JPS6243053B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for rotating the output shaft of a prime mover, in which the output shaft of the prime mover is slowly rotated before the prime mover is started and immediately after the prime mover is stopped.

In prime movers such as large diesel engines, it is necessary to rotate the output shaft slowly before starting and immediately after stopping to prevent seizure. Further, when performing maintenance, adjustment, etc. of a stopped engine, it may be necessary to displace the output shaft by a required angle.

Therefore, an output shaft rotating device, generally called a turning device, is attached to large-sized prime movers.

By the way, the output shaft rotating device must be disconnected from the output shaft when the engine starts normal operation as an internal combustion engine, so generally the pinion that meshes with the large gear fixed to the output shaft must be aligned with the axis. Let it be a pinion that can move in the direction.

Therefore, a drive mechanism that rotates the pinion with a large torque and moves it in the axial direction is required.

A method or device for achieving this purpose has been proposed by the Japanese Patent Publication No. 51-19553.
It is inevitable that the device will have a complicated structure,
There are many problems such as troublesome operation and maintenance.

This invention provides a method for rotating the output shaft of a prime mover that solves the above-mentioned problems, and a device directly used for implementing this method. In order to transmit external power to the large gear of the output shaft, the rotation and axial movement of the pinion are adjusted until the pinion that transmits the external power to the large gear meshes with the large gear. This invention is a method characterized in that the torque and thrust obtained by pressurized air are used, and the torque obtained by an electric motor is used for rotation after engagement is completed.

The second invention is an invention of a device directly used for carrying out the first invention, which rotates a pinion that meshes with a large gear fixed to the output shaft of a prime mover so that it can freely switch between electric and pneumatic movement. This device is characterized in that it includes a drive mechanism and a pneumatic drive mechanism that causes the pinion to move in the axial direction.

Next, the method and apparatus of the present invention will be explained by way of examples with reference to the drawings.

FIG. 1 shows a system diagram of the apparatus of the invention. As shown in the drawing, an output shaft (crankshaft) 2 of a prime mover 1, which is a large diesel engine, for example.
A pinion 4 meshing with a large gear 3 fixed to a shaft 5
The pinion is spline-fitted on the top of the pinion and is supported so as to be able to rotate integrally with the shaft 5 and to move in the axial direction by sliding on the shaft 5.

An intermediate gear 6 is fixed to the shaft 5, and this intermediate gear 6 meshes with an intermediate gear 8 fixed to a shaft 7 parallel to the shaft 5. This intermediate gear 8 has a smaller diameter than the intermediate gear 6. An intermediate gear 9 having a larger diameter than the intermediate gear is fixed to the shaft 7,
This intermediate gear 9 is meshed with a small diameter gear 12 fixed to a shaft 11 of a worm gear 10.

The worm gear 10 has an output shaft 14 of an electric motor 13.
A worm 15 is engaged with the pinion 4, and the pinion 4 is rotated at a reduced speed by the rotational drive of the electric motor 13.

The electric motor 13 is an electric motor having a cooling fan 16, and the part where the fan 16 is housed is provided with pressure air blowing ports 17, 17, and the blown pressurized air rotates the fan 16 and then exits from the discharge port 18 to the outside. leak. By blowing pressurized air to the fan 16, the shaft of the electric motor, which is in a state where it can idle, can be pneumatically rotated.

On the other hand, the pinion 4 is provided with a circumferential groove 19, and the tip of the arm 20A of the pneumatic actuator 20 is engaged with this circumferential groove.

Air pressure is supplied to the pressurized air inlet ports 17, 17 and the actuator 20 in a selective manner by operation valves 21 and 22.

In this embodiment, the operating valve 21 is a locally operated valve, and the operating valve 22 is a remotely operated valve.

Next, a method of rotating the output shaft will be explained based on the apparatus of the above embodiment.

When rotating the output shaft 2 to drive the lubrication system before starting or immediately after stopping the prime mover 1, the actuator 20 is rotated from the state shown by the solid line in FIG. The output shaft 1 of the electric motor 13 is driven to engage the pinion 4 with the large gear 3.
4 to change the phase of the teeth of pinion 4.

The rotation of this pinion 4 requires pressure air inlet 1.
Pressurized air is blown from 7 and 17 to rotate the fan 16.

After the pinion 4 meshes with the large gear 3, the blowing of pressurized air is stopped, and at the same time, the electric motor 13 is energized to rotate the output shaft 14 of the electric motor.

After the output shaft 2 is rotated by the electric motor 13 for a required time, the actuator 20 is driven again to disengage the pinion 4 and the large gear 3 when driving the prime mover 1 as an internal combustion engine.

As is clear from the above description, according to the present invention, the pinion is engaged with the large gear fixed to the output shaft of the prime mover using air pressure, so even if the engagement is poor, It has many excellent effects, such as being able to easily absorb resistance, operating safely and reliably, making the device extremely simple and suitable for remote control and automatic unmanned operation.

[Brief explanation of the drawing]

Fig. 1 is a system diagram showing an embodiment of the device of the present invention, Fig. 2 is a sectional view showing the fan part of the electric motor,
FIG. 3 is a side view of the electric motor with a portion removed.
In the drawings, 1... prime mover, 2... output shaft, 3... large gear,
4...Pinion, 5...Shaft, 13...Electric motor, 1
4...Output shaft, 15...Worm, 16...Fan, 17...Pressure air inlet, 18...Exhaust port,
19... Circumferential groove, 20... Actuator, 20A
...Arm, 21, 22...operation valve.

Claims (1)

[Scope of Claims] 1. When transmitting external power to the large gear of the output shaft in order to rotate the output shaft of the motor immediately before starting and immediately after stopping the motor, a pinion that transmits the external power to the large gear is connected to the large gear. The torque and thrust obtained by pressurized air adjusted to the rotation and axial movement of the pinion are used until the pinion is engaged, and the torque and thrust obtained by the electric motor are used for rotation after the engagement is completed. A method of rotating an output shaft of a prime mover, characterized by utilizing the following. 2. A rotary drive mechanism in which a pinion that meshes with a large gear fixed to the output shaft of the prime mover can be freely switched between electric and pneumatic drive, and a pneumatic drive mechanism that causes the pinion to move in an axial direction. The main feature is the output shaft rotation device of the prime mover.