JPH0694052A - Safety device of outboard motor - Google Patents

Safety device of outboard motor

Info

Publication number
JPH0694052A
JPH0694052A JP4242190A JP24219092A JPH0694052A JP H0694052 A JPH0694052 A JP H0694052A JP 4242190 A JP4242190 A JP 4242190A JP 24219092 A JP24219092 A JP 24219092A JP H0694052 A JPH0694052 A JP H0694052A
Authority
JP
Japan
Prior art keywords
propeller
retainer
engaging
roller
outer 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.)
Pending
Application number
JP4242190A
Other languages
Japanese (ja)
Inventor
Hiroshi Mihata
洋 御幡
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.)
NTN Corp
Original Assignee
NTN Corp
NTN Toyo Bearing Co Ltd
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 NTN Corp, NTN Toyo Bearing Co Ltd filed Critical NTN Corp
Priority to JP4242190A priority Critical patent/JPH0694052A/en
Publication of JPH0694052A publication Critical patent/JPH0694052A/en
Pending legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02BINTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B61/00Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing
    • F02B61/04Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing for driving propellers
    • F02B61/045Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing for driving propellers for marine engines

Landscapes

  • Engineering & Computer Science (AREA)
  • Ocean & Marine Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • One-Way And Automatic Clutches, And Combinations Of Different Clutches (AREA)

Abstract

PURPOSE:To provide a safety device that interrupts the transfer of excessive load toward a driving mechanism from a propeller and simultaneously can be reset to a normal torque transfer state automatically, in the outboard motor. CONSTITUTION:A cylindrical surface 5 is formed in an inner ring 1 being connected to a propeller shaft C and an engaging surface 9 by a plate spring 7 in an outer ring 2 being connected to a propeller D, respectively, and a roller 13 is assembled in a retainer 14 installed in space between both these rings 1 and 2. The retainer 14 is deformed in the radial direction by a cylindrical roller 22 pressed-in between the inner ring 1 and the retainer 14, then both circular parts 17 and 19 installed in relation to the retainer 14 and the outer ring 2 are made contact with each other. In this structure intact, if excessive load is added to the propeller D, the plate spring 7 deforms and the roller passes through an engaging position and then the retainer 14 performs its rolling motion with the circular part 19 of the outer ring 2 as the center, producing a creep there, and thereby the roller 13 is shifted up to the next engaging position.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】この発明は、船外機の駆動部にプ
ロペラから過大なトルクが加わることを防止した安全装
置に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a safety device which prevents an excessive torque from being applied to a drive section of an outboard motor by a propeller.

【0002】[0002]

【従来の技術】従来の船外機は、図11に示すようにプ
ロペラ推進軸Cに、プロペラDと連結するブッシュGを
嵌合させ、プロペラ推進軸Cにその軸線に直交して挿通
させたシャーピンHの両端部を、上記ブッシュGの係合
溝I、Iに係合して、プロペラ推進軸Cの回転をシャー
ピンH、ブッシュGを介してプロペラDに伝達する構造
がとられている。
2. Description of the Related Art In a conventional outboard motor, as shown in FIG. 11, a propeller propelling shaft C is fitted with a bush G connecting to the propeller D, and the propeller propelling shaft C is inserted perpendicularly to its axis. A structure is adopted in which both ends of the shear pin H are engaged with the engagement grooves I of the bush G, and the rotation of the propeller propelling shaft C is transmitted to the propeller D via the shear pin H and the bush G.

【0003】上記の船外機では、プロペラDに海草が絡
み付いたり、漂流物や岩石等が接触して、プロペラの回
転を阻止するような大きな負荷が加わった場合、その負
荷がプロペラ推進軸Cやエンジン等の駆動機構の構成部
品に損傷を及ぼすほど大きいものであると、シャーピン
Hが折損してプロペラ推進軸CとプロペラDを空回りさ
せ、上記駆動機構の損傷を未然に防止するようになって
いる。
In the above outboard motor, when seagrass is entangled with the propeller D or a heavy load such as drifting objects or rocks comes into contact with the propeller D to impede the rotation of the propeller, the propeller propeller shaft C If it is large enough to damage the components of the drive mechanism such as the engine and the engine, the shear pin H breaks and the propeller propulsion shaft C and the propeller D run idle to prevent damage to the drive mechanism. ing.

【0004】[0004]

【発明が解決しようとする課題】ところが、シャーピン
のせん断破損を利用した安全装置においては、過大な負
荷の発生によりシャーピンHが一旦破壊されると、動力
の伝達が全く不可能になり、船外機による航行は出来な
くなる不具合がある。
However, in the safety device utilizing shear damage of the shear pin, once the shear pin H is destroyed due to the occurrence of excessive load, transmission of power becomes completely impossible and the outboard. There is a problem that navigation by aircraft is not possible.

【0005】また、破壊したシャーピンの取り替え作業
は、海上で揺動する船舶に対して行なう必要があるた
め、作業に危険が伴い、加えて復旧作業中、船舶は漂流
状態となるため、岩場等への衝突や、周辺の他の船舶に
危害を及ぼしやすい問題がある。
Further, since the work of replacing a damaged shearing pin must be performed on a ship swinging at sea, the work is dangerous and, in addition, the ship is in a drifting state during the recovery work, so that a rocky place or the like is required. There is a problem that it is likely to collide with and damage other ships in the vicinity.

【0006】さらに、シャーピンHを交換した後でも、
漂流物等の過負荷の原因がある海域ではシャーピンのせ
ん断破損が継続して発生する場合があり、このため、予
備のピンを装備していても、安定した航行に問題が生じ
る場合がある。
Furthermore, even after replacing the shear pin H,
Shear pins may continue to be sheared and broken in sea areas where there are overloads such as floating debris, which may cause problems in stable navigation even with spare pins.

【0007】そこで、この発明は、プロペラから駆動機
構へ過大な負荷が伝わることを防止すると共に、正常な
トルク伝達状態への復帰を容易に行なうことができる安
全装置を提供することを目的としている。
Therefore, an object of the present invention is to provide a safety device capable of preventing an excessive load from being transmitted from a propeller to a drive mechanism and easily returning to a normal torque transmission state. .

【0008】[0008]

【課題を解決するための手段】上記の課題を解決するた
め、この発明は、プロペラ推進軸にプロペラを相対回転
可能に取付け、そのプロペラ推進軸とプロペラの間に、
自動復帰機能を備えるトルクリミッタを組込んだもので
ある。
In order to solve the above-mentioned problems, the present invention has a propeller propelling shaft to which a propeller is relatively rotatably mounted, and between the propeller propelling shaft and the propeller,
It incorporates a torque limiter with an automatic return function.

【0009】また、この発明の第2の手段は、上記トル
クリミッタを、プロペラ推進軸に連結する軌道輪とプロ
ペラに連結する軌道輪との間に係合子を保持する保持器
を設け、上記両軌道輪の対向する面の一方に円筒面を、
他方に上記円筒面との間で係合子を係合させる係合面を
設け、上記係合面を弾性変形可能に形成し、上記保持器
に、プロペラ推進軸の回転を減速して伝える減速手段を
連結して構成したのである。
The second means of the present invention is to provide a retainer for holding the engaging element between the bearing ring connecting the torque limiter to the propeller propulsion shaft and the bearing ring connecting to the propeller. Cylindrical surface on one of the facing surfaces of the bearing ring,
On the other side, an engaging surface for engaging the engaging element with the cylindrical surface is provided, the engaging surface is elastically deformable, and decelerating means for decelerating and transmitting the rotation of the propeller propulsion shaft to the cage. It was configured by connecting.

【0010】さらに、第3の手段は、上記減速手段を、
プロペラに連結する軌道輪と保持器とにそれぞれ共回り
するように関連させて設けられ、互いにすき間をもって
内外に嵌合する円環部と、上記保持器とプロペラ推進軸
に連結する軌道輪との間に圧入され、上記保持器に関連
した円環部を変形させて両円環部を接触させる転動体と
から構成したのである。
Further, a third means is the above-mentioned speed reducing means,
A ring portion that is provided so as to be associated with the bearing ring and the cage that are connected to the propeller so as to rotate together, and that fits inside and outside with a gap, and a bearing ring that is linked to the cage and the propeller propulsion shaft. The rolling element is press-fitted in between and deforms the annular portion associated with the cage to bring both annular portions into contact with each other.

【0011】また、この発明の第4の手段は、上記係合
面に、係合子が円周方向に嵌まり込む凹所を設け、その
凹所の両側に係合子の係合部を形成した構造を採用した
のである。
According to a fourth aspect of the present invention, the engaging surface is provided with a recess into which the engaging member is fitted in the circumferential direction, and the engaging portions of the engaging member are formed on both sides of the recess. The structure was adopted.

【0012】[0012]

【作用】上記構造で成る安全装置においては、プロペラ
に加わる負荷がトルクリミッタの設定トルクを越える
と、トルク伝達が切れ、プロペラ推進軸とプロペラが空
回りする。一方、トルク伝達が切れたトルクリミッタ
は、再び自動的に復帰し、トルク伝達状態を復旧させ
る。
In the safety device having the above structure, when the load applied to the propeller exceeds the torque set by the torque limiter, the torque transmission is cut off and the propeller propulsion shaft and the propeller run idle. On the other hand, the torque limiter that has lost the torque transmission automatically returns again to restore the torque transmission state.

【0013】また、上記第2の手段では、プロペラ推進
軸とプロペラと連結する軌道輪が相対回転すると、係合
子が円筒面と係合面の間に係合し、両軌道輪を一体で回
転させる。この状態でプロペラに過負荷が加わると、係
合面が弾性変形し、係合子が円筒面と係合面の係合位置
を通過して、トルク伝達が開放される。通過した係合子
は、保持器によって次の係合位置に向かって移動される
が、保持器が減速手段により駆動側の軌道輪に対して減
速されるため、係合子は低速で移動し、長い時間をかけ
て次の係合位置まで移動する。
In the second means, when the propeller propelling shaft and the bearing ring connected to the propeller rotate relative to each other, the engaging element engages between the cylindrical surface and the engaging surface to rotate both bearing rings integrally. Let When an overload is applied to the propeller in this state, the engagement surface is elastically deformed, the engagement element passes through the engagement positions of the cylindrical surface and the engagement surface, and the torque transmission is released. The passed engagement element is moved toward the next engagement position by the retainer, but since the retainer is decelerated with respect to the drive-side bearing ring by the reduction mechanism, the engagement element moves at a low speed and is long. It moves to the next engagement position over time.

【0014】一方、上記第3の手段においては、保持器
が係合子を次の係合位置まで移動させる場合、保持器
は、接触した両円環部の転がりにより回転移動される
が、この場合、内外に嵌合する円環部同士が接触転がり
すると、クリープが生じ、両円環部は1回転で嵌合すき
間に円周率を乗じた距離だけ円周方向に相対移動する。
したがって、上記嵌合すき間を、両円環部の呼び径寸法
に対して十分に小さい値で設定することにより、係合子
が次の係合位置に達するまでの時間を著しく長くするこ
とができる。
On the other hand, in the third means, when the retainer moves the engagement element to the next engagement position, the retainer is rotationally moved by the rolling of both of the contacting annular portions. When the inner and outer ring-shaped tongues contact each other and roll, creep occurs, and the two ring-shaped parts relatively move in the circumferential direction by the distance multiplied by the pi in the fitting gap in one rotation.
Therefore, by setting the fitting gap to a value that is sufficiently smaller than the nominal diameter dimension of both annular portions, it is possible to remarkably lengthen the time until the engagement element reaches the next engagement position.

【0015】また、上記第4の手段では、係合面の凹所
に嵌まり込んだ状態で係合子が正逆いずれかの方向に回
転すると、凹所の両側の係合部と係合し、トルク伝達を
行なうことができる。
In the fourth means, when the engaging element is rotated in either the forward or reverse direction while being fitted in the recess of the engaging surface, the engaging element engages with the engaging portions on both sides of the recess. , Torque transmission can be performed.

【0016】[0016]

【実施例】図1乃至図6は、この発明の第1の実施例を
示している。図1及び図2において、Aは、エンジンと
連結する船外機のドライブシャフトであり、このドライ
ブシャフトAに、ベベルギヤの組み合わせから成るギヤ
機構B、B’を介して逆転用と正転用のプロペラ推進軸
C、C’が接続されている。また、各プロペラ推進軸
C、C’の端部には、周面にプロペラDを設けたプロペ
ラハウジングEが回転可能に嵌着され、そのハウジング
Eとプロペラ推進軸C、C’の間に、自動復帰機能付の
トルクリミッタFが組み込まれている。
1 to 6 show a first embodiment of the present invention. In FIG. 1 and FIG. 2, A is a drive shaft of an outboard motor that is coupled to an engine, and a propeller for reverse rotation and forward rotation is mounted on the drive shaft A via a gear mechanism B, B'composed of a combination of bevel gears. The propulsion shafts C and C'are connected. Further, a propeller housing E having a propeller D on its peripheral surface is rotatably fitted to the ends of the propeller propulsion shafts C and C ′, and between the housing E and the propeller propulsion shafts C and C ′. A torque limiter F with an automatic return function is incorporated.

【0017】上記トルクリミッタFは、図2乃至図5に
示すように、プロペラ推進軸Cにキー26を介して連結
する内軸1と、プロペラハウジングEの内径面に圧入固
定される外輪2を嵌合させ、その内輪1と外輪2の一端
を軸受3と蓋部材18により、他端を軸受4と軸受箱2
3により回転自在に支持している。
As shown in FIGS. 2 to 5, the torque limiter F includes an inner shaft 1 which is connected to a propeller propelling shaft C via a key 26 and an outer ring 2 which is press-fitted and fixed to an inner diameter surface of a propeller housing E. The inner ring 1 and the outer ring 2 are fitted to each other at one end by the bearing 3 and the lid member 18, and at the other end by the bearing 4 and the bearing housing 2.
It is rotatably supported by 3.

【0018】上記内輪1の中央部の外径面は、円筒面5
で形成され、その円筒面5に対向する外輪2の内径面に
は、円周方向に等間隔で8ケ所の切欠き6が形成されて
おり、その各切欠き6に、ほぼ正八角形のリング状をし
た板ばね7が組込まれている。
The outer diameter surface of the central portion of the inner ring 1 is a cylindrical surface 5
Formed on the inner surface of the outer ring 2 facing the cylindrical surface 5, eight notches 6 are formed at equal intervals in the circumferential direction, and each notch 6 has a substantially regular octagonal ring. A leaf spring 7 having a shape is incorporated.

【0019】この板ばね7は、8等分に分割されたばね
板8で形成されており、その各ばね板8の内面が、内輪
1の円筒面5との間でくさび形空間をなす係合面9を形
成している。また、上記各ばね板8は、外輪2の各切欠
き6の間でわずかに締まり嵌めの状態で組込まれ、各ば
ね板8と外輪2の内径面との間には、ばね板8の変形を
許容するぬすみ24が設けられている。
The leaf spring 7 is formed of spring plates 8 divided into eight equal parts, and the inner surface of each spring plate 8 engages with the cylindrical surface 5 of the inner ring 1 to form a wedge-shaped space. Forming surface 9. The spring plates 8 are assembled in a slightly interference fit between the notches 6 of the outer ring 2, and the spring plates 8 are deformed between the spring plates 8 and the inner diameter surface of the outer ring 2. Is provided to allow the above.

【0020】上記各ばね板8の中央部には、外輪2に向
かって折れ曲がる凹所10が形成され、その凹所10
に、後述する係合子としてのローラ13が嵌まり込むよ
うになっている。上記凹所10の内面は、円周方向に対
して同じ角度θで逆方向に傾斜する傾斜面11、12で
形成され、その両傾斜面11、12と円筒面5の間にロ
ーラ13が嵌合すると、各ばね板8がわずかに撓み、弾
性力によりローラ13を内輪1に向かって押し付けてい
る。また、上記凹所10の両側と円筒面5の間には、係
合面9と円筒面5間の最小すきま部a、aが形成されて
おり、その最小すきま部a、aの寸法が、ローラ13の
径寸法よりも小さく設定されている。
A recess 10 is formed at the center of each spring plate 8 and is bent toward the outer ring 2.
A roller 13 as an engaging element, which will be described later, is fitted into the. The inner surface of the recess 10 is formed by inclined surfaces 11 and 12 which are inclined in the opposite directions at the same angle θ with respect to the circumferential direction, and the roller 13 is fitted between the inclined surfaces 11 and 12 and the cylindrical surface 5. When fitted together, each spring plate 8 is slightly bent, and the roller 13 is pressed against the inner ring 1 by the elastic force. Further, the minimum clearances a, a between the engagement surface 9 and the cylindrical surface 5 are formed between both sides of the recess 10 and the cylindrical surface 5, and the dimensions of the minimum clearances a, a are It is set smaller than the diameter of the roller 13.

【0021】また、上記板ばね7と円筒面5の間には、
保持器14が設けられ、その保持器14の周面に、等間
隔で多数のポケット15が設けられており、その各ポケ
ット15に、係合子としてのローラ13が組込まれてい
る。
Further, between the leaf spring 7 and the cylindrical surface 5,
A cage 14 is provided, and a large number of pockets 15 are provided at equal intervals on the peripheral surface of the cage 14, and the rollers 13 as the engaging elements are incorporated in the respective pockets 15.

【0022】このローラ13は、上記係合面9と円筒面
5間の最小すきま部aの近傍でのみ係合面9と円筒面5
に係合し、ばね板8がぬすみ24側に撓んだ時には、そ
のばね板8と円筒面5間にできる間隔をローラ13が通
過できるようになっている。
The roller 13 has the engagement surface 9 and the cylindrical surface 5 only near the minimum clearance a between the engagement surface 9 and the cylindrical surface 5.
When the spring plate 8 is bent to the side of the recess 24, the roller 13 can pass through the space formed between the spring plate 8 and the cylindrical surface 5.

【0023】また、上記保持器14の先端部は、軸受3
側に突出しており、その突出部分14aに、クリープ外
輪16が連結されている。このクリープ外輪16は、内
径面に内外輪と同軸の円環部17が形成され、その端部
と上記突出部分14aの外径面に設けた凹凸部25とを
嵌合させて保持器14に締まり嵌めされており、その嵌
合によってクリープ外輪16と保持器14は、軸方向に
は移動不可であるが、回転方向には所定のトルクで相対
回転可能なように連結されている。
The tip of the retainer 14 has a bearing 3
The creep outer ring 16 is connected to the projecting portion 14a. The creep outer ring 16 has an annular portion 17 formed on the inner diameter surface thereof and coaxial with the inner and outer rings. The end portion of the annular outer ring portion 17 and the uneven portion 25 provided on the outer diameter surface of the projecting portion 14a are fitted to each other to the retainer 14. The creep outer ring 16 and the cage 14 are immovable in the axial direction due to the interference fit, but are coupled so as to be relatively rotatable with a predetermined torque in the rotational direction.

【0024】また、外輪2の先端部に圧入される蓋部材
18には、クリープ外輪16の内側に嵌まり込む環状突
起18aが形成され、その環状突起18aの外径面に、
上記円環部17に嵌合する円環部19が形成されてい
る。上記円環部17と円環部19の嵌合すき間δは、円
環部17の内径寸法と円環部19の外径寸法の呼び径寸
法Dに対して数百分の1以下の値で設定されている。
The lid member 18 press-fitted to the tip of the outer ring 2 is formed with an annular projection 18a which fits inside the creep outer ring 16, and the outer surface of the annular projection 18a is
An annular portion 19 that fits into the annular portion 17 is formed. The fitting gap δ between the annular portion 17 and the annular portion 19 is a value of several hundredths or less of the nominal diameter dimension D of the inner diameter dimension of the annular portion 17 and the outer diameter dimension of the annular portion 19. It is set.

【0025】一方、上記クリープ外輪16と内輪1の円
筒面5との間には、図1及び図2に示すように円筒ころ
軸受20が組込まれている。この円筒ころ軸受20は、
環状のころ保持器21と、そのころ保持器21により円
周方向に120度間隔で配置される3個の円筒ころ22
とから成り、この円筒ころ22の転がりにより保持器1
4を内輪1に対して回転案内する。
On the other hand, a cylindrical roller bearing 20 is incorporated between the creep outer ring 16 and the cylindrical surface 5 of the inner ring 1 as shown in FIGS. This cylindrical roller bearing 20 is
An annular roller cage 21 and three cylindrical rollers 22 arranged at 120 degree intervals in the circumferential direction by the roller cage 21.
And the cage 1 is formed by rolling the cylindrical roller 22.
4 is rotated and guided with respect to the inner ring 1.

【0026】また、上記円筒ころ22は、クリープ外輪
16と内輪1の間で圧入状態で組込まれており、その円
筒ころ22の圧入により、クリープ外輪16が円筒ころ
22を頂点として変形し、その変形部分で円環部17が
外輪2の円環部19と線接触するようになっている。
The cylindrical roller 22 is assembled between the creep outer ring 16 and the inner ring 1 in a press-fitted state, and the press-fitting of the cylindrical roller 22 causes the creep outer ring 16 to deform with the cylindrical roller 22 as an apex. The annular portion 17 is in line contact with the annular portion 19 of the outer ring 2 at the deformed portion.

【0027】この実施例の船外機の安全装置は上記のよ
うな構造であり、次にその作用を説明する。
The outboard motor safety device of this embodiment has the above-described structure, and its operation will be described below.

【0028】図2及び図5に示すように、トルクリミッ
タFにおける各ばね板8の凹所10にそれぞれローラ1
3が嵌まり込んだ状態で、プロペラ推進軸C(内輪1)
が左回りに回転すると、ローラ13が凹所10の左側の
傾斜面11と円筒面5に噛み込んでストラット角θのク
ラッチが成立し、外輪2が内輪1と一体で回転する。逆
に、図5の状態からプロペラ推進軸Cが右回りに回転す
ると、凹所10の右側の傾斜面12と円筒面5の間にロ
ーラ13が噛み込み、ストラット角θのクラッチが成立
する。すなわち、プロペラ推進軸Cが左右いずれの方向
に回転しても、クラッチが成立し、プロペラDにトルク
が伝達される。
As shown in FIGS. 2 and 5, the rollers 1 are respectively provided in the recesses 10 of the spring plates 8 in the torque limiter F.
Propeller propulsion shaft C (inner ring 1) with 3 fitted
When the wheel rotates counterclockwise, the roller 13 bites into the inclined surface 11 on the left side of the recess 10 and the cylindrical surface 5 to establish a clutch having a strut angle θ, and the outer ring 2 rotates integrally with the inner ring 1. Conversely, when the propeller propelling shaft C rotates clockwise from the state shown in FIG. 5, the roller 13 is caught between the inclined surface 12 on the right side of the recess 10 and the cylindrical surface 5, and the clutch having the strut angle θ is established. That is, regardless of whether the propeller propelling shaft C rotates in the left or right direction, the clutch is established and the torque is transmitted to the propeller D.

【0029】上記のクラッチの成立状態から、プロペラ
D(外輪2)に負荷するトルクが大きくなると、板ばね
7がぬすみ24側に撓み、ストラット角θの減少と共に
負荷できるトルクが小さくなる。そして、過負荷が継続
すると、ローラ13が最小すきま部aを通過し、クラッ
チとして作用していた凹所10の外側に放出されてクラ
ッチ機能を失う。
When the torque applied to the propeller D (outer ring 2) increases from the above-mentioned clutch engaged state, the leaf spring 7 bends toward the recess 24, and the torque that can be applied decreases as the strut angle θ decreases. Then, when the overload continues, the roller 13 passes through the minimum clearance portion a and is discharged to the outside of the recess 10 acting as a clutch, and the clutch function is lost.

【0030】上記のトルク伝達が開放された状態で、プ
ロペラ推進軸Cが回転を続け、内輪1と外輪2が相対回
転すると、内輪1の回転荷重が円筒ころ22を介してク
リープ外輪16に伝わる。このため、円環部17が外輪
2の円環部19の外径に対して転がり運動をし、クリー
プを生じる。すなわち、円環部17の内側を円筒ころ2
2が一周した時、円環部17と円環部19は嵌合すき間
δに円周率πを乗じた量πδだけ相対回転する。この場
合、前述したように嵌合すき間δの値を円環部17、1
9の呼び径に対して数百分の1以下の小さな値で設定し
てあるので、保持器14は内輪1の回転に対して著しく
低い速度で回転し、ローラ13を微少な距離ずつ移動さ
せる。
When the propeller propelling shaft C continues to rotate while the above torque transmission is released and the inner ring 1 and the outer ring 2 rotate relative to each other, the rotational load of the inner ring 1 is transmitted to the creep outer ring 16 via the cylindrical rollers 22. . Therefore, the annular portion 17 makes a rolling motion with respect to the outer diameter of the annular portion 19 of the outer ring 2 to cause creep. That is, the inside of the annular portion 17 is
When 2 goes around once, the annular portion 17 and the annular portion 19 rotate relative to each other by an amount πδ obtained by multiplying the fitting clearance δ by the pi. In this case, as described above, the value of the fitting clearance δ is set to the annular portion 17, 1
Since it is set to a small value of several hundredths or less of the nominal diameter of 9, the cage 14 rotates at a remarkably low speed with respect to the rotation of the inner ring 1 and moves the roller 13 by a minute distance. .

【0031】したがって、プロペラDの異常事態によっ
てトルクリミッタFが停止した後、長い時間をおいてロ
ーラ13が次の係合位置に到達することになり、十分な
時間的余裕をもった自動復帰を繰り返すことができる。
例えば、航海中に漂流中の材料や岩場等にプロペラDが
接触し、動力伝達が遮断された場合、トルクリミッタF
は一定の所要時間そのトルク解放状態を維持するので、
船舶は慣性力によって航行を続け、その間に海草等の漂
流位置や岩場から脱出することができる。そして、所定
時間の経過後トルクリミッタFがトルク伝達状態に復帰
するため、自動的にプロペラDが回転を始め、航行を続
行することが可能となる。
Therefore, after the torque limiter F is stopped due to the abnormal situation of the propeller D, the roller 13 reaches the next engagement position after a long time, and the automatic return with a sufficient time margin is performed. Can be repeated.
For example, if the propeller D comes into contact with a drifting material or a rocky place during voyage and the power transmission is interrupted, the torque limiter F
Keeps its torque released for a certain time,
The ship can continue to sail by inertial force, and can escape from the drifting position of seagrass or the rocky area during that time. Then, after the elapse of a predetermined time, the torque limiter F returns to the torque transmission state, so that the propeller D automatically starts to rotate and it is possible to continue the navigation.

【0032】図7は、第2の実施例を示し、この例で
は、係合面9を形成する各ばね板8の中央部分に、円筒
面5に向かう突起31を設けている。この突起31は、
内向きに対称に傾斜する2つの傾斜面32、33から形
成され、その傾斜面32、33と円筒面5の接線とのな
す角度を、ローラ13を傾斜面32、33と円筒面5の
間で挾み込んでクラッチとして作用するような角度で設
定している。
FIG. 7 shows a second embodiment. In this example, a protrusion 31 directed toward the cylindrical surface 5 is provided at the central portion of each spring plate 8 forming the engagement surface 9. This protrusion 31
It is formed from two inclined surfaces 32 and 33 that are symmetrically inclined inward, and the angle formed between the inclined surfaces 32 and 33 and the tangent of the cylindrical surface 5 is set between the inclined surfaces 32 and 33 of the roller 13 and the cylindrical surface 5. The angle is set so that it will slip in and act as a clutch.

【0033】他の構造は、上述した第1の実施例と同じ
であり、同一部品には同一の符号を説明を省略する。
The other structure is the same as that of the first embodiment described above, and the same reference numerals are omitted for the same parts.

【0034】上記の構造においては、ローラ13が突起
31の内側に入り込んだ時点で、傾斜面32、33及び
円筒面5とローラ13との間でクラッチが成立するが、
このクラッチの楔作用によってばね板8が外向きに変形
すると、ばね板8の内部には大きな曲げ応力が発生し、
はね板8からローラ13に対して大きな弾性反発力が生
じる。このため、ばね板8の曲げ応力は、ばね板に対す
るローラの接触角度がゼロに近づくに従って増大し、そ
れに比例して伝達トルクの大きさも増大する。したがっ
て、ばね板8が最大の曲げ応力を示す位置で最大の伝達
トルクを発生させることができ、大きなトルクを効率よ
く伝達することができる。
In the above structure, when the roller 13 enters the inside of the protrusion 31, the clutch is established between the inclined surface 32, 33 and the cylindrical surface 5 and the roller 13.
When the spring plate 8 is deformed outward by the wedge action of this clutch, a large bending stress is generated inside the spring plate 8,
A large elastic repulsive force is generated from the splash plate 8 to the roller 13. Therefore, the bending stress of the spring plate 8 increases as the contact angle of the roller with the spring plate approaches zero, and the magnitude of the transmission torque also increases in proportion thereto. Therefore, the maximum transmission torque can be generated at the position where the spring plate 8 exhibits the maximum bending stress, and a large torque can be efficiently transmitted.

【0035】図8は第3の実施例を示す。この例では、
外輪2の内径面に組込んだ8個のばね板8a〜8hを、
その各々のピッチ(ローラ13と係合する位置の間隔)
がそれぞれ異なるように配置し、その各ばね板8a〜8
hの内面に、内輪1の円筒面5に対してくさび形空間を
なす係合面9を形成している。
FIG. 8 shows a third embodiment. In this example,
Eight spring plates 8a-8h assembled on the inner diameter surface of the outer ring 2
The respective pitches (intervals of positions where the rollers 13 are engaged)
Are arranged so that they are different from each other, and each spring plate 8a-8
An engagement surface 9 forming a wedge-shaped space with respect to the cylindrical surface 5 of the inner ring 1 is formed on the inner surface of h.

【0036】また、保持器14の周面に、上記各ばね板
8a〜8hのピッチと同一のピッチで8個のポケット1
5を形成し、そのポケット15に係合子としてのローラ
13を組込んでいる。
Further, eight pockets 1 are formed on the peripheral surface of the cage 14 at the same pitch as that of the spring plates 8a to 8h.
5 is formed, and a roller 13 as an engaging element is incorporated in the pocket 15.

【0037】上記の構造においては、全てのばね板8a
〜8hにローラ13が当接した状態で、外輪2に負荷す
るトルクが大きくなると、ばね板8a〜8hが撓み、過
負荷が継続すると、ローラ13が各板ばねと円筒面の間
を通過する。このときの全てのばね板8a〜8hが同時
に撓んで作用するときの伝達トルクをリミッタトルクT
に設定する。
In the above structure, all spring plates 8a are
When the torque applied to the outer ring 2 increases with the roller 13 in contact with the roller 8 to 8h, the spring plates 8a to 8h bend, and when the overload continues, the roller 13 passes between the leaf springs and the cylindrical surface. . At this time, the transmission torque when all the spring plates 8a to 8h flex and act at the same time is defined as the limiter torque T.
Set to.

【0038】次に、保持器14がローラ13を次の係合
位置まで移動させるが、この際、先ず最初にばね板8d
にローラ13が再係合したとすると、この時の係合は、
ばね板8dだけが係合し、不等ピッチで配置される他の
ばね板8a〜8c、8e〜8hは係合しないため、伝達
トルクはリミッタトルクTよりも小さく、プロペラDは
回転しない。
Next, the cage 14 moves the roller 13 to the next engagement position. At this time, first of all, the spring plate 8d is moved.
If the roller 13 is re-engaged with, the engagement at this time is
Since only the spring plate 8d engages and the other spring plates 8a to 8c and 8e to 8h arranged at unequal pitches do not engage, the transmission torque is smaller than the limiter torque T and the propeller D does not rotate.

【0039】同じ様に、他の板ばね8a〜8c、8e〜
8hにも順次ローラ13が係合するが、その各場合も8
個の板ばねが同時に係合しないため、伝達トルクは小さ
く、プロペラDは回転しない。このため、設定トルクで
のローラ13の係合間隔は、第1及び第2実施例のよう
に板ばねを等ピッチに配置したものに比べて8倍にな
り、トルクリミッタが自動復帰する時間間隔が8倍に延
長される。
Similarly, the other leaf springs 8a-8c, 8e-
The roller 13 is sequentially engaged with 8h, but in each case, 8
Since the leaf springs are not engaged at the same time, the transmission torque is small and the propeller D does not rotate. Therefore, the engagement interval of the roller 13 at the set torque is eight times that in the case where the leaf springs are arranged at equal pitches as in the first and second embodiments, and the time interval at which the torque limiter automatically returns. Is extended eight times.

【0040】一方、図9及び図10は第4の実施例を示
す。この例では、クリープを生じる円環部同士の接触
を、転動体の圧入による変形を利用する代わりに、一方
の円環部を偏心させることにより行なっている。
On the other hand, FIGS. 9 and 10 show a fourth embodiment. In this example, the contact between the annular parts that cause creep is performed by eccentricizing one of the annular parts instead of utilizing the deformation caused by the press-fitting of the rolling elements.

【0041】すなわち、内輪1の外径面に、円筒面5に
対して偏心量εで偏心する偏心面41を形成し、その偏
心面41に軸受42を取付け、この軸受42の外径面に
Oリング43を介して保持器14の内径面を接触させて
いる。これにより、内輪1に対し保持器14に径方向の
力を付与して保持器14を偏心させており、その偏心に
よって保持器14に形成した円環部44を、外輪2に形
成した円環部45に線接触させている。
That is, an eccentric surface 41 which is eccentric to the cylindrical surface 5 by an eccentricity ε is formed on the outer diameter surface of the inner ring 1, and a bearing 42 is attached to the eccentric surface 41. The inner diameter surface of the cage 14 is in contact via the O-ring 43. As a result, a radial force is applied to the retainer 14 with respect to the inner ring 1 to cause the retainer 14 to be eccentric. It is in line contact with the portion 45.

【0042】上記の構造においては、保持器14は偏心
した両円環部44、45の接触転がりにより回転方向に
駆動されるが、円環部44、45同士が転がり運動をす
ると、両円環部44、45は1回転で偏心量εにπを乗
じた距離だけ円周方向に相対移動し、クリープを起こ
す。なお、上記の各実施例では、内輪1を駆動側に外輪
2を従動側にしたが、逆に外輪2を駆動側にして内輪1
を従動側にしても、上述と同じ作用を得ることができ
る。
In the above structure, the cage 14 is driven in the rotational direction by the contact rolling of the eccentric ring portions 44 and 45, but when the ring portions 44 and 45 make a rolling motion, both ring portions are rotated. The portions 44 and 45 relatively move in the circumferential direction by a distance obtained by multiplying the amount of eccentricity ε by π in one rotation, and creep occurs. In each of the above embodiments, the inner ring 1 is the driving side and the outer ring 2 is the driven side, but conversely, the outer ring 2 is the driving side.
Even if is set to the driven side, the same effect as described above can be obtained.

【0043】[0043]

【効果】以上のように、この発明の安全装置において
は、プロペラ推進軸とプロペラの間に自動復帰機能付き
のトルクリミッタを設け、プロペラから推進軸に向かう
過大な負荷をトルクリミッタで遮断する一方、トルク伝
達状態への復帰を自動的に行なうようにしたので、シャ
ーピンの交換などの復旧作業を不要にでき、安全で効率
のよい船舶の航行を行なうことができる。
As described above, in the safety device of the present invention, the torque limiter with an automatic return function is provided between the propeller propulsion shaft and the propeller, and an excessive load from the propeller to the propulsion shaft is blocked by the torque limiter. Since the return to the torque transmission state is automatically performed, it is possible to eliminate the need for recovery work such as replacement of the shear pin, and to perform safe and efficient navigation of the ship.

【0044】また、この発明の第2乃至第4の手段によ
れば、クリープ現象によりトルクリミッタによるトルク
伝達の遮断から再連結までの時間間隔を著しく長くでき
るので、異常状態からの回復や機械停止のための十分な
時間的余裕を船外機に与えることができる。
Further, according to the second to fourth means of the present invention, the time interval from the interruption of the torque transmission by the torque limiter to the reconnection can be remarkably lengthened due to the creep phenomenon, so that recovery from an abnormal state or machine stoppage can be achieved. Can provide the outboard motor with sufficient time for.

【図面の簡単な説明】[Brief description of drawings]

【図1】実施例の船外機の安全装置を示す断面図FIG. 1 is a sectional view showing a safety device for an outboard motor according to an embodiment.

【図2】同上のトルクリミッタを拡大して示す断面図FIG. 2 is an enlarged sectional view showing the torque limiter of the above.

【図3】図2のIII −III 線に沿った断面図FIG. 3 is a sectional view taken along line III-III in FIG.

【図4】図2のIV−IV線に沿った断面図FIG. 4 is a sectional view taken along line IV-IV in FIG.

【図5】同上のクリープ発生部分を拡大して示す断面図FIG. 5 is an enlarged cross-sectional view showing a creep occurrence portion of the above.

【図6】同上のクラッチ部分を示す断面図FIG. 6 is a sectional view showing a clutch portion of the above.

【図7】第2の実施例を示す断面図FIG. 7 is a sectional view showing a second embodiment.

【図8】第3の実施例を示す断面図FIG. 8 is a sectional view showing a third embodiment.

【図9】第4の実施例を示す断面図FIG. 9 is a sectional view showing a fourth embodiment.

【図10】図9のX−X線に沿った断面図10 is a sectional view taken along line XX of FIG.

【図11】従来例を示す断面図FIG. 11 is a sectional view showing a conventional example.

【符号の説明】[Explanation of symbols]

C、C’ プロペラ推進軸 D プロペラ E プロペラハウジング F トルクリミッタ 1 内輪 2 外輪 5 円筒面 7 板ばね 8 ばね板 9 係合面 10 凹所 13 ローラ 14 保持器 16 クリープ外輪 17、19 円環部 22 円筒ころ 31 突起 41 偏心面 44、45 円環部 C, C'Propeller propeller shaft D Propeller E Propeller housing F Torque limiter 1 Inner ring 2 Outer ring 5 Cylindrical surface 7 Leaf spring 8 Spring plate 9 Engaging surface 10 Recess 13 Roller 14 Cage 16 Creep outer ring 17, 19 Ring part 22 Cylindrical roller 31 Protrusion 41 Eccentric surface 44, 45 Annular part

Claims (4)

【特許請求の範囲】[Claims] 【請求項1】 プロペラ推進軸にプロペラを相対回転可
能に取付け、そのプロペラ推進軸とプロペラの間に、自
動復帰機能を備えるトルクリミッタを組込んだ船外機の
安全装置。
1. An outboard motor safety device in which a propeller is attached to a propeller propulsion shaft so as to be relatively rotatable, and a torque limiter having an automatic return function is incorporated between the propeller propulsion shaft and the propeller.
【請求項2】 上記トルクリミッタが、プロペラ推進軸
に連結する軌道輪とプロペラに連結する軌道輪との間に
係合子を保持する保持器を設け、上記両軌道輪の対向す
る面の一方に円筒面を、他方に上記円筒面との間で係合
子を係合させる係合面を設け、上記係合面を弾性変形可
能に形成すると共に、上記保持器に、プロペラ推進軸の
回転を減速して伝える減速手段を連結して構成されてい
る請求項1に記載の船外機の安全装置。
2. The torque limiter is provided with a retainer for holding an engaging member between a bearing ring connected to the propeller propulsion shaft and a bearing ring connected to the propeller, and one of the facing surfaces of the both bearing rings is provided. The cylindrical surface is provided on the other side with an engaging surface for engaging the engaging element with the cylindrical surface, and the engaging surface is elastically deformable, and at the same time, the rotation of the propeller propulsion shaft is reduced in the retainer. The outboard motor safety device according to claim 1, which is configured by connecting deceleration means for transmission.
【請求項3】 上記減速手段を、プロペラに連結する軌
道輪と保持器とにそれぞれ共回りするように関連させて
設けられ、互にすき間をもって内外に嵌合する円環部
と、上記保持器とプロペラ推進軸に連結する軌道輪との
間に圧入され、上記保持器に関連した円環部を変形させ
て両円環部を接触させる転動体と、から構成した請求項
2に記載の船外機の安全装置。
3. A retainer and an annular portion which are provided so as to be associated with a bearing ring connected to a propeller and a retainer so as to co-rotate with each other, and which fit inside and outside with a clearance therebetween. The ship according to claim 2, further comprising: a rolling element that is press-fitted between a ring and a bearing ring connected to the propeller propulsion shaft to deform an annular portion associated with the retainer to bring the annular portions into contact with each other. Safety device for outside machine.
【請求項4】 上記係合面に、係合子が円周方向に嵌ま
り込む凹所を設け、その凹所の両側に上記係合子の係合
部を形成した請求項2又は3に記載の船外機の安全装
置。
4. The recess according to claim 2, wherein the engaging surface is provided with a recess into which the engaging member is fitted in the circumferential direction, and the engaging portions of the engaging member are formed on both sides of the recess. Safety equipment for outboard motors.
JP4242190A 1992-09-10 1992-09-10 Safety device of outboard motor Pending JPH0694052A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4242190A JPH0694052A (en) 1992-09-10 1992-09-10 Safety device of outboard motor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4242190A JPH0694052A (en) 1992-09-10 1992-09-10 Safety device of outboard motor

Publications (1)

Publication Number Publication Date
JPH0694052A true JPH0694052A (en) 1994-04-05

Family

ID=17085641

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4242190A Pending JPH0694052A (en) 1992-09-10 1992-09-10 Safety device of outboard motor

Country Status (1)

Country Link
JP (1) JPH0694052A (en)

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