초록 ▼

High efficiency and low noise is achieved in an automotive engine-cooling fan assembly by flaring the inlet to the shroud barrel, and shaping the tips of the fan blades to conform to the shape of the inlet. Separation of the flow entering the fan is reduced by extending the flare over the axial exte

High efficiency and low noise is achieved in an automotive engine-cooling fan assembly by flaring the inlet to the shroud barrel, and shaping the tips of the fan blades to conform to the shape of the inlet. Separation of the flow entering the fan is reduced by extending the flare over the axial extent of the blade tip, and tip clearance losses are reduced by controlling recirculation along the entire blade tip. Blade rake is used to minimize fan deflection, thereby allowing the use of small tip clearances, which further enhance performance.

대표청구항 ▼

High efficiency and low noise is achieved in an automotive engine-cooling fan assembly by flaring the inlet to the shroud barrel, and shaping the tips of the fan blades to conform to the shape of the inlet. Separation of the flow entering the fan is reduced by extending the flare over the axial exte

High efficiency and low noise is achieved in an automotive engine-cooling fan assembly by flaring the inlet to the shroud barrel, and shaping the tips of the fan blades to conform to the shape of the inlet. Separation of the flow entering the fan is reduced by extending the flare over the axial extent of the blade tip, and tip clearance losses are reduced by controlling recirculation along the entire blade tip. Blade rake is used to minimize fan deflection, thereby allowing the use of small tip clearances, which further enhance performance. on-parallel to the axis, as seen in a cross section of each groove. 16. The tool according to claim 7 wherein the side surfaces are divergent from one another in a rearward direction away from the end surface. 17. The tool according to claim 7 wherein the side surfaces are parallel to the axis as seen in the cross section. 18. The tool according to claim 9 wherein at least a portion of each groove is left uncovered by the deflector to be forwardly open. 19. A tool for chip removing machining comprising a rotary head defining a longitudinal axis of rotation, the head including: an envelope surface arranged generally symmetrically relative to the axis; a front end surface extending transversely relative to the axis; a plurality of circumferentially spaced insert seats configured for receiving respective cutting inserts, each insert seat disposed in a transition region between the envelope surface and the end surface; a main duct extending longitudinally within the head for conducting fluid, the main duct intersecting the end surface; a plurality of branch ducts extending generally transversely outwardly from a fluid inlet end thereof communicating with the main duct, the branch ducts extending all the way to respective insert seats for conducting fluid from the main duct to the insert seats, each branch duct defined by a groove machined directly in the front end surface and configured to induce a flow of fluid from a fluid inlet end thereof to a fluid outlet end thereof in response to rotation of the head; and a deflector arranged at a front end of the main duct for deflecting the fluid flow from the main duct to the branch ducts, the deflector arranged on an element removably attached to the end surface. 20. The tool according to claim 19 wherein the element includes a plate and a hollow bushing extending from the plate, the bushing being coaxial with the axis of the head, and including a plurality of holes spaced apart circumferentially with reference to the axis, the holes being aligned with the inlet ends of respective ones of the branch ducts. 21. The tool according to claim 19 wherein the element comprises a plate wider than the main duct and attached by screws to the end surface. 22. The tool according to claim 20 further including a hollow screw attached to the end surface coaxially with the axis and defining a front portion of the main duct, the element being attached to the screw by a screw thread, and the screw attached to the head by a screw thread. 23. A tool for chip removing machining comprising a rotary head defining a longitudinal axis of rotation, the head including: an envelope surface arranged generally symmetrically relative to the axis; a front end surface extending transversely relative to the axis; a plurality of circumferentially spaced insert seats configured for receiving respective cutting inserts, each insert seat disposed in a transition region between the envelope surface and the end surface a main duct extending longitudinally within the head for conducting fluid, the main duct intersecting the end surface; and a plurality of branch ducts extending transversely from the main duct for conducting fluid from the main duct to the insert seats, each branch duct defined by a groove formed in an end surface and configured to induce a flow of fluid from a fluid inlet end thereof to a fluid outlet end thereof in response to rotation of the head; wherein the end face forms lands between successive ones of the grooves, a total area of the grooves being less than a total area of the lands, as the areas of the grooves and the lands are seen in a direction perpendicular to the end surface. 24. A tool for chip removing machining comprising a rotary head defining a longitudinal axis of rotation, the head including: an envelope surface arranged generally symmetrically relative to the axis; a front end surface extending transversely relative to the axis; a plurality of circumferentially spac