JP2000179560A - Bearing for flywheel damper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent an excessive increase in internal pressure as the temperature of an engine side mass rises, and to prevent leakage of grease as the internal pressure is released. SOLUTION: This bearing is applied to a bearing 6 to mutually support an engine side mass 2 and a transmission side mass 3 of a flywheel damper 1. The bearing 6 has a contact seal 15 on both sides, and each contact seal 15 has a plurality of lip parts 15c, 15d. A slit 18 for releasing air is provided in the inner-most lip part 15c of the contact seal 15 located on the side opposite to the engine side mass 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing for supporting a flywheel damper of an automobile engine, and a flywheel damper supporting structure using the bearing.

[0002]

2. Description of the Related Art In an automobile flywheel damper, as shown in FIG. 6, an engine-side mass 2 and a transmission-side mass 3 are mutually supported by rolling bearings 56. As the bearing 56, a deep groove ball bearing with a seal is generally used. That is, the bearing 56 is formed by the inner ring 61 and the outer ring 62.
, A rolling element 64 is interposed therebetween, and contact seals 65 on both sides are provided. The contact seal 65 includes the outer ring 62.
And a plurality of lip portions 65 slidably contacting the inner ring 61.
c, 65d at the tip. The inner ring 61 is attached to the shaft portion 2 a of the engine-side mass 2, and the outer ring 62 is attached to the inner diameter surface of the transmission-side mass 3.

[0003]

As the engine speed increases in recent years, the temperature rise of the engine side mass 2 has increased. When the temperature of the engine-side mass 2 becomes high in this way, the heat causes the internal pressure of the bearing 56 to rise, and the air inside the bearing may blow out from the contact surface of the contact seal 56 together with the lubricating grease. Therefore, the grease in the bearing 56 is reduced at an early stage, and the lubrication performance is reduced. In addition, there is a possibility that a malfunction due to slippage of the clutch plate may occur due to the blowout grease.

[0004] It is an object of the present invention to provide a flywheel damper bearing in which an excessive rise in internal pressure can be prevented to prevent grease from leaking, and even if grease leaks, problems caused by slippage of the clutch plate can be avoided. It is to provide a flywheel damper support structure.

[0005]

SUMMARY OF THE INVENTION A flywheel damper bearing according to the present invention is a bearing for mutually supporting an engine-side mass and a transmission-side mass of a flywheel damper. A rolling element is interposed between the rolling elements, and on both sides of the rolling element, there are contact seals attached to one of the inner ring and the outer ring so as to be in sliding contact with the other, and the contact seal has a plurality of lip portions serving as contact pieces. Applies to those having In this bearing, a slit for venting air is provided on the innermost lip portion of the contact seal located on the side opposite to the engine-side mass in a sliding contact portion with the raceway ring. According to this configuration, when the internal pressure of the bearing rises with the temperature rise of the engine side mass, the air in the bearing escapes from the slit provided in the innermost lip portion of the contact seal, and the outer lip portion and the raceway ring From the sliding surface of the bearing to the outside of the bearing. If the internal pressure is high to some extent, the internal lip alone cannot withstand the pressure and the internal pressure is released. At this time, the internal pressure is released slowly, so that no grease is discharged. Therefore, it is possible to prevent the internal pressure of the bearing from excessively increasing and blowing out together with the internal grease. In this way, grease is prevented from being blown out, but even if grease leaks due to a sudden rise in temperature, the slit is located on the side opposite to the engine side mass, and grease leakage is on the opposite side to the engine. A problem due to slippage of the clutch plate when grease leaks to the side can be avoided. Further, since the slit is provided in the contact seal located on the side opposite to the engine-side mass, the outside of the contact seal is generally an open space, and the internal pressure can be satisfactorily released. Also, because the slit is provided on the innermost lip,
When dust enters the bearing or between the inner and outer lips,
It is prevented by the outer lip.

In the present invention, the inner race has seal grooves on both sides of the raceway surface on the outer diameter surface, and the contact seal is attached to the outer race, and the contact seal is provided on the inner race center side of the seal groove of the inner race. An inner lip sliding on the side,
An outer lip portion that is in sliding contact with the outer surface of the inner ring outside the seal groove, and the slit may be provided at a tip of the inner lip portion.

In the flywheel damper support structure of the present invention, the engine-side mass and the transmission-side mass of the flywheel damper are mutually supported by bearings, and the bearing is provided between a raceway inner race and an outer race. Intervenes,
On both sides of the rolling element, there is a contact seal attached to one of the inner ring and the outer ring and slidingly contacting the other, and this contact seal is a bearing having a plurality of lip portions serving as contact pieces, A slit for venting air is provided on the innermost lip portion of the contact seal located on the side opposite to the engine side mass in a sliding contact portion with the race. According to this configuration, similar to the operation of the bearing of the present invention described above,
Excessive increase in the internal pressure of the bearing is prevented, and leakage of grease can be prevented.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. First, the flywheel damper support structure will be described. The upper half of FIG. 4 shows the A-O cross section of FIG. 5, and the lower half of FIG. 4 shows the B-O cross section of FIG. This flywheel damper support structure is a flywheel 1
Is divided into an engine-side mass 2 and a transmission-side mass 3, and a compression spring 4 and a damping mechanism 5 are provided therebetween. In a flywheel damper having the flyhole 1 itself as a damper structure, the two masses 2 and 3 are mutually connected. It is supported by the bearing 6. As the bearing 6, a rolling bearing is used so that damping is performed smoothly. Output torque from the engine enters from an engine-side mass 2 directly connected to a crankshaft (not shown), and is transmitted to a driven system via a compression spring 4, a damping mechanism 5, and a transmission-side mass 3. In this case, depending on the magnitude of the output torque of the engine, the bending of the compression spring 4 and the operation of the damping mechanism 5 occur,
In this state, the torque fluctuation is absorbed by the compression spring 4 and the damping mechanism 5, so that the transmission-side mass 3 rotates with respect to the engine-side mass 2 with the damped rotation fluctuation amount.
The damping mechanism 5 is formed by an oil chamber 5 a, and rotation transmission between the two masses 2 and 3 via the compression spring 4 and the damping mechanism 5 is performed via a driven plate 7. The driven plate 7 is connected to the transmission-side mass 3 by serrations 8 provided on the inner diameter portion. A stopper 9 is provided on the engine-side mass 2 in correspondence with the protrusion 7 a provided on the outer diameter of the driven plate 7.

The bearing 6 is a deep groove ball bearing with a seal shown in FIG. 1 (A), and a rolling element 14 such as a steel ball held by a retainer 13 is interposed between an inner ring 11 and an outer ring 12 so as to have both sides. And a ring-shaped contact seal 15 is provided. The contact seal 15 is an elastic seal in which a rubber body 15b is integrated with a cored bar 15a.
A plurality of lip portions 15c, 15d located inside and outside each other are provided. The outer circumference of the contact seal 15 is fitted in a seal mounting groove 16 formed in the inner diameter surface of the outer ring 12. Seal grooves 17 are formed on the outer diameter surface of the inner ring 11 on both sides of the raceway surface 11a. As shown in FIG. 1B, the lip portion 15c inside the contact seal 15 is located at the center of the inner ring in the seal groove 17. Slidably contacts the inner surface 17a on the side. The outer lip portion 15 d is in sliding contact with the outer surface of the inner race outside the seal groove 17. In the natural state, as shown in FIG.
The lip portion 15c is elastically deformed as shown in FIG. 1 (B) by coming into contact with the inner ring 11 to be brought into a press-contact state.

This bearing 6 is the same as the above-described bearing.
For only the contact seal 15 on the side opposite to the engine-side mass 2 (the right side in FIG. 1), a slit 18 for venting air is provided in the inner lip portion 15c in a sliding contact portion with the inner ring 11. The slit 18 is provided at one or more positions in the circumferential direction of the contact seal 15. The cross-sectional shape of the slit 18 is
For example, as shown in FIG. 3, the width B is larger than the depth d.

The mounting of the bearing 6 on the two masses 2 and 3 is performed as follows. As shown in FIG. 4, the inner ring 11 is fitted on the outer diameter surface of the hollow shaft portion 2 a formed on the inner diameter portion of the engine-side mass 2, and is prevented from falling off by the retaining ring 20. Outer ring 1
Reference numeral 2 is fitted on the inner diameter surface of the cylindrical portion 3a formed on the inner diameter portion of the transmission-side mass 3, and is prevented from falling off by the retaining ring 21 fitted into the retaining ring groove formed on this inner diameter surface.

According to the flywheel damper support structure of this configuration and the bearing 6, since the slit 18 is provided in the inner lip portion 15 c of the contact seal 15 of the bearing 6, the internal pressure of the bearing 6 increases with the temperature rise of the engine-side mass 2. Rises, the air in the bearing 6 escapes from the slit 18 provided in the inner lip portion 15c of the contact seal 15, and escapes from the sliding contact surface between the outer lip portion 15d and the inner ring 11 to the outside of the bearing.
When the internal pressure is high to some extent, the internal lip is not released by the outer lip portion 15d alone, and the internal pressure is released. At this time, the internal pressure is released slowly, so that no grease is discharged. This prevents the internal pressure of the bearing 6 from rising excessively and blowing out together with the internal grease. Since the slit 18 is provided in the contact seal 15 located on the side opposite to the engine-side mass 2, the outside of the contact seal 15 is an open space, and the internal pressure can be discharged well. Further, since the slit 18 is provided in the innermost lip portion 15c, dust is prevented from entering the bearing 6 and between the inner and outer lip portions 15c and 15d by the outer lip portion 15d.

In the above-described embodiment, the contact seal 15 has the two inner and outer lips 15c and 15d. However, three or more lips may be provided inside and outside. Further, although the contact seal 15 is attached to the outer ring 12 and slidably contacts the inner ring 11, the contact seal 15 may be attached to the inner ring 11 and slidably contact the outer ring 12.

[0014]

According to the flywheel damper bearing of the present invention, the innermost lip of the contact seal located on the side opposite to the engine-side mass is provided with a slit for venting air. The internal pressure is prevented from rising, and grease leakage accompanying the release of the internal pressure can be prevented.
Further, even if grease leaks, a problem due to slippage of the clutch plate can be avoided. In the flywheel damper support structure of the present invention, since the innermost lip portion of the contact seal located on the side opposite to the engine side mass is provided with a slit for air release for the bearing for mutual support of both masses, the engine side mass Excessive rise in the internal pressure of the bearing due to the high heat can be prevented, and leakage of the grease of the bearing due to release of the internal pressure can be prevented. Therefore, smooth damper performance is maintained for a long time. Further, even if grease leaks, a problem due to slippage of the clutch plate can be avoided.

[Brief description of the drawings]

FIG. 1A is a partial cross-sectional view of a flywheel damper bearing according to an embodiment of the present invention, and FIG. 1B is a partially enlarged cross-sectional view of a contact portion between the contact seal and an inner ring.

FIG. 2 is a partially enlarged sectional view showing a natural state of the contact seal.

FIG. 3 is a partial sectional view showing an inner lip portion of the contact seal cut in a circumferential direction.

FIG. 4 is a sectional view of a flywheel damper support structure according to one embodiment of the present invention.

FIG. 5 is a cutaway front view of the flywheel damper support structure.

FIG. 6 is a sectional view of a conventional example.

[Explanation of symbols]

 2 ... Engine side mass 3 ... Transmission side mass 4 ... Compression spring 5 ... Damping mechanism 6 ... Bearing 11 ... Inner ring 12 ... Outer ring 15 ... Contact seal 15c ... Inner lip 15d ... Outer lip 17 ... Seal groove

Claims (3)

[Claims] 1. A bearing for mutually supporting an engine-side mass and a transmission-side mass of a flywheel damper, wherein a rolling element is interposed between an inner ring and an outer ring which are race rings, and on both sides of the rolling element, A contact seal attached to one of the inner ring and the outer ring and slidingly contacting the other is provided on a bearing having a plurality of lip portions serving as contact pieces, on a side opposite to the engine-side mass. A slit for air release is provided in the innermost lip portion of the contact seal to be slid in contact with the raceway ring. 2. The inner ring has seal grooves on both sides of a raceway surface on an outer diameter surface, the contact seal is attached to the outer ring, and the contact seal is provided on a side surface of the seal groove of the inner ring on the inner ring center side. 2. An inner lip portion that slides and an outer lip portion that slides on an outer surface of an inner ring outside the seal groove, wherein the slit is provided at a tip of the inner lip portion.
The described flywheel damper bearing. 3. An engine-side mass and a transmission-side mass of a flywheel damper are mutually supported by bearings,
In this bearing, a rolling element is interposed between an inner ring and an outer ring that are race rings, and has a contact seal attached to one of the inner ring and the outer ring and slidingly contacting the other on both sides of the rolling element. The contact seal is a bearing having a plurality of lip portions serving as contact pieces, and a slit for air release is provided on the innermost lip portion of the contact seal located on the side opposite to the engine side mass with a raceway ring. A flywheel damper support structure provided at a contact portion.