JP4316576B2 - Anchor block for vehicle parking brake - Google Patents

Description

The present invention relates to an anchor block of the vehicle parking brake for holding a brake shoe to be pressed against the drum.

  In general, an anchor block of a vehicle parking brake for holding a brake shoe pressed against a drum when a parking brake is operated is known (for example, see Patent Document 1). This type of anchor block is equipped with a flange and a shaft integrally, the flange is fixed to the backing plate on the vehicle body side, a pair of brake shoes are held on the shaft so as to be able to expand, and when the parking brake is activated, A pair of brake shoes are expanded with the shaft as a fulcrum via a wire, and a braking force is applied by pressing the brake shoes against the drum on the axle side.

A conventional anchor block is manufactured by manufacturing a material including a flange and a shaft by hot forging or casting, and then machining necessary parts such as a part that holds a brake shoe in the subsequent process by machining. ing.
JP-A-2005-113996

  However, conventionally, since the flange and the shaft are made of an integral material, in the subsequent process, a great amount of machining man-hour is required for cutting the mounting surface of the flange to the backing plate and cutting the portion holding the brake shoe of the shaft. Therefore, there is a problem that the product yield is lowered and the manufacturing cost is increased.

Therefore, the object of the present invention is to eliminate the above-mentioned problems of the prior art and greatly reduce the processing man-hours required for cutting the mounting surface of the flange to the backing plate and for cutting the part holding the brake shoe of the shaft. The object of the present invention is to provide an anchor block for a parking brake for a vehicle that can reduce the production yield and greatly reduce the manufacturing cost.

To achieve the above object, according to the present invention, a metal plate is punched out by progressive feeding using a fine blanking press in an anchor block of a vehicle parking brake for holding a brake shoe pressed against a drum when the parking brake is operated. The flange plate having a fitting hole penetrating the metal plate, and a metal shaft that is fitted in the fitting hole of the flange plate and holds the brake shoe, The shaft is formed with at least a large diameter portion 5B, a first small diameter portion 5C, and a second small diameter portion 5D having a smaller diameter than that. And an inclined hole 3C that connects the step hole 3B and the fitting hole 3A, and the first small diameter portion 5C of the shaft is used as the fitting hole. The flange plate and the shaft are integrated by extending the first small diameter portion 5C and the second small diameter portion 5D into the step hole 3B and the inclined hole 3C and performing welding over the step hole 3B and the inclined hole 3C. It is characterized by that.
Further, the present invention is an anchor block of a vehicle parking brake for holding a brake shoe pressed against a drum when the parking brake is operated, and is formed by punching a metal plate by progressive feeding with a fine blanking press. It consists of at least two parts: a flange plate having a fitting hole that penetrates the plate, and a metal shaft that is fitted in the fitting hole of the flange plate and holds the brake shoe. A portion 5B, a first small diameter portion 5C, and a second small diameter portion 5D having a smaller diameter are formed, and a step hole 3B is formed in the process of the forward feed process on the escape side of the fitting hole of the flange plate. 1 The small diameter part 5C is press-fitted into the fitting hole, and a part 91 of the first small diameter part 5C protruding outside the step hole 3B is crimped. Wherein the integrated flange plate and the shaft by coupling met with the caulking portion Dan'ana 3B.

  According to this invention, since the anchor block described above has a structure in which the flange plate and the shaft are divided into at least two parts, for the shaft, for example, an inexpensive round bar can be used as it is without much cutting, Further, the flange plate can be manufactured by punching or the like using a press using an inexpensive metal plate such as a rolled steel plate as it is. Therefore, according to the present invention, compared to the conventional configuration, the processing man-hours required for cutting the mounting surface of the flange to the backing plate, cutting the portion holding the brake shoe of the shaft, etc., can be greatly reduced, and the product yield can be reduced. Can greatly improve production costs.

  In this case, an effect can be obtained by forming the flange plate by progressive feeding using a fine blanking press.

  According to this progressive blanking press, a non-breaking, vertical and clean shear surface is secured, and dimensional tolerances are also kept to a minimum, so secondary processing required for cutting in subsequent processes is performed. Can be reduced. Accordingly, if an inexpensive metal plate such as a rolled steel plate is used for the flange plate, the flatness of the metal plate can be maintained with considerably high accuracy, and the man-hours for processing the flange plate can be greatly reduced. Therefore, for example, if an inexpensive round bar is used for the shaft without much cutting, it can contribute to a significant reduction in overall processing man-hours and a significant improvement in product yield compared to the conventional configuration. Manufacturing costs are greatly reduced.

Alternatively, the shaft may be press-fitted into the fitting hole of the flange plate and integrated by any one of caulking, laser arc welding, or projection resistance welding.
In general, if a shaft is press-fitted into the fitting hole of the flange plate, sufficient rigidity and strength as an anchor block can be secured, but for further strength compensation, the fitting portion is subjected to caulking, laser arc welding, Or if it integrates by either projection resistance welding, intensity | strength will fully increase. Moreover, it is possible to provide a product that can greatly reduce the overall processing man-hours and greatly improve the product yield.

  In a manufacturing method of an anchor block of a parking brake for a vehicle for supporting a brake shoe pressed against a drum when a parking brake is operated, a flange having a fitting hole penetrating the metal plate by punching the metal plate with a press A plate may be formed, a metal shaft that supports the brake shoe may be fitted into the fitting hole of the flange plate, and the shaft and the flange plate may be integrated.

  In this manufacturing method, since the anchor block described above has a structure of at least two parts of the flange plate and the shaft, first, for the shaft, for example, by using an inexpensive round bar as it is without much cutting, Reduction in processing man-hours and reduction in manufacturing costs. Next, the flange plate can be manufactured by punching with a press using an inexpensive metal plate such as a rolled steel plate as it is. Reduction of the manufacturing cost. Therefore, in the present invention, the processing man-hours required for cutting the mounting surface of the flange to the backing plate and cutting the portion holding the brake shoe of the shaft are greatly reduced, the product yield is greatly improved, and the manufacturing cost is reduced. It can be greatly reduced.

  In the present invention, since the anchor block has at least a two-part structure of the flange plate and the shaft, an inexpensive round bar, for example, is used as it is on the shaft without much cutting. If the metal plate is used as it is, and manufactured by punching with a press, etc., the processing required for cutting the mounting surface of the flange to the backing plate and cutting the part holding the brake shoe of the shaft, compared to the conventional one Man-hours can be greatly reduced, product yields can be greatly improved, and manufacturing costs can be greatly reduced.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of the invention will be described with reference to the accompanying drawings.
FIG. 1A shows a state before the assembly of the two anchor block parts, and FIG. 1B shows a state after the assembly. 2A shows a state in which two parts are welded, FIG. 2B shows a state in which the welded portion is viewed from below, and FIG. 2C shows a state in which an arrow B portion in FIG. 2A is enlarged.

  The anchor block 1 is composed of two parts, a flange plate 3 made of a metal plate and a shaft 5 made of a metal round bar. Although not shown, various types of parking brakes such as a leading / trailing brake are used. Has been applied. In this case, although not shown in the figure, the flange plate 3 of the anchor block 1 is fixed to the backing plate on the vehicle body side by, for example, two bolts, and a pair of brake shoes are held on the shaft 5 so as to be expandable. Thus, when the parking brake is operated, a pair of brake shoes expands with the shaft 5 as a fulcrum through the wire, and the brake shoes are pressed against the drum on the axle side to apply a braking force.

  An inexpensive metal round bar is used as the material of the shaft 5. The outer periphery of the metal round bar is machined. In FIG. 1, the medium diameter portion 5A, the large diameter portion 5B, the first small diameter portion 5C, and the second small diameter portion 5D slightly smaller in diameter are formed from the top to the bottom. Further, the third small diameter portion 5E having a smaller diameter is formed by cutting. 5F is a bolt hole. Since this cutting process is performed on the outer periphery of one metal round bar, the number of processing steps is reduced as compared with the prior art, and the material for the metal round bar is inexpensive, so that the manufacturing cost is greatly reduced.

  The flange plate 3 is manufactured by using an inexpensive metal plate such as a rolled steel plate, as will be described later, and subjected to a punching process by a press. A fitting hole 3A is formed by punching up and down the metal plate. Then, the shaft 5 is inserted into the fitting hole 3A of the flange plate 3 from above in FIG. 1, and the small diameter portion 5C of the shaft 5 is press-fitted into the fitting hole 3A of the flange plate 3 to be integrated. . In this case, as shown in FIG. 1B, the large-diameter portion 5B of the shaft 5 is press-fitted until it contacts the upper surface of the flange plate 3, and the second small-diameter portion 5D and the third small-diameter portion 5E protrude from the lower surface of the flange plate 3. . If the small diameter portion 5C of the shaft 5 is press-fitted into the fitting hole 3A of the flange plate 3, sufficient rigidity and strength as the anchor block 1 are ensured. In the present embodiment, as shown in FIG. 2, the press-fit portion is joined by laser arc welding or projection resistance welding for further strength compensation. As shown in FIG. 2C, a step hole 3B and an inclined hole 3C connecting the step hole 3B and the fitting hole 3A are formed on the side of the flange plate 3 where the fitting hole 3A is removed. It extends to the hole 3B and the inclined hole 3C.

  In the present embodiment, the flange plate 3 is formed by progressive feeding using a fine blanking press. In this process, the flange plate 3 can be finished at once by punching a metal plate such as a rolled steel plate with high accuracy, and a vertical and clean shear surface is ensured with a minimum dimensional tolerance. Therefore, secondary processing such as cutting or milling to the outer diameter or hole portion, which is necessary after normal pressing, can be reduced. In more detail, the normal press work is punching by a combination of a punch and a die, and when the punch descends and contacts and presses the material on the die, the material undergoes bending and deforms, Next, a fracture occurs through a shearing process, and punching is completed before the punch passes through the material. Therefore, “large burr and burr”, “many broken surfaces and few shear surfaces”, “the cut surface is not perpendicular to the material surface” “the flat surface of the extracted product is not flat and curved. In many cases, secondary processing is required. On the other hand, progressive feed processing by fine blanking press is a process of punching by controlling the material flow in the sheared part of the material to be punched, and it is high inside the material by a punch and die with extremely small clearance. A compressive stress is generated, the ductility of the material is increased to prevent cracking, and a vertical and beautiful shear surface without breakage is obtained.

  3 and 4 show a manufacturing apparatus used for progressive feeding by a fine blanking press. The manufacturing apparatus 50 includes an upper mold 51 and a lower mold 52, and a coil material 53 made of rolled steel sheet is fed between the molds 51 and 52 in the direction of arrow X. The upper mold 51 is a fixed mold, and the lower mold 52 is a mold that is guided by a guide post 60 and is movable in the vertical direction. The upper die 51 includes an upper backing plate 51A, an upper punch plate 51B that fixes each punch, and a stripper plate 51C that peels off the punched material from the punch. The lower die 52 includes a lower backing plate 52A and a lower punch It comprises a plate 52B and a die plate 52C that performs product processing.

  An inlet material guide 54 for guiding the coil material 53 and feeding it into the mold is attached to the front end of the stripper plate 51C of the upper mold 51, and an outlet material guide 55 for guiding and feeding the coil material 53 to the rear end. It is attached. Further, the upper punch plate 51B is fixed with piercing punches 56 to 58 for piercing holes, a stepped punch 59 for providing a step, and a main punch 61 for punching an outer shape. A pilot 75 in the main punch is provided for prevention. Reference numeral 62 denotes a stripper pressure pin that applies pressure to the plate presser.

  On the lower punch plate 52B of the lower die 52, ejector punches 63 and 64 for pushing out the punched scrap, crushed pilots 65 and 66, and a reverse presser 67 for pushing out the punched product are attached. The lower backing plate 52A is provided with peer pressure pins 68 and 69 that apply pressure to the ejector punches 63 and 64, and counter pressure pins 70 that apply pressure to the main punch 61. Reference numerals 71 to 74 denote mounting bolts.

  As shown in FIG. 5, the flange plate 3 is formed by the above-described punching through the first to fifth steps. 4 and 5, in the first step, the lower mold 52 moves upward, and the coil material 53 made of rolled steel sheet fed into the mold has two types of piercing punches 56 and 57 having different diameters. (See FIG. 3) is driven, and each pierce hole 81, 82 is punched. The pair of piercing holes 81 correspond to the mounting holes of the flange plate 3 with reference to FIG. In the above process, since the coil material 53 is processed in a state of being substantially restrained by the upper mold 51, unevenness and burrs are not generated on the removal side. In the second step, after the coil material 53 is fed for one step, the crushed pilot 65 is inserted into the pierced hole 81, and another pilot (not shown) is inserted into the pierced hole 82. Are positioned with high precision, and then a stepped hole 83 is formed by a stepped punch 59 that forms a step. The step hole 83 corresponds to the step hole 3B with reference to FIG.

  In the third step, the coil material 53 is further fed for one step, and a crushed pilot (not shown) is inserted into each of the pierce holes 81 and 82 to determine the position of the coil material 53, and then the coil material 53. Further, the piercing hole (the fitting hole 3A) is punched out by the piercing punch 58 so as to coincide with the stepped hole 83. Even in this step, since the upper surface of the coil material 53 is processed in a state of being substantially restrained by the upper mold 51, unevenness and burrs do not occur on the removal side. In the fourth step, a crushed pilot (not shown) is inserted into the pierced hole 81, and a crushed pilot 66 is inserted into the pierced hole (fitting hole 3A). In the state where is guided, the hole burr generated in the piercing hole (the fitting hole 3A) is crushed. In the fifth step, a pilot (not shown) is inserted into the piercing hole (fitting hole 3 </ b> A), and the outer shape of the product is punched out by the main punch 61 while pressing the material by the pilot 75 in the main punch of the main punch 61. At this stage, a step 84 is applied to the pierce hole 81, and this step 84 corresponds to a counterbore hole with reference to FIG.

  In this embodiment, since the anchor block 1 has at least a two-part structure of the flange plate 3 and the shaft 5, for example, an inexpensive round bar can be used for the shaft 5, and an inexpensive, for example, rolled steel plate or the like can be used for the flange plate. These metal plates can be used as they are, and can be manufactured by punching using a press. Therefore, in this configuration, compared to the conventional configuration, the processing man-hours required for cutting the mounting surface of the flange to the backing plate and cutting the part holding the brake shoe of the shaft are greatly reduced, and the product yield is greatly increased. Can improve and greatly reduce manufacturing costs. In addition, since the flange plate 3 is formed by the progressive feed processing using the fine blanking press described above, a vertical and clean shear surface is ensured without breaking, and a dimensional tolerance is also kept to a minimum. Can be reduced. Therefore, if a metal plate having a high flatness such as a rolled steel plate is used, the man-hours for processing the flange plate can be greatly reduced, and the yield can be improved and the manufacturing cost can be greatly reduced. If the shaft 5 is press-fitted into the fitting hole 3A of the flange plate 3 and then the fitting portion is integrated by any one of caulking, laser arc welding, or projection resistance welding, further strength compensation can be achieved. Significant reduction in processing man-hours.

  6 and 7 show another embodiment. Each figure corresponds to FIG. 1 and FIG. 2 respectively, and the same parts are denoted by the same reference numerals. The feature of this configuration is that the press-fitting portion is welded while the press-fitting portion is welded in FIGS. 1 and 2. In caulking, referring to FIG. 6A, the first small diameter portion 5C of the shaft 5 is formed longer than that of FIG. 1, and after the small diameter portion 5C of the shaft 5 is press-fitted into the fitting hole 3A of the flange plate 3, A caulking 6 is applied to a portion 91 of the first small-diameter portion 5C protruding below the fitting hole 3A, and the small-diameter portion 5C of the shaft 5 is coupled to the fitting hole 3A of the flange plate 3. Even in this embodiment, similar to the above welding, further strength compensation can be achieved, and the number of processing steps can be greatly reduced.

  As mentioned above, although this invention was demonstrated based on one Embodiment, this invention is not limited to this. For example, the manufacturing means of the flange plate 3 is not limited to the progressive feed processing by the fine blanking press described above, and may be general press molding such as cold press or hot press. Although the metal round bar was used for the shaft, it is not limited to this, For example, cold forging and a header are possible.

A is an exploded view showing an anchor block, and B is an assembled view thereof. A is an assembled view showing an anchor block, B is a view showing a welded portion, and C is an enlarged view showing the welded portion. It is sectional drawing of the manufacturing apparatus for fine blanking processes. It is also a plan view. A is a top view which shows a manufacturing process, B is the sectional drawing. A is an exploded view showing an anchor block, and B is an assembled view thereof. FIG. 3A is an assembled view showing an anchor block, FIG. 2B is a view showing a caulking portion, and C is an enlarged view showing the caulking portion.

Explanation of symbols

1 Anchor block 3 Flange plate 3A Fitting hole 5 Shaft

Claims (2)

In the vehicle parking brake anchor block for holding the brake shoe pressed against the drum when the parking brake is operated,
Formed by punching a metal plate by progressive feed processing with a fine blanking press, the flange plate having a fitting hole penetrating the metal plate, and fitted into the fitting hole of the flange plate to hold the brake shoe It consists of at least two parts with a metal shaft, and this shaft is formed with at least a large diameter portion 5B, a first small diameter portion 5C, and a second small diameter portion 5D having a smaller diameter than that, and a side of the flange plate where the fitting hole is removed The step hole 3B and the inclined hole 3C that connects the step hole 3B and the fitting hole 3A are formed in the process of the progressive feeding, and the first small diameter portion 5C of the shaft is press-fitted into the fitting hole, thereby forming the step hole 3B. Further, the flange plate and the shaft are integrated by extending the first small diameter portion 5C and the second small diameter portion 5D in the inclined hole 3C and performing welding over the step hole 3B and the inclined hole 3C. The anchor block of the vehicle parking brake, characterized in that. In the vehicle parking brake anchor block for holding the brake shoe pressed against the drum when the parking brake is operated,
Formed by punching a metal plate by progressive feed processing with a fine blanking press, the flange plate having a fitting hole penetrating the metal plate, and fitted into the fitting hole of the flange plate to hold the brake shoe It consists of at least two parts with a metal shaft, and this shaft is formed with at least a large diameter portion 5B, a first small diameter portion 5C, and a second small diameter portion 5D having a smaller diameter than that, and a side of the flange plate where the fitting hole is removed In this process, the step hole 3B is formed in the process of progressive feeding, the first small diameter portion 5C of the shaft is press-fitted into the fitting hole, and the portion 91 of the first small diameter portion 5C protruding outside the step hole 3B is caulked. alms, anchor blocks of a vehicle parking brake, characterized in that integrated flange plate and the shaft by coupling met with the caulking portion Dan'ana 3B .

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