JP6502082B2 - Tire mold and rubber stop valve - Google Patents

Description

  The present invention relates to a tire mold including a plurality of molds forming a molding chamber for molding a tire. The present invention also relates to a rubber stop valve that suppresses the ingress of rubber.

  DESCRIPTION OF RELATED ART Conventionally, the tire mold provided with the some mold which comprises the molding chamber for shape | molding a tire as a tire mold is known. The mold includes a vent hole communicating the inside and the outside of the molding chamber, and an on-off valve disposed in the vent hole, in order to discharge the gas in the molding chamber. The on-off valve includes a valve seat having an inflow hole into which the gas in the molding chamber flows, and a valve body contacting the valve seat so as to completely close the inflow hole (for example, Patent Documents 1 and 2) .

  First, at the initial stage of tire molding, the valve body is separated from the valve seat, whereby the inflow hole is opened, and the air in the molding chamber is discharged from the vent hole. Thereafter, at the late stage of tire molding, the air pressure in the molding chamber is lowered by the rubber approaching the inflow hole, and the inflow hole is completely blocked by the valve body coming into contact with the valve seat.

  By the way, when the timing of closing the inflow hole is late, the rubber intrudes into the inflow hole, and rubber biting occurs between the valve body and the valve seat. In addition, when the timing of closing the inflow hole is early, a gas accumulation occurs in the molding chamber, so that a rubber defect resulting from it occurs in the molded tire.

JP 2001-205638 A JP, 2010-280171, A

  Therefore, in view of such circumstances, the present invention suppresses the occurrence of rubber biting between the valve body and the valve seat, and further suppresses the occurrence of rubber defects in the tire and a tire mold and rubber It is an issue to provide a stop valve.

  The tire mold according to the present invention includes a plurality of molds that form a molding chamber for molding a tire, and the mold communicates with the inside and the outside of the molding chamber in order to discharge the gas in the molding chamber. And a rubber stop valve disposed in the vent hole and suppressing entry of rubber, wherein the rubber stop valve has a valve seat having an inflow hole into which gas in the molding chamber flows, and rubber In order to suppress entry, a valve body which contacts the valve seat so as to cover the inflow hole, an urging body which brings the valve body into pressure contact with the valve seat, and a gas which has flowed in from the inflow hole And a circulation portion that flows toward the downstream side of the vent hole, and at least one of the valve seat and the valve body is formed between the valve seat and the valve body, with a part of the circulation portion. And at least the convex and the concave Equipped with a person.

  In the tire mold, the rubber stop valve may be configured to include a restricting portion that restricts the valve body from moving away from the valve seat by stopping the valve body.

  Further, in the tire mold, the valve body and the restricting portion are provided with abutting surfaces that abut each other, a part of the flow-through portion is formed between the abutting surfaces, and the abutting surfaces are mutually It may be configured to be planar, respectively, so that the flow of the gas in the flow part is blocked by the contact.

  Further, the rubber stop valve is disposed inside a vent hole communicating the inside and the outside of the molding chamber for molding the tire, and the rubber stop valve for suppressing the entry of rubber into the vent hole is a gas in the molding chamber. A valve seat having an inflow hole into which the gas flows, a valve body which contacts the valve seat so as to cover the inflow hole, an urging body which brings the valve body into pressure contact with the valve seat, and an inflow from the inflow hole A flowing portion in which the flowed gas flows toward the downstream side of the vent hole, and at least one of the valve seat and the valve body has a portion of the flowing portion between the valve seat and the valve body It is characterized in that it comprises at least one of a protrusion and a recess to be formed.

  As described above, the present invention has the excellent effect of suppressing the occurrence of rubber defects in the tire and further suppressing the occurrence of rubber biting between the valve body and the valve seat.

FIG. 1 is a cross-sectional view of an essential part of a tire mold according to an embodiment. FIG. 2 is an overall cross-sectional view of the rubber stop valve according to the same embodiment. FIG. 3 is an enlarged view of a III region of FIG. FIG. 4 is a perspective view of the main part of the valve according to the embodiment. FIG. 5 is a bottom view of the valve according to the embodiment. FIG. 6 is a cross-sectional view of an essential part of a rubber stop valve according to another embodiment. FIG. 7 is a cross-sectional view of an essential part of a rubber stop valve according to still another embodiment. FIG. 8 is an overall cross-sectional view of a rubber stop valve according to still another embodiment.

  Hereinafter, one embodiment in a tire mold and a rubber stop valve is described with reference to FIGS. 1 to 5. In addition, in each figure (FIGS. 6-8 is also the same), the dimension ratio of drawing and the actual dimension ratio do not necessarily correspond.

  As shown in FIG. 1, the tire mold 1 according to the present embodiment includes a plurality of molds 2 in which a molding chamber 1a for molding a tire is constituted by an internal space. Specifically, the tire mold 1 includes a pair of side molds 2a and 2b for forming the sidewall portion of the tire, and a plurality of tread molds 2c for forming the tread portion of the tire.

  In the present embodiment, the tire mold 1 is a tire vulcanizing mold. In FIG. 1, an unvulcanized tire is set in a molding chamber 1 a inside the plurality of molds 2 with the tire axis in the vertical direction. That is, in FIG. 1, the vertical direction is the tire width direction, and the horizontal direction is the tire radial direction.

  The tread mold 2c is divided into a plurality of parts (for example, 7 or 11) in the circumferential direction of the tire and formed in parallel along the circumferential direction of the tire. The lengths in the tire circumferential direction of each tread mold 2c may be the same or different. Also, the number of divisions of the tread mold 2c is not particularly limited.

  The mold 2 is provided on its inner surface with a molding surface 21 in contact with the tire set in the molding chamber 1a. Further, the mold 2 is a vent hole communicating the inside and the outside of the molding chamber 1a in order to discharge the gas (for example, air) in the molding chamber 1a, specifically, between the tire and the molding surface 21 at the time of tire molding. It has multiple 31s.

  Although one vent hole 31 is illustrated in each mold 2 in FIG. 1, the number of vent holes 31 is not particularly limited. The plurality of vent holes 31 may be arranged in parallel at intervals in the tire circumferential direction, and may not be disposed on the same tire meridian cross section.

  The vent hole 31 includes a vent inlet 31a into which the gas in the molding chamber 1a flows, and a vent outlet 31b from which the gas flowing from the vent inlet 31a flows out of the molding chamber 1a. The gas in the molding chamber 1a passes through the vent hole 31 and is flowed out of the molding chamber 1a as a suction device (not shown) such as a vacuum pump sucks in the molding chamber 1a. .

  The terms "upstream" and "downstream" used below are defined based on the direction in which the gas discharged from the inside of the molding chamber 1a flows inside the vent hole 31. Therefore, the vent inlet 31 a is the upstream end of the vent hole 31, and the vent outlet 31 b is the downstream end of the vent hole 31.

  The tire mold 1 according to the present embodiment is a so-called segmented mold. When the molds are opened, the side molds 2a and 2b separate from each other, and the tread molds 2c are displaced outward in the tire radial direction so as to spread radially, so that the insertion and removal of the tire becomes possible.

  At the time of mold clamping, the tread molds 2c are closely gathered and connected, whereby the tread molds 2c form a continuous annular ring, and the side molds 2a and 2b approach each other. As a result, the molding surface 21 of each mold 2 can be in close contact with the outer surface of the tire.

  As shown in FIGS. 2 and 3, the mold 2 includes a mold main body 3 having a vent hole 31, and a rubber stop valve 4 disposed in the vent hole 31 and suppressing entry of rubber. The rubber stop valve 4 is fixed to the vent inlet 31 a of the vent hole 31. The molding surface 21 of the mold 2 is constituted by the mold main body 3 and the rubber stop valve 4.

  The rubber stop valve 4 has a valve seat 5 having an inflow hole 51 into which the gas in the molding chamber 1 flows, and a valve body that contacts the valve seat 5 so as to cover the inflow hole 51 in order to suppress intrusion of rubber. It is equipped with six. Further, the rubber stop valve 4 includes an urging body 7 that brings the valve body 6 into pressure contact with the valve seat 5 and a case body 8 that accommodates the valve body 6 and the urging body 7.

  The valve seat 5 is formed in a cylindrical shape so as to form the inflow hole 51 inside. The surface on the upstream side (lower side in FIG. 2) of the valve seat 5 constitutes the molding surface 21 of the mold 2. Also, the valve seat 5 is provided with a valve seat surface 52 in contact with the valve body 6 on the downstream side (the upper side in FIG. 2).

  The inflow hole 51 has a circular upstream opening 51a opened to the molding surface 21 of the mold 2 (a surface on the upstream side of the valve seat 5), and a reduced diameter portion 51b reduced in diameter toward the downstream side from the upstream opening 51a. Is equipped. Further, the inflow hole 51 has a same diameter portion 51c extending in the same diameter toward the downstream side from the reduced diameter portion 51b, and a circular downstream opening opened to the valve seat surface 52 (surface on the downstream side of the valve seat 5). And 51 d.

  The valve body 6 includes a valve body portion 61 in contact with the valve seat 5 and a base portion 62 formed to have a smaller diameter than the valve body portion 61. The valve body 61 is formed to cover the downstream opening 51 d. Specifically, the valve body portion 61 is formed in a cylindrical shape, and the outer diameter of the valve body portion 61 is larger than the inner diameter of the downstream opening 51 d. Further, the valve body portion 61 is provided with a valve body surface 61 a in contact with the valve seat surface 52 of the valve seat 5 on the upstream side surface.

  The case body 8 is formed in a tubular shape, and accommodates the valve body 6 and the biasing body 7 therein. The case body 8 is provided on the downstream side with a support portion 81 projecting radially inward to support the biasing body 7. Further, the case body 8 is provided at the downstream side with an outflow hole 82 through which the gas flowing into the rubber stop valve 4 from the inflow hole 51 flows out to the outside of the rubber stop valve 4.

  The biasing body 7 is an elastic body. In the present embodiment, the biasing body 7 is a spring. Then, the biasing body 7 is disposed between the valve body 6 and the case body 8 in a state of being elastically deformed so as to contract, thereby biasing the valve body 6 into pressure contact with the valve seat 5. There is. The upstream end of the biasing body 7 is in contact with the downstream surface of the valve body 61, and the downstream end of the biasing body 7 is in contact with the support 81 of the case body 8. I am in touch.

  The biasing body 7 has a biasing force such that the valve body 6 is not separated from the valve seat 5 at the time of tire molding (the entire period in which the inside of the molding chamber 1a is sucked). For example, in the case where the inside of the molding chamber 1a is sucked with a suction force of 80 to 100 kPa by the vent hole 31, the pressing force at no load by the biasing body 7 is 1.3 of the suction force in the molding chamber 1a. It is preferable that it is -1.7 times.

  By the way, the rubber stop valve 4 is provided with the flow part 9 which the gas which flowed in from the inflow hole 51 distribute | circulates toward the downstream of the vent hole 31 to the outflow hole 82. As shown in FIG. The flow passage portion 9 includes an inflow hole 51, a first flow passage portion 91 formed between the valve seat 5 and the valve body 6, and a second flow passage portion formed between the valve body 6 and the case body 8. 92 and an outlet 82a.

  As shown in FIGS. 3 to 5, the valve body 6 includes a plurality of recesses 61 b in the valve body surface 61 a of the valve body portion 61. Specifically, the valve body 6 is provided with a groove-like recess 61 b extending from the valve body surface 61 a of the valve body 61 to the side peripheral surface 61 c. In the present embodiment, the recess 61 b extends radially from the center of the valve body surface 61 a. The number and shape of the recesses 61b are not particularly limited.

  And since valve element 6 is provided with crevice 61b, between valve seat 5 and valve element 6, a part of distribution part 9 is formed. Specifically, a first flow passage portion 91 is formed between the valve seat surface 52 of the valve seat 5 and the valve body surface 61 a of the valve body 6. In addition, the recess 61 b is configured to be capable of circulating gas and capable of preventing intrusion of rubber (flow).

  The width dimension of the recess 61 b is smaller than the width dimension of the inflow hole 51 (specifically, the downstream opening 51 d). And it is preferable that the width dimension of the recessed part 61b is 0.04 mm-0.05 mm. Moreover, it is preferable that the depth dimension of the recessed part 61b is 0.04 mm-0.05 mm.

  Further, the case body 8 includes a restricting portion 83 which restricts the valve body 6 from moving away from the valve seat 5 by stopping the valve body 6. The restricting portion 83 is configured to be able to abut on the valve body 6 by projecting radially inward. And the valve body 6 and the control part 83 are provided with the contact surfaces 61d and 83a which mutually contact | abut.

  The contact surface 61 d of the valve body 6 is disposed on the downstream surface of the valve body 61, and the contact surface 83 a of the restricting portion 83 is disposed on the upstream surface of the restricting portion 83. The contact surfaces 61d and 83a are disposed to face each other, and between the contact surfaces 61d and 83a, a part of the circulation portion 9 (specifically, the second flow passage portion 92) Is formed.

  In addition, the contact surfaces 61d and 83a are each formed in a planar shape. Thereby, for example, when the valve body 6 separates from the valve seat 5 due to a decrease in the biasing force of the biasing body 7 or the like, the abutting surfaces 61d and 83a abut each other to form the flow part 9 (2) blocking the flow of gas in the flow path section 92). Thereby, the rubber stop valve 4 stops the suction in the molding chamber 1 a performed through the vent hole 31.

  As mentioned above, the tire mold 1 which concerns on this embodiment is provided with several mold 2 which comprises the molding chamber 1a for shape | molding a tire, The said mold 2 is in order to discharge | emit the gas in the said molding chamber 1a. A vent hole 31 communicating the inside and outside of the molding chamber 1a; and a rubber stop valve 4 disposed in the vent hole 31 for suppressing intrusion of rubber, the rubber stop valve 4 being the molding chamber A valve seat 5 having an inflow hole 51 into which the gas in the space 1a flows, a valve body 6 contacting the valve seat 5 so as to cover the inflow hole 51 in order to suppress the entry of rubber, the valve body The valve seat 5 includes: an urging body 7 for bringing the valve seat 5 into pressure contact with the valve seat 5; and a circulating portion 9 in which gas flowing from the inflow hole 51 circulates toward the downstream side of the vent hole 31 And at least one of the valve body 6 (specific In the valve body 6), at least one of the convex portion and the concave portion (specifically, the concave portion 61b) so that a part of the flow passage portion 9 is formed between the valve seat 5 and the valve body 6 Equipped with

  According to such a configuration, when the biasing body 7 brings the valve body 6 into pressure contact with the valve seat 5, the valve body 6 covers the inflow hole 51 into which the gas in the molding chamber 1a flows. Therefore, the valve body 6 can suppress the entry of rubber, and therefore, the occurrence of the rubber biting between the valve body 6 and the valve seat 5 can be suppressed.

  At this time, at least one of the valve seat 5 and the valve body 6 (specifically, the valve body 6) is provided with at least one of the convex portion and the concave portion (specifically, the concave portion 61b). A part of the flow part 9 is formed between the valve body 6 and the valve body 6. Thus, even when the valve body 6 is in contact with the valve seat 5, the gas flowing from the inflow hole 51 passes between the valve seat 5 and the valve body 6 and circulates toward the downstream side of the vent hole 31. Therefore, the occurrence of gas accumulation in the molding chamber 1a can be suppressed. Therefore, it can suppress that the rubber | gum defect of a tire generate | occur | produces.

  Further, in the tire mold 1 according to the present embodiment, the rubber stop valve 4 includes a restricting portion 83 that restricts the valve body 6 from coming away from the valve seat 5 by stopping the valve body 6. , Is a configuration.

  According to such a configuration, when the restricting portion 83 stops the valve body 6, it is possible to restrict the valve body 6 from separating from the valve seat 5. As a result, it is possible to suppress the intrusion of a large amount of rubber between the valve body 6 and the valve seat 5, thereby suppressing the occurrence of a large amount of rubber biting between the valve body 6 and the valve seat 5. be able to.

  Further, in the tire mold 1 according to the present embodiment, the valve body 6 and the regulation portion 83 include abutment surfaces 61d and 83a that abut each other, and a part of the circulation portion 9 is the abutment surface 61d. , 83a, and the contact surfaces 61d, 83a are formed in a planar shape so that the flow of the gas in the flow section 9 is blocked by contacting each other. .

  According to such a configuration, the contact surfaces 61d and 83a of the valve body 6 and the restricting portion 83 are each formed in a planar shape, and a part of the circulation portion 9 is formed between the contact surfaces 61d and 83a. Is formed. Then, when the valve body 6 separates from the valve seat 5, the contact surfaces 61d and 83a abut each other, thereby blocking the flow of gas in the flow portion 9. As a result, suction in the molding chamber 1a is stopped, so that rubber can be prevented from entering between the valve body 6 and the valve seat 5. Therefore, occurrence of rubber biting between the valve body 6 and the valve seat 5 can be suppressed.

  In addition, a tire mold is not limited to the structure of embodiment mentioned above, Moreover, it is not limited to the effect mentioned above. Further, it goes without saying that various modifications can be made to the tire mold without departing from the scope of the present invention. For example, as a matter of course, configurations, methods, and the like according to various modifications described below may be arbitrarily selected and adopted as the configurations, methods, and the like according to the above-described embodiment.

  In the tire mold 1 according to the above-described embodiment, the valve body 6 is configured to include the recess 61 b so that a part of the flow passage 9 is formed between the valve seat 5 and the valve body 6. However, the tire mold is not limited to such a configuration.

  For example, as shown in FIG. 6, the valve body 6 may be configured to have a convex portion 61 e so that a part of the flow passage portion 9 is formed between the valve seat 5 and the valve body 6. For example, as shown in FIG. 7, the valve seat 5 may be configured to have a recess 53 so that a part of the flow passage 9 is formed between the valve seat 5 and the valve body 6. Further, for example, the valve seat 5 may be configured to have a convex portion so that a part of the flow passage 9 is formed between the valve seat 5 and the valve body 6. Furthermore, the tire mold may have a configuration in which a plurality of these configurations are combined.

  Further, in the tire mold 1 according to the above-described embodiment, the valve body 6 is configured to include a groove-shaped recessed portion 61 b extending from the valve body surface 61 a of the valve body 61 to the side peripheral surface 61 c. However, the tire mold is not limited to such a configuration. For example, in the tire mold 1, the valve body 6 may have a groove-like recess 61 b extending only over the valve body surface 61 a of the valve body 61.

  Further, in the tire mold 1 according to the above-described embodiment, the upstream end portion of the biasing body 7 is in contact with the downstream surface of the valve body portion 61. However, the tire mold is not limited to such a configuration. For example, in the tire mold, as shown in FIG. 8, the upstream end of the biasing body 7 may be in contact with the downstream surface of the base 62 of the valve body 6. The biasing body 7 may be not only a spring but also a rubber having elasticity.

  Further, the tire mold 1 according to the above-described embodiment has a configuration in which the regulating portion 83 is provided. However, the tire mold is not limited to such a configuration. For example, the tire mold may have a configuration in which the regulating portion 83 is not provided.

  Further, in the tire mold 1 according to the above-described embodiment, the circulating portion 9 is formed between the contact surface 61 d of the valve body 6 and the contact surface 83 a of the regulating portion 83. However, the tire mold is not limited to such a configuration. For example, in the tire mold, the circulating portion 9 may not be formed between the contact surface 61 d of the valve body 6 and the contact surface 83 a of the regulating portion 83.

  Moreover, in the tire mold 1 which concerns on the said embodiment, it is a structure that the mold main body 3, the valve seat 5, and the case body 8 are another members, respectively. However, the tire mold is not limited to such a configuration. For example, in the tire mold, a part or all of the mold main body 3, the valve seat 5, and the case body 8 may be configured to be the same separate members as the other configurations. For example, the mold body 3 and the valve seat 5 may be one member, the mold body 3 and the case body 8 may be one member, and the valve seat 5 and the case body 8 may be one member.

  Moreover, in the tire mold 1 which concerns on the said embodiment, the valve body part 61 is the structure of being formed in the column shape. However, the tire mold is not limited to such a configuration. For example, in the tire mold, the valve body portion 61 may be formed in a truncated cone shape whose diameter decreases from the upstream side to the downstream side.

  The tire mold 1 according to the above-described embodiment is a so-called segmented mold including the side molds 2a and 2b and the tread mold 2c. However, the tire mold is not limited to such a configuration. For example, the tire mold may be a so-called two-piece mold including a pair of molds divided into two in the tire width direction.

  Further, in the tire mold 1 according to the above-described embodiment, the urging body 7 is an urging force that prevents the valve body 6 from being separated from the valve seat 5 at the time of tire molding (the entire period when the inside of the molding chamber 1a is sucked). Is configured to have However, the tire mold is not limited to such a configuration. For example, in a tire mold, the biasing body 7 has a biasing force to move the valve body 6 away from the valve seat 5 at the initial stage of tire molding and to bring the valve body 6 into contact with the valve seat 5 at the late stage of tire building. The configuration may be such that

  According to such a configuration, the valve body 6 is in contact with the valve seat 5 at a later stage of tire molding in which the rubber approaches the inflow hole 51. As a result, the valve body 6 can suppress the entry of rubber, and therefore, the occurrence of rubber biting between the valve body 6 and the valve seat 5 can be suppressed. And since it can suppress that gas accumulation generate | occur | produces in the molding chamber 1a, it can suppress that the rubber | gum defect of a tire generate | occur | produces.

  In such a configuration, it is preferable that the abutment surfaces 61d and 83a abut on each other so that the flow of gas in the circulation portion 9 is not blocked. For example, at least one of the contact surfaces 61d and 83a is a convex portion so that a part of the circulating portion 9 is formed between the contact surfaces 61d and 83a even when the contact surfaces 61d and 83a contact. A configuration in which at least one of the recesses is provided can be employed.

DESCRIPTION OF SYMBOLS 1 ... tire mold, 1a ... molding room, 2 ... mold, 2a ... side mold, 2b ... side mold, 2c ... tread mold, 3 ... mold main body, 4 ... rubber stop valve, 5 ... valve seat, 6 ... valve body, DESCRIPTION OF SYMBOLS 7 ... An urging body, 8 ... Case body, 9 ... Distribution part, 21 ... Molding surface, 31 ... Vent hole, 31a ... Vent inlet part, 31b ... Vent outlet part, 51 ... Inflow hole, 51a ... Upstream opening, 51b ... Diameter reduction part, 51c ... same diameter part, 51d ... downstream opening, 52 ... valve seat surface, 53 ... recess, 61 ... valve body, 61a ... valve body surface, 61b ... recess, 61c ... side circumferential surface, 61d ... contact Surface 61e: Convex portion 62: Base portion 81: Support portion 82: Outflow hole 83: Regulating portion 83a: Contact surface 91: First flow path portion 92: Second flow path portion

Claims (4)

Comprising a plurality of molds forming a molding chamber for molding the tire;
The mold includes a vent hole communicating the inside and the outside of the molding chamber in order to discharge the gas in the molding chamber, and a rubber stop valve disposed in the vent hole to suppress the intrusion of rubber. ,
The rubber stop valve has a valve seat having an inflow hole into which the gas in the molding chamber flows, a valve element that contacts the valve seat so as to cover the inflow hole so as to suppress the entry of rubber. The valve body includes an urging body that brings the valve body into pressure contact with the valve seat, and a circulation unit through which gas flowing from the inflow hole circulates toward the downstream side of the vent hole.
A tire mold comprising at least one of a convex portion and a concave portion such that at least one of the valve seat and the valve body is formed between the valve seat and the valve seat, with a part of the communication portion.   The tire mold according to claim 1, wherein the rubber stop valve includes a restricting portion that restricts the valve body from moving away from the valve seat by stopping the valve body. The valve body and the restricting portion include contact surfaces that contact each other,
A portion of the flow through is formed between the abutment surfaces,
The tire mold according to claim 2, wherein the contact surfaces are each formed in a planar shape so as to block the flow of gas in the flow portion by contacting each other. A rubber stop valve disposed inside a vent hole that communicates the inside and the outside of a molding chamber for molding a tire and suppressing entry of rubber,
A valve seat having an inflow hole into which the gas in the molding chamber flows, a valve body contacting the valve seat so as to cover the inflow hole, and an urging body bringing the valve body into pressure contact with the valve seat; And a circulation unit in which a gas flowing from the inflow hole circulates toward the downstream side of the vent hole,
A rubber stopper characterized in that at least one of the valve seat and the valve body has at least one of a convex portion and a concave portion so that a part of the circulation portion is formed between the valve seat and the valve body. valve.