Title:
ROTATIONAL SPEED DETECTING DEVICE AND HYDRAULIC PUMP OR MOTOR THEREWITH
Document Type and Number:
Japanese Patent JP3805457
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a rotational speed detecting device whose structure is simple and which can take out a rotational speed as a pressure value which can be easily hydraulically controlled.
SOLUTION: A successive surface 2 which is dipped under lubricating oil 11 such as operating oil and forms a part of a rotor 1, and a partial surface 3 which has a constant distance from the successive surface 2 and forms together with the successive surface 2 a minute clearance part 8 comprising an inlet 5 into which lubricating oil can be let to flow and an outlet 6 from which lubricating oil can be delivered, are arranged in this rotational speed detecting device, and a gradient 7 is arranged on the partial surface 3 so that the minute clearance part 8 is gradually reduced from the inlet 5 toward the outlet 6, and also a pressure detecting port 9 is arranged in a part nearer to the outlet 6 than the center of the minute clearance part 8 on the partial surface 3. Hereby, a rotational speed can be taken out by pressure.
Inventors:
Satoshi Hamamoto
Yukihiro Shoji
Tadataka Hosato
Yukihiro Shoji
Tadataka Hosato
Application Number:
JP1184997A
Publication Date:
August 02, 2006
Filing Date:
January 08, 1997
Export Citation:
Assignee:
Fujikoshi Co., Ltd.
International Classes:
F04B1/20; F04B49/10; (IPC1-7): F04B1/20; F04B49/10
Domestic Patent References:
| JP44002757B1 | ||||
| JP5018364A | ||||
| JP7151629A | ||||
| JP7054624Y2 | ||||
| JP58127363U |
Attorney, Agent or Firm:
Junji Kawachi