JP2772026B2 - Universal joint - Google Patents
Universal jointInfo
- Publication number
- JP2772026B2 JP2772026B2 JP1084236A JP8423689A JP2772026B2 JP 2772026 B2 JP2772026 B2 JP 2772026B2 JP 1084236 A JP1084236 A JP 1084236A JP 8423689 A JP8423689 A JP 8423689A JP 2772026 B2 JP2772026 B2 JP 2772026B2
- Authority
- JP
- Japan
- Prior art keywords
- convex portion
- intermediate ring
- input shaft
- concave groove
- groove
- 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 - Lifetime
Links
Landscapes
- Mechanical Operated Clutches (AREA)
- One-Way And Automatic Clutches, And Combinations Of Different Clutches (AREA)
Description
【発明の詳細な説明】 ＜産業上の利用分野＞ 本発明は入力軸と出力軸の間に中間リングを介して回
転力を伝達する自在継手に関する。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a universal joint that transmits a rotational force between an input shaft and an output shaft via an intermediate ring.
＜従来の技術＞ 一般に軸同士を接続するには継手が用いられている。
この継手は主に一定回転下で用いられ、トルクを正確に
伝達することを目的としたものと、サーボモータとエン
コーダや送りネジとを接続し、トルク伝達よりも回転角
を正確に伝えることを目的としたものとがある。前者に
は十字径の中間ピンを２つの回転軸に形成されたコ字形
のフック部に回転可能に結合したフック継手等があり、
回転を伝えることを目的とするため、負荷容量や耐久性
のみに注意すればよいが、後者は回転、停止を繰り返す
場合が多く、バックラッシュや捩じり剛性が問題とな
る。また、軸同士の偏心や偏角を吸収することが継手の
重要な役割となってくる。このため従来より、板バネや
コイルバネを介して軸同士を接続したものや２本の回転
軸の間に中間部材を配置し、この中間部材と回転軸の一
方に直交する凸部を形成し、他方にこの凸部に遊嵌する
凹溝を形成したオルダム式軸継手があった。<Prior Art> Generally, joints are used to connect shafts.
This joint is mainly used under constant rotation and aims to transmit the torque accurately, and connects the servo motor to the encoder or feed screw to transmit the rotation angle more accurately than torque transmission. Some are aimed. The former includes a hook joint and the like in which a cross-shaped intermediate pin is rotatably connected to a U-shaped hook portion formed on two rotation shafts,
Since the purpose is to transmit the rotation, attention should be paid only to the load capacity and the durability. However, the latter often repeats rotation and stop, and causes backlash and torsional rigidity. In addition, absorbing the eccentricity and declination of the shafts plays an important role of the joint. For this reason, conventionally, an intermediate member is disposed between two shafts or a shaft in which the shafts are connected via a leaf spring or a coil spring, and a convex portion that is orthogonal to one of the intermediate member and the rotation shaft is formed. On the other hand, there is an Oldham type shaft coupling in which a concave groove for loosely fitting into the convex portion is formed.
＜考案が解決しようとする課題＞ しかし、上述の何れのものも偏心や偏角を充分吸収で
きバックラッシュがなく捩じり剛性が大きい等の要求を
全て充分に満足するものがなかった。<Problems to be Solved by the Invention> However, none of the above-mentioned ones can sufficiently absorb eccentricity and declination, has no backlash, and has high torsional rigidity.
＜課題を解決するための手段＞ 本発明は上述した要求をすべて満足するためになされ
たもので、入力軸と出力軸の間に中間リングを配置し、
この中間リングと入力軸の一方に径方向に伸びる第１凸
部を形成し、他方にこの第１凸部と隙間をもって嵌合す
る第１凹溝を形成し、前記出力軸と中間リングの一方に
前記第１凸部と直交する方向に伸びる第２凸部を形成
し、他方にこの第２凸部と隙間をもって嵌合する第２凹
溝を形成し、この第１凹溝を形成した前記入力軸もしく
は中間リングと第１凸部とを径方向にのみ相対移動可能
に湾曲可能な弾性線材で前記第１凹溝と前記第１凸部が
非接触状態を維持するように前記第１凸部の円周方向両
側でそれぞれ結合し、前記第２凹溝を形成した前記出力
軸もしくは中間リングと第２凸部とを径方向にのみ相対
移動可能に湾曲可能な弾性線材で前記第２凹溝と前記第
２凸部が非接触状態を維持するように前記第２凸部の円
周方向両側でそれぞれ結合したものである。また、前記
第1,第２凹溝と前記第1,第２凸部が非接触状態を維持す
るように前記弾性線材で前記第２凹溝と前記第２凸部が
非接触状態を維持するように前記第の軸方向端面を90゜
ひねった板バネで結合したものである。<Means for Solving the Problems> The present invention has been made to satisfy all the above-mentioned requirements, and has an intermediate ring disposed between an input shaft and an output shaft.
One of the intermediate ring and the input shaft is formed with a first convex portion extending in the radial direction, and the other is formed with a first concave groove which fits with the first convex portion with a gap, and one of the output shaft and the intermediate ring is formed. Forming a second convex portion extending in a direction orthogonal to the first convex portion, forming a second concave groove fitted with a gap with the second convex portion on the other side, and forming the first concave groove. The input shaft or the intermediate ring and the first convex portion are elastic wires capable of being relatively moved only in the radial direction so that the first concave groove and the first convex portion are maintained in a non-contact state. The output shaft or intermediate ring having the second groove formed therein and the second convex portion are coupled to each other on both circumferential sides of the portion, and the second concave portion is formed of an elastic wire rod that can be bent so as to be relatively movable only in the radial direction. The groove and the second convex portion are respectively provided on both circumferential sides of the second convex portion so as to maintain a non-contact state. In which bound. Also, the elastic wire keeps the second concave groove and the second convex portion in a non-contact state such that the first and second concave groove and the first and the second convex portion maintain the non-contact state. Thus, the second axial end faces are connected by a leaf spring twisted by 90 degrees.
＜作用＞ 弾性線部材で結合したものは、入力軸から中間リング
に時計回りに回転力が伝達されるとき、第１凸部の一方
の側面の弾性線材では引張力が作用し、他方の側面の弾
性線材では圧縮力が作用する。これにより、引張力が作
用する側の一方の側面においては弾性線材に剛性がある
ことから、第１凹溝と第１凸部の間を常に非接触状態に
保って回転力を入力軸から中間軸に伝えることになる。<Effect> When the rotational force is transmitted clockwise from the input shaft to the intermediate ring, the elastic wire member on one side of the first convex portion acts on the elastic wire member, and the tensile force acts on the other side surface. A compressive force acts on the elastic wire. As a result, since the elastic wire has rigidity on one side on which the tensile force acts, the rotational force is intermediately moved from the input shaft while always maintaining the non-contact state between the first concave groove and the first convex portion. I will tell the axis.
また、逆に入力軸から中間リングに反時計回りに回転
力が伝達されるとき、第１凸部の他方の側面の弾性線材
では引張力が作用し、一方の側面の弾性線材では圧縮力
が作用する。これにより、引張力が作用する側の他方の
側面においては弾性線材に剛性があることから、第１凹
溝と第１凸部の間を常に非接触状態に保って回転力を入
力軸から中間軸に伝えることになる。Conversely, when a rotational force is transmitted counterclockwise from the input shaft to the intermediate ring, a tensile force acts on the elastic wire on the other side of the first convex portion, and a compressive force acts on the elastic wire on one side. Works. Thereby, since the elastic wire has rigidity on the other side surface on which the tensile force acts, the rotational force is kept in a non-contact state between the first concave groove and the first convex portion at all times, so that the rotational force is intermediate from the input shaft. I will tell the axis.
同様に中間リングから出力軸に時計回りに回転力が伝
達されるときも第２凸部の一方の側面の弾性線材では引
張力が作用し、他方の側面の弾性線材では圧縮力が作用
する。これにより、引張力が作用する側の一方の側面に
おいては弾性線材に剛性があることから、第２凹溝と第
２凸部の間を常に非接触状態に保って回転力を入力軸か
ら中間リングに伝えることになる。Similarly, when a rotational force is transmitted clockwise from the intermediate ring to the output shaft, a tensile force acts on the elastic wire on one side of the second convex portion, and a compressive force acts on the elastic wire on the other side. Thereby, since the elastic wire has rigidity on one side on which the tensile force acts, the rotational force is kept in a non-contact state between the second concave groove and the second convex portion, and the rotational force is intermediate from the input shaft. I will tell the ring.
また、逆に入力軸から中間リングに反時計回りに回転
力が伝達されるとき、第２凸部の他方の側面の弾性線材
では引張力が作用し、一方の側面の弾性線材では圧縮力
が作用する。これにより、引張力が作用する側の他方の
側面においては弾性線材に剛性があることから、第２凹
溝と第２凸部の間を常に非接触状態に保って回転力を中
間リングから出力軸に伝えることになる。Conversely, when a rotational force is transmitted counterclockwise from the input shaft to the intermediate ring, a tensile force acts on the elastic wire on the other side of the second protrusion, and a compressive force acts on the elastic wire on one side. Works. Since the elastic wire has rigidity on the other side on which the tensile force acts, the rotational force is output from the intermediate ring while always maintaining the non-contact state between the second concave groove and the second convex portion. I will tell the axis.
以上のように入力軸が時計回りに回る場合も逆に反時
計回りに回る場合も第１凸部及び第２凸部の両側のいず
れか一方の弾性線材に引張力が作用して第１凹溝及び第
２凹溝との間で常に非接触状態を保つことでバックラッ
シュを発生することなく、確実に回転力を伝え、入力軸
と出力軸の軸線方向と径方向には線部材が湾曲すること
により、軸の偏心や偏角の吸収が可能である。また90゜
ひねった板バネの場合も同様に入力軸および出力軸の回
転方向には確実に回転力を伝え、軸線方向と径方向には
弾性力があるため撓むことにより、軸の偏心や偏角を十
分に吸収できる。As described above, regardless of whether the input shaft rotates clockwise or counterclockwise, the tensile force acts on one of the elastic wires on both sides of the first convex portion and the second convex portion to cause the first concave portion. By maintaining a non-contact state between the groove and the second groove at all times, the rotational force is transmitted without any backlash, and the wire member is curved in the axial direction and the radial direction of the input shaft and the output shaft. By doing so, it is possible to absorb eccentricity and declination of the shaft. Similarly, in the case of a 90 ° twisted leaf spring, the rotation force of the input shaft and the output shaft is reliably transmitted in the rotation direction. The declination can be sufficiently absorbed.
＜実施例＞ 以下本発明の実施例を図面に基づいて説明する。第１
図において、10は入力軸であり、11は出力軸である。こ
れら入力軸10と出力軸11には、入力ハブ13と出力ハブ14
がそれぞれ連結されている。これら入力ハブと出力ハブ
の間には中間リング15が配置されている。前記入力ハブ
13の端面には扇状の段部16が図面において縦方向に１組
形成され、横方向には切欠き部17が形成される。この段
部16には第１凹溝18が形成されており、この第１凹溝18
には中間リング15の円周縦方向（径方向）に形成された
第１凸部19が軸方向および径方向に隙間をもって嵌合し
ている。段部16の円周方向には貫通穴９が形成されてお
り、この貫通穴９には第１凸部19と両側に位置する段部
16とを第２図に示すようにワイヤ20が通されている。こ
のワイヤ20は貫通穴９の両端および第１凸部19に溶着さ
れている。これにより中間リング15は径方向および軸方
向に揺動可能にされている。この中間リング15の円周に
は前記第１凸部19と直交する方向に伸びる第２凸部21が
形成されている。前記出力ハブ14には入力ハブとは逆に
横方向には扇状の段部22が、縦方向には切欠き部23がそ
れぞれ形成され、段部22には前記第２凸部21に隙間をも
って嵌合する第２凹溝24が形成されている。段部22の円
周方向には前記段部16と同様に貫通穴９が形成されてお
り、この貫通穴９には第２凸部21と両側に位置する段部
22とを第２図に示すようにワイヤ20が通されている。こ
のワイヤ20は貫通穴９の両端および第２凸部22に溶着さ
れている。また前記段部16と切欠き部23が隙間をもって
嵌合し、同様に段部22と切欠き部17が隙間をもって嵌合
している。<Example> Hereinafter, an example of the present invention will be described with reference to the drawings. First
In the figure, 10 is an input shaft and 11 is an output shaft. These input shaft 10 and output shaft 11 have input hub 13 and output hub 14
Are connected to each other. An intermediate ring 15 is disposed between the input hub and the output hub. The input hub
A set of fan-shaped steps 16 is formed on the end face of the fan 13 in the vertical direction in the drawing, and a notch 17 is formed in the horizontal direction. The step 16 has a first groove 18 formed therein.
The first convex portion 19 formed in the circumferential vertical direction (radial direction) of the intermediate ring 15 is fitted with a gap in the axial direction and the radial direction. A through hole 9 is formed in the circumferential direction of the step portion 16, and the through hole 9 has the first convex portion 19 and step portions located on both sides.
As shown in FIG. The wire 20 is welded to both ends of the through hole 9 and the first projection 19. This allows the intermediate ring 15 to swing in the radial and axial directions. On the circumference of the intermediate ring 15, a second convex portion 21 extending in a direction orthogonal to the first convex portion 19 is formed. Conversely to the input hub, the output hub 14 is formed with a fan-shaped step portion 22 in the horizontal direction and a notch portion 23 in the vertical direction, and the step portion 22 has a gap in the second convex portion 21. A second concave groove 24 to be fitted is formed. A through hole 9 is formed in the circumferential direction of the step portion 22 in the same manner as the step portion 16. The through hole 9 has the second convex portion 21 and step portions located on both sides.
As shown in FIG. The wire 20 is welded to both ends of the through hole 9 and the second convex portion 22. The step 16 and the notch 23 are fitted with a gap, and similarly, the step 22 and the notch 17 are fitted with a gap.
以上のような構成で、動作について説明する。入力軸
10に時計回りの回転が加えられると、連結された入力ハ
ブ13に回転が伝達される。入力ハブ13が時計回りに回転
すると、第１凹溝18内の回転方向側にある側面において
ワイヤ20に引張力が作用する。この引張力の作用によっ
て第１凹溝18から第１凸部19にワイヤ20を介して時計回
りの回転力が伝達される。同様に第２凸部21の回転方向
とは逆側の側面においてワイヤ20に引張力が作用する。
この引張力の作用によって第２凸部21から第２凹溝24に
ワイヤ20を介して時計回りの回転力が伝達される。The operation of the above configuration will be described. Input shaft
When clockwise rotation is applied to 10, the rotation is transmitted to the connected input hub 13. When the input hub 13 rotates clockwise, a pulling force acts on the wire 20 on the side surface on the rotation direction side in the first groove 18. By the action of the tensile force, a clockwise rotational force is transmitted from the first groove 18 to the first convex portion 19 via the wire 20. Similarly, a tensile force acts on the wire 20 on the side surface opposite to the rotation direction of the second convex portion 21.
By the action of the tensile force, a clockwise rotational force is transmitted from the second convex portion 21 to the second concave groove 24 via the wire 20.
また、逆に入力軸10に反時計回りの回転が加えられる
と、上述した時計回りの回転を与えたときとは逆側にな
る第１凹溝18内の回転方向側にある側面においてワイヤ
20に引張力が作用する。この引張力の作用によって第１
凹溝18から第１凸部19にワイヤ20を介して時計回りの回
転力が伝達される。同様に第２凸部21の回転方向とは逆
側の側面においてワイヤ20に引張力が作用する。この引
張力の作用によって第２凸部21から第２凹溝24にワイヤ
20を介して反時計回りの回転力が伝達される。Conversely, when the counterclockwise rotation is applied to the input shaft 10, the wire is turned on the side surface on the rotation direction side in the first concave groove 18 which is on the opposite side to the above-described clockwise rotation.
Tensile force acts on 20. By the action of this tensile force, the first
A clockwise rotational force is transmitted from the concave groove 18 to the first convex portion 19 via the wire 20. Similarly, a tensile force acts on the wire 20 on the side surface opposite to the rotation direction of the second convex portion 21. By the action of this pulling force, the wire is moved from the second convex portion 21 to the second
A counterclockwise rotation force is transmitted via 20.
これにより、入力軸10からの回転力の伝達を回転方向
に関わらずに第1,第２凸部と第1,第２凹部の隙間を変化
させることなく、バックラッシュを発生させずに回転力
を伝達できる。また入力軸10と出力軸11に偏心や偏角が
生じている場合にはワイヤ20によって中間リングがフロ
ーチングされているため、第1,第２凸部19,21が第1,第
２凹部18,24内で揺動し、偏心や偏角を吸収することが
できる。なお、このワイヤ20は小径のピンに置き換える
ことも可能である。また、第３図に示すように90゜ひね
った板バネ30によって段部16の出力ハブ14と対向する端
面と第１凸部19の上面とを結合することによって、板バ
ネ30が軸線方向と径方向にのみ撓み、回転方向には撓ま
ないため、偏心および偏角を吸収し、回転は正確に伝達
できるようになる。As a result, the transmission of the rotational force from the input shaft 10 does not change the gap between the first and second convex portions and the first and second concave portions irrespective of the rotation direction, and does not cause backlash. Can be transmitted. When the input shaft 10 and the output shaft 11 are eccentric or deflected, the intermediate ring is floated by the wire 20, so that the first and second convex portions 19 and 21 are formed by the first and second concave portions. It swings between 18, 24, and can absorb eccentricity and declination. Note that the wire 20 can be replaced with a pin having a small diameter. As shown in FIG. 3, the end face of the step portion 16 facing the output hub 14 and the upper surface of the first convex portion 19 are joined by a 90 ° twisted leaf spring 30, so that the leaf spring 30 Since it bends only in the radial direction and does not bend in the rotational direction, eccentricity and declination are absorbed, and rotation can be transmitted accurately.
＜発明の効果＞ 以上述べたように本発明においては、第１凸部と第１
凹溝および第２凸部と第２凹溝の両端を弾性線材もしく
は90゜ひねった板バネで結合したので、スムーズに軸線
方向及び径方向の移動ができ、偏心や偏角を充分に吸収
できるとともに、時計回り・反時計回りの何れの回転に
もバックラッシュがなく捩じり剛性が大きい自在継手と
することができる利点がある。<Effect of the Invention> As described above, in the present invention, the first convex portion and the first
Both ends of the concave groove and the second convex portion and the second concave groove are connected by an elastic wire or a 90 ° twisted leaf spring, so that axial and radial movement can be performed smoothly and eccentricity and declination can be sufficiently absorbed. At the same time, there is an advantage that a universal joint having high torsional rigidity without backlash in both clockwise and counterclockwise rotations can be obtained.
図面は本発明の実施例を説明するためのもので、第１図
は自在継手の構造を説明するための分解斜視図、第２図
は第１実施例による自在継手の要部断面図、第３図は第
２実施例の要部拡大図である。 10……入力軸、11……出力軸、13……入力ハブ、14……
出力ハブ、15……中間リング、18……第１凹溝、19……
第１凸部、20……ワイヤ、21……第２凸部、22……第２
凹溝、30……板バネ。BRIEF DESCRIPTION OF THE DRAWINGS The drawings are for explaining the embodiment of the present invention, FIG. 1 is an exploded perspective view for explaining the structure of the universal joint, FIG. FIG. 3 is an enlarged view of a main part of the second embodiment. 10 ... input shaft, 11 ... output shaft, 13 ... input hub, 14 ...
Output hub, 15 Middle ring, 18 First groove, 19
1st convex part, 20 ... wire, 21 ... second convex part, 22 ... second
Groove, 30 ... leaf spring.
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.6，ＤＢ名) F16D 3/06 F16D 3/60 F16H 57/12──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. 6 , DB name) F16D 3/06 F16D 3/60 F16H 57/12
Claims (2)
し、この中間リングと入力軸の一方に径方向に伸びる第
１凸部を形成し、他方にこの第１凸部と隙間をもって嵌
合する第１凹溝を形成し、前記出力軸と中間リングの一
方に前記第１凸部と直交する方向に伸びる第２凸部を形
成し、他方にこの第２凸部と隙間をもって嵌合する第２
凹溝を形成し、この第１凹溝を形成した前記入力軸もし
くは中間リングと第１凸部とを径方向にのみ相対移動可
能に湾曲可能な弾性線材で前記第１凹溝と前記第１凸部
が非接触状態を維持するように前記第１凸部の円周方向
両側でそれぞれ結合し、前記第２凹溝を形成した前記出
力軸もしくは中間リングと第２凸部とを径方向にのみ相
対移動可能に湾曲可能な弾性線材で前記第２凹溝と前記
第２凸部が非接触状態を維持するように前記第２凸部の
円周方向両側でそれぞれ結合したことを特徴とする自在
継手。An intermediate ring is arranged between an input shaft and an output shaft, a first convex portion extending in a radial direction is formed on one of the intermediate ring and the input shaft, and a gap is formed between the intermediate ring and the first convex portion on the other side. A first concave groove to be fitted is formed, a second convex portion extending in a direction perpendicular to the first convex portion is formed on one of the output shaft and the intermediate ring, and the other is fitted with a gap with the second convex portion on the other. Second
The first groove and the first groove are formed of an elastic wire rod that is formed so as to be capable of relative movement only in the radial direction between the input shaft or the intermediate ring having the first groove and the first convex portion. The output shaft or intermediate ring formed with the second concave groove and the second convex portion are radially connected to each other on both circumferential sides of the first convex portion so that the convex portions maintain a non-contact state. The second concave groove and the second convex portion are coupled to each other on both circumferential sides of the second convex portion such that the second concave groove and the second convex portion are maintained in a non-contact state by an elastic wire rod that can be bent so as to be relatively movable. Universal joint.
し、この中間リングと入力軸の一方に径方向に伸びる第
１凸部を形成し、他方にこの第１凸部と隙間をもって嵌
合する第１凹溝を形成し、前記出力軸と中間リングの一
方に前記第１凸部と直交する方向に伸びる第２凸部を形
成し、他方にこの第２凸部と隙間をもって嵌合する第２
凹溝を形成し、前記第1,第２凹溝と前記第1,第２凸部が
非接触状態を維持するように前記第1,第２凸部の径方向
端面と第1,第２凹溝の軸方向端面を90゜ひねった板バネ
で結合したことを特徴とする自在継手。2. An intermediate ring is arranged between an input shaft and an output shaft, and a first convex portion extending in a radial direction is formed on one of the intermediate ring and the input shaft, and a gap is provided between the intermediate ring and the first convex portion on the other side. A first concave groove to be fitted is formed, a second convex portion extending in a direction perpendicular to the first convex portion is formed on one of the output shaft and the intermediate ring, and the other is fitted with a gap with the second convex portion on the other. Second
A concave groove is formed, and a radial end face of the first and second convex portions is connected to the first and second convex portions so that the first and second concave grooves and the first and second convex portions are kept in a non-contact state. A universal joint wherein the axial end faces of the concave grooves are joined by a leaf spring twisted by 90 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1084236A JP2772026B2 (en) | 1989-04-03 | 1989-04-03 | Universal joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1084236A JP2772026B2 (en) | 1989-04-03 | 1989-04-03 | Universal joint |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02261926A JPH02261926A (en) | 1990-10-24 |
| JP2772026B2 true JP2772026B2 (en) | 1998-07-02 |
Family
ID=13824837
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1084236A Expired - Lifetime JP2772026B2 (en) | 1989-04-03 | 1989-04-03 | Universal joint |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2772026B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5962035B2 (en) * | 2012-01-31 | 2016-08-03 | 株式会社ジェイテクト | Joint mechanism, worm reducer, and electric power steering device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4912252A (en) * | 1972-05-17 | 1974-02-02 | ||
| JPS6028837U (en) * | 1983-08-03 | 1985-02-27 | ヤンマー農機株式会社 | Combine threshing equipment |
-
1989
- 1989-04-03 JP JP1084236A patent/JP2772026B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02261926A (en) | 1990-10-24 |
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