JPH036864Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of 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 idea aims to solve]

On the other hand, the electric motor that is a component of a starter is mainly a DC motor with high starting torque, and the starter must necessarily be equipped with a storage battery, which increases the weight of the entire working device that is driven by an internal combustion engine. becomes large, 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 electric motor and 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. , consisting of a cylindrical body part and a bottom edge part, made of a flexible elastic material, with a coaxial protrusion in the cylindrical body part, an annular protrusion in the bottom edge part, and a substantially convex vertical cross-sectional shape. A cap is provided, and the cap is arranged above the switch, the protrusion faces the switch knob, the cylindrical body portion passes through the lid of the switch box, and the annular protrusion is in close contact with the back surface of the lid of the switch box. It is.

[Embodiment] FIG. 1 is a vertical cross-sectional view of essential parts showing 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 designates a yoke, which is formed into a hollow cylindrical shape from a ferromagnetic material, and has a permanent magnet 4 formed in the shape of an arc segment fixed to its inner peripheral surface, and a bearing 5 at the closed end.
will be established. Next, 6 is a rotor, which is rotatably engaged with the bearings 2 and 5 via a shaft 7. That is, the center bracket 1, yoke 3 and 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, which house a plug 33, a rectifier 34, and a switch 35, respectively, and connect the respective devices and the electrical cord 18 as shown by the chain lines. Connect electrically. Next, reference numeral 36 denotes a cap, which is made of rubber or other flexible material and is formed into a substantially convex vertical cross-sectional shape, as shown in an enlarged vertical cross-sectional view in FIG. That is, in the figure, the cylindrical body part 37 and the bottom edge part 38 are made continuous, and a protrusion 39 is coaxially formed in the cylindrical body part 37, and an annular protrusion 40 is integrally protruded on the upper surface of the bottom edge part 38. Set up As shown in FIGS. 2 and 3, the cap 36 is placed above the switch 35 with the protrusion 39 facing the knob 41 of the switch 35, and the cylindrical body 37 passes through the lid 32 and forms an annular protrusion. 40 is placed in close contact with the back surface of the lid 32. Switch box 31 and lid 3
2 are combined, the switch 35 is clamped and fixed between the support 42 protruding from the switch box 31 and the bottom edge 38 of the cap 36.

FIG. 6 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. 6 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 into engagement with a starter gear (not shown) connected to the crankshaft of the internal combustion engine and transmits rotation. 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. Disengage the starting gear of the internal combustion engine. Therefore, the starter stops after a certain period of inertia operation continues. 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 switch for starting the starter is housed in a sealed state inside the switch box, and the switch components do not protrude, which not only prevents damage from unexpected external forces, but also protects against external environment such as rainwater. Extremely high resistance to

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view of the main parts of the starter according to the embodiment of the present invention, and FIGS. 2 to 5 are front views showing the switchbox, longitudinal cross-sectional views of the main parts, and front views showing the internal arrangement, respectively. FIG. 6 is an enlarged vertical sectional view showing the same cap, and FIG. 6 is an electric circuit diagram thereof. 4... Permanent magnet, 6... Rotor, 8... Commutator, 14, 15, 17... Gear, 18... Electrical cord, 31... Switchbox, 33... Plug, 34... Rectifier, 35 ...Switch, 36...
... Cap, 37 ... Cylindrical body part, 38 ... Bottom edge part,
39...Protrusion, 40...Annular protrusion.

Claims (1)

[Scope of utility model registration request] In a work device that is equipped with a DC motor that rectifies and applies a 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 that 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. A cap made of a flexible elastic material, consisting of a body part and a bottom edge part, a coaxial protrusion in the cylindrical body part, an annular protrusion in the bottom edge part, and a substantially convex longitudinal cross-sectional shape. characterized in that the cap is arranged above the switch, the protrusion faces the switch knob, the cylindrical body portion passes through the lid of the switchbox, and the annular protrusion is in close contact with the back surface of the lid of the switchbox. A work device whose driving source is an internal combustion engine.