Tensioner with tensioner lock with projection that includes first and second projection parts

A tensioner for tensioning an endless drive arrangement on an engine, the tensioner comprising:

• a tensioner base that is mounted to be stationary relative to the engine;
• a tensioner arm that is movably mounted to the tensioner base for movement about a tensioner arm axis and which has a tensioner pulley rotatably mounted thereto for rotation about a tensioner pulley axis that is spaced from the tensioner arm axis, wherein the tensioner pulley is positioned for engagement with an endless drive member of the endless drive arrangement;
• a tensioner arm biasing member that is positioned to bias the tensioner arm in a free arm direction;
• and
• a tensioner lock, including:
• a locking feature on one of the tensioner arm and the tensioner base,
• a projection that is movably mounted to the other of the tensioner arm and the tensioner base, and is movable between a locking position and a release position, wherein, in the locking position, the projection cooperates with the locking feature to limit movement of the tensioner arm in the free arm direction past a limit position, and wherein, in the release position, the projection permits movement of the tensioner arm in the free arm direction;
• and
• a projection biasing member that is positioned to urge the projection towards the release position,
• wherein, the projection and the locking feature are positioned such that, when the projection is in the locking position, urging of the tensioner arm in the free arm direction by the tensioner arm biasing member causes a locking force to be applied by the locking feature on the projection to hold the projection in the locking position, and such that, movement of the tensioner arm opposite to the free arm direction releases the locking force so as to permit the projection biasing member to drive the projection to the release position, thereby freeing the tensioner arm to move in the free arm direction,
• wherein the projection includes a first projection part and a second projection part, wherein one of the first and second projection parts includes a recess into which the other of the first and second projection parts extends to hold the first and second projection parts together, wherein the second projection part is engageable with the locking feature to limit movement of the tensioner arm in the free arm direction past the limit position, and wherein the first projection part has a first projection-withdrawal limit surface thereon that is engageable with a second projection-withdrawal limit surface on said other of the tensioner arm and the tensioner base to prevent complete withdrawal of the projection from said other of the tensioner arm and the tensioner base,
• wherein the first projection part includes a first flex arm and a second flex arm, wherein the first flex arm includes a first tab with a first lip surface and the second flex arm includes a second tab with a second lip surface, wherein the first projection-withdrawal limit surface includes the first and second lip surfaces,
• wherein said other of the tensioner arm and the tensioner base has a first pass-through aperture having a first portion, wherein the first and second flex arms are compressible to permit the first projection part to pass through the first portion of the first pass-through aperture,
• wherein the second projection-withdrawal limit surface is positioned at the end of the first portion of the first pass-through aperture, such that, once the first and second tabs have cleared the first portion of the first pass-through aperture, the flex arms expand outwards such that the first projection-withdrawal limit surface is positioned to interact with the second projection-withdrawal limit surface to prevent complete withdrawal of the projection from said other of the tensioner arm and the tensioner base,
• wherein the second projection part is insertable into the first pass-through aperture to connect to the first projection portion.