JPS60201032A - Vibration reducing apparatus for diesel engine - Google Patents

Abstract

PURPOSE:To reduce the vibration of a Diesel engine after the engine operation is stopped, by closing an on-off valve provided in an intake passage in conjunction with the operation of the lever of a regulator handle. CONSTITUTION:An on-off valve 16 is provided in an intake passage 15 of a Diesel engine 1. The valve 16 is closed in conjunction with a regulator handle 20 when the engine operation is stopped. By thus lowering the pressure in a cylinder, it is enabled to reduce vibration of the engine when the engine operation is stopped.

Description

[Detailed Description of the Invention] t#! Field of Medicinal Application) The present invention relates to a diesel engine vibration reduction device that effectively reduces engine vibrations that occur when the diesel engine is stopped.

(Prior art) In a diesel engine, when switching the regulator handle from the operating position to the operating stop position to stop engine operation, the fuel supply to the cylinder is stopped immediately after the operating stop operation, or the intake air input action is stopped. This is maintained as long as the engine is rotating inertia even after the engine is stopped (because the intake valve opens and closes). Therefore, during inertial rotation after the engine is stopped, high in-cylinder pressure is generated within the cylinder, and a large thrust force acts on the engine due to the reaction force of this in-cylinder pressure.

In the engine phase, which is caused by the reaction force of the cylinder pressure, it is especially important to directly connect a working machine such as a generator to the engine crankshaft, and to support it with anti-vibration support on a support rod via anti-vibration rubber. In the case of an engine-driven leaf machine, this vibration is disguised as a rolling vibration acting around the crankshaft of the engine, and induces rolling movement of the work machine. For this reason, for example, when the work equipment is installed on a local work scaffold, there is a risk that the work equipment will gradually move and fall from the scaffold.

(Object of the Invention) The present invention is to provide a diesel engine which is capable of effectively reducing engine vibration caused by the reaction force of the in-plane pressure by suppressing the in-plane pressure in the cylinder as much as possible when the engine is stopped. The purpose of this invention is to provide a shaking MMA device.

(Structure of the Invention) The vibration reduction device for a diesel engine of the present invention includes installing an on-off valve for opening and closing the intake passage in the intake passage of a diesel engine, and connecting the on-off valve to a diesel engine regulator handle, When the regulator handle is set to the operation position, the on-off valve is opened, and when the regulator handle is set to the stop position, the on-off valve is closed. The present invention is characterized in that the +1fl closing valve can be opened and closed in conjunction with the above.

(Example) Below, the vibration reduction device for a diesel engine according to the present invention will be explained based on an actual example. A portable power generation device 2 is shown. This power generation device 2 is constructed by connecting a generator 2 to the output shaft (not shown) of an engine and attaching it to a support frame 3 via a plurality of anti-vibration rubbers. .

A regulator handle 20 for controlling the operation of the engine is provided on the side of the engine. Note that this regulator handle 20 can be set alternatively to two positions, an operating position and an operating stop position.
(See Figure rB).

On the other hand, an air cleaner /l is attached to the intake passageway /S that opens at the front face of the cylinder head /3 of the engine / through a valve piece 2II equipped with an on-off valve /6 that opens and closes the intake passageway lj. .

This on-off valve 16 has a lever 26 attached to one end of the valve shaft 25 using a Bowden wire as shown in Figs.
The regulator handle 20 is connected to the front regulator handle 20 via the regulator handle 20, and is opened and closed in conjunction with the lever operation of the regulator handle 20. That is, the regulator handle 20 is set at the operating position. When the opening/closing valve 6 is closed, the opening/closing valve 6 is forcibly opened by the tensile force of the Bowden wire 2/ against the spring force of the return spring 3 as shown in Fig. 3 (A), Figs. It is rotated in the direction of arrow B and set to the fully open position, but when the regulator handle 20 is set to the stop position, the tension on the Bowden wire 2/ is released, so the on-off valve/6 is set to the third position. As shown in Figure rB), it is rotated in the direction of arrow A by the spring force of the return spring 3/ and set to the fully closed position.The opening/closing valve 16 is positioned at the fully open position by a retainer formed at one end of the lever 26. Joint part/6C is valve piece 2t
By engaging with the stopper 30 formed on the upper surface in the direction of arrow B, the on-off valve 16 can be positioned in the fully open position by engaging with the stopper 33.33 provided protruding into the intake passage 3.2 of the valve piece 2μ. This is done by engaging in the EIJA direction, respectively.

In this way, the regulator handle, l! When O is switched from the operation position to the stop position, the on-off valve /6 is forcibly set to the fully closed position in conjunction with the switching operation of the regulator handle 20, and the on-off valve /6 is set to the fully closed position. If the intake passage 15 is configured to be closed,
Engine vibration after the engine operation is stopped can be reduced as much as possible. In other words, if the intake passage 15 is blocked by the on-off valve/B at the same time as the shutdown operation, almost no fresh air will be sucked into the cylinder from the outside even if the engine is still rotating due to inertia after the shutdown operation. Therefore, the internal pressure of the cylinder does not increase much. Therefore, the impact force due to the reaction force of the cylinder pressure is small, and the rolling vibration of the engine 1 is reduced as much as possible. Therefore, as in the illustrated embodiment, the engine/
In the generator device 2, which is directly connected to the generator 2 and which is attached to the support frame 3 via anti-vibration rubbers, it is possible to reduce the
Since the rolling movement is suppressed as much as possible, the power generation device 2
For example, even if the generator is installed on a narrow scaffold, there is no fear that the power generator ρ2 will move and fall from the scaffold, which improves work safety accordingly. Become.

In addition, Fig. 1 and Fig. ! In the figure, code /2 is a fan case, 17 is a muffler, 1g beam filter starter, 2.2
23 is a fuel injection valve, and 23 is a fuel injection pump.

(Effects of the Invention) The diesel engine vibration reduction device of the present invention operates the on-off valve provided in the intake passage of the engine in conjunction with the lever operation of the regulator handle when the engine operation is stopped using the regulator handle. Since the engine is actuated to close the intake passage, the cylinder internal pressure during inertial rotation after the engine operation stop operation is lowered as much as possible, and the engine is stopped when the engine is stopped due to the reaction force of the internal pressure. This has the practical effect of reducing vibration as much as possible.

[Brief explanation of the drawing]

FIG. 1 is a front view of a diesel engine-driven power generator equipped with a vibration reduction device according to an embodiment of the present invention, and FIG.
1-1f main part arrow view in Figure 3 (A) and Figure 3 (B)
) is the operating state diagram of the on-off valve shown in Figure 1, and Figure 2 is the operating state diagram of the on-off valve shown in Figure 1.
Figure S is an enlarged view of the ■ part in the figure, and Figure S is a view taken in the direction of the ■ arrow in Figure Hiroshi. / ・ ・ ・ ・ ・ ・ Diesel engineino ・ ・ ・ ・ ・ ・ 3 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Supported frame 15 ・ ・ ・ F intake passage / Otsu ・ ・ U -mouth dialect 20 ・ ・ ・ Regretor handle 3rd荊(B)

Claims (1)

[Claims] 8. Install an on-off valve (C/O) for opening and closing the intake passage 115) in the intake passage (15) of the diesel engine (1), and connect the on-off valve C/O to the regulator handle (O) of the diesel engine (1). ,20),
When the regulator handle (20) is set to the operating position, the valve C/6) opens;
Further, when the regulator handle C20) is set to the operation stop position, the on-off valve (/6) is opened in conjunction with the handle operation of the regulator handle (20>) so that the on-off valve (/6) is opened. A vibration reduction device for a diesel engine, characterized in that it is configured to be opened and closed.