CN113983113A - Shock absorber for floating slab track bed - Google Patents
Shock absorber for floating slab track bed Download PDFInfo
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- CN113983113A CN113983113A CN202111362807.6A CN202111362807A CN113983113A CN 113983113 A CN113983113 A CN 113983113A CN 202111362807 A CN202111362807 A CN 202111362807A CN 113983113 A CN113983113 A CN 113983113A
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- piston rod
- oil
- oil duct
- piston
- cylinder
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- 238000007667 floating Methods 0.000 title claims abstract description 56
- 239000006096 absorbing agent Substances 0.000 title claims abstract description 22
- 230000035939 shock Effects 0.000 title claims abstract description 21
- 239000007788 liquid Substances 0.000 claims abstract description 3
- 238000007789 sealing Methods 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 5
- 238000013016 damping Methods 0.000 abstract description 10
- 230000008093 supporting effect Effects 0.000 abstract description 10
- 230000000694 effects Effects 0.000 description 8
- 230000009471 action Effects 0.000 description 5
- 230000009467 reduction Effects 0.000 description 5
- 230000008569 process Effects 0.000 description 4
- 238000005265 energy consumption Methods 0.000 description 3
- 238000003754 machining Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/3207—Constructional features
- F16F9/3235—Constructional features of cylinders
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F13/00—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs
- F16F13/005—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs comprising both a wound spring and a damper, e.g. a friction damper
- F16F13/007—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs comprising both a wound spring and a damper, e.g. a friction damper the damper being a fluid damper
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B1/00—Ballastway; Other means for supporting the sleepers or the track; Drainage of the ballastway
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B19/00—Protection of permanent way against development of dust or against the effect of wind, sun, frost, or corrosion; Means to reduce development of noise
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/10—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using liquid only; using a fluid of which the nature is immaterial
- F16F9/14—Devices with one or more members, e.g. pistons, vanes, moving to and fro in chambers and using throttling effect
- F16F9/16—Devices with one or more members, e.g. pistons, vanes, moving to and fro in chambers and using throttling effect involving only straight-line movement of the effective parts
- F16F9/18—Devices with one or more members, e.g. pistons, vanes, moving to and fro in chambers and using throttling effect involving only straight-line movement of the effective parts with a closed cylinder and a piston separating two or more working spaces therein
- F16F9/19—Devices with one or more members, e.g. pistons, vanes, moving to and fro in chambers and using throttling effect involving only straight-line movement of the effective parts with a closed cylinder and a piston separating two or more working spaces therein with a single cylinder and of single-tube type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/3207—Constructional features
- F16F9/3214—Constructional features of pistons
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/34—Special valve constructions; Shape or construction of throttling passages
- F16F9/3405—Throttling passages in or on piston body, e.g. slots
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/36—Special sealings, including sealings or guides for piston-rods
- F16F9/362—Combination of sealing and guide arrangements for piston rods
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/50—Special means providing automatic damping adjustment, i.e. self-adjustment of damping by particular sliding movements of a valve element, other than flexions or displacement of valve discs; Special means providing self-adjustment of spring characteristics
- F16F9/512—Means responsive to load action, i.e. static load on the damper or dynamic fluid pressure changes in the damper, e.g. due to changes in velocity
- F16F9/5123—Means responsive to load action, i.e. static load on the damper or dynamic fluid pressure changes in the damper, e.g. due to changes in velocity responsive to the static or steady-state load on the damper
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Fluid-Damping Devices (AREA)
Abstract
The invention relates to the field of rail transit, in particular to a shock absorber for a floating slab track bed, which comprises a piston assembly and a cylinder; the piston assembly comprises a piston rod, a first end of the piston rod extends into the cylinder, a second end of the piston rod extends out of the cylinder, and the piston rod can move along the axial direction of the cylinder; oil liquid is filled in the cylinder; the cylinder body is connected with a foundation, and the second end of the piston rod is connected with the floating slab track bed; the piston assembly comprises a torsion structure and a spring assembly; the torsion structure is connected with the piston rod and moves along with the piston rod, and the cylinder is separated to form an upper cavity and a lower cavity; the spring assembly is respectively connected with the piston assembly and the cylinder body; the torsion structure is internally provided with a normally-broken oil duct, and the oil duct is communicated after the load borne by the piston rod is increased. The invention can improve the vibration damping performance when a vehicle passes through, improve the rigidity of the vibration damper when the vehicle does not pass through, and ensure the supporting effect on the floating plate track bed.
Description
Technical Field
The invention relates to the field of rail transit, in particular to a shock absorber of a floating slab track bed.
Background
In rail transit, when the vehicle passes through the track, the vibration that arouses will be transmitted to on the ground, will cause the destruction to the ground, influences the firm degree of ground. In addition, noise is generated in the vibration transmission process, and the influence on the life of residents is caused. To reduce the influence of vibrations generated when a vehicle passes. In the prior art, a steel spring floating slab track bed is designed to reduce the vibration transmitted to the foundation. However, in the floating track bed structure, the damping element is only required to perform a vibration damping function when the vehicle passes through, and the floating track bed is required to be supported when the vehicle does not pass through. The stiffness of the damping elements used in prior art floating slab track beds is often fixed, such as the low frequency floating slab track disclosed in chinese patent publication No. CN 102535260B. The fixed stiffness damping elements are difficult to guarantee both the damping effect and the supporting effect on the floating slab track bed.
Disclosure of Invention
The invention aims to overcome the defect that the vibration reduction effect and the supporting effect on a floating slab track bed are difficult to be considered simultaneously in the floating slab track bed, and provides a damper which is applied to the floating slab track bed and can improve the vibration reduction performance when a vehicle passes through and improve the rigidity when the vehicle does not pass through.
A shock absorber for a floating ballast bed comprises a piston assembly and a cylinder; the piston assembly comprises a piston rod, a first end of the piston rod extends into the cylinder, a second end of the piston rod extends out of the cylinder, and the piston rod can move along the axial direction of the cylinder; oil liquid is filled in the cylinder;
the cylinder body is connected with a foundation, and the second end of the piston rod is connected with the floating slab track bed;
the piston assembly comprises a torsion structure and a spring assembly; the torsion structure is connected with the piston rod and moves along with the piston rod, and the cylinder is separated to form an upper cavity and a lower cavity; the spring assembly is respectively connected with the piston assembly and the cylinder body;
the torsion structure is internally provided with a normally-broken oil duct, and the oil duct is communicated after the load borne by the piston rod is increased.
Further, the torsion structure comprises a torsion block, a torsion spring and a secondary piston; the torsion block is rotatably sleeved on the piston rod; one end of the torsion spring is connected with the torsion block, and the other end of the torsion spring is connected with the auxiliary piston; the periphery of the twisting block is provided with a first guide bulge, the inner wall of the cylinder is provided with a first guide groove extending along the axial direction of the cylinder, the first guide bulge is movably arranged in the first guide groove, and the first guide groove guides the twisting block to rotate; the oil passage comprises a main oil passage arranged in the piston rod and an auxiliary oil passage arranged in the torsion block; the head end of the main oil duct is communicated with the upper cavity, and the tail end of the auxiliary oil duct is communicated with the lower cavity; the on-off between the tail end of the main oil duct and the head end of the auxiliary oil duct is determined by the relative position relationship between the torsion block and the piston rod; and when the piston rod is in a normal loaded state, the tail end of the main oil duct is disconnected with the head end of the auxiliary oil duct.
Further, the main oil gallery includes a first oil gallery, a second oil gallery, and a third oil gallery; the first oil duct extends along the radial direction of the piston rod and is communicated with the upper cavity and the second oil duct; the second oil duct extends along the axial direction of the piston rod and is communicated with the third oil duct; the third oil duct extends along the radial direction of the piston rod and comprises a first oil port communicated with the outside of the piston rod;
the auxiliary oil passage comprises a fourth oil passage and a fifth oil passage; the fourth oil duct extends along the radial direction of the piston rod, is communicated with the fifth oil duct and comprises a second oil port communicated with the outside of the twisting block; the fifth oil duct extends along the axial direction of the piston rod and is communicated with the lower cavity;
the third oil duct and the fourth oil duct are positioned at the same horizontal height; when the twisting block rotates to the position that the first oil port is overlapped with the second oil port, the third oil duct is communicated with the fourth oil duct; when the twisting block rotates until the first oil port and the second oil port are not overlapped, the third oil duct and the fourth oil duct are disconnected.
Furthermore, the first guide groove sequentially comprises a straight line section and a threaded section along the direction gradually far away from the second end of the piston rod.
Furthermore, a second guide bulge is arranged on the circumference of the auxiliary piston; a second guide groove is formed in the inner wall of the cylinder body, and the axis of the second guide groove is parallel to the axis of the straight line section of the first guide groove; the second guide protrusion is movably arranged in the second guide groove.
Further, the torsion structure further comprises a piston body and a thrust roller bearing; the piston body is fixedly connected with the piston rod, one end of the thrust roller bearing is abutted against the piston body, and the other end of the thrust roller bearing is abutted against the torsion block.
Further, the spring assembly comprises a first spring and a second spring; the first spring is sleeved on the piston rod, one end of the first spring is abutted against the top cover, and the other end of the first spring is abutted against the piston body; the second spring is arranged in the lower cavity, one end of the second spring is abutted against the bottom cover, and the other end of the second spring is abutted against the auxiliary piston.
Furthermore, gaps for containing oil to pass through are reserved between each part of the piston assembly and the inner wall of the cylinder body all the time.
Further, the cylinder body comprises a top cover, a cylinder body and a bottom cover which are connected in sequence; the top cover is provided with a through hole for the piston rod to pass through.
Furthermore, a sealing groove is formed in the top cover, and a sealing assembly for sealing the top cover and the piston rod is filled in the sealing groove.
Has the advantages that: according to the shock absorber for the floating slab track bed, when a vehicle passes through the floating slab track bed, the load of the floating slab track bed is increased, so that the load of a piston rod is increased, an oil duct is communicated, oil is exchanged between a lower cavity and an upper cavity, energy is further consumed, and the shock absorption effect is improved; when the vehicle does not pass through the floating slab track bed, the shock absorber is in a normal working state, and the oil duct is in a disconnected state, so that the rigidity of the shock absorber is improved, and the supporting effect on the floating slab track bed is ensured. Therefore, the vibration absorber for the floating slab track bed disclosed by the invention automatically controls the on-off of the oil duct according to the load change of the vehicle in two states of passing and not passing, and simultaneously considers the vibration absorbing effect and the supporting effect on the floating slab track bed.
Drawings
FIG. 1 is an axial cross-sectional view of a shock absorber in an embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view taken along A-A of FIG. 1;
FIG. 3 is a schematic cross-sectional view taken along B-B of FIG. 1;
FIG. 4 is a schematic view of a piston rod and a torsion block according to an embodiment of the present invention;
fig. 5 is a schematic cross-sectional view of the barrel and the bottom cap along the axial direction thereof according to the embodiment of the invention.
Reference numerals: 1. a piston rod; 2. twisting the block; 3. a torsion spring; 4. a secondary piston; 5. an upper cavity; 6. a first cavity; 7. a second cavity; 8. a first oil passage; 9. a second oil passage; 10. a third oil passage; 11. a fourth oil passage; 12. a fifth oil passage; 13. a first oil port; 14. a second oil port; 15. an auxiliary oil passage; 16. a first guide projection; 17. a first guide groove; 18. a second guide projection; 19. a second guide groove; 20. a top cover; 21. a barrel body; 22. a bottom cover; 23. a flange plate; 24. a thrust roller bearing; 25. a straight line segment; 26. a helical section; 27. a piston body.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all embodiments. 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 application.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention; the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; furthermore, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, as they may be fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Examples
The present embodiment provides a damper for a floating ballast bed, as shown in fig. 1, which includes a piston assembly and a cylinder; the piston assembly comprises a piston rod 1, a torsion structure and a spring assembly; the first end of the piston rod 1 extends into the cylinder, the second end of the piston rod extends out of the cylinder, and the piston rod 1 can move along the axial direction of the cylinder; the torsion structure is arranged in the cylinder body, is connected with the piston rod 1 and moves along with the piston rod 1; the spring assembly is arranged in the cylinder body and is respectively connected with the piston assembly and the cylinder body; the cylinder is filled with oil. The first end and the second end of the piston rod 1 respectively refer to two opposite ends of the piston rod 1 along the axial direction of the piston rod, and the second end of the piston rod is connected with the floating slab track bed to bear the load applied by the floating slab track bed; the end of the cylinder body far away from the second end is connected with the foundation.
The shock absorber takes a piston assembly, oil and a spring assembly as damping elements; when the train passes through the floating slab track bed, the damping element consumes energy, thereby playing a role in damping vibration; when the train does not pass through the floating slab track bed, the shock absorber has certain rigidity, so that the shock absorber plays a role in supporting the floating slab.
In order to give consideration to the vibration damping effect when a train passes through and the supporting effect of the train on the floating slab track bed when the train does not pass through, a normally-broken oil duct is arranged in the torsion structure. When a train passes through, the load borne by the piston rod 1 is increased, and then the oil duct is communicated, so that an oil exchange channel is additionally arranged between the upper cavity 5 and the lower cavity, the energy consumption is improved, and the vibration reduction effect is improved. After the train leaves, the load borne by the piston rod 1 is reduced, and the oil duct is restored to a normally-off state, so that the rigidity of the shock absorber is improved, and the supporting effect on the floating slab track bed is ensured.
Specifically, referring to fig. 1, the torsion structure includes a torsion block 2, a torsion spring 3, and a sub-piston 4; the twisting block 2 is rotatably sleeved on the rod of the piston rod 1 and can move along with the piston rod 1; the torsion block 2 divides the interior of the cylinder into an upper cavity 5 and a lower cavity, the torsion spring 3 and the auxiliary piston 4 are respectively arranged in the lower cavity, two ends of the torsion spring 3 are respectively connected with the torsion block 2 and the auxiliary piston 4, and the torsion block 2 and the auxiliary piston 4 can relatively rotate by overcoming the elasticity of the torsion spring 3. The secondary piston 4 in turn divides the lower chamber into a first chamber 6 and a second chamber 7, the torsion spring 3 being disposed within the first chamber 6. Oil is filled in the upper cavity 5, the first cavity 6 and the second cavity 7 all the time, gaps for accommodating the oil to pass through are reserved between the torsion block 2 and the inner wall of the cylinder and between the auxiliary piston 4 and the inner wall of the cylinder respectively, and oil exchange can be carried out among the upper cavity 5, the first cavity 6 and the second cavity 7. In the present embodiment, the piston rod 1, the torsion block 2, the sub-piston 4, and the torsion spring 3 are all coaxially arranged.
In order to realize the switching of the on-off state of the oil passage under different loading states of the piston rod 1, the oil passage comprises a main oil passage arranged in the piston rod 1 and an auxiliary oil passage arranged in the twisting block 2. Referring to fig. 4, the main oil gallery includes a first oil gallery 8, a second oil gallery 9, and a third oil gallery 10; the slave piston 4 includes a fourth oil passage 11, a fifth oil passage 12.
The first oil passage 8 extends along the radial direction of the piston rod 1, and two ends of the first oil passage respectively penetrate through the piston rod 1 so as to be communicated with the upper cavity 5; the second oil duct 9 extends along the radial direction of the piston rod 1, one end of the second oil duct is communicated with the first oil duct 8, and the other end of the second oil duct is communicated with the third oil duct 10; the third oil passage 10 extends in the radial direction of the piston rod 1 and penetrates the piston rod 1, thereby forming two first oil ports 13 communicating with the outside of the piston rod 1. The fourth oil channel 11 extends along the radial direction of the piston rod 1 to form a second oil port 14 communicated with the outside of the torsion block 2; the third oil passage 10 and the fourth oil passage 11 are located at the same level. Because the twisting block 2 is sleeved on the piston rod 1, a sleeved hole is formed in the center of the twisting block 2, and the second oil port 14 is located on the wall of the sleeved hole. The fifth oil passage 12 extends in the axial direction of the piston rod 1, and one end of the fifth oil passage is communicated with the upper cavity 5 while the other end is communicated with the first cavity 6. Two sets of auxiliary oil passages are arranged in total, and the two sets of auxiliary oil passages are symmetrically arranged along the axial direction of the piston rod 1.
In this embodiment, the hole wall of the sleeving hole of the twisting block 2 is in a fitting state with the piston rod 1, when the first oil port 13 and the second oil port 14 are not overlapped, the third oil duct 10 and the fourth oil duct 11 are in a disconnected state, that is, the main oil duct and the auxiliary oil duct are in a disconnected state, when the first oil port 13 and the second oil port 14 are overlapped or partially overlapped, the third oil duct 10 and the fourth oil duct 11 are not in a connected state, that is, the main oil duct and the auxiliary oil duct are in a connected state, and oil exchange can be performed between the upper cavity 5 and the lower cavity through the main oil duct and the auxiliary oil duct.
In this embodiment, each fourth oil passage 11 may be provided with the second oil port 14 only near one end of the piston rod 1, and the other end is closed; however, in order to facilitate the machining of the fourth oil passage 11 in the twist block 2, one of the fourth oil passages 11 may also be set to be in a penetrating state, that is, oil ports are respectively arranged at two ends of the fourth oil passage 11, and a hole is directly drilled along the fourth oil passage 11 during the machining of the twist block 2. At this time, the fourth oil passage 11 exchanges oil only through the gap between the torsion block 2 and the inner wall of the cylinder, and has little influence on the oil exchange inside the damper.
Referring to fig. 5, a first guide groove 17 is formed on the inner wall of the cylinder, and the first guide groove 17 extends along the axial direction of the cylinder. The outer circle of the twisting block 2 is provided with a first guide protrusion 16, the first guide protrusion 16 is movably arranged in a first guide groove 17, and the first guide groove 17 plays a role in guiding. The first guide groove 17 comprises a straight section 25 and a spiral section 26, the straight section 25 is close to the second end of the piston rod 1, and the spiral section 26 is far from the second end of the piston rod 1. When a train passes through the floating slab track bed, the load borne by the floating slab track bed is increased and is transmitted to the piston rod 1, so that the piston rod 1 drives the torsion structure to move downwards, the torsion block 2 rotates under the guiding action of the spiral section 26 when passing through the spiral section 26 of the first guide groove 17, so that the first oil port 13 and the second oil port 14 are overlapped or partially overlapped, the main oil duct and the auxiliary oil duct are communicated, only oil exchange is performed between the upper cavity 5 and the lower cavity through the main oil duct and the auxiliary oil duct, the energy consumption is improved, and when the train passes through the floating slab track bed, the vibration reduction effect of the vibration absorber is better.
After the train leaves the floating slab track bed, the load borne by the piston rod 1 is reduced, the piston assembly moves upwards under the action of the spring assembly, and in the process that the torsion block 2 moves upwards, the piston rod rotates to the original state under the action of the first guide groove 17, so that the main oil duct and the auxiliary oil duct are cut off again, oil exchange cannot be carried out between the upper cavity 5 and the lower cavity through the main oil duct and the auxiliary oil duct, the rigidity of the vibration isolator is improved, and the floating slab track bed is better supported after the train leaves the floating slab track bed.
In the embodiment, the torsion spring 3 is arranged between the torsion block 2 and the secondary piston 4, on one hand, when the piston rod 1 is loaded and the torsion block 2 rotates under the guiding action of the first guide groove 17 in the process of moving downwards, the torsion spring 3 forms a resistance to the rotation, so that the overall rigidity of the shock absorber is increased; by selecting torsion springs 3 with different stiffness, the response degree of the shock absorber to the vibration load can be changed. On the other hand, the torsion spring 3 can provide an assisting force during the return of the torsion block 2.
In this embodiment, a second guide protrusion 18 is further provided on the circumference of the secondary piston 4; a second guide groove 19 is formed in the inner wall of the cylinder, and the axis of the second guide groove 19 is parallel to the axis of the straight section 25 of the first guide groove 17; the second guide protrusion 18 is movably disposed in the second guide groove 19, and the second guide groove 19 guides the sub-piston 4 to move, thereby preventing the sub-piston 4 from rotating. And an auxiliary oil duct 15 is further arranged on the auxiliary piston 4, and the auxiliary oil duct 15 is communicated with the first cavity 6 and the second cavity 7, so that oil exchange between the first cavity 6 and the second cavity 7 is realized.
Specifically, the cylinder comprises a top cover 20, a cylinder body 21 and a bottom cover 22 which are sequentially connected from top to bottom, the top cover 20 is connected with the cylinder body 21 through bolts, and the cylinder body 21 is welded with the bottom cover 22. The through hole for accommodating the first end of the piston rod 1 is formed in the top cover 20, the sealing groove is further formed in the top cover 20, and the sealing assembly for sealing the top cover 20 and the piston rod 1 is filled in the sealing groove. And in the relative movement process of the piston rod 1 and the cylinder, the sealing performance of the shock absorber is ensured.
In order to facilitate the connection and the detachment between the piston rod 1 and the floating slab track bed, the top of the piston rod 1 is connected with a flange 23, and is connected with the floating slab track bed through the flange 23.
In particular, the driving torsion block 2 moves, and the torsion structure further comprises a piston body 27 and a thrust roller bearing 24; the piston body 27 and the piston rod 1 are integrally formed, one end of the thrust roller bearing 24 is abutted against the piston body 27, and the other end of the thrust roller bearing is abutted against the torsion block 2.
Specifically, the spring assembly includes a first spring and a second spring, the first spring is located in the upper cavity 5 and sleeved on the piston rod 1, one end of the first spring abuts against the top cover 20, the first positioning protrusion on the top cover 20 limits the radial movement of the first spring, and the other end of the first spring abuts against the piston body 27. The second spring is located in the second cavity 7, one end of the second spring abuts against the bottom cover 22, the second positioning bulge on the bottom cover 22 limits radial movement of the second spring, and the other end of the second spring abuts against the auxiliary piston 4.
The working process of the shock absorber provided by the embodiment is as follows:
when the vehicle does not pass through the floating slab track bed, the shock absorber is in a normal working state, the first oil port 13 and the second oil port 14 are in an non-overlapped state, and the main oil duct is disconnected with the auxiliary oil duct; the upper cavity 5 and the lower cavity cannot exchange oil through the main oil duct and the auxiliary oil duct; the rigidity of the shock absorber is higher at the moment, and the supporting effect of the floating plate road bed is ensured.
When a vehicle passes through the floating slab track bed, the load borne by the piston rod 1 is increased by the self weight of the vehicle and the load, so that the piston rod moves downwards, the torsion block 2 moves downwards along with the load, and the torsion block 2 overcomes the elasticity of the torsion spring 3 to rotate under the guidance of the spiral section 26 of the first guide groove 17, so that the first oil port 13 and the second oil port 14 are overlapped or partially overlapped, and the main oil channel and the auxiliary oil channel are communicated; oil exchange is carried out between the upper cavity 5 and the lower cavity through the main oil duct and the auxiliary oil duct, so that energy consumption is further increased, and the vibration reduction effect is improved.
After the vehicle leaves the floating slab track bed, the extra load borne by the piston rod 1 disappears, the piston assembly moves upwards under the action of the spring assembly, the torsion block 2 is guided by the spiral section 26 and the straight section 25 of the first guide groove 17 and returns to a normal state, at the moment, the first oil port 13 and the second oil channel 9 are not overlapped, the main oil channel and the auxiliary oil channel are disconnected, the rigidity of the damper is improved, and the supporting effect on the floating slab track bed is still kept.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several equivalent substitutions or obvious modifications can be made without departing from the spirit of the invention, and all the properties or uses are considered to be within the scope of the invention.
Claims (10)
1. A shock absorber for a floating ballast bed comprises a piston assembly and a cylinder; the piston assembly comprises a piston rod, a first end of the piston rod extends into the cylinder, a second end of the piston rod extends out of the cylinder, and the piston rod can move along the axial direction of the cylinder; oil liquid is filled in the cylinder; the method is characterized in that:
the cylinder body is connected with a foundation, and the second end of the piston rod is connected with the floating slab track bed;
the piston assembly comprises a torsion structure and a spring assembly; the torsion structure is connected with the piston rod and moves along with the piston rod, and the cylinder is separated to form an upper cavity and a lower cavity; the spring assembly is respectively connected with the piston assembly and the cylinder body;
the torsion structure is internally provided with a normally-broken oil duct, and the oil duct is communicated after the load borne by the piston rod is increased.
2. A damper for a floating ballast bed according to claim 1 wherein: the torsion structure comprises a torsion block, a torsion spring and an auxiliary piston; the torsion block is rotatably sleeved on the piston rod; one end of the torsion spring is connected with the torsion block, and the other end of the torsion spring is connected with the auxiliary piston; the periphery of the twisting block is provided with a first guide bulge, the inner wall of the cylinder is provided with a first guide groove extending along the axial direction of the cylinder, the first guide bulge is movably arranged in the first guide groove, and the first guide groove guides the twisting block to rotate; the oil passage comprises a main oil passage arranged in the piston rod and an auxiliary oil passage arranged in the torsion block; the head end of the main oil duct is communicated with the upper cavity, and the tail end of the auxiliary oil duct is communicated with the lower cavity; the on-off between the tail end of the main oil duct and the head end of the auxiliary oil duct is determined by the relative position relationship between the torsion block and the piston rod; and when the piston rod is in a normal loaded state, the tail end of the main oil duct is disconnected with the head end of the auxiliary oil duct.
3. A damper for a floating ballast bed according to claim 2 wherein: the main oil passage comprises a first oil passage, a second oil passage and a third oil passage; the first oil duct extends along the radial direction of the piston rod and is communicated with the upper cavity and the second oil duct; the second oil duct extends along the axial direction of the piston rod and is communicated with the third oil duct; the third oil duct extends along the radial direction of the piston rod and comprises a first oil port communicated with the outside of the piston rod;
the auxiliary oil passage comprises a fourth oil passage and a fifth oil passage; the fourth oil duct extends along the radial direction of the piston rod, is communicated with the fifth oil duct and comprises a second oil port communicated with the outside of the twisting block; the fifth oil duct extends along the axial direction of the piston rod and is communicated with the lower cavity;
the third oil duct and the fourth oil duct are positioned at the same horizontal height; when the twisting block rotates to the position that the first oil port is overlapped with the second oil port, the third oil duct is communicated with the fourth oil duct; when the twisting block rotates until the first oil port and the second oil port are not overlapped, the third oil duct and the fourth oil duct are disconnected.
4. A damper for a floating ballast bed according to claim 2 wherein: the first guide groove sequentially comprises a straight line section and a threaded section along the direction gradually far away from the second end of the piston rod.
5. The damper for a floating ballast bed of claim 4, wherein: a second guide bulge is arranged on the circumference of the auxiliary piston; a second guide groove is formed in the inner wall of the cylinder body, and the axis of the second guide groove is parallel to the axis of the straight line section of the first guide groove; the second guide protrusion is movably arranged in the second guide groove.
6. A damper for a floating ballast bed according to claim 2 wherein: the torsion structure further comprises a piston body and a thrust roller bearing; the piston body is fixedly connected with the piston rod, one end of the thrust roller bearing is abutted against the piston body, and the other end of the thrust roller bearing is abutted against the torsion block.
7. The damper for a floating ballast bed of claim 6, wherein: the spring assembly comprises a first spring and a second spring; the first spring is sleeved on the piston rod, one end of the first spring is abutted against the top cover, and the other end of the first spring is abutted against the piston body; the second spring is arranged in the lower cavity, one end of the second spring is abutted against the bottom cover, and the other end of the second spring is abutted against the auxiliary piston.
8. A damper for a floating ballast bed according to any one of claims 1 to 7, wherein: gaps for containing oil to pass through are reserved between each part of the piston assembly and the inner wall of the cylinder body all the time.
9. A damper for a floating ballast bed according to any one of claims 1 to 7, wherein: the cylinder body comprises a top cover, a cylinder body and a bottom cover which are connected in sequence; the top cover is provided with a through hole for the piston rod to pass through.
10. A damper for a floating ballast bed according to claim 9 wherein: the sealing structure is characterized in that a sealing groove is formed in the top cover, and a sealing assembly for sealing the top cover and the piston rod is filled in the sealing groove.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111362807.6A CN113983113B (en) | 2021-11-17 | 2021-11-17 | Shock absorber for floating slab track bed |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111362807.6A CN113983113B (en) | 2021-11-17 | 2021-11-17 | Shock absorber for floating slab track bed |
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| CN113983113B CN113983113B (en) | 2023-02-24 |
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| US5538276A (en) * | 1995-05-23 | 1996-07-23 | Tullis; Jay K. | Tunable air spring |
| CN201461833U (en) * | 2009-06-29 | 2010-05-12 | 董勇 | Rotary seal damper |
| CN104565190A (en) * | 2014-12-29 | 2015-04-29 | 周卫荣 | Buffering brake device |
| CN106090106A (en) * | 2016-08-09 | 2016-11-09 | 河南天减振器科技有限公司 | The new type vibration isolator of connecting rod eccentric wear can be prevented effectively from |
| CN206320222U (en) * | 2016-12-19 | 2017-07-11 | 珠海市皓臻科技有限公司 | Damping buffer with helix oil groove |
| CN110454533A (en) * | 2019-09-05 | 2019-11-15 | 上海备特楼宇科技有限公司 | A kind of high-precision anticollision buffering Self-resetting mechanism and its manufacturing method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5538276A (en) * | 1995-05-23 | 1996-07-23 | Tullis; Jay K. | Tunable air spring |
| CN201461833U (en) * | 2009-06-29 | 2010-05-12 | 董勇 | Rotary seal damper |
| CN104565190A (en) * | 2014-12-29 | 2015-04-29 | 周卫荣 | Buffering brake device |
| CN106090106A (en) * | 2016-08-09 | 2016-11-09 | 河南天减振器科技有限公司 | The new type vibration isolator of connecting rod eccentric wear can be prevented effectively from |
| CN206320222U (en) * | 2016-12-19 | 2017-07-11 | 珠海市皓臻科技有限公司 | Damping buffer with helix oil groove |
| CN110454533A (en) * | 2019-09-05 | 2019-11-15 | 上海备特楼宇科技有限公司 | A kind of high-precision anticollision buffering Self-resetting mechanism and its manufacturing method |
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|---|---|
| CN113983113B (en) | 2023-02-24 |
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