Pump actuator with improved fatigue life

A pump actuator for use between a cam and a pump includes a pump actuator body having a shim defined between a plunger-facing surface and an opposite roller-facing surface, where the plunger-facing surface is recessed into the pump actuator body and offset relative to a radial end. The pump actuator body also includes a cylindrical wall defined between the radial end and the plunger-facing surface. The gasket is formed with a concave surface feature on its plunger facing surface. The opposite roller-facing surface of the shim is subjected to a surface enhancement treatment including shot peening. These features improve the fatigue life of the pump actuator body with neutral mass, alone or in combination. 一种用于在凸轮与泵之间使用的泵致动器，包括泵致动器主体，该泵致动器主体具有限定在面向柱塞表面与相反的面向滚轮表面之间的垫片，其中，面向柱塞表面凹入到泵致动器主体中并且相对于径向端偏移。泵致动器主体还包括限定在径向端与面向柱塞表面之间的柱状壁。垫片在其面向柱塞表面上形成有凹形表面特征部。垫片的相反的面向滚轮表面进行了包括喷丸强化的表面增强处理。这些特征部以单独或组合的方式在质量中性的情况下改善泵致动器主体的疲劳寿命。