CN101210598B - Damping device and hydraulic power-assist steering system using the same - Google Patents
Damping device and hydraulic power-assist steering system using the same Download PDFInfo
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- CN101210598B CN101210598B CN2006101726177A CN200610172617A CN101210598B CN 101210598 B CN101210598 B CN 101210598B CN 2006101726177 A CN2006101726177 A CN 2006101726177A CN 200610172617 A CN200610172617 A CN 200610172617A CN 101210598 B CN101210598 B CN 101210598B
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Abstract
The invention provides a shock-absorbing device and a hydraulic turning system using the shock-absorbing device. The shock-absorbing device comprises a valve body, a mandrel and an elastic film. The hydraulic turning system comprises a power element, an executive element and a control element, wherein the hydraulic turning system further comprises the shock-absorbing device provided in the invention. Based on the damping of the elastic film to the hydraulic oil, the shock-absorbing device has good shock attenuation function with small size, facilitating the set-up. The hydraulic turning system is provided with the shock-absorbing device and the shock-absorbing device has efficient damping on the hydraulic oil, so that the hydraulic turning system incorporates the shock attenuation function to overcome the problem that the prior hydraulic turning system has no shock attenuation function.
Description
Technical field
The hydraulic power-assist steering system that the present invention relates to a kind of damping device and use this damping device.
Background technique
Damping device has a wide range of applications in various vehicles, in automobile.Damping device act as damped part, reduce through the vibrations of this damping device or the adverse effect of impact, thereby machinery be among the preferable working state.At present, what generally adopt is hydraulic damping device, and this device carries out damping by the hydraulic oil to the hydraulic damping device of flowing through, thereby plays the effect of damping, reduction impact.The application area of hydraulic damping device is very extensive, as automobile, hydraulic press etc.
In order to improve the operation portability of steering vehicle when turning, to reduce driver's labor intensity, hydraulic power-assist steering system is widely used on vehicle.As shown in Figure 1, traditional hydraulic power-assist steering system comprises: dynamical element, executive component, control unit, and wherein, dynamical element is generally steerig pump 1, steering oil tank 2 and steering oil pipe 3, being respectively applied for to hydraulic power-assist steering system pressure hydraulic oil is provided, is the power source of whole system; Executive component is the ram (not shown) that is positioned at commutator inside, and the steering piston (not shown) is installed in this ram, and this steering piston is rigidly connected in drag link 6; Control unit is the switching valve (not shown) that is positioned at commutator 4 inside, and this valve is controlled the ram action according to the rotation of commutator input shaft 7, moves thereby drive drag link 6 by steering piston.
The groundwork process of traditional hydraulic power-assist steering system is as follows: at first the driver controls the steering wheel rotation, this rotation is passed to commutator 4 step by step then, on the one hand, commutator 4 is converted to the translation of drag link 6 by mechanical transmission with this rotation, drives steering gear then and makes wheel steering; On the other hand, when the input shaft 7 of commutator 4 rotates, can drive the ram action that is arranged in commutator 4, produce hydraulic coupling, on the direction identical, drive drag link and move, thereby realize the power-assisted effect with drag link 6 translation directions.Whole hydraulic system can adopt machinery control or electronic control, all is applied to the present technique field maturely.
Yet in the vehicle driving process, the road surface can constantly produce impulsive load and produce vibrations wheel, if the excesssive gap of steer drive is easy to produce the shake of front-wheel pendulum, the operability of vehicle is reduced greatly; And the vibrations meeting that produces is delivered to whole vehicle body by drag link, can also be delivered to steering wheel by steering system, suitable vibrations can allow the driver obtain road feel preferably, if but shake excessive then " hired roughneck " phenomenon can occur, and if the vibrations of whole vehicle body excessive then passenger's comfort level is reduced greatly.
Therefore, as shown in Figure 1, in vehicle, generally be provided with steering damper apparatus 5, the vibrations of steering system are used to decay, this steering damper apparatus 5 is the core structure of inner full of liquid, utilizes the vibrations that decay of the interior fricative viscous damping of fluid molecule, and volume is bigger, the limited workplace in the space is difficult to be provided with this damping device.One end of steering damper apparatus 5 is connected in steering system, and the other end is connected in vehicle body, because of steering damper apparatus 5 layout that is the level of state, so to its seal request strictness.
Yet,, relatively more difficult when damping device 5 is set because the space of vehicle is very limited, design for vehicle has bigger restriction, if but damping device 5 is removed, because hydraulic power-assist steering system does not have shock-absorbing function, then can not effectively solve vibration problems.
Summary of the invention
The objective of the invention is to be difficult to be provided with in order to overcome existing damping device, and hydraulic power-assist steering system does not have the defective of shock-absorbing function, and a kind of damping device of being convenient to be provided with is provided, also provide a kind of and use this shock-absorbing function and have the hydraulic power-assist steering system of shock-absorbing function.
The invention provides a kind of damping device, wherein, described damping device comprises valve body, mandrel and elastic membrane, described valve body comprises the oilhole that axially runs through valve body along valve body, described valve body also comprises the center hole that axially runs through valve body along valve body, described mandrel runs through this center hole and fixedlys connected with valve body, and described elastic membrane is installed on the described mandrel and contacts with two end faces of described valve body respectively, thereby part covers described oilhole.
The present invention also provides a kind of hydraulic power-assist steering system, and this system comprises: dynamical element, executive component and control unit, and described dynamical element comprises oil pump and oil pipe; Described executive component comprises oil hydraulic cylinder; Described control unit comprises control valve, and described oil pump is connected by described oil pipe with control valve, and described control valve is connected by described oil pipe with oil hydraulic cylinder, and wherein, described hydraulic power-assist steering system also has above-mentioned damping device provided by the invention.
According to damping device provided by the invention, this damping device has elastic membrane, and this elastic membrane partly covers the oilhole that runs through valve body.In this damping device, the damping of hydraulic oil is realized the shock-absorbing function of this damping device by elastic membrane, rather than utilize friction between the hydraulic oil molecule, like this, the effect of damping can be improved on the one hand, on the other hand, the volume of damping device can be reduced widely, because realize in traditional damping device of shock-absorbing function must having abundant hydraulic oil and could produce enough big frictional force by the friction between the hydraulic oil molecule.Like this, this damping device can be provided with easily.
According to hydraulic power-assist steering system provided by the invention, when vehicle is subjected to impulsive load in the process of moving and produces when vibrations, the drag link of wheel steering system can cause flowing of the interior hydraulic oil of this hydraulic power-assist steering system, because in this hydraulic power-assist steering system, be provided with damping device, this damping device passes through the effective damping to hydraulic oil, thereby greatly reduces the vibrations that are delivered to steering wheel (even vehicle body).Like this and since this hydraulic power-assist steering system integrated shock-absorbing function, thereby overcome the defective that does not have integrated shock-absorbing function in the existing hydraulic power-assist steering system.
Description of drawings
Fig. 1 is the schematic representation of existing hydraulic power-assist steering system;
Fig. 2 is the schematic representation of hydraulic power-assist steering system provided by the invention;
Fig. 3 is the working principle schematic representation of hydraulic power-assist steering system among Fig. 2;
Fig. 4 is the decomposing schematic representation of damping device provided by the invention;
Fig. 5 is the structural representation of damping device among Fig. 3;
Fig. 6 is the structural representation of the valve body of damping device among Fig. 4 and Fig. 5;
Fig. 7 is the sectional view along Fig. 6 middle section line B-B;
Fig. 8 is the schematic representation that hides the valve body end face of flexible film among Fig. 6, is higher than oil hole at the enterprising oil hole of this end face;
Fig. 9 is the schematic representation of the end face of the valve body of the flexible film of covering among Fig. 6, goes out oil hole and be higher than the oil-feed through hole on this end face.
Embodiment
Below with reference to accompanying drawing the present invention is described in detail.
As Fig. 4-shown in Figure 7, described damping device comprises valve body 20, mandrel 21 and elastic membrane 22, described valve body 20 comprises the oilhole that axially runs through valve body 20 along valve body 20, described valve body 20 also comprises the center hole that axially runs through valve body 20 30 along valve body 20, described mandrel 21 runs through this center hole 30 and fixedlys connected with valve body 20, described elastic membrane 22 is installed on the described mandrel 21 and contacts with two end faces of described valve body 20 respectively, thereby part covers described oilhole.
Described valve body 20 can be cylindrical body, cuboid or square body, for ease of making, is preferably cylindrical body.The size of valve body 20 can be selected according to concrete application.The material of valve body 20 has no particular limits, and can be metallic material or nonmetallic material.
The oilhole of valve body 20 is used to satisfy the circulation of hydraulic oil, and center hole 30 is used to connect mandrel 21, so that with the assembling of this damping device 15.Described oilhole can be for one or more, and preferably, the quantity of this oilhole is a plurality of, and a plurality of oilhole is symmetrically distributed in the end face of cylindrical body 20.
Mandrel 21 passes center hole 30, and the two is transition fit or interference fit, is connected with the tight of valve body 20 in order to realize mandrel, is preferably interference fit.The length of mandrel 21 can be determined according to concrete applied field is incompatible.The material of mandrel 21 has no particular limits, and can be metallic material or nonmetallic material.
Oilhole on valve body 20, mandrel 21 and the valve body 20 can wholely form, and also can form respectively, and then assemble, and determines according to concrete material, size and processing conditions.Whole formation can be made by molding, for well known to those of ordinary skill in the art, no longer is described in detail at this.
Described elastic membrane 22 is installed on the mandrel 21, is positioned at the both sides of valve body 20, thereby contacts with two end faces of described valve body 20, partly to cover described oilhole.Owing on two end faces of valve body 20, all be coated with elastic membrane 22, thus no matter hydraulic oil when which end face of valve body 20 enters valve body 20, the damping that all can receive elastic membrane 22.
The oilhole of the damping device 15 among the present invention partly hides, and part is open-minded.Can be according to the incompatible adjusting of carrying out flexible sheet 22 of the applied field of damping device 15, preferably, the area that oilhole is opened part is 1/2-1 with the scope of the ratio of the area of oilhole enclosure portion.
According to above-mentioned damping device 15, when hydraulic oil flow during through this damping device 15, if at first arrive the end face that valve body 20 contacts with elastic membrane 22, because elastic membrane 20 parts cover oilhole, the reserve part oilhole is open-minded simultaneously, thereby the part that high-pressure and hydraulic oil is opened by oilhole enters in the oilhole of damping device 15.Elastic membrane 22 is under the effect of oil pressure and be pressed on the end face of valve body 20.Because oilhole under the covering of elastic membrane 22, can not make the smooth and easy outflow of hydraulic oil, thereby the damping function of playing.
Under the situation of all flexible film 22 on two end faces of damping device 15, when having improved damping device 15 dampings, also limited flow by the hydraulic oil of damping device 15.For when guaranteeing that damping device 15 has enough dampings, guaranteeing has enough flows that passes through damping device 15, preferably, as Fig. 4, Fig. 6 and shown in Figure 7, described oilhole comprises oil-feed through hole 32 and goes out oil hole 31, on an end face of described valve body 20, described oil-feed through hole 32 is higher than the described oil hole 31 that goes out; On the other end of described valve body 20, described oil-feed through hole 32 is lower than the described oil hole 31 that goes out.
Specifically, on an end face of valve body 20, the part at oil-feed through hole 32 places is made boss, thereby make oil-feed through hole 32 be higher than oil hole 31; On another end face of valve body 20, the part that will go out oil hole 31 places is made boss, is higher than oil-feed through hole 32 thereby use oil hole 31.
Thereby, as shown in Figure 8, be higher than on the end face of the described described valve body 20 that goes out oil hole 31 described elastic membrane 22 cover part oil-feed through holes 32 at oil-feed through hole 32; As shown in Figure 9, be lower than at oil-feed through hole 32 on the end face of the described described valve body 20 that goes out oil hole 31, described elastic membrane 22 cover parts go out oil hole 31.
When hydraulic oil at first arrives oil-feed through hole 32 and is higher than the end face of the described described valve body 20 that goes out oil hole 31, on this end face, the oil-feed through hole 32 of elastic membrane 22 cover parts and to go out oil hole 31 open-minded fully.The part that hydraulic oil is opened by oil-feed through hole 32 and go out oil hole 31 and flow into damping device 15, under the effect of oil pressure, elastic membrane 22 is pressed on this end face.On the other end, go out oil hole 31 and be higher than oil-feed through hole 32, the going out oil hole 31 of elastic membrane 22 cover parts and oil-feed through hole 32 is open-minded fully.Hydraulic oil flows out damping device 15 from the part of opening that goes out oil hole 31 and oil-feed through hole 32.Under the impact of hydraulic oil, elastic strain takes place in elastic membrane 22, thus the hydraulic oil that opposing is flowed.
When hydraulic oil at first arrived out oil hole 31 and is higher than the end face of valve body 20 of oil-feed through hole 32, the situation of flowing through of hydraulic oil was similar to the above, is not described in detail at this.
On two end faces of valve body 20, all be coated with elastic membrane 22, and enterprising oil holes 32 of two end faces and going out under the oil hole 31 rugged situations, can guarantee the amount of flow that enough hydraulic oil is enough by being uneven of the two on the one hand, on the other hand, make that the damping scope of damping device 15 is bigger, damping is better.
Oil-feed through hole 32 or go out oil hole 31 can be for one or more, be preferably a plurality of, as 3 or 4, so that this damping device 15 has bigger flow.Described a plurality of oil-feed through hole 32 and a plurality ofly go out oil hole 31 to be preferably symmetry spaced apart on the end face of valve body 20 is so that manufacturing makes the fluid stream that flows through damping device 15 evenly distribute simultaneously.
Under the preferable case, because when vibrations took place, hydraulic oil was reverse flow, promptly hydraulic oil enters this damping device 15 from going out oil hole 31, and flows out from oil-feed through hole 32.Vibrations are bigger to the influence of system during this oil return, thereby preferably, the section area of described oil-feed through hole 32 is greater than the described section area that goes out oil hole 31.And the area of the part that described oil-feed through hole 32 is not hidden by elastic membrane 22 is greater than the described area that goes out the part that oil hole 31 do not hide by elastic membrane 22.Damping effect is more obvious in the time of like this, just can guaranteeing oil return.
Under the preferable case, damping device 15 of the present invention also has controlling device, in order to the damping size of adjusting elastic membrane 22, thereby make this damping device 15 have bigger damping scope, thereby this damping device 15 also has bigger application area.Below controlling device is described in detail.
As shown in Figure 4 and Figure 5, described controlling device comprises back-up ring 23 and snap ring 27, this back-up ring 23 is connected in mandrel 21, described snap ring 11 is fixedly connected on the mandrel 21, described elastic membrane 22 is between described valve body 20 and back-up ring 23, described back-up ring 23 is between described elastic membrane 22 and snap ring 27, and described elastic membrane 22 closely contacts with back-up ring 23.
Back-up ring 23 contacts with elastic membrane 22, is used to limit the elastic strain of elastic membrane 22.Described snap ring 27 is fixed on the mandrel 21, can be by regulating the exposure level between elastic membrane 22 and the back-up ring 23.If elastic membrane 22 is comparatively tight with contacting of back-up ring 23, then the damping capacity of elastic membrane 22 is also bigger; If elastic membrane is comparatively loose with contacting of back-up ring 23, then the damping capacity of elastic membrane 22 is also less.
Any resiliently deformable can not take place in the part that elastic membrane 22 is pushed down by back-up ring 23, thereby, can control the deformation degree of elastic membrane 22 by the diameter of regulating back-up ring 23.
Under the preferable case, when considering oil return fluid vibrations to the influence of system during than oil-feed the influence of fluid vibrations big, near the diameter of the back-up ring 23 of the elastic membrane 22 that hides part oil-feed through hole 32 diameter less than the back-up ring 23 of another elastic membrane 22 of telling oil hole 31 near shielding part.
The damping that the damping that is run into when like this, hydraulic oil enters oil hydraulic cylinder 8 is run into during by fuel-displaced outflow oil hydraulic cylinder 8 less than hydraulic oil.Thereby the vibrations during oil return are subjected to decaying greatly.
Back-up ring 23 is preferably disc, with corresponding with the shape of valve body 20.
As shown in Figure 4 and Figure 5, described controlling device also comprises spacing cutting ferrule 24, elastic element 25 and block 26, described spacing cutting ferrule 24, with block 26 be connected in described mandrel 21, described elastic element 25 is provided with around described spacing cutting ferrule 24, and this elastic element 25 described spacing cutting ferrule 24, and block 26 between, described spacing cutting ferrule 24, elastic element 25 and block 26 have the gap between described spacing cutting ferrule 24 and the described block 26 between described back-up ring 23 and snap ring 27.
Described spacing cutting ferrule 24 has the length (axial component) along mandrel 21 axially-extendings, also has the length (radial component) along mandrel 21 extend radiallies, and spacing cutting ferrule 24 has center hole, to be movably connected on mandrel 21.
On the external peripheral surface of spacing cutting ferrule 24,, also be connected with block 26 on the mandrel 21 around having elastic component 25.One end of elastic element 25 acts on the radial component of spacing cutting ferrule 24, and the other end acts on the block 26.
As shown in Figure 5, described spacing cutting ferrule 24, elastic element 25 and block 26 are between described back-up ring 23 and snap ring 27, and the diameter of back-up ring 23 is much smaller than the diameter of the radial component of spacing cutting ferrule 24.
Flowing out in the situation of this damping device 15 with high-pressure and hydraulic oil is example, and the effect of these spacing cutting ferrule 24 elastic elements 25 and block 26 is illustrated.
When high-pressure and hydraulic oil flowed out in this damping device 15, elastic membrane 22 began to take place elastic strain, was center and warpage makes elastic membrane 22 contact more closely with back-up ring 23 with self center region.When pressure continued to increase, elastic membrane 23 meetings contacted with the end face of the radial component of spacing cutting ferrule 24, thereby make elastic element 25 further compress.
Owing in this damping device 15, increased elastic element 25, thereby after even if the elastic strain of elastic membrane 22 reaches capacity, this damping device 15 can also further provide damping by this elastic element 25.And, after pressure increases to elastic membrane 23 and degree that the end face of the radial component of spacing cutting ferrule 24 contacts, elastic strain no longer takes place in elastic membrane 23, thereby, the elastic strain of elastic membrane 22 can be controlled in the suitable scope, thereby can prolong the working life of elastic membrane 22, also prolong the working life of this damping device 15.
According to damping device 15 provided by the invention, because this damping device 15 produces the shock-absorbing function that damping function realizes this damping device 15 by using the flow through hydraulic oil of damping device 15 of 22 pairs of elastic membranes, rather than realizes shock-absorbing function by the frictional force between the hydraulic oil molecule.Thereby, greatly reduced volume, thereby be convenient under the installing space condition of limited, this damping device 15 is installed.
As shown in Figures 2 and 3, the present invention also provides a kind of hydraulic power-assist steering system, and this system comprises dynamical element (not shown), executive component and control unit, and described dynamical element comprises oil pump and oil pipe; Described executive component comprises oil hydraulic cylinder 8; Described control unit comprises control valve 9, described oil pump and control valve 9 are connected by oil pipe, and described control valve 9 is connected with oil hydraulic cylinder 8 by oil pipe, wherein, described hydraulic power-assist steering system also has damping device 15, and this damping device 15 is an above-mentioned damping device 15 provided by the invention.
As shown in Figure 3, control valve 9 as control unit is communicated with oil hydraulic cylinder 8 by oil pipe, has steering piston 14 in the oil hydraulic cylinder 8, steering piston 14 is divided into a left side with oil hydraulic cylinder 8, right two parts, steering piston 14 is rigidly connected with drag link 6, control valve 9 has filler opening 10, oil outlet 11, right lateral hydraulic fluid port 12 and left lateral hydraulic fluid port 13, wherein, filler opening 10 is connected by oil pipe with dynamical element (as oil pump), oil outlet 12 is connected with the oil tank (not shown) of stores hydraulic pressure oil, thereby hydraulic oil is injected oil tank, high-pressure and hydraulic oil enters in the control valve 9 by filler opening 10, and control valve 9 is according to the action of input shaft 7 and the high-pressure and hydraulic oil content is assigned to all the other each oil outlets.
The working principle of control valve 9 is as follows: when vehicle is in the craspedodrome state, input shaft 7 is failure to actuate, high-pressure and hydraulic oil directly is dispensed to oil outlet 11 via control valve 9, can not enter right lateral hydraulic fluid port 12 or left lateral hydraulic fluid port 13, and this moment, oil hydraulic cylinder 8 interior steering pistons 14 can not move yet; When vehicle is in the right lateral state, input shaft 7 clockwise rotates (driver's observation), then the high-pressure and hydraulic oil that enters control valve 9 by filler opening 10 is dispensed to right lateral hydraulic fluid port 12 via this control valve 9, and enter the right side of oil hydraulic cylinder 8 by oil pipe, thereby promote steering piston 14 to left movement, like this, the hydraulic oil in oil hydraulic cylinder 8 left sides just enters left lateral hydraulic fluid port 13 by oil pipe, flows into oil tank by oil outlet 11 again; When vehicle is in the left lateral state, input shaft 7 rotates counterclockwise (driver's observation), then the high-pressure and hydraulic oil that enters control valve 9 by filler opening 10 is dispensed to left lateral hydraulic fluid port 13 via this control valve 9, and enter the left side of oil hydraulic cylinder 8 by oil pipe, thereby promoting steering piston 14 moves right, like this, the hydraulic oil on oil hydraulic cylinder 8 right sides just enters right lateral hydraulic fluid port 12 by oil pipe, flows into oil tank by oil outlet 11 again.In the time of steering piston 14 motion, because steering piston 14 is rigidly connected with drag link 6 or as one, thereby the effect that auxiliary drag link 6 moves is played in the motion of steering piston 14.
As shown in Figure 3, in hydraulic power-assist steering system of the present invention, damping device 15 is installed also in hydraulic circuit, this damping device 15 can be installed in any position of hydraulic circuit, gets final product can play the circulation of damping force hydraulic oil.
The shock transfer that produces when ground is during to the drag link of wheel steering system, drag link 6 can be subjected to these vibrations and double swerve, thereby, the steering piston 14 that drag link drives in swing process in the oil hydraulic cylinder 8 rocks, owing in oil circuit, be provided with damping device 15, this installs the mobile generation effective damping for hydraulic oil, thereby plays the effect of damping.
As shown in Figure 3, in order to improve damping device 15 self rigidity, preferably, damping device 15 is installed on the place, hydraulic oil gateway of oil hydraulic cylinder 8.Because damping device 15 is fixedlyed connected with oil hydraulic cylinder 8, thereby more can bring into play the damping effect of self effectively.Have steering piston 14 in the oil hydraulic cylinder 8, this steering piston 14 is divided into two-part with oil hydraulic cylinder 8, and described damping device 15 is installed in 8 two parts of described oil hydraulic cylinder place, hydraulic oil gateway separately respectively.Thereby when hydraulic oil entered one of them part of oil hydraulic cylinder 8 by damping device 15, the hydraulic oil in another part can flow out this part by another damping device 15, and vice versa.
Because damping device 15 is installed on the place, hydraulic oil gateway of oil hydraulic cylinder 8, thereby the hydraulic oil in the hydraulic power-assist steering system must just can pass in and out this oil hydraulic cylinder 8 by this damping device 15.
When hydraulic power-assist steering system was in normal working state, the impact that is passed to drag link 6 and vibrations were all in suitable scope.When hydraulic oil flow during through damping device 15, the elastic strain of elastic membrane 22 also is in the normal scope.At this moment, the effect played of damping device 15 is to allow flowing through of the hydraulic power-assist steering system performance needed enough flow hydraulic oil of assist function.
Because in damping device 15 provided by the invention, elastic membrane 22 hides the oilhole of part, the retaining part oilhole is open-minded simultaneously, permission hydraulic oil passes through, thereby when the hydraulic power-assist steering system normal working, damping device 15 of the present invention can satisfy this system fully and bring into play power-steering effect.
When percussion produced vibrations in wheel, this impact at first acted on drag link, and then by drag link and cooperating of input shaft being delivered to steering wheel.If can not be effectively the vibrations of drag link be controlled in the suitable scope, then driver's road feel is relatively poor, and the vibrations that produce also can be directly delivered to whole vehicle body.
When shock effect during in drag link 6, drag link 6 can take place to rock sharp under the effect of these vibrations, with bigger instantaneous acceleration left and right sides translation.Like this, the steering piston 14 in the shattering zone hydrodynamic cylinder pressure 8 of drag link 6 is synchronized with the movement, thereby makes the pressure acute variation of hydraulic oil in the oil hydraulic cylinder 8.Specifically, a part of pressure in the oil hydraulic cylinder 8 sharply descends, thereby hydraulic oil need be sucked in this part; Another part pressure in the oil hydraulic cylinder 8 sharply rises, and forces the interior hydraulic oil flow of this part for outside this part.
According to above-mentioned damping device 15, when the part of oil hydraulic cylinder 8 sucks high-pressure and hydraulic oil, this high-pressure and hydraulic oil enters this part by this damping device 15, because oilhole partly is coated with elastic membrane 22, elastic membrane 22 can stop high-pressure and hydraulic oil to pour in the oilhole with instantaneous velocity faster like this, played damping function, slowed down high-pressure and hydraulic oil impulse force, elastic membrane 22 is under the effect of oil pressure and be pressed on the end face of valve body 20 simultaneously; When another part of oil hydraulic cylinder 8 is discharged high-pressure and hydraulic oil, this high-pressure and hydraulic oil is discharged in this part by damping device 15, because oilhole partly is coated with elastic membrane 22, be subjected to the damping function of this elastic membrane 22 equally, thereby slowed down the impulse force of high-pressure and hydraulic oil, simultaneously elastic membrane 22 produces bigger elastic strain under the percussion of oil pressure, because elastic membrane 22 located by described controlling device, thereby can regulate the damping size of elastic membrane 22 by the position of controlling elastic membrane 22.
If on two end faces of valve body 20, it is different with the height of oil-feed through hole 32 to go out oil hole 31.In this case, in the time of the hydraulic power-assist steering system proper functioning, when hydraulic oil enters oil hydraulic cylinder 8 a part of by this damping device 15, at first arrive the end face that oil-feed through hole 32 is higher than the valve body 20 of oil hole 31, the part that elastic membrane 22 cover part oil-feed through holes 32, hydraulic oil are opened by oil-feed through hole 32 and go out oil hole 31 and flow into damping devices 15.Compare with said circumstances, increased the flow of oil-feed greatly.When hydraulic oil flows out another part in oil hydraulic cylinder 8 by damping device 15, elastic membrane 22 cover parts go out oil hole 31, and on the oil-feed through hole 32 without any covering, also increased fuel-displaced flow greatly.Thereby, to compare with said circumstances, this damping device 15 can more effectively play the power-assisted effect.
When these damping device 15 performance cushioning effects, severe impact and shock effect are promptly arranged when drag link 6, because impact endurance test shock sharply rises a part of pressure of oil hydraulic cylinder 8, force the hydraulic oil in this part to be discharged in this part by damping device 15; And simultaneously another part pressure sharply descends, and the hydraulic oil of oil hydraulic cylinder 8 outsides is sucked in this part.Why damping device 15 can play the effect of damping, is because on the basis of this damping device 15 performance power-assisted effects, if the pressure of the hydraulic oil by this damping device 15 is excessive, can play damping function.Can enter oil hydraulic cylinder 8 by damping high-voltage hydraulic oil, also can flow out oil hydraulic cylinder 8 by damping force hydraulic oil.
When high-pressure and hydraulic oil flows out in oil hydraulic cylinder 8 by damping device 15, hydraulic oil flows into damping device 15 by the oil-feed through hole 32 that goes out oil hole 31 and do not have to hide that part hides, and then flows out damping device 15 from oil-feed through hole 32 that partly hides and the oil hole 31 that goes out that does not hide.When hydraulic oil flows into damping device 15, elastic membrane 22 can be pressed on the end face of valve body 20 at elastic membrane 22 places; When hydraulic oil flow during for damping device 15, can on elastic membrane 22, impact force be arranged effect, make elastic membrane 22 that elastic strains take place, thus the outflow of damping force hydraulic oil.
When hydraulic oil flows into oil hydraulic cylinder 8 by damping device 15, the mechanism of damping device 15 is similar to the above, the elastic membrane 22 that just hides part oil-feed through hole 32 is pressed on the end face of valve body 20, and shielding part is told the elastic membrane 21 generation elastic strains of oil hole 31.Be not described in detail at this.
The damping size of damping device 15 can be determined according to different applied field is incompatible by selecting elastic membrane 22 and controlling by various combination and mounting point that controlling device is set.The structural arrangements of damping device 15 and the principle of work and power are being illustrated that clearly it is to be applicable on the hydraulic power-assist steering system fully that those of ordinary skills understand this damping device 15 on the basis.
According to hydraulic power-assist steering system provided by the invention, owing to have shock-absorbing function in this system, thereby the damping device in the conventional truck can be replaced, only hydraulic power-assist steering system provided by the invention need be installed gets final product, can satisfy the effect of hydraulic booster fully, simultaneously during in vehicle, can effectively vibrations and impact be reduced to minimum, thereby realize shock-absorbing function as violent vibrations and percussion.
Claims (8)
1. damping device, it is characterized in that, described damping device comprises valve body (20), mandrel (21) and elastic membrane (22), described valve body (20) comprises along the oilhole that axially runs through valve body (20) of valve body (20), described valve body (20) also comprises the center hole that axially runs through valve body (20) (30) along valve body (20), described mandrel (21) runs through this center hole (30) and fixedlys connected with valve body (20)
Described oilhole comprises oil-feed through hole (32) and goes out oil hole (31), and on an end face of described valve body (20), described oil-feed through hole (32) is higher than the described oil hole (31) that goes out; On the other end of described valve body (20), described oil-feed through hole (32) is lower than the described oil hole (31) that goes out,
Described elastic membrane (22) is installed on described mandrel (21) and goes up and contact with two end faces of described valve body (20) respectively, be higher than at described oil-feed through hole (32) on the end face of the described described valve body (20) that goes out oil hole (31), described elastic membrane (22) part covers oil-feed through hole (32); Be lower than at described oil-feed through hole (32) on the end face of the described described valve body (20) that goes out oil hole (31), described elastic membrane (22) part covers out oil hole (31).
2. damping device according to claim 1, wherein, be higher than the area of opening of the described oil-feed through hole (32) on the end face of the described described valve body (20) that goes out oil hole (31) greater than the described area that goes out the opening of oil hole (31) on the end face that is lower than the described described valve body (20) that goes out oil hole (31) at described oil-feed through hole (32) at described oil-feed through hole (32).
3. damping device according to claim 1 and 2, wherein, described damping device also comprises controlling device, described controlling device comprises back-up ring (23) and snap ring (27), this back-up ring (23) is connected in described mandrel (21), described snap ring (11) is fixedly connected on the described mandrel (21), described elastic membrane (22) is positioned between described valve body (20) and the back-up ring (23), described back-up ring (23) is positioned between described elastic membrane (22) and the snap ring (27), and described elastic membrane (22) closely contacts with back-up ring (23).
4. damping device according to claim 3, wherein, near the diameter of the back-up ring (23) of the elastic membrane (22) that contacts with oil-feed through hole (32) less than near with the diameter of another back-up ring (23) that goes out the elastic membrane (22) that oil hole (31) contacts.
5. damping device according to claim 3, wherein, described controlling device also comprises spacing cutting ferrule (24), elastic element (25) and block (26), described spacing cutting ferrule (24) is connected in described mandrel (21) with block (26), described elastic element (25) is provided with around described spacing cutting ferrule (24), and this elastic element (25) is positioned between described spacing cutting ferrule (24) and the block (26), described spacing cutting ferrule (24), elastic element (25) and block (26) are positioned between described back-up ring (23) and the snap ring (27), have the gap between described spacing cutting ferrule (24) and the described block (26).
6. hydraulic power-assist steering system, this system comprises dynamical element, executive component and control unit, described dynamical element comprises oil pump (1) and oil pipe (3); Described executive component comprises oil hydraulic cylinder (8); Described control unit comprises control valve (9), described oil pump (1) is connected by described oil pipe (3) with control valve (9), described control valve (9) is connected with oil hydraulic cylinder (8), it is characterized in that, described hydraulic power-assist steering system also has damping device (15), this damping device (15) is any described damping device among the claim 1-5, and described damping device (15) is installed in the hydraulic circuit of described hydraulic power-assist steering system.
7. hydraulic power-assist steering system according to claim 6, wherein, described damping device is arranged in the oil hydraulic circuit of described hydraulic power-assist steering system, and hydraulic oil flow is through this damping device (15).
8. hydraulic power-assist steering system according to claim 7, wherein, has steering piston (14) in the described oil hydraulic cylinder (8), this steering piston (14) is divided into two-part with oil hydraulic cylinder (8), and described damping device (15) is installed in (8) two parts of described oil hydraulic cylinder place, hydraulic oil gateway separately respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006101726177A CN101210598B (en) | 2006-12-30 | 2006-12-30 | Damping device and hydraulic power-assist steering system using the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006101726177A CN101210598B (en) | 2006-12-30 | 2006-12-30 | Damping device and hydraulic power-assist steering system using the same |
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| Publication Number | Publication Date |
|---|---|
| CN101210598A CN101210598A (en) | 2008-07-02 |
| CN101210598B true CN101210598B (en) | 2010-10-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2006101726177A Active CN101210598B (en) | 2006-12-30 | 2006-12-30 | Damping device and hydraulic power-assist steering system using the same |
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| Country | Link |
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| CN (1) | CN101210598B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107458569B (en) * | 2017-07-13 | 2019-02-26 | 江苏科技大学 | It is a kind of to subtract the marine main engine pedestal for shaking vibration damping |
| CN113883211B (en) * | 2021-09-08 | 2023-04-07 | 桂林电子科技大学 | Hydraulic damping device for truck suspension |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0228033A2 (en) * | 1985-12-27 | 1987-07-08 | Toyota Jidosha Kabushiki Kaisha | Valve structure of hydraulic buffer |
| US4821852A (en) * | 1986-07-25 | 1989-04-18 | Toyota Jidosha Kabushiki Kaisha | Shock absorber |
| CN2403604Y (en) * | 2000-01-14 | 2000-11-01 | 上海同捷科技有限公司 | Vibration-damper valve |
| CN2814009Y (en) * | 2005-06-23 | 2006-09-06 | 万向钱潮股份有限公司 | Vibration-damper base valve |
-
2006
- 2006-12-30 CN CN2006101726177A patent/CN101210598B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0228033A2 (en) * | 1985-12-27 | 1987-07-08 | Toyota Jidosha Kabushiki Kaisha | Valve structure of hydraulic buffer |
| US4821852A (en) * | 1986-07-25 | 1989-04-18 | Toyota Jidosha Kabushiki Kaisha | Shock absorber |
| CN2403604Y (en) * | 2000-01-14 | 2000-11-01 | 上海同捷科技有限公司 | Vibration-damper valve |
| CN2814009Y (en) * | 2005-06-23 | 2006-09-06 | 万向钱潮股份有限公司 | Vibration-damper base valve |
Non-Patent Citations (1)
| Title |
|---|
| JP特开2004-301204A 2004.10.28 |
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| CN101210598A (en) | 2008-07-02 |
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| SE01 | Entry into force of request for substantive examination | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Shenzhen BYD Auto Co., Ltd. Assignor: Biyadi Co., Ltd. Contract fulfillment period: 2008.4.25 to 2016.7.11 contract change Contract record no.: 2008440000079 Denomination of invention: Damping device and hydraulic power-assist steering system using the same License type: General permission Record date: 2008.5.13 |
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| LIC | Patent licence contract for exploitation submitted for record |
Free format text: COMMON LICENCE; TIME LIMIT OF IMPLEMENTING CONTACT: 2008.4.25 TO 2016.7.11 Name of requester: BIYADI AUTOMOBILE CO., LTD., SHENZHEN CITY Effective date: 20080513 |
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| C14 | Grant of patent or utility model | ||
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