KR20090102150A - Flywheel by manufacture method and such method of automobile flywheel - Google Patents

Abstract

PURPOSE: A flywheel for vehicle and a manufacturing method thereof are provided to provide accurate information about engine rotation by preventing foreign substances from being caught in the crank shaft position sensor wheel. CONSTITUTION: A manufacturing method of flywheel for vehicle comprises a step of preparing a press-fitting a crank shaft position sensor wheel and press-fitting it into a flywheel through a blanking process for forming grooves at regular intervals on a conductive metal plate and a rounding and welding process for attachment to the inner side of the flywheel, a step of preparing a material(11) having a trapezoidal cross-section and attaching it to the outer side of the flywheel through a rounding and welding process, a step of performing inside and outside sizing and surface compacting by a press, a step of forming a gear through a hobbing process, and a step of preparing a ring gear and press-fitting it to the outer side of the flywheel through a chambering and high frequency thermal process.

Description

Flywheel by manufacture method and such method of automobile flywheel

The present invention provides a method and a method for manufacturing an automotive fly wheel configured to provide durability and quality of a crankshaft position sensor wheel and a ring gear constituting an automotive fly wheel, and at the same time, to provide simplicity and low cost. By a fly wheel.

As is well known, the configuration of a flywheel used in a vehicle includes a crankshaft position sensor wheel mounted on the crankshaft to measure an engine speed, and formed on the inner side of the flywheel. A plurality of ring gears are formed at predetermined angles and intervals to interact with the Dix gear.

The flywheel is generally made of a sintered material having relatively low mechanical properties because it must be manufactured very precisely to accurately detect the driving state of the engine.

However, the fly wheel made of sintered material has a disadvantage in that a crack phenomenon due to fatigue accumulation occurs even at a small relative displacement between the crankshaft and the crank position sensor wheel under the high average stress generated when the bolt is fastened due to low physical properties.

In order to solve this disadvantage, the hobbing process was performed when the crankshaft position sensor wheel was formed inside the flywheel processed with the casting material.

In addition, the ring gear formed on the outer circumferential surface of the flywheel is manufactured separately, and then fixed by pressing. The material for manufacturing the ring gear is shown in FIG. 1 in consideration of deformation of the material due to rounding when rounding. Rounding was performed using a material 100 formed in a rectangular shape, and both ends were welded.

Then, since both sides 101 of the raw material 100 unnecessarily widened by rounding are formed, the inner and outer diameters are turned, and the two sides 101 unnecessarily widened by rounding are removed by turning. The chamfering process was performed, and the ring gear was completed by the high frequency heat processing process.

The completed ring gear is press-fitted to the outer circumferential surface of the flywheel to fix the flywheel assembly for an automobile.

In this case, it is not easy to form the crank position sensor wheel by hobbing on the inside of the fly wheel, which has a disadvantage in that productivity is reduced.

In addition, when forming a ring gear press-fitted on the outer circumferential surface of the fly wheel, both sides 101 of the material 100, which are unnecessarily widened by the rounding process, are removed by turning, thereby causing waste of material and additional processes. As manufacturing costs rise, external competitiveness has fallen.

The present invention for solving the above problems provides a method for manufacturing a flywheel at a simple and inexpensive cost by a step of separately manufacturing the crankshaft position sensor wheel and the ring gear and press-fit into the flywheel,

In particular, by providing the crankshaft position sensor wheel and the ring gear constituting the flywheel by the above method, there is a desire to provide a flywheel with very improved durability and quality.

Method for manufacturing a flywheel for automobiles according to the present invention for achieving the above object is to provide a crankshaft position sensor wheel constituting the flywheel by blanking and rounding and welding the metal plate or blanking and bending the metal plate and Prepared by synthetic resin injection,

In addition, the ring gear is prepared by preparing a material with a trapezoidal cross section by rounding and welding, forming a shape by a press, and forming a gear by hobbing, or by preparing a round material with a cross section. And forming a gear by welding and forging to provide a ring gear and press-fitting the flywheel, wherein the crankshaft position sensor wheel and the flywheel are provided with the ring gear.

According to the present invention as described above, a flywheel for a vehicle can provide a flywheel at a simple and low cost by providing a flywheel manufacturing method capable of simply manufacturing a crankshaft position sensor wheel and a ring gear and completing the pressing process. It can be effective

Increased durability of the flywheel, and especially the structure of the crankshaft position sensor wheel without foreign matters, can provide accurate information about the engine's rotation, thereby enhancing the competitiveness of the car by providing a flywheel with very high quality and reliability. There is.

1 is an exemplary view showing a conventional ring gear manufacturing process

Figure 2 is a ring gear manufacturing process according to the present invention

Figure 3 is another ring gear manufacturing process according to the present invention

4 is a perspective view of a crankshaft position sensor wheel according to the present invention.

5 is a perspective view of another crankshaft position sensor wheel

FIG. 6 is a cross-sectional view of the fly wheel manufactured by FIGS. 2 and 4;

7 is a cross-sectional view of the fly wheel manufactured by FIGS. 3 and 5

8 is an exemplary vehicle fly wheel according to the present invention

*** Explanation of symbols for main parts of drawing ***

 1: crankshaft position sensor wheel

 3:22: Home

 10: ring gear

 11: lozenge material

 12: gear

 15: round material

 21: inner ring

 23: Metal Edition

 24: paddle

Hereinafter, with reference to the accompanying drawings, a method of manufacturing a flywheel for a vehicle according to the present invention and a preferred embodiment of the flywheel according to such a method will be described in detail.

Figure 2 is a ring gear manufacturing process diagram according to the present invention, Figure 3 is another ring gear manufacturing process diagram according to the present invention, Figure 4 is a perspective view of the crankshaft position sensor wheel according to the present invention, Figure 5 is another crankshaft 6 is a perspective view of a position sensor wheel, FIG. 6 is a fly wheel sectional view manufactured by FIGS. 2 and 4, FIG. 7 is a fly wheel sectional view manufactured by FIGS. 3 and 5, and FIG. to be.

As shown in FIGS. 4 and 5, the crankshaft position sensor wheel 1 constituting the flywheel is rounded and welded to be installed on the inside of the flywheel and the blanking so that grooves 3 are formed at regular intervals on a metal plate of magnetic material. We prepare by process.

Alternatively, the inner ring 21 and the grooves 22 and the metal pieces 23 are formed at a predetermined interval to form the inner ring 21 and the metal pieces 23 to be installed on the inner side of the fly wheel by using a magnetic plate made of magnetic material. The non-magnetic synthetic resin layer 25 is integrally formed in the grooves 22 formed therebetween.

Then, as shown in Figures 2 and 3, the ring gear 10 is prepared by the rounding and welding process to prepare a material 11 having a trapezoidal cross section when the material is prepared to be coupled to the outer peripheral surface of the flywheel, Internal and external diameter sizing and surface compaction process, forming a gear 12 by hobbing processing, and chambering and high frequency heat treatment process.

Alternatively, the ring gear 10 may be prepared by preparing a material 15 having a circular cross section and completing the rounding and welding to simultaneously form the gear 12 and the chambering by forging in order to join the outer peripheral surface of the flywheel. .

The crankshaft position sensor wheel 1 and the ring gear 10 provided in this way are fixed to the flywheel main body 30 prepared by casting.

That is, the crankshaft position sensor wheel 1 is fixed to the inner side of the flywheel main body 30, and the ring gear 10 is fixed to the outer circumferential surface of the flywheel main body 30 by press fitting.

Since the crankshaft position sensor wheel 1 fixed to the inside is formed of a metal plate which is a magnetic material, the flywheel according to this manufacturing method can have sufficient durability and can be maintained continuously when installed inside the flywheel.

In addition, when the inner ring 21 and the outer ring 24 are formed of a metal plate, and the inner ring 21 and the groove 22 are filled with the synthetic resin layer 25, foreign substances are accumulated in the groove 22 to form scale during use. This can be solved perfectly, so that the engine speed can be accurately provided.

In addition, among the ring gears fixed to the outer circumferential surface of the flywheel, the strength of the ring gear is very strong in the case of forging, so that it can be protected from abrasion and impact by the Bendix gear of the starting motor.

Claims (3)

Providing a crankshaft position sensor wheel (1) by a blanking process for forming grooves (3) at regular intervals on a metal plate, which is a magnetic body, and a rounding and welding process for coupling to the inside of the flywheel, and pressing the inside of the flywheel; Rounding and welding process for preparing the material 11 having a trapezoidal cross section and joining to the outer circumferential surface of the flywheel, internal and external diameter sizing and surface compaction process by press, and forming a gear 12 by hobbing process And, providing a ring gear (10) by chambering and high frequency heat treatment and press-fitting the outer circumferential surface of the flywheel. Providing an outer ring 24 in a configuration in which the inner ring 21, the grooves 22, and the metal pieces 23 are installed at regular intervals by a metal plate material that is a magnetic material; Forming a synthetic resin layer (25) by injection into a groove (22) formed between the inner ring (21) and the metal pieces (23) to provide a crankshaft position sensor wheel (1) and press-fit it into the fly wheel; A ring gear 10 is provided in a rounding and welding process for preparing a material 15 having a circular cross section and coupled to the outer circumferential surface of the flywheel, and a forging process for simultaneously performing the gear 12 and the chambering, and the outer circumferential surface of the flywheel. Method for manufacturing a flywheel for automobiles, comprising the step of pressing in. Crankshaft position sensor wheel (1), in which grooves (3) are formed at regular intervals on a metal plate of magnetic material, Alternatively, the crankshaft position sensor wheel (1) in which the inner ring (21), the groove (22), and the metal pieces (23) are formed at regular intervals and the synthetic resin layer (25) is formed in the inner ring (21) and the groove (22) are made of magnetic material. Fly wheel for cars, characterized in that it is provided.