An Innovative Spool-Type Pressure Feedback Restrictor for Hydrostatic Bearings

Renn, Jyh-Chyang; Hsu, Wen-Jen; Li, Yun-Ruei

doi:10.1080/23080477.2016.1262650

Cited by 3 publications

(3 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The restrictor can withstand greater loads, and the flow is not affected by the viscosity of the oil or temperature changes. 26 In summary, previous research on throttling has focused on the influence of the throttling parameters on the static and dynamic characteristics of the hydrostatic support and the development of a new type of self-controlled feedback throttling, which aims to make the static stiffness of the hydrostatic support reach infinity through feedback.…”

Section: Introductionmentioning

confidence: 99%

The accuracy design of a new type of pin gauge annular slit restrictor based on the assembly success rate

Wang

Jia

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part C:

View full text Add to dashboard Cite

The restrictor is an indispensable compensation element in the constant pressure hydrostatic bearing. The annular slit restrictor has a direct impact on the throttling clearance due to the existence of machining error, which results in a low assembly efficiency. However, the assembly success rate can be increased by improving the machining accuracy, which increases the machining cost and machining cycle. To optimize the machining accuracy distribution of the restrictor, a closed-loop mixed-size chain tolerance model was established by considering the geometric tolerances. The influence of geometric error on the flow resistance of the traditional annular slit restrictor was analyzed by Worst Case analysis. The results show that the size error had the most significant effect on the flow resistance. The tilted state and eccentric state caused by geometric errors had little influence on the flow resistance. The existence of geometric errors will reduce the flow resistance. Based on the above research results, a new pin gauge annular slit restrictor, which has the advantages of a high precision and a low cost, was developed. Moreover, the influence of the installation conditions on the flow resistance was analyzed. The change in the flow resistance was reduced when the pin gauge was completely eccentrically installed. Additionally, the influence of the dimensional tolerance of the orifice on the success rate of the assembly was analyzed by the probability method. When the design tolerance of the orifice was ±4 μm, the success rate of the assembly reached 99.97%. Finally, the accuracy of the theoretical analysis results was verified by experiments.

show abstract

Section: Introductionmentioning

confidence: 99%

The accuracy design of a new type of pin gauge annular slit restrictor based on the assembly success rate

Wang

Jia

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part C:

View full text Add to dashboard Cite

show abstract

“…[4][5][6] However, it is difficult for the classical fixed orifice restrictor to adjust the geometrical structure according to the variation of external conditions, resulting in poor gas film stability. On this basis, variable restrictors, including diaphragm-type and spool-type restrictor, [7][8][9] are proposed for making up this shortcoming and obtaining relatively large gas film stiffness. 10,11 Many scholars have conducted a lot of research on diaphragm-type restrictor.…”

Section: Introductionmentioning

confidence: 99%

Fluid-structure coupling model and output characteristics of a diaphragm-type restrictor

Cai

Jiang

Meng

et al. 2022

Advances in Mechanical Engineering

View full text Add to dashboard Cite

The film stiffness of gas-lubricated hydrostatic bearings and seals are considered to be enhanced remarkably by proper design of a diaphragm-type restrictor. A fluid-structure coupling numerical model by coupling iteration of small deflection bending differential equation of circular thin plate and one-dimensional Reynolds equation was established, and the influence of different parameters, including pressure and geometrical parameters, on the flow output characteristics of a diaphragm-type restrictor was investigated numerically and experimentally. The results show that the correctness of established fluid-structure coupling numerical model is verified well by comparing calculated values of diaphragm deformation and output flow characteristics to the measured values. The optimum values of diaphragm thickness is 0.6–0.8 mm and initial throttle clearance is 20–35 μm for stable operation of diaphragm-type restrictor, while the optimum value of back pressure strongly depends on the diaphragm thickness.

show abstract

“…Some previous reports [5] indicated that disadvantages like the complex structure and difficult adjustment of the spool-type restrictor are inevitable. However, such a spool-type design is still believed to be a promising technique because the manufacturing of spool-type pressure feedback restrictor is basically easier than that of the above-mentioned membrane-type pressure feedback restrictor [6]. In this paper, a spool-type servo valve is chosen as an alternative to design the active compensator.…”

Section: Introductionmentioning

confidence: 99%

A Study on Active Closed-Loop Gap Control for Hydrostatic Bearing

Renn

2019

AMM

View full text Add to dashboard Cite

In this paper, a hydrostatic bearing controlled by servo-valve for precise closed-loop oil-film gap control is developed. Due to the increasing demands of larger dimension, heavier load and higher precision for current and future machine tools, the development of hydrostatic bearing has become a more and more important issue over the past decades. Nowadays, the most commonly used active pressure feedback restrictor for hydrostatic bearing is membrane type, in which a thin and flexible metal sheet serves as the key component to meter the hydraulic oil flow precisely. However, the membrane type pressure feedback restrictor is not quite suitable for extremely heavy load. Therefore, an alternative to design the active restrictor for hydrostatic bearing using servo-valve is presented in this paper. Different controllers are also designed and compared in this paper. There are two significant features regarding the proposed design. The first one is the introduced orifice restrictor inside the servo-valve which avoids the influence of possible oil temperature variation. The second feature is the introduced closed-loop oil-film gap control scheme that widens the application range effectively. Finally, a test rig of servo-valve controlled hydrostatic bearing is implemented and the experimental results prove the validity of the hydrostatic bearing with the proposed servo-valve and the closed-loop gap control scheme.

show abstract

An Innovative Spool-Type Pressure Feedback Restrictor for Hydrostatic Bearings

Cited by 3 publications

References 7 publications

The accuracy design of a new type of pin gauge annular slit restrictor based on the assembly success rate

The accuracy design of a new type of pin gauge annular slit restrictor based on the assembly success rate

Fluid-structure coupling model and output characteristics of a diaphragm-type restrictor

A Study on Active Closed-Loop Gap Control for Hydrostatic Bearing

Contact Info

Product

Resources

About