Multi-disk brake assembly with travel limit pin
A torque tube assembly may comprise a torque tube including a reaction plate and a first travel limit pin coupled to the reaction plate. The first travel limit pin may comprise a shaft portion and a head portion. The first travel limit pin may be configured to limit an axial movement of the reaction plate.
1. A torque tube assembly for a multi-disk brake system including a plurality of friction disks, comprising:
a torque tube comprising a reaction plate, the reaction plate comprising a lip located at a radially outward end of the reaction plate, wherein the lip is configured to extend toward the plurality of friction disks;
a pressure pad coupled to the reaction plate; and
a first travel limit pin extending into the lip of the reaction plate, wherein the first travel limit pin terminates prior to the pressure pad.
2. The torque tube assembly of claim 1 , wherein the first travel limit pin comprises a shaft portion and a head portion.
3. The torque tube assembly of claim 2 , wherein the shaft portion of the first travel limit pin is press fit within an opening in the reaction plate.
4. The torque tube assembly of claim 2 , wherein a surface of the head portion of the first travel limit pin is configured to complement a contour of a wheel wall.
5. The torque tube assembly of claim 2 , wherein an angle between the head portion and the shaft portion of the first travel limit pin is about 90°.
6. The torque tube assembly of claim 1 , further comprising a plurality of travel limit pins spaced circumferentially along the reaction plate, the plurality of travel limit pins including the first travel limit pin.
7. The torque tube assembly of claim 1 , wherein the first travel limit pin is comprised of at least one of:
a first steel alloy comprising, in weight percent, 0.75% to 1.0% Manganese (Mn), 0.40% to 0.70% nickel (Ni), 0.40% to 0.60% chromium (Cr), 0.38% to 0.43% carbon (C), 0.20% to 0.30% molybdenum (Mo), 0.15% to 0.30% silicon (Si), 0.04% sulfur (S), and 0.0.35% phosphorus (P);
a second steel alloy comprising, in weight percent, 0.75% to 1.0% Mn, 0.80% to 1.1% Cr, 0.38% to 0.43% C, 0.15% to 0.25% Mo, 0.15% to 0.30% Si, 0.04% S, and 0.0.35% P; or
a third steel alloy comprising, in weight percent, 0.60% to 0.80% Mn, 1.65% to 2.0% Ni, 0.70% to 0.90% Cr, 0.38% to 0.43% C, 0.20% to 0.30% Mo, 0.15% to 0.30% Si, 0.04% S, and 0.0.35% P.
8. The torque tube assembly of claim 1 , wherein the first travel limit pin is configured to contact a portion of a wheel.
9. A multi-disk brake system, comprising:
a plurality of friction disks;
a piston configured to apply a force to the plurality of friction disks;
a wheel; and
a torque tube assembly, the torque tube assembly comprising:
a torque tube comprising a reaction plate, the reaction plate comprising a lip located at a radially outward end of the reaction plate,
a pressure pad coupled to the reaction plate, and
a first travel limit pin disposed between the reaction plate and a wall of the wheel, wherein the first travel limit pin extends into the lip of the reaction plate and terminates prior to the pressure pad, and wherein a distance between the first travel limit pin and the wall of the wheel is less than a maximum stroke distance of the piston.
10. The multi-disk brake system of claim 9 , wherein the first travel limit pin comprises a shaft portion and a head portion.
11. The multi-disk brake system of claim 10 , wherein the shaft portion of the first travel limit pin is disposed in the lip of the reaction plate.
12. The multi-disk brake system of claim 10 , wherein a surface of the head portion of the first travel limit pin is configured to complement a contour of the wall of the wheel.
13. The multi-disk brake system of claim 10 , wherein an angle between the head portion and the shaft portion of the first travel limit pin is about 90°.
14. The multi-disk brake system of claim 10 , wherein a thickness of the head portion of the first travel limit pin is configured to limit an axial movement of the reaction plate such that the plurality of friction disks remain within a stroke of the piston.
15. The multi-disk brake system of claim 9 , wherein the first travel limit pin is configured to limit an axial movement of the reaction plate such that in a worn state the plurality of friction disks remain within a stroke of the piston.
16. The multi-disk brake system of claim 9 , wherein the first travel limit pin is comprised of at least one of:
a first steel alloy comprising, in weight percent, 0.75% to 1.0% Manganese (Mn), 0.40% to 0.70% nickel (Ni), 0.40% to 0.60% chromium (Cr), 0.38% to 0.43% carbon (C), 0.20% to 0.30% molybdenum (Mo), 0.15% to 0.30% silicon (Si), 0.04% sulfur (S), and 0.0.35% phosphorus (P);
a second steel alloy comprising, in weight percent, 0.75% to 1.0% Mn, 0.80% to 1.1% Cr, 0.38% to 0.43% C, 0.15% to 0.25% Mo, 0.15% to 0.30% Si, 0.04% S, and 0.0.35% P; or
a third steel alloy comprising, in weight percent, 0.60% to 0.80% Mn, 1.65% to 2.0% Ni, 0.70% to 0.90% Cr, 0.38% to 0.43% C, 0.20% to 0.30% Mo, 0.15% to 0.30% Si, 0.04% S, and 0.0.35% P.
17. The multi-disk brake system of claim 9 , wherein the torque tube assembly further comprises a plurality of travel limit pins circumferentially spaced along the reaction plate, the plurality of travel limit pins including the first travel limit pin.