JPS6212841Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a frequency switching device for an engine generator.

Conventionally, this type of device has been designed to swing the engine governor lever between a low speed side and a high speed side by switching the operating knob, thereby freely switching the engine speed between a relatively low speed for 50 Hz and a relatively high speed for 60 Hz. However, in this case, the frequency obtained varies more or less depending on the magnitude of the electrical load, so it is desirable to be able to finely adjust the engine speed.

The purpose of the present invention is to provide a device with good operability that satisfies such demands. rotation speed
In a frequency switching device for an engine generator that can freely switch between a relatively low speed for 50 Hz and a relatively high speed for 60 Hz, the interlocking mechanism 2 is attached to a bracket 8 that pivotally supports the governor lever 1, and is perpendicular to the lever 1. A locking pin 6 and a locking pin 6 are screwed onto the operating shaft 4 and attached to the lever 1. The operating knob 3 is resiliently engaged with the operating shaft 4 by the spring 11 to prevent it from coming off, and the operating knob 3 is connected to the operating shaft 4 through a locking hole 7. 3 are engaged with each other in two steps in the axial direction via the inclined cam surface 13, and furthermore, the rotary operation portion 4a of the operation shaft 4 is made to face the opening at one end of the operation knob 3.

The interlocking mechanism 2 is attached to the upper side of the generator main body 9 as shown in FIG. 1 by a bracket 8, and the bracket 8 is bent into a substantially U-shape as shown in FIGS. 2 and 3. As shown in FIG.
is pivotally supported at one end so that it can swing freely in the front and back direction, and when it swings rearward, the engine speed is reduced by a known governor mechanism connected to a governor spring 10 at the other end, and conversely, it moves forward. According to the oscillation, the engine speed is increased.

The operating shaft 4 described above is slidably and rotatably inserted through the bent pieces 8b and 8c on both the front and rear sides of the bracket 8, and a cylindrical operating knob 3 is rotatably attached to the front end of the operating shaft 4. At the same time, the operating shaft 4 is attached to the back of the front bending piece 8b.
a spring 11 that urges the operation knob 3 rearward together with the operating knob 3;
and an inclined cam surface 13 in the front and back direction that receives the ball 12 provided on the rear end surface of the operating knob 3 on its front surface, and if the operating knob 3 is switched from the 50 Hz position shown in the figure to the clockwise 60 Hz position, The cam surface 13
This causes the operating knob 3 to move with the operating shaft 4 to the spring 1.
1, and is connected to the governor lever 1 via the aforementioned connector 5 screwed to the operating shaft 4.
A swing is given from the 50 Hz position to the forward 60 Hz position, and in this case, when the lever 1 is at the 50 Hz position, the engine rotation speed is relatively low, for example, 3000 rpm.
Also, at the 60Hz position, it is set to a relatively high speed, for example, 3600 rpm.

The operation shaft 4 is equipped with a rotation operation part consisting of a driver groove 4a for rotation operation at its front end, and according to the rotation operation clockwise and counterclockwise in the drawing, the connection The lever 5 is screwed forward and backward, respectively, and the lever 1 is given back and forth rocking at each of the frequency positions described above, so that the engine speed can be finely adjusted.

In this case, if the connector 5 is allowed to spiral forward in a wide range, overvoltage may occur due to an excessive increase in the engine speed, so it is necessary to limit the maximum engine speed that can be finely adjusted. A stopper means 14 is provided for regulating the stroke of the screwing forward and backward movement of the connector 5.

The stopper means 14 may be constructed by providing a stopper on the operating shaft 4 with which the connector 5 comes into contact; The range of rotation of the operating shaft 4 is limited by contact with the stopper piece 14b on the side of the bracket 8, and the screwing forward and backward movement of the connector 5 is restricted to a stroke corresponding to the range of rotation.

In the illustrated example, an arm 1a is attached to the lever 1 and is coaxially supported with the arm 1a, and a pin 6 protruding from the connector 5 is inserted through an elongated hole 7' formed in the lever 1 in the longitudinal direction. When the connector 5 is engaged with a vertically elongated hole 7 formed in the arm 1a, the lever 1 is caused to swing forward via the arm 1a and the adjustment screw 1b provided therein. The displacement of the lever 1 relative to the displacement of the connector 5 can be freely adjusted by the adjustment screw 1b.

In the drawing, 15 indicates a limit switch type changeover switch attached to the bracket 8, and the switch 1
5 is adapted to be switched in conjunction with the switching operation by a cam 16 attached to the aforementioned operating knob 3, and the switching operation causes the electric circuit to be switched between 50Hz and 60Hz as shown in Figure 4. Made it possible to switch. In the drawing, 17 indicates a generator coil, and 18 indicates an outlet.

Next, to explain its operation, according to the switching operation of the operating knob 3, the operating shaft 4 is moved back and forth in the front and rear directions as described above, and accordingly, the governor lever 1 is moved to the front 60
Hz position and the rear 50Hz position, and the engine speed can be switched between a relatively high speed for 60Hz and a relatively low speed for 50Hz.In this case, the frequency obtained may vary depending on the size of the electrical load. However, according to the present invention, when the operating shaft 4 is rotated, the connector 5 that is screwed thereto is screwed back and forth in the front and rear directions, and the accompanying rocking adjustment of the lever 1 changes the engine rotation. The number is finely adjusted to correct the frequency.

In this way, according to the present invention, the interlocking mechanism 2 that connects the governor lever 1 and the operation knob 3 is attached to the bracket 8 that pivotally supports the governor lever 1.
an operating shaft 4 which is slidably and rotatably inserted perpendicularly to the operating shaft 4 and is resiliently biased in one direction in the sliding direction by a spring 11;
and a connector 5 that is screwed onto the operating shaft 4 and engaged with the lever 1 through a locking pin and a locking hole 7, and the operating knob 3 is connected to the operating shaft 4 by the spring. 11 to prevent slippage, and the operating shaft 4 and the operating knob 3 are engaged in two steps in the axial direction via the inclined cam surface 13, so that the governor lever 1 is rotated. The operation knob 3, which rotates in two stages, can be easily installed, and since the rotary operation portion 4a of the operation shaft 4 is exposed to the opening at one end of the operation knob 3, it is easy to install the operation knob 3, which rotates in two stages. This has the advantage that the fine adjustment can be easily made without removing the operation knob 3.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of an example of an engine generator equipped with the proposed device, Fig. 2 is a perspective view of an example of the proposed device, Fig. 3 is a cutaway plan view thereof, and Fig. 4 is an electric circuit diagram. It is. DESCRIPTION OF SYMBOLS 1... Governor lever, 2... Interlocking mechanism, 3... Operating knob, 4... Operating shaft, 5... Connector, 6... Pin, 7... Hole, 14... Stopper means.

Claims (1)

[Claims for Utility Model Registration] 1. The engine speed can be changed between a relatively low speed for 50 Hz and a relatively high speed for 60 Hz by switching an operation knob 3 connected to a governor lever 1 of the engine via an interlocking mechanism 2. In a frequency switching device for an engine generator that can be switched in stages, the interlocking mechanism 2 is fitted into a bracket 8 that pivotally supports the governor lever 1 so as to be slidable and rotatable orthogonal to the lever 1. An operating shaft 4 that is resiliently moved in one direction of movement by a spring 11, and a connector that is screwed onto the operating shaft 4 and engaged with the lever 1 through a locking pin 6 and a locking hole 7. 5, and the operating shaft 4
The operating knob 3 is resiliently engaged with the spring 11 to prevent it from coming off, and the operating shaft 4 and the operating knob 3 are engaged in two steps in the axial direction via the inclined cam surface 13. Rotation operation part 4a of shaft 4
A frequency switching device for an engine generator, characterized in that the operating knob 3 faces an opening at one end thereof. 2. The frequency switching device for an engine generator according to claim 1, wherein the interlocking mechanism 2 includes a stopper means 14 for regulating the forward and backward stroke of the connector 5.