JPH10231918A - Gear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gear formed from a gear part and flange part, which are prepared separately and joined together, whereby good vibration controllability and lightweight construction are established. SOLUTION: A gear 1 is configured with a small gear member 10, a large gear member 20, and a flange 30 provided through a press working from a vibration controlling steel plate of such a structure that a resin film 34 is pinched between steel plates 32. The periphery 40 of the flange 30 contacts with the internal circumferential surface of the large gear member 20 and joined by welding parts W1 and W2 generated by the laser welding or electron beam welding. An internal circumferential part 42 of the flange 30 is joined by the welding part W3 to the peripheral surface of the boss 14 of the small gear member 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a gear in which a gear member and a flange member are formed separately.

[0002]

2. Description of the Related Art For example, a timing gear for driving a camshaft, an idle gear, and the like use two large and small gears in combination, and each gear is formed by forging and gear cutting an alloy steel. Have been. Particularly, considering the transmission torque of the large gears, even if the thickness of the flange connecting the teeth and the shaft is thin, it is at best possible to cut out the windows in a window shape due to restrictions on forging. In the current situation, it is hindering weight reduction and the like. JP-A-3-9978
No. 8 discloses a gear structure in which a ring gear is welded to an outer periphery of a drive plate corresponding to a flange member.

[0003]

SUMMARY OF THE INVENTION The present invention provides a gear having the above-mentioned structure, wherein the gear is made of a member obtained by combining different materials of a flange member to thereby improve vibration damping characteristics.

[0004]

The gear of the present invention has a gear member and a flange member formed separately, and the flange member is formed in a double structure by combining different materials, and is joined to the gear member. It is made. And
The flange member is made of a damping steel plate, the flange member is made of a steel plate and cast iron, or the flange member is made of a steel plate and an aluminum casting. Electron beam welding or laser welding is used as the joining means.

[0005]

FIG. 1 is a sectional view showing a gear according to an embodiment of the present invention in a half from a center line C. FIG. The gear generally denoted by reference numeral 1 has a small gear member 10 and a large gear member 20, and the small gear member 10 and the large gear member 20 are connected by a flange member 30. The small gear member 10 has a gear 12 and a boss 14. The large gear member 20 has a tooth portion 22 on the outer periphery, and the outer peripheral end 40 of the flange member 30 is overlapped and welded to the back side of the main body of the large gear member 20. As the welding means, electron beam welding or laser welding is used. The outer peripheral end portion 40 is formed by bending the flange member 30 so as to be parallel to the back surface of the large gear member 20, so that reliable welding is achieved.

Similarly, the inner peripheral member 42 of the flange member 30 is welded to the outer peripheral portion of the boss 14 of the small gear member 10.
The inner peripheral portion 42 is also bent so as to be parallel to the boss portion 14. The flange member 30 is manufactured by pressing a damping steel plate in which a resin material 34 is sandwiched between two steel plates 32.

FIG. 2 shows a welding structure between the outer peripheral portion 40 of the flange member 30 and the large gear member 20. Weld bead W _1, W ₂
Are formed on both side surfaces of the large gear member 20, but since there is no interference in this portion, no problem occurs.

FIG. 3 shows a welding structure between the inner peripheral portion 42 of the flange member 30 and the small gear member 10. The weld bead W ₃ is formed on the end face side of the boss portion 14. Since there is no interference in this part, no trouble occurs.

FIG. 4 is a sectional view showing another embodiment of the present invention. The gear of the present invention also has a small gear member 10 and a large gear member 20, both of which are connected by a flange member 130.
The flange member 130 is made of a material obtained by joining a steel plate 132 and an aluminum alloy or cast iron 134. Flange member 1
30 is welded to the inner periphery of the large gear member 20 at welds W ₁₁ and W ₁₂ . The welded portion is configured such that a steel plate 132 having good weldability comes into contact with the welded portion. The inner peripheral portion of the flange member 130 is welded by welds W ₁₃ on the outer periphery of the boss portion 14 of the pinion member 10.

FIGS. 5 and 6 are a sectional view and a side view showing still another embodiment of the present invention. This gear also has a large gear member 20 and a small gear member 10, both of which are connected by a flange member 230. The flange member 230 is made of a material obtained by casting a steel plate 232 into an aluminum alloy or cast iron 234. The outer peripheral portions of the large gear member 20 and the flange member 230 are joined at welded portions W ₂₁ and W _22. At this joint portion, a steel plate 232 having good weldability is directly brought into contact with the large gear member 20.

[0011] Similarly, the inner peripheral portion of the boss portion 14 and the flange member 230 of the pinion member 10 is joined at welds W _23.
At this joint, the steel plate 232 of the flange member is directly in contact with the flange 230. Also, the flange member 234
Is provided with a hole 236 on the circumference to reduce the weight. Through this hole, molten aluminum or cast iron can be circulated.

[0012]

As described above, according to the present invention, the vibration generated between the large gear member and the small gear member can be absorbed and suppressed by using the damping steel plate for the flange member. Further, by manufacturing the flange member with a joining member of a steel plate and an aluminum alloy casting or a cast iron, in the case of an aluminum alloy casting, weight reduction and improvement in rigidity can be achieved. In combination with cast iron, it is possible to manufacture a gear with good vibration isolation by utilizing the high vibration damping performance of cast iron.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a gear according to an embodiment of the present invention in half with respect to a center line.

FIG. 2 is a sectional view of a main part of FIG.

FIG. 3 is a sectional view of a main part of FIG. 1;

FIG. 4 is a cross-sectional view showing a gear according to another embodiment of the present invention, which is half the center line.

FIG. 5 is a cross-sectional view showing a gear according to another embodiment of the present invention half as centered.

FIG. 6 is a side view of FIG. 5;

[Explanation of symbols]

 Reference Signs List 1 gear 10 small gear member 12 tooth portion 14 boss portion 20 large gear member 22 tooth portion 30 flange member 32 steel plate 34 resin film for vibration damping 40 outer peripheral portion of flange member 42 inner peripheral portion of flange member W welded portion

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor, Asao Koike, 8 Dosana, Fujisawa-shi, Kanagawa Prefecture, Isuzu Central Research Institute Co., Ltd. Inside

Claims (6)

[Claims] An essentially metal gear in which a gear member and a flange member are separately formed, wherein the flange member is formed in a double structure by a combination of different materials, and is joined to the gear member. gear. 2. The gear according to claim 1, wherein the flange member is formed of a damping steel plate. 3. The gear according to claim 1, wherein the flange member is formed of a steel plate and cast iron. 4. The gear according to claim 1, wherein the flange member is formed of a steel plate and an aluminum casting. 5. An electron beam welding or a laser welding is used for joining the gear member and the flange member.
5. The gear according to any one of 5. 6. The gear according to claim 2, wherein one of two damping steel plates is joined to the boss portion of the small gear member and the other is joined to the large gear member.