JPS63289260A - Starter for small-sized engine - Google Patents

Abstract

PURPOSE:To lightly start an engine by installing a starter switch which is closed only during the operation for pulling out the rope of a recoil starter and carrying out cranking by driving a starter motor on closing the starter switch. CONSTITUTION:A rope 25 which constitutes a recoil starter is strongly pulled out by gripping a grip 25A on starting an engine, and a reel 23 is revolved, and then a ratchet 26 is driven out nearly linearly through the engagement between spiral teeth 23B and the spiral groove 26A of a ratchet 26. Therefore, a ratchet hook 26X is meshed with a ratchet hook installed onto a crankshaft, and a turning moment is transmitted onto a crankshaft. Also, at this time, a switch 29 for starter motor is turned ON through the interlocking through an operating lever 28, and a starter motor is revolved. Since the power of the motor is transmitted to a crankshaft through a ratchet, etc., the engine is cranking-operated lightly.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a starting device for a small engine, and more particularly to a starting device for a small engine that includes a recoil starter and a starter motor, and in which the recoil starter and starter motor work together to start the engine.

[Conventional technology]

Many of the small-displacement engines used as power sources for power sprayers and brush cutters, so-called small engines, are equipped with both a recoil starter or starter motor as a starting device, and an independently operated starter. During work, the crankshaft is rotated and started by either pulling out the recoil starter rope forcefully or activating the starter motor.

[Problems to be solved by the invention]

The above-mentioned starting device does not pose much of a problem when operated by a worker who has the physical strength to pull out the recoil starter rope with force, but when operated by a female or elderly worker, the starting device may exceed the load of the engine's compression stroke. It is very difficult to turn the crankshaft, and starting work becomes a big burden. Also,
Items that can be started with a starter motor require a large-capacity, large and heavy starter motor to rotate the crankshaft beyond the load of the compression stroke, and are installed in portable working machines such as power sprayers and brush cutters. There were restrictions on equipping a small engine with a small displacement with a starter motor.

[Means to solve the problem]

Therefore, in order to reduce the work burden when starting a small engine and the burden of carrying it during work, this invention is equipped with a recoil starter and a starting motor, and the recoil starter and starting motor work together to easily operate the engine. The purpose of this system is to provide a starting switch that is closed only when the recoil starter is pulling out the rope, and a starting motor that rotates when the starting switch is closed. , a rope pulling operation of the recoil starter, and an output of a starting motor that closes and rotates the starting switch only when the rope is being pulled.
The invention is characterized in that it is constructed so that the crankshaft is driven by the simultaneous cooperation of the two.

【Example】

Embodiments of the present invention will be described below with reference to the accompanying drawings. In FIG. 3, numeral 10 is an engine main unit;
20 is a recoil starter unit, 30 is a centrifugal clutch unit provided on the output shaft of the engine, and 40 is a centrifugal clutch unit provided on the output shaft of the engine.
1 and 2 respectively show cell starter units installed adjacent to the centrifugal clutch unit 30. The engine main unit 10 has one end of a crankshaft 11 that functions as a one-way clutch and is configured to be able to be engaged with and detached from the recoil starter unit 20, and the other end that constitutes a centrifugal clutch 13. The clutch shoe is installed. In the recoil starter unit 20, a reel 23 is rotatably attached to a shaft 22 provided at the center of a starter case 21 attached to the engine main unit 10, one end is locked to the reel 23, and the other end is fixed to the shaft 22. The reel 2 is locked by the starter case 21 or by the coil spring 24.
3, a rotational behavior is given to the winding direction of the row 125 wound thereon. A grip 25A that serves as a grip when starting the engine is fixed to the end of the rope 25, and by pulling the rope 25, the reel 23 can be rotated. This reel 23 has a cylindrical boss part 23A in the center, has spiral teeth 23B inside this boss part 23A, and has a spiral groove 26^ that meshes with the spiral teeth 23B as a one-way clutch of a feeding type. The ratchet 26 is fitted into the boss portion 23A, and the reel 2
3 and the ratchet 26 are connected by a spiral tooth 23B and a spiral groove 26A. The center of this ratchet 26 has a hollow cylindrical shape, and the inner surface thereof has a groove 26 into which a protrusion 278 of the rotor 27 pivotally supported on the shaft 22 is fitted.
B is formed, and this rotor 27 has a spring 27B and a shaft 22
A friction behavior is provided by the disc 27C bolted to the ratchet 26, and the ratchet 26 is allowed to move in the axial direction. A ratchet pawl 26 is attached to the end surface of the ratchet 26.
An X is formed so that the ratchet pawl (not shown) of the crankshaft 11 meshes with the ratchet pawl (not shown) only when rotating in one direction. At the beginning of the rotation of the reel 23, since the spiral teeth 23B and the spiral groove 26A of the ratchet 26 are engaged in the rotation direction, the ratchet 26 tries to rotate together with the reel 23, but on the other hand, the rotor 27 27B and the disc 27C, and the ratchet 26 is frictionally fixed to the rotor 27 by the concave groove 26B and the protrusion 27.
Since the ratchet 26 and the rotor 27 are engaged with each other in the rotational direction, as the reel 23 rotates, the ratchet 26 rotates due to the rotation of the helical teeth 23B and the retention of the helical groove 26A. Under the resulting feeding action, it is further concave.
2f3B is guided by the protrusion 27A and protrudes substantially linearly until the inner bottom surface of the ratchet 26 comes into contact with the disk 27C, as shown by the two-dot chain line in FIG. and,
Further rotation of the reel 23 causes both the reel 23 and the ratchet 26 to move against the friction acting on the rotor 27.
The two rotors 27 rotate in conjunction. The ratchet 26 has a stopper 2f3Y for the end surface of the boss portion 23A of the reel 23, and one end 28A of the switch operation lever 28 is in elastic contact with the outside of this stopper 26Y. This switch operation lever 28 is pivotally connected to a starter motor switch 29 installed inside the starter case 21, and the operator 29^ outside of this pivot point is connected to the switch operation lever 28. It can be pushed at the end 28B. The other end (output shaft) of the crankshaft 11 extends into a housing 12 attached to one side of the engine main unit 10 and is supported by the crankcase of the unit 10 by a bearing 32. Boss part 12A
This is true. A large gear 33 is fitted into the boss portion 12A of the housing 12, and a ratchet 34 having an oval fitting hole 34A is attached to the boss portion 33.
The fitting hole 34A is loosely fitted into the hole 34A. A convex portion 33B that accommodates the torsion spring 34B is provided on the boss portion 33A, and a concave portion 34 provided on the ratchet 34
It's stuck in G. Further, an engagement groove 34D is provided around the ratchet 34, and a pawl 35A of the friction plate 35 fitted to the boss portion 12A of the housing 12 is fitted into the engagement groove 340. The friction plate 35 is given frictional behavior in the extrusion direction by a push spring 35B. Furthermore, an engagement protrusion 34E is provided at a position approximately 90 degrees apart from the engagement groove 340 of the ratchet 34, and this engagement protrusion 34E is attached to a boss portion 36A of a clutch shaft 36, which will be described later. The engagement plate 36B comes into contact with the engagement plate 36B. At the beginning of the rotation of the large gear 33, the boss portion 33A of the large gear 33 is moved to the right side of the oval fitting hole 34A of the ratchet 34, as shown by the solid line in FIG. 34
Since the convex portion 33B of the large gear 33 fits into the concave portion 34C of the ratchet 34, the concave portion 34C side of the ratchet 34 tries to rotate together with the large gear 33, but on the other hand, the engaging groove 3 of the ratchet 34
A pawl 35A of a friction plate 35 is fitted into 4D, and this friction plate 35 receives friction due to the action of a push spring 35B, and while it does not rotate together with the large gear 33, the engagement groove 340 side of the ratchet 34 remains there. As a result, as shown by the two-dot chain line in Fig. 7, the large gear 3
The boss portion 33A of No. 3 is the oval fitting hole 34 of the ratchet 34.
^ It will be in a state closer to the left side, and the engaging protrusion 34E will protrude. Then, due to further rotation of the large gear 33, the large gear 33
Both ratchet 34. The friction plate 35 rotates in conjunction. A clutch drum 37 is arranged around the clutch shoe 36.
are arranged to constitute the centrifugal clutch unit 13, and this clutch drum 37 is connected to the transmission shaft 38 of the brush cutter and is rotatably mounted in the internal space of the pipe holder 31A that fixes the end of the main operating rod 39. It is pivoted. A starter motor casing 31B is provided in the clutch housing 31 that is integrated with the pipe holder 31^, and a starter motor 41 constituting the starter motor unit 40 is accommodated therein together with a rechargeable battery 42, and the starter motor casing 31B is housed inside the starter motor casing 31B. The output @41A of the motor 41 extends toward the large gear 33, and a pinion 43 attached to the output shaft 41^ meshes with the large gear 33, so that the starter motor 41 is rotated when the starter switch 29 is closed. It has become. Next, a description will be given of the actual operation of the small engine starting device according to the present invention. First, grip the grip 25A and forcefully pull out the row 125 constituting the recoil starter to rotate the reel 23. As the reel 23 rotates, a feeding action of the ratchet 26 occurs between the helical teeth 23 and the helical groove 26 of the ratchet 26 meshing with it, and the concave groove 26 formed on the inner surface of the ratchet 26 is generated.
Since B is fitted into the protrusion 27A of the rotor 27, the ratchet 26 is extended almost linearly, and its ratchet pawl 2
6X attempts to rotate the crankshaft 11 by engaging with a ratchet pawl provided on the crankshaft 11. At this time, due to the feeding action of the ratchet 26, the stopper 26
Y is extended together with the switch operation lever 28, and the end 28B
Turn on the starter motor switch 29 via its operator 29A. When the starter motor switch 29 is turned on, the starter motor 41 rotates, and the large gear 33 is started to rotate by the pinion 43 provided on the output shaft 41A. , then,
The ratchet 34 is rotated against the torsion spring 34B.
The engaging protrusion 34E is deviated to the state shown by the imaginary line in the figure, and the engagement protrusion 34E is Δ! This engagement protrusion 34E catches the engagement plate 36B that protrudes into the rotation area of the ratchet 34 from the boss part 36^ of the clutch shoe 36, and the boss part 36 of the clutch shoe 36
Starting torque is input to the crankshaft 11 via 6A. In other words, the rope 25 is pulled out manually and the reel 23
As the ratchet 26 rotates, the ratchet 26 is extended,
During this feeding, the switch 29 is closed, and as a result, when the starter motor 41 rotates, the large gear 33 rotates via the pinion 43, the ratchet 34 extends while rotating, and the engagement protrusion 34E abuts the engagement plate 36B. At approximately the same time, the ratchet 26 also engages with a ratchet pawl provided on the crankshaft 11. The crankshaft 11. and engagement plate 36B, boss portion 3
The crankshaft (output shaft) 11 is driven via 6A,
The engine is started. When the engine stops pulling the rope 25, the reel 23 rotates in the opposite direction by the recoil spring 24 and winds up the row 125, and the ratchet 26 is pulled back to release the engaged state and the switch 29 will be held. At the same time, the starter motor 41° pinion 43. The rotation of the large gear 33 is stopped, and the ratchet 34 is also
It stops with 4E hanging out. Then, as the crankshaft (output shaft) 11 rotates, the engagement plate 36B rotates and abuts against the back of the engagement protrusion 34E. is moved out of the rotation locus of the engagement plate 36B. In the above explanation, an example has been given in which a brush cutter is equipped with the small engine starting device of the present invention. Of course, it can be applied to engines.

【Effect of the invention】

As is clear from the above description, according to the small engine starting device of the present invention, in a small engine equipped with a recoil starter, the power supply circuit of the starter motor is activated in conjunction with the rope drawing operation only during the rope drawing operation. By closing and rotating the recoil starter, the rotational torque of the recoil starter and the rotational torque of the starter motor are simultaneously transmitted to the crankshaft to drive the crankshaft, so the rope of the recoil starter is pulled out at once. Even a weak woman or woman can reliably start the engine by operating the starter using a weak pulling force. Since starting is due to the simultaneous cooperation of the recoil starter and the starter motor, the starter motor is
There is no need for a large, heavy item with a large capacity; instead, a small, light, and small capacity item is sufficient.At the same time, the power consumption of the starter motor is low, and the power source is also light, making it the power source for portable work equipment such as power sprayers and brush cutters. When installed as a power source, the burden on carrying can be reduced.

[Brief explanation of the drawing]

The accompanying drawings show an embodiment of the present invention, in which Fig. 1 is a cross-sectional view of the small engine coil starter portion, Fig. 2 is a cross-sectional view of the centrifugal clutch portion, Fig. 3 is a side view of the small engine, and Fig. 4 is a sectional view of the small engine coil starter portion. The figures are a cross-sectional view taken along the line IV--IV in Figure 1, a cross-sectional view showing the relationship between the ratchet and the starter motor switch, Figure 6, a cross-sectional view taken along the line Vl-VI in Figure 2, and Figure 7. is a cross-sectional view taken along arrows 2--2 in FIG. 10... Engine main unit 11... Output shaft, 12... Housing, 12A...
・Boss part, 13... Centrifugal clutch 20... Recoil starter unit 21... Starter case, 22... Shaft, 23...
Reel, 23A...Boss part, 23B...Spiral teeth, 2
4... Recoil spring, 25... Rope, 25^...
・Grip, 26... Ratchet, 26A... Spiral groove, 26B... Concave groove, 26X... Ratchet pawl, 2
6Y...stopper, 27...rotor, 27^...
Projection, 27B... Spring, 27C... Disc, 28...
・Switch operation lever, 28A, 28B... end,
29... Starter motor switch, 29A... Operator 30... Centrifugal clutch unit 31... Clutch housing, 318... Pipe case holder, 31B... Starter motor casing 1
．． 32... Bearing, 33... Large gear, 33A... Boss portion, 33B... Convex portion, 34... Ratchet, 34
A... Fitting hole, 34B... Torsion spring, 34C
... recess, 34D ... engagement groove, 34E ... engagement projection, 35 ... friction plate, 35A ... pawl, 35B ... pressure spring, 36 ... clutch shoe, 3
6A... Boss part, 36B... Engagement plate, 37... Clutch drum, 38... Transmission shaft, 39... Main operating rod 40... Cell starter unit 41... Starter motor, 42 ... Rechargeable battery patent applicant Fujiguchibin Co., Ltd. agent Patent attorney
Makoto Kobashi, Patent Attorney Susumu Murai Figure 1

Claims (1)

[Claims] (1) In a small engine equipped with a recoil starter, a starting switch that is closed in conjunction with the rope pulling operation only during the rope pulling operation of the recoil starter, and a starting motor that rotates when the starting switch is closed; A starting device for a small engine configured to drive a crankshaft through the simultaneous cooperation of a rope pulling operation of a recoil starter and the output of a starting motor that rotates only when the starting switch closes when the rope is being pulled.