JPH0228293Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a pulley in which a notch groove for confirming the rotational position of the pulley body is provided at the corner of the outer circumferential surface of the rim portion and the side surface.

(Prior art) Conventionally, this type of pulley has, for example, a fifth pulley.
2. Description of the Related Art There is a pulley for checking the ignition timing of an automobile engine as shown in FIGS. i.e. 100
is a pulley attached to a crankshaft 101, for example, and is adapted to drive a distributor (not shown) via a belt 102 wound around the pulley 100. This pulley 1
00 rim part 103 Corner part 104 between the outer peripheral surface and the side surface
A cutout groove 106 corresponding to, for example, the top dead center position of the piston is provided, so that the position of the piston can be confirmed by checking the rotational position of the pulley. A mark is provided near the pulley 100, for example, at a position that provides the optimum ignition timing according to the engine characteristics, and the ignition timing is adjusted so that the notch groove 106 matches the mark. The cutout groove 106 has a substantially V-shaped cross section and is formed at a predetermined angle α from the side surface of the rim portion 103 of the pulley 100.
It is provided in a straight line with a slant.

(Problem to be solved by the invention) However, in the case of such a conventional example, the notch groove 10
Although it is desirable that the length H of 6 is longer, it will be easier to align with the mark.
6, the depth d of the notch groove 106 must be increased. However, the notch groove 10
If the depth d of No. 6 is increased, the corner portions 104 on both sides of the notch groove 106 become an obstruction, making visual confirmation difficult. Therefore, the width l of the notch groove 106
It is conceivable to make the corner portion 104 wider so that the corner portion 104 does not get in the way, but if the width l of the cutout groove 106 is increased, there is a problem that alignment with the mark cannot be performed accurately.

The present invention was made to solve the problems of the conventional example described above, and its purpose is to chamfer the corners of the outer circumferential surface of the rim and the side surfaces, and to provide a notch in the chamfer for position confirmation. To provide a pulley in which the rotational position of a pulley body can be easily and accurately confirmed by providing a groove.

(Means for solving the problem) In order to achieve the above purpose, in the present invention,
The corners of the outer circumference and side surfaces of the rim are chamfered, and the chamfers are provided with cutout grooves for confirming the rotational position of the pulley body.

(Example) The present invention will be explained below based on the illustrated example. A first diagram showing a pulley according to an embodiment of the present invention.
In the drawings to FIG. 4, reference numeral 1 denotes a pulley body, which in this embodiment is divided into a rim part 2 and a hub part 3 disposed coaxially on the inner circumferential side of the rim part 2. , an annular elastic body 4 is interposed between the rim portion 2 and the hub portion 3. Two V-grooves 5 for winding a belt are provided on the outer peripheral surface of the rim portion 2. The hub portion 3 is a metal ring and is composed of a cylindrical portion 31 and a flange portion 32 extending radially inward from one side edge of the cylindrical portion 31 over the entire circumference. It is attached to the crankshaft 6. The rotation of the crankshaft 6 is transmitted to a distributor (not shown) via a belt 7 wrapped around the pulley body 1.

A corner 8 where the outer peripheral surface and the side surface of the rim portion 2 intersect is chamfered at a predetermined angle α'. This chamfered part 9 is used to confirm the rotational position of the pulley body 1, which extends over approximately the entire width H' of the chamfered part 9 from the side surface of the rim part 2 to the outer peripheral surface at an inclination angle that is approximately the same as the tapered surface of the chamfered part 9. A cutout groove 10 is cut at a predetermined depth d'. The cutout groove 10 has a substantially V-shaped cross section and is carved along the radial direction of the rim portion 2. Chamfered part 9
may be provided over the entire circumference of the rim portion 2 or may be provided on a part of the corner portion 8. On the other hand, pulley body 1
A positioning part 11 is provided nearby, for example, with a mark attached to a position where the optimum ignition timing is determined according to the engine characteristics, and the ignition timing is adjusted so that the notch groove 10 matches the positioning part 11. .

For the pulley with the above configuration, for example, when adjusting the ignition timing of the engine, the timing adjustment is performed by, for example, adjusting the ignition timing of the distributor, and then flashing a strobe in accordance with the ignition timing. Check to see if the position of the notch groove 10 at the time of strobe irradiation (at the time of ignition) matches the mark on the positioning part 11, and if it does not match, adjust the ignition timing again. The position of the notch groove 10 is then confirmed. The notch groove 10 provided in the pulley body 1 is carved into the chamfered part 9 by chamfering the corner 8 of the pulley body 1, so the length of the notch groove 10 can be increased without increasing the depth of the groove. This makes it easy to confirm the position. Furthermore, the width of the groove is narrow, allowing accurate position confirmation. In addition, since the elastic body 4 is interposed between the rim part 2 and the hub part 3 of the pulley body 1, vibrations in the torsional direction are reduced by the elastic body 4, making rotation smoother and position confirmation also affected by vibrations. It can be done easily without any problems.

Although this embodiment has been described with reference to the case where the ignition timing of the engine is adjusted, the present invention can be applied to various other devices for checking the rotational position of a pulley.

(Effects of the invention) The present invention consists of the above-mentioned structure and operation, and the corners of the outer peripheral surface and side surface of the pulley rim are chamfered, and a notch groove for position confirmation is provided in the chamfered part. In this way, the length of the notch groove can be made longer without making it deeper, and the corners do not get in the way and make it difficult to check the notch groove, making it easier to confirm the position. The effect is that it can be done accurately.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view of a pulley according to an embodiment of the present invention, Fig. 2 is a front view of the pulley shown in Fig. 1, Fig. 3 is an enlarged sectional view of the notch groove shown in Fig. 1, and Fig. 4 is a view taken from the X' direction in Fig. 3, Fig. 5 is a vertical cross-sectional view of a conventional pulley, Fig. 6 is a front view of the pulley shown in Fig. 5, and Fig. 7 is a cutout of Fig. 6. FIG. 8 is an enlarged cross-sectional view of the groove portion as seen from the X direction in FIG. 7. Explanation of symbols: 1...Pulley main body, 2...Rim part, 4...Elastic body, 8...Corner part, 9...Chamfered part, 10...Notch groove.

Claims (1)

[Scope of utility model registration request] A pulley characterized in that the corners of the outer circumferential surface and the side surface of the rim are chamfered, and the chamfered portions are provided with cutout grooves for confirming the rotational position of the pulley body.