JP2007078090A - Needle roller bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a needle roller bearing having improved lubricating performance without lowering the strength of a cage. <P>SOLUTION: The needle roller bearing 41 comprises a plurality of needle rollers 42, and the cage 43 having a ring portion 43a, a plurality of columnar portions (not illustrated) protruded from the end face of the ring portion 43a, and pockets 43c provided between the adjacent columnar portions for storing the plurality of needle rollers 42. The cage 43 has cutout portions 43d passing therethrough in the axial direction, provided on the radial outside of the ring portion 43a corresponding to the pockets 43c. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a needle roller bearing, and more particularly to a needle roller bearing that requires excellent lubrication performance.

  For example, as shown in FIGS. 7A and 7B, a conventional needle roller bearing 1 includes a plurality of needle rollers 2, a ring portion 3a, and a plurality of column portions 3b protruding from end faces of the ring portion 3a. And a cage 3 having a pocket 3c for accommodating a plurality of needle rollers 2 between adjacent column portions 3b. Alternatively, an outer ring is further provided outside the cage 3.

  The needle roller bearing 1 configured as described above has an advantage that a high load capacity and high rigidity can be obtained for a small bearing projection area because the needle roller 2 and the raceway surface are in line contact with each other. Widely used in various fields such as engines.

  Furthermore, as shown in FIG. 8, the basic configuration of the needle roller bearing used in an environment where a particularly large load is applied is the same as that of the needle roller bearing 1, and the needle roller accommodated in the cage 13. There is known a needle roller bearing 11 in which the load capacity is increased by increasing the number of twelve.

  The needle roller bearings 1 and 11 having the above-described configuration are required to have high lubricity because they are used in a high load environment, but as the number of needle rollers 2 and 12 accommodated increases in order to increase the load capacity, The oil permeability of the lubricating oil decreases.

  Therefore, for the purpose of improving the lubricity of the needle roller bearing, for example, as shown in FIG. 9, the basic configuration is the same as that of the needle roller bearing 1, and corresponds to the column portion 23b on the radially inner side of the ring portion 23a. Japanese Patent Laid-Open No. 11-22736 (Patent Document 1) discloses a needle roller bearing 21 having a notch portion 23d penetrating in the axial direction at a position. According to the publication, the notch 23d provided in the cage 23 increases the amount of lubricating oil flowing into the bearing from the outside, and can increase the fluidity of the lubricating oil between the adjacent pockets 23c. Are listed.

As another example of improving the lubricity of the needle roller bearing, for example, as shown in FIG. 10, the basic configuration is the same as that of the needle roller bearing 1, and the column portion 33b on the radially outer side of the ring portion 33a is provided. A needle roller bearing 31 provided with an oil groove 33d at a corresponding position is described in Japanese Patent Laid-Open No. 2001-304270 (Patent Document 2). This publication also describes that the oil groove 33d can serve as a passage for the lubricating oil and distribute the lubricating oil satisfactorily.
JP-A-11-22736 JP 2001-304270 A

  The needle roller bearings 21 and 31 described in each of the above publications are provided with notches 23d or oil grooves 33d at positions corresponding to the column portions 23b and 33b of the ring portions 23a and 33a, so that they flow from the outside. The lubricated oil does not reach the rolling surfaces of the needle rollers 22 and 32 directly, and it cannot be said that the lubrication efficiency is good.

  Moreover, since the contact area of ring part 23a, 33a and pillar part 23b, 33b becomes small, we are anxious about the strength fall as the holder | retainer 23,33 whole. This increases the risk of breakage of the cages 23 and 33 when used in a high load environment.

  Accordingly, an object of the present invention is to provide a needle roller bearing with excellent lubricity without reducing the strength of the cage.

  A needle roller bearing according to the present invention includes a plurality of needle rollers, a ring portion, a plurality of column portions protruding from an end surface of the ring portion, and a pocket for accommodating the plurality of needle rollers between adjacent column portions. And a retainer. The retainer has a notch that penetrates in the axial direction at a position corresponding to the pocket of the ring portion.

  Further, the needle roller bearing according to another curved surface of the present invention includes a plurality of needle rollers, a ring portion, a plurality of column portions protruding from an end surface of the ring portion, and a plurality of needles between adjacent column portions. A cage having a pocket for accommodating the roller. And a holder | retainer has a through-hole penetrated to an axial direction in a ring part. And it is preferable that a through-hole is provided in the position corresponding to the pocket of a ring part.

  In any of the above configurations, the lubricating oil flowing from the notch of the cage reaches the rolling surfaces and end surfaces of the needle rollers directly, so that the lubrication efficiency is very high. Further, since the contact area between the ring part and the column part is the same as that without the notch part, a needle roller bearing having excellent lubricity can be obtained without reducing the strength of the cage.

  According to the present invention, by providing a lubricating oil inflow path at a position corresponding to the pocket of the ring portion, a needle roller bearing having excellent lubricity can be obtained without reducing the strength of the cage.

  With reference to Fig.1 (a), the needle roller bearing 41 which concerns on one Embodiment of this invention is demonstrated.

  The needle roller bearing 41 includes a plurality of needle rollers 42, a ring portion 43a, a plurality of column portions (not shown) protruding from the end face of the ring portion 43a, and a plurality of needle shapes between adjacent column portions. A cage 43 having a pocket 43c for accommodating the roller 42 is provided. And the holder | retainer 43 has the notch part 43d penetrated to an axial direction in the position corresponding to the pocket 43c on the radial direction outer side of the ring part 43a. Alternatively, an outer ring is further provided outside the cage 43.

  The cage 43 is a metal cage formed by cutting or pressing, and the notch 43d is processed by pressing, wire cutting, electric discharge machining, or the like.

  By providing the notch 43d in the ring portion of the cage 43 as in the above configuration, the amount of lubricating oil flowing from the outside increases, so that the cooling efficiency of the needle roller bearing 41 is high, and wear dust and dust Emissions are promoted. Further, since the lubricating oil flowing in from the notch 43d reaches the rolling surfaces and end surfaces of the needle rollers 42, the lubrication efficiency is very high.

  Furthermore, the cage 43 is lightened by providing a cutout in a part of the ring portion 43a, but the contact area between the ring portion 43a and the column portion is the same as that without the cutout portion. The strength of 43 does not decrease.

  In addition, although the needle roller bearing 41 shown to Fig.1 (a) showed the example which provided the U-shaped notch part 43d in the radial direction outer side of the ring part 43a of the holder | retainer 43, it is restricted to this. Alternatively, notches having any shape may be provided at any position.

  For example, as shown in FIG. 1B, an arcuate cutout 53d may be used. Further, as shown in FIGS. 2A and 2B, notches 63d and 73d may be provided at positions corresponding to the pockets 63c and 73c on the radially inner side of the ring portions 63a and 73a. In addition, since the other structure of the needle roller bearings 51, 61, 71 is the same as that of the needle roller bearing 41, description is abbreviate | omitted.

  The cages 43, 53, 63, and 73 in each of the above embodiments are outer diameter guide type cages that are guided by the radially outer raceway surface, but are cut in part on the radially outer side or radially inward. Since the notches 43d, 53d, 63d, and 73d are provided, there is no need to change the guidance method.

  The present invention can also be applied to a needle roller bearing having an inner diameter guide type cage, but by actively supplying lubricating oil to the outer diameter surface side of the cage, Since heat generation on the sliding contact surface with the cage can be suppressed and the discharge of wear powder can be promoted, a higher effect can be expected by applying it to a needle roller bearing having an outer diameter guide type cage.

  Furthermore, in each of the above-described embodiments, the example in which the notch portion is provided on the radially outer side or the radially inner side of the cage ring portion has been described. 83a, 93a, 103a, 113a may be provided with through holes 83d, 93d, 103d, 113d penetrating in the axial direction.

  In this case, the through holes may be long holes 83d and 113d as shown in FIGS. 3 (a) and 3 (d), or round holes 93d as shown in FIGS. 3 (b) and 3 (c). , 103d. Further, as shown in FIGS. 3C and 3D, the through holes 103d and 113d may be arranged at positions corresponding to the pillars. However, from the viewpoint of the lubrication efficiency and the strength of the cage, FIG. As shown to (a) and (b), it is preferable to arrange | position in the position corresponded to pocket 83c, 93c. The basic configuration of each of the needle roller bearings 81, 91, 101, and 111 shown in FIG. 3 is the same as that of the needle roller bearing 41, and a description thereof will be omitted.

  Moreover, since each needle roller bearing as shown in FIGS. 4-6 has increased the accommodation number of needle rollers in order to raise load capacity, while high lubrication performance is calculated | required, the fluidity | liquidity of lubricating oil Is low. Therefore, by applying the present invention to these needle roller bearings, higher effects can be expected. 4 to 6 correspond to the respective drawings in FIGS. 1 to 3 and the configuration is the same except that the number of needle rollers accommodated is increased, and the description thereof is omitted.

  Next, in order to confirm the effect of the present invention, the time required for a certain amount of lubricating oil VG10 to pass through each bearing in a stationary state was measured, and oil permeability was calculated based on the conventional product. In Table 1, “conventional product” refers to the conventional needle roller bearing 1 shown in FIG. 7, and “Example 1” refers to the needle according to one embodiment of the present invention shown in FIG. For the tapered roller bearing 41, “Example 2” refers to a needle roller bearing 111 according to another embodiment of the present invention shown in FIG. The test results are shown in Table 1.

  Referring to Table 1, it was confirmed that the needle roller bearings 41 and 111 to which the present invention is applied have an oil permeability of 1.2 times that of the conventional needle roller bearing 1.

  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 present invention is advantageously used for needle roller bearings that require high lubrication performance.

BRIEF DESCRIPTION OF THE DRAWINGS It is a needle roller bearing which concerns on one Embodiment of this invention, Comprising: (a) is an example which provided the U-shaped notch, (b) is a figure which shows the example which provided the circular arc-shaped notch. . It is a needle roller bearing which concerns on other embodiment of this invention, Comprising: It is a figure which shows the example which provided the notch in the radial inside of the holder | retainer. It is a needle roller bearing which concerns on other embodiment of this invention, Comprising: It is a figure which shows the example which provided the through-hole in the ring part of the holder | retainer. It is a needle roller bearing which concerns on other embodiment of this invention, Comprising: It is the figure which increased the accommodation number of the needle rollers of each needle roller bearing shown in FIG. FIG. 5 is a view showing an increase in the number of needle rollers accommodated in each of the needle roller bearings shown in FIG. 2 according to another embodiment of the present invention. FIG. 4 is a view showing a needle roller bearing according to another embodiment of the present invention, in which the number of needle rollers accommodated in each needle roller bearing shown in FIG. 3 is increased. It is a figure which shows the conventional needle roller bearing, Comprising: (a) is a side view, (b) is a front view. It is the figure which increased the accommodation number of the needle rollers of the needle roller bearing of FIG. It is a figure which shows the conventional needle roller bearing, Comprising: It is a figure which shows the example which provided the notch part in the radial inside of the retainer ring part. It is a figure which shows the conventional needle roller bearing, Comprising: It is a figure which shows the example which provided the oil groove in the radial direction outer side of the retainer ring part.

Explanation of symbols

1, 11, 21, 31, 41, 51, 61, 71, 81, 91, 101, 111, 121, 131, 141, 151, 161, 171, 181 Needle roller bearings, 2, 12, 22, 32, 42,52,62,72,82,92,102,112,122,132,142,152,162,172,182 Needle roller, 3,13,23,33,43,53,63,73,83 , 93, 103, 113, 123, 133, 143, 153, 163, 173, 183 Cage, 3a, 13a, 23a, 33a, 43a, 53a, 63a, 73a, 83a, 93a, 103a, 113a, 123a, 133a , 143a, 153a, 163a, 173a, 183a Ring part, 3b, 13b, 23b, 33b, 123b, 133b, 143b, 153b, 1 63b, 173b, 183b Column, 3c, 13c, 23c, 33c, 43c, 53c, 63c, 73c, 83c, 93c, 103c, 113c, 123c, 133c, 143c, 153c, 163c, 173c, 183c pocket, 3d, 13d , 23d, 43d, 53d, 63d, 73d, 123d, 133d, 143d, 153d Notch, 33d Oil groove, 83d, 93d, 103d, 113d, 163d, 173d, 183d Through hole.

Claims (3)

A cage having a plurality of needle rollers, a ring portion, a plurality of column portions protruding from an end surface of the ring portion, and a pocket for accommodating the plurality of needle rollers between the adjacent column portions. ,
The said retainer is a needle roller bearing which has a notch part penetrated to an axial direction in the position corresponding to the said pocket of the said ring part. A cage having a plurality of needle rollers, a ring portion, a plurality of column portions protruding from an end surface of the ring portion, and a pocket for accommodating the plurality of needle rollers between the adjacent column portions. ,
The cage is a needle roller bearing having a through-hole penetrating in the axial direction in the ring portion.   The needle roller bearing according to claim 2, wherein the through hole is provided at a position corresponding to the pocket of the ring portion.

Images