Gear noise preventing system for manual transmission

Abstract

During a reverse shift operation, in accordance with a select operation performed on a shift lever, a first head (61) that rotates together with a shift select shaft (20) rotates a second head (62) that is supported by a third gear-fourth gear fork shaft (52). A rotational force of the second head (62) is transferred to a third head (63) that is provided integrally onto a fifth gear-sixth gear fork shaft (53) and the fifth gear-sixth gear fork shaft (53) moves in the axial direction. Thus, a synchromesh mechanism operates and the rotation of an input shaft slows down. Then, in accordance with a shift operation performed on the shift lever, the first head (61) retracts from the second head (62) and the operation of the synchromesh mechanism is terminated. During a reverse shift select operation, the synchromesh mechanism for forward gear is operated for a sufficiently long period and by a sufficient amount to reliably prevent gear noise.

Description

technical field [0001] The present invention generally relates to a gear noise prevention system for a manual transmission such as that installed in an automobile. More particularly, the present invention relates to a technique for preventing gear noise from occurring when a manual transmission not equipped with a synchromesh mechanism for reverse gear is shifted into reverse gear. Background technique [0002] Many types of vehicle manual transmissions are not equipped with a synchromesh mechanism for a reverse gear although they are equipped with a synchromesh mechanism for a forward gear, and the reason is as follows. A reverse shift operation for shifting a manual transmission from forward to reverse is typically performed with the clutch disengaged and the vehicle not moving. Therefore, both the reverse drive gear provided on the input shaft of the conversion mechanism and the reverse driven gear provided on the intermediate shaft (which may be referred to as an “outpu...

AI Technical Summary

Problems solved by technology

Therefore, it is difficult for the selector shaft to withstand the reaction force transmitted from the yoke shaft at the time of operating the reverse shift gear noise prevention mechanism at a sufficient level.

That is, since there is a possibility that the select shaft is moved by the reaction force when the reverse switching gear noise prevention mechanism is operated, it is difficult for the select shaft to withstand the above reaction force

Therefore, it is possible that the amount of pre-resistance fork shaft movement will not be large enough to perform the gear noise prevention function (an amount large enough to operate the synchronization mechanism)

Therefore, there is still room to improve reliability

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