JPH09228936A - Unit swing engine starting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify the manufacture of a starter driven gear by forming the starter driven gear into an annular flat plate body and attaching the starter driven gear on an annular outer wall of a movable drive. SOLUTION: A starter driven gear 52 formed into an annular flat plate body is fixed on a wall positioned on a central side of an engine 2 among annular outer walls w of a movable face 2616 . Moreover, the starter driven gear 52 is attached coaxially for a crank shaft 12. Power of a starter motor 58 is transmitted to the starter driven gear 52 through a starter pinion 56. When the starter driven gear 52 rotates, the movable face 2616 also rotates. As a result, the crank shaft 12 rotates through the movable face 2616 to start an engine. Consequently, the manufacture of the starter driven gear is simple, and it is possible to reduce the weight of a starting device and width dimension of the engine.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a unit swing engine starting device. More specifically, the present invention relates to a unit swing engine starting device that is used in scooters, family bikes, and the like and that uses a starter motor.

[0002]

2. Description of the Related Art FIG. 3 shows an example of a conventional unit swing engine a, which is disclosed in, for example, Japanese Utility Model Laid-Open No. 57-99961. As can be seen from this figure, the starter driven gear d for transmitting the starting force to the crankshaft c by the starter motor b is located at the lower outer end of the crankshaft c in FIG. 3 (to the left of the vehicle). Therefore, the starter motor b is also located outside the engine a, and as a result, the center of gravity of the entire engine is biased to the outside.

Therefore, it is conceivable to arrange the starter driven gear near the center of the crankshaft and the starter motor near the center of the engine. FIG.
It is an example of a unit swing engine having such an arrangement structure and is an enlarged view showing a starting device e which is a main part of the unit swing engine. The right side in Fig. 4 means the vehicle center side. This starting device e
Includes a starter motor f and a starter driven gear h coaxially attached to the crankshaft g.

In the meantime, when the arrangement structure as described above is adopted, the starter driven gear h is normally formed in such a manner that the starter driven gear h has a shape in which the bearing portion of the crankshaft g and the convex portion of the oil seal portion mounting box are escaped. The shape is such that the central portion h ₁ that is a portion externally fitted to the crankshaft g has a shape projecting to the opposite central side in the axial direction of the crankshaft g, and the peripheral edge h ₂ of the central portion h ₁ has a flange shape. It was necessary to project it outside. In other words, it was necessary to form a plate with a rim, so-called a plate with a rim. That is, since the shape of the starter driven gear h is not a simple planar shape, it is not only difficult to manufacture, but also the weight increases, which may result in an increase in the weight of the entire starting device e, and the center of the starter driven gear h. The width dimension of the engine is increased by the amount that the portion h ₁ projects in the axial direction of the crankshaft g.

For this reason, it has been desired to provide a technique in which the starter driven gear can be easily manufactured, the weight of the starting device can be reduced, and the width of the engine can be reduced.

[0006]

SUMMARY OF THE INVENTION The present invention has been invented in view of the above situation, and the problem to be solved is to arrange a starter driven gear near the center of a crankshaft and to start an engine with a starter motor. In the unit swing engine starter that is located closer to the center of, the starter driven gear is easy to manufacture,
Moreover, it is an object of the present invention to provide a starting device for a unit swing engine which can reduce the weight of the starting device and can reduce the width dimension of the engine.

[0007]

The present inventor has taken the following means in order to solve the above problems. That is, in the unit swing engine starting device of the present invention, the power of the starter motor is set in the state where the starter driven gear coaxial with the crankshaft is arranged near the center of the crankshaft and the starter motor is arranged near the center of the engine. In a starter for a unit swing engine, which transmits to a starter driven gear and thereby rotates the crankshaft, the starter driven gear is an annular flat plate body, and the starter driven gear is spline-coupled to the crankshaft, It was attached to the annular outer wall of a movable drive, which is one of the constituent members of the V-belt type continuously variable transmission.

Therefore, according to the present invention, since the starter driven gear is a simple annular flat plate body, its manufacture is simple. In addition, since it has an annular shape and has no central portion, it is lighter. Therefore, the weight of the starting device can be reduced.

Further, since the starter driven gear is attached to the annular outer wall of the movable drive, the starter driven gear and the movable drive are integrated. In other words, it is the same as the gear teeth being previously provided on the annular outer wall of the movable drive. Therefore, when the power of the starter motor is transmitted to the starter driven gear, the moveable drive directly rotates. The moveable drive is splined with the crankshaft, so that when the moveable drive rotates, the crankshaft rotates with it, thereby starting the engine. Therefore, it can be considered that it is substantially the same as the conventional starter driven gear.

Moreover, since the starter driven gear is an annular flat plate that is mounted coaxially with the crankshaft, the conventional starter driven gear has a central portion protruding toward the end opposite to the center in the axial direction of the crankshaft. Therefore, it can be said that the central part is deleted. For this reason, the space on the crankshaft is not required, and the width of the engine can be reduced accordingly.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will now be described in detail based on the illustrated embodiments with reference to the drawings. FIG. 1 is a plan sectional view of a unit swing engine 2 (hereinafter referred to as “engine 2”) adopting a unit swing engine starting device 1 according to the present invention, and FIG. 2 is an enlarged sectional view of a main part of FIG. The unit swing engine starting device 1
Is used in scooters and sleaters.

First, the V-belt type continuously variable transmission 3 will be described. A drive pulley 16 and a driven pulley 18 are attached to the crankshaft 12 as a drive shaft and the drive shaft 14 as a driven shaft, respectively. Then, a movable face 26 ₁₆ as a movable drive that constitutes both pulleys 16 and 18
26 ₁₈ and the fixed face 28 ₁₆ , 28 ₁₈ by connecting the V-belt 20 to the grooves 16 a, 18 a formed between the pulleys 16 and 18, so that the rotational force of the crankshaft 12 is increased. 16 is transmitted to the driven pulley 18, and is further attached to the rear axle shaft 32 via the idle shaft 30, the rear axle shaft 32, and various gears 34, 34, ... Such as idler gears related to these shafts 14, 30, 32. The rear wheel 36 is rotated.

The drive pulley 16 has crankshaft 12 whose basic components are well understood from FIG.
A movable face 26 ₁₆ which is spline-coupled to the crankshaft 12 and which slides in the axial direction of the crankshaft 12 but does not rotate alone with respect to the crankshaft 12, and a movable face 26 ₁₆ which is fixed to the crankshaft 12 and is located outside the vehicle. Next face 28 ₁₆ .

A movable face 26 ₁₆ which is one of the constituent members of the V-belt type continuously variable transmission 3 is fixed to a movable drive plate 42 via a damper 40. Further, a weight roller 44 is arranged between the movable drive plate 42 and the movable face 26 ₁₆ . Movable drive plate 4
2, the weight roller 44 is attached to the movable face 26 ₁₆
It is intended to prevent it from being exposed to the outside from the pocket portion 45 of the crankcase 12 and is fixed to the crankshaft 12.

The fixed face 28 ₁₆ is fitted and inserted into the shaft end portion (the left end portion in FIG. 2) of the crankshaft 12, and a nut 48 screwed to the shaft end portion is used to fix the nut 48 and the end portion of the collar 38. It is fixed by pressure contact with 38a. This causes fixed face 28 ₁₆ and collar 38 to rotate integrally with crankshaft 12. In addition, the anti-removable face side 28 ₁₆ a fix preparative face 28 _16, fins 39 for introducing fresh air into the apparatus is more disposed.

Further, the drive pulley 16 has a mechanism such as a spring or the like for receiving an elastic force so that the effective diameter becomes small, that is, the movable face 26 ₁₆ is separated from the fixed face 28 ₁₆ by itself.

On the other hand, the driven pulley 18 is provided with a movable face 26 ₁₈ on the outside of the vehicle (the lower side in FIG. 1) of the drive shaft 14 as opposed to the drive pulley 16.
And a fixed face 28 ₁₈ is disposed inside the vehicle (upper side in FIG. 1) of the drive shaft 14, and the movable face 26 ₁₈ moves on the drive shaft 14 along the axial direction, whereby the driven pulley 28 ₁₈ is driven. The effective diameter of 18 is changed. However, the driven pulley 18 has a mechanism that receives elasticity by a spring or the like so that its effective diameter becomes large, that is, the movable face 26 ₁₈ naturally approaches the fixed face 28 ₁₈ . It is to be noted that reference numeral 50 in FIG. 1 denotes a split type case body in which the above-mentioned constituent members of the V-belt type continuously variable transmission 3 are housed.

The V-belt type continuously variable transmission 3 is constructed as described above.

When the drive pulley 16 rotates at a high speed, the weight roller 44 receives the centrifugal force at that time and moves outward. Then, the movable face 26 ₁₆ resists the elasticity of the drive pulley 16 and reaches the position balanced with the centrifugal force.
It moves on the collar 38 toward the 8 ₁₆ side and approaches, and accordingly, the effective diameter around which the V belt 20 is wound around the drive pulley 16 increases.

At this time, in the driven pulley 18, the V-belt is pulled by the force at that time as the effective diameter of the drive pulley 16 increases, and the V-belt is applied to the driven pulley 18. It bites against the elasticity and reduces the effective diameter of the driven pulley 18. On the contrary, when the speed becomes low, the centrifugal force becomes small, and the movable face 26 ₁₆ moves on the collar 38 so as to be separated from the fixed face 28 ₁₆ side by the elasticity of the drive pulley 16. Therefore, contrary to the above, the effective diameter of the drive pulley 16 becomes smaller,
The effective diameter of the driven pulley 18 becomes large.

In this way, the reduction ratio changes, and the tension of the V-belt 20 is kept constant.

Next, the starting device 1 will be described. As shown in FIG. 2, of the annular outer wall w of the movable face 26 ₁₆ , the starter driven gear 52 formed in an annular flat plate body is provided on the end surface w ₁ located on the center side (the right side in FIG. 2) of the engine 2. It is fixed by a screw 54. The starter driven gear 52 is mounted coaxially with the crankshaft 12.

The power of the starter motor 58 is transmitted to the starter driven gear 52 via the starter pinion 56. Specifically, the starter driven gear 52 and the pinion gear 56a of the starter pinion 56.
The driven gear 56b of the starter pinion 56 and the starter motor gear 58a of the starter motor 58 mesh with each other, so that the starter motor 5
The power of 8 is transmitted to the starter driven gear 52 and tries to rotate the starter driven gear 52. Further, since the starter driven gear 52 and the movable face 26 ₁₆ are integrated, when the starter driven gear 52 rotates, the movable face 26 ₁₆ also rotates, and as a result, the crankshaft 12 rotates via the movable face 26 ₁₆ to rotate the engine. It is started.

In the starter 1 thus constructed, however, the starter driven gear 52 is a simple annular flat plate body, and therefore its manufacture is simple. Also,
Since it has an annular shape, there is no central part, so it is lighter. Therefore, the weight of the starting device 1 can be reduced.

Further, since the starter driven gear 52 is attached to the annular outer wall of the movable drive 26 ₁₆ , the starter driven gear 52 and the movable drive 26 ₁₆ are integrated. In other words, the gear teeth are provided in advance on the annular outer wall w of the movable drive 26 ₁₆ . Therefore, the starter driven gear 52 is connected to the starter motor 5
When the power of 8 is transmitted, the movable drive 26 ₁₆ directly rotates. Since the movable drive 26 ₁₆ is spline-coupled to the crankshaft 12, when the movable drive 26 ₁₆ rotates, the crankshaft 12 rotates together with this rotation, and as a result, the engine 2 is started. Therefore, it can be considered that it is substantially the same as the conventional starter driven gear.

Further, since the starter driven gear 52 is an annular flat plate member that is mounted coaxially with the crankshaft 12, the conventional starter in which the central portion of the crankshaft 12 protrudes from the end opposite to the center in the axial direction of the crankshaft 12. This is the same as the form in which the central portion is removed from the driven gear. Therefore, the space on the crankshaft 12 is not required, and the width of the engine 2 can be reduced accordingly.

Further, since the starter driven gear 52 is attached to the end surface w ₁ of the annular outer wall w, the starter driven gear 52 also serves to prevent the movable drive plate 42 from coming off the movable face 26 ₁₆ . That is, it also has a function as a stopper.

[0028]

According to the present invention, in a unit swing engine starter in which a starter driven gear is arranged near the center of a crankshaft and a starter motor is located near the center of the engine, the starter driven gear is easy to manufacture, and The weight of the starting device can be reduced and the width of the engine can be reduced.

[Brief description of drawings]

FIG. 1 is a plan sectional view of a unit swing engine in which a unit swing engine starting device according to the present invention is adopted.

FIG. 2 is an enlarged sectional view of a main part of FIG.

FIG. 3 is a diagram for explaining a conventional technique.

FIG. 4 is a diagram for explaining another conventional technique.

[Explanation of symbols]

1 unit swing engine starting device 3 V belt type continuously variable transmission 2 engine 12 crankshaft 26 ₁₆ movable drive w annular outer wall 52 starter driven gear 58 starter motor

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[Procedure amendment]

[Submission date] April 2, 1996

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0013

[Correction method] Change

[Correction contents]

The drive pulley 16 has crankshaft 12 whose basic components are well understood from FIG.
A movable face 26 ₁₆ which is spline-coupled to the crankshaft 12 and which slides in the axial direction of the crankshaft 12 but does not rotate alone with respect to the crankshaft 12, and a movable face 26 ₁₆ which is fixed to the crankshaft 12 and is located outside the vehicle. it is a flow I Tsu Custo face 28 ₁₆ Doo.

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0014

[Correction method] Change

[Correction contents]

A movable face 26 ₁₆ which is one of the constituent members of the V-belt type continuously variable transmission 3 is fixed to a movable drive plate 42 via a damper 40. Further, a weight roller 44 is arranged between the movable drive plate 42 and the movable face 26 ₁₆ . Movable drive plate 4
2, the weight roller 44 is centrifuged by the rotation of the crank.
Shape the inclined surface to move outward or inward with force
It is fixed to the crankshaft 12.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0016

[Correction method] Change

[Correction contents]

The drive side pulley is a driven side.
With the spring inside, it is always through the V-belt
The effective diameter is about to become smaller.

[Procedure amendment 4]

[Document name to be amended] Statement

[Name of item to be corrected] 0024

[Correction method] Change

[Correction contents]

In the starting device 1 thus constructed, the starter driven gear 52 is a simple annular flat plate body, and therefore its manufacture is simple. In addition, since it has an annular shape and has no central portion, it is lighter. Therefore, the weight of the starting device 1 can be reduced.

[Procedure Amendment 5]

[Document name to be amended] Drawing

[Correction target item name] Figure 2

[Correction method] Change

[Correction contents]

[Fig. 2]

Claims (1)

[Claims] 1. A starter-driven gear coaxial to a crankshaft is arranged near the center of the crankshaft and a starter motor is arranged near the center of the engine, and the power of the starter motor is transmitted to the starter-driven gear. In a unit swing engine starting device in which the crankshaft is rotated by means of the V-belt type continuously variable transmission, the starter driven gear is an annular flat plate body, and the starter driven gear is spline-coupled to the crankshaft. A unit swing engine starter characterized by being attached to an annular outer wall of a movable drive, which is one of the constituent members of.