JP2003269467A - Roller bearing with pin type cage - Google Patents

Abstract

(57) [Problem] To provide a roller bearing with a pin-type cage which has improved lubrication performance while preventing wear of pins and pin insertion holes. SOLUTION: The roller bearing with a pin type cage 10 of the present invention has a crowning portion 13a at both ends of at least one of a pin insertion hole 13 and a pin 14.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roller bearing with a pin type cage. 2. Description of the Related Art Conventionally, cages used for roller bearings include press cages and machined cages. These cages are used to secure the strength of pillars in contact with the rollers. Requires a certain interval, which reduces the number of rollers that can be loaded into the cage. The load capacity of a roller bearing depends on the size of several rollers. Therefore, when a high load capacity is required for the roller bearing, as shown in FIG. 7, a pin type retainer 6 having a structure in which a pin 64 is passed through a hollow roller (hereinafter, also referred to as a roller) 61 to support it.
Roller bearing with roller 2 (roller bearing with pin type cage)
Is used. The pin type retainer 62 includes a roller 61
The pin 64 is passed through the hollow pin insertion port, both ends of the pin 64 are supported by a pair of annular side plates 65, and one end of the pin 64 is welded to the side plate 65, so that the pin 64 and the side plate 6
5 are integrally formed. With such a structure,
The distance between the rollers 61 can be reduced to increase the number of rollers that can be loaded in the cage. [0003] The pin type cage as described above is mainly used for large roller bearings. Such large roller bearings are often used in locations requiring high load capacity, such as reduction gears for rolling mills and large press machines in steel works. FIG.
FIG. 2 is a partial cross-sectional view of the conventional roller bearing shown in FIG. As shown above, the roller bearing 60 provided with the conventional pin type retainer 62 as shown in FIG. 8 is formed in a ring shape, and holds the pair of side plates 65, the hollow rollers 61, and the rollers 61 rotatably. And a pin 64. Rollers 61
Pin insertion hole 63 having a diameter slightly larger than the diameter of pin 64
Penetrates the axis of the roller 61. A screw portion 66 is formed at one end of the pin 64. The screw portion 66 of the pin 64 is screwed into a screw hole 68 formed in one side plate 65, and the other end (head) 67 of the pin 64 is provided at equal intervals in the circumferential direction of the other side plate 65. Into the tapped hole 69. After the head 67 of the pin 64 is inserted through the tapped hole 69, the end face of the head 67 of the pin 64 is generally fixed to the side plate 65 by welding or the like. W is a weld. When the roller bearing 60 provided with the pin type retainer 62 having the above-described configuration is mounted on a horizontal shaft (not shown) (a shaft extending in the horizontal direction), the weight of the entire pin type retainer 62 is reduced. It is supported only by the contact portion between the inner peripheral surface of the pin insertion hole 63 and the outer peripheral surface of the pin. At this time, the pin type retainer 62 functions as a roller guide type retainer in which the side plate 65 does not contact a race (not shown). [0004] In a conventional pin type cage 62 as shown in FIG. 8, the inner peripheral surface of a pin insertion hole 63 formed in a hollow roller 61 is usually ground and finished. Since it is not performed for the reason that it is difficult, the roughness is generally poor. For this reason, abrasion powder may be generated at a position where the outer peripheral surface of the pin 64 slides on the inner peripheral surface of the pin insertion hole 63, which may adversely affect lubrication. In addition, contact stress (contact surface pressure) concentrates on the end of the pin insertion hole 63 due to skew of the roller 61 due to rapid acceleration / deceleration or misalignment, and the pin 64 is worn to reduce the cross-sectional area. Pin 6
There is room for improvement with respect to the point that the roller bearing 4 breaks and the roller bearing 60 cannot rotate. Further, the pin type retainer 6
Since the side plate 65 is located near the end of the pin insertion hole 63 due to the structure of 2, the grease lubrication has room for improvement in that it is difficult for the lubricant to enter the end of the pin insertion hole 63. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a roller bearing with a pin-type cage that has improved lubrication performance while preventing abrasion of a pin and a pin insertion hole. SUMMARY OF THE INVENTION The object of the present invention is to provide a pin which is inserted into a pin insertion hole passing through the axis of a roller and rotatably supports the roller, and which is formed in an annular shape and is parallel to each other. In a pin-type cage-equipped roller bearing having a pin-type cage having a pair of side plates arranged and fixing both ends of the pin, a crowning portion is provided at at least one end of the pin insertion hole and the pin. This is achieved by a roller bearing with a pin type retainer, which is provided. Here, the crowning portion refers to a portion where the contour drawn by the peripheral surface of the roller or the pin is inclined or curved in a cross-sectional view of the roller or the pin cut in the axial direction. That is, the crowning portion is inclined or curved so as to escape from the opposing counterpart member. According to the above configuration, the roller bearing with the pin-type cage has the crowning portions at both ends of at least one of the pin insertion hole and the pin, so that the contact surface pressure at the end of the pin insertion hole is reduced. By relaxing, wear of the pin insertion hole and the pin can be prevented. Further, the rollers rotate while being inclined with respect to the retainer due to skew. That is,
The pin is not parallel to the pin insertion hole and has an angle. At this time, the surface pressure at the end of the pin insertion hole is higher than in normal times. Further, since the gap between the end of the pin insertion hole and the end of the pin is larger than that of the related art by providing the crowning portion, the lubricant can easily enter. An embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a partial cross-sectional view showing a first embodiment of a roller bearing with a pin type cage (hereinafter, also referred to as a roller bearing) according to the present invention. The roller bearing 10 includes hollow rollers (hereinafter, also referred to as rollers) 11,
And a pin-type holder 12. The roller 11 has a pin insertion hole 13 penetrating the axis. A pin type retainer 12 is inserted into a pin insertion hole 13, and a pin 14 for rotatably holding the roller 11 and a pair of annular and concentrically arranged side plates for fixing both ends of the pin 14. 15. A screw portion 16 is formed at one end of the pin, and a large-diameter portion (hereinafter, also referred to as the head of the pin) 17 is formed at the other end. Screw portion 16 of pin 14
Are screwed into screw holes 18 provided in the same number as the pins 14 at equal intervals in the circumferential direction of the one side plate 15, and the heads 17 of the pins 14 are provided in the same number as the pins 14 at equal intervals in the circumferential direction of the other side plate 15. The pin 14 and the side plate 15 are fixed by fitting into the tapped hole 19 and welding the end face of the head 17. W
Is a welded portion provided on the head 17 of the pin 14. Although not shown in the drawing, the lower side (the lower side in FIG. 1) of the outer peripheral surface of the roller 11 is in sliding contact with the raceway surface of the inner ring of the roller bearing 10, and the upper side (the upper side in FIG. 1) is in contact with the raceway surface of the outer ring. Is in sliding contact. In the present embodiment, at both ends of the pin insertion hole 13 of the roller 11, crowning portions 13 a whose diameters increase outward in the axial direction of the pin insertion hole 13 are provided. That is, the crowning portion 13a on the screw portion 16 side (left side in FIG. 1) of the pin 14 is
It is a tapered surface configured so that the diameter of the pin insertion hole 13 opening to the side 8 decreases toward the inside in the axial direction (the middle portion side of the pin insertion hole). In addition, the head 17 side of the pin 14 (FIG. 1)
(Right side in FIG. 3) is a tapered surface configured such that the diameter of the pin insertion hole 13 opening toward the tap hole 19 of the side plate 15 decreases inward in the axial direction. As shown in FIG. 1, the crowning portions 13a both have a predetermined length L1 in the axial direction. Here, it is preferable that the length L1 of the crowning portion 13a is 3.5% to 10% with respect to the length L obtained by removing the pin hole chamfering length from the roller length. Further, the crowning amount (radial width of the crowning portion) A is 0.010% or more of the pin hole diameter.
It is preferably set to 0.025%. When the crowning portion is formed by cutting or the like, it is possible to improve the smoothness of the surface of the crowning portion by lowering the feed rate. According to the configuration of this embodiment, the pin insertion hole 1
By providing the crowning portions 13 a at both ends of the pin 3, the contact surface pressure between the pins 14 and the pin insertion holes 13 at both ends of the pin insertion holes 13 can be reduced, and wear of the pins 14 and the pin insertion holes 13 can be prevented. . When skew occurs in the roller bearing 10, the pin 14 rotates with its axial direction inclined with respect to the pin type retainer 12. That is, the axial direction of the pin 14 is not parallel to the axial direction of the pin insertion hole 13 but has an angle. At this time, the contact surface pressure received by the pins 14 at both ends of the pin insertion hole 13 is further higher than in normal times. However, the crowning portions 13 provided at both ends of the pin insertion hole 13
Since “a” makes surface contact with the end of the inclined pin 14 within a predetermined range, the contact surface pressure between the pin 14 and the pin insertion hole 13 can be reduced. Further, the provision of the crowning portion 13a increases the diameter of the pin insertion hole 13 on the outside in the axial direction, and also increases the distance between the pin 14 and the pin insertion hole 13. Lubricants existing therebetween can easily enter the pin insertion holes 13. Therefore, the lubrication performance of the roller bearing 10 is improved. A second embodiment of the roller bearing with a pin type retainer according to the present invention will be described with reference to FIGS. In the present embodiment, members and the like having the same configuration and operation as the members and the like already described are denoted by the same reference numerals or corresponding reference numerals in the drawings, and the description thereof will be simplified or omitted. FIG. 2 is a partial cross-sectional view of the roller bearing according to the second embodiment. FIG. 3 is a partially enlarged view of the pin type retainer 22 shown in FIG.
FIG. 4 shows an overall view of the pin 24. In the present embodiment, the crowning portions are provided at both ends of the pin 24 instead of the pin insertion hole 23 as described below. At both ends of the pin 24, there are provided crowning portions 24a whose diameter decreases outward in the axial direction of the pin 24. That is, the pin 24 side of the screw portion 26 (FIG. 2)
The left crowning portion 24a is formed with a screw portion 26.
Therefore, it is a tapered surface that slopes continuously from the intermediate portion of the pin 24 having a larger diameter than the thread portion 26. Further, the vicinity of the axially inner end of the head 27 of the pin 24 is configured to be smaller than the diameter of the intermediate portion of the pin 24. Pin 24
Crowning part 2 on the head 27 side (right side in FIG. 2)
Reference numeral 4a denotes a tapered surface which is inclined from the vicinity of the axially inner end of the head 27 to the middle. Crowning part 24a
Have a predetermined length L2 in the axial direction, as shown in FIGS. In FIG. 2, L ′ is a length obtained by excluding the chamfered length of the pin hole from the roller length. The length L2 of the crowning portion 24a corresponds to the axial length from the middle end of the tapered surface to the end corresponding to the end of the length L 'in the radial direction. Here, it is preferable to be 3.5% to 10% with respect to the length L 'obtained by removing the pin hole chamfering length from the roller length. The crowning amount B is preferably in the range of 0.0125 to 0.03 with respect to the pin diameter of the pin 24. According to the configuration of the present embodiment, the same effects as in the first embodiment can be obtained. That is, by providing the crowning portions 24a at both ends of the pin 24, the contact surface pressure between the pin 24 and the pin insertion hole 23 at both ends of the pin 24 is reduced, and wear of the pin 24 and the pin insertion hole 23 is prevented. it can. Further, when skew occurs in the roller bearing 20, the crowning portions 24a provided at both ends of the pin 24 come into surface contact with the end of the inclined pin 24 within a predetermined range. The contact surface pressure with the hole 23 can be reduced. Further, the provision of the crowning portion 24a reduces the diameter of the pin 24 toward the outside in the axial direction of the pin 24.
Is large, so that the lubricant existing between the axial end surface of the roller 21 and the side plate 25 is
And the pin 24 can be easily inserted. Therefore, the lubrication performance of the roller bearing 20 is improved. Note that the present invention is not limited to the above-described embodiment, and appropriate modifications and improvements can be made. A roller bearing with a pin type retainer may be provided which has both the crowning portions provided at both ends of the pin insertion hole of the first embodiment and the crowning portions provided at both ends of the pin of the second embodiment. In the above embodiment, the axial length and the crowning amount of the crowning portion provided in the pin insertion hole and the pin are configured to be equal at both ends, but are not particularly limited thereto. For example, the crowning portions provided on the pins may have different lengths and different amounts of crowning between the screw portion side and the head side. The following measurement test was performed to confirm the effect of the roller bearing with the pin type cage shown in the above embodiment. As an example, a roller bearing 20 shown in FIG. 2 in which crowning portions were provided at both ends of a pin was prepared. Also,
As a comparative example, a conventional roller bearing in which neither a pin nor a pin insertion hole is provided with a crowning portion was prepared.
A rotation test was performed on each of the roller bearings, and a contact surface pressure on a surface (hereinafter, also referred to as a sliding surface) in sliding contact with the pin insertion hole on the outer peripheral surface of the pin was determined. In this test, the conditions of the rotation test of the example and the comparative example were all the same except for the above configuration. The results of this test are shown in FIGS. In FIGS. 5 and 6, the horizontal axis represents the position of the sliding surface of the pin. The left side of the horizontal axis (the left side in the drawing) corresponds to the thread portion of the pin, and the right side of the horizontal axis (the right side in the drawing) corresponds to the head side of the pin. The vertical axis represents the magnitude of the surface pressure. FIG. 5 is a graph showing test results of the comparative example. As shown in this figure, a strong contact surface pressure (edge load) is applied to both ends of the pin having no crowning portion, and there is a risk that the pin may be partially worn and break. FIG. 6 is a graph showing test results of the example. As shown in this figure, in the pin provided with the crowning portions at both ends, the edge load as in the comparative example is eliminated, the wear of the pins at both ends is reduced, and the risk of the pins being broken is eliminated. Further, it was found that the provision of the crowning portion increased the outside of the gap between the pin and the pin insertion hole in the axial direction, so that the lubricant existing between the side plate and the axial end face became easy to enter. From the above test, it was found that the contact surface pressure at both ends of the pin and the pin insertion hole can be reduced by providing the crown with the pin.
On the other hand, the same test result can be obtained when the same test as above is performed using a roller bearing in which crowning portions are provided at both ends of a pin insertion hole as an example as in the first embodiment shown in FIG. Was. As described above, according to the present invention,
It is possible to provide a roller bearing with a pin type retainer that prevents wear of a pin and a pin insertion hole.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a first view of a roller bearing with a pin type cage of the present invention.
It is a fragmentary sectional view showing an embodiment. FIG. 2 is a second view of the roller bearing with a pin type cage of the present invention.
It is a fragmentary sectional view showing an embodiment. FIG. 3 is a partially enlarged view of the roller bearing with a pin type cage shown in FIG. 2; FIG. 4 is an overall view showing the pins of FIG. 2; FIG. 5 is a graph showing test results of a comparative example. FIG. 6 is a graph showing test results of Examples. FIG. 7 is an overall perspective view illustrating a configuration of a conventional pin type retainer. FIG. 8 is a partial sectional view of a conventional roller bearing with a pin type cage. [Description of References] Roller bearings with 10, 20 pin type retainer 11, 21 rollers 12, 22 pin type retainer 13, 23 pin insertion hole 14, 24 pin 15, 25 side plate 16, 26 screw part 17, 27 pin Heads 18, 28 Screw holes 19, 29 Tap holes 13a, 24a Crowning part

Claims (1)

Claims: 1. A pin which is inserted into a pin insertion hole passing through a shaft of a roller and rotatably supports the roller, and both ends of the pin which are formed in an annular shape and are arranged in parallel with each other. A pin type retainer having a pair of side plates for fixing the pin type retainer, wherein a crowning portion is provided at both ends of at least one of the pin insertion hole and the pin. Roller bearing.