CN-224214624-U - Hydraulic buffering and damping suspension cylinder

CN224214624UCN 224214624 UCN224214624 UCN 224214624UCN-224214624-U

Abstract

The utility model discloses a hydraulic buffering damping suspension cylinder which comprises a cylinder bottom, a cylinder body, a piston rod, a piston, a rod head, a guide sleeve and a rod cavity oil port, wherein the piston rod is provided with an inner hole, the piston is provided with a guide ring, the inner hole of the cylinder body is a variable diameter hole, the diameter of the inner hole of the rear section of the cylinder body is smaller than that of the inner hole of the front section of the cylinder body, the outer diameter of the rear section of the piston rod is matched with that of the inner hole of the rear section of the cylinder body, a plurality of radial oil passing holes for communicating the outer circle and the inner hole of the piston rod are arranged in the rear section of the piston rod in front of the piston, a plurality of radial oil paths for communicating the outer circle and the inner hole of the piston rod are arranged in the piston rod in front of all the radial oil passing holes, and one-way valves are arranged in the radial oil paths.

Inventors

YUAN LIN
DAI YUANLONG

Assignees

四川长江液压件有限责任公司

Dates

Publication Date: 20260508
Application Date: 20250523

Claims (4)

1. A hydraulic buffering and damping suspension cylinder comprises a cylinder bottom, a cylinder body, a piston rod, a piston, a rod head, a guide sleeve and a rod cavity oil port, wherein the piston rod is provided with an inner hole, and a guide ring is arranged on the piston; the cylinder is characterized in that the inner hole of the cylinder body is a reducing hole, the diameter of the inner hole of the rear section of the cylinder body is smaller than that of the inner hole of the front section of the cylinder body, the outer diameter of the rear section of the piston rod is matched with that of the inner hole of the rear section of the cylinder body, a plurality of radial oil passing holes for communicating the outer circle and the inner hole of the piston rod are formed in the rear section of the piston rod in front of the piston, a plurality of radial oil paths for communicating the outer circle and the inner hole of the piston rod are formed in the piston rod in front of all the radial oil passing holes, and one-way valves are arranged in the radial oil paths.
2. The hydraulic buffering and damping suspension cylinder as claimed in claim 1, wherein the radial outer ends of the radial oil passing holes are provided with annular grooves.
3. The hydraulic buffering and damping suspension cylinder as claimed in claim 1 or 2, wherein the radial oil paths correspond to the junctions of the rear-section inner hole and the front-section inner hole of the cylinder body when the piston rod is completely retracted in the axial direction.
4. The hydraulic buffering and damping suspension cylinder as claimed in claim 3, wherein the piston is provided with a sealing ring.

Description

Hydraulic buffering and damping suspension cylinder Technical Field The utility model relates to a damping suspension cylinder, in particular to a hydraulic damping suspension cylinder. Background With the stability of mechanical carriers such as trucks, heavy-duty automobiles and the like on suspension, the requirements on comfort performance are higher and higher, a hydraulic suspension system enters the market at a high speed, and a damping suspension cylinder is used as a hydraulic suspension executing mechanism to realize the functions of damping and height change in the suspension system; The common damping suspension cylinder comprises a cylinder bottom, a cylinder body, a piston rod, a piston, a guide sleeve and a rod cavity oil port, wherein the piston is provided with a guide ring, the piston rod is hollow, a row of radially distributed oil passing holes are drilled in front of the piston for communicating the rod cavity with a rodless cavity, during damping action, the piston rod is retracted and pulled out by external force, oil is extruded or sucked from the rodless cavity through the oil passing holes in front of the piston, a certain damping effect is achieved during damping action due to small oil passing area of the oil passing holes, but the problems of untimely reaction, non-linearity damping and the like are solved, stability and comfort are greatly compromised, during active lifting action, the oil enters and exits the rodless cavity through the rod cavity oil port, and the piston rod is stretched due to the fact that the stressed area of the rodless cavity is larger than that of the rod cavity. Disclosure of Invention The utility model aims at overcoming the defects in the prior art, and provides the hydraulic buffering damping suspension cylinder which has the characteristics of timely damping action response and linear damping characteristic distribution, has a good damping effect, and can improve the stability and comfort of a mechanism. The hydraulic buffering and damping suspension cylinder is characterized in that the inner hole of the cylinder body is a variable-diameter hole, the diameter of the inner hole of the rear section of the cylinder body is smaller than that of the inner hole of the front section of the cylinder body, the outer diameter of the rear section of the piston rod is matched with that of the inner hole of the rear section of the cylinder body, a plurality of radial oil passing holes for communicating the outer circle and the inner hole of the piston are formed in the rear section of the piston rod in front of the piston, a plurality of radial oil paths for communicating the outer circle and the inner hole of the piston rod are formed in the piston rod in front of all the radial oil passing holes, and one-way valves are arranged in the radial oil paths; The front section of the cylinder body with larger inner hole diameter is a free travel section, the rear section of the cylinder body with smaller inner hole diameter is a buffer travel section, and a plurality of rows of radial oil passing holes are communicated with rod cavities and rodless cavities at the front side and the rear side of a piston; the check valve is closed in the whole external force retraction process, the number of radial oil passing holes exposed in the free stroke section of the piston rod is gradually reduced, the damping reaction is timely in the front section, the damping phenomenon is gradually enhanced, the damping characteristic is linearly distributed, the damping effect is good, and the stability and the comfort of the mechanism can be improved; when the damping and extending action is performed, the one-way valve is opened, oil enters the rodless cavity, more radial oil passing holes enter a free stroke section along with the extension of the piston rod, oil can enter the rodless cavity from the oil passing holes, the piston rod can rapidly extend, and the reaction is timely; As a further improvement of the utility model, the radial outer ends of the radial oil passing holes are provided with annular grooves, and when the piston rod shock-absorbing action is performed, oil forms an oil ring in the annular grooves, so that the lubrication effect and the supporting and guiding effects can be increased; as a further improvement of the utility model, the radial oil ways correspond to the junction of the inner hole of the rear section and the inner hole of the front section of the cylinder body when the piston rod is completely retracted in the axial direction; as a further improvement of the utility model, the piston is provided with a sealing ring, so that oil can be prevented from being mixed between the rod cavity and the rodless cavity; In conclusion, the damping mechanism has the characteristics of timely damping action response and linear distribution of damping characteristics, has a good damping effect, and can improve the stability and comfort of the mechanism. Drawings FIG