JPH0543267Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a starting device for a small engine equipped with a recoil starter and an electric starter that are started by manually pulling a recoil rope.

[Conventional technology]

Conventionally, a recoil starter has been used to start small engines in order to reduce their size and weight (see, for example, Japanese Utility Model Application No. 53-97233). Starting the recoil starter by pulling the recoil rope requires the operator to pull the recoil rope by hand, so there have been requests from users to make starting even easier. Therefore,
In order to make it easier to start the engine, a starter motor is provided in addition to the recoil starter, and the starting device is normally started by the starter motor, but on the other hand, there is a known starting device that can be started by the recoil starter in an emergency. .

[The problem that the idea attempts to solve]

Incidentally, when the engine is started by pulling the recoil rope, the elasticity of the recoil rope can alleviate the impulsive force when the clutch claws are engaged. On the other hand, when starting with a starter motor, the rotational force cannot be adjusted, so the impact force is directly applied to the starter motor, and a large impact force is also applied to the pawls.

Furthermore, the provision of a starter motor in addition to the recoil starter results in an increase in the size of the starting device.

This invention was devised in view of the above-mentioned conventional disadvantages, and aims to provide a small-sized engine starting device that can reduce the impact force applied to the starter motor and its clutch mechanism, and can be downsized.

[Means to solve the problem]

In order to achieve the above object, this invention first fixes a rubber plate to a pulley fastened to a crankshaft, and fixes a retainer to this rubber plate.
Further, a first clutch mechanism is provided that transmits the rotational force of the reel rotated by the pulling operation of the recoil rope to a driven gear or pulley that receives rotation from the starter motor. The second clutch mechanism that transmits the rotational force from the driven gear to the retainer is provided closer to the outer diameter than the first clutch mechanism.

[Effect]

Generally, the first and second
An impact force proportional to the engine torque at the time of starting is applied to the clutch mechanism, but according to this invention, the second clutch mechanism, which transmits the rotational force of the starter motor from the driven gear to the retainer, is connected to the first clutch mechanism.
Since the second clutch mechanism is provided closer to the outer diameter than the first clutch mechanism, the impact force applied to the engaging portion of the second clutch mechanism is smaller than the impact force applied to the first clutch mechanism. Further, since the first clutch mechanism whose impact force is adjusted by the elasticity of the recoil rope is provided closer to the inner diameter than the second clutch mechanism, it is configured to be smaller, so that the starter device can be made smaller. Also, since the rotational force from the starter motor is transmitted to the pulley via the driven gear, second clutch mechanism, retainer and rubber plate,
Due to the elastic deformation of the rubber plate in the circumferential direction, the impact force on the engaging portion of the second clutch mechanism is alleviated, and the load on the starter motor due to the impact force is alleviated.

〔Example〕

Embodiments of this invention will be described below with reference to the drawings.

1 to 5 show a first embodiment of this invention. In FIG. 1, a pulley 2 is fastened to a crankshaft 1 with a nut 3. As shown in FIG. Reference numeral 4 denotes a recoil rope, which rotates the reel 5 by pulling the recoil rope. The reel 5 is rotatably mounted on a support shaft 6 that projects from the recoil starter cover 7 toward the crankshaft 1.

31 is a first clutch mechanism, and in this embodiment, a pawl 31a is provided on the pulley 2, while an engaging portion 31b is formed on the reel 5. As is well known, this first clutch mechanism 31 is rotatably supported by a spring 31c with a pawl 31a engaged with an engaging portion 31b, and transmits the rotational force from the reel 5 to the pulley 2. It is something.
That is, when the pulley 2 rotates (rotation direction C of the engine in FIG. 2), the pawl 31a rotates at the engaging portion 31b.
When the engine rotates idly and the engine speed increases, it is swung outward as shown by arrow A in FIG. 2 due to centrifugal force and does not come into contact with the engaging portion 31b in FIG. 1.

A starter motor 8 on the lower side is fixed to a starter case 9, and as is well known, is operated from a starting switch (not shown) to rotate a drive gear 10. The rotation of the drive gear 10 is decelerated through the first intermediate gear 11, the first support pin 21, the second intermediate gear 12, the third intermediate gear 13, and the second support pin 22, while The signal is transmitted to the fourth intermediate gear 14.

A driven gear 30 meshes with the fourth intermediate gear 14 and receives rotational force from the starter motor 8. This driven gear 30 is, for example, a pulley 2
via a bearing 33, so as to be freely rotatable. The driven gear 30 has an engaging portion 32b that engages with the pawl 32a of the second clutch mechanism 32.
Continuously formed on the inner peripheral surface.

40 is a rubber plate, 43 is a retainer plate, and 50 is a holding member, which are connected to the driven gear 30 and pulley 2.
is placed between. The pressing member 50 is
For example, the cylindrical portion 50a is in contact with the inner race of the bearing 33, while the collar 50b integrally formed on the right side of the cylindrical portion 50a is in contact with the retainer plate 43. A plate 43 is pressed and fixed to the rubber plate 40, and the rubber plate 40 is pressed and fixed to the pulley 2 via the retainer plate 43.

As shown in FIG. 3, four through holes 40a are formed in the rubber plate 40.
As shown in FIG. 4, a protruding pin 2b integrally formed with the pulley 2 is fitted into the portion a. The above rubber plate 40
As shown in FIG. 3, two notches 40c are provided in which the base of the claw 31a shown in FIG. 1 is accommodated. 40d indicated by a dashed line is a positioning recess;
The protrusion 43b of the retainer plate 43 shown in FIG. 1 is fitted.

The second clutch mechanism 32 shown in FIG.
Claw 32a rotatably provided on retainer plate 43
However, due to a spring (not shown), the engaging portion 32b
The rotational force from the driven gear 30 is transmitted to the retainer plate 43 (FIG. 1). In other words, when the pulley 2 rotates in the direction of arrow C (engine rotation direction), the pawl 32a
hits the engaging portion 32b and rotates idly, while when the engine speed increases, centrifugal force causes the arrow A in Fig. 5 to rotate.
The side 32d opposite to the claw is swung outward, and the claw 32
The structure is such that the engaging portion 32b shown in FIG. 1 does not come into contact with each other.

This second clutch mechanism 32 is provided closer to the outer diameter than the first clutch mechanism 31. That is, the engaging portion 32b of the second clutch mechanism 32 is provided closer to the outer diameter than the engaging portion 31b of the first clutch mechanism 31.

Next, the operation of the above configuration will be explained.

Normally, the starter motor 8 starts the engine. First, as the starter motor 8 rotates, the driven gear 30 rotates via the first to fourth intermediate gears 11...14. This rotational force is transmitted from the engaging portion 32b of the second clutch mechanism 32 to the pawl 32a, and is further transmitted to the retainer plate 4.
3. It is applied to the crankshaft 1 via the rubber plate 40 and the pulley 2. As a result, the engine starts and the centrifugal force of the pawl 32a causes the pawl 32a to
The engagement between the engagement portion 32b and the engagement portion 32b is released. Note that even if the pulley 2 rotates in the engine rotation direction, the first clutch mechanism 31 idles, so the reel 5 does not rotate.

On the other hand, if power cannot be supplied, the engine is started by pulling the recoil rope 4. That is, by pulling the recoil rope 4, the reel 5 is rotated and the crankshaft 1 is rotated through the first clutch mechanism 31 and the pulley 2.
rotates. Note that, due to the rotation of the pulley 2 during the tensioning operation, the fifth clutch mechanism 32 in the second clutch mechanism 32
Since the claw 32a shown in the figure escapes in the direction of arrow B, the intermediate gears 11...14, driven gear 30, etc. on the starter motor 8 side of FIG. 1 do not rotate.

In the above configuration, when starting by the starter motor 8, since the rotational force of the starter motor 8 cannot be adjusted, the pawl 32a of the second clutch mechanism 32
It is necessary to reduce the collision force at the time of engagement with the engaging portion 32b and to reduce the load applied to the starter motor 8. Here, this invention is based on the claw 32.
The retainer plate 43 provided with the rubber plate 40
The rubber plate 40 is fixed to the pulley 2. Therefore, due to elastic deformation of the rubber plate 40 in the circumferential direction, the retainer plate 43 rotates slightly with respect to the pulley 2, so that the claw 32a and the engaging portion 32b
The impact force applied to the starter motor 8 is reduced, and the impact load applied to the starter motor 8 is reduced.

Generally, an impact force proportional to the engine torque at the time of starting is applied to the first and second clutch mechanisms 31 and 32 that transmit the driving force at the time of starting, but the engagement of the second clutch mechanism 32 Part 32b
is provided closer to the outer diameter than the engaging portion 31b of the first clutch mechanism 31, so that the impact force received from the pawl 32a itself becomes smaller. On the other hand, the first part whose impact force is adjusted by the elasticity of the recoil rope 4
The clutch mechanism 31 is the second clutch mechanism 32
Since it is provided closer to the inner diameter than the starting device, it can be made smaller, so the starter device can be made smaller.

Incidentally, in the case of the above embodiment, the first clutch mechanism 31 directly transmitted the rotational force of the reel 5 to the pulley 2, but the first clutch mechanism 31 also transmitted the rotational force of the reel 5 to the driven gear 30, and the transmitted rotational force , second
The clutch mechanism 32 may be applied to the pulley 2 via the clutch mechanism 32. An example of this is shown in the second embodiment shown in FIGS. 6-9.

In FIG. 6, the driven gear 30 is rotatably mounted on the support shaft 6 and has engaging portions 31b and 32b of the first and second clutch mechanisms 31 and 32. Pawl 31 of the first clutch mechanism 31
The claw 32a of the second clutch mechanism 32 is rotatably provided on the retainer plate 43 by a support pin 44 and a spring 32c. Therefore, reel 5
The torque from
granted to.

The rubber plate 40 has a large number of through holes 40a, 40b as shown in FIG. 7, and the three screws 41 shown in FIG. 8 are inserted into the through holes 40a.
It is fixed to the pulley 2 shown in FIG. On the other hand, the three screws 42 shown in FIG. 9 are inserted into the through holes 40b shown in FIG. 7 in this rubber plate 40, and the retainer plate 43
is fixed. In addition, 2a and 4 in Figure 8
Reference numeral 3a denotes a relief hole that allows rotation of the retainer plate 43 in the circumferential direction.

Further, a recoil rope 4 is provided between the fourth intermediate gear 14 and the second support pin 22 in FIG. A one-way clutch 23 is provided to prevent the transmission from occurring. The other configurations are the same as the first embodiment,
Identical or equivalent parts are given the same reference numerals and their explanations will be omitted.

By the way, in the above two embodiments, the rubber plate 40
the presser member 50 in Fig. 1 or the screw 41 in Fig. 6.
Although in this invention the rubber plate 40 is fixed to the pulley 2, the rubber plate 40 may be fixed to the pulley 2 and the retainer plate 43 by gluing or baking.

[Effect of idea]

As explained above, according to this invention, the second clutch mechanism that transmits the rotational force of the starter motor from the driven gear to the retainer is provided closer to the outer diameter than the first clutch mechanism, and the retainer and pulley are connected to each other. I fixed it with a rubber plate between them,
It is possible to reduce the impact force when the second clutch mechanism is engaged and the impact load applied to the starter motor, and it is also possible to downsize the starter device.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a starter device showing the first embodiment of this invention, Fig. 2 is a sectional view of a pulley taken along the - line in Fig. 1, and Fig. 3 is a sectional view of a rubber plate taken along the - line in Fig. 1. Cross-sectional view, Figure 4 is - of Figure 5.
A cross-sectional view of a pulley, rubber plate, etc. at the line,
FIG. 5 is a sectional view of the second clutch mechanism taken along the line - in FIG. 1, FIG. 6 is a sectional view of the starting device showing the second embodiment, and FIG.
FIG. 8 is a plan view of the retainer plate, and FIG. 9 is a sectional view taken along the line -- in FIG. DESCRIPTION OF SYMBOLS 1... Crankshaft, 2... Pulley, 4... Recoil rope, 5... Reel, 8... Starter motor, 30... Driven gear, 31... First clutch mechanism, 32... Second clutch Mechanism, 40...
Rubber plate, 43...retainer (plate).

Claims (1)

[Scope of utility model registration request] A starter motor, a reel that rotates by pulling a recoil rope, a pulley fastened to the crankshaft, and a rubber plate fixed to the pulley.
a retainer fixed to the rubber plate; a driven gear that receives the rotational force from the starter motor; a first clutch mechanism that transmits the rotational force from the reel to the pulley or the driven gear; A starting device for a small engine, comprising: a second clutch mechanism that is provided closer to the outer diameter than the mechanism and transmits the rotational force from the driven gear to the retainer.