JPS639768Y2 - - Google Patents

Info

Publication number
JPS639768Y2
JPS639768Y2 JP6910080U JP6910080U JPS639768Y2 JP S639768 Y2 JPS639768 Y2 JP S639768Y2 JP 6910080 U JP6910080 U JP 6910080U JP 6910080 U JP6910080 U JP 6910080U JP S639768 Y2 JPS639768 Y2 JP S639768Y2
Authority
JP
Japan
Prior art keywords
shaft
diameter
hole
shear pin
cylinder
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
Application number
JP6910080U
Other languages
Japanese (ja)
Other versions
JPS56170314U (en
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 filed Critical
Priority to JP6910080U priority Critical patent/JPS639768Y2/ja
Publication of JPS56170314U publication Critical patent/JPS56170314U/ja
Application granted granted Critical
Publication of JPS639768Y2 publication Critical patent/JPS639768Y2/ja
Expired legal-status Critical Current

Links

Landscapes

  • Snaps, Bayonet Connections, Set Pins, And Snap Rings (AREA)

Description

【考案の詳細な説明】[Detailed explanation of the idea]

本考案は、軸とそれに緩着される筒体とを、設
定値以上の負荷が掛かつたときに剪断するシヤー
ピンでもつて結合連結する過負荷防止伝動手段の
改良構造に関するものである。 上記伝動手段の従来技術としては、第5図に示
しているものや、実公昭48−45543号公報にみら
れるものが存在しているが、いずれの従来技術
も、軸と筒体とにわたつて貫通開設される挿通孔
は全体を同一径にして開設し、また、それに貫挿
されるシヤーピンも全体が挿通孔と略同径になる
ように形成して、シヤーピンと挿通孔とがキツチ
リと嵌まり合う構造になつている。故に、従来構
造のものでは、軸と筒体とに貫通開設される挿通
孔の孔径、ならびにシヤーピンの径を変えない限
り限界トルクを変更設定することができないの
で、限界トルクを変える場合には装置全体にわた
る大掛かりな変更所作が必要になる難点があり、
適用範囲が限られる難点があつた。 本考案は、上記難点の解消を目的として実施し
たもので、限界トルクを種々に変更設定すること
が簡単で、適用範囲を広げて活用することができ
るように改良した過負荷防止伝動手段の安全ピン
構造を提供するものである。 すなわち、本考案は、軸1に筒体2を緩着し両
者1,2を直径方向に貫通するシヤーピン4で結
合する過負荷防止伝動手段において、前記シヤー
ピン4を貫挿する挿通孔3を、筒体2部分の孔径
が軸1部分の孔径と同径かそれよりも大になり、
且つ、筒体2部分における軸径方向両側の孔径間
には大小差ができるようにして開設した安全ピン
構造にしているものである。 つぎに、本考案の具体例を図面により説明す
る。 本考案は、軸1と、該軸に緩着される筒体(ギ
ヤ、スプロケツトなどのボス部2)とを直径方向
に横断して開設される挿通孔3と、同挿通孔3に
貫通されるシヤーピン4が緊挿されるものでない
ことが特徴である。 つまり、シヤーピン4の外径よりもやや大きな
孔径に開設する挿通孔3を、筒体2に開設する部
分の孔径が、軸1に開設する部分の孔径と同径か
それよりも大になり、且つ、筒体2部分において
軸1の直径方向両側の孔径間には大小差ができる
ようにして開設して、筒体2における軸両側の孔
径差を大小調整することによつて種々の限界トル
ク値を得るようにしているのである。 筒体2部分に開設される軸径方向両側の孔径が
軸1部分に開設される孔径より大で、しかも筒体
部分の軸径方向両側の孔径間には差が存するの
で、シヤーピン4との間には、軸径方向両側で径
差のある隙間が現出することになり、過負荷がか
かつたときには、軸1または筒体2が躍つて一種
の衝撃力が発生し、その衝撃力による負荷がシヤ
ーピン4にかかる。そして、筒体2における軸径
方向両側の隙間の大小差と、シヤーピン4に付与
される衝撃力との間には相関々係があつて、衝撃
力の大小が、前記隙間差の大小によつて定まるの
であり、このことは、実験によつて次のように確
認できている。
The present invention relates to an improved structure of an overload prevention transmission means in which a shaft and a cylindrical body loosely attached to the shaft are connected by a shear pin that shears when a load exceeding a set value is applied. Conventional technologies for the above-mentioned transmission means include the one shown in Fig. 5 and the one found in Publication of Utility Model Publication No. 48-45543, but all of these conventional technologies have The insertion hole that is opened through the insertion hole is made to have the same diameter as a whole, and the shear pin that is inserted through it is also formed so that the entire diameter is approximately the same as that of the insertion hole, so that the shear pin and the insertion hole are tightly fitted. It has a structure that fits together. Therefore, with the conventional structure, the limit torque cannot be changed unless the diameter of the insertion hole made through the shaft and the cylinder and the diameter of the shear pin are changed. There is a drawback in that it requires major changes throughout the process.
The problem was that the scope of application was limited. The present invention was implemented with the aim of resolving the above-mentioned difficulties.It is easy to change and set the limit torque in various ways, and the safety of the overload prevention transmission means has been improved so that it can be used in a wide range of applications. It provides a pin structure. That is, the present invention provides an overload prevention transmission means in which a cylindrical body 2 is loosely attached to a shaft 1 and connected by a shear pin 4 passing through both 1 and 2 in the diametrical direction. The hole diameter in the second part of the cylinder is the same as or larger than the hole diameter in the first part of the shaft,
Moreover, the safety pin structure is such that there is a difference in size between the hole diameters on both sides in the axial and radial direction in the cylindrical body 2 portion. Next, a specific example of the present invention will be explained with reference to the drawings. The present invention includes an insertion hole 3 that is opened diametrically across a shaft 1 and a cylindrical body (boss portion 2 of a gear, sprocket, etc.) that is loosely attached to the shaft; A feature is that the shear pin 4 is not tightly inserted. In other words, the insertion hole 3 is formed to have a diameter slightly larger than the outer diameter of the shear pin 4, and the hole diameter of the portion formed in the cylinder body 2 is the same or larger than the hole diameter of the portion formed in the shaft 1. In addition, the diameter of the hole on both sides of the shaft 1 in the cylinder body 2 is made to have a size difference, and by adjusting the difference in the diameter of the hole on both sides of the shaft in the cylinder body 2, various limit torques can be adjusted. We are trying to get a value. The diameters of the holes on both sides in the radial direction of the cylinder body are larger than the diameters of the holes formed in the shaft 1 part, and there is a difference between the diameters of the holes on both sides of the cylinder body in the radial direction. In between, a gap with a diameter difference appears on both sides in the radial direction of the shaft, and when an overload is applied, the shaft 1 or the cylinder body 2 jumps and a kind of impact force is generated, and that impact force load is applied to the shear pin 4. There is a correlation between the size difference in the gap on both sides in the axial and radial direction of the cylinder body 2 and the impact force applied to the shear pin 4, and the size of the impact force depends on the size of the gap difference. This has been confirmed through experiments as follows.

【表】 これから判明するように、軸側に開設される挿
通孔の軸径方向両側の孔径差が大きほど衝撃力が
増して剪断トルクが小さくなるので、前記孔径差
の調整により、過負荷防止伝動手段の限界トルク
を所望の値に自在に設定できるのである。 なお、筒体2側に開設する挿通孔は、丸孔に限
られるものではなく、場合によつては第4図に図
示しているように回転方向前後に長い長孔に形成
することもできるのである。 要するに、本考案は、軸1に筒体2を緩着し両
者1,2を直径方向に貫通するシヤーピン4で結
合する過負荷防止伝動手段において、前記シヤー
ピン4を貫挿する挿通孔3を、筒体2部分の孔径
が軸1部分の孔径と同径かそれよりも大になり、
且つ、筒体2における軸径方向両側の孔径間には
大小差ができるようにして開設した安全ピン構造
にしているから、上記の実験結果からも明らかに
なるように、筒体2側の孔径差を種々に設定する
だけで限界トルク値を任意に変更設定することが
でき、コストダウンを図りながら適用範囲を広げ
て便利に用いることができる。 しかも、挿通孔2が、軸1の部分と筒体2の部
分とで孔径差のあるものとなることにより、シヤ
ーピン4に負荷される衝撃力は、軸1と筒体2と
の嵌合面部で最大となつてシヤーピン4に直に掛
かるから、設定限界トルクでのシヤーピン破断に
バラツキがなくなり適期に正確に伝動が遮断され
る。といつた利点がある。
[Table] As will be clear from this, the larger the difference in diameter between the two sides of the insertion hole on the shaft side, the greater the impact force and the smaller the shearing torque. By adjusting the difference in hole diameter, overload can be prevented. The limit torque of the transmission means can be freely set to a desired value. In addition, the insertion hole opened on the side of the cylinder 2 is not limited to a round hole, and in some cases, it may be formed into a long hole that is long in the direction of rotation as shown in FIG. 4. It is. In short, the present invention provides an overload prevention transmission means in which a cylindrical body 2 is loosely attached to a shaft 1 and connected by a shear pin 4 passing through both 1 and 2 in the diametrical direction. The hole diameter in the second part of the cylinder is the same as or larger than the hole diameter in the first part of the shaft,
In addition, since the safety pin structure is made such that there is a size difference between the hole diameters on both sides in the axial and radial direction of the cylinder body 2, as is clear from the above experimental results, the hole diameter on the cylinder body 2 side The limit torque value can be arbitrarily changed and set simply by setting various differences, and the range of application can be expanded and used conveniently while reducing costs. Furthermore, since the insertion hole 2 has a diameter difference between the shaft 1 and the cylinder 2, the impact force applied to the shear pin 4 is transmitted to the fitting surface between the shaft 1 and the cylinder 2. Since the maximum torque is applied directly to the shear pin 4, there is no variation in shear pin breakage at the set limit torque, and the transmission is accurately interrupted at the appropriate time. There are some advantages.

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

第1図は本考案の要部構造を示す断面図、第2
図は筒体側の挿通孔の孔径を変えた場合を示す第
1図と同様の断面図、第3図は第1図のA−A断
面矢視図、第4図は変形例説明図、第5図は従来
構造説明図である。 1……軸、2……筒体、3……挿通孔、4……
シヤーピン。
Figure 1 is a sectional view showing the main structure of the present invention;
The figure is a cross-sectional view similar to Figure 1 showing the case where the hole diameter of the insertion hole on the cylinder side is changed, Figure 3 is a cross-sectional view taken along the line A-A in Figure 1, Figure 4 is an explanatory diagram of a modification, and Figure 4 is a diagram for explaining a modification. FIG. 5 is an explanatory diagram of a conventional structure. 1...Shaft, 2...Cylinder, 3...Insertion hole, 4...
shear pin.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 軸1に筒体2を外嵌緩着し両者1,2を直径方
向に貫通するシヤーピン4で結合する過負荷防止
伝動手段において、前記シヤーピン4を貫挿する
挿通孔3を、筒体2部分の孔径が軸1部分の孔径
と同径かそれよりも大になり、且つ、筒体2部分
における軸径方向両側の孔径間には大小差ができ
るようにして開設してあることを特徴とする軸類
に挿設される安全ピン構造。
In an overload prevention transmission means in which a cylindrical body 2 is loosely fitted onto a shaft 1 and connected by a shear pin 4 passing through both 1 and 2 in the diametrical direction, an insertion hole 3 through which the shear pin 4 is inserted is formed in a portion of the cylindrical body 2. The diameter of the hole is the same as or larger than the diameter of the hole in the first part of the shaft, and the diameter of the hole on both sides in the radial direction of the shaft in the second part of the cylinder is opened so as to be different in size. Safety pin structure inserted into shafts.
JP6910080U 1980-05-19 1980-05-19 Expired JPS639768Y2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6910080U JPS639768Y2 (en) 1980-05-19 1980-05-19

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6910080U JPS639768Y2 (en) 1980-05-19 1980-05-19

Publications (2)

Publication Number Publication Date
JPS56170314U JPS56170314U (en) 1981-12-16
JPS639768Y2 true JPS639768Y2 (en) 1988-03-23

Family

ID=29663013

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6910080U Expired JPS639768Y2 (en) 1980-05-19 1980-05-19

Country Status (1)

Country Link
JP (1) JPS639768Y2 (en)

Also Published As

Publication number Publication date
JPS56170314U (en) 1981-12-16

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