The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 24, 1982
Filed:
Sep. 11, 1979
Kei Nakasu, Toyota, JP;
Toyota Jidosha Kogyo Kabushiki Kaisha, Aichi, JP;
Abstract
An alarm device for a brake clearance limit in an air-over-hydraulic brake system wherein air pressure piston drives a hydraulic piston for producing braking hydraulic pressure in a hydraulic brake system, capable of giving a warning at a certain constant brake clearance, irrespective of the height of pressure in the hydraulic brake system. The device comprises a sensor of hydraulic pressure for detecting a hydraulic pressure P in the hydraulic brake system, a sensor of shift amount l of the air-pressure piston after the moment when the permissible limit of brake clearance has been reached and all of the gaps in the hydraulic brake system have been lost, and a warning element which gives a warning signal when a formula l>.alpha..multidot.P is satisfied, wherein .alpha. designates rigidity coefficient of the hydraulic brake system, i.e., a quotient of the increased shift amount of the hydraulic piston divided by the increased amount of the hydraulic pressure. It is not, in this invented device, at a moment when the air pressure piston has been moved to a fixedly set position but at a moment when the same piston has been moved to a position where a shift amount corresponding to elastic deformation of the hydraulic brake system has been automatically compensated, that the warning signal is given.