CN1398734A

CN1398734A - Relay overload buffer

Info

Publication number: CN1398734A
Application number: CN 02128735
Authority: CN
Inventors: 向兵
Original assignee: Individual
Current assignee: Individual
Priority date: 2002-08-04
Filing date: 2002-08-04
Publication date: 2003-02-26

Abstract

A relay type overload buffering damper consists of relay blocks, top cover, cylinder, upper piston, lower piston, spring, seal washer, buffer washer and other parts. It is based on the principle of momentum conservation law and kinetic energy conservation law. It can absorb the momentum of wheels for re-buffering, and this makes it possible to reduce the rigidity of elastic element in vehicle suspending bracket and to make riding ever comfortable. The present invention especially suitable for use in car, jeep and other vehicle with independent suspension.

Description

Relay overload buffer

Technical field relay overload buffer of the present invention belongs to automotive suspension.

For automobile, the rigidity of suspension is littler, and then the frequency of natural vibration of automobile is lower, and buffering effect just better.But suspension rate is littler, under certain load vertical deformation just big more, promptly the needed space of wheel bob is just big more.Be subjected to the restriction of factors such as vehicle structure, the amplitude of wheel bob is very limited, and for example: for car, the amplitude of wheel bob is generally less than 40 centimetres, and therefore, the rigidity of suspension can not be too little, and is generally big than desirable rigidity.Relay overload buffer of the present invention can reduce the rigidity of vehicle suspension significantly under the situation that does not increase wheel bob amplitude, thereby reaches more desirable buffering effect.

Design philosophy of the present invention is for automobile, the not corresponding increase in the space of wheel bob if reduce the rigidity of suspension, if automobile runs into greater impact when running at high speed so, when then wheel moves upward to top dead point, still have bigger upwards momentum, at this moment, wheel can produce the moment huge impact to vehicle frame (vehicle body), this moment, huge impact was extremely harmful, can cause the vehicle body strenuous vibration to make the driver like a hen on a hot girdle, even can cause vehicle damage.Be not difficult to know according to the conservation of momentum and kinetic energy conservation law: if two object A and B are arranged, their quality equates, if A moves during beginning, speed is V, and B is static, behind the perfectly elastic collision of they generations to the heart, the A object can all pass to momentum original static B object, setting in motion behind the momentum that the speed vanishing of A object, originally static B object will obtain to transmit, speed is V.Design philosophy of the present invention is based upon on this basis just.The design philosophy of relay overload buffer of the present invention is: wheel is subjected to impacting the back upward movement, in the LAP before it arrives top dead point, mode by collision, give relay block in the relay overload buffer with the some or all of momentum transfer of wheel, the momentum that wheel is made progress reduces or is kept to zero, relay block continues upward movement after then absorbing the momentum of wheel in relay overload buffer, be cushioned gradually.As seen, relay overload buffer can play and increase the same effect in wheel bob space.

The structure diagram (longitudinal diagram) of forming the relay overload buffer of designing according to above-mentioned design philosophy with structure as shown in Figure 1, it mainly is made up of top cover (2), tightening seal washer (1), upper piston (4), cylinder barrel (5), spring (6), relay block (7), lower piston parts such as (9).Between top cover (2) and upper piston (4), air chamber (3) is arranged; Between upper piston (4) and lower piston (9), spring (6) and relay block (7) are arranged, its complementary space is full of damping liquid (generally selecting oil for use) between upper piston (4) and the lower piston (9): through hole (8) is arranged on the relay block (7), and relay block (7) up-and-down movement in cylinder barrel (5) can be subjected to the shock damping action of damping liquid.For making shock damping action reach comparatively ideal effect, can adopt the various prior aries of using in the shock absorber.In general, should guarantee upper piston (4), spring (6), damping liquid, relay block (7), the quality sum of lower piston (9) equals or is slightly less than corresponding nonspring carried mass (annotate: nonspring carried mass comprises wheel and is attached thereto the part or all of quality of parts), and the quality that requires relay block (7) should be several times as much as upper piston (4), spring (6), damping liquid, the quality sum of lower piston (9), be upper piston (4), spring (6), damping liquid, the quality of lower piston (9) quality and with the quality of relay block (7) great disparity (relay block can consider to fill heavy metal materials such as lead for this reason) as far as possible, can reach buffering effect preferably like this.

Working process relay overload buffer of the present invention should be vertically fixed on the vehicle frame (vehicle body), when after wheel is subjected to greater impact, upwards beating near top dead point, will with the lower piston generation bumping collision of relay overload buffer, the momentum of wheel and associated components upward movement (translation) just passes to lower piston, spring, damping liquid, relay block and upper piston.The quality of supposing the collision both sides equates, by the conservation of momentum and kinetic energy conservation law as can be known, whole momentum of wheel and correlated parts will pass to upper piston, spring, damping liquid, lower piston and relay block, wheel will be kept to zero with respect to the make progress speed of translation of vehicle body, wheel will be at the suspension elastic element then, move downward up to contacting under the effect of gravity and shock absorber (vehicle is used always at present) with ground, and lower piston, spring, damping liquid, upper piston and relay block be upward movement after absorbing momentum, air chamber to relay overload buffer compresses, under the pressure effect of air chamber gas, lower piston, spring, damping liquid, upper piston upward speed (referring to the speed with respect to cylinder barrel) is kept to zero very soon, have only relay block in cylinder barrel, to continue upward movement, it is under the elastic force and damping liquid shock damping action and action of gravity of spring, speed upwards is reduced to zero gradually, then at spring force, move downward under the combineds action such as shock damping action of gravity and damping liquid, come back to bottom dead point (drawing close with lower piston), a buffer shock-absorbing process finishes.Repeat said process when running into the impact that makes progress of overload once more.Certainly, if the impact that wheel is subjected to hour, relay overload buffer will can not worked.Here also need clear and definite 2 points: the one, wheel is to take place in short time and displacement to the process that relay overload buffer transmits momentum, therefore, the impulsive force that the relay overload buffer lower piston is subjected to during collision may be very big, but this impact can't be directly passed to vehicle body.The 2nd, after relay-type carries the impact that snubber is subjected to once making progress, relay block meeting upward movement, separate gradually with lower piston, between relay block and lower piston separation period, if be subjected to overload impact again, relay block will reduce wheel momentum absorption ability, but this moment, the air chamber that is positioned at the upper piston top will play the effect of air bellow.

Be lower piston above, spring, damping liquid, the situation that the total mass of relay block and upper piston equates with cooresponding nonspring carried mass (being wheel and the part or all of quality that is attached thereto part), but, lower piston, spring, damping liquid, the total mass of relay block and upper piston also can be less than nonspring carried mass, wheel can only be given overload buffer with the part momentum transfer when at this moment bumping collision took place for both, lower piston, spring, damping liquid, the total mass ratio nonspring carried mass of relay block and upper piston is little must be many more, the momentum that wheel passes is just more little, so, lower piston, spring, damping liquid, the total mass of relay block and upper piston can not be littler too much than nonspring carried mass, otherwise will have influence on buffering effect.The total mass of lower piston, spring, damping liquid, relay block and upper piston is during less than nonspring carried mass, wheel should arrive top dead point in the past in advance a segment distance with momentum transfer to overload buffer.More than analyzing is in the ideal case, will can determine after taking all factors into consideration with different factors such as suspension frame structure according to different vehicle about parameters such as the size of each parts of relay overload buffer, quality in the reality.

The installation of relay overload buffer is for independent suspension structure, wheel generally can be around certain some bob on the vehicle frame, first kind of mounting means of relay overload buffer be as shown in Figure 2: wheel among the figure (3) is around the A bob, and relay overload buffer (2) is installed in the top of the radius of turn r present position that wheel orders to A.If wheel radius of turn position superjacent air space is not enough to install relay overload buffer (2), then can install alternatively, as shown in Figure 3: relay overload buffer (2) is installed near the position the radius of turn, at this moment, the length dimension of relay overload buffer (2) can be bigger, but this mounting means needs a conduit under fluid pressure (6), the principle of utilizing the hydraulic pressure power transmission passes to relay overload buffer (2) with the momentum of wheel, and conduit under fluid pressure (6) must be fixed on vehicle frame or the vehicle body.This mounting means can produce impact moment when wheel (3) is given relay overload buffer (2) with momentum transfer.In addition, relay overload buffer should have dust prevention (not shown in the accompanying drawing 2,3) in installation.

If vehicle has adopted relay overload buffer, the rigidity of the elastic element of its suspension can be reduced to very for a short time so, and the travelling comfort of vehicle is improved greatly.The rigidity of elastic element reduces to bring some new problems significantly, for example; Vehicle is unloaded and at full load vehicle body heave and set is excessive; The Ackermann steer angle vehicle body can tilt etc. significantly, but these problems can solve, and can solve the problem of the unloaded and fully loaded vehicle body fluctuating of vehicle as adopting preloading spring; Excessive inclination takes place when adopting stabilizer antiroll bar or other equipment to avoid Vehicular turn.Because the solution of these problems is not a discussion scope of the present invention, is not described in detail in this.

Relay overload buffer of the present invention is simple in structure, can make ride of vehicle be improved significantly, be particularly suitable for applying adopting on the vehicle of independent suspension structure.

Description of drawings

Accompanying drawing 1 is the structure diagram (longitudinal diagram) of relay overload buffer:

Tightening seal washer (1), top cover (2), air chamber (3), upper piston (4), cylinder barrel (5), spring (6), relay block (7), through hole (8), lower piston (9), buffer gasket (10).

Accompanying drawing 2 is a kind of scheme of installation of relay overload buffer:

Elastic element (1), relay overload buffer (2), wheel (3), vehicle frame (4), bump rubber (5).Wheel is around A point bob, and r is the radius of turn that the relative A of wheel is ordered.

Accompanying drawing 3 is the another kind of scheme of installation of relay overload buffer:

Elastic element (1), relay overload buffer (2), wheel (3), vehicle frame (4), bump rubber (5), hydraulic pipe (6).

Claims

A kind of relay overload buffer, it mainly is made up of parts such as relay block, top cover, cylinder barrel, upper piston, lower piston, spring, tightening seal washer, buffer gaskets, it is characterized in that: a relay block that can absorb the overload momentum of wheel is arranged; One air chamber is arranged between top cover and upper piston, and air chamber can play the effect of air bellow.