Device for contactless speed measurement on SIMSON engines of type M500-700

The device with a permanent magnet encoder and sensor adapter offers a contactless, wear-free solution for SIMSON engines, enabling easy integration of electronic sensors while preserving engine integrity.

DE202025002716U1Active Publication Date: 2025-12-31BÄSE STEFAN
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Patent Information

Application Number
DE202025002716
Authority / Receiving Office
DE · DE
Patent Type
Utility models
Current Assignee / Owner
Filing Date
2025-09-15
Publication Date
2025-12-31
Estimated Expiration
2035-09-30

AI Technical Summary

Technical Problem

Mechanical transmission of speed signals in SIMSON M500-700 series engines is prone to wear and limits integration of modern electronic sensors.

Method used

A device comprising an adapter with a permanent magnet encoder and an active or inductive sensor that transmits the speed signal contactlessly, using the original fastening mechanisms.

Benefits of technology

Provides a wear-free, contactless speed signal transmission compatible with electronic sensors, easy integration, and maintains engine design integrity.

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Abstract

Device for contactless transmission of rotational speed to an active or inductive sensor, comprising a. a sensor (1) which is provided in place of the screw pinion of the SIMSON M500 / M700 engine series, which is mounted on a shaft and has a permanent magnet (3) located inside, b. and an adapter (4) which is provided in place of the worm gear of the SIMSON M500-700 engine series and forms a receptacle for a sensor (5), wherein the sensor (5) detects the magnetic field of the permanent magnet (3) without contact.
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Description

Technical field

[0001] The invention relates to a device in the field of two-wheeler technology, in particular for contactless detection of the rotational speed on shafts of motors, preferably SIMSON motors of the type M500-700. State of the art

[0002] The speed signal on SIMSON M500-700 series engines is currently transmitted mechanically from the output shaft to a speedometer cable via a pinion gear and helical wheel. This purely mechanical signal transmission is prone to wear, requires intensive maintenance, and offers only limited possibilities for integrating modern electronic sensors. Object of the invention

[0003] The object of the invention is to provide a device that enables wear-free, contactless transmission of the speed signal, replaces the existing mechanical signal transmission and allows for easy integration of electronic sensors. Solution to the task

[0004] The task is solved by a device consisting of an adapter for the sensor and a transmitter. • The sensor is mounted on the output shaft and contains a permanent magnet inside. This generates an alternating magnetic field when the shaft rotates. • The adapter replaces the conventional screw wheel. An active or inductive sensor can be installed and securely fixed in the adapter. • The magnetic field of the encoder is detected by the sensor without contact and converted into an electrical signal that represents the rotational speed. • The sensor and adapter are attached using the original locking mechanisms, so no additional fasteners or modifications to the engine are necessary. Advantages of the invention

[0005] The device offers the following advantages in particular: • Replacement of the mechanical speed measurement with a wear-free, contactless solution, • Use of the original fastening and securing methods for sprockets and adapters, • Easy integration into existing SIMSON M500-700 engine designs by replacing the worm gear and sensor and • Compatibility with active and inductive sensors. Example of implementation

[0006] In a preferred embodiment, the encoder (1) is mounted on a shaft. Inside the encoder (1) is a permanent magnet (3) which generates a rotating magnetic field when the encoder rotates about its axis.

[0007] Instead of the helical gear, an adapter (2) is provided into which a sensor (4) is inserted and secured via the threaded insert (5) with a setscrew (6). The magnetic field of the permanent magnet (3) is detected by the sensor (5) and converted into an electrical signal. This signal is available as rotational speed information for further applications, e.g., for electronic speed displays. Drawing description Fig. Figure 1 shows a side view of the device with transmitter (1), adapter (2), permanent magnet (3), and an example sensor (4). Fig. Figure 2 shows a front view of the device with transmitter (1), adapter (2), example sensor (4). The locking mechanism with threaded insert (5) and setscrew (6) is also shown. Fig. Figure 3 shows a perspective view of the device. Fig.Figures 4-5 show different views of the adapter (2) and the transmitter (1), including top view, section and side views, as well as the cutouts for the locking devices.

Claims

[1] Device for contactless transmission of rotational speed to an active or inductive sensor, comprising a. a sensor (1) which is provided in place of the screw pinion of the SIMSON M500 / M700 engine series, which is mounted on a shaft and has a permanent magnet (3) located inside, b. and an adapter (4) which is provided in place of the worm gear of the SIMSON M500-700 engine series and forms a receptacle for a sensor (5), wherein the sensor (5) detects the magnetic field of the permanent magnet (3) without contact. [2] Device according to claim 1, characterized by that the adapter (2) has a locking mechanism for the sensor (4). [3] Device according to claim 1 or 2, characterized by , that the permanent magnet (3) generates a rotating magnetic field which is detected relative to the shaft depending on the rotational speed.