Reverse-drive blocking latch for an automotive transmission
AssigneeHonda Giken Kogyo Kabushiki Kaisha
InventorsSatoru Kudo, Kiyokazu Ohkubo, Hiroshi Nakayama
Life of this patent
Estimating the term…
Abstract
An automatic latch for preventing inadvertent shifting of a manually controlled automotive transmission into reverse drive condition from a forward drive condition, includes a latch member which is moved into an operative blocking position upon the movement of a gear shift lever in one direction to engage a forward drive gear and which is moved out of its blocking position upon return of the gear shift lever to a neutral position, the latch, when in an operative position, blocking movement of the gear shift lever directly from engagement of said forward drive gear to engagement of a reverse drive gear.
Claims13
A reverse drive blocking latch device for an automotive transmission of the type including a gear shift lever and a linkage for converting movements of the gear shift lever into corresponding movements of gear shift forks of the transmission, said latch device comprising:
- a latch member positioned in operative relationship with a fork shift member of said linkage, said latch member being supported for movement between two alternative positions;
- a projection carried by said fork shift member for cooperation with said latch member when said fork shift member is in a position to effect alternative engagement of a forward drive gear and a reverse drive gear of the transmission;
- said latch member including a projection which is engaged by said projection on said fork shift member in movement of said fork shift member in a direction to engage said forward drive gear and which moves said latch member to one of said alternative positions, said latch member further including a lock claw which is positioned in the path of movement of said fork shift member projection when said latch member is in said one position to restrict reverse movement of said fork shift member and inhibit engagement of said reverse drive gear;
- and
- cooperating cam surfaces of said latch member and fork shift member for returning said latch member to the other of its positions upon return of said fork shift member to an intermediate neutral position.
An apparatus for preventing an incorrect shifting into reverse drive gear of an automotive transmission, the transmission including a gear shift lever and a linkage for converting movement of the lever into corresponding movements of gear shift forks of the transmission, the shift lever being shiftable between a central neutral position and at least one selection position and between the selection position and either a forward gear position on one side of the selection position or a reverse gear position on the other side of the selection position;
- said apparatus comprising:
- a projection member connected to said linkage;
- a latch member positioned in operative relationship with said linkage and being turnable between a lock position and an unlock position;
- a lock claw on said latch member positioned such that when said latch member is in said lock position, said lock claw is in a path of travel of said projection member preventing said linkage and said shift lever from moving to said reverse gear position;
- operation cam means on said latch member and said projection member for turning said latch member from said unlock position to said lock position when said shift lever is shift-operated from said selection position to said forward gear position;
- and
- release cam means on said latch member and said projection member for turning said latch member from said lock position to said unlock position when said shift lever is shift-operated from said selection position to said neutral position.
Dependencies are inferred from the claim text.