JP2001311436A - Tubular body, hub for clutch apparatus, and forming method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a forming method of a hub for a clutch apparatus preventing a breakage. SOLUTION: A cylindrical raw material is supported by pressing on both sides approximately at center points thereof in axial direction, and a first intermediary formed body is built by fluidizing an excessive metal at periphery thereof cylindrically along the identical axis. A second intermediary formed body is built by supporting pressingly the first intermediary formed body axially at blockage section which is closing the internal circumference of the cylindrical section and by shaping hub splines 3 through extrusion forming with an excessive metal being fluidized radially outwardly. The hub 1 is formed by punching out and removing the blockage plate which is closing the internal circumference of shell plate 2 where the hub splines 3 are protruding at the outer periphery of the second intermediary formed body. Because the hub splines 3 are being bulged by fluidizing the excessive metal from the cylindrical section, metal flow lines 34 for the shell plate and for the hub spline 3 run continuously, thereby increases the strength. Even in the clutch apparatus subjected to frequent heavy load, damage by breakage of the hub spline 3 can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylindrical body having a substantially cylindrical outer peripheral surface with a projection, a hub of a clutch device having a substantially cylindrical outer peripheral surface with a hub spline, and a molding method therefor. .

[0002]

2. Description of the Related Art Conventionally, as a cylindrical body having a projection on an outer peripheral surface, it has been used, for example, in a clutch disk device of an automobile.
There is known a hub 41 shown in FIG. 5 in which an annular fading is fitted to the center of a disk attached to both surfaces near the periphery and integrally assembled to constitute a clutch disk.

A hub 41 shown in FIG. 5 has a cylindrical body portion.
Hub splines 43, which are projections protruding in a wall shape along the circumferential direction, are provided on the outer peripheral surface of the circumferential direction at substantially equal intervals in the circumferential direction.
The hub 41 is formed by cutting the outer peripheral surface of a hollow cylindrical material (not shown).

[0004]

However, the hub 41 formed by cutting as shown in FIG. 5 is formed by cutting out the hub spline 43 by cutting.
The flow line 44 of the hub spline 43 is the body 42
Is cut off from the wire flow line 44 of FIG. For this reason, there is a problem that the hub spline 43 may be broken particularly when a load is applied to the hub spline 43 in a direction substantially along the axial direction of the body portion 42.

The present invention has been made in view of the above problems, and has as its object to provide a tubular body, a hub of a clutch device, and a method of forming the same, which prevent breakage.

[0006]

According to a first aspect of the present invention, there is provided a cylindrical body which is formed by forging a substantially cylindrical body and at least one of an inner peripheral surface and an outer peripheral surface of the body. And a formed protrusion.

A projection is formed by forging on at least one of the inner peripheral surface and the outer peripheral surface of the substantially cylindrical body, thereby forming a forging line (flow) between the body and the projection. line) is continuous, and the strength of the protrusion is increased to prevent breakage.

[0008] The hub of the clutch device according to the second aspect is a hub of the clutch device in which an annular fading is fitted integrally with a center of a disk attached to both surfaces near a peripheral edge to constitute a clutch disk. And a hub spline formed on the outer peripheral surface of the substantially cylindrical body by forging.

The hub spline is formed by forging on the outer peripheral surface of the substantially cylindrical body, so as to protrude.
The flow line between the body and the hub spline is continuous, and the strength of the hub spline, which is frequently subjected to a large load, increases, thereby preventing breakage.

According to a third aspect of the present invention, there is provided a clutch device having a clutch disk, wherein an annular fading is fitted integrally with a center of a disk attached to both surfaces near a peripheral edge to constitute a clutch disk. A molding method for molding a hub, in which substantially the center of both end faces in the axial direction of a substantially cylindrical material is pressed in the axial direction, and the peripheral edge is extruded backward into a coaxial cylindrical shape by excess flow. Forming a first intermediate molded body having a cylindrical portion and a closing portion for closing a substantially center of an inner peripheral surface of the cylindrical portion, and pressing and holding the closing portion of the first intermediate molded body along an axial direction. The excess spout flows radially outward to form the hub spline so as to protrude and protrude into the body, a closing plate that closes substantially the center of the inner peripheral surface of the body, and the outer peripheral surface of the body. 2nd with hub spline
Is formed, and the closing plate of the second intermediate formed body is removed by punching.

[0011] Then, substantially the center of both ends in the axial direction of the substantially cylindrical material is pressed in the axial direction, and the peripheral edge is extruded backward by a surplus flow into a coaxial cylindrical shape by the excess flow. A first intermediate molded body whose substantially center is closed by a closed part is formed, and the closed part of the first intermediate molded body is pressed and pressed in the axial direction and directed radially outward. The second intermediate molded body is molded by projecting the hub spline by flowing the excess
Since the closing plate that closes substantially the center of the body portion of the second intermediate body is removed by punching to form the hub of the clutch device, the forging line is formed on the outer peripheral surface of the cylindrical body portion only by forging. The flow spline is continuous and a high-strength hub spline is formed, and a hub that does not break the hub spline that is frequently subjected to a large load is easily formed.

According to a fourth aspect of the present invention, there is provided a clutch device having a clutch disk, wherein the annular fading is fitted integrally with a center of a disk attached to both surfaces near a peripheral edge to form a clutch disk. A molding method for molding a hub, in which both ends in the axial direction of a substantially cylindrical material are pressurized along the axial direction to allow the excess thickness to flow outward to a predetermined position on the outer peripheral surface, thereby forming a hub spline. It is to be protruded.

[0013] Since both ends of the substantially cylindrical material in the axial direction are pressurized along the axial direction, and the excess spout flows outward to form the hub spline at a predetermined position on the outer peripheral surface.
By simply forging by pressing along the axial direction, a forging flow line (flowline) is continuous on the outer peripheral surface of the cylindrical body, forming a high-strength hub spline. Not a hub is easily molded.

[0014]

An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a cylindrical hub.
The hub 1 is provided, for example, on a clutch disk of a clutch device.

The hub 1 has a substantially cylindrical body 2 on the inner peripheral surface of which a clutch shaft (not shown) is fitted. A plurality of hub splines 3, which are wall-shaped protrusions located at a substantially intermediate portion in the axial direction and are formed in the circumferential direction at substantially equal intervals in the circumferential direction, are provided on the outer peripheral surface of the body 2. And are formed integrally.

Next, a step of forming the hub 1 of the above embodiment will be described with reference to the drawings.

First, a substantially cylindrical raw material 11 shown in FIG. 2A, which is formed in a predetermined size in advance, is first forged with a first upper die and a first lower die (not shown). It is mounted on the processing device with the axial direction along the facing direction of the first upper mold and the first lower mold. Then, the first upper mold and the first lower mold are relatively moved in the facing direction, and pressure is applied as forging so as to sandwich the center of both end surfaces in the axial direction of the material 11 in the axial direction. By this pressurization, the peripheral edge of the raw material 11 is made to flow excessively, and the cylindrical cylindrical portion 12 is coaxially extruded rearward, and a substantially circular concave portion 13 is formed at both ends substantially in the center.
Is provided, and a hollow portion 1 is provided at substantially the center of the inner peripheral surface of the cylindrical portion 12.
FIG. 2 with an obstruction 14 located between 3 and 13
The first intermediate body 15 shown in (b) is formed by forging.

Next, the first intermediate compact 15 shown in FIG. 2B is converted into a second forging device 16 shown in FIGS.
And the second intermediate molded body 32 is forged. That is, the second forging device 16 is provided with the opposing second upper die 17.
And a second lower mold 18. And the second upper mold
Reference numeral 17 denotes an upper die holder 22 having an upper cylindrical hole 21 on the inner peripheral surface thereof having substantially the same diameter as the outer diameter of the body part 2 of the hub 1;
And a substantially rod-shaped upper die pressing pin 23 slidably fitted and held in the upper cylindrical hole 21. Also, the upper mold pressing pin 23
At the lower end surface of the upper end, a substantially cylindrical upper die pressing portion 24 having an outer diameter substantially equal to the inner diameter of the hub 1 is provided substantially at the center and protrudes downward substantially coaxially. The upper die pressing portion 24 has a protrusion from the base end to the front end that is 1/1 / the axial length of the hub 1.
2 and longer than the distance from one end of the first intermediate molded body 15 to the closing portion 14.

The second lower mold 18 is provided with a lower mold holding table 27 having an inner peripheral surface having a lower cylindrical hole 26 having substantially the same diameter as the outer diameter of the body 2 of the hub 1. A substantially rod-shaped lower pressing pin 28 is slidably fitted and held in the lower cylindrical hole 26 of the base 27. At the periphery of the lower cylindrical hole 26 of the lower holding table 27, a plurality of, for example, three fan-shaped meat relief steps 29 are provided at substantially equal intervals in the circumferential direction corresponding to the hub splines 3 of the hub 1. Have been. The flesh relief step 29 has a radial width dimension from the lower cylindrical hole 26 substantially equal to the projection dimension of the hub spline 3. Similarly to the upper die pressing pin 23 of the second upper die 17, the lower die pressing pin 28 has a substantially columnar shape having an outer diameter substantially equal to the inner diameter of the hub 1 and located at substantially the center of the upper end surface. The lower mold pressing portion 30 is provided substantially coaxially and protrudes upward. In addition, like the upper die pressing unit 24, the lower die pressing unit 30 has a protrusion from the base end to the distal end shorter than の of the axial length of the hub 1, and Is formed longer than the distance from one end of the intermediate molded body 15 to the closing portion 14.

Then, the first intermediate molded body 15 is inserted into the lower cylindrical hole 26 of the lower die holding table 27, and the lower die whose axial direction is the facing direction of the second upper die 17 and the second lower die 18. It is inserted and mounted along the axial direction of the cylindrical hole 26. Thereafter, the upper mold holding base 22 is lowered to bring the lower end surface into contact with the upper end surface of the lower mold holding base 27, and the lower mold pressing pin 28 is moved upward and the upper mold pressing pin 23 is moved.
Is moved downward, and the lower die pressing pin 28 and the upper die pressing pin 23
Is pressed so as to sandwich the first intermediate body 15. By this pressurization, the inner peripheral side of the cylindrical portion 12 is spread out on the peripheral surfaces of the upper pressurizing unit 24 and the lower pressurizing unit 30, and the closing unit 14 is closed by the upper pressurizing unit 24 and the lower pressurizing unit. As shown in FIG. 2, the end portion 30 is crushed, and the surplus portion flows to the meat escape step 29.
As shown in FIG. 3C and FIG. 3, the hub spline 3 protrudes from the outer peripheral surface of the body 2, and the closing plate 31, which is the closing portion 14 crushed substantially at the center of the inner peripheral surface of the body 2, is closed. The intermediate molded body 32 is molded. Then, the second upper mold 17 and the second lower mold 18 are relatively moved so as to be separated from each other, and the second intermediate molded body 32 is released from the mold.

Thereafter, the second intermediate molded body 32 is mounted on a third forging device (not shown), and the closing plate 31 of the body 2 is punched and removed to remove the hub 1 shown in FIGS. 1 and 2 (d). Is molded.

Here, the second intermediate formed body 32 obtained by the second forging device 16 has a hub spline 3 having a cylindrical portion 12.
As shown in FIG. 1, a flow line 34 between the body 2 and the hub spline 3 is continuous. Therefore, the hub spline is formed by the conventional cutting shown in FIG.
By forming 43, the strength is improved as compared with the structure in which the grain flow lines 44 are not continuous, and it is possible to prevent breakage even when stress is applied from the outside along the axial direction of the body portion 2.

As described above, according to the above-described embodiment, substantially the center of both ends in the axial direction of the substantially columnar material 11 is pressurized along the axial direction, and the periphery is coaxially formed by excess flow. The closed portion 14 of the first intermediate molded body 15 extruded backward into a cylindrical shape is pressurized and pinched along the axial direction to allow excess flow in the circumferential direction, and the hub spline 3 is attached to the outer peripheral surface of the body portion 2. The second intermediate molded body 32 is molded by projecting, and the closing plate 31 that closes substantially the center of the body portion 2 of the second intermediate molded body 32 is removed by punching to form the hub 1 of the clutch device. Therefore, the flow line 34 is continuously formed on the outer peripheral surface of the cylindrical body portion 2 only by forging, and the high-strength hub spline 3 is easily formed, and the hub spline 3 to which a large load is frequently applied is broken. The hub 1 of the clutch device that does not need to be formed can be easily formed.

Further, since only the forging process, which is easy to process, is used, the productivity is improved, and the body portion has a deformed cylindrical shape, such as a square tubular shape, an elliptic tubular shape, or a star tubular shape, which is difficult to machine. But it can be easily molded.

In the above embodiment, the hub 1 of the clutch device has been described. However, the hub 1 having the projection on the outer peripheral surface, the one having the projection on the inner peripheral surface, and the hub 1 having the outer peripheral surface and the inner peripheral surface respectively. It can be applied to a cylindrical object for any purpose, such as one having a projection. In the configuration in which the projection is provided on the inner peripheral surface, the substantially central portion of the closing plate 31 that closes the inner peripheral surface without projecting the hub spline 3 of the second intermediate molded body 32 of the above embodiment outward. It is sufficient to punch and remove only the protrusion so as to leave the protrusion.

Although molded from a solid cylindrical material 11, for example, a cylindrical material is pressurized so as to be crushed in the axial direction.
The hub spline 3 may be formed by flowing the excess thickness outward at a predetermined position on the outer peripheral surface. According to this configuration, the step of molding the first intermediate molded body 15 or the closing plate 31
There is no need for a step of punching and removing
The manufacturing process can be simplified and the manufacturability can be improved, and there is no weight change before and after the molding because punching and removal are not performed, and a predetermined characteristic in design can be easily obtained.

[0028]

According to the first aspect of the present invention, at least one of the inner peripheral surface and the outer peripheral surface of the substantially cylindrical body is formed with a projection by forging.
The flow line between the body and the projection is continuous, and the strength of the projection is increased, so that breakage can be prevented.

According to the hub of the clutch device of the second aspect, since the hub spline is projected and formed on the outer peripheral surface of the substantially cylindrical body by forging, the flow line between the body and the hub spline is formed. ) Is continuous, and the strength of the hub spline, which is frequently subjected to a large load, increases, thereby preventing breakage.

According to the method of forming a hub of a clutch device according to the third aspect, substantially the center of both end surfaces in the axial direction of the substantially cylindrical material is pressed along the axial direction, and the peripheral edge is caused to flow by excess flow. The closed portion of the first intermediate molded body formed by being extruded backward and coaxially into a cylindrical shape is pressurized and pinched along the axial direction, and the excess flow is made radially outward to form the hub spline. To form a second intermediate molded body, and to form a hub of the clutch device by punching out a closing plate that closes substantially the center of the body portion of the second intermediate formed body. A high-strength hub spline can be formed continuously with a flow line on the outer peripheral surface of the torso-shaped body portion, and a hub that does not break the hub spline of a clutch device that is frequently subjected to a large load can be easily formed.

According to the method of forming a hub of a clutch device according to the fourth aspect, both ends in the axial direction of the substantially cylindrical material are pressurized along the axial direction, and the excess flow is made outward and the outer peripheral surface is formed. A high-strength hub spline that has a flow line continuous with the outer peripheral surface of the cylindrical body only by forging by pressing along the axial direction to protrude and form the hub spline at a predetermined position. And a hub that does not break the hub spline of the clutch device that is frequently subjected to a large load can be easily formed.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view showing a hub of a clutch device according to an embodiment of the present invention.

FIG. 2 is an explanatory view showing a step of forming the hub. (A) Sectional view showing a material (b) Sectional view showing a first intermediate molded body (c) Sectional view showing a second intermediate molded body (d) Sectional view showing a hub

FIG. 3 is an explanatory view showing a situation in which a second intermediate molded body is formed by a second forging apparatus according to the first embodiment.

FIG. 4 is a plan view showing a second lower die of the second forging apparatus.

FIG. 5 is a partially cutaway perspective view showing a hub of a conventional clutch device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hub of a clutch device which is a cylindrical body 2 Body part 3 Hub spline which is a projection 11 Material 12 Cylindrical part 14 Closure part 15 First intermediate molded body 31 Closure plate 32 Second intermediate molded body

Claims (4)

[Claims] 1. A body comprising: a substantially cylindrical body; and a projection formed on at least one of an inner peripheral surface and an outer peripheral surface of the body by forging. Cylindrical body. 2. A hub of a clutch device, wherein an annular fading is fitted in the center of a disk attached to both surfaces near a peripheral edge and integrally assembled to form a clutch disk, comprising a substantially cylindrical body portion. A hub for a clutch device, comprising: a hub spline formed by forging on an outer peripheral surface of the body portion. 3. A molding method for molding a hub of a clutch device, wherein an annular fading is fitted in the center of a disk attached to both surfaces near a peripheral edge and integrally assembled to form a clutch disk, comprising a substantially circular shape. Approximately the center of both end surfaces in the axial direction of the columnar material is respectively pressed in the axial direction, and the peripheral edge is extruded rearward into a coaxial cylinder by excess flow to substantially extend the cylindrical portion and the inner peripheral surface of the cylindrical portion. Forming a first intermediate molded body having a closed portion that closes the center, pressurizing and clamping the closed portion of the first intermediate molded body along the axial direction, and making the excess radially outward. A second intermediate molded body having a body portion, a closing plate for closing a substantially center of an inner peripheral surface of the body portion, and a hub spline projecting on an outer peripheral surface of the body portion is formed by flowing and forming a hub spline so as to project. Molding, and punching out the closing plate of the second intermediate molded body A method for forming a hub of a clutch device, comprising: 4. A molding method for molding a hub of a clutch device, wherein an annular fading is fitted to a center of a disk attached to both surfaces near a peripheral edge and integrally assembled to form a clutch disk, comprising: A hub for a clutch device, characterized in that both end faces in the axial direction of a cylindrical material are pressurized along the axial direction to flow outwardly to a predetermined position on the outer peripheral surface to form a hub spline in a protruding manner. Molding method.