JP2008138837A - Shell type roller bearing and shell type roller bearing structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a shell type roller bearing for preventing deformation and a crack in press-in, while extending the service life. <P>SOLUTION: This shell type roller bearing 21 includes a drawn cup 22 having collar parts 26a and 26b having both end parts bent to the inner diameter side, a roller 23 arranged along an inner diameter surface 25a of the drawn cup 22, and a cage 24 holding the roller 23. The drawn cup 22 has a nitrogen enriched layer on its outer peripheral surface, and is set to 25 capacity % or more in a residual austenite quantity of the nitrogen enriched layer of the drawn cup 22. Assuming a length dimension in the radial direction between a projecting part 28 most projected in the radial direction among a width surface 27a of the collar part 26a and an outer diameter surface 25b of the drawn cup 22 as D and the plate thickness of the drawn cup 22 as T, the shell type roller bearing has the relationship of D/T ≤2.1. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a shell-type roller bearing and a shell-type roller bearing structure, and more particularly to a shell-type roller bearing that is press-fitted into a press-fitting hole and a shell-type roller bearing structure that includes such a shell-type roller bearing.

  Conventionally, as roller bearings used in transmissions, compressors for car air conditioners, starters, etc., shell roller bearings that are capable of receiving heavy loads and are inexpensive even though the bearing projection area is small have been used. It was. Such a shell-type roller bearing includes a shell-type outer ring, a plurality of rollers arranged along an inner diameter surface that is a rolling surface of the shell-type outer ring, and a cage that holds the plurality of rollers.

  Here, the manufacturing method of the conventional shell-type roller bearing will be briefly described. FIG. 8 is a schematic view showing an example of a conventional method for manufacturing a shell roller bearing. Referring to FIG. 8, first, a flat steel plate 101, which is a material of a shell-shaped outer ring, is deep drawn and formed into a cup shape, and then the bottom portion of the cup is punched to form one flange 102. Thereafter, the rolling surface 103 is processed, and the whole is subjected to quenching such as carburizing and quenching. Here, in order to perform the quenching process once in the state of punching the bottom portion of the cup, before performing the edge bending process of the flange 107 on the inlet side of the cup, the edge bending part 104 is subjected to a carburizing treatment and an annealing process, Avoid cracks even when edge bending is performed. Next, the roller 105 and the cage 106 are put, and the edge bent portion 104 on the inlet side of the cup is edge bent to form the other flange 107. Thereafter, a shell-type roller bearing is manufactured through a process such as cleaning.

  As a material for the roller to be incorporated, SUJ bearing steel is generally used, and it has residual austenite so that it gradually decreases from the surface layer to the inside, and the amount is generally about 15% by volume at the maximum. It is. As a result, the surface hardness of the roller is about 700 to 750 in terms of Vickers hardness (Hv). The shell-shaped outer ring is made of case-hardened steel such as SCM415, and the cage material to be incorporated is an ordinary cold-rolled steel plate (for example, SPCC). It is improving.

  Among the shell-type roller bearings manufactured as described above, the strength of the shell-type outer ring is different between one flange and the other flange, that is, one flange portion and the other flange portion. Specifically, the strength of the collar part bent in the subsequent process is weaker than that of the other collar part. Then, when the shell-type roller bearing is press-fitted into the press-fitting hole provided in the housing or the like, it is necessary to press-fit the high-strength flange portion in order to prevent damage to the flange portion of the shell-type outer ring.

According to Japanese Patent Application Laid-Open No. 11-303863 (Patent Document 1), the direction of the shell-shaped outer ring is eliminated by making both ends of the shell-shaped outer ring smaller than the diameter of the circular hole of the housing. Thus, a shell-type roller bearing that can be press-fitted from any flange side is provided.
Japanese Patent Laid-Open No. 11-303863

  When the shell-type roller bearing is press-fitted into the press-fitting hole of the housing, it is generally press-fitted using a press-fitting press or a press-fitting jig. Here, a method for press-fitting the shell roller bearing into the press-fitting hole of the housing will be briefly described.

  FIG. 9 is a schematic cross-sectional view showing a state in which a shell-type roller bearing is press-fitted into a press-fitting hole of a housing using a press-fitting jig. Referring to FIG. 9, the press-fitting jig 111 includes a base portion 112 and a push jig 113 that can move in the direction of arrow X in FIG. 9. First, the housing 116 provided with the press-fitting holes 117 is installed on the base portion 112. One opening portion of the press-fitting hole 117 is provided with a shoulder portion 118 extending toward the inner diameter side, and in this case, the shoulder portion 118 is disposed on the lower side. Next, the shell-shaped roller bearing 121 including the shell-shaped outer ring 122, the roller 123, and the cage 124 is disposed above the press-fitting hole 117. Thereafter, the pushing jig 113 is brought into contact with the width surface 126b of one flange 125b of the shell-shaped outer ring 122, and the pushing jig 113 is pushed in the direction of arrow X in FIG. 9 by a press-fitting press (not shown). . And the width surface 126a of the other collar part 125a contacts with the shoulder part 118, and it pushes off until the shell-shaped roller bearing 121 is completely press-fitted. In this way, the shell roller bearing 121 is press-fitted into the press-fitting hole 117.

  Here, the lower limit value of the pressure input by the press-fitting press needs to be equal to or greater than the calculated maximum pressure input derived by the following equation.

Pressure input = Friction coefficient × Fitting portion area × Fitting portion surface pressure The fitting portion is a portion to be fitted when the shell-type roller bearing 121 is press-fitted into the press-fitting hole 117.

  Further, regarding the upper limit value of the press input by press-fitting press, when the press-fitting, specifically, when the collar part and the shoulder part come into contact with each other and cut, the shell-type roller bearing 121 and the housing 116 are not damaged. It is necessary to do the following. The pressing load capacity is a load that does not cause deformation or cracking of the shell roller bearing, damage to the housing, etc. when the shell roller bearing abuts against the housing during press-fitting and is further pressed under load. Say.

  Here, if the pressing load resistance of the shell roller bearing 121 is not stable, the shell roller bearing 121 may be deformed or cracked or the housing 116 may be damaged depending on the pressure input of the press-fitting press. Become. Such a shell-type roller bearing structure having a defect at the time of press-fitting cannot properly exert a bearing function.

  As shown in FIG. 10, the press-fitting hole 132 provided in the housing 131 does not penetrate, and a bottom 133 is provided instead of the shoulder, and the bottom surface 134 of the bottom 133 and the width surface 126b of the flange 125b. The same applies to the case where the abuts.

  Furthermore, as described above, the shell-shaped outer ring has a portion with low hardness. In addition, since the heat history of the shell-shaped outer ring in the manufacturing process is increased, the roundness may be deteriorated. A shell-type roller bearing including such a shell-type outer ring cannot have a long life.

  An object of the present invention is to provide a shell-type roller bearing that has a long life and prevents deformation and cracking during press-fitting.

  Another object of the present invention is to provide a shell-type roller bearing structure capable of achieving a long life and appropriately exhibiting a bearing function.

  The shell-type roller bearing according to the present invention includes a shell-type outer ring having a flange portion whose both ends are bent toward the inner diameter side, and a roller arranged along the inner diameter surface of the shell-type outer ring. The shell-type outer ring has a nitrogen-enriched layer on its outer peripheral surface, and the residual austenite amount of the nitrogen-enriched layer of the shell-type outer ring is 25% by volume or more. Further, if the length dimension in the radial direction between the protruding portion that protrudes most in the axial direction in the width surface of the flange portion and the outer diameter surface of the shell-shaped outer ring is D, and the plate thickness of the shell-shaped outer ring is T, D / T ≦ 2.1.

  By doing so, the necessary hardness can be secured for the shell-shaped outer ring which is a constituent member of the shell-shaped roller bearing. If it does so, the long life of a shell type roller bearing can be aimed at. Further, when the shell-type roller bearing is press-fitted into the press-fitting hole of the housing, first, the protruding portion of the shell-type outer ring comes into contact with the housing. Therefore, this protrusion becomes a power point, and a pressing load is applied from the press. Here, with the dimensional relationship described above, the power point can be positioned on the outer diameter side of the shell-shaped outer ring having high axial rigidity. In this way, it is possible to stabilize the pressing load resistance of the shell-type roller bearing and prevent deformation and cracking of the shell-type roller bearing during press-fitting. Furthermore, damage to the housing can be prevented.

  Preferably, the angle at which the end is bent is 90 ° or more. By doing so, the flange portion can be bent to the bearing inner side. If it does so, an edge part will not contact | abut to a shoulder part. Therefore, deformation and cracking of the shell-type roller bearing at the time of press-fitting can be prevented.

  More preferably, the thickness of the nitrogen-enriched layer of the shell-shaped outer ring may be 0.05 mm or more.

  Further, the hardness of the flanges at both ends of the shell-shaped outer ring is uniform. By doing so, since it does not have a part with low hardness partially, it is possible to extend the life and increase the strength of the collar.

  More preferably, the roller has a nitrogen-enriched layer on the surface portion thereof, and the amount of retained austenite of the nitrogen-enriched layer of the roller is 20% by volume or more. By doing so, the hardness of the surface of the roller can be ensured, so that the occurrence of indentation due to the mixed foreign matter can be reduced, and a longer life can be achieved.

  More preferably, the thickness of the nitrogen-enriched layer of the roller may be 0.1 mm or more, and the surface hardness of the roller may be 750 or more in terms of Vickers hardness (Hv). By prescribing in this way, the surface hardness of the roller can be ensured and a longer life can be achieved.

  More preferably, the shell-type roller bearing includes a cage that holds the roller. Here, the cage has a nitrogen-enriched layer on its surface, and the surface hardness of the cage is 750 or more in terms of Vickers hardness (Hv). By doing so, the retainer included in the shell-type roller bearing can also ensure the hardness, so that a long life can be achieved.

  The shell-type roller bearing includes a shell-type outer ring having a flange portion whose both ends are bent toward the inner diameter side, and a roller arranged along the inner diameter surface of the shell-type outer ring. The shell-type outer ring has a nitrogen-enriched layer on its outer peripheral surface, and the residual austenite amount of the nitrogen-enriched layer of the shell-type outer ring is 25% by volume or more. Further, assuming that the radius of curvature of the bent portion formed when the end portion is bent is R and the plate thickness of the shell-shaped outer ring is T, the relationship is R / T ≦ 1.6.

  By doing so, the necessary hardness can be secured for the shell-shaped outer ring which is a constituent member of the shell-shaped roller bearing. If it does so, the long life of a shell type roller bearing can be aimed at. In addition, by setting the curvature radius of the bent portion and the plate thickness of the shell-shaped outer ring to the above-described dimensional relationship, the power point can be positioned on the outer diameter side of the shell-shaped outer ring having high axial rigidity. Accordingly, it is possible to stabilize the pressing load resistance of the shell-type roller bearing and prevent deformation and cracking of the shell-type roller bearing during press-fitting. Furthermore, damage to the housing can be prevented.

  In another aspect of the present invention, a shell-type roller bearing structure includes any of the above-described shell-type roller bearings and a housing including a press-fit hole for press-fitting the shell-type roller bearing.

  Such a shell-type roller bearing structure has a long life and can prevent deformation and cracking of the shell-type roller bearing during press-fitting and damage to the housing. can do.

  According to this invention, the required hardness can be ensured for the shell-shaped outer ring, which is a constituent member of the shell-shaped roller bearing. If it does so, the long life of a shell type roller bearing can be aimed at. When the shell-type roller bearing is press-fitted into the press-fitting hole of the housing, first, the protruding portion of the shell-type outer ring comes into contact with the housing. Therefore, this protrusion becomes a power point, and a pressing load is applied from the press. Here, with the dimensional relationship described above, the power point can be positioned on the outer diameter side of the shell-shaped outer ring having high axial rigidity. In this way, it is possible to stabilize the pressing load resistance of the shell-type roller bearing and prevent deformation and cracking of the shell-type roller bearing during press-fitting. Furthermore, damage to the housing can be prevented.

  Moreover, the required hardness can be ensured for the shell-shaped outer ring which is a constituent member of the shell-shaped roller bearing. If it does so, the long life of a shell type roller bearing can be aimed at. Further, by setting the radius of curvature of the bent portion and the plate thickness of the shell-shaped outer ring to the above-described dimensional relationship, the power point can be positioned on the outer diameter side of the shell-shaped outer ring having high axial rigidity. Accordingly, it is possible to stabilize the pressing load resistance of the shell-type roller bearing and prevent deformation and cracking of the shell-type roller bearing during press-fitting. Furthermore, damage to the housing can be prevented.

  In addition, such a shell-type roller bearing structure has a long life and can prevent deformation and cracking of the shell-type roller bearing during press-fitting and damage to the housing. Can be demonstrated.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 is a schematic sectional view showing a shell-type roller bearing structure according to one embodiment of the present invention. FIG. 1 is an enlarged view of a portion I shown in FIG. Referring to FIGS. 1 and 2, shell-type roller bearing structure 11 includes a housing 12 including a press-fit hole 13 into which shell-type roller bearing 21 is press-fitted, and shell-type roller bearing 21 to be press-fitted into press-fit hole 13. Prepare. The press-fitting hole 13 passes through the housing 12, and a shoulder portion 14 extending toward the inner diameter side is provided on one opening side.

  The shell roller bearing 21 includes a shell outer ring 22, a plurality of rollers 23, and a cage 24 that holds the plurality of rollers 23. The rollers 23 and the cage 24 are arranged along the inner diameter surface 25a of the shell-shaped outer ring 22. The shell-shaped outer ring 22 has flange portions 26a and 26b whose both end portions are bent toward the inner diameter side. The shell roller bearing 21 is pressed into the press-fitting hole 13 by pressing the width surface 27b side of the flange portion 26b by, for example, a press-fitting press or a press-fitting jig (not shown) having the above-described configuration. The shell-shaped roller bearing 21 including the shell-shaped outer ring 22, the roller 23, and the cage 24 is manufactured by a method described later.

  Here, the length dimension in the radial direction between the protruding portion 28 that protrudes most in the axial direction of the width surface 27a of the flange portion 26a and the outer diameter surface 25b of the shell-shaped outer ring 22 is D, and the thickness of the shell-shaped outer ring 22 is T. Then, D / T ≦ 2.1.

  When the shell-type roller bearing 21 having such a configuration is press-fitted into the press-fitting hole 13, the protruding portion 28 of the shell-type outer ring 22 and the inner surface 15 of the shoulder portion 14 of the housing 12 contact each other. Touch. Therefore, this part becomes a power point, and a pressing load by the press-fitting press is applied. Here, with the dimensional relationship described above, it is possible to position the power point on the outer diameter side of the shell-shaped outer ring 22 having high axial rigidity. In this way, it is possible to stabilize the pressing load resistance and prevent deformation and cracking of the shell-shaped roller bearing 21 and damage to the housing 12 during press-fitting.

  The angle at which the end 29 is bent is 90 ° or more. That is, the flange portion 26a is inclined to the bearing inner side. By doing so, the flange portion 26a can be bent to the inside of the bearing. As a result, the end 29 does not contact the surface 15 of the shoulder 14. Therefore, it is possible to further prevent deformation and cracking of the shell-shaped roller bearing 21 and damage to the housing 12 during press-fitting.

  In addition, like the shell-type roller bearing 41 shown in FIG. 3, the flange portion 43 of the shell-shaped outer ring 42 is inclined to the outside of the bearing, and the protrusion 44 and the plate thickness T of the shell-shaped outer ring 42 are the above-mentioned. When the relationship is not provided, specifically, when the relationship of D / T> 2.1 is established, the shell-shaped roller bearing 41 is deformed or cracked during press-fitting and the housing 12 is damaged.

  In the above embodiment, the relationship between the length D in the radial direction between the protruding portion and the outer diameter surface and the plate thickness T is the above-described dimensional relationship. You may decide to prescribe | regulate the relationship between the curvature radius R and board thickness T of the bending part at the time of bending to an internal diameter side.

  FIG. 4 is a sectional view showing a part of the shell-type roller bearing structure in this case, and corresponds to FIG. Referring to FIG. 4, shell-shaped roller bearing structure 51 includes housing 12 and shell-shaped roller bearing 52 as in FIG. 1. The shell-type roller bearing 52 is also manufactured by the method described later. Here, assuming that the radius of curvature of the bent portion 55 formed when the end portion 58 is bent is R and the plate thickness of the shell-shaped outer ring 53 is T, R / T ≦ 1.6.

  In the shell roller bearing 52 having such a configuration, the abutment portion 57 located closest to the outer diameter side of the width surface 56 of the flange portion 54 serves as a power point. Therefore, a pressing load is applied to this power point. Here, with the dimensional relationship described above, it is possible to position the power point on the outer diameter side of the shell-shaped outer ring 53 having a strong axial rigidity. In this way, it is possible to stabilize the pressing load resistance and prevent deformation and cracking of the shell-type roller bearing 52 and damage to the housing 12 during press-fitting.

  In the case where the relationship between the plate thickness T of the shell-shaped outer ring 62 and the radius of curvature R of the bent portion 64 forming the flange 63 does not have the above relationship, as in the case of the shell-type roller bearing 61 shown in FIG. Specifically, when the radius of curvature R is large and R / T> 1.6, the shell-type roller bearing 61 is deformed or cracked during press-fitting and the housing 12 is damaged.

  Here, FIG. 6 and Table 1 show the above-described dimensional relationship, that is, the relationship between D / T and R / T and the pressing load resistance / maximum pressure input.

  In Table 1, F represents the pressing load resistance (Kgf), and Fmax represents the maximum pressure input (Kgf). In FIG. 6, the vertical axis indicates D / T, the horizontal axis indicates R / T, and the hatched portion indicates a region where the pressing load resistance / maximum pressure input is smaller than 1.2.

  Referring to Table 1 and FIG. 6, in the portion where D / T ≦ 2.1 or the portion where R / T ≦ 1.6, the pressing load resistance / maximum pressure input is 1.2 or more. If it does so, in the shell type roller bearing of the above-mentioned composition, the pressing load resistance can be 1.2 or more of the maximum pressure input. Therefore, the shell-type roller bearing having such a configuration can guarantee 120% of the maximum pressure input as the pressing load resistance value.

  Next, a method for manufacturing the shell roller bearing having the above-described configuration will be described. First, about a roller, a wire (SUJ2 steel) is cut | disconnected, drop type end surface molding is performed, and a tumbler process is performed. Thereafter, quenching and tempering are performed, outer diameter grinding is performed, and then an outer shape super treatment is performed. In addition, about the heat processing conditions of a roller, oil quenching is performed for 30 minutes at 840 degreeC, and then tempering for 90 minutes is performed at 180 degreeC. Finally, select the dimensions and get the rollers.

  About a cage, the cross-sectional shape of a strip steel (SPC) is shape | molded and a pocket removal process is performed. Thereafter, it is cut, bent into a cylindrical shape, welded, etc. to obtain a cage.

  For the shell-shaped outer ring, a steel strip (SCM415) is deep drawn and formed into a cup shape, and then the bottom portion of the cup is punched to form one flange. Thereafter, the rolling surface is processed, the roller and the cage obtained by the above-described manufacturing method are put, and the edge bent portion on the inlet side of the cup is edge bent to form the other flange. Here, when forming a flange, ie, a collar part, it forms so that it may become the above-mentioned dimensional relationship. Thereafter, carbonitriding is performed, and quenching and tempering are performed. Here, regarding the conditions of carbonitriding treatment, in a carbonitriding atmosphere (1 to 3% by volume of ammonia added to RX gas), carbonitriding was carried out by holding at 840 to 850 ° C. for 30 minutes, and then immediately after oil quenching I do. In this way, the shell roller bearing having the above-described configuration is manufactured.

  According to such a manufacturing method, since the thermal history of the shell-shaped outer ring is reduced, the roundness is good. Moreover, the hardness of the collar part of both ends becomes uniform among the shell type outer rings. Therefore, it is possible to extend the life and increase the strength of the collar portion.

  Here, the lifespan of the shell type roller bearing manufactured by the conventional manufacturing method was compared. As a conventional manufacturing method, what was manufactured in the following procedures is shown.

  First, about a roller, a wire (SUJ2 steel) is cut | disconnected, drop type end surface molding is performed, and a tumbler process is performed. Then, quenching and tempering are performed, and after grinding the outer diameter, polishing is performed. In addition, about the heat processing conditions of a roller, oil quenching is performed for 30 minutes at 840 degreeC, and then tempering for 90 minutes is performed at 180 degreeC. Finally, select the dimensions and get the rollers.

  About a cage, the cross-sectional shape of a strip steel (SPC) is shape | molded and a pocket removal process is performed. Thereafter, it is cut, bent into a cylindrical shape, welded, etc. to obtain a cage. The cage is subjected to soft nitriding treatment at 570 to 580 ° C. for 35 minutes.

  For the shell-shaped outer ring, a steel strip (SCM415) is deep drawn and formed into a cup shape, and then the bottom portion of the cup is punched to form one flange. Thereafter, it was kept at 840 to 890 ° C. for 60 minutes and carburized (in an RX gas atmosphere), quenched in oil, and then tempered at 165 ° C. for 60 minutes. Moreover, the annealing process of one collar part was performed by the high frequency heating.

  Thereafter, the roller and cage obtained by the above-described manufacturing method are put into the obtained shell-shaped outer ring, and the flange portion is edge-bent radially inward to manufacture a shell-shaped roller bearing.

  The properties of the obtained product of the present invention and the conventional product are shown in Table 2 together with roundness and life. The evaluation criteria for roundness and life are as follows. Moreover, the bearing used for the test was an open-end shell needle roller bearing, and a bearing having an inner diameter of 15 mm, an outer diameter of 23 mm, and a width of 16 mm was used. The product of the present invention and the conventional product have the same dimensions.

  (Roundness) Roundness of the outer peripheral surface of the shell-shaped outer ring that was formed last by edge bending (measured at a position of 12.7 mm based on the end surface of the first press-molded flange) The degree was measured using a Talironde, and the ratio when the conventional product was set to 1 was determined.

  (Life) A fatigue life test was performed under the following conditions and compared with a conventional product.

Rotation speed: 5000rpm
Radial load: 572kgf

  From Table 2, the roundness of the product of the present invention is improved as compared with the conventional product. Moreover, the lifetime is also prolonged.

  As described above, the shell-type roller bearing configured as described above has a long life and can prevent deformation and cracking of the shell-type roller bearing during press-fitting and damage to the housing. Moreover, the shell-type roller bearing structure having the above-described configuration can achieve a long life and appropriately exhibit a bearing function.

  The housing provided in the shell-type roller bearing structure having such a configuration may be used as the throttle body of the throttle valve device. FIG. 7 is a schematic sectional view showing an example of the throttle valve device in this case. Referring to FIG. 7, a throttle valve device 91 that controls the amount of air flowing into an automobile engine or the like includes a throttle body 94 that forms an intake passage therein, a throttle blade 95 that adjusts the intake amount by opening and closing, and a throttle A throttle shaft 93 that fixes the blade 95 and a shell roller bearing 92 that rotatably supports the throttle shaft 93 are provided. Here, the shell-type roller bearing 92 is used as a bearing for supporting the throttle shaft 93 because the outer diameter of the bearing is smaller than that of a ball bearing or the like, and a seal with high sealing performance can be incorporated inside. By having air leakage prevention performance.

  The throttle valve device 91 rotates the throttle shaft 93 with a wire, a motor (not shown) or the like via a gear, thereby opening and closing the throttle blade 95 and adjusting the intake air amount. The shell roller bearing 92 is press-fitted into a press-fitting hole provided in the throttle body 94 and fixed.

  Here, since the shell-type roller bearing 92 has the above-described configuration, when the housing is the throttle body 94, the shell-type roller bearing 92, specifically, when press-fitting into the press-fitting hole of the throttle body 94, Deformation and cracking of the shell-shaped outer ring included in the shell-shaped roller bearing, damage to the throttle body 94, and the like can be prevented.

  Moreover, a scroll compressor, a starter, etc. provided with the shell type roller bearing of an above-described structure can also be applied as a shell type roller bearing structure.

  In the above-described embodiment, with respect to the measurement of the withstand load, etc., a reference ring may be prepared as a housing having a press-fitting hole, and a shell-type roller bearing may be press-fitted into the reference ring.

  In the above embodiment, the shell roller bearing has a cage. However, the present invention is not limited to this, and the shell roller bearing is a so-called full-roller type shell roller bearing without a cage. There may be.

  As mentioned above, although embodiment of this invention was described with reference to drawings, this invention is not limited to the thing of embodiment shown in figure. Various modifications and variations can be made to the illustrated embodiment within the same range or equivalent range as the present invention.

  The shell type roller bearing according to the present invention is required to have a long life and is effectively used for a shell type roller bearing of a type that is press-fitted into a press-fitting hole.

  The shell type roller bearing structure according to the present invention is required to have a long life, and is effectively used for a shell type roller bearing structure of a type in which a shell type roller bearing is press-fitted into a press-fitting hole of a housing.

It is an expanded sectional view showing a part of shell type roller bearing structure concerning one embodiment of this invention. It is a schematic sectional drawing which shows the shell type roller bearing structure which concerns on one Embodiment of this invention. It is an expanded sectional view showing a part of shell type roller bearing structure when not having the relation of D / T <= 2.1. It is an expanded sectional view showing a part of shell type roller bearing structure concerning other embodiments of this invention. It is an expanded sectional view showing a part of shell type roller bearing structure when not having the relation of R / T <= 1.6. It is a graph which shows the relationship between D / T and R / T, and a pressing load-proof load / maximum pressure input. It is a schematic sectional drawing which shows a throttle valve apparatus. It is process schematic in the case of manufacturing the conventional shell type roller bearing. It is a schematic sectional drawing which shows the state which press-fits a shell-shaped roller bearing in the housing which has a shoulder part with a press-fitting jig. It is a schematic sectional drawing which shows the state which press-fits a shell-shaped roller bearing in the housing which has a bottom part with a press-fitting jig.

Explanation of symbols

  11, 51 Shell type roller bearing structure, 12 housing, 13 press-fitting hole, 14 shoulder, 15 surfaces, 21, 41, 52, 61, 92 shell type roller bearing, 22, 42, 53, 62 shell type outer ring, 23 Roller, 24 cage, 25a inner diameter surface, 25b outer diameter surface, 26a, 26b, 43, 54, 63 collar, 27a, 27b, 56 width surface, 28, 44 protrusion, 29, 58 end, 55, 64 folding Bending part, 57 contact part, 91 throttle valve device, 93 throttle shaft, 94 throttle body, 95 throttle blade.

Claims (10)

A shell-shaped outer ring having a collar portion whose both ends are bent toward the inner diameter side;
A shell-type roller bearing including a roller disposed along an inner diameter surface of the shell-shaped outer ring,
The shell-shaped outer ring has a nitrogen-enriched layer on its outer peripheral surface,
The amount of retained austenite of the nitrogen-enriched layer of the shell-shaped outer ring is 25% by volume or more,
When the length dimension in the radial direction of the projecting portion that protrudes most in the axial direction in the width surface of the flange portion and the outer diameter surface of the shell-shaped outer ring is D, and the plate thickness of the shell-shaped outer ring is T
A shell type roller bearing having a relationship of D / T ≦ 2.1. The shell-type roller bearing according to claim 1, wherein an angle at which the end portion is bent is 90 ° or more. The shell type roller bearing according to claim 1 or 2, wherein the thickness of the nitrogen-enriched layer of the shell type outer ring is 0.05 mm or more. The shell-type roller bearing according to claim 1, wherein the hardness of the flanges at both ends of the shell-shaped outer ring is uniform. The roller has a nitrogen-enriched layer on its surface layer,
The shell type roller bearing according to any one of claims 1 to 4, wherein the amount of retained austenite of the nitrogen-enriched layer of the roller is 20% by volume or more. The shell-type roller bearing according to any one of claims 1 to 5, wherein a thickness of the nitrogen-enriched layer of the roller is 0.1 mm or more. The shell-type roller bearing according to any one of claims 1 to 6, wherein the surface hardness of the roller is 750 or more in terms of Vickers hardness (Hv). The shell-type roller bearing includes a cage that holds the roller,
The cage has a nitrogen-enriched layer on its surface;
The shell-type roller bearing according to any one of claims 1 to 7, wherein the surface hardness of the cage is 750 or more in terms of Vickers hardness (Hv). A shell-shaped outer ring having a collar portion whose both ends are bent toward the inner diameter side;
A shell-type roller bearing including a roller disposed along an inner diameter surface of the shell-shaped outer ring,
The shell-shaped outer ring has a nitrogen-enriched layer on its outer peripheral surface,
The amount of retained austenite of the nitrogen-enriched layer of the shell-shaped outer ring is 25% by volume or more,
When the radius of curvature of the bent portion formed when the end portion is bent is R, and the plate thickness of the shell-shaped outer ring is T,
A shell roller bearing having a relationship of R / T ≦ 1.6. The shell-type roller bearing according to any one of claims 1 to 9,
A shell-type roller bearing structure comprising: a housing including a press-fitting hole for press-fitting the shell-type roller bearing.

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