GB2113322A - Multi-speed layshaft gearbox - Google Patents
Multi-speed layshaft gearbox Download PDFInfo
- Publication number
- GB2113322A GB2113322A GB08201107A GB8201107A GB2113322A GB 2113322 A GB2113322 A GB 2113322A GB 08201107 A GB08201107 A GB 08201107A GB 8201107 A GB8201107 A GB 8201107A GB 2113322 A GB2113322 A GB 2113322A
- Authority
- GB
- United Kingdom
- Prior art keywords
- input
- gears
- gear
- fixed
- rotatable
- 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.)
- Withdrawn
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
- 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
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Structure Of Transmissions (AREA)
Abstract
A multi-speed gearbox comprises an input shaft (1) carrying a fixed gear (4) and one or more rotatable gears (5, 6), an output shaft (2) carrying a fixed gear (9) and one or more rotatable gears (10, 11) a layshaft (3) carrying a plurality of fixed gears (14-17) in engagement with the rotatable gears (5, 6, 10, 11) on the input and output shafts (1, 2), selector rings (7, 12) for selectively coupling the fixed gears (4, 9) on the input and output shafts, and means (8, 13, 20) for establishing a direct drive between the input and output shafts so that the layshaft is stationary when direct gear is selected, thereby reducing noise and wear and allowing a compact construction. <IMAGE>
Description
SPECIFICATION
Multi-speed gearbox
This invention relates to multi-speed gearboxes.
According to the present invention, there is provided a multi-speed gearbox comprising an input shaft carrying a fixed gear and at least one rotatable gear, an output shaft carrying a fixed gear and at least one rotatable gear, a layshaft carrying a plurality of fixed gears in engagement with the rotatable gears on the input shaft and on the output shaft, selector rings for selectively coupling the fixed gears on the input and output shafts to the rotatable gears on the input and output shafts, and means for establishing a direct drive between the input and output shafts.
By providing means for coupling the input shaft directly to the output shaft, a direct drive through the gearbox is established in which the layshaft is not driven. This permits a compact construction, a reduction in the number of gears in the gearbox and a reduction in noise and wear when the gearbox is operating with a direct drive.
Preferably the input and output shafts are coaxial, and the said means comprises a selector ring for selectively coupling fixed gears on the input and output shafts. The invention is especially suitable for a 5-speed gearbox, in which case the input and output shafts each carry two rotatable gears.
A preferred embodiment of the invention will now be described by way of example only with reference to the accompanying drawings which are each diagrams of a gearbox in accordance with the invention with the various gear ratios selected.
Referring to Fig. 1, a 5-speed gearbox comprises a housing in which an input shaft
1, and output shaft 2, and a layshaft 3 are all rotatably mounted. The input shaft 1 carries a first fixed gear 4 and first and second rotatable gears 5, 6 mounted on opposite sides of the fixed gear and each provided with synchromesh cones. A first selector ring 7 is mounted on the input shaft 1 and may be moved axially along the input shaft 1 by means of a selector fork (not shown) to effect a driving connection between the first fixed gear 4 and one or other of the adjacent rotatable gears 5, 6.
The inner end of the input shaft 1 carries a second fixed gear 8, which includes a synchromesh cone, and rotatably receives the
inner end of the output shaft 2 which is coaxial with the input shaft 1. The output shaft 2 carries a third fixed gear 9 and third and fourth rotatable gears 10, 11 mounted on opposite sides of the third fixed gear 9 and each provided with synchromesh cones. A second selector ring 1 2 is mounted on the output shaft and may be moved axially along the output shaft 2 by means of a selector fork (not shown) to effect a driving connection between the third fixed gear 9 and one or other of the adjacent rotatable gears 10, 11.
The inner end of the output shaft carries a fourth fixed gear 1 3 which lies next to the second fixed gear 8 on the input shaft 1 and may be connected thereto by third selector ring 20 which is slidable axially along the output shaft 2 by means of a selector fork (not shown).
The layshaft 3 is mounted parallel to the axes of the input and output shafts 1 and 2 and carries first, second, third and fourth fixed gears 14-1 7 which mesh with the first, second, third and fourth rotatable gears 5, 6, 10,
11 on the input and output shafts respectively.
The gearbox provides five forward gears in the following manner.
The first gear ratio is selected by engaging the first selector ring 7 with the first fixed gear 4 and the first rotatable gear 5 on the input shaft 1; engaging the second selector ring 1 2 with the third fixed gear 9 and the fourth rotatable gear 11 on the output shaft 2; and positioning the third selector ring 20 in engagement with the third fixed gear 1 3 on the output shaft 2 but out of engagement with the second fixed gear 8 on the input shaft 1. The input and output shafts are thus coupled together via the first and fourth fixed gears 14, 1 7 on the layshaft 3, as illustrated by the arrows in Fig. 1.
The second gear ratio is selected by engag
ing the first selector ring 7 with the first fixed gear 4 and the first rotatable gear 5 on the input shaft 1; engaging the second selector ring 1 2 with the third fixed gear 9 and the third rotatable gear 10 on the output shaft; and positioning the third selector ring 20 in
engagement with the third fixed gear 1 3 on the output shaft 2 but out of engagement with the second fixed gear 8 on the input shaft 1. The input and output shafts are thus coupled together via the first and third fixed
gears 14, 1 6 on the layshaft 3, as illustrated
in Fig. 2.
The third gear ratio is selected by engaging the first selector ring 7 with the first fixed
gear 4 and the second rotatable gear 6 on the
input shaft 1; engaging the second selector
ring 1 2 with the third fixed gear 9 and the fourth rotatable gear 11 on the output shaft
2; and positioning the third selector ring 20
in engagement with the third fixed gear 1 3 on
the output shaft 2, but out of engagement
with the second fixed gear 8 on the input
shaft 1. The input and output shafts are thus
coupled together via the second and fourth
fixed gears 15, 1 7 on the layshaft 3, as
illustrated in Fig. 3.
The fourth gear ratio is selected by engag
ing the first selector ring 7 with the first fixed
gear 4 and the second rotatable gear 6 on the input shaft 1; engaging the second selector ring 12 with the third fixed gear 9 and the third rotatable gear 10 in the output shaft 2; and positioning the third selector ring 20 in engagement with the third fixed gear 1 3 on the output shaft 2 but out of engagement with the second fixed gear 8 on the input shaft 1. The input and output shafts are thus coupled together via the second and third fixed gears 15, 16, on the layshaft 3, as illustrated in Fig. 4.
The fifth gear ratio, or direct drive, is selected by positioning the first and second selector rings 7, 12 in engagement with the first and third fixed gears 4, 9 on the input and output shafts 1, 2 respectively but out of engagement with either the first or the second rotatable gears 3, 6 or the third and fourth rotatable gears 10, 11 respectively; and engaging the third selector ring 20 in engagement with the third fixed gear 1 3 on the input shaft 2 and the second fixed gear 8 in the input shaft 1. The input and output shafts 1, 2 are thus coupled together directly, as illustrated in Fig. 5.
When the gearbox is in the fifth, gear ratio, or direct drive, the layshaft 3 is not connected to the input or output shafts 1, 2. Consequently, smaller frictional forces are generated in this gear ratio, and noise and wear are reduced. The gearbox is compact, and since it includes relatively few moving parts, it is cheap to produce.
Claims (4)
1. A multi-speed gearbox comprising an input shaft carrying a fixed gear and at least one rotatable gear, an output shaft carrying a fixed gear and at least one rotatable gear, a layshaft carrying a plurality of fixed gears in engagement with the rotatable gears on the input shaft and on the output shaft, selector rings for selectively coupling the fixed gears on the input and output shafts to the rotatable gears on the input and output shafts, and means for establishing a direct drive between the input and output shafts.
2. A gearbox according to claim 1 wherein the input and output shafts are coaxial, and the said means comprises a selector ring for selectively coupling fixed gears on the input and output shafts.
3. A gearbox according to claim 1 wherein the input and output shafts each carry two rotatable gears.
4. A multi-speed gearbox substantially as hereinbefore described, and as illustrated in the drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08201107A GB2113322A (en) | 1982-01-15 | 1982-01-15 | Multi-speed layshaft gearbox |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08201107A GB2113322A (en) | 1982-01-15 | 1982-01-15 | Multi-speed layshaft gearbox |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB2113322A true GB2113322A (en) | 1983-08-03 |
Family
ID=10527641
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08201107A Withdrawn GB2113322A (en) | 1982-01-15 | 1982-01-15 | Multi-speed layshaft gearbox |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2113322A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0672225A1 (en) * | 1992-12-08 | 1995-09-20 | Getrag Gears of North America, Inc. | Multi-speed rear wheel drive transmission |
| GB2384532A (en) * | 2002-01-25 | 2003-07-30 | Eaton Corp | Arrangement of drive shafts in a change gear transmission |
| DE102005005338B3 (en) * | 2005-01-27 | 2006-08-10 | Getrag Getriebe- Und Zahnradfabrik Hermann Hagenmeyer Gmbh & Cie Kg | Speed gearbox |
| US7350430B2 (en) * | 2002-08-28 | 2008-04-01 | Zf Friedrichshafen Ag | Transmission having direct gear |
| WO2014167314A1 (en) * | 2013-04-08 | 2014-10-16 | Paratus Developments Limited | A gear box |
-
1982
- 1982-01-15 GB GB08201107A patent/GB2113322A/en not_active Withdrawn
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0672225A1 (en) * | 1992-12-08 | 1995-09-20 | Getrag Gears of North America, Inc. | Multi-speed rear wheel drive transmission |
| EP0672225A4 (en) * | 1992-12-08 | 1996-06-12 | Getrag Gears Of North America | Multi-speed rear wheel drive transmission. |
| GB2384532A (en) * | 2002-01-25 | 2003-07-30 | Eaton Corp | Arrangement of drive shafts in a change gear transmission |
| US7350430B2 (en) * | 2002-08-28 | 2008-04-01 | Zf Friedrichshafen Ag | Transmission having direct gear |
| DE102005005338B3 (en) * | 2005-01-27 | 2006-08-10 | Getrag Getriebe- Und Zahnradfabrik Hermann Hagenmeyer Gmbh & Cie Kg | Speed gearbox |
| US7472617B2 (en) | 2005-01-27 | 2009-01-06 | Getrag Getriebe- Und Zahnradfabrik Hermann Hagenmeyer Gmbh & Cie Kg | Step-by-step variable transmission |
| WO2014167314A1 (en) * | 2013-04-08 | 2014-10-16 | Paratus Developments Limited | A gear box |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR100278041B1 (en) | High capacity combined transmission | |
| CA1213754A (en) | Dual input clutch transmission | |
| US4548100A (en) | Transmission for motor vehicles | |
| EP1245863A2 (en) | A motor-vehicle gearbox | |
| US5722291A (en) | Manual transmission with synchronized reverse gear | |
| KR910010087B1 (en) | Change - speed gearbox | |
| US4515031A (en) | Chain driven reverse gear for a manual transmission | |
| US5704247A (en) | Compact manual transaxle for motor vehicles | |
| US4116082A (en) | Compact manual transmission for a transversely mounted engine | |
| US4738150A (en) | Compact manual transaxle transmission | |
| US5609062A (en) | Compounded countershaft transmission | |
| EP0210394A1 (en) | Power transmission for motor vehicle | |
| EP1031762B1 (en) | Manual transaxle | |
| US2511539A (en) | Five-speed transmission | |
| US5697250A (en) | Compact manual transaxle | |
| GB2113322A (en) | Multi-speed layshaft gearbox | |
| US5458015A (en) | Gearshift transmission of a motor vehicle having a gear ratio utilizing gear sets of other gear ratios | |
| GB2079877A (en) | Multi-ratio gearbox | |
| US4679455A (en) | Multiratio power transmission | |
| US4738162A (en) | Planetary gear transmission | |
| RU2272946C1 (en) | Gear box | |
| EP0304334A2 (en) | Manual transmission for motor vehicle | |
| JPH04302749A (en) | Transmission | |
| JPH08159222A (en) | Transmission | |
| KR200227360Y1 (en) | Manual transmission |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |