KR100839183B1 - Thrust bearing product method for pulverizer geared reducer - Google Patents

Abstract

A method of manufacturing a thrust bearing for a pulverizer geared reducer is provided to adjust the thickness of a bearing shim or replace only a pivot without replacing the entire bearing in case of wear of a tilting unit. A method of manufacturing a thrust bearing for a pulverizer geared reducer includes the steps of: selecting material of the thrust bearing; performing primary roughing on the material with a detachable pivot; performing heat treatment and hydrogen removal on a main body and the pivot; performing secondary roughing on the main body and the pivot; performing pre-treatment including solvent cleaning, alkaline cleaning, pickling, and fluxing to clean the main body and the pivot; coating tin on babbitting surfaces of the main body and the pivot; coating babbitt metal on the tinned surface of the main body; performing UT(Ultrasonic Testing) after performing semi-finishing of the main body and the pivot; performing PT(Liquid Penetrant Examination) after performing finishing of the main body and the pivot; and performing anti-corrosion treatment after performing a dimension test on the completed thrust bearing.

Description

Thrust bearing product method for pulverizer geared reducer

This application is a divided application of Korean Patent Application No. 10-2007-0106835, filed on October 23, 2007, which relates to a method of manufacturing a thrust bearing for a differential gear reducer in more detail. The present invention relates to a method of manufacturing a thrust bearing for a differential gear reducer that localizes a thrust bearing so as to greatly shorten a product maintenance and supply period when a bearing is damaged, and a thrust bearing for a differential gear reducer manufactured by the method.

Currently, thrust bearings, which are the main parts of the differential gear reducer, are currently manufactured by Renk Tacke, Germany. As a result, when the bearing is damaged, not only the maintenance period is required for a long time, but also a problem such as the outflow of foreign currency due to import is occurring.

In addition, this reality is not contributing to the development of technology of domestic companies, and when a failure occurs, it takes a long time to procure parts and maintenance period, which is a serious obstacle in securing facility stability.

The present invention has been made to solve the above problems, and an object of the present invention is to localize the thrust bearing so that the product maintenance and supply period can be significantly shortened when the thrust bearing of the pulverizer reducer, which is dependent on total import, is damaged. It is to provide a method of manufacturing a thrust bearing.

Another object of the present invention is to equip the thrust bearing with a detachable pivot in the thrust bearing so that the bearing can be simply compensated by the bearing seam or replaced only by disassembling the pivot without remanufacturing and replacing the whole bearing when the tilting part of the thrust bearing is worn. To provide a thrust bearing.

In order to achieve the above object, the present invention provides a method for manufacturing a thrust bearing, comprising the first step of selecting the material of the thrust bearing and the first roughing of the material with a pivot that can be detached and attached after the first step The second step of first manufacturing the thrust bearing body 1 and the pivot 2 by machining, and dewatering by heat treatment of the thrust bearing body 1 and the pivot 2 first manufactured by the first rough processing of the second step. A third step of extinguishing, a fourth step of roughing the dehydrogenated thrust bearing body 1 and the pivot 2 through the third step, and a second roughing thrust bearing body 1 and Fifth step of performing pretreatment process including solvent cleaning, alkaline cleaning, pickling process and fluxing process to clean pivot 2 And, the pretreatment process of the fifth step On the batting surface of the thrust bearing main body 1 in which the thrust bearing body 1 and the pivot 2 are tinned to the beating surface, and a sixth step of performing a tinning process is performed. The seventh step of performing the Babbitt metal coating process, and the eighth step of performing the UT inspection after grinding the thrust bearing main body (1) and the pivot (2) in which the seventh step of the Baviting process is completed And a thrust bearing in which the pivot 2 is assembled by assembling the pivot 2 through the pivot assembly bolt 4 with the bearing shim 3 interposed in the thrust bearing body 1 in which the eighth step is completed. After manufacturing, after the ninth step of finishing and performing the PT inspection, and performing a dimensional inspection for the thrust bearing of the ninth step is completed, characterized in that it comprises a tenth step of performing rust prevention with TECTYL506 material.

In the present invention, the seventh step of the beating process is characterized in that it comprises a step of gravity casting the molten Babbitt metal to the beating surface of the thrust bearing body (1).

In addition, the present invention provides a thrust bearing for the differentiator reducer manufactured by the manufacturing method for the differentiator reducer.

In the present invention, the thrust bearing for the differential gear reducer can be corrected by adjusting the thickness of the bearing shim 3 disposed on the bottom surface of the pivot 2 when the pivot 2 provided in the thrust bearing is worn. And, if the wear is severe, characterized in that only the pivot (2) can be disassembled and replaced.

According to the present invention, when the thrust bearings are damaged by localizing the thrust bearings used in the differential gear reducer, which depended on the total amount of imports, it is possible to reliably shorten the product maintenance and supply periods and secure the equipment stability. In addition, it is possible to prevent the outflow of foreign currency due to total imports and contribute to the improvement of domestic technology.

In addition, the thrust bearing manufactured by the manufacturing method according to the present invention is more excellent in durability and wear resistance than the conventional thrust bearing.

In addition, the thrust bearing according to the present invention has a pivot which can be attached and detached, and when the tilting part of the thrust bearing is worn, the thrust bearing can be simply compensated by the bearing seam or replaced by only disassembling the pivot without remanufacturing and replacing the entire bearing. And the maintenance time can be reduced very effectively.

Hereinafter, with reference to the accompanying drawings will be described in detail a method of manufacturing a thrust bearing for a differential gear reducer according to the present invention.

First, the manufacturing method of the thrust bearing for the differential gear reducer of the present invention will be described with reference to FIG.

Chemical and mechanical analyzes were carried out on the base material specifications and components of thrust pad bearings (Rcnk Tacke), and Table 1 shows a sample analysis of the white metal used for thrust pad bearings (manufactured by Rcnk Tacke). 2 shows the sample analysis of the back metal, and Table 3 shows the impact test and mechanical property analysis values, respectively.

<Step 1: Select creatives>

In the present invention, white metal, which is a similar material in Korea, was selected as WM-2 type and back metal was SS400.

The ranges to consider when choosing a base metal are as follows.

1) Forge / purchase (import) the material according to the approved MPP & production drawing.

2) Forging refers to a processing method in which a product is made by heating a metal to a suitable temperature and pressing and molding it to a given shape and dimension. Forged parts are more reliable than tissue castings because they are more reliable in structure and mechanical properties. Annealing the metal results in finer and more uniform tissues and better mechanical properties.

3) The weight of the material to be purchased is calculated in consideration of scale loss, fin fin, processing margin and fixed margin by heating.

4) Oxidation loss of heating furnace is small, followed by salt bath, electric resistance furnace, gas furnace, heavy oil furnace, coal furnace and so on.

5) When the forging is simple, use the same material as the shape of the forging to speed up the forging. In addition, a material slightly larger than the maximum cross section of the forging is used.

6) Steelmaking

Ingots shall be made using Killed Steel Ingots that have been steelmaking and refined in a basic electric furnace.

7) forging

        A) Forging work should be performed in hot state by using press or hammer, etc., and have forging ratio of 3S or more.

       B) Because of the high possibility of cracking after forging, it should be turned over immediately.

         C) Air cooling is prohibited below 300 ℃.

         D) heat treatment

             NORMALIZING 850 ~ 950 ℃ (AIM 890 ℃) × 1HR / 50mm A.C

As this material inspection

1) Base metal material inspection

  A) After heat treatment, rough processing, sample shall be taken, and then a test of chemical composition and mechanical (physical) properties shall be made to a certified national institution. The results are strictly limited to the criterion.

  B) Judgment criteria

Complies with MPP and KS-D-3503-SS400.

T.S (n / mm2) Y.S (n / ㎡) E.L (%) HB MIN 410 MIN 265 MIN 38 109 ~ 156

C Mn P impurities 0.15 to 0.20 1.45-1.25 0.10 to 0.35 MAX 0.03 MAX 0.035

2) Non-Destructive Examination (NDE) before BABBITT

      After roughing the purchaser, perform the front surface of the base metal according to the production drawing or MPP.

3) NDE (MT: Magnetic Particle Testing) before BABBITT

        MT is performed on the BABBITT surface of the base metal.

        (Applied SPEC: P3C-AL-0003)

After selecting and inspecting the material, how to make and work

From the purchase of the material, the material can be removed, material inspection, heat treatment, pre-casting, material inspection, pretreatment process, roughing after gravity casting, UT inspection, medium cutting and hole machining, finishing, PT check, and final inspection. In addition, as a more specific flow chart, the original manufacturing process of the thrust pad bearing (Thrust Pad BRG) of the present invention is a material purchase → heat treatment (normalizing) → primary rough machining → material UT (Ultrasonic testing) → heat treatment ( Dehydrogenation) → Machining before BABBITTING [Pretreatment Process] → MT (BABBITTING Side) → BABITING → Primary Machining → UT (White Metal) → Secondary Machining → Finishing → Liquid Penetrant Examination , Liquid penetrant inspection) → stamping → inspection (VISUAL & PT) → CONTACT CHECK → antirust and packaging.

<Stage 2: First Rough Cutting>

: This process is the first process of roughing the base metal of thrust bearing to manufacture the thrust bearing main body 1 and the pivot (2). Also, it is a roughing process for heat treatment. It should contain 5mm (per side) of all processing margins.

<3rd stage: HEAT TREATMENT for HYDROGEN REMOVAL>

: This process is a process performed to remove the hydrogen contained in the thrust bearing body 1 and the pivot 2 first manufactured by the first rough machining of the second stage.

A) Scope of application: All Babbit Bearings (BABBITT BRG ')

B) heat treatment curve

         : Heat treatment according to the graph below, but DMB-QIP-21 should be applied when not mentioned.

<4th step: 2nd roughing operation [finishing before BABBITTING]>

This process is to perform roughing process on the thrust bearing main body 1 and the pivot 2 from which hydrogen was removed through the said 3rd step, and this process is a process for performing BABBITTING. This affects the bonding strength and the workability of subsequent processes.

A) The inner and outer diameter concentricity should be within Φ0.05mm during processing.

B) In order to improve degreasing and adhesive strength, follow-up process should be promptly performed after roughing. If unavoidable, the oil must be rust prevented using gear oil or hydraulic oil.

C) Work by suppressing the use of cutting oil if possible.

-Sample Collection and Report

  The chemical composition (%) of the white metal is shown in the table below.

  Sn: cup part Pb: Max. 0.50 Al: Max. 0.01   Sb: 8.0-10.0 Bi: Max. 0.08 Zn: Max. 0.01   Cu: 5.0 ~ 6.0 Fe: Max. 0.08 As; Max. 0.10

Ingot production of white metal (WM-2)

A) It is manufactured in a crucible or pot furnace (POT FURNACE).

B) Manufacture to prevent dust or foreign matter from entering.

C) Specimen collection: Collect specimens at the completion of injection for each lot in manufacturing INGOT.

D) Specimen size: 25mm × 25mm × 14mm

E) inspection

    Iii) Chemical Composition: The Chemical Composition Chart should be satisfied.

    Ii) Visual inspection: The surface should be clean and free of scratches and holes.

F) determination and use of the product;

    After collecting the specimen, conduct a component analysis test by requesting a nationally certified institution, and maintain the test report. If the result of the component analysis is unsatisfactory, remove the BABBITT, and then rebate it.

<Step 5: CLEANING>

This step is a pretreatment step before casting, and is a step of cleaning and washing the second rough machining thrust bearing body 1 and the pivot 2. Dimensional inspections are to be carried out on the inner and outer surfaces of the bearing before pretreatment to check for cracks and deformation. For cleaning, it should be possible to continuously supply clean water up to 60 ° C.

This process largely includes solvent cleaning, alkaline cleaning, pickling process, and fluxing process.

(1) SOLVENT CLEANING: Thoroughly remove the oil (oil and grease) by wiping with solvent and clean paper towel, and there should be no stain on thrust bearing.

(2) ALKALINE CLEANING & WATER RINSE

    ① Preparation of Alkaline Solution

           224 g (8 ounces) of chemical can be used to make 3.8 liters (1 gallon) of solution. The solution weighs about 107 kg (431 gallons).

            * Available drugs

                Okaite No.20

                Kemtex No.43

                Enthone No.S-61

           ② Fill the tank with 180 gallons of water.

          ③ Slowly dissolve the appropriate alkaline chemicals using a fine wire mesh basket. Do not put it all at once because there is a risk of explosion.

           ④ Add water to the top of the tank 200mm.

           ⑤ Maintain temperature 72 ~ 100 ℃ (160 ~ 212 ℃) during operation.

         A) Soak bearing in alkaline solution at 70 ~ 100 ℃ to remove oil. At this time, hang the bearing in the tank and move around to maintain 4 ~ 5 minutes. If there is rust and foreign matter that cannot be removed, the foreign matter should be completely removed by brush.

         B) Remove from alkaline tank and immerse in RINSE TANK as soon as possible. Remove light colored stains on the surface using water pressure of WATER HOSE, and then immerse it in alkaline tank again.

         C) Wash the alkaline tank for 3 ~ 5 minutes until the stain is completely removed, then remove it and rinse it again. In the flowing water, there should be no beading phenomenon on the surface, there should be no uneven stain on the surface, and after the work is finished, remove the surface moisture with compressed air.

(3) PICKLING (ACID CLEAN, acid wash)

   The copper material should not be acid-cleaned, but the area to be babbit should have a certain color.

   A) Preparation of Acid Wash Solution

            The chemicals use 20Baume hydrochloric acid solution (GE MATERIAL D4A3D) and 0.87-1kg (32-36.5 ounces) of chemical to make 3.8 liter (1 gallon) of solution.

             ① Fill the tank with 270 gallons of water.

             ② Add 118 gallons of hydrochloric acid.

             ③ Fill water up to 200mm from the tank TOP.

             ④ Keep the temperature at 38 ~ 54 ℃ (100 ~ 130 ℉) during operation.

         B) After acid cleaning, immerse in RINSE TANK as soon as possible (within 30 seconds).

WATER RINSE

         A) Soak in water to remove hydrochloric acid deposit and make it light gray.

      B) Finish the rinsing as soon as possible and immediately (within 15 seconds) soak it in the Flux COMPOUN to prevent oxidation.

         C) The surface should be cleaned by soaking in hydrochloric acid solution for up to 4 minutes (2 ~ 4 minutes).

(4) FLUXING

  A) Soak it in the flux tank for about 4 minutes (2 ~ 4) and shake it with your hands. You should shake it out when you take it out. If there is a foreign object on the bearing, continue until you are satisfied with the results.

         B) The surface should be soaked in the tin pot as soon as possible (1 minute) before it dries.

          -Manufacturing of FLUX (ingredients) WATER RINSE

           A) Immersion FLUX

              Maintain 37-49 ° C (100-120 ° F) during operation.

               * Zinc Chloride ---------- 50% aqueous solution 186 gallon (1,238 lbs)

               Ammonium Chloride --------- 122 lbs

               * Water ---------------- 200gallon

           B) In case of spraying FLUX

               * Zinc Chloride -------------- 1,120g (40onces)

               * Ammonium Chloride ------------ 0.5lbs

               * Water -------------------- 1quart

<Step 6: Tinning Process>

This process is a process of tinning the thrust bearing main body 1 and the pivot 2 which performed the pretreatment process of the said 5th step. Good adhesion of metal (BABBITT METAL).

A) Chemical composition and material

Pure tin (ASTM-B339 (GE MATERIAL B10E3A)) is used in this process and its chemical composition is as follows.

  Sn: 99.8 Bi: Max. 0.015   S: Max. 0.003   Sb: Max. 0.04 Fe: Max. 0.015   Co + Ni: Max. 0.015   Cu: Max. 0.03 As: Max. 0.04   Other Zn, Cd, Al: Max. 0.001   Pb: Max. 0.05 Ag: Max. 0.01

B) Furnace tinning copper (COPPER) and furnace tinning iron (IRON METAL) must be used separately.

C) Before tinning, BABBITT'G must be masked with paint or chalk, and all holes are blocked with asbestos or plaster.

D) Immediately after fluxing, immerse the bearing in the molten tin bath maintained at 300 ~ 320 ℃ while it is wet (within about 4 minutes).

E) The surface to be babbit (bavitting surface) should be uniformly tinned. When immersing in the tin pot, make sure that the upper half is up and shake it slightly while the bearing is soaked so that no gas such as AIR remains.

F) After a certain period of time (more than 5 minutes: there is a slight difference depending on the size of the product), remove the impurities on the top and let the bearing part come out, measure the temperature of the bearing metal and take it out if the temperature is as below. At this time, the temperature is immersed in the tin bath again for 1 minute after the temperature measurement to eliminate the deviation of the temperature.

        * THRUST BEARING: 305 ± 5 ℃

        * JOURNAL BEARING

          ① When inner diameter is over φ350: 230 ~ 270 ℃

          ② When the inner diameter is less than φ350: 280 ℃ or more

G) The minimum immersion time should be such that the minimum thickness of the CuSn of the bonding part in the case of copper is not less than 0.005mm.

A) Bearings should be tinned evenly on the front surface. After removing it from the tin bath, place it in the place where you want to babbit and fix it so that the bearing does not move and prepare the coolant.

I) Prepare molten BABBIT on the bearing and remove the flux residue and other debris with a clean paper towel. If necessary, a clean brush (BRUSH) should be used to remove surface residues and oxidizing surface layers. At this time, it should not be heavily wiped to remove tin.

B) BABBITTING Flux again After spraying the fine vapor-shaped flux on the site to be made, no more than 8 minutes must pass before injection of BABBITT. Thrust (thrust bearing: 305 ± 5 ° C) is to be maintained.

<Step 7: BABBITTING Process>

This process is a process of applying a babbitt metal (bbit) to the thrust bearing body 1 and the pivot (2) in which the sixth step of the tinning process is completed, the babbit metal is the white metal ( WM-2). The proper RPM and cooling speed of the Babbit Machine is an important variable in the performance of the product.

A) All journal bearings except thrust bearings should be bebbed by centrifugal casting. The thrust bearing of this invention uses the gravity casting method.

B) For the betting operation, the bearings must be preheated, and the temperature is as follows (in the case of journal bearings).

         ① Radial thickness of 350mm or more: 240 ~ 250 ℃

         ② Radial thickness less than 350mm: 280 ~ 300 ℃

C) All JIGs that come into contact with BABBIT solution, including ladles, should be preheated to a temperature of 420 ~ 440 ℃ to prevent cooling and seizure during injection.

D) Pour the molten metal while turning the 4bit-448 ℃ Babbitt molten metal to 200 ° ~ 270 ° along the bearing circumference. At this time, pour the BABBIT as quickly as possible to form a certain thickness of BABIT. When working, pay attention to local heating, and do injection work carefully so that melt does not splash around.

WATER SPRAYING COOLING

  A) After the penetration process, it should be cooled by using coolant. At this time, the setting speed should be adjusted to take care of peeling, shrinking and bubble generation of BABBIT alloy.

        B) Start cooling 30 seconds after the end of penetration and continue until solidification, but bearing temperature should not drop below 150 ± 10 ℃.

AIR COOLING

         When the outside diameter reaches 125 ~ 150 ℃, cooling starts in the air. The cooling time should be equal to the water cooling time. If the bearings are too small to bet on the cooling platform, it can be placed on a steel chill plate and immersed in water. Before dipping, the bavit must be molten with an oxygen ethylene torch for about 2 minutes.

-Gravity casting of bearings

The seventh step of the beating process includes a process of gravity casting the molten Babbitt metal on the batting surface (casting surface) of the thrust bearing body 1.

The casting must be applied according to the DMB-QIP09-12 procedure.

<Step 8: Medium Cutting and UT Inspection>

After thrusting the thrust bearing body 1 and the pivot 2 in which the seventh step of the betting process is completed, the UT inspection is performed.

(1) first intermediate cutting

Roughing is performed on the BABBIT part (inner diameter part), leaving 4 mm per side. Inner and outer diameter concentricity should be within Φ0.1mm.

(2) Nondestructive testing (U.T)

         In accordance with ISO 4386-3, the UT inspection is carried out in accordance with paragraphs 5-6 for BABBIT parts.

(3) secondary medium cutting

      TURNING shall be carried out with the inner and outer diameters and thickness of 2mm left per plane according to the applied drawings.

-Fostering BABBITT DAM

Only for products requiring BABBITT DAM [LINER & ELLIPTICAL BEARING]. Perform welding or local betting according to DMB-QIP09-13.

<Step 9: Finishing and PT Inspection>

The thrust bearing is assembled with the pivot 2 by assembling the pivot 2 through the pivot assembly bolt 4 with the bearing shim 3 interposed in the thrust bearing body 1 having the eighth step completed. After finishing, finishing and performing PT inspection. Attention is to be paid to deformation and roughness due to frictional heat during finishing.

Further, in the present invention, the bearing shim 3 is manufactured through a separate process, and then assembled to the thrust bearing body 1 before the ninth step of finishing, and detachable from the thrust bearing body 1. The thrust bearing with the pivot 2 is manufactured.

Nondestructive Testing (P.T)

P.T is carried out on the entire area of BABBITT according to ISO 5386-1 according to paragraph 5-5. If defects are found, correction welding is performed according to DMB-QIP09-13.

<Step 10: Dimensional Inspection and Rust Prevention>

After the dimensional inspection is performed on the thrust bearings having completed the ninth step, the rust prevention is performed.

(1) Dimensional Inspection (VISUAL & DIMENSIONAL)

  A) Dimensional inspection shall be carried out according to the application drawings and the dimensional inspection report (including the status of DAMAGE).

   B) Perform visual and visual inspection.

   C) If necessary, measure the roughness of the BABBITT part using an illuminometer and correct it using sandpaper, etc. if it is not satisfied.

(2) antirust

  A) The rust prevention is based on long-term rust prevention and can be changed according to circumstances.

  B) Clean the product by using solvent which does not contain acetone and remove all fingerprints.

  C) After drying the product well, apply TECTYL506 to all parts except BABBITT side and dry it.

Next, the thrust bearing for the differentiator reducer of the present invention manufactured by the manufacturing method of the thrust bearing for the differentiator reducer according to the present invention will be described.

Figure 2 is a view showing the thrust bearing of the present invention, as shown, when the pivot (2) provided on the main body (1) of the thrust bearing of the present invention, when worn, primarily the bottom surface of the pivot (2) It can correct by adjusting the thickness of the bearing shim 3 arrange | positioned at. For example, when the pivot 2 is worn, the thickness of the bearing shim 3 can be changed from 0.1t to 0.2t. In addition, when the wear of the pivot 2 is severe, only the pivot 2 itself may be replaced by loosening and disassembling the pivot assembly bolt 4.

As described above, the preferred embodiment according to the present invention has been described, but the present invention is not limited to the above-described embodiment, and the present invention is not limited to the scope of the present invention as claimed in the following claims. Anyone with knowledge will have the technical spirit of the present invention to the extent that various modifications can be made.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a block diagram showing a manufacturing method of a thrust bearing for a differential gear reducer according to the present invention.

2 is a partial configuration of the thrust bearing for the differential gear reducer according to the present invention.

3 is a plan view and a cross-sectional view taken along line B-B showing a pivot of a thrust bearing for a differential gear reducer according to the present invention.

4 is a plan view of a bearing shim of a thrust bearing for a differential gear reducer according to the present invention, and a front view and a plan view of a bolt for pivot assembly;

Brief description of the reference numbers

1: thrust bearing body 2: pivot

3: bearing shim 4: pivot assembly bolt

5: thermometer hole 6: key

Claims (2)

In the manufacturing method of the thrust bearing, First step of selecting the material of the thrust bearing; And A second step of roughing the material first by providing a pivot to attach and detach the material after the first step; and A third step of dehydrogenation by heat-treating the thrust bearing body 1 and the pivot 2 originally manufactured by the second roughing operation; and A fourth step of roughing the dehydrogenated thrust bearing body 1 and the pivot 2 through the third step; and Solvent cleaning, alkaline cleaning, pickling process and fluxing process to clean the secondary roughened thrust bearing body 1 and pivot 2 A fifth step of performing a pretreatment process comprising a; and A sixth step of performing a tinning process of tinning the thrust bearing body 1 and the pivot 2 having the pre-treatment step of the fifth step to the beating surface; and A seventh step of performing a baviting process of coating a babbitt metal on the batting surface of the thrust bearing body 1 in which the sixth step of the tinning process is completed; An eighth step of subjecting the thrust bearing body 1 and the pivot 2 to which the seventh step of the betting process is completed, and then performing UT inspection; and After the eighth step is completed, the ninth step of finishing and performing a PT inspection; and A tenth step of performing dimensional inspection on the thrust bearing of which the ninth step is completed, and then performing rust prevention with TECTYL506 material; A method of manufacturing a thrust bearing for a pulverizer reducer, comprising: The method of claim 1, The seventh step of the beating process is a manufacturing method of the thrust bearing for the differential gear reducer characterized in that it comprises the step of gravity casting the molten Babbitt metal on the beating surface of the thrust bearing body (1).

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