KR101499207B1 - Hydro roll rod - Google Patents

Abstract

More particularly, the present invention relates to a roll load, and more particularly, to a vibration damping device capable of minimizing transmission of vibration to a vehicle body by attenuating low-frequency and large-displacement behavior occurring in a vehicle through a liquid chamber including a fluid in a short period of time, ) Performance of the hydraulic roll.

The present invention as described above can reduce the vibration transmitted to the vehicle because the fluid can absorb the vibration transmitted to the roll rod, and the fatigue of the rear insulator can be reduced to improve the durability, which is very economical. In addition, the fluid passages connecting the liquid chambers inside the two rear insulators are formed so that the fluid can freely move from one liquid chamber to the other liquid chamber, so that vibration and pressure applied to one rear insulator are dispersedly received by the other rear insulator So that it is possible to obtain an improved vibration damping effect.

Roll rod, liquid chamber, hydro

Description

[0001] Hydro roll rod [0002]

More particularly, the present invention relates to a roll load, and more particularly, to a vibration damping device capable of minimizing transmission of vibration to a vehicle body by attenuating low-frequency and large-displacement behavior occurring in a vehicle through a liquid chamber including a fluid in a short period of time, ) Performance of the hydraulic roll.

Generally, the method of attaching the engine and the transmission to the vehicle body can be broadly divided into an inertial support and a center support. The inertial support system is divided into a four-point support system and a three-point support system according to the number of mountings.

In the four-point support system, the engine mount and the transmission mount are located on the upper or side surface of the side member of the vehicle body, and the front and rear roll stoppers are mounted on the sub frame. In contrast, in the three-point support system, the engine mount on one side of the engine and the transmission mount on one side of the transmission are mounted on the upper or side surface of the side member of the vehicle body in the same manner as the four- Instead, the roll load is mounted on a subframe or crossmember.

Recently, it has been necessary to develop the roll load used in the three-point support system by applying the inertial three-point support system to the high-torque engine of medium / large-sized vehicles. The roll load used in the three- And fixed to the power train and the other side is fixed to the subframe.

The powertrain means a series of all devices that transmit power generated by an engine such as a mission, a clutch, a transmission, and a longitudinal decelerator to a drive wheel, and a front insulator of the roll rod is fixed to the powertrain, .

In the meantime, it is common that the roll load described above is more sensitive to insulation of shock and vibration than the front insulator connected to the power train, and accordingly, in the related art, In order to improve the performance of the system.

Accordingly, the conventional bush type roll rod as shown in FIG. 1A includes the rod 1, the front insulator 2 and the rear insulator 3, and can be used for starting / a hydro bush which is commercialized as shown in FIG. 1B is inserted into the rear insulator 3 for attenuating the low frequency large displacement behavior occurring in the vehicle at a short time.

However, since the bush type roll rod uses the anti-vibration rubber as the inner part of the rear insulator 3, it is very vulnerable to the tensile load, so that the durability is very weak.

In order to overcome the durability problem, a dog-type roll rod as shown in FIGS. 2 and 3 is used. The structure of the dog-type roll rod includes a rod 1, a front insulator 2 And the rear insulator 3. The rear insulators 3 are positioned to face each other between the rod 1 and the end plate 5 and the end plate 5 and the rear insulator 3, The end plate 5 and the rear insulator 3 are fixed to the rod 1 by the through bolts 6 passing through the center of the body 3 and the body brackets 3 4) are connected to fix the roll rod to the sub frame of the vehicle body.

The dogbone type rolls have the advantage that the durability is very advantageous because the two rear insulators 3 receive a compressive load in the forward and backward directions when the power train connected to the front insulator 2 is moved in the forward and backward directions.

However, the conventional dog-type rolls have such characteristics that they are susceptible to shocks and vibrations that occur particularly when the vehicle is turned ON / OFF, or when the vehicle suddenly accelerates or stops suddenly. Therefore, The insulation performance of the transmitted vibration and noise is lowered as a whole, and the NVH performance of the vehicle is deteriorated.

In addition, it is difficult to apply the hydro-bush for attenuating the low-frequency and large-displacement behavior generated in the vehicle in a short period of time within the dog-type type roll rod as described above. And complaints about the vibration of the floor and the seat continue, and the durability of the vehicle is weakened and the quality is deteriorated.

SUMMARY OF THE INVENTION [0006] In order to solve the above problems,

The hydro-structure is applied inside the dogbone type roll rod used in the inertial three-point support system to minimize the transmission of vibration to the vehicle body by attenuating the low-frequency large-displacement behavior occurring in the vehicle through the liquid chamber containing the fluid in a short period of time, In addition, the present invention is intended to provide a hydraulic roll load capable of improving the NVH (Noise Vibration Harshness) performance of a vehicle.

According to an aspect of the present invention, there is provided a hydro-

A rear insulator having one side connected to the other end of the rod, a rear insulator having one side connected to the other end of the rod, and a rear insulator connected to the other end of the rod, A body bracket connected to the body of the insulator and fixed to the body, an end plate connected to the other side of the rear insulator, and a through bolt passing through the center of the end plate and the rear insulator, The rear insulator is characterized in that a liquid chamber is formed so as to contain a liquid therein.

An outer nozzle coupled to the inner nozzle to surround the inner nozzle in a part of an outer circumferential surface of the inner nozzle, and an outer nozzle coupled to the outer nozzle and the outer nozzle, And a fluid passage formed between the nozzles and connecting the liquid chambers.

It is preferable that a membrane is provided at a portion where the outer nozzle and a portion of the body bracket face each other and a ring is installed at both ends of the through bolt where the through bolt and the rear insulator contact each other, It is further preferable that a cup is provided at both ends of the rear insulator where the insulator and the body bracket are in contact with each other.

The effect of the present invention having the above-

By extending the inside of the two rear insulators used for the dogbone type roll rod to include the fluid, vibration transmitted to the vehicle can be reduced because the fluid can absorb the vibration transmitted to the roll rod And the durability can be improved by reducing the fatigue of the rear insulator, which is very economical.

In addition, the fluid passages connecting the liquid chambers inside the two rear insulators are formed so that the fluid can freely move from one liquid chamber to the other liquid chamber, so that vibration and pressure applied to one rear insulator are dispersedly received by the other rear insulator So that it is possible to obtain an improved vibration damping effect.

Further, by attaching the membrane, the ring and the cup in a state in which the rubber is vulcanized to the portion where the rear insulator, the through bolt and the body bracket are in contact with each other, even if vibration or high pressure is applied on the large displacement, Leakage can be prevented.

4 is a cross-sectional view of a hydrorol rod 100 according to the present invention. The hydrorol rod 100 according to the present invention includes a rod 10, a front insulator 20 located inside the rod 10, a rear insulator 30 having one side connected to the rod 10, A body bracket 40 connected to the vehicle body from the rear insulator 30, an end plate 50 connected to the other side of the rear insulator 30, and a through bolt 60. Inside the rear insulator 30, And a liquid chamber (31) capable of containing liquid is formed.

The rod 10 is formed in a bar shape having a predetermined length so as to connect the powertrain of the vehicle with the subframe and is preferably made of aluminum or steel so that the rigidity of the rod can be maintained.

The rod 10 may be formed in a circular shape so that the rod 10 can be connected to the power train through the connection portion. The other end of the rod 10 is connected to the rear insulator It is preferable to form a flat and wide bracket shape so as to be connected to the connector 30.

A front insulator 20 is included in the connection portion and a central portion of the front insulator 20 is fixedly coupled to a power train so that the front insulator 20 primarily reduces vibration transmitted from the power train give.

One side of the rear insulator 30 is connected to the other end of the rod 10 and an end plate 50 is connected to the other side of the rear insulator 30 to wrap the rear insulator 30 from both sides It is in the form of. Depending on the cross-sectional shape of the rear insulator 30, the end plate 50 may have various shapes such as a circular shape, an elliptical shape, or a polygonal shape.

The rear insulator 30 is disposed symmetrically with respect to the side surface connected to the rod 10 and the side surface connected to the end plate 50. Each of the rear insulators 30 is hollow Hemispherical shape or the like so as to be able to contain fluid therein.

A body bracket 40 is further connected to the outside of the rear insulator 30. The body bracket 40 serves to connect and fix the sub-frame of the vehicle body with the rear insulator 30. [ The body bracket 40 is positioned between the center portions of the two rear insulators 30 and engages with one side of each of the rear insulators 30 and is connected to the sub frame of the vehicle body through an outwardly projecting protrusion. The body bracket 40 may have various shapes such as a " B "shape or a" B "shape depending on the position of the subframe of the body to be connected.

The end plate 50 and the rear insulator 30 are fixedly connected to the wide and flat bracket portion of the rod 10 through the through bolts 60 passing through the center of the end plate 50 and the rear insulator 30. The penetrating bolt 60 is preferably screwed to the rod 10 with a thread.

Therefore, the rear insulator 30 of the present invention, in which the liquid chamber 31 is formed inside the conventional rear insulator 30 made of only the anti-vibration rubber, has an excellent effect of attenuating vibration and pressure, Since the fluid in the liquid chamber 31 is dispersed in vibration and pressure, the fatigue of the anti-vibration rubber is significantly reduced and the durability can be improved.

An inner nozzle 61 for separating the penetrating bolt 60 from the rear insulator 30 is further coupled to an outer circumferential surface of the through bolt 60. A portion of the outer circumferential surface of the inner nozzle 61 is connected to the inner An outer nozzle 62 is further coupled to the nozzle 61 so as to surround the nozzle 61. Between the inner nozzle 61 and the outer nozzle 62 is provided a spiral or linear fluid passage (63).

The inner nozzle 61 is connected to the rod 10 so as to pass through the respective rear insulators 30. The outer nozzle 62 is connected to the respective rear insulators 30, And the rear insulators 30 are connected to each other.

It is preferable that the fluid passage 63 is formed by machining on the outer surface of the inner nozzle 61 and the fluid is supplied from one liquid chamber 31 to the other liquid chamber 31 through the fluid passage 63 Can be moved. When vibration and pressure are applied to the hydrorol rod 100, it is transmitted to the rear insulator 30, and fluid in the liquid chamber 31 is freely moved through the fluid channel 63 in accordance with the transmitted vibration and pressure. So that it is possible to obtain a vibration and pressure damping effect that is superior to that of the rear insulator 30, which is made of a conventional vibration-proof rubber and prevents vibration.

In particular, even if one rear insulator 30 receives a compressive load, the other rear insulator 30 receives a tensile load in accordance with the movement of the fluid inside. Therefore, when the vehicle is turned on / off, idle, It is possible to attenuate the low frequency large displacement behavior occurring in the vehicle in a short time.

The hydrorol rod 100 according to the present invention has a structure in which a liquid chamber 31 is formed in the rear insulator 30 to store a fluid. Therefore, various devices for preventing fluid leakage are provided between the respective components.

A membrane 32 is preferably provided at a portion where the outer nozzle 62 and part of the body bracket 40 face each other. The membrane 32 divides the liquid chambers 31 and prevents the fluid from leaking out of the liquid chamber 31 and directly vulcanizes the body bracket 40 and the outer nozzle 62 The leakage of the fluid can be prevented. The membrane (32) may be provided at two positions symmetrical to each other along the body bracket (40).

It is preferable that a ring 70 is provided at both ends of the through bolt 60 in which the through bolt 60 and the rear insulator 30 are in contact with each other. The ring 70 prevents the fluid from leaking toward the end of the through bolt 60 passing through the liquid chamber 31 and a ring 70 crammed with rubber is installed at a portion where the through bolt 60 is engaged It is possible to prevent the fluid from leaking by fastening the penetrating bolts 60 in a state where the through bolts 60 are fastened.

It is preferable that a cup 80 is installed at both ends of the rear insulator 30 where the rear insulator 30 and the body bracket 40 are in contact with each other. The cup 80 prevents the fluid from leaking to the joint between the rear insulator 30 and the body bracket 40 and prevents the cup 80 from moving to the body bracket 40 when the rubber is vulcanized to the cup 80. [ (40).

FIG. 5 is a graph showing Dynamic Spring Characteristic and Loss Factor (Tan Delta) as a ratio of load amplitude to displacement amplitude when a conventional dog type roll rod is used, and FIG. (100) is used, the dynamic characteristics of the spring and the loss coefficient are shown. The solid line represents the loss factor (Tan Delta), and the dotted line represents the dynamic spring constant K '.

It can be seen that when using a dogbone type roll rod of the prior art, a change in the dynamic spring characteristic constant value of about 30 kgf / mm to about 35 kgf / mm occurs at a frequency of 10 Hz to 100 Hz. However, when the hydrorol rod 100 according to the present invention is used, a change in the value of dynamic spring characteristic constant of about 32 kgf / mm to about 45 kgf / mm occurs at a frequency of 10 Hz to 100 Hz, Even if vibrations of various frequencies are generated in the hydrorol rod 100, a similar action is performed.

However, the loss factor (Tan Delta) representing the damping performance of the device is expressed by the ratio of the loss modulus, which is energy during recovery to the storage modulus, which is the energy during compression, Values will change significantly within the same frequency range.

When the frequency is between 10 Hz and 100 Hz, the conventional rolls have a loss factor value of about 0.05 to 0.07, while the inventive hydrorol rod 100 has a loss factor value of about 0.04 to 0.15. In particular, when the frequency is about 10 Hz to 40 Hz, the conventional loss coefficient value is about 0.05, while the hydrorol of the present invention has a loss coefficient value of about 0.15 at the maximum, It is possible to attenuate the vibration and pressure transmitted from the power train in a short period of time because the vibration damping effect by the roll load is excellent because the low frequency large displacement behavior generated in the vehicle such as the city can be attenuated in a short time.

Therefore, since the vibration absorbing property is superior to that of the conventional roll rod, the vibration damping effect can be improved even at various frequencies and displacements. Thus, it is possible to reduce complaints about steering, It can contribute to improvement of the quality problem of the vehicle.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventions. Will be clear to those who have knowledge of.

1A is a plan view of a conventional bush type roll rod.

1B is a perspective view showing a hydro bush of a conventional bush type roll rod.

2 is a perspective view showing a dogbone type roll rod which has been used conventionally.

3 is a cross-sectional view taken along the line A-A in Fig.

4 is a cross-sectional view of a hydrorol rod according to the present invention.

FIG. 5 is a graph showing a loss coefficient and a vibration absorbing property which indicate damping performance when a conventional dog type roll rod is used.

6 is a graph showing a loss coefficient and a vibration absorbing property indicating damping performance when the hydro roll rod of the present invention is used.

Description of the Related Art

10: load 11: connection

20: Front insulator 30: Rear insulator

31: liquid chamber 32: membrane

40: Body bracket 50: End plate

60: Through bolt 61: Inner nozzle

62: Outer nozzle 63: Fluid passage

70: ring 80: cup

100: Hydro Rolled Rod

Claims (5)

A rod (10) having a circular connecting portion at one end and connecting the power train and the vehicle body; A front insulator (20) located inside the connection part and fixed to the power train; A rear insulator 30 having one side connected to the other end of the rod 10; A body bracket 40 connected to a center of the rear insulator 30 and fixed to the vehicle body; An end plate (50) connected to the other side of the rear insulator (30); And And a through bolt (60) connected to the rod (10) through the center of the end plate (50) and the rear insulator (30) A liquid chamber 31 is formed in the rear insulator 30 so as to contain liquid therein, An inner nozzle 61 separating the through bolt 60 from the rear insulator 30 along the outer peripheral surface of the through bolt 60; An outer nozzle 62 coupled to the center of the outer peripheral surface of the inner nozzle 61 so as to surround the inner nozzle 61; And A fluid passage (63) formed between the inner nozzle (61) and the outer nozzle (62) and connecting between the liquid chambers (31); (100). ≪ / RTI > delete The method according to claim 1, Further comprising a membrane (32) installed at a portion where the outer nozzle (62) and a part of the body bracket (40) face each other. The method according to claim 1, Further comprising a ring (70) installed at both ends of the through bolt (60) where the through bolt (60) and the rear insulator (30) abut each other. The method according to claim 1, Further comprising a cup (80) installed at both ends of the rear insulator (30) in contact with the rear insulator (30) and the body bracket (40).

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