JP4293769B2 - Brake pipe and fittings - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a brake pipe and a fitting used as a joint for a brake hose.
[0002]
[Prior art]
Generally, in a piping system for a hydraulic brake device of an automobile, a flare pipe with a nut connected to a caliper and a fitting that is inserted and fixed to one end of a rubber hose are fastened. A nut of the flare pipe is fastened to a screw hole provided in the fitting. And connect.
[0003]
Such conventional brake pipes and fittings include a hose fitting 14 for connecting the brake pipe 10 and the rubber hose 12 in the hydraulic brake device for an automobile illustrated in FIG.
[0004]
The hose fitting 14 is composed of two parts, an outer cylinder 16 and an inner cylinder (nipple) 18. The outer cylinder 16 is a cylindrical body in which a flange 20 is formed on the outer periphery of an intermediate portion. A rubber hose crimping portion 22 is formed on one side of the flange 20 and a screw connection portion 24 is formed on the other side.
[0005]
The rubber hose crimping portion 22 has a thin-walled cylindrical shape, and the end portion of the rubber hose 12 is inserted into the inner cylinder 18 and crimped so as not to come off. In addition, the screw connection portion 24 has a thread groove cut in the inner wall, and the flare nut 28 is screwed together. The inside of the rubber hose crimping portion 22 and the inside of the screw connection portion 24 are separated by a partition wall 30 and communicated with each other through a through hole 32 formed in the central portion of the partition wall 30.
[0006]
The inner cylinder 18 is inserted and fixed in the through hole 32. The inner cylinder 18 is a steel pipe having a frustoconical sheet portion 34 formed at one end, and a flare portion 36 formed by expanding the distal end of the brake pipe 10 so as to expand toward the end. It is fixed and connected in a pressure contact state to constitute a flare pipe joint (see, for example, Patent Document 1).
[0007]
[Patent Document 1]
JP-A-7-27271 [0008]
[Problems to be solved by the invention]
The conventional hose fitting 14 as described above has a structure in which the brake pipe 10 and the rubber hose 12 cannot be directly connected. Therefore, in order to connect the brake pipe 10 and the rubber hose 12, it is necessary to use a combination of the hose fitting 14 formed by integrating two parts of the outer cylinder 16 and the inner cylinder 18 and the flare nut 28. There is.
[0009]
For this reason, in this connection structure, the brake pipe 10, the rubber hose 12, the outer cylinder 16, the inner cylinder 18, and the flare nut 28 are used in total, and there are a large number of parts and the structure. It becomes complicated, it takes time to process and assemble each part, and the product becomes expensive.
[0010]
Further, in this connection structure, in order to prevent oil leakage, management of a seal for maintaining airtightness between the rubber hose 12 and the inner cylinder 18 and a seal for maintaining airtightness between the seat portion 34 and the flare portion 36 are provided. Two airtight guarantees must be managed together with the above management.
[0011]
In particular, if the surfaces of the sheet portion 34 and the flare portion 36 that are in pressure contact with each other are damaged, liquid leakage may occur. For this reason, the sheet part 34 and the flare part 36 are required to have high quality and high accuracy, and about half of the processing cost of the hose fitting is this processing cost, which is the cause of the high manufacturing cost. It has become. Furthermore, the management of the airtightness guarantee for keeping the airtightness between the seat part 34 and the flare part 36 must be performed strictly, and it takes time and effort.
[0012]
In consideration of the above-mentioned facts, the present invention provides a brake pipe and a fitting that have a small number of parts, a simple structure, can be manufactured easily and inexpensively, and easy to manage the airtightness guarantee for preventing liquid leakage. The purpose is to provide a new one.
[0013]
[Means for Solving the Problems]
The brake pipe according to claim 1 of the present invention is inserted into the hose crimping portion of the fitting in the brake pipe having one end connected to the brake caliper and the other end connected to the brake hose via the fitting. A small diameter portion formed by drawing a metal pipe, which is fixed to the brake hose by caulking the hose crimping portion in a state of being inserted into the hole of the brake hose, and integrally formed with the fixed small diameter portion A large-diameter portion that penetrates a through-hole communicating with the hose crimping portion, and is provided between the small-diameter portion and the large-diameter portion between the hose crimping portion and the through-hole. A bead portion that abuts against the partition wall is formed, a hose crimping portion of the fitting is inserted into the large diameter portion, and the partition wall is abutted against the bead portion .
[0014]
By configuring as described above, in this brake pipe, the brake hose can be directly connected to the small-diameter portion of the pipe, so that the connection structure can be simplified and the connection work can be performed easily and quickly. Further, there is no portion (flare portion) for connecting pipes to pipes as in the prior art, and one integrally formed brake pipe is used. Therefore, since the portion that guarantees airtightness is only the connection portion between the brake hose and the brake pipe, the sealing performance is improved. In other words, regarding airtightness, management of airtightness assurance becomes easier as much as the connection between the seat part and flare part is eliminated, and the high-quality, high-safety brake is improved. Can provide pipes.
[0015]
Further, like a conventional fitting, a seat part formed at one end of the inner cylinder in order to connect the inner cylinder and the brake pipe, and a flare formed at the tip of the brake pipe to be connected to the seat part. Since the part and the fastening structure by the screw connection part and the flare nut are unnecessary, the processing for configuring them can be reduced, and the expensive processing cost can be reduced.
[0016]
In addition, since the small diameter part of the brake pipe is formed by drawing, the material hardness of the metal pipe can be increased by work hardening, so that the hose is inserted into the cylindrical hole of the hose crimping part and is caulked. At this time, it is possible to prevent the small diameter portion from being crushed due to the caulking pressure.
[0018]
Further, in this brake pipe, the bead portion formed between the small diameter portion and the large diameter portion pushes against the partition wall provided between the hose crimping portion and the through hole by a force that moves the brake pipe in the longitudinal direction. It can be fixed in a state where it is applied and closely adhered.
[0019]
Also, at this time, the bead part is slightly crushed or contracted and is abutted against and closely adhered to the partition wall, so that the airtightness between the partition wall and the bead part is improved, so that a through hole communicating with the hose crimping part is formed. The gap between the large-diameter portion that penetrates is blocked, and oil leakage from the small-diameter portion to the large-diameter portion is prevented.
[0020]
The fitting according to claim 2 of the present invention is the fitting in which the brake pipe according to claim 1 is used, wherein a fixing hole reaching the partition is formed in the hose crimping portion, and the edge of the fixing hole is crushed, The portion is sandwiched between the partition walls.
[0021]
By configuring as described above, in this fitting, in addition to the operation and effect of the invention of claim 1, the brake pipe and the fitting are moved relative to each other even with respect to the stress of the longitudinal load of the brake pipe. The fastening state can be reliably maintained so as not to occur, so that it is suitable for use in a device having a lot of vibration such as an automobile. At the same time, in the case where the process of fixing the brake pipe and the mouthpiece integrally is assembled and can be processed by the equipment of the automatic dedicated machine, it can be manufactured quickly and inexpensively, and the productivity can be improved.
[0022]
According to a third aspect of the present invention, in the base metal fitting according to the second aspect , a curved shape is formed at a base portion on the large diameter side of the bead portion, and a corner portion of the partition wall is crimped to the curved shape. Features.
[0023]
By configuring as described above, in addition to the operation and effect of the invention according to claim 2 , even if a liquid such as oil oozes out between the hose and the small-diameter portion due to long-term use, for example, an airtight curved portion By the structure that maintains the airtightness between the rim and the corner peripheral portion, it is possible to effectively prevent liquid such as oil from leaking out from the fitting. Of course, this configuration can also prevent gas leakage.
[0024]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment according to a brake pipe and a fitting of the present invention will be described with reference to FIGS. FIG. 1 shows a brake pipe 50 connected to a caliper (not shown) in a piping system of a hydraulic brake device of an automobile using a hose fitting body 54 according to an embodiment of the present invention, a hydraulic hose ( A connection structure for connecting the rubber hose) 52 is shown.
[0025]
As shown in FIGS. 1 and 2, the brake pipe 50 is made of a standard brake pipe (flare tube) material generally used in a piping system of a hydraulic brake device for an automobile.
[0026]
The brake pipe 50 is made of metal and is manufactured and manufactured as follows.
[0027]
First, a double-rolled steel pipe having a Vickers hardness Hv of 190 to 160 and an outer diameter of 4.76 mm is cut into a predetermined length.
[0028]
Next, in order to form a portion of 19.6 mm from the tip at one end of the double wound steel pipe cut to a predetermined length as a nipple portion 50A as a small diameter portion, one end of the double wound steel pipe A predetermined length portion of the portion is drawn so that the outer diameter is 3.5 mm. By the work hardening by this drawing process, the hardness of the nipple portion 50A is increased so that the Vickers hardness Hv is 200 or more.
[0029]
Further, in this drawing process, in the double-winding steel pipe, at the boundary part (the part adjacent to the nipple part 50A) between the part where the nipple part 50A is processed and the large diameter part which is not the drawing process, A bead portion 50B having a small flange shape (a shape protruding in a ring shape) is formed.
[0030]
As shown in FIGS. 2 and 5, the bead portion 50 </ b> B is formed in a rounded outer ring shape having a width of about 1.4 mm and an outer diameter of about 6 mm or less. Further, the bead portion 50B has an R shape (curved shape) in order to form a crushing margin at the base portion of the bead portion 50B on the caliper connection side (the large diameter portion side of the double-rolled steel pipe that has not been drawn). The formed airtight curved portion 50C (shown in FIG. 5) is provided.
[0031]
The drawing process for forming the nipple part 50A and the bead part 50B can be processed with the equipment of an automatic exclusive machine for nipples and drawing (or an automatic press machine or the like), so that it can be manufactured quickly and inexpensively. And productivity can be improved.
[0032]
As described later, the nipple portion 50A portion of the double-rolled steel pipe configured as described above has a bead portion 50B abutted against a wall surface portion provided on the support portion 64 of the outer cylinder member 56, and a hose fitting. It is fixed to the main body 54.
[0033]
As shown in FIGS. 1, 3, and 4, the outer cylindrical member 56 of the hose fitting main body 54 is entirely formed in a cylindrical shape (cylindrical body), and a flange 60 is formed on the outer periphery of an intermediate portion thereof. A rubber hose crimping part 62 is formed on one side of 60, and a support part 64 for the brake pipe 50 is formed on the other side.
[0034]
The hose crimping portion 62 has a thin cylindrical shape and is caulked after the end portion of a hydraulic hose (brake hose) 52 formed of a rubber hose is inserted into the cylindrical hole 62A so that the hydraulic hose 52 can be prevented from coming off. It is configured. If necessary, the flange 60 is formed with a hexagonal shape that is the outer shape of the nut, and functions as a spanner detent.
[0035]
Further, the support portion 64 of the outer cylinder member 56 is formed with a through hole 64 </ b> A that communicates with the cylinder hole of the hose crimping portion 62 and that is slightly larger than the outer diameter of the brake pipe 50. .
[0036]
Further, as shown in FIG. 3, a hose is fixed to the outer cylinder member 56 in order to fix the bead part 50 </ b> B of the brake pipe 50 between the cylindrical hole 62 </ b> A of the hose crimping part 62 and the through hole 64 </ b> A of the support part 64. A fixing hole 66 is formed so as to be concentric with the cylindrical hole 62A of the crimping portion 62, and has an inner diameter of 6 mm slightly larger than the maximum outer diameter of the bead portion 50B and a length of 3 mm.
[0037]
The outer cylinder member 56 configured in this manner has the hose crimping portion 62 facing forward from the caliper connection side of the double-winding steel pipe that is the material of the brake pipe 50 (the non-drawing side of the double-winding steel pipe). By inserting, it sets to the state for the assembly | attachment crimping process shown in FIG.
[0038]
3, the bead portion 50B of the brake pipe 50 is inserted into the fixing hole 66 of the outer cylinder member 56, and the fixing hole 66 and the support portion 64 in the outer cylinder member 56 are inserted. The airtight curved portion 50C (illustrated in FIG. 5) of the brake pipe 50 comes into contact with a rectangular peripheral edge portion 68 of the step portion (wall surface portion) formed in the through hole 64A of the partition wall.
[0039]
At this time, the thin cylindrical hose crimping portion 62 is configured so that the nipple portion 50A of the brake pipe 50 is concentrically accommodated in the cylindrical hole 62A.
[0040]
The brake pipe 50 and the outer cylinder member 56 are set in an automatic assembly and caulking machine whose main part is illustrated in FIG. 3 while being held in a state for assembling and caulking.
[0041]
In this automatic assembly and caulking machine, the brake pipe 50 is passed through the through hole of the caulking jig 74, the end surface on the support portion 64 side of the outer cylinder member 56 is pressed, and the caulking from the tube hole opening side of the hose crimping portion 62 to the inside of the tube hole The pin 70 is inserted.
[0042]
The caulking pin 70 has a thick cylindrical shape, and a plastic working head 72 having an outer diameter of 7.5 mm and a height of 2 mm is formed at the tip thereof. Further, the caulking pin 70 is provided with a through hole 76 through the nipple portion 50A along the central axis.
[0043]
In this automatic assembly and caulking machine, as shown in FIG. 3, the end surface around the fixing hole 66 is fixed by the plastic working head 72 by pushing the caulking pin 70 with the brake pipe 50 and the outer cylinder member 56 set. 4 is pressed and plastically deformed to form a holding structure 78 as shown in FIG. 4, and the bead 50B portion of the brake pipe 50 is connected to the angular peripheral edge 68 of the holding structure 78 and the outer cylinder member 56. The brake pipe 50 and the outer cylinder member 56 are integrated with each other.
[0044]
That is, a fixing hole 66 having an enlarged diameter so that the bead part 50B is inserted is formed in a partition wall corresponding to the bottom part of the cylindrical hole of the hose crimping part 62 in the outer cylindrical member 56, and the bead part 50B is formed in the fixing hole 66. After the insertion, the end surface portion around the fixing hole 66 that hits the bottom surface of the hose crimping portion 62 hole is plastically deformed so as to be crushed by the caulking pin 70, and the bead portion 50B is fixed to the peripheral portion of the fixing hole bottom and the holding structure. The brake pipe 50 and the outer cylinder member 56 are integrated with each other so as to be sandwiched between the portions 78.
[0045]
At this time, as shown in FIG. 5, an airtight curved portion 50 </ b> C formed in an R shape (curved shape) to form a crushing margin at the base portion of the bead portion 50 </ b> B is illustrated by an imaginary line in FIG. 5. The outer peripheral member 56 is crimped so that the corner periphery 68 bites into it. At this time, the airtight curved portion 50C and the corner peripheral portion 68 are pressed against each other so as not to form a gap, thereby forming a structure that maintains airtightness (a structure that prevents leakage of brake oil).
[0046]
In this way, since the process of fixing the brake pipe 50 and the outer cylindrical member 56 integrally can be assembled and processed by the equipment of an automatic dedicated machine (or an automatic press machine or the like), it can be manufactured quickly and inexpensively, Productivity can be improved. Further, such a fastening structure of the brake pipe and the fitting is securely held in a fastening state so that the brake pipe 50 and the outer cylinder member 56 do not move with respect to the stress of the longitudinal load of the brake pipe 50. Since it can be used, it is suitable for use with a machine with a lot of vibration such as an automobile.
[0047]
Next, as shown in FIG. 1, the double-winding steel pipe that is the material of the brake pipe 50 is used as a general connection structure from the caliper connection side (the non-drawing side of the double-winding steel pipe). The flare nut 58 is inserted, and the flare 50D is processed and formed at the caliper connection side end to complete the brake pipe and the fitting.
[0048]
As shown in FIG. 1, the brake pipe and the fitting that are configured in this manner are configured such that the hydraulic hose 52 is inserted from the opening of the hose crimping portion 62 in the hose fitting main body 54 and the nipple portion 50 </ b> A is inserted into the hole of the hydraulic hose 52. In a state in which the hydraulic hose 52 is inserted, the hydraulic hose 52 is fixed so as not to fall off by crimping the intermediate portion in the longitudinal direction of the hose crimping portion 62.
[0049]
At this time, the nipple portion 50A of the brake pipe 50 is work hardened by the drawing process of the manufacturing process and has sufficiently increased hardness, so that the hydraulic hose 52 is caulked in the cylinder hole of the hose crimping portion 62. During processing, the nipple portion 50A can be prevented from being crushed.
[0050]
In the process of caulking the hose crimping part 62, if the nipple part 50A is crushed or contracted, there is a risk of liquid leakage from between the nipple part 50A and the hydraulic hose 52, so the Vickers hardness Hv of the nipple part Although there are brake pipes and fittings that are required to be 200 or more, the brake pipe and fittings of the present embodiment can also be used as brake pipes and fittings that meet such requirements.
[0051]
Furthermore, in the brake pipe and the fitting that are connected to the hydraulic hose 52 in this way, even if brake oil oozes out between the hydraulic hose 52 and the nipple portion 50A due to long-term use, for example, the airtight curved portion 50C and the corner periphery Due to the structure that maintains the airtightness with the portion 68, it is possible to effectively prevent the brake oil from leaking out from the through hole 64A of the support portion 64.
[0052]
That is, in this fitting, since the inside of the cylindrical hole 62A of the hose crimping portion 62 is closed to keep airtight with the brake pipe 50, a gap between the brake pipe 50 and the brake pipe 50 is reached. Thus, even if the hydraulic hose 52 is deteriorated due to aging, the reliability of the hose fitting can be improved, and the service life of the hydraulic hose 52 can be extended.
[0053]
At the same time, in the brake pipe and the fitting, since the hydraulic hose 52 is directly connected to the nipple portion 50A of the brake pipe 50, in order to connect the inner cylinder 18 and the brake pipe 10 as in the conventional fitting. A frustoconical seat portion 34 formed at one end of the inner cylinder 18; a flare portion 36 formed by expanding the tip of the brake pipe 10 to expand toward the end for connection to the seat portion 34; and screw connection Since the fastening structure by the part 24 and the flare nut 28 becomes unnecessary, the processing for constituting them can be reduced, and the expensive processing cost can be reduced.
[0054]
Moreover, since the connection part which fastens the sheet | seat part 34 of the inner cylinder 18 and the flare part 36 of the brake pipe 10 using the screw connection part 24 and the flare nut 28 like the conventional metal fittings can be reduced. The number of mounting steps can be reduced, and the connection work between the brake pipe and the fitting and the hydraulic hose 52 can be performed easily and quickly.
[0055]
In addition, regarding airtightness, the management of airtightness assurance becomes easier as much as the connection part between the seat part 34 and the flare part 36 is eliminated, and the stability to maintain airtightness is improved and the quality and safety are improved. High brake pipes and fittings.
[0056]
1 is connected to a caliper (not shown) in a piping system of a hydraulic brake device of an automobile, and a conventional connection structure is connected to the brake pipe and the metal fitting to which the hydraulic hose 52 shown in FIG. 1 is connected. Used by being connected by.
[0057]
The present invention is not limited to the above-described embodiment, and constitutes the hose fitting main body 54 by integrally attaching the outer cylinder member 56 to the nipple portion 50A formed on the brake pipe. Of course, other various configurations can be used.
[0058]
【The invention's effect】
By configuring the brake pipe and the fitting of the present invention as described above, the number of components is small, the structure is simple, the structure can be manufactured easily and inexpensively, and the airtightness guarantee management for preventing liquid leakage is achieved. There is an effect that can be easily performed.
[Brief description of the drawings]
FIG. 1 is a partial cross-sectional front view showing the entirety of a brake pipe and a fitting according to an embodiment of the present invention.
FIG. 2 is a perspective view showing a brake pipe portion extracted from the brake pipe and the metal fitting according to the embodiment of the present invention.
FIG. 3 is a cross-sectional view showing a state before connecting the brake pipe and the outer cylinder member in the brake pipe and the fitting according to the embodiment of the present invention.
FIG. 4 is a cross-sectional view showing a state in which the brake pipe and the outer cylinder member are connected in the brake pipe and the fitting according to the embodiment of the present invention.
FIG. 5 is an enlarged sectional view showing a bead portion of the brake pipe in the brake pipe and the fitting according to the embodiment of the present invention.
FIG. 6 is an enlarged cross-sectional view of a main part illustrating a brake pipe and a fitting of a portion connecting a brake pipe (flare tube) and a rubber hose in a conventional hydraulic brake device for an automobile.
[Explanation of symbols]
50 Brake pipe 50A Nipple part 50B Bead part 50C Airtight structure part 52 Hydraulic hose 54 Hose fitting body 56 Outer cylinder member 60 Flange 62 Hose crimping part 64A Through hole 64 Supporting part 66 Fixing hole 68 Square peripheral part 70 Caulking pin 72 Head for Plastic Processing 74 Caulking Jig

Claims (3)

In the brake pipe where one end is connected to the brake caliper and the other end is connected to the brake hose via the fitting,
A small-diameter portion formed by drawing a metal pipe, which is inserted into the hose crimping portion of the fitting and is fixed to the brake hose by caulking the hose crimping portion while being inserted into the hole of the brake hose. When,
A large diameter portion integrally formed with the fixed small diameter portion and penetrating through a through hole communicating with the hose crimping portion;
Consists of
Between the small diameter portion and the large diameter portion, a bead portion that is abutted against a partition wall provided between the hose crimping portion and the through hole is formed,
A brake pipe , wherein a hose crimping portion of the fitting is inserted into the large-diameter portion, and the partition wall is abutted against the bead portion . In the mouthpiece in which the brake pipe according to claim 1 is used,
A metal fitting characterized in that a fixing hole reaching the partition wall is formed in the hose crimping portion, a hole edge portion of the fixing hole is crushed, and the bead portion is sandwiched between the partition wall. 3. The metal fitting according to claim 2, wherein a curved shape is formed at a base portion of the bead portion on the large diameter portion side, and a corner portion of the partition wall is crimped to the curved shape.

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