CN206571853U - Hydraulic control system and construction machinery gear box - Google Patents
Hydraulic control system and construction machinery gear box Download PDFInfo
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- CN206571853U CN206571853U CN201720278776.9U CN201720278776U CN206571853U CN 206571853 U CN206571853 U CN 206571853U CN 201720278776 U CN201720278776 U CN 201720278776U CN 206571853 U CN206571853 U CN 206571853U
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Abstract
The utility model discloses a kind of hydraulic control system and construction machinery gear box, hydraulic control system is used for the folding for controlling the clutch in construction machinery gear box middle gear power train.Hydraulic control system includes hydraulic pump and clutch for clutch control stream, clutch for clutch control stream includes clutch for clutch control valve group and the hydraulic actuator for driving clutch folding, and whether the fluid of the pump discharge of clutch for clutch control valve group control hydraulic pump flows to the actuator port of hydraulic actuator and can control to flow to the oil pressure of the fluid of the actuator port of hydraulic actuator.The clutch for clutch control valve group of hydraulic control system of the present utility model can control to flow to the oil pressure of the actuator port of hydraulic actuator, therefore in the folding of the clutch in controlling construction machinery gear box, it can be become larger by the oil pressure for the actuator port for controlling to flow to hydraulic actuator, so that clutch smooth-going engagement, so that the problem of improving starting or the shift shock that construction machinery gear box of the prior art is present.
Description
Technical field
The utility model is related to engineering machinery field, more particularly to a kind of hydraulic control system and construction machinery gear box.
Background technology
Generally, construction machinery gear box includes torque converter, pinion unit and hydraulic control system.Hydraulic control system root
The gear selected according to driver controls the engagement or disengagement of clutch in pinion unit.Due in above-mentioned hydraulic control system
Be used for control the magnetic valve of engagement or disengagement of clutch only to play a part of a switch reversal valve, it is impossible to enter clutch
Row is smoothly engaged, therefore construction machinery gear box of the prior art also has significant starting and shift shock.In addition, long
The starting of time and shift shock can cause the damage of the friction material in clutch.
Utility model content
The purpose of this utility model is to provide a kind of hydraulic control system and construction machinery gear box, to improve existing skill
The problem of starting of construction machinery gear box presence in art or shift shock.
The utility model first aspect provides a kind of hydraulic control system, for controlling construction machinery gear box middle gear to pass
The folding of clutch in dynamic system, the hydraulic control system includes hydraulic pump and clutch for clutch control stream, the clutch for clutch control stream
Road includes clutch for clutch control valve group and the hydraulic actuator for driving the clutch folding, the clutch for clutch control valve group control
Whether the fluid of the pump discharge of the hydraulic pump flows to the actuator port of the hydraulic actuator and flow direction can be controlled described
The oil pressure of the fluid of the actuator port of hydraulic actuator.
Further, the hydraulic control system includes coupling the controller set with the clutch for clutch control valve group, described
Controller control clutch for clutch control valve group action adjust the hydraulic actuator actuator port whether oil-feed and described
Oil pressure.
Further, the clutch for clutch control stream includes being used to drive at least two of at least two gear clutch foldings
Hydraulic actuator for controlling gear, the clutch for clutch control valve group include be used for control described at least two be used for control keep off
First clutch for clutch control valve group of the hydraulic actuator action of position, the first clutch for clutch control valve group includes oil inlet and at least two
Individual oil-out, the oil inlet of the first clutch for clutch control valve group is connected with the pump discharge, the first clutch for clutch control valve group
At least two oil-outs are used to control the actuator port of the hydraulic actuator of gear is corresponding to connect with described at least two, described
The oil pressure of at least two oil-outs of the first clutch for clutch control valve group is adjustably set；And/or, the clutch for clutch control stream includes
For driving the advance hydraulic actuator of forward clutch folding and for driving the retrogressing hydraulic pressure of back clutch folding to hold
Units, the clutch for clutch control valve group includes being used to control the advance hydraulic actuator and retreats hydraulic actuator action
The second clutch for clutch control valve group, the second clutch for clutch control valve group include oil inlet, the first oil-out and the second oil-out, it is described
The oil inlet of second clutch for clutch control valve group is connected with the pump discharge, the first oil-out of the second clutch for clutch control valve group and institute
State the actuator port connection of advance hydraulic actuator, the second oil-out of the second clutch for clutch control valve group and the retrogressing liquid
Press the actuator port connection of executive component, the first oil-out of the second clutch for clutch control valve group and the second clutch for clutch control valve
The oil pressure of second oil-out of group is adjustably set.
Further, the first clutch for clutch control valve group includes the first oil pressure adjusting valve and is used to control with described at least two
At least two shift control valves that the hydraulic actuator of gear processed is correspondingly arranged, first oil pressure adjusting valve includes the first oil
Mouth is with the second hydraulic fluid port and with oil pressure cntrol end, and the oil pressure of second hydraulic fluid port is adjusted by the oil pressure cntrol end, first oil
First hydraulic fluid port of pressure regulating valve is connected with the oil inlet of the first clutch for clutch control valve group, and the shift control valve includes the first oil
Mouth and the second hydraulic fluid port, the first hydraulic fluid port of the shift control valve is connected with the second hydraulic fluid port of first oil pressure adjusting valve, described
Second hydraulic fluid port of shift control valve is connected with the corresponding oil-out at least two oil-outs of the first clutch for clutch control valve group；
And/or, the second clutch for clutch control valve group includes the second oil pressure adjusting valve and directional control valve, the second oil pressure adjusting valve bag
Include the first hydraulic fluid port and the second hydraulic fluid port and with oil pressure cntrol end, the oil pressure of second hydraulic fluid port is adjusted by the oil pressure cntrol end, institute
Stating directional control valve includes the first hydraulic fluid port, the second hydraulic fluid port and the 3rd hydraulic fluid port, and the directional control valve controls its first hydraulic fluid port optional
Connected with one in its second hydraulic fluid port and the 3rd hydraulic fluid port with selecting, the first hydraulic fluid port of second oil pressure adjusting valve and described second
The oil inlet connection of clutch for clutch control valve group, the second hydraulic fluid port of second oil pressure adjusting valve and the first oil of the directional control valve
Mouth connection, the second hydraulic fluid port of the directional control valve is connected with the first oil-out of the second clutch for clutch control valve group, the side
It is connected to the 3rd hydraulic fluid port of control valve with the second oil-out of the second clutch for clutch control valve group.
Further, the hydraulic control system also includes coupling the controller set with the clutch for clutch control valve group, its
In, the controller controls the oil pressure cntrol end of first oil pressure adjusting valve to be used to control gear to adjust described at least two
Hydraulic actuator actuator port oil pressure；And/or, the controller controls the oil pressure control of second oil pressure adjusting valve
End processed is to adjust the oil pressure of the actuator port of the advance hydraulic actuator or the retrogressing hydraulic actuator.
Further, the controller controls at least two shift controls valve events engineering machinery is become
Fast case is in setting gear, and the controller controls the oil pressure of the second hydraulic fluid port of first oil pressure adjusting valve in setting gear
When it is different from remaining gear.
Further, the scope of the oil pressure of the second hydraulic fluid port of first oil pressure adjusting valve is 0-20bar；And/or, it is described
The scope of the oil pressure of second hydraulic fluid port of the second oil pressure adjusting valve is 0-20bar.
Further, the hydraulic control system also includes pressure limiting stream, and the pressure limiting stream includes pressure on-off valve, institute
Stating pressure on-off valve includes the first hydraulic fluid port and the second hydraulic fluid port, the first hydraulic fluid port of the pressure on-off valve and pumping out for the hydraulic pump
Mouth connection, the second hydraulic fluid port of the pressure on-off valve is connected with oil extraction, and the pressure on-off valve reaches in the oil pressure of the pump discharge
First hydraulic fluid port is controlled to be connected with second hydraulic fluid port during to certain value.
Further, the pressure limiting stream also includes hydraulic oil radiator, and the second hydraulic fluid port of the pressure on-off valve passes through
The hydraulic oil radiator is connected with oil extraction.
The utility model second aspect provides a kind of construction machinery gear box, including pinion unit and such as the utility model
The hydraulic control system that any one of first aspect is provided, the hydraulic actuator of the hydraulic control system drives the gear to pass
Clutch folding in dynamic system.
The hydraulic control system and construction machinery gear box provided based on the utility model, hydraulic control system is used to control
The folding of clutch in construction machinery gear box middle gear power train.Hydraulic control system includes hydraulic pump and clutch for clutch control stream
Road, clutch for clutch control stream includes clutch for clutch control valve group and the hydraulic actuator for driving clutch folding, clutch for clutch control valve
Whether the fluid of the pump discharge of group control hydraulic pump, which flows to the actuator port of hydraulic actuator and can control to flow to hydraulic pressure, is held
The oil pressure of the fluid of the actuator port of units.The clutch for clutch control valve group of hydraulic control system of the present utility model being capable of controlling stream
, can to the oil pressure of the actuator port of hydraulic actuator, therefore in the folding of the clutch in controlling construction machinery gear box
Become larger with the oil pressure by the actuator port for controlling to flow to hydraulic actuator so that clutch smooth-going engagement, so as to change
The problem of starting of kind construction machinery gear box presence of the prior art or shift shock.
It is of the present utility model other by referring to the drawings to the detailed description of exemplary embodiment of the present utility model
Feature and its advantage will be made apparent from.
Brief description of the drawings
Accompanying drawing described herein is used for providing further understanding to of the present utility model, constitutes the part of the application,
Schematic description and description of the present utility model is used to explain the utility model, does not constitute to of the present utility model improper
Limit.In the accompanying drawings：
Fig. 1 is the structural representation of hydraulic control system of the present utility model.
1- the first clutch for clutch control valve groups；11- first gear level control valves；12- second gear level control valves；The control of 13- third gear position
Valve processed；The oil pressure adjusting valves of 14- first；C1- mono- keeps off hydraulic cylinder；C2- bis- keeps off hydraulic cylinder；C3- tri- keeps off hydraulic cylinder；2- the second clutch controls
Valve group processed；21- directional control valves；The oil pressure adjusting valves of 24- second；Inlet hydraulic cylinder before CF-；CR- retreats hydraulic cylinder；3- pressure break-makes
Valve；4- hydraulic pumps；P- pump discharges；5- cleaners；6- hydraulic oil radiators.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is carried out
Clearly and completely describe, it is clear that described embodiment is only a part of embodiment of the utility model, rather than whole
Embodiment.The description only actually at least one exemplary embodiment is illustrative below, never as to this practicality
New and its application or any limitation used.Based on the embodiment in the utility model, those of ordinary skill in the art are not having
There is the every other embodiment made and obtained under the premise of creative work, belong to the scope of the utility model protection.
Unless specifically stated otherwise, the part and positioned opposite, the digital table of step otherwise illustrated in these embodiments
Scope of the present utility model is not limited up to formula and numerical value.Simultaneously, it should be appreciated that each shown in accompanying drawing for the ease of description
The size of individual part is not to be drawn according to actual proportionate relationship.For skill known to person of ordinary skill in the relevant
Art, method and apparatus may be not discussed in detail, but in the appropriate case, the technology, method and apparatus should be considered as awarding
Weigh a part for specification.In shown here and discussion all examples, any occurrence should be construed as merely example
Property, not as limitation.Therefore, the other examples of exemplary embodiment can have different values.It should be noted that：It is similar
Label and letter similar terms is represented in following accompanying drawing, therefore, once be defined in a certain Xiang Yi accompanying drawing, then with
It need not be further discussed in accompanying drawing afterwards.
For the ease of description, space relative terms can be used herein, such as " ... on ", " ... top ",
" ... upper surface ", " above " etc., for describing such as a device shown in the figure or feature and other devices or spy
The spatial relation levied.It should be appreciated that space relative terms are intended to comprising the orientation except device described in figure
Outside different azimuth in use or operation.If for example, the device in accompanying drawing is squeezed, be described as " in other devices
It will be positioned as " under other devices or construction after the device of part or construction top " or " on other devices or construction "
Side " or " under other devices or construction ".Thus, exemplary term " ... top " can include " ... top " and
" in ... lower section " two kinds of orientation.The device can also the positioning of other different modes, it is and relative to space used herein above
Respective explanations are made in description.
The hydraulic control system of the utility model embodiment, for controlling in construction machinery gear box middle gear power train
The folding of clutch.The hydraulic control system of the utility model embodiment includes hydraulic pump and clutch for clutch control stream.Clutch for clutch control
Stream includes clutch for clutch control valve group and the hydraulic actuator for driving clutch folding.Clutch for clutch control valve group controls hydraulic pump
The fluid of pump discharge whether flow to the actuator port of hydraulic actuator and can control to flow to the work of hydraulic actuator
The oil pressure of hydraulic fluid port.The clutch for clutch control valve group of the hydraulic control system of the utility model embodiment, which can control to flow to hydraulic pressure, performs member
The oil pressure of the actuator port of part, therefore in the folding of the clutch in controlling construction machinery gear box, controlling stream can be passed through
Become larger to the oil pressure of the actuator port of hydraulic actuator so that clutch smooth-going engagement, so as to improve in the prior art
The starting that exists of construction machinery gear box or the problem of shift shock.The starting of construction machinery gear box or asking for shift shock
Topic improves the abrasion for being beneficial to reduce the friction material in clutch, and then lifting operation comfortableness and product reliability.
The structure of the hydraulic control system of the specific embodiment of the utility model one will be carried out specifically according to Fig. 1 below
It is bright.
In the present embodiment, construction machinery gear box be three gear gearboxes, therefore hydraulic control system include be used for and three
The clutch of individual gear is correspondingly arranged and controls three shifting position hydraulic cylinders of correspondence clutch folding, respectively one gear hydraulic cylinder
C1, two gear hydraulic cylinder C2 and three gear hydraulic cylinder C3.And hydraulic control system also includes being used for controlling forward clutch folding
The preceding inlet hydraulic cylinder CF and retrogressing hydraulic cylinder CR for controlling back clutch folding.
However, it is desirable to which explanation, the hydraulic control system of the utility model embodiment is not limited to for controlling three gears
Gearbox in clutch folding, can be also used for that the gear of control two is following and gearboxes of the four gear above in clutches
Folding.
As shown in figure 1, clutch for clutch control stream includes being used for three that drive three gear clutch foldings for controlling gear
The hydraulic cylinder of position.Three hydraulic cylinders for being used to control gear are respectively a gear hydraulic cylinder C1, two gear hydraulic cylinder C2 and three gear hydraulic pressure
Cylinder C3.Clutch for clutch control valve group includes being used to control three for controlling the first clutch for clutch control valve group 1 that the hydraulic cylinder of gear is acted.
First clutch for clutch control valve group 1 includes oil inlet and three oil-outs.The oil inlet of first clutch for clutch control valve group 1 and hydraulic pump 4
Pump discharge P connections.Three oil-outs of the first clutch for clutch control valve group 1 and three actuator ports for being used to control the hydraulic cylinder of gear
Correspondence connection, the oil pressure of three oil-outs of the first clutch for clutch control valve group 1 is adjustably set.First clutch for clutch control valve group 1
The oil pressure of three oil-outs is adjustably set, therefore three are used to control the oil pressure of the actuator port of the hydraulic cylinder of gear adjustable
Save land setting, therefore in gearshift, it is possible to regulation is in each gear, the pressure of each gear clutch engagement, so that
The smooth-going engagement of each gear clutch is obtained, impact is reduced.
As shown in figure 1, in the present embodiment, clutch for clutch control stream includes the preceding feed liquor for being used to drive forward clutch folding
The cylinder pressure CF and retrogressing hydraulic cylinder CR for driving back clutch folding.Clutch for clutch control valve group includes being used to control advance hydraulic pressure
Cylinder CF and the second clutch for clutch control valve group 2 for retreating hydraulic cylinder CR actions.Second clutch for clutch control valve group 2 goes out including oil inlet, first
Hydraulic fluid port and the second oil-out.The oil inlet of second clutch for clutch control valve group 2 is connected with the pump discharge of hydraulic pump 4, the second clutch for clutch control
First oil-out of valve group 2 is connected with preceding inlet hydraulic cylinder CF actuator port, the second oil-out of the second clutch for clutch control valve group 2 with
Retreat hydraulic cylinder CR actuator port connection.First oil-out of the second clutch for clutch control valve group 2 and the second clutch for clutch control valve group
The oil pressure of second oil-out is adjustably set.First oil-out of the second clutch for clutch control valve group 2 and the second clutch for clutch control valve group
The oil pressure of the second oil-out adjustably set, therefore the oil pressure of preceding inlet hydraulic cylinder CF actuator port and retreat hydraulic cylinder
The oil pressure of CR actuator port is adjustably set, therefore when changing the direction of travel of engineering truck, can also pass through regulation
Oil pressure causes forward clutch or back clutch to smooth out engagement to make the activating pressure of forward clutch or back clutch,
Reduce impact.
Specifically, as shown in figure 1, the first clutch for clutch control valve group 1 includes the first oil pressure adjusting valve 14 and is used to control with three
Three shift control valves that the hydraulic cylinder of gear processed is correspondingly arranged.Three shift control valves be respectively first gear level control valve 11,
Second gear level control valve 12 and third gear level control valve 13.First gear level control valve 11 is used to control one to keep off the dynamic of hydraulic cylinder C1
Make, second gear level control valve 12 is used to control two actions for keeping off hydraulic cylinder C2, and third gear level control valve 13 is used to control three to keep off liquid
Cylinder pressure C3 action.First oil pressure adjusting valve 14 includes the first hydraulic fluid port and the second hydraulic fluid port and with oil pressure cntrol end, the second hydraulic fluid port
Oil pressure by the oil pressure cntrol end adjust.Shift control valve includes the first hydraulic fluid port and the second hydraulic fluid port.First oil pressure adjusting valve 14
First hydraulic fluid port is connected with the oil inlet of the first clutch for clutch control valve group, the second hydraulic fluid port and the shift control valve of the first oil pressure adjusting valve 14
The first hydraulic fluid port connection, the second hydraulic fluid port of shift control valve with it is corresponding fuel-displaced in three oil-outs of the first clutch for clutch control valve group
Mouth connection.When being shifted gears, corresponding shift control valve events are first controlled to cause the second hydraulic fluid port of the first oil pressure adjusting valve 14
Connected with the actuator port of corresponding shifting position hydraulic cylinder, then controlling the oil pressure cntrol end of the first oil pressure adjusting valve 14 makes the first oil
Press the oil pressure of the second hydraulic fluid port of regulating valve 14 to incrementally increase, and then incrementally increase the pressure of the actuator port of shifting position hydraulic cylinder,
Therefore the clutch of corresponding gear can smooth out engagement.
Preferably, the first oil pressure adjusting valve is ratio adjusting valve.Controller can be according to the instruction received to the first oil
The oil pressure of the second hydraulic fluid port of regulating valve is pressed adjusted in ratio.
Specifically, in the present embodiment, the structure of three shift control valves is identical, comes by taking first gear level control valve 11 as an example
Illustrate the structure of shift control valve.First gear level control valve 11 includes the first hydraulic fluid port, the second hydraulic fluid port and oil discharge outlet and with first
Working position (upper) and the second working position (bottom).In the first working position, the cut-off of the first hydraulic fluid port, the second hydraulic fluid port connects with oil discharge outlet
It is logical.In the second working position, the first hydraulic fluid port is connected with the second hydraulic fluid port, oil discharge outlet cut-off.Therefore, when driver wants a gear traveling,
First gear level control valve 11 is controlled to be in the second working position.Certainly, when first gear level control valve 11 is in the second working position,
Second gear level control valve 12 and third gear level control valve 13 are in the first working position.
Second clutch for clutch control valve group 2 includes the second oil pressure adjusting valve 24 and directional control valve 21.Second oil pressure adjusting valve 24
Including the first hydraulic fluid port and the second hydraulic fluid port and with oil pressure cntrol end, the oil pressure of the second hydraulic fluid port is adjusted by the oil pressure cntrol end.Direction
Control valve 21 include the first hydraulic fluid port, the second hydraulic fluid port and the 3rd hydraulic fluid port, directional control valve 21 control its first hydraulic fluid port selectively with
A connection in its second hydraulic fluid port and the 3rd hydraulic fluid port, the first hydraulic fluid port of the second oil pressure adjusting valve and the second clutch for clutch control valve group
Oil inlet is connected, and the first hydraulic fluid port of the second hydraulic fluid port of the second oil pressure adjusting valve and directional control valve is connected, and the of directional control valve
Two hydraulic fluid ports are connected with the first oil-out of the second clutch for clutch control valve group, the 3rd hydraulic fluid port and the second clutch for clutch control valve of directional control valve
The second oil-out connection of group.Driver controls the direction that engineering truck is travelled by control direction control valve.
Specifically, as shown in figure 1, directional control valve 21 includes the first hydraulic fluid port, the second hydraulic fluid port, the 3rd hydraulic fluid port and oil discharge outlet.
Wherein, the first hydraulic fluid port of directional control valve 21 is connected with the second hydraulic fluid port of the second oil pressure adjusting valve 24, and the of directional control valve 21
Two hydraulic fluid ports are connected with the actuator port of preceding inlet hydraulic cylinder, the 3rd hydraulic fluid port of directional control valve 21 and the actuator port for retreating hydraulic cylinder
Connection.Directional control valve 21 has the first working position and the second working position.In the first working position, the first oil of directional control valve 21
Mouth is connected with the 3rd hydraulic fluid port, and the second hydraulic fluid port of directional control valve 21 is connected with oil discharge outlet；In the second working position, directional control valve 21
The first hydraulic fluid port connected with the second hydraulic fluid port, the 3rd hydraulic fluid port of directional control valve 21 is connected with oil discharge outlet.Therefore, driver want to
During preceding traveling, control direction control valve is in the second working position, it is desirable to when travelling backward, and control direction control valve is in the first work
Make position.
Preferably, hydraulic control system also includes couple the controller set with clutch for clutch control valve group, and controller controls the
The oil pressure cntrol end of one oil pressure adjusting valve with adjust three be used for control gear hydraulic cylinder actuator port oil pressure.And control
Device processed controls the oil pressure cntrol end of the second oil pressure adjusting valve with inlet hydraulic cylinder before adjusting or the oil for the actuator port for retreating hydraulic cylinder
Pressure.Controller automatically adjusts the oil pressure cntrol end of the first oil pressure adjusting valve and the oil pressure cntrol end of the second oil pressure adjusting valve, regulation
Precision and regulation efficiency are higher.
More preferably, controller control three shift control valve events with control construction machinery gear box be in setting gear and
Controller control the first oil pressure adjusting valve the second hydraulic fluid port oil pressure set gear when from remaining gear when it is different.In engineering
When mechanical gear box is in different gears, controller controls the oil pressure of the second hydraulic fluid port of the first oil pressure adjusting valve different to adapt to not
With the driving cycle of gear.
Preferably, the scope of the oil pressure of the second hydraulic fluid port of the first oil pressure adjusting valve is 0-20bar.Second oil pressure adjusting valve
The scope of the oil pressure of second hydraulic fluid port is 0-20bar.
As shown in figure 1, the hydraulic control system of the present embodiment also includes pressure limiting stream, pressure limiting stream includes pressure on-off valve
3.Pressure on-off valve 3 includes the first hydraulic fluid port and the second hydraulic fluid port, and the first hydraulic fluid port of pressure on-off valve 3 connects with the pump discharge P of hydraulic pump 4
Connect, the second hydraulic fluid port of pressure on-off valve 3 is connected with oil extraction, the first hydraulic fluid port of the control pressure on-off valve 3 of pressure on-off valve 3 is being pumped out
Mouthful oil pressure reach during certain value and to be connected with the second hydraulic fluid port.Therefore, can when the oil pressure of the pump discharge of hydraulic pump 4 reaches certain value
Directly to carry out oil extraction by pressure on-off valve 3, without by clutch for clutch control oil circuit, so as to play the work of limitation system pressure
With.
Preferably, pressure limiting oil circuit also includes hydraulic oil radiator 6.Second hydraulic fluid port of pressure on-off valve 3 is dissipated by hydraulic oil
Hot device 6 is connected with oil extraction.Hydraulic pump 4 draws fluid by cleaner 5 from gearbox drain pan, and passes through the He of pressure on-off valve 3
Hydraulic oil radiator 6 returns to gearbox, and cooling lubrication is carried out to the element in gearbox.
Specifically, pressure on-off valve 3 has the first working position and the second working position and controlled including the first control end and second
End processed.In the first working position, its first hydraulic fluid port and the second hydraulic fluid port disconnect；In the second working position, its first hydraulic fluid port and the second oil
Mouth connection.Wherein, the first control end is connected with its first hydraulic fluid port, and the second control end is spring control end and by throttle orifice and the
Two hydraulic fluid ports are connected.When the oil pressure of the first control end is more than the oil pressure of the second control end, pressure on-off valve 3 is in the second work
Position, and now, its first hydraulic fluid port connects to enable hydraulic oil to flow back into gearbox with the second hydraulic fluid port.
The control method of the hydraulic control system of the present embodiment is specifically described below：
The control method of hydraulic control system based on the present embodiment comprises the following steps：Control the action of clutch for clutch control valve group
Come the oil pressure of the actuator port that adjusts hydraulic actuator.The clutch for clutch control valve group of hydraulic control system of the present utility model can
Control flows to the oil pressure of the actuator port of hydraulic actuator, therefore the folding of the clutch in control construction machinery gear box
When, can by control clutch for clutch control valve group action come adjust the oil pressure for the actuator port for flowing to hydraulic actuator and make its by
Gradual change is big so that clutch smooth-going engagement, so as to improve starting or gearshift that construction machinery gear box of the prior art is present
The problem of impact.
Control method is additionally included in selection setting gear and direction initialization before the valve group action of control clutch for clutch control.Control from
Close the action of control valve group and include the first clutch for clutch control valve group of control and act to control gear and adjust liquid for controlling gear
Press the oil pressure of executive component.The action of the second clutch for clutch control valve group is controlled to be held with control direction and adjusting for the hydraulic pressure of control direction
The oil pressure of units.
Preferably, in order to adapt to the driving cycle under different gears, the control method of the present embodiment is included in control clutch
Control valve group is different when acting to cause the oil pressure of the actuator port of hydraulic actuator when setting gear from remaining gear.
Preferably, control the first clutch for clutch control valve group action enter setting gear after, after 0.1-1s control second from
Close control valve group action and enter direction initialization.Forward clutch or back clutch are utilized during the engineering truck starting of the present embodiment
The first clutch for clutch control valve group is being controlled to act into after setting gear simultaneously as the control method of starting clutch, therefore the present embodiment
Delay 0.1-1s after control again the second clutch for clutch control valve group action enter direction initialization beneficial to ensure forward clutch or after
It is used to control the clutch of gear to be fully engaged to avoid connecing in forward clutch or back clutch before recessing clutch engagement
Be used to controlling the clutch of gear not to be fully engaged also after conjunction and it is impaired on the basis of be beneficial to ensure that starting is rapider, improve behaviour
Vertical comfortableness.
It will be detailed below the control method of the hydraulic control system of the present embodiment：
When operator does not provide travel direction and shift signal, vehicle middle position idling.Now, in hydraulic control system
Shift control valve, directional control valve, the first oil pressure adjusting valve 14 and the second oil pressure adjusting valve 24 be not under control device
Instruction, hydraulic pump 4 draws fluid by cleaner 5 from the oil sump of construction machinery gear box, in the oil of the pump discharge of hydraulic pump 4
Liquid reached after certain pressure, and the working position of pressure on-off valve 3 is converted to upper, and hydraulic oil returns to speed change by fluid radiator 6
In case, cooling lubrication is carried out to the element in gearbox.
When driver wants forward gear traveling, first gear level control valve 11 and directional control valve 21 obtain controller
Instruction, the working position of first gear level control valve 11 is converted to bottom, and the working position of directional control valve 21 is converted to upper.And the
The working position of one oil pressure adjusting valve 14 is converted to the next and adjusts the actuator port of a gear hydraulic cylinder C1 by a gear setting ratio
Pressure make a gear clutch smooth-going engagement.After the first oil pressure adjusting valve 14 action 0.1-1s, controller controls the second oil pressure
The working position of regulating valve 24 is converted to bottom, then the oil pressure of inlet hydraulic cylinder CF actuator port causes before adjusting by setting ratio
Forward clutch smooth-going engagement, so that engineering truck gentle start, forward gear traveling.During remaining forward range direction running,
Control method is essentially identical, repeats no more.
When driver wants to retreat a gear traveling, first gear level control valve 11 and directional control valve 21 obtain controller
Instruction, the working position of first gear level control valve 11 is converted to bottom, the work invariant position of directional control valve 21.And the first oil pressure
The working position of regulating valve 14 is converted to the next and adjusts the pressure of the actuator port of a gear hydraulic cylinder C1 by a gear setting ratio
Make gear clutch smooth-going engagement.After the first oil pressure adjusting valve 14 action 0.1-1s, controller controls the second oil pressure adjusting valve
24 working position is converted to bottom, then before adjusting by setting ratio the oil pressure of inlet hydraulic cylinder CF actuator port to advance from
Clutch smooth-going engagement, so that engineering truck gentle start, retreats a gear traveling.
When driver switches to the gear of retrogressing one to travel by forward gear traveling, directional control valve 21 obtains the finger of controller
Order, working position is converted to bottom, and the working position of the second oil pressure adjusting valve 24 is converted to upper, forward clutch disengagement, engineering truck
Shut down.Now, then by the working position of the second oil pressure adjusting valve 24 be converted to bottom and retreat hydraulic cylinder by setting ratio regulation
The pressure of CR actuator port makes back clutch smooth engagement, and engineering truck gentle start retreats a gear traveling, so as to complete
Direction cut is made.
When driver switches to the gear of advance two to travel by forward gear traveling, first gear level control valve 11, the second gear
The oil pressure adjusting valve 14 of control valve 12 and first obtains the instruction of controller, and the working position of first gear level control valve 11 is converted to
Position, a gear throw-out-of clutch.The working position of second gear level control valve 12 is converted to the next and the first oil pressure adjusting valve 14 of control
Working position is converted to the next and adjusts the pressure of two actuator ports for keeping off hydraulic cylinder so that two gear clutch smooth and steadies by setting ratio
Engagement, engineering truck is just converted to two gears traveling, so as to complete gear switching.
Finally it should be noted that：Above example is only to illustrate the technical solution of the utility model rather than it is limited
System；Although the utility model is described in detail with reference to preferred embodiment, those of ordinary skill in the art should
Understand：Still embodiment of the present utility model can be modified or some technical characteristics are equally replaced
Change；Without departing from the spirit of technical solutions of the utility model, it all should cover in the claimed technical scheme of the utility model
Among scope.
Claims (10)
1. a kind of hydraulic control system, the folding for controlling the clutch in construction machinery gear box middle gear power train, its
It is characterised by, the hydraulic control system includes hydraulic pump and clutch for clutch control stream, the clutch for clutch control stream includes clutch control
Valve group processed and the hydraulic actuator for driving the clutch folding, the clutch for clutch control valve group control the hydraulic pump
(5) whether the fluid of pump discharge (P) flows to the actuator port of the hydraulic actuator and can control to flow to the hydraulic pressure
The oil pressure of the fluid of the actuator port of executive component.
2. hydraulic control system according to claim 1, it is characterised in that the hydraulic control system include with it is described from
The controller that control valve group coupling is set is closed, the controller controls the clutch for clutch control valve group action to be held to adjust the hydraulic pressure
The actuator port of units whether oil-feed and the oil pressure.
3. hydraulic control system according to claim 1, it is characterised in that the clutch for clutch control stream includes being used to drive
At least two of at least two gear clutch foldings are used for the hydraulic actuator for controlling gear, the clutch for clutch control valve group bag
Include for controlling described at least two the first clutch for clutch control valve groups (1) for being used to control the hydraulic actuator of gear to act, institute
Stating the first clutch for clutch control valve group (1) includes oil inlet and at least two oil-outs, the oil-feed of the first clutch for clutch control valve group (1)
Mouth is connected with the pump discharge, and at least two oil-outs of the first clutch for clutch control valve group (1) are used for described at least two
The actuator port correspondence of the hydraulic actuator of gear is controlled to connect, at least two of the first clutch for clutch control valve group (1) goes out
The oil pressure of hydraulic fluid port is adjustably set；And/or, the clutch for clutch control stream includes the advance for being used to drive forward clutch folding
Hydraulic actuator and the retrogressing hydraulic actuator for driving back clutch folding, the clutch for clutch control valve group include using
In controlling the advance hydraulic actuator and retreat the second clutch for clutch control valve group (2) of hydraulic actuator action, described the
Two clutch for clutch control valve groups (2) include oil inlet, the first oil-out and the second oil-out, the second clutch for clutch control valve group (2)
Oil inlet is connected with the pump discharge, and the first oil-out and the advance hydraulic pressure of the second clutch for clutch control valve group (2) are performed
The actuator port connection of element, the second oil-out and the retrogressing hydraulic actuator of the second clutch for clutch control valve group (2)
Actuator port connection, the first oil-out of the second clutch for clutch control valve group (2) and the second clutch for clutch control valve group (2)
The oil pressure of second oil-out is adjustably set.
4. hydraulic control system according to claim 3, it is characterised in that the first clutch for clutch control valve group (1) includes
First oil pressure adjusting valve (14) and with described at least two be used to controlling the hydraulic actuator of gear to be correspondingly arranged at least two
Individual shift control valve, first oil pressure adjusting valve (14) includes the first hydraulic fluid port and the second hydraulic fluid port and with oil pressure cntrol end, institute
The oil pressure for stating the second hydraulic fluid port is adjusted by the oil pressure cntrol end, the first hydraulic fluid port and described first of first oil pressure adjusting valve (14)
The oil inlet connection of clutch for clutch control valve group, the shift control valve includes the first hydraulic fluid port and the second hydraulic fluid port, the shift control valve
The first hydraulic fluid port be connected with the second hydraulic fluid port of first oil pressure adjusting valve (14), the second hydraulic fluid port of the shift control valve and institute
State the corresponding oil-out connection at least two oil-outs of the first clutch for clutch control valve group；And/or, the second clutch for clutch control valve
Group (2) includes the second oil pressure adjusting valve (24) and directional control valve (21), and second oil pressure adjusting valve (24) includes the first oil
Mouth is with the second hydraulic fluid port and with oil pressure cntrol end, and the oil pressure of second hydraulic fluid port is adjusted by the oil pressure cntrol end, the direction control
Valve (21) processed includes the first hydraulic fluid port, the second hydraulic fluid port and the 3rd hydraulic fluid port, and the directional control valve (21) controls its first hydraulic fluid port optional
Connected with one in its second hydraulic fluid port and the 3rd hydraulic fluid port with selecting, the first hydraulic fluid port of second oil pressure adjusting valve (24) with it is described
The oil inlet connection of second clutch for clutch control valve group, the second hydraulic fluid port and the directional control valve of second oil pressure adjusting valve (24)
The connection of the first hydraulic fluid port, the second hydraulic fluid port of the directional control valve (21) and the first oil-out of the second clutch for clutch control valve group
Connection, the 3rd hydraulic fluid port of the directional control valve (21) is connected with the second oil-out of the second clutch for clutch control valve group.
5. hydraulic control system according to claim 4, it is characterised in that the hydraulic control system also include with it is described
The controller that the coupling of clutch for clutch control valve group is set, wherein, the controller controls the oil pressure of first oil pressure adjusting valve (14)
Control end with adjust described at least two be used for control gear hydraulic actuators actuator port oil pressure；And/or, it is described
Controller controls the oil pressure cntrol end of second oil pressure adjusting valve (24) to adjust the advance hydraulic actuator or described
Retreat the oil pressure of the actuator port of hydraulic actuator.
6. hydraulic control system according to claim 5, it is characterised in that controller control at least two gear
Level control valve action is to cause the construction machinery gear box to be in setting gear, and the controller controls first oil pressure
The oil pressure of second hydraulic fluid port of regulating valve set gear when from remaining gear when it is different.
7. hydraulic control system according to claim 4, it is characterised in that the second of first oil pressure adjusting valve (14)
The scope of the oil pressure of hydraulic fluid port is 0-20bar；And/or, the scope of the oil pressure of the second hydraulic fluid port of second oil pressure adjusting valve (24)
For 0-20bar.
8. hydraulic control system according to any one of claim 1 to 7, it is characterised in that the hydraulic control system
Also include pressure limiting stream, the pressure limiting stream include pressure on-off valve (3), the pressure on-off valve (3) include the first hydraulic fluid port and
Second hydraulic fluid port, the first hydraulic fluid port of the pressure on-off valve (3) is connected with the pump discharge (P) of the hydraulic pump, the pressure break-make
Second hydraulic fluid port of valve is connected with oil extraction, and the pressure on-off valve (3) controls institute when the oil pressure of the pump discharge reaches certain value
The first hydraulic fluid port is stated to connect with second hydraulic fluid port.
9. hydraulic control system according to claim 8, it is characterised in that the pressure limiting stream also includes hydraulic oil and radiated
Device (6), the second hydraulic fluid port of the pressure on-off valve (3) is connected by the hydraulic oil radiator (6) with oil extraction.
10. a kind of construction machinery gear box, it is characterised in that including pinion unit and such as any one of claim 1 to 9 institute
The hydraulic control system stated, the hydraulic actuator of the hydraulic control system drives the clutch in the pinion unit to open
Close.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720278776.9U CN206571853U (en) | 2017-03-22 | 2017-03-22 | Hydraulic control system and construction machinery gear box |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720278776.9U CN206571853U (en) | 2017-03-22 | 2017-03-22 | Hydraulic control system and construction machinery gear box |
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| CN206571853U true CN206571853U (en) | 2017-10-20 |
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| CN201720278776.9U Active CN206571853U (en) | 2017-03-22 | 2017-03-22 | Hydraulic control system and construction machinery gear box |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108626270A (en) * | 2017-03-22 | 2018-10-09 | 徐工集团工程机械股份有限公司 | Hydraulic control system, control method and construction machinery gear box |
| CN109185453A (en) * | 2018-09-27 | 2019-01-11 | 江苏大学 | A kind of hydraulic control system of stepless transmission wet clutch |
| CN114032984A (en) * | 2021-11-10 | 2022-02-11 | 山推工程机械股份有限公司 | Automatic gear shifting transmission system and gear shifting method |
-
2017
- 2017-03-22 CN CN201720278776.9U patent/CN206571853U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108626270A (en) * | 2017-03-22 | 2018-10-09 | 徐工集团工程机械股份有限公司 | Hydraulic control system, control method and construction machinery gear box |
| CN109185453A (en) * | 2018-09-27 | 2019-01-11 | 江苏大学 | A kind of hydraulic control system of stepless transmission wet clutch |
| CN114032984A (en) * | 2021-11-10 | 2022-02-11 | 山推工程机械股份有限公司 | Automatic gear shifting transmission system and gear shifting method |
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