CN111824259A - Axle centering control system and crane - Google Patents
Axle centering control system and crane Download PDFInfo
- Publication number
- CN111824259A CN111824259A CN202010754777.2A CN202010754777A CN111824259A CN 111824259 A CN111824259 A CN 111824259A CN 202010754777 A CN202010754777 A CN 202010754777A CN 111824259 A CN111824259 A CN 111824259A
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- oil
- centering
- control system
- hydraulic oil
- valve
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D7/00—Steering linkage; Stub axles or their mountings
- B62D7/06—Steering linkage; Stub axles or their mountings for individually-pivoted wheels, e.g. on king-pins
- B62D7/14—Steering linkage; Stub axles or their mountings for individually-pivoted wheels, e.g. on king-pins the pivotal axes being situated in more than one plane transverse to the longitudinal centre line of the vehicle, e.g. all-wheel steering
- B62D7/142—Steering linkage; Stub axles or their mountings for individually-pivoted wheels, e.g. on king-pins the pivotal axes being situated in more than one plane transverse to the longitudinal centre line of the vehicle, e.g. all-wheel steering specially adapted for particular vehicles, e.g. tractors, carts, earth-moving vehicles, trucks
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D7/00—Steering linkage; Stub axles or their mountings
- B62D7/06—Steering linkage; Stub axles or their mountings for individually-pivoted wheels, e.g. on king-pins
- B62D7/14—Steering linkage; Stub axles or their mountings for individually-pivoted wheels, e.g. on king-pins the pivotal axes being situated in more than one plane transverse to the longitudinal centre line of the vehicle, e.g. all-wheel steering
- B62D7/15—Steering linkage; Stub axles or their mountings for individually-pivoted wheels, e.g. on king-pins the pivotal axes being situated in more than one plane transverse to the longitudinal centre line of the vehicle, e.g. all-wheel steering characterised by means varying the ratio between the steering angles of the steered wheels
- B62D7/1554—Steering linkage; Stub axles or their mountings for individually-pivoted wheels, e.g. on king-pins the pivotal axes being situated in more than one plane transverse to the longitudinal centre line of the vehicle, e.g. all-wheel steering characterised by means varying the ratio between the steering angles of the steered wheels comprising a fluid interconnecting system between the steering control means of the different axles
- B62D7/1572—Steering linkage; Stub axles or their mountings for individually-pivoted wheels, e.g. on king-pins the pivotal axes being situated in more than one plane transverse to the longitudinal centre line of the vehicle, e.g. all-wheel steering characterised by means varying the ratio between the steering angles of the steered wheels comprising a fluid interconnecting system between the steering control means of the different axles provided with electro-hydraulic control means
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Vehicle Body Suspensions (AREA)
Abstract
The invention provides an axle centering control system and a crane, and relates to the technical field of engineering machinery, wherein the axle centering control system comprises a reversing valve, a centering oil cylinder and a hydraulic oil control assembly; an oil inlet branch is connected to an oil inlet of the reversing valve, an energy accumulator is arranged on the oil inlet branch, and an oil outlet of the reversing valve is connected with an oil tank; the port C of the centering oil cylinder is connected with the working port of the reversing valve, and the port T of the centering oil cylinder is connected with the oil tank; the hydraulic oil control assembly comprises a pressure sensor and a controller, the pressure sensor is used for collecting hydraulic oil data of the energy accumulator and transmitting the hydraulic oil data to the controller, and the controller receives the hydraulic oil data and controls the hydraulic oil pressure of the energy accumulator according to a preset value. The crane includes an axle centering control system. Through this axle centering control system, the hydraulic system who exists has solved among the prior art can't monitor hydraulic oil pressure information, probably causes hydraulic oil loss and harm vehicle driving safety's technical problem.
Description
Technical Field
The invention relates to the technical field of engineering machinery, in particular to an axle centering control system and a crane.
Background
At present, engineering vehicles develop towards a heavy load direction, and with the increase of vehicle bodies and the increase of the number of axles, the flexibility of the vehicles is met by means of multi-axle steering. The electro-hydraulic control of the steering of the rear axle is more and more widely applied because the electro-hydraulic control can flexibly realize various steering modes of the vehicle. On the other hand, the steering system is important for vehicle safety and needs to satisfy high speed stability.
Generally, steering systems have a variety of configurations; among them, a hydraulic steering system using hydraulic pressure as power is widely used in various vehicles, particularly in engineering vehicles, based on safety and reliability of a hydraulic system.
However, when a pipeline leaks oil or bursts seriously during the running of the vehicle, the oil source can always charge the energy accumulator, so that hydraulic oil loss is caused, and the running safety of the vehicle can be damaged.
Disclosure of Invention
The invention aims to provide an axle centering control system and a crane, which are used for solving the technical problems that hydraulic oil loss and vehicle running safety damage are possibly caused because a hydraulic system in the prior art cannot monitor hydraulic oil pressure information.
In a first aspect, an embodiment of the present invention provides an axle centering control system, including: the hydraulic oil control system comprises a reversing valve, a centering oil cylinder and a hydraulic oil control assembly;
an oil inlet branch is connected to an oil inlet of the reversing valve, an energy accumulator is arranged on the oil inlet branch, and an oil outlet of the reversing valve is connected with an oil tank;
the port C of the centering oil cylinder is connected with the working port of the reversing valve, and the port T of the centering oil cylinder is connected with the oil tank;
the hydraulic oil control assembly comprises a pressure sensor and a controller which are connected, wherein the pressure sensor is used for acquiring hydraulic oil data of the energy accumulator and transmitting the hydraulic oil data to the controller, so that the controller receives the hydraulic oil data and controls the hydraulic oil pressure of the energy accumulator according to a preset value.
Further, the preset values comprise SP1, SP2 and SP3, wherein the numerical values of SP1, SP2 and SP3 are reduced in sequence;
one end of the oil inlet branch is connected with an oil source, and when the hydraulic oil data is higher than SP1, the controller controls the oil source to unload and stops filling the energy accumulator;
when the hydraulic oil data is lower than SP2 and higher than SP3, the controller controls the oil source to build pressure and charge the accumulator;
when the hydraulic oil data is lower than SP3, the controller controls the alarm element to alarm and/or force the vehicle to run at a reduced speed.
Further, the pressure sensor is connected to the oil inlet branch.
Furthermore, the reversing valve adopts a two-position three-way valve or a two-position four-way valve.
Further, the axle centering control system further comprises an unloading branch circuit for unloading the energy accumulator.
Furthermore, an unloading valve is arranged on the unloading branch;
the oil inlet of the unloading valve is connected with the energy accumulator, and the oil outlet of the unloading valve is connected with the oil tank.
Furthermore, the unloading valve adopts an overflow valve or a stop valve.
Furthermore, a one-way valve is further arranged on the oil inlet branch.
Furthermore, the centering oil cylinders of the plurality of axles are correspondingly provided with one reversing valve, and the working ports of the reversing valves are respectively connected with the port C of the centering oil cylinder through a plurality of first branches; or the centering oil cylinder of a single axle is correspondingly provided with one reversing valve, and the oil inlet branch is respectively connected with the oil inlet of the reversing valve through a plurality of second branches.
Has the advantages that:
according to the axle centering control system provided by the invention, as the oil inlet of the reversing valve is connected with the oil inlet branch, the C port of the centering oil cylinder is connected with the working port of the reversing valve, and the T port of the centering oil cylinder is connected with the oil tank, on one hand, the pressure build-up of the corresponding cavity of the centering oil cylinder can be realized, and the axle centering is forced; on the other hand, unloading of the corresponding cavity of the centering oil cylinder can be realized, so that the axle is in a free state and can be steered at any time.
The axle centering control system also comprises a hydraulic oil control assembly, wherein the pressure sensor is used for acquiring hydraulic oil data of the energy accumulator and transmitting the hydraulic oil data to the controller, the controller receives the hydraulic oil data for calculation, and the hydraulic oil data is compared with a preset value to control the hydraulic oil pressure of the energy accumulator so as to carry out reasonable liquid filling or stop liquid filling on the energy accumulator, so that the loss of the hydraulic oil is reduced as much as possible, and the driving safety of a vehicle is guaranteed.
In a second aspect, an embodiment of the present invention provides a crane, including: the axle centering control system of any one of the preceding embodiments.
Has the advantages that:
the crane provided by the invention comprises the axle centering control system, so that the technical advantages and effects achieved by the crane also comprise the technical advantages and effects achieved by the axle centering control system, and the details are not repeated herein.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic diagram of an axle centering control system according to an embodiment of the present invention, wherein an axle is in a forced centering state;
FIG. 2 is a second schematic diagram of an axle centering control system according to an embodiment of the present invention, wherein the axle is in an unloaded steering state;
fig. 3 is a third schematic diagram of an axle centering control system according to an embodiment of the present invention, wherein one of the centering cylinders is provided with one of the directional valves.
Icon:
10-vehicle axle;
100-a reversing valve; 200-centering the oil cylinder; 300-an accumulator; 400-oil tank; 500-a pressure sensor; 600-relief valves; 700-one-way valve.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Some embodiments of the invention are described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.
The invention provides an axle centering control system, which comprises a reversing valve 100, a centering oil cylinder 200 and a hydraulic oil control assembly, wherein the reversing valve is arranged on the axle centering control system; an oil inlet branch is connected to an oil inlet of the reversing valve 100, an energy accumulator 300 is arranged on the oil inlet branch, and an oil outlet of the reversing valve 100 is connected with an oil tank 400; the C port of the centering oil cylinder is connected with the working port of the reversing valve 100, and the T port of the centering oil cylinder 200 is connected with the oil tank 400; the hydraulic oil control assembly includes a pressure sensor 500 and a controller (not shown in the drawings), which are connected to each other, where the pressure sensor 500 is configured to collect hydraulic oil data (i.e., hydraulic oil pressure data) of the energy accumulator 300 and transmit the hydraulic oil data to the controller, so that the controller receives the hydraulic oil data and controls the hydraulic oil pressure of the energy accumulator 300 according to a preset value.
In the axle centering control system provided by the embodiment, as the oil inlet of the reversing valve 100 is connected with the oil inlet branch, the C port of the centering oil cylinder 200 is connected with the working port of the reversing valve 100, and the T port of the centering oil cylinder 200 is connected with the oil tank 400, on one hand, the pressure build-up of the corresponding cavity of the centering oil cylinder 200 can be realized, and the axle 10 is forced to be centered; on the other hand, unloading of the corresponding cavity of the centering cylinder 200 can be realized, so that the axle 10 is in a free state and can be steered at any time.
The axle centering control system further comprises a hydraulic oil control component, the pressure sensor is used for collecting hydraulic oil data of the energy accumulator 300 and transmitting the hydraulic oil data to the controller, the controller receives the hydraulic oil data for calculation, the hydraulic oil pressure of the energy accumulator 300 is controlled through comparison with a preset value, reasonable liquid filling or liquid stopping of the energy accumulator 300 is carried out, hydraulic oil loss is reduced as far as possible, and safety of vehicle driving is guaranteed.
In addition, compared with the prior art, the axle centering control system omits a hydraulic control one-way valve, namely hydraulic elements and pipelines are reduced, so that the failure rate of the system is reduced.
The accumulator 300 may maintain pressure in addition to providing an oil source to the centering cylinder 200.
The centering cylinder 200 may be of known construction and has at least three chambers: the rod cavity, the rodless cavity and the middle cavity are communicated with the port C, and the middle cavity is communicated with the port T; the centering cylinder 200 has two states, one is an axle forced centering state, and the other is an axle unloading and steering state. In a first state, as shown in fig. 1, the oil inlet of the reversing valve 100 is communicated with the working port of the reversing valve 100, and the working port of the reversing valve 100 is communicated with the port C; in the second state, as shown in fig. 2, the oil return port of the direction valve 100 is connected to the working port of the direction valve 100, the working port of the direction valve 100 is communicated with the port C, and in both states, the port T is always communicated with the oil tank.
As shown in fig. 1 and 2, arrows in fig. 1 and 2 indicate the flow direction of hydraulic oil. Specifically, when the electromagnet DT of the reversing valve 100 is powered on, hydraulic oil of the accumulator 300 enters the port C through the reversing valve 100, and then enters the rod cavity and the rodless cavity of the centering oil cylinder 200, the rod cavity and the rodless cavity of the centering oil cylinder 200 build pressure, and the axle 10 is forced to be centered; when the electromagnet DT of the reversing valve 100 is de-energized, the hydraulic oil in the rod cavity and the rodless cavity of the centering oil cylinder 200 flows back to the oil tank 400 through the port C and then through the reversing valve 100, the centering oil cylinder 200 is unloaded, the axle 10 is in a free state, and the steering can be performed at any time.
Further, the preset values include SP1, SP2 and SP3, wherein the values of SP1, SP2 and SP3 are reduced in sequence; one end of the oil inlet branch is connected with an oil source, and when the hydraulic oil data is higher than SP1, the controller controls the oil source to unload and stops filling the energy accumulator 300; when the hydraulic oil data is lower than SP2 and higher than SP3, the controller controls the oil source to build pressure and charge the accumulator 300; when the hydraulic oil data is lower than SP3, the controller controls the alarm element to alarm and/or force the vehicle to run at a reduced speed.
Specifically, SP1 is high pressure, SP2 is low pressure, and SP3 is ultra low pressure. When the hydraulic oil pressure of the accumulator 300 is lower than the ultra-low pressure SP3, the pressure sensor 500 sends a signal to alarm and forces the vehicle to decelerate, so that the safety and reliability of the vehicle running are ensured, a driver can be reminded that the hydraulic system of the vehicle gets off has a fault, and the loss caused by the fault is reduced as much as possible.
As shown in fig. 1 or fig. 2, a pressure sensor 500 is connected to the oil intake branch.
Alternatively, the directional valve 100 may be a two-position three-way valve, a two-position four-way valve, or other type of hydraulic control valve.
When the directional control valve 100 employs a two-position, four-way valve, one of the working ports may not operate, i.e., may not function.
The two-position three-way valve or the two-position four-way valve may be of a known structure, and the direction valve 100 shown in fig. 1 to 3 is a two-position three-way valve.
On the basis of the above embodiment, the axle centering control system further includes an unloading branch for unloading the energy accumulator 300, so that the energy accumulator 300 can be unloaded when the axle centering control system is overhauled (for example, when a valve is disassembled and assembled), and a safety protection effect is achieved.
In one embodiment of the application, the unloading branch is provided with an unloading valve; the oil inlet of the unloading valve is connected with the energy accumulator 300, and the oil outlet of the unloading valve is connected with the oil tank 400.
Alternatively, the relief valve may employ the relief valve 600 or a stop valve.
As shown in fig. 1 or fig. 2, a check valve 700 is further disposed on the oil inlet branch, and the check valve 700 can maintain pressure of the oil source in the accumulator 300.
Further, a reversing valve 100 is correspondingly arranged on the centering cylinders 200 of the plurality of axles 10, and the working ports of the reversing valve 100 are respectively connected with ports C of the centering cylinders 200 through a plurality of first branches (see fig. 1 or fig. 2 in particular); or, a single centering oil cylinder 200 is correspondingly provided with one reversing valve 100, and the oil inlet branch is respectively connected with the oil inlet of the reversing valve 100 through a plurality of second branches (see fig. 3 in particular).
The number of the axles 10 shown in fig. 1 to 3 is two, but is not limited to two, and may be three, four, and the like.
Specifically, for the case that one reversing valve 100 is correspondingly arranged in the centering oil cylinders 200 of the plurality of axles 10, when the electromagnet DT of the reversing valve 100 is powered on, as shown in fig. 1, the reversing valve 100 is located at the right position, hydraulic oil of the energy accumulator 300 sequentially passes through an oil inlet, a working port and a plurality of first branches of the reversing valve 100 and respectively enters a port C of the reversing valve 100, and then respectively enters a rod cavity and a rodless cavity of the centering oil cylinder 200, and the rod cavity and the rodless cavity of the centering oil cylinder 200 are pressurized to force the two axles 10 to be centered; when the electromagnet DT of the reversing valve 100 is de-energized, as shown in fig. 2, the reversing valve 100 is in the left position, the hydraulic oil in the rod cavity and the rodless cavity of the centering oil cylinder 200 of the two axles 10 respectively passes through the C port, and then sequentially flows back to the oil tank 400 through the working port and the oil outlet of the reversing valve 100, the centering oil cylinder 200 is unloaded, the axle 10 is in a free state, and the steering can be performed at any time.
Specifically, for the case that a single centering cylinder 200 is correspondingly provided with one reversing valve 100, as shown in fig. 3, when the electromagnet DT of the reversing valve 100 is powered on, the reversing valve 100 is in the right position, hydraulic oil of the energy accumulator 300 respectively enters the port C of the reversing valve 100 through the second branch, the oil inlet and the working port of the respective reversing valve 100, and then respectively enters the rod cavity and the rodless cavity of the centering cylinder 200, the rod cavity and the rodless cavity of the centering cylinder 200 are pressurized, and the two axles 10 are forced to be centered; when the electromagnet DT of the reversing valve 100 is de-energized, the reversing valve 100 is in the left position, the hydraulic oil in the rod cavity and the rodless cavity of the centering oil cylinder 200 of the two axles 10 passes through the C port and then sequentially flows back to the oil tank 400 through the working port and the oil outlet of the respective reversing valve 100, the centering oil cylinder 200 is unloaded, the axle 10 is in a free state, and the steering can be performed at any time.
The present embodiments provide a crane that includes an axle centering control system. The crane provided by the invention comprises the axle centering control system, so that the technical advantages and effects achieved by the crane also comprise the technical advantages and effects achieved by the axle centering control system, and the details are not repeated herein.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. An axle centering control system, comprising: the hydraulic oil control system comprises a reversing valve, a centering oil cylinder and a hydraulic oil control assembly;
an oil inlet branch is connected to an oil inlet of the reversing valve, an energy accumulator is arranged on the oil inlet branch, and an oil outlet of the reversing valve is connected with an oil tank;
the port C of the centering oil cylinder is connected with the working port of the reversing valve, and the port T of the centering oil cylinder is connected with the oil tank;
the hydraulic oil control assembly comprises a pressure sensor and a controller which are connected, wherein the pressure sensor is used for collecting hydraulic oil data of the energy accumulator and transmitting the hydraulic oil data to the controller, so that the controller receives the hydraulic oil data and controls the hydraulic oil pressure of the energy accumulator according to a preset value.
2. The axle centering control system of claim 1, wherein the preset values comprise SP1, SP2, and SP3, wherein the values of SP1, SP2, and SP3 decrease in sequence;
one end of the oil inlet branch is connected with an oil source, and when the hydraulic oil data is higher than SP1, the controller controls the oil source to unload and stops filling the energy accumulator;
when the hydraulic oil data is lower than SP2 and higher than SP3, the controller controls the oil source to build pressure and charge the accumulator;
when the hydraulic oil data is lower than SP3, the controller controls the alarm element to alarm and/or force the vehicle to run at a reduced speed.
3. The axle centering control system of claim 1, wherein the pressure sensor is connected to the oil feed branch.
4. The axle centering control system of claim 1, wherein the directional control valve is a two-position three-way valve or a two-position four-way valve.
5. The axle centering control system of claim 1, further comprising an unloading branch for unloading the accumulator.
6. The axle centering control system according to claim 5, wherein an unloading valve is arranged on the unloading branch;
the oil inlet of the unloading valve is connected with the energy accumulator, and the oil outlet of the unloading valve is connected with the oil tank.
7. The axle centering control system of claim 6, wherein the unloading valve is an overflow valve or a stop valve.
8. The axle centering control system of claim 1, wherein a check valve is further disposed on the oil inlet branch.
9. The axle centering control system according to any one of claims 1 to 8, wherein one reversing valve is arranged corresponding to the centering oil cylinders of a plurality of axles, and working ports of the reversing valves are respectively connected with ports C of the centering oil cylinders through a plurality of first branches; or the centering oil cylinder of a single axle is correspondingly provided with one reversing valve, and the oil inlet branch is respectively connected with the oil inlet of the reversing valve through a plurality of second branches.
10. A crane, comprising: the axle centering control system of any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010754777.2A CN111824259A (en) | 2020-07-30 | 2020-07-30 | Axle centering control system and crane |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010754777.2A CN111824259A (en) | 2020-07-30 | 2020-07-30 | Axle centering control system and crane |
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| CN111824259A true CN111824259A (en) | 2020-10-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010754777.2A Pending CN111824259A (en) | 2020-07-30 | 2020-07-30 | Axle centering control system and crane |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5097808A (en) * | 1989-09-07 | 1992-03-24 | Mazda Motor Corporation | Engine control system for internal combustion engine |
| JP2001138946A (en) * | 1999-10-13 | 2001-05-22 | Deere & Co | Auxiliary charge for hydraulic steering system |
| CN1530271A (en) * | 2002-12-18 | 2004-09-22 | ��ʽ��������Զ�֯�������� | Steering gear of industrial electric vehicle |
| CN102951198A (en) * | 2012-11-14 | 2013-03-06 | 三一重工股份有限公司 | Vehicle and hydraulic steering driving system |
| CN107010108A (en) * | 2017-05-02 | 2017-08-04 | 山东五征集团有限公司 | Electric-controlled hydraulic four-wheel steering system and forward method |
| CN109249918A (en) * | 2018-09-26 | 2019-01-22 | 三汽车制造有限公司 | Brake fluid system and vehicle |
-
2020
- 2020-07-30 CN CN202010754777.2A patent/CN111824259A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5097808A (en) * | 1989-09-07 | 1992-03-24 | Mazda Motor Corporation | Engine control system for internal combustion engine |
| JP2001138946A (en) * | 1999-10-13 | 2001-05-22 | Deere & Co | Auxiliary charge for hydraulic steering system |
| CN1530271A (en) * | 2002-12-18 | 2004-09-22 | ��ʽ��������Զ�֯�������� | Steering gear of industrial electric vehicle |
| CN102951198A (en) * | 2012-11-14 | 2013-03-06 | 三一重工股份有限公司 | Vehicle and hydraulic steering driving system |
| CN107010108A (en) * | 2017-05-02 | 2017-08-04 | 山东五征集团有限公司 | Electric-controlled hydraulic four-wheel steering system and forward method |
| CN109249918A (en) * | 2018-09-26 | 2019-01-22 | 三汽车制造有限公司 | Brake fluid system and vehicle |
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Application publication date: 20201027 |