US-12618517-B2 - High-pressure gas tank

Abstract

A high-pressure gas tank includes: a tank body including a body portion and a dome portion disposed on one side of the body portion in the axial direction; a cap having a shaft portion extending from a central portion of the dome portion along the axial direction and a through-hole through which the gas flows through the shaft portion; and a protective member that includes a protective portion covering the dome portion around the cap and made of resin and a connecting portion integrated with the protective portion, having an annular shape or a tubular shape into which the shaft portion of the cap is inserted, and made of metal. The cap includes a first threaded portion on an outer periphery of the shaft portion, and the protective member includes a second threaded portion screwed to the first threaded portion on an inner periphery of the connecting portion.

Inventors

• Yuki FUJIE
• Takeshi Ishikawa

Assignees

• TOYOTA JIDOSHA KABUSHIKI KAISHA

Dates

Publication Date

20260505

Application Date

20241010

Priority Date

20240119

Claims (3)

1. 1 . A high-pressure gas tank, comprising: a tank body that is a cylindrical hollow container including a body portion and a dome portion disposed on one side of the body portion in an axial direction; a cap including a shaft portion extending along the axial direction from a central portion of the dome portion, a through-hole penetrating through the shaft portion to allow gas to be distributed through the shaft portion, and a first threaded portion at an outer periphery of the shaft portion; a protective member including a protective portion covering the dome portion around the cap and made of resin, a connecting portion made of metal, having an annular shape into which the shaft portion inserted, the connecting portion being integrated with the protective portion with an adhesive layer, and a diameter of the connecting portion being smaller than a diameter of the body portion, and a second threaded portion screwed to the first threaded portion at an inner periphery of the connecting portion; a spacer disposed under the first threaded portion and the second threaded portion between the tank body and the protective member, suppressing approach of the protective member to the dome portion; and a nut disposed on the protective member, the nut including a third threaded portion that is screwed to the first threaded portion, the third threaded portion being disposed on the protecting member on a side opposite to the spacer with respect to the connecting portion, suppressing movement of the protective member toward the one side and loosening.
2. 2 . The high-pressure gas tank according to claim 1 , further comprising a refractory layer disposed between the protective member and an outer surface of the dome portion, the refractory layer being a thermally insulating sheet.
3. 3 . The high-pressure gas tank according to claim 1 , wherein the protective portion comprises a side wall portion covering an outer periphery of the dome portion and a panel portion covering an opening of the side wall portion.

Description

CROSS-REFERENCE TO RELATED APPLICATION This application claims priority to Japanese Patent Application No. 2024-007047 filed on Jan. 19, 2024, incorporated herein by reference in its entirety. BACKGROUND 1. Technical Field The present specification relates to a high-pressure gas tank. 2. Description of Related Art As a high-pressure gas tank of this type, a fixing structure for a protective member that protects a tank from shock absorption is disclosed (Japanese Unexamined Patent Application Publication No. 2023-26058 (JP 2023-26058 A)). In the high-pressure gas tank, a fixing bracket provided in a protective member and made of metal is fixed to a cap of the tank with a plurality of bolts. SUMMARY However, according to the fixing structure, a fastening force of the bolts acts on the cap in a radial direction when the fixing bracket and the cap are fastened with the bolts. Since the cap is easily deformed due to a force in the radial direction, the cap may be deformed in accordance with a fastening force acting on the cap. The present specification provides a technology of suppressing a load on a tank when a protective member is fixed to the tank. The disclosure of the present specification is embodied in a high-pressure gas tank. The high-pressure gas tank includes: a tank body that includes a body portion and a dome portion disposed on one side of the body portion in an axial direction; a cap that includes a shaft portion extending along the axial direction from a central portion of the dome portion and a through-hole penetrating through the shaft portion to allow gas to be distributed through the shaft portion; and a protective member that includes a protective portion covering the dome portion around the cap and made of resin and a connecting portion integrated with the protective portion, having an annular shape or a tubular shape into which the shaft portion of the cap is inserted, and made of metal. The cap includes a first threaded portion at an outer periphery of the shaft portion, and the protective member includes a second threaded portion that is screwed to the first threaded portion at an inner periphery of the connecting portion. According to the high-pressure gas tank, the protective member can be fixed to the cap by screwing the second threaded portion provided at the connecting portion of the protective member to the first threaded portion provided at the shaft portion of the cap. Since a fastening force of these threaded portions acts on the cap in the axis direction, deformation of the cap is effectively suppressed. Moreover, according to the high-pressure gas tank, a fastening member such as a bolt is not required, and it is thus possible to easily, quickly, and accurately achieve fastening and fixing without requiring an additional member or equipment for the fastening and the fixing. 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 cross-sectional view showing a high-pressure gas tank; FIG. 2 is an enlarged cross-sectional view showing the vicinity of the dome portion of the high-pressure gas tank; FIG. 3A is a diagram illustrating an embodiment of an integrated configuration of a protective portion and a connecting portion in a protective member; FIG. 3B is a diagram illustrating another embodiment of an integrated configuration of a protective portion and a connecting portion in a protective member; FIG. 3C is a diagram illustrating still another embodiment of an integrated configuration of a protective portion and a connecting portion in a protective member; FIG. 4 is a view showing a fastening and fixing step of the protective member to the tank body; and FIG. 5 is a cross-sectional view illustrating a state in which a refractory layer covering a dome portion is fixed by a protective member. DETAILED DESCRIPTION OF EMBODIMENTS A tank body of a high-pressure gas tank disclosed herein includes a body portion and a dome portion disposed on one side of the body portion in an axial direction. A cap includes a shaft portion extending along the axial direction from a central portion of the dome portion, and a through hole through which gas can flow through the shaft portion. The protective member includes a resin protective portion covering the dome portion around the cap, and a metal connecting portion integrated with the protective portion and having an annular shape or a cylindrical shape into which the shaft portion of the cap is inserted. The cap includes a first threaded portion at an outer periphery of the shaft portion, and the protective member includes a second threaded portion that is screwed to the first threaded portion at an inner periphery of the connecting portion. In one embodiment of the high-pressure gas tank, the shaft portion may include a firs