JPH0743479Y2 - Washer for tightening bolt - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a washer for a tightening bolt suitable for use in the tightening bolt of a plate heat exchanger.

[Conventional technology]

Generally, the plate heat exchanger is repeatedly disassembled and assembled for cleaning and the like, and the tightening bolts used therein are also tightened and loosened.

Although a washer is used for the tightening bolt, a normal washer has a large frictional resistance, so that the tightening / loosening operation of the tightening bolt is not easy.

Therefore, intervening a metal thrust bearing,
A technique of interposing a resin washer is known.

[Problems to be solved by the device]

Those that use thrust bearings made of metal are costly, large in size and weight and difficult to handle, and the steel balls etc. of the bearings are steel and therefore rusty. There are drawbacks.

Further, the resin washer has a defect that the resin is deformed or damaged when a high tightening force is used and when it is used at a high temperature.

The present invention has been proposed in view of the above drawbacks of the prior art, and an object thereof is to provide a washer for a tightening bolt that does not require refueling, is inexpensive, and has low friction resistance. .

[Means for Solving the Problems]

In order to achieve the above object, the present invention is arranged so as to axially oppose a resin annular antifriction member having a low frictional resistance such as a fluororesin, and surrounds the antifriction member and holds the antifriction member. It is configured by combining two metal annular housing members.

In addition, the two metal annular housing members have the self-centering concave-convex portions on the surfaces facing each other in the axial direction.

Furthermore, an antifriction member sandwiched between the two metallic annular housing members is arranged between the axially facing surface and the radially facing surface.

[Action]

The tightening bolt washer according to claim 1 has a ring-shaped resin antifriction member having a low frictional resistance disposed between two metal ring-shaped housing members, so that the bolt tightening and loosening operations can be performed. At this time, the frictional resistance of the bearing surface against the washer of the nut is reduced. Moreover, refueling is unnecessary.

In the tightening bolt washer according to the second aspect, the two metal annular housing members are centered to each other by tightening the bolts, a uniform gap is secured in the radial direction of the housing members, and the friction is further reduced.

The tightening bolt washer according to claim 3 reduces the frictional resistance between the two metal annular housing members in the axial direction and the radial direction, and also prevents the radial displacement of both housing members.

〔Example〕

FIG. 1 to FIG. 6 are judgment views showing different embodiments of the tightening bolt washer according to the present invention.
The figure shows an annular recess (1) formed at the center of the axially opposing surfaces of housing members (1) (1) formed of a metal material in a rectangular annular cross section.
a) (1a) is formed, and resin-made annular antifriction members (2) and (2) having low frictional resistance such as fluorine resin are fitted into the annular recesses (1a) and (1a). In this case, the antifriction members (2) (2) have a thickness slightly larger than the depth of the annular recesses (1a) (1a), and when applied to the tightening bolts, the two housing members (1) (1) Are configured to make axial contact at the portion of the antifriction member (2) (2).

FIG. 2 is a modification of FIG. 1, in which the antifriction member (2) is fitted only on one housing member (1), and the antifriction member (2) and the other housing member (1). It is designed so that and are brought into axial contact with each other.

FIG. 3 is also a first modified example, in which the outer diameter of one housing member (1) is slightly increased, and the enlarged outer peripheral portion is axially moved to the other housing member (1) side. An outer flange portion (1b) is formed by extending annularly, and the other housing member (1) is fitted in the outer flange portion (1b) with a slight radial gap formed between the outer flange portion (1b) and the outer flange portion (1b). An annular groove is formed on the inner diameter surface of the portion (1b) and the outer diameter surface of the other housing member (1) so as to face each other, and a C-shaped split annular stopper ring (3) is formed between the both annular grooves.
Are integrally fitted in the axial direction, and annular recesses (1a) (1a) are formed at the centers of the surfaces of the housing members (1) (1) facing each other in the axial direction. Place (1a) (1a)
The friction-reducing members (2) and (2) are fitted to the opposing surfaces in the axial direction by slightly protruding so that the friction-reducing members (2) and (2) are in contact with each other.

FIG. 4 shows that the inner and outer peripheral parts of one housing member (1) are extended annularly in the axial direction toward the other housing member (1) to form an outer flange part (1b) and an inner flange part (1c). , The anti-friction member (2) and the other housing member (1) are fitted between the inner and outer flange portions (1b), (1b), and the outer diameter surface of the inner flange portion (1c) and the other housing member (1). ), An annular groove is formed so as to face the inner diameter surface, and a split annular stopper ring (3) of C-shape or the like is fitted between both annular grooves so as to be integrated in the axial direction. 1)
(1) is arranged so as to be opposed to and axially in contact with the friction reducing member (2).

FIG. 5 shows a concave and convex portion for self-centering (1d) (1
e) is formed, and the antifriction member (2) is fitted between the axially facing surfaces including the uneven portions (1d) and (1e), and the inner and outer circumferences of one housing member (1) Flange (1b)
(1c) is formed, and a stopper ring (3) is fitted between the inner diameter surface of the outer flange portion (1b) and the outer diameter surface of the other housing member (1).

FIG. 6 shows that inner and outer flange portions (1b) (1c) are provided on the inner and outer peripheral portions of one housing member (1), and a step portion radially inwardly extends on the inner peripheral portion of the other housing member (1). (1f) is formed, and the antifriction member (2) is arranged on the axially facing surface portion and the radially facing surface portion of both housing members (1) and (1). In this case, the antifriction member (2) facing the axial direction and the antifriction member (2) facing the radial direction may be separate or integrated.

As explained above, the tightening bolt washer of the present invention is
With the above configuration, the operation when applied to a tightening bolt will be described next.

In each of the embodiments, a combination of two metal annular housing members (1) (1) and an antifriction member (2) is used as one washer. In the embodiment, both housing members (1) and (1) are separated, but they are integrated in the embodiment shown in FIGS. 3 to 6 and can be handled as one part. Then, in each of the embodiments, when the bolts are tightened, the axially opposed surfaces of the housing members (1) and (1) come into contact with each other through the antifriction member (2), and the seat surface resistance is reduced to facilitate the operation. Can be tightened. Also, when the bolt is loosened, the seat surface resistance is reduced by the friction reducing member (2), and the loosening operation is facilitated. Further, in the embodiment of FIG. 5, the presence of the self-centering concave-convex portions (1d) and (1e) causes the two housing members (1) and (1) to be centered with respect to each other to ensure a uniform gap in the radial direction. We are working to further reduce friction. Further, in the embodiment shown in FIG. 6, friction is reduced in the axial direction and the radial direction.

In each of the above embodiments, the housing member (1) (1)
In addition to the usual metal materials used as washers, stainless steel or the like may be used when rust is to be avoided. Further, the shape of the housing member (1) (1) requires that the outer ends (1g) (1g) in the axial direction be flat, but as shown in FIG. 7, the contact surface of the nut (4) The housing (1) may be provided with a flange (1h) on the surface opposite to the surface of the housing, and the flange may be inserted into a bolt hole to center the washer in the bolt hole. In addition to the shapes shown in FIG. 3, combinations of these shapes and other shapes may be used.

[Effect of device]

According to the invention of claim 1, the tightening / loosening operation of the bolt can be carried out smoothly with a simple and inexpensive structure.
Since the anti-friction member is protected by the metal housing member, it is strong against high temperatures and high tightening pressures, and oil supply is not required. Therefore, plate heat exchangers that require repeated bolt tightening and loosening operations It is suitable for application to washers for tightening bolts.

According to the second aspect of the present invention, the two housing members can be centered to make the radial gap uniform, and the frictional resistance can be further reduced.

According to the invention of claim 3, there is an advantage that the frictional resistance between the two housing members in the axial direction and the radial direction can be reduced and the radial deviation can be prevented.

[Brief description of drawings]

1 to 6 are half cross-sectional views showing different embodiments of the tightening bolt washer according to the present invention, and FIG. 7 is another embodiment of the tightening bolt washer having a projection on one end surface. An example is shown. (1) (1) ... Two metal annular housing members,
(2) …… Anti-friction member, (3) …… Stopper ring.

Claims (3)

[Scope of utility model registration request] 1. Two metal annular housings, which are arranged opposite to each other in the axial direction, and which are made of a resin-made antifriction member having a low frictional resistance such as a fluororesin and which surrounds and surrounds the antifriction member. A washer for a tightening bolt, which is characterized by being combined with a member. 2. The washer for a tightening bolt according to claim 1, wherein the two metal annular housing members have concavo-convex portions for self-centering on the surfaces facing each other in the axial direction. 3. The antifriction member sandwiched between two metallic annular housing members is disposed between the axially facing surface and the radially facing surface. Washers for tightening bolts.