CN1144941C

CN1144941C - Air Cylinder for multicylinder internal combustion engine

Info

Publication number: CN1144941C
Application number: CNB991264851A
Authority: CN
Inventors: 加藤正; 孝明; 津久井孝明; 水村荣
Original assignee: Honda Motor Co Ltd
Current assignee: Honda Motor Co Ltd
Priority date: 1998-12-25
Filing date: 1999-12-23
Publication date: 2004-04-07
Anticipated expiration: 2019-12-23
Also published as: CN1258811A; JP4086985B2; JP2000192847A

Abstract

A cylinder with a multi-cylinder internal combustion engine, consists of a cylinder barrel 2 and a sleeve 3 integrally incorporated by casting when the cylinder barrel 2 is cast, and the sleeve 3 has a skirt part 3a protruding from a cylinder barrel main body part. The sleeve 3 is cast inserted into the cylinder barrel 2 at the time of casting including an outer peripheral face 3b and a lower end face 3c of the skit part 3a and an upper end face 3d on the opposite side to the skirt part 3a. The invention can improve the machining property of a mating face on the cylinder head side and facilitate the control such as maintenance of accuracy and deburring work in casting.

Description

The cylinder of multi-cylinder internal-combustion engine

Technical field

The application's invention relates to the cylinder of multi-cylinder internal-combustion engine, particularly relate to the processability of the first side engagement face of the cylinder of realizing cylinder improvement, make the cylinder of the multi-cylinder internal-combustion engine that the removal operation of the overlap in when casting becomes easily etc.

Background technique

In the prior art, as shown in Figure 3, in the cylinder 01 of multi-cylinder internal-combustion engine, what have is made of cylinder barrel 02 and the cylinder sleeve 03 that integrally embeds by casting when the aluminium die-cast of this cylinder barrel 02.

The first side of the cylinder of cylinder sleeve 03 upper-end surface 03d is exposed, and forms the first side engagement face of cylinder of cylinder 01 with the upper-end surface 02a of cylinder barrel 02.

In addition, among the cylinder sleeve 03, downside is projected in the unillustrated crankcase from the lower end surface 02b of cylinder barrel 02, forms skirt section 03a.The lower end surface 02b of cylinder barrel 02 forms the crankcase one side engagement face of cylinder 01.

At skirt section 03a from the outstanding downwards base end part of crankcase one side engagement face (lower end surface of cylinder barrel 02) 02b, as drawing better among Fig. 4, form lip portions 03e, the lower end surface 03f of this lip portions 03e, be retracted into from crankcase one side engagement face 02b top to figure, form recess 06 there around the annular around the base end part of skirt section 03a.

The cylinder 01 of the multi-cylinder internal-combustion engine of prior art, owing to constitute as previously mentioned, so the surface Machining of the first side engagement face of the cylinder of cylinder 01 (constituting) by the upper-end surface 03d of cylinder sleeve 03 and the upper-end surface 02a of cylinder barrel 02, processing when having become two kinds of different materials of the cylinder sleeve 03 that cylinder barrel 02 that the aluminium based material constitutes and ferrous material constitute.Therefore, the management of keeping precision etc. is a big problem.

In addition, surround at cylinder barrel 02 on the part of base end part of skirt section 03a of cylinder sleeve 03, when the aluminium die-cast, be easy to generate overlap, because this overlap also is difficult to ream when the machining of crankcase one side engagement face 02b, so as its countermeasure, as previously mentioned, on the base end part of skirt section 03a, form lip portions 03e, recess 06, make the axial elongation of this part of mold, push in the recess 06, so that do not produce overlap along cylinder sleeve 03.

The skirt section 03a of cylinder sleeve 03, though also have at Bao Zhuzhe (with reference to No. 844 communiques of the flat 8-144 of Japan Patent Publication Laid-Open) during die-cast on its total length at cylinder barrel 02, but in this structure, because the outer periderm Bao Zhu (casting ぐゐむ) of this skirt section 03a is only arranged, so when the bore and grind processing or the chamfer machining etc. of cylinder 01 (cylinder sleeve 03), can not ream the overlap that produces in its end, though this position is the position that there is no need to guarantee precision, but, then must implement extra processing only in order to remove this overlap.

Summary of the invention

The application's invention can solve the foregoing problem that cylinder had of the multi-cylinder internal-combustion engine of prior art, its purpose is to provide a kind of cylinder of multi-cylinder internal-combustion engine, this cylinder is made the mating face that is made of same material to the first side engagement face of the cylinder of cylinder, improve the processability of its surface Machining, easily keep the management of precision etc., can easily carry out the removal operation of overlap simultaneously.

The application's invention relates to the cylinder of the multi-cylinder internal-combustion engine that can solve foregoing problem, the cylinder of the multi-cylinder internal-combustion engine of its first scheme, has mating face with cylinder head, is made up of cylinder barrel and the cylinder sleeve that integrally embeds by casting when the casting of aforementioned cylinder barrel, aforementioned cylinder sleeve has the skirt section of giving prominence to from aforementioned cylinder barrel main part; It is characterized in that, aforementioned cylinder sleeve comprise the outer circumferential face in aforementioned skirt section and lower end surface and with the upper-end surface of aforementioned skirt section opposite side, Bao Zhu is in aforementioned cylinder barrel when aforementioned casting.

Invention described in first scheme owing to constitute as previously mentioned, so cylinder sleeve comprise the outer circumferential face in its skirt section and lower end surface and with the upper-end surface of this skirt section opposite side, Bao Zhu is in this cylinder barrel when the casting of cylinder barrel.

Its result, the first side engagement face of the cylinder of cylinder, owing to forming as the mating face that is made of same material, so can improve the processability of its surface Machining, the management of keeping the precision etc. on this mating face simultaneously becomes easy.

In addition, because overlap is along producing towards the radiation direction at the center of cylinder sleeve or along the inner peripheral surface of cylinder sleeve, so, its removal can ream when the bore and grind processing or the chamfer machining of cylinder, implement extra processing owing to there is no need to aim at the removal overlap, become easy so it removes operation.And, can realize the reduction of processing cost whereby.

And then, since the whole outer surface of cylinder sleeve all Bao Zhu in cylinder barrel,, can make its productivity raising so when the design cylinder sleeve, do not have upper and lower tropism's possibility that be designed to.

In addition, the invention described in alternative plan, cylinder sleeve forms with respect to the plane symmetry ground vertical with it on the basis of the invention of above-mentioned first scheme, becomes easily so it manufactures and designs, and can further improve its productivity.

Description of drawings

Fig. 1 is the partial, longitudinal cross-sectional of cylinder of an embodiment's inventing described in the application's first scheme and the alternative plan multi-cylinder internal-combustion engine.

Fig. 2 is the partial, longitudinal cross-sectional of the state after the casting just of expression cylinder.

Fig. 3 is the figure of expression prior art example.

Fig. 4 is the partial enlarged drawing of the A portion of prior art example.

Embodiment

Below, describe with regard to an embodiment who invents described in the application illustrated in figures 1 and 2 first scheme and the alternative plan.

Fig. 1 is the partial, longitudinal cross-sectional of the cylinder of the multi-cylinder internal-combustion engine in the present embodiment, and Fig. 2 is the partial, longitudinal cross-sectional of the state after the cylinder of presentation graphs 1 has just been cast.

In Fig. 1, the cylinder 1 of the multi-cylinder internal-combustion engine in the present embodiment is made up of cylinder barrel 2 and a plurality of cylinder sleeves 3 by cylinder number that integrally embed by casting when the casting of this cylinder barrel 2.Cylinder barrel 2 uses the aluminium based material, and cylinder sleeve 3 uses cast iron materials.

The upper-end surface of cylinder barrel 2 constitutes the mating face 2a with unillustrated cylinder head.In addition, the mating face 2b of the plat surface of cylinder barrel 2 belows formation and unillustrated crankcase.

Cylinder sleeve 3 has the outstanding skirt section 3a of below plat surface (with the mating face of crankcase) 2b from cylinder barrel 2 downwards.

(with the mating face of cylinder head) 2a from the upper-end surface of cylinder barrel 2 constitutes the main part of cylinder barrel 2 to the part of below plat surface (with the mating face of crankcase) 2b.Thereby the skirt section 3a of cylinder sleeve 3 is outstanding downwards from the main part of cylinder barrel 2.

When the casting of cylinder barrel 2, cylinder sleeve 3 is matched with the endoporus strut of aluminium die-cast metal pattern, wraps the casting casting.So, comprise the outer circumferential face 3b of its skirt section 3a and lower end surface 3c and with the upper-end surface 3d of skirt section 3a opposite side, all Bao Zhu is in cylinder barrel 2.Lower end surface 3c cuts from the outer circumferential face side direction inner peripheral surface side of cylinder sleeve 3, and is endowed curved shape as shown in Figure 2.

Cylinder 1 after the firm casting that obtains is like this then sent to machining, implements bore and grind processing, the chamfer machining etc. of endoporus portion of the cylinder 1 of the inner peripheral surface that comprises cylinder sleeve 3.

Though on the cylinder 1 after casting just, as shown in Figure 2, the lower end surface 2c that the cylinder of cylinder 1 first side engagement face 2a or cylinder barrel 2 form along the lower end surface 3c of the skirt section 3a by bag casting cylinder sleeve 3, produce overlap 4 along radiation direction towards the center of cylinder sleeve 3, in addition, upper end inner peripheral surface along cylinder sleeve 3 produces overlap 5, but the overlap on these

positions

4,5 can ream at one stroke by aforementioned processing and the chamfer machining of boring and grinding.In the occasion of the cylinder shown in Fig. 21, produce overlap 4 along lower end surface 2c.

Present embodiment is owing to constituting as described above, so can obtain following such effect.

Cylinder sleeve 3 comprise the outer circumferential face 3b of its skirt section 3a and lower end surface 3c and with the upper-end surface 3d of this skirt section 3a opposite side, Bao Zhu is in this cylinder barrel 2 when the casting of cylinder barrel 2.

Its result, the first side engagement face of the cylinder of cylinder 1 (upper-end surface of cylinder barrel 2) 2a, owing to forming as the mating face that is made of same material, so can improve the processability of its surface Machining, the management of keeping the precision etc. of this mating face 2a simultaneously becomes easy.

In addition,

overlap

4,5 is because along producing towards the radiation direction at the center of cylinder sleeve 3 or along the upper and lower end inner peripheral surface of cylinder sleeve 3, so its removal can ream when the bore and grind processing or the chamfer machining of the endoporus portion of cylinder 1, implement extra processing owing to there is no need to aim at the removal overlap, become easy so it removes operation.And, can realize the reduction of processing cost whereby.

And then, since the whole outer surface of cylinder sleeve 3 all Bao Zhu in cylinder barrel 2, so when design cylinder sleeve 3, the possibility that is designed to that does not have the upper and lower tropism, can make symmetry (with respect to the plane symmetry vertical) up and down to its first half and Lower Half, productivity is improved greatly with the axle of cylinder sleeve 3.

Moreover, when making this laterally zygomorphic cylinder sleeve 3, line that intersects at the outer circumferential face of plane that becomes laterally zygomorphic benchmark and cylinder sleeve 3 and inner peripheral surface or the belt-like zone that comprises this line, the joining portion that the parting plane of setting mold passes through, simultaneously this joining portion is formed convex, make by casting.

If use this manufacture method, then do not need core, compare with occasion along the axial setting mold joining portion of cylinder sleeve 3, can cast more cylinder sleeve simultaneously with a mold, can increase the output of the foundry goods (cylinder sleeve) that obtains from a mold.In addition, because overlap produces along the mold joining portion that along the circumferential direction is provided with,, it becomes easy so removing the overlap operation.Whereby, the manufacturing of cylinder sleeve becomes easily, can improve its productivity greatly.

Have again, because the casting of the outer circumferential face 3b of the skirt section 3a of cylinder sleeve 3 bag is in cylinder barrel 2, thus can on the entire axial length of cylinder 1, produce the casting residual stress of homogeneous substantially, whereby, the distortion homogenization in the time of can making the thermal expansion of cylinder 1.

Claims

1. the cylinder of a multi-cylinder internal-combustion engine has the mating face with cylinder head, is made up of cylinder barrel and the cylinder sleeve that integrally embeds by casting when the casting of aforementioned cylinder barrel;

Aforementioned cylinder sleeve has from the outstanding skirt section of aforementioned cylinder barrel main part;

It is characterized in that, aforementioned cylinder sleeve comprise the outer circumferential face in aforementioned skirt section and lower end surface and with the upper-end surface of aforementioned skirt section opposite side, Bao Zhu is in aforementioned cylinder barrel when aforementioned casting.

2. the cylinder of multi-cylinder internal-combustion engine as claimed in claim 1 is characterized in that, aforementioned cylinder sleeve forms with respect to the plane symmetry ground vertical with it.