The ship roller bearing is generally composed of four parts: outer side, inner hole, turnover body and ball bearing. Strictly speaking, it is composed of six parts: outer side, inner hole, turnover body, ball bearing, tightness and grease. It mainly has outer side, inner hole and turnover body, which definitely means roller bearing. According to the turning body, roller bearings are divided into ball bearings and roller bearings.
Japanese and Korean shipyards and main engine plants still have a large demand for large marine forgings. Due to the impact of exchange rate changes and differences in productivity, management and production technology, the price of domestic marine forgings is slightly higher than the international market price. In addition, the increasingly shorter delivery time undoubtedly makes it more difficult for domestic marine forgings manufacturers to undertake orders, which is also the reason why domestic manufacturers of marine forgings have not exported much to South Korea and Japan in recent years.
With the increase of technical transformation by domestic marine forging plants in the past few years and the sharp decline of production costs, the production of high-quality marine large forgings will inevitably attract more customers at home and abroad. With the gradual improvement of China's shipbuilding and marine diesel engine manufacturing level, the market prospect of Dalian marine parts will be considerable.
Some marine bearings are provided with fastening screws on the inner sleeve, which can be used to position the bearing on the shaft. At this time, the processing size of the shaft is two threads smaller than the inner diameter of the bearing, so as to facilitate the adjustment of the bearing position. The rest is the bearing fastening sleeve. The inner diameter of the bearing is conical. A fastening sleeve with an outer conical surface is installed inside. The fastening sleeve is provided with a round nut and a thrust pad. The bearing and the fastening sleeve are installed on the shaft. Tighten the nut, and the bearing is installed on the shaft.
(1) Hot sleeve installation
The hot sleeve method that the bearing is heated in oil to expand and then installed on the shaft can avoid unnecessary external forces and complete the installation in a short time.
(2) Press in installation
Generally, press machine, bolt and nut can be used for press installation, and hand hammer can be used for installation when necessary.
