WO2018145406A1 - 排气装置、其组装方法及具有该排气装置的轮胎模具 - Google Patents

排气装置、其组装方法及具有该排气装置的轮胎模具 Download PDF

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Publication number
WO2018145406A1
WO2018145406A1 PCT/CN2017/093784 CN2017093784W WO2018145406A1 WO 2018145406 A1 WO2018145406 A1 WO 2018145406A1 CN 2017093784 W CN2017093784 W CN 2017093784W WO 2018145406 A1 WO2018145406 A1 WO 2018145406A1
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WO
WIPO (PCT)
Prior art keywords
mandrel
spring
inner cavity
outer casing
outer sleeve
Prior art date
Application number
PCT/CN2017/093784
Other languages
English (en)
French (fr)
Inventor
李健
张伟
杜平
王万里
冯立新
孙鹏
臧贻照
Original Assignee
高密同创气门芯有限公司
山东豪迈机械科技股份有限公司
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Application filed by 高密同创气门芯有限公司, 山东豪迈机械科技股份有限公司 filed Critical 高密同创气门芯有限公司
Publication of WO2018145406A1 publication Critical patent/WO2018145406A1/zh

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D30/00—Producing pneumatic or solid tyres or parts thereof
    • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B29D30/0601—Vulcanising tyres; Vulcanising presses for tyres
    • B29D30/0606—Vulcanising moulds not integral with vulcanising presses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/10—Moulds or cores; Details thereof or accessories therefor with incorporated venting means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/30—Mounting, exchanging or centering
    • B29C33/305—Mounting of moulds or mould support plates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D30/00—Producing pneumatic or solid tyres or parts thereof
    • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B29D30/0601—Vulcanising tyres; Vulcanising presses for tyres
    • B29D30/0606—Vulcanising moulds not integral with vulcanising presses
    • B29D2030/0607—Constructional features of the moulds
    • B29D2030/0617—Venting devices, e.g. vent plugs or inserts

Definitions

  • the present invention relates to a tire mold. Further, the present invention relates to an exhaust device for a tire mold. The invention also discloses a method of assembling the exhaust device.
  • the production process of the tire is roughly as follows: the rubber material is passed through a series of processes to realize the formation of the green tire. After the green tire is formed, it is necessary to vulcanize the green tire of the tire using a tire mold. During the vulcanization process, it is necessary to discharge the air in the inner cavity of the tire mold. A commonly used method is to provide a vent hole on a tire mold through which air in the tire mold is directly discharged.
  • this method has some problems, one of which is that a rubber material for forming a tire is also extruded from the vent hole during the process of discharging air out of the tire mold. These extruded rubber materials will form a bristles on the tire tread, and the broken bristles will block the vent holes and affect the exhaust performance of the tire mold. In order to ensure the quality of the final tire product, an additional process is required to remove the glue formed on the tire. Therefore, the manufacturing process of the tire is complicated.
  • FIG. 4 is a schematic view of the exhaust device 100 disposed in the air hole 210 on the tire mold 200, which allows the air in the tire mold 200 to be discharged while preventing the rubber material from being squeezed from the tire mold 200. Out.
  • FIG. 5 A cross-sectional view of the exhaust device 100 of the tire mold is shown in FIG. 5, the exhaust device 100 including a jacket 110, a spring 120 and a mandrel 130, the spring 120 and the mandrel 130 being received in the inner cavity 111 of the outer casing 110, And the spring 120 exerts a biasing force on the shaft head 131 of the mandrel 130 such that there is a gap between the shaft head 131 and the outer casing 110, allowing air in the tire mold to escape.
  • the rubber material is pressed against the shaft head 131, thereby closing the gap between the shaft head 131 and the outer sleeve 110 against the biasing force of the spring 120, preventing the rubber material from being extruded.
  • venting sleeve of the above structure also has some problems.
  • the mounting tolerance of the closing stroke of the shaft head is difficult to control and cannot be controlled within a reasonable range;
  • the art is complicated, and even if it is fixed, the mandrel is easy to fall off.
  • the present invention has been made to solve the above-described technical problems in the prior art. It is an object of the present invention to provide an exhaust device for a tire mold which is simple to assemble and has excellent assembly stability. A further object of the invention is to improve the mandrel stroke tolerance range of the venting device.
  • the exhaust device for a tire mold of the present invention includes:
  • a jacket having an inner cavity formed therein and the inner cavity opening at the first end of the outer casing;
  • a mandrel the mandrel is received in the inner cavity, and a shaft head is formed at the first end of the mandrel, the mandrel being movable between the first position and the second position along the axial direction of the outer sleeve, in the first position a gap formed between the shaft head and the outer casing, and a sealing fit between the shaft head and the outer casing at the second position;
  • the spring is coupled to the mandrel, and applies a biasing force to the mandrel to bias the core axially to the first position;
  • the spring is coupled to the mandrel, and the first restricting portion and the second restricting portion are formed in the inner cavity, wherein the first restricting portion is formed in the inner cavity, and when the mandrel reaches the first position, the first The restricting portion is in contact with the spring and/or the mandrel to prevent movement of the mandrel further toward the first end of the outer sleeve, and the second restricting portion is formed at a position in the inner cavity near or at the second end of the outer sleeve, and supports the spring to Limiting the movement of the spring toward the second end of the outer sleeve.
  • the mandrel and the spring connected to the mandrel can be restrained in the inner cavity of the outer casing by the arrangement of the first and second restricting portions, thereby preventing the mandrel from being detached from the inner cavity It falls out and can improve the range of travel of the mandrel relative to the movement of the outer casing, making it within a reasonable range. Further, the exhaust device having the above structure can be easily assembled.
  • the first restricting portion may be a step portion disposed in the inner cavity; and the second restricting portion may be a narrowing portion formed at the second end of the outer sleeve, the inner diameter of the narrowing portion being smaller than The outer diameter of the second end of the spring.
  • the constricted portion may be unreduced, and the constricted portion is contracted after the spring and the mandrel are mounted in the outer casing.
  • the spring and the mandrel can be conveniently assembled into the outer casing.
  • constriction can also be contracted before the spring is installed in the outer casing, and the spring will be inserted into the outer casing from the other end. This also does not go beyond the scope of the invention.
  • one end of the spring can be interference fit on the mandrel.
  • a groove may be formed in the mandrel, and one end of the spring is fitted in the groove to fix the spring to the mandrel.
  • the groove may be a spiral groove.
  • the first tapered surface is formed on the shaft head
  • the second tapered surface is formed on the first end of the outer sleeve, and the shapes of the first tapered surface and the second tapered surface are matched with each other.
  • a reliable seal can be formed between the shaft head and the outer casing.
  • the inner cavity includes a small diameter portion, the inner diameter of the small diameter portion is smaller than the inner diameter of the remaining portion of the inner cavity, and the second end of the mandrel extends into or extends through the small diameter portion; the spring is coupled to the mandrel On the second end.
  • the small diameter portion can play a guiding role during the insertion of the mandrel, thereby enabling the mandrel and the spring to be more easily aligned, simplifying the assembly process.
  • the inner diameter of the portion of the inner cavity other than the small diameter portion can be set larger, thereby achieving the effect of rapid exhaust.
  • At least one vent groove portion is provided on an outer peripheral surface of a portion of the mandrel that is engaged with the small diameter portion.
  • the venting groove portion can increase the area of the exhaust passage to further rapidly exhaust.
  • a step portion of the inner cavity is formed at an end of the small diameter portion near the second end side of the outer casing, and when the mandrel is moved to the first position, the step portion and the mandrel of the inner cavity The second end is and/or in contact with the spring to prevent movement of the mandrel further toward the first end of the outer casing.
  • a mandrel step portion is formed on the second end of the mandrel, and when the mandrel moves to the second position, the mandrel step portion abuts against the step portion of the inner cavity, preventing the mandrel from further facing the first portion of the outer casing The movement of the end.
  • at least the second end of the mandrel is made of an elastic material.
  • the invention further relates to a tire mold in which at least one venting opening is provided, in which an exhaust device as described above is mounted.
  • the installation method of the exhaust device of the present invention is as follows:
  • the mandrel is inserted into the inner cavity of the outer casing from the first end of the outer casing.
  • the second end of the outer sleeve may be in an uncontracted state before the spring is inserted, the spring is inserted into the inner cavity from the second end of the outer sleeve, and then the position and/or the vicinity of the second end of the outer sleeve is contracted, A second restricting portion is formed to support the spring.
  • the outer casing may be provided in a state in which the second end of the outer casing is contracted to form the second restricting portion, and the spring is inserted into the inner cavity from the first end of the outer casing.
  • the outer diameter of the spring it is only necessary to set the outer diameter of the spring to be smaller than the inner diameter of the first end of the inner cavity.
  • the spring and the mandrel may be inserted into the lumen one after the other, or may be simultaneously inserted into the lumen.
  • the spring and the mandrel can be inserted into the inner cavity and then connected to each other.
  • the spring and the mandrel are first joined together, and then the spring and the mandrel are inserted together into the inner cavity, again without departing from the scope of the invention.
  • Fig. 1 shows a cross-sectional view of a first embodiment of an exhaust device of the present invention.
  • Figure 2 shows a cross-sectional view of a second embodiment of the venting apparatus of the present invention.
  • Fig. 3 shows a cross-sectional view of a third embodiment of the exhaust device of the present invention.
  • Fig. 4 schematically shows the mounted state of the exhaust device in the tire mold.
  • Figure 5 shows a cross-sectional view of a prior art venting device.
  • Fig. 1 shows a cross-sectional view of an exhaust device 1 of a first embodiment of the present invention.
  • the exhaust device 1 includes a jacket 10 in which an inner chamber 11 having open ends is formed.
  • the spring 20 and the mandrel 30 are inserted into the inner cavity 11 of the outer casing 10.
  • a shaft head 31 is formed on one end of the mandrel 30, and the outer peripheral surface of the shaft head 31 is formed in the form of a shaft-shaped tapered surface 32.
  • the inner cavity 11 forms an outer casing surface 13 on the inner peripheral surface at the first end 12 of the outer casing 10 (i.e., the end of the inner surface of the tire mold in the mounted state), and the conical cone surface 32.
  • the shapes match.
  • the journal conical surface 32 of the mandrel 30 can cooperate with the outer casing tapered surface 13 of the outer casing 10 to form a seal.
  • the axicon cone surface 32 and the outer casing tapered surface 13 may be conical surfaces, or may be pyramidal shapes such as triangular pyramids or quadrangular pyramids, as long as their shapes can match each other.
  • the mating faces between the shaft head 31 and the first end 12 of the outer sleeve 10 can be otherwise.
  • the shaft head 31 may be formed as a cylinder having a cross-sectional dimension larger than a cross-sectional dimension of the inner chamber 11 and a first end surface of the shaft head 31 and the first outer casing 10 when the mandrel 30 is in the second position.
  • the end faces at the ends 12 are in intimate contact with one another to form a sealed fit.
  • the so-called cross-sectional dimension may be in various forms, when the cross section is circular, the diameter of the circle, when the cross section is square, the side length of the square, and the like.
  • the spring 20 is coupled to the mandrel 30.
  • a spring groove 33 for accommodating the spring 20 is formed on the mandrel 30, for example, near the end of the mandrel 30 opposite the shaft head 31, and one end of the spring 20 is fixedly fitted. In the spring groove 33, the spring 20 is thereby fixedly connected to the mandrel 30.
  • a mandrel chamfer portion 34 is formed on an end of the mandrel 30 facing the spring 20, the mandrel chamfer portion 34 guiding the spring 20 to facilitate fitting the spring 20 to the mandrel 30 .
  • connection structure between the spring 20 and the mandrel 30 may take other forms as will be described in more detail in the following embodiments.
  • the mandrel 30 is movable between a first position and a second position along the axial direction of the outer casing 10, wherein at the first position, the conical surface 32 of the shaft head 31 and the outer casing cone 13 of the outer casing 10 There is a gap between the air in the tire mold from which the air enters the inner cavity 11 of the outer casing 10 and is subsequently discharged, and in the second position, the outer casing cone 13 is in contact with the conical cone 32 and pressed against each other. Thus forming a dense Sealed.
  • the spring 20 applies a biasing force to the mandrel 30 toward the first position such that, in the absence of an external force, the gap between the journal cone 32 and the outer casing cone 13 opens, allowing air to pass.
  • the inner chamber 11 of the outer casing 10 is provided with first and second restricting portions for restraining the spring 20 and the mandrel 30 in the outer casing 10.
  • a step 15 is provided in the interior 11 of the outer casing 10, the step 15 being sized to be able to engage a portion of the mandrel 30 when the mandrel 30 is in the first position and At least one of the springs fixed to the mandrel 30 is in contact. This contact prevents the mandrel 30 from moving further in the direction of the first end 12 of the outer sleeve 10 beyond the first position, i.e., limiting the stroke range S of the mandrel 30 between the first position and the second position.
  • At least one, preferably a plurality of grooves may be provided in the vicinity of the step portion 15 (not in the Shown in the figure), the air flow is passed through.
  • the lower end of the mandrel 30, particularly the portion of the mandrel 30 that is in contact with the spring 20, is machined, for example, by milling to form at least one, preferably more
  • the milling planes are such that only a portion of the portion of the mandrel 30 that is in contact with the spring 20 is in contact with the spring, and there is a gap between the other portion and the spring 20 for airflow therethrough.
  • the specific value of the stroke range S of the mandrel 30 can be selected, whereby the stroke range S can be set within a reasonable range.
  • a constriction 16 serving as a second restriction.
  • the inner diameter of the constricted portion 16 is set to be smaller than the outer diameter of the spring 20, thereby confining the spring 20 in the inner cavity 11 of the outer casing 10, preventing the spring 20 from falling out.
  • the constricted portion 16 is disposed in such a manner that, as shown in FIG. 1, a thin portion having a wall thickness smaller than that of the other portion of the outer casing 10 is provided at the second end 14 of the outer casing 10, and the thin portion is easily plastically deformed.
  • the inner diameter of the outer sleeve 10 at the thin wall portion is substantially the same as the other portions, i.e., the second end 14 is in an unrecessed state, and after the spring 20 is assembled into the inner chamber 11, the thin wall portion is applied.
  • a certain external action for example, application of a mechanical force or the like, deforms the thin portion and reduces the inner diameter, thereby forming the constricted portion 16.
  • the neck portion 16 can also be formed in other known ways in the prior art, such as a heat shrinkable material to form at least the second end 14 of the outer sleeve 10, and the spring 20 is assembled into the outer sleeve 10. Thereafter, the second end 14 is heated to be heat-shrinked to form the constricted portion 16. It is also possible to make the inner diameter of the second end smaller by spot welding points at the second end, and form the neck portion 16 to serve as a limit function.
  • the constricted portion 16 is also not necessarily provided at the extreme end of the second end 14, but may be disposed on a portion of the outer casing 10 adjacent to the second end 14.
  • the spring 20 and the mandrel 30 are restrained in the inner cavity 11 of the outer casing 10 by the step portion 15 and the constricted portion 16, and the stroke of the mandrel 30 in the axial direction of the outer casing 10 is restricted. Range S.
  • the mandrel 30 can be prevented from coming off the outer casing 10, and the stroke range S of the mandrel 30 can be set within a reasonable numerical range.
  • the assembly of the exhaust device 1 is also relatively simple.
  • the prepared outer casing 10, spring 20 and mandrel 30 are provided.
  • the spring 20 and the mandrel 30 are inserted into the inner chamber 11, and the spring 20 and the mandrel 30 are joined.
  • the mandrel 30 can be inserted into the inner chamber 11 from the first end 12 of the outer sleeve 10 and the spring 20 can be inserted into the inner chamber 11 from the second end 14 of the outer sleeve 10.
  • the second end 14 of the outer sleeve 10 remains unshrinked, and the outer diameter of the spring 20 should be smaller than the inner diameter of the undeflected second end 14, thereby allowing the spring 20 to be retained.
  • the inner end 11 of the outer sleeve 10 is inserted from the second end 14.
  • the second end 14 of the outer sleeve 10 and/or the portion adjacent the second end 14 can be retracted to form the constricted portion 16, thereby confining the spring 20 to In the inner chamber 11, so that the spring 20 does not fall out.
  • the second end 14 of the outer sleeve 10 can also be crimped prior to being provided, or prior to insertion of the spring. In this case, it is ensured that the outer diameter of the spring 20 is smaller than the inner diameter of the first end 12 of the inner chamber 11, so that the spring 20 can be inserted into the inner chamber 11 from the first end 12.
  • the outer diameter of the body portion of the mandrel 30 should obviously also be smaller than the inner diameter of the inner cavity 11, but at least a portion of the axial end 31 of the mandrel 30 The diameter should be greater than the inner diameter of the first end 12 of the inner chamber 11 so that the shaft head 31 does not completely fall into the inner chamber 11 and does not form a sealing fit between the first end 12 of the inner chamber 11 and the shaft head 31.
  • the spring 20 and the mandrel 30 may be inserted into the inner chamber 11 one after another, or may be simultaneously inserted into the inner chamber 11. And, after the spring 20 and the mandrel 30 are both inserted into the inner cavity 11, the spring 20 is attached to the mandrel 30. In addition, the spring 20 and the mandrel 30 are first connected and then inserted into the outer casing. 10. This is also within the scope of the invention.
  • FIG. 1 An exhaust device 1 of a second embodiment of the present invention is shown in FIG.
  • FIG. 1 An exhaust device 1 of a second embodiment of the present invention is shown in FIG.
  • FIG. 1 An exhaust device 1 of a second embodiment of the present invention is shown in FIG.
  • the contents described in the first embodiment are equally applicable to the second embodiment, and will not be described in detail herein.
  • a small diameter portion 17 is provided in the inner cavity 11 of the outer casing 10, for example, inwardly extending on the inner wall of the inner chamber 11.
  • the convex ring whereby the inner diameter of the small diameter portion 17 is smaller than the inner diameter of the other portion of the inner chamber 11.
  • the end of the mandrel 30 facing the spring 20 extends at least into the small diameter portion 17, or may pass through the small diameter portion 17.
  • the small diameter portion 17 can guide the mandrel 30 during the process of mounting the mandrel 30 into the inner cavity 11 of the outer casing 10, thereby facilitating the positioning of the mandrel 30, thereby Contributes to the alignment and assembly between the mandrel 30 and the spring 20.
  • the small diameter portion 17 is provided for guiding during the assembly of the mandrel 30, the inner diameter of the remaining portion of the inner chamber 11 can be set relatively large, thereby increasing the exhaust passage and achieving rapid discharge. gas.
  • At least one, preferably a plurality of venting grooves 18 for exhausting may be provided on the outer peripheral surface of the portion of the mandrel 30 that mates with the small diameter portion 17. In this way, the area of the exhaust passage between the mandrel 30 and the small diameter portion 17 of the inner chamber 11 can be further increased.
  • At least one end portion of the small diameter portion 17 facing the second end 14 of the outer casing 10 is formed with a step portion 15 of the inner cavity, the step portion 15 being provided for blocking when the mandrel 30 is moved to the first position Further movement of the mandrel 30.
  • the step portion 15 being provided for blocking when the mandrel 30 is moved to the first position Further movement of the mandrel 30.
  • a mandrel step portion 35 is formed on the second end of the mandrel 30, and when the mandrel 30 is moved to the first position, the step of the mandrel is The portion 35 abuts the step 15 in the inner cavity 11 of the outer sleeve 10 such that the mandrel 30 cannot move further toward the first end of the outer sleeve 10, thereby limiting the stroke range S of the mandrel 30 to the first Between the location and the second location.
  • the specific position of the step portion 15 in the inner cavity 11 can be set according to specific needs, and by selecting the specific position of the inner cavity step portion 15 in the inner cavity 11, the stroke range S of the mandrel 30 can be selected.
  • the specific value makes it possible to set the stroke range S within a reasonable range.
  • the inner cavity step portion 15 can abut against the spring 20 fitted to the mandrel 30, thereby preventing the mandrel 30 from furthering.
  • the mandrel step portion 35 is not essential.
  • At least the second end of the mandrel 30 is made of an elastic material, which is formed with a mandrel chamfer portion 34 on the second end of the mandrel 30.
  • the mandrel 30 can be made entirely of an elastic material.
  • the mandrel 30 is not provided with a groove for accommodating the spring as in the first embodiment, but between the spring 20 and the mandrel 30.
  • Form an interference fit Specifically, in FIG. 2, the end of the mandrel 30 facing the spring 20 is formed with a mandrel chamfer portion 34 including a small diameter end facing the spring 20 and a back-to-spring The large diameter end of 20, wherein the diameter of the small diameter end is smaller than the inner diameter of the spring 20, and the diameter of the large diameter end is larger than the inner diameter of the spring 20, whereby in the process of assembling the spring 20 to the mandrel 30, the spring 20 and the mandrel An interference fit is formed between 30.
  • the portion of the mandrel 30 that mates with the spring 20 is not limited to the shape of the mandrel chamfer 34 shown in the drawings, and other shapes or other methods of assembly may be employed.
  • the mandrel 30 can be arranged such that the overall diameter is slightly larger than the inner diameter of the spring 20 in the normal temperature state, and during assembly, at least a portion of the spring 20 is heated, for example, dipped in hot oil, and then the spring 20 is The sleeve is sleeved onto the mandrel 30. As the spring 20 cools, the inner diameter of the spring 20 is reduced due to the effect of thermal expansion and contraction, thereby interference fit on the mandrel 30.
  • FIG. 1 An exhaust device 1 of a third embodiment of the present invention is shown in FIG.
  • FIG. 1 Features different from the third embodiment and the first and second embodiments will be mainly described below. Apart from this, the contents described in the first and second embodiments are equally applicable to the third embodiment unless otherwise stated, and will not be described in detail herein. Bright.
  • the mandrel 30 is also provided with a spring groove 33 for receiving the spring 20 to connect the spring 20 to the mandrel 30.
  • the spring groove 33 is in the form of a thread groove.
  • the pitch of the threads in the thread groove is substantially matched with the pitch between the turns of the spring 20, whereby the respective springs fitted into the thread groove of the spring 20 can be respectively fixed, thereby making the spring The fit between the 20 and the mandrel 30 is more robust.

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  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Thermal Sciences (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

一种轮胎模具的排气装置（1），包括该排气装置（1）的轮胎模具和组装该排气装置（1）的方法，排气装置（1）包括外套（10）、芯轴（30）和弹簧（20），在外套（10）中形成有内腔（11），芯轴（30）容纳在内腔（11）中，且能够沿着外套（10）的轴向在第一位置和第二位置之间运动，在第一位置，芯轴（30）的轴头（31）和外套（10）之间形成有间隙，在第二位置，轴头（31）和外套（10）之间密封配合。弹簧（20）连接于芯轴（30），将芯轴（30）向着第一位置偏置。在内腔（11）中形成有第一限制部和第二限制部，分别限制芯轴（30）朝向外套（10）的第一端（12）的运动和限制弹簧（20）朝向外套（10）的第二端（14）的运动。通过该排气装置（1）的结构，防止芯轴（30）脱落，可控制芯轴（30）的行程范围，还简化了排气装置（1）的组装。

Description

排气装置、其组装方法及具有该排气装置的轮胎模具 技术领域
本发明涉及一种轮胎模具，进一步地，本发明涉及一种用于轮胎模具的排气装置。本发明还公开了该排气装置的组装方法。
背景技术
目前对轮胎的生产过程大致如下：将橡胶材料通过一系列的工艺来实现胎胚成型。在胎胚成型之后，需要使用轮胎模具对轮胎的胎胚进行硫化处理。在硫化处理过程中，需要将轮胎模具的内腔中的空气排出。目前通常使用的方法是在轮胎模具上设置排气孔，轮胎模具中的空气经过该排气孔直接排出。
不过，这种方式存在一些问题，其中之一是在将空气排出轮胎模具的过程中，用来形成轮胎的橡胶材料也会从该排气孔中被挤出一部分。这些被挤出的橡胶材料会在轮胎胎面上形成胶毛，取胎时断裂的胶毛会堵塞排气孔，影响轮胎模具的排气性能。为了保证最终轮胎产品的质量，需要提供额外的工序来将形成在轮胎上的胶毛去除。因此，使得轮胎的制造工序变得复杂。
为了避免轮胎产品上胶毛的产生，开发了一种用于轮胎模具的排气装置。图4中示出了，排气装置100设置在轮胎模具200上的气孔210中的示意图，该排气装置100可允许轮胎模具200中的空气排出，同时阻止橡胶材料从轮胎模具200中被挤出。
图5中示出了该轮胎模具的排气装置100的截面图，该排气装置100包括外套110、弹簧120和芯轴130，弹簧120和芯轴130容纳在外套110的内腔111中，且弹簧120在芯轴130的轴头131上施加偏置力，使得轴头131与外套110之间存在间隙，允许轮胎模具中的空气排出。而当轮胎模具中的空气被排尽之后，橡胶材料会压靠到轴头131上，从而克服弹簧120的偏置力关闭轴头131和外套110之间的间隙，阻止橡胶材料被挤出。
不过，上述结构的气孔套也有一些问题。例如，在组装过程中，轴头的关闭行程的安装公差难以控制，无法将其控制在合理的范围内；而且，芯轴的固定工 艺复杂，且即使固定好，芯轴也容易脱落。
因此，在轮胎模具的领域中，仍存在进一步改进其排气装置的需求，以能够提高组装稳定性，优化芯轴行程的公差范围，以及能够简化对排气装置的组装。
发明内容
本发明是为解决现有技术中的上述技术问题而作出的。本发明的目的是提供一种用于轮胎模具的排气装置，该排气装置组装简单，且组装稳定性佳。本发明的进一步的目的是改进排气装置的芯轴行程公差范围。
本发明中用于轮胎模具的排气装置包括：
外套，外套中形成有内腔，且内腔在外套的第一端处开口；
芯轴，芯轴容纳在内腔中，且在芯轴的第一端处形成有轴头，芯轴能够沿着外套的轴向在第一位置和第二位置之间运动，在第一位置处，在轴头和外套之间形成有间隙，在第二位置处，轴头和外套之间密封配合；以及
弹簧，弹簧与芯轴相连接，并向芯轴施加偏置力，将芯轴向着第一位置偏置；
其中，弹簧连接在芯轴上，并且，在内腔中形成有第一限制部和第二限制部，其中，第一限制部形成在内腔内，当芯轴达到第一位置时，第一限制部与弹簧和/或芯轴相接触，阻止芯轴进一步朝向外套的第一端的运动，第二限制部形成在内腔中靠近或位于外套的第二端的位置处，并支承弹簧，以限制弹簧朝向外套的第二端的运动。
在上述结构的排气装置中，通过第一和第二限制部的设置，可以将芯轴和连接在芯轴上的弹簧都限制在外套的内腔中，由此防止芯轴从内腔中掉出，并且能够改进芯轴相对于外套的运动的行程范围，使之处于合理的范围之内。进一步地，具有上述结构的排气装置能够方便地组装。
在一种具体结构中，上述第一限制部可为设置在内腔中的台阶部；而上述第二限制部可为形成在外套的第二端处的缩口部，缩口部的内径小于弹簧的第二端的外径。
其中，在组装之前，该缩口部可以是未缩口的，在将弹簧和芯轴安装到外套中之后再使缩口部收缩。由此，可方便地将弹簧和芯轴组装到外套中。
当然，也可将弹簧安装到外套中之前就使缩口部收缩，而从另一端将将弹簧插入外套中。这同样没有超出本发明的范围。
关于弹簧和芯轴之间的连接方式，在一种情况中，可将弹簧的一端过盈配合在芯轴上。或者，可以在芯轴上形成有凹槽，将弹簧的一端配合在凹槽中，从而将弹簧固定在芯轴上。进一步地，该凹槽可为螺旋槽。
较佳地，轴头上形成有第一锥面，外套的第一端上形成有第二锥面，第一锥面和第二锥面的形状互相匹配。这样，当芯轴处于其第二位置时，可以在轴头和外套之间形成可靠的密封。
较佳地，在内腔中包括有小直径部，小直径部的内径小于内腔中的其余部分的内径，芯轴的第二端伸入或延伸穿过小直径部；弹簧连接在芯轴的第二端上。
通过该小直径部的设置，在插入芯轴的过程中小直径部可以起到引导作用，从而使芯轴和弹簧能够更容易地对准，简化组装过程。而且，在该结构下，内腔的除小直径部以外的部分的内径可以设置得较大，从而实现快速排气的效果。
在芯轴的与小直径部相配合的部分的外周面上设置有至少一个通气槽部。该通气槽部能够增加排气通道的面积，从而进一步地快速排气。
在一种具体结构中，在小直径部的靠近外套的第二端一侧的端部处形成有内腔的台阶部，当芯轴运动到第一位置时，内腔的台阶部与芯轴的第二端和/或与弹簧相接触，以阻止芯轴进一步朝向外套的第一端的运动。
进一步地，在芯轴的第二端上形成有芯轴台阶部，当芯轴运动到第二位置时，芯轴台阶部与内腔的台阶部相抵靠，阻止芯轴进一步朝向外套的第一端的运动。在此情况下，较佳地，至少芯轴的第二端由弹性材料制成。
本发明还涉及一种轮胎模具，该轮胎模具中设有至少一个排气孔，在该排气孔中安装有如上所述的排气装置。
本发明的排气装置的安装方法如下：
提供所述外套、所述弹簧和所述芯轴；
将所述弹簧从所述外套的所述第一端或所述第二端插入所述外套的所述内腔中；
将所述弹簧连接到所述芯轴上；以及
将所述芯轴从所述外套的所述第一端插入所述外套的所述内腔中。
在以上所述的方法中，除非明确说明，或者根据实际情况被判断为不可能，对各个步骤的顺序并没有固定的规定，甚至其中一些步骤可以同时或几乎同时进行。
例如，在未插入弹簧之前，外套的第二端可以是处于未收缩状态，从外套的第二端将弹簧插入内腔中，然后再使外套的第二端的位置处和/或附近部分收缩，形成第二限制部，以支承弹簧。
或者，也可以是以外套的第二端收缩而形成第二限制部的状态提供外套，并且是从外套的第一端将弹簧插入内腔中。在此情况下，只需将弹簧的外直径设置成小于内腔的第一端的内直径即可。
此外，弹簧和芯轴可以是先后插入内腔中的，也可以是同时插入内腔中的。弹簧和芯轴可以先插入内腔中，再互相连接。当然，先将弹簧和芯轴连接在一起，然后再将弹簧和芯轴一起插入内腔中，这同样不会超出本发明的范围。
附图说明
图1示出了本发明的排气装置的第一实施例的截面图。
图2示出了本发明的排气装置的第二实施例的截面图。
图3示出了本发明的排气装置的第三实施例的截面图。
图4示意性地示出了排气装置在轮胎模具中的安装状态。
图5示出了一种现有技术的排气装置的截面图。
具体实施方式
以下将参照附图1-4对本发明的较佳实施方式进行详细描述。应当了解，附图中所示的仅仅是本发明的较佳实施例，其并不构成对本发明的范围的限制。本领域的技术人员可以在附图所示的实施例的基础上对本发明进行各种显而易见的修改、变型、等效替换，并且在不相矛盾的前提下，在以下所描述的不同实施例中的技术特征可以任意组合，而这些都落在本发明的保护范围之内。
<第一实施例>
图1示出了本发明的第一实施例的排气装置1的截面图。如图1所示，排气装置1包括外套10，在外套10中形成有两端开口的内腔11。弹簧20和芯轴30插入在外套10的内腔11中。
芯轴30的一端上形成有轴头31，该轴头31的外周面形成轴头锥面32的形式。与之相对应地，内腔11在外套10的第一端12(即在安装状态下面对轮胎模具内部的那一端)处的内周面上形成外套锥面13，与轴头锥面32形状相匹配。这样，芯轴30的轴头锥面32能够与外套10的外套锥面13相配合，形成密封。
轴头锥面32和外套锥面13可以是圆锥面，也可以是三棱锥、四棱锥等棱锥形状，只要它们的形状能够互相匹配既可。
进一步地，除了锥面以外，轴头31和外套10的第一端12之间相配合的面也可为其它形式。例如，轴头31可形成为柱体，该柱体的横截面尺寸大于内腔11的横截面尺寸，当芯轴30处于第二位置时，轴头31的一侧端面与外套10的第一端12处的端面互相紧密接触，从而形成密封配合。此处，所谓的横截面尺寸可以是多种形式，当横截面为圆形时，为该圆形的直径，当横截面为正方形时，为该正方形的边长，等等。
弹簧20与芯轴30相连接。在图1所示的一种连接方式中，在芯轴30上、例如在芯轴30的与轴头31相对的一端附近形成用于容纳弹簧20的弹簧凹槽33，弹簧20的一端固定配合在该弹簧凹槽33中，由此使弹簧20与芯轴30固定连接。
较佳地，在芯轴30的与弹簧20相面对的一端上形成有芯轴倒角部34，该芯轴倒角部34可引导弹簧20，从而便于将弹簧20装配到芯轴30上。
弹簧20与芯轴30之间的连接结构还可采取其它形式，这将在之后的实施例中再具体描述。
芯轴30可沿着外套10的轴线方向在第一位置和第二位置之间运动，其中，在第一位置处，在轴头31的轴头锥面32与外套10的外套锥面13之间存在间隙，轮胎模具中的空气可从该间隙进入外套10的内腔11中，并随后排出，而在第二位置处，外套锥面13与轴头锥面32相接触并彼此压靠，从而形成密 封配合。
弹簧20对芯轴30施加朝着第一位置的偏置力，从而在没有外力作用的情况下，轴头锥面32和外套锥面13之间的间隙打开，允许空气通过。
在本发明中，在外套10的内腔11设置有第一和第二限制部，用来将弹簧20和芯轴30限制在外套10中。在图1所示的结构中，在外套10的内腔11中设置有台阶部15，该台阶部15的尺寸被设置成在芯轴30处于第一位置时，能够与芯轴30的一部分以及固定在芯轴30上的弹簧两者中的至少一个相接触。该接触阻止芯轴30进一步朝着外套10的第一端12的方向运动而越过上述第一位置，即，将芯轴30的行程范围S限制在第一位置和第二位置之间。
较佳地，为了避免台阶部15与弹簧20或者芯轴30的一部分的接触造成堵塞气流通道的结果，在该台阶部15附近可以设置至少一个、较佳地为多个的凹槽(未在图中示出)，供气流通过。
在另一种未示出的较佳结构中，对芯轴30的下端、特别是芯轴30与弹簧20相接触的那部分进行加工，例如进行铣削加工而形成至少一个、较佳地为多个的铣削平面，使芯轴30与弹簧20相接触的部分处仅有一部分与弹簧接触，另一部分与弹簧20之间存在有间隙，从而供气流通过。
通过设置台阶部15在内腔11中的具体位置，可以选择芯轴30的行程范围S的具体数值，由此能够将该行程范围S设置在合理的范围之内。
在外套10的与第一端12相对的第二端14(即在安装状态下与轮胎模具的内部相背的那一端)处设置有缩口部16，充当第二限制部。该缩口部16的内直径被设置成小于弹簧20的外直径，从而将弹簧20限制在外套10的内腔11中，防止弹簧20掉出。
缩口部16以如下方式设置：如图1所示，在外套10的第二端14处设置有壁厚小于外套10的其它部分的薄壁部，该薄壁部易于塑性变形。在组装之前，外套10在该薄壁部处的内径与其它部分基本相同，即第二端14处于未缩口的状态，而在将弹簧20组装到内腔11中之后，对薄壁部施加一定的外部作用，例如施加机械力等，使薄壁部变形而内径缩小，从而形成缩口部16。
当然，也可用现有技术中其它已知的方式来形成该缩口部16，比如可以用热缩材料来至少形成外套10的第二端14，在将弹簧20组装到外套10中之 后，对第二端14加热，使其热缩而形成缩口部16。还可以通过在第二端处点焊点等方式，使第二端内径变小，形成缩口部16，以起到限位作用
该缩口部16也并不必须是设置在第二端14的最末端处，也可以是设置在外套10的靠近第二端14的部分上。
通过上述结构的排气装置1，由台阶部15和缩口部16将弹簧20和芯轴30限制在外套10的内腔11内，并限制芯轴30沿着外套10的轴向运动的行程范围S。这样，可以防止芯轴30从外套10脱落，并且能够将芯轴30的行程范围S设定在合理的数值范围内。此外，该排气装置1的组装也比较简单。
下面将描述排气装置1的组装方法：
首先，提供制备好的外套10、弹簧20和芯轴30。
接着，将弹簧20和芯轴30插入内腔11中，并且使弹簧20和芯轴30连接起来。在此步骤中，可以从外套10的第一端12将芯轴30插入内腔11中，并从外套10的第二端14将弹簧20插入内腔11中。其中，在插入弹簧20的过程中，外套10的第二端14保持未缩口的状态，而弹簧20的外直径应小于未缩口的第二端14的内直径，由此允许将弹簧20从第二端14插入外套10的内腔11中。
在将弹簧20从第二端14插入内腔11中之后，可以使外套10的第二端14和/或该第二端14附近的部分收缩，形成缩口部16，从而将弹簧20限制在内腔11中，以免弹簧20掉出。
或者，外套10的第二端14也可以在被提供、或者说在插入弹簧之前就已经是缩口的。在此情况下，要确保弹簧20的外直径小于内腔11的第一端12的内直径，从而可以从该第一端12将弹簧20插入内腔11中。
当然，为了能够将芯轴30从外套10的第一端插入，芯轴30的主体部分的外直径显然也应小于内腔11的内直径，不过芯轴30的轴头31的至少一部分的外直径应大于内腔11的第一端12的内直径，以免轴头31完全落入内腔11中而无法在内腔11的第一端12和轴头31之间形成密封配合。
进一步地，弹簧20和芯轴30可以是先后插入内腔11中的，也可是同时插入内腔11中进行。并且，在弹簧20和芯轴30都插入内腔11中之后，使弹簧20连接到芯轴30上。此外，先将弹簧20和芯轴30连接起来，再插入外套 10，这同样在本发明的范围内。
对于以上所描述的方法，除非明确说明，或者根据实际情况被判断为不可能，可以根据实际情况和需要来调整各个步骤的顺序。
<第二实施例>
图2中示出了本发明的第二实施例的排气装置1。下面将主要描述第二实施例与第一实施例之间不同的特征。除此之外，除非有相反的表述，在第一实施例中所描述的内容同样适用于第二实施例，在此不再作详细说明。
在图2所示的第二实施例中，为了使排气装置1的组装更方便，在外套10的内腔11中设置小直径部17，例如在内腔11的内壁上形成向内延伸的凸环，由此，该小直径部17的内径比内腔11的其它部分的内径小。在组装好的状态下，芯轴30的与弹簧20相面对的一端至少延伸到该小直径部17内，或者可以穿过该小直径部17。
通过设置该小直径部17，在将芯轴30安装到外套10的内腔11中的过程中，小直径部17可以对芯轴30起到引导作用，从而有助于定位芯轴30，进而有助于芯轴30和弹簧20之间的对准和装配。
而且，由于设置了小直径部17用于在组装芯轴30的过程中起到引导作用，因此可以将内腔11的其余部分的内径设置得比较大，从而增大排气通道，实现快速排气。
较佳地，可以在芯轴30的与小直径部17相配合的部分的外周面上设置至少一个、较佳地为多个用于排气的通气槽部18。这样，可以进一步增加芯轴30和内腔11的小直径部17之间的排气通道面积。
至少在该小直径部17的面对外套10的第二端14的那一侧端部形成有内腔的台阶部15，该台阶部15设置用于在芯轴30运动到第一位置时阻止芯轴30的进一步运动。具体来说，在图2所示的一种示例性结构中，在芯轴30的第二端上形成有芯轴台阶部35，当芯轴30运动到第一位置时，该芯轴的台阶部35与外套10的内腔11中的台阶部15相抵靠，从而使得芯轴30无法进一步朝着外套10的第一端的方向运动，由此将芯轴30的行程范围S限制在第一位置和第二位置之间。
进一步地，台阶部15在内腔11中的具体位置可以根据具体的需要来设置，而通过选择内腔台阶部15在内腔11中的具体设置位置，可以选择芯轴30的行程范围S的具体数值，由此能够将该行程范围S设置在合理的范围之内。
在另一种未示出的实施方式中，当芯轴30运动到第一位置时，内腔台阶部15可以与配合在芯轴30上的弹簧20互相抵接，从而实现阻止芯轴30进一步运动的效果。在此情况下，芯轴台阶部35就不是必须的。
此外，为了更加便于将芯轴30插入外套10的内腔11中，芯轴30中至少第二端由弹性材料制成，这在芯轴30的第二端上形成有芯轴倒角部34的情况下尤其有利。较佳地，芯轴30可完全由弹性材料制成。
此外，从图2中可以看到，在排气装置1中，芯轴30上并没有如第一实施例中那样设置用于容纳弹簧的凹槽，而是在弹簧20与芯轴30之间形成过盈配合。具体来说，在图2中，芯轴30的与弹簧20相面对的一端形成有芯轴倒角部34，该芯轴倒角部34包括面对弹簧20的小直径端和背对弹簧20的大直径端，其中小直径端的直径小于弹簧20的内径，而大直径端的直径大于弹簧20的内径，由此在将弹簧20装配到芯轴30的过程中，会在弹簧20和芯轴30之间形成过盈配合。
在该实施例中，芯轴30中与弹簧20相配合的部分并不局限于图中所示的芯轴倒角部34的形状，也可采用其它形状或其它装配方法。举例来说，可将芯轴30设置成整体直径都略大于常温状态下弹簧20的内径，而在装配过程中，对弹簧20的至少一部分加热，例如浸浴在热油中，然后将弹簧20套设到芯轴30上。随着弹簧20冷却，由于热胀冷缩的效应，弹簧20的内径缩小，从而过盈配合在芯轴30上。
现有技术中的其它过盈装配方法也可用于弹簧20和芯轴30之间的装配。
<第三实施例>
图3中示出了本发明的第三实施例的排气装置1。下面将主要描述第三实施例与第一和第二实施例之间不同的特征。除此之外，除非有相反的表述，在第一和第二实施例中所描述的内容同样适用于第三实施例，在此不再作详细说 明。
如图3所示，在第三实施例的排气装置1中，芯轴30上同样设置有弹簧凹槽33，用于接纳弹簧20，以将弹簧20连接到芯轴30上。与第一实施例不同的是，在第三实施例中，弹簧凹槽33是螺纹槽的形式。较佳地，该螺纹槽中螺纹的节距与弹簧20的各匝之间的节距基本相匹配，由此可对弹簧20中配合到该螺纹槽内的各匝分别进行固定，从而使弹簧20和芯轴30之间的配合更加牢固。

Claims (14)

  1. 一种轮胎模具的排气装置，所述排气装置包括：
    外套，所述外套中形成有内腔，且所述内腔在所述外套的第一端处开口；
    芯轴，所述芯轴容纳在所述内腔中，且在所述芯轴的第一端处形成有轴头，所述芯轴能够沿着所述外套的轴向在第一位置和第二位置之间运动，在所述第一位置处，在所述轴头和所述外套之间形成有间隙，在所述第二位置处，所述轴头和所述外套之间密封配合；以及
    弹簧，所述弹簧与所述芯轴相连接，并向所述芯轴施加偏置力，将所述芯轴向着所述第一位置偏置，
    其特征在于，所述弹簧连接在所述芯轴上，并且，在所述内腔中形成有第一限制部和第二限制部，其中，所述第一限制部形成在所述内腔内，当所述芯轴达到所述第一位置时，所述第一限制部与所述弹簧和/或所述芯轴相接触，阻止所述芯轴进一步朝向所述外套的所述第一端的运动，所述第二限制部形成在所述内腔中靠近或位于所述外套的所述第二端的位置处，并支承所述弹簧，以限制所述弹簧朝向所述外套的第二端的运动。
  2. 如权利要求1所述的排气装置，其特征在于，所述第一限制部为设置在所述内腔中的台阶部；和/或
    所述第二限制部为形成在所述外套的所述第二端处的缩口部，所述缩口部的内径小于所述弹簧的所述第二端的外径。
  3. 如权利要求1所述的排气装置，其特征在于，所述弹簧的一端过盈配合在所述芯轴上。
  4. 如权利要求1所述的排气装置，其特征在于，在所述芯轴上形成有凹槽，所述弹簧的一端配合在所述凹槽中，从而将所述弹簧固定在所述芯轴上。
  5. 如权利要求4所述的排气装置，其特征在于，所述凹槽为螺旋槽。
  6. 如权利要求1所述的排气装置，其特征在于，所述轴头上形成有第一锥面，所述外套的所述第一端上形成有第二锥面，所述第一锥面和所述第二锥面的形状互相匹配。
  7. 如权利要求1所述的排气装置，其特征在于，所述内腔中包括小直径部，所述小直径部的内径小于所述内腔中的其余部分的内径，所述芯轴的第二端伸入或延伸穿过所述小直径部；所述弹簧连接在所述芯轴的所述第二端上。
  8. 如权利要求7所述的排气装置，其特征在于，在所述芯轴的与所述小直径部相配合的部分的外周面上设置有至少一个通气槽部。
  9. 如权利要求7所述的排气装置，其特征在于，在所述小直径部的靠近所述外套的所述第二端一侧的端部处形成有所述内腔的所述台阶部，当所述芯轴运动到所述第一位置时，所述内腔的所述台阶部与所述芯轴的所述第二端和/或与所述弹簧相接触，以所述阻止所述芯轴进一步朝向所述外套的所述第一端的运动。
  10. 如权利要求9所述的排气装置，其特征在于，在所述芯轴的所述第二端上形成有芯轴台阶部，当所述芯轴运动到所述第二位置时，所述芯轴台阶部与所述内腔的所述台阶部相抵靠，阻止所述芯轴进一步朝向所述外套的所述第一端的运动；以及
    至少所述芯轴的所述第二端由弹性材料制成。
  11. 一种轮胎模具，所述轮胎模具中设有至少一个排气孔，其特征在于，所述排气孔中安装有如权利要求1-10中任一项所述的排气装置。
  12. 一种组装如权利要求1-10中任一项所述的排气装置的方法，其特征在于，所述方法包括如下步骤：
    提供所述外套、所述弹簧和所述芯轴；
    将所述弹簧从所述外套的所述第一端或所述第二端插入所述外套的所述内腔中；
    将所述弹簧连接到所述芯轴上；以及
    将所述芯轴从所述外套的所述第一端插入所述外套的所述内腔中。
  13. 如权利要求12所述的方法，其特征在于，在未插入所述弹簧之前，所述外套的所述第二端处于未收缩状态，从所述外套的所述第二端将所述弹簧插入所述内腔中，然后再使所述外套的所述第二端的位置处和/或附近部分收缩，形成所述第二限制部，以支承所述弹簧。
  14. 如权利要求12所述的方法，其特征在于，所述弹簧的外直径小于所述 内腔的所述第一端的内直径，由此，在所述方法中，以所述外套的所述第二端收缩而形成所述第二限制部的状态提供所述外套，并且，从所述外套的所述第一端将所述弹簧插入所述内腔中。
PCT/CN2017/093784 2017-02-08 2017-07-21 排气装置、其组装方法及具有该排气装置的轮胎模具 WO2018145406A1 (zh)

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