CN110667698A - Emergency steering system and mixer truck - Google Patents
Emergency steering system and mixer truck Download PDFInfo
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- CN110667698A CN110667698A CN201911095520.4A CN201911095520A CN110667698A CN 110667698 A CN110667698 A CN 110667698A CN 201911095520 A CN201911095520 A CN 201911095520A CN 110667698 A CN110667698 A CN 110667698A
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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
- B62D5/30—Safety devices, e.g. alternate emergency power supply or transmission means to ensure steering upon failure of the primary steering means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60P—VEHICLES ADAPTED FOR LOAD TRANSPORTATION OR TO TRANSPORT, TO CARRY, OR TO COMPRISE SPECIAL LOADS OR OBJECTS
- B60P3/00—Vehicles adapted to transport, to carry or to comprise special loads or objects
- B60P3/16—Vehicles adapted to transport, to carry or to comprise special loads or objects for carrying mixed concrete, e.g. having rotatable drums
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Abstract
The invention provides an emergency steering system and a mixer truck, wherein the emergency steering system comprises: a diverter; the first hydraulic oil way is communicated with the steering gear and is provided with a steering oil pump; the second hydraulic oil path is communicated with the steering gear and is provided with a variable displacement oil pump and a reversing valve assembly; the controller is electrically connected with the reversing valve component; the first sensor is electrically connected with the controller and acquires torque input by the steering wheel; when the torque is larger than or equal to the first preset threshold value, the second hydraulic oil path is communicated, and the variable displacement oil pump supplies oil to the steering gear through the second hydraulic oil path. By the technical scheme, smooth rotation of the steering wheel is guaranteed, and the problems that the steering wheel is heavy in steering and is blocked due to insufficient oil supply of a steering gear are solved.
Description
Technical Field
The invention relates to the technical field of vehicle power steering systems, in particular to an emergency steering system and a mixer truck.
Background
The conventional hydraulic power steering system of a special automobile such as a mixer truck generally only has one hydraulic circuit, and if the conventional hydraulic power steering system cannot solve the problems that the steering pump fails to steer, the steering flow is insufficient, the steering is heavy, and the engine suddenly stops during running and cannot provide power-assisted steering, in the prior art, the second hydraulic circuit is arranged, the energy accumulator is arranged in the second hydraulic circuit, and oil is supplied to the hydraulic power steering device through the energy accumulator when the engine of the whole automobile suddenly stops, so that the steering function of the vehicle in a short time is realized.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art or the related art.
In view of the above, an object of the present invention is to provide an emergency steering system.
The invention further aims to provide a mixer truck correspondingly.
In order to achieve at least one of the above objects, according to a first aspect of the present invention, there is provided an emergency steering system including: a diverter; the first hydraulic oil way is communicated with the steering gear and is provided with a steering oil pump capable of supplying oil to the steering gear; the second hydraulic oil path is communicated with the steering gear and is provided with a variable displacement oil pump capable of supplying oil to the steering gear and a reversing valve assembly for controlling the second hydraulic oil path to be switched on and off; the controller is electrically connected with the reversing valve component; the first sensor is electrically connected with the controller and acquires torque input by the steering wheel; when the torque is larger than or equal to the first preset threshold value, the controller controls the reversing valve assembly to be in the second state to enable the second hydraulic oil circuit to be communicated, and the variable displacement oil pump supplies oil to the steering gear through the second hydraulic oil circuit.
According to the emergency steering system provided by the invention, the first hydraulic oil path and the second hydraulic oil path are respectively communicated with the steering gear, the first hydraulic oil path is provided with a steering oil pump capable of supplying oil to the steering gear, the second hydraulic oil path is provided with a variable displacement oil pump capable of supplying oil to the steering gear, so that the steering gear can normally run through the oil supply of the first hydraulic circuit and the second hydraulic circuit, the second hydraulic oil path is also provided with a reversing valve component, the reversing valve component can control the on-off of the second hydraulic oil path, specifically, the controller is electrically connected with the reversing valve component, the first sensor is electrically connected with the controller, the first sensor acquires the torque input by a steering wheel and transmits the acquired torque data to the controller, and the controller controls the reversing valve component to act according to the comparison relation between the magnitude of the torque and a first preset threshold value so as to realize the connection and the disconnection of the second hydraulic oil path, when the torque is smaller than a first preset threshold value, the torque is smaller when the steering wheel rotates, the steering wheel rotates lightly, the controller controls the reversing valve assembly to be in a first state so as to disconnect the second hydraulic oil circuit, the emergency steering system supplies oil to the steering gear through the steering oil pump in the first hydraulic oil circuit, the steering gear operates normally, and at the moment, the oil supplied to the steering pump through the first hydraulic oil circuit is sufficient; when the torque is larger than or equal to a first preset threshold value, the torque is overlarge when the steering wheel rotates, the steering wheel rotates heavier, the emergency steering system supplies oil to the steering gear through the steering oil pump in the first hydraulic oil path, at the moment, the oil supplied to the steering pump through the first hydraulic oil path is insufficient, the controller controls the reversing valve assembly to be in the second state so that the second hydraulic oil path is communicated, and the variable displacement oil pump in the second hydraulic oil path supplies oil to the steering gear so as to increase the oil supplied to the steering gear, so that the steering gear operates normally, the steering wheel rotates lighter, the smooth rotation of the steering wheel is guaranteed, and the problems that the steering wheel is heavy in steering and is blocked due to the fact that the oil supply amount of the steering gear is insufficient are solved.
The first preset threshold value can be determined according to the torque required to be applied when the steering wheel rotates when the steering gear normally operates.
In the above technical solution, the method further comprises: the second sensor is electrically connected with the controller and acquires the rotating speed of the engine; when the rotating speed is less than or equal to the second preset threshold value, the controller controls the reversing valve assembly to be in the second state so that the second hydraulic oil circuit is communicated, and the variable displacement oil pump supplies oil to the steering gear through the second hydraulic oil circuit.
In the technical scheme, the second sensor is electrically connected with the controller, the second sensor acquires the rotating speed of the engine, when the rotating speed of the engine is greater than a second preset threshold value, the rotating speed of the engine is normal, the engine provides sufficient driving force for the steering oil pump, the steering oil pump supplies sufficient oil to the steering gear, the controller controls the reversing valve assembly to be in a first state, so that the second hydraulic oil path is disconnected, and the steering oil pump supplies oil to the steering gear through the first hydraulic oil path; when the rotating speed of the engine is less than or equal to a second preset threshold, the rotating speed of the engine is low, and the engine may have an idling problem, so that the oil quantity supplied to the steering gear by the steering oil pump driven by the engine through the first hydraulic oil circuit is insufficient, and the steering wheel is heavy to steer, therefore, the controller controls the reversing valve assembly to be in the second state to enable the second hydraulic oil circuit to be communicated, the variable displacement oil pump supplies oil to the steering gear through the second hydraulic oil circuit to increase the oil quantity supply of the steering gear, ensure the normal operation of the steering gear, ensure the smooth rotation of the steering wheel, and avoid the problems of heavy steering, jamming and the like of the steering wheel caused by the insufficient oil supply of the steering gear.
It should be noted that the second preset threshold value may be determined according to the lowest idle speed of the engine of different vehicles or different engine types.
In the above technical solution, the reversing valve assembly specifically includes: the first hydraulic control one-way valve is arranged on a second hydraulic oil path between the steering gear and an oil outlet of the variable displacement oil pump; the first one-way valve is arranged on a second hydraulic oil path between the first hydraulic control one-way valve and an oil outlet of the variable displacement oil pump; the second hydraulic control one-way valve is arranged on a second hydraulic oil path between the steering gear and the oil inlet of the variable displacement oil pump; an oil outlet of the electromagnetic hydraulic directional valve is respectively connected with control ports of the first hydraulic control one-way valve and the second hydraulic control one-way valve, and an oil inlet of the electromagnetic hydraulic directional valve is connected with a second hydraulic oil path between the steering gear and an oil outlet of the variable displacement oil pump; the oil inlet of the first hydraulic control one-way valve is connected with the steering gear, the oil outlet of the first hydraulic control one-way valve is connected with the oil outlet of the first one-way valve, the oil inlet of the first one-way valve is connected with the oil outlet of the variable displacement oil pump, the oil inlet of the variable displacement oil pump is connected with the oil inlet of the second hydraulic control one-way valve, the oil outlet of the second hydraulic control one-way valve is connected with the steering gear, the electromagnetic hydraulic reversing valve is electrically connected with the controller, the controller controls the electromagnetic hydraulic reversing valve to drive the first hydraulic control one-way valve and the second hydraulic control one-way valve to change the communication direction, and switching between the first state and the second.
In the technical scheme, the reversing valve comprises a first hydraulic control one-way valve, a second hydraulic control one-way valve and an electromagnetic hydraulic reversing valve which is simultaneously and electrically connected with the first hydraulic control one-way valve and the second hydraulic control one-way valve, the electromagnetic hydraulic reversing valve controls the direction of switching communication of the first hydraulic control one-way valve and the second hydraulic control one-way valve, so that the first hydraulic control one-way valve and the second hydraulic control one-way valve are switched between one-way communication and two-way communication, specifically, a first one-way valve is arranged between the first hydraulic control one-way valve and an oil outlet of a variable displacement oil pump, wherein an oil inlet of the first hydraulic control one-way valve is connected with a steering gear, an oil outlet of the first hydraulic control one-way valve is connected with the oil outlet of the first one-way valve, an oil inlet of the variable displacement oil pump is connected with an oil inlet of the second hydraulic control one-way valve, an oil outlet of the second hydraulic control one-way, when the first hydraulic control one-way valve and the second hydraulic control one-way valve are in a one-way conduction state, the conduction direction of the first hydraulic control one-way valve is opposite to the conduction direction of the first one-way valve, so that the second hydraulic oil circuit is disconnected, and when the first hydraulic control one-way valve and the second hydraulic control one-way valve are in a two-way conduction state, the second hydraulic oil circuit forms a passage, hydraulic oil flows out from an oil outlet of the variable displacement oil pump, flows in from an oil inlet of the steering gear through the first one-way valve and the first hydraulic control one-way valve in sequence, flows out from the oil outlet of the steering gear, and flows in to an oil inlet of the variable displacement oil pump through the second; it should be noted that the oil outlet of the electromagnetic hydraulic directional valve is respectively connected with the control ports of the first hydraulic control one-way valve and the second hydraulic control one-way valve, and the electromagnetic hydraulic directional valve is electrically connected with the controller, so that the controller controls the disconnection and connection of the electromagnetic hydraulic directional valve, and the electromagnetic hydraulic directional valve can control the first hydraulic control one-way valve and the second hydraulic control one-way valve to switch from one-way conduction to two-way conduction, thereby realizing the switching between the first state and the second state and controlling the connection and disconnection of the second hydraulic oil path.
The hydraulic control one-way valve is different from a common one-way valve in that one more control oil way is provided, when the control oil way is not communicated with pressure oil, the hydraulic control one-way valve works like a common one-way valve, and the pressure oil only flows from an oil inlet to an oil outlet and cannot reversely flow. When control pressure is input into the control oil path, the piston mandril moves rightwards under the action of pressure oil, and the one-way valve is jacked open by the mandril, so that the oil inlet and the oil outlet are communicated. If the oil outlet is larger than the oil inlet, the oil can flow reversely.
In the above technical solution, the method further comprises: and the energy accumulator is connected with the first hydraulic oil circuit between the first hydraulic control one-way valve and the first one-way valve.
In the technical scheme, an energy accumulator is arranged on a second hydraulic oil path between a first hydraulic control one-way valve and an oil outlet of a variable displacement oil pump, the energy accumulator is connected with an electromagnetic directional valve, the second hydraulic oil path is disconnected when a steering gear normally operates, the variable displacement oil pump injects oil into the energy accumulator and charges energy, when an engine is shut down, a steering oil pump of the first hydraulic oil path and the variable displacement oil pump on the second hydraulic oil path stop operating, the steering oil pump and the variable displacement oil pump stop supplying oil to the steering gear, at the moment, a controller controls a reversing valve assembly to be in a second state to enable the second hydraulic oil path to be communicated, the energy accumulator supplies oil to the steering gear through the second hydraulic oil path, and therefore the purpose that a vehicle can still normally operate in a short time in an emergency state of the engine, emergency steering is achieved, and the safety of vehicle driving is improved.
In the above technical solution, the method further comprises: the first hydraulic radiator, the first hydraulic oil tank and the first hydraulic filter are sequentially connected in series on the first hydraulic oil path, the first hydraulic oil tank is arranged between the first hydraulic radiator and the first hydraulic filter, and the first hydraulic filter is arranged between the first hydraulic oil tank and an oil inlet of the steering oil pump; the second one-way valve is arranged on the first hydraulic oil path between the oil outlet of the steering oil pump and the steering gear, and the oil inlet of the second one-way valve is connected with the oil outlet of the steering oil pump; and the first overflow valve and the steering oil pump are connected in parallel on the first hydraulic oil path.
In the technical scheme, a first hydraulic radiator, a first hydraulic oil tank and a first hydraulic filter are sequentially connected in series in a first hydraulic oil path, the first hydraulic oil tank is arranged between the first hydraulic radiator and the first hydraulic filter, and the first hydraulic filter is arranged between the first hydraulic oil tank and the oil inlet of the steering oil pump, so that when the vehicle runs normally, the hydraulic oil flowing out of the oil outlet of the steering gear flows through the first hydraulic radiator, the first hydraulic oil tank and the first hydraulic filter in sequence, wherein, the first hydraulic radiator can reduce the temperature of the high-temperature hydraulic oil flowing out of the oil outlet of the steering gear, so as to ensure that the emergency steering system can continuously and normally operate, the hydraulic oil can filter impurities in the hydraulic oil through the first liquid filter, for example, the scale, welding slag, scrap iron, paint and the like, and avoid the abrasion of the steering gear caused by the excessive impurities entering the steering gear; a second one-way valve is arranged on a first hydraulic oil path arranged between an oil outlet of the steering oil pump and the steering gear, and an oil inlet of the second one-way valve is connected with the oil outlet of the steering oil pump, so that hydraulic pressure can only flow from the oil outlet of the steering oil pump to the oil inlet of the steering gear in a one-way mode, and the backflow of hydraulic oil is avoided; and the first overflow valve and the steering oil pump are connected in parallel on the first hydraulic oil path, so that the oil outlet of the steering oil pump keeps stable oil pressure, and the overload of the first hydraulic oil path is avoided.
In the technical scheme, the steering oil pump is connected with the engine, and the steering oil pump is driven by the engine to supply oil to the steering gear.
In the technical scheme, the steering oil pump is connected with the engine, so that the steering oil pump supplies hydraulic oil to the steering gear to provide driving force, and sufficient oil supply is ensured.
In the above technical solution, the method further comprises: the second hydraulic radiator, the second hydraulic oil tank and the second hydraulic filter are sequentially connected in series on a second hydraulic oil path, the second hydraulic oil tank is arranged between the second hydraulic radiator and the second hydraulic filter, and the second hydraulic filter is arranged between the second hydraulic oil tank and an oil inlet of the variable displacement oil pump; the first overflow valve and the variable displacement oil pump are connected in parallel on the second hydraulic oil path; and the pressure reducing valve is connected in series on a second hydraulic oil path between the second one-way valve and the first hydraulic control one-way valve.
In the technical scheme, a second hydraulic radiator, a second hydraulic oil tank and a second hydraulic filter are sequentially connected in series in a second hydraulic oil path, the second hydraulic oil tank is arranged between the second hydraulic radiator and the second hydraulic filter, and the second hydraulic filter is arranged between the second hydraulic oil tank and an oil inlet of a variable displacement oil pump, so that when a vehicle is supplied with oil through the second hydraulic oil path, hydraulic oil flowing out of an oil outlet of a steering gear sequentially flows through the second hydraulic radiator, the second hydraulic oil tank and the second hydraulic filter and flows into the steering gear again through the variable displacement oil pump, wherein the second hydraulic radiator can reduce the temperature of high-temperature hydraulic oil flowing out of an oil outlet of the steering gear so as to ensure that an emergency steering system can continuously and normally operate, and the hydraulic oil can filter impurities in the hydraulic oil through the second hydraulic filter, such as water rust, welding slag and the like, Scrap iron, coating and the like, so that excessive impurities are prevented from entering the inside of the steering gear to cause the abrasion of the steering gear; the second overflow valve and the variable displacement oil pump are connected in parallel on the second hydraulic oil path, so that the oil outlet of the variable displacement oil pump keeps stable oil pressure, and the overload of the second hydraulic oil path is avoided; and a pressure reducing valve is further arranged on a second hydraulic oil circuit between the second one-way valve and the first hydraulic control one-way valve, so that hydraulic oil with stable oil pressure is supplied to the steering gear through the second hydraulic oil circuit, and steering blockage is avoided.
In the technical scheme, the variable displacement oil pump is connected with the engine, and the variable displacement oil pump is driven by the engine to supply oil to the steering gear.
In the technical scheme, the variable displacement oil pump is connected with the engine to provide driving force for the variable displacement oil pump to supply hydraulic oil to the steering gear, so that sufficient oil supply is ensured.
In the technical scheme, in the first state, the electromagnetic hydraulic directional valve is disconnected, the first hydraulic control one-way valve and the second hydraulic control one-way valve are in one-way conduction, the conduction directions of the first hydraulic control one-way valve and the second hydraulic control one-way valve are opposite to that of the first one-way valve, and the second hydraulic oil circuit is disconnected; in the second state, the electromagnetic hydraulic directional valve is communicated, the first hydraulic control one-way valve and the second hydraulic control one-way valve are conducted in two directions, and the second hydraulic oil path is communicated.
In the technical scheme, in a first state, the electromagnetic hydraulic directional valve is disconnected, and when the first hydraulic control one-way valve and the second hydraulic control one-way valve are in one-way conduction, the conduction direction is opposite to the conduction direction of the first one-way valve, so that the flow of hydraulic oil in the second hydraulic oil way is blocked, and the second hydraulic oil way is disconnected; and in a second state, the electromagnetic hydraulic directional valve is communicated, control pressure is input to control ports of the first hydraulic control one-way valve and the second hydraulic control one-way valve through the electromagnetic hydraulic directional valve, the piston ejector rod moves rightwards under the action of pressure oil, the ejector rod is used for ejecting the one-way valve to enable the oil inlet and the oil outlet to be communicated, when oil outlets of the first hydraulic control one-way valve and the second hydraulic control one-way valve are larger than oil inlets, hydraulic oil flows reversely to achieve bidirectional communication of the first hydraulic control one-way valve and the second hydraulic control one-way valve, the second hydraulic oil path is communicated, and the engine drives the variable displacement oil pump to supply oil to the steering gear through the second.
The technical scheme of the second aspect of the invention provides a mixer truck, which comprises: an engine; in the steering system according to any one of the first aspect technical solutions, the steering oil pump and the variable displacement oil pump of the steering system are connected to the engine, and the variable displacement oil pump is an upper-mounted variable displacement oil pump.
According to a second aspect of the present invention, the steering oil pump and the variable displacement oil pump of the steering system according to any one of the above first aspect of the present invention are connected to the engine to provide driving force for the operation of the steering oil pump and the variable displacement oil pump through the engine, wherein the variable displacement oil pump is an upper-mounted variable displacement oil pump to provide emergency steering hydraulic energy by using the upper-mounted variable displacement oil pump, and the cost is low without additionally adding an oil pump.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
FIG. 1 illustrates a schematic structural diagram of an emergency steering system according to one embodiment of the present invention;
FIG. 2 illustrates an emergency steering system hydraulic oil flow schematic according to one embodiment of the present invention;
FIG. 3 illustrates an emergency steering system hydraulic oil flow schematic according to one embodiment of the present invention;
fig. 4 shows a hydraulic oil flow schematic of an emergency steering system according to an embodiment of the invention.
Wherein, the correspondence between the reference numbers and the part names in fig. 1 to 4 is:
10 steering gear, 20 first hydraulic oil circuit, 22 steering oil pump, 24 first hydraulic radiator, 26 first hydraulic oil tank, 28 first hydraulic filter, 210 second check valve, 212 first overflow valve, 30 second hydraulic oil circuit, 32 variable displacement oil pump, 34 reversing valve assembly, 342 first hydraulic control check valve, 344 second hydraulic control check valve, 346 electromagnetic hydraulic reversing valve, 36 accumulator, 38 second hydraulic radiator, 310 second hydraulic oil tank, 312 second hydraulic filter, 314 first check valve, 316 reducing valve, 318 second overflow valve, 40 engine, 50 controller.
Detailed Description
So that the manner in which the above recited objects, features and advantages of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to the embodiments thereof which are illustrated in the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
Some embodiments according to the invention are described below with reference to fig. 1 to 4.
Example 1
As shown in fig. 1, according to an embodiment of the present invention, there is provided an emergency steering system defining:
the emergency steering system includes: the steering gear comprises a steering gear 10, a first hydraulic oil path 20, a second hydraulic oil path 30, a steering oil pump 22, a variable displacement oil pump 32, a reversing valve assembly 34, a controller 50 and a first sensor, wherein the first hydraulic oil path 20 and the second hydraulic oil path 30 are respectively communicated with the steering gear 10, the steering oil pump 22 is arranged on the first hydraulic oil path 20, the steering oil pump 22 can supply oil to the steering gear 10, the variable displacement oil pump 32 is arranged on the second hydraulic oil path 30, and the variable displacement oil pump 32 can supply oil to the steering gear 10, so that the steering gear 10 can normally run through the oil supply of the first hydraulic circuit and the second hydraulic circuit; the reversing valve assembly 34 is arranged on the second hydraulic oil circuit 30, the reversing valve assembly 34 can control the on-off of the second hydraulic oil circuit 30, specifically, the controller 50 is electrically connected with the reversing valve assembly 34, the first sensor is electrically connected with the controller 50, and the first sensor acquires the torque input by the steering wheel, and transmits the acquired torque data to the controller 50, and the controller 50 controls the action of the reversing valve assembly 34 according to the comparison relationship between the magnitude of the torque and the first preset threshold value, so as to realize the connection and disconnection of the second hydraulic oil path 30, and in detail, when the torque is smaller than the first preset threshold value, the controller 50 controls the reversing valve assembly 34 to be in the first state to disconnect the second hydraulic oil path 30, the emergency steering system supplies oil to the steering gear 10 through the steering oil pump 22 in the first hydraulic oil path 20, the steering gear 10 operates normally, and at the moment, the oil amount supplied to the steering pump through the first hydraulic oil path 20 is sufficient; when the torque is greater than or equal to a first preset threshold value, the emergency steering system supplies oil to the steering gear 10 through the steering oil pump 22 in the first hydraulic oil path 20, at this time, the oil amount supplied to the steering pump through the first hydraulic oil path 20 is insufficient, the controller 50 controls the reversing valve assembly 34 to be in the second state so as to enable the second hydraulic oil path 30 to be communicated, and the variable displacement oil pump 32 in the second hydraulic oil path 30 supplies oil to the steering gear 10 so as to increase the oil amount supplied to the steering gear 10, so that the steering gear 10 operates normally, the rotation of the steering wheel is lighter, the smooth rotation of the steering wheel is ensured, and the problems that the steering wheel is heavy in steering and is stuck due to the insufficient oil supply of the steering gear 10 are solved.
When the steering oil pump 22 supplies oil to the steering gear 10 in a short time and the steering wheel is steered heavily, the second hydraulic oil path 30 is connected, and the direction of the hydraulic oil flowing through the variable displacement oil pump 32 to the steering gear 10 is the direction indicated by the arrow in fig. 3 when the steering oil pump 22 supplies oil to the steering gear 10 and the second hydraulic oil path 30 is connected.
Example 2
As shown in fig. 1 and 3, in addition to the features of the above embodiment, further defined are:
the emergency steering system further includes: the second sensor is electrically connected with the controller 50, the second sensor acquires the rotating speed of the engine 40, and when the rotating speed of the engine 40 is greater than a second preset threshold value, the controller 50 controls the reversing valve assembly 34 to be in a first state, so that the second hydraulic oil path 30 is disconnected, and the steering oil pump 22 supplies oil to the steering gear 10 through the first hydraulic oil path 20; when the rotation speed of the engine 40 is less than or equal to the second preset threshold, which indicates that the rotation speed of the engine 40 is low, the engine 40 may have an idle speed problem, so that the oil supplied to the steering gear 10 by the start-up driving steering oil pump 22 through the first hydraulic oil path 20 is insufficient, and the steering wheel is heavy to steer, therefore, the controller 50 controls the reversing valve assembly 34 to be in the second state, so that the second hydraulic oil path 30 is communicated, the variable displacement oil pump 32 supplies oil to the steering gear 10 through the second hydraulic oil path 30, so as to increase the oil supply to the steering gear 10, ensure the normal operation of the steering gear 10, ensure the smooth rotation of the steering wheel, and avoid the problems of heavy steering wheel steering, jamming and the like caused by the insufficient oil supply to the steering gear 10.
When the engine 40 is idling or the steering oil pump 22 fails to supply oil to the steering gear 10 in an insufficient amount, so that the steering wheel is steered heavily, the flow direction of the hydraulic oil in the second hydraulic oil path 30 is the direction indicated by the arrow on the second hydraulic oil path 30 in fig. 3.
Example 3
As shown in fig. 1, in addition to the features of any of the embodiments described above, further defined are:
the reversing valve assembly 34 specifically includes: the hydraulic control system comprises a first hydraulic control one-way valve 342, a second hydraulic control one-way valve 344 and an electromagnetic hydraulic directional valve 346, wherein the electromagnetic hydraulic directional valve 346 is electrically connected with the first hydraulic control one-way valve 342 and the second hydraulic control one-way valve 344 so as to control the direction of communication of the first hydraulic control one-way valve 342 and the second hydraulic control one-way valve 344 through the electromagnetic hydraulic directional valve 346, the first hydraulic control one-way valve 342 is arranged on a second hydraulic oil path 30 between the steering gear 10 and an oil outlet of the variable displacement oil pump 32, and the second hydraulic control one-way valve 344 is arranged on the second hydraulic oil path 30 between the steering gear 10 and an oil inlet of the variable displacement oil pump 32; wherein, a first check valve 314 is further arranged between the first pilot-controlled check valve 342 and the oil outlet of the variable displacement oil pump 32, wherein the oil inlet of the first pilot-controlled check valve 342 is connected with the steering gear 10, the oil outlet of the first pilot-controlled check valve 342 is connected with the oil outlet of the first check valve 314, the oil inlet of the first check valve 314 is connected with the oil outlet of the variable displacement oil pump 32, the oil inlet of the variable displacement oil pump 32 is connected with the oil inlet of the second pilot-controlled check valve 344, the oil outlet of the second pilot-controlled check valve 344 is connected with the steering gear 10, the oil outlet of the electromagnetic hydraulic directional valve 346 is respectively connected with the control ports of the first pilot-controlled check valve 342 and the second pilot-controlled check valve 344, and the electromagnetic hydraulic directional valve 346 is electrically connected with the controller, so that the electromagnetic hydraulic directional valve 346 can control the first pilot-controlled check valve 342 and the second pilot-controlled check valve 344 to switch from one-way conduction to two-way conduction through the controller, and further, the switching between the first state and the second state is realized, and the on-off of the second hydraulic oil circuit 30 is controlled.
Example 4
As shown in fig. 1 and 4, in addition to the features of any of the above embodiments, further defined are: the emergency steering system further includes: the accumulator 36 is arranged on the second hydraulic oil path 30 between the first pilot-controlled one-way valve 342 and the oil outlet of the variable displacement oil pump 32, the accumulator 36 is connected with the electromagnetic directional valve, the second hydraulic oil path 30 is disconnected under the normal operation of the steering gear 10, the variable displacement oil pump 32 injects oil into the accumulator 36 for charging, when the engine is shut down, the steering oil pump 22 of the first hydraulic oil path 20 and the variable displacement oil pump 32 on the second hydraulic oil path 30 stop operating, the steering oil pump 22 and the variable displacement oil pump 32 stop supplying oil to the steering gear 10, at this time, the controller 50 controls the directional valve assembly 34 to be in the second state to enable the second hydraulic oil path 30 to be communicated, the accumulator 36 supplies oil to the steering gear 10 through the second hydraulic oil path 30, so that the steering gear 10 can still normally operate in a short time under the emergency state that the engine 40 is shut down, emergency steering is realized, and the running safety of the vehicle is improved, when the second hydraulic passage 30 is connected, the hydraulic oil flows in the direction indicated by the arrow in fig. 4 when the accumulator 36 supplies oil to the steering gear 10.
Example 5
As shown in fig. 1, in addition to the features of any of the embodiments described above, further defined are:
the emergency steering system further includes: a first hydraulic radiator 24, a first hydraulic tank 26, a first hydraulic filter 28, a second check valve 210, and a first relief valve 212; wherein, the first hydraulic radiator 24, the first hydraulic oil tank 26 and the first hydraulic filter 28 are connected in series on the first hydraulic oil path 20 in sequence, the first hydraulic oil tank 26 is arranged between the first hydraulic radiator 24 and the first hydraulic filter 28, and the first hydraulic filter 28 is disposed between the first hydraulic oil tank 26 and the oil inlet of the steering oil pump 22, so that when the vehicle is running normally, the hydraulic oil from the oil outlet of the steering gear 10 flows through the first hydraulic radiator 24, the first hydraulic oil tank 26 and the first hydraulic filter 28 in sequence, wherein the first hydraulic radiator 24 can lower the temperature of the high-temperature hydraulic oil flowing out of the oil outlet of the steering gear 10, so as to ensure that the emergency steering system can continuously and normally operate, the hydraulic oil can filter impurities in the hydraulic oil through the first liquid filter, such as water rust, welding slag, scrap iron, paint and the like, and prevents excessive impurities from entering the inside of the steering gear 10 to cause the abrasion of the steering gear 10; a second one-way valve 210 is arranged on the first hydraulic oil path 20 arranged between the oil outlet of the steering oil pump 22 and the steering gear 10, and the oil inlet of the second one-way valve 210 is connected with the oil outlet of the steering oil pump 22, so that hydraulic pressure can only flow from the oil outlet of the steering oil pump 22 to the oil inlet of the steering gear 10 in a one-way manner, and the backflow of hydraulic oil is avoided; the first overflow valve 212 is connected in parallel with the steering oil pump 22 on the first hydraulic oil path 20, so that the oil outlet of the steering oil pump 22 maintains a stable oil pressure, and the overload of the first hydraulic oil path 20 is avoided.
Example 6
As shown in fig. 1, in addition to the features of any of the embodiments described above, further defined are:
the steering oil pump 22 is connected to the engine 40 to provide a driving force for the steering oil pump 22 to supply hydraulic oil to the steering gear 10, thereby ensuring sufficient oil supply.
Example 7
As shown in fig. 1 and 3, in addition to the features of any of the above embodiments, further defined are:
the emergency steering system further includes: a second hydraulic radiator 38, a second hydraulic tank 310, a second hydraulic filter 312, a first check valve 314, a second relief valve 318, and a pressure reducing valve 316; wherein, the second hydraulic radiator 38, the second hydraulic tank 310 and the second hydraulic filter 312 are connected in series on the second hydraulic circuit 30 in sequence, the second hydraulic tank 310 is disposed between the second hydraulic radiator 38 and the second hydraulic filter 312, and the second hydraulic filter 312 is disposed between the second hydraulic tank 310 and the oil inlet of the variable displacement oil pump 32, so that when the vehicle is supplied with oil through the second hydraulic circuit 30, the hydraulic oil flowing out from the oil outlet of the steering gear 10 flows through the second hydraulic radiator 38, the second hydraulic tank 310 and the second hydraulic filter 312 in sequence, and flows into the steering gear 10 again through the variable displacement oil pump 32, wherein the second hydraulic radiator 38 can reduce the temperature of the high temperature hydraulic oil flowing out from the oil outlet of the steering gear 10, so as to ensure that the emergency steering system can continuously perform normal operation, and the hydraulic oil can filter impurities in the hydraulic oil through the second hydraulic filter, such as water rust, welding slag, scrap iron, paint and the like, and prevents excessive impurities from entering the inside of the steering gear 10 to cause the abrasion of the steering gear 10; a first check valve 314 is arranged on the second hydraulic oil path 30 arranged between the oil outlet of the variable displacement oil pump 32 and the steering gear 10, and the oil inlet of the first check valve 314 is connected with the oil outlet of the variable displacement oil pump 32, so that hydraulic pressure can only flow from the oil outlet of the steering oil pump 22 to the oil inlet of the steering gear 10 in a single direction, and the backflow of the hydraulic oil is avoided; a second relief valve 318 connected in parallel to the steering oil pump 22 in the second hydraulic oil path 30 to maintain a stable oil pressure at the oil outlet of the variable displacement oil pump 32; a pressure reducing valve 316 is further disposed on the second hydraulic passage 30 between the first check valve 314 and the first pilot check valve 342 to ensure that hydraulic oil with a stable oil pressure is supplied to the steering gear 10 through the second hydraulic passage 30, thereby preventing the steering from being stuck.
Example 8
As shown in fig. 1, in addition to the features of any of the embodiments described above, further defined are:
the variable displacement oil pump 32 is connected to the engine 40 to provide a driving force for the variable displacement oil pump 32 to supply hydraulic oil to the steering gear 10, ensuring sufficient oil supply.
Example 9
As shown in fig. 1, in addition to the features of any of the embodiments described above, further defined are:
in the first state, when the electromagnetic hydraulic directional valve 346 is turned off and the first pilot-operated check valve 342 and the second pilot-operated check valve 344 are in one-way conduction, the conduction direction is opposite to the conduction direction of the first check valve 314, and the flow of the hydraulic oil in the second hydraulic oil passage 30 is blocked, so that the second hydraulic oil passage 30 is turned off;
in the second state, the electromagnetic hydraulic directional valve 346 is communicated, the electromagnetic hydraulic directional valve 346 inputs control pressure to the control ports of the first hydraulic control one-way valve 342 and the second hydraulic control one-way valve 344, the piston rod moves rightwards under the action of pressure oil, the one-way valve is jacked open by the rod to connect the oil inlet and the oil outlet, when the oil outlets of the first hydraulic control one-way valve 342 and the second hydraulic control one-way valve 344 are larger than the oil inlet, hydraulic oil flows reversely to realize the bidirectional communication of the first hydraulic control one-way valve 342 and the second hydraulic control one-way valve 344, so that the second hydraulic oil path 30 is communicated, and the engine 40 drives the variable displacement oil pump 32 to supply oil to the steering gear 10 through the second hydraulic oil path 30.
Example 10
As shown in fig. 1, another embodiment of the present invention provides a mixer truck defining:
the vehicle comprises an engine 40, and the steering oil pump 22 and the variable displacement oil pump 32 of the steering system in any one of the embodiments are connected with the engine 40 to provide driving force for the operation of the steering oil pump 22 and the variable displacement oil pump 32 through the engine 40, wherein the variable displacement oil pump 32 is an upper-mounted variable displacement oil pump to provide emergency steering hydraulic energy by utilizing the upper-mounted oil pump, and the cost is low without additionally adding an oil pump.
Example 11
As shown in fig. 2, in a particular embodiment of the invention, there are defined:
the first hydraulic oil path is provided with a first hydraulic radiator 24, a first hydraulic oil tank 26, a first hydraulic filter 28, a steering oil pump 22 and a second one-way valve 210 which are sequentially connected in series, an oil inlet of the second one-way valve 210 is connected with an oil outlet of the steering oil pump 22, so that hydraulic pressure can only flow from the oil outlet of the steering oil pump 22 to an oil inlet of the steering gear 10 in a one-way mode, an oil outlet of the second one-way valve 210 is connected with an oil inlet of the steering gear 10, an oil outlet of the steering gear 10 is connected with an oil inlet of the first hydraulic radiator 24, the steering oil pump 22 is connected with the engine 40, wherein, under the normal operation of the engine,
the second hydraulic oil path 30 is cut off, the engine 40 drives the steering oil pump 22 to supply oil to the steering gear 10, the flow direction of the hydraulic oil is the direction pointed by the arrow in fig. 2, the hydraulic oil flows out from the oil outlet of the steering oil pump 22, passes through the second check valve 210, flows to the oil inlet of the steering gear 10, and sequentially flows through the first hydraulic radiator 24, the first hydraulic oil tank 26 and the first hydraulic filter 28, the circular flow of the hydraulic oil in the oil supply process is completed, the sufficient oil supply of the steering gear 10 is ensured, and the emergency steering system is enabled to operate normally.
Example 12
In another particular embodiment of the invention, as shown in fig. 3, there is defined:
the second hydraulic oil path 30 is provided with a second hydraulic check valve 344, a second hydraulic radiator 38, a second hydraulic oil tank 310, a second hydraulic filter 312, a variable displacement oil pump 32, a first check valve 314, a pressure reducing valve 316 and a first hydraulic check valve 342 which are connected in series in sequence, wherein an oil inlet of an electromagnetic hydraulic directional valve 346 is connected to the second hydraulic oil path 30 between an oil outlet of the pressure reducing valve 316 and the first hydraulic check valve 342, an oil outlet of the electromagnetic hydraulic directional valve 346 is respectively connected with control plungers of the first hydraulic check valve 342 and the second hydraulic check valve 344, an oil inlet of the first hydraulic check valve 342 is connected with an oil inlet of the steering gear 10, the engine 40 is connected with the variable displacement oil pump 32 to drive the variable displacement oil pump 32 to supply oil to the steering gear 10, the engine 40 is idling, or the steering oil pump 22 fails to cause insufficient oil supply of the steering gear 10, when the steering gear is heavy in steering, the controller 50 controls the electromagnetic hydraulic directional valve 346 to communicate, hydraulic oil flows through the electromagnetic hydraulic directional valve 346 to the control port of the first pilot-controlled one-way valve 342 and the control port of the second pilot-controlled one-way valve 344 through the second hydraulic oil path 30, the piston rod of the first pilot-controlled one-way valve 342 and the piston rod of the second pilot-controlled one-way valve 344 are pushed to move rightwards, the one-way valve structures inside the first pilot-controlled one-way valve 342 and the second pilot-controlled one-way valve 344 are pushed open, the hydraulic oil can flow reversely if the oil outlet is larger than the oil inlet, the first pilot-controlled one-way valve 342 and the second pilot-controlled one-way valve 344 are conducted reversely, the engine 40 drives the variable displacement oil pump 32 to supply oil to the steering gear 10 through the second hydraulic oil path 30, wherein the flow direction of the hydraulic oil is indicated by an arrow on the second hydraulic oil path 30 in fig. 3, specifically, the hydraulic oil flows out, The pressure reducing valve 316 and the first pilot-controlled check valve 342 flow into the steering gear 10 from an oil inlet of the steering gear 10, then flow out from an oil outlet of the steering gear 10, sequentially flow into an oil inlet of the variable displacement oil pump 32 through the second pilot-controlled check valve 344, the second hydraulic radiator 38, the second hydraulic oil tank 310 and the second hydraulic filter 312, complete the circular flow of the hydraulic oil on the second hydraulic oil path 30 during the oil supply process, ensure that the oil supply of the steering gear 10 is sufficient, and simultaneously, during the idling process of the engine 40, the first hydraulic oil path 20 supplies oil to the steering gear 10, and the flow direction of the hydraulic oil is the same as the direction indicated by the arrow on the first hydraulic oil path 20 in fig. 3.
Example 13
In a further particular embodiment of the invention, as shown in fig. 4, there is defined:
an accumulator 36 is arranged on the second hydraulic oil path 30 between the first pilot-controlled check valve 342 and the oil outlet of the variable displacement oil pump 32, the accumulator 36 is connected with the electromagnetic directional valve, when the engine 40 is shut down and stops rotating, the controller 50 controls the electromagnetic directional valve 346 to communicate, hydraulic oil flows out of the accumulator 36, flows through the electromagnetic directional valve 346 to the control port of the first pilot-controlled check valve 342 and the control port of the second pilot-controlled check valve 344 through the second hydraulic oil path 30, pushes the piston rod of the first pilot-controlled check valve 342 and the piston rod of the second pilot-controlled check valve 344 to move to the right, pushes open the check valves inside the first pilot-controlled check valve 342 and the second pilot-controlled check valve 344, and reversely conducts the first pilot-controlled check valve 342 and the second pilot-controlled check valve 344, the accumulator 36 supplies oil to the steering gear 10 through the second hydraulic oil path 30, wherein the flow direction of the hydraulic oil is indicated by an arrow on the second hydraulic oil path 30 in fig. 4, specifically, the hydraulic oil flows out from the oil outlet of the accumulator 36, flows into the steering gear 10 from the oil inlet of the steering gear 10 through the first pilot-controlled check valve 342, then flows out from the oil outlet of the steering gear 10, and flows into the second hydraulic oil tank 310 through the second pilot-controlled check valve 344 and the second hydraulic radiator 38 in sequence, so that the oil supply process is completed, the sufficient oil supply of the steering gear 10 is ensured, the steering gear 10 can keep normal operation in a short time, the emergency steering in the emergency state that the engine 40 is shut down is ensured, and the safety of vehicle operation is improved.
Example 14
As shown in fig. 1, a further specific embodiment of the present invention proposes an emergency steering system defining:
the emergency steering system includes: the power steering gear (namely, the steering gear 10), the engine 40, the steering oil pump 22, the upper-mounted variable displacement oil pump (namely, the variable displacement oil pump 32), the one-way valve, the hydraulic control one-way valve, the chassis steering radiator (namely, the first hydraulic radiator 24), the chassis steering oil tank (namely, the first hydraulic oil tank 26), the chassis steering filter (namely, the first hydraulic filter 28), the upper-mounted hydraulic system radiator (namely, the second hydraulic radiator 38), the upper-mounted hydraulic oil tank (namely, the second hydraulic oil tank 310), the upper-mounted hydraulic system filter (namely, the second hydraulic filter 312), the pressure reducing valve, the electromagnetic hydraulic reversing valve 346, the energy accumulator 36 and the controller 50, wherein the chassis steering radiator, the chassis steering oil tank, the chassis steering filter, the steering oil pump 22 and the one-way valve are sequentially connected to the first hydraulic oil path 20, an oil outlet of the steering oil pump 22 is connected, an oil outlet of the one-way valve is communicated with an oil inlet of the power steering gear through a first hydraulic oil path, and the steering oil pump is connected with the engine 40 so as to drive the steering oil pump to supply oil to the power steering gear through the engine 40; the upper-mounted high-pressure variable displacement pump is connected with a check valve, a pressure reducing valve and a hydraulic control check valve in series and is simultaneously merged into a steering hydraulic system to form a second emergency steering loop (namely a second hydraulic oil circuit 30), the second emergency steering loop is provided with an energy accumulator 36 and an electromagnetic directional valve for controlling the opening of the second emergency steering loop, the triggering of the electromagnetic directional valve is determined by a signal sent by a controller 50, a torque sensor (namely a first sensor) is arranged on a steering column, the controller 50 receives a steering wheel input torque signal (the steering pump fails, and the steering flow is insufficient and shows that the steering wheel input torque is increased and the steering is heavy) and an engine 40 rotating speed signal (the engine 40 is flamed out or the engine 40 idles to cause the flow to be heavy) and controls the electromagnetic hydraulic directional valve 346 to change when the steering wheel input torque is greater than a set value or the rotating speed of the engine, the oil inlet and the oil outlet are communicated, so that the hydraulic control check valve is opened, the second emergency steering loop is communicated, hydraulic power is provided for the steering gear 10, and the normal power-assisted steering function of the steering gear is ensured.
Because the pressure of the chassis steering hydraulic circuit is lower than that of the upper-mounted hydraulic circuit, a pressure reducing valve needs to be installed in the emergency circuit, meanwhile, in order to ensure that the engine 40 still has a normal steering power-assisted function under the condition of flameout, the energy accumulator 36 is installed in the emergency steering circuit, and when the engine 40 is flameout, oil is supplied to the steering gear 10 through the energy accumulator 36, so that the short-time steering power-assisted function is realized.
Further, check valves are installed on the emergency circuit and the original steering circuit (i.e., the first hydraulic line 20) to prevent a pressure loss due to a backflow of the hydraulic oil.
According to the emergency steering system provided by the invention, the smooth rotation of the steering wheel is ensured, so that the problems of heavy steering and jamming of the steering wheel caused by insufficient oil supply of a steering gear are solved, and the problems of incapability of assisting steering due to sudden flameout of an engine in a driving state and heavy steering in an idling state are solved.
In the present invention, the terms "first", "second", and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more unless expressly limited otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", "front", "rear", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or unit must have a specific direction, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An emergency steering system, comprising:
a diverter;
the first hydraulic oil path is communicated with the steering gear, and is provided with a steering oil pump capable of supplying oil to the steering gear;
the second hydraulic oil path is communicated with the steering gear and is provided with a variable displacement oil pump capable of supplying oil to the steering gear and a reversing valve assembly for controlling the second hydraulic oil path to be switched on and off;
a controller electrically connected to the reversing valve assembly;
the first sensor is electrically connected with the controller and acquires torque input by a steering wheel;
when the torque is smaller than a first preset threshold value, the controller controls the reversing valve assembly to be in the first state so that the second hydraulic oil path is disconnected, the torque is larger than or equal to the first preset threshold value, the controller controls the reversing valve assembly to be in the second state so that the second hydraulic oil path is communicated, and the variable displacement oil pump passes through the second hydraulic oil path to be supplied with oil to the steering gear.
2. The steering system of claim 1, further comprising:
the second sensor is electrically connected with the controller and acquires the rotating speed of the engine;
when the rotating speed is greater than the second preset threshold value, the controller controls the reversing valve assembly to be in the first state so as to enable the second hydraulic oil path to be disconnected, and when the rotating speed is smaller than or equal to the second preset threshold value, the controller controls the reversing valve assembly to be in the second state so as to enable the second hydraulic oil path to be communicated, and the variable displacement oil pump passes through the second hydraulic oil path to supply oil to the steering gear.
3. The steering system of claim 2, wherein the reversing valve assembly specifically comprises:
the first hydraulic control one-way valve is arranged on the second hydraulic oil path between the steering gear and the oil outlet of the variable displacement oil pump;
the first check valve is arranged on the second hydraulic oil path between the first hydraulic control check valve and the oil outlet of the variable displacement oil pump;
the second hydraulic control one-way valve is arranged on the second hydraulic oil path between the steering gear and the oil inlet of the variable displacement oil pump; an oil outlet of the electromagnetic hydraulic directional valve is respectively connected with control ports of the first hydraulic control one-way valve and the second hydraulic control one-way valve, and an oil inlet of the electromagnetic hydraulic directional valve is connected with the second hydraulic oil path between the steering gear and the oil outlet of the variable displacement oil pump;
the oil inlet of the first hydraulic control one-way valve is connected with the steering gear, the oil outlet of the first hydraulic control one-way valve is connected with the oil outlet of the first one-way valve, the oil inlet of the first one-way valve is connected with the oil outlet of the variable displacement oil pump, the oil inlet of the variable displacement oil pump is connected with the oil inlet of the second hydraulic control one-way valve, the oil outlet of the second hydraulic control one-way valve is connected with the steering gear, the electromagnetic hydraulic reversing valve is electrically connected with the controller, and the controller controls the electromagnetic hydraulic reversing valve to drive the first hydraulic control one-way valve and the second hydraulic control one-way valve to change the communication direction, so that switching between the first state and the second state is realized.
4. The steering system of claim 3, further comprising:
and the energy accumulator is connected with the first hydraulic oil path between the first hydraulic control one-way valve and the first one-way valve.
5. The steering system of claim 2, further comprising:
the first hydraulic radiator, the first hydraulic oil tank and the first hydraulic filter are sequentially connected to the first hydraulic oil path in series, the first hydraulic oil tank is arranged between the first hydraulic radiator and the first hydraulic filter, and the first hydraulic filter is arranged between the first hydraulic oil tank and an oil inlet of the steering oil pump;
the second one-way valve is arranged on a first hydraulic oil path between an oil outlet of the steering oil pump and the steering gear, and an oil inlet of the second one-way valve is connected with an oil outlet of the steering oil pump;
and the first overflow valve and the steering oil pump are connected in parallel on the first hydraulic oil path.
6. The steering system of claim 5,
the steering oil pump is connected with the engine, and the engine drives the steering oil pump to supply oil to the steering gear.
7. The steering system according to claim 3 or 4, characterized by further comprising:
the second hydraulic radiator, the second hydraulic oil tank and the second hydraulic filter are sequentially connected to the second hydraulic oil path in series, the second hydraulic oil tank is arranged between the second hydraulic radiator and the second hydraulic filter, and the second hydraulic filter is arranged between the second hydraulic oil tank and an oil inlet of the variable displacement oil pump;
the second overflow valve and the variable displacement oil pump are connected in parallel on the second hydraulic oil path;
and the pressure reducing valve is connected in series on the second hydraulic oil path between the first one-way valve and the first hydraulic control one-way valve.
8. The steering system of claim 7,
the variable displacement oil pump is connected with the engine, and the engine drives the variable displacement oil pump to supply oil to the steering gear.
9. The steering system of claim 7,
in the first state, the electromagnetic hydraulic directional valve is disconnected, the first hydraulic control one-way valve and the second hydraulic control one-way valve are in one-way conduction, the conduction directions of the first hydraulic control one-way valve and the second hydraulic control one-way valve are opposite to the conduction direction of the first one-way valve, and the second hydraulic oil circuit is disconnected;
in the second state, the electromagnetic hydraulic directional valve is communicated, the first hydraulic control one-way valve and the second hydraulic control one-way valve are conducted in two directions, and the second hydraulic oil path is communicated.
10. A mixer truck, comprising:
an engine;
the steering system according to any one of claims 1 to 9, a steering oil pump and a variable displacement oil pump of the steering system being connected to the engine, the variable displacement oil pump being a top-mount variable displacement oil pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911095520.4A CN110667698A (en) | 2019-11-11 | 2019-11-11 | Emergency steering system and mixer truck |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911095520.4A CN110667698A (en) | 2019-11-11 | 2019-11-11 | Emergency steering system and mixer truck |
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| CN110667698A true CN110667698A (en) | 2020-01-10 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112960034A (en) * | 2021-02-08 | 2021-06-15 | 西安主函数智能科技有限公司 | Emergency steering system and method for an autonomous drive-by-wire vehicle |
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2019
- 2019-11-11 CN CN201911095520.4A patent/CN110667698A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112960034A (en) * | 2021-02-08 | 2021-06-15 | 西安主函数智能科技有限公司 | Emergency steering system and method for an autonomous drive-by-wire vehicle |
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