JPS6141471Y2 - - Google Patents
Info
- Publication number
- JPS6141471Y2 JPS6141471Y2 JP15200981U JP15200981U JPS6141471Y2 JP S6141471 Y2 JPS6141471 Y2 JP S6141471Y2 JP 15200981 U JP15200981 U JP 15200981U JP 15200981 U JP15200981 U JP 15200981U JP S6141471 Y2 JPS6141471 Y2 JP S6141471Y2
- Authority
- JP
- Japan
- Prior art keywords
- valve
- valve body
- protrusion
- valve seat
- seat
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000012856 packing Methods 0.000 claims description 12
- 238000004880 explosion Methods 0.000 claims description 7
- 239000002184 metal Substances 0.000 claims description 5
- 239000013013 elastic material Substances 0.000 claims description 3
- 230000002265 prevention Effects 0.000 claims description 2
- 230000002093 peripheral effect Effects 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000005266 casting Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
Landscapes
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
- Safety Valves (AREA)
Description
【考案の詳細な説明】
本考案はクランクケース爆発防止安全弁に関す
る。[Detailed Description of the Invention] The present invention relates to a crankcase explosion prevention safety valve.
一般にこの種の安全弁は、クランクケース内で
爆発が生じたときに瞬時に開いてクランクケース
内の空気を逃がすと共に、開弁後はすぐに閉じて
外部からクランクケース内への空気の流入を防
ぎ、二次的な爆発を避ける役目をもつている。と
ころが従来の安全弁は第３図に示すようにクラン
クケース側蓋３１に固着される金属製弁シート３
２に、断面形状が略三角形状の環状シート部３３
が一体に形成され、鋳物製の弁体３４に、シート
側の面が平らな環状のゴムパツキン３５が焼き付
けられている。そのため弁ばね３６の弾発力によ
りシート部３３に押し付けられているゴムパツキ
ン３５にはシート部３３に対応する環状の凹部
（へたり）３８ができてしまう。従つて安全弁が
一旦開いて再び閉じたときに、シート部３３と環
状凹部３８がずれてしまうと、シート部３３とパ
ツキン３５の間に部分的に隙間が生じ、クランク
室３７を密封できず、クランク室３７の油が漏れ
るという不具合があつた。 In general, this type of safety valve opens instantly when an explosion occurs inside the crankcase, allowing the air inside the crankcase to escape, and closes immediately after opening to prevent air from entering the crankcase from outside. , has the role of preventing secondary explosions. However, as shown in FIG. 3, the conventional safety valve has a metal valve seat 3 fixed to the crankcase side cover 31.
2, an annular sheet portion 33 having a substantially triangular cross-sectional shape;
are integrally formed, and an annular rubber gasket 35 with a flat surface on the seat side is baked onto the cast valve body 34. Therefore, an annular recess 38 corresponding to the seat part 33 is formed in the rubber packing 35 which is pressed against the seat part 33 by the elastic force of the valve spring 36. Therefore, when the safety valve opens and closes again, if the seat portion 33 and the annular recess 38 are misaligned, a gap will partially occur between the seat portion 33 and the gasket 35, and the crank chamber 37 will not be sealed. There was a problem with oil leaking from the crank chamber 37.
また上記のような環状凹部３８とシート部３３
がずれるのを少しでも解消するために、弁ガイド
３９が備えられてはいるが、部品点数が多くな
り、しかも弁体３４にボス部４０を設けて精密な
ガイド孔４１を加工しなければならず、そのうえ
ガイド孔４１を有するために簡単なプレス加工で
製作することがむずかしく、鋳物で弁体３４を製
造する必要があつた。従つて材料コストや製造コ
ストが高くつき、またパツキン３５の環状凹部３
８とシート部３３が着座時にずれるのを完全に解
消することも困難であつた。 In addition, the annular recess 38 and the seat portion 33 as described above
Although a valve guide 39 is provided in order to eliminate the misalignment, the number of parts increases, and furthermore, a boss portion 40 must be provided on the valve body 34 and a precise guide hole 41 must be machined. Moreover, since it has the guide hole 41, it is difficult to manufacture it by simple press working, and it is necessary to manufacture the valve body 34 by casting. Therefore, the material cost and manufacturing cost are high, and the annular recess 3 of the packing 35 is
It has also been difficult to completely eliminate the misalignment between the seat part 33 and the seat part 8 when the seat is seated.
また第４図に示すようにシート５０側に断面形
状が円形のＯリング５１を接着した安全弁も開発
されているが、Ｏリング５１ではＯリング５１と
金属製弁体５２の間の弁中心側（第４図の上側）
の部分Ａに油が溜まり、しかも弁ばねの弾性力の
みによるＯリング５１の円弧状表面と弁体５２の
接触では、接触面積は割に広くなる反面Ｏリング
５１と弁体５２との当たりが鈍くなり、上記部分
Ａに溜まる油の漏出を完全に防止することができ
なかつた。 As shown in FIG. 4, a safety valve has been developed in which an O-ring 51 with a circular cross section is bonded to the seat 50 side. However, the O-ring 51 is attached to the center of the valve (upper side in FIG. 4) between the O-ring 51 and the metal valve body 52.
Oil accumulates in portion A, and further, when the contact between the arcuate surface of O-ring 51 and valve body 52 is caused only by the elastic force of the valve spring, the contact area between O-ring 51 and valve body 52 becomes relatively large, but on the other hand, the contact between O-ring 51 and valve body 52 becomes weak, and it is not possible to completely prevent the leakage of the oil accumulated in portion A.
本考案は上記のような不具合を解消するもので
あつて、その目的は、(1)部品点数の削減及び製造
加工の容易化ならびにコストダウン、(2)安全弁か
らの油漏を確実に防止することである。以下図面
に関連して本考案を説明する。 The present invention is intended to eliminate the above-mentioned problems, and its objectives are (1) to reduce the number of parts, facilitate manufacturing and processing, and reduce costs; (2) to reliably prevent oil leakage from the safety valve. That's true. The invention will be explained below in conjunction with the drawings.
クランクケースの縦断面部分図である第１図に
おいて、クランクケース１にはクランク室４内を
点検するための窓孔２が形成されると共に、窓孔
２を覆う側蓋３が着脱自在に固着されており、側
蓋３の弁用窓孔５を覆うように安全弁６が側蓋３
に取り付けられている。 In FIG. 1, which is a vertical cross-sectional partial view of the crankcase, a window hole 2 for inspecting the inside of the crank chamber 4 is formed in the crankcase 1, and a side cover 3 covering the window hole 2 is removably fixed. The safety valve 6 is attached to the side cover 3 so as to cover the valve window hole 5 of the side cover 3.
is attached to.
安全弁６は環状の弁シート７、弁体ホルダー
８、弁体９及び環状の弁座パツキン１０等からな
つている。弁シート７はその外周端部分が複数本
のボルト１１により側蓋３に固着されている。弁
体ホルダー８は有底筒形に形成されると共にフラ
ンジ部１２を一体に備えており、複数本のボルト
１３及び筒形のスペーサ１４により弁シート７か
ら間隔ｄを隔てて弁シート７に固着されている。
弁体ホルダー８はプレス加工により成形されてい
る。弁体９は弁体ホルダー８よりの小さい直径の
有底筒形に形成されており、段部１７と平板状の
当接部（フランジ部）１６を一体に備えている。
弁体９は弁体ホルダー８内に配置されており、段
部１７と弁体ホルダー８の底壁の間に縮設された
弁ばね１５の弾性力により当接部１６が弁座パツ
キン１０に着座している。弁体９はプレス加工に
より成形されている。 The safety valve 6 consists of an annular valve seat 7, a valve body holder 8, a valve body 9, an annular valve seat packing 10, and the like. The outer peripheral end portion of the valve seat 7 is fixed to the side cover 3 with a plurality of bolts 11. The valve body holder 8 is formed into a cylindrical shape with a bottom and integrally includes a flange portion 12, and is fixed to the valve seat 7 at a distance d from the valve seat 7 by a plurality of bolts 13 and a cylindrical spacer 14. has been done.
The valve body holder 8 is formed by press working. The valve body 9 is formed into a bottomed cylindrical shape with a diameter smaller than that of the valve body holder 8, and integrally includes a step portion 17 and a flat contact portion (flange portion) 16.
The valve body 9 is placed in the valve body holder 8, and the contact portion 16 is pressed against the valve seat packing 10 by the elastic force of the valve spring 15, which is compressed between the stepped portion 17 and the bottom wall of the valve body holder 8. Seated. The valve body 9 is formed by press working.
弁座パツキン１０は耐油弾性ゴムでできてお
り、その弁体側の内周端部分には弁体側へ突出す
る環状の突起部１８が形成されている。 The valve seat packing 10 is made of oil-resistant elastic rubber, and has an annular protrusion 18 projecting toward the valve body at its inner peripheral end portion on the valve body side.
第１図にイ部分の拡大断面図である第２図にお
いて、突起部１８の弁体側（第２図右側）への張
出幅ｌはパツキン外周端側（第２図下側）からパ
ツキン内周端側へゆくに従い大きくなつており、
突起部１８の弁体側のバツキン内周側の端縁２０
は角張つている。 In FIG. 2, which is an enlarged cross-sectional view of the part A in FIG. It becomes larger toward the peripheral edge,
Edge 20 on the inner peripheral side of the valve body side of the protrusion 18
is angular.
クランク室４で爆発が起こつたときには、爆発
の圧力により瞬時にして弁体９が開き（第１図の
仮想線の状態）、クランク室４の空気を、弁座パ
ツキン１０と当接部１６の間及び弁シート７とフ
ランジ部１２の間を通して外部へ逃がす。クラン
ク室の圧力低下後はすぐに閉じて外部からクラン
ク室４への空気の流入を防ぎ、クランク室４内で
の二次爆発を防止する。 When an explosion occurs in the crank chamber 4, the pressure of the explosion instantly causes the valve body 9 to open (as shown by the imaginary line in FIG. and between the valve seat 7 and the flange portion 12 to escape to the outside. After the pressure in the crank chamber is reduced, it is immediately closed to prevent air from flowing into the crank chamber 4 from the outside, thereby preventing a secondary explosion within the crank chamber 4.
前記のように突起部１８はその張出幅ｌが内周
端側へゆくに従い大きくなつており、内周側端縁
２０が角張つているのが、突起部１８と当接部１
６の間に従来（第４図）のように油が溜ることが
なくなると共に、端縁２０と当接部１６は線接触
的に強く接触する。従つてクランク室４からの油
漏れを確実に防止することができる。また突起部
１８はゴム製の弁座パツキン１０に一体に形成さ
れているので、平板状の金属製当接部１６には従
来例（第３図）で説明したような環状の凹部３８
ができることはなく、従つて一旦開弁した後に閉
じたときに、たとえ突起部１８に対する当接部１
６の位置が開弁前の着座位置からずれていても、
当接部１６と突起部１８との間に部分的な隙間が
生じることはなく、油漏れの必配がない。 As mentioned above, the projecting width l of the projection 18 increases toward the inner peripheral end, and the inner peripheral edge 20 is angular because the projection 18 and the contact part 1
Unlike the conventional case (FIG. 4), oil does not accumulate between the edges 20 and the contact portion 16, and the edge 20 and the contact portion 16 are in strong linear contact. Therefore, oil leakage from the crank chamber 4 can be reliably prevented. Furthermore, since the protrusion 18 is integrally formed with the rubber valve seat packing 10, the flat metal contact portion 16 has an annular recess 38 as described in the conventional example (FIG. 3).
Therefore, when the valve is closed after opening, even if the abutment part 1 against the protrusion 18
Even if the position of 6 deviates from the seating position before opening the valve,
There is no partial gap between the contact part 16 and the projection part 18, and there is no possibility of oil leakage.
以上説明したように本考案の利点をまとめると
次の通りである。 As explained above, the advantages of the present invention can be summarized as follows.
(1) 従来（第３図）のような弁ガイド３９や精密
なガイド孔４１を有するボス部４０を設けてい
ないので、部品点数が削減できると共に弁体９
（第１図）もプレス加工で簡単に成形すること
ができ、製造コストを大幅に削減できる。(1) Since the valve guide 39 and the boss portion 40 having a precise guide hole 41 as in the conventional case (Fig. 3) are not provided, the number of parts can be reduced and the valve body 9
(Fig. 1) can also be easily formed by press working, and manufacturing costs can be significantly reduced.
(2) 突起部１８の張出幅ｌをパツキン内周端側へ
ゆくに従い大きくすると共に、内周側端縁２０
を角張らせているので、突起部１８と弁体９の
間に油が溜まらず、しかも突起部１８と弁体９
は線接触的に強く接触する。従つて油漏れの必
配がない。(2) The projecting width l of the protrusion 18 is increased toward the inner circumferential end of the packing, and the inner circumferential edge 20
Since it is angular, oil does not accumulate between the protrusion 18 and the valve body 9, and moreover, the protrusion 18 and the valve body 9
are in strong line contact. Therefore, there is no possibility of oil leakage.
(3) 突起部１８を弾性材製の弁座パツキン１０に
一体に形成しているので、金属製の弁体９が突
起部１８に押し付けられていても弁体９に環状
の凹部（へたり）ができる必配はなく、従つて
一旦開弁して再び着座したときに、たとえ突起
部１８に対する弁体９の位置が開弁前の位置と
ずれていても、突起部１８と弁体９は全周にわ
たつて完全に密着し、油漏れの必配がない。(3) Since the protrusion 18 is integrally formed with the valve seat packing 10 made of an elastic material, even if the metal valve body 9 is pressed against the protrusion 18, the valve body 9 will not have an annular recess. ), and therefore, when the valve is opened and then seated again, even if the position of the valve body 9 relative to the protrusion 18 is different from the position before the valve was opened, the protrusion 18 and the valve body 9 is completely adhered to the entire circumference, and there is no possibility of oil leakage.
なお弁座パツキン１０はゴム製に限定されるも
のではなく、合成樹脂等各種の弾性材を利用する
ことができる。 Note that the valve seat packing 10 is not limited to being made of rubber, and may be made of various elastic materials such as synthetic resin.
第１図は本考案による安全弁の縦断面図、第２
図は第１図のイ部分の拡大部分断面図、第３図は
従来例の縦断面図、第４図は別の従来例の断面部
分図である。１……クランクケース、３……側
蓋、７……弁シート、８……弁ホルダー、９……
弁体、１０……弁座パツキン、１８……突起部。
Figure 1 is a longitudinal sectional view of the safety valve according to the present invention, Figure 2
The figures are an enlarged partial cross-sectional view of part A in FIG. 1, FIG. 3 is a vertical cross-sectional view of a conventional example, and FIG. 4 is a partial cross-sectional view of another conventional example. 1... Crank case, 3... Side cover, 7... Valve seat, 8... Valve holder, 9...
Valve body, 10...Valve seat gasket, 18...Protrusion.
Claims (1)
ース部分に固着し、弁シートに弾性材製の環状弁
座パツキンを接着し、弁ばねにより弁座パツキン
に着座される金属製弁体を弁ホルダー内に配置
し、弁座パツキンの弁体側の内周端部分に弁体側
へ突出する突起部を形成し、突起部の弁体側への
張出幅をパツキン外周端側から内周端側へゆくに
従い大きくなるようにすると共に、突起部の弁体
側のパツキン内周側端縁を角張らせていることを
特徴とするクランクケース爆発防止安全弁。 The valve seat with the valve holder fixed to it is fixed to the crankcase part, the annular valve seat packing made of elastic material is glued to the valve seat, and the metal valve body, which is seated on the valve seat packing by the valve spring, is placed inside the valve holder. A protrusion that protrudes toward the valve body is formed on the inner circumference of the valve seat packing on the valve body side, and the protrusion width of the protrusion toward the valve body increases from the outer circumference of the seal to the inner circumference. The crankcase explosion prevention safety valve is characterized in that the inner circumferential edge of the seal on the valve body side of the protrusion is angular.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15200981U JPS5856128U (en) | 1981-10-12 | 1981-10-12 | Crankcase explosion prevention safety valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15200981U JPS5856128U (en) | 1981-10-12 | 1981-10-12 | Crankcase explosion prevention safety valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5856128U JPS5856128U (en) | 1983-04-16 |
| JPS6141471Y2 true JPS6141471Y2 (en) | 1986-11-26 |
Family
ID=29944676
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15200981U Granted JPS5856128U (en) | 1981-10-12 | 1981-10-12 | Crankcase explosion prevention safety valve |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5856128U (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2615910A1 (en) * | 2005-08-01 | 2007-02-08 | Savvas Savvakis | Internal combustion engine |
-
1981
- 1981-10-12 JP JP15200981U patent/JPS5856128U/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5856128U (en) | 1983-04-16 |
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