San Antonio light. [volume] (San Antonio, Tex.) 1911-1993, 1923-10-21
NEW POROUS 4
| BRONZE METAL
| |SPERFECTED
Absorbs Oils or Greases Up
to Is Per Cent Of
Bearing.
USES ARE MANY
Durex Is Name Given New
Bronze by General !
/ Motors.
USES ARE MANY

.ral Motors Corporation has perfect
ID new porous, oil-absorbing, copper
lin bearing bronze. The new product,
ihe result of long and exhaustive ex-
4eriment and test, possesses a large
lumber of pores, which will absorb
ubricating oils or greases up to % per
TENT of the volume of the bearing. I'm
Her test it has been found of use IN
Hny place in which bearing materials
IRE ordinarily used. and in many caSes
las even satisfactorily repealed ball
Ind roller bearings.
Thousands of tiny pores, uniformly
distributed throughout Durex. give the
bacterial the absorptive qualities Of a
Hotter or a wick. An interesting dem
of this characteristic is
nade by fitting an Ordinary old-fash-
pned kerosene lamp with a Durex
flushing in place of the usual cotton
flick. The bushing can be lighted and
E-ill continue to burn as long as there
IS oil in the lamp.
! Durex not only soaks up oil, but,
That is more important still in a
Fearing. the oil will not drain out
|lgain. After a Durex bearing has been
6hked in oil it will always thereafter
resent an oily surface. When the
Fearing surface has been wiped free
oil, in a very short time a coating
"a oil reforms on it. This ability to
hplenish quickly an oil film on its
flrface is obviously an outstanding ad.
Eantage in bearing, az this character
Bite insures the installation against
Eunning dry.
q Uses Are Many.
\ There are many places in which
3urex can be utilized without provi.
ion for additional fabrication and
Earrings of this type have run as long
Is 10000 hours at 1000 r. p. M, on
T-S-inch diameter shaft. loaded heavi-
fabricated only with the oil con-
5Ained in the bushing walls.
n In some installations, OF course, the
{hpply of lubricant held within the
balls of the bearing material should
lot be relied on for continual lubri-
It;on but should be- considered as a
|fserve for emergencies. Durex bear
|rgs that are heavily loaded require
Ih additional supply OF lubricant. BY
irtue Of its ability to function in the
hme manner as a wick. the bearing
[Irface may be continually supplied
fith an evenly distributed film of oil.
Mis- is accomplished with the usual
kip oiler. with the oil hole terminating
b the outside of the busbing, or with
be standard wick oiler. For heavy
{uty bearings. when oil must be avail
BILE in larger quantities than could
= fed through the pores in the bush.
|rg alone, the oil duct may be led
through the bushing to the SHIFT, in or
pr that necessary oil may be avail
bic.
| Durex bearings may be filled with
Inv kind of lubricatng, oils or greases;
he selection of lubricating medium
|hould. of course, be governed by the
Ipndtions under which the bearing is
t. be used.
In addition to its lubricating fea'
Iires. Durex contains materials which
e evenly distributed throughout the
ass and this insures bushing which
ill not gall and which has a low CO.
Efficient of friction. This combina-
Ion of efficient fabrication and low
Eictional properties gives Durex a
,rprising ability TO resist wear.
Pleased With Showing.
General Motors Research engineers
.e well pleased with the showing that
ie new material has made in SER
zee. Bushings may be made in any
tsired size. The relation OF wall
lickness to length and diameter of
hshing will naturally be governed by
e principles applying to the design
ball bearings.
Durex bearings are installed in the
1llowing manner: The bearing is
aced on a hardened plug of the de-
Fed size of the finished hole. The
faring and plug are then pressed
to position in the casting or bearing
ceiver. The press fit is made from
O3-inch to .OO5-inch. After pressing
to position, the plug is removed.
living the hole of exact size and in
homer alignment. This method of in
allation eliminates finish roaming.
Bearings made of Durex give best
suits when the running clearance is
4 less than .OO05-inch for shafts up
53S-inch diameter and not less than
b15-inch for shafts 5-S-inch to H.
ch in diameter. Best results have
en- obtained. using hardened and
ound shafts; however: many instai,
hons are very successful, using cold
led shafting.
Users of Durex bearings are eau
bned against Furnishing the bearing
race or using any method OF ma
lining that tends to close the pores
the bearing surface,
Physical properties OF Durex bear
metal are ms follows:
Brinels hardness, 1910; scleroscope
rdness. 1918: modulus of elasticity,
zoo 600: weight. 3.5 OF. er GU. in;
celtic gravity. $40: oil absorption,
ner cent nv volume; comnressive
hstic limit, 1000 lbs. to 10000 lbs.
r 50. in, depending on compost
PM