JP2007270736A - Detachable starter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a detachable starter capable of reducing manufacturing cost, reducing weight and surely starting an engine. <P>SOLUTION: The starter is characterized by a case 13 having a main shaft 12, a reel 16 which is rotatably secured on the main shaft 12, has a recoil rope 14 wound thereon and a recoil spring 15 built-in for winding up the recoil rope 14, rotates when the recoil rope 14 is drawn out and can be inverted by biasing force of the recoil spring 15 to wind up the recoil rope 14, and a drive unit 11 capable of transmitting rotation of the reel 16 as starting force to a crank shaft of the engine. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a detachable starter, and more particularly to a detachable starter that can be mounted on an engine unit and start an engine when necessary.

  In general, various types of driving work machines such as mowers that perform work outdoors using driving force generated from an engine are equipped with a cell motor for starting the engine. Such a cell motor operates when power is supplied from a battery installed in the main body of the drive type work machine.

In this case, when the equipped battery rises and power cannot be supplied to the cell motor, the cell motor cannot be operated and the engine cannot be started. In such a case, it is convenient to have a detachable starter for starting the engine.

The applicant of the present application investigated past documents from such a viewpoint, and extracted the following documents.
The technology described in the following document is a detachable type motor having a motor, a battery made of a dry cell for supplying power to the motor, and a drive shaft driven by the motor and detachable from an engine crankshaft. A starter that operates an engine drive shaft by the motor, inserts the engine drive shaft into a hole provided in the engine portion, joins the crankshaft of the engine, rotates the crankshaft, and starts the engine It is configured to let you.

Japanese Utility Model Publication No.7-17962

However, since such a conventional detachable starter has a battery and a motor, there is a problem that the manufacturing cost increases and the weight increases.

Further, since the engine cannot be operated in the same manner when the power of the dry battery is cut off, there is a trouble that it is necessary to always pay attention to the remaining amount of the dry battery.

The present invention has been made in order to solve such a conventional problem, and the problem is that the manufacturing cost can be reduced, the weight can be reduced, and the engine can be started reliably. An object of the present invention is to provide a detachable starter that can be used.

In order to solve such a problem, the invention described in claim 1 is a detachable starter that is detachably attached to the engine unit and can start the engine, and includes a case having a main shaft and a rotation to the main shaft. The recoil rope is fixed and wound, and a recoil spring that can wind up the recoil rope is provided. The recoil rope rotates when the recoil rope is pulled out, and is reversed by the urging force of the recoil spring. It has a reel that can be wound up, and a drive unit that can transmit the rotation of the reel as a starting force to the crankshaft of the engine.

  In this case, when the accumulator having an accumulator spring is provided in the drive unit, and the rotational force of the reel is accumulated in the accumulator spring, the accumulator exceeds the force that can drive the crankshaft of the engine. You may comprise as what is called an accumulation type starter which releases the accumulation force of an accumulation spring at a stretch, and transmits to the crankshaft of an engine.

  In the first aspect of the invention, when necessary, the reel is rotated by attaching it to an engine unit of a drive working machine such as a mower and pulling the recoil rope to rotate the reel. The engine is started by transmitting a starting force to the crankshaft by the drive unit.

According to a second aspect of the present invention, the drive unit includes a holder fixed to the reel, and a starter shaft fixed to the holder and capable of transmitting a starting force to the crankshaft of the engine. Features.

Therefore, in the invention described in claim 2, when the reel is rotated by pulling the recoil rope, the starter shaft rotates through the holder.
As a result, in the invention described in claim 2, for example, the starter shaft is inserted into a starter shaft portion insertion hole provided in an engine portion of a drive working machine or the like, and is connected to the crankshaft of the engine. By pulling the rope, the rotation of the reel is transmitted as a driving force to the crankshaft, and the engine can be started.

According to a third aspect of the present invention, between the holder and the starter shaft, the reel and the starter shaft are brought into an engaged state when the recoil rope is pulled out, and the recoil spring is used to recoil the coil. A one-way clutch for releasing the engagement between the reel and the starter shaft when the rope is rewound is provided.
Accordingly, in the invention described in claim 3, when the recoil rope is pulled out, the starter shaft rotates and the rotation of the starter shaft is transmitted to the crankshaft. However, the recoil rope is moved by the recoil spring to the reel. The starter shaft is configured so as not to rotate when it is wound around.

According to the first and second aspects of the invention, since the battery and the motor are not provided, the manufacturing cost can be reduced, the weight can be reduced, and the operability can be improved.
In addition, since a battery as a drive power source is not required, the engine can be started regardless of the lack of battery power, and the engine such as a drive work machine can be started stably at all times. It becomes possible.
Furthermore, in the inventions according to claims 1 and 2, since it is detachable, unlike a starter that is always fixed to a conventional driven work machine body, it can be removed from the engine or drive part of the driven work machine body. Since the starter is not constantly subjected to vibration, the durability of the starter itself can be improved.
As a result, it is not necessary to design from the viewpoint of vibration resistance in consideration of vibrations from the engine and the drive part, so there is no need to perform vibration resistance design in terms of the material and mechanism of the constituent members, The production cost of the starter can be reduced.
In addition, when the starter is fixed to the drive type work machine, the starter is attached to the drive type work machine body in order to protect the starter from the work environment of the drive type work machine, for example, the work environment in a waterside or swamp. However, in the removable starter according to the present invention, it is only necessary to attach it to the main body of the driven work machine when the engine is started. It is not necessary to provide the structural member in the drive work machine body, and the manufacturing cost of the drive work machine can be reduced.

According to a third aspect of the present invention, since the starter shaft rotates when the recoil rope is pulled out by the one-way clutch, the starter shaft rotates when the recoil rope is pulled out. Although transmitted to the shaft, when the recoil rope is returned and unwound by the recoil spring, the starter shaft is configured not to rotate.

Therefore, when the one-way clutch is not equipped, the reel and the starter shaft are always in direct connection. Therefore, when the recoil rope is pulled out to the maximum, the recoil spring is then wound around the reel by the recoil spring. When the engine is started, both the reel and the starter shaft try to rotate. However, when the engine is started, the starter shaft is joined to the crankshaft of the engine. Therefore, the reel cannot rotate and the recoil rope is not wound.

Therefore, in order to take up the drawn recoil rope, it is necessary to remove the starter from the engine unit every time it is taken up, and the starter operation becomes very complicated.

When the one-way clutch is equipped as in the invention according to claim 3, when the reel is reversed by the urging force of the recoil spring to wind the recoil rope, the reel is rotated by the one-way clutch. Since it is not transmitted to the shaft, the recoil rope can be wound up while the starter body is mounted on the engine portion, and the next recoil rope drawing operation can be performed.
As a result, it is possible to avoid the above problem when the one-way clutch is not equipped.

The detachable starter according to the present invention will be described in detail below based on the embodiments shown in the accompanying drawings.
As shown in FIG. 1, the detachable starter 10 according to the present embodiment has an engine with a cell motor, for example, is mounted on an engine unit 40 of a drive working machine such as a mower, and the battery is raised. In such a case, it is used as an emergency for starting the engine.

As shown in FIG. 1, a starter shaft insertion hole 41 into which the starter shaft 11 of the detachable starter 10 according to the present embodiment is inserted is formed in the engine unit 40 of a drive working machine such as a mower. .
When the starter shaft 11 is inserted into the starter shaft insertion hole 41, the starter shaft 11 is coupled to the crankshaft or crank pulley of the engine unit, and the rotation of the starter shaft 11 is transmitted to the crankshaft or crank pulley. It is comprised so that.

A detachable starter 10 according to the present embodiment includes a case 13 having a main shaft 12, a recoil spring 15 that is rotatably fixed to the main shaft 12, has a recoil rope 14 wound thereon, and can wind the recoil rope 14. The reel 16 rotates in one direction when the recoil rope 14 is pulled out, and is reversed by the urging force of the recoil spring 15 to wind up the recoil rope 14. The reel 16 is fixed to the reel 16 and is driven. It has a starter shaft 11 constituting a drive unit that can transmit the rotational force of the reel 16 as a starting force of the engine to a crankshaft (not shown) of an engine such as a working machine.

The case 13 is made of synthetic resin and is formed into a short cylindrical cup shape by integral molding, and a hollow cylindrical main shaft 12 is erected at the center. The reel 16 is fixed to the main shaft 12 by a fixing screw 17 so as to be rotatable.
The reel 16 is made of synthetic resin, and includes a main shaft insertion portion 18, a recoil spring storage portion 19 formed at the lower end portion of the main shaft insertion portion 18, and a disk formed at the upper end portion of the main shaft insertion portion 18. And a holder holding plate portion 20 having a shape.

A recoil spring 15 is housed inside the recoil spring housing portion 19, a recoil rope 14 is wound around the main shaft insertion portion 18, and a base end portion of the recoil rope 14 is fixed at an appropriate position of the reel 16, The front end portion is arranged so that the operator can pull it, and at the time of starting the engine, the operator holds the front end portion of the recoil rope 14 and pulls the recoil rope 14 to rotate the reel 16.

A holder 21 is fixed to the upper surface of the holder fixing plate 20 by screws 22 and 22. The holder 21 is formed in a substantially disc shape as a whole, and a starter shaft fixing cylinder portion 23 is erected at the center, and the starter shaft 11 is press-fitted and fixed in the starter shaft fixing cylinder portion 23.
Therefore, in the detachable starter 10 according to the present embodiment, when the operator pulls the recoil rope 14, the reel 16 rotates, and at the same time, the holder 21 and the starter shaft 11 rotate.

  Therefore, when the engine is started using the detachable starter 10 according to the present embodiment in a drive work machine or the like, the starter shaft insertion hole 41 appropriately opened in the engine unit 40 of the drive work machine. With the starter shaft 11 inserted therein, the reel 16, the holder 21 and the starter shaft 11 are rotated by pulling the recoil rope 14, thereby rotating the starter shaft 11 to the crankshaft of the engine. The engine can be started by transmitting force and rotating the crankshaft.

When the engine does not start with one stroke of pulling the recoil rope 14, it is necessary to reverse the reel 16 by the urging force of the recoil spring 15 and wind up the recoil rope 14, but the starter shaft 11 is connected to the engine section. In the state where it is inserted into the starter shaft insertion hole 41 of 40 and connected to the crankshaft of the engine, the load on the engine side is larger than the urging force of the recoil spring, so the reel 16 does not rotate. .

  Therefore, in order to wind up the recoil rope 14, it is necessary to remove the starter shaft 11 from the starter shaft insertion hole 41 of the engine unit 40 and remove the detachable starter 10 from the engine unit.

Accordingly, the detachable starter 10 is detached from the engine unit 40, the recoil rope 14 is wound up, and then the starter shaft 11 is inserted again into the starter shaft insertion hole 41 of the engine unit 40, and the recoil rope 14 is pulled out to start the shaft. 11 is rotated to transmit the rotational driving force of the starter shaft 11 to the crankshaft of the engine to start the engine.

2 and 3 show a second embodiment of a detachable starter according to the present invention.
The detachable starter 30 according to the present embodiment is based on the basic configuration of the detachable starter 10 according to the above embodiment, and includes a starter shaft fixing cylinder portion 23 formed on the holder 31 and the starter shaft 34. In the meantime, when the recoil rope 14 is pulled out, the reel 32 and the starter shaft 34 are connected to transmit the rotation of the reel 32 to the starter shaft 34, and the recoil rope 14 is wound by the recoil spring 15. When returning, a one-way clutch 33 that releases the connection between the reel 32 and the starter shaft 34 and does not transmit the rotation of the reel 32 to the starter shaft 17 is provided.

  That is, in the present embodiment, the one-way clutch 33 is a so-called needle-type one-way clutch, and only when the reel 32 rotates in the rotation direction when the recoil rope 14 is pulled out, The starter shaft 34 is connected to transmit the rotation of the holder 31 fixed to the reel 32 to the starter shaft 34, and the reel 32 is reversely rotated by the urging force of the recoil spring 15 to wind the recoil rope 14. At this time, the connection between the holder 21 and the starter shaft 17 is released, and the reel 32 rotates backward to wind up the recoil rope 14, but the rotation of the holder 31 is not transmitted to the starter shaft 34. It is configured as follows.

  Therefore, when the engine is started using the detachable starter 30 according to the present embodiment, the starter shaft 34 is inserted into the starter shaft insertion hole 41 of the engine unit 40 to be used as an engine crankshaft or crank pulley. When the operator pulls out the recoil rope 14 with the starter shaft 34 connected, the one-way clutch 33 transmits the rotation of the reel 32 to the starter shaft 34 via the holder 31. The rotational driving force of the starter shaft 34 is transmitted to the crankshaft or crank pulley of the engine.

On the other hand, if the engine does not start during the stroke of the pull-out operation of the recoil rope 14, it is necessary to reverse the reel 32 by the urging force of the recoil spring 15 and wind up the recoil rope 14. In this case, the reel At the time of reversing 32, the rotational force of the reel 32 is not transmitted to the starter shaft 34 by the one-way clutch 33.
Therefore, the starter shaft 34 is inserted into the starter shaft insertion hole 41 of the engine unit 40 and is joined to the crankshaft or crank pulley of the engine, and the starter shaft 34 does not rotate, and only the reel 32 is provided. Reversely rotates and winds up the recoil rope 14.

As a result, unlike the case of the above-described embodiment, the operator does not remove the removable starter 30 from the engine unit 40 and keeps the removable starter 30 mounted on the engine unit, and the next recoil rope 14 The engine can be started by pulling out the engine.
Moreover, in this embodiment, the detachable starters 10 and 30 according to the present invention are not the accumulator type, but rotate the reels 16 and 32 by the recoil rope 14 and simultaneously rotate the crankshaft or the crank pulley. However, the present invention is not limited to the above-described embodiment, and the accumulated force is such that the rotational driving force of the reels 16 and 32 can be accumulated in the accumulation spring to start the crankshaft. When it arrives, the engine may be started at once by releasing the stored force and rotating the crankshaft or the crank pulley.
Further, in the above-described embodiment, the case where the one-way clutch 33 is configured by a needle-type one-way clutch has been described as an example. However, the present invention is not limited to the above-described embodiment, and is a one-way clutch of another form. Even can be applied.

When configured as such a power accumulation type starter, it is possible to provide a detachable starter with better operability by further reducing the pulling force of the recoil rope.
Moreover, in the said embodiment, although the case where the engine of drive-type working machines, such as a mower, was started using the detachable starter 10 and 30 which concerns on this invention was demonstrated to an example, it is limited to the said embodiment. For example, it can also be used when starting an engine of a model airplane equipped with a reciprocating engine, and can be widely applied to work equipment that uses a reciprocating engine.

  The detachable starter according to the present invention can be widely applied to work equipment equipped with a reciprocating engine.

It is a cross-sectional view showing an embodiment of a detachable starter according to the present invention. It is a cross-sectional view showing a second embodiment of a detachable starter according to the present invention. It is a top view which shows 2nd embodiment of the detachable starter which concerns on this invention.

Explanation of symbols

10 Detachable starter device
11 Starter shaft (drive unit)
12 Main shaft 13 Case 14 Recoil rope 15 Recoil spring 16 Reel 18 Main shaft insertion portion 17 Fixed screw 19 Recoil spring storage portion 20 Holder fixing plate portion 21 Holder 22 Screw 23 Starter shaft fixing cylinder portion 30 Removable starter 31 Holder 32 Reel 33 One-way clutch 34 Starter shaft

Claims (3)

  A detachable starter that is detachably mounted on the engine unit and can start the engine, and includes a case having a main shaft, a rotary coil fixed to the main shaft, and a recoil rope wound around the case. A recoil spring that can be taken is housed, and when the recoil rope is pulled out, it rotates when it is pulled out. A detachable starter comprising a drive unit capable of transmitting as force.   2. The detachable starter according to claim 1, wherein the drive unit includes a holder fixed to the reel and a starter shaft fixed to the holder and capable of transmitting a starting force to a crankshaft of the engine. .   Between the holder and the starter shaft, when the recoil rope is pulled out, the reel and the starter shaft are connected to transmit the rotation of the reel to the starter shaft, and the recoil spring is used to transmit the recoil rope. A one-way clutch configured to release the connection between the reel and the starter shaft and prevent the rotation of the reel from being transmitted to the starter shaft when the reel is rewound. The detachable starter according to claim 2.

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