Design device and modeling method for circular-arc tooth profile of internal meshing oil pump rotor

Abstract

The design device comprises a positioning support and an integrated computer, the top end of the positioning support is fixedly connected with an assembly cylinder, the back of the integrated computer is fixedly connected with a positioning seat, one end of the positioning seat is fixedly connected with a supporting column, and the other end of the positioning seat is fixedly connected with a supporting rod. An assembling ball is fixed to the end, away from the positioning base, of the supporting column, the assembling ball is further movably connected to the interior of the assembling cylinder, a locking assembly is arranged in the supporting column and used for locking the position of the assembling ball, and a stability maintaining assembly is arranged at the bottom end of the positioning support. According to the method, through overall structure matching, the circular-arc tooth profile of the internal meshing oil pump rotor can be correctly designed by using conventional office software and 3D software such as Pro / E or UG, parametric modeling is completed, overall limitation is greatly reduced, and overall design of the circular-arc tooth profile of the internal meshing oil pump rotor is more convenient.

Description

Technical Field

[0001] The invention relates to the technical field of circular arc tooth profile design of an oil pump rotor, in particular to a design device for circular arc tooth profile of an internal meshing oil pump rotor and a modeling method thereof. Background Art

[0002] The internal meshing oil pump adopts the principle of gear internal meshing. The pitch circles of the inner and outer gears are close to one side, and the other side is separated by the "crescent plate" on the pump cover. The active inner gear on the main shaft drives the outer gear to rotate in the same direction. The gears separate from each other at the inlet to form a negative pressure to suck in the liquid. The gears are continuously embedded and meshed at the outlet to squeeze out the liquid. It is suitable for conveying petroleum, chemicals, coatings, dyes, food, grease, medicine and other industries;

[0003] At present, before the rotor of the internal meshing oil pump is produced, it is necessary to design the circular arc tooth profile of the rotor. After searching, a method for designing the circular arc tooth profile of a rotor oil pump with the publication number of CN115688395A was found. The method can realize the design of any parameters and provide technical support for the development of new products. However, in the specific application process, the following problems still exist:

[0004] 1. When the inner rotor of the internal meshing oil pump rotor is not a short-amplitude epicycloid, it cannot be designed according to the cycloid rotor profile.

[0005] 2. Special tools are required, which results in high overall limitations.

[0006] To this end, the present invention provides a design device for an arc tooth profile of an internal meshing oil pump rotor and a modeling method thereof to solve the above-mentioned problem. Summary of the invention

[0007] In view of the deficiencies in the prior art, the present invention provides a design device for an arc tooth profile of an internal meshing oil pump rotor and a modeling method thereof, which solve the above-mentioned problems.

[0008] To achieve the above objectives, the present invention is implemented through the following technical solutions: a design device for the circular arc tooth profile of an internal meshing oil pump rotor, comprising a positioning bracket and an all-in-one computer, the top of the positioning bracket is fixedly connected to an assembly cylinder, the back of the all-in-one computer is fixedly connected to a positioning seat, one end of the positioning seat is fixedly connected to a support column, an assembly ball is fixed at the end of the support column away from the positioning seat, and the assembly ball is also movably connected to the inside of the assembly cylinder, a locking assembly is arranged inside the support column, and the locking assembly is used to lock the position of the assembly ball, and a stabilization assembly is arranged at the bottom end of the positioning bracket.

[0009] Preferably, the locking assembly includes a transmission shaft, a transmission plate, a travel slot, a limit seat, a linear shaft and a displacement frame, the support column is rotatably connected to the transmission shaft inside, one end of the transmission shaft located outside the support column is fixedly connected to the transmission plate, a travel slot is provided in the middle of the transmission plate, one end of the back of the integrated computer is fixedly connected to the limit seat, the inner side of the limit seat is fixedly connected to the linear shaft, the outer side of the linear shaft is slidably connected to the displacement frame, and one end of the displacement frame is also movably connected to the inside of the travel slot, A coil spring is fixedly connected between the bottom of the frame and the limit seat, a plurality of carrying tubes are fixedly connected to the inner wall of the assembly ball, a positioning shaft is slidably connected inside each of the carrying tubes, a positioning block is fixedly connected to the top of the positioning shaft, a stabilizing spring is fixedly connected between the bottom end of the positioning block and the carrying tube, a linkage frame is fixedly connected to the bottom end of the positioning shaft, one end of the transmission shaft located inside the assembly ball is rotatably connected to a linkage plate corresponding to a plurality of linkage frames, and an end of the linkage plate away from the transmission shaft is rotatably connected to the corresponding linkage frame.

[0010] Preferably, the stabilization maintenance component includes a support base, a limiting shaft rod, an extension leg, a guide frame and a transmission screw, the bottom end of the positioning bracket is fixedly connected to the support base, the top of one side of the support base is rotatably connected to two limiting shaft rods, the bottom end of each limiting shaft rod is fixedly connected to the extension leg, the middle parts of the two limiting shaft rods are fixedly connected to the guide frame, the middle part of the inner side of the support base is rotatably connected to the transmission screw, the outer side of the transmission screw is threadedly connected to a displacement push plate, both ends of the displacement push plate are rotatably connected to linkage rods, and the two linkage rods are rotatably connected to one end of the two guide frames respectively.

[0011] Preferably, the stabilization maintenance component also includes an adsorption square tube, a guide tube, a connecting tube, a displacement rod and a transmission rack. The bottom end of the support base is fixedly connected to the adsorption square tube, the inner side of the support base is fixedly connected to the guide tube, one end of the guide tube is fixedly connected to the connecting tube, and the end of the connecting tube away from the guide tube is also connected to the adsorption square tube. The other end of the guide tube is slidably connected to the displacement rod, and the outer side of the displacement rod is fixedly connected to the transmission rack, one of the limit shafts is fixedly connected to the outer side of the transmission spur gear, and the transmission spur gear is also meshed with the transmission rack, and the end of the displacement rod located inside the guide tube is fixedly connected to a displacement plate.

[0012] Preferably, a carrying groove is provided inside the assembly tube, the carrying groove is a spherical structure, and an anti-slip pad is also provided inside the carrying groove.

[0013] Preferably, one end of the displacement frame is fixedly connected with a linkage pin, and the carrying tube is connected to the inside of the travel through groove through the linkage pin.

[0014] Preferably, an extension seat is fixedly connected to the middle part of one side of the support base, a guide slide rod is fixedly connected between the extension seat and the support base, and the displacement push plate is also slidably connected to the outer side of the guide slide rod.

[0015] Preferably, a plurality of adsorption holes are provided at the bottom end of the adsorption square tube, and a positioning suction cup is fixedly connected to each of the adsorption holes.

[0016] Preferably, a sealing ring is fixedly connected to the outer side of the displacement plate, and a transition fit is formed between the sealing ring and the inner wall of the guide tube.

[0017] A modeling method for a design device for an internal meshing oil pump rotor circular arc tooth profile, the steps are as follows:

[0018] The first step is to refer to the cycloid rotor parameter design calculation to determine that the inner rotor is not a cycloid rotor, and then perform the following design calculation and parametric modeling;

[0019] The second step is to design the inner rotor half tooth profile by design calculation and parametric modeling;

[0020] The third step is to mirror the half tooth profile obtained by D to obtain a single tooth profile, and then array the full tooth profile to complete the design calculation and parametric modeling of the inner rotor;

[0021] The fourth step is to obtain the outer rotor half-tooth profile that satisfies the basic law of meshing and ensures the transmission ratio by D-design calculation and parameterized modeling of the inner rotor half-tooth profile according to the basic law of meshing of tooth profiles;

[0022] Step 5: Obtain the outer rotor profile that satisfies the basic law of tooth profile engagement and ensures the transmission ratio through mirroring and arraying.

[0023] Beneficial Effects

[0024] The present invention provides a design device and a modeling method for the circular arc tooth profile of an internal meshing oil pump rotor. Compared with the prior art, it has the following beneficial effects:

[0025] The design device and modeling method of the circular arc tooth profile of the internal meshing oil pump rotor can correctly design the circular arc tooth profile of the internal meshing oil pump rotor by using conventional office software and 3D software such as Pro / E or UG through overall structural coordination, and complete parametric modeling, which greatly reduces the overall limitations and makes the design of the circular arc tooth profile of the internal meshing oil pump rotor more convenient as a whole.

[0026] The design device and modeling method of the circular arc tooth profile of the internal meshing oil pump rotor enable the all-in-one computer to be universally adjusted through the structural cooperation of the assembly cylinder and the assembly ball, so that it is convenient for personnel to operate the all-in-one computer, and the assembly ball is locked in cooperation with the locking component, so that the stability of the all-in-one computer after adjustment can be ensured.

[0027] The design device and modeling method of the circular arc tooth profile of the internal meshing oil pump rotor can form multiple supports for the all-in-one computer by utilizing the structural coordination of the stabilizing components and the structural coordination of the extended legs and the adsorption square tubes, thereby preventing the all-in-one computer from tipping over during use and greatly ensuring the stability of the all-in-one computer during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a schematic diagram of the present invention;

[0029] Figure 2 is a side view of the present invention;

[0030] Figure 3 It is a schematic diagram of the separation structure of the assembly cylinder and the assembly ball of the present invention;

[0031] Figure 4 It is a schematic diagram of the structure of the locking assembly of the present invention;

[0032] Figure 5 The present invention Figure 4 A schematic diagram of the local enlarged structure at point A in the middle;

[0033] Figure 6 It is a schematic diagram of the structure of the stabilization component of the present invention;

[0034] Figure 7 It is a schematic diagram of the connection structure between the guide frame and the linkage rod of the present invention;

[0035] Figure 8 It is a schematic diagram of the internal structure of the guide tube of the present invention;

[0036] Fig. 9 It is a schematic diagram of the connection structure between the transmission screw and the displacement push plate of the present invention;

[0037] Fig.10 It is a schematic diagram of the present invention specifying R3 and generating coordinates XO3, YO3 of O3;

[0038] Fig.11 It is a schematic diagram of connecting 4-5 points of the present invention;

[0039] Fig.12 Schematic diagram of the half-tooth profile of the outer rotor of the present invention;

[0040] Fig.13 is a schematic diagram of the half-tooth profile of the outer rotor of the present invention;

[0041] Fig.14 It is a schematic diagram of the design calculation and parameterized modeling of the outer rotor of the present invention;

[0042] Fig.15 It is a schematic diagram of the assembly of the inner and outer rotors of the present invention.

[0043] In the figure, 1, positioning bracket; 2, all-in-one computer; 3, assembly cylinder; 4, positioning seat; 5, support column; 6, assembly ball; 7, locking assembly; 8, stabilization assembly; 9, transmission shaft; 10, transmission plate; 11, travel slot; 12, limit seat; 13, linear shaft; 14, displacement frame; 15, spiral spring; 16, carrying cylinder; 17, positioning shaft; 18, positioning block; 19, stabilization spring; 20, linkage frame; 21, linkage plate; 22, support base; 23, limit shaft; 24, extension leg; 25, guide frame; 26, transmission screw; 27, displacement push plate; 28, linkage rod; 29, adsorption square tube; 30, guide cylinder; 31, connecting tube; 32, displacement rod; 33, transmission rack; 34, transmission spur gear; 35, displacement sheet. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] Embodiment 1:

[0046] See also Figure 1-9 , a design device for the circular arc tooth profile of an internal meshing oil pump rotor, comprising a positioning bracket 1 and an integrated computer 2, wherein the top of the positioning bracket 1 is fixedly connected with an assembly cylinder 3, the back of the integrated computer 2 is fixedly connected with a positioning seat 4, one end of the positioning seat 4 is fixedly connected with a support column 5, an end of the support column 5 away from the positioning seat 4 is fixed with an assembly ball 6, and the assembly ball 6 is also movably connected to the inside of the assembly cylinder 3, a locking component 7 is arranged inside the support column 5, and the locking component 7 is used to lock the position of the assembly ball 6, and a stabilization component 8 is arranged at the bottom end of the positioning bracket 1;

[0047] In detail, a carrying groove is provided inside the assembly cylinder 3, and the carrying groove is a spherical structure. An anti-skid pad is also provided inside the carrying groove. The structural characteristics of the carrying groove can perfectly match the assembly ball 6, and the anti-skid pad is provided to improve the friction between the assembly ball 6 and the assembly cylinder 3.

[0048] The locking assembly 7 includes a transmission shaft 9, a transmission plate 10, a travel slot 11, a limit seat 12, a linear shaft 13 and a displacement frame 14. The support column 5 is rotatably connected to the transmission shaft 9, and one end of the transmission shaft 9 located outside the support column 5 is fixedly connected to the transmission plate 10. The middle of the transmission plate 10 is provided with a travel slot 11. One end of the back of the integrated computer 2 is fixedly connected to the limit seat 12, and the inner side of the limit seat 12 is fixedly connected to the linear shaft 13. The outer side of the linear shaft 13 is slidably connected to the displacement frame 14, and one end of the displacement frame 14 is also movably connected to the inside of the travel slot 11. A coil spring 15 is fixedly connected between the bottom and the limit seat 12, a plurality of carrying tubes 16 are fixedly connected to the inner wall of the assembly ball 6, a positioning shaft 17 is slidably connected inside each carrying tube 16, a positioning block 18 is fixedly connected to the top of the positioning shaft 17, a stabilizing spring 19 is fixedly connected between the bottom end of the positioning block 18 and the carrying tube 16, a linkage frame 20 is fixedly connected to the bottom end of the positioning shaft 17, and one end of the transmission shaft 9 located inside the assembly ball 6 is rotatably connected to a linkage plate 21 corresponding to the plurality of linkage frames 20, and the end of the linkage plate 21 away from the transmission shaft 9 is rotatably connected to the corresponding linkage frame 20;

[0049] Among them, one end of the displacement frame 14 is fixedly connected with a linkage pin, and the carrying cylinder 16 is connected to the inside of the travel slot 11 through the linkage pin. By utilizing the structural coordination of the linkage pin, when the transmission plate 10 is pressed down, the travel slot 11 can be used to press the linkage pin, so that the displacement frame 14 is linearly displaced under the limit of the linear shaft 13;

[0050] The stabilization component 8 includes a support base 22, a limit shaft 23, an extension leg 24, a guide frame 25 and a transmission screw 26. The bottom end of the positioning bracket 1 is fixedly connected to the support base 22, and the top of one side of the support base 22 is rotatably connected to two limit shafts 23, and the bottom end of each limit shaft 23 is fixedly connected to the extension leg 24, and the middle parts of the two limit shafts 23 are fixedly connected to the guide frame 25, and the middle part of the inner side of the support base 22 is rotatably connected to the transmission screw 26, and the outer side of the transmission screw 26 is threadedly connected to the displacement push plate 27, and both ends of the displacement push plate 27 are rotatably connected to the linkage rods 28, and the two linkage rods 28 are rotatably connected to one end of the two guide frames 25 respectively;

[0051] Preferably, an extension seat is fixedly connected to the middle of one side of the support base 22, a guide slide bar is fixedly connected between the extension seat and the support base 22, and the displacement push plate 27 is also slidably connected to the outer side of the guide slide bar. By setting the guide slide bar, the displacement of the displacement push plate 27 can be effectively guided to prevent the displacement push plate 27 from rotating with the transmission screw 26;

[0052] The stabilization component 8 also includes an adsorption square tube 29, a guide tube 30, a connecting tube 31, a displacement rod 32 and a transmission rack 33. The bottom end of the support base 22 is fixedly connected to the adsorption square tube 29, the inner side of the support base 22 is fixedly connected to the guide tube 30, one end of the guide tube 30 is fixedly connected to the connecting tube 31, and the end of the connecting tube 31 away from the guide tube 30 is also connected to the adsorption square tube 29, the other end of the guide tube 30 is slidably connected to the displacement rod 32, the outer side of the displacement rod 32 is fixedly connected to the transmission rack 33, the outer side of one of the limit shaft rods 23 is fixedly connected to the transmission spur gear 34, and the transmission spur gear 34 is also meshed with the transmission rack 33, and the end of the displacement rod 32 located inside the guide tube 30 is fixedly connected to the displacement sheet 35;

[0053] Furthermore, a plurality of adsorption holes are provided at the bottom end of the adsorption square tube 29, and a positioning suction cup is fixedly connected to each adsorption hole. By utilizing the setting of the adsorption holes, when negative pressure is generated inside the adsorption square tube 29, the positioning suction cup can be sucked onto the desktop to form an anti-dumping support for the support base 22;

[0054] In detail, a sealing ring is fixedly connected to the outer side of the displacement sheet 35, and a transition fit is formed between the sealing ring and the inner wall of the guide tube 30. By setting the sealing ring, the gap between the displacement sheet 35 and the guide tube 30 can be blocked to prevent gas from escaping from the gap between the displacement sheet 35 and the guide tube 30.

[0055] In summary, a specific application of the above embodiment is: first, the office software and 3D software such as Pro / E or UG installed in the all-in-one computer 2, after the support base 22 is placed on the desktop, the transmission screw 26 is rotated, and the transmission screw 26 and the displacement push plate 27 are connected, so that the displacement push plate 27 can be displaced along the transmission screw 26, and because the linkage rod 28 is connected between the displacement push plate 27 and the guide frame 25, when the displacement push plate 27 is displaced, the linkage rod 28 can be used to pull the guide frame 25, and because the guide frame 25 is supported by the limit shaft 23, the extension legs 24 can be driven to rotate through the limit shaft 23 to change the angle between the two extension legs 24;

[0056] During the rotation of one of the limit shafts 23, the transmission spur gear 34 can be used to shift the transmission rack 33, causing the displacement rod 32 to move outward, thereby changing the position of the displacement plate 35 inside the guide tube 30, and transmitting the gas inside the adsorption square tube 29 to the inside of the guide tube 30 through the connecting tube 31, causing negative pressure to be formed inside the adsorption square tube 29, so that it is adsorbed on the desktop. Furthermore, through the coordinated arrangement of the extended legs 24 and the adsorption square tube 29, the support base 22 can be auxiliary supported to prevent the all-in-one computer 2 from tipping over, and in the process of carrying the support base 22, the extended legs 24 can be retracted by rotating the transmission screw 26 to reduce the footprint of the support base 22, so as to facilitate personnel transportation;

[0057] When a person operates the all-in-one computer 2, the transmission plate 10 can be pulled downwards. Since the transmission plate 10 is supported by the transmission shaft 9, the transmission shaft 9 can be driven to rotate. Moreover, since the linkage plate 21 is connected between the linkage frame 20 and the transmission shaft 9, when the transmission shaft 9 rotates, the linkage plate 21 can be used to synchronously pull the linkage frames 20 at multiple locations, so as to cause the positioning shaft 17 to slide, thereby driving the positioning block 18 to break away from the contact with the assembly cylinder 3, reducing the friction between the assembly ball 6 and the assembly cylinder 3, and then pushing the assembly cylinder 3 in any direction. Due to the structural characteristics, the all-in-one computer 2 can be adaptively adjusted in direction, and because when the transmission plate 10 is pressed, the displacement frame 14 can be driven to move on the outside of the linear shaft 13, and the coil spring 15 can be deformed. When the stabilizing spring 19 slides, the positioning block 18 can be used to squeeze the stabilizing spring 19. Then, after the transmission plate 10 is released, the coil spring 15 and the stabilizing spring 19 are reset, and the positioning block 18 can be driven to fit tightly with the assembly tube 3 again, thereby increasing the friction between the assembly ball 6 and the assembly tube 3, thereby locking the position of the assembly ball 6.

[0058] Embodiment 2:

[0059] This embodiment provides a modeling method for a design device for an internal meshing oil pump rotor circular arc tooth profile based on the first embodiment, and the steps are as follows:

[0060] The first step is to refer to the cycloid rotor parameter design calculation to determine that the inner rotor is not a cycloid rotor, and then perform the following design calculation and parametric modeling;

[0061] For more details, please refer to the cycloid rotor parameter design calculation as shown in the following table:

[0062]

[0063] Judgment: In the above example, k = 4.2 / 3.5 = 1.2, the inner rotor is not a cycloid;

[0064] The second step is to design the inner rotor half tooth profile by design calculation and parametric modeling;

[0065] In more detail, the specific design calculation and parametric modeling steps are as follows:

[0066] 1. Determine the coordinates of point 0: X0 = -Rf1*sin(θ), Y0 = Rf1*cos(θ), which is the intersection of the half tooth top circle.

[0067] 2. Determine the coordinates of 7 points: X7=0, Y7=Ra1, which are the intersection points of the half tooth root circle.

[0068] 3. Determine the coordinates of point O0 and point 1:

[0069] A. Determine the arc radius R0. R0 that is too small or too large will cause the next step of designing the outer rotor profile to fail. Parametric modeling is used to verify that the value of R0 is within a reasonable range.

[0070] B. Determine the angle α0 and verify through parametric modeling that α0 is within a reasonable range, otherwise the next step of designing the outer rotor profile will fail.

[0071] C. According to the tangency principle, draw a 0-1 arc curve, constrain the coordinates of points O0 and 1, and generate coordinates XO0, YO0 and X1, Y1.

[0072] 4. Determine the coordinates of points O1 and 2:

[0073] A. Specify the arc radius R1 and angle α1.

[0074] B. According to the tangency principle, draw the 1-2 arc curve, constrain the coordinates of points O1 and 2, and generate coordinates XO1, YO1 and X2, Y2.

[0075] C. Verification formula:

[0076] XO1=XO0+(R0-R1)*sin(θ+α0)

[0077] YO1=YO0-(R0-R1)*cos(θ+α0)

[0078] X2=XO1+R1*sin(θ+α0+α1)

[0079] Y2=YO1-R1*cos(θ+α0+α1)

[0080] After the parametric modeling verification is OK, proceed to the next step.

[0081] 5. Determine the coordinates of points O2 and 3:

[0082] A. Specify the arc radius R2 and angle α2.

[0083] B. According to the tangency principle, draw the 2-3 arc curve, constrain the coordinates of points O2 and 3, and generate coordinates XO2, YO2 and X3, Y3.

[0084] C. Verification formula:

[0085] XO2=XO1+(R1-R2)*sin(θ+α0+α1)

[0086] YO2=YO1-(R1-R2)*cos(θ+α0+α1)

[0087] X3=XO2+R2*sin(θ+α0+α1+α2)

[0088] Y3=YO2-R2*cos(θ+α0+α1+α2)

[0089] After the parametric modeling verification is OK, proceed to the next step.

[0090] Note that when modeling parametrically, the above steps are approximately the same as when the sketch is fully constrained. Figure 1 :

[0091] 6. Specify R3, generate the coordinates XO3, YO3 of O3, and generate arc 3-4 (α3 has no constraints), such as Fig.10 As shown:

[0092] Among them, arcs 0-1, 1-2, 2-3, 3-4, 5-6 and 6-7 are generated, and α3 is not constrained;

[0093] 7. Specify R6 and α6 to generate arc 6-7, and constrain the coordinates of point 6 and O6:

[0094] A. Determine the arc radius R6 and the angle α6.

[0095] B. According to the tangency principle, draw the 6-7 arc curve, constrain the coordinates of points O6 and 6, and generate coordinates XO6, YO6 and X6, Y6.

[0096] C. Verification formula:

[0097] XO6=0

[0098] YO6=Ra1-R6

[0099] X6=XO6-R6*sin(α6)

[0100] Y6=YO6+R6*cos(α6)

[0101] 8. Specify R5 and α5 to generate arc 5-6, and constrain the coordinates of point 5 and O5:

[0102] A. Determine the arc radius R5 and the angle α5.

[0103] B. According to the tangency principle, draw the 5-6 arc curve, constrain the coordinates of points O5 and 5, and generate coordinates XO5, YO5 and X5, Y5.

[0104] C. Verification formula:

[0105] XO5=-(R6-R5)*sin(α6))

[0106] YO5=YO6+(R6-R5)*cos(α6)

[0107] X5=XO5-R5*sin(α5+α6)

[0108] Y5=YO5+R5*cos(α5+α6)

[0109] 9. Draw an arc with three points through 4 and 5, constrain it to be tangent to the arcs 3-4 and 5-6, read α3, R4, α4, and verify the coordinates of point 4 and point O4:

[0110] A. Read α3, R4, α4

[0111] B. Verify the coordinates of 4 points, O4:

[0112] X4=XO3+R3*sin(θ+α0+α1+α2+α3)

[0113] Y4=YO3-R3*cos(θ+α0+α1+α2+α3)

[0114] C. Fig.11 As shown:

[0115] Connecting points 4-5 generates a half-tooth profile curve, and connecting points 4-5 generates a half-tooth profile curve. 4-5 is a three-point arc curve, which is tangent to the arcs 3-4 and 5-6 respectively.

[0116] D. Design calculation of the slope of the line from point O3 to point 4, KO34, and the slope of the line from point O5 to point 5, KO55:

[0117] KO34=(YO3-Y4) / (XO3-X4)

[0118] KO55=(YO5-Y5) / (XO5-X5)

[0119] E. Verify the coordinates of point O4:

[0120] XO4=((YO3-KO34*XO3)-(YO5-KO55*XO5)) / (KO55-KO34)

[0121] YO4=KO34*XO4+(YO3-KO34*XO3)

[0122] The third step is to mirror the half tooth profile obtained by D2 to obtain a single tooth profile, and then array the full tooth profile to complete the design calculation and parametric modeling of the inner rotor;

[0123] More detailed, such as Fig.12 As shown:

[0124] The fourth step is to obtain the outer rotor half-tooth profile that satisfies the basic law of meshing and guarantees the transmission ratio by using the inner rotor half-tooth profile calculated and parameterized by D2 design according to the basic law of meshing of tooth profiles;

[0125] Furthermore, the specific design calculation and parametric modeling steps are as follows:

[0126] 1. Enter basic parameters, continue with the previous example,

[0127] symbol Example describe Z1 9 Inner rotor teeth number Z2 Z1+1 Number of teeth on outer rotor e 4.2 Eccentricity R1 Z1*e Inner rotor pitch radius R2 Z2*e Outer rotor pitch radius

[0128] 2. Setting and reading of coordinate points:

[0129] A. At point P1 on the inner rotor, first read the coordinates of points 0-7;

[0130] B. Take the corresponding point P1 on the inner rotor every 0.5 degrees and read the coordinates of the corresponding point;

[0131] C. The intersection point of the normal line of point P1 and the pitch circle is N, and the corresponding coordinates are read;

[0132] D. Coordinates of point P1 (Xp1, Yp1), coordinates of point N (Xn, Yn);

[0133] The angle between point EN, the center of the inner rotor and the Y axis is set to Φ1, and the formula is as follows:

[0134] Φ1=atan(Xn / Yn)

[0135] 3. Set the point after the inner rotor rotates Φ1 as point P1':

[0136] Xp1'=Xp1*cos(Φ1)-Yp1*sin(Φ1)

[0137] Yp1'=Yp1*cos(Φ1)+Xp1*sin(Φ1)

[0138] 4. The outer rotor meshing point P2' coincides with P1', and the formula is as follows:

[0139] Xp2'=Xp1'

[0140] Yp2'=Yp1'

[0141] 5. The outer rotor is reversed by an angle of Φ2 to obtain point P2. The formula is as follows:

[0142] Transmission ratio: K12 = Z1 / Z2

[0143] Outer rotor reverse Φ2 angle: Φ2=-Φ1*k12

[0144] Xp2=Xp2'*sin(Φ2)-Yp2'*cos(Φ2)

[0145] Yp2=Yp2'*sin(Φ2)+Xp2'*cos(Φ2)-

[0146] Except for the 7 points 0-7, the above steps are repeated for the points on the inner rotor profile in sequence, so that the outer rotor half-tooth profile that satisfies the basic law of meshing and guarantees a constant transmission ratio can be obtained.

[0147] The parameter table is as follows:

[0148]

[0149]

[0150]

[0151] The outer rotor half-tooth profile obtained above is as follows Fig.13 As shown:

[0152] Step 5: Obtain the outer rotor profile that satisfies the basic law of tooth profile engagement and ensures the transmission ratio through mirroring and arraying.

[0153] More specifically, according to the matching clearance of the inner and outer rotors, the offset curve in the parametric modeling is used to obtain the offset equidistant curve, and the design calculation and parametric modeling of the outer rotor are completed, such as Fig.14 As shown;

[0154] In summary, the inner and outer rotors of the present invention are assembled as follows Fig.15 As shown:

[0155] Furthermore, the present invention can use conventional office software and 3D software such as Pro / E or UG to correctly design the circular arc tooth profile of the internal meshing oil pump rotor and complete parameterized modeling.

[0156] Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0157] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0158] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A design device for the circular arc tooth profile of an internal meshing oil pump rotor, characterized in that: The invention comprises a positioning bracket (1) and an all-in-one computer (2), wherein the top of the positioning bracket (1) is fixedly connected to an assembly tube (3), the back of the all-in-one computer (2) is fixedly connected to a positioning seat (4), one end of the positioning seat (4) is fixedly connected to a support column (5), an assembly ball (6) is fixed to the end of the support column (5) away from the positioning seat (4), and the assembly ball (6) is also movably connected to the inside of the assembly tube (3), a locking component (7) is arranged inside the support column (5), and the locking component (7) is used to lock the position of the assembly ball (6), and a stabilization component (8) is arranged at the bottom end of the positioning bracket (1).

2. The design device for the circular arc tooth profile of an internal meshing oil pump rotor according to claim 1, characterized in that: The locking assembly (7) comprises a transmission shaft (9), a transmission plate (10), a travel slot (11), a limit seat (12), a linear shaft (13) and a displacement frame (14); the support column (5) is rotatably connected to the transmission shaft (9); one end of the transmission shaft (9) located outside the support column (5) is fixedly connected to the transmission plate (10); a travel slot (11) is provided in the middle of the transmission plate (10); one end of the back of the integrated computer (2) is fixedly connected to the limit seat (12); the inner side of the limit seat (12) is fixedly connected to the linear shaft (13); the outer side of the linear shaft (13) is slidably connected to the displacement frame (14); one end of the displacement frame (14) is also movably connected to the inner side of the travel slot (11); A coil spring (15) is fixedly connected between the bottom of the assembly ball (14) and the limit seat (12), a plurality of carrying tubes (16) are fixedly connected to the inner wall of the assembly ball (6), a positioning shaft (17) is slidably connected inside each of the carrying tubes (16), a positioning block (18) is fixedly connected to the top of the positioning shaft (17), a stabilizing spring (19) is fixedly connected between the bottom end of the positioning block (18) and the carrying tube (16), a linkage frame (20) is fixedly connected to the bottom end of the positioning shaft (17), one end of the transmission shaft (9) located inside the assembly ball (6) is rotatably connected to a linkage plate (21) corresponding to the plurality of linkage frames (20), and the end of the linkage plate (21) away from the transmission shaft (9) is rotatably connected to the corresponding linkage frame (20).

3. The device for designing circular arc tooth profile of an internal meshing oil pump rotor according to claim 1, characterized in that: The stabilization component (8) comprises a support base (22), a limiting shaft (23), an extension leg (24), a guide frame (25) and a transmission screw (26); the bottom end of the positioning bracket (1) is fixedly connected to the support base (22); the top of one side of the support base (22) is rotatably connected to two limiting shafts (23); the bottom end of each limiting shaft (23) is fixedly connected to the extension leg (24); the middle parts of the two limiting shafts (23) are fixedly connected to the guide frame (25); the middle part of the inner side of the support base (22) is rotatably connected to the transmission screw (26); the outer side of the transmission screw (26) is threadedly connected to a displacement push plate (27); both ends of the displacement push plate (27) are rotatably connected to linkage rods (28), and the two linkage rods (28) are rotatably connected to one end of the two guide frames (25), respectively.

4. The device for designing circular arc tooth profile of an internal meshing oil pump rotor according to claim 3, characterized in that: The stabilization component (8) also includes an adsorption square tube (29), a guide tube (30), a connecting tube (31), a displacement rod (32) and a transmission rack (33). The bottom end of the support base (22) is fixedly connected to the adsorption square tube (29), the inner side of the support base (22) is fixedly connected to the guide tube (30), one end of the guide tube (30) is fixedly connected to the connecting tube (31), the end of the connecting tube (31) away from the guide tube (30) is also connected to the adsorption square tube (29), the other end of the guide tube (30) is slidably connected to the displacement rod (32), the outer side of the displacement rod (32) is fixedly connected to the transmission rack (33), the outer side of one of the limit shaft rods (23) is fixedly connected to a transmission spur gear (34), and the transmission spur gear (34) is also meshed with the transmission rack (33), and the end of the displacement rod (32) located inside the guide tube (30) is fixedly connected to a displacement plate (35).

5. The device for designing circular arc tooth profile of an internal meshing oil pump rotor according to claim 1, characterized in that: The assembly cylinder (3) is provided with a carrying groove inside, the carrying groove is a spherical structure, and an anti-slip pad is also arranged inside the carrying groove.

6. The device for designing circular arc tooth profile of an internal meshing oil pump rotor according to claim 2, characterized in that: One end of the displacement frame (14) is fixedly connected with a linkage pin, and the carrying cylinder (16) is connected to the interior of the travel slot (11) via the linkage pin.

7. The device for designing circular arc tooth profile of an internal meshing oil pump rotor according to claim 3, characterized in that: An extension seat is fixedly connected to the middle of one side of the support base (22), a guide slide rod is fixedly connected between the extension seat and the support base (22), and the displacement push plate (27) is also slidably connected to the outer side of the guide slide rod.

8. The device for designing circular arc tooth profile of an internal meshing oil pump rotor according to claim 4, characterized in that: A plurality of adsorption holes are provided at the bottom end of the adsorption square tube (29), and a positioning suction cup is fixedly connected to each of the adsorption holes.

9. The device for designing circular arc tooth profile of an internal meshing oil pump rotor according to claim 4, characterized in that: A sealing ring is fixedly connected to the outer side of the displacement plate (35), and a transition fit is formed between the sealing ring and the inner wall of the guide tube (30). Transmission plate (10). A modeling method for a design device for an internal meshing oil pump rotor circular arc tooth profile, characterized in that the steps are as follows: The first step is to refer to the cycloid rotor parameter design calculation to determine that the inner rotor is not a cycloid rotor, and then perform the following design calculation and parametric modeling; The second step is to design the inner rotor half tooth profile by design calculation and parametric modeling; The third step is to mirror the half tooth profile obtained by D2 to obtain a single tooth profile, and then array the full tooth profile to complete the design calculation and parametric modeling of the inner rotor; The fourth step is to obtain the outer rotor half-tooth profile that satisfies the basic law of meshing and guarantees the transmission ratio by using the inner rotor half-tooth profile calculated and parameterized by D2 design according to the basic law of meshing of tooth profiles; Step 5: Obtain the outer rotor profile that satisfies the basic law of tooth profile engagement and ensures the transmission ratio through mirroring and arraying.

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