JPS62246680A - Safety hose - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to safety parts for automobiles, and particularly to a hose connecting between a fuel conduit and a fuel tank.

This type of hose usually consists of a twisted fabric, such as a pair of knitted fabrics or a spiral, inserted between an elastomeric tube and a cuff. The hose is connected to the tank and to the filling conduit by clamps.

Note: In the event of a collision of four vehicles, in some cases the relative displacement between the fuel filling conduit and the fuel tank may cause the connecting hose to be torn or pulled out of its joint position, resulting in fuel leakage. arise.

The present invention provides a hose construction that reduces the possibility of the hose being torn or pulled out when there is relative displacement between the fuel conduit and the fuel tank of the vehicle.

According to the invention, the hose surrounds the elastomeric tube with a twisted reinforcing element, the reinforcing element having a circumferential component and a longitudinal component. An elastomeric cover surrounds the tube and the reinforcing element.

The cumulative tensile strength of the longitudinal reinforcing member component is significantly smaller than the cumulative tensile strength of the circumferential reinforcing member component, so that when the hose is pulled in the longitudinal direction, some of the reinforcing members will break and the pipe will not break. Allows significant elongation of the hose. The controlled cutting of the stranded reinforcing member allows for elongation of the hose so that the hose does not tear or be pulled out of the hose connection position when the fuel tank is displaced relative to the fuel fill conduit.

Embodiments and drawings illustrating the present invention will be described.

In the figure, a motor vehicle 10 has a cap 12 that closes off a fuel filling pipe 14, which is connected to a fuel tank 20 via a hose 16.18. When connecting the vent pipe 22 to the fuel pipe 14, two hoses are used. The hose is connected to the fuel fill pipe and the fuel tank by a clamp 24 or the like.

The structure of the hose 16, 18 of the present invention is as follows: 1. Prevents the hose from coming off or being pulled out when the relative position between the tank and the filling pipe changes in the event of destruction due to an automobile collision or the like.

FIG. 3.4 shows a hose according to the invention, in which an elastomeric tube 26 is surrounded by a twisted reinforcing member 28. FIG. An elastomeric cover 30 surrounds the twisted reinforcement members and tube.

The tube is made of the required elastomeric material, such as synthetic rubber or a compound thereof, which is resistant to petrochemical fuels. The tube and cover have sufficient elastomeric properties to allow stretching at a tensile strength of 125.chi., preferably 150.chi., and more preferably 200.chi. without tearing.

The reinforcing member is formed by twisting the required fibers 9, such as rayon, nylon, aramid, Nomex, polyester, etc., and does not undergo radial and longitudinal elongation at constant fuel tank pressure. Radial elongation is prevented by a circumferential component of the reinforcing member, and longitudinal elongation is prevented by a longitudinal component of the reinforcing member. The cumulative tensile strength of the longitudinal component is significantly smaller than the cumulative tensile strength of the circumferential component, and in some cases, such as when the fuel pipe is displaced from the fuel tank, some of the threads forming the longitudinal reinforcing component break and cause the hose to break. allows large elongation in the longitudinal direction without breaking.

In a preferred example, a difference in cumulative tensile strength of nine circumferential longitudinal reinforcing components is obtained by means of twisted reinforcing elements surrounding the tube. By alternately knitting the first yarn 32 and the second yarn 34 with low tensile strength, each stitch 36 has a helical component 38 and a longitudinal component 40 at a helical angle A. In the example shown in FIGS. 3 and 4, it is a single knit. Alternating reeds are achieved by winding first and second yarns on alternate yarn spools of the knitting machine.

A more complicated stitch is, for example, lock stitch 41 in FIG. In the case of lock knitting, two successive spools of the first yarn and two successive spools of the second yarn of the knitting machine are used alternately. The cumulative tensile strength in the longitudinal direction of the finished knit is significantly lower than the cumulative tensile strength in the circumferential direction due to the lower tensile strength of the second yarn.

In a preferred example, the hose has an inner diameter of 1.25 inches (approximately 31 mm).
, manufactured in a tube with a thickness of 0.1 lin (2.8 mm). Made of tube honeytrile (NBR) rubber with ultimate tensile strength of 175p
si (12kg/c+II).

The ultimate elongation was set to 400χ. A lock knit reinforcing member surrounds the tube and is made of polyester yarn with a tensile strength of 21# and a tensile strength of 6
It is alternately knitted with # nylon thread. Thickness 0.06i
A cover of n (1,5 mm) surrounds the tube and the knitted reinforcing element. The cover is made of chlorinated polyethylene with a tensile strength of 1
900psi (86kg/ail), ultimate elongation 235χ
has. The example tube exhibits little radial expansion or longitudinal elongation at steady fuel tank pressure, and has a minimum burst strength of 97 psi (6.8 kg/cJ).

In use, the hose described above was connected between the fuel fill conduit and the fuel tank. The hoses were connected by band-type clamps. When the fuel conduit is displaced from the fuel tank, the hose is pulled and the longitudinal components of the weaker second thread form the cuts 42 of FIG. 5, and the tube and cover are separated by 150% without rupture. As described above, in the preferred example, an elongation of 200χ occurs. The broken thread reduces the tensile strength of the hose and prevents it from being pulled out of the bonded position.

FIG. 7 shows a twisted reinforcing member according to another embodiment of the invention. This reinforcing member is in the form of a woven tire cord 44, with warp threads 46 held in parallel position by lightweight darning threads 48. The warp threads are generally circumferential and form a circumferential reinforcing member component. The weak darning thread is longitudinal and forms the longitudinal component. When the hose is pulled in the longitudinal direction, the darning thread breaks.

Although the present invention has been described with reference to preferred embodiments, the embodiments and drawings are illustrative and do not limit the invention.

[Brief explanation of drawings]

Fig. 1 is a diagram of an automobile using the hose of the present invention;
The figure is a developed view showing the hose of the present invention between the fuel tank and the fuel filling conduit approximately along the line 2-2 of FIG. 1, and FIG. 3 is an enlarged view with a part of the hose of FIG. 4 is a partially enlarged view taken along line 4--4 in FIG. 3; FIG. 5 is a diagram showing the yarn of FIG. 4 broken by longitudinal tension; and FIG. 6 is a diagram showing another stitch. FIG. 7 is a diagram of another embodiment of the reinforcing member. 10. , Automobile, 12. ,,cap, 1
4. , filling conduit. 16.1B, Hose, 20. ,,tank, 2
4. , clamp. 266. tube, 28. ,, reinforcing member, 30. ,,
cover.

Claims (1)

[Claims] 1. A hose having an elastomer tube, a twisted reinforcing member surrounding the tube, and an elastomer cover surrounding the tube and the reinforcing member, in which a first thread and a second tensilely weak thread are provided. The stitch formed by alternately knitting has a helical direction component and a longitudinal direction component with respect to the tube, and the cumulative tensile strength of the longitudinal direction stitch component is significantly greater than the cumulative tensile strength of the spiral direction stitch component. A safety hose characterized in that a part of the stitches of the second yarn are made small to form a breaking device to allow a large elongation of the hose without breaking the tube. 2. The safety hose according to claim 1, wherein the tensile strength of the first thread is at least 3.5 times the strength of the second thread. 3. The tensile strength of the second thread is approximately 61b (2.7kg)
The tensile strength of the first yarn is approximately 21 1b (9.5k
g) The safety hose according to claim 2, characterized in that: 4. A safety hose according to claim 1, characterized in that when the hose is pulled longitudinally, it stretches by at least 150% of its length without tube rupture. 5. The safety hose according to claim 1, characterized in that when the hose is pulled in the longitudinal direction, it stretches by at least 200% of its length without causing pipe rupture. 6. In a hose having an elastomeric tube, a twisted reinforcing member surrounding the tube, and an elastomeric cover surrounding the tube and the reinforcing member, a twisted fabric having a circumferential reinforcing member component and a longitudinal reinforcing member component reinforcing member, the cumulative tensile strength of the longitudinal stitch component is significantly smaller than the cumulative tensile strength of the longitudinal stitch component, so that some of the stitches of the second yarn form a breaking device and the tube breaks. A safety hose that is characterized by allowing large elongation of the hose without causing it to elongate.