JP2018044572A - Bearing device for wheel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bearing device for a wheel capable of preventing generation of impression on a rolling surface, thereby preventing generation of foreign sound caused by the impression, and degradation of a bearing life.SOLUTION: In a bearing device 1 for a wheel including an inner member 3 composed of a hub wheel 4 having a small-diameter step portion 4a extended in an axial direction, and at least one inner ring 5 fitted to the small-diameter step portion 4a of the hub wheel 4, and provided with inner rolling faces 5a, 4d of double rows opposed to outer rolling faces 2c, 2d of double rows, on an outer periphery, the small-diameter step portion 4a is provided with a locking part 4b expanded to a radial outer side, an annular member 12 is disposed between the locking part 4b and the inner ring 5 in a state of being fitted to the small-diameter step portion 4a, and the annular member 12 has elastic property in an axial direction, and energizes the inner ring 5 to an outer side.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a wheel bearing device.

  2. Description of the Related Art Conventionally, a wheel bearing device that rotatably supports a wheel in a suspension device such as an automobile is known. In the wheel bearing device, an outer member is fixed to a knuckle constituting the suspension device. In the wheel bearing device, an inner member is disposed inside the outer member, and a rolling element is interposed between the outer member and the inner member. In this way, the wheel bearing device constitutes a rolling bearing structure, and the wheel attached to the inner member is rotatable.

  By the way, in such a wheel bearing device, when a large and shocking external force is applied, an indentation may be formed on the rolling surface of the rolling element. Specifically, when a large and shocking external force is applied, such as when a wheel rides on a curbstone, the rolling element rises on the rolling surface, so-called edge load occurs, and the rolling surface becomes indented. There was. For this reason, like patent document 1, the wheel bearing apparatus which makes the ratio of the depth of a rolling surface and the diameter of a rolling element more than a fixed value was proposed (refer FIG. 11). However, even in such a wheel bearing device, if a larger and more shocking external force than expected is applied, the rolling surface may be indented. As a result, abnormal noise due to the indentation may occur or the bearing life may be reduced.

JP2015-224655A

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a wheel bearing device in which no indentation is formed on the rolling surface. As a result, an object of the present invention is to provide a wheel bearing device in which abnormal noise due to indentation does not occur and the bearing life does not decrease.

The first invention is
An outer member having a double row outer raceway formed on the inner periphery;
A hub wheel having a small-diameter step portion extending in the axial direction, and at least one inner ring fitted to the small-diameter step portion of the hub wheel, and having a double row facing the outer rolling surface of the double row on the outer periphery. An inner member formed with an inner rolling surface;
In a wheel bearing device comprising: a double-row rolling element interposed between the rolling surfaces of the outer member and the inner member so as to freely roll.
The small diameter step is provided with a locking portion that extends radially outward,
An annular member disposed between the locking portion and the inner ring in a state of being fitted to the small-diameter stepped portion;
The annular member has an elastic property in the axial direction and urges the inner ring toward the outer side.

2nd invention is the wheel bearing apparatus which concerns on 1st invention,
The annular member includes an annular plate that is in contact with the engaging portion, and the non-slip process is applied to the engaging portion joining surface of the annular plate or an adhesive is applied.

3rd invention is the bearing apparatus for wheels which concerns on 1st invention,
The annular member includes an annular plate that is in contact with the inner ring, and a non-slip process is applied to the inner ring joint surface of the annular plate or an adhesive is applied.

The fourth invention is the wheel bearing device according to any one of the first to third inventions,
The inner ring is fitted through an assembly structure that is not rotatable in the circumferential direction with respect to the hub ring.

  As effects of the present invention, the following effects can be obtained.

  In the wheel bearing device according to the present invention, the small diameter step portion is provided with a locking portion that extends radially outward. Moreover, the annular member arrange | positioned between a latching | locking part and an inner ring in the state fitted by the small diameter step part is comprised. The annular member has an elastic characteristic in the axial direction and urges the inner ring toward the outer side. According to such a wheel bearing device, when the inner ring slides toward the inner side against the urging force of the annular member, the contact pressure between the rolling element and the rolling surface is reduced. Therefore, even when a large and shocking external force is applied, such as when the wheel rides on a curb, it is possible to prevent the rolling element from being indented on the rolling surface. As a result, no abnormal noise due to the indentation is generated, and a reduction in bearing life can be prevented.

  In the wheel bearing device according to the present invention, the annular member includes an annular plate that is in contact with the engaging portion, and the non-slip process is applied to the engaging surface of the engaging portion of the annular plate or an adhesive is applied. ing. According to such a wheel bearing device, since the annular member and the hub wheel do not rotate relative to each other, it is possible to prevent wear at the contact portions.

  In the wheel bearing device according to the present invention, the annular member includes an annular plate in contact with the inner ring, and a non-slip process is applied to the inner ring joint surface of the annular plate or an adhesive is applied. According to such a wheel bearing device, since the annular member and the inner ring do not rotate relative to each other, it is possible to prevent wear at the contact portions.

  In the wheel bearing device according to the present invention, the inner ring is fitted via an assembly structure that cannot rotate in the circumferential direction with respect to the hub ring. According to such a wheel bearing device, since the inner ring and the hub ring do not rotate relative to each other, it is possible to prevent wear at the contact portions.

The perspective view which shows the whole structure of the wheel bearing apparatus. Sectional drawing which shows the whole structure of the wheel bearing apparatus. The expanded sectional view which shows the partial structure of the wheel bearing apparatus. The expanded sectional view which shows the partial structure of the wheel bearing apparatus. The expanded view which shows the principal part structure of the bearing apparatus for wheels which is 1st embodiment. Sectional drawing which shows the principal part structure of the bearing apparatus for wheels. Sectional drawing which shows the function by the principal part structure of the bearing apparatus for wheels. The expanded view which shows the principal part structure of the bearing apparatus for wheels which is 2nd embodiment. The expanded view which shows the principal part structure of the bearing apparatus for wheels which is 3rd embodiment. Sectional drawing which shows the assembly structure of an inner ring | wheel. Sectional drawing which shows the principal part structure of the wheel bearing apparatus which is a conventional product.

  Below, the wheel bearing apparatus 1 which concerns on this invention is demonstrated using FIGS. 1-4. 2 is a cross-sectional view taken along the line AA in FIG. 3 and 4 are enlarged views of a partial region in FIG.

  The wheel bearing device 1 supports a wheel rotatably in a suspension device such as an automobile. The wheel bearing device 1 includes an outer member 2, an inner member 3 (hub wheel 4 and inner ring 5), a rolling element 6, a seal member 7 (hereinafter referred to as “inner side seal member 7”), a seal Member 10 (hereinafter referred to as “outer side sealing member 10”). Here, the inner side represents the vehicle body side of the wheel bearing device 1 when attached to the vehicle body, and the outer side represents the wheel side of the wheel bearing device 1 when attached to the vehicle body.

  The outer member 2 constitutes the outer ring portion of the rolling bearing structure. The outer member 2 is made of medium-high carbon steel containing 0.40 to 0.80 wt% of carbon such as S53C. An enlarged diameter portion 2 a is formed at the inner side end of the outer member 2. Further, an enlarged diameter portion 2 b is formed at the outer side end portion of the outer member 2. Furthermore, between the enlarged diameter portion 2a and the enlarged diameter portion 2b, an outer rolling surface 2c and an outer rolling surface 2d are formed in an annular shape so as to be parallel to each other. In addition, the outer rolling surface 2c and the outer rolling surface 2d are subjected to induction hardening and cured so that the surface hardness is in the range of 58 to 64 HRC. A knuckle mounting flange 2 e is integrally formed on the outer periphery of the outer member 2. The knuckle attachment flange 2e is provided with a bolt hole 2f.

  The inner member 3 constitutes an inner ring portion of the rolling bearing structure. The inner member 3 includes a hub ring 4 and an inner ring 5.

  The hub wheel 4 is made of medium-high carbon steel containing 0.40 to 0.80 wt% of carbon such as S53C. A small-diameter stepped portion 4a and a locking portion 4b extending radially outward are formed at the inner end of the hub wheel 4. An opening 4 c is formed at the outer end of the hub wheel 4. Furthermore, an annular inner rolling surface 4 d is formed on the outer periphery of the hub wheel 4. The inner rolling surface 4 d faces the outer rolling surface 2 d of the outer member 2. The hub wheel 4 is induction hardened from the small-diameter step portion 4a to the seal land portion (consisting of a shaft surface portion 4e, a curved surface portion 4f, and a side surface portion 4g, which will be described later) through the inner rolling surface 4d. Is cured so as to be in the range of 58 to 64 HRC. A wheel mounting flange 4 h is integrally formed on the outer periphery of the hub wheel 4. The wheel mounting flange 4h is provided with bolt holes 4i arranged in a circumferentially equidistant manner on a concentric circle centering on the rotation axis L of the inner member 3 (hub wheel 4 and inner ring 5), and hub bolts 40 are provided in the respective bolt holes 4i. Is press-fitted.

  The inner ring 5 is made of high carbon chrome bearing steel such as SUJ2. On the outer periphery of the inner ring 5, an inner rolling surface 5a is formed in an annular shape. That is, the inner ring 5 is fitted into the small diameter step portion 4a of the hub wheel 4 and constitutes the inner rolling surface 5a on the outer periphery of the small diameter step portion 4a. The inner rolling surface 5 a faces the outer rolling surface 2 c of the outer member 2. In addition, the inner ring 5 is subjected to so-called quenching and is cured so as to be in the range of 58 to 64 HRC up to the core. The wheel bearing device 1 has a third generation structure in which one inner ring 5 is fitted, but may have a second generation structure in which a pair of inner rings 5 is fitted.

  The rolling element 6 constitutes a rolling part of the rolling bearing structure. The rolling element 6 is made of high carbon chrome bearing steel such as SUJ2. The inner side ball row 6a has a plurality of rolling elements 6 arranged in a ring shape by a cage. The ball row 6a is accommodated in a freely rollable manner between an inner rolling surface 5a formed on the inner ring 5 and an outer rolling surface 2c of the outer member 2 facing the inner rolling surface 5a. On the other hand, the ball row 6b on the outer side also has a plurality of rolling elements 6 arranged in a ring shape by a cage. The ball row 6b is accommodated between the inner rolling surface 4d formed on the hub wheel 4 and the outer rolling surface 2d of the outer member 2 opposite to the inner rolling surface 4d. Note that each rolling element 6 constituting the ball row 6a and the ball row 6b is subjected to so-called quenching and is hardened so as to be in a range of 58 to 64 HRC up to the core.

  The inner side sealing member 7 seals the inner side end portion of the annular space S formed between the outer member 2 and the inner member 3. The inner side seal member 7 includes an annular slinger 8 and an annular seal ring 9.

  The slinger 8 is fitted (externally fitted) to the outer periphery of the inner ring 5.

  Slinger 8 is composed of a ferritic stainless steel sheet (JIS standard SUS430 series, etc.), an austenitic stainless steel sheet (JIS standard SUS304 series, etc.), or a rust-proof cold rolled steel sheet (JIS standard SPCC system, etc.). Has been. The slinger 8 is formed in a shape in which a steel plate cut into an annular shape is bent by pressing and the axial cross-section is bent at a right angle. Thereby, the slinger 8 is formed with a cylindrical fitting portion 8a and a disc-shaped side plate portion 8b extending from the end portion toward the outer member 2. The fitting portion 8 a and the side plate portion 8 b intersect each other vertically, and the fitting portion 8 a is press-fitted along the outer peripheral surface of the inner ring 5. The side plate portion 8b extends toward the outer member 2 and faces a side plate portion 91b of a cored bar 91 described later.

  The seal ring 9 is fitted (internally fitted) to the enlarged diameter portion 2 a of the outer member 2. The seal ring 9 includes a cored bar 91 and a seal rubber 92.

  The core 91 is made of a ferritic stainless steel plate (JIS standard SUS430 or the like), an austenitic stainless steel plate (JIS standard SUS304 or the like), or a rust-proof cold-rolled steel plate (JIS standard SPCC system or the like). It is configured. The cored bar 91 is formed in a shape in which a steel plate cut out in an annular shape is bent by pressing and the axial cross section is bent at a right angle. Thereby, the metal core 91 is formed with a cylindrical fitting portion 91a and a disk-shaped side plate portion 91b extending from the end portion toward the inner member 3 (inner ring 5). The fitting portion 91a and the side plate portion 91b intersect each other substantially perpendicularly, and the fitting portion 91a is press-fitted and fitted along the inner peripheral surface of the enlarged diameter portion 2a. The side plate portion 91b extends toward the inner member 3 (inner ring 5) and faces the side plate portion 8b of the slinger 8 described above. A seal rubber 92, which is an elastic member, is vulcanized and bonded to the fitting portion 91a and the side plate portion 91b.

  The seal rubber 92 is NBR (acrylonitrile-butadiene rubber), HNBR (hydrogenated acrylonitrile-butadiene rubber) excellent in heat resistance, EPDM (ethylene propylene rubber), ACM (polyacrylic rubber) excellent in heat resistance and chemical resistance, It is made of synthetic rubber such as FKM (fluoro rubber) or silicon rubber. The seal rubber 92 is formed with a radial lip 92a, an inner axial lip 92b, and an outer axial lip 92c which are seal lips. The seal rubber 92 is formed with an edge seal portion 92d so as to go around the fitting portion 91a of the cored bar 91.

  Thus, the inner side seal member 7 is disposed so that the slinger 8 and the seal ring 9 face each other. At this time, the radial lip 92a contacts the fitting portion 8a of the slinger 8 through the oil film. Further, the inner axial lip 92b contacts the side plate portion 8b of the slinger 8 through an oil film. The outer axial lip 92c also contacts the side plate portion 8b of the slinger 8 via the oil film. In this way, the inner side sealing member 7 prevents intrusion of muddy water and the like and prevents leakage of grease. The edge seal portion 92d is formed because water does not invade the fitting portion of the outer member 2 and the cored bar 91 (refers to the part where the outer member 2 and the cored bar 91 are in contact). It is taken into consideration.

  The outer side seal member 10 seals the outer side end portion of the annular space S formed between the outer member 2 and the inner member 3. The outer side seal member 10 is constituted by an annular seal ring 11.

  The seal ring 11 is fitted (internally fitted) to the enlarged diameter portion 2 b of the outer member 2. The seal ring 11 is composed of a core metal 111 and a seal rubber 112.

  The core metal 111 is a ferritic stainless steel plate (JIS standard SUS430 series, etc.), an austenitic stainless steel plate (JIS standard SUS304 series, etc.), or a rust-proof cold rolled steel plate (JIS standard SPCC system, etc.). It is configured. The cored bar 111 is formed in a shape in which a steel plate cut out in an annular shape is bent by pressing and the axial cross section is bent in a complicated manner. Thereby, the metal core 111 is formed with a cylindrical fitting portion 111a and a disk-shaped side plate portion 111b extending from one end thereof toward the inner member 3 (hub wheel 4). The fitting portion 111a and the side plate portion 111b intersect with each other while being curved, and the fitting portion 111a is press-fitted and fitted along the inner peripheral surface of the enlarged diameter portion 2b. The side plate portion 111b extends toward the inner member 3 (hub wheel 4) and faces the curved surface portion 4f and the side surface portion 4g of the hub wheel 4. Seal rubber 112, which is an elastic member, is vulcanized and bonded to the fitting portion 111a and the side plate portion 111b.

  Seal rubber 112 is NBR (acrylonitrile-butadiene rubber), HNBR (hydrogenated acrylonitrile-butadiene rubber) excellent in heat resistance, EPDM (ethylene propylene rubber), ACM (polyacrylic rubber) excellent in heat resistance and chemical resistance, It is made of synthetic rubber such as FKM (fluoro rubber) or silicon rubber. The seal rubber 112 is formed with a radial lip 112a, an inner axial lip 112b, and an outer axial lip 112c which are seal lips. Further, an edge seal portion 112d is formed on the seal rubber 112 so as to contact the inner periphery of the enlarged diameter portion 2b.

  Thus, the outer side seal member 10 is arrange | positioned so that the seal ring 11 and the hub ring 4 may oppose. At this time, the radial lip 112a contacts the shaft surface portion 4e of the hub wheel 4 through the oil film. Further, the axial lip 112b contacts the curved surface portion 4f of the hub wheel 4 through an oil film. The outer axial lip 112c also contacts the side surface portion 4g of the hub wheel 4 through the oil film. Thus, the outer side seal member 10 prevents intrusion of muddy water and the like and prevents leakage of grease. The edge seal portion 112d is formed because water does not invade the fitting portion of the outer member 2 and the core metal 111 (refers to the portion where the outer member 2 and the core metal 111 are in contact). It is taken into consideration.

  Next, the wheel bearing device 1 according to the first embodiment will be described in detail. FIG. 5 is a development view showing the main structure of the wheel bearing device 1. FIG. 6 is a cross-sectional view showing the main structure of the wheel bearing device 1. FIG. 7 is a cross-sectional view showing functions of the main structure of the wheel bearing device 1.

  In the wheel bearing device 1, the small diameter step portion 4a is provided with a locking portion 4b extending outward in the radial direction. The locking portion 4b is formed in a substantially disc shape by plastic deformation by the swing machining method. For this reason, the latching | locking part 4b is high hardness and high rigidity, and has contributed to high reliability. However, the locking portion 4b is another component, and may be attached to the tip of the small diameter step portion 4a.

  In addition, the wheel bearing device 1 includes an annular member 12 disposed between the locking portion 4b and the inner ring 5 in a state of being fitted to the small diameter step portion 4a. The annular member 12 has an elastic characteristic in the axial direction, and biases the inner ring 5 toward the outer side. The annular member 12 includes an inner side annular plate 121, an outer side annular plate 122, and a hard rubber 123 sandwiched between the two annular plates 121 and 122.

  The circular plate 121 is a ferritic stainless steel plate (JIS standard SUS430 series, etc.), an austenitic stainless steel plate (JIS standard SUS304 series, etc.), or a rust-proof cold rolled steel plate (JIS standard SPCC system, etc.). It consists of The annular plate 121 is provided with a non-slip process on the engaging part joining surface 12a which is a surface in contact with the engaging part 4b. Here, the anti-slip process is a process in which the surface roughness is higher than in other parts, and the slip resistance coefficient is increased by increasing the surface pressure at the minute convex part. In this regard, a structure may be employed in which concave and convex shapes are provided on both the locking portion 4b and the annular plate 121 so that the hub wheel 4 and the annular member 12 do not slip, and mesh with each other. Moreover, it is good also as applying the adhesive agent rather than giving a non-slip process, and adhere | attaching the latching | locking part 4b and the annular plate 121. FIG.

  The annular plate 122 is a ferritic stainless steel sheet (JIS standard SUS430 series, etc.), an austenitic stainless steel sheet (JIS standard SUS304 series, etc.), or a rust-proof cold rolled steel sheet (JIS standard SPCC system, etc.). It consists of The annular plate 122 is provided with a non-slip process on the inner ring joint surface 12 b which is a surface in contact with the inner ring 5. Here, the anti-slip process is a process in which the surface roughness is higher than in other parts, and the slip resistance coefficient is increased by increasing the surface pressure at the minute convex part. In this regard, a structure in which both the inner ring 5 and the annular plate 122 are provided with a concavo-convex shape so that the inner ring 5 and the annular member 12 do not slip may be engaged with each other. Alternatively, an adhesive may be applied to the inner ring 5 and the annular plate 122 instead of applying a non-slip process.

  Hard rubber 123 is NBR (acrylonitrile-butadiene rubber), HNBR (hydrogenated acrylonitrile-butadiene rubber) excellent in heat resistance, EPDM (ethylene propylene rubber), ACM (polyacrylic rubber) excellent in heat resistance and chemical resistance , FKM (fluoro rubber), or synthetic rubber such as silicon rubber.

  By the way, the wheel bearing device 1 has a contact point between the rolling element 6 and the outer rolling surface 2c as Pa, a contact point between the rolling element 6 and the inner rolling surface 5a as Pb, and a virtual line connecting the contact point Pa and the contact point Pb with Li. Then, the angular ball bearing which inclines to an outer side as the virtual line Li goes to radial direction outer side is comprised. Therefore, a load is applied to the rolling element 6 in parallel to the virtual line Li. In other words, according to the law of action and reaction, a load is applied to the outer rolling surface 2c and the inner rolling surface 5a in parallel to the virtual line Li (see arrows Fa and Fb in FIG. 6).

  In the wheel bearing device 1, the contact point between the rolling element 6 and the outer rolling surface 2d is Pc, the contact point between the rolling element 6 and the inner rolling surface 4d is Pd, and a virtual line connecting the contact Pc and the contact Pd is Lo. Then, the angular ball bearing which inclines to an inner side as the virtual line Lo goes to a radial direction outer side is comprised. Therefore, a load is applied to the rolling element 6 in parallel to the virtual line Lo. In other words, according to the law of action and reaction, a load is applied to the outer rolling surface 2d and the inner rolling surface 4d in parallel to the virtual line Lo (see arrows Fc and Fd in FIG. 6).

  In the wheel bearing device 1, when the component force in the axial direction of the load applied to the inner ring 5 (see arrow Fs in FIG. 7) exceeds the urging force by the annular member 12 (see arrow Fp in FIG. 7), The inner ring 5 slides toward the inner side. That is, the inner ring 5 slides toward the inner side against the urging force of the annular member 12 when an external force larger than expected and shock is applied (see arrow S in FIG. 7B). Thereby, a part of the load applied to the rolling element 6 is released, and the load applied to the rolling element 6 is reduced. Therefore, the load applied to the outer rolling surface 2c and the inner rolling surface 5a is also reduced (see arrows Fa and Fb in FIG. 7B). At this time, the load applied to the outer rolling surface 2d and the inner rolling surface 4d is also reduced (not shown). This means that the contact pressure between the outer rolling surfaces 2c and 2d and the inner rolling surfaces 5a and 4d is reduced.

  As described above, in the wheel bearing device 1 according to the first embodiment, the locking portion 4b that extends radially outward is provided in the small-diameter step portion 4a. Moreover, the annular member 12 arrange | positioned between the latching | locking part 4b and the inner ring | wheel 5 in the state fitted by the small diameter step part 4a is comprised. The annular member 12 has an elastic characteristic in the axial direction, and biases the inner ring 5 toward the outer side. According to such a wheel bearing device 1, when the inner ring 5 slides toward the inner side against the urging force of the annular member 12, the rolling elements 6 and the rolling surfaces (the outer rolling surfaces 2 c and 2 d and the inner rolling surface). The contact pressure of 5a and 4d) is reduced. Therefore, even when a large and shocking external force is applied, for example, when the wheel rides on the curb, the rolling elements 6 are placed on the rolling surfaces (the outer rolling surfaces 2c and 2d and the inner rolling surfaces 5a and 4d). Indentation can be prevented. As a result, no abnormal noise due to the indentation is generated, and a reduction in bearing life can be prevented.

  In the wheel bearing device 1, the annular member 12 includes an annular plate 121 in contact with the locking portion 4 b, and the locking portion joining surface 12 a of the annular plate 121 is subjected to a non-slip process or bonded. Applying agent. According to such a wheel bearing device 1, since the annular member 12 and the hub wheel 4 do not rotate relative to each other, it is possible to prevent wear at the mutual contact portion (referring to the portion where the annular member 12 and the hub wheel 4 are in contact). .

  Further, in the wheel bearing device 1, the annular member 12 includes an annular plate 122 in contact with the inner ring 5, and the inner ring joint surface 12 b of the annular plate 122 is subjected to a non-slip process or is coated with an adhesive. ing. According to the wheel bearing device 1, since the annular member 12 and the inner ring 5 do not rotate relative to each other, it is possible to prevent wear at a contact portion (referring to a portion where the annular member 12 and the inner ring 5 are in contact with each other).

  Next, the wheel bearing apparatus 1 which is 2nd embodiment is demonstrated in detail. FIG. 8 is a development view showing the main structure of the wheel bearing device 1.

  Also in the wheel bearing device 1, the small-diameter step portion 4a is provided with a locking portion 4b extending outward in the radial direction. The locking portion 4b is formed in a substantially disc shape by plastic deformation by the swing machining method. For this reason, the latching | locking part 4b is high hardness and high rigidity, and has contributed to high reliability. However, the locking portion 4b is another component, and may be attached to the tip of the small diameter step portion 4a.

  In addition, the wheel bearing device 1 also includes an annular member 22 disposed between the locking portion 4b and the inner ring 5 in a state of being fitted to the small diameter step portion 4a. The annular member 22 has an elastic characteristic in the axial direction and biases the inner ring 5 toward the outer side. More specifically, the annular member 22 is a wave spring 221.

  The wave spring 221 is a spring steel plate (JIS standard SUP series), martensitic stainless steel sheet (JIS standard SUS420 series, etc.), austenitic stainless steel sheet (JIS standard SUS304 series, etc.), or rust-proofed. It is composed of a cold rolled steel plate for springs (JIS standard SK series, SC series, etc.). The wave spring 221 is provided with a non-slip process on the engaging part joining surface 22a which is a surface in contact with the engaging part 4b. Further, the wave spring 221 is also provided with a non-slip process on an inner ring joint surface (not shown) which is a surface in contact with the inner ring 5.

  With such a structure, also in the wheel bearing device 1 according to the second embodiment, the small diameter step portion 4a is provided with a locking portion 4b extending outward in the radial direction. Moreover, the annular member 22 arrange | positioned between the latching | locking part 4b and the inner ring | wheel 5 in the state fitted by the small diameter step part 4a is comprised. The annular member 22 has an elastic characteristic in the axial direction, and biases the inner ring 5 toward the outer side. According to the wheel bearing device 1, when the inner ring 5 slides toward the inner side against the urging force of the annular member 22, the rolling elements 6 and the rolling surfaces (the outer rolling surfaces 2 c and 2 d and the inner rolling surface). The contact pressure of 5a and 4d) is reduced. Therefore, even when a large and shocking external force is applied, for example, when the wheel rides on the curb, the rolling elements 6 are placed on the rolling surfaces (the outer rolling surfaces 2c and 2d and the inner rolling surfaces 5a and 4d). Indentation can be prevented. As a result, no abnormal noise due to the indentation is generated, and a reduction in bearing life can be prevented.

  Further, in the wheel bearing device 1, the annular member 22 includes an annular plate 221 in contact with the locking portion 4 b, and the locking portion joining surface 22 a of the annular plate 221 is subjected to a non-slip process or bonded. Applying agent. According to such a wheel bearing device 1, since the annular member 22 and the hub wheel 4 do not rotate relative to each other, it is possible to prevent wear at the mutual contact portion (referring to the portion where the annular member 22 and the hub wheel 4 are in contact). .

  Further, in the wheel bearing device 1, the annular member 22 includes an annular plate 222 in contact with the inner ring 5, and the inner ring joint surface (not shown) of the annular plate 222 is subjected to a non-slip process or bonded. Applying agent. According to the wheel bearing device 1, since the annular member 22 and the inner ring 5 do not rotate relative to each other, it is possible to prevent wear at the mutual contact portion (referring to a portion where the annular member 22 and the inner ring 5 are in contact).

  Next, the wheel bearing apparatus 1 which is 3rd embodiment is demonstrated in detail. FIG. 9 is a development view showing the main structure of the wheel bearing device 1.

  Also in the wheel bearing device 1, the small-diameter step portion 4a is provided with a locking portion 4b extending outward in the radial direction. The locking portion 4b is formed in a substantially disc shape by plastic deformation by the swing machining method. For this reason, the latching | locking part 4b is high hardness and high rigidity, and has contributed to high reliability. However, the locking portion 4b is another component, and may be attached to the tip of the small diameter step portion 4a.

  In addition, the wheel bearing device 1 also includes an annular member 32 disposed between the locking portion 4b and the inner ring 5 in a state of being fitted to the small diameter step portion 4a. The annular member 32 has an elastic characteristic in the axial direction, and biases the inner ring 5 toward the outer side. More specifically, the annular member 32 is a disc spring 321.

  The disc spring 321 is a spring steel plate (JIS standard SUP series), martensitic stainless steel sheet (JIS standard SUS420 series, etc.), austenitic stainless steel sheet (JIS standard SUS304 series, etc.), or rust-proofed. It is composed of a cold rolled steel plate for springs (JIS standard SK series, SC series, etc.). The disc spring 321 is provided with a non-slip process on the engaging part joining surface 32a which is a surface in contact with the engaging part 4b. The disc spring 321 is also provided with a non-slip process on an inner ring joint surface (not shown) which is a surface in contact with the inner ring 5.

  With such a structure, also in the wheel bearing device 1 according to the third embodiment, the small-diameter step portion 4a is provided with a locking portion 4b extending outward in the radial direction. Moreover, the annular member 32 arrange | positioned between the latching | locking part 4b and the inner ring | wheel 5 in the state fitted by the small diameter step part 4a is comprised. The annular member 32 has an elastic characteristic in the axial direction, and biases the inner ring 5 toward the outer side. According to the wheel bearing device 1, when the inner ring 5 slides toward the inner side against the urging force of the annular member 32, the rolling elements 6 and the rolling surfaces (the outer rolling surfaces 2 c and 2 d, the inner rolling surface). The contact pressure of 5a and 4d) is reduced. Therefore, even when a large and shocking external force is applied, for example, when the wheel rides on the curb, the rolling elements 6 are placed on the rolling surfaces (the outer rolling surfaces 2c and 2d and the inner rolling surfaces 5a and 4d). Indentation can be prevented. As a result, no abnormal noise due to the indentation is generated, and a reduction in bearing life can be prevented.

  In the wheel bearing device 1, the annular member 32 includes an annular plate 321 that is in contact with the locking portion 4 b, and the locking portion joining surface 32 a of the annular plate 321 is subjected to a non-slip process or bonded. Applying agent. According to such a wheel bearing device 1, since the annular member 32 and the hub wheel 4 do not rotate relative to each other, it is possible to prevent wear at the mutual contact portion (referring to the portion where the annular member 32 and the hub wheel 4 are in contact). .

  Further, in the wheel bearing device 1, the annular member 32 includes an annular plate 322 in contact with the inner ring 5, and the inner ring joint surface (not shown) of the annular plate 322 is subjected to anti-slip processing or bonded. Applying agent. According to the wheel bearing device 1, since the annular member 32 and the inner ring 5 do not rotate relative to each other, it is possible to prevent wear at the mutual contact portion (referring to a portion where the annular member 32 and the inner ring 5 are in contact).

  Next, the feature point applied to the wheel bearing device 1 which is each embodiment is demonstrated. 10 is a cross-sectional view taken along the line BB in FIG.

  The wheel bearing device 1 is provided with a key 4j parallel to the rotation axis L on the outer periphery of the small-diameter step portion 4a. The key 4j is inserted along a key groove 5b provided on the inner periphery of the inner ring 5. Therefore, the inner ring 5 is slidable in the axial direction but cannot rotate in the circumferential direction. The wheel bearing device 1 employs key / key groove fitting, but may be another assembly structure such as spline fitting.

  As described above, in the wheel bearing device 1 according to the present invention, the inner ring 5 is fitted to the hub wheel 4 via an assembly structure that cannot rotate in the circumferential direction. According to such a wheel bearing device 1, the inner ring 5 and the hub ring 4 do not rotate relative to each other, and therefore, wear at each contact portion (referring to a portion where the inner ring 5 and the hub ring 4 are in contact) can be prevented.

DESCRIPTION OF SYMBOLS 1 Wheel bearing apparatus 2 Outer member 2c Outer rolling surface 2d Outer rolling surface 3 Inner member 4 Hub wheel 4a Small diameter step part 4b Locking part 4d Inner rolling surface 5 Inner ring 5a Inner rolling surface 6 Rolling body 6a Ball train 6b Ball train 12 Annular member 121 Annular plate 12a Engagement part joining surface 122 Annular plate 12b Inner ring joining surface 123 Hard rubber S Gap L Rotating shaft

Claims (4)

An outer member having a double row outer raceway formed on the inner periphery;
A hub wheel having a small-diameter step portion extending in the axial direction, and at least one inner ring fitted to the small-diameter step portion of the hub wheel, and having a double row facing the outer rolling surface of the double row on the outer periphery. An inner member formed with an inner rolling surface;
In a wheel bearing device comprising: a double-row rolling element interposed between the rolling surfaces of the outer member and the inner member so as to freely roll.
The small diameter step is provided with a locking portion that extends radially outward,
An annular member disposed between the locking portion and the inner ring in a state of being fitted to the small-diameter stepped portion;
The wheel bearing device according to claim 1, wherein the annular member has an elastic characteristic in an axial direction and biases the inner ring toward the outer side.   The annular member includes an annular plate that is in contact with the engaging portion, and is provided with a non-slip process or an adhesive applied to the engaging portion joining surface of the annular plate. The wheel bearing device according to claim 1.   The annular member includes an annular plate that is in contact with the inner ring, and an anti-slip process is applied to the inner ring joint surface of the annular plate or an adhesive is applied thereto. The wheel bearing device described.   The wheel according to any one of claims 1 to 3, wherein the inner ring is fitted via an assembly structure that is not rotatable in the circumferential direction with respect to the hub wheel. Bearing device.

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