WO2014162355A1 - Frein à tambour - Google Patents

Frein à tambour Download PDF

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Publication number
WO2014162355A1
WO2014162355A1 PCT/JP2013/002304 JP2013002304W WO2014162355A1 WO 2014162355 A1 WO2014162355 A1 WO 2014162355A1 JP 2013002304 W JP2013002304 W JP 2013002304W WO 2014162355 A1 WO2014162355 A1 WO 2014162355A1
Authority
WO
WIPO (PCT)
Prior art keywords
brake
drum
pair
anchor
leaf spring
Prior art date
Application number
PCT/JP2013/002304
Other languages
English (en)
Japanese (ja)
Inventor
隼人 駒井
順也 田口
諭 柏村
Original Assignee
株式会社Tbk
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 株式会社Tbk filed Critical 株式会社Tbk
Priority to JP2015509598A priority Critical patent/JPWO2014162355A1/ja
Priority to PCT/JP2013/002304 priority patent/WO2014162355A1/fr
Priority to CN201380075226.1A priority patent/CN105102841A/zh
Publication of WO2014162355A1 publication Critical patent/WO2014162355A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • 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
    • 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
    • F16D2125/00—Components of actuators
    • F16D2125/18—Mechanical mechanisms
    • F16D2125/58—Mechanical mechanisms transmitting linear movement
    • F16D2125/66—Wedges

Definitions

  • the present invention relates to a drum brake that performs braking operation by using friction generated between the brake shoe having a friction material pressed against an inner peripheral surface of a brake drum that rotates together with a wheel.
  • the present invention relates to a drum brake in which one end is attached to an anchor member, and a brake shoe is rocked by swinging a brake shoe around the one end.
  • the drum brake configured as described above is called a leading trailing drum brake and is widely used as a vehicle brake.
  • this leading trailing drum brake there is a form in which one end of a brake shoe is slidably brought into contact with an anchor member, which is called a floating anchor type.
  • Patent Document 1 discloses a floating anchor type drum brake in which one end of a leading shoe 2 and a trailing shoe 3 is elastically brought into contact with an anchor 9 by an anchor spring 10.
  • FIG. 10 also shows a conventional floating anchor type drum brake 500. More specifically, FIG. 10A shows a front view (partially omitted) of the drum brake 500, and FIG. ) Shows bottom views of the drum brake 500, respectively.
  • the drum brake 500 has anchor springs 550 and 550 attached to the front and back sides of the brake shoes 540 and 540, respectively, and one end of the brake shoes 540 and 540 is slidably brought into contact with the anchor pins 526 and 526. It has a configuration to let you.
  • the brake shoes 540, 540 are swung around the anchor pins 526, 526 by the operation of a brake shoe rocking mechanism (not shown) that presses the other end of the brake shoes 540, 540, and the brake drum It is pressed against the inner peripheral surface.
  • the present invention has been made in view of the above problems, and an object of the present invention is to provide a drum brake that can be easily assembled without increasing the number of work steps while suppressing an increase in cost.
  • a drum brake according to the present invention includes a cylindrical brake drum that is connected to a rotating body to be braked and rotates, and a fixed member that is fixed and held (for example, the anchor bracket 2 in the embodiment).
  • a pair of left and right brake shoes that are supported and arranged to face each other along the cylindrical inner peripheral surface of the brake drum, and are attached to the fixing member, and the brake shoes are expanded in response to a brake operation, and the brake drum
  • a brake brake swinging mechanism (for example, the expander 5 in the embodiment) that presses against the inner peripheral surface of the drum brake. It has a contact portion (for example, a pressing surface 41b in the embodiment) that contacts the shoe swinging mechanism from both left and right sides.
  • Each other end has an engaging portion (for example, a sliding surface 41a in the embodiment) that engages with a pair of left and right anchor members (for example, the anchor pin 26 in the embodiment) provided on the fixing member.
  • the engaging portion engages with the anchor member, and the abutting portion abuts the brake shoe swinging mechanism from the left and right so that the pair of left and right brake shoes are along the inner peripheral surface of the brake drum.
  • the brake shoe swinging mechanism pushes the abutting portion away from each other, and swings and expands about the engaging portion engaging the pair of left and right brake shoes with the anchor member.
  • a leaf spring member (for example, a leaf spring 44 in the embodiment) that urges the other ends of the pair of left and right brake shoes in a direction approaching each other straddles the other ends of the pair of left and right brake shoes. It is characterized by being attached.
  • the leaf spring member is formed using an elastically deformable plate material, and is formed in a partial cylindrical shape that connects the other end sides of the pair of left and right brake shoes along the outer peripheral side, and both left and right ends.
  • a locking portion that is locked to the other end of the pair of left and right brake shoes, and the locking portion is in a state in which the leaf spring member is elastically deformed in a direction in which the locking portions are separated from each other.
  • the engagement portion is engaged with the other end side of the pair of left and right brake shoes and urges the other end sides of the pair of left and right brake shoes toward each other by an elastic force generated by the leaf spring member.
  • a configuration that holds the state engaged with the anchor member is preferable.
  • a central portion (for example, the first curved portion 45a in the embodiment) along the outer peripheral direction of the brake shoe is formed to be curved so as to be convex toward the central portion of the brake shoe. It is preferable that the width is formed to be narrower than the width of a portion (for example, the second curved portion 45b in the embodiment) connected from the central portion to the locking portion.
  • the anchor member is formed of a cylindrical member, and the engaging portion is formed of a semicircular recess having substantially the same diameter as the outer periphery of the anchor member.
  • the leaf spring member that urges the other ends of the pair of brake shoes in a direction approaching each other in a state in which the engagement portions of the brake shoes are engaged with the anchor members, respectively. It is configured to be mounted across the other end. For this reason, since the leaf spring member can be attached without reversing the brake shoe, the drum brake can be easily assembled without increasing the number of work steps. Moreover, since the number of parts can be reduced by replacing the two anchor springs in the conventional configuration with one leaf spring member, the manufacturing cost can be reduced and the parts can be easily managed.
  • the leaf spring member is attached to the pair of brake shoes in a state in which the locking portion is elastically deformed in a direction away from each other, and the engaging portion is engaged with the anchor member by the elastic force of the leaf spring member It is preferable to hold the If comprised in this way, the state which the engaging part engaged with the anchor member can be easily hold
  • the leaf spring member is formed to be curved so that the central portion thereof is convex toward the central portion of the brake shoe, and the width of the central portion is narrower than the width of the portion connecting from the central portion to the locking portion.
  • the leaf spring member is formed to be curved so that the central portion thereof is convex toward the central portion of the brake shoe, and the width of the central portion is narrower than the width of the portion connecting from the central portion to the locking portion.
  • FIG. 5 is a cross-sectional view showing a VV portion (expander) in FIG. 1.
  • FIG. 7 is a cross-sectional view (partial side view) showing a VII-VII portion in FIG. 6.
  • FIG. 7 is a cross-sectional view showing a VIII-VIII portion in FIG. 6. It is a figure which shows the modification of an anchor bracket and a brake shoe, Comprising: (a) shows a front view, (b) shows a bottom view, respectively. It is a figure which shows the structure of the conventional drum brake, Comprising: (a) is a front view (a part is abbreviate
  • FIG. 1 is a front view of a floating anchor type drum brake B1 to which the present invention is applied.
  • the entire configuration of the drum brake B1 will be described with reference to FIGS.
  • the following explanation will be given by defining left and right, up and down, and front and rear in the direction of the arrow attached to each figure.
  • the drum brake B ⁇ b> 1 includes an anchor bracket 2 that is fixed to the axle housing 8 of the vehicle body together with the dust cover 6, and a brake drum 31 that is rotatable on the axle 1 together with the axle 1.
  • a drum unit 3 and a brake shoe unit 4 having a pair of left and right brake shoes 40, 40 which are held by the anchor bracket 2 so as to be swingable to the left and right and are respectively disposed along the inner peripheral surface of the brake drum 31;
  • the expander 5 is configured to swing the brake shoes 40, 40 according to the brake operation and press the brake shoes 40 against the inner peripheral surface of the brake drum 31.
  • the drum unit 3 is indicated by a two-dot chain line, and the drum unit 3 is not shown in FIG.
  • the anchor bracket 2 has an axle insertion hole 21 formed at the center and a plurality of bolt insertion holes 22, 22,...
  • a brake shoe support portion 25 having a pair of left and right pin insertion holes 24, 24 penetrating in the front-rear direction in the vicinity of the lower end portion, and the front and rear ends inserted into the pin insertion holes 24, 24 from the brake shoe support portion 25
  • anchor pins 26 and 26 projecting from each other.
  • the anchor bracket 2 is fixed to the axle housing 8 together with the dust cover 6 by using bolts inserted into the respective bolt insertion holes 22.
  • Each anchor pin 26 may be inserted into each pin insertion hole 24 and fixed, or each anchor pin 26 may be inserted into each pin insertion hole 24 and pivoted.
  • the drum unit 3 is mounted on a wheel rim (not shown) on a wheel hub (not shown) rotatably mounted on an axle 1 protruding rearward from the axle insertion hole 21 of the anchor bracket 2 via a bearing (not shown). And the brake drum 31 is coupled. Note that a tire is attached to the wheel rim, and the brake drum 31 and the tire rotate together via a wheel hub.
  • the brake shoe unit 4 is fixed to an outer circumferential surface of the rim portion 42, a semi-disc-shaped web portion 41 extending vertically in an arc shape, a semi-cylindrical rim portion 42 attached to the left and right outer circumferential surfaces of the web portion 41.
  • a pair of brake shoes 40 including a lining 43 is provided.
  • the lining 43 is fixed to the rim portion 42 by caulking of rivets (not shown).
  • Each brake shoe 40 is disposed symmetrically along the inner peripheral surface of the brake drum 31, and the lining 43 is opposed to the inner peripheral surface of the brake drum 31.
  • Sliding surfaces 41a and 41a formed in an arc shape corresponding to the diameter of the anchor pin 26 are formed in a pair of front and rear at the lower end portion of each web portion 41 (see FIG. 2).
  • a pressing surface 41b pressed by the expander 5 is formed on the left and right inner sides.
  • the bottom surface (side surface) of each rim portion 42 is formed with a locking hole 42a to which a leaf spring 44 for slidably contacting each sliding surface 41a to the anchor pin 26 is attached. Has been.
  • FIG. 4 shows a leaf spring 44, which is formed by bending an elastically deformable metal plate.
  • the leaf spring 44 has a base portion 45 formed in a predetermined shape and a pair of left and right engaging portions 46, 46 connected to the left and right ends of the base portion 45. It is formed symmetrically.
  • the base portion 45 is connected to a first curved portion 45a formed to be convex upward and to the left and right ends of the first curved portion 45a. It is comprised from the 2nd bending parts 45b and 45b formed by making it curve so that it may become convex toward the downward direction.
  • Each locking portion 46 is connected to the left and right end portions of the second bending portion 45b and is bent so as to protrude outward in the left and right directions, and the third bending portion 46a. It is comprised from the 4th curved part 46b formed by curving so that it may connect with an upper end part and may become convex toward the left-right inward. As shown in FIG. 4C, since the chamfers 46c and 46c are formed at the front and rear ends of the fourth bending portion 46b, the locking portion 46 is inserted into the locking hole 42a formed in the rim portion 42 of the brake shoe 40. Is easier to insert. Further, as can be seen from FIG.
  • the first curved portion 45a is formed to have a narrower front-rear width than the second curved portions 45b, 45b, and the first curved portion 45b, 45b is the first.
  • the curved portion 45a is more easily elastically deformed.
  • each web portion 41 is opposed to the expander 5, and each sliding surface 41a is inserted into the pin.
  • Brake shoes 40, 40 are arranged so as to face the anchor pin 26 protruding forward and backward from the hole 24.
  • the locking portions 46, 46 of the leaf spring 44 are inserted and locked into the locking holes 42a, 42a of the rim portions 42 from below, and the leaf spring 44 is fixed to the rim portions 42, 42.
  • the leaf spring 44 is attached to the rim portion 42 in a state of being elastically deformed so as to be pushed left and right as indicated by a two-dot chain line in FIG.
  • the leaf spring 44 when the leaf spring 44 is attached to the rim portion 42, the leaf spring 44 tends to be deformed to the original state (not elastically deformed) shown by the solid line in FIG.
  • the left and right inward elastic force acts on the rim portions 42 and 42. Due to this elastic force, the sliding surfaces 41a and 41a are held in a state where they are slidably contacted along the outer peripheral surfaces of the anchor pins 26 and 26.
  • a pair of front and rear return springs 47, 47 are straddled between the upper ends of the web portions 41, 41 of both brake shoes 40, 40. Therefore, the pressing surface 41b of the web portion 41 is pressed against the expander 5 by the urging force of the return spring 47, and when the brake operation is not performed (when the brake is released) as described later, 40 is held at a position that swings inward in the left and right directions.
  • the expander 5 is fixed to the anchor bracket 2 and disposed between the pressing surfaces 41 b and 41 b of both brake shoes 40 and 40.
  • the expander 5 will be described with reference to FIG. 5 showing a cross section of the expander 5.
  • the expander 5 includes a housing 51 that forms a wedge housing 51a at the center and extends to the left and right to form cylinders 51b and 51b that communicate with the wedge housing 51a.
  • the wedge 52, the sleeve assemblies 53 and 53 fitted to the cylinder portions 51b and 51b so as to be slidable to the left and right, and the sleeve assemblies 53 and 53 are screwed to extend outward in the left and right directions of the housing 51. Screw 57, 57.
  • the expander 5 is configured symmetrically, and FIG. 5 shows the state of the expander 5 when the brake is released on the left half and the state of the expander 5 when the brake is operated on the right half.
  • the wedge 52 is formed in a shaft shape, and is attached to the housing 51 so that it can be inserted and removed in the front-rear direction by the operation of a diaphragm (not shown) in the chamber 7 that receives the brake operating air pressure.
  • the wedge 52 is positioned forward by the urging force of the wedge spring 52 a and pulled out from the wedge accommodating portion 51 a when the brake is released.
  • the wedge spring 52a is moved backward in the wedge housing portion 51a against the urging force of the wedge spring 52a and is inserted into the wedge housing portion 51a.
  • the wedge 52 has a wedge-shaped insertion end 52b that is pointed toward the tip, and rollers 52c and 52c are pivotally connected to the left and right sides of the insertion end 52b.
  • the sleeve assembly 53 includes a tappet 54 having an inclined surface 54 a with which the roller 52 c abuts, and a sleeve 55 formed in a cylindrical shape and fitted to the tappet 54.
  • the sleeve 55 is formed with a screw insertion portion extending in the left-right direction, and a screw 57 is inserted and attached to the screw insertion portion. Therefore, the screw 57 is moved to the left and right in the cylinder portion 51b together with the sleeve assembly 53 (the tappet 54 and the sleeve 55).
  • the inclined surface 54a (the tappet 54) is pressed right and left outward by the roller 52c, and the tappet 54, the sleeve 55, and the screw 57 are integrated. Moved left and right.
  • the pressing surface 41 b (web portion 41) is pressed by the screw 57 that moves to the left and right outwards, and both brake shoes 40, 40 against the urging force of the return spring 47 are left and right with the anchor pins 26, 26 as swing centers. Swings outward.
  • the anchor bracket 2 is attached to the axle housing 8 using bolts, and then the expander 5 is attached to the anchor bracket 2.
  • the anchor pins 26, 26 are inserted into the pin insertion holes 24, 24 of the anchor bracket 2, and attached so that the front and rear ends of the anchor pins 26, 26 protrude forward and backward from the brake shoe support portion 25.
  • the brake shoes 40 and 40 are attached to the anchor bracket 2.
  • the brake shoes 40, 40 are arranged so as to surround the ring portion 23, the pressing surface 41 b of each web portion 41 is opposed to the expander 5, and each sliding surface 41 a is opposed to the anchor pin 26.
  • the locking portions 46 and 46 of the leaf spring 44 are inserted into the locking holes 42 a and 42 a of the rim portions 42 from below to be locked, and the leaf spring 44 is attached to the web portion 41.
  • the leaf spring 44 is attached to the rim portion 42 in a state of being elastically deformed so as to be pushed to the left and right, and therefore, the elastic force inwardly on the left and right acts on the rim portions 42 and 42 and the sliding surface.
  • 41a and 41a can be slidably contacted along the outer peripheral surface of the anchor pins 26 and 26. In this manner, the brake shoes 40, 40 are attached to the anchor bracket 2.
  • the drum brake B1 is configured to attach the leaf spring 44 to the bottom surfaces (side surfaces) of the rim portions 42, 42, for example, the leaf spring 44 is mounted on the work table with the rear surface of the drum brake B1 facing the front. 42, 42 can be attached.
  • the drum brake is inverted to attach the rear side anchor springs on the work table. Two steps of placing the leaf spring 44 are not required, and one step of attaching the leaf spring 44 is sufficient. For this reason, assembly work can be simplified and work efficiency can be improved.
  • leaf spring 44 is used in place of the anchor spring in this way, not only during assembly work of the drum brake B1, but also during maintenance of the drum brake B1, such as replacing the brake shoes 40, 40, etc. The effect of simplifying the maintenance work can be obtained. Further, the pair of (two) anchor springs can be replaced with one leaf spring 44 to reduce the number of parts, thereby reducing the manufacturing cost and facilitating parts management.
  • a pair of front and rear return springs 47, 47 are attached between the upper ends of the web portions 41, 41.
  • the return springs 47 and 47 are attached in this way, the pressing surface 41 b of the web portion 41 is pressed against the expander 5 (screw 57) by the urging force of the return spring 47.
  • the leaf spring 44 may be attached after the return springs 47 and 47 are attached.
  • the brake shoes 40, 40 resist the urging force of the return spring 47 to the left and right outwards with the anchor pins 26, 26 as swing centers. It is swung. Accordingly, the linings 43 and 43 are pressed against the inner peripheral surface of the brake drum 31, and the rotation of the brake drum 31 is braked by friction between the linings 43 and 43 and the brake drum 31, and the tire rotates integrally with the brake drum 31. Is braked.
  • the leaf spring 44 is elastically deformed so that each brake shoe 40 is swung and pushed left and right.
  • the leaf spring 44 is elastically deformed so that the first bending portion 45a formed so as to be easily elastically deformed with a narrow width in the base portion 45 is curved upward, so that the rim portions 42, 42 are provided.
  • the web portions 41 and 41 are held slidably along the outer peripheral surface of the anchor pin 26.
  • the operation of the drum brake B1 when the brake operation is released will be described.
  • the brake operation is released, the compressed air in the chamber 7a is discharged according to the release operation, and the insertion end portion 52b is extracted from the wedge housing portion 51a by the urging force of the wedge spring 52a (left side in FIG. 5). See section).
  • the insertion end portion 52b is pulled out in this manner, the brake shoes 40, 40 are swung in the left and right directions around the anchor pins 26, 26 by the urging force of the return spring 47, and the sleeve assembly. 53 and the screw 57 are integrally moved in the cylinder 51b toward the left and right inward.
  • the linings 43 and 43 are separated from the inner peripheral surface of the brake drum 31, and the braking of the tire that rotates integrally with the brake drum 31 is released.
  • the drum brake B2 includes a cam mechanism 150 that swings the brake shoes 40, 40 in accordance with a brake operation.
  • the cam mechanism 150 includes a slack 151 that swings up and down in response to a brake operation, a shaft 152 that is connected to the slack 151 and rotates integrally with the slack 151, and a rear end portion of the shaft 152. And a cam 153 formed integrally therewith.
  • the cam 153 is disposed between the roller pins 141b and 141b of the brake shoes 40 and 40, the arc-shaped left pressing surface 153L abuts on the roller pin 141b of the web portion 41 disposed on the left side, and the arc-shaped right pressing surface 153R. Comes into contact with the roller pin 141b of the web portion 41 disposed on the right side. Further, the leaf spring 44 is attached to the rim portions 42, 42 in the same manner as the drum brake B1 described above. For this reason, also in this drum brake B2, the effect of the structure which attaches the leaf spring 44 mentioned above from the bottom face (side surface) is acquired.
  • the pin 143 may be inserted into the web portions 41 and 41 and the roller 142 in a state where the cylindrical roller 142 is disposed on the pin 143, and the snap rings 144 and 144 may be attached to both ends of the pin 143.
  • the pin 143 is rotatably supported by the web portions 41 and 41, and the roller 142 is rotatably supported by the pin 143.
  • the operation of the drum brake B2 when the brake operation is released will be described.
  • the brake operation is released, the compressed air in the chamber 7b is discharged according to the release operation, and the slack 151 is swung upward by the urging force of the spring immediately below the diaphragm in the chamber 7b.
  • the cam 153 is integrally rotated in the direction opposite to the arrow A.
  • the left pressing surface 153L of the left web portion 41 against the roller pin 141b is weakened
  • the left web portion 41 against the roller pin 141b of the right web portion 41 is weakened.
  • the rightward pressing of the right contact surface 153R is weakened.
  • the brake shoes 40, 40 are swung in the left and right inward directions with the anchor pins 26, 26 as the rocking centers by the urging force of the return spring 47, respectively.
  • the linings 43, 43 are separated from the inner peripheral surface of the brake drum 31, and braking of the tire that rotates integrally with the brake drum 31 is released.
  • the configuration in which the sliding surface 41a formed corresponding to the diameter of the anchor pin 26 is brought into contact with the anchor pin 26 to swing the brake shoe 40 has been described as an example.
  • the portion where the anchor bracket 2 (anchor pin 26) and the brake shoe 40 (web portion 41) abut may have other shapes.
  • a drum brake B3 according to the modification is shown in FIG. 9, and the drum brake B3 will be described below.
  • the same members as those of the above-described drum brake B1 will be denoted by the same reference numerals and the description thereof will be omitted, and a description will be given focusing on a configuration different from the drum brake B1.
  • the drum brake B3 includes a pair of left and right anchor portions 226 and 226 formed in a block shape at the lower end portion of the brake shoe support portion 25.
  • a pair of receiving groove portions 227 and 227 are formed on the side surface of 226 in the front and rear direction.
  • a substantially arc-shaped anchor side contact portion 228 is formed at the bottom of the receiving groove portion 227.
  • a pair of front and rear contact support portions 241 and 241 that are slidably received in the receiving groove portion 227 of the anchor portion 226 are formed at the lower end portion of each web portion 41.
  • a substantially arc-shaped web-side contact portion 241 a is formed at the tip of the contact support portion 241.
  • each brake shoe 40 is swung right and left while maintaining the state in which the web side contact portion 241 a is in contact with the anchor side contact portion 228.
  • the shape of the leaf spring 44 shown in the above embodiment is an example, and is attached to the rim portions 42, 42 so that the sliding surfaces 41a, 41a can be slid along the outer peripheral surfaces of the anchor pins 26, 26. If the function of holding the contacted state is ensured, the leaf spring 44 can be configured in another shape.
  • the present invention can be applied to all floating anchor type drum brakes configured such that one end of the brake shoe 40 is slidably brought into contact with an anchor member.

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

Abstract

L'invention concerne un frein à tambour (B1) comportant un frein à tambour (31), des segments de frein (40) disposés le long de la surface périphérique intérieure du frein à tambour (31), et un ressort d'expansion (5) qui comprime les segments de frein (40) contre la surface périphérique intérieure du frein à tambour (31). Une extrémité des segments de frein (40) a des surfaces de pression (41b) qui entourent et entrent en contact avec le ressort d'expansion (5) des deux côtés du ressort d'expansion (5), et l'autre extrémité des segments de frein a des surfaces coulissantes (41a) qui sont mises en prise avec des axes d'ancrage (26). Les segments de frein (40), avec les surfaces de pression (41b) comprimées vers l'extérieur dans la direction de leur séparation mutuelle par le ressort d'expansion, sont entraînés à s'étendre avec un mouvement d'oscillation de manière centrée sur les surfaces coulissantes (41a) à des fins de compression contre la surface périphérique intérieure du frein à tambour (31). Un ressort à lames (44) sollicite les autres extrémités des segments de frein (40) dans la direction où les extrémités se rapprochent les unes des autres dans un état où les surfaces coulissantes (41a) sont respectivement mises en prise avec les axes d'ancrage (26), et le ressort à lames est attaché de manière à enjamber les extrémités des segments de frein (40).
PCT/JP2013/002304 2013-04-03 2013-04-03 Frein à tambour WO2014162355A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP2015509598A JPWO2014162355A1 (ja) 2013-04-03 2013-04-03 ドラムブレーキ
PCT/JP2013/002304 WO2014162355A1 (fr) 2013-04-03 2013-04-03 Frein à tambour
CN201380075226.1A CN105102841A (zh) 2013-04-03 2013-04-03 鼓式制动器

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Application Number Priority Date Filing Date Title
PCT/JP2013/002304 WO2014162355A1 (fr) 2013-04-03 2013-04-03 Frein à tambour

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WO2014162355A1 true WO2014162355A1 (fr) 2014-10-09

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PCT/JP2013/002304 WO2014162355A1 (fr) 2013-04-03 2013-04-03 Frein à tambour

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CN (1) CN105102841A (fr)
WO (1) WO2014162355A1 (fr)

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DE102019207664B3 (de) * 2019-05-24 2020-04-23 Continental Teves Ag & Co. Ohg Trommelbremse

Citations (7)

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JPS62181729U (fr) * 1986-05-12 1987-11-18
JPH0296044U (fr) * 1989-01-19 1990-07-31
JPH0322139U (fr) * 1989-07-13 1991-03-06
JPH0579427U (ja) * 1992-03-27 1993-10-29 株式会社ソキア カードの保持装置
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