Machine element or mechanism – Control lever and linkage systems – Multiple controlled elements
Patent
1987-08-04
1989-01-31
Staab, Lawrence
Machine element or mechanism
Control lever and linkage systems
Multiple controlled elements
G05G 510
Patent
active
048007722
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
It has been known to make provision in the case of gear-change gearings for their protection to insure that always only one gear is engaged. Thus, only one of the control or shifting rods which are in connection or in active connection for the shifting of gears or shift couplings with shifting forks or selector forks, is shifted out of the neutral position while the remaining control rods assigned to the gears (not shifted) of the other gates are locked in the neutral position.
The best known locking arrangements consist of the control rods provided with stop grooves or bores with locking bodies being under the force of springs and disposed transversely thereto in bores in the gear housing. Such arrangements, however, make sense only when the control rods, as can be gathered from the German AS No. 10 16 997 or the German Utility Patent No. 81 22 31.8, lie relatively close together in one plane.
In the case of modern gearings wherein the control rods are disposed according to their main function and thus in the upper gear space, it has also already been known--ZF-Synchroma Gearing, pages 5-16 (G 10 48 R-KB 11/83 d) FIG. 39, to use a locking plate in a locking arrangement. With such a locking plate, however, it is possible to lock only maximally two additional control rods by one control rod which will not be sufficient for gearings having more gears which are not to be engaged or shifted with an HH gearing.
SUMMARY OF THE INVENTION
Therefore, it is the task of the invention to further develop a locking arrangement wherein more than two gates can be locked.
While the locking plate according to the status of the prior art is only shifted during the change of the gates, the locking plate according to the invention may be shifted or swiveled around a rotary point or else shifted and swiveled. As a result, it will be possible to lock with one control rod more than two additional control rods by way of the locking plate in the neutral position.
Whenever additionally locking edges are disposed on the locking plate in such a way that they point in the direction toward the swiveling point, the shiftability and swivel movement of the locking plate will be increased and the locking of the control rods not participating in the shifting will be facilitated.
The dimensioning of an elongated hole in the locking plate also serves the same goal, because the extension thereof lies in the direction of the control rods and the guidance on the guide bolt takes place without clearance in the other direction, displaced therefrom by 90.degree., so that it is possible to effect the shifting of the locking plate by way of small paths. In connection with two locking edges per control rod which also act as guide edges, especially a swiveling movement of the locking plate will be facilitated. Except for the contact of the guide bolt in one direction in the elongated hole, no additional contact develops between the holding screws and the locking plate since the latter is shifted and swiveled exclusively always by one control rod and is held by all the remaining control rods in each of the positions assigned to the selected gates.
Whenever the locking plate is made with openings for individual shifting rods, two locking edges per shifting rod may well be arranged, of which one is also to point toward the rotary point. A particularly simple solution will be achieved, whenever the guide bolt is a component of a holding screw, because three holding screws over the entire extent of the locking plate allow a double function of this holding screw to be achieved.
Whenever the locking plate is to be disposed in the area of a housing cover, then instead of the attachment by way of holding screws, the positioning in a recess which is closed by a lid may be a simple solution.
Further details of the invention will be explained on the basis of embodiments by way of examples and drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows the locking arrangement in the gear housing with the locking plate in a front view;
REFERENCES:
patent: 1410116 (1922-03-01), Pomeroy
patent: 1537584 (1925-05-01), Carhart
patent: 1601048 (1926-09-01), Sponable
patent: 1719520 (1929-07-01), Reville
patent: 2748910 (1956-06-01), Klecker
patent: 3292451 (1966-12-01), Jacklin et al.
patent: 4633729 (1987-01-01), Scalisi et al.
patent: 4633730 (1987-01-01), Scalisi et al.
"Repair Instructions for ZF Synchroma Gearing", pp. 1 and 22, date unknown.
Buri Gerhard
Irlbacher Wolfgang
Staab Lawrence
Zahnradfabrik Friedrichshafen AG
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