JP2004263674A - Engine starter device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an extremely safe and reliable engine starter device for preventing unconsidered starting of an internal combustion engine. <P>SOLUTION: This engine starter device comprises a rope reel turned by a rope, a first mainspring for recoil rolled by turning the rope reel, a second mainspring for driving an engine crankshaft, an engine starting pulley driven by the second mainspring, and a centrifugal clutch disposed between the engine starting pulley and the crankshaft. At the completion of rope return by the first mainspring, the spring force of the second mainspring is set at zero. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an engine starter device, and more particularly to an engine starter device capable of zeroing the accumulated power of a crankshaft driving spring of an engine at the end of recoiling.
[0002]
[Prior art]
In a conventional recoil starter device, it is general that a rope pulley is rotated by a recoil rope, and this rotation is directly transmitted to a crankshaft of an engine via a centrifugal clutch to be activated. This recoil starter requires a rope to pull the rope at the desired rotational speed and at a stretch, making it difficult for people with weak power to operate.Therefore, it is not possible to start with a medium-sized engine that uses a recoil starter such as an outboard motor generator. In addition, the conventional recoil starter, which is directly connected to the crankshaft, has a drawback that it is difficult to pull the recoil rope easily and smoothly depending on the degree of the load because the air pressure inside the internal combustion engine cylinder fluctuates. There was.
[0003]
Further, there is a starter using a cell-type motor or a starter using a one-way clutch and a start spring to manually repeat recoil and increase the accumulated energy of the start spring each time a recoil is started (Patent Document 1). ).
[0004]
[Patent Document 1]
JP-A-7-174061 (page 1, FIG. 1).
[0005]
[Problems to be solved by the invention]
The former cell type motor starter has a complicated structure and is expensive, and requires a charging mechanism.Easy start-up but insufficient charging and other unavailability may cause an emergency in outboard motors. A conventional recoil starter is separately installed for use.
[0006]
In addition, the latter has a one-way clutch, and has a function to gradually increase the storage power of the start spring by several recoils and start the engine.The starter stores the start spring at the end of the recoil rope return process. It is characterized by remaining power, and naturally occurs when a large amount of power is not stored until the engine is started.
[0007]
On the other hand, when the rotational torque of the internal combustion engine becomes irregular and the internal combustion engine piston rises and the air in the combustion chamber is compressed, air leaks from the split ring seal around the piston and the pressure drops, causing the engine crankshaft to rotate. Load is reduced. In such a case, there is a possibility that an unexpected start of the engine may occur due to the fact that the above-mentioned accumulated power is large and the reduction of the load overlaps.
[0008]
Further, there is a change in the number of revolutions due to an increase or decrease in the flow rate of the fuel, thereby increasing the probability of the unexpected start described above. As a result, there is a possibility that the working machine having the cutting tool or the dangerous material attached thereto may cause serious harm.
[0009]
The present invention has been made to eliminate such disadvantages.
[0010]
[Means for Solving the Problems]
An engine starter device according to the present invention includes a rope reel rotated by a rope, a first spring for recoil provided on the rope reel and wound by the rotation of the rope reel, and a second spring for driving a crankshaft of the engine. , An engine starting pulley driven by the second mainspring, and a centrifugal clutch interposed between the engine starting pulley and the crankshaft. When the first spring returns the rope, the second mainspring is used. Is characterized in that the spring force is zero.
[0011]
Further, the engine starter device of the present invention has means for directly connecting the starting pulley and the rope reel, and can be used as a recoil starter for starting the engine with the pulling force and the rotation speed of the rope. It is characterized.
[0012]
Further, the engine starter device of the present invention is characterized in that a fixed lid located on the side of the starting pulley of the second mainspring is provided on the rope reel.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0014]
FIG. 1 shows an engine starter device of the present invention, wherein 1 is a rope which is manually operated, 2 is a rope reel which is rotated by the rope 1, and 3 is a recoil for one side which is also wound by the rope reel 2. A first mainspring 4 is a second mainspring for driving the crankshaft of the engine on the other side, 5 is a starting pulley rotated by the second mainspring 4, and 6 is between the starting pulley 5 and the crankshaft of the engine. An interposed centrifugal clutch, 7 is a fixed starter housing surrounding the engine starter device of the present invention, and 8 is a sintered oil-impregnated metal or the like by the starter housing 7 for rotatably supporting the rope reel 2 and the starting pulley 5. A support shaft rotatably supported via a bearing 9, a female screw 10 formed in the center of the support shaft 8 in the axial direction, and a female screw 11 The connecting screws 12 screwed to 0 are pressed by the connecting screws 11 to connect the rope reel 2 and the starting pulley 5 directly, and a connecting member 13 such as a leaf spring is engaged with the connecting member 12. A groove or projection formed on the inner peripheral surface of the shaft portion of the rope reel 2, a groove or projection formed on the end surface of the cylindrical portion 5 a of the starting pulley 5, and a connection portion 15 for connecting the coupling member 12 to the support shaft 8. Reference numeral 16 denotes a mounting bolt of the arm, and reference numeral 17 denotes a fixed cover fixed to the rope reel 2 so as to be located on the starting pulley 5 side of the second mainspring 4.
[0015]
Since the engine starter device of the present invention is configured as described above, when starting the internal combustion engine, the rope 1 is pulled by hand to rotate the rope reel 2. The rotation of the rope reel 2 winds the first mainspring 3 for recoil and, at the same time, the second mainspring 4 for driving the crankshaft of the engine.
[0016]
According to the present invention, the rope 1 is designed to be large enough to rotate the crankshaft of the internal combustion engine with the torque accumulated in the second mainspring 4 by a single pulling operation of the rope 1, and the rope 1 is designed so that the first mainspring 3 The second spring 4 is also rewound at the same time when it is rewound by the action of, so that the accumulated power of the second mainspring 4 is made zero.
[0017]
【The invention's effect】
Since the engine starter device of the present invention has the above-described configuration, the accumulated power of the second mainspring 4 becomes zero simultaneously with the end of recoiling, so that the above-mentioned conventional disadvantage that the internal combustion engine is started carelessly can be eliminated.
[0018]
In the conventional device, when the second mainspring 4 is damaged or stops functioning, it becomes impossible to start the internal combustion engine. In this case, the connecting screw 11 screwed to the shaft of the support shaft 8 is used. When tightened, the tip of the coupling screw 11 pushes up the coupling member 12 such as a leaf spring as shown in FIG. 2, and engages with the groove or projection 13 of the rope reel 2 and the groove or projection 14 of the starting pulley 5, and as a result, The shaft portion of the rope reel 2 is directly connected to the starting pulley 5, so that the rope 1 can function as a conventional recoil starter by pulling the rope 1, which is extremely safe and highly reliable.
[Brief description of the drawings]
FIG. 1 is a sectional view of an engine starter device of the present invention.
FIG. 2 is a sectional view for explaining the operation of the engine starter device shown in FIG.
[Explanation of symbols]
Reference Signs List 1 rope 2 rope reel 3 first spring 4 for recoil 4 second spring 5 for driving crankshaft of engine 5 starting pulley 5a cylindrical portion 6 centrifugal clutch 7 starter housing 8 support shaft 9 bearing 10 internal thread 11 coupling screw 12 coupling member 13 Groove or protrusion 14 Groove or protrusion 15 Arm 16 Mounting bolt 17 Fixing lid

Claims (3)

A rope spring rotated by a rope, a pair of a first spring for recoil provided on the rope reel and wound by rotation of the rope reel, a second spring for driving a crankshaft of the engine, and a second spring And a centrifugal clutch interposed between the engine start pulley and the crankshaft. When the first spring returns the rope, the spring force of the second spring is reduced to zero. An engine starter device, characterized in that: An engine starter device comprising: means for directly connecting the starting pulley and the rope reel; and being capable of being used as a recoil starter for starting an engine with a pulling force and a rotation speed of a rope. 3. The engine starter device according to claim 1, wherein a fixed lid located on the side of the starting pulley of the second mainspring is provided on the rope reel.

Images