JPH03168462A - Toothed pulley - Google Patents

Abstract

PURPOSE:To decrease a number of mounted part items by providing a start point detecting signal generating member in a one location in the web part of a toothed pulley and providing rotational angle detecting signal generating members over the total periphery in this web part at a fixed space. CONSTITUTION:As a start point detecting signal generating member 1, a long dimensional protruding part is provided in a single location of web part. As a rotary angle detecting signal generating member 2, short dimensional protruding parts are repeatedly provided with a fixed space over the total circumference in the web part. Signal detecting members 3, 4 are set up respectively corresponding to each signal generating member 1, 2. Since a toothed pulley is thus provided integrally with the signal generating members in itself a number of mounted part items for measuring a rotational angle can be decreased.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a toothed pulley having a rotation angle detection function.

Conventional Technology Toothed pulleys can transmit power without slipping when combined with a toothed belt, and are used to drive the camshafts of four-stroke internal combustion engines. The toothed pulley itself does not have the function of detecting the rotation angle, but a separate device is attached to the camshaft etc. to measure the rotation angle and determine the ignition timing and fuel injection timing of the internal combustion engine. Ta.

Problems to be Solved by the Invention In the above case, there is a problem that the structure for detecting the rotation angle becomes complicated and the number of component parts increases. An object of the present invention is to provide a toothed pulley that can reduce the number of components for adjusting the rotation angle.

Means for Solving the Problems In order to solve the above problems, the toothed pulley according to the present invention has one location on the web portion for detecting the starting point and a constant location over the entire circumference for detecting the rotation angle. Signal generating members are provided at intervals.

Operation The toothed pulley according to the present invention is used in combination with a means for detecting signals from a signal generating member for detecting a starting point and for detecting a rotation angle. When the signal from the signal generating member for detecting the starting point is detected, the position is always set to 0°, and each time a signal from the signal generating member for detecting the rotation angle is detected, the angle of one steno knob is added to determine the rotation angle.

Since the pulley itself is equipped with a signal generating member, there is no need to provide a separate signal generating means on the camshaft or the like.

Embodiment The drawings show a toothed pulley according to an embodiment of the present invention. As the starting point detection signal generating member 1, a long convex portion is provided at one location on the web portion.

Further, as the rotation angle detection signal generating member 2, short convex portions are repeatedly provided at regular intervals on the web portion over the entire circumference. As shown in FIG. 3, signal detecting members 3 and 4 are installed in each signal generating member 2 in a corresponding manner. The detection members 3 and 4 are ultrasonic sensors, optical sensors, etc.

Further, the signal generating member may be one in which the north pole and the south pole of a magnet are arranged at a predetermined pitch. For detecting the starting point, magnets may be placed at I locations in a different trunk from the track where the N-pole and S-pole are repeated at the predetermined pinch, or the magnetism of only one magnet on the same track may be strengthened, or Make it smaller.

These are detected by a magnetic sensor and used as a means of measuring the rotation angle.

Effects of the Invention As described above, the toothed pulley according to the present invention is integrally equipped with a signal generating member, so that the number of parts mounted for rotation angle measurement can be reduced.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing an embodiment of a toothed pulley according to the present invention, Fig. 2 is a side sectional view of Fig. 1, and Fig. 3 shows how a signal from a signal generating member is detected. It is a main part explanatory diagram. 1 is a starting point detection signal generating member, 2 is a rotation angle detection signal generating member

Claims (1)

[Scope of Claims] 1. A toothed pulley in which signal generating members are provided at one location on the web portion of the toothed pulley for detecting a starting point and at regular intervals over the entire circumference for detecting a rotation angle. 2. The toothed pulley according to claim 1, wherein the signal generating member is uneven. 3. The toothed pulley according to claim 1, wherein the signal generating member is a magnet.