JPS621090Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to an oil tank used in a lubricating oil supply device that supplies lubricating oil to machine tools, etc.
More specifically, the present invention relates to a structure for attaching a lid to a tank body.

Generally, this type of oil tank consists of a box-shaped tank body with an open top and a lid that is removably attached to the tank body via screws, etc., but the conventional lid mounting structure is It was as shown in Figures 1 and 2. That is, the top of the side wall of the tank body 1 is bent inward or outward in a substantially L-shape to form a flat portion 2, and the lid 4 is placed on this through a gasket 3 and tightened with a male screw 5. ing. However, in this mounting structure, since the flat part 2, which is the receiving part of the lid body 4, is required to have a certain degree of mechanical strength, it is difficult to make the wall thickness thinner than necessary. Naturally, there was a limit to reducing the overall weight. Incidentally, the flat part 2
If the wall thickness of the tank body 1 including the tank body 1 is made thinner than the limit, distortion will occur in the flat part 2 due to local stress caused by tightening the male screw 5, and the sealing performance between the lid body 4 and the flat part 2 will deteriorate. There is a risk that it may be damaged. Furthermore, with the structure in which the flat portion 2 is bent inward of the tank body 1 as shown in FIG. 1, the tank body 1 cannot be manufactured by drawing, which is the simplest manufacturing method. On the other hand, in the structure shown in FIG. 2, the area occupied by the oil tank becomes larger due to the outward bending of the flat portion 2, which is not preferable in terms of miniaturization. Furthermore, although not shown, a method is known in which an angle member is spot welded to the inner surface of the side wall of the tank body 1 and the lid body 4 is screwed to this, but it is difficult to weld the angle member at an accurate position. However, there are drawbacks such as poor productivity.

This idea was created in view of the above-mentioned drawbacks, and its purpose is to reduce the weight of the tank body and lid by making them relatively thin, and to provide an oil tank with good productivity. There is a particular thing.

That is, this invention has a connecting fitting made of a metal block placed along the corner of the inner surface of the side wall of the tank body and the inner surface of the lid body, and the tank body and the lid body are screwed together via this connecting fitting. It is distinctive in that it is designed to stop.

Hereinafter, this invention will be described in detail with reference to an embodiment shown in the accompanying drawings.

As shown in FIG. 3, this oil tank 10 includes a tank body 11 and a lid 12 that is removably screwed to the upper opening of the tank body 11. The body 12 is provided with a motor 13 for driving a pump mechanism (not shown) and an electrical equipment box 14 serving as its control means, as well as an opening/closing cap 15 for an oil inlet. According to this invention, the tank body 11 and the lid 12 are screwed to each other via a connecting fitting 16 shown in FIGS. 4 to 6. That is, the connection fitting 16 is made of a metal block having a first joint end 18 that contacts the inner surface of the side wall 17 of the tank body 11 and a second joint end 20 that contacts the inner wall surface 19 of the lid body 12. , their respective joint ends 1
8 and 20 are provided with female screw holes 21 and 22. Correspondingly, the side wall 1 of the tank body 11
7 and the lid body 12 have the female screw holes 2, respectively.
1 and 22 are provided with screw insertion holes 24 and 25 for inserting male screws 23 and 23, but in this case, around the screw insertion holes 24 in the side wall 17,
It is a projection 26 that projects into the tank body 11 in a substantially trapezoidal shape (see FIG. 7).
Further, the area around the screw insertion hole 25 of the lid body 12 is a recessed portion 27 that is recessed upward into a substantially trapezoidal shape (see FIG. 8). On the other hand, regarding this
A positioning recess 28 that fits into the projection 26 is formed in the first joint end 18 of the connection fitting 16, and a positioning recess 28 is formed in the center of the bottom surface of the recess 28 around the screw insertion hole 24. An O-ring installation recess 30 for arranging an O-ring 29 is connected thereto. The second joint end 20 is sized to fit into the recess 27 of the lid 12, and its end surface 31 is appropriately rounded to improve sealing performance. ing. In addition,
Although only one connection fitting is shown in the figure, in an actual mounting structure, a plurality of connection fittings, for example four, are used, and correspondingly the tank body 1
A plurality of screw insertion holes 24 and 25 are also formed at appropriate locations in each of the side wall 17 and the lid 12 of 1. In this embodiment, the peripheral edge 32 of the lid 12 is bent downward into an L-shape as shown in the figure, and the lid 12 is placed over the tank body 11 with a rubber gasket 33 in between. It's getting old.

In the above configuration, this oil tank 10
For example, it is assembled as follows. First, a recess 30 formed around the opening of the female screw hole 21
The connecting fitting 16 is attached to the inner surface of the side wall 17 of the tank body 11 by fitting the O-ring 29 inside. In this case, by using the protrusion 26 as a guide and fitting the recess 28 into it, the connection fitting 16 can be attached to an appropriate position where the screw insertion hole 24 and the female screw hole 21 match. Then, the male screw 23 is screwed into the female screw hole 21, and the connecting fitting 16 is firmly fixed to the side wall of the tank body 11. Thereafter, a rubber gasket 33 is placed on the top of the side wall 17, the lid 12 is placed on top of the rubber gasket 33, and the male screw 23 is tightened into the female screw hole 22 through the screw insertion hole 25. In this manner, the oil tank 10 is assembled by attaching the lid 12 to the tank body 11. As is clear from the assembled state diagram of FIG. 4, since the O-ring 29 is arranged around the screw insertion hole 24 of the side wall 17, there is almost no possibility that oil will leak from this part. In addition, since the end surface 31 of the second joint end 20 is rounded, it closely fits into the recess 27 of the lid 12 to provide an effective sealing effect, and the screw insertion hole 2 on the lid 12 side
There is almost no oil leaking from 5.

As is clear from the description of the embodiments described above, according to this invention, the first joint end 18 contacts the inner surface of the side wall 17 of the tank body 11, and the second joint end portion 18 contacts the inner wall surface 19 of the lid body 12. A connecting fitting 16 made of a metal block including a joining end portion 20 and having female screw holes 21 and 22 formed in each of the connecting fittings 16 is attached to the side wall 17.
The through hole 24 of the side wall 17 and the lid 12 is attached to the corner where the inner wall surface 19 of the lid 12 intersects, and
25, insert the male screws 23, 23 into the female screw holes 21,
22 to connect the tank body 11 and the lid 12, the thickness of the tank body 11 and the lid 12 can be made thinner than before without weakening the connection strength. Weight reduction can be achieved. Furthermore, since the connecting fittings can be attached with a simple screw-fastening operation, assembly workability is good and productivity is also advantageous. Furthermore, this connecting fitting is highly versatile and can be applied to oil tanks of different sizes and shapes, and its effects are remarkable.

[Brief explanation of the drawing]

Figures 1 and 2 are cross-sectional views showing conventional examples;
Figures 3 to 8 all relate to embodiments of this invention, with Figure 3 being a perspective view of the oil tank, Figure 4 being a sectional view of essential parts showing the assembled state of the tank body and lid, and Figure 4 being a perspective view of the oil tank. Figure 5 is a perspective view of the connection fitting in Figure 4, Figure 6 is a sectional view taken along the - line, Figure 7 is a partial sectional view of the tank body, and Figure 8 is a partial sectional view of the lid. FIG. In the figure, 10 is an oil tank, 11 is a tank body, 12 is a lid, 16 is a connection fitting, 17 is a side wall,
18 is a first joint end, 20 is a second joint end,
21, 22 are female screw holes, 23 are male screws, 24, 2
5 is a screw insertion hole.

Claims (1)

[Scope of Claim for Utility Model Registration] An oil tank comprising a tank body with an open top and a lid detachably attached to the top opening of the tank body, a metal block formed to be disposed along a corner portion between the inner surface of the side wall and the inner wall surface of the lid body, the metal block including a first joint end portion in contact with the inner wall surface of the lid body and a second joint end portion in contact with the inner wall surface of the lid body; A female screw hole is formed in each of the first and second joint ends, and a male screw is inserted into the female screw hole from the outside of the side wall and the lid. An oil tank characterized in that the oil tank has a through hole for insertion therethrough, and the tank main body and the lid body are connected to each other via the connection fitting.