CN209100366U - A kind of hydraulic control system and the tractor comprising it - Google Patents
A kind of hydraulic control system and the tractor comprising it Download PDFInfo
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- CN209100366U CN209100366U CN201920821727.4U CN201920821727U CN209100366U CN 209100366 U CN209100366 U CN 209100366U CN 201920821727 U CN201920821727 U CN 201920821727U CN 209100366 U CN209100366 U CN 209100366U
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Abstract
The utility model relates to a kind of hydraulic control system and comprising its tractor, hydraulic control system has first state and the second state, and reversing arrangement is for switching first state and the second state；First executive device, the second executive device, little progress valve and oil return line are connected with reversing arrangement, and little progress valve is connected by throttling set with oil inlet pipe, are provided with accumulator between little progress valve and throttling set；In the first state, little progress valve is connected with the first executive device, and the second executive device is connected with oil return line；In the second condition, little progress valve is connected with the second executive device, and the first executive device is connected with oil return line.Slow combination, the fast separation function of the first executive device or the second executive device are realized by setting throttling set, little progress valve and accumulator.Hydraulic control system can prevent because quickly combine generate impact, occur work have some setbacks to human body generate it is uncomfortable, have good control precision, system shock can be reduced.
Description
Technical field
The utility model relates to agricultural mechanical fields, and in particular to a kind of hydraulic control system and the tractor comprising it.
Background technique
Dilatory machinery informationization is an important component of agricultural modernization production, is the weight of intelligentize agricultural machine
Support technology is wanted, it is furtherd investigate, meets national development strategy demand.There are two types of mode, machines for traditional tractor shift
Tool shift and power shifting.
For power shifting, high-end type has on a small quantity using electric ratio system, it can be achieved that good control, but cost compared with
Height, and need to guarantee system oil cleanliness, maintenance requires high.Electric proportional control valve controls precision height, to control strategy
It is required that high, it can be achieved that the control variation of the ratio of vehicle forward gear and reverse gear system, price is higher, and contamination resistance is relatively
It is weak, if using independent hydraulic control system, cost is higher.And the oil return circuit using tractor steering system usually may be selected
The miscellaneous function is realized, for the Multipurpose hydraulic oil system that tractor is especially shared with transmission system, hydraulic system cleaning
It is at high cost needed for degree control, and system maintenance requires tightened up, is otherwise easy to appear catching phenomenon, there are more serious hidden danger,
Stability and reliability are relatively low.Most of system using common ordinary tap solenoid valve control, although at low cost,
It cannot achieve and be precisely controlled.Ordinary tap solenoid valve, cost is more cheap, and contamination resistance is better than proportioning valve, does not require very high
Control strategy, be only used for realizing and vehicle forward gear and reverse gear.Ordinary tap solenoid valve control precision is low, not can avoid and is working
It is middle more serious impact occur, it has higher requirements to drive system structure part material, manufacturing process etc..
Summary of the invention
Technical problem to be solved in the utility model is how to realize the accurate control of shift precision.
The technical solution that the utility model solves above-mentioned technical problem is as follows: a kind of hydraulic control system, including first holds
Luggage sets, the second executive device, reversing arrangement, throttling set, accumulator, little progress valve, lubricant passage way, oil inlet pipe and oil return pipe
Road；
The hydraulic control system has first state and the second state, and the reversing arrangement is for switching first shape
State and second state；
First executive device, second executive device and the little progress valve pass through pipeline and the reversing arrangement
It is connected, the oil return line is connected with the reversing arrangement, and the little progress valve is connected by pipeline with the throttling set
It connects, the throttling set is connected with the oil inlet pipe, and the pipeline between the little progress valve and the throttling set passes through the
One bye-pass is connected with the accumulator；
In said first condition, the little progress valve is connected with first executive device, second executive device
It is connected with the oil return line；In said second condition, the little progress valve is connected with second executive device, described
First executive device is connected with the oil return line；
The lubricant passage way is equipped with overflow valve, and the oil inlet of the overflow valve is connected to the oil inlet pipe, described to overflow
The oil outlet of stream valve is connected to first executive device and second executive device respectively.
The beneficial effects of the utility model are: passing through throttling set, little progress valve and accumulator and the first executive device or the
The connection of two executive devices, realizes the slow combination of the first executive device or the second executive device.Switching device switches hydraulic control system
The state of system, the first executive device or the second executive device are connected to oil return line, realize fast separation function.Hydraulic control system
Can prevent because quickly combine generate impact, occur work have some setbacks to human body generate it is uncomfortable, have good control
Precision can reduce system shock.Little progress valve is used in pipeline, can realize oil by adjusting little progress valve according to the needs of use
The flexible modulation of pressure in road, allows vehicle that half-clutch state to be kept to run at a low speed for a long time.The hydraulic oil of high pressure is by overflowing
It flows valve overflow and enters the lubrication of the first executive device and the second executive device realization device.
Based on the above technical solution, the utility model can also do following improvement.
Further, the hydraulic control system also has the third state, and the reversing arrangement is for switching first shape
State, second state and the third state, first executive device and described second executes under the third state
Device is breaking with the oil inlet pipe and is connected with the oil return line.
Further, the oil inlet pipe includes oil pump, and the import of the oil pump is connected by pipeline with fuel tank, the oil
The outlet of pump is connected by pipeline with the throttling set.
Beneficial effect using above-mentioned further scheme is: oil pump by fuel tank hydraulic oil supply the first executive device or
Second executive device.
Further, the oil inlet pipe further includes oil adsorption filter and output filter, the import of the oil pump with it is described
Pipeline between fuel tank is equipped with the oil adsorption filter, sets on the pipeline between the outlet of the oil pump and the throttling set
There is the output filter.
Beneficial effect using above-mentioned further scheme is: oil adsorption filter and output filter filter out in hydraulic oil
Impurity guarantees the cleannes entered in oil circuit, avoids the occurrence of catching phenomenon.
Further, the reversing arrangement is solenoid directional control valve.
Beneficial effect using above-mentioned further scheme is: solenoid directional control valve is at low cost, and contamination resistance is better than proportioning valve.
Further, the accumulator is gravity type accumulator, spring accumul ator or bladder accumulator.
Further, first executive device is forward gear clutch, and second executive device is reverse clutch.
Beneficial effect using above-mentioned further scheme is: the hydraulic control system may be implemented forward gear and reverse gear
Slow combination, the fast separation of clutch are realized in switching.
Further, the throttling set is throttle valve or throttle joint.
A kind of tractor, which is characterized in that including the hydraulic control system.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the hydraulic control system of the utility model embodiment one.
Fig. 2 is the structural schematic diagram of the hydraulic control system of the utility model embodiment two.
Fig. 3 is the pressure history of the hydraulic control system of the utility model.
In attached drawing, parts list represented by the reference numerals are as follows:
10, the first executive device, the 20, second executive device, 30, reversing arrangement, 40, throttling set, 50, accumulator, 51,
First bye-pass, the 52, second bye-pass, 60, little progress valve, 70, overflow valve, 80, oil pump, 90, oil adsorption filter, 100, outlet filter
Clear device, 110, fuel tank.
Specific embodiment
The principles of the present invention and feature are described below in conjunction with attached drawing, example is served only for explaining that this is practical
It is novel, it is not intended to limit the scope of the utility model.
Embodiment one
As shown in figures 1 and 3, the pressure for the hydraulic oil that the first executive device 10 of curve C1 expression is subject in Fig. 3, curve C2
Indicate the pressure for the hydraulic oil that the second executive device 20 is subject to, abscissa is the time.
A kind of hydraulic control system, including the first executive device 10, the second executive device 20, reversing arrangement 30, throttling dress
Set 40, accumulator 50, little progress valve 60, lubricant passage way, oil inlet pipe and oil return line；
The hydraulic control system has first state and the second state, and the reversing arrangement 30 is for switching described first
State and second state；
First executive device 10, second executive device 20 and the little progress valve 60 are changed by pipeline with described
Be connected to device 30, the oil return line is connected with the reversing arrangement 30, the little progress valve 60 by pipeline with it is described
Throttling set 40 is connected, and the throttling set 40 is connected with the oil inlet pipe, and the little progress valve 60 is filled with the throttling
The pipeline set between 40 is connected by the first bye-pass 51 with the accumulator 50；
In said first condition, the little progress valve 60 is connected with first executive device 10, and described second executes
Device 20 is connected with the oil return line；In said second condition, the little progress valve 60 and second executive device 20
It is connected, first executive device 10 is connected with the oil return line；
The lubricant passage way is equipped with overflow valve 70, and the oil inlet of the overflow valve 70 is connected to the oil inlet pipe, institute
The oil outlet for stating overflow valve 70 is connected to first executive device 10 and second executive device 20 respectively.
It is a kind of to manipulate that spool is mobile to adjust hydraulic system pressure by mechanical handling mode specifically, the little progress valve 60
Power size can be realized the flexible modulation of pressure in oil circuit by little progress valve 60 according to the needs of use, allow vehicle for a long time
Keep half-clutch state.
Specifically, being divided into the first cavity and the second cavity, second chamber by accumulator piston in the accumulator 50
It is provided with accumulating mechanism in vivo, the both ends of accumulating mechanism are abutted with the inner wall of accumulator piston and accumulator 50 respectively, and are used for
Store energy, first bye-pass 51 is connected with first cavity, the oil return line by the second bye-pass 52 and
Second cavity of the accumulator 50 is connected, due to having gap between accumulator piston and the side wall of accumulator 50,
Oil return line can be flow to along the second bye-pass 52 by flowing to the intracorporal a small amount of hydraulic oil of the second chamber from the first cavity.
As the further scheme of the present embodiment, the oil inlet pipe includes oil pump 80, and the import of the oil pump 80 passes through
Pipeline is connected with fuel tank 110, and the outlet of the oil pump 80 is connected by pipeline with the throttling set 40.
As the further scheme of the present embodiment, the oil inlet pipe further includes oil adsorption filter 90 and output filter
100, the pipeline between the import and the fuel tank 110 of the oil pump 80 is equipped with the oil adsorption filter 90, the oil pump 80
Outlet the throttling set 40 between pipeline be equipped with the output filter 100.
As the further scheme of the present embodiment, the reversing arrangement 30 is solenoid directional control valve.
Specifically, the reversing arrangement 30 is two four-way electromagnetic reversing valves.Solenoid directional control valve is in the prior art one
Kind Hydraulic system control module, for the direction-control apparatus of pressure oil in hydraulic system, which realizes pressure commutation function,
Realize the switching between the first executive device 10 and the oil circuit of the second executive device 20.The switching mode of the solenoid directional control valve is
The state of the art.As shown in Figure 1, when the connection of the left position of two four-way electromagnetic reversing valves, runner 1. → be 2. connected to simultaneously
And runner 4. → be 3. connected to.When the connection of the right position of two four-way electromagnetic reversing valves, runner 2. → 3. connection and runner 1. →
4. being connected to.
As the further scheme of the present embodiment, the accumulator 50 is gravity type accumulator, spring accumul ator or gas
Bladder type hydropneumatic accumulator.
Specifically, the accumulator 50, is a kind of energy savings device, the accumulator 50 can be by the energy in system
It is changed into compression energy or position energy, Absorbing hydraulic pulsation, and plays the role of adjusting hydraulic system pressure.
As the further scheme of the present embodiment, first executive device 10 is forward gear clutch, and described second holds
Luggage sets 20 as reverse clutch.
As the further scheme of the present embodiment, the throttling set 40 is throttle valve or throttle joint.
Specifically, the throttling set 40, is that one kind is mounted in fluid pressure line, the dress of hydraulic oil throttling function is realized
It sets, the size of throttle orifice can have a direct impact 40 two sides pressure difference of throttling set.The device realizes that pressure oil enters first and executes
When device 10 or the second executive device 20, certain buffer function is played.
Those skilled in the art can be with the model of throttling set 40 and the accumulator 50 described in flexible choice, to meet not
With the requirement of control precision.
The course of work of hydraulic control system described in the present embodiment are as follows:
When oil pump 80 operates, the hydraulic oil in fuel tank 110 enters oil pump 80 by oil adsorption filter 90, then passes through outlet filter
Clear device 100.
As shown in figure 3, a-quadrant indicates the pressure curve under reverse clutch combination and forward gear clutch separation state.
As shown in Figure 1, little progress valve 60 before shift be in closed state, switch reversing arrangement 30, when reversing arrangement 30 left position connect,
I.e. under first state, hydraulic oil arrives little progress valve 60 through throttling set 40, and the spool of little progress valve 60 is manipulated by mechanical handling mode
It is mobile, the opening of little progress valve 60 is gradually opened, pipeline inner pressure increases, the runner of reversing arrangement 30 1. → be 2. connected to, push
Forward gear clutch slowly combines.Under throttling set 40 acts on, hydraulic fluid flow rate is controlled, according to bernoulli principle, before
Pressure into the hydraulic oil of gear clutch will not increase to maximum value but be gradually increased moment.Pressure of the accumulator 50 in setting
Pipeline inner pressure is adjusted in range, is increased incrementally rather than pressure and is increased sharply, under the effect of accumulator 50, forward gear clutch
Device pressure incrementally increases, and forward gear clutch is pushed slowly to combine.The above process is reflected in the curve C1 of region B in Fig. 3, preceding
One small end steady pressure constant interval of section, pressure step up, and forward gear clutch is completely combined to the end, reduces change very well
The shock problem of gear has good ride comfort.Remaining is throttled the hydraulic oil of the blocking of device 40 by overflow valve 70 to lubrication
Oil circuit lubricates forward gear clutch and reverse clutch.In another oil circuit, hydraulic oil by reversing arrangement 30 runner 4. →
3. being returned directly to fuel tank 110 by oil return line, the quick relief of pressure in reverse clutch is realized, so that reverse clutch
Quick separating.It is reflected in the curve C2 fast step decline of region B in Fig. 3.Region C indicates that solenoid directional control valve persistently obtains in Fig. 3
Under electrification, forward gear clutch is completely combined, and shift is completed.
As shown in Figure 1, little progress valve 60 is in closed state before shift, switch reversing arrangement 30, when reversing arrangement 30
Right position is connected, i.e. under the second state, hydraulic oil arrives little progress valve 60 through throttling set 40, manipulates little progress valve by mechanical handling mode
60 spool is mobile, and the opening of little progress valve 60 is gradually opened, and pipeline inner pressure increases, the runner of reversing arrangement 30 1. → 4. connect
It is logical, push reverse clutch slowly to combine.Under throttling set 40 acts on, hydraulic fluid flow rate is controlled, according to bernoulli principle, into
The pressure for entering the hydraulic oil of reverse clutch is gradually increased, and under the effect of accumulator 50, reverse clutch pressure is incrementally increased, and pushes away
Dynamic reverse clutch slowly combines.The above process is reflected in the curve C2 of region D in Fig. 3, and one small end steady pressure of leading portion becomes
Change section, pressure steps up, and reverse clutch is completely combined to the end, reduces the shock problem of shift very well, has good
Good ride comfort.Remaining is throttled the hydraulic oil of the blocking of device 40 by overflow valve 70 to lubricant passage way, to forward gear clutch
It is lubricated with reverse clutch.In another oil circuit, hydraulic oil by reversing arrangement 30 runner 2. → 3., directly returned by oil return line
To fuel tank 110, the quick relief of pressure in forward gear clutch is realized, so that forward gear clutch quick separating.It is reflected in Fig. 3
The forward gear pressure curve fast step of middle region D declines.
A kind of tractor, including the hydraulic control system.
Embodiment two
As shown in Figures 2 and 3, the pressure for the hydraulic oil that the first executive device 10 of curve C1 expression is subject in Fig. 3, curve C2
Indicate the pressure for the hydraulic oil that the second executive device 20 is subject to.
A kind of hydraulic control system, including the first executive device 10, the second executive device 20, reversing arrangement 30, throttling dress
Set 40, accumulator 50, little progress valve 60, lubricant passage way, oil inlet pipe and oil return line；
The hydraulic control system has first state and the second state, and the reversing arrangement 30 is for switching described first
State and second state；
First executive device 10, second executive device 20 and the little progress valve 60 are changed by pipeline with described
Be connected to device 30, the oil return line is connected with the reversing arrangement 30, the little progress valve 60 by pipeline with it is described
Throttling set 40 is connected, and the throttling set 40 is connected with the oil inlet pipe, and the little progress valve 60 is filled with the throttling
The pipeline set between 40 is connected by the first bye-pass 51 with the accumulator 50；
In said first condition, the little progress valve 60 is connected with first executive device 10, and described second executes
Device 20 is connected with the oil return line；In said second condition, the little progress valve 60 and second executive device 20
It is connected, first executive device 10 is connected with the oil return line；
The lubricant passage way is equipped with overflow valve 70, and the oil inlet of the overflow valve 70 is connected to the oil inlet pipe, institute
The oil outlet for stating overflow valve 70 is connected to first executive device 10 and second executive device 20 respectively.
It is a kind of to manipulate that spool is mobile to adjust hydraulic system pressure by mechanical handling mode specifically, the little progress valve 60
Power size can realize the flexible modulation of pressure in oil circuit by little progress valve 60 according to the needs of use.
Specifically, being divided into the first cavity and the second cavity, second chamber by accumulator piston in the accumulator 50
It is provided with accumulating mechanism in vivo, the both ends of accumulating mechanism are abutted with the inner wall of accumulator piston and accumulator 50 respectively, and are used for
Store energy, first bye-pass 51 is connected with first cavity, the oil return line by the second bye-pass 52 and
Second cavity of the accumulator 50 is connected, due to having gap between accumulator piston and the side wall of accumulator 50,
Oil return line can be flow to along the second bye-pass 52 by flowing to the intracorporal a small amount of hydraulic oil of the second chamber from the first cavity.
As the further scheme of the present embodiment, the hydraulic control system also has the third state, the reversing arrangement
30 for switching the first state, second state and the third state, and described first holds under the third state
Luggage set 10 and second executive device 20 with oil inlet pipe open circuit and be connected with the oil return line.
As the further scheme of the present embodiment, the oil inlet pipe includes oil pump 80, and the import of the oil pump 80 passes through
Pipeline is connected with fuel tank 110, and the outlet of the oil pump 80 is connected by pipeline with the throttling set 40.
As the further scheme of the present embodiment, the oil inlet pipe further includes oil adsorption filter 90 and output filter
100, the pipeline between the import and the fuel tank 110 of the oil pump 80 is equipped with the oil adsorption filter 90, the oil pump 80
Outlet the throttling set 40 between pipeline be equipped with the output filter 100.
As the further scheme of the present embodiment, the reversing arrangement 30 is solenoid directional control valve.
Specifically, the reversing arrangement 30 can apply two four-way electromagnetic reversing valves described in example one to be strictly according to the facts, it is preferred that
The reversing arrangement 30 is three-position four-way electromagnetic directional valve.Solenoid directional control valve is a kind of Hydraulic system control module, for hydraulic
The direction-control apparatus of pressure oil in system, the module realize pressure commutation function, realize that the first executive device 10 and second is held
Luggage sets the switching between 20 oil circuit.The switching mode of the solenoid directional control valve is the state of the art.Such as Fig. 2 institute
Show, when the connection of the left position of three-position four-way electromagnetic directional valve, 1. → 2. connection and runner 4. → 3. runner is connected to.When three four
When the right position connection of electric change valve, 2. → 3. connection and runner 1. → 4. runner is connected to.When 3-position 4-way electromagnetic switch
When the middle position connection of valve, 2. → 3. connection and runner 4. → 3. runner is connected to.
As the further scheme of the present embodiment, the accumulator 50 is gravity type accumulator, spring accumul ator or gas
Bladder type hydropneumatic accumulator.
Specifically, the accumulator 50, is a kind of energy savings device, the accumulator 50 can be by the energy in system
It is changed into compression energy or position energy, Absorbing hydraulic pulsation, and plays the role of adjusting hydraulic system pressure.
As the further scheme of the present embodiment, first executive device 10 is forward gear clutch, and described second holds
Luggage sets 20 as reverse clutch.
As the further scheme of the present embodiment, the throttling set 40 is throttle valve or throttle joint.
Specifically, the throttling set 40, is that one kind is mounted in fluid pressure line, the dress of hydraulic oil throttling function is realized
It sets, the size of throttle orifice can have a direct impact 40 two sides pressure difference of throttling set.The device realizes that pressure oil enters first and executes
When device 10 or the second executive device 20, certain buffer function is played.
Those skilled in the art can be with the model of throttling set 40 and the accumulator 50 described in flexible choice, to meet not
With the requirement of control precision.
The course of work of hydraulic control system described in the present embodiment are as follows:
When oil pump 80 operates, the hydraulic oil in fuel tank 110 enters oil pump 80 by oil adsorption filter 90, then passes through outlet filter
Clear device 100.
As shown in figure 3, a-quadrant indicates the pressure curve under reverse clutch combination and forward gear clutch separation state.
As shown in Fig. 2, little progress valve 60 before shift be in closed state, switch reversing arrangement 30, when reversing arrangement 30 left position connect,
I.e. under first state, hydraulic oil arrives little progress valve 60 through throttling set 40, and the spool of little progress valve 60 is manipulated by mechanical handling mode
It is mobile, the opening of little progress valve 60 is gradually opened, pipeline inner pressure increases, the runner of reversing arrangement 30 1. → be 2. connected to, push
Forward gear clutch slowly combines.Under throttling set 40 acts on, hydraulic fluid flow rate is controlled, according to bernoulli principle, before
Pressure into the hydraulic oil of gear clutch will not increase to maximum value but be gradually increased moment.Pressure of the accumulator 50 in setting
Pipeline inner pressure is adjusted in range, is increased incrementally rather than pressure and is increased sharply, under the effect of accumulator 50, forward gear clutch
Device pressure incrementally increases, and forward gear clutch is pushed slowly to combine.The above process is reflected in the curve C1 of region B in Fig. 3, preceding
One small end steady pressure constant interval of section, pressure step up, and forward gear clutch is completely combined to the end, reduces change very well
The shock problem of gear has good ride comfort.Remaining is throttled the hydraulic oil of the blocking of device 40 by overflow valve 70 to lubrication
Oil circuit lubricates forward gear clutch and reverse clutch.In another oil circuit, hydraulic oil by reversing arrangement 30 runner 4. →
3. being returned directly to fuel tank 110 by oil return line, the quick relief of pressure in reverse clutch is realized, so that reverse clutch
Quick separating.It is reflected in the curve C2 fast step decline of region B in Fig. 3.Region C indicates that solenoid directional control valve persistently obtains in Fig. 3
Under electrification, forward gear clutch is completely combined, and shift is completed.
As shown in Fig. 2, little progress valve 60 is in closed state before shift, switch reversing arrangement 30, when reversing arrangement 30
Right position is connected, i.e. under the second state, hydraulic oil arrives little progress valve 60 through throttling set 40, manipulates little progress valve by mechanical handling mode
60 spool is mobile, and the opening of little progress valve 60 is gradually opened, and pipeline inner pressure increases, the runner of reversing arrangement 30 1. → 4. connect
It is logical, push reverse clutch slowly to combine, while 50 absorption pressure energy of accumulator.Under throttling set 40 acts on, hydraulic fluid flow rate
It is controlled, according to bernoulli principle, the pressure into the hydraulic oil of reverse clutch is gradually increased, under the effect of accumulator 50,
Reverse clutch pressure incrementally increases, and reverse clutch is pushed slowly to combine.The above process is reflected in the song of region D in Fig. 3
Line C2, one small end steady pressure constant interval of leading portion, pressure step up, and reverse clutch is completely combined to the end, drop very well
The shock problem of low shift, has good ride comfort.Remaining is throttled the hydraulic oil of the blocking of device 40 by overflow valve 70
To lubricant passage way, forward gear clutch and reverse clutch are lubricated.In another oil circuit, hydraulic oil by reversing arrangement 30 runner
2. → 3., fuel tank 110 is returned directly to by oil return line, realizes the quick relief of pressure in forward gear clutch, so that advancing
Keep off clutch quick separating.It is reflected in the forward gear pressure curve fast step decline of region D in Fig. 3.
When solenoid directional control valve power loss, i.e., when hydraulic control system is in the third state, hydraulic oil is through overflow valve to lubrication management
Road.
A kind of tractor, including the hydraulic control system.
In the description of the present invention, it should be noted that term " on ", "lower", "front", "rear", "left", "right",
The orientation or positional relationship of the instructions such as "inner", "outside" is to be based on the orientation or positional relationship shown in the drawings, and is merely for convenience of retouching
State the utility model and simplify description, rather than the device or element of indication or suggestion meaning must have a particular orientation, with
Specific orientation construction and operation, therefore should not be understood as limiting the present invention.In addition, term " first ", " second "
It is used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " is pacified
Dress ", " connected ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integrally
Connection；It can be mechanical connection, be also possible to be electrically connected；Can be directly connected, can also indirectly connected through an intermediary,
It can be the connection inside two elements.For the ordinary skill in the art, above-mentioned art can be understood with concrete condition
The concrete meaning of language in the present invention.In addition, in the description of the present invention, unless otherwise indicated, " multiples' " contains
Justice is two or more.
The above is only the preferred embodiment of the present invention, is not intended to limit the utility model, all practical at this
Within novel spirit and principle, any modification, equivalent replacement, improvement and so on should be included in the guarantor of the utility model
Within the scope of shield.
Claims (9)
1. a kind of hydraulic control system, which is characterized in that including the first executive device (10), the second executive device (20), commutation
Device (30), throttling set (40), accumulator (50), little progress valve (60), lubricant passage way, oil inlet pipe and oil return line；
The hydraulic control system has first state and the second state, and the reversing arrangement (30) is for switching first shape
State and second state；
First executive device (10), second executive device (20) and the little progress valve (60) by pipeline with it is described
Reversing arrangement (30) is connected, and the oil return line is connected with the reversing arrangement (30), and the little progress valve (60) passes through pipe
Road is connected with the throttling set (40), and the throttling set (40) is connected with the oil inlet pipe, the little progress valve
(60) pipeline between the throttling set (40) is connected by the first bye-pass (51) with the accumulator (50)；
In said first condition, the little progress valve (60) is connected with first executive device (10), and described second executes
Device (20) is connected with the oil return line；In said second condition, the little progress valve (60) and described second executes dress
It sets (20) to be connected, first executive device (10) is connected with the oil return line；
The lubricant passage way is equipped with overflow valve (70), and the oil inlet of the overflow valve (70) is connected to the oil inlet pipe, institute
The oil outlet for stating overflow valve (70) is connected to first executive device (10) and second executive device (20) respectively.
2. a kind of hydraulic control system according to claim 1, which is characterized in that the hydraulic control system also has third
State, the reversing arrangement (30) is for switching the first state, second state and the third state, described the
Under three condition first executive device (10) and second executive device (20) with the oil inlet pipe open circuit and with
The oil return line is connected.
3. a kind of hydraulic control system according to claim 1 or claim 2, which is characterized in that the oil inlet pipe includes oil pump
(80), the import of the oil pump (80) is connected by pipeline with fuel tank (110), the outlet of the oil pump (80) by pipeline and
The throttling set (40) is connected.
4. a kind of hydraulic control system according to claim 3, which is characterized in that the oil inlet pipe further includes oil suction filtering
Device (90) and output filter (100), the pipeline between the import and the fuel tank (110) of the oil pump (80) are equipped with described
Oil adsorption filter (90), the pipeline between the outlet and the throttling set (40) of the oil pump (80) are filtered equipped with the outlet
Clear device (100).
5. any one of -2,4 a kind of hydraulic control system according to claim 1, which is characterized in that the reversing arrangement (30)
For solenoid directional control valve.
6. any one of -2,4 a kind of hydraulic control system according to claim 1, which is characterized in that the accumulator (50) is
Gravity type accumulator, spring accumul ator or bladder accumulator.
7. any one of -2,4 a kind of hydraulic control system according to claim 1, which is characterized in that first executive device
It (10) is forward gear clutch, second executive device (20) is reverse clutch.
8. any one of -2,4 a kind of hydraulic control system according to claim 1, which is characterized in that the throttling set (40)
For throttle valve or throttle joint.
9. a kind of tractor, which is characterized in that including the described in any item hydraulic control systems of claim 1-8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920821727.4U CN209100366U (en) | 2019-06-03 | 2019-06-03 | A kind of hydraulic control system and the tractor comprising it |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920821727.4U CN209100366U (en) | 2019-06-03 | 2019-06-03 | A kind of hydraulic control system and the tractor comprising it |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209100366U true CN209100366U (en) | 2019-07-12 |
Family
ID=67164122
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920821727.4U Active CN209100366U (en) | 2019-06-03 | 2019-06-03 | A kind of hydraulic control system and the tractor comprising it |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209100366U (en) |
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2019
- 2019-06-03 CN CN201920821727.4U patent/CN209100366U/en active Active
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Address after: 261206 No. 192 South Beihai Road, Fangzi District, Shandong, Weifang Patentee after: Weichai Lovol Intelligent Agricultural Technology Co.,Ltd. Address before: 261206 No. 192 South Beihai Road, Fangzi District, Shandong, Weifang Patentee before: Weichai leiwo Heavy Industry Co.,Ltd. |