JP2013007406A - Torsional vibration shock absorber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem that a recent diesel engine runs at high speed and a cover is often applied over the engine for controlling noises, increasing a temperature around the engine, while a rubber elastic body as an important component of a torsional vibration shock absorber is exposed to high-temperature outside air to accelerate its deterioration.SOLUTION: The torsional vibration shock absorber includes a bottomed cylindrical mounting part inserted at its inner diameter side and fixed into one end of a crank shaft which is rotated while involving torsional vibration, an annular inertia mass body having a width shorter than the width of the mounting part and disposed outside the mounting part, and the cylindrical rubber elastic body thicker than a clearance between the outer diameter of the mounting part and the inner diameter of the inertia mass body, and having a width shorter than the width of the inertia mass body. The rubber elastic body is put into the state of being compressed between the outer peripheral face of the mounting part and the inner peripheral face of the inertia mass body, the mounting part is covered at its outer periphery side with an annular casing part while leaving a slight cavity between the inertia mass body and the outside of the rubber elastic body, and the cavity is filled with viscous liquid.

Description

  The present invention relates to a torsional vibration damper for an internal combustion engine, and more particularly, to a torsional vibration damper excellent in durability in which a rubber elastic body that is a component thereof is not easily deteriorated.

  In the case of an internal combustion engine with a large torsional vibration such as a diesel engine, a torsional vibration damper (torsion damper) is attached to one end of the crankshaft to absorb and absorb the torsional vibration. As shown in FIG. 1, the torsional vibration damper for an internal combustion engine includes a disc-shaped mounting plate 1 fixed to one end of a crankshaft of the internal combustion engine, and an outer diameter of the mounting plate 1, and this mounting plate. An annular rubber elastic body 2 concentrically bonded to both the front and back surfaces of 1 and a metal inertia mass body 3 having a large diameter bonded so as to sandwich the rubber elastic body 2 from both the front and back surfaces, A viscous liquid 5 is enclosed in a gap 4 formed between the mounting plate 1 and the metal inertia mass 3.

  When this is attached to one end of a crankshaft of an internal combustion engine such as a diesel engine, the attachment plate 1 is directly connected to the crankshaft, so that it rotates with rotational vibration, but is attached to the attachment plate 1 via a rubber elastic body 2. Since the connected inertial mass body 3 tries to rotate smoothly due to inertia, the difference in motion between the inertial mass body 3 and the mounting plate 1 is absorbed by the elastic force of the rubber and the shear resistance of the viscous liquid 5 torsional vibration. It is intended to relax.

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In the conventional torsional vibration damper, a part of the rubber elastic body 2 is exposed to the outside and directly touches the outside air. Since the rubber elastic body 2 is made of natural rubber, when it comes into contact with the outside air at a high temperature, the rubber elastic body 2 has a property that the deterioration proceeds and the function is lowered. In particular, the speed of diesel engines in recent years is increasing, and the engine is often covered for noise countermeasures, the temperature around the engine is high, and the rubber elastic body 2 is in an environment where it is more likely to deteriorate. It has been placed.
Furthermore, although the rubber elastic body 2 is bonded to the mounting plate 1 with an adhesive, the adhesive is also likely to deteriorate at high temperatures, and an accident of peeling of the rubber elastic body 2 from the mounting plate 1 due to deterioration of the adhesive occurs. It was easy.

  The present inventor conducted research to solve the above-mentioned problems related to the torsional vibration damper, and as a result, completed a new torsional vibration damper, which is proposed as the present invention.

  It has a bottomed cylindrical shape, a manouting part that is fixed by inserting its inner diameter side into one end of a crankshaft that rotates with torsional vibration, and an annular shape having a lateral width shorter than the lateral width of the mounting part. A cylindrical body having a lateral width that is thicker than the gap between the inertial mass disposed outside the mounting part and the outer diameter of the mounting part and the internal diameter of the inertial mass and shorter than the lateral width of the inertial mass. The rubber elastic body is compressed between the outer peripheral surface of the mounting portion and the inner peripheral surface of the inertia mass body, and a small gap is formed outside the inertia mass body and the rubber elastic body. The above problem was solved by covering the outer peripheral side of the mounting part with an annular casing part and enclosing the viscous liquid in the gap.

  Since the rubber elastic body is completely shielded from the outside air by the casing portion, it is difficult to deteriorate even under high heat. In addition, since the rubber elastic body is connected to the inertia mass body and the mounting part without using an adhesive, there is no risk of a peeling accident due to high temperature deterioration of the adhesive unlike the conventional one, and noise countermeasures are taken. Therefore, the engine is covered and has excellent durability and reliability that can withstand even when exposed to high temperatures.

Sectional drawing of the prior art example of a torsional vibration damper. Sectional drawing of Example 1 of the torsional vibration damper which concerns on this invention. Similarly, the explanatory view showing the manufacturing process. Similarly, the explanatory view showing the manufacturing process. Similarly, the explanatory view showing the manufacturing process.

  The greatest feature lies in that the inertia mass body and the rubber elastic body are completely covered with the casing, the outside air is shut off, and the rubber elastic body is prevented from being deteriorated by heat.

FIG. 2 is a cross-sectional view of a torsional vibration damper according to Embodiment 1 of the present invention, and FIGS.
In the figure, 6 is a mounting portion having a bottomed cylindrical shape, the inner diameter side of which is inserted into one end of a crankshaft of an internal combustion engine such as a diesel engine, and the shaft core x coincides with the crankshaft shaft core. It is a metal member that is fixed by being fixed. Reference numeral 7 denotes an inertia mass body, which is a metal member having a short columnar shape having a width b smaller than the width a of the mounting portion 6 and an inner diameter d larger than the outer diameter c of the mounting portion 6. As shown in the figure, the outer periphery of the mounting portion 6 is positioned so as to cover it. Further, in the gap between the outer peripheral surface of the mounting portion 6 and the inner peripheral surface of the inertia mass body 7, a rubber elastic having a cylindrical shape having a lateral width f slightly smaller than the lateral width b of the inertia mass body 7. The body 8 is fitted in a state compressed in the radial direction.

Further, an annular casing portion 9 is covered on the outer peripheral side of the mounting 6 so as to enclose the inertia mass body 7 and the rubber elastic body 8. It is firmly fixed to the outer peripheral surface by welding.
A slight gap 12 is formed between the inner peripheral surface of the caging portion 9 and the outer peripheral surface of the inertial mass body 7, and the void 12 is filled with a viscous liquid 10 such as silicone oil. In the figure, reference numeral 11 denotes a viscous liquid injection hole formed on the side surface of the casing portion 9, and after the viscous liquid 10 is injected into the gap 12, it is sealed by welding or the like.

  In order to assemble this torsional vibration damper, as shown in FIG. 3, a mounting portion 6, an inertia mass body 7, and a rubber elastic body 8 are prepared, and a rubber elastic body 8 and an inertial mass are provided on the outer periphery of the mounting portion 6. The body 7 is press-fitted simultaneously. Since the thickness of the rubber elastic body 8 is larger than the gap 12, the rubber elastic body 8 is compressed in the radial direction after press-fitting, and the inertia mass body 7 is made of the rubber elastic body 8 as shown in FIG. It is elastically connected to the mounting part 6 via After that, as shown in FIG. 5, a pair of discs 13 and 13 having a width d slightly larger than the total thickness e of the inertia mass body 7 and the rubber elastic body 8 are connected to the front end side and the rear end side of the mounting portion 6. The cylinder 14 is firmly fixed by welding between the upper ends of the discs 13 and 13 to form an annular casing portion 9, and the inertia mass body 7 and rubber elasticity are formed. A void 12 is left around the body 8 to surround it. Then, a viscous liquid 10 such as silicone oil is injected into the gap 12 from the viscous liquid injection hole 11 formed in the disk 13, and after filling the gap 12 with the viscous liquid 10, the viscous liquid injection hole 11 is sealed by welding. Stop and complete this torsional vibration damper.

  In the torsional vibration damper according to this embodiment, since the rubber elastic body 8 is completely cut off from the outside air by the casing portion 9, it is difficult to deteriorate even under high heat. Further, since the rubber elastic body 8 is connected to the inertia mass body 7 and the mounting portion 6 without using an adhesive, there is no possibility of causing a peeling accident due to high-temperature deterioration of the adhesive unlike the conventional one. As a noise countermeasure, the engine is covered and can withstand even when exposed to high temperatures, and has excellent durability and reliability.

  It can be used for an internal combustion engine that rotates with torsional vibration, such as a diesel engine.

1. Mounting plate 2. Rubber elastic body Inertial mass 4. Gaps 5. Viscous liquid Mounting part 7. Inertial mass 8 8. Rubber elastic body Casing part 10. 11. viscous liquid 11. Viscous liquid injection hole Air gap 13. Disc 14. Cylinder

Claims (1)

  It has a bottomed cylindrical shape, a manouting part that is fixed by inserting its inner diameter side into one end of a crankshaft that rotates with torsional vibration, and an annular shape having a lateral width shorter than the lateral width of the mounting part. A cylindrical body having a lateral width that is thicker than the gap between the inertial mass disposed outside the mounting part and the outer diameter of the mounting part and the internal diameter of the inertial mass and shorter than the lateral width of the inertial mass. The rubber elastic body is compressed between the outer peripheral surface of the mounting portion and the inner peripheral surface of the inertia mass body, and a small gap is formed outside the inertia mass body and the rubber elastic body. The torsional vibration damper is characterized in that the outer peripheral side of the mounting part is covered with an annular casing part so that a viscous liquid is enclosed in the gap.

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