CN111344501A

CN111344501A - Reverse input blocking clutch

Info

Publication number: CN111344501A
Application number: CN201880072645.2A
Authority: CN
Inventors: 高田声一; 小原正行
Original assignee: NTN Corp
Current assignee: NTN Corp
Priority date: 2017-11-10
Filing date: 2018-11-07
Publication date: 2020-06-26
Anticipated expiration: 2038-11-07
Also published as: WO2019093381A1; JP2019086138A; CN111344501B

Abstract

The invention provides a reverse input blocking clutch. By combining a reverse input blocking mechanism (1) and an operation control mechanism (2), if the operation control mechanism (2) is not operated, the state of preventing the rotation of the output shaft (4) can be achieved for the reverse input torque, and the operation control mechanism can be manually operated only, and the state of allowing the rotation of the output shaft (4) can be easily switched for the reverse input torque, wherein the reverse input blocking mechanism (1) transmits the rotation of the input shaft (input-side member) (3) to the output shaft in the state that an outer ring (5) arranged on the radial outer side of the output shaft (output-side member) is restricted to be non-rotatable, and locks the output shaft and the outer ring to prevent the rotation of the output shaft for the reverse input torque applied to the output shaft; the operation control means restricts the outer ring of the reverse input blocking means to be unrotatable when not operated, and releases the outer ring to be rotatable by manual operation.

Description

Reverse input blocking clutch

Technical Field

The present invention relates to a reverse input blocking clutch that transmits rotation of an input-side member to an output-side member when an input torque is applied thereto, and in which an input-side member does not rotate with respect to the reverse input torque.

Background

The reverse input blocking clutch transmits the rotation to the output-side member when the input torque is applied to the input-side member, and the input-side member does not rotate when the reverse input torque is applied to the output-side member. In the reverse input blocking clutch, there is a method of locking the output side member with respect to the reverse input torque (hereinafter, this method is referred to as "lock-up type").

In the above-described lockup-type reverse input blocking clutch, a torque transmission unit that transmits rotation of an input member to an output member is provided between the input member and the output member that rotate about the same axis, a fixed outer ring is disposed radially outward of the output member, a plurality of cam surfaces are provided on an outer peripheral surface of the output member, wedge spaces that gradually narrow in the circumferential direction are formed between an inner peripheral cylindrical surface of the outer ring and the cam surfaces of the output member, a pair of rollers and springs that press the pair of rollers into narrow portions of the wedge spaces are assembled into the respective wedge spaces, and column portions of lockup release plates that rotate integrally with the input member are inserted into both circumferential sides of the respective wedge spaces (positions that face the springs in the circumferential direction across the rollers) (see, for example, patent document 1).

According to this configuration, even when a reverse input torque is applied to the output-side member while the input-side member and the output-side member are stopped, the rollers on the rear side in the rotational direction engage with the outer ring and the output-side member, and the output-side member is locked to the outer ring, so that the rotational direction positions of the input-side member and the output-side member can be maintained.

On the other hand, when an input torque is applied to the input-side member, the column portion of the lock release piece that rotates integrally with the input-side member pushes out the roller on the rear side in the rotation direction against the elastic force of the spring toward the enlarged portion of the wedge space, whereby the engagement of the roller with the outer ring and the output-side member is released, and after the output-side member is released from the locked state, rotation is transmitted from the input-side member to the output-side member by the torque transmission means (at this time, the roller on the front side in the rotation direction relatively moves to the enlarged portion of the wedge space, and therefore does not engage with the outer ring and the output-side.

Patent document 1: japanese patent application laid-open No. 2010-281375

However, in a device incorporating a reverse input blocking clutch of the above-described configuration, when maintenance or the like is performed while an input-side member coupled to a drive source such as a motor is stopped, a worker cannot operate a driven member coupled to an output-side member of the reverse input blocking clutch from the output side, and there is a problem that workability is low.

Disclosure of Invention

Therefore, an object of the present invention is to provide a reverse input blocking clutch that is easy to switch between a state in which rotation of an output-side member is prevented and a state in which rotation of the output-side member is permitted with respect to a reverse input torque.

In order to solve the above problem, a reverse input blocking clutch according to the present invention includes: a reverse input blocking mechanism including an input-side member, an output-side member, and an outer ring disposed radially outward of the output-side member, the reverse input blocking mechanism transmitting rotation of the input-side member to the output-side member in a state in which the outer ring is restricted to be non-rotatable, and locking the output-side member and the outer ring to prevent rotation of the output-side member with respect to a reverse input torque applied to the output-side member; and an operation control means for restricting the outer ring from rotating when the outer ring is not operated, releasing the outer ring to rotate freely by manual operation, and rotating the output-side member in a state locked with the outer ring when a reverse input torque is applied to the output-side member in a state where the outer ring is released to rotate freely.

That is, when the operation control means is not operated, the rotation of the input-side member is transmitted to the output-side member by restricting the outer ring from rotating, and the rotation of the output-side member is prevented by the reverse input torque, and the operation control means is released to rotate the outer ring freely only by manual operation, and is switched to a state allowing the rotation of the output-side member for the reverse input torque.

As the reverse input blocking mechanism, the input-side member and the output-side member may be disposed so as to rotate about the same axis, a torque transmission means that transmits the rotation of the input-side member to the output-side member may be provided between the input-side member and the output-side member, a plurality of cam surfaces may be provided on an outer peripheral surface of the output-side member, wedge spaces that are gradually narrowed on both sides in the circumferential direction may be formed between an inner peripheral cylindrical surface of the outer ring and the cam surfaces of the output-side member, a pair of rollers and an elastic member that is sandwiched between the pair of rollers and presses the rollers into narrow portions of the wedge spaces may be incorporated in each wedge space, and the lock release piece having the pillar portions inserted into both sides in the circumferential direction of each wedge space may be coupled to the input-side member so as to be unable to rotate relative.

Further, the operation control means may be configured to include: a stopper plate connected to an outer peripheral side of the outer ring so as to be relatively non-rotatable, and protruding outward in a radial direction of the outer ring; a stopper plate that faces one side surface of the stopper plate, and is held so as to be axially movable and non-rotatable; a brake spring for pressing the brake plate against the stopper plate; and a brake release member for manually separating the brake plate from the stopper plate against the elastic force of the brake spring.

Further, the operation control mechanism may be specifically configured to include a fixed plate fixedly assembled at a position facing the other side surface of the stopper plate, the brake releasing member is swingably attached to the fixed plate in a state of extending radially outward from between the brake plate and the fixed plate, the brake releasing member is swung to press the brake plate to separate the brake plate from the stopper plate, or a fixing plate fixedly assembled at a position facing the other side surface of the stopper plate, the brake releasing member is held at a position radially opposed to the stopper plate on the outside in the radial direction of the gap between the brake plate and the fixed plate so as to be movable in pairs toward the center of the stopper plate, the brake releasing member is pressed between the brake plate and the fixing plate, whereby the brake plate can be separated from the stopper plate.

Here, in the specific configuration, when the operation control mechanism is configured such that a cover covering the reverse input blocking mechanism, the stopper plate, and the stopper plate is attached to the fixed plate when the brake release member is pressed into between the stopper plate and the fixed plate, and the brake release member is attached to the cover via the attachment member in a state where the attachment hole formed in the peripheral wall of the cover is closed, it is possible to prevent foreign matter from entering the reverse input blocking mechanism and the operation control mechanism, thereby improving the stability of the operation. Further, when the mounting member is formed of rubber and has a bent portion that is bent when the brake releasing member is press-fitted between the brake plate and the fixing plate, the press-fitting operation of the brake releasing member is facilitated, and when the press-fitting operation is stopped, the mounting member automatically returns to the original state by elastic recovery of the bent portion of the mounting member. Further, a steel ball or a roller may be used as the brake release member.

ADVANTAGEOUS EFFECTS OF INVENTION

The reverse input blocking clutch of the present invention is configured to combine the reverse input blocking mechanism and the operation control mechanism for controlling the operation thereof as described above, and to transmit the rotation of the input-side member due to the input torque to the output-side member if the operation control mechanism is not operated, so that the rotation of the output-side member can be prevented with respect to the reverse input torque, and the operation control mechanism can be operated only manually, and the reverse input torque can be easily switched to the state in which the rotation of the output-side member is allowed.

Therefore, in the device incorporating the reverse input blocking clutch, since the operation controller is normally configured to be in the non-operation state, it can be used in the same manner as in the case of incorporating the conventional reverse input blocking clutch, and when maintenance or the like is performed, the operator operates the operation control mechanism manually to operate the driven member coupled to the output-side member from the output side, and thus, efficient work can be performed.

Drawings

Fig. 1 is a longitudinal sectional front view of a reverse input blocking clutch of the first embodiment.

Fig. 2 is a front view of the motion control mechanism of fig. 1 in an assembled state.

Fig. 3 is a sectional view taken along the line III-III of fig. 1.

Fig. 4A is a sectional view taken along line IV-IV of fig. 1.

Fig. 4B is an enlarged sectional view of a main portion of fig. 4A.

Fig. 5A is a cross-sectional view for explaining an operation for the input torque in correspondence with fig. 4B.

Fig. 5B is a cross-sectional view for explaining an operation for the input torque corresponding to fig. 4B.

Fig. 6 is a front view corresponding to fig. 2 showing a state in which the operation control mechanism is manually operated.

Fig. 7 is a cross-sectional view for explaining the operation for the reverse input torque after the operation control mechanism is manually operated, corresponding to fig. 4B.

Fig. 8 is a longitudinal sectional front view of the reverse input blocking clutch of the second embodiment.

Fig. 9 is a sectional view taken along line IX-IX of fig. 8.

Fig. 10 is a plan view of a main portion of fig. 8.

Fig. 11 is a vertical cross-sectional front view corresponding to fig. 8 showing a state in which the operation control mechanism is manually operated.

Fig. 12 is a vertical cross-sectional front view showing a first modification corresponding to fig. 8.

Fig. 13A is a vertical cross-sectional front view showing a second modification corresponding to fig. 8.

Fig. 13B is a vertical sectional front view showing a state in which the operation control mechanism of fig. 13A is manually operated.

Fig. 14A is a vertical cross-sectional front view showing a third modification corresponding to fig. 8.

Fig. 14B is a plan view except for a pressing portion of the mounting member of fig. 14A.

Detailed Description

Hereinafter, embodiments of the present invention will be described with reference to the drawings. Fig. 1 to 7 show a first embodiment. As shown in fig. 1 and 2, the reverse input blocking clutch includes a reverse input blocking mechanism 1 and an operation control mechanism 2 that controls the operation of the reverse input blocking mechanism 1, and a motor (not shown) is connected to an input side member of the reverse input blocking mechanism 1, and a driven member (not shown) that is operated by the driving of the motor is connected to an output side member.

As shown in fig. 1 and 3, the reverse input blocking mechanism 1 includes an input shaft (input-side member) 3, an output shaft (output-side member) 4, a two-stage cylindrical outer ring 5 disposed radially outward of the output shaft 4, a lock release piece 6 having a plurality of column portions 6a inserted into a radial gap between an input-side end portion of the output shaft 4 and a large-diameter portion of the outer ring 5, a roller 7 assembled into a radial gap between an input-side end portion of the output shaft 4 and a large-diameter portion of the outer ring 5, and a coil spring (elastic member) 8. Further, the coil spring may be replaced with another elastic member such as a plate spring.

The input shaft 3 is rotated about the same axis as the output shaft 4 by inserting an engagement portion 3a having a width across the opposite sides formed on the outer periphery of the input shaft 3 into an engagement hole 4a provided in an input-side end surface of the output shaft 4, and slidably fitting a small-diameter cylindrical portion protruding from an end surface of the engagement portion 3a into a circular hole provided in the bottom of the engagement hole 4a of the output shaft 4.

Here, as shown in fig. 4A and 4B, the engagement hole 4A of the output shaft 4 is formed so that a slight gap in the rotational direction is generated when the input shaft 3 is inserted, thereby constituting a torque transmission means for transmitting the rotation of the input shaft 3 to the output shaft 4 with a slight angular delay. A plurality of cam surfaces 4b are provided in the circumferential direction on the outer periphery of the input-side end portion of the output shaft 4, and wedge-shaped spaces 9 that become gradually narrower on both sides in the circumferential direction are formed between the inner peripheral cylindrical surface of the large diameter portion of the outer race 5 and the respective cam surfaces 4b of the output shaft 4. The rollers 7 are assembled into the wedge-shaped spaces 9 one by one, and the coil spring 8 is assembled so as to be sandwiched between a pair of the rollers 7 and press-fit the rollers 7 into the narrow portion of the wedge-shaped space 9.

As shown in fig. 3, 4A, and 4B, the column portion 6a of the lock release piece 6 is inserted into both sides (positions facing the coil spring 8 in the circumferential direction with the roller 7 interposed therebetween) in the circumferential direction of each wedge space 9, and the lock release piece 6 is fitted into the outer periphery of the engagement portion 3a of the input shaft 3 without any gap and rotates integrally with the input shaft 3.

The outer ring 5 has a plurality of axially extending projections on the outer peripheral surface of the large diameter portion, and is connected to the operation control mechanism 2 by the respective projections as will be described later. Further, between the large diameter portion of the outer ring 5 and the lock release piece 6 and between the small diameter portion of the outer ring 5 and the central portion of the output shaft 4, sintered oil-impregnated

bearings

10a and 10b are respectively assembled.

Since the rollers 7 of the reverse input blocking mechanism 1 are pressed into the narrow portion of the wedge space 9 by the elastic force of the coil springs 8, even when a reverse input torque is applied to the output shaft 4 in a state where the outer race 5 is restricted as described later, the rollers 7 on the rear side in the rotation direction engage with the outer race 5 and the output shaft 4, and the output shaft 4 is locked to the outer race 5 and does not rotate.

When an input torque is applied to the input shaft 3 in a state in which the outer race 5 is restricted, first, as shown in fig. 5A, as the input shaft 3 rotates, the column portion 6a of the lock release piece 6 integrated with the input shaft 3 pushes the roller 7 on the rear side in the rotation direction against the elastic force of the coil spring 8 toward the enlarged portion of the wedge space 9, and thereby the engagement of the roller 7 with the outer race 5 and the output shaft 4 is released, and the output shaft 4 is released from the locked state. Then, as shown in fig. 5B, when the input shaft 3 further rotates and the engagement portion 3a of the input shaft 3 engages with the engagement hole 4a of the output shaft 4, the rotation of the input shaft 3 is transmitted to the output shaft 4 (at this time, the rollers 7 on the front side in the rotation direction move relatively to the enlarged portion of the wedge space 9, and therefore do not engage with the outer race 5 and the output shaft 4).

On the other hand, as shown in fig. 1 and 2, the operation control means 2 includes: a brake cylinder 11 coupled to an outer peripheral side of the outer ring 5 of the reverse input blocking mechanism 1; a stopper plate 12 connected to an outer peripheral side of the brake cylinder 11 and extending outward in a radial direction of the outer ring 5; a brake plate 13 facing one side surface (output side surface) of the brake plate 12; a fixed plate 14 fixed to an external member a such as a case in a state of facing the other side surface (input side surface) of the stopper plate 12; a plurality of brake springs 15 for pressing the brake plate 13 against the brake plate 12; a spring receiving plate 16 facing one side surface of the brake plate 13 with each brake spring 15 interposed therebetween; and a brake releasing member 17 for separating the brake plate 13 from the stopper plate 12 against the elastic force of the brake spring 15 by a manual operation described later. Although a coil spring is used for the brake spring 15, another elastic member may be used.

A plurality of axial grooves are formed in the inner circumferential surface and the outer circumferential surface of the brake cylinder 11, and the projections on the outer circumference of the outer ring 5 are fitted into the respective axial grooves on the inner circumference of the brake cylinder 11, and the projections on the inner circumference of the stopper plate 12 are fitted into the respective axial grooves on the outer circumference, whereby the brake cylinder 11 is coupled to the outer ring 5 and the stopper plate 12 so as not to be rotatable relative to each other (see fig. 3, 4A, and 4B). That is, the stopper plate 12 is connected to the outer periphery side of the outer ring 5 via the brake cylinder 11 so as not to be relatively rotatable.

The brake plate 13 is slidably fitted to the outer periphery of the output side portion of the brake cylinder 11, and is held so as to be axially movable and non-rotatable by passing a plurality of bolts 18 screwed into one side surface of the fixed plate 14. The bolt 18 also passes through each brake spring 15 and the spring receiving plate 16, and each brake spring 15 has one end supported by the spring receiving plate 16 and the other end pressing the brake plate 13.

The fixed plate 14 is composed of a main body portion having a slightly small circular outer periphery and disposed radially outward of the input side portion of the brake cylinder 11, and a large-diameter circular plate portion continuous with the input side of the main body portion, and is fastened and fixed to the outer member a by a plurality of attachment pieces 14a extending radially outward from the outer periphery of the large-diameter circular plate portion. Further, a pair of straight portions on the outer periphery of the main body portion are provided with support shafts 14b (see fig. 3) that protrude in a direction parallel to the radial direction and support the brake release member 17 as described later.

As shown in fig. 2, 3, and 4A, the brake releasing member 17 is a substantially inverted Y-shaped member, and includes a rod portion 17a extending radially outward from between the brake plate 13 and the main body portion of the fixed plate 14, and a pair of leg portions 17b bifurcated from a lower end of the rod portion 17a and disposed radially outward of the brake plate 12. The mounting portions 17c provided at the lower ends of the respective leg portions 17b are swingably mounted to the support shafts 14b of the fixed plate 14.

Further, a projection 17d facing the other side surface of the brake disk 13 is provided in the vicinity of the mounting portion 17c of each leg portion 17b of the brake releasing member 17. The two protrusions 17d are disposed at positions facing each other with the axis of the input shaft 3 interposed therebetween, and when the brake releasing member 17 is swung to the output side, the brake plate 13 can be pressed with good balance. Further, a notch 17e for avoiding interference with the bolt 18 screwed into the fixed plate 14 is provided on the inner periphery of each leg portion 17b and the boundary portion between the two leg portions 17 b.

Therefore, since the brake release member 17 is not operated during normal use, the brake spring 15 presses the brake plate 13 against the stopper plate 12, and the stopper plate 12 is pressed against the fixed plate 14. When the lever portion 17a of the brake releasing member 17 is manually operated to swing the entire brake releasing member 17 to the output side about the support shaft 14b of the fixed plate 14 as shown in fig. 6, the two protrusions 17d on one side surface of the brake releasing member 17 press the brake plate 13 to move the brake plate 13 in the axial direction against the elastic force of the brake spring 15, and the brake plate 13 is separated from the brake plate 12. That is, in normal use, the check plate 12 and the outer ring 5 of the reverse input blocking mechanism 1 connected thereto are restricted from rotating, and the check plate 12, the brake cylinder 11, and the outer ring 5 are released from rotating by manual operation of the brake release member 17.

The reverse input blocking clutch is configured by combining a reverse input blocking mechanism 1 and an operation control mechanism 2, wherein the reverse input blocking mechanism 1 transmits the rotation of the input shaft 3 by the input torque to the output shaft 4 in a state where the outer ring 5 is restricted from rotating, and locks the output shaft 4 and the outer ring 5 to prevent the rotation of the output shaft 4 with respect to the reverse input torque applied to the output shaft 4; the operation control means 2 restricts the outer ring 5 of the reverse input blocking means 1 from rotating when not operated, and releases the outer ring 5 to be rotatable by manual operation.

That is, since the outer race 5 of the reverse input blocking mechanism 1 is restricted during normal use (during non-operation of the operation control mechanism 2), a state is achieved in which the same function as that of the conventional reverse input blocking clutch can be obtained, and if the outer race 5 is released to be rotatable by manually operating the brake release member 17 of the operation control mechanism 2, when a reverse input torque is applied to the output shaft 4, as shown in fig. 7, the output shaft 4 rotates integrally with the brake cylinder 11 and the braking plate 12 in a state locked with the outer race 5 (a state is achieved in which rotation of the output shaft 4 is permitted with respect to the reverse input torque).

Therefore, in the device incorporating this reverse input blocking clutch, since the operation control mechanism 2 is normally in the non-operation state, as in the case of incorporating the conventional reverse input blocking clutch, the driven member coupled to the output shaft 4 can be operated by driving the motor coupled to the input shaft 3, the rotational direction position of the driven member can be maintained when the motor is stopped, and the operator can operate the driven member from the output side by manually operating the operation control mechanism 2 for maintenance or the like, and thus the operation can be performed efficiently.

Fig. 8 to 11 show a second embodiment. In this embodiment, an operation control mechanism 19 having a configuration different from that of a part of the operation control mechanism 2 of the first embodiment is incorporated in place of the operation control mechanism 2 of the first embodiment, and the reverse input blocking mechanism 1 has the same configuration as that of the first embodiment.

The operation control mechanism 19 of the second embodiment is different from the first embodiment in that, as shown in fig. 8 and 9, a brake release member 22 made of a steel ball is attached to a cover 20 attached to a fixed plate 14 via a rubber attachment member 21. In addition, accompanying this, the fixing plate 14 is formed in a two-stage cylindrical shape in which the support shaft 14b that supports the brake release member 17 of the first embodiment is not provided on the outer periphery of the main body portion.

Since the cover 20 is cylindrical and covers the stopper plate 12, the stopper plate 13, the stopper spring 15, the spring receiving plate 16, and the bolt 18 of the reverse input blocking mechanism 1 and the operation control mechanism 19, a lid portion 20a through which the output shaft 4 passes is provided at one end, and the peripheral portion of the opening at the other end is fitted and fixed to the large-diameter outer peripheral surface of the body portion of the fixed plate 14. A pair of circular mounting holes 20b are opened in the circumferential wall at positions facing each other in the radial direction with the stopper plate 12 interposed therebetween, and the mounting holes 20b are closed by mounting members 21 (see fig. 10).

As shown in fig. 8 to 10, the attachment member 21 includes an annular attachment portion 21a attached to the outer surface of the peripheral portion of the attachment hole 20b of the cover 20, a pressing portion 21b arranged radially outward of the attachment hole 20b and having a circular shape in plan view, and a curved portion 21c connecting the inner peripheral portion of the attachment portion 21a and the outer peripheral portion of the pressing portion 21b and curved when the pressing portion 21b is pressed, and a brake release member (steel ball) 22 is attached to the back surface side of the pressing portion 21 b. Thus, the brake release member 22 is held at a position radially outward of the gap between the brake plate 13 and the fixed plate 14 and radially opposite to each other across the stopper plate 12 so as to be movable in pairs toward the center of the stopper plate 12.

As shown in fig. 11, the brake plate 13 can be separated from the brake plate 12 by pressing the pressing portion 21b of the attachment member 21 in the direction of the solid arrow to bend the bent portion 21c of the attachment member 21 so that a part of the bent portion enters the inside of the attachment hole 20b of the cover 20 and pressing the brake release member 22 into between the brake plate 13 and the fixed plate 14, and when the pressing of the pressing portion 21b is stopped, the bent portion 21c of the attachment member 21 returns to the original shape as shown by the one-dot chain line in fig. 11 and the brake release member 22 also returns to the original position.

Therefore, in the second embodiment, even when the operation control mechanism 19 is not manually operated, the outer ring 5 of the reverse input blocking mechanism 1 is restricted from rotating, and the same function as that of the conventional reverse input blocking clutch can be obtained, and when the operation control mechanism 19 is manually operated (when the brake release member 22 is pressed into between the brake plate 13 and the fixed plate 14), the outer ring 5 of the reverse input blocking mechanism 1 is released from rotating freely, and the reverse input torque is in a state of allowing rotation of the output shaft 4, and the operator operates the driven member coupled to the output shaft 4 from the output side.

In the second embodiment, unlike the first embodiment, the stopper plate 12 and the stopper plate 13 of the reverse input blocking mechanism 1 and the operation control mechanism 19 are covered with the cover 20, and the brake release member 22 is attached to the cover 20 via the attachment member 21 in a state where the attachment hole 20b opened in the peripheral wall of the cover 20 is closed, so that it is possible to prevent foreign matter from entering the reverse input blocking mechanism 1 and the operation control mechanism 19, and to improve the stability of the operation compared to the first embodiment.

Further, since the entire attachment member 21 of the operation control mechanism 19 is formed of rubber and has the bent portion 21c that is bent when the brake releasing member 22 is pushed into between the brake plate 13 and the fixed plate 14, the pushing operation of the brake releasing member 22 can be easily performed, and when the pushing operation is stopped, the elastic recovery of the bent portion 21c of the attachment member 21 automatically returns to the original state, and therefore, even when the switching between the state in which the rotation of the output shaft 4 is prevented and the state in which the rotation of the output shaft 4 is permitted is repeated, the switching operation is not troublesome.

Further, in the structure, compared to the first embodiment in which the brake release member 17 of the operation control mechanism 2 is extended to the outside in the radial direction, there is little risk of interference with external members when the device is assembled, and the mounting member 21 integrated with the brake release member 22 in the operation control mechanism 19 can be mounted to the cover 20 before or after the assembly of the entire clutch other than this, which is advantageous in that the assembly work can be efficiently performed.

Fig. 12 to 14B show modifications to the examples of fig. 8 to 11, respectively. First, in a first modification shown in fig. 12, an inner peripheral portion of a flexible check plate 12 is screwed to an end surface of a brake cylinder 11 formed integrally with an outer ring 5. In this modification, during normal use, the stopper plate 12 is sandwiched between the brake plate 13 and the fixed plate 14 in a bent state, and when the brake releasing member 22 is pressed between the brake plate 13 and the fixed plate 14, the brake plate 13 moves in the axial direction, the stopper plate 12 elastically returns to be separated from the brake plate 13 and the fixed plate 14, and the brake cylinder 11 and the outer ring 5 are released to be rotatable together with the stopper plate 12 more reliably.

In the second modification shown in fig. 13A, the mounting portion 21a of the mounting member 21 is formed in a radially enlarged state, and the coil spring 23 through which the brake release member 22 can pass is disposed between the bent portion 21c of the mounting member 21 and the peripheral portion of the mounting hole 20b of the cover 20. In this modification, as shown in fig. 13B, when the brake releasing member 22 is pushed between the brake plate 13 and the fixed plate 14 by pressing the pressing portion 21B of the mounting member 21, the coil spring 23 is compressed in accordance with the bending of the bent portion 21c of the mounting member 21, and when the pressing of the pressing portion 21B is stopped, the brake releasing member 22 is more reliably returned to the original position by the elastic restoring force of both the bent portion 21c and the coil spring 23.

In the third modification shown in fig. 14A and 14B, a roller is used as the brake release member 22' instead of the brake release member 22 of the steel ball. In addition, the brake release member may be wedge-shaped, or the like, in addition to the steel balls or rollers.

The embodiments disclosed herein should be considered as examples in all respects, and not as limitations. The scope of the present invention is defined not by the above description but by the claims, and is intended to include meanings equivalent to the claims and all modifications within the scope thereof.

For example, in the first embodiment, a flexible stopper plate 12 may be fixed to a brake cylinder 11 formed integrally with the outer ring 5, as in the first modification of the second embodiment. In each embodiment, the brake cylinder 11 and the stopper plate 12 may be formed integrally.

Description of reference numerals:

1 … reverse input blocking mechanism; 2 … motion control mechanism; 3 … input shaft (input side member); 4 … output shaft (output side member); 4b … cam surface; 5 … outer ring; 6 … unlocking piece; 6a … pillar; 7 … roller; 8 … coil spring (elastic member); 9 … wedge-shaped space; 11 … brake cylinder; 12 … stop plate; 13 … braking plate; 14 … fixing the board; 15 … brake spring; 16 … spring receiving plate; 17 … brake release member; 19 … motion control means; 20 … cover; 20b … mounting holes; 21 … mounting components; 21c … bend; 22 … brake release member (steel ball); 22' … brake release member (roller); 23 … coil spring.

Claims

1. A reverse input blocking clutch is provided with:

a reverse input blocking mechanism including an input-side member, an output-side member, and an outer ring disposed radially outward of the output-side member, the reverse input blocking mechanism transmitting rotation of the input-side member to the output-side member in a state in which the outer ring is restricted to be non-rotatable, and locking the output-side member and the outer ring to prevent rotation of the output-side member with respect to a reverse input torque applied to the output-side member; and

an operation control means for restricting the outer ring from rotating when the outer ring is not operated and releasing the outer ring from rotating by manual operation,

when a reverse input torque is applied to the output-side member in a state where the outer ring is released to be rotatable, the output-side member rotates in a state where it is locked with the outer ring,

the reverse input blocking clutch is characterized in that,

the operation control mechanism includes:

a stopper plate connected to an outer peripheral side of the outer ring so as to be non-rotatable relative thereto, and protruding outward in a radial direction of the outer ring;

a stopper plate that faces one side surface of the stopper plate, and is held so as to be axially movable and non-rotatable;

a brake spring that presses the brake plate against the stopper plate;

a brake release member that separates the brake plate from the stopper plate against an elastic force of a brake spring by a manual operation; and

a fixed plate fixedly assembled at a position facing the other side surface of the stopper plate,

the brake releasing member is swingably attached to the fixed plate in a state of extending radially outward from between the brake plate and the fixed plate,

the brake releasing member is swung to press the brake plate, thereby separating the brake plate from the stopper plate.

2. A reverse input blocking clutch is provided with:

the reverse input blocking clutch is characterized in that,

the operation control mechanism includes:

a brake spring that presses the brake plate against the stopper plate;

the brake release member is held at a position radially opposed to the stopper plate on the outside in the radial direction of the gap between the brake plate and the fixed plate so as to be movable in pairs toward the center of the stopper plate,

the brake releasing member is pressed between the brake plate and the fixing plate, thereby separating the brake plate from the stopper plate.

3. The reverse input blocking clutch according to claim 2,

a cover covering the reverse input blocking mechanism, the braking plate and the braking plate is arranged on the fixed plate,

the brake release member is attached to the cover via an attachment member in a state where the attachment hole provided in the circumferential wall of the cover is closed.

4. The reverse input blocking clutch of claim 3,

the mounting member is formed of rubber and has a bent portion that is bent when the brake releasing member is pressed between the brake plate and the fixing plate.

5. The reverse input blocking clutch according to any one of claims 2 to 4,

the brake release member is a steel ball or a roller.

6. The reverse input blocking clutch according to any one of claims 1 to 5,

the reverse input blocking mechanism is disposed in a state where the input-side member and the output-side member rotate about the same axis,

a torque transmission means for transmitting rotation of the input-side member to the output-side member is provided between the input-side member and the output-side member,

a plurality of cam surfaces are provided on the outer peripheral surface of the output-side member,

a wedge-shaped space that becomes gradually narrower on both sides in the circumferential direction is formed between the inner circumferential cylindrical surface of the outer ring and each cam surface of the output-side member,

a pair of rollers and an elastic member sandwiched between the pair of rollers and pressing each roller into a narrow part of the wedge-shaped space are assembled in each wedge-shaped space,

the input-side member is coupled to the lock release piece so as not to be rotatable relative thereto, and the lock release piece has column portions inserted into the wedge spaces on both circumferential sides thereof.