Abstract:
A piston and ring assembly for a compressor that may be used in a vehicle air conditioning system. The assembly comprises a piston and a ring located within a cylinder bore. The ring has a frustoconical shape and the piston has a complementary frustoconical groove. The ring is a parallelogram in cross-section.
Abstract:
A combined steel oil control ring is provided that has steel side rails 1 and a steel spacer expander 2, 2a. The spacer expander includes ear portions 3, 3a for contacting the side rails. The ear portions are substantially equally spaced with each other along the internal circumferential portion of the spacer expander. The ear portions have a radially external circumferential surface respectively. The radially external circumferential surface of the ear portions is adapted to press the side rails radially outwardly by using resilient force caused by the spacer expander. The spacer expander comprises up-and-down contours each formed circumferentially along the radially external circumferential surface, for preventing the side rails from circumferentially rotating relatively to the spacer expander. The up-and-down contours each include at least two axially extending groove regions 6, 6a and at least three axially extending flat regions 7, 7a, The flat regions within each ear portion together have an aggregate circumferential width within a range of 30%-70% of an entire circumferential width of each ear portion. With the arrangement described above, a combined steel oil control ring having up-and-down contours each formed circumferentially along the radially external circumferential surface of the ear portions has an outstanding advantage. The advantage is in that both the up-and-down contours formed along the ear portions and the protruding portions formed on a die for forming the up-and-down contours on the ear portions are prevented from wearing out, whereby the life of the die is prevented from deteriorating or shortening.
Abstract:
A seal and bearing assembly for use in rotating machinery of the type having a rotor which turns within a stationary housing. The rotor and housing define a seal cavity therein in which the seal and bearing assembly is positioned. The assembly comprises a first bearing race adapted for engagement with a rotating surface on the rotor or a stationary surface, a second race adapted for engagement with the other of the rotating or stationary surfaces, and a plurality of bearing elements disposed between the first and second races. A bearing cage may be used which defines a plurality of bearing openings therein disposed between the first and second races, wherein the bearing elements are disposed in the bearing openings. Preferably, the bearing elements are rollers. In one embodiment, the seal and bearing assembly also comprises a ring that substantially seals along the stationary surface in the housing, wherein the ring defines a race engagement surface thereon, the first bearing engages the rotating surface, and the second race engages the race engagement surface. In a preferred embodiment, the assembly has first races on opposite sides of the ring with corresponding second races and bearing elements and/or cages. The bearing components are sized such that any fluid flow or leakage therethrough is minimal.
Abstract:
A pressure fluid-delivery device comprising a cylinder (1), a piston (2) and a reservoir (61) for a fluid. A V-seal (10) is mounted in an annulus between the cylinder (1) and the piston (2). An axial movement of the piston (2) forwards relative to the cylinder (1) results in a delivery of a pressure fluid from the cylinder space (40). A first leg (12), in a similar fashion to a check valve, hereby springingly attempts to seal an outlet opening (43) of a channel (30) which communicates with the reservoir (61). When the piston is moved backwards, this leg (12) can open the outlet opening (43), admitting fluid into the cylinder space (40). The seal (10) rests on a forwardly facing, radially outwardly extending surface (6) of the piston (2). The seal's (10) first leg (12) projects slantingly radially inwards and is arranged to come into abutment against an axially extending portion (3) of the piston. The seal's (10) second leg (13) projects slantingly radially outwards and constantly abuts sealingly against the cylinder surface (14).
Abstract:
The present invention is directed to a system for providing a fluid seal between relatively movable elements, including a hub or a drum and a piston. A groove for retaining a seal is defined in the periphery of one of the rotatable elements, and a spacer element is disposed between the seal and the groove. The seal is formed from a substantially non-deformable material, and the spacer element is substantially non-resilient. The mass of the seal and the spacer element, together with rotational forces acting on the seal and the spacer element, provide a seal between the relatively rotatable elements for preventing flow of fluid.
Abstract:
The invention relates to a piston for a piston-cylinder arrangement, especially a shock absorber piston, comprising a piston body (6) that is fitted with at least one peripheral web (10) on its peripheral surface, wherein a collar-shaped sealing element (9) made of thermoformable plastic material is also formed on the peripheral surface of the piston body (6) in such a way that the web (10) is only formed in part of the height of the material of the collar-shaped sealing element (9).
Abstract:
A shaft sealing apparatus 109 comprising a seal case 1 mounted on a tank shell 102 of rotary equipment, a rotary seal ring 3 fixed to the rotary shaft 106 of the rotary equipment, a stationary seal ring 4 held in the seal case 1 opposite to the rotary seal ring 3 and movable in the axial direction, a coil spring 5 to thrust the stationary seal ring 4 against the rotary seal ring 3, a gas feeding channel 6 formed out of a series of gas passages running through the seal case 1 and the stationary seal ring 4 and opening between the two seal end faces 31, 41 of the two seal rings 3, 4, and a gas jetting mechanism to jet, selectively, a seal gas 71 such as nitrogen and a sterilization gas 72 such as steam through the gas feeding channel 6 into between the seal end faces 31, 41. In normal operation, the shaft seal apparatus 109 functions to seal at the relatively rotating portions of the end faces 31, 41 of the seal rings 3, 4, while holding the seal ends 31, 41 in a non-contact state, by jetting a seal gas 71 such as nitrogen into between the two seal end faces 31, 41. In sterilization mode, a sterilization gas 72 such as steam is jetted into between the two seal end faces 31, 41 instead of the seal gas 71, sterilizing at least the gas feeding channel 6 and the seal end faces 31, 41.
Abstract:
A sealing structure is provided with a seal member for sealing a double fitting portion where an annular member is fit in the internal surface of an outer member at its outer circumferential surface and is also fit on the outer circumferential surface of an inner member at its internal surface. In the sealing structure, the seal member is attached to an end surface of the annular member with an annular groove on its back surface being fit on an annular projection axially protruding from an end surface of the annular member at a radially mid position. At its forward end surface, the seal member is provided with annular outer and inner lips which are axially protruded for respective contacts with the internal surface of the outer member and the outer circumferential surface of the inner member, and is further provided an annular separation zone between the annular outer and inner lips. In a preferred application, the sealing structure is incorporated in a combination of a master cylinder device and a brake booster device having a pull type input rod, wherein first and second master pistons are slidably inserted in a master cylinder of a cylinder body with a piston rod passing through the second master piston to be connected to the first master piston. In this case, the outer member, the annular member and the inner member in the sealing structure are replaced respectively by the cylinder body, the second master piston and the piston rod in the combination, and the seal member of the searing structure operates to seal the clearance between the internal surface of the master cylinder and the outer circumferential surface of the second master piston and the clearance between the internal surface of the second master piston and the outer circumferential surface of the piston rod.
Abstract:
The present invention is directed to a master cylinder provided with an annular seal member (S1) having an annular groove of U-shaped cross section formed on its one end face, and a substantially annular seal retainer (30) for restricting at least axial movement of the seal member, and including a substantially annular lifted wall portion (31) formed to extend axially into the U-shaped annular groove of the seal member, and a substantially annular step portion (32) formed on an inner periphery of the lifted wall portion, for contacting an open end face of the seal member. The seal retainer is reduced in diameter by radial pressing force produced when it is received in a cylinder bore (1), and restored when the pressing force is released. The seal member is placed in an annular hold groove (1d), and the seal retainer is received from an open end of the cylinder bore to be placed in an annular transfer groove (1b), with the seal retainer reduced in diameter. Then, the seal retainer is transferred from the annular transfer groove to an annular hold groove (1c), and the seal retainer is restored in such a state that the lifted wall portion extends into the U-shaped annular groove of the seal member.
Abstract:
A seal assembly for a shaft has a flange fixed to a work piece having a bore hole therein. The flange encircles the shaft and includes a triangular shaped projecting member having first and second surfaces extending from the flange into the bore hole. An angle is formed between the first and second surface. The first surface of the projecting member is in contact with an inner surface of the bore hole or the outer surface of the shaft. An o-ring encircles the shaft and a backup ring is positioned within a space between the shaft, the flange and the o-ring or between the bore hole, the flange and the o-ring. Subject to axial forces, the backup ring undergoes a wedging action between the shaft and the triangular shaped projecting member or between the bore hole and the triangular member to seal where the shaft penetrates the work piece.