JP2007303679A - Regular combined parking brake - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a regular combined parking brake whose operation release due to cooling after stopping a vehicle is prevented by an energy accumulator connected thereto. <P>SOLUTION: The regular combined parking brake comprises operating devices 5, 9, 11, 12. The operating devices 5, 9, 11, 12 push a friction brake pad 3 against a turnable braking body 2 which intends to brake. The energy accumulator 20 loads the friction brake pad 3 to give braking force thereto. The energy accumulator 20 is connectable and disconnectable. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention is a service / parking brake, which is provided with an actuating device, and the actuating device presses the friction brake pad against a rotatable brake body to be braked. The energy storage is of a type adapted to load and brake the friction brake pads.

  A service and parking brake is known from WO 2004/041608. A known service and parking brake is a hydraulic automobile brake having a disc brake configuration. The known service and parking brake includes a hydraulically loadable brake piston, by which the friction brake pad is pressed against the brake disc for braking. In general, the brake disk forms a rotatable brake body to be braked. Service brakes are performed in a general manner by a hydraulic load on the brake piston.

  For parking brakes, known service and parking brakes are equipped with a screw transmission in the form of a spindle transmission, the nut of the screw transmission being attached to the brake piston, the spindle of the screw transmission being The brake caliper is pivotally supported and fixed in the axial direction. Since the screw transmission has a non-self-locking thread, the nut rotates the spindle during braking. The spindle includes a gear, and the gear can be fixed to the lock pin. The lock pin is actuated by an electromagnet, which together with the lock pin and gear forms a locking device for the spindle and screw transmission. In order to act as a parking brake, a known service and parking brake is actuated and locked in the actuated state.

  The known service and parking brake comprises a disc spring unit, which forms a spring force accumulator or energy accumulator. The disc spring unit loads the axial support of the spindle of the screw transmission, or the disc spring unit is arranged between the brake piston and the friction brake pad. With regard to the parking brake, before the spindle of the screw transmission device is fixed by the lock device, a preload is applied to the disc spring unit by the operation of the service and parking brake. The spring force of the disc spring unit to which the preload is applied presses the friction brake pad against the friction brake pad even in the non-pressurized service / parking brake, and the braking force exerted thereby is held as the parking brake force. The disc spring unit compensates for a change in length of the known service / parking brake due to heat generated when the service / parking brake is cooled after the vehicle stops, and the parking brake force is not canceled by the disk spring unit. The disc spring unit ensures a sufficient parking brake force when the service and parking brake is cooled.

In a known disc brake unit for a service and parking brake, a preload is applied in such a strength that it is not deformed between the service brakes in a starting state, that is, in a non-operating state of the brake. As a result, in the service brake, no hydraulic capacity is required to deform the disc spring unit. Of course, with respect to the parking brake, the disc spring unit needs to be loaded with a higher hydraulic force than the maximum hydraulic force during the service brake in order to preload the disc spring unit for the parking brake.
International Publication No. 2004/041608 Pamphlet

  The object of the present invention is therefore to improve a service and parking brake of the type described at the outset.

  According to the device of the present invention for solving this problem, it is a service and parking brake, provided with an actuating device, and by the actuating device, the friction brake pad is a rotatable braking body to be braked. In a type in which an energy storage is provided, and the energy storage is adapted to load and brake a friction brake pad, and the energy storage is connectable and It can be shut off.

  The common / use parking brake according to the present invention includes an energy accumulator as well as the known common / use parking brake, and the energy accumulator loads and brakes the friction brake pad. According to the invention, the energy store is connectable and disconnectable. With regard to the service brake, the energy storage of the service and parking brake according to the invention is shut off and the service brake is not affected by the energy store. With respect to the parking brake, the energy accumulator is connected and a parking brake force is exerted. The connected energy accumulator prevents the normal / parking brake from being released due to cooling after the vehicle stops, for example.

  In accordance with the advantages of the present invention, the energy accumulator need only be loaded with the energy or preload required for the parking brake by being connectable and disconnectable. No energy storage or preloading beyond the maximum service braking force is required. Nevertheless, since the energy store can be shut off, it does not affect the service brake, and no energy is stored or taken off during the service brake with the energy store shut off. .

  The service and parking brake according to the invention is provided in particular as an electromechanical brake and / or a disc brake. In the meaning of electromechanical, the brake is equipped with an electromechanical actuating device. Configurations other than disc brakes, such as drum brakes, are also conceivable. The service and parking brake according to the present invention may be provided with a self-intensifying device. For example, a mechanical self-intensifying device having a wedge mechanism or a ramp mechanism is known. For example, a hydraulic self-enhancing device is also conceivable.

  The dependent claims describe advantageous embodiments and refinements of the arrangement according to claim 1 of the present invention.

  Next, embodiments of the present invention will be described in detail using the illustrated examples.

  The service and parking brake 1 according to the present invention shown in FIG. 1 is formed as a disc brake that is movable laterally with respect to a brake disc 2 as a braking body and that has a brake caliper (not shown) (so-called floating caliper). ing. The service and parking brake 1 includes a friction brake pad 3, and the friction brake pad 3 is pressed against the brake disc 2 for braking. The reaction force moves a brake caliper (not shown), thereby causing a friction brake pad (not shown) located on the opposite side of the brake disc 2 to the opposite surface of the brake disc 2 to be placed on the opposite side of the brake disc 2. Press. This is well known to experts and will not be described in detail.

  The friction brake pad 3 is attached to a pad support 4, and the pad support 4 is movable laterally with respect to the brake disc 2 by a screw transmission device 5. In the illustrated embodiment of the present invention, the screw transmission device 5 is a spindle transmission device including a nut 6 that cannot be rotated and is movable in the axial direction, and a spindle 7 that can be rotationally driven. Further, an embodiment (not shown) having a nut that can be rotationally driven and a spindle that can be axially moved in this manner is also conceivable. By rotating the spindle 7, the nut 6 and the pad support 4 and the friction brake pad 3 together with the nut 6 are moved laterally with respect to the brake disc 2. In this way, the friction brake pad 3 can be pressed against the brake disc 2, and the brake disc 2 is braked.

  The spindle 7 is supported by a thrust caliper 8 so as to be rotatable by a brake caliper (not shown). The screw transmission device 5 is a part of the operation device of the service and parking brake 1 that will be described subsequently. The screw transmission device 5 directly resists the pressing force of the friction brake pad 3 against the brake disc 2 in this way. It is supported in the brake caliper. Another part of the service and parking brake which will be described subsequently is not loaded by the pressing force of the friction brake pad 3 against the brake disc 2 which is thus exerted for braking.

  The spindle 7 is rotated by an electric motor 9 that drives the ring gear 10 of the ring gear transmission 11. The ring gear 10 is not rotatable relative to the differential 12 (that is, rotates together), and the differential 12 can be driven to rotate together with the ring gear 10. The ring gear 10 and the differential 12 are arranged coaxially with respect to the spindle 7 of the screw transmission device 5. An output portion 13 coaxial with the spindle 7 of the differential 12 passes through the ring gear 10 coaxially and cannot rotate relative to the spindle 7. For the service brake, the ring gear 10 is driven by the electric motor 9 and the differential 12 and the spindle 7 are driven to rotate by the ring gear 10, whereby the friction brake pad 3 is moved laterally with respect to the brake disc 2, Pressed against the disk 2. The electric motor 9, the ring gear transmission 11 provided with the ring gear 10, the differential 12, and the screw transmission 5 are electromechanical actuators 5, 9, 10, 11, of the service and parking brake 1 according to the present invention. 12 is formed.

  The differential 12 includes another drive and output unit 14 coaxially with the output unit 13 and on the opposite side. The additional drive and output 14 can be fixed to the brake. In the illustrated embodiment of the invention, an (electric) magnet brake 15 is selected. The magnet brake 15 may be monostable or bistable. According to the meaning of monostable, the magnet brake 15 operates in a non-energized state or is deactivated, and is held by energization of the electromagnet at another position. In the sense of bistable, the magnet brake 15 is not energized and is maintained not only in the actuated position but also in the actuated release position and simply energized for switching, in this case energizing and actuating for actuation. Energization for release is in the opposite direction. Such a magnetic brake 15 is known and will not be described in further detail here. Structurally, the magnet brake 15 can be formed in the same manner as an electromagnetic clutch.

  Another drive and output unit 14 of the differential 12 is coupled to a second screw transmission device 16, and the second screw transmission device 16 includes a spindle 17 and a nut 18. Since the thread of the second screw transmission device 16 has a relatively large thread pitch and is non-self-locking, the spindle 17 can be rotated by the axial movement of the nut 18. The nut 18 is movable in the axial direction and is held so as not to rotate. The nut 18 is loaded in the axial direction by a disc spring unit 19, and the disc spring unit 19 is generally also called a spring element. Instead of the disc spring unit 19 shown, for example, a compression coil spring or a tension coil spring is also conceivable (not shown). The disc spring unit 19 and the second screw transmission 16 form an energy accumulator 20, which is also called a spring force accumulator due to the use of a spring element or disc spring unit 19. In principle, another energy accumulator is also conceivable, for example a pressure accumulator, which is also understood as a spring accumulator (not shown).

  Energy is stored in the energy storage 20 by preloading the disc spring unit 19 by the electric motor 9. Since the electric motor 9 is energized and drives the differential 12 via the ring gear transmission 11 and the spindle 7 of the first screw transmission 5 via the differential 12 as already described, the friction brake pad 3 Is pressed against the brake disc 2. The nut 6 of the first screw transmission device 5 holds the spindle 7 and holds the output portion 13 of the differential 12 together with the spindle 7 when the friction brake pad 3 comes into contact with the brake disc 2 and stops moving any more. To do. Further, the differential 12 is rotationally driven by the electric motor 9 via the ring gear transmission 11. When the operation of the magnet brake 15 is released, the spindle 17 of the second screw transmission device 16 is rotated via the drive / output unit 14 to move the nut 18, and the nut 18 is preloaded on the disc spring unit 19. Add When energy is accumulated in the energy accumulator 20 by preloading the disc spring unit 19, the magnet brake 15 is actuated, whereby the spindle of the second screw transmission device 16 and the drive / output portion 14 of the differential 12 are relatively rotated. It is held impossible, that is, fixed. The disc brake 1 is deactivated when the electric motor 9 is driven in the reverse rotation direction. The energy is stored in the energy storage 20 when the vehicle is stopped.

  As described above, the service and parking brake 1 according to the present invention is operated as a service brake by an electromagnetic operating device including an electric motor 9, a ring gear transmission 11, a differential 12, and a first screw transmission 5. . The energy storage 20 is interrupted by the actuated magnet brake 15. The magnet brake 15 forms a lock device for fixing the energy storage 20 for the purpose of shutting off the energy storage 20.

  For use as a parking brake, the service and parking brake 1 is actuated in the form described, and the magnet brake 15 is deactivated in the actuated state of the brake. Thereby, the energy storage 20 is connected. The disc spring unit 19 to which the preload is applied loads the nut 18 of the second screw transmission device 16 in the axial direction. The axially movable and non-rotatable nut 18 applies torque to the spindle 17 via the non-self-locking thread of the second screw transmission 16 and the torque is transmitted through the differential to the first screw transmission 5. Is transmitted to the spindle 7. In this way, the energy accumulator 20 presses the friction brake pad 3 against the brake disk 2 and the torque retained by the non-energized electric motor 9 is used in the first screw transmission device 5 in the tightening direction in the service-cum-parking. It affects the operating direction of the brake 1. The energy storage 20 prevents the service / parking brake 1 from being released and released due to a change in length due to heat during cooling after the vehicle has stopped, for example. The energy store 20 holds the parking brake force.

  The differential 12 constitutes a distribution transmission device (transfer). The distribution transmission device uses a drive moment of the electric motor 9 to drive the service and parking brake 1, the first screw transmission device 5, and a disc spring. In order to store energy by preloading the unit 19, it is distributed to the energy storage 20. Through the differential 12 forming the distribution transmission, the energy store 20 can be connected and disconnected to store energy and to maintain or form a service brake force. Instead of the differential 12, for example, a planetary gear device (not shown) can be used as the distribution transmission device. Instead of the differential 12, a switchable distribution transmission can also be used (not shown). Such distribution gears are known to the expert and are therefore not described in detail here. As described, energy can be stored in the energy accumulator 20 by the electric motor 9 of the electromechanical actuator of the service / parking brake 1, the ring gear transmission 11, and the differential 12 constituting the distribution transmission.

  The energy storage 20 is monitored by measuring the power consumption of the electric motor 9 when storing energy in the energy storage 20 or, alternatively, directly or indirect length measurement of the disc spring unit 19. Or by measuring the rotation of the spindle 17. As long as the components of the energy store 20 do not move, the pre-stored energy is still stored.

  The embodiment of the service and parking brake 21 according to the invention shown in FIG. 2 is also formed as a disc brake. The service / parking brake 21 includes a ball ramp mechanism (mechanism including balls and inclined surfaces) 22 for pressing the friction brake pad 23 against the brake disc 24. The ball ramp mechanism 22 includes two circular disks 25 that are coaxial, parallel to each other, and arranged at a slight distance from each other, and ball grooves 26 are attached to opposite end surfaces of these disks 25. Yes. The ball groove 26 extends in the circumferential direction and is inclined in the circumferential direction, that is, the ball groove 26 is flat in one circumferential direction. The ball groove 26 extends over a part of one rotation length in the circumferential direction. A ball 27 is accommodated in the ball groove 26 as a rolling element, and the disks 25 of the ball ramp mechanism 22 are supported in the axial direction via the balls. When both the disks 25 are relatively rotated, the ball 27 rolls in the ball groove 26, thereby pressing both the disks 25 apart in the axial direction. In this way, the friction brake pad 23 is pressed against the brake disc 24 in order to operate the service and parking brake 21.

  The ball lamp mechanism 22 is rotated by an electric motor 28, and a transmission device (not shown) can be flange-coupled to the electric motor 28. The electric motor 28 and the ball ramp mechanism 22 constitute an electromechanical actuating device for the service and parking brake 21.

  An electromagnetic clutch 29 is disposed between the electric motor 28 and the ball ramp mechanism 22, and the electromagnetic clutch 29 is pressed to operate the service / parking brake 21 as a service brake.

  A torsion spring 31 is disposed on a shaft 30 that couples the electric motor 28 and the electromagnetic clutch 29. One end portion of the torsion spring 31 is firmly connected to the shaft 30, and the other end portion of the torsion spring 31 is firmly connected to the clutch output portion 32 of the electromagnetic clutch 29. The clutch output part 32 is coupled to the input part of the ball ramp mechanism 22 firmly or in some cases incapable of relative rotation.

  In order to preload the torsion spring 31, the electromagnetic clutch 29 is released and the service / parking brake 21 is loaded by the electric motor 28 in the direction of releasing the operation. Since the rotation angle of the ball ramp mechanism 22 is limited, the clutch output portion 32 that cannot rotate relative to the ball ramp mechanism 22 does not rotate together, and is attached to the clutch output portion 32 of the torsion spring 31. The other end is held in a relatively non-rotatable manner. A preload is applied to the torsion spring 31 by the rotation of the electric motor 28. When the preload is sufficiently applied to the torsion spring 31, the electromagnetic clutch 29 is pushed in, so that the shaft 30 is coupled to the clutch output portion 32 so as not to be relatively rotatable. Thus, the preload of the torsion spring 31 is maintained. The torsion spring 31 constitutes an energy storage for the service and parking brake 21. The electromagnetic clutch 29 constitutes a lock device for fixing the energy storage.

  In order to operate as a parking rake, the service and parking brake 21 is operated by an electric motor 28 as described. In the actuated state, the electromagnetic clutch 29 is de-actuated, and as a result, the spring moment of the torsion spring 31 loads the clutch output part 32 and moves the ball ramp mechanism 22 together with the clutch output part 32 in the direction of operation of the service and parking brake 21. To load. The torsion spring 31 retains the parking brake force of the service / use parking brake 21 and prevents the service / use parking brake 21 from being deactivated by reducing the load during cooling after the vehicle stops, for example, as a result of a change in length due to heat. . By means of the electromagnetic clutch 29, the torsion spring 31 that constitutes the energy storage of the service and parking brake 21 can be connected and disconnected. When the electromagnetic clutch 29 is activated and therefore the energy store formed by the torsion spring 31 is shut off, the torsion spring 31 does not act on the service brake. The energy is also stored in the service / parking brake 21 of FIG. 2 by the preloading of the torsion spring 31 or the disc spring unit 19 by the electric motor 28 as in the service / parking brake 1 of FIG. In addition to measuring the power consumption of the electric motor 28, the energy accumulation can be monitored by measuring the rotation when the torsion spring 31 is preloaded (not shown).

It is a circuit diagram which shows one Example of the regular and parking brake of this invention. It is a circuit diagram which shows one Example of the regular and parking brake of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Service and parking brake, 2 Brake disc, 3 Friction brake pad, 4 Pad support body, 5 Screw transmission device, 6 Nut, 7 Spindle, 8 Thrust bearing, 9 Electric motor, 10 Ring gear, 11 Ring gear transmission device, 12 Differential, DESCRIPTION OF SYMBOLS 13 Output part, 14 Drive and output part, 15 Magnet brake, 16 Screw transmission device, 17 Spindle, 18 Nut, 19 Belleville spring unit, 20 Energy storage, 21 Common use parking brake, 22 Ball lamp mechanism, 23 Friction brake pad 24 brake disc, 25 disc, 26 ball groove, 27 ball, 28 electric motor, 29 electromagnetic clutch, 30 shaft, 31 torsion spring, 32 clutch output section

Claims (11)

It is a regular and parking brake,
Actuators (5, 9, 11, 12; 22, 28) are provided, by means of which the friction brake pads (3; 23) are braked by means of the actuators (5, 9, 11, 12; 22, 28). It is designed to be pressed against the pivotable brake body (2; 24) to be
In the form of an energy storage (20; 31) provided, the energy storage (20; 31) loading the friction brake pads (3; 23) to exert a braking force ,
Service and parking brake, characterized in that the energy store (20; 31) can be connected and disconnected.   2. The utility according to claim 1, wherein energy is stored in the energy accumulator (20; 31) by means of an actuator (9, 11, 12; 22, 28) of the service and parking brake (1). The parking brake.   The service and parking brake (1) includes a distribution transmission device (12) for connecting and disconnecting the energy accumulator (20), and the distribution transmission device (12) is an actuating device (9, 11). ) And an output (13) for the friction brake pad (3), the distribution transmission (12) being a separate drive and output for the energy accumulator (20) (14), so that the energy is accumulated in the energy accumulator (20) through the distribution transmission device (12) by the operating device (9, 111) of the service and parking brake (1). 2. The common use as claimed in claim 1, wherein the energy accumulator (20) applies a braking force by loading the friction brake pad (3) via the distribution transmission (12). Parking break .   4. The service and parking brake according to claim 3, wherein the distribution transmission (12) comprises a differential.   The combined service and parking brake according to claim 1, wherein the combined use and parking brake (1) comprises a locking device (15; 29) for fixing the energy storage (20; 31).   6. The combined service and use of claim 5, wherein the combined use and parking brake (1; 21) comprises a brake (15) or a clutch (29) as a locking device for fixing the energy storage (20; 31). Parking brake.   2. The service and parking brake according to claim 1, wherein the energy store (20; 31) is a spring force store.   The energy accumulator (20) includes a screw transmission (16) having a non-self-locking thread, the energy accumulator (20) is loaded with an axial force and turns the axial force into torque. The service and parking brake according to claim 1, which is adapted to be converted.   The actuating device (5) comprises a support (8) against the reaction force of the force pressing the friction brake pad (3) against the braking body (2) when the brake (1) is in operation. Regular and parking brake.   2. The service and parking brake according to claim 1, wherein the service and parking brake (1; 21) comprises a monitoring device for the energy storage (20; 31).   2. The service and parking brake according to claim 1, wherein said service and parking brake (1) comprises an electromechanical actuating device (5, 9, 11, 12; 22, 28).

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