CN111677714A - A piston structure for high pressure and low friction hydraulic cylinder - Google Patents

Abstract

The invention discloses a piston structure for a high-pressure and low-friction hydraulic cylinder. The first oil hole on the inner side wall of the cylinder barrel and the second oil hole on the inner side wall of the cylinder barrel are arranged obliquely below the oil hole. In the present invention, when the piston runs downward and upward and the second piston ring is located between the oil hole 1 and the oil hole 2 of the oil storage hole, the piston rings have a sealing effect together, and when the piston runs downward and upward and the second piston ring is not located in the oil storage hole Between oil hole 1 and oil hole 2, piston ring 1 and piston ring 2 work together to seal, and the piston runs up and down to generate pressure and suction, so that hydraulic oil flows between seal ring 1 and seal ring 2. The oil film reduces the friction between the piston and the cylinder, and the pressure and suction are generated during the operation of the piston, so that the hydraulic oil flows between the sealing ring 1 and the sealing ring 2 to generate an oil film, reducing the friction between the piston and the cylinder. .

Description

A piston structure for high pressure and low friction hydraulic cylinder

technical field

The invention relates to the technical field of pistons of high-pressure and low-friction hydraulic cylinders, in particular to a piston structure for high-pressure and low-friction hydraulic cylinders.

Background technique

A hydraulic cylinder is a hydraulic actuator that converts hydraulic energy into mechanical energy and performs linear reciprocating motion (or swing motion). It has simple structure and reliable operation. When using it to achieve reciprocating motion, the reduction device can be omitted, and there is no transmission gap, and the movement is stable, so it is widely used in various mechanical hydraulic systems. The output force of the hydraulic cylinder is proportional to the effective area of the piston and the pressure difference on both sides; the hydraulic cylinder is basically composed of a cylinder barrel and a cylinder head, a piston and a piston rod, a sealing device, a buffer device and an exhaust device, and the buffer device and the exhaust device are composed. Depending on the application, other devices are necessary.

At present, in some high-pressure and low-friction hydraulic cylinders, in order to reduce friction, a constant gap seal is used between the piston and the cylinder, but this seal cannot completely prevent leakage due to the existence of a gap, so the sealing performance is poor, which affects the use. If the fit between the cylinders is too tight, the oil film between the piston and the inner wall of the cylinder will be destroyed, which will increase the friction force.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a piston structure for a high-pressure low-friction hydraulic cylinder to solve the above-mentioned problems in the background art.

In order to achieve the above purpose, the present invention provides the following technical solutions: a piston structure for a high-pressure low-friction hydraulic cylinder, comprising a cylinder barrel and a piston slidably arranged inside the cylinder barrel, and the inner sidewall of the cylinder barrel is evenly provided with oil storage. The oil storage hole includes an oil hole 1 obliquely arranged on the inner side wall of the cylinder barrel and an oil hole 2 obliquely arranged below the oil hole on the inner side wall of the cylinder barrel. The bottom end of the oil hole 1 and the oil hole 2 The bottom ends are communicated with each other, the outer side of the piston is provided with a first and second clamping grooves from top to bottom, and the first and second clamping grooves are respectively provided with a piston ring 1 and a piston ring 2. The piston ring 1 The height of the second piston ring is greater than the distance from the top end of the first oil hole to the top end of the second oil hole, and 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.

Preferably, the outer sidewall of the piston between the first piston ring and the second piston ring is provided with a helical channel.

Preferably, the outer side of the bottom end of the piston is provided with an annular cutout, and the annular cutout is inclined toward the outside of the piston.

Preferably, an annular oil storage cavity is formed between the outer side of the piston and the cylinder between the first piston ring and the second piston ring.

Preferably, the first locking groove matches the first piston ring, and the second locking groove matches the second piston ring.

Preferably, the downward inclination angle of the oil hole is 60 degrees.

Preferably, the downward inclination angle of the second oil hole is 30 degrees.

Compared with the prior art, the beneficial effects of the present invention are:

(1) In the present invention, oil storage holes are evenly arranged on the inner side wall of the cylinder barrel. The oil storage holes include an oil hole 1 obliquely arranged on the inner side wall of the cylinder barrel and an oil hole 2 obliquely arranged on the inner side wall of the cylinder barrel below the oil hole. , the bottom end of oil hole 1 is connected with the bottom end of oil hole 2, and the oil storage hole stores a small amount of oil during the up and down operation of the piston, which reduces the friction between the piston and the cylinder, and reduces the up and down movement of the piston. The load increases the service life of the piston and the cylinder, and because the oil hole 1 and the oil hole 2 of the oil storage hole are inclined downward, the oil inside the oil storage hole is prevented from leaking out.

(2) In the present invention, the first and second clamping grooves are respectively provided on the outside of the piston from top to bottom, and the first and second clamping grooves are respectively provided with a piston ring 1 and a piston ring 2, so that the sealing is not affected. , reduce the contact area between the piston and the cylinder, and further reduce the friction between the piston and the cylinder.

(3) The height of piston ring 1 of the present invention is greater than the distance from the top of oil hole 1 to the top of oil hole 2, and the height of piston ring 2 is smaller than the distance from the top of oil hole 1 to the top of oil hole 2. When the piston runs downward and piston ring 2 When it is located between the oil hole 1 and the oil hole 2 of the oil storage hole, the piston generates pressure on the hydraulic oil under the cylinder, so that a small amount of hydraulic oil enters the piston ring 1 and the piston ring through the oil hole 2 and oil hole 1 of the oil storage hole. Between the first and second piston rings, an upward moving oil film is formed between the outer side of the piston and the cylinder between the first and second piston rings, which further reduces the friction between the entire piston and the cylinder. Under the action of pressure, the oil storage hole in one place applies oil to the first surface of the piston ring, so that an oil film is formed on the first surface of the piston ring, and the piston runs upwards and the piston ring 2 is located between the oil hole 1 and the oil hole 2 of the oil storage hole. When the cylinder below the piston generates negative pressure, the hydraulic oil located between the piston ring 1 and the piston ring 2 and the hydraulic oil in the oil hole 2 and the oil hole 1 of the oil storage hole between the piston ring 1 and the hydraulic oil in the oil hole 1 pass through the storage tank located at the piston ring 2. The oil hole 1 and oil hole 2 of the oil hole are discharged into the cylinder barrel below the piston, so that a downward moving oil film is formed between the outer side of the piston and the cylinder barrel between the piston ring 1 and the piston ring 2, which further reduces the overall relationship between the piston and the cylinder. The friction between the cylinders, when the piston runs downwards and upwards and the second piston ring is located between the oil hole one and the second oil hole of the oil storage hole, the piston rings seal together, and when the piston runs downwards and upwards and the second piston ring When it is not located between the oil hole 1 and the oil hole 2 of the oil storage hole, the piston ring 1 and the piston ring 2 jointly play a sealing role. The present invention generates pressure and suction during the operation of the piston, so that the hydraulic oil is in the sealing ring 1 and the sealing ring. The flow between the two seal rings produces an oil film, which reduces the friction between the piston and the cylinder.

Description of drawings

Fig. 1 is the structural representation of the present invention;

Fig. 2 is the partial structure schematic diagram of A place of Fig. 1;

Figure 3 is a schematic diagram of the structure of the piston of the present invention

FIG. 4 is a schematic structural diagram of the piston, the first sealing ring and the second sealing ring of the present invention.

In the figure: 1. Spiral channel; 2. Oil storage hole; 21. Oil hole 1; 22. Oil hole 2; 3. Piston; 31. Card slot 1; Ring one; 5. Cylinder barrel; 6. Piston ring two.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

1-4, an embodiment provided by the present invention: a piston structure for a high-pressure low-friction hydraulic cylinder, comprising a cylinder 5 and a piston 3 slidably arranged inside the cylinder 5, the inner side of the cylinder 5 The wall is evenly provided with oil storage holes 2. The oil storage holes 2 include an oil hole one 21 obliquely arranged on the inner side wall of the cylinder barrel 5 and an oil hole two 22 arranged obliquely on the inner side wall of the cylinder barrel 5 below the oil hole one 21. The bottom end of the first 21 and the bottom end of the second oil hole 22 communicate with each other. The downward inclination angle of the oil hole one 21 is 60 degrees, and the downward inclination angle of the oil hole two 22 is 30 degrees. The first card slot 31 and the second card groove 32, and the first card groove 31 and the second card groove 32 are respectively provided with a piston ring one 4 and a piston ring two 6, the card groove one 31 and the piston ring one 4 are matched with each other, and the card groove two 32 and piston ring two 6 match each other, the height of piston ring one 4 is greater than the distance from the top of oil hole one 21 to the top of oil hole two 22, and the height of piston ring two 6 is smaller than the distance from the top of oil hole one 21 to the top of oil hole two 22 , the outer side wall of the piston 3 between the piston ring one 4 and the piston ring two 6 is provided with a spiral channel 1, and an annular oil storage cavity is formed between the outer side of the piston 3 between the piston ring one 4 and the piston ring two 6 and the cylinder 5, An annular cutout 33 is provided on the outer side of the bottom end of the piston 3 , and the annular cutout 33 is inclined toward the outside of the piston 3 .

Working principle: When applied, when the piston 3 runs downward and the piston ring 2 6 is located between the oil hole 1 21 and the oil hole 2 22 of the oil storage hole 2, the piston 3 generates pressure on the hydraulic oil inside the lower cylinder 5, Make a small amount of hydraulic oil enter 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, so that the outer side of the piston 3 between the piston ring one 6 and the piston ring two 4 is connected to the cylinder. An upward moving oil film is formed between the cylinders 5, which reduces the friction between the entire piston 3 and the cylinder 5. At the same time, during this process, the oil storage hole 2 located at the piston ring 1 4 is under the action of pressure. Apply oil on the surface of the first 4, so that an oil film is formed on the surface of the piston ring 1 4. When the piston 3 runs upward and the piston ring 2 6 is located between the oil hole 1 21 and the oil hole 22 of the oil storage hole 2, the cylinder below the piston 3 5. Negative pressure is generated inside, the hydraulic oil located between the first piston ring 4 and the second piston ring 6 and the hydraulic oil in the oil hole 222 of the oil storage hole 2 and the oil hole 21 of the oil storage hole 2 between the piston ring 2 and the hydraulic oil in the oil hole 21 of the oil storage hole 2 pass through the reservoir located at the second piston ring 6. The oil hole 1 21 and the oil hole 2 22 of the oil 2 are discharged into the cylinder 5 below the piston 3, so that a downward movement is formed between the outer side of the piston 3 and the cylinder 5 between the piston ring 1 4 and the piston ring 2 6. The oil film reduces the friction between the entire piston 4 and the cylinder 5. When the piston 3 runs downward and upward and the piston ring 2 6 is located between the oil hole 1 21 and the oil hole 22 of the oil storage hole 2, the piston ring 1 4 plays a sealing role, and when the piston 3 runs downward and upward and the piston ring 2 6 is not located between the oil hole 1 21 and the oil hole 222 of the oil storage hole 2, the piston ring 1 4 and the piston ring 2 6 together play a role. For the sealing effect, the present invention generates pressure and suction during the operation of the piston, so that the hydraulic oil flows between the first seal ring and the second seal ring to generate an oil film, thereby reducing the friction between the piston and the cylinder.

Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, it is still possible to modify the technical solutions described in the foregoing embodiments, or to perform equivalent replacements for some of the technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims (7)

1. A piston structure for a high-pressure low-friction hydraulic cylinder, comprising a cylinder (5) and a piston (3) slidably arranged inside the cylinder (5), characterized in that: the inner side of the cylinder (5) The wall is evenly provided with oil storage holes (2), the oil storage holes (2) include an oil hole one (21) obliquely arranged on the inner side wall of the cylinder barrel (5) and an oil hole one (21) obliquely arranged below the oil hole one (21) in the cylinder The second oil hole (22) on the inner side wall of the cylinder (5), the bottom end of the first oil hole (21) and the bottom end of the second oil hole (22) communicate with each other, and the outer side of the piston (3) is respectively from top to bottom A card slot one (31) and a second card slot (32) are provided, and a piston ring one (4) and a piston ring two (6) are respectively arranged inside the card slot one (31) and the card slot two (32). The height of the piston ring 1 (4) is greater than the distance from the top of the oil hole 1 (21) to the top of the oil hole 2 (22), and the height of the piston ring 2 (6) is smaller than the top of the oil hole 1 (21) to the oil hole 2. (22) Distance from tip. 2. The soil remediation sampling device according to claim 1, characterized in that: the outer side wall of the piston (3) between the piston ring one (4) and the piston ring two (6) is provided with a spiral channel (1) . 3 . The sampling device for soil restoration according to claim 1 , wherein an annular cutout (33) is provided on the outer side of the bottom end of the piston (3), and the annular cutout (33) is inclined toward the outside of the piston (3). 4 . 4. The soil remediation sampling device according to claim 1, characterized in that: between the outer side of the piston (3) and the cylinder (5) between the first piston ring (4) and the second piston ring (6) An annular oil reservoir is formed. 5. The sampling device for soil remediation according to claim 1, characterized in that: the first snap groove (31) is matched with the piston ring one (4), and the snap groove two (32) is matched with the piston ring two (4). 6) Match each other. 6. The sampling device for soil remediation according to claim 1, wherein the downward inclination angle of the oil hole one (21) is 60 degrees. 7. The sampling device for soil remediation according to claim 2, characterized in that: the downward inclination angle of the second oil hole (22) is 30 degrees.

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