CN110949502A - Double-end fire engine a steering system - Google Patents
Double-end fire engine a steering system Download PDFInfo
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- CN110949502A CN110949502A CN201911065014.0A CN201911065014A CN110949502A CN 110949502 A CN110949502 A CN 110949502A CN 201911065014 A CN201911065014 A CN 201911065014A CN 110949502 A CN110949502 A CN 110949502A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/06—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
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Abstract
The invention relates to the field of heavy vehicle steering systems, in particular to a double-head fire truck steering system which can optimize the power-assisted effect of the steering system. The utility model provides a double-end fire engine a steering system, includes automatically controlled hydraulic steering system and mechanical steering system, and mechanical steering system is initiative steering system, receives driver direct control, according to the behavior, can also adopt automatically controlled hydraulic steering system as passive assistance, assists mechanical steering system to accomplish multiple steering operation.
Description
Technical Field
The invention relates to the field of heavy vehicle steering systems, in particular to a double-head fire truck steering system.
Background
Currently, a mainstream truck and a conventional fire truck generally use a cab with a steering system. Because the particularity of the service environment of the fire engine often requires narrow access and dead ends, the equipment mounted on the fire engine is large in size, the field of vision for backing is poor, and an automobile which can be driven at two ends of the automobile without turning around or backing in a special environment is urgently needed. The fire engine can improve the police speed and save the life and property safety of people.
The double-head heavy-duty automobile is large in size and high in steering power assistance requirement, and a common steering system is poor in effect under a high-load condition.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a double-head fire truck steering system which can optimize the power-assisted effect of the steering system.
The scheme provided by the invention is as follows:
a double-head fire engine steering system comprises an oil tank, a first booster pump and an electric control hydraulic steering system, the electric control hydraulic steering system comprises a steering control valve and a first power-assisted oil cylinder, the steering control valve is a four-way proportional valve, the oil supply port of the steering control valve is connected with the oil tank through a first booster pump, the oil return port of the steering control valve is connected with the oil tank, a steering chamber and a centering chamber which are mutually independent are arranged in the first power cylinder, the steering chamber and the centering chamber are separated by a baffle arranged on the first power cylinder, a piston rod passes through the baffle, the output port of the steering control valve is connected with the steering chamber, the output port of the first power-assisted pump is connected with the centering chamber, the electric control hydraulic steering system comprises two groups of electric control hydraulic steering systems, two first steering power-assisted cylinders are respectively arranged on a front steering drive axle and a rear vehicle drive axle of a vehicle, and a first power-assisted pump is connected with two steering control valves.
The first power-assisted oil cylinder can play a role in driving steering, and can maintain a centering state in a non-steering state, so that the stability of the direction of the vehicle is ensured, two sets of electric control hydraulic steering systems are respectively arranged at the front axle and the rear axle of the vehicle, the simultaneous steering of the front wheel and the rear wheel can be realized, and the flexibility of the vehicle is improved.
Preferably, the piston rod of the first power-assisted oil cylinder is provided with a first piston, the first piston is located in the centering chamber, the centering chamber is divided into a first centering chamber and a second centering chamber by the first piston, and the first centering chamber and the second centering chamber are simultaneously connected with the output port of the first power-assisted pump. The first centering chamber and the second centering chamber are simultaneously connected with the output port of the first booster pump, so that the oil pressure at two positions can be ensured to be the same, and the position stability of the piston rod is ensured.
Preferably, the first power cylinder piston rod is provided with a second piston, the second piston is located in the steering chamber, the second piston divides the steering chamber into a first steering chamber and a second steering chamber, and the first steering chamber and the second steering chamber are respectively connected with an output port of the steering control valve. The control valve can realize the reciprocating motion of the piston rod by controlling the movement directions of hydraulic oil in the first steering chamber and the second steering chamber, and the wheels are driven by the first power-assisted cylinder to steer.
Preferably, the steering system further comprises a normally open electromagnetic valve, and two ends of the normally open electromagnetic valve are respectively connected with the first steering chamber and the second steering chamber. Normally open solenoid valve turns to room intercommunication with first room and second, has guaranteed not to have a pressure differential between the two, consequently does not play a role, and the centering room can be realized the fixed effect of piston rod centering, when needs turn to the operation, closes normally open solenoid valve, makes to turn to room and steering control valve intercommunication.
Preferably, the steering control valve is a three-position four-way proportional valve, the middle position is a P type, and the oil supply port is closed. And the oil passages are different in the middle position, and the other two positions respectively correspond to the hydraulic oil flow directions for driving the piston rod to perform bidirectional movement.
Preferably, the energy storage device is connected with the output port of the first power-assisted pump. The accumulator is used for emergencies, when the first booster pump cannot smoothly provide high-pressure oil, the accumulator can be opened, the first booster cylinder is controlled in a short time, a one-way valve is arranged between the accumulator and the first booster pump, and the first booster pump is prevented from being impacted by the hydraulic oil in the accumulator flowing to the first booster pump.
Preferably, the output port of the steering control valve is connected with the first power-assisted oil cylinder through a hydraulic lock. The hydraulic lock can ensure that when one end of the steering chamber is communicated with the steering control valve, the other passage of the hydraulic lock is opened at the same time.
Preferably, the steering system further comprises a mechanical steering system, the mechanical steering system comprises two steering gears, the two steering gears are provided with angle acquisition sensors, and the angle acquisition sensors are electrically connected with the steering control valve. The mechanical steering system is used as a main steering system, and the electric control hydraulic steering system is used as a secondary steering system for assisting to improve the steering torque.
Preferably, the mechanical steering system further comprises an oil tank, a second power pump and a switching valve, the switching valve is a two-position four-way valve, the oil tank, the second power pump and the switching valve form a loop, an oil supply port and an oil return port of the switching valve are respectively connected with the oil tank and the second power pump, the two steering devices respectively have one end connected with oil return of the oil tank, and the other end connected to different output ports of the switching valve. Through the action of the switching valve, two steering gears can be controlled, and the two steering gears are respectively arranged on different vehicle heads, so that double-position control can be realized.
The electric control hydraulic steering system can assist steering, improve steering torque, realize centering control of wheels in a non-steering state and prevent the wheels from deviating; the double-end fire engine can realize different operations, can realize the simultaneous steering of front and rear axle wheels, and the mechanical steering system and the electric control hydraulic steering system can respectively control front and rear different axles so as to realize the steering of the front wheels/rear wheels which are all angry, or the front and rear wheels are led to the steering and the reverse steering of the front and rear wheels.
Drawings
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present invention, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
FIG. 1 is a hydraulic schematic diagram of an electronically controlled hydraulic steering system;
FIG. 2 is an enlarged view at A in FIG. 1;
FIG. 3 is an enlarged view at B in FIG. 1;
FIG. 4 is a schematic view of a first power cylinder;
FIG. 5 is a schematic illustration of a mechanical steering system;
in the figure, 1-oil tank, 2-first power-assisted pump, 3-steering control valve, 4-hydraulic lock, 5-normally open solenoid valve, 6-first power-assisted oil cylinder, 7-steering gear, 8-oil tank, 9-second power-assisted pump, 10-switching valve, 11-piston rod, 12-first piston, 13-second piston, 14-baffle, 15-first steering chamber, 16-second steering chamber, 17-first centering chamber, 18-second centering chamber, 19-follower plate, 20-adjusting chamber, 21-accumulator, 22-one-way valve.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 to 5, the invention provides a double-head fire engine steering system, which comprises an oil tank 1, a first power pump 2 and an electric control hydraulic steering system, wherein the electric control hydraulic steering system comprises a steering control valve 3 and a first power cylinder 6, the steering control valve 3 is a four-way proportional valve, an oil supply port of the steering control valve 3 is connected with the oil tank 1 through the first power pump 2, an oil return port of the steering control valve 3 is connected with the oil tank 1, the first power cylinder 6 is internally provided with a steering chamber and a centering chamber which are independent from each other, the steering chamber and the centering chamber are separated by a baffle 14 arranged on the first power cylinder, a piston rod 11 passes through the baffle 14, an output port of the steering control valve 3 is connected with the steering chamber, an output port of the first power pump 2 is connected with the centering chamber, the electric control hydraulic steering system is two groups, the two first power cylinders are respectively arranged on a front steering drive axle and a rear vehicle drive axle of, the first booster pump 2 is connected to two steering control valves 3.
A piston rod 11 of the first power-assisted oil cylinder 6 is provided with a first piston 12, the first piston 12 is located in a centering chamber, the centering chamber is divided into a first centering chamber 17 and a second centering chamber 18 by the first piston 12, and the first centering chamber 17 and the second centering chamber 18 are simultaneously connected with an output port of the first power-assisted pump 2. The piston rod 11 is further provided with a second piston 13, the second piston 13 is located in the steering chamber, the second piston 13 divides the steering chamber into a first steering chamber 15 and a second steering chamber 16, and the first steering chamber 15 and the second steering chamber 16 are respectively connected with an output port of the steering control valve 3. A follow-up plate 19 is further arranged between the second piston 13 and the baffle 14, the follow-up plate 19, the piston rod 11 and the cylinder body can move freely, a fixed closed space adjusting chamber 10 is reserved between the follow-up plate 19 and the second piston, and a reserved adjusting opening is formed in the closed space adjusting chamber. In most cases the adjustment chamber is constant and the follower plate 19 follows the second piston 13, which can be done by changing the size of the adjustment chamber 20 when the position of the piston rod 11 needs to be adjusted.
The invention also comprises a normally open electromagnetic valve, wherein two ends of the normally open electromagnetic valve 5 are respectively connected with the first steering chamber 15 and the second steering chamber 16. The steering control valve 3 is a three-position four-way proportional valve, the middle position is P-shaped, and an oil supply port is closed. The output port of the steering control valve 3 is connected with a first power-assisted oil cylinder 6 through a hydraulic lock 4.
The energy accumulator 21 is further included, and the energy accumulator 21 is connected with the output port of the first booster pump 2. A check valve 22 is arranged between the accumulator 21 and the first booster pump 2 to prevent the hydraulic oil in the accumulator 21 from flowing to the first booster pump 2 and causing impact on the first booster pump 2.
The steering system also comprises a mechanical steering system, wherein the mechanical steering system comprises two steering gears 7, the mechanical steering system is provided with two angle acquisition sensors, the two angle acquisition sensors are arranged on a steering axle and can measure the turning angle value of the wheel side of the steering axle, and the angle acquisition sensors are electrically connected with the steering control valve 3. The mechanical steering system further comprises an oil tank 8, a second power pump 9 and a switching valve 10, the switching valve 10 is a two-position four-way valve, the oil tank 8, the second power pump 9 and the switching valve 10 form a loop, an oil supply port and an oil return port of the switching valve 10 are respectively connected with the oil tank 8 and the second power pump 9, one end of each of the two steering gears 7 is connected with the oil return of the oil tank 8, and the other end of each of the two steering gears is connected with different output ports of the switching valve 10.
The working principle of the invention is as follows:
two steering machines 7 in the mechanical steering system correspond to the main cab and the auxiliary cab, respectively. When the main cab is in an operating state, the electromagnet of the switching valve 10 is not energized, the port P of the switching valve 10 is communicated with the port P1, the port T of the switching valve 10 is communicated with the port P2, at this time, one steering gear 7 (the left steering gear in fig. 5) obtains the hydraulic oil pressed out by the second booster pump 9, and the oil supply port and the oil return port of the other steering gear 7 (the right steering gear in fig. 5) are both communicated with the oil return port of the steering oil tank through the oil return port of the switching valve 10. The steering gear 7 drives the steering of the wheels. When the steering operation is required in the passenger compartment, the switching valve 10 is actuated to switch the operating states of the two steering gears 7, thereby achieving steering of the other set of wheels.
The two groups of electric control hydraulic steering systems are respectively used for driving the steering of the front wheels or the rear wheels, when the full-wheel same-direction steering mode or the front-wheel reverse steering mode is needed, for example, a main cab controls the front-wheel steering chamber, the front-wheel electric control hydraulic steering system is controlled to stop working, the first power-assisted oil cylinder 6 is in a centering floating state and does not influence the steering of the front wheels, the electric control hydraulic steering system of the rear wheels is controlled to work, and the steering is realized by controlling the rear wheels and the front wheels to rotate in the same direction or in the reverse direction. When the vehicle only needs front wheel steering, the two groups of electric control hydraulic steering systems do not work.
When the electric control hydraulic steering system does not participate in steering, the steering control valve 3 and the normally open electromagnetic valve 5 are not powered, the first power-assisted oil cylinder 6 is in a centering locking state, the first steering chamber 15 and the second steering chamber 16 are communicated through the normally open electromagnetic valve 5, no pressure difference exists between the first steering chamber and the second steering chamber, and the piston rod 11 is ensured not to move. The first centering chamber 17 and the second centering chamber 18 are both communicated with the first booster pump 2, and have the same oil pressure, so that the cylinder centering state is maintained. When the electric control hydraulic steering system needs to work, the steering control valve 3 and the normally open electromagnetic valve 5 are powered on, the first steering chamber 15 and the second steering chamber 16 are respectively communicated with the oil return pipelines of the first power-assisted pump 2 and the oil tank 1 through the hydraulic lock 4 and the steering control valve 3, so that the first steering chamber 15 and the second steering chamber 16 are subjected to different pressure differences, the movement of the piston rod 11 is realized, and the wheels are driven to steer. The steering angle of the electrically controlled hydraulic steering system is affected by the opening degree of the steering control valve 3, and the opening degree of the steering control valve 3 is determined by the angle acquired by the angle sensor provided to the wheels.
When the first booster pump 2 fails or the oil circuit fails, causing no oil pressure in the system, the accumulator 21 may replace the oil tank 1 and the first booster pump 2 to provide oil pressure for the first booster cylinder 6.
Although the present invention has been described in detail by referring to the drawings in connection with the preferred embodiments, the present invention is not limited thereto. It will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. The utility model provides a double-end fire engine a steering system which characterized in that: the hydraulic steering system comprises an oil tank (1), a first power-assisted pump (2) and an electric control hydraulic steering system, wherein the electric control hydraulic steering system comprises a steering control valve (3) and a first power-assisted oil cylinder (6), the steering control valve (3) is a four-way proportional valve, an oil supply port of the steering control valve (3) is connected with the oil tank (1) through the first power-assisted pump (2), an oil return port of the steering control valve (3) is connected with the oil tank (1), a steering chamber and a centering chamber which are mutually independent are arranged in the first power-assisted oil cylinder (6), the steering chamber and the centering chamber are separated through a baffle (14) arranged on the first power-assisted oil cylinder (6), a piston rod (11) passes through the baffle (14) for setting, an output port of the steering control valve (3) is connected with the steering chamber, an output port of the first power-assisted pump (2) is connected with the centering chamber, and the electric control hydraulic steering system, the two first power-assisted steering cylinders (6) are respectively arranged on a front steering drive axle and a rear vehicle drive axle of the vehicle, and the first power-assisted pump (2) is connected with the two steering control valves (3).
2. The double-ended fire fighting vehicle steering system according to claim 1, wherein: the piston rod (11) of the first power-assisted oil cylinder (6) is provided with a first piston (12), the first piston (12) is located in the centering chamber, the centering chamber is divided into a first centering chamber (17) and a second centering chamber (18) by the first piston (12), and the first centering chamber (17) and the second centering chamber (18) are simultaneously connected with an output port of the first power-assisted pump (2).
3. The double-ended fire fighting vehicle steering system according to claim 1, wherein: the first power-assisted cylinder (6) is provided with a second piston (13) on a piston rod (11), the second piston (13) is located in a steering chamber, the steering chamber is divided into a first steering chamber (15) and a second steering chamber (16) by the second piston (13), and the first steering chamber (15) and the second steering chamber (16) are respectively connected with an output port of the steering control valve (3).
4. The double-ended fire fighting vehicle steering system according to claim 3, wherein: the steering system is characterized by further comprising a normally open electromagnetic valve (5), wherein two ends of the normally open electromagnetic valve (5) are respectively connected with a first steering chamber (15) and a second steering chamber (16).
5. The double-ended fire fighting vehicle steering system according to any one of claims 2 to 4, wherein: the steering control valve (3) is a three-position four-way proportional valve, the middle position is P-shaped, and an oil supply port is closed.
6. The double-ended fire fighting vehicle steering system according to any one of claims 1 to 4, wherein: the energy storage device is characterized by further comprising an energy storage device (21), wherein the energy storage device (21) is connected with an output port of the first booster pump (2).
7. The double-ended fire fighting vehicle steering system according to claim 3 or 4, wherein: the output port of the steering control valve (3) is connected with a first power-assisted oil cylinder (6) through a hydraulic lock (4).
8. The double-ended fire fighting vehicle steering system according to any one of claims 1 to 4, wherein: the steering system is characterized by further comprising a mechanical steering system, wherein the mechanical steering system comprises two steering gears (7), an angle acquisition sensor is arranged on each steering gear (7), and the angle acquisition sensors are electrically connected with the steering control valve (3).
9. The double-ended fire fighting vehicle steering system according to claim 8, wherein: mechanical steering system still includes oil tank (8), second helping hand pump (9) and diverter valve (10), diverter valve (10) are two cross valves, oil tank (8), second helping hand pump (9) form the return circuit with diverter valve (10), oil tank (8) and second helping hand pump (9), two are connected respectively with the oil return opening to the fuel feeding mouth of diverter valve (10) with the oil return opening the oil tank (8) oil return is respectively had one end to redirector (7), and the other end is connected to the different delivery outlets of diverter valve (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911065014.0A CN110949502A (en) | 2019-11-04 | 2019-11-04 | Double-end fire engine a steering system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911065014.0A CN110949502A (en) | 2019-11-04 | 2019-11-04 | Double-end fire engine a steering system |
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| Publication Number | Publication Date |
|---|---|
| CN110949502A true CN110949502A (en) | 2020-04-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911065014.0A Pending CN110949502A (en) | 2019-11-04 | 2019-11-04 | Double-end fire engine a steering system |
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| CN (1) | CN110949502A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113895514A (en) * | 2021-10-22 | 2022-01-07 | 国能神东煤炭集团有限责任公司 | Hydraulic steering wheel centering system and centering method |
-
2019
- 2019-11-04 CN CN201911065014.0A patent/CN110949502A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113895514A (en) * | 2021-10-22 | 2022-01-07 | 国能神东煤炭集团有限责任公司 | Hydraulic steering wheel centering system and centering method |
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Effective date of registration: 20230420 Address after: No. 583, Jiyan Road, Huaiyin District, Jinan City, Shandong Province, 250000 Applicant after: China National Heavy Duty Truck Group Ji'nan Special Vehicle Co.,Ltd. Address before: Shengjing tangwangshan Road North Panwang Road West, Zhangqiu City, Jinan City, Shandong Province 250200 Applicant before: China National Heavy Duty Truck Group Jinan Power Co.,Ltd. |