Abstract:
A die apparatus for forging a steering rack from a bar. The die apparatus comprises a first and a second bolster movable towards each other, and at least one gripper adapted to grip the bar as the rack is forged. The gripper comprises first and second gripper halves carried by, and movable relative to, the first and second bolsters respectively. A gripper bias means biases the gripper halves towards each other. As the bolsters move towards each other to forge the rack, the first gripper half abuts against the first bolster, and the second gripper half abuts the second bolster.
Abstract:
A rack and pinion steering gear for a vehicle. The steering gear comprising a rack having rack teeth and a pinion having pinion teeth that mesh with the rack teeth. The rack teeth and the pinion teeth both have a herringbone form. The rack teeth may have a variable ratio form.
Abstract:
A method and apparatus for manufacturing partially finished sleeves for hydraulic power steering valves. The method comprises gripping and rotating a solid cylindrical bar in a spindle with a portion of the bar protruding from the spindle. A plurality of forming rolls engages with and feeds along the bar, whilst a rotating punch feeds into the end of the bar, to extrude the bar into a tubular form. A cutting tool parts off a portion of the tubular form to provide a partially finished sleeve.
Abstract:
Es wird ein Verfahren und eine Anordnung zur Erfassung der Bewegung oder des Drehwinkels an bewegten mechanischen Bauteilen vorgeschlagen, bei dem Codesignale ausgewertet werden, die durch Abtasten von mehreren senkrecht zur Bewegungsrichtung nebeneinander liegenden Codespuren (2,3,4,5;2',5') auf dem bewegten Bauteil mittels jeweils zugeordneter Detektorzeilen (6,7,8,9,10) eines stationären Sensors erzeugt werden. Es werden zusätzliche Detektorzeilen (10) derart angeordnet, dass bei maximaler Toleranz (AT) des bewegten Bauteils senkrecht zur Bewegungsrichtung jeder Codespur (2, 3, 4, 5; 2' , 5' ) mindestens eine der Detektorzeilen (6,7,8,9,10) zugeordnet werden kann .
Abstract:
An axial flow rotary valve (1) for an internal combustion engine and method of manufacture thereof. The valve comprising a centre portion (5) having a cylindrical periphery, inlet and exhaust portions(9, 16) both smaller in diameter than the centre portion, and an inlet port (3) and an exhaust port (4) terminating respectively as an inlet opening (6) and an exhaust opening (7) in the periphery of the centre portion. The centre portion having at least one elongate passage (21) communicating between the inlet portion and the exhaust portion, the whole of the passage being disposed circumferentially outside the openings and radially outside at least one of the inlet and exhaust portions.
Abstract:
A sealing system for an axial flow rotary valve internal combustion engine comprising an array of floating gas seals and an optional oil sealing system. The array of floating seals surrounding a window (15) in the bore (11) of the cylinder head (10) through which the ports (2, 3) of the valve (1) communicate with a combustion chamber (31). The array of floating seals comprising axial seals (16) and circumferential seals (17) housed in slots (18, 19) in the bore o the cylinder head wherein the circumferential seals are disposed axially between the ends of the axial seals.
Abstract:
A method of manufacturing steel components particularly suited to components such as steering racks having net shape forged gear teeth. The method comprising heating at least a portion of a steel blank to a first temperature of at least 600 °C, forging the portion to shape, cooling the portion in a controlled manner to a second temperature above 200 °C, then immediately heating at least part of the surface of the portion to an austenising temperature, and then quenching the portion to harden the surface.
Abstract:
A die apparatus and method for performing a flashless forging operation to manufacture the toothed portion of a steering rack. The die apparatus comprising first and second die members and at least one punch member, each having a forming surface shaped substantially as the obverse of a portion of said toothed portion, and at least a portion of the forming surface of said first die member being shaped substantially as the obverse of the teeth of said rack. Said first and second die members being moveable towards each other to a closed position thereby partially forging said toothed portion from a blank placed in said die apparatus and forming a substantially closed cavity defined by said forming surfaces, said punch member being adapted to move into said cavity, once said die members are in said closed position, thereby completing said forging operation.
Abstract:
A forged gear and a method of manufacture thereof. The forged gear comprises a bevel gear with a plurality of teeth, each tooth having a tip disposed between two faces and two ends, the two faces extending in a substantially longitudinal direction of the tooth, wherein the tip of each tooth has at least one substantially crowned portion between the two ends along the longitudinal direction. The method of manufacture comprises forging the gear from a blank such that during the forging operation a substantial portion of the length of each forged tooth tip does not contact the die cavity.
Abstract:
A steering system for a vehicle comprising a steering gear (10) having a rack (12) and a pinion (14) in mesh therewith. The rack (12) being laterally displaceable with respect to the vehicle as a function of inputs from a steering wheel (24) through rotation of the pinion (14), and a steering superposition means (32). The steering system further comprising first and second road wheels (20a, 20b) steerable by rotation of first and second steering arms (21a, 21b) respectively by means of first and second tie rods (15a, 15b) arranged to transmit lateral displacement of the rack (12) to the first and second steering arms (21a, 21b) respectively. Lateral displacement of the rack (12) being transmitted to at least one of the steering arms (21a, 21b) through a linear actuator (25). The linear actuator (25) and the steering superposition means (32) being controlled by a control means (30) in response to at least one sensed parameter (31).