JP2010260144A - Method for machining sealing face, outside joint member for constant velocity universal joint, and wheel bearing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for machining a sealing face, an outside joint member for a constant velocity universal joint, and a wheel bearing device which can suppress the generation of dust, sludge (waste) and the like and is echo-friendly because the sealing face can be formed stably in a short time and polishing is not performed. <P>SOLUTION: Sealing surfaces of stem shafts 10, 26 of the outside joint member are formed by lathe cutting by plunge machining for each pitch so as not to generate a lead seam. Sealing lands 50, 51, 52, 53 of the wheel bearing device are plunge-machined at each pitch so as not to generate a lead seam. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a seal surface processing method, an outer joint member for a constant velocity universal joint having a seal surface using the seal surface processing method, and a wheel bearing device.

  In an outer joint member for a constant velocity universal joint, a wheel bearing device, and the like, a seal surface with which the seal member abuts is formed. Conventionally, when processing such a sealing surface, a polishing apparatus and a polishing method for a shaft-like workpiece as described in Patent Document 1 have been proposed.

  In the thing of this patent document 1, the oil seal fitting part (seal surface) is cut with a cutting tool, and then this seal surface is polished with a grindstone wheel.

JP 2007-15091 A

  In the thing of the said patent document 1, while the cutting process by a cutting tool and the grinding | polishing process by a grindstone were required, the working time as a whole became long, and the whole apparatus was complicated and enlarged. In addition, dust, sludge (waste), etc. are generated by the polishing process, and the working environment is deteriorated.

  In view of the above-described problems, the present invention can stably form a sealing surface in a short time and does not perform polishing, so that generation of dust, sludge (waste), etc. can be suppressed and the environment can be suppressed. A friendly seal surface processing method, an outer joint member for a constant velocity universal joint, and a wheel bearing device are provided.

  In the sealing surface processing method of the present invention, the sealing surface is formed by turning by plunge processing for each pitch without causing a lead. Plunge machining is a machining method that performs indentation cutting in the main axis direction. For this reason, in this invention, the cutting tool which is a processing tool is pushed in the direction orthogonal to the sealing surface to be processed.

  According to the seal surface processing method of the present invention, since the lead stitch (cutting stitch) cannot be made, a polishing step for removing the lead stitch is not required. For this reason, the overall work time can be shortened, and polishing equipment used in the polishing process is not required. In addition, since it is plunge processing for each pitch that does not cause a lead, plunge processing is performed along the length direction (axial direction) even for a seal surface having a large length dimension (axial length). Can and can respond.

  A first outer joint member of the present invention is an outer joint member of a constant velocity universal joint disposed on an inboard side in a state assembled to a vehicle, and protrudes from a cup portion and a bottom wall of the cup portion. The stem shaft has a seal surface processed by the seal surface processing method.

  According to the first outer joint member of the present invention, the seal surface of the stem shaft can be formed by plunge processing without causing lead eyes (cutting lines).

  The second outer joint member of the present invention is an outer joint member of a constant velocity universal joint disposed on the inboard side in a state assembled to a vehicle, and protrudes from the cup portion and the bottom wall of the cup portion. The stem shaft has an oil groove forming surface, and the oil groove forming surface is processed by the seal surface processing method.

  According to the second outer joint member of the present invention, the oil groove forming surface of the stem shaft can be formed by plunge processing without causing a lead eye (cutting eye).

  The third outer joint member of the present invention is an outer joint member of a constant velocity universal joint disposed on the outboard side in a state assembled to a vehicle, and an oil seal surface is provided on the outer diameter surface of the bottom wall of the cup portion. The oil seal surface is processed by the sealing surface processing method described above.

  According to the third outer joint member of the present invention, the oil seal surface can be formed by plunge processing without causing a lead eye (cutting eye).

  The first wheel bearing device of the present invention includes an inner member having a double row inner rolling surface, an outer member having a double row outer rolling surface facing the double row inner rolling surface, A wheel bearing device including a rolling element disposed between an inner rolling surface of an inner member and an outer rolling surface of an outer member, wherein the outer member has an axial end portion. An outer seal land for a sealing member to be sealed is provided, and the outer seal land is processed by the sealing surface processing method.

  According to the first wheel bearing device of the present invention, the outer seal land at the axial end portion of the outer member can be formed by plunge processing without causing a lead eye (cutting eye).

  The second wheel bearing device of the present invention includes an inner member having a double row inner rolling surface, an outer member having a double row outer rolling surface opposite to the double row inner rolling surface, A rolling element disposed between the inner rolling surface of the inner member and the outer rolling surface of the outer member, and the inner member has a wheel mounting flange projecting on the outer diameter surface thereof. A bearing device for a wheel having a hub ring, wherein an inner seal land for a seal member on an outboard side is provided on an outer diameter surface of the hub ring, and the inner seal land is used in the sealing surface processing method. Is processed.

  According to the second wheel bearing device of the present invention, the inner seal land of the outer diameter surface of the hub wheel can be formed by plunge processing without causing a lead eye (cutting eye).

  The third wheel bearing device of the present invention includes an inner member having a double row inner rolling surface, an outer member having a double row outer rolling surface facing the double row inner rolling surface, A rolling element disposed between the inner rolling surface of the inner member and the outer rolling surface of the outer member, and the inner member has a wheel mounting flange projecting on the outer diameter surface thereof. A bearing device for a wheel having a hub wheel and an inner ring attached to an end portion on the inboard side of the hub wheel, for an inboard side sealing member on an outer diameter surface of the inner ring on the inboard side The inner seal land is processed by the sealing surface processing method.

  According to the third wheel bearing device of the present invention, the inner seal land of the inner ring can be formed by plunge processing without causing a lead eye (cutting eye).

  In the sealing surface processing method of the present invention, the overall operation time can be shortened, and the productivity is excellent. A polishing step is not required, and generation of dust, sludge (waste) or the like can be suppressed, and environmentally friendly processing can be performed. In addition, a polishing facility is not required, and the seal surface processing apparatus used for this seal surface processing method can be simplified as a whole, and cost reduction can be achieved. Further, even a sealing surface having a large length dimension (axial length) can be handled, and various sealing surfaces can be processed stably. Furthermore, the chips can be finely divided and the processing of the chips becomes easy.

  In the first outer joint member, the seal surface of the stem shaft can be formed by plunge processing without causing a lead eye (cutting eye), and in the second outer joint member, the oil groove of the stem shaft is formed in the lead eye. The third outer joint member can be formed by plunge processing without causing a lead eye (cutting eye). For this reason, in these sealing surface processing, the effects of the sealing surface processing method can be enjoyed, and the sealing surface is processed with high accuracy at a low cost in a short time.

  In the first wheel bearing device of the present invention, the outer seal land at the end in the axial direction of the outer member can be formed by plunge processing without causing a lead eye (cutting eye). In the second wheel bearing device, the inner seal land of the outer diameter surface of the hub wheel can be formed by plunge processing without causing a lead eye (cutting eye). In the third wheel bearing device, The inner seal land of the inner ring can be formed by plunge processing without generating a lead eye (cutting eye). For this reason, in these sealing surface processing, the effects of the sealing surface processing method can be enjoyed, and the sealing surface is processed with high accuracy at a low cost in a short time.

It is a simplification figure showing movement of a processing tool in a seal surface processing method of the present invention. It is sectional drawing of the outer joint member of the constant velocity universal joint of the inboard side of this invention. It is sectional drawing of the outer joint member of the constant velocity universal joint of the outboard side of this invention. It is sectional drawing of the wheel bearing apparatus of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. FIG. 1 shows a sealing surface processing method according to the present invention. In this sealing surface processing method, a tool 1 of a processing tool is operated as indicated by arrows A and B, and sealing is performed by turning by plunge processing at predetermined pitches. The surface 2 is formed. That is, the sealing surface 2 is processed by using the outer diameter surface of the rod-shaped body 3 having a circular cross section as the sealing surface 2.

  The rod-shaped body 3 is made of, for example, a medium carbon steel containing 0.40 to 0.80 wt% of carbon such as S53C. A hardened layer is formed on the outer diameter surface. As a hardening process which forms a hardened layer, induction hardening, carburizing hardening, etc. are performed. Quenching by high-frequency heating is a quenching method that applies the principle of heating a conductive object by placing Joule heat in a coil through which high-frequency current flows, and generating Joule heat by electromagnetic induction. is there. Carburizing and quenching is a process in which carbon is impregnated from the surface layer (carburizing treatment) by heating the steel in a carburizing agent such as activated carbon-rich gas, liquid or solid for a long time. It is a method of quenching and tempering steel.

  For this reason, the turning with the cutting tool 1 of the machining tool is a hardened steel cutting. Hardened steel cutting is simply cutting, and since cutting is usually performed in the state of raw material, it was referred to as hardened steel cutting in order to clarify that the cutting was after heat treatment (after quenching). Since cutting is performed after quenching, the heat treatment deformation of the material can be removed in this cutting process. When quenching, tensile residual stress tends to remain, and fatigue strength decreases as it is. For this reason, if the surface is cut, a compressive residual stress can be given to the outermost surface portion, thereby improving the fatigue strength.

  The cutting tool 1 is a cutting tool capable of cutting hardened steel. For example, a sintered tool obtained by adding a special ceramic binder to CBN (cubic boron nitride) can be used.

  In this case, the rod-shaped body 3 is supported by a support device (not shown) and is driven to rotate around its axis. Further, the cutting tool 1 performs plunging at predetermined pitches along the axial direction of the rod-shaped body 3. That is, the cutting tool 1 is pushed into the outer diameter surface of the rod-shaped body 3 along the direction perpendicular to the axial direction of the rod-shaped body 3 as indicated by an arrow A. Thereafter, after the cutting tool 1 is returned, the cutting tool 1 is moved by a predetermined pitch in the direction of the arrow B along the axial center direction of the bar-shaped body 3, and then the cutting tool 1 is again pushed against the outer diameter surface of the bar-shaped body 3 as indicated by the arrow A. Include. Thereafter, the same operation is repeated.

  The predetermined pitch in the direction of arrow B is a pitch at which no lead stitch (cutting stitch) is formed on the outer diameter surface (seal surface 2), which is a machining surface, and overlaps with a part of the adjacent plunge machining portion. .

  If plunge processing as described above is performed, lead eyes (cutting processing eyes) cannot be formed, and therefore a polishing step for removing the lead eyes is not required. For this reason, generation | occurrence | production of dust, sludge (waste) etc. can be suppressed, and an environmentally friendly process can be performed. And overall work time can be shortened, and the productivity is excellent. Further, polishing equipment used for the polishing process is not required. For this reason, the sealing surface processing apparatus used for this sealing surface processing method can be simplified as a whole, and cost reduction can be achieved. Furthermore, since it is plunge processing for each pitch that does not cause lead eyes, plunge processing is performed along the length direction (axial direction) even for a seal surface having a large length dimension (axial length). Can and can respond. For this reason, various sealing surfaces can be processed stably. Furthermore, the chips can be finely divided and the processing of the chips becomes easy.

  By the way, although the said rod-shaped body 3 provided the hardened layer on the surface, you may not provide such a hardened layer. In this way, even if a hardened layer is not provided on the surface, a sealing surface that does not cause lead eyes can be stably processed on this surface.

  FIG. 2 shows an outer joint member of the constant velocity universal joint according to the present invention. The constant velocity universal joint in this case is the inboard of the axle module including a constant velocity universal joint on the outboard side, a constant velocity universal joint on the inboard side, and a drive shaft connecting these constant velocity universal joints. Side constant velocity universal joint. Here, the side closer to the outside of the vehicle when assembled to the vehicle is referred to as the outboard side (left side in the drawing), and the side closer to the center is referred to as the inboard side (right side in the drawing).

  The constant velocity universal joint on the inboard side is a sliding type double offset type constant velocity universal joint. The double offset type constant velocity universal joint includes an outer ring 10 as an outer joint member in which a plurality of track grooves 13 extending in the axial direction are formed on a cylindrical inner peripheral surface 14, and a plurality of track grooves extending in the axial direction on a spherical outer peripheral surface. An inner ring (not shown) as an inner joint member formed with a plurality of torque transmission balls (not shown) each incorporated in a ball track formed by a pair of a track groove 13 of the outer ring 10 and a track groove of the inner ring. And a cage (not shown) for holding a torque transmission ball.

  The stem shaft 12 has a large-diameter portion 12a on the cup portion 11 side, a male spline portion 12b at the tip, and an intermediate portion 12c between the large-diameter portion 12a and the male spline portion 12b. An oil groove 16 is formed in the intermediate portion 12c. The large diameter portion 12a is connected to the bottom wall outer surface (back surface) 15 on the cup portion 11 side via a boss portion 15a.

  In this case, the outer diameter surface of the large diameter portion 12a and the outer diameter surface of the intermediate portion 12c are the seal surfaces processed by the seal surface processing method. That is, with respect to the outer diameter surface of the large diameter portion 12a and the outer diameter surface of the intermediate portion 12c, as shown in FIG. Is to be turned. In the intermediate portion 12c, the oil groove 16 is formed after such plunge processing. Further, the outer diameter surface of the large diameter portion 12a and the outer diameter surface of the intermediate portion 12c may be provided with a hardened layer on the surface or without a hardened layer.

  Next, FIG. 3 shows an outer joint member of another constant velocity universal joint according to the present invention. The constant velocity universal joint in this case is a constant velocity universal joint on the outboard side of the axle module. That is, the constant velocity universal joint on the outboard side is a fixed type constant velocity universal joint. This constant velocity universal joint has an outer ring 23 as an outer joint member in which a plurality of track grooves 22 are formed on the inner spherical surface 21, and a plurality of track grooves that are paired with the track grooves 22 of the outer ring 23 on the outer spherical surface. An inner ring (not shown) as an inner joint member, a plurality of balls (not shown) that are interposed between the track grooves 22 of the outer ring 23 and the track grooves of the inner ring, and transmit the torque; A cage (not shown) is provided between the inner ring and the outer spherical surface to hold the ball.

  The outer ring 23 includes a cup portion 24 having a track groove 22 on the inner spherical surface 21, and a stem shaft 26 protruding from the bottom wall 25 of the cup portion 24. An oil seal surface 27 is formed on the outer diameter surface of the bottom wall 25. The stem shaft 26 has a male spline 26a and a male screw portion 26b.

  In this case, the oil seal surface 27 is a seal surface processed by the seal surface processing method. That is, as shown in FIG. 1, the cutting tool 1 of the machining tool is operated as indicated by an arrow with respect to the oil seal surface 27 and is turned by plunge machining at a predetermined pitch.

  In the outer ring 10 shown in FIG. 2, the oil seal surface 27 can be formed by plunge processing without causing lead eyes (cutting lines). In the outer ring 23 shown in FIG. It can be formed by plunge processing without producing cutting edges. For this reason, in these sealing surface processing, the effects of the sealing surface processing method can be enjoyed, and the sealing surface is processed with high accuracy at a low cost in a short time. The oil seal surface 27 may be provided with a hardened layer on its surface or may not be provided with a hardened layer.

  Next, FIG. 4 shows a wheel bearing device according to the present invention. The wheel bearing device includes an inner member 33 having double-row inner rolling surfaces 31 and 32, and a double-row inner rolling surface. The outer member 30 having double rows of outer rolling surfaces 34 and 35 facing the outer circumferential surfaces 31 and 32, the inner rolling surfaces 31 and 32 of the inner member 33, and the outer rolling surfaces 34 and 35 of the outer member 30, Rolling elements 36 disposed between the two.

  The inner member 33 includes a hub wheel 38 having a wheel mounting flange 37 projecting from an outer diameter surface thereof, and an inner ring 39 attached to an end portion of the hub wheel 38 on the inboard side. That is, a small-diameter portion 41 is provided at the inboard side end of the tubular portion 40 of the hub wheel 38, and the inner ring 39 is fitted to the small-diameter portion 41. An outboard-side inner rolling surface 31 is formed on the outer diameter surface of the hub wheel 38, and an inboard-side inner rolling surface 32 is formed on the outer diameter surface of the inner ring 39. Further, the inboard side end portion of the small diameter portion 41 is swaged to the outer diameter side, and the swaged portion 42 is used for rolling bearings (inward rolling of the inner member 33, the outer member 30, and the inner member 33. Preload is applied to the rolling elements 36 disposed between the surfaces 31 and 32 and the outer rolling surfaces 34 and 35 of the outer member 30.

  A female spline 45 is formed on the inner diameter surface of the tube portion 40 of the hub wheel 38, and the stem shaft 26 of the outer joint member (outer ring 23) of the constant velocity universal joint on the outboard side is formed on the tube portion 40 of the hub wheel 38. Is inserted. Then, the male spline 26 a of the stem shaft 26 is fitted to the female spline 45. In addition, the male screw portion 26b of the stem shaft 26 protrudes from the tube portion 40 toward the outboard side, and a nut member is screwed to the protruding portion, so that the constant velocity universal joint and the hub wheel 38 are integrated. The wheel mounting flange 37 is provided with a bolt insertion hole 46, and a hub bolt 47 is fitted into the bolt insertion hole 46. A vehicle body mounting flange 48 is provided on the outer diameter surface of the outer member 30.

  By the way, the opening part of the axial direction edge part of the outer member 30 is sealed by seal member S1, S2. Therefore, an inner seal land 50 for the seal member S1 is formed on the outer diameter surface of the hub wheel 38 between the wheel mounting flange 37 and the inner rolling surface 31 on the outboard side. An inner seal land 51 for the seal member S2 is formed on the outer diameter surface of the inner ring 39 on the inboard side.

  Further, an outer seal land 52 for sealing member S1 that seals the end portion on the outboard side of the inner diameter surface of outer member 30 is formed, and the end portion on the inboard side of the inner diameter surface of outer member 30 is sealed. An outer seal land 53 for the sealing member S2 to be formed is formed.

  For this reason, the inner seal lands 50 and 51 and the outer seal lands 52 and 53 are the seal surfaces processed by the seal surface processing method. That is, as shown in FIG. 1, the cutting tool 1 of the machining tool is operated as indicated by an arrow with respect to the inner seal lands 50 and 51, and is turned by plunge machining for each predetermined pitch. As shown in FIG. 1, the tool 1 of the machining tool is operated as indicated by an arrow with respect to the outer seal lands 52 and 53, and is turned by plunge machining at a predetermined pitch. The inner seal lands 50 and 51 and the outer seal lands 52 and 53 may be provided with a hardened layer on the surface or may not be provided with a hardened layer.

  In the wheel bearing device shown in FIG. 4, the outer seal lands 52 and 53 at the axial end of the outer member 30, the inner seal land 50 on the outer diameter surface of the hub wheel 38, and the inner seal land of the inner ring 39. 51 can be formed by plunge processing without lead (cutting). For this reason, in these sealing surface processing, the effects of the sealing surface processing method can be enjoyed, and the sealing surface is processed with high accuracy at a low cost in a short time.

  As described above, the embodiment of the present invention has been described. However, the present invention is not limited to the above-described embodiment, and various modifications are possible. For example, the cutting depth in the direction of arrow A and the movement in the direction of arrow B in FIG. As the amount, etc., the size, shape, and material of the cutting tool 1 to be used and the material and hardness of the work piece (rod-like body 3 etc.) are within the range in which plunge machining can be performed without generating lead eyes (cutting lines). Various changes can be made according to the above.

  Since the constant velocity universal joint on the inboard side is a sliding type constant velocity universal joint, it may be a tripod type or cross groove type other than the double offset type, and the seal surface of these stem shafts is the seal surface of the present invention. It is processed by the processing method. Since the constant velocity universal joint on the outboard side is also a fixed type constant velocity universal joint, even if the track groove is a bar field type (BJ) consisting of only an arc portion, the track groove has an arc portion and a straight portion. An undercut free type (UJ) provided may be used, and the seal surfaces of these stem shafts are processed by the seal surface processing method of the present invention.

  In FIG. 4, all of the inner seal lands 50 and 51 and the outer seal lands 52 and 53 are processed by the seal surface processing method of the present invention, but at least one seal land of the present invention is used. What is necessary is just to be processed by the sealing surface processing method. Although the so-called third generation wheel bearing device is shown in FIG. 4, a vehicle mounting flange is provided on the outer member even in a structure using a double row rolling bearing called a first generation alone. Even in what is referred to as the second generation, which is integrally formed, a rolling surface on the inboard side of the double row rolling bearing is formed on the outer periphery of the outer joint member constituting the constant velocity universal joint. It may be of 4 generations.

11 Cup portion 12 Stem shaft 24 Cup portion 26 Stem shaft 27 Oil seal surface 30 Outer members 31, 32 Inner rolling surface 33 Inner members 34, 35 Outer rolling surface 36 Rolling body 38 Hub wheel 39 Inner ring 40 Tube portion 50 , 51 Inner seal land 52, 53 Outer seal land S1, S2 Seal member

Claims (7)

  A seal surface machining method comprising forming a seal surface by turning by plunge machining for each pitch without causing a lead.   An outer joint member of a constant velocity universal joint disposed on an inboard side in a state assembled to a vehicle, comprising a cup portion and a stem shaft projecting from a bottom wall of the cup portion. An outer joint member having a seal surface processed by the seal surface processing method according to claim 1.   An outer joint member of a constant velocity universal joint disposed on an inboard side in a state assembled to a vehicle, comprising: a cup portion; and a stem shaft protruding from a bottom wall of the cup portion, the stem shaft 2 has an oil groove forming surface, and the oil groove forming surface is processed by the seal surface processing method according to claim 1.   An outer joint member of a constant velocity universal joint disposed on the outboard side in a state assembled to a vehicle, wherein an oil seal surface is formed on an outer diameter surface of a bottom wall of the cup portion, and the oil seal surface is The outer joint member processed by the sealing surface processing method according to Item 1. Inner member having double row inner rolling surface, outer member having double row outer rolling surface facing double row inner rolling surface, inner rolling surface and outer member of inner member A wheel bearing device including a rolling element disposed between the outer rolling surface of the wheel,
The outer member has an outer seal land for a seal member that seals an axial end portion, and the outer seal land is processed by the seal surface processing method according to claim 1. A wheel bearing device that is characterized. Inner member having double row inner rolling surface, outer member having double row outer rolling surface facing double row inner rolling surface, inner rolling surface and outer member of inner member A rolling element disposed between the outer rolling surface and the inner member is a wheel bearing device having a hub wheel having a wheel mounting flange projecting on an outer diameter surface thereof,
An inner seal land for a seal member on the outboard side is provided on the outer diameter surface of the hub wheel, and the inner seal land is processed by the seal surface processing method according to claim 1. A wheel bearing device characterized by the above. Inner member having double row inner rolling surface, outer member having double row outer rolling surface facing double row inner rolling surface, inner rolling surface and outer member of inner member Rolling member disposed between the outer raceway and the inner member, a hub wheel having a wheel mounting flange projecting on an outer diameter surface thereof, and an inboard side of the hub wheel. A bearing device for a wheel having an inner ring attached to an end,
An inner seal land for an inboard side seal member is provided on the outer diameter surface of the inner ring on the inboard side, and the inner seal land is processed by the seal surface processing method according to claim 1. A wheel bearing device comprising:

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