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
  • B60T7/00—Brake-action initiating means
  • B60T7/02—Brake-action initiating means for personal initiation
  • B60T7/08—Brake-action initiating means for personal initiation hand actuated
  • B60T7/10—Disposition of hand control
  • B60T7/107—Disposition of hand control with electrical power assistance
• • 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
  • B60T13/746—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 and mechanical transmission of the braking action

Definitions

• Motorized parking brake including possibility of manual actuation
• the present invention relates to a motorized parking brake for a motor vehicle.
• Motorized parking brake regulations require the driver of the vehicle to be able to manually apply the brake in all circumstances, in order to be able to remedy an emergency situation or a failure preventing the motorized brake mechanism from operating.
• the object of the invention is to provide a motorized parking brake requiring no particular switching maneuver prior to a manual braking action and making it possible to eliminate the manual braking lever, the assembly being of a simple construction and meeting the regulations. in force in this area.
• the invention therefore relates to a motorized parking brake for a motor vehicle comprising a braking unit associated with the wheels of the vehicle and an actuation unit comprising motorized actuation means and manual means for actuating the brake, these units being connected to each other via a movement transmission link, characterized in that said motorized actuation means and said manual actuation means are mechanically coupled in parallel to said transmission link so that they can act on the latter independently of each other.
• said transmission link is integral with a toothed wheel meshing with first and second racks movable in longitudinal translation, said racks respectively forming the motor outputs of said motorized actuation means and said means of '' manual actuation;
• said motorized actuating means comprise a drive motor, preferably electric, coupled to said first rack so as to be able to cause its longitudinal translation, as well as an adjustment loop making it possible to control the drive motor in both directions;
• said manual actuation means comprise a manual traction cable wound on a rotary drum coupled to said second rack by means of a disengageable coupling mechanism, to allow the longitudinal translation of this second rack by unwinding of said traction cable manual said drum;
• the parking brake being of the type comprising jaws associated with the vehicle wheels and means for returning these jaws to the released position of the brake, said drum is mounted on a rotary shaft to which is coupled a quick release release latching assembly whose locking action is opposed to the action of said jaw return means;
• said disengageable coupling means comprise a
• FIG. 1 is a partial schematic view of the means of motorized actuation of a parking brake according to the invention, the brake being released;
• Figure 2 is a partial view similar to that of Figure 1, the parking brake being applied by a motorized action;
• Figure 3 is a partial view similar to that of Figures 1 and 2, the brake being applied by manual action;
• Figure 4 is a schematic view, partially in section of the manual actuation means of a parking brake according to the invention, showing the transmission ensuring manual actuation before a manual braking action;
• Figure 5 is a view similar to that of Figure 4, showing the manual actuation means while their constituent parts are in their intermediate position during a manual braking action;
• Figure 6 is a view similar to those of Figures 4 and 5, showing yet another phase of operation of the manual actuation means during manual tightening;
• FIGS. 7A to 7E are schematic detailed views of a cam and ratchet snap
• the parking brake essentially comprises two functional units which are on the one hand an actuation unit Ul divided itself roughly into a section motorized actuator SI ( Figures 1 to 3) and a manual actuation section S2 ( Figures 4 to 6), and on the other hand a proper braking unit U2 formed by the wheel brakes symbolized in the rectangle U2 in FIG. 1.
• the units Ul and U2 are functionally connected to each other by a transmission link which, in the present example, is formed by a traction cable 1.
• the wheel brakes forming the unit U2 can be of any known type actuated by a movement transmission link such as a cable. They are therefore not described in detail here.
• the unit Ul is housed in a casing 2 comprising a first chamber 2a essentially housing the section SI and having roughly the shape of a flat box.
• the section S2 of the unit U2 is housed in a second chamber 2b of the casing 2 roughly in the form of an elongated rectangular parallelepiped whose longitudinal dimension is perpendicular to the large faces of the chamber 2a of the casing 2.
• the cable 1 passes through an opening 3 made in one of the side walls of the chamber 2a.
• the motorized actuation section SI comprises an electric motor 4 mounted outside against the wall of the chamber 2a.
• This motor 4 is connected to a circuit 5 for adjusting the position of the parking brake (shown for simplicity only in FIG. 1) which comprises a control button 6 on which the driver of the vehicle can act.
• the adjustment circuit 5 can function as a loop for adjusting the clamping force of the parking brake. This adjustment loop can use the signal from button 6 as a set signal for a clamping force, and as an actual signal for a clamping force, a signal supplied by a sensor 7 associated with the shoes of the parking brake.
• the adjustment loop 5 can apply the on-board electrical voltage coming from a terminal 8, to the drive motor 4 to rotate it in the direction of application of the brake (traction on cable 1) and in the opposite direction (release of this cable 1).
• the button 6 can be provided in the passenger compartment of the vehicle at a favorable point from an ergonomic point of view, for example on the dashboard.
• the motor 4 can also be other than electric with the necessary adaptations, for example at the level of the adjustment loop 5, which are within the reach of the specialist.
• the motor 4 is coupled to an endless screw 9 at the free end of which is coupled a first rack 10 with single teeth 10a mounted to slide longitudinally in the chamber 2a of the casing 2, by guide means which have not been as outlined in the figures.
• the rack 10 meshes with a pinion 11 which is caught in a yoke 12 to which the cable 1 is attached.
• the pinion 11 also meshes with a second rack 13 with double toothing 13a and 13b also slidably mounted in the casing 2 by guide means, shown, similarly, in a simplified manner.
• This second rack 13 meshes with a transmission pinion 14 which constitutes the output of the manual actuation section S2 as described below.
• the manual actuation section S2 is shown more particularly in FIGS. 4 to 7E. It comprises a drum 15 rotatably mounted around an axis XX on a shaft 16 in the chamber 2b of the casing 2. On this drum 15 is wound a traction cable 17 attached by one end to this drum and carrying at its opposite end a gripping ring 18 or the like by which manual traction can be exerted on the cable 17, at a place outside the casing 2, this place being able to be chosen remote from the latter for example on the dashboard of the vehicle, the cable being able to be guided in a sheath (not shown) provided for this purpose.
• the casing 2 can thus be installed at any location in the vehicle, in particular outside the area between the front seats and more generally outside the passenger compartment of the vehicle. In this way, the space provided between the front seats is free of any space, in particular by a parking brake lever so that it can be used for example to install comfort elements, such as a storage chest, a cooler , or the like.
• the shaft 16 carries a pinion 19 meshing with a toothed wheel 20 wedged at the end of a second shaft 21 of axis Y-Y rotatably mounted in the chamber 2b, the axis Y-Y being parallel to the axis X-X.
• a worm screw 22 is cut on a part of the shaft 21.
• a nut plate 23 is screwed on this worm screw and immobilized in rotation by a finger 24 which is integral therewith and which slides in a rectilinear guide 25 provided parallel to the axes XX and Y- Y in the casing 2.
• the plate 23 carries hooks 26.
• a cylindrical sleeve 27 is mounted in longitudinal translation and in rotation in the chamber 2b along the axis YY which coincides with its own axis, by means of guide means which have not been shown. At one of its ends, this sleeve has a flange 28 which comes to hang behind the hooks 26 of the nut plate 23.
• the bore of this sleeve has rectilinear grooves at 27a and 27b, interrupted in an area 27c where the bore of the sleeve is smooth.
• Two toothed wheels 29 and 30 are fixed respectively on the shaft 22 and on a shaft 31 on which is also fixedly fixed the transmission pinion 14. These toothed wheels cooperate respectively with the internal grooves 27a and 27b of the sleeve 27.
• the actuation section S2 also includes a latching assembly 32 with release by quick release which is sometimes called "brake reel” used for example for blinds or projection screens.
• a cam 33 comprising two notches 34a and 34b of rectangular shape at its periphery. With this cam cooperates a pawl 35 urged against the cam by a spring 36 (shown only in FIG. 7A) and articulated in the wall of the chamber 2b of the casing 2.
• the active tip of this cam has a blocking surface 35a which, when the tip is engaged in one of the notches 34a or 34b, is applied against one of the side walls of the latter. This blocking surface 35a is connected to two oblique exhaust surfaces 35b and 35c.
• the parking brake has in its unit U2 an elastic return device (symbolized by the spring r in the rectangle U2 in FIG. 1) urging the brake shoes M associated with the wheels R to loosen, which causes traction on the cable 1.
• This traction is transmitted by means of the mechanism of section S2 on the drum 15 in a direction tending to wind the cable 17 for manual actuation on this drum.
• the operation of this parking brake is as follows.
• FIG. 1 A - Motorized action This operating mode is shown in Figures 1 and 2.
• the brake is fully released and the traction cable 1 is tensioned by the elastic return device R of the brake shoes M.
• the motor 4 is supplied via the adjustment loop 5 as a function of the braking demand expressed by the degree of rotation of the button 6 and this up to the signal representing this request equalizes the signal supplied by the sensor 7.
• the screw 9 is screwed into the rack 10, which drives the toothed wheel 4 (to the left in Figures 1 and 2), this wheel being able to roll on the corresponding toothing 13a of the rack 13.
• a traction is then exerted on the cable 1 in the direction of application of the parking brake against the action of the elastic return device R of the jaws M.
• the position maximum tightening is shown in Figure 2.
• a brake release occurs when, at the request of the driver, the adjustment loop 5 turns the motor 4 in the opposite direction to release the cable 1.
• the sleeve 27 has moved over a distance such that the toothed wheel 29 enters the area 27c of the sleeve devoid of grooves ( Figure 5).
• the sleeve 27 therefore stops rotating while it continues to move in the axial direction along the YY axis.
• the wheel 14 was rotated by means of the shaft 31, driving with it the rack 6 and consequently the wheel 11.
• the cable 1 was therefore momentarily pulled in the direction of parking brake application.
• the movement was not sufficient to cause effective tightening.
• the pawl 35 has not prevented the operations from taking place since it has escaped the notches 34a and 34b thanks to the exhaust face 35c.
• the driver To then release the brake, the driver must pull only slightly on the cable 17, so that the tip of the hook 35 can be located approximately halfway between the notches 34a and 34b. If under these conditions, it quickly releases the cable 17, the tip of the hook will quickly cross the notches 34a and 34b thanks to the exhaust surface 35b, as illustrated in FIGS. 7C, 7D and 7E. Thus, the shaft 16 can rotate freely and the brake is released partially or completely according to the driver's wishes. For partial loosening, the slackening of the cable 17 must be greatly slowed down so that the tip of the hook 35 can again be blocked in a notch 34a or 34b by its blocking surface 35a. The force used to release the brake comes from its elastic return device R.
• the cable 17 is entirely wound on the drum 15. If, in the case of the invention, the cable 17 is then pulled, the toothed wheel 20 will be rotated while the sleeve 27 translates on the axis YY while simultaneously turning around this axis. The cable 1 will then undergo a slight additional traction, but as soon as the toothed wheel 29 coincides with the space 27c devoid of grooves, the elastic return device R of the brake will be free to act in the direction of release by driving the cable 1, the wheel 11 rolling on the rack 10, the rack 13, the wheel 14 and the sleeve 27 (the latter in rotation only). The vehicle can therefore be moved later.
• the brake can also be applied manually without the motorized unit being able to hamper this manual application of action, according to the procedure which has been described above.

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• Engineering & Computer Science (AREA)
• Transportation (AREA)
• Mechanical Engineering (AREA)
• Braking Arrangements (AREA)

Applications Claiming Priority (3)

Publications (1)

Family

ID=9530654

Family Applications (1)

Country Status (3)

Families Citing this family (3)

Family Cites Families (6)

• 1998
  • 1998-09-21 FR FR9811753A patent/FR2783481B1/fr not_active Expired - Fee Related
• 1999
  • 1999-09-21 EP EP99943018A patent/EP1115597A1/de not_active Withdrawn
  • 1999-09-21 WO PCT/FR1999/002242 patent/WO2000017023A1/fr not_active Application Discontinuation

Non-Patent Citations (1)

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