JPH041453A - Cylinder liner - Google Patents

Abstract

PURPOSE:To secure such a highly powered engine cylinder liner that is able to cool an inner surface so efficiently by installing a cooling groove on each mating surface between both inner and outer cylinders, in the cylinder liner that composes a double cylinder consisting of these inner and outer cylinders. CONSTITUTION:In a cylinder liner consisting of an inner cylinder 1 and an outer cylinder 2, a spiral cooling groove 6 is installed in an upper part 26 of a mating surface of the outer cylinder 2. Cooling water is made to flow in as in an arrow 7 and to flow out as in an arrow 8. In addition, the cooling groove 6 is nearer to an inner surface 4 than an outer surface 5, and a flow velocity is also speedier so that cooling for the inner surface 4 becomes favorable. In this connection, the cooling groove 6 is installed in the outer cylinder 2, but it may be installed at the side of the inner cylinder 1. With this constitution, the inner surface 4 is made possible to be efficiently cooled in particular, thus such a cylinder liner that is optimum for a highly powered engine is offerable.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a high-cooling, high-strength composite cylinder liner for a diesel engine.

[Conventional technology]

Figure 4 is a longitudinal cross-sectional view of a conventional high-strength composite cylinder liner, in which an inner cylinder O1 made of cast iron with excellent lubricity and an outer cylinder O2 made of high-strength cast steel are HIP-jointed at their joint surface 03. Ta.

[Problem to be solved by the invention]

Since the inner surface 04 of the cylinder liner and the piston ring (not shown) are oil-lubricated sliding surfaces, it is necessary to avoid overheating the sliding surfaces to prevent scuffing. However, like the conventional cylinder liner, water cooling is performed from the outer surface 05, and in cylinder liners for high-output engines, the inner surface 04 is not sufficiently cooled.

SUMMARY OF THE INVENTION An object of the present invention is to provide a cylinder liner for a high-output engine that can solve the problems of the conventional apparatus, and in particular can efficiently cool the inner surface.

[Means to solve the problem]

The cylinder liner for high-output engines of the present invention is formed of an inner cylinder and an outer cylinder, and cooling grooves are provided on both joint surfaces 03. Cooling water is passed through the cooling grooves so as to particularly cool the inner surface of the cylinder liner. This is what I did.

[For production]

The joint surface 03 is closer to the inner surface 04 than the outer surface 05, and the passage area of the cooling water is small and the flow rate is high, so that the inner surface 04 is sufficiently cooled.

〔Example〕

A first embodiment of the present invention will be described below with reference to FIG.

FIG. 1 is a longitudinal sectional view of a high-strength composite cylinder liner.

The cylinder liner consists of an inner cylinder 1 and an outer cylinder 2, and a spiral cooling groove 6 is provided in the upper part 26 of the joint surface 3 of the outer cylinder 2, and the cooling water flows into L2 as shown by arrow 7 and flows out as shown by arrow 8. It is supposed to be done. Since the cooling grooves 6 are closer to the inner surface than the outer surface 5 and the flow velocity is faster, the inner surface 4 can be cooled well.

Although the spiral cooling grooves 6 are provided on the outer cylinder, they may also be provided on the inner cylinder 1 side.

In addition to HIP, the inner tube 1 and outer tube 2 may be joined by shrink fit.

Figures 2 and 3 show the second embodiment. Figure 2 is a vertical cross section of the cylinder liner near the top (as seen from This is a view from P arrow. Note that the upper part of the figure is the cylinder head 11.

The upper part of the outer cylinder side 2 of the joint surface 3 of the cylinder liner is in communication. The upper annular groove 9 is partitioned into four chambers each having two spiral grooves 16 by a partition metal fitting 14 to form a cooling water reversal chamber 13. On the other hand, in the lower ring 10, all of the spiral grooves 16 are partitioned by partition hardware 15, and an inlet chamber 18 and an outlet chamber 1 are separated.
7 are formed alternately. Further, the inlet chamber 18 communicates with the inlet hole 23, and the outlet chamber 17 communicates with the outlet hole 25 through the communication groove 24. Cooling water flows in from arrow 7, passes through arrow 19, arrow 20, arrow 21, and arrow 22, and flows out from arrow 8.

With the above configuration, the cylinder liner can be easily cooled to a predetermined temperature by the cooling water passing through the spiral groove 6, upper annular groove 9, and lower annular groove 10 on the inner surface of the cylinder liner.

In this second embodiment, the spiral groove 16, the upper annular groove 9, the lower annular groove 10, the communication groove 24, etc. are provided on the outer cylinder 2 side of the joint surface, but they may be provided on the inner cylinder 1 side.

〔Effect of the invention〕

Since the cylinder liner of the present invention has cooling grooves disposed on the joint surface between the inner cylinder and the outer cylinder, the inner surface can be cooled particularly efficiently, and a cylinder liner most suitable for high-output engines can be provided.

[Brief explanation of drawings]

1 to 3 are related to the present invention. FIG. 1 is a longitudinal sectional view of the first embodiment, FIG. 3 is a developed view of the outer cylinder side joint surface of the second embodiment, and FIG. 2 is a third embodiment. FIG. 4 is a vertical cross-sectional view of the conventional example. 1...Inner cylinder, 2...Outer cylinder, 3...Joint surface, 6...
- Cooling groove, 9... Upper annular groove, 10... Lower annular groove, 16... Spiral groove, 17... Outlet chamber, 18... Inlet chamber. Fig. 1 Fig. 2 Fig. O4 inner surface Fig. 4

Claims (2)

[Claims] (1) A cylinder liner constituted by a double cylinder consisting of an inner cylinder and an outer cylinder, which has cooling grooves on the joining surface of the two. (2) The cooling groove of claim 1 connects the upper annular groove (9) and the lower annular groove (10) with a plurality of spiral grooves (16), and the upper annular groove (9) (or the lower annular groove ( 10)) on the circumference to form a cooling water reversal chamber (13), and a lower annular groove (10).
) (or the upper annular groove (9)) is circumferentially partitioned to form a cooling water inlet chamber (18) and an outlet chamber (17).