Patent ID: 7651174
Filing Date: 2010-01-26
Classification: B60T

Abstract:
1. Pressure limiting device for a hydraulic braking circuit of a vehicle, the device comprising: a leaktight housing having a bore, a first channel connected to the bore and hydraulically connected with braking components of a front wheel or wheels, and a second channel connected with the bore and hydraulically connected with braking components of a back wheel or wheels; a hollow cylindrical body having a piston head at each end defining with the housing bore an annular chamber therebetween, the cylindrical body mounted for sliding in a sealed manner in the bore, and said cylindrical body having a coaxial bore; an aperture in the cylindrical body wherein the coaxial bore of the cylindrical body is in fluid communication with the annular chamber; a ball positioned in the coaxial bore of the cylindrical body, the ball biased by a spring into contact with a ball seat having an aperture in fluid communication with the housing bore; a closure component positioned in a distal end of the bore of the housing, the closure component having a finger projection positioned to penetrate the ball seat aperture and contact the spring-biased ball; and an elastic component positioned in a proximal end of the bore of the housing and adapted to bias the position of the cylindrical body against the closure component based upon a set pressure value whereby the finger projection contacts and deflects the ball thereby exposing the ball seat aperture and allowing fluid from the first channel and the braking components of the front wheel to communicate with the second channel and the braking components of the back wheel or wheels; wherein, when a pressure of a fluid from the braking components of the front wheels exceeds the set pressure value, the cylindrical body deflects away from the closure component and the finger projection allowing the ball to seat in the ball seat and obstruct fluid flow from the first channel and the braking components of the front wheel to the second channel and the braking components of the back wheel or wheels, thereby limiting fluid pressure to the braking components of the back wheel or wheels.