JP2531064Y2 - Pulley support device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a pulley support device, and more particularly to a support device capable of adjusting the position of a pulley.

<Prior Art> FIG. 5 shows a conventional example of a pulley supporting device (see Japanese Utility Model Laid-Open No. 57-71835).

That is, a driven body (not shown) such as a cooling fan is attached to one end of the fixed-side mounting bracket 1, and a driven pulley 2 is attached to a drive shaft 2 of the driven body. At the other end of the fixed-side mounting bracket 1, a plurality of elongated holes 4 are formed. A pulley bracket 5 is mounted on the other end of the fixed-side mounting bracket 1, and an idler pulley 6 is rotatably mounted on the pulley bracket 5.

To attach the pulley bracket 5 to the fixed-side mounting bracket 1, the bolt 7 is inserted into each slot 4 and the pulley bracket 5.
And then tightened with bolts 7 and nuts 8.

A V-belt 9 is attached to the idler pulley 6 and the driven pulley 3.
The V-belt 10 is wound around an idler pulley 6 and a driving pulley (not shown). The driving force of a driving device such as a motor is transmitted from the driving pulley to the V-belt 10.
And transmitted to the driven pulley 3 via a V-belt 9 to rotate a driven body such as a cooling fan.

Further, for example, in order to adjust the belt tension of the V-belt 9, after loosening the screw between the bolt 7 and the nut 8, the pulley 6
At the same time, the pulley bracket 5 is moved along the elongated hole 4 to adjust the position of the pulley.

<Problem to be Solved by the Invention> However, in such a conventional pulley support device, since the fixed-side mounting bracket 1 and the pulley bracket 5 are tightened by the general-purpose bolt 7 and the nut 8, the bolt It is necessary to tighten or loosen a tool such as a wrench on the nut 7 and the nut 8, respectively, and there is a problem that these operations become complicated.

As shown in FIG. 6, a rectangular locking portion 12 is formed at the head of the bolt 11, and the locking portion 12 faces the elongated hole 4 to stop the rotation of the bolt 11. There is one in which only a tool (not shown) is turned by a tool.

However, in this case, as shown by the chain line in FIG. 7, the detent portions 12 collide with the inner wall of the long hole 4 at both ends of the long hole 4,
There is a problem that the length of the long hole 4 in the longitudinal direction cannot be effectively used as the moving distance of the pulley (hereinafter, referred to as stroke length).

The present invention has been made in view of such circumstances.
An object of the present invention is to provide a pulley support device that facilitates a pulley position adjustment operation and that can effectively use the length of a long hole as a stroke length of a pulley.

<Means for Solving the Problems> For this reason, the present invention provides a guide portion which is engaged with the side wall of the long hole and is slidable in the long direction of the long hole along the long hole. Is formed only on one side with respect to the bolt center.

<Operation> The tightening or loosening operation restricts the rotation of the bolt to rotate the nut so that the work can be performed. Also, the locking portion is prevented from contacting the end of the long hole to prevent the work from being performed. Can be effectively used as the stroke length.

<Example> Hereinafter, an example of the present invention will be described with reference to the drawings.

 1 to 4 show an embodiment of the present invention.

In FIG. 1, a fixed-side mounting bracket 21 as a fixed-side support member has an elongated hole 22 formed therein. A pulley bracket 23 is mounted on the fixed-side mounting bracket 21, and a pulley (not shown) is rotatably mounted on the pulley bracket 23.

Also, a bolt 24 is inserted into the long hole 22 of the fixed-side mounting bracket 21.
Are inserted, and the fixed mounting bracket 21 and the pulley bracket 23 are tightened and fixed by the bolt 21 and the nut 25. As shown in FIGS. 3 and 4, a detent portion 26 is formed on the bolt head 24a of the bolt 24 only on one side with respect to the center of the bolt 24. 22 is faced. Here, both side walls 26a of the locking portion 26 constitute a guide portion.

 27 is a spring washer.

According to such a configuration, since the locking portion 26 is engaged with the side wall of the elongated hole 22, the rotation of the bolt 24 is restricted.
Only the tool can be tightened or loosened simply by rotating it with a tool, so that the operation of the pulley position is facilitated and the space for the operation can be reduced by half. Further, since the bolt 24 is stopped and the nut 25 is rotated and fastened, no extra twist is generated in the bolt 24, so that secure fastening is possible. Further, since the locking portion 26 is formed only on one side of the bolt 24, the locking portion 26 does not come into contact with the R portion at the end of the long hole 22 when the pulley is moved to the right in FIG. 1, for example. Therefore, the bolt 24 can be moved rightward as much as possible, and the length of the elongated hole 22 in the longitudinal direction can be effectively used as the stroke length of the pulley. Further, the weight of the bolt 24 can be reduced. Further, when the pulley bracket 23 moves, the both side walls 26a of the locking portion 26 slide along the side wall of the elongated hole 22, so that the movement of the pulley is stabilized. Moreover, since the locking portion 26 is provided only on one side with respect to the center of the bolt 24, even if the stroke length is increased, the locking portion located on the opposite side to the side on which the stroke length is desired to be increased. The length of the long hole 22 in the longitudinal direction can be sufficiently ensured, and even if a large fastening torque is applied to the bolt 24, the load value acting on the detent portion 26 can be kept small. The corners and the like of the part 26 are plastically deformed and the like, so that the locking part 26 and the long hole 22 cannot be engaged well, and thus the locking part
It is possible to reliably suppress the occurrence of a situation in which the locking function of 26 decreases.

<Effect of the Invention> As described above, the present invention provides a bolt inserted into a long hole with a locking portion that engages with the inner wall of the long hole and has a guide portion on one side with respect to the center of the bolt. Only the bolts are formed, so that tightening or loosening work can be performed by rotating the nut while restricting the rotation of the bolt, so that the work can be easily performed, and the bolt is stopped and the nut is rotated to tighten. With this configuration, no extra twist is generated in the bolt, so that the bolt can be securely fastened. In addition, the length of the elongated hole in the longitudinal direction can be effectively used as the stroke length, and the pulley can be stably moved. In addition, since the locking portion is provided only on one side with respect to the center of the bolt, even if the stroke length is increased, the length of the locking portion located on the side opposite to the side on which the stroke length is desired to be increased. The length of the hole in the longitudinal direction can be sufficiently secured, and even if a large fastening torque is applied to the bolt, the load value acting on the locking portion can be kept small. Due to deformation or the like, the engagement between the locking portion and the elongated hole cannot be satisfactorily performed, so that occurrence of a situation in which the locking function of the locking portion is reduced can be reliably suppressed. .

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention, FIG. 2 is a plan view of the same, FIG. 3 is a front view of a main part of the same, FIG. 4 is a side view of FIG. 3, and FIG. Perspective view showing a conventional example of a pulley device,
FIG. 6 is a perspective view showing another conventional example, and FIG. 7 is a view for explaining the above-mentioned drawbacks. 21: Fixed side mounting bracket, 22: Slotted hole, 23: Pulley bracket, 24: Bolt, 26: Locking part

Claims (1)

(57) [Scope of request for utility model registration] An elongated hole for adjusting the position of the pulley is formed in one of a pulley support member for rotatably supporting the pulley and a fixed support member for fixedly supporting the pulley support member. A pulley support device in which a bolt is inserted through a hole and the pulley support member and the fixed-side support member are fastened and fixed by the bolt and the nut. A pulley supporting device, wherein a locking portion having a guide portion slidable in the longitudinal direction of the long hole along the hole is formed only on one side with respect to the center of the bolt.