US2895427A

US2895427A - Power transmission

Info

Publication number: US2895427A
Application number: US413359A
Authority: US
Inventors: George A Hudson
Original assignee: Vickers Inc
Current assignee: Vickers Inc
Priority date: 1954-03-01
Filing date: 1954-03-01
Publication date: 1959-07-21
Anticipated expiration: 1976-07-21

Description

July 21, 1959 A. HUDSON POWER TRANSMISSION Filed March 1, 1954 l 5o| 68 I 7O 0 O a ,4 I 14 Q 0 a2 x I 201 p29 22 96 (2a a 6 9 I6 66 62 S 7 so 4 4 47 I 8 4 2 O 82 76 92 8 74 52 FT] P INVENTOR.

V GEORGE A. HUDSON ATTORNEY 3 United States Patent C) 2,895,427 i owER TRANSMISSION George A. Hudson, Berkley, Mieh., assignpr to Vickers Incorporated, Detroit; Mich., a corporation of Michigan Application March 1, 1954, Serial No. 413,359

7 Claims. (Cl. 103-218 it has been customary to provide mounting means for the pump completely within the tank and to have the plumbing from the discharge side of the pump and return from the system projecting through the side wall of the tank. In structures of this type it has been diflicult to seal the plumbing extending through the side wall of the tank which is essential to prevent the fluid in the tank from leaking therefrom and diminishing the proper reserve supply of fluid and in addition to prevent dirt and foreign matter entering the tank and contaminating the fluid supply. This type of structure has also created assembly and maintenance problems because the pump first has to be fastened to mounting structure, the plumbing connected and then the top fastened to the tank. When the pump has to be serviced even for the replacement of a seal it is first necessary to remove the top from the tank and then to unloosen the pump from its mounting structure within the tank. In addition plumbing lines within the tank have to be disconnected fromthe pump.

; not shown, in a pressure plate 41.

2,895,427 Patented July 21, 1959 2 structure to be explained in order to provide a pump and tank unit substantially of the form illustrated.

The housihg of the pump 12 is in three sections comprising a main body portion 14, a center ring section 16 and an end cover section 18. The main body portion is formed with an inlet passage 20 having branches 22 and 24 leading to diametrically opposed inlet fluid Zones, not shown. A rotor 26 provided with a plurality of sliding vanes 28 is mounted within the ring 16, the inner surface of the ring indicated by the numeral 30 forming a vane track of substantially elliptical contour to form pressure and suction working ramps for the vanes. The rotor is driven by a shaft 32 having external splines 34 on the inner end thereof mating with internal splines 36 of the rotor. The shaft is rotatably mounted at the 0pposite end in bearings 38 mounted in the body section 14 and is provided with a rotary shaft seal 40 in the same section adjoining the bearings 38.

The vanes as they pass through the pressure ramp are adapted to discharge fluid through two diametrically opposed fluid outlet zones mating with outlet porting, The outlet porting extends through the pressure plate to a pressure chamber 42 formed in the end cover 18. One side of the pressure plate 41 indicated by the numeral 44 is adapted to be maintained against the ring and in sealing engagement with the rotor by means of pressure fluid delivered to the pressure chamber 42 through the outlet porting extending through the plate and which acts against the opposing surface of the pressure plate indicated by the numeral 46. Passages 47 in the pressure plate 41 connect the pressure chamber 42 to the inner ends of vane slots 49 for the pur pose of maintaining outlet pressure at the inner ends of the vanes to maintain the outer ends of the vanes in contact with the vane track. A spring 48 abutting the inner side of the end cover 18 and the pressure plate 41 maintains the plate in proper sealing relation with the ring and rotor at starting and at extremely low pressures. The shaft 32 is splined at the end thereof extending from the housing 14 and indicated by the numeral 50 for driving connection, for example, with the power take-off means of a vehicle such as a tractor.

It is therefore a general object of this invention to pro It is a further object of this iuventiorito provide a power unit comprising a fluid supply tank and fluid pump which alleviates the recited problems and. diflicultiesinvolved with priorforms of suchunits,

It is still another object to provide an improved fluid supply tank and pump power unit which is low in cost, which simplifies assembly and maintenance, and which is eflicient over a long and useful life.

Further objects and advantages of the present invention will be apparent from the following description, reference being had to the accompanying drawing wherein a preferred form of the present invention is clearly shown.

In the drawingi v.

Figure l is a top view partly in section of a fluid pump and tank unit embodying a preferred form of the present invention.

Figure 2 is a side elevation view of the pump and tank unit shown in Figure 1 Referring to Figures 1 and 2 there is shown a fluid tank indicated generally by the numeral 10 within which is a rotary vane pump indicated by the numeral 12. The interior Working members of the pump are substantially of the type disclosed in the "patent to Gardiner, No. 2,544,988, although it should be understood that other forms of pumps may be utilized providing that'the housing therefor is constructed to cooperate with"the"tank The tank 10 is provided with a top cover 52 which may be suitably fastened by screws indicated by the numeral 54. A filler cap assembly indicated generally by the numeral 56 is provided for a filler pipe 58 on the cover 52 leading to the interior of tank 18.

Two opposing sidewalls 60 and 62 of the tank 10 are respectively constructed with oppositely arranged 0penings 64 and 66 in which the pump housing may be mounted. The pump housing is formed with a hub 68 at the shaft end thereof which is mounted in the opening 64 thereby closing the same and with the shaft 32 extending from the opening. The hub 68 may be provided with a groove 70 in which an O-ring 72 is mounted for proper sealing between the hub and opening 64. The end cover 18 of the pump 12 is formed with an outwardly extendindicated by the numeral is adapted to be mounted within the opening 66. A gasket 82 may be utilized between the flange 74 and the outer surface 78 of the side wall 62 providing proper sealing therebetween.

The end cover 18, ring member 16 and body section 14 may be suitably fastened to each other by screws indicated by the numeral 84 while the flange portion of the end cover 18 is fastened to the side wall .62 of the tank 10 by screws indicated by the numeral 86. An external connection pressure delivery port 88 and an external connection return port 90 are formed in the end cover 18 the former of which extends directly to the pressure chamber 42 which performs the function of a delivery passage and the latter of which mates with a return port 92 in the side wall 62 from which a tube 94' may lead to the interior of the tank IQ in close proximity to the opening of the inlet passage indicatedv by the numeral 96.

The tank may be mounted on the frame of a vehicle such as a tractor by screws inserted through the frame into threaded mounting pad holes in the side wall 60 indicated by the numeral 98.

It should be noted that the end cover 18 may be provided with a flange comprising a valve block including the pressure and return porting shown which may lead respectively from the pressure chamber and to the interior of the tank and in which block directional, pressure relief and flow control valves or any combination thereof may be mounted for controlling a hydraulic system adapted to operate a load device or devices.

It should thus be noted that the construction of the tank and pump housing cooperate to alleviate assembly, mounting, maintenance, and plumbing problems. No special mounting structure is needed to be provided within the tank as the opening provided in one of the side walls provides a mounting for the hub of the pump. The hub of the pump closes the opening in the side wall which may" be simply and efficiently sealed by the use of an inexpensive G-ring. The other end of the housing is mounted in the opening provided in the opposite side wall and the pump is. securely maintained by the flange 74. An inexpensive gasket may be utilized to cooperate with the end cover 18' in proper sealing of the enlarged opening. Plumbing does not have to be disconnected in the interior of the tank when the pump is removed. The screws fastening the end cover 18 to the side wall are removed and the entire pump structure may be pulled from the tank. When a flexible hose connection is utilized at the pressure and return connections, it is possible to remove the pump without disconnection of any plumbing.

The shaft is exposed at one end thereof Within the opening forming a sliding connection with the power take-ofl means of the vehicle, and the connections for the hydrau li'c system are conveniently arranged at the opposite flange. end of the pump which is on the exterior side wall of the tankfor ease of installation of plumbing connections.

While the form of embodiment of the invention as herein disclosed constitutes a preferred form, it is to be, understood that other forms might be adopted, all coming within the scope of the claims which follow.

What is claimed is as follows:

1. A combined pump and reservoir adapted for containment of fluid ot supply said pump and comprising a reservoir including two opposed walls each having an. opening therein and forming mounting portions, a pump having a housing supported in the mounting portions and extending through the reservoir openings to present two exposedouter surfaces, one at each of said walls of the reservoir, a pump delivery passage formed in the housing and opening to one of the exposed outer surfaces at one of said sidewalls, a drive shaft projecting from theother. outer surface and through the opening provided in the other side wall, and means forming fluid tight seals between the pump housing and the opposed walls of 'the reservoir.

2. A hydraulic power transmission unit comprising in. combination a fluid reservoir adapted for containment of. fluid for supplying a pump, said reservoir including two opposed side walls having opposed openings therethrough. and forming mounting portions in the side walls, a fluid pump including a housing having a spaced apart hub and a flange, said housing being supported at the hub in one mounting portion and adjacent the flange in the other mounting portion, said flange having a inner surface immediately adjoining the outer surface of the side wall. containing the other mounting portion, a pump drive shaft 4 mountedin the housing and projecting from the hub through the opening provided in the other side wall, and means for fastening the flange to the immediately adjoining side wall whereby the pump may be removed and replaced in the openings.

3. A hydraulic power transmission unit comprising in combination a fluid reservoir adapted for containment of fluid for supplying a pump, said reservoir including two opposed side wall'shaving opposed openings therethrough and forming mounting: portions in the side. walls, a fluid pump including a housing having a spaced apart hub and a flange; said housing beingv supported at the hub in one mounting portion and adjacent the flange in the other mounting portion, said flange having a inner surface immediately adjoining the outer surface of the side wall containing the other mounting portion, a pump drive shaft mounted in the housing and projecting from the hub through the opening forming the hub mounting portion, sealing means between the hub and its mounting portion, means forming. a pump delivery passage in the housing and having an opening in the flange, and means for fastening the flange to the. immediately adjoining side wall whereby the pump may be removed and replaced in the openings.

4. A combined pump and reservoir adapted for containment of fluid to supply said pump comprising a reser- V voir including. two opposed side walls each of which is prising a stator having two. extreme end mountable portions, and a. rotor having a shaft in driving relation extending. from one ofthe extreme ends of the stator, the

extreme. ends of the stator conforming substantially in area andshape with the mounting portions formed in the openings of the side walls and mounted therein with the shaft extending through one of said openings, a flange formed at the other extreme end of the stator and having an inner surface adjoining and abutting the exterior surface of the immediately adjoining side wall surrounding the opening. thereof, means forming an inlet supply passage in the. stator opening to the interior of the reservoir, means forminga delivery passage in the stator and having an openingin the said other extreme end of the stator, and means for fastening the flange to the said immediately adjoining. side wall whereby the pump may be removed andreplaced inthe openings.

5. A combined pump and reservoir adapted for containment of fluid to supply said pump comprising a reservoir having two opposed parallel side walls, each having an. opening therein forming. a mounting portion, a pump having a housing supported in the mounting portions,

face portion thereof, a pump delivery passage in the housing and having. an opening in the other exposed outer. surface portion, and. means fastening the flange to the immediately adjoining side wall whereby the pump may be removed and replaced in the openings.

6. A combined pump and reservoir for use in a hydraulicpowertransmission system and adapted for containment of fluid to supply said pump comprising a reser-- voir having two opposed parallel side walls, each having an opening therein forming a mounting portion, a pump: having. a housing supported in. the mounting portions, said. housing extending through the openings to present: two exposed. outer surfaces, one at each side wall of the reservoir, a drive shaft projecting from one 'outer surface:

through the opening in one of said side walls, a flange.

formedv on the.housing at the other exposed outer sur- 3 of which opens to said other outer surface and comprises a pump delivery passage, means forming a system return passage having an opening in the flange and leading through the flange and adjoining side wall to the interior of the reservoir.

7. A combined pump and reservoir adapted for containment of fluid to supply said pump comprising a reservoir having two opposed parallel side walls, each having an opening therein forming a mounting portion, a pump having a housing including two extreme end mountable portions supported in the mounting portions of the side walls, a drive shaft extending from one extreme end of the housing through the opening in one of said side walls, a flange formed on the other extreme end of the housing,

means for fastening the flange to the immediately adjoining side wall whereby the pump may be removed and replaced in the openings, means forming two passages in the housing one of which is a pump inlet supply pas- 6 sage and provided with an opening to the interior of the reservoir, the other of which is a pump delivery passage and provided with an opening in the said other extreme end of the housing, and means forming a passage having an opening in the flange and leading to the interior of the reservoir.

References Cited in the file of this patent UNITED STATES PATENTS 2,413,035 De Lancey a Dec. 24, 1946 2,544,987 Gardiner et a1 Mar. 13, 1951 2,646,756 Peguet July 28, 1953 2,653,548 Bodensieck Sept. 29, 1953 2,662,483 Smith et a1. Dec. 15, 1953 2,672,819 Widmer Mar. 23, 1954 2,759,423 Keel Aug. 21, 1956