PEAK TORQUE LOWERING COMPOSITION, PART WITH SLIDING PART USING THE COMPOSITION, AND PRESS-FITTING METHOD USING THE COMPOSITION
申请人:Citizen Watch Co. Ltd.
公开号:EP1386982A1
公开(公告)日:2004-02-04
The peak-torque descending composition of the present invention contains a certain amount of an extreme pressure agent comprising at least neutral phosphate esters and/or neutral phosphite esters in a solvent comprising hydrocarbons and/or ethers. Further, a certain corrosion inhibitor may be contained. The part having a sliding portion of the present invention is surface-treated with the above composition. The process for producing a component or precision machine having a sliding portion comprises immersing a part having a sliding portion in the above composition to adhere or absorb the composition onto the surface of the part, then immediately, taking out the part from the composition, followed by drying, and subsequently assembling a component or precision machine using the part. The press fit method of the present invention comprises in pressing a metal shaft into a metal plate, preliminarily immersing the metal plate or the metal shaft in the peak-torque descending composition to adhere or absorb the composition onto an inner surface of a hole for press fit of the metal plate or the surface of the shaft, then immediately, taking out the metal plate or the shaft from the composition, and drying.
According to the process for the production of a component or precision machine having a sliding portion of the present invention, the peak-torque descending composition of the invention is used as the surface treating agent, so that the gearwheel body having a slip mechanism which can be made from metallic materials with a simple structure wherein a large peak torque does not produce in an initial stage when slipped and wheel teeth of the gearwheel are not chipped even when the plastic gearwheel is used, can be efficiently produced. According to the present invention, there can be provided a press fit method wherein the occurrence of a burr phenomenon is prevented when the shaft is pressed into the metal plate.
本发明的峰值扭矩下降组合物含有一定量的极压剂,该极压剂至少由中性磷酸酯和/或中性亚磷酸酯组成,其溶剂包括碳氢化合物和/或醚。此外,还可能含有某种腐蚀抑制剂。具有本发明滑动部分的部件用上述组合物进行表面处理。生产具有滑动部分的部件或精密机器的工艺包括:将具有滑动部分的部件浸入上述组合物中,使组合物附着或吸收到部件表面,然后立即将部件从组合物中取出,接着干燥,然后使用该部件组装部件或精密机器。本发明的压配方法包括在将金属轴压入金属板时,先将金属板或金属轴浸入峰值扭矩下降组合物中,使组合物粘附或吸收到金属板压配孔的内表面或轴的表面上,然后立即从组合物中取出金属板或轴,并进行干燥。
根据本发明的具有滑动部分的部件或精密机器的生产工艺,使用本发明的峰值扭矩下降组合物作为表面处理剂,可以高效地生产出具有滑动机构的齿轮体,该齿轮体可以由金属材料制成,结构简单,在滑动初期不会产生较大的峰值扭矩,即使使用塑料齿轮,齿轮的轮齿也不会崩裂。根据本发明,可以提供一种压配方法,当轴被压入金属板时,可以防止毛刺现象的发生。