JP2018016183A - Electric booster - Google Patents

Electric booster Download PDF

Info

Publication number
JP2018016183A
JP2018016183A JP2016147502A JP2016147502A JP2018016183A JP 2018016183 A JP2018016183 A JP 2018016183A JP 2016147502 A JP2016147502 A JP 2016147502A JP 2016147502 A JP2016147502 A JP 2016147502A JP 2018016183 A JP2018016183 A JP 2018016183A
Authority
JP
Japan
Prior art keywords
assist member
input
assist
magnet holder
housing
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.)
Granted
Application number
JP2016147502A
Other languages
Japanese (ja)
Other versions
JP6698463B2 (en
Inventor
憲久 深山
Norihisa Miyama
憲久 深山
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Astemo Ltd
Original Assignee
Hitachi Automotive Systems Ltd
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 by Hitachi Automotive Systems Ltd filed Critical Hitachi Automotive Systems Ltd
Priority to JP2016147502A priority Critical patent/JP6698463B2/en
Publication of JP2018016183A publication Critical patent/JP2018016183A/en
Application granted granted Critical
Publication of JP6698463B2 publication Critical patent/JP6698463B2/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Landscapes

  • Braking Systems And Boosters (AREA)
  • Braking Elements And Transmission Devices (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide an electric booster that shortens the length of an input member along an axial direction and facilitates assembly of a stroke detecting means thereof.SOLUTION: An electric booster 1 has respective magnet members 67, 67 arranged on an assist member 4 and has a Hall IC chip 80 arranged on the rear side of a rear housing 10 for housing an electric motor 6, and consequently, the length of an input rod 2 along the axial direction can be shortened as compared with the conventional device. Further, a magnet holder 70 is provided with restriction pieces 72 for restricting separation of the magnet holder 70 from a housing recess 47 by interference with protruding pieces 51 of the assist member 4, and a first compression coil spring 65 is provided for energizing the magnet holder 70 to a position where the restriction pieces 72 match the protruding pieces 51 of the assist member 4, so that the magnet holder 70 can be easily assembled without separating from the housing recess 47 of the assist member 4.SELECTED DRAWING: Figure 2

Description

本発明は、自動車等の車両のブレーキペダルの操作量を検出してマスタシリンダでブレーキ液圧を発生させる電動倍力装置に関するものである。   The present invention relates to an electric booster that detects an operation amount of a brake pedal of a vehicle such as an automobile and generates a brake fluid pressure by a master cylinder.

従来、電動倍力装置には、ブレーキペダルの操作量を検出するストローク検出手段が備えられている。該ストローク検出手段の従来技術として、特許文献１には、インプットロッドに設けられた複数の磁性体の磁束密度を、ケーシングのカバーに設けられたホールセンサユニットで検出することで、インプットロッドのストローク量を検出するストローク検出装置が開示されている。   2. Description of the Related Art Conventionally, an electric booster is provided with a stroke detection unit that detects an operation amount of a brake pedal. As a prior art of the stroke detecting means, Patent Document 1 discloses a stroke of an input rod by detecting magnetic flux densities of a plurality of magnetic bodies provided on an input rod by a Hall sensor unit provided on a casing cover. A stroke detection device for detecting a quantity is disclosed.

特開２０１５−２１７４５号公報JP 2015-21745 A

しかしながら、特許文献１に係るストローク検出装置では、インプットロッドに、その軸方向に沿って間隔を置いて複数の磁性体が配置され、ケーシングの最も後方に位置するカバーにホールセンサユニットが配置されており、この構成を採用すると、電動倍力装置の、インプットロッド（入力部材）の軸方向に沿う長さが長くなる虞がある。
また、近年、電動倍力装置の製造工程に関して、特に、ストローク検出手段の組付作業の効率化が望まれている。 However, in the stroke detection device according to Patent Document 1, a plurality of magnetic bodies are arranged on the input rod at intervals along the axial direction, and the hall sensor unit is arranged on the cover located at the rearmost side of the casing. And when this structure is employ | adopted, there exists a possibility that the length along the axial direction of an input rod (input member) of an electric booster may become long.
Further, in recent years, regarding the manufacturing process of the electric booster, in particular, it is desired to improve the efficiency of the assembly work of the stroke detection means.

本発明は、上記の点に鑑みてなされたものであり、入力部材の軸方向に沿う長さを短縮すると共に、そのストローク検出手段の組み付けを容易とする電動倍力装置を提供することを目的とする。   The present invention has been made in view of the above points, and an object thereof is to provide an electric booster that shortens the length of the input member along the axial direction and facilitates the assembly of the stroke detection means. And

上記課題を解決するための手段として、本発明の電動倍力装置は、ブレーキペダルの操作に伴って移動して、マスタシリンダのピストンを推進する入力部材と、該入力部材の移動量を検出するストローク検出手段と、該ストローク検出手段からの信号に基づいて電動モータが回転駆動されることで直動して、マスタシリンダのピストンを推進するアシスト部材と、該アシスト部材が直動可能に配置されるハウジングと、を備えた電動倍力装置において、
前記ストローク検出手段は、磁石部材を保持して前記アシスト部材と共に移動する磁石ホルダと、前記ハウジングに固定される磁気センサと、を備え、
前記アシスト部材は、前記入力部材が挿通されるように筒状に形成され、前記アシスト部材は、その外周面に軸方向に沿って設けられる収容凹部と、該収容凹部の周辺から該収容凹部の上方に向かって突設される突起片と、その一端内周面から軸方向に沿って形成される案内溝と、該案内溝と連続するように前記収容凹部の底部を軸方向の所定範囲径方向に貫通するスリットと、を備え、
前記入力部材には、その外周面から径方向外方に延び、前記案内溝及び前記スリットに挿通可能なピン部材が設けられ、前記磁石ホルダは、前記アシスト部材内に挿入された前記入力部材から前記収容凹部内に前記スリットを介して突出した前記ピン部材に接続されると共に、前記アシスト部材の収容凹部に、前記入力部材の移動方向に沿って移動可能に収容され、前記磁石ホルダには、前記アシスト部材に設けた突起片との干渉により前記磁石ホルダの前記収容凹部からの離脱を規制する規制片が設けられ、前記入力部材と前記アシスト部材との間に、前記磁石ホルダを、その規制片が前記アシスト部材の突起片に前記入力部材の移動方向に沿って一致する位置に付勢する付勢部材が設けられる As means for solving the above problems, an electric booster according to the present invention detects an input member that moves in accordance with an operation of a brake pedal and propels a piston of a master cylinder, and a movement amount of the input member. Stroke detecting means, an assist member that drives the piston of the master cylinder in direct motion by rotationally driving the electric motor based on a signal from the stroke detecting means, and the assist member is arranged to be linearly movable. An electric booster comprising:
The stroke detection means includes a magnet holder that holds a magnet member and moves with the assist member, and a magnetic sensor fixed to the housing.
The assist member is formed in a cylindrical shape so that the input member can be inserted therethrough, and the assist member includes an accommodation recess provided along an axial direction on an outer peripheral surface thereof, and a periphery of the accommodation recess from the periphery of the accommodation recess. A projecting piece projecting upward, a guide groove formed along the axial direction from the inner peripheral surface of one end thereof, and a bottom portion of the receiving recess in a predetermined range in the axial direction so as to be continuous with the guide groove A slit penetrating in the direction,
The input member is provided with a pin member extending radially outward from an outer peripheral surface thereof and capable of being inserted into the guide groove and the slit, and the magnet holder is provided from the input member inserted into the assist member. It is connected to the pin member protruding through the slit in the accommodating recess, and is accommodated in the accommodating recess of the assist member so as to be movable along the moving direction of the input member. A restricting piece is provided for restricting the magnet holder from detaching from the receiving recess due to interference with the protruding piece provided on the assist member, and the magnet holder is restricted between the input member and the assist member. An urging member is provided that urges the piece to a position where the protruding member of the assist member coincides with the moving direction of the input member

本発明に係る電動倍力装置では、該電動倍力装置の、入力部材の軸方向に沿う長さを短縮することができ、また、ストローク検出手段の組付作業を容易に行うことができる。   In the electric booster according to the present invention, the length of the electric booster along the axial direction of the input member can be shortened, and the assembly operation of the stroke detection means can be easily performed.

本実施の形態に係る電動倍力装置の断面図。Sectional drawing of the electric booster which concerns on this Embodiment. 図１の要部断面図。FIG. 2 is a main part sectional view of FIG. 1. アシスト部材内に配置される入力プランジャ及び入力ロッドの部分組立体の分解斜視図。The exploded perspective view of the subassembly of the input plunger and input rod which are arrange | positioned in an assist member.

以下、実施の形態を図１〜図３に基づいて詳細に説明する。
本実施の形態に係る電動倍力装置１は、図１に示すように、大略、入力ロッド２、入力プランジャ３、アシスト部材４、回転直動変換機構５、電動モータ６、ストローク検出手段７及びハウジング８を備えている。入力部材としての入力ロッド２及び入力プランジャ３は、ブレーキペダル（図示略）の操作に応じてハウジング８内を軸方向に移動するものである。ストローク検出手段７は、入力ロッド２及び入力プランジャ３のストローク量を検出するものである。回転直動変換機構５は、ストローク検出手段７からの検出信号に基づく電動モータ６の作動により、アシスト部材４を軸方向に移動（直動）させるものである。なお、本実施の形態に係る電動倍力装置１を以下に詳しく説明するが、図１及び図３において、左側を前側（車両前方）、右側を後側（車両後側）として説明する。 Hereinafter, embodiments will be described in detail with reference to FIGS.
As shown in FIG. 1, the electric booster 1 according to the present embodiment generally includes an input rod 2, an input plunger 3, an assist member 4, a rotation / linear motion conversion mechanism 5, an electric motor 6, a stroke detection means 7, and A housing 8 is provided. The input rod 2 and the input plunger 3 as input members move in the housing 8 in the axial direction in response to an operation of a brake pedal (not shown). The stroke detection means 7 detects the stroke amounts of the input rod 2 and the input plunger 3. The rotation / linear motion conversion mechanism 5 moves (directly moves) the assist member 4 in the axial direction by the operation of the electric motor 6 based on the detection signal from the stroke detection means 7. In addition, although the electric booster 1 which concerns on this Embodiment is demonstrated in detail below, in FIG.1 and FIG.3, the left side is demonstrated as the front side (vehicle front), and the right side is demonstrated as the rear side (vehicle rear side).

図１に示すように、電動倍力装置１は、ハウジング８の前側にマスタシリンダ（図示略）を連結した構造を有している。該マスタシリンダ内を軸方向に移動するピストン（図示略）に、電動倍力装置１が連結される。該マスタシリンダ内をピストンが軸方向に移動することで、該マスタシリンダ内の液圧室にブレーキ液圧が発生する。なお、マスタシリンダ内の液圧室は、各車輪（図示略）のホイールシリンダ（図示略）に連通しており、マスタシリンダにより発生されるブレーキ液の液圧を各車輪のホイールシリンダに伝達して、各車輪の回転に対してそれぞれ制動力を発生させて、車両に制動力を発生させる。   As shown in FIG. 1, the electric booster 1 has a structure in which a master cylinder (not shown) is connected to the front side of a housing 8. The electric booster 1 is connected to a piston (not shown) that moves in the master cylinder in the axial direction. As the piston moves in the axial direction in the master cylinder, a brake fluid pressure is generated in the fluid pressure chamber in the master cylinder. The hydraulic chamber in the master cylinder communicates with a wheel cylinder (not shown) of each wheel (not shown), and transmits the brake fluid pressure generated by the master cylinder to the wheel cylinder of each wheel. Thus, a braking force is generated for each wheel rotation to cause the vehicle to generate a braking force.

図１に示すように、ハウジング８は、フロントハウジング９と、フロントハウジング９の後端開口を閉塞するリアハウジング１０と、を備えている。ハウジング８内に、電動モータ６及び回転直動変換機構５等が収容される。リアハウジング１０には、マスタシリンダと同心状となる円筒部１５が後方に向かって突設されている。そして、電動倍力装置１は、入力ロッド２を車両のエンジンルームと車室との隔壁であるダッシュパネル（図示略）から突出させて車室内に臨ませた状態で、エンジンルーム内に配置してダッシュパネルに固定されている。   As shown in FIG. 1, the housing 8 includes a front housing 9 and a rear housing 10 that closes a rear end opening of the front housing 9. The electric motor 6 and the rotation / linear motion conversion mechanism 5 are accommodated in the housing 8. A cylindrical portion 15 that is concentric with the master cylinder protrudes rearward from the rear housing 10. The electric booster 1 is disposed in the engine room with the input rod 2 protruding from a dash panel (not shown) that is a partition wall between the engine room and the vehicle compartment of the vehicle and facing the vehicle compartment. It is fixed to the dash panel.

図１〜図３に示すように、入力ロッド２は、リアハウジング１０の円筒部１５内に配置され、その前端が入力プランジャ３に連結される。入力ロッド２の後端側が円筒部１５から外部に延出している。入力ロッド２は、前方に位置する小径ロッド部１７と、該小径ロッド部１７から後方に延びる大径ロッド部１８とからなる段付き形状に形成される。小径ロッド部１７と大径ロッド部１８との間に環状段差部１９が設けられる。小径ロッド部１７は前方に向かって次第に縮径されている。小径ロッド部１７の前端にはボールジョイント２０が設けられる。大径ロッド部１８の後端部がクレビス（図示略）を介してブレーキペダルに連結される。これにより、ブレーキペダルの操作により入力ロッド２が軸方向に沿って移動する。入力ロッド２の前端のボールジョイント２０が、入力プランジャ３の後端に連結される。   As shown in FIGS. 1 to 3, the input rod 2 is disposed in the cylindrical portion 15 of the rear housing 10, and its front end is connected to the input plunger 3. The rear end side of the input rod 2 extends from the cylindrical portion 15 to the outside. The input rod 2 is formed in a stepped shape including a small-diameter rod portion 17 positioned in front and a large-diameter rod portion 18 extending rearward from the small-diameter rod portion 17. An annular step portion 19 is provided between the small diameter rod portion 17 and the large diameter rod portion 18. The small-diameter rod portion 17 is gradually reduced in diameter toward the front. A ball joint 20 is provided at the front end of the small diameter rod portion 17. The rear end portion of the large-diameter rod portion 18 is connected to the brake pedal via a clevis (not shown). Thereby, the input rod 2 moves along an axial direction by operation of a brake pedal. The ball joint 20 at the front end of the input rod 2 is connected to the rear end of the input plunger 3.

入力プランジャ３は、全体として棒状に形成されており、主ロッド部２４と、主ロッド部２４から前方に小径部２５を介して設けられる押圧部２６と、主ロッド部２４から後方に延びる案内部２７と、から構成される。押圧部２６は、主ロッド部２４の外径よりも小径に形成される。案内部２７は、主ロッド部２４の外径よりも大径に形成される。案内部２７の外周面には、カシメ用工具を挿入するための環状凹部２９が形成される。案内部２７の後端面で径方向中央部に、入力ロッド２のボールジョイント２０が連結される球状凹部３０が形成される。主ロッド部２４には径方向外方に向かってピン部材３３が突設される。該ピン部材３３は、案内部２７寄りに設けられる。主ロッド部２４の外周面には、小径部２５に近接する位置に環状溝部３５が形成される。該環状溝部３５の軸方向に沿う幅長は、後述するストップキー５５の一対の挟持片５６、５６の幅長と略一致する。   The input plunger 3 is formed in a rod shape as a whole, and includes a main rod portion 24, a pressing portion 26 provided forward from the main rod portion 24 via a small diameter portion 25, and a guide portion extending rearward from the main rod portion 24. 27. The pressing portion 26 is formed with a smaller diameter than the outer diameter of the main rod portion 24. The guide portion 27 is formed with a larger diameter than the outer diameter of the main rod portion 24. An annular recess 29 for inserting a caulking tool is formed on the outer peripheral surface of the guide portion 27. A spherical concave portion 30 to which the ball joint 20 of the input rod 2 is connected is formed in the central portion in the radial direction on the rear end surface of the guide portion 27. A pin member 33 projects from the main rod portion 24 outward in the radial direction. The pin member 33 is provided closer to the guide portion 27. An annular groove portion 35 is formed on the outer peripheral surface of the main rod portion 24 at a position close to the small diameter portion 25. The width of the annular groove 35 along the axial direction is substantially the same as the width of a pair of sandwiching pieces 56 and 56 of a stop key 55 described later.

入力プランジャ３はアシスト部材４の内部に配置される。該アシスト部材４は、全体として円筒状に形成される。該アシスト部材４は、円筒状に延びる本体部３７と、該本体部３７の前部外周面から径方向外方に突設される環状突設部３８と、を備えている。本体部３７は、前端に開口される小径開口部３９と、該小径開口部３９よりも大径で該小径開口部３９よりも後側に開口される中間径開口部４０と、該中間径開口部４０よりも大径で該中間径開口部４０よりも後側に開口される大径開口部４１とを備えている。小径開口部３９の内周面と中間径開口部４０の内周面との間にストッパ面４２が形成される。小径開口部３９の内径は、入力プランジャ３の押圧部２６の外径に略一致する。中間径開口部４０の内径は、入力プランジャ３の主ロッド部２４の外径よりも大径に形成される。大径開口部４１の内径は、入力プランジャ３の案内部２７の外径と略一致する。   The input plunger 3 is disposed inside the assist member 4. The assist member 4 is formed in a cylindrical shape as a whole. The assist member 4 includes a main body portion 37 that extends in a cylindrical shape, and an annular projecting portion 38 that projects radially outward from the front outer peripheral surface of the main body portion 37. The main body 37 includes a small-diameter opening 39 that is opened at the front end, an intermediate-diameter opening 40 that is larger in diameter than the small-diameter opening 39 and is opened to the rear side of the small-diameter opening 39, and the intermediate-diameter opening. A large-diameter opening 41 having a diameter larger than that of the portion 40 and opened to the rear side of the intermediate-diameter opening 40. A stopper surface 42 is formed between the inner peripheral surface of the small diameter opening 39 and the inner peripheral surface of the intermediate diameter opening 40. The inner diameter of the small diameter opening 39 substantially matches the outer diameter of the pressing portion 26 of the input plunger 3. The inner diameter of the intermediate diameter opening 40 is formed larger than the outer diameter of the main rod 24 of the input plunger 3. The inner diameter of the large-diameter opening 41 substantially matches the outer diameter of the guide portion 27 of the input plunger 3.

本体部３７の外径は、円筒部１５の内径に略一致している。本体部３７の外周面には、環状突設部３８から後端までの範囲に第１平面部４５が形成される。一方、本体部３７の外周面で、第１平面部４５の径方向反対側には、環状突設部３８から後側の所定範囲に第２平面部４６が形成される。該第２平面部４６には、平面視略矩形状の収容凹部４７が形成される。収容凹部４７の長手方向が、本体部３７の軸方向に一致する。本体部３７の内周面には、その後端から第２平面部４６までの軸方向の範囲に案内溝４８が形成される。該案内溝４８はその幅がピン部材３３の外径より大きく形成される。該案内溝４８から連続するように、第２平面部４６から収容凹部４７に向かう軸方向の所定範囲に径方向に貫通するスリット４９が形成される。該スリット４９は、収容凹部４７に臨む。スリット４９の開口幅は、ピン部材３３の外径より大きく形成される。第２平面部４６には、収容凹部４７の上方に向かって突設される突起片５１、５１が複数形成される。突起片５１、５１は、収容凹部４７に向かって互い対向するように一対設けられ、一対の突起片５１、５１が、軸方向に間隔を置いて複数組設けられる。本実施形態では、一対の突起片５１、５１が軸方向に沿って２組設けられる。   The outer diameter of the main body portion 37 substantially matches the inner diameter of the cylindrical portion 15. A first flat portion 45 is formed on the outer peripheral surface of the main body portion 37 in a range from the annular projecting portion 38 to the rear end. On the other hand, on the outer peripheral surface of the main body portion 37, a second flat portion 46 is formed in a predetermined range on the rear side from the annular projecting portion 38 on the opposite side of the first flat portion 45 in the radial direction. The second flat portion 46 is formed with a housing recess 47 having a substantially rectangular shape in plan view. The longitudinal direction of the housing recess 47 coincides with the axial direction of the main body 37. A guide groove 48 is formed on the inner peripheral surface of the main body portion 37 in the axial range from the rear end to the second flat portion 46. The width of the guide groove 48 is larger than the outer diameter of the pin member 33. A slit 49 penetrating in the radial direction is formed in a predetermined range in the axial direction from the second flat portion 46 to the accommodating recess 47 so as to be continuous from the guide groove 48. The slit 49 faces the receiving recess 47. The opening width of the slit 49 is formed larger than the outer diameter of the pin member 33. A plurality of projecting pieces 51, 51 are formed on the second plane portion 46 so as to project upward from the housing recess 47. A pair of projection pieces 51 and 51 are provided so as to face each other toward the housing recess 47, and a plurality of pairs of the projection pieces 51 and 51 are provided at intervals in the axial direction. In this embodiment, two sets of a pair of protrusion pieces 51 and 51 are provided along the axial direction.

アシスト部材４の内周面で、案内溝４８と対向する位置、すなわち、第１平面部４５が形成される側に、溝部５２が軸方向に沿って所定範囲形成される。この溝部５２の前端は、収容凹部４７の底部に設けたスリット４９の前端に一致する。また、本体部３７の、環状突設部３８から後方で該環状突設部３８に近接する位置に径方向に貫通する貫通孔部５３が形成される。該貫通孔部５３は、第１平面部４５と第２平面部４６との間に周方向に沿って形成される。貫通孔部５３の軸方向に沿う幅長は、後述するストップキー５５の一対の挟持片５６、５６の幅長より大きく形成される。貫通孔部５３は、アシスト部材４内に入力プランジャ３を組付けた時、入力プランジャ３の環状溝部３５と軸方向に沿う位置が略一致する。なお、図１に仮想線で示すように、ピン部材３３を主ロッド部２４から径方向両側に突出させると、ピン部材２３が溝部５２にも挿通するようになり、入力プランジャ３とアシスト部材４との回転防止機能を強化することができる。また、スリット４９とピン部材３３との間でも回転防止を図ることができる。   A groove 52 is formed in a predetermined range along the axial direction on the inner peripheral surface of the assist member 4 at a position facing the guide groove 48, that is, on the side where the first flat surface 45 is formed. The front end of the groove 52 coincides with the front end of the slit 49 provided at the bottom of the housing recess 47. Further, a through-hole portion 53 penetrating in the radial direction is formed at a position of the main body portion 37 at a position close to the annular projecting portion 38 behind the annular projecting portion 38. The through-hole portion 53 is formed along the circumferential direction between the first plane portion 45 and the second plane portion 46. The width of the through hole 53 along the axial direction is formed larger than the width of a pair of holding pieces 56 and 56 of a stop key 55 described later. When the input plunger 3 is assembled in the assist member 4, the through-hole portion 53 substantially coincides with the annular groove portion 35 of the input plunger 3 along the axial direction. As shown in phantom lines in FIG. 1, when the pin member 33 is protruded from the main rod portion 24 in both radial directions, the pin member 23 is also inserted into the groove portion 52, and the input plunger 3 and the assist member 4. The anti-rotation function can be strengthened. Further, it is possible to prevent rotation between the slit 49 and the pin member 33.

アシスト部材４の貫通孔部５３と、入力プランジャ３の環状溝部３５との間にストップキー５５が配置される。ストップキー５５は、一対の挟持片５６、５６と、一対の挟持片５６、５６の一端部を連結する連結部５７と、を備えている。一対の挟持片５６、５６の対向する面には、入力プランジャ３の主ロッド部２４の環状溝部３５に沿う円弧状凹部５８、５８が形成される。そして、アシスト部材４内への入力プランジャ３の組付時、ストップキー５５の一対の挟持片５６、５６をアシスト部材４の貫通孔部５３に挿入すると、一対の挟持片５６、５６の円弧状凹部５８、５８が入力プランジャ３の環状溝部３５に嵌合しつつ、一対の挟持片５６、５６がアシスト部材４の貫通孔部５３に軸方向にクリアランスを有して遊嵌される。このストップキー５５により、アシスト部材４と入力プランジャ３との軸方向に沿う相対移動量が制限される。言い換えれば、アシスト部材４と入力プランジャ３とは、ストップキー５５と貫通孔部５３との間のクリアランス相当分だけ軸方向に沿う相対移動が許容される。   A stop key 55 is disposed between the through-hole portion 53 of the assist member 4 and the annular groove portion 35 of the input plunger 3. The stop key 55 includes a pair of holding pieces 56 and 56 and a connecting portion 57 that connects one end portions of the pair of holding pieces 56 and 56. Arc-shaped concave portions 58 and 58 along the annular groove portion 35 of the main rod portion 24 of the input plunger 3 are formed on the opposing surfaces of the pair of sandwiching pieces 56 and 56. When the pair of sandwiching pieces 56 and 56 of the stop key 55 are inserted into the through-hole portion 53 of the assist member 4 when the input plunger 3 is assembled into the assist member 4, the arc shape of the pair of sandwiching pieces 56 and 56 is obtained. While the recesses 58 and 58 are fitted in the annular groove 35 of the input plunger 3, the pair of sandwiching pieces 56 and 56 are loosely fitted in the through hole 53 of the assist member 4 with a clearance in the axial direction. The stop key 55 limits the relative movement amount of the assist member 4 and the input plunger 3 along the axial direction. In other words, the assist member 4 and the input plunger 3 are allowed to move in the axial direction by an amount corresponding to the clearance between the stop key 55 and the through hole 53.

入力プランジャ３の案内部２７の後端面と、アシスト部材４の後端面との間には円筒状の第１バネ受部材６０が配置される。該第１バネ受部材６０は、アシスト部材４の大径開口部４１の内周面に当接する第１円筒状部６１と、該第１円筒状部６１の前端から径方向内方に環状に突設する第１内側支持部６２と、第１円筒状部６１の後端から径方向外方に環状に突設する第１外側支持部６３と、を備えている。第１バネ受部材６０の第１内側支持部６２は、入力プランジャ３の案内部２７の後端面と対向する。一方、第１バネ受部材６０の第１外側支持部６３は、アシスト部材４の後端面に当接する。   A cylindrical first spring receiving member 60 is disposed between the rear end surface of the guide portion 27 of the input plunger 3 and the rear end surface of the assist member 4. The first spring receiving member 60 is annularly formed radially inward from the front end of the first cylindrical portion 61 and a first cylindrical portion 61 that contacts the inner peripheral surface of the large-diameter opening 41 of the assist member 4. A first inner support portion 62 that protrudes and a first outer support portion 63 that protrudes radially outward from the rear end of the first cylindrical portion 61 are provided. The first inner support portion 62 of the first spring receiving member 60 faces the rear end surface of the guide portion 27 of the input plunger 3. On the other hand, the first outer support portion 63 of the first spring receiving member 60 contacts the rear end surface of the assist member 4.

第１バネ受部材６０の第１内側支持部６２と、入力ロッド２の環状段差部１９との間には、第１圧縮コイルバネ６５が配置される。この結果、第１圧縮コイルバネ６５は、アシスト部材４と入力ロッド２との間に配置されることになる。すなわち、該第１圧縮コイルバネ６５は、その付勢力により、アシスト部材４と入力ロッド２とを互いに離間させる方向に付勢する。第１圧縮コイルバネ６５は、その前端から後端に向かって次第に縮径される円錐台状に形成される。第１圧縮コイルバネ６５の前端の外径が第１バネ受部材６０の第１円筒状部６１の内径に一致して、その後端の外径が入力ロッド２の大径ロッド部１８の外径に一致する。   A first compression coil spring 65 is disposed between the first inner support portion 62 of the first spring receiving member 60 and the annular step portion 19 of the input rod 2. As a result, the first compression coil spring 65 is disposed between the assist member 4 and the input rod 2. That is, the first compression coil spring 65 urges the assist member 4 and the input rod 2 in a direction in which they are separated from each other by the urging force. The first compression coil spring 65 is formed in a truncated cone shape whose diameter is gradually reduced from the front end toward the rear end. The outer diameter of the front end of the first compression coil spring 65 coincides with the inner diameter of the first cylindrical portion 61 of the first spring receiving member 60, and the outer diameter of the rear end thereof is the outer diameter of the large-diameter rod portion 18 of the input rod 2. Match.

入力プランジャ３の押圧部２６を含むアシスト部材４の前端面には、リアクションディスク８４が当接するように配置される。該リアクションディスク８４は、ゴム等の弾性体で構成される。出力ロッド８６は、ロッド部８７と、該ロッド部８７の後端に一体的に設けられるカップ部８８と、から構成される。該出力ロッド８６のカップ部８８内に、リアクションディスク８４、及び入力プランジャ３の押圧部２６を含むアシスト部材４の前端部が配置される。カップ部８８の外径は、アシスト部材４の環状突設部３８の外径よりも小径に形成される。出力ロッド８６のロッド部８７がマスタシリンダ内のピストンに連結される。   The reaction disk 84 is disposed so as to abut on the front end surface of the assist member 4 including the pressing portion 26 of the input plunger 3. The reaction disk 84 is made of an elastic body such as rubber. The output rod 86 includes a rod portion 87 and a cup portion 88 that is integrally provided at the rear end of the rod portion 87. A front end portion of the assist member 4 including the reaction disk 84 and the pressing portion 26 of the input plunger 3 is disposed in the cup portion 88 of the output rod 86. The outer diameter of the cup portion 88 is formed smaller than the outer diameter of the annular projecting portion 38 of the assist member 4. The rod portion 87 of the output rod 86 is connected to the piston in the master cylinder.

アシスト部材４の環状突設部３８の後端面に、推力伝達部材９０が当接される。該推力伝達部材９０は、アシスト部材４の軸方向に沿って移動可能であり、回転直動変換機構５の直動部材（図示略）からの直動推力が伝達される。推力伝達部材９０は、その外周面が後方に向かって縮径され、その内周面が後方に向かって階段状に拡径される円筒状に形成される。推力伝達部材９０には、その後端に内方に向かって環状に突設される推力伝達部９１が形成される。推力伝達部９１の前面が、アシスト部材４の環状突設部３８の後面に当接される。   The thrust transmission member 90 is brought into contact with the rear end surface of the annular projecting portion 38 of the assist member 4. The thrust transmission member 90 is movable along the axial direction of the assist member 4, and a linear motion thrust is transmitted from a linear motion member (not shown) of the rotation / linear motion conversion mechanism 5. The thrust transmission member 90 is formed in a cylindrical shape whose outer peripheral surface is reduced in diameter toward the rear and whose inner peripheral surface is increased in a step shape toward the rear. The thrust transmission member 90 is formed with a thrust transmission portion 91 projecting in an annular shape inward at the rear end thereof. The front surface of the thrust transmission portion 91 is brought into contact with the rear surface of the annular projecting portion 38 of the assist member 4.

推力伝達部９１の径方向内側の開口部は、アシスト部材４の第１平面部４５に当接する内壁面を有している。推力伝達部材９０の内壁面には、環状に延びるバネ受部９２が形成される。この推力伝達部材９０のバネ受部９２と、ハウジング８のフロントハウジング９の後端面との間に第２圧縮コイルバネ９４が配置される。該第２圧縮コイルバネ９４の付勢力により、推力伝達部材９０を後方に向かって付勢している。なお、推力伝達部材９０の推力伝達部９１が、リアハウジング１０の規制面１１に当接することで、推力伝達部材９０の後退限位置が設定される。   The opening portion on the radially inner side of the thrust transmission portion 91 has an inner wall surface that comes into contact with the first flat portion 45 of the assist member 4. On the inner wall surface of the thrust transmission member 90, an annular spring receiving portion 92 is formed. A second compression coil spring 94 is disposed between the spring receiving portion 92 of the thrust transmission member 90 and the rear end surface of the front housing 9 of the housing 8. The thrust transmission member 90 is urged rearward by the urging force of the second compression coil spring 94. In addition, when the thrust transmission portion 91 of the thrust transmission member 90 abuts on the restriction surface 11 of the rear housing 10, the backward limit position of the thrust transmission member 90 is set.

出力ロッド８６のカップ部８８を覆うように第２バネ受部材９５が配置される。該第２バネ受部材９５は、出力ロッド８６のカップ部８８より大径の内径を有する第２円筒状部９６と、該第２円筒状部９６の前端から径方向内方に環状に突設する第２内側支持部９７と、第２円筒状部９６の後端から径方向外方に環状に突設する第２外側支持部９８と、を備えている。第２内側支持部９７の内側に出力ロッド８６のロッド部８７が挿通されている。また第２バネ受部材９５の第２外側支持部９８の後面が、アシスト部材４の環状突設部３８に当接されている。第２バネ受部材９５の第２外側支持部９８と、ハウジング８のフロントハウジング９の段差部１２との間に第３圧縮コイルバネ１００が配置される。該第３圧縮コイルバネ１００の付勢力により、第２バネ受部材９５を介してアシスト部材４を後方に向かって付勢している。   A second spring receiving member 95 is disposed so as to cover the cup portion 88 of the output rod 86. The second spring receiving member 95 has a second cylindrical portion 96 having an inner diameter larger than that of the cup portion 88 of the output rod 86, and an annular projecting shape radially inward from the front end of the second cylindrical portion 96. A second inner support portion 97 and a second outer support portion 98 projecting radially outward from the rear end of the second cylindrical portion 96. The rod portion 87 of the output rod 86 is inserted inside the second inner support portion 97. The rear surface of the second outer support portion 98 of the second spring receiving member 95 is in contact with the annular projecting portion 38 of the assist member 4. The third compression coil spring 100 is disposed between the second outer support portion 98 of the second spring receiving member 95 and the step portion 12 of the front housing 9 of the housing 8. The biasing force of the third compression coil spring 100 biases the assist member 4 backward via the second spring receiving member 95.

ストローク検出手段７は、ブレーキペダルの操作量（ストローク量）に基づく、入力ロッド２及び入力プランジャ３のストローク量を検出するものである。ストローク検出手段７は、複数の磁石部材６７、６７と、ホールセンサユニット６８と、を備えている。複数の磁石部材６７、６７は、磁石ホルダ７０に保持される。各磁石部材６７、６７は直方体状に形成される。   The stroke detecting means 7 detects the stroke amount of the input rod 2 and the input plunger 3 based on the operation amount (stroke amount) of the brake pedal. The stroke detection means 7 includes a plurality of magnet members 67 and 67 and a hall sensor unit 68. The plurality of magnet members 67 and 67 are held by the magnet holder 70. Each magnet member 67, 67 is formed in a rectangular parallelepiped shape.

磁石ホルダ７０は、略直方体からなるホルダ本体部７１と、ホルダ本体部７１に設けられ、アシスト部材４の各突起片５１、５１と係合してホルダ本体部７１のアシスト部材４からの離脱を規制する複数の規制片７２、７２と、を備えている。ホルダ本体部７１の長手方向の全長は、アシスト部材４の収容凹部４７の長手方向の全長よりも短く設定される。一方、ホルダ本体部７１の短手方向の全長は、アシスト部材４の収容凹部４７の短手方向の全長と略同一である。ホルダ本体部７１は、アシスト部材４の収容凹部４７内に、アシスト部材４に対して相対移動可能に保持される。その相対移動量は、ストップキー５５の一対の挟持部材５６とアシスト部材４の貫通孔部５３との間のクリアランス相当分となる。   The magnet holder 70 is provided on the holder main body 71 having a substantially rectangular parallelepiped shape and the holder main body 71. The magnet holder 70 engages with the protruding pieces 51, 51 of the assist member 4 to release the holder main body 71 from the assist member 4. And a plurality of restricting pieces 72 and 72 for restricting. The overall length in the longitudinal direction of the holder main body 71 is set to be shorter than the overall length in the longitudinal direction of the housing recess 47 of the assist member 4. On the other hand, the overall length in the short direction of the holder main body 71 is substantially the same as the overall length in the short direction of the housing recess 47 of the assist member 4. The holder main body 71 is held in the accommodating recess 47 of the assist member 4 so as to be movable relative to the assist member 4. The relative movement amount is equivalent to the clearance between the pair of clamping members 56 of the stop key 55 and the through hole 53 of the assist member 4.

ホルダ本体部７１の、アシスト部材４の径方向外方に指向する端面７３は、アシスト部材４の本体部３７の外周面に一致するように湾曲面７３に形成される。湾曲面７３の頂部には、長手方向（アシスト部材４の軸方向）の全域に亘って平面部７４が形成される。湾曲面７３には、長手方向に間隔を置いて複数の保持凹部７５、７５が形成される。本実施形態では、保持凹部７５、７５は、ホルダ本体部７１の長手方向両端部と、長手方向中央部との３箇所に形成される。各保持凹部７５、７５に磁石部材６７、６７がそれぞれ配置される。各保持凹部７５に磁石部材６７を配置した後、蓋体７８にて保持凹部７５が閉塞される。各保持凹部７５、７５間には、空間凹部７６、７６が形成される。本実施形態では、空間凹部７６、７６は、２箇所に形成される。各空間凹部７６、７６の底部には、入力プランジャ３（主ロッド部２４）から径方向外方に突出されるピン部材３３の先端が挿通される挿通孔７７がそれぞれ形成される。保持凹部７５、７５及び空間凹部７６、７６共に平面視矩形状に形成される。   An end surface 73 of the holder main body 71 that is directed outward in the radial direction of the assist member 4 is formed on the curved surface 73 so as to coincide with the outer peripheral surface of the main body 37 of the assist member 4. A flat portion 74 is formed on the top of the curved surface 73 over the entire length direction (axial direction of the assist member 4). A plurality of holding recesses 75 are formed on the curved surface 73 at intervals in the longitudinal direction. In the present embodiment, the holding recesses 75 and 75 are formed at three locations, that is, both ends in the longitudinal direction of the holder main body 71 and a central portion in the longitudinal direction. Magnet members 67, 67 are arranged in the holding recesses 75, 75, respectively. After the magnet member 67 is disposed in each holding recess 75, the holding recess 75 is closed by the lid 78. Between the holding recesses 75 and 75, space recesses 76 and 76 are formed. In the present embodiment, the space recesses 76 are formed at two locations. An insertion hole 77 through which the tip of the pin member 33 protruding radially outward from the input plunger 3 (main rod portion 24) is formed at the bottom of each space recess 76, 76, respectively. Both the holding recesses 75 and 75 and the space recesses 76 and 76 are formed in a rectangular shape in plan view.

ホルダ本体部７１の、アシスト部材４に設けた各突起片５１、５１と対向する面には、各突起片５１、５１に向かって突設する複数の規制片７２、７２が設けられる。各規制片７２、７２は、各突起片５１、５１それぞれに対応して設けられる。磁石ホルダ７０のホルダ本体部７１が、アシスト部材４の収容凹部４７に収容されて組付完了時には、磁石ホルダ７０の各規制片７２、７２が、アシスト部材４の各突起片５１、５１よりも径方向内側に位置して、各規制片７２、７２と各突起片５１、５１とが係合される。この各規制片７２、７２と各突起片５１、５１との係合により、磁石ホルダ７０がアシスト部材４の収容凹部４７から径方向外方に離脱するのを抑制することができる。   A plurality of restricting pieces 72 and 72 projecting toward the projecting pieces 51 and 51 are provided on the surface of the holder main body 71 facing the projecting pieces 51 and 51 provided on the assist member 4. Each regulation piece 72, 72 is provided corresponding to each projection piece 51, 51. When the holder main body 71 of the magnet holder 70 is housed in the housing recess 47 of the assist member 4 and the assembly is completed, the restricting pieces 72 and 72 of the magnet holder 70 are more than the projecting pieces 51 and 51 of the assist member 4. Each regulation piece 72, 72 and each projection piece 51, 51 are engaged with each other at the radially inner side. Due to the engagement between the restricting pieces 72 and 72 and the protruding pieces 51 and 51, the magnet holder 70 can be prevented from detaching radially outward from the accommodating recess 47 of the assist member 4.

なお、磁石ホルダ７０に保持された各磁石部材６７、６７は、アシスト部材４の軸方向に沿って磁化されたものであっても良いし、アシスト部材４の径方向に沿って磁化されたものであってもよい。各磁石部材６７、６７を、アシスト部材４の軸方向に沿って磁化させたものの場合には、磁石ホルダ７０及び蓋体７８を非磁性材料で構成する。一方、各磁石部材６７、６７を、アシスト部材４の径方向に磁化させたものの場合には、蓋体７８を磁性材料にて構成してヨークとすることができる。   The magnet members 67 and 67 held by the magnet holder 70 may be magnetized along the axial direction of the assist member 4 or magnetized along the radial direction of the assist member 4. It may be. When the magnet members 67 and 67 are magnetized along the axial direction of the assist member 4, the magnet holder 70 and the lid 78 are made of a nonmagnetic material. On the other hand, when the magnet members 67 and 67 are magnetized in the radial direction of the assist member 4, the lid 78 can be made of a magnetic material to form a yoke.

一方、ホールセンサユニット６８は、ハウジング８に固定され、磁石ホルダ７０に保持された各磁石部材６７、６７から発生する磁束密度により、入力プランジャ３及び入力ロッド２のストローク量を表す信号を出力するものである。ホールセンサユニット６８は、電動モータ６の後方に配置される。ホールセンサユニット６８は、各磁石部材６７、６７からの磁束密度を検出する、磁気センサであるホールＩＣチップ８０と、ホールＩＣチップ８０が取り付けられる電子基板８１と、該電子基板８１を保持して、これら電子基板８１及びホールＩＣチップ８０を収容するケーシング８２と、を備えている。ホールＩＣチップ８０は、磁石ホルダ７０に保持された各磁石部材６７、６７に近接して配置されている。ホールセンサユニット６８のケーシング８２が、電動モータ６を収容するリアハウジング１０の後端開口を塞ぐように、リアハウジング１０に固定される。   On the other hand, the Hall sensor unit 68 is fixed to the housing 8 and outputs a signal indicating the stroke amount of the input plunger 3 and the input rod 2 based on the magnetic flux density generated from the magnet members 67 and 67 held by the magnet holder 70. Is. The hall sensor unit 68 is disposed behind the electric motor 6. The Hall sensor unit 68 holds a Hall IC chip 80 that is a magnetic sensor for detecting the magnetic flux density from each of the magnet members 67, 67, an electronic substrate 81 to which the Hall IC chip 80 is attached, and the electronic substrate 81. And a casing 82 for housing the electronic substrate 81 and the Hall IC chip 80. The Hall IC chip 80 is disposed in the vicinity of the magnet members 67 and 67 held by the magnet holder 70. The casing 82 of the hall sensor unit 68 is fixed to the rear housing 10 so as to close the rear end opening of the rear housing 10 that houses the electric motor 6.

図１に示すように、電動モータ６は、マスタシリンダ、入力プランジャ３及び入力ロッド２とは別軸でハウジング８内に収容されている。電動モータ６は、その本体部がリアハウジング１０内に収容され、その出力軸１０２がフロントハウジング９内に延出している。電動モータ６の出力軸１０２に取り付けられたプーリ１０３と回転直動変換機構５の回転部材１１０とにベルト１０４が巻回されている。そして、電動モータ６の回転駆動により、回転直動変換機構５の回転部材１１０を回動させて、回転直動変換機構５により、その直動部材を直動させるように構成される。   As shown in FIG. 1, the electric motor 6 is housed in a housing 8 on a separate axis from the master cylinder, the input plunger 3 and the input rod 2. The main body of the electric motor 6 is housed in the rear housing 10, and the output shaft 102 extends into the front housing 9. A belt 104 is wound around a pulley 103 attached to an output shaft 102 of the electric motor 6 and a rotating member 110 of the rotation / linear motion converting mechanism 5. The rotation member 110 of the rotation / linear motion conversion mechanism 5 is rotated by the rotational drive of the electric motor 6, and the linear motion member is linearly moved by the rotation / linear motion conversion mechanism 5.

そこで、本電動倍力装置１の製造時には、磁石部材６７、６７を保持したアシスト部材４内に、入力ロッド２及び入力プランジャ３を組み込んだ部分組立体１１１が組み立てられる。この部分組立体１１１の組立方法を以下に説明する。
まず、磁石ホルダ７０の各保持凹部７５、７５のそれぞれに磁石部材６７、６７を配置した後、蓋体７８にて各保持凹部７５、７５を閉塞する。 Therefore, when the electric booster 1 is manufactured, the subassembly 111 in which the input rod 2 and the input plunger 3 are incorporated in the assist member 4 holding the magnet members 67 and 67 is assembled. A method for assembling the subassembly 111 will be described below.
First, after the magnet members 67 and 67 are disposed in the holding recesses 75 and 75 of the magnet holder 70, the holding recesses 75 and 75 are closed by the lid 78.

次に、入力プランジャ３の後端面に、第１バネ受部材６０の第１内側支持部６２を当接させながら、第１バネ受部材６０の内部に第１圧縮コイルバネ６５をその大径側一端から挿入して、第１圧縮コイルバネ６５の大径側一端を第１バネ受部材６０の第１内側支持部６２に当接させる。続いて、入力ロッド２をそのボールジョイント２０側の一端から第１圧縮コイルバネ６５内に挿入しつつ、入力ロッド２のボールジョイント２０を入力プランジャ３の球状凹部３０に係合させ、第１圧縮コイルバネ６５の小径側他端を入力ロッド２の環状段差部１９に当接させる。この状態で、入力プランジャ３の環状凹部２９にカシメ用工具を挿入して、入力プランジャ３の球状凹部３０をかしめることで、入力プランジャ３と入力ロッド２とを連結して、入力部材組立体１１２を構築する。   Next, the first compression coil spring 65 is connected to the rear end surface of the input plunger 3 while the first inner support portion 62 of the first spring receiving member 60 is in contact with the large diameter side end of the first spring receiving member 60. And the one end on the large diameter side of the first compression coil spring 65 is brought into contact with the first inner support portion 62 of the first spring receiving member 60. Subsequently, while the input rod 2 is inserted into the first compression coil spring 65 from one end on the ball joint 20 side, the ball joint 20 of the input rod 2 is engaged with the spherical recess 30 of the input plunger 3 to thereby form the first compression coil spring. The other end on the small diameter side of 65 is brought into contact with the annular step portion 19 of the input rod 2. In this state, a caulking tool is inserted into the annular concave portion 29 of the input plunger 3 and the spherical concave portion 30 of the input plunger 3 is caulked to connect the input plunger 3 and the input rod 2 to each other. 112 is constructed.

次に、この入力部材組立体１１２の入力プランジャ３をアシスト部材４内に挿入して、入力ロッド２を、入力プランジャ３の主ロッド部２４の前端面がアシスト部材４内のストッパ面４２に当接するまで第１圧縮コイルバネ６５の付勢力に抗して押し込み、該入力ロッド２を押し込んだままの状態とする。この挿入時、入力プランジャ３の外周面から径方向外方に突出したピン部材３３は、アシスト部材４の案内溝４８内を移動しながら、アシスト部材４のスリット４９から収容凹部４７内に突出した状態となる。   Next, the input plunger 3 of the input member assembly 112 is inserted into the assist member 4, and the front end surface of the main rod portion 24 of the input plunger 3 is brought into contact with the stopper surface 42 in the assist member 4. It pushes in against the urging | biasing force of the 1st compression coil spring 65 until it contacts, and it is set as the state which pushed in this input rod 2. FIG. During this insertion, the pin member 33 protruding radially outward from the outer peripheral surface of the input plunger 3 protrudes from the slit 49 of the assist member 4 into the housing recess 47 while moving in the guide groove 48 of the assist member 4. It becomes a state.

次に、アシスト部材４の収容凹部４７に突出したピン部材３３に、磁石ホルダ７０の後側の空間凹部７６の底部に設けた挿通孔７７を挿通して、磁石ホルダ７０をアシスト部材４の収容凹部４７を配置する。このとき、磁石ホルダ７０の各規制片７２、７２と、アシスト部材４の対応する各突起片５１、５１との軸方向の位置はずれている、すなわち、磁石ホルダ７０の各規制片７２、７２が、アシスト部材４の対応する各突起片５１、５１よりも前方に位置するために、磁石ホルダ７０をアシスト部材４の収容凹部４７に配置することが可能になる。   Next, the pin member 33 protruding into the housing recess 47 of the assist member 4 is inserted through the insertion hole 77 provided in the bottom of the space recess 76 on the rear side of the magnet holder 70 so that the magnet holder 70 is housed in the assist member 4. A recess 47 is disposed. At this time, the axial positions of the restricting pieces 72 and 72 of the magnet holder 70 and the corresponding protruding pieces 51 and 51 of the assist member 4 are shifted, that is, the restricting pieces 72 and 72 of the magnet holder 70 are displaced. The magnet holder 70 can be disposed in the accommodating recess 47 of the assist member 4 because the assist member 4 is positioned in front of the corresponding protruding pieces 51, 51.

次に、入力ロッド２の押し込みを解除すると、第１圧縮コイルバネ６５の付勢力により、入力プランジャ４及び入力ロッド２がアシスト部材４に対して後方に最大限移動すると共に、磁石ホルダ７０も後方に移動する。この磁石ホルダ７０の移動により、磁石ホルダ７０の各規制片７２、７２が、アシスト部材４の対応する各突起片５１、５１の径方向内側に入り込むように係合する。この結果、磁石ホルダ７０がアシスト部材４の収容凹部４７から径方向外側に離脱することを規制することができる。また、この状態においては、アシスト部材４の貫通孔部５３と、入力プランジャ３の環状溝部３５とは、その軸方向に沿う位置が略一致する。   Next, when the pushing of the input rod 2 is released, the urging force of the first compression coil spring 65 moves the input plunger 4 and the input rod 2 to the maximum with respect to the assist member 4, and the magnet holder 70 also moves rearward. Moving. Due to the movement of the magnet holder 70, the restricting pieces 72, 72 of the magnet holder 70 engage so as to enter the radially inner side of the corresponding protruding pieces 51, 51 of the assist member 4. As a result, it is possible to restrict the magnet holder 70 from detaching radially outward from the housing recess 47 of the assist member 4. Further, in this state, the positions along the axial direction of the through hole portion 53 of the assist member 4 and the annular groove portion 35 of the input plunger 3 substantially coincide with each other.

次に、ストップキー５５をアシスト部材４の貫通孔部５３に挿入して、ストップキー５５の一対の挟持片５６、５６に設けた円弧状凹部５８、５８を、入力プランジャ３の主ロッド部２４の環状溝部３５に沿うように配置する。この結果、このストップキー５５により、アシスト部材４と入力部材組立体１１２とが部分組立体１１１としてユニット化される。この部分組立体１１１をリアハウジング１０の円筒部１５内に組み込むようにする。すると、磁石ホルダ７０の湾曲面７３（アシスト部材４の径方向外方に指向する端面）が、円筒部１５の内周面に沿うように配置される。
これにより、部分組立体１１１において、磁石ホルダ７０がアシスト部材４の収容凹部４７から離脱することがないので、部分組立体１１１をリアハウジング１０の円筒部１５内に容易に組み付けることができる。 Next, the stop key 55 is inserted into the through-hole portion 53 of the assist member 4, and the arc-shaped concave portions 58 and 58 provided in the pair of holding pieces 56 and 56 of the stop key 55 are replaced with the main rod portion 24 of the input plunger 3. It arrange | positions so that the annular groove part 35 of this may be followed. As a result, the assist member 4 and the input member assembly 112 are unitized as a subassembly 111 by the stop key 55. This subassembly 111 is assembled into the cylindrical portion 15 of the rear housing 10. Then, the curved surface 73 of the magnet holder 70 (end surface directed outward in the radial direction of the assist member 4) is arranged along the inner peripheral surface of the cylindrical portion 15.
Thereby, in the subassembly 111, the magnet holder 70 is not detached from the accommodating recess 47 of the assist member 4, so that the subassembly 111 can be easily assembled in the cylindrical portion 15 of the rear housing 10.

次に、本電動倍力装置１の通電時の作動について説明する。
ブレーキペダルを操作して入力ロッド２を前進させ、入力プランジャ３と共に各磁石部材６７、６７が前進する（アシスト部材４に対して相対移動する）と、ブレーキペダルの操作量、すなわち、ホールＩＣチップ８０により検出される各磁石部材６７、６７からの磁束密度により入力プランジャ３及び入力ロッド２のストローク量が検出され、その検出結果に基づいて電動モータ６が駆動される。電動モータ６の回転駆動は、回転直動変換機構５に伝達されて、該回転直動変換機構５により推力伝達部材９０が前進する。
その結果、まず、ブレーキペダルの操作により入力プランジャ３（入力ロッド２）が先行して、その押圧部２６がリアクションディスク８４を押圧し、続いて、アシスト部材４が入力プランジャ３を追従するように、第２及び第３圧縮コイルバネ９４、１００の付勢力に抗して前進してリアクションディスク８４を押圧する。そして、ブレーキペダルの操作に伴う入力プランジャ３の推進力と、電動モータ６からのアシスト部材４の推進力とがリアクションディスク８４を介して出力ロッド８６に伝達されて、該出力ロッド８６が前進することで、マスタシリンダのピストンが前進する。 Next, the operation when the electric booster 1 is energized will be described.
When the input rod 2 is moved forward by operating the brake pedal, and the magnet members 67 and 67 move forward together with the input plunger 3 (relatively move with respect to the assist member 4), the operation amount of the brake pedal, that is, the Hall IC chip The stroke amount of the input plunger 3 and the input rod 2 is detected by the magnetic flux density from each of the magnet members 67 and 67 detected by 80, and the electric motor 6 is driven based on the detection result. The rotation drive of the electric motor 6 is transmitted to the rotation / linear motion conversion mechanism 5, and the thrust transmission member 90 advances by the rotation / linear motion conversion mechanism 5.
As a result, first, the input plunger 3 (input rod 2) is preceded by the operation of the brake pedal, the pressing portion 26 presses the reaction disk 84, and then the assist member 4 follows the input plunger 3. The second and third compression coil springs 94 and 100 are moved forward against the urging force of the second and third compression coil springs 94 and 100 to press the reaction disk 84. Then, the propulsive force of the input plunger 3 accompanying the operation of the brake pedal and the propulsive force of the assist member 4 from the electric motor 6 are transmitted to the output rod 86 via the reaction disk 84, and the output rod 86 moves forward. As a result, the piston of the master cylinder moves forward.

これにより、マスタシリンダの液圧室に液圧が発生して、該液圧室で発生したブレーキ液圧が、各車輪のホイールシリンダに供給され、摩擦制動による制動力が発生する。なお、マスタシリンダにおける液圧発生時には、液圧室の液圧を、リアクションディスク８４を介して入力プランジャ３の押圧部２６によって受圧し、その反力が、入力プランジャ３及び入力ロッド２を介してブレーキペダルに伝達されるようになる。そして、アシスト部材４の後端面の受圧面積と入力プランジャ３の押圧部２６の受圧面積との比が、倍力比（ブレーキペダルの操作力に対する液圧出力の比）となって、所望の制動力を発生させることができる。   As a result, a hydraulic pressure is generated in the hydraulic pressure chamber of the master cylinder, and the brake hydraulic pressure generated in the hydraulic pressure chamber is supplied to the wheel cylinder of each wheel, and a braking force by friction braking is generated. When hydraulic pressure is generated in the master cylinder, the hydraulic pressure in the hydraulic chamber is received by the pressing portion 26 of the input plunger 3 via the reaction disk 84, and the reaction force is received via the input plunger 3 and the input rod 2. It will be transmitted to the brake pedal. The ratio between the pressure receiving area of the rear end surface of the assist member 4 and the pressure receiving area of the pressing portion 26 of the input plunger 3 becomes a boost ratio (ratio of hydraulic pressure output to the operating force of the brake pedal), and a desired control. Power can be generated.

次に、ブレーキペダル６の操作を解除すると、ストローク検出手段７にて検出した入力プランジャ３３及び入力ロッド２のストローク量に基づいて電動モータ６を逆回転させることで、マスタシリンダのピストンが後退して、マスタシリンダ４の液圧室の液圧が減圧されて制動力が解除される。   Next, when the operation of the brake pedal 6 is released, the piston of the master cylinder moves backward by rotating the electric motor 6 in reverse based on the stroke amount of the input plunger 33 and the input rod 2 detected by the stroke detection means 7. Thus, the hydraulic pressure in the hydraulic chamber of the master cylinder 4 is reduced and the braking force is released.

以上説明したように、本実施形態に係る電動倍力装置１では、各磁石部材６７、６７を保持した磁石ホルダ７０を、アシスト部材４に配置して、ホールＩＣチップ８０を、電動モータ６を収容するリアハウジング１０の後方に備えたので、従来の電動倍力装置に比べて、入力ロッド２の軸方向に沿う長さを短縮することができる。   As described above, in the electric booster 1 according to the present embodiment, the magnet holder 70 holding the magnet members 67 and 67 is disposed on the assist member 4, and the Hall IC chip 80 is replaced with the electric motor 6. Since it was provided behind the rear housing 10 to accommodate, the length along the axial direction of the input rod 2 can be shortened compared with the conventional electric booster.

また、本実施形態に係る電動倍力装置１では、アシスト部材４は、その外周面に、入力プランジャ３の移動方向に沿って設けられる収容凹部４７と、該収容凹部４７の周辺から該収容凹部４７の上方に向かって互いに対向するように突設される一対の突起片５１、５１と、その一端内周面から軸方向に沿って形成される案内溝４８と、該案内溝４８と連続するように収容凹部４７の底部を軸方向の所定範囲径方向に貫通するスリット４９と、を備え、入力プランジャ３には、その外周面から径方向外方に延び、案内溝４８及びスリット４９に挿通可能なピン部材３３が設けられ、磁石ホルダ７０は、アシスト部材４内に挿入された入力プランジャ３から収容凹部４７にスリット４９を介して突出したピン部材３３に接続されると共に、アシスト部材４の収容凹部４７に、入力プランジャ３の移動方向に沿って移動可能に収容され、磁石ホルダ７０には、アシスト部材４に設けた一対の突起片５１、５１との干渉により磁石ホルダ７０の収容凹部４７からの離脱を規制する一対の規制片７２、７２が設けられ、入力ロッド２とアシスト部材４との間に、磁石ホルダ７０を、その規制片７２、７２がアシスト部材４の突起片５１、５１に入力ロッド２の移動方向に沿って一致する位置に付勢する第１圧縮コイルバネ６５が設けられる。
これにより、本電動倍力装置１の製造時、磁石ホルダ７０がアシスト部材４の収容凹部４７から離脱することなく、部分組立体１１１をリアハウジング１０の円筒部１５内に容易に組み付けることができる。 Further, in the electric booster 1 according to the present embodiment, the assist member 4 has an accommodation recess 47 provided on the outer peripheral surface along the moving direction of the input plunger 3, and the accommodation recess from the periphery of the accommodation recess 47. 47, a pair of projecting pieces 51 and 51 projecting so as to face each other, a guide groove 48 formed along the axial direction from the inner peripheral surface of one end thereof, and the guide groove 48 being continuous. The input plunger 3 extends radially outward from its outer peripheral surface and is inserted into the guide groove 48 and the slit 49. A possible pin member 33 is provided, and the magnet holder 70 is connected to the pin member 33 protruding from the input plunger 3 inserted into the assist member 4 into the housing recess 47 through the slit 49, and is The accommodating recess 47 of the member 4 is accommodated so as to be movable along the moving direction of the input plunger 3, and the magnet holder 70 has the magnet holder 70, due to interference with the pair of protruding pieces 51, 51 provided on the assist member 4. A pair of restricting pieces 72, 72 for restricting detachment from the housing recess 47 are provided, the magnet holder 70 is disposed between the input rod 2 and the assist member 4, and the restricting pieces 72, 72 are projecting pieces of the assist member 4. 51 and 51 are provided with a first compression coil spring 65 urging to a position that coincides with the moving direction of the input rod 2.
Thereby, the subassembly 111 can be easily assembled in the cylindrical portion 15 of the rear housing 10 without the magnet holder 70 being detached from the accommodating recess 47 of the assist member 4 when the electric booster 1 is manufactured. .

なお、他の実施形態として、入力プランジャ３の主ロッド部２４から径方向外方に突出したピン部材３３の基部周りで、主ロッド部２４の外周面と磁石ホルダ７０の底面との間にコイルバネを配置するようにしてもよい。これにより、磁石ホルダ７０をコイルバネの付勢力により径方向外方に付勢するために、磁石ホルダ７０の湾曲面７３と円筒部１５の内周面との間の距離を略一定にすることができ、ホールセンサユニット６８のホールＩＣチップ８０による各磁石部材６７からの磁束密度の検出の際の外乱要因を低減することができ、検出精度を向上させることができる。   As another embodiment, a coil spring is provided between the outer peripheral surface of the main rod portion 24 and the bottom surface of the magnet holder 70 around the base portion of the pin member 33 projecting radially outward from the main rod portion 24 of the input plunger 3. May be arranged. Thereby, in order to urge the magnet holder 70 radially outward by the urging force of the coil spring, the distance between the curved surface 73 of the magnet holder 70 and the inner peripheral surface of the cylindrical portion 15 can be made substantially constant. In addition, it is possible to reduce disturbance factors when detecting the magnetic flux density from each magnet member 67 by the Hall IC chip 80 of the Hall sensor unit 68, and to improve the detection accuracy.

１ 電動倍力装置，２ 入力ロッド（入力部材），３ 入力プランジャ（入力部材），４ アシスト部材，６ 電動モータ，７ ストローク検出手段，８ ハウジング，３３ ピン部材，４７ 収容凹部，４８ 案内溝，４９ スリット，５１ 突起片，６５ 第１圧縮コイルバネ（付勢手段），６７ 磁石部材，６８ ホールセンサユニット，７０ 磁石ホルダ，７２ 規制片，８０ ホールＩＣチップ（磁気センサ），   DESCRIPTION OF SYMBOLS 1 Electric booster, 2 Input rod (input member), 3 Input plunger (input member), 4 Assist member, 6 Electric motor, 7 Stroke detection means, 8 Housing, 33 pin member, 47 Housing recessed part, 48 Guide groove, 49 slits, 51 projecting pieces, 65 first compression coil spring (biasing means), 67 magnet member, 68 hall sensor unit, 70 magnet holder, 72 restricting piece, 80 hall IC chip (magnetic sensor),

Claims (1)

ブレーキペダルの操作に伴って移動して、マスタシリンダのピストンを推進する入力部材と、
該入力部材の移動量を検出するストローク検出手段と、
該ストローク検出手段からの信号に基づいて電動モータが回転駆動されることで直動して、マスタシリンダのピストンを推進するアシスト部材と、
該アシスト部材が直動可能に配置されるハウジングと、を備えた電動倍力装置において、
前記ストローク検出手段は、磁石部材を保持して前記アシスト部材と共に移動する磁石ホルダと、前記ハウジングに固定される磁気センサと、を備え、
前記アシスト部材は、前記入力部材が挿通されるように筒状に形成され、
前記アシスト部材は、その外周面に軸方向に沿って設けられる収容凹部と、該収容凹部の周辺から該収容凹部の上方に向かって突設される突起片と、その一端内周面から軸方向に沿って形成される案内溝と、該案内溝と連続するように前記収容凹部の底部を軸方向の所定範囲径方向に貫通するスリットと、を備え、
前記入力部材には、その外周面から径方向外方に延び、前記案内溝及び前記スリットに挿通可能なピン部材が設けられ、
前記磁石ホルダは、前記アシスト部材内に挿入された前記入力部材から前記収容凹部内に前記スリットを介して突出した前記ピン部材に接続されると共に、前記アシスト部材の収容凹部に、前記入力部材の移動方向に沿って移動可能に収容され、
前記磁石ホルダには、前記アシスト部材に設けた突起片との干渉により前記磁石ホルダの前記収容凹部からの離脱を規制する規制片が設けられ、
前記入力部材と前記アシスト部材との間に、前記磁石ホルダを、その規制片が前記アシスト部材の突起片に前記入力部材の移動方向に沿って一致する位置に付勢する付勢部材が設けられる、電動倍力装置。 An input member that moves in accordance with the operation of the brake pedal and propels the piston of the master cylinder;
Stroke detecting means for detecting the amount of movement of the input member;
An assist member that propels the piston of the master cylinder by linearly driving the electric motor based on a signal from the stroke detection means, and driving the piston of the master cylinder;
In an electric booster comprising a housing in which the assist member is arranged to be linearly movable,
The stroke detection means includes a magnet holder that holds a magnet member and moves with the assist member, and a magnetic sensor fixed to the housing.
The assist member is formed in a cylindrical shape so that the input member is inserted,
The assist member includes an accommodation recess provided along an axial direction on an outer peripheral surface thereof, a projecting piece protruding from the periphery of the accommodation recess toward the upper side of the accommodation recess, and an axial direction from an inner peripheral surface of one end thereof. A guide groove formed along the guide groove, and a slit penetrating the bottom of the housing recess in the axial direction within a predetermined range in a radial direction so as to be continuous with the guide groove,
The input member is provided with a pin member that extends radially outward from an outer peripheral surface thereof and can be inserted into the guide groove and the slit.
The magnet holder is connected to the pin member protruding through the slit from the input member inserted into the assist member into the accommodating recess, and the input member is inserted into the accommodating recess of the assist member. Is housed in a movable manner along the direction of movement,
The magnet holder is provided with a regulation piece that regulates the separation of the magnet holder from the housing recess due to interference with the projection piece provided on the assist member,
A biasing member is provided between the input member and the assist member to bias the magnet holder to a position where the restriction piece coincides with the protruding piece of the assist member along the moving direction of the input member. Electric booster.
JP2016147502A 2016-07-27 2016-07-27 Electric booster Active JP6698463B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2016147502A JP6698463B2 (en) 2016-07-27 2016-07-27 Electric booster

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2016147502A JP6698463B2 (en) 2016-07-27 2016-07-27 Electric booster

Publications (2)

Publication Number Publication Date
JP2018016183A true JP2018016183A (en) 2018-02-01
JP6698463B2 JP6698463B2 (en) 2020-05-27

Family

ID=61075115

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2016147502A Active JP6698463B2 (en) 2016-07-27 2016-07-27 Electric booster

Country Status (1)

Country Link
JP (1) JP6698463B2 (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007191133A (en) * 2005-06-30 2007-08-02 Hitachi Ltd Electric booster
JP2015021745A (en) * 2013-07-16 2015-02-02 日立オートモティブシステムズ株式会社 Stroke detection device
WO2016194611A1 (en) * 2015-05-29 2016-12-08 日立オートモティブシステムズ株式会社 Electric booster and stroke detector

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007191133A (en) * 2005-06-30 2007-08-02 Hitachi Ltd Electric booster
JP2015021745A (en) * 2013-07-16 2015-02-02 日立オートモティブシステムズ株式会社 Stroke detection device
WO2016194611A1 (en) * 2015-05-29 2016-12-08 日立オートモティブシステムズ株式会社 Electric booster and stroke detector

Also Published As

Publication number Publication date
JP6698463B2 (en) 2020-05-27

Similar Documents

Publication Publication Date Title
JP6373493B2 (en) Electric booster and stroke detector
JP4692837B2 (en) Electric booster
JP6771640B2 (en) Electric booster
WO2016194582A1 (en) Electric booster
JP5182678B2 (en) Electric booster
JP2019526491A (en) Brake device for hydraulic automotive brake system
JP6570291B2 (en) Electric booster and stroke detector
JPH0577547B2 (en)
CN110925322B (en) Electric clutch actuator with gear mechanism support plate
CN115191073A (en) Driving device for brake system and brake system
JP2018016183A (en) Electric booster
JP6723050B2 (en) Brake control device
CN112298139B (en) Running method of pedal simulation mechanism
CN211943266U (en) Integrated electronic hydraulic brake power assisting device with ball screw
JP2789149B2 (en) Hydraulic pressure control device
JP3311189B2 (en) Braking fluid pressure control device
JP2023018436A (en) Brake control device
CN216269203U (en) Decoupling type brake booster and brake device
JP2017177849A (en) Assistor
CN211308535U (en) Integrated electronic hydraulic brake booster unit with planetary gear speed reducing mechanism
CN211308534U (en) Integrated electronic hydraulic brake booster unit
JP6676368B2 (en) Brake control device
JP2018119883A (en) Electrically driven booster and stroke detection device
JP2569524Y2 (en) Hydraulic pressure control device
JP2017149315A (en) Assistor and stroke simulator

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20190128

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20200401

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20200428

R150 Certificate of patent or registration of utility model

Ref document number: 6698463

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R150

S533 Written request for registration of change of name

Free format text: JAPANESE INTERMEDIATE CODE: R313533

R350 Written notification of registration of transfer

Free format text: JAPANESE INTERMEDIATE CODE: R350

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250