JP2000337463A - Tension device of belt for power transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce interval pitch of fitting bolts and to make a bracket small size and lightweight by communicatedly providing a branch groove hole extending in the lateral direction from a slotted groove hole on the bracket, and mutually moving a pulley for tension between the slotted groove hole and the branch groove hole. SOLUTION: A bracket 9 is fitted to an internal combustion engine by a plurality of bolts 8, provided with a slotted groove 10 extending in the direction of tensing a belt to insert the supporting shaft 11 of a pulley 7 for tension slidably in the lengthwise direction. A branch groove 15 communicated to the slotted groove hole 10 and extending in the lateral direction is drillingly provided, and the supporting shaft 11 of the tension pulley 7 is mutually moved between the slotted groove hole 10 and the branch groove hole 15. Hereby, an overlapped territory of the pulley 7 (parallel oblique line) in the condition of moving the pulley 7 to the one end of the slotted groove hole 10 (one-dot chain line), the condition of moving to the other end (two-dot chain line), and the condition of moving to fit to the branch groove hole 15, is narrowed, and hence the interval pitch of the bolts 8 can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tension device for tensioning a belt wound around a plurality of pulleys for power transmission in an internal combustion engine or the like.

[0002]

2. Description of the Related Art Conventionally, in this type of tension device, a bracket is mounted on a body of an internal combustion engine or the like with a plurality of bolts, and a tension pulley around which a belt is wound is mounted on the bracket. The belt is mounted so as to reciprocate in a tensioning direction.

However, in this conventional tensioning device, the support shaft of the tension pulley is inserted into a long slot formed in the bracket so as to extend linearly in the direction in which the belt is tensioned. Since the configuration is such that the bracket is movably fitted in the longitudinal direction, there is a problem that the size of the bracket is increased as described in detail below.

An object of the present invention is to provide a tension device that solves this problem.

[0005]

In order to achieve this technical object, the present invention provides a method of mounting a tension pulley on which a power transmission belt is wound around a body of an internal combustion engine or the like with a plurality of bolts. A bracket provided on the bracket so as to reciprocate in a direction in which the belt is tensioned along a long hole formed in the bracket, wherein the bracket has a branch groove extending laterally from the long hole. The tension pulley is bored in communication with the long slot so that the tension pulley can move between the long slot and the branch slot.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

In this figure, reference numeral 1 denotes an internal combustion engine,
Reference numeral 2 denotes a pulley fitted to the crankshaft 3 of the internal combustion engine 1, and reference numerals 4 and 5 denote pulleys of an engine accessory such as an alternator or a lubricating oil pump for the internal combustion engine 1, respectively. , 4,5
A belt 6 for transmitting the rotation of the crankshaft 3 to the engine auxiliary machine is wound.

Reference numeral 7 denotes each of the pulleys 2, 4, 5
A pulley for tension disposed so as to wind the belt 6 is shown at a portion between the two. The pulley 7 for tension is connected to a plurality of (three) bolts 8 with respect to the internal combustion engine 1. The belt 6 is attached to a bracket 9 attached by
Is mounted so as to reciprocate in the direction of tension.

That is, a long slot 10 extending in the direction in which the belt 6 is tensioned is formed in the bracket 9, and the support shaft 1 of the tension pulley 7 is provided in the long slot 10.
1 is slidably fitted in the longitudinal direction of the long slot 10, and the tip of a tension bolt 13 whose one end is supported by one end 9 a of the bracket 9 is screwed into the connecting piece 12 engaged with the support shaft 11. The tension pulley 7 is configured to reciprocate in a direction in which the belt 6 is tensioned by the tension bolt 13, while the support shaft 11 is attached to one end of the support shaft 11 by a bracket. A nut 14 is provided to fasten the tension pulley 7 with the nut 9, and the tension pulley 7 can be fixed at an arbitrary moving position by fastening the nut 14.

As shown in FIG. 3, the bracket 9 is provided with a branch slot 15 communicating with the slot 10 and extending laterally from the slot 10 so as to support the tension pulley 7. The shaft 11 is configured to be able to move between the long slot 10 and the branch slot 15 mutually.

In this configuration, the tension pulley 7
When the tension is attached to the internal combustion engine 1 and the belt 6 is tensioned, the tension pulley 7 is assembled such that the support shaft 11 is inserted into the long slot 10 of the bracket 9, and in this state, the bracket 9 is mounted. Is attached to the internal combustion engine 1 by fastening a plurality of bolts 8, then the belt 6 is wound around the tension pulley 7, and then a tension bolt 13 is assembled. The pulley 7 is moved to tension the belt 6 appropriately, and the tension is maintained by fastening the nut 14.

When mounting the bracket 9 on which the tension pulley 7 is assembled to the internal combustion engine 1 with a plurality of bolts 8, the tension pulley 7 is moved along the slot 10 in the bracket 9. The bolts 8 are fastened while moving from one end to the other end.

However, in this case, the bracket 9
Is not provided with a branch slot 15 and therefore the slot 10
However, when the pulley 7 is linear as shown in FIG. 4, the pulley 7 is moved to one end of the slot 10 as shown by a dashed line in FIG. Pulley 7 in a state where it is moved to the other end of the long slot 10.
Since the overlapping area (the area shaded in parallel in FIG. 4) is widened, the plurality of bolts 8 cannot be fastened unless they are arranged outside the overlapping area. In other words, since the pitch between the bolts 8 must be increased by the width of the overlapping area, the size of the bracket 7 increases accordingly.

On the other hand, as described above, the bracket 9 is provided with the branch groove 15 extending in the lateral direction from the long groove 10 so that the tension pulley 7 is fitted in the branch groove 15. When the pulley 7 is configured to be movable, the pulley 7 is moved to one end of the slot 10 as shown by a dashed line in FIG. In addition to the state where the pulley 7 is moved to the other end and the state where the pulley 7 is moved so as to fit into the branch slot 15 as shown by a three-dot chain line in FIG. 4) is narrower than the case where the long slot 10 is formed in a straight line as shown in FIG. 4, so that the pitch between the bolts 8 can be reduced.

It should be noted that, instead of forming the branch slot 15 so as to communicate with one end of the slot 10, the branch slot 15 extends so as to communicate with the other end of the slot 10 or the middle of the slot 10. It is needless to say that the present invention can be applied not only to the power transmission belt in the internal combustion engine but also to a power transmission belt in another machine.

[0016]

As mentioned above, according to the present invention, according to the present invention, the bracket is provided with the branch slot extending laterally from the long slot.
The bracket is attached to a body such as an internal combustion engine by drilling the tension pulley in communication with the slot so that the tension pulley can move between the slot and the branch slot. Since the pitch between the plurality of bolts can be reduced, the bracket can be reduced in size and weight.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of the present invention.

FIG. 2 is an enlarged sectional view taken along line II-II of FIG.

FIG. 3 is a sectional view taken along line III-III of FIG. 2;

FIG. 4 is a diagram showing a state before the present invention is reached.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Internal-combustion engine 2 Pulley of crankshaft 4, 5 Pulley for engine accessories 6 Belt 7 Pulley for tension 8 Bolt 9 Bracket 10 Long slot hole 11 Pulley support shaft 13 Tension bolt

Claims (1)

[Claims] 1. A tension pulley around which a power transmission belt is wound is attached to a bracket attached to a body of an internal combustion engine or the like with a plurality of bolts along a long slot formed in the bracket. A tension device provided so as to reciprocate in a direction in which the tension is applied to the bracket. The power transmission belt tensioning device is provided so as to communicate with the long slot so as to be able to move mutually.