CA1115990A - Tractor having a power takeoff mechanism - Google Patents
Tractor having a power takeoff mechanismInfo
- Publication number
- CA1115990A CA1115990A CA350,838A CA350838A CA1115990A CA 1115990 A CA1115990 A CA 1115990A CA 350838 A CA350838 A CA 350838A CA 1115990 A CA1115990 A CA 1115990A
- Authority
- CA
- Canada
- Prior art keywords
- power takeoff
- transmission case
- tractor
- gear
- shaft
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K17/00—Arrangement or mounting of transmissions in vehicles
- B60K17/28—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or type of power take-off
Abstract
Abstract of the Disclosure A tractor having a power takeoff mechanism including two power takeoff shafts driven by output of a differential mechanism for rear wheel drive.
One of the power takeoff shafts has a transmission clutch to switch between a position to rotate in synchronism with rear wheels of the tractor and a position to stay still while the rear wheels rotate.
The other power takeoff shaft is adapted to constantly and synchronously rotate with the rotation of the rear wheels. These two power takeoff shafts are disposed in an auxiliary transmission case attached to a bottom portion of a rear wheel drive transmission case.
One of the power takeoff shafts has a transmission clutch to switch between a position to rotate in synchronism with rear wheels of the tractor and a position to stay still while the rear wheels rotate.
The other power takeoff shaft is adapted to constantly and synchronously rotate with the rotation of the rear wheels. These two power takeoff shafts are disposed in an auxiliary transmission case attached to a bottom portion of a rear wheel drive transmission case.
Description
~s~
TRAC'rOR HAVXNG A POWER TA~OFF MECHhNISM
Background ot the Invention The present invention relates to a tractor having a power takeof~ mechanism to tra~smit pvwer to two power takeof~ sha~t~
As a power takeoff mechanism o~ the above t~pe a power takeoff ~haf~ i~ ofte~ rsquired which rotates in s~nchronism with ~ dri~e pinion sha~t o~
a rear wheel di~ferential mechanism mounted in transmission case. Such a requirement ari~es wher~
for example, a tractor i~ a four wheel drive type, that is both front and rear wheel~ are dri~en, and the rotation of the rear wheels and that of the ~ront wheels need to be ~ynchronizea. The re~uire~ent ari~es al~o where it is desired to driv~ a working implement such a~ a sower or a pla~tar which has fixed relationship with the travelling speed.
Where one power takeoff shaft i8 used to drive the front wh~els as described above 9 a further power takeo~ sha~t is required ko drive a working implement of various types. To suit a purpose it iY
desirab~e, when two power takeo~f shaft~ are provided~
to arrange one of them to be disconnected from th~
drive pinion shaft of the rear wheel differential mechanism while the other ma~ of course remain in 1- ~
operative connection with the dri~re pinion ~haf~;.
It is also necessary to provide a mechanism simple in con~truetion a~d easy to as~emble which permits power to be given to t~e two power ~akeoI~ shaft~.
5 Summar;y of ths Inventio2~
~ he ob~ect of the preserlt i~vention ~g to provide a tractor having ~ power takeoff mecha~ism which meets the above requireme~t;.
~ he tractor ha~ g a power takeo:Ef meehani~a 10 accordi~g to t;he prese~t irlvention compri~e~ a rear wheel drive transmis~ion case housing a di~erential mschanism for rear ~heels, an auxiliar;sr trarlsmission ca~e attached to a bottom portion of the rear wheel drive tran~mission case, a first power takeoff sha~t supported by the auxiliary tran~mi~sion case~ a gear mounted on the first power takeo~f shaft and adapted to receiv~ torque from the dif~erential mecha~lism for rear wheel~ and to rotat~ in association with rotation of the rear wheel3, a tra~smission clutch 20 disposed in the auxiliary tran~mission case to connect and disconrlect an interlocking between the first power takeoff ~haft ~d the gear I a second power takeoff shPft ~upported by th0 auxiliar~sr tran~mission ca~e, and a further gear ~ixed to the second power takeoff 25 shaft and operativelg connected with the said gear.
Thus the inve~tion ha~ realized a tractor serving varied purpose~ b;sr arran~Sing that the di~ferential mechani~m for the rear wheels provides power for drivi~g the two power takeoff shaftsO Whe~ the first pewer 5 takeoff ~haft is u~;ed to dri~e the front wheels Or the tractor, ~or example, the tractor ~a~sr be propelled by the four wheels, a~d in this case there i~
advantage that the ~eco~d power takeofI shaft ~ay be ~onnected with one of various working implement~ ~r 10 pro ~rided with a parkin~; brake mach~ismO
- Furthermore, ~i~ce the fir~t power takeoff shaft i8 provided with a tran~mis~ion clutch, this power takeof~ shaft i~ ~witchable between a po~ition to rotate in association with the rear wheels and a 15 po~itio~ ~o ~tay 8t;ill while the rear wheel~ are rotating.
Thu~ t the ~ir~t power takeoff shaft ma;r be ~topped rotatin~s when ths first power takeoiEf ~haft is used to dri~re the front wheels a~ described in view OI th~
fact that the steeri:ng operatio~ i8 ea~i~r on the road 20 or the like when the tractor i8 propelled b;sr ltwo wheel~
than four. When the f`our wheel drive i3 de3irE~bl~
during a certain operation t then the tran~ sio~
clutch is op~rated to provide the four wheel driv~
When the firs~ power takeoff ~haf~ i~ to be connected with ~ome other working implement, it can dri~e a working implement ~uch as a rotary plow which makes ~ 3 ~
9~
the transmission clu~ch useful.
Furthermore, ~i~ce th~ second power tak~o~
shaft i5 not provid~d with a transmis~ion clutch~ it constantly rotates in s~nchronism with the rear wheels.
Therefore the ~econd power takeof~ shaft may be use~
to drive a planter, a sower or other ~uch impleme~ts that have a ~ d relationship with th~ travelling speed o~ the tractor or that ought to stop operating when the tractor stop~.
It will be u~der~tood from the above that the provision o~ two power takeoff shafts increase~
the functional range o~ the tractorO
~ o allow power to be transmitted to these two power takeoff 3hafts, the two power takeoff shafts are supported b~ the auxiliary tranæmission cnse whic~
i attached to a botto~ portion of the rear wheel dri~e transmissio~ case. Therefor~ thc invention may be put into practice without necessitating a~ extensi~e modification to the existing constructionl and thus there are advantages of simple construction and e~sg a~sembl~.
In arranging to obtain power from the differential mechanism for the rear wheels, power is tran~mitted to the gear of the first power takeoff shaft and this gear provides power to dri.ve the second power takeoff shaft~
~his results in a simple and compact drive transmis~ion s~stem compared wi~h the case in which p5Wer iS
transmitted from the differential mechanism to each of the first and second power taXeoff sh~ts.
Othor object~ and ~dvantages of the present invention will be apparent from the following descriptio~.
Brief Description of the Drawing~
In the drawing~ illustrating a tractor havlng a power takeo~f mechani~m according to the presen~t invention, Fig~ 1 is a side vi~w o~ the tractor, Fig~ ~ is a ~ide ~iew of a portion where a brake mcchanism i~ attached, Fig. 3 is a side ~iew in vertical ~ection of the portion shown i~ Fig. 2, Fig. 4 i~ a fro~t view partly in sectio~ of the portion ~hown in Figs. 2 and 3, Fig. 5 i~ a section taken on line V-V in Fi~. 4, and Fig. 6 is a sectional view of a principal portion where a universal joint is provided.
Detaile~ Description of the Preferred F,mbodiments Fig. 1 is a side view ~f ~ follr wheel drive t~pe tractor which has an engine 1, a clutch housing 2, a front transmission case 3 housin~ ~ gear travelling speed change mechanism (not sho~n)~ and a rear wheel drive transmis~ion casa 5 housing a differential mechanism 4 four rear wheel~ (Fig. 2~o The clutch housing 2, the ~ront transmiasion cas~ 3 and the rear transmission case 5 are connected one with adJacent other to for~ an elongate frame exte~ding longitudinall~
o~ the tractor. A pair of r~ght and left front wheels 6, 6 are disposed below and la~erally of the engi~e 1, and a pair of right and left rear wheels 7, 7 are attached to the rear whe~1 drive tra~mission ~se 5.
Number 8 denotes a driver'~ seat mounted Q~
top o~ the rear wheel drive transmission case 5.
~umber 9 denote~ a steering wheel to pro~ide a directional control o~ the front wheels 6, 6. Number 10 denote~
a travelling speed change lever proaecting from the top of the front transmis~ion case 3, ~nd number 11 denotes a co~trol lever for operating a bra~e ~echanism 12 described later.
A construction for tran~mitting power to the front wheel~ 6, 6 and a brake mechanism us~d main:L~ at parking times are described next with reference to Figs. 2 to 5.
An auxiliary transmi~sion case 15 is attached to a bottom portion of the rear wheel drive transmission case 5, which auxiliary transmission case 15 support~
a first power takeoff shaft 13 .for transmitting power to the front wheels 6, 6 and a second power taXeoff shaft 14 adapted to receive a braki~g action of the brake mechanism 12~ ~he rear wheel drive transmi3sion case 5 houses a gear interlooking mecha~ism 16 compri~ing a first gear 16a ~ixed to a drive pinion shaft 4a o~
the diffe~ential mechani~m 4~ a ~econd gear 16b freel~
rotatably mount~d on a ~haft 18 for tr~nsmit~in~
output from the front transmission case 3 rearwardl~
to a third power takeoff sh~ft 177 ~d a third gear 16c which is an output ge~r ~ormed integral with the second gear 16b.
rhe auxiliary tran~mi~sion case 15 houses a gear interlocking mechanism comprising a gear 19 in me~h with the third gear 16c and freely rotatably mounted on ~he first power takeoff ~haft 13, an inter-mediate ~ree rotation gear 20 in mesh wLth the gear 19, and a ~ear 21 in mesh with the gear 20 and fixed to the second power takeoff shaft ~4. The auxiliar~
tran~mission case 15 further houses a transmi~sion clutch 22 adapted to switch the first power takeoff shaft 23 between a drive position an~ a non-drive position by moving a ~ovable member 22a splined to the first power takeoff sha~t 13 in and out of enga~ement with a boss portion of the gear 19. Th~ clutch 22 i8 put out of action to facilitate ~teering when the tractor travels on the road. tIt is easier to ste~r a two wheel dri~e vehicle than a î OUI' wheel dri~e vehicle. ) The movable membel 22a of the tra:tlsmissicn clutch 22 is mad~ to slid~ in axi~l direction~ by 5 oscill~tion o~ a ~hift fork 23 supported by the au~iliar~y transmission ca~e 15 oscillatabl;y about a tranE~Ver3~ ~1Xi8~ The shift fork 23 i8 o~cillated by vertical oscilla~ion o~ an o~cillatable arm 24 fixsa to a portion of the fork 23 pro jecting from ~h~
au~iliar;lr tIa~sm~ ~io~ case 15~ and the arm 24 1~
vertically o~cillated b~ ~ vertical movament of a clutch operating lever 25.
The ~uxiliary transmission cas~ 15 is connected with the brake mechanism 1~! which is ~dapted to apply 15 a braking action to the second power talceo~f shaft 14.
Thi~ brake mecha~i~m 12 is sn interIlall~ actirLg typc comprisin~3 a drum 12a :Eixed to the second power takeoff shaft 14 and a p~ir of braki~g member~ 12b, 12b to pres~ against an inner p~riphery of the drum 12a~
~ach of the braking member~ 12b, 12b is oscillatabl~
supported at on3~end thereof by a support rod 26 ~i~ed .. ~ to a brake case~and is pre~sed at the other end by a J~,~ 3 cam ~haft 26 rotatably suppoxted by the brak~ case~.
~'4 The cam ~haft 2~ ha~ an end portion outsi~ the brake case securely connect~d to an oscillatable arm Z7 which is operatively connected to the brake operating lever 11 through a rod 28. ~he lever 11 is vertically oscillatably pivoted a~d adapted to be locked in a desired position by ~ ratchet mechanism 29 compri~ing a ratchet pawl 29a ~rld a lock receiving member 29b.
5 The ratchet pawl 2~a i~ oscillatable by a press elem~nt 30 provide~ at an upper end o~ a grip portion o:E the lever 11,.
The brake mechanism 12 assumes an operative position to appl~ a braking aetion to the rear wheel~
10 7s 7 and to the front wheel~ too if th~ latter are in a state of drivi~g, when the lelrer 11 is pulled up and an ~noperative position whe~ the lev0r 11 i~ broughll;
down .
Number 31 denotes a slide gea:r splined to the 15 drive pinion ~ha:ft; 4a,. A tran~missîon shaft 32 receives output ~rom the front transmi~ion case! 3 in which the drive has been subjected to a speed change, and an output of the shaft 32 i~ transmitted by the gear 313, in two speeds to the drive pinioIl ~haft 4a. Number 20 denotes a transmission case interposed betw~e~ a case ~3 ~4 housing a differential mechanism (not shown) for the front wheel~ 6, 6 and tha auxiliary tran3mission ca~e 15.
Fig. 6 shows a rnode of use wherein the brake 25 mechanism 12 has been removed from the auxiliary transmission case 15 an~ a universal join~ is conn~cted to the second power takeoff shaft 14. ~his arrange-ment enables various wor~ing i~plements such as a sower and a planter to be driven by a drive shaft 36 connect0d to the universal joint 35. In this instance, since the second pow~r takeof~ sha~t 14 is drive~ in association with the rear whe~l drive, a sowing or planting operation conveniently stop~ as the tractor stop~ travelling.
Though not ~hown in the drawings, the ~irst power takeoff shaft 13 and the front wheel drive mechanism 33 ma~ be disconnected and the universa:l joint 35 and the drive shaft may be connec~ed to the first power takeoff shaft 13 whereby the first power takeo~f sha~t 13 is ussd to drive various working implements such as a lawn mower and a rotar~ plow.
In this ca~e, since the first power takeoff ~ha~t 13 is provided with the transmission clutch 22~ such a working implement may be stopped temporarily while the tractor i8 travelling to thereby facilitate direct;ional changes and the like during a plowing operation. lf a working implement is suited for operation irrespective of travelling of the tractor such as when the tractor is standing still, then the implement ma~ be operatively connected to the third power takeoff shaft 17.
TRAC'rOR HAVXNG A POWER TA~OFF MECHhNISM
Background ot the Invention The present invention relates to a tractor having a power takeof~ mechanism to tra~smit pvwer to two power takeof~ sha~t~
As a power takeoff mechanism o~ the above t~pe a power takeoff ~haf~ i~ ofte~ rsquired which rotates in s~nchronism with ~ dri~e pinion sha~t o~
a rear wheel di~ferential mechanism mounted in transmission case. Such a requirement ari~es wher~
for example, a tractor i~ a four wheel drive type, that is both front and rear wheel~ are dri~en, and the rotation of the rear wheels and that of the ~ront wheels need to be ~ynchronizea. The re~uire~ent ari~es al~o where it is desired to driv~ a working implement such a~ a sower or a pla~tar which has fixed relationship with the travelling speed.
Where one power takeoff shaft i8 used to drive the front wh~els as described above 9 a further power takeo~ sha~t is required ko drive a working implement of various types. To suit a purpose it iY
desirab~e, when two power takeo~f shaft~ are provided~
to arrange one of them to be disconnected from th~
drive pinion shaft of the rear wheel differential mechanism while the other ma~ of course remain in 1- ~
operative connection with the dri~re pinion ~haf~;.
It is also necessary to provide a mechanism simple in con~truetion a~d easy to as~emble which permits power to be given to t~e two power ~akeoI~ shaft~.
5 Summar;y of ths Inventio2~
~ he ob~ect of the preserlt i~vention ~g to provide a tractor having ~ power takeoff mecha~ism which meets the above requireme~t;.
~ he tractor ha~ g a power takeo:Ef meehani~a 10 accordi~g to t;he prese~t irlvention compri~e~ a rear wheel drive transmis~ion case housing a di~erential mschanism for rear ~heels, an auxiliar;sr trarlsmission ca~e attached to a bottom portion of the rear wheel drive tran~mission case, a first power takeoff sha~t supported by the auxiliary tran~mi~sion case~ a gear mounted on the first power takeo~f shaft and adapted to receiv~ torque from the dif~erential mecha~lism for rear wheel~ and to rotat~ in association with rotation of the rear wheel3, a tra~smission clutch 20 disposed in the auxiliary tran~mission case to connect and disconrlect an interlocking between the first power takeoff ~haft ~d the gear I a second power takeoff shPft ~upported by th0 auxiliar~sr tran~mission ca~e, and a further gear ~ixed to the second power takeoff 25 shaft and operativelg connected with the said gear.
Thus the inve~tion ha~ realized a tractor serving varied purpose~ b;sr arran~Sing that the di~ferential mechani~m for the rear wheels provides power for drivi~g the two power takeoff shaftsO Whe~ the first pewer 5 takeoff ~haft is u~;ed to dri~e the front wheels Or the tractor, ~or example, the tractor ~a~sr be propelled by the four wheels, a~d in this case there i~
advantage that the ~eco~d power takeofI shaft ~ay be ~onnected with one of various working implement~ ~r 10 pro ~rided with a parkin~; brake mach~ismO
- Furthermore, ~i~ce the fir~t power takeoff shaft i8 provided with a tran~mis~ion clutch, this power takeof~ shaft i~ ~witchable between a po~ition to rotate in association with the rear wheels and a 15 po~itio~ ~o ~tay 8t;ill while the rear wheel~ are rotating.
Thu~ t the ~ir~t power takeoff shaft ma;r be ~topped rotatin~s when ths first power takeoiEf ~haft is used to dri~re the front wheels a~ described in view OI th~
fact that the steeri:ng operatio~ i8 ea~i~r on the road 20 or the like when the tractor i8 propelled b;sr ltwo wheel~
than four. When the f`our wheel drive i3 de3irE~bl~
during a certain operation t then the tran~ sio~
clutch is op~rated to provide the four wheel driv~
When the firs~ power takeoff ~haf~ i~ to be connected with ~ome other working implement, it can dri~e a working implement ~uch as a rotary plow which makes ~ 3 ~
9~
the transmission clu~ch useful.
Furthermore, ~i~ce th~ second power tak~o~
shaft i5 not provid~d with a transmis~ion clutch~ it constantly rotates in s~nchronism with the rear wheels.
Therefore the ~econd power takeof~ shaft may be use~
to drive a planter, a sower or other ~uch impleme~ts that have a ~ d relationship with th~ travelling speed o~ the tractor or that ought to stop operating when the tractor stop~.
It will be u~der~tood from the above that the provision o~ two power takeoff shafts increase~
the functional range o~ the tractorO
~ o allow power to be transmitted to these two power takeoff 3hafts, the two power takeoff shafts are supported b~ the auxiliary tranæmission cnse whic~
i attached to a botto~ portion of the rear wheel dri~e transmissio~ case. Therefor~ thc invention may be put into practice without necessitating a~ extensi~e modification to the existing constructionl and thus there are advantages of simple construction and e~sg a~sembl~.
In arranging to obtain power from the differential mechanism for the rear wheels, power is tran~mitted to the gear of the first power takeoff shaft and this gear provides power to dri.ve the second power takeoff shaft~
~his results in a simple and compact drive transmis~ion s~stem compared wi~h the case in which p5Wer iS
transmitted from the differential mechanism to each of the first and second power taXeoff sh~ts.
Othor object~ and ~dvantages of the present invention will be apparent from the following descriptio~.
Brief Description of the Drawing~
In the drawing~ illustrating a tractor havlng a power takeo~f mechani~m according to the presen~t invention, Fig~ 1 is a side vi~w o~ the tractor, Fig~ ~ is a ~ide ~iew of a portion where a brake mcchanism i~ attached, Fig. 3 is a side ~iew in vertical ~ection of the portion shown i~ Fig. 2, Fig. 4 i~ a fro~t view partly in sectio~ of the portion ~hown in Figs. 2 and 3, Fig. 5 i~ a section taken on line V-V in Fi~. 4, and Fig. 6 is a sectional view of a principal portion where a universal joint is provided.
Detaile~ Description of the Preferred F,mbodiments Fig. 1 is a side view ~f ~ follr wheel drive t~pe tractor which has an engine 1, a clutch housing 2, a front transmission case 3 housin~ ~ gear travelling speed change mechanism (not sho~n)~ and a rear wheel drive transmis~ion casa 5 housing a differential mechanism 4 four rear wheel~ (Fig. 2~o The clutch housing 2, the ~ront transmiasion cas~ 3 and the rear transmission case 5 are connected one with adJacent other to for~ an elongate frame exte~ding longitudinall~
o~ the tractor. A pair of r~ght and left front wheels 6, 6 are disposed below and la~erally of the engi~e 1, and a pair of right and left rear wheels 7, 7 are attached to the rear whe~1 drive tra~mission ~se 5.
Number 8 denotes a driver'~ seat mounted Q~
top o~ the rear wheel drive transmission case 5.
~umber 9 denote~ a steering wheel to pro~ide a directional control o~ the front wheels 6, 6. Number 10 denote~
a travelling speed change lever proaecting from the top of the front transmis~ion case 3, ~nd number 11 denotes a co~trol lever for operating a bra~e ~echanism 12 described later.
A construction for tran~mitting power to the front wheel~ 6, 6 and a brake mechanism us~d main:L~ at parking times are described next with reference to Figs. 2 to 5.
An auxiliary transmi~sion case 15 is attached to a bottom portion of the rear wheel drive transmission case 5, which auxiliary transmission case 15 support~
a first power takeoff shaft 13 .for transmitting power to the front wheels 6, 6 and a second power taXeoff shaft 14 adapted to receive a braki~g action of the brake mechanism 12~ ~he rear wheel drive transmi3sion case 5 houses a gear interlooking mecha~ism 16 compri~ing a first gear 16a ~ixed to a drive pinion shaft 4a o~
the diffe~ential mechani~m 4~ a ~econd gear 16b freel~
rotatably mount~d on a ~haft 18 for tr~nsmit~in~
output from the front transmission case 3 rearwardl~
to a third power takeoff sh~ft 177 ~d a third gear 16c which is an output ge~r ~ormed integral with the second gear 16b.
rhe auxiliary tran~mi~sion case 15 houses a gear interlocking mechanism comprising a gear 19 in me~h with the third gear 16c and freely rotatably mounted on ~he first power takeoff ~haft 13, an inter-mediate ~ree rotation gear 20 in mesh wLth the gear 19, and a ~ear 21 in mesh with the gear 20 and fixed to the second power takeoff shaft ~4. The auxiliar~
tran~mission case 15 further houses a transmi~sion clutch 22 adapted to switch the first power takeoff shaft 23 between a drive position an~ a non-drive position by moving a ~ovable member 22a splined to the first power takeoff sha~t 13 in and out of enga~ement with a boss portion of the gear 19. Th~ clutch 22 i8 put out of action to facilitate ~teering when the tractor travels on the road. tIt is easier to ste~r a two wheel dri~e vehicle than a î OUI' wheel dri~e vehicle. ) The movable membel 22a of the tra:tlsmissicn clutch 22 is mad~ to slid~ in axi~l direction~ by 5 oscill~tion o~ a ~hift fork 23 supported by the au~iliar~y transmission ca~e 15 oscillatabl;y about a tranE~Ver3~ ~1Xi8~ The shift fork 23 i8 o~cillated by vertical oscilla~ion o~ an o~cillatable arm 24 fixsa to a portion of the fork 23 pro jecting from ~h~
au~iliar;lr tIa~sm~ ~io~ case 15~ and the arm 24 1~
vertically o~cillated b~ ~ vertical movament of a clutch operating lever 25.
The ~uxiliary transmission cas~ 15 is connected with the brake mechanism 1~! which is ~dapted to apply 15 a braking action to the second power talceo~f shaft 14.
Thi~ brake mecha~i~m 12 is sn interIlall~ actirLg typc comprisin~3 a drum 12a :Eixed to the second power takeoff shaft 14 and a p~ir of braki~g member~ 12b, 12b to pres~ against an inner p~riphery of the drum 12a~
~ach of the braking member~ 12b, 12b is oscillatabl~
supported at on3~end thereof by a support rod 26 ~i~ed .. ~ to a brake case~and is pre~sed at the other end by a J~,~ 3 cam ~haft 26 rotatably suppoxted by the brak~ case~.
~'4 The cam ~haft 2~ ha~ an end portion outsi~ the brake case securely connect~d to an oscillatable arm Z7 which is operatively connected to the brake operating lever 11 through a rod 28. ~he lever 11 is vertically oscillatably pivoted a~d adapted to be locked in a desired position by ~ ratchet mechanism 29 compri~ing a ratchet pawl 29a ~rld a lock receiving member 29b.
5 The ratchet pawl 2~a i~ oscillatable by a press elem~nt 30 provide~ at an upper end o~ a grip portion o:E the lever 11,.
The brake mechanism 12 assumes an operative position to appl~ a braking aetion to the rear wheel~
10 7s 7 and to the front wheel~ too if th~ latter are in a state of drivi~g, when the lelrer 11 is pulled up and an ~noperative position whe~ the lev0r 11 i~ broughll;
down .
Number 31 denotes a slide gea:r splined to the 15 drive pinion ~ha:ft; 4a,. A tran~missîon shaft 32 receives output ~rom the front transmi~ion case! 3 in which the drive has been subjected to a speed change, and an output of the shaft 32 i~ transmitted by the gear 313, in two speeds to the drive pinioIl ~haft 4a. Number 20 denotes a transmission case interposed betw~e~ a case ~3 ~4 housing a differential mechanism (not shown) for the front wheel~ 6, 6 and tha auxiliary tran3mission ca~e 15.
Fig. 6 shows a rnode of use wherein the brake 25 mechanism 12 has been removed from the auxiliary transmission case 15 an~ a universal join~ is conn~cted to the second power takeoff shaft 14. ~his arrange-ment enables various wor~ing i~plements such as a sower and a planter to be driven by a drive shaft 36 connect0d to the universal joint 35. In this instance, since the second pow~r takeof~ sha~t 14 is drive~ in association with the rear whe~l drive, a sowing or planting operation conveniently stop~ as the tractor stop~ travelling.
Though not ~hown in the drawings, the ~irst power takeoff shaft 13 and the front wheel drive mechanism 33 ma~ be disconnected and the universa:l joint 35 and the drive shaft may be connec~ed to the first power takeoff shaft 13 whereby the first power takeo~f sha~t 13 is ussd to drive various working implements such as a lawn mower and a rotar~ plow.
In this ca~e, since the first power takeoff ~ha~t 13 is provided with the transmission clutch 22~ such a working implement may be stopped temporarily while the tractor i8 travelling to thereby facilitate direct;ional changes and the like during a plowing operation. lf a working implement is suited for operation irrespective of travelling of the tractor such as when the tractor is standing still, then the implement ma~ be operatively connected to the third power takeoff shaft 17.
Claims (4)
EXCLUSIVE PROPERTY OR PRIVILEGE ARE CLAIMED ARE DEFINED
AS FOLLOWS:
1. A tractor having a power takeoff mechanism, comprising:
a rear wheel drive transmission case housing a differential mechanism for rear wheels;
an auxiliary transmission case attached to a bottom portion of said rear wheel drive transmission case;
a first power takeoff shaft supported by said auxiliary transmission case;
a gear mounted on said first power takeoff shaft and adapted to receive torque from said differential mechanism for rear wheels and to rotate in association with rotation of said rear wheels;
a transmission clutch disposed in said auxiliary transmission case to connect and disconnect an interlock between said first power takeoff shaft and said gear;
a second power takeoff shaft supported by said auxiliary transmission case; and a further gear fixed to said second power takeoff shaft and operatively connected with said gear.
a rear wheel drive transmission case housing a differential mechanism for rear wheels;
an auxiliary transmission case attached to a bottom portion of said rear wheel drive transmission case;
a first power takeoff shaft supported by said auxiliary transmission case;
a gear mounted on said first power takeoff shaft and adapted to receive torque from said differential mechanism for rear wheels and to rotate in association with rotation of said rear wheels;
a transmission clutch disposed in said auxiliary transmission case to connect and disconnect an interlock between said first power takeoff shaft and said gear;
a second power takeoff shaft supported by said auxiliary transmission case; and a further gear fixed to said second power takeoff shaft and operatively connected with said gear.
2. A tractor as claimed in Claim 1 having a front wheel drive mechanism, and further comprising a brake mechanism attached to said auxiliary transmission case to apply a braking action to said second power takeoff shaft, wherein said first power takeoff shaft is operatively connected to said front wheel drive mechanism.
3. A tractor as claimed in Claim 1 further comprising a brake mechanism disposed inside said auxiliary transmission case.
4. A tractor as claimed in any one of Claims 1 to 3, further comprising an intermediate gear disposed in said auxiliary transmission case and freely rotatably mounted on a support shaft in mesh with said gear on said first power takeoff shaft and said gear on said second power takeoff shaft.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57203/1979 | 1979-05-09 | ||
| JP5720379A JPS55148621A (en) | 1979-05-09 | 1979-05-09 | Power extractor for tractor |
| JP62090/1979 | 1979-05-10 | ||
| JP6209079U JPS55161745U (en) | 1979-05-10 | 1979-05-10 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1115990A true CA1115990A (en) | 1982-01-12 |
Family
ID=26398218
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA350,838A Expired CA1115990A (en) | 1979-05-09 | 1980-04-29 | Tractor having a power takeoff mechanism |
Country Status (2)
| Country | Link |
|---|---|
| CA (1) | CA1115990A (en) |
| DE (1) | DE3017506A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8037776B2 (en) | 2006-10-24 | 2011-10-18 | Zf Friedrichshafen Ag | Gear brake device for a multi-speed manual transmission |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60103022U (en) * | 1983-12-20 | 1985-07-13 | 株式会社クボタ | transmission for tractors |
| GB8623857D0 (en) * | 1986-10-03 | 1986-11-05 | Massey Ferguson Services Nv | Power take-off drive unit |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE733134C (en) * | 1940-04-06 | 1943-03-19 | Henschel & Sohn G M B H | Group transmission for motor vehicles |
| DE1044635B (en) * | 1957-07-17 | 1958-11-20 | Porsche Kg | Speed change gear for a tractor |
| DE1094110B (en) * | 1959-02-18 | 1960-12-01 | Zahnradfabrik Friedrichshafen | Device for braking the drive shaft for motor vehicle change-speed transmissions, in particular for tractor transmissions |
| DE1875867U (en) * | 1963-04-17 | 1963-07-18 | Porsche Diesel Motorenbau G M | CHANGE-OVER BRAKE FOR MOTOR VEHICLE TRANSMISSIONS IN PARTICULAR FOR TRACTOR GEAR. |
| US4141424A (en) * | 1976-09-28 | 1979-02-27 | Kubota Ltd. | Transmission for tractors |
-
1980
- 1980-04-29 CA CA350,838A patent/CA1115990A/en not_active Expired
- 1980-05-07 DE DE19803017506 patent/DE3017506A1/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8037776B2 (en) | 2006-10-24 | 2011-10-18 | Zf Friedrichshafen Ag | Gear brake device for a multi-speed manual transmission |
Also Published As
| Publication number | Publication date |
|---|---|
| DE3017506A1 (en) | 1980-11-13 |
| DE3017506C2 (en) | 1987-10-15 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |