JPH068283Y2 - Frequency generator for engine generator - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] In the present invention, the frequency is, for example, 50 Hz according to the region in which it is used.
And a frequency switching device for an engine generator that can be selectively switched to 60 Hz.

[Prior Art and Problems Thereof] Generally, the engine generator is provided with a frequency switching device for switching the frequency between 50 Hz and 60 Hz depending on the region where it is used.

In order to switch the frequency, it is necessary to change the engine speed and simultaneously switch the voltage circuit to prevent the voltage from varying due to the difference in frequency.

For example, Japanese Utility Model Laid-Open No. 58-108245 discloses a device in which the engine speed and the voltage circuit can be switched simultaneously by operating one operating lever (throttle lever).

That is, for example, when switching the frequency from 50 Hz to 60 Hz, the operation lever is rotated by the set angle. Then, the governor lever connected to this operating lever via the governor spring slightly opens the throttle valve, and the engine speed is increased from 3000 rpm to 3600 rpm. At the same time, the operating lever presses the switch operating portion of the voltage circuit changeover switch to change over the voltage circuit.

By the way, according to the frequency switching device shown in this prior art, since the switching postures of the operating lever in the two directions are each held by the biasing force of the governor spring, the operating lever and this operating lever are retained. If there is a backlash with the shaft supporting the, the operating lever will be tilted to the side by the biasing force of the governor spring. If the tilt angle of the operating lever becomes large, the voltage circuit changeover switch may not engage with the operating lever, and as a result, the rated voltage as the output voltage may not be obtained. If the rattling between the operating lever and the shaft that pivotally supports this operating lever is reduced to prevent tilting, the rotation of the operating lever during frequency switching will become heavy and the operability will deteriorate. There is a problem that the sense of moderation is poor.

[Purpose of the Invention] The present invention has been made in view of the above circumstances, and does not cause the operation lever to tilt, does not interfere with the switching operation of the voltage circuit changeover switch, and is reliably operated and rated. It is an object of the present invention to provide a frequency switching device for an engine generator, which can obtain a desired voltage and which is excellent in operability and moderation.

[Means for Solving Problems] A frequency switching device for an engine generator according to the present invention includes a speed control lever connected to a governor lever via a governor spring and an operation lever for switching a rotation angle of the speed control lever. A frequency switching device for an engine generator, which is pivotally supported by a control bracket, and in which a voltage circuit changeover switch is fixedly mounted, and a cam body for pressingly dissociating the switch operation part of the voltage circuit changeover switch is provided in the operation lever. At
The tip of the lever portion extending from the lever portion of the operation lever is formed by overhanging the guide surface formed on the control bracket and bent toward the back surface, and one side of the operation knob attached to the tip of the lever portion is attached to the tip of the lever portion. And a control bracket interposed between the control lever and the control bracket, and stopper surfaces for restricting the turning angle of the operation lever in two directions are formed at both ends of the guide surface to prevent contact between the operation lever and the stopper surfaces. A flip-flop spring to be held is hooked on the lever portion side facing the operation knob with the control bracket interposed therebetween.

[Operation] In the above configuration, one side of the operation knob attached to the operation lever is constantly pressed against the guide surface of the control bracket by the urging force of the flip-flop spring. The operation knob slides on the control bracket to prevent the operation lever from tilting. Therefore, the pressing posture of the voltage circuit changeover switch of the cam body provided on the operation lever with respect to the switch operating portion becomes constant.

[Embodiment of the Invention] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

1 is a front view of a frequency switching device when 50 Hz is used, FIG. 2 is a front view of the frequency switching device when 60 Hz is used, and FIG. 3 is III of FIG. -III sectional view, FIG. 4 is an enlarged front view of the main part of the frequency switching device, and FIG. 5 is a side view of the main part of the frequency switching device.

In these drawings, reference numeral 1 is a carburetor provided in the engine body, and a slotter shaft 1a of the carburetor 1 is fixedly provided with a throttle lever 1b. One end of the governor rod 2 is connected to the throttle lever 1b.

The other end of the governor rod 2 is connected to the tip of the governor lever 3, and the base of the governor lever 3 is fixed to the governor shaft 4 with bolts 5.

On the other hand, reference numeral 6 is a control bracket. The control bracket 6 is fixed to a boss 7a protruding from the engine body by bolts 7b. This control bracket 6 has a voltage circuit changeover switch 8
Is fixed, and a pin 11 is crimped to the front thereof. A speed control lever 9 and an operation lever 10 are rotatably supported by the pin 11 with a predetermined space therebetween and are retained by a snap ring 11a.

The voltage circuit changeover switch 8 is composed of a breaker circuit changeover switch 8a and a voltage regulator circuit changeover switch 8b, and movable switch operating units 8c and 8d are provided on the same surface of both switches 8a and 8b. Has been. By moving the switch operating units 8c and 8d back and forth, the switches 8a and 8b switch and connect the breaker circuit and the voltage regulator circuit according to the set frequency.

Further, the tip portion 9a of the speed control lever 9 is
Further, the other end of the governor spring 12 having one end hooked in the middle of the governor lever 3 is hooked. A stopper surface 9b is formed on the base of the speed control lever 9.

The adjusting screw 13a faces the counterclockwise direction of the stopper surface 9b. The adjusting screw 13a is screwed into the receiving portion 6a formed on the control bracket 6, and by the elastic force of the compression spring 14 interposed between the receiving portion 6a and the head 13b of the adjusting screw 13a. It is locked.

The adjusting screw 13a is for regulating the rotation angle of the speed control lever 9 in the counterclockwise direction and setting the engine speed to 3000 rpm at 50 Hz, for example.

A lever portion 10a is provided at one end of the operation lever 10. A tip 10b of the lever portion 10a is bent in a U shape by overhanging a guide surface 6b formed by cutting out one side of the control bracket 6, and a concave portion 10d of an operation knob 10c is attached thereto. There is.

A guide surface 6b of the character control bracket 6 and a step portion 10e slidably contacting a side edge portion 6c of the guide surface 6b are formed on one side of the operation knob 10c. Further, a knob portion 10f is integrally formed on the other side of the operation knob 10c. In addition, the guide surface 6 of the control bracket 6
Stopper surfaces 6d that are hooked on the stepped portion 10e of the operation knob 10c and restrict the rotation angle of the operation lever 10 are formed at both ends of b.

Further, a slit 10h is formed at the tip 10b of the operation lever 10 that is bent in a U-shape.
One end of the flip-flop spring 15 is hooked at 0h. Furthermore, this flip-flop spring 1
The other end of 5 traverses the pin 11 and is hooked on a V-shaped notch 6e formed at the other end of the control bracket 6.

Further, a bracket portion 10j is formed on the lower side surface of the lever portion 10a of the operation lever 10, and an adjusting screw 13c for pressing the stopper surface 9b of the speed control lever 9 in the clockwise direction is formed on the bracket portion 10j. It is screwed in.

The adjusting screw 13c is provided on the compression spring 1 interposed between the head 13d and the bracket 10j.
Locked by 4 This adjusting screw 13c changes the engine speed to 3 at 60 Hz, for example.
It is for setting to 600 rpm.

Further, a cutout portion 10g is formed at an end portion of the lever portion 10a of the operation lever 10 which faces the pin 11 and sandwiches the pin 11, and the cutout portion 10g is communicated with a shaft hole 10i inserted through the pin. ing. In addition, the cutout portion 10g
The projection 16a of the cam body 16 is attached to the. A plate portion 16b is integrally formed on an upper portion of the protrusion 16a of the cam body 16, and the plate portion 16b is interposed between the speed control lever 9 and the operation lever 10 and is rotated by the pin 11. It is pivotally supported.

Further, a step portion 16c that escapes the peripheral edge of the speed control lever 9 is formed in the lower portion of the plate portion 16b, and both sides of the step portion 16c hold the space between the speed control lever 9 and the operating lever 10 to speed control. The lever 9 is adapted to rotate loosely.

Further, the cam portion 1 is provided below the step portion 16c of the cam body 16.
6d is integrally formed. The cam portion 16d projects from the end surfaces of the operation lever 10 and the control bracket 6 in the vertical direction of FIG.
The cam lobe 16e of the breaker circuit changeover switch 8
a and a switch operating portion 8c and 8d provided on the voltage regulator circuit changeover switch 8b, respectively, are provided so as to be freely slidable against each other.

The engine body to which these components are attached is housed in a soundproof case 17. Further, the operation knob 10c of the operation lever 10 is projected from the window formed in the soundproof case 17 to the outside so that it can be operated from the outside.

Next, the operation of the frequency switching device having the above configuration will be described.

When the operation lever 10 is rotated in the counterclockwise direction in the drawing, the side surface of the operation knob 10c mounted on the operation lever 10 is locked by the stopper surface 6d formed on one side of the guide surface 6b of the control bracket 6. The rotation is restricted, and the flip-flop spring 15 having one end hooked on the lever portion 10a of the operation lever 10 presses the side surface of the operation knob 10c against the stopper surface 6d to fix the position.

When the engine is started in this state, the governor sleeve (not shown) causes the governor shaft 4 to move as the engine speed increases.
The governor shaft 4 by urging the
The governor lever 3 which is continuously installed in the same direction is rotated in the same direction.

Then, the governor spring 12 having one end hooked on the governor lever 3 is pulled, and the speed control lever 9 hooking the other end of the governor spring 12 pivots counterclockwise, so that the other speed control lever 9 is locked. The stopper surface 9b formed at the end is locked by the adjusting screw 13a that is screwed into the receiving portion 6a formed in the control bracket 6, and the rotation is restricted.

Then, when the engine speed further increases, the governor sleeve rotates the governor lever 3 counterclockwise against the biasing force of the governor spring 12, and the biasing forces of the governor sleeve and the governor spring 12 are balanced. The governor lever 3 stops at the open position. As a result, the engine speed becomes 3000 rpm when the opening degree of the throttle valve (not shown) connected to the governor lever 3 via the governor rod 2, the throttle lever 1b, and the throttle shaft 1a is 50 Hz. Is controlled (state of FIG. 1).

On the other hand, when switching the frequency to, for example, 60 Hz, the knob portion 10f of the operation knob 10c attached to the operation lever 10 is gripped, and the operation lever 10 is rotated clockwise about the pin 11. Then, the step portion 10e of the operation knob 10c connected to the operation lever 10 is slid along the guide surface 6b formed in the control bracket 6 by being cut out. And the operation knob 1
The side surface of 0c is hooked on a stopper surface 6d formed at the other end of the guide surface 6b to restrict the rotation of the operation lever 10, and this state is maintained by the biasing force of the flip-flop spring 15.

While the operation lever 10 is rotating, the operation lever 10
The adjusting screw 13c screwed to the bracket portion 10j of the above presses the stopper surface 9b of the speed control lever 9. The speed control lever 9 receives the pressing force of the adjusting screw 13c and rotates clockwise, and the tip portion 9 of the speed control lever 9 is rotated.
The governor spring 12 hooked on a is pulled.

As a result, the governor lever 3 rotates via the governor spring 12, and the governor lever 3 moves.
A throttle valve (not shown) fixedly attached to the throttle lever 1b of the carburetor 1 is slightly opened via the
The engine speed is set to 3600 rpm (state shown in FIG. 2).

By the way, the operation lever 10 tends to be tilted in the direction of the arrow in FIG. 3 by the biasing force of the flip-flop spring 15. However, since the step portion 10e of the operation knob 10c is pressed against the guide surface 6b of the control bracket 6 by the urging force of the operation lever 10 in the arrow direction, the operation knob 10c is not tilted, and therefore, Since the lever tip 10b of the operation lever 10 is mounted in the concave portion of the operation knob 10c, the operation lever 10 does not tilt and has good operability.

Further, since the operation lever 10 is hooked on the step portion 16c of the cam body 16, the operation lever 10 is not sandwiched between the speed control lever 9 and the control bracket 6, and the rotation of the speed control lever 9 is smooth.

Also, when the operation lever 10 is set to 60 Hz,
The cam body 16 that engages the protrusion 16a with the cutout portion 10g of the operation lever 10 follows the operation, and the cam lobe 16e formed in the cam portion 16d of the cam body 16 includes the breaker circuit changeover switch 8a and the voltage regulator circuit. Changeover switch 8
By pressing each switch operation part 8c, 8d of b, the breaker circuit and the voltage regulator circuit are switched, and thereby 60 Hz
Switch to the rated voltage at the time.

Since the protrusion 16a of the cam body 16 is engaged with the notch 10g of the operation lever 10 and rotated, the operation lever 10 is rotated as described above.
Even if it receives the urging force of 5, the cam body is not tilted, so that either one of the switch operating portions 8c and 8d does not malfunction.

Since the shaft hole 10i of the operation lever 10 is communicated with the cutout portion 10g, the operation lever 10 can be attached to the pin 11 from the side during assembly, which is good in workability. Also, the above flip-flop spring 1
Since the notch 6e for hooking one end of 5 is formed in a V shape on the end surface of the control bracket 6, the workability in hooking the flip-flop spring 15 is good.

Further, the frequency switching device according to the present invention is not limited to the above-described embodiment, and for example, the cam body may be restricted by the operation lever only in the rotation direction so as to be prevented from coming off.

[Advantage of the Invention] As described above, according to the present invention, since the operation lever is always pressed against and supported by the control bracket via the operation knob by the biasing force of the flip-flop spring, the operation lever tilts. Therefore, since the cam body is not tilted in the same direction, it does not hinder the switching operation of the voltage circuit changeover switch and can be reliably operated to obtain the rated voltage. Furthermore, since the rotation of the speed control lever is smooth during frequency switching, the engine speed stabilizes immediately after switching, and a prescribed frequency can always be obtained at the time of switching, and operability and moderation are good. That is an excellent effect.

[Brief description of drawings]

1 is a front view of a frequency switching device when 50 Hz is used, FIG. 2 is a front view of the frequency switching device when 60 Hz is used, and FIG. 3 is III of FIG. -III sectional view, FIG. 4 is an enlarged sectional view of an essential part of the frequency switching device, and FIG. 5 is a side view of an essential part of the frequency switching device. 3 ... Governor lever, 6 ... Control bracket, 6b
... guide surface, 6d ... stopper, 8 ... voltage circuit changeover switch, 8c, 8d ... switch operating part, 9 ... speed control lever, 10 ... operating lever, 10a ... lever part,
10b ... Lever tip, 10c ... Operation knob, 12 ... Governor spring, 15 ... Flip-flop spring,
10g ... notch part, 16 ... cam body, 16a ... convex part, 1
6e ... Cam lobe.

Claims (1)

[Scope of utility model registration request] 1. A speed control lever connected to a governor lever via a governor spring and an operation lever for switching a rotation angle of the speed control lever are pivotally supported on the control bracket, and a voltage circuit changeover switch is mounted on the control bracket. In a frequency switching device for an engine generator, wherein a cam main body is fixedly provided and presses and dissociates the switch operating portion of the voltage circuit changeover switch, the lever tip extending from the lever portion of the operating lever is set to the above. The guide surface formed on the control bracket is overhung and bent to the back side, and one side of the operation knob attached to the tip of the lever is interposed between the tip of the lever and the control bracket, and the operation lever is The stopper surface that regulates the rotation angle of the Characterized in that flip-flop springs formed at both ends of the operation surface and holding the contact state of the operation lever with respect to each of the stopper surfaces are hooked on the lever portion side facing the operation knob while sandwiching the control bracket. A frequency switching device for an engine generator.