CN111677714A - Piston structure for high-pressure low-friction hydraulic cylinder - Google Patents
Piston structure for high-pressure low-friction hydraulic cylinder Download PDFInfo
- Publication number
- CN111677714A CN111677714A CN202010381512.2A CN202010381512A CN111677714A CN 111677714 A CN111677714 A CN 111677714A CN 202010381512 A CN202010381512 A CN 202010381512A CN 111677714 A CN111677714 A CN 111677714A
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- Prior art keywords
- piston
- oil
- piston ring
- hole
- cylinder barrel
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
- F15B15/1428—Cylinders
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
- F15B15/1447—Pistons; Piston to piston rod assemblies
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
- F15B15/1447—Pistons; Piston to piston rod assemblies
- F15B15/1452—Piston sealings
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
Abstract
The invention discloses a piston structure for a high-pressure low-friction hydraulic cylinder, which comprises a cylinder barrel and a piston arranged in the cylinder barrel in a sliding manner, wherein oil storage holes are uniformly formed in the inner side wall of the cylinder barrel, and each oil storage hole comprises a first oil hole obliquely formed in the inner side wall of the cylinder barrel and a second oil hole obliquely formed in the inner side wall of the cylinder barrel and positioned below the first oil hole. When the piston moves downwards and upwards and the piston ring is located between the first oil hole and the second oil hole of the oil storage hole, the piston ring performs a sealing function together, when the piston moves downwards and upwards and the piston ring is not located between the first oil hole and the second oil hole of the oil storage hole, the first piston ring and the second piston ring perform a sealing function together, pressure and suction are generated by the piston moving upwards and downwards, hydraulic oil flows between the first seal ring and the second seal ring to generate an oil film, friction between the piston and a cylinder barrel is reduced, and the hydraulic oil flows between the first seal ring and the second seal ring to generate the oil film by the pressure and suction generated in the piston moving process, so that the friction between the piston and the cylinder barrel is reduced.
Description
Technical Field
The invention relates to the technical field of pistons of high-pressure low-friction hydraulic cylinders, in particular to a piston structure for a high-pressure low-friction hydraulic cylinder.
Background
The hydraulic cylinder is a hydraulic actuator which converts hydraulic energy into mechanical energy and performs linear reciprocating motion (or swinging motion). It has simple structure and reliable operation. When it is used to implement reciprocating motion, it can omit speed-reducing device, and has no transmission gap, and its motion is stable, so that it can be extensively used in various mechanical hydraulic systems. The output force of the hydraulic cylinder is in direct proportion to the effective area of the piston and the pressure difference between the two sides of the effective area; the hydraulic cylinder basically comprises a cylinder barrel and a cylinder cover, a piston and a piston rod, a sealing device, a buffering device and an exhaust device, wherein the buffering device and the exhaust device are determined according to specific application occasions, and other devices are indispensable.
At present, in some high-pressure low-friction hydraulic cylinders, constant-clearance sealing is adopted for reducing the friction between a piston and a cylinder barrel, but the sealing cannot completely prevent leakage due to the existence of a clearance, so the sealing performance is poor, the use is influenced, if the piston and the cylinder barrel are excessively tightly matched, the oil film between the piston and the inner wall of the cylinder barrel is damaged, but the friction force is increased, and the sealing performance and the lubricating performance are difficult to ensure in a common structure.
Disclosure of Invention
The present invention aims to provide a piston structure for a high-pressure low-friction hydraulic cylinder to solve the problems set forth in the background art.
In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a piston structure for high-pressure low friction pneumatic cylinder, includes the cylinder and slides the piston that sets up in the cylinder inside, the inside wall of cylinder evenly is provided with the oil storage hole, the oil storage hole sets up oilhole one and is located oilhole below slope setting oilhole two on the cylinder inside wall including the slope, the bottom of oilhole one communicates with the bottom of oilhole two each other, the piston outside from the top down is provided with draw-in groove one and draw-in groove two respectively, and draw-in groove one is provided with piston ring one and piston ring two respectively with the inside of draw-in groove two, piston ring one highly is greater than the distance on oilhole one top to two tops of oilhole, piston ring two highly is less than the distance on oilhole one top to two tops of oilhole.
Preferably, the outer side wall of the piston between the first piston ring and the second piston ring is provided with a spiral channel.
Preferably, the outer side of the bottom end of the piston is provided with a ring-shaped notch, and the ring-shaped notch inclines towards the outer side of the piston.
Preferably, an annular oil storage cavity is formed between the outer side of the piston between the first piston ring and the second piston ring and the cylinder barrel.
Preferably, the first clamping groove is matched with the first piston ring, and the second clamping groove is matched with the second piston ring.
Preferably, the oil hole is inclined downward at an angle of 60 degrees.
Preferably, the oil hole has a downward inclination angle of 30 degrees.
Compared with the prior art, the invention has the beneficial effects that:
(1) according to the invention, the oil storage holes are uniformly formed in the inner side wall of the cylinder barrel, each oil storage hole comprises the first oil hole obliquely formed in the inner side wall of the cylinder barrel and the second oil hole obliquely formed in the inner side wall of the cylinder barrel and positioned below the first oil hole, the bottom end of the first oil hole is communicated with the bottom end of the second oil hole, a small amount of oil is stored in the oil storage holes in the up-and-down running process of the piston, the friction between the piston and the cylinder barrel is reduced, the load of the piston in the up-and-down running process is reduced, the service lives of the piston and the cylinder barrel are prolonged, and the first oil hole and the second oil hole of.
(2) According to the invention, the first clamping groove and the second clamping groove are respectively arranged on the outer side of the piston from top to bottom, and the first piston ring and the second piston ring are respectively arranged in the first clamping groove and the second clamping groove, so that the contact area between the piston and the cylinder barrel is reduced under the condition of not influencing sealing, and further the friction between the piston and the cylinder barrel is further reduced.
(3) The height of the first piston ring is larger than the distance from the top end of the first oil hole to the top end of the second oil hole, the height of the second piston ring is smaller than the distance from the top end of the first oil hole to the top end of the second oil hole, when a piston moves downwards and the second piston ring is positioned between the first oil hole and the second oil hole of the oil storage hole, the piston generates pressure on hydraulic oil below the cylinder barrel, so that a small amount of hydraulic oil enters between the first piston ring and the second piston ring through the second oil hole and the first oil hole of the oil storage hole, an upward moving oil film is formed between the outer side of the piston between the first piston ring and the second piston ring and the cylinder barrel, the friction between the whole piston and the cylinder barrel is further reduced, meanwhile, in the process, the oil storage hole at the position of the first piston ring is smeared with oil on the surface of the piston ring under the action of, the negative pressure is generated in the cylinder barrel below the piston, the hydraulic oil between the piston ring I and the piston ring II and the hydraulic oil of the oil hole II and the oil hole I of the oil storage hole between the piston ring I and the piston ring II are discharged into the cylinder barrel below the piston through the oil hole I and the oil hole II of the oil storage hole at the position of the piston ring II, so that a downward moving oil film is formed between the outer side of the piston between the piston ring I and the piston ring II and the cylinder barrel, the friction between the whole piston and the cylinder barrel is further reduced, the piston ring is sealed when the piston moves downwards and upwards and the piston ring is positioned between the oil hole I and the oil hole II of the oil storage hole, and the piston ring I and the piston ring II jointly play a sealing role when the piston moves downwards and upwards and the piston ring II is not positioned between the oil hole I and the oil hole II of the oil storage hole, and the hydraulic oil film, reducing the friction between the piston and the cylinder.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of a portion of the structure of FIG. 1 at A;
FIG. 3 is a schematic view of the piston structure of the present invention
FIG. 4 is a schematic structural diagram of a piston, a first sealing ring and a second sealing ring according to the present invention.
In the figure: 1. a spiral channel; 2. an oil storage hole; 21. a first oil hole; 22. an oil hole II; 3. a piston; 31. a first clamping groove; 32. a second clamping groove; 33. a ring-shaped cut; 4. a first piston ring; 5. a cylinder barrel; 6. and a second piston ring.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-4, an embodiment of the present invention is shown: a piston structure for a high-pressure low-friction hydraulic cylinder comprises a cylinder barrel 5 and a piston 3 arranged inside the cylinder barrel 5 in a sliding mode, oil storage holes 2 are uniformly formed in the inner side wall of the cylinder barrel 5, each oil storage hole 2 comprises an oil hole I21 obliquely arranged on the inner side wall of the cylinder barrel 5 and an oil hole II 22 obliquely arranged on the inner side wall of the cylinder barrel 5 and located below the oil hole I21, the bottom end of the oil hole I21 is communicated with the bottom end of the oil hole II 22, the downward inclination angle of the oil hole I21 is 60 degrees, the downward inclination angle of the oil hole II 22 is 30 degrees, a clamping groove I31 and a clamping groove II 32 are respectively arranged on the outer side of the piston 3 from top to bottom, a piston ring I4 and a piston ring II 6 are respectively arranged inside the clamping groove I31 and the clamping groove II 32, the clamping groove I31 and the piston ring I4 are matched with each other, the clamping groove II, the height of the second piston ring 6 is smaller than the distance from the top end of the first oil hole 21 to the top end of the second oil hole 22, a spiral channel 1 is arranged on the outer side wall of the piston 3 between the first piston ring 4 and the second piston ring 6, an annular oil storage cavity is formed between the outer side of the piston 3 between the first piston ring 4 and the second piston ring 6 and the cylinder barrel 5, an annular notch 33 is formed in the outer side of the bottom end of the piston 3, and the annular notch 33 inclines towards the outer side of the piston.
The working principle is as follows: when the piston 3 runs downwards and the piston ring two 6 is positioned between the oil hole one 21 and the oil hole two 22 of the oil storage hole 2, the piston 3 generates pressure on hydraulic oil in the cylinder barrel 5 below, so that a small amount of hydraulic oil enters between the piston ring one 6 and the piston ring two 4 through the oil hole two 22 and the oil hole one 21 of the oil storage hole 2, an oil film moving upwards is formed between the outer side of the piston 3 between the piston ring one 6 and the piston ring two 4 and the cylinder barrel 5, the friction between the whole piston 3 and the cylinder barrel 5 is reduced, meanwhile, in the process, the oil storage hole 2 positioned at the piston ring one 4 is smeared with oil under the action of the pressure, the oil film is formed on the surface of the piston ring one 4, when the piston 3 runs upwards and the piston ring two 6 is positioned between the oil hole one 21 and the oil hole two 22 of the oil storage hole 2, negative pressure is generated in the cylinder barrel 5 below, the hydraulic oil between the first piston ring 4 and the second piston ring 6 and the hydraulic oil of the oil hole two 22 and the oil hole one 21 of the oil storage hole 2 between the first piston ring 4 and the second piston ring 6 are discharged into the cylinder 5 below the piston 3 through the oil hole one 21 and the oil hole two 22 of the oil storage hole 2 at the position of the second piston ring 6, so that a downward moving oil film is formed between the outer side of the piston 3 between the first piston ring 4 and the second piston ring 6 and the cylinder 5, the friction between the whole piston 4 and the cylinder 5 is reduced, when the piston 3 moves downwards and upwards and the second piston ring 6 is positioned between the oil hole one 21 and the oil hole two 22 of the oil storage hole 2, the first piston ring 4 and the second piston ring 6 play a sealing role together, and when the piston 3 moves downwards and upwards and the second piston ring 6 is not positioned between the oil hole one 21 and the oil hole two 22 of the oil storage hole 2, the invention generates, and hydraulic oil flows between the first sealing ring and the second sealing ring to generate an oil film, so that the friction between the piston and the cylinder barrel is reduced.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and/or modifications of the invention can be made, and equivalents and modifications of some features of the invention can be made without departing from the spirit and scope of the invention.
Claims (7)
1. The utility model provides a piston structure for high-pressure low friction pneumatic cylinder, includes cylinder (5) and slides and set up piston (3) inside cylinder (5), its characterized in that: the inside wall of cylinder (5) evenly is provided with oil storage hole (2), oil storage hole (2) set up oilhole one (21) and lie in oilhole one (21) below slope setting oilhole two (22) on cylinder (5) inside wall including the slope, the bottom of oilhole one (21) communicates with the bottom of oilhole two (22) each other, piston (3) outside is provided with draw-in groove one (31) and draw-in groove two (32) respectively under from the top, and the inside of draw-in groove one (31) and draw-in groove two (32) is provided with one (4) and two (6) respectively, the highly distance that is greater than oilhole one (21) top to oilhole two (22) top of piston ring (4), the highly be less than oilhole one (21) top to the distance on oilhole two (22) top of piston ring two (6).
2. The sampling device for soil remediation according to claim 1, wherein: and a spiral channel (1) is arranged on the outer side wall of the piston (3) between the first piston ring (4) and the second piston ring (6).
3. The sampling device for soil remediation according to claim 1, wherein: and an annular notch (33) is formed in the outer side of the bottom end of the piston (3), and the annular notch (33) inclines towards the outer side of the piston (3).
4. The sampling device for soil remediation according to claim 1, wherein: an annular oil storage cavity is formed between the outer side of the piston (3) between the first piston ring (4) and the second piston ring (6) and the cylinder barrel (5).
5. The sampling device for soil remediation according to claim 1, wherein: the first clamping groove (31) is matched with the first piston ring (4), and the second clamping groove (32) is matched with the second piston ring (6).
6. The sampling device for soil remediation according to claim 1, wherein: the downward inclination angle of the first oil hole (21) is 60 degrees.
7. The sampling device for soil remediation according to claim 2, wherein: and the downward inclination angle of the second oil hole (22) is 30 degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010381512.2A CN111677714B (en) | 2020-05-08 | 2020-05-08 | Piston structure for high-pressure low-friction hydraulic cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010381512.2A CN111677714B (en) | 2020-05-08 | 2020-05-08 | Piston structure for high-pressure low-friction hydraulic cylinder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111677714A true CN111677714A (en) | 2020-09-18 |
| CN111677714B CN111677714B (en) | 2022-03-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010381512.2A Active CN111677714B (en) | 2020-05-08 | 2020-05-08 | Piston structure for high-pressure low-friction hydraulic cylinder |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113323764A (en) * | 2021-06-24 | 2021-08-31 | 潍柴动力股份有限公司 | Cylinder sleeve, cylinder and engine |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070199394A1 (en) * | 2004-05-07 | 2007-08-30 | Dr. Ing H.C.F. Porsche Aktiengesellschaft | Hydraulic Transmission Actuator |
| CN105090159A (en) * | 2015-08-29 | 2015-11-25 | 济南大学 | Low-friction and quick-start hydraulic cylinder based on flutter mechanism |
| CN107013528A (en) * | 2017-05-03 | 2017-08-04 | 哈尔滨理工大学 | A kind of low friction static pressure oil film guide hydraulic cylinder |
| CN208474233U (en) * | 2018-07-03 | 2019-02-05 | 中铁工程装备集团盾构再制造有限公司 | A kind of novel oil cylinder with cleaning function |
-
2020
- 2020-05-08 CN CN202010381512.2A patent/CN111677714B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070199394A1 (en) * | 2004-05-07 | 2007-08-30 | Dr. Ing H.C.F. Porsche Aktiengesellschaft | Hydraulic Transmission Actuator |
| JP2007536478A (en) * | 2004-05-07 | 2007-12-13 | ドクトル インジエニエール ハー ツエー エフ ポルシエ アクチエンゲゼルシヤフト | Hydraulic transmission gearbox actuator |
| CN105090159A (en) * | 2015-08-29 | 2015-11-25 | 济南大学 | Low-friction and quick-start hydraulic cylinder based on flutter mechanism |
| CN107013528A (en) * | 2017-05-03 | 2017-08-04 | 哈尔滨理工大学 | A kind of low friction static pressure oil film guide hydraulic cylinder |
| CN208474233U (en) * | 2018-07-03 | 2019-02-05 | 中铁工程装备集团盾构再制造有限公司 | A kind of novel oil cylinder with cleaning function |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113323764A (en) * | 2021-06-24 | 2021-08-31 | 潍柴动力股份有限公司 | Cylinder sleeve, cylinder and engine |
| CN113323764B (en) * | 2021-06-24 | 2022-08-23 | 潍柴动力股份有限公司 | Cylinder sleeve, cylinder and engine |
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| Publication number | Publication date |
|---|---|
| CN111677714B (en) | 2022-03-18 |
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