JPH0639063Y2 - Alternator support device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a supporting device for an alternator mounted on an engine of a vehicle.

[Conventional technology]

Generally, the alternator is mounted on the front side of the engine, and a belt is looped between the crank pulley and the alternator pulley to rotate the alternator. This alternator is conventionally shown in, for example, FIG.
59-183030), one end side of the bracket 2 directly attached to the alternator 1 is supported on the side surface of the cylinder block 3 and the alternator bracket 4 attached to the front side of the engine, and the other end side is provided with an adjuster 5
Since the position of the belt 6 is adjustable, the tension of the belt 6 is adjustable.

Since the alternator bracket 4 is subjected to the tension of the belt 6, the weight of the alternator 1, the vibration load while the vehicle is traveling, etc., it is usually required to have a considerable strength.
A fixing strength to the cylinder block 3 is required. Therefore, the alternator bracket 4 has three bolt holes for the cylinder block 3 as shown in FIG. 9, for example.
Supporting arms 8a, 8b are provided which are fixed by bolts inserted through 7a, 7b, 7c and support one end side of the alternator 1 via a rib structure.

[Problems to be solved by the invention]

In the conventional structure shown in FIG. 8, the alternator bracket 4 is attached to the upper side and the adjuster 5 is attached to the lower side in the mounting posture of the alternator 1. However, considering the great strength of the belt 6, the alternator bracket 4 is attached to the lower side. It is desirable to dispose the adjuster 5 on the upper side in order to adjust the belt tension because the support becomes stronger. However, the alternator bracket 4 has the structure shown in FIG. 9, and the mounting surface to the cylinder block occupies a certain area of the side surface of the cylinder block. When it is arranged on the lower side, there is often a positional interference with the oil pressure gauge normally provided at the position on the side surface of the cylinder block, and often it cannot be arranged on the lower side.

Further, the alternator bracket 4 as shown in FIG. 9 is usually made of casting, and the casting is usually performed by ribs 10a, 10b, 10 connecting the mounting bolt bosses 9a, 9b, 9c in a triangular shape.
It is performed in a posture in which the c part is horizontal. Therefore, during casting, impurities are likely to collect near the mounting bolt boss portions 9a, 9b, 9c, and sink marks are likely to occur around the mounting bolt boss portion due to the difference in cooling rate, which causes a decrease in strength.
In particular, the rib portions near the mounting bolt boss portions 9a and 9b are the weakest portions in terms of strength in use, and it is desirable to prevent the strength from decreasing at these portions.

In consideration of the above problems, the present invention prevents the occurrence of a decrease in strength due to casting defects in the vicinity of the mounting bolt boss, which is the most severe of the strength of the alternator bracket. The purpose is to be able to support the side.

[Means for solving problems]

An alternator supporting device of the present invention for this purpose is an alternator supporting device provided with a alternator bracket made of a cast product, which is attached to a side surface of a cylinder block and can support one end side of the alternator. Forming three mounting bolt bosses for mounting the alternator bracket on the side surface of the cylinder block, and forming three ribs for connecting the mounting bolt bosses to form a triangle, the alternator bracket Is attached to the cylinder block, and protrudes in a direction away from the side surface of the cylinder block between the first mounting bolt boss portion located at the top and the second mounting bolt boss portion located at the bottom. A support arm that supports the lower end of the alternator is provided. First the position of the part connecting the first attachment bolt boss portion and the second mounting bolt boss
Third mounting bolt boss portion and the second mounting bolt boss portion that are overlapped with the positions of the ribs and are connected to the first mounting bolt boss portion through a linearly extending third rib. The second rib connecting the and is curved in a direction away from the side surface of the cylinder block, and a riser is set in the vicinity of the second mounting bolt boss portion of the second rib.

[Action]

In such an alternator supporting device, when casting the alternator bracket with each rib portion in a horizontal posture, the first and second ribs curved in a direction away from the side surface of the cylinder block are bent upward. To take.
Here, since the impurities in the molten metal tend to increase toward the upper part, the impurities may be collected on the top side of the first rib and the second rib and may be collected near the second mounting bolt boss. To be prevented. Further, since the riser is provided in the vicinity of the second mounting bolt boss portion of the second rib, the occurrence of shrinkage cavities in the vicinity of the second mounting bolt boss portion, which becomes severe under load, is prevented.

In this way, the occurrence of casting defects due to impurities or sinkage of water in the vicinity of the second mounting bolt boss located at the bottom that is most affected by the load is prevented, and sufficient strength as an alternator bracket is secured. To be done.

Also, by curving the second rib away from the side surface of the cylinder block, interference with the oil pressure gauge provided on the side surface of the cylinder block can be avoided, and the alternator bracket can be attached to the cylinder block at the conventional mounting position. It is possible to lower than. Therefore, it becomes possible to support the lower end side where the alternator can be mounted, and by supporting the lower end side by the support arm portion, a desirable arrangement can be obtained from the viewpoint of receiving the belt tension and operating the belt tension adjusting adjuster. Is achieved.

〔Example〕

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

1 to 7 show an alternator supporting device according to an embodiment of the present invention. In FIG. 2 and FIG. 3, 11 indicates the entire engine, and 12 indicates the cylinder block. On the side surface of the cylinder block 12 and at the front of the engine, a support arm portion that supports the lower end side of the alternator 13 in the mounted posture via a bracket 14.
An alternator bracket 16 having 15 is mounted. An alternator pulley 17 is attached to the alternator 13, and a belt 19 is stretched from the crank pulley 18 to the pulley 17. The upper end side of the alternator 13 is supported by the adjuster 20, and the tension of the belt 19 can be adjusted by the adjuster 20. A chain line 21 in FIG. 2 indicates a position of a lever (not shown) for adjusting the asher star 20, and an arrow A indicates a direction in which the belt 19 is stretched. Reference numeral 22 in FIG. 3 denotes an oil pressure gauge provided on the side surface of the cylinder block 12.

The alternator bracket 16 is constructed as shown in FIGS. 1, 4 to 6. The alternator bracket 16 is attached to the side of the cylinder block with a bolt 23
It has three bolt holes 24a, 24b, 24c (shown in FIG. 3).

Around the bolt hole 24a, the first mounting bolt boss portion 25a
Are formed. A second mounting bolt boss portion 25b is formed around the bolt hole 24b. Around the bolt hole 24c, a third mounting bolt boss portion 25c is formed.

Three ribs 26 are provided between the mounting bolt bosses 25a, 25b, 25c.
a, 26b, and 26c are connected so as to form a triangle. Of these, the first mounting bolt boss portion 25a and the second mounting bolt boss portion 25b are connected by a first rib 26a. The second mounting bolt boss portion 25b and the third mounting bolt boss portion 25c are connected by a second rib 26b. The third mounting bolt boss portion 25c and the first
The mounting bolt bosses 25a are connected by a third rib 26c.

3 ribs 26a, 26b, 26c on the alternator bracket 16
A portion 27 surrounded by is formed in a space that penetrates.
The first rib 26a is arranged on the side surface of the cylinder block 12 and on the front end side of the engine 11 (the side on which the belt 19 is stretched). The third rib 26c is arranged so as to face the engine rear side from the first rib 26a in a substantially horizontal state. The second rib 26b is arranged so as to extend from the end of the first rib 26a toward the third mounting bolt boss portion 25c.

A support arm portion 15 that supports the lower end side of the alternator 13 is provided between the first attachment bolt boss portion 25a and the second attachment bolt boss portion 25b. Support arm part 15
Is composed of a pair of arms 15a and 15b and a base portion 15c. The arms 15a and 15b project in a direction away from the side surface of the cylinder block 12.

The root portions of the arms 15a and 15b are connected to the base portion 15c. One arm 15a is reinforced by a reinforcing rib 28b connected to the second rib 26b. One of the base portions 15c is connected to the second mounting bolt boss portion 25b via another reinforcing rib 28c. The other side of the base portion 15c is connected to the first mounting bolt boss portion 25a through a protrusion 28a having a large wall thickness.

The position of the first rib 26a overlaps the position of one arm 15a of the support arm portion 15. This allows
The first rib 26a is curved substantially away from the side surface of the cylinder block 12. The center portion of the second rib 26b is curved in a direction away from the side surface of the cylinder block 12. The third rib 26c is not curved and extends linearly.

The bending height of the second rib 26b from the side surface of the cylinder block is set to a height that does not interfere with at least the oil pressure gauge 22 when the alternator bracket 16 is mounted at a predetermined position.

In the vicinity of the second mounting bolt boss portion 25b of the second rib 26b, a riser 29 for casting the alternator bracket 16 is set.

The alternator 13 includes a bracket 14, support arm portions 15a, 1
It is supported via a through bolt 30 which is inserted through 5b. The through bolt 30 is inserted from the rear side of the engine toward the front side, and is fixed by a nut 31 from the front side of the engine. The through bolt 30 is configured as shown in FIG. 7, and the bolt head 32 has an L-shaped stopper by an appropriate means (for example, a caulking structure, a key groove structure, etc.) so as to be integrated with the bolt. The plate 33 is fixed. Since the L-shaped bent portion 33a of the stopper plate 33 easily contacts the lower surface of the support arm portion 15a when the bolt 30 is inserted into the support arm portion 15a, an appropriate flat surface portion is formed on the lower surface of the support arm portion 15a. 34 are formed.

Next, the operation of the above-mentioned alternator supporting device will be described.

When casting the alternator bracket 16, as shown in FIG. 5, each rib 26a, 26b, 26c is in a substantially water-based posture, and each arm 15a, 15b of the support arm portion 15 is in a posture in which it extends upward. Casting is performed. In this state, the first ribs 26a and the second ribs 26b are in a posture of bending upward, so that the impurities in the molten metal are not attached to the boss portions for the mounting bolts.
It does not collect on 25a, 25b, and 25c, but it collects on the curved top side of the first rib 26a and the second rib 26b which become higher in position.

From the result of the strength evaluation in consideration of the tension of the belt 19, the weight of the alternator 13, the vibration load, etc., the portion 35 shown in FIG.
36 is the weakest, but as described above, the mounting bolt boss 25
Since impurities do not collect in the vicinity of a and 25b, the strength of the parts 35 and 36 is prevented from being reduced. As for the part 36, the protrusion
Since 28a is provided, the cross-sectional rigidity of this portion is increased and sufficient strength is secured. Further, with respect to the portion 35, since the push gate 29 is set in the portion 35, sink of the molten metal is prevented and the occurrence of casting defects is prevented. Furthermore, this part 35
With regard to the above, the cross-sectional shape is made large by the riser 29, and sufficient cross-sectional rigidity is secured.

Further, since the second rib 26b is curved in the direction away from the side surface of the cylinder block, even if the alternator bracket 16 is lowered from the conventional mounting position, it does not interfere with the oil pressure gauge 22. Therefore, the support arm portion 15
With this, it is possible to support the lower end side of the alternator 13, and it is possible to take a desirable arrangement in terms of support strength.
Further, since the adjuster 20 is located on the upper side of the alternator 13, it becomes easy to adjust the belt tension. Further, since the space surrounded by the three ribs of the alternator bracket 16 is the space 27, the weight of the alternator 16 can be reduced and the good visibility of the oil pressure gauge 22 can be secured. Further, since the alternator bracket 16 can be arranged on the upper side of the oil pressure gauge 22, this portion becomes compact.

Further, in the front side of the engine, there is often no space for inserting the through bolt for the alternator due to space restrictions, but in this device, the through bolt 30 is inserted from the rear side of the engine, and the stopper plate 33 is provided in the support arm portion 15a. Since it has an anti-rotation effect by being locked to, it can be fixed in a predetermined manner only by tightening the nut 31 on the front side of the engine. In other words, the work of applying a spanner to stop the rotation is unnecessary. Therefore, the through bolt
Wearability of the 30 is secured and work is facilitated.

[Effect of device]

According to the alternator support device of the present invention, the following effects can be obtained.

(1) Since the position of the first rib is overlapped with the position of the support arm portion protruding in the direction away from the side surface of the cylinder block, the second rib is curved in the direction away from the side surface of the cylinder block. It is possible to reinforce the arm portion with the first rib and prevent impurities from collecting near the mounting bolt boss portion during casting. Further, since the sprue gate is set in the vicinity of the second mounting bolt boss portion of the second rib, it is possible to prevent the occurrence of sink marks near the mounting bolt boss portion during casting.

Therefore, it is possible to eliminate a casting defect in the vicinity of the second mounting bolt boss portion located at the lowermost position where the load becomes the most severe, and it is possible to increase the strength of the second mounting bolt boss portion.

(2) Since the support arm portion that supports the lower side of the alternator is provided between the first mounting bolt boss portion and the second mounting bolt boss portion, the alternator bracket has a so-called both-end support structure. be able to. Therefore,
The bending load acting on each mounting bolt boss portion can be reduced, which is advantageous in terms of load, and the alternator bracket can be downsized.

(3) By curving the second rib in the direction away from the side surface of the cylinder block, it is possible to avoid interference with the oil pressure gauge provided on the side surface of the cylinder block. It is possible to lower than the position. Therefore, it becomes possible to support the lower end side in the mounting posture of the alternator, and by supporting the lower end side by the support arm portion, a desirable arrangement can be obtained from the viewpoint of receiving belt tension and operating the belt tension adjusting adjuster. can get.

[Brief description of drawings]

1 is a plan view of an alternator bracket of an alternator supporting device according to an embodiment of the present invention, FIG. 2 is a front view of an entire engine to which the alternator bracket of FIG. 1 is attached, and FIG. 3 is FIG. 4 is a side view of the apparatus of FIG. 1, FIG. 5 is a side view of the apparatus of FIG. 1 seen from another angle, and FIG. 6 is a perspective view of the apparatus of FIG. FIG. 7 is a side view of a through bolt inserted into the alternator bracket of FIG. 1, FIG. 8 is a front view of a conventional alternator support device, and FIG. 9 is a perspective view of the alternator bracket of FIG. . 11 …… Engine 12 …… Cylinder block 13 …… Alternator 15 …… Support arm 16 …… Alternator bracket 22 …… Oil pressure gauge 25a …… For first mounting bolt Boss 25b …… For second mounting bolt Boss portion 25c ...... Third mounting bolt boss portion 26a ...... First rib 26b ...... Second rib 26c ...... Third rib 29 ...... Steel gate

Claims (1)

[Scope of utility model registration request] 1. An alternator supporting device comprising an alternator bracket, which is attached to a side surface of a cylinder block and is capable of supporting one end side of the alternator, the alternator bracket being attached to the alternator bracket. In the state in which three mounting bolt bosses for mounting are formed and three ribs connecting the mounting bolt bosses to form a triangle are formed, and the alternator bracket is mounted on the cylinder block. Of the first mounting bolt boss portion located at the top and the second mounting bolt boss portion located at the bottom of the cylinder block, projecting in a direction away from the side surface of the cylinder block and supporting the lower end side of the alternator. An arm portion is provided, and the position of the support arm portion is set to the first
Of the mounting bolt boss portion and the second mounting bolt boss portion are overlapped with the position of the first rib, and the first mounting bolt boss portion is linearly extended through the third rib. The second rib connecting the third attachment bolt boss portion and the second attachment bolt boss portion to be connected is curved in a direction away from the side surface of the cylinder block, and a second rib of the second rib is formed. A supporting device for an alternator, wherein a sprue gate is set in the vicinity of a boss portion for the mounting bolt.