JPH06159444A - Viscous damper - Google Patents

Abstract

PURPOSE:To improve the durability and the ability to suppress vibration, and reduce the weight by forming a damper plate and a casing body of a high- strength Al alloy having high tensile strength, and forming the covering member of the casing body by an Al alloy having lower tensile strength and good weldability. CONSTITUTION:With regard to a viscous damper 10, when a torsional motion occurs in a rotary shaft having a center-line O-O, a relative rotational displacement is produced between a hollow, ring-like casing 14 arranged and installed concentrically with the rotary shaft on the outer peripheral part of a damper plate 12 rotating integrally with the rotary shaft, and an inertial body 24 housed in the casing through a micro-clearance. The vibration suppressing effect is produced due to the viscous resistance of a viscous liquid 26 charged in the micro-clearance. In this constitution, the damper plate 12 and the casing body 16 are formed of a high-strength aluminum alloy having high tensile strength. On the other hand, a covering member 18 for closing the viscous liquid charging opening of the casing body 16 is formed by an aluminum alloy having lower tensile strength and good weldability.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a viscous damper mounted on a rotary shaft such as a crankshaft of a vehicle diesel engine to reduce torsional vibration of the rotary shaft.

[0002]

2. Description of the Related Art A plate-shaped damper plate fixed to a rotating shaft of a vehicle diesel engine such as a crank shaft where torsional vibration is generated and rotating integrally with the rotating shaft, and the rotating shaft on the outer peripheral portion of the damper plate. A hollow annular casing concentrically arranged with respect to the casing, an annular inertial body accommodated in the casing with an appropriate small gap between the casing and the inner wall surface, and the casing inner wall surface and the inertial body. A viscous damper having a viscous liquid such as silicone oil filled in the gap between the two is well known in the art.

In the conventional viscous damper, since the damper plate, the annular casing, and the inertial body are all made of an iron-based material such as steel or cast iron, the weight is essentially large, and particularly the crankshaft of a vehicle engine. In the case of the viscous damper mounted on the vehicle, it is required to reduce the weight.

On the other hand, regarding the damping effect of the viscous damper,
It is advantageous that the weight of the inertial body is large within a design allowable range, but it is advantageous that the annular casing and the damper plate are lightweight within a range allowable for strength. Therefore, in order to reduce the weight of the viscous damper,
It is desirable that the annular casing and the damper plate are made of aluminum alloy.

The annular casing is generally a casing body having a U-shaped cross-section with an annular opening for inserting the inertial body on one side surface in the axial direction of the damper,
The cover member is configured to close the opening after insertion of the inertial body, and the cover member has a small-diameter hole for filling a viscous liquid such as silicone oil inside the casing. Is closed by the plug member after the injection of the viscous liquid. Further, the plug member is usually welded to the cover member after being attached to the cover member in order to reliably prevent leakage of the viscous liquid filled in the casing.

When an annular casing having the above structure is manufactured from an aluminum alloy to reduce the weight and at the same time to improve the vibration damping function, the same aluminum alloy is usually used for both the casing body and the cover member. used. However, in order to secure the necessary strength for the annular casing and the damper plate, when a high-strength aluminum alloy is used, the weldability of the plug member mounted in the small diameter hole of the cover member after filling the viscous liquid inside the casing is improved. Poorly, welding defects are likely to occur, and there is a disadvantage that durability and reliability are lacking. Therefore, if an aluminum alloy material having good weldability is used to prevent the occurrence of the above-mentioned welding defects, the strength of the annular casing and the damper plate will be insufficient, and it is possible to ensure sufficient durability and reliability. There is a problem that disappears.

[0007]

SUMMARY OF THE INVENTION The present invention has been devised in view of the above circumstances, and an object thereof is to provide a viscous damper having excellent durability and reliability, lightweight and excellent vibration damping performance. Is.

[0008]

In order to solve the above-mentioned problems, the present invention provides a plate-shaped damper plate fixed to a rotary shaft and rotating integrally with the rotary shaft, and the above-mentioned rotation on the outer peripheral portion of the damper plate. A hollow annular casing concentrically arranged with respect to the shaft, an annular inertial body accommodated in the casing with an appropriate small gap between the casing and the inner wall surface, and the casing inner wall surface and the above A viscous liquid such as silicon oil filled in a gap between the inertial body and the annular casing, the casing body having an opening for inserting the inertial body, and the opening closed after the inertial body is inserted. The damper plate and the casing body are made of a high-strength aluminum alloy having high tensile strength, and the cover member is made of a high-strength alloy. It proposes a viscous damper, characterized in that tension from Miniumu alloy strength is made by small weldability good aluminum alloy.

[0009]

Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. In the figure, reference numeral 10 generally indicates a viscous damper, which is fixed to a rotary shaft such as a crankshaft of a diesel engine (only the center line O-O is shown) and is integrated with the rotary shaft. A rotating plate-shaped damper plate 12 and a hollow annular casing 14 concentrically arranged with respect to the rotating shaft are provided on the outer peripheral portion of the damper plate.

The annular casing 14 is formed integrally with the damper plate 12, and is attached to the opening end of the annular casing body 16 having a U-shaped cross section whose one side in the axial direction is open. After that, the outer peripheral edge and the inner peripheral edge are caulked and fixed, and the cover member 18 is made of an annular plate material.

The casing body 16 and the damper plate 12 are formed of an aluminum alloy for wrought material having a large tensile strength and a large elongation, for example, JIS A6061 or an aluminum alloy plate having a tensile strength and an elongation equivalent thereto. After forging and shaping, after quenching treatment, 100 ℃ ～ 2
Tempered at a suitable temperature of 00 ° C. for a suitable time (T
₆ ) Manufactured by performing necessary machining on the forged blank.

On the other hand, the cover member 18 is an aluminum alloy for wrought material having relatively low tensile strength but excellent weldability, for example, JIS A5454 or an aluminum alloy having tensile strength and weldability equivalent thereto. It is manufactured by punching or cutting a plate into an annular shape. The cover member 18
One or more, usually at least two small-diameter holes 20 are bored in this. A screw is engraved in each of the small-diameter holes 20, and as described later, for example, a plug member 22 made of JISA 5454 or an aluminum alloy for wrought material having excellent weldability corresponding thereto is screwed. Is blocked by.

Inside the annular casing 14, an appropriate small gap, for example, 0.3 to 0.5 m, is formed between the annular casing 14 and the inner wall surface thereof.
Inertial body 2 having a substantially rectangular cross-section with a gap of m
4 are accommodated. The inertial body 24 is the viscous damper 10
From the viewpoints of vibration damping function and strength, it is usually made of an iron-based material, for example, ductile cast iron or steel, and subjected to necessary machining. The inertial body 24 and the annular casing 14
Between the inner wall surface and the inner wall surface of the
Silicon oil 2 of 0,000 to 300,000 CSt (at 25 ° C)
6 is filled.

A plurality of ring bearings 28 made of Teflon resin are respectively arranged on the two side surfaces of the inertial body 24 at right angles to the axis line at appropriate intervals in the circumferential direction. An annular bearing 30 made of Teflon resin is also provided on the inner peripheral surface of the annular body 24. Further, the damper plate 12 is provided with a plurality of bolt holes 34 for fixing the damper plate to the rotating shaft at equal intervals in the circumferential direction.

In manufacturing the above-mentioned viscous damper 10,
The inertial body 24 and the bearing 2 are provided inside the annular casing 14.
After inserting 8 and 30, the annular cover member 18 is mounted in the opening of the casing body 16, and the thin edges 36 and 38 of the opening edge of the casing body 16 are provided with an appropriate sealing material not shown. The cover member 18 is fixed by swaging.

Next, after a viscous liquid such as silicon oil is injected and filled into the inside of the annular casing 14 from the small diameter hole 20 formed in the cover member 18, the plug member 22 is screwed into the small diameter hole 20. . Further, the annular casing 14
The viscous liquid filled inside expands and contracts due to temperature change, so that the plug member 22 and the small diameter hole 2 are
The plug member 22 has its outer peripheral surface welded to the cover member 18 in order to prevent the viscous liquid from leaking to the outside through the 0 screw groove or the outside air to leak into the annular casing. .

In the viscous damper 10, when torsional vibration occurs in a rotary shaft such as a crankshaft of an engine, relative rotational displacement occurs between the inner wall surface of the annular casing 14 and the outer peripheral surface of the inertial body 24, and silicon oil is used. A shearing resistance is generated based on the viscosity of the isoviscous liquid to exert a vibration damping effect. . At this time, the damper plate 12, the annular casing 14, and the cover member 1 which are fixed to the rotary shaft such as the crank shaft.
8 is made of an aluminum alloy in place of the conventional iron-based material to reduce the weight and reduce the mass of the rotating shaft system, thereby improving the vibration damping function of the viscous damper 10.

During operation of the viscous damper 10, not only a large radial force due to centrifugal force acts on the annular casing 14 and the damper plate 12, but especially when the rotating shaft is a crankshaft of an engine or the like. When bending vibration occurs in the shaft, the viscous damper 10 causes a displacement in which the viscous damper 10 reciprocates back and forth in the direction of the crank axis, and a large bending force acts on the damper plate 12 and the joint portion between the damper plate 12 and the annular casing 14. . Against these large acting forces, the casing body 16 of the annular casing 14 and the damper plate 12 are set in accordance with JIS as described above.
Sufficient strength can be secured by hot forging and forming a high-strength aluminum alloy sheet material such as A6061 and performing an annealing treatment. Further, since the high-strength aluminum alloy has excellent elongation, when the thin edges 36 and 38 on the inner and outer circumferences of the cover member 18 are crimped, the soundness of the crimped portion can be secured.

Next, since the cover member 18 for closing the opening of the annular casing 14 is made of an aluminum alloy plate material such as JIS A5454 which has relatively low tensile strength but excellent weldability, the above-mentioned plug is used. Member 22
After welding, when welding the outer peripheral surface, sound welding can be easily performed without causing welding defects. As a result, the durability and reliability of the viscous damper 10 as a whole can be secured.

[0020]

As described above, the viscous damper according to the present invention includes a plate-shaped damper plate fixed to the rotating shaft and rotating integrally with the rotating shaft, and the rotating shaft on the outer peripheral portion of the damper plate. A hollow annular casing concentrically arranged with respect to the casing, an annular inertial body accommodated in the casing with an appropriate small gap between the casing and the inner wall surface, the casing inner wall surface and the inertia With a viscous liquid such as silicone oil filled in the gap between the body and the annular casing,
A casing body having an opening for inserting the inertial body and a cover for closing the opening after the insertion of the inertial body, wherein the damper plate and the casing body have a high tensile strength. Made of a strong aluminum alloy, and the cover member is
A viscous damper that is characterized by being made of an aluminum alloy having a lower tensile strength and better weldability than the above high-strength aluminum alloy, is lightweight, has an excellent vibration damping function, and has excellent durability and reliability. There are advantages.

[Brief description of drawings]

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

FIG. 2 is a partial front view seen from the direction of arrow II in FIG.

[Explanation of symbols]

 10 Viscous Damper 12 Damper Plate 14 Annular Casing 18 Cover Member 24 Inertial Body 26 Viscous Liquid

Claims (1)

[Claims] 1. A plate-shaped damper plate fixed to a rotary shaft and rotating integrally with the rotary shaft, and a hollow annular casing concentrically arranged with respect to the rotary shaft on an outer peripheral portion of the damper plate. , An annular inertial body accommodated in the casing with an appropriate small gap between the casing and the inner wall surface, and silicone oil filled in the gap between the casing inner wall surface and the inertial body. A damper plate, wherein the annular casing comprises a casing body having an opening for inserting the inertial body, and a cover for closing the opening after inserting the inertial body. And the casing body is made of a high-strength aluminum alloy having a high tensile strength, and the cover member has a lower tensile strength and a better weldability than the high-strength aluminum alloy. A viscous damper characterized by being made of a minium alloy.