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JP3919064B2 - Propeller shaft protective cover device - Google Patents
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JP3919064B2 - Propeller shaft protective cover device - Google Patents

Propeller shaft protective cover device Download PDF

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Publication number
JP3919064B2
JP3919064B2 JP2000386665A JP2000386665A JP3919064B2 JP 3919064 B2 JP3919064 B2 JP 3919064B2 JP 2000386665 A JP2000386665 A JP 2000386665A JP 2000386665 A JP2000386665 A JP 2000386665A JP 3919064 B2 JP3919064 B2 JP 3919064B2
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JP
Japan
Prior art keywords
protective cover
propeller shaft
chain
fitting
ring
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 - Fee Related
Application number
JP2000386665A
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Japanese (ja)
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JP2002187444A (en
Inventor
篤司 上村
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JTEKT Corp
Original Assignee
JTEKT Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by JTEKT Corp filed Critical JTEKT Corp
Priority to JP2000386665A priority Critical patent/JP3919064B2/en
Publication of JP2002187444A publication Critical patent/JP2002187444A/en
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Publication of JP3919064B2 publication Critical patent/JP3919064B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Description

【0001】
【発明の属する技術分野】
この発明は、農耕用作業機械等においてトルク伝達手段として使用されるプロペラシャフトの保護カバー装置に関する。
【0002】
【従来の技術】
従来、例えば農耕用作業機械は、トラクタに作業機をプロペラシャフト及びジョイント機構で連結し動力を伝達するようにされている。すなわち、このような動力伝達機構においては、トラクタには動力を取り出す出力軸を、作業機には入力軸を設けて動力を作業機に伝達している。また、上記プロペラシャフト及びジョイント機構が露出していると危険なため、安全性を確保する目的でプロペラシャフトの保護カバー装置が設けられている。そしてこのプロペラシャフトの保護カバーは、プロペラシャフト上に軸受を介して装着されており、上記保護カバーがプロペラシャフトの回転による慣性の作用で回転するのを防止するため、例えば特開平11−153149号公報に記載されているように、保護カバーとプロペラシャフトで連結される機械本体に係止部を設け鎖の両端部が連結された回転防止手段がある。この回転防止手段により保護カバーは回転しないがプロペラシャフトは保護カバー内で回転することになる。
【0003】
【発明が解決しようとする課題】
上記の従来の保護カバーとして通常樹脂製カバーが使用されているが、プロペラシャフトの回転に伴い保護カバーが回転しようとしたとき、回転防止手段の鎖にて回転が防止されるが、保護カバーの回転不良発生時等に鎖に過大入力が万一伝達された場合、樹脂製保護カバーの引っ張り強度が小さいため、保護カバーが破損することがある。そこで、従来は、保護カバーの回転防止手段の鎖の中間の鎖リングが切断するようにする等考慮される場合がある。しかし、この場合、保護カバーに連結された鎖が保護カバーとともに触れ回ることになり危険である。
【0004】
そこで、この発明は、保護カバーの回転防止手段の鎖が切断しても危険がないプロペラシャフトの保護カバー装置を提供することを目的とする。
【0005】
【課題を解決するための手段】
上記課題を解決するための手段として、請求項1の発明は、動力伝達用のプロペラシャフト及びジョイント機構を覆う状態で前記ジョイント機構の外周に回転自在に設けられた保護カバーと、前記プロペラシャフト及びジョイント機構が動力伝達のために連結される機械本体側の部材と前記保護カバーとに鎖の端部をそれぞれ連結してなる回転防止手段とを有するプロペラシャフトの保護カバー装置において、前記回転防止手段の鎖の複数リングのうち、保護カバーへの取付け側端部のリングを2個の半円弧部分を対向させて形成し、この2個の半円弧部分の対向端部の一端側をリング円周方向に回転自在にピンで連結するとともに、上記対向端部の他端側をしめしろ嵌合とし、このしめしろ力を鎖の他のリングの切断荷重および保護カバー破損荷重よりも小さく設定したことを特徴とする。
【0006】
また、請求項2の発明は、上記2個の半円弧部分のしめしろ嵌合が、互いの嵌合対向面にそれぞれ形成された凹凸部の嵌合からなることを特徴とする。
【0007】
【発明の実施の形態】
以下、この発明の具体的な実施の形態について図1に基づいて説明する。2は作業機(図示しない)側チューブで一方のフィッティングヨーク4内周面に基端部が固定され、3はトラクタ(図示しない)側チューブで他方のフィッティングヨーク5内周面に基端部が固定されている。このチューブ2とチューブ3とは、断面が非円形の筒形であり、チューブ3の内径にチューブ2が嵌脱自在に嵌入させて回転力を伝達するようにし、これによりプロペラシャフト1を構成している。また、上記チューブ2は十字軸6を介してスプラインヨーク8に連結され、図示しない作業機本体側部材に固定されている。同時に上記チューブ3は十字軸7を介してスプラインヨーク9に連結され、図示しないトラクタ本体側部材に固定されている。すなわち、フィッティングヨーク4,5、十字軸6,7及びスプラインヨーク8,9によりジョイント機構10,11が構成されており、上記プロペラシャフト1は上記ジョイント機構10,11を介してそれぞれ作業機側及びトラクタ側に連結されることになる。
【0008】
さらに、上記一方のフィッティングヨーク4外周面には、上記プロペラシャフト1及びジョイント機構10を覆う樹脂製保護カバー12がすべり軸受14を介して回転自在に設けられており、同様に上記他方のフィッティングヨーク5外周面には上記プロペラシャフト1及びジョイント機構11を覆う樹脂製保護カバー13がすべり軸受15を介して回転自在に設けられている。これら両保護カバー12,13の端部は互いに軸方向摺動可能に嵌合されている。
【0009】
上記保護カバー12には鎖16が止められる輪状突起部18が一体的に設けられており、この輪状突起部18に所定長さの鎖16の一端部のリング16aが嵌合固定され、鎖16の他端部のリング16bにはフック20が取り付けられ図示しない作業機側本体部に固定されている。同様に上記保護カバー13にも鎖16が止められる輪状突起部19が一体的に設けられており、この輪状突起部19に所定長さの鎖16の一端部のリング16aが嵌合固定され、鎖の他端部のリング16bにはフック20が取り付けられ図示しないトラクタ側本体部に固定されている。
【0010】
さらに、上記両樹脂製保護カバー12,13の輪状突起部18,19に嵌合固定された鎖16のリング16aは、図2に示されるように、2個の半円弧部分160,161の対向により形成されている。そして、この2個の半円弧部分160,161の対向端部の一端側160a,161aがリング円周方向に回転自在にピン162で連結されるとともに、上記対向端部の他端側160b,161bがしめしろ嵌合とされ、このしめしろ力が鎖16の他のリング16bの切断荷重および樹脂製保護カバー12,13破損荷重よりも小さく設定されている。
【0011】
また、上記リング16aのしめしろ嵌合は、例えば、2個の半円弧部分160,161の互いの嵌合対向面にそれぞれ形成された凹凸部163,164の嵌合による。すなわち、図3に示されるように、一方の半円弧部分160の嵌合面に凹部163が形成され他方の半円弧部分161の嵌合面の凸部164が嵌合され、他方の半円弧部分161の嵌合面に凹部163が形成され一方の半円弧部分160の嵌合面の凸部164が嵌合されている。そして、この凹凸163,164嵌合による合せ部高さaと凹部の半径bとの調整により、口開きが開始する荷重が調整される。
【0012】
上記樹脂製保護カバー12,13に連結されるリング16aは上述の構成となっているため、樹脂製保護カバー12,13のすべり軸受14,15の回転不良発生時等に鎖16に過大入力が万一伝達された場合、樹脂製保護カバー12,13の破損荷重および他の鎖16のリング16bの破損荷重よりも小さいしめしろ力で嵌合されたリング16aが開口して輪状突起部18,19から外れ、鎖16が樹脂製保護カバー12,13とともに触れ回ることがない。そして、万一、上記リング16aが切断された場合、鎖16の補修時には切断されたリング16aのみを交換すればよく、補修費低減につながる。
【0013】
【発明の効果】
このように、請求項1および2の発明では、樹脂製保護カバーの回転不良発生時等に保護カバーの回転防止鎖に過大入力が万一伝達された場合、鎖の保護カバー取付け側端部のリング個所にて必ず切断するようにしたため、鎖が保護カバーと触れ回ることが防止される。
【図面の簡単な説明】
【図1】本発明における一実施形態のプロペラシャフトの保護カバー装置の断面図である。
【図2】(A)は図1の保護カバー取付け側の鎖のリング平面図、(B)はリング側面図である。
【図3】図2のリングの嵌合状態図である。
【符号の説明】
1 プロペラシャフト
2 チューブ
3 チューブ
4 フィッティングヨーク
5 フィッティングヨーク
6 十字軸
7 十字軸
8 スプラインヨーク
9 スプラインヨーク
10 ジョイント機構
11 ジョイント機構
12 樹脂製保護カバー
13 樹脂製保護カバー
14 すべり軸受
15 すべり軸受
16 鎖
16a 保護カバー側の鎖のリング
160 半円弧部分
161 半円弧部分
162 ピン
163 凹部
164 凸部
18 輪状突起部
19 輪状突起部
20 フック
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a protective cover device for a propeller shaft used as a torque transmission means in an agricultural work machine or the like.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, for example, agricultural work machines are configured to transmit power by connecting a work machine to a tractor with a propeller shaft and a joint mechanism. That is, in such a power transmission mechanism, the tractor is provided with an output shaft for extracting power, and the work machine is provided with an input shaft to transmit power to the work machine. Further, since the propeller shaft and the joint mechanism are exposed, it is dangerous, and a protective cover device for the propeller shaft is provided for the purpose of ensuring safety. The protective cover of the propeller shaft is mounted on the propeller shaft via a bearing. For example, in order to prevent the protective cover from rotating due to the inertia caused by the rotation of the propeller shaft, for example, Japanese Patent Application Laid-Open No. 11-153149. As described in the publication, there is an anti-rotation means in which a locking portion is provided on a machine body connected by a protective cover and a propeller shaft, and both ends of the chain are connected. Although the protective cover does not rotate by this rotation preventing means, the propeller shaft rotates within the protective cover.
[0003]
[Problems to be solved by the invention]
A resin cover is usually used as the above conventional protective cover, but when the protective cover is about to rotate as the propeller shaft rotates, rotation is prevented by the chain of anti-rotation means. If an excessive input is transmitted to the chain when rotation failure occurs, the protective cover may be damaged because the tensile strength of the resin protective cover is low. Therefore, conventionally, there is a case where a chain ring in the middle of the chain of the rotation preventing means of the protective cover is cut. However, in this case, the chain connected to the protective cover touches with the protective cover, which is dangerous.
[0004]
Accordingly, an object of the present invention is to provide a protective cover device for a propeller shaft that is free from danger even if the chain of the rotation prevention means of the protective cover is broken.
[0005]
[Means for Solving the Problems]
As means for solving the above-mentioned problems, the invention of claim 1 includes a protective cover rotatably provided on an outer periphery of the joint mechanism in a state of covering the propeller shaft for power transmission and the joint mechanism, the propeller shaft, in the protective cover device of a propeller shaft having a rotation preventing means for the joint mechanism formed by connecting respective ends of the chain and the protective cover and the machine body side member connected to the power transmission, the rotation stopper Of the plurality of rings of the chain of means, the ring at the end portion on the side attached to the protective cover is formed with two semicircular arc portions facing each other, and one end side of the opposite end portions of the two semicircular arc portions is formed in a ring circle It is connected with a pin so as to be rotatable in the circumferential direction, and the other end side of the opposite end portion is fitted with an interference fit, and this interference force is used as a cutting load for other rings of the chain and a protective cover. Characterized by being smaller than the breakage load.
[0006]
The invention according to claim 2 is characterized in that the interference fitting of the two semicircular arc portions includes fitting of uneven portions respectively formed on the fitting facing surfaces.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
A specific embodiment of the present invention will be described below with reference to FIG. Reference numeral 2 denotes a work machine (not shown) side tube whose base end is fixed to the inner peripheral surface of one fitting yoke 4, and reference numeral 3 denotes a tractor (not shown) side tube which has a base end portion on the inner peripheral surface of the other fitting yoke 5. It is fixed. The tube 2 and the tube 3 are cylindrical with a non-circular cross section, and the tube 2 is detachably inserted into the inner diameter of the tube 3 so as to transmit the rotational force, thereby forming the propeller shaft 1. ing. The tube 2 is connected to a spline yoke 8 through a cross shaft 6 and fixed to a work machine main body side member (not shown). At the same time, the tube 3 is connected to a spline yoke 9 via a cross shaft 7 and fixed to a tractor body side member (not shown). That is, the joint mechanisms 10 and 11 are constituted by the fitting yokes 4 and 5, the cross shafts 6 and 7 and the spline yokes 8 and 9, and the propeller shaft 1 is connected to the work machine side and the joint mechanism 10 and 11, respectively. It will be connected to the tractor side.
[0008]
Further, a resin protective cover 12 covering the propeller shaft 1 and the joint mechanism 10 is rotatably provided on the outer peripheral surface of the one fitting yoke 4 via a slide bearing 14, and similarly the other fitting yoke 4 is provided. A resin protective cover 13 that covers the propeller shaft 1 and the joint mechanism 11 is rotatably provided on the outer peripheral surface via a slide bearing 15. The ends of these protective covers 12 and 13 are fitted to each other so as to be slidable in the axial direction.
[0009]
The protective cover 12 is integrally provided with a ring-shaped protrusion 18 for stopping the chain 16, and a ring 16 a at one end of the chain 16 having a predetermined length is fitted and fixed to the ring-shaped protrusion 18. A hook 20 is attached to the ring 16b at the other end of the work piece, and is fixed to a work machine side main body (not shown). Similarly, the protective cover 13 is also integrally provided with a ring-shaped protrusion 19 for stopping the chain 16, and a ring 16 a at one end of the chain 16 having a predetermined length is fitted and fixed to the ring-shaped protrusion 19. A hook 20 is attached to the ring 16b at the other end of the chain and is fixed to a tractor side main body (not shown).
[0010]
Further, the ring 16a of the chain 16 fitted and fixed to the ring-shaped protrusions 18 and 19 of the two resin protective covers 12 and 13 is opposed to the two semicircular arc portions 160 and 161 as shown in FIG. It is formed by. The one end sides 160a and 161a of the opposing end portions of the two semicircular arc portions 160 and 161 are connected by pins 162 so as to be rotatable in the ring circumferential direction, and the other end sides 160b and 161b of the opposing end portions. The interference fitting force is set to be smaller than the cutting load of the other ring 16b of the chain 16 and the breakage load of the resin protective covers 12 and 13.
[0011]
Further, the interference fit of the ring 16a is, for example, by fitting of the concave and convex portions 163 and 164 formed on the fitting facing surfaces of the two semicircular arc portions 160 and 161, respectively. That is, as shown in FIG. 3, a concave portion 163 is formed on the fitting surface of one semicircular arc portion 160, and a convex portion 164 of the fitting surface of the other semicircular arc portion 161 is fitted, so that the other semicircular arc portion is fitted. A concave portion 163 is formed on the fitting surface 161, and a convex portion 164 on the fitting surface of one semicircular arc portion 160 is fitted. Then, the load at which the opening of the mouth starts is adjusted by adjusting the mating portion height a and the concave portion radius b by fitting the concave and convex portions 163 and 164.
[0012]
Since the ring 16a connected to the resin protective covers 12 and 13 has the above-described configuration, an excessive input is applied to the chain 16 when the sliding bearings 14 and 15 of the resin protective covers 12 and 13 are not rotated. If transmitted, the ring 16a fitted with an interference force smaller than the damage load of the resin protective covers 12 and 13 and the damage load of the ring 16b of the other chain 16 is opened and the ring-shaped protrusions 18, The chain 16 is not touched with the protective covers 12 and 13 made of resin. If the ring 16a is cut, only the cut ring 16a needs to be replaced when the chain 16 is repaired, leading to a reduction in repair costs.
[0013]
【The invention's effect】
Thus, in the inventions of claims 1 and 2, if an excessive input is transmitted to the anti-rotation chain of the protective cover in the event of a rotation failure of the resin protective cover, etc., The chain is always cut at the ring, so that the chain is prevented from touching the protective cover.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a protective cover device for a propeller shaft according to an embodiment of the present invention.
2A is a ring plan view of a chain on the protective cover mounting side of FIG. 1, and FIG. 2B is a side view of the ring.
FIG. 3 is a diagram showing a fitting state of the ring of FIG. 2;
[Explanation of symbols]
1 Propeller shaft 2 Tube 3 Tube 4 Fitting yoke 5 Fitting yoke 6 Cross shaft 7 Cross shaft 8 Spline yoke 9 Spline yoke 10 Joint mechanism 11 Joint mechanism 12 Resin protective cover 13 Resin protective cover 14 Slide bearing 15 Slide bearing 16 Chain 16a Ring 160 of the chain on the protective cover side Semicircular arc part 161 Semicircular arc part 162 Pin 163 Concave part 164 Convex part 18 Annular projection part 19 Annular projection part 20 Hook

Claims (2)

動力伝達用のプロペラシャフト及びジョイント機構を覆う状態で前記ジョイント機構の外周に回転自在に設けられた保護カバーと、前記プロペラシャフト及びジョイント機構が動力伝達のために連結される機械本体側の部材と前記保護カバーとに鎖の端部をそれぞれ連結してなる回転防止手段とを有するプロペラシャフトの保護カバー装置において、前記回転防止手段の鎖の複数リングのうち、保護カバーへの取付け側端部のリングを2個の半円弧部分を対向させて形成し、この2個の半円弧部分の対向端部の一端側をリング円周方向に回転自在にピンで連結するとともに、上記対向端部の他端側をしめしろ嵌合とし、このしめしろ力を鎖の他のリングの切断荷重および保護カバー破損荷重よりも小さく設定したことを特徴とするプロペラシャフトの保護カバー装置。 A protective cover rotatably provided on the outer periphery of the joint mechanism in a state of covering the power transmission propeller shaft and the joint mechanism, and a machine body side member to which the propeller shaft and the joint mechanism are coupled for power transmission; in the protective cover device of a propeller shaft having a rotation preventing means comprising a respective end of the chain and the protective cover are connected respectively, among the plurality rings of the chain of said anti-rotation means, attached end to the protective cover The two semicircular arc portions are formed to face each other, and one end side of the opposing end portions of the two semicircular arc portions are coupled by a pin so as to be rotatable in the ring circumferential direction, and Propeller characterized in that the other end side is an interference fit and the interference force is set smaller than the cutting load of other rings of the chain and the protective cover breakage load. Protection cover device of Yafuto. 上記2個の半円弧部分のしめしろ嵌合が、互いの嵌合対向面にそれぞれ形成された凹凸部の嵌合からなることを特徴とする請求項1に記載のプロペラシャフトの保護カバー装置。The protective cover device for a propeller shaft according to claim 1, wherein the interference fitting of the two semicircular arc portions includes fitting of concave and convex portions formed respectively on the fitting facing surfaces.
JP2000386665A 2000-12-20 2000-12-20 Propeller shaft protective cover device Expired - Fee Related JP3919064B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2000386665A JP3919064B2 (en) 2000-12-20 2000-12-20 Propeller shaft protective cover device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2000386665A JP3919064B2 (en) 2000-12-20 2000-12-20 Propeller shaft protective cover device

Publications (2)

Publication Number Publication Date
JP2002187444A JP2002187444A (en) 2002-07-02
JP3919064B2 true JP3919064B2 (en) 2007-05-23

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Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3135939A1 (en) 2015-08-25 2017-03-01 Tirsan Kardan Sanayi Ve Ticaret Anonim Sirketi An additional embodiment in cardan shaft sliding group
CN106949137A (en) * 2017-02-22 2017-07-14 李赵和 A kind of transmission shaft fixed device with protective value
CN116872650B (en) * 2023-09-05 2023-11-14 潍坊德佑传动机械有限公司 Agricultural machine driving axle

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