Gib-head taper key protection device for transmission shaft of railroad hopper car

Abstract

The invention provides a gib-head taper key protection device for a transmission shaft of a railroad hopper car. The transmission shaft is used for being connected with a butt joint component in an inserted mode, a gib-head taper key is keyed between the transmission shaft and the butt joint component, the protection device comprises a pressing mechanism and a connecting assembly, and the pressing mechanism is fixed to the end portion of the transmission shaft through the connecting assembly. The side, facing the transmission shaft, of the pressing mechanism makes contact with the gib-head taper key. According to the gib-head taper key protection device for the transmission shaft of the railroad hopper car, the pressing mechanism and the connecting assembly are matched to replace an L-shaped stop iron structure for preventing looseness and falling off of the gib-head taper key in the prior art, manufacturing and overhauling are convenient, all the components can be repeatedly used, the assembling and disassembling efficiency is high, and the manufacturing cost can be effectively reduced. Operation and maintenance of operators are facilitated.

Description

technical field [0001] The invention belongs to the technical field of railway hopper cars, and more particularly relates to a protection device for a coupler head wedge key of a transmission shaft of a railway hopper car. Background technique [0002] At present, the railway coal and ballast hopper cars all adopt a bottom door opening and closing mechanism with two-stage transmission, which is mainly composed of an upper transmission device, a connecting rod device, and a lower transmission device. The four-bar linkage mechanism of the rod controls the opening and closing of the bottom door. Among the above transmission parts, such as figure 1 As shown, the hook wedge key 3 is usually used to transmit torque between the transmission shaft 1 and the gear or crank throw 2 in the transmission part, and the hook wedge key 3 is wedged between the keyway of the transmission shaft 1 and the gear or crank throw 2, After assembly, it can generate a large pre-tightening force. When...

AI Technical Summary

Problems solved by technology

The hook head wedge key 3 has the national standard GB / T1564 specification, but the standard hook head wedge key has the following problems in the use process: the hook head wedge key 3 is self-locked by the slope to prevent loosening, but in actual use due to oil immersion, Long-term alternating loads will also loosen. Once loosened, the side of the hook wedge key 3 will become the working surface, and the extrusion stress of the keyway will increase sharply, often causing the keyway to be damaged due to extrusion deformation.

In addition, in extreme cases, there is a risk of the hook key 3 falling off. Once it falls off, the bottom door of the railway funnel may be accidentally opened and the goods will be unloaded to the track, which will affect the safety of train transportation. Currently, the hook key 3 and After the transmission shaft 1 is assembled, the L-shaped iron stopper 6 is used to limit the axial direction to prevent the wedge key 3 of the hook head from escaping

[0003] This limit method has the following disadvantages: 1. When the parts on the drive shaft need to be replaced for maintenance, the L-shaped stopper 6 welded at the end of the drive shaft needs to be removed. Welding after assembly, the maintenance efficiency is low and the cost is high, and when the welding preventive measures are improper, it will cause the axle end bearing of the bogie to be over-charged and cause bearing pitting and other problems, thereby affecting driving safety; 2. Due to the L-shaped iron stop 6 Influenced by manufacturing errors and welding deformation, there may be a gap between the L-shaped iron stopper 6 and the hook key 3 after assembly and welding. 3. The iron retainer is L-shaped cantilever structure, which has eccentricity, and the force is not good, and the L-shaped iron retainer 6 adopts the structure of steel plate bending parts, in order to facilitate bending , the steel plate is made of thin-walled steel plate, so the rigidity of the iron stopper is small. When the wedge key 3 of the hook head escapes to the shaft end, it is easy to cause the deformation of the L-shaped iron stopper 6, resulting in the failure of the anti-loosening function. Extrusion stress increased sharply, resulting in damage to the keyway due to extrusion deformation; 4. When the L-shaped iron stopper 6 is assembled with the rear stop hook head wedge key 3, the pre-tightening force is not easy to adjust. When the pre-tightening force is too small, it is not enough to overcome the hook When the head wedge key 3 escapes or there is no pre-tightening force, it will cause the problem that the anti-loosening effect of the hook head wedge key 3 will fail

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