One-way non-lost motion friction damper

Abstract

The invention relates to a one-way friction damper without lost motion. The damper comprises: an outer casing; a braking assembly, which is arranged inside the outer casing, includes an optical axis, a rack, a driving gear, and includes a meshing portion connected by a coaxial step And the one-way driving part, the side of the meshing part is provided with teeth, which are meshed with the rack for transmission connection, and the inside of the driving gear is provided with a stepped coaxial hollow section, and the overrunning clutch is sleeved in the hollow section of the one-way driving part. It is connected with the transmission of the one-way drive part, the main shaft is perpendicular to the optical axis, and is sleeved in the hollow section of the meshing part and the overrunning clutch. Several friction assemblies are sheathed on both ends of the main shaft; the upper connecting plate is arranged on the upper side of the outer casing and connected with the upper end of the optical axis; the lower connecting plate is arranged on the lower side of the outer casing. Compared with the prior art, the invention has high efficiency without lost space, and avoids components from being pressed.

Description

technical field [0001] The invention relates to the technical field of energy dissipation and shock absorption of civil engineering structures, in particular to a one-way friction damper without lost motion. Background technique [0002] There are many tension members in the building structure, but there is no energy dissipation and shock absorption equipment specially suitable for the tie rod system at present. Ordinary dampers are used in tension members. Under earthquake action, members that are normally only under tension may also be under compression, so the members are likely to be buckled under compression. However, when a one-way friction damper is used in a tension member, although the member may still undergo compression deformation under the action of an earthquake, once it is compressed, the one-way damper will work immediately to release the pressure in the member, so it will not The buckling failure of the member is caused, and the member can be designed compl...

AI Technical Summary

Problems solved by technology

When the transmission rod moves upwards, the ratchet rotates clockwise, the inner teeth of the ratchet cannot block the pawl, the ratchet cannot drive the inner wheel to rotate, the inner wheel cannot drive the transmission shaft to rotate, the transmission shaft cannot drive the main board to rotate, and the main board cannot rub against the friction plate. At this time, no damping force is generated, which can avoid buckling or damage of components under pressure; when the transmission rod moves downward, the ratchet rotates counterclockwise, and the inner teeth of the ratchet block the pawl, driving the inner wheel to rotate, and the inner wheel drives the transmission shaft to rotate. Therefore, when the main plate fixed on the transmission shaft rotates, it will rub against the friction plate under a certain pre-tightening force. However, the one-way friction damper disclosed in this patent has a backlash phenomenon, and the pawl needs to be stuck in the ratchet wheel to be able to Drive the transmission shaft to rotate, that is, when the displacement of the damper reaches the negative peak value and moves to the zero position, the damping force does not increase immediately and remains at a certain value close to zero, which will reduce the working efficiency of the damper

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