JPH0144755Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a governor device for a diesel engine, and particularly in a governor device in which a rack pin for adjusting the amount of fuel injection is operated via a link mechanism.
It is possible to eliminate play between the lever member and the connecting member that make up the link mechanism and between the connecting member and the rack pin, improving governor performance, and making it possible to operate only the rack pin by separating it from the link mechanism. This made it possible to stop the diesel engine.

[Conventional technical background and its problems]

As is well known, a governor device, which is a speed control device for a diesel engine, is installed in the fuel injection pump to keep the rotation speed of the diesel engine constant, prevent overspeed, and prevent the engine from stopping during overload operation. It's on. Figure 1 shows its general structure, where 1 is a fuel injection pump driven by the rotation of a camshaft 2 connected to the crankshaft of a diesel engine, and 3 is a plunger etc. to adjust the amount of fuel injection. This is a rack pin protruding from the side wall of the pump body for rotating the pump. This rack pin 3
is movable within a certain range in the horizontal direction,
In the illustrated example, it is located at the fuel injection amount upper limit position.
One end of a connecting member 4 is pivotally supported on this rack pin 3, and the other end of the connecting member 4 is pivotally supported on an action point portion 5a of a lever member 5. A spring 6 is hooked to the power point side of the lever member 5 for biasing the rack pin 3 in the direction A to increase the fuel injection amount, and a centrifugal weight (not shown) connected to the camshaft 2 is used to control the diesel engine. A force (governor force) F proportional to the rotational speed is applied to the force point portion 5 of the lever member 5.
b to balance the spring force 6 mentioned above. Therefore, when the rotational speed of the diesel engine increases and the governor force F overcomes the spring force, the rack pin 3 is pushed and moved via the lever member 5 and the connecting member 4 to reduce the fuel injection amount.

However, in the case of conventional governor devices,
Since it was a simple link mechanism, there were no gaps between the lever member 5 and the connecting member 4, and between the connecting member 4 and the rack pin 3.
There is play or backlash between the lever member 5 and the rack pin 3, which reduces the responsiveness between the lever member 5 and the rack pin 3, resulting in a decrease in governor performance. Also, the rack pin 3 is connected to the connecting member 4 and the lever member 5.
Since the rack pin 3 is restrained by the spring 6 via the spring 6, in order to directly move the rack pin 3 in the direction B that decreases the fuel injection amount, a large force is required to resist the spring force. Direction B
It was difficult to stop the diesel engine. For this reason, conventionally the engine was stopped by forcibly opening the intake valve or exhaust valve with a decompression lever, but with this method, the fuel injection pump works to supply fuel until the engine completely stops. Therefore, it had the disadvantage of causing fuel loss.

As a related technology, "Accelerator device for diesel engine" (Japanese Utility Model Application Publication No. 113921/1983)
is proposed. [Purpose of the invention] The present invention was made to solve the various problems mentioned above.The purpose of this invention is to improve the performance of the governor, and also to make it possible to stop the diesel engine by operating the rack pin, thereby reducing fuel loss. To provide a diesel engine governor device that can prevent

In order to achieve the above object, the present invention has a rack pin that increases or decreases the injection amount of the fuel injection pump.
A connecting member whose other end is pivotally supported via a pivot shaft at the point of action of the lever member that transmits the governor force; a sliding hole with a matching long hole; a tension spring that is stretched around the pin and the pivot shaft and presses the pin to the upper limit position side end of the hole; This configuration constitutes a governor device for a diesel engine, which is equipped with an operation lever for moving.

The governor force is transmitted to the rack pin via the lever member and the connecting member, but since a tension spring is stretched between the rack pin and the pivot shaft and the rack pin is pressed against the upper limit position side end of the slide hole, the governor force is transmitted to the rack pin via the lever member and the connecting member. is effectively transmitted to the rack pin, improving governor performance. Moreover, the tension spring prevents rattling of each pivot part.

In particular, only the rack pin can be easily moved to the lower limit position of the slide hole using the operating lever against the spring force, making it possible to easily stop the diesel engine. In addition, the structure is simple, just by forming a long slide hole in the connecting member and passing a tension spring between the rack pin and the pivot shaft.
Easy to manufacture and low cost.

[Example of idea]

A preferred embodiment of the present invention will be described below in detail with reference to the drawings.

In FIG. 2, in which the same reference parts are given to the same parts as those described above, 7 is a pivot shaft for pivoting one end of the connecting member 4 to the action point 5a of the lever member 5, and the lever member It is fixed on the 5th side.
An elongated slide hole 8 is formed at the other end of the connecting member 4 so that the rack pin 3 can be moved from its fuel injection amount upper limit position U to its lower limit position R in its non-operating position. A rack pin 3 is slidably engaged therein. A tension spring 9 is stretched between the rack pin 3 and the pivot shaft 7. The spring force of this tension spring 9 is much smaller than that of the biasing spring 6 of the lever member 5, and is set larger than the sliding resistance of the rack pin 3, so that only the rack pin 3 is moved into the slide hole 8 with a minute force. The rack pin 3 can be moved in the direction of decreasing the fuel injection amount along the direction A, and the rack pin 3 can be returned naturally to the direction A of increasing the fuel injection amount. On the other hand, a rack pin operating lever 1 is provided near the rack pin 3 of the fuel injection pump 1 for engaging the rack pin 3 and moving it in the direction of decreasing the fuel injection amount as shown in FIG.
0 is pivotally supported via a shaft 11. The rack pin operating lever 10 is adapted to be remotely operated via a link or wire (not shown).

According to the above configuration, the rack pin 3 and the pivot shaft 7
and are restrained by the spring force of the tension spring 9,
Even if there is a gap between each pivot, it is possible to prevent rattling. Since the rack pin 3 is biased and engaged by the tension spring 9 with the end of the slide hole 8 of the connecting member 4 on the side of the lever member 5, the lever force F can be transmitted effectively. This improves the responsiveness between the lever member 5 and the rack pin 3, and improves the governor performance.

Furthermore, since the rack pin 3 is freely movable within the range of the slide hole 8, only the rack pin 3 can be moved in the fuel injection amount decreasing direction B without moving the lever member 5, and the force at this time is the tension spring. 9
Since the force required to overcome the spring force is sufficient, operation using the rack pin operating lever 10 is extremely easy. Therefore, the diesel engine can be stopped by operating the rack pin 3. In this case, the diesel engine is stopped by reducing or stopping the fuel on the fuel injection pump 1 side, thereby preventing fuel loss.

[Effect of idea]

In summary, the present invention provides the following excellent effects.

(1) The spring force of the tension spring can eliminate looseness between the lever member and the connecting member and between the connecting member and the rack pin, thereby improving the governor performance.

(2) Since only the rack pin can be moved extremely easily in the direction of decreasing the fuel injection amount by the slide hole formed in the connecting member, it is possible to stop the diesel engine by operating the rack pin.

(3) Therefore, since the diesel engine is stopped on the fuel injection pump side, fuel loss can be prevented.

[Brief explanation of the drawing]

FIG. 1 is a front view showing a conventional governor device, FIG. 2 is a front view showing an embodiment of the present invention, and FIG. 3 is an explanatory view of the operation of a rack pin. In the figure, 1 is a fuel injection pump, 3 is a rack pin,
4 is a connecting member, 5 is a lever member, 6 is a spring, 7 is a pivot shaft, 8 is a slide hole, and 9 is a tension spring.

Claims (1)

[Scope of utility model registration request] A connecting member having one end connected to a rack pin that increases or decreases the injection amount of the fuel injection pump and the other end being pivotally supported via a pivot shaft to the point of action of a lever member that transmits a governor force, and a connecting member formed in the longitudinal direction of the connecting member. an elongated slide hole that engages the pin in a movable manner from the injection amount upper limit position to the lower limit position; a tension spring that is stretched between the pin and the pivot shaft and presses the pin against the upper limit position side end of the hole; A governor device for a diesel engine, comprising an operating lever that moves only the pin to a lower limit position against the spring force.