JP2007132366A - Direct acting one-way clutch - Google Patents

Abstract

An object of the present invention is to provide a linear motion one-way clutch capable of improving the biting characteristics of an engagement element and preventing the engagement element from being blown off when a rod is locked.
A cage is assembled in a wedge-shaped space 5 formed between a conical surface 3 formed on the inner periphery of a housing 1 and a cylindrical outer surface of a rod 4, and a pocket formed in the cage 6 is provided. The engagement element 8 is assembled into the inside 7. The retainer 6 is urged by the elastic member 13 in a direction in which the engagement element 8 is engaged with the narrow portion of the wedge-shaped space 5. Circumferential grooves 14 are formed on the outer periphery of the rod 4 at equal intervals in the axial direction, and the engaging element 8 is drawn into the narrow portion of the wedge-shaped space 5 by the circumferential groove 14 when the rod 4 moves in the locking direction. Improves the biting characteristics of the engagement element and prevents popping.
[Selection] Figure 1

Description

  The present invention relates to a linear motion one-way clutch in which a rod movable in the axial direction can be locked in one direction.

  As this type of linear motion one-way clutch, one described in Patent Document 1 has been conventionally known. In this linear motion one-way clutch, a cylindrical inner surface is provided with a conical inner surface, and a plurality of engagement elements are incorporated at equal intervals in the circumferential direction between the inner surface of the cone and the cylindrical surface of the shaft inserted into the main body. The engaging element is pressed by a spring and urged toward the direction of engagement with the inner surface of the cone and the cylindrical surface of the shaft, and the shaft is locked in one direction by the engagement of the engagement element with the inner surface of the cone and the cylindrical surface. Like to do.

In addition, a cap is opposed to the end face of the main body, a solenoid is provided on the outer peripheral portion of the main body, a magnetic attraction is applied to the cap by energizing the solenoid, and the cap is moved toward the end face of the main body, and the cap is provided. The cylindrical body portion presses the engaging element in the axial direction to release the engagement of the engaging element.
JP 51-114553 A

  By the way, in the above-mentioned conventional linear motion one-way clutch, the engagement member urges the engagement member toward the standby position where the engagement member contacts the conical inner surface and the cylindrical surface by the spring. When the speed is increased, the engaging element is pushed out toward the wide portion of the wedge-shaped space formed by the conical inner surface and the cylindrical surface, and there is a possibility that a phenomenon that the shaft is not locked (popping) may occur.

  An object of the present invention is to provide a linear motion one-way clutch capable of improving the biting characteristics of an engagement element and preventing occurrence of popping.

  In order to solve the above-mentioned problems, in the present invention, a rod is inserted into the housing, a conical surface inclined in the axial direction is formed on the inner periphery of the housing, and formed between the conical surface and the outer periphery of the rod. A cage is assembled in the wedge-shaped space, and an engagement element is assembled in a plurality of pockets formed at intervals in the circumferential direction of the cage, and each engagement element is directed in a direction in which it engages with a narrow portion of the wedge-shaped space. In the linear motion one-way clutch provided with an elastic member that urges the cage in the axial direction, a configuration is adopted in which circumferential grooves are provided at equal intervals in the outer peripheral axis direction of the rod.

  Here, the circumferential groove may be a groove having a rectangular cross section, or may be a groove having a sawtooth cross section. Further, it may have a groove shape with a V-shaped cross section.

  As described above, according to the present invention, the circumferential grooves are provided at equal intervals in the direction of the outer circumferential axis of the rod, so that when the rod moves in the lock direction, the engagement element is narrowed in the wedge-shaped space by contact with the groove. It becomes easy to be pulled in to the part, and the biting characteristic of the engagement element can be improved. For this reason, it is possible to prevent popping from occurring when the rod is locked, and to lock the rod reliably.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIGS. 1 and 2, the housing 1 that is fixedly arranged has a cylindrical shape, one end of which is provided with an end wall 2, and the other end is open. A conical surface 3 having a small diameter end on the end wall 2 side is formed on the inner periphery of the housing 1.

  The rod 4 inserted inside the housing 1 is movable in the axial direction through the end wall 2 and is held in a wedge-shaped space 5 formed between the outer periphery thereof and the conical surface 3 of the housing 1. 6 is incorporated.

  A plurality of pockets 7 are formed in the retainer 6 at equal intervals in the circumferential direction, and an engagement element 8 is incorporated in each pocket 7. Here, a ball is employed as the engagement element 8.

  As shown in FIG. 3, an engagement groove 9 is formed on the inner periphery of the opening end of the housing 1, and is assembled into the opening end of the housing 1 by a retaining ring 10 that is detachably attached to the engagement groove 9. The annular spring seat 11 is retained.

  A plurality of spring accommodating holes 12 are provided at equal intervals in the circumferential direction on the end surface of the cage 6 facing the spring seat 11, and the end of the elastic member 13 partially accommodated in each spring accommodating hole 12 is the above-described spring. It is supported by the seat 11.

  A coil spring is employed as the elastic member 13. The elastic member 13 urges the retainer 6 in a direction in which the engaging element 8 is engaged with the narrow portion of the wedge-shaped space 5. The number of built-in elastic members 13 can be adjusted by removing the retaining ring 10 and the spring seat 11.

  As shown in FIGS. 1 and 3, a large number of circumferential grooves 14 are formed at equal intervals in the rod axis direction on the outer periphery of the rod 4. The circumferential groove 14 has a rectangular cross section. Further, the groove depth of the circumferential groove 14 is shallow, and the rod 4 moves in the rod releasing direction indicated by the arrow in FIG. 1 in a state where the retainer 6 is prevented from moving toward the opening end side of the housing 1 by the spring seat 11. At this time, the engaging element 8 is pushed out of the wedge-shaped space 5 so that the movement of the rod 4 is not hindered.

  The linear motion one-way clutch shown in the embodiment has the above-described structure. FIGS. 1 and 3 show that the engaging member 8 is pushed into the narrow portion of the wedge-shaped space 5 by the pressing of the elastic member 13 and the conical surface 3 and the circumferential direction. The state which exists in the standby position which press-contacts to the bottom face of the groove | channel 14 is shown.

  When the rod 8 is subjected to an axial load in the direction indicated by the arrow in FIG. 1 in the standby state, the cage 6 moves toward the spring seat 11 against the elasticity of the elastic member 13. The engagement element 8 is disengaged from the outer peripheral surface of the rod 4 and the conical surface 3 of the housing 1, and the rod 4 moves in the direction indicated by the arrow.

  On the other hand, when an axial load in the opposite direction (locking direction) to the direction indicated by the arrow in FIG. 1 is applied to the rod 4, the engaging element 8 is pushed into the narrow portion of the wedge-shaped space 5 and the conical surface 3 and the rod 4 is engaged with the outer peripheral surface. The engagement locks the rod 4 and prevents it from moving in one direction (the direction opposite to the direction indicated by the arrow in FIG. 1).

  Here, when the moving speed of the rod 4 in the lock direction is relatively low, there is no popping that the engaging element 8 is blown off by the wide portion of the wedge-shaped space 5, but the moving speed of the rod 4 is high. Then, popping may occur.

  At this time, since the circumferential groove 14 is formed on the outer peripheral surface of the rod 4, when the rod 4 moves in the locking direction at a high speed, a pair of side surfaces 14 a and 14 b orthogonal to the rod axial direction of the circumferential groove 14. Among these, the side surface 14 a on the unlocking direction side is caught by the engaging element 8 and acts to draw the engaging element 8 into the narrow portion of the wedge-shaped space 5, so that the engaging element 8 causes the conical surface 3 and the rod 4 to move. Engage with the outer peripheral surface.

  Once the engaging element 8 is in the engaged state, no popping occurs, and the engaging element 8 is firmly engaged with the conical surface 3 and the outer peripheral surface of the rod 4 as shown in FIG. Locked.

  Thus, by forming the circumferential groove 14 on the outer peripheral surface of the rod 4, the circumferential groove 14 directs the engaging element 8 toward the narrow portion of the wedge-shaped space 5 when the rod 4 moves in the locking direction. Since it acts so as to be pulled in, the biting characteristics of the engagement element 8 can be improved, and the occurrence of popping can be prevented.

  In FIG. 3, the cross-sectional shape of the circumferential groove 14 is rectangular, but the cross-sectional shape of the circumferential groove 14 is not limited to this. For example, as shown in FIG. As shown in FIG.

  The circumferential groove 14 having a sawtooth cross section has a groove shape in which a side surface 14c orthogonal to the axis of the rod 4 is disposed on the unlocking direction side and a tapered bottom surface 14d is disposed on the locking direction side.

  As shown in FIG. 5, when the circumferential groove 14 having a sawtooth cross section is formed on the outer periphery of the rod 4, when the rod 4 moves in the locking direction, the engagement element 8 is wedged by contact with the side surface 14c orthogonal to the axis. It will be drawn into the narrow part of the space 5.

  For this reason, the biting characteristic of the engagement element 8 can be improved, and the occurrence of popping can be prevented.

  Further, as shown in FIG. 6, by forming a circumferential groove 14 having a V-shaped cross section on the outer periphery of the rod 4, the rod 8 moves toward the narrow portion of the wedge-shaped space 5 when the rod 4 moves in the locking direction. In this case, the biting characteristics of the engagement element 8 can be improved and the occurrence of popping can be prevented.

A longitudinal front view showing an embodiment of a linear motion one-way clutch according to the present invention Sectional view along the line II-II in FIG. Sectional drawing which expands and shows the cage assembly part of FIG. Sectional view showing the locked state of the rod Sectional drawing which shows the other example of the circumferential groove | channel Sectional drawing which shows the other example of the circumferential groove | channel

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Housing 3 Conical surface 4 Rod 5 Wedge-like space 6 Cage 7 Pocket 8 Engagement element 13 Elastic member 14 Circumferential groove 14c Side surface 14d Tapered bottom surface

Claims (4)

A rod is inserted into the housing, an axially inclined conical surface is formed on the inner periphery of the housing, and a cage is incorporated in a wedge-shaped space formed between the conical surface and the outer periphery of the rod. An elastic member for urging the retainer in the axial direction toward the direction in which each engagement element engages with a narrow portion of the wedge-shaped space is incorporated in a plurality of pockets formed at intervals in the circumferential direction of In the linear motion one-way clutch provided,
A linear motion one-way clutch characterized in that circumferential grooves are provided at equal intervals in the outer peripheral axis direction of the rod.   The linear motion one-way clutch according to claim 1, wherein the circumferential groove has a rectangular cross section.   The circumferential groove has a serrated cross section, and has a groove shape in which a side surface perpendicular to the axis of the rod is positioned on the unlocking direction side of the rod and a tapered bottom surface is positioned on the locking direction side of the rod. The direct-acting one-way clutch according to 1.   The linear motion one-way clutch according to claim 1, wherein the circumferential groove has a V-shaped cross section.

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