Machine element or mechanism – Control lever and linkage systems – Multiple controlled elements
Patent
1986-08-18
1988-01-05
Herrmann, Allan D.
Machine element or mechanism
Control lever and linkage systems
Multiple controlled elements
G05G 912
Patent
active
047167793
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a gear-shift device for variable transmissions.
BACKGROUND OF THE INVENTION
According to their various utilizations, variable transmissions are developed for several gear ratios, for instance in a so-called hill-climbing speed type, wherein the highest speed has a gear ratio of 1.0, and, if chosen, also in a high-speed construction type with an overdrive and a gear ratio for instance of 0.79, for the highest speed. In order to build such variants, the gear-shift devices have to be adjusted. In the one case, for a direct transmission to the gearing at a gear ratio of 1, the clutch sleeve has to be shifted in direction toward the left, while in the other case it has to be shifted in the opposite direction. The shifting diagram for the driver, however, has to remain unchanged, and for this purpose, a reversal in the gear-shift device becomes necessary in the transmission.
It is known to support the shift rocking arm in question not like the other shift rocking arms, which are pivoted between the slide crank and the engagement point in the shift rail, within the housing, so that when actuated, a reversal in the direction of the clutch sleeve results, but to provide for the support of the shift rocking arm at one end thereof and to arrange the slide crank between the engagement point in the shift rail and this support point. As a result, in spite of the reversal in the clutch sleeve, with respect to the other clutch sleeves the shift direction for the driver, at the manual shift lever, stays the same. But it is not always possible to put into practice this relatively simple modification, because this way the required shift path for the clutch sleeve can not be achieved unless the support point for the shift rocking arm is located outside the transmission housing because of the length of the rocker arm.
Therefore, it is already known to use this type of a shift rocker arm and additionally to increase the shift path in the area of the shift rails.
In addition to two new swing bolts and a new considerably bigger shift rocking arm, the arrangements in the area of the shift rail are quite complicated in construction and assembly.
OBJECT OF THE INVENTION
It is therefore the object of the present invention to provide an improved gear-shift device in which the reversal of the direction of movement of the clutch sleeve with respect to the other clutch sleeves of the transmission can be achieved with simple means and, as a result, with reduced cost.
SUMMARY OF THE INVENTION
This object is attained by providing a simple reversing lever, which can even be manufactured by stamping, between the shift rail and a shift rocker arm, basically having the same size, the sought direction change is achieved, whereby the supports of the shift rocker arm also remain unchanged within the housing.
In a preferred embodiment, it is only necessary to provide next to the reversing lever one additional swing bolt in the housing and an entrainment pin between the shift rocker arm and the reversing lever, in order to achieve not only a reversal of the direction of movement of the clutch sleeve with respect to other sleeves of the transmission, but also a sufficient shift path for the clutch sleeve to actuate the shifting coupling. The simple entrainment pin on one of the parts is easy to manufacture and, in certain cases can be even shaped from the reversing lever, for instance by non-cutting forming. If the support of the reversing lever on a pivot bolt is done through a fork, which is formed at an end of the reversing lever, this is not only very simple, but also produces a motion of sufficient length to shift gears.
A gear-shift device is known from German Pat. No. 29 35 590, wherein for the reversal of the shift lever motion at one speed a reversing lever is provided, so that with each gearshift bar in each direction one speed can be shifted, although in the shifting diagram they are arranged in the same direction. In this gear-shift device, in principle, for the shifting of
REFERENCES:
patent: 1328062 (1920-01-01), Stewart
patent: 2489735 (1949-11-01), Zancan
patent: 4228693 (1980-10-01), Kelbel
patent: 4466305 (1984-08-01), Hiraiwa et al.
patent: 4476738 (1984-10-01), Haga et al.
Dubno Herbert
Herrmann Allan D.
Lianides Ronald
Ross Karl F.
Zahnradfabrik Friedrichshafen AG
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