Planet speed reducer for bridge crane

Abstract

The invention relates to a planetary reducer essentially used for a small traveling crane on a bridge crane at port bank and also used for a hoisting mechanism of other similar machines; the planetary reducer comprises a bracket (2), an input spline housing (1), a three-level planetary transmission device, a ring gear (7) and so on. The bracket (2) is fixed on the small traveling crane. The input spline housing (1) is arranged on a central hole of the bracket (2). The axle of a primary solar wheel (10) in the three-level planetary transmission device is inserted in the other end of the input spline housing (1). A three-level planetary bracket (13) is fixedly connected with the bracket (2). The ring gear (7) fixed on a hoisting mechanism drum (12) is arranged on the external side of the three-level planetary transmission device and is meshed with the three-planetary bracket at the same time. The three planetary gears transport the torque to the ring gear (7) at the same time. The ring gear (7) is directly output to the hoisting mechanism. The planetary reducer has the advantages of simple and compact structure, novel transmission way, high transmission efficiency, simple manufacturing and maintenance, high reliability, low breakdown rate and low cost, etc.

Description

1. Technical field: [0001] The present invention is a new type of planetary reducer, specifically a planetary reducer mainly used for small cranes on bridge cranes on the shore of ports, and can also be used for hoisting mechanisms of other similar machines. 2. Background technology: [0002] The port shore bridge crane is a machine used for cargo container loading and unloading in the port. On the top (about 50 meters above the ground) there is a small trolley specially used for bridge crane assembly and maintenance services. There are two side by side on the small trolley The hoisting mechanism has a hoisting reducer in each mechanism. Since bridge crane products are used in ports and wharves and are exported to various countries, the requirements for the hoist reducer are very high, and the imported reducer was originally used. The reducer belongs to the NGW series three-stage planetary transmission. The reducer is fixed on the bracket at one end of the hoisting mechanis...

AI Technical Summary

Problems solved by technology

After several years of use, the following shortcomings were found: ①The transmission line of the original structure is long, and the length of the transmission shaft is about 1400 mm. The processing and assembly positioning accuracy is not easy to guarantee, resulting in damage to some transmission parts, and assembly and maintenance are very difficult.

②The original structure is the output of the last-stage planetary carrier, resulting in a larger volume of the final-stage planetary transmission and a larger axial dimension of the entire reducer

③The transmission shaft connected to the final planetary carrier bears all the output torque, and the splines at both ends of the transmission shaft often break down, causing the small crane to not operate normally

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