JP3711517B2 - Idler pulley - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to an idler pulley.
[0002]
[Prior art and problems]
Conventionally, as shown in FIG. 5, for example, when a belt 3 is mounted between an engine crank 1 and an alternator 2, an idler pulley 4 is attached to stretch the belt 3, and the idler pulley 4 is shown in FIG. The structure is as shown in the perspective view and the side view of FIG. 7. The adjusting bolt 7 is screwed to the shaft 6 assembled to the pulley body 5 in an orthogonal shape and assembled to the bracket 8. However, the bracket 8 is formed with a long hole 9 for adjustment, and is bent to one end side of the bracket 8 to form a bent piece 8a. In the slot 10 formed in the bent piece 8a, Then, after the head 7a side of the adjusting bolt 7 is inserted from below and the adjusting bolt 7 is screwed onto the shaft 6 and assembled, the head 7a side of the adjusting bolt 7 is removed from the groove hole 10. To prevent the, it had formed a drop preventing claw 8c by bending the free end of the bent piece portion 8a on the Ku-shaped.
Thus, conventionally, after the adjustment bolt 7, the shaft 6, and the pulley body 5 are assembled to the bracket 8, it is necessary to form the fall prevention claw 8 c on the bracket 8, and workability is extremely poor. There has been a problem that the processing cost becomes high for processing.
[0003]
[Means for Solving the Problems]
The present invention has been devised in view of the above-described conventional problems, and it is an object of the present invention to provide an idler pulley that can simplify the structure of the bracket, reduce processing costs, and improve workability. The gist of the present invention is an idler pulley that is constructed by assembling a pulley body that is rotatably assembled to a shaft and an adjustment bolt that is screwed perpendicularly to the shaft into the bracket. An insertion hole through which the head of the adjustment bolt is passed is formed in a part of the groove, and a groove for moving the adjustment bolt is formed from the elongated hole to the bent piece at one end of the bracket. The adjustment bolt is moved from the insertion hole into the groove hole in a state where the adjustment bolt is screwed onto the shaft, and the bent piece side is moved. Is that constituted so as to be disposed.
[0004]
【Example】
Embodiments of the present invention will be described below with reference to the drawings.
The bracket 8 constituting the idler pulley 4 of the present example is formed in a structure as shown in FIG. 1, and the bent piece 8a is integrally formed by bending the bracket 8 by approximately 90 °, and the adjustment length is long. A groove hole 10 is continuously formed from the hole 9 to the bent piece portion 8a, and the groove hole 10 is not opened to the lower end of the bent piece portion 8a, and is U-shaped in the bent piece portion 8a. Is formed. An insertion hole 9a is formed in a recessed shape in a part of the adjustment long hole 9, and the head 7a of the adjustment bolt 7 can be passed through the insertion hole 9a.
Reference numeral 11 in the figure denotes an attachment hole, and after assembly, the idler pulley 4 is attached to the cylinder block cover of the engine through a bolt through the attachment hole 11.
[0005]
In this example, the bracket 8 having such a structure is used, and as shown in FIG. 2, the adjustment bolt 7 is preliminarily screwed onto the shaft 6 and assembled. That is, the adjustment bolt 7 is screwed into the screw hole 6d formed in the large-diameter portion 6a of the shaft 6 and assembled, and in this state, the head 7a of the adjustment bolt 7 is inserted from below. As shown in FIG. 3, the adjustment bolt 7 is moved toward the bent piece 8a along the groove hole 10 as shown in FIG. 3, and finally, as shown in FIG. The head portion 7a is arranged outside the bent piece portion 8a, the retaining rod 7b of the adjustment bolt 7 is arranged on the back side of the bent piece portion 8a, and the head portion 7a side of the adjustment bolt is almost at the lower end of the slot 10. Place them in contact.
[0006]
In this state, the adjustment bolt 7 is in a substantially horizontal state below the bracket 8, and in this state, the shaft 6 is in an upright state, and the small diameter portion 6 b of the shaft 6 enters into the long hole 9, so that the shaft 6 The screw portion 6c protrudes upward, and the pulley body 5 is assembled to the screw portion 6c from the upper side and fastened with a nut to be fixed, thereby completing the assembly.
[0007]
In this example, since the head 7a side of the adjusting bolt 7 is not pulled out from the bent piece 8a, it is not necessary to form the conventional fall prevention claw 8c, and the machining cost is reduced accordingly. In addition, workability is improved.
[0008]
【The invention's effect】
The present invention relates to an idler pulley configured by assembling a pulley main body rotatably assembled to a shaft and an adjustment bolt screwed orthogonally to the shaft to the bracket. The bracket includes a part of an adjustment long hole. An insertion hole through which the head of the adjustment bolt passes is formed, and a groove hole for adjusting bolt movement is formed continuously from the long hole to the bent piece at one end of the bracket, and the adjustment bolt is formed on the shaft. The adjustment bolt can be moved from the insertion hole into the groove hole in a state where the adjustment bolt is screwed, and can be disposed on the bent piece side. Insert the head from the insertion hole, move in the slot, and place the adjustment bolt head on the bent piece side of the bracket and assemble it. It is not necessary to process the fall-preventing claw after assembly as in the past, the bracket structure is simplified, the processing cost is lower than before, and the workability such as assembly is greatly improved than before. Have
[Brief description of the drawings]
FIG. 1 is a perspective configuration diagram of a bracket constituting an idler pulley.
FIG. 2 is an exploded perspective view of a state in which a head of an adjusting bolt screwed to a shaft is inserted into a bracket.
FIG. 3 is an operation explanatory view for further moving the adjustment bolt along the groove hole;
FIG. 4 is a perspective configuration diagram of a final assembled state.
FIG. 5 is a schematic arrangement configuration diagram of idler pulleys attached to an engine.
FIG. 6 is a perspective configuration diagram of a conventional idler pulley.
FIG. 7 is a side view of a conventional idler pulley.
[Explanation of symbols]
3 Belt 4 Idler pulley 5 Pulley body 6 Shaft 6a Large diameter portion 6b Small diameter portion 6c Screw portion 6d Screw hole 7 Adjust bolt 7a Head 7b Detent rod 8 Bracket 8a Bending piece portion 9 Long hole for adjustment 9a Insert hole 10 Groove Hole 11 Mounting hole

Claims (1)

In an idler pulley constructed by assembling a pulley body rotatably attached to a shaft and an adjustment bolt screwed perpendicularly to the shaft to the bracket, the bracket includes a part of the adjustment long hole in the bracket. An insertion hole for passing the head of the adjustment bolt is formed, and a groove hole for adjusting bolt movement extending continuously from the long hole to a bent piece at one end of the bracket is formed, and the shaft has the An idler pulley characterized in that the adjustment bolt can be disposed on the bent piece side by moving the adjustment bolt from the insertion hole into the groove hole in a state where the adjustment bolt is screwed.

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