Hydraulic damping valve

Abstract

The hydraulic damping valve comprises a shell, a damping cavity is formed in the shell, a damping piston, an auxiliary block and an elastic piece are arranged in the damping cavity, and the auxiliary block and the elastic piece are matched with the damping piston. The hydraulic damping valve is connected to the hydraulic energy supply structure and communicated with the hydraulic energy supply structure, hydraulic pressure generated by sudden change or pressure wave crests, especially instantly generated by the sudden change or pressure wave crests and the hydraulic damping valve is transmitted to the hydraulic damping valve, and sudden change pressure change in the hydraulic energy supply structure is balanced through the hydraulic damping valve; the pressure of the sudden change or the wave crest is reduced and directly transmitted to the target structure, so that the hydraulic pressure in the hydraulic energy supply structure is stably output, the influence of the sudden change (especially the increase) of the pressure generated in the hydraulic energy supply structure and the overlarge pressure wave crest on the product control hydraulic stability is avoided, and the influence of the unstable output pressure of the product is further avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of shock-absorbing valves, and particularly to a hydraulic shock-absorbing valve. Background Art

[0002] In existing power equipment or devices, hydraulic energy supply has become a common functional mode, such as hydraulic energy supply structures like oil cylinders and oil circuits. However, in the above-mentioned hydraulic energy supply structures, due to the influence of the use environment or unstable factors during use (such as vibration, uneven force on the force-bearing structure, uneven force transmission of the force-bearing structure, poor lubrication, etc.), the pressure of the hydraulic oil in the above-mentioned hydraulic energy supply structure is unstable, thereby reducing the stability of the control of the above-mentioned hydraulic force-bearing structure. Summary of the Invention

[0003] To solve the above technical problems, the present invention provides a hydraulic shock-absorbing valve, which includes a housing. A shock-absorbing cavity is formed in the housing. A shock-absorbing piston is arranged in the shock-absorbing cavity. The shock-absorbing piston or a seal arranged on the shock-absorbing piston is in sliding seal with the inner wall of the shock-absorbing cavity. The shock-absorbing cavity is partitioned by the shock-absorbing piston or the seal into a shock-absorbing driving cavity and a shock-absorbing control cavity that are connected to the hydraulic energy supply structure. An auxiliary block is connected in the shock-absorbing control cavity or at the free end of the shock-absorbing control cavity. An elastic member that is compressed under the push of the shock-absorbing piston and returns to its original position when there is no hydraulic action is arranged between the shock-absorbing piston and the auxiliary block. By connecting a hydraulic shock-absorbing valve to the hydraulic energy supply structure and through the connection between the two, sudden changes or pressure peaks, especially the hydraulic pressure generated instantaneously between the two, are transmitted to the hydraulic shock-absorbing valve. The hydraulic shock-absorbing valve is used to balance the sudden pressure changes in the hydraulic energy supply structure, reduce the direct transmission of the pressure after the sudden change or the pressure peak to the target structure (for example: clutch), so that the hydraulic pressure in the hydraulic energy supply structure is output smoothly, and avoid the influence of the pressure sudden change (especially increase) and the excessive pressure peak generated in the hydraulic energy supply structure on the hydraulic stability of the product, and further avoid the influence of the unstable output pressure of the product. Furthermore, a shock-absorbing piston and an elastic member cooperating with it are arranged in the hydraulic shock-absorbing valve. The hydraulic oil pressure after the sudden change or the pressure peak is transmitted to the shock-absorbing piston, and then the elastic member is compressed. The sudden pressure of the hydraulic medium is buffered by the compression of the elastic member, so that the hydraulic pressure in the hydraulic energy supply structure is output smoothly.

[0004] In an embodiment, the elastic member is at least one shock-absorbing spring, and two ends of the shock-absorbing spring respectively abut against the shock-absorbing piston and the auxiliary block. By adopting a common spring design, the design cost is reduced, and it can be selected according to the elastic coefficient.

[0005] In one embodiment, the elastic member is at least one shock-absorbing group composed of shock-absorbing sheets. By replacing the shock-absorbing spring with a shock-absorbing group composed of shock-absorbing sheets, problems such as hydraulic instability and excessive hydraulic volume consumption caused by excessive movement stroke of the shock-absorbing spring can be avoided, which is beneficial to the control of the volume of the hydraulic medium supply end and improves the system stroke efficiency. For another example, the shock-absorbing group is composed of multiple groups of shock-absorbing sheets and can be used in a stacked manner. If multiple springs are combined, connectors or connection structures need to be added, resulting in a complex structure and affecting the performance stability.

[0006] In one embodiment, the elastic member is composed of at least one shock-absorbing spring and at least one shock-absorbing group composed of shock-absorbing sheets. By combining the shock-absorbing spring and the shock-absorbing group, the advantages of both can be utilized, reducing the setting of connectors and improving the performance stability of the system.

[0007] In one embodiment, the elastic member includes one shock-absorbing spring, a first shock-absorbing group and a second shock-absorbing group composed of shock-absorbing sheets. The shock-absorbing sheet is an annular structure having at least a bent portion. A first columnar protrusion or a first groove is formed at the end of the shock-absorbing piston close to the auxiliary block, and a second columnar protrusion or a second groove is formed at the end of the auxiliary block close to the shock-absorbing piston. The first shock-absorbing group is sleeved on the first columnar protrusion or placed in the first groove, one end of the shock-absorbing spring is sleeved on the second columnar protrusion or placed in the second groove, and the shock-absorbing spring abuts against the bent portion of the first shock-absorbing group. The second shock-absorbing group is sleeved on the end of the auxiliary block close to the shock-absorbing piston, and a driving end for compressing the second shock-absorbing group under the action of oil pressure is formed at the end of the shock-absorbing piston close to the auxiliary block.

[0008] Furthermore, the elastic coefficient of the shock-absorbing spring is greater than that of the second shock-absorbing group, and the elastic coefficient of the second shock-absorbing group is greater than that of the first shock-absorbing group.

[0009] By setting a shock-absorbing spring and two shock-absorbing groups composed of shock-absorbing plates, and then setting the elastic coefficients among the three, when in use, when the hydraulic pressure reaches the design parameters, the space between the compression plates of the first compression group and the second compression group is compressed first, and the shock-absorbing spring does not move; then, the first compression group basically does not deform anymore, and as the hydraulic pressure continues to increase, the compression plates of the second compression group continue to be compressed, and the shock-absorbing spring does not move or is slightly compressed; finally, as the oil pressure continues to increase, the second compression group basically does not deform anymore, and continues to compress the shock-absorbing spring. The above-mentioned use process refers to the extent to which the hydraulic pressure can compress the compression spring. Of course, in actual use, the hydraulic pressure may not always reach the above-mentioned extent. The change process of the above-mentioned elastic member is related to the pressure of the hydraulic pressure and can be part of the above-mentioned process; at the same time, the specific compression change process of the elastic member is related to the selected elastic coefficient. For example, in part of the above-mentioned process, the two elastic members may be compressed together. Of course, the elastic member with a small elastic coefficient is quickly compressed to the limit. Through the above-mentioned specific setting of the elastic parts, the short-range compression space of the shock-absorbing group composed of elastic sheets can be effectively utilized, which improves the stability of the hydraulic pressure when the hydraulic pressure suddenly changes, and at the same time, the hydraulic volume consumption is not too large, the volume control of the liquid supply end is improved, and the system stroke efficiency is guaranteed; at the same time, the application of double shock-absorbing groups can provide a variety of application combinations to adapt to a variety of scenarios; finally, by setting the shock-absorbing spring with the largest elastic coefficient, it plays the role of the last bottom line. For example, when the pressure increases greatly, it avoids the shock-absorbing group from being unable to play a shock-absorbing role due to the short stroke. Through the combination of a large elastic coefficient and a stroke greater than the shock-absorbing group, the hydraulic stability is guaranteed as much as possible, and the system stroke and work efficiency are guaranteed. The above-mentioned setting can realize a step-by-step filtering shock-absorbing mode, that is, by setting different elastic coefficients, a step-by-step shock-absorbing mode from small to large under different pressure changes can be realized.

[0010] In one embodiment, a sealing ring is provided between the auxiliary block and the damping control chamber; a breathing channel penetrating the auxiliary block is formed in the auxiliary block, and a filter element structure is provided at the end of the breathing channel close to the atmosphere. By providing the breathing channel and the filter element structure, the sensitivity of the damping valve can be improved and dust can be prevented from entering the damping control chamber.

[0011] In one embodiment, the end of the breathing channel close to the filter element structure is expanded outward to form an annular groove. By forming the annular groove, when inhaling, the annular groove is used to block the tiny moisture brought in, reducing the moisture entering the shock absorber valve; when exhaling, the tiny moisture in the annular groove can be discharged by backblowing, and at the same time, dust is adsorbed on the surface of the filter element during inhalation and is removed by backblowing during exhalation.

[0012] In one embodiment, the housing is integrally formed with the outer shell of the hydraulic energy supply structure. The integral molding design can reduce oil circuit connections, reduce the possibility of leakage, and avoid shock absorption failure as much as possible. Of course, the overall volume design can also be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the specific implementation modes of the present invention, the following briefly introduces the drawings required for use in the specific implementation modes. Obviously, the drawings described below are some implementation modes of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0014] Figure 1 Is a schematic diagram of the structure of the hydraulic shock absorber valve of the present invention; Figure 2 It is a structural schematic diagram of a shock absorbing sheet of the present invention; Figure 3 It is an arrangement diagram of a shock absorbing group of the present invention; Figure 4 It is a structural schematic diagram of an application of the hydraulic shock absorbing valve of the present invention; The reference numerals in the figure are represented as follows: 1-housing; 2-shock-absorbing piston; 3-sealing element; 4-shock-absorbing driving chamber; 5-shock-absorbing control chamber; 6-auxiliary block; 7-shock-absorbing spring; 8-first shock-absorbing group; 9-second shock-absorbing group; 10-shock-absorbing plate; 11-bending portion; 12-first columnar protrusion; 13-second groove; 14-driving end; 15-sealing ring; 16-breathing channel; 17-filter element structure; 18-annular groove; 19-liquid channel. DETAILED DESCRIPTION

[0015] The following is a clear and complete description of the content of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. The embodiments in the present invention and other embodiments obtained by ordinary technicians in this field without creative work are all within the scope of protection of the present invention.

[0016] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0017] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other. Embodiment 1

[0018] This embodiment discloses a hydraulic shock absorber valve, which can be connected to a hydraulic energy supply structure to balance the buffer adjustment in the case of hydraulic mutation, especially when it becomes larger, in the hydraulic energy supply structure. For example, Figure 1 , it includes a housing 1. The housing 1 can be set separately or integrally with the outer shell of the hydraulic energy supply structure. A shock-absorbing cavity is formed inside the housing 1. A shock-absorbing piston 2 is arranged in the shock-absorbing cavity. The shock-absorbing piston 2 or a seal 3 arranged on the shock-absorbing piston 2 is in sliding seal with the inner wall of the shock-absorbing cavity. In this embodiment, it is preferably the seal 3 arranged on the shock-absorbing piston 2 that is in sliding seal with the inner wall of the shock-absorbing cavity. The seal 3 is preferably an O-ring or a piston ring, such as a lip seal; the shock-absorbing cavity is separated by the shock-absorbing piston or the seal into a shock-absorbing driving cavity 4 communicating with the hydraulic energy supply structure and a shock-absorbing control cavity 5 not communicating with the hydraulic energy supply structure. In this embodiment, the hydraulic energy supply structure is preferably a clutch booster. The housing 1 is integrally formed with a hydraulic cylinder and is communicated through a liquid channel 19, as Figure 4 shown; an auxiliary block 6 is connected inside the shock-absorbing control cavity 5 or at the free end of the shock-absorbing control cavity 5. Preferably, the auxiliary block 6 is connected at the free end of the shock-absorbing control cavity 5. As for the connection method between the two, there are various ways. In this embodiment, it is preferably connected by a threaded structure, that is, the auxiliary block 6 is provided with an external thread, and the shock-absorbing control cavity 5 is provided with an internal thread. During use, the auxiliary block 6 is screwed into the shock-absorbing control cavity 5; an elastic member that is compressed under the push of the shock-absorbing piston 2 and returns when there is no hydraulic action on the shock-absorbing piston 2 is arranged between the shock-absorbing piston 2 and the auxiliary block 6. The setting of the elastic member is various.

[0019] In one embodiment, the elastic member is at least one shock-absorbing spring, and both ends of one shock-absorbing spring or a combination of multiple shock-absorbing springs are respectively abutted against the shock-absorbing piston 2 and the auxiliary block 6.

[0020] In one embodiment, the elastic member is at least one shock-absorbing group composed of shock-absorbing sheets. As for the positional relationship between the shock-absorbing group, the shock-absorbing piston 2 and the auxiliary block 6, it needs to be determined according to the number of groups and the specific structure.

[0021] In one embodiment, the elastic member is composed of a shock-absorbing spring and a shock-absorbing group composed of shock-absorbing sheets. The number of shock-absorbing springs and the number of shock-absorbing groups are various and are determined according to the specific design and the specific structure. In this embodiment, the elastic member includes one shock-absorbing spring 7 and a first shock-absorbing group 8 and a second shock-absorbing group 9 composed of shock-absorbing sheets 10. Specifically, the shock-absorbing sheet 10 is an annular structure having at least a bent portion 11. Of course, the structure of the bent portion 11 is various. Preferably, the bent portion 11 is an annular bend, as Figure 1 shown; in addition to the bent portion 11, the shock-absorbing sheet 10 may further include other parts. One example is as Figure 2 shown; a first columnar protrusion or a first groove is formed at the end of the shock-absorbing piston 2 close to the auxiliary block 6, and a second columnar protrusion or a second groove is formed at the end of the auxiliary block 6 close to the shock-absorbing piston 2; the first shock-absorbing group 8 is sleeved on the first columnar protrusion or placed in the first groove, one end of the shock-absorbing spring 7 is sleeved on the second columnar protrusion or placed in the second groove, and the shock-absorbing spring 7 abuts against the bent portion of the first shock-absorbing group 8. In this embodiment, as Figure 1 shown, a first columnar protrusion 12 is formed at the end of the shock-absorbing piston 2 close to the auxiliary block 6, and a second groove 13 is formed at the end of the auxiliary block 6 close to the shock-absorbing piston 2; the first shock-absorbing group 8 is sleeved on the first columnar protrusion 12, and one end of the shock-absorbing spring 7 is placed in the second groove 13. The second shock-absorbing group 9 is sleeved on the end of the auxiliary block 6 close to the shock-absorbing piston 2, and a structure for supporting one end of the second shock-absorbing group 9, such as a stepped structure, is formed on the auxiliary block 6, and a driving end 14 for compressing the second shock-absorbing group 9 under hydraulic action is formed at the end of the shock-absorbing piston 2 close to the auxiliary block 6. The structure of the driving end 14 is various. Preferably, it is an annular structure, as Figure 1 shown. As for the combination forms of the shock-absorbing sheets of the first shock-absorbing group 8 and the second shock-absorbing group 9, they are various, as Figure 1 shown, two adjacent shock-absorbing sheets are combined back to back or in the reverse direction, or as in the combination of the first shock-absorbing group 8 in Figure 3 wherein a part is combined in the same direction, and the other part is also combined in the same direction, and these two parts are combined back to back or in the reverse direction.

[0022] In one embodiment, the elastic coefficient of the shock-absorbing spring 7 is greater than the elastic coefficient of the second shock-absorbing group 9, and the elastic coefficient of the second shock-absorbing group 9 is greater than the elastic coefficient of the first shock-absorbing group 8.

[0023] In one embodiment, a sealing ring 15 is provided between the auxiliary block 6 and the shock absorption control cavity 5; a breathing channel 16 penetrating through the auxiliary block 6 is formed in the auxiliary block 6, and a filter element structure 17 is provided at the end of the breathing channel 16 close to the atmosphere.

[0024] In one embodiment, the end of the breathing channel 16 close to the filter element structure 17 expands to form an annular groove 18, and the structure of the annular groove 18 is various, such as Figure 1 As shown, the cross-section of the annular groove 18 is two triangles up and down. At this time, the side wall of the port of the breathing channel 16 at this place forms a frustum structure. When the structure of the annular groove 18 is the above structure, it can maximize the avoidance of moisture in the air entering the shock absorber valve and maximize the removal of the accumulated moisture in the annular groove 18 during exhalation.

[0025] The use process of the present invention is as follows: Taking the combination of the hydraulic shock absorber valve and the clutch booster as an example, when the pressure in the hydraulic cylinder increases too fast due to mutation or peak segment, the hydraulic oil pushes the shock piston to slide towards the position of the auxiliary block, and then compresses the shock absorption group and the shock absorption spring during the sliding process; when the pressure in the hydraulic cylinder decreases, the shock piston slides in the reverse direction, and the shock absorption group and the shock absorption spring gradually reset to the maximum extent.

[0026] Obviously, the above embodiments are only examples for clear illustration and not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. And the obvious changes or modifications derived therefrom are still within the protection scope of the present invention.

Claims

1. A hydraulic shock absorbing valve, characterized in that: It includes a shell, a shock-absorbing cavity is formed in the shell, a shock-absorbing piston is arranged in the shock-absorbing cavity, the shock-absorbing piston or a seal arranged on the shock-absorbing piston is slidably sealed with the inner wall of the shock-absorbing cavity; the shock-absorbing cavity is divided by the shock-absorbing piston or the seal into a shock-absorbing driving cavity and a shock-absorbing control cavity which are connected to the hydraulic power supply structure; an auxiliary block is connected in the shock-absorbing control cavity or at the free end of the shock-absorbing control cavity; an elastic member is arranged between the shock-absorbing piston and the auxiliary block, which is compressed by the shock-absorbing piston and reset when there is no hydraulic action.

2. The hydraulic shock absorber valve according to claim 1, characterized in that: The elastic member is at least one shock absorbing spring, and two ends of the shock absorbing spring are respectively in contact with the shock absorbing piston and the auxiliary block.

3. The hydraulic shock absorbing valve according to claim 1, characterized in that: The elastic member is at least one shock-absorbing group consisting of shock-absorbing sheets.

4. The hydraulic shock absorber valve according to claim 1, characterized in that: The elastic member is composed of at least one shock absorbing spring and at least one shock absorbing group composed of shock absorbing sheets.

5. The hydraulic shock absorbing valve according to claim 4, characterized in that: The elastic member comprises a shock absorbing spring and a first shock absorbing group and a second shock absorbing group consisting of shock absorbing sheets.

6. The hydraulic shock absorbing valve according to claim 5, characterized in that: The shock-absorbing plate is an annular structure with at least a bent portion, and a first columnar protrusion or a first groove is formed at the end of the shock-absorbing piston close to the auxiliary block, and a second columnar protrusion or a second groove is formed at the end of the auxiliary block close to the shock-absorbing piston; the first shock-absorbing group is sleeved on the first columnar protrusion or placed in the first groove, one end of the shock-absorbing spring is sleeved on the second columnar protrusion or placed in the second groove, and the shock-absorbing spring abuts against the bent portion of the first shock-absorbing group; the second shock-absorbing group is sleeved on the end of the auxiliary block close to the shock-absorbing piston, and the end of the shock-absorbing piston close to the auxiliary block forms a driving end that compresses the second shock-absorbing group under the action of oil pressure.

7. The hydraulic shock absorbing valve according to claim 6, characterized in that: The elastic coefficient of the shock absorbing spring is greater than the elastic coefficient of the second shock absorbing group, and the elastic coefficient of the second shock absorbing group is greater than the elastic coefficient of the first shock absorbing group.

8. The hydraulic shock absorber valve according to any one of claims 1 to 7, characterized in that: A sealing ring is arranged between the auxiliary block and the shock absorption control chamber; a breathing channel penetrating the auxiliary block is formed in the auxiliary block, and a filter element structure is arranged at the end of the breathing channel close to the atmosphere.

9. The hydraulic shock absorbing valve according to claim 8, characterized in that: The end of the breathing channel close to the filter element structure expands outward to form an annular groove.

10. The hydraulic shock absorber valve according to any one of claims 1 to 7, characterized in that: The housing is integrally formed with the outer shell of the hydraulic energy supply structure.

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