JPH05133439A - Liquid viscous damper mechanism - Google Patents

Abstract

PURPOSE:To generate a hysteresial torque conformed to an operating angle in spite of a twist angle as well as to improve the extent of reliability, in a viscous damper mechanism. CONSTITUTION:This liquid viscous damper mechanism is provided with a liquid chamber housing 18 which is housed with a liquid inside, rotating together with an input side member, and inserted with part of an output side member into the inner part. so is so provided with a slider 30, which is set up shiftably in a specified angle range in the housing 18, and formed into a box shape with an outer circumferential wall and a side wall coming into slide contact with an inner circumferential surface and a side wall of the housing 18, respectively, and a first choke part formed in space between this slider 30 and a part of the output side member. Furthermore, it is provided with a second choke part being formed in space between the liquid chamber housing and the output side member, and having a narrower clearance than that of the first choke member, and in this connection, a lubricating groove ranging from the outer circumferential wall to the side wall is formed on a surface of the slider.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a damper mechanism, especially
The present invention relates to a liquid viscous damper mechanism that is disposed between an input side member and an output side member and that uses the viscosity of a liquid to absorb the torsional vibration between the two members.

[0002]

2. Description of the Related Art A liquid viscous damper mechanism is known as a damper mechanism used in, for example, an automobile engine. This liquid viscous damper mechanism is generally for absorbing the torsional vibration from the engine side by viscous force of the liquid, and the drive plate connected to the engine side crankshaft and the drive side drive shaft are connected to each other. It is composed of a driven plate connected via a clutch and a liquid viscous damper mechanism arranged between the plates and having a liquid chamber.

An example of a conventional liquid viscosity damper mechanism is shown in FIG.
Shown in. In the figure, a ring-shaped drive plate 60
Has a projection 66 protruding inward in the radial direction at a part thereof. On the other hand, the driven plate 64 has a notch 65 in a part of its outer periphery, and the protrusion 66 is fitted in the notch 65. A gap is formed between the tip (lower end) of the protrusion 66 and the notch 65 to form a choke 63.
On both sides of the choke 63, liquid compartments 61 and 62 into which the liquid is injected are formed.

When the hysteresis torque is changed in two steps, for example, a step 67 is formed in the cutout 65. Here, when the drive plate 60 is twisted with respect to the driven plate 64 by an angle θ3 in the rotation direction R side from the state of FIG. 9 or an angle θ4 in the opposite direction, the gap of the choke 63 changes from D1 to D2. Therefore, as shown in FIG. 10, the hysteresis torque changes from H3 to H4.
Increase to.

[0005]

SUMMARY OF THE INVENTION In the above conventional configuration,
The hysteresis torque changes depending only on the change in the twist angle of the drive plate 60 with respect to the driven plate 64. Therefore, a small hysteresis torque cannot be generated in a large twist angle range depending on the situation, and a large hysteresis torque cannot be generated in a small twist angle range depending on the situation.

An object of the present invention is, in a liquid viscous damper, to exert a small viscous force at a small operating angle, a large viscous force at a large operating angle, and a liquid regardless of the torsion angle. It is to improve the reliability of the viscous damper.

[0007]

A liquid viscous damper mechanism according to the present invention is arranged between an input side member and an output side member and absorbs torsional vibration between both members by utilizing the viscosity of the liquid. It is a mechanism to do. This mechanism includes a liquid chamber housing, a slider, a first choke portion and a second choke portion.

The liquid chamber housing contains liquid therein, rotates with the input side member, and has a part of the output side member inserted therein. The slider is arranged so as to be movable within a predetermined angle range in the liquid chamber housing,
Each of the liquid chamber housings has an outer peripheral wall and a side wall that are in sliding contact with the inner peripheral wall and the side wall of the liquid chamber housing, and is formed in a box shape. The first choke portion is formed by a slider and a part of the output side member. The second choke portion is formed by the liquid chamber housing and the output side member, and has a narrower gap than the first choke portion. In addition, a lubricating groove is formed on the surface of the slider from the outer peripheral wall to the side wall.

[0009]

In the liquid viscous damper mechanism according to the present invention, regardless of the twisting angle of the input side member with respect to the output side member, hysteresis is caused by the positional relationship between the slider and a part of the output side member inserted into the liquid chamber housing. The torque changes. That is, here, for a small operating angle such as combustion fluctuation, a small viscous force acts by the first choke portion to reduce the hysteresis torque, and for a large operating angle such as when the vehicle body vibrates, a second operating angle is set. A large viscous force is exerted by the choke portion to increase the hysteresis torque. Therefore, effective vibration absorption can be performed against different fluctuations such as combustion fluctuations and vehicle body vibrations.

Further, since a lubricating groove is formed on the surface of the slider from the outer peripheral wall to the side wall, the liquid moved to the outer peripheral side of the liquid chamber housing by the centrifugal force moves from the outer peripheral wall surface of the slider to the side wall surface. Therefore, the liquid is supplied between the slider and the liquid chamber housing, the lubricity is improved, and the durability of the slider is improved. As a result, the reliability of the liquid viscosity damper mechanism is improved.

[0011]

1 shows a flywheel assembly employing a liquid viscous damper mechanism as an embodiment of the present invention. This flywheel assembly includes a first flywheel 1, a second flywheel 3 rotatably supported by a bearing 2 on the first flywheel 1, a first flywheel 1 and a second flywheel 3. And a liquid viscous damper mechanism 4 (hereinafter, simply referred to as a damper mechanism 4) disposed between the two. The first flywheel 1 is designed to be fixed to the shaft end of the engine crankshaft,
A clutch 5 is attached to the second flywheel 3.

The first flywheel 1 is a generally disk-shaped member and has a recess for accommodating the damper mechanism 4. The central portion has a boss portion 1a, and the bearing 2 is mounted on the outer periphery of the boss portion 1a. The bearing 2 is the boss portion 1.
It is fixed by a plate 7 fixed to the end face a by a rivet 6. The boss portion 1a is formed with a hole 1b through which a bolt for fixing the flywheel assembly to the crankshaft penetrates. Further, a stopper plate 8 and a sub plate 9 for mounting the damper mechanism 4 in the first flywheel 1 are arranged on the end surface of the first flywheel 1 on the side of the second flywheel 3, and these plates 8 , 9 are fixed to the outer periphery of the first flywheel 1 by rivets 10.

The second flywheel 3 is a substantially disk-shaped member, and has a boss portion 3a at the center thereof. Boss 3
The reference character a projects toward the first flywheel 1 side, and the bearing 2 is mounted on the inner peripheral portion thereof. The bearing 2 is a lubricant sealed type, and a heat insulating member 11 for blocking heat from the clutch 5 side is arranged between the bearing 2 and the boss portion 3a. The heat insulating member 11 contacts only the outer race of the bearing 2 and does not contact the inner race. As shown in FIG. 2, corrugated external teeth 12 to which the output portion of the damper mechanism 4 is connected are formed on the outer peripheral portion of the boss portion 3a at the tip end on the first flywheel 1 side. In addition, the boss portion 3a is provided at the base of the boss portion 3a.
And the damper mechanism 4 between the stopper plate 8 and the inner peripheral portion of the stopper plate 8.
A seal member 13 for sealing the liquid inside is arranged. Further, the clutch-side end surface of the second flywheel 3 has a friction surface 3 against which the friction member of the clutch disc is pressed.
It is b.

Next, the damper mechanism 4 will be described. The damper mechanism 4 mainly includes a pair of drive plates 14 arranged to face each other, a pair of driven plates 15 arranged in the pair of drive plates 14, both plates 14,
A torsion spring 16 for elastically connecting 15 and
The liquid chamber housing 18 is provided.

The drive plate 14 is a ring-shaped member, and as shown in FIG. 2, has drive portions 19 which project radially inward at predetermined angular intervals. A space for accommodating the torsion spring 16 is provided between the adjacent protrusions 19. A plurality of holes 20 are formed in the drive plate 14. In the hole 20, the fixing pin 2
1 is inserted, and as shown in FIG. 1, the pair of drive plates 14, the stopper plate 8, and the dam portion (described later) of the liquid chamber housing 18 arranged in the pair of drive plates 14 are fixed. It has become so.

The driven plate 15 is a ring-shaped member and has corrugated internal teeth 22 at its inner peripheral end, as shown in FIG. The corrugated internal teeth 22 are used for the second flywheel 3
Meshes with the corrugated outer teeth 12 formed on the second flywheel 3 so that the driven plate 15 can rotate integrally with the second flywheel 3. In addition, the driven plate 15 has
A plurality of window holes 23 are formed at intervals in the rotation direction. The window hole 23 corresponds to the space between the adjacent projecting portions 19 of the drive plate 14, and the torsion spring 16 is housed in the space formed by these. As shown in FIG. 2, the torsion spring 16 is in contact with both circumferential end surfaces of the window hole 23 via the spring seat 24. However, in the damper mechanism free state, as shown in FIG. 2, only the inner peripheral end portions of the torsion spring 16 are in contact with both end surfaces of the window hole 23. That is, the torsion spring 16 is accommodated in the window hole 23 in a biased state.

A plurality of protrusions 27 are formed on the outer peripheral portion of the driven plate 15 so as to protrude outward in the radial direction, corresponding to the portions where the window holes 23 are not formed.
An annular liquid chamber housing 18 sandwiched by a pair of drive plates 14 is arranged on the radially outer side of the driven plate 15. Liquid chamber housing 18
Has a plurality of weir portions 25 at intervals in the circumferential direction, as shown in FIG. A hole 25a is formed in the weir 25, and the fixing pin 21 is inserted into the hole 25a.

As shown in FIG. 3, the liquid chamber housing 18 can be divided into two parts in the left-right direction (axial direction) and five parts in the circumferential direction. That is, the liquid chamber housing 1
8 is composed of a total of 10 arc-shaped housing members 18a. Dam portions 2 for forming dam portions 25 are formed at both ends of each housing member 18a in the circumferential direction.
5c is formed. The liquid chamber housing 18 is assembled in an annular shape and is connected to the drive plate 14 by superposing the corresponding dam portions 25c of the pair of adjacent housing members 18a and connecting them by the fixing pins 21.

A pair of annular projections 26 (FIG. 3) are formed on the radially inner end of the liquid chamber housing 18, and the annular projections 26 are fitted in the annular groove 15a formed in the driven plate 15. By doing so, the liquid chamber is sealed. As shown in FIG. 4, the slider 30 is formed in a box shape having an opening on the inner side, and has a protrusion 27 of the driven plate 15.
Are arranged in the liquid chamber housing 18 so as to be housed therein. The slider 30 is made of resin, and the outer peripheral wall 32 on the outer side in the radial direction is formed in an arc shape along the inner peripheral side wall surface of the liquid chamber housing 18. A pair of leg portions 31 is formed on each of radially inner portions of both ends of the slider 30 in the circumferential direction, and the liquid circulation opening 3 is provided between the leg portions 31.
It is 2. The leg portion 31 slidably contacts the outer peripheral edge of the driven plate 15. As shown in FIG.
The outer peripheral wall 32 of the slider 30 and both side walls 33 extending in the circumferential direction slidably contact the inner wall of the liquid chamber housing 18. A liquid pool 34 is formed on the surface of the outer peripheral wall 32 of the slider 30. A groove 35 extending in the circumferential direction is formed on both side walls 33. The liquid pool 34 and the groove 35 are connected by a communication groove 36.

Further, both side walls in the circumferential direction of the slider 30 are stopper portions 37, and the stopper portions 37 are provided.
Is an angle θ with respect to the protrusion 27 when the engine is stopped.
They are spaced by 1 and θ2 in the circumferential direction (see FIG. 2). The protrusion 27 connects the liquid chamber in the slider 30 to the first sub-compartment 38 at the front in the rotational direction and the second sub-compartment 3 at the rear in the rotational direction.
A sub-choke S1 is formed between the inner wall of the slider 30 and the inner wall of the slider 30 to connect the two compartments 38 and 39.

Between the radially inner peripheral edge of the weir 25 and the outer edge of the driven plate 15, the adjacent compartments 40,
A main choke S2 communicating with 41 is formed. The interval between the main chokes S2 is smaller than the interval between the sub chokes S1. That is, the flow cross-sectional area of the sub-choke S1 is larger than the flow cross-sectional area of the main choke S2. Liquid replenishing notches 42 are formed on both axial sides of the liquid chamber housing 18. The liquid replenishment notch 42 is formed substantially at the center in the circumferential direction between the adjacent main chokes S2,
The inner portion of the liquid chamber housing 18 in the radial direction has a shape that opens toward the axis.

Next, the operation of the above embodiment will be described. When a torsional torque is generated during operation, the drive plate 14 is twisted forward or backward in the rotational direction with respect to the driven plate 15. At this time, in the range of the small torsion angle, the torsion spring 16 is biased and compressed, so that the liquid viscous damper mechanism exhibits a small torsional rigidity. When the torsion angle becomes large, the torsion spring 16 is totally compressed, so that the damper mechanism exhibits a large torsional rigidity.

The generation of hysteresis due to the movement of the liquid when the torsion torque is generated will be described. It is assumed that the drive plate 14 is twisted, for example, in the rotation direction R side with respect to the driven plate 15 in a state where the protrusion 27 is not in contact with the stopper portion 37 of the slider 30 as shown in FIG. In this case, the slider 30 also moves in the rotation direction R side. As a result, the second sub-compartment 3
At the same time that 9 is compressed and becomes smaller, the first sub-compartment 38 is expanded and becomes larger. As a result, the liquid mainly flows from the second sub-compartment 39 to the first sub-compartment 38 through the sub-choke S1. Here, since the cross-sectional area of the flow path of the liquid flowing from the second sub-compartment 39 to the first sub-compartment 38 is large, the flow path resistance is small. Therefore, a small hysteresis torque H1 (FIG. 8) is generated here.

When the slider 30 moves as described above, the outer peripheral wall 32 and both side walls 33 of the slider 30 slide on the inner wall of the liquid chamber housing 18. At this time, the liquid in the liquid pool 34 is supplied to the groove 35, and the lubricity between the side walls 33 and the inner wall of the liquid chamber housing 18 is improved. As a result, problems such as the slider 30 being welded to the inner wall and the slider 30 being worn are less likely to occur, and the durability of the damper mechanism 4 is improved. Further, in the liquid chamber housing 18, since the liquid is moved to the outer peripheral side in the radial direction by the centrifugal force, the liquid is constantly supplied to the liquid pool 34.

When the twist angle increases and the stopper portion 37 on the rear side in the rotation direction comes into contact with the protrusion 27, the slider choke S1 keeps the slider opening 32 closed and the slider 30 is fixed by the protrusion 27. It will be in the state of being. Therefore, the drive plate 14 moves forward in the rotation direction R with respect to the driven plate 15 and the slider 30. As a result, the liquid in the second large compartment 41
The first large chamber 40 at the rear in the direction of rotation through the main choke S2
Flow through the outer peripheral side surface of the slider 30 and the first flywheel 1, etc.
It flows to 0. Here, since the flow path cross-sectional area of the main choke S2 is small, a high fluid resistance is generated and a large hysteresis torque H2 (FIG. 8) is generated.

During the above-mentioned operation, the liquid in the liquid chamber housing 18 slightly leaks from the seal portion of the annular projection 26. However, here, the liquid can be replenished to the liquid chamber through the liquid replenishment notch 42 by the centrifugal force, so that the generation of the hysteresis torque due to the decrease of the liquid in the liquid chamber housing 18 is prevented. When the drive plate 3 is twisted forward as described above and then returned to the initial state, first, the slider 41 is moved from the protrusion 41.
The rear stopper part 37 of 0 is separated, and the sub choke S1
Works. Here, in the section of the twist angle θ1 + θ2, the liquid mainly flows through the sub-choke S1 from the first large branch chamber 40 to the second large branch chamber 41, so that a small hysteresis torque H1 is generated.

Further, it is assumed that a small fluctuation occurs due to combustion fluctuation, for example, in a state where the drive plate 14 is twisted at a constant angle with respect to the driven plate 15. At this time,
The slider 30 vibrates within the range of the twist angle θ1 + θ2, and the sub-choke S1 functions to generate a small hysteresis torque H1. That is, the point of time when the hysteresis torque changes is determined not by the absolute twist angle of the drive plate 14 with respect to the driven plate 15, but by the positional relationship between the slider 30 and the protrusion 27. [Other Embodiments] In the above embodiments, the groove 35 formed on the surface of the slider 30 is formed in a straight line, and the liquid pool 34 is formed in an elliptical shape, but these may have other shapes. For example, as shown in FIG. 6, a corrugated groove 51 may be provided. Further, as shown in FIG. 7, a liquid pool 52 in which a plurality of grooves intersect each other may be provided in one groove.

[0028]

As described above, according to the present invention, the hysteresis torque changes depending on the positional relationship between the slider and the protrusion regardless of the twist angle. That is, here, a small viscous force acts on a small operating angle such as combustion fluctuations to reduce the hysteresis torque, and a large viscous force acts on a large operating angle such as when the vehicle body vibrates to generate a hysteresis torque. The torque increases. Therefore, effective vibration absorption can be performed against different fluctuations such as combustion fluctuations and vehicle body vibrations.

Further, since the liquid groove is formed on the surface of the slider from the outer peripheral side wall to the side wall, the liquid moved to the outer peripheral side of the liquid chamber by the centrifugal force moves from the outer peripheral wall of the slider to the side wall surface. Therefore, the liquid is supplied between the slider and the liquid chamber, the lubricity is improved, and the durability of the slider is improved. As a result, the reliability of the liquid viscosity damper mechanism is improved.

[Brief description of drawings]

FIG. 1 is a sectional view of a liquid viscous damper mechanism as an embodiment of the present invention.

FIG. 2 is a partial sectional view taken along the line II-II of FIG.

FIG. 3 is an exploded perspective view of a liquid chamber housing.

FIG. 4 is a perspective view of a slider.

5 is a partially enlarged view of FIG.

FIG. 6 is a front view of a slider according to another embodiment.

FIG. 7 is a top view of a slider according to still another embodiment.

FIG. 8 is a diagram showing a twisting characteristic of the embodiment.

FIG. 9 is a diagram corresponding to FIG. 2 of a conventional example.

FIG. 10 is a diagram showing a twisting characteristic of the conventional example of FIG.

[Explanation of symbols]

 14 Drive plate 25 Dam portion 31 Stopper 18 Liquid chamber housing 27 Protrusion 30 Slider 32 Outer peripheral wall 33 Side wall 34,52 Liquid pool 35,51 Groove 36 Communication groove

Claims (1)

[Claims] 1. A liquid viscous damper mechanism which is disposed between an input side member and an output side member and absorbs the torsional vibration between the two members by utilizing the viscosity of the liquid. A liquid chamber housing that rotates together with the input side member and has a part of the output side member inserted therein; and a liquid chamber housing movably arranged within the liquid chamber housing within a predetermined angular range. A box-shaped slider having an outer peripheral wall and a side wall slidably contacting an inner peripheral wall and a side wall of the first chamber, a first choke portion formed by the slider and a part of the output side member, the liquid chamber housing and the output side member And a second choke portion having a narrower gap than the first choke portion, and a lubricating groove is formed on the surface of the slider from the outer peripheral wall to the side wall. Liquid viscous damper mechanism.