| 摘要 |
A diaphragm for spring brake actuators includes an aperture that receives a threaded securement member such that the diaphragm is directly fixed to a push rod. In this way, misalignment between the push rod and the diaphragm is eliminated. To overcome any leakage through the aperture the diaphragm is formed with sealing beads compressed by the securement member to achieve a seal. Preferably, diaphragm plates are received on each side of the diaphragm, and the sealing beads are compressed by the securement member to achieve a seal between the securement member and the diaphragm plates. An adequate seal is thus achieved, while still allowing the direct connection of the diaphragm to the push rod by a threaded connecting member. The diaphragm plate on the power spring side of the diaphragm extends upwardly into a recess in the power spring plate, and is in facial contact in an axial direction with a surface of the power spring plate when the spring is actuated. At the same time, there is a clearance when the spring is compressed, such that misalignment of the push rod due to manufacturing tolerances is also eliminated. This contact resists misalignment between the power spring plate and the diaphragm plate, and consequently the diaphragm. There is some small radial clearance between the outer periphery of the diaphragm plate and the power spring plate such that the two members are "free floating" and may have some small amount of relative adjustment.
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