JP3677235B2 - Brake shoe, manufacturing method and manufacturing apparatus thereof - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a brake shoe, a manufacturing method thereof, and a manufacturing apparatus.
[0002]
[Prior art]
A drum-type brake shoe for a vehicle includes a shoe body in which a web is provided inside a rim having an arc-shaped outer peripheral surface and a substantially T-shaped cross section, and a lining material bonded to the outer peripheral surface of the rim. Consists of.
In this brake shoe manufacturing method, a lining material composed of an inorganic material and an organic material is thermoformed in a circular arc shape in advance through various processes, and then the thermosetting property is applied to the inner peripheral surface of the lining material or the rim outer peripheral surface of the shoe body. A common method is to apply an adhesive made of resin, and pressurize and heat the two to integrate them (for example, JP-A-4-366039).
[0003]
[Problems to be solved by the invention]
However, the brake shoe obtained by the conventional manufacturing method has the following problems.
That is, as shown in FIG. 10, the side surface of the boundary between the rim 2 and the adhesive layer 3 of the shoe body 1 and the side surface of the boundary between the adhesive layer 3 and the lining material 4 are exposed, and moisture is released from the boundary. There are problems that it is easy to enter, the rim 2 is rusted, and the lining material 4 is easily peeled off. Reference numeral 5 denotes a web.
On the other hand, the lining material manufacturing process includes, for example, raw material blending, mixing, provisional molding, thermoforming, cutting, inner surface polishing, taper processing, adhesive application, and drying. There are processes such as bonding, drying, and deburring the material and the shoe body, and there is a problem that many processes and man-hours are required.
Accordingly, the present invention is made to solve the above-mentioned problems, and the object of the present invention is to prevent moisture from entering, to prevent rim rusting and to prevent lining material from peeling off, and to reduce man-hours. It is in providing the manufacturing method and manufacturing apparatus of a brake shoe.
[0004]
[Means for Solving the Problems]
The brake shoe according to the present invention includes a shoe body having a web provided on the inner side of a rim having an arc-shaped outer peripheral surface and having a substantially T-shaped cross section in the width direction, and an adhesive bonded to the outer peripheral surface of the rim. In the brake shoe comprising the lining material, the side surface of the boundary portion between the rim and the adhesive layer and the side surface of the boundary portion between the adhesive layer and the lining material on the both side wall surfaces in the width direction of the rim due to the flow-out portion of the lining material Is characterized by being covered.
Thus, by covering the boundary part with the lining material, it is possible to provide a brake shoe that prevents moisture from entering from the boundary part, prevents the rim from being rusted, and prevents the lining material from peeling off.
[0005]
The brake shoe manufacturing method according to the present invention includes a shoe body in which a web is provided inside a rim having an arcuate outer peripheral surface and the cross section in the width direction is substantially T-shaped, and is bonded to the outer peripheral surface of the rim. In the manufacturing method of a brake shoe made of a lining material, a concave arcuate inner bottom surface is formed, and a gap is formed between both side walls in the width direction of the rim of the shoe body to be inserted . Therefore, a step of placing a temporarily formed lining material on the inner bottom surface of the cavity in the lower mold having a cavity having a width larger than the width of the rim, and a shoe body with an adhesive applied to the outer peripheral surface of the upper mold A step of inserting the shoe body into the cavity of the lower mold with the outer peripheral surface side of the shoe body set in the upper mold facing the lining material side, and the lower mold and the upper mold are relatively added. With pressure The lining material is heated to flow into the gap between the inner wall surface of the cavity and the side wall surface of the rim, and finally formed into an arc-shaped lining material along the inner bottom surface of the cavity, and at the same time, the lining material is bonded. And a step of adhering to the outer peripheral surface of the shoe main body with an agent.
According to the above method, the brake shoe can be easily manufactured, and it is only necessary to temporarily form the lining material. When the pressure and heating are performed in the mold, the lining material is formed into the lining material and the shoe body. Since it can be bonded to the same at the same time, the number of man-hours can be greatly reduced and the cost can be reduced.
[0006]
Further, when the lower mold and the upper mold are relatively pressed, the rim can be pressed evenly against the lining material by pressing the edge of the inner peripheral surface of the rim with a pressing plate provided on the upper mold. Therefore, the deformation of the rim can be prevented and a brake shoe with good dimensional accuracy can be provided.
[0007]
The brake shoe manufacturing apparatus according to the present invention includes a shoe body having a web provided inside a rim having an arc-shaped outer peripheral surface and having a substantially T-shaped cross section in the width direction, and an adhesive bonded to the outer peripheral surface of the rim. In the brake shoe manufacturing apparatus comprising a lining material, a concave arcuate inner bottom surface is formed, and a gap is to be formed between both side walls of the rim of the shoe body when inserted. A lower mold that has a cavity with a width larger than the width of the rim, can be placed on the inner bottom surface of the cavity, and a shoe body with an adhesive applied to the outer peripheral surface can be set The set shoe body has an upper mold that can be attached to the lower mold so that the outer peripheral surface side faces the lining material side and is inserted into the cavity, and the upper mold includes the lower mold and the upper mold. Pressurized relative to the mold The time, which can press the edge of the said rim peripheral surface, with a plate-shaped pressing part pressing surface is an arc-shaped is provided, in the upper mold, when the shoe body is set, the shoe A holding portion for holding the shoe main body is provided so that the main body does not fall.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a front view showing an example of the shoe main body 11, and FIG. 2 is a bottom view thereof.
The shoe body 11 is provided with a web 13 inside a rim 12 having an arcuate outer peripheral surface, and has a substantially T-shaped cross section. A portion indicated by a broken line is the lining material 14.
[0009]
3 and 4 show the lower die 15 in the manufacturing apparatus, FIG. 3 is a sectional view thereof, and FIG. 4 is a plan view thereof.
As shown in FIG. 3, the lower mold 15 has a cavity 16 that forms a concave arcuate inner bottom surface 16a. The inner bottom surface 16 a is formed in the same size as the outer peripheral surface of the lining material 14. In other words, the inner bottom surface 16 a is a molding surface of the lining material 14.
The width of the cavity 16 is set slightly larger than the width of the rim 12 of the shoe body 11.
The depth of the cavity 16 is such that at least a portion of the shoe body 11 where the lining material 14 is formed can enter.
On both end sides of the cavity 16, step portions 17 having a height slightly lower than the upper surface are provided.
[0010]
Next, FIGS. 5 and 6 show the upper mold 20 in the manufacturing apparatus, FIG. 5 is a sectional view thereof, and FIG. 6 is a bottom view thereof.
At both end portions on the lower surface side of the upper mold 20, a regulation step portion 21 that protrudes into the step portion 17 of the lower mold 15 and restricts the amount of entry into the lower mold 15 is projected. The shoe body 11 can be held between the regulation step portions 21 and 21.
That is, the stopper pins 22, 22 are provided on the opposing surfaces of the both regulation step portions 21, 21 so as to be able to enter the opposing surfaces. The stopper pins 22 and 22 are disposed in holes 23 and 23 provided on the opposing surfaces of the regulation step portions 21 and 21, and are urged by the springs 24 and 24 so that the rounded tip protrudes a required length. When pressed against the urging force of the springs 24, 24, the springs 24, 24 are provided so as to enter the holes 23, 23 inward. The stopper pins 22 and 22 are prevented from coming off by a stopper (not shown) at a position protruding a required length.
[0011]
As shown in FIG. 5, when the shoe body 11 is pushed into the space between the restricting step portions 21, 21 with the arc surface of the rim 12 facing downward, the stopper pin 22 is pressed against the outer peripheral surface of the rim 12. , 22 are pushed in, and conversely, the shoe body 11 is held by the pressing force from the stopper pin 22 without dropping to the lower surface side of the upper mold 20.
Although the holding means is configured by the stopper pin 22, the spring 24, etc., the holding means is not limited to this.
[0012]
As shown in FIG. 6, two pressing plates 25, 25 are provided in parallel on the lower surface of the upper mold between the regulating step portions 21, 21.
The pressing plates (plate-like pressing portions) 25, 25 are located on the inner peripheral edges 12a, 12a (FIG. 2) of the rim 12 when the shoe body 11 is mounted between the restricting step portions 21, 21. The pressing surface (lower end surface) has an arc shape along the inner peripheral surface of the rim 12 so that it can be pressed from the side.
Note that the pressing plates 25 and 25 do not have to be arcuate plates having a complete front shape. If the protruding portions or the like make a spatial obstacle by forming a protruding portion on the web 13 or the like, In order to avoid this, a notch (not shown) may be provided as appropriate.
The pressing plates 25, 25 can enter the cavity 16.
[0013]
A brake shoe is manufactured using the upper and lower molds (manufacturing apparatus) as follows.
First, the lining material 14 is blended with known lining materials made of organic and inorganic materials, mixed and then temporarily formed into a required shape. Since a known material is used as the lining material, an explanation is omitted, but an organic material is mixed as a binder with an inorganic material, and is formed into an arc-like plate shape that is substantially along the inner bottom surface 16a of the cavity 16 of the lower mold 15. Temporary molding is performed (refer to FIG. 7). Temporary molding is sufficient in a situation where an inorganic material is pressed and held by a binder. Further, the lining material 14a having a required width and length is adjusted by cutting or the like.
[0014]
The temporarily formed lining material 14a is inserted into the cavity 16 of the lower mold 15 (FIG. 8).
Next, the shoe body 11 in which an adhesive made of a thermosetting resin is applied on the outer peripheral surface of the rim 12 is mounted and held on the upper mold 20 as shown in FIG.
The upper mold 20 with the shoe body 11 set as described above is placed on the lower mold 15 so that the shoe body 11 is inserted (entered) into the cavity 16 with the outer peripheral surface side of the shoe body 11 facing the lining material 14a. Set (FIG. 8).
[0015]
The upper and lower molds 15 and 20 assembled as described above are subjected to heat treatment while being pressed by a hot press machine (not shown) in a direction in which the lining material is pressed and hardened.
As described above, since pressure and heat are applied, the lining material 14a is pressed against the inner bottom surface 16a of the cavity 16 and fired into the lining material 14 having a required thickness and a required shape. At the same time, the lining material 14 is bonded onto the outer peripheral surface of the rim 12 by an adhesive of thermosetting resin.
[0016]
At that time, since the pressing plates 25 and 25 press the edge of the inner peripheral surface of the rim 12 evenly in the length direction of the rim 12, the lining material 14 a is pressed evenly without the rim 12 being bent, Finally, a brake shoe having excellent dimensional accuracy can be manufactured.
Since the upper mold 20 is pressed until the regulation step portions 21 and 21 come into contact with the step portions 17 and 17 of the lower mold 15, a product in which the thickness of the lining material 14 does not vary is obtained.
[0017]
Further, as described above, the width of the cavity 16 is set to be slightly larger than the width of the rim 12 of the shoe body 11. For this reason, the lining material 14a is molded in a state where the lining material 14a flows into the space between the inner wall of the cavity 16 and the side wall surface of the rim 12 by being pressurized and heated. That is, the lining material 14 a is molded in a state where it flows into the side wall surface side of the rim 12.
Accordingly, as shown in FIG. 9, the flow-out portion 14 b of the lining material 14 a covers the boundary portion between the rim 12 and the adhesive layer 27 and the boundary portion between the adhesive layer 27 and the lining material 14 from the outside. Become.
As described above, since the boundary portion is covered with the lining material 14, it is possible to provide a brake shoe that can prevent moisture from entering the boundary portion, prevent the rim 12 from being rusted, and prevent the lining material 14 from peeling off.
In addition, after pressurization and heating, the product is taken out from the mold, and after firing, chamfering or the like is performed on necessary portions of the lining material 14 to complete the final product.
[0018]
In the above embodiment, an example of a single die is shown. However, it is possible to manufacture with high productivity by using a multiple die.
[0019]
【The invention's effect】
As described above, according to the brake shoe according to the present invention, the boundary portion is covered with the lining material, thereby preventing moisture from entering from the boundary portion, preventing the rim from being rusted, and preventing the lining material from peeling off. Brake shoes can be provided.
Further, according to the method and apparatus for manufacturing a brake shoe according to the present invention, the brake shoe can be easily manufactured, and it is only necessary to temporarily mold the lining material. Since the main molding of the material to the lining material and the adhesion to the shoe body can be performed at the same time, the number of steps can be greatly reduced, and the cost can be reduced.
[Brief description of the drawings]
FIG. 1 is a front view showing the shape of a shoe body,
FIG. 2 is a bottom view of the shoe body,
FIG. 3 is a sectional view of a lower mold,
FIG. 4 is a plan view of the lower mold,
FIG. 5 is a cross-sectional view of the upper mold,
FIG. 6 is a bottom view of the upper mold,
FIG. 7 is an explanatory view showing a lining material in a temporarily formed state,
FIG. 8 is a cross-sectional explanatory view showing the assembled state of the mold,
FIG. 9 is an explanatory diagram showing a state where the boundary side surface is covered by the flow of the lining material;
FIG. 10 is an explanatory diagram of a conventional brake shoe.
[Explanation of symbols]
11 Shoe body 12 Rim 13 Web 14 Lining material 14a Lining material 15 Lower die 16 Cavity 16a Inner bottom surface 17 Step portion 20 Upper die 21 Restriction step portion 22 Stopper pin 23 Hole 24 Spring 25 Press plate 27 Adhesive layer

Claims (4)

A brake shoe comprising a shoe body having a web provided inside a rim having an arcuate outer peripheral surface and having a substantially T-shaped cross section in the width direction, and a lining material bonded to the outer peripheral surface of the rim with an adhesive. In
The flow-out portion of the lining material covers the side surface of the boundary between the rim and the adhesive layer and the side surface of the boundary between the adhesive layer and the lining material on both side walls in the width direction of the rim. Brake shoe. Brake shoe manufacturing method comprising: a shoe body having a web provided inside a rim having an arcuate outer peripheral surface and having a substantially T-shaped cross section in the width direction; and a lining material bonded to the outer peripheral surface of the rim In
A concave arcuate inner bottom surface is formed, and a cavity having a width larger than the width of the rim is provided in order to form a gap between both side walls in the width direction of the rim of the shoe body to be inserted. Placing a tempered lining material on the inner bottom surface of the cavity in the lower mold;
Setting the shoe body with the adhesive applied to the outer peripheral surface to the upper mold;
Inserting the shoe body into the cavity of the lower mold with the outer peripheral surface side of the shoe body set in the upper mold facing the lining material side;
The lower mold and the upper mold are relatively pressurized and heated to cause the lining material to flow into the gap between the cavity inner wall surface and the rim side wall surface, thereby forming an arc shape along the cavity bottom surface. And a step of bonding the lining material onto the outer peripheral surface of the shoe main body with an adhesive at the same time as the main molding of the lining material.   3. The method for manufacturing a brake shoe according to claim 2, wherein when the lower mold and the upper mold are relatively pressed, an edge of the inner peripheral surface of the rim is pressed by a pressing plate provided in the upper mold. Brake shoe manufacturing apparatus comprising: a shoe body having a web provided inside a rim having an arcuate outer peripheral surface and having a substantially T-shaped cross section in the width direction; and a lining material bonded to the outer peripheral surface of the rim. In
A concave arcuate inner bottom surface is formed, and a cavity having a width larger than the width of the rim is provided so as to form a gap between both side walls of the rim of the shoe body when inserted . A lower mold in which a lining material temporarily formed on the inner bottom surface of the cavity can be disposed;
An upper mold that can be mounted on the lower mold so that the shoe body with the adhesive applied to the outer peripheral surface can be set and the set shoe body is inserted into the cavity with the outer peripheral surface side facing the lining material side And
The upper die is provided with a plate-like pressing portion that can press the edge of the inner peripheral surface of the rim when the lower die and the upper die are relatively pressed, and the pressing surface forms an arc shape. And a brake shoe manufacturing apparatus , wherein the upper mold is provided with a holding portion for holding the shoe body so that the shoe body does not fall when the shoe body is set .

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