Hunan Sany Intelligent Control Equipment Co., Ltd.

Sany Heavy Industry Co., Ltd.

Bingbing Chen

Xiaogang Yi

Yongdong Liu

The present application discloses a hydraulic oil cylinder, of which a piston rod () is provided with at least two cushion collars () which are axially slidable along the piston rod (). Axial throttle oil channels () are provided between the cushion collars () and a piston (). A first cushion collar () is provided with a sealing end face (), and an end cover of a rod cavity () is provided with a sealing end face (). The sealing end face () of the first cushion collar contacts with the sealing end face () of the end cover of the rod cavity to form a seal. Hydraulic oil within the rod cavity is discharged through one axial throttle oil channel () to an oil passage B.

Hydraulic oil cylinder, hydraulic cushion system, excavator and concrete pump truck

A hydraulic oil cylinder has a buffer sleeve (), a rodless cavity sealing end face (-) and at least one throttle oil channel (-). The buffer sleeve () is sleeved on an additional section () of a piston rod in the rodless cavity (-) and axially slidable along the additional section () of the piston rod. The rodless cavity sealing end face (-) is provided in an oil cylinder cavity between a rodless cavity oil passing hole (-) and the termination of the rodless cavity end face of the piston for the retraction process of the piston rod (), and enables to block the buffer sleeve () and attach to the first end surface (-) of the buffer sleeve thereby forming a sealing surface.

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Hunan, China

Bingbing Chen