STEERING DEVICE

PROBLEM TO BE SOLVED: To obtain a steering device having a telescopic function suitable for a vehicle type which rotates an entire driving cab to expose a power unit such as an engine to the outside.SOLUTION: A steering device comprises: an upper shaft 1; a lower shaft 2; a cover member 3 having a large inner diameter part 31a and a small inner diameter part 31b; and a seal member 4. In the vicinity of the upper part of the lower shaft 2, a part to be locked 23 is formed, and the seal part 4 is attached so as to be locked. The upper shaft 1 and the lower shaft 2 are jointed slidably through an outer spline and an inner spline. The cover member 3 covers a joint part J between the upper shaft 1 and the lower shaft 2, and the upper end of the cover member 3 is fixed to the upper part of the upper shaft 1. The seal member 4 is not in contact with the large inner diameter part 31a of the cover member 3. When the seal member 4 reaches the small inner diameter part 31b in an extension stroke of the upper shaft 1 and the lower shaft 2, the seal member 4 is brought into contact with the inner peripheral surface of the small inner diameter part 31b. 【目的】運転室全体を回転させて、エンジン等の動力部を外部に露出する車種に好適な伸縮機能を有するステアリング装置とすること。【構成】アッパーシャフト１と、ロアシャフト２と、大内径部３１ａと小内径部３１ｂを有するカバー部材３と、シール部材４とからなること。ロアシャフト２の上方付近には被係止部２３が形成されると共にシール部材４が係止装着され、アッパーシャフト１とロアシャフト２とは外スプラインと内スプラインを介して摺動自在に連結され、カバー部材３はアッパーシャフト１とロアシャフト２の連結部分Ｊを被覆すると共に、カバー部材３の上端はアッパーシャフト１の上方に固定され、シール部材４はカバー部材３の大内径部３１ａとは非接触であり、アッパーシャフト１とロアシャフト２との伸長行程でシール部材４の小内径部３１ａへの到達によりシール部材４は小内径部３１ｂの内周面と接触すること。【選択図】 図１