JP2576830Y2 - Piping mounting structure for oil absorption piping - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a structure for attaching an oil absorption pipe to an oil tank.

[0002]

2. Description of the Related Art An oil tank (52), a hydraulic pump, a motor, and the like are installed in a hydraulic oil supply source of a hydraulic system of an injection molding apparatus, and hydraulic oil is sent to each supply source of the apparatus. ing. In recent years, it has become a general trend to use a variable discharge pump for energy saving as a hydraulic pump. However, the above-mentioned variable pump has large noise and vibration,
Vibration is applied to the oil absorption pipe (59) connecting the variable pump to the oil tank (52).
This causes the oil tank (52) having a relatively small thickness to vibrate, thereby causing low-frequency vibration noise (100 to 250 Hz).

Therefore, as shown in FIG. 3, a flange (55) is provided on a suction pipe (51) constituting an oil absorption pipe (59),
The flange (55) was fixed to the mounting seat (56) of the oil tank (52) via the rubber foot (53) with the mounting bolt (54). In such a structure, the rubber foot (53) blocks vibration between the flange (55) and the mounting seat (56) to some extent, but the mounting bolt (5
4) is connected to the mounting seat (56), vibration is transmitted from this part, and vibration transmission is reduced by the rubber feet (53), but low-frequency vibration remains, and the vibration isolation effect is insufficient There was a disadvantage that it was.

[0004] Therefore, an attempt was made to use a bellows-like hose (not shown) for the oil-absorbing pipe line (59). However, the hose length was limited, the cost was high, and it became practical. Turned out to be unsuitable.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned drawbacks of the conventional example, and the problem to be solved by the present invention has no problem in terms of cost and durability. It is an object of the present invention to provide a pipe mounting structure for an oil-absorbing pipeline which does not generate low-frequency vibration in an oil tank by blocking vibration from a variable pump.

[0006]

[Means for Solving the Problems] The pipe mounting structure of the oil suction pipe of the present invention is composed of an oil tank (2) of an oil suction pipe (3) for connecting the hydraulic pump (1) and the oil tank (2). A bush insertion hole (6a) drilled in the flange (6) of the mounting flange portion of the oil absorption pipe (3), and an elastic flange (7a) inserted into the insertion hole and in contact with the upper surface of the flange. Elastic bush (7) having
And an elastic packing (8) disposed between the flange (6) and the mounting seat (9) of the oil tank (1), and an elastic bush (7). Tightening bolt (1
0). "

[0007] Thereby, it is connected to the hydraulic pump (1),
The vibration generated by the operation of the hydraulic pump (1) is
Even if it is transmitted through (3), it is interrupted by the elastic bush (7) and the elastic packing (8), and is not transmitted to the mounting seat (9) via the tightening bolt (10). Elimination of low frequency vibration in the oil tank (2) is eliminated.

[0008]

FIG. 1 is a partially cutaway front view of a piping structure of an oil-absorbing pipeline (3) according to the present invention.
A hydraulic pump mounting base (18) is installed via the hydraulic pump mounting base (18), and the hydraulic pump (1) is bolted onto the hydraulic pump mounting base (18). Reference numeral (20) denotes a motor shaft, which is connected to a drive motor (not shown) that rotationally drives the hydraulic pump (1). The type of the hydraulic pump (1) is not particularly limited, but a variable pump is used here. An oil tank (2) is installed adjacent to the hydraulic pump (1), and the hydraulic oil
(4) is satisfied.

Reference numeral (3) denotes an oil absorbing pipe line. In this embodiment, a connecting elbow (17), an oil absorbing pipe (16), a relay pipe (15), and an elbow (1) are provided.
4), a suction pipe (5) and a strainer (13). Of course, the configuration of the oil suction pipe (3) is not limited to the above-mentioned combination, but includes all those connecting the oil tank (2) and the hydraulic pump (1). Strainer (13)
Is a filter built-in type, which is attached to the lower end of the suction pipe (5), is immersed in the hydraulic oil (4), and removes the dust in the hydraulic oil (4) while removing the hydraulic oil in the oil tank (2). (4) is being sucked.

[0010] The suction pipe (5) is provided with a flange (6), and a plurality of bush insertion holes (6a) are equally formed in the flange (6). In this embodiment, there are four locations. The diameter of the bush insertion hole (6a) is formed so as to fit the elastic insertion portion (7b) of the elastic bush (7) described later.

An elbow (14) is provided at the upper end of the suction pipe (5) for changing the direction of the pipe, and is connected to an oil absorbing pipe (16) via a relay pipe (15) and further connected. The elbow (17) is connected to the hydraulic pump (1).

Next, the connection structure between the oil absorption pipe (3) and the oil tank (2) will be described. A large-diameter through hole (12) is formed in the upper surface of the oil tank (2), and a ring-shaped mounting
(9) is installed. Screw holes (11) are formed in the mounting seat (9) at the same pitch as the bush insertion holes (6a) of the flange (6). The screw hole (11) is formed only in the mounting seat (9), and is not formed on the upper surface of the oil tank (2).

[0013] (8) is a ring-shaped elastic packing, the bush through-hole (8a) at the same pitch as the bush insertion hole (6a)
Are drilled. The material of the elastic packing (8) is not particularly limited, but is required to have excellent oil resistance and elasticity, and oil-resistant rubber is used here.

The elastic bush (7) includes an elastic insertion portion (7b) inserted into a bush insertion hole (6a) formed in the flange (6) and an elastic flange (7a) contacting the upper surface of the flange (6). And a bolt insertion hole (7c) is formed in the center thereof.
The material of the elastic bush (7) is not particularly limited, but it is necessary to have excellent oil resistance and elasticity. Here, oil-resistant rubber is used. Here, the length of the elastic insertion portion (7b) is slightly longer than the flange (6), and the length of the bush insertion hole (6a) is
When inserted into the flange (6), it projects slightly below the lower surface of the flange (6).

(10) is a normal tightening bolt, and (22) is a normal washer. The length under the neck (L) of the tightening bolt (10) is
(9), the elastic packing (8), the flange (6), the elastic flange (7a) and the sum of the thicknesses of the washer (22), the tightening allowance (generally, 0.
3-0.5 mm). The hardness of the elastic bush (7) and the elastic packing (8) is, for example, HS40.
About 50.

The elastic packing (8) is set on the mounting seat (9), and the suction pipe (5) is inserted into the large-diameter through-hole (12) on the upper surface of the oil tank (2). (6) The elastic packing
(8) Install on top. Subsequently, the elastic insertion portion (7b) of the elastic bush (7) is inserted into each of the bush insertion holes (6a) of the flange (6), and finally a washer (22) is set on the elastic flange (7a), The fastening bolt (10) is inserted into the bolt insertion hole (7c) of the elastic bush (7), and the tip of the fastening bolt (10) is screwed into the screw hole (11). As the tightening bolt (10) is tightened, the tip is pressed against the upper surface of the oil tank (2) and fixed. As a result, it is possible to prevent the tightening bolt (10) from loosening, and it is also a configuration that secures an appropriate compression allowance to prevent vibration and ensure sealing performance, so even if an amateur is working, a reliable anti-vibration effect Can be expected.

At this time, the flange (6) has an elastic flange (7a) at the top and bottom and an inner peripheral surface of the bush insertion hole (6a).
(7b) and elastic packing (8) supported by oil-absorbing pipeline (3)
And the oil tank (2) are insulated on the vibration surface. When the tightening bolt (10) is tightened, the elastic insertion portion (7b) starts
(7a) and the elastic packing (8) are elastically deformed, thereby preventing dust and water from entering the oil tank (2) from this portion.

When the hydraulic pump (1) is operated, the hydraulic oil (4) in the oil tank (2) is sucked through the strainer (13),
The oil is sucked into the hydraulic pump (1) through the oil absorption pipe (3).
At the same time, vibration is generated in the hydraulic pump (1), and the vibration is transmitted to the flange (6) through the oil suction pipe (3). As described above, the flange (6) is elastic in three directions: front, rear, left, right, up, and down.
(7) Since it is supported by (8), the vibration is absorbed and buffered, and is not transmitted to the oil tank (2) side. Also, since the flange (6) is fixed by the tightening bolt (10) which is threaded to the mounting seat (9) through the elastic members (7) and (8), there is no displacement due to vibration. .

[0019]

[Effects of the Invention] The oil pipe piping mounting structure of the present invention has the above-mentioned structure, so there is no problem in terms of cost and durability, and vibration from the variable pump is cut off to the oil tank. There is an advantage that there is no occurrence of low frequency vibration.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view of a pipe mounting structure for a pressure oil pipeline according to the present invention.

FIG. 2 is an exploded perspective view of a pipe mounting portion of the pressure oil pipeline of the present invention.

FIG. 3 is a partial cross-sectional view of a conventional pipe mounting structure for a pressure oil pipeline.

[Explanation of symbols]

 (1) Hydraulic pump (2) Oil tank (3) Oil absorption line (6) Flange (6a) Bush insertion hole (7) Elastic bush (7a) Elastic flange (7b) Elastic insertion part (8) Elastic packing (9) Mounting seat (10) Tightening bolt (11) Screw hole

Claims (1)

(57) [Scope of request for utility model registration] 1. A bush insertion hole formed in a flange of a mounting flange portion of an oil absorption line at a connection portion between an oil absorption line and an oil tank for connecting a hydraulic pump and an oil tank, and a bush insertion hole. An elastic bush having an elastic flange that comes into contact with the upper surface of the flange; an elastic packing disposed between the flange and the mounting seat of the oil tank; A pipe mounting structure for an oil-absorbing pipe, comprising a fastening bolt to be attached.