JP2016020647A - Auxiliary member fixing structure and internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technology for improving fitting rigidity of an auxiliary member while restricting an increase in entire weight of internal combustion engine.SOLUTION: Bolt boss parts 82a, 82b, 82c, 82d for use in fixing a water pump are mounted on reinforcing ribs 72a, 72b, 72c arranged to improve rigidity of a cylinder block and at the same time a part of a connecting wall 84 is integrally formed along the reinforcing rib 72c. With this arrangement, a bending load acted on a fitting part 74 can be burdened by the reinforcing ribs 72a, 72b, 72c. Further, in order to improve bending rigidity of the fitting part 74, the existing reinforcing ribs 72a, 72b, 72c are utilized. As a result, fitting rigidity of the water pump can be improved while increasing in entire weight of the internal combustion engine.SELECTED DRAWING: Figure 4

Description

  The present invention relates to an auxiliary member mounting structure for attaching an auxiliary member to an engine member.

  Conventionally, as this type of auxiliary member mounting structure, a water pump mounting boss for mounting a water pump on the cylinder block is formed, and the water pump is mounted on the cylinder block via the water pump mounting boss. Has been proposed (see, for example, Patent Document 1).

  In this auxiliary member mounting structure, the strength and rigidity of the water pump mounting boss are improved by providing the cylinder block with reinforcing ribs for reinforcing the water pump mounting boss.

JP-A-6-299900

  By the way, there are many auxiliary members attached to the engine, such as an alternator and an air compressor, in addition to the above-described water pump. Improvement of the attachment rigidity is a common problem also in such auxiliary members. When the number of places for improving the mounting rigidity increases, it is necessary to provide a large number of dedicated reinforcing ribs. However, if the number of reinforcing ribs increases, the cylinder block shape becomes complicated and the weight increases.

  The present invention has been made in view of the above, and an object of the present invention is to provide a technique for improving the attachment rigidity of an auxiliary member while suppressing an increase in the weight of the entire internal combustion engine.

  The auxiliary member mounting structure and the internal combustion engine of the present invention employ the following means in order to achieve the above-described object.

  According to the preferred embodiment of the auxiliary member mounting structure according to the present invention, the auxiliary member mounting structure for mounting the auxiliary member to the engine member is configured. In the auxiliary member mounting structure, the engine member includes a rigidity improving portion for improving the rigidity of the engine member, first and second mounting portions for attaching the auxiliary member to the engine member, A connecting portion for connecting the second mounting portion. And at least one part of a connection part is comprised so that the rigidity improvement part may be followed.

  The “auxiliary member” in the present invention is a peripheral device necessary for operating the engine in addition to the engine member, and corresponds to a water pump, an alternator, an air compressor, and the like. The “engine member” in the present invention typically corresponds to a cylinder block, but preferably includes a cylinder head and a crankcase.

  According to the present invention, at least a part of the connecting portion that connects the first mounting portion and the second mounting portion is configured to be along the rigidity improving portion for improving the rigidity of the engine member. A load applied to the attachment portion and the second attachment portion, for example, the weight of the auxiliary member can be borne by the rigidity improving portion via the connecting portion. This makes it possible to improve the attachment rigidity of the auxiliary member in a weight efficient manner as compared with the configuration in which the dedicated reinforcing rib for improving the attachment rigidity of the auxiliary member is provided in each attachment portion.

  According to the further form of the auxiliary member mounting structure according to the present invention, the connecting portion is configured in a shape that bypasses the virtual straight line connecting the first and second mounting portions at the shortest distance.

  When the first mounting part and the second mounting part cannot be connected at the shortest distance due to problems on the layout and the like, the auxiliary machine is compared with the case where the first mounting part and the second mounting part are connected at the shortest distance. In some cases, the mounting rigidity of the member is lowered. According to this embodiment, even in such a case, since at least a part of the connecting portion is configured to follow the rigidity improving portion, the auxiliary machine is weight efficient. The attachment rigidity of the member can be improved.

  According to the further form of the auxiliary member mounting structure according to the present invention, at least one of the first and second mounting portions is configured such that at least a part thereof is disposed on the rigidity improving portion.

  According to this embodiment, at least one of the first mounting portion and the second mounting portion is configured such that at least a part thereof is disposed on the rigidity improving portion, so that the mounting rigidity of the auxiliary machine member is further improved. Can do.

  According to the further form of the auxiliary member mounting structure according to the present invention, at least a part of both the first and second mounting portions is configured to be disposed on the rigidity improving portion.

  According to this embodiment, since at least a part of both the first attachment portion and the second attachment portion is configured to be disposed on the rigidity improving portion, the attachment rigidity of the auxiliary member can be further improved. Can do.

  According to the further form of the auxiliary member mounting structure according to the present invention, the auxiliary member mounting structure further includes a third mounting portion for mounting the auxiliary member to the engine member. In addition to the first and second mounting portions, the connecting portion is configured to connect the first and third mounting portions and also connect the second and third mounting portions. The first, second, and third attachment portions and the connecting portion constitute a seal line for attaching the auxiliary machine member to the engine member in a sealed manner.

  According to this embodiment, since the seal line is configured by the first, second, and third attachment portions having improved rigidity and the connecting portion, the sealing performance when the auxiliary machine member is attached to the engine member in a sealed manner is improved. Can be improved.

  According to the further form of the auxiliary member mounting structure according to the present invention, the third mounting portion is configured such that at least a part thereof is disposed on the rigidity improving portion.

  According to this embodiment, since at least a part of the third attachment portion is arranged on the rigidity improving portion in addition to the first attachment portion and the second attachment portion, the attachment rigidity of the auxiliary machine member is increased. This can be further improved.

  According to the further form of the auxiliary member mounting structure according to the present invention, the auxiliary member is a water pump for supplying cooling water. The engine member has a cylinder block, a cylinder head attached to the upper part of the cylinder block, and a crankcase attached to the lower part of the cylinder block. Furthermore, the rigidity improving portion has reinforcing ribs provided on the cylinder block in order to improve the rigidity of the cylinder block. And the water pump is comprised so that it may attach to a cylinder block via the 1st and 2nd attaching part and a connection part.

  According to this form, the weight of the water pump applied to the first mounting portion or the second mounting portion can be borne by the reinforcing rib via the connecting portion that is a part of the seal line. In addition to the weight of the water pump, the first mounting portion and the second mounting portion are subjected to rotational vibrations and rotational fluctuations generated by driving the water pump. The rotational vibrations and rotational fluctuations also occur in the seal line. It can bear with a reinforcement rib via the connection part which is a part. Therefore, the mounting rigidity of the water pump can be improved in a weight efficient manner as compared with the configuration in which the dedicated reinforcing rib for improving the mounting rigidity of the water pump is provided in each mounting portion. And since the seal line is comprised by the 1st and 2nd attachment part and connection part with which rigidity was improved, the sealing performance between a water pump and a cylinder block also improves.

  According to the further form of the auxiliary member mounting structure according to the present invention, the reinforcing rib is configured to extend from the cylinder head side to the crankcase side in the cylinder block.

  According to this embodiment, since the reinforcing rib is configured to extend from the cylinder head side to the crankcase side in the cylinder block, the rigidity of the connecting portion can be further improved. Thereby, the sealing performance between the water pump and the cylinder block is further improved.

  According to the preferable form of the internal combustion engine which concerns on this invention, it is comprised so that a water pump may be attached to an engine member by the auxiliary machinery member attachment structure which concerns on this invention in any one of the aspects mentioned above.

  According to the preferred embodiment of the internal combustion engine of the present invention, the auxiliary pump member mounting structure according to any one of the above-described aspects is configured to mount the water pump to the engine member. An effect similar to the effect exhibited by the machine member mounting structure, for example, an effect of improving the mounting rigidity of the auxiliary machine member with high weight efficiency can be achieved.

  ADVANTAGE OF THE INVENTION According to this invention, the technique which improves the attachment rigidity of an auxiliary machine member can be provided, suppressing the weight increase of the whole internal combustion engine.

1 is a configuration diagram showing an outline of a configuration of an internal combustion engine 1 using an auxiliary member mounting structure according to an embodiment of the present invention. 2 is a perspective view showing an outline of a configuration of a cylinder block 6. FIG. 3 is a side view of a cylinder block 6. FIG. It is a principal part enlarged view which expands and shows the principal part of FIG. FIG. 6 is a YY sectional view of FIG. 5.

  Next, the best mode for carrying out the present invention will be described using examples.

  As shown in FIG. 1, the internal combustion engine 1 according to the present embodiment includes a cylinder head 2, a rocker cover 4 attached to the upper part of the cylinder head 2, and a cylinder block 6 attached to the lower part of the cylinder head 2. And a water pump 8 attached to the cylinder block 6, an upper oil pan 9 attached to the lower part of the cylinder block 6, and a lower oil pan 10 attached to the lower part of the upper oil pan 9. In the embodiment, the internal combustion engine 1 is configured as an in-line four-cylinder engine in which four cylinders are arranged in series. In this embodiment, for the sake of convenience, the rocker cover 4 side, that is, the upper side of the paper surface in FIG. 1 is defined as “upper side” or “upper side”, and the lower oil pan 8 side, that is, the lower side of the paper surface in FIG. Is defined as “downward” or “downward”.

  4 is a perspective view showing an outline of the configuration of the cylinder block 6, FIG. 5 is a side view of the cylinder block 6, and FIG. 6 is an enlarged view of the main part showing the main part of FIG. 7 is a cross-sectional view taken along line YY of FIG. The cylinder block 6 is a part constituting the skeleton of the internal combustion engine 1, and as shown in FIG. 4, a cylinder part 62 in which four cylinder bores 62a are formed, and a lower part of the cylinder part 62 in order to constitute a crank chamber. The skirt part 64 formed integrally. The cylinder block 6 corresponds to “engine member”, “cylinder block”, and “crankcase” in the present invention, and the skirt portion 64 is an example of an implementation configuration corresponding to “crankcase” in the present invention.

  As shown in FIG. 4, a cylinder block water jacket 66 is formed in the cylinder portion 62 so as to surround the four cylinder bores 62a.

  Further, as shown in FIGS. 4 and 5, a plurality of reinforcing ribs 72 a, 72 b, 72 c, 72 d, 72 e, 72 f, 72 g for securing the rigidity of the cylinder portion 62 are provided on the outer wall of the cylinder portion 62. An attachment portion 74 for attaching the pump 8 and a suction passage portion 76 connected to the attachment portion 74 are formed. The reinforcing ribs 72a, 72b, 72c, 72d, 72e, 72f, and 72g are examples of an implementation configuration corresponding to the “rigidity improving portion” and the “reinforcing rib” in the present invention.

  As shown in FIG. 5, the reinforcing ribs 72a, 72b, 72c, 72d, 72e, 72f, and 72g extend in the direction along the axis of the cylinder bore 62a (the vertical direction in FIG. 5). In particular, the reinforcing rib 72 c extends from the lower surface of the cylinder block 6 (the lower end surface of the skirt portion 64) to the upper surface (block upper deck), and the reinforcing ribs 72 d, 72 e, 72 f, 72 g are formed on the lower surface of the cylinder block 6. It extends from the (lower end surface of the skirt portion 64) to the suction passage portion 76.

  The aspect in which the reinforcing rib 72c extends in the direction (vertical direction in FIG. 5) along the axis of the cylinder bore 62a from the lower surface of the cylinder block 6 (lower end surface of the skirt portion 64) to the upper surface (block upper deck). It is an example of the implementation structure corresponding to the aspect in which the reinforcing rib extends from the cylinder head side to the crankcase side.

  The mounting portion 74 is erected on the outer wall of the cylinder block 6, and as shown in FIGS. 4 to 6, four bolt boss portions 82 a, 82 b, 82 c, 82 d in which bolt holes BH are formed, and each bolt boss portion. 82a, 82b, 82c, and 82d.

  That is, the bolt boss portions 82a, 82b, 82c, 82d and the connecting wall 84 protrude from the outer wall of the cylinder block 6 in a direction orthogonal to the axis of the cylinder bore 62a and the arrangement direction of the cylinder bores 62a, as shown in FIG. Is provided. The seating surfaces of the bolt boss portions 82a, 82b, 82c, and 82d and the top surface of the connecting wall 84 are formed flush with each other, and form a sealing surface with the mounting surface of the water pump 8 to the cylinder block 6.

  The bolt hole BH is used for mounting the water pump 8 to the cylinder block 6. The bolt boss portions 82a, 82b, 82c, and 82d correspond to “first and second attachment portions” in the present invention, and the connection wall 84 is an example of an implementation configuration corresponding to the “connection portion” in the present invention. Further, the seat surfaces of the bolt boss portions 82a, 82b, 82c, and 82d and the top surface of the connecting wall 84 are formed flush with each other, and a sealing surface is formed between the mounting surface of the water pump 8 to the cylinder block 6. However, it is an example of the implementation structure corresponding to "the 1st and 2nd attachment part and a connection part comprise the seal line for attaching an auxiliary machine member to an engine member in a sealing form" in this invention.

  The inner side of the mounting portion 74, that is, the inner region surrounded by the bolt boss portions 82 a, 82 b, 82 c, 82 d and the connecting wall 84, communicates with the receiving chamber 86 that communicates with the suction passage portion 76 and the water jacket 66 for cylinder block. The discharge chamber 88 is configured. The receiving chamber 86 and the discharge chamber 88 are partitioned by a partition wall 85.

  The partition wall 85 is formed so as to protrude from the outer wall of the cylinder block 6 in a direction orthogonal to the axis of the cylinder bore 62a and the arrangement direction of the cylinder bore 62a, and the top surface includes the seating surfaces of the bolt boss portions 82a, 82b, 82c, and 82d. It is formed flush with the top surface of the connecting wall 84, and forms a seal surface with the bolt boss portions 82a, 82b, 82c, 82d and the connecting wall 84 and the mounting surface of the water pump 8 to the cylinder block 6. . Here, the heights of the bolt boss portions 82a, 82b, 82c, and 82d, the connecting wall 84, and the partition wall 85 are formed higher than the height of the reinforcing rib 72c.

  Further, as shown in FIGS. 5 and 6, the bolt boss portions 82a and 82b are provided immediately above the reinforcing ribs 72a and 72b, respectively, and the bolt boss portions 82c and 82d are respectively on the reinforcing rib 72c and the reinforcing ribs. 72c is provided so as to be in contact with 72c.

  Further, a connecting wall 84 for connecting the bolt boss portions 82c, 82d is integrated with the reinforcing rib 72c and extends from the bolt boss portion 82c along the reinforcing rib 72c. That is, a part of the connecting wall 84 extends integrally with the reinforcing rib 72c from the bolt boss portion 82c along the axis of the cylinder bore 62a upward (upward in FIG. 5).

  The connecting wall 84 once bends approximately 90 degrees in the cylinder bore arrangement direction and extends to the rib 72d, and then extends again in the direction along the axis of the cylinder bore 62a (upward in FIG. 5). In other words, the connecting wall 84 is continuous with the reinforcing rib 72d and extends on an extension line of the reinforcing rib 72d. Thereafter, the connecting wall 84 is bent by approximately 90 degrees in the cylinder bore arrangement direction toward the bolt boss portion 82d, and is connected to the bolt boss portion 82d.

  That is, it can be said that the connecting wall 84 that connects the bolt boss portions 82c and 82d is configured to bypass a virtual straight line that connects the bolt boss portions 82c and 82d with the shortest distance.

  The aspect in which the bolt boss portions 82a, 82b, 82c, and 82d are provided on the reinforcing ribs 72a, 72b, and 72c is the “first or second mounting portion in the present invention, at least partly disposed on the rigidity improving portion. Part of the connecting wall 84 extends integrally with the reinforcing rib 72c in the direction along the axis of the cylinder bore 62a (upward in FIG. 5) from the bolt boss portion 82c. Is an example of an implementation configuration corresponding to “at least a part of the connecting portion is configured along the rigidity improving portion” in the present invention.

  The suction passage portion 76 is sent by a water pump 8 to a water jacket for cylinder head (not shown) and a water jacket 66 for cylinder block, and the cooling water after cooling each part of the internal combustion engine 1 is passed through a radiator (not shown). And is configured as a return passage for returning to the suction port of the water pump 8 again, as shown in FIGS. 4 and 5, from one end side in the cylinder bore arrangement direction of the cylinder block 6 (right side in FIGS. 4 and 5). In the connecting wall 84, the cylinder block 6 has a length corresponding to approximately three cylinders up to a portion extending upward (upward in FIG. 5) along the axis of the cylinder bore 62a on the extension line of the reinforcing rib 72d. It is formed integrally with the outer wall of the.

  The water pump 8 is configured as a spiral centrifugal pump that circulates cooling water. As shown in FIG. 1, the crank pulley CP fixed to a crankshaft (not shown) and a rotating shaft of the water pump 8 are fixed. It is driven by transmitting the rotational force of the crankshaft via a timing belt BLT that is attached and fixed to (not shown) and wound around the water pump pulley WP.

  The water pump 8 is attached and fixed in a cantilever manner to the attachment portion 74 by a fastening bolt (not shown) via a liquid gasket made of, for example, FIPG (on-site molded gasket).

  Next, the operation of the auxiliary member mounting structure according to the present embodiment will be described. When the water pump 8 is attached to the attachment portion 74 in a cantilever manner, the bending load due to the weight of the water pump 8 is applied to the attachment portion 74 via bolt boss portions 82a, 82b, 82c, and 82d to which fastening bolts are fastened. Timing belt B

  However, in the internal combustion engine 1 using the auxiliary member mounting structure according to the present embodiment, the bolt boss portions 82a, 82b, 82c, 82d are installed on the reinforcing ribs 72a, 72b, 72c, and the bolt boss portions 82c, 82d are installed. Of the connecting wall 84 to be connected, a portion extending from the bolt boss portion 82c is integrally formed along the reinforcing rib 72c, so that a bending load acting on the mounting portion 74 can be applied to the bolt boss portions 82a, 82b, 82c, 82d and the connection. It is configured to bear by the reinforcing ribs 72a, 72b, 72c via the portion 84.

  Thereby, the bending rigidity in the direction in alignment with the axis line of the cylinder bore 62a in the attaching part 74 is improved. Further, since the reinforcing rib 72c extends from the lower surface of the cylinder block 6 (the lower end surface of the skirt portion 64) to the upper surface (the block upper deck), the rigidity of the mounting portion 74 is more effectively improved. ing.

  In addition, since a part of the connecting wall 84 that connects the bolt boss portions 82c and 82d is configured to extend on the extended line of the reinforcing rib 72d continuously to the reinforcing rib 72d, it follows the axis of the cylinder bore 62a in the mounting portion 74. The bending rigidity in the direction is further improved.

  Further, the connecting wall 84 extending on the extension line of the reinforcing rib 72d is connected to the suction passage portion 76 extending from one end side (the right side in FIGS. 4 and 5) of the cylinder block 6 in the cylinder bore arrangement direction. Therefore, the bending rigidity in the cylinder bore arrangement direction in the mounting portion 74 is also improved.

  As a result, it is possible to reduce the bending load due to the weight of the water pump 8 acting on the mounting portion 74 and the bending load due to the vibration caused by the operation of the timing belt BLT and the internal combustion engine 1.

  Moreover, in the internal combustion engine 1 using the auxiliary member mounting structure according to the present embodiment, the reinforcing rib 72a provided to improve the rigidity of the cylinder block 6 in order to improve the bending rigidity of the mounting portion 74, Since the configuration uses 72b and 72c, an increase in the weight of the entire internal combustion engine 1 can be suppressed as compared with the conventional structure in which a dedicated reinforcing rib is provided in order to improve the bending rigidity of the mounting portion 74.

  In the present embodiment, the bolt boss portions 82a, 82b, 82c, and 82d are arranged on the reinforcing ribs 72a, 72b, and 72c. However, the bolt boss portions 82a, 82b, 82c, and 82d are provided on the reinforcing ribs 72a, 72b, and 72c. It may not be arranged.

  In the present embodiment, the bolt boss portions 82a and 82b are provided directly above the reinforcing ribs 72a and 72b, respectively. It is good also as a structure which provides one part on reinforcement rib 72a, 72b, respectively.

  For example, the bolt boss portions 82a and 82b may be provided on the reinforcing ribs 72a and 72b so as to be in contact with the reinforcing ribs 72a and 72b, respectively. In addition, the bolt boss portions 82c and 82d are provided on the reinforcing rib 72c so as to be in contact with the reinforcing rib 72c, but the bolt boss portions 82c and 82d may be provided directly on the reinforcing rib 72c.

  In the present embodiment, the portion of the connecting wall 84 that connects the bolt boss portions 82c and 82d that extends from the bolt boss portion 82c is integrated with the reinforcing rib 72c and along the reinforcing rib 72c. All of the connecting walls 84 that connect 82d may be integrated with the reinforcing rib 72c.

  In the present embodiment, the connecting wall 84 is integrally and along the reinforcing rib 72c. However, the connecting wall 84 is not limited to the reinforcing rib 72c, but is provided with a portion provided to improve the rigidity of the cylinder block 6, such as a thick portion or A configuration in which the connecting wall 84 is integrally and along the built-up portion or the like may be employed.

  In the present embodiment, the connecting wall 84 that connects the bolt boss portions 82c and 82d is integrated with the reinforcing rib 72c, but is not limited thereto. For example, the connecting wall 84 for connecting the bolt boss portions 82a and 82b, the connecting wall 84 for connecting the bolt boss portions 82b and 82c, the connecting wall 84 for connecting the bolt boss portions 82d and 82a, or all of these connecting walls 84 are connected to the cylinder block 6. It is good also as a structure which is united and along one of the reinforcement ribs provided in order to improve the rigidity of.

  In the present embodiment, in order to improve the rigidity of the cylinder block 6, the reinforcing ribs 72a, 72b, 72c, 72d, 72e, 72f, 72g extending in the direction along the axis of the cylinder bore 62a are provided. Not limited to. For example, a reinforcing rib extending in the cylinder bore arrangement direction may be provided, or a reinforcing rib extending in a direction along a straight line intersecting the axis of the cylinder bore 62a may be provided. In this case, the connecting wall 84 may be integrally and along the reinforcing rib extending in the cylinder bore arrangement direction and the reinforcing rib extending in the direction along the straight line intersecting the axis of the cylinder bore 62a.

  In the present embodiment, the case where the water pump 8 is attached to the cylinder block 6 has been described as an example of the auxiliary machine attachment structure. However, for example, the auxiliary pump is attached to the cylinder block 6 such as an alternator or an air compressor. It may be applied.

  This embodiment shows an example for carrying out the present invention. Therefore, the present invention is not limited to the configuration of the present embodiment. The correspondence between each component of the present embodiment and each component of the present invention is shown below.

1 Internal combustion engine (internal combustion engine)
2 Cylinder head (engine member, cylinder head)
4 Rocker cover 6 Cylinder block (engine member, cylinder block, crankcase)
8 Water pump (water pump)
9 Upper oil pan 10 Lower oil pan 22 Upper deck 24 Lower deck 62 Cylinder part 62a Cylinder bore 64 Skirt part (crankcase)
66 Water jacket 72a for cylinder block Reinforcement rib (stiffness improvement part, reinforcement rib)
72b Reinforcement rib (stiffness improvement part, reinforcement rib)
72c Reinforcement rib (Rigidity improvement part, reinforcement rib)
72d Reinforcement rib (stiffness improvement part, reinforcement rib)
72e Reinforcement rib (Rigidity improvement part, reinforcement rib)
72f Reinforcement rib (Rigidity improvement part, reinforcement rib)
72g Reinforcement rib (stiffness improvement part, reinforcement rib)
74 Mounting portion 76 Suction passage portion 82a Bolt boss portion (first mounting portion, second mounting portion)
82b Bolt boss part (first attachment part, second attachment part)
82c Bolt boss part (first attachment part, second attachment part)
82d Bolt boss part (first attachment part, second attachment part)
84 Connecting wall (connecting part)
85 Partition wall 86 Reception chamber 88 Discharge chamber 92 Support wall 92a Bearing portion 94 Crank chamber VMC Valve mechanism chamber BH Bolt hole

Claims (9)

An auxiliary member attachment structure for attaching an auxiliary member to an engine member,
The engine member includes a rigidity improving portion for improving the rigidity of the engine member, first and second attachment portions for attaching the auxiliary member to the engine member, and the first and second attachment portions. A connecting portion for connecting,
An auxiliary member mounting structure in which at least a part of the connecting portion is configured to follow the rigidity improving portion.   The auxiliary member mounting structure according to claim 1, wherein the connecting portion is configured to bypass a virtual straight line connecting the first and second mounting portions with a shortest distance.   The auxiliary member mounting structure according to claim 1 or 2, wherein at least one of the first and second mounting portions is configured so that at least a part thereof is disposed on the rigidity improving portion.   3. The accessory member mounting structure according to claim 1, wherein at least a part of both of the first and second mounting portions is configured to be disposed on the rigidity improving portion. A third attachment portion for attaching the auxiliary member to the engine member;
The connecting portion is configured to connect the first and third mounting portions, in addition to the first and second mounting portions, and to connect the second and third mounting portions,
The said 1st, 2nd and 3rd attachment part and the said connection part comprise any one of the Claims 1 thru | or 4 which comprise the seal line for attaching the said auxiliary machinery member to the said engine member in the sealing form. Auxiliary equipment mounting structure.   The auxiliary member mounting structure according to claim 5, wherein at least a part of the third mounting portion is arranged on the rigidity improving portion. The auxiliary machine member is a water pump for supplying cooling water,
The engine member includes a cylinder block, a cylinder head disposed at an upper portion of the cylinder block, and a crankcase disposed at a lower portion of the cylinder block,
The rigidity improving portion has a reinforcing rib provided on the cylinder block in order to improve the rigidity of the cylinder block.
At least a part of the connecting portion is configured to follow the reinforcing rib,
The auxiliary member mounting structure according to claim 5 or 6, wherein the water pump is configured to be mounted to the cylinder block via the first, second and third mounting portions and the connecting portion.   The auxiliary member mounting structure according to claim 7, wherein the reinforcing rib is configured to extend from the cylinder head side to the crankcase side in the cylinder block.   An internal combustion engine configured to attach the water pump to the engine member by the accessory member attaching structure according to any one of claims 1 to 8.

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