JP2004066899A - Structure for supporting power unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a structure for supporting a power unit, which can increase the degree-of-freedom of positions for fixing seats of a mount having required stiffness, and in addition, can prevent deterioration of sealing performance at mating faces between a cylinder block and an oil pan, while preventing or suppressing the increase of the weight of an internal combustion engine. <P>SOLUTION: The power unit having the internal combustion engine, in which a lower block 20 composing the cylinder block and the oil pan 30 are connected at their mating faces 22a, 31a, is supported by a car body via a mount M3 attached to a mounting seat 70 formed on the internal combustion engine. The mounting seat 70 is divided into a block side part 70a integrally formed on a flange portion 22 forming the mating face 22a of the cylinder block 20 and a pan side part 70b integrally formed on the oil pan 30. The bracket 61 of the mount M3 is connected to the block side part 70a and the pan side part 70b so as to extend over them. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a structure for supporting a power unit provided with an internal combustion engine on a foundation structure by a mount, for example, a structure for supporting a power unit mounted on a vehicle on a vehicle body.
[0002]
[Prior art]
Conventionally, a power plant including an internal combustion engine is supported on a vehicle body by a plurality of mount members. At that time, the mounting seat of the mount member in the internal combustion engine including the cylinder block and the oil pan coupled to the cylinder block has been provided only in the cylinder block of the internal combustion engine. For example, in an engine support structure (hereinafter referred to as the former) mounted on an automobile disclosed in Japanese Patent Application Laid-Open No. 62-135648, a mounting portion (equivalent to a mounting seat) for mounting a mount is provided on a crankshaft. The boss is integrally provided on the cylinder block side wall near the boss of the bearing that supports the balance shaft that rotates synchronously. As described above, since the mounting portion is provided by using the boss portion which is a portion having high rigidity due to having a large thickness, the rigidity of the mounting portion can be increased without increasing the weight of the engine. it can.
[0003]
In general, there is also known a power unit supporting structure in which a pair of mounts located on the inertia main shaft are attached to both ends of the power unit in the direction of the inertia main shaft. In the case of this support structure (hereinafter, referred to as the latter), another mount is attached to the power unit in order to suppress vibration of the power unit around the inertia main axis due to a change in the rotation speed of the crankshaft.
[0004]
[Problems to be solved by the invention]
By the way, in the former, the bearing used for increasing the rigidity of the mounting portion is provided only at a specific position in the rotation axis direction of the crankshaft on the cylinder block side wall, so that it is integrated with the boss portion of the bearing. The degree of freedom in the mounting position of the mounting part becomes smaller, making it difficult to mount the mount at the optimum position from the viewpoint of vibration reduction, or dare to place the mount at the optimum position, the size of the mount increases. As a result, the weight may increase or the arrangement of the internal combustion engine with respect to the vehicle body may be restricted.
[0005]
Further, in the latter, when another mount is attached only to a cylinder block of an internal combustion engine including a cylinder block and an oil pan coupled to the cylinder block, the other mount is closer to the inertia main shaft than the oil pan. There is a disadvantage that the roll vibration cannot be effectively suppressed because it occupies the position. Therefore, it is conceivable to attach another mount to the oil pan, which is located farther from the inertia main shaft than the cylinder block, instead of the cylinder block. However, in general, since the rigidity of the wall of the oil pan is low, it is necessary to increase the rigidity in order to support the mount. Therefore, there is a problem that the weight of the internal combustion engine is increased. There is a possibility that the oil pan is deformed by the load, and the sealing performance at the mating surface of the oil pan and the cylinder block is reduced.
[0006]
The present invention has been made in view of such circumstances, and the inventions according to claims 1 to 4 form a mounting seat for a mount having a required rigidity while preventing or suppressing an increase in the weight of an internal combustion engine. It is an object of the present invention to provide a support structure for a power plant capable of increasing the degree of freedom of position and preventing a decrease in sealing performance at a mating surface of a cylinder block and an oil pan. The invention according to claim 2 further aims at effectively suppressing the roll vibration of the power unit mounted by the inertia spindle mounting method, and the invention according to claims 3 and 4 further reduces the size of the mounting seat. The fourth aspect of the present invention further aims to prevent deformation of the oil pan.
[0007]
Means for Solving the Problems and Effects of the Invention
According to the first aspect of the present invention, a power unit including an internal combustion engine provided with a crankshaft and a cylinder block and an oil pan joined at their mating surfaces is mounted on a mounting seat formed on the internal combustion engine. In the support structure for a power plant supported on a foundation structure via a mounted mount, the mounting seat is a block side portion integrally formed on a flange portion forming the mating surface of the cylinder block, and the oil pan And the mount is a support structure for the power unit that is connected to the block-side portion and the pan-side portion so as to be connected to the block-side portion and the pan-side portion.
[0008]
As a result, the block-side portion of the mounting seat is integrally formed with the flange portion, which is rigid in order to be coupled with the oil pan, in the cylinder block, while the pan-side portion formed on the oil pan is mounted on the mounting seat. , A weight increase for securing rigidity is suppressed. In addition, the flange portion of the cylinder block extends continuously in the direction of the axis of rotation of the crankshaft along the mating surface of the oil pan, so that the block side portion that utilizes the high rigidity of the flange portion, and thus the mounting seat The degree of freedom of the formation position of is increased. Further, by the mount connected across the cylinder block and the oil pan, the load acting on the mounting seat is dispersed to the cylinder block and the oil pan, and the load acting on the oil pan is reduced. Is restricted, so that the sealing performance on the mating surface does not decrease.
[0009]
As a result, according to the first aspect of the invention, the following effects can be obtained. That is, the mounting seat is divided into a block side portion integrally formed with the flange portion forming the mating surface of the cylinder block and a pan side portion integrally formed with the oil pan, and the mount is divided into the block side portion and the pan side. The rigidity of the block-side portion is increased with little increase in the weight of the cylinder block due to the rigidity of the flange portion, and the oil for securing the required rigidity of the pan-side portion is obtained by being connected to them over the portion. Since an increase in the weight of the pan is suppressed, the rigidity of the mounting seat is increased by using the rigidity of the flange portion of the cylinder block while increasing the weight of the internal combustion engine, thereby ensuring the required rigidity. In addition, since the block side portion may be integrally formed with the flange portion of the cylinder block extending over a wide range along the mating surface with the oil pan, the high rigidity of the portion whose rigidity has been increased in advance is used. The degree of freedom in the position where the mounting seat is formed is increased, and the mount can be mounted at an optimal position in the internal combustion engine from the viewpoints of vibration suppression and arrangement of the internal combustion engine in the substructure. Further, the load acting on the oil pan through the mounting seat is reduced, and the relative movement on the mating surfaces is restricted, so that the sealing performance on both mating surfaces is prevented from lowering.
[0010]
According to a second aspect of the present invention, a power plant including an internal combustion engine provided with a crankshaft and having a cylinder block and an oil pan joined at their mating surfaces supports the power plant by an inertia main shaft mounting method. First and second main mounts, and a submount attached to a mounting seat formed on the internal combustion engine to suppress roll vibration about a roll axis defined by the first and second main mounts. In a support structure of a power unit supported by a vehicle body, the mounting seat is a block side part integrally formed with a flange part forming the mating surface of the cylinder block, and a pan side integrally formed with the oil pan. And the sub-mount is connected to the block-side portion and the pan-side portion while being connected to them. It is a support structure of the location.
[0011]
Thus, in the support structure of the power unit in which the mount is a submount and the base structure is a vehicle body, the same operation as the invention of claim 1 is performed, and further, the power unit is connected to the first and second main units. The mounting seat formed from the flange of the cylinder block to the oil pan is more distant from the roll shaft than the case where the mounting seat is formed only on the cylinder block because the mount is supported by the inertia spindle mounting method. Therefore, roll vibration around the roll axis of the power unit is effectively suppressed.
[0012]
As a result, according to the second aspect of the present invention, the same effect as the first aspect of the invention can be obtained in a power unit supporting structure in which the mount is a submount and the base structure is a vehicle body. The following effects are achieved. That is, the power unit is further supported by the inertia main shaft mounting method by the first and second main mounts attached to the left and right ends, which are both ends in the rotation axis direction, to suppress roll vibration around the roll axis. Since the sub-mount is mounted on the mounting seat including the block-side portion and the pan-side portion, the roll vibration of the power unit is effectively suppressed, so that the vibration and noise of the vehicle body due to the roll vibration can be reduced. .
[0013]
According to a third aspect of the present invention, in the power unit supporting structure according to the first or second aspect, a bolt boss portion for a bolt connecting the cylinder block and the oil pan is formed on the flange portion. The block side portion is formed integrally with the bolt boss portion and the flange portion.
[0014]
Accordingly, the rigidity of the block side portion is further increased by the bolt boss portion, which is a portion having high rigidity.
As a result, according to the invention described in claim 3, in addition to the effects of the invention described in the cited claims, the following effects are exerted. That is, the flange portion is formed with a bolt boss portion through which a bolt for connecting the cylinder block and the oil pan passes, and the block side portion is formed integrally with the bolt boss portion and the flange portion, thereby increasing the rigidity of the block side portion. As a result, it is possible to reduce the size of the block side portion and, consequently, the mounting seat, and to further reduce the proportion of the rigidity of the mounting seat that the pan side portion covers, thereby further suppressing an increase in the weight of the oil pan for increasing the rigidity. It becomes possible.
[0015]
According to a fourth aspect of the present invention, in the support structure for a power unit according to any one of the first to third aspects, the pan-side portion is provided with a bolt for connecting the submount to the pan-side portion. The first mounting bolt boss portion and the second mounting bolt boss portion are formed of first and second mounting bolt boss portions, and the mating surface of the oil pan is formed by first reinforcing ribs formed integrally with the oil pan. And a first reinforcing bolt boss portion for closing a drain passage formed in the oil pan, wherein the first mounting bolt boss portion is connected to a second reinforcing rib integrally formed with the oil pan. Are formed integrally with the drain boss to be mounted.
[0016]
Accordingly, the rigidity of the pan-side portion formed by the first and second mounting bolt bosses is increased by the various reinforcing ribs, and the rigidity of the flange portion of the oil pan is also increased. In addition, the rigidity of the pan side portion is increased by utilizing the rigidity of the drain boss.
[0017]
As a result, according to the invention described in claim 4, in addition to the effects of the invention described in the cited claims, the following effects are exerted. That is, the pan-side portion includes first and second mounting bolt bosses for bolts that couple the submount to the pan-side portion, and the first mounting bolt boss and the second mounting bolt boss are respectively integrated with the oil pan. The rigidity of the pan-side portion is reduced by being connected to the flange portion forming the mating surface of the oil pan by the formed first reinforcing rib and being connected to each other by the second reinforcing rib formed integrally with the oil pan. In addition, the first mounting bolt boss is formed integrally with the drain boss to which the obstruction plug for closing the drain passage formed in the oil pan is mounted. Since the rigidity of the pan side part is further increased, the pan side part and, consequently, the mounting seat can be downsized, and furthermore, the oil pan is prevented from being deformed. It is.
[0018]
In this specification, the center plane means a plane including the rotation axis of the crankshaft, including the cylinder axis of the cylinder block, or being parallel to the cylinder axis. In addition, the inertia spindle mounting method refers to a mounting method in which a roll axis defined by a pair of main mounts coincides or substantially coincides with an inertia axis passing through the center of gravity of the power unit.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
Referring to FIG. 1, a power plant P to which the present invention is applied includes an internal combustion engine E provided with a crankshaft 40, and a transmission T integrally connected to the internal combustion engine E. The power plant P is mounted on a front portion of a vehicle body F of an FF type (front engine-front drive type) vehicle in a state where the internal combustion engine E is horizontally disposed so that the rotation axis of the crankshaft 40 is directed in the left-right direction. Be mounted.
[0020]
In this embodiment, "front and rear", "up and down" and "left and right" are based on the vehicle on which the power unit P is mounted, and correspond to the front and rear, up and down and left and right of the vehicle, respectively.
[0021]
The power plant P has a first main mount at a right end Pa (also a right end Ea of the internal combustion engine E) which is one end in a direction D1 of the rotation axis L2 (hereinafter, referred to as a rotation axis direction D1). M1 is elastically supported by the first upper side frame 1 of the vehicle body F, and is a second end at a left end Pb (also a left end of the transmission T) which is the other end in the rotation axis direction D1. The mount M2 is elastically supported by the second upper side frame 2 of the vehicle body F.
[0022]
The power unit P supported by the first and second main mounts M1 and M2 acts on the roll axis L1 defined by the two main mounts M1 and M2 by the action of roll torque generated by a change in the rotation speed of the crankshaft 40 and the like. Roll vibration around. Further, the first and second main mounts M1 and M2 correspond to the inertia main shafts in which the roll axis L1 passes through the center of gravity of the power unit P, in this embodiment, the inertia main axes pass through the respective centers of gravity of the internal combustion engine E and the transmission T. Or, they are arranged at both ends Pa and Pb of the power unit P in the rotation axis direction D1 so as to substantially coincide with each other. Therefore, the power unit P is supported on the vehicle body F, which is the basic structure, by the inertia spindle mounting method.
[0023]
Further, the power plant P includes one side of the internal combustion engine E in a direction D2 (hereinafter, referred to as an orthogonal direction D2) that includes a cylinder axis of a later-described cylinder of the internal combustion engine E and that is orthogonal to a center plane including the rotation axis L2. A pair of left and right side frame portions 3a and 3b of the U-shaped lower frame 3 of the vehicle body F are opened at the rear end portion, which is an end portion, by a submount M3 for suppressing roll vibration of the power unit P. The elastic member is elastically supported by the rear cross member 4 connected by the link. The sub-mount M3 suppresses the vibration of the vehicle body F and the generation of noise caused by the roll vibration of the power unit P.
[0024]
The internal combustion engine E will be further described with reference to FIGS. The internal combustion engine E, which is a DOHC type in-line four-cylinder internal combustion engine, includes an upper block 10 having four integrally formed cylinders, a lower block 20 connected to a lower end of the upper block 10, and a lower block 20 having a lower end. An oil pan 30 is provided, a cylinder head (not shown) connected to an upper end of the upper block 10, and a head cover (not shown) connected to an upper end of the cylinder head. The upper block 10, the lower block 20, the oil pan 30, and the cylinder head constituting the engine body are all made of an aluminum alloy.
[0025]
The upper block 10 and the lower block 20 pass through a flange portion 11 that forms a mating surface 11a of the upper block 10 with the lower block 20 and a flange portion 21 that forms a mating surface 21a of the lower block 20 with the upper block 10. The two mating surfaces 11a and 21a are joined together in a state where they are joined to each other by the large number of bolts B1.
[0026]
Similarly, the lower block 20 and the oil pan 30 are formed by a flange portion 22 that forms a mating surface 22a of the lower block 20 with the oil pan 30 and a flange portion that forms a mating surface 31a of the oil pan 30 with the lower block 20. The two mating surfaces 22a and 31a are joined together in a state where they are joined together by a number of bolts B2 passed through 31. For this purpose, the flange portion 22 is formed with a number of bolt bosses 23 projecting upward in the cylinder axis direction D3 and having screw holes 24 formed therein, and the flange portion 31 is provided at a position matching the screw holes 24. A large number of formed insertion holes 32 are formed, and each bolt B <b> 2 inserted into the insertion hole 32 is screwed into the screw hole 24.
[0027]
Here, the cylinder block of the internal combustion engine E is configured by the upper block 10 and the lower block 20. The crankshaft 40 (see FIG. 1), which is connected via a connecting rod to a piston (not shown) reciprocally fitted to each of the cylinders and is driven to rotate, has a rotation axis L2 that corresponds to the upper block 10. The upper block 10 is rotatably supported via a plurality of main bearings so as to be located on a plane including the mating surfaces 11 a and 21 a with the lower block 20.
[0028]
Further, at the right end Ea of the internal combustion engine E, there is provided a drive mechanism having a timing chain rotatably supported by the cylinder head and driving a pair of camshafts of the valve train by the power of the crankshaft 40. A chain cover 41, which is a cover made of an aluminum alloy and covers the drive mechanism, is connected to the upper block 10, the lower block 20, and each right end of the cylinder head by a number of bolts B3. At the right end of the crankshaft 40 protruding from the chain cover 41, auxiliary equipment such as a water pump and an AC generator arranged at a front end Ed which is the other end of the internal combustion engine E in the orthogonal direction D2. A crank pulley 42 around which a transmission belt for driving by the power of the crankshaft 40 is wound is connected.
[0029]
Referring to FIGS. 1 and 4, the first main mount M1 includes a bracket 50 that is coupled to a mounting seat 41a (see also FIG. 2) of a chain cover 41 by a bolt, and a liquid in which a liquid is sealed inside a rubber body. And a mount body 51 composed of a sealed mount. The mount body 51 is coupled to the bracket 50 by bolts, and is coupled to the first upper side frame 1 by bolts inserted into a pair of bosses 52, which are mounting portions formed integrally with the mount body 51. Is done. Further, an auxiliary mount Ma is provided on the first main mount M1. The auxiliary mount Ma includes a bracket 53 connected to the first upper side frame 1 and a torque rod 54 connected to the bracket 53 and the bracket 50.
[0030]
The torque rod 54 includes a pair of bushes 55 and 56, and a rod 57 connecting the bushes 55 and 56. Each of the bushes 55 and 56 includes an outer cylinder 55a, 56a integrally formed with the rod 57, an inner cylinder 55b, 56b, and an annular rubber fixed between the outer cylinder 55a, 56a and the inner cylinder 55b, 56b. 55c, 56c, and are coupled to both brackets 50, 53 by bolts inserted into both inner cylinders 55b, 56b. Among them, the bush 56 connected to the bracket 53 has the rubber 56c in which the hollow portion 56d is formed locally, so that the spring constant is reduced. Therefore, the torque rod 54 absorbs the vibration due to the relatively small roll torque, and the transmission of the vibration to the vehicle body F is interrupted, so that the vibration of the vehicle body F is reduced.
[0031]
Further, as shown in FIG. 1, the second main mount M2 is coupled to a bracket 58 attached to the transmission case Tc of the transmission T, a bracket 59 attached to the second upper frame 2, and both brackets 58, 59. And a mount body 60 made of a rubber mount.
[0032]
Referring to FIGS. 1 and 2, the submount M3 is coupled to the bracket 61 attached to the lower block 20 and the oil pan 30, the bracket 62 attached to the rear cross member 4, and both brackets 61, 62. And a torque rod 63.
[0033]
Referring to FIGS. 2 and 3, the mounting seat 70 to which the bracket 61 is coupled by the bolt B4 is provided on the lower block 20, and is provided on the block side portion 70 a integrally formed with the flange portion 22 and on the oil pan 30. And is divided into a pan-side portion 70b integrally formed with the side wall 30a.
[0034]
The block-side portion 70a includes a pair of first and second bolt boss portions 25 and 26 having mounting surfaces 25a and 26a that are in surface contact with the bracket 61 and formed with screw holes 25b and 26b into which the bolts B4 are screwed. Is done. The two bolt boss portions 25 and 26 are formed integrally with the flange portion 22 so as to protrude upward with an interval in the rotation axis direction D1 and are formed integrally with the bolt boss portion 23.
[0035]
The pan-side portion 70b has mounting surfaces 33a and 34a in surface contact with the bracket 61, and a pair of first and second mounting bolt bosses 33 and 34 in which screw holes 33b and 34b into which the bolts B4 are screwed are formed. Be composed. The two mounting bolt bosses 33 and 34 are formed on the side wall 30a near the bottom 30b (see FIG. 2) of the oil pan 30 at intervals in the rotation axis direction D1 so as to protrude from the wall surface.
[0036]
A plurality of reinforcing ribs integrally formed on the side wall 30a of the oil pan 30 are connected to the first mounting bolt boss 33 and the second mounting bolt boss 34. Specifically, the two mounting bolt bosses 33, 34 are connected by first reinforcing ribs 35 extending in the cylinder axis direction D3 between the mounting bolt bosses 33, 34 and the flange 31, respectively. The first mounting bolt boss 33 and the second mounting bolt boss 34 are connected to each other by a second reinforcing rib 36 extending in the rotation axis direction D1. Each first reinforcing rib 35 includes a pair of ribs 35a and 35b extending parallel to each other. Further, between the first reinforcing ribs 35 in the rotation axis direction D1, a plurality of, in this embodiment, two third reinforcing ribs 37 connecting the second reinforcing ribs 36 and the flange portion 31 are provided. 35, the rigidity of the pan-side mounting seat 70b is further increased.
[0037]
The first mounting bolt boss 33 is formed on the side wall 30 a of the oil pan 30 and is screwed with a drain bolt 43 which is a closing plug for closing a drain passage for discharging lubricating oil to the outside of the oil pan 30. And is integrally formed with the drain boss 38 to be mounted.
[0038]
On the other hand, as shown in FIG. 2, the torque rod 63 includes a pair of bushes 64, 65 and a rod 66 connecting the bushes 64, 65. The bush 64 is composed of an outer cylinder 64a connected to a rod 66, an inner cylinder 64b, and an annular rubber 64c fixed between the outer cylinder 64a and the inner cylinder 64b. , An outer cylinder 64a, a support shaft 65b, and an annular rubber 65c fixed between the outer cylinder 65a and the support shaft 65b. The bush 64 is coupled to the bracket 61 at a position below the mating surface 31a by a pair of bolts B5 at both ends of the support shaft 65b. The bush 65 is coupled to the bracket 61 at a position below the mating surface 31a and near the bottom 30b of the oil pan 30 by a bolt (not shown) inserted into the inner cylinder 65b.
[0039]
Next, the operation and effect of the embodiment configured as described above will be described.
The mounting seat 70 is divided into a block-side portion 70a integrally formed with the flange portion 22 forming the mating surface 22a of the lower block 20 and a pan-side portion 70b integrally formed with the oil pan 30. The block side portion 70a of the mounting seat 70 is joined to the oil pan 30 in the lower block 20 to have higher rigidity by being connected to the block side portion 70a and the pan side portion 70b. Since the rigidity of the block-side portion 70a is increased integrally with the flange portion 22 with little increase in the weight of the lower block 20 due to the rigidity of the flange portion 22, the required rigidity of the pan-side portion 70b is correspondingly increased. Since the increase in the weight of the oil pan 30 for securing the oil pan is suppressed, the rigidity of the flange portion 22 of the lower block 20 is used. It is, while suppressing the weight increase of the internal combustion engine E, the required rigidity is ensured by increasing the rigidity of the mounting seat 70.
[0040]
In addition, the block-side portion 70a extends over a wide range along the mating surface 22a with the oil pan 30 and extends continuously in the rotational axis direction D1 of the crankshaft 40 into the flange portion 22 of the lower block 20. Since it is only required to be integrally formed, the degree of freedom in the formation position of the block side portion 70a utilizing the high rigidity of the portion whose rigidity has been increased in advance and thus the mounting position of the mounting seat 70 is increased. The submount M3 can be mounted at an optimal position in the internal combustion engine E from the viewpoint of arrangement and the like.
[0041]
Further, the load acting on the mounting seat 70 is dispersed to the lower block 20 and the oil pan 30 by the bracket 61 joined across the lower block 20 and the oil pan 30, and the load acting on the oil pan 30 is reduced. In addition, since the relative movement of the lower block 20 and the oil pan 30 on the mating surfaces 22a and 31a is restricted, a decrease in the sealing performance between the two mating surfaces 22a and 31a is prevented.
[0042]
The power unit P is supported by an inertia main shaft mounting method by first and second main mounts M1 and M2 attached to left and right ends Pa and Pb, which are both ends in the rotation axis direction D1, and the power unit P rotates around the roll axis L1. The sub-mount M3 for suppressing roll vibration is mounted on the mounting seat 70 including the block-side portion 70a and the pan-side portion 70b, so that the mounting seat 70 formed from the flange portion 22 of the lower block 20 to the oil pan 30 is formed. Is located farther away from the roll axis L1 than when the mounting seat is formed only on the cylinder block, so that the roll vibration of the power unit P is effectively suppressed, and the vibration of the vehicle body F caused by the roll vibration is reduced. And noise can be reduced. Moreover, since the torque rod 63 is coupled to the bracket 61 at a position below the mating surface 31a and near the bottom 30b of the oil pan 30, the distance from the roll axis L1 to the torque rod 63 is further increased. In addition, roll vibration is more effectively suppressed.
[0043]
Numerous bolt bosses 23 through which bolts B2 for connecting the lower block 20 and the oil pan 30 pass are formed in the flange portion 22, and the block side portion 70a is integrally formed with the flange portion 22 near the bolt boss portion 23. Accordingly, the rigidity of the block-side portion 70a is further increased by the bolt boss portion 23, which is a portion having high rigidity, so that the block-side portion 70a and, consequently, the mounting seat 70 can be downsized. In addition, it is possible to further reduce the weight of the oil pan 30 for increasing the rigidity by reducing the ratio of the pan side portion 70b.
[0044]
The pan-side portion 70b includes first and second mounting bolt bosses 33 and 34 for a bolt B4 connecting the bracket 61 to the pan-side portion 70b. The first reinforcing rib 35 integrally formed with the oil pan 30 is connected to the flange portion 31 of the oil pan 30, and the second reinforcing rib 36 integrally formed with the oil pan 30 is connected to each other to form the first and second reinforcing ribs. The rigidity of the pan-side portion 70b composed of the two mounting bolt bosses 33 and 34 is increased, and the first mounting bolt boss 33 is integrally formed with the drain boss 38 formed on the oil pan 30. Since the rigidity of the pan-side portion 70b is increased by using the rigidity, the increase in weight due to the reinforcing ribs 35 to 37 is suppressed, and Min 70b and rigidity further enhanced, the pan portion 70b, enabling thus miniaturization of the mounting seat 70 is further prevented deformation of the oil pan 30 is.
[0045]
Hereinafter, an embodiment in which a part of the configuration of the above-described embodiment is changed will be described with respect to the changed configuration.
In the above-described embodiment, the cylinder block is configured such that the upper block 10 and the lower block 20 which are separate members are connected by bolts. However, the cylinder block may be configured by a single member in which the cylinder block is integrally formed.
[0046]
In the above-described embodiment, the torque rod 54 is provided as an auxiliary mount only on one of the first main mounts M1 of the two main mounts M1 and M2. However, only the second main mount M2 or both the main mounts M1 and M2 are provided. A torque rod as an auxiliary mount may be provided. In the above-described embodiment, the submount M3 is configured by combining the torque rod 63 and the bracket 61, but may be configured by integrally forming both.
[0047]
Although the vehicle is of the FF type in the above-described embodiment, the vehicle may employ a method of driving the wheels and the mounting position of the internal combustion engine E other than the FF type. Further, the power unit P includes the internal combustion engine E and the transmission T integrally connected to the internal combustion engine E, but the power unit includes only the internal combustion engine or the internal combustion engine and the transmission. The power unit may be mounted on a device other than the vehicle, and the power unit may be supported by a substructure other than the vehicle body.
[0048]
The power unit is used in a vehicle in the above-described embodiment, but may be used in a boat propulsion device such as an outboard motor having a vertically oriented crankshaft.
[Brief description of the drawings]
FIG. 1 is a schematic top plan view illustrating a positional relationship between a power unit and a vehicle body in a front portion of a vehicle on which a power unit according to an embodiment of the present invention is mounted.
FIG. 2 is a perspective view of a main part of an internal combustion engine constituting the power plant shown in FIG.
FIG. 3 is a rear view of an upper block, a lower block, and an oil pan of the internal combustion engine of FIG. 2;
FIG. 4 is a perspective view of a main part of a chain cover and a first main mount of the internal combustion engine of FIG. 2;
[Explanation of symbols]
1, 2, 3 ... frame, 4 ... cross member,
10 ... upper block, 11 ... flange part,
20: Lower block, 21, 22: Flange, 23: Bolt boss, 24: Screw hole, 25, 26: Bolt boss,
Reference numeral 30: oil pan, 31: flange portion, 32: insertion hole, 33, 34: mounting bolt boss portion,
35 to 37: reinforcing ribs, 38: drain boss,
40 ... crankshaft, 41 ... chain cover, 42 ... crank pulley, 43 ... drain bolt,
50 bracket, 51 mount body, 52 boss, 53 bracket, 54 torque rod, 55, 56 bush, 57 rod, 58, 59 bracket, 60 mount body, 61, 62 bracket, 63 ... torque rod, 64, 65 ... bush, 66 ... rod,
70: mounting seat, 70a: block side portion, 70b: pan side portion,
P: power unit, Pa, Pb: end, E: internal combustion engine, T: transmission, F: vehicle body, ..., M1, M2: main mount, M3: submount, Ma: auxiliary mount, D1: rotational axis direction , D2: orthogonal direction, D3: cylinder axis direction, L1: roll axis line, B1 to B5: bolt.

Claims (4)

A power plant having an internal combustion engine provided with a crankshaft and a cylinder block and an oil pan joined at their mating surfaces is provided with a basic structure via a mount attached to a mounting seat formed on the internal combustion engine. In the support structure of the power unit supported by the body,
The mounting seat is divided into a block side portion integrally formed with a flange portion forming the mating surface of the cylinder block, and a pan side portion integrally formed with the oil pan, and the mount is mounted on the block side. A support structure for the power plant, wherein the support structure is connected to the portion and the pan-side portion. A power plant having an internal combustion engine provided with a crankshaft and having a cylinder block and an oil pan joined at their mating surfaces comprises a first and a second main body for supporting the power plant in an inertia spindle mounting system. A power unit supported by a vehicle body by a mount and a submount attached to a mounting seat formed on the internal combustion engine and configured to suppress roll vibration around a roll axis defined by the first and second main mounts. In the support structure,
The mounting seat is divided into a block side portion integrally formed with a flange portion forming the mating surface of the cylinder block, and a pan side portion formed integrally with the oil pan, and the submount is A support structure for a power plant, wherein the support structure is connected to the block-side portion and the pan-side portion. A bolt boss portion for a bolt connecting the cylinder block and the oil pan is formed in the flange portion, and the block side portion is integrally formed with the bolt boss portion and the flange portion. A support structure for a power plant according to claim 1 or 2. The pan-side portion includes first and second mounting bolt bosses for bolts that couple the submount to the pan-side portion, and the first mounting bolt boss and the second mounting bolt boss are respectively The first reinforcing rib integrally formed on the oil pan is connected to a flange portion forming the mating surface of the oil pan, and is connected to each other by a second reinforcing rib integrally formed on the oil pan. 4. The bolt boss of claim 1, wherein the boss is integrally formed with a drain boss to which a plug for closing a drain passage formed in the oil pan is mounted. Power unit support structure.

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