TWM617664U

TWM617664U - Electric power steering gear

Info

Publication number: TWM617664U
Application number: TW110203698U
Authority: TW
Inventors: 李茂碷
Original assignee: 國際精工股份有限公司
Priority date: 2021-04-07
Filing date: 2021-04-07
Publication date: 2021-10-01

Abstract

本創作公開了一種電動助力轉向器，其包含一殼體；一轉向軸，能夠往復位移地設置在殼體內並伸出殼體兩端，其軸體具有齒條部及螺桿部；一螺帽，其組設在殼體內並螺接螺桿部；一馬達，其受引擎控制單元(ECU)控制，其設置於殼體內，其具有一外轉轉子，外轉轉子結合於螺帽以驅動螺帽轉動，進而帶動桿體於殼體內往復位移；其中該螺帽的本體外環面設有支承法蘭，支承法蘭鎖固在殼體內，於支承法蘭與螺帽本體之間夾設有滾動件，藉此形成可穩固支承螺帽的精簡機構軸承，使電動助力轉向器達到精省體積與製造成本的目的。This creation discloses an electric power steering device, which includes a housing; a steering shaft, which is arranged in the housing so as to be able to move back and extends out of the two ends of the housing. The shaft body has a rack part and a screw part; and a nut , It is assembled in the housing and screwed to the screw part; a motor, which is controlled by the engine control unit (ECU), is set in the housing, and has an outer rotor that is combined with the nut to drive The nut rotates, and then drives the rod body to move back and forth in the housing; wherein the outer ring surface of the nut body is provided with a supporting flange, the supporting flange is locked in the housing, and is sandwiched between the supporting flange and the nut body There are rolling parts, thereby forming a simplified mechanism bearing that can stably support the nut, so that the electric power steering device can achieve the purpose of saving volume and manufacturing cost.

Description

電動助力轉向器Electric power steering

本創作係關於一種電動助力轉向器，尤指一種可藉由外轉馬達提供直驅動力引動螺帽驅動轉向軸的RD型EPS(Rack-direct- drive type electric power steering)的電動助力轉向器設計。 This creation is about an electric power steering, especially an RD type EPS (Rack-direct- drive type electric power steering).

電動助力轉向(Electric Power Steering, EPS)系統是一種藉由電機提供輔助轉矩的動力轉向系統，相對於傳統的液壓助力轉向系統，電動助力轉向系統能夠在車速改變時調整馬達的轉速進而提供最佳化的轉向助力，同時兼顧低速時的便利性以及高速時的穩定性，此外由於減少了油泵、液壓油管等元件，因此有利於搭配至不同的車型上，隨著先進駕駛輔助系統(Advanced Driver Assistance System, ADAS)以及無人自動駕駛技術的引進，方向盤以及轉向柱逐漸成為非必要的元件，因此減少電動助力轉向機構體積以及節省成本成為一個需要解決的問題。The Electric Power Steering (EPS) system is a power steering system that uses an electric motor to provide auxiliary torque. Compared with the traditional hydraulic power steering system, the electric power steering system can adjust the motor speed when the vehicle speed changes to provide the best Optimized steering assistance, while taking into account the convenience at low speeds and the stability at high speeds. In addition, due to the reduction of oil pumps, hydraulic tubing and other components, it is beneficial to match with different models. With the advanced driver assistance system (Advanced Driver With the introduction of assistance system (ADAS) and unmanned automatic driving technology, the steering wheel and steering column have gradually become unnecessary components. Therefore, reducing the volume of the electric power steering mechanism and saving costs have become a problem that needs to be solved.

此外，為了配合不同的車型，開發人員也致力於減少減速機構以及傳動機構中元件的數量，避免元件因為老化或是元件彼此之間連接的干涉、間隙等誤差，累積而影響計算車體轉角或輸出軸位置的可靠度。然而，上述前案皆需設置方向盤及轉向柱，並將用於量測轉向角度的感測器設置於轉向柱，因此，用於安裝轉向柱的殼體需預留設置感測器的空間，而造成整體系統體積龐大的缺點，且在裝配時，轉向柱與感測器的組裝結構以及相互配置關係會使得裝配上的工序較多並且複雜，不只降低了組裝便利性，還提升了組裝的時間進而提升了生產成本，為此，RD型EPS的電動助力轉向器乃較能達到縮減機構組件空間的要求。In addition, in order to match different models, the developers are also committed to reducing the number of components in the deceleration mechanism and the transmission mechanism to avoid the accumulation of components due to aging or the interference between the components, the gap and other errors, which will affect the calculation of the car body corner or Reliability of output shaft position. However, the above-mentioned previous proposals all require a steering wheel and a steering column, and a sensor for measuring the steering angle is installed on the steering column. Therefore, the housing for installing the steering column needs to reserve space for the sensor. As a result, the overall system is bulky, and during assembly, the assembly structure and mutual configuration of the steering column and the sensor will make the assembly process more and more complicated, which not only reduces the assembly convenience, but also improves the assembly process. Time has further increased the production cost. For this reason, the electric power steering of the RD EPS can better meet the requirements of reducing the space of the mechanism components.

惟該RD型EPS的電動助力轉向器所應用的驅動馬達，係採用中空型的內轉馬達，如中華民國專利M590555號所揭示「電動助力轉向系統」，其馬達採用內轉轉子的形式，導致馬達在結構尺寸上無法有多極數的設置，而極數較少的馬達會有高轉速、低扭矩的特性，致使在直接驅動需要高精度靈敏控制轉向軸作動的滾珠螺帽上時，易會有控制點偏差的現象。However, the drive motor used in the electric power steering of the RD EPS adopts a hollow inner-rotating motor. For example, the "Electric Power Steering System" disclosed in the Republic of China Patent No. M590555, the motor adopts the form of an inner-rotating rotor. As a result, the structure and size of the motor cannot be set with multiple poles, and a motor with a small number of poles will have the characteristics of high speed and low torque, resulting in direct drive on the ball nut that requires high precision and sensitive control of the steering shaft. It is easy to have the phenomenon of control point deviation.

有鑑於此，本創作人基於習知RD型EPS的電動助力轉向器尚有改良空間，乃提出本創作電動助力轉向器，使馬達能有較為有效率精準的動力輸出，減少螺帽伺服機構整體組件，達到組裝便利性提升、降低生產成本的產業經濟效益。In view of this, the author still has room for improvement based on the conventional RD EPS-based electric power steering. He proposes this creative electric power steering to enable the motor to have a more efficient and accurate power output and reduce the overall nut servo mechanism. Components, to achieve the industrial economic benefits of improving assembly convenience and reducing production costs.

本創作之主目的在提供一種電動助力轉向器，使電動助力方向機能夠達到縮減機構組件空間的目的，使該螺帽配合一支承法蘭形成一精簡機構之軸承。The main purpose of this creation is to provide an electric power steering gear, so that the electric power steering gear can achieve the purpose of reducing the space of the mechanism components, so that the nut cooperates with a supporting flange to form a simplified mechanism bearing.

本創作之次一目的在提供一種電動助力轉向器，該馬達採用外轉驅動形式，使馬達的外轉轉子直接帶動螺帽以驅動轉向軸，達到高精準度的驅動轉向軸之目的，並使馬達極數提升達到低轉數與高扭矩動力輸出的目的。The second purpose of this creation is to provide an electric power steering, the motor adopts the form of external rotation drive, so that the external rotation rotor of the motor directly drives the nut to drive the steering shaft to achieve the purpose of driving the steering shaft with high precision. The number of poles of the motor is increased to achieve the purpose of low revolutions and high torque power output.

為了達到上述目的，本創作之電動助力轉向器，其較佳的技術方案包含一殼體、一轉向軸、一螺帽及一馬達，其中：In order to achieve the above-mentioned purpose, the electric power steering device of this invention preferably includes a housing, a steering shaft, a nut and a motor, among which:

該殼體具有一第一殼體與一第二殼體，該第一殼體與該第二殼體為相連結的管體；The casing has a first casing and a second casing, and the first casing and the second casing are connected pipe bodies;

該轉向軸能夠軸向往復位移地設置在該殼體內，且其兩端分別從該第一殼體與該第二殼體伸出，該轉向軸的軸體具有一齒條部及一螺桿部；The steering shaft is arranged in the housing such that it can be moved back and forth in the axial direction, and its two ends respectively protrude from the first housing and the second housing. The shaft body of the steering shaft has a rack portion and a screw portion ；

該螺帽組設在該殼體內並螺接該轉向軸的螺桿部，該螺帽通過一支承法蘭組設在該殼體內；其中該支承法蘭形成中央具有一通孔的環體，該通孔的孔壁凹設有一第一珠溝；該螺帽的外環面具有一第二珠溝，該第一珠溝與第二珠溝之間夾設複數個滾動件；The nut is assembled in the housing and is screwed to the screw part of the steering shaft. The nut is assembled in the housing through a supporting flange; wherein the supporting flange forms a ring with a through hole in the center. The wall of the hole is recessed with a first bead groove; the outer ring of the nut has a second bead groove, and a plurality of rolling elements are sandwiched between the first bead groove and the second bead groove;

該馬達設置於該殼體內以帶動該螺帽轉動，進而驅動該轉向軸於該殼體內軸向往復位移；該馬達具有一中空狀的馬達定子及一外轉轉子，該馬達定子供該轉向軸穿過其中空部位，該外轉轉子呈筒杯形，該外轉轉子的一端與該螺帽相結合而得以驅動該螺帽轉動。The motor is arranged in the housing to drive the nut to rotate, thereby driving the steering shaft to move axially in the housing; the motor has a hollow motor stator and an outer rotor, and the motor stator provides the steering The shaft passes through the hollow part, the outer rotating rotor is in a cylindrical cup shape, and one end of the outer rotating rotor is combined with the nut to drive the nut to rotate.

上述的電動助力轉向器中，該第一殼體為一多階管徑的管體，該第一殼體較大管徑的一端內部形成一第一容置空間；該第二殼體為一多階管徑的管體，該第二殼體較大管徑的一端內部形成有一第二容置空間；該支承法蘭的環體開設有複數個鎖孔，及該第一殼體鎖設在該支承法蘭一側，該第二殼體鎖設在該支承法蘭的另一側。In the above-mentioned electric power steering gear, the first housing is a pipe with a multi-stage pipe diameter, and an end of the first housing with a larger pipe diameter forms a first accommodating space; the second housing is a For a pipe body with a multi-stage pipe diameter, a second accommodating space is formed inside one end of the second housing with a larger pipe diameter; the ring body of the supporting flange is provided with a plurality of locking holes, and the first housing is locked On one side of the supporting flange, the second housing is locked on the other side of the supporting flange.

上述的電動助力轉向器中，該馬達的馬達定子鎖固在該第一殼體的第一容置空間中，及該螺帽容設在第二殼體的第二容置空間中。In the above-mentioned electric power steering gear, the motor stator of the motor is locked in the first accommodating space of the first housing, and the nut is accommodated in the second accommodating space of the second housing.

上述的電動助力轉向器中，該滾動件為滾珠或滾柱其中之一。In the above-mentioned electric power steering gear, the rolling element is one of balls or rollers.

上述的電動助力轉向器中，該馬達的外轉轉子於筒身徑向內壁面上結合有複數個感應磁石，該感應磁石相對於該外轉轉子徑向筒身之另側面張設有一支撐環，該支撐環位於該感應磁石與該馬達定子的圓周之間。In the above-mentioned electric power steering device, the outer rotating rotor of the motor is combined with a plurality of induction magnets on the radial inner wall surface of the cylinder body, and the induction magnet is provided with a plurality of inductive magnets relative to the other side of the radial cylinder body of the outer rotating rotor. The support ring is located between the induction magnet and the circumference of the motor stator.

上述的電動助力轉向器中，該外轉轉子的筒杯形的底部設有複數個穿孔供螺絲穿設以與該螺帽相鎖合。In the above-mentioned electric power steering gear, the cylindrical cup-shaped bottom of the outer rotor is provided with a plurality of perforations for screws to pass through to lock with the nut.

上述的電動助力轉向器中，該支撐環為不鏽鋼材質，其直徑及形體小於該外轉轉子。In the above-mentioned electric power steering gear, the support ring is made of stainless steel, and its diameter and shape are smaller than the outer rotor.

茲依附圖實施例將本創作之結構特徵及其他之作用、目的詳細說明如下：Here is a detailed description of the structural features and other functions and purposes of this creation based on the embodiments of the drawings as follows:

參閱圖1、圖2及圖3所示，本創作之電動助力轉向器，係一種外轉馬達提供直驅動力引動一螺帽以驅動一轉向軸的RD型EPS(Rack-direct-drive type electric power steering)的電動助力轉向器，其較佳的具體實施例包含一殼體1、一轉向軸2、一螺帽3及一馬達4，其中：Refer to Figure 1, Figure 2 and Figure 3, the electric power steering of this creation is an RD type EPS (Rack-direct-drive type electric power steering). A preferred embodiment of the electric power steering includes a housing 1, a steering shaft 2, a nut 3, and a motor 4, wherein:

該殼體1包含一第一殼體11與一第二殼體12，該第一殼體11為一多階管徑的管體，於管體一端較大階管徑內部形成有一第一容置空間13，該第一容置空間13係供該馬達4容設；該第二殼體12亦為一多階管徑的管體，於管體一端較大階管徑內部形成有一第二容置空間14，該第二容置空間14係供該螺帽3容設；The housing 1 includes a first housing 11 and a second housing 12. The first housing 11 is a pipe with a multi-stage pipe diameter. A first housing is formed inside the larger pipe diameter at one end of the pipe. The first accommodating space 13 is for the motor 4 to be accommodated; the second housing 12 is also a multi-stage pipe body with a larger-stage pipe diameter at one end of the pipe body. An accommodating space 14, the second accommodating space 14 is for the nut 3 to be accommodated;

該轉向軸2能夠軸向往復位移地設置在該殼體1內(如圖2及圖3所示)，且其兩端分別從該第一殼體11與該第二殼體12伸出，該轉向軸2的軸體具有一齒條部21及一螺桿部22；The steering shaft 2 is arranged in the housing 1 so as to be able to move back and forth in the axial direction (as shown in Figs. 2 and 3), and its two ends respectively protrude from the first housing 11 and the second housing 12, The shaft body of the steering shaft 2 has a rack portion 21 and a screw portion 22;

該螺帽3組設在該殼體1內並螺接該轉向軸2的螺桿部22，其主要係以滾珠螺帽螺合該轉向軸2以提供一引動效用，該螺帽3與傳統滾珠螺帽結構相當，於此並不再贅述；本創作該螺帽3係透過一支承法蘭31而組設在該殼體1內，該支承法蘭31係中央形成有一通孔32的環體，環體開設有複數個鎖孔33，該通孔32的孔壁凹設有一第一珠溝34；該螺帽3於本體的外環面選定處加工成型有一第二珠溝35，於該第一珠溝34與第二珠溝35之間夾設有複數個滾動件36，該滾動件36可為滾珠或滾柱，藉此形成一可穩固支承螺帽3的精簡機構軸承；The nut 3 is assembled in the housing 1 and is screwed to the screw part 22 of the steering shaft 2. It is mainly screwed to the steering shaft 2 with a ball nut to provide a driving effect. The nut 3 is similar to traditional ball The structure of the nut is equivalent, so I won’t repeat it here. In this creation, the nut 3 is assembled in the housing 1 through a supporting flange 31, and the supporting flange 31 is a ring with a through hole 32 formed in the center. , The ring body is provided with a plurality of locking holes 33, and the wall of the through hole 32 is recessed with a first bead groove 34; A plurality of rolling elements 36 are interposed between the bead groove 34 and the second bead groove 35, and the rolling elements 36 can be balls or rollers, thereby forming a streamlined mechanism bearing that can stably support the nut 3;

該馬達4設於該殼體1內受引擎控制單元(ECU)控制，進而驅動該螺帽3轉動，用以帶動該轉向軸2於該殼體1內軸項往復位移；該馬達4為一中空馬達形式，其係由一中空狀的馬達定子41及一外轉轉子42所構成，中空狀的該馬達定子41提供該轉向軸2能穿過其中空部位，使該馬達4形成套設在該轉向軸2上驅動的構造；該外轉轉子42採多極數設計，其略呈一筒杯形，於該外轉轉子42的筒身徑向內壁面上結合有複數個感應磁石421，該感應磁石421相對於該外轉轉子42徑向筒身的另一側面設有一支撐環422，使該支撐環位於該感應磁石與該馬達定子41的圓周之間；該支撐環422為不鏽鋼材質製成，其直徑及形體略小於該外轉轉子42；該外轉轉子42筒杯底部設有複數個穿孔423，該複數個穿孔423係供該外轉轉子42與該螺帽3相鎖合，進而使該外轉轉子42得以驅動該螺帽3轉動；The motor 4 is arranged in the housing 1 and is controlled by an engine control unit (ECU) to drive the nut 3 to rotate, so as to drive the steering shaft 2 to move back and forth on the inner shaft of the housing 1. The motor 4 is a The hollow motor form is composed of a hollow motor stator 41 and an outer rotor 42. The hollow motor stator 41 allows the steering shaft 2 to pass through the hollow part, so that the motor 4 forms a sleeve. The structure of driving on the steering shaft 2; the outer rotor 42 adopts a multi-pole design, which is slightly in the shape of a cylindrical cup, and a plurality of sensors are combined on the radial inner wall surface of the cylindrical body of the outer rotor 42 A magnet 421. The induction magnet 421 is provided with a support ring 422 on the other side of the radial cylinder of the outer rotor 42 so that the support ring is located between the induction magnet and the circumference of the motor stator 41; the support ring 422 is made of stainless steel, and its diameter and shape are slightly smaller than the outer rotor 42; the bottom of the outer rotor 42 is provided with a plurality of perforations 423, and the plurality of perforations 423 are used for the outer rotor 42 and The nut 3 is locked so that the outer rotor 42 can drive the nut 3 to rotate;

本創作利用上述構件，使該螺帽3穿套螺合於該轉向軸2的螺桿部22，並與該支承法蘭31組成一機構軸承，使該支承法蘭31能夠在該支承法蘭31中轉動；該馬達4的外轉轉子42與該螺帽3鎖結，該馬達定子41則鎖固在該第一殼體11的第一容置空間13中；本創作又使該第一殼體11鎖設在該支承法蘭31一側，而將該馬達4的馬達定子41與外轉轉子42套設組合在該第一容置空間13中；該第二殼體12將該螺帽3容設在該第二容置空間14中，並自該支承法蘭31的另一側予以罩套鎖結；藉此組成本創作的電動助力轉向器，能夠使整體結構更為精簡，該馬達4的動力輸出更有效率地直接驅動該螺帽3，使計算車體轉角或該轉向軸2位置的可靠度提升。This creation uses the above-mentioned components to thread the nut 3 on the screw portion 22 of the steering shaft 2, and form a mechanism bearing with the supporting flange 31, so that the supporting flange 31 can be mounted on the supporting flange 31. The outer rotor 42 of the motor 4 is locked with the nut 3, and the motor stator 41 is locked in the first accommodating space 13 of the first housing 11; this creation makes the first The housing 11 is locked on the side of the supporting flange 31, and the motor stator 41 and the outer rotor 42 of the motor 4 are sleeved and assembled in the first accommodating space 13; the second housing 12 The nut 3 is accommodated in the second accommodating space 14, and is sleeved and locked from the other side of the supporting flange 31; thereby forming the electric power steering gear of this invention, which can make the overall structure more streamlined , The power output of the motor 4 directly drives the nut 3 more efficiently, which improves the reliability of calculating the rotation angle of the vehicle body or the position of the steering shaft 2.

參閱圖3及圖4所示，上述該螺帽3的第一珠溝34與第二珠溝35的形式，係對應配合該滾動件36的大小與形式而定，本創作圖示中所揭示之滾動件36為圓形鋼珠，因此第一珠溝34與第二珠溝35的形式則對應為哥德圓弧形，使滾動件36於第一珠溝34與第二珠溝35之間相對應夾設時，可在珠溝內具有極佳伺服效果的四點接觸，使該螺帽3與該支承法蘭31能通過中介的複數個滾動件36保有確實穩定的滾轉支撐效果。惟圓形鋼珠形式的滾動件36必非絕對限定本創作的應用手段，如滾動件36採用滾柱體形式，該第一珠溝34與該第二珠溝35則改用對應滾柱體的V型珠溝形式，亦可達成確實穩定的滾轉支撐效果。Referring to Figures 3 and 4, the form of the first bead groove 34 and the second bead groove 35 of the nut 3 is determined in accordance with the size and form of the rolling element 36, as disclosed in the illustration of this creation The rolling element 36 is a round steel ball, so the form of the first bead groove 34 and the second bead groove 35 corresponds to the Gothic arc shape, so that the rolling element 36 is located between the first bead groove 34 and the second bead groove 35 When corresponding to the clamping, four-point contact with excellent servo effect can be achieved in the bead groove, so that the nut 3 and the supporting flange 31 can pass through the intermediary plurality of rolling elements 36 to maintain a reliable and stable rolling support effect. However, the rolling element 36 in the form of a circular steel ball must not absolutely limit the application of this creation. For example, the rolling element 36 adopts the form of a roller body, and the first ball groove 34 and the second ball groove 35 use the corresponding roller body instead. The V-shaped bead groove can also achieve a reliable and stable rolling support effect.

參閱圖3及圖5所示，上述該支撐環422的設置，主要係提供該外轉轉子42的感應磁石421一徑向的穩固支撐，使該馬達4在運轉時，該感應磁石421不會因電極與感應磁石421的交互磁吸作用，而與該馬達定子41形成觸接導致磨損的情事產生，此設計與一般的馬達磁石採用膠合黏著的方式，更能大幅提供一極佳的絕對安全性，使馬達的使用壽命能更加提升。 Referring to Figures 3 and 5, the above-mentioned support ring 422 is mainly arranged to provide a radially stable support for the induction magnet 421 of the outer rotating rotor 42 so that the induction magnet 421 does not Due to the mutual magnetic attraction between the electrode and the induction magnet 421, the contact with the motor stator 41 will cause wear. This design and the general motor magnet are glued and bonded, which can greatly provide an excellent absolute Safety, so that the service life of the motor can be further improved.

本創作依前述結構所組成的電動助力轉向器，因該馬達4所採用的轉子形式為外轉子結構，因此於該外轉轉子42上可組設的感應磁石421數量能達到多極數的設計，藉此使該馬達4具有低轉速、高扭矩的特性，致使該螺帽3在直接驅動該轉向軸2作動時，更具有輕巧、高精度靈敏控制的功效。 The electric power steering device composed of the aforementioned structure is used in this invention. Because the rotor type adopted by the motor 4 is an outer rotor structure, the number of induction magnets 421 that can be assembled on the outer rotor 42 can reach multiple poles. The design allows the motor 4 to have the characteristics of low speed and high torque, so that when the nut 3 directly drives the steering shaft 2 to act, it has the effect of light weight, high precision and sensitive control.

綜上所述，本創作電動助力轉向器，已確實使電動助力轉向器的馬達動力可充分運用，使整體動能增進無訛，且功效與設計目的誠然符合，已稱合理進步至明。為此，依法提出新型專利申請，惟懇請鈞局惠予詳審，並賜准專利為禱，至感德便。 In summary, the electric power steering of this creation has indeed made full use of the motor power of the electric power steering, so that the overall kinetic energy is improved without corruption, and the efficiency is indeed in line with the design purpose, which has been said to be reasonable and improved. To this end, I filed an application for a new patent in accordance with the law, but I implore the Jun Bureau for a detailed review and grant the patent as a prayer, which is very convenient.

1:殼體 1: shell

11:第一殼體 11: The first shell

12:第二殼體 12: The second shell

13:第一容置空間 13: The first housing space

14:第二容置空間 14: The second accommodating space

2:轉向軸 2: steering shaft

21:齒條部 21: Rack

22:螺桿部 22: Screw part

3:螺帽 3: nut

31:支承法蘭 31: Support flange

32:通孔 32: Through hole

33:鎖孔 33: keyhole

34:第一珠溝 35:第二珠溝 36:滾動件 4:馬達 41:馬達定子 42:外轉轉子 421:感應磁石 422:支撐環 423:穿孔 34: The First Pearl Ditch 35: Second Pearl Ditch 36: Rolling pieces 4: motor 41: Motor stator 42: Outer rotating rotor 421: Induction Magnet 422: Support Ring 423: Piercing

[圖1]為本創作電動助力轉向器之立體外觀示意圖。 [圖2]為本創作電動助力轉向器之分解立體示意圖。 [圖3]為本創作電動助力轉向器之組合剖面示意圖。 [圖4]為本創作電動助力轉向器中該螺帽局部分解立體示意圖。 [圖5]為本創作電動助力轉向器中該馬達局部分解立體示意圖。 [Figure 1] This is a schematic diagram of the three-dimensional appearance of the electric power steering. [Figure 2] This is an exploded three-dimensional schematic diagram of the electric power steering gear of this creation. [Figure 3] This is a schematic diagram of the combined cross-section of the electric power steering gear created. [Figure 4] This is a partial exploded three-dimensional schematic diagram of the nut in the electric power steering gear of this creation. [Figure 5] This is a partial exploded perspective view of the motor in the electric power steering of this creation.

1:殼體 1: shell

11:第一殼體 11: The first shell

12:第二殼體 12: The second shell

13:第一容置空間 13: The first housing space

14:第二容置空間 14: The second accommodating space

2:轉向軸 2: steering shaft

21:齒條部 21: Rack

22:螺桿部 22: Screw part

3:螺帽 3: nut

31:支承法蘭 31: Support flange

32:通孔 32: Through hole

33:鎖孔 33: keyhole

4:馬達 4: motor

41:馬達定子 41: Motor stator

42:外轉轉子 42: Outer rotating rotor

422:支撐環 422: Support Ring

Claims

一種電動助力轉向器，其包含一殼體、一轉向軸、一螺帽及一馬達，其中：該殼體具有一第一殼體與一第二殼體，該第一殼體與該第二殼體為相連結的管體；該轉向軸能夠軸向往復位移地設置在該殼體內，且其兩端分別從該第一殼體與該第二殼體伸出，該轉向軸的軸體具有一齒條部及一螺桿部；該螺帽組設在該殼體內並螺接該轉向軸的螺桿部，該螺帽通過一支承法蘭組設在該殼體內；其中該支承法蘭形成中央具有一通孔的環體，該通孔的孔壁凹設有一第一珠溝；該螺帽的外環面具有一第二珠溝，該第一珠溝與第二珠溝之間夾設複數個滾動件；該馬達設置於該殼體內以帶動該螺帽轉動，進而驅動該轉向軸於該殼體內軸向往復位移；該馬達具有一中空狀的馬達定子及一外轉轉子，該馬達定子供該轉向軸穿過其中空部位，該外轉轉子呈筒杯形，該外轉轉子的一端與該螺帽相結合而得以驅動該螺帽轉動。 An electric power steering device includes a housing, a steering shaft, a nut and a motor, wherein: The casing has a first casing and a second casing, and the first casing and the second casing are connected pipe bodies; The steering shaft is arranged in the housing such that it can be moved back and forth in the axial direction, and its two ends respectively protrude from the first housing and the second housing. The shaft body of the steering shaft has a rack portion and a screw portion ； The nut is assembled in the housing and is screwed to the screw part of the steering shaft. The nut is assembled in the housing through a supporting flange; wherein the supporting flange forms a ring with a through hole in the center. The wall of the hole is recessed with a first bead groove; the outer ring of the nut has a second bead groove, and a plurality of rolling elements are sandwiched between the first bead groove and the second bead groove; The motor is arranged in the housing to drive the nut to rotate, thereby driving the steering shaft to move axially in the housing; the motor has a hollow motor stator and an outer rotor, and the motor stator provides the steering The shaft passes through the hollow part, the outer rotating rotor is in a cylindrical cup shape, and one end of the outer rotating rotor is combined with the nut to drive the nut to rotate.

如請求項1所述的電動助力轉向器，其中該第一殼體為一多階管徑的管體，該第一殼體較大管徑的一端內部形成一第一容置空間；該第二殼體為一多階管徑的管體，該第二殼體較大管徑的一端內部形成有一第二容置空間；該支承法蘭的環體開設有複數個鎖孔，及該第一殼體鎖設在該支承法蘭一側，該第二殼體鎖設在該支承法蘭的另一側。The electric power steering gear according to claim 1, wherein the first housing is a pipe with a multi-stage pipe diameter, and a first accommodating space is formed inside one end of the first housing with a larger pipe diameter; The second housing is a pipe with a multi-stage pipe diameter, and a second accommodating space is formed inside one end of the second housing with a larger pipe diameter; the ring body of the supporting flange is provided with a plurality of locking holes, and the first A shell is locked on one side of the supporting flange, and the second shell is locked on the other side of the supporting flange.

如請求項2所述的電動助力轉向器，其中該馬達的馬達定子鎖固在該第一殼體的第一容置空間中，及該螺帽容設在第二殼體的第二容置空間中。The electric power steering gear according to claim 2, wherein the motor stator of the motor is locked in the first housing space of the first housing, and the nut is housed in the second housing of the second housing In space.

如請求項1所述的電動助力轉向器，其中該滾動件為滾珠或滾柱其中之一。The electric power steering device according to claim 1, wherein the rolling element is one of a ball or a roller.

如請求項1所述的電動助力轉向器，其中該馬達的外轉轉子於筒身徑向內壁面上結合有複數個感應磁石，該感應磁石相對於該外轉轉子徑向筒身之另側面張設有一支撐環，該支撐環位於該感應磁石與該馬達定子的圓周之間。The electric power steering device according to claim 1, wherein the outer rotating rotor of the motor is combined with a plurality of induction magnets on the radially inner wall surface of the barrel, and the induction magnets are relative to the outer rotating rotor of the radial barrel. A support ring is stretched on the other side surface, and the support ring is located between the induction magnet and the circumference of the motor stator.

如請求項5所述的電動助力轉向器，其中該外轉轉子的筒杯形的底部設有複數個穿孔供螺絲穿設以與該螺帽相鎖合。The electric power steering gear according to claim 5, wherein the cylindrical cup-shaped bottom of the outer rotor is provided with a plurality of perforations for screws to pass through to lock with the nut.

如請求項5所述的電動助力轉向器，其中該支撐環為不鏽鋼材質，其直徑及形體小於該外轉轉子。The electric power steering gear according to claim 5, wherein the support ring is made of stainless steel, and its diameter and shape are smaller than the outer rotor.