阅读说明：本技术 摆动加工装置、轮毂单元轴承的制造方法及汽车的制造方法 (Swing machining device, method for manufacturing hub unit bearing, and method for manufacturing automobile ) 是由 丸野哲朗 菅井聪 山崎宽明 萩原信行 于 2019-02-25 设计创作，主要内容包括：设有：油盘(20),其具有在整周范围内与凹球面部(36)的外周缘相对的环状凹部(52)；和引导部件(21),其用于将从凸球面部(24)与凹球面部(36)的球面卡合部流出的润滑油朝向环状凹部(52)引导。(Is provided with: an oil pan (20) having an annular recessed portion (52) that faces the outer peripheral edge of the concave spherical portion (36) over the entire circumference thereof; and a guide member (21) for guiding the lubricating oil flowing out from the spherical engagement portion between the convex spherical surface portion (24) and the concave spherical surface portion (36) toward the annular recessed portion (52).)

1. A swing machining device is provided with:

a reference axis;

a support jig for supporting a workpiece so that a center axis of the workpiece and the reference axis are coaxial;

a spherical seat with shaft having a central axis inclined with respect to the reference axis, and having a machined portion formed at one end portion in the axial direction and a partially spherical convex spherical portion formed at an intermediate portion in the axial direction and directed toward the other end side in the axial direction;

a concave spherical seat having a through-hole through which the axial other end portion of the axial spherical seat is inserted, and a concave spherical surface portion engaged with the convex spherical surface portion;

an oil pan having an annular recessed portion opposed to an outer peripheral edge of the concave spherical portion over an entire circumference; and

and a guide member for guiding the lubricating oil flowing out from the spherical engagement portion between the convex spherical surface portion and the concave spherical surface portion toward the annular recessed portion, the guide member supporting the other end portion in the axial direction at one end side portion in the axial direction of the axial spherical seat.

2. An oscillating machining device according to claim 1,

the guide member is configured in a tubular shape, an outer peripheral surface of one axial side portion of a circumferential portion of the guide member slidably contacts the concave spherical surface portion, and one axial end edge of the remaining portion of the guide member faces an opening portion of the annular concave portion, or an axial intermediate portion to one end portion of the remaining portion of the guide member is disposed in the annular concave portion.

3. An oscillating machining device according to claim 1,

the guide member is formed in a tubular shape, and one axial side portion of the guide member hangs down.

4. An oscillating machining device according to claim 1,

the axial spherical seat has an end surface facing one end side in the axial direction,

the guide member includes: an annular seal portion supported and fixed to the end face; and a string-shaped or strip-shaped guide piece which is downward hung from a plurality of positions in the circumferential direction of the sealing part.

5. An oscillating working apparatus according to any one of claims 1 to 4,

an annular cover plate is supported and fixed to a radially inner side of the oil pan.

6. An oscillating working apparatus according to any one of claims 1 to 5,

the inclination angle of the central axis of the spherical seat with the shaft relative to the reference axis is more than 15 degrees.

7. An oscillating working apparatus according to any one of claims 1 to 6,

the spherical seat with shaft comprises a main body part, a base plate and a pressing die,

the body portion has the convex spherical surface portion and a central axis inclined with respect to the reference axis,

the base plate has a holding recess on a side surface on one end side in the axial direction and is fixed to the side surface on the one end side in the axial direction of the main body,

the die has a processed portion at one axial end portion, and the other axial end portion is fitted into the holding recess portion without play, whereby the die is fixed to the base plate while achieving radial positioning with respect to the base plate.

8. A method for manufacturing a hub unit bearing, the hub unit bearing comprising:

an outer ring having a plurality of rows of outer ring raceways on an inner circumferential surface thereof;

a hub having a plurality of inner ring raceways on an outer circumferential surface; and

a plurality of rolling elements arranged in each row between the plurality of rows of outer ring raceways and the plurality of rows of inner ring raceways and arranged to be rollable,

the hub is provided with an inner ring and a hub main body,

the inner ring has an axially inner one of the inner ring raceways on an outer circumferential surface,

the hub body has: the inner ring raceway on the axial outer side in the multiple rows of inner ring raceways is arranged on the outer peripheral surface of the axial middle part directly or through other parts; a fitting cylinder portion that is located axially inward of the axially outward inner ring raceway and that externally fits the inner ring; and a pressing portion that is bent radially outward from an axial inner end portion of the fitting cylinder portion and presses an axial inner end surface of the inner ring,

in the manufacturing method of the hub unit bearing,

the use of the oscillating machining device according to any one of claims 1 to 7, wherein the pressing portion is formed by plastically deforming a cylindrical portion provided at an axially inner end portion of the hub main body before the pressing portion is formed, radially outward.

9. A method of manufacturing an automobile having a hub unit bearing,

the hub unit bearing is manufactured by the method for manufacturing a hub unit bearing according to claim 8.

Technical Field

The present invention relates to an oscillating machining device that can be used to form a pressing portion formed by plastically deforming a cylindrical portion provided at an axial end of a shaft member radially outward, for example.

The application claims priority based on Japanese patent application No. 2018 & lt- & gt 032487 filed on 26.2.2018, Japanese patent application No. 2018 & lt- & gt 054018 filed on 22.3.3.2018 and Japanese patent application No. 2019 & lt- & gt 018458 filed on 5.2.2019, and the contents of the application are cited herein.

Background

The wheel of the automobile is rotatably supported by a hub unit bearing 100 as shown in fig. 7, for example, with respect to the suspension device.

The hub unit bearing 100 includes: an outer ring 102 which is coupled and fixed to a knuckle 101 constituting a suspension device so as not to rotate when in use; a hub 105 that supports and fixes a wheel 103 constituting a wheel and a braking rotor 104 such as a brake disc and a brake drum when in use, and rotates together with the wheel 103 and the braking rotor 104; and a plurality of rolling bodies 106.

The outer ring 102 includes a plurality of rows of outer ring raceways 107a and 107b and a stationary flange 108. The outer- ring raceways 107a and 107b are formed on the inner circumferential surface of the outer ring 102 in the middle portion in the axial direction. The stationary flange 108 is formed at an axial intermediate portion of the outer ring 102 so as to project radially outward, and has support holes 109 as screw holes at a plurality of locations in the circumferential direction. The outer ring 102 is coupled and fixed to the knuckle 101 by further fastening a bolt 111 inserted through a through hole 110 formed in the knuckle 101 by being screwed axially inward into a support hole 109 of the stationary flange 108.

The hub 105 is disposed coaxially with the outer ring 102 on the radially inner side of the outer ring 102, and includes a plurality of inner ring raceways 112a and 112b and a rotary flange 113. The inner- row raceway 112a and 112b are formed on the outer peripheral surface of the hub 105 at portions facing the outer- row raceway 107a and 107 b. The rotation flange 113 is formed on a portion of the hub 105 that is located axially outward of the axially outer end of the outer ring 102 so as to project radially outward, and has mounting holes 114 at a plurality of locations in the circumferential direction. The brake rotor 104 is coupled and fixed to the rotation flange 113 of the hub 105 by press-fitting the serration portion formed at the portion closer to the base end of the stud bolt 115 into the mounting hole 114 of the rotation flange 113 and press-fitting the intermediate portion of the stud bolt 115 into the through hole 116 formed in the brake rotor 104. Then, a nut 118 is screwed and tightened to the male screw portion formed at the tip end of the stud bolt 115 in a state where the male screw portion is inserted through a through hole 117 formed in the wheel 103, whereby the wheel is coupled and fixed to the rotary flange 113.

The rolling elements 106 are disposed in plural rows between the plural rows of outer ring raceways 107a and 107b and the plural rows of inner ring raceways 112a and 112b, respectively, and are disposed so as to be rollable in a state of being held by the cages 119, respectively.

In the illustrated example, the hub 105 is constructed by coupling and fixing a hub main body 120 having an axially outer (left side in fig. 7) inner ring raceway 112a and an inner ring 121 having an axially inner (right side in fig. 7) inner ring raceway 112b to each other. Specifically, the inner ring 121 is fitted to the outer surface of the hub main body 120 near the axially inner end, and the axially inner end surface of the inner ring 121 is pressed by a pressing portion 123 formed by plastically deforming the axially inner end of a cylindrical portion 122 provided at the axially inner end of the hub main body 120 radially outward, whereby the hub main body 120 and the inner ring 121 are fixed to each other.

When the axial inner end portion of the cylindrical portion 122 of the hub main body 120 is plastically deformed (pressed and expanded) radially outward to form the pressing portion 123, for example, a swing pressing device, which is one of swing working devices (swing rolling devices), can be used. Fig. 8 shows a swing pressing device 124 described in japanese patent application laid-open No. 2001-241450.

The swing pressing device 124 includes: a die 126 having a processed portion 125 at a tip end portion (lower end portion in fig. 8); and a holder 127 for supporting the hub main body 120 so that the center axis of the hub main body 120 is oriented in the vertical direction. When the axial inner end portion of the cylindrical portion 122 is pressed and expanded to form the pressing portion 123, the hub main body 120 is pressed upward via the holder 127, and the stamper 126 is rotated by the actuator in a swinging manner. That is, the stamper 126 is rotated about the central axis of the hub body 120 in a state where the central axis of the stamper 126 is inclined at a predetermined angle θ with respect to the central axis of the hub body 120. In other words, the center axis of the stamper 126 is oscillated around the center axis of the hub body 120 as a center axis trajectory by precession.

When the pressing portion 123 is formed by the swing pressing process using the swing pressing device 124, a part of the die 126 in the circumferential direction presses the axial inner end portion of the cylindrical portion 9, and the processing operation for the pressing portion 123 is performed continuously in the circumferential direction and locally. Therefore, according to the swing pressing process, the load required for the process can be reduced as compared with the case where the pressing portion 123 is formed by the normal forging press.

Disclosure of Invention

However, in the oscillating pressing device 124 as described above, a large processing reaction force is applied to the die 126 in the axial direction during the processing of the pressing portion 123. In contrast, japanese patent application laid-open No. 2013-132678 discloses a structure of an oscillating rolling apparatus: although not intended to form a pressing portion at the axial inner end portion of the hub body of the hub unit bearing, the machining reaction force applied to the press mold (upper mold) during the rolling can be supported by the spherical engagement of the partially convex spherical surface portion (hemispherical portion) and the partially concave spherical surface portion (receiving surface).

In the oscillating press device described in japanese patent application laid-open No. 2013-132678, the center axis of the stamper is inclined at a predetermined angle with respect to the center axis of the concave spherical portion, so that a part of the concave spherical portion is exposed from the convex spherical portion. Therefore, the lubricating oil which forcibly lubricates the spherical engaging portion and flows (seeps) radially outward from the spherical engaging portion may drip from the concave spherical surface portion, and adversely affect the peripheral environment of the workpiece.

Further, international publication No. 2004/001247 describes the following swing pressing device: in the machining of the pressing portion, the outer ring is rotated and the rolling elements are rotated and revolved, whereby the formation of indentations in the inner ring raceway and the outer ring raceway can be prevented.

The present invention has an object to realize a structure of a swing machining apparatus which can prevent a lubricating oil flowing out from a spherical surface engagement portion between a convex spherical surface portion and a concave spherical surface portion from exerting an adverse effect on the peripheral environment of a workpiece, for example, and can reduce the effect on the peripheral environment, and is advantageous for appropriate environmental protection against a swing motion.

In one aspect of the present invention, a swing machining apparatus includes a reference shaft, a support jig, a spherical seat with a shaft, a concave spherical seat, an oil pan, and a guide member. The support jig is configured to support the workpiece so that a central axis of the workpiece and the reference axis are coaxial. The axial spherical seat has a central axis inclined with respect to the reference axis, and has a machined portion formed at one end portion in the axial direction, and a partially spherical convex spherical portion formed at an intermediate portion in the axial direction and directed toward the other end side in the axial direction. The concave spherical seat has a through-hole through which the other axial end portion of the axial spherical seat (the portion of the axial spherical seat located on the other axial end side of the convex spherical portion) is inserted, and a concave spherical portion that is spherically engaged with the convex spherical portion. The oil pan has an annular recess portion facing the outer peripheral edge of the concave spherical portion over the entire circumference. The guide member supports the other end portion (base end portion) in the axial direction at one end side portion in the axial direction of the spherical seat with shaft, and guides the lubricating oil flowing out from the spherical engagement portion between the convex spherical surface portion and the concave spherical surface portion toward the annular recessed portion.

In one aspect of the present invention, a hub unit bearing that is a target of a method for manufacturing a hub unit bearing includes: an outer ring having a plurality of rows of outer ring raceways on an inner circumferential surface thereof; a hub having a plurality of inner ring raceways on an outer circumferential surface; and rolling elements arranged in a plurality of rows between the outer ring raceways and the inner ring raceways, and arranged to be rollable. The hub includes an inner ring and a hub body. The inner ring has an axially inner one of the inner ring raceways on an outer circumferential surface. The hub body has: an axially outer inner ring raceway of the plurality of rows of inner ring raceways provided on an outer peripheral surface of an axially intermediate portion directly or via another member; a fitting cylinder portion that is located axially inward of the axially outward inner ring raceway and that is fitted to the outer ring; and a pressing portion that is bent radially outward from an axial inner end portion of the fitting cylinder portion and presses an axial inner end surface of the inner ring.

In the method of manufacturing a hub unit bearing according to one aspect of the present invention, the pressing portion is formed by plastically deforming a cylindrical portion provided at an axially inner end portion of the hub main body before the pressing portion is formed, radially outward, using the oscillation processing apparatus as described above.

In one aspect of the present invention, an automobile to be subjected to a method for manufacturing an automobile includes a hub unit bearing. In this method of manufacturing an automobile, the hub unit bearing is manufactured by the method of manufacturing a hub unit bearing as described above.

Effects of the invention

According to the oscillation processing apparatus of the present invention as described above, for example, the lubricant oil flowing out from the spherical surface engagement portion between the convex spherical surface portion and the concave spherical surface portion can be prevented from adversely affecting the peripheral environment of the workpiece, and the influence on the peripheral environment can be reduced. In addition, the swing processing apparatus of the present invention is advantageous for proper environmental protection against the swing motion.

Drawings

Fig. 1 is a schematic cross-sectional view showing a swing machining apparatus (swing rolling apparatus) according to example 1 of the embodiment of the present invention.

Fig. 2 is an enlarged sectional view of a main portion of fig. 1.

Fig. 3 is a cross-sectional view showing another example of the coupling structure between the base plate and the stamper.

Fig. 4 is a view similar to fig. 2 showing two other examples of the shape of the guide member.

Fig. 5 is an enlarged sectional view of a main part of an oscillating working machine (oscillating rolling machine) according to example 2 of the embodiment of the present invention.

Fig. 6 is an enlarged sectional view of a main part of an oscillating working machine (oscillating rolling machine) according to example 3 of the embodiment of the present invention.

Fig. 7 is a cross-sectional view showing an example of a conventional rolling bearing unit for wheel support.

Fig. 8 is a cross-sectional view showing an example of a conventional structure of a rolling machine (rolling machine).

Detailed Description

[ 1 st example of embodiment ]

Fig. 1 and 2 show example 1 of the embodiment of the present invention. The oscillation pressing device 15 of this example is an oscillation rolling device for performing oscillation pressing for plastically deforming (pressing and expanding) an axially inner end portion of the cylindrical portion 9 of the hub main body 7a so as to be crushed outward in the axial direction and to be pressed and expanded outward in the radial direction to form the pressing portion 10.

In this example, the hub 3a of the hub unit bearing 1a as the work is configured such that the pair of inner rings 8a and 8b are fitted around the outer peripheral surface of the axially intermediate portion of the hub main body 7a, and the axially inner end surface of the axially inner ring 8b is pressed by the pressing portion 10 formed by plastically deforming the axially inner end portion of the cylindrical portion 9a provided at the axially inner end portion of the hub main body 7a radially outward, thereby configuring the hub 3a of the hub unit bearing 1 a. However, the hub unit bearing 1a to be the subject of this example may be configured by a hub main body having one inner ring and an outer ring raceway on an outer peripheral surface at an axially intermediate portion, as in the hub unit bearing 100 shown in fig. 7.

In the hub unit bearing 1a, tapered rollers are used as the rolling elements 6a, but balls may be used as in the hub unit bearing 100 shown in fig. 7.

Note that, the axially inner side of the hub unit bearing 1a refers to the widthwise central side of the vehicle in a state in which the hub unit bearing 1a is assembled in the suspension device, and conversely, the widthwise outer side of the vehicle in a state in which the hub unit bearing 1a is assembled in the suspension device is referred to as the axially outer side.

The rolling device 15 of this example includes: a frame 16 which is placed on the ground of a factory or the like and does not move during the operation of the rolling device 15, a support jig (support body) 17, a spherical bearing seat (oscillating body) 18 with a shaft, a concave spherical seat 19, a drive mechanism 38, an outer ring rotation mechanism 43, an oil pan 20, a guide member 21, and a cover ring (cover plate) 50. The oscillating roller 15 has a reference axis C serving as a machining reference. In this example, the reference axis C is oriented in the vertical direction and is disposed in the center of the rolling device 15.

The support jig 17 supports the hub unit bearing (workpiece )1a so that the center axis of the hub unit bearing 1a is coaxial with the reference axis C, and so that the axial outer end of the hub unit bearing 1a faces downward and the axial inner end of the hub unit bearing 1a faces upward. That is, the support jig 17 has a support recess 22 on the upper surface that can engage (fit) with the axial outer end of the hub main body 7a without radial play. The support jig 17 is supported at a lower portion in the frame 16 by an upper end portion of an elevating table 23 provided to be capable of elevating along the reference axis C.

The spherical seat 18 has a central axis O inclined with respect to the reference axis C₁₈The tool has a machined portion 12a formed at one axial end (lower end in fig. 1 and 2) and a partially spherical convex spherical portion 24 formed at an axial intermediate portion and facing the other axial end (upper side in fig. 1 and 2). The spherical seat with shaft (oscillating body) 18 is disposed opposite to the surface of the support jig 17 intersecting with the predetermined axis, and oscillates with respect to the workpiece (workpiece) 1 a. The prescribed axis is, for example, the reference axis C.

Further, with respect to the coaxial spherical seat 18, one end side in the axial direction is a side where the tip end portion of the processed portion 12a is formed, and is a lower side in fig. 1 and 2, and the other end side in the axial direction is a side opposite to the tip end portion where the processed portion 12a is formed, and is an upper side in fig. 1 and 2.

Central axis O of axial spherical seat 18₁₈The inclination angle θ with respect to the reference axis C is preferably 15 degrees or more and 45 degrees or less, more preferably 15 degrees or more and 30 degrees or less, and further preferably 15 degrees or more and 18 degrees or less. For example, the tilt angle θ can be 5, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, or 45 degrees. In this example, the inclination angle θ is set to 15 degrees. By setting the inclination angle θ to 15 degrees or more, the force in the direction of crushing the cylindrical portion 9 outward in the axial direction and the force in the direction of expanding the cylindrical portion 9 outward in the radial direction can be adjusted to appropriate levels, and the surface roughness of the portion of the outer peripheral surface of the cylindrical portion 9 that abuts (fits) the inner peripheral surface of the inner ring 8b can be improved, and the durability of the hub unit bearing 1a can be improved. In addition, if the inclination angle θ is 30 degrees or less, when the pressing portion 10 is formed by the swing pressing process, the amount of wear of the pressing portion 10 can be suppressed to a small amount, and the durability of the hub unit bearing 1a can be improved. The inclination angle θ can be set to less than 15 degrees or more than 45 degrees. In the case of manufacturing the hub unit bearing 1a using the rolling machine according to the present invention, it is preferable to structurally set the inclination angle θ to 15 degrees or more and 18 degrees or less.

In this example, the spherical seat with shaft (oscillating body) 18 is constituted by combining the shaft main body 25, the spherical convex seat 26, the base plate 27, and the stamper (pressing tool) 13 a.

The shaft body 25 includes a shaft portion 28, a flange portion 29 protruding radially outward from the outer peripheral surface of one end portion in the axial direction of the shaft portion 28, and a 1 st positioning recess portion 30 formed in the center portion of one end surface in the axial direction.

The convex spherical seat 26 includes a convex spherical portion 24 formed on the side surface on the other end side in the axial direction, a fitting concave portion 31 formed on the side surface on one end side in the axial direction, and a through hole 32. The fitting recess 31 can fit the flange 29 of the shaft main body 25 without radial play. The through hole 32 is formed to penetrate the center portion of the spherical boss 26 in the axial direction, and is configured to allow an axial intermediate portion (a portion adjacent to the other axial end side of the portion where the flange portion 29 is formed) of the shaft portion 28 of the shaft main body 25 to pass therethrough without play in the radial direction.

The base plate 27 has a 1 st positioning convex portion 33 formed on the side surface on the other end side in the axial direction and capable of fitting with the 1 st positioning concave portion 30 of the shaft main body 25 without radial play, and a 2 nd positioning convex portion 34 formed on the side surface on one end side in the axial direction.

The stamper (pressing tool, swinging member) 13a has a processing portion 12a formed at one end in the axial direction, and a 2 nd positioning concave portion 64 formed on a side surface at the other end in the axial direction and capable of fitting with the 2 nd positioning convex portion 34 of the base plate 27 without radial play. That is, the machined portion 12a is configured by forming a conical protruding portion 53 in the side surface center portion on one end side in the axial direction of the stamper 13a, and forming a recessed groove 54 having an arc-shaped cross section around the protruding portion 53 so as to surround the entire circumference of the protruding portion 53. The stamper (pressing tool, swinging body) 13a is disposed so as to face the surface of the support jig 17 intersecting with the predetermined axis, and swings with respect to the workpiece (workpiece) 1 a.

The shaft body 25 and the spherical convex surface seat 26 are assembled by inserting or pressing the axial intermediate portion of the shaft portion 28 into the through hole 32 without radial play and fitting the flange portion 29 into the fitting recess 31 without radial play. The base plate 27 and the die (pressing tool) 13a are coupled and fixed by fitting the 2 nd positioning convex portion 34 of the base plate 27 into the 2 nd positioning concave portion 64 of the die 13a without radial play, and by screwing a bolt inserted from a circular hole formed in the die 13a into a screw hole formed in the base plate 27. In this example, the assembly of the shaft main body 25 and the spherical convex surface seat 26 as the main body portion and the assembly of the base plate 27 and the stamper 13a are engaged with the 1 st positioning concave portion 30 and the 1 st positioning convex portion 33 in a concave-convex manner and are joined by a joining member such as a bolt, thereby forming the spherical seat with shaft 18.

However, as shown in fig. 5, the base plate 27a and the die (pressing tool) 13b may be fixed by fitting the base end portion (the other end portion in the axial direction; the upper end portion in fig. 5) of the die 13b into a holding recess 67 formed in the side surface of the base plate 27a on the one end side in the axial direction without play, and screwing a bolt inserted from a circular hole formed in the die 13b into a screw hole formed in the base plate 27 a. The method of fastening the shaft main body 25, the spherical convex seat 26, the base plates 27, 27a, and the dies 13a, 13b is not limited to the method using bolts, and may be fastened by press fitting, snap ring, or the like. Further, a part of the shaft main body 25, the spherical convex surface seat 26, the base plate 27, and the die 13a may be integrally formed, and/or the spherical seat with shaft 18 may be integrally formed.

The concave spherical seat 19 includes: a through-hole 35 for inserting an axial intermediate portion of the belt-fitted spherical seat 18 (a portion of the shaft portion 28 of the shaft main body 25 that protrudes from the convex spherical surface portion 24 of the convex spherical seat 26 toward the other axial end side); and a concave spherical surface portion 36 of a partial spherical shape which is engaged with the convex spherical surface portion 24 of the axial spherical seat 18. In this example, the concave spherical seat 19 is supported and fixed to an intermediate portion in the vertical direction in the frame 16.

In this example, by spherical engagement of the convex spherical surface portion 24 of the belt-axis spherical seat 18 and the concave spherical surface portion 36 of the concave spherical seat 19, the belt-axis spherical seat 18 is allowed to perform a swinging motion (swinging rotation, revolution) about the reference axis C and the belt-axis spherical seat 18 is allowed to perform a central axis O thereof₁₈The attitude change (rotation motion, rotation) is performed as a center, and the machining reaction force applied to the pivot spherical seat 18 can be supported when the rocking rolling is performed. During the operation of the rolling apparatus 15, that is, while the pivoted spherical seat 18 is being swung about the reference axis C by the drive mechanism 38, which will be described later, the spherical engagement portion between the convex spherical surface portion 24 and the concave spherical surface portion 36 is forcibly lubricated by the lubricating oil discharged from the plurality of discharge port nozzles formed in the concave spherical surface portion 36.

In this example, the insertion hole 35 of the concave spherical seat 19 is a tapered hole having an inner diameter that increases as it goes upward. Further, a portion of the frame 16 adjacent to the upper side of the insertion hole 35 of the concave spherical seat 19 and through which the axially intermediate portion of the axial spherical seat 18 is inserted is a stepped hole 37 having an inner diameter that increases stepwise upward. The inner diameter of the insertion hole 35 and the stepped hole 37 is limited so that the inner circumferential surfaces of the insertion hole 35 and the stepped hole 37 do not interfere with the outer circumferential surface of the axial spherical seat 18 when the axial spherical seat 18 swings about the reference axis C.

In this example, the stepped hole 37 is provided in the frame 16 adjacent to the upper side of the insertion hole 35 of the concave spherical seat 19 for easy processing. In the case of implementing the present invention, a portion of the frame 16 adjacent to the upper side of the insertion hole 35 of the concave spherical seat 19 may be a tapered hole having an inner diameter dimension that increases as it goes upward.

The drive mechanism 38 is configured to apply a driving force to the other end portion in the axial direction of the coaxial spherical seat 18, the driving force being configured to swing and rotate the coaxial spherical seat 18 about the reference axis C. The drive mechanism 38 is supported and fixed at an upper end portion in the housing 16, and is coupled to the other end portion in the axial direction of the shaft portion 28 of the shaft main body 25 of the pivot spherical seat 18, which protrudes upward from the stepped hole 37, so as to be able to apply a driving force.

The drive mechanism 38 includes a rotating body 39 and a bearing 40. The rotating body 39 is supported by an upper end portion in the frame 16 via a bearing device 41 so as to be rotatable about the reference axis C only. The rotating body 39 has a holding hole 42 inclined in a direction to be radially outward as it goes upward at one circumferential position in the radially intermediate portion. The inclination angle of the central axis of the holding hole 42 with respect to the reference axis C and the central axis O of the axial spherical seat 18₁₈The inclination angle θ with respect to the reference axis C is the same. An output portion of a motor (not shown) for rotationally driving the rotating body 39 about the reference axis C is connected to the rotating body 39 directly or via a reduction gear.

The bearing 40 is provided between the inner peripheral surface of the holding hole 42 and the outer peripheral surface of the other end portion in the axial direction of the shaft-including spherical seat 18, and rotatably supports the other end portion in the axial direction of the shaft-including spherical seat 18 with respect to the holding hole 42. In this example, a self-aligning roller bearing is used as the bearing 40. Instead, if the radial load and the axial load can be supported, a rolling bearing such as a deep groove ball bearing or an angular ball bearing can be used.

The outer ring rotation mechanism 43 is for rotating and revolving the rolling elements 6a by rotating and driving the outer ring 2a of the hub unit bearing 1a, and preventing the indentations from being formed in the outer ring raceways 4c, 4d and the inner ring raceways 5c, 5d as the pressure parts 10 are formed. The outer ring rotating mechanism 43 includes an electric motor, not shown, a drive ring 44 that is rotationally driven by the electric motor, and a drive jig 45 that is supported so as to be able to slightly move up and down with respect to the drive ring 44 and to be able to rotate in synchronization with the drive ring 44. Specifically, in the illustrated example, the drive ring 44 and the drive jig 45 are combined via the ball spline 48. An inward flange 65 protruding radially inward is provided at the upper end of the drive ring 44, and a torsion coil spring 66 is sandwiched between the lower surface of the inward flange 65 and the upper end surface of the drive jig 45. According to such a configuration, the lower end portion of the driving jig 45 can be coupled to the coupling flange 46 of the outer ring 2a by supporting the driving jig 45 so as to be vertically displaceable with respect to the drive ring 44. The outer ring rotating mechanism 43 is configured to be capable of rotationally driving the outer ring 2a by rotationally driving a driving jig 45 engaged with a coupling flange 46 of the outer ring 2a via a driving ring 44 by an electric motor. The drive ring 44 is rotatably supported with respect to the frame 16 via a radial bearing 47, a guide ring 49 having an L-shaped cross section and an annular shape as a whole, and the oil pan 20. However, the outer ring rotation mechanism 43 is not limited to the above configuration, and various configurations can be adopted as long as the rolling elements 6a can be rotated and revolved by rotationally driving the outer ring 2 a.

The oil pan 20 is formed in a substantially L-shaped cross section, and includes a cylindrical portion 62 supported and fixed around the other end portion (lower end portion) in the axial direction of the concave spherical seat 19, and an annular portion 63 bent radially inward from the lower end portion of the cylindrical portion 62. The annular portion 63 has, on the upper surface, an annular recessed portion 52 opposed to the outer peripheral edge of the concave spherical surface portion 36 of the concave spherical seat 19 over the entire circumference. Therefore, the spherical engaging portions between the convex spherical surface portion 24 of the counteraxial spherical seat 18 and the concave spherical surface portion 36 of the concave spherical seat 19 are lubricated, and most of the lubricating oil flowing out (oozing out) from the outer peripheral edge portion of the spherical surface portion moves downward along the concave spherical surface portion 36 and drops into the annular recessed portion 52 from the outer peripheral edge portion of the concave spherical surface portion 36. The lubricating oil dropped into the annular recessed portion 52 is collected from oil through holes, not shown, formed in the oil pan 20, and is supplied again from the discharge port formed in the concave spherical surface portion 36 to the spherical surface engagement portion between the convex spherical surface portion 24 and the concave spherical surface portion 36 via a lubricating oil flow path.

The guide member 21 is formed in a cylindrical shape as a whole, and has a diameter that increases toward one end side (tip side) in the axial direction, and the guide member 21 is made of, for example, rubber or another material. The cylindrical portion 56 has a circular truncated cone shape, and an annular portion 55 bent radially inward from the other end (base end) in the axial direction of the cylindrical portion 56.

The guide member 21 supports and fixes the radially inner end portion of the annular portion 55 to the side surface of the convex spherical seat 26 of the shafting spherical seat 18 on one axial end side via an annular support ring 51. That is, the radially inner end portion of the annular portion 55 is fixed to the radially outer end portion of the support ring 51 by bonding or the like, and the support ring 51 is fixed to the side surface of the spherical convex surface seat 26 on one axial end side by screwing or the like.

The guide member 21 slidably contacts the outer peripheral surface of one axial end portion (distal end portion) of a circumferential portion (a portion inclined upward, a left portion in fig. 1 and 2) of the cylindrical portion 56 with the concave spherical surface portion 36 of the concave spherical seat 19, and faces one axial end edge (distal end edge) of the remaining portion (a portion inclined downward, a right portion in fig. 1 and 2) of the cylindrical portion 56 with the opening of the annular recess 52 of the oil pan 20. As will be described later, when the pressing portion 10 is formed, the sliding contact position of the outer peripheral surface of the distal end portion of the cylindrical portion 56 with respect to the concave spherical surface portion 36 is along the central axis O of the belt-axis spherical seat 18 in accordance with the rotation and revolution (rocking rotation) of the belt-axis spherical seat 18₁₈A circumferential direction movement as a center.

The cover ring (cover plate) 50 includes an annular covering portion 57 and a folded portion 58 folded upward from a radially inner end portion of the covering portion 57. The cover portion 57 is screwed or the like to fix a radially outer end portion to an upper end portion of the guide ring 49, and covers radially inner portions of the outer ring rotating mechanism 43 and the radial bearing 47.

The shroud ring 50 is configured such that, even when lubricating oil flowing out from the spherical engagement portion between the convex spherical surface portion 24 and the concave spherical surface portion 36 drops onto the upper surface of the covering portion 57, the lubricating oil flows down into the annular recessed portion 52 of the oil pan 20. Specifically, the covering portion 57 is slightly inclined in a direction that is downward as it goes radially outward.

When the pressing portion 10 is formed at the axial inner end portion of the hub main body 7a by the rolling mechanism 15 of this example, first, in a state where the hub main body 7a before the pressing portion 10 is formed and other parts constituting the hub unit bearing 1a are assembled, the hub main body 7a is supported by the support jig 17 without radial play so that the center axis of the hub main body 7a and the reference axis C are coaxial, the axial outer end portion of the hub unit bearing 1a faces downward, and the axial inner end portion of the hub unit bearing 1a faces upward.

Next, by raising the lifter 23, a circumferential portion of the concave groove 54 in the worked portion 12a of the axial spherical seat 18 is pressed against a circumferential portion of an axial inner end portion of the cylindrical portion 9 provided at an axial inner end portion of the hub main body 7 a. At the same time, the driving jig 45 is engaged with the coupling flange 46 of the outer ring 2 a.

Subsequently, the rotating body 39 is rotated about the reference axis C, and the spherical holder with shaft 18 is swung about the reference axis C. At this time, the axial spherical seat 18 has its own central axis O based on the frictional force acting on the contact portion between the concave groove 54 of the worked portion 12a and the axial inner end portion of the cylindrical portion 9₁₈Rotate (spin) on the center. At this time, the spherical surface engagement portion between the convex spherical surface portion 24 and the concave spherical surface portion 36 is forcibly lubricated by the lubricating oil discharged from the plurality of discharge ports formed in the concave spherical surface portion 36. By rotating the spherical bearing 18 in an oscillating manner, a load is applied to a portion in the circumferential direction of the cylindrical portion 9 in the axial direction and in the radial direction, and the portion to which the load is applied is continuously changed in the circumferential direction, whereby the axial inner end portion of the cylindrical portion 9 is gradually plastically deformed to form the pressing portion 10. In particular, if the pivot angle (inclination angle θ) of the coaxial spherical seat 18 when the pressing portion 10 is formed by the rocking compaction is set to 15 degrees or more (30 degrees or less), the maximum machining load when the rocking compaction is performed can be suppressed to be low.

The rolling device 15 of this example includes a guide member 21. Therefore, during the machining of the pressing portion 10, the lubricating oil that flows out from the outer peripheral edge portion of the spherical engagement portion between the convex spherical surface portion 24 and the concave spherical surface portion 36 can be prevented from dripping and adversely affecting the surrounding environment of the hub unit bearing 1 a.

That is, the lubricating oil that has oozed out from the outer peripheral edge portion of the spherical engaging portion between the convex spherical surface portion 24 and the concave spherical surface portion 36 is blocked by the portion of the outer peripheral surface of the cylindrical portion 56 of the guide member 21 that slidably contacts the concave spherical surface portion 36. The thus-clogged lubricating oil moves downward along the outer peripheral surface of the cylindrical portion 56 by gravity and then drops into the annular recessed portion 52. Alternatively, when the portion of the cylindrical portion 56 that blocks the lubricating oil is displaced downward and the engagement with the concave spherical surface portion 36 is released (in a state of non-sliding contact) in accordance with the swinging rotation (revolution) and the rotation of the belt-axis spherical seat 18, the lubricating oil drops from the outer peripheral edge portion of the cylindrical portion 56 into the annular concave portion 52. As a result, adverse effects on the surrounding environment of the hub unit bearing 1a can be prevented. In addition, the recovery rate of the lubricating oil can be improved, and cost reduction can be achieved.

In this example, the outer peripheral surface of one end portion in the circumferential direction of the cylindrical portion 56 in the axial direction is slidably brought into contact with the concave spherical surface portion 36, but as shown in fig. 4 a and 4B, the axial dimension of the cylindrical portion 56 is increased to increase the contact length (contact area) with the concave spherical surface portion 36, thereby increasing the amount of the clogged lubricating oil (improving the clogging performance). When the axial dimension of the cylindrical portion 56 is long to some extent, the cylindrical portion 56 is disposed in the annular recess 52 by being deformed as shown in fig. 4 (B) in a portion on the side inclined downward.

In this example, the upper end portions of the outer ring rotation mechanism 43, the radial bearing 47, and the guide ring 49 are covered by the covering portion 57 of the cover ring 50. Therefore, even when the lubricating oil that has oozed out from the outer peripheral surface of the sliding contact portion between the outer peripheral surface of the cylindrical portion 56 of the guide member 21 and the concave spherical surface portion 36 flows around from the outer peripheral edge portion (distal end portion) of the cylindrical portion 56 to the inner peripheral surface and drips from the inner peripheral surface of the cylindrical portion 56, or the outer peripheral edge portion of the cylindrical portion 56 is worn out or deteriorated and the lubricating oil cannot be sufficiently blocked, it is possible to prevent adverse effects on the surrounding environment of the hub unit bearing 1 a.

In this example, the case where the axial inner end portion of the hub main body 7a of the hub unit bearing 1a is plastically deformed radially outward by the rolling mechanism 15 to form the pressing portion 10 has been described, but the rolling mechanism of the present invention is not limited to this, and can be used for rolling of various workpieces such as a hub unit bearing having an end face spline at the axial inner end portion of the hub, a bevel gear (bevel gear), and an annular member having a flange portion at the axial end portion. The oscillating machining device of the present invention can be applied to a device for machining other than forging.

[ 2 nd example of embodiment ]

Fig. 5 shows example 2 of the embodiment of the present invention. In this example, as the rubber constituting the guide member 21a, rubber softer (having a lower elastic coefficient) than the rubber constituting the guide member 21 of example 1 of the embodiment is used. Therefore, in a state where the annular portion 55a of the guide member 21a is supported and fixed to the coaxial spherical seat 18 via the support ring 51, the cylindrical portion 56a hangs down from the radially outer end portion of the annular portion 55 a.

In the present example as described above, when the lubricant oil flowing out from the spherical engagement portion between the convex spherical surface portion 24 and the concave spherical surface portion 36 drops, the lubricant oil is caught by the outer peripheral surface of the cylindrical portion 56a of the guide member 21a (adheres to the outer peripheral surface of the cylindrical portion 56 a). The lubricating oil dropped on the outer peripheral surface of the cylindrical portion 56a moves downward along the outer peripheral surface of the cylindrical portion 56a, and drops from the distal end portion of the cylindrical portion 56a into the annular recess 52 of the oil pan 20 or into the annular recess 52 after dropping on the upper surface of the cover ring 50. As a result, as in the swing rolling device 15 of example 1 of the embodiment, it is possible to prevent adverse effects on the environment around the hub unit bearing 1 a.

In this example, since the cylindrical portion 56a of the guide member 21a is not brought into sliding contact with the concave spherical surface portion 36, the cylindrical portion 56a can be prevented from being worn or broken, and the durability of the guide member 21a can be improved. The structure and the operation and effects of the other portions are the same as those of embodiment 1.

[ example 3 of embodiment ]

Fig. 6 shows example 3 of the embodiment of the present invention. The guide member 21b of this example includes an annular seal portion 59 and a plurality of guide pieces 60. The seal portion 59 is bonded and supported over the entire circumference to the radial outer end portion of the end surface 61, which is the side surface on one end side in the axial direction of the convex spherical seat 26 of the axial spherical seat 18. In this example, the outer peripheral surface of the seal portion 59 and the concave spherical surface portion 36 are not in contact with each other, but the outer peripheral surface of the seal portion 59 and the concave spherical surface portion 36 of the concave spherical seat 19 may be in sliding contact with each other. In this example, the seal portion 59 is formed of a gland packing (gland packing) having a rectangular cross section.

The guide piece 60 is made of, for example, rubber or synthetic resin, and can be configured in a string shape or a belt shape. The guide pieces 60 are provided to hang downward from a plurality of portions in the circumferential direction of the seal portion 59. The leading end (lower end) of the guide piece 60 is disposed in the annular recess 52 of the oil pan 20. In the case where the guide piece 60 is formed in a string shape, the guide piece 60 may be prevented from being excessively deformed by a metal core member.

In the present example as described above, the lubricating oil that has flowed out from the outer peripheral edge portion of the spherical surface engagement portion between the convex spherical surface portion 24 and the concave spherical surface portion 36 moves to the guide piece 60 via the outer peripheral surface of the seal portion 59 of the guide member 21 b. The lubricating oil moved to the guide piece 60 moves downward along the guide piece 60 and is guided to the annular recess 52 of the oil pan 20. The structure and the operation and effects of the other portions are the same as those of embodiment 1 and embodiment 2.

In one embodiment, a swing machining device (15) is provided with a reference shaft, a support jig (17), a spherical seat (18) with a shaft, a concave spherical seat (19), an oil pan (20), and guide members (21, 21a, 21 b). The support jig (17) is used for supporting the workpiece in a manner that the central axis of the workpiece and the reference axis are coaxial. The spherical seat (18) with a shaft has a central axis inclined with respect to the reference axis, and has a processing portion (12a) formed at one end in the axial direction, and a convex spherical surface portion (24) formed at an intermediate portion in the axial direction and having a partially spherical shape facing the other end in the axial direction. The concave spherical seat (19) has: a penetration hole (35) through which the other axial end portion of the axial spherical seat (18) (the portion of the axial spherical seat that is located on the other axial end side of the convex spherical portion (24)); and a concave spherical surface part (36) which is in spherical engagement with the convex spherical surface part (24). The oil pan (20) has an annular recess (52) that faces the outer peripheral edge of the concave spherical portion (36) over the entire circumference. The guide members (21, 21a, 21b) support the other end (base end) in the axial direction at one end side portion in the axial direction of the spherical seat with shaft (18), and guide the lubricating oil flowing out from the spherical engagement portion between the convex spherical surface portion (24) and the concave spherical surface portion (36) toward the annular recessed portion (52).

The guide members (21, 21a, 21b) can be configured in a tubular shape, the outer peripheral surface of one axial side portion (distal end portion) of a portion of the guide members (21, 21a, 21b) in the circumferential direction is slidably brought into contact with the concave spherical portion (36), one axial end edge (distal end edge) of the remaining portion of the guide members (21, 21a, 21b) is opposed to the opening of the annular recess (52), or the axial middle portion to one axial end portion of the remaining portion of the guide members (21, 21a, 21b) is disposed in the annular recess (52).

Alternatively, the guide members (21, 21a, 21b) may be configured to be cylindrical, and one side portion (distal end portion) in the axial direction of the guide members (21, 21a, 21b) may be configured to hang downward.

Alternatively, the axial spherical seat (18) may have an end surface facing one end in the axial direction, and the guide member (21, 21a, 21b) may include an annular seal portion (59) supported and fixed to the end surface, and a string-like or band-like guide piece (60) hanging downward from a plurality of portions in the circumferential direction of the seal portion (59).

In one example, an annular cover plate (50) may be supported and fixed radially inside the oil pan (20).

Preferably, the inclination angle of the central axis of the spherical seat with shaft (18) with respect to the reference axis is set to 15 degrees or more.

In one aspect of the present invention, in the swing machining device (15), it is preferable that the pivot spherical seat (18) includes a main body portion (25), a base plate (27), and stampers (13a, 13 b). The main body part (25) has a central axis inclined with respect to the reference axis and the convex spherical part (24). The base plate (27) has a holding recess (67) on the side surface on one end side in the axial direction, and is coupled and fixed to the side surface on one end side in the axial direction of the main body (25). The dies (13a, 13b) have a machined portion (12a) at one axial end portion thereof, and are fixedly coupled to the base plate (27) in a state where the other axial end portion thereof is fitted into the holding recess portion (67) without play, thereby achieving radial positioning with respect to the base plate (27).

In one aspect of the present invention, a hub unit bearing (1a) that is a target of a method for manufacturing a hub unit bearing includes: an outer ring (2a) having a plurality of rows of outer ring raceways on an inner circumferential surface thereof; a hub (3a) having a plurality of inner ring raceways on an outer circumferential surface; and rolling elements (6a) arranged in a plurality of rows between the outer ring raceways and the inner ring raceways, and arranged to be rollable. The hub (3a) is provided with inner rings (8a, 8b) and a hub body (7 a). The inner rings (8a, 8b) have, on the outer peripheral surface, an axially inner one of the inner ring raceways. The hub body (7a) includes: an axially outer inner raceway among the plurality of rows of inner raceways is provided on an outer peripheral surface of an axially intermediate portion directly or via another member; a fitting cylinder section (9) that is located axially inward of the axially outward inner ring raceway and that is fitted to the outer ring; and a pressing portion (10) that is bent radially outward from an axial inner end portion of the fitting cylinder portion (9) and presses an axial inner end surface of the inner ring.

In a method for manufacturing a hub unit bearing according to an aspect of the present invention, the pressing portion (10) is formed by plastically deforming a cylindrical portion (9) provided at an axial inner end portion of the hub main body (7a) before the pressing portion (10) is formed, radially outward, using the wobble processing device (15) as described above.

In one aspect of the present invention, an automobile to be subjected to a method for manufacturing an automobile includes a hub unit bearing. In this method of manufacturing an automobile, the hub unit bearing is manufactured by the method of manufacturing a hub unit bearing as described above.

Description of the reference numerals

1a wheel hub unit bearing (workpiece, processed object)

2a outer ring

3a wheel hub

4c, 4d outer ring raceway

5c, 5d inner ring raceway

6a rolling element

7a hub body

8a, 8b inner ring

9 cylindrical part

10 pressing part

12a processing part

13a, 13b pressing die (with tool)

15 swing processing device (swing rolling machine)

16 machine frame

17 supporting tool (supporting body)

18 spherical seat with axle (swinging body)

19 concave spherical seat

20 oil pan

21. 21a, 21b guide member

22 support recess

23 lifting platform

24 convex spherical surface part

25. 25a shaft body

26 convex spherical seat

27 base plate

28 shaft part

29. 29a flange part

30 st 1 positioning recess

31 fitting recess

32 through hole

33 1 st positioning projection

34 2 nd positioning projection

35 penetration hole

36 concave spherical surface part

37 stepped hole

38 driving mechanism

39 rotating body

40 bearing

41 bearing device

42 holding hole

43 outer ring rotating mechanism

44 drive ring

45 driving jig

46 joining flange

47 radial bearing

48 ball spline

49 guide ring

50 cover ring (cover plate)

51 supporting ring

52 annular recess

53 nose

54 groove

55. 55a ring part

56. 56a cylindrical part

57 covering part

58 fold-back part

59 sealing part

60 guide piece

61 end face

62 cylindrical part

63 ring part

64 nd 2 nd positioning concave part

65 inward flange

66 torsion coil spring

67 holding recess