KR20170065230A

KR20170065230A - Temperature Response type Torsional Damper and Crankshaft thereby

Info

Publication number: KR20170065230A
Application number: KR1020150171414A
Authority: KR
Inventors: 손상철
Original assignee: 현대자동차주식회사
Priority date: 2015-12-03
Filing date: 2015-12-03
Publication date: 2017-06-13
Also published as: KR101755912B1

Abstract

The inventive local damper 1 is provided with the inertial ring 30 in the inner chamber 13 of the enclosed housing filled with 80% of the volume of the oil 80, (90-1, 90-2) in which expansion occurs for axial movement of the engine (80) when the crankshaft (100) is applied to the crankshaft The bearing clearances La and Lb are changed by the expansion of the temperature responsive members 90-1 and 90-2 under the high speed / high load condition, so that the damping performance can be optimized to the same as the low middle / low load, By adjusting the temperature of silicone oil to low middle / low load conditions by avoiding the rated point RPM, it is possible to lower the local vibration by the reduction of the silicon temperature and reduce the cost of using low viscosity oil.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a temperature sensitive type torsional damper and a crankshaft,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to a torque damper, and more particularly, to a temperature sensitive type torque damper that exhibits optimized damping performance under various operating conditions of an engine and a crankshaft using the same.

In general, a state damper is composed of a case and a cover that function as a housing, an inertia ring that acts as a medium to convert vibration energy to thermal energy, and a bearing that maintains a smooth relative motion between the case and the inertial mass. The risk of fatigue breakage is eliminated by preventing the torsional displacement applied to the crankshaft from being increased due to the combustion pressure generated in the explosion of each cylinder.

The viscous damper of the local damper is a method of applying silicone oil filled to about 80% so that the inner space of the housing made up of the case and the cover has an empty volume, and the silicone oil absorbs heat energy and diverges to the outside. In particular, the viscous damper has an advantage that the heat radiation area can be easily expanded to prevent deterioration of the silicone oil due to the increase of the outer diameter / width of the housing, and the heat transfer amount of the silicone oil can be easily increased by applying the cooling fin.

Therefore, the viscous damper is applied to the crankshaft of a commercial engine which requires a damping performance which is excellent in engine characteristics, because the viscosity of the silicone oil is easily maintained at a viscosity having a friction force with a high kinetic energy absorption.

Japanese Patent Laid-Open No. 2009-156331 (July 16, 2009)

However, the viscous damper is designed to meet the maximum combustion pressure of the engine, which is the maximum temperature of the silicone oil, and the revolutions per minute (RPM) near the rated point of the engine. There is a limit to the difficulty.

For example, the actual vehicle running in the field is operated largely under the conditions of the maximum combustion pressure and the rated load, rather than at the midpoint / low load conditions, so that the viscus damper operates without matching performance optimization conditions. As a result, the operation of the viscus damper, (torsional vibration) is increased, leading to unwanted noise and vibration.

In view of the above, the present invention compensates for the viscosity by controlling the sliding portion of the sliding portion at high speed and high load at which the silicone oil viscosity is adjusted to the low / middle / low load of the engine, thereby improving the performance in the main operation region, The durability of the condition is ensured. In particular, by adjusting the temperature of the silicone oil to the low middle / low load conditions by avoiding the maximum combustion pressure and the rated point RPM of the engine, it is possible to lower the localized vibration by the reduction of the silicon temperature, The present invention provides a temperature sensitive type torque damper and a crankshaft using the same.

In order to accomplish the above object, the temperature sensitive type state-of-the-art damper of the present invention is provided with an inertia ring in an inner chamber of an enclosed housing filled with oil at an 80% volume, A temperature responsive member for axially moving the inertial ring so as to reinforce frictional force of the inertial ring and generating axial movement of the inertial ring by expansion due to the deterioration temperature of the oil; Is included.

In a preferred embodiment, the expansion is caused by wax melting at the deterioration temperature of the oil, the deterioration temperature of the oil is 80 ° C, and the wax is applied to a thermostat.

In a preferred embodiment, the temperature-sensitive member is composed of a plurality of temperature-sensitive members arranged to be symmetrical with respect to the center of the inertia ring. The inertia ring is formed with a plurality of oil chambers filled with the oil, and each of the oil chambers receives the temperature sensitive member. The oil chambers are respectively formed on both sides of the inertia ring, or a plurality of the oil chambers are formed in the circumferential direction of the inertia ring, so that the temperature sensitive member is accommodated.

In a preferred embodiment, the inertia ring is arranged with a plurality of thrust bearings in the axial direction, and the temperature sensitive member is positioned between the thrust bearings.

According to a preferred embodiment, the housing is constituted by a case and a cover, the inertia ring and the cover form a bearing gap of the cover side, the inertia ring and the case form a bearing gap of the case side, And the bearing gap between the case and the inertia ring are changed by the axial movement of the inertia ring. A shaft hole is drilled at the center of the case and the cover.

In order to achieve the above object, the crankshaft of the present invention includes a case and a cover which are coupled to each other to form an inner chamber filled with oil at an 80% volume, A thrust bearing which is provided on both left and right sides of the inertia ring to form a bearing gap, and a thrust bearing which is provided in the inertia ring and which moves the inertia ring in the axial direction when the oil is deteriorated, A state damper composed of a temperature sensitive member; And a crank nose which is inserted into the case and the shaft hole drilled in the cover and is bolted together.

The local damper of the present invention compensates for the decrease in silicon viscosity due to the engine operating conditions so that the damping performance can be matched according to the change of the silicon temperature, thereby securing the durability in the maximum load operating range of the engine, Optimization improves noise / vibration.

Further, the local damper of the present invention hardly changes the structure of the damper by compensating the low viscosity of the silicone oil deteriorated due to the rise in the damper inner / outer temperature by the adjustment of the clearance between the bearing gap and the sliding portion.

Further, in the case of the conventional damper of the present invention, the structure including the solid wax in which the volume of the bearing gap or the sliding portion is controlled by the temperature change in the damper is adopted, or the temperature sensitive thermostat is used, The desired performance is exhibited even at a low viscosity of the silicone oil deteriorated by the silicone oil.

In addition, since the temperature of the silicone oil of the present invention is adjusted to the low-middle-speed / low-load conditions, the damper outer diameter / width for increasing the heat dissipation area can be reduced to realize weight reduction. Particularly, It is possible to reduce the cost by using low viscosity oil instead of increasing high viscosity silicone oil.

Also, since the crushshaft of the present invention is a viscous damper in which the damping performance is optimized in a temperature responsive manner, the safety is greatly improved from the risk of fatigue failure even under the torsion condition of a commercial engine.

2 is a partial sectional view of a temperature sensitive type local damper according to the present invention. FIG. 3 is a sectional view of a temperature sensitive type local damper according to the present invention. 4 is a configuration diagram of a crankshaft to which a temperature sensitive type of local damper according to the present invention is applied, and FIG. 5 is a view showing an example of the operation of the temperature sensitive local damper applied to the crankshaft according to the present invention. TV (Torsional Vibration) is an example.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, which illustrate exemplary embodiments of the present invention. The present invention is not limited to these embodiments.

Fig. 1 shows a configuration of a temperature sensitive type local damper 10 according to the present invention.

Components of the local damper 1 include a housing 10 and a cover 20, an inertia ring 30, an inner bearing 50, thrust bearings 70-1, 70-2, 3 and 70-4, and temperature sensitive members 90-1 and 90-2.

Specifically, the case 10 has a cylindrical shape in which the shaft direct flange 11 is concentrically formed, and the inertial ring 30, the inner bearing 50, and the thrust bearing (not shown) 70-1, 70-2, and the inner chamber 13 in which the volume of about 80% is filled with the oil is formed in a state in which the temperature sensitive members 90-1, 90-2 are accommodated. The cover 20 is made of a disc. The case 10 and the cover 20 are each formed with a plurality of holes spaced apart from each other so that the case coupling hole 11a and the cover coupling hole 20a are circular and circular shaft holes 11b and 21b are drilled . The shaft holes (11b, 21b) are connected to a rotary shaft for reducing the torsional load by damping. The case 10 and the cover 20 are fixed by welding.

Specifically, the inertia ring 30 is an inertia ring having an inner / outer diameter / width. In order to reduce the torsional displacement, which is a function of the local damper, the inertial ring 30 is integrally formed with the case 10 and the cover 20, And acts as a medium for converting the vibration energy into thermal energy. The inertia ring 30 has a bearing groove 31 formed on one side and forms an oil chamber 32 on the opposite side of the bearing groove 31. The bearing groove 31 is generally shown But is also formed in the same plane as the surface on which the oil chamber 32 is formed. In particular, the material of the inertia ring 30 may be cast iron or copper.

More specifically, the inner bearing 50 secures a clearance between the case 10 and the inertial ring 30 and smoothes the relative movement of the inertial ring 30 to the case 10 and the cover 20, . The inner bearing 50 is positioned between the inertial ring 30 and the shaft direct flange 11 by being engaged with the outer diameter of the shaft direct flange 11 of the case 10.

More specifically, the thrust bearing 70-1, 70-2, 70-3, and 70-4 is coupled to the bearing groove 31 of the inertia ring 30 so that the inertia ring 30 and the cover 20 So that relative movement of the inertia ring 30 relative to the case 10 is smoothly maintained. Further, the shape of the thrust bearing (70-1, 70-2, 70-3, and 70-4) may be various shapes such as an "L" shape or a discrete shape in which the circumferential direction and the thrust direction are simultaneously in contact have. In particular, the thrust bearings 70-1, 70-2, 70-3, and 70-4 are not shown but are equally coupled to the bearing grooves provided on the side where the oil chamber 32 is formed.

More specifically, the temperature sensitive members 90-1 and 90-2 are coupled to the oil chamber 32 of the inertial ring 30 and positioned between the inertial ring 30 and the case 10, And adjusts the bearing oil gap according to the temperature change of the oil filled in the inner chamber (13).

The layout of the local damper 1 is as follows.

Specifically, the bearing groove 31 is divided into first and second bearing grooves formed in an upper 180-degree interval from the center of the circle of the inertia ring 30 and third and fourth bearings formed in a lower 180-degree interval, The oil chamber 32 is divided into a first oil chamber formed between the first and second bearing grooves and a second oil chamber formed between the third and fourth bearing grooves. The thrust bearings 70-1, 70-2, 70-3, and 70-4 are respectively coupled to the first, second, third, and fourth bearing grooves, and the temperature sensitive member 90 -1, 90-2), respectively.

Specifically, the thrust bearings 70-1, 70-2, 70-3, and 70-4 include four first, second, third, and fourth thrust bearings 70-1, The first and second thrust bearings 70-1 and 70-2 are coupled to the first and second bearing grooves of the bearing groove 31, The bearings 70-3 and 70-4 are coupled to the third and fourth bearing grooves of the bearing groove 31, respectively. Therefore, the first and second thrust bearings 70-1 and 70-2 are divided into upper thrust bearings, and the third and fourth thrust bearings 70-3 and 70-4 are connected to the lower thrust bearing . In addition, the first thrust bearing 70-1, the second thrust bearing 70-2, the third thrust bearing 70-3, and the fourth thrust bearing 70-4 may be coupled to each other The first thrust bearing 70-1 and the third thrust bearing 70-3 and the second thrust bearing 70-2 and the fourth thrust bearing 70-2 are spaced from each other by 90 degrees, The striking bearings 70-4 form a 90 degree gap with respect to each other.

More specifically, the temperature sensitive members 90-1 and 90-2 are constituted by two first and second temperature sensitive members 90-1 and 90-2, and the first temperature sensitive member 90-1, Is coupled to the first oil chamber of the oil chamber 32 and the second temperature sensitive member 90-2 is coupled to the second oil chamber of the oil chamber 32. [ Therefore, the first temperature sensitive member 90-1 is divided into the upper temperature sensitive member, and the second temperature sensitive member 90-2 is divided into the lower temperature sensitive member. Particularly, the temperature sensitive members 90-1 and 90-2 are composed of four in total, and two or more temperature sensitive members 90-1 and 90-2 may be arranged on both sides of the inertia ring 30, or a plurality of the temperature sensitive members 90-1 and 90-2 may be arranged in the circumferential direction of the inertial ring 30. And the arrangement structure or the total quantity may be changed to be optimized according to the engine performance.

On the other hand, FIG. 2 shows an example of temperature sensitive members 90-1 and 90-2 applied to a viscous damper type local damper 1 of a commercial engine.

The oil 80 is injected into the inner chamber 13 of the case 10 and the cover 20 so that the heat energy generated by the relative movement of the inertia ring 30 to the case 10 and the cover 20 And the absorbed heat energy is discharged to the case 10 and the cover 20. [ One of the temperature sensitive members 90-1 and 90-2 is in contact with the inner wall of the oil chamber 32 of the inertia ring 30 and the other of the temperature sensitive members 90-1 and 90-2 is out of the oil chamber 32, So that they are placed in the axial direction of the inertia ring 30. Therefore, as long as the oil 80 filling the inner chamber 13 of the casing 10 is not elevated to the deterioration temperature, the bearing gap La between the inertia ring 30 and the cover side of the cover 20, The bearing clearance Lb of the casing 30 of the case 10 is kept constant at a predetermined value. On the other hand, the temperature sensitive members 90-1 and 90-2 push the inertia ring 30 toward the cover 20 with a repulsive force in accordance with the constraint of the case 10 when the temperature of the oil 80 expands due to the temperature rise of the oil 80 I will.

In particular, the temperature sensitive members 90-1 and 90-2 are wax-type thermostats filled with wax and operate in excess of the compression load of the springs. For example, the wax-type thermostat is wax-sealed in a metal case, and when the ambient temperature reaches the set temperature value, the wax melts to enlarge the volume. Due to the increase in the volume of the wax, the thermostat flanger is raised. The thermostat, which has been opened at the set temperature, is fully opened at a higher temperature and the return spring closes the valve when the temperature falls below the set temperature. Therefore, the temperature sensitive members 90-1 and 90-2 may be a thermostat that is applied to the water-cooling system of the vehicle engine and opens / closes the cooling water circulation line passage of the engine and the radiator due to the engine cooling water temperature change.

On the other hand, Fig. 3 shows an example of operating conditions of the local damper 1.

As shown in the figure, when the operation region of the engine is divided into low speed / low load, middle speed / heavy load, and high speed / high load, the rotation range of the crankshaft 100 is the engine RPM at low speed / low load, Engine RPM and high speed / high load engine RPM. The temperature range of the localized damper (1) is 0 ~ 50 ℃ for low speed / low load, 50 ~ 80 ℃ for medium speed / heavy load, 80 ~ 118 ℃. At this time, the temperature region of the local damper 1 is an example of a measured result obtained by attaching a thermometer to the surface of the case 10 or the cover 20 without contact. Therefore, the main operation region of the localized damper 1 is set to a low middle / low load, and the expansion temperature of the temperature sensitive members 90-1 and 90-2 is set to about 80 DEG C or more.

For example, the temperature of the damper surface of the local damper 1 under low to medium / low load of the engine is maintained at a temperature condition of about 80 캜 or less without deterioration of the oil 80, 2 is not melted by the oil 80 and the viscosity of the oil 80 is not lowered so that the bearing gap La between the inertia ring 30 and the cover 20 on the cover 20 and the bearing gap La And the case-side bearing clearance Lb of the case 10 are kept unchanged, thereby exhibiting the designed damping performance.

On the other hand, at the high speed / high load of the engine, the damper surface temperature of the local damper 1 changes to a temperature condition of about 80 캜 or more, which causes deterioration of the oil 80, The length of the molten wax increases with the swelling. The temperature sensitive members 90-1 and 90-2 push the inertia ring 30 toward the cover 20 by the repulsive force of the case 10 so that the inertia ring 30 and the cover 20 The bearing gap La on the cover side is changed to La-1 reduced by the approach distance of the inertia ring 30 so that the relative speed between the inertia ring 30 and the case 10 / cover 20 is lowered by the increased frictional force, 30 and the casing side bearing clearance Lb of the case 10 is changed to Lb-1 increased by the throttle distance of the inertia ring 30, thereby reducing oil deterioration with an increased amount of heat radiation. As a result, the torsion damper 1 quickly lowers the temperature of the oil 80 to 80 ° C or less while simultaneously matching the damping performance to the designed damping performance by increasing the frictional force even at a temperature of 80 ° C or higher. This is because the viscosity change due to the deterioration of the oil 80 is controlled only by the bearing clearance due to the volume expansion of the temperature responsive members 90-1 and 90-2 so that the damping performance of the local damper 1 is controlled by the high speed / It means that it is matched in the optimal state in the region.

As described above, the local damper 1 compensates the damping performance deterioration caused by the deterioration of the oil 80 by the bearing clearance adjusted by the length change due to the expansion of the temperature sensitive members 90-1 and 90-2, The same advantages can be achieved.

First, the surface temperature of the localized damper (1) is adjusted to 80 ° C instead of the existing condition developed within 120 to 130 ° C in consideration of deterioration of the silicone oil, so that the temperature of the silicone oil can be reduced under the same operating conditions. Second, the use of low-viscosity oil by lowering the temperature of the silicone oil reduces the cost of using the low-viscosity oil. Third, durability improvement is achieved by optimizing the damping performance of the local dampers (1) in all areas, such as high speed / high load areas where engine performance is maximized, as well as low / medium / . Fourth, the size and weight of the local damper 1 are reduced by reducing the temperature of the silicone oil.

4 shows a crank shaft 100 to which the local damper 1 is applied. As shown, the crankshaft 100 connects the local damper 1 to the crank nose 100-1. The local damper 1 includes a case 10, a cover 20, an inertia ring 30, an inner bearing 50, thrust bearings 70-1, 70-2, 70-3, Silicone oil 80, and temperature sensitive members 90-1 and 90-2. Therefore, the local damper 1 is the local damper 1 described with reference to Figs. The crank nose 100-1 of the crankshaft 100 is fitted into the shaft holes 11b and 21b of the case 10 and the cover 20 and fixed by bolt fastening using the case fastening holes 11a and 21a, The shaft 100 and the local damper 1 are integrated. In particular, the crankshaft 100 is applied to a commercial engine.

5 is a torsional vibration (TOR) of the local damper 1. This is an experimental example in which the crankshaft 100 connected with the local damper 1 is driven together with the engine, The surface temperatures of 50 ° C and 80 ° C are measured with a thermometer attached to the surface of the damper.

As can be seen from the graph, the TV value at the surface temperature of 80 ° C is 0.210, while the TV value at the surface temperature of 50 ° C is 0.178, and the TV value according to the temperature difference of 30 ° C is 0.033deg difference. Therefore, it is proved that the TV is improved in the state-of-the-art damper 1 in which the deterioration temperature of the oil 80 is adjusted to 80 DEG C or lower in conjunction with the temperature responsive members 90-1 and 90-2.

As described above, the local damper 1 according to the present embodiment comprises a housing 10 constituted by a case 10 and a cover 20, which are joined together to form an inner chamber 13 filled with oil 80 in an 80% An inertia ring 30 accommodated in the inner chamber and generating a relative motion with respect to the case 10 and the cover 20, a thrust bearing 30 provided on both left and right sides of the inertia ring 30 to form bearing gaps La and Lb, (70-1, 70-2, 70-3, and 70-4) and the inertia ring (30), the inertia ring (30) is moved in the axial direction during the deterioration of the oil (80) 90-2. Therefore, the local dampers 1 are installed in the temperature sensitive members 90-1 and 90-2 under the high-speed / high-load condition of the engine which causes deterioration of the oil 80 when applied to the crank shaft 100, The damping performance can be optimized in the same manner as the low-middle-speed / low-load load by changing the bearing clearances La and Lb, and in particular, It is possible to lower the local vibration by as much as the silicon temperature reduction, and the cost of using the low viscosity oil is also reduced.

1: Local damper 10: Case
11: shaft direct coupling flange 11a: case fastening hole
11b, 21b: shaft hole 13: inner chamber
20: Cover 20a: Cover fastening hole
30: inertia ring 31: bearing groove
32: Oil chamber 50: Inner bearing
70-1, 70-2, 70-3, 70-4: 1st, 2nd, 3rd, 4th thrust bearings
80: oil 90-1, 90-2: first and second temperature-
100: crankshaft
101-1: Crank nose

Claims

The inertial ring is axially moved so as to reinforce the frictional force between the inertial ring and the housing weakened by the deterioration of the oil, wherein the inertial ring is axially moved with the inertial ring in the inner chamber of the sealed housing filled with 80% A temperature responsive member for generating an axial movement of the ring by expansion due to the deterioration temperature of the oil;
Wherein the temperature sensing type damper is a temperature sensitive type damper.

[3] The temperature sensitive type dental damper according to claim 1, wherein the expansion is caused by wax melting at the deterioration temperature of the oil, and the deterioration temperature of the oil is 80 deg.

[3] The temperature sensitive type dental damper of claim 2, wherein the wax is applied to a thermostat, and the thermostat is the temperature sensitive member.

[3] The temperature sensitive type dental damper of claim 1, wherein the temperature responsive member comprises a plurality of temperature sensitive members arranged symmetrically with respect to the center of the inertial ring.

[4] The temperature sensitive type dental damper of claim 4, wherein the inertia ring is formed with a plurality of oil chambers filled with the oil, and each of the oil chambers receives the temperature responsive member.

[7] The temperature sensitive type dental damper of claim 5, wherein the oil chamber is formed on both sides of the inertia ring, and the temperature sensitive member is accommodated.

The temperature sensitive type dental damper according to claim 5, wherein a plurality of oil chambers are formed in the circumferential direction of the inertia ring, and the temperature sensitive members are respectively received.

The temperature sensitive type dental damper of claim 4, wherein a plurality of thrust bearings are arranged in the axial direction in the inertia ring, and the temperature sensitive member is positioned between the thrust bearings.

The bearing of claim 1, wherein the housing comprises a case and a cover, the inertial ring and the cover form a bearing gap in the cover side, the inertia ring and the case form a bearing gap in the case side, And the bearing gap between the case and the inertia ring is changed by the axial movement of the inertia ring.

[12] The temperature sensitive type dental damper of claim 9, wherein a shaft hole is drilled at the center of the case and the cover.

The temperature sensitive type dental damper according to claim 1, wherein the oil is silicone oil.

A tertiary damper having components according to any one of claims 1 to 11.
A crank nose integrally provided to a crank shaft rotated by an engine and connected to the local damper;
And a crankshaft.

13. The crankshaft of claim 12, wherein the crank nose and the local damper are bolted together.

The crankshaft according to claim 12, wherein the engine is a commercial engine.