| 摘要 |
A rotary positive displacement hydraulic machine in the form of a gear pump or motor comprising a housing 10 defining two mutually intersecting parallel working chambers 11 and 12 having a low pressure inlet side and a high pressure outlet side. Two meshing rotors 19 and 20 are mounted for rotation in the two chambers, respectively, and two bearing supports 14 and 15 are provided at opposite ends of the chambers. Each bearing support supports bearings 16, 17 in which the rotors are journalled for rotation. At least one end of the housing is closed by a separate end cover 13. The separate end cover and an adjacent end of the housing each has at least one elongate recess 30, 32 respectively on each of the two major sides of the working chambers. The recesses in the end cover are alignable with respective recesses in the adjacent end of the housing and there is at least one keying element 34 in each pair of aligned recesses so that the open end of the housing is supported against relative movement by differential fluid pressure in the chambers in a direction transverse to a plane containing the axes of rotation of the meshing rotors. <IMAGE>
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