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Патент USA US2404573

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My 23, 1946..
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w GRfAF
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GEAR
GRINDING
MACHINE
Filed March 20, 1944
/ 2,40%,573
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3 Sheets-Shae’: l
July 23, 1946.
w, GRAF
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2,404,573 '
GEAR GRINDING MACHINE _
Filed March 20, 1944
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3 Sheets-Sheet 2
‘July 23, mm "
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GEAR GRINDING MACHINE
Filed. March 20, 1944
3 Sheets-Sheet a
2,404,573
Patented July 23,_ 1946 ’
UNITED STATES PATENT OFFICE
.‘ 2,404,573
GEAR GRINDING MACHINE
Willi Graf, Zurich, Switzerlaniassighor to Maag
Zahnrader und -Maschinen Aktiengesellschaft,
Zurich, Switzerland
Application March 20, 1944', Serial No. 527,270
In Switzerland Jan. 25, 1943
4 Claims.
.
(01. 51—123)
1
This invention relates to gear grinding ma
chines operating by means of relative rolling
motion of involute form.
Owing to the continuously growing tendency
to increase the stressing of hardened ground
gears and the resulting elastic deformations of
cooperating gear teeth, Wherefrom flattening
and permanent de?ecting ensues, it becomes
necessary to give a form to the tooth ?anks de
2.
Fig. 11 shows a cross section on the line XI—-XI
in ‘Fig. 10.
On the bed 5 of the machine shown in Figs. 1
to 6 a slide 2 is arranged for movement parallel
with the longitudinal axis of the machine. The
drive of the slide 2 is derived, in a known man
ner, from a motor 39 via a gear wheel transmis
sion gearing 4t and a screw spindle M, A sec
ond slide 3 is mounted on the slide 2 for move
ment perpendicularlyv to the longitudinal axis of
viating from the true involute.
the machine. The drive of this slide is also de
Devices serving this purpose are already
rived from the motor 39 via a belt 42 and a crank
known. One type of such devices consists in that
pin 43. Between the centering points of the slide
the rolling are which for producing the rolling
3 a mandrel 4 is clamped for carrying the work
motion rolls on stretched tapes is given at certain
points of its circumference a form which devi 16 5. The compound movement of the work 5 car
ries it in a de?nite path relative to grinding
ates from the circular form. This results in a
wheels 29 which are mounted on a ?xed part of
corresponding alteration of the rolling motion,
the machine frame and are rotationally driven by
due to which, for example, the face of the tooth
electric motors 29.
is ?attened to some extent compared with the
Further, the slide 3 includes a shaft 6 (Fig. 4)
theoretical involute form so that the teeth enter "
on one end of which a rolling arc ‘I is mounted
into mutual engagement free from shocks.
which is connected by means of .tensioned steel
In the gear grinding machine according to the
tapes 8 (Figs. 2 and 5) with two holders 9 which
present invention the same purpose is intended
to be served in a more precise and effective man
ner in that between the rolling elements and the
work carrier a device including a diverting mem
are screwed to the slide 2. In the shaft 6 is ro
>~ tatably mounted a further shaft l0 which carries
a dividing disc H as well as one of the centering
points between which the work supporting man
ber is intercalated which member is temporarily
drel 4 is clamped. The other end of the shaft
de?ected, while the rolling motion progresses, the‘
6 is ?rmly connected to a casing i2. ‘ In the lat
extent of de?ection being transmitted to the
Work carrier, whereby the work has imparted 30 ter a plug i3 is mounted which is eccentrically
arranged relative to its axis and houses a shaft
thereto corresponding movement in addition to
14. On this shaft two lever arms are secured.
said normal rolling movement.
One of said lever arms which is designated by
Advantageously, the diverting member is ar
ranged for cooperation with cam means which,
for the purpose of being adaptable to the extent
of de?ection required, are exchangeable and ad
justable relative to the diverting means.
Two embodiments of the invention are illus
l5 carries a bolt l6 which engages into the
; tooth gaps of the dividing disc ll. The other
lever arm I‘! serves for disengaging the bolt l6
from the dividing disc H and engaging it with
the latter again in the manner of a pawl in the
course of the dividing operation. This bolt con
40 trol is. e?ected by means of an eccentric l8 on
panying drawings, in which
which rests the outer end of the lever arm I l and
Fig. 1 shows an elevation of a gear grinding
trated, by way of example only, in the accom
machine;
Fig. 2 shows an end elevation thereof;
Fig. 3 is a partial View of Fig. 2 on a larger
scale;
Fig. 4 is a longitudinal section of vthe dividing
device of the machine;
Fig. 5 shows a cross section on the line V—~V
in Fig. 4;
>
Fig. 6 shows a cross section on the line VI-VI "
in Fig. 4;
Figs. 7 to 9 show modi?ed tooth pro?les;
Fig. 10 shows an elevation partly in section
of a gear grinding machine representing a sec
ond embodiment of the invention, and
which is temporarily turned by the dividing shaft
2] via a pair of bevel wheels 19, 20. A spring 22
exerts tension on the lever arm ll, thereby urg
ing the bolt I6 against the dividing disc H.
For realizing the modifying of the tooth-pro?le
striven at, a diverting member in form of a lever
arm 23 carrying on its outer end a guide roller
24 is ?rmly keyed to the plug Hi.
This roller
slides on a guide segment 25, which is ?rmly I
screwed to a ring 21, by pressure action exerted
on the roller by means of a spring 38. Thisring
is rotatably mounted in a ?xed holder 28 which
in turn is mounted on the slide 3. At both ends
of the guide segment 25 cam pieces 26 are ar
2,404,573
3
ranged.
V
These are so disposed that the guide
.
4
ments about the axis ofthe plug 13, thereby im
the tool and applying said motion to said work
carrier drive elements, and a motion-altering
mechanism interposed between said drive ele
ments and said involute motion generating means
for modifying the involute motion applied to said
work carrier to compensate for elastic deforma
tion of the gear under heavy load in service.
parting additional rotation to the bolt [6 which
rotation alters the normal rolling motion so as to
2. In a gear grinding machine for producing
the tooth-pro?le on the work by means of rela
result in a form of the tooth pro?les ground by
the grinding disc 29 modi?ed from the true. in
tive rolling motion between the work and the
grinding tool, a rotatable grinding tool, a work
roller 24 and thus the diverting member 23 to
gether with it has diverting movements imparted
thereto at certain points of the rolling path of
the work 5. By this means the eccentrically
mounted shaft 14 effects small turning move
carrier, work carrier drive elements, means for
generating a normal involutemotion relative to
the tool and applying said motion to said work
illustrates a modi?ed form representing an aver 15 carrier drive elements, a motion-altering mech
age of alteration. Fig. 6 illustrates a modi?ed v
anism interposed between said drive elements and
form of less alteration but extending up to the
said involute motion generating means for mod
pitch circle, whereas Fig. 9 illustrates a short but
ifying the involute motion applied to said work
volute.
'
In Figs. 7, 8 and 9 three tooth-pro?les'of mod
i?ed form of the tooth face are shown. Fig.‘ 7
' intense ?attening of the tooth face.
These var
ious forms of modi?ed pro?le are effected by ac
20
cordingly shaping and positioning the two cam
carrier to compensate for elastic deformation of
the gear under ‘heavy load in service, said motion
altering mechanism including a removable and
pieces 26. To this end thesegment 25 can‘be
replaceable cam, and means for adjusting said
displaced relative to the holder 28 by turning the
cam, the conformation of the cam conforming to
ring 21, whilst the cam pieces 26 can be ?rmly
the variable requirements depending on the de
screwed to the segment 25 in different positions. 25 formation of the gear in use.
Furthermore, the cam pieces 26 can be exchanged
3. In a gear grinding machine for producing
for other such pieces with greater or smaller di
the tooth-pro?le on the work by means of rela
verting curvature by which means in the end any
tive rolling motion between the work and the
desired pro?le modi?cation of the kind shown in
grinding tool, a rotatable grinding tool, a work
Figs 7 to 9 can'be obtained.
30 carrier, work carrier drive elements, means for
A further embodiment of the invention is
generating a normal involute motion relative to
shown in Figs. 10 and 11. In this arrangement
the tool and applying said motion to said work
the effecting of the modifying movement in ad
carrier drive elements, said involute generating
dition to the rolling movement is carried out di
means including a dividing device having a divid
rectly in conjunction with the operation of the
ing disc, a motion-altering mechanism interposed
rolling elements by relative rotation of the shaft’
in said drive elements and said involute motion
6 to the rolling are on which shaft the said are is
generating means for modifying the involute mo
loosely mounted. For this purpose a sleeve 30
tion applied to said Work carrier to compensate
is keyed to the shaft 6. In the rolling are ‘I a
for elastic deformation of the gear under heavy
pin 3| is arranged about which swings a lever 32 40 load‘ in service, a removable and exchangeable
constituting the diverting member. This lever
cam included in said motion-altering mecha
carries at one end a bolt 33 which engages into
nism, and means for adjusting the cam to adjust
an arm 34 on the sleeve 3i! and at the other end
the'alteration from the involute in accordance
a guide roller 35 which, also in this arrangement,
with the deformation expected in the gear in use.
slides in the course of the rolling movement along 45
4. In a gear grinding machine for producing
camepieces 36 so as to be displaced by the divert
the tooth-pro?le on the work by means of rela
ing curvatures of said pieces. The movement of
tive rolling motion between the work and the
the bolt 33, that is, the sleeve 30 resultsin the
grinding tool, a rotatable carrier for said work,
desired additional movement of the work 5 to the
elements including a rolling are for effecting nor
normal rolling movement. A spring 31 holds the 50 mal involute generating rolling motion on each
guide roller 35 continually into bearing engage
other along a stretch of travel in accordance with
ment with the cam pieces 36. The latter are con
the length of pro?le to be ground and imparting
nected to the slide 3 directly as shown in Figs. 10
said motion to said-rotatable work carrier, a roll
and’v 11. Alternatively, said pieces may be
ing motion diverting device intercalatedbetween
threadedly connected with'a ring in adjustable 55 said work carrier and said elements for temporar- '
manner which is rotatably mounted in a holder
ily modifying said normal rolling motion, a divid
which is secured to the slide 3.
ing device being carried by a machine shaft, and
I claim:
_
a diverting member associated'with said diverting
1. Ina gear grinding machine for producing
device and mounted on said rolling are for trans-'
the tooth-pro?le on the work by means of rela
mitting the modifying movements of said divert
tive rolling motion between the work and the
ing device to said Work carrier, thereby corre
grinding tool, a rotatable grinding tool, a work
spondingly altering said normal rolling motion of
carrier, work carrier drive elements, means for
generating a normal involute motion relative to 65
said carrier.
WILLI
I
GRAF.
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