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发明授权
US5279206A Variable displacement hydrostatic device and neutral return mechanism therefor 失效
可变排量静液压装置及其中性返回机构

Variable displacement hydrostatic device and neutral return mechanism therefor
摘要：
A variable displacement radial ball pump (11) is disclosed of the type in which the balls (59) are restrained by a cam ring (25), which is pivotable about a cam pivot pin (27) to vary the displacement of the pump. In accordance with the invention, in order to return the pump to absolute zero displacement, the pump is provided with a detent mechanism (65;83). The cam ring 25 has a neutral region (73) and a ramp surface (77), and a detent member (69;89) is biased into engagement with the neutral region when the cam ring is in neutral (FIGS. 2 and 3). When the cam ring is displaced from neutral, the detent member engages the ramp surface, against the bias force of a spring (71;91), which exerts a force tending to return the cam ring to neutral in the absence of an input to the control assembly (33).
摘要（中）：

公开了一种可变排量径向球泵（11），其中球（59）被凸轮环（25）约束，该凸轮环可围绕凸轮枢轴销（27）枢转以改变泵的排量。 根据本发明，为了将泵返回到绝对零位移，泵设有制动机构（65; 83）。 凸轮环25具有中立区域（73）和斜​​面（77），并且当凸轮环处于空档时，止动构件（69; 89）被偏置成与中性区域接合（图2和图3） 。 当凸轮环从中性位移时，止动构件抵抗弹簧（71; 91）的偏压力与斜面接合，弹簧（71; 91）施加力，以在不存在输入的情况下使凸轮环返回中性 控制组件（33）。

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