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1. 发明授权

US06431051B1 Closed cavity hydraulic piston and method of making the same 失效
标题翻译：闭式液压活塞及其制作方法
公开(公告)号：US06431051B1
公开(公告)日：2002-08-13
申请号：US09540290
申请日：2000-03-31
申请人： Robert J. Stoppek , Mark A. Landwehr , Jay H. Ankeny , Allan R. Schuster
发明人： Robert J. Stoppek , Mark A. Landwehr , Jay H. Ankeny , Allan R. Schuster
IPC分类号： F01B300
CPC分类号： B22F3/225 , B22F3/22 , B22F5/008 , B22F2998/00 , F04B1/124 , F16J1/005 , F16J1/08
摘要： A hydraulic piston for a cylinder block of a hydrostatic power unit has an elongated cylindrical body with first and second ends. An elongated cavity is formed in the body. A cap is adhered to the body to close the cavity. The cap has an external shape to facilitate the operative engagement thereof with a slipper, which is in subsequent engagement with a swashplate mounted adjacent the cylinder block. The piston has an elongated first conduit formed in the body which is separate from the cavity and extends between the opposite ends thereof. The conduit terminates in registering communication with a second conduit in the cap thereof to permit transmission of oil through the conduit without invading the volume of the cavity. The cap preferably has a tapered surface on the inner end thereof engaging a compatible shaped surface on an adjacent end of the body to center and align the cap with the body. The tapered surfaces of the cap and body terminate in parallel wall surfaces to create a continuous arcuate interface therebetween which is filled with an adhesive material such as a brazing medium. The body member and the cap are of metallic construction with the material of the cap member being more malleable than the material of the body so as to permit subsequent crimping of the cap as may be required. The body and the cap are preferably formed by a metal injecting molding process utilizing a molding material comprised at the time of molding of a mixture of metallic grains and a binder. The body member and the cap are subjected to a debinding process whereupon the binder material is removed from the molding material and the components are sintered whereupon controlled shrinking occurs. The cap is adapted to terminate either in a spherical ball for attachment to a slipper element, or is comprised of a spherical socket adapted to receive a ball element attached to a slipper element.
摘要翻译：用于静液力动力单元的气缸体的液压活塞具有带有第一和第二端的细长圆柱体。在体内形成细长的腔体。盖子粘附到身体以封闭空腔。盖具有外部形状，以便于与拖鞋的操作接合，该拖鞋随后与安装在缸体附近的斜盘接合。活塞具有形成在主体中的细长的第一导管，其与空腔分离并且在其相对端之间延伸。管道终止于与其盖中的第二管道的通信，以允许油通过导管传输，而不会侵入腔的体积。该盖优选地在其内端具有锥形表面，其接合在本体的相邻端部上的相容的成形表面，以使帽与主体对中并对齐。盖和主体的锥形表面终止于平行的壁表面，以在它们之间形成连续的弧形界面，其中填充有诸如钎焊介质的粘合剂材料。主体构件和盖子是金属结构的，其中盖构件的材料比主体材料更具有延展性，从而允许根据需要随后压盖盖。本体和盖优选通过使用在模制金属颗粒和粘合剂的混合物时所包含的成型材料的金属注射成型方法形成。对本体构件和盖进行脱脂处理，由此将粘合剂材料从成型材料中除去，并且将组分烧结，从而发生受控的收缩。盖子适于终止于用于附接到拖鞋元件的球形球，或者包括适于接收附接到拖鞋元件的球形元件的球形插座。

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