Preload constant mesh gearbox

A method for control of a gear system with at least one gear-wheel provided about a shaft and the or each gear-wheel being provided with means for actuable engagement there between in both rotational and counter-rotational directions, such that engagement of the means for actuable engagement of the or each gear wheel in both the rotational and counter-rotational directions causes the or each gear-wheel to rotate in conjunction with the shaft and prevents such from counter-rotating relative to the shaft, disengagement of the means for actuable engagement of the or each gear-wheel in both the rotational and counter-rotational directions allows the or each gear-wheel to rotate independently of the shaft and counter-rotate relative to the shaft, engagement of the means for actual engagement in the rotational direction and disengagement of the means for actual engagement in the counter-rotational direction of the or each gear wheel causes such to rotate in conjunction with the shaft and allows such to counter rotate relative to the shaft, and engagement of the means for actual engagement in the counter-rotational direction and disengagement of the means for actual engagement in the rotational direction of the or each gear wheel allows such to rotate relative to the shaft, but prevent such from counter rotating relative to the shaft;

• the means for actuable engagement is provided in the form of at least one pair of pawl members comprising forward and reverse pawl members provided in the shaft or in the or each gear-wheel, wherein the forward pawl member is adapted to engage a leading surface of a substantially complementary recess in an opposed surface positively during rotation of that opposed surface with respect to the pawl member, and the reverse pawl member is adapted to engage a trailing surface of a substantially complementary recess in an opposed surface positively during rotation of that opposed surface with respect to the pawl member;
• the forward and reverse pawl members are caused to engage the complementary recesses at least in part by magnetic means;
• the method for control characterized, when changing up a gear, by the steps of:
• calling for a change in gear;
• disengaging the means for actuable engagement in the forward direction with the higher gear;
• engaging the means for actuable engagement in the forward direction with the higher gear;
• disengaging the means for actuable engagement in the forward direction from the lower gear or at least allowing the means for actuable engagement to disengage therefrom of their own accord;
• and
• engaging the means for actuable engagement in the reverse direction with higher gear.

A method for control of a gear system characterized by at least one gear-wheel provided about a shaft and the or each gear-wheel being provided with means for actuable engagement there between in both rotational and counter-rotational directions, such that engagement of the means for actuable engagement of the or each gear wheel in both the rotational and counter-rotational directions causes the or each gear-wheel to rotate in conjunction with the shaft and prevents such from counter-rotating relative to the shaft, disengagement of the means for actuable engagement of the or each gear-wheel in both the rotational and counter-rotational directions allows the or each gear-wheel to rotate independently of the shaft and counter-rotate relative to the shaft, engagement of the means for actual engagement in the rotational direction and disengagement of the means for actual engagement in the counter-rotational direction of the or each gear wheel causes such to rotate in conjunction with the shaft and allows such to counter rotate relative to the shaft, and engagement of the means for actual engagement in the counter-rotational direction and disengagement of the means for actual engagement in the rotational direction of the or each gear wheel allows such to rotate relative to the shaft, but prevent such from counter rotating relative to the shaft;

• the means for actuable engagement is provided in the form of at least one pair of bawl members comprising forward and reverse pawl members provided in the shaft or in the or each gear-wheel, wherein the forward pawl member is adapted to engage a leading surface of a substantially complementary recess in an opposed surface positively during rotation of that opposed surface with respect to the pawl member, and the reverse pawl member is adapted to engage a trailing surface of a substantially complementary recess in an opposed surface positively during rotation of that opposed surface with respect to the pawl member;
• the forward and reverse pawl members are caused to engage the complementary recesses at least in part by magnetic means;
• the method for control being further characterized, when changing down a gear under deceleration or overrun, by the steps of:
• calling for a change in gear;
• disengaging the means for actuable engagement in the forward direction from the higher gear;
• engaging the means for actuable engagement in the reverse direction with the lower gear;
• disengaging the means for actuable engagement in the reverse direction from higher gear or at least allowing the means for actuable engagement in the reverse direction to disengage therefrom of their own accord;
• and
• engaging the means for actuable engagement in the forward direction with the lower gear.

A method for control of a gear system characterized by at least one gear-wheel provided about a shaft and the or each gear-wheel being provided with means for actuable engagement there between in both rotational and counter-rotational directions, such that engagement of the means for actuable engagement of the or each gear wheel in both the rotational and counter-rotational directions causes the or each gear-wheel to rotate in conjunction with the shaft and prevents such from counter-rotating relative to the shaft, disengagement of the means for actuable engagement of the or each gear-wheel in both the rotational and counter-rotational directions allows the or each gear-wheel to rotate independently of the shaft and counter-rotate relative to the shaft, engagement of the means for actual engagement in the rotational direction and disengagement of the means for actual engagement in the counter-rotational direction of the or each gear wheel causes such to rotate in conjunction with the shaft and allows such to counter rotate relative to the shaft, and engagement of the means for actual engagement in the counter-rotational direction and disengagement of the means for actual engagement in the rotational direction of the or each gear wheel allows such to rotate relative to the shaft, but prevent such from counter rotating relative to the shaft;

• the means for actuable engagement is provided in the form of at least one pair of pawl members comprising forward and reverse pawl members provided in the shaft or in the or each gear-wheel, wherein the forward pawl member is adapted to engage a leading surface of a substantially complementary recess in an opposed surface positively during rotation of that opposed surface with respect to the pawl member, and the reverse pawl member is adapted to engage a trailing surface of a substantially complementary recess in an opposed surface positively during rotation of that opposed surface with respect to the pawl member;
• the forward and reverse pawl members are caused to engage the complementary recesses at least in part by magnetic means;
• the method for control being characterized when changing down a gear under acceleration, by the steps of:
• calling for a change in gear;
• disengaging the means for actuable engagement in the reverse direction from the higher gear while momentarily cutting the power to the gear system, for example by means of a clutch or control of engine sparking or cutting the fuel supply or other means of torque modulation;
• disengaging the means for actuable engagement in the forward and reverse directions from the higher gear;
• increasing the engine speed;
• and
• engaging the means for actuable engagement in the forward and reverse directions with the lower gear.

A method for control of a gear system characterized by at least one gear-wheel provided about a shaft and the or each gear-wheel being provided with means for actuable engagement there between in both rotational and counter-rotational directions, such that engagement of the means for actuable engagement of the or each gear wheel in both the rotational and counter-rotational directions causes the or each gear-wheel to rotate in conjunction with the shaft and prevents such from counter-rotating relative to the shaft, disengagement of the means for actuable engagement of the or each gear-wheel in both the rotational and counter-rotational directions allows the or each gear-wheel to rotate independently of the shaft and counter-rotate relative to the shaft, engagement of the means for actual engagement in the rotational direction and disengagement of the means for actual engagement in the counter-rotational direction of the or each gear wheel causes such to rotate in conjunction with the shaft and allows such to counter rotate relative to the shaft, and engagement of the means for actual engagement in the counter-rotational direction and disengagement of the means for actual engagement in the rotational direction of the or each gear wheel allows such to rotate relative to the shaft, but prevent such from counter rotating relative to the shaft;

• the means for actuable engagement is provided in the form of at least one pair of pawl members comprising forward and reverse pawl members provided in the shaft or in the or each gear-wheel, wherein the forward pawl member is adapted to engage a leading surface of a substantially complementary recess in an opposed surface positively during rotation of that opposed surface with respect to the pawl member, and the reverse pawl member is adapted to engage a trailing surface of a substantially complementary recess in an opposed surface positively during rotation of that opposed surface with respect to the pawl member;
• the forward and reverse pawl members are caused to engage the complementary recesses at least in part by magnetic means;
• the method for control being further characterized, when changing down a gear under deceleration or overrun, by the steps of:
• calling for a change in gear;
• disengaging the forward pawls of the higher gear;
• engaging the reverse pawls of the lower gear;
• disengaging the reverse pawls of the higher gear or at least allowing the forward pawls of the higher gear to disengage on their own accord;
• and
• engaging the forward pawls of the lower gear.

A method for control of a gear system characterized by at least one gear-wheel provided about a shaft and the or each gear-wheel being provided with means for actuable engagement there between in both rotational and counter-rotational directions, such that engagement of the means for actuable engagement of the or each gear wheel in both the rotational and counter-rotational directions causes the or each gear-wheel to rotate in conjunction with the shaft and prevents such from counter-rotating relative to the shaft, disengagement of the means for actuable engagement of the or each gear-wheel in both the rotational and counter-rotational directions allows the or each gear-wheel to rotate independently of the shaft and counter-rotate relative to the shaft, engagement of the means for actual engagement in the rotational direction and disengagement of the means for actual engagement in the counter-rotational direction of the or each gear wheel causes such to rotate in conjunction with the shaft and allows such to counter rotate relative to the shaft, and engagement of the means for actual engagement in the counter-rotational direction and disengagement of the means for actual engagement in the rotational direction of the or each gear wheel allows such to rotate relative to the shaft, but prevent such from counter rotating relative to the shaft;

• the means for actuable engagement is provided in the form of at least one pair of pawl members comprising forward and reverse pawl members provided in the shaft or in the or each gear-wheel, wherein the forward pawl member is adapted to engage a leading surface of a substantially complementary recess in an opposed surface positively during rotation of that opposed surface with respect to the pawl member, and the reverse pawl member is adapted to engage a trailing surface of a substantially complementary recess in an opposed surface positively during rotation of that opposed surface with respect to the pawl member;
• the forward and reverse pawl members are caused to engage the complementary recesses at least in part by magnetic means;
• the method for control being characterized, when changing up a gear, by the steps of:
• calling for a change in gear;
• disengaging the reverse pawls of the lower gear;
• engaging the forward pawls of the higher gear;
• disengaging the forward pawls of the lower gear or at least allowing the forward pawls of the lower gear to disengage on their own accord;
• and
• engaging the reverse pawls of the higher gear.

A method for control of a gear system characterized by at least one gear-wheel provided about a shaft and the or each gear-wheel being provided with means for actuable engagement there between in both rotational and counter-rotational directions, such that engagement of the means for actuable engagement of the or each gear wheel in both the rotational and counter-rotational directions causes the or each gear-wheel to rotate in conjunction with the shaft and prevents such from counter-rotating relative to the shaft, disengagement of the means for actuable engagement of the or each gear-wheel in both the rotational and counter-rotational directions allows the or each gear-wheel to rotate independently of the shaft and counter-rotate relative to the shaft, engagement of the means for actual engagement in the rotational direction and disengagement of the means for actual engagement in the counter-rotational direction of the or each gear wheel causes such to rotate in conjunction with the shaft and allows such to counter rotate relative to the shaft, and engagement of the means for actual engagement in the counter-rotational direction and disengagement of the means for actual engagement in the rotational direction of the or each gear wheel allows such to rotate relative to the shaft, but prevent such from counter rotating relative to the shaft;

• the means for actuable engagement is provided in the form of at least one pair of pawl members comprising forward and reverse pawl members provided in the shaft or in the or each gear-wheel, wherein the forward pawl member is adapted to engage a leading surface of a substantially complementary recess in an opposed surface positively during rotation of that opposed surface with respect to the pawl member, and the reverse pawl member is adapted to engage a trailing surface of a substantially complementary recess in an opposed surface positively during rotation of that opposed surface with respect to the pawl member;
• the forward and reverse pawl members are caused to engage the complementary recesses at least in part by magnetic means;
• the method for control being characterized, when changing down a gear under acceleration, by the steps of:
• calling for a change in gear;
• disengaging the reverse pawls of the higher gear while momentarily cutting the power to the gear system, for example by means of a clutch or control of engine sparking or cutting the fuel supply or the means of torque modulation;
• disengaging the forward and reverse pawls of the higher gear;
• increasing the engine speed;
• and
• engaging the forward and reverse pawls of the lower gear.