Torque-damping anti-vibration device

An anti-vibration device for damping torque, designed to couple an engine with a motor vehicle chassis with a view to limiting displacements of the engine in at least a first direction, this coupling device comprising:

• first and second rigid reinforcements, which are designed to be fixed one to the engine and the other to the chassis, the second reinforcement defining a hollow interior space in which the first reinforcement is disposed with a certain amount of clearance in the first direction and in second and third directions perpendicular to one another and to said first direction,
• a first elastomer limiting unit which is bonded onto the second reinforcement and inserted between the first and second reinforcements in order to restrict their relative displacement in the first direction, depending on a first direction corresponding to a displacement to which the engine is subjected when it produces a driving force, the first limiting unit having a first thickness of elastomer in the interior space of the second reinforcement as measured in the first direction,
• and a second elastomer limiting unit which is bonded onto the second reinforcement and inserted between the first and second reinforcements in order to limit their relative displacement in the first direction, depending on a second direction opposite said first direction and corresponding to the displacement to which the engine is subjected when it produces a deceleration, the second limiting unit having a second thickness of elastomer in the interior space of the second reinforcement, measured in the first direction;
• wherein the first reinforcement is of a substantially flat shape in the second and third directions,
• wherein the first reinforcement is simply inserted between the first and second elastomer limiting units without any bonding between the first reinforcement and said first and second limiting units, and
• wherein the first reinforcement is made by moulding and has stops which face in two opposite directions parallel with the third direction and which co-operate with at least one of the first and second elastomer limiting units in order to restrict relative displacements of the first and second reinforcements parallel with the third direction, these stops being offset from one another perpendicularly to said third direction so that, viewed in a projection parallel with this third direction, said stops to not overlap at any point, so that the first reinforcement can be moulded in a two-part mould and de-moulded parallel with the third direction.