JP2015087224A5

JP2015087224A5 -

Info

Publication number: JP2015087224A5
Application number: JP2013225481A
Authority: JP
Filing date: 2013-10-30
Publication date: 2016-12-15
Anticipated expiration: 2033-10-30

Description

本発明のトルク測定装置付回転伝達装置は、ハウジングと、回転軸ユニットと、第一歯車と、第二歯車と、連結軸と、第一エンコーダと、第二エンコーダと、１個のセンサユニットとを備える。
このうちの回転軸ユニットは、それぞれが中空状の第一、第二両回転軸と、中空状のトーションバーとを備える。このうちの第一、第二両回転軸は、互いに同心に配置されると共に、互いの一端部同士を相対回転可能に組み合わされた状態で、前記ハウジングに対して回転自在に支持されている。又、前記トーションバーは、前記第一、第二両回転軸の内径側に、これら第一、第二両回転軸と同心に配置されると共に、一端部をこの第一回転軸に、他端部をこの第二回転軸に、それぞれ相対回転不能に連結されている。
又、前記第一歯車は、前記第一回転軸の外周面の軸方向中間部に固定されている。
又、前記第二歯車は、前記第二回転軸の外周面の軸方向中間部に固定されている。
又、前記トーションバーの軸方向中間部のうち、トルクを伝達する際に弾性的に捩れ変形する部分（このトーションバーのうち、前記第一、第二両回転軸に対し相対回転不能に連結した両端部同士の間に挟まれた部分）である、ばね部の軸方向寸法が、前記第一、第二両歯車同士の軸方向間隔よりも大きくなっている。
又、前記連結軸は、前記トーションバーの内径側に、このトーションバーと同心に配置されると共に、一端部を前記第一、第二両回転軸のうちの一方の回転軸に対して相対回転不能に連結された状態で、他端部を前記トーションバーの端部から軸方向に突出させている。
又、前記第一エンコーダは、前記連結軸の他端部に対して固定された状態で、この連結軸と同心で円環状（例えば円筒状や円輪状）の第一被検出部を有すると共に、この第一被検出部の磁気特性を円周方向に関して交互に且つ等ピッチで変化させている。
又、前記第二エンコーダは、前記第一、第二両回転軸のうちの他方の回転軸の他端側部分に対して固定された状態で、この他方の回転軸と同心で円環状（例えば円筒状や円輪状）の第二被検出部を有すると共に、この第二被検出部の磁気特性を円周方向に関して交互に且つ等ピッチで変化させている。
又、前記第一、第二両被検出部は、互いに近接配置（例えば１０mm以内、より好ましくは５mm以内の間隔をあけて配置）されている。
又、前記センサユニットは、その一部を前記第一、第二両被検出部に対向させた状態で、前記ハウジングに対して支持されており、且つ、これら第一、第二両被検出部のうちで自身が対向している部分の磁気特性変化に対応して出力信号を変化させる。この様なセンサユニットとしては、例えば、前記第一被検出部に対向させた第一センサと、前記第二被検出部に対向させた第二センサとを備え、これら第一、第二両センサが、それぞれ前記第一、第二両被検出部のうちで自身が対向している部分の磁気特性の変化に対応して出力信号を変化させる構成を有するものを採用できる。
A rotation transmission device with a torque measuring device of the present invention includes a housing, a rotary shaft unit, a first gear, a second gear, a connecting shaft, a first encoder, a second encoder, and one sensor unit. Is provided.
Of these, the rotating shaft unit includes both hollow first and second rotating shafts and a hollow torsion bar. Of these, the first and second rotating shafts are arranged concentrically with each other, and are rotatably supported with respect to the housing in a state where their one end portions are combined so as to be relatively rotatable. The torsion bar is disposed on the inner diameter side of the first and second rotary shafts, concentrically with the first and second rotary shafts, and has one end at the first rotary shaft and the other end. The parts are connected to the second rotating shaft so as not to rotate relative to each other.
The first gear is fixed to an intermediate portion in the axial direction of the outer peripheral surface of the first rotating shaft.
The second gear is fixed to an intermediate portion in the axial direction of the outer peripheral surface of the second rotating shaft.
Of the axially intermediate portion of the torsion bar, a portion that elastically twists and deforms when transmitting torque (the torsion bar is connected to the first and second rotating shafts so as not to rotate relative to each other). The axial dimension of the spring portion, which is a portion sandwiched between both ends, is larger than the axial interval between the first and second gears.
The connecting shaft is disposed concentrically with the torsion bar on the inner diameter side of the torsion bar, and has one end portion relatively rotated with respect to one of the first and second rotating shafts. The other end portion is protruded in the axial direction from the end portion of the torsion bar in a state where the connection is impossible.
In addition, the first encoder has a first detected portion that is concentric with the connecting shaft and is annular (for example, cylindrical or annular) in a state of being fixed to the other end of the connecting shaft, The magnetic characteristics of the first detected part are changed alternately and at equal pitches in the circumferential direction.
The second encoder is fixed to the other end portion of the other rotary shaft of the first and second rotary shafts, and concentric with the other rotary shaft (for example, In addition to having a second detected portion having a cylindrical shape or an annular shape, the magnetic characteristics of the second detected portion are changed alternately and at equal pitches in the circumferential direction.
The first and second detected parts are arranged close to each other (for example, arranged with an interval of within 10 mm, more preferably within 5 mm).
The sensor unit is supported with respect to the housing in a state where a part of the sensor unit is opposed to the first and second detected parts, and the first and second detected parts. Among them, the output signal is changed in response to the change in the magnetic characteristic of the part facing itself. As such a sensor unit, for example, a first sensor opposed to the first detected portion and a second sensor opposed to the second detected portion are provided. However, it is possible to employ one having a configuration in which the output signal is changed in response to the change in the magnetic characteristics of the portion of the first and second detected parts facing each other.

特に、本発明のトルク測定装置付回転伝達装置の場合には、前記回転軸ユニットが前記ハウジングに対し、複数の転がり軸受により回転自在に支持されている。そして、前記第一、第二両回転軸のうちの片方の回転軸と、これら各転がり軸受のうちでこの片方の回転軸を前記ハウジングに対し回転自在に支持する転がり軸受を構成する内輪と、前記トーションバーとが、一体に造られている。
In particular, in the case of the rotation transmission device with a torque measuring device of the present invention, the rotary shaft unit is rotatably supported by the plurality of rolling bearings with respect to the housing. Then, an inner ring which constitutes the first, and one of the rotating shaft of the second double rotary shaft, a rolling bearing for supporting the rotary shaft of the one among the respective rolling bearings rotatably relative to the housing, The torsion bar is integrally formed.

又、本発明の場合、第一、第二両回転軸のうちの片方の回転軸と、この片方の回転軸を前記ハウジングに対し回転自在に支持する転がり軸受を構成する内輪と、前記トーションバーとを、一体に造っている。この為、例えば前述の図７〜１６に示した先発明に係る第１例の構造の様に、入力軸１３（出力軸１４）と、円すいころ軸受２９ａ（２９ｂ）を構成する内輪３０ａ（３０ｂ）と、トーションバー１５とを別体に設けた場合と比較して、トルク測定装置付回転伝達装置を構成する各部材の製造コスト、管理コスト、組立コストを抑えられ、このトルク測定装置付回転伝達装置の製造コストの低減を図れる。
In the case of the present invention, first, the one of the rotation axis of the second double rotary shaft, an inner ring constituting the rotatably supporting rolling bearing axis of rotation of the one relative to the housing, said torsion bar And make it together. For this reason, for example, like the structure of the first example according to the previous invention shown in FIGS. ) And the torsion bar 15 are separately provided, the manufacturing cost, the management cost, and the assembly cost of each member constituting the rotation transmission device with the torque measuring device can be suppressed. The manufacturing cost of the transmission device can be reduced.

Claims

A housing, a rotary shaft unit, a first gear, a second gear, a connecting shaft, a first encoder, a second encoder, and one sensor unit;
Among these, the rotary shaft unit includes both hollow first and second rotary shafts and a hollow torsion bar, and the first and second rotary shafts are concentric with each other. And is rotatably supported with respect to the housing in a state where the one end portions of the first and second rotation shafts are combined so as to be relatively rotatable. The first and second rotary shafts are concentrically arranged on the inner diameter side, and one end is connected to the first rotary shaft and the other end is connected to the second rotary shaft so as not to be relatively rotatable. And
The first gear is fixed to an axially intermediate portion of the outer peripheral surface of the first rotating shaft,
The second gear is fixed to an axially intermediate portion of the outer peripheral surface of the second rotating shaft,
Of the axially intermediate portion of the torsion bar, the axial dimension of the spring portion, which is a portion that elastically twists and deforms when transmitting torque, is greater than the axial spacing between the first and second gears. It ’s getting bigger,
The connecting shaft is disposed concentrically with the torsion bar on the inner diameter side of the torsion bar, and one end portion thereof cannot be rotated relative to one of the first and second rotating shafts. In the connected state, the other end is projected in the axial direction from the end of the torsion bar,
The first encoder has an annular first detected portion concentric with the connecting shaft in a state of being fixed with respect to the other end portion of the connecting shaft, and has magnetic characteristics of the first detected portion. It is changed alternately and at equal pitches in the circumferential direction.
The second encoder is fixed to the other end portion of the other rotary shaft of the first and second rotary shafts, and concentric with the other rotary shaft. While having a detection unit, the magnetic characteristics of the second detection target part are changed alternately and at equal pitches in the circumferential direction,
The first and second detected parts are arranged close to each other,
The sensor unit is supported with respect to the housing in a state where a part of the sensor unit is opposed to the first and second detected parts, and among the first and second detected parts, A rotation transmission device with a torque measuring device that changes an output signal in response to a change in magnetic characteristics of a portion facing itself,
The respect to the axis of rotation units the housing, is rotatably supported by a plurality of rolling bearings, the first, and one of the rotating shaft of the second double rotary shaft, the one among the respective rolling bearings A rotation transmission device with a torque measuring device, wherein an inner ring constituting a rolling bearing that rotatably supports the rotating shaft of the housing with respect to the housing and the torsion bar are integrally formed.