JP2006112435A - Auxiliary device mounting structure of internal combustion engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To effectively increase the mounting rigidity of an auxiliary device and reduce the number of parts. <P>SOLUTION: A first auxiliary-mounting part 56 is formed on the side wall part 54 of an oil pan 22 at an extension position of first and second bearing cap parts 42a and 42b. A second auxiliary-mounting part 58 is formed at an extension position of a third bearing cap part 42c. A compressor 48 is fixed to the first auxiliary-mounting part 56, and an oil filter 50 is fitted to a second auxiliary-mounting part 58. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an auxiliary machine mounting structure for an internal combustion engine for mounting an auxiliary machine to an internal combustion engine including a cylinder block and an oil pan or a lower block integrally formed with a bearing cap portion that supports a crankshaft.

  For example, in an automobile engine (internal combustion engine), various auxiliary machines such as a compressor and an oil filter are attached to a cylinder block and an oil pan constituting the engine. At that time, it is necessary to securely attach the auxiliary machine in order to prevent the auxiliary machine itself from generating vibrations.

  Therefore, for example, an engine accessory mounting structure disclosed in Patent Document 1 is known. In this conventional technique, an oil pan end and a clutch housing are connected, and an accessory mounting bracket for mounting an engine accessory is fixed over the oil pan and the cylinder block.

No. 5-15545

  However, in the above prior art, the oil pan to which the accessory mounting bracket is attached and the side wall portion of the cylinder block are configured to be relatively thin. Therefore, a problem has been pointed out that the oil pan and the side wall portions of the cylinder block cannot secure sufficient rigidity to securely attach the auxiliary machine. In addition, since a dedicated accessory mounting bracket is used, there is a problem that the number of parts increases.

  An object of the present invention is to solve this type of problem, and to provide an auxiliary machine attachment structure for an internal combustion engine that can effectively improve the attachment rigidity of the auxiliary machine and reduce the number of parts. And

  In the auxiliary machine mounting structure for an internal combustion engine according to the present invention, an oil pan or a lower block integrally formed with a bearing cap portion that supports the crankshaft is formed on the outer surface of the side wall portion that is continuous with the bearing cap portion. Auxiliary attachments are provided on the extension. For this reason, the auxiliary machine attachment part is reinforced by the bearing cap part, and the attachment rigidity of the auxiliary machine is effectively improved. In addition, a dedicated accessory mounting bracket is not required, and the number of parts can be reduced.

  Moreover, the recessed part for accommodating an auxiliary machine is formed in the side wall part outer surface of an oil pan or a lower block. Accordingly, it is possible to easily reduce the size of the entire internal combustion engine, and the auxiliary machine does not protrude so far outward from the auxiliary machine mounting part, so that the mounting rigidity of the auxiliary machine is improved. In that case, since the reinforcement rib which connects between several auxiliary machine attachment parts is formed in a recessed part, the rigidity of the said recessed part itself is securable.

  Furthermore, the auxiliary machine attachment part is provided ranging over the two bearing cap parts adjacent to the axial direction of a crankshaft. As a result, the attachment rigidity of the accessory is further improved, and when the accessory is attached, the rigidity of each bearing cap portion itself is improved, and the support rigidity of the crankshaft is effectively improved.

  Furthermore, the auxiliary machine is an oil filter, and an oil passage communicating with the oil filter is formed on a joint surface between the cylinder block and the oil pan or the lower block. Therefore, it is possible to secure the oil filter mounting rigidity and simplify the oil passage configuration.

  In the auxiliary machine mounting structure for an internal combustion engine according to the present invention, the oil pan or the lower block integrated with the bearing cap part is located on the outer surface of the side wall part connected to the bearing cap part on the extension of the bearing cap part. Since the attachment portion is provided, the accessory attachment portion is effectively reinforced by the bearing cap portion. This effectively improves the attachment rigidity of the auxiliary machine, eliminates the need for a dedicated auxiliary machine attachment bracket, and reduces the number of parts.

  FIG. 1 schematically shows a hybrid vehicle V in which an auxiliary machine mounting structure for an internal combustion engine according to an embodiment of the present invention is employed.

  The hybrid vehicle V includes an internal combustion engine (internal combustion engine) E that generates driving force by burning gasoline as fuel, an assist motor generator M that can generate driving force by electric power, and that can regenerate electric power, A clutch mechanism C including a flywheel and a transmission T that switches the driving force and transmits the driving force to the driving shaft 10 are provided.

  The motor generator M is driven and controlled by a motor drive circuit 12, and the motor drive circuit 12 is connected to a first capacitor 13 and a second capacitor 15 that stores electric power via a downverter 14. The The first battery 13 is, for example, a capacitor that supplies / charges high-voltage power. The hybrid vehicle V has a management control circuit 16. The management control circuit 16 includes a motor control circuit 17 that controls the motor generator M via the motor drive circuit 12, and an engine control circuit 18 that controls the internal combustion engine E. And are connected.

  As shown in FIGS. 2 and 3, the internal combustion engine E has three cylinders and includes an oil pan 22, a cylinder block 24, a cylinder head 26, and a head cover 27, and a crankshaft between the oil pan 22 and the cylinder head 26. 28 is pivotally supported.

  The crankshaft 28 includes journal portions 30a to 30d, crank pins 32a to 32c, and counterweights 34a to 34f. Large ends of connecting rods 36a to 36c are connected to the crank pins 32a to 32c, and the small ends of the connecting rods 36a to 36c are slidably fitted to the cylinder bores 38a to 38c of the cylinder block 24. Pistons 40a-40c are connected.

  As shown in FIGS. 3 and 4, the oil pan 22 is integrally provided with first to third bearing cap portions 42 a to 42 c. The first to third bearing cap portions 42a to 42c are configured as wall portions extending in a direction (arrow B direction) orthogonal to the axis of the crankshaft 28 (arrow A direction). The journal portions 30a to 30c of the crankshaft 28 are provided on the upper surfaces of the first to third bearing cap portions 42a to 42c in cooperation with semicircular upper bearing portions 44a to 44c provided at the lower portion of the cylinder block 24. Semicircular lower bearings 46a to 46c that are rotatably supported are formed.

  The oil pan 22 is provided with an auxiliary equipment mounting structure 52 according to the present embodiment for mounting an air conditioner compressor 48 and an oil filter 50 as auxiliary equipment. As shown in FIG. 4, the outer surface of one side wall portion 54 connected to the first to third bearing cap portions 42a to 42c of the oil pan 22 is on the extension of the first and second bearing cap portions 42a and 42b. The first auxiliary machine attaching part 56 is provided at the position, and the second auxiliary machine attaching part 58 is provided on the extension of the third bearing cap part 42c.

  A concave portion 60 for accommodating the compressor 48 is formed on the outer surface of the side wall portion 54 so as to correspond to the first auxiliary machine attachment portion 56. The first auxiliary machine mounting portion 56 is provided on the extension of the first bearing cap portion 42a and on the extension of the first and second screw holes 62a and 62b provided on the extension of the first bearing cap portion 42a. Third and fourth screw holes 62c and 62d.

  Between the first screw hole 62a and the second screw hole 62b, between the second screw hole 62b and the third screw hole 62c, between the third screw hole 62c and the fourth screw hole 62d, and this Reinforcing ribs 64 are respectively formed between the fourth screw hole 62d and the first screw hole 62a, and the reinforcing rib 64 is connected by connecting the first screw hole 62a and the third screw hole 62c. 66 is formed.

  The compressor 48 is provided with bolt insertion cylindrical portions 68a to 68d corresponding to the first to fourth screw holes 62a to 62d, and the distal ends of the bolts 70 inserted into the cylindrical portions 68a to 68d are arranged in the first portion. -Screwed into the fourth screw holes 62a-62d. As shown in FIGS. 2 and 5, the compressor 48 is rotationally driven via a belt 74 attached to a pulley 72 attached to the crankshaft 28.

  As shown in FIGS. 4 and 6, the second accessory mounting portion 58 includes a screw hole 76 provided on an extension of the third bearing cap portion 42 c. An oil supply passage 78 is opened in the side wall portion 54 in the vicinity of the screw hole 76, and this oil supply passage 78 is used for supplying oil in the oil pan 22 to the oil filter 50 via an oil pump (not shown). It is a passage.

  As shown in FIG. 6, an oil supply passage 80 for supplying purified oil through the oil filter 50 is formed in the screw hole 76, and this oil supply passage 80 is formed between the cylinder block 24 and the oil pan 22. It communicates with a main gallery (oil passage) 82 provided on the joint surface. A receiving groove 83 for accommodating leaked oil communicates with the outer side end portion of the main gallery 82. A passage 84 formed between the cylinder block 24 and the oil pan 22 communicates with an inner side end portion of the main gallery 82, and oil is divided into the cylinder block system and the cylinder head system through the passage 84. The

  Specifically, the passage 84 extends in the axial direction of the crankshaft 28 and then supplies oil to the recesses 86 for supplying oil to the journal portions 30a to 30d of the crankshaft 28 and the pistons 40a to 40c. It communicates with a jet (not shown). The passage 84 is further connected to the cylinder head 26 via a passage 90 provided around a through bolt 88 for integrally connecting the cylinder head 26, the cylinder block 24, and the first to third bearing cap portions 42a to 42c. Communicate with the lubrication part on the side.

  As shown in FIG. 2, a motor generator M having a rotor connected directly to the crankshaft 28 is coupled to the output side of the internal combustion engine E, and a clutch mechanism C is formed on the rotor of the motor generator M. A disk-like flywheel (not shown) is fixed. A transmission T is mounted on the output side of the clutch mechanism C, and this transmission T uses MT in this embodiment, but may adopt AT.

  The operation of the accessory mounting structure 52 according to this embodiment configured as described above will be described below.

  First, in the hybrid vehicle V, when the internal combustion engine E is driven, the crankshaft 28 rotates, and the compressor 48 that engages the crankshaft 28 via the pulley 72 and the belt 74 is driven. On the other hand, under the action of an oil pump (not shown), the oil in the oil pan 22 is introduced into the oil filter 50 from the oil supply passage 78 and purified, and then introduced into the main gallery 82 from the oil supply passage 80.

  As shown in FIG. 6, the oil is supplied from the recess 86 to the first to third bearing cap portions 42a to 42c and the journal portions 30a to 30d through the passage 84, and is formed in the connecting rods 36a to 36c. Oil is ejected to the pistons 40a to 40c via a jet, an oil jet attached to the cylinder block 24, or the like. On the other hand, oil is supplied to the cylinder head 26 from a passage 90 formed around the through bolt 88, and this oil is supplied to various sliding portions and then returned to the oil pan 22.

  The rotation of the crankshaft 28 is transmitted to the drive shaft 10 via the motor generator M, the clutch mechanism C, and the transmission T. At that time, the motor generator M is driven, and an assist force for the drive force by the internal combustion engine E can be generated.

  In this case, in this embodiment, as shown in FIG. 2 and FIG. 4, the compressor 48 that is an engine accessory is attached to the first accessory attachment portion 56 provided on the outer surface of the side wall portion 54 of the oil pan 22 with a bolt 70. It is mounted directly through. In the first accessory mounting portion 56, first and second screw holes 62a and 62b into which the bolts 70 are screwed are provided on the extension of the first bearing cap portion 42a, and third and fourth screw holes are provided. 62c and 62d are provided on the extension of the second bearing cap portion 42b.

  Accordingly, the first accessory mounting portion 56 is sufficiently reinforced in the direction (arrow B direction) intersecting the axial direction of the crankshaft 28 by the first and second bearing cap portions 42a and 42b. The effect that the attachment rigidity of 48 improves significantly is acquired.

  Moreover, since the compressor 48 is directly attached to the side wall portion 54 of the oil pan 22 via the bolt 70, for example, a dedicated accessory mounting bracket is not required, and the number of parts can be reduced.

  Similarly, the second auxiliary machine attachment portion 58 is provided on the extension of the third bearing cap portion 42c with respect to the outer surface of the side wall portion 54 of the oil pan 22. For this reason, the oil filter 50 is firmly held via the third bearing cap portion 42c only by screwing the oil filter 50 into the screw hole 76 that constitutes the second auxiliary machine attachment portion 58. As a result, the rigidity of the second accessory mounting portion 58 is effectively improved, and the number of parts can be easily reduced.

  Furthermore, in this embodiment, the recessed part 60 is provided in the side wall part 54 corresponding to the site | part to which the compressor 48 is attached. For this reason, in a state where the compressor 48 is disposed in the recess 60, the compressor 48 does not protrude so much outwardly of the side wall portion 54 (see FIG. 5), and the compressor acting on the first auxiliary machine mounting portion 56 is used. The moment of 48 is reduced, and the rigidity of the first accessory mounting portion 56 is effectively improved. In that case, the ribs 60 and 66 for reinforcement are formed in the recessed part 60, There exists an advantage that the rigidity of this recessed part 60 itself can be ensured.

  Furthermore, in the first auxiliary machine mounting portion 56, the compressor 48 is mounted across the two first and second bearing cap portions 42a and 42b adjacent in the axial direction (arrow A direction) of the crankshaft 28. Yes. Accordingly, the mounting rigidity of the compressor 48 is further improved, and the rigidity of the first and second bearing cap portions 42a and 42b is improved by the compressor 48 itself, and the support rigidity of the crankshaft 28 is effectively improved. It is done.

  In the present embodiment, the first to third bearing cap portions 42a to 42c are formed integrally with the oil pan 22, but the present invention is not limited to this. For example, first to third bearing cap portions 42a to 42c are integrally provided in a lower block (not shown), and an oil pan is attached to the lower block, and an auxiliary machine mounting structure 52 is provided to the lower block. It may be adopted.

  Further, in the present embodiment, the auxiliary machine mounting structure 52 is provided in the internal combustion engine E incorporated in the hybrid vehicle V. However, it can be applied to a normal internal combustion engine vehicle.

1 is a schematic explanatory view of a hybrid vehicle to which an auxiliary machine mounting structure for an internal combustion engine according to an embodiment of the present invention is applied. It is an external appearance side view of the said auxiliary machinery attachment structure. It is a longitudinal cross-sectional explanatory drawing of the internal combustion engine to which the said auxiliary machinery attachment structure is applied. It is a disassembled perspective explanatory drawing of the said auxiliary machinery attachment structure. It is front explanatory drawing of the said internal combustion engine. It is the longitudinal cross-section front view which cut | disconnected the said internal combustion engine along the 2nd auxiliary machine attachment part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 22 ... Oil pan 24 ... Cylinder block 26 ... Cylinder head 28 ... Crankshaft 42a-42c ... Bearing cap part 48 ... Compressor 50 ... Oil filter 52 ... Auxiliary machine attachment structure 54 ... Side wall part 56, 58 ... Auxiliary machine installation part 60 ... Recesses 62a to 62d, 76 ... Screw holes 64, 66 ... Reinforcing ribs 70 ... Bolts

Claims (5)

An auxiliary machine attachment structure for an internal combustion engine for attaching an auxiliary machine to an internal combustion engine comprising a cylinder block and an oil pan or a lower block integrally formed with a bearing cap portion that supports a crankshaft,
An auxiliary machine mounting structure for an internal combustion engine, wherein the oil pan or the lower block includes an auxiliary machine mounting part positioned on an extension of the bearing cap part on an outer surface of a side wall part connected to the bearing cap part.   2. The auxiliary machine attachment structure according to claim 1, wherein a recess for accommodating the auxiliary machine is formed on an outer surface of a side wall of the oil pan or the lower block. .   3. The auxiliary machine attachment structure for an internal combustion engine according to claim 2, wherein a reinforcing rib for connecting the plurality of auxiliary machine attachment parts is formed in the recess.   The accessory mounting structure according to any one of claims 1 to 3, wherein the accessory mounting portion is provided across two bearing cap portions adjacent in the axial direction of the crankshaft. An auxiliary machine mounting structure for an internal combustion engine. 2. The auxiliary machine mounting structure according to claim 1, wherein the auxiliary machine is an oil filter,
An auxiliary machine mounting structure for an internal combustion engine, wherein an oil passage communicating with the oil filter is formed on a joint surface between the cylinder block and the oil pan or the lower block.

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