Fluid Coupling with Partially Curved Impeller Vanes

Abstract

The fluid coupling of the present disclosure transmits torque by a fluid in a variable speed transmission. The fluid coupling comprises a front cover and a back cover, and the front cover and the back cover forming a chamber. The fluid coupling includes a plurality of impeller vanes are located on the back cover and the back cover is configured to rotate in a first direction. The fluid coupling also includes a turbine having a plurality of turbine vanes located within the chamber. The ends of each of the plurality of impeller vanes are curved in the first direction to direct flow of the fluid into the plurality of turbine vanes at a sharper angle thereby increasing torque applied to the turbine.

Claims

1. A fluid coupling to transfer torque by rotating in a first direction thereby rotating a fluid in the first direction to rotate a turbine, the fluid coupling comprising: a front cover and a back cover, the front cover and back cover forming a chamber; the turbine located within the chamber; and a plurality of impeller vanes affixed on an inside of the back cover and a perimeter section of each of the plurality of impeller vanes curving toward the first direction, the perimeter section directing the fluid into the turbine at an angle that applies increased torque to the turbine.

2. The fluid coupling of claim 1, wherein the turbine further comprises a plurality of turbine vanes, a center section, a closed section, and a perimeter section; the center section and the perimeter section of the turbine are open to allow the fluid to pass between the plurality of turbine vanes in the center section and perimeter section; and the closed section of the turbine prevents the fluid from flowing between the plurality of turbine vanes in the closed section.

3. The fluid coupling of claim 2, further comprising a metal plate attached to a back of the turbine over the closed section and blocking fluid flow through the closed section.

4. The fluid coupling of claim 1, wherein the front cover has a toroidal shape.

5. The fluid coupling of claim 1, further comprising a plurality of blades located on an inner surface of the front cover configured to direct the fluid toward the back of the center section of the turbine in a complimentary direction thereby increasing torque applied.

6. The fluid coupling of claim 5, wherein each of the plurality of blades is angled in the first direction to adjust the fluid flow into the center section of the turbine at an angle that increases the torque applied by the fluid.

Description

DESCRIPTION OF THE FIGURES

[0012] FIG. 1 is a side view of the fluid coupling according to the present disclosure;

[0013] FIG. 2 is a side, cross-section view of the fluid coupling of the present disclosure;

[0014] FIG. 3 is a cutaway view of a back cover of the fluid coupling of the present disclosure showing the impeller vanes;

[0015] FIG. 4 is a front view of the turbine that sits within a chamber of the fluid coupling of the present disclosure;

[0016] FIG. 5 illustrates the perimeter section of the impeller vanes directing fluid into the perimeter section of the turbine vanes;

[0017] FIG. 6 is a side view of a second embodiment of the fluid coupling of the present disclosure;

[0018] FIG. 7 is a side, cross-section view of the second embodiment of the fluid coupling of the present disclosure;

[0019] FIG. 8 is a side, cross-section view of a third embodiment of the fluid coupling of the present disclosure; and

[0020] FIG. 9 is a cutaway view looking at a front cover of the third embodiment of the fluid coupling of the present disclosure showing the blades for redirecting fluid flow.

DETAILED DESCRIPTION

[0021] The present disclosure and accompanying figures present an improved fluid coupling that changes the shape and angle of impeller vanes to increase the torque applied by the fluid.

[0022] Referring to FIG. 1, a side view of the fluid coupling according to the present disclosure is shown. The fluid coupling 1 is formed by securing the front cover 2 to the back cover 4. In a transmission, the back cover 4 is configured to receive torque from a vehicle engine (not shown) through an input shaft 5. This input torque is transferred via the turbine shaft 9 to drive the wheels of a vehicle.

[0023] Referring to FIGS. 2 and 3, FIG. 2 illustrates a side, cross-section view of the fluid coupling of the present disclosure according to one embodiment, while FIG. 3 illustrates the impeller vanes affixed to the back cover 4 with the front cover 2 removed. The fluid coupling 1 is comprised of a front cover 2 and a back cover 4 forming a chamber 6. A turbine 8 is situated within the chamber 6. A plurality of impeller vanes 10 are located on the back cover 4. The impeller vanes 10 extend outward radially from a center 12 of the back cover 4 toward a side 14 of the fluid coupling 1. A perimeter section 16 of the impeller vanes 10 is curved in the direction of rotation (arrow A) of the back cover 4. The impeller vanes 10 are straight from the center 12 out to the perimeter section 16. In the perimeter section 16, the ends of the impeller vanes 10 are curved or angled in the direction of rotation.

[0024] The impeller vanes 10 may be affixed to the back cover 4 of the fluid coupling 1. The impeller vanes 10 may be perpendicular to the back cover 4 extending out from a center 12 toward a side 14 of the fluid coupling 1. In this perimeter section, the ends of the impeller vanes 16 are angled or curved in the direction of rotation.

[0025] The turbine 8 has three distinct sections of vanes, a perimeter section 24, a closed section 28, and a center section 22. The center section 22 and the perimeter section 24 are open to allow fluid to pass through adjacent vanes. A metal plate 26 is affixed to the back of the closed section 28 to prevent fluid from passing through.

[0026] In operation, the fluid coupling 1 receives force from an engine (not shown) and begins rotating. As the fluid coupling 1 rotates, the back cover 4 having the impeller vanes 10 begins rotating the fluid within the chamber 6. The rotating fluid then begins acting on the turbine 8 to rotate the turbine 8 which is attached to a drive shaft 9 to transfer torque to the wheels of a vehicle (not shown).

[0027] FIG. 4 illustrates a front view of the turbine 8 removed from the fluid coupling 1. The center section 22 and the perimeter section 24 are open to allow fluid to flow between the turbine vanes 18. A metal plate 26 is attached to the back of the turbine 8 to create the closed section 28 that prevents the fluid from flowing between vanes 18 in the closed section 28.

[0028] FIG. 5 illustrates the flow of fluid 30 as it moves along the impeller vanes 10 to the curved ends in the perimeter section 24. The fluid then flows into the perimeter section 24 of the turbine 8 at a sharp angle resulting in increased torque applied to the turbine 8.

[0029] Referring to FIG. 6, another embodiment of the fluid coupling according to the present disclosure is shown. In this embodiment, the front cover 2 has a torus shape resulting in a semi-toroidal fluid coupling.

[0030] Referring to FIG. 7, a side, cross-section view of another embodiment of the fluid coupling is shown. The torus shape of the front cover 2 directs the fluid into the back of the center section 22 of the turbine 8.

[0031] In some embodiments, the fluid coupling may include blades 32 affixed to the front cover 2 to adjust fluid flowing into the back of the center section 22 of the turbine 8 to further multiply torque on the turbine. The blades 32 may be angled, curved, or slanted in the direction of rotation to direct the fluid 30 into the center section 22 at a sharp angle thereby applying more torque on the turbine 8.

[0032] In another embodiment, the blades 32 on the front cover 2 would be attached to a separate component (not shown) that fits within the torus shape of the front cover 2 such that the vanes could be locked or moved independently of the rotation of the fluid coupling.

[0033] Referring to FIG. 8, another embodiment of the fluid coupling 1 according to the present disclosure is shown with the turbine 8 removed to show the flow of fluid within the fluid coupling 1. In some embodiments, the blades 32 are affixed to the inside of the front cover 2. As the impeller vanes 10 rotate, fluid in the fluid coupling begins to move to the side 14 (shown in FIG. 7) of the fluid coupling 1 (Arrow B). The fluid continues to move around the outer edge of the chamber 6 around the front cover 2 until it reaches the blades 32 (Arrow C). Because the blades 32 are angled or pitched the fluid is then directed back to the center of the back cover 4 to continue being rotated by the impeller vanes 10, thereby multiplying the torque applied.

[0034] FIG. 9 shows a cutaway view of a front cover 2 of a fluid coupling 1 according to the present disclosure showing the blades 32. Arrow C shows fluid flowing along the front cover 2 into the blades 32 affixed on the front cover 2. Arrow D shows the fluid changing direction and moving out away from the front cover 2 back to the back cover 4 to continue being rotated by the impeller vanes 10.

[0035] Although the inventive concepts of the present disclosure have been described and illustrated with respect to exemplary embodiments thereof, it is not limited to the exemplary embodiments disclosed herein and modifications may be made therein without departing from the scope of the inventive concepts.