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US 5,960,922 AGranted
Hydraulic cylinder such as a clutch master or servant cylinder in a motor vehicle having a bleed element
AssigneeFichtel & Sachs AG
InventorsThomas Riess, Olaf Pagels, Boleslaw Tulaczko, Wolfgang Grosspietsch
Life of this patent
Estimating the term…
Abstract
A cylinder for pressure media, in particular a hydraulic master or slave cylinder in motor vehicles, having a bleed element which can be screwed into an aperture in the cylinder casing and which bleed element is sealed against the casing. The bleed element is functionally connected in the vicinity of that end inserted in the casing to a round sealing element, which is pressed axially against a shoulder in the aperture.
Claims17
A piston-cylinder arrangement for a hydraulic system in a motor vehicle, said piston-cylinder arrangement comprising:
- a hydraulic actuating apparatus;
- said hydraulic actuating apparatus comprising:
- a cylinder, said cylinder having a first end and a second end and defining a chamber therein, at least a portion of said chamber being configured to contain hydraulic fluid therein;
- a piston rod extending through said first end of said cylinder and into said chamber;
- an outlet for providing hydraulic fluid to flow into and out of said chamber;
- said cylinder comprising:
- a piston being disposed on said piston rod within said chamber, said piston dividing said chamber into at least two chamber portions, said piston being movable within said chamber;
- at least one of said at least two chamber portions being configured to contain said hydraulic fluid therein;
- a connection for connecting said outlet for providing said hydraulic fluid to said at least one of said at least two chamber portions containing hydraulic fluid therein;
- an arrangement to permit bleeding of hydraulic fluid from said cylinder;
- said bleeding arrangement comprising an element being disposed to permit bleeding of hydraulic fluid from said cylinder;
- said bleeding element comprising a first end portion and a second end portion;
- said cylinder comprising an aperture to receive said first end portion of said bleeding element and to permit bleeding of hydraulic fluid from said cylinder;
- said aperture having a longitudinal axis along which said first end portion of said bleeding element is insertable;
- said aperture having a first shoulder within said aperture;
- said first shoulder being disposed substantially transverse to the longitudinal axis of said aperture;
- said first end portion of said bleeding element extending into said aperture and said second end portion of said bleeding element extending from said aperture;
- an element for sealing said aperture, said sealing element being disposed between said first end portion of said bleeding element and said first shoulder of said aperture;
- said bleeding element being configured and disposed to selectively press and release said sealing element against said first shoulder in a direction substantially along the longitudinal axis of said aperture and for permitting and stopping bleeding of hydraulic fluid from said cylinder;
- said sealing element being round;
- said bleeding element comprising a threaded portion;
- said aperture comprising a threaded portion;
- said threaded portion of said bleeding element and said threaded portion of said aperture being configured to screw said bleeding element and said aperture together;
- said sealing element comprising a first side and a second side;
- said first side being disposed adjacent to said first shoulder of said aperture;
- said second side being disposed on a side of said sealing element opposite said first side;
- said arrangement comprising one of a), b) and c), as follows:
- a) said sealing element comprising a ring-shaped sealing element;
- b) said bleeding element comprising a groove;
- and
- said sealing element comprising an O-ring to be seated in said groove of said bleeding element;
- and
- c) said bleeding element comprising a stud;
- and
- said stud extending from said first end portion of said bleeding element;
- said sealing element comprising an elastic cap mounted onto said stud of said bleeding element;
- said sealing element having a height along the longitudinal axis of said aperture;
- said aperture comprising a pathway to permit bleeding of said cylinder;
- said bleed path comprising one of d) and e) as follows:
- d) a radial, helical bleed duct;
- said bleed duct extending along the height of said sealing element;
- said bleed duct comprising a mouth;
- said mouth being configured and disposed to receive hydraulic fluid from said cylinder at said first shoulder of said aperture;
- and
- e) at least one axial groove;
- and
- said groove extending along the height of said sealing element.
44 more elements
A piston-cylinder arrangement for a hydraulic system in a motor vehicle, said piston-cylinder arrangement comprising;
- a hydraulic actuating apparatus;
- said hydraulic actuating apparatus comprising:
- a cylinder, said cylinder having a first end and a second end and defining a chamber therein, at least a portion of said chamber being configured to contain hydraulic fluid therein;
- a piston rod extending through said first end of said cylinder and into said chamber;
- an outlet for providing hydraulic fluid to flow into and out of said chamber;
- said cylinder comprising:
- a piston being disposed on said piston rod within said chamber, said piston dividing said chamber into at least two chamber portions, said piston being movable within said chamber;
- at least one of said at least two chamber portions being configured to contain said hydraulic fluid therein;
- a connection for connecting said outlet for providing said hydraulic fluid to said at least one of said at least two chamber portions containing hydraulic fluid therein;
- an arrangement to permit bleeding of hydraulic fluid from said cylinder;
- said bleeding arrangement comprising an element being disposed to permit bleeding of hydraulic fluid from said cylinder;
- said bleeding element comprising a first end portion and a second end portion;
- said cylinder comprising an aperture to receive said first end portion of said bleeding element and to permit bleeding of hydraulic fluid from said cylinder;
- said aperture having a longitudinal axis along which said first end portion of said bleeding element is insertable;
- said aperture having a first shoulder within said aperture;
- said first shoulder being disposed substantially transverse to the longitudinal axis of said aperture;
- said first end portion of said bleeding element extending into said aperture and said second end portion of said bleeding element extending from said aperture;
- an element for sealing said aperture, said sealing element being disposed between said first end portion of said bleeding element and said first shoulder of said aperture;
- said bleeding element being configured and disposed to selectively press and release said sealing element against said first shoulder in a direction substantially along the longitudinal axis of said aperture and for permitting and stopping bleeding of hydraulic fluid from said cylinder;
- said bleeding element comprising a threaded portion;
- said aperture comprising a threaded portion;
- said threaded portion of said bleeding element and said threaded portion of said aperture being configured to screw said bleeding element and said aperture together;
- said cylinder comprising an arrangement to prevent hydraulic fluid from leaking past said threaded portion of said bleeding element and said threaded portion and of said aperture;
- said arrangement to prevent hydraulic fluid leakage comprising at least two ribs, said at least two ribs being disposed on said threaded portion of said bleeding element;
- said at least two ribs being diametrically opposed from one another;
- said at least two ribs being disposed to protrude radially outward from said threaded portion of said bleeding element;
- said at least two ribs protruding axially over a complete turn of said threaded portion of said bleeding element.
24 more elements
A piston-cylinder arrangement for a hydraulic system in a motor vehicle, said piston-cylinder arrangement comprising:
- a hydraulic actuating apparatus;
- said hydraulic actuating apparatus comprising:
- a cylinder, said cylinder having a first end and a second end and defining a chamber therein, at least a portion of said chamber being configured to contain hydraulic fluid therein;
- a piston rod extending through said first end of said cylinder and into said chamber;
- an outlet for providing hydraulic fluid to flow into and out of said chamber;
- said cylinder comprising:
- a piston being disposed on said piston rod within said chamber, said piston dividing said chamber into at least two chamber portions, said piston being movable within said chamber;
- at least one of said at least two chamber portions being configured to contain said hydraulic fluid therein;
- a connection for connecting said outlet for providing said hydraulic fluid to said at least one of said at least two chamber portions containing hydraulic fluid therein;
- an arrangement to permit bleeding of hydraulic fluid from said cylinder;
- said bleeding arrangement comprising an element being disposed to permit bleeding of hydraulic fluid from said cylinder;
- said bleeding element comprising a first end portion and a second end portion;
- said cylinder comprising an aperture to receive said first end portion of said bleeding element and to permit bleeding of hydraulic fluid from said cylinder;
- said aperture having a longitudinal axis along which said first end portion of said bleeding element is insertable;
- said aperture having a first shoulder within said aperture;
- said first shoulder being disposed substantially transverse to the longitudinal axis of said aperture;
- said first end portion of said bleeding element extending into said aperture and said second end portion of said bleeding element extending from said aperture;
- an element for sealing said aperture, said sealing element being disposed between said first end portion of said bleeding element and said first shoulder of said aperture;
- said bleeding element being configured and disposed to selectively press and release said sealing element against said first shoulder in a direction substantially along the longitudinal axis of said aperture and for permitting and stopping bleeding of hydraulic fluid from said cylinder;
- said sealing element being round;
- said sealing element having a height along the longitudinal axis of said aperture;
- said aperture comprising a pathway to permit bleeding of said cylinder;
- said bleed path comprising one of a) and b) as follows:
- a) a radial, helical bleed duct;
- said bleed duct extending along the height of said sealing element;
- said bleed duct comprising a mouth;
- and
- said mouth being configured and disposed to receive hydraulic fluid from said cylinder at said first shoulder of said aperture;
- and
- b) at least one axial groove;
- and
- said groove extending along the height of said sealing element.
29 more elements
Dependencies are inferred from the claim text.