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Патент USA US2406817

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SePt- 3, 1946»
Filed June 2, 1944
[3:3] -
1/22 '70
Her-Earl’ hf
i\ v
‘ ‘
Patented Sept. 3, 1946
Herbert H. Engemann, Cleveland Heights, Ohio
Application June 2, 1944, Serial No. 538,455
8 Claims.
(Cl. v123-—~90)
' 2
This invention relates to automatically extensi
trol is accomplished by curving the slots of the
ble and contractable links for providing a con
hammer in which rides a ?oating pin. The
?oating pin cannot bind or otherwise interfere
stant predetermined adjustment in the valve-op
erating linkage of an internal combustion‘engine.
Speci?cally the invention relates to the inertia
hammer and pin arrangement of automatic push
with‘ free actuation of the assembly.
It is, then, an object of this invention to pro
vide automatically extensible and contractable
devices wherein contraction is obtained by action
of an inertia sleeve or hammer on a ?oating pin.
According to this invention an automatically
extensible and contractable rod or link is incor
A still further object of the invention is to pro
porated in the operating mechanism between the l (I) vide an inertia hammer and ‘pin assembly for
automatic push rods which imparts an e?icient
rotative blow only after the valve actuated by
the push rod is completely closed.
Another object of the invention is to provide
cam shaft and poppet valve of an internal com
bustion engine to maintain a desired amount of
operating clearance in the assembly irrespective
of temperature variations in the engine and Wear
of parts which change clearance relationships
in such assemblies. The push rods or links of
an inertia sleeve or hammer for automatic push
rods with a slot arrangement which drives an
impact blow in a rotary direction only on the
downstroke of the rod.
A still further object of the invention is to pro
vide a slot arrangement for inertia hammers
of push rods'which relieves oil to insure a full
this invention include threaded-together male
and female parts with a torsion spring acting
to rotate the parts in one direction for length
ening the assembly together with an inertia ham
mer effective to rotate the parts in the reverse ‘
direction for shortening the assembly.
During the upstroke, or ‘valve-opening stroke
of‘ the push rods of this invention, the rods are
under compression load and act as rigid mem
bers for transmitting movement.‘ Duringthis up
stroke the push rod is decelerated at about half
open valve position and inertia causes a telescop
impact force.
way interfere with free operation of the assembly, ‘
Other‘and further objects of theinvention will
be apparent to those‘skllled in the art from the
following ‘detailed description of the annexed
sheet of drawings which, by way of preferred ex
ample only, illustrate two embodiments of the
ing sleeve or inertia hammer to fly upwardly on ,
the rod. On the downstroke, the rod is decel
erated at about half closed valve position and
the inertia hammer ?ies downwardly to hit a 1'0
tative impact blow on a pin carried in onevof
the threaded parts for rotating this part in one
direction against the bias of the torsion spring
to shorten the length of the rod. Immediately
after the hammer energy is spent, the torsion
spring unwinds and rotates the part in the re
verse direction to lengthen the rod and take all
undesired play out of the linkage. This is done
before the next valve opening cycle.
A still ‘further object of the invention is to pro-i
vide a ?oating pin assembly for automatic push
rods which cannot bind, work loose, or in any
On the drawing:
Figure‘ 1 is a fragmentary broken side eleva
tional view, with parts in vertical cross section,
of a push rod assembly according to this inven
Figure 2 is an enlarged fragmentary broken
In order to permit the valve‘to be seated when
the rod has been elongated to compensate for
vertical cross-sectional view of parts of the push
rod of Figure 1, taken along the line II-II of
Figure 3.
Figure 3 is an enlarged side elevational view of
the lower portion of the push rod of Figures 1
heat expansion of the engine and when the en
gine has then been stopped and ‘cooleddown, a
and 2.
view of another form of push rod or automatic
valve-operating ‘ clearance
Figure 4 is
enlarged vertical cross-sectional
tappet according to this invention.
rangement is provided. This spring-pressed ar
Figure is a fragmentary cross-sectional view
taken along the line V—V of Figure 4.
As shown on the drawing:
can remain closed even though the rod is actually 50
rangement is weaker than the valve spring but
stronger than the torsion spring solthat the valve
too long to permit this closure.
“In Figure 1 thereference numeral l0 desig
nates generally an engine body having a bore II
therein in which is slid-ably seated a hollow cam
vfollower l2 having. a bottom wall [2a acted upon
by a cam 13 of a cam shaft H. The side wall l2b
of the‘ cam follower rides in the bore _H of the
engine body and has an aperture l5 therein
adapted to be aligned with an oil supply duct It
Di?icultv has been experienced in‘ devices of
the type referred to because of unauthorized driv
ing rotation imparted by the inertia hammer, on
the upstroke of the rod when the rod should act
as a rigid member. According to this invention
such driving rotation on the upstroke is either
entirely eliminated or reduced to a negligible
amount by controlling the impact angles of the
hammer relative to the impact pin. Such con
in the engine body.
A cup I‘! is seated in the open top end of the
cam follower l2 and has a shoulder Ha bottomed
on top of the cam follower. The ball cup H has
an aperture llb in the bottom thereof adapted
to receive oil from the interior of the cam fol
ated and the inertia hammer or sleeve 217. ?ies up
wardly to receive the pin 22 in the bottoms 23a of
its slots 23 (Fig. 3). As shown in Figure 3, the slot
23 is arranged so that upward movement of the
lower l2. A fragmental ball seat lie" is provided C71 sleeve 24 on the pin 22 will not cause any rota
in the ball cup H.
tive throw to be delivered on the pin since the
A push rod 88 has a bottom stud IS with a
bottom portion of the slot 23 is vertical. How
segmental ball end l9a rockably and rotatably
ever, the slot curves from a vertical bottom 23a
mounted on the ball seat Il'c of the cup ii.
to an inclined top 23b.
The push rod it has an elongated internally 10
When the cam l3 allows the cam follower £2
threaded nut 28 mounted in the lower end of a
to drop, the push rod is accelerated on its down
tube 2! and having a shoulder 29a thrusting on
stroke to about half closed valve position and is
the bottom end of the tube 2i. The stud l9, as
then decelerated as the cam contour slows up the
shown in Figures 1 and 2, has an enlarged cylin
rod to a stop at fully closed valve position. How
drical portion i517 spaced beneath the nut 20 and
ever the hammer 24 is free to ?y downwardly
tube 21, together with a threaded shank portion
580 which is threaded into the nut 20.
at the maximum downward- speed attained by the
rod before deceleration by the cam. This down
The stud It has an axial bore I9d therethrough
ward movement of the sleeve 24 is accompanied
by a rotative movement of the sleeve caused by
the curved slots 23 and when the inclined tops
23b of the slots impact the pin, they deliver a
rotative blow to this pin. Since the pin is seated
in the stud t9 rotation of the pin will rotate the
stud. The slots 23 are curved in such a direction
that this rotative action on the stud will be in
a direction to thread the Stud [9 into the nut
together with a transverse bore We in the en
larged portion {92) thereof intersecting the bore
A pin 22 is passed through the transverse bore
Me. This pin hasa free ?t in the bore 19c.
The ends of the pin project into" the slots 23,
23 of an impact hammer or sleeve 24 which is
slidably mounted on the lower portion of the
tube ‘2! and on the cylindrical portion E911 of the
20,>thereby shortening the e?ective length of the
rod and. winding up'the torsion spring 30. Imme
The pin 22 has an annular groove 2320. around
diately after the hammer energy is spent in this
the central portion thereof disposed in the bore 30 way the torsion spring has ample time to unwind
Esd. A hollow plunger 25 is seated in the bore
thereby reversely rotating the stud l9 and length
Mid and bottomed in the groove 22a. A spring
ending the rod 18 before the next valve opening
26 in the bore ltd acts on the plunger 25 to
urge it into the groove 22a.
The torsion spring 30 thus automatically re
The top portion of the bore "id is internally , moves any undesi-rable play in the valve linkage
threaded and receives, in threaded relation there
but the spring is too weak to compress the spring
in, a bushing 2?. The bushing 2'! acts on the top .
of the spring 26 to hold the same under com
which maintains the operating clearance space
C between shoulder 31b and the top end of the
pression. The bushing 27 has a head 21a bot
rod 2! which spring. is shown in the above men~
tomed on top of the shank portion I90 of the 40 tioned copending application. However should
stud IS.
the spacing C become less than the intended op
A rod 28 is anchored in the bushing 2? and
erating clearance, due to thermal changes in the
projects upwardly therefrom through the cen
engine, then the inertia hammer 2t becomes
tral portion- of the tube 21. The upper end of
effective to shorten the push rod until the desired
the rod 28 carries a spring anchor 29 also en
clearance space C is- re-established.
cased by the tube 2|. A torsion spring 30 (Fig.
Oil to. lubricate the rod assembly can be fed
1) is anchored at one end 30a. thereof to the
from the oil. duct. [5 through the aperture $5 in
nut 28 and at the other end 30b thereof to the
the cam follower I 2 and thence through the open.
anchor 29. The torsion spring acts to reversely
ing Hb in the ball cupv ll into the axial bore Hid
rotate the stud l9 and nut 20 in an unscrewing
direction to elongate the stud and nut assembly.
The upper end of the rod 2|, as shown in Fig
ure 1, carries a stud 3| having a ball end 3m,
seated in a ball cup 32 carried by the rocker
arm 33 of the valve linkage. The stud may be
spring-pressed as is described in my copending
application S. N. 538,454.
An operating clearance space C is provided
between a shoulder 3 lb of the stud 3i and the top
of the rod. The arrangement as described in- the
above mentioned copending application is such
that this clearance space C can be adjusted to
provide any desired gap and, on the upstroke of
the rod !8, the spring holding the poppet valve
(not shown) in closed position is stronger than
the spring acting on the stud 3! so that the space
C will be taken up before the push rod is effec
tive to rock the arm 33.
On the valve-opening stroke, or upstroke of
the assembly, the cam iii of the cam shaft Ili
raises the cam follower :2 which cam follower, in
turn, raises the push rod I8 to take up the clear
of the stud 19.
One. or more radial oil holes 34
(Fig. 2) are provided. in the threaded portion lilo
of'the stud to supply oil from the bore Hid to
grooves such as 35 in the threaded exterior of
the stud. These grooves distribute oil to the
threads and to grooves 36 which are open at
the bottom ends 36a thereof above the enlarged
portion 19b of the stud l9. Oil_can thus drain
through the grooves 36 for lubricating the bear
ing surfaces for the sleeve 24, via, the tube 2|
and enlarged portion |9b of the stud [9.
In order to- prevent oil from being trapped be~
tween the pin 22 and the upper ends 232) of the
slots 23, the upper ends of the slots are relieved
as at 230 (Fig. 3) on each side of the pin 22
so that any oil between the pin. and the slot wall
23b can be readily forced into: the relieved por
tions 23c thereby permitting the full impact blow
of the sleeve on the pin.
Since the pin 22 has a free fit in the bore We
of the. stud [9. expansion and contraction of the
bore due to varying temperatures of the assembly
will not a?ect the» pin because the pin is ?oating
ance space C and then cause the stud 3| to
in the bore. At the same time, however, the pin
rock the arm 33. During about the last half
is held against endwise movement so that its
portion of the upstroke the push rod is deceler 75 ends will always extend into the slots 23 cf the
‘sleeve '24 by the spring-pressed‘ plunger '25 act;
provided between the member 53 and the top
ing in the groove 22a of the‘ pin.
A press ?t of the pin in the stud I9 is not sat
isfactory because the vibratory action to which
the assembly is subjected causes press ?ts to
loosen and permits a pin to move endwise. The
of the stud.‘ This operating clearance C' pro
vides a safety arrangement under conditions
where due to sudden thermal changes and espe
cially at low engine speeds the impact hammer
is unable to shorten the effective length of the
?oating pin is always held in its proper centered
valve linkage fast enough to keep up with the
thermal. changes. Under this condition, the pre~
temperature changes.
set clearance C’ will be slightly diminished for
In the embodiment shown in Figures 4 and 5, 10 a short period, until the impact hammer, by
a push rod or tappet 40 has a hollow cylindrical
means of rotative impacts on pin‘49, has'screwed
housing 4| with a bottom wall 4|a adapted to
stud 43 into nut 42 in a shortening direction suf
ficiently until the pre-set clearance at C’ is re
be acted on by a cam of a cam shaft (not shown)
established. Through this operating clearance
and with a side wall 4| b adapted to slide in the
bore of an engine body member (not shown). 15 vC’, therefore, the valve is permitted to seat prop
erly at all times.
The side wall has an aperture 4|c therein to re
position and is not affected by vibration or by
ceive, lubricant from the engine body in the
manner shown in Figure l.
The assembly 40 operates the‘same as the as
sembly I8, and can be used in installations not
involving rocker arms, since the member 53 can
The open top of the housing 4| receives a nut
42 with a head 42a bottomed on top of the hous
ing. A stud 43 is threaded through the nut 42
and the stud and nut are provided with con~
ventional threads such as V-threads. The lower
end of the threaded portion of the stud 43. has
several turns of truncated threads 44a thereon.
act directly on a valve stem or a member seated
on the valve stem.
From the above descriptions it will be under
stood that the invention now provides a slot
and. pin arrangement for automatic push rods
which translates inertia forces of a sliding sleeve
in a vibratory linkage into rotative movements
These threads have fiat tops and cooperatewith
the adjacent V-threads of the stud 43 to pro
for resisting a torsion spring to foreshorten ‘a
link or push rod.
It will, of course, be understood that various
details of construction may be varied through
a wide range without departing from the prin
vide a shoulder or stop 45. A spring anchor 46
is threaded on the truncated threads 440. against
the stop 45.
A torsion spring 41 is anchored at one end 4m
to the nut 42 and at the other end 411) to the
anchor 46. This torsion spring is effective to
ciples of this invention and it is, therefore, not
rotate the anchor 45 tightly against the shoulder
the purpose to limit the patent granted hereon
otherwise than necessitated by the scope of the
45 of the stud and then rotate the stud 43 in 1
appended claims.
the nut 42 until the anchor 46 abuts the nut
42 as shown in Figure 4. In operating position,
I claim as my invention:
1. An extensible and contractable link mem
the tappet assembly as shown in Figure 4 is so
installed in the valve linkage that there is a
slight spacing between nut 42 and anchor 46.
ber comprising threaded~together male and
female members, a torsion spring reversely rotat
ing said members for lengthening the link, an
inertia hammer freely slidable on said link hav
Thus, the torsion spring 41, like the spring 30
in the modi?cation of Figure 1, tends to lengthen
the assembly by rotating the stud in a direction to
screw it outwardly from housing 4|.
The lower end of the stud 43 projects beyond
the anchor 46 and has diametrically opposed
transverse circular holes 48 therethrough receiv
ing a pin 49 freely therein. The pin49 projects
through the slots 50a, 50a of an inertia hammer
50, and the ends of the pin are adapted to ride 50
on the cylindrical inner wall 4|c of the housing
4|. The hammer sleeve 5|] has outwardly pressed
bead portions 501) at the top and bottom thereof
for sliding on the cylindrical inner wall Me
of the housing 4|.
The slots 50a of the sleeves 50 are similar to
the slots 23 of the sleeve 24 and have bottom ends
extending in vertical directions and top ends
extending in inclined directions together with
relieved portions 50c on each side of the pin
49 to receive oil and. prevent an oil trap.
The vibratory action of the sleeve 50 is such
that on the downstroke of the assembly it will
deliver a rotative blow to the pin 49 rotating the
stud 43 against the action of the torsion spring
to foreshorten the assembly. The torsion spring
ing diametrically opposed slots with substantially
vertical ?rst ends and inclined second ends, a
pin freely carried by one of said threaded-to
gether members projecting into said slots, and
means holding said pin‘ in assembled relation
whereby movement of the sleeve in one direction
will impart an axial impact on the pin while
movement of the sleeve in the reverse direction
will cause a rotative impact on the pin resisting
said torsion spring to thread the male and female
members together for shortening the link.
2. An extensible and contractabl'e link assem
bly comprising threaded-together male and
55 female parts, spring means acting on said parts
lengthens the assembly by screwing the stud in
an outward direction from the nut.
A cap 52 is threaded on the upper end of the
stud 43 and slidably supports a valve-actuating
seat 53. A look nut 54 is provided under the cap
52. The support 53 is spring-pressed by means
of a coil spring 55 held under compression between
the pin 49 and the seat 53 and extending through
the hollow stud 43. An operating clearance C’ is 75
to lengthen the assembly, an inertia hammer
movable relative to said assembly, a pin loosely
mounted in said one part, said hammer having a
slot engageable by said pin, resilient means for
positioning said pin in engagement with said
slot, said slot having one end substantially par
allel to the path of movement of said hammer
and another end inclined to the path of move
ment of said hammer, whereby relative rotation
of said male and female parts to shorten the as
sembly is produced by only one direction of move
ment of said hammer.
3. In a vibratory mechanical linkage, a link
member having threaded-together parts, a tor
sion spring rotating the parts for lengthening the
link member, a pin loosely mounted in by one of
the parts, means holding the pin against end
wise movement, and inertia weight movable rela
tive to said link member and having slots receiv
ing the ends of the pin, said slot being constructed
and arrangedto impart a longitudinal blow. on
thetpih during one. stroke of the linkage and a
rotativeiblowi on the opposite stroke of the link
having diametrically opposed slots receiving the
ends of said pin, said slots having substantially
age whereby the parts will beythreaded together
vertical lower ends and inclined upper ends to
gether with relieved portions at the upper ends
by the rotative blow to shorten the link.
4. An automatic push rod including a nut, a
ho‘loww stud threaded; into said nut, a torsion
blows to the pin on one stroke of the push rod.
whereby the sleeve will impart rotative impact
'7. A push. rod assembly comprising threaded
together male and female parts, a pin passed
spring reversely rotating the stud‘ and nut to
lengthen the push rod, a pin extending freely
transversely through the male parts in free slid
through. said stud,. a spring-pressed plunger in 10 able relationship therewith, a hammer sleeve
said stud. acting on’ said pin, to hold. the same
movable relative to said parts and having slots
receiving the ends of the pin, a housing encasing
against endwise movement, and an inertia weight
having slots receiving the ends of the pin ar
said hammer sleeve and male part having interior
ranged ior delivering a rotative impact blow to
the pin on one stroke of the push rod. and. a longi
tudinal blow on the pin on the opposed stroke
of the push rod.
5.. A. pus-1i rodfor valve‘ linkages of internal
combustion. engines which comprises hollow
threaded-together male and female members, a
torsion spring for rotating said members relative
to each other to lengthen the push rod, a pin ex
tending transversely through the hollow male
member and having a centrally grooved portion,
walls for guiding the ends of the pin to hold the
same in assembled relation, said slots in said
hammer sleeve having one end thereof substan
tially parallel to- the path of movement of said
hammer and the other end thereof inclined to
the path of movement of said hammer, thereby
delivering rotative impact blows to the pin
for rotating the male member in only one direc
tion by movement of said hammer.
8. In a linkage having cooperating male and
female parts relatively rotatable to effect adjust
a- sp'ri-ng-p'resse'd plunger in the hollow male 25 ment of the length of the linkage, the improve
member seated in said grooved portion of the
ments of an inertia hammer movable relative to
pin to hold the pin against endwise movement,
said parts and having a slot therein, a pin mem
ber engageab'fe in one of said parts and project
an inertia hammer slidable on the push rod hav
ing opposed slots receiving the ends of the pin,
il'ig into said slot of said inertia hammer, at least
and. said slots being arranged with vertical lower 30 one end of said slot being constructed and ar
ends and inclined upper ends to deliver longitu
ranged to impart a rotative blow to said pin when
dinal blows to the pin on the upstroke of the push
said inertia hammer moves relative to said parts,
rod and rotative blows to the pin on the down
the engaging surface of said one end of said slot
stroke of the push rod.
having a plurality of recesses formed therein to
6. An automatic push rod assembly for valve
provide lubricant receiving pockets during im
linkages comprising threaded-together male and
pact of the said end of said slot against said pin.
female parts, a pin passed transversely through
the male part, a sleeve slidable on the push rod
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