TWI646272B - Reverse input cutoff clutch - Google Patents

Abstract

An object of the present invention is to provide a reverse input cut-off clutch including an outer ring impregnated with a rust preventive oil formed of a sintered member, which can suppress a rise in frictional resistance with an increase in operating time.

The reverse input cut-off clutch includes: an input shaft 12 for inputting a rotational force, an output shaft 13 for outputting a rotational force, and an outer ring 14 made of a sintered member. The outer ring 14 is impregnated with resin in the pores of the sintered member. Then, it is formed by impregnating the oil with rust preventive oil. In the reverse input cut-off clutch, a transmission mechanism is housed, and the input shaft 12 is given a rotational force to allow rotation of the output shaft 13, and the output shaft 13 is given a rotational force to prevent rotation of the input shaft 12.

Description

Reverse input cut-off clutch

The present invention relates to a reverse input cut-off clutch. Although the rotational force from both directions of the input side can be transmitted to the output side, the rotational force from the output side cannot be transmitted to the input side.

The reverse input cut-off clutch transmits the driving force from the input side in both directions to the output side, but prevents transmission of the rotational force from the output side to the input side (see, for example, Patent Document 1).

FIG. 5 is an external configuration diagram showing an example of a conventional reverse input blocking clutch 11. The reverse input cut-off clutch 11 transmits the rotational force in the forward direction and the reverse direction input to the input shaft 12 to the output shaft 13 and the rotational force in both directions from the input shaft 12 to the output shaft 13 but The rotational force from the output shaft 13 is not transmitted to the input shaft 12. In the outer ring 14, a transmission mechanism section for achieving this function is accommodated. In the transmission function, the input shaft 12 is given a rotational force to permit rotation of the output shaft 13, and the output shaft 13 is given a rotational force to prevent rotation of the input shaft 12. A cover portion 15 is provided on the input shaft 12 of the outer ring 14, and a side wall portion 16 is formed on the output shaft 13 side of the outer ring 14. Generally, the outer ring 14 is formed by a sintered member, and the sintered member is porous (porous), and there are numerous pores on the surface. To improve the rust prevention effect, the pores are rust-proofed by vacuum immersion in oil. Oil impregnated with oil.

[Prior technical literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open No. 2007-32634

However, I have found that the pores of the sintered component are impregnated with a considerable amount of rust preventive oil, so after using the reverse input to cut off the clutch in a high speed and high temperature environment, the rust preventive oil inside the pores will be excessive and leak out to the internal surface. When the running time of the reverse input cut-off clutch increases, the phenomenon of mixing with friction powder caused by wear will occur. In addition, if the mixing amount of the rust preventive oil and the friction powder is more than a certain amount, these will form an adhesive substance. The sticky substance causes the frictional resistance of the reverse input blocking clutch, that is, the friction loss when transmitting power from the input shaft to the output shaft increases, hindering the function of the reverse input blocking clutch.

An object of the present invention is to provide a reverse input cut-off clutch which can suppress an increase in frictional resistance of a reverse input cut-off clutch having an outer ring impregnated with rust preventive oil formed of a sintered member.

The reverse input cut-off clutch of the present invention includes: an input shaft to input a rotational force; an output shaft to output a rotational force; and a transmission mechanism portion that allows rotation of the output shaft when the input shaft is given a rotational force, and the output shaft is provided with a rotational force. That is to prevent rotation of the input shaft; and The outer ring is formed by impregnating a resin with fine pores inside the sintered member, and impregnated with oil of rust preventive oil, and houses the transmission mechanism portion.

According to the present invention, after the outer ring is impregnated with resin from the sintered member, the oil impregnation of the rust preventive oil is performed, so the oil content of the outer ring can be within a certain range. As a result, excess rust preventive oil inside the pores can be prevented from leaking to the surface of the outer ring. Therefore, it is possible to suppress the sticky substance mixed with rust preventive oil and friction powder, and to suppress the increase in frictional resistance when the power transmission of the clutch is reversed by the reverse input. . And the anti-rust oil stays near the surface of the outer ring, so it can also maintain the anti-rust effect.

11‧‧‧Reverse input cut-off clutch

12‧‧‧ input shaft

12A‧‧‧Input component

13‧‧‧ output shaft

13A‧‧‧Output component

12B‧‧‧Input engagement section

13B‧‧‧Output engagement section

14‧‧‧ outer ring

14A‧‧‧Inner wall surface

15‧‧‧ cover

16‧‧‧ sidewall

17‧‧‧Rotating member

18‧‧‧ Sintered components

19‧‧‧ fine hole

20‧‧‧ resin

21‧‧‧Gap

22‧‧‧Anti-rust oil

[Fig. 1] (a) to (c) are structural diagrams of a reverse input cut-off clutch according to an embodiment of the present invention.

[Fig. 2] (a) to (c) are operation explanatory diagrams of a reverse input cut-off clutch according to an embodiment of the present invention.

[Fig. 3] (a) to (c) are explanatory diagrams of impregnation of resin and impregnation of rust preventive oil with respect to the sintered member of the outer ring of the embodiment of the present invention.

[Fig. 4] A graph showing the relationship between the change in friction resistance after a predetermined endurance test of the reverse input cut-off clutch and the use atmosphere temperature.

[Fig. 5] Fig. 5 is an external configuration diagram showing an example of a conventional reverse input cut-off clutch.

Hereinafter, embodiments of the present invention will be described. FIG. 1 is an explanatory diagram showing an example of a reverse input cut-off clutch 11 according to an embodiment of the present invention, FIG. 1 (a) is a structural diagram, FIG. 1 (b) is a perspective view of an input shaft 12, and FIG. 1 (c) is a A perspective view of the output shaft 13. The upper half is shown in a sectional view in FIG. 1 (a).

The reverse input cut-off clutch 11 transmits the rotational force (power) in the forward direction and the reverse direction input to the input shaft 12 to the output shaft 13, although the rotational force in both directions from the input shaft 12 is transmitted to the output shaft 13. , But does not transmit the rotational force from the output shaft 13 to the input shaft 12. In the outer ring 14, a transmission mechanism portion for achieving this function is housed. A cover portion 15 is provided on the input shaft 12 of the outer ring 14, and a side wall portion 16 is formed on the output shaft 13 side of the outer ring 14. The transmission mechanism includes an input member 12A that engages the input shaft 12, an output member 13A provided on the output shaft 13, and a rotating member 17 that abuts the inner surface of the outer ring 14.

As shown in FIG. 1 (b), the input shaft 12 is combined with an input member 12A, and here, the input member 12A is provided with a plurality of input engaging portions 12B. As shown in FIG. 1 (c), the output shaft 13 includes an output member 13A, and a plurality of output engagement portions 13B are provided in the output member 13A. In the input shaft 12 and the output shaft 13, a plurality of input engaging portions 12B and a plurality of output engaging portions 13B are fitted into each other alternately, and the flat portion of the input member 12A and the flat portion of the output member 13A are in contact with each other in a flat surface. .

FIG. 2 is an operation explanatory diagram of the reverse input cut-off clutch 11 according to the embodiment of the present invention. FIG. 2 (a) is an explanatory diagram of the positional relationship of the rotating member 17, the input engaging portion 12B, and the output engaging portion 13B in a stationary state where neither the input shaft 12 nor the output shaft 13 is rotated, FIG. 2 ( b) is an explanatory diagram of the positional relationship between the rotating member 17, the input engaging portion 12B, and the output engaging portion 13B when the counterclockwise rotational force is applied to the output shaft 13, FIG. 2 (c), When the shaft 12 applies a counterclockwise rotational force, the positional relationship of the rotating member 17, the input engagement portion 12B, and the output engagement portion 13B is illustrated.

As shown in FIG. 2 (a), when the input shaft 12 and the output shaft 13 are in a stationary state where no rotational force is applied, the rotating member 17 is located at approximately the center of the output engagement portion 13B. And the rotating member 17 is kept at a very small distance to oppose the output engaging portion 13B, and the rotating member 17 is kept at a very small interval to be opposed to the inner wall surface 14A of the outer ring 14.

Now, if a counterclockwise rotation force is applied to the output shaft 13 from the stationary state in FIG. 2 (a), as shown in FIG. 2 (b), the rotation force is applied to the output engagement portion 13B in the direction of the left arrow to output the card. The joint portion 13B moves in the direction of the left arrow. The output engaging portion 13B operates independently and smoothly in a certain rotation range (the interval between the adjacent input engaging portions 12B), so the input engaging portion 12B does not operate. Therefore, as the output engaging portion 13B moves in the direction of the left arrow, the rotating member 17 is raised upward from the output engaging portion 13B. As a result, the gap between the output engaging portion 13B and the inner wall surface 14A of the outer ring 14 becomes narrow, and the rotating member 17 is locked between the output engaging portion 13B and the inner wall surface 14A of the outer ring 14 to be locked. In this way, the rotational force applied to the output shaft 13 is prevented and cannot be transmitted to the input shaft 12.

On the other hand, if a counterclockwise rotation force is applied to the input shaft 12 from the stationary state in FIG. 2 (a), as shown in FIG. 2 (c), the input engaging portion 12B is turned in the direction of the left arrow. First, input The side surface of the engaging portion 12B abuts the side surface of the output engaging portion 13B or the side surface of the rotating member 17. And after the input engaging portion 12B is turned in the direction of the left arrow, the side of the input engaging portion 12B, that is, both sides of the input engaging portion 13B and the side of the rotating member 17, abut the input engaging portion 12B without the rotating member 17 being snapped in. Between the output engaging portion 13B and the inner wall surface 14A of the outer ring 14, the output engaging portion 13B and the rotating member 17 are pushed out in the direction of the left arrow. That is, when the input shaft 12 rotates in the counterclockwise direction, the output shaft 13 rotates together with the input shaft 12 and transmits the rotational force applied to the input shaft 12 to the output shaft 13. When the input shaft 12 rotates clockwise, only the direction is different, and the input engaging portion 12B also abuts the output engaging portion 13B and the rotating member 17. Similarly, the output shaft 13 rotates together with the input shaft 12 and will rotate the input shaft 12. The applied rotational force is transmitted to the output shaft 13.

The outer ring 14 accommodating such a conveying mechanism is formed by a sintered member. In addition, the outer ring 14 is formed by impregnating pores inside the sintered member with resin, and then impregnating the rust preventive oil with oil. The resin is impregnated under vacuum (vacuum impregnation), and the antirust oil is impregnated under vacuum (vacuum impregnation).

FIG. 3 is an explanatory diagram for the impregnation of the resin with the sintered member 18 of the outer ring and the impregnation of the rust preventive oil. As shown in FIG. 3 (a), there are fine holes 19 in the sintered member 18 of the outer ring 14. As shown in FIG. 3 (b), in these fine holes 19, first, the resin 20 is impregnated. The impregnation amount of the resin 20 is less than the amount by which these pores 19 are completely closed. The voids 21 which are impregnated to the minimum required for maintaining the rust-preventive effect of the outer ring 14 are left. Next, as shown in FIG. 3 (c), oil impregnation of the rust preventive oil 22 is performed in the gap 21. Thereby, the rust preventive oil 22 can stay near the surface of the outer ring 14 and maintain the rust preventive effect.

In this way, the resin 20 is impregnated into the pores 19 to reduce the voids of the pores 19, and the remaining pores 21 are impregnated with the oil of the rust preventive oil 22. Therefore, the amount of the rust preventive oil 22 can be reduced and becomes appropriate. Thereby, it is possible to prevent the rust preventive oil 22 inside the pores 19 from being excessively exuding to the surface of the outer ring 14. That is, even if the running time of the reverse input cut-off clutch is increased, it is possible to suppress the sticky substance mixed with the rust preventive oil 22 and the friction powder of the outer ring 14 and suppress the sticky substance that increases the friction resistance of the reverse input cut-off clutch. Moreover, an appropriate amount of the rust preventive oil 22 stays near the surface of the outer ring, so the rust preventive effect can also be maintained.

Figure 4 is a graph showing the friction resistance (braking torque acting when the input shaft rotates) changes after a durability test in which the reverse input cut-off clutch is operated for a predetermined period of time. In FIG. 4, the black dots are data of a conventional reverse input cut-off clutch (only those who are impregnated with rust-proof oil), and × are data of the reverse input cut-off clutch according to the embodiment of the present invention. It can be seen that, in the conventional reverse input cut-off clutch, after the endurance test, the magnitude of the friction resistance increases together, and the increase proportion increases with As the ambient temperature increases, it increases. For example, at 60 ° C, the variation ratio of braking torque is 50% to 70%, and at 80 ° C, it becomes 105% to 130%.

On the other hand, in the reverse input cut-off clutch according to the embodiment of the present invention, the variation ratio of the braking torque is less than 10% at 60 ° C. Compared with the conventional one, the variation ratio of the braking torque is affected by the sticky substance formed by the mixing of rust preventive oil and friction powder. According to the embodiment of the present invention, the change ratio of the reverse input cut-off clutch is smaller because of less sticky substance.

Although the embodiment of the present invention has been described above, this embodiment is provided as an example, and I have not attempted to limit the scope of the invention. This novel embodiment can be implemented in various other forms, and various omissions, substitutions, and changes can be made without departing from the spirit of the invention. This embodiment or its modification is included in the scope or gist of the invention, and is included in the invention described in the scope of the patent application and its equivalent scope.

Claims (2)

A reverse input cut-off clutch includes: an input shaft for inputting a rotational force; an output shaft for outputting a rotational force; an output engaging portion is provided; a transmission mechanism portion configured with a rotating member; and when the input shaft is given a rotational force, the output shaft is permitted Rotation of the input shaft while preventing rotation of the input shaft; and an outer ring that houses the transmission mechanism; the reverse input cut-off clutch is constructed as follows: When the output shaft is given rotational force , The rotating member will be buckled between the output engaging portion and the outer ring; the outer ring is made by impregnating the resin with a gap in the inner pores of the sintered member, and preventing the gap in the inner pores Rust oil is formed by impregnation with oil. The reverse input cut-off clutch according to claim 1, wherein the internal pores of the sintered member of the outer ring are impregnated with resin in a vacuum state and impregnated with rust preventive oil.