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Self-adjusting clutch assembly for a service brake - Mechanical system to keep running clearance constant regardless of the wear of the friction material

IP.com Disclosure Number: IPCOM000244854D
Publication Date: 2016-Jan-22
Document File: 4 page(s) / 234K

Publishing Venue

The IP.com Prior Art Database

Abstract

Wear is a concern in big multi-disc wet brakes used in big equipment. As wear on the friction surfaces increases, piston travel will increase as well, which means the system has to be capable of supplying a big amount of oil to the pressure chamber in order to maintain the braking performance throughout the life of the of the brakes.

That means typically, that we will need to use a powered brake valve instead of a master or boosted master cylinder, which is more expensive and provides less pedal feel to the operator. Further disadvantages of a system with too much piston travel is the bigger space claim and the weight compared to a system with less piston travel.

The self-adjusting system consists of a bushing press-fitted through the backing plate, with a certain length that will assure that we only have a certain displacement (equal to desired) piston travel, or running clearance, since it will only be able to move between two reference surfaces dimensionally controlled.

More details are depicted within the following pictures and description.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 61% of the total text.

Page 01 of 4

      Self-adjusting clutch assembly for a service brake - Mechanical system to keep running clearance constant regardless of the wear of the friction material

Wear is a concern in big multi-disc wet brakes used in big equipment. As wear on the friction surfaces increases, piston travel will increase as well, which means the system has to be capable of supplying a big amount of oil to the pressure chamber in order to maintain the braking performance throughout the life of the of the brakes.

That means typically, that we will need to use a powered brake valve instead of a master or boosted master cylinder, which is more expensive and provides less pedal feel to the operator. Further disadvantages of a system with too much piston travel is the bigger space claim and the weight compared to a system with less piston travel.

The self-adjusting system consists of a bushing press-fitted through the backing plate, with a certain length that will assure that we only have a certain displacement (equal to desired) piston travel, or running clearance, since it will only be able to move between two reference surfaces dimensionally controlled.

More details are depicted within the following pictures and description:


Page 02 of 4

Self-adjusting service brake

The self-adjusting service brake is provided with a 4 disks clutch assembly, having a 0.325 mm disk face/spacer gap. The piston travel is about 2.6 mm nominal (±0.15 mm) with a piston size of Ø200 x Ø150 mm. The required oil v...