JP2018197006A - Steering device for vehicle - Google Patents

Steering device for vehicle Download PDF

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JP2018197006A
JP2018197006A JP2017101336A JP2017101336A JP2018197006A JP 2018197006 A JP2018197006 A JP 2018197006A JP 2017101336 A JP2017101336 A JP 2017101336A JP 2017101336 A JP2017101336 A JP 2017101336A JP 2018197006 A JP2018197006 A JP 2018197006A
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mechanisms
feed screw
speed reduction
pair
steering
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加藤　健
Takeshi Kato
健 加藤
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Aisin Corp
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Aisin Seiki Co Ltd
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Abstract

To provide a steering device for a vehicle with at least one of an electric telescopic mechanism and an electric tilt mechanism, capable of achieving miniaturization of the whole device by constituting each mechanism using a plurality of electric motors or the like.SOLUTION: At least one of an electric telescopic mechanism and an electric tilt mechanism includes: a plurality of electric motors (11, 21); a plurality of deceleration mechanisms (12, 22) with a plurality of worm gears and worm wheels; and a plurality of feed screw mechanisms (13, 23) with a plurality of trapezoid screw shafts and nut members. The reverse efficiency of all deceleration mechanisms of the plurality of deceleration mechanisms or all mechanisms except one deceleration mechanism is 0 or more. The reverse efficiency of all feed screw mechanisms of the plurality of feed screw mechanisms or all feed screw mechanisms except one feed screw mechanism is 0 or more.SELECTED DRAWING: Figure 1

Description

本発明は、車両のステアリング装置に関し、特に、ステアリングコラムに配設されたステアリングホイールを車体に対して前後方向に駆動する電動テレスコピック機構及びステアリングホイールを上下方向に駆動する電動チルト機構の少なくとも一方の機構を備えたステアリング装置に係る。   The present invention relates to a steering device for a vehicle, and in particular, at least one of an electric telescopic mechanism that drives a steering wheel disposed in a steering column in the front-rear direction with respect to a vehicle body and an electric tilt mechanism that drives the steering wheel in a vertical direction. The present invention relates to a steering device including a mechanism.

上記電動テレスコピック機構及び電動チルト機構を備えたステアリング装置に関し、例えば下記の特許文献１には、一実施形態として電動チルト・テレスコステアリング装置が開示されており、電動チルト機構について、「モータを回転させると、その回転運動が図示しないウォームとウォームホィールとを介してチルトスクリューへ伝わり、該チルトスクリューのねじ込まれた可動ナット部材がジャケットと平行にいずれかの方向へ移動する。すると、リンク部材を介して可動ナット部材に連結されている駆動アームの下部がいずれかの方向へ回動する。該駆動アームの上部の車体前方は第２揺動軸を介して上ブラケットに揺動自在に設けられているので、該駆動アームは第２揺動軸を中心として回動する。該駆動アームの上部であって車体後方側は第１回動軸を介してロアジャケットに連結されているので、ロアジャケットの下端に設けた第１揺動軸を中心としてジャケットが上下方向へ揺動する。ステアリングホィールが希望する高さ位置へ移動したときにモータを止めると、ステアリングホィールの高さ位置が決まる。」と説明されている（特許文献１の段落〔００３５〕に記載。但し、図面引用符号は省略）。   Regarding a steering apparatus including the electric telescopic mechanism and the electric tilt mechanism, for example, the following Patent Document 1 discloses an electric tilt / telescopic steering apparatus as one embodiment. Then, the rotational motion is transmitted to the tilt screw via a worm and a worm wheel (not shown), and the movable nut member into which the tilt screw is screwed moves in either direction in parallel to the jacket. The lower part of the drive arm connected to the movable nut member rotates in either direction, and the front of the vehicle body at the upper part of the drive arm is swingably provided on the upper bracket via the second swing shaft. Therefore, the drive arm is rotated about the second swing shaft, and is located above the drive arm. Since the rear side is connected to the lower jacket via the first rotation shaft, the jacket swings up and down around the first swing shaft provided at the lower end of the lower jacket. The height position of the steering wheel is determined when the motor is stopped when moving to the vertical position ”(described in paragraph [0035] of Patent Document 1; however, reference numerals in drawings are omitted).

また、電動テレスコピック機構については、「モータを回転させると、その回転運動が図示しないウォームとウォームホィールとを介してテレスコスクリューへ伝わる。すると、該テレスコスクリューはロアジャケットに固定した固定ナット部材にねじ込まれているので、ロアジャケットに対してアッパジャケットが軸方向に沿って移動する。ステアリングホィールが車体前後方向の希望する位置へ移動したときにモータを止めると、ステアリングホィールの車体前後方向の位置が決まる。」と説明されている（同段落〔００３６〕に記載。但し、図面引用符号は省略）。   As for the electric telescopic mechanism, “when the motor is rotated, the rotational motion is transmitted to the telescopic screw via a worm and a worm wheel (not shown). Then, the telescopic screw is screwed into a fixed nut member fixed to the lower jacket. The upper jacket moves along the axial direction with respect to the lower jacket, and if the motor is stopped when the steering wheel moves to the desired position in the vehicle longitudinal direction, the position of the steering wheel in the vehicle longitudinal direction is (Described in the same paragraph [0036]. However, reference numerals in the drawings are omitted).

特開２００９−９６４０９号公報JP 2009-96409 A

上記特許文献１に記載の装置においては、電動テレスコピック機構及び電動チルト機構の何れの機構においても、電動モータと、ウォーム及びウォームホィールから成る減速機構と、螺子軸（テレスコスクリュー及びチルトスクリューと呼ばれる）及びナット部材から成る送り螺子機を備え、夫々、単一の電動モータによってテレスコピック作動及びチルト作動の各作動を行うように構成されている。従って、テレスコピック作動及びチルト作動の夫々において、各作動負荷や作動速度に応じた体格の電動モータが必要とされるので、電動モータの小型化には自ずと限界があり、必然的に減速機構等を含めた装置全体の小型化にも限界がある。   In the apparatus described in Patent Document 1, in any of the electric telescopic mechanism and the electric tilt mechanism, an electric motor, a speed reduction mechanism including a worm and a worm wheel, and a screw shaft (referred to as a telescopic screw and a tilt screw). And a feed screw machine composed of a nut member, each configured to perform telescopic operation and tilt operation by a single electric motor. Therefore, in each of the telescopic operation and the tilt operation, an electric motor having a physique corresponding to each operation load and operation speed is required.Therefore, there is a limit to downsizing the electric motor. There is a limit to the miniaturization of the entire device.

そこで、本発明は、電動テレスコピック機構及び電動チルト機構の少なくとも一方の機構を備えた車両のステアリング装置に関し、複数の電動モータ等によって各機構を構成し、装置全体の小型化を可能とするステアリング装置を提供することを課題とする。   Therefore, the present invention relates to a vehicle steering apparatus including at least one of an electric telescopic mechanism and an electric tilt mechanism, and the steering apparatus is configured such that each mechanism is configured by a plurality of electric motors and the like, and the entire apparatus can be reduced in size. It is an issue to provide.

上記の課題を達成するため、本発明は、ステアリングコラムに配設されたステアリングホイールを車体に対して前後方向に駆動する電動テレスコピック機構及び前記ステアリングホイールを上下方向に駆動する電動チルト機構の少なくとも一方の機構を備えた車両のステアリング装置において、前記少なくとも一方の機構が、前記ステアリングコラムに支持される複数の電動モータと、該複数の電動モータに夫々連結される複数のウォームギヤ及び該複数のウォームギヤに夫々噛合する複数のウォームホイールを有する複数の減速機構と、前記複数のウォームホイールに夫々連結される複数の台形螺子軸、及び、該複数の台形螺子軸に螺合し当該複数の台形螺子軸の夫々の回転に応じて軸方向移動する複数のナット部材を具備して成る複数の送り螺子機構とを備え、前記複数の減速機構のうちの全ての減速機構、又は一つの減速機構を除く全ての減速機構の逆効率が０以上であり、且つ、前記複数の送り螺子機構のうちの全ての送り螺子機構、又は一つの送り螺子機構を除く全ての送り螺子機構の逆効率が０以上である構成としたものである。尚、上記の「前後方向」及び「上下方向」は必ずしも路面に対して平行及び垂直な方向を意味するものではなく、路面に対し傾斜している方向を含む（以下、同様）。   In order to achieve the above object, the present invention provides at least one of an electric telescopic mechanism for driving a steering wheel disposed in a steering column in the front-rear direction with respect to the vehicle body and an electric tilt mechanism for driving the steering wheel in the vertical direction. In the vehicle steering apparatus having the above-described mechanism, the at least one mechanism includes a plurality of electric motors supported by the steering column, a plurality of worm gears respectively connected to the plurality of electric motors, and the plurality of worm gears. A plurality of speed reduction mechanisms each having a plurality of worm wheels meshing with each other; a plurality of trapezoidal screw shafts coupled to the plurality of worm wheels; and a plurality of trapezoidal screw shafts screwed to the plurality of trapezoidal screw shafts. A plurality of nut members each having a plurality of nut members that move in the axial direction in accordance with each rotation The reverse efficiency of all the speed reduction mechanisms of the plurality of speed reduction mechanisms, or all the speed reduction mechanisms except for one speed reduction mechanism is 0 or more, and of the plurality of feed screw mechanisms The reverse efficiencies of all the feed screw mechanisms or all the feed screw mechanisms except for one feed screw mechanism are 0 or more. The “front-rear direction” and the “up-down direction” do not necessarily mean directions parallel to and perpendicular to the road surface, but include directions inclined with respect to the road surface (the same applies hereinafter).

即ち、複数（ｎ）の減速機構のうちの全て（ｎ）の減速機構、又は一つの減速機構を除く全て（ｎ−１）の減速機構の逆効率が０以上であり、且つ、複数（ｎ）の送り螺子機構のうちの全ての送り螺子機構（ｎ）、又は一つの送り螺子機構を除く全て（ｎ−１）の送り螺子機構の逆効率が０以上に設定されている（但し、ｎは２以上の整数）。例えば、前記複数の電動モータ、前記複数の減速機構及び前記複数の送り螺子機構は、夫々（ｎ＝２として）、一対の電動モータ、一対の減速機構及び一対の送り螺子機構で構成するとよい。特に、前記一対の電動モータ、前記一対の減速機構及び一対の送り螺子機構が、前記ステアリングコラムの軸を含む鉛直面に対し対称位置に配設されている構成とするとよい。   That is, the reverse efficiency of all (n) reduction mechanisms among a plurality (n) of the reduction mechanisms, or all (n−1) reduction mechanisms excluding one reduction mechanism is 0 or more, and a plurality (n The reverse efficiency of all the feed screw mechanisms (n) of the feed screw mechanisms (n) or all (n-1) feed screw mechanisms excluding one feed screw mechanism is set to 0 or more (provided that n Is an integer of 2 or more. For example, the plurality of electric motors, the plurality of speed reduction mechanisms, and the plurality of feed screw mechanisms may be configured by a pair of electric motors, a pair of speed reduction mechanisms, and a pair of feed screw mechanisms, respectively (assuming n = 2). In particular, the pair of electric motors, the pair of speed reduction mechanisms, and the pair of feed screw mechanisms are preferably arranged at symmetrical positions with respect to a vertical plane including the shaft of the steering column.

本発明は上述のように構成されているので以下の効果を奏する。即ち、本発明のステアリング装置においては、電動テレスコピック機構及び電動チルト機構の少なくとも一方の機構が、ステアリングコラムに支持される複数の電動モータと、複数の電動モータに夫々連結される複数のウォームギヤ及び複数のウォームギヤに夫々噛合する複数のウォームホイールを有する複数の減速機構と、複数のウォームホイールに夫々連結される複数の台形螺子軸、及び、複数の台形螺子軸に螺合し複数の台形螺子軸の夫々の回転に応じて軸方向移動する複数のナット部材を具備して成る複数の送り螺子機構とを備えているので、各電動モータの負荷を抑えることができ、従って、各電動モータの出力を小さくすることができる。この結果、各電動モータの体格を小さくすることができ、各減速機構のギヤモジュールも小さくすることができるので、装置全体の小型化が可能となるだけでなく、車両搭載性が向上する。しかも、複数の減速機構のうちの全ての減速機構、又は一つの減速機構を除く全ての減速機構の逆効率が０以上であり、且つ、複数の送り螺子機構のうちの全ての送り螺子機構、又は一つの送り螺子機構を除く全ての送り螺子機構の逆効率が０以上であるので、各電動モータの出力差や、減速機構の正効率及び送り螺子機構の正効率に差があっても、相互に自動的に調整されるので、適切なトルク伝達を維持することができる。   Since this invention is comprised as mentioned above, there exist the following effects. That is, in the steering device of the present invention, at least one of the electric telescopic mechanism and the electric tilt mechanism includes a plurality of electric motors supported by the steering column, a plurality of worm gears connected to the plurality of electric motors, and a plurality of worm gears. A plurality of speed reduction mechanisms each having a plurality of worm wheels meshing with each of the worm gears, a plurality of trapezoidal screw shafts respectively coupled to the plurality of worm wheels, and a plurality of trapezoidal screw shafts screwed to the plurality of trapezoidal screw shafts And a plurality of feed screw mechanisms comprising a plurality of nut members that move in the axial direction in accordance with the respective rotations, so that the load of each electric motor can be suppressed, and therefore the output of each electric motor can be reduced. Can be small. As a result, the size of each electric motor can be reduced, and the gear module of each reduction mechanism can be reduced, so that not only the entire apparatus can be reduced in size, but also the vehicle mountability is improved. In addition, the reverse efficiency of all the speed reduction mechanisms of the plurality of speed reduction mechanisms, or all the speed reduction mechanisms except for one speed reduction mechanism is 0 or more, and all the feed screw mechanisms of the plurality of feed screw mechanisms, Or, since the reverse efficiency of all the feed screw mechanisms except one feed screw mechanism is 0 or more, even if there is a difference in the output difference of each electric motor, the normal efficiency of the speed reduction mechanism, and the positive efficiency of the feed screw mechanism, Since mutual adjustment is automatically performed, appropriate torque transmission can be maintained.

上記のステアリング装置において、複数の電動モータ、複数の減速機構及び複数の送り螺子機構が、夫々、一対の電動モータ、一対の減速機構及び一対の送り螺子機構で構成されておれば、単一の電動モータ等を用いた従前の機構に比し、最小限の小型化が可能となるだけでなく、車両搭載性が向上する。特に、一対の電動モータ、一対の減速機構及び一対の送り螺子機構が、ステアリングコラムの軸を含む鉛直面に対し対称位置に配設されている構成とすれば、車両搭載性が向上し、調整が容易となる。   In the above steering apparatus, if the plurality of electric motors, the plurality of speed reduction mechanisms, and the plurality of feed screw mechanisms are respectively constituted by a pair of electric motors, a pair of speed reduction mechanisms, and a pair of feed screw mechanisms, a single Compared to a conventional mechanism using an electric motor or the like, not only the minimum size can be reduced, but also the vehicle mountability is improved. In particular, if the configuration in which the pair of electric motors, the pair of speed reduction mechanisms, and the pair of feed screw mechanisms are arranged at symmetrical positions with respect to the vertical plane including the axis of the steering column, the vehicle mountability is improved and the adjustment is performed. Becomes easy.

本発明のステアリング装置に供される電動テレスコピック機構の一実施形態を示す断面図である。It is sectional drawing which shows one Embodiment of the electric telescopic mechanism with which the steering apparatus of this invention is provided. 本発明のステアリング装置に供される電動テレスコピック機構の一実施形態を示す平面図である。It is a top view which shows one Embodiment of the electric telescopic mechanism with which the steering apparatus of this invention is provided. 本発明の一実施形態において、台形螺子軸の逆効率を設定する際のリード角と摩擦係数の関係を示すグラフである。In one Embodiment of this invention, it is a graph which shows the relationship between the lead angle and friction coefficient at the time of setting the reverse efficiency of a trapezoidal screw shaft.

以下、本発明の望ましい実施形態について図面を参照して説明する。図１及び図２は本発明の一実施形態に係るステアリング装置における電動テレスコピック機構の主要構成を示すもので、ステアリングコラムを構成するコラムハウジング２に対し、コラムチューブ３が軸方向移動可能に支持されている。コラムチューブ３内にはステアリングシャフト４が収容されて保持され、ステアリングシャフト４を構成するアッパシャフト４ａの先端にステアリングホイール（図示せず）が固定され、ロアシャフト４ｂの先端に転舵機構（図示せず）が接続される。この転舵機構はステアリングホイールの操作に応じて駆動され、車輪操舵機構（図示せず）を介して操舵輪（図示せず）を転舵するように構成されている。   Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. 1 and 2 show a main configuration of an electric telescopic mechanism in a steering apparatus according to an embodiment of the present invention. A column tube 3 is supported so as to be axially movable with respect to a column housing 2 constituting the steering column. ing. A steering shaft 4 is housed and held in the column tube 3, a steering wheel (not shown) is fixed to the tip of the upper shaft 4a constituting the steering shaft 4, and a steering mechanism (see FIG. 5) is attached to the tip of the lower shaft 4b. Not shown) is connected. This steering mechanism is driven according to the operation of the steering wheel, and is configured to steer a steered wheel (not shown) via a wheel steering mechanism (not shown).

本実施形態においては、コラムハウジング２に一対の電動モータ１１、２１が支持され、夫々に一対の減速機構１２、２２が連結され、更に、夫々に一対の送り螺子機構１３、２３が連結されて二組のテレスコピック駆動機構１０、２０が構成されている。減速機構１２は、電動モータ１１に連結されるウォームギヤ１２ａ及びこれに噛合するウォームホイール１２ｂを有し、減速機構２２は、電動モータ２１に連結されるウォームギヤ２２ａ及びこれに噛合するウォームホイール２２ｂを有している。そして、送り螺子機構１３は、ウォームホイール１２ｂに連結される台形螺子軸１３ａ、及びこれに螺合し台形螺子軸１３ａの回転に応じて軸方向移動するナット部材１３ｂを具備し、送り螺子機構２３は、ウォームホイール２２ｂに連結される台形螺子軸２３ａ、及びこれに螺合し台形螺子軸２３ａの回転に応じて軸方向移動するナット部材２３ｂを具備している。尚、ナット部材１３ｂ、２３ｂは夫々ブラケット３１、３２を介してコラムチューブ３に固定されている。   In the present embodiment, a pair of electric motors 11 and 21 are supported on the column housing 2, a pair of speed reduction mechanisms 12 and 22 are connected to each other, and a pair of feed screw mechanisms 13 and 23 are connected to each other. Two sets of telescopic drive mechanisms 10 and 20 are configured. The speed reduction mechanism 12 has a worm gear 12a connected to the electric motor 11 and a worm wheel 12b meshed therewith, and the speed reduction mechanism 22 has a worm gear 22a connected to the electric motor 21 and a worm wheel 22b meshed therewith. doing. The feed screw mechanism 13 includes a trapezoidal screw shaft 13a connected to the worm wheel 12b, and a nut member 13b that is screwed to the trapezoidal screw shaft 13a and moves in the axial direction in accordance with the rotation of the trapezoidal screw shaft 13a. Includes a trapezoidal screw shaft 23a connected to the worm wheel 22b and a nut member 23b which is screwed to the worm wheel 22b and moves in the axial direction in accordance with the rotation of the trapezoidal screw shaft 23a. The nut members 13b and 23b are fixed to the column tube 3 via brackets 31 and 32, respectively.

而して、電動モータ１１、２１の回転駆動に応じて、コラムハウジング２に対しコラムチューブ３が台形螺子軸１３ａ、２３ａの軸方向に移動し、ステアリングシャフト（図示せず）がコラムチューブ３と共に車体前後方向に移動するように構成されている。即ち、コラムハウジング２に対しコラムチューブ３（及びステアリングシャフト）が同期して車体前後方向に移動するテレスコピック駆動機構１０、２０が構成されており、ステアリングホイール（図示せず）を所望の車体前後方向位置に調整することができる。この場合において、電動モータ１１、２１の出力は従前に比し小さく、従って夫々の体格は小さく、減速機構１２、２２のギヤモジュールも従前に比し小さくすることができるので、装置全体の小型化が可能となるだけでなく、車両搭載性が向上する。   Thus, the column tube 3 moves in the axial direction of the trapezoidal screw shafts 13 a and 23 a with respect to the column housing 2 according to the rotational drive of the electric motors 11 and 21, and the steering shaft (not shown) together with the column tube 3. It is configured to move in the longitudinal direction of the vehicle body. That is, the telescopic drive mechanisms 10 and 20 are configured in which the column tube 3 (and the steering shaft) move in synchronism with the column housing 2 in the vehicle longitudinal direction, and the steering wheel (not shown) is moved in the desired vehicle longitudinal direction. Can be adjusted to the position. In this case, the output of the electric motors 11 and 21 is smaller than before, and therefore the physique of each is small, and the gear modules of the speed reduction mechanisms 12 and 22 can be made smaller than before. Not only becomes possible, but vehicle mounting properties are improved.

本実施形態においては、図１及び図２に示すように、コラムハウジング２の軸を含む鉛直面に対し対称位置に配設されているので、車両搭載性が向上し、調整が容易となる。そして、上記二組のテレスコピック駆動機構１０、２０における一対の減速機構１２、２２の逆効率が０以上に設定され、且つ、一対の送り螺子機構１３、２３の逆効率が０以上に設定されている。送り螺子機構１３、２３について、例えば、圧力角（α＝１５度）の台形螺子軸１３ａ、２３ａを用いたときの逆効率（ηｎ）を０以上に設定する際には、リード角（β）及び摩擦係数（μ）が図３に示す関係に基づいて設定される。尚、減速機構１２、２２及び送り螺子機構１３、２３の何れも、グリス潤滑使用下において逆効率が０以上に設定される。   In the present embodiment, as shown in FIGS. 1 and 2, the vehicle housing is improved and the adjustment is facilitated because it is disposed at a symmetrical position with respect to the vertical plane including the axis of the column housing 2. The reverse efficiency of the pair of speed reduction mechanisms 12 and 22 in the two sets of telescopic drive mechanisms 10 and 20 is set to 0 or more, and the reverse efficiency of the pair of feed screw mechanisms 13 and 23 is set to 0 or more. Yes. For the feed screw mechanisms 13 and 23, for example, when the reverse efficiency (ηn) when using the trapezoidal screw shafts 13a and 23a with a pressure angle (α = 15 degrees) is set to 0 or more, the lead angle (β) And the friction coefficient (μ) are set based on the relationship shown in FIG. The reverse efficiency of each of the speed reduction mechanisms 12 and 22 and the feed screw mechanisms 13 and 23 is set to 0 or more when using grease lubrication.

これにより、本実施形態における複数の減速機構（１２、２２）のうちの全ての減速機構（１２、２２）の逆効率が０以上とされ、且つ、複数の送り螺子機構（１３、２３）のうちの全ての送り螺子機構（１３、２３）の逆効率が０以上とされる。而して、各電動モータ１１、２１の出力差や、減速機構１２、２２の正効率及び送り螺子機構１３、２３の正効率に差があっても、相互に自動的に調整されるので、適切なトルク伝達を維持することができる。   Thereby, the reverse efficiency of all the speed-reduction mechanisms (12, 22) of the speed-reduction mechanisms (12, 22) in this embodiment is set to 0 or more, and the plurality of feed screw mechanisms (13, 23). The reverse efficiency of all of the feed screw mechanisms (13, 23) is 0 or more. Thus, even if there is a difference in the output difference between the electric motors 11 and 21, the positive efficiency of the speed reduction mechanisms 12 and 22, and the positive efficiency of the feed screw mechanisms 13 and 23, they are automatically adjusted to each other. Appropriate torque transmission can be maintained.

あるいは、複数の減速機構（１２、２２）のうちの一方の減速機構（例えば、減速機構１２）の逆効率が０以上であり、且つ、複数の送り螺子機構（１３、２３）のうちの一方の送り螺子機構（例えば、送り螺子機構１３）の逆効率が０以上である構成としてもよい。つまり、この構成及び上記実施形態の何れも、複数（ｎ）の減速機構のうちの全て（ｎ）の減速機構、又は一つの減速機構を除く全て（ｎ−１）の減速機構の逆効率が０以上であり、且つ、複数（ｎ）の送り螺子機構のうちの全ての送り螺子機構（ｎ）、又は一つの送り螺子機構を除く全て（ｎ−１）の送り螺子機構の逆効率が０以上であるという条件を満たしている（但し、ｎは２以上の整数）。   Alternatively, the reverse efficiency of one speed reduction mechanism (for example, speed reduction mechanism 12) of the plurality of speed reduction mechanisms (12, 22) is 0 or more, and one of the plurality of feed screw mechanisms (13, 23). The reverse efficiency of the feed screw mechanism (for example, feed screw mechanism 13) may be 0 or more. That is, in this configuration and any of the above-described embodiments, the reverse efficiency of all (n) reduction mechanisms out of a plurality (n) reduction mechanisms, or all (n−1) reduction mechanisms excluding one reduction mechanism. The reverse efficiency of all the feed screw mechanisms (n) of the plurality (n) of feed screw mechanisms or all (n-1) feed screw mechanisms excluding one feed screw mechanism is 0 or more. The condition that it is above is satisfied (where n is an integer of 2 or more).

また、図示は省略するが、ステアリングコラムを上下方向に駆動する電動チルト機構を設け、上記二組のテレスコピック駆動機構１０、２０と同様、二組のチルト駆動機構（図示せず）を備えたものとし、一対のリンク機構（図示せず）を介してコラムハウジング２を揺動し得るように構成することとしてもよく、これによりステアリングホイール（図示せず）を所望の車体上下方向位置に調整することができる。更に、上記電動テレスコピック機構及び電動チルト機構の両機構を備え、夫々に、二組のテレスコピック駆動機構１０、２０及び二組のチルト駆動機構（図示せず）備えた装置とすることとしてもよく、この場合には計４個の電動モータ、減速機構及び送り螺子機構が設けられるが、電動モータの体格は小さく何れも小型となるので、従前の計２個の電動モータ等を備えた装置に比し、装置全体として特に大型となることはない。   Although not shown, an electric tilt mechanism for driving the steering column in the vertical direction is provided, and two sets of tilt drive mechanisms (not shown) are provided, similar to the two sets of telescopic drive mechanisms 10 and 20. The column housing 2 may be configured to be swingable via a pair of link mechanisms (not shown), thereby adjusting the steering wheel (not shown) to a desired vertical position of the vehicle body. be able to. Furthermore, both the electric telescopic mechanism and the electric tilt mechanism are provided, and each of them may be a device including two sets of telescopic drive mechanisms 10 and 20 and two sets of tilt drive mechanisms (not shown). In this case, a total of four electric motors, a speed reduction mechanism, and a feed screw mechanism are provided. However, since the size of the electric motor is small and all of them are small, compared with the conventional apparatus including two electric motors and the like. However, the entire device is not particularly large.

２ コラムハウジング（ステアリングコラム）
３ コラムチューブ
４ ステアリングシャフト
１０、２０ テレスコピック駆動機構
１１、２１ 電動モータ
１２、２２ 減速機構
１２ａ、２２ａ ウォームギヤ
１２ｂ、２２ｂ ウォームホイール
１３、２３ 送り螺子機構
１３ａ、２３ａ 台形螺子軸
１３ｂ、２３ｂ ナット部材 2 Column housing (steering column)
3 Column tube 4 Steering shaft 10, 20 Telescopic drive mechanism 11, 21 Electric motor 12, 22 Deceleration mechanism 12a, 22a Worm gear 12b, 22b Worm wheel 13, 23 Feed screw mechanism 13a, 23a Trapezoidal screw shaft 13b, 23b Nut member

Claims (3)

ステアリングコラムに配設されたステアリングホイールを車体に対して前後方向に駆動する電動テレスコピック機構及び前記ステアリングホイールを上下方向に駆動する電動チルト機構の少なくとも一方の機構を備えた車両のステアリング装置であって、
前記少なくとも一方の機構が、
前記ステアリングコラムに支持される複数の電動モータと、
該複数の電動モータに夫々連結される複数のウォームギヤ及び該複数のウォームギヤに夫々噛合する複数のウォームホイールを有する複数の減速機構と、
前記複数のウォームホイールに夫々連結される複数の台形螺子軸、及び、該複数の台形螺子軸に螺合し当該複数の台形螺子軸の夫々の回転に応じて軸方向移動する複数のナット部材を具備して成る複数の送り螺子機構とを備え、
前記複数の減速機構のうちの全ての減速機構、又は一つの減速機構を除く全ての減速機構の逆効率が０以上であり、且つ、前記複数の送り螺子機構のうちの全ての送り螺子機構、又は一つの送り螺子機構を除く全ての送り螺子機構の逆効率が０以上であることを特徴とする車両のステアリング装置。 A vehicle steering apparatus provided with at least one of an electric telescopic mechanism that drives a steering wheel disposed in a steering column in a longitudinal direction with respect to a vehicle body and an electric tilt mechanism that drives the steering wheel in a vertical direction. ,
The at least one mechanism is
A plurality of electric motors supported by the steering column;
A plurality of reduction gear mechanisms each having a plurality of worm gears respectively connected to the plurality of electric motors and a plurality of worm wheels meshing with the plurality of worm gears;
A plurality of trapezoidal screw shafts respectively connected to the plurality of worm wheels, and a plurality of nut members that are screwed into the plurality of trapezoidal screw shafts and move in the axial direction in accordance with the rotation of the plurality of trapezoidal screw shafts. A plurality of feed screw mechanisms comprising,
The reverse efficiency of all the speed reduction mechanisms of the plurality of speed reduction mechanisms, or all the speed reduction mechanisms excluding one speed reduction mechanism is 0 or more, and all the feed screw mechanisms of the plurality of feed screw mechanisms, Or the reverse efficiency of all the feed screw mechanisms except one feed screw mechanism is 0 or more, The steering apparatus of the vehicle characterized by the above-mentioned. 前記複数の電動モータ、前記複数の減速機構及び前記複数の送り螺子機構が、夫々、一対の電動モータ、一対の減速機構及び一対の送り螺子機構で構成されていることを特徴とすることを特徴とする請求項１記載の車両のステアリング装置。 The plurality of electric motors, the plurality of speed reduction mechanisms, and the plurality of feed screw mechanisms are respectively composed of a pair of electric motors, a pair of speed reduction mechanisms, and a pair of feed screw mechanisms. The vehicle steering apparatus according to claim 1. 前記一対の電動モータ、前記一対の減速機構及び一対の送り螺子機構が、前記ステアリングコラムの軸を含む鉛直面に対し対称位置に配設されていることを特徴とする請求項２記載の車両のステアリング装置。 3. The vehicle according to claim 2, wherein the pair of electric motors, the pair of speed reduction mechanisms, and the pair of feed screw mechanisms are disposed at symmetrical positions with respect to a vertical plane including the shaft of the steering column. Steering device.
JP2017101336A 2017-05-23 2017-05-23 Steering device for vehicle Pending JP2018197006A (en)

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