JPH11264323A - Attaching structure for alternator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a belt laid over a crank shaft pulley with specified tensile strength by supporting an alternator to an engine oscillatably around an axis crossing with its own rotary shaft. SOLUTION: In order to adjust tensile strength of a belt for driving an alternator A, the required space is to be increased when the alternator A is moved in a go-away direction from an engine EG. In this attaching structure, the alternator A is attached to the engine EG so as to enable adjusting the position and be driven by a crank shaft pulley CP attached to a crank shaft through the belt. In such a case, the alternator A is supported to the engine EG in such a manner that a driving end of its rotary shaft is rotatable around an axis crossing the rotary shaft in approaching and separating directions in respect to the crank shaft pulley CP.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an alternator mounting structure for an automobile engine.

[0002]

2. Description of the Related Art Conventionally, an alternator is, for example,
As in Japanese Patent Application Laid-Open No. 9-8136, the lower part of the alternator is fixed to the engine body by bolts on the lower bracket, and the upper part is fixed to the upper bracket by bolts so that the position can be adjusted. Specifically, the upper bracket has a long hole curved in an arc shape, and the alternator is fixed to this long hole with bolts and nuts. Then, the bolts of the lower bracket are loosened and the bolts of the upper bracket are moved in the elongated holes so that the tension of the driving V-belt hung on the pulley of the alternator can be adjusted.

In such an alternator mounting structure,
Because the alternator jumps out to the side of the engine body,
There was a problem that the overall width of the engine with the alternator attached was increased. Similarly, in order to adjust the tension of the V belt, pulleys of the alternator,
There is also known a tensioner provided with an idler pulley at a position inside a V-belt which is hung on a water pump and a crankshaft and above an alternator. The tensioner is arranged so that the position can be adjusted from the inside to the outside of the V-belt.

[0004]

In the alternator mounting structure using the tensioner, the winding angle of the alternator of the V-belt may be small. That is,
In order to apply a predetermined tension to the V-belt, the tensioner must be moved outward. As a result,
Since the V-belt located above the alternator moves away from the tangential direction of the pulley of the alternator to the outside, the winding angle is reduced. When the V-belt was stretched due to fatigue, the decrease in the wrapping angle became remarkable. As described above, when the winding angle is reduced, the margin of the V-belt is reduced, the reliability is reduced, and the V-belt may be detached from the pulley.

[0005] An object of the present invention is to solve such a problem.

[0006]

In order to achieve the above object, the present invention takes the following measures. That is, in the alternator mounting structure according to the present invention, the alternator is supported by the engine such that the alternator can swing about an axis intersecting the rotation axis of the alternator, and a predetermined tension is applied to the belt applied to the crankshaft pulley. It is configured so that it can be performed.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention relates to an alternator mounting structure for mounting an alternator to an engine so as to be position-adjustable so as to be driven via a belt on a crankshaft pulley attached to a crankshaft. An alternator mounting structure characterized in that the drive end of the rotating shaft is supported by the engine so that the driving end of the rotating shaft approaches and separates from the crankshaft pulley about an axis crossing the rotating shaft.

[0008] With such a configuration, a belt from the crankshaft pulley is hung on the drive end of the alternator with the rotating shaft of the alternator approaching the crankshaft pulley, and the drive end is then moved to the crankshaft. By rotating and positioning the belt in a direction away from the pulley, a predetermined tension can be applied to the belt. In this case, the drive end of the rotating shaft selectively approaches and separates from the crankshaft pulley, so that the distance that the alternator itself separates from the engine can be set to a minimum, and the space required for mounting can be reduced. it can.

[0009]

An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, the alternator A is rotatably supported by a support bracket 1 fixed to the engine EG via a mounting bracket 2. The alternator A includes a driven pulley A1 at the front end of a rotating shaft A0 serving as a driving end, and is driven to rotate by a V-belt 3, which is a belt hung on a crankshaft pulley CP attached to a crankshaft CS of the engine EG. Things. On the upper surface of the alternator A, a mounting block A2 is provided integrally. When viewed from the front, the mounting block A2 has an isosceles triangular shape with an arc-shaped apex, and a through-hole A2 through which a long bolt 4 for attachment penetrates near the apex.
a is provided. The configuration other than the mounting block A2 may be the same as that well known in this field.

The support bracket 1 is fixed by bolts 5 to two cylindrical boss portions EG1 provided by integral molding on the outer surface of the engine EG. The support bracket 1 includes a vertical wall 1a formed of a wall in the height direction of the engine EG screwed to the boss EG1, and the vertical wall 1a.
Horizontal wall 1b extending horizontally from substantially the center in the height direction
And a reinforcing wall 1c that connects the rear edge of the vertical wall 1a and the rear edge of the horizontal wall 1b. A through hole 1d is provided in a front corner portion on the free end side of the horizontal wall portion 1b so that the mounting bracket 2 can be mounted with the bolt 6 and the nut 7. The rotation axis S, which is the center of the through hole 1d, that is, the rotation center of the mounting bracket 2, and substantially the rotation center of the alternator A, and the engine E
The distance between the alternator A and the outer surface of G may be set to a minimum distance necessary for the alternator A to rotate or swing in the horizontal direction. In other words, the distance is set such that the driven pulley A1 of the alternator A is closest to the crankshaft pulley CP and the V-belt 3 is temporarily wrapped around the driven pulley A1, and the front end of the alternator A is located near the engine EG. do it. The rotation axis S is not located on the rotation axis A0 of the alternator A in a state where the alternator A is supported by the support bracket 1, but is offset by a predetermined distance OF outside the rotation axis A0. To position. By offsetting in this manner, the distance of the gap between engine EG and alternator A required for rotation can be reduced.

The mounting bracket 2 is, as shown in FIG.
When viewed from the side, the mounting portion 2a has a channel member shape, that is, a U-shape, and a fixed arm portion 2b extending rearward from the rear end of the mounting portion 2a. The mounting portion 2a includes a base 2aa mounted on the lower surface of the horizontal wall portion 1b of the support bracket 1, and a pair of mounting walls 2ab hanging downward from the front and rear edges of the base 2aa. The mounting wall 2ab is arranged so as to sandwich the mounting block A2 of the alternator A. The shape of the mounting wall 2ab when viewed from the front is an inverted right-angled triangular shape whose apex is formed in an arc shape. The alternator A is formed so as to be able to swing in the left-right direction with the A attached. The fixed arm portion 2b is fixed to a fixing bracket 8 fixed to an outer surface of the engine EG behind the boss portion EG1 for fixing the support bracket 1 by a bolt 9, and includes a rear end of the mounting portion 2a. , And extends rearward in parallel with the rotation axis A0 of the alternator A. The fixing bracket 8 is attached to the boss EG1.
Similarly, it may be a boss integrally formed on the outer surface of the engine EG.

In order to mount the alternator A on the outer surface of the engine EG, first, the support bracket 1 is fixed to the engine EG with two bolts 5. Next, the mounting bracket 2 is temporarily fixed to the support bracket 1. That is,
When the alternator A is not attached, the mounting bracket 2 is located on the lower surface of the horizontal wall 1b of the support bracket 1,
What is necessary is just to attach in the state which can be rotated or rocked in the horizontal direction. Mounting walls 2ab before and after this mounting bracket 2
Position the mounting block A2 of the alternator A between them,
The mounting block A2 is fixed to the mounting wall 2 with the long bolts 4 for mounting.
ab. In this case, since the alternator A may be swung in the left-right direction to adjust the mounting position, the alternator A may be swung by applying force without completely tightening the long bolt 4 and the nut 10. As before.

After the alternator A is temporarily mounted on the support bracket 1 via the mounting bracket 2 as described above, the V belt 3 hung on the crankshaft pulley CP is wound around the driven pulley A1 of the alternator A. At this time, the position of the alternator A is such that the driven pulley A1 is
G, that is, stationary at the closest position to the crankshaft pulley CP (shown by imaginary lines in FIG. 2). In this state, when the V-belt 3 is applied to the driven pulley A1, the V-belt 3 is hung over the crankshaft pulley CP, the driven pulley A1, and the water pulley driving pulley WP with almost no tension.

In this manner, the V belt 3 is connected to the driven pulley A
1 and the fixed arm 2 of the mounting bracket 2
b is moved toward the fixing bracket 8. By the movement of the fixed arm portion 2b, the mounting bracket 2 is rotated about the bolt 6 for mounting the mounting bracket 2 substantially as a rotation center. That is, in this embodiment, since the alternator A is attached to the horizontal wall 1b of the support bracket 1, the rotation axis A0 of the alternator A extends in the horizontal direction, and the bolt 6
Is the axis that intersects the rotation axis A0. Then, the alternator A rotates, and the driven pulley A1, which is the driving end, moves away from the crankshaft pulley CP, that is, in the case of this embodiment, from the inside to the outside of the V-belt 3 in the horizontal direction. I do. When the fixing arm 2b is fixed to the fixing bracket 8 with the bolt 11, the loose V-belt 3 without tension is moved in the direction in which the position of the driven pulley A1 is separated from the crankshaft pulley CP. Pulled by

Thereafter, the bolts 6 for attaching the mounting bracket 2 to the support bracket 1 are tightened and fixed at predetermined positions. Thus, by attaching the alternator A, the V belt 3 can be held at a predetermined position. In this state, the alternator A is swung to the right or left with the long bolt 4 attaching the alternator A to the mounting bracket 2 as a swing center, as shown by the imaginary line in FIG. A predetermined tension can be applied to the V-belt 3. That is, in the state where the fixed arm portion 2b is fixed to the fixed bracket 8, the rotation in the horizontal direction is impossible, but the rotation in the vertical direction is possible until the long bolt 4 is tightened. .

In order to adjust the position of the alternator A with the long bolt 4 as the swing center, the alternator A approaches the crankshaft pulley CP if the tension is higher than a predetermined tension while the fixed arm 2b is fixed. By swinging to the side (left side in FIG. 4), the tension can be adjusted. That is, due to this swing, the driven pulley A1 moves toward the engine EG in the vertical direction, so that the tension can be slightly reduced. Conversely, when the V-belt 3 is extended due to aging or the like, the tension of the V-belt 3 decreases, so that the alternator A moves away from the crankshaft pulley CP, that is, in a direction away from the crankshaft pulley CP (rightward in FIG. 4). Rock it. Thereby, the driven pulley A
Since 1 moves obliquely upward, that is, from the inside to the outside of the V-belt 3, the tension can be increased in accordance with the moving distance. Then, after such fine adjustment of the position of the alternator A, if the long bolts 4 are completely tightened, the tension of the V belt 3 can be maintained at a predetermined tension.

As described above, by attaching the alternator A to the engine EG through the support bracket 1 and the mounting bracket 2, when the tension of the V-belt 3 is applied and adjusted, the alternator A is fixed to the outside of the engine EG. Therefore, the space required for mounting and adjusting the tension can be minimized. Also,
Since the alternator A is swingably mounted between the mounting bracket 2 and the alternator A, fine adjustment of the tension can be easily performed. Further, since the tension can be applied by pressing the driven pulley A1 on the V-belt 3, it is possible to prevent the winding angle of the V-belt 3 on the driven pulley A1 from being reduced due to the application of the tension. it can. As a result, it is possible to suppress the occurrence of such a problem that the V-belt 3 comes off the driven pulley A1, thereby improving the reliability.

The present invention is not limited to the embodiment described above. In addition, the configuration of each unit is not limited to the illustrated example, and various modifications can be made without departing from the spirit of the present invention.

[0019]

As described above, according to the present invention, the belt from the crankshaft pulley is hung on the drive end of the alternator with the rotation shaft of the alternator close to the crankshaft pulley, and the drive end The tension of the belt can be adjusted by rotating and positioning the belt in a direction away from the crankshaft pulley. In addition, since the drive end of the rotating shaft selectively approaches and separates from the crankshaft pulley, the distance that the alternator itself separates from the engine can be minimized, and the space required for mounting can be reduced. .

[Brief description of the drawings]

FIG. 1 is a perspective view showing one embodiment of the present invention.

FIG. 2 is a plan view of the embodiment.

FIG. 3 is a side view showing a main part of the embodiment.

FIG. 4 is a front view of the embodiment.

[Explanation of symbols]

 A: Alternator A0: Rotating shaft A1: Driven pulley CP: Crankshaft pulley CS: Crankshaft S: Rotating shaft

Claims (1)

[Claims] 1. An alternator mounting structure for mounting an alternator on an engine so as to be position-adjustable so as to be driven via a belt on a crankshaft pulley mounted on a crankshaft, wherein the alternator has a shaft intersecting a rotation axis thereof. An alternator mounting structure characterized in that a drive end of a rotating shaft is supported by an engine so as to be rotatable in a direction approaching and separating from a crankshaft pulley.