JP2015148329A - Ring mold type boot and manufacturing method of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ring mold type boot which prevents the occurrence of cutouts, to reduce exposed portions of a ring and improve rust prevention effect.SOLUTION: A ring mold type boot includes: an elastic body 2 including an inner peripheral end part 9 attached to a movable body and an outer peripheral end part 4 contacting with a fixed body in a sealable manner; and a metal ring 3 which is molded in the outer peripheral end part of the elastic body. Multiple first protruding parts 5 for supporting the ring at a home position during molding are provided in the ring so as to protrude in an axial direction of the ring. Further, multiple second protruding parts 6, which face a mold spaced away from the mold during the molding, are provided at the ring so as to protrude in a circumferential direction of the ring.

Description

  The present invention relates to a ring mold type boot in which a metal ring is molded integrally with an elastic body and a method for manufacturing the same.

  Conventionally, this type of boot has been disclosed in Japanese Patent Application Laid-Open No. 2002-327849 (Patent Document 1) and Japanese Patent Application Laid-Open No. 2009-19643 (Patent Document 2). In order to arrange the metal ring at a fixed position in the mold, these are provided with a plurality of pedestals placed on the mold and supported by the metal ring.

JP 2002-327849 A JP 2009-19643 A

  In the product disclosed in the above-mentioned patent document, a notch remains in the mark where the pedestal is located, and a part of the metal ring is exposed through the notch, and has a drawback that it is easily rusted.

  Further, the manufacturing method has a problem that the mold is complicated because a plurality of pedestals for supporting the metal ring in the inner or outer diameter and the axial direction must be provided on the circumference.

(Object of invention)
A first object of the present invention is to provide a ring mold type boot that can eliminate notches, reduce the exposed portion of the ring, and enhance the rust prevention effect.
A second object of the present invention is to provide a method for manufacturing a ring mold boot that can simplify the mold and reduce the cost.

  In order to achieve the first object, a ring mold type boot of the present invention includes an inner peripheral end attached to a movable body and an outer peripheral end that sealably contacts the fixed body, and the elastic body. A ring mold type boot having a metal ring molded in an outer peripheral end of the ring, wherein the ring has a first convex portion for supporting at a fixed position at the time of molding. A plurality of second protrusions are provided so as to protrude in the direction of the ring, and a plurality of second protrusions are provided so as to protrude in the circumferential direction of the ring. To do.

  In order to achieve the second object, the method of manufacturing the ring mold boot of the present invention includes disposing a metal ring in the mold cavity and injecting an elastic material into the cavity. A ring mold type boot manufacturing method in which the ring is integrally molded with an elastic body, wherein a plurality of first protrusions provided so as to protrude in the axial direction of the ring are in a fixed position with respect to the mold. A plurality of second protrusions that are supported and project in the circumferential direction of the ring are opposed to the mold with a gap.

  According to the present invention, it is possible to eliminate the notch and reduce the exposed portion of the ring, thereby enhancing the rust prevention effect. Further, the mold can be simplified and the cost can be reduced.

It is sectional drawing of the Example which concerns on the product of this invention. It is a perspective view which shows the shape of the ring in an Example. It is sectional drawing which shows the mounting state of an Example. It is sectional drawing which shows the mold type | mold in the Example which concerns on the manufacturing method of this invention.

  The mode for carrying out the present invention is as described in the following examples.

  FIG. 1 is a cross-sectional view showing a ring mold type boot which is an embodiment of a product according to the present invention, and FIG. 2 is a perspective view showing only a metal ring.

  In FIG. 1, a ring mold type boot 1 is formed in an annular shape by an elastic body 2 having an inner peripheral end attached to a moving body and an outer peripheral end contacting a fixed body in a sealable manner and a metal ring 3. Has been. The ring 3 is a metal material inevitable to rust as shown in FIG. 2, and is formed in an annular shape as shown in FIG. The ring 3 is molded in the outer peripheral end 4 of the elastic body 2. The cross section of the ring 2 in FIG. 1 is a cross section taken along the line AA in FIG.

  The ring 3 is provided with a plurality of first projections 5 at equal intervals so as to protrude in the axial direction of the ring 3 for supporting at a fixed position during molding. In addition, a plurality of second convex portions 6 that face the mold die with a gap at the time of molding are provided at equal intervals so as to protrude toward the inner peripheral side of the ring 3 in the circumferential direction. In FIG. 2, the second convex portion 6 is positioned in the middle of the interval between the first convex portions 5, but the first convex portion 5 and the second convex portion 6 are aligned in the circumferential direction. It may be made to become. In FIG. 2, the 1st convex part 5 and the 2nd convex part 6 are formed by press work.

  The outer peripheral end 4 of the elastic body 2 has two seal portions 7 and 8. The inner peripheral end 9 of the elastic body 3 has a sealing property.

  The ring mold type boot 1 is used, for example, as a dust boot disposed between a piston that is a moving body of a movable caliper type disk brake for a vehicle and a cylinder body that is a fixed body. FIG. 3 is a cross-sectional view showing a mounted state.

  In FIG. 3, a piston 40 is slidably disposed in the cylinder hole 31 of the cylinder body 30 in the axial direction. A piston seal 50 is provided to seal the hydraulic fluid from leaking from the sliding surfaces of the cylinder hole 31 and the piston 40. A ring mold type boot 1 is attached between the cylinder body 30 and the piston 40. The inner peripheral end 9 is assembled in an annular groove 41 formed on the outer periphery of the piston 40 so as to be sealed by fitting pressure contact. The outer peripheral end 4 is assembled to an annular opening step 32 formed in the cylinder body 30 by fitting. The seal portion 7 is in pressure contact with the side surface of the annular opening step portion 32, and the seal portion 8 is in pressure contact with the bottom surface of the annular opening step portion 32. Therefore, foreign matter such as dust and moisture can be prevented from entering the sliding surfaces of the cylinder hole 31 and the piston 40 from the outside.

  According to the product described in FIGS. 1-3, since the notch is eliminated, the exposed surface of the ring 3 after molding can be reduced, and rusting can be prevented. Further, if the tip shapes of the convex portions 5 and 6 are linear, dot-like, arc-like, etc., the exposed surface of the ring 3 can be further reduced.

  Next, an embodiment of a method for manufacturing a ring mold type boot according to the present invention will be described with reference to FIG. The mold 100 includes a lower mold 101, an upper mold 102, and a middle mold 103. The lower mold 101, the upper mold 102, and the middle mold 103 have a molding surface that forms a cavity 104 having the same shape as the shape of the ring mold boot 1 in a natural state in a combined state, and can be joined and separated. Has been. The upper mold 102 is provided with a plurality of injection ports 105 for injecting an elastic material. When the ring 3 is disposed in the cavity 104 at the time of molding, the first convex portion 5 of the ring 3 is supported at a fixed position on the seat surface 106 of the middle mold 103. The second convex portion 6 faces the outer peripheral surface 107 of the lower mold 101 with a slight gap therebetween. Or some 2nd convex part 6 may contact the outer peripheral surface 107. FIG. In this way, the first convex portion 5 and the second convex portion 6 position the ring 3 in the cavity 104. During molding, an elastic material melted from the injection port 105 is injected into the cavity 104. After the elastic body 2 is cured, the lower mold 101, the upper mold 102, and the middle mold 103 are removed, and unnecessary portions (portions of the injection port 105) are removed and finished.

  According to this manufacturing method, since a dedicated base portion for supporting the ring 3 is not required for the mold 100, the mold can be simplified and the cost can be reduced. Further, the first convex portion 5 and the second convex portion 6 can minimize the positional deviation of the ring 3 in the mold 100.

(Modification)
The first convex portion and the second convex portion are not limited to the illustrated example, and can be set to any shape, number, and position. For example, it is possible to bond a separately produced convex portion to the cylindrical surface of the ring by welding or the like instead of a shape punched or bent by a press. Moreover, you may make it the 2nd convex part 6 protrude on the outer peripheral side. The ring mold type boot according to the present invention can also be used for a pin boot disposed between a caliper and a slide guide pin in a pin slide mechanism of a movable caliper type disc brake device for a vehicle.

DESCRIPTION OF SYMBOLS 1 Ring mold type | mold boot 2 Elastic body 3 Ring 4 Outer peripheral edge part 5 1st convex part 6 2nd convex part 9 Inner peripheral edge part 30 Cylinder body 40 Piston 100 Mold type 104 Cavity

Claims (3)

An elastic body having an inner peripheral end attached to the movable body and an outer peripheral end contacting the fixed body in a sealable manner;
A ring mold type boot having a metal ring molded in an outer peripheral end of the elastic body,
The ring is provided with a plurality of first convex portions for supporting in a fixed position at the time of molding so as to protrude in the axial direction of the ring, and faces the mold die with a gap at the time of molding. A ring mold type boot, wherein a plurality of second convex portions are provided so as to protrude in a circumferential direction of the ring.   The ring mold type boot, wherein the second convex portion is provided on an outer peripheral side or an inner peripheral side of the ring. A ring mold boot manufacturing method in which a metal ring is disposed in a cavity of a mold, an elastic material is injected into the cavity, and the ring is molded integrally with the elastic body,
Support at a fixed position with respect to the mold by a plurality of first protrusions provided so as to protrude in the axial direction of the ring,
A method for manufacturing a ring mold boot, characterized in that a plurality of second protrusions provided so as to protrude in the circumferential direction of the ring are opposed to the mold mold with a gap.

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