CN104455172B - Multistage pressure-limiting adjusting hydraulic buffer - Google Patents
Multistage pressure-limiting adjusting hydraulic buffer Download PDFInfo
- Publication number
- CN104455172B CN104455172B CN201410776550.2A CN201410776550A CN104455172B CN 104455172 B CN104455172 B CN 104455172B CN 201410776550 A CN201410776550 A CN 201410776550A CN 104455172 B CN104455172 B CN 104455172B
- Authority
- CN
- China
- Prior art keywords
- buffer
- buffer gear
- cylinder body
- pressure limiting
- 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.)
- Expired - Fee Related
Links
- 230000007246 mechanism Effects 0.000 claims abstract description 11
- 230000001105 regulatory effect Effects 0.000 claims description 12
- 238000007789 sealing Methods 0.000 claims description 8
- 239000000945 filler Substances 0.000 claims description 4
- 239000003208 petroleum Substances 0.000 claims description 3
- 230000001133 acceleration Effects 0.000 abstract description 9
- 230000003139 buffering effect Effects 0.000 abstract description 9
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 238000013016 damping Methods 0.000 description 17
- 239000012530 fluid Substances 0.000 description 8
- 238000000034 method Methods 0.000 description 5
- 238000007906 compression Methods 0.000 description 3
- 239000002828 fuel tank Substances 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 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
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 230000021715 photosynthesis, light harvesting Effects 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
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 to a kind of Multi-stage pressure limiting regulating hydraulic buffer.
Background technology
Car tracing cauda accident often occurs, and the dolly of fast running knocks into the back the truck travelling at a slow speed, accident
Result often result in the car crash of dolly.Existing vehicle impact buffer can be divided into spring buffer, hydraulic cushion, electricity
The energy-consumption shock-absorption devices such as magnetic buffering.In order that two close cars of high speed steadily release energy, the resistance of needs is not only big, lasting
Time is long, and needs resistance stable, controlled, is not affected by velocity variations.
Viscous damper is widely used in building structure and bridge structure carries out passive energy dissipation, and its damping force is big.Viscous
The structure of damper typically adopts shearing valve type, as shown in figure 1, in figure 101 is cylinder body, 102 is piston, and 103 is viscous fluid,
104 is piston rod, and 105 is throttle orifice.
In a stroke interval t of car crass: w=fs, wherein f are average damping force, s is for damping during car crass
One stroke of device.The size of damping force f with piston movement speed variation relation can approximate representation be: f=cvα, wherein c is resistance
Buddhist nun's device viscosity, relevant with the size of throttle orifice on piston and the ratio of piston cross-section；V is that piston rod is transported with damper cylinder body
Dynamic relative velocity, generally, 0 < α≤1, it is important performance indexes of viscous damper, index α is less, automobile
One stroke internal damping power change of collision is less.
In automobile collision procedure, the relation of damping force and acceleration obeys Newton's second law: f=ma, and wherein, m is
Dolly quality, a is dolly acceleration in collision (it is assumed that big vehicle speed is constant), has research to think, ordinary people can bear
Big instantaneous acceleration is 5g, g=9.8m/s2For acceleration of gravity.During dolly knocks into the back, its acceleration, velocity variable,
Between damper stroke, relation is: 2as=δ v2, wherein, s is a stroke of damper during car crass, and a accelerates for dolly
Degree is it is assumed that during dolly knocks into the back, speed is reduced to 80km/h, δ v=40km/h ≈ 11.1m/s by 120km/h, if setting a=
4g, by formula 2as=δ v2One stroke s=1.5m of damper when can obtain car crass；It follows that s is bigger, add to reducing
Speed is more favourable, but is manufactured process technology by existing machinery and installing space is limited is limited, and damper cylinder body can not be oversize, by
This, 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, protect
Card damping force keeps a constant substantially, and that is, in the whole collision process of rear-end collision, peak acceleration keeps a constant substantially,
This is the key of buffering.For existing viscous damper, close to 1, damping force is approximately directly proportional with speed, and this will lead to touch for it
Hit initial stage acceleration big, later stage power consumption is not enough.Just because of above-mentioned reason, current truck afterbody is fitted without buffer unit,
The baffle plate that it is installed additional cannot be avoided the miserable office of car crash substantially.
Content of the invention
In order to solve above-mentioned technical problem, a kind of present invention structure of offer is simple, reaction is quick, reliable operation, buffering are imitated
Really good Multi-stage pressure limiting regulating hydraulic buffer.
The technical scheme that the present invention solves the above problems is: a kind of Multi-stage pressure limiting regulating hydraulic buffer, including from a left side
The multi-buffer mechanism being sequentially connected to the right side, every grade of buffer gear all includes cylinder body, pressure limiting adjustable type overflow valve and piston, pressure limiting
Adjustable type overflow valve is with being threadedly secured on the left of cylinder body；In adjacent two-stage buffer gear, be located relatively at right side buffer gear its
The left end of cylinder body is socketed with the right-hand member sealing of the buffer gear cylinder body being located relatively at left side, and the cylinder body of right side buffer gear can
With respect to left side buffer gear movement of cylinder block using the piston as left side buffer gear, the pressure limiting of high order end buffer gear is adjusted
Formula overflow valve is connected with fuel tank by petroleum pipeline, and the cylinder body right-hand member of low order end buffer gear is threadeded with bearing plate.
In above-mentioned Multi-stage pressure limiting regulating hydraulic buffer, in adjacent two-stage buffer gear, the buffer gear in left side its
Inboard wall of cylinder block is sequentially provided with seal receptacle, sealing ring, end cap, the inboard wall of cylinder block spiral shell of described end cap and left side buffer gear from left to right
Line connects.
In above-mentioned Multi-stage pressure limiting regulating hydraulic buffer, the cylinder body left end outer wall of described right side buffer gear is provided with leads
Ring, lead ring is threadeded with outer wall of cylinder block, and lead ring is coordinated with the inboard wall of cylinder block gap of left side buffer gear, and lead ring is provided with earial drainage
Hole.
In above-mentioned Multi-stage pressure limiting regulating hydraulic buffer, in described multi-buffer mechanism, each buffer from left to right
The diameter of section of structure cylinder body is sequentially reduced.
In above-mentioned Multi-stage pressure limiting regulating hydraulic buffer, described pressure limiting adjustable type overflow valve includes valve body, valve element, bullet
Spring, adjusting nut and throttle orifice, described valve body is in the semiclosed shape of left side opening, and valve body right side wall has axial throttle orifice, institute
State valve element to be installed in valve body against throttle orifice, in the middle part of valve element, be provided with oil filler point, the right-hand member of described spring is connected with valve element, spring
Left end is connected with adjusting nut, and described adjusting nut is placed in valve body and is connected with valve body screw thread.
The beneficial effects of the present invention is:
1st, multi-buffer is combined formation constant damping power Long travel buffering by the present invention with pressure limiting adjustable type overflow valve
Device, extends cushion stroke and collision time it is ensured that peak acceleration is less than carries out buffering energy-consumption to greatest extent under design load；
2nd, the damping force of present invention buffer gear at different levels is adjustable, damping force stable and uniform during compression, does not substantially become with speed
Change；
3rd, when collision occurs, the rapid adjust automatically of damping force of buffer gears at different levels, reaction is fast, not done by other factorses
Disturb；
4th, the present invention arranges oil filler point in the middle part of valve element, and the use of fitted bolt can be with high-pressure oil gun to buffer gear
Carry out filled fluid and sealing.
Brief description
Fig. 1 is the structural representation of existing viscous damper.
Fig. 2 is the structural representation of the present invention.
Fig. 3 is the structure chart of pressure limiting adjustable type overflow valve in Fig. 2.
Fig. 4 is the sectional structure chart of valve element in Fig. 3.
Specific embodiment
The present invention is further illustrated with reference to the accompanying drawings and examples.
As shown in Fig. 2 the present invention includes the level Four buffer gear being sequentially connected from left to right, front three-level buffer gear every
First-level buffer mechanism includes cylinder body, pressure limiting adjustable type overflow valve 3, seal receptacle 8, sealing ring 9 and end cap 10, the wherein second buffer
Structure, third level buffer gear also include lead ring 6；Fourth stage buffer gear includes the 4th cylinder body 15, plug screw, screw rod, bearing plate 16
With lead ring 6.
The diameter of section of each buffer gear cylinder body is sequentially reduced from left to right, and the 4th cylinder body 15 left end is with plug screw 14 screw thread even
Connect, the 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 gap coordinates, and lead ring 6 is provided with discharge orifice 7, by the 4th cylinder body 15 left end and the sealing socket of the 3rd cylinder body 12 right-hand member,
Then from right-hand member, seal receptacle 8, sealing ring 9, end cap 10 are pressed into from the 3rd cylinder body 12 right-hand member successively, end cap 10 and the 3rd cylinder body 12
Inner thread connects, and the 4th cylinder body 15 can move with respect to the 3rd cylinder body 12 using the piston as the 3rd cylinder body 12.With identical
Method is sequentially connected the second cylinder body 11 and the first cylinder body 4, and last 4th cylinder body 15 right-hand member is threadeded with bearing plate 16, and first delays
The pressure limiting adjustable type overflow valve 3 of punch mechanism is connected with fuel tank 1 by petroleum pipeline 2.
As shown in figure 3, described pressure limiting adjustable type overflow valve 3 includes valve body 21, valve element 22, spring 20, adjusting nut 19 and
Throttle orifice 18, described valve body 21 is in the semiclosed shape of left side opening, and valve body 21 right side wall has axial throttle orifice 18, described valve element
22 are installed in valve body 21 against throttle orifice 18, as shown in figure 4, being provided with oil filler point 17 in the middle part of valve element 22, the right side of described spring 20
End is connected with valve element 22, and spring 20 left end is connected with adjusting nut 19, and described adjusting nut 19 is placed in valve body 21 and and valve body
21 is threaded.
Because the throttle orifice 18 of pressure limiting adjustable type overflow valve 3 is big, damping force is mainly put to death in spring 20 precompression.In buffering
Device by compression process, if the pressure difference of first, second and third grade of buffer gear both sides is respectively as follows: δ p1、δp2、δp3, respectively
Level buffer cylinder body outside diameter is as shown in Fig. 2 design damping force is f.Using etc. wallop method pre-pressure of the spring, concrete grammar
As follows:
According to design requirement, can first determine that cylinder size at different levels；Substitution formula (a) (b) (c), can obtain δ p successively1、δ
p2、δp3Design load；By rotating adjusting nut 19 compression spring 20 it is convenient to obtain the pressure reduction at different levels of needs.To formula (a)
B () (c) is adjusted it is ensured that buffer is at different levels is compressed successively in order.
The operation principle of the present invention is as follows: when bearing plate 16 is hit, in the 3rd cylinder body 12 fluid pressure increase, when its with
When in second cylinder body 11, pressure difference exceedes limit value, the spring 20 of the pressure limiting adjustable type overflow valve 3 of third level buffer gear is pressed
Contracting, fluid flows through the gap between valve element 22 and valve body 21 from the 3rd cylinder body 12 and enters the second cylinder body 11；Fluid in second cylinder body 11
Pressure increases, when it exceedes limit value with pressure difference in the first cylinder body 4, the pressure limiting adjustable type overflow valve of second level buffer gear
3 spring 20 is compressed, and fluid flows through the gap between valve element 22 and valve body 21 from the second cylinder body 11 and enters the first cylinder body 4；First
In cylinder body 4, fluid pressure increases, when it exceedes limit value with atmospheric pressure pressure difference, the pressure limiting adjustable type of second level buffer gear
The spring 20 of overflow valve 3 is compressed, and fluid flows through the gap between valve element 22 and valve body 21 from the first cylinder body 4 and enters fuel tank 1.Pass through
Prototype test obtains every one-level damping force curve α ≈ 0.13 of pressure limiting adjustment type buffer, and damping force hysteresis loop is approximately square
Shape.
Claims (4)
1. a kind of Multi-stage pressure limiting regulating hydraulic buffer it is characterised in that: include the multi-buffer that is sequentially connected from left to right
Mechanism, every grade of buffer gear all includes cylinder body, pressure limiting adjustable type overflow valve and piston, and pressure limiting adjustable type overflow valve is with being screwed
On the left of cylinder body；In adjacent two-stage buffer gear, be located relatively at right side the left end of its cylinder body of buffer gear be located relatively at a left side
The right-hand member sealing socket of the buffer gear cylinder body of side, and the cylinder body of right side buffer gear can be with respect to the cylinder of left side buffer gear
Body motion passes through petroleum pipeline and oil using the piston as left side buffer gear, the pressure limiting adjustable type overflow valve of high order end buffer gear
Case be connected, the cylinder body right-hand member of low order end buffer gear is threadeded with bearing plate, described pressure limiting adjustable type overflow valve include valve body,
Valve element, spring, adjusting nut and throttle orifice, described valve body is in the semiclosed shape of left side opening, and valve body right side wall has axial section
Discharge orifice, described valve element is installed in valve body against throttle orifice, is provided with oil filler point in the middle part of valve element, and the right-hand member of described spring is with valve element even
Connect, spring left end is connected with adjusting nut, described adjusting nut is placed in valve body and is connected with valve body screw thread.
2. Multi-stage pressure limiting regulating hydraulic buffer as claimed in claim 1 it is characterised in that: adjacent two-stage buffer gear
In, its inboard wall of cylinder block of the buffer gear in left side is sequentially provided with seal receptacle, sealing ring, end cap, described end cap and left side from left to right
The inboard wall of cylinder block of buffer gear is threaded.
3. Multi-stage pressure limiting regulating hydraulic buffer as claimed in claim 2 it is characterised in that: adjacent two-stage buffer gear
In, the cylinder body left end outer wall of right side buffer gear is provided with lead ring, and lead ring is threadeded with outer wall of cylinder block, and lead ring is buffered with left side
The inboard wall of cylinder block gap cooperation of mechanism, lead ring is provided with discharge orifice.
4. Multi-stage pressure limiting regulating hydraulic buffer as claimed in claim 2 it is characterised in that: described multi-buffer mechanism
In, the diameter of section of each buffer cylinder body is sequentially reduced from left to right.
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 CN104455172A (en) | 2015-03-25 |
| CN104455172B true CN104455172B (en) | 2017-01-18 |
Family
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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) |
Families Citing this family (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 |
| 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 |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2922358C2 (en) * | 1979-06-01 | 1985-10-10 | Hans Dipl.-Kfm. 2000 Hamburg Berghöfer | Bumper devices for motor vehicles |
| US8967346B2 (en) * | 2009-10-30 | 2015-03-03 | Great Lakes Sound & Vibration, Inc. | Multi-stage telescopic shock absorber |
| CN105065537A (en) * | 2013-06-25 | 2015-11-18 | 蒋盘君 | Processor-module-controlled multi-stage buffer |
| 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 |
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2014
- 2014-12-15 CN CN201410776550.2A patent/CN104455172B/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN104455172A (en) | 2015-03-25 |
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Granted publication date: 20170118 |