JPH0431663A - Kick starter device of engine - Google Patents

Abstract

PURPOSE:To smoothly release a kicking back phenomenon so as to prevent a shock to a foot and a damage to the gear train securely by fitting a kick starter drive gear on a kick shaft slidable with a sliding bearing. CONSTITUTION:In this kick starter to start an engine 2, which is provided on one side of a crankcase 10, a kick starter 16 and a kick starter drive gear 17 are provided on a kick shaft 15, and dogs 18 and 19 are provided on the opposite surfaces of them, making the gearing surfaces 18a and 19a of them in an inclined surface. And when a catching phenomenon is generated, the system is composed to operate a thrust force and to release the gearing. The kick starter 16 is spline-fitted to the kick shaft 15, and the kick starter drive gear 17 is fitted slidable on the kick shaft 15 through a sliding bearing 20. This kick starter drive gear 17 is movable in a necessary scope partitioned by projections 21 and 22.

Description

[Detailed description of the invention] [Purpose of the invention] (Industrial application field) The present invention relates to an engine kick starter device.

(Prior Art) A kick starter device is one of the methods for starting a motorcycle engine. This kick starter device rotates the engine by stepping on a kick lever with the foot to engage the dog of the kick starter and the kick starter drive gear.

The dogs of conventional kick starter devices are arranged in a ring shape with ratchet teeth, and the meshing surfaces of the dogs transmit the kick operation force to the kick starter drive gear. This causes the engine to momentarily rotate in reverse (this phenomenon is called the Ketchen phenomenon), and when the kick lever receives a reaction, it is extremely dangerous if the dog does not disengage, and a shocking stress is applied to the gear train. These may be damaged.

For this reason, the dog's meshing surface is made into an inclined surface, and the kick starter drive gear is spline-fitted to the kick shaft so that the dog can slide out of the dog's mesh due to the thrust force when the ketchen phenomenon occurs. (Utility Model Application Publication No. 57-126569) has been proposed.

(Problem to be Solved by the Invention) However, in the conventional structure described above, the dog's meshing surface is an inclined surface, and even if the meshing becomes disengaged during the Ketchen phenomenon, the kick starter drive gear slides on the spline of the kick shaft and escapes. As a result, splines do not slide smoothly when an impact force is applied because they have a large friction surface and have a complicated manufacturing structure, making it difficult to achieve precision and having subtle backlashes. Therefore, it was impossible to reliably avoid the impact force.

In view of the above-mentioned points, the present invention has been developed to provide an engine that can reliably prevent the dog from disengaging and applying impact to the legs and damage to the gear train when the Ketchen phenomenon occurs in any case. The purpose of the present invention is to provide a kickstarter device.

[Structure of the invention]

(Means for Solving the Problems) As a means for achieving the above object, in the present invention, the movable range is defined between the protrusions provided on the kick shaft, and the starter drive gear is slidably fitted through the sliding receiving shaft. At the same time, a washer that contacts one of the protrusions is slidably fitted onto the kick shaft, and a spring is interposed between the washer and the spring receiver of the kick shaft to connect the washer to the kick drive gear. The reason is that they are made to touch each other.

(Operation) The kick starter engages the dog of the kick starter drive gear, and the rotation of the kick starter drive gear rotates the engine. When the ketchen phenomenon occurs, the starter drive gear slides against the spring because it is free to slide via a sliding bearing, and this causes the dog to immediately disengage, mitigating the impact on the foot and reducing the gear train. damage is prevented.

When the locking phenomenon is resolved, the kick starter drive gear is returned to its original position by the action of the spring, and the kick starter drive gear is returned to a state in which it can engage again by kicking.

(Embodiment) Hereinafter, an embodiment of an engine kick starter device according to the present invention will be described with reference to the accompanying drawings.

FIG. 2 shows an engine 2 equipped with the kick starter device 1 of the present invention. This engine 2 is provided with a primary drive gear 4 on a crankshaft 3, and this primary drive gear 4 is rotatably mounted on a countershaft 5. It meshes with the primary driven gear 6 provided in the. The primary driven gear 6 is connected to the countershaft 5 via a clutch mechanism 7, and a multi-stage transmission mechanism 9 is provided between the countershaft 5 and the drive shaft 8. The drive shaft 8 can be divided into two parts and is pivotally supported by a transmission section of a rank case 10, and an engine sprocket 11 is fixed to the other side. This engine sprocket 11 is configured to transmit engine power to the rear wheels via a power transmission mechanism 12 such as a drive chain.

Further, a kick starter device 1 for starting the engine 2 is provided on one side of the crankcase 10. The kick starter device 1, as shown in FIGS. 1 and 3,
A kick starter 16 and a kick starter drive gear 17 are provided on the kick shaft 15, and a dog 18, 19 as shown in FIGS. 6 and 8 is provided on the opposing surface thereof.
As shown in FIGS. 7 and 9, these dogs 18 and 19 are formed so that their meshing surfaces 18a and 19a are inclined surfaces, and the meshing is disengaged when a thrust force is applied during the Ketchen phenomenon. has been done.

The kick starter 16 is spline fitted to the kick shaft 15, and the kick starter drive gear 17 is fitted onto the kick shaft 15 to freely slide via a sliding bearing 20 such as a sliding bush. The kick shaft 15 is provided with protrusions 21 and 22, such as by fitting a circlip, to allow the kick starter drive gear 17 to move within a required range in the axial direction. When the thickness of the kick starter drive gear 17 is, for example, 7 mm, this amount of movement is approximately 1.5 mm, and is a value that does not affect the meshing with the kick driven gear 24.

A washer 27 is slidably fitted between one protrusion 21 of the kick shaft 15 and a spring receiver 26 provided on the kick shaft 15, and a spring 28 is fitted between the washer 27 and the spring receiver 26. They are fitted so that the washer 27 is brought into contact with the protrusion 17a on the side surface of the kick starter drive gear 17.

The rear side of the kick starter 16 is pressed by a spring 30 which is weaker than the spring 28, and when the kick starter 16 is operated, the kick starter 16 moves toward the kick starter drive gear 17 so that the dogs 18 and 19 mesh with each other. ing. In FIG. 1, 31 is a kick starter lever, and 32 is a kick starter shaft spring that biases the kick shaft 15 in the rotational direction.

Next, the effect will be explained.

When the kick shaft 15 is rotated by the kick operation,
The dog 18 of the kick starter 16 jumps into the dog 19 of the kick starter drive gear 17, and the rotation is transmitted to the kick starter drive gear 17, thereby driving the kick starter driven gear (kick starter idle gear) 24 which is rotatably supported by the drive shaft 8. rotate primary driven gear 6 and primary drive gear 4
After that, the engine 2 can be rotated and started.

When the kick starter phenomenon occurs, kickstarter drive gear 1
7 is free to slide in the axial direction with respect to the kick shaft 15 via the sliding bearing 20, so it slides against the spring 28, and when the kick starter 16 returns, the dogs 18 and 19 are immediately disengaged.

This prevents impact to the foot and damage to the gear system even if the kechen phenomenon occurs. When the locking phenomenon is resolved, the kick starter drive gear 17 is returned by the action of the spring 28 and returned to the position where it can engage again by the kick operation, and the force of the spring 28 causes the kick starter 16 to engage with the dog 18 during the kick operation. maintain a state in which they can engage with each other.

〔Effect of the invention〕

As described above, according to the present invention, the kick starter drive gear is fitted onto the kick shaft by a sliding bearing so that the kick starter drive gear can be smoothly released when the kick phenomenon occurs, thereby preventing impact to the foot or damage to the gear system. can be reliably prevented.

In addition, since kicking force and excessive kicking force are prevented, the strength of related parts can be reduced, and the device can be manufactured in a small size and at low cost.

FIG. 1 is a partial cross-sectional view showing an engine equipped with a kick starter device according to the present invention, FIG. 2 is a cross-sectional view showing an embodiment of the kick starter device for an engine according to the present invention, and FIG. 3 is a kick starter device. Fig. 4 is a state diagram during normal kicking, Fig. 5 is a state diagram during kicking, Fig. 6 is a front view showing the dog of the kick starter, and Fig. 7 is the state diagram shown in Fig. 6. FIG. 8 is an enlarged sectional view taken along line A, FIG. 8 is a front view showing a dog of the starter drive gear, and FIG. 9 is a sectional view taken along line BB in FIG. 8.

1... Kick starter device, 2... Engine, 3...
... Crankshaft, 4... Primary drive gear, 6... Primary driven gear, 15... Kick shaft, 16... Kick starter, 17... Kick starter drive gear, 18.19... Dog ,
20...Sliding bearing, 21.22...Protrusion, 24...
・Kick starter driven gear, 27... washer,
28°30.32...Spring.

[Brief explanation of drawings]

No. figure No. figure

Claims (1)

[Claims] In a kick starter device in which the engaging surface of the dog that connects the kick starter and kick starter drive gear is an inclined surface, the movable range is defined between protrusions provided on the kick shaft, and the kick starter drive gear slides through a sliding bearing. At the same time, a washer that contacts one of the protrusions is slidably fitted onto the kick shaft, and a spring is interposed between the washer and the spring receiver of the kick shaft to connect the washer to the kick starter. A kick starter device for an engine, characterized in that the kick starter drive gear is brought into contact with a drive gear, and a dog between the kick starter drive gear and the kick starter is meshed by a kick operation.