Device for filtering vibrations

An inertial deflector (1, 101, 201, 301) for a motor vehicle transmission system, the inertial deflector comprising:

• a support member (7, 107, 207, 307) intended to be associated with an element (3, 203) of the transmission system and to be driven rotationally around an axis X, the support member (7, 107, 207, 307) including a rim zone (23, 130, 342);
• an inertia mass (8, 108, 208, 308) mounted rotationally movably on the support member (7, 107, 207, 307) around the axis X, the inertia mass (8, 108, 208, 308) including a recess (22, 122, 222, 338) therein;
• and
• helical springs (9, 109, 209, 309) arranged along a circumferential direction and elastically rotationally coupling the support member (7, 107, 207, 307) and the inertia mass (8, 108, 208, 308);
• at least one of the helical springs (9, 109, 209, 309) disposed in the recess (22, 122, 222, 338) between the inertia mass (8, 108, 208, 309) and the rim zone (23, 130, 342) of the support member (7, 107, 207, 307);
• the recess and the rim zone being configured with respect to one another to retain the at least one of the helical springs in the recess (22, 122, 222, 338);
• each of the helical springs (9) interposed circumferentially between two first abutment elements (24a, 24b) rotationally integral with the inertia mass (8) and between two second abutment elements (26) rotationally integral with the support member (7);
• each of the two first abutment elements (24a, 24b) includes a pair of axially oriented abutment pins spaced radially from one another and press-fitted into a bore (25) provided in the inertia mass (8);
• each of the two second abutment elements is an abutment tab (26) having an axial orientation and arranged radially between the two abutment pins of one of the pairs of the abutment pins.