JPH094776A - Leaf spring clamp for low pressure hose - Google Patents

Abstract

PURPOSE: To prevent lowering of a clamp force of a leaf spring part even when a flexible hose is expanded and contracted by pulsation working oil by providing a stopper to prevent the leaf spring after mounting from spreading by a specified amount or more. CONSTITUTION: In a leaf spring clamp for a low pressure hose, since a stopper 1 is arranged on the tip side of a plate part 2 for a stopper, even when a flexible hose is expanded due to pulsation of working oil flowing through a flexible hose of which a low pressure hose connection part consists, a flange part 3 hooks the stopper 1 to suppress spread of the leaf spring part 6. As a result, sealing ability between a flexible hose and a metallic tube is kept and leakage of working oil is completely suppressed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a leaf spring clamp for a low pressure hose. More specifically, the present invention relates to a leaf spring clamp for a low pressure hose which is mounted on the outer periphery of a low pressure hose connecting portion formed by connecting a flexible hose and a metal tube in a low pressure piping portion of a power steering piping system for an automobile. is there.

[0002]

2. Description of the Related Art In recent years, there has been a remarkable spread of automobiles equipped with a power steering that can be operated with a light force.

In a power steering piping system of an automobile equipped with this type of power steering, a high pressure hydraulic piping system for feeding high pressure oil from the pump to the steering wheel and a low pressure oil whose high pressure oil has been reduced to a low pressure by a power steering operation are pumped. There is a low pressure hydraulic piping system to return to.

The connection of the flexible hose in the high-pressure hydraulic piping system is performed by first fitting the end portion of the flexible hose into the hose fastening portion of the outer-cylinder crimp type hose fastening fitting, and then crimping and fastening. After that, it is screwed and connected to another connecting portion through the screw portion of the fastened outer tube caulking type hose fastener.

On the other hand, in the connection of the flexible hose in the low pressure hydraulic piping system, first, the end portion of the metal tube connected to the end portion of the flexible hose is inserted to form the low pressure hose connection portion, and then the low pressure A leaf spring clamp for a low pressure hose is attached to the outer circumference of a flexible hose that constitutes a hose connection, and the flexible hose and the metal tube are fixed by the clamping force of the leaf spring clamp for the low pressure hose. There is.

FIG. 4 is a perspective view showing such a conventional leaf spring clamp for a low pressure hose. In FIG. 4, 6 is a leaf spring part, 3 and 3 are collar parts.

As can be seen from FIG. 4, the low-pressure hose leaf spring clamp is first mounted on the outer periphery of the flexible hose constituting the low-pressure hose connection portion by the operator gripping and expanding the collar portions 3 and 3. Then, the worker loosens the collars 3 and 3 and fixes the flexible hose and the metal tube by the clamping force of the leaf spring 6.

By the way, in the flexible hose constituting the low-pressure hose connecting portion, the low-pressure oil has a considerable pressure and pulsating hydraulic oil. Therefore, the flexible hose swells or shrinks as the pulsating hydraulic fluid flows. As the flexible hose expands and contracts repeatedly, the low-pressure hose leaf spring clamp also expands and contracts repeatedly.

When such a leaf spring clamp for low pressure hoses repeatedly expands and contracts, the clamping force of the leaf spring portion 6 of the leaf spring clamp for low pressure hoses decreases, and as a result, the flexible hose and the metal tube are broken. There is a concern that the sealability of the may deteriorate and the hydraulic oil may leak.

[0010]

SUMMARY OF THE INVENTION The present invention has been made in view of such a point, and its object is to solve the above-mentioned drawbacks of the prior art and to form a flexible low pressure hose connecting portion. (EN) Provided is a leaf spring clamp for a low pressure hose in which the clamping force of the leaf spring does not decrease even if the flexible hose swells or contracts due to pulsating hydraulic oil.

[0011]

DISCLOSURE OF THE INVENTION The gist of the present invention is to provide a leaf spring for a low pressure hose which is mounted on the outer periphery of a low pressure hose connecting portion formed by inserting the end portion of a metal tube into the end portion of a flexible hose. In the clamp, there is provided a leaf spring clamp for a low pressure hose, which is provided with a stopper capable of preventing the leaf spring portion from expanding beyond a certain amount after being mounted.

[0012]

Since the leaf spring clamp for a low pressure hose of the present invention is provided with a stopper capable of preventing the leaf spring portion from expanding beyond a certain amount after being mounted, a flexible hose forming a low pressure hose connection portion is provided. Swelling due to pulsating hydraulic oil,
Even if it contracts, it prevents the flange from spreading on the leaf spring due to the stopper.As a result, the sealing property between the flexible hose and the metal tube is maintained, and oil leakage from the low pressure hose connection occurs. It can be completely deterred.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of a leaf spring clamp for a low pressure hose of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view showing a state of an embodiment of a leaf spring clamp for a low pressure hose of the present invention after mounting a hose, FIG. 2 is an explanatory view of its four sides, and FIG. 3 is a low pressure of the present invention. FIG. 6 is a four-sided explanatory view showing the shape of a leaf spring clamp for a hose according to an embodiment of the present invention before mounting the hose.

1-3, 1 is a stopper, 2 is a stopper plate portion, 3 is a flange portion, 4 is a stopper plate, and 6 is a leaf spring portion.

That is, since one embodiment of the leaf spring clamp for a low pressure hose of the present invention is provided with the stopper 1 on the tip side of the stopper plate portion 2, it is provided in the flexible hose constituting the low pressure hose connection portion. Even if the flexible hose swells due to the pulsation of the flowing hydraulic oil, the flange portion 3 catches the stopper 1 to prevent the leaf spring portion 6 from expanding, and as a result, the flexible hose and the metal tube are prevented from expanding. The sealability is maintained, and the oil leakage of hydraulic oil can be completely suppressed.

As can be seen from FIG. 3, an embodiment of the leaf spring clamp for a low pressure hose of the present invention is locked by a stopper plate 4 before being attached to the outer circumference of a flexible hose forming a low pressure hose connection. Further, when the flexible hose constituting the low pressure hose connecting portion is mounted on the outer periphery of the flexible hose, the stopper plate 4 is removed and then mounted. In this case, stopper 4
When is removed, the plate spring portion 6 is reduced in diameter, the stopper plate portion 2 is lowered, and the stopper 1 passes through the collar portion 3 to fasten the low pressure hose connection portion.

The stopper 1 is provided at the tip of a stopper member 2 which is provided integrally with the body of the leaf spring portion 6.

FIG. 6 shows a low-pressure hose leaf spring clamp according to the present invention shown in FIG. 1 mounted on the outer periphery of a low-pressure hose connection portion, and the conventional hose leaf-spring clamp shown in FIG. 4 attached to the low-pressure hose connection portion. FIG. 7 is a graph showing a change in sealing pressure obtained by performing a heat aging test on 70 ° C. for 100 days with the one mounted on the outer periphery.

As can be seen from FIG. 6, the one in which one embodiment of the leaf spring clamp for a low pressure hose of the present invention is attached to the outer periphery of the low pressure hose connection portion has a sealing pressure even after a heat aging test at 70 ° C. for 100 days. Although only slightly decreasing, when the conventional hose leaf spring clamp of FIG. 4 is attached to the outer periphery of the low pressure hose connection portion, the seal pressure sharply decreases when a heat aging test at 70 ° C. for 100 days is performed.

FIG. 5 is a perspective view showing another embodiment of the leaf spring clamp for a low pressure hose of the present invention after the hose is mounted.

In FIG. 5, 7 is a stopper member and 5 is a stopper.

That is, in another embodiment of the leaf spring clamp for a low pressure hose of the present invention, a separate stopper member 7 is attached after mounting on the outer circumference of the flexible hose constituting the low pressure hose connection portion. The stopper 5 prevents the plate spring portion 6 from expanding.

[0024]

The leaf spring clamp for a low pressure hose of the present invention, when mounted on the outer periphery of a low pressure hose connecting portion formed by connecting a flexible hose and a metal tube, is flexible to form the low pressure hose connecting portion. Even if the flexible hose repeatedly swells or shrinks due to pulsating fluid, the flange part can stop the spread of the leaf spring part, and as a result, the sealing property between the flexible hose and the metal tube can be maintained. This makes it possible to completely prevent the occurrence of oil leakage from the low pressure hose connection portion, and is industrially useful.

[Brief description of drawings]

FIG. 1 is a perspective view showing a state after mounting a hose of an embodiment product of a leaf spring clamp for a low pressure hose of the present invention.

FIG. 2 is an explanatory view of four sides of FIG.

FIG. 3 is a four-sided explanatory view showing the shape of the embodiment of the leaf spring clamp for a low pressure hose of the present invention of FIG. 1 before the hose is attached.

FIG. 4 is a perspective view showing a conventional leaf spring clamp for a low pressure hose.

FIG. 5 is a perspective view showing a state after mounting the leaf spring clamp for a low pressure hose of another embodiment of the present invention.

FIG. 6 shows an example of a leaf spring clamp for a low pressure hose of the present invention mounted on the outer periphery of a low pressure hose connecting portion and a conventional leaf spring clamp for a hose mounted on the outer periphery of a low pressure hose connecting portion at 70 ° C. It is a graph in which a heat aging test for 100 days was performed and a change in seal pressure was obtained.

[Explanation of symbols]

 1,5 Stopper 2 Stopper plate part 3 Collar part 4 Stopper 6 Plate spring part 7 Stopper member

Claims (3)

[Claims] 1. A leaf spring clamp for a low pressure hose, which is attached to the outer periphery of a low pressure hose connecting portion formed by inserting the end portion of a metal tube into the end portion of a flexible hose, wherein the leaf spring clamp for the low pressure hose is attached. A leaf spring clamp for a low pressure hose, characterized in that a stopper is provided to prevent the leaf spring portion from expanding beyond a certain amount later. 2. A leaf spring clamp for a low pressure hose according to claim 1, wherein the stopper is provided at a tip end portion of a stopper member which is integrally provided on the leaf spring portion main body. 3. The stopper is provided on a stopper member which is separate from the leaf spring portion main body.
Leaf spring clamp for low pressure hose described.