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CN-224214476-U - Rolling friction hydraulic cylinder

CN224214476UCN 224214476 UCN224214476 UCN 224214476UCN-224214476-U

Abstract

The application relates to the technical field of hydraulic cylinders, in particular to a rolling friction hydraulic cylinder which comprises a cylinder barrel and a piston rod axially inserted into the cylinder barrel, wherein the piston is sleeved at the end part of the piston rod, a ball guide sleeve is arranged between the cylinder barrel and the piston rod, a rolling groove is formed in the inner side wall of the ball guide sleeve, and a plurality of balls are arranged in the rolling groove so as to enable the ball guide sleeve to be in rolling fit with the piston rod. According to the application, the rolling grooves capable of circularly rolling the balls are arranged, so that the rolling grooves are designed in a deep and shallow mode, only part of the balls contacted with the piston rod axially roll along the cylinder barrel, rolling friction is formed between the piston rod and the ball guide sleeve, friction between the piston rod and the ball guide sleeve and between the piston rod and the ball guide sleeve are reduced, and the use reliability of equipment is improved.

Inventors

  • YE JING
  • CUI SHUQI
  • WANG WEITANG
  • WANG LEI
  • SHI JUNHONG
  • HU GUOXIANG
  • ZHAO XUAN

Assignees

  • 江苏恒立液压股份有限公司

Dates

Publication Date
20260508
Application Date
20250519

Claims (10)

  1. 1. A rolling friction hydraulic cylinder is characterized by comprising, A cylinder (1) and a piston rod (2) inserted into the cylinder (1) along the axial direction of the cylinder (1); the piston (3) is sleeved at the end part of the piston rod (2); A ball guide sleeve (5) is arranged between the cylinder barrel (1) and the piston rod (2), a rolling groove (53) is formed in the inner side wall of the ball guide sleeve (5), and a plurality of balls (6) are arranged in the rolling groove (53) so that the ball guide sleeve (5) is in rolling fit with the piston rod (2).
  2. 2. Rolling friction hydraulic cylinder according to claim 1, characterized in that a ball piston sleeve (32) is arranged between the cylinder (1) and the piston (3), the outer side wall of the ball piston sleeve (32) is provided with a rolling groove (53), and a plurality of balls (6) are arranged in the rolling groove (53) so that the ball piston sleeve (32) is in rolling fit with the cylinder (1).
  3. 3. Rolling friction hydraulic cylinder according to claim 1 or 2, characterized in that the balls (6) are divided into groups, the rolling track of each group of balls (6) is a closed loop, and the balls (6) in at least one section of rolling track are in rolling fit with the piston rod (2) or the cylinder barrel (1).
  4. 4. Rolling friction hydraulic cylinder according to claim 1, characterized in that the ball guide sleeve (5) comprises a bearing sleeve (51) and a retainer (52), the bearing sleeve (51) is coaxially arranged in the cylinder barrel (1), the retainer (52) is coaxially arranged on the inner side of the bearing sleeve (51), the rolling groove (53) is arranged on the retainer (52), the balls (6) roll circularly in the rolling groove (53), and part of the balls (6) in the rolling groove (53) are in rolling fit with the piston rod (2).
  5. 5. Rolling friction hydraulic cylinder according to claim 1, characterized in that the rolling groove (53) is provided in plurality along the circumference of the ball guide sleeve (5) or the ball piston sleeve (32).
  6. 6. Rolling friction hydraulic cylinder according to claim 1, characterized in that in each of the rolling grooves (53), the portion of the rolling groove (53) in which the ball (6) in rolling engagement with the cylinder tube (1) or the piston rod (2) is located is an active segment (531), and that the active segment (531) in each of the rolling grooves (53) is arranged in the axial direction of the cylinder tube (1).
  7. 7. Rolling friction hydraulic cylinder according to claim 6, characterized in that the length H of the portion of the ball (6) exposed to the rolling groove (53) in the active section (531) in the radial direction of the cylinder tube (1) is greater than the length H of the portion of the ball (6) exposed to the rolling groove (53) in the other portions of the rolling groove (53) than the active section (531).
  8. 8. Rolling friction hydraulic cylinder according to claim 1, characterized in that a guiding sleeve (4) is also arranged between the cylinder barrel (1) and the piston rod (2), the guiding sleeve (4) being located between the cylinder barrel (1) and the ball guiding sleeve (5).
  9. 9. Rolling friction hydraulic cylinder according to claim 8, characterized in that the guide sleeve (4) and the ball guide sleeve (5) are fixed by means of a fastener.
  10. 10. Rolling friction hydraulic cylinder according to claim 1, characterized in that the outer side wall of the piston (3) is provided with an annular groove (31), the ball piston sleeve (32) being arranged in the annular groove (31).

Description

Rolling friction hydraulic cylinder Technical Field The application relates to the technical field of hydraulic cylinders, in particular to a rolling friction hydraulic cylinder. Background The sealing at the side of the guide sleeve of the conventional hydraulic cylinder mainly comprises a dust ring, a sealing ring for a rod, a buffer ring and a guide ring, so that the sealing between the guide sleeve and a piston rod is realized, and hydraulic oil is prevented from flowing out of the oil cylinder. Wherein, the effect of guide ring is for supporting and direction, prevents the mutual contact of metal between uide bushing and the piston rod. For some slender oil cylinders with side load, such as telescopic oil cylinders of overhead working vehicles, the telescopic oil cylinder has the remarkable characteristics of small cylinder diameter and long stroke, most of the existing guide sleeve structures belong to sliding friction of surface contact, and the friction force of the guide sleeve part is large, so that the phenomenon of creeping and shaking is extremely easy to cause when the oil cylinders are operated, and the reliability of equipment is reduced. Disclosure of utility model The utility model aims to solve the technical problem that when the existing hydraulic cylinder is actuated, the friction force between the guide sleeve and the piston rod is large, so that the reliability of equipment is low. To this end, the utility model provides a rolling friction hydraulic cylinder. The technical scheme adopted for solving the technical problems is as follows: A rolling friction hydraulic cylinder comprises a cylinder body, A cylinder, and a piston rod inserted in the cylinder along the axial direction of the cylinder; The piston is sleeved at the end part of the piston rod; A ball guide sleeve is arranged between the cylinder barrel and the piston rod, a rolling groove is formed in the inner side wall of the ball guide sleeve, and a plurality of balls are arranged in the rolling groove so that the ball guide sleeve is in rolling fit with the piston rod. Further, a ball piston sleeve is arranged between the cylinder barrel and the piston, a rolling groove is formed in the outer side wall of the ball piston sleeve, and a plurality of balls are arranged in the rolling groove so that the ball piston sleeve is in rolling fit with the cylinder barrel. Further, the balls are divided into a plurality of groups, the rolling track of each group of balls is a closed loop, and the balls in at least one section of rolling track in the rolling track are in rolling fit with the piston rod or the cylinder barrel. Further, the ball guide sleeve comprises a bearing sleeve and a retainer, the bearing sleeve is coaxially arranged in the cylinder barrel, the retainer is coaxially arranged on the inner side of the bearing sleeve, the rolling groove is formed in the retainer, the balls circularly roll in the rolling groove, and part of the balls in the rolling groove are in rolling fit with the piston rod. Further, the rolling groove is provided in plurality along the circumferential direction of the ball guide sleeve or the ball piston sleeve. Further, in each rolling groove, the rolling groove part where the ball in rolling fit with the cylinder barrel or the piston rod is located is an action section, and the action section in each rolling groove is arranged along the axial direction of the cylinder barrel. Further, in the radial direction of the cylinder tube, the length H of the part of the ball exposed to the rolling groove in the action section is longer than the length H of the part of the ball exposed to the rolling groove when the ball is positioned in the other part of the rolling groove except the action section. Further, a guide sleeve is arranged between the cylinder barrel and the piston rod, and the guide sleeve is positioned between the cylinder barrel and the ball guide sleeve. Further, the guide sleeve and the ball guide sleeve are fixed through a fastener. Further, an annular groove is formed in the outer side wall of the piston, and the ball piston sleeve is arranged in the annular groove. The utility model has the beneficial effects that the rolling groove capable of circularly rolling the balls is arranged on the inner side wall of the ball guide sleeve, the balls circularly roll in the rolling groove, the rolling direction of the balls in the rolling groove, which are in rolling fit with the piston rod, is axially arranged along the piston rod, so that rolling friction is formed between the piston rod and the ball guide sleeve, the friction force between the piston rod and the ball guide sleeve is reduced, and the rolling groove is designed deeply and shallowly so that only part of the balls contacted with the cylinder barrel and the piston rod axially roll along the cylinder barrel, thereby reducing the friction of the balls in the rolling groove, and the balls can move along rolling tracks instead of rol