CN215486941U - Oil cylinder and arm support - Google Patents
Oil cylinder and arm support Download PDFInfo
- Publication number
- CN215486941U CN215486941U CN202121002042.0U CN202121002042U CN215486941U CN 215486941 U CN215486941 U CN 215486941U CN 202121002042 U CN202121002042 U CN 202121002042U CN 215486941 U CN215486941 U CN 215486941U
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- Prior art keywords
- piston rod
- guide sleeve
- cylinder
- body part
- unbalance
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- 238000007789 sealing Methods 0.000 claims abstract description 38
- 230000000149 penetrating effect Effects 0.000 claims abstract description 4
- 239000002131 composite material Substances 0.000 claims description 50
- 239000000428 dust Substances 0.000 claims description 10
- 238000005461 lubrication Methods 0.000 claims description 10
- 230000002093 peripheral effect Effects 0.000 claims 1
- 230000001050 lubricating effect Effects 0.000 abstract description 6
- 238000005299 abrasion Methods 0.000 abstract description 4
- 239000003921 oil Substances 0.000 description 25
- 239000010687 lubricating oil Substances 0.000 description 14
- 230000004323 axial length Effects 0.000 description 7
- 230000002159 abnormal effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000010720 hydraulic oil Substances 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
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- Fluid-Damping Devices (AREA)
Abstract
The utility model relates to the field of hydraulic parts, and discloses an oil cylinder and an arm support, wherein the oil cylinder comprises a cylinder body (1), a guide sleeve assembly arranged at a port of the cylinder body (1) and a piston rod (3) penetrating through the guide sleeve assembly, the guide sleeve assembly comprises a body part (2) and a sealing component arranged on the inner periphery of the body part (2), and an anti-unbalance-loading protection structure positioned on at least one of two axial sides of the sealing component is arranged on the inner periphery of the body part (2). Through the technical scheme, the anti-unbalance-loading protection structure can improve the anti-unbalance-loading protection when the piston rod is under the eccentric load, can relieve the eccentricity of the piston rod, or can strengthen the lubricating effect, avoid dry friction between the piston rod and the guide sleeve, buffer the abrasion of the guide sleeve assembly and the piston rod, and prolong the service life of the oil cylinder.
Description
Technical Field
The utility model relates to a hydraulic component, in particular to an oil cylinder and an arm support.
Background
The hydraulic oil cylinder is used as a hydraulic power mechanism of engineering machinery, and the aim of structural design is as follows: the hinge mechanism has larger load bearing capacity and can drive the hinge mechanism to stably act; meanwhile, the anti-unbalance loading capacity is good, and the effective combination of the anti-load and unbalance loading of the structure is realized. Hydraulic cylinders are often used in lifting products such as concrete pump trucks, automobile cranes, boom-type aerial platform operation vehicles, and the like.
The common oil cylinder structure at present mainly comprises a cylinder body, a piston rod, a guide sleeve assembly, a sealing ring set and the like. The anti-unbalance loading capability of the structure is provided by the guide ring at the sealing support position of the guide sleeve, but when the unbalance loading of an external structural component is serious, an oil film on the surface of the piston rod of the oil cylinder is extremely easy to damage, and then the oil film is converted into dry friction between the sealing element and the piston rod, so that abnormal abrasion faults are generated.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide an oil cylinder to solve the problem of abnormal abrasion between a piston rod and a guide sleeve in a word during unbalance loading.
In order to achieve the above object, an aspect of the present invention provides a cylinder, where the cylinder includes a cylinder body, a guide sleeve assembly disposed at a port of the cylinder body, and a piston rod penetrating through the guide sleeve assembly, the guide sleeve assembly includes a body portion and a sealing component disposed on an inner periphery of the body portion, and an anti-unbalance-loading protection structure disposed on at least one of two axial sides of the sealing component is disposed on the inner periphery of the body portion.
Optionally, the anti-unbalance loading protection structure comprises a first composite bushing disposed on an inner periphery of the body portion and located on one axial side of the seal assembly.
Optionally, the anti-unbalance protection structure includes an oil passage disposed in the body portion, a first end of the oil passage extends to an inner end face of the body portion, and a second end of the oil passage extends to an inner circumferential surface of the body portion and is located on one axial side of the seal assembly.
Optionally, the first composite bushing and the lubrication oil gallery are located axially inward of the seal assembly, and the second end of the lubrication oil gallery is located between the first composite bushing and the seal assembly.
Optionally, the anti-unbalance loading protection structure comprises a second composite bushing disposed on an inner periphery of the body portion and axially outward of the seal assembly.
Optionally, the first composite bushing is located axially inward of the seal assembly, and the anti-unbalance protection structure includes a second composite bushing disposed on an inner periphery of the body portion and axially outward of the seal assembly.
Optionally, the inner periphery of the body portion is provided with a retaining ring axially inwardly of the first composite bushing.
Optionally, the seal assembly comprises a cushion ring and a piston rod seal ring.
Optionally, the inner circumference of the axial outer end of the body portion is provided with a dust ring, and/or the oil cylinder comprises an end cover located at the axial outer side of the guide sleeve assembly, and the inner circumference of the end cover is provided with the dust ring.
In addition, the utility model also provides an arm support, wherein the arm support is provided with the oil cylinder in the scheme.
Through the technical scheme, the anti-unbalance-loading protection structure can improve the anti-unbalance-loading protection when the piston rod is under the eccentric load, can relieve the eccentricity of the piston rod, or can strengthen the lubricating effect, avoid dry friction between the piston rod and the guide sleeve, buffer the abrasion of the guide sleeve assembly and the piston rod, and prolong the service life of the oil cylinder.
Drawings
Fig. 1 is a partial sectional view of a cylinder according to a first embodiment of the present invention;
fig. 2 is a partial sectional view of a cylinder according to a second embodiment of the present invention;
fig. 3 is a partial sectional view of a cylinder according to a third embodiment of the present invention;
fig. 4 is a partial sectional view of a cylinder according to a fourth embodiment of the present invention;
fig. 5 is a partial sectional view of a cylinder according to a fifth embodiment of the present invention.
Description of the reference numerals
1 cylinder body 2 body part
3 piston rod 4 buffer ring
5 piston rod seal 6 lubricating oil channel
7 first composite liner 8 second composite liner
9 retainer ring and 10 dustproof ring
11 end cap
Detailed Description
The following detailed description of embodiments of the utility model refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
In the present invention, the use of the directional terms such as "inside and outside" means the relative positions of the inside and outside of the cylinder body near the cylinder, unless otherwise specified.
The utility model provides an oil cylinder which comprises a cylinder body 1, a guide sleeve assembly arranged at a port of the cylinder body 1 and a piston rod 3 penetrating through the guide sleeve assembly, wherein the guide sleeve assembly comprises a body part 2 and a sealing component arranged on the inner periphery of the body part 2, and an anti-unbalance-loading protection structure positioned on at least one of two axial sides of the sealing component is arranged on the inner periphery of the body part 2.
Referring to fig. 1 to 5, a guide sleeve assembly is arranged in a port of a cylinder body 1, the guide sleeve assembly is formed with a through hole to accommodate a piston rod 3 to pass through, and a seal is formed between the guide sleeve assembly and the cylinder body 1 and between the guide sleeve assembly and the piston rod 3; the guide sleeve assembly comprises a body part 2, a through hole is formed in the body part 2, and a sealing component is arranged on the inner periphery of the body part 2 to realize sealing between the piston rod 3 and the guide sleeve assembly.
Under normal conditions, the piston rod 3 is coaxial with the cylinder body 1 and the guide sleeve assembly, and when the piston rod 3 bears external load and is not coaxial with the axial center of the piston rod, the piston rod 3 tends to be eccentric, so that the piston rod 3 radially extrudes one part of the sealing component along the circumferential direction, and the sealing effect is reduced.
In order to avoid the sealing failure of the sealing assembly during unbalance loading, an unbalance loading resisting protection structure, such as a composite bushing or a lubricating oil channel, is arranged on two axial sides of the sealing assembly, the composite bushing (such as a DU self-lubricating bearing) can provide radial supporting force for the piston rod 3 in the guide sleeve assembly, unbalance loading is reduced or avoided, lubrication can be provided through the structure of the composite bushing, the lubricating oil channel can pressurize and inject lubricating oil between the piston rod 3 and the body part 2, even when the piston rod 3 is extruded towards one side, a certain amount of lubricating oil can be ensured between the piston rod 3 and the body part 2, and dry friction is avoided.
In this scheme, anti unbalance loading protection architecture can improve anti unbalance loading protection when the piston rod receives eccentric load, can alleviate piston rod off-centre, perhaps can strengthen lubricated effect, avoids appearing dry friction between piston rod and the uide bushing, has cushioned the wearing and tearing of uide bushing assembly and piston rod, has prolonged the life of hydro-cylinder.
Wherein the anti-unbalance loading protection structure comprises a first composite bushing 7 arranged on the inner periphery of the body part 2 and positioned at one axial side of the sealing assembly. The composite bushing can comprise an inner layer bushing and an outer layer bushing, a lubricating medium is arranged between the inner layer bushing and the outer layer bushing, the first composite bushing 7 can stably support the piston rod 3 and relieve eccentric movement of the piston rod, and on the other hand, the first composite bushing 7 can lubricate between the guide sleeve assembly and the piston rod 3 through lubrication inside the first composite bushing 7, and can also play a role in unbalance loading protection caused by the piston rod 3.
In addition, the anti-unbalance loading protection structure comprises an oil lubricating channel 6 arranged in the body part 2, wherein a first end of the oil lubricating channel 6 extends to the inner side end surface of the body part 2, and a second end of the oil lubricating channel 6 extends to the inner circumferential surface of the body part 2 and is positioned on one axial side of the sealing assembly. The lubricating oil passage 6 communicates with a rod chamber in the cylinder block 1, and hydraulic oil can be applied between the body portion 2 of the piston rod 3 through the lubricating oil passage 6 under hydraulic pressure therein, so that an oil film medium can be formed between the piston rod 3 and the body portion 2 when the piston rod 3 eccentrically presses the body portion 2 even if the piston rod 3 is subjected to an offset load, providing lubrication protection.
Further, the first composite bushing 7 and the lubrication oil passage 6 are located axially inward of the seal assembly, and a second end of the lubrication oil passage 6 is located between the first composite bushing 7 and the seal assembly. Referring to fig. 1, a first composite bush 7 is disposed on an axially inner side of a seal assembly (including a cushion ring 4 and a piston rod seal ring 5 described below), and a lubricating oil passage 6 extends from an end surface of the body portion 2 facing the inside of the cylinder body to an inner periphery between the first composite bush 7 and the seal assembly, the first composite bush 7 can provide radial support to the piston rod 3 and provide lubrication, and the lubricating oil passage 6 can introduce lubricating oil, particularly lubricating oil having a certain pressure, from the cylinder body 1 to lubricate between the piston rod 3 and the guide bush assembly. Of course, in other embodiments, the oil gallery 6 may also extend to the inner periphery of the axially outer side of the seal assembly.
Furthermore, the anti-unbalance protection arrangement comprises a second composite bushing 8 arranged on the inner circumference of the body portion 2 and axially outside the sealing assembly. As shown in fig. 2, the composite bushings are arranged on both axial sides of the sealing assembly, so that the sealing assembly can be better protected by the two composite bushings, and the sealing assembly is prevented from being extruded and worn when the piston rod 3 is in unbalance loading; also, in the embodiment shown in fig. 2, a lubricating oil passage 6 is further provided to supply lubricating oil between the piston rod 3 and the guide bush assembly.
As shown in fig. 3-5, the first composite bushing 7 is located axially inward of the seal assembly, and the anti-unbalance protection structure includes a second composite bushing 8 disposed on the inner periphery of the body portion 2 and axially outward of the seal assembly. In the three different embodiments, the composite bushings are arranged on the two axial sides of the sealing assembly, but no lubricating oil channel is arranged, the sealing assembly is protected only by the two composite bushings, and the sealing assembly is prevented from being extruded and abraded when the piston rod 3 is in unbalanced load. In fig. 3, the axial length of the first composite bushing 7 is substantially the same as the axial length of the second composite bushing 8, in fig. 4, the axial length of the first composite bushing 7 is smaller than the axial length of the second composite bushing 8, in fig. 5, the axial length of the first composite bushing 7 is larger than the axial length of the second composite bushing 8, the radial support acting force of the composite bushings with different axial lengths on the piston rod 3 is different, and the composite bushing with a more appropriate size can be selected according to the length of the piston rod 3 and the length of the guide bush assembly.
Further, a retainer ring 9 is provided on the inner periphery of the body 2 so as to be positioned axially inward of the first composite liner 7. As shown in fig. 1-5, the retainer ring 9 is located axially inward of the first composite bushing 7 and stops against the first composite bushing 7 to prevent the first composite bushing 7 from disengaging from the guide sleeve assembly. When installed, the first composite bushing 7 may be inserted in an axially outward direction from an axially inner end of the guide sleeve assembly.
Wherein, the seal assembly comprises a buffer ring 4 and a piston rod seal ring 5. Both the cushion ring 4 and the piston rod sealing ring 5 may provide a sealing action between the piston rod 3 and the body portion 2.
In addition, the inner periphery of the axial outer end of the body part 2 is provided with a dust ring 10, and/or the oil cylinder comprises an end cover 11 positioned on the axial outer side of the guide sleeve assembly, and the inner periphery of the end cover 11 is provided with the dust ring 10. In one embodiment, as shown in fig. 1, a dust ring 10 is provided on the inner periphery of the body 2 to prevent external dust and impurities from entering between the body 2 and the piston rod 3; in another embodiment, an end cover 11 is further provided on the axially outer side of the body portion 2, the end cover 11 is connected to the body portion 2 through a bolt, and a dust ring 10 is provided on the inner periphery of the end cover 11, which can better prevent external dust and impurities from entering between the piston rod 3 and the body portion 2, and can also serve as a retaining ring to play a role of limiting and supporting the second composite bushing 8.
In addition, the utility model also provides an arm support, wherein the arm support is provided with the oil cylinder in the scheme. The cylinder may be used to drive the movement of the respective arm sections, which inevitably receives a load in a direction perpendicular to the central axis, i.e. an offset load, and therefore the guide bush assembly and the piston rod may be retained by the above-described anti-offset load protection structure.
The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited thereto. Within the scope of the technical idea of the utility model, numerous simple modifications can be made to the technical solution of the utility model, including combinations of the specific features in any suitable way, and the utility model will not be further described in relation to the various possible combinations in order to avoid unnecessary repetition. Such simple modifications and combinations should be considered within the scope of the present disclosure as well.
Claims (10)
1. The oil cylinder is characterized by comprising a cylinder body (1), a guide sleeve assembly arranged at a port of the cylinder body (1) and a piston rod (3) penetrating through the guide sleeve assembly, wherein the guide sleeve assembly comprises a body part (2) and a sealing component arranged on the inner periphery of the body part (2), and an anti-unbalance-loading protection structure positioned on at least one of two axial sides of the sealing component is arranged on the inner periphery of the body part (2).
2. The cylinder according to claim 1, characterized in that the anti-unbalance protection comprises a first composite bushing (7) arranged on the inner circumference of the body portion (2) on one axial side of the sealing assembly.
3. The cylinder according to claim 2, characterized in that the anti-unbalance loading protection structure comprises an oil passage (6) arranged in the body part (2), wherein a first end of the oil passage (6) extends to an inner side end surface of the body part (2), and a second end extends to an inner peripheral surface of the body part (2) and is positioned at one axial side of the sealing assembly.
4. The cylinder according to claim 3, characterized in that the first composite bushing (7) and the lubrication duct (6) are located axially inside the sealing assembly, and the second end of the lubrication duct (6) is located between the first composite bushing (7) and the sealing assembly.
5. The cylinder according to claim 4, characterized in that the anti-unbalance protection comprises a second composite bushing (8) arranged on the inner circumference of the body portion (2) axially outside the sealing assembly.
6. The cylinder according to claim 2, characterized in that the first composite bushing (7) is located axially inside the sealing assembly, and the anti-unbalance protection comprises a second composite bushing (8) arranged on the inner circumference of the body portion (2) and axially outside the sealing assembly.
7. A cylinder according to claim 2, characterized in that the inner periphery of the body part (2) is provided with a collar (9) axially inside the first composite bushing (7).
8. The cylinder according to claim 1, characterized in that the sealing assembly comprises a cushion ring (4) and a piston rod sealing ring (5).
9. The cylinder according to claim 1, characterized in that the inner circumference of the axially outer end of the body portion (2) is provided with a dust ring (10) and/or that the cylinder comprises an end cover (11) located axially outside the guide sleeve assembly, the inner circumference of the end cover (11) being provided with a dust ring (10).
10. An arm support, characterized in that the arm support is provided with a cylinder according to any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121002042.0U CN215486941U (en) | 2021-05-11 | 2021-05-11 | Oil cylinder and arm support |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121002042.0U CN215486941U (en) | 2021-05-11 | 2021-05-11 | Oil cylinder and arm support |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215486941U true CN215486941U (en) | 2022-01-11 |
Family
ID=79777731
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121002042.0U Active CN215486941U (en) | 2021-05-11 | 2021-05-11 | Oil cylinder and arm support |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215486941U (en) |
-
2021
- 2021-05-11 CN CN202121002042.0U patent/CN215486941U/en active Active
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| GR01 | Patent grant | ||
| GR01 | Patent grant |