Speed change apparatus of vehicle

1. A speed change apparatus of a vehicle, the speed change apparatus comprising:

a gear transmission;

a shift lever device arranged in a zone where an operation thereof is achievable from a driver's seat; and

an operation force transmission mechanism for transmitting an operation force of the shift lever device to the gear transmission;

wherein the gear transmission includes:

a shift mechanism operated by the operation force so as to switch the gear transmission between a plurality of shift positions; and

a plurality of detent mechanisms for positioning and holding the shift mechanism at each shift position, and

wherein each of the detent mechanisms includes:

a plurality of recesses formed in a movable member of the shift mechanism and corresponding respectively to the shift positions; and

a detent member in a case member for supporting the movable member, the detent member being configured to engage with each recess by an elastic member.

2. The speed change apparatus according to claim 1 , wherein:

the movable member of the shift mechanism is a shift shaft supported by the case member so as to be movable in an axial direction of the shift shaft, the shift shaft having opposing side portions along the axial direction of the shift shaft, and

the plurality of detent mechanisms are arranged at least in both side portions in the axial direction of the shift shaft.

3. The speed change apparatus according to claim 1 , wherein:

the movable member of the shift mechanism is a shift shaft supported by the case member so as to be movable in an axial direction of the shift shaft, and

a shift fork is supported by the shift shaft while the detent mechanisms are arranged on both sides of the shift fork in the axial direction.

4. The speed change apparatus according to claim 1 , wherein:

the movable member of the shift mechanism is a shift shaft supported by the case member so as to be movable in the axial direction, and

the detent members of the plurality of detent mechanisms are arranged approximately in the same phase in the circumferential direction of the shift shaft.

5. The speed change apparatus according to claim 2 , wherein:

the plurality of detent members are arranged on an upper side of the shift shaft.

6. The speed change apparatus according to claim 2 , wherein:

the elastic member of each of the detent mechanisms biases each detent member with an elastic load different from each other.

7. The speed change apparatus according to claim 1 , wherein:

the shift lever device includes:

a shift lever turnable about a lever pivot; and

a shift panel having a shift slot of approximately straight line shape where the shift lever passes.