CN212615707U

CN212615707U - Hydraulic cylinder

Info

Publication number: CN212615707U
Application number: CN202021282040.7U
Authority: CN
Inventors: 苗国华; 迟峰; 王永; 刘淑强
Original assignee: Shandong Lingong Construction Machinery Co Ltd
Current assignee: Shandong Lingong Construction Machinery Co Ltd
Priority date: 2020-07-02
Filing date: 2020-07-02
Publication date: 2021-02-26
Anticipated expiration: 2030-07-02

Abstract

The utility model relates to the technical field of hydraulic pressure, in particular to a hydraulic cylinder, which comprises a cylinder body, a cylinder barrel and a cylinder head which are integrally formed, wherein one end of the cylinder body is provided with an opening, one end of the cylinder body, which is far away from the opening, is provided with an end cover, and one section of the cylinder body is a static pressure supporting section; the piston comprises a piston body and a piston rod which are integrally formed; the piston penetrates through the cylinder body, one end of the piston extends out relative to the cylinder body, and the piston can reciprocate along the axial direction of the cylinder body under the pushing of hydraulic oil; the oil inlets are arranged on the cylinder body at intervals along the circumferential direction of the cylinder body; and the oil storage grooves are communicated with the oil inlets in a one-to-one correspondence manner and are arranged on the inner wall of the static pressure supporting section at intervals along the circumferential direction of the static pressure supporting section. The utility model discloses can reduce the inefficacy of sealing member, reduce the processing degree of difficulty of pneumatic cylinder simultaneously, guarantee to satisfy between piston and the cylinder body sealed and static pressure support requirement.

Description

Hydraulic cylinder

Technical Field

The utility model relates to the field of hydraulic techniques, especially, relate to a pneumatic cylinder.

Background

The hydraulic cylinder mainly acts on the load driven by the reciprocating motion under the action of hydraulic oil, conventional contact type dynamic seals (such as an excavator oil cylinder, a loader oil cylinder and the like) are adopted between a piston and a cylinder barrel and between a piston rod and a cylinder head in the hydraulic cylinder, the sealing effect is good, the requirements on the processing and manufacturing precision of related parts are not high, but the friction force of the sealing mode is large, and the sealing part lip is easy to generate high temperature and fatigue failure during high-speed motion, so that the hydraulic oil leakage is caused.

In addition, in the prior art, in order to reduce leakage of hydraulic oil, besides strict requirements on a fit clearance between a piston and a cylinder body, the strict requirements on the fit clearance between the piston (piston rod) and a cylinder head are also met, and meanwhile, the strict requirements on the fit of the cylinder head and the cylinder barrel are also met, so that the related fit is caused to be multiple, the dimensional requirements, the coaxiality and the cylindricity precision of each part are high, the processing is not easy to guarantee, and the fit clearance between the piston (piston rod) and the cylinder barrel cannot achieve the sealing and static pressure supporting effects due to the size and the shape and position precision of a certain part.

Therefore, a hydraulic cylinder is needed to solve the above technical problems.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a pneumatic cylinder can reduce the inefficacy of sealing member, reduces the processing degree of difficulty of pneumatic cylinder simultaneously, guarantees to satisfy between piston and the cylinder body sealed and static pressure support requirement.

To achieve the purpose, the utility model adopts the following technical proposal:

1. a hydraulic cylinder, comprising:

the cylinder body comprises a cylinder barrel and a cylinder head which are integrally formed, an opening is formed in one end of the cylinder body, an end cover is arranged at one end, away from the opening, of the cylinder body, and one section of the cylinder body is a static pressure supporting section;

the piston comprises a piston body and a piston rod which are integrally formed; the piston penetrates through the cylinder body, one end of the piston extends out relative to the cylinder body, and the piston can reciprocate along the axial direction of the cylinder body under the pushing of hydraulic oil;

the oil inlets are arranged on the cylinder body at intervals along the circumferential direction of the cylinder body;

the oil storage grooves are communicated with the oil inlets in a one-to-one correspondence mode and are arranged on the inner wall of the static pressure supporting section at intervals along the circumferential direction of the static pressure supporting section;

the oil reservoir is configured to: and hydraulic oil enters the oil storage tank from the oil inlet, so that the hydraulic oil accumulated in the oil storage tank provides static pressure support for the piston rod.

Optionally, a plurality of throttling holes are formed in the cylinder body, the throttling holes are arranged in one-to-one correspondence with the oil inlets, one end of each throttling hole is communicated with the oil inlet, and the other end of each throttling hole is communicated with the oil storage tank.

Optionally, the cylinder body has an open end and a first sealing installation groove is formed in the inner wall of the cylinder body, and a first sealing ring is arranged in the first sealing installation groove.

Optionally, the cylinder block is provided with a plurality of first oil return holes, and the first oil return holes are communicated with the first seal mounting groove and used for discharging the hydraulic oil accumulated in the first seal mounting groove.

Optionally, a plurality of second oil return holes are formed in the static pressure supporting section of the cylinder body.

Optionally, the cylinder body has an open end in a dustproof mounting groove is opened on the inner wall of the cylinder body, and a dustproof ring is arranged in the dustproof mounting groove.

Optionally, a first oil inlet and outlet is formed in the end cover, a second oil inlet and outlet is formed in the cylinder body, and the piston body is located between the first oil inlet and outlet and the second oil inlet and outlet.

Optionally, a second sealing installation groove is formed in the end cover, and a second sealing ring is arranged in the second sealing installation groove.

Optionally, a plurality of buffer grooves are formed at intervals at one end of the piston rod, which is far away from the cylinder head, along the circumferential direction of the piston rod.

Optionally, the piston body is provided with a pressure equalizing groove.

The utility model has the advantages that:

the cylinder barrel and the cylinder head are integrally formed to form the cylinder body, the piston penetrates through the cylinder body and can reciprocate along the circumferential direction of the cylinder body, and the cylinder barrel and the cylinder head are integrally formed to form the cylinder body, so that the related assembly is reduced, and the processing and assembling difficulty is reduced; the hydraulic cylinder is characterized in that the cylinder body is provided with a plurality of oil inlets and an oil storage tank communicated with the oil inlets, hydraulic oil enters the oil storage tank from the oil inlets, so that the hydraulic oil stored in the oil storage tank provides static pressure support for the piston, abrasion to the sealing ring in reciprocating motion of the piston is reduced, sealing between the piston and the cylinder body is guaranteed, and effective work of the hydraulic cylinder is guaranteed.

Drawings

Fig. 1 is a schematic view of a hydraulic cylinder according to the present invention;

fig. 2 is a front view of a hydraulic cylinder according to the present invention;

FIG. 3 is a cross-sectional view A-A of FIG. 2;

FIG. 4 is an enlarged view of a portion of FIG. 3 at B;

fig. 5 is a cross-sectional view of a hydraulic cylinder of the present invention;

fig. 6 is a schematic diagram of a piston in a hydraulic cylinder according to the present invention.

In the figure:

1. a cylinder body; 11. a cylinder barrel; 12. a cylinder head; 121. an oil inlet; 122. an orifice; 123. an oil storage tank; 13. a first oil return hole; 14. a second oil return hole; 15. connecting holes; 16. a first seal ring; 17. a dust ring; 2. a piston; 21. a buffer tank; 22. a pressure equalizing groove; 3. an end cap; 31. a first oil inlet and outlet; 32. a second seal ring; 4. and the second oil inlet and outlet.

Detailed Description

The technical solution of the present invention will be further explained with reference to the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the elements related to the present invention are shown in the drawings.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection or a removable connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In order to reduce the failure of a sealing element and simultaneously reduce the processing difficulty of the hydraulic cylinder and ensure that the sealing and static pressure supporting requirements between the piston and the cylinder body are met, as shown in figures 1-6, the utility model provides a hydraulic cylinder, which comprises a cylinder body 1 and a piston 2; the cylinder body 1 comprises a cylinder barrel 11 and a cylinder head 12 which are integrally formed, one end of the cylinder body 1 is provided with an opening, one end, far away from the opening, of the cylinder body 1 is provided with an end cover 3, and one section of the cylinder body 1 is a static pressure supporting section; the piston 2 comprises a piston body and a piston rod which are integrally formed, the piston 2 penetrates through the cylinder body 1, one end of the piston extends out relative to the cylinder body 1, and the piston can reciprocate along the axial direction of the cylinder body 1 under the pushing of hydraulic oil; a plurality of oil inlets 121 and a plurality of oil storage grooves 123 are formed in the cylinder body 1, wherein the plurality of oil inlets 121 are formed in the cylinder body 1 at intervals along the circumferential direction of the cylinder body 1; the oil storage grooves 123 are communicated with the oil inlets 121 in a one-to-one correspondence manner and are arranged on the inner wall of the static pressure supporting section at intervals along the circumferential direction of the static pressure supporting section; the oil reservoir 123 is configured such that hydraulic oil enters the oil reservoir 123 from the oil inlet 121, so that the hydraulic oil accumulated in the oil reservoir 123 provides static pressure support to the piston rod of the piston 2.

The cylinder barrel 11 and the cylinder head 12 are integrally formed to form the cylinder body 1, the piston 2 penetrates through the cylinder body 1 and can reciprocate along the circumferential direction of the cylinder body 1, and the cylinder barrel 11 and the cylinder head 12 are integrally formed to form the cylinder body 1, so that the related assembly is reduced, and the difficulty of processing and assembly is reduced; the cylinder body 1 is provided with the oil inlets 121 and the oil storage groove 123 communicated with the oil inlets 121, hydraulic oil enters the oil storage groove 123 from the oil inlets 121, so that the hydraulic oil stored in the oil storage groove 123 provides static pressure support for the piston 2, abrasion to the sealing ring in reciprocating motion of the piston 2 is reduced, sealing between the piston 2 and the cylinder body 1 is guaranteed, and effective work of the hydraulic cylinder is guaranteed.

Furthermore, a plurality of throttle holes 122 are formed in the cylinder block 1, the throttle holes 122 are arranged in one-to-one correspondence with the oil inlets 121, one end of each throttle hole 122 is communicated with the oil inlet 121, and the other end of each throttle hole 122 is communicated with the oil storage tank 123. The throttle hole 122 is provided to throttle the hydraulic oil flowing into the oil reservoir 123 through the oil inlet 121. Hydraulic oil enters the oil storage groove 123 through the oil inlet 121 and the throttling hole 122, an annular gap is formed between the oil storage groove 123 and the piston 2, an annular throttling loop is formed in the annular gap after the hydraulic oil enters the oil storage groove 123, the hydraulic oil gathers pressure in the oil storage groove 123 and provides static pressure support for the piston 2, friction between the piston 2 and a sealing ring is effectively reduced, high-temperature deformation and abrasion of the sealing ring due to frequent friction are prevented, and the service life of the sealing ring is prolonged.

Further, the cylinder body 1 has an open end and a first sealing installation groove is formed on the inner wall of the cylinder body 1, and a first sealing ring 16 is arranged in the first sealing installation groove. The first sealing ring 16 prevents the hydraulic oil from flowing out through the gap between the cylinder 1 and the piston 2. Specifically, in the present embodiment, the first seal ring 16 includes a teflon ring and an O-ring, the teflon ring is disposed between the O-ring and the piston 2, and the low friction characteristic of the teflon ring is utilized to reduce the frictional resistance.

Further, a plurality of first oil return holes 13 are formed in the cylinder block 1, and the first oil return holes 13 are communicated with the first seal mounting groove and used for discharging hydraulic oil accumulated in the first seal mounting groove. Thereby prevent that the hydraulic oil that leaks from gathering in first seal installation groove, lead to the pressure of the hydraulic oil in the first seal installation groove to rise, cause the hydraulic oil to leak.

Furthermore, a plurality of second oil return holes 14 are formed in the static pressure support section, and the first oil return holes 14 are used for discharging the leaked hydraulic oil in the oil storage groove 123 and the hydraulic oil brought by the piston rod. Specifically, in this embodiment, a connection hole 15 is formed in the cylinder block 1, the connection hole 15 is respectively communicated with the first oil return hole 13 and the second oil return hole 14, the connection hole 15 is communicated with the oil tank, and the hydraulic oil leaked from the oil storage tank 123 and the hydraulic oil brought out by the piston rod are returned to the oil tank through the first oil return hole 13, the second oil return hole 14 and the connection hole 15.

Further, cylinder body 1 has the open-ended one end and has seted up dustproof mounting groove on 1 inner walls of cylinder body, is provided with dust ring 17 in dustproof mounting groove. Through setting up dust ring 17 can block the dust or other impurity that piston 2 brought in the motion process, avoid causing the fish tail to the inner wall of cylinder body 1.

Furthermore, a first oil inlet and outlet 31 is formed in the end cover 3, the end cover 3 is arranged at one end of the cylinder barrel 11 far away from the cylinder head 12, a second oil inlet and outlet 4 is formed in the cylinder body 1, and the piston body is located between the first oil inlet and outlet 31 and the second oil inlet and outlet 4. The piston 2 is extended by discharging oil from the second oil inlet/outlet port 4 by feeding oil from the first oil inlet/outlet port 31, and the piston 2 is retracted by discharging oil from the first oil inlet/outlet port 31 by feeding oil from the second oil inlet/outlet port 4.

Furthermore, a second sealing installation groove is formed in the end cover 3, a second sealing ring 32 is arranged in the second sealing installation groove, sealing between the end cover 3 and the cylinder body 1 is achieved through the second sealing ring 32, and hydraulic oil is prevented from leaking out of the end cover 3 and the cylinder body 1.

Further, a plurality of buffer grooves 21 extending from the end portion are opened at an end of the piston 2 away from the cylinder head 12 in the circumferential direction of the piston 2. The throttling buffer is formed by the buffer groove 21, so that the impact of the hydraulic cylinder on the end cover 3 in high-speed motion is reduced, and the hydraulic cylinder can work stably.

Further, a pressure equalizing groove 22 is annularly arranged on the piston body. Make on the one hand to form the synovial membrane lubrication support between piston 2 and the cylinder body 1 through the pressure-equalizing groove 22, on the other hand can save the impurity that produces in the hydraulic cylinder working process, reduces the damage of impurity to piston 2 and cylinder body 1.

When hydraulic oil enters through the first oil inlet and outlet 31 of the end cover 3 to push the piston 2 to extend out, the hydraulic oil is discharged through the second oil inlet and outlet; through from the 4 oil intakes of second business turn over hydraulic fluid port, go out oil from first business turn over hydraulic fluid port 31 and make piston 2 retract, when piston 2 moved the hole of end cover 31, piston 2 formed annular throttle with the hole of end cover 3, formed gradually the throttle area that becomes with dashpot 21 simultaneously, formed the buffering, reduced the impact to end cover 3 when piston 2 was quick in the return stroke. The hydraulic oil leaks through the clearance between the piston 2 and the matching surface, a lubricating oil film is formed between the matching surfaces, and meanwhile, the hydraulic oil returns to the oil tank through the first oil return hole 13 and the second oil return hole 14.

It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A hydraulic cylinder, comprising:

the cylinder body (1) comprises a cylinder barrel (11) and a cylinder head (12) which are integrally formed, an opening is formed in one end of the cylinder body (1), an end cover (3) is arranged at one end, far away from the opening, of the cylinder body (1), and one section of the cylinder body (1) is a static pressure supporting section;

a piston (2) including an integrally formed piston body and a piston rod; the piston (2) penetrates through the cylinder body (1), one end of the piston extends out relative to the cylinder body (1), and the piston can reciprocate along the axial direction of the cylinder body (1) under the pushing of hydraulic oil;

the oil inlets (121) are arranged on the cylinder body (1) at intervals along the circumferential direction of the cylinder body (1);

the oil storage grooves (123) are communicated with the oil inlets (121) in a one-to-one correspondence mode and are arranged on the inner wall of the static pressure supporting section at intervals along the circumferential direction of the static pressure supporting section;

the oil reservoir (123) is configured to: hydraulic oil enters the oil storage groove (123) from the oil inlet (121), so that the hydraulic oil accumulated in the oil storage groove (123) provides static pressure support for the piston rod.

2. The hydraulic cylinder according to claim 1, wherein a plurality of throttle holes (122) are formed in the cylinder body (1), the throttle holes (122) are arranged in one-to-one correspondence with the oil inlets (121), one end of each throttle hole (122) is communicated with the oil inlet (121), and the other end of each throttle hole is communicated with the oil storage tank (123).

3. A hydraulic cylinder according to claim 1, characterized in that the open end of the cylinder body (1) has a first seal mounting groove formed in the inner wall of the cylinder body (1), and a first seal ring (16) is disposed in the first seal mounting groove.

4. A hydraulic cylinder according to claim 3, wherein a plurality of first oil return holes (13) are formed in the cylinder block (1), and the first oil return holes (13) communicate with the first seal mounting groove for discharging hydraulic oil accumulated in the first seal mounting groove.

5. A hydraulic cylinder according to claim 1, characterized in that the hydrostatic bearing section of the cylinder block (1) is provided with a plurality of second oil return holes (14).

6. A hydraulic cylinder according to claim 1, characterized in that the end of the cylinder body (1) having the opening is provided with a dust-proof mounting groove on the inner wall of the cylinder body (1), and a dust-proof ring (17) is provided in the dust-proof mounting groove.

7. The hydraulic cylinder according to claim 1, wherein the end cover (3) is provided with a first oil inlet/outlet (31), the cylinder body (1) is provided with a second oil inlet/outlet (4), and the piston body is located between the first oil inlet/outlet (31) and the second oil inlet/outlet (4).

8. A hydraulic cylinder according to claim 7, characterized in that the end cover (3) is provided with a second seal mounting groove in which a second sealing ring (32) is arranged.

9. A hydraulic cylinder according to claim 1, characterized in that a plurality of spaced-apart damping grooves (21) are provided along the circumference of the piston rod at the end of the piston rod remote from the cylinder head (12).

10. A hydraulic cylinder according to claim 1, characterized in that the piston body is provided with a pressure equalizing groove (22) around it.