DUAL CAM SPRING-LOADED SHIFTING TRANSMISSION ASSEMBLY
First Claim
1. A shifting system comprising:
- a gear assembly including,a gear shaft,at least one gear mounted on the gear shaft, andat least one shift dog axially movable on the gear shaft while locked to a rotation of the gear shaft, the at least one shift dog configured to selectively lock rotation of the at least one gear to the at least one shift dog;
a shift rail assembly including,a shift rail,at least one shift fork axially movable on the shift rail, the at least one shift fork having a first end engaged with the at least one shift dog of the gear assembly, the at least one shift fork further have a second end with spaced side walls and a shift fork pin extending from one of the spaced side walls,at least one shift collar axially movable on the shift rail between the spaced side walls of the at least one shift fork, the at least one shift collar having a shift collar pin, andat least one biasing member configured to bias the at least one shift collar against one of the spaced side walls of the at least one shift fork; and
a shift drum assembly configured to rotate during a shift, the shift drum having at least one shift guide profile that receives at least one of the shift fork pin and the shift collar pin to guide the at least one shift fork during a shift of the shifting system.
1 Assignment
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Accused Products
Abstract
A shifting system is provided that includes at least one shift fork and shift collar. The at least one shift fork is axially movable on a shift rail. The at least one shift fork further has a second end with spaced side walls and a shift fork pin. The shift collar is axially movable on the shift rail between the spaced side walls of the at least one shift fork. The at least one shift collar has a shift collar pin. A biasing member is configured to bias the at least one shift collar against one of the spaced side walls of the at least one shift fork. A rotating shift drum has at least one shift guide profile that receives at least one of the shift fork pin and the shift collar pin to guide the at least one shift fork during a shift of the shifting system.
14 Citations
20 Claims
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1. A shifting system comprising:
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a gear assembly including, a gear shaft, at least one gear mounted on the gear shaft, and at least one shift dog axially movable on the gear shaft while locked to a rotation of the gear shaft, the at least one shift dog configured to selectively lock rotation of the at least one gear to the at least one shift dog; a shift rail assembly including, a shift rail, at least one shift fork axially movable on the shift rail, the at least one shift fork having a first end engaged with the at least one shift dog of the gear assembly, the at least one shift fork further have a second end with spaced side walls and a shift fork pin extending from one of the spaced side walls, at least one shift collar axially movable on the shift rail between the spaced side walls of the at least one shift fork, the at least one shift collar having a shift collar pin, and at least one biasing member configured to bias the at least one shift collar against one of the spaced side walls of the at least one shift fork; and a shift drum assembly configured to rotate during a shift, the shift drum having at least one shift guide profile that receives at least one of the shift fork pin and the shift collar pin to guide the at least one shift fork during a shift of the shifting system. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A shifting system comprising:
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a shift drum assembly having a plurality of cam tracks; at least one shift dog; at least one gear, the at least one shift dog configured to selectively engage the at least one gear; a shift rail; at least one shift fork having a first end engaged with the at least one shift dog and a second end slidably coupled to the shift rail, the second end of the at least one main shift fork having a shift fork pin received in a first cam track of the plurality of cam tracks of the shift drum assembly; at least one sub-fork further slidably coupled to the shift rail, the at least one sub-fork having a sub-fork pin received in a second cam track of the plurality of cam tracks of the shift drum assembly; and a biasing member for each at least one sub-fork received around the shift rail, the at least one sub-fork and biasing member positioned such that pushing the at least one sub-fork in a first direction causes it to solidly push against a first sidewall of the second end of the at least one shift fork so that the at least one sub-fork moves in concert with the at least one shift fork, the at least one sub-fork and biasing member further positioned such that movement of the at least one sub-fork in a second direction on the shift rail pushes against the biasing member which in turn pushes against a second sidewall of the second end of the at least one shift fork compressing the biasing member to create a preload bias that is used at least in part to pass thru the at least one gear without requiring shift dog teeth of the at least one shift dog and at least one gear to fully mesh. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A vehicle comprising:
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a motor to provide motor torque; a transmission to receive the motor torque; a drivetrain coupled to receive torque from the transmission; and a shifting system including, a shift rail assembly including, a shift rail, at least one shift fork axially movable on the shift rail, the at least one shift fork having a first end engaged with at least one shift dog of a gear assembly of the transmission, the at least one shift fork further have a second end with spaced side walls and a shift fork pin extending from one of the spaced side walls, at least one shift collar axially movable on the shift rail between the spaced side walls of the at least one shift fork, the at least one shift collar having a shift collar pin, at least one biasing member configured to bias the at least one shift collar against one of the spaced side walls of the at least one shift fork; and a shift drum assembly configured to rotate during a shift, the shift drum having at least one shift guide profile that receives at least one of the shift fork pin and the shift collar pin to guide the at least one shift fork during a shift of the shifting system. - View Dependent Claims (17, 18, 19, 20)
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Specification