Self-preloading shift lever
View Patent ↗An exemplary shift lever includes a mounting assembly, a flexible member coupled to the mounting assembly, and an interface coupled to the flexible member. The flexible member is resilient so as to provide a selected biasing force at a predetermined deformation angle, and flexible enough to elastically deform across a selected angular range. The mounting assembly is configured for connection with the input shaft of a transmission, and the interface is configured for connection with an output of a drive selector.
1. An apparatus comprising:
a transmission having an associated dog clutch;
a rotatable input shaft connected to the dog clutch;
a shift lever having a unitary flexible member extending between first and second ends, the shift lever operably coupled to the input shaft at the first end;
a drive selector operably coupled to the second end of the shift lever; and
wherein the drive selector is movable between first and second positions and the unitary flexible member elastically deforms through a predetermined angle corresponding to the first and second positions when the dog clutch is out of alignment.
2. The apparatus of claim 1 , wherein the unitary flexible member generates a preload on the input shaft when deformed at the predetermined angle.
3. The apparatus of claim 2 , wherein the preload of the unitary flexible member rotates the input shaft when the dog clutch moves into alignment.
4. The apparatus of claim 1 , wherein rotation of a transaxle of the transmission brings the dog clutch into alignment.
5. The apparatus of claim 1 , further comprising an abutment to limit the travel of the second end of the flexible member.
6. The apparatus of claim 1 , wherein the maximum deflection of the flexible member is limited by a pair of abutments.
7. The apparatus of claim 1 , wherein the flexible member is formed from one of a composite, a metal or combinations thereof.
8. The apparatus of claim 1 , wherein the flexible member includes a tapered wall.
9. The apparatus of claim 1 , wherein the flexible member is non-planar in an unloaded natural state.
10. A system comprising:
a vehicle with a transmission having at least two gear outputs;
a dog clutch operable with the transmission, wherein the dog clutch includes two opposing clutch members with a plurality of dogs formed thereon and wherein the transmission can only shift gears when the dogs are aligned;
a rotatable input shaft connected to the dog clutch;
a shift lever having a unitary flexible member extending between first and second ends, the shift lever operably coupled to the input shaft at the first end;
a drive selector operably coupled to the second end of the shift lever; and
wherein the drive selector is movable between first and second positions and the unitary flexible member elastically deforms through a predetermined angle corresponding to the first and second positions when the dogs are misaligned.
11. The system of claim 10 , wherein the at least two gear outputs include a forward gear and a reverse gear.
12. The system of claim 10 , wherein the at least two gear outputs include a neutral gear and a plurality of forward and reverse gears.
13. The system of claim 10 , wherein the elastically deformed flexible member generates a preload torque to rotate the input shaft after the dogs move into alignment.
14. The system of claim 10 , wherein rotation of a transaxle brings the dogs into alignment.
15. The system of claim 10 , wherein the flexible member and an interface is a single molded composite structure.
16. The system of claim 10 , wherein the flexible member includes nonlinear portions in an unloaded natural state.
17. The system of claim 10 , wherein the flexible member includes non-symmetrical portions about at least one imaginary plane extending therethrough in an unloaded natural state.
18. The system of claim 10 , wherein the vehicle includes land based and water based vehicles.
19. A method comprising:
moving a shift lever from a first position to a second position;
deflecting a unitary flexible member in response to the moving when a dog clutch is misaligned;
rotating the transaxle to align the dog clutch;
rotating an input shaft with a preload force of the deflected flexible member after the dog clutch is aligned; and
shifting a transmission into a different gear in response to the rotating of the input shaft.
20. The method of claim 19 , further comprising constraining the deflecting to a maximum predetermined angle.