JP2007051684A - Planetary roller screw device - Google Patents

Planetary roller screw device Download PDF

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JP2007051684A
JP2007051684A JP2005237293A JP2005237293A JP2007051684A JP 2007051684 A JP2007051684 A JP 2007051684A JP 2005237293 A JP2005237293 A JP 2005237293A JP 2005237293 A JP2005237293 A JP 2005237293A JP 2007051684 A JP2007051684 A JP 2007051684A
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screw
shaft
nut
roller
planetary roller
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Yasuyuki Matsuda
靖之 松田
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NSK Ltd
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NSK Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a planetary roller screw device capable of generating high thrust though it is compact, and having small lead of a shaft screw. <P>SOLUTION: This planetary roller screw device comprises the screw shaft having a shaft screw on its outer peripheral face, a nut having a nut screw of the twisting direction opposite to that of the screw shaft, on its inner peripheral face, and a planetary roller fitted to the shaft screw and the nut screw, and having a roller screw of the twisting direction same as that of the nut screw, on its outer peripheral face. In a case when a ratio do/di of an engagement pitch circle diameter (do) of the nut screw and the roller screw, to an engagement pitch circle diameter (di) of the shaft screw and the roller screw, is 2.0, a quadruple threaded nut screw, a single threaded roller screw and a single threaded shaft screw are applied. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、電動キャリパブレーキの駆動用アクチュエータ等に用いられる小型で大きな軸方向の推力を発生させる遊星ローラねじ装置に関する。   The present invention relates to a planetary roller screw device for generating a small and large axial thrust used for an actuator for driving an electric caliper brake or the like.

従来の遊星ローラねじ装置は、外周面に軸ねじを形成したねじ軸と、内周面にねじ軸と反対方向の捩れ方向でナットねじを形成したナットと、軸ねじとナットねじとに嵌合すると共にナットねじと同一方向の捩れ方向のローラねじを外周面に形成した遊星ローラとにより遊星ローラねじ装置を構成し、軸ねじとローラねじとの噛合ピッチ円直径diに対する前記ナットねじとローラねじとの噛合ピッチ円直径doの比do/di=2.0としたときに、ナットねじを4条、ローラねじを1条、軸ねじを3条とし、またdo/di=3.0としたときに、ナットねじを3条、ローラねじを1条、軸ねじを2条としてナット1回転当りのねじ軸の進み量をねじの1ピッチ未満として回転運動を直線運動に変換している(例えば、特許文献1参照。)。
特開平10−196757号公報(主に第4頁段落0014−第4頁段落0017、第2図)
The conventional planetary roller screw device is fitted with a screw shaft having a shaft screw formed on the outer peripheral surface, a nut having a nut screw formed on the inner peripheral surface in a twist direction opposite to the screw shaft, and the shaft screw and the nut screw. And a planetary roller screw device comprising a planetary roller having a torsion roller roller formed in the same direction as the nut screw on the outer peripheral surface, and the nut screw and the roller screw with respect to the meshing pitch circle diameter di of the shaft screw and the roller screw. When the ratio do / di = 2.0 of the meshing pitch circle diameter do, the nut screw has four threads, the roller screw has one thread, the shaft screw has three threads, and do / di = 3.0. In some cases, three nut screws, one roller screw and two shaft screws are used, and the amount of advance of the screw shaft per rotation of the nut is less than one pitch of the screw to convert the rotational motion into a linear motion (for example, See Patent Document 1. .
JP-A-10-196757 (mainly page 4 paragraph 0014-page 4 paragraph 0017, FIG. 2)

しかしながら、上述した従来の技術においては、軸ねじとローラねじの捩れ方向を反対方向とし、軸ねじを多条としているため、軸ねじのリードが大きくなって軸ねじとローラねじの滑りが大きくなり、摩擦損失が増大するという問題がある。
本発明は、上記の問題点を解決するためになされたもので、小型で大きな推力を発生させることができる軸ねじのリードが小さい遊星ローラねじ装置を提供することを目的とする。
However, in the above-described conventional technology, the twist direction of the shaft screw and the roller screw is opposite, and the shaft screw has multiple threads. Therefore, the lead of the shaft screw becomes large and the slip of the shaft screw and the roller screw becomes large. There is a problem that friction loss increases.
The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a planetary roller screw device that is small and has a small shaft screw lead that can generate a large thrust.

本発明は、上記課題を解決するために、外周面に軸ねじを形成したねじ軸と、内周面に前記ねじ軸と反対方向の捩れ方向でナットねじを形成したナットと、前記軸ねじとナットねじとに嵌合すると共に前記ナットねじと同一方向の捩れ方向のローラねじを外周面に形成した遊星ローラとを備え、前記軸ねじとローラねじとの噛合ピッチ円直径diに対する前記ナットねじとローラねじとの噛合ピッチ円直径doの比do/diを2.0とした遊星ローラねじ装置において、前記ナットねじを4条とし、前記ローラねじを1条とし、前記軸ねじを1条としたことを特徴とする。   In order to solve the above-described problems, the present invention provides a screw shaft in which a shaft screw is formed on the outer peripheral surface, a nut in which a nut screw is formed on the inner peripheral surface in a twist direction opposite to the screw shaft, and the shaft screw. A planetary roller that is fitted to a nut screw and has a roller screw formed on the outer peripheral surface thereof in the same direction as the nut screw, and the nut screw with respect to the meshing pitch circle diameter di of the shaft screw and the roller screw; In the planetary roller screw device in which the ratio do / di of the meshing pitch circle diameter do with the roller screw is 2.0, the nut screw has four threads, the roller screw has one thread, and the shaft screw has one thread. It is characterized by that.

これにより、本発明は、ねじ軸の進み量を軸ねじの1ピッチ未満のとすることができ、回転トルクの小さいモータを使用しても大きな軸方向の推力を得ることができるという効果が得られる。
また、1条のねじ軸によって大きな推力を発生させることができるリードの小さい遊星ローラねじ装置を得ることができ、軸ねじとローラねじの滑りを防止して摩擦損失を低減することができると共に、これを電動キャリパブレーキの駆動用アクチュエータとして用いた場合には、回転トルクの大きな動力源または減速比の大きな減速機が不要となり、電動キャリパブレーキの駆動用アクチュエータの小型化を図ることができるという効果が得られる。
As a result, the present invention has an effect that the advance amount of the screw shaft can be less than one pitch of the shaft screw, and a large axial thrust can be obtained even when a motor having a small rotational torque is used. It is done.
In addition, a planetary roller screw device with a small lead that can generate a large thrust with a single screw shaft can be obtained, and the friction loss can be reduced by preventing the shaft screw and the roller screw from slipping. When this is used as an actuator for driving an electric caliper brake, a power source having a large rotational torque or a reducer having a large reduction ratio is not required, and the electric caliper brake driving actuator can be reduced in size. Is obtained.

以下に、図面を参照して本発明による遊星ローラねじ装置の実施例について説明する。   Embodiments of a planetary roller screw device according to the present invention will be described below with reference to the drawings.

図1は実施例1の遊星ローラねじ装置を示す側方断面図である。
図1において、1は遊星ローラねじ装置である。
2は遊星ローラねじ装置1のねじ軸であり、合金鋼等の鋼材、例えばSUS440Cで製作された棒状部材であって、その外周面には略台形断面形状のねじ山を有する右捩れの1条の軸ねじ3が所定のピッチPで形成されている。本実施例の軸ねじは1条であるので前記のピッチPはリードと一致する。
FIG. 1 is a side sectional view showing a planetary roller screw device according to a first embodiment.
In FIG. 1, reference numeral 1 denotes a planetary roller screw device.
Reference numeral 2 denotes a screw shaft of the planetary roller screw device 1, which is a rod-shaped member made of steel such as alloy steel, for example, SUS440C, and has a right-handed thread having a substantially trapezoidal cross-sectional shape on its outer peripheral surface. The shaft screws 3 are formed at a predetermined pitch P. Since the shaft screw of this embodiment is a single thread, the pitch P matches the lead.

4は遊星ローラねじ装置1のナットであり、合金鋼の鋼材、例えばSUS440Cで製作された円筒状部材であって、その内周面にはねじ軸2と同様の形状のねじ山で軸ねじ3と反対方向の捩れ方向、つまり左捩れを有する4条のナットねじ5が軸ねじ3と同じピッチPで形成されている。
また、ナット4の外周部にはフランジ4aが設けられており、ナット4を回転させるための駆動機構等が取付けられる。
Reference numeral 4 denotes a nut of the planetary roller screw device 1, which is a cylindrical member made of alloy steel, for example, SUS440C, and has a screw thread having the same shape as the screw shaft 2 on its inner peripheral surface. The four nut screws 5 having the twist direction opposite to the direction, that is, the left twist, are formed at the same pitch P as the shaft screw 3.
Further, a flange 4 a is provided on the outer peripheral portion of the nut 4, and a drive mechanism or the like for rotating the nut 4 is attached.

6は遊星ローラであり、合金鋼等の鋼材、例えばSUS440Cで製作された棒状部材であって、両端部に円柱状の軸部7が形成されており、一方の軸部7の内側に隣接して遊星ローラ6と同軸に遊星ピニオンギヤ8が設けられており、この遊星ピニオンギヤ8と他方の軸部7との間の外周面には軸ねじ3とナットねじ5とに嵌合するねじ軸2と同様の形状のねじ山でナットねじ5と同一方向の捩れ方向、つまり左捩れを有する1条のローラねじ9が軸ねじ3と同じピッチPで形成されている。   Reference numeral 6 denotes a planetary roller, which is a rod-shaped member made of a steel material such as alloy steel, for example, SUS440C, and is formed with cylindrical shaft portions 7 at both ends, and is adjacent to one shaft portion 7. A planetary pinion gear 8 is provided coaxially with the planetary roller 6, and on the outer peripheral surface between the planetary pinion gear 8 and the other shaft portion 7, a screw shaft 2 fitted to the shaft screw 3 and the nut screw 5 is provided. A single roller screw 9 having the same shape of thread and having the same twisting direction as the nut screw 5, that is, a left twist, is formed at the same pitch P as that of the shaft screw 3.

10は保持器であり、樹脂材料や金属材料、例えば黄銅(HBsC1等)で製作された円環状部材であって、遊星ローラ6の軸部7が嵌合する嵌合孔が所定の角度ピッチで複数設けられており、遊星ローラ6の軸部7を嵌合孔で保持してねじ軸2とナット4の間に複数の遊星ローラ6を所定の角度ピッチで配置する。本実施例では8本の遊星ローラ6がナット4とねじ軸2の間に等角度ピッチで配置されている。   Reference numeral 10 denotes a cage, which is an annular member made of a resin material or a metal material such as brass (HBsC1 or the like), and the fitting holes into which the shaft portion 7 of the planetary roller 6 is fitted have a predetermined angular pitch. A plurality of planetary rollers 6 are provided with a shaft portion 7 of the planetary roller 6 held by a fitting hole, and the plurality of planetary rollers 6 are arranged at a predetermined angular pitch between the screw shaft 2 and the nut 4. In this embodiment, eight planetary rollers 6 are arranged at an equiangular pitch between the nut 4 and the screw shaft 2.

11はリングギヤであり、保持器10に保持された切削により成形された小径の平歯車である遊星ピニオンギヤ8に噛合う内歯の平歯車であって、ナット4の内側に嵌合するリングギヤ押え12によりその軸方向の移動が制限され、遊星ピニオンギヤ8がリングギヤ11に噛合うことにより遊星ローラ6を一定の速度で公転させる。
リングギヤ11と遊星ピニオンギヤ8とのギヤ比は、ナット4のナットねじ5の噛合ピッチ円直径doと遊星ローラ6のローラねじ9の噛合ピッチ円直径dpとの比と同一となるように設定される。
Reference numeral 11 denotes a ring gear, which is an internal spur gear that meshes with the planetary pinion gear 8 that is a small-diameter spur gear that is formed by cutting and held by the cage 10, and is a ring gear presser 12 that fits inside the nut 4. Thus, the movement in the axial direction is restricted, and the planetary pinion gear 8 meshes with the ring gear 11 to cause the planetary roller 6 to revolve at a constant speed.
The gear ratio between the ring gear 11 and the planetary pinion gear 8 is set to be the same as the ratio between the meshing pitch circle diameter do of the nut screw 5 of the nut 4 and the meshing pitch circle diameter dp of the roller screw 9 of the planetary roller 6. .

また、遊星ピニオンギヤ8の歯の先端には、軸ねじ3との干渉を防止するための円周方向の逃げ溝が設けられており、リングギヤ11の歯にもこの逃げ溝に遊嵌する溝が設けられている。
上記のねじ軸2の軸ねじ3とナット4のナットねじ5とに保持器10に保持され、リングギヤ11と遊星ピニオンギヤ8により公転を案内された遊星ローラ6のローラねじ9が嵌合し、ナット4を回転させることによって遊星ローラ6がねじ軸2の周りを自転しながら公転してねじ軸2を軸方向に移動させる。これによりナット4の回転運動がねじ軸2の直線運動に変換される。
Further, a circumferential clearance groove for preventing interference with the shaft screw 3 is provided at the tooth tip of the planetary pinion gear 8, and the groove of the ring gear 11 also has a groove that fits loosely into the clearance groove. Is provided.
The roller screw 9 of the planetary roller 6 held by the cage 10 and guided to revolve by the ring gear 11 and the planetary pinion gear 8 is fitted to the shaft screw 3 of the screw shaft 2 and the nut screw 5 of the nut 4. By rotating 4, the planetary roller 6 revolves while rotating around the screw shaft 2 to move the screw shaft 2 in the axial direction. Thereby, the rotational motion of the nut 4 is converted into the linear motion of the screw shaft 2.

上記のような構成において、本実施例のねじ軸2の右捩れの1条の軸ねじ3の山径は21.13mm、谷径は18.71mm(ねじ山高さ1.21mm)、遊星ローラ6のローラねじ9との噛合ピッチ円直径diは20.125mm、ねじのピッチPは1.44mm、圧力角25度であり、台形状のねじ山の先端にはR面取が施されており、これらの成形は切削により加工される。   In the configuration as described above, the thread diameter of the right-twisted shaft screw 3 of the screw shaft 2 of this embodiment is 21.13 mm, the valley diameter is 18.71 mm (thread height 1.21 mm), and the planetary roller 6. The meshing pitch circle diameter di with the roller screw 9 is 20.125 mm, the screw pitch P is 1.44 mm, the pressure angle is 25 degrees, and the tip of the trapezoidal screw thread has an R chamfer, These moldings are processed by cutting.

ナット4の全長は50mm、左捩れの4条のナットねじ5のと遊星ローラ6のローラねじ9との噛合ピッチ円直径doは40.249mmであり、これらの成形は切削により加工される。
8本の遊星ローラ6の左捩れの1条のローラねじ9の噛合ピッチ円直径dpは10.062mm、有効噛合長さは32.5mmであり、ローラねじ9は転造により加工され、隣合う遊星ローラ6のローラねじ9の山径は少なくとも0.5mmの隙間を介して配置されている。
The total length of the nut 4 is 50 mm, and the meshing pitch circle diameter do of the four left-twisted nut screws 5 and the roller screw 9 of the planetary roller 6 is 40.249 mm, and these moldings are processed by cutting.
The meshing pitch circle diameter dp of the left-twisted one roller screw 9 of the eight planetary rollers 6 is 10.062 mm, the effective meshing length is 32.5 mm, and the roller screws 9 are processed by rolling and are adjacent to each other. The crest diameter of the roller screw 9 of the planetary roller 6 is arranged with a gap of at least 0.5 mm.

また、ローラねじ9のねじ山の先端のランド幅は、軸ねじ3とローラねじ9の噛合点での捩れ角の相違による干渉を緩和するために軸ねじ3やナットねじ5のランド幅よりも僅かに小さく形成されておる。またローラねじ9の有効噛合長さの両端は、軸ねじ3やナットねじ5との噛合始めの衝撃を緩和するためにクラウニングが施されている。
なお、各ねじのピッチPは上記したように同一であり、P=1.44mmである。
Further, the land width at the tip of the thread of the roller screw 9 is larger than the land width of the shaft screw 3 or the nut screw 5 in order to reduce interference due to the difference in the twist angle at the meshing point of the shaft screw 3 and the roller screw 9. It is formed slightly smaller. Further, both ends of the effective meshing length of the roller screw 9 are crowned in order to mitigate the impact at the beginning of meshing with the shaft screw 3 and the nut screw 5.
Note that the pitch P of each screw is the same as described above, and P = 1.44 mm.

上記のナット4の外径Dは
(D−do)=πdi/4 ・・・・・・・・・・・・・・・(1)
なる条件、つまりナット4とねじ軸2の断面積が等しくなる条件を満たすように形成され、本実施例では式(1)を満たすための外径Dは45mmとなり、研削により成形される。式(1)の条件を満たすことにより、遊星ローラねじ装置1に軸方向荷重が作用した際に、ナット4およびねじ軸2で発生する弾性変形による伸縮量を同程度とすることができ、荷重作用側と反荷重作用側とで荷重の支持割合の分布が均一となるので、遊星ローラねじ装置1の耐久性を向上させることができる。
The outer diameter D of the nut 4 (D 2 -do 2) = πdi 2/4 ··············· (1)
In other words, the outer diameter D for satisfying the formula (1) is 45 mm and is formed by grinding. By satisfying the condition of the expression (1), when an axial load is applied to the planetary roller screw device 1, the amount of expansion and contraction caused by elastic deformation generated in the nut 4 and the screw shaft 2 can be made the same level. Since the distribution of the load support ratio is uniform between the working side and the anti-loading side, the durability of the planetary roller screw device 1 can be improved.

遊星ローラねじ装置1のねじ軸2とナット4とが相対回転をする場合に、ナット4と遊星ローラ6とが互いに軸方向に変位して遊星ローラ6がナット4から抜け落ちないためには、ナットねじ5の条数をmo、遊星ローラの条数をmpとすると、軸ねじ3とローラねじ9との噛合ピッチ円直径diに対するナットねじ5とローラねじ9との噛合ピッチ円直径doの比do/diが
do/di=mo/(mo−2mp) ・・・・・・・・・・・・(2)
である必要がある。
When the screw shaft 2 and the nut 4 of the planetary roller screw device 1 rotate relative to each other, the nut 4 and the planetary roller 6 are axially displaced from each other so that the planetary roller 6 does not fall out of the nut 4. The ratio do of the meshing pitch circle diameter do of the nut screw 5 and the roller screw 9 with respect to the meshing pitch circle diameter di of the shaft screw 3 and the roller screw 9 when the number of threads of the screw 5 is mo and the number of planetary rollers is mp. / Di is do / di = mo / (mo-2mp) (2)
Need to be.

本実施例では、mo-=4、mp=1であるので、式(2)の右辺は2.0となり、上記のようにdo/di=2.0となるように設定されている。
本実施例の軸ねじ3の条数は1条であり、ナットねじ5の条数は4条であるので、通常は遊星ローラねじ装置1を組立てることができないとされている。
そこで、本実施例では、軸ねじ3とローラねじ9とナットねじ5のねじ山の間隔、つまりピッチPを同一とし、遊星ローラ6の公転を案内する遊星ピニオンギヤ8の歯の切り方を遊星ローラ6毎に個別に設定して加工し、多条(本実施例では4条)のナットねじ5を有するナット4と1条の軸ねじ3を有するねじ軸2を備えた遊星ローラねじ装置1の組立性を確保している。
In the present embodiment, since mo− = 4 and mp = 1, the right side of Equation (2) is 2.0, and is set so that do / di = 2.0 as described above.
Since the number of shaft screws 3 in this embodiment is one and the number of nut screws 5 is four, the planetary roller screw device 1 cannot normally be assembled.
Therefore, in this embodiment, the distance between the screw threads of the shaft screw 3, the roller screw 9, and the nut screw 5, that is, the pitch P is made the same, and the planetary pinion gear 8 that guides the revolution of the planetary roller 6 is cut by the planetary roller. The planetary roller screw device 1 includes a nut 4 having a multi-thread (four in this embodiment) nut screw 5 and a screw shaft 2 having a single shaft screw 3. Ensures ease of assembly.

このようにすることにより、ナット4を回転させた場合に、ナット4の1回転当りのねじ軸2の進み量を0.959mm、つまり1ピッチP未満の非常に小さい進み量とすることができ、回転トルクの小さいモータを使用しても大きな軸方向の推力を得ることができる。
以上説明したように、本実施例では、遊星ローラねじ装置の軸ねじとローラねじとの噛合ピッチ円直径diに対するナットねじとローラねじとの噛合ピッチ円直径doの比do/diを2.0とした場合に、ナットねじを左捩れの4条とし、ローラねじを左捩れの1条とし、軸ねじを右捩れの1条としたことことによって、ねじ軸の進み量を軸ねじの1ピッチ未満のとすることができ、回転トルクの小さいモータを使用しても大きな軸方向の推力を得ることができる。
In this way, when the nut 4 is rotated, the advance amount of the screw shaft 2 per rotation of the nut 4 can be 0.959 mm, that is, a very small advance amount of less than 1 pitch P. Even if a motor having a small rotational torque is used, a large axial thrust can be obtained.
As described above, in this embodiment, the ratio do / di of the meshing pitch circle diameter do of the nut screw and the roller screw to the meshing pitch circle diameter di of the shaft screw and the roller screw of the planetary roller screw device is 2.0. In this case, the nut screw has four left-handed threads, the roller screw has one left-handed thread, and the shaft screw has one right-handed thread. Even if a motor having a small rotational torque is used, a large axial thrust can be obtained.

また、1条のねじ軸によって大きな推力を発生させることができるリードの小さい遊星ローラねじ装置を得ることができ、軸ねじとローラねじの滑りを防止して摩擦損失を低減することができると共に、これを電動キャリパブレーキの駆動用アクチュエータとして用いた場合には、回転トルクの大きな動力源または減速比の大きな減速機が不要となり、電動キャリパブレーキの駆動用アクチュエータの小型化を図ることができる。   In addition, a planetary roller screw device with a small lead that can generate a large thrust with a single screw shaft can be obtained, and the friction loss can be reduced by preventing the shaft screw and the roller screw from slipping. When this is used as an actuator for driving an electric caliper brake, a power source having a large rotational torque or a reducer having a large reduction ratio is not required, and the electric caliper brake driving actuator can be reduced in size.

本実施例の遊星ローラねじ装置の構成は、上記実施例1と同様である。
なお、上記実施例1と同様の部分は同一の符号を付して、その説明を省略する。
本実施例のねじ軸2の軸ねじ3は右捩れの1条、ナット4のナットねじ5は左捩れの6条、遊星ローラ6のローラねじ9は左捩れの2条であり、遊星ローラ6は5本が等角度ピッチで配置されている。
The configuration of the planetary roller screw device of this embodiment is the same as that of the first embodiment.
In addition, the same code | symbol is attached | subjected to the part similar to the said Example 1, and the description is abbreviate | omitted.
In this embodiment, the shaft screw 3 of the screw shaft 2 is a right-twisted thread, the nut screw 5 of the nut 4 is a left-twisted thread, the roller screw 9 of the planetary roller 6 is a left-twisted thread, and the planetary roller 6. Are arranged at an equiangular pitch.

本実施例のねじ軸2の右捩れの1条の軸ねじ3のねじ山高さは0.87mm、遊星ローラ6のローラねじ9との噛合ピッチ円直径diは14.230mm、ねじのピッチPは1.31mm、圧力角25度であって、台形状のねじ山の先端にはR面取が施されており、これらの成形は切削により加工される。
ナット4の全長は50mm、左捩れの6条のナットねじ5と遊星ローラ6のローラねじ9との噛合ピッチ円直径doは42.691mmであり、これらの成形は切削により加工される。
The thread height of the single right-hand shaft screw 3 of the screw shaft 2 of this embodiment is 0.87 mm, the meshing pitch circle diameter di of the planetary roller 6 with the roller screw 9 is 14.230 mm, and the screw pitch P is The tip of the trapezoidal thread is R chamfered at 1.31 mm and a pressure angle of 25 degrees, and these moldings are processed by cutting.
The total length of the nut 4 is 50 mm, and the meshing pitch circle diameter do of the six left-twisted nut screws 5 and the roller screw 9 of the planetary roller 6 is 42.691 mm, and these moldings are processed by cutting.

8本の遊星ローラ6の左捩れの2条のローラねじ9の噛合ピッチ円直径dpは14.230mm、有効噛合長さは32.5mmであり、ローラねじ9は転造により加工され、隣合う遊星ローラ6のローラねじ9の山径は少なくとも0.5mmの隙間を介して配置されている。
なお、各ねじのピッチPは同一であり、P=1.31mmである。
The meshing pitch circle diameter dp of the two left-twisted roller screws 9 of the eight planetary rollers 6 is 14.230 mm, the effective meshing length is 32.5 mm, and the roller screws 9 are processed by rolling and are adjacent to each other. The crest diameter of the roller screw 9 of the planetary roller 6 is arranged with a gap of at least 0.5 mm.
In addition, the pitch P of each screw is the same, and P = 1.31 mm.

上記のナット4の外径Dは、式(1)を満たすために外径-=は45mmに設定され、研削により成形される。
また、軸ねじ3とローラねじ9との噛合ピッチ円直径diに対するナットねじ5とローラねじ9との噛合ピッチ円直径doの比do/diは、mo-=6、mp=2であるので式(2)の右辺は3.0となり、上記のようにdo/di=3.0となるように設定されている。
The outer diameter D of the nut 4 is set to 45 mm in order to satisfy the formula (1), and is molded by grinding.
The ratio do / di of the meshing pitch circle diameter do of the nut screw 5 and the roller screw 9 to the meshing pitch circle diameter di of the shaft screw 3 and the roller screw 9 is mo− = 6 and mp = 2. The right side of (2) is 3.0, and is set so that do / di = 3.0 as described above.

本実施例の軸ねじ3の条数は1条であり、ナットねじ5の条数は6条であるので、多条(本実施例では6条)のナットねじ5を有するナット4と1条の軸ねじ3を有するねじ軸2を備えた遊星ローラねじ装置1の組立性を確保するために、軸ねじ3とローラねじ9とナットねじ5のねじのピッチPを同一とし、遊星ピニオンギヤ8の歯の切り方は実施例1と同様に遊星ローラ6毎に個別に設定して加工しされている。   Since the number of shaft screws 3 in this embodiment is one and the number of nut screws 5 is six, nuts 4 and 1 each having multiple nut screws 5 (six in this embodiment). In order to ensure the assemblability of the planetary roller screw device 1 having the screw shaft 2 having the shaft screw 3, the pitch P of the shaft screw 3, the roller screw 9 and the nut screw 5 is made the same, and the planetary pinion gear 8 The tooth cutting method is set and processed individually for each planetary roller 6 as in the first embodiment.

このようにすることにより、ナット4を回転させた場合に、ナット4の1回転当りのねじ軸2の進み量を0.983mmとすることができ、本実施例においてもねじ軸2の進み量を1ピッチP未満の非常に小さい進み量とすることができ、回転トルクの小さいモータを使用しても大きな軸方向の推力を得ることができる。
以上説明したように、遊星ローラねじ装置の軸ねじとローラねじとの噛合ピッチ円直径diに対するナットねじとローラねじとの噛合ピッチ円直径doの比do/diを3.0とした場合に、ナットねじを左捩れの6条とし、ローラねじを左捩れの2条とし、軸ねじを右捩れの1条としたことによっても、上記実施例1と同様の効果を得ることができる。
In this way, when the nut 4 is rotated, the advance amount of the screw shaft 2 per rotation of the nut 4 can be set to 0.983 mm, and also in this embodiment, the advance amount of the screw shaft 2 Can be set to a very small advance amount of less than 1 pitch P, and a large axial thrust can be obtained even if a motor having a small rotational torque is used.
As described above, when the ratio do / di of the meshing pitch circle diameter do of the nut screw and the roller screw to the meshing pitch circle diameter di of the shaft screw and the roller screw of the planetary roller screw device is 3.0, The same effects as those of the first embodiment can be obtained also by setting the nut screw to be 6 pieces of left twist, the roller screw to be 2 pieces of left twist, and the shaft screw to be 1 piece of right twist.

なお、上記各実施例においては、理解を容易とするのために具体的な材質や寸法、形状等を用いて説明したが、本発明の特許請求の範囲に記載した諸元以外の諸元はあくまで例示であり、これによって本発明が限定されるものではない。
また、軸ねじとローラねじとナットねじの捩れ方向はそれぞれ右捩れ、左捩れ、左捩れとして説明したが、軸ねじとローラねじとナットねじの捩れ方向を左捩れ、右捩れ、右捩れとした組合せであっても同様の効果を奏することができる。
In each of the above-described embodiments, specific materials, dimensions, shapes, and the like have been described for ease of understanding. However, specifications other than the specifications described in the claims of the present invention are not described. This is merely an example, and the present invention is not limited thereby.
The twist directions of the shaft screw, roller screw, and nut screw were described as right-handed, left-handed, and left-handed, respectively. However, the twisted directions of the shaft screw, roller screw, and nut screw were left-handed, right-handed, and right-handed. Even if it is a combination, the same effect can be produced.

更に、各実施例においては、遊星ローラねじ装置のナットを回転させてねじ軸を軸方向に移動させるとして説明したが、ねじ軸を回転させてナットを移動させる形式の遊星ローラねじ装置に本発明を適用しても同様の効果を奏することができる。   Further, in each of the embodiments, the nut of the planetary roller screw device is rotated and the screw shaft is moved in the axial direction. However, the present invention is applied to a planetary roller screw device of a type in which the nut is moved by rotating the screw shaft. The same effect can be obtained even if is applied.

実施例1の遊星ローラねじ装置を示す側方断面図Side sectional view showing the planetary roller screw device of Embodiment 1

符号の説明Explanation of symbols

1 遊星ローラねじ装置
2 ねじ軸
3 軸ねじ
4 ナット
4a フランジ
5 ナットねじ
6 遊星ローラ
7 軸部
8 遊星ピニオンギヤ
9 ローラねじ
10 保持器
11 リングギヤ
12 リングギヤ押え
DESCRIPTION OF SYMBOLS 1 Planetary roller screw apparatus 2 Screw shaft 3 Shaft screw 4 Nut 4a Flange 5 Nut screw 6 Planetary roller 7 Shaft part 8 Planetary pinion gear 9 Roller screw 10 Cage 11 Ring gear 12 Ring gear presser

Claims (2)

外周面に軸ねじを形成したねじ軸と、内周面に前記ねじ軸と反対方向の捩れ方向でナットねじを形成したナットと、前記軸ねじとナットねじとに嵌合すると共に前記ナットねじと同一方向の捩れ方向のローラねじを外周面に形成した遊星ローラとを備え、前記軸ねじとローラねじとの噛合ピッチ円直径diに対する前記ナットねじとローラねじとの噛合ピッチ円直径doの比do/diを2.0とした遊星ローラねじ装置において、
前記ナットねじを4条とし、前記ローラねじを1条とし、前記軸ねじを1条としたことを特徴とする遊星ローラねじ装置。
A screw shaft having a shaft screw formed on the outer peripheral surface, a nut having a nut screw formed on the inner peripheral surface in a torsion direction opposite to the screw shaft, and the nut screw being fitted to the shaft screw and the nut screw; A planetary roller having a roller screw in the same direction formed on the outer peripheral surface, and a ratio do of a meshing pitch circle diameter do of the nut screw and the roller screw to a meshing pitch circle diameter di of the shaft screw and the roller screw do In a planetary roller screw device in which / di is 2.0,
A planetary roller screw device comprising four nut screws, one roller screw, and one shaft screw.
外周面に軸ねじを形成したねじ軸と、内周面に前記ねじ軸と反対方向の捩れ方向でナットねじを形成したナットと、前記軸ねじとナットねじとに嵌合すると共に前記ナットねじと同一方向の捩れ方向のローラねじを外周面に形成した遊星ローラとを備え、前記軸ねじとローラねじとの噛合ピッチ円直径diに対する前記ナットねじとローラねじとの噛合ピッチ円直径doの比do/diを3.0とした遊星ローラねじ装置において、
前記ナットねじを6条とし、前記ローラねじを2条とし、前記軸ねじを1条としたことを特徴とする遊星ローラねじ装置。
A screw shaft having a shaft screw formed on the outer peripheral surface, a nut having a nut screw formed on the inner peripheral surface in a torsion direction opposite to the screw shaft, and the nut screw being fitted to the shaft screw and the nut screw; A planetary roller having a roller screw in the same direction formed on the outer peripheral surface, and a ratio do of a meshing pitch circle diameter do of the nut screw and the roller screw to a meshing pitch circle diameter di of the shaft screw and the roller screw do In a planetary roller screw device in which / di is 3.0,
A planetary roller screw device comprising six nut screws, two roller screws, and one shaft screw.
JP2005237293A 2005-08-18 2005-08-18 Planetary roller screw device Pending JP2007051684A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2005237293A JP2007051684A (en) 2005-08-18 2005-08-18 Planetary roller screw device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2005237293A JP2007051684A (en) 2005-08-18 2005-08-18 Planetary roller screw device

Publications (1)

Publication Number Publication Date
JP2007051684A true JP2007051684A (en) 2007-03-01

Family

ID=37916271

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2005237293A Pending JP2007051684A (en) 2005-08-18 2005-08-18 Planetary roller screw device

Country Status (1)

Country Link
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010265985A (en) * 2009-05-14 2010-11-25 Ntn Corp Electric linear motion actuator and electric brake device
CN107524772A (en) * 2017-08-21 2017-12-29 北京精密机电控制设备研究所 A kind of big stroke planetary roller screw pair
JP2019511686A (en) * 2016-03-10 2019-04-25 フレニ・ブレンボ エス・ピー・エー Cable tensioning system for parking brake and parking brake therefor
CN114321312A (en) * 2022-03-14 2022-04-12 西安索睿科技有限公司 Differential planetary roller screw pair, assembly tool and assembly process

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010265985A (en) * 2009-05-14 2010-11-25 Ntn Corp Electric linear motion actuator and electric brake device
JP2019511686A (en) * 2016-03-10 2019-04-25 フレニ・ブレンボ エス・ピー・エー Cable tensioning system for parking brake and parking brake therefor
CN107524772A (en) * 2017-08-21 2017-12-29 北京精密机电控制设备研究所 A kind of big stroke planetary roller screw pair
CN114321312A (en) * 2022-03-14 2022-04-12 西安索睿科技有限公司 Differential planetary roller screw pair, assembly tool and assembly process

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