WO2012127514A1 - ブレーキ装置 - Google Patents
ブレーキ装置 Download PDFInfo
- Publication number
- WO2012127514A1 WO2012127514A1 PCT/JP2011/001628 JP2011001628W WO2012127514A1 WO 2012127514 A1 WO2012127514 A1 WO 2012127514A1 JP 2011001628 W JP2011001628 W JP 2011001628W WO 2012127514 A1 WO2012127514 A1 WO 2012127514A1
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- WO
- WIPO (PCT)
- Prior art keywords
- piston
- brake
- nut
- movable
- piston member
- 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
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D65/00—Parts or details
- F16D65/38—Slack adjusters
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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
- F16D65/00—Parts or details
- F16D65/38—Slack adjusters
- F16D65/40—Slack adjusters mechanical
- F16D65/52—Slack adjusters mechanical self-acting in one direction for adjusting excessive play
- F16D65/56—Slack adjusters mechanical self-acting in one direction for adjusting excessive play with screw-thread and nut
- F16D65/567—Slack adjusters mechanical self-acting in one direction for adjusting excessive play with screw-thread and nut for mounting on a disc brake
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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
- F16D65/38—Slack adjusters
- F16D65/40—Slack adjusters mechanical
- F16D65/62—Slack adjusters mechanical self-acting in both directions for adjusting excessive and insufficient play
- F16D65/66—Slack adjusters mechanical self-acting in both directions for adjusting excessive and insufficient play with screw-thread 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
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D65/00—Parts or details
- F16D65/38—Slack adjusters
- F16D2065/386—Slack adjusters driven electrically
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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
- F16D2121/02—Fluid pressure
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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
- F16D2121/02—Fluid pressure
- F16D2121/04—Fluid pressure acting on a piston-type actuator, e.g. for liquid pressure
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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
- F16D2123/00—Multiple operation forces
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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
- F16D2125/22—Mechanical mechanisms converting rotation to linear movement or vice versa acting transversely to the axis of rotation
- F16D2125/26—Cranks
Definitions
- the movable component in the brake device can be adjusted to an appropriate position.
- a friction brake device includes two movable members that can be independently driven by different drive sources.
- the brake device is configured such that the first movable member presses the friction member by the first drive source, and the second movable member presses the friction member via the first movable member by the second drive source.
- the second movable member engages with the first movable member at the front portion thereof, for example, and presses the first movable member and the friction member, while at the time of releasing the brake, the second movable member is at the rear portion, for example. Then, the first movable member is engaged with the first movable member, and the first movable member is pulled back to the return position determined by the position of the second movable member.
- the brake device determines whether or not it is necessary to adjust the relative position of the second movable member with respect to the first movable member based on the wear amount of the friction member. When it is determined that it is necessary, the brake device performs the relative position adjustment by driving the second movable member at an appropriate timing thereafter.
- the drag of the brake can be reduced or prevented satisfactorily.
- the second movable member continues to stay at a certain position, the thickness of the first movable member with respect to the second movable member is increased by reducing the thickness due to wear of the friction member.
- the brake device may include a control unit for controlling driving of the second movable member.
- the control unit determines whether or not an adjustment permission condition related to the wear amount of the friction member is satisfied, and adjusts a relative position of the second movable member with respect to the first movable member when the condition is satisfied. Is acceptable.
- the control unit may determine that the adjustment permission condition is satisfied when the wear equivalent amount reflecting the wear amount of the friction member exceeds a threshold value.
- the control unit determines whether the adjustment permission condition is satisfied when the wear amount or the wear equivalent amount exceeds a threshold value with reference to the wear amount of the friction member or the wear equivalent amount reflecting the wear amount during the most recent operation of the second movable member. It may be determined that it has been established. For this purpose, the control unit may reset the wear amount or the wear equivalent amount when the second movable member is actuated, and may integrate the wear amount or the wear equivalent amount from that point. It is preferable that the control unit stores the wear amount or the wear equivalent amount in the memory when the IG is turned off, and continuously accumulates thereafter.
- the relative position adjustment may be an operation of operating the second drive source to bring the second movable member closer to the first movable member. In this case, a dedicated operation for position adjustment may be performed.
- the relative position adjustment is an operation in which the second movable member is moved closer to the first movable member by operating the second drive source, moving the second movable member forward, contacting the first movable member, and pulling it back. Good. In this case, it is preferable in that the relative position can be adjusted using normal braking and releasing operations by the second movable member.
- the brake device elastically applies an urging force in the opposite direction to the first movable member in accordance with the relative movement amount of the first movable member in the pressing direction with respect to the second movable member.
- a first movable member retracting mechanism including an urging member is provided. This retracting mechanism is formed between the first movable member and the second movable member. If it does in this way, with the elastic urging
- the first movable member pulling mechanism may include a support portion for supporting the biasing member.
- One end of the biasing member is attached to one of the first and second movable members, and the other end is attached to the support portion.
- the support portion is moved by the relative movement of the first and second movable members. It may be arranged so as to be able to contact the other of them. In this way, it is possible to relatively easily realize a configuration in which the urging force is increased when the first movable member moves forward relative to the second movable member, and the urging force is decreased when the first movable member moves backward.
- the first and second movable members may be provided with a clearance for the second movable member to move back from the first movable member in a non-contact manner in the moving direction of the first and second movable members. Since the two movable members do not engage with each other in the clearance, the second movable member can be driven with substantially no load. By discriminating between the unloaded state and the loaded state due to engagement, the engagement of the two movable members can be detected. This detection may be made based on a measured value of a motor current for driving the second movable member, or may be made based on a measured value of distortion of the first movable member or the second movable member, for example. Good.
- the brake device 10 includes a disk rotor 12 that rotates together with a wheel, a caliper (in the present embodiment, a floating caliper) 14 that is supported on a non-rotating member (not shown) so as to be relatively movable in a direction parallel to the rotation axis of the wheel. .
- the non-rotating member holds a pair of pads 16 as a friction member so as to be able to approach and separate from the friction surface 20 of the disk rotor 12.
- the caliper 14 is supported in a posture straddling the disk rotor 12 and the pair of pads 16, and includes a cylinder main body 26, a reaction portion 27, and a connecting portion 28 that connects them.
- a cylinder bore is formed in the cylinder body 26, and the piston 30 is fitted in a liquid-tight manner and slidable in the axial direction.
- a ring-shaped piston seal 32 is provided between the cylinder bore and the piston 30.
- the cylinder body 26, the piston 30 and the like constitute a brake cylinder 34, and a hydraulic pressure chamber 36 is formed on the retreat side of the piston 30 in the cylinder bore.
- the piston 30 and the components that can be integrally moved in the axial direction are sometimes collectively referred to as the “piston member 30”. That is, the piston member 30 is movable by the action of the brake fluid pressure, and is configured to press the friction member by advancing.
- Each of the pair of pads 16 includes a back plate 44 and a friction material 46 fixed to the back plate 44.
- the friction plate 46 is pressed against the disk rotor 12 when the back plate 44 closer to the piston member 30 in the pair of pads 16 is abutted and pressed by the piston member 30.
- the brake device 10 When the friction material 46 and the disk rotor 12 are frictionally engaged, the brake device 10 generates a braking force. The rotation of the wheel is suppressed by the braking force.
- a braking force is generated according to the pressing force of the friction material 46 against the disc rotor 12, and when the pressing force increases, the braking force that can act on the wheels also increases.
- the nut member 60 and the electric motor 68 are connected via a power transmission mechanism 64.
- the power transmission mechanism 64 includes a speed reducer 66 that decelerates the rotation output from the electric motor 68, for example.
- the power transmission mechanism 64 may include other rotation transmission mechanisms.
- the reduction gear 66 is interposed between the output shaft of the electric motor 68 and a rotation shaft (spindle) 70.
- the power transmission mechanism 64 includes a motion conversion mechanism, such as a screw mechanism, for converting rotation into linear motion.
- a motion conversion mechanism such as a screw mechanism
- the male screw portion 69A formed on the inner peripheral surface of the nut member 60 and the female screw portion 69B formed on the outer peripheral surface of the rotation shaft (spindle) 70 are screwed together, and the nut member 60 is linearly aligned with the rotation of the spindle 70. Moved to.
- the spindle 70 is held on the cylinder body 26 via a radial bearing and a thrust bearing so as to be relatively rotatable.
- a spring support portion 104 having a generally annular plate shape is disposed so as to be movable relative to the nut member 60 in the axial direction.
- the spring support 104 is a washer, for example.
- the spring 106 is held in a state where a set load is applied in a state where the spring support portion 104 is in contact with the set load defining portion 108.
- the set load is a load that compresses the spring 106.
- the set load is preferably set to a size that does not elastically deform when the piston member 30 is retracted as the nut member 60 is retracted (that is, the amount of compressive deformation of the spring 106 does not increase).
- the set load is set to a magnitude equal to or greater than a load (push-back load) corresponding to the sliding resistance between the piston member 30 and the cylinder body 26 (mainly the piston seal 32). In this way, when the nut member 60 is pulled back together with the piston member 30, the spring 106 can be quickly pulled back without further compression deformation.
- the set load defining portion 108 also functions as a mechanism for preventing the spring support portion 104 and the spring 106 from coming off.
- the set load defining portion 108 may be a member provided continuously in an annular shape around the entire outer periphery of the small diameter portion 92 or a member provided partially.
- a member provided by press-fitting into the nut member 60 or a member (for example, a plurality of pins and screws) provided by being tightened using a screw mechanism is held in a relatively non-movable state by a C-ring or the like. It is good also as a made member.
- the overhang portion 112 may be provided on the inner peripheral surface of the cylindrical portion of the piston member 30 in an annular manner or may be provided partially.
- a groove can be formed in the inner peripheral surface of the piston member 30, and it can be set as the C ring attached to the groove, or it can be set as the annular member inserted by press-fitting.
- the spring 106 has one end attached to the nut member 60 and the other end attached to the spring support portion 104, and the spring support portion 104 is moved by the relative movement between the piston member 30 and the nut member 60. 112).
- the spring 106 has one end attached to the piston member 30 and the other end attached to the spring support portion.
- the support portion is attached to the nut member 60 by relative movement between the piston member 30 and the nut member 60. It is also possible to arrange so that they can be brought into contact with each other.
- the nut member 60 can be pulled back by driving the motor 68 and can be pulled back together with the piston member 30, so that the same drag reduction effect can be expected.
- the piston member 30 can be pulled back well even when the parking brake is applied relatively strongly.
- the ECU 150 for example, a known in-vehicle electronic control unit can be adopted.
- the ECU 150 is configured as a microprocessor including a CPU, for example, and includes a ROM that stores various programs, a RAM that temporarily stores data, an input / output port, a communication port, and the like in addition to the CPU.
- a non-volatile memory that is communicably connected to the ECU 150 and that can write data from the ECU 150 and can read data from the ECU 150 is provided integrally or separately from the ECU 150.
- the hydraulic pressure source 38 and the hydraulic actuator 40 may be controlled based on a command from the same ECU 150 or may be controlled based on a command from a different ECU.
- the ECU 150 and another ECU are communicably connected via a CAN (Car Area Network).
- the hydraulic chamber 36 is depressurized by the hydraulic actuator 40.
- the piston member 30 can be pulled back to the initial position shown in FIG. 2 by the elastic force of the spring 106 in addition to the restoring force acting from the pad 16 and the piston seal 32.
- the piston member 30 is retracted depending on a restoring force corresponding to deformation of the caliper 14, the pad 16, and the piston seal 32 during braking.
- FIG. 4 is a diagram schematically showing the operating state of the parking brake in the brake device 10 according to the embodiment of the present invention.
- the ECU 150 drives the electric motor 68 in accordance with the driver's operation to advance the nut member 60.
- the piston member 30 is also pushed together with the nut member 60.
- the pad 16 is pressed against the disk rotor 12 by the advancement of the piston member 30.
- the electric motor 68 is stopped and the nut member 60 is held in that position.
- the parking brake locking operation is completed.
- the spring support portion 104 and the set load defining portion 108 are in contact with each other as in the initial state, and the spring 106 advances integrally with the nut member 60 while the set load is applied. To do.
- FIGS. 5 and 6 are diagrams schematically showing a parking brake releasing operation in the brake device 10 according to the embodiment of the present invention.
- the ECU 150 drives the electric motor 68 in the reverse direction to the parking brake locking operation described above to retract the nut member 60.
- the piston member 30 also retreats following the nut member 60 by the restoring force of the caliper 14, the pad 16, and the like.
- this restoring force is not necessarily large enough. Therefore, as shown in FIG. 5, the piston member 30 is temporarily stopped, while the nut member 60 is separated from the piston member 30 by the drive of the electric motor 68 and retracts independently.
- the load applied to the electric motor 68 becomes very small and can be regarded as substantially no load. Therefore, the current flowing through the electric motor 68 is very small. This state continues until the nut member 60 moves backward by the clearance G described above, and if the nut member 60 comes into contact with the piston member 30, the load on the motor increases. Therefore, the current value corresponding to the no-load state is appropriately obtained experimentally or empirically, and a threshold value slightly higher than the no-load current value is set. The ECU 150 compares this threshold value with the measured value of the current sensor 152, and can determine that the nut member 60 has contacted the piston member 30 when the measured value exceeds the threshold value.
- the spring support portion 104 of the nut member 6 contacts the overhanging portion 112 of the piston member 30. Then, due to the engagement between the spring support portion 104 and the overhang portion 112, the nut member 60 and the piston member 30 are retracted integrally by driving the electric motor 68. Thus, the piston member 30 can be pulled back to a desired position. For example, the nut member 60 and the piston member 30 can be retracted to the initial position shown in FIG.
- the return position of the nut member 60 can be adjusted when the parking brake is released.
- the ECU 150 completes the release operation of the parking brake when the measured value of the current sensor 152 exceeds the above threshold value or when a predetermined time has elapsed since exceeding the above threshold value, and the nut member 60 and the piston member 30. May be stopped.
- the nut member 60 can be stopped at an appropriate position according to the wear amount of the pad 16 at that time.
- the relative position of the piston member 30 with respect to the nut member 60 is also automatically adjusted appropriately.
- the parking brake is not used for a relatively long period of time and the hydraulic brake is frequently used during that period. If the electric brake unit is not operated, the nut member 60 continues to remain at the same position on the spindle 70. The nut member 60 maintains a fixed position with respect to the cylinder body 26. On the other hand, if the hydraulic brake is operated at a high frequency, the wear of the pad 16 proceeds accordingly. Then, the pad 16 becomes thin due to wear, and the distance between the contact surface of the pad 16 with the piston member 30 and the nut member 60 increases. The piston member 30 is pulled back to the position of the nut member 60 by the action of the spring 106 when the hydraulic brake was released last time. Therefore, the advance amount of the piston member 30 required for the next braking increases as the pad wears.
- the braking stroke of the piston member 30 increases as the wear of the pad 16 progresses. This is preferable from the viewpoint of sufficiently suppressing dragging when the brake is released, but excessive expansion of the braking stroke may affect the effectiveness of the brake and the brake feeling.
- the necessary advance amount required for braking the piston member 30 may exceed the upper limit determined by the structure of the relative movable amount of the piston member 30 with respect to the nut member 60.
- excessive expansion of the stroke of the piston member 30 is suppressed by moving the nut member 60 forward in some time.
- the retracting position of the piston member 30, that is, the advance start position can be moved forward to reduce the stroke of the piston member 30.
- the expansion of the stroke of the piston member 30 in a situation where the parking brake is not used for a relatively long period of time is suppressed. Can do.
- the ECU 150 determines whether or not an adjustment permission condition related to the wear amount of the pad 16 is satisfied.
- the wear amount may be an actual measurement value or a wear equivalent amount that reflects the wear amount.
- the ECU 150 generates a request for adjusting the relative position of the nut member 60 with respect to the piston member 30 by the electric motor 68 when the adjustment permission condition is satisfied.
- ECU 150 determines whether or not an adjustment execution condition is satisfied.
- ECU 150 drives nut member 60 to execute relative position adjustment when the adjustment execution condition is satisfied.
- This relative position adjustment process may include at least the following five processes. 1. Accumulate the amount of pad wear since the last parking brake operation. The pad wear amount is accumulated until the parking brake is operated or a relative position adjustment request is generated. In particular, even if the IG is turned off, the accumulated amount at that time is stored in the memory without being erased, and the accumulation is continued. 2. When the parking brake is operating, the integrated value of pad wear is reset. In other words, the integrated value of the pad wear amount is not reset until the parking brake is operated or the relative position adjustment is executed. 3. The relative position adjustment is permitted on condition that the integrated value of pad wear exceeds the set value. 4). When the predetermined condition is satisfied, the relative position adjustment is performed by automatically operating the parking brake even if the parking brake is not operated. This adjustment is performed by executing the normal lock operation and release operation of the parking brake. 5. After completing the relative position adjustment, clear the integrated value of pad wear.
- the brake device 10 may include a pad wear amount accumulation storage device, a pad wear limit estimation device, and a nut clearance adjustment device.
- ECU 150 may include a pad wear amount accumulation storage unit, a pad wear limit estimation unit, and a nut clearance adjustment unit.
- the pad wear amount accumulation storage device is a configuration for accumulating and storing data corresponding to the pad wear amount and resetting it as necessary, and executes the first process, the second process, and the fifth process. May be.
- the pad wear limit estimation device is configured to detect that an integrated amount corresponding to the pad wear amount during a period in which the parking brake is not used is equal to or greater than a set value, and to issue an adjustment request after the detection. May be executed.
- the nut clearance adjustment device is configured to perform an adjustment operation by determining the vehicle state when an adjustment request is issued, and may execute the fourth process.
- FIG. 7 is a flowchart for explaining the relative position adjustment processing according to the embodiment.
- the ECU 150 repeatedly executes this processing (for example, every calculation cycle of the ECU 150).
- the ECU 150 first executes a preliminary determination process (S10).
- the preliminary determination process is a preliminary determination process prior to the position adjustment between the nut member 60 and the piston member 30, and the wear amount is reset according to the determination result, or the wear amount is written and stored in a nonvolatile memory. including.
- the preliminary determination process is incorporated in the relative position adjustment process.
- the present invention is not limited to this, and the preliminary determination process may be executed in parallel or independently of the adjustment permission determination process and the adjustment execution process described later. An example of the preliminary determination process will be described in more detail with reference to FIG.
- the ECU 150 determines whether or not a position adjustment request for the nut member 60 and the piston member 30 has been generated in the previous or previous process (S12). For example, ECU 150 determines that there is a position adjustment request when a flag indicating a position adjustment request is on, and determines that there is no position adjustment request when the flag is off.
- the adjustment permission determination process is a process including updating the pad wear amount and determining whether or not the latest wear amount has exceeded a determination threshold value. When the wear amount exceeds the determination threshold value, ECU 150 generates a position adjustment request between nut member 60 and piston member 30. When the adjustment permission determination process is completed, the process illustrated in FIG. 7 ends. An example of the adjustment permission determination process will be described in more detail with reference to FIG.
- the adjustment execution process is a process including adjusting the positions of the nut member 60 and the piston member 30 by driving the electric motor 68.
- the adjustment execution process may further include a process of determining whether or not the timing is appropriate for the adjustment execution based on the vehicle state.
- the process illustrated in FIG. 7 ends. An example of the adjustment execution process will be described in more detail with reference to FIG.
- the relative position adjustment process shown in FIG. 7 incorporates both the adjustment permission determination process and the adjustment execution process, but is not limited to this.
- the ECU 150 may execute a first process including an adjustment permission determination process and a second process including an adjustment execution process in parallel.
- the first process may include determining whether there is a position adjustment request and performing an adjustment permission determination process when there is no request.
- the second process may include determining whether or not there is a position adjustment request and performing an adjustment execution process when there is a request.
- FIG. 8 is a flowchart for explaining the preliminary determination process (S10) according to the embodiment.
- the ECU 150 first reads the integrated value of the pad wear amount stored in the nonvolatile memory into the accompanying volatile memory (S20). It should be noted that it is sufficient to execute this reading process at the time of the initial preliminary determination process or the relative position adjustment process after the ECU 150 is started, and can be omitted in the subsequent processes.
- the ECU 150 determines whether the adjustment permission condition is satisfied (S32).
- the adjustment permission condition includes that the pad wear amount or wear equivalent amount updated by the integration process exceeds a threshold value, and may further include other conditions.
- the wear equivalent amount is, for example, a pad wear amount estimated value
- the ECU 150 determines whether or not the estimated value has exceeded a predetermined wear amount threshold value.
- the wear equivalent amount is an integrated value of the brake load, it is determined whether or not the integrated value exceeds a predetermined brake load threshold value.
- the wear equivalent amount is the cumulative number of IG on / off times, it is determined whether or not the number of times exceeds a predetermined number of times threshold.
- the ECU 150 When the adjustment permission condition is satisfied (Y in S32), the ECU 150 generates a position adjustment request between the nut member 60 and the piston member 30 (S34). For example, ECU 150 switches a flag indicating a position adjustment request from off to on. When the adjustment permission condition is not satisfied (N in S32), the ECU 150 ends the adjustment permission determination process. In this case, the flag indicating the position adjustment request is kept off.
- the ECU 150 ends the adjustment execution process as it is.
- the ECU 150 executes the position adjustment operation between the nut member 60 and the piston member 30 (S42).
- the position adjusting operation is preferably an operation in which the nut member 60 is advanced by the electric motor 68 and brought into contact with the piston member 30 to be pulled back, and as a result, the nut member 60 is brought closer to the piston member 30 than before the adjustment.
- the position adjusting operation may be an operation dedicated to adjusting the nut member 60 closer to the piston member 30 by the electric motor 68.
- the brake device 10 includes a sensor for detecting the stroke of the piston member 30, and the ECU 150 may determine the position adjustment amount of the nut member 60 using the detection result of the stroke sensor. Good.
- the ECU 150 When the adjustment is completed, the ECU 150 resets the integrated value of the pad wear amount (S44), and cancels the position adjustment request between the nut member 60 and the piston member 30 (S46). For example, ECU 150 switches a flag representing a position adjustment request from on to off. In this way, the ECU 150 can execute the adjustment operation at an appropriate timing after the position adjustment request between the nut member 60 and the piston member 30 is generated.
- the engagement state between the piston member 30 and the nut member 60 can be detected based on the current sensor 152 and the nut member 60 can be stopped.
- the piston member 30 and the nut member 60 can be retracted with the pad 16 as the retreat start position, and the piston member 30 and the nut member 60 can be stopped at an appropriate position with respect to the pad 16.
- automatic adjustment in a situation where the parking brake is used at an appropriate frequency, it can be expected that the braking stroke of the piston member 30 does not excessively increase and falls within an allowable range.
- the automatic adjustment associated with the parking brake operation will not function.
- the nut member 60 remains at the same position with respect to the spindle 70 and the cylinder body 26, and the braking stroke of the piston member 30 gradually increases in conjunction with pad wear.
- the ECU 150 performs a relative position adjustment operation that advances the electric motor 68 and the nut member 60 somewhat even without an instruction to operate the parking brake, thereby suppressing an excessive increase in the stroke of the piston member 30.
- the stroke of the piston member 30 can be kept within an appropriate range over time. In this way, brake drag can be reduced or prevented, and braking effectiveness and feeling can be appropriately maintained.
- a spring fixing portion 202 protruding inward in the radial direction is provided on the opening side of the cylindrical portion of the piston member 200, and the shaft with respect to the piston member 200 is positioned so as to sandwich the spring fixing portion 202.
- the spring support portion 204 is held so as to be relatively movable in the direction.
- the spring support portion 204 is a member formed in a hollow cylindrical shape, and projecting portions 206 and 208 that protrude outward in the radial direction are provided at both end portions in the axial direction.
- One end of the spring 210 is attached to the protrusion 206 on the front end side of the spring support portion 204, and the other end is attached to the spring fixing portion 202.
- the hydraulic pressure is supplied to the hydraulic pressure chamber 36 when the service brake is operated, and the piston member 200 moves forward relative to the nut member 220.
- the spring fixing portion 202 advances integrally with the piston member 200, so that the front end 206 of the spring support portion 204 and the spring fixing portion 202 are And the spring 210 is compressed.
- the piston member 200 advances, the pad 16 is pressed against the disc rotor 12 to generate a braking force, while a pulling force is applied to the piston member 200 from the spring 210. Due to this pulling force, the piston member 200 is returned to its original position when the service brake is released.
- the electric motor 68 When the parking brake is activated, the electric motor 68 is driven and the nut member 220 moves forward. When the front end of the nut member 220 pushes the back surface of the piston member 200, the piston member 200 is also pushed, and the piston member 200 is pushed against the pad 16 and the disk rotor 12. On the other hand, when the parking brake is released, the electric motor 68 is driven in the reverse direction, and the nut member 220 moves backward. When the step surface 226 of the nut member 220 contacts the front end 206 of the spring support portion 204, the piston member 200 is pulled back together with the nut member 220.
- a piston return mechanism including a spring can be formed between the rear end of the movable member and the piston member 30 in the same manner.
- a movable member driven by a motor and a power transmission mechanism can be used instead of the piston member 30 driven by hydraulic pressure.
- the movable component in the brake device can be adjusted to an appropriate position.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Braking Arrangements (AREA)
Abstract
Description
1.パーキングブレーキ最終動作時からのパッド摩耗量を積算する。パーキングブレーキが動作されるか、または相対位置調整要求が生じるまでパッド摩耗量を積算する。特にIGオフがされてもその時点での積算量を消去することなくメモリに格納し、積算を継続する。
2.パーキングブレーキ動作時にはパッド摩耗量の積算値をリセットする。言い換えれば、パーキングブレーキが動作されるか、または相対位置調整が実行されるまではパッド摩耗量の積算値はリセットされない。
3.パッド摩耗量の積算値が設定値を超えたことを条件として相対位置調整を許可する。
4.所定の条件が成立したときは、パーキングブレーキの操作がなされなくても自動的にパーキングブレーキを作動させて相対位置調整を実行する。この調整はパーキングブレーキの通常のロック動作及びリリース動作を実行することで行われる。
5.相対位置調整の完了後にパッド摩耗量の積算値をクリアする。
Claims (10)
- 車両のための摩擦ブレーキ装置であって、
ブレーキ液圧の作用により移動可能であり、前進により摩擦部材を押圧するよう構成されているピストン部材を備える液圧ブレーキ部と、
モータによりピストン移動方向に前記ピストン部材に相対的に移動可能であり、前進により前記ピストン部材を押圧するよう構成されているナット部材を備える電動ブレーキ部と、
前記ピストン部材の前記ナット部材に対する相対前進量に応じて弾性的に後退方向の付勢力を前記ピストン部材に作用させるよう配設されている付勢部材を備えるピストン戻し機構と、
前記モータを制御するための制御部と、を備え、
前記制御部は、前記摩擦部材の摩耗量に関連する調整許可条件が成立したか否かを判定し、該条件が成立したときに前記モータによる前記ナット部材の前記ピストン部材に対する相対位置調整を許容することを特徴とするブレーキ装置。 - 前記制御部は、前記摩擦部材の摩耗量を反映する摩耗相当量がしきい値を超えたときに前記許可条件が成立したと判定することを特徴とする請求項1に記載のブレーキ装置。
- 前記制御部は、前記電動ブレーキ部の直近の作動時における前記摩擦部材の摩耗量またはそれを反映する摩耗相当量を基準として該摩耗量または摩耗相当量がしきい値を超えたときに前記許可条件が成立したと判定することを特徴とする請求項1または2に記載のブレーキ装置。
- 前記制御部は、車両状態に基づく調整実行条件が成立したか否かを判定し、該条件が成立したときに前記相対位置調整を実行することを特徴とする請求項1から3のいずれかに記載のブレーキ装置。
- 前記電動ブレーキ部は、前記ナット部材を前記モータに連結しかつ該モータの停止中は前記ナット部材の位置を保持するよう構成されている動力伝達機構を含み、
前記相対位置調整は、前記電動ブレーキ部を作動させて前記ピストン部材に前記ナット部材を近づける動作であることを特徴とする請求項1から4のいずれかに記載のブレーキ装置。 - 前記相対位置調整は、前記電動ブレーキ部を作動させ、前記ナット部材を前進させ前記ピストン部材に当接させて引き戻すことにより前記ナット部材を前記ピストン部材に近づける動作であることを特徴とする請求項1から5のいずれかに記載のブレーキ装置。
- 前記付勢部材は一端が前記ピストン部材及び前記ナット部材のうち一方に他端が支持部に取り付けられており、該支持部は前記ピストン部材と前記ナット部材との相対移動によって前記ピストン部材及び前記ナット部材のうち他方に当接可能に配設されていることを特徴とする請求項1から6のいずれかに記載のブレーキ装置。
- 前記ナット部材と前記ピストン部材とは、前記ナット部材が前記ピストン部材から非接触に後退するためのクリアランスを前記ピストン移動方向に有して配設されていることを特徴とする請求項1から7のいずれかに記載のブレーキ装置。
- 摩擦部材に当接して押圧するための、第1駆動源によって駆動される第1可動部材と、
第1可動部材に当接して押圧することにより第1可動部材を摩擦部材に押圧するための、第1駆動源とは異なる第2駆動源によって駆動される第2可動部材と、
ブレーキ解除のために、第1可動部材と第2可動部材との係合によって摩擦部材への押圧方向とは反対方向に第1可動部材が引き戻されるよう第1可動部材と第2可動部材との間に形成されている第1可動部材引戻機構と、
第1可動部材に対する第2可動部材の第2駆動源による相対位置調整の要否を、摩擦部材の摩耗量に基づいて判定する制御部と、を備えることを特徴とするブレーキ装置。 - 前記第1可動部材引戻機構は、第2可動部材に対する第1可動部材の前記押圧方向の相対移動量に応じて前記反対方向の付勢力を弾性的に第1可動部材に作用させるための付勢部材を備えることを特徴とする請求項9に記載のブレーキ装置。
Priority Applications (5)
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US14/005,745 US8997947B2 (en) | 2011-03-18 | 2011-03-18 | Brake device |
JP2013505603A JP5472528B2 (ja) | 2011-03-18 | 2011-03-18 | ブレーキ装置 |
EP11861561.6A EP2687745B1 (en) | 2011-03-18 | 2011-03-18 | Brake device |
PCT/JP2011/001628 WO2012127514A1 (ja) | 2011-03-18 | 2011-03-18 | ブレーキ装置 |
CN201180069341.9A CN103443495B (zh) | 2011-03-18 | 2011-03-18 | 制动装置 |
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Also Published As
Publication number | Publication date |
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EP2687745A1 (en) | 2014-01-22 |
JPWO2012127514A1 (ja) | 2014-07-24 |
CN103443495A (zh) | 2013-12-11 |
EP2687745A4 (en) | 2014-10-08 |
CN103443495B (zh) | 2014-12-03 |
EP2687745B1 (en) | 2017-12-13 |
US8997947B2 (en) | 2015-04-07 |
JP5472528B2 (ja) | 2014-04-16 |
US20140000990A1 (en) | 2014-01-02 |
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