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Title:
MONOBLOC PRESSED PLATE IDLER ROLLER BEARING HOUSING WITH AXIAL LOCATION SHOULDER
Document Type and Number:
WIPO Patent Application WO/2011/138796
Kind Code:
A1
Abstract:
This invention relates to monobloc pressed plate idler roller bearing housings with built in axial location shoulder. Pressed plate bearing housings and polymer inners seals for use in Idler Roller assembly are well known in the art. Presently, there is a tendency of the bearing to have a tilted seat in the assembly due to absence of rigid abutment face. The invention provides axial location shoulder face (3) perpendicular to the bearing axis, in pressed plate idler roller bearing housing (1). A separate bearing axial location shoulder (3) is fastened to the bottom of bearing housing cup (1) and is machined in- situ in fastened condition.

Inventors:
SHIWALKAR PRAFULLA BHASKAR (IN)
SHIWALKAR ABHISHEK PRAFULLA (IN)
Application Number:
PCT/IN2011/000306
Publication Date:
November 10, 2011
Filing Date:
May 03, 2011
Export Citation:
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Assignee:
SHIWALKAR ENGINEERS & CONSULTANTS (IN)
SHIWALKAR PRAFULLA BHASKAR (IN)
SHIWALKAR ABHISHEK PRAFULLA (IN)
International Classes:
F16C13/02; B65G39/09
Foreign References:
FR1581119A1969-09-12
DE2024448A11971-12-02
US2702868A1955-02-22
FR1529170A1968-06-14
US3345115A1967-10-03
CH313071A1956-03-15
Other References:
None
Attorney, Agent or Firm:
VANDANA VILAS VAIDYA (III MainBrindavan Extension, Arekere,Mico Layout, B.G.Road, Bangalore 6, IN)
Download PDF:
Claims:
WE CLAIM:

1. A MONOBLOC PRESSED PLATE BEARING HOUSING FOR CONVEYOR IDLER ROLLER WITH A BUILT IN METAL AXIAL LOACTING SHOULDER.

2. THE COMPONENT AS CLAIMED IN 1 COMPRISING OF METAL AXIAL LOCATING SHOULDER FASTENED TO THE BOTTOM OF CUP OF PRESSED PLATE BEARING HOUSING AND MACHINED PERPANDICULAR TO THE BEARING AXIS IN-SITU .

Description:
MONOBLOC PRESSED PLATE IDLER ROLLER BEARING HOUSING WITH AXIAL LOCATION SHOULDER

Background of the invention :-

This invention relates to monobloc pressed plate idler roller bearing housings with built in axial location shoulder. Pressed plate bearing housings and polymer inners seals for use in Idler Roller assembly are well known in the art. Schematic of Idler Roller is illustrated in Figure 6. Currently, pressed plate bearing housings are pressed out of 4.0/5.0/6.0/8.0 mm thick plates/sheets. These are pressed in various styles, style being user specific. Various but not all styles are illustrated in Figure no. 5. Conventionally,a pressed plate bearing housing has a comer radius of 3.0 mm to 4.0 mm. The bearing has a comer radius of 1.5 to 2.0 mm.It is not practical to coin a sharper comer radius in plate bearing housings.lt is disproportionately difficult to do so and it leads to disproportionate distortions in the bearing seat zone of housing.

Hence it is not possible to rest the bearing face on the bottom face of the bearing housing. Sharper comer radius of bearing will dig into larger corner radius of plate bearing housing. This is illustrated in Figure no. 4.

Bearing manufacturers strongly recommend use of steel axial location shoulder for the outer race of housing.

" An interference fit alone is inadequate for the axial location of a bearing ring.The ring having a tighter fit;outer ring in idler rollers, should be axially secured.Abutments for bearing rings should have a re ct angularity tolerance as defined in( ISO 1101 :2004 DIN 6320), which is better by at least one ΓΓ grade than the diameter tolerance associated with cylindrical seating."

Currently ,the problem of bearing comer radius digging in housing inner comer radius is tackled by providing a polymer inner seal between bearing and housing bottom.

Inner seal performs 3 functions:

1. Retains lubricant from the bearing in the assembly.

2. Prevents bearing corner radius from digging in to bearing housing corner radius.

3. Prevents ingress of water and contaminant fro inside of shell into bearing.

However the polymer inner seal does not perform as an axial location shoulder because it is not rigid and can deform under load.

Typically ,bearing has a low Length/Diameter ratio. Hence a rigid and perpendicular face location is very essential for proper seating. ( ISO 1101:2004/DIN 6320) are recommended geometric tolerances, and geometrical tolerance for face perpendicularity is grade 6. This can not be ensured in a standalone plate housings with or without polymer inner seal. The roller shaft is slender,it has a got a very low IJD ratio.The shaft is not rigid enough( in bending) to correct the bearing misalignment inevitable in assembly due to absence of a perpendicular axial locating shoulder. This is illustrated in Figure no. 3.

A need is therefore strongly felt to develop a pressed plate bearing housing with an axial location shoulder perpandicular to the axis and with lubrication retaining properties to overcome these difficulties of prior art patents and practices.

The object of the present invention is therefore to provide a monbloc pressed plate bearing housing with a built in axial location shoulder and an inner seal to retain lubricant.

OBJECT OF THE PRESENT INVENTION The object of the present invention is:

1.To provide a pressed plate bearing housing mat provides a built in metal axial location shoulder.

2. To provide a pressed plate bearing housing with a built in metal axial location shoulder which also provides a perpandicular abutment to the bearing.

3.. To provide a means mat performs the function of providing adequate abutment and axial location to the bearing AND also acts as a lubricant retainer.

DESCRIPTION OF FIGURES

The features of the present invention which are believed to be novel are set forth with particularity in the attached Figures.The invention may best be understood by referring following description in conjunction with attached Figures.

Figure 1: Shows the schematic of complete bearing housing (1) wilh bearing (2) , axial location shoulder (3) and polymer inner seal (4). It also shows welding (5).

Figure 2: Shows the schematic of complete bearing housing (1) with bearing (2) , axial location shoulder (3) and without a polymer inner seal.

Figure 3:- Illustrates sharper bearing comer chamfer digging in a relatively larger bearing housing comer radius.

Figure 4 :- Illustrates various styles of pressed plate bearing housings currently in use. Figure 5:- Illustrates tilted resting of bearing on polymer inner seal.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

We now discuss the best mode for carrying out me invention.The invention deals with manufacturing a pressed plate bearing housing with a built up steel axial location shoulder . This may house a polymer inner seal (Figure 1) or may perform additional function of inner seal(Figure 2)

A pressed plate bearing housing (1) has a cup and a shoulder or a flange. The inside comer radius of the cup is 3.0mm/4.0mm.

Bearing axial location shoulder (3) is fabricated out of steel .It is a snug fit in the cup and the outer corner radius is larger than the inner comer radius of the bearing housing cup.

Bearing axial location shoulder (3) in Figure 1 houses a polymer inner seal which retains the lubricant in the bearing.

Bearing axial location shoulder (3) in Figure 2 does not house a polymer seal. It is a U shaped shoulder with an inner projection.

The bearing axial location shoulder (3) is inserted in the bearing housing cup and rests on the bottom inside face.(Figure 1& Figure 2)

Bearing axial location shoulder (3) is Ihen welded or fastened by any olher means to the bearing housing. (Figure 1 &Figure 2).

The welded/fastened bearing axial location shoulder (3) is then machined in-situ to achieve a perpendicularity of 0.1 mm TIR with respect to the axis of bearing housing AND to achieve a cup depth tolerance of 0.1mm.

The U shaped axial location shoulder is so mahined in-situ that inner lip maintains a gap of 0.2 mm with the face of inner race of the bearing.This gap of 0.2mm restricts the outward flow of viscous lubricant and inward flow of water and contaminant.

It is therefore, disclosed by this invention, a method of creating a perpendicular, rigid, resting face for bearing in a pressed plate bearing housing. It is also disclosed by this invention , a method of controlling cup depth within a tolerance of 0.1 mm in pressed plate bearing housing.

Thus, while there have been shown and described and pointed out fundamental novel features of the present invention as applied to preferred embodiments thereof, it will be understood that various ommissions and substitutions and changes in the form and details of the methods described may be made by those skilled in the art without departing from the spirit of the present invention. For example it expressly intended that all combinations of those elements and/or method steps which perform substantially the same function in substantially the same way to achieve the same results are within the scope of the invention. Substitutions of elements from one described embodiment to another are also fully intended and contemplated.