JPH02120539A - Super-type large reduction gear device and assembly method therefor - Google Patents

Abstract

PURPOSE:To ensure easy assembly work by supporting super-type large reduction gear of an output system via a fixed bearing in a gear casing, while supporting the small reduction gears of an input system for gearing with the large gear at both sides thereof via a movable bearing. CONSTITUTION:A super-type large reduction gear 7 is so mounted in a gear casing as to be rotatable via a gear axis 14a supported on a pair of fixed bearings 14 and 14 fitted in the gear casing. At both right and left sides of the large gear 7 are arranged small gears 5 and 6 for gearing therewith. Namely, the small gear 5 with the gear axis 5a thereof supported on a pair of movable bearings 12 and 12 is mounted in such a way that the position and posture of the gear axis 5a is adjusted to give an optimum gearing condition with reference to the large gear 7. Also, as the gear axis 5a is used in common with the gear axis 2a of the second large gear 2, the movable bearings 10 and 10 thereof are automatically set. Furthermore, the mounting of the second small gear 1 for gearing with the large gear 2 is made while a pair of movable bearings 8 and 8 is being adjusted. Also, each of gears 3, 4 and 6 at the left side is similarly mounted.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an ultra-large reduction gear device disposed on the output side of a steam turbine, etc., and a method for assembling the same, and in particular to an easy adjustment of meshing of gears during assembly. This invention relates to a super large i* gear device and its assembly method.

[Conventional technology]

-7112, a ship with a turbine as the motive force has two main turbines, and the output of each main turbine is determined by a gear reduction gear equipped with two input system reduction gears. The signal is inputted through this reduction gear fD wheel, and taken out through an extremely large reduction gear wheel of the output system that meshes with the reduction pinion on both sides thereof.

The ultra-large reduction gear device placed on the output side of the conventional main turbine for ships has an ultra-large reduction gear in the output system whose gear shaft is supported by a fixed bearing installed in the gear chamber. In addition, input system small reduction gears meshing with both sides of the large reduction gear are also provided with their gear shafts supported by fixed bearings installed in the gear chamber.

[yN problem to be solved by the invention] By the way, in -a, in the ultra-large reduction gear system π disposed on the output side of the main turbine for a ship, the ultra-large reduction gear of the output system is Since it is extremely large, with a diameter of about 5 mm, the gear room in which it is placed is also huge, measuring 8 mm in width and 611 mm in length.

Therefore, in order to achieve a satisfactory meshing condition between a large number of gears, the machining of the gear chamber must be performed by adjusting the polling accuracy of the bearings of each gear, the parallelism between the bearings, or the halving accuracy with the horizontal joint surface. Extremely strict control is required to ensure accuracy down to the micron level.

However, the current state of the art is that with current machining techniques, it is impossible to machine such a huge gear chamber as described above to the required accuracy.

On the other hand, conventionally, fixed bearings have been used to attach each gear to the σ1 wheel box, as described above.

That is, in FIG. 3 showing one example, the fixed bearing is a semicircular receiving portion 25a formed on the support base 25 of the gear chamber.
a lower bearing half 22 held by the lower bearing half 22; and a bearing part 23 which is coupled to the support 25 by holding the upper bearing half 21 disposed opposite to the lower bearing half 22 on its inner surface. The bearing lower half 22 and the bearing upper half 21 (J'x car II
It is configured to rotatably support Ith20.

Therefore, with a fixed bearing, the position and orientation cannot be adjusted during assembly. Therefore, manufacturing errors or installation errors in the gear chamber and the bearing will occur during assembly. By correcting the contact between the back surface of the bearing part 23 and further by correcting the contact between the gear shaft 20 and the upper half 21 and lower half 22 of the bearing, the absorption was made possible.

However, since the above-mentioned correction is done manually by a skilled person, there are problems in that it takes a lot of time and is disadvantageous in terms of cost.

The present invention aims to solve these problems, and includes supporting an extremely large deceleration gear in the output system via fixed bearings in the vehicle interior, and supporting both sides of the deceleration gear. By supporting the input system reduction gears (1) that mesh with each other via movable bearings that are installed in the gear chamber and whose position and orientation can be adjusted, the assembly of the reduction gear device can be adjusted to the meshing adjustment J3. The purpose of the present invention is to provide an ultra-large deceleration gear system π that can be used while carrying out a , input system reduction gears meshing with both sides of the reduction gear, respectively, are installed in the gear box and the position and orientation can be adjusted via bearings, using the large gear as a base, To provide a method for assembling an ultra-large reduction gear device by which the reduction gear device can be assembled by installing the reduction gear device in a gear chamber while adjusting meshing.

[Means to solve the problem]

In order to achieve the above-mentioned object, the ultra-large reduction m wheel device of the present invention has an ultra-large reduction gear U↑ wheel in the output system and a 1b wheel 1! of the same large gear. A fixed bearing that supports Il' and is installed in the gear chamber, a reduction gear of the input system that meshes with both sides of the large tooth 1i, and a device that supports the axles of these small gears and is installed in the float chamber. a lower half of the bearing disposed on the support side of the gear chamber; an upper half of the bearing disposed opposite the lower half of the bearing;
A bearing part that holds the upper half of the bearing on its inner surface is connected to the bearing part and holds the lower half of the bearing to adjust its position and orientation with respect to the support base of the gear chamber. It is characterized by being configured with a bearing support that can be installed by
In addition, when assembling a super large reduction gear, the filling method is to install the gear shaft of the super large reduction gear in the output system into the gear chamber via a fixed bearing, and then insert it into the same gear chamber. The gear shafts of the small gears for reduction of the input system that mesh with both sides of the main street car are mounted via movable bearings, and the position and orientation of the gear shafts of the small gears are adjusted by the movable bearings. , is characterized in that it is carried out based on the above-mentioned large gear.

[For production]

In the above-mentioned ultra-large reduction gear device of the present invention, the reduction gear 1n
By adjusting the position and orientation of the gear shaft, the gear can be installed in the gear chamber while adjusting the engagement. Then, the ultra-large reduction gear unit U can be assembled by installing the reduction gear in the gear chamber while adjusting the meshing.

〔Example〕

Hereinafter, the drawings will show an example of a super large scale model according to an embodiment of the present invention. i!
To explain the reduction gear device and its assembly method,
1U2 is a plan view of the ultra-large reduction gear device, and FIG. 2 is a longitudinal sectional view of the movable bearing.

Note that the same reference numerals as in FIG. 3 indicate the same members. On the upper surface of the support stand 25 of the float chamber, there are lip-shaped support surfaces 2 on both sides.
A protruding bearing support 24 4a is disposed, and a bearing lower I'' portion 22 is held on the inner surface of this bearing support 24. The bearing retainer 23, which holds the bearing upper half 21 on its inner surface, has rib-shaped joint surfaces 2311 protruding from both ends thereof, and is fastened to the upper surface of the support surface 24a with bolts (not shown). As a result, the movable bearing is erected.

Note that the gear shaft 20 is rotatably supported by the bearing upper half 21 and the bearing lower half 22, as in the case of FIG. 3.

A hole through which a fastening bolt (not shown) can pass is provided in the support surface 25 so that the bearing support 24 can be attached along the upper surface of the support base 25 so as to be adjustable in the front-rear direction and the left-right direction.
It is drilled at 4+1.

Note that the arc-shaped portion 25. of the support base 25. is the bearing support 24
(Details will be explained later)
The shape is such that there is a small distance from the bearing support 24.

With the configuration described above, the movable bearing can be adjusted in position forward and backward as well as left and right with respect to the support base 21.
By interposing the lie 26 between the upper surface of the support base 25 and the lower surface of the support surface 24a, it is also possible to adjust the position in the height direction.

Also, place this liner 26 on either the left or right side of the support base 25.
It is obvious that the posture of the movable bearing can be adjusted when it is placed only in the front, only in either the front or rear, or in a combination of these positions.

Next, I will explain how to assemble the reduction gear device.
In FIG. 1, an extremely large deceleration gear 7 in the output system is supported by a gear shaft 14a serving as its output shaft in a pair of fixed bearings 14 and 14 of the front fJcl pair installed in an m-wheel box. Rotatably mounted indoors. The code 14b is 1
1 m llk 14 a) Shows the coupling member provided at the Itt end.

On both the left and right sides of the large gear 7 mentioned above, there are small gears on the left and right sides.
1all'E5.6 are arranged to mate. That is, the small DI wheel 5 is mounted with its gear shaft 5a supported by a pair of front and rear movable bearings 12.12 that are not installed in the gear chamber. This is done while adjusting the position and attitude of the gear shaft 5a of the small gear 5 so that the best meshing state can be obtained based on the gear.

In addition, in this embodiment, the gear shaft 5a is the second large ω wheel 2.
Since the gear shaft 2a is common to the gear shaft 2a, its movable bearing 10.10 will also be automatically set by the above-mentioned 'A'. As for the +A attachment of the second small gear 1 which is engaged with the large gear 2, a pair of movable bearings 8 supporting the gear shaft 1a are provided so as to obtain the best meshing state with the large gear 2. This is done while adjusting .8 as in the case of the small AJ vehicle 5.

Reference numerals 1'b and 9b in the figure indicate coupling members provided at the front ends of the gear shafts 1a and 9a, respectively, and connected to the turbine rotation 1IllIl (not shown).

Furthermore, it goes without saying that the gears 3, 4, and 6 on the left side are installed in the gear chamber in the same manner.

'' With the double configuration, the super large deceleration gear that is located in the output system, which is the largest fh vehicle and located in the center, is first fixed L, and then the other gears are Gears, part 1
Since the gear system is assembled by sequentially installing the 1'X axle into the gear chamber while adjusting the position and orientation via the movable bearing, the assembly work is extremely simple, and
Manufacturing errors and installation errors in gear chambers and bearings are absorbed by adjusting the movable bearings, so there is no need for manual labor by particularly skilled workers, which is advantageous in terms of assembly time and cost. .

〔Effect of the invention〕

As mentioned above, the super large reduction gear of the present invention! According to the A position and the 4) method, the following effects or advantages can be obtained.

(1) First fix the super large deceleration gear in the output system, which is the largest gear and is located in the center position, and then use this as a reference to move the small gears in the input system and its gear shaft to the movable bearing. Since the gear device is assembled by attaching it to the gear chamber while adjusting the position and orientation by 7A, the assembly work becomes extremely simple.

(2) Errors due to machining precision of the gear chamber and bearings and installation errors are absorbed by adjustment of the movable bearings, eliminating the need for manual work by particularly skilled workers. Moreover, it is advantageous in terms of 11-hour setup time and cost.

(3) Since the bearing support can be machined as a single unit separately from the float chamber, the bearing support can be machined in one go.

[Brief explanation of drawings]

Figure 1.2 shows an ultra-large reduction gear device as an embodiment of the present invention and an ultra-large W assembled by the vertical method.
1 is a plan view thereof, and FIG. 2 is a longitudinal cross-sectional view of a movable bearing used in the 11I wheel system shown in FIG. 1. FIG. 3 is a longitudinal sectional view of a fixed bearing used in a conventional ultra-large reduction gear device. 5.6... Small gear for reduction, 7... Large gear for reduction, 8.9
．． 10, 1.1.12.13...Movable bearing, 14 Fixed bearing, 20...Gear shaft, 21...Bearing upper part, 22...,
Bearing lower half, 23...Bearing holder, 24...Bearing support, 2
5. Support stand, 26. Liner. Agent Patent Attorney Yoshihiko Iinuma Figure 1 4b +4a

Claims (2)

[Claims] (1) An extremely large reduction gear in the output system, and a fixed bearing that supports the gear shaft of the same large gear and is installed in the gear chamber.
The input system has reduction gears that mesh with both sides of the large gear, and movable bearings that support the gear shafts of these small gears and are installed in the gear chamber. A lower half of the bearing disposed on the support stand side, an upper half of the bearing disposed opposite the lower half of the bearing, a bearing holder that holds the upper half of the bearing on its inner surface, and A bearing support, which is coupled to a bearing holder, holds the lower half of the bearing, and is attached to the support base of the gear chamber by adjusting the position and orientation thereof. Large reduction gear device. (2) When assembling an ultra-large reduction gear, the gear shaft of the ultra-large reduction gear in the output system is installed in the gear chamber via a fixed bearing, and then the gear shaft of the ultra-large reduction gear in the output system is installed inside the gear chamber on both sides of the large gear. The gear shafts of the reduction gears of the input system that mesh with each other are mounted via movable bearings, and the positions and postures of the gear shafts of the small gears are adjusted using the movable bearings with reference to the large gear. A method for assembling an ultra-large reduction gear device, characterized by: