JPH036863Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to work equipment that uses an internal combustion engine as a drive source, such as a lawn mower or snow blower for home use, and is particularly applicable to work equipment that uses a commercial AC power source. The present invention relates to a working device in which an internal combustion engine is started by a DC motor.

[Conventional technology]

In general, work equipment such as lawn mowers and snow blowers are powered by internal combustion engines or electric motors, but the former is easier to operate and has a wider range of work, so it is relatively widely used. . However, since internal combustion engines do not have self-starting properties, they must be started using human power or an electric motor. In other words, those equipped with a starter have become mainstream.

[Problem that the invention attempts to solve]

On the other hand, the main component of the starter is a DC motor with high starting torque, and the starter must necessarily be equipped with a storage battery.
The weight of the entire working device using an internal combustion engine as a driving source increases, significantly reducing work efficiency. Furthermore, since the above-mentioned working equipment is not necessarily used all the time, there is a problem in that the maintenance and management of the storage battery is complicated, and this also causes a situation in which it is not possible to immediately respond to an emergency situation such as when it snows. In order to solve the above problems, there have been attempts to start an internal combustion engine by driving an AC induction motor with a commercial AC power supply, but the AC induction motor cannot satisfy this requirement because its starting torque is small. Since a normal starter motor has a DC specification of 12 to 20 V, even if commercial AC is converted to DC at the same voltage, it cannot be applied to the motor. Further, even if the voltage is stepped down and rectified through a transformer, there are disadvantages in that the loss caused by the transformer is large and a large starting current cannot be obtained. For this reason, it became necessary to develop a starter motor that can be used with commercial alternating current converted to direct current at the same voltage.

The present invention solves the above-mentioned problems and provides a working device using an internal combustion engine as a drive source, which can be easily started using a household commercial AC power source, and has good operability and workability. The purpose is to provide the following.

[Means for solving problems]

In order to solve the above problems, the present invention adopts the following technical means. That is, in a work device that is equipped with a DC motor that rectifies and applies current from a commercial AC power source and is driven by an internal combustion engine that is equipped with a starter for an internal combustion engine that includes the DC motor, the commercial AC power source and the DC A switchbox is provided between the motor and the motor, which houses a plug for detachably connecting the commercial AC power supply, a rectifier for rectifying the current from the commercial AC power supply, and a switch for turning on/off the power supply to the DC motor, The switch box is provided with a support having a stepped portion on either the box or the lid to engage with a hole provided in the rectifier, and
The other side is provided with a protrusion that comes into contact with the rectifier, and is formed to sandwich the rectifier.

〔Example〕

FIG. 1 is a longitudinal cross-sectional view of a main part of a starter in an embodiment of the present invention. In the figure, 1 is a center bracket, and a bearing 2 is provided in the center.
Reference numeral 3 denotes a yoke, which is made of a ferromagnetic material and has a hollow cylindrical shape, and has a permanent magnet 4 formed in the shape of an arc segment fixed on its inner peripheral surface, and a bearing 5 at the closed end.
will be established. Next, a rotor 6 is rotatably engaged with the bearings 2 and 5 via a shaft 7. That is, the center bracket 1, the yoke 3 and the rotor 6
This forms a DC motor. Note that 8 is a commutator and 9 is a carbon brush. Then 1
0 is a gear housing, which engages with the center bracket 1 to support gears. That is, the center bracket 1 and the gear housing 10 are provided with bearings 11 and 12, respectively, to rotatably support the gear shaft 13. A gear 14 is provided on the gear shaft 13 and engages with a gear 15 provided on the shaft 7 of the rotor 6, and a clutch 16 and a gear 17 are provided rotatably and slidably in the axial direction. It is disposed so as to be able to engage with a starting gear (none of which is shown) connected to the crankshaft of the engine. 18 is an electric cord, one end of which is connected to the carbon brush 9.
At the same time, the other end is connected to a switchbox, which will be described later.

Next, FIGS. 2 to 4 are a front view showing a switchbox in an embodiment of the present invention, a longitudinal sectional view of the same essential part, and a front view showing the internal arrangement, respectively. In these figures, reference numerals 31 and 32 are a switchbox and a lid, each of which houses a plug 33, a rectifier 34, and a switch 35, and connects the respective devices and the electrical cord 18 as shown by chain lines. Connect electrically. Next, 36 is a cap, which is made of rubber or other flexible material and has a substantially convex longitudinal section, as shown in FIG.
It is provided above the switch 35, facing the knob 41, and passing through the lid 32.

FIG. 5 is a vertical cross-sectional view of the main part showing the vicinity of the rectifier 34 in the switch box according to the embodiment of the present invention, and FIGS. 6 and 7 are respectively C in FIG.
-C and D-D arrow views, the same parts are the second
The same reference numerals as in FIGS. In these figures, reference numeral 47 denotes a column, which projects from the inner wall of the lid 32 and is provided with a stepped portion 49 to be engaged with a hole 48 provided in the rectifier 34. Next, reference numeral 50 denotes a protrusion, which protrudes from the inner wall of the switch box 31 and is arranged so that its tip comes into contact with the surface of the rectifier 34. When the switchbox 31 and the lid 32 are combined, the rectifier 34 is positioned and clamped and fixed at the same time by the struts 47 protruding from the lid 32 and the protrusions 50 protruding from the switchbox 31. In addition, as shown by the chain line in FIG. 5 and FIG.
If the barrier 47a is provided on the side surface of the switch box 31 and the lid 32, the barrier 47a will isolate the terminals 34a of the rectifier 34 from each other, ensuring insulation between the terminals. It is valid.

FIG. 8 is an electrical circuit diagram of the component equipment shown in FIGS. 1 to 4, and the same parts are designated by the same reference numerals as in the previous figures. In the same figure, B,
W indicates an AC terminal of the plug 33, and G indicates a ground terminal.

The operation of the above configuration will now be described.
First, a household commercial AC power source and terminals B and W of the plug 33 shown in FIG. 8 are electrically connected via a socket and a cord (none of which are shown). When the switch 35 is turned on, the alternating current from the commercial AC power source is converted to direct current by the rectifier 34 and is supplied to the starter including the direct current motor, so that the rotor 6 rotates as shown in FIG. . Next, the gear shaft 13 rotates via the gears 15 and 14, so
Clutch 16 slides gear 17 to the left to engage and transmit rotation to a starter gear (not shown) that connects the internal combustion engine to the crankshaft. After starting the internal combustion engine, if the pressure on the knob 41 shown in FIGS. 3 and 4 is released and the switch 35 is turned off,
Since the power supply is stopped, torque transmission by the rotor 6 is stopped. Since the gear 17 and clutch 16 shown in FIG. 1 are constantly pressed to the right by a spring (not shown), the stop of torque transmission causes the gear 17 to slide to the right. to disengage the internal combustion engine starting gear. Therefore, the starter stops after continuing a certain inertia operation. After the internal combustion engine starts as described above, an AC power source is no longer required, so connect the socket and cord to the plug 33.
It is then removed from the machine and used to perform tasks such as mowing lawns or removing snow, depending on the specific work function of the device.

[Effect of idea]

Since the present invention has the structure and operation as described above, it can produce the following effects.

(1) Although it is a work device that has a starter that consists of a DC motor, it can directly apply commercial AC power and can be started immediately to perform the specified work even in an emergency.

(2) There is no need for a storage battery for the starter, so
This not only saves the trouble of complicated maintenance and management, but also reduces the weight of the working device itself and improves its operability.

(3) The rectifier that rectifies the current from the commercial AC power source is completely sealed inside the switchbox, and is positioned and clamped within the switchbox by the struts and protrusions.
It has high environmental resistance against rainwater, etc., and at the same time, it has sufficient resistance and reliability to withstand vibrations that occur with the operation of working equipment.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view of the main parts of a starter according to an embodiment of the present invention, and FIGS. 2 to 4 are front views showing the switchbox, longitudinal cross-sectional views of the main parts, and front views showing the internal arrangement, respectively. , FIG. 5 is a vertical cross-sectional view of the main part near the rectifier in the same switch box, FIGS. 6 and 7 are views taken along the lines C-C and D-D in FIG. 5, respectively, and FIG. It is the same electric circuit diagram. 4... Permanent magnet, 6... Rotor, 8... Commutator, 14, 15, 17... Gear, 18... Electric cord, 31... Switchbox, 33... Plug, 34... Rectifier, 35 ...Switch, 47...
...Strut, 49...Stepped portion, 50...Protrusion.

Claims (1)

[Scope of utility model registration request] In a working device that is equipped with a DC motor that rectifies and applies current from a commercial AC power source, and is driven by an internal combustion engine that is equipped with a starter for an internal combustion engine that includes the DC motor, wherein the commercial AC power source and the DC motor are connected to each other. In between, a switch box is provided which houses a plug for detachably connecting the commercial AC power source, a rectifier for rectifying the current from the commercial AC power source, and a switch for turning on/off the power supply to the DC motor, The rectifier is sandwiched between the box and the lid by providing a strut having a stepped portion on either the box or the lid and having a stepped portion to engage with the hole provided in the rectifier, and on the other side a protrusion that comes into contact with the rectifier. A working device whose driving source is an internal combustion engine, characterized in that it is formed so as to.