US20190128127A1 - Polymeric compressor wheel assembly - Google Patents
Polymeric compressor wheel assembly Download PDFInfo
- Publication number
- US20190128127A1 US20190128127A1 US16/172,931 US201816172931A US2019128127A1 US 20190128127 A1 US20190128127 A1 US 20190128127A1 US 201816172931 A US201816172931 A US 201816172931A US 2019128127 A1 US2019128127 A1 US 2019128127A1
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- United States
- Prior art keywords
- compressor wheel
- shaft
- coupling member
- bore
- sectional configuration
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
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- 238000010168 coupling process Methods 0.000 claims abstract description 124
- 238000005859 coupling reaction Methods 0.000 claims abstract description 124
- 239000000463 material Substances 0.000 claims abstract description 29
- 230000004323 axial length Effects 0.000 claims description 23
- 239000011800 void material Substances 0.000 claims description 2
- 239000003570 air Substances 0.000 description 15
- 239000007789 gas Substances 0.000 description 8
- 238000000034 method Methods 0.000 description 5
- 239000000411 inducer Substances 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 3
- 230000000295 complement effect Effects 0.000 description 3
- 238000001746 injection moulding Methods 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
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- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 239000004677 Nylon Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000012080 ambient air Substances 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 230000004044 response Effects 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
- F01D5/12—Blades
- F01D5/28—Selecting particular materials; Particular measures relating thereto; Measures against erosion or corrosion
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
- F01D5/02—Blade-carrying members, e.g. rotors
- F01D5/025—Fixing blade carrying members on shafts
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/02—Selection of particular materials
- F04D29/023—Selection of particular materials especially adapted for elastic fluid pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
- F04D29/266—Rotors specially for elastic fluids mounting compressor rotors on shafts
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
- F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
- F04D29/284—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for compressors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D1/00—Couplings for rigidly connecting two coaxial shafts or other movable machine elements
- F16D1/10—Quick-acting couplings in which the parts are connected by simply bringing them together axially
- F16D1/108—Quick-acting couplings in which the parts are connected by simply bringing them together axially having retaining means rotating with the coupling and acting by interengaging parts, i.e. positive coupling
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
- F01D5/02—Blade-carrying members, e.g. rotors
- F01D5/04—Blade-carrying members, e.g. rotors for radial-flow machines or engines
- F01D5/043—Blade-carrying members, e.g. rotors for radial-flow machines or engines of the axial inlet- radial outlet, or vice versa, type
- F01D5/048—Form or construction
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2220/00—Application
- F05D2220/40—Application in turbochargers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2250/00—Geometry
- F05D2250/10—Two-dimensional
- F05D2250/12—Two-dimensional rectangular
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2250/00—Geometry
- F05D2250/10—Two-dimensional
- F05D2250/12—Two-dimensional rectangular
- F05D2250/121—Two-dimensional rectangular square
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2250/00—Geometry
- F05D2250/10—Two-dimensional
- F05D2250/13—Two-dimensional trapezoidal
- F05D2250/131—Two-dimensional trapezoidal polygonal
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2260/00—Function
- F05D2260/30—Retaining components in desired mutual position
- F05D2260/31—Retaining bolts or nuts
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2300/00—Materials; Properties thereof
- F05D2300/40—Organic materials
- F05D2300/43—Synthetic polymers, e.g. plastics; Rubber
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D1/00—Couplings for rigidly connecting two coaxial shafts or other movable machine elements
- F16D1/10—Quick-acting couplings in which the parts are connected by simply bringing them together axially
- F16D2001/102—Quick-acting couplings in which the parts are connected by simply bringing them together axially the torque is transmitted via polygon shaped connections
Definitions
- This disclosure relates to compressor wheels, and more particularly, to a system and method for compressor wheel retention using a squared nut.
- Turbochargers are forced-induction devices that are utilized to increase the pressure of the intake air provided to an engine.
- a compressor wheel is attached to a shaft, which is rotated, for example, by an electric motor, exhaust gas from the engine, or both.
- the compressor wheel thereby, pressurizes ambient intake air and supplies pressurized intake air to the engine.
- the engine may have increased power output compared to an otherwise comparable a naturally-aspirated engine.
- Compressor wheels are typically made of metal materials, such as aluminum. Compressor wheels may, alternatively, be made of polymeric materials that made provide various advantages (e.g., lower moment of inertia, different manufacturing methods).
- compressor wheels Disclosed herein are aspects, features, elements, implementations, and embodiments of compressor wheels and, in particular, polymeric compressor wheels and compressor wheel assemblies comprising the same.
- a compressor wheel assembly includes a compressor wheel and a coupling member.
- the compressor wheel is formed of a polymeric material.
- the compressor wheel includes a hub, blades extending from a forward surface of the hub, and a shaft coupling portion extending axially rearward from a rearward surface of the hub.
- the shaft coupling portion includes a bore extending therethrough and having a polygonal cross-sectional configuration.
- the coupling member includes a head and a body extending axially from the head. The head is received against a forward end of the compressor wheel and the body extends through the bore.
- the body has another polygonal cross-sectional configuration for transferring torque from the coupling member to the compressor wheel.
- the compressor wheel assembly may further include a shaft.
- the body of the coupling member includes a hollow interior.
- the shaft includes a forward portion that is threadably received in the hollow interior to couple the shaft to the coupling member and transfer torque thereto as the shaft is rotated by a drive source.
- the compressor wheel assembly may further include a collar disposed around and engaging the shaft coupling portion.
- the collar is formed of a material that is stiffer than the polymeric material.
- FIG. 1 generally illustrates a perspective partial cross-section view of a turbocharger according to the principles of the present disclosure.
- FIG. 2 generally illustrates a perspective view of a compressor wheel assembly according to the principles of the present disclosure.
- FIG. 3 generally illustrates a perspective cross-section of an exploded view of a compressor wheel assembly according to the principles of the present disclosure.
- FIG. 4 generally illustrates a perspective cross-section of a compressor wheel assembly according to the principles of the present disclosure.
- FIG. 5 generally illustrates a perspective cross-section of a compressor wheel assembly including a collar according to the principles of the present disclosure.
- a compressor wheel and a compressor wheel assembly which may be used in a turbocharger.
- the compressor wheel is formed of a polymeric material and is connected to a shaft with a coupling member to, thereby, form a compressor wheel assembly.
- the compressor wheel includes a central bore in which is received the coupling member, which is in turn coupled to the shaft.
- the central bore and the coupling member have complementary polygonal cross-sectional shapes that allow torque transfer therebetween.
- the central bore and the coupling member may also have complementary axial lengths, and the coupling member and the shaft may include opposing surfaces, which cooperatively allow the compressor wheel to be held axially therebetween.
- FIG. 1 generally illustrates a perspective partial cross-section view of a turbocharger 100 according to the principles of the present disclosure.
- the turbocharger 100 is an exhaust-gas driven forced induction device that is utilized in conjunction with an internal combustion engine (not shown).
- the turbocharger 100 includes a turbine wheel 110 .
- the turbine wheel 110 is located in a turbine housing 120 .
- the turbine housing 120 includes an exhaust gas inlet 122 for receiving exhaust gas from the internal combustion engine. Exhaust gases are routed from the exhaust gas inlet 122 to the turbine wheel 110 before exiting the turbine housing 120 at an exhaust gas outlet 123 .
- a wastegate 124 may be mounted in the turbine housing 120 to allow some or all of the exhaust gas to bypass the turbine wheel 110 .
- the wastegate 124 is movable between an open position and a closed position by an electric linear actuator 130 .
- the turbocharger includes a compressor wheel assembly including a compressor wheel 140 .
- the compressor wheel 140 is located in a compressor housing 150 .
- the compressor housing 150 includes an air inlet 152 and a volute in communication with an air outlet (not shown).
- Intake air is routed from the air inlet 152 to the compressor wheel 140 , where the intake air is pressurized by rotation of the compressor wheel 140 .
- the compressed air enters the volute and then exits the compressor housing 150 via the air outlet to be supplied to the internal combustion engine.
- Rotation of the compressor wheel 140 is driven by rotation of the turbine wheel 110 .
- the turbine wheel 110 and the compressor wheel 140 are each connected to a shaft 160 .
- the shaft 160 can be a substantially rigid member, and each of the turbine wheel 110 and the compressor wheel 140 can be connected to the shaft 160 in a manner that prevents rotation of the turbine wheel 110 and the compressor wheel 140 with respect to the shaft 160 .
- the compressor wheel 140 can rotate in unison with the turbine wheel 110 in response to rotation of the turbine wheel 110 .
- the shaft 160 is supported within a bearing housing 170 such that it is able to rotate freely with respect to the bearing housing 170 at a high rotational speed.
- the bearing housing 170 , the turbine housing 120 , and the compressor housing 150 are all arranged along an axis of rotation of the shaft 160 .
- the bearing housing 170 is positioned between the turbine housing 120 and the compressor housing 150 , with a first end of the bearing housing 170 being connected to the turbine housing 120 and a second end of the bearing housing 170 being connected to the compressor housing 150 .
- the bearing housing 170 can incorporate lubrication and/or cooling features.
- FIGS. 2-5 generally illustrate a compressor wheel assembly 200 according to the principles of the present disclosure.
- the compressor wheel assembly 200 may be associated with a turbocharger, such as the turbocharger 100 of FIG. 1 , or another forced induction device (e.g., driven by the exhaust, an electric motor, and/or another suitable drive source).
- a turbocharger such as the turbocharger 100 of FIG. 1
- another forced induction device e.g., driven by the exhaust, an electric motor, and/or another suitable drive source.
- the compressor wheel assembly 200 generally includes a compressor wheel 140 (e.g., that shown in FIG. 1 ), the shaft 160 , and a coupling member 230 that is adapted to secure the compressor wheel 140 to the shaft 160 .
- the compressor wheel 140 is formed a polymeric material, such as glass-filled nylon, plastic, or may comprise other suitable materials.
- the compressor wheel 140 may, for example, be injection molded.
- the compressor wheel 140 may also be referred to as a polymeric compressor wheel.
- the compressor wheel 140 generally includes a hub 202 , blades 204 , and a shaft coupling portion 206 having a bore 208 extending axially therethrough.
- the hub 202 Moving from an inducer end of the compressor wheel 140 (e.g., near the air inlet 152 ) to an exducer end (e.g., near the volute), the hub 202 widens with an outer surface 210 (e.g., forward surface) that is convex in cross-section (e.g., moving from a near vertical surface to a near horizontal surface).
- the hub 202 may, for example, have generally constant wall thickness, which may be advantageous for manufacturing (e.g., injection molding).
- the blades 204 are generally configured to draw ambient air into the compressor housing 150 , compress the air, and expel compressed air to the volute for supply to the engine.
- the blades 204 disposed on the outer surface 210 of the hub 202 and extend away (e.g., radially and/or axially) therefrom.
- the blades 204 may be identical or substantially identical to one another.
- each of the blades 204 may comprise identical or substantially identical shapes and dimensions.
- the blades 204 may have different shape and/or sizes (e.g., larger and smaller blades).
- the blades 204 are formed integrally with the hub 202 , for example, during the injection molding process.
- the shaft coupling portion 206 extends axially rearward from an inner surface (not labeled; e.g., rearward surface) of the hub 202 .
- the shaft coupling portion 206 is, for example, formed as a protrusion that extends axially rearward (i.e., away from an inducer end of the compressor wheel 140 ). Moving rearward, the shaft coupling portion 206 is spaced apart radially from the inner surface of the hub 202 at increasing distances.
- the shaft coupling portion 206 includes the bore 208 extending axially therethrough, which, as discussed in further detail below, allows receipt of the coupling member 230 for coupling the compressor wheel 140 to the shaft 160 .
- the shaft coupling portion 206 is parallel (e.g., concentric) with the shaft 160 when coupled thereto. While shown as being generally cylindrical, the shaft coupling portion 206 may have different configurations (e.g., having a non-circular cross-sectional shape and/or having different cross-sectional shapes and/or sizes moving axially therealong).
- the shaft coupling portion 206 is formed integrally with the hub 202 , for example, during the injection molding process.
- the bore 208 and the coupling member 230 are cooperatively configured to couple the compressor wheel 140 to the shaft 160 and to transfer torque therebetween. More particularly, the bore 208 and the coupling member 230 have complementary cross-sectional shapes, which allow receipt of the coupling member 230 axially into the bore 208 and which transfer force between engaging surfaces thereof.
- the bore 208 extends axially entirely through the compressor wheel 140 , so as to have a forward opening 212 and a rearward opening 214 .
- the forward opening 212 of the bore 208 is positioned at a forward end 216 (e.g., first or inducer end) of the compressor wheel 140 ), which may form a planar surface extending radially inward from the outer surface 210 of the hub 202 .
- the rearward opening 214 of the bore 208 is positioned at a rearward end 218 of the shaft coupling portion 206 .
- the rearward end 218 of the shaft coupling portion 206 may also form a planar surface.
- the bore 208 includes a polygonal cross-sectional configuration (e.g., shape), such as a rectangular cross-sectional configuration (e.g., square, as shown). That is, the bore 208 has an inner periphery having interior surfaces 220 (e.g., straight or planar interior surfaces) that form the cross-sectional configuration.
- the bore 208 may include other cross-sectional configurations, such as, a triangular cross-sectional configuration, a pentagonal cross-sectional configuration, a hexagonal cross-sectional configuration, an octagonal cross-sectional configuration, or other suitable cross-sectional configuration.
- the polygonal cross-sectional configuration may additionally include curved surfaces 222 (e.g., fillets, filleted surfaces, or interior curved surfaces) that extend (e.g., transition) between the interior surfaces 220 that are straight and form the polygonal shape (e.g., rectangle or square).
- curved surfaces 222 e.g., fillets, filleted surfaces, or interior curved surfaces
- stress may form in the polymeric material forming the shaft coupling portion 206 and may be concentrated near intersections between adjacent straight surfaces that form the polygonal cross-sectional shape of the bore 208 .
- the curved surfaces 222 extending between the interior surfaces 220 which are straight, may reduce such stress concentrations.
- the cross-sectional configuration of the bore 208 may be constant extending from the forward opening 212 to the rearward opening 214 .
- the bore 208 may also widen in regions adjacent the forward opening 212 and/or the rearward opening 214 of the bore 208 .
- the bore 208 may include a tapered surface 224 that extends axially and radially between the interior surfaces 220 , as well as the curved surfaces 222 , to the planar surface of the forward end 216 of the hub 202 .
- the tapered surface 224 may, as shown, be chamfered, or may alternatively be curved (e.g., filleted) or stepped.
- the bore 208 is adapted to receive the coupling member 230 .
- the coupling member 230 may also be referred to as a nut, a retaining nut, or an insert.
- the coupling member 230 is adapted to retain the compressor wheel 140 on the shaft 160 to form the compressor wheel assembly 200 .
- the coupling member 230 may, for example, be formed of a metal, plastic, or other suitable material. In some embodiments, the material forming the coupling member 230 may be relatively strong (e.g., stiffer) as compared to the polymeric material of the compressor wheel 140 .
- the coupling member 230 when transferring torque from the shaft 160 to the compressor wheel 140 , may withstand larger forces at radially inward locations where engaging the shaft 160 (as discussed in further detail below) than the polymeric material of the shaft coupling portion 206 of the compressor wheel 140 withstands at radially outward locations.
- the coupling member 230 generally includes a head portion 232 and an elongated body portion 234 that extends axially rearward from the head portion 232 (e.g., from a forward end 236 of the coupling member 230 to a rearward end 238 of coupling member 230 ).
- the head portion 232 may also be referred to as a head, while the elongated body portion 234 may also be referred to as a body, a hollow body, or a body portion.
- the elongated body portion 234 has a polygonal cross-sectional configuration that corresponds to the cross-sectional configuration of the bore 208 , which facilitates receipt of the coupling member 230 by the bore 208 and torque transfer therebetween. That is, the elongated body portion 234 has an outer periphery having exterior surfaces 240 (e.g., straight or planar exterior surfaces) that form the cross-sectional configuration.
- the elongated body portion 234 includes rectangular cross-sectional configuration (e.g., square), while the bore 208 includes a rectangular cross-sectional configuration.
- the body portion 234 may include other cross-sectional configurations, such as, a triangular cross-sectional configuration, a pentagonal cross-sectional configuration, a hexagonal cross-sectional configuration, an octagonal cross-sectional configuration, or other suitable cross-sectional configuration.
- the polygonal cross-sectional configuration of the body portion 234 may additionally include curved surfaces 242 (e.g., fillets, filleted surfaces, or exterior curved surfaces) that extend (e.g., transition) between the exterior surfaces 240 that are straight and form the polygonal shape (e.g., rectangle or square).
- curved surfaces 242 e.g., fillets, filleted surfaces, or exterior curved surfaces
- stress may form in the polymeric material forming the shaft coupling portion 206 and may be concentrated where edges of the straight exterior surfaces 240 of the body portion 234 engage the interior surface 220 .
- the curved surfaces 242 extending between the exterior surfaces 240 may reduce such stress concentrations by applying force to the interior surfaces 220 of the bore 208 over wider areas.
- the cross-sectional configuration of the body portion 234 may be constant extending from the head portion 232 to the rearward end 238 of the coupling member 230 .
- the body portion 234 may also widen adjacent the head portion 232 , for example, by forming a tapered surface 246 (e.g., chamfered, filleted, or stepped) that extends axially and radially between the exterior surfaces 240 , as well as the curved surfaces 242 , to a planar rear surface 244 of the head portion 232 .
- a tapered surface 246 e.g., chamfered, filleted, or stepped
- the coupling member 230 is adapted to be received by the bore 208 of the compressor wheel 140 . More particularly, the body portion 234 extends into and/or through the bore 208 of the compressor wheel 140 .
- the cross-sectional configuration of the body portion 234 is adapted to mate with the cross-sectional configuration of the bore 208 .
- the cross-sectional configuration of the body portion 234 has the same shape (e.g., rectangular, such as square) and is slightly smaller than the cross-sectional configuration of the bore 208 , such that the body portion 234 can be inserted into the bore 208 .
- the body portion 234 may have the same or slightly larger size, such that the body portion 234 is press fit into the bore 208 , such that the body portion 234 is radially compressed by the shaft coupling portion 206 of the compressor wheel 140 surrounding and engaging the body portion 234 .
- the exterior surfaces 240 and the curved surfaces 242 engage the interior surfaces 220 and/or the curved surfaces 222 of the bore 208 to apply force thereto and, thereby, transfer torque from the coupling member 230 to the compressor wheel 140 .
- the head portion 232 of the coupling member 230 is disposed at the forward end 236 of the coupling member 230 .
- the head portion 232 is received against the forward end 216 of the compressor wheel 140 .
- the head portion 232 is adapted to be engaged by an operator, a tool, or other suitable engaging mechanism in order to insert the coupling member 230 into the bore 208 of the compressor wheel 140 .
- the head portion 232 may further facilitate connecting the coupling member 230 to the shaft 160 .
- the head portion 232 may, for example, have an outer periphery 250 (e.g., hexagonal) configured to be engaged by the operator, tool, or other suitable engaging mechanism for applying torque thereto for threaded engagement of the coupling member 230 to the shaft 160 .
- the head portion 232 may further include an outer surface 252 that is tapered (e.g., rounded, such as hemispherical, as shown) to improve aerodynamic flow of air over the inducer end of the compressor wheel assembly 200 (e.g., as opposed to having a central planar surface).
- an outer surface 252 that is tapered (e.g., rounded, such as hemispherical, as shown) to improve aerodynamic flow of air over the inducer end of the compressor wheel assembly 200 (e.g., as opposed to having a central planar surface).
- the coupling member 230 is adapted to receive a portion of the shaft 160 to connect thereto.
- the coupling member 230 may be internally threaded, while the shaft 160 is externally threaded, such that the shaft 160 is threadably received by the coupling member 230 . This threaded engagement allows torque to be transferred form the shaft 160 to the coupling member 230 and, thereby, to the compressor wheel 140 .
- the coupling member 230 may include a hollow interior having a first portion 254 and a second portion 256 .
- the first portion 254 extends axially forward from the rearward end 238 of the coupling member 230 to the second portion 256 .
- the second portion 256 extends axially forward from the first portion 254 into the head portion 232 of the coupling member 230 .
- the first portion 254 includes an interior profile (e.g., cross-sectional shape, such as a diameter) that is larger than an interior profile associated of the second portion 256 .
- the second portion 256 may be internally threaded with the threads protruding radially inward relative to an interior surface (e.g., cylindrical or unthreaded surface) of the first portion 254 .
- a shoulder surface 258 may also extend radially outward from the interior surface of the first portion 254 to the second portion 256 of the hollow interior of the coupling member 230 .
- the hollow interior of the coupling member 230 may also be referred to as a bore.
- the shaft 160 is adapted to be inserted into the hollow interior of the coupling member 230 .
- the shaft 160 includes a rearward portion 260 and a forward portion 262 .
- the rearward portion 260 may, for example, extend into the bearing housing 170 .
- the forward portion 262 (e.g., forward portion) extends axially from the rearward portion 260 to a forward end 264 of the shaft 160 .
- the forward portion 262 has a smaller diameter than the rearward portion 260 with a shoulder 266 extending radially therebetween.
- the forward portion 262 is adapted to be inserted into and/or mated with the hollow interior of the coupling member 230 .
- the forward portion 262 of the shaft 160 includes a first subportion 262 a that corresponds to the first portion 254 of the hollow interior of the coupling member 230 and a second subportion 262 b that extends axially away (i.e., in a forward direction) from the first subportion 262 a and corresponds to the second portion 256 .
- the first subportion 262 a includes an outer profile corresponding to the interior profile of the first portion 254 of the coupling member 230 .
- the outer profile of the first subportion 262 a may be cylindrical with a diameter that is slightly smaller than a diameter corresponding to the interior profile of the first portion 254 of the coupling member 230 .
- the slightly smaller diameter of the first subportion 262 a of the forward portion 262 of the shaft 160 allows receipt of the forward portion 262 in the coupling member 230 and may also prevent relative radial movement (e.g., wobbling) therebetween.
- the second subportion 262 b of the forward portion 262 of the shaft 160 corresponds to the second portion 256 of the hollow interior of the coupling member 230 .
- the second subportion 262 b may be substantially cylindrical with exterior threads that correspond to and are received by interior threads of the second portion 256 of the coupling member 230 .
- the threads are represented schematically by the second subportion 262 b being shown with a larger outer diameter than an inner diameter of the second portion 256 of the coupling member.
- the coupling member 230 seats against the shaft 160 .
- a rearward end 245 of the coupling member 230 may seat against the shoulder 266 that extends radially between the rearward portion 260 and the forward portion 262 of the shaft 160 .
- the body portion 234 of the coupling member 230 includes an axial length that, relative to an axial length of the bore 208 , allows the rearward end 245 of the body portion 234 to engage the shoulder 266 .
- the axial length of the body portion 234 is measured between the planar rear surface 244 of the head portion 232 and the rearward end 245 , while the axial length of the bore 208 is measured between the forward end 216 and the rearward end 218 thereof.
- the axial length of the body portion 234 may, as shown, be equal to the axial length of the bore 208 .
- the axial length of the body portion 234 may be slightly greater than the axial length of the bore 208 in which case the compressor wheel 140 is slightly axially compressed between the head portion 232 of the coupling member 230 and the shoulder 266 of the shaft 160 , while still allowing the rearward end 245 of the coupling member 230 to engage the shoulder 266 of the shaft 160 from the threaded engagement therebetween.
- the rearward end 245 of the coupling member 230 is axially spaced apart from the shoulder 266 of the shaft 160 in which case the axial length of the bore 208 is greater than the axial length of the body portion 234 of the coupling member 230 .
- the compressor wheel 140 may be compressed axially between the head portion 232 of the coupling member 230 and the shoulder 266 of the shaft 160 from the threaded engagement between the coupling member 230 and the shaft 160 .
- an axial length of the forward portion 262 of the shaft 160 and an axial length of the hollow interior of the coupling member 230 are cooperatively configured for the coupling member 230 and/or the compressor wheel 140 to seat against the shaft 160 .
- the axial length of the hollow interior of the coupling member 230 is greater than the axial length of the distal end 26 t 2 of the shaft 160 .
- the forward portion 262 of the shaft 160 does not bottom out in the hollow interior of the coupling member 230 .
- the coupling member 230 and the shaft 160 may also be configured, such that an axial gap 270 (e.g., void) is formed between the forward end 264 of the shaft 160 and an end surface 272 (e.g., interior end surface) of the hollow interior of the coupling member 230 .
- an axial gap 270 e.g., void
- the hollow interior of the body portion 234 may extend axially forward of the forward end 216 of the compressor wheel 140 , while the forward end 264 of the shaft 160 terminates rearward of the forward end 216 of the compressor wheel 140 .
- the shaft 160 may have less mass (e.g., provide weight relief) than a shaft extending entirely therethrough.
- the compressor wheel assembly 200 may additionally include a collar 280 .
- the collar 280 is configured to prevent deformation of the shaft coupling portion 206 of the compressor wheel 140 , for example, as torque is transferred thereto from the coupling member 230 and/or centrifugal force acts on thereon.
- the collar 280 is made from a stronger (e.g., stiffer) material than the polymeric material forming the compressor wheel 140 .
- the collar 280 may be formed of a metal, plastic, or other suitable material.
- the collar 280 includes a generally cylindrical profile and includes a bore 282 extending from a first end 284 of the collar 280 to a second end 286 of the collar 280 .
- the bore 282 is adapted to receive a portion of the compressor wheel 140 and, in particular, the shaft coupling portion 206 thereof.
- the bore 282 of the collar 280 includes an interior diameter adapted to receive and tightly engage the shaft coupling portion 206 of the compressor wheel 140 .
- the collar 280 is disposed around and engages the shaft coupling portion 206 , and further surrounds the coupling member 230 and/or the shaft 160 .
- the compressor wheel 140 may be susceptible to deformation (e.g., distortion) as the coupling member 230 applies force against polymeric material forming the shaft coupling portion 206 to accelerate the compressor wheel 140 . Deformation may also occur from centrifugal force acting on the shaft coupling portion 206 as the compressor wheel 140 is rotated at high rotational speeds.
- the collar 280 by tightly engaging the shaft coupling portion 206 and being radially outward (e.g., concentric with) the coupling member 230 , is adapted to limit and/or prevent such deformation.
- the collar 280 provides mechanical support to the shaft coupling portion 206 to limit radially outward movement of the polymeric material forming the shaft coupling portion 206 .
- the terminology “or” is intended to mean an inclusive “or” rather than an exclusive “or”. That is, unless specified otherwise, or clear from context, “X includes A or B” is intended to indicate any of the natural inclusive permutations. That is, if X includes A; X includes B; or X includes both A and B, then “X includes A or B” is satisfied under any of the foregoing instances.
- the articles “a” and “an” as used in this application and the appended claims should generally be construed to mean “one or more” unless specified otherwise or clear from context to be directed to a singular form.
Abstract
A compressor wheel assembly (200) includes a compressor wheel (140) and a coupling member (230). The compressor wheel (140) is formed of a polymeric material. The compressor wheel (140) includes a hub (202), blades (204) extending from a forward surface (210) of the hub (202), and a shaft coupling portion (206) extending axially rearward from a rearward surface of the hub (202). The shaft coupling portion (206) includes a bore (208) extending therethrough and having a polygonal cross-sectional configuration. The coupling member (230) includes a head (232) and a body (234) extending axially from the head (232). The head (232) is received against a forward end (216) of the compressor wheel (140) and the body (234) extends through the bore (208). The body (234) has another polygonal cross-sectional configuration for transferring torque from the coupling member (23) to the compressor wheel (140).
Description
- The present application claims the benefit of priority to U.S. Provisional Patent Application No. 62/579,421, filed on Oct. 31, 2017 and the contents of which are incorporated herein by reference in its entirety.
- This disclosure relates to compressor wheels, and more particularly, to a system and method for compressor wheel retention using a squared nut.
- Turbochargers are forced-induction devices that are utilized to increase the pressure of the intake air provided to an engine. A compressor wheel is attached to a shaft, which is rotated, for example, by an electric motor, exhaust gas from the engine, or both. The compressor wheel, thereby, pressurizes ambient intake air and supplies pressurized intake air to the engine. By pressurizing the intake air, the engine may have increased power output compared to an otherwise comparable a naturally-aspirated engine.
- Compressor wheels are typically made of metal materials, such as aluminum. Compressor wheels may, alternatively, be made of polymeric materials that made provide various advantages (e.g., lower moment of inertia, different manufacturing methods).
- Disclosed herein are aspects, features, elements, implementations, and embodiments of compressor wheels and, in particular, polymeric compressor wheels and compressor wheel assemblies comprising the same.
- A compressor wheel assembly includes a compressor wheel and a coupling member. The compressor wheel is formed of a polymeric material. The compressor wheel includes a hub, blades extending from a forward surface of the hub, and a shaft coupling portion extending axially rearward from a rearward surface of the hub. The shaft coupling portion includes a bore extending therethrough and having a polygonal cross-sectional configuration. The coupling member includes a head and a body extending axially from the head. The head is received against a forward end of the compressor wheel and the body extends through the bore. The body has another polygonal cross-sectional configuration for transferring torque from the coupling member to the compressor wheel.
- The compressor wheel assembly may further include a shaft. The body of the coupling member includes a hollow interior. The shaft includes a forward portion that is threadably received in the hollow interior to couple the shaft to the coupling member and transfer torque thereto as the shaft is rotated by a drive source.
- The compressor wheel assembly may further include a collar disposed around and engaging the shaft coupling portion. The collar is formed of a material that is stiffer than the polymeric material.
- The disclosure is best understood from the following detailed description when read in conjunction with the accompanying drawings. It is emphasized that, according to common practice, the various features of the drawings are not to-scale. On the contrary, the dimensions of the various features are arbitrarily expanded or reduced for clarity.
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FIG. 1 generally illustrates a perspective partial cross-section view of a turbocharger according to the principles of the present disclosure. -
FIG. 2 generally illustrates a perspective view of a compressor wheel assembly according to the principles of the present disclosure. -
FIG. 3 generally illustrates a perspective cross-section of an exploded view of a compressor wheel assembly according to the principles of the present disclosure. -
FIG. 4 generally illustrates a perspective cross-section of a compressor wheel assembly according to the principles of the present disclosure. -
FIG. 5 generally illustrates a perspective cross-section of a compressor wheel assembly including a collar according to the principles of the present disclosure. - Disclosed herein are embodiments of a compressor wheel and a compressor wheel assembly, which may be used in a turbocharger. The compressor wheel is formed of a polymeric material and is connected to a shaft with a coupling member to, thereby, form a compressor wheel assembly. More particularly, the compressor wheel includes a central bore in which is received the coupling member, which is in turn coupled to the shaft. The central bore and the coupling member have complementary polygonal cross-sectional shapes that allow torque transfer therebetween. The central bore and the coupling member may also have complementary axial lengths, and the coupling member and the shaft may include opposing surfaces, which cooperatively allow the compressor wheel to be held axially therebetween. These and further aspects of the compressor wheel and the compressor wheel assembly disclosed herein are discussed in further detail below.
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FIG. 1 generally illustrates a perspective partial cross-section view of aturbocharger 100 according to the principles of the present disclosure. Theturbocharger 100 is an exhaust-gas driven forced induction device that is utilized in conjunction with an internal combustion engine (not shown). Theturbocharger 100 includes aturbine wheel 110. Theturbine wheel 110 is located in aturbine housing 120. Theturbine housing 120 includes anexhaust gas inlet 122 for receiving exhaust gas from the internal combustion engine. Exhaust gases are routed from theexhaust gas inlet 122 to theturbine wheel 110 before exiting theturbine housing 120 at anexhaust gas outlet 123. Awastegate 124 may be mounted in theturbine housing 120 to allow some or all of the exhaust gas to bypass theturbine wheel 110. Thewastegate 124 is movable between an open position and a closed position by an electriclinear actuator 130. - The turbocharger includes a compressor wheel assembly including a
compressor wheel 140. Thecompressor wheel 140 is located in acompressor housing 150. Thecompressor housing 150 includes anair inlet 152 and a volute in communication with an air outlet (not shown). Intake air is routed from theair inlet 152 to thecompressor wheel 140, where the intake air is pressurized by rotation of thecompressor wheel 140. The compressed air enters the volute and then exits thecompressor housing 150 via the air outlet to be supplied to the internal combustion engine. - Rotation of the
compressor wheel 140 is driven by rotation of theturbine wheel 110. In particular, theturbine wheel 110 and thecompressor wheel 140 are each connected to ashaft 160. Theshaft 160 can be a substantially rigid member, and each of theturbine wheel 110 and thecompressor wheel 140 can be connected to theshaft 160 in a manner that prevents rotation of theturbine wheel 110 and thecompressor wheel 140 with respect to theshaft 160. As a result, thecompressor wheel 140 can rotate in unison with theturbine wheel 110 in response to rotation of theturbine wheel 110. - The
shaft 160 is supported within a bearinghousing 170 such that it is able to rotate freely with respect to the bearinghousing 170 at a high rotational speed. Thebearing housing 170, the turbine housing 120, and thecompressor housing 150 are all arranged along an axis of rotation of theshaft 160. In particular, thebearing housing 170 is positioned between theturbine housing 120 and thecompressor housing 150, with a first end of the bearinghousing 170 being connected to theturbine housing 120 and a second end of the bearinghousing 170 being connected to thecompressor housing 150. The bearinghousing 170 can incorporate lubrication and/or cooling features. -
FIGS. 2-5 generally illustrate acompressor wheel assembly 200 according to the principles of the present disclosure. Thecompressor wheel assembly 200 may be associated with a turbocharger, such as theturbocharger 100 ofFIG. 1 , or another forced induction device (e.g., driven by the exhaust, an electric motor, and/or another suitable drive source). - The
compressor wheel assembly 200 generally includes a compressor wheel 140 (e.g., that shown inFIG. 1 ), theshaft 160, and acoupling member 230 that is adapted to secure thecompressor wheel 140 to theshaft 160. - The
compressor wheel 140 is formed a polymeric material, such as glass-filled nylon, plastic, or may comprise other suitable materials. Thecompressor wheel 140 may, for example, be injection molded. Thecompressor wheel 140 may also be referred to as a polymeric compressor wheel. - The
compressor wheel 140 generally includes ahub 202,blades 204, and ashaft coupling portion 206 having abore 208 extending axially therethrough. Moving from an inducer end of the compressor wheel 140 (e.g., near the air inlet 152) to an exducer end (e.g., near the volute), thehub 202 widens with an outer surface 210 (e.g., forward surface) that is convex in cross-section (e.g., moving from a near vertical surface to a near horizontal surface). Thehub 202 may, for example, have generally constant wall thickness, which may be advantageous for manufacturing (e.g., injection molding). - The
blades 204 are generally configured to draw ambient air into thecompressor housing 150, compress the air, and expel compressed air to the volute for supply to the engine. Theblades 204 disposed on theouter surface 210 of thehub 202 and extend away (e.g., radially and/or axially) therefrom. Theblades 204 may be identical or substantially identical to one another. For example, each of theblades 204 may comprise identical or substantially identical shapes and dimensions. Alternatively, theblades 204 may have different shape and/or sizes (e.g., larger and smaller blades). Theblades 204 are formed integrally with thehub 202, for example, during the injection molding process. - The
shaft coupling portion 206 extends axially rearward from an inner surface (not labeled; e.g., rearward surface) of thehub 202. Theshaft coupling portion 206 is, for example, formed as a protrusion that extends axially rearward (i.e., away from an inducer end of the compressor wheel 140). Moving rearward, theshaft coupling portion 206 is spaced apart radially from the inner surface of thehub 202 at increasing distances. Theshaft coupling portion 206 includes thebore 208 extending axially therethrough, which, as discussed in further detail below, allows receipt of thecoupling member 230 for coupling thecompressor wheel 140 to theshaft 160. Theshaft coupling portion 206 is parallel (e.g., concentric) with theshaft 160 when coupled thereto. While shown as being generally cylindrical, theshaft coupling portion 206 may have different configurations (e.g., having a non-circular cross-sectional shape and/or having different cross-sectional shapes and/or sizes moving axially therealong). Theshaft coupling portion 206 is formed integrally with thehub 202, for example, during the injection molding process. - The
bore 208 and thecoupling member 230 are cooperatively configured to couple thecompressor wheel 140 to theshaft 160 and to transfer torque therebetween. More particularly, thebore 208 and thecoupling member 230 have complementary cross-sectional shapes, which allow receipt of thecoupling member 230 axially into thebore 208 and which transfer force between engaging surfaces thereof. - The
bore 208 extends axially entirely through thecompressor wheel 140, so as to have aforward opening 212 and arearward opening 214. Theforward opening 212 of thebore 208 is positioned at a forward end 216 (e.g., first or inducer end) of the compressor wheel 140), which may form a planar surface extending radially inward from theouter surface 210 of thehub 202. Therearward opening 214 of thebore 208 is positioned at arearward end 218 of theshaft coupling portion 206. Therearward end 218 of theshaft coupling portion 206 may also form a planar surface. Thebore 208 includes a polygonal cross-sectional configuration (e.g., shape), such as a rectangular cross-sectional configuration (e.g., square, as shown). That is, thebore 208 has an inner periphery having interior surfaces 220 (e.g., straight or planar interior surfaces) that form the cross-sectional configuration. In some embodiments, thebore 208 may include other cross-sectional configurations, such as, a triangular cross-sectional configuration, a pentagonal cross-sectional configuration, a hexagonal cross-sectional configuration, an octagonal cross-sectional configuration, or other suitable cross-sectional configuration. - The polygonal cross-sectional configuration may additionally include curved surfaces 222 (e.g., fillets, filleted surfaces, or interior curved surfaces) that extend (e.g., transition) between the
interior surfaces 220 that are straight and form the polygonal shape (e.g., rectangle or square). As exterior surfaces ofcoupling member 230 engage the interior surfaces defining thebore 208, stress may form in the polymeric material forming theshaft coupling portion 206 and may be concentrated near intersections between adjacent straight surfaces that form the polygonal cross-sectional shape of thebore 208. Thecurved surfaces 222 extending between theinterior surfaces 220, which are straight, may reduce such stress concentrations. - The cross-sectional configuration of the
bore 208 may be constant extending from theforward opening 212 to therearward opening 214. Thebore 208 may also widen in regions adjacent theforward opening 212 and/or therearward opening 214 of thebore 208. For example, thebore 208 may include atapered surface 224 that extends axially and radially between theinterior surfaces 220, as well as thecurved surfaces 222, to the planar surface of theforward end 216 of thehub 202. Thetapered surface 224 may, as shown, be chamfered, or may alternatively be curved (e.g., filleted) or stepped. - The
bore 208 is adapted to receive thecoupling member 230. Thecoupling member 230 may also be referred to as a nut, a retaining nut, or an insert. Thecoupling member 230 is adapted to retain thecompressor wheel 140 on theshaft 160 to form thecompressor wheel assembly 200. Thecoupling member 230 may, for example, be formed of a metal, plastic, or other suitable material. In some embodiments, the material forming thecoupling member 230 may be relatively strong (e.g., stiffer) as compared to the polymeric material of thecompressor wheel 140. In this manner, thecoupling member 230, when transferring torque from theshaft 160 to thecompressor wheel 140, may withstand larger forces at radially inward locations where engaging the shaft 160 (as discussed in further detail below) than the polymeric material of theshaft coupling portion 206 of thecompressor wheel 140 withstands at radially outward locations. - The
coupling member 230 generally includes ahead portion 232 and anelongated body portion 234 that extends axially rearward from the head portion 232 (e.g., from aforward end 236 of thecoupling member 230 to arearward end 238 of coupling member 230). Thehead portion 232 may also be referred to as a head, while theelongated body portion 234 may also be referred to as a body, a hollow body, or a body portion. - The
elongated body portion 234 has a polygonal cross-sectional configuration that corresponds to the cross-sectional configuration of thebore 208, which facilitates receipt of thecoupling member 230 by thebore 208 and torque transfer therebetween. That is, theelongated body portion 234 has an outer periphery having exterior surfaces 240 (e.g., straight or planar exterior surfaces) that form the cross-sectional configuration. For example, theelongated body portion 234 includes rectangular cross-sectional configuration (e.g., square), while thebore 208 includes a rectangular cross-sectional configuration. Thebody portion 234 may include other cross-sectional configurations, such as, a triangular cross-sectional configuration, a pentagonal cross-sectional configuration, a hexagonal cross-sectional configuration, an octagonal cross-sectional configuration, or other suitable cross-sectional configuration. - The polygonal cross-sectional configuration of the
body portion 234 may additionally include curved surfaces 242 (e.g., fillets, filleted surfaces, or exterior curved surfaces) that extend (e.g., transition) between theexterior surfaces 240 that are straight and form the polygonal shape (e.g., rectangle or square). As theinterior surfaces 220 of thebore 208 are engaged by theexterior surfaces 240, stress may form in the polymeric material forming theshaft coupling portion 206 and may be concentrated where edges of the straightexterior surfaces 240 of thebody portion 234 engage theinterior surface 220. Thecurved surfaces 242 extending between theexterior surfaces 240 may reduce such stress concentrations by applying force to theinterior surfaces 220 of thebore 208 over wider areas. - The cross-sectional configuration of the
body portion 234 may be constant extending from thehead portion 232 to therearward end 238 of thecoupling member 230. Thebody portion 234 may also widen adjacent thehead portion 232, for example, by forming a tapered surface 246 (e.g., chamfered, filleted, or stepped) that extends axially and radially between theexterior surfaces 240, as well as thecurved surfaces 242, to a planarrear surface 244 of thehead portion 232. - The
coupling member 230 is adapted to be received by thebore 208 of thecompressor wheel 140. More particularly, thebody portion 234 extends into and/or through thebore 208 of thecompressor wheel 140. The cross-sectional configuration of thebody portion 234 is adapted to mate with the cross-sectional configuration of thebore 208. For example, the cross-sectional configuration of thebody portion 234 has the same shape (e.g., rectangular, such as square) and is slightly smaller than the cross-sectional configuration of thebore 208, such that thebody portion 234 can be inserted into thebore 208. Alternatively, thebody portion 234 may have the same or slightly larger size, such that thebody portion 234 is press fit into thebore 208, such that thebody portion 234 is radially compressed by theshaft coupling portion 206 of thecompressor wheel 140 surrounding and engaging thebody portion 234. When theelongated body portion 234 is received by thebore 208, theexterior surfaces 240 and thecurved surfaces 242 engage theinterior surfaces 220 and/or thecurved surfaces 222 of thebore 208 to apply force thereto and, thereby, transfer torque from thecoupling member 230 to thecompressor wheel 140. - The
head portion 232 of thecoupling member 230 is disposed at theforward end 236 of thecoupling member 230. Thehead portion 232 is received against theforward end 216 of thecompressor wheel 140. - The
head portion 232 is adapted to be engaged by an operator, a tool, or other suitable engaging mechanism in order to insert thecoupling member 230 into thebore 208 of thecompressor wheel 140. Thehead portion 232 may further facilitate connecting thecoupling member 230 to theshaft 160. For example, thehead portion 232 may, for example, have an outer periphery 250 (e.g., hexagonal) configured to be engaged by the operator, tool, or other suitable engaging mechanism for applying torque thereto for threaded engagement of thecoupling member 230 to theshaft 160. - The
head portion 232 may further include anouter surface 252 that is tapered (e.g., rounded, such as hemispherical, as shown) to improve aerodynamic flow of air over the inducer end of the compressor wheel assembly 200 (e.g., as opposed to having a central planar surface). - The
coupling member 230 is adapted to receive a portion of theshaft 160 to connect thereto. For example, thecoupling member 230 may be internally threaded, while theshaft 160 is externally threaded, such that theshaft 160 is threadably received by thecoupling member 230. This threaded engagement allows torque to be transferred form theshaft 160 to thecoupling member 230 and, thereby, to thecompressor wheel 140. - The
coupling member 230 may include a hollow interior having afirst portion 254 and asecond portion 256. Thefirst portion 254 extends axially forward from therearward end 238 of thecoupling member 230 to thesecond portion 256. Thesecond portion 256 extends axially forward from thefirst portion 254 into thehead portion 232 of thecoupling member 230. In some embodiments, thefirst portion 254 includes an interior profile (e.g., cross-sectional shape, such as a diameter) that is larger than an interior profile associated of thesecond portion 256. For example, thesecond portion 256 may be internally threaded with the threads protruding radially inward relative to an interior surface (e.g., cylindrical or unthreaded surface) of thefirst portion 254. Ashoulder surface 258 may also extend radially outward from the interior surface of thefirst portion 254 to thesecond portion 256 of the hollow interior of thecoupling member 230. The hollow interior of thecoupling member 230 may also be referred to as a bore. - The
shaft 160 is adapted to be inserted into the hollow interior of thecoupling member 230. Theshaft 160 includes arearward portion 260 and aforward portion 262. Therearward portion 260 may, for example, extend into the bearinghousing 170. The forward portion 262 (e.g., forward portion) extends axially from therearward portion 260 to aforward end 264 of theshaft 160. Theforward portion 262 has a smaller diameter than therearward portion 260 with ashoulder 266 extending radially therebetween. - The
forward portion 262 is adapted to be inserted into and/or mated with the hollow interior of thecoupling member 230. For example, theforward portion 262 of theshaft 160 includes afirst subportion 262 a that corresponds to thefirst portion 254 of the hollow interior of thecoupling member 230 and a second subportion 262 b that extends axially away (i.e., in a forward direction) from thefirst subportion 262 a and corresponds to thesecond portion 256. - The
first subportion 262 a includes an outer profile corresponding to the interior profile of thefirst portion 254 of thecoupling member 230. For example, the outer profile of thefirst subportion 262 a may be cylindrical with a diameter that is slightly smaller than a diameter corresponding to the interior profile of thefirst portion 254 of thecoupling member 230. The slightly smaller diameter of thefirst subportion 262 a of theforward portion 262 of theshaft 160 allows receipt of theforward portion 262 in thecoupling member 230 and may also prevent relative radial movement (e.g., wobbling) therebetween. - The second subportion 262 b of the
forward portion 262 of theshaft 160 corresponds to thesecond portion 256 of the hollow interior of thecoupling member 230. The second subportion 262 b may be substantially cylindrical with exterior threads that correspond to and are received by interior threads of thesecond portion 256 of thecoupling member 230. The threads are represented schematically by the second subportion 262 b being shown with a larger outer diameter than an inner diameter of thesecond portion 256 of the coupling member. - Referring to
FIGS. 4-5 , thecoupling member 230 seats against theshaft 160. For example, arearward end 245 of thecoupling member 230 may seat against theshoulder 266 that extends radially between therearward portion 260 and theforward portion 262 of theshaft 160. More particularly, thebody portion 234 of thecoupling member 230 includes an axial length that, relative to an axial length of thebore 208, allows therearward end 245 of thebody portion 234 to engage theshoulder 266. The axial length of thebody portion 234 is measured between the planarrear surface 244 of thehead portion 232 and therearward end 245, while the axial length of thebore 208 is measured between theforward end 216 and therearward end 218 thereof. The axial length of thebody portion 234 may, as shown, be equal to the axial length of thebore 208. Thus, as theforward portion 262 of theshaft 160 is threaded to thesecond portion 256 in the hollow interior of thecoupling member 230, therearward end 245 is drawn toward and mates against theshoulder 266 of theshaft 160. Alternatively, the axial length of thebody portion 234 may be slightly greater than the axial length of thebore 208 in which case thecompressor wheel 140 is slightly axially compressed between thehead portion 232 of thecoupling member 230 and theshoulder 266 of theshaft 160, while still allowing therearward end 245 of thecoupling member 230 to engage theshoulder 266 of theshaft 160 from the threaded engagement therebetween. - In a still further alternative, the
rearward end 245 of thecoupling member 230 is axially spaced apart from theshoulder 266 of theshaft 160 in which case the axial length of thebore 208 is greater than the axial length of thebody portion 234 of thecoupling member 230. As a result, thecompressor wheel 140 may be compressed axially between thehead portion 232 of thecoupling member 230 and theshoulder 266 of theshaft 160 from the threaded engagement between thecoupling member 230 and theshaft 160. - Furthermore, an axial length of the
forward portion 262 of theshaft 160 and an axial length of the hollow interior of thecoupling member 230 are cooperatively configured for thecoupling member 230 and/or thecompressor wheel 140 to seat against theshaft 160. For example, in embodiments in which thecoupling member 230 seats against theshaft 160, the axial length of the hollow interior of thecoupling member 230 is greater than the axial length of the distal end 26 t 2 of theshaft 160. As a result, theforward portion 262 of theshaft 160 does not bottom out in the hollow interior of thecoupling member 230. - The
coupling member 230 and theshaft 160 may also be configured, such that an axial gap 270 (e.g., void) is formed between theforward end 264 of theshaft 160 and an end surface 272 (e.g., interior end surface) of the hollow interior of thecoupling member 230. For example, the hollow interior of thebody portion 234 may extend axially forward of theforward end 216 of thecompressor wheel 140, while theforward end 264 of theshaft 160 terminates rearward of theforward end 216 of thecompressor wheel 140. By not extending to theend surface 272, theshaft 160 may have less mass (e.g., provide weight relief) than a shaft extending entirely therethrough. - Referring to
FIG. 5 , thecompressor wheel assembly 200 may additionally include acollar 280. Thecollar 280 is configured to prevent deformation of theshaft coupling portion 206 of thecompressor wheel 140, for example, as torque is transferred thereto from thecoupling member 230 and/or centrifugal force acts on thereon. Thecollar 280 is made from a stronger (e.g., stiffer) material than the polymeric material forming thecompressor wheel 140. For example, thecollar 280 may be formed of a metal, plastic, or other suitable material. Thecollar 280 includes a generally cylindrical profile and includes abore 282 extending from afirst end 284 of thecollar 280 to asecond end 286 of thecollar 280. Thebore 282 is adapted to receive a portion of thecompressor wheel 140 and, in particular, theshaft coupling portion 206 thereof. Thebore 282 of thecollar 280 includes an interior diameter adapted to receive and tightly engage theshaft coupling portion 206 of thecompressor wheel 140. As such, thecollar 280 is disposed around and engages theshaft coupling portion 206, and further surrounds thecoupling member 230 and/or theshaft 160. - During operation of the
turbocharger 100, as theshaft 160 is rotated and torque is transferred to thecoupling member 230 and, thereby, to theshaft coupling portion 206, thecompressor wheel 140 may be susceptible to deformation (e.g., distortion) as thecoupling member 230 applies force against polymeric material forming theshaft coupling portion 206 to accelerate thecompressor wheel 140. Deformation may also occur from centrifugal force acting on theshaft coupling portion 206 as thecompressor wheel 140 is rotated at high rotational speeds. Thecollar 280, by tightly engaging theshaft coupling portion 206 and being radially outward (e.g., concentric with) thecoupling member 230, is adapted to limit and/or prevent such deformation. For example, thecollar 280 provides mechanical support to theshaft coupling portion 206 to limit radially outward movement of the polymeric material forming theshaft coupling portion 206. - As used herein, the terminology “or” is intended to mean an inclusive “or” rather than an exclusive “or”. That is, unless specified otherwise, or clear from context, “X includes A or B” is intended to indicate any of the natural inclusive permutations. That is, if X includes A; X includes B; or X includes both A and B, then “X includes A or B” is satisfied under any of the foregoing instances. In addition, the articles “a” and “an” as used in this application and the appended claims should generally be construed to mean “one or more” unless specified otherwise or clear from context to be directed to a singular form.
- Further, for simplicity of explanation, although the figures and descriptions herein may include sequences or series of steps or stages, elements of the methods disclosed herein may occur in various orders or concurrently. Additionally, elements of the methods disclosed herein may occur with other elements not explicitly presented and described herein. Furthermore, not all elements of the methods described herein may be required to implement a method in accordance with this disclosure. Although aspects, features, and elements are described herein in particular combinations, each aspect, feature, or element may be used independently or in various combinations with or without other aspects, features, and elements.
- While the disclosure has been described in connection with certain embodiments, it is to be understood that the disclosure is not to be limited to the disclosed embodiments but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the scope of the appended claims, which scope is to be accorded the broadest interpretation so as to encompass all such modifications and equivalent structures as is permitted under the law.
Claims (15)
1. A compressor wheel assembly (200), comprising:
a compressor wheel (140) formed of a polymeric material, the compressor wheel (140) comprising a hub (202), blades (204) extending from a forward surface (210) of the hub (202), and a shaft coupling portion (206) extending axially rearward from a rearward surface of the hub (202), wherein the shaft coupling portion (206) includes a bore (208) extending therethrough and having a polygonal cross-sectional configuration; and
a coupling member (230) having a head (232) and a body (234) extending axially from the head (232), wherein the head (232) is received against a forward end (216) of the compressor wheel (140) and the body (234) extends through the bore (208), and the body (234) has another polygonal cross-sectional configuration for transferring torque from the coupling member (230) to the compressor wheel (140).
2. The compressor wheel assembly (200) according to claim 1 , wherein the polygonal cross-sectional configuration of the bore (208) and the other polygonal cross-sectional configuration of the body (234) are square.
3. The compressor wheel assembly (200) according to claim 1 , wherein the bore (208) includes interior surfaces (220) that are straight and interior curved surfaces extending therebetween to form the polygonal cross-sectional configuration, and the body (234) includes exterior surfaces (240) that are straight and exterior curved surfaces extending therebetween to form the other polygonal cross-sectional configuration.
4. The compressor wheel assembly (200) according to claim 1 , wherein the polygonal cross-sectional configuration extends an axial length of the bore (208), and the other polygonal cross-sectional configuration extends another axial length of the body (234), wherein the other axial length of the bore (208) is greater than or equal to the axial length of the body (234).
5. The compressor wheel assembly (200) according to claim 1 , wherein the coupling member (230) is formed of a material that is stiffer than the polymeric material.
6. The compressor wheel assembly (200) according to claim 1 , further comprising,
a shaft (160);
wherein the body (234) of the coupling member (230) includes a hollow interior; and
wherein the shaft (160) includes a forward portion (262) that is threadably received in the hollow interior to couple the shaft (160) to the coupling member (230) and transfer torque thereto as the shaft (160) is rotated by a drive source.
7. The compressor wheel assembly (200) according to claim 6 , wherein the shaft (160) includes a rearward portion (260) having a diameter that is larger than a diameter of the forward portion (262) and from which the forward portion (262) extends forward axially, and a rearward end (238) of the coupling member (230) seats against a shoulder (266) extending radially between the rearward portion (260) and the forward portion (262).
8. The compressor wheel assembly (200) according to claim 6 , wherein the forward portion (262) is received by the hollow interior to couple the shaft (160) to the coupling member (230), and a void (270) is formed axially between an interior end surface (272) of the body (234) and a forward end (264) of the shaft (160).
9. The compressor wheel assembly (200) according to claim 8 , wherein the hollow interior of the body (234) extends axially forward of the forward end (216) of the compressor wheel (140), and the forward end (264) of the shaft (160) terminates rearward of the forward end (216) of the compressor wheel (140).
10. The compressor wheel assembly (200) according to claim 6 , further comprises a collar (280) disposed around and engages the shaft coupling portion (206), and the collar (280) is formed of a material that is stiffer than the polymeric material.
11. The compressor wheel assembly according to claim 10 , wherein the collar (280) surrounds the coupling member (230).
12. A compressor wheel assembly (200) comprising:
a compressor wheel (140) formed of a polymeric material, the compressor wheel (140) comprising a hub (202), blades (204) extending from a forward surface (210) of the hub (202), and a shaft coupling portion (206) extending axially rearward from a rearward surface of the hub (202); wherein the shaft coupling portion (206) includes a bore (208) extending therethrough and having a polygonal cross-sectional configuration:
a coupling member (230) formed of a material stiffer than the polymeric material and having a head (232) and a body (234) extending axially from the head (232) and having a hollow interior, wherein the head (232) is received against a forward end (216) of the compressor wheel (140) and the body (234) extends through the bore (208), and the body (234) has another polygonal cross-sectional configuration for transferring torque from the coupling member (230) to the compressor wheel (140); and
a shaft (160) having a forward portion (262) that is threadably received in the hollow interior to couple the shaft (160) to the coupling member (230) and transfer torque thereto as the shaft is (160) rotatably driven.
13. The compressor wheel assembly (200) according to claim 12 , wherein the polygonal cross-sectional configuration of the bore (208) and the body (234) are square or comprise straight and curved surfaces.
14. The compressor wheel assembly (200) according to claim 12 , further comprising a collar (280) disposed around and engaging the shaft coupling portion (206) wherein the collar (280) is formed of a material that is stiffer than the polymeric material.
15. The compressor wheel assembly (200) according to claim 12 , wherein the polygonal cross-sectional configuration extends an axial length of the bore (208), and the other polygonal cross-sectional configuration extends another axial length of the body (234), wherein the other axial length of the bore (208) is greater than or equal to the axial length of the body (234).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US16/172,931 US20190128127A1 (en) | 2017-10-31 | 2018-10-29 | Polymeric compressor wheel assembly |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US201762579421P | 2017-10-31 | 2017-10-31 | |
US16/172,931 US20190128127A1 (en) | 2017-10-31 | 2018-10-29 | Polymeric compressor wheel assembly |
Publications (1)
Publication Number | Publication Date |
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US20190128127A1 true US20190128127A1 (en) | 2019-05-02 |
Family
ID=64048691
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US16/172,931 Abandoned US20190128127A1 (en) | 2017-10-31 | 2018-10-29 | Polymeric compressor wheel assembly |
Country Status (5)
Country | Link |
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US (1) | US20190128127A1 (en) |
EP (1) | EP3477118A1 (en) |
JP (1) | JP2019082170A (en) |
KR (1) | KR20190049553A (en) |
CN (2) | CN109723670A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
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CN110388326A (en) * | 2019-06-12 | 2019-10-29 | 索奥斯(广东)玻璃技术股份有限公司 | A kind of cooling centrifugal blower of glass production line glass |
CN113217431A (en) * | 2021-05-31 | 2021-08-06 | 南京国睿智能装备有限公司 | Self-adaptation inverter motor based on unstable amount of wind |
US20220145766A1 (en) * | 2020-11-12 | 2022-05-12 | Air-Tec Innovations, LLC | Turbo charger with compressor wheel |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
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CN110529324B (en) * | 2019-09-05 | 2020-10-02 | 江西理工大学 | Vertical oblique-impact double-nozzle integrated machine |
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- 2018-10-29 CN CN201811267656.4A patent/CN109723670A/en active Pending
- 2018-10-29 US US16/172,931 patent/US20190128127A1/en not_active Abandoned
- 2018-10-29 EP EP18203228.4A patent/EP3477118A1/en not_active Withdrawn
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Also Published As
Publication number | Publication date |
---|---|
EP3477118A1 (en) | 2019-05-01 |
CN109723670A (en) | 2019-05-07 |
KR20190049553A (en) | 2019-05-09 |
CN209309008U (en) | 2019-08-27 |
JP2019082170A (en) | 2019-05-30 |
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