CN1165260A

CN1165260A - O-ring of multi-lobular cross section

Info

Publication number: CN1165260A
Application number: CN 96107209
Authority: CN
Inventors: 益冈照明
Original assignee: Individual
Current assignee: Individual
Priority date: 1996-05-10
Filing date: 1996-05-10
Publication date: 1997-11-19

Abstract

A O ring of multi-lobular cross section has five to ten lobular lugs formed along the periphery of and integral with a body of the O ring. The lugs are disposed symmetrical with each other and arranged at regular angular intenals in cross section, so that the two or three of the lobular lugs are kept in a sliding contact with each of inner and outer walls defining the groove in which the O ring is compressed. Stress imparted by the walls is distributed to be symmetrical with respect to a diametrical center line of the O ring and each lug is of a sufficient size to improve resistance to frictional abrasion.

Description

The O shape ring of leafy sheet cross section

The present invention relates to a kind of O shape ring with leafy sheet cross section, this O shape ring is suitable for sealing some and is present in gap between the mechanical parts etc.

As shown in Figure 8, usually, such O shape ring 7 is annular on its plane view.Fig. 9 is a cross section of obtaining along the IX-IX line among Fig. 8, and it has shown that the cross section of these O shape rings is circular.Figure 10 (b) illustrates this O shape ring 7 and is compressed in a situation among the groove 4 in the gap that is formed between the part in use.Cross section is that oval-shaped O shape ring just has very big and surfaces inside-and-outside ring wall 5 and 6 rubbing contact like this.Figure 10 (a) and 10 (c) have shown the stress distribution that is added on inside and outside wall 5 and 6 respectively.Under inside and outside wall 5 and 6 counterrotating situations, powerful frictional force is with this O shape ring of rapid wearing.This problem is caused by existing surface contact mechanism in traditional O shape ring.Therefore, the present invention proposes a kind of O shape ring (seeing Japanese unexamined patent publication number No.5-39870) of line contact structure form.According to this proposal, encircle " small leaf " of a plurality of annulars of moulding integrally along the circumference of this O shape ring and with this O shape.In a typical embodiment, this improved O shape ring has 12 or more this small leaf, so its cross section is the colored shape of " many lobes ".

Yet it is superfluous that the quantity of small leaf that stretches out from improved O shape ring and circular flange is considered to.A lot of flanges and trench wall keep sliding contact, and improved like this O shape ring is similar to traditional O shape ring on performance.Guarantee that it is difficult that these small leaf flange configurations are become the diameter center line symmetry with respect to O shape ring.Therefore, these flanges unexpectedly are subjected to uneven wearing and tearing sometimes.

Therefore an object of the present invention is to provide a kind of O shape ring of leafy sheet cross section, this O shape ring has been broken away from the O shape circular or leafy sheet cross section in the prior art and has been encircled existing problem.Especially, the present invention wants to provide a kind of O shape ring of being made up of the flange of circular and leaflet sheet, this flange encircles moulding integrally along the circumference of this O shape ring and with this O shape, like this, only there are two or three such flanges symmetrical, and keeping one in the inside and outside annular wall with an annular groove of formation to contact, this annular groove is formed in the gap between the mechanical parts etc.

According to the present invention, this O shape ring has the cross section of a leafy sheet and is selected from one group of rubber and elastomeric material is made by a kind of, this O shape ring has 5-10 to encircle the small leaf flange of moulding integrally along the circumference of O shape ring and with this O shape, and wherein these flanges are configured to arrange symmetrically and with certain angle intervals on a diameter cross.

The height (definition later on) that also has each flange of important characteristic to the ratio of wide (also definition afterwards) in 0.3 to 1.2 scope.The too elongated flange that is not included in this scope can fall down when being compressed at the O of these many small leaf shape ring, will make this O shape ring similar to the O shape ring (as shown in Figure 8) of circle on function and be not included in said scope with the flange of interior undue tubbiness.

In use, this O shape ring is compressed in the groove of an annular, and is a kind of like this state, and promptly two or three flanges keep a wall in the inside and outside wall with this groove of formation to contact slidably.Thereby the stress distribution that is added to O shape ring by wall becomes a diameter center line symmetry of encircling with respect to this O shape.The flange dimension that the size of each flange is all encircled greater than the multiple-blade O shape in the prior art, and improved its antiwear property.

Fig. 1 is the fragmentary, perspective view of O shape ring in first embodiment and that partly shown its cross section, and it is corresponding to the I part among Fig. 8;

Fig. 2 (a) shows to be added in as shown in Figure 1 O shape to encircle stress envelope on the contacted outer wall;

Fig. 2 (b) is the in use compressed cross section of O shape ring shown in Figure 1;

Fig. 2 (c) shows to be added in as shown in Figure 1 O shape to encircle stress envelope on the contacted inwall;

Fig. 3 is the cross section of another O shape ring in a second embodiment;

Fig. 4 is the fragmentary, perspective view of O shape ring in a second embodiment, and the mode of its demonstration is similar to Fig. 1;

Fig. 5 is the fragmentary, perspective view of the O shape ring in the 3rd embodiment, and the mode of its demonstration is similar to Fig. 1;

Fig. 6 (a) shows to be added in as shown in Figure 5 O shape to encircle stress envelope on the contacted outer wall;

Fig. 6 (b) is the in use compressed cross section of O shape ring shown in Figure 5;

Fig. 6 (c) shows to be added in as shown in Figure 5 O shape to encircle stress envelope on the contacted inwall;

Fig. 7 is the fragmentary, perspective view of the O shape ring in the 4th embodiment, and the mode of its demonstration is similar to Fig. 1;

Fig. 8 is the plane view of the O shape ring of a prior art;

Fig. 9 is a resulting cross section of IX-IX line along Fig. 8;

Figure 10 (a) shows that the O shape be added in prior art is encircled the stress envelope on the contacted outer wall;

Figure 10 (b) is the in use compressed cross section of O shape ring of prior art; And

Figure 10 (c) shows that the O shape be added in prior art is encircled the stress envelope on the contacted inwall;

Now, by coming the explanation detailed in addition with reference to the accompanying drawings to some embodiments of the present invention.

In Fig. 1, on its cross section, has sinusoidal external form usually according to first embodiment's O shape ring 2.Article 6, small leaf flange 1a, 1b, 1c make two flange 1c wherein be configured in its top and bottom respectively with certain angle intervals configuration.Between adjacent flange, formed the depression 3 of a bending.In this depression, will keep a large amount of lubricant oil, thereby make this O shape ring energy selflubricating.

In use, two inward flange 1a of this O shape ring will be pressed against on the inwall 5 of annular groove 4, as shown in Figure 2.Similarly, two outward flange 1b are compressed and contact slidably with outer wall 6, thereby loosely close groove 4.For example, this groove can be formed in and be looped around on a rod or the similar solid column part 4a.Correspondingly, outer wall can be that part that surrounds sleeve pipe or the similar hollow cylinder part 6a of said column part 4a.The stress that is added on the O shape ring will distribute in the mode of figure shown in Fig. 2 a and the 2c.This shows, be inserted in interior or the flange 1a that outer wall contacts and the bottom of the depressed area 3 between 1a or 1b and the 1b and generally do not contact with wall.

Another O shape ring that is provided in a second embodiment as shown in Figure 3.The cross section of this O shape ring is similar to the cross section of first O shape ring, but its small leaf flange 1d, 1e, 1f, 1g, 1h compares the angular displacement that 30 degree are arranged with 1j with first embodiment's O shape ring.In use, innermost flange 1d and contact with trench wall 5 (not showing) with 1f with two side flange 1e that this flange matches.Similarly, outermost flange 1g and two adjacent flange 1h thereof contact with outer wall 6 with 1j.The distribution of pressure is identical with the mode shown in the top of Fig. 6.

Fig. 5 has shown the 3rd embodiment, five small leaf flange 1k and O shape ring global formation is wherein arranged and round this O shape ring.Wherein two flange 1k will contact with inwall 5, and other three flanges contact with outer wall 6.The top and the bottom of stress distribution such as Fig. 6 institute is not in this case.

The 4th embodiment's four who shows in Fig. 7 O shape ring comprises 8 small leaf flange 1m that encircle global formation and encircle round this O shape with O shape.In this embodiment, the interior and outer wall 4 of annular groove 4 all contacts with three flange 1m with 5.Stress also is to distribute in the mode shown in the top of Fig. 6.

In each embodiment, two or three small leaf flanges contact at the interior and outer wall of its locational annular groove with holding and keep O shape ring.These two or three s' flange is symmetrical, thereby when using this O shape ring the uneven wearing and tearing of flange will can not take place.These flanges contact the sealing effect of having strengthened this O shape ring with the line of said trench wall.

Should be noted that if the O shape of a plurality of small leaf ring only has 4 flanges on its cross section then will make two or more flange is difficult with interior the contact with outer wall.Therefore, the quantity of this flange should be 5 or more.Yet 12 or more flange will make this O shape ring similar to the O shape ring of the circular cross section of prior art on function.Like this, the quantity of small leaf flange should be 10 or still less, and better is 8 or still less, so that make.

As shown in Figure 3, the height of every flange " H " can be defined as summit " S " to the radial distance between the inscribed circle " C ".Reference symbol " O " is the center of this inscribed circle " C ".On the other hand, the width of every flange " W " can be defined as tangent line " T " by that section that external frame cut of flange.Though " H " is designed to about 0.8 the ratio of " W " in all the above embodiments, this ratio can change in 0.3 to 1.2 scope.The flange of too elongated and undue tubbiness is owing to above-described reason all is unfavorable.Under each flange 1a " H/W " was worth near 0.3 situation, in use the bottom in bent recess district 3 may contact the wall of groove 4, but this can not produce adverse influence to the expectation function of O shape ring.

In a word, the O shape of a plurality of small leaf ring is compressed in the annular groove by this way: i.e. interior the and outer wall sliding contact of its two or three flanges and this groove.Pressure stress distributes in O shape ring symmetrically, thus a more weak compression with regard to its sealing function of sufficient to guarantee, thereby caused wearing and tearing during relatively moving when having reduced or vertically by the relatively rotating of said wall.Certainly, under being static situation, also can use furrow bank this O shape ring.

Claims

O shape ring 1 one kinds of leafy sheet cross sections and that make by one group of rubber and elastomer, this O shape ring on diameter cross, have 5 to 10 along the circumference of this O shape ring and with the small leaf flange of this O shape ring global formation, it is characterized in that: these flanges are arranged symmetrically and with certain angle intervals.
2 O shapes according to claim 1 ring is characterized in that: the configuration of these flanges makes when use is compressed in an O shape ring in the annular groove, and two or three small leaf flanges keep contacting slidably with the inside and outside wall of formation groove.
3 O shapes according to claim 2 ring is characterized in that: the height of each flange to the ratio of its width in 0.3 to 1.2 scope.