Eddy-current-type reduction gear

Abstract

A single-row rotating-type eddy-current-type reduction gear, wherein the number of components is not large, and low cost is achieved and the amount of operating power needed during switching between braking on and braking off is reduced while further reduction in the size of the device is achieved. A magnet support member (4) for a ferromagnetic material in which permanent magnets (3) are arranged with a constant interval therebetween is provided facing a braking drum (2) so as to be able to rotate through a necessary angle, so that magnetic poles are in opposite orientations to each other in the circumferential direction of the braking drum (2), which is attached to a rotating shaft (1). A support (3) in which a group of pole pieces (5) of a ferromagnetic material arranged at basically the same angle positions as the permanent magnets (3) is provided with support members (6a) of a non-magnetic material interposed between the pole pieces (5) is provided between the group of permanent magnets and the braking drum (2). Notch parts (5a) are provided in sides of the plurality of pole pieces (5) facing the permanent magnets (3), on front end sides in the direction in which the magnet support member (4) moves during switching from braking off to braking on.

Description

technical field [0001] The present invention relates to an eddy current type deceleration device (hereinafter referred to as a decelerator) for a vehicle mounted as an auxiliary brake on, for example, a large or medium-sized bus or truck. In particular, an eddy current type speed reducer is intended to reduce the operating force (hereinafter, referred to as the required operating force) required for switching between start braking and stop braking. Background technique [0002] For example, in the case of a large vehicle such as a truck or a bus, in addition to a service brake (friction brake) as a main brake, an engine brake and an exhaust brake are mounted as auxiliary brakes. In recent years, the performance of engine brakes and exhaust brakes has been reduced due to the downsizing of engines mounted on vehicles, and thus the introduction of speed reducers to enhance auxiliary brakes has become more common. [0003] The speed reducer is roughly divided into a method usin...

AI Technical Summary

Problems solved by technology

However, in order to further reduce the cost and size of the entire device, in the speed reducer proposed in Patent Document 4, the power of the air cylinder is insufficient.

On the other hand, if a cylinder that satisfies the specified push-pull force is used, it will not be possible to achieve low cost and miniaturization

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