US3037455A - Pumps - Google Patents
Pumps Download PDFInfo
- Publication number
- US3037455A US3037455A US682045A US68204557A US3037455A US 3037455 A US3037455 A US 3037455A US 682045 A US682045 A US 682045A US 68204557 A US68204557 A US 68204557A US 3037455 A US3037455 A US 3037455A
- Authority
- US
- United States
- Prior art keywords
- pump
- drive shaft
- shaft
- torsionally resilient
- resilient drive
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16N—LUBRICATING
- F16N13/00—Lubricating-pumps
- F16N13/20—Rotary pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C11/00—Combinations of two or more machines or pumps, each being of rotary-piston or oscillating-piston type; Pumping installations
- F04C11/005—Combinations of two or more machines or pumps, each being of rotary-piston or oscillating-piston type; Pumping installations of dissimilar working principle
Definitions
- This invention relates to pumps and pumping mechanisms and more particularly to a pumping mechanism in which a pump having high amplitude, low frequency pulsating flow characteristic and another driven means are driven by a common shaft.
- the present invention contemplates the mounting of a pump of the rotary type having cooperating internal and external rotors with intermeshing lobes, for example, a gerotor on the same shaft as a pump of the vane type.
- Such an assembly is ideally suited as a combination oil pump for engine lubrication and vacuum pump for use in operating Windshield wipers, with the rotary pump serving as the oil pump and the vane pump serving as the vacuum pump.
- a well known characteristic of this type of rotary pump is the high amplitude, low frequency pulsating flow delivery caused by finite amounts of fluid being trapped between the lobes of the inner and outer rotors and then delivered to the outlet of the pump.
- High pressures are developed in the pump and then suddenly relieved as the pump delivers the finite amount of fluid trapped between the lobes of the inner and outer rotors to the pump outlet.
- Such increases and decreases of pressure inside the pump cause a transient oscillating motion to be superimposed upon the steady state rotary motion of the rotors caused by its driving means.
- This invention seeks to avoid difficulties of the above mentioned nature by providing a relatively long resilient drive shaft which is fixed to the driven member of the pump having high amplitude, low frequency pulsating flow characteristic, for example, the internal rotor of a rotary pump, at a considerable distance axially from the point on the shaft where the other driven means, for example, the rotor of a vane pump, is affixed.
- This provides a means of energy storage for the forces created by the oscillations of the driven member of the pump having the pulsating flow characteristic, of sufficient resiliency to absorb these oscillations repeatedly without fatigue failure.
- the portion of the shaft between which the two members are fastened winds and unwinds, so to speak, as the pulsations are delivered to it by the driven member of the pump having the pulsating flow characteristic and simultaneously drives the second driven means.
- an object of the present invention is the provision of a resilient drive shaft having a driven member of a pump having high amplitude, low frequency pulsating flow characteristic afiixed thereto at a substantial distance axially from a point where another driven means is affixed.
- Another object of the invention is to provide a driven member of a pump having high amplitude, low frequency pulsating flow characteristic and another driven means mounted for actuation upon a common torsionally resilient shaft at such a distance axially from each other on the shaft that the oscillations produced by the driven member of the pump can be taken up by the length of shaft between the two members.
- a further object of the invention is to provision of a rotary oil pump for an internal combustion engine and a vacuum pump for the operation of windshield wipers mounted for actuation on a common shaft thereby effecting a saving in space and materials.
- FIGURE 1 is a top plan view of two pumps incorporating the driving means of the present invention
- FIGURE 2 is an elevational view of the pumps shown in FIGURE 1 a portion of which is in section;
- FIGURE 3 is a top plan view of the rotor assembly of the rotary pump
- FIGURE 4 depicts a top plan view of the vane pump taken along the lines 44 of FTGURE l;
- FIGURE 5 shows an elevational view of the shaft of the present invention.
- FIGURES 1 and 2 illustrate a preferred embodiment of the invention, a rotary pump mechanism generally designated by the numeral 16 and a vane type pump mechanism generally designated by the numeral 11.
- the rotary pump has an inlet and outlet designated by the numerals 12 and 13 respectively, while the vane pump has an inlet and outlet designated by the numerals 14 and 15 respectively.
- the rotary pump mechanism 10 may be of conventional construction employing a driven member, for ex? ample, inner rotor 16 having one less tooth than the outer rotor 17.
- the inner rotor 16 is provided with a bore 18 into which is fitted a sleeve 21 having a portion 22 which is adapted to receive drive member or shaft 23.
- the sleeve 21 is afiixed to the inner rotor 16 for rotation therewith.
- portion 22 is positioned a considerable distance above the rotor 16 and that the internal diameter of the sleeve 21 below the portion 22 is considerably greater than the maximum diameter of the shaft 23, so that the rotor 16 is driven by the shaft 23 only at that point where the portion 22 of the sleeve 21 engages the shaft.
- the vane pump mechanism employs a driven means, for example, a rotor 24 having a pair of vanes 25 and 26 and the rotor is eccentrically mounted in the housing 27 which has a central bore 28.
- the vanes are constructed of a graphite base composition bonded by a resin and are positioned in slots 31 and 32 in the rotor 24.
- the edges of the vanes are urged against the bore 28 by means of a helical spring 33 mounted on a shaft 34 which extends into the vanes and through the center of the rotor 24 and above the shaft 35 upon which the rotor 24 is rotationally mounted.
- This shaft is afiixed to the lower portion of the housing 27, for example, the housing detail and comprises an end portion 38 separated from the main body of the shaft 41 by a portion of reduced diameter 42. There is also provided a skirt 43 adapted to fit in a second portion of reduced diameter.
- the shaft is preferably made from a metal exhibiting high torsional resiliency and high resistance to fatigue failure. For example, a case hardened steel such as SAE 1030 is ideally suited for construction of this shaft.
- the end 38 of the shaft 23 is positioned in the internal portion of the nut 37 with the portion of reduced diameter 42 extending just above the nut.
- the shaft 23 also extends through the sleeve 21 and engages the portion 22 of said sleeve.
- the drive shaft 23 can be driven by any power means but in the application where the rotary pump is utilized as an oil pump and the vane pump is utilized as a vacuum pump to operate windshield wipers, the shaft can conveniently be driven by the distributor gearing of the internal combustion engine upon which it is mounted.
- the shaft 23 is driven by a source of power, such as the distributor gearing thereby imparting a steady state rotation to the shaft 23 which in turn imparts a steady state rotation to the internal rotor 16 and the external rotor 17 of the rotary pump and the rotor 24 of the vane pump.
- Both of these pumps therefore operate to bring fluids into thei respective inlets and to discharge the fluids from their respective outlets.
- superimposed upon the steady state rotation of the internal rotor 16 and the external rotor 17 is a transient oscillatory motion caused by the high amplitude, low frequency pulsating nature of the pumping action of the rotary pump.
- the vane type pump on the other hand is characterized by a relatively steady flow when used as a vacuum pump for a windshield wiper mechanism at it is pumping air, a compressible fluid.
- the comparatively long torsionally resilient shaft 23 is ideally suited to absorb this energy as it is capable of torsional flexure of suflicient degree to provide a proper connection between the two pumps without danger of failure due to fatigue.
- the connection of the internal rotor 16 to the shaft 23 by means of the portion 22 of the sleeve 21 is spaced a considerable distance axially from the connection of the rotor 24 to the end 38 of the shaft 23 by means of the nut 37.
- the reduced portion 42 of the shaft 23 provides a safety feature, for if the shaft 23 fails due to the torsion described above, it will fail at this point where the shaft has the least cross-sectional area. This insures the proper operation of the rotary pump, which, when used as the oil pump of an internal combusition engine, is critical, for the oil pump of the engine must be kept in operation even though the shaft may fail at the point 42.
- the sleeve 43 prevents the shaft '23 from moving down against the spring system 33 as it abuts the top of the portion 22 of the sleeve 21.
- the present invention provides a simple, inexpensive and reliable common drive for a pump having 4 pulsating flow characteristics and another driven means.
- a positive displacement fluid pump having high amplitude, low frequency pulsating flow characteristics
- said fluid pump having a driven member, said driven member having a bore positioned therein, a sleeve positioned in said bore and aflixed to said driven member, a rotatable torsionally resilient drive shaft aflixed to said sleeve a substantial distance from one end of said torsionally resilient drive shaft, a source of power operatively connected to said torsionally resilient drive shaft at a point axially spaced from said sleeve for causing said torsionally resilient drive shaft to rotate, said fluid pump imparting an oscillatory motion to said driven member aid to said torsionally resilient drive shaft when in operation to impose an oscillatory motion upon its ro tary motion, a drive means affixed to said one end of said torsionally resilient drive shaft and adapted to be driven thereby, the distance between the point where said sleeve is aflixe
- a positive displacement fluid pump having high amplitude, low frequency pulsating flow characteristics
- said fluid pump having a driven member, said driven member having a bore positioned therein, a sleeve positioned in said bore and aflixed to said driven member, a rotatable torsionally resilient drive shaft aflixed to said sleeve a substantial distance from one end of said torsionally resilient drive shaft, a source of power operatively connected to said torsionally resilient drive shaft at a point axially spaced from said sleeve for causing said torsionally resilient drive shaft to rotate, said fluid pump imparting an oscillatory motion to said driven member and to said torsionally resilient drive shaft when in operation to impose an oscillatory motion upon its rotary motion, a driven means aflixed to said one end of said torsionally resilient drive shaft and adapted to be driven thereby, the distance between the point where said sleeve is aflixed to said
- a positive displacement fluid pump having high amplitude, low frequency pulsating flow characteristics
- said fluid pump having a driven member, said driven member having a bore positioned therein, a sleeve positioned in said bore and affixed to said driven member, a rotatable torsionally resilient drive shaft aflixed to said sleeve a substantial distance from one end of said torsionally resilient drive shaft, a source of power operatively connected to said torsionally resilient drive shaft at a point axially spaced from said sleeve for causing said torsionally resilient drive shaft to rotate, said fluid pump imparting an oscillatory motion to said driven member and to said torsionally resilient drive shaft when in operation to impose an oscillatory motion upon its rotary motion, a fluid pump having substantially constant flow characteristics, said fluid pump having substantially constant flow characteristics having a driven pumping means, means operatively connecting said driven pumping means to said one end of said torsionally resilient drive shaft for rotation there
- a pumping mechanism comprising a rotary pump including an external rotor and an internal rotor having intermeshing lobes, a sleeve afiixed to said internal rotor, a rotatable torsionally resilient drive shaft affixed to said sleeve a substantial distance from one end of said torsionally resilient drive shaft, a source of power operatively connected to said torsionally resilient drive shaft at a point axially spaced from said sleeve, said rotary pump imparting an oscillatory motion to said internal rotor and to said torsionally resilient drive shaft when in operation to impose an oscillatory motion upon its rotary motion, driven means affixed to said one end of said torsionally resilient drive shaft and adapted to be driven thereby, the distance between the point Where said sleeve is aflixed to said torsionally resilient drive shaft and said one end and the torsional resiliency of said torsionally resilient drive shaft being sufi
- a pumping mechanism comprising a rotary pump including an external rotor and an internal rotor having intermeshing lobes, a sleeve aifixed to said internal rotor, a rotatable torsionally resilient drive shaft aifixed to said sleeve a substantial distance from one end of said torsionally resilient drive shaft, a source of power operatively connected to said torsionally resilient drive shaft at a point axially spaced from said sleeve, said rotary pump imparting an oscillatory motion to said internal rotor and to said torsionally resilient drive shaft when in operation to impose an oscillatory motion upon its rotary motion, driven means afiixed to said one end of said torsionally resilient drive shaft and adapted to be driven thereby, the distance between the point where said sleeve is aflixed to said torsionally resilient drive shaft and said one end and the torsional resiliency of said torsionally resilient drive shaft being sufi
- a rotary pump including an external rotor and an internal rotor having intermeshing lobes, said internal rotor having a bore positioned therein, a sleeve positioned in said bore and afiixed to said internal rotor, a rotatable resilient drive shaft affixed to said sleeve a substantial distance from one end of said torsionally resilient drive shaft, a source of power operatively connected to said torsionally resilient drive shaft at a point axially spaced from said sleeve for causing said torsionally resilient shaft to rotate, said rotary pump imparting an oscillatory motion to said internal rotor and to said torsionally resilient drive shaft when in operation to impose an oscillatory motion upon its rotary motion, a vane type pump having a housing and a rotor eccentrically mounted in said housing, means afiixing said rotor of said vane pump to said torsionally resilient drive shaft at said one end,
Description
June 5, 1962 M. s. BOZIMOWSKI ETAL 7,
PUMPS Filed Sept. 4, 1957 2 Sheets-Sheet 1 ME mmw M O 1 N BTW e SJ m H MH. Mf &2 m 4 H 3 H W W a E 7. a w 2 FIG.
ATT RNEYS June 5, 1962 Filed Sept. 4, 1957 M. S. BOZIMOWSKI ETAL PUMPS 2 Sheets-Sheet 2 M. S. BOZIMOWSKI H.J. TAMAGNE [a Wag/IZVZNTORS BYjga ATTO NEYS Unite atent 3,037,455 PUMPS Mitchell S. Bozimowski and Henry J. Tamagne, Dearhorn, Mich, assignors to Ford Motor Company, Dearborn, Micl1., a corporation of Delaware Filed Sept. 4, 1957, Ser. No. 682,045 6 Claims. (Cl. 103-4) This invention relates to pumps and pumping mechanisms and more particularly to a pumping mechanism in which a pump having high amplitude, low frequency pulsating flow characteristic and another driven means are driven by a common shaft. Although not so limited, the present invention contemplates the mounting of a pump of the rotary type having cooperating internal and external rotors with intermeshing lobes, for example, a gerotor on the same shaft as a pump of the vane type. Such an assembly is ideally suited as a combination oil pump for engine lubrication and vacuum pump for use in operating Windshield wipers, with the rotary pump serving as the oil pump and the vane pump serving as the vacuum pump.
A well known characteristic of this type of rotary pump is the high amplitude, low frequency pulsating flow delivery caused by finite amounts of fluid being trapped between the lobes of the inner and outer rotors and then delivered to the outlet of the pump. High pressures are developed in the pump and then suddenly relieved as the pump delivers the finite amount of fluid trapped between the lobes of the inner and outer rotors to the pump outlet. Such increases and decreases of pressure inside the pump cause a transient oscillating motion to be superimposed upon the steady state rotary motion of the rotors caused by its driving means.
If a second pump or other driven means having substantial rotational inertia were attached to the rotor of the rotary pump by means of a key or other short shaft, the transient oscillations of the driven rotor will cause severe torsional stresses to be produced within the key or short shaft resulting in fatigue failure, thereby rendering the second pump or other driven means inoperative.
This invention seeks to avoid difficulties of the above mentioned nature by providing a relatively long resilient drive shaft which is fixed to the driven member of the pump having high amplitude, low frequency pulsating flow characteristic, for example, the internal rotor of a rotary pump, at a considerable distance axially from the point on the shaft where the other driven means, for example, the rotor of a vane pump, is affixed. This provides a means of energy storage for the forces created by the oscillations of the driven member of the pump having the pulsating flow characteristic, of sufficient resiliency to absorb these oscillations repeatedly without fatigue failure. Thus, the portion of the shaft between which the two members are fastened winds and unwinds, so to speak, as the pulsations are delivered to it by the driven member of the pump having the pulsating flow characteristic and simultaneously drives the second driven means.
Accordingly, an object of the present invention is the provision of a resilient drive shaft having a driven member of a pump having high amplitude, low frequency pulsating flow characteristic afiixed thereto at a substantial distance axially from a point where another driven means is affixed.
Another object of the invention is to provide a driven member of a pump having high amplitude, low frequency pulsating flow characteristic and another driven means mounted for actuation upon a common torsionally resilient shaft at such a distance axially from each other on the shaft that the oscillations produced by the driven member of the pump can be taken up by the length of shaft between the two members.
A further object of the invention is to provision of a rotary oil pump for an internal combustion engine and a vacuum pump for the operation of windshield wipers mounted for actuation on a common shaft thereby effecting a saving in space and materials.
Other objects and attendant advantages will become apparent as the specification is considered in conjunction with the accompanying drawings which show a preferred embodiment of the present invention in which:
FIGURE 1 is a top plan view of two pumps incorporating the driving means of the present invention;
FIGURE 2 is an elevational view of the pumps shown in FIGURE 1 a portion of which is in section;
FIGURE 3 is a top plan view of the rotor assembly of the rotary pump;
FIGURE 4 depicts a top plan view of the vane pump taken along the lines 44 of FTGURE l; and,
FIGURE 5 shows an elevational view of the shaft of the present invention.
Referring now to the drawings in which like reference numerals designate like parts throughout the several views thereof, there is shown in FIGURES 1 and 2, which illustrate a preferred embodiment of the invention, a rotary pump mechanism generally designated by the numeral 16 and a vane type pump mechanism generally designated by the numeral 11. The rotary pump has an inlet and outlet designated by the numerals 12 and 13 respectively, while the vane pump has an inlet and outlet designated by the numerals 14 and 15 respectively. When the invention is employed in an internal combustion engine as a combination oil pump and vacuum pump, the inlet 12 of the rotary pump is connected to receive oil from the oil pan and the outlet 13 is connected to redeliver the oil to the engine under pressure, while the vane pump inlet 14 is connected to the windshield wiper system of the automobile and the outlet 15 is open to the atmosphere to serve as an exhaust port for the pump.
The rotary pump mechanism 10 may be of conventional construction employing a driven member, for ex? ample, inner rotor 16 having one less tooth than the outer rotor 17. The inner rotor 16 is provided with a bore 18 into which is fitted a sleeve 21 having a portion 22 which is adapted to receive drive member or shaft 23. The sleeve 21 is afiixed to the inner rotor 16 for rotation therewith. It will be noted from FIGURE 1 that the portion 22 is positioned a considerable distance above the rotor 16 and that the internal diameter of the sleeve 21 below the portion 22 is considerably greater than the maximum diameter of the shaft 23, so that the rotor 16 is driven by the shaft 23 only at that point where the portion 22 of the sleeve 21 engages the shaft.
The vane pump mechanism employs a driven means, for example, a rotor 24 having a pair of vanes 25 and 26 and the rotor is eccentrically mounted in the housing 27 which has a central bore 28. The vanes are constructed of a graphite base composition bonded by a resin and are positioned in slots 31 and 32 in the rotor 24. The edges of the vanes are urged against the bore 28 by means of a helical spring 33 mounted on a shaft 34 which extends into the vanes and through the center of the rotor 24 and above the shaft 35 upon which the rotor 24 is rotationally mounted. This shaft is afiixed to the lower portion of the housing 27, for example, the housing detail and comprises an end portion 38 separated from the main body of the shaft 41 by a portion of reduced diameter 42. There is also provided a skirt 43 adapted to fit in a second portion of reduced diameter. The shaft is preferably made from a metal exhibiting high torsional resiliency and high resistance to fatigue failure. For example, a case hardened steel such as SAE 1030 is ideally suited for construction of this shaft.
The end 38 of the shaft 23 is positioned in the internal portion of the nut 37 with the portion of reduced diameter 42 extending just above the nut. The shaft 23 also extends through the sleeve 21 and engages the portion 22 of said sleeve. Thus, it is readily apparent that the shaft is coupled to the internal rotor 16 of the rotary pumping mechanism by means of portion 22 of sleeve 21, and to the rotor 24 of the vane pump by means of the nut 37.
The drive shaft 23 can be driven by any power means but in the application where the rotary pump is utilized as an oil pump and the vane pump is utilized as a vacuum pump to operate windshield wipers, the shaft can conveniently be driven by the distributor gearing of the internal combustion engine upon which it is mounted.
In the operation of the device, the shaft 23 is driven by a source of power, such as the distributor gearing thereby imparting a steady state rotation to the shaft 23 which in turn imparts a steady state rotation to the internal rotor 16 and the external rotor 17 of the rotary pump and the rotor 24 of the vane pump. Both of these pumps therefore operate to bring fluids into thei respective inlets and to discharge the fluids from their respective outlets. Superimposed upon the steady state rotation of the internal rotor 16 and the external rotor 17 is a transient oscillatory motion caused by the high amplitude, low frequency pulsating nature of the pumping action of the rotary pump. The vane type pump on the other hand is characterized by a relatively steady flow when used as a vacuum pump for a windshield wiper mechanism at it is pumping air, a compressible fluid.
Mounting these two pumps on a common shaft results in a saving of space and material with an attendant cost reduction. However, the connection (drive shaft 23) between these two pumps must be capable of absorbing the energy created by the transient oscillatory motion of the rotors of the rotary pump.
The comparatively long torsionally resilient shaft 23 is ideally suited to absorb this energy as it is capable of torsional flexure of suflicient degree to provide a proper connection between the two pumps without danger of failure due to fatigue. As can readily be appreciated by reference to FIGURE 1, the connection of the internal rotor 16 to the shaft 23 by means of the portion 22 of the sleeve 21 is spaced a considerable distance axially from the connection of the rotor 24 to the end 38 of the shaft 23 by means of the nut 37. This permits the torsionally resilient shaft 23 to flex torsionally between these two connections so that the energy difference between the internal rotor 16 of the rotary pump and the rotor 24 of the vane pump caused by the transient oscillatory motion of the internal rotor of the rotary pump can be readily absorbed without danger of fatigue failure of the connection.
The reduced portion 42 of the shaft 23 provides a safety feature, for if the shaft 23 fails due to the torsion described above, it will fail at this point where the shaft has the least cross-sectional area. This insures the proper operation of the rotary pump, which, when used as the oil pump of an internal combusition engine, is critical, for the oil pump of the engine must be kept in operation even though the shaft may fail at the point 42. The sleeve 43 prevents the shaft '23 from moving down against the spring system 33 as it abuts the top of the portion 22 of the sleeve 21.
Thus the present invention provides a simple, inexpensive and reliable common drive for a pump having 4 pulsating flow characteristics and another driven means.
We claim as our invention:
1. In a pumping mechanism, a positive displacement fluid pump having high amplitude, low frequency pulsating flow characteristics, said fluid pump having a driven member, said driven member having a bore positioned therein, a sleeve positioned in said bore and aflixed to said driven member, a rotatable torsionally resilient drive shaft aflixed to said sleeve a substantial distance from one end of said torsionally resilient drive shaft, a source of power operatively connected to said torsionally resilient drive shaft at a point axially spaced from said sleeve for causing said torsionally resilient drive shaft to rotate, said fluid pump imparting an oscillatory motion to said driven member aid to said torsionally resilient drive shaft when in operation to impose an oscillatory motion upon its ro tary motion, a drive means affixed to said one end of said torsionally resilient drive shaft and adapted to be driven thereby, the distance between the point where said sleeve is aflixed to said torsionally resilient drive shaft and said one end and the torsional resiliency of said torsionally resilient drive shaft being sufficient to absorb substantially all of the pulsating energy which may be imparted to said torsionally resilient drive shaft by the oscillatory motion of said driven member.
2. In a pumping mechanism, a positive displacement fluid pump having high amplitude, low frequency pulsating flow characteristics, said fluid pump having a driven member, said driven member having a bore positioned therein, a sleeve positioned in said bore and aflixed to said driven member, a rotatable torsionally resilient drive shaft aflixed to said sleeve a substantial distance from one end of said torsionally resilient drive shaft, a source of power operatively connected to said torsionally resilient drive shaft at a point axially spaced from said sleeve for causing said torsionally resilient drive shaft to rotate, said fluid pump imparting an oscillatory motion to said driven member and to said torsionally resilient drive shaft when in operation to impose an oscillatory motion upon its rotary motion, a driven means aflixed to said one end of said torsionally resilient drive shaft and adapted to be driven thereby, the distance between the point where said sleeve is aflixed to said torsionally resilient drive shaft and said one end and the torsional resiliency of said torsionally resilient drive shaft being sufficient to absorb substantially all of the pulsating energy which may be imparted to said torsionally resilient drive shaft by the oscillatory motion of said driven member, said torsionally resilient drive shaft having a portion of reduced cross section located between the position on said torsionally resilient drive shaft where said sleeve is aflflxed and said one end.
3. In a pumping mechanism, a positive displacement fluid pump having high amplitude, low frequency pulsating flow characteristics, said fluid pump having a driven member, said driven member having a bore positioned therein, a sleeve positioned in said bore and affixed to said driven member, a rotatable torsionally resilient drive shaft aflixed to said sleeve a substantial distance from one end of said torsionally resilient drive shaft, a source of power operatively connected to said torsionally resilient drive shaft at a point axially spaced from said sleeve for causing said torsionally resilient drive shaft to rotate, said fluid pump imparting an oscillatory motion to said driven member and to said torsionally resilient drive shaft when in operation to impose an oscillatory motion upon its rotary motion, a fluid pump having substantially constant flow characteristics, said fluid pump having substantially constant flow characteristics having a driven pumping means, means operatively connecting said driven pumping means to said one end of said torsionally resilient drive shaft for rotation therewith, the distance between the point where said sleeve is affixed to said torsionally resilient drive shaft and said one end and the torsional resiliency of said torsionally resilient drive shaft being sufiicient to absorb substantially all of the pulsating energy which may be imparted to said torsionally resilient drive shaft by the oscillatory motion of said driven member.
4. A pumping mechanism comprising a rotary pump including an external rotor and an internal rotor having intermeshing lobes, a sleeve afiixed to said internal rotor, a rotatable torsionally resilient drive shaft affixed to said sleeve a substantial distance from one end of said torsionally resilient drive shaft, a source of power operatively connected to said torsionally resilient drive shaft at a point axially spaced from said sleeve, said rotary pump imparting an oscillatory motion to said internal rotor and to said torsionally resilient drive shaft when in operation to impose an oscillatory motion upon its rotary motion, driven means affixed to said one end of said torsionally resilient drive shaft and adapted to be driven thereby, the distance between the point Where said sleeve is aflixed to said torsionally resilient drive shaft and said one end and the torsional resiliency of said torsionally resilient drive shaft being sufiicient to absorb substantially all of the pulsating energy which may be imparted to said torsionally resilient drive shaft by the oscillatory motion of said internal rotor.
5. A pumping mechanism comprising a rotary pump including an external rotor and an internal rotor having intermeshing lobes, a sleeve aifixed to said internal rotor, a rotatable torsionally resilient drive shaft aifixed to said sleeve a substantial distance from one end of said torsionally resilient drive shaft, a source of power operatively connected to said torsionally resilient drive shaft at a point axially spaced from said sleeve, said rotary pump imparting an oscillatory motion to said internal rotor and to said torsionally resilient drive shaft when in operation to impose an oscillatory motion upon its rotary motion, driven means afiixed to said one end of said torsionally resilient drive shaft and adapted to be driven thereby, the distance between the point where said sleeve is aflixed to said torsionally resilient drive shaft and said one end and the torsional resiliency of said torsionally resilient drive shaft being sufiicient to absorb substantially all of the pulsating energy which may be imparted to said torsionally resilient drive shaft by the oscillatory motion of said internal rotor, said torsionally resilient drive shaft having a portion of reduced cross sectional area located between the position where said sleeve is affixed and the position where said driven means is afiixed.
6. In a pump mechanism, a rotary pump including an external rotor and an internal rotor having intermeshing lobes, said internal rotor having a bore positioned therein, a sleeve positioned in said bore and afiixed to said internal rotor, a rotatable resilient drive shaft affixed to said sleeve a substantial distance from one end of said torsionally resilient drive shaft, a source of power operatively connected to said torsionally resilient drive shaft at a point axially spaced from said sleeve for causing said torsionally resilient shaft to rotate, said rotary pump imparting an oscillatory motion to said internal rotor and to said torsionally resilient drive shaft when in operation to impose an oscillatory motion upon its rotary motion, a vane type pump having a housing and a rotor eccentrically mounted in said housing, means afiixing said rotor of said vane pump to said torsionally resilient drive shaft at said one end, the distance between the point where said sleeve is afiixed to said torsionally resilient drive shaft and said one end and the torsional resiliency of said torsionally resilient drive shaft being sufficient to absorb all of the pulsating energy which may be imparted to said torsionally resilient drive shaft by the oscillatory motion of said internal rotor of said rotary pump.
References Cited in the file of this patent UNITED STATES PATENTS 993,570 Webster May 30, 1911 1,147,428 Peterson July 20, 1915 1,150,441 Loose Aug. 17, 1915 1,490,219 Labberton, et a l. Apr. 15, 1924 1,874,681 Woolson Aug. 30, 1932 1,965,742 Junkers July 10, 1934 2,028,407 Moineau Jan. 21, 1936 2,055,014 Manger Sept. 22, 1936 2,098,718 Carninez, et al. Nov. 9, 1937 2,220,751 Bergman Nov. 5, 1940 2,331,045 Rappl Oct. 5, 1943 2,346,426 Hait Apr. 11, 1944 2,346,432 Heintz Apr. 11, 1944 2,437,954 Havill Mar. 16, 1948 2,460,649 Muller Feb. 1, 1949 2,487,439 Hasbrouck Nov. 8, 1949 2,490,115 Clarke Dec. 6, 1949 2,513,984 Witchger July 4, 1950 2,541,405 Chapman 'Feb. 13, 1951 2,590,169 =Fritz Mar. 25, 1952 2,647,380 Troeger, et al. Aug. 4, 1953 2,657,632 Kiefer Nov. 3, 1953 2,658,361 Kalikow Nov. 10, 1953 2,698,526 Beier Jan. 4, 1955 2,703,847 Kalikow Mar. 8, 1955 2,705,459 Dunning Apr. 5, 1955 2,734,359 Mulheim, et a1. Feb. 14, 1956 2,738,660 Gail Mar. 20, 1956 2,749,778 Kuhn June 12, 1956 2,767,658 Murray Oct. 23, 1956 2,772,546 Barrows Dec. 4, 1956 2,775,204 Batten, et a1. Dec. 25, 1956 2,776,556 Gustafson, et al. Jan. 8, 1957 2,790,311 Kalikow Apr. 30, 1957 2,809,503 Gaubatz, et al. Oct. 15, 1957 2,822,677 Reynolds Feb. 11, 1958 2,851,892 Parkinson, et al. Sept. 16, 1958 2,870,719 Murray et a1 Jan. 27, 1959 2,941,473 Lorenz June 21, 1960 2,955,536 Gaubatz Oct. 11, 1960 2,955,537 Gaubatz Oct. 11, 1960 FOREIGN PATENTS 588,303 Great Britain May 20, 1947 743,564 Great Britain Jan. 18, 1956 797,567 France Feb. 17, 1936 898,116 France June 26, 1944 900,188 'France Sept. 18, 1944 1,000,903 France Oct. 17, 1951
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US682045A US3037455A (en) | 1957-09-04 | 1957-09-04 | Pumps |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US682045A US3037455A (en) | 1957-09-04 | 1957-09-04 | Pumps |
Publications (1)
Publication Number | Publication Date |
---|---|
US3037455A true US3037455A (en) | 1962-06-05 |
Family
ID=24737977
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US682045A Expired - Lifetime US3037455A (en) | 1957-09-04 | 1957-09-04 | Pumps |
Country Status (1)
Country | Link |
---|---|
US (1) | US3037455A (en) |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3370540A (en) * | 1965-12-23 | 1968-02-27 | Gen Motors Corp | Pump construction |
US4497618A (en) * | 1983-09-12 | 1985-02-05 | General Motors Corporation | Combined vacuum pump and power steering pump assembly |
US6425749B1 (en) * | 1999-03-29 | 2002-07-30 | Robert Bosch Gmbh | Coupling and fuel-supply pump with coupling |
US20030188414A1 (en) * | 1998-10-16 | 2003-10-09 | Mark E. Baer | Motor shaft assembly and method |
US20090120405A1 (en) * | 2006-07-19 | 2009-05-14 | Knorr-Bremse Systeme Fuer Nutzfahrzeuge Gmbh | System with a Compressor and with a Consumer in a Motor Vehicle |
US20110116944A1 (en) * | 2009-05-08 | 2011-05-19 | Vanair Manufacturing, Inc. | Integrated compressor and pump unit and vehicles equipped therewith |
US20130022485A1 (en) * | 2011-07-19 | 2013-01-24 | Slw Automotive Inc. | Unified variable displacement oil pump and vacuum pump |
US10137222B2 (en) | 2015-03-27 | 2018-11-27 | 3M Innovative Properties Company | Fibrin composition, method and wound articles |
US10940233B2 (en) | 2016-10-05 | 2021-03-09 | 3M Innovative Properties Company | Fibrinogen composition, method and wound articles |
US11827754B2 (en) | 2016-10-05 | 2023-11-28 | 3M Innovative Properties Company | Fibrin composition comprising carrier material, method and wound articles |
Citations (47)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US993570A (en) * | 1908-07-06 | 1911-05-30 | Westinghouse Electric & Mfg Co | Resilient driving connection. |
US1147428A (en) * | 1913-04-15 | 1915-07-20 | Alfred Peterson | Rotary motor. |
US1150441A (en) * | 1915-02-16 | 1915-08-17 | Fortunawerke Specialmaschinenfabrik G M B H | Flexible coupling. |
US1490219A (en) * | 1924-04-15 | Resilient driving connection | ||
US1874681A (en) * | 1927-02-02 | 1932-08-30 | Packard Motor Car Co | Internal combustion engine |
US1965742A (en) * | 1931-01-21 | 1934-07-10 | Junkers Hugo | Driving mechanism for aircraft |
US2028407A (en) * | 1932-04-29 | 1936-01-21 | Moineau Rene Joseph Louis | Gear mechanism |
FR797567A (en) * | 1934-09-19 | 1936-04-29 | Bosch Robert | Elastic drive device for auxiliary devices of automobiles or airplanes |
US2055014A (en) * | 1935-03-11 | 1936-09-22 | Farrel Birmingham Co Inc | Coupling for rotatable elements |
US2098718A (en) * | 1933-03-17 | 1937-11-09 | Gen Motors Corp | Supercharger mechanism for internal combustion engines |
US2220751A (en) * | 1938-12-08 | 1940-11-05 | Gen Electric | Torsional vibration dampener |
US2331045A (en) * | 1941-05-07 | 1943-10-05 | Trico Products Corp | Pump |
US2346426A (en) * | 1941-10-30 | 1944-04-11 | Fmc Corp | Flexible rotary drive coupling |
US2346432A (en) * | 1942-11-10 | 1944-04-11 | Jack & Heintz Inc | Torsional vibration damper |
FR898116A (en) * | 1942-05-13 | 1945-04-11 | Hermes Patentverwertungs Gmbh | Connection between hollow shaft and oscillating shaft, in particular for electrical auxiliary controls |
FR900188A (en) * | 1942-10-23 | 1945-06-21 | Graetz Ag | Improvement to rotary machines applicable as multiple circulation pumps or as motors |
GB588303A (en) * | 1944-11-01 | 1947-05-20 | Karl Baumann | Improvements in and relating to the driving gear of reciprocating internal comustionpower plant |
US2437954A (en) * | 1943-01-30 | 1948-03-16 | Bendix Aviat Corp | Accessory drive control |
US2460649A (en) * | 1942-03-07 | 1949-02-01 | Geza W Muiler | Gear pump with flow cushioning means |
US2487439A (en) * | 1947-02-04 | 1949-11-08 | United Aircraft Corp | Automatically variable speed scavenge pump drive |
US2490115A (en) * | 1942-10-28 | 1949-12-06 | Bendix Aviat Corp | Variable displacement rotary pump |
US2513984A (en) * | 1947-11-21 | 1950-07-04 | Eaton Mfg Co | Internal gear pump |
US2541405A (en) * | 1946-12-18 | 1951-02-13 | Bowser Inc | Rotary hand pump |
FR1000903A (en) * | 1949-11-29 | 1952-02-18 | Elastic coupling device | |
US2590169A (en) * | 1951-01-31 | 1952-03-25 | Jack & Heintz Prec Ind Inc | Torsional drive shaft |
US2647380A (en) * | 1949-06-24 | 1953-08-04 | Bendix Aviat Corp | Flexible shaft |
US2657632A (en) * | 1951-02-16 | 1953-11-03 | Sundstrand Machine Tool Co | Two-stage fuel unit |
US2658361A (en) * | 1950-02-02 | 1953-11-10 | Gen Electric | Driving mechanism |
US2698526A (en) * | 1948-04-14 | 1955-01-04 | Beier Josef | Shaffing for power transmission in motor-driven vehicles |
US2703847A (en) * | 1953-11-24 | 1955-03-08 | Gen Electric | Driving mechanism for starter-generator |
US2705459A (en) * | 1950-11-09 | 1955-04-05 | Wilsons Sons Inc William M | Pump |
GB743564A (en) * | 1953-08-21 | 1956-01-18 | Guy Motors Ltd | Improvements in or relating to power transmissions |
US2734359A (en) * | 1956-02-14 | Flexible drive means | ||
US2738660A (en) * | 1954-04-16 | 1956-03-20 | Jack & Heintz Inc | Vibration damper |
US2749778A (en) * | 1952-03-11 | 1956-06-12 | Farrel Birmingham Co Inc | Articulated planetary gearing |
US2767658A (en) * | 1955-06-24 | 1956-10-23 | Thompson Prod Inc | Multiple unit pump having frangible shear sections |
US2772546A (en) * | 1955-08-17 | 1956-12-04 | Westinghouse Electric Corp | Flexible drive |
US2775204A (en) * | 1953-03-23 | 1956-12-25 | Roper Corp Geo D | Dual pump drive with overrunning clutches |
US2776556A (en) * | 1952-06-19 | 1957-01-08 | Volvo Ab | Devices for the transmission of power from the engine of a motor vehicle to the driven wheels thereof |
US2790311A (en) * | 1955-12-29 | 1957-04-30 | Gen Electric | Driving mechanism |
US2809503A (en) * | 1950-05-15 | 1957-10-15 | Gen Motors Corp | Gas turbine shaft |
US2822677A (en) * | 1955-12-27 | 1958-02-11 | Ingersoll Rand Co | Spring holder |
US2851892A (en) * | 1956-10-01 | 1958-09-16 | Clevite Corp | Constant speed drive system |
US2870719A (en) * | 1955-10-04 | 1959-01-27 | Thompson Prod Inc | Bushing for pressure loaded gear pump having a tapered journal surface |
US2941473A (en) * | 1955-05-17 | 1960-06-21 | Thompson Ramo Wooldridge Inc | Coupling apparatus for a multiple unit fuel pump |
US2955536A (en) * | 1955-01-20 | 1960-10-11 | Gen Motors Corp | Fuel pump |
US2955537A (en) * | 1955-11-18 | 1960-10-11 | Gen Motors Corp | Fuel pump |
-
1957
- 1957-09-04 US US682045A patent/US3037455A/en not_active Expired - Lifetime
Patent Citations (47)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2734359A (en) * | 1956-02-14 | Flexible drive means | ||
US1490219A (en) * | 1924-04-15 | Resilient driving connection | ||
US993570A (en) * | 1908-07-06 | 1911-05-30 | Westinghouse Electric & Mfg Co | Resilient driving connection. |
US1147428A (en) * | 1913-04-15 | 1915-07-20 | Alfred Peterson | Rotary motor. |
US1150441A (en) * | 1915-02-16 | 1915-08-17 | Fortunawerke Specialmaschinenfabrik G M B H | Flexible coupling. |
US1874681A (en) * | 1927-02-02 | 1932-08-30 | Packard Motor Car Co | Internal combustion engine |
US1965742A (en) * | 1931-01-21 | 1934-07-10 | Junkers Hugo | Driving mechanism for aircraft |
US2028407A (en) * | 1932-04-29 | 1936-01-21 | Moineau Rene Joseph Louis | Gear mechanism |
US2098718A (en) * | 1933-03-17 | 1937-11-09 | Gen Motors Corp | Supercharger mechanism for internal combustion engines |
FR797567A (en) * | 1934-09-19 | 1936-04-29 | Bosch Robert | Elastic drive device for auxiliary devices of automobiles or airplanes |
US2055014A (en) * | 1935-03-11 | 1936-09-22 | Farrel Birmingham Co Inc | Coupling for rotatable elements |
US2220751A (en) * | 1938-12-08 | 1940-11-05 | Gen Electric | Torsional vibration dampener |
US2331045A (en) * | 1941-05-07 | 1943-10-05 | Trico Products Corp | Pump |
US2346426A (en) * | 1941-10-30 | 1944-04-11 | Fmc Corp | Flexible rotary drive coupling |
US2460649A (en) * | 1942-03-07 | 1949-02-01 | Geza W Muiler | Gear pump with flow cushioning means |
FR898116A (en) * | 1942-05-13 | 1945-04-11 | Hermes Patentverwertungs Gmbh | Connection between hollow shaft and oscillating shaft, in particular for electrical auxiliary controls |
FR900188A (en) * | 1942-10-23 | 1945-06-21 | Graetz Ag | Improvement to rotary machines applicable as multiple circulation pumps or as motors |
US2490115A (en) * | 1942-10-28 | 1949-12-06 | Bendix Aviat Corp | Variable displacement rotary pump |
US2346432A (en) * | 1942-11-10 | 1944-04-11 | Jack & Heintz Inc | Torsional vibration damper |
US2437954A (en) * | 1943-01-30 | 1948-03-16 | Bendix Aviat Corp | Accessory drive control |
GB588303A (en) * | 1944-11-01 | 1947-05-20 | Karl Baumann | Improvements in and relating to the driving gear of reciprocating internal comustionpower plant |
US2541405A (en) * | 1946-12-18 | 1951-02-13 | Bowser Inc | Rotary hand pump |
US2487439A (en) * | 1947-02-04 | 1949-11-08 | United Aircraft Corp | Automatically variable speed scavenge pump drive |
US2513984A (en) * | 1947-11-21 | 1950-07-04 | Eaton Mfg Co | Internal gear pump |
US2698526A (en) * | 1948-04-14 | 1955-01-04 | Beier Josef | Shaffing for power transmission in motor-driven vehicles |
US2647380A (en) * | 1949-06-24 | 1953-08-04 | Bendix Aviat Corp | Flexible shaft |
FR1000903A (en) * | 1949-11-29 | 1952-02-18 | Elastic coupling device | |
US2658361A (en) * | 1950-02-02 | 1953-11-10 | Gen Electric | Driving mechanism |
US2809503A (en) * | 1950-05-15 | 1957-10-15 | Gen Motors Corp | Gas turbine shaft |
US2705459A (en) * | 1950-11-09 | 1955-04-05 | Wilsons Sons Inc William M | Pump |
US2590169A (en) * | 1951-01-31 | 1952-03-25 | Jack & Heintz Prec Ind Inc | Torsional drive shaft |
US2657632A (en) * | 1951-02-16 | 1953-11-03 | Sundstrand Machine Tool Co | Two-stage fuel unit |
US2749778A (en) * | 1952-03-11 | 1956-06-12 | Farrel Birmingham Co Inc | Articulated planetary gearing |
US2776556A (en) * | 1952-06-19 | 1957-01-08 | Volvo Ab | Devices for the transmission of power from the engine of a motor vehicle to the driven wheels thereof |
US2775204A (en) * | 1953-03-23 | 1956-12-25 | Roper Corp Geo D | Dual pump drive with overrunning clutches |
GB743564A (en) * | 1953-08-21 | 1956-01-18 | Guy Motors Ltd | Improvements in or relating to power transmissions |
US2703847A (en) * | 1953-11-24 | 1955-03-08 | Gen Electric | Driving mechanism for starter-generator |
US2738660A (en) * | 1954-04-16 | 1956-03-20 | Jack & Heintz Inc | Vibration damper |
US2955536A (en) * | 1955-01-20 | 1960-10-11 | Gen Motors Corp | Fuel pump |
US2941473A (en) * | 1955-05-17 | 1960-06-21 | Thompson Ramo Wooldridge Inc | Coupling apparatus for a multiple unit fuel pump |
US2767658A (en) * | 1955-06-24 | 1956-10-23 | Thompson Prod Inc | Multiple unit pump having frangible shear sections |
US2772546A (en) * | 1955-08-17 | 1956-12-04 | Westinghouse Electric Corp | Flexible drive |
US2870719A (en) * | 1955-10-04 | 1959-01-27 | Thompson Prod Inc | Bushing for pressure loaded gear pump having a tapered journal surface |
US2955537A (en) * | 1955-11-18 | 1960-10-11 | Gen Motors Corp | Fuel pump |
US2822677A (en) * | 1955-12-27 | 1958-02-11 | Ingersoll Rand Co | Spring holder |
US2790311A (en) * | 1955-12-29 | 1957-04-30 | Gen Electric | Driving mechanism |
US2851892A (en) * | 1956-10-01 | 1958-09-16 | Clevite Corp | Constant speed drive system |
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3370540A (en) * | 1965-12-23 | 1968-02-27 | Gen Motors Corp | Pump construction |
US4497618A (en) * | 1983-09-12 | 1985-02-05 | General Motors Corporation | Combined vacuum pump and power steering pump assembly |
US20030188414A1 (en) * | 1998-10-16 | 2003-10-09 | Mark E. Baer | Motor shaft assembly and method |
US7241117B2 (en) * | 1998-10-16 | 2007-07-10 | Shop Vac Corporation | Motor shaft assembly and method |
US6425749B1 (en) * | 1999-03-29 | 2002-07-30 | Robert Bosch Gmbh | Coupling and fuel-supply pump with coupling |
US8337169B2 (en) * | 2006-07-19 | 2012-12-25 | Knorr-Bremse Systeme Fuer Nutzfahrzeuge Gmbh | System with a compressor and with a consumer in a motor vehicle |
US20090120405A1 (en) * | 2006-07-19 | 2009-05-14 | Knorr-Bremse Systeme Fuer Nutzfahrzeuge Gmbh | System with a Compressor and with a Consumer in a Motor Vehicle |
US20110116944A1 (en) * | 2009-05-08 | 2011-05-19 | Vanair Manufacturing, Inc. | Integrated compressor and pump unit and vehicles equipped therewith |
US8435011B2 (en) * | 2009-05-08 | 2013-05-07 | Vanair Manufacturing Inc. | Integrated compressor and pump unit and vehicles equipped therewith |
US20130022485A1 (en) * | 2011-07-19 | 2013-01-24 | Slw Automotive Inc. | Unified variable displacement oil pump and vacuum pump |
US8961148B2 (en) * | 2011-07-19 | 2015-02-24 | Douglas G. Hunter | Unified variable displacement oil pump and vacuum pump |
US10137222B2 (en) | 2015-03-27 | 2018-11-27 | 3M Innovative Properties Company | Fibrin composition, method and wound articles |
US10940233B2 (en) | 2016-10-05 | 2021-03-09 | 3M Innovative Properties Company | Fibrinogen composition, method and wound articles |
US11827754B2 (en) | 2016-10-05 | 2023-11-28 | 3M Innovative Properties Company | Fibrin composition comprising carrier material, method and wound articles |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US3037455A (en) | Pumps | |
US4596519A (en) | Gear rotor fuel pump | |
US4540354A (en) | Rotary fuel pump | |
KR900001296B1 (en) | Scroll compressor | |
US2490115A (en) | Variable displacement rotary pump | |
US4336002A (en) | Two stage pump having an electromotor device | |
US3282222A (en) | Rotating vane machines | |
KR920701684A (en) | Shroul Compressor | |
US4571160A (en) | Diaphragm pump having a flat plate actuating member slidable in slots | |
US4758141A (en) | Vane pump with flexible tongue valve | |
US2688925A (en) | Mixed flow multiple pump | |
US4295807A (en) | Internal combustion engine with oil pump gear surrounding and driven by crankshaft | |
US5407327A (en) | Vane cell pump | |
US3614266A (en) | Compact positive displacement pump | |
US2383153A (en) | Sealing device for internal gear pumps | |
US2332411A (en) | Pump | |
US2037894A (en) | Fuel pump | |
US3752601A (en) | High pressure liquid pump | |
US2884865A (en) | Power transmission | |
US2462931A (en) | Pump for hydraulic pitch changing mechanisms | |
KR900003537A (en) | Hydraulic pump and motor assembly of automotive hydraulic equipment | |
WO2005103488A2 (en) | Device for controlling parasitic losses in a fluid pump | |
US2390043A (en) | Control apparatus | |
US3841803A (en) | Rotary engine oil metering pump | |
US4566870A (en) | Adjustable vane-type pump |