JP2007064392A - Oscillating bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an oscillating bearing ipreventing damage of a cage by relieving a stress concentration on a step part formed in a column part. <P>SOLUTION: This oscillating bearing comprises an arcuate race 12 disposed in an arcuate recessed part formed in a housing, a plurality of rollers 13 disposed along the inner peripheral surface of the race 12 and oscillatingly supporting a swash plate, and the cage 14 having a pair of arcuate members 14a, 14b and the column member 14c. The end face of the column member 14c comprises a contact end face 14d in contact with the arcuate member 14a and a non-contact end face 14e not abutting on the arcuate member 14a by retreating from the contact end face 14d to the center side. A step part 14f formed between t he contact end face 14d and the non-contact end face 14e is formed in a curved surface. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a rocking bearing that supports a swash plate or the like so as to freely rock.

  Conventionally, a rocking bearing is used as a bearing for supporting a swash plate of a swash plate type plunger pump, as shown in Japanese Patent Laid-Open No. 2002-286041 (Patent Document 1). In the swash plate type plunger pump described in the publication, a swash plate 6 is disposed in an arcuate recess 5 a provided in a housing 5 via a rocking bearing 1 as shown in FIG.

  In this swash plate type plunger pump, when the swash plate 6 swings, the plunger 7 disposed on the flat surface 6a of the swash plate 6 moves up and down to suck and pump oil. Further, in order to limit the swing range of the swash plate 6 within a certain range, the swash plate 6 and the housing 5 are connected by a swing amount regulating member 8.

  The oscillating bearing 1 used in such a swash plate plunger pump is disposed along the raceway ring 2 fitted in the arcuate recess 5a and the inner peripheral surface of the raceway ring 2 so that the swash plate 6 can freely oscillate. A plurality of rollers 3 to be supported on the holder and a cage 4 having a pocket for accommodating the plurality of rollers. Further, the race ring 2 has a positioning piece 2a that engages with the positioning hole 5b of the housing 5 at its circumferential end in order to fix the position in the arc-shaped recess 5a.

  As shown in FIG. 6, the cage 4 includes a pair of arcuate members 4a and 4b along the raceway ring 2 and a plurality of column members 4c arranged between the pair of arcuate members 4a and 4b. A swing amount regulating member 8 passes through the retainer 4, and the swing amount is regulated similarly to the swash plate 6. Alternatively, as another means for regulating the swing amount of the cage 4, a swing bearing in which engagement pieces are provided at both ends of the raceway ring 2 is also known.

  Further, in order to avoid interference between the column member 4c and the swash plate 6, the end surface of the column member 4c has a contact end surface 4d that contacts the arc-shaped member 4a, and recedes toward the center side from the contact end surface 4d. And a non-contact end face 4e that does not abut. Furthermore, the pocket which accommodates the roller 3 is formed between the adjacent pillar members 4c.

The cage 4 having the above configuration is generally manufactured by injection molding of a resin material. As shown in FIG. 7, the stepped portion 4f formed between the contact end surface 4d and the non-contact end surface 4e is: It becomes a linear shape.
JP 2002-286041 A

  In the rocking bearing 1 having the above-described configuration, the roller 3 rotates around the roller center (hereinafter referred to as “spinning motion”) along with the rocking of the swash plate 6 and moves along the raceway surface of the bearing ring 2 ( (Hereinafter referred to as “revolving motion”), and the cage 4 also moves following the roller 3.

  However, since the movable range of the cage 4 is regulated by the engagement pieces 2b provided at both ends of the raceway ring 2, if the swash plate 6 swings beyond the movable range of the cage 4, the cage 4 The column member 4 c prevents the roller 3 from revolving. This is conspicuous in a rocking bearing of a type in which the rocking amount of the cage 4 is regulated by engagement pieces provided at both ends of the raceway ring 2.

  At this time, the column member 4c receives a large load from the roller 3, and stress concentration occurs in the stepped portion 4f, and the cage 4 may be damaged. This is likely to occur when the center of the swing range of the swash plate 6 is shifted from the center of the raceway ring 2.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a rocking bearing that can alleviate stress concentration at a step portion provided in a column portion and prevent breakage of a cage.

  The rocking bearing according to the present invention is disposed between an arc-shaped raceway ring, a plurality of rollers disposed along an inner peripheral surface of the raceway ring, a pair of arc-shaped members, and a pair of arc-shaped members. A cage having a plurality of column members and having pockets for accommodating the plurality of rollers between the adjacent column members; The end surface of the column member has a contact end surface that contacts the arc-shaped member and a non-contact end surface that retreats from the contact end surface toward the center and does not contact the arc-shaped member. The step portion formed therebetween has a curved surface.

  By adopting the above configuration, it is possible to alleviate the stress concentration generated in the step portion formed between the contact surface and the non-contact surface, so even when the swash plate swings beyond the movable range of the cage A rocking bearing capable of preventing breakage of the cage can be obtained.

  Preferably, the cage is formed of a resin material. When a cage is manufactured by injection molding a resin material, the stepped portion has a linear shape. In addition, since the resin material has a lower strength than the races and rollers, there is a high possibility that the cage is damaged due to stress concentration. Therefore, by setting the resin cage to the above configuration, a better effect can be expected with respect to preventing breakage of the cage.

  According to the present invention, a rocking bearing capable of preventing breakage of the cage can be obtained by relaxing the stress concentration generated in the step portion of the cage.

  A rocking bearing 11 according to an embodiment of the present invention will be described with reference to FIG.

  As shown in FIG. 2A, the rocking bearing 11 is disposed along an arcuate race ring 12 disposed in an arcuate recess 15 a provided in the housing 15, and an inner peripheral surface of the race ring 12. And a plurality of rollers 13 that swingably support the swash plate 16 and a retainer 14 that holds the intervals between the plurality of rollers 13.

  As shown in FIG. 2 (b), the race 12 has a positioning piece 12a that engages with a positioning hole 15b of the housing 15 at its circumferential end in order to fix the position in the arcuate recess 15a. The engagement piece 12b for restricting the amount of rocking of the cage 14 in the circumferential direction and the flange 12c for guiding the end face of the roller 13 on one side in the width direction of the race 12 are made of steel plates. Manufactured by pressing.

  As shown in FIG. 3, the retainer 14 includes a pair of arcuate members 14 a and 14 b along the raceway ring 12 and a plurality of column members 14 c disposed between the pair of arcuate members 14 a and 14 b. The pockets for accommodating the rollers 13 are formed between adjacent column members 14c. The cage 14 is manufactured by injection molding a resin material.

  In order to avoid interference between the column member 14c and the swash plate 16, the end surface of the column member 14c is a contact end surface 14d that contacts the arc-shaped member 14a, and recedes toward the center side from the contact end surface 14d. And a non-contact end face 14e that does not abut. Further, as shown in FIGS. 1A and 1B, a stepped portion 14f formed between the contact end surface 14d and the non-contact end surface 14e is a curved surface.

  The cage 14 configured as described above can relieve stress concentration generated in the stepped portion 14f by forming the stepped portion 14f as a curved surface. As a result, even when the column portion 14c of the retainer 14 hinders the revolving motion of the roller 13 due to the swash plate 16 swinging beyond the movable range of the retainer 14, the swash plate 16 is retained by the load applied from the roller 13. The device 14 can be effectively prevented from being damaged.

  Moreover, in the rocking bearing 11, the example which provided the positioning piece 12a in the circumferential direction edge part of the bearing ring 12, and fixed the position in the circular-arc-shaped recessed part 15a was shown, but it does not restrict to this. Positioning protrusions 22a may be provided on the outer peripheral surface as in a rocking bearing 21 shown in FIGS. 4 (a) and 4 (b). In this case, the positioning hole 25b of the housing is provided at a position corresponding to the positioning projection 22a. The basic configuration of the oscillating bearing 21 is the same as that of the oscillating bearing 11, and the description thereof will be omitted.

  Furthermore, the present invention can be applied to any cage used for the rocking bearing 11, but as in the above-described embodiment, the step 14f called injection molding is manufactured by a manufacturing method that tends to be a linear shape. In addition, by applying to the cage 14 made of resin having a lower strength than the race 12 or the roller 13, a high effect can be expected for preventing the cage 14 from being damaged.

  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 a rocking bearing that supports a swash plate or the like so as to freely rock.

It is the elements on larger scale of the rocking | fluctuation bearing which concerns on one Embodiment of this invention, Comprising: (a) is an enlarged view of the P section of FIG. 3, (b) is an enlarged view of the Q section of FIG. It is a figure which shows the rocking | fluctuation bearing which concerns on one Embodiment of this invention, Comprising: (a) is sectional drawing, (b) is a perspective view of a bearing ring. It is sectional drawing of the circumferential direction end surface of the holder | retainer used for FIG. It is a figure which shows the rocking | fluctuation bearing which concerns on other embodiment of this invention, Comprising: (a) is sectional drawing, (b) is a perspective view of a bearing ring. It is a figure which shows the conventional rocking | fluctuation holder. It is sectional drawing of the circumferential direction end surface of the holder | retainer used for FIG. It is an enlarged view of the R section of FIG.

Explanation of symbols

  1,11,21 Oscillating bearing, 2,12,22 bearing ring, 2a, 12a positioning piece, 22a positioning protrusion, 12b, 22b engaging piece, 12c, 22c collar, 3,13,23 roller, 4,14 , 24 Cage, 4a, 4b, 14a, 14b Arc member, 4c, 14c Column member, 4d, 14d Contact end surface, 4e, 14e Non-contact end surface, 4f, 14f Stepped portion, 5, 15, 25 Housing, 5a, 15a, 25a Arc-shaped recess, 5b, 15b, 25b Positioning hole, 6, 16, 26 Swash plate, 6a, 16a, 26a Flat surface, 7 Plunger, 8 Oscillation amount regulating member.

Claims (2)

Arc-shaped raceway,
A plurality of rollers disposed along an inner peripheral surface of the raceway;
A cage having a pair of arcuate members and a plurality of column members disposed between the pair of arcuate members, and having a pocket for accommodating the plurality of rollers between the adjacent column members;
The end face of the column member has a contact end face that comes into contact with the arcuate member and a non-contact end face that retreats from the contact end face toward the center and does not come into contact with the arcuate member,
The step part formed between the said contact end surface and the said non-contact end surface is a rocking | fluctuation bearing which has a curved surface. The rocking bearing according to claim 1, wherein the cage is made of a resin material.

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