JPS6114594Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an engine stop device for a mobile agricultural machine such as a tractor or combine harvester equipped with a diesel engine.

As is well known, diesel engines installed in mobile agricultural machinery such as tractors and combines are
The engine cannot be stopped simply by turning off the power switch; the fuel supply to the engine must be stopped. Therefore, in the past, the diesel engine was stopped by forcing the control lever to the engine stop position, or by moving a separately provided engine stop lever or knob, etc., to put the fuel injection pump in a non-injection state. However, this engine stopping method required two operations, the above-mentioned engine stopping operation and opening the power switch, after the work was completed, which was cumbersome and caused the engine to stop even after the work was completed. This caused inconveniences such as forgetting to turn off the power switch.

Due to the above-mentioned circumstances, the present invention has developed a solenoid valve that opens when the power switch for starting the engine is opened, in a bypass pipe provided in a part of the lubricating oil flow path by a forced-pressure lubricating oil pump driven by engine operation. A hydraulic cylinder equipped with a piston that is extended and operated by lubricating pressure oil from the solenoid valve is connected to the solenoid valve, and the piston is brought into contact with the governor lever of the engine, and when the power switch is opened, the power is extended through the solenoid valve. Introduce lubricating pressure oil into the hydraulic cylinder,
The object of the present invention is to provide a stopping device for a diesel engine in which the governor lever is rotated to an engine stopping position by the extension of the piston, thereby eliminating the above-mentioned disadvantages.

Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, a diesel engine 1 mounted on a mobile agricultural machine such as a tractor or a combine harvester is equipped with an oil pan 2 at its lower part, and the lubricating oil 3 stored in the oil pan 2 is forcibly fed into the lubricating oil. Suction from suction port 6 with pump 5, oil filter 7
After being filtered through the lubricating oil channels 9 and 9', the lubricating oil is forcibly fed to parts that require lubrication, such as the crankshaft 10, camshaft 11, and each valve mechanism 12, and to the engine stop device 13 of the present invention. Ru. The engine stop device 13 is shown surrounded by a dashed line in FIG. 1, and as shown in detail in FIGS. 2 and 3, a bypass pipe 1 connected to the lubricating oil flow path
5, a hydraulic cylinder 16 connected to the bypass pipe 15, a solenoid valve 17 disposed in the middle of the bypass pipe 15, and a power switch 19 for starting the engine that also opens and closes the solenoid valve 17.
, an engine governor lever 20 operated by the hydraulic cylinder 16 , and a manual control lever 21 operatively connected to the governor lever 20 . More specifically, the solenoid valve 17 shuts off the bypass pipe 15 when the power switch 19 is closed;
Lubricating pressure oil from the lubricating oil flow path 9 is supplied to the hydraulic cylinder 1.
6 side, and conversely, when the power switch 19 is opened, the valve is opened and lubricating pressure oil is guided to the hydraulic cylinder 16. The hydraulic cylinder 16 is equipped with a piston 25 having a piston rod 23 which is housed in a retracted state by a spring 22. When the electromagnetic valve 17 is opened and lubricating pressure oil is introduced, the piston 25 expands and the piston rod is retracted. The governor lever 20, which is in contact with the end portion of the governor lever 23, is pivoted about its pivot point 26. The governor lever 20 is interlocked with a manual control lever 21 by a rod 27, and when the power switch 19 is closed, the piston rod 23 is housed in the hydraulic cylinder 16, and the governor lever 20 is Since the piston rod 23 does not prevent the piston rod from swinging in any way, it swings in accordance with the operation of the manual control lever 21, thereby making it possible to appropriately control the engine speed. Note that the reference numeral 29 in FIG. 2 is a pressure relief bypass pipe provided in the hydraulic cylinder 16, which is connected to the oil pan 2, and the reference numeral 30 and 31 in FIG. The two-dot chain line represents the engine and bonnet of a tractor or the like.

Since the present invention has the above-described configuration, when the power switch 19 for starting the engine is closed and the manual control lever 21 is rotated to the left in the figure from the two-dot chain line position in FIG. 3, that is, the engine stop position. ,
The governor lever 20 is also rotated to the left via the rod 27, and the fuel from a fuel injection pump (not shown) is adjusted to operate the engine, thereby also driving the forced lubricating oil pump 5. At that time, the solenoid valve 17 is closed by closing the power switch 19, so the bypass pipe 1 is connected to the hydraulic cylinder 16.
Lubricating pressure oil is not supplied through the piston 25
As shown by the solid line in FIG. 2, the spring 22 maintains the state housed in the hydraulic cylinder 16. Therefore, since the piston rod 23 remains retracted during engine operation, when the manual control lever 21 is oscillated to control the rotation speed of the engine 1, the piston rod 23 remains retracted.
7, the governor lever 20 swings without being obstructed by the piston rod 23, and can adjust the amount of fuel injected from a fuel injection pump (not shown). Then, by operating the manual control lever 21 to the position shown by the two-dot chain line in FIG. 3, the engine 1 can be stopped manually. Note that at this time, the power switch 19 remains closed.
Next, in the operating state of the engine 1, when the work etc. are completed and the engine 1 is to be stopped, the power switch 19 may be opened without operating the manual control lever 21. Then, the solenoid valve 17 becomes open, and the forced lubricating oil pump 5
The lubricating pressure oil from the lubricating oil flow path 9 and the bypass pipe 15
The piston 25 is moved by the pressure oil into the hydraulic cylinder 16 against the spring 22 to the position shown by the chain line in FIG. is rotated to the right, and engine 1 is stopped. Then, at the same time as the engine 1 stops, the forced-feeding lubricating oil pump 5 also stops, so the lubricating oil pressure in the lubricating oil flow path 9 decreases, and the lubricating oil introduced into the hydraulic cylinder 16 is pumped by the piston 25 by the spring 22. The piston 25 is ejected by leftward movement, and the piston 25 is pushed back to the solid line position, and is automatically reset in preparation for the next stop operation after the engine starts.

As explained above, the present invention provides the lubricant flow path 9
A power switch 1 for starting the engine is installed in part 15 of the
A solenoid valve 17 that opens when the valve 9 is opened is connected to a hydraulic cylinder 16 equipped with a piston 25 that is extended by lubricating oil from the solenoid valve 17, and the piston rod 23 of the piston 25 is connected to the engine governor lever. 20, the forced-pressure lubricant pump and lubricant flow path, which are part of the engine stop device, can be used as they are in conventional engines.
All you need to do is modify a part of the lubricating oil flow path, so there is no need to prepare a separate pump to operate the hydraulic cylinder, resulting in smaller size and lower costs.
Furthermore, since the engine is stopped simply by opening (off) the power switch, the diesel engine can be stopped by simply operating a key switch, for example, in the same way as stopping a general spark ignition engine.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram showing an engine to which the engine stop device of the present invention is applied, Fig. 2 is an enlarged view of the main parts of the engine stop device of the present invention, and Fig. 3 is a diagram showing the engine stop device of the present invention applied to mobile agricultural machinery such as a tractor. FIG. 2 is an assembly diagram showing the engine stop device installed. DESCRIPTION OF SYMBOLS 1... Diesel engine, 5... Forced feed lubricating oil pump, 9... Lubricating oil flow path, 15... Part (bypass pipe), 16... Hydraulic cylinder, 17...
... Solenoid valve, 19 ... Power switch, 20 ... Governor lever, 21 ... Manual control lever,
23... Piston rod, 25... Piston.

Claims (1)

[Scope of utility model registration request] In a diesel engine having a forced lubricating oil pump driven by engine operation,
A solenoid valve is interposed in a part of the lubricating oil flow path, which opens when the power switch for starting the engine is opened.
Furthermore, a hydraulic cylinder is provided with a piston that is actuated to extend by lubricating oil passed through the solenoid valve,
and a stopping device for a diesel engine, wherein the piston is configured to be linked to a governor lever of the engine.