DE8712707U1 - bearings - Google Patents

Description

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Hanning Elektro=Werke GmbH & Co ₄ , D-4811 Oerlinghausen

bearings

The invention relates to a plain bearing which has a |

bearing shaft in the bearing area enclosing bearing body 1

1. Such plain bearings are available as sintered metal and f

s Massivglextlager known. I

Sintered metal plain bearings are used primarily in precision mechanics and in small electric motors.

ä scope of use. Due to their porous structure |

they have the ability to store liquid lubricants

and to the surface of the shaft during operation. The storage capacity varies depending on the structure density. If the pores are too large,
the risk of too much lubricant being released and
This results in losses. On the other hand, a pore structure that is too fine has the disadvantage that, due to the capillary |

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noise effect the lubricant release is too low.

The hydrodynamic conditions in a sintered metal plain bearing are very difficult because the porous structure makes it difficult to achieve hydrodynamic lubrication, as the lubricant is pushed back into the pores of the bearing body as soon as pressure builds up in the bearing gap. Only after a long running-in period does a sliding surface form in the bearing bore, which enables the formation of a lubricating film. A sintered metal plain bearing is therefore always a compromise in terms of wear behavior, but one that is accepted in view of the low costs.

The situation is clear with solid plain bearings. A hydrodynamic lubricating film is always formed that is so good that mixed friction no longer exists and the bearing works practically wear-free. The disadvantage of such solid plain bearings is that they cannot store a lubricant supply without additional, complex measures*

The object of the invention is to combine the good properties of a sintered metal plain bearing with the properties of a

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solid plain bearing.

The solution to the problem is achieved by a composite bearing in which solid bearing bushes are embedded in the porous bearing body. This results in perfect hydrodynamic lubrication in the area of the solid bearing bushes, while the porous part of the bearing body takes over the storage and circulation of the lubricant. The result of this combination is a cost-effective bearing which successfully avoids the disadvantages of pure sintered metal plain bearings and solid plain bearings.

Embodiments and further features of the subject matter of the application are evident from the drawing. In Figs. 1 to 4, this shows a shaft to be supported 1 with a bearing gap 2 enclosing porous bearing bodies 3 in axial section, in which solid bearing bushes 4 are embedded. The bearing bushes 4 are made of

j made of metal or plastic and the

! have different arrangements.

In all possible configurations, the massive

Bearing bushes 4 as load-bearing parts, while the porous bearing bodies 3 have the task of storing lubricant

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and circulation. The latter also applies to the bearing structure shown in Fig. 4, which differs from the other designs in that the bearing bush 4 towards the shaft 1 is also covered by the porous material of the bearing body 3, but only in a very thin layer 5. Thus, in this case too, the pressure builds up between the shaft 1 and the inserted solid bearing bush 4, and the thin layer 5 of porous material only serves to significantly improve the lubricant transport into the bearing gap 2.

Claims (2)

Il 3 # ■ t · K > till» *■ ■ ■ 1197 Harming Elektro-Werke GmbH & Co., D-4811 Oerlinghausen Plain bearings Protection claims: 1. Plain bearing, which has a bearing body enclosing the shaft to be supported in the bearing area,
characterized in that solid bearing bushes (4) are embedded in a porous bearing body (3) made of metal or plastic, which has different outer contours depending on the application and which, together with the porous bearing body (3), form a bearing gap (2). 2. Plain bearing according to claim 1, characterized in that the solid bearing bushes (4) are each arranged in the porous bearing body (3) at a distance from the end faces of the latter on both sides. ti t . . . I Il »«II I* &Igr;·«&igr; I &igr; , Il I I III &igr; It ) f «III ¹ , ( . I 1111' ■ It I * III It I ItI 4ill I << ' 11 mi J is i I JlI* 1 ij &igr; · i - 2 - 1197 § 3· Plain bearing according to claim 1, characterized in I that the massive bearing bushes (4) are each provided with a "' of the end faces of the porous bearing body (3) curse ten. p 4. Plain bearing according to one of the preceding claims, _&iacgr; characterized in that the porous bearing body (3) embedded massive bearing bushes towards the bearing gap (2) by a thin layer (5) covered with porous material. It ·I»I ·