CN104455172A - Multistage pressure-limiting adjusting hydraulic buffer - Google Patents
Multistage pressure-limiting adjusting hydraulic buffer Download PDFInfo
- Publication number
- CN104455172A CN104455172A CN201410776550.2A CN201410776550A CN104455172A CN 104455172 A CN104455172 A CN 104455172A CN 201410776550 A CN201410776550 A CN 201410776550A CN 104455172 A CN104455172 A CN 104455172A
- Authority
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- China
- Prior art keywords
- damping mechanism
- pressure limiting
- cylinder body
- buffer
- cylinder block
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000000872 buffer Substances 0.000 title claims abstract description 35
- 230000007246 mechanism Effects 0.000 claims abstract description 52
- 238000013016 damping Methods 0.000 claims description 61
- 230000001105 regulatory effect Effects 0.000 claims description 30
- 238000007789 sealing Methods 0.000 claims description 5
- 239000002828 fuel tank Substances 0.000 claims description 4
- 230000001133 acceleration Effects 0.000 abstract description 10
- 230000003139 buffering effect Effects 0.000 abstract description 5
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 239000012530 fluid Substances 0.000 description 8
- 238000000034 method Methods 0.000 description 7
- 238000013461 design Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000006173 Good's buffer Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000000418 atomic force spectrum Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000021715 photosynthesis, light harvesting Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 210000000538 tail Anatomy 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- 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
- F16F9/22—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 one or more cylinders each having a single working space closed by a piston or plunger
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Fluid-Damping Devices (AREA)
Abstract
The invention discloses a multistage pressure-limiting adjusting hydraulic buffer comprising a plurality of buffer mechanisms connected in order from left to right. Each buffer mechanism comprises a cylinder block, a pressure-limiting adjusting overflow valve and a piston; the pressure-limiting adjusting overflow valve is fixed to the left of the cylinder block in a threaded manner. In every two adjacent buffer mechanisms, the left end of the cylinder block of the right one is hermetically connected to the right end of the cylinder block of the left one in a sleeving manner, the cylinder block of the right one can move relative to the cylinder block of the left one so as to serve as a piston for the left one; the pressure-limiting adjusting overflow valve of the leftmost one of the buffer mechanisms is connected with an oil tank through an oil pipe; the right end of the cylinder block of the rightmost one is connected with a bearing plate in a threaded manner. The multistage buffering and the pressure-limiting adjusting overflow valves are combined to form a constant-damping-force long-stroke buffer; buffering stroke and collision time are prolonged; power consumption for buffering is maximally reduced at the premise that maximum acceleration is lower than a designed value.
Description
Technical field
The present invention relates to a kind of hydraulic bjuffer, particularly a kind of Multi-stage pressure limiting regulating hydraulic buffer.
Background technique
Car tracing cauda accident often occurs, and the dolly of fast running knocks into the back the truck travelled at a slow speed, and the result of accident often causes the car crash of dolly.Existing vehicle impact buffer can be divided into the energy-consumption shock-absorption devices such as spring buffer, hydraulic cushion, electromagnetic buffer.In order to two cars making high speed close steadily release energy, the resistance of needs is not only wanted greatly, the endurance is long, and needs resistance stable, controlled, not by the impact of velocity variations.
Viscous damper is widely used in building structure and bridge structure carries out passive energy dissipation, and its damping force is large.The structure of viscous damper generally adopts shearing valve type, and as shown in Figure 1, in figure, 101 is cylinder body, and 102 is piston, and 103 is viscous fluids, and 104 is piston rod, and 105 is throttle orifice.
In a stroke interval T of car crash: W=Fs, wherein F is average damping force, a stroke of damper when s is car crash.The size of damping force F with piston movement speed variation relation can approximate representation be: F=cv
α, wherein c is damper coefficient of viscosity, relevant with the ratio that size and the piston cross-section of throttle orifice on piston amass; V is the relative velocity of piston rod and damper movement of cylinder block, and generally, 0< α≤1, be an important performance indexes of viscous damper, index α is less, and a stroke internal damping power change of car crash is less.
In automobile collision procedure, the relation of damping force and acceleration obeys Newton's second law: F=ma, wherein, m is dolly quality, a is dolly acceleration (assuming that large vehicle speed is constant) in collision, have research to think, the maximum instantaneous acceleration that ordinary people can bear is 5g, g=9.8m/s
2for gravity accleration.Knock into the back in process at dolly, between its acceleration, velocity variable, damper stroke, pass is: 2as=Δ v
2, wherein, a stroke of damper when s is car crash, a is dolly acceleration, assuming that dolly knocks into the back in process, speed reduces to 80km/h by 120km/h, Δ v=40km/h ≈ 11.1m/s, if setting a=4g, by formula 2as=Δ v
2a stroke s=1.5m of damper during car crash can be obtained; It can thus be appreciated that s is larger, more favourable to reduction acceleration, but manufacture processing technique and the limited restriction of installing space by existing machinery, damper cylinder body can not be oversize, and thus, multi-stage buffer has become best selection.How to reduce the index α value of every one-level internal damping power, and between not at the same level, ensure that damping force keeps a constant substantially, namely in the whole collision process of rear-end collision, maximum acceleration keeps a constant substantially, this is the key of buffering.For existing viscous damper, it is close to 1, and damping force is approximated to direct ratio with speed, and this will cause collision initial stage acceleration large, and later stage power consumption is not enough.Just because of above-mentioned reason, current truck afterbody does not install damping device, and its baffle plate installed additional can not avoid the miserable office of car crash substantially.
Summary of the invention
In order to solve the problems of the technologies described above, the invention provides that a kind of structure is simple, reaction fast, the Multi-stage pressure limiting regulating hydraulic buffer of reliable operation, good buffer effect.
The technological scheme that the present invention solves the problem is: a kind of Multi-stage pressure limiting regulating hydraulic buffer, comprise the multi-buffer mechanism connected successively from left to right, every grade of damping mechanism includes cylinder body, pressure limiting regulating type relief valve and piston, and pressure limiting regulating type relief valve screw thread is fixed on the left of cylinder body; In adjacent two-stage damping mechanism, the left end being relatively positioned at its cylinder body of damping mechanism on right side seals with the relative right-hand member being positioned at the damping mechanism cylinder body in left side and is socketed, and the cylinder body of right side damping mechanism can relative to the movement of cylinder block of left side damping mechanism using the piston as left side damping mechanism, the pressure limiting regulating type relief valve of high order end damping mechanism is connected with fuel tank by transport pipe, and the cylinder body right-hand member of low order end damping mechanism is threaded with bearing plate.
In above-mentioned Multi-stage pressure limiting regulating hydraulic buffer, in adjacent two-stage damping mechanism, its inboard wall of cylinder block of the damping mechanism in left side is provided with sealing seat, seal ring, end cap from left to right successively, and described end cap is threaded with the inboard wall of cylinder block of left side damping mechanism.
In above-mentioned Multi-stage pressure limiting regulating hydraulic buffer, the cylinder body left end outer wall of described right side damping mechanism is provided with lead ring, and lead ring is threaded with outer wall of cylinder block, and the inboard wall of cylinder block Spielpassung of lead ring and left side damping mechanism, lead ring is provided with discharge orifice.
In above-mentioned Multi-stage pressure limiting regulating hydraulic buffer, in described multi-buffer mechanism, the diameter of section of each damping mechanism cylinder body reduces successively from left to right.
In above-mentioned Multi-stage pressure limiting regulating hydraulic buffer, described pressure limiting regulating type relief valve comprises valve body, spool, spring, adjusting nut and throttle orifice, described valve body is left side open semi closed shape, valve body right side wall has axial throttle orifice, described spool is installed in valve body near throttle orifice, is provided with oil hole in the middle part of spool, and the right-hand member of described spring is connected with spool, spring left end is connected with adjusting nut, and described adjusting nut to be placed in valve body and to be connected with valve body screw thread.
Beneficial effect of the present invention is:
1, multi-buffer combines with pressure limiting regulating type relief valve and forms constant damping power Long travel buffer by the present invention, extends cushion stroke and time of collision, ensures that maximum acceleration carries out buffering energy-consumption to greatest extent under being less than design load;
2, the damping force of the present invention's damping mechanism at different levels is adjustable, and damping force stable and uniform during compression, substantially not with velocity variations;
3, when collision occurs, the damping force of damping mechanism at different levels adjusts rapidly automatically, and reaction is fast, does not disturb by other factors;
4, the present invention arranges oil hole in the middle part of spool, the use of fitted bolt, can carry out filled fluid and sealing with high-pressure oil gun to damping mechanism.
Accompanying drawing explanation
Fig. 1 is the structural representation of existing viscous damper.
Fig. 2 is structural representation of the present invention.
Fig. 3 is the structural drawing of pressure limiting regulating type relief valve in Fig. 2.
Fig. 4 is the sectional structure chart of spool in Fig. 3.
Embodiment
Below in conjunction with drawings and Examples, the present invention is further illustrated.
As shown in Figure 2, the present invention includes the level Four damping mechanism connected successively from left to right, every one-level damping mechanism of first three grade of damping mechanism comprises cylinder body, pressure limiting regulating type relief valve 3, sealing seat 8, seal ring 9 and end cap 10, and wherein the second damping mechanism, third level damping mechanism also comprise lead ring 6; Fourth stage damping mechanism comprises the 4th cylinder body 15, plug screw, screw rod, bearing plate 16 and lead ring 6.
The diameter of section of each damping mechanism cylinder body reduces successively from left to right, 4th cylinder body 15 left end is threaded with plug screw 14, 4th cylinder body 15 left end outer wall is provided with lead ring 6, lead ring 6 is connected with the 4th cylinder body 15 outer wall thread, lead ring 6 and the 3rd cylinder body 12 inwall Spielpassung, lead ring 6 is provided with discharge orifice 7, 4th cylinder body 15 left end and the 3rd cylinder body 12 right-hand member are sealed and is socketed, then from right-hand member by sealing seat 8, seal ring 9, end cap 10 is successively from the 3rd cylinder body 12 right-hand member press-in, end cap 10 is connected with the 3rd cylinder body 12 inner thread, 4th cylinder body 15 can move relative to the 3rd cylinder body 12 using the piston as the 3rd cylinder body 12.Connect the second cylinder body 11 and the first cylinder body 4 in the same way successively, last 4th cylinder body 15 right-hand member is threaded with bearing plate 16, and the pressure limiting regulating type relief valve 3 of the first damping mechanism is connected with fuel tank 1 by transport pipe 2.
As shown in Figure 3, described pressure limiting regulating type relief valve 3 comprises valve body 21, spool 22, spring 20, adjusting nut 19 and throttle orifice 18, described valve body 21 is in left side open semi closed shape, valve body 21 right side wall has axial throttle orifice 18, described spool 22 is installed in valve body 21 near throttle orifice 18, as shown in Figure 4, oil hole 17 is provided with in the middle part of spool 22, the right-hand member of described spring 20 is connected with spool 22, spring 20 left end is connected with adjusting nut 19, and described adjusting nut 19 to be placed in valve body 21 and to be threaded with valve body 21.
Because the throttle orifice 18 of pressure limiting regulating type relief valve 3 is large, damping force is mainly put to death in spring 20 precompression.At buffer by compression process, if the pressure difference of first, second and third grade of damping mechanism both sides is respectively: Δ P
1, Δ P
2, Δ P
3, as shown in Figure 2, design damping force is F to buffer cylinder body outside diameter at different levels.Employing waits wallop method pre-pressure of the spring, and concrete grammar is as follows:
According to designing requirement, can first determine cylinder size at different levels; Substitution formula (a) (b) (c), can obtain Δ P successively
1, Δ P
2, Δ P
3design load; By rotating adjusting nut 19 Compress Spring 20, the pressure reduction at different levels needed can be obtained easily.Formula (a) (b) (c) is adjusted, can ensure that buffer is at different levels and be compressed successively in order.
Working principle of the present invention is as follows: when bearing plate 16 is hit, 3rd cylinder body 12 inner fluid pressure increases, when in itself and the second cylinder body 11, pressure difference exceedes limit value, the spring 20 of the pressure limiting regulating type relief valve 3 of third level damping mechanism is compressed, and fluid enters the second cylinder body 11 from the 3rd cylinder body 12 gap flow through between spool 22 and valve body 21; Second cylinder body 11 inner fluid pressure increases, when in itself and the first cylinder body 4, pressure difference exceedes limit value, the spring 20 of the pressure limiting regulating type relief valve 3 of second level damping mechanism is compressed, and fluid enters the first cylinder body 4 from the second cylinder body 11 gap flow through between spool 22 and valve body 21; First cylinder body 4 inner fluid pressure increase, when it and barometric pressure pressure difference exceedes limit value time, the spring 20 of the pressure limiting regulating type relief valve 3 of second level damping mechanism is compressed, and fluid enters fuel tank 1 from the first cylinder body 4 gap flow through between spool 22 and valve body 21.Obtained every one-level damping force curve α ≈ 0.13 of pressure limiting adjustment type buffer by prototype test, damping force hysteresis loop is approximately rectangle.
Claims (5)
1. a Multi-stage pressure limiting regulating hydraulic buffer, it is characterized in that: comprise the multi-buffer mechanism connected successively from left to right, every grade of damping mechanism includes cylinder body, pressure limiting regulating type relief valve and piston, and pressure limiting regulating type relief valve screw thread is fixed on the left of cylinder body; In adjacent two-stage damping mechanism, the left end being relatively positioned at its cylinder body of damping mechanism on right side seals with the relative right-hand member being positioned at the damping mechanism cylinder body in left side and is socketed, and the cylinder body of right side damping mechanism can relative to the movement of cylinder block of left side damping mechanism using the piston as left side damping mechanism, the pressure limiting regulating type relief valve of high order end damping mechanism is connected with fuel tank by transport pipe, and the cylinder body right-hand member of low order end damping mechanism is threaded with bearing plate.
2. Multi-stage pressure limiting regulating hydraulic buffer as claimed in claim 1, it is characterized in that: in adjacent two-stage damping mechanism, its inboard wall of cylinder block of damping mechanism in left side is provided with sealing seat, seal ring, end cap from left to right successively, and described end cap is threaded with the inboard wall of cylinder block of left side damping mechanism.
3. Multi-stage pressure limiting regulating hydraulic buffer as claimed in claim 2, it is characterized in that: the cylinder body left end outer wall of described right side damping mechanism is provided with lead ring, lead ring is threaded with outer wall of cylinder block, and the inboard wall of cylinder block Spielpassung of lead ring and left side damping mechanism, lead ring is provided with discharge orifice.
4. Multi-stage pressure limiting regulating hydraulic buffer as claimed in claim 2, it is characterized in that: in described multi-buffer mechanism, the diameter of section of each buffer cylinder body reduces successively from left to right.
5. Multi-stage pressure limiting regulating hydraulic buffer as claimed in claim 1, it is characterized in that: described pressure limiting regulating type relief valve comprises valve body, spool, spring, adjusting nut and throttle orifice, described valve body is left side open semi closed shape, valve body right side wall has axial throttle orifice, described spool is installed in valve body near throttle orifice, oil hole is provided with in the middle part of spool, the right-hand member of described spring is connected with spool, spring left end is connected with adjusting nut, and described adjusting nut to be placed in valve body and to be connected with valve body screw thread.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410776550.2A CN104455172B (en) | 2014-12-15 | 2014-12-15 | Multistage pressure-limiting adjusting hydraulic buffer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410776550.2A CN104455172B (en) | 2014-12-15 | 2014-12-15 | Multistage pressure-limiting adjusting hydraulic buffer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104455172A true CN104455172A (en) | 2015-03-25 |
| CN104455172B CN104455172B (en) | 2017-01-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410776550.2A Expired - Fee Related CN104455172B (en) | 2014-12-15 | 2014-12-15 | Multistage pressure-limiting adjusting hydraulic buffer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104455172B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106677964A (en) * | 2016-11-21 | 2017-05-17 | 杭州衡源汽车科技有限公司 | Multi-stage energy storage pressure-limiting circulation drive turbine power generation device provided with vibration isolating pad |
| CN111536185A (en) * | 2020-05-14 | 2020-08-14 | 镇江市亚凤气动元件有限公司 | Controllable gas spring opened at tail part |
| CN117382876A (en) * | 2023-10-24 | 2024-01-12 | 湖南山河华宇航空科技有限公司 | Landing gear shimmy damper and aircraft |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2922358A1 (en) * | 1979-06-01 | 1980-12-04 | Hans Dipl Kfm Berghoefer | Telescopic bumper bar shock absorber - has increasing size annular pistons acting as cylinders for next smaller pistons |
| US20110101579A1 (en) * | 2009-10-30 | 2011-05-05 | Great Lakes Sound & Vibration, Inc. | Multi-Stage Telescopic Shock Absorber |
| CN103291804A (en) * | 2013-06-25 | 2013-09-11 | 苏州唐氏机械制造有限公司 | Multi-stage buffer capable of automatically regulating buffering stage number |
| CN203585190U (en) * | 2013-12-17 | 2014-05-07 | 湖南科技大学 | Multistage pressure-limiting regulating hydraulic buffer |
| CN203868219U (en) * | 2014-04-08 | 2014-10-08 | 长沙市健通精密机械制造有限公司 | Hydro-pneumatic spring with multiple levels of compressible piston rods |
| CN204327840U (en) * | 2014-12-15 | 2015-05-13 | 湖南科技大学 | A kind of Multi-stage pressure limiting regulating hydraulic buffer |
-
2014
- 2014-12-15 CN CN201410776550.2A patent/CN104455172B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2922358A1 (en) * | 1979-06-01 | 1980-12-04 | Hans Dipl Kfm Berghoefer | Telescopic bumper bar shock absorber - has increasing size annular pistons acting as cylinders for next smaller pistons |
| US20110101579A1 (en) * | 2009-10-30 | 2011-05-05 | Great Lakes Sound & Vibration, Inc. | Multi-Stage Telescopic Shock Absorber |
| CN103291804A (en) * | 2013-06-25 | 2013-09-11 | 苏州唐氏机械制造有限公司 | Multi-stage buffer capable of automatically regulating buffering stage number |
| CN203585190U (en) * | 2013-12-17 | 2014-05-07 | 湖南科技大学 | Multistage pressure-limiting regulating hydraulic buffer |
| CN203868219U (en) * | 2014-04-08 | 2014-10-08 | 长沙市健通精密机械制造有限公司 | Hydro-pneumatic spring with multiple levels of compressible piston rods |
| CN204327840U (en) * | 2014-12-15 | 2015-05-13 | 湖南科技大学 | A kind of Multi-stage pressure limiting regulating hydraulic buffer |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106677964A (en) * | 2016-11-21 | 2017-05-17 | 杭州衡源汽车科技有限公司 | Multi-stage energy storage pressure-limiting circulation drive turbine power generation device provided with vibration isolating pad |
| CN111536185A (en) * | 2020-05-14 | 2020-08-14 | 镇江市亚凤气动元件有限公司 | Controllable gas spring opened at tail part |
| CN111536185B (en) * | 2020-05-14 | 2021-02-05 | 镇江市亚凤气动元件有限公司 | Controllable gas spring opened at tail part |
| CN117382876A (en) * | 2023-10-24 | 2024-01-12 | 湖南山河华宇航空科技有限公司 | Landing gear shimmy damper and aircraft |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104455172B (en) | 2017-01-18 |
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Granted publication date: 20170118 |