CN213502251U - Emergency brake hydraulic system - Google Patents
Emergency brake hydraulic system Download PDFInfo
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- CN213502251U CN213502251U CN202021995244.5U CN202021995244U CN213502251U CN 213502251 U CN213502251 U CN 213502251U CN 202021995244 U CN202021995244 U CN 202021995244U CN 213502251 U CN213502251 U CN 213502251U
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Abstract
The utility model provides an emergency braking hydraulic system, including drive arrangement, hydraulic pump and the oil supplementing pump of establishing ties in proper order, still include motor, parking brake, guide's formula liquid accuse switching-over valve and shuttle valve, two oil-outs of hydraulic pump respectively through first hydraulic pressure pipe and second hydraulic pressure pipe with two oil inlets of motor are connected, the first oil inlet and the first hydraulic pressure union coupling of shuttle valve, the second oil inlet and the second hydraulic pressure union coupling of shuttle valve, the oil-out and the guide's oil mouth of guide's formula hydraulic pressure switching-over valve of shuttle valve are connected; when the parking brake is normally moved, the shuttle valve automatically controls the reversing by leading the high-pressure oil of the hydraulic pump to the control cavity of the pilot-operated hydraulic control reversing valve to realize the release of the parking brake; when the first hydraulic pipe or the second hydraulic pipe bursts, the pilot control pressure of the pilot type hydraulic control reversing valve is reduced, the valve core reset spring pushes the valve core to reset quickly, the control pressure oil of the parking brake is unloaded to realize emergency braking automatically, and the safety braking under emergency is ensured by the arrangement of the shuttle valve.
Description
Technical Field
The utility model relates to a hydraulic braking system technical field of vehicle, concretely relates to emergency braking hydraulic system.
Background
The conventional hydrostatic traveling machine is generally provided with a parking brake system, the parking brake system is used as an emergency brake to ensure the driving safety, the conventional emergency brake system generally controls an electromagnetic directional valve through an electric signal to realize the parking brake and the release of the parking brake, but the emergency brake is realized under the condition that a hydraulic pipeline between a hydraulic pump and a motor driving wheels to rotate bursts under the emergency condition, the emergency brake can be realized only by installing an emergency stop switch (or a button) on a remote controller or a cab through the control mode of controlling the electromagnetic directional valve through the electric signal, and the electromagnetic directional valve is forcibly de-energized by pressing the emergency stop switch (or the button) so as to unload control pressure oil of the parking brake, but once the control signal of the electromagnetic directional valve fails, the emergency brake cannot be realized, and safety accidents are easily caused.
Therefore, there is a need for an emergency braking hydraulic system that can safely perform emergency braking in the event of a burst of hydraulic lines between the hydraulic pump and the motor.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome prior art's not enough, provide an emergency braking hydraulic system, can be under the emergency that the hydraulic pressure pipeline between hydraulic pump and motor bursts can safe emergency braking.
In order to achieve the above object, the present invention provides an emergency braking hydraulic system, including a driving device, a hydraulic pump and an oil supplementing pump which are connected in series in sequence, further including a motor for driving wheels, a parking brake, a pilot-operated hydraulic control directional control valve for controlling parking braking and a shuttle valve, wherein the oil supplementing pump is used for supplying cooling oil to the hydraulic pump, the hydraulic pump has two oil outlets, the two oil outlets are respectively connected with two oil inlets of the motor through a first hydraulic pipe and a second hydraulic pipe, a first oil inlet of the shuttle valve is connected with the first hydraulic pipe, a second oil inlet of the shuttle valve is connected with the second hydraulic pipe, and an oil outlet of the shuttle valve is connected with a pilot oil port of the pilot-operated hydraulic directional control valve; when the parking brake is normally moved, the shuttle valve automatically controls the reversing of the pilot-operated type hydraulic control reversing valve to realize the releasing of the parking brake by leading high-pressure oil at the oil outlet of the hydraulic pump to a control cavity of the pilot-operated type hydraulic control reversing valve; when the first hydraulic pipe or the second hydraulic pipe bursts, the pilot control pressure of the pilot type hydraulic control reversing valve is immediately reduced, at the moment, the valve core reset spring of the pilot type hydraulic control reversing valve pushes the valve core to reset quickly, and the emergency brake is automatically realized by unloading the control pressure oil of the parking brake.
As a further improvement of the above scheme, the emergency braking hydraulic system further comprises a filter connected to an oil outlet of the oil supply pump, an overflow valve connected to the filter, a first oil-supply safety valve and a second oil-supply safety valve, wherein an oil inlet of the first oil-supply safety valve is connected to the filter, and an oil outlet of the first oil-supply safety valve is connected to the first hydraulic pipe; an oil inlet of the second oil supplementing safety valve is connected with the filter, and an oil outlet of the second oil supplementing safety valve is connected with the second hydraulic pipe.
As a further improvement of the above scheme, a set pressure value of a valve core return spring of the pilot-operated hydraulic control directional valve is greater than a set pressure value of the overflow valve.
As a further improvement of the above scheme, the hydraulic pump is a closed hydraulic pump.
As a further improvement of the scheme, the driving device is a motor or a gasoline engine or a diesel engine.
The working principle of the emergency brake hydraulic system is as follows:
when the parking brake is normally moved, the shuttle valve leads high-pressure oil at the oil outlet of the hydraulic pump to a control cavity of the pilot-operated type hydraulic control reversing valve to automatically control the reversing of the pilot-operated type hydraulic control reversing valve so as to release the parking brake; in the traveling process, once the first hydraulic pipe or the second hydraulic pipe between the hydraulic pump and the motor bursts, the pilot control pressure of the pilot type hydraulic control reversing valve is reduced immediately, the valve core reset spring of the pilot type hydraulic control reversing valve pushes the valve core to reset quickly, and the control pressure oil of the parking brake is unloaded to automatically realize emergency braking.
Because the utility model adopts the above technical scheme, make the beneficial effect that this application possesses lie in:
1. the utility model discloses an emergency braking hydraulic system, including drive arrangement, hydraulic pump and the oil supplementing pump of establishing ties in proper order, still include the motor of drive wheel, parking brake, be used for controlling parking braking's guide's formula liquid accuse switching-over valve and shuttle valve, the oil supplementing pump is used for supplying the coolant oil for the hydraulic pump, the hydraulic pump has two oil-outs, two oil-outs respectively through first hydraulic pressure pipe and second hydraulic pressure pipe with two oil inlets of motor are connected, the first oil inlet and the first hydraulic pressure union coupling of shuttle valve, the second oil inlet and the second hydraulic pressure union coupling of shuttle valve, the oil-out of shuttle valve with the guide oil mouth of guide's formula hydraulic pressure switching-over valve is connected; when the parking brake is normally moved, the shuttle valve automatically controls the reversing of the pilot-operated type hydraulic control reversing valve to realize the releasing of the parking brake by leading high-pressure oil at the oil outlet of the hydraulic pump to a control cavity of the pilot-operated type hydraulic control reversing valve; when the first hydraulic pipe or the second hydraulic pipe bursts, the pilot control pressure of the pilot-operated type hydraulic control reversing valve is reduced immediately, at the moment, the valve core reset spring of the pilot-operated type hydraulic control reversing valve pushes the valve core to reset quickly, the emergency brake is automatically realized by unloading the control pressure oil of the parking brake, the safety brake under the emergency condition is ensured by the arrangement of the shuttle valve, and compared with an electromagnetic control valve, the potential safety hazard caused by the fact that the emergency brake cannot be carried out due to control signal failure is avoided.
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, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic diagram of an emergency braking hydraulic system of the present invention;
reference numerals:
1. a drive device; 2. a hydraulic pump; 21. a first hydraulic pipe; 22. a second hydraulic pipe; 3. an oil replenishing pump; 4. a motor; 5. a parking brake; 6. a pilot operated hydraulically controlled directional control valve; 7. a shuttle valve; 8. a filter; 9. a first oil compensation safety valve; 10. a second oil-replenishing safety valve; 11. an overflow valve.
Detailed Description
First of all, it should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention. And can be adjusted as needed by those skilled in the art to suit particular applications.
Next, it should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "inside", "outside", and the like are based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that a device or member must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present invention.
Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "connected" and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; the two components can be directly connected or indirectly connected through an intermediate medium, and the two components can be communicated with each other. The specific meaning of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The invention is further described below with reference to the accompanying drawings and specific embodiments:
referring to fig. 1, the utility model provides an emergency braking hydraulic system, including drive arrangement 1, hydraulic pump 2 and the oil supplementing pump 3 that establish ties in proper order, still include motor 4, parking brake 5, be used for controlling parking braking's guide's formula hydraulic control switching-over valve 6 and shuttle valve 7, oil supplementing pump 3 is used for supplying coolant oil for hydraulic pump 2, hydraulic pump 2 has two oil-outs, two oil-outs respectively through first hydraulic pressure pipe 21 and second hydraulic pressure pipe 22 with two oil inlets of motor 4 are connected, the first oil inlet of shuttle valve 7 is connected with first hydraulic pressure pipe 21, the second oil inlet of shuttle valve 7 is connected with second hydraulic pressure pipe 22, the oil-out of shuttle valve 7 is connected with the guide's oil mouth of guide's formula hydraulic pressure switching-over valve; when the parking brake is normally moved, the shuttle valve 7 automatically controls the reversing of the pilot type hydraulic control reversing valve 6 by leading high-pressure oil at the oil outlet of the hydraulic pump 2 to a control cavity of the pilot type hydraulic control reversing valve 6 so as to release the parking brake; when the first hydraulic pipe 21 or the second hydraulic pipe 22 bursts, the pilot control pressure of the pilot-operated hydraulic control reversing valve 6 is immediately reduced, at the moment, the valve core reset spring of the pilot-operated hydraulic control reversing valve 6 pushes the valve core to reset quickly, the emergency braking is automatically realized by unloading the control pressure oil of the parking brake 5, the safety braking under the emergency condition is ensured by the arrangement of the shuttle valve 7, and compared with an electromagnetic control valve, the potential safety hazard caused by the fact that the emergency braking cannot be realized due to control signal failure is avoided.
As a preferred embodiment, in order to provide the system with cooled hydraulic oil and maintain the circuit pressure of the main system, the emergency braking hydraulic system is provided with an oil replenishing pump 3, further in order to ensure the cleanliness of the replenished cooled oil, the emergency braking hydraulic system is further provided with a filter 8 connected with an oil outlet of the oil replenishing pump 3, and the filter 8 is arranged to ensure the cleanliness of the whole hydraulic system and improve the reliability of the whole hydraulic system; in order to limit the pressure of the oil supplementing pump 3, an overflow valve 11 connected with the filter 8 is further arranged, and when the output pressure of the oil supplementing pump 3 is too high, the overflow valve 11 is used for unloading so as to ensure the safety of the whole system; in order to timely supplement oil at the low-pressure side and provide safety protection for the high-pressure side of the system, the emergency brake hydraulic system is further provided with a first oil supplement safety valve 9 and a second oil supplement safety valve 10, an oil inlet of the first oil supplement safety valve 9 is connected with a filter 8, and an oil outlet of the first oil supplement safety valve 9 is connected with a first hydraulic pipe 21; an oil inlet of the second oil-supplementing safety valve 10 is connected with the filter 8, and an oil outlet of the second oil-supplementing safety valve 10 is connected with the second hydraulic pipe 22.
In a preferred embodiment, the set pressure value of the spool return spring of the pilot-operated pilot-controlled directional control valve 6 is greater than the set pressure value of the relief valve 11.
As a preferred embodiment, the hydraulic pump 2 is a closed hydraulic pump 2.
As a preferred embodiment, the driving device 1 is an electric motor or a gasoline engine or a diesel engine.
The working principle of the emergency brake hydraulic system is as follows:
when the parking brake is normally moved, the shuttle valve 7 guides high-pressure oil at the oil outlet of the hydraulic pump 2 to a control cavity of the pilot type hydraulic control reversing valve 6 to automatically control the reversing of the pilot type hydraulic control reversing valve 6 so as to release the parking brake; in the traveling process, once the first hydraulic pipe 21 or the second hydraulic pipe 22 between the hydraulic pump 2 and the motor 4 bursts, the pilot control pressure of the pilot type hydraulic control directional control valve 6 is immediately reduced, the valve core reset spring of the pilot type hydraulic control directional control valve 6 pushes the valve core to be quickly reset, and the control pressure oil of the parking brake 5 is unloaded to automatically realize emergency braking.
The above is a detailed introduction of the present invention, and the principles and embodiments of the present invention have been explained herein using specific embodiments, and the explanations of the above embodiments are only used to help understand the methods and core ideas of the present invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.
Claims (6)
1. The emergency braking hydraulic system is characterized by comprising a driving device, a hydraulic pump and an oil supplementing pump which are sequentially connected in series, and further comprising a motor for driving wheels, a parking brake, a pilot type hydraulic control reversing valve for controlling parking braking and a shuttle valve, wherein the oil supplementing pump is used for supplying cooling oil to the hydraulic pump, the hydraulic pump is provided with two oil outlets which are respectively connected with two oil inlets of the motor through a first hydraulic pipe and a second hydraulic pipe, a first oil inlet of the shuttle valve is connected with the first hydraulic pipe, a second oil inlet of the shuttle valve is connected with the second hydraulic pipe, and an oil outlet of the shuttle valve is connected with a pilot oil port of the pilot type reversing valve.
2. The emergency brake hydraulic system according to claim 1, wherein during normal traveling, the shuttle valve automatically controls the reversing of the pilot-operated hydraulically-controlled reversing valve to release the parking brake by guiding the high-pressure oil at the oil outlet of the hydraulic pump to the control chamber of the pilot-operated hydraulically-controlled reversing valve; when the first hydraulic pipe or the second hydraulic pipe bursts, the pilot control pressure of the pilot type hydraulic control reversing valve is reduced, the valve core of the pilot type hydraulic control reversing valve is in a reset state, and the pressure oil of the parking brake is unloaded to automatically realize emergency braking.
3. The emergency brake hydraulic system according to claim 1 or 2, further comprising a filter connected to an oil outlet of the oil replenishment pump, an overflow valve connected to the filter, a first oil replenishment safety valve having an oil inlet connected to the filter, and a second oil replenishment safety valve having an oil outlet connected to the first hydraulic pipe; an oil inlet of the second oil supplementing safety valve is connected with the filter, and an oil outlet of the second oil supplementing safety valve is connected with the second hydraulic pipe.
4. The emergency brake hydraulic system according to claim 3, wherein a set pressure value of a spool return spring of the pilot-operated hydraulically-controlled directional control valve is larger than a set pressure value of the relief valve.
5. The emergency brake hydraulic system of claim 4, wherein the hydraulic pump is a closed hydraulic pump.
6. The emergency brake hydraulic system of claim 5, wherein the driving means is an electric motor or a gasoline engine or a diesel engine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021995244.5U CN213502251U (en) | 2020-09-14 | 2020-09-14 | Emergency brake hydraulic system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021995244.5U CN213502251U (en) | 2020-09-14 | 2020-09-14 | Emergency brake hydraulic system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213502251U true CN213502251U (en) | 2021-06-22 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021995244.5U Active CN213502251U (en) | 2020-09-14 | 2020-09-14 | Emergency brake hydraulic system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213502251U (en) |
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2020
- 2020-09-14 CN CN202021995244.5U patent/CN213502251U/en active Active
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