JPH0630600Y2 - Oil cooler for power steering - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an oil cooler for cooling working oil for a power steering device.

<Prior Art> In a conventional oil cooler for a power steering apparatus, a pipe for returning oil from a servo valve to a reservoir tank is led to a well-ventilated front surface of a radiator.

<Problems to be solved by the invention> There is a problem that the heat dissipation effect is not sufficient and the oil cannot be sufficiently cooled only by guiding the pipe to the front of the radiator.

<Means for Solving Problems> Therefore, in the present invention, a part of the air cooling pipe connecting the servo valve and the pump or the servo valve and the reservoir tank is guided to the front of the vehicle, and the air cooling pipe is partially cooled. It is characterized in that a large-diameter portion having a diameter larger than that of the pipe for use is provided, and taper portions whose diameter decreases toward the air-cooling pipe are provided at both ends of the large-diameter portion.

<Operation> When the oil flows in the air cooling pipe, the heat of the oil is dissipated into the air through the large diameter portion of the air cooling pipe having a large surface area. When the oil flows through the large-diameter portion, the flow velocity of the oil is slowed down, the cooling time becomes longer, and the oil can be sufficiently cooled. Further, the large diameter portion reduces the flow passage resistance, and the tapered portion can suppress the increase in the flow passage resistance.

<Example> Hereinafter, an example of the present invention will be described. In FIG. 1, 10 is a pump, 11 is a rack and pinion type power steering device, and has a power cylinder 12 in the center and a servo valve 14 on the input shaft 13 side. A handle 16 and a handle shaft 17 are connected to the input shaft 13 via a universal joint 15. Discharge port 20 of pump 10 and servo valve 1
The supply port 21 of 4 is connected by the high pressure hose 22, and the distribution port 2
The pipes 3 and 24 are connected to the supply / discharge port of the power cylinder 12 by a pipe 25. One end of a pipe 27 is connected to the discharge port 26 of the servo valve 14, and this pipe is guided to the front surface of a radiator provided in the front part of the vehicle, is bent, and the other end is connected to the reservoir 10a. This pipe 2
As shown in FIG. 2, the diameter D2 of the pipe 27 is larger than the diameter D1 of the pipe 27, and the diameter D2 (> D) is bent in a U shape.
The U-shaped large-diameter portion 31 of 1) is provided, and the tapered portions T whose diameter decreases toward the pipe 27 having the diameter D1 are provided at both ends of the large-diameter portion 31.

In the above embodiment, the large-diameter portion 31 reduces the flow path resistance and enhances the oil cooling effect. Moreover,
The tapered portion allows the oil to smoothly flow from the pipe 27 having the diameter D1 to the pipe 27 having the diameter D2, and there is no fear that the flow path resistance increases.

<Effects of the Invention> As described above, according to the present invention, a part of the air cooling pipe connecting the servo valve and the pump or the servo valve and the reservoir tank is guided to the front of the vehicle. Since the large-diameter portion is provided, the flow velocity of the power steering device operating oil becomes slower in the large-diameter portion, the cooling time becomes longer, and the oil can be sufficiently cooled. Also,
By making the diameter large, the surface area of the pipe becomes large, and the effect that the oil can be cooled more sufficiently can be obtained. Furthermore, the effect of reducing the flow path resistance can be obtained by using the large diameter portion. Further, since the oil is smoothly flowed by providing tapered portions at both ends of the large diameter portion toward the air cooling pipe, the oil flows smoothly like a stepped portion where the diameter suddenly changes. There is no risk of large turbulence and no increase in flow path resistance. As described above, according to the present invention, it is possible to enhance the oil cooling effect and reduce the flow path resistance without increasing the installation space.

[Brief description of drawings]

The drawings show an embodiment of the present invention. FIG. 1 is an overall view of a power steering apparatus, and FIG. 2 is a sectional view showing a main part. 10a ... Reservoir, 14 ... Servo valve, 27 ... Pipe, 31 ... Large diameter part.

Claims (1)

[Scope of utility model registration request] 1. An oil cooler for a power steering device, wherein a servo valve is operated by rotation of an input shaft according to a handle operation to guide a fluid supplied to a pump to a power cylinder to assist a steering force, the servo valve and the pump. Alternatively, a part of the air cooling pipe connecting the servo valve and the reservoir is guided to the front of the vehicle, and a large diameter part having a diameter larger than that of the air cooling pipe is provided in a part of this air cooling pipe, and both ends of this large diameter part are provided. An oil cooler for a power steering apparatus, characterized in that a taper portion whose diameter decreases toward the air cooling pipe is provided.