JP4172972B2 - Swing bearing - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rocking bearing for swingably supporting a movable member such as a swash plate incorporated in a hydraulic pump, a hydraulic motor, or an HST (hydrostatic transmission).
[0002]
[Prior art]
In hydraulic pumps, hydraulic motors, and HSTs used in construction machines and agricultural machines, the operating speed of the machine can be adjusted by adjusting the angle of the swash plate incorporated in the apparatus. Since a large load of several tons is applied to the swash plate, a rocking bearing using a roller as a rolling element is incorporated for the purpose of reducing torque when adjusting the angle of the swash plate.
[0003]
FIG. 5 shows an example of the usage state of such a rocking bearing (see Patent Document 1). The oscillating bearing is fixed to a fixed member 51 and has a raceway ring 52 having a concave arcuate rolling surface 52a, a plurality of rollers 53 arranged along the rolling surface 52a, and the rollers 53. A swash plate 55 having a convex arcuate surface 55a is supported by each roller 53 so as to be swingable. Each roller 53 is housed in each pocket formed by both side portions 56 of the retainer 54 and a plurality of pillar portions 57 inserted between the both side portions 56, like a general radial bearing, and can freely roll. Is held in.
[0004]
[Patent Document 1]
JP 61-215812 (Fig. 3)
[0005]
Oscillating bearings as described above often require strength against static loads compared to general radial bearings. Therefore, it is desirable to design with an emphasis on static load rating. For this purpose, arrange as many rollers as possible. It is effective to do. However, the number of rollers that can be arranged is limited because the retainer column portion is interposed between adjacent rollers, and it is difficult to increase the static load rating beyond a certain limit.
[0006]
Of these types of oscillating bearings, the type in which the bearing is fixed to the fixed member using a hole penetrating from the rolling surface of the raceway to the fixed member side, There is a case where it is feared that the fixing hole is applied. However, if the rollers are arranged so as to avoid the position applied to the hole, the number of the rollers is reduced as compared with the conventional case, and the static load rating is reduced.
[0007]
On the other hand, prior to the present invention, the present applicant has proposed a rocking bearing in which a larger number of rollers can be arranged than before by eliminating the column portion of the cage (Japanese Patent Application No. 2001-129448). ). As shown in FIGS. 6A and 6B, this rocking bearing is provided with projections 62a at both ends in the axial direction of the rollers 62 arranged along the rolling surface 61a of the bearing ring 61. The roller 62 is held by fitting the portion 62 a into the groove 64 a of the pair of side portions 64 connected at both ends in the circumferential direction of the cage 63, and the cage 63 has no column portion. Therefore, the number of rollers 62 that can be arranged can be increased as compared with the conventional case. However, since it is necessary to process the end face of the rollers 62 to form the protrusions 62a, the manufacturing cost of the rollers 62 is high, and the entire bearing is expensive. It will become something. In addition, since the design of the roller diameter can be restricted, there is a problem that the degree of freedom of design of the entire bearing is reduced.
[0008]
[Problems to be solved by the invention]
Accordingly, an object of the present invention is to provide a rocking bearing that has a large number of rollers that can be arranged and can be manufactured at low cost.
[0009]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the present invention is a fixed ring, a race ring having a concave arc-shaped rolling surface, and a plurality of rollers arranged along the concave arc-shaped rolling surface, Convex arcuate surface comprising a pair of side portions extending in an arc shape along the rolling surface and a cage for holding the rollers in a freely rolling manner by a plurality of column portions extending across the both side portions. A swinging bearing that swingably supports a movable member having a contact with each of the rollers, and means for swingably engaging the cage with the raceway, and a raceway circumferential direction of the cage A retaining means from the end is provided, the raceway and the cage are integrated, and each column portion of the cage passes through a central axis of each roller and a convex arcuate surface of the movable member The structure formed between the two was adopted.
[0010]
That is, it is unnecessary to prevent the roller from falling from the outer peripheral side of the cage by integrating the bearing ring and the cage, and each column portion of the cage passes through the central axis of each roller. Formed between the surface and the convex arcuate surface of the movable member so that each roller does not fall off from the inner circumferential side of the cage, so that the pillar portion of the cage does not intervene between adjacent rollers In this way, the number of rollers that can be arranged was increased without applying special processing to the rollers.
[0011]
By making the arrangement of the rollers into a full-roller arrangement, a static load rating equivalent to a full-roller bearing can be ensured.
[0012]
Further, when the raceway has a hole for fixing to the fixing member on the rolling surface, the rollers are placed on the rolling surface excluding the position of the fixing hole of the raceway. Can be arranged to roll.
[0013]
In other words, when the bearing ring has a fixing hole, even if it is designed so that each roller does not hit the fixing hole of the bearing ring during rolling, the number of rollers will not decrease compared to the conventional one, and it will be the same as before. The above static load rating is obtained.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 3 show a first embodiment. As shown in FIGS. 1 (a) and 1 (b), the oscillating bearing is arranged along a raceway ring 1 having a concave arc-shaped rolling surface 1a and the concave arc-shaped rolling surface 1a. It comprises a plurality of rollers 2 and a cage 3 that holds each roller 2 in a freely rollable manner. The bearing ring 1 is fixed to a fixed member (not shown), and the movable member 4 having a convex arcuate surface 4a is fixed to each roller. 2 is supported so that it can swing freely. In addition, although the bearing ring 1 is shape | molded by cutting out from steel materials, you may shape | mold by pressing a steel plate. The cage 3 is formed of a resin material in order to facilitate the assembly of the rollers 2.
[0015]
The bearing ring 1 is provided with flanges 5 extending along the end faces of the rollers 2 on both side ends over the entire length in the circumferential direction, and is engaged with the cage 3 at one flange part 5 as will be described later. ing. Moreover, the circumferential direction length is formed longer than the holder | retainer 3, and the stopper 6 which opposes the circumferential direction end surface of the holder | retainer 3 at intervals is provided in the circumferential direction both ends, and this holder | retainer 6 holds 3 is prevented from falling off from one end in the circumferential direction.
[0016]
On the other hand, the retainer 3 has a plurality of column portions 8 extending between a pair of side portions 7 extending in an arc shape along the rolling surface 1 a of the raceway ring 1. At the position, there is provided an engagement portion 9 having a cross-section in cross section and a tip portion of which is formed along the curved portion of the outer surface of the flange portion 5 of the bearing ring 1. ing. The engaging portion 9 swings while being guided by the flange portion 5 while gripping the flange portion 5 together with the roller 2 disposed at a position facing the engaging portion 9.
[0017]
As shown in FIG. 1C, each column portion 8 of the cage 3 is formed between an arcuate surface 10 passing through the central axis of each roller 2 and a convex arcuate surface 4 a of the movable member 4. Each roller 2 is held so as not to drop from the inner peripheral side of the cage 3. This is because the roller 2 is incorporated into the raceway 1 and the cage 3 that are integrated as described above, and therefore the column portion 8 does not need to prevent the roller 2 from falling off from the outer peripheral side of the cage 3.
[0018]
Therefore, in this oscillating bearing, the column portion 8 of the cage 3 is not interposed between the adjacent rollers 2, and a larger number of rollers 2 can be arranged than in the prior art to increase the static load rating. . Although the interval between the rollers 2 can be set freely, in the example of FIG. 1, each roller 2 is assembled in a full roller state without a gap, and a static load rating equivalent to a full roller bearing is secured. In addition, since it is not necessary to apply special processing to the roller 2, it can be manufactured at low cost, and there are few design restrictions as the entire bearing.
[0019]
In addition, although the example which provided the collar part 5 in the both sides of the track ring 1 was shown in FIG. 1, the collar part 5 may be provided only in the one side of the track ring 11, as shown in FIG.
[0020]
Further, the method of integrating the raceway and the cage is not limited to the above-described method, and the cage is engaged with the raceway so as to be swingable, and the cage is prevented from coming off from the circumferential end of the raceway. Any means may be used as long as it can be done.
[0021]
For example, as a modification of the circumferential retaining means of the cage, as shown in FIG. 3, the cage 12 is formed longer than the race ring 13, and the circumferential end face of the race ring 13 is formed at both circumferential ends. It is also possible to employ one provided with a stopper 14 that is opposed to each other at an interval.
[0022]
Various positions can be selected for the position where the race ring and the cage are engaged, and they may be engaged at a plurality of positions in the circumferential direction.
[0023]
4 (a) and 4 (b) show a second embodiment. In this oscillating bearing, the bearing ring 15 is a single-sided type as in the example of FIG. 2, and a through hole 15b for fixing the bearing to a fixing member (not shown) is provided at the circumferential center position of the rolling surface 15a. Is provided. A dummy portion 19 having a trapezoidal cross section is provided on both side portions 18 at the center position in the circumferential direction of the cage 16 in the same manner as the column portions 17 provided at other positions. Even if the cage 16 is swung at a predetermined angle while moving, it does not reach the fixing hole 15b of the race 15. Note that the cage 16 is engaged with the race 15 at a position slightly shifted to the left side of the drawing from the center in the circumferential direction. The configuration of the other parts is the same as that of the first embodiment, including that the retainer 16 is prevented from coming off in the circumferential direction by the stopper 14 at the circumferential end of the retainer 16 as in the example of FIG. It is.
[0024]
That is, in this embodiment, each roller 2 is arranged so as to roll on the rolling surface 15a excluding the position of the fixing hole 15b of the bearing ring 15, but the position of the dummy portion 19 of the cage 16 Since the rollers 2 are arranged without any gaps, the number of rollers and the static load rating equal to or greater than those of the prior art can be obtained.
[0025]
【The invention's effect】
As described above, the oscillating bearing according to the present invention integrates the bearing ring and the cage, and each column portion of the cage is formed by the arc-shaped surface passing through the center axis of each roller and the convex arc-shaped surface of the movable member. Since it is formed between the adjacent rollers so that the pillar portion of the cage does not intervene between them, the number of rollers that can be arranged is larger than in the prior art, and the static load rating can be increased. Moreover, since it is not necessary to apply special processing to the rollers, the rollers can be manufactured at a low cost, and there are few design restrictions for the entire bearing.
[0026]
Also, when there are fixing holes on the raceway surface of the race, even if each roller is arranged so as to roll on the rolling surface excluding the position of the fixing hole, the number of rollers is larger than before. The static load rating equal to or higher than the conventional one can be obtained.
[Brief description of the drawings]
FIG. 1a is a partially cutaway front view of a rocking bearing of a first embodiment, b is a sectional view taken along line II of a, and c is an enlarged front view of a main part of a. FIG. FIG. 3 is a sectional view showing a modification of the raceway shape corresponding to FIG. 1 (b). FIG. 3 is a partially cutaway front view showing a modification of the circumferential retaining means of the cage in FIG. FIG. 5 is a partially cutaway front view of a rocking bearing according to a second embodiment, and b is a cross-sectional view taken along line IV-IV in FIG. 6a is a longitudinal front view of another example of a conventional rocking bearing, and b is a cross-sectional view taken along line VI-VI in FIG.
DESCRIPTION OF SYMBOLS 1 Track ring 1a Rolling surface 2 Roller 3 Cage 4 Movable member 4a Convex arcuate surface 5 ridge part 6 Stopper 7 Side part 8 Column part 9 Engagement part 10 Arcuate surface 11 Track ring 12 Holder 13 Track ring 14 Stopper 15 Raceway 15a Rolling surface 15b Hole 16 Cage 17 Pillar part 18 Side part 19 Dummy part

Claims (4)

A bearing ring fixed to the fixing member and having a concave arc-shaped rolling surface, a plurality of rollers arranged along the concave arc-shaped rolling surface, and a pair extending in an arc shape along the rolling surface And a plurality of pillars extending between the two sides, and a holder for holding the rollers in a rollable manner, and a movable member having a convex arcuate surface is brought into contact with the rollers. In the swing bearing that is swingably supported , at least one side end of the race is provided with a flange portion that extends along an end surface of the roller, and an engagement portion that engages with the flange portion is provided on the cage. The retainer is guided by the flange while swinging while holding the flange together with the rollers disposed at positions where the retainer faces the engagement portion. It provided retaining hands stage from HanawaAmane direction end, by integrating the cage and the bearing ring, each pillar of the cage Rocking bearing, characterized in that formed between the convex arcuate surface of the arcuate surface and the movable member passing through the central axis of each roller a.   The rocking bearing according to claim 1, wherein the roller arrangement is a full roller arrangement.   The bearing ring has a hole for fixing to the fixing member on the rolling surface, and the rollers roll on the rolling surface excluding the position of the fixing hole of the bearing ring. The rocking bearing according to claim 1, which is arranged in a row. The means for arranging the rollers so as to roll on a rolling surface excluding the position of the fixing hole of the track ring passes a dummy part that is close to and faces the fixing hole on both sides of the cage. The rocking bearing according to claim 3, wherein the roller is not applied to the fixing hole even if the rollers roll with a cage at a predetermined angle while rolling.

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