JPS6038578B2 - wet damper - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wet damper installed between the crankshaft of an engine and the input shaft of a gear housing. There is.

Conventionally, a coupling flange was fixed to the end of the crankshaft,
A damper in the form of a clutch disc is installed between the coupling flange and the end of the input shaft. However, the friction washers of conventional swing dampers are dry type (organic facing, etc.), and the friction coefficient is generally 0.
3 to 0.4, and the relationship between switching angle and torque is shown in Figure 1A.
As a result, the hysteresis torque (vertical width in FIG. 1A) is significantly reduced, and the damper effect is reduced. In order to increase the vibration damping ability by changing the hysteresis characteristics as shown in Figure 1B, it is necessary to increase heat resistance and wear resistance.
Not only is it expensive, but the dry method is also impractical. When a wet type friction material is used for generating hysteresis, droplet lubrication alone is not sufficient to lubricate the friction material portion (due to centrifugal force, it does not enter the inside). If the damper is used with the entire damper submerged in oil, engine rotational resistance increases and mechanical loss increases. There is no viscous damper effect when using a wet type. The present invention adopts a wet friction washer instead of a dry friction washer of the damper,
Characteristic B in Figure 1 was made possible by improving the friction washer so that it is constantly immersed in oil during operation.
FIG. 2 shows one embodiment.

1 in Fig. 2 is the engine crankshaft, to the end of which a cylindrical boss portion 5 of a coupling flange 4 is fixed via a key 2 and a retaining pin 3, and an oil hole 6 provided in the center. An orifice 7 is attached to the tip, and the other end of the oil hole 6 is connected to a discharge port of an oil pump (not shown). A controlled amount of oil therefore flows out of the orifice 7 during engine operation. A plurality of bolts 8 are attached to the outer periphery of the coupling flange 4 to connect the outer periphery of the damper plate lo of the damper sopar 9 and the annular oil reservoir 1.
The outer periphery of 1 (shroud) is covered with cotton to keep it liquid-tight.

The structure of the main body of the swing damper 9 is similar to that of a single-plate clutch disc used in automobiles, etc. In addition to the damper plate 10, a damper plate 10' is fixed with a plurality of stop pins 12, or a retaining plate is used. 1
3. A disc spring 14 in contact with the inner surface of the retaining plate 13, a friction plate 15 in contact with the inner surface of the disc spring 14, a splice hub 16, and a spline hub 16.
wet friction washers 18 and 19 in contact with both sides of the outward flange portion 17, and a plurality of false coil springs 2.
Equipped with 0 etc. Each stop pin 12 has a flange portion 1
It is located in the center of a notch 22 provided on the outer peripheral edge of the plate 7 with a gap in the circumferential direction, and regulates the rotation angle of the flange portion 17 with respect to both plates 10 and 13. The plurality of bent pieces 23 provided on the inner circumferential edge of the friction plate 15 fit into the corresponding portions 24 of the retaining plate 13, so that the plate 15 is fixed to the retaining plate 13.
rotates with. Stud pin 21 is attached to plate 10,1
3, 15, disc spring 14, friction washer 18, 1
9 and the elongated hole 25 extending in the circumferential direction provided in the flange portion 17, whereby both plates 10, 1
When the flange portion 17 is rolled relative to the flange portion 3, friction is generated between both surfaces of the flange portion 17 and the friction washers 18 and 19 in contact therewith. Each slope coil spring 2
0 is a rectangular window hole 26 provided in the flange portion 17 and a window hole 27 provided in the plates 10 and 13 in a posture extending in the circumferential direction.
28, and both end surfaces contact the green 29 of the window hole 26, and also face or contact the greens 30, 31 of the window holes 27, 28.

The oil reservoir 11 is generally a dish-shaped annular body, and the inner circumferential green is close to the outer circumferential surface of the end of the spline hub 16, and the inner flange D is closer to the inner diameter of the friction washers 18 and 19>4
・Sashi. 32 is a narrow annular drain hole formed between the oil reservoir 11 and the spline hub 16.

Input ball 3 where spline hub 16 is spline-coupled
3 is concentric with the crankshaft 1 and is a marine gear housing 34.
It protrudes toward the crankshaft 1 from.

The housing 34 is a member that is fastened to the crankcase of the engine. The rotational force of the engine during operation is crankshaft 1
The force is transmitted to the damper plate 10 of the damper 9 through the spring flange 4, and the damper plate 10 drives the flange portion 17 together with the retaining plate 13 via the gripping coil spring 20, and is transmitted to the flange portion 17. The rotational force is transmitted to the input shaft 33 from the splice half 16. When the plates 10, 13 and the spline hub flange 17 rub against each other, the hysteresis characteristic shown in FIG. occurs, and torque fluctuations are absorbed. During operation, the oil flowing out from the orifice 7 into the oil reservoir 11 fills the oil reservoir 11 due to centrifugal force to form a cavity with an inner diameter of ○, and only the amount corresponding to the amount flowing from the orifice 7 flows into the drain hole. It flows out from 32. For this reason, the friction washer 18 made of wet friction material,
19 is completely immersed in the oil and performs frictional movement with the flange portion 17 while being sufficiently lubricated by the oil.
The friction material of the friction washers 18 and 19 is cork, cortex rubber, asbestos vapor, etc., and the dynamic friction coefficient when wet is, for example, 0.12 to 0.2.
It is. As explained above, according to the present invention, the friction washers 18 and 19 made of a wet type friction material are employed in the friction damper 9, and the friction washers 18 and 19 are immersed in oil during normal operation by the oil reservoir 11. As a result, a green type damper is formed and the first
As shown in Figure B, characteristics with large hysteresis torque are obtained,
Vibration damping capacity can be significantly increased.

Moreover, it can be implemented by only making slight improvements to the damper instead of the slave, and there is little risk of cost increase. There is no need to pay special attention to the heat resistance and wear resistance of the friction washer, which increases the durability of the device and reduces maintenance costs.Furthermore, according to the present invention, there is less power loss during rotation. The friction material is completely lubricated, resulting in an oil cooling effect and
Vibration absorption effect and long life can be achieved. Since the oil in the oil chamber 35 has a viscous damping force, the damper effect is increased.

[Brief explanation of drawings]

FIG. 1 is a graph showing the torque characteristics with respect to the deflection angle, and FIG. 2 is a longitudinal sectional view of the wet damper according to the present invention. 1...Crankshaft, 4...Coupling flange, 7...
... Orifice, 9 ... Replacement damper, 10 ... Damper plate, 11 ... Oil reservoir (shroud),
13...Retaining plate, 16...Subline hub, 17...Outward flange portion, 18, 19...
・Friction washer for warm type, 20... Swing coil pan, 26... Window hole, 33... Input ball,
34...Gya housing, 35...Oil chamber. Traditional figure 1 fin 2 figure

Claims (1)

[Claims] 1. Fix the cylindrical boss part of the coupling flange to the end of the engine crankshaft, fasten the outer periphery of the annular oil reservoir to the outer periphery of the coupling flange via the outer periphery of the damper plate of the torsional damper, and The spline hub of the damper is spline-fitted to the input shaft of the gear housing, and the damper plate and retaining plate are pressed together on both sides of the outward flange of the spline hub via wet friction washers, and the outer periphery of both plates is pressed. is fixed with a stop pin, and both ends of the torsion coil spring extending in the circumferential direction fitted into the window hole in the flange part are opposed to the edges of the window holes in both plates, and the engine oil outlet at the end of the crankshaft is opened toward the inside of the oil reservoir. A wet damper characterized in that the inner diameter of the oil reservoir is equal to or smaller than the inner diameter of the friction washer.