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Variable flow-rate hydrostatic bearing

A technology of hydrostatic bearing and variable throttle, which is applied in the directions of bearings, shafts and bearings, bearings for linear motion, etc., and can solve problems such as changes in throttle ratio.

Inactive Publication Date: 2013-05-08
JTEKT CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the movable object may incline when the movable object moves, even if the pressure in the pocket inflow path is constant, there is still a fixed node due to the flow rate fluctuation of the interval according to the degree of inclination of the movable object. Fluctuation in the flow rate of the orifice, that is, the possibility of a change in the throttling ratio of the fixed orifice

Method used

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Embodiment Construction

[0013] Embodiments of the present invention will be described below with reference to the drawings.

[0014] Such as figure 1 As shown, the table feeding device 1 mounts the table 2 (bearing main body) slidably on the sliding part of the base 10 (fixed part), and installs a pair of back plates 5 (bearings) on the lower parts of both ends of the table 2 . main body) has a structure that can move only in the X-axis direction.

[0015] Such as figure 2 As shown, the table 2 has two pockets 2 a and a pair of pockets 2 c facing laterally facing downward on the surface facing the base 10 . The pocket holes 2a, 2c communicate with the two-stage throttle part 3 in which the fixed throttle part and the variable throttle part are connected in series, and the two-stage throttle parts 3 communicate with the oil supply pipeline 4 respectively. A discharge groove 2b is provided on the outer periphery of the pocket 2a.

[0016] The back plate 5 is provided with an upwardly facing pocket...

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Abstract

A variable flow-rate hydrostatic bearing includes a variable flow-rate adjusting portion that reduces the flow rate of fluid and then introduces the fluid into a pocket. The variable flow-rate adjusting portion is configured such that a fluid supply chamber (32a) is separated from a fluid storage chamber (31a) having a projection (31b) by a leaf spring (33) that faces the projection (31b) with a predetermined clearance left therebetween, and the projection (31b) has an opening (31c) and a flow passage that is in communication with the pocket (2a). In the variable flow-rate hydrostatic bearing, a fixed orifice (33a) that provides communication between the fluid supply chamber (32a) and the fluid storage chamber (31a) is formed in the leaf spring (33) at a portion that does not face the projection (31b).

Description

technical field [0001] The present invention relates to a variable orifice type hydrostatic bearing having two stages of orifice, including a fixed orifice and a variable orifice. Background technique [0002] It is known that if a static pressure bearing is equipped with two stages of fixed throttle and variable throttle in the supply path to the pocket, it is possible to increase the load applied to the bearing to increase the pressure in the pocket and Rigidity when the difference in supply pressure becomes small. [0003] In Japanese Patent Laid-Open No. 2002-286037, a variable throttle type hydrostatic bearing with two-stage throttle is disclosed, which uses a movable body with a fixed throttle to distinguish the inflow to the fluid supply chamber and the pocket. The fluid supply chamber has an opening arranged to face the movable body, and the flow rate flowing out of the opening is throttled by changing the distance between the movable body and the opening in accorda...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16C32/06
CPCF16C29/025F16C32/0648
Inventor 桥本高明
Owner JTEKT CORP