JPH0417788A - Sealed type compressor - Google Patents
Sealed type compressorInfo
- Publication number
- JPH0417788A JPH0417788A JP11625290A JP11625290A JPH0417788A JP H0417788 A JPH0417788 A JP H0417788A JP 11625290 A JP11625290 A JP 11625290A JP 11625290 A JP11625290 A JP 11625290A JP H0417788 A JPH0417788 A JP H0417788A
- Authority
- JP
- Japan
- Prior art keywords
- oil
- moisture
- refrigerant
- moisture sensor
- refrigeration
- 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.)
- Pending
Links
- 239000003921 oil Substances 0.000 claims description 27
- 238000005057 refrigeration Methods 0.000 claims description 24
- 239000003507 refrigerant Substances 0.000 claims description 18
- 239000010721 machine oil Substances 0.000 claims description 16
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 8
- 150000001722 carbon compounds Chemical group 0.000 claims description 4
- 239000010696 ester oil Substances 0.000 claims description 4
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 claims description 4
- 229910052739 hydrogen Inorganic materials 0.000 claims description 3
- 239000001257 hydrogen Substances 0.000 claims description 3
- LVGUZGTVOIAKKC-UHFFFAOYSA-N 1,1,1,2-tetrafluoroethane Chemical group FCC(F)(F)F LVGUZGTVOIAKKC-UHFFFAOYSA-N 0.000 claims description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 2
- 238000005984 hydrogenation reaction Methods 0.000 claims description 2
- 239000007788 liquid Substances 0.000 abstract description 8
- 238000001816 cooling Methods 0.000 abstract description 5
- 239000004065 semiconductor Substances 0.000 abstract description 3
- 238000005299 abrasion Methods 0.000 abstract 2
- 230000003628 erosive effect Effects 0.000 abstract 2
- 239000002253 acid Substances 0.000 description 10
- 239000000126 substance Substances 0.000 description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 150000007513 acids Chemical class 0.000 description 6
- 230000006835 compression Effects 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
- 239000002274 desiccant Substances 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- PXBRQCKWGAHEHS-UHFFFAOYSA-N dichlorodifluoromethane Chemical compound FC(F)(Cl)Cl PXBRQCKWGAHEHS-UHFFFAOYSA-N 0.000 description 2
- 235000019404 dichlorodifluoromethane Nutrition 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010292 electrical insulation Methods 0.000 description 2
- 150000002148 esters Chemical class 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 230000000717 retained effect Effects 0.000 description 2
- 239000004338 Dichlorodifluoromethane Substances 0.000 description 1
- 229910000976 Electrical steel Inorganic materials 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- WCCJDBZJUYKDBF-UHFFFAOYSA-N copper silicon Chemical compound [Si].[Cu] WCCJDBZJUYKDBF-UHFFFAOYSA-N 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
Landscapes
- Compressor (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、冷蔵庫、冷凍庫等に用いる密閉型圧縮機に関
するものである。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a hermetic compressor used in refrigerators, freezers, etc.
従来の技術
近年、クロロフルオロカーボン（以下ＣＦＣと称する）
の影響によるオゾン層破壊及び地球の温暖化等の環境問
題が注目されている。このような観点より、冷媒である
ＣＦＣの使用量削減が、極めて重要なテーマとなってき
ている。従来、ＣＦＣとして使用されて来た完全ハロゲ
ン化炭素化合物は、少なくとも水素を１個以上含むハロ
ゲン化炭素化合物に代替化が図られつつある。Prior art In recent years, chlorofluorocarbons (hereinafter referred to as CFCs)
Environmental problems such as ozone layer depletion and global warming due to the effects of environmental pollution are attracting attention. From this perspective, reducing the amount of CFC refrigerant used has become an extremely important theme. The fully halogenated carbon compounds conventionally used as CFCs are being replaced by halogenated carbon compounds containing at least one hydrogen.
さらに具体的には、代表的な冷媒であるジクロロジフル
オロメタン（以下ＣＦＣ−１２と称する）は、ＣＦＣの
代替物質であり、オゾン破壊に対する影響の少ない１，
１，１．２−テトラフルオロエタン（以下ＲＦＣ−１３
４＆と称する）へ代替化を図るため種々の改善取組みが
なされている。More specifically, dichlorodifluoromethane (hereinafter referred to as CFC-12), a typical refrigerant, is an alternative substance to CFC and has a low impact on ozone depletion.
1,1,2-tetrafluoroethane (hereinafter referred to as RFC-13
Various improvement efforts are being made to replace the 4&.
例えば、１９７８年１０月発行のＤｕＰｏｎｔ社の Ｒ
ｅ５ｅａｒｃｈ Ｊ）ｉｓｃｌｏｓｕｒｅの記載によ
れば、ＲＦＣ−１３４＆は従来のどのような油とも相溶
性が悪く全ての温度域で二層分離を生じ、唯一グリコー
ル系油にのみ溶解する。For example, DuPont's R
According to the description in e5earch J)isclosure, RFC-134& has poor compatibility with any conventional oil, causes two-layer separation in all temperature ranges, and is soluble only in glycol-based oils.
しかし、その後の研究によりエステル系油にも溶解する
ことが判ってきた０例えば、米国特許第４８５１１４４
号においてエステル系とグリコール系の混合した冷凍機
油が冷媒ＨＦＣ−１３４ａに溶解することが示されてい
る。However, subsequent research has revealed that it is also soluble in ester oils.For example, US Pat. No. 4,851,144
It is shown in No. 1 that refrigerating machine oil, which is a mixture of ester and glycol oils, dissolves in the refrigerant HFC-134a.
第２図は、従来の密閉型圧縮機の断面図である。FIG. 2 is a sectional view of a conventional hermetic compressor.
第２図において１は機械部であり、シャフト２、副軸受
８、軸受４、ピストン５、シリンダー６からなる。前記
、シャフト２、副軸受３、軸受４、ピストン５、シリン
ダー６は圧縮室７を形成している。８は給油装置であり
、給油管９と前記給油管内に位置し粘性ポンプとして働
くバネ１０とから成り立っている。１１は冷媒ＣＦＣ−
１２と冷凍機油の混合液であり給油装置８は混合液１１
を摺動面に供給する。１２はモーター部である。１３は
、モーター部１２に電気を供給するためのターミナル部
である。また１４は前記の機械部１やモーター部１２を
収納する金属性の密閉ケーシングである。In FIG. 2, reference numeral 1 denotes a mechanical section, which consists of a shaft 2, a sub-bearing 8, a bearing 4, a piston 5, and a cylinder 6. The shaft 2, sub-bearing 3, bearing 4, piston 5, and cylinder 6 form a compression chamber 7. Reference numeral 8 denotes an oil supply device, which is composed of an oil supply pipe 9 and a spring 10 located inside the oil supply pipe and functioning as a viscous pump. 11 is refrigerant CFC-
12 and refrigerating machine oil, and the oil supply device 8 is a mixed liquid of 11 and refrigeration oil.
is supplied to the sliding surface. 12 is a motor section. 13 is a terminal section for supplying electricity to the motor section 12. Further, 14 is a metal sealed casing that houses the mechanical section 1 and the motor section 12.
発明が解決しようとする課題
以上のように構成されたー閉型圧縮機において、シャフ
ト２は、モーター部１２０回転力によって回転し、ピス
トン５を動が、し、副軸受３、軸受４、及びシリンダー
６によって形成された圧縮室７内の冷媒を圧縮する。圧
縮された冷媒は凝縮器で液化し、ドライヤ内にある乾燥
剤で脱水された後、蒸発器で気化し冷却を行なフた後再
び圧縮機に戻ってくる。Problems to be Solved by the Invention In the closed compressor configured as described above, the shaft 2 rotates by the rotational force of the motor section 120, moves the piston 5, and rotates the auxiliary bearing 3, the bearing 4, and The refrigerant in the compression chamber 7 formed by the cylinder 6 is compressed. The compressed refrigerant is liquefied in the condenser, dehydrated by a desiccant in the dryer, vaporized in the evaporator, cooled, and then returned to the compressor.
また、図に示したような圧縮機は、近年省スペース化を
目的として小型化される傾向に有るため放熱が悪くなり
高温で使われることが多くなっている。このため、一般
的に耐熱性がよいエステル系油やグリコール系油でも、
空気や水分等の不純物が共存し高温になると化学反応を
起こし冷凍システムにとって有害な物質を生成する。特
にエステル系油は冷凍機油中に残った微量の水分によっ
て加水分解を起こして酸を生じ、その反応で生じた酸が
触媒作用を持ち、さらに多量の酸や有害物質を生じさせ
る。In addition, compressors such as the one shown in the figure have recently become smaller in size for the purpose of space saving, so they have poor heat dissipation and are often used at high temperatures. For this reason, even ester oils and glycol oils, which generally have good heat resistance,
When impurities such as air and moisture coexist and the temperature reaches high temperatures, chemical reactions occur and produce substances that are harmful to the refrigeration system. In particular, ester oils are hydrolyzed by trace amounts of water left in the refrigerating machine oil to produce acids, and the acids produced by this reaction have a catalytic effect, producing even larger amounts of acids and harmful substances.
そして発生した酸や有害物質は冷凍機油の電気絶縁性を
悪化さる。特に酸は機械部１の摺動面に給油され腐蝕摩
耗を生じ圧縮機の寿命を短くする。The generated acids and harmful substances deteriorate the electrical insulation properties of the refrigerating machine oil. In particular, acid is supplied to the sliding surfaces of the mechanical part 1, causing corrosive wear and shortening the life of the compressor.
また、発生した有害物質の内の重合物は冷凍システムの
配管内に詰まり冷却不良を生じる。In addition, polymers among the generated harmful substances clog the pipes of the refrigeration system, resulting in poor cooling.
もちろん、冷凍機油を事前に浄油機などを使用して脱水
したり冷凍システムの乾燥剤の量を増加させたすして対
応できないことはない、しかし、浄油機による脱水は限
度が有る上、冷凍システム配管の表面に吸着した水分や
モーター部１２のステーターの珪素銅板の密着した隙間
に保持されている水分は除去できない、そして、これら
の除去できない水分は密閉型圧縮機を使用していると徐
々に析出する。そのためどうしても冷凍機油中には微量
の水分が残存する。また、冷凍システムの乾燥剤の量を
増加させても冷凍機油が親水性であることから完全に水
分を除去できなかった。Of course, it is not impossible to deal with this by dehydrating the refrigeration oil in advance using an oil purifier or by increasing the amount of desiccant in the refrigeration system. However, dehydration using an oil purifier has its limits. Moisture adsorbed on the surface of the refrigeration system piping and moisture retained in the tight gaps between the silicon copper plates of the stator of the motor section 12 cannot be removed. Precipitates gradually. Therefore, a trace amount of water inevitably remains in the refrigerating machine oil. Furthermore, even if the amount of desiccant in the refrigeration system was increased, water could not be completely removed because refrigeration oil is hydrophilic.
従って、本発明の密閉型圧縮機は少なくとも１個以上の
水素で置換されたハロゲン化炭素化合物からなる冷媒と
前記冷媒に溶解しる冷凍機油を封入し、分解を起こし酸
を発生して冷凍システムが故障になる前に不良の検知で
きる密閉型圧縮機を提供することが課題である。Therefore, the hermetic compressor of the present invention encloses a refrigerant made of a halogenated carbon compound substituted with at least one hydrogen and refrigeration oil dissolved in the refrigerant, which decomposes and generates acid to create a refrigeration system. The challenge is to provide a hermetic compressor that can detect defects before they break down.
課題を解決するための手段
上記課題を解決するために本発明の圧縮機は、冷媒と冷
凍機油を封入した密閉ケーシングと、前記密閉ケーシン
グ内に収納された機械部と前記機械部を駆動させるモー
ター部と、前記機械部に冷凍機油を搬送する給油装置と
、前記冷凍機油に浸漬された位置に設置された水分セン
サーとから成るものである。Means for Solving the Problems In order to solve the above problems, a compressor of the present invention includes a sealed casing in which refrigerant and refrigeration oil are sealed, a mechanical part housed in the sealed casing, and a motor for driving the mechanical part. , an oil supply device for conveying refrigerating machine oil to the mechanical part, and a moisture sensor installed at a position immersed in the refrigerating machine oil.
作用
本発明は上記した構成によって、徐々に析出してくる水
分が冷凍機油に溶解し規定量以上になることを検知して
水分除去の対策を図るものである。Function The present invention uses the above-described configuration to detect when the gradually precipitated water is dissolved in the refrigerating machine oil and exceeds a specified amount, and takes measures to remove the water.
実施例
以下、本発明の一実施例の圧縮機について、図１図を参
照しながら説明するが、従来例と同じものは、同一番号
を付して説明を省略する。EXAMPLE Hereinafter, a compressor according to an example of the present invention will be described with reference to FIG. 1. Parts that are the same as those of the conventional example will be given the same numbers and the description thereof will be omitted.
１５は密閉ケーシングの下方の給油装置８に隣接する位
置に設けられた突起部である。１６は突起部１５の底部
に設けられたベプロスカイト型の半導体を用いた水分セ
ンサーである。１７は水分センサー１６からの信号を取
り出すためのセンサーターミナル部である。また、１８
は傾斜付き密閉ケーシングである。Reference numeral 15 denotes a protrusion provided at a position adjacent to the oil supply device 8 below the sealed casing. A moisture sensor 16 is provided at the bottom of the protrusion 15 and uses a beproskite semiconductor. 17 is a sensor terminal section for taking out a signal from the moisture sensor 16. Also, 18
is a sloped closed casing.
以上のように構成された密閉型圧縮機についてその動作
を説明する。The operation of the hermetic compressor configured as above will be explained.
シャフト２は、モーター部１２の回転力によって回転し
、ピストン５を動かし、副軸受３、軸受４、及びシリン
ダー６によって形成された圧縮室７内の冷媒を圧縮する
。この時の圧縮熱とモーター部１２の発熱により密閉型
圧縮機の温度が上昇する。一方、圧縮された冷媒は冷凍
システムで冷却を行ない再び圧縮機に戻ってくる。この
時、冷媒ＲＦＣ−１３４＆と冷凍機油の混合液が潤滑の
ため給油装置８を通じて機械部に供給される。The shaft 2 is rotated by the rotational force of the motor section 12, moves the piston 5, and compresses the refrigerant in the compression chamber 7 formed by the sub-bearing 3, the bearing 4, and the cylinder 6. At this time, the temperature of the hermetic compressor increases due to the heat of compression and the heat generated by the motor section 12. Meanwhile, the compressed refrigerant is cooled in the refrigeration system and returned to the compressor. At this time, a liquid mixture of refrigerant RFC-134& and refrigerating machine oil is supplied to the mechanical part through the oil supply device 8 for lubrication.
このようにして、密閉型圧縮機を使用している内に冷凍
システム配管の表面に吸着した水分やモーター部１２の
ステーターの珪素鋼板の密着した隙間に保持されていた
水分が発熱などにより徐々に析出してくる。この析８し
てきた水分は、一部は冷媒に溶解し冷凍システムを循環
してドライヤ内にある乾燥剤で脱水される。しかし、大
部分は冷凍機油に溶は込み、特にエステル系冷凍機油で
は加水分解し酸や有害物質を生じる。In this way, while using a hermetic compressor, the moisture that has been adsorbed on the surface of the refrigeration system piping and the moisture that has been retained in the tight gaps between the silicon steel plates of the stator of the motor section 12 is gradually removed due to heat generation, etc. It will precipitate out. A portion of this analyzed moisture is dissolved in a refrigerant, circulated through the refrigeration system, and dehydrated using a desiccant in the dryer. However, most of it dissolves in refrigerating machine oil, and especially in ester-based refrigerating machine oil, it hydrolyzes, producing acids and harmful substances.
本発明は、冷凍機油に水分が溶解しその水分が水分セン
サー１６の表面に化学吸着し酸化物に対して電子供与体
として働き半導体の電気抵抗を変化させる事を利用する
ものである。すなわち、水分センサー１６の電気抵抗が
、ある規定値以上になると、例えばブザー等（図示しな
い）を使用して警報を鳴らすようにする。これにより、
サービスマン等が適宜冷凍システム中の析出した水分を
真空引き等で除去できる。冷凍システム内で発生した酸
や有害物質により次のような不良が生じて修復できない
ようになる前に対応が可能となる。The present invention utilizes the fact that water is dissolved in refrigerating machine oil, and the water is chemically adsorbed on the surface of the moisture sensor 16, acts as an electron donor to oxides, and changes the electrical resistance of the semiconductor. That is, when the electrical resistance of the moisture sensor 16 exceeds a certain specified value, an alarm is sounded using, for example, a buzzer or the like (not shown). This results in
A service person or the like can remove the precipitated moisture in the refrigeration system by vacuuming or the like as appropriate. This makes it possible to take action before the following defects occur due to acids and harmful substances generated within the refrigeration system and become irreparable.
なお不良としては冷凍機油の電気絶縁性が悪化し漏電が
発生し感電すること。特に酸は機械部１の摺動面に給油
され腐蝕摩耗を生じ圧縮機が漬れること。また、発生し
た有害物質の内の重合物は冷凍システムの配管内に詰ま
り冷却不良を生じ、−度詰まりが生じると修復できない
ことである。In addition, a defect may be that the electrical insulation of the refrigerating machine oil deteriorates, causing an electrical leak and causing an electric shock. In particular, acid is supplied to the sliding surfaces of the mechanical part 1, causing corrosive wear and soaking of the compressor. Furthermore, polymers among the generated harmful substances clog the piping of the refrigeration system, causing poor cooling, and once the piping is clogged, it cannot be repaired.
また、密閉型圧縮機の中の冷媒と冷凍機油の混合比は冷
凍システムの状態によって変わるため混合液１１の液面
は常に一定ではない。本発明では、特に水分センサーを
突起部１５の底部に設け、さらに傾斜付き密閉ケーシン
グ１８と言う構造を有している。そのため混合液１１の
液面が変動しても、水分センサー１６は液面下に保持さ
れ正確な水分量の信号が取り出せる。Further, since the mixing ratio of the refrigerant and refrigeration oil in the hermetic compressor changes depending on the state of the refrigeration system, the liquid level of the mixed liquid 11 is not always constant. In the present invention, in particular, a moisture sensor is provided at the bottom of the protrusion 15, and the casing 18 has a sloped closed casing 18. Therefore, even if the liquid level of the mixed liquid 11 fluctuates, the moisture sensor 16 is held below the liquid level and an accurate signal of the moisture content can be obtained.
なお、ブザー等により警報を発する変わりに、密閉型圧
縮機を停止させてもよい。Note that instead of issuing a warning using a buzzer or the like, the hermetic compressor may be stopped.
発明の効果
以上のように本発明の圧縮機は、冷媒と冷凍機油を封入
した密閉ケーシングと、前記密閉ケーシング内に収納さ
れた機械部と前記機械部を駆動させるモーター部と、前
記機械部に冷凍機油を搬送する給油装置と、前記冷凍機
油に浸漬された位置に設置された水分センサーとから成
ることを特徴とするものであり、多量の酸や有害物質を
生じる前に水分量を検知し漏電や腐蝕摩耗や、冷却不良
が起こるのを未然に防ぐことができる。Effects of the Invention As described above, the compressor of the present invention includes a sealed casing in which refrigerant and refrigeration oil are sealed, a mechanical part housed in the sealed casing, a motor part that drives the mechanical part, and a motor part that drives the mechanical part. This device is characterized by consisting of an oil supply device that conveys refrigerating machine oil, and a moisture sensor installed at a position immersed in the refrigerating machine oil, and detects the amount of moisture before producing a large amount of acid or harmful substances. It can prevent electrical leakage, corrosive wear, and poor cooling.
第１図は本発明の一実施例における圧縮機の断面図、第
２図は従来の圧縮機の断面図である。
１・・・機械部、８・・・給油装置、１２・・モーター
部、１６・・・水分センサー １７・・センサーターミ
ナル部。FIG. 1 is a sectional view of a compressor according to an embodiment of the present invention, and FIG. 2 is a sectional view of a conventional compressor. 1... Mechanical part, 8... Oil supply device, 12... Motor part, 16... Moisture sensor 17... Sensor terminal part.
Claims (2)
化炭素化合物からなる冷媒と前記冷媒に溶解する冷凍機
油を封入した密閉ケーシングと、前記密閉ケーシング内
に収納された機械部と前記機械部を駆動させるモーター
部と、前記機械部に冷凍機油を搬送する給油装置と、前
記冷凍機油に浸漬された位置に設置された水分センサー
とから成ることを特徴とする冷凍システム用の密閉型圧
縮機。(1) A sealed casing containing a refrigerant made of a halogenated carbon compound substituted with at least one hydrogen and refrigeration oil dissolved in the refrigerant, a mechanical part housed in the sealed casing, and a mechanical part. A hermetic compressor for a refrigeration system, comprising: a driving motor section; an oil supply device that conveys refrigeration oil to the mechanical section; and a moisture sensor installed at a position immersed in the refrigeration oil.
あり、冷凍機油がエステル系油とグリコール系油である
ことを特徴とする請求項（１）記載の密閉型圧縮機。(2) The hermetic compressor according to claim (1), wherein the refrigerant is 1,1,1,2-tetrafluoroethane, and the refrigerating machine oil is an ester oil and a glycol oil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11625290A JPH0417788A (en) | 1990-05-02 | 1990-05-02 | Sealed type compressor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11625290A JPH0417788A (en) | 1990-05-02 | 1990-05-02 | Sealed type compressor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0417788A true JPH0417788A (en) | 1992-01-22 |
Family
ID=14682530
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11625290A Pending JPH0417788A (en) | 1990-05-02 | 1990-05-02 | Sealed type compressor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0417788A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0915009A1 (en) | 1997-11-06 | 1999-05-12 | Yamaha Hatsudoki Kabushiki Kaisha | Speed change gear system for bicycle |
-
1990
- 1990-05-02 JP JP11625290A patent/JPH0417788A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0915009A1 (en) | 1997-11-06 | 1999-05-12 | Yamaha Hatsudoki Kabushiki Kaisha | Speed change gear system for bicycle |
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