CN212098809U - Electro-hydraulic brake system and engineering vehicle - Google Patents
Electro-hydraulic brake system and engineering vehicle Download PDFInfo
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- CN212098809U CN212098809U CN202020812375.9U CN202020812375U CN212098809U CN 212098809 U CN212098809 U CN 212098809U CN 202020812375 U CN202020812375 U CN 202020812375U CN 212098809 U CN212098809 U CN 212098809U
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Abstract
The utility model discloses an electricity liquid braking system and engineering vehicle. The electro-hydraulic braking system comprises a hydraulic pump unit, a service braking unit and a parking braking unit, the hydraulic pump unit comprises a hydraulic pump, the service braking unit comprises an energy accumulator connected with the hydraulic pump, the parking braking unit is provided with a parking oil inlet, a parking control oil port, a pressure reducing valve and a first on-off control valve, the parking oil inlet is connected with the energy accumulator and the hydraulic pump, the first on-off control valve is arranged between the parking oil inlet and the oil inlet of the pressure reducing valve, the oil outlet of the pressure reducing valve is connected with the parking control oil port, and the oil drain port of the pressure reducing valve. The utility model discloses an electricity liquid braking system sets up first on-off control valve between the oil inlet of relief pressure valve and parking oil inlet so as to prevent that the hydraulic oil of storing in the energy storage ware constantly from the spring chamber draining backward flow of relief pressure valve to the oil tank thereby improve system stability.
Description
Technical Field
The utility model relates to an engineering machine tool field, in particular to electricity liquid braking system and engineering vehicle.
Background
The existing braking systems of the field transportation vehicle comprise two types, namely an air braking system and a hydraulic braking system. The air brake system adopts the gas generated by the air compressor as power, and is connected with a drum brake on the axle through a control valve and an air pipe, the braking reaction of the air brake system is lagged, the braking torque has certain limitation, and the air compressor occupies too much space of the vehicle body. The hydraulic braking system adopts hydraulic oil as power, and hydraulic oil gets into axle stopper through various valves and longer pipeline, still has shortcomings such as braking reaction time is long, and in addition, hydraulic braking system generally adopts great hydraulic power unit, can occupy great space of whole car like this.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an electricity liquid braking system and engineering vehicle to improve system stability.
The utility model discloses the first aspect provides an electricity liquid braking system, include:
a hydraulic pump unit including a hydraulic pump;
the service braking unit comprises an energy accumulator connected with the hydraulic pump; and
the parking brake unit is provided with a parking oil inlet, a parking control oil port, a pressure reducing valve and a first on-off control valve, the parking oil inlet is connected with the energy accumulator and the hydraulic pump, the first on-off control valve is arranged between the parking oil inlet and the oil inlet of the pressure reducing valve, the oil outlet of the pressure reducing valve is connected with the parking control oil port, and the oil discharge port of the pressure reducing valve is connected with an oil tank.
In some embodiments, the first on-off control valve is a solenoid directional valve.
In some embodiments, the parking brake unit further includes a first parking pressure switch, a pressure sensing portion of the first parking pressure switch is connected to the parking control oil port, a switch portion of the first parking pressure switch is electrically connected in series to an electromagnetic control end of the electromagnetic directional valve, and the first parking pressure switch controls on/off of the first on-off control valve according to oil pressure of the parking control oil port.
In some embodiments, the parking brake unit further includes a second parking pressure switch, a pressure sensing portion of the second parking pressure switch is connected to the parking control port, and a switching portion of the second parking pressure switch is electrically connected to the electronic control system.
In some embodiments, the parking brake unit further includes a check valve, the oil outlet of the pressure reducing valve is connected with the parking control oil port through the check valve,
in some embodiments, the service brake unit has a service oil inlet connected to the hydraulic pump, and the accumulator is connected to the service oil inlet.
In some embodiments, the service brake unit further has a service brake control oil port and further includes an electro-hydraulic proportional pressure reducing valve disposed between the service oil inlet and the service brake control oil port, and a valve port opening of the electro-hydraulic proportional pressure reducing valve is adjustably set.
In some embodiments, the service brake unit further comprises a second on-off control valve disposed between the electro-hydraulic proportional pressure reducing valve and the service oil inlet.
The utility model discloses the second aspect provides an engineering vehicle, including parking brake with if the utility model discloses the electric hydraulic braking system that the arbitrary item of the first aspect provided, parking brake is connected with parking control hydraulic fluid port.
In some embodiments, the engineering vehicle comprises a plurality of parking brakes, wherein the parking brake unit comprises a plurality of parking control oil ports correspondingly connected with the plurality of parking brakes; or the parking brake unit further comprises a flow divider, an oil inlet of the flow divider is connected with the parking control oil port, and a plurality of oil outlets of the flow divider are correspondingly connected with the parking brakes respectively.
Based on the utility model provides an electricity liquid braking system and engineering vehicle, electricity liquid braking system includes the hydraulic pump unit, service braking unit and parking braking unit, the hydraulic pump unit includes the hydraulic pump, service braking unit includes the energy storage ware with hydraulic pump connection, parking braking unit has the parking oil inlet, parking control hydraulic fluid port, relief pressure valve and first on-off control valve, the parking oil inlet is all connected with energy storage ware and hydraulic pump, first on-off control valve sets up between the oil inlet of parking oil inlet and relief pressure valve, the oil-out and the parking control hydraulic fluid port of relief pressure valve are connected, the oil drain port and the oil tank of relief pressure valve are connected. The utility model discloses an electricity liquid braking system sets up first on-off control valve between the oil inlet of relief pressure valve and parking oil inlet so as to prevent that the hydraulic oil of storing in the energy storage ware constantly from the spring chamber draining backward flow of relief pressure valve to the oil tank thereby improve system stability.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments of the invention, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without undue limitation to the invention. In the drawings:
fig. 1 is a schematic structural diagram of an electro-hydraulic brake system according to an embodiment of the present invention;
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Unless specifically stated otherwise, the relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present invention. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. 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, further discussion thereof is not required in subsequent figures.
Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously positioned and the spatially relative descriptors used herein interpreted accordingly.
As shown in fig. 1, the electro-hydraulic brake system of the embodiment of the present invention includes:
a hydraulic pump unit 1 including a hydraulic pump 11;
a service brake unit 2 comprising an accumulator 21 connected to the hydraulic pump 11; and
the parking brake unit 3 is provided with a parking oil inlet A, a parking control oil port R, a pressure reducing valve 33 and a first on-off control valve 36, the parking oil inlet A is connected with the energy accumulator 21 and the hydraulic pump 11, the first on-off control valve 36 is arranged between the parking oil inlet A and the oil inlet of the pressure reducing valve 33, the oil outlet of the pressure reducing valve 33 is connected with the parking control oil port R, and the oil discharge port of the pressure reducing valve 33 is connected with an oil tank.
The electro-hydraulic brake system is provided with a first on-off control valve 36 between an oil inlet of a pressure reducing valve 33 and a parking oil inlet A to prevent hydraulic oil stored in an energy accumulator 21 from continuously draining oil from a spring cavity of the pressure reducing valve 33 and flowing back to an oil tank, so that the stability of the system is improved. The hydraulic oil in the accumulator 21 is filled by the hydraulic pump 11, and the leakage of the hydraulic oil from the accumulator 21 may cause frequent start and stop of the motor for driving the hydraulic pump 11.
The first on-off control valve 36 of the present embodiment is a solenoid directional valve. And the electromagnetic reversing valve reverses according to the oil pressure of the parking control oil port R.
Specifically, as shown in fig. 1, the parking brake unit 3 of the present embodiment further includes a first parking pressure switch 35, a pressure sensing portion of the first parking pressure switch 35 is connected to the parking control port R, and a switch portion of the first parking pressure switch 35 is electrically connected in series to an electromagnetic control end of the electromagnetic directional valve.
The parking brake unit 3 of this embodiment further includes a second parking pressure switch 31, a pressure sensing portion of the second parking pressure switch 31 is connected to the parking control port R, and a switching portion of the second parking pressure switch 31 is connected to the electronic control system.
The service brake unit 2 of the present embodiment has a service oil inlet C connected to the hydraulic pump 11, and the accumulator 21 is connected to the service oil inlet C.
The service brake unit 2 of this embodiment further has a service brake control oil port B and further includes an electro-hydraulic proportional pressure reducing valve 24 disposed between the service oil inlet C and the service brake control oil port B, and the opening degree of a valve port of the electro-hydraulic proportional pressure reducing valve 24 is adjustably set.
The service brake unit of the embodiment further comprises a second on-off control valve 25 arranged between the electro-hydraulic proportional pressure reducing valve 24 and the service oil inlet C.
The structure and operation of the electro-hydraulic brake system according to the embodiment of the present invention will be described in detail with reference to fig. 1.
As shown in fig. 1, the electro-hydraulic brake system of the present embodiment is a modular system and includes a hydraulic pump unit 1, a service brake unit 2, and a parking brake unit 3. The hydraulic pump unit 1 and the service brake unit 2 are assembled in a superposition mode, and the service brake unit 2 and the parking brake unit 3 are assembled in a superposition mode.
The hydraulic pump unit 1 of the present embodiment includes a dc motor, a hydraulic pump 11, an overflow valve 12, a check valve, a filter, an oil tank, and other accessories. Specifically, the hydraulic pump 11 of the present embodiment is a gear pump. Because the stopper is high pressure low discharge, the less generally no more than 6L of oil tank volume, the oil inlet and the oil-out of oil tank of gear pump are connected, and the oil-out of gear pump links to each other with the oil inlet of energy storage ware 21, and the check valve is used for preventing the inside hydraulic oil of energy storage ware 21 among service brake unit 2 from flowing back to the oil tank.
The service brake unit 2 of the present embodiment includes an accumulator 21, a service pressure switch 22, a pressure sensor 23, an electro-hydraulic proportional pressure reducing valve 24, and a second on-off control valve 25. The service braking oil port B of the service braking unit 2 is connected with a service brake of a brake bridge, and the electro-hydraulic proportional pressure reducing valve 24 controls the opening size of the valve core through a current signal given by an electric control system so as to control the service braking torque. The pressure sensor 23 is configured to detect a pressure of the accumulator 21 and send a pressure value of the accumulator 21 to the electronic control system, and the electronic control system controls whether the hydraulic pump 11 supplies oil to the accumulator 21 according to the pressure value. When the pressure value of the accumulator 21 is lower than the first set value, the direct current motor in driving connection with the hydraulic pump 11 is automatically started, and the hydraulic pump 11 fills liquid into the accumulator 21; when the pressure value of the accumulator 21 reaches the second design value, the direct current motor is automatically turned off. The driving pressure switch 22 is connected to the electric control system by signals, when the driving pressure switch 22 detects that the pressure of the energy accumulator 21 is lower than the low limit value, the system is in fault, the electric control system can send out an alarm signal, and the whole machine is stopped. The energy accumulator 21 is connected to the axle service brake via a second on-off control valve 25 and an electro-hydraulic proportional pressure reducing valve 24.
The parking brake unit 3 includes a first parking pressure switch 35, a first on-off control valve 36, a pressure reducing valve 33, a check valve 34, a second parking pressure switch 31, and a third on-off control valve 32. The second parking pressure switch 31 is used for detecting the pressure of the parking brake, when the pressure is lower than a set value, the vehicle axle is in a braking state, the electric control system sends out an alarm signal and a braking signal, the service braking unit is started to brake, and the whole vehicle is stopped. And a parking control oil port R of the parking brake unit is used for connecting a parking brake of a brake bridge. Because the brake bridge is normally closed, the parking brake needs to be opened before the vehicle runs, so the third cut-off control valve 32 is normally electrified. The energy accumulator 21 can be directly connected with an axle parking brake through a pressure reducing valve 33, but in order to prevent hydraulic oil stored in the energy accumulator 21 from continuously draining oil from a spring cavity of the pressure reducing valve 33 and flowing back to an oil tank, so that a motor is frequently started and stopped and the stability of the system is influenced, a first on-off control valve 36 is arranged in front of the pressure reducing valve 33, a check valve 34 and a first parking pressure switch 35 are arranged behind the pressure reducing valve 33, and the first on-off control valve 36 is connected with the first parking pressure switch 35 in series and then connected to a third on-off control valve 32 in parallel. When the parking brake pressure reaches the set pressure of the first parking pressure switch 35, the first on-off control valve 36 is closed, the parking brake unit is maintained in pressure by the check valve 34, the third on-off control valve 32 is powered normally, and the brake is normally opened.
The working process of the electro-hydraulic brake system of the embodiment is as follows:
after the vehicle electric control system is powered on, the direct current motor, the first on-off control valve 36 and the third on-off control valve 32 are powered on, and the gear pump simultaneously supplies oil to the energy accumulator 21 of the service braking unit 2 and the parking braking unit 3. And the hydraulic oil is decompressed by the decompression valve 33 and then enters the axle parking brake through the parking control oil port R. When the pressure monitored by the second parking pressure switch 31 exceeds the low limit value, the parking pressure low alarm signal in the electric control system disappears, and when the pressure monitored by the second parking pressure switch 31 reaches the set high limit value of the first parking pressure switch 35 and does not exceed the maximum opening pressure of the parking brake, the first parking pressure switch 35 is switched off, the first on-off control valve 36 is switched off, and the parking brake is switched on at the moment. When the pressure of the service brake unit exceeds the low limit value of the pressure switch 22, the low system pressure alarm signal in the electric control system disappears, and when the pressure of the service brake unit reaches the pressure of the pressure switch 22, the high limit value of which is not higher than the pressure of the overflow valve, the direct current motor is powered off, and the whole vehicle has the walking condition. If the parking brake unit or the parking brake has the problems of internal unloading and the like, the system pressure of the parking brake unit is gradually reduced, when the oil pressure is lower than the lower limit value of the second pressure switch 35, the second parking pressure switch 35 is opened, the first on-off control valve 36 is powered again, and the energy accumulator 21 supplies oil to the parking brake unit 3 until the second parking pressure switch 35 is disconnected. In the running process of the whole vehicle, if braking is needed, the electric control system sends a braking current signal, the second on-off control valve 25 is electrified, meanwhile, the valve core of the electro-hydraulic proportional pressure reducing valve 24 is opened to a corresponding size according to the current value, and hydraulic oil in the energy accumulator 21 enters the vehicle axle service brake through the second on-off control valve 25 and the electro-hydraulic proportional pressure reducing valve 24, so that braking is achieved. The hydraulic oil quantity and the oil pressure in the energy accumulator can meet the requirement of continuous 6 times of braking of the whole vehicle.
The embodiment also provides an engineering vehicle, which comprises a parking brake and the electro-hydraulic brake system provided by the embodiment, wherein the parking brake is connected with the parking control oil port R.
The electro-hydraulic brake system can increase the number of the service brake oil ports B and the parking control oil ports R, or the oil outlets are provided with the tee joints to be connected with a plurality of brakes, so that a plurality of brake bridges are controlled. The electro-hydraulic brake system is small in size, can be arranged near a brake axle, is short in pipeline, and is few in pipeline and simple and attractive in overall layout because the brake hydraulic circuit is a single circuit.
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 it; although the present invention has been described in detail with reference to preferred embodiments, it should be understood by those skilled in the art that: the invention can be modified or equivalent substituted for some technical features; without departing from the spirit of the present invention, it should be understood that the scope of the claims is intended to cover all such modifications and variations.
Claims (10)
1. An electro-hydraulic brake system, comprising:
a hydraulic pump unit (1) comprising a hydraulic pump (11);
a service brake unit (2) comprising an accumulator (21) connected to the hydraulic pump (11); and
parking braking unit (3), have parking oil inlet (A), parking control hydraulic fluid port (R), relief pressure valve (33) and on-off control valve (36), parking oil inlet (A) with energy storage ware (21) with hydraulic pump (11) are all connected, on-off control valve (36) set up in parking oil inlet (A) with between the oil inlet of relief pressure valve (33), the oil-out of relief pressure valve (33) with parking control hydraulic fluid port (R) is connected, the oil drain port and the oil tank of relief pressure valve (33) are connected.
2. Electro-hydraulic brake system according to claim 1, characterized in that the first on-off control valve (36) is a solenoid directional valve.
3. The electro-hydraulic brake system according to claim 2, wherein the parking brake unit (3) further comprises a first parking pressure switch (35), a pressure sensing part of the first parking pressure switch (35) is connected with the parking control oil port (R), a switch part of the first parking pressure switch (35) is electrically connected with an electromagnetic control end of the electromagnetic directional valve in series, and the first parking pressure switch (35) controls the on-off of the first on-off control valve (36) according to the oil pressure of the parking control oil port (R).
4. The electro-hydraulic brake system according to claim 3, wherein the parking brake unit (3) further comprises a second parking pressure switch (31), a pressure sensing part of the second parking pressure switch (31) is connected with the parking control oil port (R), and a switch part of the second parking pressure switch (31) is electrically connected with an electronic control system.
5. The electro-hydraulic brake system according to claim 1, characterized in that the parking brake unit (3) further comprises a check valve (34), and an oil outlet of the pressure reducing valve (33) is connected with the parking control oil port (R) through the check valve (34).
6. The electro-hydraulic brake system according to any one of claims 1 to 5, characterized in that the service brake unit (2) has a service oil inlet (C) connected to the hydraulic pump (11), the accumulator (21) being connected to the service oil inlet (C).
7. The electro-hydraulic brake system according to claim 6, wherein the service brake unit (2) further comprises a service brake control oil port (B) and further comprises an electro-hydraulic proportional pressure reducing valve (24) arranged between the service oil inlet (C) and the service brake control oil port (B), and the opening degree of a valve port of the electro-hydraulic proportional pressure reducing valve (24) is adjustably set.
8. The electro-hydraulic brake system of claim 7, wherein the service brake unit further comprises a second on-off control valve (25) disposed between the electro-hydraulic proportional pressure reducing valve (24) and the service oil inlet (C).
9. A work vehicle, characterized in that it comprises a parking brake and an electro-hydraulic brake system according to any one of claims 1 to 8, said parking brake being connected to said parking control port (R).
10. The work vehicle according to claim 9, characterized in that the work vehicle comprises a plurality of parking brakes, wherein the parking brake unit comprises a plurality of parking control ports (R) correspondingly connected to the plurality of parking brakes; or, the parking brake unit further comprises a flow divider, an oil inlet of the flow divider is connected with the parking control oil port (R), and a plurality of oil outlets of the flow divider are respectively and correspondingly connected with the parking brakes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020812375.9U CN212098809U (en) | 2020-05-15 | 2020-05-15 | Electro-hydraulic brake system and engineering vehicle |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020812375.9U CN212098809U (en) | 2020-05-15 | 2020-05-15 | Electro-hydraulic brake system and engineering vehicle |
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| CN212098809U true CN212098809U (en) | 2020-12-08 |
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| CN202020812375.9U Active CN212098809U (en) | 2020-05-15 | 2020-05-15 | Electro-hydraulic brake system and engineering vehicle |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115123166A (en) * | 2022-06-06 | 2022-09-30 | 徐州徐工特种工程机械有限公司 | Hydraulic braking system and control method |
-
2020
- 2020-05-15 CN CN202020812375.9U patent/CN212098809U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115123166A (en) * | 2022-06-06 | 2022-09-30 | 徐州徐工特种工程机械有限公司 | Hydraulic braking system and control method |
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20210425 Address after: 221000 No.68, Gaoxin Road, Xuzhou Economic and Technological Development Zone, Xuzhou City, Jiangsu Province Patentee after: Xuzhou Xugong Port Machinery Co.,Ltd. Address before: 221004 Industrial Zone, Xuzhou Economic Development Zone, Jiangsu, Xuzhou Patentee before: XCMG RAILWAY EQUIPMENT Co.,Ltd. |
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| TR01 | Transfer of patent right |