WO2022071183A1 - Vehicle drum brake device - Google Patents

Vehicle drum brake device Download PDF

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Publication number
WO2022071183A1
WO2022071183A1 PCT/JP2021/035264 JP2021035264W WO2022071183A1 WO 2022071183 A1 WO2022071183 A1 WO 2022071183A1 JP 2021035264 W JP2021035264 W JP 2021035264W WO 2022071183 A1 WO2022071183 A1 WO 2022071183A1
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WO
WIPO (PCT)
Prior art keywords
brake
lever
drum
predetermined direction
camshaft
Prior art date
Application number
PCT/JP2021/035264
Other languages
French (fr)
Japanese (ja)
Inventor
悠帆 木村
Original Assignee
いすゞ自動車株式会社
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 いすゞ自動車株式会社 filed Critical いすゞ自動車株式会社
Publication of WO2022071183A1 publication Critical patent/WO2022071183A1/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
    • F16D65/00—Parts or details
    • F16D65/02—Braking members; Mounting thereof
    • F16D65/04—Bands, shoes or pads; Pivots or supporting members therefor
    • F16D65/08—Bands, shoes or pads; Pivots or supporting members therefor for internally-engaging brakes
    • F16D65/09—Pivots or supporting members therefor
    • 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
    • F16D2121/00—Type of actuator operation force
    • F16D2121/18—Electric or magnetic
    • F16D2121/24—Electric or magnetic using motors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2125/00—Components of actuators
    • F16D2125/18—Mechanical mechanisms
    • F16D2125/20—Mechanical mechanisms converting rotation to linear movement or vice versa
    • F16D2125/22—Mechanical mechanisms converting rotation to linear movement or vice versa acting transversely to the axis of rotation
    • F16D2125/24—Rack-and-pinion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2125/00—Components of actuators
    • F16D2125/18—Mechanical mechanisms
    • F16D2125/58—Mechanical mechanisms transmitting linear movement
    • F16D2125/64—Levers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2125/00—Components of actuators
    • F16D2125/18—Mechanical mechanisms
    • F16D2125/58—Mechanical mechanisms transmitting linear movement
    • F16D2125/66—Wedges
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2125/00—Components of actuators
    • F16D2125/18—Mechanical mechanisms
    • F16D2125/58—Mechanical mechanisms transmitting linear movement
    • F16D2125/70—Rods

Definitions

  • This disclosure relates to a vehicle drum brake device.
  • Patent Document 1 describes a drum brake used for a center brake, which is a brake exclusively for parking of a large vehicle such as a truck.
  • a center brake which is a brake exclusively for parking of a large vehicle such as a truck.
  • One end of the brake shoe of this drum brake is brought into contact with the side surface of the cam member fixed on the backing plate according to the urging force of the shoe return spring.
  • the cam member rotates around the axis of the shaft portion. Be made to.
  • the brake shoes are pressed against the inner peripheral surfaces of the rotating drum to perform braking.
  • the drum can rotate about a rotation axis extending in the front-rear direction, and the lever rotates in the circumferential direction of the drum, so that the brake cable crosses the predetermined direction. Connect to the lever while extending in the direction (for example, the vehicle width direction).
  • the brake actuator for operating the brake cable at a position separated from the lever in the front-rear direction (the direction in which the rotation axis of the drum extends, hereinafter referred to as "drum axis direction").
  • an object of the present disclosure is to provide a drum brake device for a vehicle capable of suppressing a decrease in pulling force due to a brake cable even when the brake actuator is arranged at a position separated from the lever in the drum axis direction.
  • the first aspect of the present disclosure is a drum that can rotate about a rotation axis extending in a predetermined direction, a pair of brake shoes provided inside the radial direction of the drum, and a brake shoe.
  • It is a vehicle drum brake device including an expansion mechanism, a lever, a brake cable, and a brake actuator.
  • the brake shoe expanding mechanism includes a camshaft that extends in the predetermined direction and can move in the predetermined direction, a wedge cam that is integrally provided on the camshaft, and a wedge cam that moves to one side in the predetermined direction.
  • the lever has a piston that is pressed in a direction intersecting the direction to expand a pair of brake shoes toward the inner peripheral surface of the drum, and is arranged between the pair of brake shoes.
  • the lever has a base end portion arranged on the camshaft side of the brake shoe expanding mechanism and a tip portion arranged outside the base end portion in the radial direction of the drum, and at least the tip portion has the above-mentioned predetermined direction. It is possible to move to.
  • the brake cable is connected to the lever and extends in the predetermined direction.
  • the brake actuator can move the tip of the lever in the predetermined direction by pulling the brake cable in the predetermined direction.
  • the lever and the camshaft of the brake shoe expanding mechanism are connected so that the camshaft moves to the one side in the predetermined direction by the movement of the tip of the lever in the predetermined direction.
  • the drum can rotate about a rotation axis extending in a predetermined direction, at least the tip of the lever can move in the predetermined direction, and the lever and the camshaft of the brake shoe expanding mechanism are separated from each other.
  • the camshaft is connected so as to move to one side in the predetermined direction by the movement of the tip end side of the lever in the predetermined direction.
  • the brake cable is connected to the lever and extends in the predetermined direction. In this way, the brake cable extends in the predetermined direction, and the lever for moving the camshaft can move in the predetermined direction. Therefore, the brake actuator is placed at a position separated from the lever in the predetermined direction (drum axis direction). Even when arranged, the number and angle of bending of the brake cable can be suppressed, and the decrease in pulling force due to the brake cable can be suppressed.
  • the second aspect of the present disclosure is the vehicle drum brake device of the first aspect, wherein the lever has a cable connection portion to which a brake cable is connected, and the cable connection portion and the brake actuator are described above. It is a drum brake device of a vehicle arranged in the same direction from the rotation axis of the drum when viewed from a predetermined direction.
  • the cable connection portion and the brake actuator are arranged in the same direction from the rotation axis of the drum when viewed from the predetermined direction, so that the brake cable between the brake actuator and the cable connection portion of the lever is used.
  • the brake actuator is arranged at a position separated from the lever in the drum axis direction, it is possible to suppress a decrease in the pulling force due to the brake cable.
  • FIG. 1 is a schematic plan view of a vehicle having a drum brake device according to an embodiment of the present disclosure.
  • FIG. 2 is a cross-sectional view taken along the line II-II of FIG.
  • FIG. 3 is a cross-sectional view taken along the line III-III of FIG.
  • FIG. 4 is a schematic view of FIG. 1 as viewed from the direction of arrow IV.
  • FIG. 5 is an explanatory diagram showing a connection state between the lever and the wedge rod.
  • FIG. 6 is an explanatory diagram corresponding to FIG. 5, and shows another modification of the connection state between the lever and the wedge rod.
  • FR indicates the front of the vehicle
  • UP indicates the upper side
  • IN indicates the inside in the vehicle width direction.
  • the front-rear direction means the front-rear direction of the vehicle
  • the left-right direction means the left-right direction in a state of facing the front of the vehicle.
  • the drum brake device 10 As shown in FIGS. 1 and 2, the drum brake device 10 according to the present embodiment is applied to, for example, a center brake which is a parking brake of a vehicle 1, and a propeller shaft extending in the front-rear direction behind the transmission 2 and the transmission 2. It is provided at the connecting portion with 3.
  • the drum brake device 10 includes a drum 4 that can rotate around a rotation axis CL (axis center CL) extending in the front-rear direction, and a pair of brake shoes 5 provided inside the drum 4 in the radial direction. In this embodiment, the drum 4 can rotate together with the propeller shaft 3.
  • the drum brake device 10 brakes the rotation of the drum 4 by pressing a pair of brake shoes 5 against the inner peripheral surface 4a of the drum 4.
  • the pair of brake shoes 5 are arranged inside the drum 4 in the radial direction (direction orthogonal to the rotation axis CL), and are supported by the backing plate 6 so as to be expandable toward the inner peripheral surface 4a of the drum 4.
  • the pair of brake shoes 5 are formed in an arc shape, one end side thereof (lower end side in the present embodiment) is rotatably supported by the backing plate 6, and the other end side (in the present embodiment). , Upper end side) can be tilted in the vehicle width direction.
  • the front-back direction is an example of a predetermined direction.
  • the drum brake device 10 includes a brake shoe expanding mechanism 11 capable of expanding a pair of brake shoes 5, a lever 12 for operating the brake shoe expanding mechanism 11. It includes an intermediate gear 13 provided between the lever 12 and the brake shoe expanding mechanism 11, a brake cable 14 connected to the lever 12, and a brake actuator 15 capable of pulling the brake cable 14.
  • the brake shoe expanding mechanism 11 is a mechanism for expanding a pair of brake shoes 5, and the ends of the pair of brake shoes 5 on the other end side of each other. It is arranged between the two and is supported on the upper part of the backing plate 6.
  • the brake shoe expanding mechanism 11 is arranged on both sides of the cylinder member 16 in the cylinder member 16 in the vehicle width direction and slides on the cylinder member 16 extending in the direction intersecting the front-rear direction (in the present embodiment, the vehicle width direction). It has a pair of freely supported pistons 17, a wedge cam 18 arranged between the pair of pistons 17, and a camshaft 19 extending forward from the wedge cam 18.
  • the vehicle width direction is an example of a direction that intersects with a predetermined direction.
  • the surfaces 17a on the opposite sides of the pair of pistons 17 are inclined with respect to the surface orthogonal to the vehicle width direction so as to be closer to each other from the front to the rear.
  • the outer side of the pair of pistons 17 in the vehicle width direction is connected to the other end side of the pair of brake shoes 5 via the shaft 23.
  • the wedge cam 18 is a wedge-shaped cam that is integrally provided at the rear end of the camshaft 19 and can move a pair of pistons 17 outward in the vehicle width direction by moving backward. It is possible.
  • the rear is one side in the predetermined direction. Note that FIG. 3 shows a state in which the pair of pistons 17 are not moved outward in the vehicle width direction.
  • the camshaft 19 extends forward from the wedge cam 18 and is supported by the cylinder member 16 so as to be slidable in the front-rear direction.
  • a rack gear 19a is formed on the upper surface side of the camshaft 19 (see FIG. 5).
  • the predetermined direction is not limited to the direction parallel to the rotation axis CL of the drum 4, but also includes the direction inclined with respect to the rotation axis CL.
  • the intermediate gear 13 is a gear that is arranged above the rack gear 19a of the camshaft 19 of the brake shoe expanding mechanism 11 and can be engaged with the rack gear 19a from above.
  • the intermediate gear 13 is rotatably supported on the backing plate 6 side about a shaft extending in the vehicle width direction.
  • the lever 12 is arranged above the camshaft 19 of the brake shoe expanding mechanism 11 and extends in the vertical direction.
  • the lever 12 extends straight up from the camshaft 19 side along the radial direction of the drum 4 when viewed from the front-rear direction.
  • the lower end portion 20 of the lever 12 is rotatably supported on the backing plate 6 side about an axis extending in the vehicle width direction.
  • a gear 21 that engages with the intermediate gear 13 from above is fixed to the lower end portion 20 of the lever 12. That is, the lever 12 and the camshaft 19 of the brake shoe expanding mechanism 11 are connected so that the camshaft 19 moves rearward by the rearward movement of the upper end portion 22 of the lever 12.
  • the lever 12 and the camshaft 19 are connected via the intermediate gear 13.
  • the lower end portion 20 of the lever 12 is an example of the base end portion of the lever
  • the upper end portion 22 of the lever 12 is an example of the tip end portion of the lever and the cable connection portion of the lever.
  • the upper end portion 22 of the lever 12 is arranged above the drum 4 and the backing plate 6 and is located directly above the rotation axis CL of the drum 4 (see FIGS. 1 and 2).
  • the upper end portion 22 of the lever 12 can be tilted in the front-rear direction with the lower end portion 20 as an axis.
  • the lever 12 is located between a normal position where the upper end portion 22 is located in the front (position shown in FIG.
  • the brake cable 14 is connected to the lever 12 and extends in the front-rear direction. In this embodiment, the brake cable 14 is connected to the upper end portion 22 of the lever 12.
  • the brake actuator 15 is arranged at a position separated rearward (one side in a predetermined direction) from the lever 12.
  • the brake actuator 15 is arranged behind the lever 12 and directly above the rotation axis CL of the drum 4. That is, the upper end portion (cable connection portion) 22 of the lever 12 and the brake actuator 15 are arranged in the same direction (directly above in this embodiment) from the rotation axis CL of the drum 4 when viewed from the front-rear direction. (See FIGS. 1 and 2).
  • the brake actuator 15 is fixed to the vehicle body side in a state where the brake cable 14 extends forward.
  • the brake actuator 15 when the parking brake is used, the brake actuator 15 is electrically or mechanically operated, the brake cable 14 is pulled backward, and the lever 12 is moved backward. Tilt it to move it from the normal position to the used position.
  • the force from the lever 12 is transmitted to the camshaft 19 via the intermediate gear 13, and the camshaft 19 slides backward.
  • the camshaft 19 slides backward, the wedge cam 18 moves the pair of pistons 17 outward in the vehicle width direction, and the pair of pistons 17 moves the pair of brake shoes 5 to the inner peripheral surface 4a of the drum 4. Expand toward.
  • the pair of brake shoes 5 is pressed against the inner peripheral surface 4a of the drum 4, the rotation of the drum 4 is restricted, and the rotation of the propeller shaft 3 is restricted.
  • the upper end portion 22 of the lever 12 can be tilted in the front-rear direction, and the lever 12 and the camshaft 19 of the brake shoe expanding mechanism 11 are such that the camshaft 19 moves rearward due to the movement of the lever 12 rearward.
  • the brake cable 14 is connected to the lever 12 and extends in the front-rear direction. In this way, the brake cable 14 extends in the front-rear direction, and the lever 12 for moving the camshaft 19 can move in the front-rear direction.
  • the brake actuator 15 is arranged at a position separated from the lever 12 in the front-rear direction (rearward in the present embodiment), the brake cable 14 with respect to the lever tilting in the vehicle width direction (including the circumferential direction of the drum 4).
  • the number and angle of bending of the brake cable 14 can be suppressed as compared with the case of connecting the brake cable 14, and the decrease in the attractive force due to the brake cable 14 can be suppressed.
  • the upper end portion (cable connection portion) 22 of the lever 12 and the brake actuator 15 are arranged in the same direction (directly above in this embodiment) from the rotation axis CL of the drum 4 in a state of being viewed from the front-rear direction. Therefore, the brake cable 14 between the brake actuator 15 and the upper end portion 22 of the lever 12 can be extended linearly in the front-rear direction. Therefore, even when the brake actuator 15 is arranged at a position separated from the lever 12 in the front-rear direction, the number and angle of bending of the brake cable 14 can be suppressed, and the decrease in the pulling force due to the brake cable 14 can be suppressed. ..
  • the lever 12 is extended straight upward along the radial direction of the drum 4 when viewed from the front-rear direction, but the present invention is not limited to this, and the radial direction of the drum 4 is not limited to this. It may be extended along the line in a direction other than directly above.
  • the lever 12 may be provided so as to be inclined with respect to the direction directly upward from the rotation axis CL of the drum 4.
  • the arrangement position of other members including the brake shoe expanding mechanism 11 and the pair of brake shoes 5) may be arranged according to the lever 12.
  • the brake cable 14 is connected to the upper end portion 22 of the lever 12, but a cable connection portion for connecting the brake cable 14 may be provided between the upper end portion 22 and the lower end portion 20 of the lever 12. ..
  • the cable connection portion of the lever 12 (in the present embodiment, the upper end portion 22) is arranged directly above the rotation axis CL of the drum 4, but the present invention is not limited to this.
  • the cable connection portion of the lever 12 may be arranged in a direction other than directly above the rotation axis CL of the drum 4 while viewed from the front-rear direction.
  • the cable connection portion of the lever 12 (the upper end portion 22 in the present embodiment) and the brake actuator 15 are viewed from the front-rear direction in the same direction from the rotation axis CL of the drum 4 (this). In the embodiment, they are arranged directly above), but the present invention is not limited to this, and they may be arranged in different directions from each other.
  • the brake actuator 15 is provided behind the lever 12 and the lever 12 is moved rearward (tilting in the present embodiment) to operate the brake (parking brake in the present embodiment).
  • the brake may be operated by providing the brake actuator 15 in front of the lever 12 and moving the lever 12 forward.
  • the brake is operated by sliding the camshaft 19 of the brake shoe expanding mechanism 11 backward, but the present invention is not limited to this, and the camshaft 19 is slid forward.
  • the brake may be operated by moving the brake.
  • an intermediate gear 13 is provided between the lever 12 and the camshaft 19 of the brake shoe expanding mechanism 11, whereby the camshaft slides backward due to the backward tilt of the lever 12.
  • the connection between the lever 12 and the camshaft 19 is not limited to the connection via the intermediate gear 13.
  • the lower end 20 of the lever 12 may be directly fixed to the camshaft 19, so that the camshaft slides backward due to the rearward movement of the lever 12.
  • the lever 12 and the camshaft 19 may be connected. That is, the lever 12 may be entirely movable in the front-rear direction (predetermined direction).
  • the drum brake device 10 according to the present disclosure is applied to the center brake of the vehicle 1, but the present invention is not limited to this.
  • the vehicle drum brake device according to the present disclosure can be widely applied to various vehicles.
  • Drum 5 1 pair of brake shoes 10: Drum brake device 11: Brake shoe expansion mechanism 12: Lever 14: Brake cable 15: Brake actuator 17: Piston 18: Wedge cam 19: Camshaft 20: Lever Lower end (base end) 22: Upper end of lever (tip, cable connection)

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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

In the present invention, a brake shoe expansion mechanism includes: a cylinder member 16 extending in a vehicle width direction; a pair of pistons disposed in the cylinder member 16 and slidably supported by the cylinder member 16; a wedge cam 18 disposed between the pair of pistons; and a camshaft 19 extending forward from the wedge cam 18. A lever 12 extends straight up from the camshaft 19 side along the radial direction of a drum. A lower-end section 20 of the lever 12 is rotatably supported on a backing plate 6 side. The lever 12 and the camshaft 19 are linked via an intermediate gear 13 so that the camshaft 19 moves rearward due to the rearward movement of an upper-end section 22 of the lever 12.

Description

車両のドラムブレーキ装置Vehicle drum brake device
　本開示は、車両のドラムブレーキ装置に関する。 This disclosure relates to a vehicle drum brake device.
　特許文献１には、トラック等の大型車両の駐車専用ブレーキであるセンターブレーキに用いられるドラムブレーキが記載されている。このドラムブレーキのブレーキシューの一端部は、シューリターンスプリングの付勢力に従って、バッキングプレート上に固定されたカム部材の側面にそれぞれ当接させられるようになっている。ドラムブレーキは、レバーのカム部材とは反対側に位置する端部に連結されたブレーキケーブルが引張られることにより、レバーが回動させられると、カム部材がその軸部の軸心回りにおいて回動させられる。これにより、ブレーキシューが回転ドラムの内周面にそれぞれ押し付けられて制動が行われる。 Patent Document 1 describes a drum brake used for a center brake, which is a brake exclusively for parking of a large vehicle such as a truck. One end of the brake shoe of this drum brake is brought into contact with the side surface of the cam member fixed on the backing plate according to the urging force of the shoe return spring. In the drum brake, when the lever is rotated by pulling the brake cable connected to the end located on the opposite side of the lever cam member, the cam member rotates around the axis of the shaft portion. Be made to. As a result, the brake shoes are pressed against the inner peripheral surfaces of the rotating drum to perform braking.
日本国特開２００６－３２７２６８号公報Japanese Patent Application Laid-Open No. 2006-327268
　特許文献１に記載のドラムブレーキでは、ドラムが、前後方向に延びる回転軸を中心として回転可能であり、レバーが、ドラムの周方向に回動するので、ブレーキケーブルを、上記所定方向と交叉する方向（例えば、車幅方向）に延びる状態でレバーに対して接続する。ところで、車両によっては、ブレーキケーブルを作動するためのブレーキアクチュエータをレバーから前後方向（ドラムの回転軸が延びる方向。以下、「ドラム軸方向」という。）に離間した位置に配置したい場合がある。しかし、ブレーキアクチュエータをレバーからドラム軸方向に離間した位置に配置すると、ブレーキアクチュエータからレバーまでのブレーキケーブルに曲げ部分が発生する可能性があり、ケーブル効率が低下してブレーキケーブルによる引き力が低下してしまうおそれがある。 In the drum brake described in Patent Document 1, the drum can rotate about a rotation axis extending in the front-rear direction, and the lever rotates in the circumferential direction of the drum, so that the brake cable crosses the predetermined direction. Connect to the lever while extending in the direction (for example, the vehicle width direction). By the way, depending on the vehicle, it may be desired to arrange the brake actuator for operating the brake cable at a position separated from the lever in the front-rear direction (the direction in which the rotation axis of the drum extends, hereinafter referred to as "drum axis direction"). However, if the brake actuator is placed at a position separated from the lever in the direction of the drum axis, a bent portion may occur in the brake cable from the brake actuator to the lever, which reduces the cable efficiency and the pulling force of the brake cable. There is a risk of doing so.
　そこで、本開示は、ブレーキアクチュエータをレバーからドラム軸方向に離間した位置に配置したときでも、ブレーキケーブルによる引き力の低下を抑えることが可能な車両のドラムブレーキ装置の提供を目的とする。 Therefore, an object of the present disclosure is to provide a drum brake device for a vehicle capable of suppressing a decrease in pulling force due to a brake cable even when the brake actuator is arranged at a position separated from the lever in the drum axis direction.
　上記課題を解決するため、本開示の第１の態様は、所定方向に延びる回転軸を中心として回転可能なドラムと、ドラムの径方向の内側に設けられた１対のブレーキシューと、ブレーキシュー拡開機構と、レバーと、ブレーキケーブルと、ブレーキアクチュエータとを備える車両のドラムブレーキ装置である。ブレーキシュー拡開機構は、上記所定方向に延びて上記所定方向に移動可能なカムシャフトと、カムシャフトに一体的に設けられるウェッジカムと、上記所定方向の一側へ移動するウェッジカムによって上記所定方向と交叉する方向へ押圧されて１対のブレーキシューをドラムの内周面へ向かって拡開させるピストンとを有し、１対のブレーキシューの間に配置される。レバーは、ブレーキシュー拡開機構のカムシャフト側に配置される基端部と、基端部よりもドラムの径方向の外側に配置される先端部とを有し、少なくとも先端部が上記所定方向に移動可能である。ブレーキケーブルは、レバーに接続されて上記所定方向に延びる。ブレーキアクチュエータは、ブレーキケーブルを上記所定方向へ引くことによってレバーの先端部を上記所定方向に移動させることが可能である。レバーとブレーキシュー拡開機構のカムシャフトとは、上記所定方向へのレバーの先端部の移動によってカムシャフトが上記所定方向の上記一側へ移動するように連結される。 In order to solve the above problems, the first aspect of the present disclosure is a drum that can rotate about a rotation axis extending in a predetermined direction, a pair of brake shoes provided inside the radial direction of the drum, and a brake shoe. It is a vehicle drum brake device including an expansion mechanism, a lever, a brake cable, and a brake actuator. The brake shoe expanding mechanism includes a camshaft that extends in the predetermined direction and can move in the predetermined direction, a wedge cam that is integrally provided on the camshaft, and a wedge cam that moves to one side in the predetermined direction. It has a piston that is pressed in a direction intersecting the direction to expand a pair of brake shoes toward the inner peripheral surface of the drum, and is arranged between the pair of brake shoes. The lever has a base end portion arranged on the camshaft side of the brake shoe expanding mechanism and a tip portion arranged outside the base end portion in the radial direction of the drum, and at least the tip portion has the above-mentioned predetermined direction. It is possible to move to. The brake cable is connected to the lever and extends in the predetermined direction. The brake actuator can move the tip of the lever in the predetermined direction by pulling the brake cable in the predetermined direction. The lever and the camshaft of the brake shoe expanding mechanism are connected so that the camshaft moves to the one side in the predetermined direction by the movement of the tip of the lever in the predetermined direction.
　上記構成では、ドラムが、所定方向に延びる回転軸を中心として回転可能であり、レバーの少なくとも先端部が、上記所定方向に移動可能であり、レバーとブレーキシュー拡開機構のカムシャフトとは、上記所定方向へのレバーの先端部側の移動によってカムシャフトが上記所定方向の一側へ移動するように連結される。また、ブレーキケーブルが、レバーに接続されて上記所定方向に延びる。このように、ブレーキケーブルが上記所定方向に延び、カムシャフトを移動させるためのレバーが上記所定方向に移動可能であるので、ブレーキアクチュエータをレバーから上記所定方向（ドラム軸方向）に離間した位置に配置したときでも、ブレーキケーブルの曲げの数や角度を抑えることができ、ブレーキケーブルによる引き力の低下を抑えることができる。 In the above configuration, the drum can rotate about a rotation axis extending in a predetermined direction, at least the tip of the lever can move in the predetermined direction, and the lever and the camshaft of the brake shoe expanding mechanism are separated from each other. The camshaft is connected so as to move to one side in the predetermined direction by the movement of the tip end side of the lever in the predetermined direction. Further, the brake cable is connected to the lever and extends in the predetermined direction. In this way, the brake cable extends in the predetermined direction, and the lever for moving the camshaft can move in the predetermined direction. Therefore, the brake actuator is placed at a position separated from the lever in the predetermined direction (drum axis direction). Even when arranged, the number and angle of bending of the brake cable can be suppressed, and the decrease in pulling force due to the brake cable can be suppressed.
　本開示の第２の態様は、上記第１の態様の車両のドラムブレーキ装置であって、レバーは、ブレーキケーブルが接続されるケーブル接続部を有し、ケーブル接続部とブレーキアクチュエータとは、上記所定方向から視た状態で、ドラムの回転軸から互いに同じ方向に配置される車両のドラムブレーキ装置である。 The second aspect of the present disclosure is the vehicle drum brake device of the first aspect, wherein the lever has a cable connection portion to which a brake cable is connected, and the cable connection portion and the brake actuator are described above. It is a drum brake device of a vehicle arranged in the same direction from the rotation axis of the drum when viewed from a predetermined direction.
　上記構成では、ケーブル接続部とブレーキアクチュエータとが、上記所定方向から視た状態で、ドラムの回転軸から互いに同じ方向に配置されるので、ブレーキアクチュエータとレバーのケーブル接続部との間のブレーキケーブルを上記所定方向に直線状に延ばすことができる。このため、ブレーキアクチュエータをレバーから上記所定方向（ドラム軸方向）に離間した位置に配置したときでも、ブレーキケーブルの曲げの数や角度を抑えることができ、ブレーキケーブルによる引き力の低下を抑えることができる。 In the above configuration, the cable connection portion and the brake actuator are arranged in the same direction from the rotation axis of the drum when viewed from the predetermined direction, so that the brake cable between the brake actuator and the cable connection portion of the lever is used. Can be linearly extended in the predetermined direction. Therefore, even when the brake actuator is placed at a position separated from the lever in the predetermined direction (drum axis direction), the number and angle of bending of the brake cable can be suppressed, and the decrease in the pulling force due to the brake cable can be suppressed. Can be done.
　本開示によれば、ブレーキアクチュエータをレバーからドラム軸方向に離間した位置に配置したときでも、ブレーキケーブルによる引き力の低下を抑えることができる。 According to the present disclosure, even when the brake actuator is arranged at a position separated from the lever in the drum axis direction, it is possible to suppress a decrease in the pulling force due to the brake cable.
図１は、本開示の一実施形態に係るドラムブレーキ装置を有する車両の概略平面図である。FIG. 1 is a schematic plan view of a vehicle having a drum brake device according to an embodiment of the present disclosure. 図２は、図１のII－II矢視断面図である。FIG. 2 is a cross-sectional view taken along the line II-II of FIG. 図３は、図２のIII－III矢視断面図である。FIG. 3 is a cross-sectional view taken along the line III-III of FIG. 図４は、図１を矢印IV方向から視た概略図である。FIG. 4 is a schematic view of FIG. 1 as viewed from the direction of arrow IV. 図５は、レバーとウェッジロッドとの接続状態を示す説明図である。FIG. 5 is an explanatory diagram showing a connection state between the lever and the wedge rod. 図６は、図５に対応する説明図であって、レバーとウェッジロッドとの接続状態の他の変形例を示す。FIG. 6 is an explanatory diagram corresponding to FIG. 5, and shows another modification of the connection state between the lever and the wedge rod.
　以下、本開示の一実施形態を図面に基づいて説明する。なお、各図において、ＦＲは車両の前方を、ＵＰは上方を、ＩＮは車幅方向内側をそれぞれ示す。また、以下の説明において、前後方向は車両の前後方向を意味し、左右方向は車両前方を向いた状態での左右方向を意味する。 Hereinafter, one embodiment of the present disclosure will be described with reference to the drawings. In each figure, FR indicates the front of the vehicle, UP indicates the upper side, and IN indicates the inside in the vehicle width direction. Further, in the following description, the front-rear direction means the front-rear direction of the vehicle, and the left-right direction means the left-right direction in a state of facing the front of the vehicle.
　図１及び図２に示すように、本実施形態に係るドラムブレーキ装置１０は、例えば、車両１のパーキングブレーキであるセンターブレーキに適用され、トランスミッション２とトランスミッション２の後方で前後方向に延びるプロペラシャフト３との連結部分に設けられる。ドラムブレーキ装置１０は、前後方向に延びる回転軸ＣＬ（軸心ＣＬ）を中心として回転可能なドラム４と、ドラム４の径方向の内側に設けられた１対のブレーキシュー５とを備える。本実施形態では、ドラム４はプロペラシャフト３と共に回転可能である。ドラムブレーキ装置１０は、ドラム４の内周面４ａに１対のブレーキシュー５を押し当てることによってドラム４の回転を制動する。１対のブレーキシュー５は、ドラム４の径方向（回転軸ＣＬと直交する方向）の内側に配置され、ドラム４の内周面４ａへ向かって拡開可能にバッキングプレート６に支持される。本実施形態では、１対のブレーキシュー５は、円弧状に形成され、その一端側（本実施形態では、下端側）がバッキングプレート６に回転可能に支持され、他端側（本実施形態では、上端側）が車幅方向に傾動可能となっている。ここで、前後方向は、所定方向の一例である、 As shown in FIGS. 1 and 2, the drum brake device 10 according to the present embodiment is applied to, for example, a center brake which is a parking brake of a vehicle 1, and a propeller shaft extending in the front-rear direction behind the transmission 2 and the transmission 2. It is provided at the connecting portion with 3. The drum brake device 10 includes a drum 4 that can rotate around a rotation axis CL (axis center CL) extending in the front-rear direction, and a pair of brake shoes 5 provided inside the drum 4 in the radial direction. In this embodiment, the drum 4 can rotate together with the propeller shaft 3. The drum brake device 10 brakes the rotation of the drum 4 by pressing a pair of brake shoes 5 against the inner peripheral surface 4a of the drum 4. The pair of brake shoes 5 are arranged inside the drum 4 in the radial direction (direction orthogonal to the rotation axis CL), and are supported by the backing plate 6 so as to be expandable toward the inner peripheral surface 4a of the drum 4. In the present embodiment, the pair of brake shoes 5 are formed in an arc shape, one end side thereof (lower end side in the present embodiment) is rotatably supported by the backing plate 6, and the other end side (in the present embodiment). , Upper end side) can be tilted in the vehicle width direction. Here, the front-back direction is an example of a predetermined direction.
　図１～図５に示すように、ドラムブレーキ装置１０は、１対のブレーキシュー５を拡開可能なブレーキシュー拡開機構１１と、ブレーキシュー拡開機構１１を操作するためのレバー１２と、レバー１２とブレーキシュー拡開機構１１との間に設けられる中間ギア１３と、レバー１２に接続されるブレーキケーブル１４と、ブレーキケーブル１４を引くことが可能なブレーキアクチュエータ１５とを備える。 As shown in FIGS. 1 to 5, the drum brake device 10 includes a brake shoe expanding mechanism 11 capable of expanding a pair of brake shoes 5, a lever 12 for operating the brake shoe expanding mechanism 11. It includes an intermediate gear 13 provided between the lever 12 and the brake shoe expanding mechanism 11, a brake cable 14 connected to the lever 12, and a brake actuator 15 capable of pulling the brake cable 14.
　図２及び図３に示すように、ブレーキシュー拡開機構１１は、１対のブレーキシュー５を拡開させるための機構であって、１対のブレーキシュー５の上記他端側の端部同士の間に配置され、バッキングプレート６の上部に支持される。ブレーキシュー拡開機構１１は、前後方向と交叉する方向（本実施形態では、車幅方向）へ延びるシリンダ部材１６と、シリンダ部材１６内の車幅方向両側に配置されてシリンダ部材１６に摺動自在に支持される１対のピストン１７と、１対のピストン１７間に配置されるウェッジカム１８と、ウェッジカム１８から前方へ延びるカムシャフト１９とを有する。ここで、車幅方向は、所定方向と交叉する方向の一例である。１対のピストン１７の互いに対向する側の面１７ａは、前方から後方へ向かうほど互いに近接するように、車幅方向と直交する面に対して傾斜している。１対のピストン１７の車幅方向外側は、軸２３を介して１対のブレーキシュー５の他端側に連結される。ウェッジカム１８は、くさび形に形成されたカムであって、カムシャフト１９の後端部に一体的に設けられ、後方への移動によって１対のピストン１７を車幅方向外側へ移動させることが可能である。ここで、後方は、上記所定方向の一側である。なお、図３には、１対のピストン１７を車幅方向外側へ移動させていない状態が図示されている。カムシャフト１９は、ウェッジカム１８から前方へ延び、前後方向にスライド移動自在にシリンダ部材１６に支持される。カムシャフト１９の上面側には、ラックギア１９ａが成形されている（図５参照）。なお、上記所定方向とは、ドラム４の回転軸ＣＬと平行な方向に限定されるものではなく、回転軸ＣＬに対して傾斜している方向も含む。 As shown in FIGS. 2 and 3, the brake shoe expanding mechanism 11 is a mechanism for expanding a pair of brake shoes 5, and the ends of the pair of brake shoes 5 on the other end side of each other. It is arranged between the two and is supported on the upper part of the backing plate 6. The brake shoe expanding mechanism 11 is arranged on both sides of the cylinder member 16 in the cylinder member 16 in the vehicle width direction and slides on the cylinder member 16 extending in the direction intersecting the front-rear direction (in the present embodiment, the vehicle width direction). It has a pair of freely supported pistons 17, a wedge cam 18 arranged between the pair of pistons 17, and a camshaft 19 extending forward from the wedge cam 18. Here, the vehicle width direction is an example of a direction that intersects with a predetermined direction. The surfaces 17a on the opposite sides of the pair of pistons 17 are inclined with respect to the surface orthogonal to the vehicle width direction so as to be closer to each other from the front to the rear. The outer side of the pair of pistons 17 in the vehicle width direction is connected to the other end side of the pair of brake shoes 5 via the shaft 23. The wedge cam 18 is a wedge-shaped cam that is integrally provided at the rear end of the camshaft 19 and can move a pair of pistons 17 outward in the vehicle width direction by moving backward. It is possible. Here, the rear is one side in the predetermined direction. Note that FIG. 3 shows a state in which the pair of pistons 17 are not moved outward in the vehicle width direction. The camshaft 19 extends forward from the wedge cam 18 and is supported by the cylinder member 16 so as to be slidable in the front-rear direction. A rack gear 19a is formed on the upper surface side of the camshaft 19 (see FIG. 5). The predetermined direction is not limited to the direction parallel to the rotation axis CL of the drum 4, but also includes the direction inclined with respect to the rotation axis CL.
　図５に示すように、中間ギア１３は、ブレーキシュー拡開機構１１のカムシャフト１９のラックギア１９ａの上方に配置されて、ラックギア１９ａに対して上方から係合可能なギアである。中間ギア１３は、車幅方向に延びる軸を中心としてバッキングプレート６側に回転可能に支持される。 As shown in FIG. 5, the intermediate gear 13 is a gear that is arranged above the rack gear 19a of the camshaft 19 of the brake shoe expanding mechanism 11 and can be engaged with the rack gear 19a from above. The intermediate gear 13 is rotatably supported on the backing plate 6 side about a shaft extending in the vehicle width direction.
　図４及び図５に示すように、レバー１２は、ブレーキシュー拡開機構１１のカムシャフト１９の上方に配置されて上下方向に延びる。本実施形態では、レバー１２は、前後方向から視た状態で、カムシャフト１９側からドラム４の径方向に沿って真上へ向かって延びる。レバー１２の下端部２０は、車幅方向に延びる軸を中心としてバッキングプレート６側に回転可能に支持される。レバー１２の下端部２０には、中間ギア１３に対して上方から係合するギア２１が固定される。すなわち、レバー１２とブレーキシュー拡開機構１１のカムシャフト１９とは、レバー１２の上端部２２の後方への移動によってカムシャフト１９が後方へ移動するように連結される。本実施形態では、レバー１２とカムシャフト１９とは、中間ギア１３を介して連結される。ここで、レバー１２の下端部２０はレバーの基端部の一例であり、レバー１２の上端部２２はレバーの先端部及びレバーのケーブル接続部の一例である。レバー１２の上端部２２は、ドラム４及びバッキングプレート６よりも上方に配置され、ドラム４の回転軸ＣＬの真上に位置する（図１及び図２参照）。レバー１２の上端部２２は、下端部２０を軸として前後方向に傾動可能である。本実施形態では、レバー１２は、上端部２２が前方に位置する通常位置（図４に図示する位置）と、上端部２２が後方に位置する使用位置（図５に図示する位置）との間を傾動可能である。すなわち、レバー１２は、少なくとも上端部（先端部）２２が前後方向（所定方向）に移動可能である。パーキングブレーキ非使用時には、レバー１２を通常位置に配置しておき、パーキングブレーキ使用時には、レバー１２を通常位置から使用位置に移動させる。 As shown in FIGS. 4 and 5, the lever 12 is arranged above the camshaft 19 of the brake shoe expanding mechanism 11 and extends in the vertical direction. In the present embodiment, the lever 12 extends straight up from the camshaft 19 side along the radial direction of the drum 4 when viewed from the front-rear direction. The lower end portion 20 of the lever 12 is rotatably supported on the backing plate 6 side about an axis extending in the vehicle width direction. A gear 21 that engages with the intermediate gear 13 from above is fixed to the lower end portion 20 of the lever 12. That is, the lever 12 and the camshaft 19 of the brake shoe expanding mechanism 11 are connected so that the camshaft 19 moves rearward by the rearward movement of the upper end portion 22 of the lever 12. In the present embodiment, the lever 12 and the camshaft 19 are connected via the intermediate gear 13. Here, the lower end portion 20 of the lever 12 is an example of the base end portion of the lever, and the upper end portion 22 of the lever 12 is an example of the tip end portion of the lever and the cable connection portion of the lever. The upper end portion 22 of the lever 12 is arranged above the drum 4 and the backing plate 6 and is located directly above the rotation axis CL of the drum 4 (see FIGS. 1 and 2). The upper end portion 22 of the lever 12 can be tilted in the front-rear direction with the lower end portion 20 as an axis. In the present embodiment, the lever 12 is located between a normal position where the upper end portion 22 is located in the front (position shown in FIG. 4) and a use position where the upper end portion 22 is located in the rear (position shown in FIG. 5). Can be tilted. That is, at least the upper end portion (tip portion) 22 of the lever 12 can move in the front-rear direction (predetermined direction). When the parking brake is not used, the lever 12 is arranged in the normal position, and when the parking brake is used, the lever 12 is moved from the normal position to the used position.
　ブレーキケーブル１４は、レバー１２に接続されて前後方向に延びる。本実施形態では、ブレーキケーブル１４は、レバー１２の上端部２２に接続される。 The brake cable 14 is connected to the lever 12 and extends in the front-rear direction. In this embodiment, the brake cable 14 is connected to the upper end portion 22 of the lever 12.
　図１に示すように、ブレーキアクチュエータ１５は、レバー１２よりも後方（所定方向の一側）へ離間した位置に配置される。本実施形態では、ブレーキアクチュエータ１５は、レバー１２よりも後方、且つドラム４の回転軸ＣＬの真上に配置される。すなわち、レバー１２の上端部（ケーブル接続部）２２とブレーキアクチュエータ１５とは、前後方向から視た状態で、ドラム４の回転軸ＣＬから互いに同じ方向（本実施形態では、真上）に配置される（図１及び図２参照）。ブレーキアクチュエータ１５は、ブレーキケーブル１４が前方へ向かって延びる状態で、車体側に固定される。 As shown in FIG. 1, the brake actuator 15 is arranged at a position separated rearward (one side in a predetermined direction) from the lever 12. In the present embodiment, the brake actuator 15 is arranged behind the lever 12 and directly above the rotation axis CL of the drum 4. That is, the upper end portion (cable connection portion) 22 of the lever 12 and the brake actuator 15 are arranged in the same direction (directly above in this embodiment) from the rotation axis CL of the drum 4 when viewed from the front-rear direction. (See FIGS. 1 and 2). The brake actuator 15 is fixed to the vehicle body side in a state where the brake cable 14 extends forward.
　上記のように構成されたドラムブレーキ装置１０では、パーキングブレーキを使用する際には、電気的または機械的にブレーキアクチュエータ１５を作動して、ブレーキケーブル１４を後方へ引いて、レバー１２を後方へ傾動させて通常位置から使用位置に移動させる。レバー１２を通常位置から使用位置へ移動させると、レバー１２からの力が中間ギア１３を介してカムシャフト１９へ伝達され、カムシャフト１９が後方へスライド移動する。カムシャフト１９が後方へスライド移動すると、ウェッジカム１８が１対のピストン１７を車幅方向外側へ移動させて、１対のピストン１７が１対のブレーキシュー５をドラム４の内周面４ａへ向かって拡開させる。これにより、１対のブレーキシュー５がドラム４の内周面４ａに押し付けられ、ドラム４の回転が規制され、プロペラシャフト３の回転が規制される。 In the drum brake device 10 configured as described above, when the parking brake is used, the brake actuator 15 is electrically or mechanically operated, the brake cable 14 is pulled backward, and the lever 12 is moved backward. Tilt it to move it from the normal position to the used position. When the lever 12 is moved from the normal position to the used position, the force from the lever 12 is transmitted to the camshaft 19 via the intermediate gear 13, and the camshaft 19 slides backward. When the camshaft 19 slides backward, the wedge cam 18 moves the pair of pistons 17 outward in the vehicle width direction, and the pair of pistons 17 moves the pair of brake shoes 5 to the inner peripheral surface 4a of the drum 4. Expand toward. As a result, the pair of brake shoes 5 is pressed against the inner peripheral surface 4a of the drum 4, the rotation of the drum 4 is restricted, and the rotation of the propeller shaft 3 is restricted.
　レバー１２の上端部２２が、前後方向に傾動可能であり、レバー１２とブレーキシュー拡開機構１１のカムシャフト１９とは、後方へのレバー１２の移動によってカムシャフト１９が後方へ移動するように、中間ギア１３を介して連結される。また、ブレーキケーブル１４が、レバー１２に接続されて前後方向に延びる。このように、ブレーキケーブル１４が前後方向に延び、カムシャフト１９を移動させるためのレバー１２が前後方向に移動可能である。したがって、ブレーキアクチュエータ１５をレバー１２から前後方向（本実施形態では後方）に離間した位置に配置したときでも、車幅方向（ドラム４の周方向を含む）に傾動するレバーに対してブレーキケーブル１４を接続する場合に比べてブレーキケーブル１４の曲げの数や角度を抑えることができ、ブレーキケーブル１４による引き力の低下を抑えることができる。 The upper end portion 22 of the lever 12 can be tilted in the front-rear direction, and the lever 12 and the camshaft 19 of the brake shoe expanding mechanism 11 are such that the camshaft 19 moves rearward due to the movement of the lever 12 rearward. , Connected via the intermediate gear 13. Further, the brake cable 14 is connected to the lever 12 and extends in the front-rear direction. In this way, the brake cable 14 extends in the front-rear direction, and the lever 12 for moving the camshaft 19 can move in the front-rear direction. Therefore, even when the brake actuator 15 is arranged at a position separated from the lever 12 in the front-rear direction (rearward in the present embodiment), the brake cable 14 with respect to the lever tilting in the vehicle width direction (including the circumferential direction of the drum 4). The number and angle of bending of the brake cable 14 can be suppressed as compared with the case of connecting the brake cable 14, and the decrease in the attractive force due to the brake cable 14 can be suppressed.
　また、レバー１２の上端部（ケーブル接続部）２２とブレーキアクチュエータ１５とは、前後方向から視た状態で、ドラム４の回転軸ＣＬから互いに同じ方向（本実施形態では、真上）に配置されるので、ブレーキアクチュエータ１５とレバー１２の上端部２２との間のブレーキケーブル１４を前後方向に直線状に延ばすことができる。このため、ブレーキアクチュエータ１５をレバー１２から前後方向に離間した位置に配置したときでも、ブレーキケーブル１４の曲げの数や角度を抑えることができ、ブレーキケーブル１４による引き力の低下を抑えることができる。 Further, the upper end portion (cable connection portion) 22 of the lever 12 and the brake actuator 15 are arranged in the same direction (directly above in this embodiment) from the rotation axis CL of the drum 4 in a state of being viewed from the front-rear direction. Therefore, the brake cable 14 between the brake actuator 15 and the upper end portion 22 of the lever 12 can be extended linearly in the front-rear direction. Therefore, even when the brake actuator 15 is arranged at a position separated from the lever 12 in the front-rear direction, the number and angle of bending of the brake cable 14 can be suppressed, and the decrease in the pulling force due to the brake cable 14 can be suppressed. ..
　従って、本実施形態によれば、ブレーキアクチュエータ１５をレバー１２から前後方向（ドラム軸方向）に離間した位置に配置したときでも、ブレーキケーブル１４による引き力の低下を抑えることができる。 Therefore, according to the present embodiment, even when the brake actuator 15 is arranged at a position separated from the lever 12 in the front-rear direction (drum axis direction), it is possible to suppress a decrease in the pulling force due to the brake cable 14.
　なお、本実施形態では、レバー１２を、前後方向から視た状態で、ドラム４の径方向に沿って真上へ向かって延ばしたが、これに限定されるものではなく、ドラム４の径方向に沿って真上以外の他の方向へ向かって延ばしてもよい。例えば、図２に二点鎖線で示すように、レバー１２を、ドラム４の回転軸ＣＬから真上に向かう方向に対して傾斜させて設けてもよい。この場合、他の部材（ブレーキシュー拡開機構１１及び１対のブレーキシュー５を含む）の配置位置もレバー１２に合わせて配置してもよい。 In the present embodiment, the lever 12 is extended straight upward along the radial direction of the drum 4 when viewed from the front-rear direction, but the present invention is not limited to this, and the radial direction of the drum 4 is not limited to this. It may be extended along the line in a direction other than directly above. For example, as shown by the alternate long and short dash line in FIG. 2, the lever 12 may be provided so as to be inclined with respect to the direction directly upward from the rotation axis CL of the drum 4. In this case, the arrangement position of other members (including the brake shoe expanding mechanism 11 and the pair of brake shoes 5) may be arranged according to the lever 12.
　また、本実施形態では、レバー１２の上端部２２にブレーキケーブル１４を接続したが、レバー１２の上端部２２と下端部２０との間にブレーキケーブル１４を接続するケーブル接続部を設けてもよい。 Further, in the present embodiment, the brake cable 14 is connected to the upper end portion 22 of the lever 12, but a cable connection portion for connecting the brake cable 14 may be provided between the upper end portion 22 and the lower end portion 20 of the lever 12. ..
　また、本実施形態では、レバー１２のケーブル接続部（本実施形態では、上端部２２）を、ドラム４の回転軸ＣＬの真上に配置したが、これに限定されるものではない。レバー１２のケーブル接続部を、前後方向から視た状態で、ドラム４の回転軸ＣＬから真上以外の他の方向に配置してもよい。 Further, in the present embodiment, the cable connection portion of the lever 12 (in the present embodiment, the upper end portion 22) is arranged directly above the rotation axis CL of the drum 4, but the present invention is not limited to this. The cable connection portion of the lever 12 may be arranged in a direction other than directly above the rotation axis CL of the drum 4 while viewed from the front-rear direction.
　また、本実施形態では、レバー１２のケーブル接続部（本実施形態では、上端部２２）とブレーキアクチュエータ１５とを、前後方向から視た状態で、ドラム４の回転軸ＣＬから互いに同じ方向（本実施形態では、真上）に配置したが、これに限定されるものではなく、互いに異なる方向に配置してもよい。 Further, in the present embodiment, the cable connection portion of the lever 12 (the upper end portion 22 in the present embodiment) and the brake actuator 15 are viewed from the front-rear direction in the same direction from the rotation axis CL of the drum 4 (this). In the embodiment, they are arranged directly above), but the present invention is not limited to this, and they may be arranged in different directions from each other.
　また、本実施形態では、ブレーキアクチュエータ１５をレバー１２よりも後方に設け、レバー１２を後方へ移動（本実施形態では、傾動）させることによって、ブレーキ（本実施形態では、パーキングブレーキ）を作動させたが、これに限定されるものではない。例えば、ブレーキアクチュエータ１５をレバー１２よりも前方に設け、レバー１２を前方へ移動させることによって、ブレーキを作動させてもよい。 Further, in the present embodiment, the brake actuator 15 is provided behind the lever 12 and the lever 12 is moved rearward (tilting in the present embodiment) to operate the brake (parking brake in the present embodiment). However, it is not limited to this. For example, the brake may be operated by providing the brake actuator 15 in front of the lever 12 and moving the lever 12 forward.
　また、本実施形態では、ブレーキシュー拡開機構１１のカムシャフト１９を後方へスライド移動させることによってブレーキを作動させる構成としたが、これに限定されるものではなく、カムシャフト１９を前方へスライド移動させることによってブレーキを作動させる構成としてもよい。 Further, in the present embodiment, the brake is operated by sliding the camshaft 19 of the brake shoe expanding mechanism 11 backward, but the present invention is not limited to this, and the camshaft 19 is slid forward. The brake may be operated by moving the brake.
　また、本実施形態では、レバー１２とブレーキシュー拡開機構１１のカムシャフト１９との間に中間ギア１３を設け、これにより、レバー１２の後方への傾動によってカムシャフトが後方へスライド移動するように、レバー１２とカムシャフト１９とを連結したが、レバー１２とカムシャフト１９との連結は中間ギア１３を介した連結に限定されるものではない。例えば、図６に示すように、レバー１２の下端部２０をカムシャフト１９に直接的に固定してもよく、これにより、レバー１２の後方への移動によってカムシャフトが後方へスライド移動するように、レバー１２とカムシャフト１９とを連結してもよい。すなわち、レバー１２は、その全体が前後方向（所定方向）に移動可能であってもよい。この場合、レバー１２は、前後方向に平行移動するので、レバー１２の移動中にレバー１２に対するブレーキケーブル１４の角度の変化を抑えることができ、ブレーキケーブル１４からレバー１２への力の変化を抑えることができる。なお、図６では、パーキングブレーキ非使用時のレバー１２等を二点鎖線で示し、パーキングブレーキ使用時のレバー１２等を実線で示している。 Further, in the present embodiment, an intermediate gear 13 is provided between the lever 12 and the camshaft 19 of the brake shoe expanding mechanism 11, whereby the camshaft slides backward due to the backward tilt of the lever 12. Although the lever 12 and the camshaft 19 are connected to each other, the connection between the lever 12 and the camshaft 19 is not limited to the connection via the intermediate gear 13. For example, as shown in FIG. 6, the lower end 20 of the lever 12 may be directly fixed to the camshaft 19, so that the camshaft slides backward due to the rearward movement of the lever 12. , The lever 12 and the camshaft 19 may be connected. That is, the lever 12 may be entirely movable in the front-rear direction (predetermined direction). In this case, since the lever 12 moves in parallel in the front-rear direction, the change in the angle of the brake cable 14 with respect to the lever 12 can be suppressed while the lever 12 is moving, and the change in the force from the brake cable 14 to the lever 12 can be suppressed. be able to. In FIG. 6, the lever 12 and the like when the parking brake is not used are shown by a two-dot chain line, and the lever 12 and the like when the parking brake is used are shown by a solid line.
　以上、本発明について、上記実施形態に基づいて説明を行ったが、本発明は上記実施形態の内容に限定されるものではなく、当然に本発明を逸脱しない範囲で適宜変更が可能である。すなわち、この実施形態に基づいて当業者等によりなされる他の実施形態、実施例および運用技術等は全て本発明の範疇に含まれることは勿論である。 Although the present invention has been described above based on the above embodiment, the present invention is not limited to the contents of the above embodiment, and can be appropriately modified without departing from the present invention. That is, it goes without saying that all other embodiments, examples, operational techniques, and the like made by those skilled in the art based on this embodiment are included in the scope of the present invention.
　例えば、上記実施形態では、本開示に係るドラムブレーキ装置１０を、車両１のセンターブレーキに適用したが、これに限定されるものではない。 For example, in the above embodiment, the drum brake device 10 according to the present disclosure is applied to the center brake of the vehicle 1, but the present invention is not limited to this.
　本出願は、2020年9月30日付で出願された日本国特許出願（特願2020-164744）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。 This application is based on a Japanese patent application filed on September 30, 2020 (Japanese Patent Application No. 2020-164744), the contents of which are incorporated herein by reference.
　本開示に係る車両のドラムブレーキ装置は、様々な車両に広く適用することができる。 The vehicle drum brake device according to the present disclosure can be widely applied to various vehicles.
１：車両
４：ドラム
５：１対のブレーキシュー
１０：ドラムブレーキ装置
１１：ブレーキシュー拡開機構
１２：レバー
１４：ブレーキケーブル
１５：ブレーキアクチュエータ
１７：ピストン
１８：ウェッジカム
１９：カムシャフト
２０：レバーの下端部（基端部）
２２：レバーの上端部（先端部、ケーブル接続部） 1: Vehicle 4: Drum 5: 1 pair of brake shoes 10: Drum brake device 11: Brake shoe expansion mechanism 12: Lever 14: Brake cable 15: Brake actuator 17: Piston 18: Wedge cam 19: Camshaft 20: Lever Lower end (base end)
22: Upper end of lever (tip, cable connection)

Claims (2)

  1. 　所定方向に延びる回転軸を中心として回転可能なドラムと、
    　前記ドラムの径方向の内側に設けられた１対のブレーキシューと、
    　前記所定方向に延びて前記所定方向に移動可能なカムシャフトと、前記カムシャフトに一体的に設けられるウェッジカムと、前記所定方向の一側へ移動する前記ウェッジカムによって前記所定方向と交叉する方向へ押圧されて前記１対のブレーキシューを前記ドラムの内周面へ向かって拡開させるピストンとを有し、前記１対のブレーキシューの間に配置されるブレーキシュー拡開機構と、
    　前記ブレーキシュー拡開機構の前記カムシャフト側に配置される基端部と、前記基端部よりも前記ドラムの径方向の外側に配置される先端部とを有し、少なくとも前記先端部が前記所定方向に移動可能なレバーと、
    　前記レバーに接続されて前記所定方向に延びるブレーキケーブルと、
    　前記ブレーキケーブルを前記所定方向へ引くことによって前記レバーの前記先端部を前記所定方向に移動させることが可能なブレーキアクチュエータと、を備える車両のドラムブレーキ装置であって、
    　前記レバーと前記ブレーキシュー拡開機構の前記カムシャフトとは、前記所定方向への前記レバーの前記先端部の移動によって前記カムシャフトが前記所定方向の前記一側へ移動するように連結される
    　車両のドラムブレーキ装置。     A drum that can rotate around a rotation axis that extends in a predetermined direction,
    A pair of brake shoes provided inside the drum in the radial direction, and
    A direction in which a camshaft extending in a predetermined direction and movable in the predetermined direction, a wedge cam integrally provided on the camshaft, and the wedge cam moving to one side in the predetermined direction intersect with the predetermined direction. A brake shoe expanding mechanism that has a piston that is pressed against and expands the pair of brake shoes toward the inner peripheral surface of the drum, and is arranged between the pair of brake shoes.
    The brake shoe expanding mechanism has a base end portion arranged on the camshaft side and a tip end portion arranged radially outside the drum from the base end portion, and at least the tip end portion is said. A lever that can move in a predetermined direction,
    A brake cable connected to the lever and extending in the predetermined direction,
    A vehicle drum brake device comprising a brake actuator capable of moving the tip of the lever in the predetermined direction by pulling the brake cable in the predetermined direction.
    The lever and the camshaft of the brake shoe expanding mechanism are connected to each other so that the camshaft moves to the one side in the predetermined direction by moving the tip of the lever in the predetermined direction. Drum brake device.
  2. 　請求項１に記載の車両のドラムブレーキ装置であって、
    　前記レバーは、前記ブレーキケーブルが接続されるケーブル接続部を有し、
    　前記ケーブル接続部と前記ブレーキアクチュエータとは、前記所定方向から視た状態で、前記ドラムの前記回転軸から互いに同じ方向に配置される
    　車両のドラムブレーキ装置。     The vehicle drum brake device according to claim 1.
    The lever has a cable connection to which the brake cable is connected.
    The cable connection portion and the brake actuator are vehicle drum brake devices arranged in the same direction from the rotation axis of the drum when viewed from the predetermined direction.
PCT/JP2021/035264 2020-09-30 2021-09-27 Vehicle drum brake device WO2022071183A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2020-164744 2020-09-30
JP2020164744A JP2022056801A (en) 2020-09-30 2020-09-30 Vehicle drum brake device

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000310264A (en) * 1999-04-28 2000-11-07 Araco Corp Brake mechanism
JP2009103176A (en) * 2007-10-22 2009-05-14 Toyota Motor Corp Parking braking system
JP2013024390A (en) * 2011-07-25 2013-02-04 Hosei Brake Ind Ltd Drum brake
JP2018021657A (en) * 2016-05-22 2018-02-08 株式会社ハイドロリックシステム開発 Drum brake device for vehicle and vehicle installed with the same

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000310264A (en) * 1999-04-28 2000-11-07 Araco Corp Brake mechanism
JP2009103176A (en) * 2007-10-22 2009-05-14 Toyota Motor Corp Parking braking system
JP2013024390A (en) * 2011-07-25 2013-02-04 Hosei Brake Ind Ltd Drum brake
JP2018021657A (en) * 2016-05-22 2018-02-08 株式会社ハイドロリックシステム開発 Drum brake device for vehicle and vehicle installed with the same

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