Abstract:
A shock absorber, typically for a motor vehicle, comprises a piston rod (6) carrying a piston (8) slidably mounted in an inner tubular member (10), the piston rod (6) extending through a head assembly (12) which provides supportive location between the inner tubular member (10) and the outer tubular member (14). The head assembly comprises a location member (42), by which the inner and outer tubular members (10, 14) are securely located together, and bearing means (26) engage directly between the inner tubular member and the piston rod (6). A sealing means of the head assembly is afforded by a sealing member (22) which is supported directly by the location member. The location member is afforded by an annular metal washer comprising an axial skirt (43), said axial skirt (43) being trapped between the sidewalls of the tubular members, channel means (44) being provided in the underside of the location member to afford an oil flow path.
Abstract:
Piston rod guide for hydraulic shock absorbers of the type comprising an annular part (1) provided with a central opening (5) for the passage of the piston rod, and an elastic ring (4) for retaining the hydraulic fluid. The wall (6) of the central opening (5) is at least partially provided with a coating (2) of a material which reduces the friction and improves the wear-resistance. The guide comprises a second annular part (3), joined by one of its bases (11) to one of the bases (12) of the first annular part (1) and provided at its other base with said elastic retention ring (4). The second annular part (3) is provided with ports (14) in its side wall.
Abstract:
A fluted piston (1) for a volume-compensated pressurized adjustable length positioner. The cylinder is charged through the charging/discharging valve (18) so that the opposed fluid chambers (26, 26a) defined inside the cylinder bore (20) by the slidably movable piston are filled with compressible fluid at elevated pressure. An actuating rod (27) in the piston operates a valve (23) in the piston to open communication between the opposed chambers and allow selective extension and retraction of the piston rod (9). The large-diameter piston rod has an elongated head configuration (6) formed by flute ribs (3). These ribs provide bearing support for the extended piston rod and create a volume compensating space in the piston head (4) to account for the large ratio of extended-rod cylinder volume to retracted-rod cylinder volume.
Abstract:
A bearing device capable of slidably supporting a piston rod without using a guide bush to eliminate fall-off of the guide bush and an additional work such as caulking, capable of reducing the production cost, preventing leak of an oil liquid, preferably having excellent durability and causing the piston rod to smoothly slide for a long time without generating offensive sound. In a bearing device of a single cylinder hydraulic buffer equipped with seal members (55, 56, 57 and 64) and a rod guide (6) or a gas spring or a multi-cylinder type hydraulic buffer, the rod guide (6) includes a cylindrical fitting portion (13) that fits to an end portion of a cylinder (2), a cylindrical bearing portion (16) for guiding the piston rod (5) and a bearing layer (15) integrally fixed to the inner peripheral surface of the cylindrical bearing portion and coming into sliding contact with the outer periphery of the piston rod. While the bearing layer (15) is integrally fixed in advance to only a portion that serves as a portion of the cylindrical bearing portion (16) on the surface of a base material made of a thin steel sheet, the bearing device is integrally shaped into a cylindrical shape by pressing and deep drawing.
Abstract:
A suspension strut comprises inner (15) and outer tubes (1) and incorporates an end closure constituted by a moulded plastics insert (7) containing a sleeve bearing in the form of a metal bush (10), the insert being a press fit into the outer tube of the strut and the press fit region of the insert including a portion adapted to engage with and locate in a radial direction the inner tube of the strut, together with at least two circumferential ribs (40, 41) which extend radially from the insert to engage the inner surface of the outer tube, the material of said ribs being in compression, with said ribs being spaced apart axially of the strut to confer a degree of resilience onto the assembly and a fluid seal (8) being provided at or adjacent the outer face of the end closure to minimize fluid losses from the strut along the relatively movable rod thereof.
Abstract:
A gas spring comprises a body (2) from which a piston rod (7) extends for connection to a member to be acted on by the spring. A seal/guide assembly comprising a bush (13) and seal (14) is provided to guide the piston rod and to form a seal between the piston rod and the body. The bush (13) includes a full diameter portion (16) which locates the bush and a reduced diameter portion (18) with which the seal (14) is frictionally engaged. The seal engages the piston rod by means of a sealing portion (20) and incorporates an extension (21) which extends axially beyond the sealing portion (20) to sealingly engage the body (2) and to act as a buffer for the piston.
Abstract:
Forming part of a spring suspension system for a wheel (1) are telescopically disposed outer and inner parts (5, 6), which are reciprocally displaceable along their longitudinal axes (41). The parts can be exposed to reciprocal transverse forces (F) directed towards the longitudinal axes, at the same time as which the functioning of the spring suspension system is expected to be exercised. A bearing bush (34) between the parts is disposed in a position-variable manner, with a view to ensuring expedient longitudinal displacement movements between the parts (5, 6), in spite of the said transverse forces. The sliding function between means (20) promoting the parts is disposed such that it can be supplied from the top side (13a) of the bearing bush. One or more channels (32), leading from the top side (13a) of the bearing bush to its bottom side (13b), enable a medium to be supplied to the said bottom side. In the event of compression movement between the parts, an underpressure is generated at the bottom side of the bearing bush, which underpressure is used to ensure that the medium is supplied to the bottom side (13b) of the bearing bush.
Abstract:
Swinging gas spring provided so that, even in a "rod up" position, oil or another liquid is durably confined against the conventional seal surrounding the piston rod at the outlet of the cylinder. A secondary annular seal (42) which also surrounds the piston rod (5) is associated to said seal (2) of the rod guiding bottom (1) on the inner side and spaced from the latter in order to delimit therewith an inter-seal space (61) which is filled with oil each time the gas spring is in a "rod down" position and which retains said oil thus effectively trapped when the gas spring is "rod up", the piston (3) or its rod (5) being to this effect integral with a cam means (31) which, when at right angles with said secondary seal (42), spaces apart its internal lip from the surface of the piston rod (5), thereby providing a free passage for the oil along said surface towards said inter-seal space (61). Application to the car industry.
Abstract:
A sealing device including an end portion (11) with an end port (118) for a rod (8) extending therethrough. The device further includes an additional member (20) arranged around the end port (118) and comprising a reinforcement attached to the upper surface (110) of the end portion and having a larger diameter than the end port (118), as well as a single ring-shaped resilient member (22) with an outer surface of which a first portion is freely supported on the upper surface (110) of the end portion, while a second outer surface portion thereof is adhered to the reinforcement. The inner diameter of the unstressed resilient member is smaller than the diameter of said end port so that when the rod is present, the resilient member is radially compressed thereat.
Abstract:
The present invention relates to an arrangement in a gas-filled spring (1) for scraping of a piston rod (2). The first end of the piston rod is connected to a piston (3) axially moveable in a cylinder (4), which piston is designed to be acted upon by a pressure in an internal space (4b) of the cylinder filled with a compressible gas/oil mixture. The second end of the piston rod extends out of the cylinder through an opening centred in a first end (4a) of the cylinder. A scraper element (5) is designed to prevent any impurities in the environment surrounding the gas-filled spring from passing into the cylinder (4) at the inward movement of the piston rod (2). The arrangement is characterised in that the opening surrounding the first end (4a) of the cylinder comprises an inner surface (4a1) corresponding to a surface of an essentially conforming section (5a) formed on the scraper element (5) and surrounding the piston rod (2), which section is positionally fixed in relation to the inner surface (4a1) and is composed of an elastic material which is designed to be deformed under the effect of the pressure in the internal space (4b) of the cylinder, the said section being designed to be applied against the piston rod (2).