WO2018155655A1 - Dispositif de frein à tambour - Google Patents

Dispositif de frein à tambour Download PDF

Info

Publication number
WO2018155655A1
WO2018155655A1 PCT/JP2018/006820 JP2018006820W WO2018155655A1 WO 2018155655 A1 WO2018155655 A1 WO 2018155655A1 JP 2018006820 W JP2018006820 W JP 2018006820W WO 2018155655 A1 WO2018155655 A1 WO 2018155655A1
Authority
WO
WIPO (PCT)
Prior art keywords
lever
pressing
brake device
brake
disposed
Prior art date
Application number
PCT/JP2018/006820
Other languages
English (en)
Japanese (ja)
Inventor
吉川　和宏
Original Assignee
曙ブレーキ工業株式会社
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 曙ブレーキ工業株式会社 filed Critical 曙ブレーキ工業株式会社
Publication of WO2018155655A1 publication Critical patent/WO2018155655A1/fr

Links

Images

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
    • 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
    • F16D51/16—Brakes with outwardly-movable braking members co-operating with the inner surface of a drum or the like shaped as brake-shoes pivoted on a fixed or nearly-fixed axis
    • F16D51/18—Brakes with outwardly-movable braking members co-operating with the inner surface of a drum or the like shaped as brake-shoes pivoted on a fixed or nearly-fixed axis with two brake-shoes
    • F16D51/20—Brakes with outwardly-movable braking members co-operating with the inner surface of a drum or the like shaped as brake-shoes pivoted on a fixed or nearly-fixed axis with two brake-shoes extending in opposite directions from their pivots
    • F16D51/22—Brakes with outwardly-movable braking members co-operating with the inner surface of a drum or the like shaped as brake-shoes pivoted on a fixed or nearly-fixed axis with two brake-shoes extending in opposite directions from their pivots mechanically actuated
    • 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
    • F16D65/38—Slack adjusters
    • F16D65/40—Slack adjusters mechanical
    • F16D65/52—Slack adjusters mechanical self-acting in one direction for adjusting excessive play
    • F16D65/56—Slack adjusters mechanical self-acting in one direction for adjusting excessive play with screw-thread and nut

Definitions

  • the present invention relates to a drum brake device.
  • the drum brake device 500 of this type has a backing plate 501 and one end side proximity of the first brake shoe 503 and the second brake shoe 505 along the arc of the first web 507 and the second web 509.
  • a lever input portion 521 is disposed between the second web 509 and the backing plate 501, and a tensile force is applied to the parking cable 523 connected to the lever input portion 521 to rotate the rotary base 519, thereby rotating the rotary base 519.
  • this drum brake device 500 when the parking lever 529 in the parking brake mechanism is arranged in a cross pull type, the parking lever 529 is housed in the backing plate 501, whereby the backing plate lead-out portion 531 of the parking cable 523 is obtained.
  • the structure can be easily laid out.
  • the lever 529 in order to fit the parking lever 529 into the backing plate 501, the lever itself is set to be small. Moreover, in order to suppress the variation in lever ratio, the lever ratio is set to be lower than that of the forward pull type (small lever ratio). Therefore, as shown in FIG. 13, the parking lever 529 is disposed between the backing plate 501 and the second web 509 and between the back plate 533 of the second brake shoe 505 and the rotational axis 535 of the wheel. It is done. That is, the parking lever 529 is disposed in a radial area centered on the rotation axis 535. As a result, the lever pulling force increases with respect to the forward pull type, and the reaction force input to the backing plate 501 increases. Therefore, the backing plate 501 needs to have high strength, and a large drive mechanism (motor gear unit) is required to motorize the parking brake mechanism.
  • a large drive mechanism motor gear unit
  • the present invention has been made in view of the above circumstances, and an object thereof is to provide a drum having a parking brake mechanism which can increase the lever ratio of a lever for expanding a pair of brake shoes and reduce the force for rotating the lever. It is in providing a brake device.
  • a pair of brake shoes disposed so as to be spreadable on a surface parallel to the backing plate so as to face the inner peripheral surface of the brake drum, and disposed between one end of the webs of the pair of brake shoes And a pressing and expanding mechanism having a lever for operating the pressing mechanism to spread and open the pair of brake shoes, wherein the rotary base of the lever is disposed in the vicinity of one of the brake shoes and extends from the rotary base
  • a drum brake device having a parking brake mechanism in which a lever input portion is disposed in the vicinity of the other brake shoe.
  • the rotary base of the lever in the pressing and expanding mechanism is disposed in the vicinity of one brake shoe, and the lever input portion is disposed in the vicinity of the other brake shoe. Therefore, the lever itself can be made long, and the distance from the rotary base to the lever input portion can be made long, so the lever ratio can be made large.
  • the lever input portion is disposed between the web opposite to the rotary base and the backing plate, the lever and the inner edge portion of the web Interference is avoided. Therefore, the lever whose interference with the inward edge is avoided can move radially outward of the wheel rotation axis. Therefore, the drive position of the drive member connected to the lever input portion of the lever can also be moved to the outer side in the radial direction than the rotation axis side of the wheel, so the drive member can be easily laid out. As a result, the drive mechanism such as a motor gear unit connected to the drive member can also move radially outward from the wheel rotation axis center side, and interference with other members is less likely to occur.
  • the lever itself can be further lengthened, and the distance from the rotary base to the lever input portion can be further lengthened, so that the lever ratio can be further increased.
  • the press and spread mechanism includes a first press member and a second press member disposed between the pair of the webs.
  • the rotary base is rotatably supported by the first pressing member, and the lever input portion is disposed between the web on the second pressing member side and the backing plate, and the lever input portion
  • the drum brake device in which the lever pressing portion of the lever presses the second pressing member to expand the pair of brake shoes by applying an external force and rotating the rotary base.
  • the first pressing member and the second pressing member are disposed between the pair of webs.
  • the rotation base of the lever is supported by the first pressing member.
  • the lever whose external force is input to the lever input portion rotates about the rotation base supported by the first pressing member, and the lever pressing portion presses the second pressing member away from the first pressing member. Therefore, the first pressing member and the second pressing member are separated, and the pair of brake shoes in contact with the both ends is expanded.
  • the lever input portion is disposed between the web and the backing plate on the second pressing member side.
  • the rotary base of the lever is disposed on the opposite side of the lever input portion across the brake central axis.
  • the pressing member is disposed between the pair of webs.
  • the lever is rotatably supported at the rotary base in the vicinity of the pressing mechanism that abuts one of the webs.
  • the lever has a lever pressing portion in the vicinity of the rotary base.
  • the lever input portion is disposed on the opposite side of the lever pressing portion with respect to the brake central axis.
  • a lever pressing portion in the vicinity of the rotary base abuts on one web.
  • the lever input portion is disposed between the other web and the backing plate, and the rotary base is disposed on the opposite side of the lever input portion across the brake center axis.
  • the lever can be arranged at high density (without wasting space) while avoiding interference with other members.
  • the drum brake device of the configuration of (5) when the movement amount of the pair of brake shoes at the time of braking is expanded due to the wear of the brake shoes, the full length dimension of the adjuster automatically becomes long. As a result, the standby positions of the pair of brake shoes at the time of non-braking are separated. As a result, the total dimension of the pair of shoe gaps on both sides is maintained substantially constant.
  • the lever input portion intersects with the driving direction with respect to a driving member that applies an external force to the lever input portion.
  • the drum brake device connected so as to be movable in the opening direction of the pair of brake shoes.
  • the drive member and the lever are connected (surface contact) movable in the expanding direction of the pair of brake shoes.
  • the drive member is pulled by the drive of the motor gear unit, and the lever rotation external force can be input to the lever input portion by the pulled drive member, and the parking brake can be motorized. It becomes.
  • the lever is disposed between the wheel cylinder and the pressing mechanism. Then, the near space secured by arranging a wheel cylinder can be used effectively. As a result, the lever is less likely to interfere with the unevenness of the mounting portion of the vehicle, and the lever stroke when the lever rotates can be easily secured.
  • the lever ratio for expanding the pair of brake shoes can be increased, and the force for rotating the lever can be reduced.
  • FIG. 1 is a front view of a drum brake device according to a first embodiment of the present invention.
  • FIG. 2 is a cross-sectional view taken along the line AA of FIG.
  • FIG. 3 is a perspective view of the drum brake device shown in FIG. 1 with the wheel cylinder omitted.
  • FIG. 4 is a perspective view of the pressing and spreading mechanism shown in FIG.
  • FIG. 5 is an exploded perspective view of the pressing and spreading mechanism shown in FIG.
  • FIG. 6 is a front view of a drum brake device according to a second embodiment of the present invention.
  • FIG. 7 is a cross-sectional view taken along the line BB in FIG.
  • FIG. 8 is a perspective view of the drum brake device shown in FIG.
  • FIG. 9 is a perspective view of the pressing and spreading mechanism shown in FIG. FIG.
  • FIG. 10 is an exploded perspective view of the pressing and spreading mechanism shown in FIG.
  • FIG. 11 is a front view of a drum brake device according to a third embodiment of the present invention.
  • FIG. 12 is a cross-sectional view taken along the line CC in FIG.
  • FIG. 13 is a cross-sectional view of an essential part of a conventional drum brake device.
  • the drum brake device 100 is integrally fixed to the vehicle body in a posture in which the backing plate 11 is substantially perpendicular to the wheel rotation axis 13. Be done.
  • the backing plate 11 is formed with a predetermined strength by raising the outer peripheral edge portion of a circular substrate made of a thick metal plate as a peripheral wall.
  • a motor gear unit 15 for motorizing a parking brake is provided on the surface of the backing plate 11 on the vehicle side.
  • a pair of first brake shoes 17 and second brake shoes 19 each having an arc shape are disposed along the outer peripheral edge of the vehicle longitudinal direction side (the left and right direction side in FIG. 1).
  • the first brake shoe 17 and the second brake shoe 19 disposed on the backing plate 11 have the first web 23 (see FIG. 2) and the second web 25 fixed to the inner peripheral side of the back plate 21, respectively.
  • a lining 27 is fixed to the outer peripheral side of 21.
  • the first web 23 and the second web 25 face each other across the diameter of a virtual circle (not shown) centered on the wheel rotation axis 13 perpendicular to the backing plate 11 and arced on a plane parallel to the backing plate 11 Is formed.
  • a brake center shaft 29 an extension line of the above-described diameter sandwiched between the first web 23 and the second web 25 is referred to as a brake center shaft 29 (see FIG. 1).
  • the first and second brake shoes 17 and 19 are held by the shoe hold down device 31 so as to be able to open the backing plate 11.
  • the first brake shoe 17 and the second brake shoe 19 are disposed opposite to the inner peripheral surface of the brake drum 30 with the brake center shaft 29 interposed therebetween, and can be expanded on a surface parallel to the backing plate 11.
  • the pressing and expanding mechanism 35 of the parking brake mechanism 33 and And return springs 37 are disposed substantially horizontally.
  • the first brake shoe 17 is fixed to the backing plate 11.
  • An anchor portion 39 with which the other end of the second brake shoe 19 abuts, and a tension coil spring 41 are disposed substantially horizontally.
  • a wheel cylinder 43 is interposed between one end of the first brake shoe 17 and the second brake shoe 19 at the upper side of FIG. 1.
  • the wheel cylinder 43 is attached to the backing plate 11, and is pushed apart between the one end portions by the first piston 42 and the second piston 44 to expand the first brake shoe 17 and the second brake shoe 19
  • Let The wheel cylinder 43 rotates the contact between the first brake shoe 17 and the second brake shoe 19 with the anchor portion 39 by the first piston 42 and the second piston 44 advancing from both ends at the time of service brake by stepping on the foot brake pedal.
  • the first brake shoe 17 and the second brake shoe 19 which are spread and rotated frictionally engage with the inner peripheral surface of the brake drum 30 to brake the same.
  • the drum brake device 100 has a leading trailing structure in which the upper portion is opened with the lower anchor portion 39 as a fulcrum.
  • FIG. 2 is a cross-sectional view taken along line AA of FIG.
  • the parking brake mechanism 33 has the above-described pressing and spreading mechanism 35 and a driving member 45 driven by the motor gear unit 15.
  • the pressing and spreading mechanism 35 has a pressing mechanism 47 and a lever 49.
  • the pressing mechanism 47 is disposed between one end of the first web 23 and the second web 25.
  • the lever 49 operates the pressing mechanism 47 to widen the first brake shoe 17 and the second brake shoe 19.
  • FIG. 3 is a perspective view of the drum brake device shown in FIG. 1 with the wheel cylinder 43 omitted.
  • the rotary base 51 of the lever 49 is disposed in the vicinity of one first brake shoe 17, and the lever input portion 53 extending from the rotary base 51 is the other second brake shoe. It is arranged in the vicinity of 19. Further, the lever input portion 53 is disposed between the second web 25 positioned on the opposite side to the rotary base 51 and the backing plate 11 (see FIG. 2).
  • the lever 49 is disposed between the wheel cylinder 43 for expanding the pair of first brake shoes 17 and the second brake shoes 19 and the pressing mechanism 47.
  • FIG. 4 is a perspective view of the pressure spreading mechanism 35 shown in FIG. 3, and FIG. 5 is an exploded perspective view of the pressure spreading mechanism 35 shown in FIG.
  • the pressing mechanism 47 of the first embodiment has a first pressing member 55 and a second pressing member 57 disposed between the first web 23 and the second web 25.
  • the rotation base 51 of the lever 49 is rotatably supported by the first pressing member 55 via a lever pin 59.
  • the lever pin 59 has a head, and the insertion tip on the opposite side to the head penetrates the first pressing member 55 and the rotary base 51, and the snap ring 61 is attached to the penetration tip to prevent dropping.
  • the lever 49 is arranged such that the lever input portion 53 is between the second web 25 and the backing plate 11 on the second pressing member 57 side.
  • the lever pressing portion 63 (see FIG. 5) of the lever 49 presses the second pressing member 57 and the first brake shoe 17 and the second brake shoe 19 are expanded.
  • the drive member 45 is driven by the motor gear unit 15. An external force is applied to the lever input portion 53 by the drive member 45.
  • the driving member 45 is formed in a rectangular box shape having a lever insertion opening 65 as shown in FIGS. 4 and 5.
  • the lever 49 is inserted into the lever insertion opening 65 with play and the lever input portion 53 is engaged and connected to the drive member 45. That is, with respect to the drive member 45 which applies the external force to the lever input portion 53, the lever input portion 53 spreads the first brake shoe 17 and the second brake shoe 19 in the expanding direction (arrow a in FIG. 4). Direction) (the contact point with the drive member 45 is movable). Therefore, the tip of the lever input portion 53 has an outer periphery formed in an arc shape (see FIG. 2) centered on a center line in the same direction as the lever pin 59. The contact point of the lever input portion 53 and the drive member 45 moves on the outer periphery of the arc shape.
  • the pressing and spreading mechanism 35 has an adjuster 67 (see FIG. 1) for automatically adjusting the shoe interval.
  • the adjuster 67 has an adjuster socket 69, an adjuster gear 71, an adjuster nut 73, and an adjuster lever 75 (see FIG. 1).
  • the adjuster 67 adjusts a shoe interval between the first brake shoe 17 and the second brake shoe 19.
  • the adjuster 67 constitutes a part of the pressing mechanism 47.
  • the adjuster gear 71 extends the entire length of the adjuster 67 by rotation to make the brake shoe interval constant. One end of the adjuster gear 71 is screwed into the adjuster nut 73, and the other end is inserted into the adjuster socket 69. A toothed wheel 77 is formed in the middle.
  • the adjuster lever 75 has a claw portion 79 (see FIG. 1) opposed to the toothed wheel 77, and the timepiece shown in FIG. 1 centering on the adjuster pin 81 when the first brake shoe 17 and the second brake shoe 19 are opened.
  • the claw portion 79 is configured to abut on the toothed wheel 77 by rotating in a rotating direction.
  • the return spring 37 In the automatic shoe interval adjustment operation by the adjuster 67, the return spring 37 always exerts a force of rotating the adjuster lever 75 in the clockwise direction in FIG. 1 about the adjuster pin 81.
  • the first brake shoe 17 and the second brake shoe 19 move more than the specified stroke, and accordingly, when the amount of rotation of the adjuster lever 75 exceeds the specified amount, the claws 79 have toothed wheels It abuts on one of the teeth 77 and rotates the toothed wheel 77 by one tooth.
  • the adjuster 67 performs automatic adjustment of the shoe gap by extending.
  • the adjuster 67 separates the standby positions of the first brake shoe 17 and the second brake shoe 19 at the time of non-braking by keeping the overall length dimension longer, and maintains the shoe gap (total dimension of the shoe gap on both sides) substantially constant. Do.
  • the web engaging claw 85 engaged with the first web 23 is the opposite side of the gear fitting hole 83 into which the adjuster gear 71 is inserted.
  • the adjuster nut 73 is a lever / pressing portion engaging claw 89 engaged with the first pressing member 55 and the lever pressing portion 63 on the opposite side of the gear screwing portion 87 with which the adjuster gear 71 is screwed.
  • the first pressing member 55 has a nut engaging portion 91 engaged with the lever / pressing portion engaging claw 89, and the web engaging claw 93 engaged with the second web 25 on the opposite side of the nut engaging portion 91. It becomes.
  • the rotary base 51 of the lever 49 of the pressing and spreading mechanism 35 is disposed in the vicinity of the first brake shoe 17 and the lever input portion 53 is disposed in the vicinity of the second brake shoe 19. Be done. Therefore, the lever itself can be made long, and the distance from the rotary base 51 to the lever input portion 53 can be made long, so the lever ratio can be made large. Furthermore, since the lever input portion 53 is disposed between the second web 25 opposite to the rotary base 51 and the backing plate 11, the lever 49 interferes with the inward edge of the second web 25. Is avoided.
  • the lever 49 whose interference with the inward edge is avoided can be moved radially outward of the wheel rotation axis 13 side. Accordingly, the drive position of the drive member 45 connected to the lever input portion 53 of the lever 49 can also be moved to the outer side in the radial direction than the wheel rotation axis 13, so that the drive member 45 can be easily laid out. As a result, the motor gear unit 15 connected to the drive member 45 can also move radially outward from the wheel rotation axis 13 side, and interference with other members such as a brake mounting portion (hub) of the vehicle is less likely to occur. Become. Further, since the lever 49 itself can be further lengthened, and the distance from the rotary base 51 to the lever input portion 53 can be further lengthened, the lever ratio can be further increased.
  • the first pressing member 55 and the second pressing member 57 are disposed between the pair of first webs 23 and the second web 25.
  • the rotation base 51 of the lever 49 is supported by the first pressing member 55.
  • the lever 49 whose external force is input to the lever input portion 53 rotates about the rotation base 51 supported by the first pressing member 55, and the lever pressing portion 63 separates the second pressing member 57 from the first pressing member 55. Press in the direction of Accordingly, the first pressing member 55 and the second pressing member 57 are separated, and the pair of the first brake shoes 17 and the second brake shoes 19 which are in contact with these ends are expanded.
  • the lever input portion 53 is disposed between the second web 25 and the backing plate 11 on the second pressing member side. Further, the rotation base 51 of the lever 49 is disposed on the opposite side of the lever input portion 53 with the brake center shaft 29 interposed therebetween.
  • the lever 49 has a large size while avoiding interference with other members, with high density between the first web 23 and the second web 25 and the backing plate 11 (without wasting space). It can be arranged.
  • the total length dimension of the adjuster 67 becomes It gets longer automatically.
  • the standby positions of the pair of first brake shoes 17 and the second brake shoes 19 at the time of non-braking are separated.
  • the total dimension of the pair of shoe gaps on both sides is maintained substantially constant.
  • the drive member 45 and the lever 49 are connected (surface contact) in which the pair of first brake shoes 17 and the second brake shoes 19 can move in the expansion direction. It is assumed. As a result, the contact surface slides when the standby position of the pair of first brake shoes 17 and the second brake shoes 19 automatically adjusted by the adjuster 67 during non-braking and the positional deviation of the lever 49 when the lining 27 wears. It can absorb by doing. Therefore, it is not necessary to arrange a short cable or clevis for connecting the drive member 45 and the lever 49.
  • the driving member 45 is pulled by the drive of the motor gear unit 15, and the rotating external force can be input to the lever input portion 53 by the pulled driving member 45, and parking brake Can be easily realized.
  • the lever 49 is disposed between the wheel cylinder 43 and the pressing mechanism 47. Therefore, the near space secured by arranging the wheel cylinder 43 can be used effectively. As a result, the lever 49 is less likely to interfere with the unevenness of the mounting portion of the vehicle, and it becomes easier to secure the lever stroke when the lever 49 rotates.
  • the drum brake device 200 according to the second embodiment of the present invention includes a backing plate 11, an anchor portion 39, a motor gear unit 15, a drive member 45,
  • the wheel cylinder 43, the return spring 37 and the tension coil spring 41 are configured substantially the same as the drum brake device 100 according to the first embodiment. Therefore, in the following description, the parking brake mechanism 95 will be mainly described in detail, and the description of the other configuration of the drum brake device 200 equivalent to the above-described drum brake device 100 will be omitted.
  • the parking brake mechanism 95 has a pressing and spreading mechanism 97 and a drive member 45 driven by the motor gear unit 15.
  • the pressing and spreading mechanism 97 has a pressing mechanism 99 (see FIG. 9) and a lever 101.
  • the pressing mechanism 99 is disposed between one end of the first web 23 and the second web 25.
  • the lever 101 operates the pressing mechanism 99 to widen the first brake shoe 17 and the second brake shoe 19.
  • the rotary base 51 of the lever 101 is disposed in the vicinity of one of the first brake shoes 17 and extends from the rotary base 51 as in the first embodiment.
  • the lever input portion 53 is disposed in the vicinity of the other second brake shoe 19.
  • FIG. 9 is a perspective view of the pressing and spreading mechanism 97 shown in FIG. 8, and FIG. 10 is an exploded perspective view of the pressing and spreading mechanism 97 shown in FIG.
  • the pressing mechanism 99 of the second embodiment has a pressing member 105 disposed between the first web 23 and the second web 25.
  • the rotation base 51 of the lever 101 is rotatably supported by the support member 103 of the pressing member 105 via the lever pin 59.
  • the lever pin 59 has a head, and the insertion tip on the opposite side to the head penetrates the support member 103 and the rotary base 51, and the snap ring 61 is attached to the penetration tip to prevent dropping.
  • the lever 101 has a protruding lever pressing portion 107 shown in FIG. 7 on the outer periphery in the vicinity of the rotary base 51.
  • the lever pressing portion 107 directly abuts on the inner circumferential end surface of the first web 23 of the first brake shoe 17.
  • the lever 101 is disposed between the second web 25 and the backing plate 11 on the side opposite to the lever pressing portion 107 of the lever input portion 53.
  • the lever 101 applies an external force to the lever input portion 53 and the rotation base 51 is rotated, so that the lever pressing portion 107 of the lever 101 presses the first web 23 on the lever pressing portion side, and the first brake shoe 17 And open the second brake shoe 19.
  • the pressing and spreading mechanism 97 has an adjuster 109 (see FIG. 6) for automatically adjusting the shoe interval.
  • the adjuster 109 has an adjuster socket 111, an adjuster gear 71, an adjuster nut 113, and an adjuster lever 75 (see FIG. 6).
  • the adjuster 109 adjusts a shoe interval between the first brake shoe 17 and the second brake shoe 19.
  • the adjuster 109 constitutes a part of the pressing mechanism 99.
  • the adjuster gear 71 extends the full length of the adjuster 109 by rotation to make the brake shoe interval constant.
  • One end of the adjuster gear 71 is screwed into the adjuster nut 113, and the other end is inserted into the adjuster socket 111.
  • a toothed wheel 77 is formed in the middle.
  • the adjuster lever 75 has a claw 79 (see FIG. 6) facing the toothed wheel 77, and the timepiece of FIG. 6 is centered on the adjuster pin 81 when the first brake shoe 17 and the second brake shoe 19 are opened.
  • the claw portion 79 is configured to abut on the toothed wheel 77 by rotating in a rotating direction.
  • the adjuster 109 In the automatic shoe interval adjustment operation by the adjuster 109, as in the above-mentioned adjuster 67, when the wear amount of the lining 27 increases, the first brake shoe 17 and the second brake shoe 19 move over the prescribed stroke, and the adjuster lever accordingly When the amount of rotation of 75 exceeds the specified amount, the adjuster 109 is extended to automatically adjust the shoe gap.
  • the adjuster 109 separates the standby positions of the first brake shoe 17 and the second brake shoe 19 at the time of non-braking by keeping the overall length dimension longer, and maintains the shoe gap (total dimension of the shoe gap on both sides) substantially constant. Do.
  • the web engaging claw 115 engaged with the second web 25 is the opposite side of the gear fitting hole 83 into which the adjuster gear 71 is inserted.
  • the adjuster nut 113 is integrally fixed to the support member 103 on the opposite side of the gear screwing portion 87 with which the adjuster gear 71 is screwed.
  • the opposite side of the adjuster nut 113 is a web engagement claw 117 engaged with the first web 23.
  • the pressing member 105 is disposed between the first web 23 and the second web 25.
  • the rotary base 51 is rotatably supported via a lever pin 59 on a portion (support member 103) of the pressing mechanism 99 in contact with one of the first webs 23 of the lever 101.
  • the lever 101 has a lever pressing portion 107 in the vicinity of the rotary base 51.
  • the lever input portion 53 is disposed on the opposite side of the lever pressing portion 107 with the brake center shaft 29 interposed therebetween.
  • the lever pressing portion 107 in the vicinity of the rotation base abuts on one of the first webs 23.
  • the lever pressing portion 107 directly presses one of the first webs 23 to open the first brake shoe 17 and the second brake shoe 19. .
  • the lever input portion 53 is disposed between the second web 25 and the backing plate 11, and the rotary base 51 is disposed on the opposite side of the lever input portion 53 with the brake center shaft 29 interposed therebetween.
  • the lever 101 can be arranged at high density (without wasting space) while avoiding interference with other members.
  • the drum brake device 300 includes the backing plate 11 and the anchor portion except for the parking brake mechanism 207 and the auto adjuster (shoe gap automatic adjusting mechanism) 221.
  • the motor gear unit 15, the drive member 45, the wheel cylinder 43, the return spring 37, the tension coil spring 41, and the like are configured substantially the same as the drum brake device 200 according to the second embodiment. Therefore, in the following description, the parking brake mechanism 207 and the auto adjuster 221 will be mainly described in detail, and the description of the other configuration of the drum brake device 300 equivalent to the above-described drum brake device 200 will be omitted.
  • the parking brake mechanism 207 has a pressing and spreading mechanism 205 and a drive member 45 driven by the motor gear unit 15.
  • the pressing and spreading mechanism 205 has a pressing mechanism 203 (see FIG. 12) and a lever 201.
  • the pressing mechanism 203 is disposed between one end of the first web 23 and the second web 25.
  • the lever 201 operates the pressing mechanism 203 to spread the first brake shoe 17 and the second brake shoe 19.
  • the pressing mechanism 203 of the third embodiment has a pressing member 209 disposed between the first web 23 and the second web 25.
  • the rotary base 51 is rotatably supported via a lever pin 59 at an end of the pressing member 209 on the first brake shoe 17 side.
  • the lever pin 59 has a head, and the insertion tip on the opposite side to the head penetrates the pressing member 209 and the rotation base 51, and the snap ring 61 is attached to the penetration tip to prevent dropping.
  • the lever 201 has a projecting lever pressing portion 107 shown in FIG. 12 on the outer periphery in the vicinity of the rotary base 51.
  • the lever pressing portion 107 directly abuts on the inner circumferential end surface of the first web 23 of the first brake shoe 17.
  • the lever input portion 53 is disposed in the vicinity of the second web 25 on the side opposite to the lever pressing portion 107.
  • the lever 201 applies an external force to the lever input portion 53 and the rotation base 51 is rotated, so that the lever pressing portion 107 of the lever 201 presses the first web 23 on the lever pressing portion side, and the first brake shoe 17 And open the second brake shoe 19.
  • the rotary base 51 of the lever 201 is disposed in the vicinity of one first brake shoe 17 as in the second embodiment described above.
  • the extending lever input portion 53 is disposed in the vicinity of the other second brake shoe 19 with the brake center shaft 29 interposed therebetween.
  • lever input portion 53 which extends parallel to the backing plate 11 from the rotary base 51 and is disposed in the vicinity of the second brake shoe 19 is disposed more inward than the second web 25 on the second brake shoe 19 side. ing.
  • the lever insertion opening 65 of the drive member 45 is disposed on the side opposite to the backing plate 11 with respect to the second web 25.
  • an automatic adjuster 221 for adjusting the shoe interval is provided between the adjacent ends of the first brake shoe 17 and the second brake shoe 19 in the vicinity of the wheel cylinder 43.
  • the pressing member 209 is interposed (see FIG. 12). The pressing member 209 is moved to the inside of the first brake shoe 17 following the rotation of the lever 201.
  • the auto adjuster 221 is a shoe gap automatic adjusting mechanism, and defines a standby position of the first brake shoe 17 and the second brake shoe 19 at the time of non-braking.
  • the auto adjuster 221 includes a guide plate 225 fixed to the second web 25 of the second brake shoe 19, a wedge plate 223 interposed between one end 209a of the pressing member 209 and the guide plate 225, and a wedge plate A tension coil spring 227 biases 223 toward the other adjacent end of the second brake shoe 19, and a tension coil spring 229 biases the pressing member 209 toward the guide plate 225.
  • the auto adjuster 221 changes the standby position of the first brake shoe 17 and the second brake shoe 19 according to the wear of the friction material. That is, when the amount of movement of the first brake shoe 17 and the second brake shoe 19 during braking is increased due to the wear of the friction material, the guide plate 225 fixed to the second brake shoe 19 is pressed via the wedge plate 223 The distance between one end portion 209a of the pressing member 209 and the guide plate 225 is increased, and the standby positions of the first brake shoe 17 and the second brake shoe 19 at the time of non-braking are spaced apart. The dimensions are maintained substantially constant.
  • the rotary base 51 of the lever 201 rotatably supported at the end on the first brake shoe 17 side of the pressing member 209 is disposed in the vicinity of the first brake shoe 17
  • the lever input portion 53 is disposed in the vicinity of the second brake shoe 19. Therefore, the lever itself can be made long, and the distance from the rotary base 51 to the lever input portion 53 can be made long, so the lever ratio can be made large.
  • the lever input portion 53 is disposed inside the second web 25 on the second brake shoe 19 side, and the lever insertion opening 65 of the drive member 45 is on the opposite side to the backing plate 11 with respect to the second web 25. Is located in Therefore, the lever input portion 53 can secure a sufficient clearance with the backing plate 11, and the stroke amount of the lever 201 can be increased.
  • the levers 49, 101 that open the pair of first and second brake shoes 17, 19 are expanded.
  • 201 can be made large, and the force to rotate the levers 49, 101, 201 can be made small.
  • the configuration of the present invention exhibits the same effect as described above even when applied to a manual parking brake mechanism.
  • the present application is based on Japanese Patent Application (Japanese Patent Application No. 2017-032279) filed on February 23, 2017, the contents of which are incorporated herein by reference.
  • a pair of brake shoes (a first brake shoe 17 and a second brake shoe which are disposed so as to be spreadable on a surface parallel to the backing plate (11) so as to face the inner peripheral surface of the brake drum (30) 19) and Operates the pressing mechanism (47, 99, 203) disposed between one end of the webs (first web 23 and second web 25) of the pair of brake shoes (first brake shoe 17 and second brake shoe 19)
  • a pressing and opening mechanism (35, 97, 205) having levers (49, 101, 201) for causing the pair of brake shoes (the first brake shoe 17 and the second brake shoe 19) to widen;
  • a rotary base (51) of the lever (49, 101, 201) is disposed in the vicinity of one of the brake shoes (first brake shoe 17), and a lever input portion (53) extending from the rotary base (51)
  • a drum brake device (100, 200, 300) having a parking brake mechanism (33, 95, 20
  • the lever (49) is disposed between the second web 25 and the backing plate (11), and an external force is applied to the lever input portion (53) to rotate the rotary base (51).
  • the pressing and spreading mechanism (97) has a pressing member (105) disposed between the pair of the webs (the first web 23 and the second web 25) and a lever pressing portion (107) of the lever (101).
  • the rotary base (51) is rotatably supported by the pressing member (105), and the web on the opposite side of the lever input portion (53) to the lever pressing portion (107)
  • the lever pressing portion (107) is disposed between the second web 25) and the backing plate (11), and an external force is applied to the lever input portion (53) to rotate the rotary base (51).
  • drum brake device of the present invention it is possible to provide a drum brake device capable of increasing the lever ratio for expanding the pair of brake shoes and reducing the force for rotating the lever.

Landscapes

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

Abstract

L'invention concerne un dispositif de frein à tambour (100) comprenant : des premier et second sabots de frein (17, 19) disposés de manière extensible sur un plan parallèle à une plaque de support (11), les sabots étant agencés à travers l'axe central de frein en face à face, d'une manière opposée à la surface circonférentielle interne d'un tambour de frein ; et un mécanisme de pression/expansion (35) comprenant un levier (49) qui actionne un mécanisme de pression disposé entre des extrémités respectives d'une première et d'une seconde bande (23, 25) et qui étend ainsi les premier et second sabots de frein (17, 19). Le dispositif de frein à tambour comprend un mécanisme de frein de stationnement (33) dans lequel une partie de base rotative (51) du levier (49) est disposée à proximité du premier sabot de frein (17) et une partie d'entrée de levier (53) est disposée à proximité du second sabot de frein (19).
PCT/JP2018/006820 2017-02-23 2018-02-23 Dispositif de frein à tambour WO2018155655A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2017-032279 2017-02-23
JP2017032279A JP2018135989A (ja) 2017-02-23 2017-02-23 ドラムブレーキ装置

Publications (1)

Publication Number Publication Date
WO2018155655A1 true WO2018155655A1 (fr) 2018-08-30

Family

ID=63253923

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2018/006820 WO2018155655A1 (fr) 2017-02-23 2018-02-23 Dispositif de frein à tambour

Country Status (2)

Country Link
JP (1) JP2018135989A (fr)
WO (1) WO2018155655A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002242965A (ja) * 2001-02-16 2002-08-28 Nissan Motor Co Ltd ドラムブレーキのシュー拡張装置及びこのシュー拡張装置を有するドラムブレーキ
JP2013124696A (ja) * 2011-12-14 2013-06-24 Akebono Brake Ind Co Ltd ドラムブレーキ式電動駐車ブレーキ装置
JP2015152126A (ja) * 2014-02-17 2015-08-24 曙ブレーキ工業株式会社 パーキングブレーキ機構および電動パーキングブレーキ

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002242965A (ja) * 2001-02-16 2002-08-28 Nissan Motor Co Ltd ドラムブレーキのシュー拡張装置及びこのシュー拡張装置を有するドラムブレーキ
JP2013124696A (ja) * 2011-12-14 2013-06-24 Akebono Brake Ind Co Ltd ドラムブレーキ式電動駐車ブレーキ装置
JP2015152126A (ja) * 2014-02-17 2015-08-24 曙ブレーキ工業株式会社 パーキングブレーキ機構および電動パーキングブレーキ

Also Published As

Publication number Publication date
JP2018135989A (ja) 2018-08-30

Similar Documents

Publication Publication Date Title
WO2014017552A1 (fr) Dispositif de frein à tambour
JP2004360761A (ja) ドラムブレーキ装置
US8322496B2 (en) Mechanical drum brake
WO2018155655A1 (fr) Dispositif de frein à tambour
KR102500878B1 (ko) 차량용 드럼 브레이크장치
JP2008045655A (ja) ドラムブレーキ装置
JPS6223176B2 (fr)
JP2002147506A (ja) シュー間隙自動調節機構付きドラムブレーキ
JP4812689B2 (ja) シュー間隙自動調節機構を備えたドラムブレーキ
JP2015152126A (ja) パーキングブレーキ機構および電動パーキングブレーキ
JP2004068977A (ja) クサビ作動式ディスクブレーキ装置
JP6198889B1 (ja) 車両用ドラムブレーキ
JPS6113784Y2 (fr)
JP5950731B2 (ja) パーキングブレーキ機構および電動パーキングブレーキ
JP4813429B2 (ja) ドラムブレーキ装置
JP4555516B2 (ja) デュアルモードドラムブレーキ
JP3909254B2 (ja) ドラムブレーキ装置
JP2010133465A (ja) ドラムブレーキ装置
WO2018155657A1 (fr) Dispositif de frein à tambour
JP6491543B2 (ja) デュオサーボ型ドラムブレーキ
JP2018135988A (ja) ドラムブレーキ装置
JPH0529382Y2 (fr)
KR100387865B1 (ko) 주차브레이크의 케이블 장력조절장치
JP2007508509A (ja) ばね組体を有するスポットタイプディスクブレーキ
JP2007139023A (ja) ディスクブレーキ装置

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 18757828

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 18757828

Country of ref document: EP

Kind code of ref document: A1