Machine element or mechanism – Gearing – Interchangeably locked
Patent
1997-12-29
1999-07-13
Ta, Khoi Q.
Machine element or mechanism
Gearing
Interchangeably locked
7447326, F16H 6330
Patent
active
059211369
DESCRIPTION:
BRIEF SUMMARY
The invention is based on a shifting arrangement for a manual transmission according to the type of the main claim.
From German Patent Document DE-42 05 671 A1, a manual transmission is known in the case of which individual transmission gears are shifted by the interaction of several pairs of gear wheels (range shifting). For the shifting operation, the controlling of two synchronizing operations is required. In order to be able to carry out the actual shifting operation in as brief a time as possible, the two synchronizing operations should take place as simultaneously as possible.
From European Patent Document EP 0 547 007 A1, a shifting arrangement is known in the case of which the shifting elements (synchronizing clutches) of a manual transmission are moved by way of shift forks which, in turn, are displaced by a rotationally moved shift roller. For this purpose, a guiding arm of the shift fork is moved in a guideway of the shift roller. By the interaction of the guiding arm and the guideway, the rotational movement of the shift roller is changed into an axial displacement of the shift fork. Although, in the case of a shifting arrangement of this type, several shift forks of the manual transmission are guided in guideways of the shift rollers extending side-by-side and are moved by them, a simultaneous moving of two shift forks and therefore of two synchronizing clutches is not easily possible. Since, because of component and manufacturing tolerances, the control paths of the synchronizing clutches and shift forks are not completely identical, it may happen that one synchronizing clutch is already completely engaged while the other has not yet covered the whole control path. Because of the narrow guiding of the guiding arms in the guideways which is required for a precise control, a tolerance compensation is not possible.
The invention is therefore based on the object of developing a shifting operating for a manual transmission in which two shifting elements (synchronizing clutches) must be moved simultaneously for the shifting of at least one transmission gear. In this case, the shifting operation is to be carried out in a secure manner and the path differences during the controlling of the individual shifting elements occurring because of component and manufacturing tolerances are to be compensated.
According to the invention, this object is achieved by means of the characterizing features of the main claim. By placing the shifting paths on at least two separate rotor elements, between which the compensation element is arranged, a sufficient separation of the two individual shifting operations is possible because the rigid coupling of the shifting elements to be moved is eliminated. Because of the compensation element between the two separate rotor elements, a path compensation is possible which compensates the different operating paths of the two shifting elements.
The shifting arrangement can be manufactured in a particularly simple manner and with low component expenditures if the at least two separate rotor elements are guided on a common shaft and are moved by it.
The compensation of the different control paths of the two shifting elements to be controlled simultaneously is permitted in a particularly simple manner if one of the two rotor elements is non-rotatably but axially displaceably arranged on the shifting shaft and the compensation element arranged between the rotor elements is a spring element. This, on the one hand, permits a continued rotation of the axially fixed rotor element or of the shifting shaft if the individual shifting operation controlled by means of the axially displaceable rotor element has already been carried out. On the other hand, because of the axial displaceability of the one rotor element, the individual shifting operation carried out therewith can be completed if the second individual shifting operation has already been carried out. The remaining path of the shifting element (synchronizing clutch), which is required for the control operation, can be followed by th
REFERENCES:
patent: 1500878 (1924-07-01), Kruchten
patent: 2416154 (1947-02-01), Chilton
patent: 2507640 (1950-05-01), MacDonald
patent: 2593416 (1952-04-01), Dawson
patent: 5477742 (1995-12-01), Burger
Dr. Ing. h.c.F. Porsche AG
Ta Khoi Q.
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