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US 4,301,487 AGranted
Rotary head assembly with lubricating double sleeve construction
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorTeruo Maruyama
Life of this patent
Estimating the term…
Abstract
In a rotary head assembly for magnetic recording and reproducing apparatus such as VTR, fluid or hydraulic radial and thrust bearings are provided between a stationary sleeve whose one end is closed fluid-tightly and a rotary shaft rotatably extended into said stationary sleeve, whereby the rotary head assembly may be made compact in size and easy to assemble, may rotate with a higher degree of reliability and may completely seal lubricant.
Claims6
A rotary head assembly, comprising:
- (a) a stationary sleeve having one end securely fixed to a base;
- (b) a rotary shaft coaxial with and rotatably extended through said stationary sleeve and contained within said base and leaving a cylindrical space therebetween;
- (c) a rotary sleeve coaxial with and radially surrounding said stationary sleeve, leaving a cylindrical space therebetween, said cylindrical spaces communicating with each other, said rotary shaft extending through said rotary sleeve and being fixed thereto;
- (d) a stationary cylinder securely mounted on said base coaxially of said stationary sleeve;
- (e) a rotary cylinder which has the same outer diameter as that of said stationary cylinder and is mounted securely on said rotary shaft adjacent to said stationary cylinder and axially spaced apart from said stationary cylinder by a predetermined distance;
- (f) a means for driving said rotary cylinder;
- (g) a head securely mounted on said rotary cylinder for sliding contact with a tape which is wrapped and transported around the cylindrical surfaces of said stationary and rotary cylinders;
- and
- (h) a lubricating fluid filled into the space between said stationary sleeve and said rotary shaft, and the space between said stationary sleeve and said rotary sleeve, thereby forming a bearing fluid film portion consisting of
- (i) a thrust bearing portion which is defined by a flange which is secured to or formed integral with said rotary shaft and has a diameter greater than that of said rotary shaft the wall surfaces of said stationary sleeve,
- (ii) seal means to preclude leakage of said lubricating fluid, and
- (iii) a radial bearing portion defined by said cylindrical spaces and said fluid, said driving means being mounted exterior of said radial bearing portion.
9 more elements
Dependencies are inferred from the claim text.