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Патент USA US2412144

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Dec. 3, .1946."
2,412,144
'c. J. GREEN‘ '
CAM ‘GRINDING MACHINE
Filed July 16, 1945
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CLARENCE.‘
.J. GREEN
Dec. 3, 1946.
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c. J.~GREEN
CAM GRINDING MACHINE
Filed July 16; 1945
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Dec-3,1946
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c. J. GREEN
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CAM GRINDINGYMACIHINE
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2,412,144
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Filed July 16, 1945
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MASTER’ CAM HELLER?
MASTER‘ CAM
60"
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CLARENCE ‘.J. GREEN
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Patented Dec. 3, 1946
2,412,144
UNITED STATES PATENT OFFICE
2,412,144
CAM GRINDING MACHINE
Clarence J. Green, Worcester, Mass., assignor to
Norton Company, Worcester, Mass., a corpora
tron of Massachusetts
Application July 16, 1945, Serial No. 605,339
5 Claims. (01. 51-101)
1
.
The invention relates to grinding machines, ‘
and more particularly to a machine for grinding
2
anism has been illustrated comprising a manu
ally operable rotatable traverse wheel I~5 which
is operatively connected to rotate a gear IS. ‘The
gear I5 is mounted on a rotatable shaft I1 which
li e.
'
is journalled in suitable bearings (not shown) in
One object of the invention is to provide a sim
the base III. The shaft I‘! also supports a gear
ple and thoroughly practical cam grinding appa
I8 which meshes with a rack bar I3 depending
ratus for grinding cam shapes, such as automo
from the under side of the table I I.
tive cams or elliptical shapes for automotive pis
A rotatable grinding wheel 20 is supported on
tons and the like. Another object of the inven
tion is to provide a grinding apparatus in which 10 a rotatable wheel spindle (not shown) which is
mounted in suitable hearings in a wheel slide 2|.
the shape of the cam or piston being ground may
The wheel slide 2| is arranged to slide trans
be varied relative to the shape of the master cam.
versely relative to the base I0 on a V-way 22 and
Another object of the invention is to provide
ya ?at. way 23 formed on the base III. The grind
means whereby the shape of the work piece be
ing ground may be varied so as to compensate 15 ing wheel 20 is preferably rotated by an electric
motor 24 which is mounted on the Wheel slide
for differences in diameter of the grinding wheel
2|. The motor 24 is provided with an armature
caused by wheel wear or truing. Other objects
shaft ‘25 which supports a multi-V-groove pulley
will be in part obvious or in part pointed out
ailitomotive cams, oval-shaped pistons and the
26. The multi-V-groove pulley '26 is connected
.
The invention accordingly consists in the fea 20 by multiple V-belts 21 with a multi-V-groove pul
ley 28 which is mounted on the right-hand end
tures of construction, combinations of elements,
of the wheel spindle (Fig. l). .
and arrangements of parts, as will be exempli?ed
A suitable wheel feeding mechanism is provided
in the structure to be hereinafter described, and
for feeding the grinding wheel 20 and the wheel
the scope of the application of which will be in
25 slide 2| transversely to position the wheel 20 rela
dicated in the following claims.
tive to a work piece being ground and to feed the
In the accompanying drawings in which is
hereinafter.
shown one possible embodiment of the mechanical
features of this invention,
Fig. 1 is a fragmentary front elevation of the
improved grinding machine;
Fig. 2 is a fragmentary cross-sectional view,
on an enlarged scale, taken approximately on the
line 2-2 of Fig. 1;
V
Fig. 3 is a staggered sectional view, taken ap
proximately on the line 3-3-3 of ‘Fig. 2, showing
' the relationship of the master cam and follower
roller and the supporting parts therefor;
,Fig. 4 is a fragmentary sectional view, taken
approximately on the line 4-4 of Fig. 3; and
Fig. 5 is a diagrammatic view, showing the
arrangement 'of the master cam and follower
roller and the adjustably mounted connecting link
between the supports for the master cam and the
wheel 20 into the work to grind it to the desired
and predetermined size. ‘This wheel feeding
mechanism has not been illustrated in detail since
it is not considered to be a part of the present in
vention. The wheel feeding mechanism is sub
stantially the same as that which is old and well
known in the grinding art such as, for example,
that shown in the prior U. S. patent to Norton,
No. 762,838, dated June 14, 1904, to which refer
ence may be had for details of disclosure not
contained herein. The wheel feeding mecha
nism may comprisev a manually operable rotat
able feed wheel 29 which is provided with the
usual micrometer feed adjusting mechanism 30.
The feed wheel 29 is operatively connected
through a gear mechanism (not shown) to ro
tate a gear 3I which is‘mounted on the outer end
of a rotatable feed screw 32. The feed'screw 32
follower roller.
'
A grinding machine has ‘been illustratedin the 45 is arranged to mesh with a half nut 33 depending
from the under side of the Wheel slide 2|.
drawings comprising a base I0 which serves as
The work supporting table II serves as a sup
a support for a longitudinally movable work sup
port, for a work rotating and driving mechanism
porting .‘table II. The table ‘II is slidably sup
comprising a rock bar 35 which is mounted to
porte‘diona'V-way I2 and .a flat way I3.‘
'The work table I I maybe moved longitudinally 50 rock upon trunnion studs 36 and 31 which are
journalled in brackets 3-8 and v39. The brackets
[to ‘position ‘it relative to the base I0 either by a
38 and 139 are ?xedly mounted on the work sup
.power operated mechanism such as is old and
porting table I I,
well known in the art or by means of a manually
A rotatably mounted headstock spindle 4,0 is
operable traverse mechanism. .Asillustrated in
‘the drawings, a ‘manually operable traverse mech 55 provided with a work holding ?xture M to sup
2,412,144
,3
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port one end of a work piece 42. The other end
of the work piece 42 is supported by a footstock 4
center‘ 43 carried by a footstock 44. The foot
stock 44 is adjustably mounted on the rock bar 35.
The headstock spindle 40 is rotatably sup
ported in a manner to be hereinafter described
and is surrounded, by meansof a housing 45
which is'?Xed relative to the table '-| I‘. An elec
tric motor 45 is provided for rotating the head-.
stock spindle 40. The motor 46 is provided with’
A. suitable mechanismis provided for main
taining the ;.master cam '58- ‘in operative ‘engage
ment with the master cam roller 60 during a
This mechanism may com
.10 grinding operation.
prise a tension spring 80 which is connected at
onev end by means of a stud 8| with the housing
an armature shaft 41 which supports a multi-V
groove pulley 48. The multi-V-groove pulley 48
is connected by multiple V-belts 49 with a multi
45. The other ,endof the spring 89 is connected
V-groove pulley 50. The multi-V-groove pulley ,
58 is supported on a shaft 5| journalled' in
II.
The shaft 5! is
connected by means of a universal joint 53 and
83 supported adjacent to the upper end of an
vided with an adjusting nut 86 by means of which
a telescopic shaft 54 with a universal joint
55 which is operatively, connected to the
by a stud 82. , The stud 82 is conneced by a stud
arm 84 which is ?xedly supported relative. to the
rock bar 35. The stud 8| is preferably provided
with a screw threaded portion 85 which is pro
a suitable bearing bracket 52 which is ?xedly
mounted on the table
4
The pivot stud ‘H is slidably supported in an
elongated slot ‘Ha (Fig. 3) to facilitate adjust
ment thereof. Similarly, the pivot stud ‘I2 is
supported within an elongated slot 12a. (Fig. 4)
to facilitate adjustment of the Stud 12 relative to
the rock bar 35.
20’
left-hand end of the headstock‘ spindle 40. The
headstock spindle 40 is rotatably supported in
the tension of the spring‘ 80 may bev varied as. de
sired.
,
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In the diagrammatic view (Fig. v5), a: master
bearings 56 and 51 which are fixedly mounted on
cam is shown having a long and a short axis for
the rock-bar 35.
producing an oval orelliptical shape on a: work
piece such as a piston, the shape in the draw
‘
r
1
‘
In order to transmit a controlled rocking
movement tothe rock bar 35 to generate _a pre
determined shape on the work piece 42, a master
cam 58 is supported on the headstock, spindle 40.
A master cam roller 60 is mounted on a rotat
able shaft 61 which is in turnv carried by a piv 30
ing being somewhat exaggerated.diagrammati-v
cally to illustrate the operation. Dueto the‘ are
rangement of the pivotal axis for?the rock bar 35
and the frame 62, thepivotlpin 12 at the right
hand end of the link 10 is‘arrangedlso'that it
otally mounted frame 62. VThe'frame 62is sup
may be adjusted in'a path'normal'to the axis of
ported by a pivot shaft 63 which is carried by a
the rocking of the rock bar 35. Duev to the'link
bracket 64 mounted in ?xed relationship with
age arrangement, the stud 12‘ may be adjusted
the housing 45. The follower roller 60 is ,ar
ranged operatively to engage the master cam
roller 58 so that when the master cam 58 is ro
tated, a controlled rocking motion. will be im
parted to the rock bar 35 so as to rock the work
either toward or from the axis of the spindle?“
:piece 42 beinggroundtowardand from the pe
thereto, namely c—d, may be varied by adjust
ment of the pivot'stud 12. If it is‘ desired vto
riphery of the grinding wheel to generate‘ a pre
determined shape on the work piece.
In grinding automotive cams and pistons of an
oval cross-sectional area, themastercam is ac
curately generated to operate ‘with a grinding
wheel of a predetermined diameter. -As the
grinding wheel wears away due to grinding and
also truing the same, the contour of the cam
or piston being ground changes slightly as the
wheel diameter is reduced. In production grind
so as to vary the shape generated on the periph.-_
ery of the work piece 42 in such a manner that
the long axis, that is, on the line :r—,y, remains
constant while the short axis at right angles
change the shape of the piston being generated
so that the short axis thereofis increased, the
pivot stud 12 maybe lowered into position 121), ‘in
which case the camv ‘bein‘g'ground will have a
short axis, as indicated by the fragmentary
broken line b. If it is "desired to decrease‘ the
short axis of the piston being generated, the piv
ot stud 12 may be raised to position 120,, in which 7
case the short axis of the work being‘ground will
ing, therefore, it is .common practice to use a ‘
rbe decreased, as indicated by the broken line 1.
wheel'of a given initial diameter and, when the
During each of these adjustments, due to there
lationship of the pivotal supportsfor the rock
bar 35, the frame 62 and the link connection. ‘III,
wheel wears away so thatits diameter'is re
duced a predetermined amount, to remove the
wheel and replace it with a new one in order that
the cam or piston contour may be maintained
substantially constant. This practice means that
only a small portion of a grinding wheel may be
used on a given cam grinding operation, after
which it must be discarded and replaced with a
I
i
It is, therefore, desirable'to pro
vide suitable adjustments whereby when the
grinding wheel Wears away, the rocking move
ment of the rock bar may be varied so as to com
pensate for reduction in diameter of the grind
ing wheel.
~ ~
In order to facilitate adjusting the motion of
the rock bar 35 relative to the master cam roller
the long axis :v—y will remain substantiallycon
stant. The angular. swinging, movement of the I
frame 62 is, preferably, less than the angular
swinging movement ‘of the rockbarz35to facili
tate maintaining the master cam 58‘ in operative
Contact with the master cam roller 50. ' The ten
sion of the spring 80 (Fig. 2)‘ serves to rock the
rock bar 35 so as to maintain the master cam 58 in
operative engagement with the master cam roller
10'. It will, therefore, be seen that by a precise
adjustmentv of the pivotrstud 12, the shape of
the piston-being generatedmay be variedjsoas
to compensate for reductionin diameter ‘of ‘the
grinding wheel due to wheel ‘wear or tming so
that the shape of the piston being groundmay
60, a connecting link 10 is provided which is
connected between an adjustably mounted piv
ot stud l2 supported by the rock bar 35 and an
be maintained substantially constantin'shape. "
adjustably mounted pivot stud 1| supported by
stud 1| so that it may be adjusted iria path sub- '
the frame 62.
stantially normal to the axispf the pivot stud ‘.613
which supports the frame .62. ‘The pivot vstud
,‘Il may be raised into position‘ ‘I la or‘ lowered into
position ‘Hb to facilitate further adjustment to
Adjusting screws 13 and 14 are
provided for respectively adjusting the position
of the pivot studs ‘II and 12 relative to the frame
62 and the rock bar 35, respectively,
A similar adjustment is provided'for'thej'pivot
2,412,144
5
alter the shape of the cam being produced rela
tive to the master cam, similarly to aid in com
pensating for the reduction in diameter of the
grinding wheel due to wheel wear or tru-ing.
The operation of this improved ‘cam grinding
apparatus will be readily apparent from the fore
going disclosure. A cam or ‘piston 42 to be ground
is placed in position on the work supporting ?x
ture 4| while the other end of the piston is sup
6
to engage said master cam, a pivotally mounted
frame to support said roller, yieldable means to
maintain said master cam in operative engage
ment with said roller, a connecting link, pivotal
connections between the ends of said link and the
rock bar and the frame respectively, and means to
adjust the pivotal connections between the rock
bar and the link in a direction normal to the piv
otal axis of said rock bar whereby the contour
ported by the footstock center 43. The grinding 10 of the cam being ground may be varied relative
to the shape of the master cam.
operation may then be started by starting the
3. In a cam grinding apparatus having a rotat
motors 24 and 46 and the grinding wheel 20 is
able grinding wheel, a pivotally mounted rock bar,
fed into grinding engagement with the periphery
a rotatable work support on said rock bar to sup
of the piston 42 while the master cam 58 rotates
port a cam to be ground, a rotatable master ‘cam
in operative engagement with the master cam
on said rock bar in axial alignment with the cam
follower roller 60 so that a cam face or oval shape
to be ground, a rotatable follower roller arranged
may be ground to the predetermined size and con
to engage said master cam, a pivotally mounted
tour. As the grinding operation proceeds and
frame to support said roller, yieldable means to
the wheel 20 wears away, or is trued away during
truing operations, to a point where the contour 20 maintain said master cam in operative engage
ment with said roller, a connecting link, pivotal
of the work piece being ground changes beyond
connections between the ends of said link and
limits, instead of replacing the grinding wheel
the rock bar and the frame respectively, and
with a new wheel the operator may adjust the
means to adjust the pivotal connections between
position of the pivot studs 12 and/or ‘H in either
an upward or downward direction in a path nor
mal to the axis of the rock bar 35 or the axis of
N Cl the ‘frame and the link in a direction normal to
the pivotal axis of said rock bar whereby the
contour of the cam being ground may be varied
relative to the shape of the master cam.
4. In a cam grinding apparatus having a ro
relative to the shape of the master cam so that 30 tatable grinding wheel, a pivotally mounted rock
bar, a rotatable work support on said rock bar to
the contour on the ?nished work piece may be
support a cam to be ground, a rotatable master
maintained within predetermined limits.
cam on said rock bar in axial alignment with the
It will thus be seen that there has been pro
cam to be ground, a. rotatable follower roller ar
vided by this invention apparatus in which the
ranged to engage said master cam, a pivotally
various objects hereinabove set forth together
mounted frame to support said roller, a connect
with many thoroughly practical advantages are
the frame 62, as desired, to compensate for the
reduction in diameter of the grinding wheel so
that the cam face being produced will be changed
successfully achieved. As many possible embodi
ing link .pivotally connected at its ends at said
rock bar and said frame respectively, and means
to adjust the pivotal connections at both ends
above set forth, it is to be understood that all it) of said link relative to said rock bar and said
frame in a direction normal to the pivotal axis
matter hereinbefore Set forth or shown in the ac
of the rock bar and frame respectively to facili~
companying drawings is to be interpreted as illus
tate varying the shape of the cam being ground
trative and not in a limiting sense.
relative to the shape of the master cam, thereby
I claim:
compensating for reduction in wheel diameter due
1. In a cam grinding machine having a ‘rotat
to wheel wear.
able grinding wheel, a pivotally mounted rock bar,
5, In a cam grinding apparatus having a rotat
a rotatable work support on said rock bar to sup
able grinding wheel, a pivotally mounted rock
port a cam to be ground, a rotatable master cam
bar, a rotatable work support thereon .to support
on said rock bar in axial alignment with the cam
to be ground, a rotatable follower roller arranged 50 a cam to be ground, a master cam thereon in axial
alignment with said cam, the pivot of said rock
to engage the master cam, a pivotally mounted
bar being located below the axis of the cam and
frame to support said roller, yieldable means to
maintain said master cam in operative engage
master cam, a rotatable master cam follower roll
er, a pivotally mounted frame for supporting said
ment with said roller, and a connecting link the
ends of which are pivotally connected to said rock 55 roller, the pivot of said frame being located above
bar and said frame, respectively.
the axis of said master team roller, a connecting
2. In a cam grinding apparatus having a rotat
link between said rock bar and said frame, and
ments may be made of the above invention and as
many changes might be made in the embodiment
able grinding wheel, a pivotally mounted rock bar,
adjustable pivotal connections between opposite
a rotatable work support on said rock bar to sup
ends-of said link and the rock bar and frame
port a cam to be ground, a rotatable master cam 60 respectively.
on said rock bar in axial alignment with the cam
CLARENCE J. GREEN.
to be ground, a rotatable follower roller arranged
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