JP2600368Y2 - Connection structure between crankshaft and pulley - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connection structure of a crankshaft and a pulley mounted on the crankshaft and driving a fan, a generator and the like via a belt in an automobile engine.

[0002]

2. Description of the Related Art In an engine mounted on an automobile, a torsion or bending force acts on a crankshaft in response to an impact or a change in the rotation speed caused by internal combustion. When the shock cycle in step (1) resonates, a large amplitude torsional vibration is generated. Such torsional vibrations may occur in the normal engine speed range even when a balance weight is attached to the crankshaft, and increase noise, cause crankshaft and other friction and breakage, and reduce thermal efficiency. To prevent this, for example, as disclosed in Japanese Utility Model Application Laid-Open No. 58-33845, a method of attaching a torsional damper to the tip of a crankshaft to prevent torsional vibration is often used.

A pulley (crank pulley) attached to a crankshaft and driving a fan or the like via a belt generates acoustic noise in accordance with the rotation. For example, sound is absorbed inside the pulley. A method of packing materials, a method of insulating sound by covering with a cover, and a method of forming many holes on the side surface of a pulley to suppress noise radiation efficiency have been used.

[0004]

In the above-described method of reducing the radiation noise from the pulley, the noise transmitted from the crankshaft to the pulley is acoustically converted by the pulley, and the noise is radiated. Was not given.

SUMMARY OF THE INVENTION An object of the present invention is to provide a coupling structure between a crankshaft and a pulley that blocks vibration transmitted from the crankshaft to the pulley and reduces noise emitted from the pulley.

[0006]

Means for Solving the Problems The present invention, in the coupling structure between the crankshaft and the pulley fitted with a damper and a pulley to the crankshaft, fitted with the damper through a mounting bolt to the crank shaft, the dan
Between the damper and the pulley.
And a spacer between both spacers
And attach the adapter to connect the
The cylindrical space that houses the head of the mounting bolt.
The pulley-side spacer has a disk shape
The pulley has a substantially cylindrical shape, and the pulley has a cylindrical space.
It is characterized by housing the spacer on the rear side .

[0007]

The vibration between the crankshaft and the pulley is cut off by the vibration isolating rubber connected between the crankshaft to which the damper is attached and the pulley.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows an embodiment of the present invention.

[0009] In Figure, the damper 12 to one end of the crank shaft 11 is connected by a mounting bolt 20, and its damper 12 is connected by spacer 13 ₁ screwed to extend the axis of rotation of the crankshaft 11. Such spacers 13 _1, and anti-vibration rubber 14 obtained by molding a material enriched in the nitrile rubber or other vibration damping characteristics in a ring shape, the rotation shaft and the spacer 13 ₂ forming a disc shape described above Are further superposed in the direction of further extension.
The spacer 13 ₂ is connected by a pulley 15 is screwed together around the rotation axis mentioned above. Where Dan
Spacers 13 ₁ Pa side, the head of the mounting bolt 20 yield
It has a cylindrical space 23 to accommodate. The pulley 15 is substantially
It has a cylindrical shape, and a pulley-side spacer is provided in the cylindrical space 25.
Housing the 13 _2.

[0010] Note that the method of integration of the spacer 13 _1, 13 ₂ and anti-vibration rubber 14 disposed pinched between these spacers, for example, spacers _131-134
2 and an anti-vibration rubber 14 using an adhesive, assembling by applying a fitting structure or a screwing structure between them, or mechanically transmitted between the crankshaft 11 and the pulley 15. If sufficient vibration isolation can be ensured, a method in which the tip of the crankshaft 11 is extended in a predetermined shape and assembled by screwing or screwing can be used. Hereinafter, the operation of the present embodiment will be described.

The damper 12 absorbs torsional vibration and bending vibration transmitted mechanically from the crankshaft 11 by the internal friction of the material. However, the frequency components of the audio frequency band such vibration is not sufficiently attenuated by only the action of absorption of da damper 12 described above, mechanically spacer 1
3 ₁ through is transmitted to rubber cushion 14.

[0012] anti-vibration rubber 14, because it is formed by the rich material anti-vibration characteristics, such as nitrile rubber, the vibrations transmitted from the spacer 13 ₁ side as described above to vibration energy by internal friction of the material Convert and absorb.

Therefore, the spacer 1 is separated from the vibration isolating rubber 14.
Vibrations transmitted to the pulley 15 via a 3 ₂ decreases considerably as compared with the conventional example, the level of noise is acoustically radiated from the pulley 15 is reduced in accordance with the vibration.

[0014]

As described above, according to the present invention, the vibration transmitted to the pulley from the crankshaft is absorbed by providing the pulley by extending the rotation axis of the crankshaft via the vibration isolating rubber. , The level of noise acoustically emitted from the pulley is reduced.

Therefore, in a vehicle equipped with an engine to which the present invention is applied, the engine noise level is reduced, the driving environment becomes comfortable, and the performance is enhanced.

[Brief description of the drawings]

FIG. 1 is a diagram showing an embodiment of the present invention.

[Explanation of symbols]

 11 Crankshaft 12 Damper 13 Spacer 14 Anti-vibration rubber 15 Pulley

──────────────────────────────────────────────────続 き Continuation of the front page (56) References Japanese Utility Model Hei 1-166855 (JP, U) Japanese Utility Model Hei 4-105237 (JP, U) Japanese Utility Model Sho 62-77348 (JP, U) Japanese Utility Model Sho 63- 23644 (JP, Y1) (58) Fields investigated (Int. Cl. ⁶ , DB name) F16F 15/136 F02B 77/00 F16F 15/126 F16H 55/36

Claims (1)

(57) [Scope of request for utility model registration] 1. A connecting structure of a crankshaft and a pulley, wherein a damper and a pulley are mounted on a crankshaft, wherein the damper is mounted on the crankshaft via a mounting bolt , and the damper and the pulley are mounted. Between, damper
Side and pulley side spacers.
An adapter that connects between the sensors via rubber is attached.
Only, of the damper-side spacer, the head of the mounting bolt
It has a cylindrical space for storage, and the spacer on the pulley side is
It has a disk shape, and the pulley has a substantially cylindrical shape.
A connection structure between a crankshaft and a pulley, wherein the pulley-side spacer is housed in a cylindrical space .