Oil cylinder

Abstract

The invention discloses an oil cylinder and aims to solve the problems that in the prior art, oil in oil cylinders on fitness equipment is liable to leak, and the oil cylinders are not suitable for physical exercise of wide population. The oil cylinder comprises a cylinder block provided with a piston cavity. The piston cavity is provided with a piston rod capable of contracting into the cylinderblock or extending out of the cylinder block. An elastic piston which divides the piston cavity into a first secondary cavity and a second secondary cavity is arranged on the piston rod. The piston rod can drive the elastic piston to reciprocate in the piston cavity. The piston rod is provided with an oil drainage channel communicating with the first secondary cavity and a second secondary cavity.By driving the piston rod, the elastic piston is driven by the piston rod to move and better intercepts the oil drainage channel along with increase of driving force of the elastic piston; and by applying the oil cylinder on the fitness equipment, damping of the fitness equipment is increased automatically along with increase of force of exercisers, a medium circulates inside, compared with the prior art, the oil cylinder has the advantages of being suitable for wider population, simple in structure, low in production cost, capable of reducing oil pollution and the like.

Description

technical field [0001] The invention belongs to the technical field of oil cylinders, in particular to an oil cylinder for fitness equipment. Background technique [0002] The oil cylinder for fitness equipment refers to a mechanical device that provides damping force for various fitness equipment to replace various weights and springs. The damping force provided by it has the characteristics of stable force value, adjustable and low noise, making the whole machine Compact and simple, easy to disassemble and assemble, it is currently widely used in various fitness equipment. [0003] At present, the oil cylinder used for fitness equipment on the market has an oil cylinder block, an oil cylinder piston, and an oil cylinder piston rod. The oil cylinder piston rod is interspersed in the oil cylinder body. There are oil outlet A and oil outlet B on the body. By driving the piston rod of the oil cylinder to drive the oil cylinder piston to move back and forth in the cylinder bod...

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Problems solved by technology

[0004] However, the medium of this oil cylinder is an external circulation, and the medium can be oil, which is prone to oil leakage and oil pollution. The damping provided by the oil cylinder is constant, and it is difficult for people with small strength or weight to drive, and it is difficult for people with large strength or weight to drive. Lighter, resulting in a less effective workout, so not suitable for general use

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