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US 6,886,425 B2Granted
Electromagnetic shift arrangement
AssigneeZF Friedrichshafen AG
InventorRainer Petzold
Life of this patent
Estimating the term…
Abstract
An electromagnetic shift arrangement for a transmission (2) with gear wheels (4, 6) arranged on a gear shift (12) rotatable about an axis (20) which can be non-rotatably connected with the gear shaft (12) to form a ratio step via an axial movement of a shift dog (18) along the axis (20). An electromagnetic device (24, 26, 40) is provided which is adequate for axial movement of the shift dog (18) along the axis (20). The electromagnetic device (24, 26, 40) is disposed in the area of the shift dog (18) and acts upon the shift dog (18) directly without shift fork.
Claims14
An electromagnetic shift arrangement for a transmission (2) comprising:
- a first gear wheel (4) and a second gear wheel (6) rotatably disposed around an axis (20) of a gear shaft (12) to form a ratio step for the transmission (2);
- a shift dog (18) non-rotatably connected to and axially movable along said axis (20) of said gear shaft (12) is situated between the first and the second gear wheels;
- an electromagnetic device (24,26,40) positioned axially adjacent said shift dog (18), to axially move said shift dog (18) in two directions along said axis (20) without a shift fork;
- and
- a first position in which an electromagnetic field generated by the electromagnetic device axially moves the shift dog in a first operational direction to engage with one of the first and the second gear wheel (4, 6) and a second position wherein the electromagnetic field generated in said electromagnetic device (24,26,40) is reversed to move the shift dog in an opposing second operational direction to disengage with one of the first and second gear wheel (4, 6), wherein
- by control of said electromagnetic device (24, 26, 40) different load reduction times can be adjusted, and wherein
- by means of the control a reversal of the electromagnetic field is produced to form a damping device against an impact of said shift dog (18) with the first and second gear wheels (4, 6).
4 more elements
An electromagnetic shift arrangement for a transmission (2) comprising:
- a first gear wheel (4) and a second gear wheel (6) rotatably disposed around an axis (20) of a gear shaft (12) to form a ratio step for the transmission (2);
- a single shift dog (18) non-rotatably connected to and axially movable along said axis (20) of said gear shaft (12) is situated between the first and the second gear wheels;
- an electromagnetic device (24,26,40) positioned axially adjacent said shift dog (18), to axially move said shift dog (18) in two directions along said axis (20) without a shift fork;
- and
- a first position in which an electromagnetic field generated by the electromagnetic device axially moves the shift dog in a first operational direction to engage with the first gear wheel (4) and a second position wherein the electromagnetic field generated in said electromagnetic device (24,26,40) is reversed to move the shift dog in an opposing second operational direction to engage with the second gear wheel (6), wherein
- by means of the control a reversal of the electromagnetic field is produced to form a damping device against an impact of said shift dog (18) with the first and second gear wheels (4, 6), and wherein
- by control of said electromagnetic device (24, 28, 40) different load reduction times can be adjusted.
4 more elements
An electromagnetic shift arrangement for a transmission (2) comprising:
- a first gear wheel (4) and a second gear wheel (6) rotatably disposed around an axis (20) of a gear shaft (12) to form a ratio step for the transmission (2);
- a single shift dog (18) for engaging one of the first and the second gear wheels is non-rotatably connected to and axially movable along said axis (20) of said gear shaft (12) between the first and the second gear wheels;
- a single moveable shift disc (22) connected to and radially supported by the shift dog about the gear shaft axis (20);
- an electromagnetic device (24, 26,40) generating a reversible electromagnetic field is positioned along the gear shaft axis (20) axially between the shift disc (22) and at least one of said first and second gear wheels;
- and
- wherein to move said shift dog into engagement with one of said first and second gear wheels said reversible electromagnetic field draws the moveable shift disc (22) to move in a first direction axially towards the electromagnetic device, and when reversed, repels the shift disc (22) to move in a second direction axially away from the electromagnetic device along said gear shaft axis (20).
3 more elements
Dependencies are inferred from the claim text.