JPH06337088A - Pressure hose - Google Patents

Abstract

PURPOSE:To prevent the occurrence of oil pressure pulsation by fastening an orifice in a hose coaxially, and laying a flexible tube in the hose coaxially with each end connected to the upstream and downstream ends of the orifice. CONSTITUTION:An orifice 5 is provided in the rubber hose 4 of a pressure hose 1 in such a way as coaxial with the rubber hose 4 at an intermediate position dividing the overall length of the hose 1 according to an approximate ratio of 4 to 6 measured from the side of an oil pump, and fastened with a caulking clamp 6. Also, the ends of flexible tubes 7 and 7 spiralled in the same direction are inserted in both ends of the orifice 5, caulked and fixed in the hose 4 coaxially. Ferrules 8 at both ends of the hose 4 and the other end of each flexible tube 7 are set to have a roughly equal distance. Furthermore, when a pressure hose 3 having a flexible tube 9 is combined with a downstream side, a pulsation reducing effect can be enhanced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure hose connected between an oil pump and a switching valve in a vehicle power steering device or the like.

[0002]

2. Description of the Related Art As described in Japanese Utility Model Laid-Open No. 312090, a pressure hose in a conventional power steering apparatus for a vehicle has a support tube fixed to an inner middle portion of an elastic hose so that both ends of the support tube are fixed. The spiral tubes with the spiral directions reversed are respectively fitted inside, but the inner diameter of the support tube is a certain size that matches the outer diameter of the spiral tube, and the support oil has a throttle of internal oil. Since it has no function, the pulsation-preventing action of oil pressure by only the spiral tube is not always effective.

[0003]

SUMMARY OF THE INVENTION The present invention provides a power steering device for a vehicle, etc., in which two flexible tubes are attached to an intermediate portion in a pressure hose, and an oil throttling function is imparted to the inside of the pressure hose. It is intended to make the pulsation-preventing action of the above effective.

[0004]

Therefore, a pressure hose according to the present invention has an orifice fixed coaxially with the hose and one end attached to the upstream and downstream ends of the orifice. It has two flexible tubes arranged coaxially with the hose.

[0005]

That is, the orifice is fixed coaxially with the hose, and at the same time, one end of the flexible tube is attached to the upstream and downstream ends of the orifice, and two flexible tubes are provided in the hose. Since it is arranged coaxially with the two flexible tubes and the orifice arranged between them, the pulsation of the oil pressure sent from the oil pump into the hose can be easily reduced. it can.

[0006]

Embodiments of the present invention shown in the drawings will be specifically described below. In a power steering device of a vehicle, a pressure hose 1, a pressure tube 2 and a pressure hose 3 are sequentially connected from an oil pump side on the left side in the drawing, which is an upstream side, toward a switching valve side on a downstream side, and a rubber hose 4 of the pressure hose 1 , An orifice 5 is arranged coaxially with the rubber hose 4 at an intermediate position where the entire length of the pressure hose 1 is divided into about 4: 6 from the oil pump side.
It is fixed in that position by a caulking clamp 6.

At one end of the orifice 5, one end of a flexible tube 7 having a spiral formed in the same direction is inserted and caulked, and each flexible tube 7 is fixed in the rubber hose 4 coaxially therewith. 4 The bases 8 at both ends and the other ends of the flexible tubes 7 are configured to be substantially equidistant. Further, one end of the flexible tube 9 is fixed to the downstream side nipple 10 of the downstream pressure hose 3, and
The other end extends upstream in the rubber hose 11, and the flexible tube 9 is coaxially arranged in the rubber hose 11.

In the above device, the pressure hose 1
The orifice 5 is arranged at the intermediate position of the flexible tube 7 and the flexible tube 7 is provided on the upstream and downstream sides of the orifice 5, respectively.
Is attached to the rubber hose 4 by the orifice 5, so that the pulsation of the oil pressure sent from the oil pump into the pressure hose 1 is effectively reduced by the synergistic action of the orifice 5 and the two flexible tubes 7. Further, by combining the downstream pressure hose 3 in which the flexible tube 9 is arranged in the rubber hose 11, the pulsation reduction effect of the oil pressure can be further enhanced.

If the pulsation characteristic of the oil pressure in the pressure hose 1 changes due to a change in the power steering device equipped with the pressure hose 1 or the vehicle type, the inner diameter of the orifice 5 is adjusted. Since it is possible to take measures against oil pressure pulsation relatively easily without particularly changing other parts, it is practically very convenient.

Depending on the pulsation characteristics of the oil pressure in the pressure hose, the flexible tube 9 in the downstream pressure hose 3 may be omitted, or even if the downstream pressure hose 3 itself is omitted, the upstream pressure hose may be omitted. The oil pressure pulsation in the hose can be reduced to such an extent that there is no practical problem by using the orifice in (1) and the two flexible tubes attached thereby, and the two tubes attached to the orifice in the pressure hose. It is needless to say that the flexible tubes may have the spirals in opposite directions depending on the oil pressure pulsation characteristic in the hose.

[0011]

In the pressure hose according to the present invention, the orifice is fixed in the hose, one end of each flexible tube is attached to the upstream and downstream ends of the orifice, and two flexible tubes are provided in the hose. By arranging it coaxially with the hose, it is possible to easily reduce the pulsation of the oil pressure sent from the oil pump into the hose, and also in the power steering device or vehicle type equipped with this pressure hose. By adjusting the inner diameter of the orifice accordingly, it is possible to relatively easily take measures against the pulsation of the oil pressure, which is a feature that is practically very convenient.

[Brief description of drawings]

FIG. 1 is a side view showing a vertical cross-section of a main part of an upper half in an embodiment of the present invention.

[Explanation of symbols]

 1 Pressure hose 2 Pressure tube 3 Pressure hose 4 Rubber hose 5 Orifice 7 Flexible tube 9 Flexible tube 11 Rubber hose

Claims (1)

[Claims] 1. An orifice fixed in the hose coaxially with the hose, and two flexible tubes having one end attached to the upstream and downstream ends of the orifice and arranged coaxially with the hose in the hose. Pressure hose with.