GB/T 28674-2012The technical specifications for remanufacturing of automotive components - Steering gear (English PDF)

4.1 Dismantling

4.1.1

steering gear disassembly should meet the requirements of GB/T 28675.

4.1.2

rack and pinion steering disassembled into. clip, dust cover, tie rod, tubing, adjusting nut, spring, briquetting, valve seal seat, retainer,

Screw cap, lock nut, rack, gear assembly (rack and pinion mechanical steering), housing assembly, valve housing, rotary valve assembly (rack and pinion hydraulic

Power steering) and so on.

Turn the valve assembly can be disassembled into gears, spools, valve sleeve, bearings and seals.

Housing assembly can be disassembled into the shell, seals and bearings.

4.1.3

recycle ball steering gear disassembled into. rocker lock nut, steering arm, steering side cover, rocker shaft, steering front cover, steering screw,

Steering nut, piston, recirculating ball tube clamp, catheter, steel ball and so on.

4.2 classification requirements

Disassembled parts should be classified according to GB/T 28676.

4.3 cleaning requirements

Disassemble the resulting parts should be cleaned according to GB/T 28677 requirements to meet the cleanliness requirements of the product.

5.1 rotary valve assembly

5.1.1

Check shaft seal contact surface and ball bearings, bump, wear or damage should be replaced or repaired the entire rotary valve assembly.

5.1.2

Check bearing contact surface, wear or damage should be replaced.

5.1.3

Crack on the pinion check, pitting, peeling or cracks of the parts should be replaced.

5.1.4

Check the valve valve assembly features, do not meet the requirements of the product drawings should be replaced.

5.2 valve housing

5.2.1

Check the seal ring and seal contact surface, bump, wear or damage should be replaced.

5.2.2

The area of the seal ring can be repaired according to the degree of damage.

5.2.3

Check the thread, thread deformation can be repaired, thread rupture should be replaced.

5.2.4

Check the assembly surface bump, wear and scratches, a slight degree of damage can be repaired, the degree of damage should be replaced.

5.2.5

check the bearing contact surface bump, wear and scratches, a slight degree of damage can be repaired, the degree of damage should be replaced.

5.3 shell and steering booster cylinder

5.3.1

Check the shaft seal contact surface damage, damage should be replaced.

5.3.2

Check the thread, the thread can be used to repair deformation, thread rupture should be replaced.

5.3.3

seal ring contact surface, bump, wear, scratches should be replaced.

5.3.4

Check the piston contact surface, bump, wear, scratches should be replaced.

5.4 rack or steering nut

5.4.1

Crack detection, cracks should be replaced.

5.4.2

Check the thread, thread damage should be replaced.

5.4.3

Check the teeth, a pitting, falling, cracks should be replaced.

5.4.4

check rack or turn nut beating, should be consistent with product drawings requirements.

5.4.5

Check the contact surface pitting, shedding, rust or pits, a slight degree of damage can be polished, serious should be replaced.

5.4.6

Check nut raceway, bump, wear, scratches should be replaced.

5.5 Briquetting or adjusting screw

Check the contact surface, bump, wear, scratches should be replaced.

5.6 Piston guide sleeve

Check the sealing ring contact surface, bump, wear, scratches should be replaced.

5.7 screw raceway

Check the screw raceway, there are indentations, wear, pitting should be replaced.

5.8 tubing

5.8.1

Check the sealing ring contact surface, bump, wear, scratches should be replaced.

5.8.2

Check the thread, thread with rotten teeth, broken should be replaced.

5.9 tie rod

5.9.1

Check the ball without rust, if any should be replaced.

5.9.2

Check whether there is a gap ball, if any should be replaced.

5.9.3

Check the thread and tie rod, damaged should be replaced.

6.1 General requirements

6.1.1

The following new parts should be used.

a) O-ring;

b) Seal;

c) dust cover;

d) Ball.

6.1.2

The following parts are recommended for new parts.

a) tie rod;

b) Ball joint;

c) Tubing.

6.2

Remanufacturing steering assembly assembly shall comply with GB/T 28679 requirements.

6.3

Avoid seal seat and sealing surface damage during assembly.

6.4

Ensure that all seals are greased when assembled.

7.1 Performance Requirements

7.1.1 Performance test

7.1.1.1

Remanufacturing mechanical steering gear shall be subjected to the following performance tests, the test results shall comply with QC/T 29027 requirements.

a) Determination of transmission gap;

b) rack or no-load torque.

7.1.1.2

Remanufactured hydraulic power steering should be carried out the following performance tests, the test results should be consistent with QC/T 530 requirements.

a) Determination of free clearance;

b) Valve characteristics test;

c) internal leak test;

d) external leakage inspection;

e) Rack moving force or idling torque.

7.1.2 Wear test

7.1.2.1

mechanical steering After wear test, no functional abnormalities, no cracks or cracks.

7.1.2.2

hydraulic power steering after abrasion test, no functional abnormalities, no cracks or cracks, no external leakage.

7.1.3 hydraulic assist force steering test

Hydraulic booster force test, no functional abnormalities, no cracks or cracks, no external leakage.

7.2 Test methods

7.2.1 Performance test

7.2.1.1

Remanufactured mechanical steering performance test methods should be consistent with QC/T 29026 requirements.

7.2.1.2

Remanufactured hydraulic power steering performance test methods should be consistent with QC/T 529 requirements.

7.2.2 Wear test

7.2.2.1 Mechanical steering

The assembly is mounted on a test bench, control the load on the steering arm or rack so that the input shaft torque input 30Nm, the input shaft to

20r/min ~ 30r/min speed of rotation, the input shaft angle of not less than 90% of the total turn to complete.20000 cycles.

7.2.2.2 Hydraulic power steering

The assembly is installed on the test bench, the test hydraulic pressure is the maximum working pressure, and the steering arm or rack in the test process to achieve full load,

Input shaft to 20r/min ~ 30r/min rotation speed, the input shaft angle of not less than 90% of the total corner, to complete.20000 cycles.

7.2.3 Hydraulic assist force steering test

The assembly is installed on the test bench, the test pump does not work, turn the input, adjust the output load, the input load

125Nm (output torque 2500Nm, or rack output force 14000N) or 175Nm (output torque > 2500Nm, or rack

Output force > 14000N), complete 10 cycles.

8.1 factory inspection

8.1.1

Each assembly shall be inspected in accordance with 7.1.

8.1.2

According to product technical requirements, the main assembly size inspection.

8.1.3

factory inspection should be consistent with GB/T 28678.

8.2 Type test

One of the following situations should be type tested.

a) Remanufacturing steering gear before mass production;

b) Remanufacturing steering gear to resume production after two years of shutdown;

c) After significant changes in the remanufacturing process.

9.1

Remanufacturing the steering gear should take the necessary measures to prevent dust, rust and prevent other physical damage.

9.2

Identification and packaging should be consistent with GB/T 28678.

9.3

Remanufacturing The steering shall be marked with a remanufactured product mark.