Structure for mounting gasket on block

1. A structure for mounting a gasket on a block, comprising:

a block including:

a fluid channel,

an annular inner wall made of resin and located radially outside an opening of the fluid channel, and

an annular outer wall made of resin and located radially outside the annular inner wall; and

an annular gasket surrounding the opening of the fluid channel,

wherein

the annular inner wall and the annular outer wall allow an axial side of the gasket to be press-fitted therebetween and are elastically deformable in their radial directions,

the annular inner wall has a radial thickness of 0.72 mm to 6 mm,

the radial thickness of the annular inner wall is smaller than a radial thickness of the annular outer wall, and

the radial thickness, f, of the annular inner wall and the radial thickness, b, of the annular outer wall fall within a range defined by the following equations (1) and (2):

b= 2.41 f+ 0.24,  (1)

b= 1.45 f+ 0.14.  (2)

2. The structure according to claim 1 , wherein

the radial thickness of the annular outer wall is 1.24 mm to 14.6 mm.

3. The structure according to claim 1 , wherein

the annular inner wall and the annular outer wall protrude from a reference surface, which is perpendicular to their respective axial directions, to the same direction,

the annular inner wall protrudes from the reference surface by 1.76 mm to 13.2 mm, and

the annular outer wall protrudes from the reference surface by 1.8 mm to 12.4 mm.

4. A structure for mounting a gasket on a block, comprising:

a block including:

a fluid channel, and

an annular wall made of resin and located radially outside an opening of the fluid channel; and

a gasket surrounding the opening of the fluid channel and having an axial side radially inside the annular wall,

wherein

the annular wall allows the axial side of the gasket to be press-fitted therein and is elastically deformable in its radial direction,

the annular wall has an inner diameter of 5 mm to 60 mm and a radial thickness of 1.24 mm to 14.6 mm, and

the inner diameter, a, of the annular wall and the radial thickness, b, of the annular wall fall within a range defined by the following equations (3) and (4):

b= 0.17 a+ 4.4,  (3)

b= 0.08 a+ 0.84.  (4)

5. The structure according to claim 4 , wherein the annular wall is made of a material with a modulus of elasticity of 200 MPa to 3200 MPa.

6. A structure for mounting a gasket on a block, comprising:

a block including:

a fluid channel, and

an annular wall made of resin and located radially outside an opening of the fluid channel; and

a gasket surrounding the opening of the fluid channel and having an axial side radially inside the annular wall,

wherein

the annular wall allows the axial side of the gasket to be press-fitted therein and is elastically deformable in its radial direction,

the annular wall has an inner diameter of 5 mm to 60 mm and an axial length of 1.8 mm to 12.4 mm, and

the inner diameter, a, of the annular wall and the axial length, c, of the annular wall fall within a range defined by the following equations (5) and (6):

c= 0.17 a+ 2.2,  (5)

c= 0.1 a+ 1.3.  (6)

7. The structure according to claim 6 , wherein the annular wall is made of a material with a modulus of elasticity of 200 MPa to 3200 MPa.

8. A structure for mounting a gasket on a block, comprising:

a block including:

a fluid channel, and

an annular wall made of resin and located radially outside an opening of the fluid channel; and

a gasket surrounding the opening of the fluid channel and having an axial side radially outside the annular wall,

wherein

at least a portion of the annular wall is press-fitted in the axial side of the gasket and is elastically deformable in its radial direction,

the annular wall has an inner diameter of 2 mm to 50 mm and a radial thickness of 0.72 mm to 6 mm, and

the inner diameter, e, of the annular wall and the radial thickness, f, of the annular wall fall within a range defined by the following equations (7) and (8):

f= 0.10 e+ 1.0,  (7)

f= 0.06 e+ 0.6.  (8)

9. The structure according to claim 8 , wherein the annular wall is made of a material with a modulus of elasticity of 200 MPa to 3200 MPa.

10. A structure for mounting a gasket on a block, comprising:

a block including:

a fluid channel, and

an annular wall made of resin and located radially outside an opening of the fluid channel; and

a gasket surrounding the opening of the fluid channel and having an axial side radially outside the annular wall,

wherein

at least a portion of the annular wall is press-fitted in the axial side of the gasket and is elastically deformable in its radial direction,

the annular wall has an inner diameter of 2 mm to 50 mm and an axial length of 1.76 mm to 13.2 mm, and

the inner diameter, e, of the annular wall and the axial length, g, of the annular wall fall within a range defined by the following equations (9) and (10):

g= 0.21 e+ 2.7,  (9)

g= 0.13 e+ 1.5.  (10)

11. The structure according to claim 10 , wherein the annular wall is made of a material with a modulus of elasticity of 200 MPa to 3200 MPa.