JP2001090548A - Attaching structure of auxiliary equipment to engine - Google Patents

Abstract

(57) [Problem] To improve the coupling rigidity of accessories even in a small engine, to reduce vibration noise, reduce weight, and reduce costs. A configuration includes a mounting bracket (24) provided integrally with a cylinder block (4) and a mounting bracket (25) provided integrally with an oil pan (7), and auxiliary equipment is mounted on both mounting brackets.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a structure for attaching an auxiliary device to an engine.

[0002]

2. Description of the Related Art Generally, when an auxiliary device such as an alternator or a compressor for an air conditioner is mounted on a cylinder block of an engine, it is fastened via a bracket. However, with a small engine, the accessories are relatively large, and it is difficult to attach the engine to a cylinder block as in a normal engine. When mounted via a bracket, there is a problem that vibration and noise are deteriorated due to a decrease in coupling rigidity, an increase in weight and an increase in cost are caused, and an external dimension of the engine is increased.

[0003] The present invention solves the above-mentioned conventional problems, and provides an engine capable of improving the coupling rigidity of accessories and reducing vibration noise, weight reduction and cost reduction even in a small engine. It is an object of the present invention to provide an auxiliary device mounting structure.

[0004]

In order to achieve the above object, according to the first aspect of the present invention, there is provided a mounting bracket provided integrally with a cylinder block and a mounting bracket provided integrally with an oil pan. 25. An auxiliary machine is mounted on both mounting brackets.
The invention described in claim 1 is characterized in that the auxiliary machine is the alternator 12, and the invention described in claim 3 is based on claim 1 or 2, wherein the auxiliary machine is located near the mounting bracket 25 on the oil pan 7 side. The oil pan 7 is fixed to the cylinder block 3 by bolts 32. The invention according to claim 4 is characterized in that the engine according to any one of claims 1 to 3,
An engine body 2 having a cylinder axis C inclined toward the exhaust system E, and one end connected to the cylinder head 4;
Intake pipe 9 whose other end is bent and connected to surge tank 10
Wherein the height of the intake pipe is substantially the same as the height of the engine body. Note that the numbers added to the above configuration are compared with the drawings to facilitate understanding of the present invention, and the configuration of the present invention is not limited by this.

[0005]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show an embodiment of a structure for attaching an auxiliary device to an engine according to the present invention. FIG. 1 is a side view of the engine, FIG. 2 is a front view seen from the X direction in FIG. 1, and FIG. FIG. 2 is a bottom view as viewed from a direction C in FIG. 1.

In FIG. 1, an engine 1 is an in-line three-cylinder fuel injection type four-cycle engine, and an engine body 2
The cylinder axis C is inclined toward the exhaust system E side. As shown in FIG. 2, the engine body 2 is connected to a cylinder block 3, a cylinder head 4 connected to an upper part of the cylinder block 3, a head cover 5 covering the cylinder head 4, and a lower part of the cylinder block 4. It comprises a crankcase 6 and an oil pan 7 connected to a lower part of the crankcase 6.

By employing the structure in which the engine main body 2 is inclined as described above, a space is created on the intake system I side of the engine main body 2, and in this space, an intake pipe 9, a surge tank 10, a cooling water pump 11, Alternator 12,
Auxiliary equipment such as a belt tensioner 13 is provided, while a drive shaft D is provided in a space on the exhaust system E side (however, in the case of front-wheel drive with the engine laterally mounted). The cooling water pump 11, the alternator 12, and the belt tensioner 13 are connected to a driving pulley 16 fixed to a crankshaft 15 by a belt 14. An air conditioner compressor 17 and a belt tensioner 19 are provided as optional accessories.
6. Reference numeral 21 denotes an actuator of the tumble control valve.

In FIG. 1, that is, when the engine is viewed in the direction of the crankshaft center, the intake pipe 9 has one end connected to the cylinder head 4 and extends obliquely upward from the intake port of the cylinder head 4. After being extended horizontally at substantially the same height as that of the engine body 2, the engine body 2 is bent in an arc shape so as not to protrude from the right end (ie, the right end of the oil pan 7) in the drawing, and is connected to the surge tank 10. A throttle body 22 and an intake intake pipe 23 are connected to the surge tank 10.

With the above configuration, the height H and the width W of the engine body 2 are substantially the same, and the width Wo of the oil pan 7 and the width Wi of the intake system I are substantially the same. Further, the crankshaft 15 is configured to be located substantially at the center of the entire width of the engine body 2.

Next, the mounting structure of the alternator 12 and the air conditioner compressor 17 according to the present invention will be described. A mounting bracket 24 extending in the width direction of the engine body 2 is formed integrally with the cylinder block 3. A pair of mounting brackets 25, 2 extending in the width direction of the engine body 2 are provided on the upper and lower surfaces of the oil pan 7.
6 are integrally formed. And the alternator 12
The bolt 2 is attached to the mounting bracket 24 on the cylinder block 3 side and the mounting bracket 25 on the oil pan 7 side.
7 and 29. The air conditioner compressor 17 is fastened to the mounting brackets 25 and 26 on the oil pan 7 side by bolts 30.

As shown in FIG. 3, a recess 7a is formed in the oil pan 7, and an oil filter 31 is provided in the recess 7a. The oil filter 31 is fixed to the oil pan 7 by bolts 32. As shown in FIG. 1, the bolt 32 plays a role of fixing the oil pan 7 to the crankcase 6 and the cylinder block 3 near the mounting bracket 25.

As described above, when the relatively large alternator 12 is mounted on the relatively small engine body 2, since the integral brackets 24 and 25 are provided on the cylinder block 3 and the oil pan 7 and mounted on both sides, the conventional As compared with the case where the bracket is attached via a separate bracket as described above, the coupling rigidity of the accessory can be improved.
In addition, the oil pan 7 can be fixed to the crankcase 6 and the cylinder block 3 by the bolts 32 using the high rigidity portion, so that the coupling rigidity as a whole can be improved.

Although the embodiment of the present invention has been described above, the present invention is not limited to this, and various modifications can be made. For example, in the above embodiment, the alternator is mounted across the cylinder block and the oil pan. However, the present invention is not limited to the alternator, and may be applied to auxiliary equipment such as an air conditioner compressor and a power steering oil pump. . Further, in the above embodiment, the present invention is applied to an engine of a type in which the engine body is inclined. However, the present invention is not limited to this. It is possible.

[0014]

As is apparent from the above description, according to the first to third aspects of the present invention, even in a small engine, the coupling rigidity of the accessories is improved, the vibration noise is reduced, the weight is reduced, and the cost is reduced. In addition, since the auxiliary machine can be mounted below the engine, that is, at a low position on the oil pan side, the position of the center of gravity of the engine can be lowered. Auxiliary equipment can be arranged in the space created by the above operation, and the engine can be made more compact.

According to the fourth aspect of the present invention,

[Brief description of the drawings]

FIG. 1 is a side view of an engine showing an embodiment of a structure for attaching an accessory to an engine according to the present invention.

FIG. 2 is a front view as viewed from an X direction in FIG. 1;

FIG. 3 is a bottom view as viewed from a direction C in FIG. 1;

[Explanation of symbols]

 2 ... Engine body 3 ... Cylinder block 4 ... Cylinder head 7 ... Oil pan 9 ... Intake pipe 10 ... Surge tank 24, 25 ... Mounting bracket 32 ... Bolt

Claims (4)

[Claims] 1. An auxiliary device for an engine, comprising: a mounting bracket provided integrally with a cylinder block; and a mounting bracket provided integrally with an oil pan, wherein auxiliary devices are mounted on both mounting brackets. Mounting structure. 2. The structure according to claim 1, wherein said auxiliary machine is an alternator. 3. The mounting structure according to claim 1, wherein the oil pan is fixed to the cylinder block by bolts near the mounting bracket on the oil pan side. 4. When the engine is viewed in the direction of the crankshaft center,
An engine body having a cylinder axis inclined toward the exhaust system, an intake pipe having one end connected to the cylinder head and the other end bent and connected to the surge tank, and having a height of the intake pipe. 4. The structure for mounting an accessory to an engine according to claim 1, wherein the height of the accessory is substantially the same as the height of the engine body.