A imthacaí liathróid sraith dhúbailte Is imthacaí eilimint rollta é ina bhfuil dhá shraith chomhthreomhara de liathróidí a shíneann in dhá grooves rásbhealaigh atá meaisínithe isteach i bhfáinne istigh amháin agus i bhfáinne seachtrach amháin. Compared to a standard single row deep groove ball bearing of equivalent outer diameter, a double row design provides approximately 60–70% higher radial load capacity agus an spás aiseach céanna á áitiú aige — rud a fhágann gurb é an réiteach is fearr leat aon áit a gcaithfear tacú le hualaí arda gathacha nó le comhualaí gathacha agus aiseach laistigh de dhlúththithíocht.
How a Imthacaí Liathróid Sraith Dúbailte Differs from a Single Row Bearing
Comparison of single row and imthacaí liathróid sraith dhúbailtes across key performance parameters | Paraiméadar | Imthacaí Liathróid Aonair | Double Row Ball Bearing |
| Ball rows | 1 | 2 |
| Cumas ualaigh gathacha | Bunlíne | ~60–70% níos airde |
| Cumas ualaigh aiseach | measartha (an dá threo) | Maith (an dá threo) |
| Leithead | Níos cúinge | Níos leithne (OD céanna) |
| Caoinfhulaingt mí-ailínithe | Íseal (caighdeánach), níos airde (teagmháil uilleach) | Íseal go measartha |
| Cumas cuimilte / luais | Frithchuimilt níos ísle, luas níos airde | Frithchuimilt beagán níos airde, luas measartha |
| Costas aonaid | Íochtarach | Níos airde (vs. singil, níos ísle vs. dhá singil) |
Príomhchineálacha Imthacaí Liathróid Sraith Dúbailte
Imthacaí Liathróid Deep Groove Double Row
An leagan is coitianta. Both rows of balls run in symmetrical deep groove raceways, enabling the bearing to handle radial loads and moderate axial loads in both directions simultaneously . The two rows share a common inner ring, outer ring, and often a two-part pressed steel or machined brass cage. Raon méideanna tolladh tipiciúil ó 10 mm go 200 mm . These bearings are available with seals (2RS) or shields (ZZ) for grease retention and contamination exclusion in demanding environments.
Imthacaí Liathróid Teagmhála Uathoibríoch Sraith Dúbailte
In this design, the balls contact the raceways at a defined angle — typically 15°, 25°, nó 40° — which enables the bearing to carry significantly higher axial loads compared to deep groove designs. Is minic a socraítear an dá shraith i an O-configuration (back-to-back) or X-configuration (face-to-face) , each suited to different moment load and preload requirements. Úsáidtear na imthacaí seo go forleathan i bhfearsaidí uirlisí meaisín, tiomántáin scriú, agus giarbhoscaí cruinne ina bhfuil cumas ualaigh agus rigidity comhcheangailte ríthábhachtach.
Imthacaí Liathróid Féin-Ailíniú Sraith Dúbailte
Tá rásbhealach seachtrach sféarúil ann a ligeann don fháinne istigh agus don chóimeáil liathróid tilt i gcoibhneas leis an bhfáinne seachtrach, a fhreastalaíonn ar sraonadh seafta nó ar mhí-ailíniú tithíochta. suas go dtí 2-3° . Fágann sin go bhfuil siad oiriúnach d’fheidhmchláir a bhfuil seaftaí solúbtha acu, réisí fada gan tacaíocht, nó clúdaigh nach féidir a ailíniú le cruinneas ard — amhail innealra talmhaíochta, trealamh teicstíle, agus iompróirí.
Feidhmchláir tipiciúla Imthacaí Liathróidí Sraith Dúbailte
- Imthacaí tosaigh mótair leictreacha: Iompraíonn an t-iompar is gaire don taobh tiomáinte ualaí gathacha níos airde ó theannas crios - leathnaíonn dearadh sraithe dúbailte sa suíomh seo saol na seirbhíse i gcomparáid le sraith amháin.
- Moil roth feithicleach (neamh-tiomáinte): Compact double row deep groove bearings carry the full wheel radial and axial loads within the constrained hub geometry.
- Fearsaidí uirlisí meaisín: Double row angular contact bearings provide the high axial rigidity required for precision cutting and grinding operations.
- Seafta aschuir giarbhosca: Where combined gear separation forces and torque reaction loads exceed the capacity of a single row bearing.
- Trealamh talmhaíochta agus tógála: Self-aligning double row bearings tolerate the misalignment and shock loads common in field machinery.
- ulóga agus rollóirí iompróra: High radial capacity in a compact envelope suits heavy-duty bulk material handling installations.
Selection Criteria: When to Specify a Double Row Ball Bearing
Roghnaigh a double row ball bearing when the application meets one or more of the following conditions:
- The radial load exceeds the capacity of a single row bearing of the available bore size, and increasing the bore size is not an option due to shaft or housing constraints.
- Combined radial and axial loads are present simultaneously and a single thrust bearing paired with a radial bearing would be too complex or too wide.
- Tá spás aiseach srianta — two single row bearings in tandem require more axial length and two separate housings; one double row unit is more compact and simpler to install.
- Is ábhar imní é mí-ailíniú seafta — specify a double row self-aligning type to prevent premature bearing failure from bending loads transmitted through a misaligned shaft.
