求翻译：向心滚针和保持架组件是一种独立的轴承原件，无内、外圈。适用于径向安装尺寸受限制的支承结构中，与轴承相配的轴颈表面和外壳孔表面直接作为轴承的内外滚动面。具有体积小，重量轻，承受负荷能力大，刚性高等优点。其中每支滚针都由保持架精确地引导和保持。可分为单列（型号表示为：K 内径×外径×宽度）和双列（型号表示为：KK内径×外径×宽度ZW）两种结构。一般用于汽车、拖拉机、工程机械等变速箱中和发动机连杆等部位。是什么意思？

Is an independent Radial needle roller and cage assemblies bearing the original inner and outer rings. Applies to the support structure of the size restrictions of radially mounted, directly as the bearing inner and outer rolling surfaces mating with the bearing journal surface and the surface of th

On the Center needle roller and cage assembly is an independent, non-bearing the original internal, external. For radial installation size restrictions in the supporting structure, and the bearing surface matching journal and housing bore directly as a bearing surface and outside of the scroll. A sm

Radial needle roller and cage assemblies is an independent bearing original, no inner and outer rings. Applies radial mounting dimensions restricted support structure, go with the bearing journal surfaces and shell holes directly as a scroll inside and outside surface of the bearing surface. With sm