EP0181897A1 - Boite de vitesses etagee a changement assiste, en particulier pour vehicules a moteur - Google Patents

Boite de vitesses etagee a changement assiste, en particulier pour vehicules a moteur

Info

Publication number
EP0181897A1
EP0181897A1 EP19850902513 EP85902513A EP0181897A1 EP 0181897 A1 EP0181897 A1 EP 0181897A1 EP 19850902513 EP19850902513 EP 19850902513 EP 85902513 A EP85902513 A EP 85902513A EP 0181897 A1 EP0181897 A1 EP 0181897A1
Authority
EP
European Patent Office
Prior art keywords
piston
servo
shift
movement
rod
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Withdrawn
Application number
EP19850902513
Other languages
German (de)
English (en)
Inventor
Hermann Klaue
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Klaue Hermann Dr
JM Voith GmbH
Original Assignee
Klaue Hermann Dr
JM Voith GmbH
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.)
Filing date
Publication date
Application filed by Klaue Hermann Dr, JM Voith GmbH filed Critical Klaue Hermann Dr
Publication of EP0181897A1 publication Critical patent/EP0181897A1/fr
Withdrawn legal-status Critical Current

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
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/26—Generation or transmission of movements for final actuating mechanisms
    • F16H61/28—Generation or transmission of movements for final actuating mechanisms with at least one movement of the final actuating mechanism being caused by a non-mechanical force, e.g. power-assisted
    • F16H61/30—Hydraulic or pneumatic motors or related fluid control means therefor
    • 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
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/26—Generation or transmission of movements for final actuating mechanisms
    • F16H61/28—Generation or transmission of movements for final actuating mechanisms with at least one movement of the final actuating mechanism being caused by a non-mechanical force, e.g. power-assisted
    • F16H61/30—Hydraulic or pneumatic motors or related fluid control means therefor
    • F16H2061/301—Hydraulic or pneumatic motors or related fluid control means therefor for power assistance, i.e. servos with follow up action

Definitions

  • the invention relates to a servo-switched multi-step transmission, in particular for motor vehicles, in particular with the features specified in the preamble of claim 1.
  • the force transmission takes place by means of positive shifting elements which require a synchronizing device.
  • Other servo-switched transmissions have friction shift elements instead; these can synchronize themselves, but they cause performance losses when released.
  • a so-called servo switching device is provided, known, for example, from DE-OS 14 80 723.
  • the manual shifting of gears is made easier by the fact that some sliding sleeves are actuated by means of a Koloen-cylinder arrangement.
  • the piston-cylinder arrangement is controlled by means of a control valve which can be actuated by the manual shift lever.
  • the disadvantage here is that the control valve is separated from the piston-cylinder arrangement and that the shift fork is designed as an angle lever. This results in high manufacturing and assembly costs.
  • the invention has for its object to provide a manually switchable, form-fitting switching elements and a friction synchronizer having stepped gearbox, in which a servo switching device is realized with simpler means than previously, which reduces the effort required for switching and the duration of the power flow interruption.
  • the piston-cylinder arrangement is then combined with the control valve used to control it to form a compact assembly.
  • no separate lines need be provided between the control valve and the piston-cylinder arrangement. Rather, only very short servo means channels are required, which are guided from the valve head (which forms the housing of the control valve) through the piston directly into the cylinder spaces.
  • the piston and the valve head could be combined into a one-piece component. In general, however, it is expedient to first manufacture two separate components which are rigidly screwed to one another to facilitate production.
  • the measure specified in claim 2 ensures that the supply of the servo means to the piston to be actuated can be metered particularly sensitively.
  • the speed of closing (engagement) of the friction synchronizer and thus the speed of the The switching process can be determined by the amount of the spring tension force acting between the valve head and the shift rod, this being determined by the amount of the manual force acting on the shift lever.
  • the measure specified in claim 3 enables the following to be achieved: it is only necessary to provide the usual catches or stops on the shift rod in order to determine the stroke of the shift rod.
  • the slight overlap of the control edges located in the shift rod and in the valve head means that the piston follows every movement of the shift rod almost without delay.
  • the stroke of the piston (and thus also the adjustment path of the sliding sleeve) is therefore essentially the same as the stroke of the shift rod.
  • Oil or air is used as the servo.
  • the servo power can be generated by the negative pressure that arises in the intake manifold of the engine.
  • the measures specified in claims 4 and 5 serve to further simplify the construction and to gain a particularly space-saving, compact design. This is because the majority of the force used to close the synchronizing elements when switching is applied in the immediate vicinity of the synchronizing elements. The operating linkage can thus be made simpler and weight can be saved.
  • cables can be used for operation between the manual shift lever and the shift rod which forms the valve body. As a result, linkage deflections, which generate play and thus impair the switching accuracy, are avoided.
  • FIG. 1 shows a longitudinal section marked AB in FIG. 2.
  • FIG. 2 shows a cross section marked CD in FIG. 1.
  • FIG. 3 shows an enlarged section from FIG. 1.
  • a four-speed manual transmission for a passenger car is chosen as the exemplary embodiment.
  • the drive shaft 2 which is equipped with five drive wheels 2 1 to 2 5 , is mounted in the housing 1.
  • the drive gears 2, to 2 4 are constantly engaged with the ratchets 3 2 to 3 5 , which are mounted on the output shaft 3. This carries the bevel pinion 3 1 at one end and the driven gear 3 6 of the reverse gear at the other end.
  • the synchronization takes place through cone rings 3 11 .
  • the shift forks 4 and 5 are axially positively connected on their ends opposite the fork extensions to the double pistons 6 and 7 arranged in the cylinder 8.
  • the two double pistons 6 and 7 form four pressure chambers 8 4 to 8 7 in the disks 8 1 , 8 2 and 8 3 delimited cylinder spaces and are supported by springs 8 8 .
  • the shift fork 4 or 5 extends through one, while the other forms the free space for the valve head 9 or 10, which is connected to the double piston 6 or 7 by screws 11.
  • Each of the valve heads 9 and 10 comprises one of the two hollow drilled shift rods 12 and 13, which are connected to the suction line of the engine via bores 15.
  • Another shift rod 14, which is only shown in broken lines, is connected to the intermediate wheel (not shown for the sake of clarity), which engages with the wheels 2 5 and 3 6 when reversing.
  • an outer shift rod 16 is provided, which is connected to the manual shift lever, not shown.
  • the shift finger 16 is pivoted into the groove of the shift rod 12, 13 or 14 to be actuated and shifted in the longitudinal direction of the transmission by turning the shift rod 16 into the relevant shift gate.
  • the locking plate 17 serves as a fuse, which is rotated together with the shift rod 16 and only releases one of the shift rods 12, 13 or 14 for switching.
  • each of the switching rods 12 and 13 has three ring channels 12 3 , 12 4 and 12 5 , of which the middle ring channel 12 4 Servo means leads and in the present example is connected to the intake manifold of the engine.
  • the two outer ring channels 12 3 and 12 5 are always open to the interior 18. This is connected to the atmosphere for the purpose of air exchange via a dust-tight lock (not shown).
  • two ring channels 9 1 and 9 2 are incorporated, of which the channel 9 1 via the bore 6 1 with the pressure chamber 8 4 and the channel 9 2 via the bore 6 2 with the pressure chamber 8 5 in Connection stands.
  • no gear is shifted because the ring channels 9 1 and 9 2 are not connected to one of the ring channels 12 3 -12 5 of the shift rod (see FIG. 3).
  • a helical compression spring 12 1 , 12 2 engages on both sides of the valve head 9 and is supported on the switching rod 12 via an adjusting ring.
  • the shift sleeve 3 9 must be connected to the gear teeth of the gear 3 3 via the synchronizing ring 3 11 .
  • the shift rod 12 must be moved to the right using the outer shift rod 16 and the shift finger 16.
  • the spring 12 1 is tensioned and the right control edge 24 of the ring channel 12 4 carrying vacuum air is moved beyond the left control edge 42 of the ring channel 9 2 .
  • the pressure chamber 8 5 receives negative pressure in accordance with the tension of the spring 12 1 , ie in accordance with the switching force exerted by the driver.
  • the ring channel 12 3 of the switching rod 12 connects the pressure chamber 8 4 to the atmosphere via the ring channel 9 1 in the valve head 9.
  • the double piston 6 moves together with the shift fork 4 to the right, synchronizes and establishes the connection between the gear 3 3 and the output shaft 3, so that the drive in the second gear.
  • the driver can determine the speed of the switching operation by metering the switching force and thus the tension of the spring 12 1 (or 12 2 ). 3, if no gear is shifted, the control edges 24 and 42 only overlap by a small distance a (for example 0.1 to 0.5 mm). In Fig. 3, this distance a is drawn larger than it really is, only for the purpose of illustration. The same coverage is also provided on the other control edge pairs.
  • the space 18 in which the servo control is housed is closed off from the gear oil space.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Gear-Shifting Mechanisms (AREA)

Abstract

Une boîte de vitesses étagée à changement assisté comporte sur au moins deux arbres de transmission à côté l'un de l'autre plusieurs roues dentées qui sont engagées par groupes continuellement. Le passage des vitesses se fait grâce à la formation, respectivement la disparition de liaisons par forme entre diverses roues dentées et l'arbre de transmission respectif au moyen d'un manchon coulissant (39) et d'un dispositif de synchronisation par frottement (311). Un montage de piston et de cylindre (6, 8) sur lequel peut agir un servo milieu sert à déplacer chaque manchon coulissant. La commande de l'amenée du servo milieu est effectuée grâce à une vanne-pilote (9, 12). Cette dernière se compose d'une tige de changement de vitesse (12) parallèle à la direction de déplacement du piston (6) et d'une tête de vanne (9) entourant la tige de changement de vitesse et fixée au piston (6). Les conduites de servo milieu sont disposées de telle manière que le piston (6) suit la direction de déplacement de la tige de changement de vitesse (12).
EP19850902513 1984-05-11 1985-05-09 Boite de vitesses etagee a changement assiste, en particulier pour vehicules a moteur Withdrawn EP0181897A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3417473 1984-05-11
DE19843417473 DE3417473A1 (de) 1984-05-11 1984-05-11 Servogeschaltetes stufenschaltgetriebe, insbesondere fuer kraftfahrzeuge

Publications (1)

Publication Number Publication Date
EP0181897A1 true EP0181897A1 (fr) 1986-05-28

Family

ID=6235560

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19850902513 Withdrawn EP0181897A1 (fr) 1984-05-11 1985-05-09 Boite de vitesses etagee a changement assiste, en particulier pour vehicules a moteur

Country Status (4)

Country Link
EP (1) EP0181897A1 (fr)
JP (1) JPS61502776A (fr)
DE (1) DE3417473A1 (fr)
WO (1) WO1985005331A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6000294A (en) * 1997-11-15 1999-12-14 Eaton Corporation System and method for fluid assisted shifting of mechanical transmissions
DE19756637A1 (de) 1997-12-19 1999-06-24 Zahnradfabrik Friedrichshafen Schalteinrichtung
DE19756639A1 (de) * 1997-12-19 1999-06-24 Zahnradfabrik Friedrichshafen Schalteinrichtung
DE19756638A1 (de) * 1997-12-19 1999-06-24 Zahnradfabrik Friedrichshafen Schalteinrichtung
DE102008015173B4 (de) 2008-03-20 2023-06-01 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Fahrzeuggetriebe

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB854079A (en) * 1957-12-24 1960-11-16 Clark Equipment Co Power gear-shifting mechanism
DE1917368C3 (de) * 1968-04-26 1974-07-18 Tatra, N.P., Nesseldorf (Tschechoslowakei) Mit Druckluft arbeitende Hilfskraft-Schaltvorrichtung für synchronisierte Wechselgetriebe von Kraftfahrzeugen
ZA836871B (en) * 1982-09-16 1984-06-27 Teleflex Morse Ltd Power assistance control device
DE3410802A1 (de) * 1983-04-07 1984-10-11 Steyr-Daimler-Puch Ag, Wien Schaltvorrichtung fuer wechselgetriebe von nutzfahrzeugen

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8505331A1 *

Also Published As

Publication number Publication date
WO1985005331A1 (fr) 1985-12-05
JPS61502776A (ja) 1986-11-27
DE3417473A1 (de) 1985-11-14

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Inventor name: KLAUE, HERMANN