CN100366490C - Power steering device - Google Patents
Power steering device Download PDFInfo
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- CN100366490C CN100366490C CNB2004100453169A CN200410045316A CN100366490C CN 100366490 C CN100366490 C CN 100366490C CN B2004100453169 A CNB2004100453169 A CN B2004100453169A CN 200410045316 A CN200410045316 A CN 200410045316A CN 100366490 C CN100366490 C CN 100366490C
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Abstract
The present invention relates to a power assisted steering device which can avoid residual pressure generated in a low pressure lateral passage when the positive rotation and the reverse rotation of an oil pump are exchanged and can avoid operation exacerbation. According to the operation for the rotation of a steering wheel, corresponding to a first and a second oil pressure chambers (6, 7) of a hydraulic cylinder (1), a reversible oil pump (11) supplies and exhausts hydraulic pressure by a first and a second passages (8, 9), and therefore, vehicle wheels are controlled and operated. Double discharge passages (13, 14) used for relatively leading oil pressure in each passage to be discharged into an oil storage tank (12) are arranged. Simultaneously, in each discharge passage, according to a pressure difference of the first and the second passages when the oil pump works, a free piston (27) slides, and each lift valve body (25, 26) controls the on-off of the discharge passages correspondingly to discharge actuating oil in the low pressure lateral passage to the oil storage tank.
Description
Technical field
For example the present invention relates to make the work of start oil hydraulic cylinder, to give actuating force or handle power-assisted power steering gear with this by moment corresponding to the manipulation input media input that turns to from self-moving vehicle etc.
Background technology
As this available dynamic steering hardware, for example known have a content described in the following patent documentation 1.
This power steering gear has the control lever shaft that is installed on the bearing circle, the output shaft that links this control lever shaft bottom, be located at tooth bar, the miniature gears of this output shaft bottom, be connected in tooth bar and as the start oil hydraulic cylinder of start oil pressure actuator, the start oil pressure is relatively supplied with the reversible type oil pump of first, second start hydraulic chamber of the left and right sides that the piston by this start oil hydraulic cylinder is divided into by first path and alternate path, and be located at the bypass path that connects between aforementioned first, second path, and open and close the electromagnetic switching valve of this bypass path.
In vehicle to run, handle about common as being undertaken by bearing circle, the testing agency that detects this operating torque by control loop to aforementioned electromagnetic valve output channel closing signal, simultaneously, make reversible type oil pump forward or reverse, with either party's start hydraulic chamber or the start oil phase in the path to supplying with the opposing party's start hydraulic chamber or path.
The start oil that has been full of the whole loop circuit of aforementioned the opposing party's start hydraulic chamber or path is pressurizeed by aforementioned reversible type pump; But the path pipe arrangement that is accompanied by this this opposing party of pressurization expands, and the crowded volume broken, the path pipe arrangement of bubble of sneaking in the start oil increases emptily.Therefore, increase, from oil tank start oil is sucked in the path, pressurizeed by the reversible type pump, give the manipulation power-assisted whereby by check valve in order to compensate this volume.
Patent documentation 1
Japanese kokai publication sho 59-118569 communique
But in aforementioned prior art, the volume of path pipe arrangement increases degree and supplies with compensation by oil tank, produces deviation by start oil mass first path of this compensation and the start oil mass of alternate path.Therefore, rotate when a side passage side is supplied with start oil to reverse direction from positive veer at the reversible type oil pump, because the start oil mass of aforementioned the opposing party's passage side of having pressurizeed has had more compensation rate, probably the pressure of this opposing party's passage side can reduce, and speed is slack-off and produce residual voltage.
Thereby, start oil at a square tube trackside is pressurized, when the start oil pressure rises, as long as the start oil of a square tube trackside is not pressurized to more than the residual voltage of aforementioned the opposing party's passage side, promptly can't handle power-assisted, produce slow, the rapid moment change of generation on bearing circle of power-assisted, may cause handling to feel and worsen.
Summary of the invention
The present invention promptly is because the technical task of aforementioned existing power steering gear proposes.
First invention is a kind of power steering gear, described power steering gear, according to input torque from the output of manipulation input media, by the reversible type pump by the oil pressure supply passageway that constitutes by first path and alternate path with respect to be divided into by hydraulic cylinder piston first, second hydraulic pressure chamber carries out the row of giving of hydraulic pressure, control the manipulation wheel with this, it is characterized in that: be provided with and doublely go out path what the hydraulic oil in aforementioned first path and the alternate path was discharged to oil tank, simultaneously, in this each drain passageway, a pair of transfer valve is set, described a pair of transfer valve makes aforementioned first in the work of aforementioned reversible type pump, when the interior voltage rise of a side path is high in the alternate path, close the drain passageway of this high pressure side path, and open the drain passageway of low pressure side path.
Thereby, as according to this invention, as rotating steering dish, reversible type pump work to a direction, for example with hydraulic pressure supply to first passage side, transfer valve in the drain passageway of closing first passage side, open the alternate path side drain passageway, be communicated with oil tank.Thus, the start oil pressure of this alternate path and the second start hydraulic chamber side nearly all supplies to the first start hydraulic chamber by the reversible type pump by first path, and the drain passageway of its part by the alternate path side is discharged to oil tank rapidly.
Thereby, accelerate in the differential pressure low velocity of alternate path side, can prevent that residual voltage from producing.Its result can handle power-assisted fast, can prevent to produce rapid moment change at bearing circle, can obtain good manipulation sense.
Second invention be characterised in that, aforementioned transfer valve is disposed at and aforementionedly doublely goes out between path, according to aforementioned first path aforementioned each drain passageway of the relative switching of difference of pressure with alternate path.
As according to this invention,,, can suppress the cost rising so be expected to simplify control and the structure that is used to switch owing to be not with electric approach but mechanically carry out the work of transfer valve by the pressure reduction of two paths.
The 3rd invention is characterised in that, is configured to the valve body of aforementioned each drain passageway of the aforementioned transfer valve of switch by the poppet valve body.
As according to this invention, because valve body is become the poppet valve valve body, so can prevent that the valve body that the so-called dirt by metal powder etc. causes is locked, can guarantee stable operation.
The 4th invention is characterised in that: aforementioned each poppet valve body can be contained in with being free to slide to be arranged in a pair of valve opening, to have and this valve opening is divided into first Room and second Room is the sealing of back pressure chamber; Aforementioned first Room is communicated with aforementioned oil pressure supply passageway and oil tank, and is controlled by the switch work of poppet valve and to switch being communicated with/cutting off of aforementioned oil pressure supply passageway and oil tank; Aforementioned second Room is communicated to aforementioned oil pressure supply passageway, has the compression face that the oil pressure supplied with by aforementioned reversible type pump is energized to the first Room direction to poppet valve in the second Room side of aforementioned poppet valve.
As complying with this invention, since by sealing be divided into first Room that is communicated with oil tank and the oil pressure supplied with by the reversible type pump to poppet valve to second Room that compression face faced toward that the first Room direction is energized, so can be really by acting on the pressure reduction partition oil pressure supply passageway of poppet valve front and back and being communicated with of oil tank.
The 5th invention is characterised in that, each poppet valve in aforementioned the 4th invention indoorly has an elastic component that poppet valve is energized to the first Room direction aforementioned second.
As according to this invention, but, be normally closed valve or normally open valve so can freely set transfer valve owing to do not act on the position of state regulation poppet valve in valve opening of poppet valve at oil pressure.In addition, even under the less situation of the oil pressure ratio of before acting on poppet valve, pressing, because elastic component energizes to the first Room direction to poppet valve, so also can cut off being communicated with of oil pressure supply passageway and oil tank really.
The 6th invention be characterised in that, the power steering gear of aforementioned the 5th invention has the connecting path that aforementioned first Room with aforementioned a pair of valve opening is connected with each other and is located at free piston in this connecting path with being free to slide; This free piston moves axially by the pressure reduction of aforementioned first path and alternate path, the aforementioned poppet valve of master cock.
As according to this invention,, leak to low pressure side so can prevent on high-tension side oil pressure, and can open the poppet valve of low pressure side really because the oil pressure that free piston has cut off in the valve opening is communicated with.
The 7th invention be characterised in that, the free piston in the 6th invention has the pressure contact portion of opening valve by means of the aforementioned poppet valve of crimping.
As according to this invention because the direct crimping poppet valve of pressure contact portion is opened valve, than can guarantee to open poppet valve really in only opening valve by oil pressure.
The 8th invention be characterised in that, the pressure contact portion in the 7th invention is connected to the poppet valve of both sides when aforementioned reversible type pump off working state.
As according to this invention, when the reversible type pump was off working state, pressure contact portion is the poppet valve of butt both sides not, can not open poppet valve be connected to poppet valve to pressure contact portion after free piston work before; And at the reversible type pump under off working state, when pressure contact portion is connected to the poppet valve of both sides, move by oil pressure as free piston, then can open poppet valve at once, thereby improve the performance of replying of poppet valve.In addition, when reversible type pump inoperative, because free piston is positioned at the position, middle, so free piston is not partial to any one side, so also can obtain the identical manipulation speed of answer in the left and right sides.
The 9th invention is characterised in that in the power steering gear of the 7th invention, to have a pair of elastic component between aforementioned free piston and a pair of aforementioned poppet valve.
As complying with this invention, because when reversible type pump inoperative, free piston is positioned at center position, free piston is not partial to any side, so can obtain the identical manipulation speed of answer in the left and right sides.
The tenth invention be characterised in that, the poppet valve in the 4th invention, and the switching part that is communicated with/cuts off of aforementioned oil pressure supply passageway and oil tank is switched in its control, forms coniform.
As according to this invention, owing to be difficult for entering foreign matter such as dirt in the switching part, so can prevent that poppet valve is locked.
The 11 invention is characterised in that, in the power steering gear of the 4th invention, is communicated with the discharge road of aforementioned first Room and oil tank, at the oil tank upstream side two first Room is interconnected.
As according to this invention because direct first Room of supply the opposing party side of the start oil of discharging from first Room of side's side, so first Room of the opposing party's side needn't suck start oil from oil tank, about start oil flow between first Room good.Therefore, the manipulation sense in the time of can improving reversible type pump inoperative.
The invention of the tenth binomial is characterised in that in the power steering gear of the 4th invention, aforementioned second Room has pair of openings portion, and the peristome of side's side is communicated to the aforementioned oil pressure supply passageway of aforementioned reversible type pump side; The peristome of the opposing party's side is communicated to the oil pressure supply circuit of aforementioned hydraulic cylinder side.
As according to this invention, the oil pressure of oil pressure supply passageway can not supplied with second Room owing to do not need to establish tributary circuit in addition, so but the structure of simplification device from the oil pressure supply passageway.
The 13 invention is characterised in that in the power steering gear of first invention, aforementioned transfer valve when aforementioned reversible type pump is off working state, is opened the aforementioned drain passageway of both sides.
As according to this invention, be in off working state at the reversible type pump, during promptly at straight moving condition, two hydraulic pressure chambers of hydraulic actuating cylinder are identical with oil pressure pressure in the oil tank, handle and feel the nature that becomes.In addition, owing to not residual fully residual voltage in the oil pressure supply passageway can be avoided turning to either party's the state of energizing to the left and right that applies.
The 14 invention is characterised in that in the power steering gear of first invention, aforementioned transfer valve when aforementioned reversible type pump is off working state, cuts out the aforementioned drain passageway of both sides.As according to this invention, when the reversible type pump was off working state, the drain passageway of both sides was opened, till closing until the transfer valve of pressure side during because oil pressure leaks to oil tank from this transfer valve, handle and reply performance and reduce; And when the reversible type pump is off working state, if the drain passageway of both sides closes, owing to there is not the oil pressure of pressure side to leak to oil tank, so the replying performance and can not reduce of manipulation.
Description of drawings
Fig. 1 is the expression oil hydraulic cylinder that provides of first embodiment of the invention and the skeleton diagram of oil hydraulic circuit.
Fig. 2 is the skeleton diagram of the effect of expression present embodiment.
Fig. 3 is the skeleton diagram of the effect of expression present embodiment.
Fig. 4 is the longitudinal diagram of the transfer valve of expression second embodiment of the invention.
Fig. 5 is the longitudinal diagram of the transfer valve of expression third embodiment of the invention.
The specific embodiment
Each embodiment of power steering gear of the present invention is described in detail in detail based on accompanying drawing below.
Fig. 1 shows first embodiment of the invention, mainly be the oil hydraulic cylinder 1 and oil hydraulic circuit 2 of having recorded and narrated power steering gear, summary situation as device, it is by constituting with the lower part: as the not shown bearing circle of handling input media, be located at the rack pinion of the output shaft of the control lever shaft bottom that links this bearing circle, be located at the output shaft lower end side, and be used for detecting the manipulation rotating torque of bearing circle and go into the detecting device of power from the road surface that left and right sides front-wheel comes, be linked to the aforementioned oil hydraulic cylinder 1 of aforementioned tooth bar, and the oil hydraulic circuit 2 of discharging the start oil pressure to this oil hydraulic cylinder 1.
Aforementioned oil hydraulic cylinder 1, the piston rod 4 that links aforementioned tooth bar simultaneously, are being fixed the piston 5 that slides through in vehicle-body width direction is extended the tubular cylinder portion 3 that is provided with in tubular cylinder portion 3 on this piston rod 4.In addition, in tubular cylinder portion 3, first hydraulic chamber 6 and second hydraulic chamber 7 about being divided into by piston 5.
Aforementioned oil hydraulic circuit 2 has: at one end portion connects aforementioned each hydraulic chamber 6,7 a pair of first, alternate path 8,9, be connected in this two path 8, the other end of 9 also can be by 1 reversible type oil pump 11 of pump motor 10 its rotatings of driving, be connected to aforementioned first, alternate path 8,9 and midway, and its each downstream end is communicated with first of oil tank 12, second drain passageway 13,14, be located at this and doublely go out path 13,14, according to aforementioned each path 8, aforementioned each drain passageway 13 of the relative switch of pressure reduction in 9,14 and switch to the transfer valve that is communicated with 15 with oil tank 12 relatively, aforementioned first, alternate path 8,9 upstream side is respectively by compensation path 16,17 will compensate with the start oil phase and supply with each path 8 over the ground, 9 first, second oil tank 18,19.
The aforementioned double path 13,14 that goes out is connecting the discharge road 20 that is communicated with oil tank 12 at the connecting portion of its each downstream end; Simultaneously, in this discharge road 20, be provided with and only allow that start oil flows to the check valve 21 of oil tank 12 from each path 8,9.
Aforementioned each poppet valve body 25,26 one-tenth series connection shapes are disposed in each valve body 23,24, simultaneously, form step-like cylindrically, and mainly are made of the 25a of valve portion, 26a and major diameter rearward end 25b, 26b.Its each relative front end face of the described valve 25a of portion, 26a roughly forms coniform; Described each major diameter rearward end 25b, 26b bear the start oil pressure in aforementioned each path 8,9 in the back pressure chamber 30,31 of valve body 23,24 bottom sides.In addition, be integrally formed with butt axle 25c, the 26c of the both ends of the surface of the center shaft 27a that is connected to aforementioned free piston 27 respectively at the relative leading section of each 25a of valve portion, 26a.
Each poppet valve body 25,26 is energized to the direction of aforementioned free piston 27 in the bottom surface of valve body 23,24 and the elastic force of the coil spring between rearward end 25b, 26b 28,29 by elastomeric mounting, when the off working state of aforementioned oil pump 11, maintain a neutral position, close the so-called closed type of each drain passageway 13,14 at multiple seat surface of this state each 25a of valve portion, 26a, one-tenth in valve body 23,24 front ends.
Aforementioned free piston 27, according to the pressure reduction of 8,9 in aforementioned each path, promptly comply with pressure reduction left and right directions slip in figure of 32,33 to pressure chamber that each drain passageway 13,14 forms in each path 8,9 midway, the poppet valve body 25,26 that the elastic force that overcomes relative coil spring 28,29 makes either party direction forwards, backwards switches slip relatively.
In addition, respectively compensate path 16,17 midway, be provided with first, second check valve 34,35 that the start oil in aforementioned first, second oil tank 18,19 is only flowed into to each path 8,9 direction aforementioned.
And, in the suction path 36 of aforementioned oil pump 11, be provided with the check valve 37 that the start oil of only allowing oil tank 12 flows into to oil pump 11 directions.
Bottom illustrates the effect of present embodiment.At first, medium in directly walking of vehicle, chaufeur is the rotating operation bearing circle not, and the state of maintaining a neutral stance is not exported control current, 11 one-tenth off working states of oil pump from electronic controller to pump motor 10.In this case, as shown in Figure 1 owing in each path 8,9, do not produce pressure reduction, each poppet valve valve body 25,26 with the elastic force of each coil spring 28,29 by free piston 27 position of maintaining a neutral stance.Thereby the multiple seat of each 25a of valve portion, 26a becomes to close the state of each drain passageway 13,14 in each seat surface.
Then, as turning clockwise direction of operating dish, the control current of being come by electronic controller for example drives oil pump 11 forward rotation by pump motor 10.By this pumping action, as shown in Figure 2, the start oil in the alternate path 9 is inhaled into and is discharged in first path 8, then, the start oil in first path 8, it is most of by back pressure chamber 30 inflows first hydraulic chamber 6, simultaneously, its part flows in first compression chamber 32 by first drain passageway 13.Simultaneously, the start oil in first oil tank 18 also flows into first path 8 and the first start hydraulic chamber 6 by oil pump 11, to cover the shortage.
Thus, 32 one-tenth high pressure of first compression chamber, simultaneously, 33 one-tenth low pressure of second compression chamber, because like this, as shown in the figure, free piston 27 slides to the second poppet valve valve body, 26 directions (left), and the elastic force that overcomes coil spring 29 makes the second poppet valve valve body 26 retreat to back pressure chamber 31 directions.Simultaneously, leave the first poppet valve body 25.
Thereby first drain passageway 13 is kept closed condition, and second drain passageway 14 is opened compression chamber 33 sides, and the part of the start oil in the alternate path 9 as shown by arrows, is discharged to rapidly in the oil tank 12 by check valve 21.Therefore, the pressure decay of alternate path 9 sides speeds up, and prevents that residual voltage from producing.
On the other hand,, carry out rotating operation left again, make oil pump 11 counter-rotatings by pump motor 10 by electronic controller as making bearing circle get back to previous status from this turning clockwise serviceability.
Therefore, now as shown in Figure 3,, the start oil of first path, 8 sides and the start oil in second oil tank 19 are discharged in the alternate path 9, supply with second hydraulic chamber 7 by back pressure chamber 31 with aforementioned opposite.
Thereby the internal drop of first compression chamber 32 is low, and the interior voltage rise height of second compression chamber 33, free piston 27 slides to the right as shown in the figure, and the elastic force that overcomes coil spring 28 makes the first poppet valve body 25 retreat to back pressure chamber 30 directions, simultaneously, leave the second poppet valve body 26.
Thus, second drain passageway 14 is closed, and first drain passageway 13 is then opened first compression chamber, 32 sides, and the part of the start oil in first path 8 as shown by arrows, is discharged to rapidly in the oil tank 12 by check valve 21.Therefore, the differential pressure low velocity of these first path, 8 sides is accelerated, and as hereinbefore, can prevent that residual voltage from producing.
Like this, when the bearing circle left-right rotation was operated, because the interior pressure of the path 8,9 that becomes low pressure one side is reduced rapidly, the manipulation power-assisted of travel direction dish can prevent to produce rapid moment change at bearing circle, thereby can obtain good operation sense rapidly.
In addition, owing to be pressure reduction,, compare, be expected to simplify control with the electric apparatus that uses electromagnetic valve etc. promptly by the work of aforementioned each the poppet valve body 25,26 of pressure reduction control of each compression chamber 32,33 with first, second path 8,9; Simultaneously, owing to be that simple machinery constitutes, easy to manufacture, can limit cost and raise.
Also have,, for example be difficult for entering foreign matters such as dirt, produce deadlock phenomenon so can prevent each 25a of valve portion, 26a because the front end face of the 25a of valve portion, 26a is by a pair of poppet valve body 25,26 formations of coniform (inclined plane type).
Fig. 4 shows second embodiment of the invention, is that the tectonic transition with transfer valve 15 becomes so-called open type.
That is, the axial length of the center shaft 27a of aforementioned free piston 27 is set at the specified amount of direction elongation to the left and right, each poppet valve body 25,26 is partial to each back pressure chamber 30,31 directions configuration slightly.
Thereby, when bearing circle carries out the left-right rotation operation, the same with first embodiment, according to the pressure reduction in first, second path 8,9 free piston 27 is horizontally slipped, open a certain side's drain passageway 13,14 by poppet valve body 25,26, can prevent to produce residual voltage thus, nature can play and aforementioned same action effect; Do not carry out the neutral condition of rotating operation at bearing circle, free piston 27 remains in left and right sides center position, and each valve body 25a, 26a leave seat surface, open each drain passageway 13,14.Therefore can guarantee the state that is interconnected of each drain passageway 13,14.
Fig. 5 has represented the 3rd embodiment, is basic comprising with the open type transfer valve 15 of second embodiment, and 25,26 of the two sides of free piston 27 and poppet valve bodies, elastomeric mounting has coil spring 37,38 respectively.
Thereby, as complying with this embodiment, by the relative elastic force of the coil spring in said spiral spring 37,38 and each back pressure chamber 30,31 28,29 with each poppet valve body 25,26 enforceable center position that remain in, therefore, when oil pump 11 inoperatives, can guarantee each drain passageway 13,14 is forced into open mode.As according to this, when pump is locked, can guarantee manual steering, can obtain fail safe function.
For the technical conceive outside the summary of the invention that can hold from previous embodiment, as hereinafter, (a) and (b) are described.
(a) in second described power steering gear of invention, it is characterized in that aforementioned transfer valve has a pair of valve opening, a pair of valve body and free piston.Described a pair of valve opening crosses aforementioned first, second path respectively and forms, and aforementioned each drain passageway is communicated in the center side that is interconnected; Described a pair of valve body can be located at aforementioned two valve opening inside with being free to slide, based on the pressure reduction of aforementioned first, second path aforementioned each drain passageway of switch relatively; Described free piston can be located in central authorities are communicated with intercommunicating pore between aforementioned two valve openings to each valve body direction with being free to slide, the activated position of aforementioned each valve body of pressure reduction control by aforementioned each path of aforementioned each drain passageway impression.
As according to this invention, because being machinery, transfer valve integral body constitutes, to compare with the electromagnetic type of high price, nature can limit cost up; Particularly, free piston is directly experienced the pressure reduction of each path, is accompanied by the slip of this free piston, the activated position of each valve body of may command, so unitary construction simplification, and can obtain the good start control of aforementioned valve body.
(b) in the first～three each described power steering gear of invention, it is characterized in that, the downstream of aforementioned each drain passageway is connected with each other, and opens aforementioned transfer valve during for inoperative at aforementioned reversible type pump, is communicated with two drain passageways, forms open type.
As according to this invention, when vehicle was directly walked, bearing circle became under the neutral condition situation, owing to doublely go out path and become connected state, also can guarantee manual steering when pump is locked, obtained fail safe function.
The present invention also is not limited to the formation of aforementioned each embodiment, for example, also can be without free piston 27, and change the compression area of the interior pressure of experiencing each compression chamber 32,33 of the compression area of the interior pressure of experiencing back pressure chamber 30,31 of rearward end 25b, 26b of each poppet valve 25,26 and valve body 25a, 26a, directly make each poppet valve body 25,26 work by this pressure difference.
Claims (14)
1. power steering gear, described power steering gear, according to the row of giving that carries out hydraulic pressure from the input torque of manipulation input media output, by the reversible type pump by the oil pressure supply passageway that constitutes by first path and alternate path with respect to first, second hydraulic pressure chamber that is divided into by hydraulic cylinder piston, control the manipulation wheel with this, it is characterized in that:
Be provided with and doublely go out path what the hydraulic oil in aforementioned first path and the alternate path was discharged to oil tank, simultaneously, in this each drain passageway, a pair of transfer valve is set, when the interior voltage rise of described a pair of transfer valve path of a side in the work of aforementioned reversible type pump makes aforementioned first, second path is high, close the drain passageway of this high pressure side path, and open the drain passageway of low pressure side path.
2. by the described power steering gear of claim 1, it is characterized in that aforementioned transfer valve is disposed at and aforementionedly doublely goes out between the path, and constitute according to the difference of pressure of aforementioned first path and alternate path aforementioned each drain passageway of switch relatively.
3. by the described power steering gear of claim 2, it is characterized in that aforementioned transfer valve is made of the valve body of aforementioned each drain passageway of switch the poppet valve body.
4. by the described power steering gear of claim 3, it is characterized in that:
Aforementioned each poppet valve body can be contained in with being free to slide to be arranged in a pair of valve opening, to have and this valve opening is divided into first Room and second Room is the sealing of back pressure chamber;
Aforementioned first Room is communicated with aforementioned oil pressure supply passageway and oil tank, and is controlled by the switch work of poppet valve body and to switch being communicated with/cutting off of aforementioned oil pressure supply passageway and oil tank;
Aforementioned second Room is communicated to aforementioned oil pressure supply passageway, has the compression face that the oil pressure supplied with by aforementioned reversible type pump is energized to the first Room direction to the poppet valve body in the second Room side of aforementioned poppet valve body.
5. by the described power steering gear of claim 4, it is characterized in that aforementioned each poppet valve body indoorly has an elastic component that the poppet valve body is energized to the first Room direction aforementioned second.
6. by the described power steering gear of claim 5, it is characterized in that having the connecting path that aforementioned first Room with aforementioned a pair of valve opening is connected with each other and be located at free piston in this connecting path with being free to slide;
Aforementioned free piston moves axially by the pressure reduction of aforementioned first path and alternate path, the aforementioned poppet valve body of master cock.
7. by the described power steering gear of claim 6, it is characterized in that aforementioned free piston has the pressure contact portion of opening valve by means of the aforementioned poppet valve body of crimping.
8. by the described power steering gear of claim 7, it is characterized in that aforementioned pressure contact portion when aforementioned reversible type pump is off working state, is connected to the poppet valve body of both sides.
9. by the described power steering gear of claim 7, it is characterized in that between aforementioned free piston and a pair of aforementioned poppet valve body, having a pair of elastic component.
10. by the described power steering gear of claim 4, it is characterized in that, aforementioned poppet valve body, the switching part that is communicated with/cuts off of aforementioned oil pressure supply passageway and oil tank is switched in its control, forms coniform.
11., it is characterized in that by the described power steering gear of claim 4, be communicated with the drain passageway of aforementioned first Room and oil tank, at the oil tank upstream side two first Room are interconnected.
12. by the described power steering gear of claim 4, it is characterized in that aforementioned second Room has pair of openings portion, the peristome of side's side is communicated to the aforementioned oil pressure supply passageway of aforementioned reversible type pump side; The peristome of the opposing party's side is communicated to the oil pressure supply circuit of aforementioned hydraulic cylinder side.
13., it is characterized in that aforementioned transfer valve when aforementioned reversible type pump is off working state, is opened the aforementioned drain passageway of both sides by the described power steering gear of claim 1.
14., it is characterized in that aforementioned transfer valve when aforementioned reversible type pump is off working state, cuts out the aforementioned drain passageway of both sides by the described power steering gear of claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100453169A CN100366490C (en) | 2004-05-20 | 2004-05-20 | Power steering device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100453169A CN100366490C (en) | 2004-05-20 | 2004-05-20 | Power steering device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1699104A CN1699104A (en) | 2005-11-23 |
| CN100366490C true CN100366490C (en) | 2008-02-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100453169A Expired - Fee Related CN100366490C (en) | 2004-05-20 | 2004-05-20 | Power steering device |
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| CN (1) | CN100366490C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101870357B (en) * | 2010-06-23 | 2013-01-23 | 南京航空航天大学 | Nose wheel steering control mechanism of semi-annular actuating cylinder |
| CN104670315B (en) * | 2013-11-29 | 2017-08-22 | 比亚迪股份有限公司 | For the unmanned steering system of vehicle and the vehicle with the unmanned steering system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5279380A (en) * | 1992-03-27 | 1994-01-18 | Imra America, Inc. | Hydrostatic power steering system |
| JP2002154444A (en) * | 2000-11-21 | 2002-05-28 | Unisia Jecs Corp | Steering control device of vehicle |
| JP2003112640A (en) * | 2001-10-03 | 2003-04-15 | Hitachi Unisia Automotive Ltd | Steering controller for vehicle |
| JP2003237601A (en) * | 2002-02-15 | 2003-08-27 | Hitachi Unisia Automotive Ltd | Power steering device |
-
2004
- 2004-05-20 CN CNB2004100453169A patent/CN100366490C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5279380A (en) * | 1992-03-27 | 1994-01-18 | Imra America, Inc. | Hydrostatic power steering system |
| JP2002154444A (en) * | 2000-11-21 | 2002-05-28 | Unisia Jecs Corp | Steering control device of vehicle |
| JP2003112640A (en) * | 2001-10-03 | 2003-04-15 | Hitachi Unisia Automotive Ltd | Steering controller for vehicle |
| JP2003237601A (en) * | 2002-02-15 | 2003-08-27 | Hitachi Unisia Automotive Ltd | Power steering device |
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| CN1699104A (en) | 2005-11-23 |
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