Machine element or mechanism – Gearing – Interchangeably locked
Patent
1998-07-08
2000-02-01
Wright, Dirk
Machine element or mechanism
Gearing
Interchangeably locked
74325, 74335, 743375, 192 4891, 192 93R, F16H 6330, F16H 308
Patent
active
060190108
DESCRIPTION:
BRIEF SUMMARY
This invention relates to gear-selection mechanisms.
The invention is concerned especially, though not exclusively, with gear-selection mechanisms for motor-vehicle gearboxes.
BACKGROUND OF THE INVENTION
Gear selection in motor-vehicle gearboxes is generally carried out by moving selector rings axially between the gears on the mainshaft of the gearbox (the selector rings may have other than a truly ring configuration, for example that of a sleeve or boss, but the common term "ring" will be used herein). These movements are brought about through selector forks which extend to the selector rings from outside the compass of the gears and which are caused to slide parallel to the mainshaft in dependence upon which of the gears is to be selected. The selector forks draw the selector rings along the mainshaft to engage and disengage the gears, and whereas this known form of selector mechanism, is generally satisfactory, it does have disadvantages, especially in the context of competition motoring, where precision gear-changing is to be achieved.
SUMMARY OF THE INVENTION
It is one of the objects of the present invention to provide a form of gear-selection mechanism that has advantage over the known form referred to above in relation to the achievement of precision gear-changing.
According to the present invention there is provided a gear-selection mechanism in which a selector ring is carried on a shaft for movement axially of the shaft in effecting engagement or disengagement of one or more gears of a gearbox, wherein said movement results from force exerted on the ring from longitudinal displacement of an elongate member that extends transversely with respect to the shaft.
The mechanism of the present invention may include a part which is arranged for movement substantially parallel to the shaft and which engages the ring to move the ring in effecting said engagement or disengagement, and in these circumstances said elongate member may bear upon an inclined surface of this part such that longitudinal displacement of said member moves said part and with it the ring axially of the shaft.
The elongate member may be one of a pair of elongate members which extend transversely with respect to the shaft, longitudinal displacement of the two members of the pair resulting in forces exerted on the ring at substantially diametrically-opposite locations of the ring in the same, one direction substantially parallel to the shaft. In particular, the elongate members may be rods which bear on inclined faces of respective blocks that engage the ring at said locations. Each rod may bear on a first of two oppositely-inclined faces of its respective block, and in this case a second pair of rods may extend transversely with respect to the shaft to bear on the second inclined faces of the respective blocks such that longitudinal displacement of the two rods of the second pair results in forces exerted on the ring at said locations in the direction opposite to said one direction.
According to a feature of the present invention there is provided a gearbox in which selection as between two gears of a pair of gears on a shaft is carried out by selective movement of a selector ring axially of the shaft into engagement with one or the other of the gears in dependence upon the direction of its movement through a neutral position in which it is disengaged from both gears, wherein the axial movement of the selector ring in one direction is carried out by force exerted on the ring from longitudinal displacement of the two rods of a first pair of rods that extend inwardly towards the shaft between the gears, and in the other direction by force exerted on the ring from longitudinal displacement of a second pair of rods that extend inwardly towards the shaft between the gears.
The ring may be engaged at substantially diametrically-opposite locations by two blocks which are arranged to slide substantially parallel to the shaft for moving the ring axially as aforesaid. Each block may have first and second oppositely-inclined faces, and indiv
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Kwon Peter T.
Lucking Jeffrey Robert
Stokoe Raymond Martin
Wright Dirk
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