WO2018155655A1 - Drum brake device - Google Patents

Drum brake device Download PDF

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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
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WO
WIPO (PCT)
Prior art keywords
lever
pressing
brake device
brake
disposed
Prior art date
Application number
PCT/JP2018/006820
Other languages
French (fr)
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/en

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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.

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

Abstract

This drum brake device (100) comprises: first and second brake shoes (17, 19) arranged in an expandable manner on a plane parallel to a backing plate (11), the shoes being arranged across the brake central axis from one another in a manner opposing the inner circumferential surface of a brake drum; and a pressing/expanding mechanism (35) including a lever (49) that actuates a pressing mechanism arranged between respective one ends of first and second webs (23, 25) and thereby expands the first and second brake shoes (17, 19). The drum brake device comprises a parking brake mechanism (33) in which a rotary base part (51) of the lever (49) is arranged near the first brake shoe (17) and a lever input part (53) is arranged near the second brake shoe (19).

Description

ドラムブレーキ装置Drum brake device
　本発明は、ドラムブレーキ装置に関する。 The present invention relates to a drum brake device.
　パーキングブレーキ機構のシュー拡張動作を電動により行うドラムブレーキ装置が知られている（特許文献１参照）。
　図１３に示すように、この種のドラムブレーキ装置５００は、バッキングプレート５０１と、第１ブレーキシュー５０３及び第２ブレーキシュー５０５における第１ウエブ５０７及び第２ウエブ５０９の円弧に沿う一端側の近接端同士に第１爪部５１１及び第２爪部５１３がそれぞれ当接する第１押圧部材５１５及び第２押圧部材５１７と、第１押圧部材５１５に回転自在に支持される回転基部５１９から延出するレバー入力部５２１が第２ウエブ５０９とバッキングプレート５０１の間に配置され、レバー入力部５２１に連結されたパーキングケーブル５２３に引張力が加えられて回転基部５１９が回転されることで回転基部５１９に突設された押圧部５２５が第２押圧部材５１７の被押圧部５２７を押圧するパーキングレバー５２９と、を備える。このドラムブレーキ装置５００によれば、パーキングブレーキ機構におけるパーキングレバー５２９をクロスプルタイプで配置した場合において、パーキングレバー５２９をバッキングプレート５０１内に格納することにより、パーキングケーブル５２３のバッキングプレート引出部５３１をレイアウトしやすい構造にできる。 There is known a drum brake device that electrically performs a shoe extension operation of a parking brake mechanism (see Patent Document 1).
As shown in FIG. 13, 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. It extends from a first pressing member 515 and a second pressing member 517 in which the first claw portion 511 and the second claw portion 513 respectively abut against each other, and a rotary base 519 rotatably supported by the first pressing member 515 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. A parking lever 529 in which a protruding pressing portion 525 presses a pressed portion 527 of the second pressing member 517; Provided. According to 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.
日本国特開２０１５－１５２１２６号公報Japanese Patent Laid-Open Publication No. 2015-152126
　しかしながら、上記従来のドラムブレーキ装置５００は、パーキングレバー５２９をバッキングプレート５０１内に収めるため、レバー自体が小さく設定されている。また、レバー比のバラツキを抑えるため、レバー比がフォワードプルタイプに対して下げた設定（小さなレバー比）とされている。このため、図１３に示すように、パーキングレバー５２９は、バッキングプレート５０１と第２ウエブ５０９との間で、且つ第２ブレーキシュー５０５の裏板５３３と車輪の回転軸心５３５との間に配置されている。即ち、回転軸心５３５を中心とする半径領域にパーキングレバー５２９が配置されている。その結果、フォワードプルタイプに対してレバー引き力が増大し、バッキングプレート５０１に入力される反力が増大する。このため、バッキングプレート５０１には高い強度が必要となると共に、パーキングブレーキ機構を電動化する際には大型の駆動機構（モータギアユニット）が必要になる。 However, in the conventional drum brake device 500, 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.
　本発明は上記状況に鑑みてなされたもので、その目的は、一対のブレーキシューを拡開するレバーのレバー比を大きく取ることができ、レバーを回転させる力を小さくできるパーキングブレーキ機構を有するドラムブレーキ装置を提供することにある。 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.
　本発明に係る上記目的は、下記構成により達成される。
（１）　ブレーキドラムの内周面に対向してバッキングプレートと平行な面上で拡開可能に配設される一対のブレーキシューと、前記一対のブレーキシューにおけるウエブの一方端間に配置された押圧機構を作動させて前記一対のブレーキシューを拡開するレバーを有する押圧拡開機構と、を備え、前記レバーの回転基部が一方の前記ブレーキシュー近傍に配置され、前記回転基部から延出するレバー入力部が他方の前記ブレーキシュー近傍に配置されるパーキングブレーキ機構を有するドラムブレーキ装置。 The above object of the present invention is achieved by the following constitution.
(1) 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.
　上記（１）の構成のドラムブレーキ装置によれば、押圧拡開機構におけるレバーの回転基部が一方のブレーキシュー近傍に配置され、レバー入力部が他方のブレーキシュー近傍に配置される。そこで、レバー自体を長くすることができ、回転基部からレバー入力部までの距離を長く取ることができるので、レバー比を大きく取ることができる。 According to the drum brake device of the above configuration (1), 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.
（２）　上記（１）に記載のドラムブレーキ装置であって、前記レバー入力部が、前記回転基部とは反対側に位置する前記ウエブと前記バッキングプレートの間に配置されるドラムブレーキ装置。 (2) The drum brake device according to (1), wherein the lever input portion is disposed between the web opposite to the rotary base and the backing plate.
　上記（２）の構成のドラムブレーキ装置によれば、レバー入力部が、回転基部とは反対側に位置するウエブとバッキングプレートの間に配置されるので、レバーは、ウエブの内方縁部との干渉が回避される。そこで、内方縁部との干渉が回避されたレバーは、車輪回転軸心側よりも半径方向外側への移動が可能となる。従って、レバーのレバー入力部と接続される駆動部材の駆動位置も車輪の回転軸心側よりも半径方向外側への移動が可能となるので、駆動部材がレイアウトし易くなる。その結果、駆動部材に接続されるモータギアユニット等の駆動機構も車輪回転軸心側よりも半径方向外側へ移動が可能となり、他部材との干渉が生じにくくなる。また、レバー自体を更に長くすることができ、回転基部からレバー入力部までの距離を更に長く取ることができるので、レバー比を更に大きく取ることができる。 According to the drum brake device of the configuration of the above (2), since 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. In addition, 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.
（３）　上記（１）又は（２）に記載のドラムブレーキ装置であって、前記押圧拡開機構は、一対の前記ウエブ間に配置された第１押圧部材及び第２押圧部材を有し、前記レバーは、前記第１押圧部材に前記回転基部が回転自在に支持されるとともに前記レバー入力部が前記第２押圧部材側における前記ウエブと前記バッキングプレートの間に配置され、前記レバー入力部に外力が加えられて前記回転基部が回転されることで、前記レバーのレバー押圧部が前記第２押圧部材を押圧して前記一対のブレーキシューを拡開するドラムブレーキ装置。 (3) In the drum brake device according to (1) or (2), the press and spread mechanism includes a first press member and a second press member disposed between the pair of the webs. In the lever, 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.
　上記（３）の構成のドラムブレーキ装置によれば、一対のウエブ間に第１押圧部材と第２押圧部材とが配置されている。レバーは、回転基部が第１押圧部材に支持されている。レバー入力部に外力が入力されたレバーは、第１押圧部材に支持される回転基部を中心に回転し、レバー押圧部が第２押圧部材を第１押圧部材から離間する方向に押圧する。従って、第１押圧部材と第２押圧部材とが離間し、これらの両端に当接する一対のブレーキシューを拡開する。ここで、レバーは、レバー入力部が、第２押圧部材側におけるウエブとバッキングプレートの間に配置されている。また、レバーの回転基部は、ブレーキ中心軸を挟んでレバー入力部の反対側に配置される。これにより、レバーは、他部材との干渉を回避しつつ大きく構成したものをウエブとバッキングプレートとの間で高密度に（無駄なスペースを空けることなく）配置できる。 According to the drum brake device of the above configuration (3), 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. Here, in the lever, the lever input portion is disposed between the web and the backing plate on the second pressing member side. In addition, the rotary base of the lever is disposed on the opposite side of the lever input portion across the brake central axis. As a result, the lever can be disposed at a high density (without wasting space) between the web and the backing plate, while avoiding interference with other members.
（４）　上記（１）又は（２）に記載のドラムブレーキ装置であって、前記押圧拡開機構は、一対の前記ウエブ間に配置された押圧部材及び前記レバーのレバー押圧部を有し、前記レバーは、前記押圧部材に前記回転基部が回転自在に支持されるとともに前記レバー入力部が前記レバー押圧部と反対側における前記ウエブと前記バッキングプレートの間に配置され、前記レバー入力部に外力が加えられて前記回転基部が回転されることで、前記レバー押圧部が前記レバー押圧部側における前記ウエブを押圧して前記一対のブレーキシューを拡開するドラムブレーキ装置。 (4) The drum brake device according to (1) or (2), wherein the pressing and spreading mechanism has a pressing member disposed between a pair of the webs and a lever pressing portion of the lever. The lever is rotatably supported on the rotary base by the pressing member and the lever input portion is disposed between the web and the backing plate on the side opposite to the lever pressing portion, and an external force is applied to the lever input portion. The drum brake device in which the lever pressing portion presses the web on the side of the lever pressing portion to expand the pair of brake shoes by the rotation base being rotated.
　上記（４）の構成のドラムブレーキ装置によれば、一対のウエブ間に押圧部材が配置される。レバーは、一方のウエブに当接する押圧機構の近傍部分に、回転基部が回転自在に支持される。レバーは、この回転基部の近傍にレバー押圧部を有する。また、レバー入力部は、ブレーキ中心軸を挟んでこのレバー押圧部の反対側に配置される。レバーは、回転基部近傍のレバー押圧部が一方のウエブに当接する。レバー入力部に外力が加えられて回転基部が回転されると、レバー押圧部が一方のウエブを直接押圧し、一対のブレーキシューを拡開する。ここで、上記のようにレバーは、レバー入力部が他方のウエブとバッキングプレートの間に配置され、回転基部がブレーキ中心軸を挟んでレバー入力部の反対側に配置される。これにより、レバーは、他部材との干渉を回避しつつ大きく構成したものを高密度に（無駄なスペースを空けることなく）配置できる。 According to the drum brake device of the configuration of (4), 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. Further, the lever input portion is disposed on the opposite side of the lever pressing portion with respect to the brake central axis. In the lever, a lever pressing portion in the vicinity of the rotary base abuts on one web. When an external force is applied to the lever input portion and the rotation base is rotated, the lever pressing portion directly presses one of the webs, and the pair of brake shoes is expanded. Here, as described above, in the lever, 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. As a result, the lever can be arranged at high density (without wasting space) while avoiding interference with other members.
（５）　上記（１）～（４）の何れか１つに記載のドラムブレーキ装置であって、前記押圧拡開機構が、シュー間隔を自動調整するためのアジャスタを有するドラムブレーキ装置。 (5) The drum brake device according to any one of the above (1) to (4), wherein the pressing and expanding mechanism has an adjuster for automatically adjusting a shoe interval.
　上記（５）の構成のドラムブレーキ装置によれば、ブレーキシューの摩耗により制動時の一対のブレーキシューの移動量が拡大すると、アジャスタの全長寸法が自動的に長くなる。これにより、非制動時の一対のブレーキシューの待機位置が離間される。その結果、一対の両側のシュー間隙の合計寸法が略一定に維持される。 According to 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.
（６）　上記（１）～（５）の何れか１つに記載のドラムブレーキ装置であって、前記レバー入力部が、前記レバー入力部に外力を加える駆動部材に対し、駆動方向と交差する前記一対のブレーキシューの拡開方向へ移動可能に連結されているドラムブレーキ装置。 (6) In the drum brake device according to any one of the above (1) to (5), 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.
　上記（６）の構成のドラムブレーキ装置によれば、駆動部材とレバーが、一対のブレーキシューの拡開方向へ移動可能な連結（面接触）とされている。これにより、アジャスタにより自動調整された一対のブレーキシューの非制動時の待機位置の変動やライニングの摩耗時におけるレバーの位置ズレは、接触面がスライドすることで吸収できる。そのため、駆動部材とレバーを連結するショートケーブルやクレビスを配置する必要がなくなる。 According to the drum brake device of the above configuration (6), the drive member and the lever are connected (surface contact) movable in the expanding direction of the pair of brake shoes. Thereby, the variation of the standby position of the pair of brake shoes automatically adjusted by the adjuster during non-braking and the positional deviation of the lever at the time of wear of the lining can be absorbed by the sliding of the contact surface. Therefore, it is not necessary to arrange a short cable or a clevis for connecting the drive member and the lever.
（７）　上記（６）に記載のドラムブレーキ装置であって、前記駆動部材が、モータギアユニットにより駆動されるドラムブレーキ装置。 (7) The drum brake device according to (6), wherein the drive member is driven by a motor gear unit.
　上記（７）の構成のドラムブレーキ装置によれば、モータギアユニットの駆動により駆動部材が引かれ、引かれた駆動部材によりレバー入力部にレバー回転外力を入力でき、パーキングブレーキの電動化が可能となる。 According to the drum brake device of the above configuration (7), 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.
（８）　上記（１）～（７）の何れか１つに記載のドラムブレーキ装置であって、前記レバーが、前記一対のブレーキシューを拡開するためのホイールシリンダと前記押圧機構との間に配置されているドラムブレーキ装置。 (8) The drum brake device according to any one of (1) to (7), wherein the lever is between a wheel cylinder for expanding the pair of brake shoes and the pressing mechanism. Drum brake device located in the.
　上記（８）の構成のドラムブレーキ装置によれば、ホイールシリンダと押圧機構の間にレバーが配置される。そこで、ホイールシリンダを配置することにより確保された近傍スペースを有効利用できる。これにより、車両の取り付け部の凹凸にレバーが干渉しにくくなり、レバーが回転する際のレバーストロークが確保しやすくなる。 According to the drum brake device of the above configuration (8), 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.
　本発明に係るパーキングブレーキ機構を有するドラムブレーキ装置によれば、一対のブレーキシューを拡開するレバー比を大きく取ることができ、レバーを回転させる力を小さくできる。 According to the drum brake device having the parking brake mechanism according to the present invention, the lever ratio for expanding the pair of brake shoes can be increased, and the force for rotating the lever can be reduced.
　以上、本発明について簡潔に説明した。更に、以下に説明される発明を実施するための形態（以下、「実施形態」という。）を添付の図面を参照して通読することにより、本発明の詳細は更に明確化されるであろう。 The present invention has been briefly described above. Furthermore, the details of the present invention will be further clarified by reading the modes for carrying out the invention described below (hereinafter referred to as "embodiments") with reference to the attached drawings. .
図１は、本発明の第１の実施形態に係るドラムブレーキ装置の正面図である。FIG. 1 is a front view of a drum brake device according to a first embodiment of the present invention. 図２は、図１のＡ－Ａ断面図である。FIG. 2 is a cross-sectional view taken along the line AA of FIG. 図３は、図１に示したドラムブレーキ装置のホイールシリンダを省略した斜視図である。FIG. 3 is a perspective view of the drum brake device shown in FIG. 1 with the wheel cylinder omitted. 図４は、図３に示した押圧拡開機構の斜視図である。FIG. 4 is a perspective view of the pressing and spreading mechanism shown in FIG. 図５は、図４に示した押圧拡開機構の分解斜視図である。FIG. 5 is an exploded perspective view of the pressing and spreading mechanism shown in FIG. 図６は、本発明の第２の実施形態に係るドラムブレーキ装置の正面図である。FIG. 6 is a front view of a drum brake device according to a second embodiment of the present invention. 図７は、図６のＢ－Ｂ断面図である。FIG. 7 is a cross-sectional view taken along the line BB in FIG. 図８は、図６に示したドラムブレーキ装置の斜視図である。FIG. 8 is a perspective view of the drum brake device shown in FIG. 図９は、図８に示した押圧拡開機構の斜視図である。FIG. 9 is a perspective view of the pressing and spreading mechanism shown in FIG. 図１０は、図９に示した押圧拡開機構の分解斜視図である。FIG. 10 is an exploded perspective view of the pressing and spreading mechanism shown in FIG. 図１１は、本発明の第３の実施形態に係るドラムブレーキ装置の正面図である。FIG. 11 is a front view of a drum brake device according to a third embodiment of the present invention. 図１２は、図１１のＣ－Ｃ断面図である。FIG. 12 is a cross-sectional view taken along the line CC in FIG. 図１３は、従来のドラムブレーキ装置の要部断面図である。FIG. 13 is a cross-sectional view of an essential part of a conventional drum brake device.
　以下、本発明に係る実施形態を図面を参照して説明する。
［第１の実施形態］
　図１～図３に示すように、本発明の第１の実施形態に係るドラムブレーキ装置１００は、バッキングプレート１１が車輪回転軸心１３に対して略垂直となる姿勢で車体に一体的に固定される。バッキングプレート１１は、厚肉の金属板からなる円形基板の外周縁部が周壁として起立されることにより、所定の強度を有して形成される。図２に示すように、バッキングプレート１１の車両側の面には、パーキングブレーキを電動化するためのモータギアユニット１５が設けられる。バッキングプレート１１には、それぞれ円弧形状となる一対の第１ブレーキシュー１７及び第２ブレーキシュー１９が車両前後方向側（図１中、左右方向側）の外周縁に沿って配設される。 Hereinafter, embodiments according to the present invention will be described with reference to the drawings.
First Embodiment
As shown in FIGS. 1 to 3, the drum brake device 100 according to the first embodiment of the present invention 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. As shown in FIG. 2, a motor gear unit 15 for motorizing a parking brake is provided on the surface of the backing plate 11 on the vehicle side. On the backing plate 11, 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).
　バッキングプレート１１に配設された第１ブレーキシュー１７及び第２ブレーキシュー１９は、それぞれ裏板２１の内周側に第１ウエブ２３（図２参照）及び第２ウエブ２５が固定され、裏板２１の外周側にライニング２７が固定されている。第１ウエブ２３及び第２ウエブ２５は、バッキングプレート１１に垂直な車輪回転軸心１３を中心とする仮想円（図示略）の直径を挟んで対向し、バッキングプレート１１と平行な面上で弧状に形成されている。なお、本明細書中においては、第１ウエブ２３及び第２ウエブ２５に挟まれる上記した直径の延長線を、ブレーキ中心軸２９と称する（図１、参照）。 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. In the present specification, 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).
　それぞれの第１ブレーキシュー１７及び第２ブレーキシュー１９は、シューホールドダウン装置３１によりバッキングプレート１１に拡開可能に保持される。第１ブレーキシュー１７及び第２ブレーキシュー１９は、ブレーキ中心軸２９を挟んでブレーキドラム３０の内周面に対向してバッキングプレート１１と平行な面上で拡開可能に配設される。 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.
　図１に示すように、第１ブレーキシュー１７及び第２ブレーキシュー１９の一方端間（具体的には図１の上側の端部間）には、パーキングブレーキ機構３３の押圧拡開機構３５と、リターンスプリング３７とがそれぞれ略水平に配設されている。一方、第１ブレーキシュー１７及び第２ブレーキシュー１９の他方の端部間（具体的には図１の下側の端部間）には、バッキングプレート１１に固定されて第１ブレーキシュー１７及び第２ブレーキシュー１９の他方の端部が当接するアンカ部３９と、引張コイルスプリング４１が略水平に配設されている。 As shown in FIG. 1, between the one end of the first brake shoe 17 and the second brake shoe 19 (specifically, between the upper end portions in FIG. 1), the pressing and expanding mechanism 35 of the parking brake mechanism 33 and And return springs 37 are disposed substantially horizontally. On the other hand, between the other ends of the first brake shoe 17 and the second brake shoe 19 (specifically, between the lower ends of FIG. 1), 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.
　更に、図１の上側における第１ブレーキシュー１７及び第２ブレーキシュー１９の一方の端部間には、ホイールシリンダ４３が介装される。ホイールシリンダ４３は、バッキングプレート１１に取り付けられ、第１ピストン４２及び第２ピストン４４により一方の端部間を離反方向に押動して第１ブレーキシュー１７と第２ブレーキシュー１９とを拡開させる。ホイールシリンダ４３は、フットブレーキペダルの踏み込みによるサービスブレーキ時、両端より進出する第１ピストン４２及び第２ピストン４４により、第１ブレーキシュー１７及び第２ブレーキシュー１９をアンカ部３９との当接点回りに拡開回転させる。拡開回転した第１ブレーキシュー１７及び第２ブレーキシュー１９は、ブレーキドラム３０の内周面に摩擦係合してこれを制動する。 Furthermore, 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. Spread and rotate. 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.
　即ち、本第１の実施形態によるドラムブレーキ装置１００は、下部のアンカ部３９を支点にして上部が開くリーディングトレーリング構造となっている。 That is, the drum brake device 100 according to the first embodiment has a leading trailing structure in which the upper portion is opened with the lower anchor portion 39 as a fulcrum.
　図２は図１のＡ－Ａ断面図である。
　パーキングブレーキ機構３３は、上記の押圧拡開機構３５と、モータギアユニット１５により駆動される駆動部材４５と、を有する。押圧拡開機構３５は、押圧機構４７と、レバー４９と、を有する。押圧機構４７は、第１ウエブ２３及び第２ウエブ２５の一方端間に配置される。レバー４９は、この押圧機構４７を作動させて第１ブレーキシュー１７及び第２ブレーキシュー１９を拡開する。 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.
　図３は図１に示したドラムブレーキ装置のホイールシリンダ４３を省略した斜視図である。
　パーキングブレーキ機構３３の押圧拡開機構３５は、レバー４９の回転基部５１が一方の第１ブレーキシュー１７近傍に配置され、この回転基部５１から延出するレバー入力部５３が他方の第２ブレーキシュー１９近傍に配置される。また、レバー入力部５３は、回転基部５１とは反対側に位置する第２ウエブ２５とバッキングプレート１１の間に配置される（図２参照）。 FIG. 3 is a perspective view of the drum brake device shown in FIG. 1 with the wheel cylinder 43 omitted.
In the pressing and spreading mechanism 35 of the parking brake mechanism 33, 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).
　また、ドラムブレーキ装置１００は、レバー４９が、一対の第１ブレーキシュー１７及び第２ブレーキシュー１９を拡開するためのホイールシリンダ４３と押圧機構４７との間に配置されている。 Further, in the drum brake device 100, 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.
　図４は図３に示した押圧拡開機構３５の斜視図、図５は図４に示した押圧拡開機構３５の分解斜視図である。
　より具体的には、本第１の実施形態の押圧機構４７は、第１ウエブ２３と第２ウエブ２５との間に配置された第１押圧部材５５及び第２押圧部材５７を有する。レバー４９は、第１押圧部材５５に回転基部５１がレバーピン５９を介して回転自在に支持されている。レバーピン５９は、頭部を有し、頭部と反対側の挿通先端が第１押圧部材５５と回転基部５１を貫通し、貫通先端に止め輪６１が装着されて脱落が規制される。 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.
More specifically, 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.
　また、レバー４９は、レバー入力部５３が第２押圧部材５７側における第２ウエブ２５とバッキングプレート１１の間に配置される。レバー４９は、レバー入力部５３に外力が加えられて回転基部５１が回転されることで、レバー４９のレバー押圧部６３（図５参照）が第２押圧部材５７を押圧して第１ブレーキシュー１７と第２ブレーキシュー１９を拡開する。 Further, 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. When the lever 49 is applied with an external force to the lever input portion 53 and the rotary base 51 is rotated, 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.
　本第１の実施形態に係るドラムブレーキ装置１００は、駆動部材４５が、モータギアユニット１５により駆動される。この駆動部材４５により、レバー入力部５３に外力を加える。 In the drum brake device 100 according to the first embodiment, 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.
　駆動部材４５は、図４及び図５に示すように、レバー挿入開口部６５を有する矩形箱状に形成される。レバー４９は、このレバー挿入開口部６５にレバー入力部５３が遊びを有して挿入されて、係合状態となって駆動部材４５と接続される。即ち、レバー入力部５３は、レバー入力部５３に外力を加える駆動部材４５に対し、駆動方向と交差する一対の第１ブレーキシュー１７及び第２ブレーキシュー１９の拡開方向（図４の矢印ａ方向）へ移動可能（駆動部材４５との接点が移動可能）に連結されている。そのため、レバー入力部５３の先端は、レバーピン５９と同方向の中心線を中心とした円弧形状（図２参照）で外周が形成される。レバー入力部５３と駆動部材４５とは、接点がこの円弧形状の外周を移動することになる。 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.
　また、本第１の実施形態に係るドラムブレーキ装置１００は、押圧拡開機構３５が、シュー間隔を自動調整するためのアジャスタ６７（図１参照）を有する。アジャスタ６７は、アジャスタソケット６９と、アジャスタギア７１と、アジャスタナット７３と、アジャスタレバー７５（図１参照）と、を有する。アジャスタ６７は、第１ブレーキシュー１７と第２ブレーキシュー１９とのシュー間隔を調整する。なお、アジャスタ６７は、押圧機構４７の一部を構成している。 Further, in the drum brake device 100 according to the first embodiment, 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.
　アジャスタギア７１は、回転によりアジャスタ６７の全長を伸長してブレーキシュー間隔を一定にする。アジャスタギア７１は、一端がアジャスタナット７３に螺合され、他端がアジャスタソケット６９に嵌挿され、中間部に歯付輪７７が形成される。アジャスタレバー７５は、歯付輪７７に対向する爪部７９（図１参照）を有し、第１ブレーキシュー１７及び第２ブレーキシュー１９の拡開動作時にアジャスタピン８１を中心に図１の時計回り方向に回転することにより爪部７９が歯付輪７７に当接するように構成されている。 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.
　アジャスタ６７によるシュー間隔自動調整動作では、常にリターンスプリング３７によりアジャスタレバー７５をアジャスタピン８１を中心に図１の時計回り方向に回転する力を作用させる。ライニング２７の摩耗量が増えると、第１ブレーキシュー１７及び第２ブレーキシュー１９は規定行程以上移動し、それに伴ってアジャスタレバー７５の回動量が規定量を超えると、爪部７９が歯付輪７７の一つの歯に当接し、歯付輪７７を一歯分だけ回転させる。これにより、アジャスタ６７は、伸長することでシュー間隙の自動調整を行う。アジャスタ６７は、全長寸法が長くなることにより、非制動時の第１ブレーキシュー１７及び第２ブレーキシュー１９の待機位置を離間し、シュー間隙（両側のシュー間隙の合計寸法）を略一定に維持する。 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. When the amount of wear of the lining 27 increases, 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. Thereby, 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.
　アジャスタソケット６９は、アジャスタギア７１が嵌挿されるギア嵌合孔８３の反対側が、第１ウエブ２３に係合するウエブ係合爪８５となる。アジャスタナット７３は、アジャスタギア７１が螺合するギア螺合部８７の反対側が、第１押圧部材５５及びレバー押圧部６３に係合するレバー・押圧部係合爪８９となる。第１押圧部材５５は、レバー・押圧部係合爪８９と係合するナット係合部９１を有し、ナット係合部９１の反対側が、第２ウエブ２５に係合するウエブ係合爪９３となる。 In the adjuster socket 69, 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.
　次に、上記した構成の作用を説明する。
　本第１の実施形態に係るドラムブレーキ装置１００では、押圧拡開機構３５におけるレバー４９の回転基部５１が第１ブレーキシュー１７近傍に配置され、レバー入力部５３が第２ブレーキシュー１９近傍に配置される。そこで、レバー自体を長くすることができ、回転基部５１からレバー入力部５３までの距離を長く取ることができるので、レバー比を大きく取ることができる。
　更に、レバー入力部５３が、回転基部５１とは反対側に位置する第２ウエブ２５とバッキングプレート１１の間に配置されるので、レバー４９は、第２ウエブ２５の内方縁部との干渉が回避される。そこで、内方縁部との干渉が回避されたレバー４９は、車輪回転軸心１３側よりも半径方向外側への移動が可能となる。従って、レバー４９のレバー入力部５３と接続される駆動部材４５の駆動位置も車輪回転軸心１３側よりも半径方向外側への移動が可能となるので、駆動部材４５がレイアウトし易くなる。その結果、駆動部材４５に接続されるモータギアユニット１５も車輪回転軸心１３側よりも半径方向外側へ移動が可能となり、車両のブレーキ取付部（ハブ）等の他部材との干渉が生じにくくなる。また、レバー４９自体を更に長くすることができ、回転基部５１からレバー入力部５３までの距離を更に長く取ることができるので、レバー比を更に大きく取ることができる。 Next, the operation of the above configuration will be described.
In the drum brake device 100 according to the first embodiment, 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. Therefore, 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.
　また、本第１の実施形態に係るドラムブレーキ装置１００では、一対の第１ウエブ２３と第２ウエブ２５の間に第１押圧部材５５と第２押圧部材５７とが配置されている。レバー４９は、回転基部５１が第１押圧部材５５に支持されている。レバー入力部５３に外力が入力されたレバー４９は、第１押圧部材５５に支持される回転基部５１を中心に回転し、レバー押圧部６３が第２押圧部材５７を第１押圧部材５５から離間する方向に押圧する。従って、第１押圧部材５５と第２押圧部材５７とが離間し、これらの両端に当接する一対の第１ブレーキシュー１７及び第２ブレーキシュー１９を拡開する。ここで、レバー４９は、図２に示すように、レバー入力部５３が、第２押圧部材側における第２ウエブ２５とバッキングプレート１１の間に配置されている。また、レバー４９の回転基部５１は、ブレーキ中心軸２９を挟んでレバー入力部５３の反対側に配置される。これにより、レバー４９は、他部材との干渉を回避しつつ大きく構成したものを第１ウエブ２３及び第２ウエブ２５とバッキングプレート１１との間で高密度に（無駄なスペースを空けることなく）配置することができる。 Further, in the drum brake device 100 according to the first embodiment, 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. Here, as shown in FIG. 2, in the lever 49, 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. As a result, 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.
　また、本第１の実施形態に係るドラムブレーキ装置１００では、ブレーキシューの摩耗により制動時の一対の第１ブレーキシュー１７及び第２ブレーキシュー１９の移動量が拡大すると、アジャスタ６７の全長寸法が自動的に長くなる。これにより、非制動時の一対の第１ブレーキシュー１７及び第２ブレーキシュー１９の待機位置が離間される。その結果、一対の両側のシュー間隙の合計寸法が略一定に維持される。 Further, in the drum brake device 100 according to the first embodiment, when the movement amount of the pair of first brake shoes 17 and the second brake shoes 19 at the time of braking is expanded due to the wear of the brake shoes, the total length dimension of the adjuster 67 becomes It gets longer automatically. As a result, 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. As a result, the total dimension of the pair of shoe gaps on both sides is maintained substantially constant.
　また、本第１の実施形態に係るドラムブレーキ装置１００では、駆動部材４５とレバー４９が、一対の第１ブレーキシュー１７及び第２ブレーキシュー１９の拡開方向へ移動可能な連結（面接触）とされている。これにより、アジャスタ６７により自動調整された一対の第１ブレーキシュー１７及び第２ブレーキシュー１９の非制動時の待機位置の変動やライニング２７の摩耗時におけるレバー４９の位置ズレは、接触面がスライドすることで吸収できる。そのため、駆動部材４５とレバー４９を連結するショートケーブルやクレビスを配置する必要がなくなる。 Further, in the drum brake device 100 according to the first embodiment, 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.
　そして、本第１の実施形態に係るドラムブレーキ装置１００では、モータギアユニット１５の駆動により駆動部材４５が引かれ、引かれた駆動部材４５によりレバー入力部５３に回転外力を入力でき、パーキングブレーキの電動化を容易に実現することができる。 Then, in the drum brake device 100 according to the first embodiment, 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.
　更に、本第１の実施形態に係るドラムブレーキ装置１００では、ホイールシリンダ４３と押圧機構４７の間にレバー４９が配置される。そこで、ホイールシリンダ４３を配置することにより確保された近傍スペースを有効利用できる。これにより、車両の取り付け部の凹凸にレバー４９が干渉しにくくなり、レバー４９が回転する際のレバーストロークが確保しやすくなる。 Furthermore, in the drum brake device 100 according to the first embodiment, 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.
［第２の実施形態］
　図６～図８に示すように、本発明の第２の実施形態に係るドラムブレーキ装置２００は、パーキングブレーキ機構９５を除き、バッキングプレート１１、アンカ部３９、モータギアユニット１５、駆動部材４５、ホイールシリンダ４３、リターンスプリング３７及び引張コイルスプリング４１が、上記第１の実施形態に係るドラムブレーキ装置１００とほぼ同様に構成されている。そのため、以下の説明では、主にパーキングブレーキ機構９５について詳述し、上記のドラムブレーキ装置１００と同等であるドラムブレーキ装置２００の他の構成についての説明は省略する。 Second Embodiment
As shown in FIGS. 6 to 8, the drum brake device 200 according to the second embodiment of the present invention, except for the parking brake mechanism 95, 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.
　パーキングブレーキ機構９５は、図７に示すように、押圧拡開機構９７と、モータギアユニット１５により駆動される駆動部材４５と、を有する。押圧拡開機構９７は、押圧機構９９（図９参照）と、レバー１０１と、を有する。押圧機構９９は、第１ウエブ２３及び第２ウエブ２５の一方端間に配置される。レバー１０１は、この押圧機構９９を作動させて第１ブレーキシュー１７及び第２ブレーキシュー１９を拡開する。 As shown in FIG. 7, 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.
　本第２の実施形態の押圧拡開機構９７も、上記の第１の実施形態と同様、レバー１０１の回転基部５１が一方の第１ブレーキシュー１７近傍に配置され、この回転基部５１から延出するレバー入力部５３が他方の第２ブレーキシュー１９近傍に配置される。 Similarly to the first embodiment, 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.
　図９は図８に示した押圧拡開機構９７の斜視図、図１０は図８に示した押圧拡開機構９７の分解斜視図である。
　より具体的には、本第２の実施形態の押圧機構９９は、第１ウエブ２３と第２ウエブ２５との間に配置された押圧部材１０５を有する。レバー１０１は、押圧部材１０５の支持部材１０３に回転基部５１がレバーピン５９を介して回転自在に支持される。レバーピン５９は、頭部を有し、頭部と反対側の挿通先端が支持部材１０３及び回転基部５１を貫通し、貫通先端に止め輪６１が装着されて脱落が規制される。 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.
More specifically, 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.
　レバー１０１は、回転基部５１の近傍の外周に、図７に示す突起状のレバー押圧部１０７を有する。このレバー押圧部１０７は、第１ブレーキシュー１７における第１ウエブ２３の内周端面に直接に当接する。レバー１０１は、レバー入力部５３がレバー押圧部１０７と反対側における第２ウエブ２５とバッキングプレート１１の間に配置される。レバー１０１は、レバー入力部５３に外力が加えられて回転基部５１が回転されることで、レバー１０１のレバー押圧部１０７がレバー押圧部側における第１ウエブ２３を押圧して第１ブレーキシュー１７と第２ブレーキシュー１９を拡開する。 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.
　本第２の実施形態に係るドラムブレーキ装置２００は、押圧拡開機構９７が、シュー間隔を自動調整するためのアジャスタ１０９（図６参照）を有する。アジャスタ１０９は、アジャスタソケット１１１と、アジャスタギア７１と、アジャスタナット１１３と、アジャスタレバー７５（図６参照）と、を有する。アジャスタ１０９は、第１ブレーキシュー１７と第２ブレーキシュー１９とのシュー間隔を調整する。なお、アジャスタ１０９は、押圧機構９９の一部を構成している。 In the drum brake device 200 according to the second embodiment, 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.
　アジャスタギア７１は、回転によりアジャスタ１０９の全長を伸長してブレーキシュー間隔を一定にする。アジャスタギア７１は、一端がアジャスタナット１１３に螺合され、他端がアジャスタソケット１１１に嵌挿され、中間部に歯付輪７７が形成される。アジャスタレバー７５は、歯付輪７７に対向する爪部７９（図６参照）を有し、第１ブレーキシュー１７及び第２ブレーキシュー１９の拡開動作時にアジャスタピン８１を中心に図６の時計回り方向に回転することにより爪部７９が歯付輪７７に当接するように構成されている。 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.
　アジャスタ１０９によるシュー間隔自動調整動作では、上記のアジャスタ６７と同様に、ライニング２７の摩耗量が増えると、第１ブレーキシュー１７及び第２ブレーキシュー１９は規定行程以上移動し、それに伴ってアジャスタレバー７５の回動量が規定量を超えると、アジャスタ１０９が伸長することでシュー間隙の自動調整を行う。アジャスタ１０９は、全長寸法が長くなることにより、非制動時の第１ブレーキシュー１７及び第２ブレーキシュー１９の待機位置を離間し、シュー間隙（両側のシュー間隙の合計寸法）を略一定に維持する。 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.
　アジャスタソケット１１１は、アジャスタギア７１が嵌挿されるギア嵌合孔８３の反対側が、第２ウエブ２５に係合するウエブ係合爪１１５となる。アジャスタナット１１３は、アジャスタギア７１が螺合するギア螺合部８７の反対側が、支持部材１０３に一体に固定されている。支持部材１０３は、アジャスタナット１１３の反対側が、第１ウエブ２３に係合するウエブ係合爪１１７となる。 In the adjuster socket 111, 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. In the support member 103, the opposite side of the adjuster nut 113 is a web engagement claw 117 engaged with the first web 23.
　次に、上記した構成の作用を説明する。
　本第２の実施形態に係るドラムブレーキ装置２００では、第１ウエブ２３と第２ウエブ２５との間に押圧部材１０５が配置される。レバー１０１は、一方の第１ウエブ２３に当接する押圧機構９９の近傍部分（支持部材１０３）に、回転基部５１がレバーピン５９を介して回転自在に支持される。レバー１０１は、この回転基部５１の近傍にレバー押圧部１０７を有する。 Next, the operation of the above configuration will be described.
In the drum brake device 200 according to the second embodiment, 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.
　また、レバー入力部５３は、ブレーキ中心軸２９を挟んでこのレバー押圧部１０７の反対側に配置される。レバー１０１は、回転基部近傍のレバー押圧部１０７が一方の第１ウエブ２３に当接する。レバー入力部５３に外力が加えられて回転基部５１が回転されると、レバー押圧部１０７が一方の第１ウエブ２３を直接押圧し、第１ブレーキシュー１７と第２ブレーキシュー１９を拡開する。 Further, 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. In the lever 101, the lever pressing portion 107 in the vicinity of the rotation base abuts on one of the first webs 23. When an external force is applied to the lever input portion 53 and the rotary base 51 is rotated, 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. .
　ここで、レバー１０１は、レバー入力部５３が第２ウエブ２５とバッキングプレート１１の間に配置され、回転基部５１がブレーキ中心軸２９を挟んでレバー入力部５３の反対側に配置されている。これにより、レバー１０１は、他部材との干渉を回避しつつ大きく構成したものを高密度に（無駄なスペースを空けることなく）配置することができる。 Here, in the lever 101, 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. As a result, the lever 101 can be arranged at high density (without wasting space) while avoiding interference with other members.
［第３の実施形態］
　図１１及び図１２に示すように、本発明の第３の実施形態に係るドラムブレーキ装置３００は、パーキングブレーキ機構２０７及びオートアジャスタ（シュー間隙自動調整機構）２２１を除き、バッキングプレート１１、アンカ部３９、モータギアユニット１５、駆動部材４５、ホイールシリンダ４３、リターンスプリング３７及び引張コイルスプリング４１等が、上記第２の実施形態に係るドラムブレーキ装置２００とほぼ同様に構成されている。そのため、以下の説明では、主にパーキングブレーキ機構２０７及びオートアジャスタ２２１について詳述し、上記のドラムブレーキ装置２００と同等であるドラムブレーキ装置３００の他の構成についての説明は省略する。 Third Embodiment
As shown in FIGS. 11 and 12, the drum brake device 300 according to the third embodiment of the present invention 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.
　パーキングブレーキ機構２０７は、図１１に示すように、押圧拡開機構２０５と、モータギアユニット１５により駆動される駆動部材４５と、を有する。押圧拡開機構２０５は、押圧機構２０３（図１２参照）と、レバー２０１と、を有する。押圧機構２０３は、第１ウエブ２３及び第２ウエブ２５の一方端間に配置される。レバー２０１は、この押圧機構２０３を作動させて第１ブレーキシュー１７及び第２ブレーキシュー１９を拡開する。 As shown in FIG. 11, 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.
　より具体的には、本第３の実施形態の押圧機構２０３は、第１ウエブ２３と第２ウエブ２５との間に配置された押圧部材２０９を有する。レバー２０１は、押圧部材２０９における第１ブレーキシュー１７側の端部に、回転基部５１がレバーピン５９を介して回転自在に支持される。レバーピン５９は、頭部を有し、頭部と反対側の挿通先端が押圧部材２０９及び回転基部５１を貫通し、貫通先端に止め輪６１が装着されて脱落が規制される。 More specifically, 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.
　レバー２０１は、回転基部５１の近傍の外周に、図１２に示す突起状のレバー押圧部１０７を有する。このレバー押圧部１０７は、第１ブレーキシュー１７における第１ウエブ２３の内周端面に直接に当接する。レバー２０１は、レバー入力部５３がレバー押圧部１０７と反対側における第２ウエブ２５近傍に配置される。レバー２０１は、レバー入力部５３に外力が加えられて回転基部５１が回転されることで、レバー２０１のレバー押圧部１０７がレバー押圧部側における第１ウエブ２３を押圧して第１ブレーキシュー１７と第２ブレーキシュー１９を拡開する。 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. In the lever 201, 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.
　即ち、本第３の実施形態の押圧拡開機構２０５も、上記の第２の実施形態と同様、レバー２０１の回転基部５１が一方の第１ブレーキシュー１７近傍に配置され、この回転基部５１から延出するレバー入力部５３が、ブレーキ中心軸２９を挟んで他方の第２ブレーキシュー１９近傍に配置される。 That is, also in the pressing and spreading mechanism 205 of the third embodiment, 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.
　また、回転基部５１からバッキングプレート１１に対して平行に延出して第２ブレーキシュー１９近傍に配置されるレバー入力部５３は、第２ブレーキシュー１９側における第２ウエブ２５よりも内側に配置されている。そして、駆動部材４５のレバー挿入開口部６５が、第２ウエブ２５に対してバッキングプレート１１と反対側に配置されている。 Further, the 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.
　更に、本第３の実施形態に係るドラムブレーキ装置３００では、ホイールシリンダ４３の近傍における第１ブレーキシュー１７と第２ブレーキシュー１９との隣接端間に、シュー間隔を調整するオートアジャスタ２２１を介して押圧部材２０９が介装されている（図１２参照）。押圧部材２０９は、レバー２０１の回転に従動して第１ブレーキシュー１７の内側へ移動される。 Furthermore, in the drum brake device 300 according to the third embodiment, between the adjacent ends of the first brake shoe 17 and the second brake shoe 19 in the vicinity of the wheel cylinder 43, an automatic adjuster 221 for adjusting the shoe interval is provided. 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.
　オートアジャスタ２２１は、シュー間隙自動調整機構であり、非制動時における第１ブレーキシュー１７および第２ブレーキシュー１９の待機位置を規定している。オートアジャスタ２２１は、第２ブレーキシュー１９の第２ウエブ２５に固定されたガイドプレート２２５と、押圧部材２０９の一端部２０９ａとガイドプレート２２５との間に介装された楔形プレート２２３と、楔形プレート２２３を第２ブレーキシュー１９の他方の隣接端側に付勢する引張コイルスプリング２２７と、押圧部材２０９をガイドプレート２２５側に付勢する引張コイルスプリング２２９と、によって構成されている。 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.
　オートアジャスタ２２１は、摩擦材の摩耗に応じて第１ブレーキシュー１７および第２ブレーキシュー１９の待機位置を変更する。すなわち、摩擦材の摩耗により制動時の第１ブレーキシュー１７および第２ブレーキシュー１９の移動量が拡大すると、楔形プレート２２３を介して第２ブレーキシュー１９に固定されたガイドプレート２２５を押圧している押圧部材２０９の一端部２０９aとガイドプレート２２５との間隔が広がり、非制動時の第１ブレーキシュー１７および第２ブレーキシュー１９の待機位置が離間されて、シュー間隙（両側のシュー間隙の合計寸法）が略一定に維持される。 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.
　次に、上記した構成の作用を説明する。
　本第３の実施形態に係るドラムブレーキ装置３００では、押圧部材２０９における第１ブレーキシュー１７側の端部に回転自在に支持されたレバー２０１の回転基部５１が第１ブレーキシュー１７近傍に配置され、レバー入力部５３が、第２ブレーキシュー１９近傍に配置される。そこで、レバー自体を長くすることができ、回転基部５１からレバー入力部５３までの距離を長く取ることができるので、レバー比を大きく取ることができる。
　また、レバー入力部５３が、第２ブレーキシュー１９側における第２ウエブ２５よりも内側に配置され、駆動部材４５のレバー挿入開口部６５が、第２ウエブ２５に対してバッキングプレート１１と反対側に配置されている。そこで、レバー入力部５３はバッキングプレート１１との間に十分なクリアランスを確保することができ、レバー２０１のストローク量を増大させることができる。 Next, the operation of the above configuration will be described.
In the drum brake device 300 according to the third embodiment, 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.
Further, 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.
　従って、上記各実施形態に係るパーキングブレーキ機構３３，９５，２０７を有するドラムブレーキ装置１００，２００，３００によれば、一対の第１及び第２ブレーキシュー１７，１９を拡開するレバー４９，１０１，２０１のレバー比を大きく取ることができ、レバー４９，１０１，２０１を回転させる力を小さくできる。 Therefore, according to the drum brake device 100, 200, 300 having the parking brake mechanism 33, 95, 207 according to each of the above embodiments, 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.
　本発明は上記の実施形態に限定されるものではなく、実施形態の各構成を相互に組み合わせることや、明細書の記載、並びに周知の技術に基づいて、当業者が変更、応用することも本発明の予定するところであり、保護を求める範囲に含まれる。 The present invention is not limited to the above-described embodiments, but the configurations of the embodiments may be combined with one another, or modified or applied by those skilled in the art based on the description of the specification and the well-known techniques. It is intended for the invention, and is included in the scope for which protection is sought.
　例えば上記の構成例では、パーキングブレーキ機構をモータギアユニット１５で電動化する場合を説明したが、本発明の構成は、手動のパーキングブレーキ機構に適用されても上記と同様の効果を奏する。
　また、本出願は、２０１７年２月２３日出願の日本特許出願（特願２０１７－０３２２７９）に基づくものであり、その内容はここに参照として取り込まれる。 For example, although the case where the parking brake mechanism is motorized by the motor gear unit 15 has been described in the above configuration example, 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.
　ここで、上述した本発明に係るドラムブレーキ装置の実施の形態の特徴をそれぞれ以下に簡潔に纏めて列記する。
　［１］　ブレーキドラム（３０）の内周面に対向してバッキングプレート（１１）と平行な面上で拡開可能に配設される一対のブレーキシュー（第１ブレーキシュー１７及び第２ブレーキシュー１９）と、
　前記一対のブレーキシュー（第１ブレーキシュー１７及び第２ブレーキシュー１９）におけるウエブ（第１ウエブ２３及び第２ウエブ２５）の一方端間に配置された押圧機構（４７，９９，２０３）を作動させて前記一対のブレーキシュー（第１ブレーキシュー１７及び第２ブレーキシュー１９）を拡開するレバー（４９，１０１，２０１）を有する押圧拡開機構（３５，９７，２０５）と、を備え、
　前記レバー（４９，１０１，２０１）の回転基部（５１）が一方の前記ブレーキシュー（第１ブレーキシュー１７）近傍に配置され、前記回転基部（５１）から延出するレバー入力部（５３）が他方の前記ブレーキシュー（第２ブレーキシュー１９）近傍に配置されるパーキングブレーキ機構（３３，９５，２０７）を有するドラムブレーキ装置（１００，２００，３００）。
　［２］　上記［１］に記載のドラムブレーキ装置であって、
　前記レバー入力部（５３）が、前記回転基部（５１）とは反対側に位置する前記ウエブ（第２ウエブ２５）と前記バッキングプレート（１１）の間に配置されるドラムブレーキ装置（１００，２００）。
　［３］　上記［１］又は［２］に記載のドラムブレーキ装置であって、
　前記押圧拡開機構（３５）は、一対の前記ウエブ（第１ウエブ２３と第２ウエブ２５）間に配置された第１押圧部材（５５）及び第２押圧部材（５７）を有し、
　前記レバー（４９）は、前記第１押圧部材（５５）に前記回転基部（５１）が回転自在に支持されるとともに前記レバー入力部（５３）が前記第２押圧部材（５７）側における前記ウエブ（第２ウエブ２５）と前記バッキングプレート（１１）の間に配置され、前記レバー入力部（５３）に外力が加えられて前記回転基部（５１）が回転されることで、前記レバー（４９）のレバー押圧部（６３）が前記第２押圧部材（５７）を押圧して前記一対のブレーキシュー（第１ブレーキシュー１７と第２ブレーキシュー１９）を拡開するドラムブレーキ装置（１００）。
［４］　上記［１］又は［２］に記載のドラムブレーキ装置であって、
　前記押圧拡開機構（９７）は、一対の前記ウエブ（第１ウエブ２３と第２ウエブ２５）間に配置された押圧部材（１０５）及び前記レバー（１０１）のレバー押圧部（１０７）を有し、
　前記レバー（１０１）は、前記押圧部材（１０５）に前記回転基部（５１）が回転自在に支持されるとともに前記レバー入力部（５３）が前記レバー押圧部（１０７）と反対側における前記ウエブ（第２ウエブ２５）と前記バッキングプレート（１１）の間に配置され、前記レバー入力部（５３）に外力が加えられて前記回転基部（５１）が回転されることで、前記レバー押圧部（１０７）が前記レバー押圧部（１０７）側における前記ウエブ（第１ウエブ２３）を押圧して前記一対のブレーキシュー（第１ブレーキシュー１７及び第２ブレーキシュー１９）を拡開するドラムブレーキ装置（２００）。
［５］　上記［１］～［４］の何れか１つに記載のドラムブレーキ装置であって、
　前記押圧拡開機構（３５，９７）が、シュー間隔を自動調整するためのアジャスタ（６７，１０９）を有するドラムブレーキ装置（１００，２００）。
［６］　上記［１］～［５］の何れか１つに記載のドラムブレーキ装置であって、
　前記レバー入力部（５３）が、前記レバー入力部（５３）に外力を加える駆動部材（４５）に対し、駆動方向と交差する前記一対のブレーキシュー（第１ブレーキシュー１７及び第２ブレーキシュー１９）の拡開方向へ移動可能に連結されているドラムブレーキ装置（１００，２００，３００）。
［７］　上記［６］に記載のドラムブレーキ装置であって、
　前記駆動部材（４５）が、モータギアユニット（１５）により駆動されるドラムブレーキ装置（１００，２００，３００）。
［８］　上記［１］～［７］の何れか１つに記載のドラムブレーキ装置であって、
　前記レバー（４９，１０１，２０１）が、前記一対のブレーキシュー（第１ブレーキシュー１７及び第２ブレーキシュー１９）を拡開するためのホイールシリンダ（４３）と前記押圧機構（４７）との間に配置されているドラムブレーキ装置（１００，２００，３００）。 Here, the features of the embodiment of the drum brake device according to the present invention described above will be briefly summarized and listed below.
[1] 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, 207) disposed in the vicinity of the other brake shoe (second brake shoe 19).
[2] The drum brake device according to the above [1], wherein
The drum brake device (100, 200) wherein the lever input portion (53) is disposed between the web (second web 25) located on the opposite side to the rotary base (51) and the backing plate (11). ).
[3] The drum brake device according to the above [1] or [2], which
The pressing and spreading mechanism (35) has a first pressing member (55) and a second pressing member (57) arranged between the pair of the webs (the first web 23 and the second web 25).
In the lever (49), the rotary base (51) is rotatably supported by the first pressing member (55) and the lever input portion (53) is the web on the second pressing member (57) side. 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). A drum brake device (100) for expanding the pair of brake shoes (the first brake shoe 17 and the second brake shoe 19) by pressing the second pressing member (57) by the lever pressing portion (63).
[4] The drum brake device according to [1] or [2] above,
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). And
In 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 (200) for expanding the pair of brake shoes (first brake shoe 17 and second brake shoe 19) by pressing the web (first web 23) on the side of the lever pressing portion (107) ).
[5] The drum brake device according to any one of the above [1] to [4], which
A drum brake device (100, 200), wherein the pressure spreading mechanism (35, 97) has an adjuster (67, 109) for automatically adjusting a shoe interval.
[6] The drum brake device according to any one of [1] to [5] above,
The pair of brake shoes (the first brake shoe 17 and the second brake shoe 19 intersecting the drive direction with respect to the drive member (45) in which the lever input portion (53) applies an external force to the lever input portion (53). A drum brake device (100, 200, 300) movably connected in the expansion direction of
[7] The drum brake device according to the above [6], which
A drum brake device (100, 200, 300) in which the drive member (45) is driven by a motor gear unit (15).
[8] The drum brake device according to any one of the above [1] to [7], which
Between the wheel cylinder (43) and the pressing mechanism (47) for the lever (49, 101, 201) to expand the pair of brake shoes (the first brake shoe 17 and the second brake shoe 19) Drum brake devices (100, 200, 300) located in
　本発明のドラムブレーキ装置によれば、一対のブレーキシューを拡開するレバー比を大きく取ることができ、レバーを回転させる力を小さくできるドラムブレーキ装置を提供できる。 According to the 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.
１１…バッキングプレート
１５…モータギアユニット
１７…第１ブレーキシュー（一方のブレーキシュー）
１９…第２ブレーキシュー（他方のブレーキシュー）
２３…第１ウエブ（ウエブ）
２５…第２ウエブ（ウエブ）
２９…ブレーキ中心軸
３０…ブレーキドラム
３３…パーキングブレーキ機構
３５…押圧拡開機構
４３…ホイールシリンダ
４５…駆動部材
４７…押圧機構
４９…レバー
５１…回転基部
５３…レバー入力部
５５…第１押圧部材
５７…第２押圧部材
６３…レバー押圧部
６７…アジャスタ
１００…ドラムブレーキ装置 11 ... backing plate 15 ... motor gear unit 17 ... first brake shoe (one brake shoe)
19 ... 2nd brake shoe (the other brake shoe)
23 ... 1st web (web)
25 ... 2nd web (web)
Reference Signs List 29 brake central shaft 30 brake drum 33 parking brake mechanism 35 pressing and expanding mechanism 43 wheel cylinder 45 driving member 47 pressing mechanism 49 lever 51 rotation base 53 lever input portion 55 first pressing member 57 Second pressing member 63 Lever pressing portion 67 Adjuster 100 Drum brake device

Claims (8)

  1. 　ブレーキドラムの内周面に対向してバッキングプレートと平行な面上で拡開可能に配設される一対のブレーキシューと、
    　前記一対のブレーキシューにおけるウエブの一方端間に配置された押圧機構を作動させて前記一対のブレーキシューを拡開するレバーを有する押圧拡開機構と、を備え、
    　前記レバーの回転基部が一方の前記ブレーキシュー近傍に配置され、前記回転基部から延出するレバー入力部が他方の前記ブレーキシュー近傍に配置されるパーキングブレーキ機構を有するドラムブレーキ装置。     A pair of brake shoes disposed in an openable manner on a surface parallel to the backing plate opposite the inner peripheral surface of the brake drum;
    A pressing and opening mechanism having a lever for operating the pressing mechanism disposed between one end of the webs of the pair of brake shoes to widen the pair of brake shoes;
    A drum brake device having a parking brake mechanism, wherein a rotary base of the lever is disposed near one of the brake shoes, and a lever input portion extending from the rotary base is disposed near the other of the brake shoes.
  2. 　請求項１に記載のドラムブレーキ装置であって、
    　前記レバー入力部が、前記回転基部とは反対側に位置する前記ウエブと前記バッキングプレートの間に配置されるドラムブレーキ装置。     The drum brake device according to claim 1, wherein
    The drum brake device, wherein the lever input portion is disposed between the web opposite to the rotary base and the backing plate.
  3. 　請求項１又は２に記載のドラムブレーキ装置であって、
    　前記押圧拡開機構は、一対の前記ウエブ間に配置された第１押圧部材及び第２押圧部材を有し、
    　前記レバーは、前記第１押圧部材に前記回転基部が回転自在に支持されるとともに前記レバー入力部が前記第２押圧部材側における前記ウエブと前記バッキングプレートの間に配置され、前記レバー入力部に外力が加えられて前記回転基部が回転されることで、前記レバーのレバー押圧部が前記第２押圧部材を押圧して前記一対のブレーキシューを拡開するドラムブレーキ装置。     The drum brake device according to claim 1 or 2, wherein
    The press and spread mechanism includes a first press member and a second press member disposed between the pair of the webs.
    In the lever, 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.
  4. 　請求項１又は２に記載のドラムブレーキ装置であって、
    　前記押圧拡開機構は、一対の前記ウエブ間に配置された押圧部材及び前記レバーのレバー押圧部を有し、
    　前記レバーは、前記押圧部材に前記回転基部が回転自在に支持されるとともに前記レバー入力部が前記レバー押圧部と反対側における前記ウエブと前記バッキングプレートの間に配置され、前記レバー入力部に外力が加えられて前記回転基部が回転されることで、前記レバー押圧部が前記レバー押圧部側における前記ウエブを押圧して前記一対のブレーキシューを拡開するドラムブレーキ装置。     The drum brake device according to claim 1 or 2, wherein
    The press and spread mechanism includes a press member disposed between a pair of the webs and a lever press portion of the lever,
    The lever is rotatably supported on the rotary base by the pressing member and the lever input portion is disposed between the web and the backing plate on the side opposite to the lever pressing portion, and an external force is applied to the lever input portion. The drum brake device in which the lever pressing portion presses the web on the side of the lever pressing portion to expand the pair of brake shoes by the rotation base being rotated.
  5. 　請求項１～４の何れか１項に記載のドラムブレーキ装置であって、
    　前記押圧拡開機構が、シュー間隔を自動調整するためのアジャスタを有するドラムブレーキ装置。     The drum brake device according to any one of claims 1 to 4, wherein
    The drum brake device, wherein the pressure spreading mechanism has an adjuster for automatically adjusting a shoe interval.
  6. 　請求項１～５の何れか１項に記載のドラムブレーキ装置であって、
    　前記レバー入力部が、前記レバー入力部に外力を加える駆動部材に対し、駆動方向と交差する前記一対のブレーキシューの拡開方向へ移動可能に連結されているドラムブレーキ装置。     The drum brake device according to any one of claims 1 to 5, wherein
    The drum brake device, wherein the lever input portion is movably connected to a drive member that applies an external force to the lever input portion in a spreading direction of the pair of brake shoes intersecting the driving direction.
  7. 　請求項６に記載のドラムブレーキ装置であって、
    　前記駆動部材が、モータギアユニットにより駆動されるドラムブレーキ装置。     The drum brake device according to claim 6, wherein
    A drum brake device wherein the drive member is driven by a motor gear unit.
  8. 　請求項１～７の何れか１項に記載のドラムブレーキ装置であって、
    　前記レバーが、前記一対のブレーキシューを拡開するためのホイールシリンダと前記押圧機構との間に配置されているドラムブレーキ装置。     The drum brake device according to any one of claims 1 to 7, wherein
    The drum brake device, wherein the lever is disposed between a wheel cylinder for expanding the pair of brake shoes and the pressing mechanism.
PCT/JP2018/006820 2017-02-23 2018-02-23 Drum brake device WO2018155655A1 (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002242965A (en) * 2001-02-16 2002-08-28 Nissan Motor Co Ltd Shoe expanding device for drum brake and drum brake with shoe expanding device
JP2013124696A (en) * 2011-12-14 2013-06-24 Akebono Brake Ind Co Ltd Drum brake type electric parking brake device
JP2015152126A (en) * 2014-02-17 2015-08-24 曙ブレーキ工業株式会社 Parking brake mechanism and electric parking brake

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002242965A (en) * 2001-02-16 2002-08-28 Nissan Motor Co Ltd Shoe expanding device for drum brake and drum brake with shoe expanding device
JP2013124696A (en) * 2011-12-14 2013-06-24 Akebono Brake Ind Co Ltd Drum brake type electric parking brake device
JP2015152126A (en) * 2014-02-17 2015-08-24 曙ブレーキ工業株式会社 Parking brake mechanism and electric parking brake

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