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US 8,707,814 B2Granted
Shift mechanism, and vehicle equipped therewith
AssigneeYamaha Hatsudoki Kabushiki Kaisha
InventorTetsushi Saitoh
Life of this patent
Estimating the term…
Abstract
A shift mechanism that provides a shift mechanism for enabling smooth gear shifting by a transmission, and a vehicle equipped therewith. With this mechanism, a shift drum, to which shift forks are connected via grooves on an outer periphery, is held every predetermined rotation angle. When differences are produced in the degree of rotation between a third rotating member that rotates by motor rotation and a second rotating member that rotates in accordance with the third rotating member, bias is accumulated in a torsion spring. Bias that is accumulated is released when the rotation angle of the third rotating member equals or exceeds a predetermined angle of rotation, rotating a first rotating member via a second rotating member, and rotating the shift drum quickly.
Claims13
A shift mechanism that moves shift forks connected to a gear of a transmission and changes a gear position of the transmission, the shift mechanism comprising:
- a shift cam that has, on an outer periphery, cam grooves to which the shift forks are connected, and rotates at a predetermined rotation angle and moves the shift forks at a certain rotation angle;
- a cam phase holding section that holds the shift cam at phases determined per the certain rotation angle;
- a rotating section that is provided so as to be able to rotate in forward and reverse directions from a reference rotation position, and rotates and moves the shift cam through the certain rotation angle;
- a transferring section that rotates by section of motor rotation, rotates in one of the forward and reverse directions from the reference rotation position, and, by transferring that rotation to the rotating section, rotates the rotating section;
- a regulating section that, while the transferring section is rotating in one direction in response to the motor rotation, regulates the rotation of the rotating section until the transferring section has reached a predetermined rotation angle, and allows the rotation of the rotating section at or above the certain rotation angle;
- a bias accumulating section that comprises a biasing member that increases bias following an increase in a rotation angle of the transferring section in the one direction;
- and
- an accumulated torque releasing section that, when the rotation angle of the transferring section reaches the predetermined rotation angle, releases the bias accumulated in the bias accumulating section and transfers torque to the transferring section,
- wherein the rotating section makes the shift cam held by the cam phase holding section rotate by the rotation caused by the accumulated torque releasing section.
6 more elements
A vehicle comprising:
- an engine;
- a driving wheel;
- and
- a transmission that transmits torque produced in the engine to the driving wheel at a plurality transmission gear ratio,
- wherein the transmission comprises the shift mechanism comprising:
- a shift cam that has, on an outer periphery, cam grooves to which the shift forks are connected, and rotates at a predetermined rotation angle and moves the shift forks at a certain rotation angle;
- a cam phase holding section that holds the shift cam at phases determined per the certain rotation angle;
- a rotating section that is provided so as to be able to rotate in forward and reverse directions from a reference rotation position, and rotates and moves the shift cam through the certain rotation angle;
- a transferring section that rotates by section of motor rotation, rotates in one of the forward and reverse directions from the reference rotation position, and, by transferring that rotation to the rotating section, rotates the rotating section;
- a regulating section that, while the transferring section is rotating in one direction in response to the motor rotation, regulates the rotation of the rotating section until the transferring section has reached a predetermined rotation angle, and allows the rotation of the rotating section at or above the certain rotation angle;
- a bias accumulating section that comprises a biasing member that increases bias following an increase in a rotation angle of the transferring section in the one direction;
- and
- an accumulated torque releasing section that, when the rotation angle of the transferring section reaches the predetermined rotation angle, releases the bias accumulated in the bias accumulating section and transfers torque to the transferring section,
- wherein the rotating section makes the shift cam held by the cam phase holding section rotate by the rotation caused by the accumulated torque releasing section.
11 more elements
A shift mechanism that moves shift forks connected to a gear of a transmission and changes a gear position of the transmission, the shift mechanism comprising:
- a shift cam that has, on an outer periphery, cam grooves to which the shift forks are connected, and rotates at a predetermined rotation angle and moves the shift forks at a certain rotation angle;
- a cam phase holding section that holds the shift cam at phases determined per the certain rotation angle;
- a rotating section that is provided so as to be able to rotate in forward and reverse directions from a reference rotation position, and rotates and moves the shift cam through the certain rotation angle;
- a transferring section that rotates by section of motor rotation, rotates in one of the forward and reverse directions from the reference rotation position, and, by transferring that rotation to the rotating section, rotates the rotating section;
- a regulating section that, while the transferring section is rotating in one direction in response to the motor rotation, regulates the rotation of the rotating section until the transferring section has reached a predetermined rotation angle, and allows the rotation of the rotating section at or above the certain rotation angle;
- a bias accumulating section that comprises a biasing member that increases bias following an increase in a rotation angle of the transferring section in the one direction;
- and
- an accumulated torque releasing section that, when the rotation angle of the transferring section reaches the predetermined rotation angle, releases the bias accumulated in the bias accumulating section and transfers torque to the transferring section,
- wherein the rotating section rotates due to the released bias, thereby rotating the cam phase holding section, and the cam phase holding section rotates due to the released bias, and the shift cam rotates due to the rotation of the cam phase holding section.
6 more elements
A shift mechanism that moves shift forks connected to a gear of a transmission and changes a gear position of the transmission, the shift mechanism comprising:
- a shift cam that has, on an outer periphery, cam grooves to which the shift forks are connected, and rotates at a predetermined rotation angle and moves the shift forks at a certain rotation angle;
- a cam phase holding section that holds the shift cam at phases determined per the certain rotation angle;
- a rotating section that is provided so as to be able to rotate in forward and reverse directions from a reference rotation position, and rotates and moves the shift cam through the certain rotation angle;
- a transferring section that rotates by section of motor rotation, rotates in one of the forward and reverse directions from the reference rotation position, and, by transferring that rotation to the rotating section, rotates the rotating section;
- a regulating section that, while the transferring section is rotating in one direction in response to the motor rotation, regulates the rotation of the rotating section until the transferring section has reached a predetermined rotation angle, and allows the rotation of the rotating section at or above the certain rotation angle;
- a bias accumulating section that comprises a biasing member that increases bias following an increase in a rotation angle of the transferring section in the one direction;
- and
- an accumulated torque releasing section that, when the rotation angle of the transferring section reaches the predetermined rotation angle, releases the bias accumulated in the bias accumulating section and transfers torque to the transferring section,
- wherein the rotating section and the regulating section form a first ratchet mechanism and a second ratchet mechanism,
- wherein the second ratchet mechanism regulates the rotation of the rotating section until the predetermined rotation angle is reached, and allows the rotation of the rotating section at or above the predetermined rotation angle.
7 more elements
Dependencies are inferred from the claim text.