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JP-7856891-B2 - Method for manufacturing a resin silencer and resin silencer

JP7856891B2JP 7856891 B2JP7856891 B2JP 7856891B2JP-7856891-B2

Inventors

  • 侯 剛
  • 栗林 延全
  • 梶 聡

Assignees

  • 横浜ゴム株式会社

Dates

Publication Date
20260512
Application Date
20220411

Claims (5)

  1. A method for manufacturing a resin silencer connected to the piping of an automobile air conditioner, An insertion-side component having an annular circumferential rib protruding from the outer surface of a cylindrical body, an insertion portion at one end of the body in the axial direction, and a pipe portion smaller in diameter than the body connected to the other end in the axial direction via an expanded pipe portion that widens toward the body, A cylindrical body has annular circumferential ribs protruding from its outer surface, and the other end of the body in the axial direction has a receiving portion into which the insertion part is inserted. A receiving part is connected to one end of the body in the axial direction via an expanded pipe section that widens toward the body, and both are molded by resin injection molding. The receiving portion has an annular groove into which the cylindrical insertion portion is inserted, and a cylindrical flow-stopping wall portion connected to the outer circumference of the annular groove at a distance from each other. A method for manufacturing a resin silencer, comprising: pressing the tip surface of the insertion part inserted into the annular groove against the bottom surface of the annular groove; bringing the outer surface of the insertion part into contact with the outer peripheral wall of the annular groove; leaving a gap between the inner surface of the insertion part and the inner peripheral wall of the annular groove to create a non-contact state; and rotating the insertion part and the receiving part relative to each other around their axis, thereby spin-welding the contact portion between the insertion part and the annular groove to join the body of the insertion part and the body of the receiving part to form an integrated cylindrical part.
  2. A method for manufacturing a resin silencer according to claim 1, wherein an axial rib extending in the axial direction is formed on the outer circumferential surface of the insertion-side component by resin injection molding, and an axial rib extending in the axial direction is formed on the outer circumferential surface of the receiving-side component by resin injection molding.
  3. A method for manufacturing a resin silencer according to claim 1 or 2, wherein an annular circumferential rib is formed on the inner circumferential surface of the body portion of the insertion-side component by resin injection molding, and an annular circumferential rib is formed on the inner circumferential surface of the body portion of the receiving-side component by resin injection molding.
  4. A method for manufacturing a resin silencer according to claim 3, wherein the circumferential ribs protruding from the outer circumferential surface and the circumferential ribs protruding from the inner circumferential surface of the body portion of the insertion-side component are arranged in an axially offset manner, and the circumferential ribs protruding from the outer circumferential surface and the circumferential ribs protruding from the inner circumferential surface of the body portion of the receiving-side component are arranged in an axially offset manner.
  5. A resin silencer that connects to the piping of an automobile air conditioner, A resin insert-side component has an annular circumferential rib protruding from the outer surface of a cylindrical body, with an insertion portion at one end of the body in the axial direction, and a pipe portion smaller in diameter than the body connected to the other end in the axial direction via an expanded pipe portion that widens toward the body. A cylindrical body has annular circumferential ribs protruding from its outer surface, and the other end of the body in the axial direction has a receiving portion into which the insertion portion is inserted. The receiving part is made of resin and has a pipe portion with a smaller diameter than the body connected to one end in the axial direction via an expanded pipe portion that widens toward the body. The insertion portion is inserted into the receiving portion and joined together, and the body of the insertion part and the body of the receiving part, which are integrated by this joining, form a cylindrical portion. A resin silencer having a cylindrical flow-stopping wall portion connected at a distance from the outer circumference of the joint between the insertion portion and the receiving portion, and a cylindrical flow-stopping wall portion connected at a distance from the inner circumference of the joint portion.

Description

This invention relates to a method for manufacturing a resin silencer connected to the piping of an automobile air conditioner, and to a resin silencer itself. Silencers are connected to the piping of automotive air conditioners to suppress noise caused by the flow of circulating refrigerant (see, for example, Patent Documents 1 and 2). The silencer is a cylindrical body with a larger diameter than the connected piping and is mainly made of metal. In recent years, with the trend towards lighter automobiles, there has been a demand for lighter piping as well. When replacing conventional metal silencers with resin ones for weight reduction, it is necessary to ensure sufficient pressure resistance against the internal pressure exerted by the circulating refrigerant. Furthermore, since silencers connect to smaller diameter pipes, the diameter needs to change from the large-diameter cylindrical section (body) to the connecting pipe. Depending on the degree of this change in diameter, excessive localized stress may occur in the silencer under internal pressure, making it difficult to ensure sufficient pressure resistance. Thickening the peripheral wall of the cylindrical silencer to ensure pressure resistance is detrimental to weight reduction. Therefore, there is room for improvement in manufacturing resin silencers that are lightweight yet possess sufficient pressure resistance against internal pressure. Japanese Patent Application Publication No. 11-6668Japanese Patent Publication No. 2000-205701 This is an explanatory diagram illustrating an embodiment of a silencer in a front view.This is an explanatory diagram illustrating the silencer shown in Figure 1 in a longitudinal cross-sectional view.This is an explanatory diagram illustrating a magnified view of the joint portion in Figure 2.This is an explanatory diagram illustrating the insertion-side component and the receiving-side component that make up the silencer shown in Figure 1, in a separated state and viewed from the front.Figure 4 is an explanatory diagram illustrating the insertion-side component and the receiving-side component in a longitudinal cross-sectional view.This is an explanatory diagram illustrating the state in which the insertion-side component and the receiving-side component are fitted together, as shown in Figure 5, in a longitudinal cross-sectional view.This is an explanatory diagram illustrating an enlarged view of the fitting portion in Figure 6.This is a cross-sectional view taken along line A-A in Figure 6.This is an explanatory diagram illustrating another embodiment of the silencer in a longitudinal cross-sectional view.This is an explanatory diagram illustrating another embodiment of the silencer in a front view.This is a cross-sectional view taken along line B-B in Figure 10.This is an explanatory diagram illustrating another embodiment of the silencer in a front view. The method for manufacturing a resin silencer and the resin silencer of the present invention will be described below based on the embodiments shown in the figures. The embodiment of the resin silencer 1 illustrated in Figures 1 to 3 has pipe sections 9 and 20, which are smaller in diameter than the body sections 3 and 12, connected to both axial ends of the cylindrical section (body section 3, 12) via expanded pipe sections 8 and 19, respectively. The piping of an automobile air conditioner is connected to the pipe sections 9 and 20, respectively. The refrigerant C used in the air conditioner circulates within the hollow silencer 1. The refrigerant C flows in from one pipe section 9 and out from the other pipe section 20. The dashed line CL in the figures indicates the axis of the silencer 1, passing through the center of the cross-sections of the body sections 3 and 12, the expanded pipe sections 8 and 19, and the pipe sections 9 and 20. The direction in which the axis CL extends is the axial direction. The silencer 1 is formed by joining and integrating a resin insertion-side component 2 and a resin receiving-side component 11, as illustrated in Figures 4 and 5. The insertion-side component 2 and the receiving-side component 11 are basically made of the same resin. Known injection-molded resins are used as the resins forming the insertion-side component 2 and the receiving-side component 11. For example, nylon resin (such as nylon 66), polypropylene, and ABS resin are used. This resin can also be reinforced by mixing in short fibers (e.g., glass fibers or carbon fibers) in a predetermined proportion (for example, 30% to 40% by mass per 100 parts by mass of resin). The size of the short fibers is, for example, approximately 0.001 mm to 1.0 mm in outer diameter and 0.01 mm to 10 mm in length. The insertion-side component 2 has a body portion 3, an expanded tube portion 8, and a pipe portion 9. The body portion 3 has an insertion portion 4 at one end in the axial direction (the lower end in the figure) and an expanded tube portion 8 at the other end in the axia