JPH032729Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a packing with improved tightening and sealing properties, and more specifically, the invention relates to packing with improved tightening and sealing properties, and more specifically, inserting a tightening adjustment washer into a bolt hole to control the amount of compressive deformation of a gasket. Regarding improvements to packing that regulates.

[Conventional technology]

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 during assembly and lack of precision of the cover member. If too much tightening pressure is applied, such as when using a cover member of It required great attention and skill to obtain this, and the workability and stability were extremely poor.

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

As a countermeasure to this drawback, as shown in Figure 5,
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.

[Problem that the invention attempts to solve]

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.

[Means for solving problems]

As shown in Fig. 1, the present invention is a packing B1 made of an elastic material such as cork, synthetic rubber, or synthetic resin and having a plurality of mounting holes 4 for bolts, etc., and one side of a washer C having bolt holes 4a. At least one protrusion 5 is provided on the surface, and the height of the protrusion 5 is within a range that does not exceed the thickness of the packing B1 together with the thickness of the washer C, and the height of the protrusion 5 is within the range of the thickness of the packing B1. A washer fitting recess 6 for fitting a washer C having almost the same shape as the washer C to the periphery of the mounting hole 4, and a through hole extending in the thickness direction at the location where the protrusion 5 of the washer C is located. The packing B1 provided with the hole 7 is
A feature is that the washer C is fitted into the washer fitting recess 6 and the through hole 7 and integrated. Washer fitting recess 6 of this packing B1
The shape of the through hole 7 is such that a washer fitting recess 6 having a shape substantially similar to that of the washer C is provided on one side of the mounting hole 4 for a bolt, etc.
A through hole 7 penetrating through to the other surface is formed at a location where the protrusion 5 is located inside.

The material of the washer C is preferably a hard material such as metal, ceramic, hard synthetic rubber, or hard synthetic resin, and is a material that does not easily change its thickness even when it is pressed between the cover member A and the sealing member 8. It is required that

[Effect]

The gist of this invention is to determine the appropriate tightening dimensions of the packing B1 using the washers C and the protrusions 5, and this structure makes it possible to apply the best possible tightening surface pressure to the packing B1.

That is, the packing B1 to which the washer C is attached is attached to the sealed location, and then the bolt 9 is tightened.
When tightening, as shown in FIG. 2, the cover member A first presses against the packing B1 and compresses it, gradually inducing elastic deformation over the entire surface of the packing B1. At this time, the thickness of the packing B1 that provides an appropriate amount of tightening force (generally, the best compression ratio is 20% to 40%) has been set in advance, so the thickness that provides the appropriate compression ratio is determined in advance. If the washer C having the protrusion 5 preformed in thickness is present in the packing B1, the cover member A will be removed when the optimum clamping pressure is obtained.
and the back surface of the washer C and the protrusion 5 to the sealing member 8.
makes contact with the top of the cap and prevents further tightening.
(Figure 2 shows the state before tightening with the bolt.) This means that when the bolt 9 is screwed in, the washer C and the protrusion 5 in the packing B1 prevent the bolt 9 from rotating. All you have to do is tighten it until it stops, and that alone provides the best clamping pressure for Packing B1, so it can be installed accurately and in a short time without any of the troublesome work of conventional delicate adjustments or additional tightening. . Of course, if the above-mentioned contact is not made, it means that the tightening force is weak and the sealing force is insufficient, so it is important to tighten until it makes angular contact with the rabbit and prevents rotation.

The compressive surface pressure thus obtained maintains a smooth sealing surface 1 and has an optimum surface pressure without deforming the local part of the cover member A or aging the packing B1 material due to over-tightening as in the conventional case. It forms a stable and strong seal over a long period of time.

By using an insert whose thickness does not change in this way, it always shows the proper tightening dimension no matter what state it is attached to, eliminating the problem of insufficient tightening of the packing B1.

In addition, in FIG. 1, the protrusion 5 is provided on the outer periphery of the washer C, but as shown in FIG.
It may be provided on the inner circumferential portion continuous to the inner circumferential portion, and of course, the function and effect will not change even if it is provided on the central portion (between the inner and outer circumferential portions). However, if the protrusion 5 is provided on the inner circumference as shown in Fig. 3, packing B1
The holes 4 for attaching bolts and the like and the through holes 7 are connected integrally to produce the effect of facilitating molding.

〔Example〕

FIG. 4 shows another embodiment of the present invention,
In this embodiment, the washer C is punched out from a metal plate of a suitable thickness and bent to form the protrusion 5. This shape suggests that it should be formed from a steel plate, which is very cheap in material cost and has good formability, but other metals may also be used as long as they provide the same effect as the steel plate material. It's not a thing.

[Effect of idea]

As explained above, the present invention greatly improves tightening workability with a simple structure, and also prevents deformation of the cover member to obtain uniform and accurate tightening pressure, thereby preventing material aging due to local tightening fatigue. This is an innovative packing with a washer that has many excellent effects such as preventing

[Brief explanation of drawings]

FIG. 1 is a partially cutaway perspective view of the packing of the present invention and a perspective view of the washer. FIG. 2 is a sectional view showing a state in which the packing with a washer according to the present invention is installed and is not tightened. 3 and 4 are perspective views showing other embodiments of the washer of the present invention. FIG. 5 is a partial perspective view of a conventional packing and cover member. A... Cover member, B... Packing, C...
Washer, 4... Bolt etc. mounting hole, 5... Projection, 6... Washer fitting recess, 7... Through hole, 8... Sealing member, 9... Bolt.

Claims (1)

[Claims for Utility Model Registration] (1) In a packing made of an elastic material such as cork, synthetic rubber, or synthetic resin and having multiple holes for attaching bolts, etc.; , a washer provided with at least one protrusion that protrudes within a range that does not exceed the thickness of the packing together with the washer thickness;
A washer fitting concave portion having a shape substantially the same as that of the washer and a through hole provided in the thickness direction at a location where the protrusion is located in the bolt etc. mounting hole of the packing, and a washer fitting recess of the packing. A packing with a washer that features a structure in which the washer is fitted into a through hole. (2) The packing with a washer according to claim 1, wherein the washer and the protrusion are made of a material having sufficient rigidity that is at least harder than the packing.