JPH0662234U - Drum brake with automatic shoe clearance adjustment - Google Patents

Abstract

(57) [Abstract] [Purpose] When the strut device between a pair of brake shoes is overextended and the rotating drum cannot be removed, the brake shoe can be easily and quickly reduced in diameter from the outside of the backing plate. (EN) Provided is a drum brake having an automatic shoe clearance adjusting function, which does not require so much force to reduce the diameter of the brake shoe and does not increase the cost. A protrusion 76 protruding toward the shoe rim 22 side is provided at the tip of the parking lever 40 and abutted against a protrusion 78. A through hole 80 is provided in a portion of the top of the protrusion 78 that is slightly opposite to the shoe web 24 from the protrusion 76, and a through hole 82 is provided in a position corresponding to the protrusion 76 of the backing plate 10. The protrusion 76 is inserted into the backing plate 10 by the hooking jig 84 inserted from the through hole 82.
It is moved to the side and dropped into the through hole 80 and the space 88.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a drum brake having an automatic shoe clearance adjustment function, and more particularly, to a drum brake provided with a parking lever and an extendable strut device.

[0002]

[Prior art]

 It has a plate-shaped shoe rim bent in an arc shape and a plate-shaped shoe web protruding from the inner peripheral surface of the shoe rim, and the shoe web is placed on one side of the backing plate in a state parallel to the one side. One of the pair of brake shoes, the pair of brake shoes arranged so as to be able to open each other, the shoe return spring that is stretched between the pair of brake shoes and urges them in the radial direction, The brake lever of one of the shoe shoes is rotatably mounted on one surface of the shoe web so as to be rotatable about an axis, and is extended between the parking lever and the other brake shoe in a longitudinal shape. The pair of brake shoes is provided with a strut device capable of preventing the diameter reduction beyond a certain limit and extending in the longitudinal direction. The braking force is applied to the brake shoe and the strut device is extended due to the wear of the brake shoe, so that the inner peripheral surface of the rotating drum arranged on the outer peripheral side of both brake shoes and the brake shoe There is known a drum brake having an automatic shoe clearance adjusting function of automatically adjusting a clearance (shoe clearance) when the vehicle is not being controlled.

In such a drum brake, normally, a shoe hold down device having a shoe hold down pin and a shoe hold down spring is provided between the shoe web of a pair of brake shoes and the backing plate, and both brake shoes are provided. While being pressed against one side of the backing plate by the urging force of the shoe hold down springs arranged on the shoe web, the strut device has the one end of the strut device that separates the shoe web and the parking lever of one brake shoe with a predetermined clearance. In a state in which it is sandwiched and held, it is bridged between a portion which is an intermediate portion in the longitudinal direction of the parking lever and is located in the vicinity of the rotation axis thereof and the other brake shoe.

In the above-described drum brake having the automatic shoe clearance adjusting function, if the strut device is excessively extended due to over-adjustment and the shoe clearance disappears, the rotating drum cannot be removed from the outer peripheral side of the brake shoe. Therefore, the diameter of the brake shoe is reduced as follows, for example.

That is, an extension portion extending toward the backing plate is provided at a side edge portion of the U-shaped leaf spring as a shoe hold down spring located on the inner circumferential side of the shoe web, and the extension portion extends to the backing of the shoe web. By preventing the parking lever arranged on the plate side surface from rotating more than a certain limit in the non-braking direction, the diameter of the brake shoe is prevented from being reduced more than a certain limit, and the extension of the backing plate is If the rotating drum cannot be removed from the outer circumference of the brake shoe due to over-adjustment, etc., by providing a through hole at the corresponding position, insert a tool such as a driver into the through hole and insert the extension. By lifting the U-shaped leaf spring together with the U-shaped leaf spring in a direction away from the backing plate, the parking lever and the extension portion are separated from each other. The contact in the direction of rotation of the king lever is released, and the parking lever is rotated in the non-braking direction in accordance with the urging force of the shoe return spring, which reduces the diameter of the brake shoe.

Further, a star wheel having outer peripheral teeth provided between a pair of strut members is extended by being rotated in one direction by an adjust lever that is rotated with the expansion of the brake shoe. In the case of the drum brake equipped with the strut device of the type with automatic shoe clearance adjustment function, a tool such as a screwdriver is inserted through the through hole provided at the position corresponding to the star wheel of the backing plate to adjust the lever. By rotating the star wheel in the direction opposite to the one direction with the outer teeth of the star wheel disengaged from each other, the strut device is shortened and the diameter of the brake shoe is reduced.

[0007]

[Problems to be solved by the device]

 However, when a dedicated shoe hold-down device having the above-mentioned extending portion is provided on one brake shoe having the parking lever as described above, a normal shoe hold-down device for a pair of brake shoes is provided. Since the drum brake is costly and the set load of the shoe hold down spring is relatively high, it is possible to lift the above-mentioned extension part against the urging force of the shoe hold down spring with a tool. It had the drawback of requiring relatively large force. Further, as described above, in order to reduce the diameter of the brake shoe, the tool is thrust from the outside of the backing plate to release the engagement between the adjusting lever and the outer peripheral teeth of the star wheel, and rotate the star wheel by a necessary and sufficient amount. The operation was relatively difficult and time-consuming.

The present invention has been made in view of the above circumstances. The purpose of the present invention is to prevent the rotating drum from being removed due to excessive extension of the strut device between the pair of brake shoes. In this case, the brake shoe can be easily and quickly reduced in diameter from the outside of the backing plate, and the shoe clearance automatic adjustment function does not require so much force to reduce the diameter of the brake shoe and the cost does not increase so much. To provide a drum brake.

[0009]

[Means for Solving the Problems]

 The gist of the present invention for achieving the above object is to have a plate-shaped shoe rim curved in an arc shape and a plate-shaped shoe web projecting from the inner peripheral surface of the shoe rim. The web is stretched between a pair of brake shoes and a pair of brake shoes arranged so that the web is parallel to one surface of the backing plate so as to be able to expand each other, and urges them in the radial direction. A shoe return spring, a parking lever provided on one surface of the shoe web of one of the pair of brake shoes so as to be rotatable about an axis, and the parking lever has a longitudinal shape. A strut device that is bridged between the other brake shoe and that prevents the pair of brake shoes from contracting beyond a certain limit and that can be extended in the longitudinal direction. In a drum brake having a shoe clearance automatic adjustment function of automatically adjusting the shoe clearance by extending the strut device as the brake shoe wears, the rotation axis of the parking lever is At the opposite end of the brake shoe, there is provided a protrusion that protrudes toward the shoe rim side of the one brake shoe and is abutted against the shoe rim according to the urging force of the shoe return spring, and corresponds to that protrusion of the backing plate. At that position, a predetermined jig for separating the protrusion from one surface of the shoe web of the one brake shoe is provided with a through hole into which the other side of the backing plate is inserted, while the shoe rim of the shoe rim is inserted. The part located on the opposite side of the shoe web from the part where the protruding part is abutted In is to the projecting portion by the jig provided with a recess in which the protrusion is incorporated drop when brought into a predetermined amount away from the one surface of the Shuwe drive.

[0010]

[Action]

 In the drum brake having the automatic shoe gap adjusting function having such a configuration, the shoe gap is eliminated by the excessive extension of the strut device due to the over-adjustment and the rotating drum cannot be removed from the outer peripheral side of the pair of brake shoes. If this happens, insert a specified jig through the through hole provided at the position corresponding to the protruding part of the parking lever of the backing plate, and use that jig to separate the protruding part from the one surface of the shoe web by a specified amount. By doing so, the protrusion is dropped into the recess provided in the shoe rim. As a result, the parking lever is rotated in the non-braking direction according to the urging force of the shoe return spring, and the diameter of the pair of brake shoes is reduced, so that the rotary drum can be removed.

[0011]

[Effect of device]

 According to the drum brake with the automatic shoe clearance adjusting function of the present invention, it is sufficient to provide the parking lever with the protrusion, the shoe rim with the recess, and the backing plate with the through hole. Since the normal shoe hold down device can be shared, the cost of the drum brake is not increased so much. Further, as described above, the one end of the strut device sandwiches a portion or the like located in the vicinity of the rotation axis of the parking lever with a predetermined gap, and the protruding portion is the rotation axis of the parking lever. Since it is provided at the tip of the parking lever, which is relatively far away from the end of the heart and strut device, and the above-mentioned recess can be provided at a position close to the part where the protruding part of the shoe abuts. , It does not require so much force to separate the protruding portion of the parking lever from the one surface of the shoe web by the predetermined amount, and thus does not require so much force to reduce the diameter of the brake shoe. Further, since it is only necessary to separate the protruding portion of the parking lever from one surface of the shoe web by the jig inserted through the through hole of the backing plate, the diameter of the brake shoe can be reduced easily and quickly.

[0012]

【Example】

 An embodiment of the present invention will be described below in detail with reference to the drawings.

FIG. 3 is a view showing a main part of a drum brake having a shoe clearance automatic adjusting function to which the present invention is applied. In this figure, a pair of arcuate brake shoes 14 and 16 are mounted on one surface 12 of the backing plate 10 so as to be able to expand each other by shoe hold down devices 18 and 18. The brake shoes 14 and 16 include a plate-shaped shoe rim 22 bent in an arc shape, a flat shoe web 24 protruding from an inner peripheral surface of the shoe rim 22 and substantially parallel to the one surface 12, and a shim. A lining 26 fixed to the outer peripheral surface of the purim 22 is provided. The shoe hold-down device 18 described above includes a U-shaped plate spring 28 arranged on the shoe web 24, a swing web provided on the backing plate 10 at one end, and the shoe web 24 and the U-shaped plate spring 28. And a shoe hold down pin 30 for pre-loading the U-shaped leaf spring 28 between the shoe head 24 on the other end side and the shoe web 24.

The opposite ends of the shoe webs 24 of the brake shoes 14, 16 are engaged with a pair of pistons (not shown) of a wheel cylinder 32 fixed on one surface 12 of the backing plate 10, and The other ends of the brake shoes 14 and 16 are brought into contact with the side surfaces of the anchor 34 fixed on the one surface 12 of the backing plate 10 according to the urging force of the spring 36. On one surface 38 (see FIG. 1) of the shoe web 24 of one of the brake shoes 14 facing the backing plate 10, a parking lever 40 having a longitudinal plate shape is rotated by a pin 42 at one end located near the wheel cylinder 32. It is movably attached. In FIG. 3, reference numeral 44 is a parking cable connected to the other end of the parking lever 40.

Between the shoe webs 24 of the brake shoes 14 and 16, a shoe return spring 46 that constantly urges the shoe webs 24 toward each other in a radial direction is stretched at a position close to the wheel cylinder 32. A lengthwise strut device 48, which prevents the diameter reduction of 14 and 16 beyond a certain limit and is extended due to the wear of the lining 26, is bridged at a position close to the shoe return spring 46.

As shown in FIGS. 3 and 4, the strut device 48 includes an elongated strut 50 located on the brake shoe 14 side and a quarland 52 located on the brake shoe 16 side. The strut 50 includes a first portion 53 and a second portion 54 that extends in parallel with the first portion 53 in a state of being displaced from one end of the first portion 53 by a predetermined amount in the plate thickness direction. A plurality of latching teeth 56 are formed at a position that is one end of the portion 53 and is displaced from the second portion 54 in the direction along the plate surface by a predetermined amount, and at the other end of the first portion 53. A notch 58 extending toward the second portion 54 is formed on the tip surface of the portion. The strut 50 is constantly urged toward the brake shoe 14 side by the spring 60 in a state where the shoe web 24 of the brake shoe 14 and the parking lever 40 are sandwiched in the notch 58 with a predetermined gap in the plate thickness direction. Note that, in FIG. 4, the gap in the notch 58 is not shown.

The quarland 52 includes a fan-shaped portion 64 having a large number of engaging teeth 62 formed on an arcuate outer peripheral surface, and an arm portion 66 protruding in one direction from the base side of the fan-shaped portion 64. The pin 68 projecting from the base side of the fan-shaped portion 64 can be pivoted into the slot 70 provided at the end of the second portion 54 of the strut 50 opposite to the first portion 53. Attached to. The arm portion 66 is inserted into the engagement hole 72 formed in the shoe web 24 of the brake shoe 16 with a predetermined gap, and between the pin 68 and the one end portion of the first portion 53. Is provided with a spring 74 having a smaller biasing force than the spring 60. The biasing force of the spring 74 causes the engaging tooth 62 of the quarland 52 to engage with the latch tooth 56 of the strut 50. Has become.

In the drum brake configured as described above, when the pair of pistons of the wheel cylinder 32 are projected, the brake shoes 14 and 16 are expanded and pressed against the inner peripheral surface of the rotating drum (not shown). By this, braking is performed. When the brake shoes 14 and 16 are expanded, the quarland 52 is rotated clockwise in FIG. 4 due to the wear of the linings 26, and the engaging teeth 62 of the quarland 52 engage the locking teeth 56 of the strut 50. By overcoming one, the overall length of the strut device 48 is extended, whereby the diameter-reduced positions of the brake shoes 14, 16 are updated to the outer peripheral side and the outer peripheral surface of the lining 26 when not braking. The clearance (shoe clearance) between the inner surface of the rotating drum and the inner peripheral surface is automatically adjusted. On the other hand, when the parking lever 44 is rotated counterclockwise in FIG. 3 by the parking cable 44, the brake shoes 14 and 16 are expanded and braked through the strut device 48 and the pin 42. The shoe clearance adjustment operation and the parking brake operation are well known and are not necessary for understanding the present invention, and thus detailed description thereof will be omitted.

Here, in the present embodiment, as shown in FIGS. 1 to 3, a protrusion 76 protruding toward the shoe 22 side of the brake shoe 14 is further provided at the end of the parking lever 40 on the parking cable 44 side. A part of the shoe rim 22 is formed at the position corresponding to the projecting portion 76 of the shoe rim 22 so that the shoe rim 22 extends from the vicinity of the shoe web 24 to the vicinity of the edge of the shoe rim 22. A convex portion 78 is formed across the portion. The tip of the projecting portion 76 of the parking lever 40, which is biased in the non-braking direction (clockwise direction in FIG. 3) via the strut device 48 by the biasing force of the shoe return spring 46, has the top of the projecting portion 78. The parking lever 40 is prevented from rotating beyond a certain limit in the non-braking direction, and the brake shoes 14 and 16 are prevented from being reduced in diameter beyond a certain limit. It is like this.

Further, as shown in FIGS. 1 and 2, at the position which is the top of the convex portion 78 and is slightly separated from the shoe web 24 to the opposite side from the portion where the protruding portion 76 abuts. A through hole 80 into which the protruding portion 76 can be fitted is formed, and a through hole 82 having a predetermined size is formed at a position corresponding to the protruding portion 76 of the backing plate 10. . Thus, for example, when the strut device 48 is excessively extended due to the over thrust and the shoe gap disappears and the rotating drum cannot be removed from the outer peripheral side of the brake shoes 14 and 16, as shown in FIG. , A rod-shaped hooking jig as shown by 84 is inserted from the other surface 86 side of the backing plate 10 through the through hole 82, and the tip end of the hooking jig 84 is hooked on the protruding portion 76 of the parking lever 40. When the protrusion 76 is moved from the one surface 38 of the shoe web 24 by a predetermined distance to the through hole 80 of the protrusion 78 by pulling it toward the backing plate 10 side by the shoe return spring 46, it is attached in the non-braking direction. The projecting portion 76 of the parking lever 40 which is biased has its through hole 80 and Are incorporated dropped in part space 8 within 8 in 78. As a result, the parking lever 40 is rotated in the non-braking direction by a predetermined amount to reduce the diameter of the brake shoes 14 and 16, so that the rotary drum can be removed. Therefore, in this embodiment, the through hole 80 and the space 88 form a recess. When the parking lever 40 is rotated in the braking direction after the rotary drum is removed, the protrusion 76 is released from the through hole 80 and the space 88, so that the parking lever 40 is squeezed by the protrusion 76. It can be easily returned to the original position close to the one surface 38 of the web 24.

Here, FIGS. 5 and 6 are views showing a main part of a conventional drum brake having a function of automatically adjusting a shoe clearance, and a shoe hold down device on a brake shoe side in which a parking lever is arranged. Is shown. In the following description, the same parts as those in this embodiment are designated by the same reference numerals, and detailed description will be omitted. In these drawings, the shoe hold down device 100 has a U-shaped leaf spring 28 and a shoe hold down pin 30 which are substantially similar to the shoe hold down device 18 of the present embodiment, and the U shape thereof is shown. At the edge of the leaf spring 28, which is in contact with the shoe web 24, on the side opposite to the shoe 22, a predetermined amount is extended to the backing plate 10 side on the inner peripheral side of the shoe web 24 and to the shoe rim 22 side at its tip. An extension 102 that projects a predetermined amount is integrally provided. As a result, the longitudinal intermediate portion of the parking lever 40 is abutted against the surface of the extending portion 102 opposite to the shoe rim 22 to prevent the parking lever 40 from rotating beyond a certain limit in the non-braking direction. On the other hand, when the rotary drum cannot be removed due to over-adjustment or the like, a tool such as a screwdriver is inserted through the through hole provided in the backing plate 10 and the extending portion 102 is formed into a U-shaped leaf spring. By lifting together with 28 in the direction away from the backing plate 10, the extension 102 and the parking lever 40 are disengaged from each other in the rotation direction of the parking lever 40 as shown by the alternate long and short dash line in FIG. The diameter of the brake shoes 14, 16 can be reduced by rotating the parking lever 40 in the non-braking direction. It has become the jar.

However, in such a conventional case, one brake shoe 14 provided with the parking lever 40 is provided with the dedicated shoe hold-down device 100 having the above-mentioned extending portion 102, and a pair of brake shoe 14 is provided. Since the normal shoe hold-down device 18 cannot be shared by the brake shoes 14 and 16, there is a drawback that the cost of the drum brake is high, and if the set load of the U-shaped leaf spring 28 is relatively high, the brake shoe 12 is not provided. There is a drawback that a relatively large force is required to lift the extending portion 102 against the urging force of the U-shaped leaf spring 28 with a tool in order to reduce the diameters of 14 and 14.

On the other hand, according to the present embodiment, when the strut device 48 is excessively extended due to overadjustment or the like and the rotating drum cannot be removed, the strut device 48 is inserted from the outside of the backing plate 10 through the through hole 82. The hooking jig 84 moves the protrusion 76 of the parking lever 40 toward the backing plate 10 by a predetermined amount and drops it into the through hole 80 formed in the protrusion 78 of the shoe rim 22 and the space 88. , 16 are reduced in diameter by a predetermined amount, the parking lever 40 is provided with a projecting portion 76, the shoe rim 22 is provided with a convex portion 78 having a through hole 80, and the backing plate 10 is provided with a through hole 82. It is only necessary to provide a pair of brake shoes 14 and 16 with an ordinary shoe shoe. While the pull-down device 18 can be used in common, the protrusion 76 can be easily integrally formed at the time of stamping or casting the parking lever 40, and the projection 78 and the through hole 82 having the through hole 80 can be easily formed. Since it can be easily formed on the shoe rim 22 and the backing plate 10 by pressing, there is an advantage that the cost of the drum break is not increased so much.

Further, according to the present embodiment, the end of the strut device 48 opposite to the second part 54 of the first part 53 is located near the pin 42 which is the rotation axis of the parking lever 40. The shoe web 24 is sandwiched with a predetermined gap, and the protrusion 76 of the parking lever 40 is provided at the tip end portion of the parking lever 10 which is relatively separated from the end portions of the pin 42 and the first portion 53. In addition, since the through hole 80 is provided in a position close to the portion of the protrusion 78 where the protrusion 76 is abutted, the hooking jig 84 causes the protrusion 76 of the parking lever 40 to move to the protrusion 78. Since it does not require so much force to move to the through hole 80, this causes the parking lever 40 to rotate in the non-braking direction to reduce the diameter of the brake shoes 14, 16. Has the advantage of not requiring much power.

Further, according to this embodiment, the brake shoes 14, 16 can be removed by simply pulling the protrusion 76 of the parking lever 40 toward the backing plate 10 by the hooking jig 84 inserted from the through hole 82 of the backing plate 10. There is an advantage that the diameter can be reduced easily and quickly.

Although one embodiment of the present invention has been described above with reference to the drawings, the present invention can be applied to other aspects.

In the above-described embodiment, the recess is formed by the through hole 80 at the top of the protrusion 78 formed on the shoe rim 22 and the space 88 in the protrusion 78, but this is not always necessary. For example, the recess may be formed only by a through hole provided in the shoe rim 22 where the convex portion 78 is not formed, or the size of the convex portion 78 in the width direction of the shoe rim 22 may be reduced, and the protruding portion 76 of the parking lever 40 may be reduced. The parking lever 40 may be rotated in the non-braking direction by separating the shoe lever 24 from the one surface 38 of the shoe web 24 and dropping it from the top surface of the convex portion 78. In the latter case, it can be said that the peripheral portion of the convex portion 78 of the shoe rim 22 and the portion located on the side opposite to the shoe web 24 corresponds to the concave portion in the claims.

Further, in the above-described embodiment, the strut 50 having the latching teeth 56 and the quarland 52 having the engaging teeth 62 for engaging with the latching teeth 56 are provided, and the brake shoes 14, 16 are expanded. The quarland 52 is rotated to update the meshing positions of the retaining teeth 56 and the engaging teeth 62, and the struts 48 are arranged to be extended to provide an automatic shoe clearance adjusting function. The case where the present invention is applied to a drum brake has been described.A star wheel having outer peripheral teeth provided between a pair of strut members is provided by an adjusting lever that is rotated as the brake shoe is expanded. A driver equipped with a shoe clearance automatic adjustment function of a type that is provided with a strut device configured to be extended by being rotated in one direction. The present invention can also be applied to a ram brake. In a drum brake equipped with a strut device having such a star wheel and having an automatic shoe clearance adjustment function, a through hole is usually provided at a position corresponding to the star wheel of the backing plate. Insert a tool such as a screwdriver to release the engagement between the adjust lever and the outer teeth of the star wheel, and rotate the star wheel in the opposite direction to the one direction to shorten the strut device and reduce the brake shoe. It is configured so that the diameter can be reduced, and thus the tool is thrust from the outside of the backing plate to release the engagement between the adjusting lever and the outer peripheral teeth of the star wheel and rotate the star wheel by a necessary and sufficient amount. Drum brakes that have the drawback of being relatively difficult and time consuming to operate If even application of the present invention Oite, effects that can be optionally over-adjustment or the like can not remove the rotary drum Te odor decrease the diameter of the brake shoes more easily and quickly can be obtained.

Further, in the above embodiment, the parking lever 40 is provided on the surface 38 of the shoe web 24 on the side of the backing plate 10, but when it is provided on the surface of the shoe web 24 on the side opposite to the backing plate 10. The present invention can also be applied to. In this case, when the parking lever 40 is lifted away from the backing plate 10, the protrusion 76 of the parking lever 40 is dropped into the recess.

Besides, the present invention can be variously modified without departing from the spirit thereof.

[Brief description of drawings]

FIG. 1 is an enlarged view of a main part of a cross section taken along line I-I of FIG.

FIG. 2 is a view showing a state in which a protrusion is dropped into a recess of a brake shoe in FIG.

FIG. 3 is a view showing a main part of a drum brake having an automatic shoe clearance adjusting function to which the present invention is applied.

FIG. 4 is an enlarged view of an essential part of a cross section taken along line IV-IV of FIG. 3.

5 is a view showing a main part of a conventional drum brake having a shoe clearance automatic adjusting function, and is a view of a shoe holddown device 18 and the like on the brake shoe 14 side in FIG. 3 as seen from the brake shoe 16 side. It is a corresponding figure.

6 is a sectional view taken along line VI-VI of FIG.

[Explanation of symbols]

 10: backing plate 12: one side 14, 16: brake shoe 22: shoe rim 24: shoe web 38: one side 40: parking lever 42: pin 46: shoe return spring 48: strut device 76: protrusion {80: through hole, 88 : Space} recess 84: hooking jig 86: other surface

Claims (1)

[Scope of utility model registration request] 1. A plate-shaped shoe rim bent in an arc shape and a plate-shaped shoe web projecting from an inner peripheral surface of the shoe rim, the shoe web being parallel to one surface of a backing plate. A pair of brake shoes arranged on the one surface so as to be capable of expanding each other, a shoe return spring which is stretched between the pair of brake shoes and urges them in a radial direction, and a pair of the brake shoes. One of the brake shoes of one of them is a parking lever provided on one surface of the shoe web so as to be rotatable about an axis, and is extended between the parking lever and the other brake shoe in a longitudinal shape. A strut device capable of preventing the diameter reduction of the pair of brake shoes beyond a certain limit and extending in the longitudinal direction, and extending the strut device with wear of the brake shoes. In a drum brake having a shoe clearance automatic adjustment function of automatically adjusting the shoe clearance by being driven, the end of the parking lever opposite to the rotation axis is provided to the shoe rim side of the one brake shoe. A protrusion is provided which is protruded and abuts the shoe rim according to the biasing force of the shoe return spring, and the protrusion is provided at a position corresponding to the protrusion of the backing plate from one surface of the shoe web of the one brake shoe. While a predetermined jig for separating is provided with a through hole that is inserted from the other surface side of the backing plate, at a portion of the shoe rim located on the opposite side of the shoe web from the portion where the protruding portion is abutted. , The protrusion when the protrusion is separated from the one surface of the shoe web by the jig by a predetermined amount. A drum brake with a shoe clearance automatic adjustment feature, which is equipped with a recess into which the shoe is dropped.