CN114212064B - Work machine and brake system - Google Patents
Work machine and brake system Download PDFInfo
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- CN114212064B CN114212064B CN202210032607.2A CN202210032607A CN114212064B CN 114212064 B CN114212064 B CN 114212064B CN 202210032607 A CN202210032607 A CN 202210032607A CN 114212064 B CN114212064 B CN 114212064B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
- B60T13/24—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being gaseous
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Abstract
The invention provides a working machine and a brake system. The braking system comprises a hand brake valve, a first trailer valve, a first differential valve and a parking air cylinder, the parking air cylinder is communicated with a first rear axle brake air chamber through the first differential valve, a first air source input port is connected between the parking air cylinder and the first differential valve, and a first II output port is communicated with the first rear axle brake air chamber through a control port of the first differential valve. According to the brake system provided by the invention, through the arrangement of the first differential valve, no matter a hand brake is pulled or a foot brake is stepped on, air pressure can be established at the control port of the first differential valve, and braking force is output for the first rear axle brake air chamber.
Description
Technical Field
The invention relates to the technical field of parking systems of vehicles, in particular to a working machine and a brake system.
Background
With the increasing axle load and the increasing prevalence of overload phenomena of vehicles (such as cranes and tractors), the existing parking brake performance is limited by a plurality of factors. For example, when the parking brake force reaches the limit, the parking brake force cannot be increased further, and the vehicle is likely to be parked on a slope when the load is heavy. The parking performance cannot be further improved due to the above-described limitations.
Disclosure of Invention
The invention provides a working machine and a brake system, which are used for solving the defect that a vehicle is easy to stay on a slope in the prior art and achieving the purposes of high parking performance and high safety of the vehicle.
The present invention provides a braking system comprising: the brake system comprises a hand brake valve, a first trailer valve, a first differential valve and a parking air cylinder, wherein the first trailer valve comprises a first III control port and a first II output port, and the hand brake valve is communicated with the first III control port;
the parking air cylinder passes through first differential valve with first rear axle brake air chamber intercommunication, first air supply input port is connected the parking air cylinder with between the first differential valve, first II delivery outlets pass through a control mouth of first differential valve with first rear axle brake air chamber intercommunication.
According to the braking system provided by the invention, the braking system further comprises a pressure regulating valve, and the pressure regulating valve is connected between the first II output port and the first differential valve.
The braking system further comprises an emergency air storage cylinder, an overflow valve and a one-way valve, wherein the one-way valve and the overflow valve are arranged on an air supply pipeline communicated with the emergency air storage cylinder, and the opening pressure of the overflow valve is starting air pressure.
The braking system further comprises a second trailer valve, wherein the second trailer valve comprises a second I control port, a second II control port and a second II output port, the second II control port is communicated with the hand brake valve, and the second I control port is communicated with an air outlet of the emergency air storage cylinder; and the second II output port and the second air source input port are communicated with a second rear axle brake air chamber through a first relay valve.
According to the brake system provided by the invention, the brake system further comprises a shuttle valve, and the shuttle valve is communicated between the first relay valve and the second rear axle brake air chamber.
According to the braking system provided by the invention, the braking system further comprises a composite braking air chamber, the composite braking air chamber is communicated with the shuttle valve, and the composite braking air chamber is connected with the second rear axle braking air chamber in parallel.
According to the braking system provided by the invention, the hand brake valve is communicated with the second I control port or the second II control port through the first electromagnetic air valve, when an air pressure sensor arranged on the parking air cylinder detects that the air pressure is lower than or equal to a first set air pressure value of the pressure regulating valve, the first electromagnetic air valve is communicated, the second II output port is communicated with the second air source input port, and the first relay valve inflates the second rear axle braking air chamber and the composite braking air chamber.
According to the braking system provided by the invention, the emergency air cylinder is communicated with the second I control port or the second II control port through the second electromagnetic air valve, when the air pressure sensor detects that the air pressure is lower than or equal to a second set air pressure value of the pressure regulating valve, the second electromagnetic air valve is opened, the second II output port is communicated with the second air source input port, and the air pressure of the emergency air cylinder is output in full force.
According to the braking system provided by the invention, the first set air pressure value and the second set air pressure value are both smaller than the upper limit value of the pressure regulating valve.
The present invention also provides a work machine comprising: a braking system as described above.
According to the brake system provided by the invention, the first differential valve is arranged, the parking air cylinder is communicated with the first rear axle brake air chamber through the first differential valve, the first air source input port is connected between the parking air cylinder and the first differential valve, and the first II output port is communicated with the first rear axle brake air chamber through one control port of the first differential valve. No matter the hand brake is pulled or the foot brake is stepped on, air pressure can be established at the control opening of the first differential valve, and braking force is output for the brake chamber of the first rear axle.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed to be 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 it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic control flow diagram of a braking system provided by the present invention;
FIG. 2 is a second schematic diagram of a partial structure of a control flow of the braking system provided by the present invention;
FIG. 3 is a third schematic diagram of a partial structure of a control flow of the braking system provided by the present invention;
reference numerals are as follows:
a hand brake valve 10;
the first trailer valve 31; a first I control port 41a; a first II control port 42a; a first iii control port 43a; a first I output port 12a; a first II output port 22a; a first gas source input port 11a;
the parking air cylinder 24 is provided with a parking air cylinder,
first rear axle brake chamber 29;
a pressure regulating valve 25; a first differential valve 30;
an emergency air cylinder 13; an overflow valve 7; a check valve 14;
a second trailer valve 8; a second i control port 41b; a second II control port 42b; a second iii control port 43b; a second I output port 12b; a second II output port 22b; a second gas supply input port 11b;
a first relay valve 15; a second rear axle brake chamber 27;
a shuttle valve 18; a compound brake chamber 28;
a first electromagnetic air valve 9; a barometric pressure sensor 20; a second electromagnetic gas valve 12; a double-cavity brake master cylinder 4;
a second relay valve 02; a front axle service brake chamber 01; a four-circuit protection valve 5; a rear axle air reservoir 6; a controller 11; a front axle air reservoir 16; a gas source, dryer 17; a third relay valve 19; a second differential valve 26.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present 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.
The braking system of the present invention is described below with reference to fig. 1 to 3. It should be noted that the brake system may be a pneumatic brake system, which is used on a work machine. The principle of the air braking system is that an air compressor is driven to work by the power of an engine, and then the pressure of compressed air is converted into mechanical thrust to brake wheels. The driver only needs to control the travel of the pedal and the hand brake according to different braking strength requirements to release different amounts of compressed air, and the required braking force can be obtained by adjusting the air pressure. Further, the work machine may include a crane, an excavator, a shovel transportation machine, a tractor, or the like.
As shown in fig. 1, a brake system according to an embodiment of the present invention includes: the brake system comprises a hand brake valve 10, a first trailer valve 31, a second trailer valve 8, a parking air cylinder 24, an emergency air cylinder 13, a first differential valve 30, a pressure regulating valve 25, an overflow valve 7, a one-way valve 14, a first relay valve 15, a second relay valve 02, a first solenoid valve 9, an air pressure sensor 20, a second solenoid valve 12, a double-cavity brake master cylinder 4, a four-circuit protection valve 5, a rear axle air cylinder 6, a controller 11, a front axle air cylinder 16, an air source, a dryer 17, a third relay valve 19 and a second differential valve 26.
As shown in fig. 1, the double-cavity master cylinder 4 controls the front axle air storage cylinder 16 to supply air to the front axle service brake chamber 01; the double-cavity brake master cylinder 4 controls the rear axle air storage cylinder 6 to supply air to the first rear axle brake air chamber 29. Furthermore, two front axle service brake chambers 01 are provided, and the double-cavity master cylinder 4 is communicated with the two front axle service brake chambers 01 through a second relay valve 02.
Referring to fig. 1, the four-circuit protection valve 5 is communicated with the front axle air cylinder 16, the rear axle air cylinder 6, the parking air cylinder 24 and the emergency air cylinder 13, the four-circuit protection valve 5 is further communicated with the air source and the dryer 17, and the air source and the dryer 17 are used for drying air. When the hand brake is pulled, the output air pressure of the hand brake valve 10 is reduced to 0.
As shown in fig. 1 and 2, first trailer valve 31 includes a first iii control port 43a and a first ii output port 22a. It should be noted that the structure and the operation principle of the first trailer valve 31 are the same as those of the trailer valve in the related art, for example, the first trailer valve 31 includes a first i control port 41a, a first ii control port 42a, a first iii control port 43a, a first i output port 12a, a first ii output port 22a and a first gas source input port 11a, and the operation principle of the first trailer valve 31 is not described in detail herein.
Referring to fig. 1, the hand brake valve 10 is communicated with a first control port iii 43a, the parking cylinder 24 is communicated with a first air source input port 11a, and a first ii output port 22a is communicated with a first rear axle brake chamber 29. The first i control port 41a, the first ii control port 42a, and the first i output port 12a are in a closed state.
Referring to fig. 2, the parking air cylinder 24 communicates with the first rear axle brake air chamber 29 through a first differential valve 30, and the first air source input port 11a is connected between the parking air cylinder 24 and the first differential valve 30, that is, the first air source input port 11a is connected to a pipe between the parking air cylinder 24 and the first differential valve 30. The first ii output port 22a communicates with the first rear axle brake chamber 29 through a control port of the first differential valve 30. Therefore, the parking assistance of the vehicle can be realized, and meanwhile, the normal service brake cannot be interfered. In addition, to the car that parking brake force is not enough or lack parking air chamber and arrange the space, require higher to the parking ability again simultaneously, can play the effect that promotes its parking ability.
According to the brake system of the embodiment of the present invention, by providing the first differential valve 30, and the parking air cylinder 24 communicating with the first rear axle brake air chamber 29 through the first differential valve 30, the first air supply input port 11a is connected between the parking air cylinder 24 and the first differential valve 30, and the first ii output port 22a communicates with the first rear axle brake air chamber 29 through one control port of the first differential valve 30. Whether a handbrake or a service brake is applied, air pressure can be built up at the control port of the first differential valve 30 to output a braking force for the first rear axle brake chamber 29. This is the parking assist apparatus constructed in the embodiment of the present invention.
According to some embodiments of the present invention, referring to fig. 1, the dual chamber master cylinder 4 is in communication with both the front axle air reservoir 16 and the rear axle air reservoir 6, and there are two first rear axle brake chambers 29. One port of the double-cavity brake master cylinder 4 is communicated with the two front axle service brake chambers 01 through a second relay valve 02; the other port of the master cylinder 4 communicates with both of the first rear axle brake chambers 29 via the other control port of the first differential valve 30. When the hand brake is pulled, the output air pressure of the hand brake valve 10 is reduced to 0, or after the foot brake is stepped on, the air pressure can be established at the control port of the first differential valve 30 to output the braking force for the first rear axle brake air chamber 29.
According to some embodiments of the present invention, as shown in fig. 1 and 2, the pressure regulating valve 25 is connected between the first ii output port 22a and the first differential valve 30. The purpose of the pressure regulating valve 25 is: in order to prevent the air pressure of the brake system from being attenuated during parking, the air pressure of the system is adjusted to be within a set pressure range, so that the output braking force of the first rear axle brake chamber 29 is not attenuated. In some embodiments, the upper pressure regulation limit of the pressure regulating valve 25 may be set to 0.55MPa. Therefore, the braking system can construct a first-level braking protection, and the aim that the performance of auxiliary parking cannot be influenced even if the air pressure is attenuated before the pressure is attenuated to the set pressure of the pressure regulating valve 25 is achieved.
With reference to fig. 1, in some examples, the emergency reservoir 13 may be in communication with an air supply line, on which a one-way valve 14 and an overflow valve 7 may be arranged. Thus, the opening pressure of the overflow valve 7 is the starting air pressure of the vehicle, the other loops can be ensured to be supplied with air preferentially, and the check valve 14 can be used for preventing the compressed air of the emergency air storage cylinder 13 from flowing back.
In some examples, as can be seen in connection with fig. 1, the second trailer valve 8 includes a second i control port 41b, a second ii control port 42b and a second ii output port 22b. It should be noted that the second trailer valve 8 has the same construction and operation principle as those of the trailer valve in the related art, for example, the second trailer valve 8 includes a second i control port 41b, a second ii control port 42b, a second iii control port 43b, a second i output port 12b, a second ii output port 22b, and a second source input port 11b. The working principle of the first trailer valve 31 is not described in detail here.
The second II control port 42b is communicated with the hand brake valve 10, the second I control port 41b is communicated with the air outlet of the emergency air cylinder 13, and the second II output port 22b and the second air source input port 11b are communicated with the second rear axle brake air chamber 27 through the first relay valve 15. The inlet of the first relay valve 15 is connected to the emergency reservoir 13, and the emergency reservoir 13 can supply air to the first relay valve 15. The control port of the first relay valve 15 communicates with the second ii output port 22b of the second trailer valve 8, which facilitates the establishment of air pressure at the air passage of the emergency reservoir 13 connected to the first relay valve 15.
As shown in fig. 1 and 3 in conjunction, the output port of the first relay valve 15 is connected to a line connecting the third relay valve 19 to the corresponding air chamber via the shuttle valve 18. For example, as shown in FIG. 3, compound brake chamber 28 and second rear axle brake chamber 27 are connected in parallel and both communicate with shuttle valve 18. Further, referring to fig. 3, there are two shuttle valves 18, a compound brake chamber 28 and a second rear axle brake chamber 27. Two shuttle valves 18 are communicated with the third relay valve 19, each shuttle valve 18 is correspondingly connected with a composite brake air chamber 28 and a second rear axle brake air chamber 27, and the composite brake air chamber 28 and the second rear axle brake air chamber 27 which are connected to the same shuttle valve 18 are connected in parallel. Therefore, the air path system of the brake system can be simplified by utilizing the parallel air path connection mode, and the simultaneous control is convenient to realize.
In some embodiments, the hand brake valve 10 is communicated with the second control port i 41b or the second control port ii 42b through the first electromagnetic gas valve 9. For example, as shown in fig. 1 and 2, the hand brake valve 10 communicates with the second ii control port 42b through the first solenoid valve 9. When the air pressure sensor 20 arranged on the parking air cylinder 24 detects that the air pressure is lower than or equal to a first set air pressure value of the pressure regulating valve 25, the first electromagnetic air valve 9 is switched on, the second II output port 22b and the second air source input port 11b are switched on, and the first relay valve 15 inflates the second rear axle brake air chamber 27 and the composite brake air chamber 28 to apply braking force, so that the parking braking force is ensured not to be attenuated. To this end, the brake system initiates a second level of brake protection. That is, when the pressure is continuously decreased and is lower than the set pressure value of the pressure regulating valve 25, the second stage brake protection may be activated to enhance the brake stability and safety.
In some embodiments, the emergency air cylinder 13 is communicated with the second I control port 41b or the second II control port 42b through the second solenoid valve 12. For example, as shown in fig. 1 and 2, the hand brake valve 10 communicates with the second i control port 41b through the second solenoid valve 12. When the air pressure sensor 20 detects that the air pressure is lower than or equal to a second set air pressure value of the pressure regulating valve 25, the second electromagnetic air valve 12 is opened, the second II output port 22b is communicated with the second air source input port 11b, and the emergency air cylinder 13 outputs the air pressure. Here, the emergency reservoir 13 can deliver air pressure at full force. To this end, the brake system initiates a third level of brake protection. It should be noted that when the pressure is continuously reduced and is lower than the second set air pressure value, the third level of brake protection is started to enhance the brake stability and safety.
According to some embodiments of the invention, the first set air pressure value and the second set air pressure value are both smaller than the upper limit value of the pressure regulating valve. For example, the upper limit of the pressure regulation valve 25 may be set to 0.55MPa, the first set air pressure may be set to 0.5MPa, and the second set air pressure may be set to 0.4MPa, i.e., 0.4MPa < 0.55MPa, and 0.5MPa < 0.55MPa.
A work machine according to an embodiment of the present invention includes a brake system as described above.
According to the working machine of the embodiment of the present invention, by providing the first differential valve 30, and communicating the parking air cylinder 24 with the first rear axle brake air chamber 29 through the first differential valve 30, the first air supply input port 11a is connected between the parking air cylinder 24 and the first differential valve 30, and the first ii output port 22a communicates with the first rear axle brake air chamber 29 through one control port of the first differential valve 30. No matter the hand brake is pulled or the foot brake is stepped on, the air pressure can be established at the control port of the first differential valve 30 to output the braking force to the first rear axle brake air chamber 29.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (8)
1. A braking system, comprising: the brake system comprises a hand brake valve, a first trailer valve, a first differential valve and a parking air cylinder, wherein the first trailer valve comprises a first III control port and a first II output port, and the hand brake valve is communicated with the first III control port;
the parking air cylinder is communicated with a first rear axle brake air chamber through the first differential valve, a first air source input port is connected between the parking air cylinder and the first differential valve, and a first II output port is communicated with the first rear axle brake air chamber through a control port of the first differential valve;
the brake system further comprises a second trailer valve, the second trailer valve comprises a second I control port, a second II control port and a second II output port, the second II control port is communicated with the hand brake valve, and the second I control port is communicated with an air outlet of the emergency air storage cylinder;
and the second II output port and the second air source input port are communicated with a second rear axle brake air chamber through a first relay valve.
2. The brake system according to claim 1, further comprising an overflow valve and a check valve, wherein the check valve and the overflow valve are arranged on an air supply pipeline communicated with the emergency air cylinder, and the opening pressure of the overflow valve is starting air pressure.
3. The braking system of claim 1, further comprising a shuttle valve in communication between the first relay valve and the second rear axle brake chamber.
4. A braking system according to claim 3 further comprising a compound brake chamber, said compound brake chamber being in communication with said shuttle valve and said compound brake chamber being in parallel with said second rear axle brake chamber.
5. The brake system of claim 4, wherein the hand brake valve is in communication with the second I or II control port via a first solenoid gas valve,
when an air pressure sensor arranged on the parking air cylinder detects that the air pressure is lower than or equal to a first set air pressure value of the pressure regulating valve, the first electromagnetic air valve is communicated, the second II output port is communicated with the second air source input port,
and the first relay valve inflates the second rear axle brake air chamber and the composite brake air chamber.
6. The brake system as claimed in claim 5, wherein the emergency air reservoir communicates with the second I or II control port through a second solenoid valve,
when the air pressure sensor detects that the air pressure is lower than or equal to a second set air pressure value of the pressure regulating valve, the second electromagnetic air valve is opened, the second II output port is communicated with the second air source input port, and the emergency air cylinder outputs full air pressure.
7. The brake system according to claim 6, wherein the first set air pressure value and the second set air pressure value are both smaller than an upper limit value of the pressure regulating valve.
8. A working machine, characterized in that it comprises a braking system according to any one of claims 1-7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210032607.2A CN114212064B (en) | 2022-01-12 | 2022-01-12 | Work machine and brake system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210032607.2A CN114212064B (en) | 2022-01-12 | 2022-01-12 | Work machine and brake system |
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| Publication Number | Publication Date |
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| CN114212064A CN114212064A (en) | 2022-03-22 |
| CN114212064B true CN114212064B (en) | 2022-12-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210032607.2A Active CN114212064B (en) | 2022-01-12 | 2022-01-12 | Work machine and brake system |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114684089B (en) * | 2022-05-25 | 2022-09-02 | 中汽北消(北京)应急装备科技有限公司 | Multifunctional composite braking system of large desert transport vehicle |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110997434A (en) * | 2017-08-16 | 2020-04-10 | 威伯科有限公司 | Electropneumatic parking brake module with directly controlled valve |
| CN210793149U (en) * | 2019-11-20 | 2020-06-19 | 三一汽车起重机械有限公司 | Brake system and crane |
| CN112368195A (en) * | 2018-07-20 | 2021-02-12 | 威伯科有限公司 | Electropneumatic parking brake module with directly controlled valve and anti-refiring interface |
| CN113291274A (en) * | 2021-06-30 | 2021-08-24 | 三一汽车起重机械有限公司 | Vehicle brake system and work vehicle |
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2022
- 2022-01-12 CN CN202210032607.2A patent/CN114212064B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110997434A (en) * | 2017-08-16 | 2020-04-10 | 威伯科有限公司 | Electropneumatic parking brake module with directly controlled valve |
| CN112368195A (en) * | 2018-07-20 | 2021-02-12 | 威伯科有限公司 | Electropneumatic parking brake module with directly controlled valve and anti-refiring interface |
| CN210793149U (en) * | 2019-11-20 | 2020-06-19 | 三一汽车起重机械有限公司 | Brake system and crane |
| CN113291274A (en) * | 2021-06-30 | 2021-08-24 | 三一汽车起重机械有限公司 | Vehicle brake system and work vehicle |
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