Abstract:
On obtient une pompe hydraulique à pistons creux (2) et à plateau biais tournant (3) plus légère et mieux accessible, en réalisant le corps de la pompe (1) à partir d'un tube extérieur (13) dans lequel on répartit annulairement des fourreaux cylindriques (14) constituant les cylindres de pompe et des inserts (17). On remplit ensuite les volumes libres (16) autour des fourreaux (14) et des inserts (17) à l'intérieur du tube (13) de matière synthétique.
Abstract:
A variable displacement axial piston pump (10) having a rocker cam (26) and a rocker cradle (32) in which a complement of recirculating rollers (35) is mounted at each side of the rocker cam (26) to support the cam in the cradle (32) and a holddown plate engages the rollers (35) opposite the bearing surface (34, 35) between the rocker cam and cradle.
Abstract:
A porous bronze 1b and a resin 1c impregnated in pores of the porous bronze 1b formed on a backing metal 1a constitute a bearing 1. At a surface to be brought into contact with a crank shaft 5, porous bronze 1b and resin 1c are sparsely exposed: Ratio of area of exposure of porous bronze 1b at the contact surface 1d is at least 5% and at most 60%. Thus a bearing for a refrigerating compressor having high seizure resistance at the time of boundary lubrication and having small amount of wear caused by sliding as well as a refrigerating compressor employing the same can be obtained.
Abstract:
A piston (10) for use in an engine. The piston (10) includes a piston head (14) having at least one ring groove (26). The piston (10) also includes a piston skirt (18) coated with a first thickness (38) of a bronze coating material, and a side panel (22) adjacent the piston skirt (18) that is coated with a second thickness (42) of the bronze coating material. The first (38) and second (42) thicknesses of the bronze coating material are different. In some embodiments, the bronze coating material also includes aluminum.
Abstract:
The invention relates to a method for producing a ball-and socket joint (1) between a slipper (3) and a piston (2) of a piston engine, comprising the following steps: configuring the slipper (3) with a joint ball (4) at the end opposite the bottom surface (21); configuring the piston (2) with an overmeasure (x) on its lateral surface (2c) and a hemispherical joint recess (5) with a recess edge (7) that protrudes beyond the equator (6) of the joint recess (5), for the joint ball (4) at a front end of the piston (2); bringing together the joint recess (5) and the joint ball (4); beading the recess edge (7) into a form in which it grips the joint ball (4) from behind; and finishing the lateral surface (2c) of the piston (2). The following steps are also provided for the purpose of simplifying and improving the production process: bringing together the joint recess (5) and the joint ball (4) after finishing the lateral surface (2c) of the piston (2); locally heating the recess edge (7) to a temperature that reduces its hardness; and beading the recess edge (7).
Abstract:
A compressor for use with an HFC refrigerant, comprising:
a sealed casing; a motor housed within the sealed casing; compression machinery also housed within the sealed casing, the compression machinery including at least first and second sliding members at least one of which has a material density ratio of at least 95%; and an at least tetravalent ester oil for the refrigerating machine oil which lubricates the sliding members of the compressor.
Abstract:
A compressor for use with an HFC refrigerant, comprising:
a sealed casing; a motor housed within the sealed casing; compression machinery also housed within the sealed casing, the compression machinery including at least first and second sliding members, one of the sliding members being made of a material having a surface hardness of at least HV 1000 after the sliding surface has been nitride treated, and the other sliding material being made of cast iron containing Mo - Ni - Cr; and an at least tetravalent ester oil for the refrigerating machine oil which lubricates the sliding members of the compressor.
Abstract:
Dans cette pompe, chaque segment d'étanchéité (14) du piston (2) est constitué de deux segments élémentaires (19A, 19B) accolés dont les coupes sont droites ou biaises et sont décalées, au montage, de 180° l'une par rapport à l'autre, et d'un expandeur commun (21), et les segments élémentaires sont constitués d'un matériau composite qui contient plus de 50% de bronze, environ 5% de bisulfure de molybdène et le reste de PTFE. Application au pompage en service continu et à charge variable d'azote liquide sous des pressions de 850 bars ou plus.