JP2020051504A - Rocking bearing - Google Patents

Abstract

To prevent displacement of a holder holding a roller in a simple structure of a rocking bearing.SOLUTION: A rocking bearing 1 comprises a ring-shaped outer ring 2 and a ring-shaped annular assembly 7 accommodated in an annular accommodation part 5 of the outer ring 2. The annular assembly 7 includes: an arcuate holder 9 in which multiple pockets 15 for holding multiple rollers 6 therein are formed; and an arcuate fixing member 8 which is formed in an arcuate shape at both end sides of the holder 9 and fixed to the annular accommodation part 5 of the outer ring 2. A return coil spring 10 of which one end is abutted to the fixing member 8 and the other end is abutted to the holder 9 and which energizes a spring force to the holder 9, is disposed between the holder 9 and the fixing member 8.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a swing bearing that can be applied to various types of mechanical devices.

  Conventionally, a swing bearing is configured as a full roller bearing of a type in which only rollers exist around the entire circumference. The rocking bearing has a structure in which, for example, a plurality of rollers are held by an outer ring in which a metal plate is bent into a gutter-shaped cross section and an open end is bent inward. In addition, as the oscillating bearing, since the opening width on the inner peripheral side of the outer ring is shorter than the axial length of the roller, a specially shaped conical roller with both ends reduced, that is, a candle roller, is used. At present, in order to load the outer ring, the candle roller is obliquely inserted and inserted from the opening of the outer ring. Further, as a full-roller needle roller bearing, there is known a type in which a metal roller having bent edges previously engaged with the ends of the rollers at both ends of the outer ring is obliquely inserted and inserted into the outer ring. (For example, see Patent Document 1).

  Conventionally, a rocking bearing used for a variable displacement mechanism of a variable displacement plunger pump is known. The oscillating bearing is provided with a plurality of pockets formed at equal intervals in a circumferential direction on an arc-shaped cage, an outer peripheral side of the cage is arranged on an arc-shaped orbital ring, and a steel pocket is provided in the pocket of the cage. The roller that is made of plastic and the roller that is made of an elastic material filled with liquid are housed separately, and the contact between the roller and the roller that is slightly larger than the roller diameter is improved. It is described that the cage can be prevented from being displaced due to slippage of the rolling elements (for example, see Patent Document 2).

  Further, as a rocking bearing, one in which a plunger pocket or a hydraulic pump is incorporated to make the assembly compact and easy to assemble is known. The swing bearing limits a swing amount of the cage between an arc-shaped race and an arc-shaped cage that holds a rolling element that can roll along the rolling surface of the arc-shaped race. A limit mechanism is incorporated to prevent a paragraph caused by a shift movement of the retainer. The limiting mechanism for preventing the cage from being displaced includes inner teeth provided on the inner periphery of the outer race, outer teeth provided on the outer periphery of the inner race, and the inner shaft rotatably supported by the cage. And a pinion that meshes with both the teeth and the external teeth. Further, the retainer is formed of a synthetic resin molded product, whereby the internal and external teeth and the pinion mesh with each other to prevent circumferential displacement of the retainer (for example, see Patent Document 3). ).

Japanese Utility Model Publication No. 47-1603 JP-A-3-277809 JP-A-2002-61643

  However, if a special candle roller is used as the rolling element roller of the conventional oscillating bearing, the outer ring will have a special shape, and it will take a lot of time and effort to process, increasing the manufacturing cost and increasing the cost. In addition, there is a problem that it is difficult to stabilize the quality of the outer ring. In addition, since the both ends of the roller are conically reduced in diameter, the effect of correcting the roller's posture during rolling of the roller is small, and the skew of the roller is likely to occur. And the rollers fall off.

  Further, the oscillating bearing of Patent Document 1 includes an arc-shaped orbital ring and an arc-shaped cage, and when an eccentric load is applied to the oscillating bearing, the rolling element slides and holds. In order to prevent this phenomenon, in addition to steel rollers, elastic rollers made of an elastic material are used together, and the elastic rollers are elastically deformed to prevent the phenomenon. It is designed to enhance the adhesion to the wheel and prevent slippage. However, the rocking bearing of Patent Document 1 has a problem in that elastic rollers are used in addition to steel rollers.

  Further, in Patent Document 2, in order to prevent the cage from shifting, internal teeth are provided on the inner peripheral surface of the outer race, and external teeth are provided on the outer peripheral surface of the inner race, and the internal teeth and the external teeth mesh with each other. A rocking bearing in which a pinion is provided on a cage to prevent the cage from shifting is described. Further, in the swing bearing of Patent Document 2, there is a problem that the load requirement is reduced by the provision of the elastic rollers. Further, in Patent Literature 3, since the internal teeth, the external teeth, and the pinions are provided, there is a problem that the structure is complicated.

  SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, and focus on the fact that the application of use is only oscillating motion and that the direction in which the load is received is limited and constant. Rollers or rollers are provided only in a partial area to reduce the number of rollers, reduce costs and achieve weight reduction, and prevent the cage that holds the rollers of the rolling elements from being displaced by elastic members. Specifically, a ring-shaped outer ring formed in a U-shaped cross section and a ring-shaped annular assembly provided in a housing portion on the inner peripheral surface of the outer ring are provided. An arc-shaped retainer configured to dispose a swingable swing shaft, the arc-shaped retainer having an annular assembly fixed to an outer ring, and a plurality of pockets respectively holding a plurality of rollers. And an elastic member between the fixed member and the cage. And to provide a rocking bearing, characterized in that to prevent displacement by return the retainer to prevent the retainer is displaced by the swinging motion of the swing shaft by the elastic member.

According to the present invention, a rocking shaft is accommodated in a ring-shaped outer ring and an annular accommodating portion formed in the outer ring along an inner peripheral surface of the outer ring, and a swing shaft is provided on an inner peripheral side through a plurality of rolling elements. Has a ring-shaped annular assembly to be arranged,
The annular assembly includes an arc-shaped retainer that is swingably disposed in the housing portion of the outer race and has a plurality of pockets formed therein for holding the plurality of rollers, and both ends of the retainer. And a fixing member formed in an arc shape and fixed to the housing portion of the outer ring.
An elastic member is provided between the retainer and the fixing member, one end of which contacts the fixing member and the other end of which contacts the retainer to bias the retainer. Related to oscillating bearings.

  Further, in this rocking bearing, the outer ring includes an annular outer peripheral portion and a pair of annular side portions each extending in an inner diameter direction from both sides of the outer peripheral portion. Is formed in a region surrounded by the side portions.

  In this swing bearing, the cage is formed by a pair of arc portions spaced apart in the width direction and a column portion extending between the arc portions and forming a pocket in which the rollers are rotatably accommodated. Have been.

  The elastic member is a return coil spring, and guide columns are formed at both ends of the retainer, and guide fitting holes into which the guide columns are loosely fitted are formed at both ends of the fixed member. The return coil spring is loosely fitted to the guide post of the retainer.

  Alternatively, the elastic member is a return leaf spring, and one end of the return leaf spring is formed in a first contact portion abutting on an end portion of the fixing member, and the other end is in contact with an end portion of the retainer. It is formed at the second contact portion that contacts.

  As described above, the rocking bearing according to the present invention is used only for rocking motion, and is provided in the outer ring accommodating portion because the rollers are provided in a predetermined area in which the load receiving direction is limited. The annular assembly includes an arc-shaped fixing member, an arc-shaped retainer, and an elastic member interposed between the fixing member and the retainer, and the elastic member returns the retainer to its original position. Therefore, the cage that has swung following the swinging motion of the swing shaft always returns to the original position, and the displacement of the cage with respect to the outer ring is prevented by a simple structure. Further, in this oscillating bearing, a pocket is formed in the cage in a predetermined limited area where a load is applied, and only the rollers are disposed in the pocket, so that the cost can be reduced. In addition, when the swing shaft inserted into the annular assembly is reversed, a slip occurs between the roller, the outer ring and the swing shaft, and the cage cannot follow the swing, and the cage does not follow the swing motion. There is a risk of misalignment. However, according to the swing bearing of the present invention, since the retainer is urged in the swing direction by the elastic member, the displacement of the retainer can be suppressed even if slippage occurs at the time of inversion. Furthermore, in the oscillating bearing according to the present invention, since the number of rolling elements can be increased, the load applied to each roller can be reduced. Further, the oscillating bearing of the present invention does not need to provide a groove for mounting the internal teeth and the external teeth as in Patent Document 2, so that the outer ring can be made thinner and the sectional height of the oscillating bearing can be reduced. It can be reduced, and it can be made lighter and smaller.

FIG. 1 is a perspective view showing a first embodiment of a swing bearing according to the present invention. FIG. 1 is an exploded perspective view in which the oscillating bearing is disassembled into an outer ring and an annular assembly disposed in a housing portion of the outer ring. FIG. 3 is an exploded plan view of the annular assembly of FIG. 2 disassembled into a fixing member, a retainer, a return coil spring, and rollers. 1A is a plan view, and FIG. 2B is a cross-sectional view taken along a line AA of FIG. 1A is a side view, and FIG. 1B is a cross-sectional view taken along line BB of FIG. 1A. It is an expanded sectional view of the D area of FIG.5 (b). 3A and 3B show a retainer constituting an annular assembly, wherein FIG. 3A is a perspective view as viewed from an outer peripheral side, and FIG. 3B is a perspective view as viewed from an inner peripheral side. It is the perspective view which looked at the fixing member which comprises an annular assembly from the inner peripheral side. FIG. 4 is a cross-sectional view showing a concept in which a swing shaft such as a cam lever that swings is inserted into an annular assembly, showing a state of application to the swing bearing of the first embodiment. FIG. 6 is a perspective view showing a second embodiment of the swing bearing according to the present invention. FIG. 11 is an exploded perspective view showing a state where the swing bearing of FIG. 10 is disassembled into an outer ring and an annular assembly. 10A and 10B show the oscillating bearing of FIG. 10, wherein FIG. 10A is a side view of the oscillating bearing viewed from the outer peripheral side, and FIG. 10B is a cross-sectional view taken along line CC of FIG. FIG. 9 is a perspective view showing a third embodiment of the swing bearing according to the present invention. FIG. 14 is an exploded perspective view showing a state in which the rocking bearing of FIG. 13 is separated into an outer ring and an annular assembly. FIG. 14 is a perspective view showing an arc-shaped fixing member constituting the swing bearing of FIG. 13. FIG. 14 is a perspective view showing a return leaf spring provided in an annular assembly constituting the swing bearing of FIG. 13. 13A is a plan view from the axial direction showing the annular assembly, and FIG. 13B is an enlarged plan view showing a region E of FIG.

  Hereinafter, embodiments of a swing bearing according to the present invention will be described with reference to the drawings. First, a first embodiment of a rocking bearing according to the present invention will be described with reference to FIGS. The oscillating bearing 1 according to the present invention is accommodated along the inner peripheral surface 29 of the outer ring 2 in, for example, a ring-shaped outer ring 2 provided on a mating member and an annular accommodating portion 5 formed on the outer ring 2. On the inner peripheral side, there is provided a ring-shaped annular assembly 7 on which a swing shaft 19 is arranged via rollers 6 which are rolling elements. The outer ring 2 is formed in a ring shape, that is, an annular shape formed in a U-shaped cross section, that is, a U-shaped cross section. More specifically, the outer ring 2 is formed in a U-shaped cross section from a pair of annular outer portions 3 and a pair of annular side portions 4 extending in the radial direction from both sides of the outer portion 3. The annular housing portion 5 formed on the outer race 2 is formed in a region surrounded by the outer peripheral portion 3 and a pair of annular side portions 4 extending in the radial direction from both sides of the outer peripheral portion 3, and is formed on the inner peripheral surface side. Is formed with an opening through which an arc-shaped retainer 9 can be disposed. The outer ring 2 is formed, for example, by bending a strip-shaped metal plate made of SCM415 (chromium molybdenum steel) by press working to form a bottom portion, that is, an outer peripheral portion 3, and side portions 4 extending inward to both widthwise sides of the outer peripheral portion 3. It is formed in a U-shaped cross section, thereby forming an annular receiving portion 5. An inner peripheral surface 29 on the inner peripheral side of the outer ring 2 is formed on a raceway surface on which the rollers 6 of the rolling elements roll. Since the outer ring 2 is formed by, for example, press working, it is easier to secure the accuracy of the surface roughness than that formed by grinding or the like. The side portion 4 of the outer ring 2 is set to a size, that is, a size such that the annular assembly 7 does not come off in the axial direction when the annular assembly 7 is disposed in the annular housing portion 5 on the inner peripheral side of the outer ring 2. Is formed.

  In the swing bearing 1 according to the present invention, in particular, the annular assembly 7 is provided with a plurality of pockets 15 that are swingably disposed in the annular housing portion 5 of the outer ring 2 and in which only the plurality of rollers 6 are respectively held. An arc-shaped retainer 9 formed, and an arc-shaped fixing member formed in an arc shape extending in an arc shape from one end side to the other end side of the retainer 9 and fixed to the annular accommodating portion 5 of the outer ring 2. And a member 8. Further, between the retainer 9 and the fixing member 8, the annular assembly 7 has one end in contact with the fixing member 8 and the other end in contact with the retainer 9 to urge the retainer 9 with a spring force. A return coil spring 10 as an elastic member is provided. The arc-shaped retainer 9 is formed by a pair of arc portions 17 spaced apart in the width direction and a column portion 16 extending between the arc portions 17 and forming a pocket 15 in which the rollers 6 are rotatably accommodated. I have. As shown in FIG. 7, the cage 9 is formed with three pockets 15 having openings 14 into which the rollers 6 can be inserted from the outer peripheral surface, for example, three in one opening 14 along the circumferential direction. ing. Each pocket 15 is formed so as to be able to hold, for example, three rollers or rollers 6. A plurality of windows 13 that expose a part of each roller 6 are formed on the inner peripheral surface of the retainer 9. Since the window width of each window portion 13 is set smaller than the diameter of the roller 6, the window portion 13 is formed in a shape that holds the roller 6 in a so-called inner diameter so that the roller 6 does not fall on the inner peripheral side of the retainer 9. . The circumferential length of the opening 14 of the pocket 15 is set smaller than the sum of the diameters of the rollers 6 held in the pocket 15, as shown in FIG. This makes it difficult for the roller 6 to fall off from the outer peripheral side of the cage 9. Guide columns 11 are formed on both end surfaces 31 of the cage 9 in the circumferential direction. The guide column 11 is formed to have a diameter that can be inserted into the return coil spring 10. The fixing member 8 and the retainer 9 are made of, for example, a resin material having good slidability, for example, a synthetic resin such as nylon 66 (PA66), nylon 46 (PA46), or polyetheretherketone resin (PEEK). ing.

  In the first embodiment, a return coil spring 10 is used as an elastic member constituting the annular assembly 7. The retainer 9 constituting the annular assembly 7 has guide columns 11 formed at both ends thereof. The fixing member 8 has guide fitting holes 12 at both ends thereof, into which the guide posts 11 are loosely fitted. A return coil spring 10 is loosely fitted to the guide column 11 of the retainer 9. The fixing method for fixing the fixing member 8 to the outer ring 2 can be fixed by integrally molding the resin fixing member 8 on the inner peripheral side of the outer ring 2. In this case, by forming a hole in the outer peripheral portion 3 of the outer ring 2 and injecting resin from the hole to integrally mold the fixing member 8 with the outer ring 2, the fixing member 8 can be firmly fixed to the outer ring 2. Of course, the fixing method of fixing the fixing member 8 to the outer ring 2 is not limited to the integral molding, but can be achieved by bonding with an adhesive, fitting of unevenness, or the like. The return coil spring 10 is configured such that one end contacts the retainer 9 and the other end contacts the fixing member 8. In the swing bearing 1, the retainer 9 can be urged in the swing direction by the spring force of the return coil spring 10. When the swing bearing 1 swings, the retainer 9 returns to the original position. Swing to return.

  FIG. 7 shows an arc-shaped retainer 9 constituting the annular assembly 7, and FIG. 8 shows an arc-shaped fixing member 8 constituting the annular assembly 7. The annular assembly 7 is formed by connecting an arc-shaped retainer 9 and an arc-shaped fixing member 8 in a circumferential direction. Specifically, the arc-shaped fixing member 8 has guide fitting holes 12 formed at both end surfaces 32 in the circumferential direction. Further, the arc-shaped retainer 9 is provided with guide columns 11 each extending in an arc shape from both end surfaces 31 thereof. Guide supports 11 provided on the retainer 9 are slidably inserted into guide fitting holes 12 formed in the fixing member 8. The guide fitting hole 12 formed in the fixing member 8 may be set so as to be at least deeper than the stroke of the swinging motion of the swinging shaft 19 as shown in FIG. It is something that may be done. Note that a lubricant can be applied to the guide fitting holes 12 and the guide posts 11.

  Next, the use state, that is, the operation of the swing bearing 1 of the first embodiment will be described with reference to FIG. FIG. 9 shows an example in which the housing 18 is used as a mating member. The swing shaft 19 that swings is inserted into the hollow hole 30 of the annular assembly 7. The swing shaft 19 swings in the swing direction as indicated by an arrow 41 in FIG. The occupation range 43 of the roller 6 loaded in the arc-shaped cage 9 in the oscillating bearing 1 is set so as to be larger than the swing amount (oscillation angle) of the oscillating shaft 19. The load area is configured. Further, with respect to the oscillating bearing 1, a load is applied to the cage 9 from the oscillating shaft 19 in the radial direction of the oscillating bearing 1. In the swing bearing 1, the load direction from the swing shaft 19 is constant, and the rollers 6 which receive the maximum load accompanying the swing of the swing shaft 19 change sequentially. Of course, the swing bearing 1 is. It can be used even when the load direction fluctuates following the swinging motion of the swing shaft 19. The clearance other than the position of the roller 6 is set so that there is a clearance between the roller 6 and the pivot shaft 19, and the position other than the roller 6 is configured not to receive a load. In the first embodiment formed as described above, when the swing shaft 19 swings, the cage 9 receiving the load also swings. At this time, the guide column 11 of the retainer 9 advances and retreats in the guide fitting hole 13 of the fixing member 8, so that a stroke necessary for swinging is secured. Here, for example, when the swinging shaft 19 is inverted, a slip occurs between the outer ring 2 and the swinging shaft 19 and 6 due to vibration of the device or the like. May not be able to follow. However, even in such a case, since the cage 9 is urged in the swing direction by the return coil spring 10, the cage 9 can follow the swing of the swing shaft 19, The displacement of the container 9 is suppressed. On the other hand, depending on the vibration of the device, the swing shaft 19 may move, and the swing shaft 19 may come into contact with the fixing member 8 other than the configuration 6. In such a case, in the first embodiment, since the fixing member 8 is formed of a resin material having high slidability, the rocking motion is not hindered even when the rocking shaft contacts. I have. Further, in the first embodiment, since the fixing member 8 not in contact with the swing shaft 19 is also formed in an arc shape, the swing shaft 19 is slidably contacted with the fixed member 8 when the swing shaft 19 is mounted. It is configured so that it can be easily installed. That is, when the fixing member 8 is not provided, a large gap is formed above the swing shaft 19, so that the swing shaft 19 moves in the direction of the gap, and mounting may be difficult. By filling the gap with the arc-shaped fixing member 8, wobbling of the swing shaft 19 is suppressed, and the swing shaft 19 can be easily attached. In principle, it is sufficient if the fixing members 8 are provided only at both ends of the retainer 9. However, if there is nothing at the position of the outer ring 2 facing the retainer 9, it is difficult to insert the swing shaft 19. The fixing member 8 is also formed in an arc shape. Further, the oscillating bearing 1 can be used for various devices that perform oscillating motion within a certain range. Although the first embodiment is an example in which the adjacent rollers 6 are in contact with each other, a configuration can be made such that a gap is formed between the adjacent rollers 6. Also, a known elastic member such as rubber can be used in place of the return coil spring 10.

  Next, a second embodiment of the swing bearing according to the present invention will be described with reference to FIGS. The oscillating bearing 1A of the second embodiment is different from the oscillating bearing 1 of the first embodiment in that an arc-shaped fixing member and a pair of arc-shaped retainers 26 and 27 are provided, respectively. Are arranged on both sides of the side arc-shaped fixing member 28, and the cage is constituted by an upper arc-shaped cage 26 and a lower arc-shaped cage 27. That is, in the swing bearing 1A of the second embodiment, retainers 26 and 27 are disposed above and below it, and fixing members 28 are disposed on the left and right between the retainers 26 and 27. In other configurations, The same functions as those of the fixing member 8 and the retainer 9 of the first embodiment are performed. In the swing bearing 1A of the second embodiment, the arc-shaped fixing member 28 constituting the annular assembly 7A is formed in a pipe shape as shown in FIG. Are formed in a shape penetrating the guide hole, but this function is the same as that of the first embodiment, and the guide post 11 is slidably fitted in the guide fitting hole 12.

  Next, a third embodiment of the swing bearing according to the present invention will be described with reference to FIGS. The swing bearing 1B of the third embodiment is the same except that the annular assembly 7A is different from that of the first embodiment. The elastic member constituting the annular assembly 7A is a return leaf spring 20. The return leaf spring 20 is formed at the first contact portion 25 having one end contacting the end surface 32 of the arc-shaped fixing member 21 and the second contact portion contacting the other end with the end surface 31 of the arc-shaped retainer 9. 24. That is. The point is that the return leaf spring 20 is arranged between the fixing member 21 and the retainer 9, the stroke of the retainer 9 is secured by the expansion and contraction of the return leaf spring 20, and the retainer 9 is urged. . The fixing member 21 is formed in a belt shape, and engagement step portions 22 are formed at both ends thereof. The first contact portion 25 at the end of the return leaf spring 20 is engaged and fixed to the engagement step portions 22. ing. Again, the tip of the first contact member 25 is sandwiched between the inner peripheral surface of the outer race 2 and the engagement step 22, so that the return leaf spring 20 does not easily fall off. A first contact portion 24 at the other end of the return leaf spring 20 abuts and is fixed to the end surface 31 of the retainer 9. As shown in FIG. 16, the return leaf spring 20 is formed, for example, by press working. That is, since the return leaf spring 20 is less expensive than the return coil spring, the cost can be reduced.

  The oscillating bearing according to the present invention is preferably applied to various types of mechanical devices.

DESCRIPTION OF SYMBOLS 1, 1A, 1B swing bearing 2 Outer ring 3 Outer peripheral part 4 Side part 5 Annular accommodation part 6 Roller 7, 7A Annular assembly 8 Fixed member 9 Cage 10 Return coil spring (elastic member)
DESCRIPTION OF SYMBOLS 11 Guide support | pillar 12 Guide fitting hole 13 Window part 14 Opening part 15 Pocket 16 Column part 17 Arc part 19 Oscillating axis 20 Return leaf spring (elastic member)
Reference Signs List 22 engagement step portion 24 second contact portion 25 first contact portion 29 inner peripheral surface 30 hollow hole 31, 32 end surface

Claims (5)

A ring-shaped outer ring, and a ring housed along an inner peripheral surface of the outer ring in an annular accommodating portion formed in the outer ring, and a swing shaft disposed on the inner peripheral side via a plurality of rolling elements rollers. With an annular assembly
The annular assembly includes an arc-shaped retainer that is swingably disposed in the housing portion of the outer race and has a plurality of pockets formed therein for holding the plurality of rollers, and both ends of the retainer. And a fixing member formed in an arc shape and fixed to the housing portion of the outer ring.
An elastic member is provided between the retainer and the fixing member, one end of which contacts the fixing member and the other end of which contacts the retainer to bias the retainer. Swing bearing.   The outer ring includes an annular outer peripheral portion and a pair of annular side portions extending in the radial direction from both sides of the outer peripheral portion, and the housing portion is a region surrounded by the outer peripheral portion and the pair of side portions. The oscillating bearing according to claim 1, wherein the oscillating bearing is formed of:   The retainer is formed of a pair of arc portions spaced apart in the width direction and a column portion extending between the arc portions and forming a pocket in which the rollers are rotatably accommodated. 3. The swing bearing according to 1 or 2.   The elastic member is a return coil spring, and guide posts are formed at both ends of the retainer, and guide fitting holes into which the guide posts are loosely fitted are formed at both ends of the fixed member. The oscillating bearing according to any one of claims 1 to 3, wherein the return coil spring is loosely fitted to the guide post of the retainer.   The elastic member is a return leaf spring, and the return leaf spring is formed at a first contact portion where one end is in contact with an end of the fixing member, and a second contact is formed at the other end with an end of the retainer. The oscillating bearing according to any one of claims 1 to 3, wherein the oscillating bearing is formed in a contact portion.

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