WO2018123581A1 - Mécanisme pour convertir un mouvement rotatif en un mouvement linéaire et dispositif d'assistance électrique - Google Patents

Mécanisme pour convertir un mouvement rotatif en un mouvement linéaire et dispositif d'assistance électrique Download PDF

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Publication number
WO2018123581A1
WO2018123581A1 PCT/JP2017/044655 JP2017044655W WO2018123581A1 WO 2018123581 A1 WO2018123581 A1 WO 2018123581A1 JP 2017044655 W JP2017044655 W JP 2017044655W WO 2018123581 A1 WO2018123581 A1 WO 2018123581A1
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WO
WIPO (PCT)
Prior art keywords
shaft member
rod
axial direction
housing
planetary
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Application number
PCT/JP2017/044655
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English (en)
Japanese (ja)
Inventor
大記 永田
臼井　拓也
Original Assignee
日立オートモティブシステムズ株式会社
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Application filed by 日立オートモティブシステムズ株式会社 filed Critical 日立オートモティブシステムズ株式会社
Publication of WO2018123581A1 publication Critical patent/WO2018123581A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
    • B60T13/74—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with electrical assistance or drive
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
    • F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
    • F16H25/20—Screw mechanisms

Definitions

  • the present invention relates to an electric booster that is incorporated in a brake device of a vehicle such as an automobile and generates a brake fluid pressure in a master cylinder using an electric motor, and a rotary linear motion conversion employed in the electric booster. It relates to the mechanism.
  • a conventional electric booster employs a ball screw mechanism as a rotational linear motion conversion mechanism that converts rotational motion from an electric motor into linear motion.
  • the operation of the electric motor is controlled based on the operation amount of the brake pedal, and the primary piston and the secondary piston of the master cylinder are advanced via the ball screw mechanism, and the input piston
  • the input piston There is one that is configured to generate a brake fluid pressure in the master cylinder by following the displacement (see Patent Document 1).
  • the rotation / linear motion conversion mechanism constitutes a plurality of planetary gears, a nut member to which a rotational motion is imparted, a sun shaft member disposed so as to extend on the same axis in the nut member, And a plurality of planetary shaft members arranged between the nut member and the sun shaft member so as to extend in the same direction as these.
  • the nut member, each planetary shaft member, and the sun shaft member are formed with a helical thread groove and screwed together.
  • each planetary shaft member rotates around its own axis while performing a planetary motion revolving around the axis of the sunshaft member, while each planetary shaft member rotates due to the planetary motion.
  • the sun shaft member moves linearly relative to the housing in the axial direction.
  • a rotation / linear motion conversion mechanism is a cylindrical member disposed in a housing, and a plurality of inner grooves extending along the circumferential direction are formed at intervals along the axial direction.
  • a cylindrical member having an inner peripheral surface and a shaft member disposed in the cylindrical member, wherein a plurality of outer grooves extending along the circumferential direction are formed at intervals along the axial direction.
  • a shaft member having an outer peripheral surface, and a plurality of rod-shaped members disposed along the circumferential direction between the cylindrical member and the shaft member. The rod-shaped member is formed with a plurality of grooves extending along the circumferential direction on the outer circumferential surface of the rod-shaped member at intervals along the axial direction.
  • the plurality of grooves engage with the inner groove of the cylindrical member and the outer groove of the shaft member, respectively.
  • the rotational movement from the tubular member is caused by the engagement between the tubular member and each rod-like member, and the engagement between each rod-like member and the shaft member.
  • To the shaft member, and the shaft member is configured to move linearly relative to the housing.
  • Inner teeth are provided on the inner peripheral surface of the tubular member, and outer teeth that mesh with the inner teeth are provided on the outer peripheral surface of the rod-shaped members.
  • An annular support member having an outer peripheral surface having a tooth portion meshing with the external tooth is provided. The annular support member is fixed to the housing.
  • an electric booster includes a rotation / linear motion conversion mechanism, and the rotation / linear motion conversion mechanism is rotatably supported by a housing and transmits a rotational motion from the electric motor.
  • a plurality of inner grooves extending along the circumferential direction are formed on the inner circumferential surface of the nut member at intervals along the axial direction.
  • a plurality of outer grooves extending along the circumferential direction are formed on the outer peripheral surface of the sun shaft member at intervals along the axial direction.
  • a plurality of grooves extending along the circumferential direction are formed on the outer circumferential surface of the planetary shaft member at intervals along the axial direction.
  • the plurality of grooves engage with the inner groove of the nut member and the outer groove of the sun shaft member, respectively.
  • An internal gear is provided on the entire inner circumferential surface of the nut member in the entire circumferential direction.
  • a ring-shaped sun gear fixed to the housing is provided inside the nut member.
  • Each planetary shaft member is provided with a planetary gear. The planetary gear of each planetary shaft member meshes with the sun gear and the internal gear so as to be sandwiched between the sun gear and the internal gear.
  • FIG. 2 is a cross-sectional view taken along line AA in FIG. 1 and showing a non-operating state of the brake pedal. It is an expanded sectional view which expands and shows the rotation linear motion conversion mechanism periphery employ
  • FIG. 4 is a sectional view taken along line BB in FIG. 3. It is an expanded sectional view which expands and shows the surroundings of the stroke detection apparatus employ
  • it is sectional drawing which shows the state by which the brake pedal was stepped on and the electric motor act
  • the electric booster 1 according to the present embodiment will be described.
  • the left side is the front side (the vehicle front side) and the right side is the rear side (the vehicle rear side) in FIGS. 2, 3, 5 and 6.
  • the electric booster 1 according to the present embodiment generally includes an electric motor 2, a housing 3, an input member 4, a resistance force applying mechanism 5, a rotation / linear motion conversion mechanism 6, and stroke detection.
  • a device 7 and a controller 8 are provided.
  • the electric motor 2 is provided in the housing 3.
  • the input member 4 includes an input rod 10 and an input plunger 11.
  • the input rod 10 is connected to the brake pedal 13 and extends in the housing 3 toward the master cylinder 15.
  • the input plunger 11 is connected to the front end (ball joint portion 85) of the input rod 10, and part of the reaction force from the primary piston 31 and the secondary piston 32 of the master cylinder 15 is transmitted to the input plunger 11.
  • the resistance force applying mechanism 5 changes the resistance force (reaction force) to the input rod 10 and the input plunger 11 when the input rod 10 and the input plunger 11 are moved forward and backward (when the brake pedal 13 is depressed and returned).
  • the hysteresis characteristic to be generated is generated.
  • the rotation / linear motion conversion mechanism 6 assists thrust to the primary piston 31 and the secondary piston 32 of the master cylinder 15 by the operation of the electric motor 2 as the input rod 10 moves forward with the operation of the brake pedal 13. is there.
  • the stroke detection device 7 detects the stroke amount of the input rod 10 and the input plunger 11 with respect to the housing 3 based on the operation amount (stroke amount) of the brake pedal 13.
  • the controller 8 adjusts the relative position between the input member 4 and the booster member 110 based on detection signals from various sensors such as the stroke detection device 7, and the primary chamber 37 in the master cylinder 15 and the desired boost ratio.
  • the operation of the electric motor 2 is controlled in order to generate a brake fluid pressure in the secondary chamber 38.
  • the electric booster 1 has a structure in which a tandem master cylinder 15 is connected to the front side of the housing 3 (left side in FIG. 2).
  • a reservoir 16 for supplying brake fluid to the master cylinder 15 is attached to the top of the master cylinder 15.
  • the housing 3 includes a front housing 20 and a rear housing 23 that closes a rear end opening (right end opening in FIG. 2) of the front housing 20.
  • the front housing 20 is formed with an opening 21 through which the rear end of the master cylinder 15 is inserted.
  • An annular recess 22 is formed around the opening 21 in the front housing 20.
  • the rear housing 23 accommodates the rotation / linear motion conversion mechanism 6, the electric motor 2, and the like, and has a cylindrical portion 24.
  • the cylindrical portion 24 is concentric with the master cylinder 15 and integrally protrudes in a direction away from the master cylinder 15 (backward).
  • a mounting plate 27 is fixed around the cylindrical portion 24 of the rear housing 23.
  • a plurality of stud bolts 28 are attached to the attachment plate 27 so as to penetrate therethrough.
  • this electric booster 1 is arrange
  • the master cylinder 15 is attached to the front surface of the front housing 20.
  • the master cylinder 15 is disposed in the housing 3 through an opening 21 provided at the rear end portion of the front housing 20.
  • a bottomed cylinder bore 30 is formed in the master cylinder 15.
  • a primary piston 31 is disposed on the opening side of the cylinder bore 30.
  • the front portion of the primary piston 31 is disposed in the cylinder bore 30 of the master cylinder 15, and the rear portion of the primary piston 31 extends from the cylinder bore 30 of the master cylinder 15 into the housing 3 of the electric booster 1.
  • the front part and the rear part of the primary piston 31 are each formed in a cup shape and formed in an H-shaped cross section.
  • a spherical recess 35 is formed on the rear surface of the intermediate wall 34 provided substantially at the center in the axial direction of the primary piston 31.
  • a front end spherical surface 143 of a pressing rod 142 of an output rod 137 to be described later is brought into contact with the spherical recess 35.
  • a cup-shaped secondary piston 32 is disposed on the bottom side of the cylinder bore 30.
  • a primary chamber 37 is formed between the primary piston 31 and the secondary piston 32 in the cylinder bore 30 of the master cylinder 15, and a secondary chamber 38 is formed between the bottom of the cylinder bore 30 and the secondary piston 32.
  • Each of the primary chamber 37 and the secondary chamber 38 of the master cylinder 15 is connected to each wheel via two hydraulic pressure circuits (not shown) from the two hydraulic pressure ports (not shown) of the master cylinder 15 via a hydraulic control unit (not shown). Connected to a wheel cylinder (not shown). Then, the brake fluid generated by the master cylinder 15 or the fluid pressure control unit is supplied to the wheel cylinder of each wheel to generate a braking force.
  • the master cylinder 15 is provided with reservoir ports 44 and 45 for connecting the primary chamber 37 and the secondary chamber 38 to the reservoir 16, respectively.
  • annular piston seals 47, 48, 49, and 50 that abut against the primary piston 31 and the secondary piston 32 are provided in the axial direction so as to partition the cylinder bore 30 into a primary chamber 37 and a secondary chamber 38.
  • the piston seals 47 and 48 are disposed so as to sandwich one reservoir port 44 (rear side) along the axial direction.
  • the remaining two piston seals 49 and 50 are disposed so as to sandwich the other reservoir port 45 (front side) along the axial direction.
  • the secondary chamber 38 communicates with the reservoir port 45 via the piston port 63 provided on the side wall of the secondary piston 32. Then, when the secondary piston 32 moves forward from the non-braking position and the piston port 63 reaches one piston seal 50 (front side), the secondary chamber 38 is shut off from the reservoir port 45 by the piston seal 50 to generate hydraulic pressure. .
  • a compression coil spring 65 is interposed between the primary piston 31 and the secondary piston 32.
  • the compression coil spring 65 biases the primary piston 31 and the secondary piston 32 in a direction away from each other.
  • An expansion / contraction member 66 that can expand and contract within a certain range is disposed inside the compression coil spring 65.
  • the telescopic member 66 includes a retainer guide 67 that is in contact with the intermediate wall 34 of the primary piston 31, a retainer rod 68 that is in contact with the secondary piston 32 at its front end and is movable in the retainer guide 67 in the axial direction, Consists of.
  • the retainer guide 67 is formed in a cylindrical shape and has a stopper portion 67A that protrudes inwardly at the front end.
  • the retainer rod 68 has a flange portion 68A that protrudes radially outward at the rear end thereof.
  • a compression coil spring 71 is interposed between the bottom of the cylinder bore 30 and the secondary piston 32.
  • the compression coil spring 71 biases the bottom of the cylinder bore 30 and the secondary piston 32 in a direction away from each other.
  • An expansion / contraction member 72 that can expand and contract within a certain range is also arranged inside the compression coil spring 71.
  • the telescopic member 72 includes a retainer guide 73 whose front end is in contact with the bottom of the cylinder bore 30, a retainer rod 74 whose rear end is in contact with the secondary piston 32 and movable in the retainer guide 73 in the axial direction, Consists of.
  • the retainer guide 73 is formed in a cylindrical shape, and has a stopper portion 73A that protrudes inwardly at the rear end.
  • the retainer rod 74 has a flange portion 74A that protrudes radially outward at the front end thereof.
  • the input plunger 11 and the booster member 110 are respectively arranged from the radially inner side.
  • the input rod 10 of the input member 4 is disposed concentrically within the cylindrical portion 24 of the rear housing 23.
  • the rear end side of the input rod 10 protrudes from the cylindrical portion 24 to the outside.
  • the input rod 10 includes a small-diameter rod portion 80, a large-diameter rod portion 81 that continuously and integrally extends rearward from the small-diameter rod portion 80, and a step portion between the small-diameter rod portion 80 and the large-diameter rod portion 81.
  • a spring receiving portion 82 provided in the cylindrical portion 24 of the rear housing 23.
  • the small-diameter rod portion 80 is gradually reduced in diameter toward the front, and a ball joint portion 85 is formed at the front end thereof.
  • the ball joint portion 85 is connected to the spherical recess 100 at the rear end of the input plunger 11.
  • the rear end portion of the large-diameter rod portion 81 of the input rod 10 is connected to the clevis 90.
  • the input rod 10 is coupled to the brake pedal 13 via a clevis 90. Thereby, when the brake pedal 13 is operated, the input rod 10 moves along the axial direction.
  • the input plunger 11 is formed in a rod shape as a whole and is arranged concentrically with the input rod 10.
  • the input plunger 11 integrally extends forward from the first rod portion 91 and the first rod portion 91, and integrally extends rearward from the second rod portion 92 having a smaller diameter than the first rod portion 91 and the first rod portion 91.
  • a cylindrical caulking portion 93 extending in the direction.
  • a step portion between the first rod portion 91 and the second rod portion 92 acts as a spring receiving portion 94.
  • a first annular groove portion 97 extending in an annular shape and a second annular groove portion 98 extending annularly on the front side of the first annular groove portion 97 are formed on the outer peripheral surface of the first rod portion 91.
  • a pair of holding members of a stop key that integrates a later-described booster member 110 and the input plunger 11 while allowing a predetermined amount of relative movement along the axial direction. 122, 122 are engaged.
  • a pin member 185 extending from the magnet holder 175 of the stroke detection device 7 is fixed to the portion of the second annular groove 98 of the input plunger 11 with reference to FIG.
  • a spherical concave portion 100 to which the ball joint portion 85 of the input rod 10 is connected is formed in the center portion in the radial direction on the rear end surface of the first rod portion 91.
  • the cylindrical caulking portion 93 of the input plunger 11 is formed to have a larger diameter than the outer diameter of the first rod portion 91.
  • An annular recess 101 for inserting a caulking tool is formed on the outer peripheral surface of the cylindrical caulking portion 93.
  • a conical opening 102 that is gradually reduced in diameter toward the front is formed in the cylindrical caulking portion 93.
  • the front end of the conical opening 102 is continuous with the rear end of the spherical recess 100.
  • the ratio plate 105 is brought into contact with the front end surface of the second rod portion 92.
  • the ratio plate 105 includes a disc-shaped pressing portion 106 and a rod portion 107 that extends integrally rearward from the radial center of the disc-shaped pressing portion 106 and has a smaller diameter than the disc-shaped pressing portion 106. It is configured. The rear end of the rod portion 107 of the ratio plate 105 is brought into contact with the front end surface of the second rod portion 92 of the input plunger 11.
  • a booster member 110 is arranged on the outer side in the radial direction of the input plunger 11.
  • the booster member 110 is formed in a cylindrical shape as a whole and is disposed concentrically with the input plunger 11.
  • the booster member 110 is supported so as to be movable in the axial direction on the radially outer side of the input plunger 11 with respect to the cylindrical portion 24 of the rear housing 23.
  • the booster member 110 includes a first opening 111 that opens at the rear end, a second opening 112 that is formed continuously from the first opening 111 to the front side, and has a smaller diameter than the first opening 111, and the first opening 111.
  • the third opening 113 is formed continuously from the second opening 112 to the front side and has a smaller diameter than the second opening 112, and the diameter is larger than the third opening 113 from the third opening 113 to the front side.
  • a fourth opening 114 formed in the first opening 111 and a fifth opening formed continuously from the fourth opening 114 to the front side and opened at the front end of the booster member 110 and having a substantially larger diameter than the first opening 111. Part 115. These first to fifth openings 111 to 115 are formed concentrically.
  • a spring receiving portion 116 is formed at a step portion between the second opening 112 and the third opening 113.
  • a long hole (not shown) through which a pair of clamping members 122, 122 of a stop key (not shown) is inserted is in a certain range along the circumferential direction. It is formed. Further, the opening width of the long hole in the axial direction is formed larger than the thickness of the pair of holding members 122 and 122 of the stop key (the length corresponding to the axial direction of the booster member 110).
  • a notch 119 is formed on the outer peripheral surface directed downward of the booster member 110 so that the first opening 111 and a part of the second opening 112 open downward.
  • the first rod portion 91 of the input plunger 11 is disposed in the first opening portion 111 of the booster member 110.
  • the second rod portion 92 of the input plunger 11 is disposed in the second and third openings 112 and 113 of the booster member 110.
  • the rod portion 107 of the ratio plate 105 is disposed in the third opening 113 of the booster member 110.
  • the disc-shaped pressing portion 106 of the ratio plate 105 is disposed in the fourth opening 114 of the booster member 110.
  • a reaction disk 135 described later is disposed in the fifth opening 115 of the booster member 110.
  • a force transmission flange portion 123 projects outwardly from the outer peripheral surface of the front end of the booster member 110.
  • the axial length from the front end of the fourth opening 114 of the booster member 110 to the front end of the third opening 113 is formed to be longer than the length along the axial direction of the disc-like pressing portion 106 of the ratio plate 105. .
  • a clearance is provided between the front end of the ratio plate 105 and a reaction disk 135 described later.
  • the booster member 110, the input rod 10 and the input plunger 11 include an opening width of an elongated hole provided in the booster member 110 (opening width along the axial direction) and a pair of holding members 122 and 122 of a stop key. Relative movement along the axial direction corresponding to the clearance between the thicknesses of the two and the other is allowed.
  • a compression coil spring 130 is disposed between the front end surface of the booster member 110 and the vicinity of the rear end portion of the master cylinder 15. The boosting member 110 is biased in the backward direction by the biasing force of the compression coil spring 130.
  • the resistance applying mechanism 5 includes a first compression coil spring 125 that urges the booster member 110 and the input plunger 11 away from each other along the axial direction, the cylindrical portion 24 of the rear housing 23, and the input rod 10.
  • a second compression coil spring 126 urging in a direction away from each other along the axial direction, a spring support member 127 for supporting the second compression coil spring 126 between the cylindrical portion 24 of the rear housing 23 and the input rod 10; It has.
  • the outer shape of the first compression coil spring 125 is formed in a cylindrical shape.
  • the first compression coil spring 125 includes a spring receiving portion 116 between the second opening portion 112 and the third opening portion 113 of the booster member 110, the first rod portion 91 and the second rod portion 92 of the input plunger 11. It is arrange
  • the spring support member 127 is disposed in a range from the rear end of the cylindrical portion 24 of the rear housing 23 to the periphery of the small-diameter rod portion 80 of the input rod 10.
  • the spring support member 127 is formed in a bowl shape having an insertion hole 128 through which the small-diameter rod portion 80 of the input rod 10 is inserted.
  • the rear end of the input plunger 11 is disposed close to the front of the bottom of the spring support member 127.
  • the second compression coil spring 126 is disposed between the bottom of the spring support member 127 and the spring receiving portion 82 provided at the step portion between the small diameter rod portion 80 and the large diameter rod portion 81 of the input rod 10. .
  • the outer shape of the second compression coil spring 126 is formed in a truncated cone shape that is reduced in diameter toward the rear. Then, when the brake pedal 13 is depressed (when the input rod 10 and the input plunger 11 are advanced), the reaction force applied to the brake pedal 13 is greatly changed by the resistance applying mechanism 5 and the brake pedal 13 is depressed. When is released (when the input rod 10 and the input plunger 11 are retracted), it is possible to generate a hysteresis characteristic in which the reaction force to the brake pedal 13 changes smaller than when the pedal is depressed.
  • a substantially disc-shaped reaction disk 135 is disposed so as to abut.
  • the reaction disk 135 is made of an elastic body such as rubber.
  • the output rod 137 includes a rod portion 138 having a substantially circular cross section, a disc-shaped portion 139 that is integrally provided at the rear end of the rod portion 138 and has a larger diameter than the rod portion 138, and a rod portion 138. And a pressing rod 142 connected to the front end of the.
  • the disc-shaped portion 139 of the output rod 137 is formed with the same diameter as the reaction disk 135.
  • the disc-shaped portion 139 is disposed in the fifth opening 115 of the booster member 110 so as to contact the reaction disc 135.
  • a fixing hole 140 is formed in the front end surface of the rod portion 138 with a predetermined depth.
  • a pressing rod 142 is fixed to the fixing hole 140.
  • the front end surface of the pressing rod 142 is formed as a spherical surface 143.
  • the front portion of the rod portion 138 of the output rod 137 and the pressing rod 142 extend toward the intermediate wall 34 of the primary piston 31, and the spherical surface 143 provided on the front end surface of the pressing rod 142 of the output rod is a primary surface. It abuts on a spherical recess 35 provided on the rear surface of the intermediate wall 34 of the piston 31.
  • the rotation / linear motion conversion mechanism 6 converts the rotational motion from the electric motor 2 disposed in the housing 3 into the linear motion of the sun shaft member 147, thereby Through this, thrust is applied to the primary piston 31.
  • the rotation / linear motion converting mechanism 6 includes a nut member 145 as a cylindrical member, a plurality of planetary shaft members 146 as rod-like members, and a sun shaft member 147 as a shaft member.
  • the nut member 145 is rotatably supported with respect to the housing 3 by bearings 150 and 151.
  • an inner groove portion 154 is formed that extends in the circumferential direction and is continuously provided at intervals along the axial direction.
  • the inner groove portion 154 is formed in a range excluding both axial end portions.
  • the inner groove portion 154 has a length along the axial direction corresponding to the relative movement distance (stroke amount) of the sun shaft member 147 with respect to the nut member 145.
  • a sun shaft member 147 is disposed concentrically inside the nut member 145.
  • the sun shaft member 147 is formed in a cylindrical shape.
  • the sun shaft member 147 is supported so as not to rotate relative to the housing 3 and to be relatively movable along the axial direction.
  • the front end surface of the sun shaft member 147 is brought into contact with the rear surface of the force transmission flange portion 123 of the booster member 110.
  • An outer groove 155 that extends in the circumferential direction and is continuously provided at intervals along the axial direction is formed on the entire outer circumferential surface of the sun shaft member 147 in the axial direction.
  • the planetary shaft member 146 is formed in a rod shape. A plurality of the planetary shaft members 146 are arranged along the circumferential direction between the nut member 145 and the sun shaft member 147.
  • the outer surface of the planetary shaft member 146 extends along the circumferential direction and engages with each of the inner groove portion 154 of the nut member 145 and the outer groove portion 155 of the sun shaft member 147, and is spaced apart along the axial direction.
  • a continuous groove 156 is formed.
  • the groove portion 156 is formed in a range excluding both end portions in the axial direction of the planetary shaft member 146.
  • the groove 156 has substantially the same axial length as the length along the axial direction of the inner groove 154 provided in the nut member 145.
  • the inner groove 154 of the nut member 145 and the groove 156 of each planetary shaft member 146 are engaged.
  • the inner groove portion 154 of the nut member 145 is formed in an annular groove portion that extends in an annular shape and is formed at intervals in the axial direction
  • the groove portion 156 of each planetary shaft member 146 is a circle of the nut member 145.
  • An embodiment may be adopted in which the pitch is the same as that of the annular groove, the ring is formed in a plurality of annular grooves formed in an annular shape and spaced apart in the axial direction, and both 154 and 156 are engaged.
  • the inner groove portion 154 of the nut member 145 is formed in a positive screw groove portion that spirally extends in the positive direction, and the groove portion 156 of each planetary shaft member 146 is connected to the positive screw groove portion of the inner groove portion 154 of the nut member 145.
  • An embodiment in which the corners are the same and formed in a positive thread groove extending in a spiral shape in the positive direction and the both 154 and 156 are engaged may be adopted.
  • the inner groove portion 154 of the nut member 145 is formed in a reverse screw groove portion that spirally extends in the reverse direction, and the groove portion 156 of each planetary shaft member 146 has the same lead angle as the reverse screw groove portion of the nut member 145.
  • a reverse screw groove portion spirally extending in the reverse direction is formed, and both 154 and 156 are engaged.
  • each planetary shaft member 146 and the outer groove 155 of the sun shaft member 147 are engaged.
  • the outer groove portions 155 of the sun shaft member 147 are: It is formed in a forward thread groove part or a reverse thread groove part that spirally extends in the forward direction or the reverse direction.
  • the groove portion 156 of each planetary shaft member 146 is formed in a positive thread groove portion that spirally extends in the positive direction
  • the outer groove portion 155 of the sun shaft member 147 extends in an annular shape and extends in the axial direction.
  • the lead screw groove portion of the planetary shaft member 146 may have a different lead angle and may be formed in a reverse screw groove portion that spirally extends in the reverse direction.
  • each planetary shaft member 146 when the groove portion 156 of each planetary shaft member 146 is formed in a reverse screw groove portion that spirally extends in the reverse direction, the outer groove portion 155 of the sun shaft member 147 extends in an annular shape and extends in the axial direction.
  • a plurality of annular grooves formed at intervals may be formed, and each planetary shaft member 146 has the same thread angle as the reverse thread groove and is formed into a reverse thread groove extending in a spiral shape in the opposite direction.
  • the lead screw angle of each planetary shaft member 146 may be different from that of the reverse screw groove and may be formed in a positive screw groove extending in a spiral shape in the positive direction.
  • the engaging portion between the groove portion 156 of each planetary shaft member 146 and the outer groove portion 155 of the sun shaft member 147 has a phase difference in the rotational direction between each planetary shaft member 146 and the sun shaft member 147 in the axial direction. Engagement replaced with relative movement may be employed.
  • internal teeth 160 are formed on both ends of the inner circumferential surface of the nut member 145 in the axial direction.
  • Outer teeth 161 that mesh with the inner teeth 160 of the nut member 145 are provided at both axial ends of each planetary shaft member 146. Thereby, rotation of the nut member 145 and the rotation and revolution of each planetary shaft member 146 are synchronized.
  • Two annular support members 164 and 164 are arranged inside the planetary shaft members 146 arranged in the circumferential direction so as to face the external teeth 161 and 161 of the planetary shaft member 146, respectively.
  • the annular support members 164 and 164 have tooth portions 165 (sun gears) and tooth portions 165 (sun gears) formed on the outer peripheral surfaces thereof. And the tooth part 165 of each annular support member 164 and each external tooth 161 of the planetary shaft member 146 are meshed with each other.
  • the one annular support member 164 located on the input rod 10 side is press-fitted and fixed to the outer peripheral surface of the front end of the cylindrical portion 24 of the rear housing 23.
  • the other annular support member 164 located on the master cylinder 15 side is formed integrally with the cylindrical fixing member 167.
  • the cylindrical fixing member 167 is formed in a cylindrical shape having the same inner diameter as the annular support member 164.
  • the fixing portion 168 of the cylindrical fixing member 167 is incorporated and fixed in the annular recess 22 of the front housing 20.
  • each internal tooth 160 of the nut member 145, each external tooth 161 of the planetary shaft member 146, and each tooth portion 165 of each annular support member 164 mesh with each other.
  • the planetary shaft member 146 rotates around its own axis while performing a planetary motion revolving around the axis of the sunshaft member 147, and the planetary shaft member 146 causes the sunshaft member 147 to move along the axial direction. 3 moves relative to 3 linearly.
  • the stroke detection device 7 detects the stroke amount of the input rod 10 and the input plunger 11 based on the operation amount (stroke amount) of the brake pedal 13.
  • the stroke detection device 7 includes a plurality of magnet members 172 and 172 and a hall sensor unit 173.
  • the plurality of magnet members 172 and 172 are held by a magnet holder 175 formed of synthetic resin.
  • the magnet holder 175 includes a plate-like base member 178 and a holder portion 179 fitted to the base member 178.
  • the magnet holder 175 includes a notch 117 provided on the outer peripheral surface of the booster member 110 in which the first opening 111 and a part of the second opening 112 are opened, and the cylindrical portion 24 of the rear housing 23. It is arrange
  • the magnet holder 175 is supported so as to be movable along the axial direction.
  • a fitting hole 182 into which a fitting claw portion 181 of the holder portion 179 described later is fitted is formed at a position corresponding to the fitting claw portion 181.
  • a plurality of receiving recesses 184 are formed in the holder portion 179 at intervals along the axial direction of the input rod 10 (three locations in the figure).
  • the receiving recesses 184 are recessed inward in the radial direction of the input rod 10 at both axial sides thereof, and fitting claws 181 project from the bottom toward the radially inner side.
  • Magnet members 172 and 172 each having a rectangular parallelepiped shape are respectively accommodated in the accommodating recesses 184 and 184 of the holder portion 179, and the fitting claw portions 181 of the holder portion 179 are fitted into the fitting holes 182 of the base member 178.
  • the magnet members 172 and 172 can be held so as to be sandwiched between the holder portion 179 and the base member 178.
  • a pin member 185 projects from the position facing the magnet members 172, 172 located closest to the master cylinder 15 toward the input plunger 11.
  • the pin member 185 is inserted into and fixed to the second annular groove 98 of the input plunger 11 so that the magnet members 172 and 172 held by the magnet holder 175 together with the input plunger 11 move along the axial direction.
  • the Hall sensor unit 173 is fixed to the housing 3 and outputs a signal representing the stroke amount of the input rod 10 and the input plunger 11 by the magnetic flux density generated from the magnet members 172 and 172 held by the magnet holder 175. Is.
  • the hall sensor unit 173 is disposed behind the electric motor 2.
  • the Hall sensor unit 173 includes a Hall IC chip 187 that is a magnetic sensor that detects the magnetic flux density from the magnet members 172 and 172, and an electronic substrate 188 to which the Hall IC chip 187 is attached.
  • the Hall IC chip 187 is disposed close to the magnet members 172 and 172 held by the magnet holder 175.
  • the electric motor 2 is arranged on a separate axis from the master cylinder 15, the input rod 10, the input plunger 11, and the rotation / linear motion conversion mechanism 6.
  • a pulley 190 is attached to the output shaft 2 ⁇ / b> A of the electric motor 2.
  • the output shaft 2 ⁇ / b> A is rotatably supported in the rear housing 23 by bearings 195 and 196, and the front end portion extends into the front housing 20.
  • a pulley 191 is attached to the nut member 145 of the rotation / linear motion converting mechanism 6.
  • a belt 192 is wound around the pulley 190 of the output shaft 2A and the pulley 191 of the nut member 145. The rotational torque from the output shaft 2A of the electric motor 2 is transmitted to the nut member 145 of the rotation / linear motion conversion mechanism 6 via the pulleys 190 and 191 and the belt 192.
  • Each planetary shaft member 146 rotates around the axis of the planetary shaft 146 along with the rotation of the nut member 145 driven by the electric motor 2 and performs planetary motion revolving around the axis of the sunshaft member 147.
  • the sun shaft member 147 moves forward due to the planetary movement of the reshaft member 146, and the booster member 110 moves forward against the biasing force of the compression coil spring 130. Even when the sun shaft member 147 does not move forward, the input rod 10 and the input plunger 11 can move forward alone within a range in which relative movement with respect to the booster member 110 can be permitted in accordance with the operation of the brake pedal 13. .
  • the controller 8 includes a stroke detection device 7, a rotation angle sensor (not shown) that detects the rotation angle of the output shaft 2 ⁇ / b> A of the electric motor 2, a current sensor (not shown) that detects the current supplied to the electric motor 2, and the master cylinder 15.
  • a stroke detection device 7 a rotation angle sensor (not shown) that detects the rotation angle of the output shaft 2 ⁇ / b> A of the electric motor 2
  • a current sensor (not shown) that detects the current supplied to the electric motor 2
  • the master cylinder 15 On the basis of detection signals from various sensors such as a hydraulic pressure sensor for detecting the hydraulic pressure in the primary chamber 37 and the secondary chamber 38 of the primary chamber 37, the booster member 110 of the rotation / linear motion conversion mechanism 6 is propelled to obtain a master with a desired boost ratio.
  • the operation of the electric motor 2 is controlled so as to generate brake fluid pressure in the primary chamber 37 and the secondary chamber 38 in the cylinder 15.
  • the stroke amount of the input rod 10 and the input plunger 11 is detected by the stroke detection device 7, and the electric motor 2 of the electric motor 2 is detected based on the detection result.
  • the rotation is controlled.
  • each planetary shaft member 146 rotates around its own axis while performing a planetary motion revolving around the axis of the sun shaft member 147, while the sun shaft member 147 advances. .
  • each planetary shaft is rotated by the rotational movement of the nut member 145.
  • the member 146 rotates around its own axis in synchronism with the rotational movement of the nut member 145 without generating a slip on the engaging portion with the nut member 145 and the engaging portion with the sun shaft member 147.
  • the planetary motion revolving around the axis of the sun shaft member 147 can be performed.
  • the booster member 110 moves forward against the urging force of the compression coil spring 130.
  • the reaction disk 135 is moved forward while maintaining the relative displacement between the input rod 10 and the input plunger 11 so that the booster member 110 follows the input rod 10 and the input plunger 11. Press together with the ratio plate 105.
  • the ratio between the pressure receiving area of the front end face of the booster member 110 and the pressure receiving area of the front end face of the ratio plate 105 (disk-shaped pressing portion 106) of the input plunger 11 is the boost ratio (operation input of the brake pedal 13).
  • the ratio of the hydraulic pressure output to the desired pressure) can be generated.
  • the input rod 10 and the input plunger 11 are reacted by the hydraulic pressure from the master cylinder 15 (primary chamber 37 and secondary chamber 38).
  • the first compression coil spring 125 including the force is retracted by the biasing force from the first compression coil spring 125 (the biasing force of the second compression coil spring 126 is applied only at the initial stage of release).
  • the stroke amount of the input rod 10 and the input plunger 11 is detected by the stroke detection device 7, and the electric motor 2 rotates reversely based on the detection result, and this reverse rotation is the nut member of the rotation / linear motion conversion mechanism 6. 145.
  • each planetary shaft member 146 rotates in the reverse direction around its own axis while performing a planetary motion that revolves in the reverse direction around the axis of the sun shaft member 147.
  • the sun shaft member 147 moves backward.
  • the booster member 110 moves backward while maintaining the relative displacement between the input rod 10 and the input plunger 11 by the urging force of the compression coil spring 130 and returns to the initial position. .
  • the primary piston 31 and the secondary piston 32 of the master cylinder 15 retreat, the hydraulic pressure in the primary chamber 37 and the secondary chamber 38 of the master cylinder 15 is reduced, and the braking force is released.
  • each planetary shaft member 146 rotates around its own axis as the nut member 145 rotates.
  • the reduction ratio is increased compared to the ball screw mechanism employed in the conventional electric booster. Therefore, the propulsive force of the sun shaft member 147 and thus the output rod 137 can be increased.
  • each planetary shaft member 146 synchronizes with the rotational movement of the nut member 145 without causing any slip to the engaging portion of the nut member 145 and the engaging portion of the sun shaft member 147.
  • Planetary motion revolving around the axis of the sun shaft member 147 while rotating about the axis of the sun shaft.
  • the sun shaft member 147 that moves relatively in the axial direction is not provided with the tooth portion (sun gear) 165, and is different from the sun shaft member 147. Since the annular support member 164 is fixed to the housing 3 and the tooth portion (sun gear) 165 is provided on the outer peripheral surface of the annular support member 164, the axial length of the external teeth 161 provided on the planetary shaft member 146 is increased. This can be minimized regardless of the relative movement amount of the sun shaft member 147. As a result, the size of the rotation / linear motion converting mechanism 6 can be minimized, and the electric booster 1 can be downsized.
  • the rotation / linear motion conversion mechanism 6 is employed in the electric booster 1, but may be employed in other devices such as a parking brake device of a disc brake. Further, in the rotation / linear motion converting mechanism 6 described above, the nut member 145 is imparted with a rotational motion, and the rotational motion from the nut member 145 is transmitted to the sun shaft member 147 via each planetary shaft member 146, Although the sun shaft member 147 is linearly moved along the axial direction, a rotational motion is given to the sun shaft member 147, and the rotational motion from the sun shaft member 147 is transmitted to the nut member 145 via each planetary shaft member 146. And the nut member 145 may be configured to move linearly in the axial direction.
  • positioned in this cylindrical member 145 are arrange
  • An inner groove portion 154 that extends and is provided at intervals along the axial direction is provided, and the outer peripheral surface of the shaft member 147 extends along the circumferential direction and is provided at intervals along the axial direction.
  • a plurality of outer grooves 155 are arranged along the circumferential direction between the cylindrical member 145 and the shaft member 147, and each of the inner groove portion 154 of the cylindrical member 145 and the outer groove portion 155 of the shaft member 147.
  • a rod-shaped member 146 having a groove portion 156 that extends along the circumferential direction on the outer peripheral surface and that is provided at intervals along the axial direction is engaged, and the rotational movement from the cylindrical member 145 is performed in the cylindrical shape.
  • An engagement portion between the member 145 and each rod-shaped member 146, and The rotation / linear motion conversion mechanism 6 is transmitted to the shaft member 147 via the engaging portion between the rod-shaped member 146 and the shaft member 147 and the shaft member 147 moves linearly with respect to the housing 3.
  • Inner teeth 160 are provided on the inner peripheral surface of the rod-shaped member 145, and outer teeth 161 that mesh with the inner teeth 160 are provided on the outer peripheral surface of each rod-shaped member 146, and a tooth portion 165 that meshes with the outer teeth 161 is formed on the outer peripheral surface.
  • An annular support member 164 is provided, and the annular support member 164 is fixed to the housing 3.
  • a nut member 145 that is rotatably supported by the housing 3 and to which the rotational motion from the electric motor 2 is transmitted, and an inner peripheral surface of the nut member 145 are spaced along the circumferential direction.
  • Rotational linear motion conversion having a plurality of planetary shaft members 146 to be engaged and a sun shaft member 147 that is engaged with the outer peripheral surface of each planetary shaft member 146 and is supported so as not to rotate relative to the housing 3.
  • the rotation / linear motion conversion mechanism 6 is provided on the inner circumferential surface of the nut member 145 so as to extend along the circumferential direction and to be spaced apart along the axial direction.
  • the inner shaft portion 154 is provided, and the outer surface of the sun shaft member 147 is provided with an outer groove portion 155 extending along the circumferential direction and continuously provided at intervals along the axial direction.
  • the outer circumferential surface of 146 is engaged with each of the inner groove portion 154 of the nut member 145 and the outer groove portion 155 of the sun shaft member 147, extends along the circumferential direction to the outer circumferential surface, and is spaced along the axial direction.
  • a continuous groove portion 156 is provided, and an inner gear 160 is provided on the inner peripheral surface of the nut member 145 in the entire circumferential direction, and is disposed inside the nut member 145 and is a ring shape fixed to the housing 3.
  • the planetary gears 161 are provided on the planetary shaft members 146, and the planetary gears 161 of the planetary shaft members 146 are engaged with each other so as to be sandwiched between the sun gear 165 and the internal gear 160.
  • the inner groove part 154 of the nut member 145 and the groove part 156 of each planetary shaft member 146 are both configured as a groove part extending in an annular shape, or both Both have the same lead angle and are configured in any one of the configurations configured by screw grooves extending in the same direction.
  • the outer groove portion 155 of the sun shaft member 147 and the groove portion 156 of the planetary shaft member 146 are formed by spiral grooves in which the winding directions of both portions coincide with each other.
  • the two parts one of which is composed of a plurality of annular grooves arranged in the axial direction and the other is composed of spiral grooves, or one of the forms composed of spiral grooves in which the winding directions of both parts are different. Consists of.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Transportation (AREA)
  • Braking Systems And Boosters (AREA)
  • Transmission Devices (AREA)

Abstract

L'invention concerne un mécanisme pour convertir un mouvement rotatif en un mouvement linéaire apte à être conçu pour être compact et obtenir un grand rapport de réduction. Un mécanisme pour convertir un mouvement rotatif en un mouvement linéaire est conçu de telle sorte que le mouvement de rotation d'un élément cylindrique est transmis à un élément d'arbre par l'intermédiaire d'une portion de mise en prise entre l'élément cylindrique et chaque élément de tige et une portion de mise en prise entre chaque élément de tige et l'élément d'arbre et l'élément d'arbre se déplace de façon linéaire par rapport à un boîtier. Des dents internes sont disposées sur la face circonférentielle intérieure de l'élément cylindrique, et des dents externes pour venir en prise avec les dents internes sont disposées sur la face circonférentielle extérieure de chaque élément de tige. Un élément support annulaire comprenant une face circonférentielle externe ayant une portion de dents pour venir en prise avec les dents externes est présent. L'élément support annulaire est fixé au boîtier.
PCT/JP2017/044655 2016-12-26 2017-12-13 Mécanisme pour convertir un mouvement rotatif en un mouvement linéaire et dispositif d'assistance électrique WO2018123581A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2016-251343 2016-12-26
JP2016251343A JP2020029866A (ja) 2016-12-26 2016-12-26 回転直動変換機構及び電動倍力装置

Publications (1)

Publication Number Publication Date
WO2018123581A1 true WO2018123581A1 (fr) 2018-07-05

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PCT/JP2017/044655 WO2018123581A1 (fr) 2016-12-26 2017-12-13 Mécanisme pour convertir un mouvement rotatif en un mouvement linéaire et dispositif d'assistance électrique

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JP (1) JP2020029866A (fr)
WO (1) WO2018123581A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115362090A (zh) * 2020-04-20 2022-11-18 日立安斯泰莫株式会社 制动装置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007100717A (ja) * 2005-09-30 2007-04-19 Toyota Motor Corp 回転−直動変換機構
JP2016124355A (ja) * 2014-12-26 2016-07-11 日立オートモティブシステムズ株式会社 電動倍力装置

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007100717A (ja) * 2005-09-30 2007-04-19 Toyota Motor Corp 回転−直動変換機構
JP2016124355A (ja) * 2014-12-26 2016-07-11 日立オートモティブシステムズ株式会社 電動倍力装置

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