BALL SCREW

• Main Authors: SUZUKI SEIJI, YAMAMOTO SHINPEI
• Format: Patent
• Language: English; Japanese
• Published: 23.03.2017
• Subjects: BLASTING; ENGINEERING ELEMENTS AND UNITS; GEARING; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; LIGHTING; MECHANICAL ENGINEERING; THERMAL INSULATION IN GENERAL; WEAPONS

PROBLEM TO BE SOLVED: To provide a ball screw having high cooling efficiency without performing cooling and lubrication with separate mechanisms, and without increasing the size of a nut.SOLUTION: A ball screw 1 includes a screw shaft 10, a nut 20, a rolling body 30, a seal member 40, a groove part 50, a discharge hole 51 and an oil supply hole 60. The groove part 50 is formed into a toric shape, and a plurality of groove parts are formed inside each of a plurality of seal members 40 on an inner peripheral surface 20a of the nut 20. The discharge hole 51 communicates with the groove part 50, and penetrates an outer peripheral surface 20b of the nut 20 in a radial direction. The oil supply hole 60 penetrates a spiral groove 21 of the nut 20 and the outer peripheral surface 20b of the nut 20 in the radial direction, and is formed between a plurality of groove parts 50, 50 in an axial direction.SELECTED DRAWING: Figure 1 【課題】冷却及び潤滑を別々の機構を用いることなく、ナットを大型化せず、冷却効率の高いボールねじを提供する。【解決手段】ボールねじ１は、ねじ軸１０と、ナット２０と、転動体３０と、シール部材４０と、溝部５０と、排出穴５１と、給油穴６０とを有する。溝部５０は、円環状をなし、ナット２０の内周面２０ａにおける複数のシール部材４０のそれぞれの内側に複数形成される。排出穴５１は、溝部５０に連通し、ナット２０の外周面２０ｂに径方向に貫通する。給油穴６０は、ナット２０の螺旋溝２１とナット２０の外周面２０ｂに径方向に貫通し、軸方向における複数の溝部５０，５０間に形成される。【選択図】図１