JPH09290425A - Vulcanizing mold for producing tortional damper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the damage of a sleeve or a mold part caused by the loading inferiority in the loading process of the sleeve to a vulcanizing mold. SOLUTION: When a sleeve 4 is mounted, a sleeve 4 is loosely fitted to the outer periphery of an inner peripheral mold 12 wherein respective split molds 121-124 are held to a mutually closely contact and diameter contracted state by the energizing force of an elastomer 15. Next, a core rod 14 is moved upwardly so that the insertion surface 14a thereof is inserted in the receiving taper surface 12c of the inner peripheral guide mold 12 and the split molds 121-124 are moved so as to be separated toward an outer diameter direction against the tightening force of the elastomer 15 to be brought into contact with the inner peripheral surface of the sleeve 4 to fix the sleeve 4. When the core rod 14 is pulled out of the receiving taper surface 12c after an elastomer is vulcanized to be molded and bonded between the sleeve 4 and an annular mass member 2, the split molds 121-124 are moved in a diameter contracting direction by the energizing force of the elastomer 15 to release the fixed state of the sleeve 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a torsional damper that absorbs torsional vibration of an engine crankshaft,
In particular, the elastomer is vulcanized and molded between the sleeve fitted to the outer peripheral surface of the hub and the annular mass body arranged on the outer periphery thereof.
The present invention relates to a vulcanization mold used for manufacturing a torsion damper having a vulcanization-bonded structure.

[0002]

2. Description of the Related Art In order to effectively absorb the torsional vibration (rotational vibration) generated by the rotation of the crankshaft of an automobile engine, a torsional damper is provided at the end of the crankshaft protruding from the crankcase of the engine. Is installed. As shown in FIG. 4, this type of torsional damper includes a hub 1 fixed to the axial end of the crankshaft.
And a ring-shaped mass body 2 concentrically arranged on the outer peripheral side of the hub 1 elastically connected to each other via a ring-shaped elastomer 3, and a resonance composed of the ring-shaped mass body 2 and the ring-shaped elastomer 3. Since the system resonates at a phase angle different from the vibration of the crankshaft, it has a remarkable damping function mainly against the torsional vibration (vibration in the rotation direction) of the crankshaft.

In the torsional damper shown in FIG. 4, the annular elastomer 3 is integrally vulcanized and molded between the sleeve 4 and the inner peripheral surface of the annular mass 2 concentrically arranged on the outer peripheral side thereof. It is manufactured by fitting the sleeve 4 onto the outer peripheral surface of the hub 1 with a proper tightening margin after the vulcanization. A residual tensile stress is generated in the annular elastomer 3 which is vulcanized and bonded between the annular mass body 2 and the sleeve 4 by vulcanization due to the volume contraction after vulcanization. After that, the hub 1 is attached to the inner circumference of the sleeve 4. By press-fitting and fitting, the sleeve 4 is slightly expanded and deformed so as to compress the annular elastomer 3 in the radial direction, so that the residual tensile stress can be relaxed or eliminated.

Vulcanization molding and vulcanization adhesion of the annular elastomer 3 between the sleeve 4 and the annular mass body 2 have conventionally been performed using a vulcanization molding die 100 as shown in FIG. The vulcanization molding die 100 is an outer peripheral guide die 101 having an annular stepped portion 101a for loading the annular mass body 2, and is concentrically combined with the outer peripheral guide die 101 to load the sleeve 4 on the outer peripheral surface. Which includes an inner peripheral guide die 102 and an upper die 103 which is arranged above the guide dies 101 and 102 and which is moved up and down in the vertical direction.
1, 102, the annular mass body 2 and the sleeve 4 are concentrically loaded with each other, and then the upper mold 103 is lowered to perform mold closing, so that the annular space S between the annular mass body 2 and the sleeve 4 is closed. Vulcanization molding and vulcanization adhesion are performed by filling the elastomer molding material.

[0005]

According to the above-mentioned prior art, the sleeve 4 cannot be properly accommodated in the inner peripheral guide mold 102 due to the thermal expansion of the inner peripheral guide mold 102. For example, as shown by a chain double-dashed line in FIG. It may be fitted diagonally into the. The same thing can happen due to carelessness in work. In most cases, such a state is corrected in the process in which the sleeve 4 is pushed by the descending upper mold 103 at the subsequent mold closing,
It may not be corrected depending on the degree of inclination of the sleeve 4, and in this case, if the upper die 103 is lowered as it is, the sleeve 4 may be damaged or the inner peripheral guide type due to "steering" with the sleeve 4. 102 etc. will be damaged. Therefore, the mold closing operation needs to be performed while carefully checking the loading process of the sleeve 4, resulting in a decrease in work efficiency.

The present invention has been made under the circumstances as described above, and its technical problem is to provide a sleeve, a mold, etc. due to improper loading in the process of loading the sleeve into the vulcanization mold. Is to prevent breakage and improve workability.

[0007]

The above-mentioned technical problems are as follows.
This can be effectively solved by the present invention. That is, the vulcanization mold for producing the torsional damper according to the present invention,
An outer peripheral guide die into which the outer peripheral portion of the annular mass body of the torsional damper is fitted, and a peripheral die arranged concentrically with the outer peripheral guide die and divided into three or more divided die in the circumferential direction, and the respective divided die are in close contact with each other. In the diameter state, the outer diameter is smaller than that of the sleeve arranged on the inner peripheral side of the annular mass body, and the split die is inserted into the axial center portion of the inner peripheral guide die so that the outer diameter of the split mold is increased. And a core rod that separates and moves to the side and contacts the inner peripheral surface of the sleeve.

According to the vulcanizing mold of the present invention, the annular mass body of the torsional damper is fitted into the outer peripheral guide mold, and
The sleeve of the torsional damper is loosely fitted to the outer circumference of the inner circumferential guide die in which the split dies are in close contact with each other. Then, by inserting the core rod into the axial center portion of the inner peripheral guide type, the respective inner peripheral guide type divided dies are separated from each other and moved to the outer diameter side, and abut on the inner peripheral surface of the sleeve. The sleeve can be concentrically fixed to the inner peripheral side of the annular mass body.

Further, in the present invention, more preferably, the inner peripheral guide die is constructed such that the respective divided dies are urged in a diameter reducing direction in which they are in close contact with each other. By doing this, after the elastomer molding material is filled in the annular space between the sleeve and the annular mass body, and after vulcanization molding and vulcanization adhesion of the elastomer,
When the core rod is pulled out from the axial center portion of the inner peripheral guide die, the respective divided dies of the inner peripheral guide die move in the diameter reducing direction and come into close contact with each other to release the fixation to the sleeve, so that the sleeve and the annular mass. The vulcanized molded body composed of the body and the elastomer interposed therebetween can be easily taken out from the mold.

[0010]

1 and 2 show a first embodiment of a vulcanization molding die for producing a torsional damper according to the present invention, which is a bush type as shown in FIG. 4 described above. It is used for vulcanization molding and vulcanization adhesion of the elastomer 3 between the annular mass body 2 and the sleeve 4 in the production of the torsional damper. That is, the vulcanization molding die 10 is concentric with the outer peripheral guide die 11 in which an annular step portion 11a for fitting and loading the outer peripheral portion of the annular mass body 2 is formed and the inner peripheral side of the annular step portion 11a. The inner peripheral guide die 12 is composed of divided dies 121 to 124 which are arranged and are divided into four by 90 ° in the circumferential direction, a support board 13 for movably supporting the inner peripheral guide die 12 in a radial direction, and a support board 13 of the support board 13. A core rod 14 is disposed in an inner peripheral hole formed in an axial center portion so as to be movable up and down and moves the split molds 121 to 124 in a radial direction.

The outer diameter of the inner peripheral guide die 12 is the same as that of each divided die 1.
In the reduced diameter state where 21 to 124 are in close contact with each other,
As shown in, the diameter is appropriately smaller than the sleeve 4 to be loaded. An annular groove 12a continuous in the circumferential direction is formed on the upper surface of the inner circumferential guide die 12 so as to straddle each of the split dies 121 to 124, and each of the split dies 121 is formed in the annular groove 12a. A ring-shaped elastic body 15 is attached to urge the .about. As the elastic body 15, for example, a heat-resistant rubber material or a coil spring connected in an annular shape is used.

In the axial center portion of the inner peripheral guide die 12, there are provided insertion holes 12b each having a receiving taper surface 12c whose lower surface side is open and whose diameter is gradually increased downward.
On the other hand, the core rod 14 which is concentrically arranged below the inner circumferential guide die 12 is formed so as to straddle 24, and has an insertion taper surface 14a formed at the upper end thereof so as to have a smaller diameter toward the upper side. There is. Further, the outer diameter of the lower end portion which is the maximum diameter portion of the insertion tapered surface 14a is larger than the inner diameter of the upper end portion which is the minimum diameter portion of the receiving tapered surface 12c, and the diameter dimensional difference Δφ ₁ between them.
Is set to be larger than the diameter dimensional difference Δφ ₂ between the outer diameter of the inner circumferential guide die 12 and the inner diameter of the sleeve 4 loosely fitted to the outer circumference of the inner circumferential guide die 12 in a state where the split dies 121 to 124 are in close contact with each other. .

To vulcanize and bond an elastomer between the annular mass 2 and the sleeve 4 using the vulcanizing mold 10 having the above-described structure, first, as shown in FIG. The annular mass body 2 is inserted and fitted into the annular stepped portion 11a of the guide die 11, and the sleeves are provided on the outer circumference of the inner peripheral guide die 12 in which the split dies 121 to 124 are in close contact with each other by the urging force of the elastic body 15. 4 is loosely fitted. At this time, the outer diameter of the inner peripheral guide die 12 is smaller than the inner diameter of the sleeve 4 by Δφ ₂ , so that the sleeve 4 can be easily loaded without causing “galling” or the like.

Next, when the core rod 14 is moved upward toward the insertion hole 12b of the inner peripheral guide die 12, the insertion taper surface 14a of the core rod 14 in the process moves into the receiving taper below the insertion hole 12b. Contact the surface 12c. When the ascending movement of the core rod 14 is further continued thereafter, the receiving tapered surface 12c
As the large-diameter end portion side of the insertion tapered surface 14a is inserted into the inside, the split dies 121 to 124 in the inner peripheral guide die 12 that are in close contact with each other are separated as shown in FIG. It is evenly moved to the outer diameter side against the tightening force of 15.

As described above, this insertion taper surface 14
The diameter difference Δφ ₁ between the outer diameter of the lower end portion of a and the inner diameter of the upper end portion of the receiving tapered surface 12c is equal to the outer diameter of the inner circumferential guide die 12 in the state where the split dies 121 to 124 are in close contact with each other and the outer diameter thereof. Since the diameter dimension difference Δφ ₂ from the inner diameter of the sleeve 4 loosely fitted to the outer periphery is larger, the outer peripheral arcuate surface 121a of each of the split dies 121 to 124 that is moved to the outer diameter side by inserting the core rod 14
Eventually, 124 a contacts the inner peripheral surface of the sleeve 4. Therefore, the sleeve 4 is firmly fixed to the outer peripheral surface of the inner peripheral guide die 12, and in the initial loose fitting state, even if the sleeve 4 is eccentric, it is corrected to the concentric position.

After loading the sleeve 4 and the annular mass body 2 as shown in FIG. 2, an upper die (not shown) arranged above the inner circumferential guide die 12 is lowered to close the die. At this point, since the sleeve 4 is completely loaded on the outer peripheral surface of the inner peripheral guide die 12, as in the case of pushing the sleeve 4 into the outer peripheral surface of the inner peripheral guide die 12 during the mold closing process, The sleeve 4 and mold parts are not damaged. After the mold is closed, the annular space S between the sleeve 4 and the annular mass body 2 is filled with an elastomer molding material (not shown), and the elastomer is vulcanized and vulcanized and bonded.

After the vulcanization molding and vulcanization adhesion of the elastomer between the sleeve 4 and the annular mass body 2 are completed, the upper die is raised and the core rod 14 is lowered to insert the tapered taper surface 14a at the upper end thereof. The receiving taper surface 12 of the inner peripheral guide die 12
pull out from c. Along with this, the split dies 121 to 124 of the inner circumferential guide die 12 move in the diameter reducing direction due to the urging force of the elastic body 15 and come into close contact with each other, so that they are in contact with the sleeve 4 as shown in FIG.
Since a gap corresponding to Δφ ₁ is formed, the vulcanized molded body composed of the sleeve 4, the annular mass body 2 and the annular elastomer vulcanized and bonded between them can be easily taken out. In this vulcanized molded body, a hub is then press-fitted onto the inner circumference of the sleeve 4 to produce a torsional damper as shown in FIG.

FIG. 3 shows a second embodiment of the vulcanization molding die for producing a torsional damper according to the present invention. The difference from the first embodiment is that each of the inner circumference guide die 12 is different. As a means for urging the split dies 121 to 124 in a radially contracting direction in close contact with each other, the support surface of the support board 13 that supports the inner guide 12 is tapered into a tapered recessed surface 1 on the inner circumference side.
3a, and the lower surface of the inner peripheral guide die 12 supported by this is a tapered convex surface 12d corresponding to the tapered concave surface 13a.
And that That is, each of the split dies 121 to 124 forming the inner circumference guide die 12 is supported by the support plate 1 by gravity.
Since the taper-shaped recessed surface 13a of No. 3 tries to move toward the inner peripheral side, which is the lower side thereof, it is urged in the diameter reducing direction.

Therefore, in order to perform vulcanization molding and vulcanization bonding of the elastomer between the annular mass body 2 and the sleeve 4 by using the vulcanization molding die 10 of the second embodiment, the above first method is used. Similar to the case according to the embodiment, first, the annular mass body 2 is inserted into the annular stepped portion 11a of the outer peripheral guide die 11 and loaded, and the divided dies 121 to 124 are in the reduced diameter state in which they are in close contact with each other. After the sleeve 4 is loosely fitted to the outer circumference of 12, the core rod 14 is moved upward toward the insertion hole 12b of the inner circumference guide die 12. The insertion taper surface 14a of the core rod 14 is the receiving taper surface 12c below the insertion hole 12b.
As a result of being inserted into the inner peripheral guide die 12, the split dies 121 to 124 of the inner peripheral guide die 12 are tapered.
Since the upper surface a is pushed up to the outer peripheral side, which is the higher side, and moves away from each other, each arcuate surface 121a on the outer peripheral side is moved.
~ 124a eventually contacts the inner peripheral surface of the sleeve 4, and firmly fixes the sleeve 4.

Next, the upper die (not shown) arranged above the inner circumferential guide die 12 is lowered to close the die, and then the elastomer is molded in the annular space S between the sleeve 4 and the annular mass body 2. After the vulcanization molding and vulcanization adhesion are performed by filling the material for molding (not shown), the upper die is raised and the core rod 14
By lowering the insertion taper surface 14 at its upper end.
When "a" is extracted from the receiving tapered surface 12c of the inner peripheral guide die 12, the divided dies 121 to 1 of the inner peripheral guide die 12 are accompanied with this.
Since 24 moves away from the inner peripheral surface of the sleeve 4 and slides down on the tapered recessed surface 13a of the support board 13 toward the inner peripheral side that is the lower side thereof, and they are in close contact with each other, the sleeve 4 and the annular mass It is possible to easily take out the vulcanized molded body composed of the body 2 and the elastomer vulcanized and bonded between them.

The present invention should not be limitedly interpreted by the illustrated embodiments. For example, inner circumference guide type 12
Is not limited to the four-divided shape as shown in the figure, and may be a divided shape of three or more divisions.

[0022]

According to the present invention, the following effects are realized. (1) In the inner circumference guide type, the sleeves of the torsional dampers are loosely fitted in a reduced diameter state where the divided dies are brought into close contact with each other, and then the divided dies are moved to the outer peripheral side to move the sleeves. Since it is fixed, it does not cause "galling". (2) Since the loading of the sleeve is completed before the mold is closed, the sleeve and the mold components are not damaged during the mold closing process. (3) Since the mold closing operation does not need to be performed while carefully checking the sleeve loading process, the work efficiency is improved. (4) It is easy to take out the molded product after the molding is completed.

[Brief description of drawings]

FIG. 1 shows a reduced diameter state of an inner peripheral guide die together with an annular mass body and a sleeve in a first embodiment of a vulcanization forming die for producing a torsional damper according to the present invention.
Is a half-cut sectional view of a main part, and FIG.

2A and 2B show a state of a sleeve of an inner peripheral guide type in the above embodiment together with an annular mass body and the sleeve, wherein FIG. 2A is a half cutaway view of a main part, and FIG. 2B is a plan view of the main part.

FIG. 3 is a half-cut cross-sectional view of an essential part showing a reduced diameter state of an inner circumferential guide die together with an annular mass body and a sleeve in a second embodiment of a vulcanization forming die for producing a torsion damper according to the present invention.

FIG. 4 is a half-cut sectional view showing an example of a torsional damper.

FIG. 5 is a partial cross-sectional view showing a conventional vulcanization mold for producing a torsional damper together with an annular mass body of the torsional damper and a sleeve.

[Explanation of symbols]

 2 annular mass body 4 sleeve 10 vulcanization molding die 11 outer circumference guide die 11a annular step portion 12 inner circumference guide die 12a annular groove 12b insertion hole 12c receiving tapered surface 12d tapered convex surface 121 to 124 splitting mold 121a to 124a arcuate surface 13 support Board 13a Tapered depression surface 14 Core rod 14a Insertion tapered surface 15 Elastic body

Claims (2)

[Claims] 1. An annular mass body (2) of a torsional damper
An outer peripheral guide die (11) into which an outer peripheral part of the outer peripheral portion is fitted, and a circumferential direction 3 arranged concentrically with the outer peripheral guide die (11).
A sleeve (4) which is divided into at least two split molds (121 to 124) and whose outer diameter is arranged on the inner peripheral side of the annular mass body in a reduced diameter state in which the split molds (121 to 124) are in close contact with each other. The inner peripheral guide die (12) having a smaller diameter, and the sleeves by being inserted into the axial center portion of the inner peripheral guide die (12) to separate and move the split dies (121 to 124) to the outer diameter side. A vulcanization molding die for producing a torsion damper, comprising: a core rod (14) which is brought into contact with the inner peripheral surface of (4). 2. The inner peripheral guide die (12) according to claim 1, wherein the inner peripheral guide die (12) is a divided die (121-12).
4) A vulcanization mold for producing a torsional damper, characterized in that the urging members 4) are urged in a diameter-reducing direction in close contact with each other.