Shift drum assembly of a transmission
First Claim
1. A shift drum assembly for a gear box of a transmission, the shift drum assembly including:
- a shift drum housing having at least one groove guide with a select profile that is configured to receive at least one shift fork positioning pin of a shift fork, the shift drum housing further having a window, the window including a first side wall and a second side wall;
a shift cam rotationally coupled to the shift drum, the shift cam having a shift cam tab positioned within the window of the shift drum, the shift cam tab configured to selectively move between the first side wall and the second side wall of the window; and
a bias member configured to bias the shift cam in relation to the shift drum to create a preload force used at least in part to complete a shift when a blocked shift condition of the gear box is encountered.
1 Assignment
0 Petitions
Accused Products
Abstract
A shift-by-wire transmission system is provided. The system includes a gearbox that is configured and arranged to receive a rotational input and provide a select rotational output. The gearbox includes a plurality of gear assemblies that are operationally coupled together to provide the select rotational output from the rotational input. A shift assembly is operationally coupled to the plurality of gear assemblies of the gearbox to selectively change gearing of gearbox. An electric motor is operationally coupled to the shift assembly to activate the shift assembly to selectively change the gearing of the gearbox. A manual shift override is employed that is coupled between the shift assembly and the electric motor. The manual shift override is configured and arranged to manually disconnect the electric motor from the shift assembly and activate the shift assembly.
14 Citations
21 Claims
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1. A shift drum assembly for a gear box of a transmission, the shift drum assembly including:
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a shift drum housing having at least one groove guide with a select profile that is configured to receive at least one shift fork positioning pin of a shift fork, the shift drum housing further having a window, the window including a first side wall and a second side wall; a shift cam rotationally coupled to the shift drum, the shift cam having a shift cam tab positioned within the window of the shift drum, the shift cam tab configured to selectively move between the first side wall and the second side wall of the window; and a bias member configured to bias the shift cam in relation to the shift drum to create a preload force used at least in part to complete a shift when a blocked shift condition of the gear box is encountered. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A transmission comprising:
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a plurality of gearing assemblies operationally coupled together to provide a select rotational output from a rotational input of an input shaft to the transmission; at least one shift fork configured and arranged to change gearing of the gearing assembly; a shift drum housing forming at least a portion of at least one groove guide, the at least one groove guide having a select profile that includes a ramp section, the at least one groove guide configured and arranged to receive at least one shift fork positioning pin of the at least one shift fork, the shift drum housing further having a window, the window including a first side wall and a second side wall; a shift cam rotationally coupled to the shift drum, the shift cam having a shift cam tab positioned within the window of the shift drum, the shift cam tab configured to selectively move between the first side wall and the second side wall of the window; and a bias member configured to bias the shift cam in relation to the shift drum to create a preload force used at least in part to complete a shift when a blocked shift condition of a gear box of the transmission is encountered. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. A transmission system for a vehicle implementing a gearbox with shift dogs, the transmission system comprising:
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an input shaft; a plurality of gearing assemblies operationally coupled together to provide a select rotational output from a rotational input of the input shaft; at least one shift fork configured and arranged change gearing of the gearing assembly; a shift drum housing having a window; a shift cam rotationally coupled to the shift drum and forming with the shift drum at least one groove guide with a select profile that is configured to receive at least one shift fork positioning pin of the at least one shift fork, the shift cam having a shift cam tab positioned within the window of the shift drum; and a bias member configured to bias the shift cam in relation to the shift drum to create a preload force used at least in part to complete a shift when a blocked shift condition of the gear box is encountered. - View Dependent Claims (17, 18, 19, 20)
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21. A shift drum assembly for a gear box of a transmission, the shift drum assembly including:
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a shift drum housing having at least one groove guide with a select profile that is configured to receive at least one shift fork positioning pin of a shift fork; a shift cam rotationally coupled to the shift drum; one of the shift drum and the shift cam having a window, the window including a first side wall and a second side wall; another of the shift drum and the shift cam having a tab positioned within the window, the tab configured to selectively move between the first side wall and the second side wall of the window; and a bias member configured to bias the shift cam in relation to the shift drum to create a preload force used at least in part to complete a shift when a blocked shift condition of the gear box is encountered.
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Specification