JPH10184799A - Speed increasing pendulum type motion absorber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively reduce the torsional vibration of a rotary shaft by providing a speed increasing mechanism for increasing the revolution of the rotary shaft in the end section of the rotary shaft and mounting a disk provided with a pendulum mechanism on the output shaft of the speed increasing mechanism. SOLUTION: A pendulum type motion absorber 4 is connected to the end section of a crank shaft 1 through a speed increasing mechanism 3. This pendulum type motion absorber 4 is provided with a carrier disk 4a and pendulum mechanism 4b, and the carrier disk 4a is attached to a sun gear 3a through bolts 11. When a pendulum vibrates a micro amplitude angle, the centrifugal force working on the weight of the pendulum generates composite force in the radial direction of the pendulum besides the centrifugal force in the external peripheral direction of the carrier disk 4a. This force becomes the torque given to the carrier disk 4a and cancels the torque reaction of torsional vibration, removing and controlling vibration.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pendulum type dynamic vibration absorber for suppressing vibration of a rotating body, and more particularly to a speed-increasing pendulum type dynamic vibration absorber.

[0002]

2. Description of the Related Art Generally, torsional vibrations occur on a rotating shaft (rotating body) such as a crankshaft of an engine during rotation. This torsional vibration is free vibration that vibrates around an equilibrium state (balance position) due to the action of the inertial force and the restoring force. If such vibration continues, the amplitude increases and the function of the rotating body is reduced. It can be seriously damaged.

For this reason, a vibration absorber or damper is usually attached to a vibrating system to attenuate the vibration. A constant-speed dynamic damper, a variable-speed dynamic damper, or the like is used for such a vibration absorber (damper). The constant-speed dynamic damper is a sub-vibration system attached to the main vibration system. When the natural frequency of the main vibration system is ω ₁ and the natural frequency of the sub-vibration system is ω ₂ , ω ₁ = ω ₂ . It is set to be.

Therefore, when the angular displacement λ of the main vibration system is equal to the angular displacement ν of the sub-vibration system, that is, when ω ₁ / ω ₂ = 1, the amplitude ratio becomes zero. Therefore, it is very effective as a vibration absorber of a shaft rotating at a constant speed. However, when the rotational speed constantly fluctuates and the displacement λ of the main vibration system changes over a wide range, such as the crankshaft of an engine, such a constant-speed dynamic damper is effectively used as a vibration absorber. Does not work.

Therefore, as a vibration absorber for a rotating shaft such as a crankshaft of an engine, the natural frequency ω ₂ of the auxiliary vibration system is set so as to be proportional to the natural frequency ω ₁ of the main vibration system.
A variable speed dynamic damper has been proposed in which the amplitude ratio A is set to 0 over the entire range of the natural frequency ω ₁ in the main vibration system. As an example of the variable speed dynamic damper, there is known a pendulum type dynamic vibration absorber in which a pendulum for avoiding resonance of the main vibration system is attached to a rotating body of the main vibration system to rotate integrally. In this pendulum type dynamic vibration absorber, the natural frequency ω ₁ of the main vibration system is 1
By adjusting the frequency ω ₂ of the sub-vibration system to the frequency of / n, the natural frequency of the main vibration system is reduced to the n-th order amplitude even if the rotation speed of the main vibration system changes. Accordingly, periodic torsional vibration having a frequency 1 / n times the natural frequency ω ₁ in the main vibration system is suppressed.

[0006]

In such a conventional pendulum type dynamic vibration absorber, the distance from the center of the disk (carrier disk) on which the pendulum is mounted to the pendulum fulcrum is R, the angular velocity of this disk is Ω, and the pendulum is Assuming that the mass of the weight is m, the following relationship holds: R ² = k ₁ / (m · Ω ² ), k ₁ : proportionality constant. Therefore, in order to absorb the torsional vibration of the rotating body at the time of low rotation (when Ω is small), increase the radius of the disk to increase the distance R to the pendulum fulcrum, or increase the mass m of the pendulum. Need to be bigger.

However, when the size of the disk is increased or the weight of the pendulum is increased, there is a problem that the dynamic vibration absorber itself becomes large. In particular, when the rotating body is a crankshaft of an engine, there is a problem that the mountability to an engine or the like is reduced due to an increase in the size of the dynamic vibration absorber. In addition,
No. 40350, Japanese Utility Model Application Laid-Open No. 1-115040, Japanese Utility Model Application Laid-Open No. 1-115041 and Japanese Utility Model Application Laid-Open No. 1-111504.
No. 2 Publication and the like also disclose a technique for reducing vibration of a rotating body using a pendulum mechanism, but none of these techniques can solve the above-described problems. Did not.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and a centrifugal pendulum in which torsional vibration of a rotating shaft can be efficiently reduced without increasing the weight of a disk or a pendulum. It is an object of the present invention to provide a dynamic vibration absorber.

[0009]

According to a first aspect of the present invention, there is provided a speed-increasing pendulum type dynamic vibration absorber according to the first aspect of the present invention, which is disposed at an end of a rotating shaft whose rotational speed fluctuates. , A disc attached to the output shaft of the speed increasing mechanism, and a pendulum mechanism arranged on the disc.

According to a second aspect of the present invention, there is provided a speed-increasing pendulum type dynamic vibration absorber according to the present invention, wherein a plurality of the pendulum mechanisms are provided on the disk, and the pendulum mechanism comprises: It is characterized by being arranged at equal distances from the center of rotation of the disk. According to a third aspect of the present invention, there is provided a speed-increasing pendulum type dynamic vibration absorber according to the first aspect, wherein the rotating shaft is configured as a crankshaft of an engine, and the speed increasing mechanism is connected to an input shaft. The output shaft is configured as a planetary gear mechanism formed coaxially.

According to a fourth aspect of the present invention, there is provided a speed increasing type pendulum type dynamic vibration absorber according to the third aspect of the present invention, wherein a driving force is transmitted to one end of the crankshaft to a driving wheel of a vehicle. And a speed increasing mechanism is disposed on the other end side of the crankshaft, and an auxiliary drive system for driving an auxiliary machine of the engine from an output shaft of the speed increasing mechanism. The driving force of the engine is transmitted.

According to a fifth aspect of the present invention, in addition to the structure of the third aspect, the speed-increasing pendulum type dynamic vibration absorber of the present invention transmits a driving force to a driving wheel of a vehicle at one end of the crankshaft. A power transmission mechanism is connected between the crankshaft and the power transmission mechanism, and the speed increasing mechanism and the disk are arranged between the crankshaft and the power transmission mechanism.

[0013]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
The speed-increasing pendulum type dynamic vibration absorber according to the embodiment will be described. As shown in FIG. 3, one side (left side in the figure) of the engine 20 is provided with a driving wheel of a vehicle (not shown) for driving the rotation of the engine 20. A transmission mechanism (transmission or transmission) 21 for transmitting power to the vehicle is provided,
The rotational driving force of the engine 20 is
, Through the propeller shaft 22 to drive wheels.

An accessory drive system 23 for driving accessories such as a fan 23a is provided on the other side (the right front side in the figure) of the engine 20. The pendulum type dynamic vibration absorber 4 is provided between the auxiliary drive system 23 and the engine 20.
Is provided. That is, as shown in FIG. 1, a speed increasing mechanism 3 is provided at an end of the crankshaft 1 as a rotation shaft.
A pendulum-type dynamic vibration absorber 4 is connected via the .Primary-mechanism, and the rotational speed of the crankshaft 1 is increased by the speed increasing mechanism 3 and transmitted to the pendulum-type dynamic vibration absorber 4. That is, the pendulum type dynamic vibration absorber 4 is
It rotates at a higher speed than the number of rotations.

The speed increasing mechanism 3 is configured as a planetary gear type (planetary gear type) speed increasing mechanism. A sun gear 3a as an output shaft and a pinion carrier 3c as an input shaft are coaxially arranged. Have been. A plurality of pinion gears 3b are rotatably supported by the pinion carrier 3c via roller bearings 5 and 6, and each of the pinion gears 3b meshes with a ring gear 3d and a sun gear 3a, respectively. Here, the roller bearing 5 is a thrust bearing for supporting a thrust load acting in the rotation axis direction of the pinion gear 3b, and the roller bearing 6 is arranged in a direction perpendicular to the rotation axis of the pinion gear 3b. A radial bearing for supporting an acting load.

The pinion carrier 3c is fixed to the end of the crankshaft 1 by bolts 10 as shown, while the ring gear 3d is fixed to the cylinder block 2 via a bracket 7. . Therefore, when the crankshaft 1 rotates, the pinion carrier (input shaft) 3c rotates integrally with the crankshaft 1. At this time, the revolving motion of the pinion carrier 3c and the rotation of the pinion gear 3b due to the engagement with the ring gear 3d are added to the pinion gear 3b, whereby the rotation speed of the pinion carrier 3c is increased in the sun gear (output shaft) 3a. It is transmitted.

Although not shown in detail, the engine 20
The driving force of the engine 20 is transmitted from the sun gear 3a of the speed increasing mechanism 3 to the accessory driving system 23 (see FIG. 3) for driving the accessory 23a. The shaft 1 is driven at a higher rotation speed than the rotation speed. A roller bearing 8 for supporting a load in the thrust direction and a ball bearing 9 for supporting a load in the radial direction are provided between the sun gear 3a and the pinion carrier 3c.

Next, the pendulum type dynamic vibration absorber 4 will be described. The pendulum type dynamic vibration absorber 4 is conventionally known, and in the first embodiment, a rolling pendulum (Roller-type) is used.
pendulum). As shown in FIGS. 1 and 2, the pendulum type dynamic vibration absorber 4 is provided with a carrier disk (disk) 4a and a pendulum mechanism 4b. The carrier disk 4a is attached to the sun gear 3a via bolts 11. ing.

A plurality of pendulum mechanisms 4b are provided on the carrier disk 4a.
As shown in FIG. 2, the carrier disks 4a are arranged at equal distances from the rotation center of the carrier disk 4a (that is, the rotation center of the crankshaft 1).
It is arranged at a position shifted by 90 ° from the center of a.

A pendulum mechanism (rolling pendulum) 4b
As shown in FIG. 2, a roller 40 functions as a pendulum weight and a rolling chamber 41 that houses the roller 40. The roller 40 functions as a pendulum by rolling in the rolling chamber 41. It is supposed to. Now, the operating principle of such a pendulum type dynamic vibration absorber 4 and the reason why the pendulum type dynamic vibration absorber 4 is attached to the crankshaft 1 via the speed increasing mechanism 3 will be described. First, the principle of the centrifugal pendulum type dynamic vibration absorber 4 will be described with reference to FIG.
This will be briefly described with reference to FIG. Although FIG. 4 illustrates the case of a simple pendulum (Simple pendulum),
The principle is the same even if the type of the pendulum mechanism is different.

The pendulum-type dynamic vibration absorber 4 is configured to make the frequency of an arbitrary order of the torsional vibration coincide with the frequency of the pendulum to resonate the pendulum. The pendulum is attached to a rotating body (a disk or a carrier disk 4a). When the carrier disk 4a rotates, the pendulum performs a periodic motion by a centrifugal force (P _centrif. ) _Acting on an outer peripheral direction of the carrier disk 4a.

[0022] Here, when the pendulum oscillates by a small amplitude angle theta _1, the centrifugal force acting on the weight of the pendulum, in addition to the pendulum radial component of the centrifugal force in the outer peripheral direction of the carrier disc _4a (P _centrif.) Force (P ^* _centrif. ). This force becomes the torque (b ^* × P ^* _centrif. ) _Applied to the carrier disk 4a, cancels the torque reaction force of the torsional vibration, and eliminates and suppresses the vibration.

Therefore, when the centrifugal force is large, that is,
Vibration absorbing effect becomes large when the amplitude angle theta ₁ and the pendulum when the distance from the center O of rotation is fast or when the carrier disc 4a of the carrier disc 4a to the center M of the weight is large is large. That is, in order to enhance the vibration absorbing effect, the diameter of the carrier disk 4a may be increased or the mass of the weight may be increased. However, since the magnitude of θ ₁ must be in a region where the period of the pendulum can be regarded as linear,
The magnitude of the amplitude angle is limited (± θ ₁ = 30 ° at maximum)
degree).

However, if the diameter of the carrier disk 4a is increased or the mass of the weight is increased, the dynamic vibration absorber 4 itself becomes large, and such a dynamic vibration absorber 4 is applied to the crankshaft 1 of the engine 20. If you do
There was a problem with the mountability. Next, a description will be given of the force balance in the state as shown in FIG. 4. Assuming that the distance from the center of the carrier disk 4a to the fulcrum of the pendulum is R, the angular velocity of the carrier disk 4a is Ω, the mass of the pendulum is m ₁ , and the length of the pendulum arm is r, the centrifugal force acting on the pendulum is when the amplitude angle theta ₁ is small in can be represented by _{P centrif. = m 1 · Ω} 2 · (R + r) ··· (1).

The reaction torque T _{react. Which} the carrier disk 4a receives due to the vibration of the pendulum is T _react. = B ^* × P ^* _centrif .... (2), and the amplitude angle θ _{1 of the} pendulum is a small angle. Then, b ^* = R · θ ₁ , P ^* _centrif. = P _{centrif ..} (3) Therefore, T _react. = R · θ ₁ × m ₁ · Ω ² · (R + r) (4)

When the weight of the weight is W ₁ and the gravitational acceleration is g, m ₁ = W ₁ / g (5) On the other hand, from equation (4), m ₁ = T _react./[Ω ² (R + r) Rθ ₁ ] (6), and from equation (6) and equation (5), W ₁ = (T _react. × g) / [Ω ² (R + r) Rθ ₁ ] (7)

By the way, the center O of the carrier disk 4a is
Assuming that the distance from the center to the center M of the weight is L, the restoring force (T _res ) of the pendulum in the centrifugal force field is, when θ ₁ and φ are small, _Tres = m ₁ · Ω ² · L · h ≒ m ₁ Ω ² · (R + r) · h (8) h = R · sin φ ≒ R · φ (9) h = r · sin (θ ₁ -φ) = r · (Θ ₁ -φ) ··· (10) From these equations (9) and (10), R · φ = r · (θ ₁ -φ) = r · θ ₁ -r · φ · · ( 11) (R + r) · φ = r · θ ₁ (12) φ = [r / (R + r)] · θ ₁ (13) Δh = [R · r / (R + r)] · θ ₁ ... (14)

Here, when the equation (14) is substituted into the equation (8), _Tres = m ₁ · Ω ² · (R + r) · [R · r / (R + r)] θ ₁ = m ₁ · Ω ² · R · r · θ ₁ (15) On the other hand, the dynamic stiffness is: K _p = T _res / θ ₁ = m ₁ · Ω ² · R · r (16) The resonance angular velocity ω _{P of the} pendulum is the moment of inertia of the weight J _P. = M ₁ · r ² , ω _P ² = K _p / _JP = (m ₁ · Ω ² · R · r) / (m ₁ · r ² ) = Ω ² · (R / r) ···・ ・ (17)

Here, assuming that the natural frequency of the crankshaft 1 is ω _E and the torsional vibration component of the crankshaft 1 is n, the n-order frequency Ω of the carrier disk 4a is Ω = ω _E / n · ... (18) Therefore, equation (18) is replaced with equation (1)
7), ω _P ² = (ω _E ² / n ² ) · (R / r) (19), and when ω _P = ω _E , n ² = R / r ··· (20)

Therefore, this equation is a condition for resonance with the n-th order vibration. By the way, as shown in the equation (4), the torque reaction force received by the carrier disk 4a due to the vibration of the pendulum is: T _react. = R · θ ₁ × m ₁ · Ω ² · (R + r) = Ω ² · (R ² + Rr) · θ ₁ · m ₁ (21) From equation (21), R ² + Rr = T _react./(Ω ² · θ ₁ · m ₁ ) (22) From equation (20), r = R / n ^{2 is obtained} , which is expressed by equation (2)
Substituting into 2), R ² + R ² / n ² = T _react. / (Ω ² · θ ₁ · m ₁ ) R ² (1 + 1 / n ² ) = T _react. / (Ω ² · θ ₁ · m ₁ ) ∴R ² = T _react. / _{^{[(Ω 2 · θ 1 · m}} 1) · (1 + 1 / n 2) ] ...... (23) here, when the combined resonant frequency to a degree, θ ₁ ,
Since m ₁ , n, and T _react. can be considered as constants, R ² = k · (1 / Ω ² ) k: proportional constant (24)

Therefore, the diameter R of the carrier disk 4a is
It can be seen that the carrier disk 4a can be reduced in size by increasing the angular velocity Ω of the carrier disk 4a. Therefore, in the present invention, the speed increasing mechanism 3 is provided between the crankshaft 1 and the pendulum type dynamic vibration absorber 4,
By increasing the rotation speed of the carrier disk 4a, a large centrifugal force is applied to the pendulum, and a large effect is obtained while the pendulum type dynamic vibration absorber 4 is downsized.

FIG. 5 shows the equation (24) using the following equation.
The graph shows the relationship between the radius R of the carrier disk 4a and the speed increase ratio (corresponding to the angular velocity Ω of the carrier disk 4a).
That is, it is understood that the radius R of the carrier disk 4a can be reduced in inverse proportion by increasing the angular velocity Ω of the carrier disk 4a.

In the above description, as shown in FIG. 4, the pendulum mechanism 4b is a single pendulum. In the case of a rolling pendulum, the diameter d of the roller 40 and the diameter of the rolling chamber 41 are calculated in the calculation process. Although parameters such as D will be involved, eventually the same equation as equation (24) can be derived. In this case, the length r of the pendulum arm can be expressed as (D−d) / 2.

Since the speed-increasing pendulum type dynamic vibration absorber according to the first embodiment of the present invention is configured as described above, the rotational driving force of the engine 20 is transmitted from one end of the crankshaft 1 to the transmission 21. The power is transmitted to the driving wheels via the flapper shaft 22. On the other hand, the rotation speed of the crankshaft 1 is increased through a speed increasing mechanism 3 provided on the other end side of the crankshaft 1 and transmitted to the pendulum type dynamic vibration absorber 4. Thereby, the vibration of the crankshaft 1 is reduced, and the quietness is also improved.

Here, as described with reference to the above equation (24) and FIG. 5, when the resonance frequency of a certain order is reduced, the radius R of the carrier disk 4a and the angular velocity Ω of the carrier disk 4a are inversely proportional. In relation, the radius R of the carrier disk 4a can be set small by increasing the angular velocity (that is, the number of revolutions) Ω of the carrier disk 4a.

Therefore, in the speed-increasing pendulum type dynamic vibration absorber of the present invention, the pendulum type dynamic vibration absorber 4 is mounted via the speed increasing mechanism 3 so as to increase the rotation speed of the pendulum type dynamic vibration absorber 4. By doing so, there is an advantage that the pendulum type dynamic vibration absorber 4 can be made smaller than the conventional one. Specifically, there is an advantage that the size and weight of the carrier disk 4a can be reduced, thereby improving the mountability on a vehicle.

The output shaft (sun gear) 3a is connected to an accessory drive system 23 for driving accessories such as a fan 23a, so that the rotational speed of the pendulum type dynamic vibration absorber 4 is increased. At the same time, the driving speed of the accessories can be increased, and there is an advantage that the driving efficiency of the accessories is improved. Further, as shown in FIG. 2, by disposing a plurality of pendulum mechanisms 4b at equal distances from the center of rotation of the carrier disk 4a, a balanced dynamic vibration absorber 4 can be provided, and the vibration absorbing effect can be further improved. There is also the advantage that it can be increased.

The speed-increasing pendulum type dynamic vibration absorber of the present invention is not limited to the configuration of the first and second embodiments described above. For example, as shown in FIG.
The pendulum type dynamic vibration absorber 4 may be provided between the engine 20 and the transmission 21. in this case,
The input shaft 3a and the output shaft 3c of the speed increasing mechanism 3 are arranged coaxially with the input shaft (not shown) of the transmission 21 and the flywheel (not shown) has the function of the carrier disk 4a. Therefore, there is an advantage that the pendulum type dynamic vibration absorber 4 can be further reduced in size, and the mountability of the vehicle can be further improved.

Further, the torque converter or the clutch mechanism (both not shown) of the transmission 21 and the pendulum type dynamic vibration absorber 4 can be integrally formed.
There is an advantage that the mountability of the vehicle can be further improved. Next, a speed-increasing pendulum type dynamic vibration absorber as a second embodiment of the second embodiment of the present invention will be described. In this second embodiment, the pendulum type dynamic vibration absorber 4 is a single pendulum type dynamic vibration absorber. It is configured as

That is, as shown in FIG. 7, a plurality of single pendulum pendulum mechanisms 4b are provided on the carrier disk 4a.
The pendulum mechanisms 4b are disposed at equal distances from the rotation center of the carrier disk 4a (that is, the rotation center of the crankshaft 1).
The carrier disk 4a is disposed at a position shifted by 90 ° from the center of the carrier disk 4a.

The pendulum mechanism 4b has a pendulum weight 42 and a pendulum storage chamber 43 for storing the pendulum 42. The weight 42 swings about a rotation shaft 44 protruding from the storage chamber 43 as a fulcrum. It is configured to be movable. The distance from the rotation shaft 44 to the center of gravity of the weight 42 corresponds to the arm length r shown in FIG. Further, the pendulum type dynamic vibration absorber 4 includes the rank shaft 1 as in the first embodiment.
The bolt 1 is attached to the planetary gear type speed increasing mechanism 3
1, so that the rotation of the crankshaft 1 is increased and the carrier disk 4a is rotated.

Except for this point, the configuration is the same as that of the above-described first embodiment, and a detailed description thereof will be omitted. Since the speed-increasing pendulum type dynamic vibration absorber as the second embodiment of the present invention is configured as described above, the same operation and effect as those of the first embodiment can be obtained.
There is also an advantage that almost no noise is generated by the operation of the dynamic vibration absorber 4 during the rotation of. That is, in the rolling pendulum described in the first embodiment, since the roller 40 rolls in the rolling chamber 41, noise may occur due to the contact between the roller 40 and the rolling chamber 41. In the simple pendulum as described in the above, since the weight 42 swings around the rotation shaft 44 as a fulcrum, the noise accompanying the operation of the dynamic vibration absorber 4 can be reduced.

The speed-increasing pendulum type dynamic vibration absorber of the second embodiment is not limited to the above-described structure. For example, as shown in FIG. A pendulum type dynamic vibration absorber 4 may be provided between them. Also, in any of the first and second embodiments, the speed increasing mechanism 3 may be configured as a speed increasing mechanism using a gear train as shown in FIG.

In this case, a gear 30 is provided at the end of the crankshaft 1 and a gear 31 having a smaller number of teeth than the number of teeth of this gear is mounted on the carrier disk 4a to increase the speed of the pendulum type dynamic vibration absorber 4. And rotate it. According to such a configuration, there is also an advantage that the speed increasing mechanism 3 can be simply and lightly configured, and can be manufactured at low cost.

The speed-increasing pendulum type dynamic vibration absorber is not only applied to the crankshaft 1 but can be widely applied to a rotating shaft (rotating body) whose rotational speed fluctuates. For example, as shown in FIG. 9, the speed increasing mechanism 3 and the pendulum type dynamic vibration absorber 4 may be provided at the end of the camshaft 24 to reduce the vibration of the camshaft 24. Especially,
According to the present invention, since the pendulum type dynamic vibration absorber 4 can be formed in a small size, the present invention is effective even in a case where there are relatively many restrictions on the disposition positions of components such as the cam shaft 24.

In FIG. 9, the speed increasing mechanism 3 is a gear train type. However, the speed increasing mechanism 3 is not limited to such a configuration, and the speed increasing mechanism 3 may be a planetary gear type or a friction drive type. (For example, a toroidal transmission mechanism).

[0047]

As described above in detail, according to the speed-increasing pendulum type dynamic vibration absorber according to the first aspect of the present invention, the speed increasing mechanism for increasing the rotation speed of the rotating shaft at the end of the rotating shaft. Is provided on the rotation shaft, and a disk having a pendulum mechanism is attached to the output shaft of the speed increasing mechanism, whereby the rotation speed of the pendulum type dynamic vibration absorber can be increased, and the pendulum type dynamic vibration absorber can be used. There is an advantage that it can be made smaller and lighter than the conventional one. In addition, there is an advantage that the mountability of the pendulum type dynamic vibration absorber to the vibration source can be improved.

According to the speed-increasing pendulum type dynamic vibration absorber of the present invention, a plurality of pendulum mechanisms are provided on the disk.
By disposing these pendulum mechanisms at equal distances from the center of rotation of the disk, a balanced dynamic vibration absorber can be provided, and there is an advantage that the vibration absorbing effect can be further enhanced. Further, according to the speed-increasing pendulum type dynamic vibration absorber of the present invention, it is possible to reduce the size and weight of the dynamic vibration absorber while greatly reducing the torsional vibration of the crankshaft of the engine. This has the advantage that the mountability on a vehicle can be greatly increased. Further, by configuring the speed increasing mechanism as a planetary gear mechanism, the output shaft and the input shaft can be arranged coaxially, and there is an advantage that the speed increasing mechanism can be formed small.

According to the speed-increasing pendulum type dynamic vibration absorber of the present invention, a driving force transmission mechanism is connected to one end of the crankshaft, and the speed-increasing pendulum is connected to the other end of the crankshaft. By arranging the mechanism so that the driving force of the engine is transmitted from the output shaft of the speed increasing mechanism to the accessory drive system that drives the accessory of the engine, the driving speed of the accessories also increases. Therefore, there is an advantage that the auxiliary equipment driving efficiency is improved.

According to the speed increasing pendulum type dynamic vibration absorber of the present invention, the speed increasing mechanism and the disk are arranged coaxially between the crankshaft and the driving force transmitting mechanism. With such a configuration, there is an advantage that the pendulum type dynamic vibration absorber can be further downsized, and the mountability of the vehicle can be further improved.

[Brief description of the drawings]

FIG. 1 is a diagram showing a main part configuration of a speed-increasing pendulum type dynamic vibration absorber as a first embodiment of the present invention, and is a schematic cross-sectional view along a crankshaft axis.

FIG. 2 is a diagram showing a configuration of a speed-increasing pendulum type dynamic vibration absorber as a first embodiment of the present invention, and is a view as seen in the direction of arrow A in FIG.

FIG. 3 is a side view showing an example of an engine to which the speed-increasing pendulum type dynamic vibration absorber according to the first embodiment of the present invention is applied.

FIG. 4 is a diagram for explaining the principle of a pendulum type dynamic vibration absorber.

FIG. 5 is a diagram showing characteristics of a speed increasing pendulum type dynamic vibration absorber as the first embodiment of the present invention.

FIG. 6 is a side view showing an engine in which the speed-increasing pendulum type dynamic vibration absorber according to the first embodiment of the present invention is disposed near a flywheel.

FIG. 7 is a diagram showing a configuration of a speed-increasing pendulum type dynamic vibration absorber as a second embodiment of the present invention, and is a diagram corresponding to FIG.

FIG. 8 is a diagram showing a modified example of a speed-increasing pendulum type dynamic vibration absorber as a second embodiment of the present invention.

FIG. 9 is a perspective view showing an engine in which the speed-increasing pendulum type dynamic vibration absorber of the present invention is disposed at an end of a camshaft.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Crankshaft as a rotating shaft 2 Cylinder block 3 Speed increasing mechanism 3a Sun gear as an output shaft 3b Pinion gear 3c Pinion carrier as an input shaft 3d Ring gear 4 Pendulum type dynamic vibration absorber 4a Disk (carrier disk) 4b Pendulum mechanism 5, 6, 8 Roller bearing 7 Bracket 9 Ball bearing 10, 11 Bolt 20 Engine 21 Driving force transmission mechanism (transmission or transmission) 22 Propeller shaft 23 Auxiliary drive system 23a Auxiliary equipment 24 Camshaft 40 Roller 41 Rolling chamber 42 Pendulum Weight 43 Pendulum storage room 44 Rotation axis

Claims (5)

[Claims] 1. A speed increasing mechanism disposed at an end of a rotating shaft whose rotational speed fluctuates to increase the rotating speed of the rotating shaft; a disk attached to an output shaft of the speed increasing mechanism; And a pendulum mechanism disposed on the speed increasing pendulum type dynamic vibration absorber. 2. The centrifugal pendulum according to claim 1, wherein a plurality of said pendulum mechanisms are provided on said disk, and said pendulum mechanisms are respectively arranged at equal distances from the center of rotation of said disk. Type dynamic vibration absorber. 3. The rotary shaft is configured as a crankshaft of an engine, and the speed increasing mechanism is configured as a planetary gear mechanism in which an input shaft and an output shaft are formed coaxially.
The centrifugal pendulum type dynamic vibration absorber according to claim 1. 4. A driving force transmitting mechanism for transmitting driving force to driving wheels of a vehicle is connected to one end of the crankshaft, and the speed increasing mechanism is disposed at the other end of the crankshaft. 4. The centrifugal pendulum according to claim 3, wherein a driving force of said engine is transmitted from an output shaft of said speed increasing mechanism to an auxiliary drive system for driving an auxiliary machine of said engine. Type dynamic vibration absorber. 5. A driving force transmitting mechanism for transmitting driving force to driving wheels of a vehicle is connected to one end of the crankshaft, and the speed increasing mechanism and the driving force transmitting mechanism are provided between the crankshaft and the driving force transmitting mechanism. The centrifugal pendulum type dynamic vibration absorber according to claim 3, wherein the disk is provided.