US3388670A

US3388670A - Pump

Info

Publication number: US3388670A
Application number: US580087A
Authority: US
Inventors: La Vern R Connelly
Original assignee: Eaton Yale and Towne Inc
Current assignee: Eaton Corp
Priority date: 1966-09-16
Filing date: 1966-09-16
Publication date: 1968-06-18
Anticipated expiration: 1985-06-18
Also published as: DK127020B; DE1625737B1; SE319939B; GB1180038A; NO119339B; ES345454A1; CH458848A

Description

J1me 1968 LA VERN R. CONNELLY 3,388,670

PUMP

Filed Sept. 16, 1966 FIG! /NVENTOR 5 M 3 WW T w wn R m V A L United States Patent 3,388,670 PUMP La Vern R. Connelly, Marshall, Mich., assignor to Eaton Yale & Towne Inc., Cleveland, Ohio, a corporation of Ohio Filed Sept. 16, 1966, Ser. No. 580,087 Claims. (Cl. 103-205) The Present invention relates generally to an apparatus including a pair of drive transmitting members one of which is drivingly received in an opening in the other and particularly relates to a pump apparatus having a rotatable drive shaft which is drivingly secured in an opening in a drive member which is rotatable to effect rotation of the drive shaft.

The preferred embodiment of the present invention to be described herein relates to a rotary pump. The rotary pump has a housing supporting a pumping rotor means which is driven by a tubular or hollow shaft. Rotation of the pumping rotor means by the hollow shaft effects pumping of a fluid from the pump inlet to the pump outlet. The pump is constructed so that the hollow dri-ving shaft is utilized as a flow passage for a portion of the circulating fluid and is rotated to drive the pumping rotor means by a drive transmitting member which has an opening therein in which the shaft is drivingly received.

An object of the present invention is the provision of a new and improved apparatus wherein a first drive member drivin-gly connected with a mechanism is received in an opening in a second drive member and drivingly secured therein due to apparatus which effects tight engagement therebetween and wherein the tight engagement is provided by an insert member which is forcibly engaged in an opening in the first member and effects expansion of the first member into tight engagement with the second member.

Yet another object of the present invention is the provision of a new and improved apparatus, as set forth above, wherein the opening in the first drive member includes an enlarged portion having a larger diametrical extent than the diametrical extent of the insert member to permit relaxation of the first drive member upon movement of the insert member into the enlarged portion so that the second drive member may be removed from the first.

A still further object of the present invention is the provision of a new and improved pump including a driving shaft effective to drive a pumping means and wherein the driving shaft includes an opening therein forming a flow passageway for circulating fluid upon operation of the pumping means, and wherein the shaft is drivingly connected to a drive transmitting element by an insert member which is forced into the opening in the shaft to expand the shaft into engagement with the drive transmitting element and which closes the opening against leakage of the circulating fluid therefrom.

A further object of the present invention is the provision of a new and improved method of releasably securing a first drive member on the pump head of a second drive member which includes expanding the second drive member into tight engagement with the first drive member by forcing an insert into an opening in the second drive member and providing for removal of the first drive member by further movement of the insert into the opening in the second drive member.

Other objects and advantages of the present invention will be apparent from the detailed description thereof made with reference to the accompanying drawings which form a part of the specification and in which:

FIG. 1 is a sectional View of an apparatus embodying the present invention, with portions thereof in elevation;

FIG. 2 is a fragmentary sectional view of a portion of 3,383,670 Patented June 18, 1968 "ice the apparatus shown in FIG. 1 on an enlarged scale; and

FIG. 3 is a sectional view of the apparatus shown in FIG. 1 taken approximately along section line 3-3 of FIG. 1.

The present invention provides an improved apparatus including a pair of drive transmitting members one of which is drivingly received in an opening in the other and particularly provides an improved manner of drivingly connecting such members. The invention may be embodied in different apparatuses which have a wide variety of applications. As representing the preferred embodiment of the present invention, a pump 10 is illustrated in the drawings. The pump 10 is adapted to be used in a hydraulic power steering system of an auto motive vehicle or the like and is driven from the engine of the vehicle. However, it will be apparent that a pump embodying the invention is suitable for use in applications other than automotive power steering systems.

The pump 10 includes a housing 11 containing a rotary pumping means 12 secured to a driving shaft 13 for rotation therewith. A drive transmitting element 14 is secured to the driving shaft 13 by means which will be more fully described hereinafter and effects rotation of the shaft 13 upon rotation thereof. The driving element 14, which is here shown as a pulley, is driven by an associated power means, such as an engine of the automotive vehicle, not shown, in which the pump is used.

The rotary pumping means 12 may be of any suitable construction but as shown includes a rotor member or carrier 20 which is suitably connected to the shaft 13 for rotation therewith. The rotor or carrier member 20 is a generally annular member and includes a plurality of radial slots therein. The slots are spaced circumferentially about the rotor member and carry pumping elements which, in the preferred embodiment, are cylindrical roll members 21. Upon rotation of the rotor or carrier member 29, the rolls 21 contact an arcuate cam surface 22 of a cam member 23 which is located radially outwardly of the rotor or carrier member 20 and fixed in the housing 11. The cam surface 22 is so configured that as the rotor or carrier member 20 rotates, the rolls 21 move radially inwardly and outwardly thereof and pumping is accomplished in a well-known manner. The cam surface 22 may be shaped so as to provide for a single or plurality of pumping strokes of the rolls 21 for each revolution of the rotor or carrier member 20. As shown in FIG. 3, two pumping strokes are provided for each revolution of the rotor or carrier 20.

The rotor 20 and the cam member 23 are disposed closely adjacent a cov r member 25 which is fixed in the housing 11. The cover member 25 supports suitable bearing means 25, in the form of a bushing, and which supports the shaft 13 for rotation relative to the cover member 25. The cover member 25 additionally includes fiuid passageways which provide the inlet and

discharge passages

27, 28, respectively, for the pump 10.

An end plate 30 is positioned closely adjac nt the rotor or carrier 20 and the cam member 23 at the side thereof opposite to the cover 25 and is held closely adjacent the end of a cam member 23 and in registry therewith by means of suitable screws 31, which extend through holes in the end plate 30 and the cam member 23, and are threadedly engaged with the cover 25. The end plate 30, cam member 23 and cover member 25 are located radially with respect to each other by a locating pin 32, which extends into suitable holes in the end plate 30, cam member 23, and the cover 25. In the illustrated embodiment, the subassembly formed by the end plate 30, the cover 25 and the cam member 23 is pressed into the housing 11 and is thereby fixed against rotation relative to the housing. The shaft 13 is supported by a suitable bearing 36 carried by the end plate 30 and which permits rotation of the shaft 13 relative to the end plate 30.

The end plate 30 is maintained in sealing engagement between the housing 11 and the shaft 13 by means of an O-ring type seal 33 which encircles an outer periphery of the end plate 30 and sealingly engages a flange 34 of the housing 11. The end plate 30 additionally carries a cartridge-type lip seal 35 at its outer end which is effective to form a seal between the end plate 30 and the shaft 13.

The end plate 30 includes grooves or fluid chambers 40, 41 which are formed in an annular surface 42 of the end plate 30 and are located adjacent the intake of the rotary pumping means 12 and form intake chambers. The grooves 40, 41 communicate with an area adjacent the seal 35 by means of passages 45, 46. The passage 46 communicates directly with the groove 41 while passage 45 communicates with passage 46 and groove 40. Additionally, the surface 42 of the end plate 30 includes grooves or passageways 47, 48 which communicate with the discharge passage 28 in the cover 25.

The shaft 13 is a tubular shaft and includes a central passageway 49 extending therethrough and which communicates with the seal 35 and the grooves 40, 41v in the end plate 30 by means of ports 50. The ports 50 extend from the passageway 49 to the outer periphery of the shaft adjacent the seal 35 and communicate with the passage 46. The shaft passageway 49 at the end thereof designated 49a communicates with the pump inlet passage or chamber 27.

From the above, the flow or fluid through the pump upon operation thereof should be apparent. The fluid flows into the pump inlet chamber 27 and into the rotor 26 from the opposite sides thereof. The fluid flows from chamber 27 directly into the rotor on the right side thereof, as viewed in the drawings. The fluid flows to the left side of the rotor 20, as viewed in the drawings, through shaft passageway 49, radial openings 50, and passageways 46, 45 to the inlet grooves 40, 41. Fluid also flows to groove 40 through passage 40a in cam 23. The fluid is discharged from the rotor on the right side thereof, as viewed in the drawings, directly into the discharge chamber 28 and from the left side of the rotor into chamber 47 and passage 48. Passage 48 communicates with the discharge chamber 28 through opening 48a in the cam member 23.

As shown in FIG. 2, the drive transmitting element 14 is a pulley having a central hub portion 60, and a web portion 61, having a belt engaginge V-groove 62 formed at its outer periphery. Although the drive transmitting element is illustrated and described as a pulley, it should be apparent that any suitable form of drive transmitting element may be used. In accordance with the present invention, the pulley 14 is drivingly connected to the outer periphery of the shaft 13. The driving connection is effected by an expanded portion of the shaft 13 which is received in an opening in the pulley hub and in tight engagement with the hub 60. p

The tight engagement is provided by an insert member 65 which is forcibly engaged in an opening 66 at the end of the shaft member 13, which opening communicates with the passageway 49. Prior to assembly of the drive transmitting element 14 on the shaft 13, the inner diameter of the hub portion 60 and the outer diameter of the shaft 13 are of such size that the drive transmit ting element 14 may be slipped onto the end of the shaft 13. The insert member 65 has a diametrical interference with opening 66, that is, the diameter thereof is greater than the diametrical extent of the opening 66 in the shaft 13, so that when the insert member is forcibly pressed into the opening 66, the Walls of the hollow shaft 13 are urged outwardly or expanded into tight engagement with the inner periphery of the hub portion 60 of the pulley 14. Because of the expansion of the end of the shaft into engagement with the inner periphery of the hub 60, the drive transmitting element 14 is drivingly connected to the shaft 13. The shaft, of course, is sufficiently yielclable so as to be expanded by the insert member 65.

As shown in FIG. 2, the insert member 65 is a spherical member and the opening 66 is circular. When the insert member 65 is secured in the opening 66, fluid in the central flow passage 49 of the shaft 13 is prevented from leaking past the insert member and out of the open end of the shaft, by the fluid tight engagement of the insert member 60 and the wall of the shaft 13 defining the opening in which the spherical member is received. Thus, the insert member 65 functions as a fluid seal as well as securing the pulley 14 on the shaft 13. While the insert member 65 is preferably spherical and the opening 66 circular, other geometrical configurations of these elements could be used.

In the event that the drive transmitting element 14 is to be removed from the shaft 13, the insert member 65 is pressed into the shaft in a direction toward the end plate 30 and into the flow passage 49 which is of larger diametrical extent than the opening 66. The passage 49 is preferably of larger diametrical extent than the insert member 65 so that the insert member 65 is freely movable into the passage 49, as shown in dotted lines in FIG. 2. When the insert member 65 is moved into the passage 49, the end of the shaft upon which the drive transmitting element 14 is mounted relaxes and the drive pulley 14 may be removed therefrom. The same or a different pulley 14 may be positioned on the shaft 13 by slipping the pulley on the shaft 13 and pressing an additional insert into the opening 66 as described. The illustrated embodiment of the invention includes means for preventing the insert member 65 which has been pressed into the passageway 49 from interfering with fluid flow through the ports 50. As illustrated, the shaft 13 includes an annular shoul der 70 extending into the passageway 49 at a position intermediate the ports 50 and the opening 66 and which has a diametrical extent which is smaller than that of the insert member 65. When the insert member 65 has been pressed into the passageway 49, it is loosely received therein but cannot move past the shoulder 70 toward the ports 50 due to interference with the shoulder 70. While the provision of the shoulder 70 is illustrated in the pre ferred embodiment, it should be apparent that different structure may be provided to prevent the member 65 from blocking the ports 50.

It can be seen now that a new and improved apparatus has been provided which is effective to drivingly connect one drive member in an opening in another in an uncomplicated and inexpensive manner. It is further apparent that the pump apparatus embodying the present invention utilizes an insert which is effective to sealingly close an open end of a tubular drive shaft permitting the tubular shaft to be utilized as a flow passageway for fluid.

While a preferred embodiment of the present invention has been described and illustrated herein in considerable detail, the present invention is not intended to be limited to the precise construction disclosed. It is intended to cover hereby all adaptations, modifications, and uses of this present invention which come within the scope of the appended claims.

Having described my invention, I claim:

1. An apparatus comprising pumping means, shaft means for driving said pumping means, a drive transmitting member having an opening defined by an inner surface surrounding an end portion of said shaft means and drivingly connected therewith to effect rotation of said shaft means upon rotation of said member, said shaft means having an opening in said end portion, and means providing said driving connection between said shaft means and said drive transmitting member including a member located in said opening and expanding the outer periphery of said shaft means into tight engagement with said inner surface of said drive transmitting member to effect said driving connection therebetween.

2. An apparatus as defined in claim 1 wherein said opening is centrally located in said shaft and extends axially thereof and communicates with a passageway for fiuid circulating in said pump, and said member having an outer surface portion in sealing engagement with said inner surface to block leakage of said fluid from said opening.

3. An apparatus as defined in claim 1 and wherein said member is interferingly engaged in an opening in said shaft means to effect said expansion of said shaft means.

4. An apparatus as defined in claim 1 wherein said opening includes an enlarged portion adjacent said memher, said enlarged portion freely receiving said member upon movement thereof into said portion, and said end of said shaft relaxing upon movement of said member into said portion thereby providing for removal of said drive transmitting member from said shaft means.

5. An apparatus as defined in claim 4 wherein said member is a spherical member and said opening is circular, said member having a diameter greater than the diameter of said opening prior to insertion into said opening.

6. An apparatus comprising a first driving member, a second driven member, one of said members including a continuous outer periphery adjacent an end thereof and received in an opening in the other member, said opening being defined by an inner peripheral surface of said other member, said one member having an opening therein in said end thereof, insert means in said opening in said one member urging said periphery of said one member radially into tight driving engagement with said inner peripheral surface of said other member to drivingly connect said members, and means other than said insert means drivingly connected with said one member.

7. An apparatus as defined in claim 6 wherein said insert member includes a peripheral surface portion which tightly engaged with said inner peripheral surface of said one member continuously therearound.

8. An apparatus as defined in claim ,6 wherein said opening in said one member communicates with an enlarged passage portion adjacent thereto, said enlarged portion having a diametrical extent which is larger than the diametrical extent of said insert member so as to freely receive said insert member.

9. An apparatus comprising first and second drive transmitting members, one of said members having an end portion received in an opening in the other member, said opening being defined by an inner peripheral surface of said other member, said one member having an opening therein in said end portion thereof, said opening in said one member communicating with an enlarged passage portion adjacent thereto, and insert means in said opening in said one member urging the periphery of said end portion of said one member radially into tight driving engagement with said inner peripheral surface of said other member to drivingly connect said members and movable into said enlarged portion to permit reiaxation of said end portion and removal of said other member therefrom.

10. A method of forming a drive connection between a first member having an opening in an end thereof which communicates with an enlarged passage portion and a second member having an opening receiving the end of said first member comprising the steps of providing an insert member having a diametrical extent larger than the diametrical extent of said opening in said first member but less than the diametrical extent of said enlarged passage portion, forcing said insert member into said opening, expanding the periphery of said end of said first member into driving engagement with the inner surface of said second member defining the opening therein by said forcing, and forcing said insert member from said opening into said enlarged passage portion of said first member thereby relaxing said periphery of said first member and permitting removal of said second member from said first member.

References Cited ROBERT M. WALKER, Primary Examiner.

Claims

1. AN APPARATUS COMPRISING PUMPING MEANS, SHAFT MEANS FOR DRIVING SAID PUMPING MEANS, DRIVE TRANSMITTING MEMBER HAVING AN OPENING DEFINED BY AN INNER SURFACE SURROUNDING AN END PORTION OF SAID SHAFT MEANS AND DRIVINGLY CONNECTED THEREWITH TO EFFECT ROTATION OF SAID SHAFT MEANS UPON ROTATION OF SAID MEMBER, SAID SHAFT MEANS HAVING AN OPENING IN SAID END PORTION, AND MEANS PROVIDING SAID DRIVING CONNECTION BETWEEN SAID SHAFT MEANS AND SAID DRIVE TRANSMITTING MEMBER INCLUDING A MEMBER LOCATED IN SAID OPENING AND EXPANDING THE OUTER PERIPHERY OF SAID SHAFT MEANS INTO TIGHT ENGAGEMENT WITH SAID INNER SURFACE OF SAID DRIVE TRANSMITTING MEMBER TO EFFECT SAID DRIVING CONNECTION THEREBETWEEN.