JPH11257431A - Torque transmission device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a torque transmission device to prevent leakage of fluid through the slide contact part of a seal member as much as possible by blocking reach of fluid in a sealed space to the slide contact part of the seal member. SOLUTION: A first inertial body 2 coupled to a drive shaft 1 and a second inertia body 3 relatively rotatably supported at the first inertia body 2 are interlinked through a damper 4. A closed space 42 is formed between the first and second inertia bodies 2 and 3 and the twist damper 4 is arranged in the closed space 42 and sealed with fluid. A seal member 41 having the inner peripheral side fixed at the inertia body 3 and the outer peripheral side brought into slide contact with the first inertia body 2 is arranged in the closed space 42. A protrusion 43 positioned radially externally of the seal member 41 and protruded toward the internal part of the closed space 42 is formed on the first inertia body 2 with which the outer peripheral side of the seal member 41 makes slide contact.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a torque transmission device provided for an internal combustion engine, and more particularly to a torque transmission device having two inertia bodies, which are connected via a torsional damper. The present invention relates to a torque transmission device.

[0002]

2. Description of the Related Art For example, Japanese Patent Application Laid-Open No. Sho 63-254248 discloses a torque transmitting device of this type which includes a first inertial body connected to a drive shaft and a rotatable support relative to the first inertial body. A torque transmission device in which a closed space is formed between the first inertia body and the second inertia body, wherein the closed space is formed between the first inertia body and the second inertia body. A torque transmission device in which a torsional damper is arranged in a space and a fluid is sealed is shown.

In the closed space of the torque transmission device, there is provided an annular seal member whose inner peripheral side is fixed to the second inertial body and whose outer peripheral side is in sliding contact with the first inertial body. The fluid inside is sealed.

That is, since the first inertial body and the second inertial body of the torque transmitting device relatively rotate within the elastic range of the torsional damper, a portion that slides on the first inertial body on the outer peripheral side of the seal member. Performs a sealing action to seal off the fluid in the closed space.

[0005]

By the way, when the first inertial body and the second inertial body are rotating, the fluid in the closed space is located at the outermost peripheral side of the closed space due to centrifugal force, and the fluid in the sealed space is sealed. Although the outer peripheral side of the member does not reach the portion in sliding contact with the inertial body, when the rotation of the first inertial body and the second inertial body stops, a part of the fluid having a large potential energy starts to move in the closed space due to gravity. During this movement, the sliding member reaches the sliding contact portion of the seal member.

The fluid that has reached the sliding contact portion of the seal member is sealed by the sealing action of the sliding contact portion. However, when the sliding contact portion is worn and the sealing performance is degraded, for example. The fluid may leak.

The present invention has been devised in view of the above-mentioned conventional circumstances, and prevents the fluid in the sealed space from reaching the sliding contact portion of the seal member, thereby preventing the fluid from flowing from the sliding contact portion of the seal member. An object of the present invention is to provide a torque transmission device capable of preventing leakage as much as possible.

[0008]

SUMMARY OF THE INVENTION In view of the above, the first aspect of the present invention provides a first inertial body connected to a drive shaft and a second inertial body supported to be rotatable relative to the first inertial body. Between the first inertial body and the second inertial body, wherein the closed space is formed between the first inertial body and the second inertial body. In a torque transmission device in which a damper is arranged and a fluid is sealed, an inner peripheral side is fixed to one of a first inertia body and a second inertia body in the closed space, and an outer peripheral side is fixed to one of the inertia bodies. A substantially annular seal member is provided for sliding contact with the other inertial body, and an outer peripheral side of the seal member is positioned radially outward of the seal member with respect to the first inertial body or the second inertial body which is in sliding contact with the other inertial body. Formed with an annular projection protruding toward the inside of the It is the adult.

According to a second aspect of the present invention, in the configuration of the first aspect, the outer periphery of the projection is inclined such that the outer diameter of the projection increases toward the inside of the closed space. It has a configuration that does.

According to a third aspect of the present invention, in the configuration of the first aspect, the inner circumference of the projection is such that the inner diameter of the projection increases toward the inside of the closed space. It is configured to be inclined.

Here, the projection is formed integrally with or separate from the first inertial body or the second inertial body with which the outer peripheral side of the seal member slides. Further, a viscous fluid such as grease is selected as the fluid sealed in the closed space.

In such a configuration, the torque applied to the drive shaft is input to a first inertia body connected to the drive shaft, and the second inertia body is connected to the second inertia body via a torsional damper.
It is transmitted to the inertial body. At this time, while the torsional damper arranged in the closed space exerts a vibration absorbing action, the fluid in the closed space can lubricate each component of the torsional damper, and this fluid is sealed by a seal member. Is done.

Since the first inertial body and the second inertial body are relatively rotated within the elastic range of the torsional damper, the first inertial body or the second inertial body on the outer peripheral side of the seal member is sealed by the seal member. The portion (sliding contact portion) that comes into sliding contact with the two inertial bodies performs a sealing action, and seals the fluid in the closed space.

More specifically, the fluid in the closed space is the first fluid.
In a state where the inertial body and the second inertial body are rotating, the outer peripheral side of the sealing member is located at the outermost peripheral side in the closed space due to centrifugal force and does not reach a portion where the outer peripheral side of the seal member is in sliding contact with the inertial body,
When the rotation of the first inertial body and the second inertial body stops, a part of the fluid having a large potential energy starts to move in the closed space due to gravity, and reaches the sliding contact portion of the seal member during this movement. In this case, the sliding contact portion is sealed by the sealing action.

Here, in the present invention, the fluid in the closed space is effectively prevented from reaching the sliding portion of the seal member.

That is, when the rotation of the first inertial body and the second inertial body is stopped, the fluid on the outermost peripheral side of the closed space starts to move by gravity, and approaches the sliding portion of the seal member. The fluid comes into contact with a projection formed radially outwardly of the sealing member and is captured by the projection. The fluid trapped by the protrusion flows along the outer periphery of the protrusion and flows down to a position having the lowest potential energy.

Therefore, when the rotation of the first inertial body and the second inertial body is stopped and the fluid moves in the closed space, this fluid is effectively prevented from reaching the sliding portion of the seal member. .

Therefore, the fluid in the closed space is prevented from reaching the sliding contact portion of the seal member, and the torque transmission can prevent the leakage of the fluid from the sliding contact portion of the seal member as much as possible. A device is obtained.

According to the second aspect of the present invention, the outer periphery of the projection is inclined such that the outer peripheral diameter of the projection increases toward the inside of the closed space. Are groove-shaped, and the capture and flow of the fluid are smooth.

According to the third aspect of the present invention, the inner periphery of the projection is inclined such that the inner peripheral diameter of the projection increases toward the inside of the closed space. When the fluid flows into the inner peripheral side of the projection beyond the above, this fluid can quickly flow down along the inclined surface on the inner peripheral side of the projection without staying on the inner peripheral side of the projection Becomes

[0021]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a sectional view of a torque transmission device showing an embodiment of the present invention, and is a sectional view taken along line AOA of FIG. 2, and FIG. 2 is a sectional view of the torque transmission device shown in FIG. FIG. 3 is a partially enlarged plan view showing the main part of FIG. 1.

In FIG. 1, reference numeral 1 denotes a drive shaft, that is, a crankshaft of an internal combustion engine, and 2 denotes a first inertial body.
Are connected to the drive shaft 1 by bolts not shown. 3
Is a second inertia body rotatably supported by the first inertia body 2, and the second inertia body 3 can be connected to a clutch device (not shown). Reference numeral 4 denotes a torsional damper that connects the first inertial body 2 and the second inertial body 3 to each other.

The first inertial body 2 has a recess 8 formed on the side facing the second inertial body 3, thereby forming an inner peripheral rib 9 and an outer peripheral rib 10. An annular inertia body 12 is integrally attached to the outer peripheral rib 10 on the second inertia body 3 side by a pin 11. The annular inertial body 12 forms a part of the first inertial body 2 by being attached to the first inertial body 2, and has a recess 8.
Cover a part of the outer peripheral side. The first inertial body 2
A ring gear 13 is fixed to the outer peripheral side of this by shrink fitting.

The second inertial body 3 is formed in a substantially annular plate shape, and its inner peripheral side is supported by a bearing 17 attached to the outer periphery of the inner peripheral side rib 9 of the first inertial body 2, It is pivotable with respect to the body 2.

The second inertial body 3 has a clutch sliding surface 1 with which a clutch disk of a clutch device (not shown) contacts.
8 are formed.

The torsion damper 4 connecting the first inertial body 2 and the second inertial body 3 is provided facing the depression 8 of the first inertial body 2, and includes a damper hub 26 and a damper hub 26. 26, a pair of drive plates 27 disposed on both sides of the drive plate 26, the damper hub 26 and the drive plate 27.
Windows 28, 2 formed at positions corresponding to
9, the damper hub 26 and the drive plate 2
And a compression spring 30 which elastically connects the first spring 7 and the second spring 7 so as to be relatively rotatable.

The damper hub 26 is formed of an annular plate member, has a plurality of windows 28 formed therein, and has inner teeth 32 for accommodating a block-shaped friction material 31 on the inner peripheral side, and has outer teeth on the outer peripheral side. A plurality of projections 33 extending radially outward are formed.

The damper hub 26 is resilient to the first inertia body 2 via an arc-shaped coil spring 35 provided between a spring receiver 34 attached to the first inertia body 2 and the projection 33. It is mounted so as to be relatively rotatable.

Windows 29 are formed in the pair of drive plates 27 in correspondence with the windows 28 formed in the damper hub 26. The drive plates 27 are integrated with each other via rivet pins 36. In addition, the rivet pin 36 is fixed to the second inertial body 3 to be integrally connected to the second inertial body 3. The rivet pin 36 can be engaged with the window 28 formed in the damper hub 26 with a predetermined play angle in the torsional direction of the torsional damper 4.

The plurality of windows 27 formed in the drive plate 27 have different window widths (dimensions in the circumferential direction) with respect to the windows 28 of the damper hub 26 so that the torsion damper 4 can be used. The multi-stage torsional characteristic is given to the torsional characteristic of the above.

The compression springs 30 are accommodated one by one in corresponding windows 28, 29, as best shown in FIG. Further, the compression spring 30 is provided in the window 2 having a small window width.
8, both ends are accommodated in a state where they do not contact the window 29 of the drive plate 27, that is, with a predetermined play angle.

In the torsion damper 4, the damper hub 26 is connected to the first inertia body via the coil spring 35 and the drive plate 27 is connected to the second inertia body 3.
The first inertial body 2 and the second inertial body 3 are connected so as to be elastically relatively rotatable. When the first inertial body 2 and the second inertial body 3 rotate relative to each other, the coil spring 35 and the compression spring 30 of the torsion damper 4 act in series.

Reference numeral 41 denotes a substantially annular seal member. The inner peripheral side of the seal member 41 is fixed to the second inertial body 3 in this embodiment, and the outer peripheral side is in sliding contact with the first inertial body 2. More specifically, the inner peripheral side of the seal member 41 is sandwiched between the second inertial body 3 and the drive plate 27, and the outer peripheral side is in contact with the annular inertial body 12 attached to the first inertial body 2.

The inside of the depression 8 is sealed by the seal member 41, whereby a sealed space 42 is formed between the first inertial body 2 and the second inertial body 3.

The closed space 42 is filled with a predetermined fluid, for example, grease, in a predetermined amount that does not fill the closed space 42. The closed space 42
Inside, the torsional damper 4 is housed and arranged.

The first inertial body 2, that is, the annular inertial body 12 with which the outer peripheral side of the seal member 41 is in sliding contact, is provided with the seal member 41.
An annular projection 43 protruding toward the inside of the closed space 42 is formed at a position radially outward of the outside.

The outer periphery and the inner periphery of the projection 43 are first.
The inertial body 2 is formed in a shape slightly inclined with respect to the rotation axis. That is, the outer periphery of the projection 43 is
Is inclined so that the outer diameter of the outer diameter of the outer diameter increases toward the inside of the closed space 42. The inner circumference of the projection 43 is inclined such that the inner diameter of the projection 43 increases toward the inside of the closed space 42 (see FIG. 3).

Reference numerals 44 and 45 denote retainers disposed on both sides of the friction material 31, respectively. The retainers 44 and 45 are engaged with the pair of drive plates 27 while being in contact with the friction material 31. While the retainer 44 is engaged with the drive plate 27 at a predetermined play angle, a bent tongue 46 is formed, and the bent tongue 46 is fitted into an engagement hole 47 formed in the first inertial body 2. Is engaged.

A disc spring 48 is disposed between the retainer 44 and the first inertial body 2, and presses the friction material 31 toward the second inertial body 3 via the retainer 44. by this,
The friction material 31 can exhibit a friction damping ability when a relative rotation occurs between the first inertial body 2 and the second inertial body 3.

In such a configuration, the torque applied to the drive shaft 1 is input to the first inertial body 2 connected to the drive shaft 1, and from the first inertial body 2 via the torsion damper 4. The power is transmitted to the second inertial body 3. Specifically, since the damper hub 26 of the torsion damper 4 is connected to the first inertia body 2 via the coil spring 35 and the drive plate 27 is connected to the second inertia body 3 via the rivet pin 36, The torque input to the first inertia body 2 is
5, transmitted to the second inertia body 3 via the damper hub 26 of the torsion damper 4, the compression spring 30, and the drive plate 27.

At this time, the coil spring 35 and the torsion damper 4 arranged in the closed space 42 exhibit a vibration absorbing function, while the friction material 31 exhibits a friction damping ability. Also,
The fluid in the closed space 42 can lubricate each component of the torsional damper 4, and this fluid is sealed by the seal member 41.

When the coil spring 35 and the torsion damper 4 exhibit a vibration absorbing action, the coil spring 35 is
9 acts in series with the compression spring 30 housed in the housing 9, has a small spring constant, performs a vibration absorbing action with a long deflection amplitude, and has a compression spring housed in the windows 28 and 29.
0 acts in parallel to obtain proper torsional elasticity. In addition, the friction material 31 frictionally slides between the retainers 44 and 45 to exhibit a damping action.

Since the first inertial body 2 and the second inertial body 3 are relatively rotated within the elastic range of the torsional damper 4, the sealing by the seal member 41 is performed.
The portion (sliding contact portion) that comes into sliding contact with the inertial body 2 (the annular inertial body 12) performs a sealing action, and seals the fluid in the closed space 42.

More specifically, the fluid in the closed space 42 is
In a state where the first inertial body 2 and the second inertial body 3 are rotating, the outer peripheral side of the sealing member 41 is located on the outermost peripheral side in the closed space 42 due to the centrifugal force, and the first inertial body 2 (the annular inertial body 12) is located on the outer peripheral side. When the rotation of the first inertial body 2 and the second inertial body 3 is stopped, although the portion does not reach the portion in sliding contact with the fluid, a part of the fluid having a large potential energy starts to move in the closed space 42 due to gravity. During the movement, the sealing member 41
Is reached by the sealing action of the sliding contact portion.

Here, in the present invention, the fluid in the closed space 42 is effectively prevented from reaching the sliding portion of the seal member 41.

That is, the first inertial body 2 and the second inertial body 3
Is stopped, and the fluid on the outermost peripheral side of the sealed space 42 starts to move by gravity, and approaches the sliding contact portion of the seal member 41, the fluid moves radially outward from the seal member 41. In contact with the projection 43 formed at the position,
The projection 43 captures the light. The fluid captured by the protrusion 43 flows along the outer periphery of the protrusion 43 and flows down to a position having the lowest potential energy.

For this reason, when the rotation of the first inertial body 2 and the second inertial body 3 is stopped and the fluid moves in the closed space 42, it is effective that the fluid reaches the sliding contact portion of the seal member 41. Is blocked.

Therefore, it is possible to prevent the fluid in the closed space 42 from reaching the sliding contact portion of the seal member 41 and to prevent the leakage of the fluid from the sliding contact portion of the seal member 41 as much as possible. A torque transmission device can be obtained.

The outer periphery of the projection 43 is
Since the outer diameter of the outer periphery 3 is inclined so as to increase toward the inside of the closed space 42, the outer periphery of the projection 43 becomes a groove, and the capture and flow of the fluid are smooth.

The inner periphery of the projection 43 is
3 is inclined so that the diameter of the inner circumference increases toward the inside of the closed space 42, so that when the fluid flows into the inner circumference of the projection 43 beyond the projection 43, It is possible to quickly flow down along the inclined surface on the inner peripheral side of the projection 43 without staying on the inner peripheral side of the projection 43.

Although the embodiment has been described with reference to the drawings, the specific configuration is not limited to this embodiment and can be changed without departing from the spirit of the invention.
For example, although the embodiment in which the drive plate 27 of the torsion damper 4 is disposed on both sides of the damper hub 26 has been described, a configuration in which the drive plate 27 is disposed on only one side may be employed.

[0053]

As described above, according to the present invention, the fluid in the sealed space is prevented from reaching the sliding contact portion of the seal member, and the fluid from the sliding contact portion of the seal member is prevented. A torque transmission device capable of preventing leakage as much as possible is obtained.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a torque transmission device according to an embodiment of the present invention, taken along line AOA of FIG.

FIG. 2 is a partial plan view in which a part of the torque transmission device shown in FIG. 1 is cut away.

FIG. 3 is an enlarged view showing a main part of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Drive shaft 2 1st inertia body 3 2nd inertia body 4 Torsion damper 41 Seal member 42 Sealed space 43 Projection

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI F16F 15/139 F16F 15/139 B (72) Inventor Daisuke Shibata 1370 Onna, Atsugi-shi, Kanagawa Pref. Inventor Masato Ichinose 1370 Onna, Atsugi-shi, Kanagawa Pref.

Claims (3)

[Claims] 1. A first inertial body connected to a drive shaft and a second inertial body supported to be rotatable relative to the first inertial body are connected to each other via a torsion damper. A torque transmission device comprising: a sealed space formed between the first inertial body and the second inertial body; a torsional damper disposed in the sealed space; and a fluid sealed therein. In the device, a substantially annular seal member is provided in the closed space, the inner peripheral side of which is fixed to one of the first inertial body and the second inertial body, and the outer peripheral side of which is in sliding contact with the other inertial body. In addition, the first outer peripheral side of the seal member is in sliding contact.
A torque transmission device comprising: an inertial body or a second inertial body formed with a ring-shaped projection located radially outward of a seal member and protruding toward the inside of a sealed space. 2. The torque transmission device according to claim 1, wherein the outer circumference of the projection is inclined such that the outer diameter of the projection increases toward the inside of the closed space. 3. The torque transmission device according to claim 1, wherein the inner circumference of the projection is inclined such that the inner diameter of the projection increases toward the inside of the closed space. .