Hydraulic torque converter pump impeller

Abstract

The utility model relates to a hydraulic torque converter and aims to solve the technical problems that blades of an existing hydraulic torque converter pump impeller are large in twisting degree, and simulation manufacturing and machining of blade molds and mold splitting during blade casting are not facilitated. The utility model provides a pump impeller of a hydraulic torque converter. The pump impeller comprises an inner ring shell, a blade group and an outer ring shell, the blade group comprises 33 blades distributed around the central axis of the outer ring shell; the side line of the contact surface of the blade and the outer wall of the inner ring shell is defined as an inner ring blade molded line; the side lines of the contact surfaces of the blades and the inner wall of the outer ring shell are outer ring blade molded lines; the projection, on the plane, of the inner ring blade molded line of the same blade is located in the projection, on the plane, of the outer ring blade molded line. A circulating circle is formed between the inner ring shell molded surface and the outer ring shell molded surface; the outer diameter of the circulating circle is 420 mm, and the inner diameter of the circulating circle is 151.1 mm; the starting radius of the molded line of the inner ring blade on the inner ring flow line is 127.437 mm, and the ending radius of the molded line of the inner ring blade on the inner ring flow line is 186.416 mm; the starting radius of the outer ring blade molded line on the outer ring circulation line is 117.958 mm, and the ending radius of the outer ring blade molded line on the outer ring circulation line is 206.427 mm.

Description

Technical Field

[0001] The utility model relates to a hydraulic torque converter, in particular to a hydraulic torque converter pump wheel. Background Art

[0002] The torque converter pump wheel is one of the key components of the torque converter. The manufacturing accuracy of its blade shape has a strong influence on the flow field inside the torque converter. At present, the combined sand mold casting method is usually used to manufacture the one-piece torque converter pump wheel. Since the errors caused by splicing cannot be avoided, the manufacturing accuracy of the blades will be reduced, which will further affect the pitch ratio, nominal torque and efficiency in the torque converter.

[0003] The Chinese patent document with the publication number CN108980296A discloses a hydraulic torque converter pump wheel structure, characterized in that: the hydraulic torque converter pump wheel includes an inner ring, an outer ring, and 23 uniformly distributed identical blades connected to the inner ring and the outer ring near the center of the circulation circle; the inner ring and the outer ring form a circulation circular cavity of an approximately circular structure, the circulation circular cavity is arranged in an annular manner from the rotation center to the outside, and the liquid flows outward from the center along the circulation circular cavity; the 23 blades are evenly arranged in the circulation circular cavity in a 360° circumferential direction with the central axis as the center; the outer ring arc surface of the inner ring is tangent to two arcs with radii R26mm and R16.6mm, and rotates along the central axis to form an approximate outer ring arc surface, the center of the R26mm arc is designed on the center line of the circulation circle, and the R16.6mm deviates from the center line of the circulation circle by 8mm and is tangent to the R26mm; the inner ring arc surface of the outer ring is tangent to two arcs with radii R55.5mm and R45.5mm, and rotates along the central axis to form an approximate outer ring arc surface, the center of the R26mm arc is designed on the center line of the circulation circle, and the R16.6mm deviates from the center line of the circulation circle by 8mm and is tangent to the R26mm; the inner ring arc surface of the outer ring is tangent to two arcs with radii R55.5mm and R45.5mm, and rotates along the central axis to form an outer ring arc surface. The central axis rotates to form an approximate inner ring arc surface, the center of the R55.5mm arc is designed on the center line of the circulation circle, and the R45.5mm deviates from the center line of the circulation circle by 10mm and is tangent to the R55.5mm; the relative radii of the designed streamlines of the inner and outer rings are rB1=0.6462, rB2=1; the relative axial surface areas are aB1=0.7654, aB2=0.8497; the blade includes a blade body, and the blade body forms a three-dimensional streamlined curved surface structure from the inlet end to the outlet end along the liquid flow direction; the inlet angle of the blade body along the middle streamline is 113±1°, and the outlet angle is 110±1°; the inner ring arc surface of the blade is connected to the outer ring arc surface 1-1 of the inner ring, and the outer ring arc surface of the blade is connected to the inner ring arc surface of the outer ring; the inlet thickness of the inner ring of the blade is 4.3mm, and the outlet thickness is 2.2mm; the inlet thickness of the outer ring of the blade is 4.5mm, and the outlet thickness is 1.3mm, and the blade has a smooth transition between the inner ring and the outer ring according to the different blade thicknesses. However, the technical solution has the disadvantage that the blade is twisted to a large extent, which is not conducive to the simulation manufacturing process of the blade mold and the mold separation during blade casting. Utility Model Content

[0004] The utility model aims to solve the technical problems that the blades of the existing torque converter pump wheel have low precision or large distortion, which is not conducive to the simulation manufacturing and processing of the blade mold and the mold separation during blade casting, and provide a torque converter pump wheel.

[0005] In order to solve the above technical problems, the technical solutions provided by the utility model are as follows:

[0006] A hydraulic torque converter pump wheel, which is special in that:

[0007] It comprises an inner ring shell, a blade group and an outer ring shell which are connected in sequence from the inside to the outside, wherein the inner ring shell is coaxially arranged with the outer ring shell; the blade group comprises 33 blades which are evenly distributed along the circumference around the central axis of the outer ring shell;

[0008] definition:

[0009] The outer edge of the inner ring shell along the axial section is the inner ring streamline, and the inner ring streamline rotates around the central axis of the outer ring shell to form the inner ring shell profile;

[0010] The inner edge line of the outer ring shell along the axial section is the outer ring streamline, and the outer ring streamline rotates around the central axis of the outer ring shell to form the outer ring shell profile;

[0011] The edge line of the contact surface between the blade and the outer wall of the inner ring shell is the inner ring blade profile line; the edge line of the contact surface between the blade and the inner wall of the outer ring shell is the outer ring blade profile line;

[0012] Then: the projection of the inner ring blade profile of the same blade on the plane perpendicular to the central axis of the outer ring housing is within the projection of the outer ring blade profile on the plane;

[0013] A circulation circle is formed between the inner ring shell profile and the outer ring shell profile; the outer diameter of the circulation circle is 420 mm, and the inner diameter is 151.1 mm;

[0014] The starting radius of the inner ring blade profile on the inner circulation line is 127.437mm, and the ending radius is 186.416mm; the starting radius of the outer ring blade profile on the outer circulation line is 117.958mm, and the ending radius is 206.427mm.

[0015] Furthermore, the generalized inlet angle, generalized outlet angle and rotation angle of the blade on the side close to the outer wall of the inner ring shell are 114.5°, 75.1° and -4.8° respectively;

[0016] The generalized inlet angle, generalized outlet angle and rotation angle of the blade on the side close to the inner wall of the outer ring shell are 125.8°, 48.3° and -12.7° respectively.

[0017] Furthermore, the installation deflection angle of the inner ring blade profile relative to the outer ring blade profile is 0.051 rad.

[0018] Furthermore, the arc radii of the inner ring blade profile head and the inner ring blade profile tail of the inner ring blade profile are 1.3 mm and 1.36 mm respectively; the maximum size of the middle part of the inner ring blade profile is 6.53 mm;

[0019] The arc radii of the outer ring blade profile head and the outer ring blade profile tail are 1.88mm and 1.3mm respectively; the maximum size of the middle part of the outer ring blade profile is 10.37mm.

[0020] Further, the cross section of the circulation circle is oval;

[0021] The intermediate streamline between the inner circular streamline and the outer circular streamline is composed of a first circular arc, a second circular arc, and two tangent lines tangent to the first circular arc and the second circular arc;

[0022] The radius of the first arc is 42.5 mm, and the radius of the second arc is 43.14 mm; the distance between the centers of the first arc and the second arc is 14.657 mm;

[0023] The included angles between the two tangent lines and the line connecting the center of the first arc and the center of the second arc are both 87.5°.

[0024] Compared with the prior art, the utility model has the following beneficial effects:

[0025] 1. The torque converter pump wheel provided by the utility model can reduce the degree of distortion of the blades, facilitate one-way demoulding along the central axis of the outer ring shell, and can simultaneously design the metal molds of 33 blades on the same metal mold base, so that the 33 blade molds become a whole. In this way, when casting the sand core mold, the integral sand core mold can be cast at one time, eliminating the steps of combining the sand core or drawing the mold, and improving the casting accuracy of the blades.

[0026] 2. The torque converter pump wheel provided by the utility model helps to further reduce the degree of blade distortion by defining the generalized inlet angle, generalized outlet angle and rotation angle of the blades, as well as the dimensions of the inner ring blade profile and the outer ring blade profile, which is beneficial to the simulation manufacturing and processing of the torque converter pump wheel mold and reduces the difficulty of blade casting parting. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a three-dimensional structural schematic diagram of an embodiment of the utility model;

[0028] Figure 2 It is a cross-sectional view of an embodiment of the utility model along the radial direction;

[0029] Figure 3 It is a schematic diagram of the structure of the inner ring streamline, the outer ring streamline and the middle streamline in the embodiment of the utility model;

[0030] Figure 4 It is a schematic diagram of the three-dimensional structure of the blade in the embodiment of the utility model;

[0031] Figure 5 It is a structural schematic diagram of the inner ring blade profile and the outer ring blade profile of the blade in the embodiment of the utility model projected on the same plane;

[0032] Figure 6 It is a structural schematic diagram of the inner loop streamline and the outer loop streamline in the embodiment of the utility model;

[0033] Figure 7 It is a schematic diagram of the generalized inlet angle, generalized outlet angle and rotation angle of the blade in the embodiment of the utility model;

[0034] Explanation of the reference numerals: 1-inner ring casing, 2-blades, 3-outer ring casing, 4-inner ring streamline, 5-inner ring casing profile, 6-outer ring streamline, 7-outer ring casing profile, 8-inner ring blade profile, 81-inner ring blade profile head, 82-inner ring blade profile tail, 9-outer ring blade profile, 91-outer ring blade profile head, 92-outer ring blade profile tail, 10-circulation circle, 11-intermediate streamline. DETAILED DESCRIPTION

[0035] The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions in the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0036] like Figure 1 and Figure 2 As shown, a torque converter pump wheel includes an inner ring shell 1, a blade group and an outer ring shell 3 connected in sequence from the inside to the outside, and the inner ring shell 1 is coaxially arranged with the outer ring shell 3; the blade group includes 33 blades 2 uniformly distributed along the circumference around the central axis of the outer ring shell 3.

[0037] In order to reduce the degree of distortion of blade 2, reduce the difficulty of simulation manufacturing of the torque converter pump wheel mold, and increase the mold parting speed, the parameters of the torque converter pump wheel are defined as follows:

[0038] definition:

[0039] like Figure 3 As shown, the outer edge line of the inner ring housing 1 along the axial section is the inner ring streamline 4, and the inner ring streamline 4 rotates around the central axis of the outer ring housing 3 to form the inner ring housing profile 5;

[0040] The inner edge line of the outer ring shell 3 along the axial section is the outer ring streamline 6, and the outer ring streamline 6 rotates around the central axis of the outer ring shell 3 to form the outer ring shell profile 7;

[0041] like Figure 2 and Figure 4 As shown, the edge line of the contact surface between the blade 2 and the outer wall of the inner ring shell 1 is the inner ring blade profile line 8; the edge line of the contact surface between the blade 2 and the inner wall of the outer ring shell 3 is the outer ring blade profile line 9;

[0042] like Figure 5 As shown, then: the projection of the inner ring blade profile 8 of the same blade 2 on a plane perpendicular to the central axis of the outer ring housing (3) is located within the projection of the outer ring blade profile 9 on the plane;

[0043] like Figure 3 As shown, a circulation circle 10 is formed between the inner ring housing profile 5 and the outer ring housing profile 7; the outer diameter D of the circulation circle 10 is 420 mm, and the inner diameter d is 151.1 mm;

[0044] like Figure 6 As shown, the starting radius R of the inner ring blade profile 8 on the inner ring streamline 4 in-s The end radius R is 127.437 mm. in-f The starting radius R of the outer ring blade profile 9 on the outer ring streamline 6 is 186.416 mm. out-s The end radius R is 117.958 mm. out-f It is 206.427mm.

[0045] like Figure 7 As shown, the generalized inlet angle α of the blade 2 close to the outer wall of the inner ring shell 1 is in 、Generalized outlet angle α out and rotation angle γ are 114.5°, 75.1°, and −4.8°, respectively;

[0046] The generalized inlet angle α of the blade 2 close to the inner wall of the outer ring shell 3 in 、Generalized outlet angle α out and the rotation angle γ are 125.8°, 48.3°, and -12.7°, respectively.

[0047] like Figure 5 As shown, the installation deflection angle β of the inner ring blade profile 8 relative to the outer ring blade profile 9 p It is 0.051rad.

[0048] like Figure 4As shown, the arc radii of the inner ring blade profile line head 81 and the inner ring blade profile line tail 82 of the inner ring blade profile line 8 are 1.3 mm and 1.36 mm respectively; the maximum size of the middle part of the inner ring blade profile line 8 is 6.53 mm;

[0049] The arc radii of the outer ring blade profile line head 91 and the outer ring blade profile line tail 92 of the outer ring blade profile line 9 are 1.88 mm and 1.3 mm respectively; the maximum dimension of the middle part of the outer ring blade profile line 9 is 10.37 mm.

[0050] like Figure 3 As shown, the cross section of the circulation circle 10 is oval;

[0051] The middle streamline 11 between the inner circular streamline 4 and the outer circular streamline 6 is composed of a first circular arc, a second circular arc, and two tangent lines tangent to the first circular arc and the second circular arc;

[0052] The radius of the first arc is r o1 is 42.5 mm, and the radius of the second arc is r o2 The distance between the centers of the first arc and the second arc is the distance R from the center of the first arc to the center axis of the outer ring housing 3. O1 The distance R from the center of the second arc to the center axis of the outer ring housing 3 O2 The difference, R O1 -R O2 =14.657mm; Angle α between the two tangent lines and the line connecting the center of the first arc and the center of the second arc line Both are 87.5°.

[0053] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or replacements within the technical scope disclosed in the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope recorded in the claims.

Claims

1. A torque converter pump wheel, characterized in that: It comprises an inner ring shell (1), a blade group and an outer ring shell (3) which are connected in sequence from the inside to the outside, wherein the inner ring shell (1) and the outer ring shell (3) are coaxially arranged; the blade group comprises 33 blades (2) which are evenly distributed along the circumference around the central axis of the outer ring shell (3); definition: The outer edge line of the inner ring shell (1) along the axial section is an inner ring streamline (4), and the inner ring streamline (4) rotates around the central axis of the outer ring shell (3) to form an inner ring shell profile (5); The inner edge line of the outer ring shell (3) along the axial section is an outer ring streamline (6), and the outer ring streamline (6) rotates around the central axis of the outer ring shell (3) to form an outer ring shell profile (7); The edge line of the contact surface between the blade (2) and the outer wall of the inner ring shell (1) is the inner ring blade profile line (8); the edge line of the contact surface between the blade (2) and the inner wall of the outer ring shell (3) is the outer ring blade profile line (9); Then: the projection of the inner ring blade profile (8) of the same blade (2) on a plane perpendicular to the central axis of the outer ring housing (3) is located within the projection of the outer ring blade profile (9) on the plane; A circulation circle (10) is formed between the inner ring housing profile (5) and the outer ring housing profile (7); the outer diameter of the circulation circle (10) is 420 mm, and the inner diameter is 151.1 mm; The inner ring blade profile (8) has a starting radius of 127.437 mm and an ending radius of 186.416 mm on the inner ring flow line (4); The starting radius of the outer ring blade profile (9) on the outer ring streamline (6) is 117.958 mm, and the ending radius is 206.427 mm.

2. The torque converter pump wheel according to claim 1, characterized in that: The generalized inlet angle, generalized outlet angle and rotation angle of the blade (2) on the side close to the outer wall of the inner ring housing (1) are 114.5°, 75.1° and -4.8° respectively; The generalized inlet angle, generalized outlet angle and rotation angle of the blade (2) on the side close to the inner wall of the outer ring shell (3) are 125.8°, 48.3° and -12.7° respectively.

3. The torque converter pump wheel according to claim 1, characterized in that: The installation deflection angle of the inner ring blade profile (8) relative to the outer ring blade profile (9) is 0.051 rad.

4. The torque converter pump wheel according to claim 1, characterized in that: The arc radii of the inner ring blade profile head (81) and the inner ring blade profile tail (82) of the inner ring blade profile (8) are 1.3 mm and 1.36 mm respectively; the maximum size of the middle part of the inner ring blade profile (8) is 6.53 mm; The arc radii of the outer ring blade profile head (91) and the outer ring blade profile tail (92) of the outer ring blade profile (9) are 1.88 mm and 1.3 mm respectively; the maximum size of the middle part of the outer ring blade profile (9) is 10.37 mm.

5. The torque converter pump wheel according to claim 1, characterized in that: The cross section of the circulation circle (10) is oval; The intermediate streamline (11) between the inner circular streamline (4) and the outer circular streamline (6) is composed of a first circular arc, a second circular arc, and two tangent lines tangent to the first circular arc and the second circular arc; The radius of the first arc is 42.5 mm, and the radius of the second arc is 43.14 mm; the distance between the centers of the first arc and the second arc is 14.657 mm; The included angles between the two tangent lines and the line connecting the center of the first arc and the center of the second arc are both 87.5°.

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