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US-12618357-B2 - Cylinder block

US12618357B2US 12618357 B2US12618357 B2US 12618357B2US-12618357-B2

Abstract

The cylinder block includes a plurality of cylinder bores, a water jacket surrounding the plurality of cylinder bores, and a through channel that extends between adjacent cylinder bores and through which the coolant from the water jacket 30 flows. The through channel has a first upstream channel having an upstream end connected to the water jacket, a second upstream channel having an upstream end connected to the water jacket, and a downstream channel connected to a downstream end of the first upstream channel and a downstream end of the second upstream channel. The channel cross-sectional area of the downstream channel is larger than the channel cross-sectional area of the first upstream channel and is larger than the channel cross-sectional area of the second upstream channel.

Inventors

  • Yosuke Yamaguchi

Assignees

  • TOYOTA JIDOSHA KABUSHIKI KAISHA

Dates

Publication Date
20260505
Application Date
20250128
Priority Date
20240531

Claims (4)

  1. 1 . A cylinder block, comprising: a block body, in which are defined a plurality of cylinder bores, a water jacket surrounding a periphery of the cylinder bores, and a through channel that extends between the cylinder bores adjacent to each other and through which coolant from the water jacket flows, wherein the through channel includes a first upstream channel of which an upstream end is connected to the water jacket, a second upstream channel of which an upstream end is connected to the water jacket, and a downstream channel that is connected to a downstream end of the first upstream channel and a downstream end of the second upstream channel, a downstream-side portion of the first upstream channel, including the downstream end, extends in a columnar shape, a downstream-side portion of the second upstream channel, including the downstream end, extends in a columnar shape, an upstream-side portion of the downstream channel, including the upstream end, extends in a columnar shape, and a channel cross-sectional area of the upstream-side portion of the downstream channel is larger than a channel cross-sectional area of the downstream-side portion of the first upstream channel, and also is larger than the channel cross-sectional area of the downstream-side portion of the second upstream channel, wherein the downstream end of the downstream channel opens to a deck face, the first upstream channel is columnar, the downstream channel is columnar, and as viewed along an axis extending from the first upstream channel, the first upstream channel overlaps the downstream end of the downstream channel.
  2. 2 . The cylinder block according to claim 1 , wherein the channel cross-sectional area of the upstream-side portion of the downstream channel is larger than a total value of the channel cross-sectional area of the downstream-side portion of the first upstream channel and the channel cross-sectional area of the downstream-side portion of the second upstream channel.
  3. 3 . The cylinder block according to claim 1 , wherein, with respect to a width direction that is orthogonal to both of a boundary line that is a straight line connecting centers of the cylinder bores that are adjacent to each other as viewed from a direction along axes extending from the cylinder bores, and the axes extending from the cylinder bores, with a plane that includes the boundary line and is orthogonal to the width direction as a boundary plane, the downstream end of the first upstream channel and the downstream end of the second upstream channel are located on the same side as a downstream end of the downstream channel with respect to the boundary plane, and the upstream end of the downstream channel is located on the same side as the downstream end of the downstream channel with respect to the boundary plane.
  4. 4 . The cylinder block according to claim 1 , wherein, as viewed along the axis extending from the first upstream channel, an entire region of the first upstream channel is situated in a range of an outer edge of the downstream channel.

Description

CROSS-REFERENCE TO RELATED APPLICATION This application claims priority to Japanese Patent Application No. 2024-088628 filed on May 31, 2024, incorporated herein by reference in its entirety. BACKGROUND 1. Technical Field The present disclosure relates to a cylinder block. 2. Description of Related Art Japanese Unexamined Patent Application Publication No. 10-288080 (JP 10-288080 A) describes a cylinder block. In the cylinder block, a plurality of cylinder bores, a water jacket, and a drill path that is a through channel, are defined. The cylinder bores are arrayed in a row. The water jacket surrounds the cylinder bores. The through channel extends in a columnar shape. The through channel has a first upstream channel, a second upstream channel, a first downstream channel, and a second downstream channel. The first upstream channel and the first downstream channel are aligned on a straight line. The second upstream channel and the second downstream channel are aligned on a straight line. An upstream end of the first upstream channel is connected to the water jacket. A downstream end of the first upstream channel is connected to the first downstream channel and the second downstream channel. An upstream end of the second upstream channel is connected to the water jacket. A downstream end of the second upstream channel is connected to the first downstream channel and the second downstream channel. SUMMARY Now, in the cylinder block described in JP 10-288080 A, one downstream channel may be omitted. That is to say, the through channel may have the first upstream channel, the second upstream channel, and a downstream channel in which a lower end of the first upstream channel and a lower end of the second upstream channel are connected to each other. When one downstream channel is omitted in the cylinder block described in JP 10-288080 A, the channel cross-sectional area of the downstream channel is equal to the channel cross-sectional area of the first upstream channel or the second upstream channel. Accordingly, when coolant flows into the downstream channel from the first upstream channel and the second upstream channel, the flow rate of the coolant may decrease. To solve the above problem, the present disclosure is a cylinder block, including a block body, in which are defined a plurality of cylinder bores,a water jacket surrounding a periphery of the cylinder bores, anda through channel extending between the cylinder bores that are adjacent to each other and through which coolant from the water jacket flows, in which the through channel includes a first upstream channel of which an upstream end is connected to the water jacket, a second upstream channel of which an upstream end is connected to the water jacket, and a downstream channel that is connected to a downstream end of the first upstream channel and a downstream end of the second upstream channel,a downstream-side portion of the first upstream channel, including the downstream end, extends in a columnar shape,a downstream-side portion of the second upstream channel, including the downstream end, extends in a columnar shape,an upstream-side portion of the downstream channel, including the upstream end, extends in a columnar shape, anda channel cross-sectional area of the upstream-side portion of the downstream channel is larger than a channel cross-sectional area of the downstream-side portion of the first upstream channel, and also is larger than the channel cross-sectional area of the downstream-side portion of the second upstream channel. According to the above configuration, the channel cross-sectional area of the upstream-side portion of the downstream channel is larger than the channel cross-sectional area of the downstream-side portion of the first upstream channel, and also is larger than the channel cross-sectional area of the downstream-side portion of the second upstream channel. Accordingly, decrease in the flow rate of the coolant when the coolant flows into the downstream channel from the first upstream channel and the second upstream channel can be suppressed. BRIEF DESCRIPTION OF THE DRAWINGS Features, advantages, and technical and industrial significance of exemplary embodiments of the disclosure will be described below with reference to the accompanying drawings, in which like signs denote like elements, and wherein: FIG. 1 is a top view of a cylinder block of one embodiment; FIG. 2 is a cross-sectional view of the cylinder block taken along line 2-2 of FIG. 1; FIG. 3 is a cross-sectional view of a modified cylinder block; FIG. 4 is a cross-sectional view of a modified cylinder block; FIG. 5 is a cross-sectional view of a modified cylinder block; and FIG. 6 is a cross-sectional view of a modified cylinder block. DETAILED DESCRIPTION OF EMBODIMENTS An embodiment of a cylinder block will be described with reference to the drawings. Cylinder Block Overview As shown in FIG. 1, the cylinder block 10 includes a block body 11