CA1180596A - Rotary fluid pressure device - Google Patents
Rotary fluid pressure deviceInfo
- Publication number
- CA1180596A CA1180596A CA000432132A CA432132A CA1180596A CA 1180596 A CA1180596 A CA 1180596A CA 000432132 A CA000432132 A CA 000432132A CA 432132 A CA432132 A CA 432132A CA 1180596 A CA1180596 A CA 1180596A
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- CA
- Canada
- Prior art keywords
- housing
- drive shaft
- fluid
- wobble stick
- shaft
- 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.)
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Abstract
ROTARY FLUID PRESSURE DEVICE
Abstract of Disclosure A rotary fluid pressure device is described as comprising a housing having fluid inlet and outlet openings and in the housing is a gerotor device having an external stator having internal teeth and a rotor within the stator having external teeth, one less in number than those on the stator. The rotor is eccentrically mounted with respect to the stator so that upon rotation of the rotor, the sealing engagement between the external and internal teeth forms expanding cells on one side of the line of eccentricity and forms contracting cells on the other side of the line. A drive shaft concentric with the rotor has a hollow end within the housing and a solid drive end outside of the housing. A wobble stick drivingly connects the rotor and the shaft and the wobble stick has a pivot point at its inner end connected by a rigid pivot pin with a central recess in the housing axially of the shaft which eliminates axial movement between the drive shaft and the rotor which would otherwise be caused by an uneven end formed by wear on the wobble stick. A manifold, fixed in the housing, provides a double balance pad diametrically opposite each of an inlet passage for conducting inlet fluid to each of the cells between the stator and rotor. Twelve shallow slots are hobbed over six angled holes conducting fluid to the ex-panding and contracting cells and over six radial holes lead-ing to the balance pads, giving the required accuracy. A
novel seal and thrust bearing structure, where the drive shaft exits from the housing, results in good concentricity of the seal carrier and a thrust bearing between the seal carrier and the adjacent end of the housing provides with a flow pumped by the bearing during rotation of the device, which results in a lower temperature on the seal and bearing.
Abstract of Disclosure A rotary fluid pressure device is described as comprising a housing having fluid inlet and outlet openings and in the housing is a gerotor device having an external stator having internal teeth and a rotor within the stator having external teeth, one less in number than those on the stator. The rotor is eccentrically mounted with respect to the stator so that upon rotation of the rotor, the sealing engagement between the external and internal teeth forms expanding cells on one side of the line of eccentricity and forms contracting cells on the other side of the line. A drive shaft concentric with the rotor has a hollow end within the housing and a solid drive end outside of the housing. A wobble stick drivingly connects the rotor and the shaft and the wobble stick has a pivot point at its inner end connected by a rigid pivot pin with a central recess in the housing axially of the shaft which eliminates axial movement between the drive shaft and the rotor which would otherwise be caused by an uneven end formed by wear on the wobble stick. A manifold, fixed in the housing, provides a double balance pad diametrically opposite each of an inlet passage for conducting inlet fluid to each of the cells between the stator and rotor. Twelve shallow slots are hobbed over six angled holes conducting fluid to the ex-panding and contracting cells and over six radial holes lead-ing to the balance pads, giving the required accuracy. A
novel seal and thrust bearing structure, where the drive shaft exits from the housing, results in good concentricity of the seal carrier and a thrust bearing between the seal carrier and the adjacent end of the housing provides with a flow pumped by the bearing during rotation of the device, which results in a lower temperature on the seal and bearing.
Description
~ 3~D
This application is a division of Canadian applica-tlon No.
326,540 filed Aprll 27, 197~.
The object of this invention is to provide a gerotor device having a controlled pivot po:int which locates the drive link or wobble stick relative to the housing and prevents wear by eliminating the possibility of axial movement between the drive shaft and the housing which might be caused b~ an uneven end position.
Another object i.s to provide a yradual balancing by a double balancing pad rather than an abrupt action, Anot,her object is to provide twelve shallow slots hobbed over six angle holes and six radial holes as part of the flow passageways to and from the changiny cells in the yerotor structure, the hobbing providing the required accuracy.
Another object of the inventi.on is to provide a fluid flow loop in the housing, giving a fluid flow through a needle ,~
thrust bearing next to a shaft seal, thus increasing the thrust bearing capabilities and the seal and bearing life.
A still further object of the invl_ntion i5 to provide a seal at the exit point of the drive shaft from the housing which includes a generally L-shaped spacer or carrier having one leg against the thrust bearing and the other leg against the shaft thus providing good concentricity of the seal carri.er on the shaft.
Other objects and advantages of this invention will be appar-ent from the accompanying drawings and description and the essential features thereof will be set forth in -Ihe appended claims.
The present invention provides in a rotary fluid pressure device having a housing, fluid inl.et and outlet means in said housing, an internally toothed me~er, a coacting e~ternally toothed member having a lesser number of teeth than said in-ternally toothed member and having its axis positioned eccen-t-rically relative to the axis of said internally toothed member, one of said members being rotatahle and having orbital move-ment about the axis of said other mem~er while forming e~pand-ing and contracting cells between .said members, a rigid elongated wobble stick having first and second end portions, means connected to said first end portion of said wobble stick for rotating the same, means connecting said second end portion of said wobble stick to said member having rotatable and orbital movement, and valve structure and passages positioned in said housing for communicating some of said cells with said fluid inlet means while communicating other of said cel].s with said fluid outlet means; the improvement of a wob:ble stick locating device comprising a rigid separate pin having first and second end portions, said first end portion of said pin engaging said second end portion of said wobble stick and said second end portion of said pin engaging said housing.
''t5 :3 -The present invention also provi.des a .rotary :eluia pressure device comprising a housing, fluid inlet and outlet means in said housing, an internally toothed member, a coacting exter-nally toothed member having one less tooth than said inter-nally toothed member and having its axis positioned eccentri~cally relative to the axis o~ said internally toothed member, one of said members having orbital movement about the axis of said other member while forming expanding and contracting cells between said members, a drive sha~t rotatably mounted in said housing and having a hollow end inside said housing and a drive connection at its other end, a rigid elongated wobble stick in said hollow end of said sha~t, the ends of said wobble stick having respectivelv a first rotatable ~ceyed driving connection with said shaft and a second rotatable keyed connection with said orbiting member and valve structure, passages responsive to sai~ rotatable movement ~or communica-ting at all times part of said cells with one only o~ said fluid inlet and outlet means while communicating other of said cells with the other of said fluid inlet and outlet means, 2Q and a wobble stick locating device comprising a rigid separate pin having its opposite ends engaging between said orbiting end of said wobble stick and said housing.
The present invention further provides in a fluid pressure device having a housing, a drive shaft, a gerotor structure, a wobble stick drivedly connecting the drive shaLt to the gerotor structure and ~luid inlet and outlet means, the im-provement of a wobble stic]c locating device comprising a rigid separate pin and said pin having its opposite ends engaging between the gerotor structure end o~ the wobble stick and the housing.
The present invention still further provides in a rotary fluid pressure device having a housiny, Eluid inlet and out-let means in said housing~ an internally toothed member, a coacting extexnally toothed member having one less ~ooth than said internally toothed member ana having its axis positioned 9~3~;
eccentrically relatlve to the a~is of said internally toothed member, one of said members having orhital movement about the axis of said other member while forming expanding and con-tracting cells between said members, a drive shaft rotatably mounted in said housing and having a hollow end inside said housing and a drive connection at its other end, a rigid elongated wobble stick in said hollow end of said shaft, the ends of said wobble stic~ having respectively a first rotat~
ably keyed driving connection with said shaft and a second rotatable keyed connection with said orbiting member, said device comprising valve structure and passages positioned in said housing responsive -to said rotatable movemeht for com-municating at all times part of said cells with only one of said fluid inlet and outlet means while communicating other :L5 of said cells with the other of said fluid inlet and outlet means, said drive shaft being solid at its other end and ex~
tending outside of said housing, said valve structure and passages including a manifold fixed in said housing and having a central through opening c].osely sur.rounding said drive shaft at its hollow end, said manifold having evenly spaced through holes equal in number to said teeth on said internally toothed member and arranged in a circle closely outside said central through opening; said manifold having, for each through hole, a slot opening radially inwardly to sald central through opening; said ~luid inlet means including a circular annular passageway communicating with said through opening; there being separate fluid inlet openillgs equal in number to said teeth on said externally toothed member and evenly spaced on the radially exterior face of said hollow end of said drive shaft communicating to said manifold, said fluid outlet means including fluid outlet holes through said hollow end of said drive shaft, said outlet holes being equal in number to said teeth on said externally toothed member, said outlet holes equally circumferentiall-v spaced around said hollow end of said drive shaft alternating with said Eluid inlet openings and fluid exit means from said hollow end of said drive shaft ~ 5 ...
The present invention yet further E~rovides in a fl~ld p:ressure device :including a housing, a drive shaft having a hollow end portion disposed in the housing, a gerotor structure and a wobble stick d.rivedly connecting the drive shaft at its hollow end portionwith the gero~or structure; the improvement of a wobble stick lubrication system comprising fluid inlet means into the hollow end of the drive shaft, a fluid outlet hole through the hollow end of the drive shaft, said hole located su:bstantially in the zone where the wobble stick is drivedly connected to said drive shaft, a circulax annular passageway in the housing, said hole communicating with said passageway and fluid outlet mean~ from said passageway allowing fluid to travel freely over the wobble stick where it is drivedly connected to said drive shaft thereby lubricating it.
The present invention also provides in a fluid presl;ure device having a housing/ a drive shaft having a hollow end portion disposed in the housing, the gerotor structure, a wobhle stick drivedly connecting the drive shaft at its hollow end portion to the gerotor structure and fluid irllet and outlet means r the improvement of a wobble stick locating device compr:ising a rigid separate pin and said pin having its opposi~e ends engaging between the gerotor structureend of the wobble stick and the housing, and the improvement of a wobble stick lubr:ication system comprising fluid inlet means into the hollow end of the drive shaft, a fluid outlet hole through the hollow end of the drive shaft, said hole Located substantially in the zone where the wobble stick is drivedly connected to said drive shaft, a circular annular passageway in the housing, sai.d ho:Le communicating , .. . ..
3~
w~lth E~a~ d pa~ag~wa~f and f luid outlet mean~ f rom ~id p~agew~y ~llowing ~luid to travel freely over the w~3bble stick ~7~ere it i6 dxiYedly conneeted to ~aid ~rive ~haf~ thereby lubxica~ ng it.
~he presexlt invention al80 provid~s in a f luid pr,e~ure dQvice having a housing~ a drive ~haft with an exterior ~urface and an int~3rior, a thrust bearing for ~aid ~haft, A ~;eal member a~jacent the thrust bearing, ~ gerotor structure and a wobble ~ti ::k drivedly connectiny the drive ~haft with the gerotor ~truct.ure;
the improvement of a thrllst bearing ~ ubrication system comprising 10 Iluid inlet means into the interior of said drive Eihaft, a hole extending from ~he interior of said drive shaft to ~he ext~3rior ~urface of the drive haft, ~aid hole at the exterior surface of ~aid shaft located ~ub~tantially in the zone of the ~hru~t bearing, ~ fluid passage in the h~using, said passage having two ends, one end of said pass~ge located ~ubstantially in the one of the ~hrust bearing and fluid outlet means from the other end of ~aid passage allowing said bearing to pump fluid over it~elf lubri-cating and cooling itself ~nd the ~eal member.
The present invention further provides in a fluid pressure device having a housing, a drive shaft with an exterior su.rface and an interior, a thrust bearing for said shaft, a seal m.emb~r adjacent the khrust bearing, a gerotor structuxe, a wobble stick drivedly connec~ing the drive shaft to the gerotor structure, the improvement of a wobble stick locating device comprising a rigid separate pin and ~aid pin having its opposite ends engaging between the yerotor structure end of the wobble stick and the housiny, and ~he improvement of a thrust - 5~ ~
bearing lubrication system comprisiny fluid inlet means into the interior of said drive shaft, the hole extending from ~he inter-ior of said drive shaft to the exterior surface of said drive shaft, said hole at the exterior surface of said shaft located substantially in the zone of the thrust bearing, a fluid passage in the housing, said passage having two ends~ one end of said passage located substantially in the zone of the thrust bearing and fluid outlet means from the other end of said passage allcw-ing said bearing to p~np fluid over itself lubricating and cooling itself and the seal memberO
The present invention provides too in a fluid pressure device having a housing, a drive shaft with a hollow end disposed in the housing, a thrust bearing being disposed bet.ween the drive shaft and a seal member attached to the housing, the thrust bearing haviny an inner and outer circumference, a gerotor structure, a wobble stick dri~7edly connecting the drive shaft at its hollow end with the gerotor structure and fluid passage means to the interior of the drive shaft at its hollow end;
S the improvement oE a thrust bearing lubrication device com-prising a bore, said bore extendlng from the interior of the drive shaft at its hollow end into the interior of th,e drive shaft, a hole extending from said bore to the exterior surface of the drive shaft, said hole at the exterior surface of the drive shaft located substantiall~y in the zone of the inner circumference of the thrust bearing, a passageway being located in the housing, said passageway having -two ends, one end of said passageway located substantially in the zone of the outer circumference o~ the thrust bearing and the other end of said passageway being connec-ted with a fluid exit means allowing the thrust bearing to pump fluid from the hollow end of the drive shaft through itself to lubricate and cool itself and the seal member.
FIGURE 1 is a central sectional view of the rotary fluid pressure device taken substantia:Lly along the line 1-1 of FIGURE 2.
FIGURE 2 is an end vie~ of the s~e ta]~en at the leEt-hand end of FIGURE 1.
FIGURF. 3 is a central sectional view of the drive shaft itself turned 180 from position as shown in FIGURE 1.
FIGU~ES ~ and 5 are sectional views ta]cen respectively along the lines ~-~ and 5-5 of FIGURE 3.
FIGURE 6 is an end view of FIGURE 3 taken at the right-hand end thereof.
FIGU~E 7 is a view of one of the hobbed openings ta]cen from the position of the line 7-7 of FIGURE 3, FIGURE 8 is a sectional view of the housing of FIGU~E ]. taken through the bypass shown near the left end of FIGURE 1 which connects the thrust bear:i.ny w:ith t:he :inlet fluid open.ing.
FIGURE 9 is a view of the wear p:Late taken alony the li.ne 9-9 of FIGURE 1.
FIGURE 10 is a view of the manifold taken on the line 10-10 of FIGUP~ 1.
FIGURE lOa is an enlarged end view taken in the circle of FIGURE 10 ancl being an end view looking along one of -the double balancing pads.
FIGURE 11 is a sectional view near the right-hand side of the manifold, taken along the line 1].-11 of FIGURE 1.
FIGURE 12 is a sectional view of the manifold -taken along the line 12-12 of FIGIJRE 10.
FIGU~E 13 i5 an enlarged view of the shaft seal co.nstruction shown at the left end of FIGURE 1..
FIGURE 14 is a sectional view tak:en along the line 14-14 of FIGURE 1~
FIGURE 15 is a view of the gerotor structure as seen along the line 15-15 of FIGURE 1.
FIGURES 14 and 15 are rotated 90 fxom FIGURES 9 to 12~
FIGURE 16 is a view showing the alternately arranged fluid i.n-let slots and balance pads of FIGURE 12, the same being un-rolled and presented in a linear view lookiny from the inside out.
FIGURE 16a is an enlarged view taken at the circle shown in FIGURE 16 and is really a combination of FIGURES 7 and 16.
FIGURE 17 is a view o:E the structure toward the right-hand end of the hollow portion of the drive sha:Et, the same being a view unrolled and presented li.nearly as from -the outside looking in.
~- 5 FIGURE 18 is a shaft end view of an alternate form of -the claimed rotary fluid pressure device of the present invention.
FIGURE 19 is a cen-tral sectional view of the alternate form taken generally along l.lne 19-19 of FIGURE 18.
FIGU~E 20 is an enlarged fragmentary sectional view of the a.rea 10 o a fluid outlet opening shown in FIGWRE 19.
FI~URE 21 is an enlarged fragmentary view of a :Eluid outlet opening taken along line 21-21 of FIGURE 20.
FIGURE 22 is an enlarged fragmentary end view of a fluid out let opening taken along line 22-22 of FIGUI?E 20.
15 FIGURE 23 is an enlarged ragmentary end view o:E a fluid out-let opening as it appears in combination with a wear plate.
The view is taken along the line 23-23 of FIGIJRE 20.
Referring now to FIGURES 1, 2 and 3 of the drawinys, the rotary fluid pressure device of this invention comprises a 20 housing 20 through which extends longitudinally a through openiny 21~ Into this opening :Eits a rotatable drive shaft 22 which has a hollow end 22a within the housing and a solid end portion 22b extending out the end of the housing. A mani:Eold plate 23 extends crosswi,se of the housing with seal between 25 these two parts as shown at 24. Beyond the maniEold is a wear plate 25 which is sealed by an annular seal 26 against the manifold and sealed by another annular seal 27 against the gerotor structure 28. The right-hand end oE this cornbined structure as seen in FIGURE 1 is closed by an end plate 29 30 which is sealed by an annular seal 30 against the gerotor structure. Suitable bolts 31 pac;s through the end plate 2g~
the. gerotor structure 28, the wear plate 25 and the manifold 23 and are driven into threads in the housing 20 to hold all of these par-ts rigidly together.
To start with the gerotor structure best seen in FIG. 15, the stator 32 is fixed to the plate 2~3 and has a pluralit~ of in-wardly e~tending teeth 32a which match in sealing relation with the outwardly extending teeth 33a of the rotor 33 which rotates about its center while the point R orbits around the stator center S. This action forms expanding cells numbered 5, ~ and 7 on FIG. 15 on one side of the line of eccen-tricity which runs through the points R and S, while forming contrac-ting cells on the other side of the line of eccentricity num-bered 1, 2 and 3 in FIG~ 15. It should be undexstood that the device of this invention will be explained as a pump operation operated by power applied to the ~rive shaft 22. However, the device may be used as a motor by merely switching the fluid inlet and outlet ports later mentioned so as to drive the shaft 22 by the power developed in the gerotor.
Power is transmitted be-tween the driYe shaft 22 and the rotor 33 by means of a drive link or wobble stick 34. Teeth or parallel splines 34a on the lef-t-hand end of the wobble stick as seen in FIG~ 1 mesh with coacting teeth or splines 35 provi~
ded at the lnner end of the hollow portion of the drive shaft.
At its opposite end, teeth 34b on the wobble stick rnesh with coacting teeth or splines 36 on the rotor 33. The teeth 34a and 34b are so Eoxmed as to accommodate the orbiting action of the rotor as it passes around the stator. Portions 34c are cut away at certain parts of the wobble s-tick as shown in bro]~en lines in FIG~ l to enable the flow of the operating pressure fluid past the wobble stic~ as will be later des-cribed.
One of the novel constructions in the present fluid pressure device is the termination of the wobble stick at its right-~ :Ln -hand end as seen in E'IG. 1 in a po~ition ~pclced ~rom the end plate 29, and, instead of having the wohhle stick~ impinye directly on the housing of the device, applicant uses a riyid ~eparate pin 37 ha~ing one end 37a mova~ly rota-table in an axial recess 38 in the ad~acent end of the wobble stick, and the other end 37b is rotatably mounted on the axis of the drive shaft in a recess 3~ in end plate 29. This novel drive prevents wear by eliminating the ~possibility of axial move~
ment of the wobble stick relative to the drive shaft often caused by an uneven end position, caused by wear, when the wobble stick directly engages the housing. It also provides an inexpensive part, the pin 37, to change when changing the gerotor stator 32.
The fluid inlet for this device comprises a fluid inlet open-iny 40 in the housing communicatiny through the housing to an annular inlet passageway 41 which opens radially inwardly to-ward opening 21 in the hollow end 22a of t~e drive shaft. Six separate fluid inlet openings 42 are evenly spaced on the radi-ally exterior face of the hollow end of the drive shaft as seen in FIGS. 1 and 3. Each of said inlets or openings com-prises an inclined passageway as shown at 42 communicating at one end with the annular passageway 41 and inclined inwardly toward the hollow drive shaft at an angle of approximately 15.
Within the zone of -the manifold the inclined slot communicates with a short bore ~3 extending from the outer face of the housing shaft and inwardly for a depth less than the thick~ness of the shaft wall. To cooperate with each of these separate fluid inlet openings, the manifolcl 23 has seven evenly spaced through openings 44 closely outsicle the central through open-ing 21 in the hollow end of the shaft 22. These seven open-ings are seen in FIGS. 10 and 11, numhered 1 through 7, and FIG~ 10 shows for each of these through openings, a communica-ting elongated axially extending slot 45 opening radially in-wardly to the shaft-surrounding opening 21. Each of said through openings a4 aligns with a through opening 25a in the wear plate 25, and thence into co~lmunication with one of the ~ a.~ 3.,b~
- LL -openings 32b in the stator 32 as seen in FIG, 15 and so into one of the contracting or expanding cells numbered ~rom l to 7 in FIG. 15.
One of the novel features of this invention is that the drive shaft 22 has on its outer ~all at the hollow end thereof, an axially extending, slightly barrel-shape hobbecd shallow recess 46, best seen in FIGS. 7 and 16~ extending equally in an axial direction on opposite sides of each of the short bores 43a and substantially the width centrally of the bore, and so positioned that, upon relative rotation hetween the shaft 22 and the manifold 23, as illustrated in FIG. l~A, tne bore 43 or 43a approaches the hobbed recess 46 tangent to the widest portion of such hobbed recess. In this matter, the flow through each separate inlet occurs smoothly instead of abruptly.
The introduction of inlet fluid entirely on one side of the line of eccentricity in the manifold would cause unbalancing in the manifold unless some opposite balancing effect were supplied. In the present invention this comprises the pro-vision of a balancing pad 47 opening off of said centralthrough opening 21 and directly opposite each of the slots 45 as seen in FIG, 10, Each of these balance pads is separated into two pads by an axially extending central ~artition 47a as seen in FIGS. 10 and lOA. Pressure is appliecl -to each of these pacls by a bore 43a in the hollo~l shaft wall evenly spaced between the openings 43 previously described, Each of the balance pad openings 47 in the manifold, as seen in FIG, 12, i,5 substantially the same area as the diametrically opposite slots 45 also seen in FIG, 12, Thus, the manifold O is substantially balanced at all times.
A novel seal arrangement is provicled at the lef-t-hand end of FIG. 1 where the solid portion 22b of the drive shaft exits from the housinc~ 20, This is best seen in FIGS, 1 and 13, ~n annular seal 48 e~tends entirely around the solid shaft q~ 3~
~ 12 -portion 22bo A generally L-shaped seal carrier 49 emhraces this seal and has one ley 49a flat against the axial dimen-sion of -the shaft and haviny its other end 49b with a radial flat face 49c toward a radially e~tending flat shoulder 22c on the shaft. A rotatable annular needle thrust hearing 50 is provided ~etween the flat radial surfaces 22c and 49b and tightly engaging both of such surfaces. The hollow shaf-t por-tion 21a which is in communication with -tLle bore 21 is pro-vided with a radially extending passageway 51a and communi-cates outwardly to the radial inner end of the thrust bearing50. A bypass passayeway 53 is provided between the ouker end of the radial thrust beariny and the Eluid outlet means 52.
This bypass is indicated in FIGS. 1 and 13. It results from this construction that, when the devlce is opera-ting in a rotative manner, the thrust beariny 50 acts as a small pump to pump liquid throuyh the passageway 51a through the thrust bearing and past the seal carrier 49 and throuyh the bypass 53 to the fluid outlet 52 and so on out of the machine. I'he seal carrier 49 is held by the face 49b, ayainst the thrust washer 50, in an exact position normal to the shaft 22 so that the other end of the seal carrier 49a is truly concentric with the shaft. Also, the thrust bearing race being an integral part of the seal carrier at 49b, causes the oil flow pumped by the bearing to cause a lower temperature of the seal, normally a hot point in the whole de~ice. The dust cover 54 has a seal 55 against the shaft 22 and is held in positlon by the spiral wire spring 56.
The bypass 53 is best seen in FIGS 1 and 8, The housing 20 is provided with a core to provide this bypass when this housing is cast.
The flow of the inlet fluid in the rotary fluicL pressure device of this invention has been carefully described. The flow outwardly from the gerotor is throu~h one of the open-ings 32b, through a matching passageway 25a into wear plate 25, then through a matching through opening 44 in the -- :L3 -manifold 23 and then throuyh an opening .51 throuyh the wall of the 11O11OW shaEt portion 22a and -then through the hollow opening 21a in the shaft and so into the annular opening 52a which surrouncls the shaft openiny and which is connecked through the housing to the main fluid outlet opening 58.
The purpose of FIGS. 14 and 15 in a combined showing is to illustrate diagrammatically how passages 1, 2 and 3 may be connected by fluid lines 59 to similarly numbered passages 1,
This application is a division of Canadian applica-tlon No.
326,540 filed Aprll 27, 197~.
The object of this invention is to provide a gerotor device having a controlled pivot po:int which locates the drive link or wobble stick relative to the housing and prevents wear by eliminating the possibility of axial movement between the drive shaft and the housing which might be caused b~ an uneven end position.
Another object i.s to provide a yradual balancing by a double balancing pad rather than an abrupt action, Anot,her object is to provide twelve shallow slots hobbed over six angle holes and six radial holes as part of the flow passageways to and from the changiny cells in the yerotor structure, the hobbing providing the required accuracy.
Another object of the inventi.on is to provide a fluid flow loop in the housing, giving a fluid flow through a needle ,~
thrust bearing next to a shaft seal, thus increasing the thrust bearing capabilities and the seal and bearing life.
A still further object of the invl_ntion i5 to provide a seal at the exit point of the drive shaft from the housing which includes a generally L-shaped spacer or carrier having one leg against the thrust bearing and the other leg against the shaft thus providing good concentricity of the seal carri.er on the shaft.
Other objects and advantages of this invention will be appar-ent from the accompanying drawings and description and the essential features thereof will be set forth in -Ihe appended claims.
The present invention provides in a rotary fluid pressure device having a housing, fluid inl.et and outlet means in said housing, an internally toothed me~er, a coacting e~ternally toothed member having a lesser number of teeth than said in-ternally toothed member and having its axis positioned eccen-t-rically relative to the axis of said internally toothed member, one of said members being rotatahle and having orbital move-ment about the axis of said other mem~er while forming e~pand-ing and contracting cells between .said members, a rigid elongated wobble stick having first and second end portions, means connected to said first end portion of said wobble stick for rotating the same, means connecting said second end portion of said wobble stick to said member having rotatable and orbital movement, and valve structure and passages positioned in said housing for communicating some of said cells with said fluid inlet means while communicating other of said cel].s with said fluid outlet means; the improvement of a wob:ble stick locating device comprising a rigid separate pin having first and second end portions, said first end portion of said pin engaging said second end portion of said wobble stick and said second end portion of said pin engaging said housing.
''t5 :3 -The present invention also provi.des a .rotary :eluia pressure device comprising a housing, fluid inlet and outlet means in said housing, an internally toothed member, a coacting exter-nally toothed member having one less tooth than said inter-nally toothed member and having its axis positioned eccentri~cally relative to the axis o~ said internally toothed member, one of said members having orbital movement about the axis of said other member while forming expanding and contracting cells between said members, a drive sha~t rotatably mounted in said housing and having a hollow end inside said housing and a drive connection at its other end, a rigid elongated wobble stick in said hollow end of said sha~t, the ends of said wobble stick having respectivelv a first rotatable ~ceyed driving connection with said shaft and a second rotatable keyed connection with said orbiting member and valve structure, passages responsive to sai~ rotatable movement ~or communica-ting at all times part of said cells with one only o~ said fluid inlet and outlet means while communicating other of said cells with the other of said fluid inlet and outlet means, 2Q and a wobble stick locating device comprising a rigid separate pin having its opposite ends engaging between said orbiting end of said wobble stick and said housing.
The present invention further provides in a fluid pressure device having a housing, a drive shaft, a gerotor structure, a wobble stick drivedly connecting the drive shaLt to the gerotor structure and ~luid inlet and outlet means, the im-provement of a wobble stic]c locating device comprising a rigid separate pin and said pin having its opposite ends engaging between the gerotor structure end o~ the wobble stick and the housing.
The present invention still further provides in a rotary fluid pressure device having a housiny, Eluid inlet and out-let means in said housing~ an internally toothed member, a coacting extexnally toothed member having one less ~ooth than said internally toothed member ana having its axis positioned 9~3~;
eccentrically relatlve to the a~is of said internally toothed member, one of said members having orhital movement about the axis of said other member while forming expanding and con-tracting cells between said members, a drive shaft rotatably mounted in said housing and having a hollow end inside said housing and a drive connection at its other end, a rigid elongated wobble stick in said hollow end of said shaft, the ends of said wobble stic~ having respectively a first rotat~
ably keyed driving connection with said shaft and a second rotatable keyed connection with said orbiting member, said device comprising valve structure and passages positioned in said housing responsive -to said rotatable movemeht for com-municating at all times part of said cells with only one of said fluid inlet and outlet means while communicating other :L5 of said cells with the other of said fluid inlet and outlet means, said drive shaft being solid at its other end and ex~
tending outside of said housing, said valve structure and passages including a manifold fixed in said housing and having a central through opening c].osely sur.rounding said drive shaft at its hollow end, said manifold having evenly spaced through holes equal in number to said teeth on said internally toothed member and arranged in a circle closely outside said central through opening; said manifold having, for each through hole, a slot opening radially inwardly to sald central through opening; said ~luid inlet means including a circular annular passageway communicating with said through opening; there being separate fluid inlet openillgs equal in number to said teeth on said externally toothed member and evenly spaced on the radially exterior face of said hollow end of said drive shaft communicating to said manifold, said fluid outlet means including fluid outlet holes through said hollow end of said drive shaft, said outlet holes being equal in number to said teeth on said externally toothed member, said outlet holes equally circumferentiall-v spaced around said hollow end of said drive shaft alternating with said Eluid inlet openings and fluid exit means from said hollow end of said drive shaft ~ 5 ...
The present invention yet further E~rovides in a fl~ld p:ressure device :including a housing, a drive shaft having a hollow end portion disposed in the housing, a gerotor structure and a wobble stick d.rivedly connecting the drive shaft at its hollow end portionwith the gero~or structure; the improvement of a wobble stick lubrication system comprising fluid inlet means into the hollow end of the drive shaft, a fluid outlet hole through the hollow end of the drive shaft, said hole located su:bstantially in the zone where the wobble stick is drivedly connected to said drive shaft, a circulax annular passageway in the housing, said hole communicating with said passageway and fluid outlet mean~ from said passageway allowing fluid to travel freely over the wobble stick where it is drivedly connected to said drive shaft thereby lubricating it.
The present invention also provides in a fluid presl;ure device having a housing/ a drive shaft having a hollow end portion disposed in the housing, the gerotor structure, a wobhle stick drivedly connecting the drive shaft at its hollow end portion to the gerotor structure and fluid irllet and outlet means r the improvement of a wobble stick locating device compr:ising a rigid separate pin and said pin having its opposi~e ends engaging between the gerotor structureend of the wobble stick and the housing, and the improvement of a wobble stick lubr:ication system comprising fluid inlet means into the hollow end of the drive shaft, a fluid outlet hole through the hollow end of the drive shaft, said hole Located substantially in the zone where the wobble stick is drivedly connected to said drive shaft, a circular annular passageway in the housing, sai.d ho:Le communicating , .. . ..
3~
w~lth E~a~ d pa~ag~wa~f and f luid outlet mean~ f rom ~id p~agew~y ~llowing ~luid to travel freely over the w~3bble stick ~7~ere it i6 dxiYedly conneeted to ~aid ~rive ~haf~ thereby lubxica~ ng it.
~he presexlt invention al80 provid~s in a f luid pr,e~ure dQvice having a housing~ a drive ~haft with an exterior ~urface and an int~3rior, a thrust bearing for ~aid ~haft, A ~;eal member a~jacent the thrust bearing, ~ gerotor structure and a wobble ~ti ::k drivedly connectiny the drive ~haft with the gerotor ~truct.ure;
the improvement of a thrllst bearing ~ ubrication system comprising 10 Iluid inlet means into the interior of said drive Eihaft, a hole extending from ~he interior of said drive shaft to ~he ext~3rior ~urface of the drive haft, ~aid hole at the exterior surface of ~aid shaft located ~ub~tantially in the zone of the ~hru~t bearing, ~ fluid passage in the h~using, said passage having two ends, one end of said pass~ge located ~ubstantially in the one of the ~hrust bearing and fluid outlet means from the other end of ~aid passage allowing said bearing to pump fluid over it~elf lubri-cating and cooling itself ~nd the ~eal member.
The present invention further provides in a fluid pressure device having a housing, a drive shaft with an exterior su.rface and an interior, a thrust bearing for said shaft, a seal m.emb~r adjacent the khrust bearing, a gerotor structuxe, a wobble stick drivedly connec~ing the drive shaft to the gerotor structure, the improvement of a wobble stick locating device comprising a rigid separate pin and ~aid pin having its opposite ends engaging between the yerotor structure end of the wobble stick and the housiny, and ~he improvement of a thrust - 5~ ~
bearing lubrication system comprisiny fluid inlet means into the interior of said drive shaft, the hole extending from ~he inter-ior of said drive shaft to the exterior surface of said drive shaft, said hole at the exterior surface of said shaft located substantially in the zone of the thrust bearing, a fluid passage in the housing, said passage having two ends~ one end of said passage located substantially in the zone of the thrust bearing and fluid outlet means from the other end of said passage allcw-ing said bearing to p~np fluid over itself lubricating and cooling itself and the seal memberO
The present invention provides too in a fluid pressure device having a housing, a drive shaft with a hollow end disposed in the housing, a thrust bearing being disposed bet.ween the drive shaft and a seal member attached to the housing, the thrust bearing haviny an inner and outer circumference, a gerotor structure, a wobble stick dri~7edly connecting the drive shaft at its hollow end with the gerotor structure and fluid passage means to the interior of the drive shaft at its hollow end;
S the improvement oE a thrust bearing lubrication device com-prising a bore, said bore extendlng from the interior of the drive shaft at its hollow end into the interior of th,e drive shaft, a hole extending from said bore to the exterior surface of the drive shaft, said hole at the exterior surface of the drive shaft located substantiall~y in the zone of the inner circumference of the thrust bearing, a passageway being located in the housing, said passageway having -two ends, one end of said passageway located substantially in the zone of the outer circumference o~ the thrust bearing and the other end of said passageway being connec-ted with a fluid exit means allowing the thrust bearing to pump fluid from the hollow end of the drive shaft through itself to lubricate and cool itself and the seal member.
FIGURE 1 is a central sectional view of the rotary fluid pressure device taken substantia:Lly along the line 1-1 of FIGURE 2.
FIGURE 2 is an end vie~ of the s~e ta]~en at the leEt-hand end of FIGURE 1.
FIGURF. 3 is a central sectional view of the drive shaft itself turned 180 from position as shown in FIGURE 1.
FIGU~ES ~ and 5 are sectional views ta]cen respectively along the lines ~-~ and 5-5 of FIGURE 3.
FIGURE 6 is an end view of FIGURE 3 taken at the right-hand end thereof.
FIGU~E 7 is a view of one of the hobbed openings ta]cen from the position of the line 7-7 of FIGURE 3, FIGURE 8 is a sectional view of the housing of FIGU~E ]. taken through the bypass shown near the left end of FIGURE 1 which connects the thrust bear:i.ny w:ith t:he :inlet fluid open.ing.
FIGURE 9 is a view of the wear p:Late taken alony the li.ne 9-9 of FIGURE 1.
FIGURE 10 is a view of the manifold taken on the line 10-10 of FIGUP~ 1.
FIGURE lOa is an enlarged end view taken in the circle of FIGURE 10 ancl being an end view looking along one of -the double balancing pads.
FIGURE 11 is a sectional view near the right-hand side of the manifold, taken along the line 1].-11 of FIGURE 1.
FIGURE 12 is a sectional view of the manifold -taken along the line 12-12 of FIGIJRE 10.
FIGU~E 13 i5 an enlarged view of the shaft seal co.nstruction shown at the left end of FIGURE 1..
FIGURE 14 is a sectional view tak:en along the line 14-14 of FIGURE 1~
FIGURE 15 is a view of the gerotor structure as seen along the line 15-15 of FIGURE 1.
FIGURES 14 and 15 are rotated 90 fxom FIGURES 9 to 12~
FIGURE 16 is a view showing the alternately arranged fluid i.n-let slots and balance pads of FIGURE 12, the same being un-rolled and presented in a linear view lookiny from the inside out.
FIGURE 16a is an enlarged view taken at the circle shown in FIGURE 16 and is really a combination of FIGURES 7 and 16.
FIGURE 17 is a view o:E the structure toward the right-hand end of the hollow portion of the drive sha:Et, the same being a view unrolled and presented li.nearly as from -the outside looking in.
~- 5 FIGURE 18 is a shaft end view of an alternate form of -the claimed rotary fluid pressure device of the present invention.
FIGURE 19 is a cen-tral sectional view of the alternate form taken generally along l.lne 19-19 of FIGURE 18.
FIGU~E 20 is an enlarged fragmentary sectional view of the a.rea 10 o a fluid outlet opening shown in FIGWRE 19.
FI~URE 21 is an enlarged fragmentary view of a :Eluid outlet opening taken along line 21-21 of FIGURE 20.
FIGURE 22 is an enlarged fragmentary end view of a fluid out let opening taken along line 22-22 of FIGUI?E 20.
15 FIGURE 23 is an enlarged ragmentary end view o:E a fluid out-let opening as it appears in combination with a wear plate.
The view is taken along the line 23-23 of FIGIJRE 20.
Referring now to FIGURES 1, 2 and 3 of the drawinys, the rotary fluid pressure device of this invention comprises a 20 housing 20 through which extends longitudinally a through openiny 21~ Into this opening :Eits a rotatable drive shaft 22 which has a hollow end 22a within the housing and a solid end portion 22b extending out the end of the housing. A mani:Eold plate 23 extends crosswi,se of the housing with seal between 25 these two parts as shown at 24. Beyond the maniEold is a wear plate 25 which is sealed by an annular seal 26 against the manifold and sealed by another annular seal 27 against the gerotor structure 28. The right-hand end oE this cornbined structure as seen in FIGURE 1 is closed by an end plate 29 30 which is sealed by an annular seal 30 against the gerotor structure. Suitable bolts 31 pac;s through the end plate 2g~
the. gerotor structure 28, the wear plate 25 and the manifold 23 and are driven into threads in the housing 20 to hold all of these par-ts rigidly together.
To start with the gerotor structure best seen in FIG. 15, the stator 32 is fixed to the plate 2~3 and has a pluralit~ of in-wardly e~tending teeth 32a which match in sealing relation with the outwardly extending teeth 33a of the rotor 33 which rotates about its center while the point R orbits around the stator center S. This action forms expanding cells numbered 5, ~ and 7 on FIG. 15 on one side of the line of eccen-tricity which runs through the points R and S, while forming contrac-ting cells on the other side of the line of eccentricity num-bered 1, 2 and 3 in FIG~ 15. It should be undexstood that the device of this invention will be explained as a pump operation operated by power applied to the ~rive shaft 22. However, the device may be used as a motor by merely switching the fluid inlet and outlet ports later mentioned so as to drive the shaft 22 by the power developed in the gerotor.
Power is transmitted be-tween the driYe shaft 22 and the rotor 33 by means of a drive link or wobble stick 34. Teeth or parallel splines 34a on the lef-t-hand end of the wobble stick as seen in FIG~ 1 mesh with coacting teeth or splines 35 provi~
ded at the lnner end of the hollow portion of the drive shaft.
At its opposite end, teeth 34b on the wobble stick rnesh with coacting teeth or splines 36 on the rotor 33. The teeth 34a and 34b are so Eoxmed as to accommodate the orbiting action of the rotor as it passes around the stator. Portions 34c are cut away at certain parts of the wobble s-tick as shown in bro]~en lines in FIG~ l to enable the flow of the operating pressure fluid past the wobble stic~ as will be later des-cribed.
One of the novel constructions in the present fluid pressure device is the termination of the wobble stick at its right-~ :Ln -hand end as seen in E'IG. 1 in a po~ition ~pclced ~rom the end plate 29, and, instead of having the wohhle stick~ impinye directly on the housing of the device, applicant uses a riyid ~eparate pin 37 ha~ing one end 37a mova~ly rota-table in an axial recess 38 in the ad~acent end of the wobble stick, and the other end 37b is rotatably mounted on the axis of the drive shaft in a recess 3~ in end plate 29. This novel drive prevents wear by eliminating the ~possibility of axial move~
ment of the wobble stick relative to the drive shaft often caused by an uneven end position, caused by wear, when the wobble stick directly engages the housing. It also provides an inexpensive part, the pin 37, to change when changing the gerotor stator 32.
The fluid inlet for this device comprises a fluid inlet open-iny 40 in the housing communicatiny through the housing to an annular inlet passageway 41 which opens radially inwardly to-ward opening 21 in the hollow end 22a of t~e drive shaft. Six separate fluid inlet openings 42 are evenly spaced on the radi-ally exterior face of the hollow end of the drive shaft as seen in FIGS. 1 and 3. Each of said inlets or openings com-prises an inclined passageway as shown at 42 communicating at one end with the annular passageway 41 and inclined inwardly toward the hollow drive shaft at an angle of approximately 15.
Within the zone of -the manifold the inclined slot communicates with a short bore ~3 extending from the outer face of the housing shaft and inwardly for a depth less than the thick~ness of the shaft wall. To cooperate with each of these separate fluid inlet openings, the manifolcl 23 has seven evenly spaced through openings 44 closely outsicle the central through open-ing 21 in the hollow end of the shaft 22. These seven open-ings are seen in FIGS. 10 and 11, numhered 1 through 7, and FIG~ 10 shows for each of these through openings, a communica-ting elongated axially extending slot 45 opening radially in-wardly to the shaft-surrounding opening 21. Each of said through openings a4 aligns with a through opening 25a in the wear plate 25, and thence into co~lmunication with one of the ~ a.~ 3.,b~
- LL -openings 32b in the stator 32 as seen in FIG, 15 and so into one of the contracting or expanding cells numbered ~rom l to 7 in FIG. 15.
One of the novel features of this invention is that the drive shaft 22 has on its outer ~all at the hollow end thereof, an axially extending, slightly barrel-shape hobbecd shallow recess 46, best seen in FIGS. 7 and 16~ extending equally in an axial direction on opposite sides of each of the short bores 43a and substantially the width centrally of the bore, and so positioned that, upon relative rotation hetween the shaft 22 and the manifold 23, as illustrated in FIG. l~A, tne bore 43 or 43a approaches the hobbed recess 46 tangent to the widest portion of such hobbed recess. In this matter, the flow through each separate inlet occurs smoothly instead of abruptly.
The introduction of inlet fluid entirely on one side of the line of eccentricity in the manifold would cause unbalancing in the manifold unless some opposite balancing effect were supplied. In the present invention this comprises the pro-vision of a balancing pad 47 opening off of said centralthrough opening 21 and directly opposite each of the slots 45 as seen in FIG, 10, Each of these balance pads is separated into two pads by an axially extending central ~artition 47a as seen in FIGS. 10 and lOA. Pressure is appliecl -to each of these pacls by a bore 43a in the hollo~l shaft wall evenly spaced between the openings 43 previously described, Each of the balance pad openings 47 in the manifold, as seen in FIG, 12, i,5 substantially the same area as the diametrically opposite slots 45 also seen in FIG, 12, Thus, the manifold O is substantially balanced at all times.
A novel seal arrangement is provicled at the lef-t-hand end of FIG. 1 where the solid portion 22b of the drive shaft exits from the housinc~ 20, This is best seen in FIGS, 1 and 13, ~n annular seal 48 e~tends entirely around the solid shaft q~ 3~
~ 12 -portion 22bo A generally L-shaped seal carrier 49 emhraces this seal and has one ley 49a flat against the axial dimen-sion of -the shaft and haviny its other end 49b with a radial flat face 49c toward a radially e~tending flat shoulder 22c on the shaft. A rotatable annular needle thrust hearing 50 is provided ~etween the flat radial surfaces 22c and 49b and tightly engaging both of such surfaces. The hollow shaf-t por-tion 21a which is in communication with -tLle bore 21 is pro-vided with a radially extending passageway 51a and communi-cates outwardly to the radial inner end of the thrust bearing50. A bypass passayeway 53 is provided between the ouker end of the radial thrust beariny and the Eluid outlet means 52.
This bypass is indicated in FIGS. 1 and 13. It results from this construction that, when the devlce is opera-ting in a rotative manner, the thrust beariny 50 acts as a small pump to pump liquid throuyh the passageway 51a through the thrust bearing and past the seal carrier 49 and throuyh the bypass 53 to the fluid outlet 52 and so on out of the machine. I'he seal carrier 49 is held by the face 49b, ayainst the thrust washer 50, in an exact position normal to the shaft 22 so that the other end of the seal carrier 49a is truly concentric with the shaft. Also, the thrust bearing race being an integral part of the seal carrier at 49b, causes the oil flow pumped by the bearing to cause a lower temperature of the seal, normally a hot point in the whole de~ice. The dust cover 54 has a seal 55 against the shaft 22 and is held in positlon by the spiral wire spring 56.
The bypass 53 is best seen in FIGS 1 and 8, The housing 20 is provided with a core to provide this bypass when this housing is cast.
The flow of the inlet fluid in the rotary fluicL pressure device of this invention has been carefully described. The flow outwardly from the gerotor is throu~h one of the open-ings 32b, through a matching passageway 25a into wear plate 25, then through a matching through opening 44 in the -- :L3 -manifold 23 and then throuyh an opening .51 throuyh the wall of the 11O11OW shaEt portion 22a and -then through the hollow opening 21a in the shaft and so into the annular opening 52a which surrouncls the shaft openiny and which is connecked through the housing to the main fluid outlet opening 58.
The purpose of FIGS. 14 and 15 in a combined showing is to illustrate diagrammatically how passages 1, 2 and 3 may be connected by fluid lines 59 to similarly numbered passages 1,
2 and 3 in a gerotor structure whi.le passages 5, 6 and 7 of the gerotor are connected by fluid passageways 60 to the through passages 5, 6 and 7 of the manifold, The p~rpose of FIGS. 16, 16A and 17 is to i.llustrate cliagram-matically how the slots 45 and the pad openings occur alter-nately around the manifold to one looking outwardly from the center of the manifold, and how the hobbed opening 46 approaches tangentially at X to the slots 45 or to the valve's pad openings of 47.
The view of FIG. 17 is from the hollow shaft wall 22a looking inwardly to the cooperating openings.
It should be Mentioned that this invention requires exact positioning of the manifold 23 relative to the hou.sing 20 and to this end dowel pins 61, seen in FIG. 1, enter some sui-table openings 62 seen in FIGS. 10, 11 a:nd 14 so as to very accurate-ly position these two parts.
FIGURES 13 to 23 disclose an alter:nate form of this rotary fluid pressure invention. Substantially equivalent details will be covered in summary form; only -the main points of difference between the two forms will be discussed in detail.
Interchangeable parts continue to be numbered as in the first form. Different non-interchangeable parts are labeled Z.
The alternate form of this i.nvention comprises a moclifiecl !) q~D ~.~ $~
housing 20Z thxough which ex-tends a through opening 21. ~Cn-to this opening fits a rotatable drive shaft 22 which has a hol low end 22a within the housing and a solid end portlon 22b e~tending out of one end of the housing 20Z. A wear plate 25 is sealed by an annular seal 26Z agains-t the other end of the housing 20Z and sealed by another annular seal 27 against the gerotor structure 2~. An end plate 29Z i5 sealed by an annular seal 30 against the gerotor structure 28. Suitahle bolts 31 pass through the end plate 29Z, the gero-tor structure 28 and the wear plate 25 and are attached by threads in the housing 20Z to hold all of these parts rigidly together, (There is no separate manifold plate 23.) Power is transmitted between the clrive shaft 22 and the gerotor structure 28 by means of a dri~e lin]~ or wobble stick 34. A rigid separate pin 37 prevents axial movement of the wobble stick 34 relative to the drive shaft.
The gerotor structure 28 has a stator 32 and a rotor 33 which rotates about its center R while -the center P~ orbits around the stator center S forming expandiny cells on one side of a line of eccentricity and contracting cells on the other side of a line of eccentricity. These cells communicate with fluid inlet means or fluid outlet means through openings 25A in the wear plate 25, In a point of major difference with the earlier disclosed form, this alternate form has seven pairs of evenly spaced inter-secting holes 66Z and 67Z in the other end of the modified housing 20Z forminy the fluid passage means between the ex-panding and contracting gerotor cells and the fluid inlet bores 43 and fluid outlet holes 51, respectively. This is to be contrasted with the earlier disclosed form of this inven tion wherein the same ends were accomplished in a separate manifold 23 by seven evenly spaced through openings ~4 con-nected to elongated axially extending slots 45, 36,1! r ~P
- :1.5 ~
Each hole 67Z is an anJled throuyh h~le connectiny the end ~ace 69 of the houslng with the inner through openiny 21 Because hole 67Z intersects these surfaces at an angle, it presents elliptical openings. ~Iole 66Z is an axially exten-ding hole from the end face 69 located slightly off centerand below the end ~ace opening of hole 67Z (See FIGU~E 22).
Both holes 66Z and 67Z at their openings in the end face 69 open through the wear pla-te 25 into the gerotor cells (See FIGURE 23~. These holes intersect within the housing at port 68. This port greatly increased the vo]ume of fluid that can pass through the passage system over that which could pass through either hole 66Z or hole 67Z alone In particular, if the angled through hole 67Z was the only fluid passage conduit between the valving means and the gerotor cell~ -there would be no advantage to the elliptical section it presents at i-ts intersection ~lith both. The limiting factor to fluid flow would be the circular diameter of hole 67Z. ~owever, because it intersects with hole 66Z at port 68 and together they con-duct ~luid, the size of the effective cross section of the main passageway is increased complementing the elliptical openings. Fluid can now flow freely between openings without the problems of cross-sectional construction.
In another point of dif~erence, bores 43 and holes 51 now ter-minate in shallow elliptical hollows instead of straight sections, The fluid enters through a main :Elui.d inle-t opening 40 in the housing 20Z into a shaft surroundiny circular annular passage-way 41. The fluid travels from this passageway 41 through openings 42 into short bores 43. These openings 42 and shor-t bores 43 are evenly spaced in pairs on the radiall~l exterior Eace of the hollow end of the drive shaft. The fluid then travels through these short bores to enter hole 67Z and the expanding gerotor cells.
The fluid exits the contracting cells and hole 67Z through t'.~ 5~3 --:L6 --througl~ the six holes 5:1 through the wall of dx:iv~ sha~t 15 hollow end 22a. These holes 51 are evenly spaced on the radially exterior face of the hol]ow end of the drive shaft.
The fluid travels through the hollow opening 21a in the shaft and so into the annular opening 52a which surrounds the shaft opening and which is connected through the housing 20Z to the main fluid outlet opening 5~.
Although the invention is designed for use as a motor, it is to be understood that it operates as a pump if the fluid in-let and outlet connections are reversed.
Our invention is sturdily constructed of few parts; the ~earis carefully designed to be concentratecl in four parts easily replaced in the fielcl without major stripclown or even removing the device from allied machinery.
~he first alternate form of the invention ~FIGURES 1-17) has its advantages in that it is amena~le to precision construc-tion on readily available machinery. The second alternate form of the invention is stronger and made of fewer parts.
All parts are ~ield replaceable, and most others are inter-changeable between forms.
While I have illustrated and described a preferred embodimentof my invention, it will be understood -that this embodiment is by way of example only and not be construed as limiting,
The view of FIG. 17 is from the hollow shaft wall 22a looking inwardly to the cooperating openings.
It should be Mentioned that this invention requires exact positioning of the manifold 23 relative to the hou.sing 20 and to this end dowel pins 61, seen in FIG. 1, enter some sui-table openings 62 seen in FIGS. 10, 11 a:nd 14 so as to very accurate-ly position these two parts.
FIGURES 13 to 23 disclose an alter:nate form of this rotary fluid pressure invention. Substantially equivalent details will be covered in summary form; only -the main points of difference between the two forms will be discussed in detail.
Interchangeable parts continue to be numbered as in the first form. Different non-interchangeable parts are labeled Z.
The alternate form of this i.nvention comprises a moclifiecl !) q~D ~.~ $~
housing 20Z thxough which ex-tends a through opening 21. ~Cn-to this opening fits a rotatable drive shaft 22 which has a hol low end 22a within the housing and a solid end portlon 22b e~tending out of one end of the housing 20Z. A wear plate 25 is sealed by an annular seal 26Z agains-t the other end of the housing 20Z and sealed by another annular seal 27 against the gerotor structure 2~. An end plate 29Z i5 sealed by an annular seal 30 against the gerotor structure 28. Suitahle bolts 31 pass through the end plate 29Z, the gero-tor structure 28 and the wear plate 25 and are attached by threads in the housing 20Z to hold all of these parts rigidly together, (There is no separate manifold plate 23.) Power is transmitted between the clrive shaft 22 and the gerotor structure 28 by means of a dri~e lin]~ or wobble stick 34. A rigid separate pin 37 prevents axial movement of the wobble stick 34 relative to the drive shaft.
The gerotor structure 28 has a stator 32 and a rotor 33 which rotates about its center R while -the center P~ orbits around the stator center S forming expandiny cells on one side of a line of eccentricity and contracting cells on the other side of a line of eccentricity. These cells communicate with fluid inlet means or fluid outlet means through openings 25A in the wear plate 25, In a point of major difference with the earlier disclosed form, this alternate form has seven pairs of evenly spaced inter-secting holes 66Z and 67Z in the other end of the modified housing 20Z forminy the fluid passage means between the ex-panding and contracting gerotor cells and the fluid inlet bores 43 and fluid outlet holes 51, respectively. This is to be contrasted with the earlier disclosed form of this inven tion wherein the same ends were accomplished in a separate manifold 23 by seven evenly spaced through openings ~4 con-nected to elongated axially extending slots 45, 36,1! r ~P
- :1.5 ~
Each hole 67Z is an anJled throuyh h~le connectiny the end ~ace 69 of the houslng with the inner through openiny 21 Because hole 67Z intersects these surfaces at an angle, it presents elliptical openings. ~Iole 66Z is an axially exten-ding hole from the end face 69 located slightly off centerand below the end ~ace opening of hole 67Z (See FIGU~E 22).
Both holes 66Z and 67Z at their openings in the end face 69 open through the wear pla-te 25 into the gerotor cells (See FIGURE 23~. These holes intersect within the housing at port 68. This port greatly increased the vo]ume of fluid that can pass through the passage system over that which could pass through either hole 66Z or hole 67Z alone In particular, if the angled through hole 67Z was the only fluid passage conduit between the valving means and the gerotor cell~ -there would be no advantage to the elliptical section it presents at i-ts intersection ~lith both. The limiting factor to fluid flow would be the circular diameter of hole 67Z. ~owever, because it intersects with hole 66Z at port 68 and together they con-duct ~luid, the size of the effective cross section of the main passageway is increased complementing the elliptical openings. Fluid can now flow freely between openings without the problems of cross-sectional construction.
In another point of dif~erence, bores 43 and holes 51 now ter-minate in shallow elliptical hollows instead of straight sections, The fluid enters through a main :Elui.d inle-t opening 40 in the housing 20Z into a shaft surroundiny circular annular passage-way 41. The fluid travels from this passageway 41 through openings 42 into short bores 43. These openings 42 and shor-t bores 43 are evenly spaced in pairs on the radiall~l exterior Eace of the hollow end of the drive shaft. The fluid then travels through these short bores to enter hole 67Z and the expanding gerotor cells.
The fluid exits the contracting cells and hole 67Z through t'.~ 5~3 --:L6 --througl~ the six holes 5:1 through the wall of dx:iv~ sha~t 15 hollow end 22a. These holes 51 are evenly spaced on the radially exterior face of the hol]ow end of the drive shaft.
The fluid travels through the hollow opening 21a in the shaft and so into the annular opening 52a which surrounds the shaft opening and which is connected through the housing 20Z to the main fluid outlet opening 5~.
Although the invention is designed for use as a motor, it is to be understood that it operates as a pump if the fluid in-let and outlet connections are reversed.
Our invention is sturdily constructed of few parts; the ~earis carefully designed to be concentratecl in four parts easily replaced in the fielcl without major stripclown or even removing the device from allied machinery.
~he first alternate form of the invention ~FIGURES 1-17) has its advantages in that it is amena~le to precision construc-tion on readily available machinery. The second alternate form of the invention is stronger and made of fewer parts.
All parts are ~ield replaceable, and most others are inter-changeable between forms.
While I have illustrated and described a preferred embodimentof my invention, it will be understood -that this embodiment is by way of example only and not be construed as limiting,
Claims (8)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. In a rotary fluid pressure device having a housing, fluid inlet and outlet means in said housing an internally toothed member, a coacting externally toothed member having a lesser number of teeth than said internally toothed member and having its axis positioned eccentrically relative to the axis of said internally toothed member, one of said members being rotatable and having orbital movement about the axis of said other member while forming expanding and contracting cells between said members, a rigid elongated wobble stick having first and second end portions, means connected to said first end portion of said wobble stick for rotating the same, means connecting said second end portion of said wobble stick to said member having rotatable and orbital movement, and valve structure and passages positioned in said housing for communi-cating some of said cells with said fluid inlet means while communicating other of said cells with said fluid outlet means;
the improvement of a wobble stick locating device comprising a rigid separate pin having first and second end portions, said first end portion of said pin engaging said second end portion of said wobble stick and said second end portion of said pin engaging said housing.
the improvement of a wobble stick locating device comprising a rigid separate pin having first and second end portions, said first end portion of said pin engaging said second end portion of said wobble stick and said second end portion of said pin engaging said housing.
2. A rotary fluid pressure device as claimed in Claim 1 wherein said internally toothed member is fixed and said ex-ternally toothed member is rotatable and has orbital movement.
3. A rotary fluid pressure device comprising a housing, fluid inlet and outlet means in said housing, an internally toothed member, a coacting externally toothed member having one less tooth than said internally toothed member and having its axis positioned eccentrically relative to the axis of said internally toothed member, one of said members having orbital movement about the axis of said other member while forming expanding and contracting cells between said members, a drive shaft rotatably mounted in said housing and having a hollow end inside said housing and a drive connection at its other end, a rigid elongated wobble stick in said hollow end of said shaft, the ends of said wobble stick having respec-tively a first rotatable keyed driving connection with said shaft and a second rotatable keyed connection with said orbit-ing member and valve structure, passages responsive to said rotatable movement for communicating at all times part of said cells with one only of said fluid inlet and outlet means while communicating other of said cells with the other of said fluid inlet and outlet means, and a wobble stick locating device comprising a rigid separate pin having its opposite ends engaging between said orbiting end of said wobble stick and said housing.
4. A rotary fluid pressure device as defined in Claim 3 wherein said internally toothed member is a stator fixed in said housing, said externally toothed member is a rotor, said rotor having rotational movement about its axis and having orbital movement about said stator axis, the teeth of said rotor and stator intermeshing during said orbiting move-ment in substantially sealing engagement to form said expand-ing cells on one side of the line of eccentricity and to form said contracting cells on the other side of said line.
5. In a fluid pressure device having a housing, a drive shaft, a gerotor structure, a wobble stick drivedly connect-ing the drive shaft to the gerotor structure and fluid inlet and outlet means, the improvement of a wobble stick locating device comprising a rigid separate pin and said pin having its opposite ends engaging between the gerotor structure end of the wobble stick and the housing.
6. In a fluid pressure device having a housing, a drive shaft having a hollow end portion disposed in the housing, a gerotor structure, a wobble stick drivedly connecting the draft shaft at its hollow end portion to the gerotor struc-ture and fluid inlet and outlet means, the improvement of a wobble stick locating device comprising a rigid separate pin and said pin having its opposite ends engaging between the gerotor structure end of the wobble stick and the housing, and the improvement of a wobble stick lubrication system compris-ing fluid inlet means into the hollow end of the drive shaft, a fluid outlet hole through the hollow end of the drive shaft, said hole located substantially in the zone where the wobble stick is drivedly connected to said drive shaft, a circular annular passageway in the housing, said hole communicating with said passageway and fluid outlet means from said pas-sageway allowing fluid to travel freely over the wobble stick where it is drivedly connected to said drive shaft thereby lubricating it.
7. In a fluid pressure device having a housing, a drive shaft with an exterior surface and an interior, a thrust bearing for said shaft, a seal member adjacent the thrust bearing, a gerotor structure, a wobble stick drivedly connecting the drive shaft to the gerotor structure, the improvement of a wobble stick locating device comprising a rigid separate pin and said pin having its opposite ends engaging between the gerotor structure end or the wobble stick and the housing and the improvement of a thrust bearing lubrication system comprising fluid inlet means into the interior of said drive shaft, a hole extending from the interior of said drive shaft to the exterior surface of said drive shaft, said hole at the exterior surface of said shaft located substantially in the zone of the thrust bearing, a fluid passage in the housing, said passage having two ends, one end of said passage located substantially in the zone of the thrust bearing and fluid outlet means from the other end of said passage allowing said bearing to pump fluid over itself lubricating and cooling itself and the seal member.
8. The structure of Claim 7 characterized in that said fluid passage is a separate tubular passage in the housing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000432132A CA1180596A (en) | 1978-05-08 | 1983-07-08 | Rotary fluid pressure device |
Applications Claiming Priority (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US90358978A | 1978-05-08 | 1978-05-08 | |
| US903,589 | 1978-05-08 | ||
| US06/029,019 US4285643A (en) | 1978-05-08 | 1979-04-12 | Rotary fluid pressure device |
| US29,019 | 1979-04-12 | ||
| CA000326540A CA1153247A (en) | 1978-05-08 | 1979-04-27 | Rotary fluid pressure device |
| CA000432132A CA1180596A (en) | 1978-05-08 | 1983-07-08 | Rotary fluid pressure device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1180596A true CA1180596A (en) | 1985-01-08 |
Family
ID=27426146
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000432132A Expired CA1180596A (en) | 1978-05-08 | 1983-07-08 | Rotary fluid pressure device |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1180596A (en) |
-
1983
- 1983-07-08 CA CA000432132A patent/CA1180596A/en not_active Expired
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