CN212717472U

CN212717472U - Hydraulic oil cylinder

Info

Publication number: CN212717472U
Application number: CN202021364975.XU
Authority: CN
Inventors: 周春
Original assignee: Kunshan Qilit Oil Cylinder Hydraulic Equipment Co ltd
Current assignee: Kunshan Qilit Oil Cylinder Hydraulic Equipment Co ltd
Priority date: 2020-07-13
Filing date: 2020-07-13
Publication date: 2021-03-16
Anticipated expiration: 2030-07-13

Abstract

The utility model discloses a hydraulic cylinder, include: the piston type piston cylinder comprises a cylinder barrel, a piston rod, a piston and an end cover, wherein one end of the cylinder barrel is closed, the other end of the cylinder barrel is provided with an opening, and the interior of the cylinder barrel is hollow to form an accommodating cavity; the piston rod extends into the accommodating cavity from one end, and the piston is sleeved on one end of the piston rod; the end cover is sleeved on the piston rod and is fixedly arranged at the opening of the cylinder barrel; the internal perisporium of cylinder has the first internal perisporium and the second internal perisporium of internal diameter inequality, and first internal perisporium is inconsistent with the periphery wall of end cover to sealed through the sealing member, and the second internal perisporium is inconsistent with the periphery wall of piston, connects through step portion between first internal perisporium and the second internal perisporium, and the cylinder is provided with the oil inlet, and the oil inlet corresponds partial second internal perisporium at least. The hydraulic pressure is dispersed to the cylinder barrel through the step part, so that a sealing element on the end cover can be protected from impact damage, the sealing performance of the hydraulic oil cylinder is improved, and the service life of the hydraulic oil cylinder is prolonged.

Description

Hydraulic oil cylinder

Technical Field

The utility model relates to a hydraulic cylinder.

Background

Oil leakage is to be prevented in hydraulic rams, and therefore sealing of the hydraulic rams is very important. In a prior art, as shown in fig. 1, a hydraulic cylinder includes a cylinder barrel with a hollow interior forming a receiving chamber, one end of the cylinder barrel is closed, and the other end of the cylinder barrel is provided with an opening; the piston rod extends into the accommodating cavity from one end, and the other end of the piston rod extends out of the opening of the cylinder barrel; the piston is sleeved at one end of the piston rod; the piston reciprocates in the axial direction in the accommodating chamber together with the piston rod by oil pressure. An end cover is further sleeved on the piston rod and fixed at the opening of the cylinder barrel, and the opening of the cylinder barrel is sealed. The outer peripheral wall of the end cover abuts against the inner peripheral wall of the cylinder tube and is sealed by a seal member. Still be provided with the oil inlet on the cylinder, hydraulic pressure has in the holding intracavity of cylinder, and hydraulic pressure can direct action on the sealing member of end cover, consequently great to the impact of sealing member for hydraulic cylinder's leakproofness is not good, leaks outside easily, and life reduces greatly.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defect among the prior art, the embodiment of the utility model provides a hydraulic cylinder is provided, include:

the cylinder barrel is closed at one end, an opening is formed in the other end of the cylinder barrel, and an accommodating cavity is formed in the cylinder barrel in a hollow mode;

a piston rod having a main body portion and a connecting portion, the piston rod extending from the connecting portion into the accommodating chamber,

the piston is sleeved on the connecting part and at least part of the main body part, and the other end of the piston is closed;

the end cover is sleeved on the main body part and is fixedly arranged at the opening of the cylinder barrel;

the internal perisporium of cylinder has the first internal perisporium and the second internal perisporium of internal diameter inequality, first internal perisporium with the periphery wall of end cover is inconsistent to it is sealed through the sealing member, the second internal perisporium with the periphery wall of piston is inconsistent, first internal perisporium with connect through step portion between the second internal perisporium, the cylinder is provided with the oil inlet, the oil inlet corresponds partial at least the second internal perisporium.

Further, the inner diameter of the opening of the cylinder barrel is a first inner diameter, the inner peripheral wall of the first inner peripheral wall is a second inner diameter, the inner peripheral wall of the second inner peripheral wall is a third inner diameter, and the second inner diameter is larger than the third inner diameter.

Further, the first inner diameter is larger than the second inner diameter, the end cover is provided with a first portion and a second portion, the outer diameter of the first portion is equal to the first inner diameter, the outer diameter of the second portion is equal to the second inner diameter, seal grooves are respectively arranged on the end face of the first portion and the side wall of the second portion, and the seal elements are respectively arranged in the seal grooves.

Further, the sealing element arranged on the first part is an O-shaped ring, and the sealing element arranged on the second part is a Gray ring.

Further, the periphery of piston is provided with sealed slot, be provided with the sealing member in the sealed slot, the sealing member with the second internal perisporium is inconsistent.

Further, the periphery of the piston is provided with at least one annular groove, a wear-resisting ring is arranged in the annular groove, and the wear-resisting ring is abutted to the second inner peripheral wall.

Further, the main body portion is provided with a first end and a second end which are opposite to each other, the second end is connected with the connecting portion, an installation groove is formed in the periphery of the second end of the piston rod, and an elastic piece is arranged in the installation groove.

Furthermore, the second end is connected with the connecting part through an inclined plane, and the piston is screwed with the piston rod through threads.

Furthermore, an annular sealing groove is formed in the inner peripheral wall of the end cover, a sealing element is arranged in the sealing groove, and the sealing element is sleeved on the periphery of the main body portion of the piston rod.

Further, be provided with threely on the internal perisporium of end cover sealed slot follows first end extremely the direction of second end, the periphery of piston rod overlaps in proper order and is equipped with dust seal, oil seal for the shaft and ste and seals, and holds respectively threely in the sealed slot.

The utility model has the advantages as follows:

the inner diameters of the first inner peripheral wall and the second inner peripheral wall in the hydraulic oil cylinder are not equal, so that the first inner peripheral wall and the second outer peripheral wall are connected through a step part. Most of the hydraulic pressure in the accommodating cavity acts on the step surface, so that the acting force of the hydraulic pressure on the sealing element on the end cover is greatly dispersed, the sealing element on the end cover can be protected from impact damage, the sealing performance of the hydraulic oil cylinder is improved, and the service life of the hydraulic oil cylinder is prolonged.

The end cover is provided with a double sealing structure, so that the pressure resistance of the hydraulic oil cylinder can be improved, the pressure value of the service pressure of the hydraulic oil cylinder is improved, and the service life of the hydraulic oil cylinder is prolonged.

In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic view of a hydraulic cylinder of the prior art of the present invention;

FIG. 2 is a schematic view of a hydraulic cylinder in an embodiment of the present invention;

FIG. 3 is an enlarged view of a portion of FIG. 2;

FIG. 4 is a schematic view of a cylinder barrel in a hydraulic ram;

FIG. 5 is a schematic view of an end cap in a hydraulic ram;

FIG. 6 is a schematic view of a piston in a hydraulic ram.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature.

In order to achieve the above object, the present invention provides a hydraulic cylinder 100, as shown in fig. 2-6, including:

the cylinder barrel 1 is closed at one end, an opening 11 is formed in the other end of the cylinder barrel 1, and an accommodating cavity 12 is formed in the cylinder barrel 1 in a hollow mode;

a piston rod 2, the piston rod 2 having a main body portion 2 and a connecting portion 22, the piston rod 2 extending from the connecting portion 22 into the accommodating chamber 12,

the piston 3 is sleeved on the connecting part 22 and at least part of the main body part 2, and the other end of the piston 3 is closed;

the end cover 4 is sleeved on the main body part 2 and is fixedly arranged at the opening 11 of the cylinder barrel 1;

the inner peripheral wall of the cylinder barrel 1 is provided with a first inner peripheral wall 121 and a second inner peripheral wall 122 which are unequal in inner diameter, the first inner peripheral wall 121 is abutted to the outer peripheral wall of the end cover 4 and sealed through a sealing element, the second inner peripheral wall 122 is abutted to the outer peripheral wall of the piston 3, the first inner peripheral wall 121 and the second inner peripheral wall 122 are connected through a step part 123, the cylinder barrel 1 is provided with an oil inlet 13, and the oil inlet 13 at least corresponds to part of the second inner peripheral wall 122.

In the hydraulic cylinder 100 of the present application, the first inner circumferential wall 121 of the cylinder 1 abuts against the outer circumferential wall of the end cap 4, the second inner circumferential wall 122 of the cylinder 1 abuts against the outer circumferential wall of the piston 3, and the inner diameters of the first inner circumferential wall 121 and the second inner circumferential wall 122 are not equal to each other, so that the first inner circumferential wall 121 and the second outer circumferential wall are connected by the step portion 123. Therefore, most of the hydraulic pressure in the accommodating cavity 12 acts on the step part 123, which greatly disperses the acting force of the hydraulic pressure on the sealing element on the end cover 4, so that the sealing element on the end cover 4 can be protected from impact damage, the sealing performance of the hydraulic oil cylinder 100 is improved, and the service life is prolonged.

In addition, the piston 3 is a blind hole, so that a sealing element between the piston 3 and the piston rod 2 can be omitted, and internal leakage of the hydraulic oil cylinder 100 can be completely avoided.

In the present embodiment, as shown in fig. 2 to 4, the inner diameter of the opening 11 of the cylinder tube 1 is a first inner diameter, the inner peripheral wall 121 is a second inner diameter, and the inner peripheral wall 122 is a third inner diameter, and the second inner diameter is larger than the third inner diameter. The inner diameter of the step portion 123 is gradually reduced in a direction from the main body portion 2 to the connecting portion 22.

As shown in fig. 2 and 5, the first inner diameter is larger than the second inner diameter, the end cap 4 has a first portion 41 and a second portion 42, the first portion 41 has an outer diameter equal to the first inner diameter, the outer circumferential wall of the first portion 41 abuts against the inner wall 120 of the opening 11, the outer diameter of the second portion 42 is equal to the second inner diameter, and the outer circumferential wall of the second portion 42 abuts against the first inner circumferential wall 121. The end cover 4 forms a convex shape to better seal the opening 11 of the cylinder barrel 1. In order to prevent the hydraulic oil cylinder 100 from leaking, the end cap 4 is provided with a double sealing structure, specifically, the end face of the first part 41 and the side wall of the second part 42 are respectively provided with a sealing groove 43, and the sealing elements are respectively arranged in the sealing grooves 43.

Specifically, the sealing member provided on the first part 41 is an O-ring 44, and the sealing member provided on the second part 42 is a gray ring 45.

Through in this hydraulic cylinder 100 step portion 123 disperses hydraulic pressure to cylinder 1 on, has dual seal structure again on the end cover 4, can improve this hydraulic cylinder 100's compressive capacity, has promoted hydraulic cylinder 100's service pressure's pressure value, has also prolonged hydraulic cylinder 100's life simultaneously.

Further, in order to prevent leakage between the piston rod 2 and the end cap 4, as shown in fig. 2 and 5, an annular sealing groove 46 is provided on an inner peripheral wall of the end cap 4, and a sealing member is provided in the sealing groove 46, and the sealing member is fitted around an outer periphery of the main body portion 2 of the piston rod 2.

Specifically, in this embodiment, three sealing grooves 46 are provided on the inner peripheral wall of the end cover 4, and along the direction from the first end 211 to the second end 212, the outer periphery of the piston rod 2 is sequentially sleeved with a dust seal 47, a shaft oil seal 48 and a steckel seal 49, and the dust seal 47, the shaft oil seal 48 and the steckel seal 49 are respectively accommodated in the three sealing grooves 46.

In order to prevent the hydraulic oil cylinder 100 from leaking inwards, as shown in fig. 2 and 6, a sealing groove 31 is formed on the outer periphery of the piston 3, a sealing member 33 is arranged in the sealing groove 31, and the sealing member 33 abuts against the second inner peripheral wall 122.

The outer periphery of the piston 3 is provided with at least one annular groove 32, a wear-resistant ring 34 is arranged in the annular groove 32, and the wear-resistant ring 34 is abutted against the second inner peripheral wall 122. In the present embodiment, there are two annular grooves 32, and the seal groove 31 is located between the two annular grooves 32.

The main body 2 has a first end 211 and a second end 212 opposite to each other along an axial direction thereof, the second end 212 is connected to the connecting portion 22, an installation groove 2121 is formed in an outer circumference of the second end 212 of the piston rod 2, and an elastic member 2122 is arranged in the installation groove 2121.

The second end 212 is connected with the connecting portion 22 through an inclined surface 23, and the piston 3 is screwed with the piston rod 2 through a thread.

The present invention has been explained by using specific embodiments, and the explanation of the above embodiments is only used to help understand the method and the core idea of the present invention; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the specific implementation and application scope, to sum up, the content of the present specification should not be understood as the limitation of the present invention.

Claims

1. A hydraulic cylinder, comprising:

2. The hydraulic ram of claim 1, wherein the inner diameter at the opening of the cylinder is a first inner diameter, the first inner peripheral wall is a second inner diameter, the second inner peripheral wall is a third inner diameter, and the second inner diameter is greater than the third inner diameter.

3. The hydraulic ram of claim 2, wherein the first inner diameter is larger than the second inner diameter, the end cap has a first portion and a second portion, the first portion has an outer diameter equal to the first inner diameter, the second portion has an outer diameter equal to the second inner diameter, and seal grooves are respectively disposed on an end surface of the first portion and a side wall of the second portion, and the seal grooves are respectively disposed therein.

4. A hydraulic ram according to claim 3, wherein the seal provided on the first part is an O-ring and the seal provided on the second part is a gray ring.

5. The hydraulic cylinder according to claim 1, characterized in that the outer periphery of said piston is provided with a sealing groove, a sealing element is arranged in said sealing groove, and said sealing element is abutted against said second inner peripheral wall.

6. The hydraulic ram according to claim 5, wherein said piston is provided with at least one annular groove on its periphery, said annular groove being provided with a wear ring, said wear ring abutting said second inner peripheral wall.

7. The hydraulic cylinder according to claim 1, characterized in that said main body portion has a first end and a second end opposite to each other, said second end is connected to said connecting portion, an installation groove is provided on the outer circumference of said second end of said piston rod, and an elastic member is provided in said installation groove.

8. The hydraulic cylinder according to claim 7, characterized in that the second end is connected with the connecting part through an inclined surface, and the piston is screwed with the piston rod through a thread.

9. The hydraulic oil cylinder as claimed in claim 8, wherein an annular sealing groove is formed in the inner peripheral wall of the end cover, a sealing element is arranged in the sealing groove, and the sealing element is sleeved on the outer periphery of the main body part of the piston rod.

10. The hydraulic oil cylinder as claimed in claim 9, wherein three sealing grooves are formed in the inner peripheral wall of the end cover, and a dust seal, a shaft oil seal and a stet seal are sequentially sleeved on the outer periphery of the piston rod in the direction from the first end to the second end and are respectively accommodated in the three sealing grooves.