JP2846899B2 - Engine kick starter - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a kick-type starting device incorporated in, for example, an engine for a motorcycle.

2. Description of the Related Art Conventionally, for example, Japanese Patent Laid-Open Publication No. Sho 60-26166 discloses a kick-type starting device incorporated in an engine for a motorcycle.

This starting device is provided with a sector-shaped kick gear that rotates integrally with the kick shaft, and a small gear that constantly meshes with the kick gear and that is linked to the crank shaft. Are urged to rotate in the opposite direction. In this type of starting device, a stopper that holds the kick gear at a predetermined standby position is provided at a portion where the kick gear and the small gear mesh with each other.

That is, in the above publication, in a state where the kick gear is returned to the standby position, the tip of the portion of the kick gear that meshes with the small gear is projected radially outward to form high teeth, This kick gear itself has a stopper function by caulking bacteria adjacent to the high teeth, forming a ridge partly on the surface of the bacteria, and forming a part of the kick gear so as not to mesh with the small gear. I have it.

[Problems to be Solved by the Invention] However, when a part of the teeth of the kick gear is made to have high teeth, when the kick gear is returned to the standby position, the tip of the high tooth becomes near the root of the small gear. Will come into contact with Therefore, during operation of the engine, the contact portion between the tooth tip and the vicinity of the tooth bottom is constantly rubbed due to the vibration of the engine, and even when the kick gear returns to the standby position after the kick is started, an impact is applied to the contact component. As a result, the contact component of the gear is liable to be worn.

In addition, since the tip of the high bacteria portion is sharper than other bacteria, there is also a problem that the tip and the vicinity of the bottom of the small gear are more easily worn.

Further, when a ridge is formed on the tooth surface, the width of the ridge is smaller than the tooth width, so that a sufficient contact area with the small gear cannot be obtained, and the surface pressure applied to the ridge is reduced. And the ridges and small gears are apt to be worn.

Therefore, in either case where a part of the kick gear is formed with high teeth or a part of the teeth is caulked to form a ridge, there is a problem in terms of the durability of the teeth, and the wear of the teeth increases. Then, since the kick gear is always receiving the urging force of the return spring, the teeth of the kick gear get over the teeth of the small gear, causing a problem that the stopper function is impaired.

The present invention has been made based on such circumstances, and can reliably prevent wear of the kick gear and the small gear,
It is an object of the present invention to provide a kick type starting device for an engine in which the durability of these two gears is improved, the stopper member can be replaced as required, and the stopper function can be maintained satisfactorily for a long period of time.

Means for Solving the Problems In order to achieve the above object, a kick starter for an engine according to the present invention includes: a kick gear that rotates integrally with a kick shaft; A return gear that urges the kick gear to rotate in a direction opposite to the rotation direction by the kick operation to return the kick gear to a standby position; and a small gear of the kick gear. It is installed in the part that meshes,
A stopper member which comes into contact with the tooth surface of the small gear when the kick gear is returned to the standby position.

The stopper member is formed of a wire having a circular cross section. The wire extends along the face width direction of the kick gear, and the end of the wire is engaged with a side surface of the kick gear. Characterized by being held by this kick gear.

[Operation] According to this configuration, when the kick gear is returned to the standby position, the stopper member comes into contact with the tooth surface of the small gear, so that the kick gear and the small gear do not mesh with each other, and the kick gear of any further kick gear is disengaged. Rotation is prevented.

At this time, since the stop member extends in the tooth width direction of the kick gear, the stopper member comes into contact with the tooth surface of the small gear in a wide range along the tooth width direction.
For this reason, the contact area between the stopper member and the small gear increases, and the pressure applied to the tooth surface of the small gear can be kept low. At the same time, since the stopper member is formed of a wire having a circular cross section, there is no edge-shaped portion at the contact portion of the stopper member with the small gear, and the stopper member contacts the tooth surface of the small gear. In this case, the stopper member does not cut into or damage the tooth surface. Therefore, wear and breakage of the tooth surface of the small gear can be prevented beforehand,
The durability of the small gear is improved.

Also, some of the teeth of the kick gear will not be sharp,
The tip of this kick gear does not break or deform,
The durability of the kick gear is improved. Therefore, the kick gear can be reliably held at the standby position for a long period of time, in addition to the improvement of the durability of the small gear.

In addition, according to the above configuration, since the stopper member is held by the kick gear by locking the end of the wire to the kick gear, when the stopper member is damaged by long-term use, The stopper member may be removed from the kick gear and replaced. For this reason, it is not necessary to perform special processing on the kick gear or replace the kick gear itself, so that the maintenance work of the kick type starting device can be easily performed.

Embodiment A first embodiment of the present invention will be described below with reference to FIGS. 1 to 4 which are applied to a scooter type motorcycle.

The frame denoted by reference numeral 1 in FIG. 4 has a steering head pipe 2 at its front end. One down tube 3 extending downward is provided on the steering head pipe 2
A pair of left and right main pipes 4 is connected to the lower end of the down tube 3. The main pipes 4 are extended upward and then extended rearward, and an engine bracket 6 is attached to a front end of the extension 5.

A front wheel 8 is supported on the steering head pipe 2 via a front fork 7, and a fuel tank 9 and a storage box for storing, for example, a helmet are provided on the upper surface of the extension 5 of the main pipe 4. Ten
Is arranged.

By the way, an engine unit 15 is arranged below the extension 5 of the main pipe 4. As shown in FIG. 3, the engine unit 15 includes a forced air-cooled engine 16 and a transmission case 18 extending rearward from the left side of a crankcase 17 of the engine 16. The upper surface is pivotally supported by the engine bracket 6 via a link plate 19.

The crankcase 17 is separated into a left case 17a and a right case 17b, and a crankshaft 20 is housed inside the crankcase 17. Left case of crankcase 17
17a and the left side surface of the transmission case 18 connected thereto are covered with a case cover 21. Both cases 17a,
A transmission chamber 22 is formed between the case 18 and the case cover 21, and one end of the crankshaft 20 is introduced into a front end of the transmission chamber 22. The crankshaft 20 is located at the rear end of the transmission chamber 22.
The driven shaft 23 is supported in parallel with the transmission chamber 22.
A V-belt automatic transmission 24 for interlocking the driven shaft 23 and the crankshaft 20 is accommodated therein.

The V-belt automatic transmission 24 has the same configuration as a conventionally known one, and includes a primary sheave 25 that rotates integrally with the crankshaft 20, a secondary sheave 26 that is rotatably mounted on the outer periphery of the driven shaft 23, V-shaped groove 25 of sheave 25, 26
and a V-belt 27 wound around a and 26a. When the rotation speed of the crankshaft 20 increases, the primary sheave 25
The fly weight 28 moves radially outward under centrifugal force to reduce the width of the V-shaped groove 25a.

For this reason, the V-belt 27 is pulled radially inward on the secondary sheave 26 side, and the groove width of the V-shaped groove 26a is widened.
The winding diameter of 7 automatically changes.

The secondary sheave 27 is connected to the driven shaft 23 via a centrifugal clutch 30. The centrifugal clutch 30 includes a centrifugal plate 31 that rotates integrally with the secondary sheave 27.When the rotation speed of the centrifugal plate 31 reaches a predetermined value, the centrifugal weight 32 receives centrifugal force, and the driven shaft 23 It comes into contact with the clutch housing 33 which rotates integrally, and transmits the rotation of the secondary sheave 26 to the driven shaft 23.

The driven shaft 23 is connected to a rear wheel via a gear reducer (not shown).
It is linked to 34 axles 35.

On the other hand, a kick-type starting device 40 is integrally incorporated in the transmission chamber 22. This starting device 40 is a crankshaft
A kick shaft 41 that is parallel to 20 is provided. The kick shaft 41 is located between the crankshaft 20 and the driven shaft 23, and is rotatably supported across the transmission case 18 and the case cover 21. One end of the kick shaft 41 extends outward through the case cover 21, and a kick arm 43 having a kick pedal 42 is connected to the extended end.

A fan-shaped kick gear 44 is fixed on the kick shaft 41 by welding or the like, and a helical gear is used as the kick gear 44.

A crankshaft is provided on the inner surface of the front end of the case cover 21.
A support shaft 45 coaxial with the projection 20 is provided. Support shaft 45
Is parallel to the kick shaft 41, and on the outer periphery of the support shaft 45, a small gear for speed increase which is always meshed with the kick gear 44.
46 are provided. The small gear 46 is provided so as to be slidable in the axial direction with respect to the support shaft 45 and rotatable about the axis. A helical gear is also used as the small gear 46.

Accordingly, when the kick pedal 42 is depressed, the kick gear 44 is rotated clockwise through the kick shaft 41 as shown by the arrow in FIG. 1, and the gear 46 meshing with the kick gear 44 is increased at a constant speed. It is designed to rotate at a ratio.

A starting dog gear 47 is connected to an end face of the small gear 46 on the crankshaft 20 side. Dog gear 47 is crankshaft 20
A dog 49 fixed to the end of the dog gear 48 is detachably opposed to the dog gear 48, and a spring 49 is stretched between the dog gear 47 and the case cover 21. When the small gear 46 is rotated, the spring 49 applies resistance to the rotation of the small gear 46 and converts this rotational force into an axial force of the support shaft 45. Due to the presence, the small gear 46 moves in the axial direction of the support shaft 45, and the starting dog gear 47 jumps into or out of another dog gear 48.

On the outer periphery of the kick shaft 41, a return spring 50 of the kick gear 44 is mounted. The return spring 50 urges the kick gear 44 to rotate in a direction opposite to the direction of rotation at the time of the kick operation, that is, in a counterclockwise direction in FIG. Its teeth as shown in the figure
51 is returned to the standby position facing downward. A part of the teeth 51 of the kick gear 44, which is located at the end on the rear side in the returning direction, has a stopper that prevents engagement with the small gear 46 and stops the kick gear 44 at the standby position. A member 52 is provided.

The stopper member 52 is formed of a wire having a circular cross section, and the wire is bent in a substantially U shape. And, as shown in FIG. 2, the stopper member 52
51 is located at the tooth bottom 54, one end 52a of which is inserted into a through hole 55 opened in the side surface of the kick gear 44,
The other end 52 b is bent along the side surface of the kick gear 44.

Therefore, the stopper member 52 is connected to the tooth bottom 54 of the kick gear 44.
When the kick gear 44 is returned to the standby position by the return spring 50, the stopper member 52 is provided on the tooth surface 56a of the tooth 56 of the small gear 46 when the kick gear 44 is returned to the standby position by the return spring 50. The teeth 56 are pressed and cooperated with the tooth surface 51a of the kick gear 44 to be sandwiched therebetween.

In the case of the present embodiment, as shown by the imaginary line in FIG. 1, when the kick gear 44 rotates beyond the allowable limit, the inner surface of the case cover 21 A pair of stopper walls 58 protruding from the end surface are provided.

In such a configuration, when the kick pedal 42 is depressed, the kick gear 44 rotates by a predetermined angle, so that the small gear 46 meshing with the kick gear 44 is rotated at an increased speed. For this reason, the starting dog gear 47 integrated with the small gear 46 jumps into and meshes with the other dog gear 48 opposed thereto, so that the crankshaft
20 is forcibly driven to rotate, and the engine 16 is started.

By the way, when the engine 16 starts, the kick pedal
When the pressing of 42 is released, the kick gear 44 is rotated counterclockwise under the urging force of the return spring 50, and is returned to the standby position shown in FIG. When the kick gear 44 reaches the standby position, the stopper member
Since 52 presses against the tooth surface 56a of the small gear 46, the kick gear 44
Does not mesh with the small gear 56, and further rotation of the kick gear 44 is prevented.

In this case, since the stopper member 52 extends along the face width direction of the kick gear 44, the stopper member 52
Comes into pressure contact with the gear 56a of the small gear 46 in a wide range over the entire width thereof. For this reason, the contact area between the stopper member 52 and the tooth surface 56a of the small gear 46 increases, and accordingly, the surface pressure applied to the gear 56a of the small gear 46 is suppressed low, and the tooth surface 56a is hardly worn. .

At the same time, since the stopper member 52 is made of a wire having a circular cross section, the small gear 46 of the stopper member 52 is
When the stopper member 52 comes into contact with the tooth surface 56a of the small gear 46, the stopper member 52 bites into the tooth surface 56a or damages the tooth surface 56a when there is no edge-shaped portion in contact with the Nor. Therefore, wear and breakage of the teeth 56 of the small gear 46 can be prevented, and the durability of the small gear 46 is improved.

In addition, since it is not necessary to form the kick gear 44 with high teeth, the tip of the kick gear 44 is not deformed, and the tooth surface 56a is hardly worn. The durability of 46 is improved, and the stopper function for holding the kick gear 44 at the standby position can be favorably maintained for a long period of time.

Further, since the stopper member 52 is held by the kick gear 44 by locking one end 52a of the wire into the through hole 55 on the side surface of the kick gear 44, the stopper member 52 can be used for a long time. When the stopper member 52 is deformed or damaged, the stopper member 52 may be removed from the kick gear 44 and replaced. For this reason, it is not necessary to perform special processing on the kick gear 44 or replace the entire kick gear 44, and the maintenance work of the kick-type starting device 40 can be easily performed.

The present invention is not limited to the first embodiment described above, and FIGS. 5 and 6 show a second embodiment of the present invention.

In the second embodiment, a stopper member 52 made of a wire is
The intermediate portion of the tooth surface 51a of the kick gear 44, that is, the tooth bottom 54 and the tooth tip 6
It is provided between 1.

According to this configuration, since the stopper member 52 is located at a position higher than the tooth bottom 54 of the kick gear 44, when the kick gear 44 is returned to the standby position, the stopper member 52 is moved as shown in FIG. Thus, the tooth surface 56a of the small gear 46 is reliably contacted.

For this reason, the stopper member 52 does not hit the corner of the tooth tip of the small gear 46, and there is an advantage that the durability of the small gear 46 and the stopper member 52 is further improved.

In the kick-type starting device of the present invention, the shape of the kick gear is not limited to a sector shape, and may be, for example, a semicircle or a circle.

[Effects of the Invention] According to the present invention described in detail above, the contact portion between the pinion and the stopper member extends in the face width direction, so that the pressure applied to the tooth surface of the pinion can be reduced. In addition, since the stopper member is formed of a wire having a circular cross section, there is no edge-shaped portion at the contact portion of the stopper member with the small gear, and the stopper member is formed on the tooth surface of the small gear. It does not bite or damage this tooth surface. Therefore, wear and breakage of the tooth surface of the small gear can be prevented. Also, since there is no need to form the kick gear with high teeth, the teeth of the kick gear do not deform,
The durability of kick gears and small gears is remarkably improved as compared with the prior art. Therefore, the stopper function for holding the kick gear at the standby position can be favorably maintained for a long time.

Moreover, the stopper member is held by the kick gear by locking its end to the kick gear. Therefore, if the stopper member is deformed or damaged due to long-term use, the stopper member is Can be removed from the kick gear and replaced. For this reason, it is not necessary to perform special processing on the kick gear or replace the kick gear itself, and there is an advantage that the maintenance work of the kick type starting device can be easily performed.

[Brief description of the drawings]

1 to 4 show a first embodiment of the present invention.
FIG. 2 is a side view of the starting device, FIG. 2 is a side view showing an enlarged part II in FIG. 1, FIG. 3 is a plan view showing a partly sectioned engine unit, and FIG. 4 is a side view of a scooter type motorcycle. 5, 5 and 6 show a second embodiment of the present invention. FIG. 5 is a perspective view of a kick gear, and FIG. 6 is an enlarged side view of a meshing portion of the gear. 16… Engine, 20… Crank shaft, 41… Kick shaft,
44: Kick gear, 46: Small gear, 50: Return spring, 52: Stopper member.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F02N 3/04 F02N 15/02

Claims (1)

(57) [Claims] A kick gear rotating integrally with a kick shaft; a small gear constantly meshing with the kick gear and interlocking with a crankshaft of an engine; and a direction opposite to a rotation direction of the kick gear by a kick operation. A return spring for urging the kick gear to return to the standby position; and a return spring installed at a portion where the kick gear meshes with the small gear, and the tooth surface of the small gear when the kick gear is returned to the standby position. The stopper member is made of a wire having a circular cross section, and the wire extends along the tooth width direction of the kick gear, and the end of the wire is connected to the end of the kick gear. A kick-type starting device for an engine, wherein the kick-type starting device is held by the kick gear by being locked to a side surface of the kick gear.