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Патент USA US2129886

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Sept. 13. 1938.
A. J. sYRoV-Y
Filed July 5, 1935
2 shuts-sheet _1
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Sept. 13, 1938.
Filed July 5, 1935
2 Sheets-Sheet 2
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Patented Sept. 13, 1938
Augustin .l. 'Syrovy', Detroit, Mich, 'assignor to
Chrysler Corporation, Highland Park, Mich., a
corporation of Delaware
Application July 5, 1935, Serial No. 29,788
1 Claim. (Cl. Nit-4W2)
This invention relates to pumps and refers
- more particularly to improvements in pumps
bodiments of certain features of my invention
and in which:
Fig. 1 is a sectional plan view of my pump
adapted to produce and maintain pressure on a
fluid, such as oil, suitable for use in systems of assembly taken along line |-—l of Fig. 2.
Fig. 2 is a side elevational view of the pump
a motor vehicle transmission control although my
improvements are adaptable to a wide variety of assembly, with certain parts in cross section. '
Fig. 3 is a sectional view along line“3—3 of
applications. As‘illustrative of one system of
transmission control to which my pump is adapt Fig. 1.
Fig. 4 is aside elevational view of the right
able, reference is made to the co-pending appli
lil cations Serial No. 724,434 ?led May 7, 1934 and hand end of the pump viewed in Fig. 1.
Fig. 5 is a detail sectional view along line 5-5
Serial No. 752,948 ?led November 14, 1934.
One object of my invention is to provide an of Fig. 1.
Fig. 6 is a detail sectional view along line '6--6
improved pump which will e?iciently and quickly
m provide a relatively high pressure of the oil, such of Fig. 5.
Fig. 7 is a fragmentary View of a-pump rotor
pressure being maintained preferably without re- ~
quiring operation of the pump after the required - and port seating element of modi?ed form but
adapted for use in the Fig. 1 assembly.
pressure is attained.
Fig. 8 is a detail sectional view along line 8-8
Further objects of my invention are to provide
a pump having improved characteristics of ?uid
20 seal; a pump capable of long and continuous
service such as is required in motor vehicle usage,
without undue heat generation, noise, wear or
failure through other causes.
. '
Another object of my invention is to provide an
25 improved pump having relatively rotating parts
of Fig. '7.
Referring to the drawings the pump assembly
comprises a casing structure A adapted for at
tachment at openings in to a suitable support
such as the transmission structure of a motor
vehicle (not shown).
The casing receives the
pump drive shaft I l journalled at one ‘end in a
bearing l2 carried by the casing and supported
for self adjustment whereby wear is minimized,
?uid seal is promoted, and manufacture and as
at the other end in a cylindrical ported base por
sembly of the pump parts is facilitated.
tion l3 of the casing in a manner more particu
A further object of my invention is to provide
30 an improved control of the pressure of the ?uid
larlyhereinafter set forth. .
developed by the pump; minimize noise incident
to operation of the pump and particularly dur
ing the porting events in the cycle of pumping
operation; and to provide a compact and novel
35 arrangement of pressure accumulator and control
thereto and adapted to receive power from a suit:
of pressure delivery.
In carrying out the objects of my invention, I
preferably employ a pump of the wabble plate
type adapted to vary its inclination or “level-off”
4 6 in response to ?uid pressure delivery to auto
matically maintain a predetermined delivery
pressure; also to minimize movement of the pump
parts after the iluid has reached its predetermined
lb 4271 desired pressure.
As a feature of my invention
the pump is arranged for maximum delivery to
quickly build up its desired pressure, the fluid‘
displacement by the‘ pump then Ming quickly
reduced. instead of being gradually reduced as
5D the pressure builds up to the desired maximum.
Further objects and advantages of my inven
reside in the novel combination and arrangement ‘of. parts more particularly hereinafter de
scribed and claimed, reference being had to the
55 accompanying drawings illustrating several em
The shaft H has a drive gear Ill suitably ?xed
able source such as a drive shaft of the transmis
sion (not shown); Base 13 has inlet and outlet
passages l5 and i6 respectively for the ?uid, such
as oil, admitted to the pump and delivered there
from under pressure. The inlet i5 is exposed to
a suitable reservoir of oil which has a level above
this passage or in suitable communication with a’
reservoir of oil as may be desired.
Tightly pressed into the cylindrical opening ll
of base 93 is a cylindrical port seat body or ring
it formed of bronze or other suitable material
journalling the adjacent end of shaft 5 I, this body
having inlet and outlet passages l9 and 20 com
municating radially at one end with passages l5
and it respectively. The other ends of the pas
sages l§ and 20 form circumferentially spaced
arcuate inlet and outlet ports 2i and 22 having
their adjacent ends terminating in relatively nar
row pairs of grooves 23, 24 and 23a, 24E. The
grooves. of each pair taper toward each other
(see Fig. 6) and are brought closely together
preferably sumciently so that they are momen
tarily brought into communication with each
other by the inlet and outlet ports of the pumping ‘begin suction intake, the pressure delivery as the
cylinders as will presently be apparent. ‘
piston moves to the outward limit of its travel
Surrounding shaft II for rotation therewith is is not abruptly cut-off but such action takes place
the pump rotor B preferably of steel or other suit ' very gradually as the port 28 progressively moves
able material. This body is keyed or otherwise to include groove 24‘. Since groove 24'. narrows
?xed at 25 to shaft II and preferably has a. toward groove 22‘, the cut-off is further accentu
clearance with the shaft su?'lcient‘to permit the
body to slightly shift its position so that the
surface at the cylinder head end 26, which is
10 rotatably slidably engaged with the adjacent
ported surface of body l8, may accommodate it
self to the latter surface. More speci?cally, in
the form illustrated, the body B has a generally
cylindrical opening 21 accommodating the shaft
15 II, this opening tapering from the keyed end of
body B, which ?ts the shaft, to the opposite end.
ated in a gradual manner, the port 28 momentar
ily registering with groove 23'- just prior to pas
sage beyo'nd groove 24'. In this manner I have
found that a very quiet and e?lcient pumping 10
action is obtained, free from hydraulic "hammer”
and other noises incident to pumping. In passing
from intake to pressure delivery between parts 2 i
and 22, I preferably provide similar grooves 22,
24 for a similar action with each cylinder port 15
29 as will be readily understood. -
The body B may thus rock 'about its inner end
When the pump is initially operated, the pres
at key 25 for relatively free movement at the sure of the oil delivered at 41 to cylinder D rapidly
surface of ports 2i, 22 whereby the bodies l8 builds up to the desired amount, say 500 pounds
20 and B are relatively self-adjustable to provide
per square inch for example, and as this pressure
and maintain a good fit preventing leakage, wear,‘ is nearly reached (determined by the vvalue of
and binding of the parts. Furthermore, when the spring 44) ‘the piston 43 moves outwardly increas
pump is run-in, a self-lapping action takes place ing the capacity of cylinder D and moving rod 45
at the rubbing surfaces between bodies i8 and B. into contact with lever 40. Continued movement
The body B has a plurality of circumferentially swings lever 40 and thereby swings plate C about
spaced cylinders 28 opening inwardly toward a its pivot 36 into a position approximately trans
wabble or swash plate C, the cylinder head portion ' verse to the axis of shaft l I. This levelling-oi! of
26 having ports 29 for each cylinder. These plate C progressively lessens the stroke of pistons
ports, as body B rotates, successively register with 20 until they finally are substantially motionless
30 ports 2| and 22 so that they are alternately intake 7' so far as reciprocation is concerned, assuming of
and discharge ports.
course that oil under pressure is not being re
‘Each cylinder 28 slidably receives a piston 30 lieved from the delivery system. Any minor leak
' urged inwardly by a spring 3| into contact with ages which may be present in the delivery system
plate C, the inner rounded end 32 of each piston will require only a small movement of the pistons
35 slidably engaging the outer ring 33 of the plate to maintain the maximum desired oil pressure in
C. This ring is supported by bearing 34 ‘carried by the cylinder D.
By normally spacing rod 45 from lever 40, there
a swinging arm 35 pivotally supported at 36 from
casing A. At the other side of shaft II the arm is provided a lost motion connection between the
35 is pivotally connected at 31 ‘to an outwardly wabble plate structure and the control therefor
extending link 38 pivoted at 39 to a lever 40. The and the plate C does not start to level-off as soon
lever is pivotally supported at 4! to a projection as piston 43 begins to move accompanied by fur
42 of the outer'closed end of the accumulator cyl
ther compression of spring 44 so that the maxi
inder D.
mum stroke of the pistons 22 is realized longer
Slidable in cylinder D is a piston 43 urged in
45 wardly by a heavy spring 44, the piston having an
outwardly extending rod 45 adapted to engage
lever 40 to swing the latter to the dotted position
in Fig. l for levelling-off the plate C and mini
mizing or eliminating reciprocation of pistons 30.
50 Piston 43 moves against spring 44 in response to
a predetermined desired pressure of'the ?uid de
livered by the pump, the delivery passage 20 being
in communication through passage 48 with, the
accumulator cylinder D at the discharge 41. The
oil under pressure is led to a suitable point of
usage from cylinder D through the casing passage
48. A cover plate 49 is ~secured by fasteners II to
the inner end of the casing A and closes oi‘! the
inner end of cylinder D and the chamber of aux
than otherwise.
In this manner the maximum.
pump pressure is rapidly attained. The plate C 45
is, of course,_free to assume any position inter- -
mediate its‘ inclined position of Fig. 1 and its
fully levelled-oi! position under control of rod 45
according to the demand placed on the delivery
system. It will therefore be understood that while
the wabble plate C is normally swingable about its
pivotal mounting in response to actuation of the
control therefor, including the rod 45, this plate
is free from such movement and is not actuated
when the control member is operated in opposite 55
directions respectively by the ?uid pressure with
in the cylinder D and the spring 44 in taking up
and establishingthe lost motion connection be
tween the plate 40 and the control therefor.
It should be noted that, in levelling-off, the so
60 iliary pump E where such pump is employed. 7
The pump E comprises a driving gear II and . plate 0 moves the pistons 2| outwardly to the
driven gear 52 together with oil inlet and outlets ' outer limit of their travel.
This is desirable in
53, “respectively, and is-adapted to supply oil
minimizing air trapping between cylinder head 20
under a relatively low pressure to lubricate parts
and'the outer ends of cylinders 28.
The accumulator cylinder D stores oil under
65 of the engine or ‘transmission (not shown).
As the shaft l I drives rotor B, with plate vC posi 1 pressure so that when oil is delivered under pres
tioned as- in Fig. 1 for maximum piston stroke. " sure at passage 40, the spring 44 expands and
bapproximately half of pistons 20 are ‘moving in
tends to prevent an otherwise rapid fall of the
wardly drawing in oil thro'ugh port 2| and ports ?uid prasure.
The side-by-side arrangement of my mtor B
70 29 associated therewith, while the remaining pisa
tons are discharging oil under pressure through and cylinder D is important, where .a'n accumu
their associated ports 28 and- outlet port 22 for lator is employed, since such arrangement makes
passage to cylinder D at 41. As, eachv port 20 for a compact assembly and low manufacturing
moves across the face of~ body ll between ports cost; furthermore, I have utilized the accumu
22 and 2i thereof to cut-o?pressure deliveryand
later spring 44 also asthe load medium control-' 76‘
ling the regulation of the stroke oi’ pistons 3| and
consequently controlling regulation of the pump‘
What 1,018.!!! is:
Ina ?uid pump, a supporting structure, a drive
,,shaft’ Journaled in said supporting structure, a
Referring now to the modified form of my my / rotor drivingly connected to said shaft and hav
vention shown in Fig. 7, I have illustrated only a ing a plurality of cylinders spaced around said
portion of the pump assembly of Fig. 1,, iii/being shaft and extending in the direction of the axis
understood that my Fig. 7- structure may be of rotation of said shaft, pistons reciprocating in
readily used withrthe Fig. 1 assembly as will be said cylinders respectively, a wabble plate pivoted
readily understood. Similar parts are designated. for swinging movement and adapted to actuate
10, by similar reference characters.
said pistons, means for successively supplying 10
' In Fig. 7 the body 8' does not have a clear
ance with shaft H’, the relative self-adjusting
movement between the face of cylinder head 26'
having ports 20' and the face of the non-rotating
member 55 having inlet and outlet ports 2i,'22
resulting in a self-lapping and sealing action as
aforesaid._ Thus, the casing part if tightly re
ceives the cylindrical body I!’ formed with in
take and delivery passages 19' and 20’ but the
20 adjustable member 55 is now interposed between
bodies I.’ and B’.
?uid to said cylinders and for conducting ?uid
under pressure therefrom, a cylinder disposed
adjacent said rotor and extending in the general
direction of said shaft, a wabble plate control‘
piston in said cylinder, means for conducting
?uid under pressure from said ?uid conducting
means to said cylinder for operating said control
piston, a spring, acting to’ oppose movement, of
said control piston by said ?uid pressure, a rod
secured at one end thereof to said piston and ex
tending through said spring, a lever supported
The member 55 is formed with a spherical con
for pivotal movement and lying beyond but in
vex outer face 56 ?tting a like concave spherical the path of movement of the other end of said
face of body I!’ so that relative adjustment may rod and constituting a lost motion connection be-_
25 readily take place between the relatively rotating tween said control piston and said wabble plate,
faces of body B’ and member I5. In order to and a link connecting said lever and wabble plate
permit the desired small amount of relative for swinging said wabble plate in response ,to
movement between body it’ and member 55 and ‘movement by said control piston, said lost mo-"
at the same time to prevent member 65 from tion connection accommodating substantial ?uid
rotating with body B’, a pin 51 is passed through pressure movement of- said piston prior to swing
body II’ and enters member I! (circumferentially ing movement‘of said wabble plate in response‘to
spaced from passages l9’ and 20') in an opening ?uid pressure’ in said cylinder.
58 thereof having a clearance with pin 51.
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