JP4615454B2 - Flexible plate device - Google Patents

Description

  The present invention relates to a flexible plate device in which a driven mechanism such as a flywheel is connected to a crankshaft of an engine, which is an internal combustion engine, via an elastic plate for reducing bending vibration.

  An engine that is an internal combustion engine is provided with a flywheel to stabilize the rotation of the crankshaft and the like, but the natural frequency of the vibration in the bending direction of the crankshaft and the flywheel is in the normal range of the engine frequency. If it exists, a bend will arise in a rotating shaft etc., thereby, a bending vibration will arise and it will be a cause which generate | occur | produces abnormal noises, such as a booming sound in a vehicle interior.

  For this reason, for the purpose of reducing bending vibration, an elastic plate is provided between the crankshaft and the flywheel, which has high rigidity in the torsional direction of the rotating shaft and low rigidity in the bending direction. As a result, the natural frequency of the bending vibration of the crankshaft is changed from the normal range of the engine frequency to another range, thereby reducing the occurrence of abnormal noise.

As a conventional flexible plate device in which a mass body such as a flywheel is connected to a crankshaft via an elastic plate, for example, a device described in Patent Document 1 is known. This is because when the flywheel mass (mass body) is attached to the crankshaft via a flexible plate (elastic plate), both members are connected when the inner peripheral side of the flexible plate is connected to the crankshaft via a bolt. In order to make the surface pressure of the contact surface uniform, a flat ring-shaped reinforcement plate (reinforcing plate) is provided as a contact plate that presses the flexible plate against the end surface of the crankshaft. Bolts that pass through are screwed to the crankshaft.
JP 2001-12552 A

  However, when the thickness of the flexible plate is reduced to reduce the axial distance between the crankshaft and the flywheel mass, there is a problem that the surface pressure distribution is not uniform in the circumferential direction. That is, when the plate thickness is reduced, the surface pressure near the bolt is high in the circumferential direction, but the surface pressure between the bolts is insufficient, so the flexible plate repeats axial vibration with respect to the crankshaft. Further, there is a problem that wear at the boundary position between the portion where the surface pressure of the flexible plate is high and the portion where the surface pressure is low is increased, and the flexible plate is unevenly worn.

  Accordingly, an object of the present invention is to provide a flexible plate device that solves the above-described problems, makes the surface pressure distribution in the vicinity of the bolts and between the bolts substantially uniform, and suppresses uneven wear in the vicinity of the bolts of the flexible plate. To do.

  According to the first aspect of the present invention, the inner peripheral side of the elastic plate is coupled to the end surface of the drive shaft of the internal combustion engine, while the outer peripheral side of the elastic plate is coupled to the driven mechanism, and the inner periphery of the drive shaft and the elastic plate In the coupling structure with the side, a ring-shaped reinforcing plate is arranged at a position sandwiching the elastic plate by the drive shaft in the axial direction, and arranged at substantially equal intervals along the circumferential direction, and the reinforcing plate and the In the flexible plate device in which a plurality of bolts penetrating the elastic plate are screwed to the end face of the drive shaft, the reinforcing plate is formed in a disc spring shape, and the vicinity of the outer peripheral surface of the side surface of the reinforcing plate is the elastic plate. Each of the bolts is tightened in a contact state.

  According to this invention, since the bolt is tightened in a state where the vicinity of the outer peripheral surface of the side surface of the disc spring-shaped reinforcing plate is in contact with the elastic plate, when the bolt is tightened, the reinforcing plate is changed from the disc spring shape to the flat plate state. As a result, the urging force is generated when the reinforcing plate attempts to return to its original shape, and the urging force causes the elastic plate to move around the entire circumference of the elastic plate near the outer peripheral surface of the driving shaft. Press to. For this reason, also between the bolts in the circumferential direction, the urging force always acts on the elastic plate from the reinforcing plate. Therefore, regarding the surface pressure between the reinforcing plate and the elastic plate, the difference in the surface pressure between the vicinity of the bolt and between the bolts is reduced, and the surface pressure is substantially uniform over the entire circumference in the circumferential direction. Therefore, uneven wear of the elastic plate is suppressed.

  According to a second aspect of the present invention, in the flexible plate device according to the first aspect, the reinforcing plate is moved outwardly from an outer peripheral contact portion which is a position on the outermost peripheral side where the reinforcing plate and the elastic plate are in contact. A smooth surface having a substantially arc shape is formed.

  According to this invention, since the substantially arc-shaped smooth surface is formed on the reinforcing plate from the outer peripheral contact portion to the outside, even if the elastic plate is bent and pressed against the reinforcing plate, A large force does not act on a part locally.

  According to the flexible plate device of the present invention, the bolts are tightened in the state where the vicinity of the outer peripheral surface of the side surface of the disc spring-shaped reinforcing plate is in contact with the elastic plate, so that the disc spring-shaped reinforcing plate is compressed. The biasing force due to the bolting always acts on the elastic plate from the reinforcing plate even between the bolts in the circumferential direction. Accordingly, the difference in surface pressure between the vicinity of the bolts in the circumferential direction and between the bolts is reduced, and the surface pressure becomes substantially uniform over the entire circumference in the circumferential direction. The uneven wear of the elastic plate between them is suppressed.

  Embodiments of the flexible plate device according to the present invention will be described below.

  FIG. 2 shows a flexible plate device of an engine as an internal combustion engine. An inner peripheral side of a drive plate 1 as an elastic plate is coupled to an end surface 6a of a crankshaft 6 as an output shaft of an engine (not shown). A flywheel 3 as a driven mechanism is coupled to the outer peripheral side of the.

  More specifically, a cylindrical protrusion 6b is formed on the end surface 6a of the crankshaft 6, while a centering hole 1a is formed in the center of the drive plate 1, and the centering hole 1a portion of the drive plate 1 protrudes. The ring-shaped reinforcing plate 2 is fitted to the portion 6b. As shown in an exploded view in FIG. 1, the drive plate 1 and the reinforcing plate 2 are formed with through holes 1b and 2a at substantially equal intervals along the circumferential direction. Then, the bolt 7 inserted through the through holes 1 b and 2 a is screwed into the end face 6 a of the crankshaft 6. On the other hand, on the outer peripheral side of the drive plate 1, a bolt 5 penetrating the outer peripheral side of the drive plate 1 is screwed into the end face of the flywheel 3. Reference numeral 6c denotes a relief groove for making the inner peripheral surface of the drive plate 1 fit properly.

  Prior to assembly, the reinforcing plate 2 has a disc spring shape as shown in FIG. 1, and bolts 7 are tightened in a state where the vicinity of the outer peripheral surface of the side surface of the reinforcing plate 2 is in contact with the drive plate 1. A substantially arc-shaped smooth surface 2c is formed on the reinforcing plate 2 from the outer peripheral contact portion 2b, which is the outermost peripheral position where the reinforcing plate 2 and the drive plate 1 are in contact, outward. Since the outer peripheral contact portion 6d, which is the outermost peripheral position where the crankshaft 6 and the drive plate 1 are in contact with each other, is on the outer peripheral surface of the crankshaft 6, the outer peripheral contact portion 2b is the same position as the outer peripheral contact portion 6d in the radial direction. Therefore, it is formed on an extension line of the outer peripheral surface of the crankshaft 6.

  A transmission (not shown) is connected to the right side of the flywheel 3 in FIG. 1 via a clutch (not shown). In the figure, 4 is a ring gear that meshes with the pinion gear of the cell motor when the engine is started.

  Next, the operation of the flexible plate device will be described.

  During operation of a vehicle equipped with a flexible plate device, a drive plate 1 having a low rigidity in the axial direction and a high rigidity in the rotational direction is interposed between the crankshaft 6 and the flywheel 3 of the engine. Due to the action of the plate 1, the frequency region where the amplitude of the bending vibration generated between the crankshaft 6 and the flywheel 3 reaches a peak is separated into the crankshaft system and the flywheel system. The natural frequency of the bending vibration between the shaft 6 and the flywheel 3 is shifted outside the normal range of the engine frequency, and the bending vibration is reduced.

  According to the present invention, the bolt 7 is tightened with the vicinity of the outer peripheral surface of the side surface of the disc spring-shaped reinforcing plate 2 in contact with the elastic plate 1. Since compression is performed from the spring shape to the flat plate state, an urging force is generated when the reinforcing plate 2 attempts to return to the original shape, and the urging force causes the vicinity of the outer peripheral surface of the reinforcing plate 2 to completely move the elastic plate 1. It presses against the end surface 6a of the crankshaft 6 over the circumference. For this reason, also between the bolts 7 in the circumferential direction, the urging force always acts on the elastic plate 1 from the reinforcing plate 2. Therefore, regarding the surface pressure between the contact surfaces of the reinforcing plate 2 and the elastic plate 1, the difference in the surface pressure between the vicinity of the bolt 7 and between the bolts 7 is reduced, and the surface pressure over the entire circumference in the circumferential direction. Therefore, uneven wear of the elastic plate 1 is suppressed.

  According to the present invention, since the substantially arc-shaped smooth surface 2c is formed outward from the outer peripheral contact portion 2b, the drive from the reinforcing plate 2 even if the drive plate 1 is bent and pressed against the reinforcing plate 2. A large force does not act locally on a part of the plate 1.

  In the present embodiment, the drive shaft is the output shaft. However, the drive shaft may be a rotary shaft connected to the output shaft. Moreover, although the case where the driven mechanism was a flywheel was shown, the driven mechanism may be a torque converter, a torsional vibration reducing device, or a rotational torque fluctuation reducing device.

1 is an exploded view of a flexible plate device (Embodiment 1). FIG. The block diagram which shows a flexible plate apparatus (Embodiment 1).

Explanation of symbols

1 ... Drive plate (elastic plate)
1b, 2a ... through hole 2 ... reinforcing plate 2b ... smooth surface 3 ... fly wheel (driven mechanism)
6 ... Crankshaft (drive shaft)
6a ... end face 7 ... bolt

Claims (2)

While connecting the inner peripheral side of the elastic plate to the end face of the drive shaft of the internal combustion engine, the outer peripheral side of the elastic plate is connected to the driven mechanism,
In the coupling structure between the drive shaft and the inner peripheral side of the elastic plate, a ring-shaped reinforcing plate is disposed at a position sandwiching the elastic plate by the drive shaft in the axial direction, and substantially equidistant along the circumferential direction. And a plurality of bolts penetrating the reinforcing plate and the elastic plate are screw-coupled to an end surface of the drive shaft,
The flexible plate device, wherein the reinforcing plate is formed in a disc spring shape, and the bolts are tightened in a state where the vicinity of the outer peripheral surface of the side surface of the reinforcing plate is in contact with the elastic plate. The flexible plate device according to claim 1,
A flexible plate device characterized in that a substantially arc-shaped smooth surface is formed on the reinforcing plate outward from an outer peripheral contact portion which is a position on the outermost peripheral side where the reinforcing plate and the elastic plate are in contact with each other. .

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