting Device] FIG. 4 is a sectional view corresponding to the sectional view taken along the line III-III of FIG. 1 similarly to FIG. 3, but showing only around the kick kick lever shaft 5, and the kick lever is shown. The shaft 5 is rotatably supported by the left end wall of the crankcase 1 and the right clutch case 6, and the right end of the kick lever shaft 5 penetrates the clutch case 6 and projects rightward, and the kick lever 38 is fixed. Has been done. A return spring 40 is engaged with the kick lever shaft 5, and the return spring 40 causes the kick lever shaft 5 to rotate in the forward rotation direction X.
The kick lever 38 is biased in the direction X2 opposite to the direction 1 and holds the kick lever 38 at the return position.

A starter gear 43 is rotatably fitted to the kick lever shaft 5 portion in the speed change gear chamber 2 so as not to move in the axial direction, and the power between the starter gear 43 and the kick lever shaft 5 is interrupted. As a starting clutch, a jump ratchet type engagement clutch including a clutch body 45 and the like is provided.

The starter gear 43 is usually operatively connected to the crankshaft via an appropriate idle gear different from the transmission gear,
The kick rotational force at the time of starting is transmitted to the crankshaft, but in the present embodiment, the gearshift is used to interlock with the crankshaft. For example, the starting gear 43 always meshes with the output-side first speed gear 11, and the first speed gear 1
Although power is transmitted from the starting gear 43 side to the crankshaft by interlockingly connecting to the crankshaft via 1 and the input side first speed gear or an idle gear that meshes therewith, and interposing a one-way clutch or the like in the middle, Power is not transmitted from the crankshaft side to the first speed gear 11 side and the like.

The clutch body 45 is spline-fitted to the kick lever shaft 5 so as to be movable in the axial direction, and always rotates integrally with the kick lever shaft 5. The start gear 43 and the clutch body 45 are opposed to each other at their end faces. Ratchet teeth 43a, 45a for transmitting only the rotational force in the forward rotation X1 direction from the clutch body 45 to the starting gear 43 are formed in the respective. By moving the clutch body 45 in the direction of the arrow Y1 by the stroke S from the clutch disengaged position Q0 to the clutch engaged position Q1, both ratchet teeth 43a, 45a.
Engage with each other, and the kick torque is transmitted from the kick lever shaft 5 to the starting gear 43.

The clutch spring 4 is provided on the left side of the clutch body 45.
7, the clutch spring 45 urges the clutch body 45 in the direction of the arrow Y1. The clutch body 45 is integrally formed with a stopper 48 projecting outward in the radial direction. A start guide 49 is fixed to a mounting base 50 formed on the crankcase 1, and the stopper 48 contacts the start guide 49 to hold the clutch body 45 at the clutch disengagement position Q0 in the axial direction. .

In FIG. 1, the rotation range of the stopper 48 of the clutch body 45 is from the rotation start point position indicated by the reference symbol P0 to the rotation end point position indicated by the reference symbol P2, and the start guide 49 is the above rotation range of the stopper 48. Among them, it is arranged so as to cover a certain range near the rotation start point position P0.

FIG. 5 is a development view of the VV section of the start guide 49 shown in FIG. 1. The end portion of the start guide 49 on the forward rotation X1 direction side has an inclined portion 49 that bends in the axial Y1 direction.
a is formed. That is, when the stopper 48 is at the rotation start position P0, as described above, the start guide 4
The clutch is disengaged at the clutch disengaged position Q0 by being locked at 9, but when the clutch body 45 rotates in the forward rotation X1 direction, the inclined portion 49a is generated by the biasing force of the clutch spring 47.
Along the arrow Y1 to reach the clutch engagement position Q1 at the rotation position P1 and rotate from the rotation position P1 to the rotation end position P2 while maintaining the clutch engagement position Q1.

After the start, the return spring 40 shown in FIG.
Causes the rotation end position P2 in FIG. 5 to return in the X2 direction,
The inclined position 49a guides the rotation position P1 to return to the clutch disengagement position Q0 at the rotation start point position P0.

[Clutch Body Locking Mechanism] Referring to FIG. 3, as a mechanism for locking the clutch body 45 at the clutch disengagement position Q0 in the axial direction, a lock lever 5 is attached to the shift output shaft 4.
2 is rotatably supported, one arm of the lock lever 52 extends upward, its upper end 52a abuts the surface of the change drum 7, and the other arm of the lock lever 52 extends downward. The lower end portion 52b is engaged with the outer peripheral annular groove 55 formed in the clutch body 45 so as to be disengageable.
The axial support position of the lock lever 52 on the shift output shaft 4 is between the output side third speed gear 13 and the output side second speed gear 12, and the upper end portion 52a is in the vicinity of the left end portion of the change drum 7. On the other hand, the lower end portion 52b is bent stepwise rightward in the axial direction, and then the outer peripheral annular groove 55 of the clutch body 45 is contacted.
Is engaged with.

In FIG. 2, the lock lever 52 is provided with a return spring 56 stretched between the lock lever 52 and the upper end of the start guide 49 so that the transmission output shaft core O1 is shifted.
It is urged in the direction of the arrow R1 so that the upper end 52a of the lock lever 52 is constantly pressed against the rear side of the surface of the change drum 7.

On the surface of the change drum 7, a crescent-shaped notch 53 is formed on the same circumference as the axial position where the upper end portion 52a of the lock lever 52 comes into contact, and the notch 53 is The change drum 7 is formed at a position that engages with the lock lever upper end portion 52a when the change drum 7 is in the neutral position.

When the lock lever 52 is in contact with the surface of the change drum other than the notch 53 as shown in FIG. 2 (at a shift position other than neutral), the lock lever 52 rotates in the direction of arrow R2 and the lower end portion thereof is rotated. 52b is the outer peripheral annular groove 5 of the clutch body 45.
5, so that the clutch body 45 is locked at the clutch disengagement position Q0 in FIG. On the other hand, as shown in FIG. 1, when the cutout 53 of the change drum 7 is engaged with the upper end portion 52a of the lock lever 52 (at the neutral position), the lock lever 52 rotates in the arrow R1 direction. The lower end portion 52b of the lock lever 52 is disengaged from the outer peripheral annular groove 55 of the clutch body 45 outward in the radial direction to unlock the clutch body 45.

FIG. 7 is a development view of the surface of the change drum 7. The notch 53 is formed separately from the shift cam grooves 30 and 31 at a position displaced axially to the left from the shift cam grooves 30 and 31. There is.

[0030]

[Kick start at neutral position] By operating the change pedal to set the change drum 7 to the neutral position as shown in FIG. 1, the upper end portion 52a of the lock lever 52 is engaged with the notch 53, and the lock lever 52 is locked.
The lock of the axial position of the clutch body 45 by the lower end portion 52b of the is released. When the kick lever 38 of FIG. 4 is stepped down in the neutral state, the kick lever shaft 5 and the clutch body 45 rotate in the forward rotation X1 direction against the return spring 40.

In the rotation in the forward rotation X1 direction, as shown in FIG.
While the stopper 48 moves from the rotation start point position P0 to the rotation position P1 as described above, the clutch body 45 biased by the clutch spring 47 is guided by the inclined portion 49a to the clutch connection position Q1 and the starting clutch is opened. Connecting. After the start clutch is connected, the kick torque is transmitted from the start gear 43 in FIG. 3 to the output side first speed gear 11 by rotating from the rotation position P1 in FIG. 1 to the rotation end position P2, and the crankshaft is driven. And start.

After starting, the kick lever shaft 5 and the clutch body 45 are moved by the return spring 40 to the rotation end position P of FIG.
2 from the rotational position P1 to the inclined portion 4
Guided by 9a, it axially retreats to the clutch disengagement position Q0 in FIG. 3 and returns to the rotation start point position P0, and the starting clutch is disengaged.

[Kicking at a shift position other than neutral] When the change drum 7 is at a shift position other than neutral as shown in FIG. 2, the lower end portion 52a of the lock lever 52 has an outer peripheral annular groove of the clutch body 45. 55, and the axial position of the clutch body 45 is locked at the clutch disengagement position Q0 in FIG. When the kick lever 38 is stepped down at a shift position other than such a neutral position,
The kick lever shaft 5 and the clutch body 45 rotate in the forward rotation X1 direction, and the stopper 48 also rotates from the rotation start position P0 to the rotation final position P2 in FIG. 2, but as described above, the axial position of the clutch body 45 changes. Since it is locked, the axial position is kept at the clutch disengagement position Q0 even if the final rotation position P2 is reached as shown in FIG. 6, and the starting clutch is not engaged.

That is, the stepping-down operation of the kick lever can be performed without receiving a large resistance, but the crankshaft is not driven and the engine is not started.

[0035]

Embodiment 2 of the Invention FIG. 8 is an example applied to a transmission gear mechanism in which one shift fork shaft 9 and a change drum 7 are arranged below a transmission input shaft 3 and a transmission output shaft 4.
A lock lever 72 is rotatably supported on the shift fork shaft 9 arranged close to the change drum 7.

One arm of the lock lever 72 extends rearwardly, a rear end portion 72b of the lock lever 72 engages with the outer peripheral annular groove 55 of the clutch body 45 from below so as to be freely engageable and disengageable, and the other arm extends shortly downward. The front end 72a of the lever is in contact with the rear side of the surface of the change drum 7, and is biased in the direction of arrow R1 by the weight of the lock lever 72. In this way, the return spring is omitted by utilizing the weight of the lock lever 72 as a biasing force.

The structure other than the shape of the lock lever 72 and the supporting structure as described above is basically the same as that of the first embodiment shown in FIGS. 1 to 4, and the same reference numerals are given to the parts having the same functions and the same names. Is attached.

The operation of the lock lever is basically the same as that of the first embodiment shown in FIGS. 1 to 4, and when the change drum 7 is in the shift position other than the neutral position, the lock lever 72 is operated.
Rotates in the direction of arrow R2 and the rear end portion 72b moves to the clutch body 4
5, the axial position of the clutch body 45 is locked at the clutch disengagement position. On the other hand, when the change drum 7 is in the neutral position, the notch 5
When the front end 72a of the lock lever 72 engages with the lock lever 72, the lock lever 72 rotates in the direction of arrow R1 and the rear end 72b disengages from the annular groove 55 of the clutch body 45, so that the clutch body 45 is locked. It is released and you can start kicking.

[0039]

[Other Embodiments] (1) In addition to the structure using a shift shaft as shown in FIG. 1 and the structure using a shift fork shaft as shown in FIG. 8 as a shaft for rotatably supporting a lock lever, A lever supporting shaft may be formed separately from the existing shaft and supported by the lever supporting shaft.

(2) As a neutral position detecting section,
In the embodiment of FIGS. 1 and 8, the cutout is formed on the surface of the change drum, but a cam-shaped convex portion is formed instead of the cutout, and one end of the lock lever rides on the convex portion. Thus, the lock lever can be rotated to lock the axial position of the clutch body to the clutch disengagement position.

(3) In any of the above-mentioned embodiments, the lock lever is rotatably supported by the shaft. For example, the lock lever is movably supported in the axial direction, and the cam groove is formed in the change drum. It is also possible to have a structure in which one end of the lock lever is engaged with and the lock lever is moved in the axial direction by the rotation of the change drum to lock the clutch body at the clutch disengagement position in the axial direction.

(4) The present invention can be applied to a motorcycle having a multi-plate friction clutch instead of the centrifugal clutch between the speed-change input shaft and the crankshaft.

[0043]

As described above, according to the present invention, (1) since the crankshaft is driven by the kick operation only in the neutral case, the centrifugal clutch for rear wheel drive transmission is provided. Immediately after starting, you can see the engine condition by idling the accelerator without taking care not to connect the centrifugal clutch.

(2) Since the shift position is detected by utilizing the change drum in the shift gear chamber, the neutral position and other shift positions can be detected easily and quickly.

(3) Since the lock lever is arranged in the speed change gear chamber and the rotational position of the change drum is detected by the lock lever, the clutch body of the starting clutch is locked. The new parts to be added to the room are the lock lever and the shaft that supports this, even if it is overestimated, the number of parts is small, cost can be saved, and the appearance around the crankcase does not become complicated and must be large. Nor.

(4) At shift positions other than neutral,
Since the clutch body is locked in the clutch disengaged position, even if the kick operation is performed at a gear shift position other than neutral, the starter clutch is disengaged, so the rider's foot does not receive a large resistance and the kick lever It is possible to perform the stepping-down operation, and it is also possible to recognize that the shift position is other than the neutral position. That is, the comfortable starting operation is not impaired.

(5) The lock lever is rotatably supported on the shaft in the transmission gear chamber, and one end of the lock lever is engaged with the change drum.
If the other end is connected to the clutch body so that it can be engaged and disengaged, and the change drum is provided with a convex portion or a concave portion that abuts against one end portion of the lock lever when in the neutral position, a quick change can be made with a simple structure. The clutch body can be locked by detecting the movement of the drum.

(6) If the lock lever is rotatably supported by the existing shift shaft or shift fork shaft, the number of new members for the lock mechanism can be further reduced.

[Brief description of drawings]

1 is a longitudinal side view (cross-sectional view taken along line II in FIG. 3) showing a shift gear chamber of a motorcycle to which the invention of the present application is applied, in a neutral position.

FIG. 2 is a vertical cross-sectional side view of the same portion as FIG. 1 showing a shift position state other than neutral.

FIG. 3 is a sectional view taken along line III-III in FIG.

FIG. 4 III-II of FIG. 1 showing only around the kick lever axis
FIG.

5 is a development view of the VV cross section of FIG. 1 showing a change of the clutch body at the time of kick starting in the neutral position.

FIG. 6 is a view corresponding to the development of the VV cross section of FIG. 1, showing a change of the clutch body at the time of a kick operation at a shift position other than neutral.

FIG. 7 is a development view of the surface of a change drum.

FIG. 8 is a vertical cross-sectional side view of a transmission gear chamber showing another embodiment.

[Explanation of symbols]

1 crankcase 2 speed change gear chamber 3 variable speed input shaft 4 variable speed output shaft 5 Kick lever shaft 7 Change drum 8,9 shift fork shaft 11, 12, 13, 14 speed change gear 38 Kick lever 40 Return spring 43 Starting gear 45 clutch body 47 clutch spring 48 stopper 49 Start Guide 52,72 Lock lever 53 Notches 55 Peripheral annular groove for lock 56 Return spring

Claims (4)

[Claims] 1. A kick-type starting device for a motorcycle, comprising a starting clutch for connecting and disconnecting a kick lever shaft and a starting gear by movement of a clutch body, wherein the kick-type starting device is engaged with a change drum and is operable by rotation of the change drum. The lock lever is arranged in the speed change gear chamber, and when the change drum is in a shift position other than neutral, the lock lever locks the clutch body in the clutch disengagement position, and when in the neutral position, the lock lever unlocks the clutch body. A kick-type starting device for a motorcycle, which is characterized in that 2. The kick-type starting device for a motorcycle according to claim 1, wherein the lock lever is rotatably supported by a shaft in the speed change gear chamber, one end of the lock lever abuts a surface of the change drum, and the other end of the lock lever is in contact with the surface of the change drum. The clutch body can be engaged and disengaged, and the change drum is formed with a convex portion or a concave portion that engages with one end portion of the lock lever when in the neutral position. apparatus. 3. The kick-type starting device for a motorcycle according to claim 2, wherein the lock lever is rotatably supported by the speed change shaft. 4. The kick starter for a motorcycle according to claim 2, wherein the lock lever is rotatably supported by the shift fork shaft.