JP2878741B2 - Torsional damper - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a crankshaft, a drive shaft,
The present invention relates to a torsional damper in which an inertia ring is attached to a plate fixed to a rotating shaft such as a propeller shaft via an elastic body such as rubber, and a viscous fluid is sealed in a gap formed between the three members.

[Conventional technology]

As a conventional torsional damper, as shown in FIG. 3, an inertia ring 4 is attached to a plate 2 fixed to a rotating shaft 1 via rubbers 3, 3 and a gap 10 is provided between the three members.
0 was formed, and the viscous fluid 5 was sealed in the gap 100.
The inertia ring 4 is composed of two divided pieces 4A and 4B. The overlapping portions of the divided pieces 4A and 4B are welded. Alternatively, as shown in FIG. 4, the thin section 4A 'on the side of the divided piece 4A is crimped on the divided piece 4B to be integrated. Thus the gap 100
The torsional damper, in which the viscous fluid 5 is sealed in the gap 100, is lightened for high speed and high output, and the torsional vibration and bending of the crankshaft system of a high-performance engine with a reduced rotation area are used. It is mounted on crankshafts, drive shafts, propeller shafts, etc. to suppress vibration and reduce noise.

[Problem to be solved]

In the conventional torsion damper, the rubber 3 is bonded to the inertia ring 4 and the plate 2 is bonded to the rubber 3 by first vulcanizing and bonding the rubber 3 to the plate 2. Next, the inertia ring 4 is set, and the rubber 3 and the inertia ring 4 are post-adhered mainly by an adhesive. Since the casing for enclosing the viscous fluid 5 is formed by welding or caulking the overlapping portions of the divided pieces 4A and 4B, the adhesive force between the rubber 3 and the inertia ring 4 is weak for performing post-adhesion, During use, the adhesive portion was easily peeled off. The peeling causes foreign matter to infiltrate into the bonding portion, increases the distortion of the rubber 3 and the like, and may significantly shorten the product life.

To resolve such inconveniences,
The one described in the official gazette was developed. This is because the weight (inertial ring) is divided into three parts to make it an assembly type, and rubber is simultaneously vulcanized and bonded to a part of the plate and the weight.
Finally, the remaining weight is welded between the rubber and the pair of vulcanized weights. The weight is composed of a pair of disk-shaped side plate portions and an annular intermediate member fixed between the side plate portions and the outer peripheral portion. The intermediate member has a U-shaped cross section, both side surfaces are in contact with the side plate portion, and both corners of the outer peripheral edge are welded to the side plate portion.

In the torsion damper of the three-part assembly type, the intermediate member inserted between the both side plates that is vulcanized and bonded to the rubber includes:
Since it is impossible to assemble in the form of an annular one, it must be a split type that is cut along the axial direction. For example, two semicircular ones must be used together (substantially Is a 4-split assembly type). Therefore, if two semi-circular shaped parts are combined as an intermediate member, there will be a joint part in the radial direction, and when it is mounted on the crankshaft of a high-speed, high-output, high-performance engine, the circumferential direction The subtle weight balance may be lost, and rotation imbalance may occur. Further, the degree of freedom in weight design is limited by the amount that both side surfaces of the intermediate member overlap the side plate portion, and there is a possibility that the viscous fluid may enter the minute gap in the overlapping portion and the joint portion of the intermediate member. There is also a risk that the relationship between the volume of the storage space and the fluid enclosing amount may change from the initial design value.

Therefore, the present invention improves the reliability of adhesion between the rubber and the inertial ring, makes it easy to design the weight of the inertial ring, does not create an overlapping portion between the members at the gap where the viscous fluid is sealed, and reduces the gap volume and the fluid. It is an object of the present invention to provide a torsional damper in which the relationship with the capacity of the torsion damper does not change.

[Means for solving the problem]

In order to achieve the above object, the present invention divides an inertia ring into an adhesive part including a part to be bonded to rubber and a tip part, and adds a pair of flat ring-shaped adhesive parts by sandwiching rubber on both sides of the plate. Each of the pair of symmetrical left and right annular end parts is made thicker on the outer peripheral edge side than on the inner peripheral edge side, and each outer peripheral edge of the pair of adhesive parts and each inner pair of the tip parts are In addition to welding the peripheral edges, the butt portions formed near the outer peripheral edge of the pair of tip parts and facing each other in the axial direction and buttable are butt welded.

[Action]

Since the bonding between the adhesive part and the rubber constituting the inertial ring is vulcanized bonding, the bonding between the inertial ring and the rubber is highly reliable. Also, by welding the tip parts to the adhesive parts vulcanized to rubber,
A casing with good sealing properties and dimensional accuracy can be obtained. In addition, the tip part is a pair of left and right symmetrical shapes, each of which is integrally annular, and the tip part does not have a seam portion in the radial direction, that is, the seam portion does not exist so as to cross the rotation orbit, and the circumferential direction is The subtle weight balance is not lost.

〔Example〕

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

In FIG. 1, although the rotation shaft 1 is not shown,
A rotating shaft 1 similar to that shown in the figure is present, and a plate 2 is fixed to the rotating shaft 1. The inertia ring 4 attached to the plate 2 via the rubber 3 is formed in a symmetrical shape with the pair of flat ring-shaped bonding parts 4C ₁ and 4D ₁ including a portion to be bonded to the rubber 3 so as to be integrally annular. And a pair of annular tip parts 4C ₂ and 4D _{2 in} which the thickness on the outer peripheral side is larger than the thickness on the inner peripheral side. The bonding parts 4C ₁ and 4D ₁ are vulcanized and bonded to rubber. The rubber 3 and the plate 2 are also vulcanized and bonded. Therefore, the plate 2, rubber 3, and adhesive parts 4C ₁ and 4D ₁ are firmly integrated. Next, adhesive parts 4
Weld the tip parts 4C ₂ and 4D ₂ to C ₁ and 4D ₁ and finally weld the tip parts 4C ₂ and 4D ₂ together, as shown in Fig. 2.
A gap 100 is formed between the three members of the rubber 2, the inertia ring 4, and the same viscous fluid 5 as in the related art is sealed in the gap 100. The tip parts 4C ₂ , 4D ₂ are formed thickest near the outer periphery and thinnest near the inner periphery, and the thickness is determined by the adhesive parts 4C ₁ , 4D ₁
Is formed to have the same thickness as the outer peripheral edge. The inner peripheral edge is welded to the outer peripheral edge of the adhesive parts 4C ₁ , 4D ₁ , and butted portions formed inside each other in the thick portion, that is, opposed to each other in the axial direction near the outer peripheral edge and capable of abutting each other are welded. Laser welding or electron beam welding is preferably used for welding the bonded parts 4C ₁ , 4D ₁ and the tip parts 4C ₂ , 4D ₂ . When laser welding or electron beam welding is performed, the influence of heat is very small, so that the rubber 3 is not adversely affected by heat. In addition, since electron beam welding requires the work atmosphere to be evacuated, there is some difficulty in mass productivity. Laser welding and electron beam welding have a higher energy density than other weldings, and can irradiate a large area with a large amount of energy. Therefore, the temperature rise range is narrow,
Has little effect on rubber, etc.

〔effect〕

As described above, according to the present invention, the inertial ring is divided into an adhesive part including a part to be bonded to rubber and a tip part, and a pair of flat ring-shaped adhesive parts are sandwiched between rubbers on both sides of the plate. A pair of left and right symmetrical shaped annular tip parts are formed to be thicker on the outer peripheral edge side than on the inner peripheral edge side, and each outer peripheral edge of the pair of adhesive parts and each While welding with the inner periphery,
It is formed near the outer peripheral edge of a pair of tip parts, facing each other in the axial direction and buttable butting parts are butt-welded, so that the plate, rubber and adhesive parts are integrated by vulcanization bonding. And the bonding reliability is increased. Since the tip part is welded to the adhesive part and assembled, a casing having good sealing properties and dimensional accuracy can be formed, and a highly reliable torsional damper can be provided. In particular, the pair of tip parts are each integrally annular, and the butting surfaces are oriented in the axial direction and along the circumferential direction, are not divided along the axial direction and are not divided, and Since it is also along the circumferential direction, there is no danger of breaking the delicate weight balance in the circumferential direction and causing rotational imbalance as compared with the one divided along the axial direction.

[Brief description of the drawings]

FIG. 1 is a sectional view of a torsional damper of the present invention before being assembled, FIG. 2 is a sectional view of an assembled state, FIG. 3 is a sectional view showing a conventional example, and FIG. It is a partially expanded sectional view. 1 ...... rotary shaft, 2 ...... plate, 3 ...... rubber, 4 ...... inertia ring, 4C _1, 4D ₁ ...... adhesive part, 4C _2, 4D ₂ ...... drill head, 5 ...... viscous fluid, 100 ... …gap.

Continuing on the front page (72) Koji Shoyama 3-1-1 Hinodai, Hino-shi, Tokyo Hino Automotive Industry Co., Ltd. (72) Inventor Shoji Gomi 150-7 Kashio-cho, Totsuka-ku, Yokohama-shi, Kanagawa-ken (72) Inventor Tomoyuki Kurata 1274-9 Totsuka-cho, Totsuka-ku, Yokohama-shi, Kanagawa-ken Hei 1-145446 (JP, A) Japanese Utility Model Showa 62-112344 (JP, U) Japanese Utility Model Showa 62-185949 (JP, U) Japanese Utility Model Showa 62-27730 (JP, Y2) (58) Field surveyed (Int) .Cl. ⁶ , DB name) F16F 15/16

Claims (1)

(57) [Claims] An inertial ring is attached to a plate fixed to a rotating shaft via rubber, and a viscous fluid is sealed in a gap formed between the three members. Parts are separated into adhesive parts and tip parts, and a pair of flat ring-shaped adhesive parts are vulcanized and bonded with rubber on both sides of the plate, and a pair of symmetrical left and right annular tip parts is the inner circumference The outer peripheral edge is made thicker than the edge, and the outer peripheral edge of the pair of adhesive parts is welded to the inner peripheral edge of the pair of tip parts. A torsional damper formed by butt-butting butted butting portions that are formed facing each other.