US3791149A - Rotary eccentric fluid motor - Google Patents

Rotary eccentric fluid motor Download PDF

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Publication number
US3791149A
US3791149A US00270777A US3791149DA US3791149A US 3791149 A US3791149 A US 3791149A US 00270777 A US00270777 A US 00270777A US 3791149D A US3791149D A US 3791149DA US 3791149 A US3791149 A US 3791149A
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US
United States
Prior art keywords
fluid
gear member
housing
chamber
outer gear
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
Application number
US00270777A
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English (en)
Inventor
G Strecker
D Schultz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Gardner Denver Inc
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Gardner Denver Inc
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Filing date
Publication date
Application filed by Gardner Denver Inc filed Critical Gardner Denver Inc
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Publication of US3791149A publication Critical patent/US3791149A/en
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Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D9/00—Portable percussive tools with fluid-pressure drive, i.e. driven directly by fluids, e.g. having several percussive tool bits operated simultaneously
    • B25D9/06—Means for driving the impulse member
    • B25D9/12—Means for driving the impulse member comprising a built-in liquid motor, i.e. the tool being driven by hydraulic pressure
    • 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
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/10—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
    • F04C2/102—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member the two members rotating simultaneously around their respective axes

Definitions

  • Fluid pumps and motors of the so-called internal gear type are well known and are generally characterized by an inner gear member having a plurality of external teeth which cooperate with an outer gear member having internal teeth to form expansible chambers.
  • the internal gear is usually formed with one less tooth than the outer gear member and the centers or axes of the tooth outlines of the respective members are spaced apart and parallel.
  • Various arrangements of mounting the inner and outer gear members are known to provide for rotary or orbital movement of one or both members; however, for application as motors such devices are usually arranged to provide for the inner gear to be mounted on a rotatable shaft which may rotate about a fixed axis.
  • Internal gear type motors are also known in which the inner gear moves in an orbital manner as well as rotating about its own center axis.
  • the present invention provides for a fluid motor of the internal gear type wherein an inner gear member having a plurality of external teeth is fixedly mounted so that a cooperating outer gear member responds to the introduction of pressure fluid admitted to expansible chambers formed by the cooperating gear teeth to orbit about the inner gear member to thereby produce rotary motion.
  • the outer gear member is mounted in a housing which includes bearing means for supporting the outer gear member and which is mounted for rotation in response to orbital movement of the outer gear member.
  • the present invention further provides for an improved hydraulic percussion tool characterized by a piston which is reciprocably driven by an internal gear type motor having an eccentric formed by a rotating motor housing.
  • an improved internal gear type fluid motor having a fixed inner gear is operable to directly drive a reciprocable fluid displacing piston by an eccentric formed by the motor housing itself. Accordingly, a compact and positive drive mechanism is thereby provided.
  • the hydraulic percussion tool of the present invention advantageously utilizes hydraulic fluid from a common source for driving the internal gear motor and the hydraulic percussion mechanism.
  • the hydraulic percussion tool according to the present invention is more compact and reliable than heretofore known devices of the general type disclosed.
  • the percussion mechanism of the apparatus formed by the pistons 32 and 44 and their associated cylinders is essentially of the same type as disclosed in US Pat. No. 3,140,586 to K.E.A. Joelson and reference may be had to the Joelson patent for a description of the general operation of the mechanism and of the advantages thereof.
  • the gear 92 is disposed within a bearing means comprising a cylindrical bore 100 formed in a motor housing member 102.
  • the housing member 102 includes an outer circular cam surface 104 engaged with the surface 40 of the valve member 36, the latter acting as a cam follower.
  • the center axis of the cam surface 104 is located at 106, FIG. 2.
  • Holes 103 are formed in the housing member 102 to reduce the effect of centrifugal forces. These holes may be eliminated for certain applications where unbalanced forces maybe desirably utilized.
  • the motor housing member 102 is disposed between two opposed end plates 108 and 110 which respectively include integral stub shaft portions 112 and 114.
  • the end plates 108 and 110 which form end walls for closing the axially open ended chambers 98 and 99, are fastened together and to the housing member 102 by suitable screw type fasteners 116.
  • the shaft portions 112 and 114 are rotatably mounted in bearings 118, disposed in the cover member 74 and the casing 72, and surround the stationary shaft 76.
  • the motor housing formed by the members 102, 108, and 110 is rotatable about an axis which is coincident with the center axis 90 of the gear 84 and the shaft 76.
  • the housing members 108 and 110 could also be rotatably supported by the shaft 76.
  • the orbital motion of the gear 92 due to a pressure fluid medium such as hydraulic fluid interacting between the teeth of the gears forces the motor housing to rotate due to the fact that the center of the bore which is the center 94 is. eccentric or spaced from the axis of rotation 90 of the housing.
  • the movement of the housing member 102 to make one revolution for one orbit of the gear 92 about the gear 84 provides for continuous maintenance of the proper position of the ports 124 and 126 with respect to the moving expansible chambers 98 and 99 formed between the gears.
  • the gear 92 also rotates with respect to the gear 84 and in one orbit makes a fraction of a revolution which is in the inverse proportion to the number of teeth in the gear 92.
  • seven orbits result in one revolution and accordingly the gear 92 and the housing member 102 rotate relative to each other.
  • the arrangement of the motor 70 which provides for rotation of the housing member 102, constructed to have the eccentric cam surface 104, results in superior drive means for the percussion mechanism of the apparatus 10.
  • the arrangement of the motor 70 to provide for rotation of the motor housing means comprising the members 102, 108, and 110 results in an eccentric member which has a substantial rotational moment of inertia and thereby acts as a good flywheel.
  • a pressure fluid medium such as hydraulic fluid is supplied to the motor from a suitable source, not shown, through the port 82.
  • Fluid discharged from the motor through passages 132 fills the interior chamber 27 to lubricate the bearings 118 and the cam surfaces 40 and 104. Fluid from the interior of the casing 72 is also admitted into the bore 26 of the percussion mechanism when the valve member 36 opens as shown by the positions of FIGS. 5 and 6. Excess fluid discharged from the motor 70 and not required by the percussion mechanism may be conducted through passages 137 into chamber and out of the apparatus 10 through port 138 along with fluid expelled from the chamber 28 through passages 30.
  • the operation of the apparatus 10 is made possible by the introduction of high pressure fluid to the inlet port 82 whence fluid flows to the port 124 in the plate 108 by way of passages 80, 122, 120 and 128.
  • the gear 92 will react to pressure fluid in the chambers formed between the gears 84 and 92 and in communication with port 124 to move its center 94 in an orbit about the axis 90 in the direction of the arrow 140.
  • the orbital movement of the gear 92 will cause the rotation of the motor housing member 102 about the axis 90 also in the direction of the arrow 140.
  • valve member 36 will move the valve member 36 to open with respect to the drive piston 32 whereby pressure fluid may begin to flow into the bore 26 from the interior chamber 27 of the casing 72.
  • the valve member 36 remains open with respect to the piston 32 and the spring 34 engages the piston to move it to its extreme uppermost position as fluid from the interior of casing 72 fills the bores 26 and 28 and the impact piston 44 is biased into is uppermost position toward the flanged end portion 22.
  • the operating cycle described above is repeated continuously and smoothly thanks partly to the large rotational mass moment of inertia of the motor housing comprising the member 102, 108 and 110. Moreover, a smooth and continuous flow of fluid through the motor and into the'chambers 27 and 15 is provided for use by the percussion mechanism and to cool and lubricate the motor.
  • an impact piston having a portion reciprocably disposed in said second cylinder and movable in response to the displacement of fluid from said first cylinder to said second cylinder by said drive piston;
  • a fluid operated motor including housing means mounted on said apparatus for rotation about an axis, a shaft mounted stationary on said apparatus, an inner gear member mounted stationary on said shaft and having a plurality of radially projecting external lobes and an outer gear member having a plurality of inwardly projecting internal lobes engaged with said external lobes to form expansible chamber means, said outer gear member being disposed for orbital movement about said inner gear member in response to the admission of pressure fluid to said expansible chamber means, said outer gear member being engaged with said housing means for rotating said housing means in response to said orbital movement of said outer gear memher, and said housing means including a cam surface engageable with said drive piston for operating said drive piston to displace fluid from said first cylinder in response to the rotation of said housing means.
  • said outer gear member includes a cylindrical outer circumference and said outer gear member is supported in bearing means in said housing means comprising a cylindrical bore in said housing means, said cylindrical bore having a center axis which is eccentric to the axis of rotation of said housing means.
  • said apparatus includes a casing forming an interior chamber, said chamber being in communication with said means for admitting pressure fluid to said first cylinder, and said housing means includes a fluid inlet port and a fluid discharge port, said discharge port being in communication with said chamber for discharging fluid from said motor to said chamber.
  • said motor is mounted in said chamber in said casing, said casing including bearing means for supporting said housing means for rotation in said casing in response to the orbital movement of said outer gear member.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Hydraulic Motors (AREA)
  • Rotary Pumps (AREA)
US00270777A 1972-07-11 1972-07-11 Rotary eccentric fluid motor Expired - Lifetime US3791149A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US27077772A 1972-07-11 1972-07-11

Publications (1)

Publication Number Publication Date
US3791149A true US3791149A (en) 1974-02-12

Family

ID=23032763

Family Applications (1)

Application Number Title Priority Date Filing Date
US00270777A Expired - Lifetime US3791149A (en) 1972-07-11 1972-07-11 Rotary eccentric fluid motor

Country Status (8)

Country Link
US (1) US3791149A (fr)
JP (1) JPS5420036B2 (fr)
AU (1) AU5133273A (fr)
CA (1) CA966744A (fr)
FR (1) FR2192615A5 (fr)
GB (1) GB1387381A (fr)
SE (1) SE379829B (fr)
ZA (1) ZA73353B (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4102534A (en) * 1977-01-10 1978-07-25 Ajax Tool Works, Inc. Pneumatic hammer
US6082986A (en) * 1998-08-19 2000-07-04 Cooper Technologies Reversible double-throw air motor
EP1027963A2 (fr) * 1999-02-09 2000-08-16 Black & Decker Inc. Perceuse a percussion
US6241500B1 (en) 2000-03-23 2001-06-05 Cooper Brands, Inc. Double-throw air motor with reverse feature
US20110139478A1 (en) * 2009-12-15 2011-06-16 Jens Brennenstuhl Hand-held power tool
US8733610B2 (en) * 2012-08-21 2014-05-27 Tricord Solutions, Inc. Fastener driving apparatus

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5990788A (ja) * 1982-11-16 1984-05-25 Sumitomo Electric Ind Ltd 回転ポンプ

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3112677A (en) * 1962-02-09 1963-12-03 Hartmann Mfg Company Hydrodynamic unit
US3140586A (en) * 1960-09-19 1964-07-14 Joelson Karl-Evert Anders Hydraulically operated apparatus
US3215043A (en) * 1962-08-30 1965-11-02 Mortimer J Huber Hydraulic torque motors
US3250335A (en) * 1963-08-21 1966-05-10 Joelson Karl Evert Anders Device for use in percussion mechanisms
US3322103A (en) * 1964-06-13 1967-05-30 Dirnberger Georg Rotary piston engines
US3453966A (en) * 1967-05-04 1969-07-08 Reliance Electric & Eng Co Hydraulic motor or pump device
US3574490A (en) * 1969-05-21 1971-04-13 Koehring Co Fluid pump or motor having rollers

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3140586A (en) * 1960-09-19 1964-07-14 Joelson Karl-Evert Anders Hydraulically operated apparatus
US3112677A (en) * 1962-02-09 1963-12-03 Hartmann Mfg Company Hydrodynamic unit
US3215043A (en) * 1962-08-30 1965-11-02 Mortimer J Huber Hydraulic torque motors
US3250335A (en) * 1963-08-21 1966-05-10 Joelson Karl Evert Anders Device for use in percussion mechanisms
US3322103A (en) * 1964-06-13 1967-05-30 Dirnberger Georg Rotary piston engines
US3453966A (en) * 1967-05-04 1969-07-08 Reliance Electric & Eng Co Hydraulic motor or pump device
US3574490A (en) * 1969-05-21 1971-04-13 Koehring Co Fluid pump or motor having rollers

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4102534A (en) * 1977-01-10 1978-07-25 Ajax Tool Works, Inc. Pneumatic hammer
US6082986A (en) * 1998-08-19 2000-07-04 Cooper Technologies Reversible double-throw air motor
US6217306B1 (en) 1998-08-19 2001-04-17 Cooper Technologies Company Reversible double-throw air motor
EP1027963A2 (fr) * 1999-02-09 2000-08-16 Black & Decker Inc. Perceuse a percussion
US6237699B1 (en) * 1999-02-09 2001-05-29 Black & Decker Inc. Rotary hammer
EP1027963A3 (fr) * 1999-02-09 2003-03-26 Black & Decker Inc. Perceuse a percussion
US6241500B1 (en) 2000-03-23 2001-06-05 Cooper Brands, Inc. Double-throw air motor with reverse feature
US20110139478A1 (en) * 2009-12-15 2011-06-16 Jens Brennenstuhl Hand-held power tool
US8857536B2 (en) * 2009-12-15 2014-10-14 Robert Bosch Gmbh Hand-held power tool
US8733610B2 (en) * 2012-08-21 2014-05-27 Tricord Solutions, Inc. Fastener driving apparatus

Also Published As

Publication number Publication date
ZA73353B (en) 1973-11-28
SE379829B (fr) 1975-10-20
GB1387381A (en) 1975-03-19
JPS4957236A (fr) 1974-06-04
JPS5420036B2 (fr) 1979-07-19
FR2192615A5 (fr) 1974-02-08
AU5133273A (en) 1974-07-25
CA966744A (en) 1975-04-29

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