CN102700603B - Emergency two-circuit power steering system - Google Patents

Emergency two-circuit power steering system Download PDF

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Publication number
CN102700603B
CN102700603B CN 201210176375 CN201210176375A CN102700603B CN 102700603 B CN102700603 B CN 102700603B CN 201210176375 CN201210176375 CN 201210176375 CN 201210176375 A CN201210176375 A CN 201210176375A CN 102700603 B CN102700603 B CN 102700603B
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CN
China
Prior art keywords
pump
steering
oil
main
circular groove
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Application number
CN 201210176375
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Chinese (zh)
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CN102700603A (en
Inventor
李红亮
雷洪闯
王小侠
张晓航
杨斌
闫维军
Original Assignee
陕西秦川机械发展股份有限公司
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Priority to CN 201210176375 priority Critical patent/CN102700603B/en
Publication of CN102700603A publication Critical patent/CN102700603A/en
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Publication of CN102700603B publication Critical patent/CN102700603B/en

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Abstract

The invention relates to an emergency two-circuit power steering system, which comprises a main oil tank and an auxiliary oil tank, wherein the main oil tank is communicated with a steering engine and a steering assistance cylinder through a main steering pump to constitute a main steering system, the auxiliary oil tank is communicated with the steering engine and the steering assistance cylinder through an emergency pump and an emergency valve to constitute a steering emergency system, and the steering emergency system can ensure oil supply to the steering engine when the main steering system is failed and can not work normally so as to maintain the normal work of the steering engine. When an engine and the main steering system are failed, a running vehicle is enabled to have a steering capacity, the steering performance of a heavy vehicle, particularly the steering performance under an overload state, is improved, and at the same time the service life of the steering oil pump is prolonged. Through verification, when vehicles of the same type are provided with different steering systems, the service life is prolonged by more than 2 times.

Description

A kind of emergency double loop steering boost system
Technical field
The invention belongs to hydrostatic steering system, relate to the car emergency steering swivel system, be specifically related to a kind of emergency double loop steering boost system.
Background technology
Development along with auto-industry, the increase of carload quality, existing hydrostatic steering system can meet GB17675 standard and the standard EN 71/311/EEC of European Union under normal operation, but under system durability decline or failure conditions, motor turning lost efficacy, do not meet above-mentioned standard-required, and safety misadventure very easily occurs.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, the object of the present invention is to provide a kind of emergency double loop steering boost system, realize the hydrostatic steering system safety guard-safeguard, thereby extend system life.
To achieve these goals, the technical solution used in the present invention is:
A kind of emergency double loop steering boost system, comprise main oil tank 29, main oil tank 29 is communicated with steering box 33 by main steering pump 28 and steering actuation cylinder 27 formations turn to main system, also comprise secondary oil tank 30, secondary oil tank 30 is communicated with steering box 33 by jury pump 31 and guard valve 32 and steering actuation cylinder 27 formations turn to calibration package.
Main pump oil inlet P, jury pump oil inlet P 2, oil return inlet T and oil outlet A are arranged on described guard valve 32, the main pump oil inlet P connects the outlet of main steering pump 28, jury pump oil inlet P 2 connects the outlet of jury pump 31, and the oil return inlet T tieback is to secondary oil tank 30, and oil outlet A connects steering box 33.
Described jury pump 31 comprises the front pump housing 45 connected successively with eccentric speed reduction mechanism, middle pump body 46 and the rear pump housing 47, the oil inlet 49 that is communicated to eccentric speed reduction mechanism is set on the rear pump housing 47, a plurality of radial holes 48 are arranged on described middle pump body 46, the interior plunger 34 that arranges respectively of each radial hole 48 forms the pump oil subsystem, plunger 34 bottoms coordinate with the eccentric excircle of eccentric speed reduction mechanism, piston spring 35 is set in the endoporus of plunger 34, plug 36 is arranged on radial hole 48 ends plunger 34 and piston spring 35 is enclosed in hole, the outlet of described pump oil subsystem is arranged on the end face of middle pump body 46 and in end face upper outlet position, oil seal piece 37 is set, oil seal piece 37 coordinates in the circular groove 39 that is assemblied in the rear pump housing 47 end faces with disk spring 38, circular groove 39 is communicated with the oil outlet 40 on being arranged on the rear pump housing 47.
Described eccentric speed reduction mechanism comprises eccentric shaft 41, assembling lining 42 on the eccentric excircle of eccentric shaft 41, and the exterior outer shaft 43 of lining 42, described outer shaft 43 coordinates with middle pump body 46 and plunger 34.
Described oil inlet 49 and the eccentric excircle of eccentric shaft 41 arrange thin wall small hole 44 on crossing cross section, form logical oily check valve.
Described guard valve 25 comprises valve body 2, the middle part of valve body 2 arranges horizontal main valve plug 6, it is characterized in that, open successively spaced the first groove 601 and the second groove 602 perpendicular to its length direction on main valve plug 6 lateral surfaces, the aperture 603 of conducting to main valve plug 6 inside arranged on the first groove 601, main valve plug 6 connects little check valve 25 near an end of the second groove 602 by the first spring 5, the other end is main steering pump oil inlet, the downside of main valve plug 6 arranges large check valve 26, the bottom of large check valve 26 is oil outlet, between little check valve 25 and large check valve 26, path is arranged, have first circular groove 201 coaxial with main valve plug 6 in valve body 2, the second circular groove 202 and the 3rd circular groove 203, the top of the first circular groove 201 corresponding large check valves 26, the second circular groove 202 connects the jury pump oil inlet, the 3rd circular groove 203 takes back hydraulic fluid port, described the first groove 601, the second groove 602, the first circular groove 201, the size of the second circular groove 202 and the 3rd circular groove 203 meets: when the first spring 5 compressed, the second circular groove 202, the second groove 602 and the 3rd circular groove 203 form the conducting chamber, the first circular groove 201 and the first groove 601 form the conducting chamber, when the first spring 5 is normal condition, the second circular groove 202 and the first circular groove 201 form the conducting chamber.
Described main valve plug 6 inside arrange minor diameter oil through 604, and the diameter of minor diameter oil through 604 is determined by the elasticity of the switching flow of setting and the first spring 5.
Described aperture 603 has three, evenly is arranged on same cross section.
Described large check valve 26 comprises back taper spool 17, is socketed with the second spring 21 coordinated with its valve seat 20 on the conical surface lower outer diameter of back taper spool 17.
Described return opening position arranges the 3rd plug 11, the three plug 11 inboards the side that the 3rd spring 10, the three springs 10 connect steel ball 8 is set, and the opposite side that is positioned at steel ball 8 on fuel-displaced path arranges pressure sensor 23.
The emergent steering swivel system of the present invention is when any fault appears in driving engine and main steering swivel system, can guarantee that traveling vehicle possesses steering capability, improve the turning efficiency of heavy-duty vehicle, the turning efficiency under overload condition particularly, improve the service life of power steerig pump, by checking, vehicle of the same race simultaneously, assemble different steering swivel systems, system life has improved more than 2 times.
The accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Fig. 2 is the present invention's a kind of jury pump structural representation used.
Fig. 3 is pump body structure schematic diagram after Fig. 2.
Fig. 4 is Fig. 2 middle pump body structural representation.
Fig. 5 be A-A in Fig. 2 to B-B to the turnover oil circuit under view, eccentric shaft left-hand revolution.
Fig. 6 be A-A in Fig. 2 to B-B to the turnover oil circuit under view, eccentric shaft clickwise.
Fig. 7 is the present invention's a kind of guard valve structural representation used.
Fig. 8 is Fig. 7 main valve plug structural representation.
Fig. 9 is Fig. 7 valve body structure schematic diagram.
Figure 10 is Fig. 7 back taper valve core structure schematic diagram.
Figure 11 is Fig. 7 pressure sensor installation site schematic diagram.
Hydraulic schematic diagram of the present invention when Figure 12 is main steering pump normal operation.
Hydraulic schematic diagram of the present invention when Figure 13 is main steering pump malfunction.
The implication of Reference numeral in figure:
The 1-the first plug; 2-valve body; The 3-the first seal ring; The 4-the four plug; The 5-the first spring; 6-main valve plug; The 7-the five plug; 8-steel ball; 9-steel ball seat; The 10-the three spring; The 11-the three plug; The 12-the three pad; The 13-the first collar; The 14-the second plug; The 15-the second seal ring; The 16-the first pad; 17-back taper spool; 18-back-up ring; The 19-the second collar; 20-valve seat; The 21-the second spring; The 22-the second pad; 23-pressure sensor; 24-distance sleeve; 25-little check valve; 26-large check valve; 27-steering actuation cylinder; 28-main steering pump; 29-main oil tank; 30-secondary oil tank; 31-jury pump; 32-guard valve of the present invention; 33-steering box; 34-plunger; 35-piston spring; 36-plug; 37-oil seal piece; 38-belleville spring; 39-circular groove; 40-oil outlet; 41-eccentric shaft; 42-lining; 43-outer shaft; 44-thin wall small hole; 45-front the pump housing; 46-middle pump body; 47-rear the pump housing; 48-radial hole; 49-oil inlet; The 201-the first circular groove; The 202-the second circular groove; The 203-the three circular groove; The 601-the first groove; The 602-the second groove; 603-aperture; 604-minor diameter oil through.
The specific embodiment
Below in conjunction with accompanying drawing, the present invention is described in further details.
As shown in Figure 1, a kind of emergency of the present invention double loop steering boost system, comprise main oil tank 29, main oil tank 29 is communicated with steering box 33 by main steering pump 28 and steering actuation cylinder 27 formations turn to main system, also comprise secondary oil tank 30, secondary oil tank 30 is communicated with steering boxs 33 and steering actuation cylinder 27 by jury pump 31 and guard valve 32 and forms and turn to calibration package, thereby turn to calibration package can make when turning to main system to break down can't to work, guarantees to maintain its normal operation to the fuel feeding of steering box 33.
Main pump oil inlet P, jury pump oil inlet P 2, oil return inlet T and oil outlet A are arranged on above-mentioned guard valve 32, the main pump oil inlet P connects the outlet of main steering pump 28, jury pump oil inlet P 2 connects the outlet of jury pump 31, and the oil return inlet T tieback is to secondary oil tank 30, and oil outlet A connects steering box 33.
When system works:
Main steering pump 28 output fluid advance the main pump oil inlet P of guard valve 32, from oil outlet, A goes out, and passes into steering box 33 and steering actuation cylinder 27 supporting system work, and jury pump 31 output fluid advance the jury pump oil inlet P 2 of guard valve 32, go out from oil return inlet T, return secondary oil tank 30.
When system emergency is worked:
When main steering pump 28 breaks down, main steering pump 28 output fluid advance the main pump oil inlet P of guard valve 32, has (because fault from oil outlet A, the amount of this part fluid is very little), jury pump 31 output fluid advance the jury pump oil inlet P 2 of guard valve 32, from oil outlet, A goes out, and two pump fluid pass into steering box 33 and steering actuation cylinder 27 supporting system work simultaneously, guarantees the system normal operation.
As shown in Figure 2, a kind of concrete structure for the present invention's jury pump 31 used, comprise the front pump housing 45, middle pump body 46 and the rear pump housing 47 that connect successively with eccentric speed reduction mechanism, wherein the front pump housing 45 and the rear pump housing 47 all are encased in the mider hole of middle pump body 46 by stretching out dome, bolts tight for three pump housings, the basic support structure of composition pump.
As shown in Figure 3, for the rear pump housing 47 structural representations of the present invention's jury pump 31 used, the one end has oil inlet 49 and oil outlet 40, and the other end has circular groove 39, oil inlet 49 and the eccentric excircle of eccentric shaft 41 arrange thin wall small hole 44 on crossing cross section, form logical oily check valve.
As shown in Figure 4, for the present invention's jury pump 31 middle pump body 46 structural representations used, eight radial holes 48 are arranged on it, eight pump oil subsystems of corresponding formation, wherein four adjacent radial holes 48 are on a vertical plane, another four radial holes 48 are on another vertical plane, and the interior plunger 34 that arranges respectively of each radial hole 48 forms pump oil subsystem, eight pump oil subsystems of corresponding formation.
Eccentric speed reduction mechanism comprises eccentric shaft 41, assembling lining 42 on the eccentric excircle of eccentric shaft 41, and the exterior outer shaft 43 of lining 42, the three forms eccentric speed reduction mechanism.The interior oil sealing that arranges of the front pump housing 45, the endoporus of oil sealing coordinates with eccentric shaft 41, and cylindrical coordinates with the front pump housing 45, and eccentric shaft 41 axle head step place assembling front pad support front bearing, and front bearing is socketed in the axle head of eccentric shaft 41, is positioned at the front pump housing 41; Eccentric shaft 41 contacts end step shaft shoulder face place with the rear pump housing 47 arranges rear pad, rear pad one end face and eccentric shaft 41 shoulder face laminatings, other end and the 47 dome end face laminatings of the rear pump housing; Simultaneously, on eccentric two side shafts of eccentric shaft 41, rear bearing is set respectively, rear bearing coordinates with the front pump housing 45 and the rear pump housing 47 respectively, thereby realizes the cooperation that is connected of eccentric speed reduction mechanism and the front and back pump housing.
Oil inlet 49 is communicated to eccentric speed reduction mechanism, plunger 34 bottoms coordinate with the eccentric excircle of eccentric speed reduction mechanism, piston spring 35 is set in the endoporus of plunger 34, and plug 36 is arranged on middle pump body 46 radial hole ends plunger 34 and piston spring 35 is enclosed in hole, supports plunger 34 and piston spring 35.Outer shaft 43 on eccentric shaft 41 coordinates with plunger 34, realizes the cooperation that is connected with middle pump body 46.The outlet of pump oil subsystem is arranged on the end face of middle pump body 46 and in end face upper outlet position, oil seal piece 37 is set, oil seal piece 37 coordinates in the circular groove 39 that is assemblied in the rear pump housing 47 end faces with disk spring 38, be combined into the tray type structure check valve, circular groove 39 is communicated with the oil outlet 40 on being arranged on the rear pump housing 47, and on the crossing cross section of oil inlet 49 and the eccentric excircle of eccentric shaft 41, thin wall small hole 44 is set, form logical oily check valve.
The present invention's jury pump 31 oil circuit turnover routes used are: oil enters the pump housing from oil inlet 49, then enters the pump oil subsystem by thin wall small hole 44, then from the outlet of pump oil subsystem, through circular groove 39 and oil outlet 40, discharges.
As shown in Figure 5, when eccentric shaft 41 left-hand revolution, plunger 34 is under the effect of eccentric shaft 41 eccentric excircles, four plungers of eccentric shaft 41 eccentric excircle major diameter one sides, 34 sealed volume become large, hydraulic oil is pressed into plunger 34 upper ends by oil seal piece 37 and disk spring 38 under bar pressure, in four plunger 34 sealed volume of eccentric excircle minor diameter one side, diminish, fluid is forced out by oil seal piece 37 and disk spring 38.
As shown in Figure 6, when eccentric shaft 41 clickwise, plunger 34 is under the effect of eccentric shaft 41 eccentric excircles, during four plunger 34(left-hand revolutions of eccentric shaft 41 eccentric excircle major diameter one sides, sealed volume diminishes four) sealed volume becomes large, hydraulic oil is pressed into plunger 34 upper ends by oil seal piece 37 and disk spring 38 under bar pressure, when four plunger 34(left-hand revolutions of opposite side, sealed volume becomes large four) sealed volume diminishes, and fluid is forced out by oil seal piece 37 and disk spring 38.
As shown in Figure 7, a kind of concrete structure for the present invention's guard valve 32 used, at the middle part of valve body 2, horizontal main valve plug 6 is set, main valve plug 6 connects little check valve 25 near an end of the second groove 602 by the first spring 5, spacing main steering pump oil inlet, composition commutation and the control subsystem of connecing of the first collar 13 for another end.The downside of main valve plug 6 arranges large check valve 26, the bottom of large check valve 26 is oil outlet, between little check valve 25 and large check valve 26, path is arranged, need to block the auxiliary hole that machining is used with the first plug 1, coordinate the second seal ring 15 with the second plug 14, block safe valve opening, same, on way to cycle oil, with the 5th plug 7, block the auxiliary hole that machining is used.And, at valve seat one end of little check valve 25, directly connect the 4th plug 4, the four plugs 4 also to play the effect of supporting valve seat, the 4th plug 4 coordinates the first seal rings 3, blocks safe valve opening herein. simultaneously
As shown in Figure 8, main valve plug 6 structural representations for the present invention's guard valve 32 used, open successively spaced the first groove 601 and the second groove 602 perpendicular to its length direction on main valve plug 6 lateral surfaces, the more close main steering pump oil inlet P of the first groove 601, three apertures 603 of conducting to main valve plug 6 inside are arranged on the first groove 601, main valve plug 6 inside arrange minor diameter oil through 604, main valve plug 6 inside are rendered as two chambeies that are communicated with by minor diameter oil through 604, in the present embodiment, what directly be communicated with main steering pump oil inlet P is right chamber, another is left chamber, the diameter of minor diameter oil through 604 is determined by the elasticity of the switching flow of setting and the first spring 5.
As shown in Figure 9, valve body 2 structural representations for the present invention's guard valve 32 used, have the first circular groove 201, the second circular groove 202 and the 3rd circular groove 203 that are parallel to each other in valve body 2, the top of the first circular groove 201 corresponding large check valves 26, the second circular groove 202 connects jury pump oil inlet P 2, the three circular grooves 203 and takes back hydraulic fluid port T.
As shown in figure 10, the large check valve 26 of the present invention's guard valve 32 used comprises back taper spool 17, the first pad 16 and the second pad 22 are set on the conical surface lower plane of back taper spool 17, then be socketed the second spring 21 on conical surface lower outer diameter, on valve seat 20, round bar is arranged, round bar stretches in the basifacial endoporus of back taper spool 17 cone, the second spring 21 coordinates with valve seat 20, make the taper valve core 17 can be along its axially reciprocating, realize opening and closing, the bottom of valve seat 20 sets gradually back-up ring 18 and the second collar 19, to large check valve 26, carries out spacing.Little check valve 25 is basically identical with large check valve 26 structures.
As shown in figure 11; in the oil return inlet T position of guard valve 32 of the present invention, the 3rd plug 11 is set; the 3rd pad 12 is arranged between the 3rd plug 11 and valve body 2; the 3rd plug 11 has endoporus; the 3rd spring 10 wherein is installed; steel ball 8 is installed on steel ball seat 9; steel ball seat 9 bottom design have boss; boss stretches in the hole of the 3rd spring 10 close-fitting of realizing with the 3rd spring 10; the opposite side that is positioned at steel ball 8 on fuel-displaced path arranges pressure sensor 23, on pressure sensor 23, should have distance sleeve 24 to carry out certain protection.In the switching flow situation of setting, if main steering pump is the steering box fuel feeding, steel ball 8 does not contact substantially with pressure sensor 23, if jury pump is the steering box fuel feeding, steel ball 8 applies certain pressure to pressure sensor 23 and makes its work under the screen resilience effect of the 3rd spring 10, and above structure forms the warning subsystem.
The size of above-mentioned the first groove 601, the second groove 602, the first circular groove 201, the second circular groove 202 and the 3rd circular groove 203 meets: when the first spring 5 compressed, the second circular groove 202, the second groove 602 and the 3rd circular groove 203 form the conducting chamber, and the first circular groove 201 and the first groove 601 form the conducting chamber; When the first spring 5 is normal condition, the second circular groove 202 and the first circular groove 201 form the conducting chamber.
Handoff functionality of the present invention is to move and realize by the commutation of main valve plug 6, according to concrete applying working condition, mainly contains following mode of operation:
(1) main steering pump 28 normal operations, main valve plug 6 is operated in the first compressed position of spring 5, the oily oil sump tank of jury pump 31;
When main steering pump 28 is working properly, hydraulic oil enters left chamber by the right chamber of main valve plug 6 by middle minor diameter oil through 604, pushes little check valve 25 open and leads to oil outlet A, enters steering box, makes steering swivel system work.Its principle is: due to the minor diameter oil through 604 in the middle of main valve plug 6, poor at minor diameter oil through 604 both sides mineralization pressures according to the orifice restriction principle.Main steering pump 28 flows are greater than the switching flow of setting, the right chamber of main valve plug 6 hydraulic coupling is greater than left chamber one end the first spring 5 thrusts, main valve plug 6 is pulled to left position, the first spring 5 is compressed, a large amount of main steering pump oil-feeds enter into the conducting chamber of the first circular groove 201 and the first groove 601 formation through aperture 604, and then flow to oil outlet through large check valve 26.The jury pump oil-feed enters into the conducting chamber that the second circular groove 202, the second groove 602 and the 3rd circular groove 203 form, and directly by return opening, is returned.
Now main steering pump hydraulic oil is supplied with steering box, the direct oil sump tank of jury pump hydraulic oil, and jury pump hydraulic oil is pushed steel ball 8 open, and pressure sensor 23 does not collect pressure signal, and the fault-indicating lamp of connection extinguishes.In Figure 12 dotted line frame, be the hydraulic schematic diagram of the present invention at this control position.
(2) main steering pump 28 is not worked (losing efficacy or engine off), and main valve plug 6 is operated in position, right chamber, jury pump 31 work.
When main steering pump 28 damages or flow is less than the switching flow of setting fully, the right chamber of main valve plug 6 hydraulic coupling is less than left chamber one end the first spring 5 thrusts, main valve plug 6 is pulled to right position, the first spring 5 recovers, the main steering pump oil-feed of trace, outside aperture 604 enters into the first groove 601, is closed and can not outflows.The jury pump oil-feed enters into the conducting chamber of the second circular groove 202 and the first circular groove 201 formation, and then flows to oil outlet A through large check valve 26.
Now oil return line is without fluid, and steel ball 8 withstands on pressure sensor 23 guide rods under the elastic force power effect of the 3rd spring 10, and alarm loop is connected, and fault-indicating lamp is reported to the police, and points out main steering pump 28 to break down.In Figure 13 dotted line frame, be the hydraulic schematic diagram of the present invention at this control position.
Thus, realize main steering pump 28 and the automatic switchover of jury pump 31 to steering box 33 fuel feeding, guaranteed emergent steering swivel system in the situation that driving engine breaks down and guaranteed that traveling vehicle possesses steering capability, at utmost improved the safety performance of vehicle.

Claims (7)

1. an emergency double loop steering boost system, comprise main oil tank (29), main oil tank (29) is communicated with steering box (33) by main steering pump (28) and steering actuation cylinder (27) formation turns to main system, also comprise secondary oil tank (30), secondary oil tank (30) is communicated with steering box (33) by jury pump (31) and guard valve (32) and steering actuation cylinder (27) formation turns to calibration package, main pump oil inlet (P) is arranged on described guard valve (32), jury pump oil inlet (P2), return opening (T) and oil outlet (A), main pump oil inlet (P) connects the outlet of main steering pump (28), jury pump oil inlet (P2) connects the outlet of jury pump (31), return opening (T) tieback is to secondary oil tank (30), oil outlet (A) connects steering box (33), it is characterized in that, described jury pump (31) comprises the front pump housing (45) be connected successively with eccentric speed reduction mechanism, middle pump body (46) and the rear pump housing (47), the upper oil inlet (49) that is communicated to eccentric speed reduction mechanism that arranges of the rear pump housing (47), a plurality of radial holes (48) are arranged on described middle pump body (46), a plunger (34) is set respectively in each radial hole (48) and forms the pump oil subsystem, plunger (34) bottom coordinates with the eccentric excircle of eccentric speed reduction mechanism, piston spring (35) is set in the endoporus of plunger (34), plug (36) is arranged on radial hole (48) end plunger (34) and piston spring (35) is enclosed in hole, the outlet of described pump oil subsystem is arranged on the end face of middle pump body (46) and in end face upper outlet position, oil seal piece (37) is set, oil seal piece (37) coordinates in the circular groove (39) that is assemblied in the rear pump housing (47) end face with disk spring (38), circular groove (39) is communicated with the oil outlet (40) on being arranged on the rear pump housing (47).
2. emergency according to claim 1 double loop steering boost system, it is characterized in that, described eccentric speed reduction mechanism comprises eccentric shaft (41), assemble lining (42) on the eccentric excircle of eccentric shaft (41), the exterior outer shaft of lining (42) (43), described outer shaft (43) coordinates with middle pump body (46) and plunger (34).
3. emergency according to claim 2 double loop steering boost system, is characterized in that, the eccentric excircle of described oil inlet (49) and eccentric shaft (41) arranges thin wall small hole (44) on crossing cross section, forms logical oily check valve.
4. emergency according to claim 1 double loop steering boost system, it is characterized in that, described guard valve (32) comprises valve body (2), the middle part of valve body (2) arranges horizontal main valve plug (6), open successively spaced the first groove (601) and the second groove (602) perpendicular to its length direction on main valve plug (6) lateral surface, conducting is arranged to the inner aperture (603) of main valve plug (6) on the first groove (601), main valve plug (6) connects little check valve (25) near an end of the second groove (602) by the first spring (5), the other end is main pump oil inlet (P), the downside of main valve plug (6) arranges large check valve (26), the bottom of large check valve (26) is oil outlet, between little check valve (25) and large check valve (26), path is arranged, have first circular groove (201) coaxial with main valve plug (6) in valve body (2), the second circular groove (202) and the 3rd circular groove (203), the top of the corresponding large check valve (26) of the first circular groove (201), the second circular groove (202) connects the jury pump oil inlet, the 3rd circular groove (203) takes back hydraulic fluid port, described the first groove (601), the second groove (602), the first circular groove (201), the size of the second circular groove (202) and the 3rd circular groove (203) meets: when the first spring (5) compressed, the second circular groove (202), the second groove (602) and the 3rd circular groove (203) form the conducting chamber, the first circular groove (201) forms the conducting chamber with the first groove (601), when the first spring (5) is normal condition, the second circular groove (202) forms the conducting chamber with the first circular groove (201).
5. emergency according to claim 4 double loop steering boost system, it is characterized in that, described main valve plug (6) inside arranges minor diameter oil through (604), and the diameter of minor diameter oil through (604) is determined by the elasticity of the switching flow of setting and the first spring (5).
6. emergency according to claim 4 double loop steering boost system, is characterized in that, described aperture (603) has three, evenly is arranged on same cross section.
7. emergency according to claim 4 double loop steering boost system, it is characterized in that, described large check valve (26) comprises back taper spool (17), is socketed with the second spring (21) coordinated with its valve seat (20) on the conical surface lower outer diameter of back taper spool (17).
CN 201210176375 2012-05-31 2012-05-31 Emergency two-circuit power steering system CN102700603B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 201210176375 CN102700603B (en) 2012-05-31 2012-05-31 Emergency two-circuit power steering system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 201210176375 CN102700603B (en) 2012-05-31 2012-05-31 Emergency two-circuit power steering system

Publications (2)

Publication Number Publication Date
CN102700603A CN102700603A (en) 2012-10-03
CN102700603B true CN102700603B (en) 2013-12-25

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Application Number Title Priority Date Filing Date
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Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102975767A (en) * 2012-12-17 2013-03-20 沙市久隆汽车动力转向器有限公司 Switching valve for double-circuit assisted steering gear
CN103742401A (en) * 2014-01-07 2014-04-23 南通环球转向器制造有限公司 Emergency pump
CN105346595B (en) * 2015-12-04 2018-01-30 广西玉柴机器股份有限公司 Steering
CN107628103B (en) * 2017-08-17 2019-10-18 北京福田戴姆勒汽车有限公司 Test method, system and the vehicle of double loop hydraulic booster steering system
CN107554602B (en) * 2017-08-17 2020-04-28 北京福田戴姆勒汽车有限公司 Emergency type double-loop hydraulic power-assisted steering system, vehicle and method

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2731975C3 (en) * 1977-07-15 1980-08-28 Zahnradfabrik Friedrichshafen Ag, 7990 Friedrichshafen
JP3926942B2 (en) * 1999-02-24 2007-06-06 ユニシア ジェーケーシー ステアリングシステム株式会社 Power steering device
CN2900287Y (en) * 2006-05-09 2007-05-16 重庆大江工业(集团)有限责任公司 Oil path distribution valve for automobile power steering
CN201849525U (en) * 2010-10-15 2011-06-01 北京京城重工机械有限责任公司 Emergency steering system of vehicle
CN202669911U (en) * 2012-05-31 2013-01-16 陕西秦川机械发展股份有限公司 Novel emergency double-loop steering booster system

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