JP4187741B2 - Chain case mounting structure - Google Patents

Description

  The present invention relates to a mounting structure for attaching a case member to a device main body.

  In an overhead cam internal combustion engine or the like, a timing chain for transmitting engine power to a valve train is provided on a side portion of the engine body, and the timing chain covers a chain case that is a case member.

  The chain case accommodates the timing chain in the internal space by fastening the outer peripheral portion to the engine body.

  For example, Japanese Patent Laid-Open No. 7-83069 discloses an example of a chain case of a V-type internal combustion engine, and a surface view of the chain case 01 attached to the side of an engine body such as a cylinder block and a cylinder head is shown. As shown in FIG.

  As shown in FIG. 9, the chain case 01 is provided with bolt holes 02 at substantially equal intervals on the outer peripheral portion, and is fastened and fixed to the engine body by bolts.

  Further, a plurality of fastening boss portions 03 are also formed in the central portion of the chain case 01 by drilling bolt holes 04 at required locations.

  Since the chain case 01 is bolted to the engine body at a plurality of fastening boss portions 03 as well as the outer peripheral portion, the center portion of the chain case 01 is integrally coupled to the engine body to improve rigidity. ing.

  However, since the fastening boss portion 03 is locally fastened to the engine body locally at the center portion of the chain case 01, in order to increase the rigidity of the entire center portion, a large number of fastening boss portions 03 are formed to It is necessary to connect to the engine body at several places.

  Therefore, the chain case has a complicated shape, and there are a large number of fastening means such as bolts, which makes installation work troublesome.

The present invention has been made in view mow斯, treatment is of the chain case can be suppressed easily mounted can and vibration to improve the rigidity of the central portion of the chain case with a small fastening means attached to the object The point is to provide the structure.

Means and effects for solving the problems

In order to achieve the above object, the invention according to claim 1 is characterized in that a plurality of said inner wall surfaces of a chain case in which an outer peripheral portion is fastened to an internal combustion engine body and a central fastening portion are fastened by a plurality of fastening means. A connecting wall for connecting the central fastening portions to each other is formed in an annular shape, the connecting wall is abutted against the internal combustion engine main body together with the central fastening portion, and the chain case is attached to the internal combustion engine main body. A through-hole is formed inside the annular connecting wall of the chain case, and a variable valve timing solenoid is attached to the internal combustion engine body using the through-hole to connect the internal combustion engine body side to the chain case. A liquid sealant is interposed on the abutting contact surface with the wall, and the fitting hole on the internal combustion engine main body side is exposed in the through hole of the chain case. The solenoid valve for solenoid valve is fitted into the fitting hole, the solenoid for variable valve timing is arranged in the through hole, and the bolt penetrates the bracket protruding to the side of the solenoid for variable valve timing. The chain case mounting structure is characterized in that the variable valve timing solenoid is fixedly screwed into a screw hole on the side.

This is applied to the chain case of an internal combustion engine. Even if vibration generated from the internal combustion engine is transmitted to the chain case, the central part of the chain case is firmly integrated with the internal wall of the internal combustion engine by the connecting wall of the inner wall surface of the chain case. It can be combined to increase rigidity and reduce the vibration of the center part of the chain case, prevent the generation of noise, and simplify the shape of the chain case without the need for many center fastening parts on the chain case. The fastening means can be reduced and the assembling work is facilitated.
Further, the coupling force is increased by interposing a liquid sealant on the contact surface between the internal combustion engine main body side and the connecting wall of the chain case.
The solenoid for variable valve timing can be attached and detached without removing the chain case using the through hole of the chain case, and the maintenance inspection and replacement work is easy.

  Hereinafter, an embodiment according to the present invention will be described with reference to FIGS.

  The present embodiment is applied to an internal combustion engine. The internal combustion engine 1 is a DOHC (double overhead camshaft) type in-line four-cylinder four-stroke cycle internal combustion engine mounted on an automobile, and is installed horizontally in a vehicle. (Crankshaft 6 is oriented in the left-right direction).

  The main body of the internal combustion engine 1 includes a cylinder block 2, a cylinder head 3 disposed above the cylinder block 2, and a crankcase 4 disposed below the cylinder block 2. The cylinder head 3 and the crankcase 4 are integrally connected to each other by a nut screwed to a bolt or stud bolt (not shown), and the right side surface of the cylinder block 2, the cylinder head 3, and the crankcase 4 (shown in FIG. 3). The chain case 5 that is an internal combustion engine case member is detachably and integrally attached to the surface).

  Accessories such as a hydraulic pump 61, an AC generator 62, a compressor 63, and a water pump 64 are attached to the right side of the front face of the internal combustion engine 1 via an accessory bracket 60, and a drive pulley 6a fitted to the crankshaft 6 and an idler. An endless belt 66 is stretched between the pulley 65, the driven pulley 61a of the hydraulic pump 61, the driven pulley 62a of the AC generator 62, the driven pulley 64a of the water pump 64, and the driven pulley 63a of the compressor 63. It has come to be.

  A crankshaft 6 is rotatably supported on a mating surface between the cylinder block 2 and the crankcase 4 of the internal combustion engine body, and a piston (not shown) is slidable on a cylinder (not shown) formed on the cylinder head 3. The piston and the crankshaft 6 are connected to each other via a connecting rod (not shown), and the piston is reciprocated by the combustion gas generated in the combustion chamber of the cylinder. The shaft 6 is driven to rotate.

  The cylinder head 3 is formed with an intake / exhaust port (not shown) that communicates with the top of the cylinder of the cylinder block 2, and is provided with an intake / exhaust valve (not shown) that communicates or blocks the intake / exhaust port. An intake / exhaust camshaft 7 integral with an intake / exhaust cam that opens and closes a valve is rotatably supported by the cylinder head 3, and a cam chain driven sprocket 8 is integrally fitted to the intake / exhaust camshaft 7. An endless cam chain 10 is suspended between a cam chain drive sprocket 9 integrated with the shaft 6 and the cam chain driven sprocket 8.

  A chain guide 11 is provided on one side (right side in FIG. 3) of the cam chain 10 and a chain tensioner 12 is provided on the other side of the cam chain 10. The chain tensioner 12 is pivoted at the upper end of the cylinder head 3. The chain guide member 13 is attached to the cam block 10 so that the lower part of the chain guide member 13 is pressed against the cam chain 10 to apply tension to the cam chain 10. The intake / exhaust camshaft 7 is smoothly rotated at a rate of one rotation corresponding to two rotations of the crankshaft 6 in a state where the chain 10 is tensioned without being loosened.

  Furthermore, a lubricating oil pump 15 is integrally attached to the lower surface of the cylinder block 2 and is endlessly connected to a pump drive sprocket 16 integrated with the crankshaft 6 and a pump driven sprocket 18 integrated with the lubricating oil pump 15 and the pump rotating shaft 17. A chain guide 20 is provided, a chain guide 20 is provided on one side (left side in FIG. 3) of the chain 19, and a chain tensioner 21 is provided on the other side of the chain 19. Tension is applied to the chain 19 by the elastic restoring force of the main body itself.

  The upper part of the cylinder block 2 is covered and sealed with a cylinder head cover 22, and the lower part of the cylinder block 2 is covered with an oil pan 23, and lubricating oil in the internal combustion engine 1 is stored in the oil pan 23. It is like that.

  As shown in FIGS. 6 to 8, the end surface of the main body of the internal combustion engine 1 including the cylinder block 2, the cylinder head 3 and the crankcase 4 as shown in FIG. An opening 34 through which the crankshaft 6 can pass is formed, and an opening 35 for checking and replacing the variable valve timing solenoid 50 of the valve operating system is formed at the upper part of the chain case 5. A maintenance opening 36 is formed at a location corresponding to the lifter 14 of the chain tensioner 12.

  As shown in FIG. 3, side edge walls 25 are formed so as to protrude forward and backward along the outline of the chain case 5 on the side surface to which the chain case 5 of the cylinder block 2, the cylinder head 3 and the crankcase 4 is attached. The end surface of the same side edge wall 25 is a mating surface with the chain case 5 on the same plane.

  Boss portions 26a having screw holes 26 are formed on the side edge wall 25 at substantially equal intervals.

  Boss portions 27a and 28a having screw holes 27 and 28 are formed above and below the portion corresponding to the opening 35 of the chain case 5 at the center of the side surface to which the chain case 5 of the cylinder head 3 is attached, The upper and lower boss portions 27a and 28a are connected to each other, and a protrusion 29 is formed in an annular shape (see FIG. 3).

  As shown in FIG. 5, the end surfaces of the boss portions 27 a and 28 a and the annular ridge 29 are in the same plane as the end surface of the side edge wall 25.

  A fitting hole 30 into which the linear valve of the variable valve timing solenoid 50 is fitted is formed inside the annular ridge 29, and a part of the ridge 29 extends inward to the extended portion. A screw hole 31 is provided (see FIG. 3).

  A screw hole 26p in front of the screw hole 28 at the lower end of the ridge 29 (right side in FIG. 3) is an oil filter 51 (hydraulic oil filter for variable valve timing) protruding forward from the front wall of the cylinder head 3. It is formed in the mounting portion 25a.

  Since the chain case 5 and the engine mount bracket 52 are fastened to the mounting portion 25a of the oil filter 51, the fastening rigidity of the chain case 5 and the engine mount bracket 52 is improved.

  On the other hand, as shown in FIGS. 6 to 8, the chain case 5 is formed with front and rear side edges 37 corresponding to the front and rear side edge walls 25 on the engine body side, and is attached to the front and rear side edges 37 at substantially equal intervals. A boss portion 38a having a hole 38 is formed corresponding to the boss portion 26a of the screw hole 31 on the engine body side.

  Boss portions 39a and 40a having attachment holes 39 and 40 are formed above and below the opening 35 at the upper center of the chain case 5, respectively, and a connecting wall 41 for connecting both the upper and lower boss portions 39a and 40a is formed in the opening 35. A protrusion is formed on the peripheral edge toward the inner wall surface 33 side.

  The end surfaces of the boss portions 39a and 40a and the annular connecting wall 41 are flush with the end surfaces of the front and rear side edge portions 37, and correspond to the boss portions 27a and 28a and the annular ridge 29 on the engine body side, as mating surfaces. It is abutted (see FIG. 5).

  The peripheral walls 42 and 43 are also formed at the peripheral portions of the openings 34 and 36 of the chain case 5, and the boss 38a, the connecting wall 41, and the peripheral walls 42 and 43 are connected to the inner wall surface 33 as shown in FIG. Thus, a plurality of inner ribs 44 are formed, and a curved rib 45 along the chain guide member 13 of the chain tensioner 12 is formed.

  Referring to FIG. 6, the boss portion 40a of the mounting hole 40 and the boss portion of the mounting hole 38p on the front (right side in FIG. 6) 38p (corresponding to the screw hole 26p on the cylinder head 3 side) are provided on the outer wall surface of the chain case 5. An outer rib 46 is connected to 38a.

  The chain case 5 as described above is put on the side of the engine body of the cylinder block 2, the cylinder head 3 and the crankcase 4 shown in FIG. The chain case 5 is detachably attached to the cylinder block 2, the cylinder head 3, and the crankcase 4, which are the main body of the internal combustion engine 1, by fastening bolts 47 that are screwed into the holes 26.

  It should be noted that FIPG or the like, which is a room temperature curing type silicon-based liquid sealant, is interposed on the contact surface between the engine main body side and the connecting wall 41 of the chain case 5 so as to increase the coupling force by fastening with bolts 47.

  FIG. 2 shows a state where the chain case 5 is attached to the main body of the internal combustion engine 1 and the drive pulley 6a is fitted to the crankshaft 6.

  6 and 7, three mounting holes 40, 38p, and 38q of the mounting holes 40 and 38p at both ends of the outer rib 46 of the chain case 5 and the adjacent mounting holes 38q below the mounting hole 38p are provided. The engine mount bracket 52 is fixed by the bolt 48.

  The bolts 48 pass through the mounting holes of the engine mount bracket 52 and the mounting holes 40, 38p, 38q of the chain case 5, and the screw holes 28, 26p, 26q of the cylinder head 3 and the cylinder block 2 (the cylinders corresponding to the mounting holes 38q). The chain case 5 and the engine mount bracket 52 are fastened to the cylinder head 3 and the cylinder block 2 as shown in FIG.

  A fitting hole 30 of the cylinder head 3 is exposed in the opening 35 surrounded by the annular connecting wall 41 of the chain case 5, and the linear valve 50 a of the variable valve timing solenoid 50 is fitted into the fitting hole 30. Then, the variable valve timing solenoid 50 is disposed in the opening 35, and a bolt 49 passes through the bracket protruding to the side of the variable valve timing solenoid 50 and is screwed into the screw hole 31 of the cylinder head 5 to be variable. The valve timing solenoid 50 is fixed (see FIGS. 4 and 5).

  FIG. 1 shows a state in which the engine mount bracket 52 and the variable valve timing solenoid 50 are thus attached.

  The variable valve timing solenoid 50 can be attached / detached without removing the chain case 5 using the opening 35 of the chain case 5 and can be easily inspected and replaced.

  As described above, in the chain case 5, the front and rear side edge walls 37 are fastened to the main body of the internal combustion engine 1 by the bolts 47, and the central mounting bosses 39 a and 40 a together with the annular connecting wall 41 are formed on the cylinder head 3. The bosses 27a and 28a are abutted against the annular ridge 29 and fastened to the cylinder head 3 with bolts 47 and 48.

  Therefore, the chain case 5 itself forms an annular connecting wall 41 at the center portion and has high rigidity and strength. In addition, the center portion of the chain case 5 is firmly attached to the main body of the internal combustion engine 1 with a wide area by the connecting wall 41. By being firmly bonded together, the rigidity is greatly improved and the vibration of the central portion can be effectively suppressed.

  For this reason, even if a large vibration occurs in the cam block 10 that is sent between the cylinder block 2, the cylinder head 3, the crankcase 4, and the chain case 5, the chain case 5 does not undergo large elastic deformation, and noise is generated. Is less likely to occur.

  Since the connecting wall 41 connecting the mounting boss portions 39a, 40a at the center of the chain case 5 is abutted against the main body of the internal combustion engine 1, it is not necessary to provide many mounting boss portions, and the shape of the chain case 5 is simplified. There are few fastening means such as bolts, and the assembly work becomes easy.

  The inner side of the ring-shaped connecting wall 41 of the chain case 5 is an opening 35, so that the weight of the chain case 5 and the internal combustion engine 1 can be reduced, and the variable valve timing solenoid 50 can be connected to the cylinder head 3 by using the opening 35. Since it is attached, the space can be used effectively.

1 is an overall side view of an internal combustion engine provided with a case member mounting structure according to an embodiment of the present invention. FIG. 2 is a side view of the internal combustion engine with some members removed. It is a side view of the internal combustion engine with a chain case removed. It is sectional drawing cut | disconnected along the IV-IV line | wire in FIG. It is sectional drawing cut | disconnected along the VV line | wire in FIG. It is a surface view of a chain case. FIG. It is sectional drawing cut | disconnected along the VIII-VIII line in FIG. It is a surface view of the conventional case member.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Internal combustion engine, 2 ... Cylinder block, 3 ... Cylinder head, 4 ... Crank case, 5 ... Chain case, 6 ... Crankshaft, 7 ... Intake / exhaust camshaft, 8 ... Cam chain driven sprocket, 9 ... Cam chain drive sprocket , 10 ... Cam chain, 11 ... Chain guide, 12 ... Chain tensioner, 13 ... Chain guide member, 14 ... Lifter, 15 ... Lubricating oil pump, 16 ... Pump drive sprocket, 17 ... Pump rotating shaft, 18 ... Pump driven sprocket, 19 ... Chain, 20 ... Chain guide, 21 ... Chain tensioner, 22 ... Cylinder head cover, 23 ... Oil pan,
25 ... side edge wall, 26 ... screw hole, 27, 28 ... screw hole, 29 ... protrusion, 30 ... fitting hole, 31 ... screw hole,
33 ... Inner wall surface, 34 ... Opening portion, 35 ... Opening portion, 36 ... Maintenance opening portion, 37 ... Side edge wall, 38 ... Mounting hole, 39,40 ... Mounting hole, 41 ... Connecting wall, 42,43 ... Perimeter wall 44 ... Inner rib, 45 ... Curved rib, 46 ... Outer rib, 47, 48, 49 ... Bolt,
50 ... Solenoid for variable valve timing, 51 ... Oil filter, 52 ... Engine mount bracket,
60 ... accessory bracket, 61 ... hydraulic pump, 62 ... AC generator, 63 ... compressor, 64 ... water pump, 65 ... idler pulley, 66 ... endless belt.

Claims (1)

On the inner wall surface of the chain case where the outer peripheral portion is fastened to the internal combustion engine body by the plurality of fastening means and the central fastening portion is fastened, a connection wall that connects the plurality of central fastening portions to each other is formed to project annularly,
The connecting wall is abutted against the internal combustion engine body together with the central fastening portion, and the chain case is attached to the internal combustion engine body,
The connecting wall is formed in an annular shape,
A through hole is formed inside the annular connecting wall of the chain case, and a variable valve timing solenoid is attached to the internal combustion engine body using the through hole,
A liquid sealing agent is interposed between the contact surfaces of the internal combustion engine body and the connecting wall of the chain case,
A fitting hole on the internal combustion engine body side is exposed in the through hole of the chain case,
The linear valve of the variable valve timing solenoid is fitted into the fitting hole, and the variable valve timing solenoid is disposed in the through hole,
A chain case mounting characterized in that a bolt projects through a bracket projecting sideways of the variable valve timing solenoid and is screwed into a screw hole on the internal combustion engine main body side to fix the variable valve timing solenoid. Construction.

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