WO2005031191A1 - Multi-gear motor vehicle transmission and method for gear shifting - Google Patents
Multi-gear motor vehicle transmission and method for gear shifting Download PDFInfo
- Publication number
- WO2005031191A1 WO2005031191A1 PCT/SE2004/001285 SE2004001285W WO2005031191A1 WO 2005031191 A1 WO2005031191 A1 WO 2005031191A1 SE 2004001285 W SE2004001285 W SE 2004001285W WO 2005031191 A1 WO2005031191 A1 WO 2005031191A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- gearchange
- synchronisation
- transmission
- auxiliary shaft
- oil pump
- Prior art date
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
- F16H3/12—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 with means for synchronisation not incorporated in the clutches
Definitions
- the present invention relates to a multi-speed transmission for motor vehicles which comprises a main shaft and at least one auxiliary shaft and a synchronisation brake.
- the invention also relates to a gearchange method.
- One object of the present invention is thus to provide a synchronisation brake for an auxiliary transmission shaft, which brake can be manufactured and maintained at lower cost than the state of the art and allow a better-defined control characteristic than the state of the art.
- FIG. 1 depicts schematically a transmission with a first embodiment of the invention
- Fig. 2 depicts a general view of a computerised control system for, inter alia, gearchanging, which system is intended to be used for applying the invention
- FIG. 3 depicts schematically but in more detail a transmission with lubricating oil pump of rotary type, but not depicting an auxiliary shaft.
- ref. 1 denotes a transmission constituting part of a driveline of an undepicted motor vehicle, e.g. a truck.
- the transmission comprises inter alia a main shaft 2 arranged to be driven via a clutch 3 by the motor vehicle's engine 4, and at least one auxiliary shaft 5.
- the auxiliary shaft 5 acts upon and drives an oil pump 6 arranged to pump lubricating oil within the transmission to bearings 7 etc. in a conventional manner.
- the oil pump is also arranged to serve as synchronisation brake for braking of said auxiliary shaft, to which end the oil pump is provided on its outlet side 8 with an adjustable constriction 9 arranged for adjustable braking of said auxiliary shaft.
- the synchronisation brake indicated is arranged to be used during shaft speed synchronisation for a gearchange, and according to preferred embodiments the transmission is managed by a computerised control system 10 (Figs. 1 and 2) for the vehicle's driveline, arranged inter alia for mechanical gearchange with engine control, e.g. a system which is marketed under the name Opticruise and is schematically depicted in Fig. 2.
- the circled reference notations in Fig. 2 do not refer to the present description.
- the transmission may of course be managed and controlled by another computerised control system of a substantially corresponding kind and with substantially corresponding functions.
- the control system is thus arranged for, inter alia, automatically controlled gearchanges with the vehicle's clutch engaged.
- synchronisation braking of the auxiliary shaft is arranged to be controlled by the computerised control system 10, whereby adjustment of braking is intended to be effected in response to shaft speed measurements and in this case by adjustment of the constriction 9, the adjustment being effected by means of, for example, a suitable actuator of a known kind arranged to act upon a preferably stepless choke valve of a suitable known kind.
- the oil pump 6 of rotary type arranged to pump oil from an oil sump 11 in the transmission's bottom portion 12 to desired portions via an oil filter 13 for pressure lubrication, to which end the adjustable constriction 9 is arranged on the outlet side 8 of the pump for adjustable constriction of the oil flow being delivered and hence adjustable braking of the auxiliary shaft which is arranged to drive the oil pump.
- braking of said auxiliary shaft is intended to be effected for gearchange optimisation with the object of reducing gearchange time, particularly in the case of automatically controlled gearchanges with the clutch engaged.
- control system be so arranged that constriction of the lubricating oil flow from the oil pump and hence braking are effected at times when the transmission is not transmitting any torque, i.e. when the transmission is under no load. During periods of restricted lubrication, the transmission is thus unloaded.
- braking to this end is intended to be effected after a gear has been disengaged and before the next gear is engaged.
- An auxiliary shaft which acts drivingly upon an oil pump for lubrication of the transmission is also used for braking the auxiliary shaft for synchronisation purposes, to which end an adjustable constriction is arranged on the outlet side of the oil pump.
- the invention makes it inter alia possible, as compared with the state of the art, for an existing oil pump to be used, and for the technical solution concerned to provide a simple and inexpensive installation which requires little maintenance and which also provides extraordinarily well-defined stepless adjustability.
Abstract
Multi-speed transmission (1) for motor vehicles which comprises a main shaft (2) and at least one auxiliary shaft (5) and a synchronisation brake. The transmission is distinguished particularly by an oil pump (6) arranged in a conventional manner to be driven by an auxiliary shaft (5) and to pump lubricating oil within the transmission, and by the oil pump (6) being provided on its outlet side (8) with an adjustable constriction (9) arranged for adjustable braking of the auxiliary shaft acting upon the oil pump, to which end the oil pump with its constriction is arranged to serve as a synchronisation brake for said auxiliary shaft. The invention also relates to a gearchange method.
Description
Multi-gear motor vehicle transmission and method for gear shifting
Technical field
The present invention relates to a multi-speed transmission for motor vehicles which comprises a main shaft and at least one auxiliary shaft and a synchronisation brake.
The invention also relates to a gearchange method.
Background
Transmission of substantially the kind indicated above are previously known. A transmission is thus known from DE 33 08 525 in which an auxiliary shaft is arranged to be braked by a friction brake arrangement for synchronisation purposes. The technique thus known involves disadvantages in the form of high manufacturing and maintenance costs because the brake comprises brake plates and counterplates in a mutually axially movable configuration. Nor is a design of that kind ideal, since automatic adjustment of the rotation speed of the auxiliary shaft is usually necessary.
One object of the present invention is thus to provide a synchronisation brake for an auxiliary transmission shaft, which brake can be manufactured and maintained at lower cost than the state of the art and allow a better-defined control characteristic than the state of the art.
Summary of the invention
The object of the invention is achieved with a transmission with features according to the attached claims 1 and 6. Preferred embodiments are specified in the respective dependent claims.
Brief description of the drawings
The invention is described below in more detail with reference to examples of embodiments and the attached drawings, in which
- Fig. 1 depicts schematically a transmission with a first embodiment of the invention,
- Fig. 2 depicts a general view of a computerised control system for, inter alia, gearchanging, which system is intended to be used for applying the invention, and
- Fig. 3 depicts schematically but in more detail a transmission with lubricating oil pump of rotary type, but not depicting an auxiliary shaft.
In Fig. 1, ref. 1 denotes a transmission constituting part of a driveline of an undepicted motor vehicle, e.g. a truck. The transmission comprises inter alia a main shaft 2 arranged to be driven via a clutch 3 by the motor vehicle's engine 4, and at least one auxiliary shaft 5.
The auxiliary shaft 5 acts upon and drives an oil pump 6 arranged to pump lubricating oil within the transmission to bearings 7 etc. in a conventional manner.
According to the invention, the oil pump is also arranged to serve as synchronisation brake for braking of said auxiliary shaft, to which end the oil pump is provided on its outlet side 8 with an adjustable constriction 9 arranged for adjustable braking of said auxiliary shaft.
The synchronisation brake indicated is arranged to be used during shaft speed synchronisation for a gearchange, and according to preferred embodiments the transmission is managed by a computerised control system 10 (Figs. 1 and 2) for the vehicle's driveline, arranged inter alia for mechanical gearchange with engine control, e.g. a system which is marketed under the name Opticruise and is schematically depicted in Fig. 2. The circled reference notations in Fig. 2 do not refer to the present description. The transmission may of course be managed and controlled by another computerised control system of a substantially corresponding kind and with substantially corresponding functions.
The control system is thus arranged for, inter alia, automatically controlled gearchanges with the vehicle's clutch engaged.
According to one version of the invention, synchronisation braking of the auxiliary shaft is arranged to be controlled by the computerised control system 10, whereby adjustment of braking is intended to be effected in response to shaft speed measurements and in this case by adjustment of the constriction 9, the adjustment being effected by means of, for example, a suitable actuator of a known kind arranged to act upon a preferably stepless choke valve of a suitable known kind.
According to the version depicted in Fig. 3, the oil pump 6 of rotary type arranged to pump oil from an oil sump 11 in the transmission's bottom portion 12 to desired portions via an oil filter 13 for pressure lubrication, to which end the adjustable constriction 9 is arranged on the outlet side 8 of the pump for adjustable constriction of the oil flow being delivered and hence adjustable braking of the auxiliary shaft which is arranged to drive the oil pump.
Likewise according to the preferred version, braking of said auxiliary shaft is intended to be effected for gearchange optimisation with the object of reducing gearchange time, particularly in the case of automatically controlled gearchanges with the clutch engaged.
It is also preferable that the control system be so arranged that constriction of the lubricating oil flow from the oil pump and hence braking are effected at times when the transmission is not transmitting any torque, i.e. when the transmission is under no load. During periods of restricted lubrication, the transmission is thus unloaded. According to one version, braking to this end is intended to be effected after a gear has been disengaged and before the next gear is engaged.
Like the functioning of the transmission according to the invention, the method has probably been substantially indicated above.
An auxiliary shaft which acts drivingly upon an oil pump for lubrication of the transmission is also used for braking the auxiliary shaft for synchronisation purposes, to which end an adjustable constriction is arranged on the outlet side of the oil pump.
In addition to the general advantages which may be afforded by a synchronisation brake, inter alia in the form of quicker gearchanges and automatically controlled gearchanges, the invention makes it inter alia possible, as compared with the state of the art, for an existing oil pump to be used, and for the technical solution concerned to provide a simple and inexpensive installation which requires little maintenance and which also provides extraordinarily well-defined stepless adjustability.
The invention is described above in connection with examples of embodiments. A multiplicity of embodiments, as also minor modifications and additions, are of course conceivable, without having to depart from the concept of the invention.
The invention has therefore not to be regarded as limited to the embodiments indicated above but may be varied within its scope indicated by the attached claims.
Claims
1. A multi-speed transmission for motor vehicles which comprises a main shaft and at least one auxiliary shaft and a synchronisation brake, characterised by an oil pump (6) arranged in a conventional manner to be driven by an auxiliary shaft (5) and to pump lubricating oil within the transmission, and by the oil pump (6) being provided on its outlet side (8) with an adjustable constriction (9) arranged for adjustable braking of the auxiliary shaft acting upon the oil pump, to which end the oil pump with its constriction is arranged to act as a synchronisation brake for said auxiliary shaft.
2. A transmission according to claim 1 , characterised in that the synchronisation brake is arranged to be used during shaft speed synchronisation for a gearchange.
3. A transmission according to claim 1 or 2, characterised in that it is managed by a computerised control system (10) for the motor vehicle's driveline, arranged inter alia for mechanical gearchange with engine control.
4. A transmission according to claim 3, characterised in that the control system is arranged for automatically controlled gearchanges with the vehicle's clutch (3) engaged.
5. A transmission according to any one of the foregoing claims, characterised in that the synchronisation brake is arranged for gearchange optimisation with the object of reducing the time a gearchange takes.
6. A gearchange method for a multi-speed transmission for motor vehicles which comprises a main shaft and at least one auxiliary shaft and a synchronisation brake, characterised in that an auxiliary shaft (5) is braked for synchronisation purposes by an oil pump (6) upon which the auxiliary shaft acts and which to that end is provided with an adjustable constriction (9) on its outlet side (8).
7. A method according to claim 6, characterised in that braking is effected during shaft speed synchronisation for a gearchange.
8. A method according to claim 6 or 7, characterised in that the braking applied is adjusted by a computerised control system (10) for the motor vehicle's driveline, arranged inter alia for mechanical gearchange with engine control.
9. A method according to claim 8, characterised in that gearchanges are effected automatically with the vehicle's clutch (3) engaged, controlled by said control system.
10. A method according to claim 6, 7, 8, or 9, characterised in that braking is effected for gearchange optimisation with the object of reducing gearchange time during automatically controlled gearchanges.
11. A method according to claim 6, 7, 8, 9 or 10, characterised in that constriction of the oil flow from the oil pump, and hence braking, are effected at times when the transmission is not transmitting any torque.
12. A method according to claim 11, characterised in that braking is effected after a gear has been disengaged and before the next gear is engaged.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE0302604A SE525632C2 (en) | 2003-10-02 | 2003-10-02 | Multifunctional transmission for motor vehicles and gear shifting |
| SE0302604-4 | 2003-10-02 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2005031191A1 true WO2005031191A1 (en) | 2005-04-07 |
Family
ID=29247008
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/SE2004/001285 WO2005031191A1 (en) | 2003-10-02 | 2004-09-08 | Multi-gear motor vehicle transmission and method for gear shifting |
Country Status (2)
| Country | Link |
|---|---|
| SE (1) | SE525632C2 (en) |
| WO (1) | WO2005031191A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102007004182A1 (en) * | 2007-01-27 | 2008-07-31 | Zf Friedrichshafen Ag | Idle rattle reducing method for manual transmission, involves using pump in idle speed for realizing injecting lubricant of manual transmission to reduce rattle inclination by drag moment, where lubricant is powered by part of wheel set |
| DE102007004183A1 (en) * | 2007-01-27 | 2008-07-31 | Zf Friedrichshafen Ag | Method for assistance of synchronous processing by hand transmission, involves inserting pump for realization of injection lubrication of gear for controlled designing of drag torque |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19919511A1 (en) * | 1999-04-29 | 2000-11-02 | Zahnradfabrik Friedrichshafen | Braking device for rotating mass in gear changing transmission, with preset low revs. for oil pump and braking device to decelerate rotating mass |
-
2003
- 2003-10-02 SE SE0302604A patent/SE525632C2/en not_active IP Right Cessation
-
2004
- 2004-09-08 WO PCT/SE2004/001285 patent/WO2005031191A1/en active Application Filing
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19919511A1 (en) * | 1999-04-29 | 2000-11-02 | Zahnradfabrik Friedrichshafen | Braking device for rotating mass in gear changing transmission, with preset low revs. for oil pump and braking device to decelerate rotating mass |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102007004182A1 (en) * | 2007-01-27 | 2008-07-31 | Zf Friedrichshafen Ag | Idle rattle reducing method for manual transmission, involves using pump in idle speed for realizing injecting lubricant of manual transmission to reduce rattle inclination by drag moment, where lubricant is powered by part of wheel set |
| DE102007004183A1 (en) * | 2007-01-27 | 2008-07-31 | Zf Friedrichshafen Ag | Method for assistance of synchronous processing by hand transmission, involves inserting pump for realization of injection lubrication of gear for controlled designing of drag torque |
Also Published As
| Publication number | Publication date |
|---|---|
| SE0302604D0 (en) | 2003-10-02 |
| SE0302604L (en) | 2005-03-22 |
| SE525632C2 (en) | 2005-03-22 |
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