(EN) The invention discloses a hydraulic tappet. The hydraulic tappet comprises a tappet body. One end of the tappet body is provided with an oil inlet, and the other end of the tappet body is open. A plunger of the tappet body stretches in through the opening end of the tappet body, and a hydraulic cavity is formed through the plunger and the tappet body. The inner side of the oil inlet is provided with a one-way valve through which an engine oil path can communicate with the hydraulic cavity under the action of engine oil pressure, and the hydraulic cavity is internally provided with a return spring. The outer circumferential face of the plunger is in sliding sealed fit with the inner circumferential face of the tappet body, the plunger is provided with a pressure releasing channel communicating with the hydraulic cavity, and the pressure releasing channel is internally provided with a pressure releasing valve element and a pressure releasing spring. When not subjected to opening pressureaction of an air valve, the pressure releasing valve element is ejected away from a sealing cone by the pressure releasing spring to form an oil leakage gap, and when subjected to opening pressure action of the air valve, the pressure releasing valve element overcomes the elastic force of the pressure releasing spring and makes contact with the sealing cone to achieve sealing. When a cam works and the air valve opens, the relative position of the tappet body and the plunger cannot change, and the performance of an engine is guaranteed.
(ZH) 本发明公开了一种液压挺柱，包括：其挺柱体的一端开设有进油口另一端敞口，其柱塞从挺柱体的敞口端伸入并与挺柱体形成液压腔，进油口的内侧设置有在发动机机油压力作用下可将发动机机油油路与液压腔连通的单向阀，液压腔内设置有回位弹簧；柱塞的外周面与挺柱体的内周面滑动密封配合，柱塞开设有与液压腔相通的泄压通道，泄压通道内设置有泄压阀芯和泄压弹簧，在不受气门开启压力作用时泄压阀芯被泄压弹簧顶离密封锥面形成漏油间隙，在受到气门开启压力作用时泄压阀芯克服泄压弹簧的弹力并与密封锥面接触实现密封。在凸轮工作、气门开启时，挺柱体与柱塞的相对位置不会发生变化，保证了发动机的性能。
