Brake

• US 20050269868A1
• Filed: 05/19/2005
• Published: 12/08/2005
• Est. Priority Date: 06/02/2004
• Status: Abandoned Application

• Current Assignee: Fanuc Ltd (Fanuc Corporation)
• Original Assignee: Fanuc Ltd (Fanuc Corporation)
• Inventors: Kawai, Tomohiko, Minami, Hiroshi
• Application Number:
  US11/132,319
• Publication Number:
  US 20050269868A1
• Time in Patent Office: Days
• US Class Current: 303/2
• CPC Class Codes: F16C 32/064 the liquid being supplied under pressure
• CPC Class Codes: F16C 32/0696 for both radial and axial load
• CPC Class Codes: F16D 2121/02 Fluid pressure
• CPC Class Codes: F16D 2125/06 Pistons
• CPC Class Codes: F16D 65/186 with full-face force-applying member, e.g. annular

Abstract

Upper and lower thrust bearing faces and a peripheral radial bearing face are formed to surround peripheral and end portions of a disk provided to a rotating shaft supported by a fluid bearing. Pressurized fluid is supplied to the respective bearing faces from first to third fluid passages to thereby form fluid bearing faces. In order to rotate the rotating shaft, the pressurized fluid is supplied to all the passages to keep the rotating shaft and the disk from contact with a bearing member. In order to brake the rotating shaft, fluid supply to the second passage is interrupted. Thus, the rotating shaft is moved down by pressure on the bearing face on the first passage side and, as a result, the brake member comes in contact with the static portion to apply the brakes.

Claims

1. A brake in a rotating shaft supported by a fluid bearing, wherein fluid supplied to one of opposed thrust bearing faces of the fluid bearing is interrupted, the rotating shaft is pressed against the thrust bearing face where the fluid is interrupted by pressure of the fluid on the thrust bearing face where the fluid is not interrupted, and a brake face provided to the rotating shaft is brought into contact with a static portion to thereby brake the rotating shaft.

3. The brake according to claim 1 or 2, wherein the static portion is the bearing face where the fluid is interrupted.

2. A brake in a direct-acting slide supported by a fluid bearing, wherein fluid supplied to one of opposed thrust bearing faces of the fluid bearing is interrupted, the direct-acting slide is pressed against the thrust bearing face where the fluid is interrupted by pressure of the fluid on the thrust bearing face where the fluid is not interrupted, and a brake face provided to a direct-acting slide portion is brought into contact with a static portion to thereby brake the direct-acting slide.

4. A brake comprising:

a rotating shaft integrally formed with a flange-shaped disk;

a bearing member disposed to surround an outer peripheral face and upper and lower end faces of the disk;

first and second fluid passages formed in the bearing member so as to respectively supply fluid to gaps between the upper end face and the lower end face of the disk and the bearing member; and

a valve for interrupting fluid supply to one of the first and second fluid passages,

wherein the fluid is supplied between the disk and the bearing member through the first and second fluid passages when the valve is open, and

the rotating shaft is moved down or up and brought into contact with the bearing member by pressure of the fluid supplied through the second or first fluid passage to thereby be braked when the valve is closed.

5. A brake comprising:

a direct-acting slide portion having projecting portions or groove portions on its left and right sides,

a base having groove portions or projecting portions on its left and right sides to be engaged with the projecting portions or the groove portions of the direct-acting slide portion;

first and second fluid passages formed in the left and right projecting portions or groove portions of the direct-acting slide portion; and

a valve for interrupting fluid supply to one of the first and second fluid passages,

wherein the fluid is supplied between the projections or grooves of the direct-acting slide portion and the groove portions or projecting portions of the base through the first and second fluid passages to form a fluid bearing when the valve is open, and

the direct-acting slide portion is pressed leftward or rightward and brought into contact with the base by pressure of the fluid supplied through the second or first fluid passage to thereby be braked when the valve is closed to interrupt fluid supply to the first or second fluid passage.