CN209875606U - Static-pressure sealing low-friction hydraulic cylinder with oval oil cavity - Google Patents
Static-pressure sealing low-friction hydraulic cylinder with oval oil cavity Download PDFInfo
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- CN209875606U CN209875606U CN201920278629.0U CN201920278629U CN209875606U CN 209875606 U CN209875606 U CN 209875606U CN 201920278629 U CN201920278629 U CN 201920278629U CN 209875606 U CN209875606 U CN 209875606U
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Abstract
The utility model relates to a static-pressure sealing low-friction hydraulic cylinder with an oval oil cavity, which comprises a static-pressure piston, a static-pressure guide sleeve, a piston rod and a cylinder body; utilize hydrostatic bearing's principle, the utility model discloses to the oval static pressure oil pocket of pneumatic cylinder piston surface and uide bushing inner surface processing, oval oil pocket is slick and sly curve all around, can obviously reduce liquid and hinder oil, is full of hydraulic oil between chamber and the oil-sealed limit, utilizes liquid lubrication to replace solid friction between the traditional pneumatic cylinder, improves the life-span of pneumatic cylinder to having pneumatic cylinder low friction standard.
Description
Technical Field
The utility model belongs to hydraulic transmission specialty field. By utilizing the static pressure supporting sealing principle, the outer surface of the piston is filled with the oval oil cavity processed on the inner surface of the guide sleeve, the solid friction of the traditional hydraulic cylinder is replaced by liquid lubrication, the friction force generated by sealing of the sealing ring of the traditional hydraulic cylinder is reduced, the self-lubrication in the motion process of the hydraulic cylinder can be realized, the service life of the hydraulic cylinder is prolonged, and the hydraulic cylinder is suitable for the technical field of hydraulic cylinders.
Background
The hydraulic cylinder is used as an actuating element and a power element of a hydraulic system, the performance of the hydraulic cylinder is influenced by the friction performance of the hydraulic cylinder, the piston and the inner surface of the cylinder body, the guide sleeve and the piston rod of the traditional hydraulic cylinder are sealed by sealing pieces, and the piston and the cylinder body are in solid contact, so that the friction force in the hydraulic cylinder is increased due to the solid friction, and the service life of the hydraulic cylinder is greatly shortened.
Under the background, by using the hydrostatic bearing principle, the clearance sealing principle and the tribology principle, the hydraulic cylinder utilizing the hydrostatic bearing sealing principle can well complete the low friction, so that the hydraulic cylinder becomes an important research direction of modern hydraulic transmission. The hydraulic cylinder aims at the problems of the prior hydraulic cylinder technology, such as large friction force, short service life, and low dynamic performance and working stability. The design, the structure optimization and other aspects of the piston and the guide sleeve are started, and systematic and deep research is carried out on the piston and the guide sleeve used by the hydraulic cylinder.
Disclosure of Invention
The utility model aims at overcoming the weak point that above-mentioned prior art pneumatic cylinder exists, and designed the static-pressure sealing low friction pneumatic cylinder of an oval oil pocket, make the contact surface between pneumatic cylinder piston and cylinder body internal surface, uide bushing and the piston rod be hydraulic oil, can effectual reduction traditional pneumatic cylinder adopt the sealing washer sealed and the frictional force that produces, improve the work efficiency of pneumatic cylinder, improve the working life of pneumatic cylinder.
The utility model relates to a static-pressure sealing low-friction hydraulic cylinder with an oval oil cavity, which is characterized by comprising a static-pressure piston (2), a cylinder body (3), a static-pressure guide sleeve (5), a piston rod (9) and a dustproof ring (10); the dustproof ring (10) is made of rubber, is low in price and is in a trapezoidal structure, so that the dustproof ring can be better attached to the piston rod (9) and plays a better dustproof role; the static pressure piston (2) is made of No. 45 steel, 4 elliptical static pressure piston oil cavities (18) are machined on the outer surface of the static pressure piston, smooth curves are arranged on the peripheries of the elliptical oil cavities, liquid resistance can be obviously reduced, the 4 static pressure piston oil cavities (18) are uniformly distributed on the outer surface of the static pressure piston (2), a static pressure piston oil inlet (17) is formed in the center of an ellipse of each elliptical oil cavity, 2 static pressure piston oil discharge grooves (16) are machined at two ends of each piston, static pressure piston oil outlets (15) are machined in the same direction of the two static pressure piston oil discharge grooves, and the machining angles of 45 degrees are kept between the static pressure piston oil inlets and the static pressure; the piston rod (9) is made of low-carbon steel, the surface of the piston rod is treated to be rough by a grinding machine finally, a piston rod oil inlet (13) is formed in the center of the end face and is communicated with a static pressure piston oil inlet (17), a piston rod oil outlet (14) is machined below the piston rod oil inlet (13) and is communicated with a static pressure piston oil outlet (15); the material of the static pressure guide sleeve (5) is No. 45 steel, 4 oval static pressure guide sleeve oil cavities (6) are machined on the inner surface of the static pressure guide sleeve, smooth curves are arranged around the oval oil cavities, the liquid resistance can be obviously reduced, the 4 static pressure guide sleeve oil cavities (6) are uniformly distributed on the inner surface of the static pressure guide sleeve (5), a static pressure guide sleeve oil inlet (7) is formed in the oval circle center of the oval oil cavity, 2 static pressure guide sleeve oil discharging grooves (8) are machined at the two ends of the static pressure guide sleeve, and a static pressure guide sleeve oil outlet (11) is machined in the same direction of the static pressure guide sleeve oil discharging grooves; the cylinder body (3) is made of medium carbon steel, an oil cavity of the hydraulic cylinder is processed on the inner surface of the cylinder body, the oil cavity is in clearance fit with the static pressure piston, and the cylinder body is in threaded connection with the static pressure guide sleeve.
The clearance between the piston and the inner surface of the cylinder body and the clearance between the piston rod and the guide sleeve are 20 mu m.
The beneficial effects are that the utility model discloses obviously reduce the frictional force that traditional pneumatic cylinder adopted the sealing washer to seal and produce, make and realize the self-lubricating between each contact surface of pneumatic cylinder, improve the low friction performance of pneumatic cylinder, increase the working life of pneumatic cylinder.
Drawings
For ease of illustration, the invention is described in detail by the following detailed description and accompanying drawings.
Fig. 1 is a schematic structural view of a hydraulic cylinder. In the figure: the hydraulic cylinder comprises a hydraulic cylinder oil inlet 1, a static pressure piston 2, a cylinder body 3, a hydraulic cylinder oil outlet 4, a static pressure guide sleeve 5, a static pressure guide sleeve oil cavity 6, a static pressure guide sleeve oil inlet 7, a static pressure guide sleeve oil discharge groove 8, a piston rod 9, a dust ring 10, a static pressure guide sleeve oil outlet 11, a hydraulic cylinder rod oil cavity 12, a piston rod oil inlet 13, a piston rod oil outlet 14, a static pressure piston oil outlet 15, a static pressure piston oil discharge groove 16, a static pressure piston oil inlet 17, a static pressure piston oil cavity 18 and a hydraulic cylinder rodless oil cavity 19.
Fig. 2 is a schematic structural view of a hydrostatic piston.
Fig. 3 is a schematic structural view of the static pressure guide sleeve.
Fig. 4 is a schematic view of the outer surface of a hydrostatic piston deployed. In the figure: 1. the oil-discharging device comprises an oil inlet, 2, an oil sealing edge, 3, an oil outlet, 4, a static pressure oil cavity, 5 and an oil discharging groove.
Fig. 5 is a partial cross-sectional view of a hydrostatic piston.
Fig. 6 is a schematic view of a hydrostatic bearing.
Fig. 7 is a schematic view of the working principle of the oil supply system of the hydrostatic bearing. In the figure: the hydraulic system comprises an oil tank 1, an overflow valve 2, a hydraulic pump 3, a motor 4, a check valve 5, an oil filter 6, an energy accumulator 7, a pressure gauge 8, a variable throttle valve 9 and a static pressure supporting structure 10.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described below with reference to specific embodiments shown in the accompanying drawings. It should be understood that the description is intended to be illustrative only and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
The structure of the utility model is shown in figure 1, figure 2, figure 3, figure 4 and figure 5. The utility model relates to an anti-unbalance loading static pressure supporting sealing hydraulic cylinder, which is characterized by comprising a static pressure piston (2), a cylinder body (3), a static pressure guide sleeve (5), a piston rod (9) and a dustproof ring (10); the dustproof ring (10) is made of rubber, is low in price and is in a trapezoidal structure, so that the dustproof ring can be better attached to the piston rod (9) and plays a better dustproof role; the static pressure piston (2) is made of No. 45 steel, 4 elliptical static pressure piston oil cavities (18) are machined on the outer surface of the static pressure piston, smooth curves are arranged on the peripheries of the elliptical oil cavities, liquid resistance can be obviously reduced, the 4 static pressure piston oil cavities (18) are uniformly distributed on the outer surface of the static pressure piston (2), a static pressure piston oil inlet (17) is formed in the center of an ellipse of each elliptical oil cavity, 2 static pressure piston oil discharge grooves (16) are machined at two ends of each piston, static pressure piston oil outlets (15) are machined in the same direction of the two static pressure piston oil discharge grooves, and the machining angles of 45 degrees are kept between the static pressure piston oil inlets and the static pressure; the piston rod (9) is made of low-carbon steel, the surface of the piston rod is treated to be rough by a grinding machine finally, a piston rod oil inlet (13) is formed in the center of the end face and is communicated with a static pressure piston oil inlet (17), a piston rod oil outlet (14) is machined below the piston rod oil inlet (13) and is communicated with a static pressure piston oil outlet (15); the material of the static pressure guide sleeve (5) is No. 45 steel, 4 oval static pressure guide sleeve oil cavities (6) are machined on the inner surface of the static pressure guide sleeve, smooth curves are arranged around the oval oil cavities, the liquid resistance can be obviously reduced, the 4 static pressure guide sleeve oil cavities (6) are uniformly distributed on the inner surface of the static pressure guide sleeve (5), a static pressure guide sleeve oil inlet (7) is formed in the oval circle center of the oval oil cavity, 2 static pressure guide sleeve oil discharging grooves (8) are machined at the two ends of the static pressure guide sleeve, and a static pressure guide sleeve oil outlet (11) is machined in the same direction of the static pressure guide sleeve oil discharging grooves; the cylinder body (3) is made of medium carbon steel, an oil cavity of the hydraulic cylinder is processed on the inner surface of the cylinder body, the oil cavity is in clearance fit with the static pressure piston, and the cylinder body is in threaded connection with the static pressure guide sleeve.
The utility model discloses an operating principle is as shown in figure 7, and before system work, overflow valve (2) are in the off-load state, and motor (4) start-up back, and hydraulic pump (3) begin the fuel feeding, and after the fuel feeding pressure of hydraulic pump is stable, the pressure of setting the overflow valve is a little higher than operating pressure, and hydraulic oil is through check valve (5), oil filter (6), and variable choke valve (9) begin to supply oil to the hydrostatic system. Hydraulic oil flows into a piston oil inlet from an oil inlet hole of the piston rod and enters a piston oil cavity, when certain pressure is reached, the hydraulic oil flows to an oil sealing edge to form a static pressure oil film, flows into a piston oil discharge groove, flows from a piston oil outlet to a piston rod oil outlet and returns to an oil tank (1) to complete working circulation; the hydraulic oil flows into the oil cavity of the guide sleeve from the oil inlet hole of the guide sleeve, when a certain pressure is reached, the hydraulic oil flows to the oil sealing edge to form a static pressure oil film, flows into the oil discharging groove of the guide sleeve, and flows back to the oil tank (1) from the oil outlet of the guide sleeve to complete the working cycle.
After hydraulic oil flows into the static pressure oil cavity, the static pressure oil cavity can be filled with the hydraulic oil firstly, after certain pressure is reached, the hydraulic oil flows to an oil sealing edge to form a very thin oil film, at the moment, the hydraulic cylinder starts to work, the piston rod reciprocates, liquid lubrication is realized between the piston and the inner surface of the cylinder body and between the piston and the guide sleeve under the action of the oil film, the hydraulic cylinder is also called as liquid friction, compared with the solid friction of the traditional hydraulic cylinder, the static pressure sealing hydraulic cylinder can realize self-lubrication, the friction force is effectively reduced, the low friction performance of the hydraulic cylinder is improved, and the service life.
The basic principles and the main features of the invention and the advantages of the invention have been shown and described above. It should be understood by those skilled in the art that the present invention is not limited by the foregoing description, and what has been described in the foregoing description is illustrative only, and that various changes and modifications may be made without departing from the spirit and scope of the invention, and these changes and modifications are intended to fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. A static pressure sealing low-friction hydraulic cylinder with an oval oil cavity is characterized by comprising a static pressure piston (2), a cylinder body (3), a static pressure guide sleeve (5), a piston rod (9) and a dust ring (10); the dustproof ring (10) is made of rubber, is low in price and is in a trapezoidal structure, and the piston rod (9) can be better attached to the dustproof ring to achieve a better dustproof effect.
2. The hydrostatic sealing low-friction hydraulic cylinder with the oval oil chambers as claimed in claim 1, wherein the hydrostatic piston (2) is made of No. 45 steel, 4 oval hydrostatic piston oil chambers (18) are machined on the outer surface of the hydrostatic piston, smooth curves are arranged around the oval oil chambers, the hydraulic resistance can be obviously reduced, the 4 hydrostatic piston oil chambers (18) are uniformly distributed on the outer surface of the hydrostatic piston (2), a hydrostatic piston oil inlet (17) is formed in the center of an oval circle of the oval oil chamber, 2 hydrostatic piston oil discharge grooves (16) are machined at two ends of the piston, hydrostatic piston oil outlets (15) are machined in the same direction of the two hydrostatic piston oil discharge grooves, and the hydrostatic piston oil inlets and the hydrostatic piston oil outlets keep a machining angle of 45 degrees.
3. The hydrostatic sealing low-friction hydraulic cylinder with the oval oil cavity as claimed in claim 1, wherein the piston rod (9) is made of low carbon steel, the surface of the piston rod is treated with roughness by a grinding machine, a piston rod oil inlet (13) is formed in the center of the circle of the end surface and communicated with a hydrostatic piston oil inlet (17), and a piston rod oil outlet (14) is formed below the piston rod oil inlet (13) and communicated with a hydrostatic piston oil outlet (15).
4. The hydrostatic sealing low-friction hydraulic cylinder with the oval oil cavity as claimed in claim 1, wherein the hydrostatic guide sleeve (5) is made of No. 45 steel, 4 oval hydrostatic guide sleeve oil cavities (6) are machined on the inner surface of the hydrostatic guide sleeve, smooth curves are arranged around the oval oil cavities, the hydraulic resistance can be obviously reduced, the 4 hydrostatic guide sleeve oil cavities (6) are uniformly distributed on the inner surface of the hydrostatic guide sleeve (5), a hydrostatic guide sleeve oil inlet (7) is arranged at the center of an oval circle of the oval oil cavity, 2 hydrostatic guide sleeve oil discharge grooves (8) are machined at two ends of the hydrostatic guide sleeve, and a hydrostatic guide sleeve oil outlet (11) is machined in the same direction of the hydrostatic guide sleeve oil discharge grooves.
5. The hydrostatic sealing low-friction hydraulic cylinder with the oval oil cavity as claimed in claim 1, wherein the cylinder body (3) is made of medium carbon steel, the oil cavity of the hydraulic cylinder is machined on the inner surface of the cylinder body, the oil cavity is in clearance fit with the hydrostatic piston, and the cylinder body is in threaded connection with the hydrostatic guide sleeve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920278629.0U CN209875606U (en) | 2019-03-06 | 2019-03-06 | Static-pressure sealing low-friction hydraulic cylinder with oval oil cavity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920278629.0U CN209875606U (en) | 2019-03-06 | 2019-03-06 | Static-pressure sealing low-friction hydraulic cylinder with oval oil cavity |
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| Publication Number | Publication Date |
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| CN209875606U true CN209875606U (en) | 2019-12-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920278629.0U Expired - Fee Related CN209875606U (en) | 2019-03-06 | 2019-03-06 | Static-pressure sealing low-friction hydraulic cylinder with oval oil cavity |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109764022A (en) * | 2019-03-06 | 2019-05-17 | 哈尔滨理工大学 | A kind of hydrostatic seal low friction hydraulic cylinder of ellipse oil pocket |
-
2019
- 2019-03-06 CN CN201920278629.0U patent/CN209875606U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109764022A (en) * | 2019-03-06 | 2019-05-17 | 哈尔滨理工大学 | A kind of hydrostatic seal low friction hydraulic cylinder of ellipse oil pocket |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20191231 Termination date: 20210306 |
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| CF01 | Termination of patent right due to non-payment of annual fee |