JP2002155760A - Reduction gear of gas turbine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reduction gear of gas turbine to be miniaturized smaller than an existing one. SOLUTION: The reduction gear of gas turbine transmits power to an output shaft by reducing the rotational speed of a main shaft driven by the gas turbine with an epicyclic gear mechanism. In the reduction gear, at least three spur gears are disposed between a starter gear and the epicyclic gear mechanism, and the output shaft is disposed on the opposite side to the starter gear relative to the epicyclic mechanism.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas turbine speed reducer having a planetary gear mechanism for reducing the rotational speed of a turbine shaft (main shaft) and transmitting power to an output shaft.

[0002]

2. Description of the Related Art FIG. 3 is a schematic vertical sectional front view of a conventional gas turbine 200. As shown in FIG. The gas turbine 200 includes a power unit section 91 and a speed reducer 90. The power unit section 91 is disposed on the left side of the two-dot chain line 99, and the speed reducer 90 is disposed on the right side of the two-dot chain line.

The power unit 91 has a main shaft 93 which is a rotating shaft of a turbine driven by high-pressure gas. The main shaft 93 is connected to planetary gear mechanisms 92, 92 of a speed reducer 90.
Power is transmitted from an output shaft 95 to an auxiliary device (not shown) such as a generator through an intermediate shaft 98, an intermediate gear 97, and an output gear 96.

In the gas turbine 200 shown in FIG. 3, a starter gear 89 is provided on an output shaft 95, and the starter gear 89 and the output gear 96, the intermediate gear 97, the intermediate shaft 98, the planetary gear mechanism 92, and the main shaft 93 are provided via the starter gear 89. Starter 9
4 can be transmitted to the power unit 91 side.

In the conventional general gas turbine 200 shown in FIG. 3, the starter 94 is arranged on the side of the power unit 91 as shown in FIG. , Length in the left-right direction in FIG. 4). Therefore, in order to transmit power between the output shaft 95 and the intermediate shaft 98, one or both of the output gear 96 and the intermediate gear 97 need to have a large diameter. Therefore, when the output gear 96 (intermediate gear 97) has a large diameter, it must be unnecessarily extended in a direction other than the direction connecting the intermediate shaft 98 and the output shaft 95, resulting in an increase in the size of the device. .

[0006]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a reduction gear for a gas turbine which can be made smaller than before.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, according to the present invention, a speed reducer for a gas turbine for transmitting power to an output shaft by reducing the rotational speed of a main shaft driven by the gas turbine by a planetary gear mechanism. , At least three spur gears are arranged between the starter gear and the planetary gear mechanism, and the output shaft is arranged on the side opposite to the starter gear with respect to the planetary gear mechanism.

[0008]

FIG. 1 is a schematic longitudinal sectional front view of a gas turbine 100 according to the present invention. Also, FIG.
FIG. As shown in FIG.
Reference numeral 0 denotes a power unit 25 and the speed reducer 4. The power unit 25 is disposed on the left side of the two-dot chain line 15, and the speed reducer 4 is disposed on the right side of the two-dot chain line.

The power unit 25 has a turbine shaft (main shaft 2) driven by high-pressure gas. A spline portion 2a is provided at an end of the main shaft 2 protruding toward the speed reducer 4 side. The reduction gear 4 is provided with the planetary gear mechanism 1. The power unit 25 and the speed reducer 4 are connected to the spline 2 a of the main shaft 2 by the planetary gear mechanism 1. Power transmission between the power unit 25 and the speed reducer 4 is performed by the main shaft 2 and the planetary gear mechanism 1.

The reduction gear 4 has a first intermediate shaft 16 which is concentric with the main shaft 2 and has an idler gear 13, an output shaft 3 which has an output gear 7 and outputs power to an auxiliary device (generator) not shown. Starter gear 5 for transmitting power from starter 14, accessory gear 20, intermediate large gear 18, and intermediate small gear 1
9 and so on.

The starter pinion 6 of the starter 14 meshes with the starter gear 5. The auxiliary gear 20 integrally fixed with the starter gear 5 and the auxiliary shaft 21 meshes with the intermediate small gear 19. Further, the intermediate small gear 19 and the second
An intermediate large gear 18 integrally fixed via an intermediate shaft 17 is
It is in mesh with the idler gear 13. These groups of gears allow the starter 14 to move the main shaft 2 (the power unit 2).
5) Power can be transmitted to the side.

The output gear 7 fixed to the output shaft 3 in the speed reducer 4 of FIG.
And the starter pinion 6 of the starter 14
Are not arranged on the path for transmitting the power from the main shaft 2 to the main shaft 2. Further, the reduction ratio is adjusted by the gear ratio of the idler gear 13 and the large intermediate gear 18, and the small intermediate gear 19 and the auxiliary gear 20.

In the speed reducer 4 shown in FIG. 1, the output shaft 3 is
The auxiliary shaft 21 is attached to the first intermediate shaft 16 (the planetary gear mechanism 1).
1 (below the first intermediate shaft 16 in FIG. 1). By arranging the output shaft 3 in this manner, the output gear 7 and the gear portion 16a (the output gear pair 7, 16
Since a) can be reduced in size, the reduction gear 4 can be reduced in size as a whole.

FIG. 2 is a view taken in the direction of arrows II-II in FIG. FIG.
As shown in the figure, the auxiliary shaft 21 and the auxiliary gear 22 for driving the governor 27 can be arranged at positions symmetrical to the auxiliary shaft 21 and the auxiliary gear 20 with respect to the intermediate large gear 18 and the intermediate small gear 19. Thus, the auxiliary shaft 23 and the auxiliary gear 22
Is arranged, the size of the gas turbine can be further reduced. The governor 27 is located at the position shown in FIG.
The arrangement is convenient because maintenance can be performed easily.

As shown in FIG. 2, when the idler gear 13, intermediate large gear 18, and intermediate small gear 19 of the power transmission system are disposed in the middle and auxiliary gears 20, 22 are disposed on the left and right of these, the reduction gear 4 Can be made smaller and more compact.

[0016]

According to the present invention, the starter gear 5 and the speed reducer 4
At least three gears are arranged between the planetary gear mechanism 1 and the planetary gear mechanism 1 to reduce the diameter of each gear, and
Is arranged on the side opposite to the starter gear 5 with respect to the planetary gear mechanism 1, so that the reduction gear 4 can be made smaller than the conventional reduction gear 90.

[Brief description of the drawings]

FIG. 1 is a schematic longitudinal sectional front view of a gas turbine according to the present invention.

FIG. 2 is a view taken in the direction of arrows II-II in FIG.

FIG. 3 is a schematic vertical sectional front view of a conventional gas turbine.

FIG. 4 is a plan view of a conventional gas turbine.

[Explanation of symbols]

 Reference Signs List 1 planetary gear mechanism 2 main shaft 3 output shaft 4 reducer 5 starter gear 6 starter pinion 7 output gear 13 idler gear 14 starter 16 first intermediate shaft 17 second intermediate shaft 18 intermediate large gear 19 intermediate small gear 20, 22 auxiliary gear 21 , 23 Auxiliary shaft 25 Power unit

Claims (1)

[Claims] 1. A gas turbine speed reducer for transmitting power to an output shaft by reducing the rotation speed of a main shaft driven by a gas turbine by a planetary gear mechanism, wherein at least three flat gears are provided between a starter gear and the planetary gear mechanism. A speed reducer for a gas turbine, wherein a gear is arranged, and an output shaft is arranged on a side opposite to a starter gear with respect to a planetary gear mechanism.