CN103419842A - Front axle and rear axle steering system utilizing numerical control speed changer to conduct mechanical transmission for a rear axle - Google Patents
Front axle and rear axle steering system utilizing numerical control speed changer to conduct mechanical transmission for a rear axle Download PDFInfo
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- CN103419842A CN103419842A CN2012101577820A CN201210157782A CN103419842A CN 103419842 A CN103419842 A CN 103419842A CN 2012101577820 A CN2012101577820 A CN 2012101577820A CN 201210157782 A CN201210157782 A CN 201210157782A CN 103419842 A CN103419842 A CN 103419842A
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Abstract
The invention relates to a front axle and rear axle steering system utilizing a numerical control speed changer to conduct mechanical transmission for a rear axle. According to the front axle and rear axle steering system, a steering transmission transfer case transmits steering movements input by a steering control and a steering column to a front steering transmission shaft and a rear steering transmission shaft in proportion respectively, the front steering transmission shaft drives a front drop arm and a front steering drag link to drive a front steering wheel through a front axle power steering box, and the rear steering transmission shaft transmits the steering movements to a rear axle power steering box after the speed of the rear steering transmission shaft is changed by the numerical control speed changer to drive a rear drop arm to drive a rear steering drag link to drive a rear steering wheel to conduct steering. According to the technical scheme, the defects that the steering angle between a front axle and a rear axle of a vehicle which achieves multi-axle steering in an original mechanical transmission mode can only be kept within a certain proportion, and the proportion of the steering angle can not be changed along with the change of vehicle speed are overcome, and the proportion of the steering angle of the front axle and the rear axle of the vehicle which achieves multi-axle steering in the mechanical transmission mode can be changed along with the change of the vehicle speed. Therefore, both maneuverability in the low-speed driving process and operation stability in the high-speed driving process can be improved.
Description
Technical field
The present invention relates to a kind of automobile steering system, particularly relate to the front-rear axle steering swivel system of a kind of back axle by numerical control change-speed box mechanical transfer.
Background technology
Multi-axle automobile in the prior art is in order to improve its manoevreability, reduce wear on tyres when reducing the automobile turning radius, normally adopt multi-axle steering, generally that the first bridge is called to the active steering bridge, turning to by steering box of active steering bridge directly drives, and the divertical motion of driven steeraxle can be realized by mechanical drive mode, also can realize by hydraulic transmission mode or mode of electric drive, wherein mechanical drive mode gains great popularity because it is intuitive and reliable, but the existing machinery type of drive is transferred to the ratio of turning of back axle and is and immobilizes, accomplishing at most of having reaching certain speed of a motor vehicle, can make back axle not turn to.And can not progressively reduce to be transferred to along with the raising of the speed of a motor vehicle ratio of turning of back axle, more can not make rear steering crop rotation and controlled the turning to of front-wheel direction same degree, though realize that by mechanical drive mode the vehicle of multi-axle steering has improved the manoevreability of low speed driving, may reduce the handling stability of running at high speed thereby make to adopt.
Summary of the invention
In view of this, the technical problem to be solved in the present invention is to provide the front-rear axle steering swivel system of a kind of back axle by numerical control change-speed box mechanical transfer, pass through the technical program, the mode that adopts jackshaft not turn on center axle at three bridge automobiles, and can be transferred to back axle to the divertical motion of propons in different ratios according to the different speed of a motor vehicle, wheel flutter counterturn before and after can making when low speed, and the relative front wheel steering angle of rear steering wheel deflection angle has larger proportion, reduce minimum turning radius thereby reach, improve manoevreability, reduce wear on tyres simultaneously; Need progressively reduce to be transferred to along with the raising of the speed of a motor vehicle ratio of turning of back axle for improving handling stability, when height arrives certain speed of a motor vehicle, can make the rear steering wheel not turn to, even allow rear steering crop rotation and controlled the turning to of front-wheel direction same degree, thereby, under the various speed of a motor vehicle, realize stability, alerting ability and the manoevreability of automobile.
For solving the problems of the technologies described above, technical scheme of the present invention is achieved in that the front-rear axle steering swivel system of a kind of back axle by numerical control change-speed box mechanical transfer, its front-rear axle steering swivel system adopts and turns to the transmission auxiliary gear box by bearing circle, the divertical motion of steering column input passes to respectively front steering transmission shaft and rear steering transmission shaft in proportion, the front steering transmission shaft drives front steering plumbing arm and front steering drag link driving steering front wheel through the propons power steer, the rear steering transmission shaft is passed to the back axle power steer and is driven the rear steering plumbing arm and drive the rear steering drag link to drive the rear steering wheel to turn to after the numerical control speed changer.
Described numerical control change-speed box consists of planetary transmission and control setup, be provided with two groups of identical input planet rows of parameter and output planetary row in planetary transmission, being fixed with respectively input shaft in the middle of the sun wheel of two planet rows stretches out with the rear steering transmission shaft and is connected from the planetary transmission two ends with output shaft, the upper shared pinion carrier of described input planet row and output planetary row, satellite gear on described input planet row and output planetary row is coaxial in twos, described satellite gear is sleeved on pinion carrier, output internally toothed annulus on described output planetary row is fixed on casing, be fixedly installed a worm gear on the input internally toothed annulus of input planet row, with the worm screw of worm gear engagement, with stepping motor, be connected.The running of stepping motor is controlled by control setup.
Described control setup consists of ECU (Electrical Control Unit), car speed sensor, tachogen, described tachogen is arranged on input shaft and detects the input shaft rotating speed, described tachogen, car speed sensor and stepping motor are connected with ECU (Electrical Control Unit) respectively, described tachogen, car speed sensor flow to ECU (Electrical Control Unit) to digital signal, through the ECU (Electrical Control Unit) computing, the output control signal is to its running of step motor control.
Described rear steering transmission shaft is composed in series by some sections universal coupling transmission shafts, and can arrange installation according to the structure space of each parts of car load.
The technique effect that the present invention reaches is as follows: the front-rear axle steering swivel system of numerical control change-speed box mechanical transfer for a kind of back axle, pass through the technical program, changed and originally by mechanical drive mode, realized that the vehicle front-rear axle deflection angle of multi-axle steering can only keep certain ratio, and can not change with the speed of a motor vehicle reality of deflection angle ratio, make by mechanical drive mode and realize that its front-rear axle deflection angle ratio of vehicle of multi-axle steering can change with the speed of a motor vehicle.Thereby both can improve the manoevreability of low speed driving, can improve the handling stability of running at high speed again.
The accompanying drawing explanation
Fig. 1 is wheel flutter counter steering motion structure schematic diagram before and after the present invention.
Fig. 2 is front-rear axle steering hardware transmission system structural representation of the present invention.
Fig. 3 is rear-axle steering numerical control change-speed box schematic diagram of the present invention.
Fig. 4 is planetary transmission schematic diagram of the present invention.
The sectional structure schematic diagram that Fig. 5 is planetary transmission of the present invention.
In figure, 1 steering front wheel, 2 front steering plumbing arms, 3 propons power steers, 4 front steering transmission shafts, 5 turn to the transmission auxiliary gear box, 6 front steering drag links, 7 steering columns, 8 bearing circle, 9 universal couplings, 10 rear steering transmission shafts, 11 jackshaft wheels, 12 back axle power steers, 13 rear-axle steering drag links, 14 rear steering plumbing arms, 15 rear steering wheels, 16 stepping motors, 17 casings, 18 planetary transmissions, 19 worm screws, 20 ECU (Electrical Control Unit), 22 input internally toothed annuluss, 23 input shafts, 24 output internally toothed annuluss, 25 satellite gears, 26 output shafts, 27 pinion carriers, 28 worm gears, 29 sun wheels, 30 tachogens, 31 car speed sensors.
The specific embodiment
Below in conjunction with the drawings and specific embodiments, the present invention will be further described.
As Figure 1-Figure 5, the front-rear axle steering swivel system of numerical control change-speed box mechanical transfer for the back axle the present invention relates to, its front-rear axle steering swivel system adopts and turns to transmission auxiliary gear box 5 by bearing circle 8, the divertical motion of steering column 7 inputs passes to respectively front steering transmission shaft 4 and rear steering transmission shaft 10 in proportion, front steering transmission shaft 4 drives front steering plumbing arm 2 and front steering drag link 6 driving steering front wheeles 1 through propons power steer 3, passing to back axle power steer 12 in the middle of described rear steering transmission shaft 10 after rear-axle steering numerical control planetary transmission 18 speed changes drives rear steering plumbing arms 14 and drives rear steering drag links 13 to drive rear steering wheel 15 to turn to.
Described back axle is to consist of planetary transmission 18 and control setup with the numerical control change-speed box, be provided with two groups of identical input planet rows of parameter and output planetary row in described planetary transmission 18, in the middle of planetary transmission 18, two ends are respectively arranged with input shaft 23 and output shaft 26, be fixedly installed respectively sun wheel 29 on input shaft 23 and output shaft 26, the upper shared pinion carrier 27 of described input planet row and output planetary row, satellite gear 25 on described input planet row and output planetary row is coaxial in twos, described satellite gear 25 is sleeved on pinion carrier 27, output internally toothed annulus 24 on described output planetary row is fixed on casing 17, be fixedly installed a worm gear 28 on the input internally toothed annulus 22 of input planet row, with the worm screw 19 of worm gear 28 engagements, with stepping motor 16, be connected.
Described control setup consists of ECU (Electrical Control Unit) 20, car speed sensor 31, tachogen 30, described tachogen 30 is arranged on input shaft 23 and detects the input shaft rotating speed, described tachogen 30, car speed sensor 31 and stepping motor 16 are connected with ECU (Electrical Control Unit) 20 respectively, described tachogen 30, car speed sensor 31 flow to ECU (Electrical Control Unit) 20 to digital signal, through ECU (Electrical Control Unit) 20 computings, the output control signal is controlled its running to stepping motor 16.
Described rear steering transmission shaft 10 is composed in series by some sections universal couplings 9 transmission shafts, and can arrange installation according to the structure space of each parts of car load.
Technical scheme of the present invention is when application, when vehicle low speed turning driving, described ECU (Electrical Control Unit) 20 is not rotated according to Digital Signals stepping motor 16 and the worm screw 19 of car speed sensor 31, the input internally toothed annulus 22 of worm gear 28 and input planet row does not rotate with respect to casing 17 is also fixing, at this moment be equivalent to, the input internally toothed annulus 22 of two planet rows and output internally toothed annulus 24 are all fixing with respect to casing 17, two planet rows share again a pinion carrier 27, therefore be fixed in input shaft 23 and the certain synchronized rotation of output shaft 26 in the sun wheel 29 of two planet rows, at this moment planetary transmission 18 transmission speed ratios are 1, suitably selecting to turn to the transfer speed ratio of transmission auxiliary gear box 5, the size of front steering plumbing arm 2, the size of rear steering plumbing arm 14 and the steering trapezium of front-rear axle, in the time of can guaranteeing vehicle low speed turning driving, meet the opposite direction of steering front wheel and rear steering wheel, each wheel Instantaneous center all converges to a bit on jackshaft axis extended line, as shown in Figure 1.At this moment not only turn radius is little, and manoevreability is high, and the equal pure rolling of each wheel, without the side direction sliding wear, has reduced wear on tyres.
After Vehicle Speed is brought up to a certain velocity amplitude, when being turned to, steering front wheel 1 and rear steering are taken turns 15 switched in opposite, now the deflection angle of larger rear steering wheel 15 can make the trend of the understeering of vehicle reduce, the trend of oversteer increases, thereby make the handling stability off-target value of vehicle, at this moment, the digital signal of the tachogen 30 of automatically controlled electricity unit's 20 digital signals according to car speed sensor 31 and input shaft 23 is sent instruction control step motor 16 through the calculating of ECU (Electrical Control Unit) 20, make worm screw 19 rotarily drive worm gear 28 and input shaft 23 contrarotations, thereby pinion carrier 27 rotating speeds are slowed down, and then output shaft 26 rotating speeds are slowed down, planetary transmission 18 transmission speed ratio<1, the ratio of the deflection angle of the relative steering front wheel 1 of deflection angle of rear steering wheel 15 is corresponding diminishing also, this will make the trend of the understeering of vehicle increase, the trend of oversteer reduces, thereby make the handling stability of vehicle get back to optimum value.
Further raising along with Vehicle Speed, ECU (Electrical Control Unit) 20 control step motors 16 make worm screw 19 rotarily drive worm gear 28 and input shaft 23 contrarotation speed raisings, so that make pinion carrier 27 rotating speeds slow to zero, and then make output shaft 26 rotating speeds slow to zero, at this moment planetary transmission 18 transmission speed ratios are 0, rear steering wheel 15 ratios of the deflection angle with respect to steering front wheel 1 are zero, no matter how steering front wheel 1 turns to, rear steering wheel 15 is not turned to, back axle has now become non-steering axle, thereby makes the handling stability of vehicle get back to optimum value.
After raising of Vehicle Speed is higher, it is higher with input shaft 23 contrarotation speed that ECU (Electrical Control Unit) 20 control step motors 16 make worm screw 19 rotarily drive worm gear 28, so that pinion carrier 27 is become and input shaft 23 contrarotations, and then make output shaft 26 also with input shaft 23 contrarotations, at this moment planetary transmission 18 transmits speed ratio<0, rear steering wheel 15 produces turning in the same way of certain ratio with respect to steering front wheel, thereby makes the handling stability of vehicle get back to optimum value.
As mentioned above after rear-axle steering numerical control planetary transmission 18 is set, just provide technical measures to make the rear-axle steering of vehicle all the time in rational optimum regime, wheel flutter counterturn before and after making during the low speed turning driving, each wheel Instantaneous center all converges to a bit on jackshaft axis extended line, not only turn radius is little for this, and manoevreability is high, and the equal pure rolling of each wheel, without the side direction sliding wear, reduced wear on tyres.After Vehicle Speed is brought up to a certain value, the numerical control change-speed box can reduce to transmit corresponding the diminishing of ratio that speed ratio makes the relative front wheel steering angle of rear steering wheel deflection angle according to the speed of a motor vehicle.This will make the trend of the understeering of vehicle increase, and the trend of oversteer reduces, thereby makes the handling stability of vehicle get back to optimum value.After raising of Vehicle Speed is higher, the numerical control change-speed box can reduce to transmit speed ratio according to the speed of a motor vehicle and very cause as negative to zero, thereby the ratio that makes the relative front wheel steering angle of rear steering wheel deflection angle is zero very causing as negative, at this moment back axle has become non-steering axle, perhaps the rear steering wheel produces turning in the same way of certain ratio with respect to front-wheel, thereby makes the handling stability of vehicle get back to optimum value.
In the present invention, described rear steering transmission shaft 10 is composed in series by some sections universal couplings 9 and rear steering transmission shaft 10, can carry out arrangement according to the structure space of each parts of car load.Turn round power-assisted and just be used for overcoming the rear-axle steering resistance because transmitted divertical motion also will slow down to increase through back axle power steer 12, therefore the divertical motion moment of torsion that rear steering transmission shaft 10 and numerical control planetary transmission 18 transmit is all little, rear steering transmission shaft 10 torsional deflectioies and the driven hysteresis phenomenon that turns to that causes is also little.
The above, be only preferred embodiment of the present invention, is not intended to limit protection scope of the present invention.
Claims (4)
1. the front-rear axle steering swivel system of numerical control change-speed box mechanical transfer for a back axle, its front-rear axle steering swivel system adopts and turns to the transmission auxiliary gear box by bearing circle, the divertical motion of steering column input passes to respectively front steering transmission shaft and rear steering transmission shaft in proportion, the front steering transmission shaft drives front steering plumbing arm and front steering drag link driving steering front wheel through the propons power steer, the rear steering transmission shaft is passed to the back axle power steer and is driven the rear steering plumbing arm and drive the rear steering drag link to drive the rear steering wheel to turn to after the numerical control speed changer, and can need to adjust the deflection angle of rear steering wheel according to driving cycle.
2. the front-rear axle steering swivel system of numerical control change-speed box mechanical transfer for back axle according to claim 1, it is characterized in that, described numerical control change-speed box consists of planetary transmission and control setup, be provided with two groups of identical input planet rows of parameter and output planetary row in described planetary transmission, being fixed with respectively input shaft in the middle of the sun wheel of two planet rows stretches out with the rear steering transmission shaft and is connected from the planetary transmission two ends with output shaft, the upper shared pinion carrier of described input planet row and output planetary row, satellite gear on described input planet row and output planetary row is coaxial in twos, described satellite gear is sleeved on pinion carrier, output internally toothed annulus on described output planetary row is fixed on casing, be fixedly installed a worm gear on the input internally toothed annulus of input planet row, with the worm screw of worm gear engagement, with stepping motor, be connected.
3. the front-rear axle steering swivel system of numerical control change-speed box mechanical transfer for back axle according to claim 2, it is characterized in that, described control setup consists of ECU (Electrical Control Unit), car speed sensor, tachogen, described tachogen is arranged on input shaft and detects the input shaft rotating speed, described tachogen, car speed sensor and stepping motor are connected with ECU (Electrical Control Unit) respectively, described tachogen, car speed sensor flow to ECU (Electrical Control Unit) to digital signal, through the ECU (Electrical Control Unit) computing, the output control signal is to its running of step motor control.
4. the front-rear axle steering swivel system of numerical control change-speed box mechanical transfer for back axle according to claim 1, it is characterized in that, described rear steering transmission shaft is composed in series by some sections universal coupling transmission shafts, and can arrange installation according to the structure space of each parts of car load.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101577820A CN103419842A (en) | 2012-05-21 | 2012-05-21 | Front axle and rear axle steering system utilizing numerical control speed changer to conduct mechanical transmission for a rear axle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101577820A CN103419842A (en) | 2012-05-21 | 2012-05-21 | Front axle and rear axle steering system utilizing numerical control speed changer to conduct mechanical transmission for a rear axle |
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| Publication Number | Publication Date |
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| CN103419842A true CN103419842A (en) | 2013-12-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012101577820A Pending CN103419842A (en) | 2012-05-21 | 2012-05-21 | Front axle and rear axle steering system utilizing numerical control speed changer to conduct mechanical transmission for a rear axle |
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| CN (1) | CN103419842A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104477233A (en) * | 2014-12-17 | 2015-04-01 | 朱恒 | Intelligent steering system of four-wheel automobile |
| CN106741134A (en) * | 2016-12-05 | 2017-05-31 | 徐州重型机械有限公司 | For the active front steering system and hoisting machinery of hoisting machinery |
| CN111017012A (en) * | 2019-12-31 | 2020-04-17 | 泰安航天特种车有限公司 | Electric control hydraulic vehicle steering system and debugging method |
| CN114735108A (en) * | 2022-04-29 | 2022-07-12 | 浙江航天润博测控技术有限公司 | Six-wheel chassis structure with Ackerman steering and pivot steering and method |
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| CN102152808A (en) * | 2011-03-07 | 2011-08-17 | 武汉欧塔科汽车设计研究院有限公司 | Front and rear axle steering system for numerical control mechanical transmission |
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2012
- 2012-05-21 CN CN2012101577820A patent/CN103419842A/en active Pending
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| JPH03125671A (en) * | 1989-10-09 | 1991-05-29 | Koyo Seiko Co Ltd | Four-wheel steering device of vehicle |
| US5839527A (en) * | 1994-04-22 | 1998-11-24 | Zf Friedrichshafen Ag. | Multi-axle steering system for vehicles |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104477233A (en) * | 2014-12-17 | 2015-04-01 | 朱恒 | Intelligent steering system of four-wheel automobile |
| CN106741134A (en) * | 2016-12-05 | 2017-05-31 | 徐州重型机械有限公司 | For the active front steering system and hoisting machinery of hoisting machinery |
| CN106741134B (en) * | 2016-12-05 | 2019-10-25 | 徐州重型机械有限公司 | Active front steering system and hoisting machinery for hoisting machinery |
| CN111017012A (en) * | 2019-12-31 | 2020-04-17 | 泰安航天特种车有限公司 | Electric control hydraulic vehicle steering system and debugging method |
| CN114735108A (en) * | 2022-04-29 | 2022-07-12 | 浙江航天润博测控技术有限公司 | Six-wheel chassis structure with Ackerman steering and pivot steering and method |
| CN114735108B (en) * | 2022-04-29 | 2023-02-28 | 浙江航天润博测控技术有限公司 | Six-wheel chassis structure with Ackerman steering and pivot steering and method |
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Application publication date: 20131204 |