WO2014115874A1 - 車両の電動制動装置 - Google Patents
車両の電動制動装置 Download PDFInfo
- Publication number
- WO2014115874A1 WO2014115874A1 PCT/JP2014/051686 JP2014051686W WO2014115874A1 WO 2014115874 A1 WO2014115874 A1 WO 2014115874A1 JP 2014051686 W JP2014051686 W JP 2014051686W WO 2014115874 A1 WO2014115874 A1 WO 2014115874A1
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- WIPO (PCT)
- Prior art keywords
- screw
- cap
- lubricant
- pressing
- shaft
- Prior art date
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Classifications
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- 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
- F16H57/00—General details of gearing
- F16H57/04—Features relating to lubrication or cooling or heating
- F16H57/048—Type of gearings to be lubricated, cooled or heated
- F16H57/0497—Screw mechanisms
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- 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
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D65/00—Parts or details
- F16D65/14—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position
- F16D65/16—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged in or on the brake
- F16D65/18—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged in or on the brake adapted for drawing members together, e.g. for disc brakes
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- 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
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D55/00—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes
- F16D55/02—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members
- F16D55/22—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads
- F16D55/224—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads with a common actuating member for the braking members
- F16D55/225—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads with a common actuating member for the braking members the braking members being brake pads
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- 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
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D55/00—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes
- F16D55/02—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members
- F16D55/22—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads
- F16D55/224—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads with a common actuating member for the braking members
- F16D55/225—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads with a common actuating member for the braking members the braking members being brake pads
- F16D55/226—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads with a common actuating member for the braking members the braking members being brake pads in which the common actuating member is moved axially, e.g. floating caliper disc brakes
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- 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
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2121/00—Type of actuator operation force
- F16D2121/18—Electric or magnetic
- F16D2121/24—Electric or magnetic using motors
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- 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
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2125/00—Components of actuators
- F16D2125/18—Mechanical mechanisms
- F16D2125/20—Mechanical mechanisms converting rotation to linear movement or vice versa
- F16D2125/34—Mechanical mechanisms converting rotation to linear movement or vice versa acting in the direction of the axis of rotation
- F16D2125/40—Screw-and-nut
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- 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
- F16H25/24—Elements essential to such mechanisms, e.g. screws, nuts
Definitions
- the present invention relates to an electric braking device for a vehicle.
- Patent Literature 1 in an electric braking device using an electric motor, for the purpose of “smoothly swinging the piston during braking”, the “engagement portion of the pressing member with the piston has a spherical surface. After releasing the braking force to the wheel, the electric motor is rotated in the reverse direction to move the nut away from the piston. The pressing member is in a free state, and a gap is formed between the spherical surface and the abutting portion ”(see the summary of Patent Document 1).
- Patent Document 2 discloses an electric braking device that uses an electric motor. “An oil film caused by repeated movement within a specific range to a ball screw that converts rotation of a motor into linear motion and moves a brake pad” For the purpose of avoiding cutting and increasing its friction ”, when the vehicle is stopped and the brake pedal is released, the brake pads of each wheel are simultaneously moved to the pressing release side. After the nut is moved to a position beyond the use area of the screw shaft used in the brake operation until the nut is opposed, it is returned to the neutral position, then moved to the pressing side one by one, and then returned to the neutral position. “ (Refer to the summary etc. of patent document 2).
- This configuration is “the normal use area of the screw shaft through the nut ball by contacting the normal use area of the screw shaft with the ball of the nut that is in contact with the area of the screw shaft except the normal use area. Since the lubricating oil is replenished, the oil film in the normal use region of the screw shaft is regenerated. ”
- Patent Document 3 states that “a seal device is a ball screw that prevents the intrusion of foreign matter into the nut from the outside and prevents the lubricant in the nut from leaking to the outside”.
- a pair of annular seals attached to the ends of the screw nuts and having elastically deformable seal lips are arranged at predetermined intervals by an annular spacer, and the seal lip inner diameter profile of the seal is similar to the vertical cross-sectional shape of the screw shaft It has a shape slightly smaller than the outer diameter of the screw shaft and the space between both seals on the inner diameter side of the spacer is the lubricant filling space ”(Patent Document). (See 3 summary etc.).
- Patent Document 3 describes a ball screw sealing device used as an operating part of a moving device or a positioning device in a machine tool or the like. In these apparatuses, maintenance such as grease can be performed periodically. In an electric braking device for a vehicle, it is necessary to maintain a screw lubrication state for a longer period than a machine tool or the like.
- the present invention has been made to address the above-described problems, and an object of the present invention is to provide a rotation / linear motion conversion mechanism (screw member) of an electric braking device for a vehicle, which can provide good lubrication over a long period of time. It is to provide what can be maintained.
- the electric braking device for a vehicle presses the friction member (MSB) to the rotating member (KTB) fixed to the wheel (WHL) of the vehicle via the electric motor (MTR), thereby the wheel (WHL). To generate braking torque.
- This device presses the friction member (MSB) against the rotating member (KTB), and is rotationally driven by a pressing member (PSN) having a first tube portion (Et1) on the inner periphery and the electric motor (MTR).
- a shaft member (SFT) having a second cylinder part (Et2) that overlaps the outer circumference in the axial direction (Jsf direction) with the first cylinder part (Et1), and the rotational movement of the shaft member (SFT)
- a screw member (NJB) that converts the linear motion of the pressing member (PSN).
- the feature of this device is that it is slidably contacted with the first tube part (Et1) on the outer periphery, and is movable relative to the pressing member (PSN) in the axial direction (Jps direction) of the pressing member (PSN).
- the first cylindrical portion (Et1) is slidably contacted with the second cylindrical portion (Et2) on the inner periphery and is relatively movable in the axial direction (Jsf direction) of the shaft member (SFT) with respect to the shaft member (SFT).
- a cap member (CAP) capable of relative rotation around the axis of the shaft member (SFT) (around Jsf) with respect to at least one of the second cylindrical portions (Et2), and the first
- the screw member (NJB) is defined by the tube portion (Et1), the second tube portion (Et2), and the cap member (CAP), and is connected to one end (Pa2, Pb2) of the screw member (NJB).
- Storage room lubricant (GRS) is filled with (Hch), it lies in having a.
- the pressing member (PSN) has a cup shape having an internal space that is open on one side in the axial direction (Jps direction) and closed on the other side in the axial direction (Jps direction).
- An inner peripheral surface of the side wall portion corresponds to the first tube portion (Et1), one end portion of the shaft member (SFT) is disposed in the inner space, and the one end portion of the shaft member (SFT)
- An outer peripheral surface corresponds to the second cylindrical portion (Et2), and the storage chamber (Hch) is disposed in a portion opposite to the opening with respect to the cap member (CAP) in the internal space. Is preferred.
- the main cause of the deterioration of the lubrication state of the screw member is that gas (air) enters the contact portion of the screw member where power is transmitted (for example, the gap between the flank of the internal thread and the flank of the external thread).
- gas air
- the lubricant for example, grease
- the inflow of gas to the contact portion of the screw member is suppressed and the lubricant is sufficiently supplied, so that the lubrication state of the screw member can be properly maintained.
- a space (storage chamber) in which the lubricant is stored is provided at the end of the screw member, and the storage chamber is filled with the lubricant.
- the storage chamber is partitioned by a cap member whose outer periphery is in sliding contact with the first tube portion (the inner peripheral portion of the pressing member) and whose inner periphery is in sliding contact with the second tube portion (the outer peripheral portion of the shaft member). Lubricant is filled in the space (storage chamber) partitioned in this way.
- the sliding contact portion between the cap member and the first and second tube portions can be a gas inflow path.
- the sealing surface is formed of a linear assembly (for example, a cylindrical shape) in the axial direction, the lubricant can be enclosed with high sealing performance. As a result, inflow of gas from the outside to the storage chamber can be suppressed.
- the sealing device described in Patent Document 3 since the sealing is performed at the ball groove portion, the sealing portion is formed with a curve (that is, there is no bus bar).
- the pressing member is moved in the axial direction (advanced or retracted relative to the rotating member) in order to adjust the braking torque of the wheel.
- This movement also causes the screw member to move forward or backward, so that a volume change can occur in the storage chamber.
- the friction member gradually wears as it continues to be used.
- the wear of the friction member can also change the volume of the storage chamber.
- the apparatus includes a pressing member (PSN) that presses the friction member (MSB) against the rotating member (KTB), a shaft member (SFT) that is rotationally driven by the electric motor (MTR), and the shaft member (SFT). ), And a screw member (NJB) that converts the rotational motion of the pressure member into a linear motion of the pressing member (PSN).
- PSN pressing member
- KTB rotating member
- SFT shaft member
- NJB screw member
- a feature of this apparatus is a sealed space connected to one end (Pb1) of the screw member (NJB), and the space is filled with a lubricant (GRS) that lubricates the screw member (NJB). And the lubricant (GRS) generates a screw gap (Cfk, Csm, Cso, Cmn, Cms, Cns) of the screw member (NJB) by the rotation of the shaft member (SFT). And moving between the sealed chamber (Hmp) and the screw member (NJB).
- GRS lubricant
- the pressing member (PSN) has a cup shape having an internal space that is open on one side in the axial direction (Jps direction) and closed on the other side in the axial direction (Jps direction).
- One end of the SFT is disposed in the internal space, and the sealed chamber (Hmp) is the inner wall surface of the cup shape of the pressing member (PSN) or the one end of the shaft member (SFT). It is preferable to be partitioned by the wall surface.
- the sealed chamber filled with the lubricant (grease) is provided at one end of the screw member.
- the rotational motion is converted into a linear motion by the screw member.
- the linear change of the screw member causes a volume change (increase or decrease in volume) in the sealed chamber.
- the screw member is provided with a screw gap (a flank gap of a trapezoidal screw, a groove gap of a ball screw, etc.). Since the lubricant is sealed and filled in the sealed chamber, the lubricant inside the screw member is moved by this volume change. Specifically, when the volume of the sealed chamber decreases, the lubricant moves from the sealed chamber to the screw member.
- the lubricant moves from the screw member to the sealed chamber. Due to the movement of the lubricant, the lubricant can be updated in the screw member. As a result, a good lubrication state of the screw member can be maintained over a long period of time.
- a feature of this device is that the friction member (MSB) is pressed against the rotating member (KTB) and rotated by a pressing member (PSN) having a first tube portion (Et1) on the inner periphery and the electric motor (MTR).
- a shaft member (SFT) that is driven and has a second tube portion (Et2) that overlaps the first tube portion (Et1) on the outer periphery, and a third tube portion (Et3) on the inner periphery, and the shaft member (SFT) rotational motion is converted into linear motion of the pressing member (PSN), screw member (NJB) disposed inside the third cylindrical portion (Et3), the first cylindrical portion (Et1), And it is divided by the 2nd cylinder part (Et2), is connected to one end (Pb2, Pc2) of the screw member (NJB), and is filled with a lubricant (GRS) that lubricates the screw member (NJB).
- a storage room (Hch) and In the door.
- the pressing member (PSN) has a first cup shape having a first internal space that is open on one side in the axial direction (Jps direction) and closed on the other side in the axial direction (Jps direction).
- the inner peripheral surface of the first cup-shaped side wall portion corresponds to the first tube portion (Et1)
- one end portion of the shaft member (SFT) is disposed in the first inner space
- the one end of (SFT) has a second cup having a second internal space in which an end in the axial direction (Jsf direction) is open and a side opposite to the end in the axial direction (Jsf direction) is closed.
- the storage chamber has a shape, and an outer peripheral surface and an inner peripheral surface of the second cup-shaped side wall portion correspond to the second cylindrical portion (Et2) and the third cylindrical portion (Et3), respectively.
- (Hch) is disposed in the first internal space, and the screw portion (NJB), it is preferable to be disposed in the second internal space.
- one end of the shaft member is inserted into the first internal space of the pressing member such that the opening of the pressing member and the opening of the one end of the shaft member face each other.
- a portion (overlap portion) overlapping in the axial direction is formed between the first tube portion of the pressing member and the second tube portion of the shaft member.
- the screw member is disposed in the second internal space at one end of the shaft member.
- a storage chamber is formed in the first inner space, including the overlap portion and connected to one end of the screw member. This storage chamber is filled with a lubricant.
- the main cause of the deterioration of the lubrication state of the screw member NJB is gas (air) in the contact portion of the screw member NJB where power is transmitted (for example, the gap between the flank of the female screw and the flank of the male screw).
- gas air
- the lubricant in the contact portion is exhausted. Therefore, the inflow of gas to the contact portion of the screw member is suppressed and the lubricant is sufficiently supplied, so that the lubrication state of the screw member can be properly maintained.
- one end portion of the shaft member is inserted into the deep portion of the pressing member (piston) to form the overlap portion.
- the screw member is disposed in the second internal space at one end of the shaft member. Therefore, without extending the overall length of the braking means (brake actuator), the path through which the gas passes from the screw member to the gas portion (the portion (space) where the gas exists, for example, the portion Pb4 in FIG. 2 described later) ( For example, in FIG. 2, a sufficient distance from the end portion Pb2 of the screw member to the gas portion Pb4 can be secured. As a result, the intrusion of gas (air) from the gas portion to the screw member is suppressed, and the lubrication of the screw member NJB can be maintained well over a long period of time.
- FIG. 1 is an overall schematic configuration diagram of an electric braking device according to an embodiment of the present invention. It is a figure for demonstrating the structure of 1st Embodiment of the braking means shown in FIG. It is a figure for demonstrating the screw member shown in FIG. It is a figure for demonstrating the screwing state of the screw member shown in FIG. 2, and a screw gap. It is a figure for demonstrating the transition of the contact state of the flank of the screw member shown in FIG. It is a figure for demonstrating sliding of the cap member shown in FIG. It is a figure for demonstrating the structure of 2nd Embodiment of the braking means shown in FIG.
- a vehicle equipped with this electric braking device includes a braking operation member BP, an electronic control unit ECU, a braking means (brake actuator) BRK, and a storage battery BAT.
- the braking operation member (for example, brake pedal) BP is a member that the driver operates to decelerate the vehicle. Based on the operation amount, the braking means (brake actuator) BRK determines the braking torque of the wheel WHL. The braking force is generated on the wheel WHL.
- the braking operation member BP is provided with a braking operation amount acquisition means BPA.
- the operation amount (braking operation amount) Bpa of the braking operation member BP by the driver is acquired (detected) by the braking operation amount acquisition means BPA.
- a sensor pressure sensor
- a sensor for detecting the pressure of a master cylinder not shown
- an operation force of the braking operation member BP and / or a sensor for detecting a displacement amount (a brake pedal depression force sensor, Brake pedal stroke sensor)
- the braking operation amount Bpa is calculated based on at least one of the master cylinder pressure, the brake pedal depression force, and the brake pedal stroke.
- the braking operation amount Bpa is input to the electronic control unit ECU.
- the braking operation amount Bpa is calculated or acquired by another electronic control unit (for example, an electronic control unit for steering control or an electronic control unit for powertrain control), and the calculated value (signal) is transmitted to the communication bus. Via the ECU.
- control means (control algorithm) CTL for controlling the braking means BRK is programmed, and controls the BRK based on the CTL.
- the storage battery (battery) BAT is a power source that supplies power to BRK, ECU, and the like.
- the control means CTL includes a target pressing force calculation block FBT, an instruction energization amount calculation block IST, a pressing force feedback control block IPT, a pull back control block HMC, and an energization amount adjustment calculation block IMT.
- the control means (control program) CTL is programmed in the electronic control unit ECU.
- the target pressing force Fbt of each wheel WHL is calculated based on the braking operation amount Bpa and the preset target pressing force calculation characteristic (calculation map) CHfb.
- Fbt is a target value of the pressing force, which is a force with which the friction member (brake pad) MSB presses the rotating member (brake disc) KTB in the electric braking means BRK.
- the command energization amount Ist is calculated on the basis of preset calculation characteristics (calculation maps) CHs1 and CHs2 of the command energization amount and the target pressing force Fbt.
- Ist is a target value of the energization amount to the electric motor MTR for driving the electric motor MTR of the electric braking means BRK and achieving the target pressing force Fbt.
- the calculation map of Ist is composed of two characteristics CHs1 and CHs2 in consideration of the hysteresis of the electric braking means BRK.
- the characteristic CHs1 corresponds to the case where the pressing force is increased, and the characteristic CHs2 corresponds to the case where the pressing force is decreased. Therefore, compared with the characteristic CHs2, the characteristic CHs1 is set to output a relatively large command energization amount Ist.
- the energization amount is a state amount (variable) for controlling the output torque of the electric motor MTR. Since the electric motor MTR outputs a torque substantially proportional to the current, the current target value of the electric motor MTR can be used as the target value of the energization amount. Further, if the supply voltage to the electric motor MTR is increased, the current is increased as a result, so that the supply voltage value can be used as the target energization amount. Furthermore, since the supply voltage value can be adjusted by the duty ratio in pulse width modulation (PWM: Pulse Width Modulation), this duty ratio can be used as the energization amount.
- PWM Pulse Width Modulation
- the pressing force feedback energization amount Ipt is calculated based on the target pressing force (target value) Fbt and the actual pressing force (actual value) Fba.
- the command energization amount Ist is calculated as a value corresponding to the target pressing force Fbt, but an error (steady error) occurs between the target pressing force Fbt and the actual pressing force Fba due to the efficiency variation of the electric braking means BRK.
- the pressing force feedback energization amount Ipt is calculated based on a deviation (pressing force deviation) ⁇ Fb between the target pressing force Fbt and the actual pressing force Fba and a preset calculation characteristic (calculation map) CHp, and the above error is calculated. Decided to decrease.
- the actual pressing force Fba is acquired (detected) by a pressing force acquisition unit FBA, which will be described later, and is input to the IPT via an analog / digital conversion unit ADH provided in the ECU.
- a target energization amount (retraction energization amount) Iht for performing the screw retraction operation is calculated based on the braking operation amount Bpa.
- the screw pullback operation adjusts the “contact state (the trapezoidal screw is the contact state of the flank, and the ball screw is the contact state of the ball and the groove)” in the screw member NJB. It is.
- a preset energization amount (predetermined value) iht1 is calculated as a target value while the pullback control is continued.
- the pullback energization amount Iht is set to zero.
- the pullback control block HMC includes a reference position calculation block ZRP and a pattern selection calculation block PTN.
- the reference position calculation block ZRP a position serving as a reference for the contact state of the screw member NJB (contact start position where the friction member MSB starts to contact the rotating member KTB) is determined and stored.
- the pattern selection calculation block PTN “to which contact state the screw member NJB is pulled back” is selected from a plurality of control patterns.
- the contact state of the screw and each pullback control pattern will be described.
- the friction member MSB In the contact state of the screw, the friction member MSB is in contact with the rotating member KTB and the pressing member PSN receives a force from the friction member MSB (that is, the pressing force Fba is generated, hereinafter, “ (Referred to as “pressing contact state”), the friction member MSB and the rotating member KTB just start to be separated and the contact portion of the screw is free (that is, the screw does not transmit any power at all, hereinafter “ A state that is different from that in the pressing contact state, and a state in which the pressing member PSN moves away from the rotating member KTB (hereinafter referred to as a “retracting contact state”), There are three states.
- a “contact release pattern” in which a free contact state is achieved a “contact switching pattern” in which at least a pull back contact state is achieved, and a “limit pull back pattern” in which the screw is pulled back to the screw engagement limit.
- Contact release pattern In the contact release pattern, the contact state of the screw changes from the press contact state to the free contact state. In the contact release pattern, the screw is pulled back until the contact (contact) of the first contact portion of the screw is released and the first contact portion becomes free. Thereafter, the screw is moved to a standby position during non-braking.
- the contact state of the screw transitions from (press contact state) to free contact state to pull back contact state.
- the screw is pulled back through the free contact state until a portion (second contact portion) different from the pressed contact state contacts.
- the flank pressure-side flank during pressing, which is the first flank
- the flank on the opposite side to the flank abutting in the pressing-abutted state (play-side flank during pressing, the second flank) Is pulled back until it comes into contact. Thereafter, the screw is moved to a standby position during non-braking.
- Limit pull back pattern In the limit pull back pattern, the contact state of the screw changes from (press contact state) to free contact state to pull back contact state. In the limit pull-back pattern, the screw is pulled back to the limit portion where the screw can be screwed through the state where the contact portion is switched. For example, in the screw member NJB, the screw is pulled back until the movement is limited by the stopper. Thereafter, the screw is moved to a standby position during non-braking.
- the above contact state is due to the state in which the friction member MSB presses the rotating member KTB. Therefore, the position (contact start position) where the contact between the friction member MSB and the rotation member KTB is started is determined, and based on this, the reference position Zrp at which the contact state is released can be estimated.
- the reference position Zpr is a position where the screw contact state is switched from the press contact state to the free contact state when the pressing force Fba decreases (when the electric motor MTR is reversed).
- the contact start position (the position at which the MSB starts to come into contact with KTB)
- an estimation method based on a pressing force see, for example, Japanese Patent Application Laid-Open No. 2004-124950
- a rotation angle of an electric motor for example, refer to Japanese Patent Application Laid-Open No. 2001-225741
- the determination method of the contact start position based on these known methods includes an error. This error is caused by a detection error of the pressing force sensor, wear of the friction member MSB (including uneven wear), thermal deformation, play (gap) in the BRK power transmission path, and the like.
- a reference position Zrp is set by predicting in advance a margin that can reliably achieve the release of the contact state (release of contact of the first contact portion). That is, the reference position Zrp is determined by adding a predetermined value zgs corresponding to the error so that the influence of the error at the contact start position is offset.
- the predetermined value becomes excessive. Therefore, the maximum value among the errors can be selected and the predetermined value zgs can be determined.
- the error of each component is determined in advance when the BRK is designed.
- the reference position Zrp (when the pressing force Fba decreases) is just switched from the pressing contact state to the free contact state based on at least the pressing force Fba (detected value of the pressing force acquisition means FBA). Position) is determined and stored. Then, based on the stored reference position Zrp and the specifications of the brake actuator BRK (the specifications of the screw gap, the screwing position of the screw, etc.), the target position (electric motor) where each of the control patterns described above can be executed. The target value at the rotation angle) is determined. A minute predetermined value p ⁇ is added to the reference position Zrp, which is the position at which the contact of the first contact portion is released, and the contact release position (target value) Pt1 is determined.
- the screw gap length (known specifications) is added to the reference position Zrp to determine the contact switching position (target value) Pt2. Further, a limit pull back position (target value) Pt3 is set.
- the limit pullback position Pt3 is a position determined by the specifications of the screwed portion of the screw, and therefore does not need to be estimated based on the reference position Zrp.
- the acceleration operation amount Apa is an operation amount of an acceleration operation member (accelerator pedal) AP (not shown), and is acquired (detected) by the acceleration operation amount acquisition means APA.
- the stroke (displacement) of the acceleration operation member is detected as the acceleration operation amount Apa by the acceleration operation amount acquisition means (stroke sensor) APA.
- the shift shift position Spa is a position of a shift shift member (shift lever) SP (not shown) (for example, a parking position, a forward position, a reverse position), and each shift position is acquired by the shift shift position acquisition means SPA ( Detected).
- the vehicle speed Vxa is acquired (detected) by the vehicle speed acquisition means VXA.
- Each wheel WHL is provided with a wheel speed acquisition means VWA, and the vehicle speed Vxa can be calculated based on the wheel speed (rotational speed) Vwa acquired by the VWA.
- Each control pattern is not selected when the braking operation amount Bpa increases or when the braking operation amount Bpa is greater than or equal to the predetermined operation amount bpa0. Any one of the control patterns is selected when the braking operation amount Bpa decreases and Bpa becomes less than the predetermined operation amount bpa0.
- the control pattern selection is performed based on at least one of the vehicle speed Vxa, the acceleration operation amount Apa, and the shift position Spa.
- the limit pullback pattern is selected, and the acceleration operation amount Apa is less than the first predetermined operation amount ap1.
- the second predetermined operation amount (a predetermined value set in advance and smaller than ap1) ap2 or more (ap2 ⁇ Apa ⁇ ap1)
- the contact switching pattern is selected, and the acceleration operation amount Apa is the second
- the contact release pattern can be selected.
- the acceleration operation amount Apa When the acceleration operation amount Apa is large (that is, when the vehicle is rapidly accelerated), the probability of sudden braking is low, and therefore the limit pullback pattern can be selected. On the other hand, when the acceleration operation amount Apa is small (that is, when the vehicle is not rapidly accelerated), the contact release pattern can be selected in preparation for sudden braking by the driver.
- the contact release pattern is selected, the vehicle speed Vxa is less than the first predetermined speed vx1, and the first 2
- a predetermined speed (a predetermined value set in advance and smaller than vx1) vx2 or more (vx2 ⁇ Vxa ⁇ vx1)
- the contact switching pattern is selected, and the vehicle speed Vxa is less than the second predetermined speed vx2.
- a limit pullback pattern may be selected. The greater the pullback amount, the greater the effect of lubrication renewal.
- the smaller the pullback amount the higher the braking torque response. For this reason, when the vehicle speed Vxa is small, a control pattern with a large pullback amount is selected, and when the vehicle speed Vxa is large, a control pattern with a small pullback amount is selected. As a result, the lubrication performance of the screw member NJB and the response of the braking torque can be compatible.
- the target position where the pullback is performed is determined.
- the target position of the pullback control is determined as any one of Pt1 (target position of the contact release pattern), Pt2 (target position of the contact switching pattern), and Pt3 (target position of the limit pullback pattern). Is done.
- the pull back energization amount Iht predetermined predetermined energization amount iht1 is output until Mka reaches the target position. Is done.
- the return energization amount Iht is set to zero, and then the electric motor position Mka is returned to the standby position (for example, the reference position Zrp). It is.
- the electric motor MTR has only to be reversed until the screw operation is restricted by a stopper (a member that restricts the rotation of the screw member NJB at the screwing end). (Rotation angle) Mka is not necessarily required.
- the lubricant for example, grease
- the screw gap head gap, ball / ball groove gap, etc.
- the lubricant GRS stored in the screw gap is moved by adjusting the contact state of the screw.
- the lubrication state of the screw member NJB can be appropriately maintained.
- a target energization amount Imt that is a final target value for the electric motor MTR is calculated.
- the command energization amount Ist is adjusted by the pressing force feedback energization amount Ipt, and the target energization amount Imt is calculated.
- the feedback energization amount Ipt is added to the command energization amount Ist, and this is calculated as the final target energization amount Imt.
- Iht is calculated (Iht ⁇ 0)
- Iht is calculated as the target energization amount Imt.
- the rotation direction of the electric motor MTR forward rotation direction in which the pressing force increases or reverse rotation direction in which the pressing force decreases
- the output (rotational power) of the electric motor MTR is controlled based on the size of the motor.
- the brake means BRK includes a brake caliper (floating caliper) CPR, a rotating member (for example, brake disc) KTB, a friction member (for example, brake pad) MSB, an electric motor (brush motor or brushless motor) MTR, and a drive means ( Electric motor MTR drive circuit) DRV, reduction gear GSK, input member INP, shaft member SFT, screw member NJB, pressing member (brake piston) PSN, key member KYA, position detection means MKA, energization amount acquisition means IMA, It is comprised by the pressing force acquisition means FBA.
- the output (rotational power) of the electric motor MTR is transmitted to the input member INP via the reduction gear GSK.
- the rotational power of the input member INP is transmitted to the shaft member SFT via a universal joint mechanism (not shown).
- the rotational power (torque) of the shaft member SFT is converted into linear power (thrust) by the screw member NJB, which is a rotation / linear motion conversion mechanism, and transmitted to the pressing member PSN.
- the pressing member (brake piston) PSN is moved forward / backward toward the rotating member (brake disc) KTB.
- the force (pressing force) Fba that the friction member (brake pad) MSB presses the rotating member KTB is adjusted. Since rotating member KTB is fixed to wheel WHL, a frictional force is generated between friction member MSB and rotating member KTB, and the braking force is adjusted to wheel WHL.
- the brake caliper CPR is a floating caliper and is configured to sandwich a rotating member (brake disc) KTB via two friction members (brake pads) MSB. Within the caliper CPR, the pressing member PSN is slid and moved forward or backward toward the rotating member KTB. In the caliper CPR, a keyway KYM is formed so as to extend in the direction of the rotation axis (shaft axis) of the shaft member SFT.
- the pressing member (brake piston) PSN generates a frictional force by pressing the friction member MSB against the rotating member KTB.
- the key member KYA is fixed to the pressing member PSN.
- the pressing member PSN is restricted from rotating around the shaft axis, but linear movement in the shaft axis direction (longitudinal direction of the key groove KYM) is allowed.
- a motor with a brush or a brushless motor is adopted as the electric motor MTR.
- the forward rotation direction corresponds to the direction in which the friction member MSB approaches the rotation member KTB (the direction in which the pressing force increases and the braking torque increases)
- the reverse rotation direction corresponds to the friction member MSB.
- the output of the electric motor MTR is determined based on the target energization amount Imt calculated by the control means CTL.
- the electric motor MTR is driven in the forward rotation direction, and the sign of Imt is a negative sign (Imt ⁇ 0).
- the electric motor MTR is driven in the reverse direction.
- the rotational power of the electric motor MTR is determined based on the magnitude (absolute value) of the target energization amount Imt. That is, the larger the absolute value of the target energization amount Imt, the larger the output torque of the electric motor MTR, and the smaller the absolute value of the target energization amount Imt, the smaller the output torque.
- Position acquisition means (for example, angle sensor) MKA detects the position (for example, rotation angle) Mka of the rotor (rotor) of the electric motor MTR.
- the position acquisition means MKA is provided inside the electric motor MTR.
- the driving means (electric circuit for driving the electric motor MTR) DRV controls the energization amount (finally the current value) to the electric motor MTR based on the target energization amount (target value) Imt.
- the driving unit DRV includes a bridge circuit using a plurality of switching elements (power transistors such as MOS-FETs and IGBTs). These elements are driven based on the target energization amount Imt of the electric motor, and the output of the electric motor MTR is controlled. Specifically, the rotation direction and output torque of the electric motor MTR are adjusted by switching the energization / non-energization state of the switching element.
- the energization amount acquisition means (for example, current sensor) IMA acquires (detects) an actual energization amount (for example, current that actually flows through the electric motor MTR) Ima to the electric motor MTR.
- the energization amount acquisition means IMA is provided in the electric motor drive circuit DRV.
- Reducer GSK reduces the rotational speed of the electric motor MTR and outputs it to the input member INP. That is, the rotational output (torque) of the electric motor MTR is increased according to the reduction ratio of the reduction gear GSK, and the rotational force (torque) of the input member INP is obtained.
- the reduction gear GSK is configured by a small diameter gear SKH and a large diameter gear DKH.
- the reduction gear GSK not only a gear transmission mechanism but also a winding transmission mechanism such as a belt or a chain, or a friction transmission mechanism can be adopted.
- the input member INP is fixed to the output shaft of the speed reducer GSK (for example, the rotation shaft of DKH).
- the input member INP transmits rotational power to the shaft member SFT.
- a universal joint UNV is provided between the input member INP and the shaft member SFT.
- the universal joint UNV absorbs the relative angle between the two axes and transmits power. Shaking (swinging) of the shaft member SFT occurs due to bending of the floating caliper CPR, uneven wear of the friction member MSB, etc., and the two shafts (SFT shaft Jsf, INP shaft Jin) are eccentric (shaft misalignment). Although it may occur, the universal joint UNV absorbs this axial deviation.
- the shaft member SFT is a rotating shaft member and transmits the rotational power transmitted from the input member INP to the screw member NJB.
- a universal joint mechanism UNV is configured at one end of the shaft member SFT, and a screw member (rotation / linear motion conversion mechanism) NJB is provided at the other end.
- the screw member NJB is a so-called rotation / linear motion conversion mechanism.
- the screw member NJB includes a nut member NUT and a bolt member BLT.
- the screw member NJB is formed of a trapezoidal screw (sliding screw in which power is transmitted by “sliding”)
- the nut member NUT is provided with a female screw (inner screw) MNJ
- the bolt member BLT has an A screw (outer screw) ONJ is provided.
- the female screw MNJ of the nut member NUT and the male screw ONJ of the bolt member BLT are screwed together.
- the rotational power (torque) transmitted from the shaft member SFT is transmitted as linear power (thrust) of the pressing member PSN via the screw member NJB (male screw ONJ and female screw MNJ that are screwed together).
- the screw member NJB male screw ONJ and female screw MNJ that are screwed together.
- a rolling screw ball screw or the like in which power transmission is performed by “rolling” may be employed instead of the sliding screw.
- the nut member NUT and the bolt member BLT are provided with a thread groove (ball groove), and a ball (steel ball) is fitted therein to operate as a rotation / linear motion conversion mechanism.
- the reaction force (reaction) of the force (pressing force) Fba that the pressing member PSN presses the friction member MSB is acquired (detected).
- the pressing force acquisition means FBA is provided between the input member INP and the caliper CPR. Specifically, the pressing force acquisition means FBA is fixed to the caliper CRP, and the force received by the pressing member PSN from the friction member MSB is acquired as the pressing force Fba.
- the pressing force Fba is detected as an analog signal, converted into a digital signal via an analog / digital conversion means ADH provided in the electronic control unit ECU, and input to the electronic control unit ECU.
- FIG. 2 corresponds to FIG.
- the electric motor MTR, the reduction gear GSK, the pressing member (brake piston) CPR and the like are the same as those in FIG.
- the input member INP is fixed to the output shaft of the reduction gear GSK (for example, the rotation shaft of the large diameter gear DKH).
- the input member INP contacts the shaft member SFT via the universal joint UNV.
- a spherical surface (for example, a concave spherical surface) is formed at the end of the input member INP (the side opposite to the portion fixed to the GSK), and this end can function as a part of the universal joint UNV. .
- the pressing force acquisition means FBA is fixed to the caliper CPR, and acquires (detects) the reaction force (reaction) of the force (pressing force) Fba that the pressing member PSN presses the friction member MSB.
- the pressing force acquisition means FBA is provided in the input member INP and outputs Fba (analog signal).
- a universal joint UNV is provided between the input member INP and the shaft member SFT.
- a spherical member (a member having a concave spherical surface with a radius rq) QMB is provided between the input member INP and the shaft member SFT, and the end surface of the shaft member SFT has a spherical shape (a convex spherical shape with a radius rq). It is said.
- the shaft member SFT and the spherical member QMB slide to function as a universal joint UNV.
- the universal joint UNV transmits power by absorbing the eccentricity (axial deviation) between the axis Jin of the input member INP and the axis Jsf of the shaft member SFT. Note that the above-described shaft misalignment is caused by bending of the floating caliper CPR and uneven wear of the friction member MSB.
- the pressing member PSN slides in the caliper CPR in the axial direction of the PSN (Jsp direction, that is, the axial direction Jsf of the SFT), and presses the friction member MSB against the rotating member KTB.
- the key member KYA and the key groove KYM the movement of the pressing member PSN is performed in the shaft axis direction (longitudinal direction of the key groove KYM) with the rotational movement with respect to the caliper CPR limited. Since the eccentricity of Jin and Jsf is absorbed by the universal joint UNV, the shaft (shaft shaft) Jsf of the shaft member SFT and the shaft (pressing shaft) Jps of the pressing member PSN are coaxial.
- the pressing member PSN has a cup shape. Specifically, the pressing member PSN has a cylindrical shape (cylinder shape), and has a shape in which one is closed and the other is open in the axial direction (Jps direction).
- a first tube portion (inner wall) Et1 is formed on the inner side (inner peripheral side) of the pressing member PSN.
- the first cylindrical portion Et1 has a smooth surface (that is, the surface is formed by an assembly of straight lines and has a generatrix), and is smooth.
- a curved surface is drawn by movement of a straight line, the straight line at each position is a generatrix of the curved surface.
- One end portion of the pressing member PSN is provided with a sealing wall (partition wall) Mp1, and the first cylindrical portion Et1 is closed (closed).
- the other end of the pressing member PSN (opposite side of the sealing wall Mp1) is an opening (one part of PSN) Kk1, and the first tube portion Et1 is in an open state.
- a bolt member BLT having a male screw ONJ is fixed to the pressing member PSN (specifically, the sealing wall Mp1).
- a storage chamber Hch is formed that is partitioned by the first cylindrical portion (inner wall of PSN) Et1, the sealing wall (partition wall of PSN) Mp1, the cap member (lid) CAP, and the second cylindrical portion (outer wall of SFT) Et2. .
- the inside of the storage chamber Hch is filled with the lubricant GRS without being mixed with gas.
- the locations where the lubricant GRS enters and exits from the storage chamber Hch are limited to the screw member NJB (particularly, the gap between the screws) and the cap member CAP (particularly, the gap between Et1 and Et2).
- the screw member NJB converts the rotational power of the shaft member SFT into linear power of the pressing member PSN (that is, a rotation / linear motion conversion mechanism).
- the screw member NJB includes a bolt member BLT and a nut member NUT.
- the bolt member BLT is fixed to the sealing wall Mp1 of the pressing member PSN.
- a male thread (outer thread) ONJ is formed on the bolt member BLT.
- the nut member NUT is fixed to the shaft member SFT.
- a female screw (inner screw) MNJ is formed on the nut member NUT, and the female screw MNJ and the male screw ONJ are screwed together.
- a lubricant GRS is applied to the screw member NJB. Specifically, the gap between the external thread ONJ and the internal thread MNJ is filled with lubricant GRS by removing gas as much as possible.
- the shaft member SFT transmits the rotational power of the input member INP to the screw member NJB.
- a spherical surface (for example, a convex spherical surface) is provided at the end of the shaft member SFT that contacts the input member INP, and slidably contacts the spherical member QMB and functions as a part of the universal joint UNV.
- the shaft member SFT has a cup shape with a diameter smaller than that of the first cylindrical portion Et1 on the side opposite to the portion that contacts the input member INP.
- the second cylinder part Et2 is formed on the outer side
- the third cylinder part Et3 is formed on the inner side.
- the second cylindrical portion Et2 has a straight surface (that is, a bus bar) and is smooth.
- One end portion of the third cylinder portion Et3 is provided with a sealing wall Mp3 so that Et3 is closed.
- the other end (the opposite side of the sealing wall Mp3) of the third cylindrical portion Et3 is an opening (one part of SFT) Kk3, and Et3 is in an open state.
- the shaft member SFT is inserted inside the first cylindrical portion Et1 (for example, a PSN inner peripheral portion having a cylindrical shape) of the pressing member PSN.
- the first cylinder portion Et1 of the pressing member PSN and the second cylinder portion Et2 of the shaft member SFT have an overlap portion (overlapping portion) Ovp.
- a nut member NUT having an internal thread MNJ is fixed to the third cylinder portion Et3.
- a closed space Hmp isolated from the outside and closed
- the third cylindrical portion Et3 for example, an SFT inner peripheral portion having a cylindrical shape
- a nut member NUT Is formed.
- the inside of the sealed chamber Hmp is filled with the lubricant GRS without gas being mixed (gas is removed as much as possible).
- the place where the lubricant enters and exits from the sealed chamber is limited to the screw member NJB (particularly, the gap between the screws).
- the cap member CAP prevents the lubricant GRS from flowing out from the storage chamber Hch (for example, position Pb3) to the external position Pb4, and gas (air) from the external position Pb4 to the storage chamber Hch (for example, position Pb3). It is a lid
- the cap member CAP has a disk shape with a hole in the center, and is in sliding contact with the first cylindrical portion Et1 at the outer peripheral portion thereof, and is in sliding contact with the second cylindrical portion Et2 at the inner peripheral portion thereof.
- the cap member CAP can move in the axial direction relative to the pressing member PSN and the shaft member SFT (linear movement in a direction parallel to the axis, and movement in the Jps direction and Jsf direction). is there.
- relative rotation about the axis with respect to at least one of the pressing member PSN and the shaft member SFT (rotational movement around the axis, around Jps and around at least one axis around Jsf) Relative rotational movement).
- the axis Jps of the pressing member PSN and the axis Jsf of the shaft member SFT are the same.
- the reduction in efficiency of the screw member NJB is largely due to the depletion (grease breakage) of the lubricant GRS.
- the depletion of the lubricant GRS can be caused by gas (air) entering the interface lubricated by the lubricant GRS.
- the lubricant GRS is filled in and around the screw member NJB, and these parts are kept away (isolated) from the part (gas part) where gas (for example, air) exists.
- the lubrication state of the screw member NJB can be maintained well.
- a sealed chamber Hmp is formed at one end (position Pb1) of the screw member NJB, and the inside thereof is fully filled with the lubricant GRS. That is, a dead-end chamber (sealed chamber) Hmp partitioned by a wall is provided at one end of the screw member NJB, and the gas inside is removed as much as possible, and then filled with the lubricant GRS. . For this reason, gas does not flow in from the position Pb1 of one end of the screw member NJB.
- a storage chamber Hch is formed at the other end (position Pb2) of the screw member NJB, and the inside thereof is also filled with the lubricant GRS. That is, even in the Hch, the gas is removed as much as possible to fill the GRS.
- the path through which the gas flows into the storage chamber Hch is from the opening Kk1, but the path is covered (closed) by the cap member CAP, and the inflow of gas from this portion is suppressed.
- the seal described in Patent Document 3 does not have a sufficient sealing effect because the sliding contact surface shape (seal with ball grooves) is not formed in a straight line.
- the first cylindrical portion Et1 and the second cylindrical portion Et2 with which the cap member CAP is slidably contacted have a slidable contact surface (sliding surface) whose shape is a straight line (an assembly of straight lines). ). Therefore, inflow of gas and outflow of lubricant GRS can be effectively prevented.
- the storage chamber Hch (chamber filled with the lubricant GRS) is formed at least over the overlap portion Ovp (internal space of the PSN). That is, the lubricant GRS exists from the end Pb2 of the screw member NJB to the vicinity of the portion Pb4 where the gas exists.
- the path from the screw member NJB (position Pb2) to the position Pb4 can be sufficiently secured without increasing the axial length of the entire BRK. Since the section filled with the lubricant GRS is set longer with respect to the screw member NJB, it is isolated from the gas part (position Pb4), so that the gas inflow to the screw member NJB can be effectively suppressed. .
- a screw gap mountain gap and flank gap
- a screw gap can be a flow path for the lubricant GRS. Due to the movement of the pressing member PSN (advance or retreat with respect to the rotating member), a volume change occurs in the sealed chamber Hmp. Specifically, when the pressing member PSN moves forward toward the rotating member KTB (when the pressing force Fba increases and the braking torque increases), the volume of the sealed chamber Hmp is the amount that the bolt member BLT moves forward. Only increase.
- the volume of the sealed chamber Hmp is decreased by the amount of the bolt member BLT being retracted. Since the screw member NJB and the sealed chamber Hmp are fully filled with the lubricant GRS (that is, no gas is mixed), this volume change causes the lubricant GRS to pass through the gap of the screw member NJB. It can be absorbed by moving to the storage room Hch. Further, the lubricant GRS in the screw member NJB is updated by the movement of the lubricant GRS, and the lubrication state can be properly maintained.
- the universal joint UNV can be provided between the pressing member PSN and the shaft member SFT.
- the first cylindrical portion Et1 (a part of the pressing member PSN, an inner peripheral portion) and the second cylindrical portion Et2 (a part of the shaft member SFT, the outer peripheral portion).
- the cap member CAP is inclined, and the movement of the cap member CAP in the axial direction can be hindered.
- the universal joint UNV is provided between the input member INP and the shaft member SFT, the parallelism between the first cylindrical portion Et1 and the second cylindrical portion Et2 is maintained, and the cap Smooth sliding of the member CAP can be ensured.
- the screw member NJB is a trapezoidal screw and includes a female screw MNJ and a male screw ONJ.
- FIG. 3 is for defining and explaining the names of the respective parts in the screw member NJB.
- the shape of the female thread (inner thread) MNJ is composed of a female thread crest Ymn and a female thread trough (groove) Tmn. Specifically, it is composed of a female thread peak Scm, a female thread flank Fmn, and a female thread root Tzm.
- the male thread (outer thread) ONJ has a male thread crest Yon and a male thread trough (groove) Ton. Specifically, it is constituted by a male thread crest Sco, a male thread flank Fon, and a male thread valley bottom Tzo.
- summits Scm and Sco are flat portions at the top of the crest of the screw
- valley bottoms Tzm and Tzo are flat portions at the bottom of the trough of the screw.
- Franks Fmn and Fon are surfaces that connect the summits Scm and Sco with the valley bottoms Tzm and Tzo.
- Fmn and Fon are straight in the cross section including the rotation axis of the screw. Power is transmitted by pressure contact between the flank Fmn of the internal thread MNJ and the flank Fon of the external thread ONJ.
- FIG. 4 is a diagram for explaining a state in which the internal thread MNJ and the external thread ONJ are screwed together. 4 shows that the female thread crest Ymn and the male thread trough Ton are engaged with the female thread trough Tmn and the male thread crest Yon, and the female thread MNJ presses the male thread ONJ. (In the drawing, the female screw MNJ is pressing the male screw ONJ in the direction of the arrow).
- the flank on which the force is acting is called the pressure side flank (Pressure Flank)
- the flank on the opposite side of the pressure side flank is called the play side flank (Clearance Flank).
- the pitch line Pch is a virtual cylindrical bus (Generatrix) used to define the effective diameter of the screw. That is, it is a cylindrical bus line in which the width Wyo of the external thread is equal to the width Wym of the internal thread, and the internal thread valley width (external thread groove width) Wto and internal thread valley width (internal thread groove width). It can also be said that the width of the cylinder is equal to Wtm.
- the screw gap becomes a moving path of the lubricant GRS between the sealed chamber Hmp and the storage chamber Hch.
- the screw gap is represented by a portion indicated by abbcd-e-f-gh in the cross-sectional shape of the screw, and the crest gap Csm of the female screw MNJ, the crest gap Cso of the male screw ONJ, And it is formed in the flank gap Cfk.
- the crest gap (also the crevice gap of the male thread) Csm of the female thread MNJ is a gap between the crest Scm of the female thread and the crest Tzo of the male thread.
- the top of the female screw surface that connects the flank on both sides of the screw thread.
- a straight line connecting the bottom of the male thread the surface connecting the flank on both sides of the thread groove.
- a crest gap (also a crevice gap of a female thread) Cso of the external thread ONJ is a gap between a crest Sco of the external thread and a trough bottom Tzm of the internal thread.
- the flank gap Cfk is a gap between the flank Fmn of the internal thread MNJ and the flank Fon of the external thread ONJ.
- the volume change of the sealed chamber Hmp occurs due to the movement (movement) of the pressing member PSN. That is, when the pressing force Fba is increased, the volume of the sealed chamber Hmp is increased, and when Fba is decreased, the volume of Hmp is decreased. Since the sealed chamber Hmp is filled with the lubricant GRS, this volume change is absorbed by the lubricant GRS moving through the screw gap. In other words, when the volume of the sealed chamber Hmp decreases, the lubricant GRS in the sealed chamber Hmp is discharged to the screw member NJB. Conversely, when the volume of the sealed chamber Hmp increases, the lubricant GRS is sucked into the sealed chamber Hmp from the screw member NJB. By the movement of the lubricant GRS, the lubricant GRS in the screw member NJB is updated, and the lubrication state can be properly maintained.
- the cross-sectional area of the screw gap is set based on the viscosity of the lubricant GRS. In the no-load state (the pressing force is zero), the rotational power of the electric motor MTR necessary for the flow of the lubricant GRS (that is, the torque loss due to the movement of the lubricant GRS) is less than a predetermined value. In addition, the cross-sectional area of the screw gap can be determined.
- the cross-sectional area of the screw gap is the total area of Csm, Cso, and Cfk in the cross section including the rotation axis (Jps, Jsf) of the screw. In the example shown in FIG. It is the area of the part enclosed by (h).
- the lubricant GRS be moved with respect to the flank gap.
- the thread groove (thread valley) widths Wtm and Wto are the thread width Wym in the thread pitch line Pch so that at least the flank gap Cfk becomes a flow path for the lubricant GRS.
- Wyo is set larger (wider) than Wyo. The lubricant GRS is moved between the sealed chamber Hmp and the storage chamber Hch via the gap (flank gap Cfk).
- flank gap Cfk can be set to a value larger than the standard backlash determined by the screw standard.
- the flank gap Cfk (the distance between the line segment bc and the line segment fg) is the summit gap Csm (the distance between the line segment cd and the line segment ef) of the female screw MNJ and the summit gap Cso (the line of the male screw ONJ). It is set to be larger (wider) than at least one of the distance ab and the line segment gh).
- FIG. 5 corresponds to FIG. That is, the nut member NUT (having the female screw portion MNJ) is fixed to the shaft member SFT, and the bolt member BLT (having the male screw portion ONJ) is fixed to the pressing member PSN.
- the screw member NJB is provided with summit gaps Csm, Cso and flank gaps Cfk (first flank gap Cfk1, second flank gap Cfk2) so that the lubricant (grease) GRS can move.
- the contact state of the screw is a contact state of the flank generated by the mutual positional relationship between the female screw MNJ and the male screw ONJ.
- FIG. 5A shows a state in which the pressing member PSN presses the friction member MSB (that is, the PSN receives a pressing force (reaction) Fba from the MSB), and in the direction indicated by the arrow by the female screw MNJ.
- the male screw ONJ is pressed.
- This contact state is the “press contact state” described above.
- the first flank Fmn1 of the female screw and the first flank Fon1 of the male screw are in contact (that is, Fmn1 and Fon1 are pressure side flank).
- the first flank Fmn1 and Fon1 are referred to as “pressure-side flank during pressing (corresponding to the first contact portion)”.
- the second flank Fmn2 of the female thread and the second flank Fon2 of the male thread are in a non-contact state, and a gap Cfk2 exists between them (that is, Fmn2 and Fon2 are connected to the play side flank).
- the second flank Fmn2 and Fon2 are referred to as “play-side flank when pressed (corresponding to the second contact portion)”.
- the lubricant GRS is filled in the summit gaps Csm and Cso and the flank gap Cfk2.
- FIG. 5B shows a free state in which the electric motor MTR is reversed, and the first flank Fmn1 and Fon1 that have been pressure side flank begin to separate, and the pressing force Fba does not act on the pressing member PSN.
- This contact state is the “free contact state” described above. In the free contact state, all the flank is not in contact.
- the gap (second flank) between the second flank Fmn2 of the female screw and the second flank Fon2 of the male screw which is a play-side flank in the pressed state.
- the lubricant GRS present in the crest gap Cso of the external thread is pushed out to the other flank gap (the first flank gap Cfk1 which is the gap between Fmn1 and Fon1).
- the first flank gap Cfk1 which is the gap between Fmn1 and Fon1.
- grease Gso at the crest gap of the male screw is pushed out by the grease Gfk2u above the pitch line Pch, and Gso is the first. It flows into the flank gap (gap between Fmn1 and Fon1) Cfk1.
- FIG. 5C shows the second flank Fmn2 of the female thread (the flank on the opposite side of the first flank Fmn1 in the female thread MNJ) and the second flank Fon2 of the male thread (the first flank Fon1 in the male thread ONJ).
- the flank on the opposite side comes into contact with the pressure side flank, and the pressing member PSN (male thread portion ONJ) is pulled back in the direction of the arrow.
- This contact state is the “retracting contact state” described above.
- the transition from the “press contact state (see FIG. 5A)” to the “retraction contact state (see FIG. 5C)” is “contact switching”. It is called.
- the contact switching is switching from a state where one flank (first flank Fmn1, Fon1) is in contact to a state where the other flank (second flank Fmn2, Fon2) is in contact.
- Cso the gap between Sco and Tzm
- the lubricant GRS is supplied to the flank Fmn1 and Fon1 that transmits power when the braking torque is increased. (That is, the lubricant GRS is updated). Thereby, the lubrication state of the screw member NJB is appropriately maintained, and the efficiency of BRK can be ensured.
- the supply of the lubricant GRS to the first flank Fmn1 and Fon1 is started at the time when the free contact state is reached, and is completed when the pullback contact state is reached. For this reason, the update of the lubricant (grease) to the first flank Fmn1 and Fon1 can be made at least in a free contact state (the first flank Fmn1 and Fon1 are separated).
- the lubricant GRS stored in the summit gaps Cms and Cos flows into the flank gaps Cfk (Cfk1, Cfk2), and the lubricant GRS in Cfk is updated.
- the lubrication state of the screw member NJB can be maintained and improved.
- the cross-sectional area (cross-sectional area a5-a6-a7-a8) formed by the flank gap (the flank gap from the pitch line Pch to the female thread peak Scm) Cfks is the peak gap Csm of the female thread MNJ.
- cross-sectional area b5-b6-b7-b8 and the cross-sectional area formed by the flank gap are larger than the cross-sectional area (cross-sectional area b1-b2-b3-b4) formed in the crest gap Cso of the male screw ONJ. So that the screw shape of the screw member NJB can be set.
- the cross-sectional area (cross-sectional area a5-a6-a7-a8) formed by the flank clearance Cfks on the female thread peak Scm side with respect to the pitch line Pch is equal to the female thread peak clearance Csm.
- cross-sectional area b5-b6-b7-b8 Larger than the cross-sectional area (cross-sectional area b5-b6-b7-b8) formed "and" the cross-sectional area formed by the flank clearance Cfku on the mountain top Sco side of the external thread with respect to the pitch line Pch (
- the cross-sectional area a1-a2-a3-a4) is larger than the cross-sectional area (cross-sectional area b1-b2-b3-b4) formed by the crest gap Cso of the male screw ". Is set to be satisfied.
- the thread shape can be defined by the width of the gap instead of the definition by the cross-sectional area.
- flank gap Cfk (the width of the gap, for example, the distance between the line segment a1-a2 and the line segment a3-a4) is the female thread crest gap Csm (the gap width).
- the distance between the line segment b5-b6 and the line segment b7-b8) and the crest gap Cso of the external thread (the width of the gap, the distance between the line segment b1-b2 and the line segment b3-b4). It can be set to be larger (wider) than at least one of them.
- cap member CAP ⁇ Embodiment of cap member CAP> Next, an embodiment of the cap member CAP will be described with reference to FIG.
- the cap member CAP has a disk shape with a hole in the center, is in sliding contact with the first cylinder portion Et1 (cylindrical shape) of the pressing member PSN at the outer peripheral portion, and is the second cylindrical portion of the shaft member SFT at the inner peripheral portion. It is in sliding contact with Et2 (cylindrical shape).
- the cap member CAP is capable of linear movement in the axial direction with respect to the pressing member PSN and the shaft member SFT (movement of the PSN in the axis Jps direction and the SFT in the axis Jsf direction), and the pressing member PSN. , And relative rotation around at least one of the shaft members SFT (rotation around at least one of the axes around Jps and Jsf) is possible.
- the cap member CAP prevents the lubricant GRS from flowing out from the storage chamber Hch (for example, position Pb3) to the external position Pb4, and gas (air) flows from the position Pb4 to the storage chamber Hch (for example, position Pb3). It functions as a lid (cap) for preventing this.
- the gap Csf between the second cylinder part Et2 and the cap member CAP can be set larger than the gap Cps between the first cylinder part Et1 and the cap member CAP. Since the shaft member SFT is rotated, the relative rotational sliding between the cap member CAP and the SFT can be performed in the second cylindrical portion Et2. Since the gap Csf (the gap between CAP and SFT) is set to be relatively large, the sliding resistance of rotation can be reduced. When rotational sliding is permitted in the second cylindrical portion Et2, it is not necessary to perform rotational sliding in the first cylindrical portion Et1. For this reason, the gap Cps (the gap between CAP and PSN) can be set relatively narrow.
- the cap member CAP can be suppressed from being inclined with respect to the pressing member PSN and the shaft member SFT. Further, a key member KYB and a key groove to be fitted with the key member KYB are provided between the pressing member PSN and the cap member CAP, and relative rotational movement between the cap member CAP and the pressing member PSN (Et1) is performed. Can be limited. Thereby, the effect of suppressing the inclination of the cap member CAP can be increased.
- the volume of the storage chamber Hch is changed.
- the sealed chamber Hmp is provided at the end of the screw member NJB (on the side opposite to the Hch) (on the side opposite to the Hch), the volume of the sealed chamber Hmp also changes. Furthermore, since the volume of the sealed chamber Hmp changes, the lubricant GRS flows into or out of the storage chamber Hch via the screw member NJB.
- the cap member CAP Since the cap member CAP is slidable in the axial direction with the first cylinder portion Et1 (the inner peripheral portion of the pressing member PSN) and the second cylinder portion Et2 (the outer peripheral portion of the shaft member SFT), the cap member CAP The movement (slide) absorbs the movement of the lubricant GRS due to the volume change and the volume change of the sealed chamber Hmp.
- volume change occurs in a series of braking operations (operations from generation of braking torque to cancellation in one braking).
- This volume change is caused by the caliper CPR and the rigidity of the friction member MSB.
- the volume change can also occur due to wear of the friction member MSB over time. Although the volume change due to the braking operation is relatively small, the volume change due to wear over time is larger than the change due to the braking operation.
- the cap member CAP can also absorb the movement of the lubricant GRS due to the volume change based on the wear of the friction member MSB.
- FIG. 7 corresponds to FIG. Therefore, in FIG. 7, the same symbols as those in FIG. 2 are given to members that exhibit the same or equivalent functions as the members shown in FIG. 2.
- the bolt member BLT is fixed to the pressing member PSN
- the nut member NUT is fixed to the shaft member SFT
- the bolt member BLT is fixed to the shaft member SFT.
- the cap member CAP is inscribed in the first tube portion Et1 of the pressing member PSN and is in contact with the second tube portion Et2 of the shaft member SFT.
- the cap member CAP is slid with the first cylinder part Et1 in the axial (Jps, Jsf) direction, and is slid with the second cylinder part Et2 in the axial direction and around the axis.
- the universal joint UNV is provided between the input member INP and the shaft member SFT in order to maintain the slidability between the cap member CAP and the first and second cylinder portions Et1 and Et2.
- a sealed chamber Hmp is formed at the end of the pressing member PSN (for example, the wall Mp1) and the screw member NJB.
- the storage chamber Hch is formed by the pressing member PSN (for example, the inner peripheral portion Et1), the screw member NJB, and the cap member CAP.
- a lubricant (grease) GRS is applied to the screw member NJB, and the sealed chamber Hmp and the storage chamber Hch are also filled with the lubricant GRS.
- the same operations and effects as the first embodiment described above are exhibited. That is, since the storage chamber Hch is formed by the cap member CAP, gas intrusion into the screw member NJB (particularly at the position Pa2) can be suppressed. Further, since the sealed chamber Hmp is formed at the end portion (position Pa1) of the screw member NJB, gas intrusion from here is prevented. Furthermore, the lubricant (grease) GRS is updated through the gap of the screw member NJB due to the volume change of the sealed chamber Hmp due to the braking operation. As a result, the lubrication state of the screw member NJB can be appropriately maintained.
- FIG. 8 (i) corresponds to FIG. 5 (a) and shows a state (press contact state) where the pressing member PSN presses the friction member MSB.
- the ball screw nut member NUTb is rotationally driven by the electric motor MTR, and the ball screw shaft member BLTb fixed to the pressing member PSN is linearly moved.
- the NUTb presses the BAL at the first contact portion Ba1 in the direction of the arrow, and the force is transmitted to the BLTb at the first contact portion Bb1.
- the first contact portions Ba1 and Bb1 that come into contact when the PSN is pressing the MSB are referred to as “pressure-side contact portions during pressing”.
- the second contact portions Ba2 and Bb2 that are located on the side opposite to the first contact portions Ba1 and Bb1 and contact when the screw is pulled back are referred to as “play-side contact portions during pressing”. .
- FIG. 8 (ii) corresponds to FIG. 5 (c) and shows a state in which the screw member NJB is pulled back (withdrawal contact state).
- NUTb presses the ball BAL at the second contact portion Ba2
- BAL presses the BLTb at the second contact portion Bb2 by the force.
- the ball BAL enters a free state (free contact state) in which no reaction force is received from the ball grooves MZN and MZB.
- the contact state between the ball (steel ball) BAL and the ball grooves MZN and MZB is gradually changed by the pull back operation of the screw. That is, in the ball screw as well as the trapezoidal screw, the state changes from the pressed contact state to the pull back contact state through the free contact state.
- the lubricant (grease) GRS between the ball BAL and the ball grooves MZN and MZB is moved by the transition of the contact state (for example, switching of the contact state), and the braking torque
- the lubrication state between the first contact portions Ba1 and Bb1 in the case where the increase is increased is renewed.
- the supply of new lubricant (grease) to the contact portions Ba1 and Bb1 starts in the free contact state and is completed in the pull back contact state. Therefore, new lubricant GRS can be supplied to the first contact portions Ba1 and Bb1, which are pressure-side contact portions at the time of pressing, by at least being brought into the free contact state.
- the lubricant GRS in a portion that is not used in normal braking operation moves to the screw member NJB, so that the lubrication state of the screw member NJB can be ensured.
- the ball (steel ball) BAL is prone to fatigue if force continues to act on the same part, but the BAL rolls by the pull back operation, so that the pressure receiving part is made uniform as a whole and the durability is improved. obtain.
- the friction member MSB is pressed against the rotating member KTB fixed to the wheel WHL of the vehicle via the electric motor MTR to generate a braking torque on the wheel WHL.
- pressing member PSN that presses the friction member MSB against the rotating member KTB and has a first tube portion Et1 on the inner periphery
- a shaft member SFT that is rotationally driven by the electric motor MTR and has a second cylinder portion Et2 that is axially overlapped with the first cylinder portion Et1” on the outer periphery
- Screw member NJB that converts the rotational movement of the shaft member SFT into the linear movement of the pressing member PSN”
- slidingably contacted with the first tube portion Et1 on the outer periphery and can be moved relative to the pressing member PSN in the axial direction (Jps direction) of the pressing member PSN, and slidably contacted with the second tube portion Et2 on the inner periphery.
- the shaft member SFT is relatively movable in the axial direction (Jsf direction) of the shaft member SFT, and the at least one of the first tube portion Et1 and the second tube portion Et2 is A cap member CAP capable of relative rotation around the axis of the shaft member SFT (around Jsf); “Lubricant GRS that is partitioned by the first cylinder part Et1, the second cylinder part Et2, and the cap member CAP, is connected to one ends Pa2 and Pb2 of the screw member NJB, and lubricates the screw member NJB.
- a storage chamber Hch to be filled.
- the main cause of the deterioration of the lubrication state of the screw member NJB is that gas (air) enters the contact portion of the screw member NJB where power is transmitted (for example, the gap between the flank of the internal thread and the flank of the external thread). This is because the lubricant (grease) in the contact portion is depleted. Therefore, the inflow of gas to the contact portion of the screw portion NJB is suppressed and the lubricant is sufficiently supplied, so that the lubrication state of the screw member NJB can be properly maintained.
- the end of the screw member NJB is provided with a storage chamber Hch that is a partitioned space for storing the lubricant (grease) GRS, and the storage chamber Hch is lubricated.
- the agent GRS is filled.
- the storage chamber Hch is partitioned by a cap member CAP whose outer periphery is in sliding contact with the first cylindrical portion (for example, cylindrical shape) Et1, and whose inner periphery is in sliding contact with the second cylindrical portion (for example, cylindrical shape) Et2.
- the space (storage chamber Hch) partitioned in this way the gas is removed as much as possible and the lubricant GRS is filled.
- the slidable contact portion between the cap member CAP and Et1 and Et2 can be a gas inflow path, but these portions have a cylindrical shape (a shape having a busbar) constituted by straight lines. That is, since the surface is sealed (surface seal) and the surface is formed by a linear assembly, the lubricant GRS can be enclosed with high sealing performance.
- the sealing device described in Patent Document 3 described above the sealing is performed at the ball groove portion (that is, the sealing portion is formed with a curve).
- the pressing member PSN is moved in the axial (Jps) direction.
- This movement causes the screw member NJB to move forward or backward, and a volume change can occur in the storage chamber Hch.
- the friction member (brake pad) MSB gradually wears as it continues to be used. This wear (reduction in the thickness of the friction member MSB) can also cause a change in the volume of the storage chamber Hch.
- the cap member CAP has an axis (Jps,) with respect to the first cylindrical portion (inner peripheral shape of the pressing member PSN) Et1 and the second cylindrical portion (outer peripheral shape of the shaft member SFT) Et2. This volume change can be absorbed because it slides in the Jsf) direction. As a result, the sealing state by the cap member CAP can be favorably maintained for a long time.
- the universal joint mechanism UNV is disposed between the input member INP and the shaft member SFT.
- the shaft misalignment that may occur due to the caliper CPR bending, the friction member (brake pad) MSB uneven wear, or the like is provided between the input member INP and the shaft member SFT. Can be absorbed by the universal joint UNV. Therefore, the axial displacement between the pressing member PSN and the shaft member SFT cannot occur.
- the PSN axis (pressing axis) Jps and the SFT axis (shaft axis) Jsf are always coaxial. As a result, since the parallel degree between the first cylinder portion Et1 and the second cylinder portion Et2 is maintained, smooth sliding of the cap member CAP with respect to Et1 and Et2 can be ensured.
- a sealed chamber Hmp connected to the screw member NJB on the side opposite to the storage chamber Hch with respect to the screw member NJB and filled with the lubricant GRS is provided”.
- the sliding gap Csf between the cap member CAP and the second cylinder part Et2 is larger than the sliding gap Cps between the cap member CAP and the first cylinder part Et1.
- the cap member CAP is restricted from rotating around the axis of the pressing member PSN (around Jps).
- the cap member CAP In order to absorb the volume change in the storage chamber Hch, the cap member CAP is slid in the axial direction. However, when the cap member CAP is tilted, the sliding in the axial direction of the first cylinder part Et1 and the second cylinder part Et2 is hindered. According to the above configuration, the gap between the second cylindrical portion Et2 and the cap member CAP is set large, and relative movement in the rotational direction (axial direction) and the axial direction (direction parallel to the axis) can be facilitated. . In addition, the gap between the first tube portion Et1 and the cap member CAP is set to be relatively small, and the inclination of the cap member CAP can be suppressed. Further, the relative rotational movement between the first tube portion Et1 and the cap member CAP is restricted by the key member, whereby the inclination of the cap member CAP can be suppressed.
- the friction member MSB is pressed against the rotating member KTB fixed to the wheel WHL of the vehicle via the electric motor MTR to generate a braking torque on the wheel WHL.
- the sealed chamber Hmp filled with the lubricant (grease) GRS is provided at one end portion Pb1 of the screw member NJB.
- the rotational motion is converted into a linear motion by the screw member NJB.
- the linear change of the screw member NJB causes a volume change (increase or decrease in volume) in the sealed chamber Hmp.
- the screw member NJB is provided with a screw gap (a trapezoidal screw flank gap Cfk, a ball screw groove gap Cmn, Cms, or the like). Since the lubricant GRS is sealed and filled in the sealed chamber Hmp, the lubricant GRS inside the screw member NJB is moved by this volume change.
- the lubricant GRS moves from the sealed chamber Hmp to the screw member NJB. Conversely, when the volume of the sealed chamber Hmp increases, the lubricant GRS moves from the screw member NJB to the sealed chamber Hmp. Due to the movement of the lubricant, the lubricant is renewed in the screw member NJB, and a good lubrication state of the screw member NJB can be maintained over a long period of time.
- the pressing member PSN has a cup shape, and the pressing member PSN is overlapped with the shaft member SFT so as to enclose the shaft member SFT.
- the other end Pb2 of the screw member NJB is provided with a storage chamber Hch that is partitioned by a first cylindrical portion (inner wall) Et1 of the pressing member PSN.
- the inside of the storage chamber Hch is filled with the lubricant GRS.
- the lubricant GRS in the screw member NJB moves due to the volume change of the sealed chamber Hmp, while the storage chamber Hch in which the end of the screw member NJB on the opposite side of the sealed chamber Hmp is filled with the GRS. Provided. For this reason, it can suppress that gas (air) flows in into screw member NJB. In particular, when the volume of the sealed chamber Hmp increases, it can be suppressed that gas flows in from the end portions (parts Pb2, Pa2) of the screw member NJB. For this reason, depletion of the lubricant GRS can be prevented in the screw member NJB.
- the shaft member SFT is relatively movable in the axial direction (Jsf direction) of the shaft member SFT, and is at least one of the first tube portion Et1 and the second tube portion Et2.
- a cap member CAP capable of relative rotation around the axis of the shaft member SFT (around Jsf) is provided, and the storage chamber Hch is covered by the cap member CAP.
- each of the sliding contact portions of the cap member CAP, the inner wall Et1 of PSN, and the outer wall Et2 of SFT serves as a gas inflow path from the gas chamber (parts Pb4, Pa4).
- it is made into the cylinder shape (shape with a bus-bar) comprised with a straight line. That is, since the surface is sealed (surface seal) and the surface is formed by a linear assembly, the lubricant GRS can be enclosed with high sealing performance.
- sealing device described in Patent Document 3 sealing is performed at the ball groove portion (that is, the sealing portion is formed with a curve).
- the screw member NJB is composed of a male screw ONJ and a female screw MNJ, and a flank gap Cfk between the male screw ONJ and the female screw MNJ is set to the male screw ONJ, And it is set larger than at least one crest gap Csm, Cso of the female thread MNJ.
- flanks In the trapezoidal screw composed of male screw ONJ and female screw MNJ, power transmission is performed by flanks. According to the above configuration, since the flank gap Cfk is set to be larger than the summit gaps Csm and Cso, the lubricant GRS due to the volume change of the sealed chamber Hmp is moved mainly using the flank gap Cfk as a flow path. For this reason, the renewal of the lubricant in the flank as the power transmission surface can be effectively performed.
- FIG. 9 corresponds to FIG. Accordingly, in FIG. 9, members that perform the same or equivalent functions as the members shown in FIG. 2 are given the same symbols as in FIG. 2.
- the bolt member BLT is fixed to the pressing member PSN and the nut member NUT is fixed to the shaft member SFT, whereas in the second embodiment, the nut member NUT is the pressing member.
- the bolt member BLT is fixed to the shaft member SFT.
- a cylindrical (cup-shaped) cylinder member CLN is fixed to the pressing member PSN, and a nut member NUT is fixed to the inside (inner peripheral portion Et5) of the cylinder member CLN.
- the bolt member BLT is fixed to the inside (partition wall Mp3) of the shaft member SFT coaxially with the shaft (shaft shaft) Jsf of the shaft member.
- the nut member NUT fixed to the pressing member PSN and the bolt member BLT fixed to the shaft member SFT are screwed together to constitute the screw member NJB.
- a sealed chamber Hmp is formed in one end portion Pc1 of the screw member NJB after the gas is removed and sealed with the lubricant GRS.
- the sealed chamber Hmp is a dead end by being partitioned by the inner wall Et5 of the cylinder member CLN and the partition wall Mp4. For this reason, the entrance / exit of the lubricant GRS inside the sealed chamber Hmp is limited to the gap (screw gap) of the screw member NJB.
- the lubricant GRS is moved between the front and rear of the screw member NJB (between the parts Pc1 and Pc2) by changing the volume in the sealed chamber Hmp by the movement of the pressing member PSN with respect to the rotating member KTB. Specifically, when the pressing member PSN moves forward toward the rotating member KTB, the volume of the sealed chamber Hmp increases, and the lubricant GRS flows into the screw member NJB from the site Pc2 and from the site Pc1 to the sealed chamber. Outflow to Hmp.
- the volume of the sealed chamber Hmp decreases, and the lubricant GRS flows from the part Pc1 into the screw member NJB and is moved from the screw member NJB to the part Pc2. . Due to the volume change in the sealed chamber Hmp, the lubricant GRS in the screw member NJB is moved to update the lubricant (grease) GRS.
- a cap member CAP is provided which is inscribed in the first cylinder portion Et1 of the pressing member PSN and circumscribed in the second cylinder portion Et2 of the shaft member SFT. obtain.
- a storage chamber Hch in which the lubricant GRS is stored is formed by being partitioned by the pressing member PSN (for example, Et1), the screw member NJB, and the cap member CAP.
- the same operations and effects as the first embodiment described above are exhibited.
- the portion (overlap portion) Ovp where the pressing member PSN (Et1) and the shaft member SFT (Et2) overlap is provided, from the screw member NJB to the gas portion (portion where the gas exists, the portion Pc5)
- the path through which the gas passes (filled with the lubricant GRS during this period) can be set long without extending the overall length of the braking means BRK.
- the end portion Pc4 of the storage chamber Hch is partitioned by the cap member CAP, the intrusion of gas into the storage chamber Hch can be suppressed.
- the sealed chamber Hmp is formed at the end (part Pc1) opposite to the storage chamber Hch of the screw member NJB, the volume change of the sealed chamber Hmp due to the braking operation causes the gap between the screw members NJB.
- the lubricant (grease) GRS is updated. As a result, the lubrication state of the screw member NJB can be appropriately maintained.
- the friction member MSB is pressed against the rotating member KTB fixed to the wheel WHL of the vehicle via the electric motor MTR to generate a braking torque on the wheel WHL.
- the pressing member PSN has a first tube portion Et1 on the inner periphery
- the shaft member SFT has a cylindrical second tube portion Et2 on the outer periphery.
- the first tube portion Et1 and the second tube portion Et2 have overlapping portions (overlap portions), are inserted so as to face each other, and are filled with a lubricant (grease) GRS. That is, the inner diameter of the first cylinder part Et1 is larger than the outer diameter of the second cylinder part Et2, and the respective openings Kk1 and Kk3 are faced and combined to form an overlap part Ovp. And this overlap part Ovp is filled with lubricant GRS.
- the main cause of the deterioration of the lubrication state of the screw member NJB is that gas (air) enters the contact portion of the screw member NJB where power is transmitted (for example, the gap between the flank of the internal thread and the flank of the external thread). This is because the lubricant (grease) in the contact portion is depleted.
- the shaft member SFT is inserted into the deep portion of the pressing member (piston) PSN and configured to have an overlap (overlapping portion).
- the path through which the gas passes from the screw member NJB to the gas portion (portion (space) where the gas exists, for example, the portions Pb4 and Pc5). (For example, the path through which gas passes from the end portion Pb2 of the screw member to the gas portion Pb4) can be sufficiently ensured. As a result, invasion of gas (air) from the gas portion to the screw portion NJB is suppressed, and the lubrication of the screw member NJB can be maintained well over a long period of time.
- the shaft member SFT is relatively movable in the axial direction (Jsf direction) of the shaft member SFT, and is at least one of the first tube portion Et1 and the second tube portion Et2.
- a cap member CAP that is capable of relative rotation around the axis of the shaft member SFT (around Jsf) is provided.
- the storage chamber Hch is covered with the cap member CAP.
- the storage chamber Hch is partitioned by the cap member CAP, inflow of gas from the outside of the storage chamber Hch can be suppressed.
- the sliding contact portion between the cap member CAP and Et1 and Et2 serves as an inflow path of gas from the gas portions (parts Pb4 and Pc5).
- Shape That is, since the surface is sealed (surface seal) and the surface is formed by a linear assembly, the lubricant GRS can be enclosed with high sealing performance.
- sealing device described in Patent Document 3 sealing is performed at the ball groove portion (that is, the sealing portion is formed with a curve).
- the pressing member PSN is moved in the axial (Jps) direction.
- This movement causes the screw member NJB to move forward or backward, and a volume change can occur in the storage chamber Hch.
- the friction member (brake pad) MSB gradually wears as it continues to be used. This wear (reduction in the thickness of the friction member MSB) can also cause a change in the volume of the storage chamber Hch. Since the cap member CAP slides in the axial direction with respect to the first tube portion (inner peripheral shape of the pressing member PSN) Et1 and the second tube portion (outer peripheral shape of the shaft member SFT) Et2, this volume change is caused. It is absorbed and the sealing state by the cap member CAP can be maintained well.
- the universal joint mechanism UNV is disposed between the input member INP and the shaft member SFT.
- the shaft misalignment that may occur due to the caliper CPR bending, the friction member (brake pad) MSB uneven wear, or the like is provided between the input member INP and the shaft member SFT. Can be absorbed by the universal joint UNV. Therefore, the axial displacement between the pressing member PSN and the shaft member SFT cannot occur.
- the PSN axis (pressing axis) Jps and the SFT axis (shaft axis) Jsf are always coaxial. As a result, since the parallel degree between the first cylinder portion Et1 and the second cylinder portion Et2 is maintained, smooth sliding of the cap member CAP with respect to Et1 and Et2 can be ensured.
- a sealed chamber Hmp connected to the screw member NJB on the side opposite to the storage chamber Hch with respect to the screw member NJB and filled with the lubricant GRS is provided”.
- MSB friction member, KTB ... rotating member, PSN ... pressing member, MTR ... electric motor, SFT ... shaft member, NJB ... screw member, CAP ... cap member, Hch ... storage chamber, Et1 ... first cylinder part, Et2 ... first 2 cylinder parts, Et3 ... 3rd cylinder part, GRS ... Lubricant
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Abstract
Description
図1に示すように、この電動制動装置を備える車両には、制動操作部材BP、電子制御ユニットECU、制動手段(ブレーキアクチュエータ)BRK、及び、蓄電池BATが備えられている。
制御手段CTLは、目標押圧力演算ブロックFBT、指示通電量演算ブロックIST、押圧力フィードバック制御ブロックIPT、引き戻し制御ブロックHMC、及び、通電量調整演算ブロックIMTにて構成される。制御手段(制御プログラム)CTLは、電子制御ユニットECU内にプログラムされている。
当接解除パタンでは、ねじの当接状態が、押圧当接状態→自由当接状態へ遷移する。
当接解除パタンでは、ねじの第1当接部の当接(接触)が解除されて、第1当接部が自由状態となるまで、ねじが引き戻される。その後、ねじが、非制動時の待機位置に移動される。
当接切り替えパタンでは、ねじの当接状態が、(押圧当接状態→)自由当接状態→引き戻し当接状態へ遷移する。
当接切り替えパタンでは、ねじが自由当接状態を経て、押圧当接状態時とは異なる部位(第2当接部)が当接するまで、ねじが引き戻される。台形ねじの場合、押圧当接状態にて当接していたフランク(押圧時圧力側フランクであって、第1フランク)とは反対側のフランク(押圧時遊び側フランクであって、第2フランク)が当接するまで引き戻される。その後、ねじが、非制動時の待機位置に移動される。
限界引き戻しパタンでは、ねじの当接状態が、(押圧当接状態→)自由当接状態→引き戻し当接状態へ遷移する。
限界引き戻しパタンでは、前記当接部が切り替えられる状態を経て、ねじの螺合可能の限界部位まで、ねじが引き戻される。例えば、ねじ部材NJBにおいて、ストッパにて動きが制限されるまで、ねじが引き戻される。その後、ねじが、非制動時の待機位置に移動される。
制動手段BRKは、ブレーキキャリパ(浮動型キャリパ)CPR、回転部材(例えば、ブレーキディスク)KTB、摩擦部材(例えば、ブレーキパッド)MSB、電気モータ(ブラシモータ、又は、ブラシレスモータ)MTR、駆動手段(電気モータMTRの駆動回路)DRV、減速機GSK、入力部材INP、シャフト部材SFT、ねじ部材NJB、押圧部材(ブレーキピストン)PSN、キー部材KYA、位置検出手段MKA、通電量取得手段IMA、及び、押圧力取得手段FBAにて構成されている。
次に、図2を参照しながら、制動手段(ブレーキアクチュエータ)BRKの第1の実施形態について説明する。この図2は、図1に対応する。図2において、電気モータMTR、減速機GSK、押圧部材(ブレーキピストン)CPR等は、図1と同一であるため、これらの記載が省略されている。
次に、図3、及び、図4を参照しながら、ねじ部材NJB(特に、ねじの形状)について説明する。ねじ部材NJBは、台形ねじであり、めねじMNJと、おねじONJとで構成される。
次に、図5を参照しながら、先ず、上述した引き戻し作動における、ねじの当接状態(フランクの当接状態)、及び、当接状態の変化によって生じる潤滑剤(グリス)の移動について説明する。ここで、潤滑剤(グリス)GRSの移動に関し、範囲Xで示すねじの1ピッチ分の移動について説明する。
次に、図6を参照しながら、キャップ部材CAPの実施形態について説明する。
次に、図7を参照しながら、制動手段(ブレーキアクチュエータ)BRKの第2の実施形態について説明する。図7は、図2に対応している。従って、図7において、図2に示す部材と同じ、或いは同等の機能を発揮する部材については、図2と同じ記号が付されている。上述した第1の実施形態(図2を参照)では、ボルト部材BLTが押圧部材PSNに固定され、ナット部材NUTがシャフト部材SFTに固定されているのに対し、この第2の実施形態では、ナット部材NUTが押圧部材PSNに固定され、ボルト部材BLTがシャフト部材SFTに固定されている。キャップ部材CAPは、押圧部材PSNの第1筒部Et1に内接され、シャフト部材SFTの第2筒部Et2に外接される。キャップ部材CAPは、軸(Jps、Jsf)方向に第1筒部Et1と摺動され、軸方向及び軸まわりに第2筒部Et2と摺動される。キャップ部材CAPと第1筒部Et1、第2筒部Et2との摺動性が維持され得るために、自在継手UNVが、入力部材INPとシャフト部材SFTとの間に設けられる。押圧部材PSN(例えば、壁Mp1)、及び、ねじ部材NJBの端部にて、密閉室Hmpが形成される。また、押圧部材PSN(例えば、内周部Et1)、ねじ部材NJB、及び、キャップ部材CAPにて、貯蔵室Hchが形成される。そして、ねじ部材NJBには潤滑剤(グリス)GRSが塗布され、密閉室Hmp、及び、貯蔵室Hchにも潤滑剤GRSが充填される。
以上の説明では、ねじ部材NJBとして、台形ねじが採用される場合について説明してきた。これに対し、図8に示すように、ねじ部材NJBとして、ボールねじが採用され得る。ボールねじが採用される場合においても、台形ねじの場合と同様に、ボールねじの隙間が潤滑剤(グリス)GRSの流路として機能し得る。具体的には、上述の密閉室Hmpの体積変化に起因する潤滑剤GRSの移動が、ボールねじナット部材NUTb(上記のナット部材NUTに相当)と、ボールねじシャフト部材BLTb(上記のボルト部材BLTに相当)との隙間Cns(Csm、Csoに相当)、NUTbのボール溝MZNとボール(鋼球)BALとの隙間Cmn(Cfkに相当)、及び、BLTbのボール溝MZBとボール(鋼球)BALとの隙間Cms(Cfkに相当)を介して行われる。
以下、本発明の実施形態の作用・効果について説明する。本発明に係わる車両の電動制動装置では、車両の車輪WHLに固定された回転部材KTBに、電気モータMTRを介して摩擦部材MSBを押圧し、前記車輪WHLに制動トルクを発生させる。そして、この装置は、
「前記摩擦部材MSBを前記回転部材KTBに押圧し、内周に第1筒部Et1を有する押圧部材PSN」と、
「前記電気モータMTRによって回転駆動され、外周に前記第1筒部Et1と軸方向にてオーバラップする第2筒部Et2を有するシャフト部材SFT」と、
「前記シャフト部材SFTの回転運動を前記押圧部材PSNの直線運動に変換するねじ部材NJB」と、
「前記第1筒部Et1と外周で摺接し、前記押圧部材PSNに対して前記押圧部材PSNの軸方向(Jps方向)に相対移動可能であり、前記第2筒部Et2と内周で摺接し、前記シャフト部材SFTに対して前記シャフト部材SFTの軸方向(Jsf方向)に相対移動可能であり、前記第1筒部Et1、及び、前記第2筒部Et2のうちの少なくとも一方に対して前記シャフト部材SFTの軸まわり(Jsfまわり)に相対回転が可能であるキャップ部材CAP」と、
「前記第1筒部Et1、前記第2筒部Et2、及び、前記キャップ部材CAPによって区画され、前記ねじ部材NJBの一方端Pa2、Pb2に接続され、前記ねじ部材NJBを潤滑する潤滑剤GRSが充填される貯蔵室Hch」と、を備える。
「前記電気モータMTRの回転運動を前記シャフト部材SFTに伝達する入力部材INP」と、
「前記入力部材INP、乃至、前記押圧部材PSNにある各部材の軸Jin、Jsf、Jpsについての偏心を吸収し、前記電気モータMTRの回転運動を前記押圧部材PSNに伝達する自在継手機構UNV」と、が備えられる。そして、前記自在継手機構UNVは、前記入力部材INPと前記シャフト部材SFTとの間に配置される。
「前記ねじ部材NJBに対して前記貯蔵室Hchとは反対側で前記ねじ部材NJBに接続され、前記潤滑剤GRSが密閉されて充填される密閉室Hmp」が備えられる。
以下、本発明の実施形態の作用・効果について説明する。本発明に係わる車両の電動制動装置では、車両の車輪WHLに固定された回転部材KTBに、電気モータMTRを介して摩擦部材MSBを押圧し、前記車輪WHLに制動トルクを発生させる。そして、この装置は、
「前記摩擦部材MSBを前記回転部材KTBに押圧する押圧部材PSN」と、
「前記電気モータMTRによって回転駆動されるシャフト部材SFT」と、
「前記シャフト部材SFTの回転運動を前記押圧部材PSNの直線運動に変換するねじ部材NJB」と、
「前記ねじ部材NJBの一方端Pb1に接続される密閉された空間であって、前記空間に前記ねじ部材NJBを潤滑する潤滑剤GRSが充填される密閉室Hmp」と、を備える。
前記潤滑剤GRSは、前記シャフト部材SFTの回転によって、前記ねじ部材NJBのねじ隙間Cfk、Csm、Cso、Cmn、Cms、Cnsを介して、前記密閉室Hmpと前記ねじ部材NJBとの間で移動する。
「前記第1筒部Et1と外周で摺接し、前記押圧部材PSNに対して前記押圧部材PSNの軸方向(Jps方向)に相対移動可能であり、前記第2筒部Et2と内周で摺接し、前記シャフト部材SFTに対して前記シャフト部材SFTの軸方向(Jsf方向)に相対移動可能であり、前記第1筒部Et1、及び、前記第2筒部Et2のうちの少なくとも一方に対して前記シャフト部材SFTの軸まわり(Jsfまわり)に相対回転が可能であるキャップ部材CAPが備えられる。前記貯蔵室Hchは、前記キャップ部材CAPによって蓋がれている。
次に、図9を参照しながら、上述したオーバラップ部Ovpが設けられる制動手段(ブレーキアクチュエータ)BRKの第2の実施形態について説明する。図9は、図2に対応している。従って、図9において、図2に示す部材と同じ、或いは同等の機能を発揮する部材については、図2と同じ記号が付されている。上述した第1の実施形態では、ボルト部材BLTが押圧部材PSNに固定され、ナット部材NUTがシャフト部材SFTに固定されているのに対し、この第2の実施形態では、ナット部材NUTが押圧部材PSNに固定され、ボルト部材BLTがシャフト部材SFTに固定されている。
以下、本発明の実施形態の作用・効果について説明する。本発明に係わる車両の電動制動装置では、車両の車輪WHLに固定された回転部材KTBに、電気モータMTRを介して摩擦部材MSBを押圧し、前記車輪WHLに制動トルクを発生させる。そして、この装置は、
「前記摩擦部材MSBを前記回転部材KTBに押圧し、内周に第1筒部Et1を有する押圧部材PSN」と、
「前記電気モータMTRによって回転駆動され、外周に前記第1筒部Et1と軸方向(Jsf方向)にてオーバラップする第2筒部Et2を有し、内周に第3筒部Et3を有するシャフト部材SFT」と、
「前記シャフト部材SFTの回転運動を前記押圧部材PSNの直線運動に変換し、前記第3筒部Et3の内側に配置されるねじ部材NJB」と、
「前記第1筒部Et1、及び、前記第2筒部Et2によって区画され、前記ねじ部材NJBの一方端Pb2、Pc2に接続され、前記ねじ部材NJBを潤滑する潤滑剤GRSが充填される貯蔵室Hch」と、を備える。
「前記第1筒部Et1と外周で摺接し、前記押圧部材PSNに対して前記押圧部材PSNの軸方向(Jps方向)に相対移動可能であり、前記第2筒部Et2と内周で摺接し、前記シャフト部材SFTに対して前記シャフト部材SFTの軸方向(Jsf方向)に相対移動可能であり、前記第1筒部Et1、及び、前記第2筒部Et2のうちの少なくとも一方に対して前記シャフト部材SFTの軸まわり(Jsfまわり)に相対回転が可能であるキャップ部材CAP」が備えられている。前記貯蔵室Hchは、前記キャップ部材CAPによって蓋がされている。
「前記電気モータMTRの回転運動を前記シャフト部材SFTに伝達する入力部材INP」と、
「前記入力部材INP、乃至、前記押圧部材PSNにある各部材の軸Jin、Jsf、Jpsについての偏心を吸収し、前記電気モータMTRの回転運動を前記押圧部材PSNに伝達する自在継手機構UNV」と、が備えられる。そして、前記自在継手機構UNVは、前記入力部材INPと前記シャフト部材SFTとの間に配置される。
「前記ねじ部材NJBに対して前記貯蔵室Hchとは反対側で前記ねじ部材NJBに接続され、前記潤滑剤GRSが密閉されて充填される密閉室Hmp」が備えられる。
Claims (6)
- 車両の車輪に固定された回転部材に、電気モータを介して摩擦部材を押圧し、前記車輪に制動トルクを発生させる車両の電動制動装置であって、
前記摩擦部材を前記回転部材に押圧し、内周に第1筒部を有する押圧部材と、
前記電気モータによって回転駆動され、外周に前記第1筒部と軸方向にてオーバラップする第2筒部を有するシャフト部材と、
前記シャフト部材の回転運動を前記押圧部材の直線運動に変換するねじ部材と、
前記第1筒部と外周で摺接し、前記押圧部材に対して前記押圧部材の軸方向に相対移動可能であり、前記第2筒部と内周で摺接し、前記シャフト部材に対して前記シャフト部材の軸方向に相対移動可能であり、前記第1筒部、及び、前記第2筒部のうちの少なくとも一方に対して前記シャフト部材の軸まわりに相対回転が可能であるキャップ部材と、
前記第1筒部、前記第2筒部、及び、前記キャップ部材によって区画され、前記ねじ部材の一方端に接続され、前記ねじ部材を潤滑する潤滑剤が充填される貯蔵室と、
を備えた、車両の電動制動装置。 - 請求項1に記載の車両の電動制動装置において、
前記押圧部材は、前記軸方向の一方側が開口し、前記軸方向の他方側が塞がれた内部空間を有するカップ形状を呈し、前記カップ形状の側壁部の内周面が前記第1筒部に対応し、
前記シャフト部材の一端部が、前記内部空間内に配置され、前記シャフト部材の前記一端部の外周面が前記第2筒部に対応し、
前記貯蔵室は、前記内部空間内における、前記キャップ部材に対して前記開口と反対側の部分に配置された、車両の電動制動装置。 - 車両の車輪に固定された回転部材に、電気モータを介して摩擦部材を押圧し、前記車輪に制動トルクを発生させる車両の電動制動装置であって、
前記摩擦部材を前記回転部材に押圧する押圧部材と、
前記電気モータによって回転駆動されるシャフト部材と、
前記シャフト部材の回転運動を前記押圧部材の直線運動に変換するねじ部材と、
前記ねじ部材の一方端に接続される密閉された空間であって、前記空間に前記ねじ部材を潤滑する潤滑剤が充填される密閉室と、
を備え、
前記潤滑剤は、前記シャフト部材の回転によって、前記ねじ部材のねじ隙間を介して、前記密閉室と前記ねじ部材との間で移動する、車両の電動制動装置。 - 請求項3に記載の車両の電動制動装置において、
前記押圧部材は、軸方向の一方側が開口し、前記軸方向の他方側が塞がれた内部空間を有するカップ形状を呈し、
前記シャフト部材の一端部が、前記内部空間内に配置され、
前記密閉室は、前記押圧部材の前記カップ形状の内側の壁面、又は、前記シャフト部材の前記一端部の壁面によって区画された、車両の電動制動装置。 - 車両の車輪に固定された回転部材に、電気モータを介して摩擦部材を押圧し、前記車輪に制動トルクを発生させる車両の電動制動装置であって、
前記摩擦部材を前記回転部材に押圧し、内周に第1筒部を有する押圧部材と、
前記電気モータによって回転駆動され、外周に前記第1筒部と軸方向にてオーバラップする第2筒部を有し、内周に第3筒部を有するシャフト部材と、
前記シャフト部材の回転運動を前記押圧部材の直線運動に変換し、前記第3筒部の内側に配置されるねじ部材と、
前記第1筒部、及び、前記第2筒部によって区画され、前記ねじ部材の一方端に接続され、前記ねじ部材を潤滑する潤滑剤が充填される貯蔵室と、
を備えた、車両の電動制動装置。 - 請求項5に記載の車両の電動制動装置において、
前記押圧部材は、前記軸方向の一方側が開口し、前記軸方向の他方側が塞がれた第1内部空間を有する第1カップ形状を呈し、前記第1カップ形状の側壁部の内周面が前記第1筒部に対応し、
前記シャフト部材の一端部が、前記第1内部空間内に配置され、
前記シャフト部材の前記一端部は、前記軸方向の端部が開口し、前記軸方向の前記端部と反対側が塞がれた第2内部空間を有する第2カップ形状を呈し、前記第2カップ形状の側壁部の外周面、及び、内周面がそれぞれ、前記第2筒部、及び、前記第3筒部に対応し、
前記貯蔵室は、前記第1内部空間内に配置され、
前記ねじ部材は、前記第2内部空間内に配置された、車両の電動制動装置。
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US11608045B2 (en) | 2020-09-16 | 2023-03-21 | Arvinmeritor Technology, Llc | System and method of checking sealing of a brake caliper housing |
US11718283B2 (en) | 2020-09-18 | 2023-08-08 | Arvinmeritor Technology, Llc | Brake assembly having a sensor |
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Also Published As
Publication number | Publication date |
---|---|
DE112014000559T5 (de) | 2015-10-22 |
DE112014000559B4 (de) | 2019-08-14 |
US20150362033A1 (en) | 2015-12-17 |
US9599177B2 (en) | 2017-03-21 |
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