Patent Publication Number: US-2017363038-A1

Title: Cylinder block for internal combustion engine and method for producing same

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application is based on and claims the benefit of Japanese Patent Application No. 2016-119938, filed on Jun. 16, 2016, which is incorporated by reference herein in its entirety. 
     BACKGROUND 
     Technical Field 
     The present disclosure relates to a cylinder block for an internal combustion engine including a metal section and a resin section, and a method for producing the same. 
     Background Art 
     There is known a cylinder block for an internal combustion engine including a metal section and a resin section. An example of the cylinder block for an internal combustion engine of this kind is described in JP 05-296103 A, for example. 
     In the cylinder block for an internal combustion engine described in JP 05-296103 A, a water jacket wall (that is, a member forming the outer wall of a water jacket) is formed with a resin material. 
     JP 05-296103 A is a patent document which may be related to the present disclosure. 
     SUMMARY 
     JP 05-296103 A does not describe a head bolt female screw portion that is screwed onto a head bolt male screw portion of a head bolt that fastens the cylinder block and a cylinder head. Further, in JP 05-296103 A, a screw head of a crank cap bolt that fastens the cylinder block and a bearing cap (crank cap) is illustrated, but a crank cap bolt female screw portion that is screwed onto a male screw portion thereof is not described. 
     Even if the head bolt female screw portion and the crank cap bolt female screw portion are formed with a metal material, where the head bolt female screw portion and the crank cap bolt female screw portion are connected via a resin section formed by a resin material, the resin section may be deformed when a large upward load is applied to the head bolt female screw portion by a large fastening force of the head bolt. Further, when a large downward load is applied to a crankshaft due to a combustion pressure, and with this, a large downward load is applied to the crank cap bolt female screw portion, the resin section may also be deformed. 
     Further, JP 05-296103 A does not describe a cylinder liner. 
     If a cylinder liner is provided and a configuration that restrains deformation of the cylinder liner is not provided, the cylinder liner is pushed downward via a head gasket at the time of fastening the head bolt, for example, and with this, the cylinder liner may be deformed. 
     In the light of the aforementioned problem, the present disclosure has an object to provide a cylinder block for an internal combustion engine that can restrain deformation of a resin section and a cylinder liner and a method for manufacturing the same. 
     A cylinder block for an internal combustion engine according to the present disclosure includes: a metal section formed with a metal material; and a resin section. The metal section includes: a cylinder liner; a head bolt female screw portion that is screwed onto a male screw portion of a head bolt that fastens the cylinder block and a cylinder head; a crank cap bolt female screw portion that is screwed onto a male screw portion of a crank cap bolt that fastens the cylinder block and a crank cap; and a columnar portion that connects the head bolt female screw portion and the crank cap bolt female screw portion. The cylinder liner and the columnar portion are integrated with each other. 
     Namely, in the cylinder block for an internal combustion engine according to the present disclosure, the cylinder block is configured by the metal section and the resin section. Further, the head bolt female screw portion that is formed with a metal material and the crank cap bolt female screw portion that is formed with a metal material are joined and integrated with each other with, interposed therebetween, the columnar portion that is formed with a metal material. 
     Consequently, in the cylinder block for an internal combustion engine according to the present disclosure, when a large upward load is applied to the head bolt female screw portion by a large fastening force of the head bolt, the load is received by the columnar portion. That is, the load is not directly applied to the resin section. Further, when a large downward load is applied to the crankshaft by a combustion pressure, and with this, a large downward load is applied to the crank cap bolt female screw portion, the load is received by the columnar portion. That is, the load is not directly applied to the resin section. 
     As a result, the cylinder block for an internal combustion engine according to the present disclosure can reduce the possibility that the resin section of the cylinder block is deformed by a large fastening force of the head bolt or a combustion pressure. 
     Furthermore, in the cylinder block for an internal combustion engine according to the present disclosure, the cylinder liner is integrated with the columnar portion that is formed with a metal material. 
     Consequently, in the cylinder block for an internal combustion engine according to the present disclosure, when a downward load that pushes the cylinder liner is applied to the cylinder liner via a head gasket at the time of fastening of the head bolt, the load is received by the columnar portion. 
     As a result, in the cylinder block for an internal combustion engine according to the present disclosure, deformation of the cylinder liner can be restrained compared with an example where the downward load that pushes the cylinder liner at the time of fastening of the head bolt is applied to only the cylinder liner. 
     In the cylinder block for an internal combustion engine according to the present disclosure, the cylinder liner may include at least a first cylinder liner and a second cylinder liner. The metal section may include: a beam-shaped portion that is disposed between the first cylinder liner and the second cylinder liner and that joins the first cylinder liner and the second cylinder liner; and a crank journal portion that slides in contact with a crank journal. The head bolt female screw portion may include a first head bolt female screw portion that is disposed at one end portion of the beam-shaped portion, and a second head bolt female screw portion that is disposed at the other end portion of the beam-shaped portion. The columnar portion may include a first columnar portion and a second columnar portion. The crank cap bolt female screw portion may include a first crank cap bolt female screw portion that is connected to the first head bolt female screw portion via the first columnar portion, and a second crank cap bolt female section that is connected to the second head bolt female screw portion via the second columnar portion. The crank journal portion may connect the first crank cap bolt female screw portion and the second crank cap bolt female screw portion. The first cylinder liner, the second cylinder liner, the beam-shaped portion, the first columnar portion, the second columnar portion and the crank journal portion may be integrated with each other. 
     Namely, in the aforementioned cylinder block for an internal combustion engine, the first cylinder liner and the second cylinder liner are joined via the beam-shaped portion. That is, the first cylinder liner and the beam-shaped portion  1   a   5   b  are joined to each other, and further, the beam-shaped portion and the second cylinder liner are joined to each other. 
     Consequently, in the aforementioned cylinder block for an internal combustion engine, an outer circumferential surface of a cylindrical first cylinder liner and an outer circumferential surface of a cylindrical second cylinder liner are directly joined to each other, and the strength of the joint between the first cylinder liner and the second cylinder liner can be enhanced compared with an example where the surface of the joint between the first cylinder liner and the second cylinder liner is very small. 
     Furthermore, in the aforementioned cylinder block for an internal combustion engine, the first head bolt female screw portion and the second head bolt female screw portion are provided. Also, the first head bolt female screw portion and the second head bolt female screw portion are formed in the beam-shaped portion and are integrated with the beam-shaped portion. 
     Consequently, in the aforementioned cylinder block for an internal combustion engine, the rigidity with respect to the fastening force of the head bolt can be enhanced compared with an example where the first head bolt female screw portion and the second head bolt female screw portion are configured as separate metal sections. 
     Further, in the aforementioned cylinder block for an internal combustion engine, the first crank cap bolt female screw portion and the second crank cap bolt female screw portion are provided. Also, the first crank cap bolt female screw portion and the second crank cap bolt female screw portion are connected via the crank journal portion. 
     Consequently, in the aforementioned cylinder block for an internal combustion engine, the rigidity with respect to a combustion pressure can be enhanced compared with an example where the first crank cap bolt female screw portion and the second crank cap bolt female screw portion are configured as separate metal portions. 
     Furthermore, in the aforementioned cylinder block for an internal combustion engine, the first columnar portion that connects the first head bolt female screw portion and the first crank cap bolt female screw portion, and the second columnar portion that connects the second head bolt female screw portion and the second crank cap bolt female screw portion are integrated via the beam-shaped portion and the crank journal portion. 
     Consequently, in the aforementioned cylinder block for an internal combustion engine, the rigidity with respect to the fastening force of the head bolt and the combustion pressure can be enhanced compared with an example where the first columnar portion and the second columnar portion are configured as separate metal portions. 
     In the cylinder block for an internal combustion engine according to the present disclosure, the first columnar portion may include a first support portion that supports a bottom portion of the first cylinder liner, and a second support portion that supports a bottom portion of the second cylinder liner. Also, the second columnar portion may include a third support portion that supports the bottom portion of the first cylinder liner, and a fourth support portion that supports the bottom portion of the second cylinder liner. 
     Namely, in the aforementioned cylinder block for an internal combustion engine, the bottom portion of the first cylinder liner is supported by the first support portion provided at the first columnar portion and the third support portion provided at the second columnar portion, and the bottom portion of the second cylinder liner is supported by the second support portion provided at the first columnar portion and the fourth support portion provided at the second columnar portion. 
     Consequently, when the first cylinder liner and the second cylinder liner are pushed downward via the head gasket at the time of fastening of the head bolt, the aforementioned cylinder block for an internal combustion engine can reduce the possibility of the first cylinder liner and the second cylinder liner being deformed, in detail, the possibility of the first cylinder liner and the second cylinder liner being separated from the beam-shaped portion, compared with an example where the first support portion and the third support portion are not provided at the first columnar portion and the second support portion and the fourth support portion are not provided at the second columnar portion. 
     In the method for producing the cylinder block for an internal combustion engine according to the present disclosure, wherein, after a water jacket outer wall member made of a resin for forming a water jacket and the metal section are integrated with each other, the metal section and the water jacket outer wall member may be wrapped by casting with a casting resin material that forms the resin section. 
     Namely, in the method for producing the aforementioned cylinder block for an internal combustion engine, the water jacket outer wall member is not formed with a casting resin material at the time of the metal section being wrapped by casting with the casting resin material that forms the resin section, but the water jacket outer wall member which is formed with a resin material is joined to the metal section before the metal section is wrapped by casting with the casting resin material forming the resin section. Further, after the water jacket outer wall member is joined to the metal section, the metal section and the water jacket outer wall member are wrapped by casting with the casting resin material. 
     Consequently, in the method for producing the aforementioned cylinder block for an internal combustion engine, the sealing performance of the water jacket can be enhanced compared with an example illustrated in FIG. 8 in JP 05-296103 A. 
     According to the present disclosure, deformation of the resin section and the cylinder liner can be restrained. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a schematic perspective view of a cylinder block  1  for an internal combustion engine according to a first embodiment; 
         FIG. 2  is a sectional view including the center axis of No.  1  cylinder # 1  of the cylinder block  1  for an internal combustion engine according to the first embodiment; 
         FIG. 3  is a sectional view including the center axes of head bolt screw holes  1   b   1   c  and  1   b   1   d  of the cylinder block  1  for an internal combustion engine according to the first embodiment; 
         FIG. 4  is a schematic perspective view of a metal section la, a water jacket outer wall member  1   c  and a water jacket  1   d  of the cylinder block  1  (see  FIG. 1 ) for an internal combustion engine according to the first embodiment; 
         FIG. 5  is a sectional view of the metal section  1   a,  the water jacket outer wall member  1   c  and the water jacket  1   d  including the center axis of No.  1  cylinder # 1 ; 
         FIG. 6  is a sectional view of the metal section  1   a,  the water jacket outer wall member  1   c  and the water jacket  1   d  including the center axes of head bolt female screw portions  1   a   2   c  and  1   a   2   d;    
         FIGS. 7A and 7B  are perspective views illustrating parts on the upper side of bottom portions  1   a   1   a   1 ,  1   a   1   b   1 ,  1   a   1   c   1  and  1   a   1   d   1  of cylinder liners  1   a   1   a,    1   a   1   b,    1   a   1   c  and  1   a   1   d  of the metal section  1   a  illustrated in  FIG. 4 ; and 
         FIGS. 8A and 8B  are perspective views illustrating parts on the upper side of beam-shaped portions  1   a   5   a,    1   a   5   b,    1   a   5   c,    1   a   5   d  and  1   a   5   e  of the metal section  1   a  illustrated in  FIG. 4 . 
     
    
    
     DETAILED DESCRIPTION 
     Hereinafter, a first embodiment concerning a cylinder block for an internal combustion engine according to the present disclosure will be described.  FIG. 1  is a schematic perspective view of a cylinder block  1  for an internal combustion engine according to the first embodiment. In more detail,  FIG. 1  is a perspective view of a metal section  1   a  (see  FIG. 4 ) that is a part of the cylinder block  1  in through view. Further, in  FIG. 1 , No.  1  cylinder # 1  of the cylinder block  1  is illustrated in section. 
       FIG. 2  is a sectional view including the center axis of No.  1  cylinder # 1  of the cylinder block  1  for an internal combustion engine according to the first embodiment.  FIG. 3  is a sectional view including the center axes of head bolt screw holes  1   b   1   c  and  1   b   1   d  (see  FIG. 1 ) of the cylinder block  1  for an internal combustion engine according to the first embodiment. In detail, in  FIGS. 2 and 3 , not only a resin section  1   b  of the cylinder block  1 , but also the metal section  1   a,  a water jacket outer wall member  1   c,  and a water jacket  1   d  that is formed by the metal section  1  a and the water jacket outer wall member  1   c  are illustrated. 
       FIG. 4  is a schematic perspective view of the metal section  1   a,  the water jacket outer wall member  1   c  and the water jacket  1   d  of the cylinder block  1  (see  FIG. 1 ) for an internal combustion engine according to the first embodiment. In  FIG. 4 , No.  1  cylinder # 1  is illustrated in section. 
       FIG. 5  is a sectional view of the metal section  1   a,  the water jacket outer wall member  1   c  and the water jacket  1   d  including the center axis of No.  1  cylinder # 1 .  FIG. 6  is a sectional view of the metal section  1   a,  the water jacket outer wall member  1   c  and the water jacket  1   d  including the center axes of head bolt female screw portions  1   a   2   c  and  1   a   2   d.    
       FIGS. 7A and 7B  are perspective views illustrating parts on the upper side of bottom portions  1   a   1   a   1 ,  1   a   1   b   1 ,  1   a   1   c   1  and  1   a   1   d   1  of cylinder liners  1   a   1   a,    1   a   1   b,    1   a   1   c  and  1   a   1   d  of the metal section  1   a  illustrated in  FIG. 4 . In detail,  FIGS. 7A and 7B  differ only in indication of reference signs, and are common in substantial part.  FIGS. 8A and 8B  are perspective views illustrating parts on the upper side of beam-shaped portions  1   a   5   a,    1   a   5   b,    1   a   5   c,    1   a   5   d  and  1   a   5   e  of the metal section  1   a  illustrated in  FIG. 4 . In detail,  FIGS. 8A and 8B  differ only in indication of reference sings, and are common in substantial part. 
     In the cylinder block  1  for an internal combustion engine of the first embodiment, the metal section  1   a  (see  FIG. 4 ) that is formed with a metal material, and a resin section  1   b  (see  FIG. 1 ) that is formed with a casting resin material are provided. 
     In the example illustrated in  FIG. 4  to which the cylinder block  1  for an internal combustion engine of the first embodiment is applied, in the metal section  1   a,  the cylinder liner  1   a   1   a  for No.  1  cylinder # 1 , the cylinder liner  1   a   1   b  for No.  2  cylinder # 2 , the cylinder liner  1   a   1   c  for No.  3  cylinder # 3 , and the cylinder liner  1   a   1   d  for No.  4  cylinder # 4  are provided. The cylinder liners  1   a   1   a,    1   a   1   b,    1   a   1   c  and  1   a   1   d  can be formed with a ferrous metal material, or aluminum, for example. 
     Further, in the example illustrated in  FIGS. 4, 6, 8A and 8B  to which the cylinder block  1  for an internal combustion engine of the first embodiment is applied, head bolt female screw portions  1   a   2   a,    1   a   2   b,    1   a   2   c,    1   a   2   d,    1   a   2   e,    1   a   2   f,    1   a   2   g,    1   a   2   h,    1   a   2   i  and  1   a   2   j  that are screwed onto male screw portions (not illustrated) of head bolts (not illustrated) that fasten the cylinder block  1  and a cylinder head (not illustrated) are provided in the metal section  1   a.  That is, in the example illustrated in  FIGS. 4, 6, 8A and 8B , ten head bolts are used to fasten the cylinder block  1  and the cylinder head, and ten head bolt female screw portions  1   a   2   a,    1   a   2   b,    1   a   2   c,    1   a   2   d,    1   a   2   e,    1   a   2   f,    1   a   2   g,    1   a   2   h,    1   a   2   i  and  1   a   2   j  are formed in the metal section  1   a.    
     In the example illustrated in  FIGS. 1, 3, 4, 6, 8A and 8B , a head bolt screw hole  1   b   1   c  (see  FIGS. 1 and 3 ) corresponding to the head bolt female screw portion  1   a   2   c  (see  FIGS. 3, 4, 6, 8A and 8B ) of the metal section  1   a  is formed in the resin section  1   b.  Also, a head bolt screw hole  1   b   1   d  (see  FIGS. 1 and 3 ) corresponding to the head bolt female screw portion  1   a   2   d  (see  FIGS. 3, 6, 8A and 8B ) of the metal section  1   a  is formed in the resin section  1   b.  Likewise, head bolt screw holes (not illustrated) corresponding to the head bolt female screw portions  1   a   2   a  and  1   a   2   b  (see  FIGS. 8A and 8B ) of the metal section  1   a  are formed in the resin section  1   b.  Further, head bolt screw holes  1   b   1   e,    1   b   1   f,    1   b   1   g,    1   b   1   h,    1   b   1   i  and  1   b   1   j  (see  FIG. 1 ) corresponding to the head bolt female screw portions  1   a   2   e,    1   a   2   f,    1   a   2   g,    1   a   2   h,    1   a   2   i  and  1   a   2   j  (see  FIGS. 8A and 8B ) of the metal section  1   a  are formed in the resin section  1   b.    
     In the example illustrated in  FIGS. 3 and 6  to which the cylinder block  1  for an internal combustion engine of the first embodiment is applied, crank cap bolt female screw portions  1   a   3   c  and  1   a   3   d  that are screwed onto male screw portions (not illustrated) of crank cap bolts (not illustrated) that fasten the cylinder block  1  and crank caps (not illustrated) are provided in the metal section  1   a.  Likewise, in the example illustrated in  FIG. 7A , crank cap bolt female screw portions  1   a   3   a,    1   a   3   b,    1   a   3   e,    1   a   3   f,    1   a   3   g,    1   a   3   h,    1   a   3   i  and  1   a   3   j  that are screwed onto male screw portions of the crank cap bolts that fasten the cylinder block  1  and the crank caps are provided in the metal section  1   a.    
     Further, in the example illustrated in  FIGS. 3 and 6  to which the cylinder block  1  for an internal combustion engine of the first embodiment is applied, the metal section  1   a  is provided with a columnar portion  1   a   4   c  that connects the head bolt female screw portion  1   a   2   c  and the crank cap bolt female screw portion  1   a   3   c,  and a columnar portion  1   a   4   d  that connects the head bolt female screw portion  1   a   2   d  and the crank cap bolt female screw portion  1   a   3   d.    
     Likewise, in the example illustrated in  FIG. 4 , the metal section  1   a  is provided with a columnar portion  1   a   4   e  that connects the head bolt female screw portion  1   a   2   e  and the crank cap bolt female screw portion  1   a   3   e,  a columnar portion  1   a   4   g  that connects the head bolt female screw portion  1   a   2   g  and the crank cap bolt female screw portion  1   a   3   g,  and a columnar portion  1   a   4   i  that connects the head bolt female screw portion  1   a   2   i  and the crank cap bolt female screw portion  1   a   3   i.  Further, in the example illustrated in  FIG. 8A , the metal section  1   a  is provided with a columnar portion  1   a   4   a  that connects the head bolt female screw portion  1   a   2   a  and the crank cap bolt female screw portion  1   a   3   a,  a columnar portion  1   a   4   b  that connects the head bolt female screw portion  1   a   2   b  and the crank cap bolt female screw portion  1   a   3   b,  a columnar portion  1   a   4   f  (see  FIG. 7A ) that connects the head bolt female screw portion  1   a   2   f  and the crank cap bolt female screw portion  1   a   3   f,  a columnar portion  1   a   4   h  (see  FIG. 7A ) that connects the head bolt female screw portion  1   a   2   h  and the crank cap bolt female screw portion  1   a   3   h,  and a columnar portion  1   a   4   j  (see  FIG. 7A ) that connects the head bolt female screw portion  1   a   2   j  and the crank cap bolt female screw portion  1   a   3   j.    
     In the example illustrated in  FIGS. 3 and 6  to which the cylinder block  1  for an internal combustion engine of the first embodiment is applied, hollow portions  1   a   4   c   5  and  1   a   4   d   5  are provided in the columnar portions  1   a   4   c  and  1   a   4   d,  and reduction in weights of the columnar portions  1   a   4   c  and  1   a   4   d  is thus achieved. However, in another example to which the cylinder block  1  for an internal combustion engine of the first embodiment is applied, the hollow portions  1   a   4   c   5  and  1   a   4   d   5  may be omitted instead. 
     Furthermore, in the example illustrated in  FIG. 8A  to which the cylinder block  1  for an internal combustion engine of the first embodiment is applied, the metal section  1   a  is provided with the beam-shaped portions  1   a   5   a,    1   a   5   b,    1   a   5   c,    1   a   5   d  and  1   a   5   e.  The head bolt female screw portion  1   a   2   a  is disposed at one end portion of the beam-shaped portion  1   a   5   a,  and the head bolt female screw portion  1   a   2   b  is disposed at the other end portion of the beam-shaped portion  1   a   5   a.  Likewise, the head bolt female screw portion  1   a   2   c  is disposed at one end portion of the beam-shaped portion  1   a   5   b,  and at the other end portion of the beam-shaped portion  1   a   5   b,  the head bolt female screw portion  1   a   2   d  is disposed. Further, the head bolt female screw portion  1   a   2   e  is disposed at one end portion of the beam-shaped portion  1   a   5   c,  and the head bolt female screw portion  1   a   2   f  is disposed at the other end portion of the beam-shaped portion  1   a   5   c.  The head bolt female screw portion  1   a   2   g  is disposed at one end portion of the beam-shaped portion  1   a   5   d,  and the head bolt female screw portion  1   a   2   h  is disposed at the other end portion of the beam-shaped portion  1   a   5   d.  The head bolt female screw portion  1   a   2   i  is disposed at one end portion of the beam-shaped portion  1   a   5   e,  and the head bolt female screw portion  1   a   2   j  is disposed at the other end portion of the beam-shaped portion  1   a   5   e.    
     In the example illustrated in  FIGS. 6 and 8B  to which the cylinder block  1  for an internal combustion engine of the first embodiment is applied, hollow portions  1   a   5   a   1 ,  1   a   5   b   1 ,  1   a   5   c   1 ,  1   a   5   d   1  and  1   a   5   e   1  are provided in the beam-shaped portions  1   a   5   a,    1   a   5   b,    1   a   5   c,    1   a   5   d  and  1   a   5   e,  and reduction in weights of the beam-shaped portions  1   a   5   a,    1   a   5   b,    1   a   5   c,    1   a   5   d  and  1   a   5   e  is thus achieved. However, in another example to which the cylinder block  1  for an internal combustion engine of the first embodiment is applied, the hollow portions  1   a   5   a   1 ,  1   a   5   b   1 ,  1   a   5   c   1 ,  1   a   5   d   1  and  1   a   5   e   1  may be omitted instead. 
     Further, in the example illustrated in  FIG. 8A  to which the cylinder block  1  for an internal combustion engine of the first embodiment is applied, the beam-shaped portion  1   a   5   b  is disposed between the cylinder liner  1   a   1   a  and the cylinder liner  1   a   1   b  and joins the cylinder liner  1   a   1   a  and the cylinder liner  1   a   1   b.    
     Likewise, in the example illustrated in  FIG. 8A  to which the cylinder block  1  for an internal combustion engine of the first embodiment is applied, the beam-shaped portion  1   a   5   c  is disposed between the cylinder liner  1   a   1   b  and the cylinder liner  1   a   1   c  and joins the cylinder liner  1   a   1   b  and the cylinder liner  1   a   1   c.  Furthermore, the beam-shaped portion  1   a   5   d  is disposed between the cylinder liner  1   a   1   c  and the cylinder liner  1   a   1   d  and joins the cylinder liner  1   a   1   c  and the cylinder liner  1   a   1   d.    
     Further, in the example illustrated in  FIG. 8A  to which the cylinder block  1  for an internal combustion engine of the first embodiment is applied, the beam-shaped portion  1   a   5   a  is joined to the cylinder liner  1   a   1   a.  Likewise, the beam-shaped portion  1   a   5   e  is joined to the cylinder liner  1   a   1   d.    
     Furthermore, in the example illustrated in  FIG. 7A  to which the cylinder block  1  for an internal combustion engine of the first embodiment is applied, the metal section  1   a  is provided with crank journal portions  1   a   6   a,    1   a   6   b,    1   a   6   c,    1   a   6   d  and  1   a   6   e  that slide in contact with crank journals (not illustrated). In detail, the crank cap bolt female screw portions  1   a   3   a  and  1   a   3   b  are connected via the crank journal portion  1   a   6   a.  The crank cap bolt female screw portions  1   a   3   c  and  1   a   3   d  are connected via the crank journal portion  1   a   6   b.  The crank cap bolt female screw portions  1   a   3   e  and  1   a   3   f  are connected via the crank journal portion  1   a   6   c.  The crank cap bolt female screw portions  1   a   3   g  and  1   a   3   h  are connected via the crank journal portion  1   a   6   d.  The crank cap bolt female screw portions  1   a   3   i  and  1   a   3   j  are connected via the crank journal portion  1   a   6   e.    
     That is, in the example illustrated in  FIG. 8A  to which the cylinder block  1  for an internal combustion engine of the first embodiment is applied, the columnar portion  1   a   4   c  and the columnar portion  1   a   4   d  (see  FIG. 7A ) that are integrated with the beam-shaped portion  1   a   5   b  are also integrated with the cylinder liners  1   a   1   a  and  1   a   1   b,  and are also integrated with the crank journal portion  1   a   6   b.  Likewise, the columnar portion  1   a   4   e  and the columnar portion  1   a   4   f  (see  FIG. 7A ) that are integrated with the beam-shaped portion  1   a   5   c  are also integrated with the cylinder liners  1   a   1   b  and  1   a   1   c,  and are also integrated with the crank journal portion  1   a   6   c.  The columnar portion  1   a   4   g  and the columnar portion  1   a   4   h  (see  FIG. 7A ) that are integrated with the beam-shaped portion  1   a   5   d  are also integrated with the cylinder liners  1   a   1   c  and  1   a   1   d,  and are also integrated with the crank journal portion  1   a   6   d.    
     Further, in the example illustrated in  FIG. 8A  to which the cylinder block  1  for an internal combustion engine of the first embodiment is applied, the columnar portions  1   a   4   a  and  1   a   4   b  that are integrated with the beam-shaped portion  1   a   5   a  are also integrated with the cylinder liner  1   a   1   a,  and are also integrated with the crank journal portion  1   a   6   a.  Likewise, the columnar portion  1 a 4 i and the columnar portion  1   a   4   j  (see  FIG. 7A ) that are integrated with the beam-shaped portion  1   a   5   e  are also integrated with the cylinder liners  1   a   1   d,  and are also integrated with the crank journal portion  1   a   6   e.    
     The portions of the metal section  1   a  that are other than the cylinder liners  1   a   1   a,    1   a   1   b,    1   a   1   c  and  1   a   1   d  can be formed with a ferrous metal material, or a metal material having a strength equivalent to the ferrous metal material, for example. 
     In one example to which the cylinder block  1  for an internal combustion engine of the first embodiment is applied, a plurality of portions of the metal section  1   a  can be integrated by, for example, joining the portions. In another example to which the cylinder block  1  for an internal combustion engine of the first embodiment is applied, the metal section  1   a  can be formed with a 3D printer for metals that forms a three-dimensional structure, for example, instead. 
     In the example illustrated in  FIGS. 4, 5, 8A and 8B  to which the cylinder block  1  for an internal combustion engine of the first embodiment is applied, at the time of producing the cylinder block  1  for an internal combustion engine, the water jacket outer wall member  1   c  made of a resin illustrated in  FIGS. 4 and 5  is jointed to outer circumferential surfaces of the cylinder liners  1   a   1   a,    1   a   1   b,    1   a   1   c  and  1   a   1   d  of the metal section  1   a  illustrated in  FIGS. 8A and 8B , and the metal section  1   a  and the water jacket outer wall member  1   c  are thus integrated. As a result, the water jacket  1   d  (see  FIGS. 4 and 5 ) is formed between the outer circumferential surfaces of the cylinder liners  1   a   1   a,    1   a   1   b,    1   a   1   c  and  1   a   1   d  of the metal section  1   a  and the water jacket outer wall member  1   c.    
     Next, the metal section  1   a  and the water jacket outer wall member  1   c  that have been integrated as described above are wrapped by casting with a casting resin material that is used to form the resin section  1   b  (see  FIGS. 1, 2 and 3 ), so that the cylinder block  1  for an internal combustion engine illustrated in  FIGS. 1, 2 and 3  is formed. 
     The cylinder block  1  for an internal combustion engine of the first embodiment has the resin section  1   b,  and can therefore be reduced in weight compared with a cylinder block that is entirely formed with a metal material. Further, the thermal insulation performance of the cylinder liners  1   a   1   a,    1   a   1   b,    1   a   1   c  and  1   a   1   d  can be enhanced by the resin section  1   b,  as a result of which, the warming-up performance of the internal combustion engine (not illustrated) to which the cylinder block  1  is applied can be enhanced, and fuel consumption can be reduced. 
     Further, the cylinder block  1  for an internal combustion engine of the first embodiment has the resin section lb, and therefore can enhance the sound insulation performance compared with the cylinder block that is entirely formed with a metal material. 
     As described above, in the example illustrated in  FIGS. 4, 5, 8A and 8B  to which the cylinder block  1  for an internal combustion engine of the first embodiment is applied, the metal section  1   a  and the water jacket outer wall member  1   c  are integrated by joining the water jacket outer wall member  1   c  made of a resin and the outer circumferential surfaces of the cylinder liners  1   a   1   a,    1   a   1   b,    1   a   1   c  and  1   a   1   d.  However, in another example to which the cylinder block  1  for an internal combustion engine of the first embodiment is applied, the metal section  1   a  and the water jacket outer wall member  1   c  can be integrated by forming the water jacket outer wall member  1   c  using an injection molding with the cylinder liners  1   a   1   a,    1   a   1   b,    1   a   1   c,    1   a   1   d  being inserted in an injection molding die. 
     As described above, the cylinder block  1  for an internal combustion engine of the first embodiment is configured by the metal section  1   a  (see  FIGS. 4, 8A and 8B ) and the resin section  1   b  (see  FIG. 1 ). Further, in the cylinder block  1  for an internal combustion engine of the first embodiment, the head bolt female screw portion  1   a   2   c  that is formed with a metal material and the crank cap bolt female screw portion  1   a   3   c  that is formed with a metal material are joined and integrated with each other with, interposed therebetween, the columnar portion  1   a   4   c  that is formed with a metal material, as illustrated in  FIG. 3 , for example. 
     Consequently, when a large upward load is applied to the head bolt female screw portion  1   a   2   c  by a large fastening force of the head bolt (not illustrated) in the cylinder block  1  for an internal combustion engine of the first embodiment, the load is received by the columnar portion  1   a   4   c.  That is, the load is not directly applied to the resin section  1   b.  Further, when a large downward load is applied to the crankshaft (not illustrated) by a combustion pressure, and with this, a large downward load is applied to the crank cap bolt female screw portion  1   a   3   c,  the load is received by the columnar portion  1   a   4   c.  That is, the load is not directly applied to the resin section  1   b.  As a result, the cylinder block  1  for an internal combustion engine of the first embodiment can reduce the possibility that the resin section  1   b  of the cylinder block  1  is deformed by a large fastening force of the head bolt or a combustion pressure. 
     Furthermore, in the cylinder block  1  for an internal combustion engine of the first embodiment, the cylinder liner  1   a   1   a  is integrated with the columnar portions  1   a   4   a,    1   a   4   b,    1   a   4   c  and  1   a   4   d  (see  FIG. 6 ) that are formed with a metal material, with the beam-shaped portions  1   a   5   a  and  1   a   5   b  interposed therebetween, as illustrated in  FIG. 8A , for example. 
     Consequently, when a downward load that pushes the cylinder liner  1   a   1   a  is applied to the cylinder liner  1   a   1   a  via a head gasket (not illustrated) at the time of fastening of the head bolt in the cylinder block  1  for an internal combustion engine of the first embodiment, the load is received by the columnar portions  1   a   4   a,    1   a   4   b,    1   a   4   c  and  1   a   4   d.  As a result, in the cylinder block  1  for an internal combustion engine of the first embodiment, deformation of the cylinder liner  1   a   1   a  can be restrained compared with an example where the downward load that pushes the cylinder liner  1   a   1   a  at the time of fastening of the head bolt is applied to only the cylinder liner  1   a   1   a.    
     Further, as described above, in the cylinder block  1  for an internal combustion engine of the first embodiment, the cylinder liners  1   a   1   a  and  1   a   1   b  are joined via the beam-shaped portion  1   a   5   b  as illustrated in  FIG. 8A , for example. That is, the cylinder liner  1   a   1   a  and the beam-shaped portion  1   a   5   b  are joined to each other, and further, the beam-shaped portion  1   a   5   b  and the cylinder liner  1   a   1   b  are joined to each other. Consequently, in the cylinder block  1  for an internal combustion engine of the first embodiment, an outer circumferential surface of a cylindrical first cylinder liner and an outer circumferential surface of a cylindrical second cylinder liner are directly joined to each other, and the strength of the joint between the cylinder liner  1   a   1   a  and the cylinder liner  1   a   1   b  can be enhanced compared with an example where the surface of the joint between the first cylinder liner and the second cylinder liner is very small. 
     Furthermore, in the cylinder block  1  for an internal combustion engine of the first embodiment, as illustrated in  FIG. 8A , for example, the head bolt female screw portions  1   a   2   c  and  1   a   2   d  are provided, and the head bolt female screw portions  1   a   2   c  and  1   a   2   d  are formed in the beam-shaped portion  1   a   5   b  and are integrated with the beam-shaped portion  1     1     5   b.  Consequently, in the cylinder block  1  for an internal combustion engine of the first embodiment, the rigidity of the cylinder block  1  with respect to the fastening force of the head bolt (not illustrated) can be enhanced compared with an example where the head bolt female screw portion  1   a   2   c  and the head bolt female screw portion  1   a   2   d  are configured as separate metal sections. 
     Further, in the cylinder block  1  for an internal combustion engine of the first embodiment, as illustrated in  FIG. 6 , for example, the crank cap bolt female screw portions  1   a   3   c  and  1   a   3   d  are provided, and the crank cap bolt female screw portions  1   a   3   c  and  1   a   3   d  are connected via the crank journal portion  1   a   6   b.  Consequently, in the cylinder block  1  for an internal combustion engine of the first embodiment, the rigidity of the cylinder block  1  with respect to a combustion pressure can be enhanced compared with an example where the crank cap bolt female screw portion  1   a   3   c  and the crank cap bolt female screw portion  1   a   3   d  are configured as separate metal portions. 
     Furthermore, in the cylinder block  1  for an internal combustion engine of the first embodiment, as illustrated in  FIG. 6 , for example, the columnar portion  1   a   4   c  that connects the head bolt female screw portion  1   a   2   c  and the crank cap bolt female screw portion  1   a   3   c,  and the columnar portion  1   a   4   d  that connects the head bolt female screw portion  1   a   2   d  and the crank cap bolt female screw portion  1   a   3   d  are integrated via the beam-shaped portion  1   a   5   b  and the crank journal portion  1   a   6   b.    
     Consequently, in the cylinder block  1  for an internal combustion engine of the first embodiment, the rigidity of the cylinder block  1  with respect to the fastening force of the head bolt and the combustion pressure can be enhanced compared with an example where the columnar portion  1   a   4   c  and the columnar portion  1   a   4   d  are configured as separate metal portions. 
     Furthermore, as described above, in a method for manufacturing the cylinder block  1  for an internal combustion engine of the first embodiment, the water jacket outer wall member  1   c  (see  FIGS. 4 and 5 ) is not formed with a casting resin material at the time of the metal section  1   a  (see  FIGS. 4 and 8A ) being wrapped by casting with the casting resin material that forms the resin section lb (see  FIGS. 1, 2 and 3 ), but the water jacket outer wall member  1   c  which is formed with a resin material different from the casting resin material is joined to the metal section  1   a  before the metal section  1   a  is wrapped by casting with the casting resin material forming the resin section  1   b.  Furthermore, after the water jacket outer wall member  1   c  is joined to the metal section  1   a , the metal section  1   a  and the water jacket outer wall member  1   c  are wrapped by casting with the casting resin material. Consequently, in the method for producing the cylinder block  1  for an internal combustion engine of the first embodiment, the sealing performance of the water jacket  1   d  (see  FIGS. 2, 4 and 5 ) can be enhanced compared with an example illustrated in FIG. 8 in JP 05-296103 A. 
     In the example illustrated in  FIGS. 1 and 4 , the four cylinders # 1 , # 2 , # 3  and # 4  are provided in the cylinder block  1  for an internal combustion engine of the first embodiment, but in another example, the cylinder block  1  for an internal combustion engine of the present disclosure can be applied to a cylinder block having an arbitrary number of cylinders, which are one or more cylinders, instead of the above. 
     In the example illustrated in  FIG. 7B  to which the cylinder block  1  for an internal combustion engine of the first embodiment is applied, support portions  1   a   4   a   2 ,  1   a   4   b   2 ,  1   a   4   c   1  and  1   a   4   d   1  that support the bottom portion  1   a   1   a   1  of the cylinder liner  1   a   1   a  (see  FIGS. 8A and 8B ), support portions  1   a   4   c   2 ,  1   a   4   d   2 ,  1   a   4   e   1  and  1   a   4   f   1  that support the bottom portion  1   a   1   b   1  of the cylinder liner  1   a   1   b  (see  FIGS. 8A and 8B ), support portions  1   a   4   e   2 ,  1   a   4   f   2 ,  1   a   4   g   1  and  1   a   4   h   1  that support the bottom portion  1   a   1   c   1  of the cylinder liner  1   a   1   c  (see  FIGS. 8A and 8B ), and support portions  1   a   4   g   2 ,  1   a   4   h   2 ,  1   a   4   i   1  and  1   a   4   j   1  that support the bottom portion  1   a   1   d   1  of the cylinder liner  1   a   1   d  (see  FIGS. 8A and 8B ) are provided. 
     In detail, the support portion  1   a   4   a   2  is provided at the columnar portion  1   a   4   a,  and the support portion  1   a   4   b   2  is provided at the columnar portion  1   a   4   b.  The support portions  1   a   4   c   1  and  1   a   4   c   2  are provided at the columnar portion  1   a   4   c,  and the support portions  1   a   4   d   1  and  1   a   4   d   2  are provided at the columnar portion  1   a   4   d.  The support portions  1   a   4   e   1  and  1   a   4   e   2  are provided at the columnar portion  1   a   4   e,  and the support portions  1   a   4   f   1  and  1   a   4   f   2  are provided at the columnar portion  1   a   4   f.  The support portions  1   a   4   g   1  and  1   a   4   g   2  are provided at the columnar portion  1   a   4   g,  and the support portions  1   a   4   h   1  and  1   a   4   h   2  are provided at the columnar portion  1   a   4   h.  The support portion  1   a   4   i   1  is provided at the columnar portion  1   a   4   i,  and the support portion  1   a   4   j   1  is provided at the columnar portion  1   a   4   j.    
     Consequently, when the cylinder liners  1   a   1   a  and  1   a   1   b  are pushed downward via the head gasket (not illustrated) at the time of fastening of the head bolt (not illustrated), the cylinder block  1  for an internal combustion engine of the first embodiment can reduce the possibility of the cylinder liners  1   a   1   a  and  1   a   1   b  being deformed, in detail, the possibility of the cylinder liners  1   a   1   a  and  1   a   1   b  being separated from the beam-shaped portion  1   a   5   b  (see  FIGS. 8A and 8B ), compared with an example where the support portions  1   a   4   c   1  and  1   a   4   c   2  are not provided at the columnar portion  1   a   4   c  and the support portions  1   a   4   d   1  and  1   a   4   d   2  are not provided at the columnar portion  1   a   4   d.    
     In the example illustrated in  FIGS. 4, 7A, 7B, 8A and 8B  to which the cylinder block  1  for an internal combustion engine of the first embodiment is applied, the metal section  1   a includes the cylinder liners  1   a   1   a,    1   a   1   b,    1   a   1   c  and  1   a   1   d,  the head bolt female screw portions  1   a   2   a,    1   a   2   b,    1   a   2   c,    1   a   2   d,    1   a   2   e,    1   a   2   f,    1   a   2   g,    1   a   2   h,    1   a   2   i  and  1   a   2   j,  the crank cap bolt female screw portions  1   a   3   a,    1   a   3   b,    1   a   3   c,    1   a   3   d,    1   a   3   e,    1   a   3   f,    1   a   3   g,    1   a   3   h,    1   a   3   i  and  1   a   3   j,  and the columnar portions  1   a   4   a,    1   a   4   b,    1   a   4   c,    1   a   4   d,    1   a   4   e,    1   a   4   f,    1   a   4   g,    1   a   4   h,    1   a   4   i  and  1   a   4   j,  and these components are integrated. However, in an another example (an example corresponding to claim  1 ) to which the cylinder block  1  for an internal combustion engine of the first embodiment is applied, instead of the above, the metal section  1   a  may include the cylinder liner  1   a   1   a,  the head bolt female screw portion  1   a   2   a,  the crank cap bolt female screw portion  1   a   3   a  and the columnar portion  1   a   4   a,  the cylinder liner  1   a   1   a  may be integrated with the columnar portion  1   a   4   a,  and the other metal components may be separated from the metal section  1   a.    
     In the example illustrated in  FIGS. 4, 7A, 7B, 8A and 8B  to which the cylinder block  1  for an internal combustion engine of the first embodiment is applied, the metal section  1   a  includes the cylinder liners  1   a   1   a,    1   a   1   b,    1   a   1   c  and  1   a   1   d,  the beam-shaped portions  1   a   5   a,    1   a   5   b,    1   a   5   c,    1   a   5   d  and  1   a   5   e,  the crank journal portions  1   a   6   a,    1   a   6   b,    1   a   6   c,    1   a   6   d  and  1   a   6   e,  the head bolt female screw portions  1   a   2   a,    1   a   2   b,    1   a   2   c,    1   a   2   d,    1   a   2   e,    1   a   2   f,    1   a   2   g,    1   a   2   h,    1   a   2   i  and  1   a   2   j,  the columnar portions  1   a   4   a,    1   a   4   b,    1   a   4   c,    1   a   4   d,    1   a   4   e,    1   a   4   f,    1   a   4   g,    1   a   4   h,    1   a   4   i  and  1   a   4   j,  the crank cap bolt female screw portions  1   a   3   a,    1   a   3   b,    1   a   3   c,    1   a   3   d,    1   a   3   e,    1   a   3   f,    1   a   3   g,    1   a   3   h,    1   a   3   i  and  1   a   3   j,  and these components are integrated. However, in an another example (an example corresponding to claim  2  as originally filed) to which the cylinder block  1  for an internal combustion engine of the first embodiment is applied, instead of the above, the metal section la may include the cylinder liners  1   a   1   a  and  1   a   1   b,  the beam-shaped portion  1   a   5   b,  the crank journal portion  1   a   6   b,  the head bolt female screw portions  1   a   2   c  and  1   a   2   d,  the columnar portions  1   a   4   c  and  1   a   4   d,  and the crank cap bolt female screw portions  1   a   3   c  and  1   a   3   d,  these components may be integrated, and the other metal components may be separated from the metal section  1   a.    
     In the example illustrated in  FIGS. 7A, 8A and 8B  to which the cylinder block  1  for an internal combustion engine of the first embodiment is applied, a support portion  1   a   4   a   2  is provided at the columnar portion  1   a   4   a  of the metal section  1   a , a support portion  1   a   4   b   2  is provided at the columnar portion  1   a   4   b  of the metal section  1   a , support portions  1   a   4   c   1  and  1   a   4   c   2  are provided at the columnar portion  1   a   4   c  of the metal section  1   a,  support portions  1   a   4   d   1  and  1   a   4   d   2  are provided at the columnar portion  1   a   4   d  of the metal section  1   a,  support portions  1   a   4   e   1  and  1   a   4   e   2  are provided at the columnar portion  1   a   4   e  of the metal section  1   a,  support portions  1   a   4   f   1  and  1   a   4   f   2  are provided at the columnar portion  1   a   4   f  of the metal section  1   a,  support portions  1   a   4   g   1  and  1   a   4   g   2  are provided at the columnar portion  1   a   4   g  of the metal section  1   a , support portions  1   a   4   h   1  and  1   a   4   h   2  are provided at the columnar portion  1   a   4   h  of the metal section  1   a,  a support portion  1   a   4   i   1  is provided at the columnar portion  1   a   4   i  of the metal section  1   a,  and a support portion  1   a   4   j   1  is provided at the columnar portion  1   a   4   j  of the metal section  1   a . However, in another example (an example corresponding to claim  3  as originally filed) to which the cylinder block  1  for an internal combustion engine of the first embodiment is applied, instead of the above, the metal section  1   a  may include the cylinder liners  1   a   1   a  and  1   a   1   b,  the beam-shaped portion  1   a   5   b,  the crank journal portion  1   a   6   b,  the head bolt female screw portions  1   a   2   c  and  1   a   2   d,  the columnar portions  1   a   4   c  and  1   a   4   d,  and the crank cap bolt female screw portions  1   a   3   c  and  1   a   3   d.  Also, the support portions  1   a   4   c   1  and  1   a   4   c   2  may be provided at the columnar portion  1   a   4   c,  and the support portions  1   a   4   d   1  and  1   a   4   d   2  may be provided at the columnar portion  1   a   4   d.  Furthermore, these components may be integrated, and the other metal components may be separated from the metal section  1  a. 
     In a second embodiment, the first embodiment and the respective examples described above can be properly combined.