JPH048313Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field]

This invention relates to a cell starter device for an engine for a portable working machine, and more specifically to a cell starter device suitable for relatively small engines such as brush cutters and power sprayers.

[Conventional technology]

Most of the engines of portable working machines such as brush cutters are equipped with a recoil starter device as a starting device, and engines equipped with a cell starter device driven by a motor are not very popular due to reliability problems. However, as the demand for a cell starter device that is convenient and easy for women, women, and the elderly to operate has increased, and the reliability of batteries and starter motors has become higher, cell starter devices have been provided. An example of a recently proposed cell starter device is Japanese Utility Model Publication No. 58-23007.

[Problem that the idea aims to solve]

In a cell starter device, the pinion meshes with the ring gear to drive the flywheel only when the engine is started, and since the cell starter's cell motor is small in order to turn the heavy flywheel, a high-speed type is used. However, if the pinion rotates at high speed before meshing, the meshing synchronization with the ring gear will be poor, causing problems such as gear noise and, in severe cases, tooth loss. Therefore, this invention attempts to make it easier to engage and more reliably start the rotation of the ring gear by controlling the rotation of the pinion that constitutes the cell starter device, which is one of the operations associated with starting the engine.

[Means to solve the problem]

In order to achieve the above-mentioned purpose, this invention is a cell starter device for an engine for a portable working machine that is configured to start by meshing a pinion of a starter motor with a ring gear provided on a flywheel. It is characterized by comprising a starting motor provided on the shaft and a motor drive circuit whose supplied power increases in proportion to the pushing stroke of the starting motor in the axial direction, so that the speed of the pinion is increased by pushing the starting motor. It is something.

【Example】

Examples of this invention will be described below with reference to the drawings. Reference numeral 10 indicates a brush cutter as a representative of portable working machines, in which a cutting blade unit 12 is attached to the tip of the main operating rod 11, and an engine 13 as a power source is attached to the other end. The engine output can drive the cutting blade 12A via a transmission shaft 14 inserted along the axis of the main operating rod 11. A coupling tool 16A for coupling the shoulder strap 15 is attached to the middle part of the main operating rod 11, and a coupling tool 15A provided on the shoulder strap 15 can be hooked to this coupling tool 16A. There is. Two grips 16 are provided in the middle of the main operating rod 11 for the operator to hold, and the brush cutter can be supported by the grips 16 and by the shoulder band 15. The shoulder band 16 is equipped with a battery 17, which can be connected to a power supply terminal 20A of a cell starter device 20 installed in the engine 13 via a power supply line 17A and a plug 17B, so that power can be supplied to the starter motor. The starter starter device 20 has a starter motor 22 housed in a cylindrical housing 21 attached to a clutch housing 18 of the brush cutter. In this housing 21, the internal space is continuous with the bulging part 21A, and the cylindrical part 21B is connected to the stepped part 21X.
The starter motor 22 has a protruding part 22B provided in the longitudinal center portion of the casing 22A that can be fitted into the cylindrical part 21B.
It is located in 1A. A cylindrical protrusion 22C serving as a push button is provided on the end face of the casing 22A, and protrudes outward from a window hole bored in the end face of the housing 21. Flange 22 of casing 22A
B has a pair of contacts 23 made of conductive metal.
A, 23B are attached and their ends are connected to the windings of the starter motor, and the resistance element 24 and conductive terminal 25 provided in the bulge of the housing 21 are attached.
It is now possible to contact each of them. The resistive element 24 is attached to the core 24A, and the core 24A is fixed to the terminal 24C by a caulking member 24B, and the resistive element 24 is fixed inside the housing 21 facing the conductive terminal 25, and the core 24A is fixed to the terminal 24C by a caulking member 24B. 23A and 23B are movable in contact with the resistance element 24 and the conductive terminal 25, respectively. A shallow step 22X is formed in the casing 22A of the starter motor 22 in the circumferential direction.
The push spring 26 whose one end is in contact with 2X pushes the starter motor 22 so that the protrusion 22C is always in
The habit is given to the more protruding direction. Further, a pinion 27 is attached to the output shaft 22D of the starter motor 22, and when the starter motor 22 is pushed in with a thumb or the like through the protrusion 22C against the elasticity of the push spring 26, the pinion 27 moves into the housing 22D.
The flywheel 19 can be seen through a window hole 21C drilled in the end face of the flywheel 19 and moved to a meshing area with a ring gear 19A formed around the flywheel 19. That is, by pushing the protrusion 22C, the starter motor 2
2, the contacts 23A and 23B provided on the casing 22A of the starting motor 22 move along the resistance element 24 and the conductive terminal 25, respectively, and the battery 17, the power supply line 17A, and the plug 17 are moved.
The starter motor 22 is driven with its rotational speed controlled by a motor drive circuit (FIG. 4) including B. In other words, the pinion 27 is the ring gear 18A.
In the position where the contact 23A is fully engaged with the resistor 24, the contact 23A contacts the resistance value "zero" position of the resistor 24,
When the pinion 27 is at the farthest position from the ring gear 18A, that is, when the starter motor 22 is pushed back together with the casing 22A by the push spring 26, the contact 23A is separated from the resistance element 24, and the contact 23B is separated from the conductive terminal 25. The pushing stroke of starter motor 22 and the lengths of resistance element 24 and conductive terminal 25 are determined in relation to each other. Next, the engine starting operation using the cell starter device of this invention will be explained. First, the plug 17B connected to the battery 17, which is a power source, is connected to the power supply terminal 20A of the cell starter device 20. When the protrusion 22C of the cell starter device 20 is pushed in with a fingertip, it does not rotate at first because the motor drive circuit is open (Fig. 5), but the pinion 27
At the position immediately before meshing with the ring gear 18A, the starter motor 22 moves together with the casing 22A, and the contacts 23A and 23B contact the resistive element 24 and the conductive terminal 25, respectively (FIG. 6), and the motor drive circuit is closed and the starter motor 22 moves together with the casing 22A. Motor 22 starts rotating, but since the resistance value is large at first, motor 2
The power supplied to 2 is small, so the pinion 27 is rotated slowly. Furthermore, abutment 2
When 2C is pushed in, contact 23A and resistance element 2
By changing the contact position of 4, the resistance value decreases and the electric power supplied to the starter motor 22 increases,
The rotational speed of the pinion 27 also increases (FIG. 7). Eventually, the pinion 27 is pushed out from the window hole 21C and meshes with the ring gear 18A.
When the engine is started by turning , and then the pushing of the protrusion 22C is released, the starter motor 22 moves backward together with the casing 22A due to the elasticity of the push spring 26, and the pinion 27 comes off from the ring gear 18A. In the above description, a brush cutter was used as an example of a portable working machine, but the present invention can also be applied as a cell starter device for an engine such as a power sprayer.

[Effect of the idea]

As is clear from the above explanation, the cell starter device for a portable working machine engine of this invention is provided with a pinion on the output shaft of the starter motor, which meshes with the ring gear to drive the motor, and starts the motor. It is configured to be driven by a starter motor drive circuit that reduces resistance in conjunction with the pushing work involved in operation, so the pinion, which rotates slowly at first, engages the ring gear and then rotates at high speed to start the engine. There are effects such as smooth meshing with the ring gear.

[Brief explanation of drawings]

FIG. 1 is an overall perspective view of a brush cutter equipped with a cell starter device according to this invention, FIG. 2 is a partially cutaway side view of the cell starter device, FIG. 3 is a perspective view of the same, and FIG.
The figure is a motor drive circuit diagram, and FIGS. 5 to 7 are cross-sectional views showing changes accompanying a starting operation of the engine starting device. 10...Brush cutter, 11...Operating lever, 12...
Mower blade unit, 12A...Mower blade, 13...Engine, 14...Transmission shaft, 15...Shoulder band, 1
5A...Connector, 16...Grip, 16A...
Connector, 17...Battery, 17A...Power line, 17
B...Plug, 18...Clutch housing, 1
9...Flywheel, 19A...Ring gear,
20...Cell starter device, 20A...Power supply terminal, 21...Housing, 21A...Bulging portion, 2
1B... Cylindrical part, 22... Cell motor, 22A...
...Casing, 22B...Flange, 22C...
Protrusion, 23A, 23B...contact, 24...resistance element, 24A...core, 24B...caulking member,
24C... terminal, 25... conductive terminal, 26... push spring, 27... pinion.

Claims (1)

[Claims for Utility Model Registration] In a cell starter device for an engine for a portable work machine configured to start by meshing a pinion of the starter motor with a ring gear provided on a flywheel, a starter motor having a pinion on its output shaft; An engine for a portable working machine, comprising a motor drive circuit whose power supply increases in proportion to the pushing stroke of the starter motor in the axial direction, and configured so that the pinion speed is increased by pushing the starter motor. cell starter device.