CN215409531U - Buffer sleeve and oil cylinder - Google Patents

Abstract

The utility model relates to the technical field of oil cylinders, in particular to a buffer sleeve and an oil cylinder. The utility model provides a cushion collar, includes the cushion collar body, and the outer peripheral face of cushion collar body is formed with a plurality of ring channel, and the outer peripheral face of cushion collar body still is formed with a plurality of ribbon-like filament, and a plurality of ribbon-like filament distributes along circumference, the ribbon-like filament is on a parallel with the axis of cushion collar body extends, the ribbon-like filament certainly the axial one end of cushion collar body extends to the other end. A cylinder, comprising: the opening of the cylinder body is provided with an end cover; the piston assembly comprises a piston and a piston rod, the piston slides along the cylinder body, and the piston rod extends out of the cylinder body from an inner hole of the end cover; the buffer sleeve is assembled on the piston rod and can move to the inner hole of the end cover along with the piston rod. The technical problems that the buffering effect of a buffering sleeve in the prior art is not easy to control, and the safety and the service life of an oil cylinder are affected are solved.

Description

Buffer sleeve and oil cylinder

Technical Field

The utility model relates to the technical field of oil cylinders, in particular to a buffer sleeve and an oil cylinder.

Background

The pneumatic cylinder is widely used in engineering machine, the normal use of digging the machine is guaranteed mainly through piston rod reciprocating motion to the pneumatic cylinder on the present machine of digging, and the rate of motion is very fast, for avoiding taking place strong striking and vibration, guarantee the steady operation of system, prevent to damage drive disk assembly, the noise reduction increases operating personnel's the comfort level of controlling, the performance and the life of the use of improvement system and hydro-cylinder must cushion before the piston rod motion is ended soon, make the piston rod can slow end.

Most of oil cylinder buffer structures in the prior art adopt a buffer sleeve structure, a buffer sleeve is assembled on a piston rod, and the buffer is realized by forming a gap between the buffer sleeve and an inner hole of an end cover, so that the oil cylinder decelerates when running to the bottom, but if the gap between the buffer sleeve and the inner hole of the end cover is too small, the pressure relief is too slow, the pressure is too high, the oil cylinder expands and leaks oil, and the service life of the oil cylinder is reduced; if too big clearance between cushion collar and the end cover hole, can lead to the pressure release too fast, lead to the buffering time too short or do not have the buffering, can cause the emergence striking of hydro-cylinder, produce the vibration.

SUMMERY OF THE UTILITY MODEL

The utility model provides a buffer sleeve and an oil cylinder, and aims to solve the technical problems that the buffer action of the buffer sleeve is difficult to control, and the safety and the service life of the oil cylinder are affected in the prior art. The technical scheme of the utility model is as follows:

the utility model provides a cushion collar, includes the cushion collar body, the outer peripheral face of cushion collar body is formed with a plurality of ring channel, the outer peripheral face of cushion collar body still is formed with a plurality of ribbon-like filament, a plurality of the ribbon-like filament distributes along circumference, the ribbon-like filament is on a parallel with the axis of cushion collar body extends, the ribbon-like filament certainly the axial one end of cushion collar body extends to the other end.

According to the buffer sleeve disclosed by the utility model, when the buffer sleeve is used for buffering, the gap between the periphery of the buffer sleeve and the end cover is not too large, so that too fast oil drainage is prevented; the annular groove and the flat wire are arranged on the outer peripheral surface of the buffer sleeve body, oil can be drained through the annular groove and the flat wire on the buffer sleeve, further, the increase of buffer back pressure is prevented, and the situations of cylinder expansion and oil leakage are avoided. In addition, the annular groove can collect impurities and bubbles in the oil, so that the influence of the impurities and the bubbles on the use of the oil cylinder is reduced; the flat wire extends to the other end from the axial one end of cushion collar body, can guarantee the sealed while of buffering, fluid can flow out the hydro-cylinder through the flat wire.

According to one embodiment of the utility model, the number of the annular grooves is at least two, the at least two annular grooves are arranged close to one axial end of the buffer sleeve body, and the annular grooves are distributed at equal intervals.

According to one embodiment of the present invention, the outer surfaces of both axial ends of the cushion sleeve body are formed with chamfers.

According to one embodiment of the utility model, the number of the flat wires is at least two, at least two flat wires are uniformly distributed along the circumferential direction, and the width of the flat wires varies along the axial direction.

According to one embodiment of the utility model, the width of the flat wire changes from large to small along the axial direction, and the annular grooves are distributed at one end of the flat wire with the larger width.

According to one embodiment of the utility model, a slot is further formed at one end of the buffer sleeve body, which is far away from the annular groove, and the slot is arranged corresponding to the flat wire.

According to one embodiment of the present invention, the inner surface of the cushion cover body is formed with an inner stepped surface.

A cylinder, comprising:

the opening of the cylinder body is provided with an end cover;

the piston assembly comprises a piston and a piston rod, the piston slides along the cylinder body, and the piston rod extends out of the cylinder body from an inner hole of the end cover;

the buffer sleeve is assembled on the piston rod and can move to the inner hole of the end cover along with the piston rod.

According to an embodiment of the present invention, the outer surface of the piston rod is formed with an outer stepped surface to be assembled with the damping sleeve.

According to one embodiment of the utility model, the end of the damping sleeve provided with the annular groove is remote from the piston.

Based on the technical scheme, the utility model can realize the following technical effects:

1. according to the buffer sleeve and the oil cylinder, when the buffer sleeve is used for buffering, the gap between the periphery of the buffer sleeve and the end cover is not too large, and oil drainage is prevented from being too fast; the annular groove and the flat wire are arranged on the outer peripheral surface of the buffer sleeve body, oil can be drained through the annular groove and the flat wire on the buffer sleeve, further, the increase of buffer back pressure is prevented, and the situations of cylinder expansion and oil leakage are avoided. In addition, the annular groove can collect impurities and bubbles in the oil, so that the influence of the impurities and the bubbles on the use of the oil cylinder is reduced; the flat wire extends from one axial end of the buffer sleeve body to the other axial end of the buffer sleeve body, so that buffer sealing can be guaranteed, oil can flow out of the oil cylinder through the flat wire, a pressure relief hole does not need to be formed in the end cover, the risk of stress concentration at the pressure relief hole of the end cover is reduced, and failure of the oil cylinder caused by overhigh oil pressure during buffering of the oil cylinder due to few pressure relief holes is avoided;

2. according to the buffer sleeve, the chamfers are formed on the outer surfaces of the two axial ends of the buffer sleeve body, so that the buffer sleeve body can conveniently move to the inner hole of the end cover along with the piston assembly to play a buffer role; the number of the flat wires is at least two, so that the oil can be guaranteed to be decompressed from the flat wires; the width of the flat wire is changed from large to small along the axial direction, so that oil can flow in from one end with smaller width of the flat wire and flow out from one end with larger width of the flat wire, and the pressure relief of the oil is convenient; the buffer sleeve body is provided with a slot corresponding to the flat wire, so that when the buffer sleeve is buffered to the bottom and the piston rod needs to retract, oil can enter between the buffer sleeve and the piston rod from the slot and then enter the rod cavity to act on the piston to push the piston to move, and the retraction of the piston rod is realized;

3. according to the buffer sleeve and the oil cylinder, the inner stepped surface is formed on the inner surface of the buffer sleeve body, the outer stepped surface can be correspondingly formed on the piston rod, the inner stepped surface and the outer stepped surface are assembled in a matched mode, and a buffer ring structure is not required to be arranged. During buffering, because the acting force of the oil in the rod cavity can compress the buffer sleeve on the piston rod, a seal is formed between the piston rod and the buffer sleeve, and the oil can only flow to the inner hole of the end cover through the flat wire on the outer surface of the buffer sleeve to be decompressed, so that the buffering time is prolonged, and the buffering effect is ensured.

Drawings

FIG. 1 is a schematic structural view of a cushion collar of the present invention;

FIG. 2 is a front view of the cushion collar;

FIG. 3 is a right side view of the cushion collar;

FIG. 4 is a left side view of the cushion collar;

FIG. 5 is a cross-sectional view of a cushion collar;

FIG. 6 is a schematic structural diagram of the cylinder of the present embodiment;

FIG. 7 is a cross-sectional view of the cylinder;

FIG. 8 is a partial cross-sectional view of the cylinder port;

FIG. 9 is a partial cross-sectional view at the bottom of the cylinder;

FIG. 10 is a schematic structural view of an end cap;

FIG. 11 is a cross-sectional view of the end cap;

FIG. 12 is a schematic view of the piston rod;

FIGS. 13(A) - (C) are views showing the state that the cylinder is extended to the bottom;

in the figure: 1-a buffer sleeve; 11-a cushion collar body; 12-an annular groove; 13-flat filament; 14-chamfering; 15-slotting; 16-an inner stepped surface; 2-cylinder body; 21-end cap; 211-inner bore; 3-a piston assembly; 31-a piston; 32-a piston rod; 321-outer stepped surface.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the utility model, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and in the case of not making a reverse description, these orientation words do not indicate and imply that the device or element being referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be considered as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of the present invention should not be construed as being limited.

As shown in fig. 1-5, the present embodiment provides a cushion cover 1, the cushion cover 1 can be assembled on the piston rod 32 of the oil cylinder, when the piston rod 32 is extended to the bottom, the cushion cover 1 can be extended into the inner hole 211 of the end cover 21 on the cylinder body 2 of the oil cylinder to form cushion.

The buffer sleeve 1 comprises a buffer sleeve body 11, the buffer sleeve body 11 is a sleeve body with two open ends, an annular groove 12 is formed on the outer peripheral surface of the buffer sleeve body 11, the annular groove 12 is a plurality of, the annular grooves 12 are axially arranged on the outer peripheral surface of the buffer sleeve body 11, preferably, the annular grooves 12 are at least two, and at least two annular grooves 12 are distributed on the buffer sleeve body 11 in parallel and at equal intervals.

As a preferred technical solution of this embodiment, the plurality of annular grooves 12 are disposed near one axial end of the cushion collar body 11, and the annular grooves 12 are not disposed at the other end of the cushion collar body 11, in this embodiment, the number of the annular grooves 12 is 5. Through setting up ring channel 12, can collect impurity and bubble in the fluid of hydro-cylinder, and then reduce the influence of impurity and bubble to the hydro-cylinder.

In order to ensure the pressure relief effect of the oil cylinder, a flat wire 13 is further formed on the outer peripheral surface of the buffer sleeve body 11, the flat wire 13 extends axially, the flat wire 13 extends from one axial end of the buffer sleeve body 11 to the other axial end, and the flat wire axially penetrates through the buffer sleeve body 11. Through setting up flat filament 13, flat filament 13 communicates with each other with annular groove 12, and when the hydro-cylinder decompressed, fluid can circulate to end cover 21 hole through annular groove 12 and flat filament 13, carries out the pressure release through the oil circuit in the end cover 21 again, and then prevents the increase of buffering backpressure, stops to rise the jar and the condition of leaking oil.

As a preferred technical solution of this embodiment, there are a plurality of flat wires 13, preferably at least two flat wires 13, and at least two flat wires 13 are uniformly distributed along the circumferential direction, so as to realize balanced pressure relief. In this embodiment, the number of the flat wires 13 is 4, and the flat wires are uniformly distributed in the circumferential direction.

As the preferred technical scheme of this embodiment, the width of flat filament 13 changes along the axial, and for convenient pressure release, the width of flat filament 13 is changed by big to little along the axial, and the width of the one end of flat filament 13 that is close to ring channel 12 is greater than the width of the other end, and fluid can enter into between cushion collar 1 and the end cover 21 from the less one end of flat filament 13 width, flows out from the great one end of flat filament 13 width again and carries out the pressure release, can prolong buffering time, guarantees the buffering effect.

As a preferred technical solution of this embodiment, a slot 15 is formed at an end portion of the cushion collar body 11 corresponding to the flat wire 13, the slot 15 is disposed corresponding to a smaller end of the flat wire 13, the number of the slots 15 is the same as that of the flat wires 13, and the slots 15 and the flat wires 13 are disposed in one-to-one correspondence.

In order to facilitate the buffer sleeve body 11 to extend into the inner hole 211 of the end cover 21, chamfers 14 are further arranged at two axial ends of the buffer sleeve body 11, and the chamfers 14 are arranged, so that the size of the two axial ends of the buffer sleeve body 11 can be slightly reduced, the buffer sleeve body 11 can move into the inner hole of the end cover 21 along with the piston rod 32 conveniently, and collision cannot occur.

In order to facilitate the assembly of the cushion collar 1, an inner stepped surface 16 is further formed on the inner circumferential surface of the cushion collar body 11, an outer stepped surface 321 is formed on the outer circumferential surface of the piston rod 32 correspondingly, the inner stepped surface 16 of the cushion collar body 11 is matched with the outer stepped surface 321 on the piston rod 32, the end portion of the cushion collar body 11 is limited by the piston 31, and the assembly of the cushion collar body 11 can be realized.

As shown in fig. 6 to 13, this embodiment further provides an oil cylinder, which includes the above-mentioned cushion collar 1, a cylinder body 2 and a piston assembly 3, one end of the cylinder body 2 has an opening, an end cover 21 is disposed at the opening, the end cover 21 has an inner hole 211, the piston assembly 3 includes a piston 31 and a piston rod 32, one end of the piston rod 32 is assembled with the piston 31, the other end of the piston rod 32 extends out from the inner hole 211 of the end cover 21, the piston 31 is in sliding fit with the inner wall of the cylinder body 2, the cushion collar 1 is assembled on the piston rod 32, and when the piston rod 32 extends to the bottom, the cushion collar 1 can extend into the inner hole 211 of the end cover 21 and is in clearance fit with the inner hole 211 of the end cover 21.

The outer peripheral surface of the piston rod 32 is formed with an outer stepped surface 321, the inner stepped surface 16 of the cushion sleeve 1 is engaged with the outer stepped surface 321, and the other axial end of the cushion sleeve 1 is restrained by the piston 31, so that the cushion sleeve 1 can be axially restrained between the outer stepped surface 321 of the piston rod 32 and the piston 31.

A first oil path 212 is formed on the cylinder cover 21 of the cylinder body 2, and the first oil path 212 extends to be communicated with an inner hole 211 of the cylinder cover 21; the cylinder block 2 has a second oil passage 22 formed at the bottom thereof. The piston 31 partitions the inner chamber of the cylinder 2 into a rod chamber a and a rodless chamber B, the first oil passage 212 communicates with the rod chamber a, and the second oil passage 22 communicates with the rodless chamber B.

Based on the above structure, when the oil cylinder of this embodiment is in operation, when the oil pressure of the rodless cavity B is greater than the oil pressure of the rod cavity a, the piston assembly 3 is driven by the oil pressure difference between the two sides to move, and the piston rod 32 extends out of the cylinder body 2. When the buffer sleeve 1 on the piston rod 32 extends into the inner hole 211 of the end cover 21, because the clearance between the inner hole 211 of the end cover 21 and the buffer sleeve 1 is small, the oil passing area is rapidly reduced, the oil pressure in the rod cavity A is increased (greater than the oil pressure in the rodless cavity B), the moving speed of the piston 31 is reduced, under the action of the oil pressure, the inner stepped surface 16 of the buffer sleeve 1 and the outer stepped surface 321 of the piston rod 32 are pressed and sealed, and meanwhile, the oil in the rod cavity A enters the first oil way 212 for oil return through the clearance between the buffer sleeve 1 and the inner hole 211 of the end cover 21, so that the back pressure of the rod cavity A is reduced;

when the piston is started, pressure oil can enter the inner hole 211 of the end cover 21 through the first oil path 212 and then enter the rod cavity A through the gap between the buffer sleeve 1 and the piston rod 32 and the open slot 15, so that the piston 31 is pushed to slide along the cylinder body 2, and the retraction of the piston rod 32 is realized. The slot 15 is arranged to facilitate the starting of the oil cylinder.

The embodiments of the present invention have been described in detail with reference to the drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.

Claims (10)

1. The utility model provides a cushion collar, its characterized in that, includes cushion collar body (11), the outer peripheral face of cushion collar body (11) is formed with a plurality of ring channel (12), the outer peripheral face of cushion collar body (11) still is formed with a plurality of ribbon-like filament (13), a plurality of ribbon-like filament (13) distribute along circumference, ribbon-like filament (13) are on a parallel with the axis of cushion collar body (11) extends, ribbon-like filament (13) certainly the axial one end of cushion collar body (11) extends to the other end.

2. The cushion collar according to claim 1, wherein the number of the annular grooves (12) is at least two, at least two annular grooves (12) are arranged near one axial end of the cushion collar body (11), and the annular grooves (12) are distributed at equal intervals.

3. A cushion collar according to claim 1, wherein the outer surfaces of both axial ends of the cushion collar body (11) are formed with chamfers (14).

4. A cushion collar according to claim 1, wherein the number of the flat wires (13) is at least two, at least two flat wires (13) are evenly distributed along the circumferential direction, and the width of the flat wires (13) varies along the axial direction.

5. A cushion collar according to claim 4, wherein the width of the flat wire (13) varies from large to small in the axial direction, and the annular groove (12) is formed at the end of the flat wire (13) having a larger width.

6. A cushion collar according to claim 5, wherein an end of the cushion collar body (11) remote from the annular groove (12) is further formed with a slot (15), and the slot (15) is disposed corresponding to the flat wire (13).

7. A cushion collar according to any one of claims 1 to 6, wherein the inner surface of the cushion collar body (11) is formed with an inner stepped surface (16).

8. An oil cylinder, characterized by comprising:

the cylinder body (2), the opening of the cylinder body (2) is provided with an end cover (21);

the piston assembly (3) comprises a piston (31) and a piston rod (32), the piston (31) moves along the cylinder body (2) in a sliding mode, and the piston rod (32) extends out of the cylinder body (2) from an inner hole (211) of the end cover (21);

the damping sleeve (1) according to any one of claims 1 to 7, the damping sleeve (1) being fitted on the piston rod (32), the damping sleeve (1) being movable with the piston rod (32) into the inner bore (211) of the end cap (21).

9. An oil cylinder according to claim 8, characterized in that the outer surface of the piston rod (32) is formed with an outer stepped surface (321) to be assembled with the cushion cover (1).

10. A cylinder according to claim 9, characterized in that the end of the cushion sleeve (1) provided with the annular groove (12) is remote from the piston (31).

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