JP2855926B2 - Internal combustion engine cylinder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylinder of an internal combustion engine, and more particularly, to a cylinder structure in which a cylinder is formed by mounting a cylinder liner on a block.

[0002]

2. Description of the Related Art Conventionally, as this kind of technology, for example, a technology disclosed in Japanese Utility Model Laid-Open Publication No. 51-46806 is known. According to this conventional technique, in a monoblock in which a cylinder head and a cylinder block are integrated, a cylinder is configured by inserting a cylinder sleeve (cylinder liner) into the cylinder hole from below, that is, from the crankcase side. ing. In this case, the cylinder liner is fixed by applying the plate to the base end of the cylinder liner and tightening the monoblock with a bolt. As shown in FIG. 10, a tapered surface 32 is formed on the inner periphery of the distal end portion of the cylinder liner 31, and a groove 34 having a corresponding tapered surface 33 is formed on the bottom peripheral edge of the cylinder hole 35. Then, in a state where the cylinder liner 31 is inserted into the cylinder hole 35 and assembled, the tapered surfaces 32 and 33 are abutted with each other, so that the tapered surfaces 32 and 33 are brought into close contact with each other by a so-called wedge action. Tip and cylinder hole 3
5 to ensure a gas sealing property.

[0003]

However, in the prior art, the rigidity of the cylinder liner 31 is generally high. Further, the outer peripheral surface 36 of the distal end portion of the cylinder liner 31 and the inner peripheral surface 37 of the groove 34, which are opposite to the abutting portion of the tapered surfaces 32, 33, are pressed against each other. For this reason, the abutment between the two tapered surfaces 32 and 33 is insufficient, and the wedge effect cannot be sufficiently exerted.
Moreover, since the processing accuracy of the tapered surfaces 32 and 33 as described above is generally not good, it is very difficult to secure the adhesion between the tapered surfaces 32 and 33. For this reason, in the prior art, the cylinder liner 3
It has been difficult to ensure a sufficient gas sealing property between the distal end of No. 1 and the cylinder hole 35. When the gas sealing property is reduced, the gas in the combustion chamber leaks into the crankcase to increase blow-by gas, or the pressure in the crankcase is increased to increase oil rise to the combustion chamber. There was a fear. In some cases, the gas in the combustion chamber may be mixed with the engine cooling refrigerant to reduce the cooling performance.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to assemble a cylinder liner by abutting a tapered surface on a cylinder liner tip end side with a tapered surface on a cylinder hole side. An object of the present invention is to provide a cylinder of an internal combustion engine that can improve the adhesion between both tapered surfaces.

[0005]

In order to achieve the above object, according to the present invention, there is provided a cylinder of an internal combustion engine having a cylinder liner inserted and assembled into a cylinder hole of a block constituting the internal combustion engine. Blocks
The tip of the cylinder liner inserted into the cylinder hole
And (b) the cylinder
The diameter of the liner is increased toward the tip on the inner peripheral surface of the tip.
With a tapered surface formed like
Having a structure that is more easily elastically deformed than the part of
(C) The groove corresponds to the tapered surface of the cylinder liner.
With another tapered surface formed in a butted manner
And between the outer peripheral surface of the tip of the cylinder liner.
Allow the cylinder liner to elastically deform in the outer circumferential direction
The point is to have clearance.

[0006]

According to the above arrangement, the blower constituting the internal combustion engine is provided.
Insert the cylinder liner into the cylinder hole of the
Is formed on the inner peripheral surface of the tip of the cylinder liner.
The taper surface and the seat into which the tip of the cylinder liner fits.
Abuts with another tapered surface formed in the groove of the binder hole
Is done. The tip of the cylinder liner is more elastic than other parts.
The structure is easy to deform
Clear the clearance between the groove and the outer peripheral surface of the tip of the cylinder liner.
Because of this arrangement,
The tip of the cylinder liner is elastically deformed in the outer circumferential direction
It becomes possible. As a result, it is formed at the tip of the cylinder liner.
Tapered surface and another tape formed in the groove of the cylinder hole
The wedge effect with the taper surface is fully exhibited,
Improves adhesion, and eventually the cylinder hole and cylinder line
Gas seal between the
You.

[0007]

【Example】

(First Embodiment) Hereinafter, a first embodiment of a cylinder of an internal combustion engine according to the present invention will be described in detail with reference to FIGS.

FIG. 1 is a sectional view showing a cylinder in the internal combustion engine of this embodiment. This cylinder is composed of a monoblock 1 in which a cylinder head and a cylinder block are integrated. The monoblock 1 has a plurality of cylinder holes 2 (only one cylinder is shown in the figure) formed therein and a skirt 3 extending below the cylinder hole 2. A space surrounded by a skirt 3 below each cylinder hole 2 is a crankcase 4. And in Monoblock 1,
A cylinder liner 5 is inserted into each of the cylinder holes 2 from below, that is, from the side of the crankcase 4, and is assembled.

The cylinder liner 5 has a substantially cylindrical shape, and a flange 5a is formed on the outer periphery on the base end side. Then, the cylinder liner 5 is fixed to the cylinder hole 2 by fastening the flange 5 a to the monoblock 1 with bolts 6. Such a cylinder liner 5
In the fixed state, the bottom side of the cylinder hole 2 forms the combustion chamber 7, and the inner periphery of the cylinder liner 5 is the cylinder bore 8.
It has become. At the upper center position of the monoblock 1, a plug hole 9 for mounting a spark plug is formed. In addition, an intake port and an exhaust port (not shown) are formed above the monoblock 1. In this embodiment, the monoblock 1 is made of aluminum for weight reduction, and the cylinder liner 5 is made of cast iron to ensure durability.

A continuous recess 10 is formed on the outer periphery of the cylinder liner 5, and a space between the recess 10 and the inner periphery of the cylinder hole 2 serves as a refrigerant passage 11 through which a coolant such as cooling water flows. I have. Also, a part of the monoblock 1 has an inlet 12 for communicating with the refrigerant passage 11 and introducing the refrigerant.
And an outlet 13 for taking out the refrigerant. Further, above and below the refrigerant passage 11, between the cylinder liner 5 and the cylinder hole 2, O-rings 14 for sealing the refrigerant are respectively assembled.

This cylinder is characterized by a structure in which the cylinder liner 5 is assembled. That is, as shown in FIGS. 1 and 2, a tapered surface 15 a is formed on the inner periphery of the liner tip 15 of the cylinder liner 5. A groove 16 having another tapered surface 16a corresponding to the tapered surface 15a is formed on the bottom peripheral edge of the cylinder hole 2. The butted portion of the two tapered surfaces 15a and 16a forms a gas seal portion 17 between the cylinder liner 5 and the cylinder hole 2. In this embodiment, the liner tip 15
Only the low elastic modulus is formed of another member. The liner tip 15 is joined and integrated with the main body of the cylinder liner 5. With this configuration, the liner tip 15 is formed to have lower elasticity than other portions of the cylinder liner 5. Further, a predetermined clearance 18 is provided between the groove 16 and the liner tip 15 on the opposite side of the abutting portion of the tapered surfaces 15a, 16a.

Next, the operation of the cylinder of the internal combustion engine configured as described above will be described. Well, Monoblock 1
In order to assemble and fix the cylinder liner 5, the cylinder liner 5 is first inserted into the cylinder hole 2 from the crankcase 4 side. During this assembly, the liner tip 15 is fitted into the groove 16 and
a and 16a are combined. Thereafter, when the flange 5a of the cylinder liner 5 is tightened to the monoblock 1 with the bolt 6, the cylinder liner 5 is fixed to the cylinder hole 2. At the time of this tightening, both tapered surfaces 15a and 16a abut each other.

In this embodiment, the liner tip 1
5 is formed of a member having low elasticity, and a clearance 18 that allows deformation of the liner tip 15 is provided on the opposite side of the abutting portion between both tapered surfaces 15a and 16a.

Accordingly, at the time of tightening, the pressing force of the liner allows the liner tip 15 to be elastically deformed to a certain extent by the allowance of the clearance 18. By this action, the two tapered surfaces 15a and 16a are satisfactorily butted. Also, the tapered surfaces 15a, 16a
Good match is achieved regardless of their processing accuracy. As a result, the wedge action on both tapered surfaces 15a and 16a can be sufficiently exerted to improve the adhesion between both tapered surfaces 15a and 16a.
5 and the gas sealing property between the cylinder hole 2 can be remarkably improved.

Further, during operation of the internal combustion engine, the cylinder hole 2 of the monoblock 1 is slightly deformed due to differences in heat and temperature distribution at that time. However, in the cylinder of this embodiment, since the liner tip 15 can be elastically deformed following the deformation in the groove 16, the gap between the two tapered surfaces 15 a and 16 a, that is, Adhesion can always be ensured.

As described above, in the cylinder of this embodiment, the gas sealing property between the liner tip 15 and the cylinder hole 2 can be improved and can always be ensured. It is possible to prevent gas from leaking into the refrigerant passage 11 and prevent gas from being mixed into the refrigerant. Therefore, the cooling performance of the internal combustion engine does not decrease due to gas leakage.

(Second Embodiment) Next, a second embodiment of a cylinder of an internal combustion engine according to the present invention will be described with reference to FIGS. In the configuration of each of the following embodiments including this embodiment, the same members as those of the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. Only different points will be described.

FIG. 3 is a sectional view showing a cylinder in the internal combustion engine of this embodiment, and FIG. 4 is an enlarged sectional view showing a main part thereof. In this embodiment, the cylinder liner 5
The configuration of the tip of the second embodiment is different from that of the first embodiment. That is, a tapered surface 21 a corresponding to the tapered surface 16 a of the groove 16 is formed on the inner periphery of the liner tip 21 shown by a mesh in FIGS. And both tapered surfaces 2
The butted portion of 1a and 16a forms a gas seal portion 17 between the cylinder liner 5 and the cylinder hole 2.
In this embodiment, only the liner tip 21 is annealed, and this configuration allows the liner tip 21 to be annealed.
Are formed with lower elasticity than other parts of the cylinder liner 5. Also, between the groove 16 and the liner tip 21 on the opposite side of the butted portion of the two tapered surfaces 21a and 16a,
A predetermined clearance 18 that allows deformation of the liner tip 21 is provided.

Therefore, when the cylinder liner 5 is tightened, the pressing force of the cylinder liner 5 allows the liner tip 21 to be elastically deformed to a certain extent by the allowance of the clearance 18, and the abutment of the two tapered surfaces 21a, 16a causes the abutment of the two tapered surfaces 21a, 16a. Performs well regardless of processing accuracy. As a result, the wedge action on both tapered surfaces 21a and 16a can be sufficiently exerted to improve the adhesion between both tapered surfaces 21a and 16a, and the gas between the liner tip 21 and the cylinder hole 2 can be improved. Sealability can be significantly improved.

Further, when the internal combustion engine is operating, the liner tip 21 can be elastically deformed following the deformation in the groove 16 caused by the difference in heat and temperature distribution at that time.
Adhesion at the gas seal portion 17 can always be ensured.

(Third Embodiment) Next, a third embodiment of a cylinder of an internal combustion engine according to the present invention will be described with reference to FIGS.

FIG. 5 is a sectional view showing a cylinder in the internal combustion engine of this embodiment, and FIG. 6 is an enlarged sectional view showing a main part thereof. In this embodiment, the cylinder liner 5
The configuration of the tip of the second embodiment is different from that of the first embodiment. That is, as shown in FIGS.
A tapered surface 22 a corresponding to the tapered surface 16 a of the groove 16 is formed on the inner circumference of the groove 2. Then, both tapered surfaces 22
The abutting portions of a and 16a form a gas seal portion 17 between the cylinder liner 5 and the cylinder hole 2. In this embodiment, only the liner tip 22 is formed to be thin, and the liner tip 22 is formed to have lower elasticity than other portions of the cylinder liner 5 by this configuration. A predetermined clearance 18 is provided between the groove 16 and the liner tip 22 opposite to the abutting portion of the tapered surfaces 22a and 16a.

Therefore, when the cylinder liner 5 is tightened, the pressing force of the cylinder liner 5 allows the liner tip 22 to be elastically deformed to a certain extent by the allowance of the clearance 18, and the abutment of the two tapered surfaces 22a, 16a causes the abutment of the two tapered surfaces 22a, 16a. Performs well regardless of processing accuracy. As a result, the wedge action on both tapered surfaces 22a and 16a can be sufficiently exerted to improve the adhesion between both tapered surfaces 22a and 16a, and the gas between the liner tip 22 and the cylinder hole 2 can be improved. Sealability can be significantly improved.

Also, when the internal combustion engine is operating, the liner tip 22 can be elastically deformed following the deformation in the groove 16 caused by the difference in heat and temperature distribution at that time.
Adhesion at the gas seal portion 17 can always be ensured.

It should be noted that the present invention is not limited to the above-described embodiments, but may be carried out as follows by appropriately changing a part of the configuration without departing from the spirit of the invention. (1) In each of the above embodiments, the liner tip portions 15, 21, and 2
7, the tapered surfaces 15a, 21a, 22a of the second and the tapered surface 16a of the groove 16 are directly butted.
As shown in FIGS. 8 and 9, the tapered surfaces 15a, 21a and 22a of the liner tips 15, 21 and 22 and the tapered surface 1 of the groove 16 are formed.
6a may be abutted with a metal gasket 23 interposed therebetween. In this case, gasket 2
3, the liner tips 15, 2
The gas sealing performance between the first and second and the cylinder hole 2 can be further remarkably improved.

(2) In each of the above embodiments, the monoblock 1 in which the cylinder head and the cylinder block are integrated
However, the present invention can also be embodied as one in which a cylinder head and a cylinder block are assembled.

[0027]

As described above in detail, according to the present invention, the distal end of the cylinder liner has a structure which is easily elastically deformed.
Clearer that allows elastic deformation in the outer circumferential direction
Of the cylinder liner.
Tapered surface and another tape formed in the groove of the cylinder hole
The wedge effect with the tapered surface is fully exhibited, and the tapered surfaces are in close contact
Performance and, consequently, the cylinder hole and cylinder liner.
The gas-sealing property between the two is reliably ensured.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a cylinder of an internal combustion engine according to a first embodiment of the present invention.

FIG. 2 is an enlarged sectional view showing a main part of FIG. 1 in the first embodiment.

FIG. 3 is a sectional view showing a cylinder of an internal combustion engine according to a second embodiment of the present invention;

FIG. 4 is an enlarged sectional view showing a main part of FIG. 3 in a second embodiment.

FIG. 5 is a sectional view showing a cylinder of an internal combustion engine according to a third embodiment of the present invention.

FIG. 6 is an enlarged sectional view showing a main part of FIG. 5 in a third embodiment.

FIG. 7 is a sectional view showing a cylinder of an internal combustion engine according to another embodiment of the present invention.

FIG. 8 is a sectional view showing a cylinder of an internal combustion engine according to another embodiment of the present invention.

FIG. 9 is a sectional view showing a cylinder of an internal combustion engine according to another embodiment of the present invention.

FIG. 10 is a sectional view showing a main part of a conventional cylinder structure.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Monoblock, 2 ... Cylinder hole, 5 ... Cylinder liner, 15, 21, 22 ... Liner tip part, 15a, 21
a, 22a: tapered surface, 16: groove, 16a: tapered surface,
17 ... gas seal part, 18 ... clearance, 23 ... gasket.

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-56-151237 (JP, A) JP-A-54-1287 (JP, Y2) JP-A-48-25475 (JP, Y1) Patent 115820 (JP, A C2) (58) Field surveyed (Int. Cl. ⁶ , DB name) F16J 1/00-10/04 F02F 1/00-1/42

Claims (1)

(57) [Claims] 1. A cylinder of a block constituting an internal combustion engine
Internal combustion engine with cylinder liner inserted and assembled
In the cylinder, which is inserted into (a) the block bore for the cylinder sheet
Having a groove into which the tip of the liner liner is fitted; and
Beauty (b) the cylinder liner tip on the inner peripheral surface of the distal end
Having a tapered surface formed in such a manner that the diameter increases toward the side
In both cases, the tip is more easily elastically deformed than other parts
And (c) the groove corresponds to a tapered surface of the cylinder liner.
With another tapered surface formed in a butted manner
And between the outer peripheral surface of the tip of the cylinder liner.
Allow the cylinder liner to elastically deform in the outer circumferential direction
A series of internal combustion engines characterized by having a clearance.
Darinah.