CN109878482A - A kind of braking system and engineering truck - Google Patents
A kind of braking system and engineering truck Download PDFInfo
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- CN109878482A CN109878482A CN201910275938.7A CN201910275938A CN109878482A CN 109878482 A CN109878482 A CN 109878482A CN 201910275938 A CN201910275938 A CN 201910275938A CN 109878482 A CN109878482 A CN 109878482A
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- 239000007788 liquid Substances 0.000 claims abstract description 132
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- 238000000034 method Methods 0.000 abstract description 5
- 230000008569 process Effects 0.000 abstract description 4
- 238000010992 reflux Methods 0.000 abstract description 3
- 239000003921 oil Substances 0.000 description 152
- 239000002828 fuel tank Substances 0.000 description 39
- 239000012535 impurity Substances 0.000 description 12
- 230000009471 action Effects 0.000 description 9
- 238000011144 upstream manufacturing Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 230000017525 heat dissipation Effects 0.000 description 6
- 238000001816 cooling Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 5
- 238000005265 energy consumption Methods 0.000 description 3
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- 238000007789 sealing Methods 0.000 description 3
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- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000020169 heat generation Effects 0.000 description 2
- 230000001050 lubricating effect Effects 0.000 description 2
- 230000008439 repair process Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000013590 bulk material Substances 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005183 dynamical system Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
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- 239000013589 supplement Substances 0.000 description 1
- 239000010729 system oil Substances 0.000 description 1
- 230000026676 system process Effects 0.000 description 1
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Abstract
The invention discloses a kind of braking system and engineering trucks, are related to technical field of engineering machinery.The braking system includes hydraulic power system, dry brake and radiator, hydraulic power system is connect by fluid path control module with dry brake, fluid path control module is configured as: when service brake, hydraulic power system can drive oil liquid to enter dry brake by fluid path control module；When releasing service brake, at least partly oil liquid in dry brake is back in hydraulic power system after fluid path control module and radiator.In the braking system, using full hydraulic drive collocation dry brake, the failure rate and cost of braking system can be reduced, maintenance cost is lower.By releasing in braking process, the reflux of dry brake inner part oil liquid can make to be mixed by low temperature oil liquid with the high-temperature oil liquid in dry brake in each braking process, reduce its inner fluid temperature.The oil liquid of reflux can be quickly cooled down by radiator.
Description
Technical field
The present invention relates to technical field of engineering machinery more particularly to a kind of braking system and engineering trucks.
Background technique
Loading machine is the important mechanical equipment in engineering machinery construction, is mainly used for the shovel to bulk material, dress, fortune, digging
Equal operations.The working condition of loading machine is mainly spading operation and loading operation, and equipment needs to carry out receipts bucket, lifts, unloads
Material, decline, therefore, complete machine needs frequent progress to brake.
Currently, the braking system of loading machine can be gas cap oil caliper disc braking system.Gas cap oil caliper disc braking system
When braking is required, the high pressure gas in air accumulator is sent into booster pump through air brake valve, and high pressure gas is converted height by booster pump
Pressure oil liquid send to the caliper of bridge, brakes bridge.Cost is relatively low for gas cap oil caliper disc braking system, and maintenance is relatively easy, but
Due in air impurity and moisture content it is very high, after high-pressure unit compresses, impurity, moisture and gas are separated, although
It is filtered by separator, but filter effect is limited, impurity and moisture are very big to the damage of Hydraulic Elements, are easy to cause Hydraulic Elements
The problems such as getting rusty, abnormal sound, vibration are generated when work, corrosion also result in impurity inside Hydraulic Elements and further increase, substantially liquid
Element fault is pressed, and then leads to brake system non-functional, safety problem occurs.
To solve the above problems, the braking system of loading machine can also use all-hydraulic wet brake system.It is all-hydraulic wet
When braking is required, pressure is passed to the inside system of bridge by foot brake valves to formula braking system by the hydraulic pressure in accumulator
Dynamic pincers, brake bridge.All using hydraulic-driven in all-hydraulic wet type rotation system, cleannes are relatively high, system reliability
It relatively preferably, will not be because of the reliability of moisture damage braking system.But its cost is high with respect to gas cap oil caliper disc braking system
40000-50000 member out when maintenance, needs to dismantle the shell of bridge, therefore repair phase because the friction plate in caliper is inside bridge
To difficulty.
But above two braking system there are problems that braking oil liquid fever.
In gas cap oil caliper disc braking system, the brake component of bridge generally uses dry type braking to clamp, long-time or high frequency
When rate is braked, caliper meeting frictional heat generation, and high temperature is transferred in the oil liquid of braking system, increase oil liquid temperature.Although
The lubricating cup that oil liquid in system can return to booster pump radiates, but the lubricating cup due to caliper apart from booster pump compared with
Far, circulation cooling effect can not be generated.Further, since the cavity of caliper seals, high-temperature oil liquid will form bubble into oil liquid
It is high-order alter again, to make the fuel tank end of booster pump toward oil spout is gone out, so that booster pump Oil injection, leads to environmental pollution, and tie up
Repair enormous costs.
In all-hydraulic wet type rotation system, caliper is immersed in oil liquid, and the partial heat generated in braking can be by bridge
Oil liquid flowing, to radiate.But since long-time is braked in the closed area in high-intensitive working condition, bridge
Oil liquid can not circulate, and can not also radiate completely, and oil liquid is apt to deteriorate under high temperature environment for a long time, cause to go out inside oil liquid
Existing impurity, moisture separation, then influence the reliability of braking system.As the temperature rises, the sealing element aging in caliper
Accelerate, will lead to caliper oil leak, so that oil liquid seals in the transmission oil liquid in bridge, reduce reliability and the service life of bridge, makes
Dynamic pincers inner fluid reduction also results in braking system faults, and maintenance cost is very big.
Therefore, a kind of braking system and engineering truck are needed to solve caliper heat dissipation problem.
Summary of the invention
An object of the present invention is to provide a kind of braking systems, can solve braking oil liquid heating problem, and cost
It is lower.
To achieve this purpose, the present invention adopts the following technical scheme:
A kind of braking system, including hydraulic power system, dry brake and radiator, the hydraulic power system are logical
It crosses fluid path control module to connect with the dry brake, the fluid path control module is configured as:
When service brake, the hydraulic power system can drive oil liquid to enter the dry type by the fluid path control module
Brake；When releasing service brake, at least partly oil liquid in the dry brake passes through the fluid path control module and institute
It is back in the hydraulic power system after stating radiator.
Wherein, the fluid path control module includes hydraulic brake valve and control valve group, and the control valve group is configured as controlling
The oil outlet of the hydraulic power system and being connected to for the entrance of the dry brake are made, and controls the dry brake
Outlet is connected to the oil return opening of the hydraulic power system.
Wherein, the control valve group includes the first control valve and the second control valve, wherein first control valve one end connects
The outlet of the dry brake is connect, the other end connects the oil return opening of the hydraulic power system；
Described hydraulic brake valve one end connects the oil outlet of the hydraulic power system, other end connection second control
The entrance of valve；The outlet of second control valve connects the entrance of the dry brake.
Wherein, first control valve is hydraulic switching valve, and second control valve is overflow valve or hydraulically-controlled one-way valve.
Wherein, first control valve and second control valve are electromagnetic switch valve.
Wherein, the hydraulic brake valve is triple valve, and a valve port of the triple valve is connected to second control valve,
The other two valve port of the triple valve is separately connected the oil outlet and oil return opening of the hydraulic power system.
Wherein, the radiator is between the fluid path control module and the oil return opening of the hydraulic power system.
Wherein, the dry brake includes four calipers, is controlled after four calipers are in parallel with the fluid path
Module connection.
Wherein, there are two the dry brake settings, two driving systems are provided in the hydraulic power system parallel
Dynamic driving circuit, every service brake driving circuit pass through the fluid path control module respectively and are connected with described in one
Dry brake.
Wherein, the hydraulic power system include fuel tank, with the fuel tank outlet connection hydraulic pump and with it is described
First accumulator of hydraulic pump connection, first accumulator connect the fluid path control module.
Wherein, the oil liquid in the braking system is high temperature resistant oil liquid.
Wherein, the braking system further includes parking brake and braking valve for vehicle, and the hydraulic power system passes through institute
It states braking valve for vehicle to connect with the parking brake, the braking valve for vehicle is configured as:
When parking braking, at least partly oil liquid in the parking brake passes through the braking valve for vehicle and the heat dissipation
It is back to after device in the hydraulic power system；When releasing parking braking, oil liquid is stayed as described in hydraulic power system process
Vehicle brake valve enters in the parking brake.
It is another object of the present invention to propose a kind of engineering truck, it can solve and brake oil liquid heating problem, and at
This is lower.
To achieve this purpose, the present invention adopts the following technical scheme:
A kind of engineering truck, including above-mentioned braking system.
Wherein, the engineering truck further includes operating system, the hydraulic circuit of the braking system and the operating system
Hydraulic circuit be arranged independently of each other.
Wherein, the engineering truck is loading machine.
The utility model has the advantages that the present invention provides a kind of braking system and engineering trucks.
In the braking system, using full hydraulic drive collocation dry brake, on the one hand guarantee the cleannes of braking oil liquid,
Reduce the failure rate of braking system；On the other hand, the cost of braking system, dry brake can be reduced using dry brake
Maintenance cost it is lower.Dry brake is connect with hydraulic power system by fluid path control module, when so that releasing braking, is done
At least partly oil liquid in formula brake can be returned in hydraulic power system by fluid path control module, service brake next time
When, mixing low temp oil liquid avoids the oil in dry brake to reduce dry brake inner fluid temperature in dry brake
Liquid maintains the condition of high temperature for a long time.The oil liquid of dry brake reflux can return to hydraulic power after radiator is cooling
In system, achieve the purpose that rapid cooling oil temperature.
The hydraulic circuit of braking system and the hydraulic circuit of operating system are arranged independently of each other in the engineering truck, that is, brake
The oil liquid of system and the oil liquid of operating system do not share, and fuel tank has been separately configured in braking system, avoid because of the oil in operating system
Liquid temperature is high and leads to braking system heating problem.Braking system is independent, and high-temperature resistant medium can be only used in braking system,
Advantageously reduce cost.
Detailed description of the invention
Fig. 1 is the structural schematic diagram for the braking system that the embodiment of the present invention one provides；
Fig. 2 be the embodiment of the present invention one provide braking system in service brake oil liquid flow direction schematic diagram；
Fig. 3 be the embodiment of the present invention one provide braking system when releasing service brake oil liquid flow direction schematic diagram；
Fig. 4 be the embodiment of the present invention one provide braking system in parking braking oil liquid flow direction schematic diagram；
Fig. 5 be the embodiment of the present invention one provide braking system when releasing parking braking oil liquid flow direction schematic diagram.
Wherein:
100, hydraulic power system；
11, fuel tank；12, hydraulic pump；13, filter；14, prefill valve；15, the first accumulator；17, the second accumulator；
200, arrestment mechanism；
21, control valve group；211, hydraulic switching valve；212, overflow valve；22, dry brake；221, caliper；23, it stays
Vehicle brake；24, braking valve for vehicle；25, radiator；26, hydraulic brake valve.
Specific embodiment
The embodiment of the present invention is described below in detail, the example of embodiment is shown in the accompanying drawings, wherein identical from beginning to end
Or similar label indicates same or similar element or element with the same or similar functions.It is retouched below with reference to attached drawing
The embodiment stated is exemplary, it is intended to is used to explain the present invention, and is not considered as limiting the invention.
In the description of the present invention, it should be noted that term " center ", "upper", "lower", "left", "right", "vertical",
The orientation or positional relationship of the instructions such as "horizontal", "inner", "outside" be based on the orientation or positional relationship shown in the drawings, merely to
Convenient for description the present invention and simplify description, rather than the device or element of indication or suggestion meaning must have a particular orientation,
It is constructed and operated in a specific orientation, therefore is not considered as limiting the invention.In addition, term " first ", " second ", only
For descriptive purposes, it is not understood to indicate or imply relative importance.Wherein, term " first position " and " second position "
For two different positions.
Unless otherwise clearly defined and limited, term " installation ", " connected ", " connection ", " fixation " shall be understood in a broad sense,
For example, it may be being fixedly connected, may be a detachable connection；It can be mechanical connection, be also possible to be electrically connected；It can be straight
It connects connected, the connection inside two elements or the phase interaction of two elements can also be can be indirectly connected through an intermediary
With relationship.For the ordinary skill in the art, it can understand above-mentioned term in the present invention as the case may be
Concrete meaning.
Unless otherwise clearly defined and limited, fisrt feature second feature "upper" or "lower" may include first
Feature and second feature directly contact, also may include fisrt feature and second feature be not direct contact but by them it
Between other characterisation contact.Moreover, fisrt feature includes that fisrt feature exists above the second feature " above ", " above " and " above "
Right above second feature and oblique upper, or first feature horizontal height is merely representative of higher than second feature.Fisrt feature is second
Feature " under ", " lower section " and " following " include that fisrt feature is directly below and diagonally below the second feature, or is merely representative of first
Characteristic level height is less than second feature.
To further illustrate the technical scheme of the present invention below with reference to the accompanying drawings and specific embodiments.
Embodiment one
A kind of engineering truck is present embodiments provided, which can be haulage vehicle, crane, excavator, soil-shifting
Machine, loading machine etc..In the present embodiment, engineering truck is loading machine, is mainly used for digging operation and loading operation.Loading machine includes
Braking system and operating system, braking system are mainly used for the service brake and parking braking of loading machine.Operating system be used for into
Row receives the operation such as bucket, lifting, discharging, decline.
Loading machine needs frequent progress to brake during the work time, and in existing loading machine, braking system generally uses pneumatic jack
Oily caliper disc braking system and all-hydraulic wet brake system.Gas cap oil caliper disc braking system passes through booster pump for high pressure gas
It is converted into high-voltage oil liquid, send to the caliper of bridge, brakes bridge.Impurity and moisture pair due to being driven using air pressure, in air
The problems such as damage of Hydraulic Elements is very big, and when work is easy to produce abnormal sound and vibration, is easy to cause after Hydraulic Elements corrosion
There is safety problem in brake system non-functional.In all-hydraulic wet brake system, all using hydraulic-driven, cleannes are relatively
Height, although being able to solve in gas cap oil caliper disc braking system because impurity leads to the problem of system reliability difference, higher cost,
And maintenance relative difficulty.
To solve the above problems, as shown in Figure 1, the braking system in the present embodiment is cooperated using hydraulic power system 100
On the one hand arrestment mechanism 200 with dry brake 22 guarantees the cleannes of braking oil liquid, reduces the failure of braking system
Rate；On the other hand, the cost of braking system can be reduced using dry brake 22, the maintenance cost of brake is lower.
In the prior art, there is braking oil liquid fever in gas cap oil caliper disc braking system and all-hydraulic wet brake system
Problem is easy to cause braking system faults, and maintenance cost is big.
To solve to brake oil liquid heating problem, braking system further includes fluid path control module, fluid path control in the present embodiment
Module connects hydraulic power system 100 and dry brake 22, and makes braking system when carrying out service brake, hydraulic power system
100 driving oil liquid of system enters in dry brake 22 by fluid path control module, and the caliper 221 in dry brake 22 is to bridge
It is braked, to realize service brake.When releasing service brake, at least partly oil liquid in dry brake 22 passes through liquid
Road control module is back in hydraulic power system 100.
In service braking operation, high-pressure brake oil liquid is sent into dry brake 22 by hydraulic power system 100, to drive
Dynamic dry brake 22 is braked.In braking process, meeting frictional heat generation in dry brake 22, heat transfer is extremely braked in oil liquid,
So that the temperature of the high-pressure brake oil liquid in dry brake 22 increases.It releases in service braking operation, in dry brake 22
The braking oil liquid of at least partly high temperature be back in hydraulic power system 100 so that the high-temperature brake in dry brake 22
Oil liquid is reduced, and advantageously reduces the temperature in dry brake 22, and in service brake next time, hydraulic power system 100
Driving Immobilization oil liquid enters in dry brake 22, mixes with the high-temperature oil liquid in dry brake 22, to reach drop
The purpose of low 22 inner fluid temperature of dry brake avoids the oil liquid in dry brake 22 from being in the condition of high temperature for a long time, from
And prevent braking oil liquid from generating impurity or moisture separation because of pyrometamorphism, it can also be to avoid the sealing element in dry brake 22
Because of high temperature failure, and then improve the reliability of braking system.
Optionally, the top of dry brake 22 is provided with outlet, and when releasing braking, the part in dry brake 22 is high
Warm oil liquid, into hydraulic power system 100, avoids the impurity of 22 bottom of dry brake from entering by the outlet return of the upper end
Into hydraulic power system 100, prevent from further polluting oil liquid.
Specifically, as shown in Figure 1, hydraulic power system 100 includes fuel tank 11 and hydraulic pump 12, system is stored in fuel tank 11
Dynamic oil liquid, hydraulic pump 12 are connect with the oil outlet of fuel tank 11, and hydraulic pump 12 provides power for the braking oil liquid in fuel tank 11, so as to
In service brake, driving braking oil liquid is entered in dry brake 22 by fluid path control module.
In order to reduce the energy consumption of braking system, improve efficiency, hydraulic power system 100 further includes that prefill valve 14 and first store
Energy device 15, prefill valve 14 connect hydraulic pump 12 and the first accumulator 15, and the first accumulator 15 is for temporary braking oil liquid.Such as Fig. 1
Shown, in loading machine work, hydraulic pump 12 starts, so that the braking oil liquid in fuel tank 11 is formed under the action of hydraulic pump 12
High-voltage oil liquid, high-voltage oil liquid are entered in the first accumulator 15 by prefill valve 14 and are kept in.As shown in Fig. 2, when being gone
When vehicle is braked, high-voltage oil liquid is directly provided by the first accumulator 15, and high-voltage oil liquid enters dry type system after fluid path control module
In dynamic device 22, the flowing stroke of high-voltage oil liquid can reduce, improve the braking efficiency of braking system, reduce the starting of hydraulic pump 12
Number, to achieve the purpose that reduce energy consumption.
When releasing service brake, as shown in figure 3, the braking oil liquid in dry brake 22 passes sequentially through dry brake 22
Outlet, flow back into fuel tank 11 after fluid path control module, with the low temperature oil liquid combination cooling in fuel tank 11.Load mechanism therewith
The increase of number is moved, the high-voltage oil liquid in the first accumulator 15 is reduced, and braking system can be according to the liquid in the first accumulator 15
Position variation control hydraulic pump 12 starts, to supplement high-voltage oil liquid into the first accumulator 15 in time.
Optionally, the oil outlet of fuel tank 11 can also be connected with filter 13, and filter 13 can be set in hydraulic pump 12
Between prefill valve 14.Pass through 13 impurity screening of filter by the high-voltage oil liquid of hydraulic pump 12, impurity is avoided to enter downstream
Component in, to guarantee the reliability of braking system.
In order to avoid the high-temperature oil liquid being back in fuel tank 11 influences the temperature of 11 inner fluid of fuel tank, so as to cause braking system
Oil liquid temperature in system increases, and can pass through fluid path control module and radiator by the oil liquid of the outlet return of dry brake 22
After 25, entered in fuel tank 11 by the oil return opening of fuel tank 11.By the way that radiator 25 is arranged, the height that dry brake 22 can be made to flow back
Warm oil liquid cools down rapidly, improves heat dissipation effect, the oil liquid temperature in fuel tank 11 is avoided to increase.Optionally, radiator 25 can be set
It sets between fluid path control module and the oil return opening of hydraulic power system 100, i.e. the oil return opening of fluid path control module and fuel tank 11
Between.
In the present embodiment, fluid path control module includes hydraulic brake valve 26 and control valve group 21.Hydraulic brake valve 26 connects
Brake pedal.Control valve group 21 can control the oil outlet (i.e. the outlet of the first accumulator 15) of hydraulic power system 100 and do
The entrance of formula brake 22 is connected to, but also can control the outlet of dry brake 22 and the oil return of hydraulic power system 100
Mouth (i.e. the oil return opening of fuel tank 11) connection, to control service brake and release the flow direction of oil liquid in service braking operation.
Specifically, control valve group 21 includes the first control valve and the second control valve, and the entrance of the first control valve connects dry type
The outlet of brake 22, the oil return opening of the outlet connection fuel tank 11 of the first control valve, to make in releasing service braking operation
At least partly high-temperature oil liquid is back in fuel tank 11 in dry brake 22.
One end of hydraulic brake valve 26 connects the outlet of the first accumulator 15, and the other end connects the entrance of the second control valve,
The entrance of the outlet connection dry brake 22 of second control valve, so as to by the oil outlet of hydraulic power system 100 and dry type system
The entrance connection of dynamic device 22.When service brake, the second control valve is opened, and the first control valve is closed, so that high-voltage oil liquid successively leads to
Enter in dry brake 22 after crossing hydraulic brake valve 26 and the second control valve.When releasing service brake, the second control valve is closed,
First control valve is opened, so that the high-temperature oil liquid in dry brake 22 is back in fuel tank 11.
Optionally, hydraulic brake valve 26 can be triple valve, and a valve port of triple valve and the entrance of the second control valve connect
Logical, remaining two valve port of triple valve are connected to the oil return opening of the outlet of the first accumulator 15 and fuel tank 11 respectively.It stops when trampling
When vehicle pedal, the outlet that the first accumulator 15 is connected in triple valve is connected to two valve ports of the entrance of the second control valve, so that
High-voltage oil liquid enters in dry brake 22.When releasing of brake pedal, connected in triple valve the second control valve entrance and
Two valve ports of the oil return opening of fuel tank 11 are connected to, since the second control valve is closed at this time, so that being located at the second control valve upstream
Residual oil liquid is back in fuel tank 11 by triple valve, and oil liquid is avoided to be detained in braking system.
Optionally, the first control valve can be hydraulic switching valve 211, and the second control valve is overflow valve 212.Specifically, liquid
The valve 211 that compresses switch is two position two-way valve.For convenience of introduction, for the direction shown in Fig. 3, the upper conducting of two position two-way valve, under
Position is introduced for closing.The upper outlet and hydraulic power system that can be connected to dry brake 22 of two position two-way valve
100 oil return opening.The both ends of the pilot valve of two position two-way valve are separately connected the next upstream with overflow valve 212.Work as service brake
When, overflow valve 212 is opened under the pressure effect of oil liquid, so that oil liquid enters in dry brake 22.High-voltage oil liquid enters elder generation
In pilot valve, so that two position two-way valve overcomes the active force of its inner spring under the action of oil liquid, make the bottom point of two position two-way valve
Not Lian Jie the outlet of dry brake 22 and the oil return opening of hydraulic power system 100, avoid oil liquid in dry brake 22 from returning
Stream.When contacting service brake, overflow valve 212 is closed, and the oil liquid of 212 upstream of overflow valve is back in fuel tank 11, bi-bit bi-pass
Valve resets under the action of its inner spring, so that the upper outlet for being separately connected dry brake 22 of two position two-way valve and hydraulic
The oil return opening of dynamical system 100, so that the part oil liquid in dry brake 22 be made to be back in fuel tank 11.
In other embodiments, the second control valve may be check valve.But uniline valve generally bores sealing, if braking system
Unite inner fluid cleannes it is not high, check valve is easy to block so that release service brake when, the entrance of dry brake 22 with
Hydraulic brake valve 26 is connected to, and the oil liquid in dry brake 22 will be flowed back by check valve, can not be by 22 top of dry brake
Outlet return, be unable to reach heat dissipation effect.
In other embodiments, control valve group 21 or other structures, such as the first control valve and the second control valve
It is at least one in electromagnetic switch valve or the first control valve and the second control valve for electromagnetic switch valve, the system as long as guarantee is driven a vehicle
Second control valve is opened when dynamic, the first control valve is closed, and when releasing service brake, the second control valve is closed, the first control valve is opened
It opens.
The service brake of loading machine generally comprises front side wheel braking and rear side wheel braking, for this purpose, doing in the present embodiment
There are two the settings of formula brake 22, one of them is used for front side wheel braking, another is used for rear side wheel braking.Accordingly,
Two service brake driving circuits are provided in hydraulic power system 100 parallel, every service brake driving circuit is provided with
One the first accumulator 15 connecting with prefill valve 14, each service brake driving circuit are correspondingly arranged on a hydraulic braking
Valve 26, control valve group 21 and dry brake 22.Wherein, another hydraulic brake valve 26 is connect with brake pedal, is trampled or loose
When opening brake pedal, two hydraulic brake valves 26 work asynchronously.
In the present embodiment, dry brake 22 includes four calipers 221, and two calipers 221 are one group, each dry type
Two groups of calipers 221 in automation are respectively to the wheel braking of the left and right sides.In order to improve the same of left and right sides wheel braking
Step property, four calipers 221 can be arranged in parallel.Specifically, two calipers 221 in every group are in parallel, two groups of calipers 221
Parallel connection, i.e., four calipers 221 can be in parallel, and two groups of calipers 221 are symmetrical arranged, so that the entrance of dry brake 22 is located at
Braking efficiency is improved so that the distance for making oil liquid enter caliper 221 is short in the middle position of two groups of calipers 221, guarantees four
Caliper 221 works asynchronously, and first brakes to avoid some caliper 221 and abrasion is caused to aggravate, it can avoid the occurrence of dry type
The problem of 22 eccentric wear of brake.
In the present embodiment, braking system further includes parking brake 23 and braking valve for vehicle 24, and hydraulic power system 100 is logical
Braking valve for vehicle 24 is crossed to connect with parking brake 23.At least partly oil liquid warp when parking braking, in parking brake 23
It is back in hydraulic power system 100 after crossing braking valve for vehicle 24 and radiator 25；When releasing parking braking, oil liquid is by hydraulic dynamic
Force system 100 enters in parking brake 23 by braking valve for vehicle 24.
Specifically, as shown in Figure 1, to improve parking braking efficiency, reduce energy consumption, braking system further includes the second accumulator
17, the second accumulator 17 is connect by prefill valve 14 with hydraulic pump 12, to provide high-voltage oil liquid into the second accumulator 17.
Optionally, braking valve for vehicle 24 or triple valve, three of them valve port respectively with the outlet of the second accumulator 17,
The oil return opening and parking brake 23 of fuel tank 11 connect.Specifically, as shown in figure 4, in the present embodiment, braking valve for vehicle 24 is
Two position three-way valve, for the direction shown in Fig. 4, upper permission oil liquid flows to parking brake 23 by the second accumulator 17,
Bottom permission oil liquid is flowed to the oil return opening of fuel tank 11 by parking brake 23.
When parking braking, braking valve for vehicle 24 is located at bottom under the action of its inner spring, in parking brake 23 extremely
Small part oil liquid is back in fuel tank 11 by braking valve for vehicle 24 and radiator 25, so that parking brake 23 is in loading machine
The output flange of gearbox is braked.When releasing parking braking, as shown in figure 5, braking valve for vehicle 24 overcomes its inner spring to make
Firmly be located at it is upper so that the high-voltage oil liquid in the second accumulator 17 can enter parking brake by braking valve for vehicle 24
In 23.At this point, the low temperature oil liquid in fuel tank 11 is mixed with the high-temperature oil liquid in parking brake 23, parking brake can be reduced
The temperature of 23 inner fluids solves the heating problem of oil liquid when parking braking.
Optionally, when parking braking, operator can control braking valve for vehicle 24 by operation parking brake.The present embodiment
In, operator can control the switching of valve position in braking valve for vehicle 24 by button.Operator generates when passing through push button
Electric signal control braking valve for vehicle 24, can substantially reduce the intensity of labourer.
Optionally, parking brake 23 can be using no bar oil pocket, so that the process of parking braking and releasing parking braking
In, the noise of generation is small, can reduce the noise pollution of operator.
In the present embodiment, 24 Chang Weiwei of braking valve for vehicle is the next, i.e. application position.When braking system there are oil leak or other
When problem, braking valve for vehicle 24 will complete the parking braking of loading machine under the action of its inner spring, to avoid the occurrence of safety
Hidden danger.
The course of work of braking system provided in this embodiment is as follows:
As shown in Figure 1, the oil liquid in fuel tank 11 forms high-voltage oil liquid under the action of hydraulic pump 12, high-voltage oil liquid passed through
Enter in the first accumulator 15 and the second accumulator 17 after filter 13 and prefill valve 14 and stores.
As shown in Fig. 2, trampling brake pedal when service brake, hydraulic brake valve 26 overcomes the resistance of its inner spring, so that
The position disposed thereon of hydraulic control valve 26, the i.e. outlet of the first accumulator 15 are connected to overflow valve 212.Height in first accumulator 15
Pressure oil liquid passes through hydraulic brake valve 26, and opens overflow valve 212, to enter in dry brake 22.During this, overflow valve
The high-voltage oil liquid of 212 upstreams will be acted on hydraulic switching valve 211 by pilot valve, so that hydraulic switching valve 211 overcomes in it
The resistance of spring is located at its bottom, i.e. hydraulic switching valve 211 is closed, and prevents the outlet of dry brake 22 and radiator 25 from connecting
It is logical.
As shown in figure 3, releasing of brake pedal, hydraulic brake valve 26 will be in the effect of its inner spring when releasing service brake
It is located at its bottom down, i.e., the upstream of overflow valve 212 is connected to radiator 25, so that the oil liquid of 212 upstream of overflow valve is by heat dissipation
It is back in fuel tank 11 after device 25 is cooling.Simultaneously as the oil liquid of 211 upstream of overflow valve is back to oil by hydraulic brake valve 26
In case 11, so that hydraulic switching valve 211 is located at upper, the i.e. outlet and heat dissipation of dry brake 22 under the action of its inner spring
It is connected between device 25, at least partly oil liquid in dry brake 22 after hydraulic switching valve 211 and radiator 25 by being back to
In fuel tank 11.
As shown in figure 4, operator controls braking valve for vehicle 24 by button when parking braking, braking valve for vehicle 24 is made to exist
It is located at bottom under the action of its inner spring, so that parking brake 23 is connected to fuel tank 11, at least portion in parking brake 23
Oil liquid is divided to be back in fuel tank 11 by braking valve for vehicle 24 and radiator 25, so as to the output flange to loading machine internal speed-changing case
It is braked.
As shown in figure 5, operator controls braking valve for vehicle 24 by button when releasing parking braking, make braking valve for vehicle
24 overcome and are located under the action of its inner spring upper, i.e. the outlet of the second accumulator 17 is connected to parking brake 23.Second stores
High-voltage oil liquid in energy device 17 is entered in parking brake 23 by braking valve for vehicle 24, to release the system to output flange
It is dynamic.
Embodiment two
Present embodiments provide a kind of engineering truck, in embodiment one the difference is that, braking system use
Braking oil liquid is high temperature resistant oil liquid.For dry brake 22 in braking, the temperature of interior brake disc can achieve 200 DEG C or more,
The temperature of 221 inner attrition piece of caliper also can achieve 100 DEG C or more, can by using high temperature resistant oil liquid as working media
With guarantee braking oil liquid will not go bad under this condition of high temperature, blackening, gasification the problems such as, but also brake oil liquid can be made
It is maintained in required range of viscosities, and then guarantees the reliability of braking system.
Embodiment three
A kind of engineering truck is present embodiments provided, the difference is that, in the present embodiment, is made with above-described embodiment
The hydraulic circuit of industry system and the hydraulic circuit of braking system are arranged independently of each other, and braking system uses individual fuel tank 11 for liquid
It presses Force system 100 and hydraulic-driven is provided.Braking system uses individual fuel tank 11, and the liquid of its hydraulic circuit and operating system
Road is pushed back to be independently arranged, can to avoid go bad in braking system because frequently braking, blackening, be mixed with the oil liquid of impurity and moisture into
Enter in operating system, then influences the reliability of operating system；And only braking system high temperature resistant oil liquid can be used, be conducive to
Reduce cost.
Optionally, braking system and operating system can also be controlled individually, be conducive to simplified control system, be controlled more square
Just, be conducive to improve the reliability of engineering truck.
The above is only a preferred embodiment of the present invention, for those of ordinary skill in the art, according to the present invention
Thought, there will be changes in the specific implementation manner and application range, and the content of the present specification should not be construed as to the present invention
Limitation.
Claims (10)
1. a kind of braking system, which is characterized in that including hydraulic power system (100), dry brake (22) and radiator
(25), the hydraulic power system (100) is connect by fluid path control module with the dry brake (22), the fluid path control
Molding block is configured as:
When service brake, it is described dry that the hydraulic power system (100) can drive oil liquid to enter by the fluid path control module
Formula brake (22)；When releasing service brake, at least partly oil liquid in the dry brake (22) passes through the fluid path control
It is back in the hydraulic power system (100) after molding block and the radiator (25).
2. braking system as described in claim 1, which is characterized in that the fluid path control module includes hydraulic brake valve (26)
With control valve group (21), the control valve group (21) is configured as controlling oil outlet and the institute of the hydraulic power system (100)
The connection of the entrance of dry brake (22) is stated, and controls the outlet and the hydraulic power system of the dry brake (22)
Oil return opening connection.
3. braking system as claimed in claim 2, which is characterized in that the control valve group (21) includes the first control valve and the
Two control valves, wherein first control valve one end connects the outlet of the dry brake (22), and the other end connects the liquid
Press the oil return opening of Force system (100)；
Described hydraulic brake valve (26) one end connects the oil outlet of the hydraulic power system (100), other end connection described the
The entrance of two control valves；The outlet of second control valve connects the entrance of the dry brake (22).
4. braking system as claimed in claim 3, which is characterized in that first control valve is hydraulic switching valve (211), institute
Stating the second control valve is overflow valve (212) or hydraulically-controlled one-way valve；Or
First control valve and second control valve are electromagnetic switch valve.
5. braking system as claimed in claim 3, which is characterized in that the hydraulic brake valve (26) be triple valve, described three
One valve port of port valve is connected to second control valve, and the other two valve port of the triple valve is separately connected described hydraulic dynamic
The oil outlet and oil return opening of Force system (100).
6. braking system according to any one of claims 1 to 5, which is characterized in that the radiator (25) is located at the liquid
Between road control module and the oil return opening of the hydraulic power system (100).
7. braking system according to any one of claims 1 to 5, which is characterized in that the dry brake (22) includes four
A caliper (221) connect after four calipers (221) are in parallel with the fluid path control module.
8. braking system according to any one of claims 1 to 5, which is characterized in that the oil liquid in the braking system is resistance to
High-temperature oil liquid.
9. a kind of engineering truck, which is characterized in that including braking system such as of any of claims 1-8.
10. engineering truck as claimed in claim 9, which is characterized in that the engineering truck further includes operating system, the system
The hydraulic circuit of dynamic system and the hydraulic circuit of the operating system are arranged independently of each other.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910275938.7A CN109878482B (en) | 2019-04-08 | 2019-04-08 | Braking system and engineering vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910275938.7A CN109878482B (en) | 2019-04-08 | 2019-04-08 | Braking system and engineering vehicle |
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| CN109878482A true CN109878482A (en) | 2019-06-14 |
| CN109878482B CN109878482B (en) | 2024-02-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910275938.7A Active CN109878482B (en) | 2019-04-08 | 2019-04-08 | Braking system and engineering vehicle |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110588600A (en) * | 2019-09-23 | 2019-12-20 | 山东临工工程机械有限公司 | Air-cooled braking cooling system and loader |
| CN113734123A (en) * | 2021-09-22 | 2021-12-03 | 一汽解放汽车有限公司 | Automatic driving hydraulic braking system |
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| CN109878482B (en) | 2024-02-02 |
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