The invention belongs to the field of automobile
brake testing, and relates to an opposed
piston brake caliper
assembly'return
stroke and clearance 'performance testing method and device, and the method comprises the steps: S1, full-
stroke lubrication: carrying out the pressurization under the condition of no
brake block, and carrying out the
pressure reduction so as to completely push a
piston back to the bottom of a cylinder hole; s2, simulating the position of the
piston in a new product gap; s3, zero setting of the displacement sensor: determining the initial
hydraulic pressure and performing zero setting according to the initial
hydraulic pressure; s4, testing the return
stroke and the clearance: applying 1 MPa of gradually rising pressure to the brake caliper, releasing the pressure, keeping the pressure for 120 seconds, sequentially testing the pressure of 3 MPa, 5 MPa, 7 MPa, 9 MPa and 11 MPa until 15 MPa, and testing each pressure twice; s5, measuring and recording
relative displacement between the piston and the shell under each pressure; and S6, analyzing the output data, and performing
data processing. A
test object of the method comprises a friction block mode and a steel block mode. The device is composed of a pressurization adjusting
system, a clamping alignment unit and a
test data analysis
system. The testing of the return stroke and the gap of the fixed card has great significance in analyzing and reducing dragging, matching liquid demand and other key performances.