CN110056545A - A kind of tractor hydraulic machine stepless transmission changes section and the hydraulic system of cooling and lubricating - Google Patents
A kind of tractor hydraulic machine stepless transmission changes section and the hydraulic system of cooling and lubricating Download PDFInfo
- Publication number
- CN110056545A CN110056545A CN201910066727.2A CN201910066727A CN110056545A CN 110056545 A CN110056545 A CN 110056545A CN 201910066727 A CN201910066727 A CN 201910066727A CN 110056545 A CN110056545 A CN 110056545A
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- Prior art keywords
- oil
- oil circuit
- cooling
- section
- hydraulic
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
- F15B1/02—Installations or systems with accumulators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/04—Special measures taken in connection with the properties of the fluid
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/04—Special measures taken in connection with the properties of the fluid
- F15B21/041—Removal or measurement of solid or liquid contamination, e.g. filtering
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Control Of Transmission Device (AREA)
- General Details Of Gearings (AREA)
Abstract
A kind of tractor hydraulic mechanical stepless transmission changes section and the hydraulic system of cooling and lubricating, is related to hydraulic transmission technology field.Hydraulic system includes that oil-feeding control system, wet clutch change section control system and cooling and lubricating control system, oil-feeding control system includes two hydraulic oil sources of the first oil pump and accumulator, it includes seven wet clutch being mutually in parallel control oil circuits that wet clutch, which changes section control system, cooling and lubricating control system includes several cooling and lubricating oil circuits parallel with one another, and that realizes hydraulic mechanical stepless gearbox is rationally fully cooled lubrication.Hydraulic system applications are in heavy intelligent tractor hydraulic mechanical stepless transmission, realize that the hydraulic mechanical stepless gearbox of four sections changes a section control, and the control for changing section pressure is realized by changing section electric proportional valve, keep hydraulic system more accurate to shift process control, more excellent cooling and lubricating is realized simultaneously, extends speed changer service life.
Description
Technical field
The invention belongs to hydraulic transmission technology fields, and in particular to a kind of tractor hydraulic machine stepless transmission changes Duan Yuleng
But hydraulic system of lubrication.
Background technique
Heavy tractor is mainly used for farm work, and the power for needing to transmit is big, and speed variation is wide, but operating environment
Badly, the continuous variation of load or running resistance is adapted to this requires engine and speed changer change revolving speed or torque in real time
To guarantee dynamic property, fuel economy and the driver comfort of heavy tractor.With China's tractor stepless transmission technology
Horizontal development, people constantly propose new requirements at the higher level to the performance of speed changer, while changing section and cooling profit to speed changer
Sliding hydraulic system is put forward higher requirements.In general, change section quality quality depend on two aspect, first is that the selection of clutch and
Its design feature, another is then to change a section hydraulic system, and the latter's influence is bigger.Change quality, the cooling and lubricating of section hydraulic system
Whether hydraulic system rationally largely decides the transmission efficiency and service life of entire speed changer.Change mentioning for section quality
The working efficiency that can be improved tractor with good cooling and lubricating is risen, so that driving is more comfortable, is dragged to China's heavy type is improved
Machine drawing working performance suffers from Great significance with the promotion field technological innovation.
Just start to walk currently, domestic to the research of tractor hydraulic mechanical stepless transmission, lack to hydraulic machinery without
The important executing agency's hydraulic system of grade speed changer rationally completely designs, to realize that the multi-segment of speed changer changes section control and fills
The cooling and lubricating divided.
Summary of the invention
It is stepless the technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a kind of tractor hydraulic machine
Speed changer changes section and cooling hydraulic system, and the control of section pressure is changed by changing section electric proportional valve realization, makes hydraulic system to shift
The control of process is more accurate, and optimizes cooling and lubricating system, extends the service life of speed changer.
It includes oil-feeding control system that the present invention, which provides a kind of tractor hydraulic machine stepless transmission and changes section and cooling hydraulic system,
System, wet clutch change section control system and cooling and lubricating control system；Oil-feeding control system includes fuel tank (1), the first oil pump
(2), accumulator (4), filter (5), the first oil circuit (16) and the second oil circuit (17), fuel tank (1) are connected with oil pump (2), oil pump
(2) it is connected by the first oil circuit with accumulator (4), accumulator (4) connects filter (5) through the second oil circuit (17)；Wet type clutch
It includes seven wet clutch control oil circuits and third oil circuit (18) parallel with one another, wet clutch control that device, which changes section control system,
Liquefaction road includes the hydraulic shift cylinders being connected in series and changing section electricity than valve, respectively change the input terminal of section electric proportional valve with third oil circuit
(18) it is connected；Cooling and lubricating control system includes the second oil pump (3), the 4th oil circuit (19), cooler (13), the 5th oil circuit
(20), oil pressure cntrol valve group and several cooling and lubricating oil circuits parallel with one another, one end of the second oil pump (3) are connected with fuel tank (1),
Its other end connects the 4th oil circuit, and cooler (13) is set between the 4th oil circuit (19) and the 5th oil circuit (20), each cooling profit
The 5th oil circuit (20) of lubricating oil Lu Junyu is connected.
As further technical solution of the present invention, wet clutch change in section control system hydraulic shift cylinders be wet type from
Clutch piston cylinder, the friction plate drained the oil with the oil-filled friction plate of chamber and steel disc engagement state and chamber separate shape with steel disc
State.
Further, hydraulic shift cylinders and change section electricity than between valve be equipped with damping hole, change section electricity than between valve and damping hole
Pressure sensor is installed.
Further, pressure sensor, filter (5) and accumulator are installed between the first oil pump (2) and filter (5)
(4) mounting temperature sensor between.
Further, the oil pressure cntrol valve group of cooling and lubricating control system includes the first check valve (14) and second one-way valve
(15), the first check valve (14) is set between the 4th oil circuit (19) and the 5th oil circuit (20), when the 4th oil circuit (19) oil pressure is big
When the back pressure value of the first check valve (14), then the oil liquid in the 4th oil circuit (19) allows to flow into the by the first check valve (14)
Five oil circuits (20), second one-way valve (15) are set on the 5th oil circuit (20), when the 5th oil circuit (20) is greater than second one-way valve
(15) when back pressure value, then the oil liquid in the 5th oil circuit (20) allows to flow into fuel tank (1) by second one-way valve (15).
Further, cooling and lubricating oil circuit parallel with one another includes distribution of lubrication oil road L1, PTO half front axle component lubrication road
The later half shaft member lubrication road L3 of L2, PTO and brake lubricate road L4.
Further, pressure sensor is installed on the 5th oil circuit (20).
This hydraulic system applications realizes the hydraulic of four sections in heavy intelligent tractor hydraulic mechanical stepless transmission
Mechanical stepless transmission changes a section control, and realizes the control for changing section pressure by changing section electric proportional valve, makes hydraulic system pair
Shift process control is more accurate, meanwhile, system optimization cooling and lubricating extends speed changer service life.
Detailed description of the invention
Fig. 1 is tractor hydraulic mechanical stepless transmission transmission principle figure of the invention；
Fig. 2 is system principle schematic diagram of the invention.
In figure: 1. fuel tanks, 2. oil supply system oil pumps, 3. cooling and lubricating system oil pumps, 4. accumulators, 5. filters, 6,7,
8,9,10,11,12. change a section electric proportional valve, 13. coolers, 14. first check valves, 15. second one-way valves, 16. first oil circuits,
17. the second oil circuit, 18. third oil circuits, 19 the 4th oil circuits, 20. the 5th oil circuits, 21 the 6th oil circuits.
Specific embodiment
Fig. 1 and Fig. 2 are please referred to, the present embodiment provides a kind of tractor hydraulic machine stepless transmissions to change section and cooling hydraulic pressure system
System changes section control system and cooling and lubricating control system including oil-feeding control system, wet clutch；Oil-feeding control system includes
Fuel tank 1, the first oil pump 2, accumulator 4, filter 5, the first oil circuit 16 and the second oil circuit 17, fuel tank 1 are connected with oil pump 2, oil pump 2
It is connected by the first oil circuit 16 with accumulator 4, accumulator 4 connects filter 5 through the second oil circuit 17；Fuel tank 1 mentions for hydraulic drive
For dynamic medium, hydraulic oil is supplied to the first oil pump 2 and is pumped out, accumulator 4 can be mended as auxiliary oil sources and emergency power source
It fills leakage and keeps constant pressure, absorb hydraulic shock, the two hydraulic power sources provide enough power sources for hydraulic system.5 refined filtration of fine filter
More clean hydraulic oil is supplied to third oil circuit 18 out, to meet the requirement for changing section electric proportional valve.
It includes seven wet clutch control oil circuits and third oil circuit parallel with one another that wet clutch, which changes section control system,
18, wet clutch control oil circuit includes the hydraulic shift cylinders being connected in series and changes section electricity than valve, respectively changes the input of section electric proportional valve
End is connected with third oil circuit 18；Changing a section electric proportional valve is controlled by proportion electro-magnet, and the pressure of output and the electricity of input are made
It flows directly proportional, it is possible to which the method by changing input electrical signal carries out accurate continuous control to pressure.
Cooling and lubricating control system includes the second oil pump 3, the 4th oil circuit 19, cooler 13, the 5th oil circuit 20, oil pressure cntrol
Valve group and several cooling and lubricating oil circuits parallel with one another, one end of the second oil pump 3 are connected with fuel tank 1, other end connection the 4th
Oil circuit 19, cooler 13 are set between the 4th oil circuit 19 and the 5th oil circuit 20, each cooling and lubricating oil circuit with the 5th oil circuit 20
It is connected.
It is wet clutch piston cylinder that wet clutch, which changes hydraulic shift cylinders in section control system, oil-filled with chamber
The friction plate and steel disc discrete state that friction plate and steel disc engagement state and chamber are drained the oil.
Hydraulic shift cylinders and change section electricity than between valve be equipped with damping hole, change section electricity than there are detections between valve and damping hole
Hole, mountable pressure sensor, real-time detection working condition down-off, the situation of change of pressure.
Pressure sensor is installed between the first oil pump 2 and filter 5, temperature sensing is installed between filter 5 and accumulator 4
Device.
The oil pressure cntrol valve group of cooling and lubricating control system includes the first check valve 14 and second one-way valve 15, and first is unidirectional
Valve 14 is set between the 4th oil circuit 19 and the 5th oil circuit 20, when 19 oil pressure of the 4th oil circuit is greater than the back pressure value of the first check valve 14
When, then the oil liquid in the 4th oil circuit 19 allows to flow into the 5th oil circuit 20 by the first check valve 14, and second one-way valve 15 is set to
On 5th oil circuit 20, when the 5th oil circuit 20 is greater than the back pressure value of second one-way valve 15, then the oil liquid in the 5th oil circuit 20 allows
Fuel tank 1 is flowed by second one-way valve 15.Pressure sensor is installed, pressure under real-time detection working condition on the 5th oil circuit 20
Situation of change.
After cooling and lubricating oil circuit parallel with one another includes distribution of lubrication oil road L1, PTO half front axle component lubrication road L2, PTO
Semiaxis component lubrication road L3 and brake lubricate road L4；Lubrication oil circuit L1 is clutch of the tractor in addition to changing section clutch
Device provide distribution oil liquid, lubrication oil circuit L2 be PTO first half shaft clutch C1, C2, C3, C4, bearing, gear, spline and its
Its high speed rotation part provide lubrication oil liquid, lubrication oil circuit L3 be PTO after axle shaft clutch CV, CR, bearing, gear,
Spline and other high speed rotation parts provide lubrication oil liquid, and lubrication oil circuit L4 provides lubrication oil liquid for brake B.
All clutch drainings are flowed into fuel tank by the 6th oil circuit 21 in the system.
The operating process of this system is as follows:
When drive shift F1 works, CV clutch, C1 clutch and B brake need fuel feeding to engage.It is needed at this time to changing section electricity ratio
Example valve 6 changes section electric proportional valve 8 and changes the energization of section electric proportional valve 12.After corresponding electric proportional valve is electrified, CV clutch, C1
Clutch is connected with the oil circuit of B brake, respectively enters oil-filled state, so that speed changer hangs up F1 gear.When drive shift F1 liter
When shelves are to F2, C1 clutch draining, C2 clutch is oil-filled.CV clutch and B brake continue to keep oil-filled state.It only needs at this time
Change the power-up state of transforming section electric proportional valve 9, adjusts the size of damping hole in advance in an experiment to meet and change section quality
It is required that.After corresponding electric proportional valve powers on, CV clutch, C2 clutch and B brake are respectively in oil-filled state, so that speed change
Device hangs up F2 gear.When drive shift F2 upshift is to F3, B brake draining, C3 clutch is oil-filled.CV clutch and C2 clutch
Continue to keep oil-filled state.Only need to change the power-up state of transforming section electric proportional valve 10 at this time.When corresponding electric proportional valve powers on
Afterwards, CV clutch, C2 clutch and C3 clutch are respectively in oil-filled state, so that speed changer hangs up F3 gear.As drive shift F3
When upshifing to F4, C3 clutch draining, C4 clutch is oil-filled.CV clutch and C2 clutch continue to keep oil-filled state.At this time
Only need to change the power-up state of 3-position 4-way electric proportional valve 11.After corresponding solenoid valve powers on, CV clutch, C2 clutch
With C4 clutch respectively in oil-filled state, so that speed changer hangs up F4 gear.
When drive shift F4 downshift is to F3, C4 clutch draining, C3 clutch is oil-filled.CV clutch and C2 clutch continue
Keep oil-filled state.Only need to change the power-up state of 3-position 4-way electric proportional valve 10 at this time.After corresponding solenoid valve powers on,
CV clutch, C2 clutch and C3 clutch are respectively in oil-filled state, so that speed changer hangs up F3 gear.When drive shift F3 downshifts
When to F2, C3 clutch draining, B clutch is oil-filled.CV clutch and C2 clutch continue to keep oil-filled state.It only needs at this time
Change the power-up state of electric proportional valve 12.After corresponding solenoid valve powers on, CV clutch, C2 clutch and B clutch difference
In oil-filled state, so that speed changer hangs up F2 gear.When drive shift F2 downshift is to F1, C2 clutch draining, C1 clutch fills
Oil.CV clutch and B brake continue to keep oil-filled state.Only need to change the power-up state of electric proportional valve 8 at this time.When corresponding
Electric proportional valve power on after, CV clutch, C2 clutch and B brake are respectively in oil-filled state, so that speed changer hangs up F1 grades
Position.As when parking, electric proportional valve 6, electric proportional valve 8 and electric proportional valve 12 power off, CV clutch, C1 clutch and B brake point
Not carry out draining so that speed changer stop transfer motion power.
When reverse gear R1 works, CR clutch, C1 clutch and B brake need fuel feeding to engage.It is needed at this time to electric ratio
The 12 of valve 7, electric proportional valve 8 and electric proportional valve are powered, after corresponding solenoid valve powers on, CR clutch, C1 clutch and B braking
The oil circuit of device is connected, and oil-filled state is respectively enterd, so that speed changer hangs up R1 gear.When reverse gear R1 upshift is to R2, C1 clutch
Device draining, C2 clutch are oil-filled.CR clutch and B brake continue to keep oil-filled state.It only needs to change electric proportional valve 9 at this time
Power-up state, adjust damping hole size in advance in an experiment to meet the requirement for changing section quality.When on corresponding solenoid valve
After electricity, CR clutch, C2 clutch and B brake are respectively in oil-filled state, so that speed changer hangs up R2 gear.When reverse gear R2 liter
When shelves are to R3, B clutch draining, C3 clutch is oil-filled.CR clutch and C2 clutch continue to keep oil-filled state.It only needs at this time
Change the power-up state of electric proportional valve 10.After corresponding solenoid valve powers on, CR clutch, C2 clutch and C3 clutch point
Not in oil-filled state, so that speed changer hangs up R3 gear.When reverse gear R3 upshift is to R4, C3 clutch draining, C4 clutch fills
Oil.CR clutch and C2 clutch continue to keep oil-filled state.Only need to change the power-up state of electric proportional valve 11 at this time.Work as phase
After the solenoid valve answered powers on, CR clutch, C2 clutch and C4 clutch are respectively in oil-filled state, so that speed changer hangs up R4 grades
Position.
In the present embodiment when reverse gear R4 downshifts to R3, C4 clutch draining, C3 clutch is oil-filled.CR clutch and C2
Clutch continues to keep oil-filled state.Only need to change the power-up state of electric proportional valve 10 at this time.When corresponding solenoid valve powers on
Afterwards, CR clutch, C2 clutch and C3 clutch are respectively in oil-filled state, so that speed changer hangs up R3 gear.When reverse gear R3 drops
When shelves are to R2, C3 clutch draining, B clutch is oil-filled.CR clutch and C2 clutch continue to keep oil-filled state.It only needs at this time
Change the power-up state of electric proportional valve 12.After corresponding solenoid valve powers on, CR clutch, C2 clutch and B clutch point
Not in oil-filled state, so that speed changer hangs up R2 gear.When reverse gear R2 downshift is to R1, C2 clutch draining, C1 clutch fills
Oil.CR clutch and B brake continue to keep oil-filled state.The power-up state for only needing to change electric proportional valve 8 at this time, when corresponding
Solenoid valve power on after, CR clutch, C1 clutch and B brake are respectively in oil-filled state, so that speed changer hangs up R1 gear.
As when parking, electric proportional valve 7, electric proportional valve 8 and electric proportional valve 12 power off, CR clutch, C1 clutch and B brake respectively into
Row draining, so that speed changer stops transfer motion power.
The basic principles, main features and advantages of the invention have been shown and described above.Those skilled in the art should
Understand, the present invention do not limited by above-mentioned specific embodiment, the description in above-mentioned specific embodiment and specification be intended merely into
One step illustrates the principle of the present invention, and under the premise of not departing from spirit of that invention range, the present invention also has various change and changes
Into these changes and improvements all fall within the protetion scope of the claimed invention.The scope of protection of present invention is by claim
Book and its equivalent thereof.
Claims (7)
1. a kind of tractor hydraulic machine stepless transmission changes section and cooling hydraulic system, which is characterized in that including oil-feeding control system
System, wet clutch change section control system and cooling and lubricating control system；The oil-feeding control system includes fuel tank (1), first
Oil pump (2), accumulator (4), filter (5), the first oil circuit (16) and the second oil circuit (17), the fuel tank (1) and oil pump (2) phase
Even, the oil pump (2) is connected by the first oil circuit with the accumulator (4), and the accumulator (4) connects through the second oil circuit (17)
The filter (5)；It includes seven wet clutch control oil circuits parallel with one another that the wet clutch, which changes section control system,
With third oil circuit (18), the wet clutch control oil circuit includes the hydraulic shift cylinders being connected in series and changes section electricity than valve, each institute
It states and changes the input terminal of section electric proportional valve and be connected with the third oil circuit (18)；The cooling and lubricating control system includes the second oil
Pump (3), the 4th oil circuit (19), cooler (13), the 5th oil circuit (20), oil pressure cntrol valve group and several cooling profits parallel with one another
The one end on lubricating oil road, second oil pump (3) is connected with fuel tank (1), and the other end connects the 4th oil circuit (19), described cold
But device (13) is set between the 4th oil circuit (19) and the 5th oil circuit (20), and each cooling and lubricating oil circuit is and institute
The 5th oil circuit (20) is stated to be connected.
2. a kind of tractor hydraulic machine stepless transmission according to claim 1 changes section and cooling hydraulic system, feature
It is, it is wet clutch piston cylinder that the wet clutch, which changes hydraulic shift cylinders described in section control system, with chamber
The friction plate and steel disc discrete state that oil-filled friction plate and steel disc engagement state and chamber is drained the oil.
3. a kind of tractor hydraulic machine stepless transmission according to claim 1 changes section and cooling hydraulic system, feature
It is, the hydraulic shift cylinders and the section electricity that changes are than being equipped with damping hole between valve, the section electricity that changes is than between valve and damping hole
Pressure sensor is installed.
4. a kind of tractor hydraulic machine stepless transmission according to claim 1 changes section and cooling hydraulic system, feature
It is, pressure sensor, the filter (5) and the accumulation of energy is installed between first oil pump (2) and the filter (5)
Mounting temperature sensor between device (4).
5. a kind of tractor hydraulic machine stepless transmission according to claim 1 changes section and cooling hydraulic system, feature
It is, the oil pressure cntrol valve group of the cooling and lubricating control system includes the first check valve (14) and second one-way valve
(15), first check valve (14) is set between the 4th oil circuit (19) and the 5th oil circuit (20), when described
When four oil circuits (19) oil pressure is greater than the back pressure value of first check valve (14), then the oil liquid in the 4th oil circuit (19) allows
The 5th oil circuit (20) is flowed by the first check valve (14), the second one-way valve (15) is set to the 5th oil circuit
On, when the 5th oil circuit (20) is greater than the back pressure value of second one-way valve (15), then the oil liquid in the 5th oil circuit (20)
Allow to flow into fuel tank (1) by the second one-way valve (15).
6. a kind of tractor hydraulic machine stepless transmission according to claim 1 changes section and cooling hydraulic system, feature
It is, after the cooling and lubricating oil circuit parallel with one another includes distribution of lubrication oil road L1, PTO half front axle component lubrication road L2, PTO
Semiaxis component lubrication road L3 and brake lubricate road L4.
7. a kind of tractor hydraulic machine stepless transmission according to claim 1 changes section and cooling hydraulic system, feature
It is, pressure sensor is installed on the 5th oil circuit (20).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910066727.2A CN110056545A (en) | 2019-01-24 | 2019-01-24 | A kind of tractor hydraulic machine stepless transmission changes section and the hydraulic system of cooling and lubricating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910066727.2A CN110056545A (en) | 2019-01-24 | 2019-01-24 | A kind of tractor hydraulic machine stepless transmission changes section and the hydraulic system of cooling and lubricating |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110056545A true CN110056545A (en) | 2019-07-26 |
Family
ID=67316496
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910066727.2A Pending CN110056545A (en) | 2019-01-24 | 2019-01-24 | A kind of tractor hydraulic machine stepless transmission changes section and the hydraulic system of cooling and lubricating |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110056545A (en) |
-
2019
- 2019-01-24 CN CN201910066727.2A patent/CN110056545A/en active Pending
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| PB01 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20190726 |
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| WD01 | Invention patent application deemed withdrawn after publication |