Speed change control device of vehicular transmission
First Claim
1. A speed change control device of a vehicular transmission in which shift forks for selectively establishing gear trains of a plurality of speed change stages arranged between main shafts transmitted with power from an internal combustion engine and a countershaft connected to drive wheels are engaged with lead grooves formed on an outer periphery of a shift drum, and in which a driving means including an electric motor and rotatably driving the shift drum with power exerted by the electric motor is connected to the shift drum;
- wherein the driving means includes,the electric motor having a rotation axis in a plane orthogonal to an axis of the shift drum;
a barrel cam that rotates about an axis parallel to the electric motor by power transmission from the electric motor and that has a cam groove formed on an outer periphery; and
a transmission rotation member interlocked and coupled to the shift drum so as to be rotatable about an axis orthogonal to the rotation axis of the barrel cam and arranged with a plurality of engagement pins that selectively engages the cam groove.
1 Assignment
0 Petitions
Accused Products
Abstract
A speed change control device for a transmission of an internal combustion engine includes a driving means having an electric motor for rotatably driving a shift drum. The electric motor has a rotation axis orthogonal to an axis of a shift drum. A barrel cam having a cam groove rotates about an axis parallel to that of the electric motor. A transmission rotation member is interlocked and is coupled to the shift drum so as to be rotatable about the axis orthogonal to the rotation axis of the barrel cam. The transmission rotation member is provided with a plurality of engagement pins that selectively engages the cam groove. The resulting configuration allows the electric motor to be disposed inwardly with respect to an outermost side of the body of the internal combustion engine in the direction of the axis of a shift drum and improves the shift accuracy.
37 Citations
20 Claims
-
1. A speed change control device of a vehicular transmission in which shift forks for selectively establishing gear trains of a plurality of speed change stages arranged between main shafts transmitted with power from an internal combustion engine and a countershaft connected to drive wheels are engaged with lead grooves formed on an outer periphery of a shift drum, and in which a driving means including an electric motor and rotatably driving the shift drum with power exerted by the electric motor is connected to the shift drum;
wherein the driving means includes, the electric motor having a rotation axis in a plane orthogonal to an axis of the shift drum; a barrel cam that rotates about an axis parallel to the electric motor by power transmission from the electric motor and that has a cam groove formed on an outer periphery; and a transmission rotation member interlocked and coupled to the shift drum so as to be rotatable about an axis orthogonal to the rotation axis of the barrel cam and arranged with a plurality of engagement pins that selectively engages the cam groove. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
11. A speed change control device of a vehicular transmission in which shift forks for selectively establishing gear trains of a plurality of speed change stages arranged between main shafts transmitted with power from an internal combustion engine and a countershaft connected to drive wheels are engaged with lead grooves formed on an outer periphery of a shift drum, the speed control device comprising:
driving means including; an electric motor having a rotation axis in a plane orthogonal to an axis of the shift drum, the electric motor connected to and rotatably driving the shift drum with power exerted by the electric motor; a barrel cam having a cam groove formed on an outer periphery thereof that rotates about an axis parallel to the electric motor by power transmission from the electric motor; and a transmission rotation member interlocked and coupled to the shift drum so as to be rotatable about an axis orthogonal to the rotation axis of the barrel cam, wherein the transmission rotation member includes multiple engagement pins that selectively engage the cam groove. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
Specification