CN1324307C - Non round gear and volumetric flowmeter using same - Google Patents
Non round gear and volumetric flowmeter using same Download PDFInfo
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- CN1324307C CN1324307C CNB2004100694644A CN200410069464A CN1324307C CN 1324307 C CN1324307 C CN 1324307C CN B2004100694644 A CNB2004100694644 A CN B2004100694644A CN 200410069464 A CN200410069464 A CN 200410069464A CN 1324307 C CN1324307 C CN 1324307C
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F3/00—Measuring the volume flow of fluids or fluent solid material wherein the fluid passes through the meter in successive and more or less isolated quantities, the meter being driven by the flow
- G01F3/02—Measuring the volume flow of fluids or fluent solid material wherein the fluid passes through the meter in successive and more or less isolated quantities, the meter being driven by the flow with measuring chambers which expand or contract during measurement
- G01F3/04—Measuring the volume flow of fluids or fluent solid material wherein the fluid passes through the meter in successive and more or less isolated quantities, the meter being driven by the flow with measuring chambers which expand or contract during measurement having rigid movable walls
- G01F3/06—Measuring the volume flow of fluids or fluent solid material wherein the fluid passes through the meter in successive and more or less isolated quantities, the meter being driven by the flow with measuring chambers which expand or contract during measurement having rigid movable walls comprising members rotating in a fluid-tight or substantially fluid-tight manner in a housing
- G01F3/10—Geared or lobed impeller meters
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Abstract
The number of teeth is set to 4n+2 (n is a natural number), both the ends on a long axis are set to be teeth grooves (tooth space, or the like between tooth marks 34, 35), both the ends on a short axis are set to be tips (tips, or the like of a tooth mark 31), a pitch curve is set to be, for example, an ellipse, and tooth marks 31-37, 41-47 are set to be basic tooth mark curves. With the tooth mark curve, the engagement teeth surface (teeth surface 33a, or the like) is set to be an involute curve, a non-engagement tooth surface (tooth surface 33b, or the like) is set to be a cycloid curve, and the tool pressure angle of each tooth mark is set by an undercut limit and a point limit. The non-circular gears 30, 50 bury the recess between two tooth marks (tooth marks 34, 35, and the like), holding the tooth space located at both the ends on the long axis, based on the basic tooth mark curve, and have a shape, where the tooth section including the tip (the tip, or the like of the tooth mark 31) at both the ends on the short axis are scraped off, and the number of teeth completed is finally set to 4n-2. Accordingly, it is able to obtain a non-circular gear that reduces the change in an engagement pressure angle, is advantageous for setting the tool pressure angle of an engagement teeth surface, can reduce the number of teeth without forming an overhang section, and can fully secure the sealing performance with the inner wall of a casing to be installed.
Description
Technical field
The present invention relates to the volumeter of noncircular gear and use noncircular gear.
Background technology
All the time, noncircular gear is used for volumeter and pump etc.The elliptic gear that (gear) nodel line is represented with ρ=a/ (1-bcos2 θ) in the noncircular gear, the variation of the intermeshing pressure angle that is caused by revolution is big, and, reduce the profile of tooth modulus for fear of the interference of the undercut of the profile of tooth of long diameter portion etc., make the number of teeth increase.Here said ρ is a radius vector, and a is a similarity coefficient, and b is a flatness, and θ is the drift angle.
About the technology that the variation of the intermeshing pressure angle that caused by revolution does not increase, having proposed a kind of of oval gear is elliptic gear (for example, with reference to special fair 1-39052 communique).Elliptic gear is the noncircular gear that designs like this, promptly often the substantial portion of the tooth curve on the nodel line that is engraved in gear is slotted to centre of gyration direction, thus, reduces the variation of intermeshing pressure angle, and can never become negative value.This elliptic gear, the discharge rate that turns around for every time is big, but the long term maintenance high precision is pretended and is used quite a lot ofly for the rotor of volumeter.
Prevent the technology of involute profile undercut, proposed to carry out the deformed elliptic gear (for example, with reference to " gear-type pump " of river, city Chang Xiongzhu, Nikkan Kogyo Shimbun, on August 20th, 1962 distribution, P165～166) of special displacement in the past for a long time.This deformed elliptic gear, the number of teeth are 14 using in practice, are assembled in the known pump as ebullator, are positioned at major diameter front end (top) and the hermetic unit pump inwall of gear, and each is made of 1 tooth at the two ends of long axis direction.And this deformed elliptic gear though be the profile of tooth of no undercut, has sponson.Here, so-called sponson is meant the straight line outstanding part of profile of tooth from connecting contact and elliptical center, and this contact is the contact of the mesh tooth face of nodel line and each profile of tooth.
In addition, the noncircular gear majority is made with metal material, but in view of cost, also can make by cheap ester moulding.But under the situation of the noncircular gear of considering ester moulding, needs improve formability and profile of tooth intensity are improved, and for this reason, must increase the profile of tooth modulus and reduce the number of teeth.
Reduce the technology of the number of teeth, can enumerate the deformed elliptic gear described in above-mentioned river, the city Chang Xiongzhu " gear-type pump ", but this gear has the profile of tooth that is provided with sponson.By the elliptic gear of ester moulding, when injecting the resin after coagulation, resin is shaped by shrinking to the elliptical center direction in mold, but sponson does not have shrinkage direction so can not shrink, and this part easily produces defective.Therefore, require tooth Shape Design is become not have sponson.
About noncircular gear, also proposed to have the projection gear (for example, with reference to special public clear 62-3885 communique) of projection profile of tooth.The described noncircular gear formula of special public clear 62-3885 communique flowmeter, in order to improve the measuring accuracy of small-sized flowmeter, with the discharge rate that increases every revolution 1 circle, has such noncircular gear, promptly, make the profile of tooth projection of the length-diameter part of noncircular gear, and be provided with the otch that meshes with this jut in minor axis portion.
As mentioned above, when making noncircular gear, need to improve the intensity of resin profile of tooth with ester moulding technology, therefore, necessary increasing modulus, but for increasing modulus, also restricted to the size of whole gear, require to reduce the number of teeth.But, on noncircular gear, by preventing undercut and increase cutter pressure angle that profile of tooth is tilted, only increase ratio merely with respect to the modulus of whole gear, just must form overhanging profile of tooth with ester moulding, the result, this part can produce defective.
Put down in writing such gear in the special fair 1-39052 communique, often the substantial portion of the tooth curve on the nodel line that is engraved in gear is slotted to centre of gyration direction, like this, profile of tooth is inclined to when setting cutter pressure angle (involute profile being carried out the pressure angle of the cutter of model one-tenth), intermeshing pressure angle does not become the degree of negative value, consequently, though put down in writing the elliptic gear of the profile of tooth that is designed to not possess sponson, but, the record no sponson and the minimizing number of teeth technology.
The flowmeter of putting down in writing in the special public clear 62-3885 communique, when the axle of actual design, manufacturing rotor is fixed on the projection gear of cover (being measuring room) side here, the projection at top is had to and modulus increases pro rata, therefore, also increase the bearing that to guarantee the to be located at the projection gear centre required area of packing into the concavity of the recess of this projections mesh.In addition, the projection gear of record does not have to put down in writing the technology about the minimizing number of teeth that does not have sponson yet in the special public clear 62-3885 number newspaper.Therefore, this projection gear number of teeth increases, so have to reduce the seal length (sealed width) of the inwall of the projection at its top and cover.The gear that seal length is short, thus the amount that portion leaks increases, and is not suitable for being arranged on the volumeter.
In addition, on the noncircular gear of described prior aries such as the fair 1-39052 communique of spy, in order to reduce the number of teeth, and prevent overhangingly, consider to do such design, promptly, make the tool pressure the top of the horn some, until expanding the sharp limit to, thus, profile of tooth is tilted and come to a point, but this noncircular gear does not almost have sealing with the inwall that the cover of this gear is set, and can not guarantee sealing, and being accompanied by the rotation of meshing gear, the wearing and tearing of nose part are violent.Therefore, even near the profile of tooth particularly top and its is not designed to be bent to sharp limit degree yet.
In addition, be not only the noncircular gear of ester moulding, even the noncircular gear made from metal etc. for example, the gear with the short shortcoming of the profile of tooth that makes its sharp limit of always fining away and seal length is not durable yet.Therefore, even the noncircular gear beyond the ester moulding is not done such design yet, that is, use the profile of tooth of the sharp limit of always fining away.
Summary of the invention
The present invention develops in view of above-mentioned actual conditions, the volumeter that purpose is a kind of noncircular gear is provided and has this noncircular gear, the variation of this gear meshing pressure angle is little, help the setting of the cutter pressure angle on the mesh tooth face, do not form sponson yet, and the number of teeth is few, when being arranged in the cover, can fully guarantee the sealing between the inwall of gear and cover.
The present invention is made of each technological means described in the following technical scheme.
Technical scheme 2 described second technological means are characterised in that, described each noncircular gear of first technological means is with the recess engagement of the protuberance of a noncircular gear and another noncircular gear and constitute.
Technical scheme 3 described the 3rd technological means are characterised in that, in first or second technological means, above-mentioned basic tooth curve is decided by the size that position and inwall are set of this noncircular gear in the above-mentioned cover, and above-mentioned shape is raised part to be filled up with the circular arc of the inwall of above-mentioned cover form.
The feature of technical scheme 4 described the 4th technological means is, in first or second technological means, above-mentioned tooth curve is decided by the size that position and inwall are set of this noncircular gear in the above-mentioned cover, above-mentioned shape is the curve that raised part uses the inwall with above-mentioned cover to match to be filled up form, the curve that this is filled up, be the curve that contacts during with the engagement of the end of recess, this recess is the same with this noncircular gear, the above-mentioned tooth portion of noncircular gear is cut form.
The feature of technical scheme 6 described the 6th technological means is that in each technological means of the 1st to the 5th, the nodel line of described each noncircular gear is to satisfy the single closed curve of rolling contact conditions or the closed curve that several curves are combined.
The feature of technical scheme 7 described the 7th technological means is that in first to the 6th each technological means, described each noncircular gear is made of resin.
Technical scheme 8 described the 8th technological means are characterised in that in each technological means of first to the 7th, above-mentioned cover is the measuring room of volumeter.
Technical scheme 9 described the 9th technological means, it is the volumeter that has as technical scheme 8 described a pair of noncircular gears, this volumeter is characterised in that, above-mentioned a pair of noncircular gear is meshed and is arranged in the above-mentioned measuring room as a pair of rotor, the flow that is set fluid that this a pair of rotor is discharged is measured.
Owing to be this structure, according to the present invention, the variation of the intermeshing pressure angle of noncircular gear reduces, the cutter pressure angle that helps mesh tooth face is set, also do not form sponson and make the number of teeth reduce, when being arranged in the cover, can fully guarantee sealing with the inwall that covers.
Volumeter of the present invention uses this noncircular gear, thus more firm, can carry out high-precision flow measurement.
Description of drawings
Fig. 1 is the figure of a configuration example of the volumeter of the noncircular gear of expression with an embodiment of the present invention.
Fig. 2 is the figure of a configuration example of the noncircular gear of expression an embodiment of the present invention.
A series of pie graphs of the point considered when Fig. 3 is the noncircular gear of explanation design drawing 2.
A series of pie graphs of the point considered when Fig. 4 is the noncircular gear of explanation design drawing 2.
A series of pie graphs of the point considered when Fig. 5 is the noncircular gear of explanation design drawing 2.
These a series of formation power of the point considered when Fig. 6 is the noncircular gear of explanation design drawing 2.
Fig. 7 is the figure of a configuration example of the noncircular gear of expression other form of implementation of the present invention.
Embodiment
Fig. 1 is the figure of a configuration example of the volumeter of the noncircular gear of expression with an embodiment of the present invention, and Fig. 1 (A) is that the A-A alignment of Fig. 1 (B) is looked sectional drawing, and Fig. 1 (B) is that the B-B alignment of Fig. 1 (A) is looked sectional drawing.Among the figure, symbol 10 is volumeters, and symbol 11 is basket (outer baskets), symbol 12 is end plates, symbol 15 is Magnetic Sensors, and symbol 20 is measuring rooms, and symbol 21 is inflow entrances, symbol 22 is flow exports, symbol the 23, the 27th, rotor, symbol 23a are the gear part (engaging piece) of rotor 23, and symbol 23b is the end face of rotor 23, symbol 24 is revolving shaftes of rotor 23, symbol the 25, the 26th, magnet.
The main composition of volumeter 10 partly is: outer basket 11, cap (end plates) 12, be equivalent to measuring room 20, be configured in the rotor 23 that rotatably is being supported in the measuring room 20, around turning axle 24 and reach rotor 27, the Magnetic Sensor 15 same with it by outer basket 11 and end plates 12 formed spaces.
On the axisymmetric position (being meant on the major diameter) on the end face 23b of a side rotor 23, be embedded with magnet 25,26 here.Like this, columnar magnet 25,26 is pressed in measuring room 20 in the end face 23b with the rotating pro rata rotor 23 of volume of the fluid that flows into, makes the available Magnetic Sensor 15 that is provided on the end plates 12 detect the magnetic flux of magnet 25,26.What this configuration example was represented is the example that magnet 25,26 is embedded in the rotor 23, still, also can be embedded in the rotor 27, and can only bury 1 magnet underground.
Above-mentioned volumeter, illustrated is to adopt magnetic strength to touch the flowmeter of mode, but also can adopt electromagnetic type thoughts and feelings mode, and, also can adopt the mode of the position of detection rotor (optical position detection mode) optically and mechanically the revolution of the axle of rotor is delivered to outside mode, get final product so long as can move with the revolution of any means detection rotor.
Below, the volumeter measured of the flow of the determined fluid of discharging not only to above-mentioned volumeter, to a pair of rotor, the noncircular gear that is provided with can be used as a pair of rotor engaged also describes in detail.
Fig. 2 is the figure of a configuration example of the noncircular gear of expression an embodiment of the present invention, and Fig. 2 (A), Fig. 2 (B) are the figure that the engagement of a pair of noncircular gear and its rotary position are represented accordingly.Among the figure, symbol 30 is first noncircular gears, symbol 31～37, symbol 41～47 is respectively the 1st of first noncircular gear～the 14th profile of tooth, symbol 33a, 33b, 33c represents the mesh tooth face of the 3rd profile of tooth respectively, noncircular gear, tooth top, symbol 36a, 36b, 36c represents the mesh tooth face of the 6th profile of tooth respectively, non-mesh tooth face, tooth top, symbol 38,48 is the recesses on first noncircular gear, symbol 39,49 is the protuberances on first noncircular gear, symbol 50 is second noncircular gears, symbol 51～57,61～67 represent the profile of tooth of the 1st～the 14th on second noncircular gear respectively, symbol 58, recess on 68 expressions, second noncircular gear, symbol 59, protuberance on 69 expressions, second noncircular gear, symbol 01 is the center of first noncircular gear, and symbol 02 is the center of second noncircular gear.
The noncircular gear 30,50 of an embodiment of the present invention ( rotor 23,27 that is equivalent to Fig. 1) is provided in a side of a pair of noncircular gear in the cover, is set as the noncircular gear with following tooth curve.Here, cover is equivalent to the measuring room of volumeter.Here, noncircular gear the 30, the 50th is made with resin (by shapings such as resin molds), so not only can make at an easy rate, the number of teeth is few, and, become the form of effectively utilizing characteristic of the present invention, promptly do not form because of shrink the sponson that produces defective to centre of gyration direction.But noncircular gear 30,50 is not only ester moulding certainly, also metal cutting is processed etc., can utilize various materials, manufacture method to form.
This tooth curve, be that nodel line is set as ellipse and the tooth curve of rag, the number of teeth is made as 4n+2 (n=1,2,3......), the two ends on the major axis (for example are made as teeth groove, teeth groove between profile of tooth 34 and the profile of tooth 35), two ends on the minor axis are made as tooth top (for example, the tooth top of profile of tooth 31), with profile of tooth 31～37,41～47 (under the situation of noncircular gear 50, profile of tooth 51～57,61～67) as fundamental curve.Among Fig. 2 illustration n=3 amount to the situation of 14 teeth.In addition, when n reduces or under the situation of miniature gear more, the flatness of nodel line reduces, and can make the gear of sub-circular.Here, nodel line is set as ellipse to be described, but the nodel line of noncircular gear is not limited to the nodel line ρ=a/ (1-bcos2 θ) of oval gear is the nodel line of representative, so long as satisfy the single closed curve of rolling contact conditions or closed curve that several curves are combined gets final product.
About the number of teeth, the number of teeth before the part that consideration is filled up and the part of cutting, it is the number of the profile of tooth on the original tooth curve, part according to part of filling up and cutting, number more than 6 (4n+2) gets final product, during the part of considering the part filled up and cutting described later, the final number of teeth that forms is 4n-2.In fact, tooth curve originally is the number of teeth to be made as 14 or 18 tooth curve, and it is 10 or 14 more satisfactory that the final number of teeth is respectively.
This basic tooth curve is that mesh tooth face is made as involute curve, non-mesh tooth face is made as the tooth curve of cycloidal curve.The 3rd profile of tooth 33 with first noncircular gear 30 is that example describes, and 33a is made as involute curve with mesh tooth face, and the non-mesh tooth face 33b that clips tooth top 33c is made as cycloidal curve.In addition, this tooth curve is a cutter pressure angle of setting the involute curve of each profile of tooth according to the undercut limit and the sharp limit.Non-mesh tooth face is a cycloidal curve, and cutter pressure angle is zero, and the non-mesh tooth face in the outside of nodel line is the epicycloid that forms when the outer side roll of nodel line, and the non-mesh tooth face of nodel line inboard is the hypocycloid that forms during side roll in nodel line.
In addition, noncircular gear 30,50 designs like this, promptly according to basic tooth curve, has the shape of the tooth top (for example, the tooth top of profile of tooth 31) that comprises the two ends on the minor axis having been carried out cutting in interior tooth portion.Among Fig. 2, be that the tooth top of profile of tooth 31 cuts in interior tooth portion (being equivalent to profile of tooth 31) to for example comprising, represent as shape with recess 38.Therefore, when the number of teeth of basic tooth curve was made as 4n+2, the number of teeth of final tooth curve was 4n-2.
The engagement here, not to mesh by contacting between the center of recess and protuberance, engagement with protuberance 39 and recess 58 is an example, shown in Fig. 2 (B), when the major diameter of noncircular gear 30 is consistent with the minor axis of noncircular gear 50, protuberance 39 does not contact with recess 58, the summit of the mesh tooth face of the profile of tooth 35 of the foundation of protuberance 39, contact with the mesh tooth face of the 14th profile of tooth 67 of noncircular gear 50, towards turning round to looking gyratory directions, the then summit of the mesh tooth face of the profile of tooth 34 of the foundation of protuberance 39 contacts and turns round with the mesh tooth face of the 2nd profile of tooth 52 of noncircular gear 50.Therefore, a pair of noncircular gear 30,50 shown in Figure 2 comes the turning power of the gear of My World can not make more than the opposing party's gear revolution 1 circle.But, a pair of noncircular gear 30,50, as volumeter, push the type of service of the part in the gear outside that is arranged in both sides at the mobilization force that utilizes determined fluid, can to Fig. 2 to looking gyratory directions revolution, its switching point is near (the protuberance 39 etc.) head because of the inertia relation.
About other profiles of tooth, for example the 6th profile of tooth 36 with noncircular gear 30 is an example, shown in Fig. 2 (A), the mesh tooth face side contacts of the 13rd profile of tooth 66 of the mesh tooth face 36a of profile of tooth 36 and noncircular gear 50 and meshing, then, the mesh tooth face of the profile of tooth 35 of protuberance 39 is with the mesh tooth face side contacts of the 14th profile of tooth 67 of noncircular gear 50 and mesh, so towards turning round to apparent direction.
Fig. 3～Fig. 6 is a series of pie graphs of the point considered when the noncircular gear of design drawing 2 of explanation, and any figure only represents 1/4 of noncircular gear, Figure 6 shows that Fig. 2 noncircular gear 1/4.Among the figure, L represents tooth curve, and La is a mesh tooth face, and Lb is non-mesh tooth face, Lc is a tooth top, and P is a nodel line, the radiant rays that R begins for the center from nodel line, and T is the curve of the tooth top of connection profile of tooth, B is for connecting the curve of profile of tooth bottom, and other use the symbolic representation identical with Fig. 2 in Fig. 6.
The tooth curve L of Fig. 3 is the tooth curve that nodel line P is set as oval rag, is that to establish the number of teeth be that 4n+2 (being 14 here), mesh tooth face La are that involute curve, non-mesh tooth face Lb are the tooth curve of cycloidal curve.This tooth curve L, in the zone of dividing with radiant rays R (illustrating with color), sponson extensively exists.Tooth curve L among Fig. 3 is designed to, the two ends that two ends on the major axis are made as on tooth top, the minor axis are made as teeth groove, in this design, only the cutter pressure angle that will not produce the undercut degree is set more greatly, according to this setting, even profile of tooth tilts to long axis direction, the result does not eliminate sponson yet.
When ester moulding etc.,,, promptly on 2 teeth (two ends on the major axis are made as teeth groove), establish the top profile of tooth, so that do not form sponson so therefore over-hang part branch generation defective, designs like this owing to shrink to centre of gyration direction.That is, shown in the tooth curve L of Fig. 4, design so on the contrary, that is, the two ends on the major axis are made as teeth groove, the two ends on the minor axis are made as tooth top, in addition, it is such that the tooth curve L of image pattern 4, Fig. 5 represents successively, each profile of tooth tilted, to reduce sponson to long axis direction.At this moment, mesh tooth face La uses involute curve, and still, in order to reduce the variation of intermeshing pressure angle, its cutter pressure angle is reduced to the undercut limit in requirement and intermeshing pressure angle is not the degree of negative value.But,, also have sponson by the nearest profile of tooth of major axis even on the tooth curve L of Fig. 5, so, though same mesh tooth face La involute curve in order to reduce the variation of intermeshing pressure angle, more requires its cutter pressure angle is reduced to the undercut limit and the sharp limit.In addition, non-mesh tooth face Lb adopts cycloidal curve, sets with the cutter pressure angle that helps mesh tooth face La.Here, in order to eliminate sponson, the profile of tooth that slope is the highest is the profile of tooth near the major axis two ends, so by the two ends on the major axis being set as teeth groove (recessed), can establish cutter pressure angle more greatly (arriving the maximum sharp limit greatly), to prevent undercut.
Promptly, shown in the tooth curve L of Fig. 6, each profile of tooth is tilted to long axis direction, until eliminating sponson fully, in the time of like that, because the sharp limit of fining away merely, the tooth top Lb of profile of tooth (the especially tooth top of profile of tooth 34) is sharp excessively, couples together so should eliminate the tooth top of the profile of tooth 35 of the tooth top of this sharp profile of tooth 34 and Fig. 2.In view of with by being connected the engagement of the protuberance 39 that this tooth top produces, design like this, that is, the profile of tooth on the minor axis is cut, form recess 38.The curve T that the tooth top of each profile of tooth is coupled together, and, become the curve that is parallel to nodel line with the curve that the bottom of each profile of tooth couples together.
The front end (protuberance 39) of top profile of tooth is coupled together as 1 tooth with the circular arc that is parallel to cover, remove design tooth, as described above of a side minor axis portion, not only the profile of tooth modulus increases, the number of teeth reduces and firmly, but also prevent the seal length deficiency of the top section that causes because of coming to a point, the sealing at top is improved.In addition, as Fig. 4～shown in Figure 6, having the design of teeth groove on the major axis on the basic tooth curve, also is effective to the formation of avoiding sponson.
Noncircular gear according to form of implementation, the cutter pressure angle that reduces the variation of intermeshing pressure angle and help on the mesh tooth face is set, do not form sponson yet, and the number of teeth is reduced, when being arranged in the cover, can fully guarantee the sealing of inwall with cover, and, even under axle is fixed in situation on the cover, also can guarantee the required area of bearing of packing into.This noncircular gear, because the profile of tooth modulus is with respect to generally establishing greatlyyer, thus firm, just can constitute with the less number of teeth, so also be effective ester moulding.In addition, as mentioned above, have the volume-displacement of noncircular gear, can realize firm and high-precision flowmeter, in addition, during the noncircular gear ester moulding, can realize the noncircular gear that price is low.
Fig. 7 is the figure of a configuration example of the noncircular gear of expression other forms of implementation of the present invention, and Fig. 2 (A), Fig. 2 (B) are the figure with engagement with the corresponding expression of its rotary position of a pair of noncircular gear.Among the figure, symbol 30 ' is first noncircular gear, and symbol 39 ', 49 ' is the protuberance on first noncircular gear, symbol 50 ' is second noncircular gear, symbol 59 ', 69 ' is the protuberance on second noncircular gear, and other and Fig. 2 same area are represented with same-sign, and omitted its explanation.
The noncircular gear of the illustrative form of implementation of Fig. 7, be that illustrated noncircular gear of Fig. 2～Fig. 6 and shape with protuberance ( protuberance 39,49,59,69 of Fig. 2) of the volumeter (with reference to Fig. 1) of this gear have been carried out the noncircular gear that changes, the explanation outside its crushed element comprises its effect and omits.
The noncircular gear 30 ' (50 ') of this form of implementation, be set as and use the curve that matches with the inwall that covers to fill up protuberance 39 ', the 49 ' noncircular gear of (59 ', 69 '), and the form that the curve design of filling up one-tenth contacts when meshing with the end of recess 58,68 (38,48), this recess are that the tooth portion on the noncircular gear 50 ' (30 ') is cut and forms.At this moment, tooth curve is to determine according to the size that place and inwall are set of covering interior noncircular gear.In addition, among Fig. 7, for example become the profile of tooth 34 of foundation of recess 39 ' and the mesh tooth face side of profile of tooth 35, be as the curve after the profile of tooth distortion of foundation is done design, but, become the profile of tooth 34 of foundation of protuberance 39 ' and the mesh tooth face side of profile of tooth 35, also can keep original profile of tooth and design.The noncircular gear of this form of implementation, compare with Fig. 1～form of implementation illustrated in fig. 6, under situation about being arranged on the volumeter, because the relation of intermeshing pressure angle, make entrap phenomenon obtain relaxing, thus, can reduce the pressure loss, correspondingly improve the mensuration precision with the raising of top seal.
Claims (9)
1. a pair of noncircular gear, be arranged in the cover, it is characterized in that each noncircular gear has so basic tooth curve, promptly the number of teeth is 4n+2, wherein n is a natural number, two ends on the major axis are made as teeth groove, and the two ends on the minor axis are made as tooth top, and mesh tooth face is set as involute curve, non-mesh tooth face is set as cycloidal curve
The cutter pressure angle of the involute curve of each profile of tooth on this basic tooth curve is set according to the undercut limit and the sharp limit,
Described each noncircular gear is based on above-mentioned basic tooth curve, 22 recesses that protuberances form respectively with each profile of tooth of cutting the two ends on above-mentioned minor axis that have each teeth groove between 2 profiles of tooth filling up the two ends that are positioned on the above-mentioned major axis and form respectively, described each noncircular gear has the shape that the number of teeth is 4n-2.
2. a pair of noncircular gear as claimed in claim 1 is characterized in that, described each noncircular gear is with the recess engagement of the protuberance of a noncircular gear and another noncircular gear and constitute.
3. a pair of noncircular gear as claimed in claim 1, it is characterized in that, above-mentioned basic tooth curve is decided by the size that position and inwall are set of described each noncircular gear in the above-mentioned cover, and the above-mentioned number of teeth is that the shape of 4n-2 is described protuberance to be filled up with the circular arc of the inwall of above-mentioned cover form.
4. a pair of noncircular gear as claimed in claim 1, it is characterized in that, above-mentioned basic tooth curve is decided by the size that position and inwall are set of described each noncircular gear in the above-mentioned cover, the above-mentioned number of teeth is that the shape of 4n-2 is the curve that described protuberance uses the inwall with above-mentioned cover to match to be filled up form, the curve that this is filled up is the curve that contacts during with the engagement of the end of described recess.
5. as each described a pair of noncircular gear in the claim 1～4, it is characterized in that above-mentioned basic tooth curve constitutes like this, the number of teeth of promptly establishing curve is 14 or 18, and the number of teeth becomes 10 or 14 respectively as a result.
6. as each described a pair of noncircular gear in the claim 1～4, it is characterized in that the nodel line of described each noncircular gear is to satisfy the single closed curve of rolling contact conditions or the closed curve that several curves are combined.
7. as each described a pair of noncircular gear in the claim 1～4, it is characterized in that described each noncircular gear is made of resin.
8. as each described a pair of noncircular gear in the claim 1～4, it is characterized in that above-mentioned cover is the measuring room of volumeter.
9. volumeter, has a pair of noncircular gear as claimed in claim 8, it is characterized in that, above-mentioned a pair of noncircular gear is meshed and is arranged in the above-mentioned measuring room as a pair of rotor that the flow of the determined fluid that this a pair of rotor is discharged is measured.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP178925/03 | 2003-06-24 | ||
| JP2003178925A JP3827655B2 (en) | 2003-06-24 | 2003-06-24 | Volumetric flow meter using non-circular gear and non-circular gear |
| JP178925/2003 | 2003-06-24 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1573302A CN1573302A (en) | 2005-02-02 |
| CN1324307C true CN1324307C (en) | 2007-07-04 |
Family
ID=34180371
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100694644A Expired - Fee Related CN1324307C (en) | 2003-06-24 | 2004-06-24 | Non round gear and volumetric flowmeter using same |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP3827655B2 (en) |
| KR (1) | KR100556014B1 (en) |
| CN (1) | CN1324307C (en) |
| TW (1) | TWI257476B (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI119298B (en) * | 2006-05-12 | 2008-09-30 | Osakeyhtioe Skf Aktiebolag | The oval gear meter |
| JP4252614B1 (en) * | 2008-03-03 | 2009-04-08 | 株式会社オーバル | Volumetric flow meter and helical gear |
| US8312785B2 (en) * | 2008-06-20 | 2012-11-20 | Graco Minnesota Inc. | Involute gear teeth for fluid metering device |
| KR101024119B1 (en) * | 2008-10-08 | 2011-03-22 | 주식회사 삼한 | Automatic Plan System for Gerotor Oil Pump |
| CN101413818B (en) * | 2008-12-05 | 2010-06-09 | 胡平 | Volume type high order elliptic gear flowmeter |
| JP4599454B1 (en) * | 2009-09-07 | 2010-12-15 | 株式会社オーバル | Volumetric gas-liquid two-phase flow meter and multi-phase flow measurement system |
| CN101846072B (en) * | 2010-04-23 | 2012-11-14 | 重庆大学 | Egg shape conical gear pump |
| CN101975599B (en) * | 2010-05-24 | 2012-05-02 | 上海神舟汽车节能环保有限公司 | Four-steel magnet oval gear flowmeter |
| EP3019837A4 (en) * | 2013-07-10 | 2017-04-05 | Liquid Controls Group A Unit Of Idex Corporation | Flow meters with improved blocking and displacement rotors |
| CN103758754B (en) * | 2014-01-27 | 2015-11-18 | 浙江水利水电学院 | The quaterfoil differential pump that a kind of Bath main officer of Tibet noncircular gear drives |
| US9441998B2 (en) * | 2014-07-21 | 2016-09-13 | Ecolab Usa Inc. | Oval gear meter |
| CN107817030A (en) * | 2016-09-14 | 2018-03-20 | 方惠娥 | A kind of birotor positive displacement accumulated fluid meter |
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- 2003-06-24 JP JP2003178925A patent/JP3827655B2/en not_active Expired - Fee Related
-
2004
- 2004-06-10 TW TW93116754A patent/TWI257476B/en not_active IP Right Cessation
- 2004-06-23 KR KR20040047204A patent/KR100556014B1/en not_active IP Right Cessation
- 2004-06-24 CN CNB2004100694644A patent/CN1324307C/en not_active Expired - Fee Related
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|---|---|---|---|---|
| JPS623885A (en) * | 1985-06-27 | 1987-01-09 | Sumitomo Metal Mining Co Ltd | Electrode material for resistance welding |
| JPS63132117A (en) * | 1986-11-21 | 1988-06-04 | Oval Eng Co Ltd | Positive displacement flowmeter |
| JPS6439052A (en) * | 1987-08-05 | 1989-02-09 | Matsushita Electric Works Ltd | Pin grid array |
| CN2210386Y (en) * | 1994-08-18 | 1995-10-18 | 王树波 | Flow meter with kidney shaped teeth gear |
| JPH08292078A (en) * | 1995-01-11 | 1996-11-05 | Micropump Inc | Pump/flowmeter device as unitary body |
| JPH08201135A (en) * | 1995-01-31 | 1996-08-09 | Akitoshi Kitano | Capacity type flowmeter |
| CN1153903A (en) * | 1996-01-02 | 1997-07-09 | 株式会社椭圆 | Positive displacement flowmeter |
| US6048186A (en) * | 1996-09-13 | 2000-04-11 | Kitano; Akitoshi | Driving apparatus comprising modified gear shape elliptic gear wheels |
| JP2000346689A (en) * | 1999-06-09 | 2000-12-15 | Oval Corp | Improvement of noncircular gear and noncircular gear- type flowmeter using it |
Also Published As
| Publication number | Publication date |
|---|---|
| KR100556014B1 (en) | 2006-03-03 |
| CN1573302A (en) | 2005-02-02 |
| TW200508575A (en) | 2005-03-01 |
| TWI257476B (en) | 2006-07-01 |
| JP2005017001A (en) | 2005-01-20 |
| KR20050001379A (en) | 2005-01-06 |
| JP3827655B2 (en) | 2006-09-27 |
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Granted publication date: 20070704 Termination date: 20190624 |