JP3666759B2 - Molding method of tripod type constant velocity joint outer ring - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improvement in the molding technology of a tripart type constant velocity joint outer ring .
[0002]
[Prior art]
FIG. 4 is a sectional view of a typical vehicle propulsion shaft. The propulsion shaft 100 is also called a propeller shaft. A relatively long intermediate shaft 101 has one end of a barfield type constant velocity ball joint 102 and the other end has a tripod type. This is a flexible shaft including a speed joint 120.
[0003]
In the bar field type constant velocity joint 102, a ball bearing-like ball 107 (... indicates a plurality. The same applies hereinafter) on an outer ring 104 in which a cup portion 105 and a shaft portion 106 are integrally formed. The retainer 108 and the inner ring 109 are accommodated. By attaching one end of the intermediate shaft 101 to the inner ring 109, torque can be transmitted even if there is a crossing angle between the intermediate shaft 101 and the shaft portion 106. This is a constant velocity universal joint. The balls 107 need to be lubricated with grease, and a bellows-type rubber cover 111 is attached in order to prevent grease from leaking and prevent foreign matters from entering. Reference numerals 112 and 113 denote mounting bands.
[0004]
The tripod type constant velocity joint 120 is provided with three grooves 124... On the inner surface of the outer ring 121 where the cup portion 122 and the shaft portion 123 are integrally molded, while the three legs (see FIG. 1 shows only one leg.) Each roller bearing 126 is attached, and the roller bearing 126 is slidably fitted in the groove 124. By attaching one end of the intermediate shaft 101 to the Y-shaped member 125, intermediate This is a shaft coupling in which the outer ring 121 is movable in the axial direction with respect to the shaft 101. Reference numeral 127 denotes a bellows type rubber cover, and 128 and 129 denote mounting bands.
[0005]
FIG. 5 is a perspective view of the outer ring of the tripod type constant velocity joint. The outer ring 121 is composed of the cup part 122 having the three grooves 124... And the shaft part 123 extending from the cup part 122 as described above. The cup portion 122 is literally a bottomed cylinder, and a portion near the bottom of the outer peripheral surface is a first outer peripheral surface 131, a portion near the opening is a second outer peripheral surface 132, and the first outer peripheral surface 131 is the second outer peripheral surface 132. It has a smaller diameter.
The reason why the first outer peripheral surface 131 has a small diameter is to reduce the weight of the outer ring 121.
[0006]
FIG. 6 is a perspective view of another tripod type constant velocity joint outer ring. A is attached to the reference numeral to distinguish it from FIG. 5, but the outer ring 121A has a cup portion 122A having three grooves 124A, The cup portion 122A includes a shaft portion 123A extending from the cup portion 122A. The cup portion 122A is a bottomed cylinder, and a portion near the bottom of the outer peripheral surface is a first outer peripheral surface 131A, and a portion near the opening is a second outer peripheral surface 132A. The first outer peripheral surface 131A is provided with a lightening groove 133A extending in the axial direction.
The lightening groove 133A is provided for the purpose of reducing the weight of the outer ring 121A.
[0007]
FIG. 7 is an explanatory view of ironing of a conventional tripod type constant velocity joint outer ring. An outer ring 121A whose shape is substantially adjusted in the forging process is set on the punch 135, and the ironing die 136 is slid from the top to the bottom on the outer ring 121A. The first outer peripheral surface 131A and the second outer peripheral surface 132A are ironed in this order.
Due to this ironing, a large diameter reducing force acts on the first and second outer peripheral surfaces 131A, 132A, and first, the inner peripheral surface (for convenience, it is divided into a first inner peripheral surface 141A and a second inner peripheral surface 142A). In contact with the punch 135, the dimensions of the inner peripheral surfaces 141A and 142A are defined, and subsequently the outer diameter dimensions of the first and second outer peripheral surfaces 131A and 132A are defined.
[0008]
[Problems to be solved by the invention]
FIG. 8 is a cross-sectional view of a main part of a conventional outer ring processed product. When the outer ring 121A after processing was examined, it was found that the diameter of the first inner peripheral surface 141A was larger than a specified value. Specifically, it was found that the first inner peripheral surface 141A is separated from the punch 135 by the gap δ.
This is because this portion is not squeezed by the squeezing die 136 due to the presence of the lightening groove 133A. Specifically, this is because the flow of meat accompanying plastic deformation is insufficient in this portion, and the meat is insufficiently filled.
A similar phenomenon occurs in the outer ring 121 described in FIG. That is, because the first outer peripheral surface 131 of the outer ring 121 has a small diameter, the ironing die 136 does not squeeze it.
Since the gap δ significantly reduces the dimensional accuracy of the outer rings 121 and 121A and degrades the quality of the product, countermeasures are highly desired.
[0009]
[Means for Solving the Problems]
In order to solve the above problems, the present inventors set the first outer peripheral surface as the first outer peripheral surface and the second outer peripheral surface near the opening of the bottomed cylinder and the outer peripheral surface as the second outer peripheral surface. 1 For a tripod type constant velocity joint outer ring provided with a hollow groove extending in the axial direction on the outer peripheral surface or a forged preform of a triport type constant velocity joint outer ring whose first outer peripheral surface is smaller in diameter than the second outer peripheral surface, A molding method of a tripod type constant velocity joint outer ring in which the first outer peripheral surface is formed by ironing with a first die and the second outer peripheral surface is formed with a second die, respectively. A supporting punch, a first ironing die for ironing the first outer peripheral surface of the outer ring, a first lifting ram for raising and lowering the first ironing die, and a second lifting and lowering arranged separately from the first lifting ram Ram and this second lifting ram from top to bottom The mounted in this order, using a molding apparatus comprising a second ironing die for squeezing the dispensing mechanism and the second outer peripheral surface for paying out the outer ring sets the outer ring to the punch supporting said outer ring, support Lowering the first lifting ram for raising and lowering the first ironing die to a certain position, and ironing the first outer peripheral surface of the outer ring with the first ironing die, and bringing the inner peripheral surface of the outer ring into close contact with the punch A step of reducing the diameter of the first outer peripheral surface, and then lowering the second lifting ram for raising and lowering the second ironing die while holding the first outer peripheral surface with the first ironing die, A step of ironing the second outer peripheral surface of the outer ring with a die to bring the inner peripheral surface of the outer ring into close contact with the punch and reducing the diameter of the second outer peripheral surface; 2 Outer ring with ironing die A step of withdrawing below,
Subsequently, the rod of the dispensing mechanism is advanced to the dispensing position, the first ram is raised and the outer ring is removed from the first ironing die, and then the second lifting ram is raised and the rod of the dispensing mechanism is moved to the outer ring. And scooping up the lower surface of the outer ring, removing the outer ring from the punch, and allowing the outer ring to be dispensed.
According to the first aspect, the first outer peripheral surface having a small diameter or a hollow groove is ironed by the first die, so that the inner peripheral surface of the outer ring can be satisfactorily adhered to the punch, and the generation of a gap can be prevented.
Further, when squeezing with the second die, meat tends to flow to the first outer peripheral surface, but this flow can be moderately suppressed, and finishing accuracy of the outer peripheral surface can be increased.
By the way, since the 1st ironing die and the 2nd ironing die were made mutually independent in shaping | molding, the said 1st outer peripheral surface which has a small diameter or a hollowing groove can be ironed with a 1st die | dye, and the inner peripheral surface of an outer ring | wheel Can be satisfactorily adhered to the punch.
[ 0010 ]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals. Moreover, the code | symbol used by description of the prior art is diverted to the outer ring | wheel as a workpiece | work.
FIG. 1 is a cross-sectional view of an essential part of a tripod type constant velocity joint outer ring molding device according to the present invention. The constant velocity joint outer ring molding device 1 is a punch fixed to a base 2 with a disk 3 and bolts 4. 5, an upper punch 6 disposed above the punch 5, a first ironing die 7 for ironing the first outer peripheral surface 131 of the outer ring 121 indicated by an imaginary line, and an elevator for raising and lowering the first ironing die 7 A first elevating ram 8; a second elevating ram 9 arranged so as to wrap the first elevating ram 8; a bracket 12 attached to the lower end of the second elevating ram 9 with bolts 11. The payout mechanism 13 attached to the lower part and the second ironing die 18 attached to the lower surface of the bracket 12 with bolts 17.
[ 0011 ]
The upper punch 6 is urged downward by an elastic means 10 such as a spring, and is a member that moves upward while maintaining a restraining action when receiving a pushing force exceeding a certain level.
In order to facilitate understanding, the drawing shows the first ironing die 7 and the second ironing die 18 separated vertically, and does not indicate a standby state. The description will be given with reference to FIG.
[ 0012 ]
The payout mechanism 13 includes a rod 14 and a cylinder 15 for taking the rod 14 into and out of the outer ring 121, and the rod 14 is in a standby position in the drawing.
[ 0013 ]
Next, the operation of the above-described tripport type constant velocity joint outer ring forming apparatus will be described.
FIGS. 2A to 2C are molding process diagrams of the tripart type constant velocity joint outer ring (first half).
In (a), first, the outer ring 121 is set on the punch 5.
In (b), the first elevating ram 8 and the second elevating ram 9 are simultaneously lowered to a certain position. First, the upper punch 6 contacts the upper surface of the outer ring 121 and presses the outer ring 121 against the punch 5. Subsequently, the first outer peripheral surface 131 of the outer ring 121 is ironed with the first ironing die 7. With this ironing process, the first inner peripheral surface 141 is in close contact with the punch 5 and the first outer peripheral surface 131 is reduced in diameter.
[ 0014 ]
In (c), the first outer peripheral surface 131 is held down by the first ironing die 7, and in this state, the second elevating ram 9 is lowered and the second outer peripheral surface 132 is ironed by the second ironing die 18. To do. Thus, the second inner peripheral surface 142 is in close contact with the punch 5 and the second outer peripheral surface 132 is reduced in diameter.
Since the first outer peripheral surface 131 remains suppressed by the first ironing die 7, it is possible to prevent the meat pressed during the ironing process by the second ironing die 18 from flowing to the first outer peripheral surface 131 and increase the diameter. There is no.
[ 0015 ]
FIGS. 3A to 3C are molding process diagrams (second half) of the tripod type constant velocity joint outer ring.
(A) shows a state in which the second ironing die 18 has been pulled out below the outer ring 121.
In (b), the cylinder 15 is extended to advance the rod 14 to the payout position.
Further, the first elevating ram 8 is raised. Then, the first ironing die 7 is detached from the outer ring 121. At this time, since the outer ring 121 is held by the upper punch 6, there is no fear that the outer ring 121 comes off the punch 5.
In (c), the second elevating ram 9 is raised. Then, the rods 14 and 14 scoop up the lower surface of the outer ring 121. Accordingly, the outer ring 121 can be disengaged from the punch 5 to the side.
2 and 3 are the same for the outer ring 121A, and thus the description thereof is omitted.
[ 0016 ]
In the first aspect of the present invention, the first ironing die 7 may wait upward immediately after rubbing the first outer peripheral surface 131.
Further, in the present invention, the processed product processed by forging is further formed by ironing with a die. Therefore, the processed product is described as a forged preform in the claims.
[ 0017 ]
【The invention's effect】
The present invention exhibits the following effects by the above configuration.
Te the claims 1 smell, bottom portion near the first outer peripheral surface of and the outer circumferential surface in a bottomed cylindrical, a portion of the opening near the second outer peripheral surface, a lightening groove extending in the axial direction to the first outer peripheral surface For a forged preform of a tripod type constant velocity joint outer ring or a tripart type constant velocity joint outer ring in which the first outer peripheral surface is smaller in diameter than the second outer peripheral surface, the first outer peripheral surface is a first die, 2. A method of forming a tripart type constant velocity joint outer ring, wherein the outer peripheral surface is formed by ironing each with a second die, wherein the punch is used to support the outer ring, and the first outer peripheral surface of the outer ring is formed. A first ironing die for ironing, a first lifting ram for raising and lowering the first ironing die, a second lifting ram arranged separately from the first lifting ram, and the second lifting ram from above to below To pay out the outer ring installed in this order And a step of setting and supporting the outer ring on a punch that supports the outer ring, and a method for raising and lowering the first ironing die. The first lifting ram is lowered to a certain position, the first outer peripheral surface of the outer ring is ironed with a first ironing die, the inner peripheral surface of the outer ring is brought into close contact with the punch, and the diameter of the first outer peripheral surface is reduced. Then, with the first outer peripheral surface held by the first ironing die, the second lifting ram for raising and lowering the second ironing die is lowered, and the second outer peripheral surface of the outer ring is ironed by the second ironing die. A step of closely contacting the inner peripheral surface of the outer ring with the punch and reducing the diameter of the second outer peripheral surface, and a step of lowering the second lifting ram and extracting the second ironing die below the outer ring, Then pay A step of advancing the rod of the lifting mechanism to the payout position, raising the first ram and removing the outer ring from the first ironing die, and subsequently raising the second lifting ram and moving the rod of the payout mechanism on the lower surface of the outer ring. Scooping up, removing the outer ring from the punch, and allowing the outer ring to be dispensed.
[ 0018 ]
Since the first outer peripheral surface having a small diameter or a hollowed-out groove is ironed with the first die, the inner peripheral surface of the outer ring can be satisfactorily adhered to the punch, and the generation of a gap can be prevented. When squeezing, the meat tends to flow to the first outer peripheral surface, but this flow can be moderately suppressed, and the finishing accuracy of the outer peripheral surface can be increased.
In the present invention, the first outer peripheral surface is kept suppressed by the first ironing die, and in this state, the second elevating ram is lowered and the second outer peripheral surface is ironed by the second ironing die. Since the peripheral surface is in close contact with the punch and the second outer peripheral surface is reduced in diameter and the first outer peripheral surface is held down by the first ironing die, the meat pressed during the ironing process by the second ironing die Can be prevented from flowing to the first outer peripheral surface, the diameter is not increased, and the finishing accuracy of the outer peripheral surface can be increased.
The present invention also provides a punch for supporting an outer ring, a first ironing die for ironing the first outer peripheral surface of the outer ring, a first lifting ram for raising and lowering the first ironing die, and the first lifting ram. A second lifting ram arranged separately, a payout mechanism for paying out the outer ring, and a second ironing die for squeezing the second outer peripheral surface, which are attached to the second lifting ram in this order from top to bottom. By using the molding device, the first ironing die and the second ironing die can be made independent of each other, and the first outer peripheral surface having a small diameter or a hollow groove can be ironed with the first die, and the inner peripheral surface of the outer ring can be improved. Can be closely attached to the punch.
[Brief description of the drawings]
[1] fragmentary cross-sectional view Figure 2 molding process diagram of the tripod type constant velocity universal joint outer ring of the molding apparatus of tripod constant-velocity joint outer ring according to the present invention (first half)
Fig. 3 Molding process diagram of tripod type constant velocity joint outer ring (second half)
[4] Typical cross-sectional view of a propulsion shaft vehicle 5 is a perspective view of tripod constant type perspective view of the outer ring of the constant velocity joint 6 another tripod constant type constant velocity joint outer race 7 of a conventional tripod constant Illustration of ironing process for outer ring of constant velocity joint of the mold [Fig. 8] Cross section of the main part of the processed outer ring of the conventional triport type constant velocity joint [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Triport type | mold constant velocity lu joint outer ring shaping | molding apparatus, 5 ... Punch, 7 ... 1st ironing die, 8 ... 1st raising / lowering ram, 9 ... 2nd raising / lowering ram, 13 ... Dispensing mechanism, 18 ... 2nd ironing die, 121, 121A ... outer ring, 131, 131A ... first outer peripheral surface, 132, 132A ... second outer peripheral surface, 133A ... thinning groove, 141, 141A ... first inner peripheral surface, 142, 142A ... second inner peripheral surface.

Claims (1)

A tripod type constant velocity joint having a bottomed cylinder and a portion near the bottom of the outer peripheral surface as a first outer peripheral surface and a portion near the opening as a second outer peripheral surface, and a hollow groove extending in the axial direction on the first outer peripheral surface. For a forged preform of an outer ring or a tripod type constant velocity joint outer ring having a smaller diameter than the second outer peripheral surface, the first outer peripheral surface is the first die and the second outer peripheral surface is the second outer peripheral surface. A method for forming a tripod type constant velocity joint outer ring which is formed by squeezing and forming each die with a die,
The punch for supporting the outer ring, the first ironing die for ironing the first outer peripheral surface of the outer ring, the first lifting ram for raising and lowering the first ironing die, and the first lifting ram are disposed separately from each other. A molding device comprising a second lifting ram, a dispensing mechanism for dispensing the outer ring, and a second ironing die for squeezing the second outer peripheral surface, which are attached to the second lifting ram in this order from top to bottom. Use
Setting and supporting the outer ring on the punch that supports the outer ring; and
The first lifting ram for raising and lowering the first ironing die is lowered to a certain position, the first outer peripheral surface of the outer ring is ironed with the first ironing die, the inner peripheral surface of the outer ring is brought into close contact with the punch, A step of reducing the diameter of the outer peripheral surface;
Next, while holding the first outer peripheral surface with the first ironing die, the second lifting ram for raising and lowering the second ironing die is lowered, and the second outer peripheral surface of the outer ring is ironed with the second ironing die, A step of bringing the inner peripheral surface of the outer ring into close contact with the punch and reducing the diameter of the second outer peripheral surface;
And then lowering the second lifting ram and extracting the second ironing die below the outer ring;
Subsequently, the rod of the dispensing mechanism is advanced to the dispensing position, the first ram is raised, and the outer ring is removed from the first ironing die,
Subsequently, raising the second elevating ram, scooping up the lower surface of the outer ring of the rod of the dispensing mechanism, removing the outer ring from the punch, and allowing the outer ring to be dispensed;
A molding method for a tripod type constant velocity joint outer ring, comprising:

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