JPH10317985A - Mounting structure for engine auxiliary machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the supporting rigidity of a bracket for supporting an engine auxiliary machine and tightly mount a chain cover on the cylinder block and lower case of an engine. SOLUTION: A mounting structure for an engine auxiliary machine typically supports an air-conditioning compressor 13 near a cylinder block 2 and a lower case 3 both constituting an engine 1 with the use of a bracket 18. The compressor 13 is mounted so as to hang over both the cylinder block 2 and lower case 3. The bracket 18 is partly fixed to a boss 20 projecting sideward from a chain cover 17 that covers the front of both the cylinder block 2 and lower case 3. The bracket 18 is thus supported on not only the cylinder block 2 and lower case 3 but the cover 17, which constitution improves the supporting rigidity of the bracket 18 and also strengthens the contact of the cover 11 with the cylinder block 2 and the like to prevent lubricating oil leakage through their gaps.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting structure for engine accessories, which is applied to an automobile engine or the like.

[0002]

2. Description of the Related Art An engine of an automobile is provided with an auxiliary machine functioning to operate the engine and an auxiliary machine functioning by receiving a rotational force from a crankshaft of the engine. The latter includes an alternator and a compressor of an air conditioner. Each of these auxiliary devices has a structure in which a pulley is attached to a drive shaft, and a belt is wrapped around a crank pulley attached to a crankshaft to obtain power. Since the pulley is attached to the end of the drive shaft,
Unless the housing of the auxiliary machine is fixed firmly, the direction of the belt changes due to the tension of the belt, and as a result, the belt is loosened.

[0003] For this reason, various structures for firm attachment have been proposed. One of them is disclosed in Japanese Utility Model Laid-Open No. 63-48932. This is a bracket in which the accessory is mounted over the cylinder block and the oil pan, and the bracket is attached to the two members in this way to strengthen it, and the accessory is mounted on this to solve the purpose. Is what it is. As another technique, there is one disclosed in Japanese Utility Model Laid-Open No. 4-100037. In this method, a mount bracket for supporting the engine on the vehicle body and a bracket for supporting the auxiliary machine on the engine are fastened together, and the auxiliary machine is firmly attached.

Here, a conventional example different from the above prior art will be described with reference to the drawings. 6 and 7, 1 is an engine, 2 is its cylinder block, 3 is a lower case, 4 is a cylinder head, 5 is a cylinder head cover, and 6 is an oil pan. A crankshaft 7 is supported at a joint between the cylinder block 2 and the lower case 3, and a crank pulley 8 is attached to a front end thereof, and a flywheel 9 is attached to a rear end thereof.

[0005] As shown in FIG.
A part of the endless belt 10 is hung, and the belt 10 drives auxiliary machines such as an alternator 11, an oil pump 12 for power steering, and a compressor 13 for an air conditioner (hereinafter referred to as a compressor).
Reference numerals 14, 15, and 16 denote pulleys for driving these auxiliary machines,
Is a chain cover located at the back of these pulleys 14, 15, 16.

Focusing on the compressor 13 of the auxiliary equipment, the compressor 13 is supported by a bracket 18 projecting laterally from the cylinder block 2. The bracket 18 is supported on the cylinder block 2 and the lower case 3 by bolts 19.

In belt-driven accessories, belt tension is always applied to pulleys attached to the drive shaft. In the case of the compressor 13, the tension of the belt 10 always acts on the pulley 16 toward the crankshaft 7. Since this force is received by the bracket 18, it is necessary to increase the strength of the portion that supports the bracket 18, and therefore, it is necessary to sufficiently increase the rigidity of the cylinder block 2, the lower case 3, the bolt 19, and the like. , Weight reduction and cost.

Therefore, it has been considered that the bracket 18 is also supported by a chain cover (or belt cover) 17 that covers the front surfaces of the cylinder block 2 and the lower case 3. In this case, in a belt-type engine in which a pulley is attached to a crankshaft and a camshaft and a timing belt is stretched between the pulleys, a belt cover is often removed to check the degree of wear of the belt or to replace the belt when the belt is cut. Therefore, it was inappropriate to attach the bracket 18 here. On the other hand, in a structure in which the camshaft is driven by a timing chain, the chain cover 17 is used.
It is necessary to prevent the lubricating oil from leaking from the mounting portion of the chain cover due to the vibration transmitted through the bracket 18 although the frequency of removing the lubricating oil is small.

[0009]

The above two prior arts cannot solve the above-mentioned problem because of their different structures. The present invention has been made in view of this point, and aims to provide a structure that enhances the support rigidity of a bracket that supports an auxiliary machine and that also firmly attaches a chain cover to a cylinder block and a lower case. is there.

[0010]

According to the present invention, as a means for solving the above-mentioned problems, according to the first aspect of the present invention, an auxiliary device for an engine is disposed near a cylinder block and a lower case of the engine. In the mounting structure of the engine auxiliary device supported by the bracket, the auxiliary device is mounted so as to straddle the cylinder block and the lower case, and a boss protrudes laterally from a chain cover that covers the front surface of the cylinder block and the lower case. A part of the bracket is fixed to the boss.

According to the invention described in claim 2, in an engine accessory mounting structure in which an engine accessory is arranged near a cylinder block and a lower case of an engine and supported by a bracket, the accessory is mounted on a cylinder. A bracket is attached to the block and the lower case, and a boss protrudes forward from a chain cover that covers the front surface of the cylinder block and the lower case, and a part of the bracket is fixed to the boss.

According to the above structure, since the bracket is supported by the cylinder block, the lower case, and the chain cover, the auxiliary equipment can be firmly supported. Since the chain cover is connected to the cylinder block and the lower case through the bracket, lubricating oil does not leak from the mating surface of the chain cover with the cylinder block and the lower case.

In this case, in the structure in which a part of the bracket is supported by the side of the chain cover as in the first aspect of the present invention, the bolts for tightening the bracket are all in the same direction, so that the bracket is attached. Work becomes easier. In a structure in which the bracket is attached to the chain cover in front of the chain cover as in the second aspect of the present invention, the bracket covers the side of the chain cover. Installation becomes firm.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the present invention will be described with reference to FIG. 1 showing a main part thereof from the front of an engine 1 and a right view of the engine shown in FIG. 1 with a compressor 13 removed. 2 will be described. As shown in FIG. 1, the bracket 18 partially has a plurality of column-shaped upright portions 18b in a frame-shaped flat plate portion 18a viewed from the direction of FIG. The upright portion 18b is used to support the compressor 13, which is an auxiliary machine. The bracket 18 is attached to the cylinder block 2 or the like by a frame-shaped flat plate portion 18a.
Part.

A boss 20 is formed on the side of the chain cover 17 so as to project therefrom.
A portion of the flat plate portion 18a is fixed. That is, the flat plate portion 18a of the bracket 18 has a size extending from the side of the chain cover 17 to the side of the cylinder block 2 and the lower case 3. The boss 20 of the chain cover 17 is provided with a bolt 19A, and the cylinder block 2 is provided with a bolt. 19B,
Furthermore, it is fixed to the lower case 3 with bolts 19C.

The chain cover 17 of the bracket 18
The portion facing the boss 20 protrudes laterally, and a substantially triangular rib 21 is provided from the protruding portion 18c to a portion below the lower case 3 that supports the lower case 3. The projections 18c are reinforced by the ribs 21.

FIGS. 3 and 4 show another embodiment of the present invention. The bracket 18 in this case is
As shown in FIGS. 1 and 2, the cylinder block 2 and the lower case 3
As shown in FIG. 7, a part is bent toward the front side of the chain cover 17. The bending portion 18d is fixed to the overlapping portion (see FIG. 5) of the boss 22 projecting forward from the chain cover 17 and the boss 23 projecting forward from the cylinder block 2 with a bolt 19D. ing. With this structure, the chain cover 17 is attached to the cylinder block 2.
Is pressed against the lower case 3 side.

In this structure, a reinforcing rib 24 is provided from the flat plate portion 18a of the bracket 18 to the lower standing portion 18b.

In the embodiment described above, a compressor for an air conditioner is used as an accessory, and the compressor is supported so as to extend from a cylinder block to a lower case. However, the compressor as an accessory is merely an example. However, it goes without saying that the present invention is not limited to this, but can be applied to other auxiliary machines.

[0020]

According to the present invention, since the mounting structure of the engine accessory configured as described above is used, the bracket for supporting the accessory can be firmly supported, and further, the chain cover is provided by the bracket. In addition to increasing the coupling rigidity of the cylinder block and the lower case, oil leakage from the mating surface of the chain cover, the cylinder block and the lower case can be prevented.

In a structure in which a part of the bracket is fixed to the side of the chain cover, a plurality of bolts for fixing the bracket can be tightened from one direction, so that workability is good. In the case where the operation is performed from the front of the engine, the degree of close contact with the cylinder block and the lower case of the chain cover is increased.

[Brief description of the drawings]

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

FIG. 2 is a side view of a bracket portion in FIG. 1 as viewed from the right.

FIG. 3 is a front view showing a main part of another embodiment of the present invention.

FIG. 4 is a side view of the bracket part in FIG. 3 as viewed from the right.

FIG. 5 is a sectional view taken along line AA of FIG. 3;

FIG. 6 is a front view of an engine to which the present invention is applied.

FIG. 7 is a side view of FIG. 6 viewed from the right.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Engine 2 Cylinder block 3 Lower case 13 Compressor 17 Chain cover 18 Bracket 19A bolt 19B bolt 19C bolt 19D bolt 20 Boss 22 Boss

Claims (2)

[Claims] In an engine accessory mounting structure in which an engine accessory is disposed near a cylinder block and a lower case of an engine and supported by a bracket, the accessory is attached across the cylinder block and the lower case. And a boss protruding laterally from a chain cover that covers the front surface of the cylinder block and the lower case, and a part of the bracket is fixed to the boss. 2. An engine accessory mounting structure in which an engine accessory is disposed near a cylinder block and a lower case of an engine and supported by a bracket, wherein the accessory is attached across the cylinder block and the lower case. And a boss protruding forward from a chain cover that covers the front surface of the cylinder block and the lower case, and a part of the bracket is fixed to the boss.