CN201810716U

CN201810716U - Vehicle absorber

Info

Publication number: CN201810716U
Application number: CN 201020537472
Authority: CN
Inventors: 王金龙; 朱亮
Original assignee: Weifang University
Current assignee: Weifang University
Priority date: 2010-09-15
Filing date: 2010-09-15
Publication date: 2011-04-27
Anticipated expiration: 2020-09-15

Abstract

The utility model discloses a vehicle absorber, which belongs to the technical field of auto parts, and comprises an air bag, a connecting piece and a piston cylinder which are sleeved in an absorber shell body and are sequentially connected together, wherein the hermetic cavity of the air bag forms an air bag chamber, one hermetic cavity is arranged in the connecting piece to form a constant pressure chamber, and a first spring is clamped and pressed between the piston of the piston cylinder and one end of the piston cylinder, which is far away from a piston chamber; and a damping hole, a pressure relief device and a first compensating valve are arranged between the air bag chamber and the constant pressure chamber, and a pressure limit valve and a second compensating valve are arranged between the constant pressure chamber and the piston chamber. The utility model overcomes the defect of oil leakage of a hydraulic absorber, has the advantages of good vibration reduction effect, good sensitivity and long service life, improves the vehicle running smoothness, and improves the comfortability of drivers.

Description

Shock absorber for vehicle

Technical field

The utility model relates to the auto parts machinery technical field, relates in particular to a kind of shock absorber for vehicle.

Background technique

Vibration when vibration damper is mainly used to suppress bounce-back after the spring absorbing and from the impact on road surface.Through uneven road surface the time, though vibration absorbing spring can be filtered the vibration on road surface, spring self also has to-and-fro motion, and vibration damper is exactly to be used for suppressing the device that this spring jumps.Vibration damper is too soft, and vehicle body will jump up and down, and vibration damper will bring too big resistance too firmly, hinders the spring proper functioning.In retrofit process about suspension system, hard vibration damper will be arranged in pairs or groups mutually with hard spring, and the hardness of spring is closely bound up with car weight, therefore the harder vibration damper of the general employing of heavier car, with draw the device that the bent axle that shakes joins, be used for the contending with torsional vibration of bent axle, i.e. the impact force of bent axle subject cylinder igniting and the phenomenon that twists.

At present common vibration damper mainly contains the vibration damper of dydraulic shock absorber, gas-filled shock absorber and adaptive damping from this angular divisions of material that produces damping.Wherein, extensively adopt hydraulic shock absorber in the automobile suspension system, its principle is, when vehicle frame and vehicle bridge are done reciprocal relative movement and are moved back and forth in the cylinder barrel of piston at vibration damper, fluid in the shock absorber casing just flows into another inner chamber from inner chamber by some narrow holes repeatedly, at this moment, the interior friction of the friction of liquid and inwall and fluid molecule just forms the damping force to vibration; Gas-filled shock absorber is a kind of new type vibration isolator that has grown up since the sixties, its structural feature is that a floating piston is housed in the bottom of cylinder barrel, in a sealed gas chamber of floating piston and the formation of cylinder barrel one end, be filled with high pressure nitrogen, the O RunddichtringO of big section is housed on floating piston, its gentlely separates oil fully, the compression valve and the rebound valve that change channel cross-sectional area with its movement velocity size are housed on the working piston, when the wheel bob, the working piston of vibration damper moves reciprocatingly in fluid, make that to produce oil pressure between the epicoele of working piston and the cavity of resorption poor, pressure oil is just pushed compression valve and rebound valve open and is flowed back and forth, because valve produces bigger damping force to pressure oil, makes vibration attenuation; The suspension that the automobile of resistance adjustable vibration damper is housed generally uses the pneumatic spring of variable rigidity as elastic element, its principle is, pneumatic spring is if air pressure raises, then the pressure in the vibration damper air chamber also raises, owing to the change of pressure changes the throttle diameter of fluid, thereby reach the purpose that changes damping rigidity.

The tradition vibration damper is because the restriction of its structure and damping medium, and its damper stiffness is big, can not moment cut the vibration that is produced, and therefore can cause in various degree damage to auto parts and components, and the while also directly has influence on occupant's comfort level.Mainly there is following defective in common vibration damper: anti-idle running device and automatic controller structure, sensitivity is not good, amplitude big, " abnormal sound ", " hardening ", easy oil leakage and working life are short.

The model utility content

Technical problem to be solved in the utility model is: a kind of shock absorber for vehicle is provided, overcome the defective of dydraulic shock absorber leakage of oil, and have that good damping result, sensitivity are good, the advantage of long service life, to improve vehicle running smoothness, improve driver and passenger's comfort level.

For solving the problems of the technologies described above, the technical solution of the utility model is: shock absorber for vehicle, comprise and be set in air bag, link and the piston cylinder that is linked in sequence in the shock absorber casing together, closed cavity in the described air bag forms gasbag chamber, be provided with a closed cavity in the described link and form the constant voltage chamber, be clamped with first spring between the piston of described piston cylinder and described piston cylinder the end away from piston chamber; Be provided with the pressure relief device of damping hole, unidirectional unlatching and first recuperation valve of unidirectional unlatching between described gasbag chamber and the constant voltage chamber, be provided with the pressure-limit valve of unidirectional unlatching and second recuperation valve of unidirectional unlatching between described constant voltage chamber and the described piston chamber.

As a kind of improvement, described piston cylinder is provided with the extraneous outlet valve of a connection away from an end of described piston chamber.

As further improvement, described shock absorber for vehicle comprises that also one is used to be communicated with gas charging valve extraneous and piston chamber, and described gas charging valve is installed on the cylinder body of described piston cylinder.

Improve as another kind, described pressure relief device comprises spool, and described spool is slidingly mounted in the passage, and described passage is arranged between described gasbag chamber and the constant voltage chamber, is clamped with second spring between described spool and the link; Described spool is provided with axial blind hole, and described blind hole is communicated with gasbag chamber, and the axial of described spool is provided with some radial direction through hole, and described radial direction through hole is communicated with the outer surface of described blind hole and spool.

After having adopted technique scheme, the beneficial effects of the utility model are: owing to changed traditional is the design method of the vibration damper of medium with hydraulic oil, having adopted pure air is the vibration damper medium, it is simple in structure, there is not the leakage of oil problem, good seal has prolonged working life of vibration damper greatly; Because vibration damper has three working rooms, be respectively: gasbag chamber, constant voltage chamber, piston chamber, just by the common effect of having finished three grades of vibration dampings of vibration damper that cooperates in this three Room, do not respond when having overcome traditional vibration damper slight vibration, the defective of vibration damping rapidly again during high vibration, have the obvious and highly sensitive advantage of effectiveness in vibration suppression, improved driver and passenger's comfort level.

Because piston cylinder is provided with the extraneous outlet valve of a connection away from an end of described piston chamber, when piston chamber's pressure was big, piston can in time move down compression first spring, and the gas between piston and the piston cylinder can be able to timely discharge, can not produce back pressure, to keep the optimum performance of vibration damper.

Because being equipped with, the cylinder body of piston cylinder is communicated with gas charging valve extraneous and piston chamber, make when the interior gas of vibration damper has leakage, can in time be replenished, be unlikely to because gas medium is few, and influence the proper functioning of vibration damper, stopped the generation of problems such as the vibration damping that causes because of gas leakage is dumb effectively.

Because spool is on the spring action lower slider is installed on passage between gasbag chamber and the constant voltage chamber, spool is provided with the axial blind hole of communicated air bags chamber, axial blind hole axially on be provided with the radial direction through hole that is communicated with axial blind hole and valve core outer surface again, when the gasbag chamber internal pressure is excessive, spool moves down, compress second spring, pressurized gas in the air bag just the radial direction through hole by spool to enter into constant voltage indoor, and the pressure size in the size of radial direction through hole air displacement and the gasbag chamber is complementary, pressurized gas in the gasbag chamber in time are drained in the constant voltage chamber, make that the response of vibration damper is sensitive more, further improved vehicle running smoothness.

Description of drawings

Below in conjunction with drawings and Examples the utility model is further specified.

Accompanying drawing is the utility model embodiment's a structural representation;

Among the figure: 1, shock absorber casing, 2, air bag, 21, gasbag chamber, 3, link, 31, the constant voltage chamber, 4, piston cylinder, 41, piston chamber, 5, piston, 6, first spring, 7, first recuperation valve, 8, damping hole, 9, pressure relief device, 91, spool, 92, second spring, 10, pressure-limit valve, 11, second recuperation valve, 12, outlet valve, 13, gas charging valve.

Embodiment

As shown in drawings, a kind of shock absorber for vehicle, comprise and be set in air bag 2, link 3 and the piston cylinder 4 that is linked in sequence in the shock absorber casing 1 together, closed cavity in the described air bag 2 forms gasbag chamber 21, be provided with a closed cavity in the described link 3 and form constant voltage chamber 31, be clamped with first spring 6 between the piston 5 of described piston cylinder 4 and piston cylinder 4 the end away from piston chamber 41; Be provided with the pressure relief device 9 of damping hole 8, unidirectional unlatching and first recuperation valve 7 of unidirectional unlatching between described gasbag chamber 21 and the constant voltage chamber 31, be provided with the pressure-limit valve 10 of unidirectional unlatching and second recuperation valve 11 of unidirectional unlatching between described constant voltage chamber 31 and the described piston chamber 41; Described piston cylinder 4 is provided with the extraneous outlet valve 12 of a connection away from an end of described piston chamber 41; Described shock absorber for vehicle comprises that also one is used to be communicated with gas charging valve 13 extraneous and piston chamber 41, and described gas charging valve 13 is installed on the cylinder body of described piston cylinder 4.

Described pressure relief device 9 comprises spool 91, and described spool 91 is slidingly mounted in the passage, and described passage is arranged between described gasbag chamber 21 and the constant voltage chamber 31, is clamped with second spring 92 between described spool 91 and the link 3; Described spool 91 is provided with axial blind hole, and described blind hole is communicated with gasbag chamber 21, and the axial of described spool 91 is provided with some radial direction through hole, and described radial direction through hole is communicated with the outer surface of described blind hole and spool 91.

Its working principle is as follows:

Vibration damper has three working rooms, can play the effect of three grades of vibration dampings.First is a gasbag chamber 21, be filled with pure air in the air bag 2, internal pressure is about 3-5MPa, if the little vibration that only produces during automobile running can be directly thus pressurized gas absorb, if produce by a relatively large margin and during vibration that frequency is higher, will produce the gas of high pressure in the vibration damper, this high pressure compressed gas can be passed through damping hole 8, according to the force analysis of fluid, this damping hole 8 can produce the effect of buffering to pressurized gas, and this promptly plays the effect of first order vibration damping.When the automobile vibration amplitude is excessive, air bag 2 internal pressures increase, to reach certain value right when pressure, spool 91 compressions second spring 92 of the pressure relief device 9 between constant voltage chamber 31 and the gasbag chamber 21, spool 91 moves down, air pressure in the gasbag chamber 21 is big more, the displacement that spool 91 moves down is also big more, the radial direction through hole quantity that is communicated with constant voltage chamber 31 is also many more, the air displacement of spool 91 is also big more, gas can enter constant voltage chamber 31 rapidly the radial direction through hole on damping hole 8 and spool 91 simultaneously, this moment, constant voltage chamber 31 interior gas pressures increased rapidly, because constant voltage chamber 31 is that room pressure is identical with gasbag chamber 21 in steady state, the increase of room pressure at this moment will produce the effect of resistance to the gas that enters, slow down vibrating effect, this has promptly played partial effectiveness in vibration suppression.When the automobile violent oscillatory motion, time of vibration prolongs, constant voltage chamber 31 internal air pressures increase, can push the pressure-limit valve 10 between piston chamber 41 and the constant voltage chamber 31 when pressure arrives certain value open, pressurized gas will enter in the piston chamber 41, and piston 5 will reach a stability with the top pressurized gas under first spring 6 supports, change along with piston chamber's 41 pressure, first spring 6 will shrink accordingly, and this moment, first spring 6 also absorbed a part of vibration, and this has promptly played the effect of third level vibration damping.

When vehicle body is up, gas pressure diminishes in the gasbag chamber 21, pressurized gas in the constant voltage chamber 31 just enter into gasbag chamber 21 by the damping hole 8 and first recuperation valve 7, along with the gas pressure in the constant voltage chamber 31 diminishes, piston 5 moves under the effect of first spring 6, gas in the piston chamber 41 finally reaches balance by the gas pressure that second recuperation valve 11 enters in 31, three working rooms, constant voltage chamber.When the gas in the vibration damper had leakage, gas charging valve 13 can in time replenish, and had stopped the generation of problems such as the vibration damping that causes because of gas leakage is dumb effectively, had guaranteed the proper functioning of vibration damper.

The utility model is not limited to above-mentioned concrete mode of execution, and those of ordinary skill in the art is from above-mentioned design, and without performing creative labour, all conversion of having done all drop within the protection domain of the present utility model.

Claims

1. shock absorber for vehicle, it is characterized in that: comprise being set in air bag, link and the piston cylinder that is linked in sequence in the shock absorber casing together, closed cavity in the described air bag forms gasbag chamber, be provided with a closed cavity in the described link and form the constant voltage chamber, be clamped with first spring between the piston of described piston cylinder and described piston cylinder the end away from piston chamber; Be provided with the pressure relief device of damping hole, unidirectional unlatching and first recuperation valve of unidirectional unlatching between described gasbag chamber and the constant voltage chamber, be provided with the pressure-limit valve of unidirectional unlatching and second recuperation valve of unidirectional unlatching between described constant voltage chamber and the described piston chamber.

2. shock absorber for vehicle as claimed in claim 1 is characterized in that: described piston cylinder is provided with the extraneous outlet valve of a connection away from an end of described piston chamber.

3. shock absorber for vehicle as claimed in claim 2 is characterized in that: described shock absorber for vehicle comprises that also one is used to be communicated with gas charging valve extraneous and piston chamber, and described gas charging valve is installed on the cylinder body of described piston cylinder.

4. as described any shock absorber for vehicle of claim 1 to 3, it is characterized in that: described pressure relief device comprises spool, described spool is slidingly mounted in the passage, and described passage is arranged between described gasbag chamber and the constant voltage chamber, is clamped with second spring between described spool and the link; Described spool is provided with axial blind hole, and described blind hole is communicated with gasbag chamber, and the axial of described spool is provided with some radial direction through hole, and described radial direction through hole is communicated with the outer surface of described blind hole and spool.