The content of the invention
It is an object of the invention to provide a kind of gearbox and tractors, are asked with solving technology in the prior art
Topic.
Gearbox provided by the invention, including load speed changing portion, main speed changing portion and secondary speed changing portion;
The load speed changing portion, the main speed changing portion and the secondary speed changing portion are sequentially connected;
The load speed changing portion is driven including load input shaft, load output shaft, the high-grade driving gear of load, load top grade
Gear, the low-grade driving gear of load, the low-grade driven gear of load, reverse driving gear, reverse gear driven gear, the first synchronizer and
Wet clutch;
The reverse driving gear, first synchronizer, the high-grade driving gear of the load and the load are low-grade main
Moving gear is co-axially located on the load input shaft, and the high-grade driving gear of the load and the low-grade driving tooth of the load
Wheel is arranged on the same side of first synchronizer, and the reverse driving gear is arranged on the opposite side of first synchronizer;
The reverse gear driven gear, the high-grade driven gear of the load, the wet clutch and the load it is low-grade from
Moving gear is co-axially located on the load output shaft, and the reverse gear driven gear and the high-grade driven gear of the load are set
It puts in the same side of the wet clutch, the low-grade driven gear of load is arranged on the opposite side of the wet clutch;
The reverse driving gear and reverse gear driven gear engagement;
The high-grade driving gear of load and the high-grade driven gear engagement of the load;
The low-grade driving gear of load and the low-grade driven gear engagement of the load;
The wet clutch and the load output shaft are coaxially connected;
The load output shaft is connected with the main speed changing portion.
Further, it is driven between the reverse driving gear and the reverse gear driven gear by reverse idler gear;
The reverse idler gear is co-axially located on idler shaft, and driven with the reverse driving gear and the reverse gear respectively
Gear engages.
Further, load often engagement driving gear is also coaxially arranged on the load output shaft;
The opposite side that driving gear is arranged on the wet clutch is often engaged in the load;
Often engagement driving gear often engages driven gear engagement with loading for the load;
Often engagement driven gear is connected with the main speed changing portion for the load.
Further, gearbox further includes controller;
The controller is connected with the wet clutch, can control the connection status of the wet clutch.
Further, it is described to load high-grade driving gear and the low-grade driving gear of the load coaxially and be wholely set.
Further, the main speed changing portion include main transmission input shaft, main transformer speed output shaft, one grade of driving gear, one grade
Driven gear, two grades of driving gears, two grades of driven gears and the second synchronizer;
One end of the main transmission input shaft is connected with the load speed changing portion;
One grade of driving gear and two grades of driving gears are co-axially located on the main transmission input shaft;
The first speed driven gear, two grades of driven gears and second synchronizer are co-axially located at the main transformer speed
On output shaft;
The first speed driven gear and two grades of driven gears are separately positioned on the both ends of second synchronizer;
One grade of driving gear is engaged with the first speed driven gear;
Two grades of driving gears are engaged with two grades of driven gears.
Further, it is driven to further include third speed drive gear, third gear driven gear, fourth gear driving gear, fourth gear for gearbox
Gear and the 3rd synchronizer;
The third speed drive gear, the fourth gear driving gear and the 3rd synchronizer are co-axially located at the main transformer
On fast input shaft;
The third speed drive gear and the fourth gear driving gear are separately positioned on the both ends of the 3rd synchronizer;
The third gear driven gear and the fourth gear driven gear are co-axially located on the main transformer speed output shaft;
The third speed drive gear is engaged with the third gear driven gear;
The fourth gear driving gear is engaged with the fourth gear driven gear.
Further, the secondary speed changing portion includes secondary transmission input shaft, secondary speed change output shaft, secondary speed change low grade driving tooth
Wheel, secondary speed change low grade driven gear, secondary speed change middle-grade driving gear, secondary speed change middle-grade driven gear, middle-grade engaging sleeve and height
Shelves engaging sleeve;
The pair speed change low grade driving gear, the secondary speed change middle-grade driving gear and the middle-grade engaging sleeve are coaxially set
It puts on the secondary transmission input shaft;
The pair speed change low grade driving gear, the secondary speed change middle-grade driving gear are separately positioned on the middle-grade engaging sleeve
Both ends;
The high and low shift engaging sleeve, the secondary speed change low grade driven gear, the secondary speed change middle-grade driven gear are coaxial
It is arranged on the secondary speed change output shaft;
The pair speed change low grade driven gear, the secondary speed change middle-grade driven gear are arranged on the high and low shift engaging sleeve
The same end;
The pair speed change low grade driving gear is engaged with the secondary speed change low grade driven gear;
The pair speed change middle-grade driving gear is engaged with the secondary speed change middle-grade driven gear.
Further, gearbox further includes that secondary speed change often engages driving gear and secondary speed change often engages driven gear;
The output terminal that the pair speed change often engages driving gear and the main speed changing portion is coaxially connected;
The pair speed change often engages driving gear and often engages driven gear engagement with the secondary speed change;
The pair speed change often engages driven gear and is coaxially fixed on the secondary transmission input shaft;
The high and low shift engaging sleeve often engages driving gear coaxial arrangement with the secondary speed change.
The present invention also provides a kind of tractor, including gearbox described in any one of the above embodiments.
Gearbox and tractor provided by the invention are realized by wet clutch in the state of load, carry out height
The variation of shelves, and then steady more range shift, behaviour can be realized in the state of engine power is not cut off in operation interval
It is vertical simple, improve operating efficiency.
Specific embodiment
Technical scheme is clearly and completely described below in conjunction with attached drawing, it is clear that described implementation
Example is part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill
Personnel's all other embodiments obtained without making creative work, belong to the scope of protection of the invention.
In the description of the present invention, it is necessary to explanation, term " " center ", " on ", " under ", "left", "right", " vertical ",
The orientation or position relationship of the instructions such as " level ", " interior ", " outer " be based on orientation shown in the drawings or position relationship, merely to
Convenient for the description present invention and simplify description rather than instruction or imply signified device or element must have specific orientation,
With specific azimuth configuration and operation, therefore it is not considered as limiting the invention.
In addition, term " first ", " second ", " the 3rd " are only used for description purpose, and it is not intended that instruction or implying phase
To importance.
In the description of the present invention, it is necessary to illustrate, unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected or be integrally connected;It can
To be mechanical connection or be electrically connected;It can be directly connected, can also be indirectly connected by intermediary, Ke Yishi
Connection inside two elements.For the ordinary skill in the art, with concrete condition above-mentioned term can be understood at this
Concrete meaning in invention.
As shown in Figure 1, the present invention provides a kind of gearbox, including load speed changing portion 1, main speed changing portion 2 and secondary speed change
Portion 3;
The load speed changing portion 1, the main speed changing portion 2 and the secondary speed changing portion 3 are sequentially connected;
The load speed changing portion 1 includes load input shaft, load output shaft, the high-grade driving gear 1-3 of load, load top grade
Driven gear 1-8, the low-grade driving gear 1-4 of load, the low-grade driven gear 1-10 of load, reverse driving gear 1-1, reverse gear are driven
Gear 1-7, the first synchronizer 1-2 and wet clutch 1-9;
The reverse driving gear 1-1, the first synchronizer 1-2, it is described load top grade driving gear 1-3 and it is described bear
It carries low grade driving gear 1-4 to be co-axially located on the load input shaft, and described loads top grade driving gear 1-3 and described
Load low grade driving gear 1-4 is arranged on the same side of the first synchronizer 1-2, and the reverse driving gear 1-1 is arranged on
The opposite side of the first synchronizer 1-2;
The reverse gear driven gear 1-7, the high-grade driven gear 1-8 of the load, the wet clutch 1-9 and described negative
Carry low grade driven gear 1-10 be co-axially located on the load output shaft, and the reverse gear driven gear 1-7 and it is described bear
The same side that top grade driven gear 1-8 is arranged on the wet clutch 1-9 is carried, the low-grade driven gear 1-10 of load is set
In the opposite side of the wet clutch 1-9;
The reverse driving gear 1-1 and reverse gear driven gear 1-7 engagements;
The load top grade driving gear 1-3 and the high-grade driven gear 1-8 engagements of the load;
The load low grade driving gear 1-4 and the low-grade driven gear 1-10 engagements of the load;
The wet clutch 1-9 and the load output shaft are coaxially connected;
The load output shaft is connected with the main speed changing portion 2.
In the present embodiment, reverse driving gear 1-1 and load top grade driving gear 1-3 and the low-grade driving gear of load
1-4 is rotatably arranged on by bearing on load input shaft, and the first synchronizer 1-2 is coaxially fixed on load input shaft;
Reverse gear driven gear 1-7 and wet clutch 1-9 are coaxially fixed on load output shaft, load high-grade driven gear 1-8
It is rotatablely connected with the low-grade driven gear 1-10 of load by bearing and load output shaft.
When the first synchronizer 1-2 is connected with reverse driving gear 1-1, it is synchronous that load input shaft imparts power to first
Device 1-2, and then reverse driving gear 1-1 is passed to, rotation is passed to reverse gear driven gear 1-7 by reverse driving gear 1-1, into
And load output shaft is driven to rotate, realize power output.
When the first synchronizer 1-2 is connected with load top grade driving gear 1-3, load input shaft imparts power to first
Synchronizer 1-2, and then pass to the load top grade driving gear 1-3 or low-grade driving gear 1-4 of load;The high-grade driving gear of load
1-3 by rotation pass to load high-grade driven gear 1-8, load low grade driving gear 1-4 by rotation pass to load low grade from
Moving gear 1-10, at this point, by the way that wet clutch 1-9 and load top grade driven gear 1-8 are attached or by wet type clutch
Device 1-9 is attached with load low grade driven gear 1-10, and then realizes the conversion of high and low shift, and then is realized under loading condition,
High and low shift conversion when not cutting off power.
That is, wet clutch 1-9 is respectively altogether there are three types of state:It is synchronous with the high-grade driven gear 1-8 of load to turn
Driven gear 1-10 synchronous rotations dynamic, low-grade with load and the idle running in reverse gear.
The specific kind of drive is as follows:
Advance high-grade:Manipulate shift mechanism, make the first synchronizer 1-2 with load top grade driving gear 1-3 combined, wet type from
Clutch 1-9 is combined with load top grade driven gear 1-8, and drive line at this time is:Load the synchronizer 1-2 of input shaft S1 → first
The high-grade driving gear 1-3 → load top grade driven gear 1-8 → wet clutch 1-9 → load output shaft S2 → load of → load
Often driven gear 1-5 → main speed changing portion 2 is often engaged in engagement driving gear 1-11 → load.
Advance low-grade:Manipulate shift mechanism, make the first synchronizer 1-2 with load low grade driving gear 1-4 combined, wet type from
Clutch 1-9 is combined with load low grade driven gear 1-10, and drive line at this time is:Load the synchronizer 1- of input shaft S1 → first
The low-grade driving gear 1-4 → load low grade driven gear 1-10 → wet clutch 1-9 → load output shaft S2 of 2 → load → negative
It carries often engagement driving gear 1-11 → load and often engages driven gear 1-5 → main speed changing portion 2.
Reverse gear:Shift mechanism is manipulated, the first synchronizer 1-2 is made to be combined with reverse driving gear 1-1, drive line at this time
For:Load input shaft S1 → lazy 23 → reverse gear of the human relations driven gear 1-7 → load output shaft S2 of reverse driving gear 1-1 → reverse gear →
Often driven gear 1-5 → main speed changing portion 2 is often engaged in engagement driving gear 1-11 → load for load.
Preferred embodiment is to pass through reverse gear between the reverse driving gear 1-1 and the reverse gear driven gear 1-7
Idle pulley 1-6 is driven;
The reverse idler gear 1-6 is co-axially located on idler shaft, and respectively with the reverse driving gear 1-1 and it is described fall
The 1-7 engagements of shelves driven gear.
By the setting of reverse idler gear 1-6, the rotation side of reverse driving gear 1-1 and reverse gear driven gear 1-7 can be made
To identical, the i.e. reversion of realization load output shaft, and then realize reverse gear function.
Preferred embodiment is that load often engagement driving gear 1-11 is also coaxially arranged on the load output shaft;
The opposite side that driving gear 1-11 is arranged on the wet clutch 1-9 is often engaged in the load;
Often engagement driving gear 1-11 often engages driven gear 1-5 engagements with loading for the load;
Often engagement driven gear 1-5 is connected with the main speed changing portion 2 for the load.
Preferred embodiment is that gearbox further includes controller;
The controller is connected with the wet clutch 1-9, can control the connection shape of the wet clutch 1-9
State.
With the control of controller, it can realize that wet clutch 1-9 is connected respectively with load top grade driven gear 1-8, quilt
The high-grade driven gear 1-8 of load, which drives, to be rotated, and is connected with load low grade driven gear 1-10, is supported low-grade driven gear 1-10
It drives and rotates and be not connected to and dally with load top grade driven gear 1-8 and load low grade driven gear 1-10.
Preferred embodiment is that the load top grade driving gear 1-3 and the low-grade driving gear 1-4 of the load are coaxial
And it is wholely set.
Preferred embodiment is that the main speed changing portion 2 includes main transmission input shaft, main transformer speed output shaft, one grade of active
Gear 2-1, first speed driven gear 2-6, two grades of driving gear 2-2, two grades of driven gear 2-8 and the second synchronizer 2-7;
One end of the main transmission input shaft is connected with the load speed changing portion 1;
One grade of driving gear 2-1 and two grades of driving gear 2-2 are co-axially located on the main transmission input shaft;
The first speed driven gear 2-6, two grades of driven gear 2-8 and the second synchronizer 2-7 are co-axially located at
On the main transformer speed output shaft;
The first speed driven gear 2-6 and two grades of driven gear 2-8 are separately positioned on the second synchronizer 2-7's
Both ends;
One grade of driving gear 2-1 is engaged with the first speed driven gear 2-6;
Two grades of driving gear 2-2 are engaged with two grades of driven gear 2-8.
It is driven that gearbox further includes third speed drive gear 2-3, third gear driven gear 2-9, fourth gear driving gear 2-5, fourth gear
Gear 2-10 and the 3rd synchronizer 2-4;
The third speed drive gear 2-3, the fourth gear driving gear 2-5 and the 3rd synchronizer 2-4 are coaxially disposed
On the main transmission input shaft;
The third speed drive gear 2-3 and the fourth gear driving gear 2-5 are separately positioned on the 3rd synchronizer 2-4's
Both ends;
The third gear driven gear 2-9 and the fourth gear driven gear 2-10 are co-axially located at the main transformer speed output shaft
On;
The third speed drive gear 2-3 is engaged with the third gear driven gear 2-9;
The fourth gear driving gear 2-5 is engaged with the fourth gear driven gear 2-10.
In the present embodiment, often engagement driving gear 1-11 is fixedly and coaxially connected with load output shaft for load, and load is often nibbled
Driven gear 1-5, one grade of driving gear 2-1, two grades of driving gear 2-2 and the 3rd synchronizer 2-4 is closed to input with main transformer speed
Axis is fixedly and coaxially connected;Third speed drive gear 2-3 and fourth gear driving gear 2-5 is rotated by bearing and main transmission input shaft to be connected
It connects;Second synchronizer 2-7, third gear driven gear 2-9 and fourth gear driven gear 2-10 and main transformer speed output shaft are fixedly and coaxially connected,
First speed driven gear 2-6 and two grades of driven gear 2-8 is rotatablely connected by bearing and main transformer speed output shaft.
As seen from Figure 1, after load speed changing portion 1 enters main speed-changing mechanism, the gear change in main speed changing portion 2
For:
One grade:Shift mechanism is manipulated, the second synchronizer 2-7 is made to be combined with first speed driven gear 2-6, drive path at this time
For two.
Drive line 1 is:Load speed changing portion 1 → main transmission input shaft S3 → mono- grade driving gear 2-1 → mono- grade driven tooth
Take turns the synchronizer 2-7 of 2-6 → second → main transformer speed output shaft S4 → pair speed changing portion 3;
Drive line 2 is:Load speed changing portion 1 → main transmission input shaft S3 → mono- grade driving gear 2-1 → mono- grade driven tooth
Wheel 2-6 → second synchronizer 2-7 → main transformer speed output shaft S4 → pair speed change often engage driving gear 3-5 → pair speed change it is normal engage from
Moving gear 3-1 → pair speed changing portion 3.
Two grades:Shift mechanism is manipulated, the second synchronizer 2-7 is made to be combined with two grades of driven gear 2-8, drive path at this time
For two.
Drive line 1 is:It is driven to load speed changing portion 1 → main transmission input shaft S3 → bis- grade driving gear 2-211 → bis- grade
The synchronizer 2-7 of gear 2-8 → second → main transformer speed output shaft S4 → pair speed changing portion 3;
Drive line 2 is:Load speed changing portion 1 → main transmission input shaft S3 → bis- grade driving gear 2-2 → bis- grade driven tooth
Wheel 2-8 → second synchronizer 2-7 → main transformer speed output shaft S4 → pair speed change often engage driving gear 3-5 → pair speed change it is normal engage from
Moving gear 3-1 → pair speed changing portion 3.
Third gear:Shift mechanism is manipulated, the 3rd synchronizer 2-4 is made to be combined with third speed drive gear 2-3, drive path at this time
For two.
Drive path 1 is:Load the synchronizer 2-4 of speed changing portion 1 → main transmission input shaft S3 → the 3rd → third speed drive gear
2-3 → third gear driven gear 2-9 → main transformer speed output shaft S4 → pair speed changing portion 3;
Drive path 2 is:Load the synchronizer 2-4 of speed changing portion 1 → main transmission input shaft S3 → the 3rd → third speed drive gear
2-3 → third gear driven gear 2-9 → main transformer speed output shaft S4 → pair speed change often engage driving gear 3-5 → pair speed change often engagement from
Moving gear 3-1 → pair speed changing portion 3.
Fourth gear:Shift mechanism is manipulated, the 3rd synchronizer 2-4 is made to be combined with fourth gear driving gear 2-5, drive path at this time
For two.
Drive path 1 is:Load the synchronizer 2-4 of speed changing portion 1 → main transmission input shaft S3 → the 3rd → fourth gear driving gear
2-5 → fourth gear driven gear 2-10 → main transformer speed output shaft S4 → pair speed changing portion 3;
Drive path 2 is:Load the synchronizer 2-4 of speed changing portion 1 → main transmission input shaft S3 → the 3rd → fourth gear driving gear
2-5 → fourth gear driven gear 2-10 → main transformer speed output shaft S4 → pair speed change often engages driving gear 3-5 → pair speed change and often engages
Driven gear 3-1 → pair speed changing portion 3.
Preferred embodiment is that it is low that the pair speed changing portion 3 includes secondary transmission input shaft, secondary speed change output shaft, secondary speed change
Shelves driving gear 3-2, secondary speed change low grade driven gear 3-7, secondary speed change middle-grade driving gear 3-4, secondary speed change middle-grade driven gear
3-8, middle-grade engaging sleeve 3-3 and high and low shift engaging sleeve 3-6;
The pair speed change low grade driving gear 3-2, the pair speed change middle-grade driving gear 3-4 and middle-grade engaging sleeve 3-
3 are co-axially located on the secondary transmission input shaft;
The pair speed change low grade driving gear 3-2, the pair speed change middle-grade driving gear 3-4 are separately positioned on the middle-grade
The both ends of engaging sleeve 3-3;
The high and low shift engaging sleeve 3-6, the secondary speed change low grade driven gear 3-7, the secondary speed change middle-grade driven gear
3-8 is co-axially located on the secondary speed change output shaft;
The pair speed change low grade driven gear 3-7, the pair speed change middle-grade driven gear 3-8 are arranged on the high and low shift and nibble
The same end of trap 3-6;
The pair speed change low grade driving gear 3-2 is engaged with the pair speed change low grade driven gear 3-7;
The pair speed change middle-grade driving gear 3-4 is engaged with the pair speed change middle-grade driven gear 3-8.
Preferred embodiment is, the secondary speed change that gearbox further includes often engage driving gear 3-5 and the often engagement of secondary speed change from
Moving gear 3-1;
The pair speed change often engages driving gear 3-5 and the output terminal of the main speed changing portion 2 is coaxially connected;
The pair speed change often engages driving gear 3-5 and often engages driven gear 3-1 engagements with the secondary speed change;
The pair speed change often engages driven gear 3-1 and is coaxially fixed on the secondary transmission input shaft;
The high and low shift engaging sleeve 3-6 often engages driving gear 3-5 coaxial arrangements with the secondary speed change.
In the present embodiment, secondary speed change often engages driving gear 3-5 and is coaxially fixed on main transformer speed output shaft;Pair becomes
Fast often engagement driven gear 3-1, pair speed change low grade driving gear 3-2 and middle-grade engaging sleeve 3-3 are coaxially fixed at secondary change
On fast input shaft;Secondary speed change middle-grade driving gear 3-4 is rotatably arranged on by bearing on secondary transmission input shaft;High and low shift engaging sleeve
3-6 and pair speed change middle-grade driven gear 3-8 are coaxially fixed on secondary speed change output shaft, secondary speed change low grade driven gear 3-
7 are rotatably arranged on by bearing on secondary speed change output shaft.
After main speed changing portion 2 enters secondary speed changing portion 3, the transforming gear in secondary speed changing portion 3 is:
It is low-grade:Shift mechanism is manipulated, high and low shift engaging sleeve 3-6 is made to be combined with pair speed change low grade driven gear 3-7, at this time
Drive line is:Main speed changing portion 2 → pair transmission input shaft S5 → pair speed change low grade driving gear 3-2 → pair speed change low grade driven tooth
Take turns 3-7 → high and low shift engaging sleeve 3-6 → pair speed change output shaft S6 → output.
Middle-grade:Shift mechanism is manipulated, middle-grade engaging sleeve 3-3 is made to be combined with pair speed change middle-grade driving gear 3-4, biography at this time
Dynamic route is:Main speed changing portion 2 → pair transmission input shaft S5 → middle-grade engaging sleeve 3-3 → pair speed change middle-grade driving gear 3-4 → pair
Speed change output shaft S6 → output.
It is high-grade:Shift mechanism is manipulated, high and low shift engaging sleeve 3-6 is made often to engage driving gear 3-5 with secondary speed change and is combined, at this time
Drive path be:Main 2 → high and low shift of speed changing portion engaging sleeve 3-6 → pair speed change output shaft S6 → output.
The gearbox of the present invention is divided into load speed changing portion 1, main speed changing portion 2 and secondary speed changing portion it can be seen from the above
3。
Loading speed changing portion 1 includes shuttle-type gear shift section and load shift section, and wherein shuttle-type gear shift section can be realized and dragged
The drive shift and reverse gear of machine drawing, load shift section realize high-grade, low-grade conversion of advancing, and main speed changing portion 2 is using same with second
It walks two synchronizers of device 2-7 and the 3rd step device and carries out gear shift, be divided into four shelves, secondary speed changing portion 3 can realize high, medium and low three
The conversion of gear, entire gearbox can realize the gear arrangement of 24 drive shifts and 12 reverse gears.Wherein shuttle-type gear shift section
With main speed changing portion 2 using synchronizer shift, load shift section realizes gear shift by wet clutch 1-9 by oil pressure cntrol,
Secondary speed changing portion 3 realizes high, medium and low switching using engaging sleeve.
In the present invention, as shown in Figure 1, entire transmission assembly shares seven transmission shafts, S1 is load input shaft, and S2 is
Load output shaft, S3 are main transmission input shaft, and S4 is main speed change output shaft, and S5 is secondary transmission input shaft, and S6 is that secondary speed change exports
Axis, S7 are lazy human relations axis.
In shuttle-type gear shift section, tooth hubs of the load input shaft S1 respectively with the first synchronizer 1-2 is coupled by spline, and first
The both sides of synchronizer 1-2 combine gear ring wind and are not joined with reverse driving gear 1-1 and load top grade driving gear 1-3 by spline
It connects, load top grade driving gear 1-3 is fixed together through roller bearing with load low grade driving gear 1-4 in load input shaft
It is freely rotated on S1, idler shaft S7 is mounted on babinet, and reverse idler gear 1-6 can freely be turned by roller bearing on idler shaft S7
Dynamic, reverse gear driven gear 1-7 is coupled with load output shaft S2 by spline, and it is driven to load high-grade driven gear 1-8, load low grade
Gear 1-10 is coupled with wet clutch 1-9 by spline, and wet clutch 1-9 is fixed on load output shaft S2, load
Often engagement driving gear 1-11 is coupled with power commutation output shaft S2 by spline.
In main speed changing portion 2, load often engagement driven gear 1-5 and be fixed on main transmission input shaft S3, main transmission input shaft
Tooth hubs of the S3 respectively with one grade of driving gear 2-1, two grades of driving gear 2-2, the 3rd synchronizer 2-4 is coupled by spline, and the 3rd
The both sides of synchronizer 2-4 are coupled with reference to gear ring with third speed drive gear 2-3 and fourth gear driving gear 2-5 by spline respectively, main
The tooth hub of the second synchronizer 2-7, third gear driven gear 2-9, fourth gear driven gear 2-10 pass through spline to speed change output shaft S4 respectively
Connection, the both sides of the second synchronizer 2-7 pass through flower with first speed driven gear 2-6 and two grades of driven gear 2-8 respectively with reference to gear ring
Key connecting, secondary speed change often engage driving gear 3-5 and are fixed on main transformer speed output shaft S4.
In secondary speed changing portion 3, secondary speed change often engages driven gear 3-1 and pair speed change low grade driving gear 3-2 and is fixed in secondary change
On fast input shaft S5, middle-grade engaging sleeve 3-3 is coupled by spline with secondary transmission input shaft, and secondary speed change middle-grade driving gear 3-4 leads to
It crosses roller bearing to be freely rotated on secondary transmission input shaft S5, high and low shift engaging sleeve 3-6, pair speed change middle-grade driven gear 3-8 lead to
It crosses spline with pair speed change output shaft S6 to couple, secondary speed change low grade driven gear 3-7 can be freely rotated on high and low shift engaging sleeve 3-6.
The present invention also provides a kind of tractor, including gearbox described in any one of the above embodiments.
Gearbox and tractor provided by the invention are realized by wet clutch 1-9 in the state of load, are carried out high
Low-grade variation, and then steady more range shift can be realized in the state of engine power is not cut off in operation interval,
It manipulates simply, improves operating efficiency.
Finally it should be noted that:The above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations;To the greatest extent
Pipe is described in detail the present invention with reference to foregoing embodiments, it will be understood by those of ordinary skill in the art that:Its according to
Can so modify to the technical solution recorded in foregoing embodiments either to which part or all technical characteristic into
Row equivalent substitution;And these modifications or replacement, the essence of appropriate technical solution is not made to depart from various embodiments of the present invention technology
The scope of scheme.