CN1258578A - Cylinder jacket - Google Patents

Abstract

A cylinder liner, which is manufactured by casting the cylinder liner integrally assembled to the cylinder liner when casting the cylinder liner, and has casting molds on the outer peripheral surface and the inner peripheral surface of the axial middle part along the circumferential direction Parting part 3 through which surface A passes. The parting portion 3 on at least the above-mentioned outer peripheral surface of the cylinder liner 1 is formed in a convex shape. According to the present invention, it is not necessary to use a mold core when manufacturing the cylinder liner by casting, the manufacturing is easy, and the productivity can be improved.

Description

cylinder liner

The present invention relates to a cylinder liner used for a cylinder in an internal combustion engine and the like, and more particularly to a cylinder liner which can be easily manufactured by casting the cylinder liner.

Conventionally, when a cylinder liner used in an internal combustion engine or the like was manufactured by casting, a parting line 03 was provided along the axial direction of the cylinder liner 01 as shown in FIG. 6 shows only the split surface A of the lower mold), which is manufactured using the core 09. Moreover, the parting line 03 is located on an imaginary plane that divides the cylinder liner 01 into two parts in the axial direction.

Therefore, after casting, the mold 02 is disassembled at the position of the split plane A, and the cylinder liner 01 is taken out together with the core 09, and then the core 09 is crushed to obtain a casting of the cylinder liner 01 as a single piece (refer to the lower right of FIG. 6 ). .

However, the above-mentioned conventional cylinder liner 01 has a parting portion (parting line) 03 in the axial direction, and therefore, when the cylinder liner 01 is manufactured by casting, the core 09 is required. In addition, since casting burrs are generated along the parting portion 03, grinding must be carried out by moving the grinding wheel in a rectangular shape, and this burr removal operation is cumbersome, hindering the improvement of the productivity of the cylinder liner 01.

In addition, the projected area of the cylinder liner 01 in its radial direction (assuming that the outer radius of the cylinder liner 01 is r and the length is 1, then it is 2r×1) is usually larger than the projected area in the axial direction (πr ² ), so the simultaneous In the case of casting multiple cylinder liners 01 with multiple molds 02, the number of cylinder liners 01 to be obtained is small compared to the case where the cylinder liners 01 have a parting portion (parting line) 03 along the circumferential direction, which also hinders productivity improvement.

The object of the present invention is to provide a cylinder liner which can solve the above-mentioned problems existing in the existing cylinder liner 01. When the cylinder liner is manufactured by casting, no core is needed, the manufacture is easy, and the productivity can be improved.

The present invention relates to a cylinder liner capable of solving the above-mentioned problems. The cylinder liner according to the first aspect is characterized in that, when casting the cylinder bore, the cylinder liner integrally assembled to the cylinder bore is produced by casting. On the outer and inner peripheral surfaces of the axial middle part, there are parting parts along the circumferential direction through which the mold parting surface passes.

According to the above-mentioned first aspect, since the cylinder liner is constructed as described above, when the cylinder liner is produced by casting, a core is not required to form the inside of the cylinder liner. In this way, only the cylinder liner needs to be pulled out from the upper and lower casting molds at the position of the dividing surface of the casting mold to obtain its casting body.

In addition, when multiple cylinder liners are simultaneously cast from one mold, more cylinder liners can be cast compared to the prior art in which the cylinder liner has a parting portion in the axial direction, and the number of cylinder liners that can be increased from one mold can be increased. Number of castings (liners) obtained.

In addition, since the casting burr is formed along the parting portion provided in the circumferential direction, it can be easily ground off with a grinding wheel or the like, and the burr grinding operation is facilitated.

In this way, the manufacture of the cylinder liner becomes easy, and the productivity thereof can be improved.

In addition, in a second aspect of the present invention, in addition to the above-mentioned first aspect, the parting portion on at least the outer peripheral surface of the cylinder liner is formed in a convex shape.

In this way, after the parting part of the cylinder liner is integrally assembled to the cylinder liner by casting when casting the cylinder liner, the liner also has the function of an axial fixing part with respect to the cylinder liner, thus, by being integrated with the cylinder liner itself The positioning shape of the cylinder liner can be simplified.

In addition, in the third aspect of the present invention, on the basis of the above-mentioned second aspect, the above-mentioned cylinder is a multi-cylinder cylinder, and the convex shape of the parting part on the outer peripheral surface of the cylinder liner is partially formed along the direction perpendicular to the cylinder arrangement direction. be cut.

In this way, the interval between the barrels of the cylinder can be reduced, thereby making it possible to miniaturize machines and devices such as internal combustion engines using the cylinder.

Fig. 1 is a perspective view showing a process of manufacturing a cylinder liner according to an embodiment of the first to third aspects of the present invention by casting.

FIG. 2 is a partial longitudinal sectional view of a mold used in the casting of FIG. 1 .

Fig. 3 is a longitudinal sectional view showing a modified example of the cylinder liner of Fig. 1 after casting.

Fig. 4 is a longitudinal sectional view of a cylinder formed by integrally assembling the cylinder liner of Fig. 3 to a cylinder bore by casting.

Fig. 5 is a plan view of a modified example of the cylinder liner of Fig. 3 .

Fig. 6 is a perspective view showing a process of manufacturing a conventional cylinder liner by casting.

Next, an embodiment of the first to third aspects of the present application described in FIGS. 1 to 4 will be described.

Fig. 1 is a perspective view showing a process of casting a cylinder liner in this embodiment, Fig. 2 is a partial longitudinal sectional view of a mold used for casting in Fig. 1 , and Fig. 3 is a view showing deformation of the cylinder liner in Fig. 1 Fig. 4 is a longitudinal sectional view of a cylinder formed by integrally assembling the cylinder liner shown in Fig. 3 to the cylinder bore by casting.

In FIG. 1 , the cylinder liner 1 of this embodiment is used for a cylinder in an internal combustion engine, is made of cast iron, and is generally cylindrical in shape, by using a casting mold composed of a lower mold 2a and an upper mold 2b (not shown in the figure). 2 Simultaneously manufacture multiple (9).

The cylinder liner 1 has a parting portion 3 along the circumferential direction on the outer peripheral surface and the inner peripheral surface of the central portion in the axial direction, through which the dividing plane A of the mold 2 passes. The parting portion 3 is located on an imaginary plane that divides the cylinder liner 1 into two halves in the radial direction.

The parting portion 3 may be formed in a linear shape (parting line), or may be formed in a belt shape. In addition, the parting part 3 on the outer peripheral surface of the cylinder liner 1 may be formed in a band shape, and the parting part 3 on the inner peripheral surface may be formed in a line shape.

FIG. 1 shows a cylinder liner 1 in which parting portions 3 on both the outer peripheral surface and the inner peripheral surface of the cylinder liner 1 are formed in a linear shape. In addition, Fig. 3 shows the cylinder liner 1, in which the parting part 3 on the outer peripheral surface of the cylinder liner 1 is formed in a band shape, and the parting part 3 on the inner peripheral surface of the cylinder liner 1 is formed in a linear shape.

In the cylinder liner 1, at least the parting portion 3 on the outer peripheral surface thereof is convexly formed in a convex shape. In this embodiment, the convex shape is a taper from the parting part 3 to both ends of the cylinder liner 1 .

In the cylinder liner 1 shown in Fig. 1, the parting part 3 on the outer peripheral surface is formed in a convex shape, and the parting part 3 on the inner peripheral surface is also formed in a convex shape (refer to the cylinder liner 1 on the lower right in Fig. 1) . As a result, in the cylinder liner 1 , the axial central portion thereof is formed in a convex shape in both radially outward and inward directions, and has a thick-walled shape that bulges in both directions. In order to facilitate the extraction of the cylinder liner 1 from the mold 2, it is preferable to form a convex shape toward both sides in this way.

In contrast to this, in the cylinder liner 1 shown in FIG. 3 , only the strip-shaped parting portion 3 on the outer peripheral surface thereof is convexly formed in a convex shape. In the cylinder liner 1 , the circumferential surface from the band-shaped parting part 3 to both ends is also slightly tapered, so that the convex shape of the band-shaped parting part 3 is further increased (refer to the taper angle α in FIG. 3 ).

Corresponding to the above-mentioned shape of the cylinder liner 1 shown in FIG. 1, as shown in FIG. 1 and FIG. Formed at intervals, the bottomed V-shaped cross-sectional cylindrical recesses 4 have a gap that increases as they approach the dividing plane A. As shown in FIG.

The bottomed V-shaped cylindrical concave portion 4 of the mold 2 is deformed in various ways corresponding to the forming method of the parting portion 3 of the cylinder liner 1 . For example, in the case of the cylinder liner 1 shown in FIG. 3 , the inner peripheral surface 6 of the cylindrical recess 4 of the mold 2 is formed in a cylindrical shape with a slight draft, and the outer peripheral surface 7 is on the side of the dividing plane A. A short complete cylindrical portion is formed, and a frustoconical portion continued thereon by a reduced-diameter stepped portion is formed.

In this embodiment, the shapes of the cylinder liner 1, the parting portion 3 and the mold 2 can be considered in various ways as mentioned above, but no matter in which case, no core is needed when casting the cylinder liner 1, After casting, it is only necessary to pull out the cylinder liner 1 from the upper mold 2b and the lower mold 2a of the casting mold 2 to obtain its casting body. The cylinder liner 1 at the bottom right of Fig. 1 is the cast cylinder liner obtained in this way.

The cast cylinder liner 1 is transferred to the manufacturing process of the cylinder bore 5 (see FIG. 4 ) after deburring. A cylinder liner 1. Aluminum material is used for the cylinder bore 5 .

Cylinder 10 (refer to FIG. 4 ) constituted by the combination of cylinder liner 1 and cylinder bore 5 integrated with cylinder bore 5 in this way is then transferred to the machining process, where honing of hole 11 including the inner peripheral surface of cylinder liner 1 is performed. machining, chamfering, etc., to form the cylinder 10 .

As shown in Figure 4, the outer surface of the cylinder liner 1 is completely cast by the cylinder barrel 5, so the cylinder head side mating surface (the upper end surface of the cylinder barrel 5) 10a of the cylinder 10 is made of a single material, which is easy to process and maintains accuracy. Management is also easy.

The cylinder liner 1 integrally assembled to the cylinder bore 5 has a strip-shaped parting part 3 on its outer peripheral surface. As shown in FIG. By cutting away in a direction perpendicular to the direction in which the cylinders are arranged, the interval between the cylinders can be reduced, thereby enabling miniaturization of the internal combustion engine.

The cut-out portion may be formed in advance in the mold during casting, and in this case, the cutting process can be easily performed. In addition, cutting may be omitted in some cases. In FIG. 5 , FIG. 3 a shows such a cut-out portion, but the cut-out portion may also be formed along the entire circumference of the parting portion 3 .

Since the present embodiment is configured as described above, the following effects can also be obtained.

The cylinder liner 1 is made by casting, and has a parting part 3 on the outer peripheral surface and the inner peripheral surface of the axial middle part along the circumferential direction through which the mold parting surface passes.

As a result, when the cylinder liner 1 is produced by casting, the inside of the cylinder liner 1 is formed without a core. In this way, it is only necessary to pull out the cylinder liner 1 from the upper and lower casting molds 2b, 2a at the position of the dividing plane A of the casting mold 2, and the casting body can be obtained.

In addition, when a plurality of cylinder liners 1 are simultaneously cast from one mold 2, more cylinder liners 1 can be cast compared with the case where the cylinder liner 1 has a parting portion in the axial direction, thereby increasing the number of cylinder liners 1 from one mold 2. Number of castings (liner 1) obtained from mold 2.

In addition, since the casting burr is formed along the parting portion 3 provided in the circumferential direction, it can be easily ground off with a grinding wheel, and the deburring operation is easy.

In this way, the cylinder liner 1 can be easily manufactured, and its productivity can be improved.

The parting part 3 of at least the outer peripheral surface of the cylinder liner 1 is formed in a convex shape, so after the parting part 3 is integrally assembled to the cylinder bore 5 by casting when casting the cylinder bore 5, it is used as the cylinder liner 1 on the side of the cylinder bore 5. The axial fixation works. Thereby, the positioning shape of the cylinder liner 1 can be simplified by being integrated with the cylinder liner 1 itself, and the positioning structure of the cylinder liner 1 can be easily formed.

In addition, the cylinder 10 is a multi-cylinder cylinder, and the convex shape of the parting part 3 on the outer peripheral surface of the cylinder liner 1 is partially cut off in a direction perpendicular to the cylinder barrel arrangement direction (refer to 3a in Fig. 5), so the cylinder can be made The interval between cylinders becomes smaller, making the multi-cylinder internal combustion engine miniaturized.

In the present embodiment, the cylinder liner 1 is used for a cylinder in an internal combustion engine, but is not limited thereto, and may be used for a cylinder of various hydraulic and pneumatic machines and the like.

Claims (3)

1. A cylinder liner, characterized in that the cylinder liner, which is integrally assembled to the cylinder barrel by casting, is manufactured by casting. In the circumferential direction, there is a parting part through which the mold parting surface passes. 2. The cylinder liner according to claim 1, wherein at least the parting portion on the outer peripheral surface is formed in a convex shape. 3. The cylinder liner according to claim 2, wherein the cylinder is a multi-cylinder cylinder, and the convex shape of the parting portion on the outer peripheral surface is partially cut in a direction perpendicular to the direction in which the cylinders are arranged.

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