Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1985-01-02
1987-01-13
Salce, Patrick R.
Electrical generator or motor structure
Dynamoelectric
Rotary
188 70R, 188 74, 310 71, 310 75B, 310 77, B69J 512, H02K 7112
Patent
active
046366709
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention refers to a control gear for a dynamo connected to a hub, particularly a wheel hub and which dynamo is of the type which incorporates a stator and a armature rotatable with the hub, and being arranged radially relative to each other and where the stator or armature can be prevented from rotation by means of a locking device, and where a current collector is arranged to lead off current generated during arresting of stator or armature.
Such a hub-connected dynamo is a suitable design for the current supply of the lighting of a bicycle, even if its use is not limited thereto.
Dynamos of this type, which are used for generation of current for bicycle lighting have been on the market in a plurality of different embodiments and they entail advantages such as reliability, high efficiency, slight influences from weather conditions and the state of the roads, no tire wear and easier prevention of thefts than most conventional arrangements.
In Finnish patent specification No. 40443 is described such a bicycle dynamo incorporating an annular stator body with a stator winding, which is connected to the hub of the bicycle wheel and always participates in the rotation of the bicycle wheel, and a rotatably supported rotor, arranged inside the stator body and arrestable against rotation by means of a control latch, which extends through a covering plate and can be make to assume a current generating position in which the rotor is thus prevented from rotation and which is free to rotate in the second, current free position. Current collectors are arranged in the covering lid.
The problem of this design is that it is rather difficult to operate the dynamo and particularly to disconnect it, which means that the dynamo can cause accidents if during bicycling the bicycle lights need to be turned ON or OFF, as it is thereby necessary to kick with a foot against the control latch which projects from the hub.
THE PURPOSE AND MOST ESSENTIAL FEATURES OF THE INVENTION
The purpose of the present invention is to provide a control gear for a dynamo connected to a hub, particularly a wheel hub and of a type described above, which gear retains the above stated advantages and at the same time has a simpler and more reliable operation.
DESCRIPTION OF THE DRAWINGS
The invention will hereinafter be further described with reference to an embodiment shown in the accompanying drawing.
FIG. 1 shows in a partly sectional view a hub generator having a control gear according to the invention.
FIG. 2 is a corresponding view of a portion of the armature of the generator, and
FIG. 3 shows a part of the control gear.
DESCRIPTION OF THE EMBODIMENT
FIG. 1 shows in a partly sectional view a bicycle hub 2 arranged on a wheel shaft 1, and which is supported on the shaft in two rolling bearings, preferably deep groove ball bearings, one of which is shown at 3, whereas the other is situated at the opposite axial end of the hub. The bicycle hub 2 is thus designed as a bearing housing, but it furthermore has a portion 4 arranged at one of the axial ends which has a bigger diameter. This portion acts as a generator housing and carries on its internal envelope surface magnets 5 in annular form, which constitute a dynamo stator, which rotates with the hub. The armature 6 of the dynamo is arranged radially outside the hub bearing 3 shown in the figure and it is rotatably supported in a rolling bearing 7, preferably a deep groove ball bearing, whereby the armature likewise can take part in the rotational movement of the hub, without thereby causing any appreciable braking effect as the armature is well supported.
The armature 6 is connected to a shaped current collector 8 in form of a ring fixed to one end surface of the armature and having a radially directed outer flange 9.
In FIG. 2 is separately shown armature 6 and current collector 8, and as can be seen herefrom, the current generated is transferred to the current collector via a wire 10. Due to the particular design of the current collector with its
Ingvar Nilsson Mekaniska AB
Rebsch D. L.
Salce Patrick R.
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