JPH0410425Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) This invention relates to a leaf spring for a disposable oil filter.

(Prior Art) Conventionally, a disposable oil filter as shown in FIG. 1 has been known. The oil filter 1 houses a leaf spring 5 and a filter body 4 in a cup-shaped container 2,
It is sealed with a cover plate 3 having an oil inlet and outlet. The filter body 4 is formed by sandwiching both ends of a cylindrical filter medium between a perforated end plate and a non-porous end plate, and a leaf spring 5 is inserted between the bottom surface of the container 2 and the non-porous end plate of the filter body 4. The filter body 4 is pressed against the cover plate 3 by interposing the filter body 4 therebetween. Leaf spring 5
A plate-shaped convex portion is provided at the center of the plate, which fits into a concave portion provided at the center of the non-porous end plate and serves as a positioning means to prevent the filter body 4 from tilting and the leaf spring 5 from being unbalanced. .

To manufacture such an oil filter, first insert the leaf spring 5 into the container 2 which is placed on its back in an upwardly convex position, then insert the filter body 4 into the leaf spring 5 with the non-porous end plate facing downward. The lid plate 3 is covered and pressed, and the plate spring 5 is crimped and fixed to the open end of the container 2 with the leaf spring 5 biased. Since these leaf springs are stored in piles, they are separated and supplied one by one during the above manufacturing process for assembly.

(Problem to be solved by the invention) The above-mentioned oil filter must be installed in a narrow space such as an engine room for use in automobile engines, and is required to be miniaturized, so the leaf spring is strong with a small amount of deflection. It is required to have a spring force and exert a required pressing force on the filter body. Therefore, in order to increase the spring force, the applicant has proposed a rectangular leaf spring that also has curvature in the short side direction [Utility Application No. 56-
No. 63193 (Jitko No. 59-39446)].

When manufacturing oil filters, it is desirable to smoothly supply such leaf springs one by one.
These leaf springs are stacked one on top of the other during storage, and are stuck together due to oil adhesion during leaf spring molding, making it difficult to remove each leaf one by one when supplying the leaf springs and interfering with the operation of automatic assembly machines. There is a problem that it may cause In particular, the leaf spring of the present invention has a curvature in the short side direction, so it has a stronger spring force than the conventionally known leaf spring with no curvature in the short side direction, contributing to the miniaturization of the oil filter. On the other hand, even if the overlapping leaf springs are shifted, the curved surfaces will slide against each other while maintaining a close contact state, and it will be difficult to separate the leaf springs one by one.

(Means for Solving the Problem) In the leaf spring of a disposable oil filter, which has an approximately rectangular shape, is arched in the long side direction, and has a curvature in the short side direction, a flat plate-like shape is placed in the center with the curved surface facing outward. This is a leaf spring for a disposable oil filter, which is provided with a convex portion, and has an opening having a substantially perpendicular hole flange in the inward direction of the curved surface in the center of the flat portion of the top surface of the convex portion.

(Function) This leaf spring is interposed between the bottom surface of the container of the disposable oil filter and the end plate of the filter body, and presses and fixes the filter body. This leaf spring has a flat plate-shaped convex part in the center, and has a flat part and a step part around it that serves as a reinforcing rib, so these can sufficiently overcome the lack of rigidity caused by the opening provided in the center of the flat part. This is compensated for without compromising the strong spring force of this leaf spring. In addition, the hole flange provided at the opening in the center of the flat part is formed on the periphery of the opening, so it can be formed almost vertically without being inclined, and by butting this part, the board This prevents springs from coming into close contact when stacked on top of each other. This hole flange faces the inner surface of the curvature, and does not interfere with pressing the concave portion of the end plate with the flat portion of the convex portion.

(Example) Examples are shown in FIGS. 3 and 4. The leaf spring 15 is used as the leaf spring 5 of the disposable oil filter 1 as illustrated in FIG. 1, and is assumed to have a curvature also in the shorter side direction as described above. The leaf spring 15 has a substantially rectangular shape, and short side portions 15a at both ends are flat in an arc shape along the shoulder of the bottom surface of the cup-shaped container.
It is arched in the long side direction except for both short sides 15a. The leaf spring 15 has a convex portion 15b formed at the center of the curved surface that projects outward from the curved surface, and the top surface of the convex portion 15b forms a flat portion 15d surrounded by a stepped portion 15e.
The convex portion 15b fits into the concave portion of the non-porous end plate of the filter body 4 (FIG. 1) for positioning. An opening having a hole flange 15c that is substantially perpendicular to the inward direction of the curved surface is bored in the center of the flat portion 15d of the convex portion 15b. (FIG. 4A) or hole flange 15c' shown in FIG. 4B, the shape of the hole flange may be widened and warped.

The convex portion 15b at the center of the leaf spring 15 is the stepped portion 1.
5e and the flat part 15d, the flat part 1
Even if there is an opening in the center of 5d, the rigidity will not be insufficient. In addition, since the step part of the convex part 15b has a flat part in the center, it is difficult to rise vertically, but it becomes an inclined surface, which promotes close contact between the leaf springs and tends to prevent the leaf springs from peeling off one by one. Since the peripheral hole flange 15c can be formed almost vertically,
Can prevent close contact.

(Effect of the invention) The leaf spring of this invention has a curvature in the short side direction as well, which prevents the overlapping condition that is promoted by the hole flange of the opening provided in the center of the flat part of the convex part. Since the leaf spring is
This eliminates the need to peel off the leaf springs one by one, improving workability during manufacturing, and making it easier to automatically feed the leaf springs. Incidentally, the means for preventing adhesion by the hole flange cannot be achieved by the stepped portion at the periphery of the convex portion. This is because the convex part has a flat top surface to maintain the rigidity of the leaf spring, and the stepped part is not the opening edge, so it does not rise vertically during molding, but has an inclination, and does not overlap. This is because they become in close contact and become a hindrance when being shifted and peeled off.

The strong spring force of this leaf spring does not impede miniaturization of the oil filter because even if there is an opening in the center, the rigidity is sufficiently supplemented by the convex portion. Moreover, since the hole flange prevents the entire surface of the leaf spring from coming into close contact, handling during manufacture is facilitated, and the effect on production efficiency is also significant.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of a disposable oil filter.
FIG. 2 is a diagram showing the state of close contact between the leaf springs, FIG. 3 is a perspective view of the leaf spring of this invention, and FIGS. 4A and 4B are cross-sectional views of the leaf spring of this invention. FIG. 5 is a diagram showing the overlapping state of the leaf springs of this invention. 5, 15...Plate spring, 15b...Protrusion, 15
c, 15c'...Hole flange.

Claims (1)

[Scope of utility model registration request] In the leaf spring of a disposable oil filter, which is approximately rectangular and arched in the long side direction and curved in the short side direction to form a gently curved surface, the leaf spring has a step part in the center that protrudes outward from the curved surface. Disposable oil comprising a plate-shaped convex portion having a flat portion on the top surface, and an opening having a hole flange rising almost vertically inward of the curved surface in the center of the flat portion of the convex portion. Leaf spring for filter.