CA1101694A - Transmission for a frameless tractor - Google Patents
Transmission for a frameless tractorInfo
- Publication number
- CA1101694A CA1101694A CA309,049A CA309049A CA1101694A CA 1101694 A CA1101694 A CA 1101694A CA 309049 A CA309049 A CA 309049A CA 1101694 A CA1101694 A CA 1101694A
- Authority
- CA
- Canada
- Prior art keywords
- shaft
- transmission
- change gear
- gear mechanism
- housing
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H37/00—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00
- F16H37/02—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00 comprising essentially only toothed or friction gearings
- F16H37/04—Combinations of toothed gearings only
- F16H37/042—Combinations of toothed gearings only change gear transmissions in group arrangement
-
- 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
- B60K17/04—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing
- B60K17/06—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing of change-speed gearing
- B60K17/08—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing of change-speed gearing of mechanical type
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D49/00—Tractors
- B62D49/06—Tractors adapted for multi-purpose use
- B62D49/0664—Light, simple, and economical tractors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/02—Gearboxes; Mounting gearing therein
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/02—Gearboxes; Mounting gearing therein
- F16H2057/02039—Gearboxes for particular applications
- F16H2057/02043—Gearboxes for particular applications for vehicle transmissions
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/02—Gearboxes; Mounting gearing therein
- F16H2057/02039—Gearboxes for particular applications
- F16H2057/02043—Gearboxes for particular applications for vehicle transmissions
- F16H2057/02056—Gearboxes for particular applications for vehicle transmissions for utility vehicles, e.g. tractors or agricultural machines
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/02—Gearboxes; Mounting gearing therein
- F16H57/021—Shaft support structures, e.g. partition walls, bearing eyes, casing walls or covers with bearings
- F16H2057/0213—Support of worm gear shafts
Abstract
ABSTRACT OF THE DISCLOSURE
A change speed transmission for a frameless tractor is disclosed. The transmission includes a housing having a first change gear mechanism which is capable of providing a number of speed ratio changes in one direction only.
A second change gear mechanism is provided which includes a reversing mechanism as well as possibly additional speed ratio changes. The transmission housing is so designed that the basic second change gear mechanism can be removed and another change gear mechanism substituted.
A change speed transmission for a frameless tractor is disclosed. The transmission includes a housing having a first change gear mechanism which is capable of providing a number of speed ratio changes in one direction only.
A second change gear mechanism is provided which includes a reversing mechanism as well as possibly additional speed ratio changes. The transmission housing is so designed that the basic second change gear mechanism can be removed and another change gear mechanism substituted.
Description
6S~L
TRANSMISSION FOR A FRAMELESS TR~CTOR
Technical Field The present invention relates generally to change speed transmissions and more particularly to a change speed transmission for a frameless tractor of the type wherein the transmission housing is a structural component of the tractor.
Background Art It has long been recognized that differing trans-missions may be desired by the customer's of self-propelled equipment. Thus, one customer may want a transmission having only a few differing speed ra-tios while another may want a large number of speed ratios. In the truck industry this has been accomplished by offering a basic transmission including a housing to wilich additional -transmission housings may be added. In the tractor industry this is generally not practical as most tractors are of the frame-less type wherein the transmission housing, engine block and rear or center housing form structural components of the tractor. Therefore, in the tractor trade it has been common to factory install various change gear mechanisms within a standard housing. As most tractors are built for inventory it is necessary to accurately predic-t the custom-ers requirement when building thèse tractors :if an exces-sive inventory of one form of tractor transmission is tobe avoided.
In U.S. Patent 3,382,735 issued 14 May, 1968, a transmission housing having a basic change gear transmission including a forward/reverse mechanlsm is disclosed, which transmission is suitable for farm use.
The transmission housing is so designed that a torque converter and hydraulically operated forward/reverse mechanism can be added to modify the transmission to make the transmission suitable for light industrial use.
Disclosure of Invention The present invention relates to a transmission of the type shown in the aforementioned patent having improved features. Thus, it is an object of the present invention to provide a transmission having a housing, a first change gear mechanism included within the housing and capable of providing a number of speed ratio changes in one direction only, a support member carried by the transmission housing, and a second change gear mechanism which includes a reversing mechanism as well as possibly additional speed ratio changes. By providing the foregoing structure it is possible to provide a less complicated first change gear mechanism than that illustrated in the aforementioned patent as the first change gear mechanism does not necessarily have to include a forward/reverse gear mechanism as this is always incorporated in a second change gear mechanism. In the basic form of transmission, that is one without addi-tional speed ratios than that provided by the basic transmission, the second change gear mechanism which is supported by the support member will include a forward/reverse mechanism having a shiftable coupler and a shift rail which can be connected to the shifting mechanism.
The transmission housing is so designed that the basic second change gear mechanism can be removed by a tractor dealer and another change gear`mechanism can be substituted therefc~re. Thus, it is a feature of the inven-tion to provide a transmission housing including a secondchange gear mechanism including a forward/reverse mechanism which can readily be instal~ed or removed from a .'~ 6~ -transmission housing.
Thus, in accordance with the present teachings, a transmission for a frameless tractor is provided. The transmission extends between the drive and driven member and comprises a first change gear mechanism which includes first and second parallel shafts, one of which is coupled to the drive member, a housing is provided for the first change gear mechanism with the housing having generally longitudinally extending sidewalls which are adapted to encompass the first gear change mechanism and an inwardly extending annular flange carried by the sidewall~ A
support member is provided removably secured to the annular flange and rotatably supporting the forward portion of the first shaft. A second change gear mechanism is provided carried by the support member and includes a third shaft supported in coaxial alignment with the first shaft, the third shaft is interconnected with the drive member, and a forward/reverse mechanism including a longitudinally movable shiftable coupler on the third shaft.
In the following description two second change gear mechanisms will be disclosed in combination with a first change gear mechanism. However, it should be obvious that other change gear mechanisms could be utilized in this transmission.
..
. : , . .
,~
. . .
-, . ""~
; ~ ! ,, Brief Description o Drawinc3s Figure 1 is a side view of a frameless tractor in which the principles of the present invention are incorporated.
Figure 2 is a sectional view of one transmission op-tion.
Figure 3 is an enlarged view of a portion of the transmission shown in Figure 2.
Flgure 4 is a section taken generally alony the line 4-4 in Figure 3.
Figure 5 is a section taken generally along the line 5-5 in Figure 4.
Figure 6 is a view similar to Figure 3 showing a second transmission option.
Detailed Description Referring first to Figure 1, a Erameless tractor is illustra-ted, the tractor being indicated generally at 10 and including an engine 12, a transmission indicated generally at 14, the transmission including a housing 16, a rear or center housing 18, and an axle housing 20.
Front and rear wheels 22,24 are mounted on the tractor in a conventional manner. As can be seen from Fig. 1 the engine 12, transmission housing 16 and center housing 20 25- form structural support members for the tractor and there-fore this type of tractor is generally referred to as a frameless tractor.
In accordance with the principles of this inven-tion first and second change gear mechanisms, indicated 30 generally at 26 and 28, (Fig. 2) are coupled to each other within the transmission housing. The first change gear mechanism as illustrated is of a type giving eight differ-ing speed ratios between the input side and the output shaft. The second change gear mechanism is of a type including a forward/reverse mechanism, and ;t may include additional speed ratios. Thus, in the embodiment , D-5296 ~ 4 illustrated ln Fi~ure 2 the second change gear mecha]lism includes a forward/reverse mechanism as well as mechani.sm for providin~ two additional speed ratios to the input of the first change gear mechanism 26, thereby providing a transmission having 16 speeds. Differing second change gear mechanisms may be employed and a second version is illustrated in Fig. 6. In order to provide for the sub-stitution of one change gear mechanism for another it has been neces,sary to design the first and second change gear mechanisms and the housing in a special manner.
To this end the first change'gear mechanism 26 is provided with a first hollow shaft 30 and a second two piece shaft 34, the rear end of the Eirst shaft 30 being rotatably journaled in the rear end wall 32 of the housing 16, and the rear end of the second shaft assembly 34 being rotatably journaled in a bearing plate 35 whlch is in turn carried by the rear wall 32. A plurality of intermeshing gear sets 36 are carried by the first and second shafts 30,34 and are selec-tively interconnectable to transmit power from one shaft to the other. One manner in which the gears 36 may be mounted on the shafts 30,34 is illu-strated in my earlier U.K. Patent 1,391,854. The second shaft assembly 34 is divided into forward and rear por-tions 38,40, respectively, the forward end of the rear portion 40 being journaled by bearings 42 carried within a cylindrical recess on the rear end of the forward portion 38. The forward portion 38 may be referred to as a counter shaft, and the rear portion 40 as an output shaft. The output shaft 40 is coupled to a driven member (not shown). The forward end of the counter shaft 38 is carried by a bearing 44 which is in turn supported by a first flange 46 which extends inwardly from the generally cylindrical side walls 48 oE the housing 16. An addi-tional flange 50 is provided between the Ei,rst flange ~6 and the rear wall 32, the addi,tional flange 50 carryin~) a further bearing 52 which rotatably supports a rear portion D-5296 ~ 69~
of the counter shaft 38.
In order to removably mount a second change gear mechanism within the housing, the housing 16 is provided with an inwardly extending annular flange 54. A support member indicated generally at 56 is removably secured to the second f]ange 54. In the embodiment illustrated in Figs. 2 and 3 the support member 56 is formed of two parts which shall be referred to as the front cover 58 and the support frame 60. The front cover 58 is pro~;ded with a radially outwardly extending circular flange 62 which is secured to the annular flange 54 by bolts 64 or the like.
The support frame 60 has a radius less than that of the annular support flange 54 and is secured to the front cover 58 by cap screws 66. The front cover and support frame 58,60 cooperate with the rear wall 32 to form a fluid reservoir within the housing 16. In addition, the support frame 60, which is rigidly mounted within the housing, is utilized to support the forward end of the main shaft 30.
To this end, a bearing support 68 which carries a bearing 70 is secured in place by bolts 72. The forward end of the first shaft 30 is journaled within the bearing 70.
The support frame 60 carries additional bearings 74 and 76 in which is journaled a hollow third shaft 78.
Rotatably mounted on the third shaft are spaced apart forward and reverse gears 80,82. A shiftable coupler 84 is keyed to the shaft 78 and may be shifted axially of the shaft to drivingly interconnect either the forward gear 80 with the shaft 7B or the reverse gear 82 with -the shaft 78. The coupler is caused to be shifted by a shift rail 83 and fork 85. The shift rail is carried by the suppor-t member 56 for axial sliding movement. The gear 80 is at all times in constant mesh with a gear 86 carried by the forward end of the counter shaft 38. The support member 56 additionally carries a stuh shaft 88 (~iqs. 4 and 5) upon which is moun-ted a reverse idler 90 having a first toothed portion 92 which is constantly in mesh with the 6~4 D-52C~6 teeth on gear 82, and a second toothed portion 94 which is constantly in mesh with the teeth on gear 86.
Mounted forwardly of the forward/reverse gear mechanism is a 2-speed planetary gear set indica~ed generally at 96, which gear set along with the orward/
reverse mechanism completes the second change gear mecha-nism 26. The planetary gear set includes a hollow input shaft 98 the forward end of which is coupled to a drive member such as a tractor clutch plate (not shown). The rear end of the input shaft 98 is supported hy a bearing 100 disposed within an aperture of the clutch release bearing carrier 102 which is in turn secured to the front cover 58 by fasteners 104. A ring gear 106 is secured -to the input shaft 98 by bolts 108. A hydraulically operated clutch pack 110 may be utilized to couple the ring gear 106 to a planet carrier 112. Thus, when fluid is intro-duced into the chamber 114 behind the pis-ton 116, the clutch pack 110 will be engaged thereby locking the planet carrier 112 to the ring gear 106. The planet carrier is provided with a plurality of axial.ly extending stub shafts 118 on which are mounted planet gears 120. The teeth 122 on the ring gear 106 and the teeth 124 on a sun gear 126 are in constant mesh with the tee-th on the planet gears 120. The planet carrier 112 is coupled directly to the third shaft 78 upon which the forward/reverse gear mecha-nism is mounted, and the sun gear 126 is journaled for rotation about the shaft 78. A c].utch disc 128 is secured.
to the sun gear, which clutch disc may be utilized to hold the sun gear from rotation. To this end compression springs 130 are disposed in suitable recesses in the front cover 58, the springs 130 acting against a pressure plate 132 to normally bias the clutch disc 128 into engagement with a flat surface on the support frame 60. The clutch disc 128 may be disengaged by introduci.ng .Eluid under pressure into chamber 134 to cause piston :L36 to enc~age the pressure plate 132 and move the plate 132 away Erom the clutch disc 128 and flat surace. The fluid circuit ~or operating the planetary gear set 96 is illustrated somewhat schematically in Fig. 2 and includes a pump 138, 1uid reservoir 140, valve 142, and manual control lever 144.
When the valve is in the position il]ustrated in Fig. 2 fluid from the pump 138 will be returned directly to the reservoir through line 146. In this position the springs 130 will hold the clutch disc 128 against the flat surface of the housing 60. When the manual control lever 144 is shifted to its other position (not illus-trated) ~luid from the pump 138 will be introduced into line 148 and thence into chambers 114 and 134 to cause the piston 136 to disen-gage the pressure plate 132 and piston 116 to engage the hydraulically operated clutch pack 110. The preload of springs 130 is so designed that when fluid is introduced into the chambers 134 and 114 -the hydraulically operated clutch pack 110 will be partially engaged prior to the full disengagement of the first clutch 128. In the event that the clu-tch 128 became disengaged before the clutch 110 became engaged it would be possible for power flow to be interrupted from the shaft 98 -to the shaft 78. By employing springs 130 having a certain preload charac-teristic it is possible to inSIIre continuous power flow as the planetary gear set is being shifted from its high speed ratio when clutch 128 is engaged -to its low speed ratio when clutch pack 110 is engaged, and vice versa.
In the embodiment shown in Figures 2 through 5 the transmission 14 has 16-speed ratios. In the embodiment illustrated in Fig. 6, which will now be described, the
TRANSMISSION FOR A FRAMELESS TR~CTOR
Technical Field The present invention relates generally to change speed transmissions and more particularly to a change speed transmission for a frameless tractor of the type wherein the transmission housing is a structural component of the tractor.
Background Art It has long been recognized that differing trans-missions may be desired by the customer's of self-propelled equipment. Thus, one customer may want a transmission having only a few differing speed ra-tios while another may want a large number of speed ratios. In the truck industry this has been accomplished by offering a basic transmission including a housing to wilich additional -transmission housings may be added. In the tractor industry this is generally not practical as most tractors are of the frame-less type wherein the transmission housing, engine block and rear or center housing form structural components of the tractor. Therefore, in the tractor trade it has been common to factory install various change gear mechanisms within a standard housing. As most tractors are built for inventory it is necessary to accurately predic-t the custom-ers requirement when building thèse tractors :if an exces-sive inventory of one form of tractor transmission is tobe avoided.
In U.S. Patent 3,382,735 issued 14 May, 1968, a transmission housing having a basic change gear transmission including a forward/reverse mechanlsm is disclosed, which transmission is suitable for farm use.
The transmission housing is so designed that a torque converter and hydraulically operated forward/reverse mechanism can be added to modify the transmission to make the transmission suitable for light industrial use.
Disclosure of Invention The present invention relates to a transmission of the type shown in the aforementioned patent having improved features. Thus, it is an object of the present invention to provide a transmission having a housing, a first change gear mechanism included within the housing and capable of providing a number of speed ratio changes in one direction only, a support member carried by the transmission housing, and a second change gear mechanism which includes a reversing mechanism as well as possibly additional speed ratio changes. By providing the foregoing structure it is possible to provide a less complicated first change gear mechanism than that illustrated in the aforementioned patent as the first change gear mechanism does not necessarily have to include a forward/reverse gear mechanism as this is always incorporated in a second change gear mechanism. In the basic form of transmission, that is one without addi-tional speed ratios than that provided by the basic transmission, the second change gear mechanism which is supported by the support member will include a forward/reverse mechanism having a shiftable coupler and a shift rail which can be connected to the shifting mechanism.
The transmission housing is so designed that the basic second change gear mechanism can be removed by a tractor dealer and another change gear`mechanism can be substituted therefc~re. Thus, it is a feature of the inven-tion to provide a transmission housing including a secondchange gear mechanism including a forward/reverse mechanism which can readily be instal~ed or removed from a .'~ 6~ -transmission housing.
Thus, in accordance with the present teachings, a transmission for a frameless tractor is provided. The transmission extends between the drive and driven member and comprises a first change gear mechanism which includes first and second parallel shafts, one of which is coupled to the drive member, a housing is provided for the first change gear mechanism with the housing having generally longitudinally extending sidewalls which are adapted to encompass the first gear change mechanism and an inwardly extending annular flange carried by the sidewall~ A
support member is provided removably secured to the annular flange and rotatably supporting the forward portion of the first shaft. A second change gear mechanism is provided carried by the support member and includes a third shaft supported in coaxial alignment with the first shaft, the third shaft is interconnected with the drive member, and a forward/reverse mechanism including a longitudinally movable shiftable coupler on the third shaft.
In the following description two second change gear mechanisms will be disclosed in combination with a first change gear mechanism. However, it should be obvious that other change gear mechanisms could be utilized in this transmission.
..
. : , . .
,~
. . .
-, . ""~
; ~ ! ,, Brief Description o Drawinc3s Figure 1 is a side view of a frameless tractor in which the principles of the present invention are incorporated.
Figure 2 is a sectional view of one transmission op-tion.
Figure 3 is an enlarged view of a portion of the transmission shown in Figure 2.
Flgure 4 is a section taken generally alony the line 4-4 in Figure 3.
Figure 5 is a section taken generally along the line 5-5 in Figure 4.
Figure 6 is a view similar to Figure 3 showing a second transmission option.
Detailed Description Referring first to Figure 1, a Erameless tractor is illustra-ted, the tractor being indicated generally at 10 and including an engine 12, a transmission indicated generally at 14, the transmission including a housing 16, a rear or center housing 18, and an axle housing 20.
Front and rear wheels 22,24 are mounted on the tractor in a conventional manner. As can be seen from Fig. 1 the engine 12, transmission housing 16 and center housing 20 25- form structural support members for the tractor and there-fore this type of tractor is generally referred to as a frameless tractor.
In accordance with the principles of this inven-tion first and second change gear mechanisms, indicated 30 generally at 26 and 28, (Fig. 2) are coupled to each other within the transmission housing. The first change gear mechanism as illustrated is of a type giving eight differ-ing speed ratios between the input side and the output shaft. The second change gear mechanism is of a type including a forward/reverse mechanism, and ;t may include additional speed ratios. Thus, in the embodiment , D-5296 ~ 4 illustrated ln Fi~ure 2 the second change gear mecha]lism includes a forward/reverse mechanism as well as mechani.sm for providin~ two additional speed ratios to the input of the first change gear mechanism 26, thereby providing a transmission having 16 speeds. Differing second change gear mechanisms may be employed and a second version is illustrated in Fig. 6. In order to provide for the sub-stitution of one change gear mechanism for another it has been neces,sary to design the first and second change gear mechanisms and the housing in a special manner.
To this end the first change'gear mechanism 26 is provided with a first hollow shaft 30 and a second two piece shaft 34, the rear end of the Eirst shaft 30 being rotatably journaled in the rear end wall 32 of the housing 16, and the rear end of the second shaft assembly 34 being rotatably journaled in a bearing plate 35 whlch is in turn carried by the rear wall 32. A plurality of intermeshing gear sets 36 are carried by the first and second shafts 30,34 and are selec-tively interconnectable to transmit power from one shaft to the other. One manner in which the gears 36 may be mounted on the shafts 30,34 is illu-strated in my earlier U.K. Patent 1,391,854. The second shaft assembly 34 is divided into forward and rear por-tions 38,40, respectively, the forward end of the rear portion 40 being journaled by bearings 42 carried within a cylindrical recess on the rear end of the forward portion 38. The forward portion 38 may be referred to as a counter shaft, and the rear portion 40 as an output shaft. The output shaft 40 is coupled to a driven member (not shown). The forward end of the counter shaft 38 is carried by a bearing 44 which is in turn supported by a first flange 46 which extends inwardly from the generally cylindrical side walls 48 oE the housing 16. An addi-tional flange 50 is provided between the Ei,rst flange ~6 and the rear wall 32, the addi,tional flange 50 carryin~) a further bearing 52 which rotatably supports a rear portion D-5296 ~ 69~
of the counter shaft 38.
In order to removably mount a second change gear mechanism within the housing, the housing 16 is provided with an inwardly extending annular flange 54. A support member indicated generally at 56 is removably secured to the second f]ange 54. In the embodiment illustrated in Figs. 2 and 3 the support member 56 is formed of two parts which shall be referred to as the front cover 58 and the support frame 60. The front cover 58 is pro~;ded with a radially outwardly extending circular flange 62 which is secured to the annular flange 54 by bolts 64 or the like.
The support frame 60 has a radius less than that of the annular support flange 54 and is secured to the front cover 58 by cap screws 66. The front cover and support frame 58,60 cooperate with the rear wall 32 to form a fluid reservoir within the housing 16. In addition, the support frame 60, which is rigidly mounted within the housing, is utilized to support the forward end of the main shaft 30.
To this end, a bearing support 68 which carries a bearing 70 is secured in place by bolts 72. The forward end of the first shaft 30 is journaled within the bearing 70.
The support frame 60 carries additional bearings 74 and 76 in which is journaled a hollow third shaft 78.
Rotatably mounted on the third shaft are spaced apart forward and reverse gears 80,82. A shiftable coupler 84 is keyed to the shaft 78 and may be shifted axially of the shaft to drivingly interconnect either the forward gear 80 with the shaft 7B or the reverse gear 82 with -the shaft 78. The coupler is caused to be shifted by a shift rail 83 and fork 85. The shift rail is carried by the suppor-t member 56 for axial sliding movement. The gear 80 is at all times in constant mesh with a gear 86 carried by the forward end of the counter shaft 38. The support member 56 additionally carries a stuh shaft 88 (~iqs. 4 and 5) upon which is moun-ted a reverse idler 90 having a first toothed portion 92 which is constantly in mesh with the 6~4 D-52C~6 teeth on gear 82, and a second toothed portion 94 which is constantly in mesh with the teeth on gear 86.
Mounted forwardly of the forward/reverse gear mechanism is a 2-speed planetary gear set indica~ed generally at 96, which gear set along with the orward/
reverse mechanism completes the second change gear mecha-nism 26. The planetary gear set includes a hollow input shaft 98 the forward end of which is coupled to a drive member such as a tractor clutch plate (not shown). The rear end of the input shaft 98 is supported hy a bearing 100 disposed within an aperture of the clutch release bearing carrier 102 which is in turn secured to the front cover 58 by fasteners 104. A ring gear 106 is secured -to the input shaft 98 by bolts 108. A hydraulically operated clutch pack 110 may be utilized to couple the ring gear 106 to a planet carrier 112. Thus, when fluid is intro-duced into the chamber 114 behind the pis-ton 116, the clutch pack 110 will be engaged thereby locking the planet carrier 112 to the ring gear 106. The planet carrier is provided with a plurality of axial.ly extending stub shafts 118 on which are mounted planet gears 120. The teeth 122 on the ring gear 106 and the teeth 124 on a sun gear 126 are in constant mesh with the tee-th on the planet gears 120. The planet carrier 112 is coupled directly to the third shaft 78 upon which the forward/reverse gear mecha-nism is mounted, and the sun gear 126 is journaled for rotation about the shaft 78. A c].utch disc 128 is secured.
to the sun gear, which clutch disc may be utilized to hold the sun gear from rotation. To this end compression springs 130 are disposed in suitable recesses in the front cover 58, the springs 130 acting against a pressure plate 132 to normally bias the clutch disc 128 into engagement with a flat surface on the support frame 60. The clutch disc 128 may be disengaged by introduci.ng .Eluid under pressure into chamber 134 to cause piston :L36 to enc~age the pressure plate 132 and move the plate 132 away Erom the clutch disc 128 and flat surace. The fluid circuit ~or operating the planetary gear set 96 is illustrated somewhat schematically in Fig. 2 and includes a pump 138, 1uid reservoir 140, valve 142, and manual control lever 144.
When the valve is in the position il]ustrated in Fig. 2 fluid from the pump 138 will be returned directly to the reservoir through line 146. In this position the springs 130 will hold the clutch disc 128 against the flat surface of the housing 60. When the manual control lever 144 is shifted to its other position (not illus-trated) ~luid from the pump 138 will be introduced into line 148 and thence into chambers 114 and 134 to cause the piston 136 to disen-gage the pressure plate 132 and piston 116 to engage the hydraulically operated clutch pack 110. The preload of springs 130 is so designed that when fluid is introduced into the chambers 134 and 114 -the hydraulically operated clutch pack 110 will be partially engaged prior to the full disengagement of the first clutch 128. In the event that the clu-tch 128 became disengaged before the clutch 110 became engaged it would be possible for power flow to be interrupted from the shaft 98 -to the shaft 78. By employing springs 130 having a certain preload charac-teristic it is possible to inSIIre continuous power flow as the planetary gear set is being shifted from its high speed ratio when clutch 128 is engaged -to its low speed ratio when clutch pack 110 is engaged, and vice versa.
In the embodiment shown in Figures 2 through 5 the transmission 14 has 16-speed ratios. In the embodiment illustrated in Fig. 6, which will now be described, the
2-speed planetary input portion of the second change gear mechanism is eliminated and therefore the transmission 14 is capable of only eight forward speeds. Before describing Fig. 6 in detail it should be observed that some of the components of the second change gear mechanism illustrated in Fig. 6 and indicated generally at 150 are identical to components illustrated in Figures 2 through 5, and these _g_ components will be indicated by -the same reference numer-als. In addition, while a first change gear mechanism is illustrated having 8-speeds, other first change gear mechanisms could be employed having a differiny number of speeds, such as 4, 6, etc..
The second change gear mechanism 150 of the type illustrated in Figure 6 includes a combined frGnt cover and support frame 152 provided with an annular flanye 154 which may be secu,red to the annular second f],ange 54 of the transmission housing 16 by bolts 64. A bearing 70 is carried by a rear portion of the support 152 and is secured in place by screws 156 and a bearing retainer 158. The forward end of the main shaft 30 is journaled within the bearing 70. An input shaft 160, whose forward end is coupled to a drive member such as a -tractor clutch, has its rear end coupled directly to the third shaft 78. The forward end of the hollow third shaft 78 is supported by a spacer 162 which is in turn supported by a bearing 164 carried by the support frame 152. The rear end of the shaft 78 is also supported by a bearing 166 carried by the support frame 152. A forward/reverse mechan,ism including forward and reverse gears 80,82 and coupler 84 are mounted about the shaft 78, the gear 80 being in constant mesh with gear 86 on the forward end of counter shaft 38 and the gear 82 being in constant mesh with a reverse idler 90.
A fork 85 engages the coupler 84 and is shifted by a shift rail (not shown) which is carried by the support frame 152.
By designing the transmission in the manner indi-cated above it is possible to utilize the same basic or first change gear mechanism 26 with a variety of second change gear mechanisms which may provide, ~or example, only a forward/reverse gear mechanism of the type illustrated at 150 in Fig. 6, a 2-speed orward/reverse rnechanism of the type illustrated at 28 in Figs. 2 t,hrough 5, or by o-ther input mechanisms such as, for example, a 3-speed forward/reverse mechanism of the type illustrated in \
U.K. Patent 1,399,373. The manner of converting a tractor from the 16-speed transmission of the type illustrated in Fig. 2 to the 8-speed transmission of the type illustrated in Fig. 6 will now be described.
It is first necessary to separate the trans-mission housing 16 from the engine 12 and to move these parts apart. To this end, it would be necessary to dis-connect all lines, controls, etc. which extend between the engine 12 and housing 16. After this has been done bolts 168 (Fig. 1) which secure the housing 16 to the engine must be removed to permit the front and rear halves of the tractor to be moved apart. The power takeoff shaft 170 which extends through the hollow shafts 98,78 and 30 is then removed. (The front end of the PTO shaft is connected to the engine flywheel by a spline.) After this has been done it is necessary to remove various lubrica-tions lines (not illustrated) and to then remove the clutch release bearing carrier 102, the saddle assembly 172, the clutch release lever 174, and the clutch cross shaft 176. As the shift rail 83 and fork 85 for the forward/reverse mechanism are carried by the front member 56 it is necessary that the shift cover 182 be removed from the right side of the transmission housing in order to disengage the reverse actuator 184 from the forward reverse saddle 186 carried at the rear end of the shift rail 83.
While the mechanism for operating the reverse actuator 184 is not illustrated it should be observed that the reverse actuator 184 may be carried at one end of a rock arm, the other end of which is connected to a rock shaft which may be rotatably mounted in the shift cover 182. The shift column and controls for the other shift rails 188, as well as the mechanism for opexating the reverse actuator 184, may be of the type illustrated in U.S. Patent 3,975,970.
When the assembly 28 is beiny removed it is essential that it be pulled out axially approximately two inches to cause the front ends of shift rails 188 and the rear end of the lubrication tube 190 to be disconnected from their , 6~
associated recesses. The assembly is now rota-ted coun-ter-clockwise approxi.mately 1/8 of a turn and is then pulled from the transmission housing 16. To install the assembly 150 in the housing 16 the procedure outlined above is followed in reverse order.
The second change gear mechanism 150 of the type illustrated in Figure 6 includes a combined frGnt cover and support frame 152 provided with an annular flanye 154 which may be secu,red to the annular second f],ange 54 of the transmission housing 16 by bolts 64. A bearing 70 is carried by a rear portion of the support 152 and is secured in place by screws 156 and a bearing retainer 158. The forward end of the main shaft 30 is journaled within the bearing 70. An input shaft 160, whose forward end is coupled to a drive member such as a -tractor clutch, has its rear end coupled directly to the third shaft 78. The forward end of the hollow third shaft 78 is supported by a spacer 162 which is in turn supported by a bearing 164 carried by the support frame 152. The rear end of the shaft 78 is also supported by a bearing 166 carried by the support frame 152. A forward/reverse mechan,ism including forward and reverse gears 80,82 and coupler 84 are mounted about the shaft 78, the gear 80 being in constant mesh with gear 86 on the forward end of counter shaft 38 and the gear 82 being in constant mesh with a reverse idler 90.
A fork 85 engages the coupler 84 and is shifted by a shift rail (not shown) which is carried by the support frame 152.
By designing the transmission in the manner indi-cated above it is possible to utilize the same basic or first change gear mechanism 26 with a variety of second change gear mechanisms which may provide, ~or example, only a forward/reverse gear mechanism of the type illustrated at 150 in Fig. 6, a 2-speed orward/reverse rnechanism of the type illustrated at 28 in Figs. 2 t,hrough 5, or by o-ther input mechanisms such as, for example, a 3-speed forward/reverse mechanism of the type illustrated in \
U.K. Patent 1,399,373. The manner of converting a tractor from the 16-speed transmission of the type illustrated in Fig. 2 to the 8-speed transmission of the type illustrated in Fig. 6 will now be described.
It is first necessary to separate the trans-mission housing 16 from the engine 12 and to move these parts apart. To this end, it would be necessary to dis-connect all lines, controls, etc. which extend between the engine 12 and housing 16. After this has been done bolts 168 (Fig. 1) which secure the housing 16 to the engine must be removed to permit the front and rear halves of the tractor to be moved apart. The power takeoff shaft 170 which extends through the hollow shafts 98,78 and 30 is then removed. (The front end of the PTO shaft is connected to the engine flywheel by a spline.) After this has been done it is necessary to remove various lubrica-tions lines (not illustrated) and to then remove the clutch release bearing carrier 102, the saddle assembly 172, the clutch release lever 174, and the clutch cross shaft 176. As the shift rail 83 and fork 85 for the forward/reverse mechanism are carried by the front member 56 it is necessary that the shift cover 182 be removed from the right side of the transmission housing in order to disengage the reverse actuator 184 from the forward reverse saddle 186 carried at the rear end of the shift rail 83.
While the mechanism for operating the reverse actuator 184 is not illustrated it should be observed that the reverse actuator 184 may be carried at one end of a rock arm, the other end of which is connected to a rock shaft which may be rotatably mounted in the shift cover 182. The shift column and controls for the other shift rails 188, as well as the mechanism for opexating the reverse actuator 184, may be of the type illustrated in U.S. Patent 3,975,970.
When the assembly 28 is beiny removed it is essential that it be pulled out axially approximately two inches to cause the front ends of shift rails 188 and the rear end of the lubrication tube 190 to be disconnected from their , 6~
associated recesses. The assembly is now rota-ted coun-ter-clockwise approxi.mately 1/8 of a turn and is then pulled from the transmission housing 16. To install the assembly 150 in the housing 16 the procedure outlined above is followed in reverse order.
Claims (9)
1. A transmission for a frameless tractor, the transmission extending between drive and driven member and comprising:
a first change gear mechanism including first and second parallel shafts, one of which is coupled to a driven member;
a housing for the first change gear mechanism, said housing having generally longitudinally extending side walls which are adapted to encompass the first change gear mechanism, and an inwardly extending annular flange carried by the side walls;
a support member removably secured to the annular flange and rotatably supporting the forward portion of the first shaft; and a second change gear mechanism carried by the support member and including a third shaft supported in coaxial align-ment with the first shaft, the third shaft being interconnected with a drive member, and a forward/reverse mechanism including a longitudinally movable shiftable coupler on the third shaft.
a first change gear mechanism including first and second parallel shafts, one of which is coupled to a driven member;
a housing for the first change gear mechanism, said housing having generally longitudinally extending side walls which are adapted to encompass the first change gear mechanism, and an inwardly extending annular flange carried by the side walls;
a support member removably secured to the annular flange and rotatably supporting the forward portion of the first shaft; and a second change gear mechanism carried by the support member and including a third shaft supported in coaxial align-ment with the first shaft, the third shaft being interconnected with a drive member, and a forward/reverse mechanism including a longitudinally movable shiftable coupler on the third shaft.
2. The transmission as set forth in claim 1 further including a shifting mechanism, and wherein the second change gear mechanism further includes a shift rail connectable to the shifting mechanism.
3. The transmission as set forth in claim 2 wherein the shifting mechanism is disposed to one side of the first change gear mechanism.
4. The transmission as set forth in claim 2 wherein the second shaft is divisible into forward and rear independently rotatable shaft portions, and wherein intermeshing gear sets are supported by the first shaft and by both the forward and rear portions of the second shaft, and wherein the first change gear mechanism further includes shift rails generally parallel to the shift rail for the second change gear mechanism.
5. The transmission as set forth in claim 1 wherein the housing further includes a rear end wall rotatably supporting rear end portions of the first and second shafts, and a flange disposed between the annular flange and the rear end wall for rotatably supporting a forward portion of the second shaft.
6. The transmission as set forth in claim 5 wherein the support member cooperates with the rear wall to form a fluid reservoir.
7. The transmission as set forth in claim 1 wherein the forward/reverse mechanism drives a gear mounted on the forward end of the second shaft.
8. The transmission as set forth in claim 7 wherein the housing further includes a flange carried by a side wall for rotatably supporting a forward portion of the second shaft.
9. The transmission for a frameless tractor, the transmission extending between drive and driven members and comprising:
a first change gear mechanism including first and second parallel shafts, one of which is coupled into a driven member, and a plurality of intermeshing gear sets carried by the first and second shafts and selectively operable to transmit power from one shaft to the other;
a housing for the first change gear mechanism, which housing also serves as a tractor structural support member, said housing having generally longitudinally extending side walls which are adapted to encompass the first change gear mechanism, a rear end wall rotatably supporting rear end portions of the first and second shafts, a first flange carried by a side wall for rotatably supporting a forward portion of the second shaft, and an inwardly extending annular second flange carried by the side walls and disposed forwardly of the first flange;
a support member removably secured to the annular second flange and cooperating with the rear wall to form a fluid reservoir, said support member rotatably supporting the forward portion of the first shaft; and a second change gear mechanism carried by the support member and including a third shaft supported in coaxial alignment with the first shaft, the third shaft being interconnected with a drive member, a forward/reverse mechanism including a longitudinally movable shiftable coupler on the third shaft, and a shift rail and fork interconnected with the longitudinally movable coupler and inter-connectable with a shiftable mechanism disposed to one side of the first change gear mechanism.
a first change gear mechanism including first and second parallel shafts, one of which is coupled into a driven member, and a plurality of intermeshing gear sets carried by the first and second shafts and selectively operable to transmit power from one shaft to the other;
a housing for the first change gear mechanism, which housing also serves as a tractor structural support member, said housing having generally longitudinally extending side walls which are adapted to encompass the first change gear mechanism, a rear end wall rotatably supporting rear end portions of the first and second shafts, a first flange carried by a side wall for rotatably supporting a forward portion of the second shaft, and an inwardly extending annular second flange carried by the side walls and disposed forwardly of the first flange;
a support member removably secured to the annular second flange and cooperating with the rear wall to form a fluid reservoir, said support member rotatably supporting the forward portion of the first shaft; and a second change gear mechanism carried by the support member and including a third shaft supported in coaxial alignment with the first shaft, the third shaft being interconnected with a drive member, a forward/reverse mechanism including a longitudinally movable shiftable coupler on the third shaft, and a shift rail and fork interconnected with the longitudinally movable coupler and inter-connectable with a shiftable mechanism disposed to one side of the first change gear mechanism.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB23949/78 | 1978-05-30 | ||
| GB2394978A GB1605068A (en) | 1978-05-30 | 1978-05-30 | Transmission for a frameless tractor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1101694A true CA1101694A (en) | 1981-05-26 |
Family
ID=10203939
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA309,049A Expired CA1101694A (en) | 1978-05-30 | 1978-08-10 | Transmission for a frameless tractor |
Country Status (5)
| Country | Link |
|---|---|
| AR (1) | AR221878A1 (en) |
| CA (1) | CA1101694A (en) |
| ES (1) | ES243647Y (en) |
| FR (1) | FR2427216A1 (en) |
| GB (1) | GB1605068A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6722464B2 (en) * | 2001-03-29 | 2004-04-20 | Kubota Corporation | Working vehicle |
| DE102010029597A1 (en) | 2010-06-01 | 2011-12-01 | Deere & Company | transmission assembly |
| DE102012210635A1 (en) * | 2012-06-22 | 2013-12-24 | Deere & Company | Transmission clutch unit |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3382732A (en) * | 1965-02-03 | 1968-05-14 | Gen Motors Corp | Control mechanism |
| US4041791A (en) * | 1975-10-14 | 1977-08-16 | Borg-Warner Corporation | Method of manufacturing a transmission |
| US4141424A (en) * | 1976-09-28 | 1979-02-27 | Kubota Ltd. | Transmission for tractors |
-
1978
- 1978-05-30 GB GB2394978A patent/GB1605068A/en not_active Expired
- 1978-08-10 CA CA309,049A patent/CA1101694A/en not_active Expired
-
1979
- 1979-05-29 FR FR7913573A patent/FR2427216A1/en active Granted
- 1979-05-30 ES ES1979243647U patent/ES243647Y/en not_active Expired
- 1979-05-30 AR AR27672879A patent/AR221878A1/en active
Also Published As
| Publication number | Publication date |
|---|---|
| FR2427216A1 (en) | 1979-12-28 |
| FR2427216B1 (en) | 1984-11-23 |
| AR221878A1 (en) | 1981-03-31 |
| ES243647U (en) | 1980-02-16 |
| GB1605068A (en) | 1981-12-16 |
| ES243647Y (en) | 1980-07-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4000662A (en) | Multiple input transmission | |
| CA1302736C (en) | Countershaft transmission | |
| US4615240A (en) | Gear arrangement for a motor vehicle | |
| US4976670A (en) | Power transmission | |
| US3916714A (en) | Transmissions | |
| US4282775A (en) | Transmission having a two-speed planetary gear set | |
| US3893345A (en) | Transmissions | |
| GB2103317A (en) | Spur change-speed gear unit with concentric input shafts drivable through double clutch | |
| US3837237A (en) | Multi-speed change-speed transmissions for motor vehicles | |
| US4245519A (en) | Multispeed reversible transmission shiftable under load | |
| US4858495A (en) | Multi-speed powershift transmission | |
| US20040220009A1 (en) | Transfer case with overdrive/underdrive shifting | |
| US4627301A (en) | Change speed transmission | |
| JPS63145847A (en) | Automatic transmission | |
| CA1101694A (en) | Transmission for a frameless tractor | |
| US4267741A (en) | Vehicle gearbox | |
| EP1599684B1 (en) | Motor vehicle transmission | |
| US2438539A (en) | Combined auxiliary transmission and power take-off | |
| CA1102584A (en) | Multiple speed transmission with auxiliary transfer drive | |
| USRE33336E (en) | Change speed transmission | |
| US4089237A (en) | Change speed transmission in range-type design for motor vehicles | |
| US4468980A (en) | Twin clutch pack for power shift transmission | |
| IL45413A (en) | Mechanical power transmission | |
| US4846016A (en) | Direct-coupling/differential changeover transfer apparatus | |
| EP2137431A1 (en) | Gear box for motor vehicles and motor vehicle comprising said gear box |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |