DEVICE FOR AUTOMATIC ADJUSTMENT OF CLEARANCE BETWEEN DRUM AND BRAKE PADS (VERSIONS) Russian patent published in 2019 - IPC F16D65/40 F16D65/52 

FIELD: motor vehicle industry.

SUBSTANCE: group of inventions relates to automotive industry and is intended to compensate for wear of brake pads of drum brakes. Device for automatic adjustment of clearance between drum and brake pads on shoes connected by coupling spring includes wheel cylinder, pistons, adjustment assembly and friction bushing. According to the first version, the bushing is made of helical coil spring tight winding with cross-section of turns in the form of circular segments and internal cylindrical surface, pressed with guaranteed tightness on the piston, with possibility of multiple axial movement with preset force relative to the piston, wherein tightening spring by one end is fixed on brake shoe, and by another one – on wheel cylinder body. According to the second version, the bushing is made of helical coil spring tight winding with cross-section of turns in the form of rectangle and inner cylindrical surface is pressed with guaranteed tightness on the piston with possibility of multiple axial movement with preset force relative to the piston, wherein tightening spring by one end is fixed on brake shoe, and by another one – on wheel cylinder body.

EFFECT: higher reliability and safety of brakes operation.

2 cl, 4 dwg