CN114312994A - Hydraulic steering power assisting device and system for multi-shaft vehicle - Google Patents
Hydraulic steering power assisting device and system for multi-shaft vehicle Download PDFInfo
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- CN114312994A CN114312994A CN202210022104.7A CN202210022104A CN114312994A CN 114312994 A CN114312994 A CN 114312994A CN 202210022104 A CN202210022104 A CN 202210022104A CN 114312994 A CN114312994 A CN 114312994A
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Abstract
The invention provides a hydraulic steering power assisting device and system for a multi-axle vehicle, which relate to the technical field of vehicles and adopt the following scheme: the invention is characterized by comprising an oil storage device, an oil supply device and an execution device which are connected together through a hydraulic pipeline, wherein the oil storage device, a steering oil pump, a steering valve group and the execution device form a steering loop through connecting oil pipes; the oil storage device, the steering emergency pump, the flow divider, the overflow valve I, the steering valve group and the execution device form an emergency steering loop through connecting oil pipes. When the steering loop has a fault, the steering valve group is automatically switched to the emergency steering loop, so that the stable and smooth oil supply of the steering system is ensured, and the safety and the reliability of the steering system are effectively ensured.
Description
Technical Field
The invention relates to the technical field of vehicles, in particular to a hydraulic steering power assisting device and system for a multi-axle vehicle.
Background
At present, a front axle steering or front double axle steering mode is mainly adopted for the multi-axle heavy-duty automobile, with the further development of the all-wheel steering technology, the head angle of the heavy-duty automobile with the all-wheel steering function is exposed preliminarily, and the existing steering power-assisted system can not be well adapted to the automobile type of the all-wheel steering, so that the development of the all-wheel steering technology in the multi-axle heavy-duty automobile is greatly limited. In addition, the emergency steering function is also receiving more and more attention, and many countries will install emergency steering systems as mandatory index items in the standard, which shows the importance of the emergency steering systems.
The hydraulic power-assisted system of the all-wheel steering heavy truck is very important, and has difficulties in pipeline arrangement, valve bank design and mechanical matching under the characteristics of long wheelbase and large tonnage. This is a disadvantage of the prior art.
Therefore, in view of the above-mentioned shortcomings of the prior art, it is an urgent need to develop a hydraulic power steering apparatus and system capable of achieving an all-wheel steering function and an emergency steering function of a multi-axle heavy vehicle.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a hydraulic steering power assisting device and system for a multi-axle vehicle, which are used for solving the problems that the steering of the multi-axle heavy vehicle is inconvenient and the power of the whole vehicle is easy to lose efficacy.
The technical scheme adopted by the invention for solving the technical problems is as follows: a hydraulic steering power assisting device for a multi-shaft vehicle comprises an oil storage device, an oil supply device and an executing device which are connected together through hydraulic pipelines, wherein the oil storage device is in a double-steering oil tank configuration, the oil storage device comprises a first steering oil tank, a second steering oil tank and an oil absorption connecting rubber pipe, and the first steering oil tank and the second steering oil tank are communicated through the oil absorption connecting rubber pipe. The oil storage device is characterized in that the oil ports with bulges are respectively arranged on the two sides of the steering oil tank I and the two sides of the steering oil tank II, the oil absorption connecting rubber pipe is sleeved on the oil ports with the bulges and then is fixed through the clamp, so that the oil storage device of the communicating device structure consisting of the steering oil tank I, the steering oil tank II and the oil absorption connecting rubber pipe is obtained, the oil storage device can be flexibly configured at the front part of a vehicle with a short arrangement space, the steering oil tank can be separately arranged at a proper position to jointly provide hydraulic oil for an energy supply system, in addition, the contact area of the oil liquid and the air is increased through the structure of the double steering oil tank, the heat exchange between the oil liquid and the air is convenient, the oil temperature of the steering system is effectively reduced, the high-temperature oxidation of parts such as sealing rings is prevented, and the service life of key parts is prolonged. The steering oil tank is integrated with an oil filter with a replaceable valve core, and can be used for filtering impurities such as water rust and scrap iron mixed in oil liquid and protecting precision elements such as a valve bank and a pump in a steering system. The oil storage device plays a role in storing hydraulic oil and also has a heat dissipation function.
Further, the oil supply device comprises a normal oil supply pipeline, an emergency oil supply pipeline and a steering valve group, a steering oil pump is arranged on the normal oil supply pipeline, the steering oil pump is installed on an air compressor of the engine, a steering emergency pump, an overflow valve I and a flow dividing valve are arranged on the emergency oil supply pipeline, the steering emergency pump is installed on a gearbox, the normal oil supply pipeline is connected between the oil storage device and the steering valve group, the emergency oil supply pipeline is connected between the oil storage device and the steering valve group, and the steering valve group is connected with an execution device. The high-pressure oil provided by the steering emergency pump is averagely divided into two parts by the flow divider valve, the two parts are respectively supplied to the steering loops of the front axle and the rear axle, and the overflow valve has the function of high-pressure overflow together, so that the steering emergency pump is effectively protected.
Furthermore, the steering valve group comprises a first reversing valve, a throttle valve, a one-way valve, a second reversing valve, a second overflow valve and an emergency lamp integrated circuit, wherein a normal oil supply pipeline and an emergency oil supply pipeline are connected to the first reversing valve, the throttle valve is connected to the first reversing valve in parallel, the second reversing valve is connected to the first reversing valve, the emergency lamp integrated circuit is connected to the second reversing valve, the second overflow valve is connected to a downstream pipeline of the first reversing valve and the second reversing valve, and a downstream pipeline of the first reversing valve and the second reversing valve is connected to an execution device. One-way valves are installed in both the control loop and the main loop, so that oil can be only conveyed in the forward direction and cannot flow reversely. And the steering valve group controls the position of the first reversing valve according to the flow of the hydraulic oil flowing through the throttle valve in the control liquid path, so that the steering loop and the emergency loop are quickly switched. The emergency lamp integrated circuit is opened and closed through the oil flow control circuit flowing through the second reversing valve, and the emergency lamp is lightened when the steering system breaks down, so that the whole vehicle is convenient to maintain and overhaul.
The oil storage device, the steering oil pump, the steering valve group and the execution device form a steering loop by connecting oil pipes, the invention is connected with two steering loops of a front axle and a rear axle in parallel, and four groups of steering axles are controlled to move by the steering valve group; the oil storage device, the steering emergency pump, the flow divider, the overflow valve I, the steering valve group and the execution device form an emergency steering loop through connecting oil pipes. When the steering loop has a fault, the steering valve group is automatically switched to the emergency steering loop, so that the stable and smooth oil supply of the steering system is ensured, and the safety and the reliability of the steering system are effectively ensured.
In addition, the invention also provides a hydraulic steering power-assisted system for the multi-shaft vehicle, which comprises an oil storage device, an oil supply device and an execution device which are connected together through hydraulic pipelines, wherein the oil supply device comprises a normal oil supply pipeline, an emergency oil supply pipeline and a steering valve group, oil is supplied through the normal oil supply pipeline during normal work, and oil is supplied through the emergency oil supply pipeline during failure; be provided with the steering oil pump on the normal oil supply pipeline, the steering oil pump is installed on the air compressor machine of engine, is provided with on the emergent oil supply pipeline and turns to emergency pump, overflow valve one, flow divider, turns to emergency pump and installs on the gearbox, and normal oil supply pipe coupling is between oil storage device and steering valve group, and emergent oil supply pipe coupling is between oil storage device and steering valve group, and steering valve group and execution device are connected. The first steering oil pump absorbs oil from the oil storage device and conveys high-pressure oil to the steering valve group, and the steering valve group judges whether the emergency loop is opened or not through the pressure of the flowing oil and conveys the high-pressure oil to the execution device. The steering oil pump is arranged on an air compressor of the engine, the air compressor drives the steering oil pump to supply oil when the engine works, the steering emergency pump is arranged on the gearbox, and the gearbox can drive the steering emergency pump to supply oil when the steering oil pump fails. The steering valve group is mainly integrated through a first reversing valve, a throttle valve, a one-way valve, a second reversing valve, a second overflow valve and an emergency lamp integrated circuit, when the steering device normally works, a steering oil pump sucks hydraulic oil out of an oil storage device, the obtained high-pressure oil enters the first reversing valve in the steering valve group, after the hydraulic oil in a control liquid path flows through the throttle valve, if the output flow of the steering oil pump is greater than the set flow of the throttle valve, pressure drop is formed at two ends of the throttle valve, and when the pressure drop is greater than the elastic force of an adjusting spring, the adjusting spring of the first reversing valve is compressed under the action of the pressure drop, the first reversing valve is in a left position, a hydraulic port of the steering oil pump is connected with an execution device, so that a steering loop normally works, and at the moment, a power source of a steering system only comprises the steering oil pump; if the output flow of the steering oil pump is not larger than the set flow of the throttle valve, the pressure drop formed at the two ends of the throttle valve is not enough to overcome the elasticity of an adjusting spring of a first reversing valve, the first reversing valve is positioned at the right position, a steering emergency pump oil pressure port is connected with an executing device, so that the emergency steering loop normally works, the steering oil pump is communicated with the emergency loop through the throttle valve, and the power source of the steering device is mainly the steering emergency pump.
Furthermore, an emergency lamp integrated circuit in the steering valve group can display whether the steering device has a fault, if the steering loop normally works, the first reversing valve is in the left position, high-pressure oil of the steering emergency pump passes through the second reversing valve, if the pressure drop formed at two ends of an oil inlet and an oil outlet of the second reversing valve in the control loop is larger than the elastic force of a spring, an adjusting spring of the second reversing valve is compressed under the action of the pressure drop, the second reversing valve is in the right position, the emergency lamp integrated circuit is driven to be switched off, an indicator lamp is not on, and the emergency pump unloads without a load; if the pressure drop formed at the two ends of the oil inlet and the oil outlet of the second reversing valve in the control loop is not larger than the elastic force of the spring, the pressure drop is not enough to overcome the elastic force of the adjusting spring of the second reversing valve, the adjusting spring pops up under the action of the elasticity of the adjusting spring, the second reversing valve is in the left position, the emergency lamp integrated circuit switch is closed, the indicator lamp is on, the steering emergency pump works with load at the moment, and meanwhile, the fault of the steering system is displayed.
According to the technical scheme, the invention has the following advantages:
1. the invention provides the function of all-wheel steering for the multi-axle heavy-duty vehicle, adopts a reasonable hydraulic control principle, provides steering power assistance for the front double-axle and the rear double-axle execution systems respectively through the steering loops, effectively solves the difficulties of heavy-duty vehicle such as heavy load and inconvenient steering, and realizes the function of all-wheel steering while meeting the requirement of the steering torque of the whole vehicle.
2. The emergency steering system has the emergency steering function, when the steering system works normally, the steering emergency pump does not have a load, hydraulic oil directly returns to the oil tank, the working of the active steering power-assisted system is not influenced, when the power of the whole vehicle fails, the emergency steering system can be automatically switched to an emergency steering state according to the pressure of a loop, the emergency pump works normally, the steering system of the vehicle can still work normally when an engine idles or is flameout, and the emergency steering system is sensitive in response, safe and reliable.
3. The steering system hydraulic control element has the characteristics of small volume, reaction speed block and small movement inertia, is not influenced by environment and is not influenced by control signals.
4. The invention has a modularized development direction, and theoretically, the steering hydraulic power assistance of two shafts can be increased by adding a steering loop in subsequent development, so that the all-wheel steering hydraulic power assistance of a multi-shaft vehicle can be realized without more cost, and the invention has a guiding function in the civil and military fields.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings used in the description will be briefly introduced, and it is obvious that the drawings in the following description are only some embodiments of the present invention, 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 of an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a valve block in an embodiment of the present invention;
FIG. 3 is a schematic view of the flow of oil in the steering circuit during normal operation of an embodiment of the present invention;
FIG. 4 is a schematic diagram of the flow of oil in the emergency circuit in the event of a steering system failure in accordance with an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a dual steering tank according to an embodiment of the present invention.
In the figure, 1, a first steering oil tank, 2, a second steering oil tank, 3, an oil suction connecting rubber tube, 4, an oil filter, 5, a steering oil pump, 6, a steering emergency pump, 7, a first overflow valve, 8, a flow dividing valve, 10, a steering valve group, 101, a first reversing valve, 102, a throttle valve, 103, a one-way valve, 104, a second reversing valve, 105, a second overflow valve, 106 and an emergency lamp integrated circuit.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the present embodiment, and it is apparent that the embodiments described below are only a part of embodiments 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 scope of protection of this patent.
Detailed description of the preferred embodiment 1
As shown in fig. 1 to 5, the present embodiment provides a hydraulic power steering device for a multi-axle vehicle, comprising an oil storage device, an oil supply device and an execution device which are connected together through hydraulic pipelines, wherein the oil storage device is a dual-steering oil tank configuration, the oil storage device comprises a steering oil tank 1, a steering oil tank 2 and an oil suction connecting rubber tube 3, and the steering oil tank 1 and the steering oil tank 2 are communicated through the oil suction connecting rubber tube 3. The side surfaces of the first steering oil tank 1 and the second steering oil tank 2 are respectively provided with an oil port with a bulge, the oil suction connecting rubber tube 3 is sleeved on the oil port with the bulge and then fixed through a clamp, so that an oil storage device of a communicator structure consisting of the first steering oil tank 1, the second steering oil tank 2 and the oil suction connecting rubber tube 3 is obtained, the oil storage device can be flexibly configured at the front part of a vehicle with a short arrangement space, the steering oil tanks can be separately arranged at proper positions and jointly provide hydraulic oil for an energy supply system, in addition, the contact area of the oil liquid and air is increased through the structure of the double steering oil tanks, the heat exchange between the oil liquid and the air is convenient, the oil temperature of the steering system is effectively reduced, the high-temperature oxidation of parts such as sealing rings is prevented, and the service lives of key parts are prolonged. An oil filter 4 with a replaceable valve core is integrated in the steering oil tank, and can be used for filtering impurities such as water rust, scrap iron and the like mixed in oil liquid and protecting precision elements such as a valve bank, a pump and the like in a steering system. The oil storage device plays a role in storing hydraulic oil and also has a heat dissipation function. The oil supply device comprises a normal oil supply pipeline, an emergency oil supply pipeline and a steering valve group 10, a steering oil pump 5 is arranged on the normal oil supply pipeline, the steering oil pump 5 is installed on an air compressor of the engine, a steering emergency pump 6, an overflow valve I7 and a flow dividing valve 8 are arranged on the emergency oil supply pipeline, the steering emergency pump 6 is installed on a gearbox, the normal oil supply pipeline is connected between the oil storage device and the steering valve group 10, the emergency oil supply pipeline is connected between the oil storage device and the steering valve group 10, and the steering valve group 10 is connected with an execution device. The high-pressure oil provided by the steering emergency pump 6 is averagely divided into two parts by the flow divider valve 8 and is respectively supplied to the steering loops of the front axle and the rear axle, and the overflow valve I7 plays a role of high-pressure overflow, so that the steering emergency pump 6 is effectively protected. The steering valve group 10 comprises a first reversing valve 101, a throttle valve 102, a one-way valve 103, a second reversing valve 104, a second overflow valve 105 and an emergency lamp integrated circuit 106, wherein a normal oil supply pipeline and an emergency oil supply pipeline are connected to the first reversing valve 101, the throttle valve 102 is connected to the first reversing valve 101 in parallel, the second reversing valve 104 is connected to the first reversing valve 101, the emergency lamp integrated circuit 106 is connected to the second reversing valve 104, the second overflow valve 105 is connected to a downstream pipeline of the first reversing valve 101 and the second reversing valve 104, and a downstream pipeline of the first reversing valve 101 and the second reversing valve 104 is connected to an execution device. Check valves 103 are installed in both the control loop and the main loop, so that the oil can be only conveyed in the forward direction and cannot flow back. The steering valve group 10 controls the position of a first reversing valve 101 according to the flow of hydraulic oil flowing through a throttle valve 102 in a control liquid path, and the steering loop and the emergency loop are quickly switched. The emergency lamp integrated circuit 106 is switched on and off by the oil flow control circuit flowing through the second reversing valve 104, and the emergency lamp is lightened when the steering system fails, so that the whole vehicle is convenient to maintain and overhaul.
In the scheme, an oil storage device, a steering oil pump 5, a steering valve group 10 and an actuating device form a steering loop by connecting oil pipes, two steering loops of a front axle and a rear axle are connected in parallel, and four groups of steering axles are controlled to move by the steering valve group 10; the oil storage device, the steering emergency pump 6, the flow divider 8, the overflow valve I7, the steering valve group 10 and the execution device form an emergency steering loop through connecting oil pipes. When the steering loop has a fault, the steering valve group 10 is automatically switched to the emergency steering loop, so that the steering device is ensured to supply oil stably and smoothly, and the safety and reliability of the steering system are effectively ensured.
Detailed description of the preferred embodiment 2
As shown in fig. 1 to 5, the present embodiment provides a hydraulic power steering system for a multi-axle vehicle, including an oil storage device, an oil supply device and an execution device which are connected together by hydraulic pipelines, wherein the oil supply device includes a normal oil supply pipeline, an emergency oil supply pipeline and a steering valve group 10, oil is supplied through the normal oil supply pipeline during normal operation, and oil is supplied through the emergency oil supply pipeline during failure; the steering valve group 10 is mainly integrated through a first reversing valve 101, a throttle valve 102, a one-way valve 103, a second reversing valve 104, a second overflow valve 105 and an emergency lamp integrated circuit 106, when the steering device normally works, a steering oil pump 5 sucks hydraulic oil from an oil storage device, the obtained high-pressure oil enters the first reversing valve 101 in the steering valve group 10, after the hydraulic oil in a control liquid path flows through the throttle valve 102, if the output flow of the steering oil pump 5 is greater than the set flow of the throttle valve 102, pressure drop is formed at two ends of the throttle valve 102, and when the pressure drop is greater than the elastic force of an adjusting spring, the adjusting spring of the first reversing valve 101 is compressed under the action of the pressure drop, the first reversing valve 101 is in a left position, an oil pressure port of the steering oil pump 5 is connected with an execution device, so that the steering circuit normally works, and at the moment, the power source of the steering system only has the steering oil pump 5; if the output flow of the steering oil pump 5 is not larger than the set flow of the throttle valve 102, the pressure drop formed at two ends of the throttle valve 102 is not enough to overcome the elastic force of an adjusting spring of the first reversing valve 101, the first reversing valve 101 is positioned at the right position, the oil pressing port of the steering emergency pump 6 is connected with the executing device, so that the emergency steering loop normally works, the steering oil pump 5 is communicated with the emergency loop through the throttle valve 102, and the power source of the steering device mainly turns to the emergency pump 6 at the moment. The emergency lamp integrated circuit 106 in the steering valve group 10 can display whether the steering device has a fault, if the steering loop works normally, the first reversing valve 101 is in the left position, high-pressure oil of the steering emergency pump 6 passes through the second reversing valve 104, if the pressure drop formed at the two ends of the oil inlet and the oil outlet of the second reversing valve 104 in the control loop is larger than the elastic force of a spring, an adjusting spring of the second reversing valve 104 is compressed under the action of the pressure drop, the second reversing valve 104 is in the right position, the emergency lamp integrated circuit 106 is driven to be switched off, the indicator lamp is not on, and the emergency pump unloads without load; if the pressure drop formed at the two ends of the oil inlet and the oil outlet of the second reversing valve 104 in the control loop is not larger than the elastic force of the spring, the pressure drop is not enough to overcome the elastic force of the adjusting spring of the second reversing valve 104, the adjusting spring is popped up under the action of the elasticity of the adjusting spring, the second reversing valve 104 is in the left position, the switch of the emergency lamp integrated circuit 106 is closed, the indicator lamp is on, the steering emergency pump 6 works with load at the moment, and meanwhile, the fault of the steering system is displayed. Be provided with on the normal oil supply pipeline and turn to oil pump 5, turn to oil pump 5 and install on the air compressor machine of engine, be provided with on the emergent oil supply pipeline and turn to emergency pump 6, overflow valve 7, flow divider 8, turn to emergency pump 6 and install on the gearbox, normally supply oil pipe connection between oil storage device and valve group 10, emergent oil supply pipe connection is between oil storage device and valve group 10, valve group 10 is connected with the final controlling element. The first steering oil pump 5 sucks oil from the oil storage device and conveys high-pressure oil to the steering valve group 10, and the steering valve group 10 judges whether the emergency loop is opened or not according to the pressure of the flowing oil and conveys the high-pressure oil to the execution device. The steering oil pump 5 is installed on an air compressor of an engine, the air compressor drives the steering oil pump 5 to supply oil when the engine works, the steering emergency pump 6 is installed on a gearbox, and when the steering oil pump 5 breaks down, the gearbox can drive the steering emergency pump 6 to supply oil.
In the embodiment, taking a four-axle vehicle as an example, the whole vehicle comprises two identical steering loops and an emergency steering loop, the loops are all provided with an oil source by an oil storage system, and a steering valve group 10 in the oil storage system controls a steering oil pump 5 or a steering emergency pump 6 to work according to the level of oil pressure so as to enter a normal steering state or an emergency steering state. According to the principle of the invention, one steering loop can control two steering axles to steer, so that more steering axles can steer theoretically by adding the steering loops, thereby realizing the all-wheel steering of a multi-axle vehicle type.
The terms "upper", "lower", "outside", "inside", and the like in the description and claims of the present invention and the above-described drawings (if any) are used for distinguishing relative positions without necessarily being construed qualitatively. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. The utility model provides an automobile-used hydraulic pressure power assisted steering device of multiaxis, its characterized in that includes oil storage device, oil supply unit and the final controlling element that links together through hydraulic line, oil supply unit includes and normally supplies oil pipe way, emergent oil pipe way and steering valve group, is provided with the steering oil pump on the normal oil pipe way, and the steering oil pump is installed on the air compressor machine of engine, is provided with on the emergent oil pipe way and turns to emergency pump, overflow valve one, flow divider, and the emergency pump that turns to is installed on the gearbox, and the normal oil pipe way that supplies is connected between oil storage device and steering valve group, and emergent oil pipe way connection is between oil storage device and steering valve group, and steering valve group and final controlling element are connected.
2. The hydraulic power steering apparatus for a multi-axle vehicle according to claim 1, wherein the steering valve group includes a first direction valve, a throttle valve, a check valve, a second direction valve, a second overflow valve, and an emergency light integrated circuit, the normal oil supply line and the emergency oil supply line are connected to the first direction valve, the throttle valve is connected in parallel to the first direction valve, the second direction valve is connected to the first direction valve, the emergency light integrated circuit is connected to the second direction valve, the second overflow valve is connected to a downstream line of the first direction valve and the second direction valve, and a downstream line of the first direction valve and the second direction valve is connected to the actuator.
3. The hydraulic power steering apparatus for a multi-axle vehicle according to claim 1 or 2, wherein the oil storage means includes a first steering oil tank, a second steering oil tank, and an oil suction connection hose, and the first steering oil tank and the second steering oil tank are connected through the oil suction connection hose.
4. The hydraulic power steering device for the multi-axle vehicle according to claim 1 or 2, wherein the oil storage device, the steering oil pump, the steering valve group and the actuator constitute a steering loop through connecting oil pipes, and the oil storage device, the steering emergency pump, the flow divider valve, the first overflow valve, the steering valve group and the actuator constitute an emergency steering loop through connecting oil pipes.
5. The hydraulic power steering apparatus for a multi-axle vehicle according to claim 1, wherein a check valve is provided in the hydraulic line.
6. A multi-shaft hydraulic steering power-assisted system for a vehicle is characterized by comprising an oil storage device, an oil supply device and an execution device which are connected together through hydraulic pipelines, wherein the oil supply device comprises a normal oil supply pipeline, an emergency oil supply pipeline and a steering valve group; when the steering device normally works, a normal oil supply pipeline sucks hydraulic oil out of the oil storage device, the obtained high-pressure oil enters the first reversing valve in the steering valve group, after the hydraulic oil in a control liquid path flows through the throttling valve, if the output flow of the normal oil supply pipeline is greater than the set flow of the throttling valve, pressure drop is formed at two ends of the throttling valve, and when the pressure drop is greater than the elastic force of an adjusting spring, the adjusting spring of the first reversing valve is compressed under the action of the pressure drop, and the first reversing valve is in a left position, so that the steering loop normally works; if the output flow of the normal oil supply pipeline is not larger than the set flow of the throttle valve, the pressure drop formed at the two ends of the throttle valve is not enough to overcome the elastic force of a regulating spring of a first reversing valve, the first reversing valve is positioned at the right position, so that the emergency steering loop normally works, and at the moment, the power source of the steering device mainly comprises a steering emergency pump.
7. The hydraulic power steering system for a multi-axle vehicle as claimed in claim 6, wherein a steering oil pump is installed on the normal oil supply line, the steering oil pump is installed on an air compressor of the engine, a steering emergency pump, a first overflow valve and a flow divider are installed on the emergency oil supply line, the steering emergency pump is installed on the transmission, the normal oil supply line is connected between the oil storage device and the steering valve group, the emergency oil supply line is connected between the oil storage device and the steering valve group, the steering valve group is connected with the actuator, the steering oil pump sucks oil from the oil storage device to deliver high-pressure oil to the steering valve group, the steering valve group judges whether the emergency circuit is opened or not by flowing oil pressure, and high-pressure oil is conveyed to an execution device, when the engine works, the press drives a steering oil pump to supply oil, and when the steering oil pump fails, the gearbox can drive a steering emergency pump to supply oil.
8. The hydraulic power steering system for the multi-axle vehicle as claimed in claim 7, wherein the emergency light integrated circuit in the steering valve set can indicate whether the steering device is in fault, if the steering loop is working normally, the first reversing valve is in left position, the high pressure oil of the steering emergency pump will pass through the second reversing valve, if the pressure drop formed at the two ends of the oil inlet and outlet of the second reversing valve in the control loop is larger than the spring force, the adjusting spring of the second reversing valve is compressed under the action of the pressure drop, the second reversing valve is in right position, the emergency light integrated circuit is driven to switch off, the indicator light is not on, and the emergency pump is unloaded without load; if the pressure drop formed at the two ends of the oil inlet and the oil outlet of the second reversing valve in the control loop is not larger than the elastic force of the spring, the pressure drop is not enough to overcome the elastic force of the adjusting spring of the second reversing valve, the adjusting spring pops up under the action of the elasticity of the adjusting spring, the second reversing valve is in the left position, the emergency lamp integrated circuit switch is closed, the indicator lamp is on, the steering emergency pump works with load at the moment, and meanwhile, the fault of the steering system is displayed.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210022104.7A CN114312994B (en) | 2022-01-10 | 2022-01-10 | Hydraulic steering power assisting device and system for multi-shaft vehicle |
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| CN202210022104.7A CN114312994B (en) | 2022-01-10 | 2022-01-10 | Hydraulic steering power assisting device and system for multi-shaft vehicle |
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| CN114312994A true CN114312994A (en) | 2022-04-12 |
| CN114312994B CN114312994B (en) | 2023-04-11 |
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