Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
  • B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
  • B60T13/74—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with electrical assistance or drive
  • B60T13/745—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with electrical assistance or drive acting on a hydraulic system, e.g. a master cylinder

Definitions

• the invention relates to a brake booster with an electric motor for a master cylinder, which is coupled by means of a transmission means with a pressure piston of the master cylinder, and amplifies a transmitted by means of a brake pedal to the pressure piston brake pressure.
• power-assisted brake systems have a friction medium z.
• a brake disc or a brake drum and a Radaktuator such as a caliper with a wheel brake on.
• the Radaktuator is connected to a master cylinder by means of associated brake lines.
• the master cylinder is further coupled to a brake pedal.
• the brake booster is disposed between the brake pedal and the master cylinder and uses external energy, for example in the form of compressed air, negative pressure or electrical energy, to amplify a pedal applied by the driver pedal force on the brake pedal.
• Usual gain factors are in a car in the range of five to ten.
• a vacuum pump is required in addition to a vacuum-operated pneumatic brake booster.
• the space required for a pneumatic brake booster depends on the necessary brake booster.
• the diameter of the pneumatic brake booster can be up to 30 cm.
• DE 10 2007 016 136 A1 an electromechanical brake booster for a vehicle brake system is shown, which has an electric motor for brake booster and a master cylinder coupled thereto.
• the electric motor is connected to a spindle screw.
• the spindle screw is coupled via a punch and a driver to the master cylinder.
• the latter drives the spindle screw and displaces the punch against the master brake cylinder in order to increase the brake pressure introduced via the brake pedal.
• the brake booster is particularly compact formable by a transmission means which couples an electric motor with a master cylinder, a cam gear, which is operatively connected to a pressure piston of a master cylinder and that the cam gear causes a displacement of the pressure piston in the master cylinder.
• the cam gear has at least one cam, whose peripheral side is associated with a rolling device.
• the unwinding device is coupled to the pressure piston and designed to unroll along the peripheral side of the cam. This has the advantage that a desired course of the brake booster can be flexibly adapted via the design of the peripheral side of the cam.
• the pressure piston is connected directly to the unwinding device via an extension of the pressure piston. In this way, the brake booster can be made particularly robust.
• a first cam disk is connected to a first spur gear and a second cam disk is connected to a second spur gear, wherein the two spur gears are coupled to at least one third spur gear and the cam disks fastened to the spur gears actuate the unwinding device.
• the pressure piston of the master cylinder can be directly operated without a deflection, so that the master cylinder are aligned together with the brake booster in a particularly compact design to each other.
• the pressure piston is connected to the unwinding device by means of a rocker arm, wherein the rocker arm has a receptacle for a tilting axis.
• a circumferential contour of the cam is formed spirally or elliptically. These circumferential contours are particularly suitable for a uniform increase in the brake pressure.
• the cam on a locking device which has a locking element and a spring element, wherein the locking device pulls the brake pedal in an initial position by the locking element entrains the unwinding on the cam.
• the brake booster has a rear part device, in particular a spiral spring, which is coupled to the cam disc and a housing.
• the rear part device braces against the housing and rotates by means of the tension the cam in a starting position.
• the cam gear is coupled to the electric motor by means of a further gear, in particular a planetary gear or a spur gear.
• a further gear in particular a planetary gear or a spur gear.
• the brake booster is connected to a control unit which controls the energization of the electric motor of the brake booster based on the brake pressure applied via the brake pedal. In this way, the desired brake pressure and the desired braking characteristics of the vehicle can be variably adjusted accordingly.
• FIG. 1 shows a schematic 3D representation of a brake booster according to a first embodiment
• FIG. 2 shows a schematic 3D illustration of a brake booster according to a second embodiment
• Fig. 3 is a schematic side view of a brake booster according to a third embodiment.
• FIG. 4 shows a schematic 3D representation of a brake booster according to a fourth embodiment.
• the brake booster 100 has an electric motor 16 and an unillustrated planetary gear. Of the Electric motor 16 is fastened in a vehicle by means of fastening elements 24 and is connected by means of a terminal 17 to the electrical system and a control unit 50.
• the cam 15 is arranged on an output shaft 32 of the transmission.
• the cam 15 has a peripheral side 18, whose peripheral contour is adapted according to a torque curve of the electric motor 16 and formed spirally.
• the peripheral side 18 of the cam 15 is associated with a unwinding device 19.
• the unwinding device 19 is fastened by means of a bearing pin 20 at a first end of a rocker arm 14.
• the rocker arm 14 comprises in the central position a receptacle 21 which is associated with a tilting axis 22.
• a pressure piston 1 1 of a master cylinder 10 At the Abroll worn 19 opposite the second end of the rocker arm 14 of the rocker arm 14 is connected to a pressure piston 1 1 of a master cylinder 10.
• the master cylinder 10 further includes a piston rod 12 and a plurality of line connections 23.
• the piston rod 12 is connected via a connecting head 13 to the brake pedal. Further, the piston rod 12 and the pressure piston
• the electric motor 16 is energized by a control unit 50.
• Electric motor 16 drives as a transmission means a cam gear with the cam 15, on the peripheral side 18 during a rotation of the cam 15, the unwinding device 19 along the peripheral side 18 rolls.
• the unrolling device 19 is arranged on the bearing pin 20 by means of a roller bearing.
• the unwinding device 19 scans the circumferential contours of the cam 15. If the cam 15 is rotated by the electric motor 16 counterclockwise, the rocker arm 14 is pressed to the outside. The second end of the rocker arm 14 presses the plunger 1 1 in the master cylinder 10. The second end of the rocker arm 14 is not connected to the plunger 1 1, but is located on the axial end surface of the plunger 1 1, to no forces transverse to the direction of the pressure piston 1 1 in the pressure piston 1 1 introduce. Forces transverse to the direction of displacement of the pressure piston 1 1 would due to the narrow tolerance range in the production of the pressure piston and the housing of the master cylinder 10 to tilt the pressure piston
• the piston rod 12 is designed so that the force introduced via the piston rod end 13 is transmitted from the brake pedal to the pressure piston 1 1. In this way, it is ensured that the brakes are actuated by means of the brake circuit connected to the master cylinder without the electric support.
• FIG. 2 shows a schematic 3D representation of a brake booster 200 according to a second embodiment.
• the brake booster 200 in this case has an electric motor 16 shown in FIG.
• the electric motor 16 is connected to a transmission 47 as a transmission means, wherein two opposite cams 15, 49 are each connected to a spur gear 25, 48.
• the first spur gear 25 with the first cam 15 of the cam gear is arranged so that the second spur gear 48 is opposite to the second cam 49, wherein the cams 15, 49 to each other at a distance.
• Both spur gears 25, 48 is at least a third spur gear 26 which is arranged on the drive axle 27 assigned. In each case one circumferential side 18 of the cam disks 15, 49 is scanned by a unwinding device 19.
• the unwinding device 19 is connected directly to the pressure piston 1 1.
• a coil spring 44 is arranged, which is connected on the inside with the spur gear 48 and at the outer end with the housing, not shown.
• the electric motor 16 drives the drive axle 27 with the third spur gears 27.
• a rotation of the two spur gears 15, 49 results in a rotation of the cam disks 15.
• the rotation of the two cam disks 15 is coupled to the necessary displacement of the pressure piston 11.
• the cam disk transmission is coupled with a spur gear as transfer means.
• the force distribution can be adjusted here via the gear stages of the spur gear and the cam gear.
• the brake booster 200 is designed to introduce no forces transverse to the direction of displacement of the pressure piston 1 1 in the pressure piston 1 1.
• the drive shaft 27 is arranged orthogonal to the unwinding direction 19 and to the direction of displacement of the pressure piston 1 1 of the brake booster.
• the helical spring 44 serves as a rear-part device in order, after a rotation hen the cams 15, 49 to put them back into the starting position.
• the coil spring 44 is biased between a housing, not shown, and the first spur gear 25 installed. By rotating the first spur gear 25, the coil spring 44 is further braced. If the brake system is relaxed by the driver, either the control device 50 shown in FIG.
• FIG. 3 shows a schematic side view of a brake booster 300 according to a third embodiment.
• the brake booster 300 has a cam 29 of the cam gear with an elliptical peripheral side 30.
• the peripheral side 30 is associated with the unwinding device 19, wherein the unwinding device 19 is directly connected via an extension 28 with the sleeve 1 1.
• the cam 29 is rotated by the symbolically represented drive 31 with a worm gear, wherein due to the symmetrical configuration of the cam 29, a maximum rotational range of 180 ° to
• the electric motor 16 can also be connected directly to the cam disk or by means of a single-stage or multistage transmission, such as a helical, spur or planetary or sliding wedge gear.
• a single-stage or multistage transmission such as a helical, spur or planetary or sliding wedge gear.
• the cam disk 29 can also be coupled to the drive 31 as a double cam disk set with two cam disks 15, 29, as shown in FIG. 2.
• 4 shows a schematic 3D illustration of a brake booster 400 according to a fourth embodiment.
• the brake booster 400 is coupled by means of a triangle 39 with the brake pedal 33 and the master cylinder 34.
• the structure of the drive of the cam 15 of the camshaft transmission corresponds to the structure shown in FIG.
• the triangle 39 is connected to the first suspension point 37 with the brake pedal 33 and the vehicle.
• the triangle 39 is connected to the pressure piston 43 of the master cylinder 34.
• the unwinding device 19 is arranged.
• the unwinding device 19 is associated with a locking device 46 on the cam 15.
• the locking device 46 includes a
• Locking element 38 and a spring element 41st The locking device 46 is rotatably mounted in a pivot point 42. Furthermore, a driving latch 40 is arranged on the triangle 39. The gain of the brake pressure takes place when the cam 15 is rotated counterclockwise. In this case, the cam plate 15 presses the unwinding device 19 clockwise about the first suspension point 37. Further, the pressure piston 43 is displaced in the master cylinder 34 and thereby amplifies the pressure in the brake system.
• the arrangement shown is needed in electric vehicles or vehicles with hybrid drive to carry the brake pedal 33 after actuation of the master cylinder 34 back to a starting position. If the brake pedal 33 is actuated by the vehicle driver, the brake pedal pushes the piston rod 12 into the master brake cylinder 34. Furthermore, the displacement of the brake pedal 33 is recorded by means of a sensor, not shown.
• the control unit 50 controls the electric motor 16 so that the cam plate 15 is tracked in accordance with the displacement of the brake pedal 33, so that via the pressure piston 43, the brake pressure is increased. In order to achieve the maximum displacement of the pressure piston 1 1, the cam 15 is rotated by about 300 ° degrees. However, other angles are conceivable.
• the latch 40 is configured to engage the brake pedal 33.
• the unwinding device 19 and the locking device 46 serve to pull the brake pedal 33 to the starting position.
• the cam 15 can be further rotated by the electric motor 16 from a set position counterclockwise, so that the Abrollinides 19 rolls over the outwardly directed peripheral side 18 near the starting position.
• the outer contour of the blocking element 38 is designed so that the unwinding device 19 can roll on the peripheral side 18 of the cam 15 and is returned.
• the electric motor 21 rotates the cam 15 in a clockwise direction, wherein the unwinding device 19 is moved between the locking element 38 and the peripheral side 18 in the starting position.
• the locking device 46 grips the unwinding device 19 so that the triangle is pulled 39 to the right.
• the driving pawl 40 also pulls the brake pedal 33 back to the starting position.
• the peripheral side 18 is configured such that in the region of the locking device 46, the unwinding device 19 is thereby fixed by the peripheral side 18 on the cam by the surface of the unwinding device 19 and the peripheral side 18 of the cam 15 block each other and unrolling the unwinding device 19th prevent to allow retraction of the brake pedal 33.

Landscapes

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

Priority Applications (3)

Applications Claiming Priority (2)

Publications (1)

Family

ID=43603155

Family Applications (1)

Country Status (5)

Cited By (1)

Families Citing this family (6)

Citations (3)

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• 2009
  • 2009-09-18 DE DE200910029594 patent/DE102009029594A1/de not_active Withdrawn
• 2010
  • 2010-07-22 EP EP10737541A patent/EP2477860A1/de not_active Withdrawn
  • 2010-07-22 JP JP2012529172A patent/JP5456164B2/ja not_active Expired - Fee Related
  • 2010-07-22 WO PCT/EP2010/060600 patent/WO2011032758A1/de active Application Filing
  • 2010-07-22 CN CN201080041614.4A patent/CN102596667B/zh not_active Expired - Fee Related

Patent Citations (3)

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