JPH0554848U - Flywheel mounting structure - Google Patents

Abstract

(57) [Summary] [Structure] A flywheel 1 including an elastic plate 2 having high rigidity in the rotational direction and low rigidity in the bending direction, and an annular mass body 4 fixed to an outer peripheral end 2a of the elastic plate 2. A first reinforcing member 5a as a support portion that comes into contact with the side surface of the inner peripheral end portion 2b of the elastic plate 2 and a stopper portion that engages with the inner peripheral end portion 4a of the mass body 4 with a predetermined gap. It is fixed to the end portion 6a of the crankshaft 6 together with the second reinforcing member 5b. [Effect] Since the reinforcing member 5 is divided into the first reinforcing member 5a and the second reinforcing member 5b and the plate thickness of each reinforcing member 5a, 5b is made thin and uniform, each reinforcing member 5a, 5b.
Can be press-molded, and the processing man-hours can be significantly reduced.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a flywheel mounting portion structure used for reducing rotational fluctuations of an automobile engine or the like.

[0002]

[Prior Art]

 In recent years, in order to reduce the muffled noise in the interior of an automobile caused by bending vibration of the crankshaft, an annular mass body that serves as an inertial mass body has an elastic plate that has high rigidity in the rotational direction and low rigidity in the bending direction. A flywheel has been devised that is connected to the crankshaft to absorb not only engine rotational fluctuations but also bending vibration of the crankshaft, and is already generally known.

FIG. 2 shows a structure of a mounting portion of such a flywheel 1. As shown in this figure, the elastic body 2 connecting the mass body 4 and the crankshaft 6 has a thin plate shape and has a small bending rigidity. Therefore, in order to securely fix the crankshaft 6 and the elastic plate 2 and to reinforce the inner peripheral end portion 2b of the elastic plate 2 in which bending stress is generated, the elastic plate 2 together with the reinforcing member 20 is connected to the end portion 6a of the crankshaft 6. It is designed to be fixed with bolts 7 to. The support member 21 is formed on the reinforcing member 20 in contact with the side surface of the inner peripheral end portion 2b of the elastic plate 2, and the inner peripheral end portion 4a of the mass body 4 is engaged with a predetermined gap. The stopper portion 22 is formed so as to prevent the mass body 4 from floating and causing secondary damage to other parts even if the elastic plate 2 is damaged (for example, the actual flat plate 1-67352). (See the official gazette).

[0004]

[Problems to be solved by the device]

 However, in such a conventional example, since the plate thickness of the bolt seat surface portion 23 of the reinforcing member 20 and the plate thickness of the tip portion 22a of the stopper portion 22 are significantly different, the reinforcing member 20 is formed by press working. However, the reinforcing member 20 was formed by cutting the forged product. Therefore, the number of man-hours for processing the reinforcing member 20 increases, which is one of the factors that hinder the reduction of the component manufacturing cost. Therefore, it has been desired to provide a mounting structure for the flywheel 1 that can reduce the number of processing steps for the reinforcing member 20.

[0005]

[Means for Solving the Problems]

 The present invention has been devised in order to meet the above-mentioned demand, and comprises an elastic plate having a large rigidity in the rotating direction and a small rigidity in the bending direction, and an annular mass body fixed to the outer peripheral end of the elastic plate. Of the flywheel together with a reinforcing member having a stopper portion that engages with the inner peripheral end portion of the mass body with a predetermined gap and a support portion that abuts on the inner peripheral end surface of the elastic plate. A structure of an attachment portion of a flywheel fixed to an end portion, characterized in that the reinforcing member is divided into a stopper portion and a support portion.

[0006]

[Action]

 By dividing the reinforcing member, the plate thickness of each reinforcing member becomes thin and uniform, and each reinforcing member can be press-molded.

[0007]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a sectional view showing a structure of a mounting portion of the flywheel 1. As shown in this figure, a flywheel 1 includes a substantially disk-shaped elastic plate 2 having high rigidity in the rotating direction and low rigidity in the bending direction, and an annular plate fixed to the outer peripheral end 2a of the elastic plate 2 with bolts 3. And the mass body 4 of. In the flywheel 1, the inner peripheral end portion 2b of the elastic plate 2 is engaged with the end portions 6a of the crankshaft 6 together with the reinforcing members 5a and 5b, and is fixed to the crankshaft 6 with bolts 7.

The reinforcing members 5a and 5b are both formed into a predetermined shape by press molding. One of them is a first reinforcing member 5a as a support portion that comes into contact with the side surface of the inner peripheral end portion 2b of the elastic plate 2. The other is a second reinforcing member 5b as a stopper portion that engages with the mounting hole 8 and the stepped portion 9 of the inner peripheral end portion 4a of the mass body 4 with a predetermined gap.

Reference numeral 10 is a reinforcing member that reinforces the outer peripheral end portion 2 a of the elastic plate 2, and 11 is a dowel pin that centers the elastic plate 2 and the mass body 4. Further, 12 is a ring gear fixed to the outer peripheral end of the elastic plate 2. The ring gear 12 meshes with a pinion gear of a starter motor (not shown), and transmits the rotation of the starter motor to the crankshaft 6 when the engine is started.

The outer peripheral end of the reinforcing member 5a on the side in contact with the elastic plate 2 is formed into a smooth curved surface 13, and the outer peripheral edge of the end of the crankshaft 6 in contact with the elastic plate 2 and the mass member of the elastic plate 2 are formed. The respective edges of the portion fixed to 4 are made into smooth curved surfaces 14 and 15 so that the elastic plate 2 is not worn by fretting.

According to the above-described structure of the embodiment, the reinforcing member 5 is divided into the first reinforcing member 5a as the support portion and the second reinforcing member 5b as the stopper portion, and each reinforcing member 5 is divided into two parts. Since the plate thicknesses of a and 5b are thin and uniform, each reinforcing member 5a and 5b can be formed into a predetermined shape by press molding. Therefore, the man-hours required to process the reinforcing members 5a and 5b can be significantly reduced as compared with the conventional example in which a forged product is cut.

In the above embodiments, the mode in which the reinforcing member 5 is divided into two has been shown, but the reinforcing member 5 may be divided into two or more in order to facilitate press molding.

[0014]

[Effect of the device]

 As is apparent from the above description, the present invention provides a flywheel including an elastic plate having high rigidity in the rotation direction and low rigidity in the bending direction, and an annular mass body fixed to the outer peripheral end of the elastic plate. A flywheel fixed to the end of the crankshaft together with a reinforcing member having a stopper part that engages with the inner peripheral end of the mass body with a predetermined gap and a support part that contacts the inner peripheral end side surface of the elastic plate. Since the reinforcing member is divided into the stopper portion and the support portion, the plate thickness of each of the divided reinforcing members can be made thin and uniform, and each reinforcing member can be press-molded. The number of man-hours for processing the reinforcing member can be reduced, and the cost of the reinforcing member can be reduced.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a structure of a mounting portion of a flywheel according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of an essential part showing a conventional attachment structure of a flywheel.

[Explanation of symbols]

1 ... Flywheel, 2 ... Elastic plate, 2a ... Outer peripheral end, 2
b ... inner peripheral end part, 4 ... mass body, 4a ... inner peripheral end part, 5 ... reinforcing member, 5a ... reinforcing member (support part), 5b ... reinforcing member (stopper part), 6 ... crankshaft, 6a ... end Department.

Claims (1)

[Scope of utility model registration request] 1. A flywheel comprising an elastic plate having a large rigidity in a rotating direction and a small rigidity in a bending direction, and an annular mass body fixed to an outer peripheral end of the elastic plate, wherein an inner peripheral end of the mass body is provided. In the structure of a mounting portion of a flywheel that is fixed to an end of a crankshaft together with a reinforcing member having a stopper portion that engages with a predetermined gap and a support portion that abuts on a side surface of an inner peripheral end portion of the elastic plate, The flywheel mounting structure is characterized in that the structure is divided into a stopper part and a support part.