Harmonic drive and method for producing harmonic drive
AssigneeSchaeffler Technologies AG & Co. KG
InventorsResat Aras, Richard Baier, Harald Hofmann, Rainer Ottersbach
Life of this patent
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Abstract
A harmonic drive, more particularly in an electromechanical camshaft phaser, comprises a drive element (2), a flexible transmission element (26) connected to the drive element (2) and having external teeth (29), and an output element (4) that is designed as a ring gear and has internal teeth (30) that partially mesh with the external teeth (29). The flexible transmission element (26) is pot-shaped, and is coupled in a torque-transmitting manner to the drive element (2) radially inside the outer teeth (29).
Claims16
A harmonic drive comprising:
- a drive element;
- a flexible transmission element connected to the drive element and having external teeth;
- and
- an output element configured as a ring gear and having internal teeth that partially mesh with the external teeth, the flexible transmission element being pot-shaped, and being coupled in a torque-transmitting manner to the drive element radially inside the external teeth by torque-transmitting surfaces formed as part of the flexible transmission element.
A method for producing a harmonic drive, comprising the following steps:
- providing a pot-shaped drive element configured as a transmission element of a continuously variable transmission, first form-fitting elements being formed on a bottom of the pot-shaped drive element;
- providing a flexible pot-shaped externally toothed transmission element, second form-fitting elements being formed on a bottom of the flexible pot-shaped externally toothed transmission element;
- providing a wave generator configured to deform the pot-shaped externally toothed flexible transmission element;
- providing a pot-shaped internally toothed output element;
- inserting the wave generator into the flexible pot-shaped externally toothed transmission element to form an assembly;
- inserting the assembly into the pot-shaped internally toothed output element;
- sliding the pot-shaped drive element onto the pot-shaped internally toothed output element until a connection suitable for transmitting a torque is established between the first form-fitting elements and the second form-fitting elements;
- and
- securing the pot-shaped internally toothed output element with respect to the pot-shaped drive element in an axial direction by a locking ring.
A harmonic drive comprising:
- a drive element being pot-shaped and including a bottom and a cylindrical outer peripheral surface radially outside the bottom and adjoined to the bottom;
- a flexible transmission element connected to the drive element and having external teeth;
- and
- an output element configured as a ring gear and having internal teeth that partially mesh with the external teeth, the flexible transmission element being coupled in a torque-transmitting manner to the bottom of the drive element radially inside the external teeth,
- wherein the flexible transmission element is pot-shaped and formed as a single piece, the flexible transmission element including a bottom and a cylindrical section radially outside the bottom and adjoined to the bottom, the bottom of the flexible transmission element being coupled in the torque-transmitting manner to the bottom of the drive element,
- wherein the bottom of the drive element includes first form-fitting elements and the bottom of the flexible transmission element includes second form-fitting elements, the first form-fitting elements engaging the second form-fitting elements in the torque-transmitting manner.
Dependencies are inferred from the claim text.