CN110549274B

CN110549274B - Helicopter rotating disc bearing and fixing disc mounting and positioning tool and mounting method

Info

Publication number: CN110549274B
Application number: CN201910937459.7A
Authority: CN
Inventors: 丁文君; 李雪; 刘佳惠
Original assignee: Harbin Aircraft Industry Group Co Ltd
Current assignee: Harbin Aircraft Industry Group Co Ltd
Priority date: 2019-09-29
Filing date: 2019-09-29
Publication date: 2021-06-01
Anticipated expiration: 2039-09-29
Also published as: CN110549274A

Abstract

The invention belongs to the helicopter assembly technology, and particularly relates to a mounting and positioning tool and a mounting method for a rotating disc bearing and a fixed disc of a helicopter. The helicopter rotating disc bearing and fixing disc mounting and positioning tool comprises a guide ring (1), a guide support (3) and a fixing mechanism. The guide ring is of an annular structure with a positioning hole, the outer diameter size of the guide ring is matched with the inner diameter of the rotary disc bearing, the outer surface of the guide ring is provided with a guide groove (5) separated by 180 degrees, the guide groove is matched with the positioning groove of the bearing inner ring in position, the guide support is of a support structure with two guide posts matched with the guide groove, and the support structure is arranged on the guide ring and matched with the guide groove through the guide posts. The invention realizes accurate installation and positioning between the rotary disc bearing and the fixed disc by utilizing the guide ring and the guide bracket, and is locked by the locking plate, thereby having simple structure, convenient operation, accurate positioning, high installation efficiency and larger practical application value.

Description

Helicopter rotating disc bearing and fixing disc mounting and positioning tool and mounting method

Technical Field

The invention belongs to the helicopter assembly technology, and particularly relates to a mounting and positioning tool and a mounting method for a rotating disc bearing and a fixed disc of a helicopter.

Background

As shown in fig. 1, the top main rotor and the lower main shaft of the helicopter are sleeved with a rotating disk 12, which is used for rotating synchronously with the rotors, and a fixed disk 13, which is matched with the rotating disk and used for not rotating along with the main rotor, is fixed on the shell of the main speed reducer, and the top main rotor and the lower main shaft are connected by a large ball bearing 11.

In order to enable the bearings to be tightly matched with each other, the bearings are required to be installed in the central inner hole 22 of the rotating disc, the diameter of the outer ring of each bearing is slightly larger than that of the central inner hole of the rotating disc, interference fit is formed among the bearings, and installation cannot be carried out normally, so that installation is carried out by a temperature difference method.

The temperature difference method is characterized in that a principle of expansion with heat and contraction with cold is utilized, a rotating disc is placed in a heating box to be heated to 130 ℃, the temperature is kept for 30 minutes, a central inner hole of the rotating disc expands due to heating, the diameter size of the central inner hole is slightly larger than that of an outer ring of a bearing 11, so that the bearing is easily placed in the central inner hole of the rotating disc, after the bearing is placed in the central inner hole, the rotating disc is naturally cooled at normal temperature, the central inner hole of the rotating disc gradually shrinks and is tightly embraced on the outer ring 15 of the bearing when the central inner hole of the rotating disc is cooled to the room temperature, and.

The diameter of the bearing inner ring 18 on the rotating disc is slightly smaller than that of the outer surface of the boss 20 on the fixed disc, the installation between the bearing inner ring and the boss is still in interference fit, and the installation method is still a temperature difference method.

The rotating disc provided with the bearing is placed in a heating box, the temperature is heated to 130 ℃, the temperature is kept for 30 minutes, the bearing inner ring 18 on the rotating disc expands due to heating, the diameter size is slightly larger than the diameter of the outer surface of the boss on the fixed disc, an operator wears heat insulation gloves to take the rotating disc out of the heating box, and the bearing inner ring is rapidly sleeved on the outer surface of the boss of the fixed disc.

At this point, an important installation step is reached to adjust the positioning. There are two location notches 14 on the bearing inner ring upper surface, in order to install the locking plate, this notch should be in the central position of two holes on the boss surface of fixed disk, at this moment will be fast with the locking plate adjustment while installing, at this moment the bearing inner ring cools off gradually at room temperature, because the principle of the shrinkage that rises with heat, the inner ring diameter size diminishes gradually, before the boss surface of bearing inner ring and fixed disk closely locks, with locking plate position installation adjustment correct, whole process is nervous relatively, lock easily, the success rate is lower, influence helicopter assembly quality and efficiency.

Disclosure of Invention

The purpose of the invention is: the positioning tool and the mounting method can realize quick and accurate positioning and effectively improve the mounting power of the rotary disk bearing and the fixed disk of the helicopter.

The technical scheme of the invention is as follows: the utility model provides a helicopter rotary disk bearing and fixed disk installation location frock, its includes guide ring 1, guide bracket 3 and fixed establishment, wherein, the guide ring is the annular structure who has the locating hole, and its external diameter size and rotary disk bearing internal diameter phase-match, and the guide ring surface is provided with 180 degrees guide ways 5 of being separated by, the guide ways matches with the location notch position of bearing inner circle, the guide bracket is the supporting structure who has two guide posts that match with the guide ways, sets up on the guide ring to through the cooperation of guide post and guide ways, realize the location to the guide ring, fixed establishment sets up in the locating hole on the guide ring.

The guide groove on the guide ring corresponds to the position of the positioning notch on the upper surface of the inner ring of the rotary disc bearing, and the bottom of the guide column arranged on the guide groove is arranged on the positioning notch on the inner wall of the rotary disc bearing, so that the precision positioning between the rotary disc and the fixed disc is realized.

The fixing mechanism is a bolt, a screw or a fixing rod and is used for installing and positioning the guide ring.

The guide way is the rectangular groove that surpasss outer open-ended, and the guide post is rectangular post, avoids the rotation in the installation to skid, improves positioning accuracy and installation success rate.

The guide ring, the guide support and the guide upright are all made of metal, preferably aluminum alloy, so that the heated bearing can be cooled quickly.

The utility model provides a helicopter rotary disk bearing and fixed disk mounting method based on frock, pass through the locating hole and fixed establishment setting the guide ring on the fixed disk boss earlier, then place the guide bracket on the rotary disk bearing inner ring upper surface location notch after the heating, then adjust rotary disk bearing position for the rotary disk bearing cup joints on the boss of guide ring and fixed disk, and the guide bracket is packed into the guide way of guide ring simultaneously, and the bearing after the heating cools down the shrink rapidly, firmly hoops on the boss outer cylinder surface of fixed disk.

The rotating disc is subjected to heating treatment before the guide support is installed, the heat treatment temperature is 120-150 ℃, and the time is 20-40min, so that sufficient temperature is ensured, the bearing can be subjected to sufficient thermal expansion to be smoothly installed on the boss of the fixing disc, and the phenomenon that the temperature is too high to denature or deform materials is avoided.

And taking out the guide support, dismantling the fixing mechanism and the guide ring, and then installing a locking plate on the positioning notch on the upper surface of the inner ring of the rotating disc bearing to realize the accurate positioning and installation of the rotating disc bearing and the fixed disc.

The invention has the advantages that: the mounting and positioning tool for the rotary disc bearing and the fixed disc of the helicopter utilizes the guide ring and the guide support to realize accurate mounting and positioning between the rotary disc bearing and the fixed disc, and utilizes the small notch of the inner ring of the bearing and the two holes on the fixed disc to realize accurate positioning, so that the locking plate can be smoothly mounted, the tool positioning is changed from the conventional operation depending on the skill of a person, and the success rate of products reaches 100%. In addition, the weight is controlled within 2 kilograms, and the portable electric water heater is convenient to use and carry. The tool is simple in structure, easy to manufacture, convenient to carry, accurate in positioning and good in using effect, and the total weight of the tool is 1.5 kilograms due to the use of aluminum.

Through years of practical application, the fixed disc and the rotating disc for assembling a group of helicopters are shortened to 10 minutes from 1 hour in the past, and the efficiency is improved as follows: the (60-10)/60x100 percent is 83.33 percent, the success rate is improved from the previous 50 percent to 100 percent, the success rate is improved by one time of the whole process, the assembly work of a fixed disc and a rotating disc of a helicopter is greatly facilitated, the effect is obvious, and the method has larger practical application value compared with the prior art.

Drawings

FIG. 1 is a schematic structural diagram of a helicopter rotating disc, a bearing and a fixed disc before installation;

FIG. 2 is a schematic structural diagram of a rotating disk and a bearing of the helicopter before installation;

FIG. 3 is a schematic structural view of a mounting and positioning tool for a rotating disc bearing and a fixed disc of a helicopter according to the present invention;

FIG. 4 is a structure after the installation of the rotating disc and the bearing;

FIG. 5 is a schematic view of the installation process of the rotary disk bearing and the fixed disk of the helicopter of the present invention;

FIG. 6 is a schematic view of the installation of the locking tab;

the locking device comprises a guide ring 1, a guide ring 2, four bolts 3, a guide support 4, a guide square column 5, a guide groove 6, ten holes 11, a bearing 12, a rotating disc 13, a fixed disc 14, a positioning notch (matched with locking plates) 15, an outer ring 17, locking plates (two) 18, an inner ring 20, a boss 21, two holes 22 in the fixed disc and a central inner hole of the rotating disc.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be described in further detail with reference to the accompanying drawings and specific embodiments. Certain features that are well known to those skilled in the art have been omitted from the following description for the sake of simplicity.

Example 1: assembling parts on a certain helicopter: bearing on rotary disk and fixed disk mounting location

Referring to fig. 1 and 2, the parts to be assembled according to the present invention include: rotary disk 12, bearing 11, fixed disk 13, locking plate 17.

Referring to fig. 3, the mounting and positioning tool for the rotating disc bearing and the fixed disc of the helicopter comprises three parts. The first part is a guide ring 1, the selected material is an aluminum plate, a circular ring is turned firstly, then a circle of ten holes 6 with the same positions as a fixed disc are machined by a numerical control machining center, and then the outer surface of the guide ring is milled to obtain a guide groove 5 which is separated by 180 degrees and has a strict relative position relation with the circle of ten holes which are machined.

The second part is a fixing mechanism for fixing the guide ring, which in this embodiment is four bolts 2.

The third part is a guide support 3, which serves as a guide. The selected material is an aluminum plate, an aluminum block is firstly processed, then the shape of the guide support and two guide columns are milled by a numerical control processing center, the two guide columns are guide square columns 4, and the shape, the size and the position relation are required to be accurate so as to be strictly matched with a bearing positioning notch and a guide groove of a guide ring.

Referring to fig. 5, the following provides a method for mounting a rotating disk bearing and a fixed disk of a helicopter according to the present invention, and the specific application process is as follows:

when the rotary disc heating device is used, the fixed disc 13 is horizontally placed on the workbench, the guide ring 1 is fixed on the boss 20 of the fixed disc through the four bolts 2, the rotary disc 12 with the bearing 11 is taken out of the heating box, the guide support 3 is placed on the positioning notch 14 of the bearing and then is held above the fixed disc, the two guide square columns 4 of the guide support are aligned to the guide groove 5 of the guide ring, the rotary disc with the bearing is horizontally and slowly dropped down, after the rotary disc with the bearing is dropped to the position, the bearing is rapidly cooled and contracted, and finally the rotary disc is firmly hooped on the outer cylindrical surface of the boss of the fixed disc.

The positioning notch 14 on the bearing inner ring and the two holes (21 in figure 6) on the fixed disc are accurately positioned, and the locking plate (17 in figure 6) can be successfully installed.

The airplane type produces a plurality of airplanes in batches, and the invention effectively changes the work of assembling with low efficiency in the past into the work of high efficiency and high quality.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a helicopter rotary disk bearing and fixed disk installation location frock, its characterized in that includes guide ring (1), guide holder (3) and fixed establishment, wherein, the guide ring is the annular structure who has the locating hole, and its external diameter size and rotary disk bearing internal diameter phase-match, and the guide ring surface is provided with guide way (5) 180 degrees apart from, the guide way matches with the location notch position of bearing inner race, the guide holder is the supporting structure who has two guide posts that match with the guide way, sets up on the guide ring to through the cooperation of guide post and guide way, realize the location to the guide ring, fixed establishment sets up in the locating hole on the guide ring.

2. The mounting and positioning tool for the rotary disc bearing and the fixed disc of the helicopter according to claim 1, wherein the bottom of the guide post mounted on the guide groove is mounted on the positioning notch of the inner wall of the rotary disc bearing.

3. The helicopter rotating disc bearing and fixed disk mounting and positioning tool of claim 1 wherein the fixing mechanism is a bolt or screw.

4. The helicopter rotating disc bearing and fixed disc mounting and positioning tool of claim 1 wherein the guide slot is an outwardly opening rectangular slot and the guide post is a rectangular post.

5. The helicopter rotating disc bearing and fixed disc mounting and positioning tool of claim 1 wherein the guide ring and guide bracket and guide post are metal.

6. A helicopter rotating disc bearing and fixed disc installation method based on the tooling according to any one of claims 1 to 4 is characterized in that a guide ring is arranged on a boss of a fixed disc through a positioning hole and a fixing mechanism, then a guide support is placed on a positioning notch on the upper surface of an inner ring of a heated rotating disc bearing, then the position of the rotating disc bearing is adjusted, so that the rotating disc bearing is sleeved on the bosses of the guide ring and the fixed disc, meanwhile, the guide support is arranged in a guide groove of the guide ring, and the heated bearing is rapidly cooled and shrunk and is firmly hooped on the outer cylindrical surface of the boss of the fixed disc.

7. A method for mounting a rotary disc bearing and a fixed disc of a helicopter according to claim 6, wherein the rotary disc is subjected to a heat treatment at a temperature of 120 to 150 ℃ for 20 to 40min before the guide bracket is mounted.

8. A method of mounting a helicopter rotating disc bearing and fixed disc as claimed in claim 7, wherein the guide bracket is removed, the fixing mechanism and guide ring are removed, and then locking tabs are mounted on the positioning notches on the upper surface of the inner ring of the rotating disc bearing.