JP2017211009A - Hydraulic piping hose, brake hose, and hose mouthpiece - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hydraulic piping hose capable of suppressing the narrowing of a flow path of a hydraulic fluid accompanied with clamping while keeping a mouthpiece in small size and suppressing the coming-off of a hose or the leakage of liquid, a brake hose, and a hose mouthpiece.SOLUTION: A hydraulic piping hose includes: a mouthpiece 3 which integrally has a nipple portion 31 formed with a flow path 310 of a hydraulic fluid, a cylindrical socket portion 32 formed on an outer periphery of the nipple portion 31, and a coupling portion 33 coupling the nipple portion 31 and the socket portion 32; and a hose body 2 clamped and fixed between the nipple portion 31 and the socket portion 32. The socket portion 32 has a chamfering portion 321 which is made by chamfering a corner portion on an inner peripheral side of the other end portion, and has an inner peripheral surface 321a inclined to a center axis of the socket portion 32. The length in an axial direction of the chamfering portion 321 is 1.5 mm or more, and an angle between the inner peripheral surface 321a of the chamfering portion 321 and the center axis of the socket portion 32 is 10°-30°.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a hydraulic pipe hose, a brake hose, and a hose fitting.

  2. Description of the Related Art Conventionally, for example, a brake hose that connects a brake caliper constituting a disc brake device of a vehicle and a master cylinder, transmits hydraulic pressure generated in the master cylinder by a driver's brake operation to the brake caliper, and operates the disc brake device. Widely used.

  The brake hose is composed of a tubular hose through which brake fluid is circulated, and fittings provided at both ends of the hose. The mouth fitting has a cylindrical socket and a nipple assembled inside the socket. The end of the hose is inserted between the socket and the nipple, and is fixed to the metal fitting by caulking the socket.

  By the way, in recent years, the anti-lock brake system that suppresses the locking of wheels during braking and the ESC (Electronic Stability Control) system that suppresses the side slip of a vehicle during turning increase the brake fluid's maximum hydraulic pressure. Therefore, there is a need for a brake hose that can withstand this maximum hydraulic pressure. In addition, for example, in heavy machinery such as crane trucks and excavators and hydraulic pipe hoses for machine tools, it may be necessary to withstand higher hydraulic pressure than brake hoses.

  Therefore, with hydraulic piping hoses such as brake hoses, the metal fittings must be firmly tightened (increase the pressure of the crimping) to prevent the hose from coming off or leaking even at high fluid pressures. Is desired. However, if caulking of the metal fitting is performed firmly, a phenomenon occurs in which the meat of the hose flows along with the caulking and the fluidized meat bulges toward the inner diameter side of the hose. Such a bulging portion is generally called “bulge”.

  In particular, in a small-sized fitting, the swaged position is close to the end of the fitting (the end on the extension side of the hose), so that a bulge is likely to occur. When a bulge is generated, the flow path of hydraulic fluid such as brake fluid is narrowed, and there is a risk that problems such as poor response of the brake may occur, and a countermeasure is desired.

  In Patent Document 1, the nipple portion has a first cylindrical portion (small diameter portion) formed in a predetermined range from the end portion on the hose insertion side, and an outer diameter larger than the outer diameter of the first cylindrical portion. A hydraulic piping hose configured with a second cylindrical portion (large diameter portion) is disclosed.

  In the hydraulic piping hose described in Patent Document 1, at least a part of the meat of the hose that has flowed by caulking is used for the space around the first cylindrical portion (the outer diameter of the first cylindrical portion is the second cylinder). The generation of a bulge is suppressed by absorbing it in a space formed by reducing the diameter of the part rather than the outer diameter of the part.

JP 2013-119892 A

  However, in the hydraulic piping hose described in Patent Document 1, the space for absorbing the fluid of the fluidized hose is formed inwardly of the hose, that is, in the direction in which pressure is applied by caulking. There is a possibility that a bulge may be generated because the effect cannot be sufficiently absorbed, and further improvement has been desired.

  Therefore, the present invention is a hydraulic pipe capable of suppressing the narrowing of the flow path of the hydraulic fluid accompanying caulking while keeping the fitting small and suppressing the hose disconnection and liquid leakage. An object is to provide a hose, a brake hose, and a hose fitting.

  In order to solve the above-described problems, the present invention provides a cylindrical nipple portion in which a flow path for hydraulic fluid is formed at the center, a cylindrical socket portion formed on the outer periphery of the nipple portion, and Fixing between the nipple part and the socket part by clamping the socket part from the outer peripheral side with a mouthpiece integrally having a connecting part connecting the nipple part and the socket part. A hose body, and the socket part has a caulking part that fixes the hose body between one end connected to the coupling part and the other end on the opposite side, The socket portion has a chamfered portion having a chamfered inner peripheral surface inclined with respect to a straight line parallel to the central axis of the socket portion at the other end portion. And the chamfered portion has an axial direction of the socket portion. And the angle between the inner peripheral surface of the chamfered portion and a straight line parallel to the central axis of the socket portion is 10 ° or more and 30 ° or less. Provide piping hoses.

  In order to solve the above-mentioned problems, the present invention provides a cylindrical nipple portion having a brake fluid passage formed at the center, and a cylindrical socket portion formed on the outer periphery of the nipple portion. And a fitting that integrally has a connecting part that connects the nipple part and the socket part, and by crimping the socket part from the outer peripheral side, the gap between the nipple part and the socket part. A hose body fixed to the socket, and the socket portion has a caulking portion that fixes the hose body between one end connected to the coupling portion and the other end on the opposite side. The socket portion is chamfered at the other end portion by chamfering a corner portion on the inner peripheral side of the other end portion and having an inner peripheral surface inclined with respect to a straight line parallel to the central axis of the socket portion. The chamfered portion has the socket. The length along the axial direction of the portion is 1.5 mm or more, and the angle formed by the inner peripheral surface of the chamfered portion and a straight line parallel to the central axis of the socket portion is 10 ° or more and 30 ° or less. Provide a brake hose.

  In addition, for the purpose of solving the above-described problems, the present invention provides a cylindrical nipple portion in which a flow path for hydraulic fluid is formed at the center, and a cylindrical socket portion formed on the outer periphery of the nipple portion. And a connecting portion that connects the nipple portion and the socket portion, and one end portion of the hose body through which the hydraulic fluid flows is accommodated between the nipple portion and the socket portion. An annular space is formed, and the socket portion is formed by chamfering a corner portion on the inner peripheral side of the end portion on the side opposite to the connecting portion, and a straight line parallel to the central axis of the socket portion. The chamfered portion has a length along the axial direction of the socket portion of 1.5 mm or more, and the chamfered portion has a chamfered portion with an inner peripheral surface inclined with respect to the inner peripheral surface of the chamfered portion. , Angle formed by a straight line parallel to the central axis of the socket part There is more than 10 ° 30 ° or less, to provide a hose outlet fittings.

  According to the present invention, a hydraulic pipe capable of suppressing the narrowing of the flow path of the hydraulic fluid accompanying caulking while keeping the fitting small and suppressing hose disconnection and liquid leakage. Hoses, brake hoses, and hose fittings.

It is sectional drawing which shows the brake hose as an example of the hose for hydraulic piping which concerns on embodiment of this invention. It is a figure which shows the structure of a metal fitting, (a) is a fractured sectional view of a metal fitting, (b) is the expanded sectional view which expanded the edge part of the metal fitting. It is an expanded sectional view showing one modification of a cap metal fitting.

[Embodiment]
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is a cross-sectional view showing a brake hose as an example of a hydraulic pipe hose.

  As shown in FIG. 1, the brake hose 1 includes a tubular hose body 2 and a pair of fittings 3 (hose fittings) provided at both ends of the hose body 2. In FIG. 1, only one end of the brake hose 1 is shown.

  One fitting 3 of the brake hose 1 is connected to, for example, a brake caliper, and the other fitting 3 is connected to, for example, a master cylinder. The brake hose 1 transmits the pressure generated in the master cylinder to the brake caliper using the brake fluid as the hydraulic fluid, and operates the brake device of the vehicle.

  The pair of fittings 3 provided at both ends of the hose body 2 may have the same shape or different shapes. In addition to the female type illustrated in FIG. 1, the fitting 3 may be a male type or a so-called glasses type in which one end is formed in a ring shape. Or the intermediate metal fitting which connects the hose bodies 2 may be sufficient.

(Description of hose body 2)
The hose body 2 is configured by laminating an inner rubber layer 21, a first reinforcing layer 22, an intermediate rubber layer 23, a second reinforcing layer 24, and an outer rubber layer 25 in this order from the inside. The first reinforcing layer 22 and the second reinforcing layer 24 are braided layers in which reinforcing fibers are knitted.

  Examples of materials for the inner rubber layer 21, the intermediate rubber layer 23, and the outer rubber layer 25 include ethylene propylene diene rubber (EPDM), chloroprene rubber (CR), natural rubber (NR), styrene butadiene rubber (SBR), and isobutylene rubber. (IIR), chlorosulfonated polyethylene rubber (CSM), acrylonitrile butadiene rubber (NBR), and the like can be used. Also, instead of rubber, polypropylene (PP), polyethylene (PE), polyethylene terephthalate (PET), ethylene vinyl alcohol polymer (EVOH), polyvinyl chloride (PVC), polystyrene (PS), polyurethane, tetrafluoroethylene, etc. A resin may be used.

  Examples of the fiber material of the first reinforcing layer 22 and the second reinforcing layer 24 include PET (polyester) fiber, polyethylene 2,6-naphthalate (PEN) fiber, polybutylene terephthalate fiber, polyacrylate fiber, vinylon fiber, and nylon. Fiber, Aramid fiber, Acrylic fiber, Polyacrylonitrile fiber, Polyethylene fiber, Polypropylene fiber, Polyvinyl chloride fiber, Polyurethane fiber, Polyoxymethylene fiber, Polytetrafluoroethylene fiber, Polyparaphenylenepenbisbisoxazole fiber, Polyimide fiber or Polyphenylene In addition to synthetic fibers such as sulfide fibers, chemical fibers such as rayon and novolac, or natural fibers such as cotton and hemp can be used.

(Description of fitting 3)
2A and 2B are diagrams showing the configuration of the fitting 3, wherein FIG. 2A is a broken sectional view of the fitting 3, and FIG. 2B is an enlarged cross-sectional view in which the end of the fitting 3 is enlarged.

  As shown in FIG. 1 and FIG. 2, the fitting 3 is formed on the outer periphery of the nipple portion 31, which is a cylindrical nipple portion 31 in which a brake fluid flow path 310 for operating a vehicle brake is formed in the center portion. The socket part 32, a connecting part 33 for connecting the nipple part 31 and the socket part 32, and a cylindrical head part 34 having a female screw 340 formed on the inner peripheral surface are integrally provided.

  Between the socket part 32 and the nipple part 31, the annular space 3a in which one end part of the hose body 2 is accommodated is formed, and the end part of the hose body 2 is inserted into the annular space 3a. The hose body 2 is fixed between the nipple portion 31 and the socket portion 32 by caulking the socket portion 32 from the outer peripheral side.

  The connecting part 33 has a flange part 331 protruding from the outer peripheral surface 32 b of the socket part 32 on the outer peripheral part thereof. In addition, a flow path 330 that communicates with the flow path 310 of the nipple portion 31 is formed at the center of the connecting portion 33. The flow path 330 is open inside the head portion 34.

  The socket part 32 is formed in a cylindrical shape having an inner diameter larger than the outer diameter of the nipple part 31. The inner peripheral surface 32 a of the socket portion 32 faces the outer peripheral surface 31 b of the nipple portion 31. An inner peripheral surface 31 a of the nipple portion 31 is formed as an inner wall of the flow path 310. Moreover, the socket part 32 and the nipple part 31 share the center axis, and are arrange | positioned coaxially. Between the socket part 32 and the nipple part 31, it opens to one side of the axial direction, The annular space 3a in which the one end part of the hose body 2 is inserted from this opening is formed. The other of the annular spaces 3 a in the axial direction (the side opposite to the insertion side of the hose body 2) is closed by the connecting portion 33.

  One end 31 c in the axial direction of the nipple portion 31 and one end 32 c in the axial direction of the socket portion 32 are connected to the connecting portion 33. Moreover, the clearance gap between the other end 31d of the nipple part 31 and the other end 32d of the socket part 32 which are the other side of this one end 31c and 32c forms the opening of the annular space 3a.

  2 illustrates the case where the position of the other end 31d of the nipple portion 31 and the position of the other end 32d of the socket portion 32 coincide with each other in the axial direction of the fitting 3. The positions of the other end 31d and the other end 32d may be slightly shifted (for example, about 1 mm) in the axial direction.

  The fitting 3 is manufactured by plastic processing, for example. As a material of the processing material used for manufacturing the cap 3, it is preferable to use carbon steel for cold heading or its equivalent to prevent embrittlement so as to be suitable for plastic working, particularly cold forging. . Moreover, it is desirable that this material has a drawing of 75% or more in the tensile test method of a metal material defined in JIS Z 2241. Furthermore, the hardness of the processing material is preferably Vickers hardness of 100 to 300 HV. Specifically, for example, SWCH6A of JIS standard (JIS G 3539) can be adopted.

  Moreover, the cap 3 may be plated. As the plating material, for example, tin, zinc, nickel, iron, chromate, various resin paints, or a composite material thereof can be used.

(Description of details of socket portion 32)
The socket part 32 has a caulking part 4 that fixes the hose body 2 between one end 32c and the other end 32d thereof.

  The caulking portion 4 is a portion in which a part of the socket portion 32 is pressed inward in the radial direction and plastically deformed, and has a protruding portion 4a protruding inward in the radial direction. The protruding portion 4 a presses the hose body 2 inward and sandwiches the hose body 2 with the nipple portion 31, thereby fixing the hose body 2 to the fitting 3. Moreover, the crimping part 4 has the flat part 4b pressed flat with the jig | tool at the time of caulking on the outer peripheral surface. Here, the socket part 32 at a position overlapping with the flat part 4b in the axial direction is referred to as a caulking part 4.

  In the present embodiment, a plurality of (here, two) caulking portions 4 are formed in the socket portion 32. Hereinafter, among the caulking portions 4, the one formed on the most other end 32 d side is referred to as a first caulking portion 41 and is formed between the first caulking portion 41 and one end 32 c of the socket portion 32. This is referred to as a second caulking portion 42.

  By forming the plurality of caulking portions 4 in the socket portion 32, the hose body 2 can be more firmly fixed to the fitting 3 and the hose body 2 can be prevented from coming off or leaking. However, it is necessary to extend the length of the socket portion 322 in the axial direction as the number of the caulking portions 4 is increased, which leads to an increase in the size of the fitting 3, and thus the caulking portion 4 formed in the socket portion 32. The number of is desirably 3 or less, more preferably 2 or less.

(Description of details of socket portion 32)
In the brake hose 1 according to the present embodiment, the socket portion 32 is formed by chamfering a corner portion on the inner peripheral side of the other end portion at the other end portion (the end portion opposite to the connecting portion 33). A chamfered portion 321 having an inner peripheral surface 321a inclined with respect to a straight line parallel to the central axis of the portion 32 is provided. Hereinafter, the socket part 32 on one end side of the chamfered part 321 is referred to as a main body part 322.

  The main body portion 322 has an inner diameter dimension d that is substantially the same over the entire length, and the inner peripheral surface 322a of the main body portion 322 and the inner peripheral surface 321a of the chamfered portion 321 are continuous. That is, the inner diameter dimension at the end of the chamfered part 321 on the one end 32 c side (main body part 322 side) is equal to the inner diameter dimension d of the main body part 322.

  The end portion of the chamfered portion 321 opposite to the main body portion 322 is the other end 32 d of the socket portion 32. The chamfered portion 321 is formed in a tapered shape that gradually increases in diameter from the one end 32c side to the other end 32d side. . In the present embodiment, the inner diameter d of the main body 322 is 10.7 mm.

  That is, the cylindrical space 35 formed between the virtual surface obtained by extending the inner peripheral surface 322 a of the main body 322 in the axial direction and the inner peripheral surface 321 a of the chamfered portion 321 is formed at the other end 32 d of the socket portion 32. Open in the direction. Thus, when the cap 3 is viewed from the other end 32d side of the socket portion 32, the viewer can visually recognize the entire circumference of the inner peripheral surface 321a of the chamfered portion 321. In order to facilitate the insertion of the hose body 2 into the annular space 3a, the inner diameter of the other end 32d of the chamfered portion 321 is desirably larger than the outer diameter of the hose body 2.

  By configuring in this way, at least a part of the meat of the hose body 2 that flows along with the caulking of the socket part 32 is an imaginary surface obtained by extending the inner peripheral surface 322a of the main body part 322 in the axial direction and a chamfered part 321. Is absorbed by a cylindrical space 35 formed between the inner circumferential surface 321a of the first and second inner surfaces 321a. That is, it becomes possible to release the meat of the hose body 2 in the space generated by forming the chamfered portion 321, and at least a part of the pressure applied to the hose body 2 can be released by caulking. become. As a result, it is possible to suppress the occurrence of a bulge in which a part of the hose body 2 protrudes inward. Further, even when a bulge is generated, the length of the protrusion can be reduced, and the bulge protrudes inward from the inner peripheral surface 31a of the nipple portion 31 to narrow the brake fluid flow path. It becomes possible to suppress defects.

  In the present embodiment, the chamfered portion 321 serves to facilitate the insertion of the end portion of the hose body 2 into the annular space 3a and to release the meat of the hose body 2 that flows along with the caulking of the socket portion 32 to the outside. It can also be said that it also serves to suppress the occurrence of bulges.

  In the present embodiment, the length L of the chamfered portion 321 along the axial direction of the socket portion 32 is 1.5 mm or more. This is because if the length L along the axial direction of the socket portion 32 is less than 1.5 mm, the effect of forming the chamfered portion 321 cannot be sufficiently exhibited.

  In the present embodiment, the angle θ formed by the inner peripheral surface 321a of the chamfered portion 321 and a straight line parallel to the central axis of the socket portion 32 is set to 10 ° to 30 °. This is because if the angle θ is less than 10 °, the effect of forming the chamfered portion 321 cannot be sufficiently exhibited. If the angle θ exceeds 30 °, the length L of the chamfered portion 321 is set to 1. This is because when the thickness is 5 mm or more, the thickness of the chamfered portion 321 is reduced, the mechanical strength of the chamfered portion 321 is lowered, and the mouthpiece 3 may be damaged.

In the present embodiment, since the angle θ is set to 10 ° or more, when the thickness of the socket portion 32 in a state where it is not chamfered (that is, the thickness of the main body portion 322) is t, the length L of the chamfered portion 321 is obtained. Is at least the following formula (1)
L ≦ t / tan θ (1)
It is necessary to satisfy the relationship. More specifically, in order to suppress the mechanical strength of the chamfered portion 321 from decreasing, it is desirable that the length L of the chamfered portion 321 is 4.0 mm or less.

  Since the chamfered portion 321 is thinner than the main body portion 322 and has a lower mechanical strength, the caulking portion 4 is preferably formed only on the main body portion 322. That is, it is desirable not to form the caulking portion 4 in the chamfered portion 321.

  Further, when the caulking portion 4 is formed between the chamfered portion 321 and the main body portion 322, a corner portion 323 (a connection portion between the chamfered portion 321 and the main body portion 322) between the chamfered portion 321 and the main body portion 322 is a hose body. There is a possibility that the hose body 2 may be damaged by biting into the hose 2. Therefore, it is not preferable to form the caulking portion 4 at a position overlapping the corner portion 323.

  Further, in the axial direction, if the other end 31d of the nipple portion 31 is positioned on the side of the connecting portion 33 with respect to the chamfered portion 321, the flesh of the hose body 2 that has flowed by caulking moves inward and the bulge is moved. It tends to occur. Therefore, it is desirable that the end portion (the other end 31 d) of the nipple portion 31 opposite to the connecting portion 33 protrudes on the opposite side of the connecting portion 33 from the end portion of the chamfered portion 321 on the connecting portion 33 side.

  From the viewpoint of suppressing the bulge, the position of the other end 31d of the nipple portion 31 in the axial direction may be a position protruding to the extending side of the hose body 2 from the position of the other end 32d of the socket portion 32. This is desirable. However, in this case, there is a possibility that the nipple portion 31 becomes long and the fitting 3 is increased in size. Therefore, from the viewpoint of keeping the fitting 3 small and suppressing the occurrence of bulges, the axial position of the end portion (the other end 31d) opposite to the connecting portion 33 of the nipple portion 31 is It can be said that it is desirable that the chamfered portion 321 is included in the position range where the chamfered portion 321 is formed (that is, the chamfered portion 321 is formed on the outer periphery of the other end 31d of the nipple portion 31). The position range where the chamfered portion 321 is formed here also includes the other end 32 d of the socket portion 32. That is, “the position in the axial direction of the end portion (the other end 31d) opposite to the connecting portion 33 of the nipple portion 31 is included in the position range in which the chamfered portion 321 is formed in the axial direction”. The case where the axial position of the other end 31d of the nipple portion 31 and the other end 32d of the socket portion 32 coincide is also included.

(Operation and effect of the embodiment)
As described above, in the present embodiment, the socket portion 32 is formed by chamfering the corner portion on the inner peripheral side of the other end 32d at the other end 32d, and in a straight line parallel to the central axis of the socket portion 32. The chamfered portion 321 has a chamfered portion 321 having an inclined inner peripheral surface 321a. The chamfered portion 321 has a length L of 1.5 mm or more along the axial direction of the socket portion 32, and the inner peripheral surface of the chamfered portion 321. An angle θ formed by 321a and a straight line parallel to the central axis of the socket portion 32 is 10 ° or more and 30 ° or less.

  By configuring in this way, at least a part of the meat of the hose body 2 that flows along with the caulking of the socket part 32 is an imaginary surface obtained by extending the inner peripheral surface 322a of the main body part 322 in the axial direction and a chamfered part 321. Since it is absorbed by the cylindrical space 35 formed between the inner peripheral surface 321a and the inner peripheral surface 321a, the occurrence of bulge can be suppressed. As a result, for example, even if caulking is performed so as to be able to withstand the pressure of the brake fluid exceeding 10 MPa, it is possible to avoid the brake fluid flow path from becoming narrow.

  In the brake hose 1, even when the caulking position is close to the end of the fitting 3 (end on the extension side of the hose body 2) or when the caulking pressure is large, the brake hose 1 flows with caulking. Since the meat of the hose body 2 is absorbed by the space 35, bulge is unlikely to occur. That is, according to the present embodiment, the fitting 3 is kept small, and the hose body 2 is prevented from coming off or leaking, while the hydraulic fluid flow path is narrowed due to caulking. It becomes possible.

  Moreover, in this Embodiment, the space 35 which absorbs the meat | flesh of the hose body 2 which flows with the crimping of the socket part 32 is made into the outer peripheral side rather than the hose body 2, ie, the opposite direction to the direction where pressure is applied by crimping. The meat of the hose body 2 is released to the outer peripheral side. Therefore, in this embodiment, the hose body 2 absorbs the meat 35 on the inner peripheral side, that is, on the same side as the direction in which pressure is applied by caulking, compared to the conventional technique. It is difficult for the meat of the body 2 to move inward, and the occurrence of bulges can be further suppressed.

(Modification)
As shown in FIG. 3, the corner portion 323 between the chamfered portion 321 and the main body portion 322 may be rounded so that the chamfered portion 321 and the main body portion 322 are connected by a curved inner peripheral surface 323a. . Thereby, the damage of the hose body 2 by the corner | angular part 323 can be suppressed.

(Summary of embodiment)
Next, the technical idea grasped from the embodiment described above will be described with reference to the reference numerals in the embodiment. However, the reference numerals and the like in the following description are not intended to limit the constituent elements in the claims to the members and the like specifically shown in the embodiments.

[1] A cylindrical nipple part (31) in which a flow path (310) for hydraulic fluid is formed in the center part, a cylindrical socket part (32) formed on the outer periphery of the nipple part (31), And a fitting (3) integrally having a connecting portion (33) for connecting the nipple portion (31) and the socket portion (32), and the socket portion (32) added from the outer peripheral side. The hose body (2) is fixed between the nipple portion (31) and the socket portion (32) by tightening, and the socket portion (32) is connected to the connecting portion (33). Between the one end (32c) made and the other end (32d) on the opposite side, there is a caulking part (4) that fixes the hose body (2), and the socket part (32) The other end is chamfered on the inner peripheral corner of the other end, and the socket A chamfered portion (321) having an inner peripheral surface (321a) inclined with respect to a straight line parallel to the central axis of the portion (32), and the chamfered portion (321) is an axis of the socket portion (32). The length along the direction is 1.5 mm or more, and the angle formed by the inner peripheral surface (321a) of the chamfered portion (321) and a straight line parallel to the central axis of the socket portion (32) is 10 A hose for hydraulic piping (1) that is at least 30 ° and at most 30 °.

[2] The caulking part (4) is formed in the socket part (32) closer to the connecting part (33) than the chamfered part (321). Hose (1).

[3] The end of the nipple portion (31) opposite to the connecting portion (33) is more than the end of the chamfered portion (321) on the connecting portion (33) side than the connecting portion (33). The hose (1) for hydraulic piping according to [1] or [2], which protrudes on the opposite side.

[4] The position in the axial direction of the end of the nipple part (31) opposite to the connecting part (33) is included in the position range in which the chamfered part (312) is formed in the axial direction. The hydraulic pipe hose (1) according to [3].

[5] A cylindrical nipple portion (31) in which a brake fluid flow path (310) is formed in the center, a cylindrical socket portion (32) formed on the outer periphery of the nipple portion (31), And a fitting (3) integrally having a connecting portion (33) for connecting the nipple portion (31) and the socket portion (32), and the socket portion (32) added from the outer peripheral side. The hose body (2) is fixed between the nipple portion (31) and the socket portion (32) by tightening, and the socket portion (32) is connected to the connecting portion (33). Between the one end (32c) made and the other end (32d) on the opposite side, there is a caulking part (4) that fixes the hose body (2), and the socket part (32) The other end is chamfered at the corner on the inner peripheral side of the other end, The chamfered portion (321) has a chamfered portion (321) having an inner peripheral surface (321a) inclined with respect to a straight line parallel to the central axis of the nut portion (32), and the chamfered portion (321) is the socket portion (32). The length along the axial direction is 1.5 mm or more, and the angle formed by the inner peripheral surface (321a) of the chamfered portion (321) and a straight line parallel to the central axis of the socket portion (32) is Brake hose (1) which is 10 ° or more and 30 ° or less.

[6] A cylindrical nipple portion (31) in which a hydraulic fluid flow path (310) is formed in the center, a cylindrical socket portion (32) formed on the outer periphery of the nipple portion (31), And a connecting portion (33) for connecting the nipple portion (31) and the socket portion (32) integrally, and between the nipple portion (31) and the socket portion (32), An annular space (3a) in which one end portion of the hose body (2) through which the hydraulic fluid flows is accommodated is formed, and the socket portion (32) is at an end portion opposite to the connection portion (33), A chamfered portion (321) having an inner peripheral surface (321a) inclined with respect to a straight line parallel to the central axis of the socket portion (32) is formed by chamfering a corner portion on the inner peripheral side of the end portion. The chamfered portion (321) is in the axial direction of the socket portion (32). And the angle between the inner peripheral surface (321a) of the chamfered portion (321) and a straight line parallel to the central axis of the socket portion (32) is 10 ° or more. Hose fitting (3) which is 30 ° or less.

  While the embodiments of the present invention have been described above, the embodiments described above do not limit the invention according to the claims. In addition, it should be noted that not all the combinations of features described in the embodiments are essential to the means for solving the problems of the invention.

  The present invention can be appropriately modified and implemented without departing from the spirit of the present invention.

  For example, the present invention is not limited to a brake hose, and can be applied to, for example, a vehicle power steering hose, a SUS mesh hose, an air conditioner hose, or a resin hose as a hydraulic pipe hose. Furthermore, it is used for heavy machinery such as crane trucks and shovel cars, machine tools, and the like, and can be applied to a hydraulic piping hose that circulates hydraulic fluid that operates an operation target device by hydraulic pressure.

1 ... Brake hose 2 ... Hose body 3 ... Mouth fitting (hose fitting)
3a ... annular space 4 ... caulking part 31 ... nipple part 310 ... flow path 32 ... socket part 32c ... one end 32d ... other end 321 ... chamfered part 321a ... inner peripheral surface 322 ... main body part 33 ... connecting part

Claims (6)

A cylindrical nipple portion in which a flow path for hydraulic fluid is formed in the center, a cylindrical socket portion formed on the outer periphery of the nipple portion, and a connection that connects the nipple portion and the socket portion A mouthpiece having an integral part,
A hose body fixed between the nipple part and the socket part by caulking the socket part from the outer peripheral side,
The socket portion has a caulking portion that fixes the hose body between one end connected to the coupling portion and the other end on the opposite side,
The socket portion is formed by chamfering a corner portion on the inner peripheral side of the other end portion at the other end portion, and a chamfer portion having an inner peripheral surface inclined with respect to a straight line parallel to the central axis of the socket portion. Have
The chamfered portion has a length along the axial direction of the socket portion of 1.5 mm or more,
The angle formed by the inner peripheral surface of the chamfered portion and a straight line parallel to the central axis of the socket portion is 10 ° or more and 30 ° or less.
Hose for hydraulic piping. The caulking part is formed in the socket part on the connecting part side with respect to the chamfered part,
The hose for hydraulic piping according to claim 1. The end portion of the nipple portion opposite to the connecting portion protrudes on the opposite side of the connecting portion from the end portion of the chamfered portion on the connecting portion side,
The hydraulic piping hose according to claim 1 or 2. The position in the axial direction of the end portion of the nipple portion opposite to the connecting portion is included in a position range in which the chamfered portion is formed in the axial direction.
The hydraulic piping hose according to claim 3. A cylindrical nipple portion having a brake fluid passage formed in the center, a cylindrical socket portion formed on the outer periphery of the nipple portion, and a connection connecting the nipple portion and the socket portion A mouthpiece having an integral part,
A hose body fixed between the nipple part and the socket part by caulking the socket part from the outer peripheral side,
The socket portion has a caulking portion that fixes the hose body between one end connected to the coupling portion and the other end on the opposite side,
The socket portion is formed by chamfering a corner portion on the inner peripheral side of the other end portion at the other end portion, and a chamfer portion having an inner peripheral surface inclined with respect to a straight line parallel to the central axis of the socket portion. Have
The chamfered portion has a length along the axial direction of the socket portion of 1.5 mm or more,
The angle formed by the inner peripheral surface of the chamfered portion and a straight line parallel to the central axis of the socket portion is 10 ° or more and 30 ° or less.
Brake hose. A cylindrical nipple portion in which a flow path for hydraulic fluid is formed in the center, a cylindrical socket portion formed on the outer periphery of the nipple portion, and a connection that connects the nipple portion and the socket portion Has an integral part,
Between the nipple portion and the socket portion, an annular space is formed in which one end portion of the hose body through which the hydraulic fluid flows is accommodated,
The socket portion is formed by chamfering a corner portion on the inner peripheral side of the end portion on the opposite side to the connection portion, and an inner periphery inclined with respect to a straight line parallel to the central axis of the socket portion. A chamfered portion having a surface;
The chamfered portion has a length along the axial direction of the socket portion of 1.5 mm or more,
The angle formed by the inner peripheral surface of the chamfered portion and a straight line parallel to the central axis of the socket portion is 10 ° or more and 30 ° or less.
Hose fittings.

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