JP2004075041A5

JP2004075041A5 -

Info

Publication number: JP2004075041A5
Application number: JP2003128144A
Authority: JP
Filing date: 2003-05-06
Publication date: 2004-07-08

Description

【００１５】
操舵補助力発生用電動モーターと、そのモーターの回転軸に連結されたギヤ機構により回転速度を減速せしめる減速装置とを有し、そのギヤ機構の減速ギヤの少なくとも一つが合成樹脂製であり、その合成樹脂製ギヤがグリースにより潤滑される電動パワーステアリング装置であって、そのグリースは、基油と増ちょう剤と潤滑改善剤とを含み、その基油は合成炭化水素油であり、その増ちょう剤はリチウム系複合石鹸またはウレア系化合物から選ばれたものであり、その潤滑改善剤はポリテトラフルオロエチレンであり、かつ、そのグリースの１６０℃・１００時間における離油度：Ｘ（％）と、そのグリースの−４０℃における低温起動トルク：Ｙ（Ｎ・ｃｍ）とが、以下の（１）式および（２）式を満たす電動パワーステアリング装置。 0015.
It has an electric motor for generating steering assist force and a reduction gear that reduces the rotation speed by a gear mechanism connected to the rotation shaft of the motor, and at least one of the reduction gears of the gear mechanism is made of synthetic resin. An electric power steering device in which synthetic resin gears are lubricated with grease, the grease containing a base oil, a thickener and a lubrication improving agent, and the base oil is synthetic hydrocarbon oil, and the increase thereof. The agent was selected from a lithium-based composite soap or a urea-based compound, the lubrication improving agent was polytetrafluoroethylene, and the degree of oil release of the grease at 160 ° C. for 100 hours: X (%). , The low-temperature starting torque of the grease at −40 ° C.: Y (N · cm) is an electric power steering device that satisfies the following equations (1) and (2).

【００３７】
グリースの潤滑改善剤は、固体潤滑剤を用いる。さらに油性体を混合して用いても良い。潤滑改善剤は、基油と同様な潤滑作用を果たしていると考えられるが、基油とは別個にこれらを添加することにより、離油率を小さく維持したまま、低温トルク特性を小さくする、すなわち高温特性を改善することが可能になる。0037
A solid lubricant is used as the grease lubrication improver. Further, an oily substance may be mixed and used. The lubrication improver is considered to have the same lubricating action as the base oil, but by adding these separately from the base oil, the low temperature torque characteristics are reduced while maintaining the oil separation rate small, that is, It becomes possible to improve the high temperature characteristics.

【００３８】
ここで、固体潤滑剤としては、含フッ素樹脂であるポリテトラフルオロエチレン（ＰＴＦＥ）を用いる。含フッ素樹脂とは、通常、フッ素コーティング等に使用される低摩擦特性で非粘着性の樹脂をいう。 [0038]
Here, as the solid lubricant, polytetrafluoroethylene (PTFE), which is a fluororesin, is used. The fluororesin is a non-adhesive resin with low friction characteristics that is usually used for fluorine coating and the like .

Claims

An electric motor for generating steering assist power, and a reduction gear for reducing the rotational speed by a gear mechanism connected to the rotation shaft of the motor, at least one of the reduction gears of the gear mechanism being made of synthetic resin synthetic resin gear is an electric power steering apparatus that will be lubricated by the grease, the grease comprises a base oil and a thickener and a lubricating agent for improving the base oil is a synthetic hydrocarbon oil, the thickening The agent is selected from lithium complex soaps or urea compounds, and the lubricant improving agent is polytetrafluoroethylene, and the oil separation degree of the grease at 160 ° C. for 100 hours: X (%) , And the low temperature starting torque Y (N · cm) of the grease at -40 ° C satisfy the following equations (1) and (2):
3Y ≦ −10X + 140 (1)
0 <Y ≦ 30 (2)