WO2016029712A1

WO2016029712A1 - Clutch drum assembly manufacturing method

Info

Publication number: WO2016029712A1
Application number: PCT/CN2015/077909
Authority: WO
Inventors: 向井田秀则; 越后修二
Original assignee: 东莞一户五金电子有限公司
Priority date: 2014-08-28
Filing date: 2015-04-30
Publication date: 2016-03-03
Also published as: CN104625381B; JP6069270B2; CN104625381A; JP2016050588A

Abstract

A clutch drum assembly manufacturing method. The method is used for manufacturing a clutch drum assembly (1) provided with a clutch drum (2) for transmitting the power of an engine by means of a clutch apparatus and a power transmitting part (3) engaged onto a lateral part (21) of the clutch drum (2).A bulged melting-cladding part (32) is formed on at least one surface of the lateral part (21) and an end face part (31) of the power transmitting part (3) and is in a state of being clamped between the lateral part (21) and the end face part (31). The lateral part (21) and the end face part (31) are used for tightly pressing and welding the bulged melting-cladding part (32) in an electric resistance welding manner by means of electrodes (81 and 82). After that, a welding combination part is formed by the welded bulged melting-cladding part (32), so that the lateral part (21) and the end face part (31) are welded and combined. A low cost is ensured by means of high performance, light weight and reduction of manufacturing processes, and meanwhile, a good combination strength is also ensured.

Description

Clutch drum assembly manufacturing method

Technical field

The present invention relates to a method of manufacturing a clutch drum assembly, and more particularly to a method of manufacturing a clutch drum assembly that combines a side portion of a clutch drum with an end surface portion of a power transmitting member by resistance welding.

Background technique

In order to make the clutch drum assembly that is combined with the clutch drum of the centrifugal clutch and the clutch drum of the centrifugal clutch to be used under severe conditions such as a driving torque or a sudden change in load generated by the engine, it is necessary to ensure a very good bonding strength. Therefore, various welding methods such as brazing or electric resistance welding are known as a method of joining the sprocket and the clutch drum which constitute the clutch drum assembly (Examples: Patent Documents 1 and 2).

Prior technical literature:

Patent Document 1: Japanese Patent Publication No. 07-003252 (refer to paragraphs 0002 to 0011, Figs. 2, 4, and 8);

Patent Document 2: Japanese Patent No. 3790044 (refer to claim 1, paragraph 0015, and FIG. 3).

However, the method using brazing bonding described in Patent Document 1 is a process performed in a high-temperature furnace, so that decarburization or diffusion annealing occurs in the driven shaft, and the material structure of the clutch drum becomes brittle and softened. Therefore, the next heat treatment and grinding processing are required, resulting in an increase in the number of processing steps.

In the method of joining by electric resistance welding described in Patent Document 2, the projection formed by the first metal member (sprocket) is fitted into the notch portion formed by the second metal member, and the projection is completely attached. When it is joined to the notch portion, it is necessary to increase the processing of the projection portion and the notch portion, resulting in an increase in the number of processing steps.

technical problem

The present invention has been made in view of the above circumstances, and provides a method of manufacturing a clutch drum assembly that ensures high cost by high-performance, lightweight, and reduced manufacturing processes while ensuring excellent bonding strength.

Technical solution

In order to solve the above-described problems, a clutch drum assembly manufacturing method of the present invention is a clutch drum assembly manufacturing method having a clutch drum that transmits engine power through a clutch device and a power transmitting member that is coupled to a side portion of the clutch drum, The present invention is characterized in that a convex welded portion is formed on at least one surface of the clutch drum side surface portion and the end surface portion of the power transmitting member, and the convex welded portion is clamped to the side surface portion and the end surface In the state between the portions, the side portion and the end surface electrode are pressed while being welded, and the welded portion is welded to the welded joint portion formed by the welded convex portion. The side portion and the end surface portion are welded and joined.

In the method of manufacturing a clutch drum assembly according to the present invention, the convex welded portion formed on at least one of the side surface portion and the end surface portion is welded while being welded by electric resistance welding. Thereby, the side surface portion of the clutch drum and the end surface portion of the power transmission member are welded and joined by the welded joint portion formed on the welded welded portion. Therefore, the welded joint between the side portion of the clutch drum and the end surface portion of the power transmitting member is closely interposed with each other, so that a very good bonding strength can be ensured.

Therefore, the method for manufacturing a clutch drum assembly according to the present invention can be suitably applied as a combination means for a clutch drum and a power transmission member, so that the clutch drum assembly can be subjected to severe conditions such as a sudden change in driving torque or load generated by the engine. used.

Further, the method for manufacturing a clutch drum assembly according to the present invention is a very simple processing form in which at least one of the side surface portion and the end surface portion is formed with a convex welded portion, that is, it is not formed. In the notch portion, the projection portion is not melted and fitted into the notch portion, and excellent bonding strength can be ensured. Therefore, it is possible to effectively suppress an increase in the number of processing steps and manufacturing steps.

Thus, the manufacturing method of the clutch drum assembly according to the present invention can ensure a very good bonding strength while reducing the manufacturing process and reducing the cost.

According to a further improvement of the present invention, the clutch drum includes a through hole formed in a central portion of the side surface portion and a recess formed in an inner peripheral portion of the through hole. Further, the power transmission member includes a shaft inserted through the through hole formed in the end surface portion, and a riveted convex portion formed in the outer peripheral portion of the shaft and fitted into the concave portion and riveted together . Thereby, the concave portion and the caulking convex portion are mutually riveted, and the side surface portion and the end surface portion are joined together.

According to a desired configuration, the concave portion, for example, a power transmission member that forms a shape of the corresponding axial portion, and the concave portion and the rivet convex portion are riveted together so that the side portion and the portion The combination of the end faces allows for a stronger anti-rotation function for the clutch drum assembly. Therefore, it can be well applied under the condition that the driving torque of the engine is large or even more severe.

Further, a flange portion is formed in a perforated manner of a gear shape on the inner peripheral portion of the through hole.

According to the configuration, the inner peripheral portion of the through hole has a flange portion extending in the axial direction by a gear-shaped punching method, and the rigidity of the inner peripheral portion of the through hole can be improved. The torque in the direction of rotation can be transmitted more effectively.

Therefore, the present invention can be applied even under severe use conditions in which the driving torque of the engine is large. Further, the flange portion formed by the gear-shaped hole-punching method can improve the rigidity, and the thickness of the clutch drum can be made thinner to reduce the weight, and the manufacturing process can be further reduced than the manufacturing method using the cutting process.

In the above aspect, the power transmission member is a gear member formed by extending a plurality of tooth portions outward in a radial direction from the outer peripheral portion, and the convex welding portion is formed on the tooth portion. .

According to this configuration, the tooth portion of the gear member is used as the caulking convex portion, and the increase in the number of processing steps can be effectively suppressed.

According to another aspect of the present invention, a clutch drum assembly manufacturing method is a clutch drum assembly having a clutch drum that transmits engine power through a clutch device and a power transmitting member that engages a side portion of the clutch drum, It is a case that a convex portion is formed on at least one surface of the side surface portion of the clutch drum and the end surface portion of the power transmission member, and the convex portion is inserted into a through hole formed on the other surface. Riveting is performed such that the clutch drum and the power transmitting member are integrally joined together.

With such a configuration, a higher anti-rotation function can be ensured with a simple configuration, and the clutch drum and the power transmission member can be integrally combined.

Further, in the present specification, a power transmission member formed of a plurality of tooth portions such as a sprocket and a gear is collectively referred to as a gear member.

Beneficial effect

Advantageous Effects of Invention The method for manufacturing a clutch drum assembly according to the present invention achieves a reduction in manufacturing process and a reduction in cost while ensuring a very good bonding strength. Therefore, it can be suitably applied to a clutch drum assembly such as a chain saw which is used under severe use conditions such as a driving torque generated by an engine or a sudden change in load.

DRAWINGS

Fig. 1 is a perspective view showing the state in which the clutch drum assembly of the present invention is implemented.

Fig. 2 is a structural view of a clutch drum constituting a clutch drum assembly, wherein (a) is a front sectional view taken along line I-I and (b) is a right side view of the clutch drum.

Fig. 3 is a structural view of a sprocket constituting a clutch drum assembly, wherein (a) is a front sectional view taken along line II-II and (b) is a right side view of the sprocket.

Fig. 4 is a view showing a configuration state of a clutch drum assembly of the present invention, wherein (a) is a perspective view in an exploded state, and (b) is a front sectional view in an assembled state.

Figure 5 is a cross-sectional view showing a method of manufacturing the clutch drum assembly of the present invention, wherein (a) is a state in which an sprocket is attached to one side of the electrode, and (b) a clutch drum is assembled on the sprocket teeth and clamped by an electrode on the other side. The state (c) is a state in which the convex welded portion is welded by resistance welding.

Fig. 6 is a structural view of a clutch drum of a clutch drum assembly according to a first modified embodiment of the present invention, wherein (a) is a front cross-sectional view taken along line III-III and (b) is a right side view of the clutch drum.

Fig. 7 is a structural view of a sprocket of a clutch drum assembly according to a first modified embodiment of the present invention, wherein (a) is a front cross-sectional view taken along line IV-IV and (b) is a right side view of the sprocket.

Fig. 8 is a view showing a configuration of a clutch drum assembly according to a first modified embodiment of the present invention, wherein (a) is a perspective view in an exploded state, and (b) is a front sectional view in an assembled state.

Fig. 9 is a view showing a configuration of a clutch drum assembly according to a second modified embodiment of the present invention, wherein (a) is a perspective view in an exploded state, and (b) is a front sectional view in an assembled state.

Fig. 10 is a perspective view showing a modified embodiment of a sprocket of a clutch drum assembly according to an embodiment of the present invention, wherein (a) is a front cross-sectional view taken along line V-V, and (b) is a right side view of the sprocket.

Fig. 11 is a view showing a configuration of a clutch drum assembly according to a third modified embodiment of the present invention, wherein (a) is a perspective view in an exploded state, and (b) is a front sectional view in an assembled state.

Fig. 12 is a cross-sectional view showing a method of manufacturing a clutch drum assembly according to a third modified embodiment of the present invention, wherein (a) is a state in which a sprocket is attached to one side of a riveting jig, and (b) a clutch drum is attached to the clutch drum. On the sprocket, the other side of the rivet jig is clamped, and (c) is a state in which the convex portion is riveted.

Symbol Description:

1, 1A, 1B, 1C clutch drum assembly;

2, 2A, 2B, 2C clutch drum;

3, 3A, 3B, 3C sprocket (power transmission components);

12 clutch device;

21, 21A, 21B, 21C side parts;

21a convex melting portion;

21Ba anti-rotation hole;

23, 23A, 23B, 23C through the hole;

23a flange portion;

24 recesses;

31, 31A, 31B, 31C end face;

31a, 31aB internal convex part (BOSS part);

31b tying the convex portion;

32, 32C convex melting part;

32Ca protrusion (convex portion);

34 teeth;

81, 82 electrodes;

320 welded joints.

Embodiments of the invention

A method of manufacturing the clutch drum assembly 1 according to the present invention will be described in detail with reference to FIGS. 1 to 5 .

As shown in FIG. 1, the clutch drum assembly 1 includes a clutch drum 2 and a sprocket 3 integrally coupled to the clutch drum 2, the sprocket 3 serving as a power transmitting member for transmitting engine power. The clutch drum assembly 1 is a mounting member mounted on the upper surface of a chain saw or the like. The device transmits a driving force from the engine through the rotating shaft 11, and is transmitted from the clutch drum 2 to the sprocket 3 via a clutch device 12 such as a centrifugal clutch. The chain saw 13 is rotationally driven.

As shown in FIG. 5, the clutch drum assembly 1 according to the embodiment of the present invention is manufactured by welding the side surface portion 21 of the clutch drum 2 to the end surface portion 31 of the sprocket 3 to manufacture the clutch drum assembly 1.

Further, in the present embodiment, the gear member sprocket 3 formed by the plurality of tooth portions 34 as the power transmission member is described as an example, but is not limited thereto. The gear member can be applied similarly even if it is a gear such as a spur gear or a power transmission member is not a gear member or a pulley that transmits power by an annular transmission member such as a belt.

Clutch drum:

The clutch drum 2 is a member constituting a clutch device 11 (see FIG. 1) such as a clutch member. As shown in FIG. 2, the clutch drum 2 has a bottomed cup-like structure formed by, for example, press forming, and the bottom of the clutch drum 2 is formed with a side portion 21 which extends continuously from the side surface portion 21 in the axial direction to form a drum body. The drum portion constitutes an annular drum portion 22.

The clutch drum 2 is a clutch member (not shown) attached to the transmission shaft 11 of the engine (not shown), and is pressed against the inner peripheral portion of the drum portion 22 to transmit the driving force.

The side surface portion 21 has a through hole 23 formed in the center portion (axial portion), a concave portion 24 formed in the inner peripheral portion of the through hole 23, and a perforated portion formed on the inner peripheral portion of the through hole 23 Flange portion 23a. The through hole 23 and the recessed portion 24 can be simultaneously processed by, for example, press forming (punching processing).

The recessed portion 24 is formed to conform to the base end portion of the tooth portion 34 formed on the sprocket 3 to form a substantially trapezoidal shape. Eight points are equally divided along the circumferential direction. A flange portion 23a including a concave portion 24 over the entire circumference is formed on the inner peripheral portion of the through hole 23 (see FIG. 2(b)).

The flange portion 23a is formed to extend in the axial direction. After the punching process for forming the through hole 23 and the recessed portion 24, it can be formed by press forming and punching. The flange portion 23a is formed in the inner peripheral portion of the through hole 23 and the recessed portion 24, so that the rigidity of the recessed portion 24 is further improved, and the driving torque can be transmitted without fail.

The shape of the tooth portion 34 of the sprocket 3 is indicated by the two-point lock line (virtual) on Fig. 2(b). The shape of the recess 24 conforms to the shape of the base end portion of the tooth portion 34 of the sprocket 3, so that the bottom portion (base portion) of the tooth portion of the sprocket 3 can be fitted into the recess portion 24. (Refer to Figure 5(b)).

Further, in the present embodiment, the clutch drum 2 is manufactured by a press forming method. However, the present invention is not limited to this method, and may be produced by other methods such as cutting or forging.

Sprocket:

As shown in Fig. 3 (b), the sprocket 3 is formed by a plurality of tooth portions 23 (eight in the present embodiment and eight in the present embodiment) that are coupled to each other on the outer peripheral chain 13 (see Fig. 1). Gear parts. As shown in Fig. 3 (a), the sprocket 3 further includes a convex welded portion 32 formed on one end surface portion 31 (the end surface portion on the left side) and a shaft hole 33 into which a shaft (not shown) is inserted. .

The convex welded portion 32 is formed on the tip end portion of the tooth portion 34. In order to be able to protrude from the end surface of the tooth portion 34 in the axial direction, the shape is a slightly triangular pyramid shape in which the cross section is a straight triangle. When a large current flows out, the convex welding portion 32 is melted in a state of being clamped between the side surface portion 21 of the clutch drum 2 and the end surface portion 31 of the sprocket 3, so that the clutch is engaged. The side portions of the drum 2 are welded and joined to the end surface portion 31 of the sprocket 3.

Further, an inner convex portion (BOSS portion) 31a that protrudes in the axial direction is formed on the end surface portion 31 (end surface portion on the left side of the figure) of the sprocket 3 . When the inner convex portion (BOSS portion) 31a is inserted into the through hole 23 of the clutch drum 2 (see FIG. 5(b)), the side surface portion 21 of the clutch drum 2 and the end surface portion 31 of the sprocket 3 are integrated. integrate. (Refer to Figure 5(c)).

Therefore, in order to conform the outer peripheral portion of the inner convex portion (BOSS portion) 31a to the recessed portion 23 of the trapezoidal shape of the clutch drum 2, a fitting convex portion 31b having a trapezoidal shape conforming to the shape of the bottom portion of the tooth portion 34 is formed. .

Next, a method of manufacturing the clutch drum assembly 1 will be described with reference to FIGS. 4 and 5 .

The clutch drum assembly 1 is manufactured by clamping the convex welding portion 32 formed on the end surface portion 31 of the sprocket 3 between the side surface portion 21 of the clutch drum 2 and the end surface portion 31 of the sprocket 3. Then, by the resistance welding method such as spot welding and projection welding, the resistance heat generated by the large current flowing between the electrode 81 on one side and the electrode 82 on the other side brings the side surface portion 21 of the clutch drum 2 and the end surface portion 31 of the sprocket 3 Welding is combined.

As shown in Fig. 5(a), the electric stage 81 on one side is an electrode placed to position the sprocket, and is disposed below the figure. A member made of a ceramic material is embedded in the upper portion. The other electrode 82 is disposed above the figure as shown in Fig. 5(b). The electrode 81 on one side is clamped to the electrode 82 on the other side, and resistance welding is performed while pressing.

Positioning process:

Specifically, as shown in Fig. 5 (a), the inner convex portion (BOSS portion) of the sprocket 3 is placed in a state where the sprocket 3 is placed on the electrode 81 with the convex welding portion 32 facing upward on the one electrode 81. 31a and the through hole 23 of the clutch drum 2 are aligned with the axis for positioning. (Refer to Figure 4)

Welding bonding process:

As shown in Fig. 5(b), the clutch drum 2 is moved to the lower side of the figure, and the through hole 23 of the clutch drum 2 is fitted into the inner convex portion (BOSS portion) 31a of the sprocket 3. At this time, the concave portion 24 of the clutch drum 2 is fitted to the engaging convex portion 31b of the sprocket 3. The end surface portion 31 of the sprocket tooth 3 is formed such that the convex welding portion 32 is clamped between the side surface portion 21 of the clutch drum 2 and the end surface portion 31 of the sprocket 3, and the electric resistance welding operation is performed.

In the welding joining step, the side surface portion 21 of the clutch drum 2 and the end surface portion 31 of the sprocket 3 are sandwiched from the outer side by the electric stage 81 and the other side electrode 82, and the clutch drum is pressed while being pressed. The side surface portion 21 of the second surface portion 21 and the end surface portion 31 of the sprocket 3 are welded and joined.

As shown in FIG. 5(c), the clutch drum assembly 1 according to the embodiment of the present invention, the side surface portion 21 of the clutch drum 2 and the end surface portion 31 of the sprocket 3 are firmly welded and joined by the welded joint portion 320. The welded joint portion 320 welds the convex welded portion 32 by electric resistance welding, and the surface of the side surface portion 21 of the clutch drum 2 and the surface of the end surface portion 31 of the sprocket 3 when the convex welded portion 32 is welded The mixture is miscible to form a molten mixing portion in which the molecules are mixed with each other.

The method for manufacturing the clutch drum assembly 1 according to the embodiment of the present invention configured as described above achieves the following effects.

Since the welded joint portion 320 melts the convex molten portion 32 by electric resistance welding, and the surface of the side surface portion 21 of the clutch drum 2 and the surface of the end surface portion 31 of the sprocket 3 are fused to be melted and mixed while being pressed. And therefore has a very high bond strength.

Moreover, since the welded joint portion 320 is closely interposed between the side surface portion 21 of the clutch drum 2 and the end surface portion 31 of the sprocket 3 . Therefore, the volume of the convex melting portion 32 can be appropriately set, and the bonding area can be sufficiently ensured.

Therefore, the manufacturing method of the clutch drum assembly 1 can also be applied to a combination of the clutch drum 2 and the sprocket 3, such as a chain saw, which is used under severe conditions such as a driving torque generated by an engine such as a chain saw or a sudden change in load. .

Further, since a simple processing form in which the convex molten portion 32 is formed on the end surface portion 31 of the sprocket tooth 3 is employed, the processing step and the manufacturing process can be effectively prevented from increasing.

Next, in the present embodiment, the clutch drum 2 is formed by press molding or the like, and a convex melting portion is formed on the end surface portion 32 of the sprocket 3. However, the present invention is not limited thereto, and the convex melting portion may be formed on the side surface 21 of the clutch drum 2 even if it is not formed on the end surface portion 32 of the sprocket 3, and may be at the end surface portion 32 of the sprocket 3 and the clutch drum 2 The sides 21 are formed on both sides.

In addition, in this embodiment, Since the through hole 23 of the clutch drum 2 is fitted into the inner convex portion (BOSS portion) of the sprocket 3, the engaging convex portion 31b of the sprocket 3 and the concave portion 24 of the clutch drum 2 are fitted together, and in the clutch The flange portion 23a is formed on the inner peripheral portion of the drum 2 and the recess portion 24, so that a higher anti-rotation function can be added. However, the present invention is not limited thereto, and it is required to appropriately change the design according to the use conditions such as the driving torque acting on the clutch drum 2 and the power transmission member.

The following is a description of Modifications 1 to 3 of the clutch drum assembly 1 according to the embodiment of the present invention.

A modification 1 of the clutch drum assembly 1 according to the embodiment of the present invention will be described with reference to Figs. 6 to 8 . The clutch drum assembly 1A according to the first modification is different from the above-described embodiment in the following points. The clutch drum assembly 1 has a convex welded portion 32 formed on the end surface portion 31 of the sprocket 3, but is not provided with a convex welded portion on the sprocket tooth 3A, but is formed on the side surface portion 21A of the clutch drum 2A. The hemispherical convex welded portion 21a is not designed to be formed on the through hole 23A of the clutch drum 2A and the concave portion 24.

In the description of the clutch drum assembly 1A according to the first modification, the difference from the above-described clutch drum assembly 1 will be mainly described. The same components as those of the clutch drum assembly 1 will be denoted by the same reference numerals and will not be repeatedly described.

As shown in FIG. 6, the clutch drum 2A of the clutch drum assembly 1A includes a through hole 23A formed in a central portion (axial portion) of the side surface portion 21A, and a radially outward side of the through hole 23A. The semispherical convex welded portion 21a and the concave portion 24 formed on the inner peripheral portion of the through hole 23A.

The semispherical convex welded portion 21a protrudes in the direction of the end surface portion 31A of the sprocket 3A, and the upper side of the inner peripheral portion in the axial direction is not formed in a concave shape. The convex welded portion 21a corresponds to the convex welded portion 32 which is designed to the end surface portion 31 of the sprocket 3 in the above embodiment. It also has the same effect, so it will not be repeated.

Sprocket 3A as shown 7(a), although the inner convex portion (BOSS portion) 31a is formed on the end surface portion 31A, since the convex welded portion is not formed at the end surface end portion of the tooth portion 34, a flat surface is formed. Therefore, as shown in Fig. 8(b), the end surface end portion of the tooth portion 34 of the sprocket 3A is in a state of being attached to the hemispherical convex welded portion 21a formed on the side surface portion 21A of the clutch drum 2A, The hemispherical convex welded portion 21a is welded by electric resistance welding to form a welded joint portion (not shown) such that the side surface portion 31A of the sprocket 3A is welded and coupled to the side surface portion 21A of the clutch drum 2A. Further, the welded joint portion (not shown) formed by the welded hemispherical convex welded portion 21a has the same configuration as the welded joint portion 320 shown in Fig. 5(c), and therefore detailed description will be omitted. .

Next, a second modification of the clutch drum assembly 1 according to the embodiment of the present invention will be described with reference to FIG. The clutch drum assembly 1B according to the first modification is mainly different from the inner peripheral portion of the clutch drum 2 of the above-described embodiment and the inner convex portion (BOSS portion) 31a of the sprocket 3.

As shown in FIG. 9, the clutch drum 2B of the clutch drum assembly 1B has a shape in which the through hole 23B is formed in a circular shape, and is different from the clutch drum 2 (see FIG. 4) in which the recessed portion 24 is formed. In the sprocket 3, the inner convex portion (BOSS portion) 31a has an annular shape conforming to the through hole 23B, and this is formed on the outer peripheral portion of the inner convex portion (BOSS portion) 31a with the engaging convex portion 31b. The sprocket 3 (refer to FIG. 4) is different.

The manufacturing method of the clutch drum assembly 1B is the same as that of the clutch drum assembly 1, and therefore, the description thereof will not be repeated. Similarly, the convex melting portion 32 is melted by the electric resistance welding method, and the surface of the side surface portion 21B of the clutch drum 2B and the surface of the end surface portion 31B of the sprocket 3B are pressed and mixed to form a welded joint portion (not shown). ), and has a high bonding strength, can also play an anti-rotation function.

Therefore, the manufacturing method of the clutch drum assembly 1B can be suitably applied between a clutch drum 2B and a sprocket 3B such as a chain saw under severe use conditions such as a chain saw or the like, such as a driving torque or a sudden change in load generated by the engine. Combined means.

Although the embodiments and the modifications of the present invention have been described above, the present invention is not limited to the above-described embodiments, and may be implemented with appropriate modifications.

For example, in the convex-shaped melting portion 32 (see FIG. 3( a )) according to the above-described embodiment, in order to protrude from the end surface of the tooth portion 34 in the axial direction, a triangular pyramid having a right-angled triangular cross section is illustrated. shape. However, the present invention is not limited thereto, and as shown in FIG. 10(a), the illustrated cross section may be formed as a slightly triangular pyramid having an equilateral triangle. In short, it is necessary to appropriately set the shape of the convex molten portion, the shape of the power transmission member, the convenience of processing, and the form of the welded joint portion 320 (see FIG. 5(c)).

Third modification:

Further, in the method of manufacturing the clutch drum assembly 1 according to the above-described embodiment, the side surface portion 21 and the end surface portion 31 are pressed by the electric resistance welding method, and the protruding portion 32 is dissolved, and the inner peripheral surface of the protruding portion 32 and the clutch drum 2 are passed. The welded joint 320 (refer to FIG. 5(c)) is melted and bonded together. However, in the clutch drum assembly 1C according to the third modification, the side surface portion 21C and the end surface portion 31C are not melt-bonded by the welding joint portion 320 with reference to FIG. 5(c), but may be as shown in FIGS. 1 and 12. As shown in the figure, only the protruding portion 32Ca of the convex portion is caulked and fixed, and the clutch drum 2C and the sprocket 3C are integrally rotatable.

As shown in FIG. 11, the clutch drum assembly 1C includes a slightly triangular anti-rotation hole 21Ca formed on the side surface portion 21C of the clutch drum 2C, and a convex shape formed in the end surface portion of the sprocket 3 in conformity with the anti-rotation hole 21Ca. The section of the portion is a slightly triangular projection 32Ca.

In the method of manufacturing the clutch drum assembly 1C, the projection portion 32Ca having the convex portion is swaged, and the clutch drum 2C and the sprocket 3C are integrally rotatably fixed, and the projection 32Ca is fitted and tied to the prevention. In the turning hole 21Ca, the same anti-rotation function as that of the clutch drum assembly 1 (see Fig. 5(c)) can be added.

Further, in the third modification, the anti-rotation hole 21Ca is formed in the side surface portion 21C of the clutch drum 2C, and the front end portion of the convex melting portion 32C formed on the end surface portion 31C of the sprocket 3C is formed to conform to the anti-rotation hole. The cross section of 21Ca is a slightly triangular projection 32Ca. However, the shape of the projection 32Ca may be a circular cross section, or a projection may be formed on the side surface portion 21C of the clutch drum 2C (not shown). Further, an anti-rotation hole is formed at a different position from the convex melting portion 32 formed at the end surface portion of the sprocket 3.

The above is only a preferred embodiment of the present invention, and any minor modifications, equivalent changes and modifications of the above embodiments in accordance with the technical solutions of the present invention are within the scope of the technical solutions of the present invention.

Industrial applicability

The invention relates to a method for manufacturing a clutch drum assembly, which can reduce the manufacturing process and reduce the cost, and also ensures a very good bonding strength, and can be well applied to the demanding use of the driving torque or the sudden change of the load generated by the engine. Under the condition, the clutch drum assembly of the chain saw or the like is used. Therefore, it has industrial applicability.

Claims

A method of manufacturing a clutch drum assembly is a method of manufacturing a clutch drum assembly having a clutch drum that transmits engine power through a clutch device and a power transmitting member that is coupled to a side portion of the clutch drum, the special proof of which is that the clutch drum is And forming a convex welded portion on at least one surface of the side surface portion and the end surface portion of the power transmitting member, and clamping the convex welded portion between the side surface portion and the end surface portion The side surface portion and the electrode for the end surface portion are welded to the convex welding portion by a resistance welding method, and after welding, the convex welding portion forms a welded joint portion, and the side surface portion and the end surface portion are formed. Welding is combined.
The clutch drum assembly manufacturing method according to claim 1, wherein the clutch drum has a through hole formed in a center hole of the side surface portion and a recess formed in an inner peripheral portion of the through hole; The power transmission member includes an inner convex portion formed in the end surface portion and passing through the through hole, and a fitting convex portion formed in the outer peripheral portion of the inner convex portion and fitted into the concave portion; The concave portion and the engagement convex portion are welded and joined to the side surface portion and the end surface portion in a state of being engaged.
The clutch drum assembly manufacturing method according to claim 2, wherein the flange portion is formed by perforating at an inner peripheral portion of the through hole.
The clutch drum assembly manufacturing method according to any one of claims 1 to 3, wherein the power transmission member is a gear member formed by extending a plurality of tooth portions outward in a radial direction from the outer peripheral portion, and The convex weld portion is formed on the tooth portion.
A method of manufacturing a clutch drum assembly is a method of manufacturing a clutch drum assembly having a clutch drum that transmits engine power through a clutch device and a power transmitting member that is coupled to a side portion of the clutch drum, the special proof of which is that the clutch drum is The side surface portion and the end surface portion of the power transmission member are formed with a convex portion on at least one surface, and are inserted into a through hole formed on the other surface, and the convex portion is riveted to make the clutch The drum and the power transmitting member are integrally combined.