CN203717633U - Ball bearing unit for turbocharger - Google Patents

Abstract

The utility model provides a ball bearing unit for a turbocharger. The ball bearing unit comprises an outer ring, two inner rings, two rows of balls and a holding rack, wherein the outer ring consists of a single cylinder and is provided with a plurality rows of outer ring rolling way surfaces; the inner rings are provided with a plurality rows of inner ring rolling way surfaces which are respectively opposite to the outer ring rolling way surfaces; the two rows of balls freely roll among the outer ring rolling way surfaces and the inner ring rolling way surfaces; the holding rack is used for holding the balls along the circumference direction at equal intervals; the end surface of at least one of the inner rings protrudes along the axial direction when being compared with the end surface of the outer ring, so that when a rotating shaft is pressed into the inner rings, a clamp does not interfere the outer ring, and the assembling is easy to achieve. In addition, the inner diameters of the inner rings have the layer difference, so that the pressing operation of the rotating shaft can be easily achieved.

Description

Turbosupercharger ball bearing unit

Technical field

The utility model relates to the improvement of ball bearing unit, and this ball bearing unit is for rotating supporting rotating shaft freely with respect to shell, and this running shaft is provided with the impeller and the turbine that form the turbosupercharger using as the pressurized machine of motor at two end part.

Background technique

In order to increase the output of motor in the situation that not changing air displacement, be widely used the turbosupercharger of the air that will send into motor being compressed by the energy of exhaust.

As an example of this turbosupercharger, Fig. 3 has represented the turbosupercharger described in patent documentation 1, and Fig. 4 is the sectional view of the ball bearing unit 7 shown in Fig. 3.

But, in this prior art, be assembled with two itemize row angular contact ball bearing 9,9 and packing rings 15, and the inner ring of two bearings is measure-alike, thus, in the time being pressed into running shaft 2, produce resistance from the chimeric surface of two bearing inner races, thereby have the problem that is difficult to assembling.

In addition, comprise outer ring and outer ring shell interior width dimensions with comprise inner ring and inner ring packing ring is identical at interior width dimensions, thus, in the time being pressed into running shaft to inner ring, need to avoid fixture and outer ring to interfere, there is the problem that is difficult to assembling.

Patent documentation 1: TOHKEMY 2008-298284 communique

Model utility content

The utility model is In view of the foregoing made, for realizing a kind of easy-to-assemble turbosupercharger ball bearing unit that holds.

To achieve these goals, turbosupercharger ball bearing unit of the present utility model, the running shaft of the turbosupercharger that is provided with impeller and turbine at two end part is rotated to the inner side that is bearing in freely shell, it is characterized in that having: near the outer ring that forms and have multiple row outer ring raceway face by single cylinder two ends; There are multiple row and described outer ring raceway face two inner rings of relative inner ring raceway face respectively; The two row balls that roll freely between described outer ring raceway face and described inner ring raceway face; With the retainer that the described ball of two row is along the circumferential direction equally spaced kept respectively, the end face of at least one party's inner ring in two described inner rings, outstanding vertically compared with the end face of outer ring, two described inner rings are provided with: for the described axial rotary portion that is pressed into that two end part internal diameter is pressed into separately; And be pressed between portion and diameter is pressed into the large portion of keeping out of the way of portion than two two, when the described internal diameter that is pressed into portion is made as φ Da, φ Db, φ Dc, φ De distolateral from one, there is the relation of φ Da < φ Db≤φ Dc < φ De.

Brief description of the drawings

Fig. 1 is the sectional view that represents mode of execution of the present utility model turbosupercharger one example, that have ball bearing unit.

Fig. 2 is the sectional view that represents mode of execution of the present utility model ball bearing unit one example, that be pressed into running shaft.

Fig. 3 is the sectional view that represents the ball bearing unit of an example of existing structure.

Fig. 4 is the sectional view that represents a ball bearing unit example, that be pressed into running shaft of existing structure.

Embodiment

Below, with reference to the accompanying drawings of mode of execution of the present utility model.Fig. 1 is the sectional view that represents the ball bearing unit of mode of execution one example of the present utility model, and Fig. 2 is illustrated in the figure that is pressed into running shaft in this ball bearing unit.In addition, of the present utility model being characterised in that, for the structure of the ball bearing unit of supporting rotating shaft 2 freely of the interior sideway swivel with respect to main body cover 6, this running shaft 2 is fixed with turbine 3 and impeller 4(with reference to Fig. 3 in two end part supportings).The structure of other parts is identical with the existing structure shown in above-mentioned Fig. 3, therefore omits diagram.

Ball bearing unit 16 has: near the outer ring 17 that is formed and had multiple row outer ring raceway face 20a, 20b by single cylinder two ends; There are multiple row and above-mentioned outer ring raceway face 20a, 20b two inner rings 18,19 of relative inner ring raceway face 21a, 21b respectively; The multiple ball 22a, the 22b that between outer ring roller surface 20a, 20b and inner ring raceway face 21a, 21b, roll freely; With retainer 23a, 23b that multiple above-mentioned ball 22a, 22b are along the circumferential direction equally spaced kept respectively.

Ball bearing unit 16 is configured to, and making single-row angular contact ball bearing is back side combination, makes outer ring one, and to make inner ring be two.

Above-mentioned inner ring 18,19 is outstanding vertically from the outside end face of right separately outer ring, thus, in the time being pressed into running shaft 26 to inner ring 18,19, can be pressed in the mode that can not make not shown fixture and outer ring interfere.According to the structure of fixture, also can only make the inner ring of any one party outstanding.In addition, by changing the overhang (outstanding length) of two inner rings 18,19, can realize turbine 3 sides of ball bearing and distinguishing of impeller 4 sides.Fig. 1～2 illustrate the overhang of inner ring 18 of impeller 4 sides than the large example of overhang of the inner ring 19 of turbine 3 sides.

And, on outer circumferential face by the protuberance of the inner ring of at least any one party in inner ring 18,19, setting can be installed the seal groove 29 of sealed member 28, thereby can omit seal washer 27(essential in prior art with reference to Fig. 3), therefore, can cut down number of components, cutting down cost, and, also make assembling become easy.

Inner ring 18 is provided with: the 24a of the portion that is pressed into from running shaft 26 to two end part internal diameter, the 24b that are pressed into; And be pressed between the 24a of portion, 24b and diameter is pressed into than two the 25a of the portion of keeping out of the way that the 24a of portion, 24b are large two.Similarly, on inner ring 19, be provided with: the 24c of the portion that is pressed into, the 24d that are pressed into two end part internal diameter for running shaft 26; And be pressed between the 24c of portion, 24d and diameter is pressed into than two the 25b of the portion of keeping out of the way that the 24c of portion, 24d are large two.

Internal diameter φ Da, φ Db, φ Dc, the φ De that is respectively pressed into the 24a of portion, 24b, 24c, 24d becomes order or the diameter that diameter diminishes and becomes large order.But, even if the internal diameter φ Db of the adjacent 24b of the portion that is pressed into and 24c, identical also it doesn't matter for φ Dc.

That is to say, internal diameter φ Da, the φ Db, φ Dc, the φ De that are respectively pressed into the 24a of portion, 24b, 24c, 24d have the relation of following formula.

φ Da < φ Db≤φ Dc < φ De, or

φDa＞φDb≥φDc＞φDe，

Fig. 1～2 have represented that φ Da is the example that minimum diameter and φ Db and φ Dc are same diameter.

At this, the diameter between internal diameter φ Da and φ Db and φ Dc and φ De is poor, is preferably 0.1～2.0mm.In addition, keep out of the way the 25a of portion, 25b and can not contact with running shaft 26, therefore, do not need to grind, can seek the reduction of manufacture cost.

It is the grind section 26a of φ da that running shaft 26 has the external diameter being pressed into the portion 24a of being pressed into, be that the grind section 26c of φ dc and the external diameter that is pressed into the portion 24d of being pressed into are the grind section 26e of φ de to being pressed into external diameter that the 24b of portion, 24c be pressed into.Because want to dwindle grinding scope, so respectively the portion of being pressed into is made as the length of minimum necessary limit, between grind section 26a and 26c, being provided with the external diameter that surface Machining precision is lower is the cutting portion 26b of φ db, and between grind section 26c and 26e, being provided with external diameter is the cutting portion 26d of φ dd.

And each external diameter of running shaft 26 has the relation of following formula.

φda＜φdb＜φdc＜φdd＜φde。

But this is that φ Da is the situation of minimum diameter and φ Db=φ Dc, in the situation that φ Da is maximum diameter, the magnitude relationship of each external diameter can become, the sign of inequality of above-mentioned formula towards becoming contrary magnitude relationship.

In addition, in the situation that internal diameter φ Db is different with φ Dc, be also provided with the portion that is pressed into being pressed into respectively.

In addition, as long as no necessity, cutting portion 26b, 26d also can be set.

Like this, on the internal diameter of inner ring, there is layer poor, thus, in the time being pressed into running shaft, can reduce the unnecessary resistance from chimeric surface, become easy and make to be pressed into.

Claims (1)

1. a turbosupercharger ball bearing unit, rotates by the running shaft of the turbosupercharger that is provided with impeller and turbine at two end part the inner side that is bearing in freely shell, it is characterized in that having:

Form and have the outer ring of multiple row outer ring raceway face near two ends by single cylinder;

There are multiple row and described outer ring raceway face two inner rings of relative inner ring raceway face respectively;

The two row balls that roll freely between described outer ring raceway face and described inner ring raceway face; With

The retainer that the described ball of two row is along the circumferential direction equally spaced kept respectively,

The end face of at least one party's inner ring in two described inner rings, outstanding vertically compared with the end face of outer ring,

Two described inner rings are provided with: for the described axial rotary portion that is pressed into that two end part internal diameter is pressed into separately; And be pressed between portion and diameter is pressed into the large portion of keeping out of the way of portion than two two,

When the described internal diameter that is pressed into portion is made as φ Da, φ Db, φ Dc, φ De distolateral from one, there is the relation of φ Da < φ Db≤φ Dc < φ De.