JPH0220532Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a packing with improved tightening and sealing properties, and more specifically to an improved shape of the packing.

Packing is used to create a seal by interposing the sealing part of two parts, but in the past, large packing with a complicated shape was used for relatively large sealing parts, such as oil pans used in automobile engines. With packing such as packing and valve cover packing, uniform tightening surface pressure cannot be obtained due to uneven tightening force when assembling, lack of precision of the cover member, etc. Especially when it is made by drawing a steel plate, it is difficult to obtain a uniform tightening surface pressure. If too much tightening pressure is applied, such as when using a cover member of It required great care and skill to obtain this, and was extremely poor in workability and stability.

A detailed description will be given below with reference to the drawings.

As a countermeasure for these drawbacks, as shown in Figure 1,
Protrusions 2 protruding lower than the thickness of the packing B are provided at multiple locations on the sealing surface 1 of the cover member A, and the protrusions 2
Packing B with a fitting hole 3 at the position where the
A device has been devised in which a cover member A is attached and tightened to prevent partial deformation of the cover member A due to over-tightening.

However, in the above structure, since the protrusion 2 is provided on the sealing surface 1 of the cover member A, the sealing surface 1 is easily distorted, resulting in a decrease in planar accuracy, and has serious drawbacks such as narrowing the sealing area of the packing B and reducing the sealing force.

The object of the present invention is to eliminate such drawbacks and provide a packing with a simple structure, which can prevent excessive tightening and apply uniform surface pressure to the packing B, and has high sealing performance.

As shown in Fig. 2, the present invention is a packing B' made of an elastic material such as cork, synthetic rubber, or synthetic resin, which has a plurality of holes 4 for attaching bolts, etc. At least one small hole 5 that is penetrating or non-penetrating is provided at a desired location between the bolt holes 4, and the small hole 5 is packed.
It is characterized by a structure in which a tightening thickness adjustment ball 6 having a diameter smaller than the thickness of packing B' and harder than packing B' is inserted.

The gist of this invention is to determine the appropriate tightening dimension of the packing B' using the tightening thickness adjustment ball 6, and the above structure makes it possible to apply the best possible tightening surface pressure to the packing B'. be.

In this structure, the small hole 5 provided in the packing B' does not matter whether it is penetrating or non-penetrating as long as it has a space in which the tightening thickness adjustment ball 6 can be inserted. The vicinity of the tool 7 is preferable because it can be expected to have a great effect as described later, but it is not particularly important.

The material of the tightening thickness adjusting ball 6 may be metal/ceramic, hard synthetic rubber, hard synthetic resin, etc.
It is required that the material be made of a material that does not easily change the outer diameter dimension even if it is tightened by the sealing member 8 and the sealing member 8.

When attaching the tightening thickness adjusting ball 6 to such a packing B' and tightening them, the cover member A first presses against the packing B' and compresses it, as shown in FIG. induces elastic deformation on the entire surface. At this time, the thickness of the packing B' that provides an appropriate amount of tightening force is set in advance, so it is optimal if the tightening thickness adjustment ball 6 with a diameter of this size is present in the packing B'. When the tightening pressure is obtained, the tightening thickness adjusting ball 6 comes into contact with the cover member A and the sealing member 8 to prevent further tightening. At this time, if the tightening thickness adjusting ball 6 is positioned near the tightening tool 7, the tightening force will be directly applied to the tightening thickness adjusting ball 6.
This prevents the cover member A from being distorted.

The compressive surface pressure obtained in this way maintains a smooth sealing surface 1 and maintains the optimum surface pressure without deforming the local part of the cover member A or aging the packing B' material due to over-tightening as in the conventional method. It also forms a stable and strong seal over a long period of time.

In this way, by using a hard ball with an unchanging diameter, it always shows the correct dimensions no matter how it is installed, eliminating any installation defects, and as mentioned above, there is no need for any precautions, so the installation work is easy. very good.

Furthermore, since the tightening thickness adjusting ball 6 is smaller than the packing B' thickness, the small hole 5 into which it is inserted need only be small so as not to reduce the sealing area, and furthermore, when inserted into the slit 5', the tightening The thickness adjusting ball 6 is firmly fitted into the slit 5' and fixed, eliminating the fear of it falling off.

As explained above, the present invention is an ideal packing that has a simple structure, greatly improves sealing performance and tightening performance, and also prevents material aging.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a conventional packing and cover member. FIG. 2 is a perspective view showing an embodiment of the packing of the present invention. FIG. 3 is a sectional view showing a state in which the packing of the present invention is installed. A... Cover member, B... Packing, 1...
Seal surface, 4...Mounting hole for bolts, etc., 5...Small hole, 6...Tightening thickness adjustment ball.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) In a packing made of an elastic material such as cork, synthetic rubber, or synthetic resin, which has multiple holes for bolts, etc., the bolt hole is inserted into each bolt hole. A packing characterized in that at least one small hole is provided at a desired location in the gap, and a tightening thickness adjustment ball having a smaller diameter than the packing thickness and harder than the packing is inserted into the small hole. (2) The packing according to claim 1, wherein the adjustment ball is a metal ball. (3) The packing according to claim 1, wherein the adjustment ball is a ceramic ball. (4) The packing according to claim 1, wherein the adjustment ball is made of hard synthetic resin or hard synthetic rubber. (5) The packing according to claim 1, wherein the small holes in the packing are slits.