JP2002115558A - Auto-tensioner and structure of mounting auxiliary equipment in internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an autotensioner and a structure of mounting auxiliary equipment in an internal combustion engine, with high rigidity of mounting and a small number of part items for mounting. SOLUTION: This internal combustion engine 1, adjacently arranging the auto-tensioner 12 and the auxiliary equipment 14, is characterized by mounting a housing 13 of the auto-tensioner 12 in an internal combustion engine main unit 2, 3, 4 and mounting the auxiliary equipment 14 through the housing 13 of this autotensioner 12 in the internal combustion engine main unit 2, 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic tensioner for an internal combustion engine having a small number of mounting parts and a high mounting rigidity.
The present invention relates to an accessory mounting structure.

[0002]

2. Description of the Related Art In a conventional internal combustion engine, maintenance, inspection, and maintenance of a transmission system of a valve train can be easily performed, and the weight of an auto-tensioner and auxiliary equipment is added to a chain case described later. In order to avoid burden on the cylinder, the transmission system is hermetically sealed and the chain block is detachably mounted on the cylinder block.Attachments such as auto tensioners, generators, and pumps are not attached to these chains. -And auxiliary equipment were installed.

In order to avoid interference with the protruding portion of the internal combustion engine main body, other auxiliary machines, and parts of the internal combustion engine such as a level gauge guide cylinder when installing these auxiliary machines, the internal tension engine main body is connected to the auto tensioner. -And the accessory was mounted on the internal combustion engine via a bracket with the accessory separated.

For this reason, the auto-tensioner and the auxiliary machine protrude outward from the main body of the internal combustion engine to increase the outer shape of the entire internal combustion engine, and the number of parts increases, so that an increase in weight and cost is inevitable. .

[0005]

SUMMARY OF THE INVENTION The present invention provides an auto-tensioner for an internal combustion engine which has solved the above-mentioned problems.
・ Regarding the improvement of the accessory mounting structure, the invention according to claim 1
In an internal combustion engine in which an auto tensioner and an auxiliary machine are arranged adjacent to each other, a housing of the auto tensioner is mounted on the main body of the internal combustion engine, and the auxiliary machine is mounted on the main body of the internal combustion engine via the housing of the auto tensioner. It is characterized by the following.

According to the first aspect of the present invention, the auto-tensioner housing having high strength and rigidity serves as a supporting member of the auxiliary machine, and the auxiliary machine is firmly fastened and supported. You.

Further, a bracket dedicated to the auxiliary machine, which is a support member for mounting the auxiliary machine on the internal combustion engine body, is not required, so that a large weight reduction and a reduction in the number of parts can be achieved, and the cost can be reduced.

Further, according to the present invention, not only the timing case but also the auto-tensioner housing is firmly mounted on the internal combustion engine body having high strength and rigidity, and is firmly supported. be able to.

According to the third aspect of the present invention, not only can the mounting rigidity of the timing case be enhanced, but also the timing case itself mounted in the internal combustion engine body can be enhanced. The rigidity can be greatly improved.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention shown in FIGS. 1 to 3 will be described below. Internal combustion engine 1
Is a DOHC (double overhead camshaft) V-type 8-cylinder four-stroke cycle internal combustion engine mounted on an automobile. The main body of the internal combustion engine 1 includes a cylinder block 2 and a V-shaped upper portion of the cylinder block 2. And a crankcase 4 disposed below the cylinder block 2. The cylinder block 2, the cylinder head 3 and the crankcase 4 are screwed to bolts or stud bolts (not shown). An oil pan 5 is integrally attached to the lower end of the crankcase 4 in a watertight manner.

A crank shaft 6 is rotatably supported on the mating surface of the cylinder block 2 and the crank case 4, and a piston (not shown) slides on a cylinder (not shown) formed in the cylinder head 3. The piston and the crankshaft 6 are freely fitted, and are connected via a connecting rod (not shown). As the piston is reciprocated by the combustion gas generated in the combustion chamber of the cylinder, Crankshaft 6
Are driven to rotate.

Further, on one end face (right end face in FIG. 2) of the cylinder block 2, the cylinder head 3, and the crankcase 4, the power of the internal combustion engine 1 is supplied from the crankshaft 6 to a valve operating device (not shown) of the internal combustion engine 1. A timing chain cover 7 for sealing a cam chain and a sprocket (not shown) for transmitting the cylinder is brought into contact with the cylinder, the cylinder block 3, the cylinder head 3 and the crankcase 4. The timing chain cover 7 is detachably and integrally attached to the block 2, the cylinder head 3, and the crankcase 4.

Further, an air-conditioning compressor 9 is integrally mounted on the crankcase 4 and the cylinder block 2 located at the lower right side of FIG. 1, and is located above and outside the cylinder block 2 and the cylinder head 3. A power steering oil pump 10 is integrally mounted, and a cooling water pump 11 is integrally mounted on the cylinder block 2 located at a V bank above the cylinder block 2.

Further, as will be described in detail later, which is located at the lower left portion of FIG. 1, an auto tensioner 12 is integrally mounted on the cylinder block 2, and the auto tensioner 12 is mounted on the cylinder block 2.
Auto tensioner 12 housing located below 12
An ACG 14, which is an AC generator, is integrally mounted on the crankcase 13 and the crankcase 4.

As shown in FIG. 3, one mounting portion 13a of the housing 13 of the auto tensioner 12 is in contact with one end surface of the cylinder block 2 and further outwardly of the outside of the timing chain cover 7. 7a, the bolt 15 is screwed into the cylinder block 2 through the outer portion 7a of the timing chain cover 7 and the mounting portion 13a of the housing 13 of the auto tensioner 12, and the outer portion 7a of the timing chain cover 7 is tightened. And auto tensioner
The mounting portion 13a of the housing 13 of the cylinder 12 is a cylinder block 2.
Has been co-signed.

Also, the housing of the auto tensioner 12 is provided.
The other mounting portion 13b of the thruster 13 is in contact with an end surface of a tensioner bracket 16 protruding laterally from the left side portion of the cylinder block 2, and, like the one mounting portion 13a of the housing 13 of the auto tensioner 12, has a housing 13b. The outer portion 7b of the timing chain cover 11 is superposed on the outer side of the other mounting portion 13b of the cylinder block 2, and passes through the outer portion 7a of the timing chain cover 7 and the mounting portion 13b of the housing 13 of the auto tensioner 12. The bolt 17 is screwed and tightened to the tensioner bracket 16, and the outer portion 7 b of the timing chain cover 7 and the mounting portion 13 b of the housing 13 of the auto tensioner 12 are fastened together with the tensioner bracket 16 of the cylinder block 2.

Further, one bracket 18 of the ACG 14 is applied to the ACG support portion 13c of the housing 13 of the auto tensioner 12, and the ACG support portion 13c of the housing 13 of the auto tensioner 12 penetrates through the bracket 18.
The bolt 19 is screwed and tightened.

Further, the other bracket 20 of the ACG 14
Is applied to the bracket 21 of the crankcase 4 and penetrates through the bracket 20 so that the bracket 21 of the crankcase 4
A bolt 22 is screwed to 21.

One end of the crankshaft 6 penetrates through the timing chain cover 7 and protrudes outward. A driven pulley 23 is integrally fitted to one end of the crankshaft 6, and the air-conditioning compressor 9 and the power steering Oil pump 10, cooling water pump 11 and A
Driven pulleys 24, 25, 26, 27 are integrally fitted to the rotating shaft of the CG 14, respectively.

Further, in FIG. 1, a left fastening shaft (not shown) and a right fastening shaft 29 (not shown) are provided at substantially the centers of the left and right V-shaped portions of the cylinder block 2 so as to project therefrom. A hole is provided in the cover 7 at a position corresponding to the fastening shaft and the fastening shaft 29, and a female screw portion of the fastening shaft on the left side in FIG.
Are screwed and tightened, and the inner side of a ball bearing (not shown) of the idler pulley 31 is fitted to the right tightening shaft 29, and the bolt 32 is screwed into the female screw of the tightening shaft 29 projecting from the inner. The screws are tight. On the inner surface of the timing chain cover 7, an outer portion of the timing chain cover 7 into which the mounting bolt 15 of the auto tensioner 12 is fitted from a boss portion 33 on the outer periphery of the hole fitted to the left fastening shaft. A reinforcing rib 34 is formed toward 7a.

Furthermore, the driven pulleys 23, 24,
An endless belt 35 is stretched over 25, 26, 27, and this endless belt
An endless belt 35 is stretched over the idler pulley 31 so that the idler pulley 31 contacts the outer peripheral surface of the idler pulley 31, and an idler pulley 37 pivotally attached to a movable arm 36 of the auto tensioner 12 is attached to the outer peripheral surface of the endless belt 35. An endless belt 35 is stretched over an idler pulley 37 so as to be in contact with the idler pulley 37. The endless belt 35 is driven with a required tension by an auto tensioner 12 that urges the movable arm 36 toward the center of the internal combustion engine 1. 23, 24, 25, 26, 27 and the outer peripheral surfaces of the idler pulleys 31, 37, and the power of the internal combustion engine 1 is supplied from the crankshaft 6 to the air conditioning compressor 9, power steering oil pump 10, cooling water pump 11 And ACG14.

Further, in FIG. 1, a crank sensor 38 is disposed below the right idler pulley 31 and adjacent to the driven pulley 23, and the rotation angle of the crankshaft 6 is detected by the crank sensor 38. It is supposed to be.

The embodiment shown in FIGS. 1 to 3 is constructed as described above, and the idler pulley 37 of the movable arm 36 is driven by the auto-tensioner 12 with a required force.
When the internal combustion engine 1 starts operating,
The power of the internal combustion engine 1 is supplied from the crankshaft 6 through the endless belt 35 and the driven pulleys 24, 25, 26, 27 of the air conditioning compressor 9, the power steering oil pump 10, the cooling water pump 11, and the ACG 14. It is reliably transmitted to the air conditioning compressor 9, the power steering oil pump 10, the cooling water pump 11, and the ACG 14.

The compressor 9 for air conditioning, the oil pump 10 for power steering, the water pump 11 for cooling
Since the ACG 14 and the ACG 14 are disposed outside the timing chain cover 7, only the driven pulley 23 and the idler pulley 31 are required for maintenance, inspection, and maintenance of the transmission mechanism of the valve train in the timing chain cover 7. By removing the bolt and the bolt 8, the timing chain cover 7 can be easily removed, and the required work can be performed very efficiently.

Further, the ACG 14 in which the other bracket 20 is screwed and fastened to the bracket 21 of the crankcase 4 with bolts 22 is provided with an auto tensioner 12 in which one bracket 18 is integrally mounted on the cylinder block 2.
Since the housing 13 of the auto tensioner 12 has high strength and rigidity, the ACG 14 can be firmly and stably supported by the main body of the internal combustion engine 1 with the ACG supporting portion 13c of the housing 13 being screwed and tightened with the bolt 19. .

Furthermore, the mounting of the upper portion of the ACG 14 to the main body of the internal combustion engine 1 does not require a special support component such as a bracket, and this support component is used as an auto tensioner.
Since the housing 13 of 12 was replaced, the number of parts was deleted,
Weight reduction and cost reduction can be achieved.

Moreover, since the reinforcing ribs 34 are formed on the inner surface of the timing chain cover 7 from the boss portion 33 fitted to the fastening shaft 28 toward the outer portion 7a of the timing chain cover 7, Are reinforced and stiffened to prevent the timing chain cover 7 from vibrating due to the exciting force of the internal combustion engine 1.

Further, since the crank sensor 38 is disposed below the idler pulley 31 on the right side (shown in FIG. 1) of the internal combustion engine 1 where the auto tensioner 12 is not disposed, The movable arm 36 of the auto tensioner 12 on the left side of the internal combustion engine 1
Swinging freely without interfering with the robot.

[Brief description of the drawings]

FIG. 1 is an end view of an internal combustion engine provided with an automatic tensioner and accessory mounting structure according to the present invention, as viewed from a crankshaft direction.

FIG. 2 is an endless belt that is not bridged over an idler pulley that is pivotally supported at the tip of the movable arm of the auto tensioner.
FIG. 2 is an enlarged end view of a main part in a state where the movable arm of the auto tensioner has pivoted counterclockwise from the position shown in FIG. 1.

FIG. 3 is a view taken along the line III-III of FIG. 1;

FIG. 4 is a partially longitudinal side view partially cut along the line IV-IV in FIG. 2;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Internal combustion engine, 2 ... Cylinder block, 3 ... Cylinder head, 4 ... Crankcase, 5 ... Oil pan, 6 ... Crankshaft, 7 ... Timing chain cover, 8 ... Bolt, 9 ... Air-conditioning compressor, 10 ... Power steering Oil pump, 11: Water pump for cooling, 12: Auto tensioner, 13: Housing, 14: ACG, 15 ...
Bolt, 16… Tensioner bracket, 17… Bolt, 18
... bracket, 19 ... bolt, 20 ... bracket, 21 ... bracket, 22 ... bolt, 23 ... driven pulley, 24 ... driven pulley, 25 ... driven pulley, 26 ... driven pulley,
27 ... Driven pulley, 29 ... Tightening shaft, 30 ... Nut, 31 ... Idler pulley, 32 ... Bolt, 33 ... Boss, 34 ... Reinforcement rib, 35 ... Endless belt, 36 ... Movable arm, 37 ... Idler pulley, 38 ... crank sensor.

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) F02F 7/00 F02F 7/00 NF term (reference) 3G016 AA02 AA06 AA10 AA19 BA24 CA06 CA35 CA58 FA27 FA38 FA39 GA01 GA04 3G024 AA38 BA05 BA29 DA01 DA03 DA08 DA17 DA19 DA22 EA01 FA01 FA13 GA26

Claims (3)

[Claims] 1. An internal combustion engine in which an auto tensioner and an auxiliary machine are arranged adjacent to each other, wherein a housing of the auto tensioner is mounted on an internal combustion engine main body, and the auxiliary machine is connected to the internal combustion engine through a housing of the auto tensioner. An auto-tensioner and accessory mounting structure for an internal combustion engine, which is mounted on a main body. 2. The auto-tensioner according to claim 1, wherein the housing and the timing case of the auto-tensioner are fastened together and mounted on the internal combustion engine body.
・ Auxiliary equipment mounting structure. 3. The automatic tensioner / auxiliary machine mounting structure according to claim 2, wherein a rib is provided on a line connecting the central tightening portion and the co-fastening portion of the timing case.