JP2010196805A5

JP2010196805A5 -

Info

Publication number: JP2010196805A5
Application number: JP2009042587A
Authority: JP
Filing date: 2009-02-25
Publication date: 2012-04-05
Anticipated expiration: 2029-02-25

Description

本発明は、軸受装置に関し、特に好適には自動車のディファレンシャル装置に組み込まれる軸受装置に関する。 The present invention relates to a bearing apparatus, and a bearing apparatus incorporated in the differential device of an automobile, particularly preferably.

本発明の上記目的は、下記の構成により達成される。
（１）回転体をハウジングに対し回転可能に支持する軸受装置であって、
前記軸受装置は、前記回転体の軸方向両端にそれぞれ設けられた軸受ユニットから構成され、
前記軸受ユニットはそれぞれ背面組み合わせの玉軸受からなり、軸方向外側に配置された前記玉軸受の内輪を軸方向内側に押圧することにより予圧の調整がなされ、
前記回転体の軸方向両端に設けられた前記軸受ユニットの少なくとも一方は、前記背面組み合わせの玉軸受のうち一方がアキシャル荷重を受ける玉軸受であり、他方がラジアル荷重を受ける玉軸受である荷重分担構造を有し、
前記アキシャル荷重を受ける玉軸受の外輪と前記ハウジングとの隙間が、前記ラジアル荷重を受ける玉軸受の外輪と前記ハウジングとの隙間より大きいことを特徴とする軸受装置。
（２）前記荷重分担構造を有する前記軸受ユニットにおいて、前記アキシャル荷重を受ける玉軸受の接触角が前記ラジアル荷重を受ける玉軸受の接触角より大きいことを特徴とする（１）に記載の軸受装置。
（３）前記荷重分担構造を有する前記軸受ユニットにおいて、前記ラジアル荷重を受ける玉軸受の内輪軌道面の溝径が前記アキシャル荷重を受ける玉軸受の内輪軌道面の溝径より大きいか、又は、前記ラジアル荷重を受ける玉軸受の内輪軌道面の溝底にカウンタボアが設けられたことを特徴とする（１）又は（２）に記載の軸受装置。
（４）前記軸受ユニットは、それぞれ前記回転体に形成された雄ねじにナットを螺合することにより、軸方向外側に配置された前記玉軸受の内輪が押圧されて予圧の調整がなされることを特徴とする（１）〜（３）のいずれかに記載の軸受装置。
（５）前記回転体は、ディファレンシャルケースであり、
該ディファレンシャルケースに設けられたディファレンシャルギヤを備えるディファレンシャル装置に組み込まれて、前記ディファレンシャルケースを前記ハウジングに対し回転可能に支持することを特徴とする（１）〜（４）のいずれかに記載の軸受装置。 The above object of the present invention can be achieved by the following constitution.
(1) A bearing device that rotatably supports a rotating body with respect to a housing,
The bearing device is composed of bearing units provided at both axial ends of the rotating body ,
Each of the bearing units is composed of a rear combination ball bearing, and the preload is adjusted by pressing the inner ring of the ball bearing disposed on the axially outer side in the axial direction ,
At least one of the bearing units provided at both axial ends of the rotating body is a load sharing in which one of the ball bearings of the rear combination is a ball bearing that receives an axial load and the other is a ball bearing that receives a radial load. Has a structure,
A bearing device , wherein a clearance between the outer ring of the ball bearing receiving the axial load and the housing is larger than a clearance between the outer ring of the ball bearing receiving the radial load and the housing .
(2) in the bearing unit having the load distribution structure bearing device according to (1), wherein a contact angle of the ball bearing receiving the axial load is greater than the contact angle of the ball bearing receiving the radial load .
( 3 ) In the bearing unit having the load sharing structure, the groove diameter of the inner ring raceway surface of the ball bearing receiving the radial load is larger than the groove diameter of the inner ring raceway surface of the ball bearing receiving the axial load, or The bearing device according to (1) or (2) , wherein a counterbore is provided at a groove bottom of an inner ring raceway surface of a ball bearing that receives a radial load.
( 4 ) The bearing unit is configured such that the inner ring of the ball bearing disposed on the outer side in the axial direction is pressed by adjusting a preload by screwing a nut to a male screw formed on the rotating body. The bearing device according to any one of (1) to ( 3 ).
(5) The rotating body is a differential case,
The bearing according to any one of (1) to (4), wherein the bearing is incorporated in a differential device including a differential gear provided in the differential case and rotatably supports the differential case with respect to the housing. apparatus.

本発明の軸受装置によれば、軸受装置が回転体の軸方向両端にそれぞれ設けられた軸受ユニットから構成されるとともに、各軸受ユニットは背面組み合わせの玉軸受から構成されるので、軸受の径方向の大型化を抑制しながら負荷容量を増大させることができる。
また、各軸受ユニットの軸方向外側に配置された玉軸受の内輪を押圧することで、並設された内輪同士を密着させて予圧の調整が行なわれるので、ハウジングとは独立して予圧を付与することができる。これにより、ハウジングに起因する問題、例えば、ハウジングの製造誤差による予圧のばらつき、予圧調整の煩雑さ、ハウジングの温度変化による予圧抜け、予圧過大による軸受寿命の低下をなくすことができる。 According to the bearing device of the present invention, the bearing device is composed of bearing units respectively provided at both ends of the rotating body in the axial direction, and each bearing unit is composed of a ball bearing in combination with the back surface. The load capacity can be increased while suppressing the increase in size.
Also, by pressing the inner ring of the ball bearings arranged on the outer side in the axial direction of each bearing unit, the preload is adjusted by bringing the arranged inner rings into close contact with each other so that the preload is applied independently of the housing. can do. As a result, problems due to the housing, for example, variations in preload due to housing manufacturing errors, complicated preload adjustment, loss of preload due to temperature changes in the housing, and reduction in bearing life due to excessive preload can be eliminated.

また、回転体に形成された雄ねじ部にナットを螺合することにより、軸方向外側に配置された玉軸受の内輪が押圧されて予圧の調整がなされるので、簡易な構成でハウジングとは独立して予圧の調整が可能となる。
In addition, by screwing the nut into the male thread portion formed on the rotating body , the inner ring of the ball bearing disposed on the outer side in the axial direction is pressed to adjust the preload, so that it is independent of the housing with a simple configuration. Thus, the preload can be adjusted.

Claims

A bearing device that rotatably supports a rotating body with respect to a housing,
The bearing device is composed of bearing units provided at both axial ends of the rotating body ,
Each of the bearing units is composed of a rear combination ball bearing, and the preload is adjusted by pressing the inner ring of the ball bearing disposed on the axially outer side in the axial direction ,
At least one of the bearing units provided at both axial ends of the rotating body is a load sharing in which one of the ball bearings of the rear combination is a ball bearing that receives an axial load and the other is a ball bearing that receives a radial load. Has a structure,
A bearing device , wherein a clearance between the outer ring of the ball bearing receiving the axial load and the housing is larger than a clearance between the outer ring of the ball bearing receiving the radial load and the housing .

2. The bearing device according to claim 1 , wherein in the bearing unit having the load sharing structure, a contact angle of a ball bearing receiving the axial load is larger than a contact angle of a ball bearing receiving the radial load.

In the bearing unit having the load sharing structure, the groove diameter of the inner ring raceway surface of the ball bearing receiving the radial load is larger than the groove diameter of the inner ring raceway surface of the ball bearing receiving the axial load, or the radial load is 3. The bearing device according to claim 1, wherein a counter bore is provided at a groove bottom of an inner ring raceway surface of the ball bearing to be received.

The bearing unit is characterized in that a preload is adjusted by pressing an inner ring of the ball bearing arranged on the axially outer side by screwing a nut to a male screw formed on the rotating body. The bearing apparatus of any one of Claims 1-3 .

The rotating body is a differential case,
The bearing according to claim 1, wherein the bearing is incorporated in a differential device including a differential gear provided in the differential case and rotatably supports the differential case with respect to the housing. Equipment .