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US 5,161,650 AGranted
Disc brake with powered integral parking mechanism
AssigneeAllied-Signal Inc.
InventorAlistair G. Taig
Life of this patent
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AssigneeAllied-Signal Inc.
InventorAlistair G. Taig
Estimating the term…
The disc brake (10, 106, 108, 206) with powered integral parking mechanism comprises a twin piston disc brake (106, 108, 206) having a screw member (22, 24; 122, 124; 222, 224) and nut (28, 29; 228, 229) adjuster mechanism. The twin pistons (16, 18; 216, 218) receive service braking hydraulic pressure to effect a service braking application, and also may be displaced mechanically for a parking application by way of the rack (80, 180) and pinion (47, 48; 247, 248) parking mechanism that is operated by hydraulic pressure. The rack (80, 180) and pinion (47, 48; 247, 248) parking mechanism may be located within the caliper housing (20, 220) such that the rack (80) extends between respective drive pinions (47, 48) located about the screw members (22, 24) in order to effect rotation of the screw members (22, 24) in opposite directions, or the rack (280) may extend longitudinally across the same side of both drive pinions (247, 248) to effect rotation of the drive pinions ( 247, 148) and associated screw members (222, 224) in the same direction of rotation. The drive pinions (47, 48; 247, 248) have ratchet teeth (49) which engage corresponding ratchet teeth (39) on screw member flanges (32, 34) such that during release the height (B) of a flange ratchet tooth (39) determines the running clearance of the disc brake pads.
A disc brake having a powered parking mechanism, comprising a brake housing with a bore having a piston located therein, the brake housing able to receive fluid pressure within said bore in order to displace said piston against an associated brake pad for service braking, and a powered parking mechanism for effecting displacement of said piston for a parking application, the parking mechanism comprising a screw member having a radially extending screw member flange and threads at one end of the screw member, a nut disposed about said threads and engaging said piston, a drive pinion disposed about an opposite end of said screw member and having ratchet teeth on one face thereof, the screw member flange having on one face ratchet teeth which oppose said ratchet teeth of the drive pinion, and a rack member disposed within said housing and having teeth which engage said drive pinion, the rack member movable longitudinally in opposite directions by means of hydraulic pressure, so that hydraulic pressure received by the rack member displaces the rack member to effect rotation of the drive pinion and a corresponding rotation of the screw member flange and screw member by means of engagement between the ratchet teeth, the rotation of the screw member causing the nut to translate along the screw member and displace the piston against the brake pad to effect said parking application.
A disc brake having a powered braking mechanism that displaces a brake pad, comprising a brake housing with a bore having a piston located therein, and said powered braking mechanism for effecting displacement of said piston and brake pad for a braking application, the braking mechanism comprising a powered rack engaging a pinion, and means comprising screw member means rotatable by said pinion and having a nut disposed thereabout to be in engagement with said piston, such that displacement of said rack effects rotation of the pinion and operation of the screw member means so that the nut displaces the piston and brake pad to effect the braking application.
A disc brake having a powered parking mechanism and in combination with a brake circuit, comprising a brake housing with a bore having a piston located therein, and the powered parking mechanism for effecting displacement of said piston for a parking application, the parking mechanism comprising a powered rack engaging a pinion, and means comprising a screw member means rotatable by said pinion and having a nut disposed thereabout to be in engagement with said piston, such that displacement of said rack effects rotation of the pinion and operation of the screw member means so that the nut displaces the piston, and, the brake circuit connected with said disc brake, the brake circuit comprising pressure application means for effecting a service brake application, valve means operable to effect a hydraulic pressure application and release of the said piston for a parking application, and means for generating fluid pressure for said parking application.
A disc brake having a powered braking mechanism that displaces a brake pad, comprising a brake housing with a bore having located therein a piston comprising nut means and said powered braking mechanism for effecting displacement of said piston and brake pad for a braking application, said braking mechanism comprising a powered rack engaging a pinion, and means comprising screw member means rotatable by said pinion to effect displacement of said piston by way of said nut means, such that displacement of said rack effects rotation of the pinion and operation of the screw member means to displace the piston and brake pad and effect the braking application.
A disc brake having a powered braking mechanism and in combination with a brake circuit, comprising a brake housing with a bore having a piston located therein that displaces a brake pad, and said powered braking mechanism for effecting displacement of said piston and brake pad for a braking application, the braking mechanism comprising a powered rack engaging a pinion, and means comprising screw member means rotatable by said pinion to effect displacement of said piston, such that displacement of said rack effects rotation of the pinion and operation of the screw member means to displace the piston and brake pad and effect the braking application, and the brake circuit connected with said disc brake, the brake circuit comprising pressure application means for effecting a service brake application, valve means operable to effect a hydraulic pressure application and release of said piston for a parking application, and means for generating fluid pressure for said parking application.
Dependencies are inferred from the claim text.