Rotary telescopic combined oil cylinder

Abstract

The invention discloses a rotary telescopic combined oil cylinder. The rotary telescopic combined oil cylinder comprises a telescopic cylinder body and a rotary cylinder body; the telescopic cylinderbody comprises a first cylinder barrel and a telescopic piston rod; the rotary cylinder body comprises a second cylinder barrel, a spiral piston and a rotary transmission rod; two oil cavities are arranged in the cylinder barrel of the telescopic cylinder body and the cylinder barrel of the rotary cylinder body respectively, and the cylinder barrels are provided with corresponding oil ports correspondingly; one end of a rotary transmission rod is rotationally installed in the rotary cylinder body, and the other end of the rotary transmission rod penetrates into the interior of the first cylinder barrel; an outer circumferential part of a spiral piston is in threaded connection with an inner circumferential part of the second cylinder barrel, the inner peripheral part is in threaded connection with the rotary transmission rod, and the spiral direction of the outer peripheral part of the spiral piston is opposite to the spiral direction of a spiral line of the inner peripheral part; anda blind hole is formed in the telescopic piston rod, a peripheral part of the hole wall of the blind hole is in transmission connection with the rotary transmission rod through a spline so that the rotary transmission rod can drive the telescopic piston rod to rotate, and the telescopic piston rod can move in the axial direction relative to the rotary transmission rod. According to the rotary telescopic combined oil cylinder, enough steering resistance moment can be provided, steering and suspension expansion can be realized, and meanwhile, the space arrangement of a whole vehicle can be compact.

Description

technical field [0001] The invention relates to the technical field of vehicle suspension and steering mechanism design, in particular to a rotary telescopic combined oil cylinder. Background technique [0002] In the field of special vehicle chassis design, because the vehicle suspension cylinder and steering cylinder are arranged at both ends of the axle, the vehicle steering cylinder has a certain swing space, and the suspension cylinder has a certain up and down telescopic stroke, resulting in the space cannot be arranged separately; at the same time, the special vehicle The steering resistance torque is relatively large, and the ordinary rotary cylinder cannot provide the steering resistance torque of the vehicle. [0003] Figure 1 to Figure 3 Shown is a rack and pinion rotary swing oil cylinder disclosed in patent CN106015166A, which drives the rack 07 to move through hydraulic oil, uses the rack 07 to drive the gear shaft 04 to rotate, and the gear shaft 04 drives th...

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Problems solved by technology

[0004] This form of combined oil cylinder can realize the function of rotation and expansion, but the rotation resistance torque provided is small, so it can only be used in occasions where the demand for rotation resistance torque is small; the steering is driven by hydraulic oil into the rack hydraulic cylinder, and the hydraulic pressure is pushed The rack piston moves, and the rack drives the gear meshed with it to rotate. When the required rotation angle is large, the linear movement distance of the rack will increase accordingly. The rack and pinion in this form of combined oil cylinder takes up a lot of space. The overall size of the combined oil cylinder will also increase, which cannot meet the requirements of some vehicle working conditions; the output torque of this type of helical oscillating oil cylinder is also limited by the size, which cannot meet the steering requirements of engineering vehicles

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