JP5544899B2 - Cage assembly and one-way clutch - Google Patents

Description

  The present invention relates to a cage assembly including a cage and a biasing member and a one-way clutch including the cage assembly.

  Conventionally, as a cage assembly used in a one-way clutch, there is one described in Japanese Patent Laid-Open No. 2001-50296 (Patent Document 1). The cage assembly includes a first annular portion, a second annular portion, a plurality of pillar portions, and a plurality of leaf springs, and each of the pillar portions is connected between the first annular portion and the second annular portion. Yes. In addition, the plurality of column portions are located at intervals in the circumferential direction.

  The leaf springs are present in the same number as the column portions. Each said leaf | plate spring is being fixed to the side surface of the one side of the circumferential direction of a pillar part. A pocket for accommodating the engaging roller is formed between the column portions adjacent in the circumferential direction. Each said leaf | plate spring is urging | biasing the engaging roller accommodated in the said pocket to the one side of the circumferential direction.

  Since the cage assembly is configured to fix the leaf spring to the column portion of the cage, it has an advantage that the diameter of the cage can be suppressed.

  However, in the cage assembly, since the urging member fixed to the column portion is a leaf spring, the pressing force that presses the engaging roller greatly fluctuates due to the change in the position of the engaging roller. As a result, the lock operating angle increases and the free torque varies greatly. These problems also exist in the case where the urging member is a compression coil spring having a structure that can be locked to the pillar portion of the cage.

JP 2001-50296 A

  Therefore, an object of the present invention is to provide a cage assembly and a one-way clutch that are compact and can suppress variations in free torque.

In order to solve the above problems, a cage assembly according to the present invention includes:
An annular portion and a plurality of pillar portions that protrude from the annular portion and are spaced apart from each other in the circumferential direction, have a pocket between the pillar portions adjacent in the circumferential direction, and A cage having a biasing member mounting portion on an outer side or an inner side of at least one of the annular portion and the column portion;
A spiral portion that is attached to the biasing member attachment portion and spirally wound with a wire, a first extension portion that extends outward in the radial direction of the spiral portion from one end of the spiral portion, and the spiral A biasing member having a second extending portion extending radially outward of the spiral portion from the other end of the portion,
The biasing member mounting portion of the retainer includes a first extension portion locking portion that locks the first extension portion, and the first extension portion is associated with the first extension portion. It is designed to be locked to the stop,
The second extension projects into the pocket of the cage ;
The biasing member mounting portion includes a protruding portion that protrudes in a substantially radial direction from an outer surface or an inner surface of the cage,
The projecting portion is located inside the spiral portion .

  According to the present invention, since the urging member is attached to at least one of the annular portion and the column portion of the cage, no member other than the annular portion and the column portion is required to fix the urging member. Therefore, compared with the cage assembly using a leaf spring or a compression coil spring, the size can be made comparable (including any of small, the same, and slightly larger), and the size does not become excessively large.

  Further, according to the present invention, the urging member includes a spiral portion in which the wire is spirally wound, a first extension portion extending from one end of the spiral portion, and a second extension extending from the other end of the spiral portion. Since it is a structure which has an extension part, and is a structure which urges an engagement child using the torsional force of a wire, compared with the case where a leaf spring or a compression coil spring is used, the position of the engagement member Fluctuation of the urging force when the urging member due to the urging of the engaging element is reduced. Because the biasing member uses the torsional force of the wire, and the fluctuation of the biasing force based on the circumferential position of the spiral portion at the starting point of the extension of the second extending portion that contacts the engagement element is small. is there. Therefore, fluctuations in the lock operating angle can be suppressed and variations in free torque can be suppressed. Here, the free torque is a rotational torque when the one-way clutch or the shaft is rotated in the free direction, and is generated by a frictional resistance between the roller and the shaft. Since the frictional resistance is influenced by the force pressing the roller against the shaft, the variation in the free torque can be suppressed by suppressing the fluctuation of the pressing force (biasing force).

Moreover, according to this invention , a helical part can be latched by the said projection part, and a helical part can be positioned with respect to a holder | retainer. Therefore, fluctuations in the lock operating angle can be further suppressed, and variations in free torque can be further suppressed.

The one-way clutch of the present invention is
An outer ring having an inner peripheral engagement surface;
An inner ring having an outer peripheral engagement surface;
A cage assembly of the present invention;
Between the inner peripheral engagement surface of the outer ring and the outer peripheral engagement surface of the inner ring, it is arranged in a state of being accommodated in the pocket of the cage assembly, and is urged in one direction by the urging member. An engagement element is provided.

The one-way clutch of the present invention is
An outer ring having an inner peripheral engagement surface;
A cage assembly of the present invention;
Between the inner peripheral engagement surface of the outer ring and the outer peripheral engagement surface of the shaft member, it is disposed in a state of being accommodated in the pocket of the cage assembly, and is urged in one direction by the urging member. An engagement element is provided.

  According to the two one-way clutches, since the cage assembly of the present invention is provided, the size can be made comparable to that of the one-way clutch using a leaf spring or a compression coil spring as a biasing member. The size does not become excessively large.

  Further, according to the two one-way clutch, since the cage assembly of the present invention is provided, fluctuations in the urging force by which the urging member urges the engagement element can be suppressed, fluctuations in the lock operating angle, Variations in free torque can be suppressed.

  According to the cage assembly of the present invention, since the biasing member is attached to at least one of the annular portion and the column portion of the cage, a member other than the annular portion and the column portion is required to fix the biasing member. And not. Therefore, compared with the cage assembly using a leaf spring or a compression coil spring, the size can be made comparable and the size does not become excessively large.

  Further, according to the cage assembly of the present invention, the urging member includes a spiral portion in which a wire is wound spirally, a first extension portion that extends from one end of the spiral portion, and an extension from the other end of the spiral portion. Since it is the structure which has the 2nd extension part which exists, and is a structure which urges | engages an engaging element using the torsional force of a wire, when a leaf | plate spring and a compression coil spring urge | bias an engaging element Compared with the fluctuation | variation of urging | biasing force, the fluctuation | variation of the urging | biasing force at the time of an urging | biasing member energizing an engagement element becomes small. Therefore, fluctuations in the lock operating angle can be suppressed and variations in free torque can be suppressed.

It is a one part perspective view of the retainer assembly of one embodiment of the present invention. It is a figure explaining the fluctuation | variation of urging | biasing force being small with the said holder | retainer assembly. It is a figure which shows the relationship between the torsion angle of the torsion spring of the said holder | retainer assembly, and a spring force. It is a one part perspective view of the retainer assembly of a modification. It is a schematic cross section of the axial direction of the one way clutch of one Embodiment of this invention.

  Hereinafter, the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a perspective view of a portion of a cage assembly according to an embodiment of the present invention.

  This cage assembly includes a cage 1 and a torsion spring 2 as an urging member. The cage 1 is made of resin and is formed by injection molding. The cage 1 includes a first annular portion 10, a second annular portion 11, and a plurality of pillar portions 12. Each of the column parts 12 connects the first annular part 10 and the second annular part 11. The plurality of column parts 12 are arranged at intervals in the circumferential direction of the first annular part 10.

  The second annular portion 11 has a plurality of concave portions 13, and each concave portion 13 opens outward in the radial direction. Each said recessed part 13 is formed in the position which overlaps with the pillar part 12 in the axial direction in the 2nd annular part 11. FIG. Each said recessed part 13 has a substantially fan shape in the cross section of radial direction. Further, the second annular portion 11 has a plurality of round bar-like projecting portions 17, and each projecting portion 17 projects radially outward from the center portion of the bottom surface 14 of the recess 13.

  Each of the column parts 12 has a recessed part 18, and the recessed part 18 is connected to the recessed part 13 of the second annular part 11. The recess 18 opens outward in the radial direction and outward in the axial direction. The concave portion 18 has a side surface 16 that is inclined with respect to the axial direction. In other words, the presence position of the side surface 16 moves from one side in the circumferential direction to the other side as it goes inward in the axial direction. The side surface 16 extends substantially in the radial direction. The concave portion 18 is open only on the other side in the circumferential direction in the circumferential direction. A pocket 19 for accommodating the engagement element is formed between the column portions 12 adjacent to each other in the circumferential direction. The concave portion 13, the concave portion 18, and the projecting portion 17 constitute an urging member attaching portion. The side surface 16 constitutes a first extending portion locking portion.

  The torsion spring 2 includes a spiral portion 21, a first extension portion 22, and a second extension portion 23. The spiral portion 21 is formed by spirally winding an elastic metal wire. Further, the first extending portion 22 extends substantially straight from one end of the spiral portion 21, while the second extending portion 23 extends substantially straight from the other end of the spiral portion 21. ing. As shown in FIG. 1, the torsion spring 2 is accommodated in a recess composed of a recess 13 and a recess 18. The spiral portion 21 is locked to the protruding portion 17 of the second annular portion 11. In other words, the protruding portion 17 is located inside the spiral portion 21. The first extending portion 22 contacts the side surface 16 of the recess 18 and is locked to the side surface 16. Further, the distal end portion of the second extending portion 23 projects into the pocket 19.

  FIG. 2 is a diagram for explaining that the cage assembly has a small variation in urging force.

  In FIG. 2, reference numeral 33 indicates the center of the metal wire of the torsion spring, reference numerals 36, 37, and 38 indicate the extending direction of the second extending portion 23, and reference numeral 30 indicates the engagement. The reference numeral 31 indicates a position where the second extending portion 23 contacts the engaging roller 30. Reference numeral 40 is a position in the circumferential direction of the second extending portion 23 where the engagement roller 30 is free, and an arrow a indicates a circumferential direction in which the engagement roller 30 is urged. An arrow b indicates an axial direction perpendicular to the circumferential direction a.

  In FIG. 2, the force applied to the engagement roller 30 is a component in the circumferential direction of the force applied to the engagement roller 30 by the second extending portion 23. This circumferential component increases as the extending direction of the second extending portion 23 approaches the axial direction b. Further, the torsion angle (indicated by α in FIG. 2) is the center of the torsion spring when the torsion spring is twisted in the direction of twisting from the circumferential position 40 of the second extending portion 23 to be free (for example, up to 47 parts). When the torsion angle α of the second extending portion 23 reaches about 10 degrees, the circumferential component has a characteristic that the fluctuation is small thereafter.

  FIG. 3 is a diagram objectively illustrating this, and is a diagram illustrating a relationship between the torsion angle of the torsion spring of the cage assembly of the above embodiment and the spring force. In FIG. 3, a straight line P indicates the relationship between the torsion angle of the torsion spring and the load applied by the torsion spring. A broken line K indicates the relationship between the torsion angle of the torsion spring and the load actually applied to the engaging rollers.

  As shown in FIG. 3, the load actually applied to the engaging rollers increases linearly (linearly and proportionally) as the torsion angle increases until the torsion angle reaches about 10 degrees. . In addition, when the torsion angle is larger than 10 degrees, the fluctuation range of the increase due to the increase in the torsion angle becomes extremely small in the load actually applied to the engaging rollers. Therefore, in FIG. 2, the engagement roller 30 is set to the second extension by setting the circumferential position 40 of the second extension 23 when the engagement roller 30 is free to a position where the twist angle is about 10 degrees. Variations in the resultant force of the external force received from the portion 23, the cage, etc. can be greatly suppressed.

  FIG. 4 is a schematic cross-sectional view in the axial direction of a one-way clutch provided with the retainer assembly. FIG. 4 shows a schematic cross-sectional view at a position where it does not pass through the column portion of the cage.

  As shown in FIG. 4, the one-way clutch includes an outer ring 60, a cage assembly 61 according to the above embodiment, and a plurality of engagement rollers 62. The engaging roller 62 is disposed between the inner peripheral engaging surface 80 of the outer ring 60 and the outer peripheral engaging surface 65 of the shaft member 64 in a state of being accommodated in the pocket 19 of the cage assembly 61, and is a torsion spring. 2 (see FIG. 1) is biased in the circumferential direction which is one direction.

  In the above configuration, referring to FIG. 4, when the outer ring 60 rotates relatively to one side in the circumferential direction with respect to the shaft member 64, the engaging roller 62 is connected to the inner peripheral engaging surface 80 of the outer ring 60 and the shaft. The clutch is engaged by being sandwiched between the outer peripheral engagement surface 65 of the member 64. At this time, power is transmitted between the outer ring 60 and the shaft member 64.

  On the other hand, when the outer ring 60 is rotated relative to the other side in the circumferential direction with respect to the shaft member 64, the engaging rollers 62 are connected to the inner peripheral engaging surface 80 of the outer ring 60 and the outer peripheral engaging surface 65 of the shaft member 64. The clutch is disengaged in a loosely engaged state. In this way, transmission of power between the outer ring 60 and the shaft member 64 is cut off.

  According to the cage assembly of the above embodiment, the torsion spring 2 is attached to the second annular portion 11 and the column portion 12 of the cage 1, so that the annular portion 10, No members other than 11 and the column part 12 are required. Therefore, compared with the cage assembly using a leaf spring or a compression coil spring, the size can be made comparable and the size does not become excessively large. Specifically, in the conventional configuration, even if the torsion spring 2 in which the urging member holding member is indispensable outside the outer ring is adopted, the urging member holding member is not necessary, and therefore the size of the one-way clutch is reduced. It will not grow.

  Further, according to the cage assembly of the above embodiment, the torsion spring 2 as the biasing member includes the spiral portion 21 in which the wire is wound spirally, and the first extension portion 22 that extends from one end of the spiral portion 21. And the second extending portion 23 extending from the other end of the spiral portion 21, and the configuration is such that the engaging roller 62 is urged using the torsional force of the wire. Compared with the fluctuation of the urging force when the compression coil spring urges the engaging element, the fluctuation of the urging force when urging the engaging roller 62 is reduced, and the urging force can be easily adjusted. it can. Since the biasing member is the torsion spring 2 and uses the torsional force of the wire, the circumferential position of the spiral portion 21 at the starting point of the extension of the second extension portion 23 that contacts the engaging roller 62 This is because the fluctuation of the biasing force based on the above becomes small. Therefore, fluctuations in the lock operating angle can be suppressed and variations in free torque can be suppressed.

  Further, according to the cage assembly of the above embodiment, the urging member mounting portion includes the protruding portion 17 that protrudes substantially radially from the outer surface of the cage 1, and the protruding portion 17 is positioned inside the spiral portion 21. doing. Accordingly, the spiral portion 21 can be locked by the protrusion 17, and the spiral portion 21 can be positioned with respect to the cage 1. Therefore, fluctuations in the lock operating angle can be further suppressed, and variations in free torque can be further suppressed.

  In addition, according to the one-way clutch of the above-described embodiment, since the cage assembly 61 of the above-described embodiment is provided, the one-way clutch using a leaf spring or a compression coil spring as a biasing member is compared with the size. Can be made comparable, and the size will not be excessively large.

  Further, according to the one-way clutch of the above-described embodiment, since the cage assembly 61 of the above-described embodiment is provided, fluctuations in the urging force that urges the engaging rollers 62 can be suppressed, fluctuations in the lock operating angle, , Variation in free torque can be suppressed.

  In the cage assembly of the above embodiment, the side surface 16 of the recess 18 as a step portion to which the first extension portion 22 is locked extends in the radial direction. The stepped portion where the existing portion is locked may be inclined with respect to the radial direction.

  Further, in the cage assembly of the above embodiment, the protruding portion 17 that forms a part of the biasing member mounting portion has a round bar shape, but in the present invention, the protruding portion that forms a part of the biasing member mounting portion. 17 only needs to protrude in the radial direction, and may be any shape other than a round bar shape such as a prismatic shape.

  Further, in the cage assembly of the above embodiment, the urging member mounting portion is constituted by the concave portion 13 of the second annular portion 11, the concave portion 18 of the column portion 12, and the protruding portion 17 of the second annular portion 11. Then, you may comprise an urging member attaching part only with the recessed part formed in at least one of the cyclic | annular part and the pillar part. This can be realized, for example, by preventing the urging member from detaching from the outer side in the axial direction by providing the cage with a partitioning portion on the outer side in the axial direction of the recess.

  Further, in the cage assembly of the above embodiment, the recesses 13 and 18 are formed on the radially outer side of the cage, and the protrusion 17 projects from the bottom surface 14 of the recess 13 to the radially outer side. However, in this invention, the urging member mounting portion may be formed on the radially inner side of the cage. For example, the urging member mounting portion may be formed as a concave portion that is formed in at least one of the annular portion and the column portion and that opens to the inner side in the radial direction. Further, the urging member mounting portion may be constituted by a concave portion opening inward in the radial direction and a protruding portion protruding inward in the radial direction from the bottom surface of the concave portion.

  In the cage assembly of the above embodiment, the spiral portion 21 is disposed at a position straddling the second annular portion 11 and the column portion 12, and the spiral portion 21 has a diameter on both the second annular portion 11 and the column portion 12. It overlapped in the direction. However, according to the present invention, as shown in FIG. 5, that is, a perspective view of a modified cage assembly, the spiral portion 121 overlaps only the second annular portion 111 in the radial direction and overlaps the column portion 112 in the radial direction. It does not have to be. In the present invention, the spiral portion does not need to overlap only the column portion in the radial direction and overlap the annular portion in the radial direction.

  Further, in the cage assembly of the above embodiment, the urging member mounting portion extends over the second annular portion 11 and the column portion 12, but in this invention, the urging member mounting portion is formed only on the annular portion. Alternatively, it may be formed only on the pillar portion.

  In the above embodiment, the one-way clutch has no inner ring, and the outer peripheral engagement surface 65 exists on the outer peripheral surface of the shaft member 64. However, in the present invention, the one-way clutch is synchronized with the shaft member. A configuration in which a rotating inner ring is provided and an outer peripheral engagement surface exists on the outer peripheral surface of the inner ring may be employed.

  In the above embodiment, the one-way clutch engagement element is the engagement roller 62. However, the one-way clutch engagement element of the present invention may be an engagement element other than the engagement roller, such as a sprag. .

DESCRIPTION OF SYMBOLS 1 Cage 2 Torsion spring 10 1st annular part 11,111 2nd annular part 12 Column part 19 Pocket 13 Recessed part of 2nd annular part 16 Side surface of recessed part of pillar part 17 Projection part 18 Recessed part of column part 21 Spiral part 22 Second part 1 Extension part 23 2nd extension part 60 Outer ring 61 Cage assembly 62 Engagement roller 64 Shaft member 65 Outer peripheral engagement surface 80 Inner peripheral engagement surface

Claims (3)

An annular portion and a plurality of pillar portions that protrude from the annular portion and are spaced apart from each other in the circumferential direction, have a pocket between the pillar portions adjacent in the circumferential direction, and A cage having a biasing member mounting portion on an outer side or an inner side of at least one of the annular portion and the column portion;
A spiral portion that is attached to the biasing member attachment portion and spirally wound with a wire, a first extension portion that extends outward in the radial direction of the spiral portion from one end of the spiral portion, and the spiral A biasing member having a second extending portion extending radially outward of the spiral portion from the other end of the portion,
The biasing member mounting portion of the retainer includes a first extension portion locking portion that locks the first extension portion, and the first extension portion is associated with the first extension portion. It is designed to be locked to the stop,
The second extension projects into the pocket of the cage ;
The biasing member mounting portion includes a protruding portion that protrudes in a substantially radial direction from an outer surface or an inner surface of the cage,
The retainer assembly is characterized in that the protruding portion is located inside the spiral portion . An outer ring having an inner peripheral engagement surface;
An inner ring having an outer peripheral engagement surface;
A cage assembly according to claim 1 ;
Between the inner peripheral engagement surface of the outer ring and the outer peripheral engagement surface of the inner ring, it is arranged in a state of being accommodated in the pocket of the cage assembly, and is urged in one direction by the urging member. A one-way clutch comprising an engagement element. An outer ring having an inner peripheral engagement surface;
A cage assembly according to claim 1 ;
Between the inner peripheral engagement surface of the outer ring and the outer peripheral engagement surface of the shaft member, it is disposed in a state of being accommodated in the pocket of the cage assembly, and is urged in one direction by the urging member. A one-way clutch comprising an engagement element.

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