WO2019133600A1 - Ensemble actionneur électrique pour ensemble frein à tambour - Google Patents

Ensemble actionneur électrique pour ensemble frein à tambour Download PDF

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Publication number
WO2019133600A1
WO2019133600A1 PCT/US2018/067494 US2018067494W WO2019133600A1 WO 2019133600 A1 WO2019133600 A1 WO 2019133600A1 US 2018067494 W US2018067494 W US 2018067494W WO 2019133600 A1 WO2019133600 A1 WO 2019133600A1
Authority
WO
WIPO (PCT)
Prior art keywords
assembly
drum
electric actuator
brake
gear
Prior art date
Application number
PCT/US2018/067494
Other languages
English (en)
Inventor
Manuel Barbosa
Original Assignee
Kelsey-Hayes Company
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kelsey-Hayes Company filed Critical Kelsey-Hayes Company
Publication of WO2019133600A1 publication Critical patent/WO2019133600A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D65/00—Parts or details
    • F16D65/14—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position
    • F16D65/16—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged in or on the brake
    • F16D65/22—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged in or on the brake adapted for pressing members apart, e.g. for drum brakes
    • 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
    • F16D65/02—Braking members; Mounting thereof
    • F16D65/12—Discs; Drums for disc brakes
    • 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
    • F16D51/00—Brakes with outwardly-movable braking members co-operating with the inner surface of a drum or the like
    • F16D2051/001—Parts or details of drum brakes
    • F16D2051/003—Brake supports
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2125/00—Components of actuators
    • F16D2125/18—Mechanical mechanisms
    • F16D2125/20—Mechanical mechanisms converting rotation to linear movement or vice versa
    • F16D2125/34—Mechanical mechanisms converting rotation to linear movement or vice versa acting in the direction of the axis of rotation
    • F16D2125/40—Screw-and-nut
    • 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
    • F16D2125/44—Mechanical mechanisms transmitting rotation
    • F16D2125/46—Rotating members in mutual engagement
    • F16D2125/48—Rotating members in mutual engagement with parallel stationary axes, e.g. spur gears
    • 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
    • F16D2125/44—Mechanical mechanisms transmitting rotation
    • F16D2125/46—Rotating members in mutual engagement
    • F16D2125/52—Rotating members in mutual engagement with non-parallel stationary axes, e.g. worm or bevel gears

Definitions

  • This invention relates in general to drum brake assemblies for automotive vehicles and in particular to an electric actuator assembly for such a drum brake assembly.
  • a common brake system for an automobile or light truck includes a disc brake assembly for each of the front wheels and a drum brake assembly for each of the rear wheels.
  • the brake assemblies are actuated by hydraulic or pneumatic pressure generated when an operator of the vehicle depresses a brake pedal.
  • the brake assemblies may be used to provide service braking, emergency braking, and/or a parking brake function.
  • the structures and operation of these disc brake assemblies and drum brake assemblies are well known in the art
  • the typical drum brake assembly includes a brake drum that rotates with the vehicle wheel and a pair of brake shoe and lining assemblies mat are rotationally fixed.
  • the drum brake assembly operates by the brake shoe and lining assemblies being selectively actuated between braking and non-braking positions. In the braking position, the brake shoe and lining assemblies contact and press against the brake drum to slow or otherwise stop rotation of the wheel to provide braking for the vehicle. In the non-braking position, the brake shoe and lining assemblies do not contact the brake drum and allow the wheel to rotate freely.
  • an electric actuator assembly may be used to actuate the brake shoe and lining assemblies from the non-braking position to the braking position and/or to support or otherwise maintain the brake shoe and lining assemblies in the braking position.
  • the electric actuator assembly actuates the brake shoe and lining assemblies using an electric motor.
  • the electric motor drives a linear translation assembly to selectively displace a gear nut and a spindle either away from or towards each other.
  • the brake shoe and lining assemblies are pressed against the brake drum - i.e., the brake shoe and lining assemblies are actuated to the braking position.
  • the brake shoe and lining assemblies are released from the brake drum - i.e., the brake shoe and lining assemblies are placed in the non-braking position. Electrical currents drawn by the electric motor are measured for control of the actuator assembly.
  • This invention relates to an electric actuator assembly for use with a drum brake assembly.
  • an electric actuator assembly for a drum brake assembly may comprise, individually and/or in combination, one or more of the following features: an electric motor with an output shaft, a gear reduction driven by the output shaft, a linear translation assembly having a gear nut and a rotationally fixed spindle, a spring member between the gear nut and the spindle, a connection portion of the linear translation assembly that is configured to selectively actuate and release a brake shoe and lining assembly of the drum brake assembly, and an electrical sensor measuring an electrical current drawn by the electric motor.
  • the gear nut is driven by the gear reduction.
  • the linear translation assembly linearly translates when the gear nut is driven.
  • the electric motor is turned off as a function of the electrical current.
  • the electric motor is turned off when the electrical current exceeds a threshold value.
  • the threshold value is less than a second value and the electrical sensor measures the second value when the gear nut contacts a stop surface of the linear translation assembly.
  • the spring member compresses as the brake shoe and lining assembly is released and the spring member compressing slows a rate at which the electrical current increases.
  • the spring member is outside the gear nut
  • the spring member is between an end face of the gear nut and a head portion of the spindle.
  • the spring member is inside the gear nut
  • the spring member is between a base portion of the gear nut and a tip portion of the spindle.
  • the spring member is fabricated from a metal, plastic, or elastomer material.
  • the electric actuator assembly may further comprise a first axis about which the output shaft rotates and a second axis along which the linear translation assembly translates.
  • the first axis and the second axis are perpendicular.
  • a drum brake assembly may comprise, individually and/or in combination, one or more of the following features: a brake drum, a brake shoe and lining assembly that is operably displaceable to contact the brake drum, an electric actuator assembly, a drum-in- hat adapter to which the electric actuator assembly is mounted, and a notch in the drum-in-hat adapter in which the electric actuator assembly is inserted in a radial direction.
  • the electric actuator assembly has an electric motor with an output shaft, a gear reduction driven by the output shaft, a linear translation assembly having a gear nut driven by the gear reduction and a rotationally fixed spindle, and a connection portion of the linear translation assembly. The linear translation assembly linearly translates when the gear nut is driven.
  • connection portion is configured to selectively actuate and release the brake shoe and lining assembly.
  • the drum-in-hat adapter has first and second faces, a side surface defined between the first and second faces, and the notch extends radially inward from title side surface.
  • the notch has a depth from the side surface.
  • the drum brake assembly may further comprise a spring member between the gear nut and the spindle and an electrical sensor measuring an electrical current drawn by the electric motor.
  • the electric motor is turned off as a function of the electrical current.
  • the electric motor is turned off when the electrical current exceeds a threshold value.
  • the drum brake assembly may comprise a first axis about which the output shaft rotates and a second axis along which the linear translation assembly translates.
  • the first axis and the second axis are perpendicular.
  • a drum brake assembly may comprise, individually and/or in combination, one or more of the following features: a brake drum, a brake shoe and lining assembly operably displaceable to contact the brake drum, an electric actuator assembly, a drum-in-hat adapter to which the electric actuator assembly is mounted, and a notch in the drum-in-hat adapter.
  • the notch is configured for the electric actuator assembly to be inserted in the notch in a radial direction.
  • the electric actuator assembly has an electric motor with an output shaft, a first axis about which the output shaft rotates, a gear reduction driven by the output shaft, a linear translation assembly having a gear nut and a rotationally fixed spindle, a spring member between the gear nut and the spindle, a second axis along which the linear translation assembly translates, and a connection portion of the linear translation assembly.
  • the gear nut is driven by the gear reduction.
  • the linear translation assembly linearly translates when the gear nut is driven.
  • the connection portion is configured to selectively actuate and release the brake shoe and lining assembly.
  • the first axis and the second axis are perpendicular.
  • the spring member compresses as the brake shoe and lining assembly is released.
  • the drum brake assembly may further comprise an electrical sensor measuring an electrical current drawn by the electric motor.
  • a position of the gear nut on the spindle is a function of the electrical current
  • the electric motor is turned off when the electrical current exceeds a threshold value.
  • the threshold value is less than a second value.
  • the electrical sensor measures the second value when the gear nut contacts a stop surface of the linear translation assembly.
  • the drum brake assembly may further comprise an external drive connection port for the electric motor, a housing of the electric actuator assembly having first and second housing parts, and a housing split line between the first and second housing parts.
  • the external drive for the electric motor, a housing of the electric actuator assembly having first and second housing parts, and a housing split line between the first and second housing parts.
  • connection port is fully within the first housing part.
  • the housing split line is offset from the external drive connection port
  • the linear translation assembly has a normal screw thread.
  • An advantage of an embodiment is an electric actuator assembly with a reduced potential of damage when a spindle of the actuator assembly is retracted.
  • FIG. 1 is a first perspective view of a drum brake assembly having a first embodiment of an electric actuator assembly in accordance with the present invention.
  • FIG. 2 is second perspective view of the drum brake assembly of FIG. 1.
  • FIG. 3 is an exploded perspective view of the drum brake assembly of FIG. 1.
  • FIG. 4 is a section view taken along line 44 of FIG. 2.
  • FIG. 5 is a section view taken along line 5-5 of FIG. 3.
  • FIG. 6 is a section view taken along line 6-6 of FIG. 5.
  • FIG. 7 is a first perspective view of an alternate gear reduction for use with the electric actuator assembly of FIG. 1.
  • FIG. 8 is a second perspective view of the alternate gear reduction of FIG. 7.
  • FIG. 9 is a section view showing a linear translation assembly of the electric actuator assembly of FIG. 1.
  • FIG. 10 is a graph of electrical current drawn by the electric actuator assembly of FIG. 1.
  • FIG. 11 is an elevation view of the drum brake assembly of FIG. 1 with an alternate brake drum for use with the drum brake assembly of FIG. 1.
  • FIG. 12 is a perspective view of an alternate drum-in-hat adapter for use with the electric actuator assembly of FIG. 1.
  • FIG. 13 is a section view of a linear translation assembly of a second embodiment of an electric actuator assembly in accordance with the present invention.
  • FIG. 14 is a first perspective view of a third embodiment of an electric actuator assembly in accordance with the present invention.
  • FIG. IS is a second perspective view of the electric actuator assembly of FIG. 14.
  • FIG. 16 is an elevation view of the electric actuator assembly of FIG. 14.
  • FIGS. 17A-17C show an enlarged portion of FIG. 14.
  • FIGS. 1 -4 there is illustrated a drum brake assembly, indicated generally at 100, for a vehicle.
  • the drum brake assembly 100 has an electric actuator assembly, indicated generally at 102.
  • the general structure and operation of the drum brake assembly 100 is conventional in the art Thus, only those portions of the drum brake assembly 100 which are necessary for a full understanding of this invention will be explained and illustrated in detail. Also, although this invention will be described and illustrated in connection with the drum brake assembly 100, it will be appreciated that this invention may be used in connection with other vehicle brake assemblies, if so desired.
  • the drum brake assembly 100 is a drum-in-hat type drum brake assembly.
  • the drum brake assembly 100 and electric actuator assembly 102 are scalable and flexible for usage with vehicles of different sizes and classifications. As non-limiting examples, the drum brake assembly 100 and electric actuator assembly 102 may be scaled for use with different sizes of passenger cars, crossover vehicles, sport utility vehicles, light duty trucks, or heavy duty trucks. [0048]
  • the drum brake assembly 100 has first and second brake shoe and lining assemblies 104 A and 104B, respectively, and first and second shoe hold down clips 106A and 106B, respectively. Both an adjuster screw and nut assembly 108 and a lower shoe return spring 110 are operatively connected with the first and second brake shoe and lining assemblies 104 A and 104B,
  • the drum brake assembly 100 also has a splash shield 116, first and second shoe hold down pins 118A and 118B, respectively, a drum-in-hat adapter 120, and an adjusting hole cover 122.
  • the drum brake assembly 100 further has first and second upper shoe return springs 126A and 126B, respectively, connecting the first and second brake shoe and lining assemblies 104A and 104B, respectively.
  • the first and second brake shoe and lining assemblies 104A and 104B are selectively operable between braking and non-braking positions.
  • the first and second brake shoe and lining assemblies 104A and 104B contact and press against a brake drum 112 to slow or otherwise stop rotation of a wheel 114 (shown in FIG. 4) to which the brake drum 112 is rotationally fixed.
  • the first and second brake shoe and lining assemblies 104A and 104B do not contact the brake drum 112 and allow the wheel 114 to rotate freely.
  • the drum-in-hat adapter 120 is mounted to an axle case 124 so as to be rotationally fixed.
  • the electric actuator assembly 102 is a separate, self- contained unit mounted to the drum brake assembly 100 - e.g., the drum-in-hat adapter 120.
  • the electric actuator assembly 102 may be bolted or screwed to the drum-in-hat adapter 120.
  • the electric actuator assembly 102 comprises an electric motor 128, a gear reduction, indicated generally at 130, and a final drive gear nut 132 threaded on a spindle 134. Together, the gear nut 132 and the spindle 134 comprise a linear translation assembly, indicated generally at 136.
  • the linear translation assembly 136 has a normal screw thread between the gear nut 132 and the spindle 134.
  • the electric actuator assembly 102 is in a housing 138.
  • An electrical sensor 140 measures an electrical current drawn by the electric motor 128 from an electrical power supply 142.
  • the electric motor 128 has an output shaft 144 that rotationally drives an output or bevel gear 146.
  • the bevel gear 146 may be any suitable, high efficiency gear that can convert a rotation torque 148 of the output shaft 144 to the gear reduction 130 at a right angle.
  • a spiral bevel gear, crown gears, hypoid gears, or other types of gears with intersecting shafts may be used in place of the illustrated bevel gear 146.
  • a type of gear with non-intersecting shafts other than a worm gear as worm gears have low
  • the rotation torque 148 is illustrated as a counterclockwise torque in FIG. 5.
  • the rotation torque 148 will be clockwise or counterclockwise in FIG. 5 depending on which direction the electric motor 128 is operated.
  • the bevel gear 146 in turn drives a bevel input side ISO of a first reduction gear 1S2.
  • the first reduction gear 1S2 then drives a second reduction gear 1S4, which in turn drives a third reduction gear 156.
  • the gear reduction 130 is illustrated as three reduction gears - i.e., the first, second, and third reduction gears 1S2, 1S4, and 1S6, respectively - the gear reduction 130 may alternatively have more or less than three reduction gears.
  • the third reduction gear 1S6 drives an idler gear 158 that then drives the gear nut 132.
  • the first, second, and third reduction gears 152, 154, and 156, respectively, as well as the idler gear 158 are spur or helical gears.
  • the first, second, and third reduction gears 152, 154, and 156, respectively, and the idler gear 158 are rotationally mounted or otherwise supported by pins 160 - i.e., the first, second, and third reduction gears 152, 154, and 156, respectively, and the idler gear 158 rotate on the pins 160.
  • the gear reduction 130, as well as the idler gear 158, are between the electric motor 128 and the gear nut 132 - i.e., the gear reduction 130 is not at the electric motor 128 and the gear nut 132 is not driven by a worm gear at an end of an output shaft from the gear reduction 130.
  • the electric motor 128 is on a first axis 162.
  • the output shaft 144 extends along, and rotates on or about, the first axis 162.
  • the gear reduction 130 extends along a second axis 164 (the section line 6-6 in FIG. 5 is cut along the second axis 164).
  • the first axis 162 and the second axis 164 are perpendicular such that the electric motor 128 is mounted vertically relative to the drum brake assembly 100 in its installed position.
  • the electric actuator assembly 102 is interchangeable between the drum brake assemblies 100 for "left hand" and "right hand” positions or sides of the vehicle.
  • the left hand and right hand positions for the drum brake assembly 100 are industry standard and known to those skilled in the art
  • the left hand and right hand positions may be at opposite ends of a single axle.
  • the electric motor 128 is vertically above the gear reduction 130.
  • the electric motor 128 may be mounted vertically below the gear reduction 130.
  • the pins 160 are perpendicular to the second axis 164. As illustrated, the pins 160 are in a single plane, although such is not necessary. The plane having the pins 160 is perpendicular to the first axis 162.
  • the spindle 134 is rotationally fixed while permitted to translate along a third axis 166.
  • the third axis 166 is perpendicular to the first axis 162 and the second axis 164. As illustrated, the third axis 166 is also in the plane with the pins 160, although such is not necessary.
  • the gear nut 132 and the second connection portion 172 move in a second direction 174, wherein the second direction 174 is opposite the first direction 170.
  • Movement of the spindle 134 in the first direction 170 actuates or applies the first brake shoe and lining assembly 104A against the brake drum 112 and movement of the gear nut 132 in the second direction 174 actuates or applies the second brake shoe and lining assembly 104B against the brake drum 112.
  • the linear translation assembly 136 has the first connection portion 168 of the spindle 134 that operably connects the spindle 134 with the first brake shoe and lining assembly 104A.
  • the linear translation assembly 136 also has the second connection portion 172 of title gear nut 132 that operably connects the gear nut 132 with the second brake shoe and lining assembly 104B.
  • Each of the first and second connection portions 168 and 172, respectively, are U-shaped, notched, or otherwise shaped to prevent rotation of the spindle 134 when the gear nut 132 is rotated.
  • first connection portion 168 rotationally fixes the first connection portion 168 to the first brake shoe and lining assembly 104A and the shape of the second connection portion 172 rotationally fixes the second connection portion 172 to the second brake shoe and lining assembly 104B.
  • the shape of the first and second connection portions 168 and 172, respectively - i.e., non-rotation of the spindle 134 - provide a spread lock function for the drum brake assembly 100.
  • first or second connection portions 168 or 172 may be rotationally fixed to the first or second brake shoe and lining assembly 104 A or 104B, respectively, by other than the shape of the first or second connection portions 168 or 172, respectively.
  • first or second connection portions 168 or 172 may have a pin connection to the first or second brake shoe and lining assembly 104A and 104B, respectively.
  • a bevel spring pack 176 is positioned between the gear nut 132 and the second connection portion 172.
  • the bevel spring pack 176 takes up slack in the linear translation assembly 136.
  • the bevel spring pack 176 compresses when the gear nut 132 moves in the second direction 174.
  • FIGS. 7 and 8 there is illustrated an alternate gear reduction 130' for the electric actuator assembly 102.
  • the alternate gear reduction 130' includes an additional idler gear 178 between the first reduction gear 1S2 and the second reduction gear 154.
  • the additional idler gear 178 takes up a distance between shafts of the first and second reduction gears 152 and 154, respectively.
  • FIG. 7 further shows a housing split line 180 for the housing 138.
  • the gear nut 132 has an annular end face 182.
  • the spindle 134 has a stem portion 184 and a head portion 186 with an annular underside.
  • a spring member 188 Positioned between the end face 182 and the head portion 186 is a spring member 188.
  • the spring member 188 is between the gear nut 132 and the spindle 134 while being outside the gear nut 132.
  • the spring member 188 is compressed between the end face 182 and the head portion 186.
  • the spring member 188 is a Belleville washer type spring.
  • the spring member 188 may be other than as illustrated.
  • the spring member 188 may be fabricated from metal, plastic, or elastomer material.
  • FIG. 10 there is illustrated an electrical current 190 expected to be drawn by the electric motor 128 when the spindle 134 moves in the second direction 174 and the gear nut 132 moves in the first direction 170.
  • the electrical current 190 is measured by the electrical sensor 140.
  • the spring member 188 slowing movement of the gear nut 132 and the spindle 134 towards each other (by the spring member 188 compressing) results in a slower rate of increase for the electrical current 190.
  • the electric motor 128 When the electrical current 190 exceeds a threshold value 192, the electric motor 128 is turned off. A position of the gear nut 132 on the spindle 134 is proportional to the electrical current 190 when the electrical current 190 is less than the threshold value 192 - i.e., the position of the gear nut 132 on the spindle 134 is a function of the electrical current 190. Thus, the electric motor 128 may be turned off as a function of the position of the gear nut 132 on the spindle 134.
  • the electrical current 190 also has a second value 194 when the gear nut 132 first contacts or strikes a stop surface or other end stop 196 of the linear translation assembly 136.
  • the threshold value 192 is less than the second value 194.
  • the electrical current 190 increases at a greater rate than before the gear nut 132 contacts the stop surface 196.
  • the stop surface 196 is provided as formed in the housing 138.
  • the stop surface 196 may be otherwise provided.
  • the stop surface 196 may be provided on the spindle 134.
  • the electric motor 128 is turned off when the electrical current 190 exceeds the threshold value 192.
  • the threshold value 192 is set or otherwise calibrated such that the electric motor 128 is turned off before the gear nut 132 would contact the stop surface 196.
  • FIG. 10 also includes a second electrical current 198 shown by a dashed line.
  • the second electrical current 198 would be expected to be drawn by the electric motor 128 when the spindle 134 and the gear nut 132 move towards each other with the spring member 188 omitted. Without the spring member 188, the second electrical current 198 increases starting at a later time, when the gear nut 132 would first contact the stop surface, and at a greater rate than the electrical current 190.
  • the second electrical current 198 spikes or otherwise rapidly increases when the gear nut 132 contacts the stop surface 196.
  • FIG. 11 there is illustrated the drum brake assembly 100 with an alternate brake drum 112'.
  • the alternate brake drum 112' is configured for a dual rear wheel arrangement of two adjoining wheels and tires - i.e., a "dually" wheel configuration common for heavy duty pickup trucks.
  • FIG. 12 there is illustrated an alternate drum-in- hat adapter 120' for use with the electric actuator assembly 102.
  • the alternate drum-in-hat adapter 120' has a first face 200 and a second face 202.
  • a side surface 204 connects the first and second faces 200 and 202, respectively.
  • the alternate drum-in-hat adapter 120' includes a notch, indicated generally at 206, and an axle opening 208.
  • the axle opening 208 extends between the first and second faces 200 and 202, respectively, and is configured for the axle case 124 to extend through.
  • the axle opening 208 is centered about an axle axis 210 along which the axle case 124 extends.
  • the first and second faces 200 and 202, respectively, are substantially perpendicular to the axle axis 210 and the side surface 204 is substantially parallel to the axle axis 210.
  • the notch 206 extends radially inward from the side surface 204 and towards the axle axis 210 in a radial direction 214.
  • the radial direction 214 is perpendicular to the axle axis 210.
  • the notch 206 has first, second, and third sides 216, 218, and 220, respectively, to form a generally rectangular or square shape.
  • the notch 206 may have other than the first, second, and third sides 216, 218, and 220, respectively, and/or other than a generally rectangular or square shape.
  • the electric actuator assembly 102 is inserted, mounted, or otherwise installed in the notch 206 by a motion in the radial direction 214. More specifically, the motion in the radial direction 214 may be an initial or primary motion. Preferably, the motion in the radial direction 214 is the only motion for installing the electric actuator assembly 102 in the notch 206. The electric actuator assembly 102 is not inserted, mounted, or otherwise installed in the notch 206 by an initial or primary motion that is parallel to the axle axis 210.
  • the notch 206 has a depth 222 from the side surface 204.
  • a first radial length 224 is from the axle axis 210 to the second side 218 of the notch 206.
  • the first radial length 224 is less than both second and third radial lengths 226 and 228, respectively, to the side surface 204 on either side of the notch 206.
  • One or more of the alternate gear reduction 130', alternate brake drum 112', and drum-in-hat adapter 120' may be used in combination with each other for the drum brake assembly 100. Furthermore, one or more of the alternate gear reduction 130', alternate brake drum 112', and drum-in-hat adapter 120' may be used in combination with each other for the drum brake assembly 100 with the spring member 188 omitted.
  • FIG. 13 there is illustrated a linear translation assembly 336 for use with a second embodiment of an electric actuator assembly, indicated generally at 302, in accordance with the present invention.
  • the electric actuator assembly 302 is a variation of the electric actuator assembly 102 described with reference to FIGS. 1-12. As such, like reference numerals, increased by 200, designate corresponding parts in the drawings and detailed description thereof will be omitted, unless otherwise noted.
  • a gear nut 332 has a base portion 430.
  • a spindle 334 has a stem portion 384 with a tip portion 432.
  • a spring member 388 Positioned between the base portion 430 and the tip portion 432 is a spring member 388.
  • the spring member 388 is between the gear nut 332 and the spindle 334 while being inside the gear nut 332.
  • the spring member 388 may be a coil or helical type spring.
  • an electric actuator assembly indicated generally at 502, in accordance with the present invention.
  • the electric actuator assembly 502 is a variation of the electric actuator assembly 102 described with reference to FIGS. 1-12. As such, like reference numerals, increased by 400, designate corresponding parts in the drawings and detailed description thereof will be omitted, unless otherwise noted.
  • the electric actuator assembly 502 uses the linear translation assembly 136 of FIG. 9, the linear translation assembly 336 of FIG. 13, or some other linear translation assembly with a spring member between a gear nut and a spindle.
  • the electric actuator assembly 502 has an external drive connection port, indicated generally at 634.
  • the external drive connection port 634 is for emergency release of a drum brake assembly having the electric actuator assembly 502.
  • the external drive connection port 634 allows connection of an external driving means to mechanically rotate an electric motor 528 and actuate the drum brake assembly.
  • the external driving means may be a manually operated wrench or an external electric motor.
  • the electric actuator assembly 502 has a housing 538.
  • the housing 538 has a housing split line 580. Separate first and second housing parts 538A and 538B, respectively, are joined at the housing split line 580 to form the housing 538.
  • the housing split line 580 is offset from the external drive connection port 634. As such, the external drive connection port 634 is fully within the first housing part S38A.
  • the external drive connection port 634 has a protective outer cap 636.
  • the outer cap 636 may be a rubber cap that fixes over an annular ridge 638 (shown in FIG. 17B).
  • Beneath the outer cap 636 is a dust seal 640.
  • the dust seal 640 may be a plastic or foil seal. Beneath the dust seal 640 is a socket 642 to receive the external driving means.

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

Abstract

L'ensemble actionneur électrique pour ensemble frein à tambour comprend un moteur électrique ayant un arbre de sortie, une démultiplication entraînée par l'arbre de sortie, un ensemble de translation linéaire et une partie de liaison de l'ensemble de translation linéaire. La partie de liaison est conçue pour actionner et libérer sélectivement une mâchoire de frein et un ensemble garniture de l'ensemble frein à tambour. L'ensemble de translation linéaire comprend un écrou d'engrenage entraîné par la démultiplication et un axe fixé de manière rotative. L'ensemble de translation linéaire effectue une translation linéaire lorsque l'écrou d'engrenage est entraîné. Un élément formant ressort est placé entre l'écrou d'engrenage et l'axe. Un capteur électrique mesure un courant électrique absorbé par le moteur électrique. Le moteur électrique est désactivé en fonction du courant électrique.
PCT/US2018/067494 2017-12-28 2018-12-26 Ensemble actionneur électrique pour ensemble frein à tambour WO2019133600A1 (fr)

Applications Claiming Priority (2)

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US201762610981P 2017-12-28 2017-12-28
US62/610,981 2017-12-28

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6360852B1 (en) * 2000-07-31 2002-03-26 Robert Bosch Corporation Drum-in-hat park brake assembly
US20100243387A1 (en) * 2007-11-21 2010-09-30 Herbert Vollert Electromechanical friction brake
US20130285494A1 (en) * 2010-12-21 2013-10-31 Linak A/S Linear actuator
US20140020997A1 (en) * 2011-02-02 2014-01-23 Continental Teves Ag & Co. Ohg Drum brake module which can be operated by electric motor
US20150120163A1 (en) * 2013-10-31 2015-04-30 Hitachi Automotive Systems, Ltd. Brake apparatus

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6360852B1 (en) * 2000-07-31 2002-03-26 Robert Bosch Corporation Drum-in-hat park brake assembly
US20100243387A1 (en) * 2007-11-21 2010-09-30 Herbert Vollert Electromechanical friction brake
US20130285494A1 (en) * 2010-12-21 2013-10-31 Linak A/S Linear actuator
US20140020997A1 (en) * 2011-02-02 2014-01-23 Continental Teves Ag & Co. Ohg Drum brake module which can be operated by electric motor
US20150120163A1 (en) * 2013-10-31 2015-04-30 Hitachi Automotive Systems, Ltd. Brake apparatus

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