阅读说明：本技术 一种高速高同心度的组合型滚针轴承组件 (High-speed high-concentricity combined needle roller bearing assembly ) 是由 张旭 李大虎 于 2020-07-16 设计创作，主要内容包括：本发明公开了一种高速高同心度的组合型滚针轴承组件,包括保持架、滚针和轴圈,保持架内圈设有兜孔,兜孔内可转动地设有钢球,轴圈的翻边和滚道上设有引导和限定钢球滚动的弧形的沟道。轴承旋转过程中,钢球与沟道的接触为点接触且仅为滚动摩擦,钢球主要的作用是沿着轴圈上的弧形轨道运动,引导保持架以更高的同心度绕轴圈翻边结构高速运动,且钢球能承受少量的轴向载荷,滚针承受绝大部分的轴向载荷。此种结构适合应用于轴-孔装配件在高速运动、高同心度、极小径向跳动的场景,在钢球的参与下,滚针轴承能达到更高的极限转速,同时保持架的弧形结构和轴圈的沟槽也有储油功能,可以加快散热,减小摩擦。(The invention discloses a high-speed high-concentricity combined needle roller bearing assembly which comprises a retainer, needle rollers and a shaft ring, wherein a pocket is arranged on an inner ring of the retainer, a steel ball is rotatably arranged in the pocket, and an arc-shaped channel for guiding and limiting the steel ball to roll is arranged on a flanging and a raceway of the shaft ring. In the bearing rotation process, the steel ball is in point contact with the channel and only has rolling friction, the steel ball mainly acts on the arc-shaped track motion on the shaft ring, the guide retainer moves at a high speed around the shaft ring flanging structure with higher concentricity, the steel ball can bear a small amount of axial load, and the roller pin bears most of the axial load. The structure is suitable for being applied to the scenes of high-speed motion, high concentricity and extremely small radial run-out of a shaft-hole assembly part, the needle bearing can reach higher limit rotating speed with the participation of the steel ball, and meanwhile, the arc-shaped structure of the retainer and the groove of the shaft ring have the oil storage function, so that the heat dissipation can be accelerated, and the friction is reduced.)

1. A high-speed high-concentricity combined needle roller bearing assembly comprises a retainer, needle rollers and a shaft ring, and is characterized in that: the inner ring of the retainer is provided with a pocket, a steel ball is rotatably arranged in the pocket, and the turnup edge and the raceway of the shaft ring are provided with arc-shaped channels for guiding and limiting the rolling of the steel ball.

2. The high speed, high concentricity, combined needle roller bearing assembly of claim 1, wherein: the inner ring of the retainer is provided with an extension edge with a hook-shaped section, and the pocket is arranged on the extension edge.

Technical Field

The invention belongs to the technical field of bearings, and particularly relates to a needle bearing.

Background

The common retainer structure of the thrust needle roller bearing assembly comprises a box type and an M type, wherein the inner diameter of the M type retainer is divided into a single flanging and a double flanging, and the inner diameters of the M type retainer are cylindrical surfaces. When the roller pin-retainer assembly moves at a high speed, because no other constraint exists in a radial plane except for the constraint action of the flanging surface of the shaft ring gasket, the surface contact type sliding friction between the roller pin and the retainer assembly in movement always exists, the rotating speed is higher the longer the time is, the more heat is generated, and if the lubrication and heat dissipation are poor, the retainer can be heated in extreme time until the retainer breaks and fails.

Disclosure of Invention

In order to solve the technical problems, the invention is realized by the following technical scheme: a combined needle roller bearing assembly with high speed and high concentricity comprises a retainer, a needle roller and a shaft ring, wherein a pocket is arranged on an inner ring of the retainer, a steel ball is rotatably arranged in the pocket, and an arc-shaped channel for guiding and limiting the rolling of the steel ball is arranged on a flanging and a raceway of the shaft ring.

In the bearing rotation process, the steel ball is in point contact with the channel and only has rolling friction, the steel ball mainly acts on the arc-shaped track motion on the shaft ring, the guide retainer moves at a high speed around the shaft ring flanging structure with higher concentricity, the steel ball can bear a small amount of axial load, and the roller pin bears most of the axial load.

The structure is suitable for being applied to the scenes of high-speed motion, high concentricity and extremely small radial run-out of a shaft-hole assembly part, the needle bearing can reach higher limit rotating speed with the participation of the steel ball, and meanwhile, the arc-shaped structure of the retainer and the groove of the shaft ring have the oil storage function, so that the heat dissipation can be accelerated, and the friction is reduced.

Furthermore, the inner ring of the retainer is provided with an extension edge with a hook-shaped section, and the pocket is arranged on the extension edge.

Drawings

FIG. 1 is a schematic diagram of a thrust needle bearing of two configurations according to the prior art;

FIG. 2 is a schematic view of the cage of the present invention;

FIG. 3 is a top view and a cross-sectional view taken along the needles of view of the present invention 1/4;

FIG. 4 is a top view of the present invention 1/4 and a cross-sectional view taken away from the needles;

FIG. 5 is a schematic view of the collar of the present invention;

fig. 6 is a partially enlarged view of the channel of the collar of the present invention.

Detailed Description

The invention is described in detail below with reference to the following figures and embodiments:

a combined needle roller bearing assembly with high speed and high concentricity comprises a retainer, a needle roller and a shaft ring, wherein a pocket is arranged on an inner ring of the retainer, a steel ball is rotatably arranged in the pocket, and an arc-shaped channel for guiding and limiting the rolling of the steel ball is arranged on a flanging and a raceway of the shaft ring.

In the bearing rotation process, the steel ball is in point contact with the channel and only has rolling friction, the steel ball mainly acts on the arc-shaped track motion on the shaft ring, the guide retainer moves at a high speed around the shaft ring flanging structure with higher concentricity, the steel ball can bear a small amount of axial load, and the roller pin bears most of the axial load.

The structure is suitable for being applied to the scenes of high-speed motion, high concentricity and extremely small radial run-out of a shaft-hole assembly part, the needle bearing can reach higher limit rotating speed with the participation of the steel ball, and meanwhile, the arc-shaped structure of the retainer and the groove of the shaft ring have the oil storage function, so that the heat dissipation can be accelerated, and the friction is reduced.

Furthermore, the inner ring of the retainer is provided with an extension edge with a hook-shaped section, and the pocket is arranged on the extension edge.

It is to be emphasized that: the above embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention in any way, and all simple modifications, equivalent changes and modifications made to the above embodiments according to the technical spirit of the present invention are within the scope of the technical solution of the present invention.