JPH0533793Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to an improvement of a torsional damper that is attached to a rotating shaft such as a crankshaft of a diesel engine in order to damp the torsional vibration thereof.

[Prior art]

As shown in FIG. 3, a conventional damper 1 of this type has ring-shaped rubber disks 3, 3a having excellent vibration damping properties and fatigue resistance on the outer periphery of both sides of a disk-shaped plate 2 having a central opening 2a. is attached by gluing, baking, etc., and the weight housings 4, 4a are attached to the outside thereof, and the plate 2, the rubber disks 3, 3a, and the weight housings 4, 4 are attached.
A viscous fluid 5 such as silicone oil is sealed in the gap provided between the crankshaft 6 and the crankshaft 6, and is attached to the end of the crankshaft 6 to absorb and damp torsional vibrations. (For example, Utsukai 56-
(See Publication No. 2446, etc.)

By the way, natural rubber or butyl rubber is generally used as the material for the rubber disks 3, 3a, but while these natural rubbers have excellent vibration damping properties and fatigue resistance, they lack heat resistance. have.

On the other hand, with the tightening of noise regulations, the shielding of the engine has been expanded, and as a result, the temperature of the rubber disks 3, 3a increases as the engine ambient temperature increases, resulting in thermal deterioration.

As a countermeasure against this problem, conventionally, as shown in FIG. 4, the rubber disks 30, 30a are arranged with rubber disks 31, 31a located on the outer periphery and having excellent vibration damping properties and fatigue resistance, and rubber disks 31, 31a located on the inner periphery. The rubber disks 30, 30a are constructed in a double structure with highly heat-resistant covering rubbers 32, 32a, and the end surfaces of the rubber disks 30, 30a are thermally shielded (for example, in practical applications). Showa 57
-Refer to Publication No. 125611, etc.).

In such a torsional damper,
Rubber disk 31, 31a using covered rubber 32, 32a of the same width as rubber disk 31, 31a,
Although the inner peripheral surface of 31a is vulcanized and bonded, the adhesive strength between the bonded surfaces is relatively weak.

When we examine the cause of this problem, we find that air tends to accumulate between the bonded surfaces during vulcanization bonding, which makes it difficult to obtain sufficient bond strength and causes the problem of easy peeling due to external forces. found.

As described above, the adhesive strength of the coated rubber 32, 32a is low, and if the coated rubber 32, 32a peels off during use, the end surfaces of the rubber disks 31, 31a are exposed to high temperatures, and in particular, the weight housing 14,
It has been confirmed that cracks occur at the corners where the rubber disks 14a and the rubber disks 31, 31a are bonded.

Furthermore, Japanese Utility Model Application Publication No. 125611/1983 proposes a torsional damper in which a rubber disk with excellent weather resistance is provided on the inner diameter surface of a rubber disk that connects the plate and the weight housing.

However, this weather-resistant rubber has lower elongation and poorer adhesion than rubber disks, which have better vibration damping and fatigue resistance. Moreover, in this damper, the weather-resistant rubber and the rubber disk are made of equal width, and one end of the rubber disk is adhered to the surface of the plate, and the other end is adhered to the inner surface of the weight housing. There is a problem in that the end of the rubber that moves together with the weight housing is likely to peel off because it is not bonded so as to extend to and cover the weight housing. When this rubber peels off, the inner circumferential surface of the rubber disk is exposed to gas and oil etc. adhere to it, causing a problem that cracks occur in the bond between the corners of the rubber disk and the plate.

Furthermore, Japanese Utility Model Application No. 58-130150 proposes a torsional damper in which a seal plate is provided to cover the inner peripheral surface of a rubber disk. However, although one end of the seal plate of this torsional damper is bonded to the plate side, the other end is merely supported by being in contact with the inner circumferential surface of the weight housing.

Therefore, although the inner circumferential surface of the rubber disk is covered by this sealing plate, since the inner circumferential surface of the rubber disk and this sealing plate are not bonded, the inner circumferential surface of the rubber disk Gas, oil, etc. will enter the surface, and there is still the problem that the adhesive surface of the rubber disk, especially the corner portions, is susceptible to cracking due to the influence of this gas.

Furthermore, Japanese Patent Application Laid-Open No. 54-158581 proposes a torsional damper in which a covered rubber is provided covering the inner peripheral surface of a rubber disk, but one end of this covering rubber is glued to a plate and the other end is is in contact with the corner of the inner periphery of the weight housing.

The rubber cover of this device has the other end cut into a V-shaped fork and simply contacts the inner corner of the weight housing, so that sand and dust do not come into contact with the end of the rubber disk. However, unlike the present invention, it is not adhered to the rubber disk in a laminated state. Therefore, there is almost no adhesion between the rubber disk and the covering rubber, and there is no function to protect the end portion of the rubber disk from gas, so it does not significantly contribute to extending the life of the rubber disk.

[Purpose of invention]

The present invention was developed in order to solve the problems of the known technology, and is based on a rubber disk with excellent vibration damping properties and fatigue resistance, and a heat resistant rubber disk provided on the inner circumferential surface of the rubber disk. In addition to fully adhering the rubber disk to the rubber disc, one end of the rubber cover is adhered to the plate surface and the other end is adhered to the inner circumferential surface of the weight housing, making it possible to completely protect the inner circumferential surface of the rubber disc. The purpose is to provide a torsional damper.

[Summary of the idea]

To achieve the above object, the torsional damper according to the present invention supports a weight housing via an annular rubber disk on both sides of a disk-shaped plate supported by a rotating shaft, and the plate, the rubber disk, and the weight housing are connected to each other. In the torsional damper in which viscous fluid is sealed in a space surrounded by
This slope is covered with a heat-resistant covering rubber that extends to the surface of the plate.

The rubber disk that constitutes the main component of the torsional damper has vibration damping properties and fatigue resistance, but it has relatively poor heat resistance.This invention has heat resistance to compensate for this drawback. Covered rubber is laminated on the inner peripheral surface of the rubber disk.

The inner circumferential surface of the rubber disk repeatedly expands and contracts as a result of the relative damper movement between the plate and the weight housing, but during this movement the part that is bonded to the plate and weight housing peels off. At the same time, the coated rubber, which has little elongation, also peels off or breaks, exposing the rubber disk to high temperatures and gases, reducing its durability.

In order to solve this problem, the present invention forms the weight housing and the inner circumferential end surface of the rubber disk into a continuous annular inclined surface, thereby giving the rubber disk a shape that is easily stretchable as a whole. Furthermore, by bonding a heat-resistant covering rubber in a laminated state along this annular inclined surface, the width of this covering rubber is widened, making it easy to expand and contract, thereby eliminating the generation of local stress. It has a highly durable structure that provides heat resistance and gas barrier properties.

Extending the end of the covered rubber to the end of the weight housing to form an annular inclined surface is effective in the step of laminating and bonding the rubber disk and the covering rubber on both sides of the plate.

Specifically, a rubber disk and a covering rubber are placed on both sides of the plate, and pressure is applied using a heated mold to perform primary vulcanization, and then a weight housing is placed on the rubber disk bonded to the plate and pressurized. Secondary vulcanization is performed. In this case, since the end surface of the rubber disk is formed as an inclined surface, when the coated rubber is laminated and pressed, air is squeezed out from the contact surface, preventing air from entering between the two rubbers. , good adhesion can be obtained.

Therefore, the rubber disk of the plate and the covered rubber are firmly bonded, the rubber disk, the covered rubber and the weight housing are firmly bonded, and especially the covered rubber and the rubber disk are firmly bonded.

Furthermore, both ends of this covered rubber extend beyond the sloped surface of the rubber disk and are bonded to the plate on the inside and to the end face of the weight housing on the outside, so the rubber disk and the covered rubber are firmly bonded. In addition, this covering rubber is firmly adhered to the plate and weight housing, and will not peel off.

Vulcanization adhesion between the rubber disk and the covered rubber is carried out in two steps, but in the primary vulcanization adhesion, the rubber disk is placed on the surface of the plate, the covered rubber is placed on the inner peripheral end surface of the rubber disk, and the rubber disk is pressed onto the plate, and a covering rubber is also pressed onto the end face of the inner periphery of this rubber disk to bond it by vulcanization.

In the secondary vulcanization bonding, vulcanization bonding of the rubber is completed by vulcanization bonding with the weight housing pressed against the side surface of the rubber disk (the surface opposite to the plate) and the covered rubber.

〔Example〕

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows a sectional view of the torsional viscous damper 10 of the present invention. First, a weight housing is attached to both sides of the outer circumference of a plate 12 fixed on a crankshaft 11 via rubber disks 13, 13a. Covering rubbers 15, 15a are provided to cover the inner peripheral end surfaces of the rubber disks 13, 13a and the inner peripheral end surfaces of the weight housings 14, 14a. A viscous fluid 16 is sealed in a gap provided between the plate 12, the rubber disks 13, 13a, and the weight housings 14, 14a.

The rubber disks 13, 13a are made of a material with high vibration damping properties and fatigue resistance, and are covered with rubber discs 13, 13a.
5 and 15a are made of a material with high heat resistance.

Rubber disks 13, 13a and covered rubber 1
The step of vulcanizing and adhering 5, 15a is carried out in two steps, but in the primary vulcanizing and adhering step, the bonding surface A between the plate 12 and the rubber disks 13, 13a, and the bonding surface A between the covered rubber 15, 15a and the rubber disk. 13, 13a and the covering rubber 1
5, 15a and the plate 12 form an adhesive surface C.

In the secondary vulcanization bonding process, the weight housings 14, 14a and the rubber disk 13,
13a and the weight housing 1
Inner peripheral end surfaces of 3 and 13a and covering rubber 15 and 15a
Form an adhesive surface with the

In the primary vulcanization adhesion and secondary vulcanization adhesion processes, it goes without saying that predetermined positions are pressed by a vulcanization mold in the usual manner, but the covering rubber 15, 15a is pressed in the secondary vulcanization adhesion process. Rubber disk 1
3, 13a inner peripheral end face and weight housing 1
The rubber disks 13, 1 are pressed against the inner circumferential end surfaces of the rubber disks 13, 14a to strongly form adhesive surfaces (R) and (E).
This is effective in strengthening the adhesion between 3a and the covering rubber 15, 15a.

FIG. 2 shows another embodiment, in which a step or notch 17 is formed on the inner peripheral end surface of the weight housing 14, 14a, and the covered rubber 14, 14a is accommodated in this notch 17. Covered rubber 15, 15a is weight housing 14, 14a
It adopts a structure that is more difficult to peel off.

Furthermore, heat-resistant rubber such as silicone rubber, fluorine rubber, chlorine butyl rubber, etc. is used as the covering rubber 15, 15a. The thickness is preferably 1 to 5 mm in view of material savings and thermal deterioration.

The torsional damper 10 according to the present invention includes:
In particular, the inner peripheral end surfaces of the rubber disks 13, 13a are covered with covered rubber 15, 15a, and this covered rubber 1
5, 15a are extended to the inner peripheral end surfaces of the weight housings 14, 14a and are bonded.

Therefore, the torsional vibrations caused by the rotation of the crankshaft 11 are damped by the coated rubber disks 13, 13a, the weight housings 14, 14a, and the viscous fluid 15.

Furthermore, the coated rubber 15, 15a is formed wide so that its outer peripheral surface is bonded to the inner peripheral end surface of the weight housings 14, 14a and the rubber distal 13, during secondary vulcanization.
Since the adhesive surfaces E and B are formed by pressing against the inner circumferential end surface of the covering rubber 15, 13a, the air on the adhesive surface is completely removed and sufficient adhesive strength is obtained.
There is no possibility that a will peel off due to external force.

In addition, in the present invention, the covering rubber 15, 1
5a is extended and bonded to the inner circumferential end surfaces of the weight housings 14, 14a, so that the bonding between the covering rubbers 15, 15a is strong.

[Effect of idea]

As explained above, the torsional damper according to the present invention supports a weight housing via an annular rubber disk on both sides of a disk-shaped plate supported by a rotating shaft, and connects the plate, the rubber disk, and the weight housing. In a torsional damper in which a viscous fluid is sealed in an enclosed space, the weight housing and the inner peripheral end surface of the rubber disk are formed into a continuous annular inclined surface, and a heat-resistant coating that covers this inclined surface and extends to the surface of the plate. It is constructed by gluing rubber and has the following effects.

(1) The inner peripheral surface of the rubber disk, which has vibration damping properties and fatigue resistance, is covered with a heat-resistant coating rubber, and this rubber disk is not directly exposed to high heat or hot gas.

(2) The inner peripheral end surfaces of the weight housing and the rubber disk form an annular inclined surface, and the covered rubber is laminated on this inclined surface with the covering extending beyond both sides of the rubber disk, and this is applied to the surface of the plate. Since the weight housing can be vulcanized by being pressed against the inner circumferential end surface of the weight housing, there is no possibility that air will enter between the rubber disk and the covering rubber and weaken the adhesive strength. Furthermore, since the covering rubber extends to the inner circumferential end surface of the weight housing and is bonded thereto, the adhesive strength is extremely strong, and the covering rubber will not peel off.

(3) Since the covering rubber is formed in the shape of an annular inclined surface, it follows the movement of the damper member well. Furthermore, since the covering rubber can be pressed against the inner circumferential end surface of the rubber disk during vulcanization, workability is good and the bond between the two is strong.

Therefore, a durable torsional damper can be efficiently manufactured.

Since this covered rubber is firmly bonded and thermally protects the rubber dehesku, the bonded corner between the rubber disk and the weight housing is not damaged and cracks can be prevented from forming in the rubber disk.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of the main part showing an embodiment of the torsional damper of the present invention, Fig. 2 is a cross-sectional view of the main part showing a modification thereof, and Figs. 3 and 4 are main parts of a conventional example. FIG. DESCRIPTION OF SYMBOLS 10... Torsional damper, 11... Crankshaft, 12... Plate, 13, 13a... Rubber disc, 14, 14a... Weight housing, 15, 15a... Covering rubber, 16... Viscous fluid.

Claims (1)

[Claims for Utility Model Registration] A weight housing is supported via annular rubber disks on both sides of a disk-shaped plate supported by a rotating shaft, and a viscous fluid is contained in a space surrounded by the plate, the rubber disk, and the weight housing. In the torsional damper, the weight housing and the inner circumferential end surface of the rubber disk are formed into a continuous annular inclined surface, and a heat-resistant covering rubber is bonded to cover this inclined surface and extend to the surface of the plate. torsional damper.