JPS5832001Y2 - Working oil suction pipe - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a hydraulic oil suction pipe for adjusting the vertical movement of a working machine used in a power agricultural machine, for example.

Hydraulic oil is sucked up from an oil storage area such as a transmission case or oil tank by a hydraulic pump and sent to a hydraulic cylinder via a control valve that controls the lifting and lowering of the work equipment. However, if air or iron particles are mixed in the working oil, There is a risk that the control valve may malfunction or the hydraulic cylinder may be damaged, leading to an accident.

Therefore, in order to be able to remove air bubbles and iron powder on the suction side of the hydraulic pump installed in the above-mentioned hydraulic system of powered agricultural machinery, the present proposal is to create a suction pipe by joining a large diameter suction pipe and a small diameter suction pipe. One end of the above joint part of the small-diameter suction pipe is opened near the bottom of the large-diameter suction pipe, and the other end of this small-diameter suction pipe is connected to the suction side of the hydraulic pump, so that the working oil can flow over time. The hook allows the air in the working oil to be separated and removed due to the difference in weight while flowing through the large-diameter suction pipe at low speed, and a drain plug equipped with a magnet is installed near the above-mentioned joint of the large-diameter suction pipe. The structure is such that iron powder can be efficiently removed when the working oil is restricted to flow into the small-diameter suction pipe.

To explain the embodiment shown below, the large diameter suction pipe 1
A small-diameter suction pipe 2 having an inner diameter smaller than the large-diameter suction pipe 1 is connected to one end of the large-diameter suction pipe 1 at right angles to the large-diameter suction pipe 1, and the small-diameter suction pipe 2 is connected to the suction side of the hydraulic pump 4 to form a large-diameter suction pipe. The filter 5 attached to the other end of the suction pipe 1 is immersed in the working oil in the transmission case 6 of the power agricultural machine, and a short cylindrical drain seat 7 is attached to the large diameter suction pipe 1 adjacent to the joint 3. A drain plug 9 is installed approximately vertically downward, and a magnet 8 is attached to the upper end.
is screwed into the drain rear seat 7 so that the magnet 8 can attract magnetic iron powder contained in the working oil near the joint 3.

The hydraulic oil sucked into the hydraulic pump 4 is guided to the control valve 11 and the hydraulic cylinder 12 through a delivery pipe 10 connected to the discharge side of the hydraulic pump 4.

Therefore, as the hydraulic pump 4 is driven, the working oil filtered by the filter 5 flows gently in the direction of the joint 3 in the large-diameter suction pipe 1 in an almost laminar flow, and from the joint 3 flows into the small-diameter suction pipe 1. Although the hydraulic oil is rapidly sucked into the hydraulic pump 4 through the pipe 2, since the hydraulic oil suction pipe according to this invention is constructed in this way, the hydraulic oil flows through the large suction pipe for a relatively long time. During this time, light air floats to the surface, which separates the air from the working oil, and since the flow of the working oil is laminar, bubbles do not occur due to local drops in hydraulic pressure.

Moreover, since the small-diameter suction pipe opens near the bottom of the large-diameter suction pipe, it is possible to reliably avoid re-inhaling the separated air.

Furthermore, since a magnet is disposed at a position where the working oil is squeezed to flow into the small-diameter suction pipe, iron particles in the working oil are also efficiently removed.

Therefore, the hydraulic oil delivered to each part of the hydraulic system is virtually free of air bubbles and iron particles, so the hydraulic system operates without any problems and is not damaged.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway side view of a transmission case of a power agricultural machine to which the suction pipe of this invention is applied, and FIG. 2 is a partially cutaway front view of this invention.

Claims (1)

[Scope of utility model registration request] The suction side end of the small diameter suction pipe 2 that communicates with the large diameter suction pipe 1 that looks into the oil storage part is opened near the bottom near the suction outlet of the large diameter suction pipe 1, and the end is opened near the bottom of the large diameter suction pipe 1, and A suction pipe for working oil, characterized in that a drain plug 9 having a magnet 8 is provided on the large diameter suction pipe 1.