摘要：【中文】本发明属于发动机制动技术领域，公开了一种发动机辅助制动装置，包括：阀体，所述阀体的周壁沿轴向间隔开设有第一油孔和第二油孔；定子，固定于阀体内，且所述定子上设有滑销；阀芯，套设于定子外，阀芯、定子以及阀体之间形成有螺旋油道，螺旋油道的一端连通第一油孔，另一端连通第二油孔，滑销置于螺旋油道内；柱塞，固接于阀芯端部；通过第一油孔或第二油孔向螺旋油道充油时，阀芯能被油压带动相对于定子转动，并带动柱塞沿轴向移动。本发明采用阀芯的旋转运动实现柱塞的伸出与回位，在制动过程中，通过面接触传递压力，减小磨损风险，提高可传递压力值，结构可靠，确保了制动效果。 【EN】The invention belongs to the technical field of engine braking, and discloses an auxiliary braking device for an engine, which comprises: the valve comprises a valve body, a valve body and a valve body, wherein a first oil hole and a second oil hole are formed in the peripheral wall of the valve body at intervals along the axial direction; the stator is fixed in the valve body, and a sliding pin is arranged on the stator; the valve core is sleeved outside the stator, a spiral oil duct is formed among the valve core, the stator and the valve body, one end of the spiral oil duct is communicated with the first oil hole, the other end of the spiral oil duct is communicated with the second oil hole, and the sliding pin is arranged in the spiral oil duct; the plunger is fixedly connected to the end part of the valve core; when oil is filled into the spiral oil duct through the first oil hole or the second oil hole, the valve core can be driven by oil pressure to rotate relative to the stator and drive the plunger to move along the axial direction. The invention adopts the rotary motion of the valve core to realize the extension and the return of the plunger, and in the braking process, the pressure is transmitted through surface contact, so that the abrasion risk is reduced, the transmittable pressure value is improved, the structure is reliable, and the braking effect is ensured.