Gear shift device

A gearshift device, for gearshift actuation of a multi-speed transmission, comprising:

• a transmission housing;
• a gearshift rod being slidably and rotatably mounted to the transmission housing and having a longitudinal axis, the gearshift rod being slidable along and rotatable about the longitudinal axis;
• a plurality of gearshift mechanisms being movable between a disengaged position and an engaged position;
• each of said gearshift mechanisms having a coupling mechanism for coupling the gearshift mechanism to the gearshift rod, each coupling mechanism being adjustable between a slide position and a drive position such that when the coupling mechanism is in the slide position the gearshift rod is slidable relative to the gearshift mechanism, and when the coupling mechanism is in the drive position the gearshift rod is secured to the gearshift mechanism and translational movement of the gearshift rod along the longitudinal axis causes the corresponding gearshift mechanism to move to one of the engaged and disengaged positions;
• and
• the gearshift mechanisms being gearshift forks rigidly secured to the coupling mechanisms;
• wherein each coupling mechanism comprises:
• a cylindrical basic member which is slidably mounted on the gearshift rod and has a center along the longitudinal axis;
• a longitudinal groove, with a floor provided therein, is provided on an outer surface of the basic member;
• a stop bolt is slidably mounted in the transmission housing and has a first end which abuts against the floor of the longitudinal groove;
• a biasing mechanism biases the first end of the stop bolt against the floor of the longitudinal groove;
• an annular groove is provided on an inner surface of the basic member such that the annular groove intersects the longitudinal groove and forms an aperture in the floor of the longitudinal groove;
• an axially extending groove is provided on an inner surface of the basic member;
• a driving element protrudes from the gearshift rod and is alignable with one of the annular groove and an axially extending grooves, and the driving element is sized and positioned such that when the gearshift rod rotates, the driving element moves within the annular groove, and when the gearshift rod translates, the driving element moves within the axially extending groove;
• when the coupling mechanism is in the drive position, the driving element abuts against a wall of the annular groove and the driving element substantially fills the aperture in the floor of the longitudinal groove to prevent the stop bolt from penetrating into the aperture;
• and
• when the coupling mechanism is in the slide position, the driving element is aligned with the axial groove, the aperture is aligned with the stop bolt, and the biasing mechanism urges the stop bolt into the aperture such that the first end of the stop bolt abuts against the gearshift rod.

A gearshift device, for gearshift actuation of a multi-speed transmission, comprising:

• a transmission housing;
• a gearshift rod being slidably and rotatably mounted to the transmission housing and having a longitudinal axis, the gearshift rod being slidable along and rotatable about the longitudinal axis;
• a plurality of gearshift mechanisms being movable between a disengaged position and an engaged position;
• each of said gearshift mechanisms having a coupling mechanism for coupling the gearshift mechanism to the gearshift rod, each coupling mechanism being adjustable between a slide position and a drive position such that when the coupling mechanism is in the slide position the gearshift rod is slidable relative to the gearshift mechanism, and when the coupling mechanism is in the drive position the gearshift rod is secured to the gearshift mechanism and translational movement of the gearshift rod along the longitudinal axis causes the corresponding gearshift mechanism to move to one of the engaged and disengaged positions;
• and
• the gearshift mechanisms being gearshift levers rotatably mounted to the transmission housing about a second axis which is oriented perpendicular to the longitudinal axis of the gearshift rod;
• wherein each coupling mechanism comprises:
• a cylindrical basic member which is slidably mounted on the gearshift rod and has a center along the longitudinal axis;
• a longitudinal groove, with a floor provided therein, is provided on an outer surface of the basic member;
• a stop bolt is slidably mounted in the transmission housing and has a first end which abuts against the floor of the longitudinal groove;
• a biasing mechanism biases the first end of the stop bolt against the floor of the longitudinal groove;
• an annular groove is provided on an inner surface of the basic member such that the annular groove intersects the longitudinal groove and forms an aperture in the floor of the longitudinal groove;
• an axially extending groove is provided on an inner surface of the basic member;
• a driving element protrudes from the gearshift rod and is alignable with one of the annular groove and the axially extending groove, and the driving element is sized and positioned such that when the gearshift rod rotates the driving element moves within the annular groove, and when the gearshift rod translates the driving element moves within the axially extending groove;
• and
• an intermediate joint is located between the basic member and the gearshift lever.