Arrangement for preventing rattling in a synchronized gearbox

An arrangement for preventing the rattling of a synchronizing ring for an unengaged gearwheel in a synchronized gearbox, comprising:

• the synchronized gearbox including a rotatable shaft, a hub fixed for rotation with the shaft, first and second gearwheels respectively located at opposite axial sides of the hub and mounted for rotation around and with respect to the shaft;
• a synchronizing sleeve around the hub to rotate with the hub and also being axially movable with respect to the hub and along the shaft toward a selected one of the first and second gearwheels, the synchronizing sleeve is for transmitting torque from the shaft to the selected one of the gearwheels toward which the sleeve is moved;
• a first synchronizing ring around the shaft and between the hub and the first gearwheel, a second synchronizing ring around the shaft and between the hub and the second gearwheel, the synchronizing sleeve being movable into engagement with one of the synchronizing rings for pushing that synchronizing ring in the direction toward the respective gearwheel toward which the sleeve is moved;
• a selectively engageable friction connection between each of the first and second gearwheels and the respective first and second synchronizing rings such that the synchronizing sleeve pressing on one of the synchronizing rings makes the frictional connection between that synchronizing ring and the respective gearwheel for causing rotation of that gearwheel;
• each synchronizing ring including blocking means for blocking the movement of the synchronizing sleeve into engagement with the one of the first and second gearwheels toward which the synchronizing sleeve is being moved until the rotation speeds of the respective synchronizing ring and the one gearwheel have been synchronized with the rotation speed of the synchronizing sleeve and the hub, and the blocking means then permitting the synchronizing sleeve to be moved into driving engagement with the one gearwheel toward which the sleeve is being moved for driving the one gearwheel at the rotation speed of the synchronizing sleeve;
• the synchronizing hub including a rim with a first peripheral exterior engaged by the synchronizing sleeve, the hub including a peripheral interior surface which defines a space;
• each synchronizing ring including a portion which extends into the space defined inside the interior surface of the rim of the synchronizing hub, and the portion has a second exterior surface, the second exterior surface and the interior surface of the hub being respectively of such diameters to define an arcuate space between the second exterior surface and the interior surface of the rim of the synchronizing hub;
• radially acting spring clamping elements inserted with prestress in the respective arcuate space between the second exterior surface of each synchronizing ring and the interior surface of the rim of the hub, the clamping elements being shaped, sized and prestressed for holding the respective synchronizing ring in a rotational generally centered prestressed position relative to the rim portion of the synchronizing hub.

An arrangement for preventing the rattling of a synchronizing ring for an unengaged gearwheel in a synchronized gearbox, comprising:

• the synchronized gearbox including a rotatable shaft, a hub fixed for rotation with the shaft, a gearwheel located at one axial side of the hub and mounted for rotation around and with respect to the shaft;
• a synchronizing sleeve around the hub to rotate with the hub and also being axially movable with respect to the hub and along the shaft toward the gearwheel, the synchronizing sleeve is for transmitting torque from the shaft to the gearwheel toward which the sleeve is moved;
• a synchronizing ring around the shaft and between the hub and the gearwheel, the synchronizing sleeve being movable into engagement with the synchronizing ring for pushing the synchronizing ring in the direction toward the gearwheel toward which the sleeve is moved;
• a selectively engageable friction connection between the gearwheel and the synchronizing ring such that the synchronizing sleeve pressing on the synchronizing ring makes the frictional connection between the synchronizing ring and the gearwheel for causing rotation of the gearwheel;
• the synchronizing ring including blocking device to block the movement of the synchronizing sleeve into engagement with the gearwheel toward which the synchronizing sleeve is being moved until the rotation speeds of the synchronizing ring and the gearwheel have been synchronized with the rotation speed of the synchronizing sleeve and the hub, and the blocking device then permitting the synchronizing sleeve to be moved into driving engagement with the gearwheel toward which the sleeve is being moved for driving the gearwheel at the rotation speed of the synchronizing sleeve;
• the synchronizing hub including a rim with a first peripheral exterior engaged by the synchronizing sleeve, the hub including a peripheral interior surface which defines a space;
• the synchronizing ring including a portion which extends into the space defined inside the interior surface of the rim of the synchronizing hub, and the portion has a second exterior surface, the second exterior surface and the interior surface of the hub being respectively of such diameters to define an arcuate space between the second exterior surface and the interior surface of the rim of the synchronizing hub;
• radially acting spring clamping elements inserted with prestress in the respective arcuate space between the second exterior surface of the synchronizing ring and the interior surface of the rim of the hub, the clamping elements being shaped, sized and prestressed for holding the synchronizing ring in a rotational generally centered prestressed position relative to the rim portion of the synchronizing hub.

An arrangement for preventing the rattling of a synchronizing ring for an unengaged gearwheel in a synchronized gearbox, comprising:

• the synchronized gearbox including a rotatable shaft, a hub fixed for rotation with the shaft, first and second gearwheels respectively located at opposite axial sides of the hub and mounted for rotation around and with respect to the shaft;
• a synchronizing sleeve around the hub to rotate with the hub and also being axially movable with respect to the hub and along the shaft toward a selected one of the first and second gearwheels, the synchronizing sleeve is for transmitting torque from the shaft to the selected one of the gearwheels toward which the sleeve is moved;
• a first synchronizing ring around the shaft and between the hub and the first gearwheel, a second synchronizing ring around the shaft and between the hub and the second gearwheel, the synchronizing sleeve being movable into engagement with one of the synchronizing rings for pushing that synchronizing ring in the direction toward the respective gearwheel toward which the sleeve is moved;
• a selectively engageable friction connection between each of the first and second gearwheels and the respective first and second synchronizing rings such that the synchronizing sleeve pressing on one of the synchronizing rings makes the frictional connection between that synchronizing ring and the respective gearwheel for causing rotation of that gearwheel;
• each synchronizing ring including blocking device to block the movement of the synchronizing sleeve into engagement with the one of the first and second gearwheels toward which the synchronizing sleeve is being moved until the rotation speeds of the respective synchronizing ring and the one gearwheel have been synchronized with the rotation speed of the synchronizing sleeve and the hub, and the blocking device then permitting the synchronizing sleeve to be moved into driving engagement with the one gearwheel toward which the sleeve is being moved for driving the one gearwheel at the rotation speed of the synchronizing sleeve;
• the synchronizing hub including a rim with a first peripheral exterior engaged by the synchronizing sleeve, the hub including a peripheral interior surface which defines a space;
• each synchronizing ring including a portion which extends into the space defined inside the interior surface of the rim of the synchronizing hub, and the portion has a second exterior surface, the second exterior surface and the interior surface of the hub being respectively of such diameters to define an arcuate space between the second exterior surface and the interior surface of the rim of the synchronizing hub;
• radially acting spring clamping elements inserted with prestress in the respective arcuate space between the second exterior surface of each synchronizing ring and the interior surface of the rim of the hub, the clamping elements being shaped, sized and prestressed for holding the respective synchronizing ring in a rotational generally centered prestressed position relative to the rim portion of the synchronizing hub.