JP2007247876A - Split type roller bearing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simplify and facilitate work rotatably supporting a shaft body by a bearing, with the small number of parts. <P>SOLUTION: A split type roller bearing device includes a roller bearing 4 in which at least its outer ring is split into a plurality of split bodies 7A, 7B, and mounting parts 7b are formed integrally with one split body 7A of the outer ring at circumferential both ends on an outer diameter side of its raceway part. The outer ring split body 7A is attached and fixed to the housing 3 through the mounting parts 7d. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a split roller bearing device used mainly for shaft support parts such as camshafts and crankshafts in automobile engines.

  In recent years, further reduction in fuel consumption has been demanded for automobile engines. In order to reduce the fuel consumption, it is necessary to reduce the energy loss of the mechanical part inside the engine.

  Conventionally, in an automobile engine, in many cases, a camshaft is supported by a slide bearing (see, for example, Patent Document 1). Therefore, when a rolling bearing is applied to the shaft support portion instead of the slide bearing, the above energy is obtained. Effective in reducing loss. According to a trial calculation, if a bearing with a sliding bearing and a bearing with a rolling bearing are used under certain conditions (oil temperature 40 ° C., rotation speed 3000 rpm), a bearing with a rolling bearing is used. Torque is reduced by 18% compared to that applied.

  By the way, the camshaft includes an assembly type in which a cam manufactured separately to the shaft body is assembled, and an integral type in which the shaft body and the cam are integrally formed.

With an assembly-type camshaft, it is only necessary to press-fit a rolling bearing into the shaft body when the cam is assembled to the shaft body. However, with an integrated camshaft, cams already exist at various locations in the axial direction of the shaft body. A split type rolling bearing such as a roller bearing in which a ring or a cage of a rolling element has a split structure is used.
JP 11-148426 A

  When a split roller bearing is attached to an integral camshaft, and the camshaft is rotatably supported, a roller bearing split cage and a split outer ring are respectively mounted on the outer periphery of the required portion of the camshaft shaft. It is necessary to fix the outer ring of this roller bearing between the housing and the cam cap, and it takes a lot of man-hours for installation and is troublesome.

  In the above case, since the outer ring and the cage of the roller bearing are divided into two parts and a cam cap for fixing the outer ring is required, the number of parts is large, the shaft support part is lightened, and the cost is reduced. Unfavorable above.

  It is an object of the present invention to provide a simple and easy mounting operation with few parts when a split roller bearing is attached to a shaft body such as a camshaft and the shaft body is rotatably supported. .

  A split-type roller bearing device according to the present invention is a split-type roller bearing device including a roller bearing in which at least an outer ring is divided into a plurality of split bodies, and one split body of the outer ring includes a circumferential direction of a raceway portion thereof. Attachment portions are integrally formed on the outer diameter sides of both ends, and the outer ring divided body is attached and fixed to the housing via the attachment portions.

  In a conventional split roller bearing, when a shaft body such as a camshaft is rotatably supported, a split cage and a split outer ring of the split roller bearing are coupled to the outer periphery of the shaft body in an annular manner, Is required to be fixed to the housing side using a cap member such as a cam cap. However, in the split roller bearing device of the present invention, one of the outer ring divided bodies is fixed to the housing via its mounting portion. By doing so, the entire outer ring is fixed to the housing side, the number of members to be handled is small, and the work for rotatably supporting the shaft body can be performed easily and easily.

  Further, the split roller bearing device of the present invention eliminates the need for a cap member such as a cam cap, which is indispensable in the conventional split roller bearing, so that the number of parts can be reduced, and the cost and weight can be reduced. Can be planned.

  In particular, the outer ring divided body having a mounting portion is made of a hardened steel plate, and the mounting portion that protrudes radially outward from both ends in the circumferential direction is integrally formed with the arc portion that is a raceway portion in the outer ring divided body. When formed, the outer ring divided body having the mounting portion can be manufactured by pressing a steel plate, and the cost can be significantly reduced.

  In the split roller bearing device having the above-described configuration, the engaging portions are formed at both ends in the circumferential direction of the raceway portion of the outer ring divided body having the mounting portion, and the other outer ring is connected to the outer ring divided body in an annular shape. Engaged portions that can be engaged with the engaging portions are formed at both ends in the circumferential direction of the track portion of the divided body, and the outer ring divided bodies are engaged by the engagement between the engaging portions and the engaged portions. It is desirable to be connected in an annular shape.

  In the above configuration, the outer ring divided bodies are connected in an annular shape so as not to be separated, so that both outer ring divided bodies can be mounted so as to wind a roller bearing around the outer periphery of the shaft body. As it is, the roller bearing and the shaft body can be assembled to the housing, and the work for rotatably supporting the shaft body can be performed more easily.

  Furthermore, in the split roller bearing device having the above-described configuration, the outer ring divided body having the mounting portion and the other outer ring divided body are connected in an annular shape. When moving, there is a possibility that noise may be generated by riding on the rollers.

  For this, the inner peripheral surface of the continuous end portion of the outer ring divided body having the attachment portion and the other outer ring divided body connected in an annular shape to the outer ring divided body is the other of the outer ring divided bodies. It is desirable that the flank face recedes from the raceway surface to the outer diameter side. As described above, when the inner peripheral surface of the continuous end portion of each outer ring divided body is a flank, the roller does not contact the continuous end portion of the outer ring divided body when the rollers pass through rolling, or Since the contact is light, the generation of noise due to the rolling of the rollers is greatly suppressed.

  Furthermore, in the split roller bearing device having the above-described configuration, the axial positions of the rollers with the cage provided on the inner peripheral side of the outer ring divided body are restricted on both sides in the axial direction of the outer ring divided body having the mounting portion. It is desirable that a buttock is formed.

  If the outer ring divided body has the above inner flange, the axial position of the roller with cage is restricted, and the roller bearing including the roller with cage has a small diameter portion (small diameter portion) formed on the shaft body. In addition, the axial walls of the roller with cage are regulated by the paragraph walls on both sides in the axial direction), as well as the large diameter part formed on the shaft body and the same diameter as other parts of the shaft body can do. In particular, when a roller bearing is mounted on the large-diameter portion of the shaft body, the outer peripheral surface of the large-diameter portion becomes an inner ring raceway. The inner ring raceway can be formed easily and with high accuracy.

  According to the present invention, it is possible to easily and easily carry out the work when the shaft body is rotatably supported by attaching a split roller bearing to the shaft body, and a cap member such as a cam cap is omitted. Thus, it is possible to reduce the weight and cost of the shaft support portion with few parts.

  Hereinafter, a first embodiment, which is the best mode of the present invention, will be described with reference to FIGS. In the first embodiment, the present invention is applied to a shaft support portion of a camshaft. FIG. 1 is a longitudinal side view of a split roller bearing device according to the first embodiment, and FIG. )-(Ii) is a cross-sectional view taken along line II, FIG. 3 is an exploded perspective view of the outer ring divided body, and FIG. 4 is an enlarged cross-sectional view showing the structure of a continuous portion of both outer ring divided bodies.

  1 and 2, reference numeral 1 denotes a camshaft, 2 denotes an entire split roller bearing device, and 3 denotes a housing in which the split roller bearing device 2 is provided. The camshaft 1 is formed by integrally forming a cam 12 on a shaft body 11, and each cam 12 pushes down a cam follower (not shown) disposed below the cam 12 in accordance with rotation. A small diameter portion 11 a is formed at a support portion of the shaft body 11.

  The split roller bearing device 2 is provided on the outer periphery of the small diameter portion of the shaft 11 of the camshaft 1 and includes a roller bearing 4. The roller bearing 4 includes a plurality of rollers 5, a cage 6 that holds the rollers 5 at equal intervals in the circumferential direction, and an outer ring that includes two outer ring divided bodies 7A and 7B. The roller 5 is disposed in contact with the outer periphery of the small diameter portion 11 a of the shaft body 11. Therefore, the outer peripheral portion of the small diameter portion 11 a is an inner ring of the roller bearing 4.

  The cage 6 may have a split structure, but is formed into a shape having a crack at only one circumferential direction by a material that can be elastically deformed, such as resin, and opened in a C shape in a side view. Also good. In the present embodiment, the cage 6 is slightly narrower than the small diameter portion 11a of the shaft body 11, and the axial position is determined by the stage walls on both sides in the axial direction of the small diameter portion 11a while holding the rollers 5. Being regulated.

  The two outer ring divided bodies 7A and 7B are connected to each other in an annular shape, both of which are formed by pressing a hardened steel plate such as carburized steel or nitrided steel such as SCM415 into a required shape. is there. In this embodiment, each outer ring divided body 7A, 7B has a plate thickness of 1 to 4.5 mm, the hardness of the outermost surface layer is Hv650 or more, and the compressive residual stress is 500 Mpa to increase the fatigue strength of the outermost surface layer. .

  Of the outer ring divided bodies 7A and 7B, one outer ring divided body 7A (the upper outer ring divided body in FIGS. 1 to 3 is referred to as the upper outer ring divided body in the following description) is the housing 3 And also serves as a member for fixedly mounting the roller bearing 4 between them, and a mounting portion 7d for the housing 3 is integrally formed.

  That is, as clearly shown in FIGS. 2 and 3, in the upper outer ring divided body 7 </ b> A, the portions following the circumferential ends of the semicircular arc portion 7 c serving as the track portion are bent outward in the radial direction, respectively. Thus, the attaching portion 7d protruding outward in the radial direction is integrally formed. Both attachment portions 7d, 7d project outwardly linearly along a diameter line passing through both ends in the circumferential direction of the arc portion 7c. An insertion hole 7e for the screw 8 is formed in each attachment portion 7d. A screw hole 3e is formed in the mounting surface (upper surface in FIGS. 1 and 2) of the housing 3 corresponding to the screw insertion hole 7e of the mounting portion 7d.

  The upper outer ring divided body 7A is fixed to the housing 3 with a means such as a screw 8 in a state where the mounting portion 7d is placed on the upper surface of the housing 3, so that the upper outer ring divided body 7A is fixed. The entire roller bearing 4 including it is fixedly attached to the housing 3.

  Of the outer ring divided bodies 7A and 7B, the other outer ring divided body 7B (the lower outer ring divided body in FIGS. 1 to 3 is referred to as the lower outer ring divided body in the following description) is almost half. It is formed in a circular arc and is fitted into a circular arc recess 3 a formed in the housing 3.

  Further, in the upper outer ring divided body 7A, an engaging hole 7f penetrating the plate thickness is formed as an engaging portion at a boundary portion between the arc portion 7c and the mounting portion 7d, while the lower outer ring An engagement convex portion 7g protruding in the circumferential direction is formed as an engaged portion that engages with the engagement portion at the circumferential end of the divided body 7B. The engaging convex portion 7g has a shape that fits through the engaging hole 7f of the upper outer ring divided body 7A in a penetrating manner, and has a claw portion 7h at the tip.

  Furthermore, the upper outer ring divided body 7A and the lower outer ring divided body 7B are connected in an annular shape, and the continuous end portions of the outer ring divided bodies 7A and 7B are structured as shown in FIG. Inner circumferential surfaces of the continuous end portions of the outer ring divided bodies 7A and 7B are flank surfaces 7i and 7i that are retreated to the outer diameter side from the raceway surfaces of other portions of the outer ring divided bodies 7A and 7B. Specifically, in the present embodiment, the radius of curvature R2 of the inner peripheral surface of the continuous end portion of both outer ring segments 7A, 7B is the radius of curvature R1 of the raceway surface of the other part of both outer ring segments 7A, 7B. As a result, the inner peripheral surface of the continuous end portion becomes a flank 7i that recedes to the outer diameter side.

  In addition to the above, the flank 7i may be a surface that extends in a straight line, a surface that curves in a direction opposite to the curving direction of the arc portion 7c of each outer ring divided body 7A, 7B, The flank 7i may be formed by pressing simultaneously with the formation of the entire outer ring divided bodies 7A and 7B, or may be formed by grinding or polishing.

  In the above configuration, when attaching to the camshaft 1, the roller 5 with the cage 6 is provided on the outer circumference of the small diameter portion 11a of the camshaft 1, and both the upper and lower sides of the outer circumference of the roller 5 with the cage 76 are provided. The outer ring divided bodies 7A and 7B are combined in an annular shape.

  Due to the combination of the upper and lower outer ring divided bodies 7A and 7B, between them, the engaging convex portion 7g of the lower outer ring divided body 7B is fitted into the engaging hole 7f of the upper outer ring divided body 7A in a penetrating manner. The claw portion 7h of the engaging convex portion 7g engages with the peripheral edge of the engaging hole 7f on the outer diameter side of the engaging hole 7f, thereby preventing the engaging convex portion 7g from coming out. The outer ring divided bodies 7A and 7B on the side are connected in an annular shape so as not to be separated, and the entire roller bearing 4 including the outer ring divided bodies 7A and 7B is wound around the outer periphery of the small diameter portion 11a of the shaft body 11. Installed.

  Next, when the roller bearing 4 mounted on the camshaft 1 is fitted together with the camshaft 1 in the circular arc recess 3 a of the housing 3, the mounting portion 7 d of the upper outer ring divided body 7 A is placed on the upper surface of the housing 3. It becomes a state. Here, by fixing the mounting portion 7d to the housing 3 with the screw 8, the lower outer ring divided body 7B is fixed in the arc recess 3a of the housing 3 via the upper outer ring divided body 7A, and both The entire roller bearing 4 including the outer ring divided bodies 7A and 7B is fixedly attached to the housing 3, and the camshaft 1 is rotatably supported by the roller bearing 4.

  In the above case, both the outer ring divided bodies 7A and 7B are connected in an annular shape by the engagement of the engagement hole 7f and the engagement convex portion 7g, so that the roller bearing 4 including these both outer ring divided bodies 7A and 7B is connected. The whole can be attached to the outer periphery of the camshaft 1 in a wrapping manner, so that the subsequent handling of the roller bearing 4 is not necessary, and the operation when the camshaft 1 is rotatably supported by the roller bearing 4 is easy. become.

  Further, since the outer ring composed of both outer ring divided bodies 7A and 7B can be fixed to the housing 3 through a part of the outer ring divided body 7A (attachment portion 7d), a cam cap or the like is used for fixing the outer ring as in the prior art. A cap member is unnecessary, the number of parts is reduced, and the weight and cost of the shaft support portion can be reduced.

  Further, in general, in a roller bearing in which the outer ring is divided into two outer ring divided bodies, when the two outer ring divided bodies are connected in series and the roller rolls through the part, noise is caused by running of the roller onto the part. However, as described above, if the inner peripheral surface of the continuous end portion of each outer ring divided body 7A, 7B is a flank 7i, when the roller 5 rolls, the roller 5 Since the outer ring divided bodies 7A and 7B are not in contact with the connected end portions or lightly in contact with each other, generation of noise due to the roller 5 being run up is greatly suppressed.

  FIG. 5 shows a split roller bearing device according to another embodiment. The split roller bearing device 2 of this embodiment is provided on the outer periphery of the large diameter portion 11 b of the shaft body 11 of the camshaft 1. In addition, the outer peripheral portion of the large diameter portion 11 b is an inner ring of the roller bearing 4. The cage 6 has inner flange portions 6a, 6a on both sides in the axial direction, and the axial position is regulated by the engagement between the inner flange portions 6a, 6a and the large diameter portion 11b of the shaft body 11. It has become. Other configurations such as the roller bearing 4 including a plurality of rollers 5, a cage 6 that holds these rollers 5 at equal intervals in the circumferential direction, and an outer ring that includes two outer ring divided bodies 7A and 7B are as described above. This is the same as the first embodiment.

  FIG. 6 shows an outer ring divided body according to still another embodiment. By cutting up part of the attaching portion 7d at both circumferential ends of the arc portion 7c of the upper outer ring divided body 7A, The fitting convex part 7j which protrudes along is formed, and the fitting concave part 7k which fits the fitting convex part 7j is formed at both ends in the circumferential direction of the lower outer ring divided body 7B. Reference numeral 7m denotes a concave portion formed in the attachment portion 7d by cutting and raising the fitting convex portion 7i. Further, in the embodiment of FIG. 6, a screw insertion hole 7e having a cylindrical protruding portion 7n is formed in the attaching portion 7d of the upper outer ring divided body 7A by burring. The upper outer ring divided body 7A is integrally formed with a mounting portion 7d, and the lower outer ring divided body 7B has no mounting portion and is formed into a substantially semicircular arc shape as described above. This is the same as the embodiment.

  In the embodiment of FIG. 6, when both the upper and lower outer ring divided bodies 7A and 7B are connected in an annular shape, the fitting convex portion 7j of the upper outer ring divided body 7A is connected to the lower outer ring divided body 7B. By fitting in the fitting recess 7k, the axial positions of the outer ring divided bodies 7A and 7B are regulated, and no positional deviation occurs between the outer ring divided bodies 7A and 7B. Further, since the cylindrical protrusion 7n is provided in the screw insertion hole 7e, the screw 8 can be strongly tightened without bringing the tool into contact with the surface of the mounting portion 7d.

  7A and 7B show an outer ring divided body according to still another embodiment, in which FIG. 7A is a longitudinal side view, and FIG. 7B is a cross-sectional view taken along line (b)-(b) in FIG. . In the embodiment of FIG. 7, inner flange portions 7o projecting radially inward are formed on both axial sides of the circular arc portion 7c of the upper outer ring divided body 7A. The inner flange portion 7o is for restricting the axial position of the roller 5 with a cage 6 provided on the inner peripheral side of the upper outer ring divided body 7A. Therefore, the inner collar part 7o should just extend to the radial direction position in which the holder | retainer 6 is located. Moreover, the inner collar part 7o should just be formed in the circular arc part 7c among each part of the upper outer ring division body 7A, and may be abbreviate | omitted in the attaching part 7d.

  FIG. 8 is a longitudinal side view of a split roller bearing device including the outer ring split body of FIG. In the embodiment shown in the figure, the shaft body 11 is formed with a large diameter portion 11b. The outer periphery of the large diameter portion 11b is an inner ring, and the outer periphery includes a roller 5 with a cage 6 and outer ring divided bodies 7A and 7B. A roller bearing 4 is provided. As shown in FIG. 6, inner flange portions 7o are formed on both axial sides of the upper outer ring divided body 7A, but similar inner flanges are formed on both axial sides of the lower outer ring divided body 7B. Part 7p is formed.

  Also in the embodiment of FIG. 8, the upper outer ring divided body 7A has a mounting portion 7d. By fixing the mounting portion 7d to the housing 3, not only the upper outer ring divided body 7A but also the lower outer ring is mounted. The divided body 7B is fixed to the housing 3, and the roller bearing 4 including both the outer ring divided bodies 7A and 7B is fixedly mounted on the housing 3 side as in the case of the first embodiment.

  In the embodiment of FIG. 8, the axial position of the roller 5 with the cage 6 is regulated by the inner flange portions 7o, 7p of the outer ring divided bodies 7A, 7B. Therefore, as in the first embodiment, the roller bearing 4 is not required to be provided on the outer periphery of the small-diameter portion 11a of the shaft body 11, and the roller bearing 4 may be provided on the outer periphery of the large-diameter portion 11b of the shaft body 11 or on the portion having the same diameter as the other portions of the shaft body 11. it can. Moreover, when the outer peripheral part of the large diameter part 11b of the shaft body 11 is used as the inner ring of the roller bearing 4, it is possible to obtain a highly accurate inner ring by grinding or polishing the outer periphery of the large diameter part 11b.

  In each of the above embodiments, the lower outer ring divided body 7B made of a steel plate is provided corresponding to the upper outer ring divided body 7A (the outer ring divided body having the mounting portion 7d). In the case of acting on the outer ring divided body 7A, the outer ring divided body 7B made of a lower steel plate as shown in the figure may be omitted, and the inner peripheral portion of the arc recess 3a of the housing 3 may be used as the outer ring raceway. In that case, the inner peripheral part of the circular arc recess 3a of the housing 3 becomes one of the outer ring divided bodies.

1 is a longitudinal side view of a split roller bearing device according to a first embodiment of the present invention. Sectional drawing along the (ii)-(ii) line | wire of FIG. The disassembled perspective view of the outer ring split body of the first embodiment. The expanded sectional view which shows the structure of the connection part of the both outer ring division bodies in the said 1st Embodiment. The longitudinal section side view of the split type roller bearing device concerning other embodiments of the present invention. The disassembled perspective view of the outer ring split body according to still another embodiment of the present invention. It is a figure which shows the outer ring split body which concerns on other embodiment of this invention, (A) is a vertical side view, (B) is sectional drawing in the (b)-(b) line | wire of (A). FIG. 7 is a vertical side view of a split roller bearing device including the outer ring split body of FIG. 6.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Camshaft 11 Shaft body 2 Split type roller bearing device (whole)
3 Housing 4 Roller Bearing 5 Roller 6 Cage 7A Outer Ring Divided Body 7B Outer Ring Divided Body 7c Arc Part 7d Mounting Part

Claims (5)

A split roller bearing device including a roller bearing in which at least an outer ring is divided into a plurality of divided bodies,
An outer ring is integrally formed with mounting portions on the outer diameter side at both ends in the circumferential direction of the raceway portion, and the outer ring divided body is fixedly attached to the housing via the mounting portion. A split roller bearing device.   The outer ring divided body having a mounting portion is made of a hardened steel plate, and the mounting portion that protrudes radially outward from both ends in the circumferential direction is integrally formed on the arc portion that is a raceway portion in the outer ring divided body. The split roller bearing device according to claim 1.   Engagement portions are formed at both ends in the circumferential direction of the track portion of the outer ring divided body having the attachment portion, and at both ends in the circumferential direction of the track portion of the other outer ring divided body connected in an annular shape with the outer ring divided body. An engaged portion that can be engaged with the engaging portion is formed, and the outer ring divided bodies are connected in an annular shape by engagement of the engaging portion and the engaged portion. The split roller bearing device according to claim 2.   The inner peripheral surface of the connecting end portion of the outer ring divided body having the mounting portion and the other outer ring divided body connected in an annular shape to the outer ring divided body is outside the raceway surface of the other part of both outer ring divided bodies. The split roller bearing device according to any one of claims 1 to 3, wherein the split roller bearing device has a flank face that is retracted radially.   The inner flange part which controls the axial direction position of the roller with a retainer provided in the inner peripheral side of this outer ring division body is formed in the axial direction both sides of the outer ring division body which has an attaching part. The split roller bearing device according to any one of the above.

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