JPH0648036B2 - Flywheel support structure - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flywheel support structure that supports a flywheel to which power is transmitted from a drive plate that allows bending of an end of a crankshaft.

(Prior Art and Problems Thereof) The applicant has already developed a support structure as shown in FIG. 4 for a flywheel structure of this type and applied for a patent (filing date: April 5, 1985). .

In such a prior art, a drive plate 104 is provided between the crankshaft 100 and the flywheel 102, a minute gap c is provided between the drive plate 104 and the flywheel 102, and the flywheel 102 is fixed by the spherical projection 106 of the flywheel 102. It is swingably supported.

However, since the distance L is separated between the swing center P1 of the spherical protrusion 106 and the mass center P2 of the flywheel 102, there is a problem that the swing of the flywheel 102 is not smooth.

(Object of the Invention) The present invention provides a flywheel support structure that supports a flywheel to which power is transmitted from a drive plate that allows bending of an end of a crankshaft. It is an object of the present invention to provide a flywheel support structure that can improve the power consumption and reduce the impact on the flywheel when the clutch is engaged.

(Structure of the Invention) (1) Technical Means The present invention is a support structure that supports a flywheel to which power is transmitted from a drive plate that allows bending of an end portion of a crankshaft. The flywheel is supported by a spherical bearing formed so that the center of the spherical surface is located within the axial width of the flywheel while being set within the axial width of the wheel, and the flywheel is placed between the flywheel and the spherical bearing. Axial sliding means is provided so that it can move axially with respect to the spherical bearing. The crankshaft side of the flywheel comes into contact with the drive plate and restricts the displacement of the flywheel toward the crankshaft side. The flywheel support structure is characterized in that a portion is formed.

(2) Action The flywheel is supported by the spherical bearing so that the center of mass of the flywheel and the center of swing of the flywheel are substantially aligned with each other, so that the flywheel swings smoothly around the spherical bearing.

Further, the flywheel moves in the axial direction by the axial sliding means.

Further, the displacement of the flywheel is restricted by the contact of the contact portion of the flywheel with the drive plate.

(Embodiment) The present invention is shown in FIG.
Is a crankshaft, and a flywheel 12 is swingably connected to a rear end portion of the crankshaft 10 by a spherical bearing 40 described later in detail. First and second flexible plates 14a and 14b (drive plates) are provided between the front surface of the flywheel 12, that is, the surface facing the engine body and the crankshaft 10. Both flexible plates 14a and 14b are members that absorb only bending vibration from the crankshaft 10.

A clutch disc 16 is provided on the rear surface side of the flywheel 12.
The clutch disc 16 is spline-fitted to the input shaft 15a of the rear stage transmission in a slidable manner. The front end of the input shaft 15a is pivotally supported by a through hole 48 of the spherical bearing 40, which will be described later in detail.

A pressure plate 18 is provided so as to press the facing 17 a of the clutch disc 16 toward the flywheel 12.
Is pressed by the diaphragm spring 20. The diaphragm spring 20 is supported by the clutch cover 22 via the wire ring 21a and the stud pin 21b, and the clutch cover 22 covers the facing 17a, the pressure plate 18, etc., and is fixed to the rear surface of the flywheel 12.

A release bearing 26 is axially slidably fitted between the inner peripheral portion of the diaphragm spring 20 and the fixed cylindrical shaft 24, and the release bearing 26 transmits the release force from the clutch pedal to the diaphragm spring 20. It is structured. The fixed cylinder shaft 24 is fixed to a clutch housing (not shown) of the transmission.

Flywheel 12, both flexible plates 14a,
The detailed structure of 14b will be described. The first flexible plate 14a has a substantially circular plate shape that is relatively thick and has a large bending rigidity, and the radially inner peripheral portion of the first flexible plate 14a is fixed to the crankshaft 10 with bolts 15c. The second flexible plate 14b is thinner than the first flexible plate 14a and has a substantially circular plate shape with a small bending rigidity, and faces the first flexible plate 14a.

The bolts 15c are provided at a plurality of portions in the circumferential direction at equal intervals, and the bolts 15c are housed in the holes 15d of the flywheel 12. 1st flexible plate 1
A ring gear 15e is fixed to the outer peripheral surface of 4a in the radial direction.

The outer peripheral portion of the first flexible plate 14a is fastened together with the second flexible plate 14b by bolts 15f.

The inner peripheral portion of the second flexible plate 14b has bolts 15
It is fixed to the flywheel 12 with g. Further, a minute gap c of, for example, about 0.2 mm is provided between the flywheel 12 and the first flexible plate 14a.

Therefore, the torque from the crankshaft 10 is transmitted from the flexible plate 14 to the flywheel 12, and the flywheel 12 is supported by the spherical bearing 40 so as to be slidable in the axial direction. Further, the crankshaft 10 can freely vibrate in the range of the minute clearance c while being insulated from the flywheel 12 about the spherical bearing 40.

The spherical bearing 40 is a member made of gun metal having a sleeve 42, a flange 44, and a spherical projection 46. The sleeve 42 and the flange 44 are press-fitted into the crankshaft 10, and the flange 44 is fixed to the inner peripheral side surface of the first flexible plate 14a. The spherical projection 46 is a flywheel 12.
Is in line contact with the inner peripheral surface 11a of the flywheel 12 and supports the flywheel 12 so as to be swingable about the swing center P1 and slidable in the axial direction within the range of the minute gap c.

The mass center P2 of the flywheel 12 is located near the swing center P1. The tip of the input shaft 15a is rotatably fitted in the through hole 48 of the spherical bearing 40.

The spherical bearing 40 is not limited to being press-fitted into the crankshaft 10, and the flange 44 may be fixed to the crankshaft 10 by bolting, for example. Also, the through hole 48 and the input shaft 1
Rolling bearings such as ball bearings may be interposed between the tip portions of 5a.

Next, the operation will be described. When the crankshaft 10 rotates, torque is transmitted to the flywheel 12 via both the flexible plates 14a and 14b. The flexural vibration of the crankshaft 10 is absorbed by both the flexible plates 14a and 14b, the flexural vibration from the crankshaft 10 is not transmitted to the flywheel 12, and the vibration of the crankshaft 10 centering on the spherical bearing 40 is in the minute gap c. Insulated.

Further, the flywheel 12 has a swing center P1 of the spherical bearing 40.
Although it swings in the direction of the arrow A around the center, the distance between the swing center P1 and the center of mass P2 is greatly shortened compared to the conventional one. The moment of inertia of the flywheel 12, which is the center of the flywheel 12, is reduced by the amount by which the distance between the swing center P1 and the mass center P2 is greatly shortened, and the responsiveness and convergence of the swing motion are improved.

When the clutch disc 16 is disengaged from the pressure plate 18, the flywheel 12 moves forward by a minute gap c due to the pressing force of the release bearing 26 on the diaphragm spring 20, and the flywheel 12 and the first flexible plate 14a move. In close contact. In this state, the pressing force of the release bearing 26 is received by the rear end surface of the crankshaft 10, so that the spherical bearing 4
No load is applied to 0, and the durability is excellent.

(Effects of the Invention) As described above, the support structure for a flywheel according to the present invention is a support structure for supporting a flywheel to which power is transmitted from a drive plate that allows bending of an end of a crankshaft. The center of mass of the flywheel is set within the axial width of the flywheel, and the flywheel is supported by a spherical bearing formed so that the center of the spherical surface is located within the axial width of the flywheel. It is movable in the axial direction with respect to the spherical bearing by means of axial sliding means provided between the flywheel and the crankshaft side of the flywheel. Since the contact portion that regulates is formed, the following effects can be obtained.

First, the flywheel 12 has a swing center P of the spherical bearing 40.
1 swings in the direction of arrow A, but the distance between the swing center P1 and the mass center P2 is greatly shortened compared to the conventional case, so that when the swing motion is performed, the swing center P1
The moment of inertia of the flywheel 12 centered on
Since the distance between the swing center P1 and the mass center P2 is greatly reduced, the distance is reduced, and the responsiveness and convergence of the swing motion can be improved.

Since the through hole 48 of the spherical bearing 40 also serves as a conventional pilot bearing, it is not necessary to provide 15b in FIG. 3, the number of parts is reduced, and the structure is simplified.

Further, since the flywheel 12 is provided not only to be swingable but also to be movable in the axial direction, the impact of the flywheel 12 when the clutch is engaged can be further alleviated, and the power transmission from the drive plate can be performed more smoothly. You can

Furthermore, since the displacement of the flywheel 12 when the clutch is engaged is restricted by the contact portion contacting the drive plate, it is possible to prevent an excessive load from being applied to the vicinity of the bearing portion of the flywheel 12.

(Another Embodiment) (1) A second embodiment will be described with reference to FIG. Note that, in FIG. 2, parts given the same reference numerals as those in FIG. 1 indicate the same or corresponding parts.

An outer ring 50 is interposed between the spherical protrusion 46 of the spherical bearing 40 and the inner peripheral surface 11 a of the flywheel 12. As shown in FIG. 3, the outer ring 50 has an inner peripheral spherical surface 52 that is in sliding contact with the entire outer peripheral surface of the spherical projection 46.

Between the outer peripheral surface of the inner peripheral spherical surface 52 and the inner peripheral surface of the ring 54,
For example, a rubber annular rubber ring 56 is baked on both sides, and the elasticity of the rubber ring 56 holds the flywheel 12 slidably in the axial direction within the range of the minute gap c. The ring 54 is the inner peripheral surface 11a of the flywheel 12.
Is fitted to.

A cylindrical boss portion 30 (support portion) extending rearward is formed on an inner peripheral portion of the clutch cover 22 in the radial direction,
A metal or resin bearing 32 is interposed between the tubular boss portion 30 and the outer ring 27 a of the release bearing 26.

Therefore, a part of the mass of the flywheel 12, the clutch cover 22 and the like is supported by the fixed cylindrical shaft 24 via the release bearing 26, so that the vibration preventing effect of the flywheel 12 is more effective.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a clutch to which the present invention is applied, FIG. 2 is a vertical sectional view showing another embodiment, FIG. 3 is an enlarged view of part a of FIG. 2, and FIG. 4 shows a conventional example. FIG. 10 ……
Crankshaft, 12 ... Flywheel, 14a, 14b
...... First and second flexible plates, 16 ...... Clutch disc, 40 ...... Spherical bearing, 42 ...... Sleeve, 4
4 ... Flange, 46 ... Spherical projection, 48 ... Through hole,
56 ... Rubber ring

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toru Hamada 1-1-1, Kidamotomiya, Neyagawa-shi, Osaka Daikin Co., Ltd. (56) References 57-58542 (JP, B2)

Claims (3)

[Claims] 1. A support structure for supporting a flywheel to which power is transmitted from a drive plate which allows bending of an end of a crankshaft, wherein a center of mass of the flywheel is set within an axial width of the flywheel. , A flywheel is supported by a spherical bearing formed so that the center of the spherical surface is positioned within the axial width of the flywheel, and the flywheel is a spherical bearing by axial sliding means provided between the flywheel and the spherical bearing. The flywheel is movable in the axial direction with respect to the flywheel, and a contact portion is formed on the crankshaft side of the flywheel to contact the drive plate and restrict the displacement of the flywheel toward the crankshaft side. Wheel support structure. 2. The axial sliding means brings the flat inner peripheral surface of the flywheel into contact with the spherical surface of the spherical bearing by line contact,
The flywheel support structure according to claim 1, wherein the flywheel support structure is configured by providing an axial gap between the flywheel and the drive plate. 3. The axial sliding means comprises an outer ring fitted to a spherical bearing provided so as to be connected to a crankshaft so as to be slidable on the spherical surface, and a fly is laid on the outer ring via a rubber ring. It is configured by supporting a wheel, and providing a rubber ring between the outer peripheral surface of the outer ring and the inner peripheral surface of the flywheel so as to be fixed to the both surfaces, and providing an axial gap between the flywheel and the drive plate. The support structure for the flywheel according to claim 1.