JP4569426B2 - One-way clutch - Google Patents

Description

  The present invention relates to a one-way clutch.

  Conventionally, as a one-way clutch, there is one described in JP-A-10-238560 (Patent Document 1). The one-way clutch includes a clutch casing, an outer ring, a spring member, and a lid member. The clutch casing is a cylindrical member in which an opening at one end in the axial direction is partially covered. The clutch casing has ribs extending in the axial direction on the inner circumferential surface at equal intervals in the circumferential direction, and an annular engaging groove extending in the circumferential direction at the other axial end of the inner circumferential surface. . On the inner circumferential surface of the outer ring, pockets extending from one end to the other end in the axial direction and pockets for accommodating the engaging rollers are formed at equal intervals in the circumferential direction. A recess that extends and engages with the rib is formed. The spring member includes a ring portion and a plurality of spring portions that are continuous with the ring portion and extend in the normal direction of the end surface of the ring portion. The lid member has a disk shape, and an engagement rib that engages with the annular engagement groove is formed on an edge of one end surface.

  The engaging roller is accommodated in the pocket of the outer ring, and the spring member is fitted into the outer ring so that the spring portion is disposed in the pocket, and then the rib of the clutch casing is inserted into the recess of the outer ring. The outer ring is fitted into the clutch casing so as to be engaged. Subsequently, the engagement rib of the lid member is engaged with the engagement groove of the clutch casing, and the other end of the clutch casing is covered with the lid member to form a one-side clutch. The conventional one-way clutch is a lid member, and the other end of the clutch casing is covered to prevent the engaging roller and the spring member from jumping out from the outer ring.

  However, since the conventional one-way clutch requires a lid member to prevent the engaging roller and the spring member from jumping out of the outer ring, the number of parts is increased and the manufacturing cost and material of the one-way clutch are increased. There is a problem that the cost is large. Further, since a step of fitting the lid member into the clutch casing is required, there is a problem that the cycle time required for manufacturing becomes long and the production efficiency is poor.

  In addition, in other conventional one-way clutches, instead of engaging the clutch casing and the lid member, spot welding of the lid member to the clutch casing is performed to prevent the engagement rollers and spring members from coming out of the cage. ing.

However, even in this one-way clutch, a lid member is required to prevent the engaging roller and the spring member from jumping out from the outer ring, so that the number of parts is increased and the manufacturing cost and material cost of the one-way clutch are increased. In addition, since a process of spot welding the lid member to the clutch casing is required, there is a problem that the cycle time required for manufacturing becomes long and the production efficiency is poor.
JP 10-238560 A

  Therefore, an object of the present invention is to provide a one-way clutch having a small number of parts, a low manufacturing cost and a low material cost, and a short cycle time required for manufacturing.

In order to solve the above problems, the one-way clutch of the present invention is
An inner ring having an outer peripheral engagement surface;
An outer ring having an inner peripheral engagement surface;
A first annular part and a second annular part are connected by a pillar part to form a pocket between the opposing pillar parts, and at least two of the above-mentioned incisions leading to the pocket are formed in the first annular part. A cage in which a locking part is formed on the surface facing the pocket of the pillar part;
An engagement member housed in the pocket;
A ring portion disposed on an end surface of the first annular portion on the opposite side of the column portion side, and positioned in the pocket through the notch from the ring portion, and urging the engagement element; And a spring member having an urging portion locked to the locking portion of the pillar portion.

  In this specification, the inner ring is defined as a member having an outer peripheral engagement surface that engages with the engagement element. For example, in the case of a one-way clutch in which the outer peripheral surface of the rotating shaft is used as a cylindrical engaging surface and the outer peripheral surface of the rotating shaft and the engaging element are in contact at the locked position, the rotating shaft is an inner ring.

  According to the present invention, the locking portion is formed on at least two of the pillar portions, and the urging portion is locked to the locking portion. It can be locked to the cage. Therefore, since the spring member does not come out of the cage, the fall prevention member (the lid member in the conventional example) for preventing the spring member from coming out of the cage can be omitted, and the number of parts can be reduced. Thus, material costs can be reduced. Further, since the number of man-hours required for assembly can be reduced, the cycle time required for manufacturing can be shortened, and the production efficiency can be improved.

  In one embodiment of the one-way clutch, the urging portion bends from the ring portion along the pillar portion, and from the tip of the extension portion toward the inside of the pocket. It consists of a bent part and a tip part connected to the bent part, and the extended part is connected to the ring part and has a first plate part having substantially the same first plate width and connected to the first plate part. And a second plate portion having a second plate width larger than the first plate width, and the locking portion is a protrusion protruding from a surface facing the pocket, and the second plate portion A portion of the end surface on the first plate portion side that is not in contact with the first plate portion is locked to the protrusion.

  According to the above embodiment, since the first plate width is smaller than the second plate width, the flexibility in the width direction of the first plate portion is larger than the flexibility in the width direction of the second plate portion. It is possible to increase the flexibility of the extending portion in the width direction. Therefore, at the time of assembling the spring member, the spring member can be easily assembled into the cage, but after the assembly of the spring member, that is, at the end surface of the second plate portion on the first plate portion side. After the portion that is not in contact with the first plate portion is locked to the protrusion, the extending portion does not bend in the width direction, and the spring member does not come out of the cage.

  Moreover, according to the said embodiment, since the 1st board width is smaller than the 2nd board width and the 1st board part is thinner than the 2nd board part, the blade of the metal mold which creates a spring member is provided. Can be thicker. Therefore, the spring member can be easily produced and the life of the mold for producing the spring member can be extended.

  In one embodiment of the one-way clutch, the urging portion bends from the ring portion along the pillar portion, and from the tip of the extension portion toward the inside of the pocket. The engaging portion is a concave portion formed on the surface facing the pocket, and the extending portion protrudes to the surface side facing the pocket. In addition, a convex portion having a shape corresponding to the concave portion is provided, and the convex portion is fitted into the concave portion and locked to the concave portion.

  According to the embodiment, the spring member can be easily and inexpensively locked to the cage.

  In one embodiment of the one-way clutch, the engagement element is a cylindrical roller, and the distal end portion has a portion substantially parallel to the extended portion that is continuous with the distal end portion via the bent portion. Yes.

  According to the above embodiment, the tip portion has a portion substantially parallel to the extending portion that is continuous with the tip portion and the bent portion, so that the tip portion can be prevented from hitting the cylindrical roller. Thus, the cylindrical roller can be prevented from being inclined with respect to the axial direction of the cage. Therefore, it is possible to prevent the cylindrical roller in the loosely fitting position from being violated between the inner and outer rings when the one-way clutch is not transmitting power, and to reduce the fuel consumption of an automobile or the like having this one-way clutch. The roller can be smoothly moved to the engagement position.

  Moreover, the one-way clutch of one embodiment has the bent portion bent in a substantially U shape.

  According to the embodiment, since the bent portion is bent in a substantially U shape, a large deflection margin (displacement margin) can be taken, and the pressing force by which the tip portion presses the engaging element can be obtained. Can be bigger.

  According to the one-way clutch of the present invention, since the locking portion is formed in at least two of the pillar portions, and the urging portion is locked to the locking portion, the spring member Can be locked to the cage. Therefore, it is possible to omit the removal preventing member that prevents the spring member from coming out of the cage, thereby reducing the number of parts and reducing the material cost. Further, since the number of man-hours required for assembly can be reduced, the cycle time required for manufacturing can be shortened, and the production efficiency can be improved.

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

  FIG. 1 is a front view of a one-way clutch according to an embodiment of the present invention.

  The one-way clutch includes a steel inner shaft 1 that is an inner ring, a carbon steel shell 2 that is an outer ring, a cage 3 made of nylon, a spring member 4 made of stainless steel, and an engagement element. Cylindrical rollers (rollers) 5 are provided. As shown in FIG. 1, the inner shaft 1 has a flange and a cylindrical engagement surface as an example of an outer peripheral engagement surface, while the shell 2 is an engagement cam surface as an example of an inner peripheral engagement surface. 8. The cylindrical roller 5 is accommodated in a pocket 7 of the cage. A plurality of the cylindrical rollers 5 are arranged between the cylindrical engagement surface of the inner shaft 1 and the inner peripheral cam surface of the shell 2 with a certain interval in the circumferential direction while being held by the cage 3. Yes. The spring member 4 is fixed to the pillar portion of the cage 3. The spring member 4 biases the cylindrical roller 5 in the pocket 7 in one direction.

  FIG. 2 is an axial sectional view of the one-way clutch. In FIG. 2, reference numeral 21 indicates the first annular portion of the cage 3, and reference numeral 22 indicates the second annular portion of the cage. As shown in FIG. 2, the shell 2 has a flange 25 that is bent radially inward at one end in the axial direction, and a cylindrical body that is straight open without being bent in the axial direction at the other end in the axial direction. It has become. Further, the same number of the engagement cam surfaces 8 as the number of rollers 5 are provided in the intermediate portion in the axial direction of the shell 2.

  FIG. 3 is a perspective view of the cage 3.

  As shown in FIG. 3, the cage 3 includes a first annular portion 21, a second annular portion 22, and a plurality of column portions 31 that connect the first annular portion 21 and the second annular portion 22. . In the adjacent part on one side in the circumferential direction of the part where each column part 31 is connected on the outer peripheral surface of the first annular part 21 (this one side is the same side in all the column parts 31), A notch (groove) 33 extending in the axial direction from the end surface of the annular portion 21 opposite to the column portion 31 side to the pocket 7 is formed. Further, the axially outer end surface of the first annular portion 21 (the end surface opposite to the column portion 31 side of the first annular portion 21) corresponds to the shape of the ring portion of the spring member 4 described in detail later. A recessed portion 34 having a shape to be formed is formed. The column portion 31 extends substantially parallel to the axial direction of the cage 3. Six column parts 31 are arranged at substantially equal intervals in the circumferential direction of the cage 3. Further, the pocket 7 is formed on the edge surface (the surface facing the pocket 7 on the side continuing to the notch 33 in the column portion 31) constituting the pocket 7 on the side continuing to the notch 33 in the column portion 31. Is formed on the inner side (the side of the opposing column part 31 constituting the pocket 7). This protrusion 35 is a locking portion.

  In addition, protrusions 36 are formed on the outer periphery of the first annular portion 21 at the front end side in the assembly direction of the cage 3 at equal circumferential intervals, and on the outer periphery of the second annular portion 22 on the rear end side in the assembly direction. Projections 37 are formed at equal intervals around the circumference. Each of the protrusions 36 and 37 has a substantially semicircular cross section, and engages with a recess (not shown) formed on the inner peripheral surface of the shell 2. By engaging the protrusions 36 and 37 with the recess, the cage 3 is prevented from moving in the circumferential direction with respect to the shell 2.

  FIG. 4 is a perspective view of the spring member 4.

  As shown in FIG. 4, the spring member 4 includes a ring portion 41 and a biasing portion 42. The ring portion 41 has an inner peripheral cylindrical surface. The ring part 41 has a petal shape in which a thin part and a thick part are repeated six times in the circumferential direction. The end surface shape of the ring portion 41 is substantially the same as the end surface shape of the recess 34.

  The urging portion 42 extends from the boundary portion between the thick portion and the thin portion on the end surface of the ring portion 41 and extends in a substantially normal direction of the end surface, and is connected to the extension portion 44. The bent portion 45 bends inside the pocket 7, and the distal end portion 46 connected to the bent portion 45.

  The extending portion 44 is continuous with the ring portion 41, and has a first plate portion 47 having substantially the same first plate width, and a second plate that is continuous with the first plate portion 47 and is larger than the first plate width. It consists of the 2nd board part 48 which has board width. A portion (hereinafter referred to as a non-contact portion) 50 that is not in contact with the first plate portion 47 on the end surface of the second plate portion 48 on the first plate portion 47 side is locked by the locking portion. ing. Each of the bent portions 45 has a substantially U shape, and is not a shape bent at an acute angle but a curved shape. Further, each of the tip portions 46 has a portion substantially parallel to the extending portion 44 that is continuous with the tip portion 46 via the bent portion 54. In other words, at least one of the tangential planes of the distal end portion 46 is parallel to the extending portion 44 that is continuous with the distal end portion 46 via the bent portion 54.

  FIG. 5 is a perspective view of a cage assembly in which the spring member 4 is incorporated in the cage 3.

  The urging portion 42 is inserted into the pocket 7 of the cage 3 so that the urging portion 42 of the spring member 4 passes through the notch 33 of the cage 3, and the non-contact portion 50 is engaged with the protrusion 35 of the cage 3. Stop. In this way, the cage assembly shown in FIG. 5 is formed. In the process of achieving this locking, it is necessary to pass the second plate portion 48 having a plate thickness larger than that of the first plate portion 47 to the side of the protrusion 35. The side of the projection 35 is allowed to pass while being bent in the width direction of the plate portion 48. As shown in FIG. 4, since the plate thickness of the first plate portion 47 is thinner than the plate thickness of the second plate portion 48, the extending portion 44 can be easily bent in the width direction.

  In a state where the spring member 4 is locked to the retainer 3, the protrusion 35 and the non-contact portion 50 are in contact with each other, and the urging portion 42 is in contact with the retainer 3. It cannot move to the 1 annular part 21 side. That is, once the spring member 4 is locked to the cage 3, the spring member 4 is prevented from coming out of the cage 3. Moreover, in this embodiment, the dimension of the said protrusion 35 and the non-contact part 50 is a dimension which the extension part 44 does not bend in the width direction in a latching state.

  After the cylindrical roller 5 is accommodated in the pocket 7 of the cage assembly shown in FIG. 5, the cage assembly in which the cylindrical roller 5 is disposed in the pocket 7 is connected to the protrusions 36 of the first and second annular portions 21, 22. The retainer 3 is press-fitted into the shell 2 from its open end side so that 37 fits into a recess (not shown) provided on the inner periphery of the shell 2. Further, the shell 2 in which the cage 3 is fitted is fitted and fixed to the inner shaft 1 so that the engaging rollers 5 are in contact with the outer peripheral surface of the inner shaft 1, and this embodiment shown in FIGS. Form a one-way clutch.

  In the above configuration, when the shell 2 rotates relative to the inner shaft 1 in the direction of the arrow A in FIG. 1, the cylindrical roller 5 moves in the direction in which the tip end portion 46 extends, and the engagement cam surface of the shell 2. The clutch is engaged by being sandwiched between the (inner peripheral cam surface) 8 and the outer peripheral cylindrical surface of the inner shaft 1. At this time, power is transmitted between the shell 2 and the inner shaft 1.

  On the other hand, when the shell 2 rotates relative to the inner shaft 1 in the direction of arrow B in FIG. 1, the cylindrical roller 5 moves in the direction of compressing the distal end portion 46, and the inner peripheral cam surface 8 of the shell 2 The clutch is disengaged by loosely fitting between the outer peripheral cylindrical surfaces of the inner shaft 1. At this time, transmission of power is interrupted between the shell 2 and the inner shaft 1.

  According to the one-way clutch of the above-described embodiment, the protrusions 35 that are the locking portions are formed on the respective column portions 31 and the non-contact portions 50 that are locked to the protrusions 35 are formed on the urging portions 42. The spring member 4 can be locked to the retainer 3 by locking the non-contact portion 50 to the protrusion 35. Therefore, since the removal preventing member (the cover member in the conventional example) for preventing the spring member 4 from coming out of the cage 3 can be omitted, the number of parts can be reduced and the material cost can be reduced. Further, the number of man-hours required for assembly can be reduced, the cycle time required for manufacturing can be shortened, and the production efficiency can be improved.

  Further, according to the one-way clutch of the above embodiment, the first plate portion is smaller than the second plate width and the first plate portion 47 is thinner than the second plate portion 48. The flexibility in the width direction of 47 can be increased, and the flexibility in the width direction of the extending portion 44 can be increased. Therefore, when the spring member 4 is assembled, the spring member 4 can be easily assembled into the cage 3, while after the assembly of the spring member 4, that is, after the non-contact portion 50 is locked to the protrusion 35, The extending portion 44 does not bend in the width direction, and the spring member 4 does not come out of the cage 3.

  Further, according to the one-way clutch of the above embodiment, the first plate width is smaller than the second plate width, and the first plate portion 47 is thinner than the second plate portion 48. The blade of the mold to be created can be made thicker. Therefore, the spring member 4 can be easily produced and the life of the mold for producing the spring member 4 can be extended.

  Further, according to the one-way clutch of the above-described embodiment, the distal end portion 46 has a portion substantially parallel to the extending portion 44 that is continuous with the distal end portion 46 via the bent portion 45. The cylindrical roller 5 can be prevented from hitting one piece, and the cylindrical roller 5 can be prevented from being inclined with respect to the axial direction of the cage 3. Therefore, it is possible to prevent the cylindrical roller 5 in the loosely-fitted position during the non-power transmission of the one-way clutch from being violated between the inner and outer rings 1 and 2, and to reduce the fuel consumption of an automobile or the like having a one-way clutch. The cylindrical roller 5 can be smoothly moved to the engagement position.

  Further, according to the one-way clutch of the above embodiment, since the bent portion 45 has a substantially U-shaped shape and a curved shape, a large deflection margin (displacement margin) can be taken, The pressing force with which the tip 46 presses the cylindrical roller 5 can be increased.

  In the one-way clutch of the above embodiment, the inner peripheral surface of the shell 2 is the inner peripheral cam surface 8, the outer peripheral surface of the inner shaft 1 is the outer cylindrical surface, and the one-way clutch is a so-called outer surface. In this invention, the inner peripheral surface of the outer ring is an inner cylindrical surface, the outer peripheral surface of the inner ring may be an engaging cam surface, and the one-way clutch is a so-called inner type. It may be a cam type.

  In the one-way clutch of the above-described embodiment, the engagement element is the cylindrical roller (roller) 5. However, in the present invention, the engagement element may be an engagement element other than the cylindrical roller such as a sprag. In the one-way clutch of the above embodiment, the inner ring is the inner shaft 1. However, in the present invention, the inner ring may be an annular member that is externally fitted to the shaft (rotating shaft).

  In the one-way clutch of the above embodiment, the shell 2 and the cage 3 are separate. However, in the present invention, the outer ring and the cage may be integrated, or the outer ring and the cage are integrated. A pocket may be formed on the inner peripheral side of the member.

  Further, in the one-way clutch of the above embodiment, the locking portion is a projection 35 protruding from the column portion 31 and the non-contact portion 50 is locked to the projection 35. The protrusion protruding from the pillar portion of the cage, and the portion locked by the protrusion may be a notch having a rectangular cross section formed at one edge of the extending portion of the spring member. In this case, it is needless to say that the plate width of the plate-like extension portion is substantially the same except for the portion where the notch is formed, unlike the above embodiment.

  In the one-way clutch of the above embodiment, the bent portion 45 has a substantially U-shaped shape and a curved shape, but the bent portion has a substantially L-shaped shape and a curved shape. Not necessarily. Further, in the one-way clutch of the above embodiment, the protrusions 35 that are the locking portions are formed one by one on all the column portions 31, but in the present invention, one locking portion is provided for at least two column portions. It may be formed one by one.

  In the one-way clutch of the above-described embodiment, a notch 33 (groove) extending in the axial direction is formed in one circumferential adjacent portion of the portion where the column portion 31 is connected to the outer peripheral surface of the first annular portion 21. Then, the urging portion 42 is inserted into the pocket 7 through the notch 33, but at one adjacent portion in the circumferential direction of the portion where the column portion on the outer peripheral surface of the first annular portion is connected. Instead of the notch (groove), a through hole may be formed, and the urging portion may be inserted into the pocket through the through hole.

  In the one-way clutch of the above embodiment, the locking portion is the protrusion 35 protruding from the column portion 31 and the non-contact portion 50 is locked to the protrusion 25. The portion is a recess formed in each pillar portion of the cage, and protrudes to the edge side of the pocket (opposite the center side of the pocket) and has a shape corresponding to the shape of the recess ( You may make it latch a part of extension part). When the locking structure is such a structure, the spring member can be locked to the cage simply and inexpensively.

It is a front view of the one way clutch of one embodiment of the present invention. It is sectional drawing of the axial direction of the one-way clutch of one Embodiment of this invention. It is a perspective view of the holder | retainer which the one way clutch of the said embodiment has. It is a perspective view of the spring member which the one way clutch of the above-mentioned embodiment has. FIG. 5 is a perspective view of a cage assembly in which the spring member shown in FIG. 4 is incorporated in the cage shown in FIG. 3.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Inner shaft 2 Shell 3 Cage 4 Spring member 5 Cylindrical roller 7 Pocket 21 1st annular part 22 2nd annular part 31 Column part 35 Projection 41 Ring part 42 Energizing part 44 Extension part 45 Bending part 46 Tip part 47 First 1 plate part 48 2nd plate part

Claims (5)

An inner ring having an outer peripheral engagement surface;
An outer ring having an inner peripheral engagement surface;
A first annular part and a second annular part are connected by a pillar part to form a pocket between the opposing pillar parts, and at least two of the above-mentioned incisions leading to the pocket are formed in the first annular part. A cage in which a locking part is formed on the surface facing the pocket of the pillar part;
An engagement member housed in the pocket;
A ring portion disposed on an end surface of the first annular portion on the opposite side of the column portion side, and positioned in the pocket through the notch from the ring portion, and urging the engagement element; A one-way clutch comprising: a spring member having an urging portion locked to the locking portion of the column portion. The one-way clutch according to claim 1,
The urging portion includes an extending portion extending from the ring portion along the column portion, a bent portion bent from the tip of the extended portion toward the inside of the pocket, and a tip portion connected to the bent portion. And consist of
The extending portion is continuous with the ring portion, and has a first plate portion having substantially the same first plate width, and a second plate width that is continuous with the first plate portion and larger than the first plate width. A second plate part having
The locking portion is a protrusion protruding from the surface facing the pocket,
The one-way clutch, wherein a portion of the end surface of the second plate portion on the first plate portion side that is not in contact with the first plate portion is locked to the protrusion. The one-way clutch according to claim 1,
The urging portion includes an extending portion extending from the ring portion along the column portion, a bent portion bent from the tip of the extended portion toward the inside of the pocket, and a tip portion connected to the bent portion. And consist of
The locking portion is a recess formed on the surface facing the pocket,
The extending portion protrudes toward the surface facing the pocket and has a convex portion having a shape corresponding to the concave portion, and the convex portion is fitted into the concave portion and locked to the concave portion. One-way clutch characterized by The one-way clutch according to claim 2 or 3,
The engagement element is a cylindrical roller,
The one-way clutch characterized in that the tip end portion has a portion substantially parallel to the extension portion connected to the tip end portion via the bent portion. The one-way clutch according to any one of claims 2 to 4,
The one-way clutch, wherein the bent portion is bent in a substantially U shape.

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