JPH0565506U - Vulcanization mold for torsional damper - Google Patents

Abstract

(57) [Summary] [Purpose] A vulcanization mold for torsional dampers that allows highly accurate centering and positioning of the vibration ring regardless of the machining tolerance of the outer peripheral dimension and good clamping regardless of the machining tolerance of the width dimension. provide. A vulcanization molding die of a torsional damper in which a space between the outer circumference of the sleeve 6 and the inner circumference of the vibration ring 7 is filled with elastic rubber and vulcanized and adhered, and is fitted to the inner circumference of the sleeve 6. Then, the lower mold 2 for centering and positioning the same, the middle mold 3 having the collet 8 for centering and positioning the outer circumference of the vibrating ring 7, and the slope contact for giving a gripping force to the collet 8. It has an extender 9 movably held in a direction orthogonal to the radial direction of the collet 8 and an upper die 4 for sandwiching the vibrating ring 7 with the middle die 3 in the width direction. A vulcanization mold of the characteristic torsional damper.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a vulcanization molding die for a torsion damper for vulcanizing and adhering elastic rubber between the outer circumference of a sleeve and the inner circumference of a vibration ring.

[0002]

[Prior Art]

 Conventionally, a vulcanization molding die 20 shown in FIG. 3 is known as a vulcanization molding of a bush type torsional damper in which elastic rubber is vulcanized and bonded between the outer circumference of the sleeve and the inner circumference of the vibration ring. ..

The vulcanization mold 20 is fitted on the outer periphery of a vibration ring 23 and a lower mold 22 having a guide cylinder portion 22 a for fitting the inner periphery of a sleeve 21 to center and position the sleeve 21. It is mainly composed of a middle die 24 having a guide hole 24a for centering and positioning, and an upper die 25 for sandwiching both ends of the vibration ring 23 together with the middle die 24. The upper die 25 is inserted into the cylinder 25a of the upper die 25. The elastic rubber material is filled into the space between the outer circumference of the sleeve 21 and the inner circumference of the vibrating ring 23 from the injection hole 25b by pressurizing the piston 26 and vulcanizing and adhering it. ..

[0004]

[Problems to be solved by the device]

 By the way, the vulcanization molding die 20 has a structure in which the outer circumference of the vibration ring 23 is fitted into the guide hole 24a of the middle mold 24 and is centered and positioned. The diameter of the guide hole 24a is the same as the vibration ring 23. It is set so that it can be fitted even when it takes the maximum value in consideration of the processing tolerance of the outer diameter dimension of. Therefore, when the outer diameter of the vibrating ring 23 is the minimum value of the machining tolerance, or when the diameter of the guide hole 24a is increased due to wear, a gap is created between the guide hole 24a and the vibrating ring 23. As a result, the vibration ring 23 is misaligned, which causes a problem that it takes time to balance the vulcanized torsional damper in the post-process.

Therefore, the present invention is a vulcanization molding of a torsional damper capable of accurately centering the vibration ring regardless of the machining tolerance of the outer diameter dimension and satisfactorily clamping the die regardless of the machining tolerance of the width dimension. It is intended to provide a type.

[0006]

[Means for Solving the Problems]

 For this purpose, the vulcanization mold of the torsion damper according to the present invention is a vulcanization mold for a torsion damper in which the space between the outer circumference of the sleeve and the inner circumference of the vibration ring is filled with elastic rubber and vulcanized and bonded. A die that fits on the inner circumference of the sleeve to center and position it, a middle die that has a collet that grips the outer circumference of the vibration ring and centers and positions it, and a gripping force on the collet. In order to provide the upper mold with an extender that is in contact with the slope and is movably held in the direction orthogonal to the radial direction of the collet, and that sandwiches the vibration ring from the width direction with the middle mold. Is provided as a means.

[0007]

[Action]

 In the vulcanization mold for torsional dampers that employs such means, the lower mold fits on the inner circumference of the sleeve and is centered and positioned, and the upper mold extender elastically makes slope contact with the collet. By doing so, the collet holds the outer circumference of the vibrating ring and centers and positions it. Then, the space between the outer circumference of the sleeve and the inner circumference of the vibrating ring, which are centered and positioned, is filled with elastic rubber and vulcanized and bonded.

Since the outer periphery of the vibrating ring is gripped by the collet and centered and positioned, the vibrating ring is centered and positioned with high accuracy regardless of the machining tolerance of the outer diameter dimension. Therefore, the vulcanization-molded torsional damper has no misalignment, and the work time for balancing in the subsequent process is shortened.

Further, since the extender is movably held in the direction orthogonal to the radial direction of the collet, that is, in the width direction of the vibrating ring, the vibrating ring is divided into the upper die and the middle die regardless of the processing tolerance of the width dimension. It is clamped in and clamped properly. Therefore, it is possible to prevent so-called rubber rotation, in which the elastic rubber squeezes out to an unnecessary portion.

[0010]

【Example】

 Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. In FIG. 1, which shows a sectional structure of a vulcanization molding die 1 for a torsion damper according to an embodiment, reference numeral 2 is a lower die, 3 is a middle die, 4 is an upper die, 5 is a piston, 6 is a sleeve, and 7 is vibration. Each ring is shown.

The lower die 2 has a guide tube portion 2 a protruding from the center thereof, and the middle die 3 is joined to the lower die 2 by being fitted to the lower portion of the guide tube portion 2 a. The sleeve 6 is fitted and positioned on the upper portion of the guide tube portion 2a in a state of being superposed on the middle die 3. The vibrating ring 7 is arranged around the sleeve 6 with a predetermined space filled with elastic rubber, and the vibrating ring 7 is mounted on the middle mold 3.

An upper die 4 is joined to the middle die 3 and the lower die 2, and the vibration ring 7 and both ends of the sleeve 6 are sandwiched between the upper die 4 and the middle die 3. The upper mold 4 is formed with a cylinder 4a into which the piston 5 is fitted, and an injection hole 4b which connects the inside of the cylinder 4a into a predetermined space between the outer circumference of the sleeve 6 and the inner circumference of the vibration ring 7. Is made.

Here, a collet 8 for fixing the outer circumference of the vibrating ring 7 and centering the vibrating ring 7 is fixed on the middle die 3. This collet 8 has a plurality of slit grooves 8a formed in the circumferential direction as shown in FIG. 2 so that the diameter can be reduced in the radial direction, and the outer diameter of the vibration ring 7 is at the maximum value of the working tolerance. In this case and at the minimum value, the outer circumference of the vibration ring 7 can be gripped.

On the other hand, the upper die 4 is provided with a ring-shaped extender 9 in which an inner peripheral taper portion 9a that is in contact with the outer peripheral taper portion 8b of the collet 8 is formed. The extender 9 is fitted in the ring groove 4c formed in the upper die 4 and is movable in a direction orthogonal to the radial direction of the collet 8, that is, in the vertical direction along the width direction of the vibrating ring 7. The coil spring 10 installed in the ring groove 4c constantly urges the downward direction.

Next, the operation of the vulcanization molding die 1 of the torsion damper having the above-described configuration will be described along with an example of its use. First, regarding the mold assembly, it is fitted into the guide cylinder portion 2a of the lower mold 2 to join the middle mold 3 onto the lower mold 2, and in this state, the sleeve 6 is fitted into the guide cylinder portion 2a of the lower mold 2. To determine the centering position. The vibrating ring 7 is fitted on the inner circumference of the collet 8 and placed on the middle mold 3. Subsequently, the upper mold 4 is joined to the lower mold 2 and the middle mold 3, and the extender 9 is set so as to be in contact with the collet 8 on an inclined surface by the urging force of the coil spring 10 to reduce the diameter.

By doing so, the collet 8 holds the vibrating ring 7 with a constant gripping force regardless of the machining tolerance of the outer peripheral dimension thereof, and centers and positions the vibrating ring 7 with high accuracy. Further, since the extender 9 is elastically movable in the vertical direction, the upper die 4 and the middle die 3 securely sandwich both ends of the vibrating ring 7.

After such a die assembly, an elastic rubber material is put into the cylinder 4 a of the upper die 4, and this is pressurized by the piston 5 to fill the outer periphery of the sleeve 6 and the vibrating ring 7 from the injection hole 4 b. It is filled in a predetermined space formed between the circumference and the vulcanization of the elastic rubber. At this time, since the vibrating ring 7 is securely sandwiched between the middle mold 3 and the upper mold 4 as described above, the so-called rubber rotation in which the injected elastic rubber sticks out to unnecessary portions is prevented. .. Further, since the vibrating ring 7 is centered and positioned with high accuracy by the collet 8, the vulcanized and torsional damper has no misalignment and the work time for balancing in the subsequent process is shortened.

[0018]

[Effect of the device]

 As described above, according to the present invention, the lower die is fitted to the inner circumference of the sleeve to center and position it, and the extender of the upper die elastically comes into contact with the collet at a slanted surface, so that the collet moves in the vibration ring. The outer circumference is gripped and centered and positioned. The space between the outer circumference of the sleeve and the inner circumference of the vibrating ring, which are centered and positioned, is filled with elastic rubber and vulcanized and bonded.

Since the outer periphery of the vibrating ring is held by the collet and centered and positioned, the vibrating ring can be centered and positioned with high accuracy regardless of the machining tolerance of the outer peripheral dimension. Therefore, the vulcanization-molded torsional damper has no misalignment, and the work time for balancing in the subsequent process is shortened.

Further, since the extender is movably held in the direction orthogonal to the radial direction of the collet, that is, in the width direction of the vibrating ring, the vibrating ring is divided into the upper die and the middle die regardless of the processing tolerance of the width dimension. It is clamped in and clamped properly. Therefore, it is possible to prevent so-called rubber rotation, in which the elastic rubber squeezes out to an unnecessary portion.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a vulcanization mold for a torsion damper according to the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a cross-sectional view showing a conventional example of a vulcanization molding die for a torsion damper.

[Explanation of symbols]

 1, 20 ... Vulcanization mold 2, 22 ... Lower mold 2a, 22a ... Guide cylinder part 3, 24 ... Middle mold 4, 25 ... Upper mold 4a, 25a ... Cylinder 4b, 25b ... Injection hole 4c ...... ring groove 5,26 ...... piston 6,21 ...... sleeve 7,23 ...... vibration ring 8 ...... collet 8a ...... slitting groove 8b ...... outer peripheral taper 9 ...... extender 9a ...... inner circumference Taper part 10 ...... Coil spring 24a ...... Guide hole

Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display area B29K 105: 20 105: 24

Claims (1)

[Scope of utility model registration request] 1. A vulcanization mold of a torsional damper, wherein a space between the outer circumference of the sleeve (6) and the inner circumference of the vibrating ring (7) is filled with elastic rubber and vulcanized and bonded. A lower die (2) fitted to the inner circumference of 6) for centering and positioning it, and a middle die (3) having a collet (8) for gripping the outer circumference of the vibrating ring (7) and centering and positioning it. And an extender (9) elastically held in contact with the collet (8) in a direction orthogonal to the radial direction of the collet (8) so as to give a gripping force to the collet (8), and A vulcanization molding die for a torsion damper, comprising: an upper die (4) for sandwiching the vibrating ring (7) in the width direction between the die and the die (3).