Master cylinder fast fill valving mechanism with ramp

A master cylinder, comprising a master cylinder housing with a bore extending axially therein, a reservoir providing fluid for said bore, an end of said housing having a bearing member attached thereto and retaining a sleeve member within said bore, a pair of pistons associated with said master cylinder housing, one end of one of said pistons having a fast fill mechanism disposed thereat, the fast fill mechanism comprising a seal support having a ramp thereon, fast fill sealing means disposed at said one end of the piston, and a complementary-shaped ramp disposed at the one end of said one piston, movement of said one piston effecting increased pressure within an associated pressure chamber of said master cylinder and causing said seal support and fast fill sealing means to be urged toward an end of said bearing member so that the ramp on the seal support is biased against the ramp at the one end, the ramps disengaging resiliently from one another at a predetermined pressure such that the fast fill sealing means and seal support are displaced away from the one end of the one piston and allow pressure within said chamber to be communicated past said fast fill sealing means.

A master cylinder, comprising a master cylinder housing with a bore extending axially therein, a reservoir providing fluid for said bore, a pair of pistons associated with said master cylinder housing, one end of one of said pistons having a fast fill mechanism disposed thereat, characterized in that the fast fill mechanism comprises a seal support having a ramp thereon, fast fill sealing means disposed at said one end of the one piston, and a complementary-shaped ramp disposed at the one end of said one piston, movement of said one piston effecting increased pressure within an associated pressure chamber of said master cylinder and causing said seal support and fast fill sealing means to be displaced so that the ramp on the seal support is biased against the ramp at the one end, the ramps disengaging resiliently from one another at a predetermined pressure such that the fast fill sealing means and seal support are displaced away from the end of the one piston and allow pressure within said chamber to be communicated past said fast fill sealing means.

A master cylinder, comprising a master cylinder housing with a bore extending axially therein, a reservoir providing fluid for said bore, a pair of pistons associated with said master cylinder housing, one of said pistons having a fast fill mechanism disposed thereat, the fast fill mechanism including means for reducing an input master cylinder actuation force after a predetermined fast fill pressure is attained in an associated pressure chamber, the reducing means including a resilient mechanism which permits the fast fill mechanism to be displaceably actuated toward an exterior end of the one piston by the predetermined fast fill pressure so that the fast fill pressure is relieved smoothly and deteriorates substantially, and the fast fill mechanism continuing to be displaceably actuated toward the exterior end of the one piston after the predetermined fast fill pressure has deteriorated and while the one piston is returning towrad an at-rest position.