WO2000041846A1

WO2000041846A1 - Method of manufacturing brake shoe and device used for the method

Info

Publication number: WO2000041846A1
Application number: PCT/JP2000/000066
Authority: WO
Inventors: Haruo Komine; Akira Nishimura
Original assignee: Japan Brake Industrial Co., Ltd.
Priority date: 1999-01-11
Filing date: 2000-01-11
Publication date: 2000-07-20
Also published as: AU1892500A; JP2000205319A; JP4618825B2

Abstract

A method of manufacturing a brake shoe, comprising the steps of laminating at least one band-shaped friction lining on a brake shoe main body through an adhesive agent layer so as to form a laminated body, bringing a plurality of releasable heat resisting rubber-made elastic members which are installed in a rigid holder into contact with the outer peripheral surface of the friction lining, and heating while pressing the laminated body by pressing these elastic members against the laminated body in inner radial direction so as to bond the brake shoe main body to the friction lining; and those devices used for the method.

Description

TECHNICAL FIELD The manufacturing method and apparatus of a brake shoe

TECHNICAL FIELD The present invention relates to a method and an apparatus for manufacturing a brake shoe by laminating a friction lining on a brake shoe body via an adhesive, and heat-pressing the body. Background art

In the method of manufacturing a brake shoe assembly used for a drum brake, the work of bonding the brake shoe body and the friction lining using an adhesive is performed by applying a thermosetting adhesive to the dried brake shoe body. Are laminated via an adhesive, and then thermocompression-bonded. The pressure applied during heating and compression is usually applied by attaching a synthetic holder to both ends of a spring band made of spring steel plate, bringing both holders close to the laminated body, and rubbing the portion between the two holders of the pressure band. This is done by pressing against the outer peripheral surface of the lining.

However, although a thin spring steel plate is used as the pressing band to follow the radially outer peripheral surface of the lining of the laminate, its followability is not sufficient, and uniform pressing is difficult. If the pressure is not uniform, there will be a part that is not adhered between the brake shoe body and the friction lining, or a part that has insufficient adhesion. In addition, when performing continuous bonding, the spring steel plate becomes hot due to heat conduction from the laminate, causing troubles such as bonding to the friction lining with the adhesive attached to the outer peripheral surface of the friction lining during lamination. Sometimes. Further, there is a problem that the pressurizing band may be cut off during pressurizing and heating due to the strong tension applied during pressurizing, and it is difficult to perform stable continuous bonding. Disclosure of the invention

The present invention relates to a method of manufacturing a brake shoe by heating and pressurizing a brake shoe body and a friction lining using an adhesive, thereby producing a brake shoe. It is an object of the present invention to provide a method that can improve the uniformity of a cloth and that can perform stable continuous bonding without fear of damage to a pressure member.

Another object of the present invention is to provide an apparatus suitably used in the above method.

That is, the present invention provides a brake shoe body having a belt-shaped shoe rim curved in an arc shape and at least one shoe rib projecting radially inward from the shoe rim, and a radially outer peripheral surface of the shoe rim. At least one belt-shaped friction lining is laminated via an adhesive layer to form a laminate, and a plurality of mold releasability mounted on rigid holders are respectively formed along the arc on the radially outer peripheral surface of the friction lining. An elastic member made of heat-resistant rubber is brought into contact with each other, and each elastic member is pressed radially inward against the laminate, thereby heating the laminate while pressurizing the laminate. And a method of manufacturing a brake shoe characterized by adhering the friction lining and the friction lining.

Also, the present invention provides a brake shoe body having a band-shaped shrim which is curved in an arc shape and at least one shroud projecting radially inward from the shear, and a radially outer circumferential surface of the shrim. An apparatus for manufacturing a brake shoe comprising at least one belt-shaped friction lining thermocompressed via an adhesive layer,

(A) A laminated body composed of the brake shoe body and a friction lining laminated on the radially outer peripheral surface of the shoe rim via an adhesive layer is directed radially inward from the friction lining outer peripheral surface. Laminate support means for supporting in place against pressure;

(B) a plurality of releasable heat-resistant rubber elastic members each having an abutting surface capable of abutting a part of the outer peripheral surface of the friction lining, and each elastic member being separately mounted. A plurality of pressure members consisting of a plurality of rigid holders;

(C) bringing the pressing members into close proximity to the laminate, bringing the contact surfaces of the plurality of elastic members into contact with the radially outer peripheral surface of the friction lining along an arc shape, and connecting each elastic member to the laminate. Pressing means for pressing in a radially inward direction with respect to the pressure member to release the pressing by separating the pressing member from the laminate;

(D) heating means for heating the laminate And a manufacturing apparatus for a brake shoe. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a perspective view showing an example of a laminate in which a brake shoe main body and a friction lining used in the present invention are laminated via an adhesive layer.

FIG. 2 is a partial plan view showing one embodiment of the device of the present invention.

FIG. 3 is a partial cross-sectional view of the apparatus of FIG. 2 taken along a cutting line XX.

FIG. 4 is a partial cross-sectional view of the device of FIG. 2 taken along a cutting line Y-Y.

FIG. 5 is a partial cross-sectional view of the apparatus of FIG. 2 taken along a cutting line XX.

FIGS. 6A, 6B and 6C are explanatory views illustrating the structure of the heating means of the apparatus of FIG. BEST MODE FOR CARRYING OUT THE INVENTION

The brake shoe body used in the method of the present invention includes a belt-shaped shoe rim curved in an arc shape and at least one shoe rib protruding radially inward from the shoe rim. For example, the brake shoe body may have one shoe rib extending in the length direction through the center in the width direction of the shoe rim and projecting inward in the radial direction, or the inner peripheral surface side of the shoe rim. It may have a pair of parallel shoe ribs projecting radially inward from the edge.

The material of the brake shoe body is usually a metal, for example, SPC steel plate is suitable, but other materials having a certain degree of elasticity such as aluminum, aluminum alloy, mild steel, high-tensile plastic, sintered metal, etc. Can be used. The brake shoe body may be coated with a primer for protection against corrosion and corrosion. Examples of the primer include resins that are generally used as an adhesive.For example, a thermosetting adhesive such as a phenolic resin-based adhesive or an epoxy resin-based adhesive may be used in a solvent such as methanol, methyl ethyl ketone, and toluene. The solution dissolved in the paint is applied to the body of the brush, and the solvent is removed by heating and dried or cured to form a primer coating.

The friction lining constitutes the friction surface of the brake shoe. Friction Rainy For example, non-metallic single fibers such as asbestos and glass fibers are mixed with a binder of a thermosetting resin and, if necessary, additives such as a friction modifier, and are heated under pressure and heated. The rim is formed into a curved plate shape that can contact the outer peripheral surface of the rim. The adhesive is applied to the radial outer peripheral surface of the brake rim and / or the radial inner peripheral surface of the friction lining, and the adhesive is dried by hot air drying to form an adhesive layer. The friction lining is formed on the outer peripheral surface of the shell via the adhesive layer to form a laminate.

FIG. 1 is a perspective view of a laminated body 1 used in one embodiment of the present invention. The laminated body 1 is provided on an outer peripheral surface of a shoe rim 11 of a brake shoe main body 11 with an adhesive layer 13 interposed therebetween. Friction lining 1 2 is laminated. In this embodiment, the brake shoe main body 1 1 1 has a band-shaped shear rim 1 1 1 having an arc shape having two substantially opposite ends 1 1 3 and a radial direction from both side edges of the brake rim 1 1 1. It has a pair of parallel shear ribs 112 protruding inward.

The adhesive is not particularly limited, and various types of adhesives such as a solvent volatile adhesive, a thermosetting adhesive, and a hot melt adhesive can be used. Usually, a thermosetting adhesive is suitable, and for example, a phenol resin-based epoxy resin-based adhesive having a strong resistance to impact bending and peeling is preferably used.

A plurality of releasable heat-resistant rubber elastic members mounted on rigid holders are brought into contact with each other along the arc shape on the radial outer peripheral surface of the friction line of the laminate, and the respective elastic members are laminated. The laminate is heated while pressing the laminate by pressing it radially inward against the body. When a plurality of friction linings are laminated, a plurality of elastic members are used for each friction lining. In this way, the plurality of elastic members are brought into contact with the friction lining along an arc shape and pressed inward in the radial direction, so that it is almost vertically uniform over the entire bonding surface between the friction lining and the shrim. High pressure is applied, and the friction lining and the rim can be bonded uniformly and firmly. In addition, the releasable heat-resistant rubber elastic member has good followability to the outer peripheral surface of the friction lining when pressurized, so that it can reliably contact a predetermined contact portion of the outer peripheral surface of the friction lining, and can be uniformly formed. Pressurization is possible. Furthermore, since the elastic member is made of a releasable heat-resistant rubber, even if an adhesive is adhered to the radially outer peripheral surface of the friction lining, the elastic member is formed. The material does not adhere to the friction lining. Further, even when the heat and pressure bonding is continuously performed, the elastic member does not become high in temperature as in the case of the spring steel plate, and the heating temperature of the laminate during continuous bonding does not fluctuate.

The pressurization by the elastic member is preferably performed at every 180 ° or less, preferably at every 30 ° to 90 ° at the central angle of the arc shape of the brake shoe body. In addition, in order to perform uniform pressing, it is preferable that a plurality of elastic members be brought into contact with the entire outer peripheral surface of the friction lining and pressurized. However, the friction lining formed as described above is required. Since it has a certain degree of rigidity, it is not necessary to make the elastic member contact the entire outer peripheral surface of the friction lining. For example, the pressing may be performed while leaving a non-contact surface having a width of 0 to 3 cm, preferably 0 to 1 cm between adjacent elastic members.

As a method of pressing with an elastic member, a sheet-like material having a contact surface (bending surface) in contact with the outer peripheral surface of the friction lining on one surface is used as the elastic member, and the back surface (curved surface) of the contact surface is used. A plurality of pressurizing members are constructed by separately attaching each elastic member to a rigid individual holder having a curved surface that comes into contact with the holder, with the back surface of the contact surface of the elastic member being in close contact with the curved surface of the holder. It is preferable that the pressure member is moved toward and away from the laminate to perform pressure and pressure release. The surface on which the elastic member of the holder is not necessarily bent, but in order to perform uniform pressurization, the outer peripheral surface of the friction lining and the surface on which the elastic member of the holder is mounted need to be pressurized. It is preferable that the bay bend so that it exists on a concentric circle. When a sheet-like material is used as the elastic member, its thickness is usually preferably from 1 to 30 mm, more preferably from 5 to 20 mm.

Also, since the pressurization is usually performed in one direction for each elastic member toward the center of the arc shape, even if the holder has the curved surface as described above, the pressure is applied to the center of the curved curved surface. Tend to concentrate. Therefore, when one elastic member is brought into contact with the outer peripheral surface of the friction lining in a wide central angle range, the radius of the contact surface (bend surface) of the elastic member is smaller than the radius of the outer peripheral surface of the friction lining. For example, the pressure distribution can be made more uniform. The pressure of the pressure is preferably pressurized at the same pressure in all of the elastic member, typically, it is pressed in. 7 to 3 0 kg pressure of Z cm ² preferably.

Examples of the releasable heat-resistant rubber that is a material of the elastic member include silicone rubber and fluorine rubber. Examples of the silicone rubber include dimethylpolysiloxane raw rubber, methylphenylpolysiloxane raw rubber, methylvinylpolysiloxane raw rubber, cyano, alkylmethylpolysiloxane raw rubber, methylvinylpolysiloxane raw rubber, cyano, and alkylmethylpolysiloxane raw rubber. Examples thereof include those obtained by vulcanizing an organopolysiloxane such as alkyl fluoride, methyl, or polyxan raw rubber with a vulcanizing agent such as an organic peroxide. An inorganic filler such as silica powder, silica gel, calcined clay, calcined clay, calcium carbonate, iron oxide powder, zirconium silicate powder, titanium oxide powder, and zinc oxide powder may be blended. Further, additives such as zirconyl nitrate, zirconate metal salt, zirconium silicate, carbon black, and Teflon powder may be added.

Examples of the fluororubber include a copolymer of trifluorochloroethylene and vinylidene fluoride, and a copolymer of hexafluoropropylene and vinylidene fluoride.

By changing the hardness of the elastic member, followability and pressure transmission can be adjusted. Usually, the hardness and the elastic modulus of the elastic member are preferably from 40 to 80, more preferably from 50 to 80, as measured by JIS AHS.

Examples of the method for heating the laminate include hot air heating in a heating furnace, a method for heating the laminate, particularly a metal member heated to the body of the brake, by contacting or approaching the member with heat conduction or radiant heat, There is no specific limitation, for example, a method of generating heat by directly energizing the brake shoe body. Among them, heating by heat conduction or radiant heat and heating by direct energization are preferable for efficient, simple and uniform heating.

The temperature of the brake shoe body during pressurization and heating varies depending on the type of adhesive and, in the case of thermosetting adhesives, the curing temperature, etc. The temperature is preferably 0 to 300 ° C. The time of pressurizing and heating is preferably different depending on the type of the adhesive and the heating temperature, for example, 2 to 5 minutes at 220 to 300 ° C.

The method of the present invention can be suitably implemented, for example, by using the device of the present invention.

In the apparatus of the present invention, the laminate supporting means may be configured such that the laminate is formed on an outer peripheral surface of the friction lining. There is no particular limitation as long as it can be supported at a fixed position with respect to the pressure inward in the radial direction. For example, when the laminate has the shape shown in FIG. 1, the outer surface of one of the ribs may be directed downward to support the laminate horizontally, or the rib surface may be vertical. May be supported. However, since the brake shoe body with the structure shown in Fig. 1 is usually made of a material with some elasticity, the brake shoe body faces inward in the radial direction at the time of pressurizing and heating in order to apply uniform pressure. You need to support it so that it does not bend. Therefore, it is preferable that at least a plurality of jigs are brought into contact with and supported by the jigs at the radially inner ends of both the shrouds or the inner peripheral surface of the shear rim. For example, the laminate supporting means for supporting the laminate having the structure shown in FIG. 1 includes a mounting surface that comes into contact with a part of the outer surface of one of the shoe ribs, and a radially inner side of at least one of the shoe ribs. A fixing jig having a plurality of fixing jigs each having, on its upper surface, a convex portion in which a part of a side surface is in contact with a part of an end portion is exemplified. In this case, the laminated body is supported horizontally by contacting a plurality of portions of the outer surface of one of the shear ribs with the mounting surface of the fixing jig, and comes into contact with the radially inner end of at least one of the plurality of shear ribs at a plurality of portions. The convex portion supports the projection at a fixed position against the pressure during the pressurization. Furthermore, a mounting table having two mounting surfaces that contact the lower surfaces of both ends of the brake shoe main body, and a convex portion whose side surface contacts the opposite surfaces of both ends of the brake shoe main body may be provided. When such a mounting table is provided, the laminate is horizontally supported by the mounting surface of the fixing jig and the mounting surface of the mounting table. As a result, it is supported at a fixed position against the pressing at the time of pressing. Further, the fixing jig and the mounting table further include a mounting surface that partially contacts one side surface of the friction lining of the laminated body in order to prevent the friction lining from being displaced during heating under pressure. May be.

If the brake shoe body has a sub-arc-shaped shear rim, use a fixing jig having a curved surface that fits on the inner peripheral surface of the shoe rim. The surfaces may be abutted and supported.

The material of the laminate support means is not particularly limited as long as it has a rigidity capable of supporting the laminate at a fixed position against the pressing during pressurization and does not deform due to heat during heating. . However, when the metal brake shoe body is directly heated by energization, at least the portion in contact with the brake shoe body is made of a non-conductive material. Need to be something. For example, a portion that comes into contact with the brake shoe body, a material that is coated with a ceramic layer by ceramic spraying, or the like can be used. In the case where the brake shoe body is coated with a primer or the like, a portion of the brake shoe body that adheres to the brake shoe body may be coated with a releasable heat-resistant resin in order to prevent transfer. As the releasable heat-resistant resin, for example, the above-mentioned silicone rubber, fluorine rubber, silicone resin, fluorine resin and the like are suitable. Examples of the silicone resin include methyl silicone resin, phenylmethyl silicone resin, alkyd-modified silicone resin, and melamine-modified silicone resin. Examples of the fluorine resin include trifluoroethylene ethylene (Teflon). ), Poly (fluorochloroethylene), copolymers of tetrafluoroethylene and hexafluoropropylene, polymers and copolymers of vinyl fluoride, vinylidene vinylidene, dichlorodifluoroethylene, and the like.

The pressurizing members of the apparatus of the present invention each include an elastic member made of a releasable heat-resistant rubber having a contact surface that comes into contact with a part of the outer peripheral surface of the friction lining, and an elastic member mounted thereon. It consists of a rigid holder. Examples of the material of the elastic member, preferred embodiments of the elastic member and the holder, and the like are the same as those described above in the description of the method of the present invention. As described above, if a holder having a curved surface is used as the holder and a sheet-shaped elastic member is attached to the curved surface with a dowel pin or the like, the elastic member can be easily attached and detached. In addition, the elastic member can be easily replaced even during continuous heating and pressure bonding. The material of the holder is preferably a rigid metal, for example, iron, steel, aluminum, aluminum alloy, copper alloy and the like.

As the pressing means, each pressing member is brought close to the laminated body, and the contact surfaces of the elastic members of the wind number are brought into contact with the radially outer peripheral surface of the friction lining in an arc shape to stack the elastic members. Any material can be used without particular limitation as long as it can be pressed radially inward against the body and the pressing member can be released from the laminate to release the pressing. For example, when a hydraulic cylinder is suitably used and the laminated body has a structure shown in FIG. 1, a plurality of hydraulic cylinders are arranged around a fixed position of a predetermined laminated body, and a tip of each hydraulic cylinder is arranged at a tip of each hydraulic cylinder. The holder of the pressure member is engaged, and the pressure is released and the pressure is released by the reciprocating motion of the hydraulic cylinder. As means for heating the laminate, there are a laminate supporting means, a pressurizing member and a hot-air heating furnace capable of accommodating the pressurizing means, a laminate, or a heat conducting member in contact with or in close proximity to the breach of the laminate. Alternatively, means for heating by radiant heat may be used. A specific example of the latter is a heater having a metal housing having a surface capable of contacting or approaching the laminate or the brake shoe of the laminate, such as an aluminum heater, an induction heating plate, or the like. And heating devices such as heaters incorporating a cartridge heater. Further, a method of heating the heat medium filled in the housing can also be adopted. When the brake shoe body is made of metal, the anode and cathode electrodes may be brought into contact with the brake shoe body, and electricity may be applied to cause the brake shoe body to generate heat. The drawback is that uniform heating is relatively difficult.

Heating means comprising a metal member and the above-described heating device for heating the metal member because of its thermal conductivity having a surface capable of contacting or approaching the laminate or the brake shoe body of the laminate. May be used. For example, a metal member having good heat conductivity is brought into contact with the heating device and used. According to this method, it is not necessary to form the heating device itself in a complicated manner according to the shape of the laminated body and the main body of the brake, and the cost can be reduced.

When the laminate has the structure shown in Fig. 1, a heating device or a heat conductive metal member having a surface that comes into contact with or close to the outer surface of the shroud is used. It is preferable that the heat conductive metal member be in contact with or close to. When the brake shoe body has a subarc-shaped shrim, a heating device or a heat conductive metal member having a curved surface that can abut or approach the inner peripheral surface of the shrim is used. Is preferred. In this case, the heating device or the heat conductive metal member may be used also as a support means and a heating means for the laminate.

If there is a risk that the primer on the surface of the brake body may transfer to a male mold due to contact with the heating device or the heated heat conductive metal member, the brake device of the heating device or the heat conductive metal member may be used. The part to be adhered to the main body may be coated with a releasable heat-resistant resin.

FIG. 2 is a partial plan view showing one embodiment of the device of the present invention. Figure 2 shows the stack The body supporting means, the pressing member and the pressing means are shown, and the laminate is shown by a dotted line. FIG. 3 is a partial cross-sectional view taken along section line XX of FIG. Cross sections are shown only for the laminate, the laminate support means and the pressurizing means. FIG. 4 is a partial cross-sectional view taken along the line Y-Y of FIG. 2 and further shows a state in which heating means is arranged. In the device of this embodiment, the laminated body 1 is supported horizontally with the outer surface of one of the ribs 11 of the brake shoe main body 11 facing downward. The stacked body support means includes two fixing jigs 2 and one mounting table 3. In FIG. 3, the mounting table 3 is not shown. Each fixing jig 2 has three pins 21, 22, and 23 protruding from the upper surface. The upper surface of the pin 21 forms a mounting surface 2 1 1 that contacts the side surface of one of the brake ribs 1 1 2 of the brake shoe 1 1. The pin 22 protrudes higher than the pin 21 to form a protruding portion 221, and the side surface of the protruding portion 22 1 is in contact with the radially inner end of one of the shoe ribs 11 2. Partial contact. The pin 23 has, on its upper surface, a mounting surface 231, which partially contacts the side surface of the friction lining. The mounting table 3 has two mounting surfaces 3 1, 3 1 ′ that contact the lower surfaces of both ends of the brake shoe main body 11, and a side surface that faces the opposite ends of the brake shoe main body 11 1. It has a convex portion 32 that comes into contact. The stacked body 1 is horizontally supported by the mounting surfaces 2 1 1 and 2 1 3 of the two fixing jigs 2 and the mounting surfaces 3 1 and 3 1 ′ of the mounting table 3 to fix the two The convex portion 2 2 1 of the jig 2 and the convex portion 32 of the mounting table 3 support the fixing position in response to the pressing during pressing. In the laminate 1 used in this embodiment, two friction linings 1 and 2 are laminated, and one friction lining 12 is arranged, three pressing members 4 and three pressing means 5 are arranged. I have. In order to explain the operation of the pressing member 4 and the pressing means 5, one friction lining is shown in a state where three pressing members 4 are pressing close to the laminate 1, and the other friction lining is shown. Shows a state in which the three pressure members 4 are separated from the laminate 1 and the pressure is released. Each of the pressing members 4 includes a sheet-like elastic member 41 having a contact surface 4 11 (bending surface) on one surface which contacts the outer peripheral surface of the friction lining 12, and a contact surface 4 1. It consists of a rigid holder 4 2 having a curved surface 4 2 1 abutting on the back surface (curved surface) of 1. The elastic member 41 is mounted such that the back surface of the contact surface 4 1 1 1 is in close contact with the curved surface 4 2 1 of the holder 4 2. In this embodiment, six hydraulic cylinders 15 are arranged around the fixed position of the laminated body 1 as a pressing means. One at the end of each hydraulic cylinder The holder 42 of the pressing member 4 is engaged. The six hydraulic cylinders 5 normally operate simultaneously. Due to the reciprocating motion of the hydraulic cylinder 5, each of the six pressurizing members 4 moves along the guide 6 and approaches the laminate 1, and the contact surface 4 1 1 of the elastic member 4 1 is frictionally lined 1 2 Closely press against the outer peripheral surface of, press and release to release the pressure.

FIGS. 4 and 5 are partial cross-sectional views showing a heating means used in the apparatus of the embodiment shown in FIG. FIG. 4 is a partial cross-sectional view taken along the line XY when the heating means is arranged in the apparatus of FIG. 1, and FIG. 5 is a partial cross-sectional view taken along the line XX. In this apparatus, two sets of heating means, that is, an upper heating means 7 and a lower heating means 8 are used. The upper heating means 7 is composed of a heat conductive metal member 71 having a surface 71 1 that can approach or contact almost the entire outer surface of one shroud 112 of the brake shoe main body 11; The heater comprises a heater 72 for heating the conductive metal member 71. The heat conductive metal member 71 is mounted in contact with the heater 72, conducts heat from the heater 72, and receives heat conduction or radiation from the outer surface of one of the shrouds 112. Heat the laminate 1. The lower heating means 8 includes a heat conductive metal member 81 having a surface 811 which can approach or contact the outer surface of the other shoe rib 112, and a heat source for heating the heat conductive metal member 81. — Consists of tar 8 2 The heat conductive metal member 81 is mounted in contact with the heater 182, conducts heat from the heater 182, and generates heat by heat conduction or radiation from the outer surface of the one shroud 112. Heat the laminate 1. In the device of this embodiment, since the supporting means exists at the lower part of the laminate 1, the concave portion 8 12 is formed on the upper surface of the heat conductive metal member 81.

FIGS. 6A, 6B and 6C illustrate the shapes of the heat conductive metal member 71 of the upper heating means 7 and the heat conductive metal member 81 of the lower heating means 8 shown in FIGS. 4 and 5. FIG. 6A is a partial plan view of the support means and the laminate shown in FIGS. 4 and 5, FIG. 6B is a bottom view of the heat conductive metal member 71 of the upper heating means 7, and FIG. 6 is a plan view of a heat conductive metal member 81 of the heating means 8. In FIG. 6B and FIG. 6C, the portions where the heat conductive metal members 71 and 81 abut or come close to the shoe ribs are hatched.

The heaters 7 2 and 8 2 are forced into a metal housing 7 2 1 or 8 2 This is a metal built-in heater into which a heater 72 or 8222 is inserted, and 723 and 823 are terminals of a power draw heater.

In this embodiment, the upper heating means 7 and the lower heating means 8 are movably arranged. After the laminate 1 is supported by the support means, the upper heating means 7 and the lower heating means 8 are brought close to the laminate, for example, in the direction of an arrow, and the heat conductive metal members 71 and 81 are indicated by the two-dot chain line. The laminated body is heated by abutting or approaching the outer surface of each shroud 111. Preferably, the pressurization and the heating are performed simultaneously. After performing the thermocompression bonding for a predetermined time, the upper heating means 7 and the lower heating means 8 are separated from the laminate 1 and the laminate 1 is removed from the support means. As a means for vertically moving the heating means, for example, an air cylinder is preferably used. Industrial applicability

ADVANTAGE OF THE INVENTION According to the method and apparatus of this invention, when heating and pressurizing a brake shoe main body and a friction lining using a bonding agent, the uniformity of the pressure distribution of the bonding surface at the time of pressurization is improved. Thus, it is possible to manufacture a brake shoe in which the brake shoe body and the friction line are uniformly and strongly bonded. In addition, failures of the pressurizing device during continuous thermocompression bonding are significantly reduced, and stable continuous thermocompression bonding becomes possible.

Claims

The scope of the claims

1. Adhered to the radially outer peripheral surface of the shoe rim, to a brake shoe main body having a belt-shaped shoe rim curved in an arc shape and at least one shoe rib protruding radially inward from the shoe rim. At least one belt-shaped friction lining is laminated via a layer of the agent to form a laminate, and a plurality of release heat-resistant members mounted on rigid holders along the arc shape on the radially outer peripheral surface of the friction lining. A rubber elastic member is brought into contact with each other, and each elastic member is pressed in a radially inward direction with respect to the laminate, thereby heating the laminate while pressing the laminate. A method for manufacturing a brake shoe, comprising bonding the friction lining.

2. The brake shoe body is composed of an arc-shaped curved belt-shaped rim having two substantially opposite ends, and a pair of parallel ribs projecting radially inward from both side edges of the rim. The method of claim 1.

3. The method according to claim 1, wherein the heat-resistant rubber is silicone rubber.

4. A brake shoe body having a strip-shaped rim curved in an arc shape and at least one shroud protruding radially inward from the rim, and an adhesive layer on a radially outer peripheral surface of the rim. An apparatus for producing a brake shoe comprising at least one belt-shaped friction lining thermocompressed via:

(A) A laminated body composed of the brake shoe main body and a friction lining laminated on an outer peripheral surface in a radial direction of the shoe rim via an adhesive layer is radially inward from the outer peripheral surface of the friction lining. Laminate support means for supporting in place against pressure toward

(B) a plurality of releasable heat-resistant rubber elastic members each having a contact surface capable of contacting a part of the outer peripheral surface of the friction lining; and a plurality of rigid members to which each elastic member is separately mounted. A plurality of pressurizing members consisting of one holder;

(C) bringing the pressing members into close proximity to the laminate, bringing the contact surfaces of the plurality of elastic members into contact with the radially outer peripheral surface of the friction lining along an arc shape, and connecting each elastic member to the laminate. To Pressing means for pressing in a radially inward direction to release the pressing by separating the pressing member from the laminate;

(D) heating means for heating the laminate

An apparatus for manufacturing a brake shoe, comprising:

5. The heating means comprises a heat conductive metal member having a surface which can approach or come into contact with the brake body of the laminate, and a heating device for heating the heat conductive metal member. Item 4. The apparatus according to Item 4.

6. The brake body has an arcuately shaped band-shaped shrimper having two substantially opposite ends, and a pair of parallel shrouds protruding radially inward from both side edges of the shrimm. 5. The device according to claim 4, comprising a rib.

7. Two sets of the heating means, wherein the heat conductive metal member of one of the heating means has a surface which can approach or contact the outer surface of one of the shear ribs of the brake body, and the other heating means 7. The device according to claim 6, wherein the heat conductive metal member of the means has a surface which can approach or abut on the outer surface of the other shear rib.

8. The apparatus according to claim 4, wherein said heat-resistant rubber having releasability is silicone rubber.

9. The elastic member is a sheet-like material having a corresponding contact surface on one surface, and the holder has a curved surface which abuts against a back surface of the corresponding contact surface of the elastic member. 5. The apparatus according to claim 4, wherein the elastic member is mounted on the holder such that a back surface of an abutting surface thereof abuts on the curved surface of the holder.