GB/T 3871.20-2015Agricultural tractors—Test procedures—Part 20: Test methods of tractor bumpiness (English PDF)

3.1

tractors bumpy test site should be the hard ground. Specifications and laying obstacles manner, circumferentially specified in Figure A.1 carried out (see

Appendix A). As different experimental farm tractors and radius of gyration illustration, obstructions can increase or decrease, but each obstacle height and arrangement (one-sided

And bilateral) should be the same as illustrated. It should be greater than 1.5 times the distance between the obstacle wheeled tractor wheelbase.

3.2

Measurement ago wheeled tractor, rear axle vibration sensor should be installed before the close, the rear wheel axis and the vertical plane of the longitudinal tractor

The upper portion of said intersection line, close to the axle at; tractor measured vibration sensor should be installed in the upper portion of the outer side of the drive shaft housing.

3.3

Bilateral obstacle, wheeled tractors and tractor front axle drive shaft housing maximum vertical vibration acceleration of 40 2 0m/s2, Wheel

Tractor rear axle maximum vertical vibration acceleration of 25 2 0m/s2. Took 6km/h ~ 7km/h speed can not be achieved, by appropriate

Adjust the tire pressure to achieve.

3.4

tractors shall be tested continuously bumpy, bumpy times no greater than 18kW wheeled tractors and tractor is 5 × 104 times,

The number of bumps wheeled tractors 18kW ~ 36kW of 7 × 104 times. Bumpy times greater than 36kW wheeled tractors for

8 × 104 times. Forward and reverse bumps times each half.

3.5

wheeled tractor bump test, the driver's seat of the mass of the additional weight 65kg ± 1kg (equivalent to 75kg driver assigned

Quality on the seat), front and rear counterweight according to the instructions specified in the configuration state of transport; walking tractor bumps in the test, each of the armrest on the aggravating

Block 2kg.

3.6

When the tractor bumpy test for freedom obstacle, can be equipped with semi-trailers tested, but transferred to the carrier trailer towing point

Netherlands, shall be equal to the load during transport operations.

3.7

tractors per bump 10,000 times, we want to shift maintenance, and inspection of the fitting is tightened, maintenance item in accordance with the instructions provided get on.

3.8

bump test, such as a tractor or a catastrophic failure or fatal fault GB/T 24648.2 specified, the test should be stopped.

4.1

vibrometer set, stopwatch, barometers like.