JPH07293664A - Tortional vibration damping device for torque converter lockup device - Google Patents

Abstract

PURPOSE:To damp tortional vibration having a large displacement angle by using a viscous resistance and also making tortional vibration, having a small displacement angle, difficult to be transmitted in the tortional vibration damping device of a lockup device. CONSTITUTION:A tortional vibration damping device 14 has a driven plate 12, a fluid chamber 24, a slider 25, and a choke part. The fluid chamber 24 is linked to a piston and has a gap extending in a circumference direction. The driven plate 14 is linked to the output side member of a torque converter to have a projection to be inserted into the fluid chamber 24 from the gap. The slider 25 is a cap state slide member, and is arranged relative-movably in a circumference direction into the fluid chamber 24 to be relative-movably engaged, within a given angle range in the circumference direction, with the projection. The fluid in the fluid chamber 24 passes in the choke part by the relative movement between the slider 25 and the fluid chamber 24.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a torsional vibration damping device,
In particular, it relates to a torsional vibration damping device used in a lockup device of a torque converter.

[0002]

2. Description of the Related Art A torsional vibration damping device is
It is used for damping torsional vibration of torque transmitted from the input side rotating body to the output side rotating body, and is used in a damper device such as a clutch disc, a flywheel assembly, and a lockup device of a torque converter. . The torsional vibration damping device of the lock-up device for a torque converter (Japanese Patent Application No. 4-46861) that the applicant has already proposed is as follows.
It is composed of a case that extends in the circumferential direction and is filled with fluid (operating oil of the torque converter) inside, and a slider that is arranged so as to be movable in the circumferential direction in the case. When the case and the slider rotate relative to each other, the fluid flows in the clearance between the two and the viscous resistance generated there produces a desired damping effect.

In this case, since the viscous resistance is used, a large resistance force is generated, and the rigidity of the torsion characteristic is increased. As a result, torsional vibration with a large displacement angle
Effectively damped. However, when a torsional vibration having a small displacement angle (such as a fluctuation in engine rotation during traveling), the torsional vibration is transmitted to the output side as it is. An object of the present invention is to use a viscous resistance in a torsional vibration damping device of a lockup device and make it difficult to transmit torsional vibration having a small displacement angle.

Another object of the present invention is to improve the assemblability of the torsional vibration damping device. Still another object of the present invention is to increase the viscous resistance during torsional vibration with a large displacement angle in the torsional vibration damping device.

[0005]

A torsional vibration damping device according to the present invention is arranged between an input side front cover of a torque converter and a torque converter body, and has a piston capable of press-contacting the front cover. A device used in a torque converter lock-up device including a piston and an elastic coupling mechanism that elastically couples an output side rotating body of the torque converter in a circumferential direction, the arc-shaped fluid chamber, a rotating member, and a cap-shaped sliding member. And a choke part. The arc-shaped fluid chamber is connected to one of the piston and the output side rotating body and has an opening extending in the circumferential direction. The rotating member has a protrusion that is connected to the other of the piston and the output-side rotating body and that is inserted into the fluid chamber through the opening. The cap-shaped slide member is disposed in the fluid chamber so as to be relatively movable in the circumferential direction, and is engaged with the protrusion so as to be relatively movable in the circumferential direction within a predetermined angle range. The fluid in the fluid chamber passes through the choke portion due to the relative movement of the slide member and the fluid chamber.

It is preferable that the slide member integrally has a seal portion for sealing the opening. The fluid chamber is a compartment divided circumferentially by the slide member, the choke portion is formed between the slide member and the fluid chamber, and the seal portion seals the opening of the compartment portion. Is preferred.

[0007]

In the torsional vibration damping device according to the present invention, the torsional vibration is input from the piston to the arc-shaped fluid chamber or the rotating member. When the displacement angle of the torsional vibration is small, the cap-shaped slide member moves in the circumferential direction with respect to the rotating member together with the arc-shaped fluid chamber. At this time, since there is no relative movement between the slide member and the arcuate fluid chamber, viscous resistance is unlikely to occur at the choke portion. Therefore, torsional vibration with a small displacement angle is difficult to be transmitted to the output side. When the displacement angle of torsional vibration is large, the slide member engages with the protrusion of the rotating member,
It moves relative to the arcuate fluid chamber in the circumferential direction. At this time, the fluid flows through the choke portion, causing viscous resistance. Due to this viscous resistance, torsional vibration with a large displacement angle is damped.

When the slide member integrally has the seal portion, the assembling property is improved. When the slide member divides the fluid chamber into the compartments, when the displacement angle of the torsional vibration is large, the fluid flows from one compartment to the other compartment through the choke portion. At this time, since the opening of the compartment is sealed by the seal, a large viscous resistance occurs.

[0009]

1 shows a torque converter 1 to which an embodiment of the present invention is applied. In the figure, O-O is a rotation axis of the torque converter 1, an engine (not shown) is arranged on the left side of the figure, and a transmission (not shown) is arranged on the right side of the figure. The torque converter 1 mainly includes a torque converter body 2 and a lockup device 3. The front cover 4, which is connected to an engine-side member (not shown), has a cylindrical protrusion 4a on the outer peripheral portion that protrudes toward the transmission.
a is fixed to the impeller shell 5 a of the impeller 5. The front cover 4 and the impeller shell 5a form a hydraulic fluid chamber filled with hydraulic fluid.

The torque converter body 2 includes an impeller 5
And a turbine 6 driven by the flow of fluid from the impeller 5, and a stator 7. The inner peripheral end of the impeller shell 5a of the impeller 5 is fixed to the impeller hub 5c. A plurality of impeller blades 5b are fixed inside the impeller shell 5a. A turbine 6 is arranged at a position facing the impeller 5. The turbine 6 is composed of a turbine shell 6a and a plurality of turbine blades 6b fixed to the turbine shell 6a. The inner peripheral end portion of the turbine shell 6a is fixed to the flange portion 8a of the turbine hub 8 by a plurality of rivets 9. The turbine hub 8 has a spline hole 8b on the inner peripheral side that engages with an input shaft (not shown) of the transmission.

A stator 7 is arranged between the inner peripheral portion of the impeller 5 and the inner peripheral portion of the turbine 6. Stator 7
Adjusts the direction of the hydraulic oil returned from the turbine 6 to the impeller 5 to increase the torque ratio. The annular stator carrier 7a and a plurality of stator blades 7b provided on the outer peripheral surface of the stator carrier 7a. It consists of and. The stator carrier 7a is connected to the inner race 10 via a one-way clutch mechanism. The inner race 10 is connected to a fixed shaft (not shown) extending from the transmission side.

The lockup device 3 includes a front cover 4
And the turbine 6. The lockup device 3 includes a disk-shaped piston 11, a driven plate 12, a piston 11 and a disk-shaped driven plate 1.
Elastic connection mechanism 13 for elastically connecting 2 and 2 in the circumferential direction
And a torsional vibration damping device 14 for damping the torsional vibration between the piston 11 and the driven plate 12.

The piston 11 has an inner peripheral end in the radial direction supported by the outer peripheral surface of the turbine hub 8 slidably in the axial direction and the circumferential direction. On the outer peripheral portion of the piston 11, a friction member 1 having an annular shape is provided on a surface facing the friction surface 4b of the front cover 4.
5 is glued. The piston 11 has a cylindrical outer peripheral wall 11a that extends axially rearward (rightward in FIG. 1) at the outer peripheral end. A plurality of notches 11b are formed in the outer peripheral wall 11a at equal intervals in the circumferential direction.

The driven plate 12 is a disk-shaped member, and has a plurality of protrusions 12a radially outwardly protruding at the outer peripheral end.
Are formed at equal intervals in the circumferential direction. The inner peripheral end of the driven plate 12 is fixed to the flange portion 8 a of the turbine hub 8 by the rivets 9. Torsional vibration damping device 1
As shown in FIGS. 1 and 2, reference numeral 4 denotes a pair of first and second side plates 20 and 2 arranged at a predetermined interval.
1, a pair of first and second cases 22 and 23 forming the fluid chamber 24, and a slider 25 slidably arranged inside the fluid chamber 24.

The first side plate 20 and the second side plate 21 have protrusions 20b, 21b (see FIGS. 2 and 3) on the outer periphery at predetermined intervals in the circumferential direction. The protrusions 20b and 21b are fixed to each other by a plurality of rivets 26 and are engaged with the notch 11b of the piston 11 so as to be slidable in the axial direction. Also, both side plates 2
The inner peripheral ends of 0 and 21 are fixed by stopper pins 27. The stopper pin 27 has a body portion having a predetermined length in the axial direction, and the body portion determines the axial distance between the inner peripheral portions of the pair of side plates 20 and 21.

The driven plate 12 is formed with a circumferentially elongated hole 12c into which the stopper pin 27 is inserted. Therefore, the side plates 20 and 21 and the driven plate 12 are relatively rotatable within a predetermined angle. The piston 1 is provided on the outer peripheral portion of the first side plate 20.
The groove portion 20a protruding to the first side is formed in a circumferential shape.
A plurality of arc-shaped fluid chambers 24 are arranged in an arc shape in the space between the circumferential groove 20 a and the second side plate 21. Each arc-shaped fluid chamber 24 is composed of a pair of a first case 22 and a second case 23. A stud pin 28 extends axially through the space where the cases 22 and 23 are arranged. Therefore, the expansion of the space in the axial direction is restricted by the stud pin 28.

As shown in FIGS. 4 and 5, the first case 22 is formed in an arc shape and has a U-shaped cross section. The side surface of the first case 22 on the side of the second case 23 is open, and the lower wall 22a has an axial length of 1/2 or less as compared with the upper wall 22b. Also, this first case 2
Support blocks 22c are formed at both circumferential ends of the stud 2, and the stud pins 28 are formed on the support blocks 22c.
A semi-circular cutout 22d is formed through which is inserted.

On the other hand, as shown in FIGS. 6 and 7, the second case 23 has an arc shape and a U-shaped cross section. And the first
The side portion on the case 22 side is open, and the lower wall 23a is ½ or less in the axial direction with respect to the upper wall 23b. In the assembled state, the upper wall 23b of the second case 23 and the wall 23c at the end in the circumferential direction are inserted into the inside of the first case 22, and the upper wall 2
3b is in close contact with the upper wall 22b of the first case 22 to form an overlapping portion. In addition, the lower walls 22a and 23a of both cases
A predetermined gap 29 (see FIG. 2) is formed between them. The gap 29 is an opening that extends in the circumferential direction on the radially inner side of each arc-shaped fluid chamber 24.

Further, as shown in FIG. 3, the first case 2
Each fluid chamber 24 formed by the second and second cases 23
The same hydraulic oil as the hydraulic oil of the torque converter main body 2 is filled in the inside of, and a slider 25 is slidably inserted in the circumferential direction. As shown in FIG. 8, the slider 25 includes a box-shaped compartment 25a for partitioning the fluid chamber 24 into a compartment 24a on the R2 side and a compartment 24b on the R1 side, and a compartment 25a.
And an arc-shaped seal band 25b integrally formed on the inner peripheral side of the. A choke through which a fluid passes is formed between the partition portion 25a and the first and second cases 22 and 23 forming the fluid chamber 24. Recesses 25c extending in the circumferential direction are formed on the inner peripheral sides of both side surfaces of the box-shaped partition 25a. The lower walls 22a and 23 of both cases 22 and 23 are placed in the gap formed by the recess 25c and the seal band 25b.
a is inserted. That is, the seal band 25b is arranged outside the fluid chamber 24. Seal band 25
b is slidable between the lower walls 22a and 23a of the cases 22 and 23 and the side plates 20 and 21, and is a gap 29 formed between the lower walls 22a and 23a of the cases 22 and 23. The compartments 24a and 24b are sealed.
The box-shaped partition 25a has a cavity formed radially inward. The protrusion 12a of the driven plate 12 is inserted from the inside in the radial direction into the cavity. A gap of a predetermined angle is secured between the protrusion 12a and the circumferential side wall of the partition 25a. In this way, slider 2
5 is movable in the circumferential direction relative to the protrusion 12a only within a predetermined angle.

Cut and raised portions 20c and 21c are formed on the inner peripheral sides of the first sub plate 20 and the second sub plate 21, and a window hole 12b is formed on the outer peripheral portion of the driven plate 12. The torsion spring 30 is supported by. The torsion spring 30 constitutes the elastic coupling mechanism 13. Next, the operation will be described.

When the engine rotates, the front cover 4
The torque is input to. Impeller 5 is front cover 4
The hydraulic oil that rotates together with the impeller 5 causes the turbine 6 to rotate. The flow of hydraulic oil returning from the turbine 6 to the impeller 5 is adjusted by the stator 7. The rotation of the turbine 6 is transmitted to the input shaft (not shown) of the transmission via the turbine hub.

When the input shaft of the transmission reaches a predetermined number of revolutions, the hydraulic pressure in the hydraulic oil chamber in the torque converter 1 is increased and the hydraulic pressure between the front cover 4 and the piston 11 is released. As a result, the piston 11 is released. Are pressed against the front cover 4. Piston 1
When the friction member 15 of No. 1 is brought into pressure contact with the friction surface 4b of the front cover 4, the rotation of the front cover 4 is mechanically transmitted to the turbine hub 8 not via the torque converter body 2 but via the lockup device 3. That is, the front cover 4 → the side plates 20 and 21 → the elastic coupling mechanism 13 →
Power is transmitted through the path of the driven plate 12. Also, the outer peripheral projections 20b, 2 of the side plates 20, 21
1b is engaged with the notch 11b of the piston 11, and the side plates 20 and 21 and the torsional vibration damping device 14 are connected by the stud pin 28, so that the torque from the engine is damped by the torsional vibration. It is also transmitted to the device 14.

During the above lock-up operation, torque fluctuations on the engine side are transmitted to the lock-up device 3 as torsional vibrations. When transmitting this torsional vibration, the first and second
Relative rotation occurs between the side plates 20 and 21 and the driven plate 12, and the torsional vibration damping device 14 operates. Torsional vibration damping device with small displacement angle 1
4, the slider 25 moves in the circumferential direction relative to the driven plate 12 together with the fluid chamber 24.
At this time, since the slider 25 and the fluid chamber 24 rotate integrally, no fluid flows between the chokes. Therefore,
No large resistance force is generated, and the torsional vibration is absorbed by the torsion spring 30.

When a torsional vibration having a large displacement angle is input to the torsional vibration damping device 14, the slider 25 is projected by the projection 12
The slider 25 is engaged with a and moves relative to the fluid chamber 24 in the circumferential direction. At this time, the compartment 24a or 24b
Of the hydraulic fluid passes through a gap (choke) between the partition portion 25b and the cases 22 and 23 and is divided into the compartments 24a and 24b on the mating side.
Flow to. At this time, viscous resistance force is generated, and the torsional vibration is damped.

When the viscous resistance force described above is generated, the pressure of the hydraulic oil generated in the fluid chamber 24 acts on both side plates 20, 21 in the axial direction via the side walls of the cases 22, 23. . At this time, since both side plates 20 and 21 are fixed by the stud pin 28, expansion of both side plates 20 and 21 in the axial direction is prevented, and a change in the choke area in this direction can be prevented.

On the other hand, when the pressure of the hydraulic oil acts on the outer peripheral portion in the radial direction, the upper wall 23b of the second case 23 and the upper wall 22b of the first case 22 are brought into pressure contact with each other, and the sealing performance is enhanced. It is possible to prevent the leakage of the fluid. When the pressure of the hydraulic oil acts on the radially inner peripheral portion, each case 22,
The lower walls 22b and 23a of 23 are pressed against the seal band 31, and the sealing performance in this direction is also improved. Each case 22,
Since 23 is a separate member, each is easily deformed and the seal band 31 is easily pressed. As a result, the sealing property is further improved. When the sealing property is improved, the viscous resistance is further increased, and the torsional vibration having a large displacement angle is effectively damped.

Next, the advantages at the time of assembly will be described. Before attaching the driven plate 12 to the first side plate 20 and the first case 22, as shown in FIG. 8, a plurality of sliders 25 are fitted to the protrusions 12 a of the drib plate 12 from the outside in the radial direction. At this time, the partition 2
Since 5a and the seal band 25b are integrally formed, the assembling property is improved. Also, the seal band 25
Since b is not an integral structure in the circumferential direction but is divided in the circumferential direction, the assembling property is further improved.

[0028]

According to the torsional vibration damping device of the present invention,
When the displacement angle of the torsional vibration is small, there is no relative movement between the slide member and the arcuate fluid chamber, so viscous resistance is less likely to occur at the choke portion. Therefore, torsional vibration with a small displacement angle is difficult to be transmitted to the output side. When the displacement angle of the torsional vibration is large, the slide member engages with the protrusion of the rotating member and moves in the circumferential direction relative to the arc-shaped fluid chamber.
Due to the viscous resistance generated at this time, torsional vibration with a large displacement angle is damped.

When the slide member integrally has the seal portion, the assembling property is improved. When the slide member divides the fluid chamber into compartments and the seal portion seals the opening of the compartment portion, a large viscous resistance is generated.

[Brief description of drawings]

FIG. 1 is a partial vertical sectional view of a torque converter to which an embodiment of the present invention is applied.

FIG. 2 is a partially enlarged view thereof.

FIG. 3 is a front partial view of the lockup device.

FIG. 4 is a front view of a first case of the torsional vibration damping device used in the torque converter.

FIG. 5 is a VV sectional view thereof.

FIG. 6 is a front view of a second case of the torsional vibration damping device.

FIG. 7 is a VII-VII sectional view thereof.

FIG. 8 is a perspective partial view of a driven plate and a slider of the torsional vibration damping device.

[Explanation of symbols]

 1 Torque Converter 2 Torque Converter Main Body 3 Lockup Device 4 Front Cover 14 Torsional Vibration Damper 25 Slider 25a Partition 25b Seal Band

Claims (3)

[Claims] 1. A piston disposed between an input-side front cover of a torque converter and a torque converter main body, which is capable of press-contacting the front cover, and a piston and an output-side rotating body of the torque converter, which are arranged in a circumferential direction. A torsional vibration damping device for a torque converter lockup device, which includes an elastic coupling mechanism that elastically couples, and has an opening portion that is coupled to one of the piston and the output side rotating body and extends in a circumferential direction. An arc-shaped fluid chamber, a rotating member that is connected to the other of the piston and the output-side rotating body, and has a protrusion that is inserted into the fluid chamber from the opening, and is arranged in the fluid chamber so as to be relatively movable in the circumferential direction. And a cap-shaped slide member that engages with the protrusion so as to be relatively movable in the circumferential direction within a predetermined angle range; A torsional vibration damping device for a torque converter lockup device, comprising: a choke portion through which fluid in the fluid chamber passes due to relative movement of the body chamber. 2. The torsional vibration damping device for a torque converter lockup device according to claim 1, wherein the slide member integrally has a seal portion for sealing the opening. 3. The fluid chamber is a chamber divided in the circumferential direction by the slide member, the choke portion is formed between the slide member and the fluid chamber, and the seal portion is formed. Is a torsional vibration damping device for a torque converter lockup device according to claim 2, wherein the opening seals the compartment.