DE4322761A1 - Rolling contact bearing - Google Patents

Abstract

A rolling contact bearing (1) to accept radial and/or axial forces comprises a pair of inner race wires (2) and a pair of outer race wires (3) arranged coaxially with respect to the latter, on the mutually opposite tracks (4) of which rolling elements (5) roll at a pressure angle, these rolling elements (5) being fixed in their position relative to one another by a cage (6). The intention is that it should be possible to supply this rolling contact bearing (1) fully assembled and to improve the said bearing as regards its rigidity. The object is achieved by virtue of the fact that the race wires (2, 3) are provided at the ends with contact faces (7) which extend in a plane in the radial direction and with an outer lateral surface (8) which extends in a plane in the axial direction. <IMAGE>

Description

The invention relates to a roller bearing for receiving radial and / or axial forces consisting of a pair of inner and one coaxial with this arranged pair of outer race wires, on the opposing raceways rolling elements under one Roll the pressure angle, whereby these rolling elements are closed by a cage others are fixed in their position.

A rolling bearing of the aforementioned type is known from DE-PS 39 39 279 forth.

Both the inner and the outer ring consist of one Plastic strap. Running wires are arranged in ring grooves in these rings net. Furthermore, the inner and / or outer ring can be on the side molded sealing lips that have the same material together have set like the inner and outer ring. These sealing lips extend radially to an outer surface of the other Bearing ring.

The disadvantage of this generic roller bearing is that due to the plastic design of the bearing rings for many applications if there is insufficient storage accuracy. The plastic out formation gives the entire rolling bearing only a low level of rigidity, for example with point loads. Furthermore prove these plastic bearings prove to be insufficient aging, weather as well as temperature resistant. Because of the relatively poor thermal conductivity capability of the plastic there is a risk of high loads  that the resulting frictional heat does not enter the Surrounding construction can be derived and it comes to a premature loss of function of the bearing. In addition, the running wires are in the inner and outer ring of the arrangement described above adequately fixed, that is, they are movable in the circumferential direction the respective grooves added. This also has a negative effect on the rigidity and function of the entire rolling bearing.

In addition, the roller bearing, which is considered to be generic, is one of them assume that due to the relatively inelastic seal, which is known to consist of the same plastic as the bearing rings, only a reduced sealing effect can be expected. The dense lips do not nestle with sufficient elasticity Outer surface of the respective race on or wear out prematurely.

The invention is therefore based on the object, a pre-assembled to create available rolling bearing, in which the disadvantages shown are eliminated and that in particular sufficient rigidity has low cost and manufacturing costs.

According to the invention, this task is performed according to the characterizing part of the Claim 1 solved in that the running wires in front with itself radially extending planar contact surfaces and with an in are provided in the axial direction of the flat outer surface, through which they are directly axially and radially on the component to be stored support, in the direction of a pitch circle of the rolling bearing connect the contact surfaces to sealing surfaces that are connected to the Interact with the cage-connected sealing element. Through the fiction appropriate design is verbes in terms of its rigidity sertes rolling bearing created, it is provided this rolling bearing pre-assembled by the user in the respective adjacent construction to classify. Because of the completely identical design of the interior and outer race wires to each other is just a tool for ferti required both rings. Also within the scope of this invention A solution that is not presented in more detail should also be included in which is in each case on the outer surface of the contact wires Approach pointing in the direction of the transverse central plane. Between  A gap is provided at the ends of two adjacent approaches.

In an embodiment of the invention it is provided in claim 2 that the sealing elements form a gap seal with the sealing surfaces. Because of this gap seal is a simple permanent and low-wear lubrication of the above-mentioned roller bearing secured.

According to claim 3 it is provided that the sealing elements in one piece are formed with the cage and circular from the cage to run inside and outside. This one-piece connection with the cage proves to be cheap in terms of their manufacturing costs. With in other seals are intended to be within the scope of this invention speed of the rolling bearing according to the invention, such as over a single or double lip clinging to the running wires tion, be involved. It would also be conceivable to separate the seal training component and in a suitable manner with the cage connect to.

The sealing surfaces essentially in one plane parallel to the pressure winch arrange the rolling elements is disclosed in claim 4. By this training succeeds in contrast to the aforementioned state of Technically advantageous, the seal inside the end faces of the bearing to arrange and thus save space.

In an advantageous development of the invention, claim 5 relates shows that the cage is designed as a finite band cage with one push is det, wherein on the outer side lying in the axial direction of the Cage overlapping the holding means are provided. Advantageous in this embodiment, it is with only one cage dimension Rolling bearings of any diameter can be manufactured and thus the manufacturing costs are reduced. It will only be one tool type for the Manufacture of a cage for a wide range of roller diameters stock needed. The stops described at this point means for the impact can, but need not, be provided. Of the the same advantage is given by the selected contact wire geometry and ab measurement achieved. For example, a contact wire can have a defined off  education can be used for bearings of different dimensions, or the two outer race wires of a small bearing can be used as inner run wires of a larger size are used.

According to claim 6, the holding means consist of a simple wire, this wire being complementary to its cross-section Recess of the respective side surface of the cage is arranged. Conceivable, and included in the scope of protection, are more Means for securing the position of the cage ends, e.g. B. clips, brackets or Snap connections, the latter also originating from the cage itself can and all types of connections from the most diverse Materials or their combinations are conceivable.

Train the cage so that it supports the roller bearing on at least one Slightly overhanging the end face is described in claim 7, wherein emerges from claim 8, the cage from an elastic and / or to manufacture elastomeric material. Solutions are also provided for which the cage does not protrude from the end faces of the rolling bearing, or the cage is completely dispensed with, i.e. a full spherical one Variant is proposed. Due to the preferred design of the cage made of plastic contributes to reducing the mass of the entire rolling element camp done. However, cages made of light metal would also be conceivable or similar. In this case either the intended seal would have to subsequently connected to the cage in a suitable manner or else it can be on the gasket for special application cases are waived. However, it is an advantage to have one Provide external lubricant supply for the entire rolling bearing.

In an advantageous development of the invention, claim 9 shows that the running wires are symmetrical and have opposite careers. This training is a Running wire of defined geometry simultaneously as an inner or outer ring applicable.

According to claim 10, the outer race wires by an annular Conveyor belt must be kept. This band is preferably elastic and designed closed and prevents the running wires from opening.  

During operation of the rolling bearing according to the invention, this can Conveyor belt remain in it.

It is apparent from claim 11 that in the area of the wire bed radius R at least one elastic plastic ring is inserted, in Claim 12 is more specific that the plastic ring, the contact surface and encloses the outer surface of the running wires. This elastic Plastic ring, a round cord ring or the like is also conceivable is advantageously embedded in all four wire bed radii. It is also intended for the internal and external raceway of the roller each have a closed plastic ring, such as a U-shaped cross cut to use. This measure makes this roller bearing improved in terms of its noise emission. Such a rolling camp is also without the conveyor belt described in claim 10 conceivable, possibly also ver on the sealing measures described can be waived.

A solution is also intended to be within the scope of this invention be related, in which the running wires and / or the rolling elements with a wear-reducing layer are provided. Through this applied Layer, for example PTFE or silver, succeeds the tribologi conditions in the rolling bearing presented here and to increase its lifespan. If necessary, a lubrication of the rolling bearing can be dispensed with.

The invention is not only based on the features of its claims limits. Combination options are also conceivable and envisaged individual claim characteristics and possible combinations of individual Claim features with that in the information on benefits and Ausgestal Example disclosed.

The invention is shown in the drawing. Show it:

Fig. 1 shows a cross section through an inventive roller bearing and

Fig. 2 shows a detailed design of the embedding of a running wire in its wire bed radius.

From Fig. 1, the expert can see a cross section through an inventive rolling bearing 1 inven tion. This consists of a pair of inner and a pair of outer races 2 , 3 . Rolling bodies 5 formed as balls roll on their mutually opposite raceways 4 . A cage 6 fixes the rolling elements 5 in relation to one another. In the radial direction of the running wires 2 , 3, he stretch front flat contact surfaces 7 and in the axial direction Rich flat surfaces 8th About the contact surfaces 7 and the outer surfaces 8 , the contact wires 2 , 3 are supported on a construction 10 Umweltkon. The running wires 3 can be held by an annular conveyor belt 9 , in particular with larger running wire diameters. In the direction of the pitch circle of the rolling bearing 1, 7 sealing surfaces 11 adjoin the contact surfaces. These sealing surfaces 11 cooperate with a sealing element 12 extending from the cage 6 and form a gap seal.

As can also be seen from the single figure, the sealing elements 12 are connected in one piece to the cage 6 and protrude beyond the rolling bearing 1 at the end.

The cage 6 is made of flat material and formed as a finite band cage with a joint 12 a. On the side faces 13 of the cage 6 lying on the outside in the axial direction, a wire 14 which overlaps the joint 12 a is provided. This wire 14 is snapped into a complementary to its cross section 15 of the respective side surfaces 13 of the cage 6 . Based on the inner running wires 2 it is indicated that it can be provided to see the running wires 2 and / or the rolling elements 5 with a wear-reducing layer 16 ver.

Since the running wires 2 , 3 are symmetrical in cross-section and have groove-shaped raceways 4 , the wire bet tradius R can be made more generous. Because the wires 2 , 3 are no longer in contact with the radius of their bed due to their special design, the manufacturing tolerances for this area can be expanded.

From Fig. 2 it can be seen that a plastic ring 19 can be inserted to reduce the noise radiation of the rolling bearing 1 in the wire bed radii R.

Reference list

1 roller bearing
2 inner race wires
3 outer race wires
4 careers
5 rolling elements
6 cage
7 contact surface
8 outer surface
9 conveyor belt
10 component, surrounding construction
11 sealing surface
12 sealing element
12 a shock
13 side surface
14 wire
15 recess
16 layer
18 end face
19 plastic ring
R wire bed radius

Claims (12)

1. Rolling bearing ( 1 ) for absorbing radial and / or axial forces, consisting of a pair of inner and a coaxial to this angeord Neten pair of outer race wires ( 2 , 3 ), on their mutually opposite raceways ( 4 ) rolling elements ( 5 ) roll at a pressure angle, these rolling elements ( 5 ) being fixed to one another in their position by a cage ( 6 ), characterized in that the running wires ( 2 , 3 ) have front faces with contact surfaces ( 7 ) which extend in the radial direction and with an outer circumferential surface ( 8 ) which is flat in the axial direction and by means of which they are supported axially and radially on the component ( 10 ) to be supported, sealing surfaces ( 7 ) contacting the contact surfaces ( 7 ) in the direction of a partial circle of the rolling bearing ( 1 ). 11 ) connect, which cooperate with a cage ( 6 ) connected sealing element ( 12 ). 2. Rolling bearing according to claim 1, characterized in that the sealing elements ( 12 ) with the sealing surfaces ( 11 ) form a gap seal. 3. Rolling bearing according to claim 1, characterized in that the sealing elements ( 12 ) are integrally formed with the cage ( 6 ) and extend annularly from the cage ( 6 ) inwards and outwards. 4. Rolling bearing according to claim 1, characterized in that the sealing surfaces ( 11 ) extend substantially in a plane parallel to the contact angle of the rolling elements ( 5 ). 5. Rolling bearing according to claim 1, characterized in that the cage (6) is designed as a finite band cage with an abutment (12 a), wherein outside in the axial direction side surfaces (13) of the cage (6), the joint (12 a) comprehensive holding means are provided. 6. Rolling bearing according to claim 5, characterized in that the holding means consist of a wire ( 14 ), said wire ( 14 ) in a complementary to its cross section recess ( 15 ) of the respective side surface ( 13 ) of the cage ( 6 ) is. 7. Rolling bearing according to claim 5 or 6, characterized in that the cage ( 6 ), the rolling bearing ( 1 ) on at least one end face ( 18 ) ge slightly protrudes. 8. Rolling bearing according to claim 1, characterized in that the cage ( 6 ) is formed from an elastic and / or an elastomeric material. 9. Rolling bearing according to claim 1, characterized in that the running wires ( 2 , 3 ) are symmetrical in cross section and identify opposite raceways ( 4 ). 10. Rolling bearing according to claim 1, characterized in that the two outer race wires ( 3 ) are held in the radial direction by an annular trans port belt ( 9 ). 11. Rolling bearing according to claim 1, characterized in that in the region of the wire bed radius (R) at least one elastic plastic ring ( 19 ) is inserted. 12. Rolling bearing according to claim 11, characterized in that the plastic ring surrounds the contact surface ( 7 ) and the outer surface ( 8 ) of the barrel wires ( 2 , 3 ).