JPH071343Y2 - Oil tank - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an oil tank mounted in a steering circuit of a vehicle, for example.

(Prior Art) Power steering is widely used to smoothly steer construction machines such as automobiles and wheel loaders, and an oil tank 31 is provided in a steering circuit 30 shown in FIG. . The oil tank 31 is provided with a filter element 32 which is made to flow from the inside to the outside in order to capture dust and metal powder in the oil returning through the sliding portion 34 in the steering circuit. And after operating for a certain time Filter element
I'm going to replace the 32. Oil tank 31 in this case
In order to drain and empty the oil filled inside, the drain port 33 provided in the middle of the steering circuit is opened to drain the oil to the outside.

(Problems to be solved by the invention) As the oil level in the oil tank goes down, the oil inside the filter element passes through the filter medium and flows out into the oil tank with a slight delay, and finally a small amount of oil is put inside the filter element. Leave it empty. When removing the filter element, the filter element is moved diagonally to the left and right, so oil droplets containing dust and metal powder fall from the opening at the bottom of the element to the clean side in the tank, and unclean oil is mixed in the steering wheel. There is a problem that the sliding parts of the circuit are worn.

A technique for closing the filter outlet hole when removing the filter is known from Japanese Utility Model Publication No. 50-31995, but this is used in a disposable oil filter and cannot be applied to the oil tank of the present invention. . In the case of an oil filter, do not let the oil filled in the container come out when the oil is removed.For example, even if the oil comes out from the filter outlet hole, it is clean oil that is filtered with a filter medium and does not contain dust or metal powder The oil drops never mix.

(Means for Solving the Problem) The present application is intended to prevent dust and metal powder trapped inside the element during replacement of the filter element from flowing out into the housing together with residual oil, Inside the housing, which has an inlet pipe and an outlet pipe at the bottom and an oil inlet with a cap attached to the upper wall, a filter medium is placed around a porous inner cylinder, and the upper end is the upper end plate and the lower end is In an oil tank in which a filter element fixed by a lower end plate having an inflow opening is arranged so that the inside of the element communicates with the inside of the inlet pipe, a screw groove is formed on the inner circumference of the inlet pipe, and the filter is On the outside of the lower end plate of the element, a connecting pipe having a thread groove on the outer periphery is integrally provided, and the connecting pipe is screwed to the inlet pipe, A valve that opens the inflow opening toward the inside of the filter element is provided inside the end plate.

(Function) The oil pumped to the steering circuit by the oil pump flows into the filter element while pushing up the valve provided inside the lower end plate of the filter element, is filtered by the filter medium, enters the oil tank, and exits from the outlet pipe. Turn to the steering circuit again. After the specified operating time, remove the oil in the oil tank and the oil in the filter element, and replace the filter element. When the oil in the filter element is removed or replaced, the valve provided inside the lower end plate closes the inflow opening, and the oil containing dust and metal powder remaining inside the element does not flow out through the inflow opening.

(Embodiment) The oil tank 1 shown in FIGS. 1 and 2 comprises a housing 2 and a filter element 10 disposed therein.

The housing 2 is made of synthetic resin, such as nylon resin, and has a rectangular parallelepiped shape. An inlet pipe 3 is provided at one end of the bottom wall and an outlet pipe 4 is provided at a lower portion of the side wall. Filter element described later
An oil injection opening 5 surrounded by a rising wall having a diameter slightly larger than 10 is provided, and an air breather pipe 6 is provided at another portion of the upper wall. 7 is an oil injection opening 5
It is a cap that closes the
A screen 8 of about 50 to 100 mesh is placed on the rising wall of the oil injection opening 5. Filter element
Reference numeral 10 denotes a filter material 11 such as a filter paper or a non-woven fabric, which is pleated and arranged in a chrysanthemum shape around an inner cylinder 12 having a porosity, and end plates at both ends thereof.
The lower end plate 13 is integrally formed with a projecting connection pipe 15 having an inflow opening 16 on the lower side, that is, on the outer side, and a thread groove is provided on the outer periphery thereof. A one-way valve 19 that allows a flow only from the center to the outside is attached to the upper end plate, and a plurality of handles 20 radially extending from the periphery of the one-way valve 19 with an appropriate plate thickness are provided.

A plate-shaped valve 17 having a diameter sufficient to close the inflow opening 16 is disposed above the lower end plate 13, that is, on the inner side thereof, and a cage-shaped guide 18 is fixed to the lower end plate 13 around the valve 17.

The oil that has flowed through the steering circuit is the inflow opening of the connection pipe 15 that is screwed into the inlet pipe 3 of the oil tank 1.
The gas flows into the filter element 10, enters the inside of the filter element 10 while pushing up the valve 17, passes through the filter medium 11 and enters the oil tank 1, and heads again from the outlet pipe 4 to the steering circuit. When the operation is stopped, the valve 17 closes the inflow opening 16 of the lower end plate 13. After a certain operating time, open the drain port provided in the clean passage of the steering circuit and drain the oil. The oil level in the oil tank 1 drops as it flows out from the outlet pipe 4, and the oil that has accumulated inside the filter element 10 with a slight delay passes through the filter medium and flows out into the oil tank 2 where metal powder and dust are collected. Oil contained in oil tank 2
Don't put it inside. The cap is removed, and the filter element 10 is rotated by holding the handle 20 of the upper end plate 14 of the filter element 10, taken out from the oil inflow opening 5, and replaced with a new filter element 10. At the time of replacement, the inflow opening 16 provided in the lower end plate 13 is closed by the valve 17, and even if a small amount of oil remains in the filter element 10, the connection pipe is closed.
No dripping from 15 into the oil tank.

As another embodiment, as shown in FIG. 3, a spring 21 is arranged between the guide 18 and the valve 17, and the valve 17 is pressed against the inflow opening 16 by the urging of the spring 21.

The valve 17 is not limited to the plate-shaped one, but may be a bullet-shaped one that contacts the inflow opening.

(Effect of the Invention) As described above, according to the present invention, the connecting pipe is integrally provided on the lower end plate of the filter element arranged in the oil tank, and the connecting pipe is detachably attached to the inlet pipe of the casing. At the same time, a valve that opens the inflow opening toward the inside of the filter element is installed inside the lower end plate, and the inflow opening is closed when the fluid to be processed does not flow into the filter element, so it remains when the filter element is removed. The dust, metal powder and unclean oil trapped inside the filter element along with the oil do not drip into the housing from the inflow opening, and the sliding part in the steering circuit may be worn by the dust or metal powder. Absent.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of an oil tank of the present invention, FIG. 2 is a top view thereof, FIG. 3 is another embodiment, and FIG. 4 is a steering circuit diagram. 1 ... Oil tank, 2 ... Housing 3 ... Inlet pipe, 10 ... Filter element 13 ... Bottom plate, 15 ... Connection pipe 16 ... Inflow opening, 17 ... Valve 18 ... Guide

Continuation of front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display area F15B 1/26

Claims (1)

[Scope of utility model registration request] 1. A filter medium is disposed around a perforated inner cylinder in a housing having an inlet pipe and an outlet pipe at the bottom and an oil inlet having a cap mounted on the upper wall, and the upper end thereof is at the upper end. In a plate, a filter element having a lower end fixed to the lower end plate having an inflow opening is arranged in an oil tank so that the inside of the element communicates with the inside of the inlet pipe. A connecting pipe having a thread groove formed on the outer periphery is integrally provided outside the lower end plate of the filter element, the connecting pipe is screwed to the inlet pipe, and the inflow opening is further provided inside the lower end plate. An oil tank characterized in that a valve that opens to the inside of the filter element is arranged.