GB1229348A – – Google Patents
GB1229348A – – Google Patents
Info
Publication number
GB1229348A
GB1229348A
GB1229348DA
GB1229348A
GB 1229348 A
GB1229348 A
GB 1229348A
GB 1229348D A
GB1229348D A
GB 1229348DA
GB 1229348 A
GB1229348 A
GB 1229348A
Authority
GB
United Kingdom
Prior art keywords
clutch
wheels
piston
wheel
reverse
Prior art date
1968-09-11
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
Application number
Priority date (The priority date 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 date listed.)
1968-09-11
Filing date
1969-09-11
Publication date
1971-04-21
1969-09-11
Application filed
filed
Critical
1971-04-21
Publication of GB1229348A
publication
Critical
patent/GB1229348A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
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
F16H3/00—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion
F16H3/02—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion without gears having orbital motion
F16H3/08—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion without gears having orbital motion exclusively or essentially with continuously meshing gears, that can be disengaged from their shafts
F16H3/087—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion without gears having orbital motion exclusively or essentially with continuously meshing gears, that can be disengaged from their shafts characterised by the disposition of the gears
F16H3/093—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion without gears having orbital motion exclusively or essentially with continuously meshing gears, that can be disengaged from their shafts characterised by the disposition of the gears with two or more countershafts
F16H3/097—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion without gears having orbital motion exclusively or essentially with continuously meshing gears, that can be disengaged from their shafts characterised by the disposition of the gears with two or more countershafts the input and output shafts being aligned on the same axis
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
F16H3/00—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion
F16H3/02—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion without gears having orbital motion
F16H3/08—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion without gears having orbital motion exclusively or essentially with continuously meshing gears, that can be disengaged from their shafts
F16H3/087—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion without gears having orbital motion exclusively or essentially with continuously meshing gears, that can be disengaged from their shafts characterised by the disposition of the gears
F16H3/091—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion without gears having orbital motion exclusively or essentially with continuously meshing gears, that can be disengaged from their shafts characterised by the disposition of the gears including a single countershaft
F16H3/0915—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion without gears having orbital motion exclusively or essentially with continuously meshing gears, that can be disengaged from their shafts characterised by the disposition of the gears including a single countershaft with coaxial input and output shafts
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
F16H63/00—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism
F16H63/02—Final output mechanisms therefor; Actuating means for the final output mechanisms
F16H63/30—Constructional features of the final output mechanisms
F16H63/34—Locking or disabling mechanisms
F16H63/3408—Locking or disabling mechanisms the locking mechanism being moved by the final actuating mechanism
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
F16H3/00—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion
F16H3/02—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion without gears having orbital motion
F16H3/08—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion without gears having orbital motion exclusively or essentially with continuously meshing gears, that can be disengaged from their shafts
F16H3/087—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion without gears having orbital motion exclusively or essentially with continuously meshing gears, that can be disengaged from their shafts characterised by the disposition of the gears
F16H3/093—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion without gears having orbital motion exclusively or essentially with continuously meshing gears, that can be disengaged from their shafts characterised by the disposition of the gears with two or more countershafts
F16H2003/0933—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion without gears having orbital motion exclusively or essentially with continuously meshing gears, that can be disengaged from their shafts characterised by the disposition of the gears with two or more countershafts with coaxial countershafts
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
F16H2200/00—Transmissions for multiple ratios
F16H2200/003—Transmissions for multiple ratios characterised by the number of forward speeds
F16H2200/006—Transmissions for multiple ratios characterised by the number of forward speeds the gear ratios comprising eight forward speeds
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
F16H2200/00—Transmissions for multiple ratios
F16H2200/003—Transmissions for multiple ratios characterised by the number of forward speeds
F16H2200/0065—Transmissions for multiple ratios characterised by the number of forward speeds the gear ratios comprising nine forward speeds
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
F16H2200/00—Transmissions for multiple ratios
F16H2200/0082—Transmissions for multiple ratios characterised by the number of reverse speeds
F16H2200/0086—Transmissions for multiple ratios characterised by the number of reverse speeds the gear ratios comprising two reverse speeds
Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
Y10T74/00—Machine element or mechanism
Y10T74/19—Gearing
Y10T74/19219—Interchangeably locked
Y10T74/19228—Multiple concentric clutch shafts
Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
Y10T74/00—Machine element or mechanism
Y10T74/19—Gearing
Y10T74/19219—Interchangeably locked
Y10T74/19377—Slidable keys or clutches
Y10T74/19386—Multiple clutch shafts
Y10T74/194—Selective
Abstract
1,229,348. Change-speed gear. ADOLF SAURER Ltd. 11 Sept., 1969 [11 Sept., l968], No. 44892/69. Heading F2D. A selective change-speed gear providing eight or twelve forward ratios (including one or two overdrives) and two reverse ratios comprises a freely mounted countershaft wheel-pair 31, 33, driven at either of two ratios by freely mounted wheels 12, 11 selectively connected to a clutch-driven input shaft 3 by a double synchromesh clutch A, B, the countershaft 7 having fast thereon a further wheel-pair 25, 26 clutchable at E to the wheel-pair 31, 33, and meshing freely mounted wheels 21, 13 selectively connectible to a main output shaft 6 by a double synchromesh clutch F, G, the wheel 13 being also clutchable at D to the wheel 12. For reverse the free countershaft pair 31, 33 drives the countershaft 7 through a group of reverse idlers, on fixed pins 36, meshing a wheel 35, fast with the wheel-pair 31, 33, and an internal ring gear 37, slidable axially into clutch engagement R with the countershaft 7. Ratios are as follows. First-clutch B, wheels 12, 31, clutch E wheels 25, 21, clutch G; second-clutch A, wheels 12, 33, clutch E, then as first; third-clutches B, D, wheels 13, 26, 25, 21, clutch G; fourth-clutch A, wheels 11, 33, 31, 12, clutch D, wheels 13, 26, 25, 21, clutch G; fifth-clutch B, wheels 12, 31, clutch E, wheels 26, 13, clutch F ; sixth-clutch A, wheels 11, 33, clutch E, wheels 26, 13, clutch F; seventh -clutches B, D, F direct drive; eighth-clutch A, wheels 11, 33, 31, 12, clutches D, F, overdrive. For the two reverses, clutch A or B, wheels 11, 33, or 12, 31, reverse clutch R, wheels 25, 21 and clutch G. The twelve-speed modification, Figs. 3 and 4 (not shown), has at its output end an additional meshing wheel-pair, one wheel secured to the output shaft, the other clutchable to the countershaft. An additional overdrive and three reduced ratios are thereby provided. The output wheel may drive a power take-off, e.g. for a brake. Control.-Mechanical control combined with hydraulic or compressed air actuation, with or without unspecified automatic control may be used. An entirely independent manual control, not described, actuates the double input clutch A, B. The remaining clutches D, E, F, G are actuated by a gate-guided manual shift lever 47, of which the cross-shift movement from 3-4 channel, by axial movement of a slide-turn rod 45, opens a valve 62 supplying compressed air from a line 63 to the left face of a piston 52, where it overcomes leftward pressure acting constantly on a smaller face 57 to change from clutch F to G. Movement of the shift lever 47 in the selector channels 1, 2; 3, 4, or R turns the rod 45 to engage the clutches D, E alternatively by a common fork 41, pivoted at 42. Turning movement of the rod 45 in any of the selector channels is positively prevented unless either clutch F or G is engaged, by the rod of a piston 75 engaging grooves 77 in a sector 46 turning with the rod. When the clutch piston 52 is in an intermediate position between F and G, a spring-loaded detent 66 is lifted out of a notch 64 or 65 to open a valve 70 supplying compressed air to the piston 75 which thus locks the sector 46 from turning. With either clutch F or G engaged the detent 66 closes the valve 70 and vents the lock piston 75, thus freeing the sector 46. In the reverse channel R, the shift lever 47 leaves the groove in the shift fork 41 and actuates the reverse clutch R through linkage not shown. In the twelve speed, two reverse gear, Figs. 3 and 4, not shown, ratios five to eight require a neutral position for the double clutch F, G, so that its servo piston (84) has three positions provided by a compound piston (87, 89). An additional two-position piston (101) actuates the additional clutch (H). Two valves (96, 97) such as 58, Fig. 2, determine the three positions of the piston (84), the neutral position corresponding to the central 3, 4 channel of the lever gate which now has three forward channels 1, 2; 3, 4; 5, 6 and one reverse. A single interlock piston 72 (as in Fig. 2) is now energized through a shuttle-valve (111) through either a valve (115) such as 70, Fig. 2, engaging one of three notches in the piston-rod, or a similar valve (116) engaging one of two notches in the rod of the piston (101) of the additional clutch (H). In addition, a further valve (107) such as 70 engages a single neutral notch in the pistonrod of the clutches F, G, to vent the neutralizing side of the additional clutch piston (101) to prevent disengagement of the additional clutch (H) whilst the clutches F, G are in neutral position. A countershaft pinion between wheels 31, 33 drives an oil pump for lubricating the gear.
GB1229348D
1968-09-11
1969-09-11
Expired
GB1229348A
(en)
Applications Claiming Priority (1)
Application Number
Priority Date
Filing Date
Title
CH1356768A
CH498317A
(en)
1968-09-11
1968-09-11
Countershaft transmission
Publications (1)
Publication Number
Publication Date
GB1229348A
true
GB1229348A
(en)
1971-04-21
Family
ID=4393510
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB1229348D
Expired
GB1229348A
(en)
1968-09-11
1969-09-11
Country Status (7)
Country
Link
US
(1)
US3600963A
(en)
AT
(1)
AT298256B
(en)
CH
(1)
CH498317A
(en)
DE
(1)
DE1943476A1
(en)
ES
(1)
ES371290A1
(en)
FR
(1)
FR2017776A1
(en)
GB
(1)
GB1229348A
(en)
Cited By (1)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
US5335562A
(en)
*
1992-12-08
1994-08-09
Mastroianni Cesare G
Multi-speed rear wheel drive transmission with reduced in-neutral gear rattle
Families Citing this family (37)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
US4000662A
(en)
*
1975-09-05
1977-01-04
Clark Equipment Company
Multiple input transmission
US4157044A
(en)
*
1977-06-13
1979-06-05
Peltz Johnny W
Five speed motorcycle transmission
DE2736929C3
(en)
*
1977-08-16
1981-04-02
Zahnradfabrik Friedrichshafen Ag, 7990 Friedrichshafen
Switchable spur gear
US4271715A
(en)
*
1978-07-04
1981-06-09
Toyota Jidosha Kogyo Kabushiki Kaisha
Transmission equipped with auxiliary speed changing gear
JPS5814940B2
(en)
*
1978-07-20
1983-03-23
トヨタ自動車株式会社
Transmission with auxiliary gearbox
DE3011131A1
(en)
*
1980-03-22
1981-10-01
Volkswagenwerk Ag, 3180 Wolfsburg
Motor vehicle mechanical gearbox selector mechanism – has restrictor limiting selection movement for particular trains of gears
US4388843A
(en)
*
1980-11-21
1983-06-21
Eaton Corporation
Auxiliary transmission neutral positioning and locking control and mechanism
US4398432A
(en)
*
1980-12-22
1983-08-16
Allis-Chalmers Corporation
Transmission with overrunning clutches
DE3141271C2
(en)
*
1981-10-17
1984-04-26
Zahnradfabrik Friedrichshafen Ag, 7990 Friedrichshafen
Driving speed-dependent switching device
US4738150A
(en)
*
1982-08-09
1988-04-19
Borg-Warner Corporation
Compact manual transaxle transmission
US4697471A
(en)
*
1985-01-30
1987-10-06
Mazda Motor Corporation
Automatic transmission apparatus
EP0195452B1
(en)
*
1985-03-21
1990-10-17
Friedrich Prof. Dr.-Ing. Jarchow
Contunuously variable compound power shift transmission of the range-speed type with multiple power path
US4635495A
(en)
*
1985-10-18
1987-01-13
Twin Disc, Incorporated
Multi-speed reversible power transmission
CA2011559C
(en)
*
1990-03-06
1993-10-12
Michael Stasiuk
Tractor transmission
US5390561A
(en)
*
1993-05-20
1995-02-21
Eaton Corporation
Compound transmission
DE4447214A1
(en)
*
1994-12-31
1996-07-04
Gerd Hoermansdoerfer
Gear change transmission with different gear ratios
DE10120060A1
(en)
*
2001-04-24
2002-10-31
Zahnradfabrik Friedrichshafen
vehicle transmissions
JP4067310B2
(en)
*
2002-01-17
2008-03-26
ヤンマー農機株式会社
Rice transplanter
DE10235404A1
(en)
*
2002-08-02
2004-02-12
Bayerische Motoren Werke Ag
Gearshift mechanism for a motor vehicle has two gearshift bushes to slide on-axis and to change gear speeds and a gearshift unit
DE102005021674A1
(en)
2005-05-11
2006-12-14
Bayerische Motoren Werke Ag
Vehicle transmission with six forward gears for normal driving, as well as a creep or hill run and a reverse gear
CN102296654A
(en)
*
2010-06-22
2011-12-28
天津建筑机械厂
Mechanical gearbox of bulldozer
CN102563058A
(en)
*
2012-02-09
2012-07-11
上海三一精机有限公司
Transmission and numerical-control machine tool
DE102012020884A1
(en)
2012-10-24
2014-04-24
Audi Ag
Speed change gearbox for motor vehicles
CN104121360B
(en)
*
2013-04-28
2017-02-08
北汽福田汽车股份有限公司
Manual gear car reverse gear shift prevention automatic control system and clutch assembly
WO2018118128A1
(en)
*
2016-12-22
2018-06-28
Eaton Corporation
High efficiency, high output transmission
CN110177959B
(en)
2016-12-22
2023-03-03
伊顿康明斯自动传输技术有限责任公司
High-efficiency high-output speed variator
US10737696B2
(en)
2016-12-22
2020-08-11
Eaton Cummins Automated Transmission Technologies, Llc
System, method, and apparatus for operating a high efficiency, high output transmission
US11105412B2
(en)
2016-12-22
2021-08-31
Eaton Cummins Automated Transmission Technologies Llc
System, method, and apparatus for managing transmission shutdown operations
EP3559512A4
(en)
2016-12-22
2020-06-10
Eaton Corporation
System, method, and apparatus for operating a high efficiency, high output transmission
USD866625S1
(en)
2017-02-28
2019-11-12
Eaton Cummins Automated Transmission Technologies, Llc
Transmission housing
USD933712S1
(en)
2017-02-28
2021-10-19
Eaton Cummins Automated Transmission Technologies, Llc
Clutch housing
USD914073S1
(en)
2017-02-28
2021-03-23
Eaton Cummins Automated Transmission Technologies, Llc
Transmission rear housing
USD881248S1
(en)
2017-02-28
2020-04-14
Eaton Cummins Automated Transmission Technologies, Llc
Lube assembly housing
USD915485S1
(en)
2019-09-13
2021-04-06
Eaton Cummins Automated Transmission Technologies, Llc
Transmission rear housing
USD930725S1
(en)
2019-09-13
2021-09-14
Eaton Cummins Automated Transmission Technologies, Llc
Transmission main housing
USD906389S1
(en)
2019-09-13
2020-12-29
Eaton Cummins Automated Transmission Technologies, Llc
Transmission housing assembly
USD966371S1
(en)
2019-09-13
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Transmission intermediate plate
Family Cites Families (6)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
US2181460A
(en)
*
1936-06-06
1939-11-28
Maybach Motorenbau Gmbh
Change-speed gear
US2269215A
(en)
*
1938-05-19
1942-01-06
Zahnradfabrik Friedrichshafen
Vehicle change-speed gear
US2246636A
(en)
*
1940-02-07
1941-06-24
Spicer Mfg Corp
Transmission gearing
US2567446A
(en)
*
1944-10-30
1951-09-11
Borg Warner
Automatic transmission
US2857772A
(en)
*
1954-07-01
1958-10-28
Rech S Pour Engins Mecaniques
Change speed gearings
US3115047A
(en)
*
1960-08-08
1963-12-24
Ford Motor Co
Synchronized multiple speed power transmission mechanism
1968
1968-09-11
CH
CH1356768A
patent/CH498317A/en
not_active
IP Right Cessation
1969
1969-08-27
US
US853316A
patent/US3600963A/en
not_active
Expired – Lifetime
1969-08-27
DE
DE19691943476
patent/DE1943476A1/en
active
Pending
1969-08-28
AT
AT823369A
patent/AT298256B/en
not_active
IP Right Cessation
1969-09-06
ES
ES371290A
patent/ES371290A1/en
not_active
Expired
1969-09-08
FR
FR6930461A
patent/FR2017776A1/fr
not_active
Withdrawn
1969-09-11
GB
GB1229348D
patent/GB1229348A/en
not_active
Expired
Cited By (1)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
US5335562A
(en)
*
1992-12-08
1994-08-09
Mastroianni Cesare G
Multi-speed rear wheel drive transmission with reduced in-neutral gear rattle
Also Published As
Publication number
Publication date
ES371290A1
(en)
1971-09-01
CH498317A
(en)
1970-10-31
AT298256B
(en)
1972-04-25
DE1943476A1
(en)
1970-03-19
US3600963A
(en)
1971-08-24
FR2017776A1
(en)
1970-05-22
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Legal Events
Date
Code
Title
Description
1971-09-02
PS
Patent sealed [section 19, patents act 1949]
1977-04-06
PLNP
Patent lapsed through nonpayment of renewal fees
