Deceleration hydraulic oil cylinder

Abstract

The utility model provides a speed reduction hydraulic oil cylinder which comprises a cylinder body, a piston is arranged in the cylinder body, a rod body is arranged at one end of the piston, and one end of the rod body extends out of the cylinder body. An oil passing hole is formed in the side wall of the end of the cylinder body, at least one end of the piston is provided with a throttling structure, and when the piston moves till the side face of the end where the throttling structure is located coincides with the oil passing hole in the corresponding end of the cylinder body, the throttling structure is communicated with the oil passing hole. When the piston moves towards the throttling structure, the throttling structure is firstly communicated with the oil passing hole, so that oil enters the oil passing hole through the throttling structure, the flow of the oil is reduced through the throttling effect, the movement speed of the piston is reduced in advance, and the impact force of the piston on a cylinder seat at the end part of the cylinder body is greatly reduced. Furthermore, the throttling structure comprises a buffering groove and a throttling hole, the buffering groove is formed in the end face of the piston, one end of the throttling hole extends to the side wall of the buffering groove, and the other end of the throttling hole extends to the side face of the piston.

Description

TECHNICAL FIELD

[0001] The utility model relates to hydraulic oil cylinder technical field, concretely relates to a deceleration hydraulic oil cylinder. BACKGROUND

[0002] Hydraulic oil cylinder is often used in agricultural machinery such as tractor, such as steering cylinder, dump cylinder, bears larger load. In the telescopic process of oil cylinder, the oil on the side of the movement direction of piston rod needs to flow back to the oil tank. When the piston rod moves downward to the limit position, the speed of piston rod reduces to zero in a very short time, because the load direction and its inertia direction are both downward, so that the piston rod generates a great impact force to the cylinder seat of cylinder body instantaneously, which brings the risk of cylinder explosion, reduces the safety and service life of oil cylinder.

[0003] At present, some models adopt external mechanical limiting structure to limit the piston rod, to avoid the piston rod from telescoping to the limit position. But this structure does not reduce the impact force, but only transfers the impact force to the outside, so it also has great requirements on the strength, fatigue resistance, buffering performance and the like of the mechanical limiting structure, so the cost is high. SUMMARY

[0004] The technical problem to be solved by the utility model is how to reduce the impact force when the piston rod moves downward to the limit position.

[0005] The technical scheme for solving the above technical problem of the utility model is as follows:

[0006] The utility model provides a deceleration hydraulic oil cylinder, including cylinder body, the cylinder body is equipped with the piston, and the one end of piston is equipped with the rod body, and the one end of rod body extends cylinder body, the lateral wall of cylinder body end is equipped with the oil passing hole, and at least one end of piston is equipped with the throttling structure, when the side surface of one end of piston moving to the throttling structure coincides with the oil passing hole of corresponding one end of cylinder body, the throttling structure is communicated with the oil passing hole.

[0007] The utility model has the advantages of:

[0008] When the piston moves to the throttling structure, the throttling structure is communicated with the oil passing hole of corresponding one end of cylinder body first, so that the oil enters the oil passing hole through the throttling structure, the throttling effect reduces the oil flow, the movement speed of piston reduces in advance, the impact force of piston to the cylinder seat of cylinder body end is greatly reduced, the risk of cylinder explosion is avoided, the safety is good, and the service life is long.

[0009] On the basis of the above technical scheme, the utility model can also be improved as follows.

[0010] Further, the throttling structure comprises a buffer groove and a throttling hole, the buffer groove is arranged on the end face of the piston, one end of the throttling hole extends to the side wall of the buffer groove, and the other end extends to the side face of the piston; when the piston moves to the side face of the one end of the throttling structure and the through oil hole of the corresponding one end of the cylinder body coincide, the throttling hole and the through oil hole are communicated.

[0011] When the piston approaches the limit position, the oil enters the through oil hole through the buffer groove and the throttling hole in turn, the flow rate of the throttling hole is positively correlated with the oil pressure, and the oil pressure is positively correlated with the impact force, so that the impact force is facilitated to be smoothly reduced, the piston is relatively uniformly decelerated, and the stability is good; the throttling structure is not easy to be blocked, and the reliability is good.

[0012] Further, the throttling hole is arranged at least two and is distributed along the axial direction of the piston.

[0013] The plurality of throttling holes are communicated with the through oil hole in turn, so that the deceleration movement stroke of the piston is facilitated to be increased, and the impact force is reduced.

[0014] Further, the diameter of the throttling hole is gradually reduced from the end face of the piston to the middle direction of the piston.

[0015] The throttling resistance is facilitated to be gradually increased, the continuous deceleration of the piston is realized, and the impact force is reduced.

[0016] Further, the diameter of the first throttling hole is twice the diameter of the second throttling hole from the end face of the piston to the middle direction of the piston.

[0017] The two-stage deceleration of the piston is realized, the impact force changes of the two-stage deceleration processes are basically the same, the cylinder body is stably stressed, and the service life is long.

[0018] Further, the throttling hole extends along the radial direction of the piston.

[0019] The processing is convenient, and the throttling hole is not easy to be blocked; meanwhile, the length of the throttling hole is easy to control, the flow is facilitated to be calculated in design, and the controllability is good.

[0020] Further, the side face of the piston is further provided with an annular gap groove, and the other end of the throttling hole extends to the bottom of the gap groove.

[0021] When the side face of the piston coincides with the through oil hole, the throttling hole is communicated with the through oil hole through the gap groove, the safety is good, the sudden closure of the through oil hole when the throttling hole and the through oil hole are misaligned is avoided, the communication time of the throttling hole and the through oil hole is increased, the deceleration stroke is long, and the impact force is small.

[0022] Further, in the case that the throttling hole is arranged at least two and is distributed along the axial direction of the piston; the gap groove is arranged at least two, and each throttling hole and a gap groove correspond to each other and are communicated.

[0023] The deceleration stroke of the piston is greatly increased, and the impact force is reduced.

[0024] Further, the gap groove is communicated with the end face of the piston.

[0025] The oil liquid can also enter the oil passing hole through the gap groove to form throttling effect, as the distance between the end face of the piston and the oil passing hole increases, the resistance of the gap groove continuously increases, the oil liquid flow gradually decreases, the continuous deceleration of the piston is facilitated, the force of the piston is stable, the impact force is reduced, meanwhile, the safety is improved.

[0026] Further, the both ends of the piston are provided with throttling structures.

[0027] The extension and retraction strokes of the oil cylinder all have deceleration processes, the impact force is reduced, and the service life of the oil cylinder is prolonged. BRIEF DESCRIPTION OF DRAWINGS

[0028] Fig. 1 It is a structural schematic view of the utility model.

[0029] Fig. 2 It is an enlarged detail view of the cylinder seat part.

[0030] In the drawings, the technical features represented by the reference signs are as follows:

[0031] 1-cylinder body; 2-piston; 3-rod body; 4-oil passing hole; 5-buffer groove; 6-throttling hole; 7-gap groove. DETAILED DESCRIPTION

[0032] The principles and characteristics of the utility model are described below in combination with the drawings, the examples are only used for explaining the utility model, and are not used for limiting the range of the utility model.

[0033] The utility model refers to Figs. 1-2 .

[0034] The utility model provides a kind of deceleration hydraulic oil cylinder, including cylinder body 1, piston 2 is equipped in the cylinder body 1, one end of piston 2 is equipped with rod body 3, one end of rod body 3 extends out of cylinder body 1;The side wall of the end of cylinder body 1 is equipped with oil passing hole 4, at least one end of piston 2 is equipped with throttling structure, when piston 2 moves to the side surface of one end of throttling structure and the oil passing hole 4 of corresponding one end of cylinder body 1 coincides, throttling structure is communicated with oil passing hole 4.

[0035] Principle:

[0036] Generally, the hydraulic cylinder has the oil passing hole 4 structure at both ends, when the oil passing hole 4 at one end is filled with oil, the oil passing hole 4 at the other end is filled with oil, the piston 2 drives the rod body 3 to extend, in the contrary, the piston 2 drives the rod body 3 to retract. The piston 2 can be provided with the throttling structure at only one end, if necessary, the throttling structure can be provided at both ends. When the piston 2 is provided with the throttling structure at only one end, the one end provided with the throttling structure can be installed in the direction of the larger impact (generally, the one end is installed downward).

[0037] When the piston 2 moves to the throttling structure direction and approaches the limit position, the side surface of the piston 2 is first coincided with the oil passing hole 4 at one end of the cylinder body 1, at this time, the oil liquid filled in the oil passing hole 4 at the side needs to pass through the throttling structure and enter the oil passing hole 4, the throttling effect increases the oil liquid resistance and reduces the flow, the movement speed of the piston 2 is reduced, thereby avoiding the piston 2 from reducing from the higher speed to zero in a very short time.

[0038] When the piston 2 moves to the throttling structure direction, the throttling structure is first communicated with the oil passing hole 4 at one end of the cylinder body 1, the oil liquid passes through the throttling structure and enters the oil passing hole 4, the throttling effect reduces the oil liquid flow, the movement speed of the piston 2 is reduced in advance, the impact force of the piston 2 to the cylinder seat at the end of the cylinder body 1 is greatly reduced, the risk of cylinder explosion is avoided, the safety is good, and the service life is long.

[0039] Further, the throttling structure includes the buffer groove 5 and the throttling hole 6, the buffer groove 5 is arranged on the end surface of the piston 2, one end of the throttling hole 6 extends to the side wall of the buffer groove 5, and the other end extends to the side surface of the piston 2; when the piston 2 moves to the side surface of the one end provided with the throttling structure and is coincided with the oil passing hole 4 at one end of the cylinder body 1, the throttling hole 6 is communicated with the oil passing hole 4.

[0040] When the piston 2 approaches the limit position, the oil liquid sequentially passes through the buffer groove 5 and the throttling hole 6 and enters the oil passing hole 4, the flow rate of the throttling hole 6 is positively related to the oil pressure, the oil pressure is positively related to the impact force, the impact force is facilitated to be stably reduced, the piston 2 is relatively uniformly decelerated, and the stability is good; the throttling hole 6 is not easy to be blocked, and the reliability is good.

[0041] Further, the throttling hole 6 is arranged at least two and is distributed in the axial direction of the piston 2.

[0042] The plurality of throttling holes 6 are sequentially communicated with the oil passing hole 4, thereby facilitating to increase the deceleration movement stroke of the piston 2 and reduce the impact force.

[0043] Further, from the end surface of the piston 2 to the middle direction of the piston 2, the diameter of the throttling hole 6 is sequentially reduced.

[0044] The throttling resistance is facilitated to be gradually increased, the piston 2 is continuously decelerated, and the impact force is reduced.

[0045] Further, the diameter of the first throttle hole 6 is twice the diameter of the second throttle hole 6 from the end surface of the piston 2 to the middle of the piston 2.

[0046] Preferably, the diameter of the first throttle hole 6 is 4mm-8mm and the diameter of the second throttle hole 6 is 2mm-4mm from the end surface of the piston 2 to the middle of the piston 2. For example, the diameter of the first throttle hole 6 is 4mm and the diameter of the second throttle hole 6 is 2mm; or the diameter of the first throttle hole 6 is 8mm and the diameter of the second throttle hole 6 is 4mm.

[0047] The two-stage deceleration of the piston 2 is achieved, and the impact force changes of the two-stage deceleration processes are basically the same, so that the cylinder 1 is stable in force and has a long service life.

[0048] Further, the throttle hole 6 extends along the radial direction of the piston 2.

[0049] The machining is convenient and the throttle hole 6 is not easy to be blocked; meanwhile, the length of the throttle hole 6 is easy to control, the flow is easy to calculate in design, and the controllability is good.

[0050] Further, the side surface of the piston 2 is further provided with an annular gap groove 7, and the other end of the throttle hole 6 extends to the bottom of the gap groove 7.

[0051] When the side surface of the piston 2 coincides with the oil passage hole 4, the throttle hole 6 is connected to the oil passage hole 4 through the gap groove 7, which avoids the sudden closure of the oil passage hole 4 when the throttle hole 6 is misaligned with the oil passage hole 4, thereby avoiding the sharp increase of the impact force and improving the safety; meanwhile, the communication time of the throttle hole 6 and the oil passage hole 4 is increased, the deceleration stroke is long, and the impact force is small.

[0052] Further, in the case that the throttle hole 6 is provided with at least two and is distributed along the axial direction of the piston 2; the gap groove 7 is provided with at least two, and each throttle hole 6 corresponds to and communicates with a gap groove 7.

[0053] The deceleration stroke of the piston 2 is greatly increased, and the impact force is reduced.

[0054] Further, the gap groove 7 communicates with the end surface of the piston 2.

[0055] The oil liquid can also enter the oil passage hole 4 through the gap groove 7 to form a throttling effect, and as the distance between the end surface of the piston 2 and the oil passage hole 4 increases, the resistance of the gap groove 7 continuously increases, and the oil flow gradually decreases, which facilitates the continuous deceleration of the piston 2, the piston 2 is stable in force, and the impact force is reduced; meanwhile, the failure of the deceleration effect caused by the blockage of the throttle hole 6 is avoided, and the safety is improved.

[0056] Further, the throttle structure is provided at both ends of the piston 2.

[0057] The extension and retraction strokes of the oil cylinder each have a deceleration process, which reduces impact force and prolongs the service life of the oil cylinder.

[0058] In the description of the utility model, it is understood that if the description of the direction, direction or position relationship appears, for example: "center", "vertical", "horizontal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like, the direction or position relationship indicated in the specification is based on the direction or position relationship shown in the drawing, and is only for the convenience of understanding the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated part, element or whole must have a particular orientation, structure and operation, and therefore cannot be understood as a limitation on the utility model.

[0059] In addition, if the order description language appears, for example: "first", "second" and the like, the use in the specification is for the convenience of understanding or simplifying the description, for example, in order to distinguish a plurality of technical features of the same type or function, and it is necessary to mention separately, and the specification may adopt the way of prefix or suffix order description language to distinguish them. Therefore, it cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features limited by "first", "second" can be explicitly or implicitly included at least one feature. In the description of the utility model, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0060] In the utility model, if the structure relative action relationship description language is adopted, for example: "installation", "connection", "connection", "fixing" and the like, unless otherwise specified and limited, it should be understood in a broad sense. For example, "installation", "connection", "connection" and the like, can be fixed connection, or detachable connection, or integrated; can be mechanical connection, or electrical connection; can be directly connected, or indirectly connected through intermediate medium; can be the communication or interaction relationship between two elements; "fixed" can be integrated fixed, or detachable fixed through fastener; can be direct fixation, or fixation through intermediate medium. For ordinary skilled persons in the art, the specific meaning of the above description language in the utility model can be understood according to the specific situation, the context, the text meaning coherence of the preceding and subsequent texts and the like.

[0061] In the utility model, if the description language containing the accessory or the connection meaning appears, for example, the first feature is on or under the second feature, unless another explicit provision and limitation, should not be limited understanding, for example, "on" or "under" can be the first and second features directly contact, also can be the first feature and the second feature indirectly contact through the intermediate medium. For the ordinary skilled person in the art, can understand the specific meaning of the above description language in the utility model according to specific circumstances, the context, the text meaning coherence of the preceding and following text etc.

[0062] Further, the first feature is on, above and on the second feature can be the first feature is directly above or obliquely above the second feature, or just indicates that the first feature is higher than the second feature in horizontal height. The first feature is below, under and under the second feature can be the first feature is directly below or obliquely below the second feature, or just indicates that the first feature is less than the second feature in horizontal height.

[0063] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In the specification, the illustrative description of the above terms is not necessarily for the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, the skilled in the art can combine and combine the different embodiments, examples and features of different embodiments, examples described in the specification without contradiction, which should be included in the scope of the utility model.

[0064] Although the embodiments of the utility model have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the utility model, within the scope of information available to the public, the skilled in the art can make changes, modifications, replacements and modifications to the above embodiments, still can be covered in the protection scope of the application.

Claims

1. A reduced speed hydraulic cylinder characterized by: The cylinder (1) is provided with a piston (2) inside, one end of the piston (2) is provided with a rod (3), one end of the rod (3) extends out of the cylinder (1); the side wall of the end of the cylinder (1) is provided with an oil hole (4), at least one end of the piston (2) is provided with a throttling structure, when the side surface of the end of the piston (2) where the throttling structure is located coincides with the oil hole (4) of the corresponding end of the cylinder (1), the throttling structure communicates with the oil hole (4).

2. The reduced speed hydraulic cylinder of claim 1, wherein: The throttling structure includes a buffer groove (5) and a throttling hole (6), the buffer groove (5) is arranged on the end surface of the piston (2), one end of the throttling hole (6) extends to the side wall of the buffer groove (5), and the other end extends to the side surface of the piston (2); when the side surface of the end of the piston (2) where the throttling structure is located coincides with the oil hole (4) of the corresponding end of the cylinder (1), the throttling hole (6) communicates with the oil hole (4).

3. The reduced speed hydraulic cylinder of claim 2, wherein: The throttling hole (6) is at least provided with two and is distributed along the axial direction of the piston (2).

4. The reduced speed hydraulic cylinder of claim 3, wherein: The diameter of the throttling hole (6) decreases in turn from the end surface of the piston (2) to the middle part of the piston (2).

5. The reduced speed hydraulic cylinder of claim 4, wherein: The diameter of the first throttling hole (6) is twice the diameter of the second throttling hole (6) from the end surface of the piston (2) to the middle part of the piston (2).

6. The reduced speed hydraulic cylinder of claim 2, wherein: The throttling hole (6) extends along the radial direction of the piston (2).

7. A reduced speed hydraulic ram as claimed in any one of claims 2 to 6 wherein: The side surface of the piston (2) is also provided with an annular gap groove (7), and the other end of the throttling hole (6) extends to the bottom of the gap groove (7).

8. The reduced speed hydraulic cylinder of claim 7, wherein: In the case that the throttling hole (6) is at least provided with two and is distributed along the axial direction of the piston (2); the gap groove (7) is at least provided with two, each throttling hole (6) corresponds to and communicates with a gap groove (7).

9. The reduced speed hydraulic cylinder of claim 8, wherein: The gap groove (7) communicates with the end surface of the piston (2).

10. The reduced speed hydraulic cylinder of claim 1, wherein: Both ends of the piston (2) are provided with a throttling structure.

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