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Magnetic gear shifter in collar shift transmission

IP.com Disclosure Number: IPCOM000240848D
Publication Date: 2015-Mar-06
Document File: 4 page(s) / 282K

Publishing Venue

The IP.com Prior Art Database

Abstract

This technical disclosure proposes a gear shifter arrangement in a collar shift transmission using magnet. A magnet is mounted in the shift collar which is free to move axially on the output shaft due to splined connection. The movement of the magnet causes generation of magnetic effect resulting in coupling with the gear. Thus, the shift collar is coupled to the gear. Hence, the torque is transmitted via the shift collar to the output shaft.

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This is the abbreviated version, containing approximately 52% of the total text.

Page 01 of 4

Title: Magnetic gear shifter in collar shift transmission

Abstract:

This technical disclosure proposes a gear shifter arrangement in a collar shift transmission using magnet. A magnet is mounted in the shift collar which is free to move axially on the output shaft due to splined connection. The movement of the magnet causes generation of magnetic effect resulting in coupling with the gear. Thus, the shift collar is coupled to the gear. Hence, the torque is transmitted via the shift collar to the output shaft.

Drawings:

Figure 1:Magnetic Gear Shifter arrangement



Page 02 of 4

Torque transmitted due to magnetic effect

Figure 2: First Gear in Action

Torque transmitted due to magnetic effect

Figure 3: Second Gear in Action



Page 03 of 4

Magnet

Second Gear pair

First Gear pair

Figure 3: Alternate embodiment with a single magnet

Description:

In manual transmissions, normally synchronizers are used to equalize the speeds and engage different gear pairs as per the driver's requirement. The synchronizer assembly includes the components, such as, a shift hub, a fork, a cone clutch and a spring loaded ball to engage slot in a sliding ring. When driver shifts the position of apply lever, the shifting fork in the synchronizer shifts the position of shift collar (which is free to move axially on the shaft due to splined connection) and brings it in contact with desired gear pair. At the same time, the external cone in the collar engages with an internal cone of gear. This results the gear and shift collar got coupled each other and their speed equalized. Then sliding ring (having internal teeth) engaged with the external (dog teeth) on the gear hub.


Page 04 of 4

Hence, the gear pairs become engaged in a meshing configuration to enable torque transmission through the shift collar to the output shaft. However, the synchronizer with cone clutch is plagued with several disadvantages. Some of the disadvantages are listed bel...