Abstract: A fan blade (134) includes a working region (148) having a leading edge (138) and a pressure side (136). A plurality of flow modification features (150-1 to 150-4) are positioned at the working region, including first and second flow modification features (150-1, 150-2, 150-3) each having a wedge shape with a pointed end (152) and a wider end (154), and located on the pressure side. A length of the first flow modification feature is less than a chord length of the fan blade, and the pointed end of the first flow modification feature is spaced from the leading edge. A length of the second flow modification feature is less than the chord length of the fan blade, and the pointed end of the second flow modification feature is spaced from the leading edge. The first and second flow modification features are spaced from each other to define a channel (156) therebetween.

Abstract: A viscous clutch (20; 120; 220) includes an input member (24; 126; 224), an output member (26; 124; 226), a working chamber (38; 138; 238), a reservoir (36; 136; 236; 504; 604; 704; 804; 904; 1004; 1104) to hold a supply of a shear fluid, an outlet (36-2; 182; 236-2; 512; 612; 712; 812; 912; 1012; 1112), a return bore (26-2; 124B; 226-2), an accumulator (72; 502; 602; 702; 802; 902; 1002; 1102), and a first wall (70-1; 170; 270; 506; 606; 706; 806; 906; 1006; 1106) having an arcuate segment (70-1A; 506B; 606B; 706B; 806B; 906B; 1006B; 1106B). The reservoir is connected to the working chamber by a fluid circuit, along which the outlet passes the shear fluid from the reservoir to the working chamber and the return bore returns the shear fluid pumped out of the working chamber to the accumulator. The accumulator is arranged in series with the reservoir in the fluid circuit. The first wall is positioned within the reservoir to separate a first portion from a second portion.

Abstract: A cleaning system for use with a heat exchanger and a fluid pressurizing assembly includes a wand assembly, a pivot assembly, and a movement mechanism having a body and a piston rod moveable relative the body in response to fluid pressurization. The wand assembly includes a wand in fluid communication with the fluid pressurizing assembly, and having a first orifice configured to eject fluid toward the heat exchanger. The wand is supported by the pivot assembly such that the wand is selectively pivotable about a first pivot axis. The movement mechanism connects to the pivot assembly at a second pivot axis offset from the first pivot axis such that selective movement of the piston rod produces pivotal movement of the wand about the first pivot axis.

Abstract: A fan blade (134) includes a working region (148) having a leading edge (138) and a pressure side (136). A plurality of flow modification features (150-1 to 150-4) are positioned at the working region, including first and second flow modification features (150-1, 150-2, 150-3) each having a wedge shape with a pointed end (152) and a wider end (154), and located on the pressure side. A length of the first flow modification feature is less than a chord length of the fan blade, and the pointed end of the first flow modification feature is spaced from the leading edge. A length of the second flow modification feature is less than the chord length of the fan blade, and the pointed end of the second flow modification feature is spaced from the leading edge. The first and second flow modification features are spaced from each other to define a channel (156) therebetween.

Abstract: A cleaning system for use with a heat exchanger and a fluid pressurizing assembly includes a wand assembly, a pivot assembly, and a movement mechanism having a body and a piston rod moveable relative the body in response to fluid pressurization. The wand assembly includes a wand in fluid communication with the fluid pressurizing assembly, and having a first orifice configured to eject fluid toward the heat exchanger. The wand is supported by the pivot assembly such that the wand is selectively pivotable about a first pivot axis. The movement mechanism connects to the pivot assembly at a second pivot axis offset from the first pivot axis such that selective movement of the piston rod produces pivotal movement of the wand about the first pivot axis.

Abstract: A cleaning system for use with a heat exchanger and a fluid pressurizing assembly includes a wand assembly, a pivot assembly, and a movement mechanism having a body and a piston rod moveable relative the body in response to fluid pressurization. The wand assembly includes a wand in fluid communication with the fluid pressurizing assembly, and having a first orifice configured to eject fluid toward the heat exchanger. The wand is supported by the pivot assembly such that the wand is selectively pivotable about a first pivot axis. The movement mechanism connects to the pivot assembly at a second pivot axis offset from the first pivot axis such that selective movement of the piston rod produces pivotal movement of the wand about the pivot axis.

Abstract: A cleaning system for use with a heat exchanger and a fluid pressurizing assembly includes a wand assembly, a pivot assembly, and a movement mechanism having a body and a piston rod moveable relative the body in response to fluid pressurization. The wand assembly includes a wand in fluid communication with the fluid pressurizing assembly, and having a first orifice configured to eject fluid toward the heat exchanger. The wand is supported by the pivot assembly such that the wand is selectively pivotable about a first pivot axis. The movement mechanism connects to the pivot assembly at a second pivot axis offset from the first pivot axis such that selective movement of the piston rod produces pivotal movement of the wand about the pivot axis.

Abstract: A viscous clutch (30; 30?) includes a stationary journal bracket (32; 32?) defining a mounting shaft (32-1; 32-1?), an output member (34; 34?) rotatably supported on the mounting shaft about an axis (A), an input member (34; 34?) rotatably supported on the mounting shaft about the axis, and a working chamber (50; 50?) defined between the input member and the output member to selectively transmit torque there between when a shear fluid is present. The mounting shaft extends axially through the viscous clutch from a front face (62; 62?) of the viscous clutch to a rear face (56; 56?) of the viscous clutch, with the rear face defining a mounting surface for mounting the viscous clutch at a mounting location. The front and rear faces are located at opposite sides of the viscous clutch and face in opposite directions.

Abstract: A viscous clutch (30; 30?) includes a stationary journal bracket (32; 32?) defining a mounting shaft (32-1; 32-1?), an output member (34; 34?) rotatably supported on the mounting shaft about an axis (A), an input member (34; 34?) rotatably supported on the mounting shaft about the axis, and a working chamber (50; 50?) defined between the input member and the output member to selectively transmit torque there between when a shear fluid is present. The mounting shaft extends axially through the viscous clutch from a front face (62; 62?) of the viscous clutch to a rear face (56; 56?) of the viscous clutch, with the rear face defining a mounting surface for mounting the viscous clutch at a mounting location. The front and rear faces are located at opposite sides of the viscous clutch and face in opposite directions.

Abstract: An electromagnetically actuated viscous clutch assembly includes a rotor arranged relative to an axis of rotation, an electromagnetic coil for generating magnetic flux, a housing positioned adjacent to the rotor to create a fluid working chamber therebetween with the housing and the rotor being selectively rotatable relative to one another, an insert extending through the housing and configured to conduct magnetic flux from the electromagnetic coil along a flux path, a valve assembly electromagnetically linked to the insert along the flux path for selectively controlling fluid flow into the working chamber to selectively engage the rotor and the housing, and a plurality of recesses defined in a portion of the housing located at an interior of the flux path to reduce eddy currents.

Abstract: An electromagnetically actuated viscous clutch assembly includes a rotor arranged relative to an axis of rotation, an electromagnetic coil for generating magnetic flux, a housing positioned adjacent to the rotor to create a fluid working chamber therebetween with the housing and the rotor being selectively rotatable relative to one another, an insert extending through the housing and configured to conduct magnetic flux from the electromagnetic coil along a flux path, a valve assembly electromagnetically linked to the insert along the flux path for selectively controlling fluid flow into the working chamber to selectively engage the rotor and the housing, and a plurality of recesses defined in a portion of the housing located at an interior of the flux path to reduce eddy currents.

Abstract: A viscous clutch assembly (100) includes a rotor (104), a selectively rotatable member (102) surrounding the rotor and defining a working chamber (114) therebetween, a first opening (126A) defined through the rotor (104) between front and rear sides of the rotor (104) and in fluid communication with the working chamber (114) at both the front and rear sides of the rotor (104), a reservoir (112) supported by the rotor (104) and having a second opening (138), a valve assembly (106) supported by the rotor (106) having a cover plate (140) for selectively covering the second opening (138), and a channel (128,130) defined in the rotor (104) between the first opening (126A) and an area adjacent to the second opening (138). The channel (128,130) is in fluid communication with the first opening (126A).

Abstract: A viscous clutch assembly (100) includes a rotational input structure (110), a rotor (104) attached to the rotational input structure (110), a selectively rotatable member (102) surrounding the rotor (104) and rotatably supported by the rotational input structure (110), an electromagnetic coil (108) positioned relative to a driven side of the rotor (104), a valve assembly (106) supported by the rotor (104), and a magnetic flux circuit for controlling the valve assembly (106) with magnetic flux generated by the electromagnetic coil (108). The valve assembly (106) includes a cover plate (140) for regulating flow of a shear fluid. The rotational input structure (110) comprises a material capable of conducting magnetic flux. The magnetic flux circuit is configured to include no more than four air gaps (G1-G4).

Abstract: A valve assembly (106) for an electromagnetically actuated viscous clutch (100) includes a cover plate (140) defining a seating portion configured to selectively cover an opening (138) from a reservoir (112), a flexible mounting plate (142), and an armature (144) that is movable in response to applied magnetic flux to move the cover plate (140) relative to the opening (138) from the reservoir (112). The armature (144) includes a base portion (146) connected to the cover plate (140) and the mounting plate (142), and a finger (148) extending from the base portion (146). The finger (148) and the base portion (146) define a path for conducting magnetic flux.

Abstract: A viscous clutch assembly (100) includes a rotational input structure (110), a rotor (104) attached to the rotational input structure (110), a selectively rotatable member (102) surrounding the rotor (104) and rotatably supported by the rotational input structure (110), an electromagnetic coil (108) positioned relative to a driven side of the rotor (104), a valve assembly (106) supported by the rotor (104), and a magnetic flux circuit for controlling the valve assembly (106) with magnetic flux generated by the electromagnetic coil (108). The valve assembly (106) includes a cover plate (140) for regulating flow of a shear fluid. The rotational input structure (110) comprises a material capable of conducting magnetic flux. The magnetic flux circuit is configured to include no more than four air gaps (G1-G4).

Abstract: A viscous clutch assembly (100) includes a rotor (104), a selectively rotatable member (102) surrounding the rotor and defining a working chamber (114) therebetween, a first opening (126A) defined through the rotor (104) between front and rear sides of the rotor (104) and in fluid communication with the working chamber (114) at both the front and rear sides of the rotor (104), a reservoir (112) supported by the rotor (104) and having a second opening (138), a valve assembly (106) supported by the rotor (106) having a cover plate (140) for selectively covering the second opening (138), and a channel (128,130) defined in the rotor (104) between the first opening (126A) and an area adjacent to the second opening (138). The channel (128,130) is in fluid communication with the first opening (126A).

Abstract: A valve assembly (106) for an electromagnetically actuated viscous clutch (100) includes a cover plate (140) defining a seating portion configured to selectively cover an opening (138) from a reservoir (112), a flexible mounting plate (142), and an armature (144) that is movable in response to applied magnetic flux to move the cover plate (140) relative to the opening (138) from the reservoir (112). The armature (144) includes a base portion (146) connected to the cover plate (140) and the mounting plate (142), and a finger (148) extending from the base portion (146). The finger (148) and the base portion (146) define a path for conducting magnetic flux.

Abstract: Apparatus (300) is disclosed for locking a key (322) in a keyway (302) of a shaft (10) and of a hub slideably receiving the shaft (10). The key (322) is tapered and includes a top extending at an acute angle to the bottom, with the keyway (302) of the shaft (10) having a bottom wall (306) at the acute angle to the axis of the shaft (10). A push rod (312) is rotatable in an axial bore (308) in the shaft (10) and includes a threaded portion (318) threaded into a threaded counterbore (310) of the axial bore (308). The forward end of the push rod (312) is interconnected to the key (322) by a lip (336) formed in the key (322) extending into a notch (316) formed in the push rod (312). Rotation of the push rod (312) causes the push rod (312) to move axially in the axial bore (308) which in turn axially moves the key (322) in the keyway (302).

Abstract: A rotational control apparatus (A) having a rotatable input (26 or 180) and output (26 or 180) with respective interface discs (106, 180). Three sets of two diametrically opposed pistons (64 and 66, 68 and 70, 72 and 74) are controllable to rotatably relate the interface discs (106, 180). The piston sets (64 and 66, 68 and 70, 72 and 74) include piston heads (76) with dissimilar diameters such that each of the sets of pistons (64 and 66, 68 and 70, 72 and 74) may apply a dissimilar torque for a given amount of air pressure. Each of the piston sets (64 and 66, 68 and 70, 72 and 74) may be actuated independently or in combination with each of the other sets of pistons (64 and 66, 68 and 70, 72 and 74) such that the interface discs (106, 180) may be rotatably related to each other with varying degrees of torque.

Abstract: A rotary fluid displacement apparatus (100) with an orbiting toothed ring member (30) is shown with an improved casing (60) and rolling support between the faces of the valve discs (46, 47) and the first and second fluid transfer elements (21, 35). Particularly, needle bearings (106, 112) are sandwiched between thrust washers (108,114) and then between the valve discs (46, 47) and the fluid transfer elements (21, 35), with one of the needle bearings (106) being piloted in an annular groove (110) formed in the annular plate (23) of the first fluid transfer element (21) and the other of the needle bearings (112) being piloted on the hub (35') of the second fluid transfer element (35). The casing (60) includes two pieces, i.e. a generally cylindrical portion (62) and an end cap (64).