JPH0528356Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention relates to an engine control device, and particularly to an engine driving a motor, which is equipped with a switching device for switching the output frequency of the generator. .

Conventional technology In a generator-driving engine, the maximum rotational speed of the engine is set to 3000 rpm for 50Hz and 3600 rpm for 60Hz so that the output frequency of the generator can be changed between 50Hz and 60Hz. A device is provided for reciprocally switching the rotation.

Conventionally, this type of frequency switching device has been designed to change the frequency of a stopper that regulates the maximum rotational position of a regulator lever for adjusting engine speed, as described in, for example, Japanese Patent Application Laid-open No. 135943/1983. By changing the rotating position of the frequency switching lever, the regulator lever is held at, for example, a 3600 rotation position for 60 Hz and a 3000 rotation position for 50 Hz.

However, in such a structure, first, the maximum rotational position of the regulator lever is changed, so the rotational operation range of the regulator lever differs between 60Hz and 50Hz. The drawback is that it is difficult to operate.

Moreover, since it receives the rotational operation of the regulator lever and regulates its maximum rotational position, the frequency switching lever also needs to be securely fixed.Therefore, in the past, the frequency switching lever Since the switch is fixedly held at a predetermined switching position with a bolt or the like, there is a drawback that the bolt must be loosened for switching. In particular, for dual-power work machines for road construction,
There may be frequent switching between 50Hz and 60Hz.
In that case, the operation of loosening the bolts becomes extremely troublesome.

In addition, in a device that switches the frequency by changing the maximum rotational position of the regulator lever, for example, even if the speed fluctuation rate is set within the required 5% at 3600 rotations. , the speed fluctuation range at that time is 180 rpm
Since the speed remains at 180 rpm even at 3000 rotations, the rate of speed fluctuation increases accordingly at 3000 rotations, and there is a disadvantage that it cannot be controlled within a predetermined range. That is, the engine speed is adjusted by the regulator lever by changing the spring load of the regulator spring by rotating the regulator lever, and by changing the spring load of the regulator spring and the fly weight on the fuel adjustment device side. A predetermined engine speed is set by balancing the centrifugal load, but the spring load
While it changes linearly between 3000 and 3600 rotations, the centrifugal load on the flyweight changes in proportion to the square of the rotation speed, so it can maintain appropriate speed fluctuations at both rotation speeds. It was difficult to keep it within the range.

Therefore, in order to solve this speed fluctuation rate problem, as described in Japanese Utility Model Publication No. 59-22264, it was decided to change the mounting position of the regulator spring to the regulator lever. Therefore, by changing the lever length of the regulator spring connecting part between 3000 rpm and 3600 rpm, the speed fluctuation rate can be kept within a certain range regardless of whether the speed is 3000 rpm or 3600 rpm. A device has been devised that allows the regulator lever to have the same rotation angle.

Problems to be Solved by the Invention However, even with the technology disclosed in Japanese Utility Model Publication No. 59-22264, the mounting position of the spring connected to the regulator lever must be changed between 50Hz and 60Hz. . To do this, it is necessary to remove and replace the regulator spring, which requires stopping the engine each time, which is cumbersome to operate on machines that frequently change the frequency, such as some of the above-mentioned work machines. It has the disadvantage of being

Further, there is a device disclosed in Japanese Utility Model Application Publication No. 1-119847 that attempts to eliminate the above-mentioned troublesome operations.

This is achieved by providing another adjustment lever for the governor lever, and further providing a governor difference correction operating tool separately from this governor lever, and connecting the aforementioned governor difference correction operating tool to this governor lever via a governor difference auxiliary spring. By configuring the governor difference correction operating tool so that it can be switched between the correction position and the correction release position, it is possible to easily switch between the power generation state at the lower commercial frequency and the power generation state at the higher commercial frequency. It is designed so that it can be switched with .

However, even in the above system, the adjustment lever and the governor difference correction operating tool are arranged in completely different positions and orientations, so the adjustment lever and the governor difference correction operating tool must be operated separately. ,
The drawback was that this operation was troublesome.

This invention was made for the purpose of eliminating such conventional drawbacks.

Means for Solving the Problems In order to achieve the above object, this invention uses a regulator lever 3 that adjusts the engine speed and a governor lever 12 that is interlocked and connected to the fuel adjustment section of the engine. The regulator spring 13 is connected by a regulator spring 13, and the regulator spring 13 is connected by rotating the regulator lever 3.
In the control device for changing the spring load on the governor lever 12, the regulator lever 3 and the frequency switching operation tool 4 are coaxially supported, and each operation part is close to each other facing in the same direction. The tip of a stopper screw 18 screwed into this frequency switching operating tool 4 is in contact with the regulator lever 3, and the operating portion of this frequency switching operating tool 4 and the regulator lever 3 are in contact with each other. The governor lever 12 and the frequency switching operation tool 4 are arranged in close proximity to each other in a position where they can be operated simultaneously. Only in this case, the governor lever 12 is connected by an auxiliary spring 16 on which a load acts.

Function In the configuration of this invention described above, the maximum rotational position of the regulator lever 3 is, for example, 50Hz, which is a low frequency.
It is set on the side. Therefore, when this regulator lever 3 is rotated to its maximum rotation position,
The output frequency of the generator driven by the engine will automatically be 50Hz. In this state, when the frequency switching operation tool 4 is switched to one switching position and the load of the auxiliary spring 16 is applied to the governor lever 12 side, both the spring load and the spring constant are switched, and this position is set to 60Hz. You can set it to .

Furthermore, since the regulator lever 3 and the frequency switching operating tool 4 are coaxially supported and each operating part is arranged close to each other, the regulator lever 3 and the frequency switching operating tool 4 are It is possible to operate both at the same time.

Embodiment In FIGS. 1 and 2 showing an embodiment of this invention, 1 is a lever shaft attached to the side surface of the engine body 2, and the lever shaft 1 has a regulator lever 3, a regulator lever 3, A frequency switching lever 4 and a lever stand 5 are attached so as to be relatively rotatable. The lever stand 5 is fixed to the engine body 2 with bolts 6 as shown in FIG. Friction plates 6, 6 are interposed between the regulator lever 3 and the frequency switching lever 4 and on the back side of the regulator lever 3, and a spring presser 7 and a lever base 5 are fitted onto the lever shaft 1. The regulator lever 3 and the frequency switching lever 4 are brought into pressure contact with these friction plates 6, 6 by the presser spring 8 provided between them.
And the regulator lever 3 can be held at any rotational position. On the outside of the spring holder 7, a nut 9 is screwed into a bolt portion formed at the tip of the lever shaft 1 to hold the lever holder 7. Note that the frequency switching lever 4 and the regulator lever 3 protrude outward and upward from an opening 10 formed in the lever base 5, and their respective operation parts are arranged close to each other. Similarly, a stopper screw 11 for regulating the maximum rotational position of the regulator lever 3 is attached to the lever base 5. When the regulator lever 3 is rotated to the right in FIG. A regulator lever 3 comes into contact with the tip and is regulated to its highest rotational position. The maximum rotation speed in this case is 3000 rotations for 50Hz. 12
is the engine body 2 below the lever stand 5.
One end of the governor lever 12 and the tip of the regulator lever 3 are connected by a regulator stopper 13. That is, regulator lever 3
When the regulator spring 13 is rotated until it contacts the stopper screw 11, the regulator spring 13 is pulled, the spring load acting on the governor lever 12 is increased, and the engine speed is adjusted to the above-mentioned 3000 rpm. It is something. 14 is the governor lever 12
and the regulator lever 3.

Next, an elongated hole 15 is formed at one end of the frequency switching lever 4 and is curved along the direction of rotation of the frequency switching lever 4.
The other end of the auxiliary spring 16 connected to the elongated hole 15 is movably connected to the elongated hole 15. A stopper screw 18 whose tip abuts against the regulator lever 3 is screwed into the other end of the frequency switching lever 4 at a bent portion 17 bent at right angles to the rotation direction. The frequency switching lever 4 is stopped at the position where the stopper screw 18 comes into contact with the regulator lever 3. FIG. 1 shows the case where the frequency switching lever 4 is rotated in this manner. In this state, the auxiliary spring 16 is pulled by the end of the elongated hole 15 and is pushed toward the governor lever 12. A state in which the load of the auxiliary spring 16 is applied is shown.

That is, in this state, in addition to the load of the regulator spring 13, the load of the auxiliary spring 16 is also applied to the governor lever 12 side, and as a result, the engine speed is maintained at 3600 rpm due to this increase in load. ing. From this state, as shown in FIG.
When rotated to the left in the figure, the governor lever 12
The load on the auxiliary spring 16 that had been acting on the auxiliary spring 16 is completely released, and one end of the auxiliary spring 16 moves within the elongated hole 15 and is placed in a completely free state. As a result, the only load acting on the governor lever 12 is the regulator spring 13, and the engine speed is maintained at the aforementioned 3000 rotations. Also, since the number of springs acting on the governor lever 12 is only one, the spring constant at this time will be different from that at 3600 rotations when there are two springs, and the spring constant at that time will be changed to the speed fluctuation rate of 5. All you have to do is set it so that it stays within %. In addition,
Reference numeral 19 in the figure indicates a fuel limiting stopper for regulating the maximum rotational position of the governor lever 12 and limiting the maximum injection charge.

Further, when the regulator lever 3 is rotated from the state shown in FIG. 3 to the position of the stopper screw 19 of the frequency switching lever 4, the engine is maintained at the idle speed.

Effects of the invention According to this invention, unlike the conventional method in which the position of the maximum rotation stopper is changed by operating the frequency switching lever, the total spring load acting on the governor lever side is changed by using the frequency switching operation tool. Therefore, as shown in the embodiments, it is only necessary to hold the frequency switching operating tool with a friction plate or the like, and there is no need to firmly fix it with bolts or the like, so the switching operation is very easy. In addition, in this device, the load of the auxiliary spring acts on the governor lever side at one switching position of the switching operation tool, but it does not act in the same way at the other switching position, so that only the spring load acting on the governor lever side However, as the number of springs changes, the spring constant changes, and by setting each spring constant to an appropriate value, it is possible to keep the speed fluctuation rate within a predetermined range in any case. There is an effect that makes it possible. Moreover, in this case, there is no need to replace the spring as in the conventional case, so it is extremely easy to operate, making it ideal for work machines that require frequent frequency switching. .

In addition, since the regulator lever and the frequency switching operation tool are coaxially supported and each operation part is arranged close to each other, the regulator lever and the frequency switching operation tool can be operated at the same time. This makes it very easy to operate. Furthermore, the tip of the stopper screw screwed into the frequency switching operation tool is in contact with the regulator lever, so when stopping engine drive, the frequency can be changed by operating only the regulator lever to the stop position. Since the switching tool is also moved at the same time by the stopper screw, there is no need to operate the frequency switching tool, making the operation easier.
Furthermore, since it does not use something like an electric actuator, it can be installed compactly and at low cost.

[Brief explanation of the drawing]

Fig. 1 is a front view of the entire device showing an embodiment of this invention, Fig. 2 is a longitudinal sectional view of the main part of Fig. 1, and Fig. 3
The figure is a front view of the entire device, showing a state in which only the frequency switching lever has been rotated from the state shown in FIG. 3... Regulator lever, 4... Frequency switching lever, 12... Governor lever, 13... Regulator spring, 16... Auxiliary spring, 1
8... Stopper screw.

Claims (1)

[Scope of utility model registration request] A regulator lever that adjusts the rotational speed of the engine and a governor lever that is interlocked and connected to a fuel adjustment section of the engine are connected by a regulator spring, and the regulator lever is rotated by rotating the regulator lever. In an operating device that changes the spring load applied to a governor lever by a spring, the regulator lever and the frequency switching operating tool are coaxially supported, and each operating part is provided close to each other facing the same direction. and the tip of a stopper screw screwed into this frequency switching operating tool is in contact with the regulator lever, so that the operating part of this frequency switching operating tool and the operating part of the regulator lever can be operated simultaneously. the regulator lever and the frequency switching operating tool are arranged in close proximity to each other in a position where the switching operating tool is in only one of the two switching positions of the switching operating tool;
An engine control device characterized in that the regulator lever is connected by an auxiliary spring that applies a load.