JP6764266B2 - Ratchet mechanism - Google Patents

Description

The present invention relates to a ratchet mechanism used as a one-way clutch and a drain valve drive device including the ratchet mechanism.

In a drain valve driving device such as a washing machine, the driving force of the motor unit is driven in the opening direction via a first rotating member such as a gear, a second rotating member such as a gear, a crank member, etc., and the motor unit is driven. When the drive of the drain valve is stopped, the drain valve moves in the closing direction by the urging force of the urging member. Therefore, a technique of providing a ratchet mechanism as a one-way clutch between the first rotating member and the second rotating member, etc., and causing the ratchet mechanism to idle when the drain valve moves in the closing direction by the urging force of the urging member. Has been proposed (see Patent Document 1). In the ratchet mechanism, for example, as shown in FIG. 7, the first rotating member 6x is provided with a peripheral wall 66x surrounding the ratchet member 8x, while a plurality of engaging teeth 63x are provided on the inner peripheral surface of the peripheral wall 66x. Further, on the ratchet member 8x, three engaging claws 80x extend from the circular main body 81x coupled to the second rotating member 7x in the counterclockwise direction of CCW, and the tip portion of the engaging claw 80x. Is engaged with the engaging tooth 63x. Therefore, when the first rotating member 6x rotates clockwise CW about the axis L, such rotation is transmitted to the second rotating member 7x via the ratchet member 8x. On the other hand, when the second rotating member 7x rotates clockwise CW around the axis L, the ratchet member 8x only bends the engaging claw 80x radially inward each time it gets over the engaging tooth 63x. No rotation is transmitted from the second rotating member 7x to the first rotating member 6x.

Japanese Unexamined Patent Publication No. 2011-1980

In the ratchet mechanism 4x shown in FIG. 7, the frictional force when the engaging claw 80x rides on the engaging tooth 63x so that the drain valve is not damaged when the drain valve is moved in the closing direction by the urging force of the urging member. Therefore, it is preferable to apply a braking force to the output shaft. However, in the ratchet mechanism 4x shown in FIG. 7, the frictional force when the engaging claw 80x gets over the engaging tooth 63x is small. On the other hand, if a structure in which the frictional force per engaging claw 80x is increased is adopted, a large stress is applied to the engaging claw 80x, so that the engaging claw 80x is likely to be worn or damaged.

In view of the above problems, the subject of the present invention is a ratchet mechanism capable of suppressing excessive stress applied to the engaging claws even if the braking force utilizing the frictional force of the engaging claws is increased. The purpose is to provide a drain valve drive device.

In order to solve the above problems, the ratchet mechanism according to the present invention has a first rotating member provided with a plurality of engaging teeth on the inner peripheral surface of the peripheral wall surrounding the rotation center axis, and a first rotating member coaxial with the first rotating member. The ratchet member has an arranged ratchet member, and the ratchet member extends from the main body portion and the root portion connected to the main body portion to one side around the rotation center axis, and has a tip portion inside the peripheral wall. A plurality of engaging claws abutting on the engaging teeth are provided, and each of the plurality of engaging claws is provided with a gap at the root portion of the engaging claws adjacent to each other on one side around the rotation center axis. It has overlapping portions that overlap on the outer side in the radial direction, and the engaging claws extend in an arc shape centered on a position separated from the rotation center axis .

In the present invention, when the first rotating member rotates to the other side around the rotation center axis, the tip side of the engaging claw of the ratchet member is in contact with the engaging teeth of the first rotating member, so that the first rotating member The rotation is transmitted to the ratchet member, and the ratchet member rotates. On the other hand, when the ratchet member rotates to the other side around the rotation center axis, the ratchet member changes from the ratchet member to the first rotating member by simply bending the engaging claw inward each time the ratchet member gets over the engaging claw. The rotation is not transmitted. At that time, the ratchet mechanism functions as a one-way clutch, and a load is applied to the ratchet member by the frictional force when the engaging claw rides on the engaging tooth, so that the rotation speed of the ratchet member decreases. Here, the distance between the engaging claws is such that each of the plurality of engaging claws has an overlapping portion that overlaps radially outward through a gap at the root portion of the engaging claws adjacent to each other on one side around the center axis of rotation. Since it is set narrow, the number of engaging claws can be increased. Therefore, since the stress applied to one engaging claw can be reduced, the engaging claw is less likely to be worn or damaged. Therefore, the durability of the ratchet mechanism can be improved. The above-mentioned action and effect are the same even when the ratchet mechanism is used as a one-way clutch that transmits the rotation of the ratchet member to the first rotating member. Further, according to this aspect, when the engaging claw is bent, the engaging claw is unlikely to come into contact with the root portion of the engaging claw located on one side around the rotation center axis.

In the present invention, an embodiment is adopted in which the ratchet member has a second rotating member coaxially arranged with the first rotating member, and the ratchet member has a connecting portion with the second rotating member in the main body portion. can do.

In the present invention, the engagement claw can adopt a manner extending from the root portion to one side around the rotation center axis. According to such an embodiment, without expanding the outer diameter of the ratchet member, each of the plurality of engaging claws is radially outward through a gap at the root portion of the engaging claws adjacent to each other on one side around the rotation center axis. The distance between the engaging claws can be narrowed until the overlapping portion is provided. Therefore, it is suitable for increasing the number of engaging claws.

In the present invention, it is possible to adopt an embodiment in which four, five or six engaging claws are provided.

In the present invention, it is possible to adopt an embodiment in which the circumferential dimension of the root portion is larger than the radial dimension of the portion of the engaging claw located on the tip side of the root portion. According to this aspect, the strength of the base portion of the engaging claw can be increased, and the engaging claw can be easily bent.

In the present invention, when the first rotating member rotates to the other side around the rotation center axis, the tip side of the engaging claw of the ratchet member is in contact with the engaging teeth of the first rotating member, so that the first rotating member The rotation is transmitted to the ratchet member, and the ratchet member rotates. On the other hand, when the ratchet member rotates to the other side around the rotation center axis, the ratchet member changes from the ratchet member to the first rotating member by simply bending the engaging claw inward each time the ratchet member gets over the engaging claw. The rotation is not transmitted. At that time, the ratchet mechanism functions as a one-way clutch, and a load is applied to the ratchet member by the frictional force when the engaging claw rides on the engaging tooth, so that the rotation speed of the ratchet member decreases. Here, the distance between the engaging claws is such that each of the plurality of engaging claws has an overlapping portion that overlaps radially outward through a gap at the root portion of the engaging claws adjacent to each other on one side around the center axis of rotation. Since it is set narrow, the number of engaging claws can be increased. Therefore, since the stress applied to one engaging claw can be reduced, the engaging claw is less likely to be worn or damaged. Therefore, the durability of the ratchet mechanism can be improved.

It is a perspective view which shows the appearance of the drain valve drive device to which this invention is applied. It is an exploded perspective view of the drain valve drive device to which this invention is applied. It is a perspective view which saw the ratchet mechanism to which this invention was applied from one side in the axial direction. It is explanatory drawing which shows the whole of the ratchet mechanism to which this invention is applied. It is explanatory drawing of the ratchet member of the ratchet mechanism to which this invention is applied. It is a graph which shows the durability test result of the ratchet mechanism to which this invention was applied. It is explanatory drawing of the ratchet mechanism which concerns on the reference example of this invention.

A drive device provided with a ratchet mechanism to which the present invention is applied will be described with reference to the drawings. In the following description, an example in which the drive device is configured as a drain valve drive device for driving the drain valve as a driven member in the open direction and the closed direction will be mainly described. In the following description, one side around the rotation center axis of the present invention corresponds to a counterclockwise CCW around the axis L, and the other side around the rotation center axis corresponds to a clockwise CW around the axis L. ..

(overall structure)
FIG. 1 is a perspective view showing the appearance of the drain valve drive device 100 to which the present invention is applied. FIG. 2 is an exploded perspective view of the drain valve drive device 100 to which the present invention is applied.

In FIGS. 1 and 2, the drain valve drive device 100 to which the present invention is applied includes a case body 30 including a lower case 31 and an upper case 32, and a crank member 10 projects from an opening 320 formed in the upper case 32. ing. A support plate 33 is arranged between the lower case 31 and the upper case 32. A motor unit 1a as a drive source is arranged in the lower case 31, and the rotational force of the motor unit 1a is transmitted to the crank member 10 via the train wheel 2. In the train wheel 2, the first gear 21, the second gear 22, the third gear 23, the fourth gear 24, and the fifth gear 25 are arranged in this order from a pinion (not shown) attached to the rotating shaft 1b of the motor unit 1a. The fifth gear 25 is connected to the crank member 10 by a screw 29.

The crank member 10 includes a cylindrical body portion 17, a disk portion 18 provided on the upper end side thereof, and a rod engaging tooth 19 protruding upward from the outer circumference of the disk portion 18. The rod engaging tooth 19 is located at a position deviated from the rotation center axis of the crank member 10, and the rod 20 is engaged as shown by the alternate long and short dash line in FIG. The cylindrical body portion 17 is provided with a cam portion 16 on the outer peripheral surface on the lower end side. The cam portion 16 is in a state where the movable contact piece 51 of the switch 5 shown in FIG. 2 is in contact with the cam portion 16, and the switch 5 is turned on or off by rotating the crank member 10. Such a switch 5 is used to detect the rotational position of the crank member 10.

In the drain valve drive device 100, the crank member 10 receives the rotation of the fifth gear 25 and rotates around the axis L10 to linearly reciprocate the rod 20 engaged with the rod engaging teeth 19. Let me. A valve mechanism (not shown) exists on the other end side of the rod 20, and the drain valve 110 is opened and closed by the linear reciprocating motion of the rod 20.

The drain valve 110 is constantly subjected to an urging force (indicated by an arrow F in FIG. 1) for returning to the fully closed state by an urging member (not shown). When the drain valve 110 is opened, the rod 20 pulls the drain valve 110 against the force of returning to the fully closed state, and the drain valve 110 operates in the direction of arrow X1 in FIG. On the contrary, when the drain valve 110 in the fully open state is brought into the fully closed state, the rod 20 operates in the direction of arrow X2 in FIG. 1 by receiving an urging force for returning to the fully closed state.

In the drain valve drive device 100 configured in this way, the second gear 22 shown in FIG. 2 is configured with a ratchet mechanism 4 described later with reference to FIGS. 3, 4 and 5.

(Structure of ratchet mechanism)
FIG. 3 is a perspective view of the ratchet mechanism 4 to which the present invention is applied as viewed from one side in the L direction of the axis, and FIGS. 3 (a) and 3 (b) are a perspective view of the entire ratchet mechanism 4 and the ratchet mechanism 4. It is an exploded perspective view. FIG. 4 is an explanatory view showing the whole of the ratchet mechanism 4 to which the present invention is applied, and FIGS. 4A and 4B are a plan view and a side view of the ratchet mechanism 4. 5A and 5B are explanatory views of the ratchet member 8 of the ratchet mechanism 4 to which the present invention is applied, and FIGS. 5A and 5B are a plan view of the ratchet member 8 and a partial cross section shown by cutting out a part thereof. It is a figure.

As shown in FIGS. 3, 4 and 5, the ratchet mechanism 4 has a first rotating member 6 that can rotate around the axis L (rotation center axis) of the support shaft 41 and a first rotating member 6 coaxially with the first rotating member 6. It has a ratchet member 8 provided. Further, the ratchet mechanism 4 has a first rotating member 6 and a second rotating member 7 arranged coaxially with the ratchet member 8, and the ratchet member 8 and the second rotating member 7 rotate integrally.

The first rotating member 6 includes a disk portion 65 having a gear 61 formed on the outer peripheral portion, a cylindrical peripheral wall 66 protruding from the disk portion 65 on one side L1 in the axis L direction, and an axis line from the disk portion 65. It is provided with a cylindrical portion 67 projecting to L2 on the other side in the L direction. The disc portion 65, the peripheral wall 66, and the cylindrical portion 67 are coaxial, and the cylindrical portion 67 is opened as a circular hole 69 at the center of the disc portion 65.

On the inner peripheral surface of the peripheral wall 66, a plurality of engaging teeth 63 having a triangular tooth shape in the circumferential direction are formed at equal angular intervals. Each of the plurality of engaging teeth 63 has a first slope 631 provided on the side of the clockwise CW from the top 630 and a second slope 632 provided on the side of the counterclockwise CCW from the top 630. .. The inclination of the second slope 632 is gentler than the inclination of the first slope 631, and the inclination of the first slope 631 is steep.

The second rotating member 7 includes a body portion 75 having a gear 71 formed on the outer peripheral portion, a first shaft portion 76 projecting from the center of the body portion 75 to one side L1 in the axis L direction, and an axis line L from the body portion 75. A second shaft portion 77 projecting to the other side L2 in the direction is provided, and the body portion 75, the first shaft portion 76, and the second shaft portion 77 are coaxial. The second rotating member 7 is formed with a shaft hole 72 that penetrates the first shaft portion 76, the body portion 75, and the second shaft portion 77 in the axis L direction, and a support shaft 41 is fitted in the shaft hole 72. .. Therefore, the second rotating member 7 is rotatably supported around the axis L by the support shaft 41.

Further, the first rotating member 6 is rotatably supported around the axis L by the first shaft portion 76 by fitting the cylindrical portion 67 into the first rotating member 7 with the first shaft portion 76. In this state, the first shaft portion 76 projects from the disc portion 65 of the second rotating member 6 to one side L1 in the axis L direction.

(Structure of ratchet member 8)
A ratchet member 8 is provided inside the peripheral wall 66 of the first rotating member 6 on the side opposite to the second rotating member 7 with respect to the first rotating member 6. The ratchet member 8 is made of resin. The ratchet member 8 has a disk-shaped main body 81 that is connected to the second rotating member 7, and a plurality of engaging claws 80 that extend counterclockwise in the CCW direction from the root portion 801 connected to the main body 81. The tip portions 802 of the plurality of engaging claws 80 are in contact with the engaging teeth 63 from the clockwise CW side. In the main body 81, an annular rib 811 is formed on the end surface 810 of one side L1 in the axis L direction. In the present embodiment, the engaging claws 80 are formed at equal angular intervals about the axis L. In this embodiment, four engaging claws 80 are formed at equal intervals of 90 ° about the axis L.

The second rotating member 7 and the main body 81 of the ratchet member 8 are connected via the first shaft portion 76 of the second rotating member 7 that penetrates the cylindrical portion 67 of the first rotating member 6. More specifically, in the ratchet member 8, an elongated hole 818 as a connecting portion with the second rotating member 7 is formed in the center of the main body portion 81, while the first shaft portion of the second rotating member 7 is formed. The end portion 760 of one side L1 in the axis L direction of 76 has an oval cross section that fits into the slotted hole 818.

As shown in FIG. 5A, in the ratchet member 8, each of the plurality of engaging claws 80 is radially outside through a gap G at the root portion 801 of the engaging claws 80 adjacent to each other on the counterclockwise CCW side. It has an overlapping portion 803 that overlaps with. More specifically, when a virtual straight line La or Lb connecting the axis L and the end portion in the circumferential direction of the root portion 801 is drawn, the portion of the engaging claw 80 located between the straight lines La and Lb is located. , The overlapping portion 803 that overlaps the root portion 801 on the outer side in the radial direction via the gap G.

Here, the engaging claw 80 extends from root portion 801 to the side of the counter-clockwise CCW about the axis L.

Further, the engaging claw 80 extends in an arc shape centered on a position separated from the axis L, and the curvature of the engaging claw 80 is constant in the extending direction of the engaging claw 80. Further, in the engaging claw 80, the radial dimension Wb from the root portion 801 to the vicinity of the tip portion 802 is constant. Therefore, the inner peripheral end surface 806 of the engaging claw 80 is centered on a position separated from the axis L. It extends in an arc shape having a constant radius of curvature in O, and the curvature of the inner peripheral end surface 806 is constant in the extending direction of the inner peripheral end surface 806. Further, the outer peripheral end surface 807 of the engaging claw 80 also extends in an arc shape having a constant radius of curvature around the center O at a position separated from the axis L, and the curvature of the outer peripheral end surface 807 is in the extending direction of the outer peripheral end surface 807. It is constant. Further, in the engaging claw 80, the circumferential dimension Wa of the root portion 801 is larger than the radial dimension Wb of the portion located on the tip side of the root portion 801 of the engaging claw 80.

(motion)
In the drain valve drive device 100 configured as described above, in the ratchet mechanism 4, when the first rotating member 6 rotates clockwise CW by the rotational driving force transmitted from the motor unit 1a, the first rotating member 6 is engaged. Since the teeth 63 and the engaging claw 80 of the ratchet member 8 engage with each other, the rotation of the clockwise CW of the first rotating member 6 is transmitted to the second rotating member 7 via the ratchet member 8. Such rotation is transmitted from the third gear 23 to the crank member 10 shown in FIG. 1 via the fourth gear 24 and the fifth gear 25, and when the crank member 10 rotates to one side R10 around the axis L10, the rod 20 The drain valve 110 is driven in the opening direction via.

On the other hand, when the rotation of the motor portion 1a is stopped, the crank member 10 is rotated to one side R10 around the axis L10 by the urging force in the closing direction applied to the drain valve 110, and the rotation is the fifth gear 25. , Is transmitted to the second rotating member 7 via the fourth gear 24 and the third gear 23. However, the rotation direction of the second rotating member 7 at that time is clockwise CW (the other side), and the first
This is the direction in which the engaging teeth 63 of the rotating member 6 and the engaging claws 80 of the ratchet member 8 are disengaged. Therefore, the ratchet member 8 and the second rotating member 7 rotate clockwise CW (the other side), but the engaging claw 80 bends so as to get over the engaging tooth 63, so that the first rotating member 6 rotates. do not do. Therefore, the movement of the drain valve in the closing direction is not hindered.

Further, in the ratchet mechanism 4, the braking force is applied to the second rotating member 7 by the frictional force when the engaging claw 80 rides on the engaging tooth 63, so that the braking force is applied to the drain valve 110. Therefore, the drain valve 110 is less likely to be damaged.

(Main effect of this form)
As described above, the ratchet mechanism 4 of the present embodiment functions as a one-way clutch and generates a braking force by the frictional force when the engaging claw 80 rides on the engaging tooth 63. Here, each of the plurality of engaging claws 80 has an overlapping portion 803 that overlaps the root portion 801 of the adjacent engaging claws 80 in the counterclockwise CCW (one side) around the axis L via the gap G on the outer side in the radial direction. The distance between the engaging claws 80 is narrowed until they are held. Therefore, the number of engaging claws 80 can be increased as compared with the configuration shown in FIG. For example, in the configuration shown in FIG. 7, the number of engaging claws 80 was three, but in this embodiment, the number of engaging claws 80 is four. Therefore, since a large load can be applied to the second rotating member 7, the rotational speed of the second rotating member 7 can be further reduced. Even in this case, since the number of engaging claws 80 is increased, the stress applied to one engaging claw 80 can be reduced. Therefore, since the engaging claw 80 is less likely to be worn or damaged, the durability of the ratchet mechanism 4 can be improved.

For example, when a durability test was conducted on the time required for the drain valve 110 to return from the open state to the closed state by the urging force of the urging member, the results shown in FIG. 6 were obtained. FIG. 6 is a graph showing the durability test results of the ratchet mechanism 4 to which the present invention is applied. In FIG. 6, the durability test result of the ratchet mechanism 4 to which the present invention is applied is shown by the solid line A, and the durability test result of the ratchet mechanism 4x according to the reference example described with reference to FIG. 7 is shown by the solid line B. It is shown.

As can be seen from FIG. 7, in the ratchet mechanism 4 to which the present invention is applied, the drain valve 110 is changed from the open state to the closed state in both the initial stage and the durability test as compared with the ratchet mechanism 4x according to the reference example. It takes a long time to return, and a large braking force can be obtained. Further, the ratchet mechanism 4 to which the present invention is applied has a change in frictional force (change in time M until the drain valve 110 returns from the open state to the closed state) during the durability test as compared with the ratchet mechanism 4x according to the reference example. ) Was small.

Further, in the present embodiment, unlike the configuration shown in FIG. 7, the engaging claw 80 extends from the root portion 801 to the counterclockwise CCW (one side) around the axis L. Therefore, even if the outer diameter of the ratchet member 8 is not expanded, each of the plurality of engaging claws 80 has a gap in the root portion 801 of the engaging claws 80 adjacent to each other in the counterclockwise CCW (one side) around the axis L. The distance between the engaging claws 80 can be narrowed until the overlapping portion 803 is provided on the outer side in the radial direction via G. Therefore, the number of engaging claws 80 can be increased.

Further, the circumferential dimension Wa of the root portion 801 of the engaging claw 80 is larger than the radial dimension Wb of the portion located on the tip side of the root portion 801 of the engaging claw 80. Therefore, the strength of the root portion 801 of the engaging claw 80 can be increased, and the engaging claw 80 can be easily bent.

Further, the engaging claw 80 extends in an arc shape centered on a position separated from the axis L, and the curvature of the engaging claw 80 is constant in the extending direction of the engaging claw 80. Therefore, the strength of the engaging claw 80 in the circumferential direction can be increased, and the engaging claw 80 can be easily bent in the radial direction.

Further, since the engaging claw 80 extends in an arc shape centered on a position separated from the axis L , when the engaging claw 80 bends, the engaging claw 80 becomes a counterclockwise CCW. It is difficult to come into contact with the root portion 801 of the engaging claw 80 located on the side.

Further, in the present embodiment, the main body 81 is provided with an annular rib 811. Therefore, even when the support plate 33 comes into contact with the ratchet member 8 from one side L1 in the axis L direction, extra friction is unlikely to occur between the main body portion 81 and the support plate 33. Further, the outer diameter of the main body 81 is made smaller than that of the main body 81x shown in FIG. 7 for the purpose of securing a sufficient space for arranging the engaging claw 80 between the main body 81 and the peripheral wall 66. Even in this case, the strength of the main body 81 can be increased.

(Another embodiment)
In the above embodiment, the engaging claws 80 are formed at equal intervals in the circumferential direction, but the engaging claws 80 may be formed at unequal angles in the circumferential direction. For example, an embodiment in which the angular intervals of the root portions 801 of the four engaging claws 80 are 75 °, 85 °, 95 °, and 105 ° may be adopted. Even in this case, if the lengths of the engaging claws 80 are different, each of the plurality of engaging claws 80 has a gap in the root portion 801 of the adjacent engaging claws 80 in the counterclockwise CCW (one side) around the axis L. The distance between the engaging claws 80 can be narrowed until the overlapping portion 803 is provided on the outer side in the radial direction via G. Therefore, the number of engaging claws 80 can be increased. Further, since the timing at which the plurality of engaging claws 80 generate the collision sound is shifted, the loudness of the collision sound can be reduced even if the number of engaging claws 80 is increased.

(Other embodiments)
In the above embodiment, the present invention is applied to the drain valve drive device 100 and the ratchet mechanism 4 of the drain valve drive device 100, but if it is a drive device that drives a motorized member urged on one side, the drain valve drive Drive devices other than devices The present invention may be applied.

In the above embodiment, the rotation from the motor unit 1a is transmitted from the second rotating member 7 to the first rotating member 6, but the rotation from the motor unit 1a is transmitted from the first rotating member 6 to the second rotating member 6. It may be configured to be transmitted to the member 7.

In the above embodiment, the engaging claw 80 is configured on the ratchet member 8 that is separate from the second rotating member 7, but the second rotating member 7 and the ratchet member 8 are configured as an integral ratchet member. May be good.

In the above embodiment, the number of engaging claws 80 is four, but the number of engaging claws 80 may be other than four. For example, the number of engaging claws 80 may be 3, 5, or 6.

1a ... motor unit, 1b ... rotating shaft, 2 ... wheel train, 4 ... ratchet mechanism, 6 ... first rotating member, 7 ... second rotating member, 8 ... ratchet member, 10 ... crank member, 22 ... second gear, 30 ... case body, 41 ... support shaft, 63 ... engaging teeth, 66 ... peripheral wall, 80 ... engaging claws, 81 ... main body, 100 ... drain valve drive device, 110 ... drain valve, 801 ... root part, 802 ... Tip part, 803 ... Overlapping part, 806 ... Inner peripheral end face, 807 ... Outer peripheral end face, 811 ... Rib, 818 ... Long hole (joint part), L ... Axis line (rotation center axis), O ... Center

Claims (5)

A first rotating member provided with a plurality of engaging teeth on the inner peripheral surface of the peripheral wall surrounding the central axis of rotation, and
A ratchet member arranged coaxially with the first rotating member,
Have,
The ratchet member has a plurality of engagements that extend inside the peripheral wall from the main body portion and the root portion connected to the main body portion to one side around the rotation center axis, and the tip portion abuts on the engaging teeth. With claws,
Each of the plurality of engaging claws has an overlapping portion that overlaps radially outwardly with respect to the root portion of the engaging claws adjacent to each other on one side around the rotation center axis .
The ratchet mechanism is characterized in that the engaging claws extend in an arc shape centered on a position separated from the rotation center axis . It has a second rotating member coaxially arranged with the first rotating member.
The ratchet mechanism according to claim 1, wherein the ratchet member has a joint portion with the second rotating member in the main body portion. The engaging claw is a ratchet mechanism according to claim 1 or 2, characterized in that it extends to one side around the rotation center axis from said root portion. The ratchet mechanism according to any one of claims 1 to 3 , wherein the engaging claws are provided with four, five or six. Any one of claims 1 to 4 , wherein the circumferential dimension of the root portion is larger than the radial dimension of the portion of the engaging claw located on the tip side of the root portion. The ratchet mechanism described in.

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