Hydrodynamic bearings generate their oil film from relative motion; hydrostatic bearings are pumped up by an external supply. The difference decides stiffness, low-speed behavior, and where each belongs.
Гидродинамический создаёт плёнку движением поверхностей, без насоса. Гидростатический питается от внешнего насоса через дроссели.
Плёнка есть даже на нуле оборотов — высокая жёсткость, нет ползучести, субмикрон с первого оборота. Гидродинамика жёстка только на ходу.
Гидродинамика — для быстроходных валов. Гидростатика — для точности, низов и частых пусков, как Marusaku.
Thủy động tạo màng nhờ chuyển động bề mặt, không cần bơm. Thủy tĩnh được bơm ngoài qua van tiết lưu.
Màng có cả ở tốc độ 0 — cứng cao, không bò, submicrom từ vòng quay đầu. Thủy động chỉ cứng khi quay nhanh.
Thủy động cho trục tốc cao. Thủy tĩnh cho chính xác, tốc thấp, hay khởi động, như Marusaku.
Le palier hydrodynamique crée le film par le mouvement, sans pompe. L'hydrostatique est alimenté par une pompe externe via restrictieurs.
Le film existe même à zéro tour—grande raideur, pas de rampement, submicron dès le premier tour. L'hydrodynamique n'est raide qu'en marche.
Hydrodynamique pour arbres rapides. Hydrostatique pour précision, basse vitesse et démarrages fréquents, comme Marusaku.
Das hydrodynamische Lager erzeugt den Film durch Bewegung, ohne Pumpe. Das hydrostatische wird von einer externen Pumpe über Drosseln gespeist.
Der Film existiert schon bei Null Drehzahl—hohe Steifigkeit, kein Kriechen, Submikron vom ersten Umlauf. Hydrodynamik ist nur im Lauf steif.
Hydrodynamik für schnelle Wellen. Hydrostatik für Präzision, Langsam- und Starthäufigkeit, wie Marusaku.
Both hydrostatic and hydrodynamic bearings use a lubricating oil film to separate surfaces, but they create it differently. A hydrodynamic bearing relies on the relative motion of the surfaces to wedge oil into a load-carrying film—no external pump is needed.
A hydrostatic bearing is fed by an external high-pressure pump through restrictors, so the film exists even at zero speed. That gives it high, load-adaptive stiffness, no low-speed crawl, and sub-micron runout from the first rotation. A hydrodynamic bearing is stiff only once it is spinning fast enough to build its wedge.
Hydrodynamic bearings suit high-speed, continuous-duty shafts where simplicity matters. Hydrostatic bearings suit precision, low-speed, or frequently-started axes where stiffness, accuracy, and zero wear matter most—exactly the domain of Marusaku spindles and rotary tables.
