U.S. patent application number 09/747861 was filed with the patent office on 2002-03-14 for roller cage for a deep rolling work roller.
This patent application is currently assigned to Hegenscheidt-MFD GmbH & Co. KG. Invention is credited to Heimann, Alfred, Zimmerman, Hans.
Application Number | 20020029600 09/747861 |
Document ID | / |
Family ID | 7656049 |
Filed Date | 2002-03-14 |
United States Patent
Application |
20020029600 |
Kind Code |
A1 |
Heimann, Alfred ; et
al. |
March 14, 2002 |
Roller cage for a deep rolling work roller
Abstract
A roller cage (6) is provided for a minimum of one work roller
(3) of a tool for deep rolling of grooves or radii of a crankshaft
bearing (1) where the work roller (3) at a section of its
circumference is loosely guided by the roller cage (6) or inside a
concave void of the roller cage (6). Portions of the roller cage
(6) by which the work roller (3) is guided, consist of a material
that dispenses solid lubricant to the work roller (3).
Inventors: |
Heimann, Alfred; (Archen,
DE) ; Zimmerman, Hans; (Selfkant, DE) |
Correspondence
Address: |
William S. Gottschalk
CARLSON, GASKEY & OLDS, P.C.
Suite 350
400 W. Maple Road
Birmingham
MI
48009
US
|
Assignee: |
Hegenscheidt-MFD GmbH & Co.
KG
|
Family ID: |
7656049 |
Appl. No.: |
09/747861 |
Filed: |
December 22, 2000 |
Current U.S.
Class: |
72/110 |
Current CPC
Class: |
B21H 7/185 20130101;
B24B 39/04 20130101; B24B 5/42 20130101; B24B 57/04 20130101; B21B
45/0263 20130101 |
Class at
Publication: |
72/110 |
International
Class: |
B21D 015/00 |
Foreign Application Data
Date |
Code |
Application Number |
Sep 12, 2000 |
DE |
10045258.2 |
Claims
1. A deep rolling tool for rolling the grooves on crankshaft
journals comprising: a cage having a recess and a pocket proximate
said recess; a work roller received by said recess; and a solid
lubricant material insert disposed in said pocket and adjacent said
work roller for lubricating said work roller.
2. The tool according to claim 1, wherein said cage is constructed
from metal.
3. The tool according to claim 2, wherein said metal is bronze.
4. The tool according to claim 1, wherein said solid lubricant
material insert is graphite.
5. The tool according to claim 1, wherein said cage is a sintered
metal.
6. The tool according to claim 5, wherein pressurized lubricant is
applied to said cage.
7. The tool according to claim 1, wherein said solid lubricant
material insert is a sintered metal.
8. The tool according to claim 7, wherein pressurized lubricant is
applied to said solid lubricant material insert.
Description
RELATED APPLICATIONS
[0001] This application claims priority to German Patent
Application No. 10045258.2, filed Sep. 12, 2000.
BACKGROUND OF THE INVENTION
[0002] The invention concerns a roller cage for a minimum of one
work roller of a tool for deep rolling of grooves or radii of
crankshaft bearings, where the work roller is loosely guided at a
section of its circumference, either by the roller cage or in a
concave recess of the roller cage.
[0003] A prior art deep rolling tool is described in European
Patent Application EP 0 839 607 A1. Deep rolling work rollers
typically are loosely guided in roller cages identified by
reference number 15. The roller cages are attached to the external
end of the long leg of an L-shaped tool holder.
[0004] The deep rolling work rollers are described in U.S. Pat. No.
5,806,184. The work rollers are guided in roller cages. Work
rollers for the deep rolling of grooves or radii of crankshaft
bearings are highly stressed tools. Their wear and tear occurs, for
example, by material chipping similar to that experienced in gears
or in rolling elements of rolling bearings.
[0005] In a deep rolling tool known in the art, the work roller is
vertically supported from above by one guide roller each. The total
load applied to the work roller is generated by the contacts
between the work roller, the guide roller, the crankshaft and the
roller cage. Of the two roller cages, each located opposite one
work roller, only the one located in the crankshaft drive direction
is subject to wear. A generally known practice for reduction of
this wear and tear is to offset the work roller by a small amount,
relative to a line formed by the crankshaft axis and the guide
roller.
[0006] Work rollers are, however, not only stressed by pressure,
but there is also slippage between the work roller, the crankshaft
and the guide roller, since their effective radii roll off
differently. The roller cage transfers the so generated rolling
force directly to the work roller and is, for this reason, severely
stressed by the slipping action, and wears fast accordingly.
Previously this type of wear has been counteracted by applying oil
lubrication or oil-air-lubrication using rolling oil, to the deep
rolling tools. For oil lubrication a thin-bodied oil (5 CST) is
used feeding very generous amounts.
SUMMARY OF THE INVENTION
[0007] The object of the invention calls for a reduction of wear
for the roller cage. The means used for this purpose should be easy
to handle, reliable in operation, and also reasonably priced.
[0008] The object of the invention is attained in that at least
those portions of the roller cage, or those sections of the concave
recess at which, or in which, the work roller is guided in the
roller cage, consist of a material that dispenses solid lubricant
to the work roller. One suitable material of this type is, for
example, graphite. A block of graphite is placed in a void of the
roller cage and, during deep rolling, dispenses graphite particles
to the work roller to provide lubrication.
[0009] Wear and tear of the graphite-holding portion of the roller
cage is controlled in a simple manner by dimensioning the remaining
portions of the roller cage not containing graphite, small enough
to allow at all times a sufficiently large graphite layer to be
removed along with their wear. These relationships are determined
from case to case experimentally.
[0010] Materials other than graphite may also be utilized as a
solid lubricant, such as MOS2. Also, the application of a sintered
metal material for the roller cage may be considered. The porosity
of the sintered metal material supports the application of a
lubricant under external pressure. The lubricant passes through the
sintered metal material and exits at places where the roller cage
is in contact with the work roller.
BRIEF DESCRIPTION OF THE DRAWING
[0011] In the following the invention is described in more detail
based on one embodiment. In a very simplified and schematic view
the following is shown:
[0012] FIG. 1 a side view of the engaged components of a deep
rolling tool, and
[0013] FIG. 2 a roller cage containing a lubricant dispensing
element.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
[0014] Number 1 in FIG. 1 refers to a circle representing the
circumference of a bearing of a crankshaft. The crankshaft 1
rotates in the direction of the arrow 2. A deep rolling work roller
3 engages a groove (not shown) of the crankshaft 1. In the vertical
direction the work roller 3 is supported from above by a supporting
roller 4 which, in turn, rotates in the direction of the arrow 5.
The working roller 3 is loosely guided by a roller cage 6 which
contacts the work roller 3 in the direction of the arrow 7. The
area of contact between the work roller 3 and the roller cage 6 is
shown enlarged in FIG. 2. The roller cage 6 contains a void 11. A
graphite block 8 is inserted in the void 11, representing the
direct contact between the roller cage 6 and the work roller 3. The
relationship of the contact area 9, between the face of the
graphite block 8 and the work roller 3 and the surfaces 10 of the
wall of the roller cage 6 laterally supporting the graphite block
8, is designed so that in the course of wear of the roller cage 6 a
sufficient amount of graphite can be transferred to the work roller
3 from the graphite block 8 at all times. The specific ratio of the
surface areas under consideration is determined experimentally.
[0015] The invention has been described in an illustrative manner,
and it is to be understood that the terminology that has been used
is intended to be in the nature of words of description rather than
of limitation. Obviously, many modifications and variations of the
present invention are possible in light of the above teachings. It
is, therefore, to be understood that within the scope of the
appended claims the invention may be practiced otherwise than as
specifically described.
* * * * *