CN104960568A - Rear wheel steering and returning mechanism for commercial vehicle - Google Patents
Rear wheel steering and returning mechanism for commercial vehicle Download PDFInfo
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- CN104960568A CN104960568A CN201510398458.1A CN201510398458A CN104960568A CN 104960568 A CN104960568 A CN 104960568A CN 201510398458 A CN201510398458 A CN 201510398458A CN 104960568 A CN104960568 A CN 104960568A
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Abstract
The invention discloses a rear wheel steering and returning mechanism for a commercial vehicle. The rear wheel steering and returning mechanism comprises a hydraulic returning cylinder as well as a motor, a rear wheel steering gear, a steering rocker arm and a rear wheel steering pull rod, wherein the motor, the rear wheel steering gear, the steering rocker arm and the rear wheel steering pull rod are connected with each other in sequence; the motor and the rear wheel steering gear are both fixed on a frame cross beam; an upper steering knuckle arm of a rear wheel steering driving axle is connected with a rear wheel steering pull rod so as to drive the rear wheel to steer; and a lower steering knuckle arm of the rear wheel steering driving axle is connected with a piston rod of the hydraulic returning cylinder so as to drive the rear wheel to return. According to the rear wheel steering and returning mechanism for the commercial vehicle, disclosed by the invention, the steering and returning functions of a rear wheel are realized on the one hand and the stability in driving and stability in operation are assured on the other hand through the coordination between the hydraulic returning cylinder and the motor. In addition, the rear wheel steering and returning mechanism for the commercial vehicle, disclosed by the invention, is advantaged in that the structure is simple, the alteration of a chassis structure is small, the response speed is high, the control difficulty is small and the requirements on the operation of a driver are reduced.
Description
Technical field
The present invention relates to vehicle structure technical field, particularly relate to a kind of rear-axle steering centering mechanism for commercial vehicle/comm..vehicle.
Background technology
At present, steering reversal mechanism in the rear-wheel steering system that car and Light-duty Vehicle use also is not suitable for commercial vehicle/comm..vehicle, reason is that the rear axle axle load of commercial vehicle/comm..vehicle is larger, in the traveling and steering procedure of vehicle, wheel can be subject to very large side force, the deflection that easy generation is unnecessary, causes riding stability and the road-holding property degradation of vehicle.Therefore, the steering reversal mechanism significant discomfort of light-duty vehicle is used and commercial vehicle/comm..vehicle.
Summary of the invention
Main purpose of the present invention is to provide a kind of rear-axle steering centering mechanism for commercial vehicle/comm..vehicle, is intended to realize commercial vehicle/comm..vehicle rear-axle steering function simultaneously, ensures its riding stability and road-holding property.
For achieving the above object, the invention provides a kind of rear-axle steering centering mechanism for commercial vehicle/comm..vehicle, comprise hydraulic pressure and return positive cylinder and the motor connected successively, rear-axle steering device, pitman arm and rear-axle steering pull bar, described motor and rear-axle steering device are all fixed on cross member of frame, the upper track arm of rear-axle steering drive axle is connected to drive rear-axle steering with described rear-axle steering pull bar, and the piston rod that lower track arm and the described hydraulic pressure of rear-axle steering drive axle return positive cylinder is connected just driving rear samsara; When rear-axle steering, described driven by motor rear-axle steering device, by pitman arm and rear-axle steering pull bar, makes the upper track arm of rear-axle steering drive axle promote rear-axle steering; When after samsara timing, the piston rod that described hydraulic pressure returns positive cylinder drives described lower track arm to rotate thus samsara is being just after promoting.
Preferably, described rear-axle steering device is connected with described motor by universal-joint.
Preferably, described motor is servomotor.
Preferably, the cylinder body that described hydraulic pressure returns positive cylinder is connected with fixed support by ball end, and described fixed support is fixed on the rear axle housing body of rear-axle steering drive axle by pad and bolt.
Preferably, the two ends of described rear-axle steering pull bar connect described upper track arm and rear steering rocking arm respectively by ball end.
The rear-axle steering centering mechanism that the present invention proposes, by arrange hydraulic pressure return positive cylinder and motor with the use of, achieve rear-axle steering and return function on the one hand, ensure its riding stability and road-holding property on the other hand.In addition, because the steering hardware of physical construction formula pure in prior art exists complex structure, very large problem is changed to whole vehicle frame and chassis structure, and the steering structure of pure fluid pressure type completes four-wheel steering by hydraulic control cylinder stroke, there is control difficulty large, mechanism's speed of response is slow, and the problem of driver's operation complexity, and this rear-axle steering centering mechanism structure is simple, hydraulic booster is added by motorized motions, driven by motor rear-axle steering device, rear-axle steering device passes through hydraulic booster, promote rear-axle steering mechanism again, it is little to the change of chassis structure, also there is fast response time simultaneously, control the advantage that difficulty is little, reduce the operation requirements to chaufeur.
Accompanying drawing explanation
What Fig. 1 was the present invention for the rear-axle steering centering mechanism preferred embodiment of commercial vehicle/comm..vehicle faces structural representation;
Fig. 2 is the backsight structural representation of the present invention for the rear-axle steering centering mechanism preferred embodiment of commercial vehicle/comm..vehicle.
In figure, 1-hydraulic pressure returns positive cylinder, 2-fixed support, 3-rear axle housing body, the upper track arm of 4-, track arm under 5-, 6-rear-axle steering pull bar, 7-motor, 8-rear-axle steering device, 9-cross member of frame, 10-pitman arm, 11-rear steering intermediate rod, 12-tie rod arm, 13-bolt.
The realization of the object of the invention, functional characteristics and advantage will in conjunction with the embodiments, are described further with reference to accompanying drawing.
Detailed description of the invention
Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
It should be noted that, in describing the invention, term " transverse direction ", " longitudinal direction ", " on ", D score, "front", "rear", "left", "right", " vertically ", " level ", " top ", " end ", " interior ", the orientation of the instruction such as " outward " or position relationship be based on orientation shown in the drawings or position relationship, only the present invention for convenience of description and simplified characterization, be not indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore can not be interpreted as limitation of the present invention.In addition, term " first ", " second " etc. only for describing object, and can not be interpreted as instruction or hint relative importance.
See figures.1.and.2, in this preferred embodiment, for the rear-axle steering centering mechanism of commercial vehicle/comm..vehicle, comprise hydraulic pressure and return positive cylinder 1 and the motor 7 connected successively, rear-axle steering device 8, pitman arm 10 and rear-axle steering pull bar 6, motor 7 and rear-axle steering device 8 are all fixed on cross member of frame 9, the upper track arm 4 of rear-axle steering drive axle is connected to drive rear-axle steering with rear-axle steering pull bar 6, and the piston rod that lower track arm 5 and the hydraulic pressure of rear-axle steering drive axle return positive cylinder 1 is connected just driving rear samsara; When rear-axle steering, motor 7 drives rear-axle steering device 8, by pitman arm 10 and rear-axle steering pull bar 6, makes the upper track arm 4 of rear-axle steering drive axle promote rear-axle steering (piston rod that now, hydraulic pressure returns positive cylinder 1 is in servo-actuated state); When after samsara timing, the piston rod that hydraulic pressure returns positive cylinder 1 drives lower track arm 5 to rotate thus just promotes samsara afterwards.
Particularly, in the present embodiment, rear-axle steering device 8 is connected with motor 7 by universal-joint.Motor 7 is servomotor.The cylinder body that hydraulic pressure returns positive cylinder 1 is connected with fixed support 2 by ball end, and fixed support 2 is coordinated by pad and bolt 13(tetra-bolts 13) be fixed on the rear axle housing body 3 of rear-axle steering drive axle.The two ends of rear-axle steering pull bar 6 connect upper track arm 4 and pitman arm 10 respectively by ball end.
Rear-axle steering centering mechanism and rear-axle steering drive axle with the use of, to realize turning to and return function of trailing wheel.Rear-axle steering drive axle comprises back axle pontic, lay respectively at the left steering at back axle pontic two ends joint and right steering joint, two tie rod arms 12 be individually fixed on left steering joint and right steering joint, be individually fixed in the two ends that upper track arm 4 on left steering joint and right steering joint and the upper track arm 4 of lower track arm 5(and lower track arm 5 lay respectively at back axle pontic), and the rear steering intermediate rod 11 of connection two tie rod arms 12; Left steering joint is fixedly connected with to drive it to turn to the wheel hub of two trailing wheels with right steering joint respectively.
The principle of work of this rear-axle steering centering mechanism is as follows: when not needing to use rear-axle steering function or rear-axle steering function to break down, enable alignment function, now high pressure liquid force feed enters hydraulic pressure and returns positive cylinder 1, high pressure liquid force feed promotes internal piston, and then track arm 5 moves under promoting piston rod drive, certain stroke is reached when hydraulic pressure returns positive cylinder 1, namely trailing wheel reaches back positive status, piston rod stop motion, now, rear wheel lock is fixed on Shaft alignment state (now rear-axle steering device 8 and motor 7 are servo-actuated state) by the inside pressurize of returning positive cylinder 1 by hydraulic pressure.Needs use rear-axle steering function time, hydraulic pressure returns the release of positive cylinder 1, and internal hydraulic pressure oil is low-pressure state, now, piston rod can along with trailing wheel left and right turn free-extension (namely piston rod is now in servo-actuated state).Meanwhile, after receiving the instruction that chaufeur sends, motor 7 drives rear-axle steering device 8, thus makes pitman arm 10 promote rear-axle steering pull bar 6 and upper track arm 4, and then completes rear-axle steering action.
The rear-axle steering centering mechanism that the present embodiment proposes, by arrange hydraulic pressure return positive cylinder 1 and motor 7 with the use of, achieve rear-axle steering and return function on the one hand, ensure its riding stability and road-holding property on the other hand.In addition, because the four-wheel steering mechanism of physical construction formula pure in prior art exists complex structure, very large problem is changed to whole vehicle frame and chassis structure, and the steering structure of pure fluid pressure type completes four-wheel steering by hydraulic control cylinder stroke, there is control difficulty large, mechanism's speed of response is slow, and the problem of driver's operation complexity, and this rear-axle steering centering mechanism structure is simple, hydraulic booster is added by motorized motions, motor 7 drives rear-axle steering device 8, rear-axle steering device 8 passes through hydraulic booster, promote rear-axle steering mechanism again, it is little to the change of chassis structure, also there is fast response time simultaneously, control the advantage that difficulty is little, reduce the operation requirements to chaufeur.
These are only the preferred embodiments of the present invention; not thereby the scope of the claims of the present invention is limited; every equivalent structure transformation utilizing specification sheets of the present invention and accompanying drawing content to do, or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (5)
1. the rear-axle steering centering mechanism for commercial vehicle/comm..vehicle, it is characterized in that, comprise hydraulic pressure and return positive cylinder and the motor connected successively, rear-axle steering device, pitman arm and rear-axle steering pull bar, described motor and rear-axle steering device are all fixed on cross member of frame, the upper track arm of rear-axle steering drive axle is connected to drive rear-axle steering with described rear-axle steering pull bar, and the piston rod that lower track arm and the described hydraulic pressure of rear-axle steering drive axle return positive cylinder is connected just driving rear samsara; When rear-axle steering, described driven by motor rear-axle steering device, by pitman arm and rear-axle steering pull bar, makes the upper track arm of rear-axle steering drive axle promote rear-axle steering; When after samsara timing, the piston rod that described hydraulic pressure returns positive cylinder drives described lower track arm to rotate thus samsara is being just after promoting.
2., as claimed in claim 1 for the rear-axle steering centering mechanism of commercial vehicle/comm..vehicle, it is characterized in that, described rear-axle steering device is connected with described motor by universal-joint.
3., as claimed in claim 1 for the rear-axle steering centering mechanism of commercial vehicle/comm..vehicle, it is characterized in that, described motor is servomotor.
4. as claimed in claim 1 for the rear-axle steering centering mechanism of commercial vehicle/comm..vehicle, it is characterized in that, the cylinder body that described hydraulic pressure returns positive cylinder is connected with fixed support by ball end, and described fixed support is fixed on the rear axle housing body of rear-axle steering drive axle by pad and bolt.
5. as the rear-axle steering centering mechanism for commercial vehicle/comm..vehicle in Claims 1-4 as described in any one, it is characterized in that, the two ends of described rear-axle steering pull bar connect described upper track arm and pitman arm respectively by ball end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510398458.1A CN104960568A (en) | 2015-07-08 | 2015-07-08 | Rear wheel steering and returning mechanism for commercial vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510398458.1A CN104960568A (en) | 2015-07-08 | 2015-07-08 | Rear wheel steering and returning mechanism for commercial vehicle |
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| CN104960568A true CN104960568A (en) | 2015-10-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510398458.1A Pending CN104960568A (en) | 2015-07-08 | 2015-07-08 | Rear wheel steering and returning mechanism for commercial vehicle |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114872797A (en) * | 2022-05-12 | 2022-08-09 | 中国重汽集团济南动力有限公司 | All-wheel steering snow sweeper all-wheel drive chassis |
| WO2023179455A1 (en) * | 2022-03-25 | 2023-09-28 | 北京车和家汽车科技有限公司 | Vehicle body steering assembly, and vehicle |
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| US20050257987A1 (en) * | 2002-07-05 | 2005-11-24 | Jurgen Bohm | Hydraulic power-assisted steering system |
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| US20030028304A1 (en) * | 2001-08-01 | 2003-02-06 | Klein Steven D. | Method for detecting motor control loss in a power steering system |
| US20050257987A1 (en) * | 2002-07-05 | 2005-11-24 | Jurgen Bohm | Hydraulic power-assisted steering system |
| CN102673637A (en) * | 2012-05-10 | 2012-09-19 | 清华大学 | Electric power-assisted steering system for commercial vehicle |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023179455A1 (en) * | 2022-03-25 | 2023-09-28 | 北京车和家汽车科技有限公司 | Vehicle body steering assembly, and vehicle |
| CN114872797A (en) * | 2022-05-12 | 2022-08-09 | 中国重汽集团济南动力有限公司 | All-wheel steering snow sweeper all-wheel drive chassis |
| CN114872797B (en) * | 2022-05-12 | 2024-03-29 | 中国重汽集团济南特种车有限公司 | All-wheel steering snow remover all-wheel drive chassis |
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Application publication date: 20151007 |