Multistage dual-hinge-shaft inverted oil cylinder

Abstract

The invention discloses a multistage dual-hinge-shaft inverted oil cylinder for a dumper, and relates to the technical field of dumper oil cylinders. The multistage dual-hinge-shaft inverted oil cylinder comprises a base barrel assembly, multiple stages of cylinder barrel assemblies, a piston rod assembly, a cylinder bottom assembly and a sealing assembly. The sealing assembly comprises a dustproof ring and two Y-type sealing rings. The base barrel assembly comprises a base barrel, a pressing ring fixed to the base barrel and a base barrel hinge shaft base, and further comprises a base barrel hinge shaft arranged on the base barrel hinge shaft base. The piston rod assembly comprises a piston rod and a piston rod hinge shaft arranged on the end portion of the piston rod. The base barrel hinge shaft is hinged to a carriage, and the piston rod hinge shaft is hinged to a vehicle frame. By means of the dual-hinge-shaft installation mode, the stress situation is good. By means of the inverted structure, one stage of protective barrels is omitted, production cost is reduced, the Y-type sealing rings are installed in the mode that the openings of the Y-type sealing rings are upwards so that a sealing area can have pressure even if in a low-pressure situation, and low-pressure sealing performance is guaranteed.

Description

technical field [0001] The invention relates to the technical field of dump truck oil cylinders, in particular to a multi-stage double-hinge shaft inverted oil cylinder for dump trucks. Background technique [0002] Existing dump truck oil cylinders are divided into front top cylinder and middle top cylinder. The middle top cylinder is limited by the installation space, pressure and other conditions, and it is mostly used in small dump trucks, and the market scope is relatively small. The front top cylinder can provide a relatively large thrust, and the installation space is relatively large, and it is mostly used in medium-sized and heavy-duty dump trucks, and the market demand is relatively large. The front top cylinder of the dump truck is a multi-stage single-acting telescopic sleeve hydraulic cylinder, which can be divided into double hinge shaft type and hinge shaft clevis type according to the installation form. [0003] The hinge shaft of the hinged clevis cylinder...

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Problems solved by technology

[0003] The hinge shaft of the hinged clevis cylinder is connected to the frame, the clevis is connected to the carriage, and the clevis is equipped with joint bearings. The thickness of the clevis and the bearing is relatively thin, the force arm is relatively small, the force condition is relatively poor, and the ability to resist partial load is relatively poor; The upper and lower sides of the double-hinge shaft cylinder are connected by the hinge shaft, so the force bearing condition is relatively good, and the anti-eccentric load capacity is relatively strong, but it has one more level of protection cylinder than the hinge shaft clevis type oil cylinder.

[0004] In actual work, because the actual working conditions are more complicated, such as uneven working roads, working while walking, etc., unbalanced loads are unavoidable, which requires the oil cylinder to have a certain ability to resist unbalanced loads. Hinged shaft oil cylinder, but the double hinged shaft oil cylinder has one more cylinder barrel, which increases the cost a lot, which is against the principle of market economy and is not conducive to product market competition

In addition, in order to ensure the high-pressure sealing performance, these two types of oil cylinders usually use two-stage Y-ring seals and one-stage dust-proof rings for dust-proof sealing, which results in poor low-pressure sealing performance, and leakage is prone to occur under low pressure conditions Case

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