JPH05231277A - Turning device for internal combustion engine - Google Patents

Abstract

PURPOSE:To perform slow turning drive through remote control without an operator's entrance to an engine room before the starting of an engine by adding constitution to slightly open an on-off valve by which starting air is fed to a cylinder. CONSTITUTION:In an internal combustion engine which is started in a way that compressed air (b) is fed in a cylinder through an on-off valve 3 upon occasion, the on-off valve 3 through which the compressed air (b) for starting is fed is brought into a slight opening state. Namely, in a slow turning device 10, a second piston 5 is arranged to the upper part of a first piston 1 through a push rod 4 and further, the second piston 5 is constantly energized upward through the force of a spring 6 and a gap equivalent to a lift L1 is provided between the cylinder and the second piston. Thus, starting air fed to the cylinder in an internal combustion engine is fed in small quantities through remote control at a control platform and slow turning is practicable. This constitution facilitates starting operation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an open / close valve structure applied to slow turning of an internal combustion engine.

[0002]

2. Description of the Related Art FIG. 2 shows an air opening / closing valve 2 for starting an internal combustion engine.
The whole assembly drawing of is shown. In the internal combustion engine, if engine cooling water or the like accumulates in the cylinder, the engine will be damaged, so this must be confirmed before starting. Therefore, the rotating device with an engine is first driven by a motor to perform slow turning to confirm that there is no abnormality. After that, when the remote start control air signal a is sent to the starting air opening / closing valve 2 by the starting operation of the engine, the piston 1 of the air opening / closing valve 2 is pushed down by the lift amount L2, and the valve 3
Is fully opened and the primary air for starting b passes through the seat portion of the valve 3 to become secondary air for starting c and is supplied to the starting valve of each cylinder as the starting driving pressure and at the same time the starting air is distributed for each ignition sequence. To do. The start valve of each cylinder is opened and closed by the pilot air pressure supplied to the start air control valve and distributed.
The engine was starting.

[0003]

However, as described above, the engine must be turned by the motor drive device in order to detect an abnormal condition such as the accumulation of water in the cylinder before starting the engine. After that, the operator had to go down to the engine room and perform a turning operation to check for any abnormality. At that time, the motor drive device may be forgotten to be removed, and there is a problem that the handling thereof is extremely careful.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the conventional device and to provide a turning device for an internal combustion engine capable of performing a turning drive by remote control without an operator entering the engine room.

[0005]

A turning device for an internal combustion engine according to the present invention is an internal combustion engine in which compressed air is timely sent into a cylinder through an on-off valve to start the compressed air for starting and closing the cylinder. It has a turning device that opens the valve slightly to enable slow turning.

[0006]

By providing the above device, the starting air sent to the cylinder in the engine can be sent little by little by remote control from the driver's cab, so that slow turning is possible. Therefore, it is necessary to enter the engine room and start turning before starting the engine. It is eliminated and the starting operation is facilitated.

[0007]

An embodiment of the present invention will be described below with reference to FIG. The same parts as those of the conventional example are designated by the same reference numerals and the description thereof will be omitted. In the slow turning device 10 shown in FIG. 1, a second piston 5 is provided above a first piston 1 via a push rod 4, and the second piston 5 is constantly urged upward by a spring 6 so that the second piston 5 is connected to the cylinder. Is provided with a gap corresponding to the lift L1. The lift L
1 is set to be smaller than the lift amount L2 of the first piston 1 of the starting opening / closing valve 2 described in the conventional example.

Next, the operation of the above embodiment will be described.
First, when the control air signal d for remote turning is supplied to the second piston 5 to turn the engine by remote control from the driver's cab, the second piston 5 slides downward by the amount of the lift L1 and the valve 3 Is also pushed down by the lift L1. Then, the air b on the primary side for starting passes from the seat portion of the valve 3, but the opening degree of the valve 3 is small, so that only a small amount is supplied. When the control air for turning is supplied to some extent, the start valve of each cylinder is opened via the air control valve for start, and the engine rotates, but the amount of supplied air is small because the opening of the seat portion of the valve 3 is small. Does not rotate as fast as during normal startup. When the turning ends and the air of the remote control air signal d for remote turning is cut off, the second piston 5 is pushed back by the spring 6 and the valve 3 is closed, so that the supply of the primary side air b for starting is performed. The engine stops and stops rotating. Further, when the engine is continuously started, the valve 3 is greatly opened by the lift L2 by the remote start control air signal a, and a large amount of starting air is supplied. Therefore, the engine rotates relatively quickly and the normal starting operation is performed.

[0009]

EFFECTS OF THE INVENTION Since the present invention is configured as described above, it is possible to perform turning on the driver's cab and facilitate the starting operation without a person entering the engine room and performing slow turning using a special rotating device.

[Brief description of drawings]

FIG. 1 is an overall assembly view showing a structure of a starting air opening / closing valve according to a first embodiment of the present invention.

FIG. 2 is a response diagram of FIG. 1 of a conventional example.

[Explanation of symbols]

1 ... 1st piston, 3 ... valve, 5 ... 2nd piston, a ... Remote start control air signal, b ... Primary side air for start, d ... Remote turning control air signal.

Claims (1)

[Claims] 1. In an internal combustion engine, which starts by sending compressed air (b) into a cylinder through an opening / closing valve (3) at a time, the opening / closing valve for sending starting compressed air (b) to the cylinder is opened slightly. A turning device for an internal combustion engine, which has a device and enables slow turning.