Hose with metal parts

Abstract

The flexible hose with a metal component comprises a hose 2, a metal component 3, and a sleeve 4. One end of the hose 2 is connected to the cylindrical portion 31 of the metal component 3. The sleeve 4 covers the hose 2 and the cylindrical portion 31. The sleeve 4 has a first cylindrical portion 41 covering the cylindrical portion 31 and a second cylindrical portion 42 covering the hose 2. The diameter of the second cylindrical portion 42 is smaller than that of the first cylindrical portion 41. The length of the second cylindrical portion 42 is 8 mm or more. The thickness of the second cylindrical portion 42 is 1 mm or more. The hardness of the second cylindrical portion 42, measured using a type A hardness tester according to JIS K6253, is 70 or more and 95 or less.

Description

Technical Field

[0001] The present invention relates to a hose with a metal component connected to it. Background Technology

[0002] In hoses used in vehicles such as motor vehicles or two-wheeled vehicles (e.g., brake hoses), hoses with metal fittings attached to their ends are used. Such hoses are required to be durable enough to withstand vibrations or bending within the vehicle.

[0003] Patent Document 1 describes a brake hose possessing the aforementioned durability. The brake hose described in Patent Document 1 has a metal part at its end, the metal part having a socket portion and a threaded sleeve portion concentrically formed on its inner side, with the hose inserted between the socket portion and the threaded sleeve portion. In the brake hose described in Patent Document 1, to avoid stress concentration near the end of the threaded sleeve portion when the hose is bent, the end of the threaded sleeve portion protrudes 3 to 7 mm further than the end of the socket portion.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent document 1: Japanese Patent Application Publication No. 2007-333112. Summary of the Invention

[0007] The problem that the invention aims to solve

[0008] In the brake hose described in Patent Document 1, the composition of the metal parts is changed, but it is also desirable to provide a different composition, such as a hose that is durable without changing the composition of the metal parts.

[0009] The object of the present invention is to provide a flexible hose with metal parts that has durability through a different configuration than in the past.

[0010] Solution for solving the problem

[0011] The flexible hose with a metal part disclosed in this specification comprises: a flexible hose; a metal part having a cylindrical portion of the metal part connected to one end of the aforementioned flexible hose; and a sleeve covering the aforementioned flexible hose and the aforementioned cylindrical portion of the metal part, the sleeve having: a first cylindrical portion covering the aforementioned cylindrical portion of the metal part; and a second cylindrical portion covering the aforementioned flexible hose and having a diameter smaller than the aforementioned first cylindrical portion, the length of the aforementioned second cylindrical portion being 8 mm or more, the thickness of the aforementioned second cylindrical portion being 1 mm or more, and the hardness of the aforementioned second cylindrical portion being 70 or more and 95 or less as measured by a type A hardness tester according to JIS K6253.

[0012] When vibration or bending occurs, stress concentrates near the connection between the hose and the metal component, making the hose prone to cracking in that area. It is known that covering the area near the connection between the hose and the metal component with a sleeve constructed as described above can suppress cracking in the hose.

[0013] By adopting the above-described configuration, it is possible to provide a hose that possesses durability through a different configuration than in the past.

[0014] In addition, it is possible to provide hoses with metal parts that do not change the composition of the metal parts, use existing metal parts, and are durable.

[0015] Based on the above configuration, for example, it possesses the anti-snagging properties required for brake hoses used in vehicles.

[0016] In one embodiment of the flexible tube with metal parts disclosed in this specification, the aforementioned second cylindrical portion may have: a cylindrical portion; and an inclined portion disposed between the aforementioned first cylindrical portion and the aforementioned cylindrical portion, the diameter of which decreases as it approaches the aforementioned cylindrical portion.

[0017] Based on the above configuration, an inclined portion exists at the point where stress is most likely to concentrate near the connection between the tubular portion of the metal component and the hose, thereby further suppressing cracking of the hose near the connection between the hose and the metal component. This improves the durability near the connection between the hose and the metal component, and thus further enhances the durability of the hose with the metal component.

[0018] In one embodiment of the hose with metal parts described above, the thickness of the aforementioned inclined portion may be greater than the thickness of the aforementioned first cylindrical portion.

[0019] Increasing the thickness of the inclined section, where stress is most likely to concentrate, improves the suppression of cracking in the hose near the connection between the hose and the metal component. This improves the durability near the connection between the hose and the metal component, thus further enhancing the durability of hoses with metal components.

[0020] In one embodiment of the aforementioned flexible tube with metal parts, the thickness of at least a portion of the aforementioned inclined portion may be greater than the thickness of the aforementioned cylindrical portion.

[0021] Increasing the thickness of the inclined section, where stress is most likely to concentrate, improves the suppression of cracking in the hose near the connection between the hose and the metal component. This improves the durability near the connection between the hose and the metal component, thus further enhancing the durability of hoses with metal components.

[0022] In one embodiment of the aforementioned flexible hose with metal parts, the inner side of the aforementioned flexible hose may be connected to the inner side of the aforementioned metal parts, the aforementioned first cylindrical portion may directly cover the aforementioned cylindrical portion of the metal parts, and the aforementioned second cylindrical portion may directly cover the aforementioned flexible hose.

[0023] In the above configuration, fluid flows through the portion where the inside of the hose communicates with the inside of the metal component. With this configuration, if cracks occur in the hose near the connection between the hose and the metal component, and these cracks propagate, there is a risk of fluid leakage from the cracked portion. However, near the connection between the hose and the metal component, the first cylindrical portion of the sleeve directly covers the cylindrical portion of the metal component, and the second cylindrical portion of the sleeve directly covers the hose, thereby suppressing cracks in the hose near the connection between the hose and the metal component, and thus eliminating the risk of fluid leakage.

[0024] In one embodiment of the above-described hose with metal parts, the sleeve may also be made of thermoplastic elastomer or rubber.

[0025] Even if the sleeve is made of readily available materials such as thermoplastic elastomers or rubber, it can improve the durability of hoses with metal parts.

[0026] In one embodiment of the aforementioned flexible hose with metal components, the hose may also have an inner surface resin layer, a metal wire reinforcement layer, and an outer surface resin layer in sequence from the inside.

[0027] Based on the above configuration, an inner surface resin layer that is difficult to corrode by the fluid flowing through the hose is formed as the innermost layer, and a metal wire reinforcement layer is formed on the outer side, thereby suppressing the expansion of the hose even when subjected to internal pressure generated by the fluid. In addition, by forming an outer surface resin layer on the outside of the metal wire reinforcement layer for protection, damage from the outside of the metal wire reinforcement layer can be suppressed.

[0028] In one embodiment of the aforementioned flexible hose with metal components, the hose may also have an inner surface resin layer, a metal wire reinforcement layer, and an outer surface resin layer in sequence from the inside, and the aforementioned inner surface resin layer is a single layer containing fluororesin.

[0029] By making the inner surface resin layer of the hose a single layer containing fluororesin, the heat resistance of the hose can be improved. On the other hand, when the hose has an inner surface resin layer, a metal wire reinforcement layer, and an outer surface resin layer in sequence from the inside, these layers are generally bonded together with an adhesive. When the inner surface resin layer is a single layer containing fluororesin, the adhesive does not bond to the fluororesin, resulting in weak adhesion between the inner surface resin layer and the metal wire reinforcement layer. Therefore, in the event of vibration or bending of the hose, misalignment can occur between the inner surface resin layer and the metal wire reinforcement layer, making it prone to cracking in either the metal wire reinforcement layer or the outer surface resin layer, potentially compromising durability. However, by covering the area near the connection between the hose and the metal component with the aforementioned sleeve, even when the inner surface resin layer of the hose is a single layer containing fluororesin, cracking of the hose under conditions of vibration or bending can be suppressed. Specifically, it can provide hoses with metal parts that have the high heat resistance and durability required for brake hoses for two-wheeled motor vehicles.

[0030] In one embodiment of the aforementioned flexible hose with metal parts, the hose may also have an inner surface resin layer, a metal wire reinforcement layer, and an outer surface resin layer in sequence from the inside, and the material of the sleeve is the same as that of the outer surface resin layer.

[0031] When the material of the sleeve is the same as that of the outer surface resin layer, the material properties are equal, suppressing the stress caused by the difference in material properties. Therefore, it is more difficult for the hose with metal parts to crack, which can further improve the durability.

[0032] In one embodiment of the aforementioned flexible hose with metal parts, the hose may also have an inner surface resin layer, a metal wire reinforcement layer, and an outer surface resin layer in sequence from the inside. The material of the sleeve is the same as that of the outer surface resin layer, and the materials of the sleeve and the outer surface resin layer are thermoplastic elastomers or rubber.

[0033] In addition to the effects mentioned above, the following effects can also be obtained.

[0034] The use of readily available materials in the sleeve and outer surface resin layer, which also makes it more difficult for hoses with metal parts to crack, further improves durability.

[0035] The effects of the invention

[0036] It can provide durable hoses with metal parts through a different construction than before. Attached Figure Description

[0037] Figure 1This is an external view of the hose with metal parts involved in the embodiment.

[0038] Figure 2 This is an external diagram showing the construction of the hose.

[0039] Figure 3 This is a diagram showing the internal structure of one end of a hose with a metal fitting.

[0040] Figure 4 It is a cross-sectional view of the area near the connection between the hose and the metal part. Detailed Implementation

[0041] Hereinafter, suitable embodiments of the present invention will be described.

[0042] exist Figure 1 The image shows a flexible hose 1 with metal fittings. The flexible hose 1 with metal fittings includes a hose 2, a metal fitting 3, and a sleeve 4. Metal fittings 3 are connected to both ends of the hose 2. The hose 2 is connected to the metal fittings 3 (see below). Figure 4 The area near the connection between the hose 2 and the metal part 3 is covered by the sleeve 4 (see below). Figure 3 The hose 1 with a metal component is used, for example, as a brake hose in a vehicle. Fluid flows in the portion of the hose 2 that connects to the metal component 3.

[0043] The hose 2 has multiple layers in sequence from the inside. Figure 2 The hose 2 shown has, in sequence from the inside, an inner surface resin layer 21, a metal wire reinforcing layer 22, and an outer surface resin layer 23.

[0044] The innermost layer of hose 2 can also be composed of a single layer containing fluororesin. Hose 2 can also have multiple layers sequentially from the inside out. In this case, the innermost layer of hose 2 can also be a layer containing fluororesin.

[0045] exist Figure 2 In the case of the hose 2 shown, the inner surface resin layer 21 may, for example, be composed of a single layer containing a fluororesin. Examples of fluororesins include at least one selected from the group consisting of polytetrafluoroethylene (PTFE), perfluoroalkoxyalkylene (PFA), and tetrafluoroethylene copolymer (FEP). One of these groups may be used, or a mixture of two or more may be used. In this case, the inner surface resin layer 21 may also contain components other than a fluororesin. Furthermore, as another example, in... Figure 2In the case of the hose 2 shown, the inner surface resin layer 21 may also be composed of multiple layers. For example, the inner surface resin layer 21 may also be composed of three layers in sequence from the inside: an inner layer, an intermediate layer, and an outer layer. In this case, the inner layer may be a layer containing a fluoropolymer (such as ethylene-tetrafluoroethylene copolymer (ETFE)), the intermediate layer may be a layer containing an adhesive polyamide resin (such as polyamide 12 (PA12)), and the outer layer may be a layer containing a gas-barrier polyamide resin (such as polyamide 11 (PA11)).

[0046] The metal wire reinforcement layer 22 is formed by braiding metal wires (fine metal wires). For example, stainless steel (SUS) wires may be used.

[0047] The outer surface resin layer 23 is a resin layer. Examples of resins include thermoplastic polyurethane (TPU) and polyamide resin (PA). The resin can also be a thermoplastic elastomer or rubber. Thermoplastic elastomers are not particularly limited. Examples of thermoplastic elastomers include olefin elastomers, styrene elastomers, vinyl chloride elastomers, urethane elastomers, ester elastomers, and amide elastomers. These elastomers can be used alone or in combination. Rubber is not particularly limited; examples include diene rubber, olefin rubber, acrylic rubber (ACM, ANM), butyl rubber (IIR), urethane rubber (U), silicone rubber (Q), and fluororubber (FFKM, FKM). These rubber components can be used alone or in combination.

[0048] exist Figure 3 The inner structure of the sleeve 4 is shown by dashed lines. The metal part 3 has a cylindrical portion 31 at its end. The metal part 3 is connected to the hose 2 by inserting the end of the hose 2 into the cylindrical portion 31. In this embodiment, a so-called tenon joint is shown as the metal part 3, but other metal parts may also be used.

[0049] The cylindrical metal part 31 and the hose 2 are covered by the sleeve 4. The sleeve 4 directly covers the cylindrical metal part 31 and the hose 2. Specifically, the sleeve 4 covers the vicinity of the connection between the cylindrical metal part 31 and the hose 2. The sleeve 4 may cover the entire cylindrical metal part 31 or only a portion of the cylindrical metal part 31. Regarding the hose 2, the sleeve 4 may also cover at least a portion of the hose 2.

[0050] exist Figure 4The diagram shows a partial cross-sectional view near the connection between the hose 2 and the metal part 3. The sleeve 4 has a first cylindrical portion 41 covering the cylindrical portion 31 of the metal part and a second cylindrical portion 42 covering the hose 2. The first cylindrical portion 41 directly covers the cylindrical portion 31 of the metal part. The first cylindrical portion 41 is mainly used to hold the sleeve 4 in the cylindrical portion 31 of the metal part. The second cylindrical portion 42 directly covers the hose 2. The diameter of the second cylindrical portion 42 is smaller than that of the first cylindrical portion 41. Here, "the diameter of the second cylindrical portion 42 is smaller than that of the first cylindrical portion 41" means that there is a portion of the second cylindrical portion 42 that satisfies any of the following: (1) a portion having an inner diameter smaller than that of the first cylindrical portion 41; (2) a portion having an outer diameter smaller than that of the first cylindrical portion 41; and (3) a portion having an inner diameter and an outer diameter smaller than both the inner and outer diameters of the first cylindrical portion 41.

[0051] The second cylindrical portion 42 has a cylindrical portion 51 and an inclined portion 52. The cylindrical portion 51 is a cylinder with a substantially constant inner and outer diameter. The inclined portion 52 is formed between the first cylindrical portion 41 and the cylindrical portion 51. The inclined portion 52 is the portion whose diameter decreases as it approaches the cylindrical portion 51. Here, "the diameter decreases as it approaches the cylindrical portion 51" means the portion whose inner and / or outer diameter decreases as it approaches the cylindrical portion 51.

[0052] The length l of the second cylindrical portion 42 Figure 4 The “l” shown is 8mm or more. With the sleeve 4 covering the hose 2 and the metal cylindrical part 31 (refer to...) Figure 4 The portion of the hose 2 not embedded in the metal cylindrical portion 31 is covered by the sleeve 4 for at least 8 mm from the end of the metal cylindrical portion 31. Furthermore, the upper limit of the length l of the second cylindrical portion 42 is not specifically limited. The upper limit of the length l of the second cylindrical portion 42 can be, for example, a length that does not overlap with a bushing (not shown) used to secure the hose 1 with the metal part to a vehicle, etc., and a length that does not overlap with the metal part 3 covering the other end of the hose 1 with the metal part and other sleeves 4 of the hose 2. Taking these into consideration, the length l of the second cylindrical portion 42 can be, for example, 50 mm or less. The upper limit of the length l of the second cylindrical portion 42 will not affect the durability effect described later.

[0053] The thickness of the second cylindrical portion 42 ( Figure 4 The “t” shown 11 The thickness of the second cylindrical portion 42 is 1 mm or more. The upper limit of the thickness of the second cylindrical portion 42 is not particularly limited. The upper limit of the thickness of the second cylindrical portion 42 will not affect the durability effect described later. For example, considering the installation space of the flexible hose 1 with metal parts, the thickness of the second cylindrical portion 42 can be 5 mm or less.

[0054] The thickness of the second cylindrical portion 42 ( Figure 4 The “t” shown 11“t” 12 The thickness of the inclined portion 52 can be uniform, or it can be partially uniform. For example, the thickness of the inclined portion 52 can be... 12 The thickness t of the cylindrical part 51 11 Similarly, at least a portion of the thickness t of the inclined portion 52 may also be [missing information]. 12 The thickness t of the cylindrical part 51 11 Different. For example, the thickness t of at least a portion of the inclined portion 52 12 It can also be compared to the thickness t of the cylindrical part 51 11 Thicker.

[0055] Additionally, the thickness of the second cylindrical portion 42 ( Figure 4 The “t” shown 11 “t” 12 The thickness t1 of the second cylindrical portion 42 can be the same as or different from that of the first cylindrical portion 41. For example, the thickness of the second cylindrical portion 42 can also be greater than the thickness t1 of the first cylindrical portion 41. The thickness t of the inclined portion 52 of the second cylindrical portion 42... 12 It can also be thicker than the thickness t1 of the first cylindrical part 41.

[0056] The hardness of the second cylindrical portion 42 is measured using a type A hardness tester according to JIS K6253, and is between 70 and 95. The hardness of the second cylindrical portion 42 may be the same as or different from that of the first cylindrical portion 41.

[0057] The length, thickness, and hardness of the first cylindrical portion 41 are not particularly limited. The length, thickness, and hardness of the first cylindrical portion 41 will not affect the durability described later.

[0058] The sleeve 4 is made of resin. The resin is not particularly limited; for example, it can be a thermoplastic elastomer or rubber. Thermoplastic elastomers are not particularly limited. Examples of thermoplastic elastomers include olefin elastomers, styrene elastomers, vinyl chloride elastomers, urethane elastomers, ester elastomers, and amide elastomers. These elastomers can be used alone or in combination. Rubber is not particularly limited; examples include diene rubber, olefin rubber, acrylic rubber (ACM, ANM), butyl rubber (IIR), urethane rubber (U), silicone rubber (Q), and fluororubber (FFKM, FKM). These rubber components can be used alone or in combination. The resin can also be, for example, thermoplastic polyurethane (TPU) or polyamide resin (PA).

[0059] When the hose 2 has multiple layers sequentially from the inside out, the material of the sleeve 7 can also be the same as the material of the outermost layer of the hose 2. In the hose 2... Figure 2In the configuration shown, the material of the sleeve 7 can also be the same as the material of the outer surface resin layer 23 of the hose 2.

[0060] The sleeve 4 covers the area near the connection between the hose 2 and the metal cylindrical portion 31, for example, when the hose 2 is connected to the metal cylindrical portion 31. The sleeve 4 can be bonded to the metal cylindrical portion 31 with adhesive, fixed with a band, or simply cover the metal cylindrical portion 31. A preferred configuration is one in which the sleeve 4 maintains its coverage of both the metal cylindrical portion 31 and the hose 2 even in environments where vibration or hose bending occurs. If the sleeve 4 maintains its coverage of both the metal cylindrical portion 31 and the hose 2, the inner diameter of the sleeve 4 may not be approximately the same as the outer diameter of the hose 2 or the outer diameter of the metal cylindrical portion 31.

[0061] Based on the above-described embodiment, the following effects can be obtained.

[0062] In the absence of a sleeve 4 in a hose with a metal component, stress concentrates near the connection between the hose 2 and the cylindrical metal component 31 when vibration or bending occurs, making the hose 2 prone to cracking. In this embodiment, the area near the connection between the hose 2 and the cylindrical metal component 31 is covered by the sleeve 4 configured as described above, thereby suppressing cracking in the hose 2 even under conditions of vibration or bending. According to this embodiment, a hose 1 with a metal component can be provided that uses existing metal components without changing their configuration, while also possessing durability. Specifically, as described later, it is known to have the anti-scratching properties required for a vehicle brake hose.

[0063] Additionally, in sleeve 4, such as Figure 4 As shown, an inclined portion 52 with a smaller diameter is formed. The inclined portion 52 is located at the point where stress is most likely to concentrate near the connection between the cylindrical portion 31 of the metal part and the hose 2, thereby further suppressing cracking of the hose 2 near the connection between the hose 2 and the metal part 3. This improves the durability near the connection between the hose 2 and the metal part 3, and thus further improves the durability of the hose 1 with the metal part.

[0064] Furthermore, by increasing the thickness t of the inclined portion 52 where stress is most easily concentrated... 12 The increased thickness improves the effect of suppressing cracking in the hose 2 near the connection between the hose 2 and the metal part 3. Therefore, the thickness t of the inclined portion 52 can also be increased. 12 It is thicker than the other parts of sleeve 4. For example, by making the thickness t of the inclined portion 52... 12 The thickness t1 is greater than that of the first cylindrical portion 41, which further improves durability. Additionally, by increasing the thickness t1 of at least a portion of the inclined portion 52... 12Thickness t of cylindrical part 51 11 Thicker, it can further improve durability.

[0065] Furthermore, the inner side of the hose 2 communicates with the inner side of the metal part 3. Fluid flows in the portion where the inner side of the hose 2 communicates with the inner side of the metal part 3. In this configuration, if cracks occur in the hose 2 near the connection between the hose 2 and the metal part 3, and the cracks propagate, there is a risk of fluid leakage from the cracked portion. However, near the connection between the hose 2 and the metal part 3, the first cylindrical portion 41 of the sleeve 4 directly covers the cylindrical portion 31 of the metal part 3, and the second cylindrical portion 42 of the sleeve 4 directly covers the hose 2, thereby suppressing cracks in the hose 2 near the connection between the hose 2 and the metal part 3, and thus eliminating the risk of fluid leakage.

[0066] The material of the sleeve 4 is not particularly limited. For example, by using readily available materials such as thermoplastic elastomers or rubber, the durability of the hose 1 with metal parts can be improved.

[0067] The composition of hose 2 is not particularly limited, and hose 2 may have multiple layers in sequence from the inside. When hose 2 has multiple layers in sequence from the inside, it is conceivable to use a corrosion-resistant material for the innermost layer that is in contact with the fluid, a damage-resistant material or composition for the outermost layer, or to add a layer using a material or composition that enhances the strength of the hose.

[0068] In addition, such as Figure 2 As shown, when the hose 2 has an inner surface resin layer 21, a metal wire reinforcement layer 22, and an outer surface resin layer 23 in sequence from the inside, the following effects can be obtained.

[0069] As the innermost layer, an inner surface resin layer 21 is formed that is difficult to corrode by the fluid flowing through the hose 2, while a metal wire reinforcement layer 22 is formed on the outer side, thereby suppressing the expansion of the hose 2 even under the internal pressure generated by the fluid. Furthermore, by forming an outer surface resin layer 23 on the outside of the metal wire reinforcement layer 22 for protection, damage from the outside of the metal wire reinforcement layer 22 can be suppressed. Alternatively, the hose 2 can also be a single layer.

[0070] In addition, in recent years, there has been a demand for improved heat resistance in brake hoses for two-wheeled motor vehicles. It is known that when hose 2 has multiple layers in sequence from the inside, the heat resistance of hose 2 can be improved by making the innermost layer of hose 2 a single layer containing fluoropolymer (e.g., PTFE).

[0071] Knowing that in hose 2 is Figure 2 In the configuration shown, by making the resin layer 21 on the inner surface of the hose 2 (refer to...) Figure 2The inner surface resin layer 21 is a single layer containing fluoropolymer (e.g., PTFE), which improves the heat resistance of the hose 2. On the other hand, the inner surface resin layer 21, the metal wire reinforcement layer 22, and the outer surface resin layer 23 are generally bonded together using an adhesive. However, since the inner surface resin layer 21 is a single layer containing fluoropolymer (e.g., PTFE), the adhesive does not bond to the fluoropolymer, resulting in weak adhesion between the inner surface resin layer 21 and the metal wire reinforcement layer 22. Therefore, in the event of vibration or bending of the hose 2, misalignment may occur between the inner surface resin layer 21 and the metal wire reinforcement layer 22, which can easily lead to cracking in either the metal wire reinforcement layer 22 or the outer surface resin layer 23, posing a risk of insufficient durability.

[0072] However, as described above, it is known that the connection between the flexible hose 2 and the cylindrical metal part 31 is covered by the sleeve 4 constructed as described above (see reference). Figure 4 Even when the inner surface resin layer 21 of the hose 2 is a single layer containing fluoropolymer (e.g., PTFE), cracking of the hose 2 can be suppressed under conditions of vibration or bending. Specifically, as described later, it is known to have the scrambling resistance required for a vehicle brake hose. Therefore, it is possible to provide a hose 1 with metal parts that has the high heat resistance and durability required for brake hoses for two-wheeled motor vehicles.

[0073] Furthermore, when the hose 2 has multiple layers sequentially from the inside, and the material of the sleeve 4 is the same as the material of the outermost layer of the hose 2, the material properties are identical, suppressing the generation of stress caused by differences in material properties. Therefore, it is more difficult for the hose 1 with metal parts to crack, further improving durability. When the material of the sleeve 4 is the same as the material of the outermost layer of the hose 2, and both the material of the sleeve 4 and the material of the outermost layer of the hose 2 are thermoplastic elastomers or rubber, readily available materials are used, and it is also more difficult for the hose 1 with metal parts to crack, further improving durability.

[0074] In hose 2 is Figure 2 In the configuration shown, when the material of the sleeve 4 is the same as the material of the resin layer 23 on the outer surface of the hose 2, the material properties are identical, suppressing the generation of stress caused by differences in material properties. Therefore, it is less likely for cracks to occur in the hose 1 with metal parts, further improving durability. In the hose 2, Figure 2 In the configuration shown, when the material of the sleeve 4 is the same as the material of the outer surface resin layer 23 of the hose 2, and the material of the sleeve 4 and the material of the outer surface resin layer 23 of the hose 2 are thermoplastic elastomers or rubber, the durability can be further improved by using readily available materials and making it more difficult for the hose 1 with metal parts to crack.

[0075] Example

[0076] The present invention will now be described in more detail through examples. However, the following examples do not limit the present invention.

[0077] Experiment 1

[0078] Use and Figures 1 to 4 The same type of hose with metal parts as shown was used to investigate durability through a stirring test.

[0079] As a hose, a hose is used that has an inner surface resin layer, a metal wire reinforcement layer, and an outer surface resin layer in sequence from the inside. The inner surface resin layer is a single layer of polytetrafluoroethylene (PTFE), the metal wire reinforcement layer is a stainless steel (SUS) wire reinforcement (braided) layer, and the outer surface resin layer is a thermoplastic polyurethane (TPU) layer.

[0080] The sleeve is made of thermoplastic polyurethane (TPU). The sleeve thickness is 1 mm, and the sleeve has a hardness of 70 (70A) as measured by a type A hardness tester according to JIS K6253.

[0081] As shown in Table 1, the length of the second cylindrical section of the prepared sleeve (refer to...) Figure 4 Four different types of hoses with metal fittings ("l") were tested. Each hose with metal fittings underwent a churning test according to JISD2601. Table 1 shows the time until hose failure.

[0082] [Table 1]

[0083]

[0084] The Japanese Industrial Standard JISD2601 specifies the agitation properties based on the agitation test. For vehicle brake hoses, it stipulates that the time until hose failure during the agitation test must be more than 35 hours.

[0085] As shown in Table 1, the time until hose failure is 35 hours or more when the length of the second cylindrical part of the sleeve is 8 mm or more.

[0086] Experiment 2

[0087] Four types of flexible tubes with metal parts were prepared, each with a second cylindrical section of the sleeve having a length of 8 mm and a thickness as shown in Table 2. Otherwise, a stirring test was conducted under the same conditions as in Experiment 1.

[0088] [Table 2]

[0089]

[0090] Table 2 shows that the time until hose failure is 35 hours or more when the thickness of the second cylindrical part of the sleeve is 1 mm or more.

[0091] Experiment 3

[0092] Five types of flexible hoses with metal parts were prepared, each with a second cylindrical section of the sleeve having a length of 8 mm and a hardness of the second cylindrical section as shown in Table 3. In addition, a stirring test was conducted under the same conditions as in Experiment 1.

[0093] [Table 3]

[0094]

[0095] The “60A”, “70A”, “75A”, “85A” and “95A” shown in Table 3 are as follows.

[0096] 60A: The hardness measured using a type A hardness tester according to JIS K6253 is 60.

[0097] 70A: The hardness measured using a type A hardness tester according to JIS K6253 is 70.

[0098] 75A: The hardness measured using a type A hardness tester according to JIS K6253 is 75.

[0099] 85A: The hardness measured using a type A hardness tester according to JIS K6253 is 85.

[0100] 95A: The hardness measured using a type A hardness tester according to JIS K6253 is 95.

[0101] As shown in Table 3, the time until hose failure is 35 hours or more. The hardness of the second cylindrical part of the sleeve is 70 or higher and 95 or lower, as measured by a Type A hardness tester according to JIS K6253.

[0102] As can be seen from the above experiments 1 to 3, a sleeve with a length of 8 mm or more, a thickness of 1 mm or more, and a hardness of 70 or more and 95 or less as measured by a type A hardness tester according to JIS K6253 can be used as a sleeve to obtain a flexible tube with metal parts that has the durability specified by JIS D2601.

[0103] Furthermore, in experiments 1 to 3 above, PTFE was used as the inner surface resin layer of the hose, which easily led to misalignment between the inner surface resin layer and the outer metal wire reinforcement layer. It is known that even when using such a hose, a hose with metal parts possessing the durability specified in JISD2601 can be obtained by using the aforementioned sleeve.

[0104] The embodiments of the present invention have been described above based on the accompanying drawings, but it should be understood that the specific configuration is not limited to these embodiments. Furthermore, the scope of the present invention is defined not by the foregoing description but by the claims, and includes all modifications within the meaning and scope equivalent to the claims.

[0105] For example, the composition of the hose is not limited to Figure 2 The three-layer structure shown—inner surface resin layer 21, metal wire reinforcement layer 22, and outer surface resin layer 23—can be changed. The composition of the inner surface resin layer 21 can also be changed.

[0106] Additionally, in the sleeve, such as Figure 4 As shown, there may be an inclined portion 52 between the first cylindrical portion 41 and the cylindrical portion 51, or there may be no inclined portion 52, and the first cylindrical portion 41 and the cylindrical portion 51 are continuous.

[0107] Explanation of reference numerals in the attached figures

[0108] 1. Hose with metal parts

[0109] 2 hoses

[0110] 21 Inner Surface Resin Layer

[0111] 22 Metal Wire Reinforcement Layer

[0112] 23 Outer surface resin layer

[0113] 3 metal parts

[0114] 4 sleeves

[0115] 41 1st cylindrical part

[0116] 42 2nd cylindrical part

[0117] 51 Cylindrical section

[0118] 52 Inclined section.

Claims

1. A flexible hose with a metal component, comprising: hose; A metal component having a cylindrical portion of metal connected to one end of the hose; and A sleeve that covers the hose and the cylindrical portion of the metal component. The inner side of the hose is connected to the inner side of the metal component. The hose, starting from the inner side, has an inner surface resin layer, a metal wire reinforcement layer, and an outer surface resin layer in sequence. The inner surface resin layer is a single layer containing fluororesin. The sleeve has: The first cylindrical portion directly covers the cylindrical portion of the metal component; and The second cylindrical portion directly covers the hose and has a smaller diameter than the first cylindrical portion. The length of the second cylindrical portion is 8 mm or more. The thickness of the second cylindrical portion is 1 mm or more. The hardness of the second cylindrical portion, measured using a type A hardness tester according to JIS K6253, is 70 to 95. The sleeve is made of thermoplastic elastomer or rubber. The sleeve is made of the same material as the outer surface resin layer. The second cylindrical portion has: cylindrical part; and An inclined portion is disposed between the first cylindrical portion and the cylindrical portion, and its diameter decreases as it approaches the cylindrical portion.

2. The flexible hose with a metal component according to claim 1, wherein, The thickness of the inclined portion is greater than the thickness of the first cylindrical portion.

3. The flexible hose with a metal component according to claim 1 or 2, wherein, At least a portion of the inclined portion is thicker than the cylindrical portion.

4. The flexible hose with a metal component according to claim 1 or 2, wherein, The sleeve and the outer surface resin layer are made of thermoplastic polyurethane.

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